Essays on Experiment

The variables

Stress can occur to any human being. Stress is a normal psychological and physical reaction to the demands of life particularly to traumatic incidences. The process of induced abortion or natural is a stressful time for many women (Adler, N. E., David, H. P., Major, B. N., Roth, S. H., Russo, N. F., & Wyatt, G. E. 1990, p. 41). The stress can occur before and after abortion. In this study we are focusing only on post abortion stress. Women who undergo abortion natural or induced are likely to experience acute stress i.e. Acute stress originates from the demands and Continue reading...

Objectives

The aim of this experiment is to study the effective thermal conductivity of a heat pipe. This is achieved by measuring the difference in temperature across the heat pipe and another conductor made of the same material and size. The temperature measurement for both the pipe and conductor is done under identical thermal conditions.

Apparatus

- Copper-water heat pipe – The specimen whose thermal conductivity is to be found. It is represented in Figure 1.
- Solid Copper Wire – The reference material of same size.
- Thermocouple (quantity – 3) – Temperature measuring instrument (analogue).
- Multi-channel digital thermometer – Temperature measuring instrument (digital) Continue reading...

Abstract

The assessment of respiratory functions is mandatory in the diagnosis of lung diseases and related disorders. These functions are assessed by measuring the lung volumes and capacities. In the present experiment, we learnt the use and operation of BIOPAC airflow transducer for measuring the lung volumes. We understood the rationale behind the precautions taken while experimentation. We could successfully correlate the obtained results with the physiological conditions of the subjects of the study.

Experiment on Respiratory Volumes

Respiratory system is a vital system of human physiology. It is involved with the gaseous exchange wherein oxygen is inhaled and carbon dioxide is exhaled from Continue reading...

English

Introduction
In his article, John Derbyshire wrote about the challenge of improving the children’s academic performance. He documented that a few years ago, New York City Mayor took the Rand Corporation’s service in raising the students of public schools’ examination score by providing cash bonuses for those teachers who will have an improved class. As he continued with his article, Derbyshire used different styles in writing to persuade his readers. Based on his attempts to persuade his audiences, rhetorical strategies were used such as logos, ethos and pathos. However, there were clear manifestations of logical fallacies in Continue reading...

Appeal to the Audience

The report talks about the importance of controller tunings in controlling industrial equipment. According to the report, controller valves are important in controlling the flow rat, the amount of input in machinery and also the amount of output of the machine. The importance of the controllers can be seen in controlling a water cooling machine in which case a slow controller would be inappropriate to be used. The importance of a feedback controller on the other hand is the essence that it enables the determination of an error that may occur between a set point and the process value Continue reading...

Introduction

The purpose of this experiment was to observe collisions between two carts, measure energy changes and classify the collisions. It was hypothesized the momentum would be conserved during the collisions.

- Consider a head on collision between two billiard balls. One is initially at rest and the other moves towards it. Sketch a position vs. time graph for each ball, starting with the time before the collision and ending a shot time afterward
Before collision, ball 2 moves with a constant velocity towards ball 1. Therefore, its position changes with time while the position of ball 1 does not Continue reading...

Abstract

The experiment is aimed at constructing a step-up transformer. This is due to the type of materials being used and the number of rolls that the wire is rolled on the U-shaped material. This can easily be related to the alternating current that is tapped from one source to the other. This current can easily be measured in respect to the size of the voltage that is alternated in between the primary transformer and that of the secondary transformer. The number of coils in the primary material is two; the other secondary coil has four coils. The material used Continue reading...

Article Analysis

Abstract
Introduction
Methods
First, all patients were admitted to the trial wards and those who met the inclusion criteria were considered. Secondly, the members were recommended by ward staff to the study nurses. Thirdly, the entry criteria included; age of 65 years and above; the pressure ulcer risk of 15 to 20 based on physiologic, demographic, and disease specific features and consent to regular examination of pressure areas. Also, the members were transferred to the trial beds after their consent was sought. In addition, the exclusion criteria were employed such as obesity greater than 155 kilograms, if the patient Continue reading...

Methods of Heat Transfer

Conduction
The first method through which heat is transferred from one object to another is conduction. Conduction occurs in liquids and solids through transfer of kinetic energy present in one particle to the immediate particle(s) in its surrounding. By considering the bonds existing between atoms and molecules in solids as elastic links, the vibration of one particle due to increase energy level caused by heat, the next in its line vibrate too. This process is replicated in adjacent particles thereby allowing transfer of thermal energy from a body with a higher temperature as compared to the one with Continue reading...

Ryan Gleason

Salem Almansoori
Introduction
Ballistic pendulum as illustrated in Figure 1 below is a classical method of measuring the speed of bullets. This technique, which is commonly used in investigation of bullet speeds, relies heavily on the basic laws of conservation in physics.
Figure 1 Ballistic Pendulum Set-up
Figure 2 illustrates how the experiment is executed chronologically from the time the ‘bullet’ is launched to the time it ceases travelling at the maximum angular displacement. In the illustration, the bullet of mass, m and initial velocity, v hits a stationary pendulum cup and it is embedded in it to form Continue reading...

There is a time when advertisers need more than descriptive research to understand consumers current behaviors and attitudes. They sometimes require an understanding of cause and effect, which is obtained through experimental research in which an advertiser alters something in the consumer’s environment, or product in order to see what would happen. The goal of an experiment is usually to determine the effect of changes in one area on one or more other areas. An experiment is used to vary the amount of advertising placed in particular markets to determine how advertising weight affects target audience, advertising awareness Continue reading...

1. Abstract
The sodium iodide scintillator detector is a very important type of inorganic scintillators. The main function of this scintillator is to detect gamma rays by interaction of ionizing radiation and the materials of that scintillator. In this experiment, we learned the applications of this detector and how the process of detecting happens.
2. Introduction
This lab experiment is designed to make the student learn about scintillation detectors and how do they detect gamma and beta ray such as the effect of a sodium iodide NaI(Tl) scintillator. This type of detector the scintillation materials interact with ionizing Continue reading...

Research is critical to the advancement of any field, whether it is engineering, medicine or even management. However allowing researchers to conduct experiments without any supervision or without checking in with some regulatory authority might put them and others around them at risk. The premise of this paper is to argue that research regulation is necessary to ensure that civil rights of those involved with the experimental safeguarded.
In the five case studies that were outlines for review, one common factor among them was that in cases when researchers were given freedom to perform experiments they put the results Continue reading...

#90457 1

In 1928, the penicillin was discovered. It was a powerful medicine with numerous possibilities to cure diseases. Doctors all over the world tried to find out new ways of using it. One of the theories stated that the penicillin could treat and prevent the syphilis and other sexually transmitted diseases. In order to prove this theory, the Guatemala Syphilis Experiment was begun.
This experiment took place between 1946 and 1948. It was led and sponsored by the United States Public Health Service under the guidance of the physician John Charles Cutler. The Guatemala Experiment was one of Continue reading...

Abstract

The objective of this experiment is examination of diffraction and interference of visible light when it is passed across narrow double and single slits. In order to do so, the diffraction patterns of light will be investigated through collection of pertinent data relating to the distance between pattern’s centres and maxima. Of particular interest in this experiment is the varying intensity of light and respective positions on the display screen as ascertained trough measurement and calculation of width and separation distances for respective patterns. The experiment concludes by highlighting the wave attributes of visible light as manifested in Continue reading...

Abstract

All cells in a living organism require energy to drive various cellular activities such as transport of molecules and movement among others. The rate of cellular respiration may be affected by the substrate concentration, pH level and enzyme concentration among other factors. This experiment aimed to study the rate of cellular respiration in isolated mitochondria under different conditions. It was hypothesized that if the concentration of the substrate is increased then there will be an increase in the rate of cellular respiration. Mitochondrial suspension was used as the source of succinate that was used as the substrate. The level Continue reading...

- Anthropology by definition is the study of human beings present and past life with an intent of deducing ways of evading problem and ensure development of the human population.
- In respect to the main objective of anthropology research done in this field ought to ensure that humane methods of conducting the same are well adhered to.
- Conflicting to what ought to be the essence of anthropological research are the presentation of inhuman experiments, one example of this is that of Guatemala that entailed using prisoners as subjects for testing the effectiveness of penicillin in treating syphilis.
Continue reading...

Abstract

A polymerase chain reaction also known as PCR refers to a technique that is used in the amplification of a DNA fragment making huge numbers of the original fragment. The process uses an enzyme known as DNA polymerase to multiply the DNA fragment. Other components that are necessary for a PCR reaction are the DNA template that is provided by the sample being multiplied, the primers, and nucleotides. The experiment aimed to examine a number of human DNA polymorphisms, the PV92 Alu polymorphism and the mitochondrial control region using human DNA. This was achieved by isolating the mitochondrial DNA Continue reading...

Introduction

A turbulent jet is a source of energy and momentum in a fluid tank. A jet is considered fully turbulent at a jet laminar for Rej below about 100 and Reynolds number Rej above about 1’000 – 2’000. Therefore, the limit between a turbulent jet and laminar is around the Reynolds number of 3’000 and the significant characteristics of the jet are its discharge and momentum flux.

Eq. 2; Qj = vjAj – jet volume flux
Rej = vjdjv = jet Reynolds number
Frj = vj√g'dj = densimetric jet Froude number

Where;

Vj is the jet velocity at entry point
Aj is the Continue reading...

Introduction

The purpose of this experiment was to verify Newton’s second law of motion. The force and acceleration data was collected by Logger Pro for a cart moved back and forth. This data was used to analyse the relationship between force, acceleration and mass. It was hypothesised that the acceleration would directly be proportional to applied force but inversely proportional to the mass of the cart.

- When you push on an object, how does the magnitude of the forces affect its motion? If you push harder, is the change in motion smaller or larger? Do you think is Continue reading...

Introduction

The object of the paper is to analyze the above relationship over a range of pressures extending above and below atmospheric pressure.
Data were obtained for the pressure and temperature of a saturated steam-water mixture in equilibrium over a wide range of pressures and temperatures. The “raw” experimental data are given at the end of this document and the apparatus used are described below.

The object of this exercise is to:

a) Use the raw data to produce a table of absolute pressure .v. absolute (thermodynamic) saturation temperature over the whole range of the data provided.
b) Compare this data to equivalent data taken from steam Continue reading...

Abstract

The present paper examined water quality and contamination. The three experiments were conducted to find the effects of different pollutants on groundwater, processes of water treatment, and quality of bottled water. The contamination of groundwater was observed to evaluate the result of vitiating environment that has to be protected to ensure a safe future for the progeny. Water treatment processes have to be effective as well as economical, so that people in general worldwide can be benefitted. Treatment method like filtration has researched out for the benefit of people at large. Bottled water was analyzed considering safe for drinking. Continue reading...

Abstract

Water is one of the fundamental requirements for any form of living thing on earth. It is known for the many vital roles that it plays in the continued survival of animals and growth of plants. In animals, water plays an essential role in maintaining many processes that take place both in the system of the animal and the outside world as well. Water acts as a medium through which most chemical reactions take place within the body system of all animals. In plants, it plays several roles, mainly by allowing the absorption of dissolved nutrients and mineral salts Continue reading...

Abstract

This paper is an expository essay on the article” The influence of the feel of product packaging on the perception of the oral-somatosensory texture of food” presented by Betina Piqueras-Fiszman a,b,, Charles Spence (2012). Initial sections of the paper covers the expirmenet and method adopted in the article. The Later sections deals with critique and results of the experiment.

Introduction

The research has focused on the multisensory integration regarding the superior colliculus (SC) of the adult neurons (Betina & Spence, 2012). The core emphasis has been on perception of food texture and it also focuses on what may occur inside Continue reading...

Abstract. Oxidation of ethanol is carried out by the oxidizing agent, potassium dichromate. The oxidizing agent undergoes a color change followed by the completion of the reaction. This change of color is utilized to measure the absorbance of the solution. The concentration of the unknown ethanol sample is calculated by plotting an absorbance vs concentration graph of the standard solutions.

Module and group

Lab class completed
- Introduction
The aim of the experiment is to determine the concentration of ethanol by calorimetric determination method. The concentration of ethanol is measured following its oxidation with potassium dichromate. Potassium dichromate (K2Cr2O7) undergoes reduction, which Continue reading...

Sampling is the process of selecting a group of subjects to act as a representation of the entire target group. The selected representative portion of the population is called a sample, and it upon which generalizations of the research findings is done to apply to the whole target population. There is one principal way through which a sample might not be a representation of the entire population. This occurs when randomization is not done during the process of compiling the sample. It should be noted that randomization is the key to building an effective representative sample for the study. Continue reading...

[Institution’s Name]

Methods Online Discussions 2

Example 5.2 Grover's Corner DOT;
Objective;
"Discuss the challenges of determining external validity for one of the case examples presented in this chapter [Chapter 5]. What about the research problem might make the results externally valid? AND, what factors might limit the external validity of the findings?
An analysis to determine the challenges of the external validity over the referred case can be observed from the multiple dimensions of extraneous variable that influence the variables of people, setting, time and places for accurate calculation. In particular, the presented case study, exhibit the readings on the measurement Continue reading...

Centripetal force

PHY 2091-01
Introduction
The purpose for this experiment was to determine the centripetal force acting on a metal bob revolving on a Beck centripetal force apparatus. The mass, radius, and time for completing one rotation were measured and used to calculate the centripetal force. Weight of masses hanged on the metal bob was calculated and used to determine the static centripetal force. Calculated centripetal force and static centripetal force were then compared.

Data

The results obtained from the experiment are shown below:
Data analysis
The calculations are as shown below:
Percent error in radius
Percent error in radius (%σr) = (0.005/0.18)* Continue reading...

Objective

Purpose of this laboratory is to inspect the effect of precipitation hardening in Aluminum and steel alloys.
Theory
Hardness is a property of a material which delineates resistance to permanent or plastic deformation. For metals, hardness is generally defined as the resistance to indentation. One way to attain hardness is to look into the effect of precipitation hardening. This type of hardening helps to detain the yield strength in the material. There are four methods used to test hardness of a material: Rockwell, Brinell, Vickers, and Knoop. The Rockwell hardness test measures the depth of indentation, while the other Continue reading...

Executive summary

Online marketing has with time become the most convenient way of buying and selling merchandise. The online methods of payment are the most lucrative methods to earn cash fast with great ease. This is made possible by the several card companies including Visa and MasterCard. In the modern world, all needed is one to give the card number to the online store upon which funds are deducted, and hence payments made. This method of payment had become the most popular payment method up until other systems, where emails make payments we’re introduced. In the latter system, one needs Continue reading...

Introduction

There are many resemblances that can be observed in magnetic and electric phenomena. A magnet comprised of north and south poles which are opposite to each other. The opposite poles attract and likewise repel each other. A magnet has principle property to influence the surrounding space. This surrounding effect of a magnet is known as a magnetic field.
Magnetic fields consist of lines of force and force of attraction and repulsion that travel/or move along the lines. The developed forces depend on strength and distance apart the poles.
Figure 1: Magnetic lines of force for bar magnet
A magnet Continue reading...

The notion good people change their behaviors when put in an evil environment was experimented by a team of researchers led by Dr. Zimbardo in the infamous Stanford Prison. Twenty- four volunteers were chosen to stay for two weeks in prison where they would be subjected to the harsh prison environment. For their participation, the volunteers who were divided to two groups, the prisoners and the guards would receive $15 a day as compensation (Zimbardo 244). Prisoners underwent extreme punishment, degradation and depression as they wholly started to believe they were actual prisoners. The guards enforced and abused their Continue reading...

The Title of the Article

The title indicates that the article is about morale and role strain of undergraduate nursing students in a pediatric clinical setting. However, Chen fails to specify the aspect of morale and role strain that the article seeks to deal with in the title. For instance, the title would have been more specific if it were stated as follows: causes of morale and role strain of undergraduate nursing students in a pediatric clinical setting. In this case, a reader would be able to tell that the article deals with the causes of morale and role strain. It therefore follows that Continue reading...

Description of a Design of an Experiment

A quasi experimental study is a research which helps to establish whether a certain program has an effect on what the participants are studying. This article will explain the details to be considered so as to have a successful research on the importance and benefits of learning music instruments on child development. The details to be considered are the participants, materials to be used and the procedure to go about through the research.
The first step will be to choose the participants of research and the appropriate number. The participants of the experiments must be in the same course Continue reading...

A Review of a Journal article

What are the key objectives of the study?
The key objective of the study is to guide the reader about all the aspects of the research processes, which mainly includes objective formulation, choosing appropriate research methods, securing participants of the research and data collection, analysis and interpretation.

What is the research problem?

The research problems refer from simple to complex, depending on the nature and number of variables (both dependent and independent) and the nature and relationship between the variables (Bryman, 2012, pp. 3). Once you understand the nature of the problem, it will make you able to develop the result of a specific Continue reading...

A collision refers to a physical situation where kinetic energy of momentum of an object is transferred from an object to the other one. In physics, collisions are classified as either elastic or inelastic. Conservation laws; energy conservation and momentum conservation are important tools in the analysis of collisions. Various literatures and experimental studies have confirmed that it is difficult to assess the interaction of bodies during collision. Therefore, main objective of this work is to demonstrate to relate the various parameters such as velocities and masses of the system using the principle of conservation of energy and momentum.

The momentum of an object of mass, m and velocity, v is represented mathematically as shown below:

Continue reading...

Introduction and Theory

The main aim of this experiment is to investigate energy and momentum conservation in a closed system. Momentum and energy conservation principles are significant physical variables that engineers use when describing various physical phenomenon. Momentum of a body is a vector quantity, which is given by the product of its velocity and mass. In collision theory, the momentum of the body is always conserved when two bodies collide. The principle of momentum conservation applies to both elastic and inelastic conservation irrespective of the dynamic interaction between the two objects. This report demonstrates the application of momentum equation in determination Continue reading...

Group

Abstract
Material selection is an important stage in engineering design. Engineers use various materials with different mechanical properties in building of structures. These mechanical properties include; tensile strength, yield strength, proof stress, Young's modulus, shears modulus of rigidity and ductility amongst others. Material selection increases the performance as well as durability of the engineering component. The expected life, cost, nature of loading and working environment are some of the factors that assist engineers to select materials for particular application. Therefore, engineers and designers must be able to determine the properties of these materials before they use them. Engineers use Continue reading...

Experiment 6

Introduction:
Newton’s laws of motion are very fundamental topic in physics. Motions of a body and force acting on the body to create motion are justified by these laws. In this experiment property of spring is also discussed. Spring is an interesting device which is widely used in daily life. In physics or any experiment related to physics, spring is utilized for its property of storing elastic potential energy.

Objective:

Purpose of this experiment is to be familiar with Newton’s laws of motion.
Theory:
Newton’s second law states that the vector sum of all individual forces acting Continue reading...

This experiment is majorly concerned with investigating on whether or not reducing the fibre and rouphage has a role in preventing the occurrence of certain diseases. In this experiment, subjects were subject to a normal diet for sometime then an additional 16g of wheat bran used to supplement the normal diet each day for a period of 28 days and results noted. It was found that the weight of stool increased whereas the intestinal transit time did not change. On the other hand, bile did not also change but was diluted.

Summary

In an experimental study of the bowel function Continue reading...