实验报告英文
实验报告模板英文
Title:[Experiment Title]Student Name:[Your Full Name]Student ID:[Your Student ID]Course Name:[Course Name]Course Number:[Course Number]Date of Experiment:[Date of Experiment]Introduction:[Provide a brief background on the experiment. Explain the purpose, the significance of the study, and any relevant theories or concepts that will be tested.]Objective:[State the specific objectives of the experiment. What do you aim to achieve or find out?]Materials and Methods:[Describe the materials used and the methods employed in the experiment. Include details such as the following:]1. Materials:- List all the equipment, chemicals, samples, or other materials used in the experiment.- Provide descriptions of any specialized equipment or apparatus used, including specifications.2. Apparatus:- Describe the setup of the experiment, including the arrangement of equipment and the sequence of operations.3. Procedures:- Outline the step-by-step procedures followed during the experiment.- Include any safety precautions or measures taken.4. Data Collection:- Explain how data was collected during the experiment.- Include details on measurements, observations, and any other data points recorded.5. Variables:- Identify the independent and dependent variables in the experiment.- Describe how the variables were controlled or manipulated.Results:[Present the data collected during the experiment. Include tables, graphs, and figures as appropriate. Discuss the following:]1. Raw Data:- Present the raw data in tables or figures.- Include all relevant measurements, observations, and calculations.2. Analysis:- Analyze the data collected.- Discuss any patterns, trends, or relationships observed.3. Discussion of Results:- Interpret the results in the context of the experiment's objectives and background information.- Compare the results with theoretical predictions or previous studies.Conclusion:[Summarize the findings of the experiment. Address the following:]1. Summary of Results:- Restate the key findings and their significance.2. Objective Achievement:- Discuss whether the experiment achieved its objectives.3. Limitations:- Identify any limitations of the experiment, including potential sources of error or biases.4. Future Work:- Suggest areas for future research or improvements to the experiment.Discussion:[Provide a more in-depth analysis of the experiment. Include the following:]1. Comparison with Theoretical Predictions:- Compare the results with theoretical predictions or existing literature.2. Errors and Sources of Uncertainty:- Discuss any errors or sources of uncertainty in the experiment.3. Alternative Methods:- Consider alternative methods that could be used to achieve similar results.4. Practical Applications:- Discuss the potential practical applications of the experiment's findings.References:[List all the sources cited in the report, including books, journal articles, online resources, etc. Follow the appropriate citation style as required by your institution.]Appendices:[Include any additional information or data that is relevant to the experiment but not included in the main body of the report. This may include raw data tables, detailed calculations, or additional figures.]---Note: This template is a guide and should be adapted to fit the specific requirements of your experiment and the course. The length of the report will vary depending on the complexity of the experiment and the depth of analysis required.。
临床实验报告_英文
Title: Efficacy and Safety of a Novel Antidepressant in Major Depressive DisorderIntroduction:Major depressive disorder (MDD) is a common mental health condition characterized by persistent feelings of sadness, loss of interest, and decreased energy. Current treatments for MDD include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptakeinhibitors (SNRIs), and tricyclic antidepressants (TCAs). However, some patients may not respond adequately to these treatments or experience adverse effects. This clinical trial aimed to evaluate the efficacy and safety of a novel antidepressant, known as NovelAntidepressant (NA), in the treatment of MDD.Methods:The study was a randomized, double-blind, placebo-controlled trial conducted at three academic medical centers in the United States. Participants were diagnosed with MDD according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) criteria. Inclusion criteria were age 18-65 years, a minimum Hamilton Depression Rating Scale (HDRS) score of 17, and a history of inadequate response to at least one antidepressant treatment. Exclusion criteria included pregnancy, active substance abuse, and contraindications to the study medication.A total of 120 participants were randomly assigned to one of four treatment groups: Group A (NA 50 mg/day), GroupB (NA 100 mg/day), GroupC (NA 150 mg/day), and GroupD (placebo). Participants were treated for12 weeks, with follow-up assessments at weeks 2, 4, 6, 8, 10, and 12. The primary outcome measure was the change in HDRS score from baseline to week 12. Secondary outcome measures included the Montgomery-Asberg Depression Rating Scale (MADRS), the Sheehan Disability Scale (SDS), and the Patient Global Impression of Change (PGIC).Results:A total of 113 participants completed the study. The mean age of the participants was 38.2 ± 11.7 years, and 57.5% were female. There were no significant differences in demographic or clinical characteristics between the treatment groups at baseline.At week 12, the HDRS score improved significantly in all treatment groups compared to the placebo group (p < 0.001). The mean HDRS score change from baseline to week 12 was as follows: Group A (-14.2 ± 6.1), Group B (-15.8 ± 5.9), Group C (-16.5 ± 5.7), and Group D (-6.2 ±6.5). The between-group differences in HDRS score change were not statistically significant.Similarly, the MADRS and SDS scores also improved significantly in all treatment groups compared to the placebo group (p < 0.001). The mean change in MADRS score from baseline to week 12 was as follows: Group A (-10.5 ± 4.2), Group B (-11.8 ± 3.9), Group C (-12.2 ± 3.7), and Group D (-4.8 ± 4.5). The mean change in SDS score from baseline to week 12 was as follows: Group A (-8.3 ± 3.2), Group B (-9.1 ± 2.8), Group C (-9.8 ± 2.6), and Group D (-3.4 ± 3.1).The PGIC showed a significant improvement in all treatment groups compared to the placebo group (p < 0.001). The percentage ofparticipants with a "much improved" or "very much improved" rating was as follows: Group A (75%), Group B (80%), Group C (85%), and Group D (45%).Regarding safety, the most common adverse events reported were headache, nausea, and dry mouth. These adverse events were generally mild to moderate in severity and did not lead to discontinuation of the study medication in any of the treatment groups.Conclusion:The results of this clinical trial indicate that the novel antidepressant, NA, is effective and safe in the treatment of MDD. NA demonstrated significant improvements in HDRS, MADRS, and SDS scores, as well as PGIC, compared to placebo. The adverse event profile was consistent with the known side effects of SSRIs and SNRIs. Furtherresearch is needed to confirm the long-term efficacy and safety of NA in the treatment of MDD.Keywords: Major depressive disorder, NovelAntidepressant, efficacy, safety, randomized controlled trial, HDRS, MADRS, SDS, PGIC.。
实验报告 英文
实验报告英文Title: An Experimental Report: Unveiling the Secrets of Language Acquisition Introduction:Language acquisition is a fascinating field that has intrigued researchers for centuries. How do we learn languages? What factors influence our ability to acquire new languages? In this experimental report, we delve into the intricacies of language acquisition and explore the role of various factors in shaping our linguistic abilities.Experiment 1: The Impact of Age on Language AcquisitionIn this experiment, we examined the relationship between age and language acquisition. Participants from different age groups were exposed to a new language for a period of six months. The results revealed that younger participants demonstrated a higher proficiency in language acquisition compared to older participants. This finding suggests that there is a critical period for language acquisition during early childhood.Experiment 2: The Influence of Environment on Language AcquisitionTo investigate the impact of environment on language acquisition, we conducted a study comparing individuals raised in bilingual households and monolingual households. The results indicated that individuals exposed to multiple languages from an early age exhibited enhanced language acquisition skills. This suggests that the linguistic environment plays a crucial role in shaping language acquisition abilities.Experiment 3: The Role of Motivation in Language AcquisitionMotivation is a significant factor in language learning. In this experiment, we explored the relationship between motivation and language acquisition by comparing two groups of participants: one with high motivation and the other with low motivation. The findings revealed that individuals with high motivation achieved greater proficiency in language acquisition compared to those with low motivation. This highlights the importance of intrinsic motivation in language learning.Experiment 4: The Effect of Instructional Strategies on Language AcquisitionIn this experiment, we examined the effectiveness of different instructional strategies on language acquisition. Participants were divided into three groups: one group received traditional classroom instruction, another group engaged in immersive language learning, and the third group had a combination of both. The results demonstrated that the immersive language learning approach yielded the highest language acquisition outcomes. This suggests that hands-on, real-life experiences facilitate language acquisition more effectively than traditional classroom methods.Conclusion:Language acquisition is a complex process influenced by various factors. Our experiments shed light on the critical role of age, environment, motivation, and instructional strategies in shaping language acquisition abilities. Understanding these factors can help educators and language learners optimize their languagelearning experiences. Further research is necessary to explore additional variables and refine language acquisition theories. By unraveling the secrets of language acquisition, we can unlock new possibilities for effective language education and cross-cultural communication.。
英文实验报告
英文实验报告Experimental Report。
Introduction。
The purpose of this experiment was to investigate the effects of different temperatures on the rate of enzyme activity. Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are sensitive to changes in temperature, and this experiment aimed to explore how temperature affects the activity of the enzyme catalase.Materials and Methods。
To conduct this experiment, a solution of hydrogen peroxide was prepared and divided into several test tubes. Each test tube was then placed in a water bath at a specific temperature (5°C, 25°C, 45°C, and 65°C). A small piece of liver was added to each test tube, and the rate of oxygen production was measured using a gas syringe.Results。
The results of the experiment showed that the rate of enzyme activity increased as the temperature rose from 5°C to 45°C. However, at 65°C, the enzyme activity decreased significantly, and the reaction rate slowed down. This indicates that there is an optimal temperature for enzyme activity, and beyond this point, the enzyme becomes denatured and loses its function.Discussion。
实验报告的英文
实验报告的英文Experimental Report in EnglishIntroduction:In the realm of scientific research and academia, experimental reports play a crucial role in documenting and communicating the findings of various studies. These reports serve as a means to present the objective, methods, results, and conclusions of an experiment in a clear and concise manner. This article aims to explore the structure and key components of an experimental report, highlighting the importance of effective communication in scientific research. Objective:The objective section of an experimental report outlines the purpose and goal of the study. It provides readers with a clear understanding of what the researchers aimed to achieve through their experiment. This section often starts with a brief background, highlighting the significance of the research topic and the knowledge gap that the study intends to address.Methods:The methods section is a crucial part of an experimental report as it details the procedures and materials used in the study. It allows other researchers to replicate the experiment and verify the results. This section should include the experimental design, sample size, data collection methods, and any statistical analyses performed. Clear and concise descriptions are essential to ensure reproducibility and transparency.Results:The results section presents the findings of the experiment. It should be organized logically, using tables, graphs, or figures to represent the data collected. The results should be described objectively, avoiding any interpretation or speculation. It is important to include both quantitative and qualitative data, providing a comprehensive overview of the study's outcomes. Discussion:The discussion section provides an opportunity to interpret and analyze the results obtained. Here, researchers can compare their findings with existing literature, identify patterns or trends, and discuss the implications of their results. It is crucial to relate the findings back to the objective of the study and address any limitations or potential sources of error. This section should also highlight the significance of the research and suggest future directions for further investigation.Conclusion:The conclusion section summarizes the main findings of the experiment and reiterates their significance. It should be concise and avoid introducing any new information. This section plays a crucial role in reinforcing the key takeaways of the study and highlighting its contribution to the field of research. References:In an experimental report, it is essential to provide a list of references to acknowledge the sources of information and studies cited throughout thedocument. This section should follow a specific citation style, such as APA or MLA, and include all the necessary details for each reference.Appendices:Depending on the complexity of the study, additional information such as raw data, calculations, or supplementary materials may be included in the appendices. These should be clearly labeled and referenced within the main body of the report when necessary.Conclusion:In conclusion, an experimental report serves as a vital tool for researchers to communicate their findings and contribute to the scientific community. By adhering to a structured format and including key components such as objectives, methods, results, discussion, and conclusions, researchers can effectively present their work. The clarity and accuracy of the report are crucial for other scientists to understand, replicate, and build upon the findings. Therefore, mastering the art of writing an experimental report is essential for any aspiring researcher.。
英文实验报告的格式和写法
英文实验报告的格式和写法英文实验报告的格式和写法一份最标准的实验报告的格式：1. Abstract2. Introduction3. Method4. Results5. Discussion6. Conclusion7. ReferenceAbstract摘要摘要，就是整篇文章摘出来的要。
强烈建议整篇文章写完后再写摘要。
把文章每个部分选一些句子出来就可以拼凑成一个abstract了。
一个abstract 的模板：1 一两句话说明这个实验的主要理论依据，或者实验需要证明的假说。
2 一两句话说一下这个理论或者假说的相关的研究。
3 两三句话描述一下实验4 两三句话概括一下实验结果5 一句话说一个结论，解释一下这个实验的意义或结果的重要性转一个别人的example:Does a child’s focus correlate with barometr ic pressure? if so, does it correlatepositively or negatively? Tucker (1999) hypothesized a negative correlation, but this assertion has never been tested. Our team used the MISHA CPT to measure the focus of a group of 150 third-grade students. we dividedthe students into three groups of 50 students. one group took the MISHA CPT when barometric pressure was low, another group took it when barometric pressure was neutral, and the final group took it when barometric pressure was high. the results found that children focused significantly better when barometric pressure was low than when barometric pressure was neutral or high. the results suggest that when diagnosing ADHD, practitioners should give the CPT when barometric pressure is neutral.IntroductionIntroduction以实验目的为开头，解释一下这个实验需要证明的东西。
实验报告英文版
The determination of nitrogen content in the ammonium salt(Formaldehyde method)一、The experiment purpose1、To study the application of acid-base titration2、Master the formaldehyde method principle and the method for determination of nitrogen content in the ammonium salt3、The use of master the volumetric flask and pipet二、The experimental principleBecause NH4 acid is too weak to directly with NaOH standard solution titration, we usually using formaldehyde is transformed into titratable acid:4NH4++6HCOH=(CH2)6N4H++3H++6H2OProducts, hydrogen ions and (CH2)6N4H+ can be directly for accurate titration,titration product (CH2)6N4 is weak alkaline, so using phenolphthalein as indicator.According to the volume of the consumption of sodium hydroxide, may be calculated in proportion of nitrogen content in the ammonium salt:w(N)=C(NaOH)·V(NaOH)·M/m×100%三、Instruments and reagentsEquipment and materials:The alkali type buret(50ml)，Conical flask(250ml)，Volumetric flask(100ml)，pipette(20ml)，Measuring cylinder(10ml)，A beaker(100ml)，Analytical balance，Glass rodDrugs and reagents:Sodium hydroxide standard solution(0.1083mol/L),formaldehyde(40%)，phenolphthalein(2g/L ethanol solution),Samples of ammonium sulfate(S).四、The experimental steps1、Accurately according to 0.60 ~ 0.85 g samples of ammonium sulfate in 50 ml beaker, add right amount water dissolves directly transferred to the 100 ml volumetric flask and constant volume, shake a backup.2、Assimilation in sodium hydroxide standard solution to Alkali type buret after wash and embellish it.3、Accurately move 20 ml of the solution into the clean conical flask, add 10 ml of neutral formaldehyde solution and 1 drop of phenolphthalein indicator,shake the solution and let stand for 1 minutes, to the solution with sodium hydroxide standard solution titration is not fade reddish and maintain half minutes,as it to the end.4、Observe and record the volume of consumption of sodium hydroxide5、Parallel determination of three times, calculate the nitrogen content in the sample and the relative average deviation dr(≤0.3%)W(N)=(20.99%+21.01%+21.01%)/3=21.00%d=(0.01%+0.01%+0.01%)/3=0.01%dr=d/w(N)=0.01%/21.00%×100%=0.05%.。
英文实验报告范例模板
Title:Investigation of [Experiment Name]Introduction:The purpose of this experiment is to [briefly describe the objective of the experiment]. This report outlines the methodology used, the results obtained, and the conclusions drawn from the experiment.Objective:To [state the specific objective of the experiment].Materials and Methods:1. Materials:- [List all the materials used in the experiment, e.g., chemicals, equipment, samples, etc.]2. Methods:- Step 1: [Description of the first step in the procedure]- Step 2: [Description of the second step in the procedure]- Step 3: [Description of the third step in the procedure]- ...- Step n: [Description of the final step in the procedure]Procedure:1. [Detailed description of the experimental procedure, including any measurements taken, observations made, or data recorded]2. [Any additional steps or modifications to the procedure]3. [Finalization of the experiment]Results:1. Data Collection:- [Present the data collected during the experiment in tables, figures, or graphs]- [Include raw data and any calculations performed]2. Analysis:- [Discuss the analysis of the data, including any statistical methods used]- [Present the results of the analysis]3. Discussion:- [Interpret the results in the context of the experiment's objective]- [Compare the results with existing literature or theories]- [Identify any unexpected results and possible explanations]Conclusion:Based on the results of this experiment, [state the main conclusion(s)]. The experiment [supported/refuted] the hypothesis that [briefly state the hypothesis]. Further research is needed to [suggest any additional studies or investigations].Discussion:1. Limitations:- [Discuss any limitations of the experiment, such as equipment limitations, sample size, or procedural issues]2. Recommendations:- [Suggest improvements to the experiment, such as using different equipment, modifying the procedure, or expanding the scope of the study]Appendices:- [Include any additional information, such as detailed data tables, code, or additional figures that support the experiment]References:- [List all the references cited in the report, following the appropriate citation style]Acknowledgments:- [Thank any individuals, institutions, or organizations that contributed to the experiment or report]Author Information:- [Include the author's name, affiliation, and contact information]---Note: This template is a general guideline and should be adapted to fit the specific requirements of the experiment and the reporting guidelines of the institution or journal.。
英文实验报告的格式和写法
英⽂实验报告的格式和写法英⽂实验报告的格式和写法英⽂实验报告的格式和写法⼀份最标准的实验报告的格式：1. Abstract2. Introduction3. Method4. Results5. Discussion6. Conclusion7. ReferenceAbstract摘要摘要，就是整篇⽂章摘出来的要。
强烈建议整篇⽂章写完后再写摘要。
把⽂章每个部分选⼀些句⼦出来就可以拼凑成⼀个abstract了。
⼀个abstract 的模板：1 ⼀两句话说明这个实验的主要理论依据，或者实验需要证明的假说。
2 ⼀两句话说⼀下这个理论或者假说的相关的研究。
3 两三句话描述⼀下实验4 两三句话概括⼀下实验结果5 ⼀句话说⼀个结论，解释⼀下这个实验的意义或结果的重要性转⼀个别⼈的example:Does a child’s focus correlate with barometr ic pressure? if so, does it correlatepositively or negatively? Tucker (1999) hypothesized a negative correlation, but this assertion has never been tested. Our team used the MISHA CPT to measure the focus of a group of 150 third-grade students. we dividedthe students into three groups of 50 students. one group took the MISHA CPT when barometric pressure was low, another group took it when barometric pressure was neutral, and the final group took it when barometric pressure was high. the results found that children focused significantly better when barometric pressure was low than when barometric pressure was neutral or high. the results suggest that when diagnosing ADHD, practitioners should give the CPT when barometric pressure is neutral.IntroductionIntroduction以实验⽬的为开头，解释⼀下这个实验需要证明的东西。
(完整word版)英文实验报告模板
Determination of heavy metals in soil by atomic absorption spectrometry（AAS)Name: XuFei Group: The 3rd groupDate: Sep。
20th 2012Part 1 The introduction1。
1The purposes（1）Learn how to operate the atomic absorption spectrometry;（2)Learn how to do the pretreatment of soil samples;（3)Get familiar with the application of atomic absorption spectrometry。
1.2The principlesAtomic Absorption Spectrometry (AAS) is a technique for measuring quantities of chemical elements present in environmental samples by measuring the absorbed radiation by the chemical element of interest。
This is done by reading the spectra produced when the sample is excited by radiation. The atoms absorb ultraviolet or visible light and make transitions to higher energy levels 。
Atomic absorption methods measure the amount of energy in the form of photons of light that are absorbed by the sample。
实验报告英语作文模板
实验报告英语作文模板英文回答：Introduction。
The purpose of this experiment was to investigate the effect of temperature on the rate of a chemical reaction. The reaction studied was the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). The hypothesis was that the rate of the reaction would increase as the temperature increased.Methods。
The experiment was conducted by measuring the volume of oxygen produced over time at different temperatures. The following materials were used:100 mL of 3% hydrogen peroxide solution。
10 mL of catalase enzyme solution。
250 mL graduated cylinder。
Thermometer。
Stopwatch。
The procedure was as follows:1. The hydrogen peroxide solution was poured into the graduated cylinder.2. The catalase enzyme solution was added to the hydrogen peroxide solution.3. The stopwatch was started.4. The volume of oxygen produced was recorded every minute for 10 minutes.5. The temperature of the solution was recorded everyminute for 10 minutes.Results。
化学实验报告英文版
Title: Synthesis of Ethyl Acetate from Ethanol and Acetic AcidDate: [Date of Experiment]Student Name: [Your Name]Lab Section: [Your Lab Section Number]Objective: The objective of this experiment was to synthesize ethyl acetate, a volatile organic compound, by the esterification of ethanol and acetic acid. This reaction is a classic example of a nucleophilic acyl substitution reaction, where the alcohol attacks the carbonyl carbon of the acid to form the ester.Introduction:Esters are organic compounds derived from carboxylic acids by the replacement of the hydroxyl group with an alkyl or aryl group. Ethyl acetate is a widely used solvent in the pharmaceutical, food, and perfume industries due to its pleasant smell and volatility. The synthesis of ethyl acetate is typically achieved through the esterification reaction between acetic acid and ethanol in the presence of an acid catalyst.Materials:- Ethanol (CH3CH2OH)- Acetic acid (CH3COOH)- Concentrated sulfuric acid (H2SO4) - Catalyst- Sodium chloride (NaCl) - Dehydrating agent- Water - Solvent- Distillation apparatus- thermometer- glassware (beakers, flasks, etc.)- pH meterProcedure:1. Preparation of Reactants:- Measure 10 mL of ethanol and 10 mL of acetic acid into a round-bottom flask.- Add 1 mL of concentrated sulfuric acid as a catalyst.- Swirl the flask gently to mix the contents.2. Heating and Stirring:- Place the flask on a hot plate and heat the mixture to approximately 50-60°C. Maintain the temperature for about 30 minutes, ensuring the mixture is well-stirred.- The reaction is exothermic, so be cautious when heating.3. Adding Sodium Chloride:- After the reaction time, remove the flask from the heat.- Add a small amount of sodium chloride to the mixture. This helps to remove water from the reaction mixture, which can be a byproduct of the reaction.4. Observation:- The reaction mixture should now have a noticeable odor of ethyl acetate.- The mixture may also turn a light yellow due to the formation of the ester.5. Distillation:- Set up the distillation apparatus as per the instructor's instructions.- Heat the mixture to about 78°C, which is the boiling point ofethyl acetate.- Collect the distillate in a receiving flask. The distillate should have a fruity odor characteristic of ethyl acetate.6. Analysis:- Use a pH meter to check the pH of the distillate. Ethyl acetate is a neutral compound, so the pH should be close to 7.Results:- The reaction mixture turned a light yellow after the addition of sodium chloride.- The distillation process yielded approximately 5 mL of distillate with a fruity odor.- The pH of the distillate was measured to be 6.8.Discussion:The synthesis of ethyl acetate from ethanol and acetic acid was successful, as evidenced by the formation of a volatile distillate with the characteristic odor of ethyl acetate. The use of concentrated sulfuric acid as a catalyst facilitated the esterification reaction by protonating the carbonyl oxygen of acetic acid, making it more electrophilic and susceptible to nucleophilic attack by the alcohol. The addition of sodium chloride helped to remove water, which could potentially interfere with the reaction by acting as a nucleophile.The distillation process was crucial for isolating the ethyl acetate from the reaction mixture. By carefully controlling the temperature, we were able to collect the desired compound while leaving behind the unreacted starting materials and byproducts.Conclusion:In conclusion, the synthesis of ethyl acetate from ethanol and acetic acid was successfully achieved through the esterification reaction. The use of concentrated sulfuric acid as a catalyst and the distillation process allowed for the isolation of the desired compound. Thisexperiment provided a practical understanding of esterification reactions and the techniques involved in organic synthesis.Appendix:- Chemical Equation:\[ \text{CH}_3\text{CH}_2\text{OH} + \text{CH}_3\text{COOH}\xrightarrow{\text{H}_2\text{SO}_4} \text{CH}_3\text{COOCH}_2\text{CH}_3 + \text{H}_2\text{O} \]- Safety Precautions:- Wear safety goggles and gloves at all times.- Avoid contact with concentrated sulfuric acid and acetic acid.- Do not inhale the vapors of the distillate.。
英文版实验报告
英文版实验报告英文版实验报告Introduction:In this report, we present the findings and analysis from a recent experiment conducted to investigate the effects of caffeine on cognitive performance. Caffeine, a widely consumed psychoactive substance, is known to have stimulant effects on the central nervous system. The objective of this experiment was to examine whether caffeine could enhance cognitive abilities such as attention, memory, and reaction time.Methodology:Participants: A total of 50 healthy adult volunteers aged between 18 and 30 years were recruited for the study. They were randomly assigned to two groups: the experimental group (received caffeine) and the control group (received a placebo).Procedure: Participants arrived at the laboratory after an overnight fast and were instructed to abstain from consuming any caffeinated beverages or food for at least 12 hours prior to the experiment. They were then given either a capsule containing 200mg of caffeine or a placebo capsule. The experimenters, as well as the participants, were blinded to the group assignments.Cognitive tests: After a 30-minute absorption period, participants completed a battery of cognitive tests. These included a sustained attention task, a memory recall task, and a reaction time test. The tests were designed to measuredifferent aspects of cognitive function.Results:The results of the experiment revealed interesting insights into the effects of caffeine on cognitive performance. Participants in the experimental group, who received caffeine, demonstrated significantly better performance on the sustained attention task compared to those in the control group. They also exhibited improved memory recall and faster reaction times.Discussion:The findings of this experiment support the hypothesis that caffeine can enhance cognitive abilities. The stimulant properties of caffeine may have contributed to the improved attention and memory performance observed in the experimental group. The faster reaction times may be attributed to the increased alertness and arousal associated with caffeine consumption.These results are consistent with previous research on the effects of caffeine on cognitive function. Caffeine has been shown to increase alertness, improve attention, and enhance memory in various studies. However, it is important to note that individual responses to caffeine can vary, and some individuals may experience negative effects such as increased anxiety or disrupted sleep. Implications:The findings of this experiment have implications for various fields, including education, workplace productivity, and even sports performance. The use of caffeine as a cognitive enhancer may be beneficial in situations that requiresustained attention and mental alertness, such as during exams or high-pressure tasks.However, it is crucial to consider the potential risks and limitations associated with caffeine consumption. Excessive intake of caffeine can lead to adverse effects such as jitteriness, increased heart rate, and disrupted sleep patterns. Therefore, it is recommended to consume caffeine in moderation and be aware of individual tolerance levels.Conclusion:In conclusion, this experiment provides evidence that caffeine can enhance cognitive performance, particularly in the domains of attention, memory, and reaction time. The findings support the use of caffeine as a cognitive enhancer, but caution should be exercised regarding its potential side effects. Further research is needed to explore the long-term effects of caffeine on cognitive function and to identify optimal dosages for different populations.。
微型实验报告英文模板
Title: [Experiment Name]Objective(s):- To [state the primary objective of the experiment].- To [state any secondary objectives or learning outcomes].Materials:- [List all the materials used in the experiment, including equipment, chemicals, and any other items required].Procedure:1. [Step 1: Description of the first step in the procedure, including any setup or preparation required].2. [Step 2: Description of the second step, including any measurements or observations taken].3. [Step 3: Description of the third step, if applicable].4. [Continue with subsequent steps, ensuring each is clearly described and includes any necessary measurements or observations].Results:- [Table or figure 1: Present your data in a clear and organized format. Include labels, units, and any necessary descriptions].- [Table or figure 2: If applicable, include additional data or results].- [Graphs or charts: If relevant, include graphs or charts to illustrate the data or trends].Discussion:- [Introduction to the discussion section, briefly summarizing the main findings of the experiment].- [Explanation of the results, discussing how they relate to the objectives and literature].- [Analysis of any unexpected results or deviations from the expected outcomes].- [Comparison of your results with those found in the literature or with the predictions made before the experiment].- [Conclusions drawn from the experiment, including any limitations or areas for further investigation].Conclusion:- [Summary of the main findings and their implications].- [Reiteration of the experiment's objectives and whether they were achieved].- [Suggestions for future experiments or improvements to the current procedure].References:- [List any references cited in the report, following the appropriate citation style].Appendices:- [Include any additional information or data that may be helpful for understanding the experiment but is not essential for the main report].Acknowledgments:- [Optional section to acknowledge anyone who assisted with the experiment, provided materials, or contributed to the research in any way].---Example of a Microscopic Experiment ReportTitle: Study of Cell Structures Using a Compound MicroscopeObjective(s):- To observe and identify various cell structures using a compound microscope.- To understand the significance of these structures in cellular function.Materials:- Compound microscope- Slides with different cell samples (e.g., plant cells, animal cells)- Cover slips- Lens cleaner- Light source- Microscope slide holder- Magnification chartsProcedure:1. [Set up the compound microscope with the appropriate light source and focus the lens to obtain a clear view of the slide holder].2. [Prepare the slides by placing a drop of water on a clean slide and placing a cover slip over a small sample of the cell material].3. [Place the slide on the microscope stage and adjust the focus until the cells are in sharp focus].4. [Observe the cells at different magnifications and record your observations].5. [Clean the lenses with lens cleaner after each observation].Results:- [Table 1: Data on cell size and shape observed at different magnifications].- [Figure 1: Microscopic images of plant and animal cells showing various structures].Discussion:- [The results show that plant cells have a rigid cell wall, a large central vacuole, and chloroplasts, while animal cells lack a cell wall and have a smaller vacuole].- [These observations are consistent with the literature and confirm the presence of characteristic cell structures].- [The presence of chloroplasts in plant cells indicates their ability to perform photosynthesis, while the lack of chloroplasts in animalcells suggests they rely on external sources for energy].- [The experiment highlights the importance of cell structure in the functioning of different types of cells].Conclusion:- [The objectives of the experiment were achieved by successfully observing and identifying various cell structures].- [The experiment provides a basic understanding of the differences between plant and animal cells and their structural adaptations for different functions].- [Future experiments could involve studying the dynamics of cellular processes or the effects of different environmental conditions on cell structures].References:- [Biology textbook or scientific journal articles on cell structure and function].Appendices:- [Additional microscopic images and detailed measurements of cell sizes and shapes].。
实验报告的英文模板
Title:[Insert the title of your experiment here]Student’s Name:[Your Name]Student’s ID:[Your Student ID]Course Name:[Name of the Course]Course Code:[Course Code]Date of Experiment:[Date of the Experiment]Objective:[State the main objective of the experiment in a single sentence.]Background Information:[Provide a brief overview of the scientific principles or theories related to the experiment. This section should include the history, significance, and relevance of the topic.]---Abstract:[Write a concise summary of the experiment, including the objective, methodology, results, and conclusions. This section should be around 150-200 words.]---1. Introduction[Provide a detailed introduction to the experiment, including the following sections:]1.1 Problem Statement:[Clearly state the problem or research question that the experiment aims to address.]1.2 Literature Review:[Summarize the existing research or theories related to the experiment, highlighting any gaps or questions that your experiment aims to fill or answer.]1.3 Hypothesis:[State the hypothesis or prediction that you are testing in the experiment.]1.4 Significance:[Explain the importance and potential impact of the experiment on the field of study.]---2. Materials and Methods[Describe the materials, procedures, and techniques used in the experiment. Include the following sections:]2.1 Materials:[List all the equipment, chemicals, samples, or other materials used in the experiment.]2.2 Procedure:[Provide a step-by-step description of the experimental procedure, including any measurements, observations, or data collection methods.]2.3 Control and Variable:[Identify the control variables and explain how they were controlled. Also, describe the independent and dependent variables and how they were manipulated or measured.]2.4 Data Analysis:[Explain the methods used to analyze the data collected during the experiment.]---3. Results[Present the results of the experiment in a clear and organized manner. Include the following sections:3.1 Raw Data:[Provide tables, charts, or graphs that present the raw data collected during the experiment.]3.2 Observations:[Record any observations made during the experiment that are relevant to the results.]3.3 Analysis:[Discuss the analysis of the data, including any calculations,statistical tests, or other methods used to interpret the results.]---4. Discussion[Analyze and interpret the results in the context of the experiment’s objective and hypothesis. Include the following sections:4.1 Results Validation:[Discuss the validity of the results, considering any potential sources of error or limitations in the experiment.]4.2 Hypothesis Testing:[Evaluate whether the results support or contradict the hypothesis.]4.3 Comparison with Literature:[Compare the results with those reported in the literature, highlighting any similarities or differences.]4.4 Implications:[Discuss the implications of the results for the field of study and any potential applications.]---5. Conclusion[Summarize the main findings of the experiment and restate the conclusion in relation to the hypothesis. Include the following sections:5.1 Summary:[Provide a brief summary of the experiment, including the objective, methodology, and results.]5.2 Conclusion:[State the conclusion based on the results and discuss whether the hypothesis was supported or refuted.]5.3 Recommendations:[Offer suggestions for future research or improvements to the experiment.]---6. References[List all the references cited in the report in the appropriate citation style (e.g., APA, MLA, Chicago).---Appendices[Include any additional information, such as detailed data tables, code, or additional figures that are not part of the main text but may be useful for understanding the experiment.]---Note: This template is a guide and should be customized according to the specific requirements of your experiment and the guidelines provided by your instructor or institution.。
关于英文版化学实验报告
篇一：英文版化学实验报告Title: Preparation of Fe scrap from waste(NH4)The purpose of the experimentLearn the method used scrap iron preparation of ferrous ammonium sulfate.Familiar with the water bath, filtered, and evaporated under reduced pressure and crystallization basic working.The experimental principle, the iron and sulfuric acid to generate reactive ferrous sulfate, ferrous sulfate and ammonium sulfate in an aqueous solution of equal molar interaction, becomes less soluble blue generate ferrous ammonium sulfate.Fe+H2SO4=FeSO4+H2 (gas)FeSO4+ (NH4)2SO4+6H2O=(NH4) Usually ferrous rocks are easily oxidized in air, but after the formation of relatively stable perfunctory, not to be oxidized.Experiment to use instruments, scales, constant temperature water bath, pumps, basins, cups, 10ml graduated cylinder, asbestos mesh, glass, tripod, alcohol lamp, funnel.Iron pieces to a solid pharmaceutical use, use of acid ammonium sulfate and 3mol / l of sulfuric acid, concentrated sulfuric acid.The experiment was divided into four steps.The first step Said iron powder 4g into a beaker and then 50ml10ml, 3mol / L H2SO4 was added to the same beaker. The second step will be the beaker is heated to no more bubbles, and then filtered hot and the filtrate was then filled in 100ml beaker. The third step, called 4g (NH4)2SO4, and the resultingammonium sulfate and of water to form a saturated solution, and then add it to the ferrous sulfate solution, adjusted with concentrated sulfuric acid to PH = 1. A fourth step, the third step the solution was heated in a water bath to the surface until the film is crystallized, it was slowly cooled andthen filtered under reduced pressure to stand finally dried, weighed and the yield was calculated. The results obtained bluish powderycrystals. Have this result we can calculate yield, starting with the first step we tried to know the amount of iron, should this wecan calculate the theoretical sulfate ferrous sulfate is , thenferrous sulfate obtained by thetheoretical value of ammonium. FeSO4+（NH4）2SO4+6H2O=FeSO4.(NH4) molX=m=XM=ⅹ392g/mol=Yield = the actual value of the formula is divided by the theoretical value by 100%.it will be calculated into the dataobtained in a yield of %.篇二：英文版化学实验报告The preparation of alkali type copper carbonateThe first:the experiment purposethe methods of alkali type copper carbonate prepared andprinciplethe design experiment to cultivate independent design abilityand chemical research thinkingThe second:the experimental principleThe solubility of Cu(OH)2and CuCO3 are similar, With Cu2(OH)2CO3 solid precipitation in the solution.2CuSO4+2Na2CO3+H2O==Cu2(OH)2CO3↓+2Na2SO4+CO2↑The third:the experimental stepspreparationDisposes mole of each litre acid sour coppers and sodiumcarbonate solution each 100 milliliters.feeding order and raw material compare the explorationAccording to 2:,2:2,2:,2: allocated proportion, is accepted after passing an examination the surface disposition acid sour copper and the sodium carbonate solution, joins in separately 8 test tubes,joins rapidly the sulfuric acid copper solutions in the sodium carbonate solution, vibrates about other constant temperature ten minutes as for 75 degrees Celsius water baths in, the inversion feeding order recreates one time, the observation has the precipitation speed, quantity how many and the color,discovers the optimum condition.explorationAccording to the above optimum condition, takes the acid sour copper solutions and the sodium carbonate solution separately under 50, 75 and 100 degrees Celsius responded that, discovers the optimum temperature.to 2, 3 step exploration optimum condition prepares the final product, and with the distilled water lavation, finally dries and calls heavily.(Enlarges ten times with conical flask to do)The fourth:the experimental itemsInstrument and material: The balance, the beaker, the glass rod, the Volumetric flask, the test tube, the filter flask,the Buchner funnel, the Erlenmeyer flaskChemicals: Copper carbonate, sodium sulfateThe fifth:the experimental resultthe step 2, the observation phenomenon optimum condition is equal to for the cupric sulfate compared to the sodium carbonate 2:, the feeding order for joins the sulfuric acid copper solutions to the sodium carbonate solution in.the step 3, the observation phenomenon optimum temperature is 75 degrees Celsiusto the copper sulfate solution than sodium carbonatesolution is 2:2. 4, ten times magnification, alkali type copper carbonate was zero point five grams, according to the reaction equation calculation yield.2CuSO4+2Na2CO3+H2O==Cu2(OH)2CO3↓+2Na2SO4+CO2↑2 1* X2/(*)=1/XX=M[Cu2(OH)2CO3]=*222=Productive rate:/*100%=45%The sixth : Questions1. Which cupric salt suit the system to take the cupric basic carbonate? Answer:Cu(NO)3 or CuSO42. The reaction temperature has what influence to this experiment?.Answer:The temperature excessively is low, the response speed is slow; The hyperpyrexia, the Cu2(OH)2CO3 decomposition is CuO.3. Reaction is carried out at what temperature will appear Brown product? What is the brown substance?Answer: The temperature is equal to 100 degrees Celsius and this brown material is CuO.篇三：化学专业英语实验报告In the physiological saline the sodium chloride content determinationone, the experimental goal1、 the study silver nitrate standard solution configuration and the demarcation method2、 the grasping law raises Si Fa to determine the chloride ion the method principle two, the experimental principleWith AgNO3 standard solution titration Cl - Ag + + Cl - = = AgCl，At ph - available fluorescent yellow do indicator (HFIn)HFIn = = FIn (yellow) + H +Sp before: excessive, AgCl precipitation adsorption of Cl - AgCl Cl - + FIn - (yellow-green)After Sp: Ag +, excessive AgCl precipitation Ag + adsorption, adsorption FIn - reprecipitation AgCl, Ag + + FIn - = = AgCl, Ag +, FIn - (pink) The finish color changes: from yellowish green to orange Three, instruments and reagentsEquipment and materials：Acid type buret (150 ml), taper bottle (250 ml), volumetric flask (100 ml), pipette (20 ml, 10 ml), measuring cylinder (100 ml, 10 ml), beaker (100 ml), brown reagent bottles (500 ml), analytical balance, platform scale. The reagent and drug: Analysis of AgNO3 (s, pure), NaCl (s,analysis of pure), physiological saline, fluorescent yellow - starch. Fourth, the experimental stepsAccurately moving 25 ml co ncentration is mol ╱ L of silver nitrate standard solution in the middle of 250 ml volumetric flask, dilute to scale as a standard solution titration.Accurately moving saline ml to 250 ml conical flask, add 50 ml water, 3 drops of fluorescent yellow indicator, 5% starch indicator 5 ml, under continuous agitation, using silver nitratestandard solution titration to solution from yellow to pink is the end point. Record the consumption volume of silver nitratestandard solution, parallel determination of 3, calculate the sodium chloride content in saline and relative mean deviation.Fifth, data recording and processingFormula: ρ = V×MrNaCl×CAgNO3 x 100The average deviation d= dr=d/ρ×100%=%实验名称：硅片的清洗实验目的：1.熟悉清洗设备2.掌握清洗流程以及清洗前预准备实验设备：1.半导体兆声清洗机（SFQ-1006T）；SC-2实验背景及原理：清洗的目的在于清除表面污染杂质，包括有机物和无机物。
波尔共振实验报告英文(3篇)
第1篇Introduction:The Bohr resonance experiment is designed to investigate the phenomenon of resonance in a system subjected to a periodic external force. This experiment aims to observe the relationship between the amplitude and period of free vibration, study the damping vibration and measure the damping coefficient, observe the resonance phenomenon and its characteristics, and learn to use the stroboscopic method to determine dynamic physical quantities, such as phase difference. This report will summarize the experiment objectives, procedures, results, and analysis.I. Experiment Objectives:1. Investigate the relationship between the amplitude and period of free vibration in the Bohr resonance system.2. Study the damping vibration and measure the damping coefficient in the system.3. Observe the resonance phenomenon and its characteristics in the Bohr resonance system.4. Learn to use the stroboscopic method to determine dynamic physical quantities, such as phase difference.5. Analyze the effects of different damping torques on forced vibration and its amplitude-frequency and phase-frequency characteristics.II. Experimental Procedures:1. Set up the Bohr resonance apparatus and ensure its stability.2. Measure the free vibration of the system by adjusting the external force frequency and observe the relationship between the amplitude and period of the free vibration.3. Adjust the damping force to study the damping vibration and measure the damping coefficient.4. Adjust the external force frequency to observe the resonance phenomenon and its characteristics, including the amplitude-frequency and phase-frequency characteristics.5. Use the stroboscopic method to measure the phase difference between the external force and the system's response.6. Record the experimental data and analyze the results.III. Experimental Results and Analysis:1. Relationship between amplitude and period of free vibration:Through the experiment, we found that the amplitude of free vibration is inversely proportional to the period. As the period decreases, the amplitude increases, and vice versa.2. Damping vibration and damping coefficient:The experiment showed that as the damping force increases, the amplitude of the vibration decreases, and the period of the vibration increases. The damping coefficient can be calculated based on the measured data.3. Resonance phenomenon and its characteristics:When the external force frequency is equal to the natural frequency of the system, resonance occurs. At this time, the amplitude of the vibration is the largest, and the phase difference between the external force and the system's response is 90 degrees.4. Phase difference measurement:Using the stroboscopic method, we measured the phase difference between the external force and the system's response. The results show that the phase difference is consistent with the theoretical prediction.5. Effects of different damping torques on forced vibration:The experiment showed that as the damping torque increases, the amplitude of the vibration decreases, and the phase difference between the external force and the system's response increases. The amplitude-frequency and phase-frequency characteristics of the system are also affected by the damping torque.IV. Conclusion:The Bohr resonance experiment successfully observed the phenomenon of resonance in a system subjected to a periodic external force. The experiment results indicate that the amplitude and period of free vibration, damping coefficient, resonance phenomenon, and phase difference can be measured and analyzed. The experiment also verifies the effects of different damping torques on forced vibration. This experiment provides a valuable understanding of resonance phenomena and their applications in engineering and scientific research.Acknowledgments:We would like to express our gratitude to the instructor and teaching assistants for their guidance and assistance throughout the experiment. We also appreciate the opportunity to conduct this experiment and learn about resonance phenomena.第2篇Introduction:The Bohr resonance experiment is a fundamental physics experiment that investigates the resonance phenomenon in a mechanical system. It aims to explore the relationship between the frequency of the external force and the natural frequency of the system, and to study the characteristics of resonance. This experiment provides a practical demonstration of the resonance phenomenon and its applications in various fields.Experiment Purpose:1. To investigate the relationship between the frequency of the external force and the natural frequency of the system.2. To study the characteristics of resonance and the factors affecting resonance.3. To observe the phenomenon of resonance and its applications in engineering and scientific research.Experimental Setup:1. The experimental apparatus includes a Bohr resonance instrument, a motor, a power supply, a signal generator, and a data acquisition system.2. The Bohr resonance instrument consists of a frame, a suspended mass, and a photoelectric sensor. The frame is connected to a motor through a spring, and the suspended mass is connected to the frame by a spring.3. The signal generator generates a sinusoidal signal with a variable frequency, which is then fed into the motor to drive the system.Experimental Procedure:1. Adjust the position of the suspended mass so that the system is at rest.2. Connect the signal generator to the motor and set the initial frequency of the signal.3. Start the motor and observe the motion of the suspended mass.4. Record the frequency of the signal and the corresponding displacement of the suspended mass.5. Repeat the experiment with different frequencies of the signal and record the data.6. Plot the frequency-displacement curve and analyze the resonance phenomenon.Results and Analysis:1. As the frequency of the signal increases, the displacement of the suspended mass also increases.2. When the frequency of the signal is equal to the natural frequency of the system, the displacement of the suspended mass reaches the maximum, indicating the resonance phenomenon.3. The frequency-displacement curve shows a peak at the resonance frequency, which represents the maximum amplitude of vibration.4. The amplitude of vibration decreases with the increase of the frequency deviation from the resonance frequency.5. The resonance phenomenon is affected by factors such as the stiffness of the spring, the mass of the suspended mass, and the dampingcoefficient of the system.Discussion:1. The resonance phenomenon occurs when the frequency of the external force matches the natural frequency of the system. This phenomenon is widely used in various fields, such as engineering, physics, and biology.2. The resonance frequency is determined by the properties of the system, such as the stiffness of the spring and the mass of the suspended mass. By adjusting these properties, the resonance frequency can be controlled.3. The resonance phenomenon can be used to achieve the maximum transfer of energy between the system and the external force. This is of great significance in engineering applications, such as vibration isolationand energy transmission.4. The resonance phenomenon can also be used to study the properties of materials and structures, such as the elasticity and damping coefficient. This is of great significance in the field of material science.Conclusion:The Bohr resonance experiment provides a practical demonstration of the resonance phenomenon and its characteristics. By studying therelationship between the frequency of the external force and the natural frequency of the system, we can better understand the resonance phenomenon and its applications in various fields. This experiment has important significance for the development of physics and engineering.第3篇Abstract:The purpose of this experiment was to study the phenomenon of resonance in the Bohr resonance system. By adjusting the frequency and amplitudeof the external force, the resonance characteristics of the system were observed and analyzed. The experiment results were in good agreementwith the theoretical predictions, which verified the validity of theBohr resonance model.1. IntroductionResonance is a phenomenon in which the amplitude of vibration in a system increases significantly when the frequency of the external force is close to the natural frequency of the system. This phenomenon has important applications in engineering, physics, and other fields. The Bohr resonance experiment is designed to study the resonance characteristics of a system with a simple structure, and to verify the validity of the Bohr resonance model.2. Experimental SetupThe experimental setup consists of a Bohr resonance system, which includes a horizontal rod with a weight at one end, a spring with a certain stiffness, and a small mass attached to the other end of the rod. The mass can be adjusted to change the natural frequency of the system. The external force is applied by a motor-driven shaker, which can adjust the frequency and amplitude of the force.3. Experimental Procedure1. Adjust the mass on the rod to obtain a certain natural frequency of the system.2. Connect the shaker to the system and adjust the frequency and amplitude of the external force.3. Observe the resonance characteristics of the system, including the amplitude and phase difference between the external force and the response of the system.4. Record the experimental data and compare with the theoretical predictions.4. Results and Discussion1. Natural FrequencyThe natural frequency of the system was measured by adjusting the mass on the rod. The theoretical natural frequency was calculated using the formula: fn = (1/2π)√(k/m), where k is the stiffness of the spring and m is the mass. The experimental results were in good agreement with the theoretical predictions.2. Resonance CharacteristicsWhen the frequency of the external force was close to the natural frequency of the system, the amplitude of vibration increased significantly, indicating that resonance had occurred. The phase difference between the external force and the response of the system was measured using a phase meter. The experimental results showed that the phase difference was approximately 90° during resonance.3. Influence of AmplitudeThe amplitude of the external force was adjusted to observe its influence on the resonance characteristics of the system. The results showed that as the amplitude increased, the resonance amplitude also increased, but the phase difference remained approximately 90°.5. ConclusionThe Bohr resonance experiment was successfully conducted, and the experimental results were in good agreement with the theoretical predictions. This verifies the validity of the Bohr resonance model and provides a good understanding of the resonance characteristics of a system with a simple structure.6. References1. Bohr, N. (1913). On the Constitution of Atoms and Molecules. Philosophical Magazine, 26(157), 1-25.2. Morse, P. M., & Feshbach, H. (1953). Methods of Theoretical Physics. McGraw-Hill.3. Brown, L. S., & Merrill, F. H. (1940). The Theory of Elasticity. John Wiley & Sons.。
如何写英语实验报告
We carry out an experiment to find out…, Following apparatus is used ： …and…
First…then…next…after that…lastly… You can see that…
描写实验目的： ①We carry out an experiment to find
out… ②The aim of the experiment is to
find… ③We carry out an e实x验p目e的r：im检验en铝t在,空w气it中h加t热h后e，p重u量r是p否o会se发生o变f 化 d…i…stco ofinvdeoruitnifgth…ere’s a change in weight when
crucible）,坩埚钳（ tongs）
Turn to Page 48. FUNCTION
WHohwicmhapnayrtstiespist ainreatnheerxepinertihme emnett?hod?
Well, first, put the magnesium in the crucible. Then put the crucible on the balance and weigh it. Next, I light the Bunsen burner. After that, I hold the crucible over the Bunsen flame . Lastly, we need to weigh the magnesium again.
如何写英语实验报告
简单的实验报告英语作文
简单的实验报告英语作文Experimental Report: The Effect of Temperature on the Rate of Enzyme Activity。
Introduction。
Enzymes are proteins that catalyze biochemicalreactions in living organisms. They play a crucial role in many biological processes, such as digestion, metabolism, and cellular respiration. Enzyme activity is affected by various factors, including temperature, pH, substrate concentration, and enzyme concentration. In this experiment, we investigated the effect of temperature on the rate of enzyme activity using the enzyme lactase and the substrate lactose.Materials and Methods。
Materials:Lactase solution。
Lactose solution。
Test tubes。
Thermometer。
Water bath。
Timer。
Spectrophotometer。
Methods:1. Prepare lactase solution by diluting 1 mL of lactase stock solution with 9 mL of distilled water.2. Prepare lactose solution by dissolving 1 g of lactose in 100 mL of distilled water.3. Label six test tubes as follows: 0°C, 20°C, 30°C, 40°C, 50°C, and 60°C.4. Add 2 mL of lactase solution to each test tube.5. Place the test tubes in a water bath at the designated temperature for 5 minutes to equilibrate.6. Add 2 mL of lactose solution to each test tube and start the timer.7. Mix the contents of each test tube by gently swirling.8. After 1 minute, remove 1 mL of the reaction mixture from each test tube and transfer it to a spectrophotometer cuvette.9. Measure the absorbance of each sample at 540 nm using a spectrophotometer.10. Repeat steps 8-9 every minute for 5 minutes.11. Record the absorbance values in a table and calculate the average rate of enzyme activity for each temperature.Results。
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determination of heavy metals in soil by atomic absorption spectrometry(aas) name: xufei group: the 3rd group date: sep. 20th 2012part 1 the introduction1.1the purposes(1)learn how to operate the atomic absorption spectrometry;(2)learn how to do the pretreatment of soil samples;(3)get familiar with the application of atomic absorption spectrometry.1.2the principlesatomic absorption spectrometry (aas) is a technique for measuring quantities ofchemical elements present in environmental samples by measuring the absorbedradiation by the chemical element of interest. this is done by reading the spectraproduced when the sample is excited by radiation. the atoms absorb ultraviolet orvisible light and make transitions to higher energy levels . the concentration is calculated based on the beer-lambert law. absorbance isdirectly proportional to the concentration of the analyte absorbed for the existingset of conditions. the concentration is usually determined from a calibration curve,obtained using standards of known concentration. calibration curve method: preparestandard solutions of at least three different concentrations, measure the absorbanceof these standard solutions, and prepare a calibration curve from the values obtained.then measure the absorbance of the test solution adjusted in concentration to ameasurable range, and determine the concentration of the element from the calibrationcurve. part 2 the materials and apparatus part 3 the procedure3.1 operating procedure for aas (2) install required hollow cathode lamp. select “t” before turning to the powerand hollow cathode lamp. then select appropriate la mp current and preheat for 30min.(3) make sure electrical meter to point to zero and then turn on high-voltagepower.(4) select appropriate slit width.(5) rotate monochromator and select required wavelength. if the power meter istoo high or low, adjust negative high voltage until the meter reads full scale.(6) adjust light point and wavelength so that the meter represents the maximumvalue.(8) inject distilled water into the flame and continue to preheat the burner.inject distilled water into the flame after each sample.(9) select “e”, inject blank solution into the flame and adjust the meter tozero.(10) optimize analysis conditions and measure standard solution and samples.(12) select “t” before turning off high voltage power, decrease lamp currentand then turn off the lamp. at the same time, all buttons should be on originalpositions.(13) check the equipment before leaving the laboratory.3.2 determination of soil samples (1) preparation of extracting solution (0.05 mol/l edta solution) 18.6 g of edta is dissolved with water in a beaker (500 ml). the ph is adjustedto 7.0 using dilute ammonia. the mixture is transferred into a volumetric flask(1000ml), dilute to the mark and mixed well.(2) treatment of soil samples 2.50 g of air-dried soil (60- 100 mesh) is put into an erlenmeyer flask withstopper (100 ml). 12.5 ml of edta solution is added. the mixture is shaken for 1hand then filtered. the filtrate is preserved for analysis.(3) preparation of cu standard stock solution 0.10 g of cu is dissolved in 15 ml of (1:1) nitric acid solution. the mixtureis transferred into a volumetric flask (1000 ml) and diluted to the mark withre-distilled water. the concentration of the stock standard solution is 100g/ml. (theconcentration should be calculated according to the mass of cu).the working custandard solution (10μg/ml) is obtained by diluting 10 ml of cu standard stocksolution to 100 ml with re-distilled water.(4) plotting of the standard curve 0 ml, 1 ml, 2 ml, 3 ml, 4 ml and 5 ml of cu standard solution (10μg/ml) are addedrespectively to 6 volumetric flask (10 ml) with 1 ml of 5 mol/l hydrochloric acid.the mixture is diluted with re-distilled water and mixed well to give 0μg/ml, 1.00μg/ml,2.00μg/ml, 3.00μg/ml, 4.00μg/ml, 5.00μg/ml of cu, respectively. theabsorbance is measured at wavelengths of 3247 ?. the standard curve is constructedby plotting absorbance vs. concentration.(5) determination of samples the sample solution is analyzed using the same procedure and conditions as forthe standard curve. the concentration of cu is obtained from the standard curve basedon the absorbance.part 4 the results4.1 the raw data 4.2 aas standard curve 4.3 calculationthe absorbance of sample is 0.0511. according to the formula above :y=0.0446x+0.0024,r2=0.9997 the concentration of cu in the sample is:1.091mg/l. part 5 discussionin this experiment, we use the aas to determine cu in soil. i learn how to operatethe aas and the limitation. in the experimental process, standard solution wasprepared in strict accordance with the experimental requirements and i learn how todeal with the data. finally we get the standard curve, then, the sample concentrationis calculated according to the absorbance of the sample. ultimately, we get the linear formula is y = 0.0446x + 0.0024 and r2=0.9997. fromaccording to the formula and the absorbance of cu in the sample is 0.0511, we drawthe concentration of cu in the sample is 1.091μg/ml. we have known that theconcentration of test sample measured by instrument is 1.091mg/l. we can say our result of experiment is so very accurate from the standard curveof cu and the value of r(r2=0.09997). the accurate data is due to the efforts of weeveryone. thanks for every members of our group.i have some suggestions for our experiments. firstly when we’ll do an experiment,we must prepare our pre-lab by ourselves and translate it into chinese .only do likethis, we can understand the experiment well. secondly we should prefer to solute theproblems in the experiment rather than ask for ta. finally, everyone should understandhis own task in the experiment.篇二：英文实验报告的格式和写法英文实验报告的格式和写法【转】2010-10-04 06:03 一份最标准的实验报告的格式：1. abstract2. introduction3. method4. results5. discussion6. conclusion7. reference分别来分享下近来学到的。