Null hypothesis: Daphnia don't have affinity towards light. 2) Hypothesis: Daphnia shows prefernce towards a particular colour of light. Null hypotheisis: Daphnia shows no preference towards a particular colour of light. Methodology: Hypotheises-1: Fourty daphnia will be collected form a water pond as sample space. Mean time fram will be deciided after allwing them to reach one of the ends of samll y- shaped open box.
As with splitting any pipework, ensure it is not under pressure before doing so. 2. Describe the importance of wearing appropriate protective clothing and equipment, and keeping the work area safe and tidy Correct protective clothing is essential. It will protect you from any workplace hazard associated with your task. Anything outside of the mandatory site PPE will be detailed on the work permit.
The string is tied onto a thin metal bar at A and fixed at B. A vibration generator causes the bar to oscillate at a chosen frequency. Explain how a stationary wave is formed. Then describe the key features of the stationary wave shown in Figure 4. * Waves reflect off the clamp and the rod * Waves travelling in opposite directions superpose * Waves have same wavelength and frequency, similar amplitude * Always cancellation at nodes and constructive superposition at antinodes * Energy is not transferred along string * 4 nodes where there is zero amplitude * 3 antinodes where amplitude is maximum * Wavelength 0.80m * End antinodes in phase and middle and ends in antiphase * Between node and antinode, amplitude of oscillation increases On her next jump the gymnast decides to reach a height above position B.
Lab 2 Report: Water Quality and Contamination Kristy Vasquez SCI 207: Dependence of man on the environment S. Tuckerman 01/12/2015 Clean Water Experiments The background of water quality and related issues can go back as far as the Clean Water Act. The objective of the Clean Water Act is to restore and maintain the chemical, physical, and biological integrity of America’s waters and their systems. Under Section 303(d) of the Clean Water Act, states, territories, and authorized tribes, referred to as an act of the state, are to publish lists of impaired waters. These waters therefore are technology based rules and are not harsh enough to meet the water quality standards set by the states. (http://water.epa.gov/lawsregs/lawsguidance/cwa/tmdl/glossary.cfm#section303d) Water quality research is very important to our society.
Introduction Sope Creek is located in Marietta, GA, and is the test site of recent water quality index tests. It contains multiple rapids that are rated up to Class III. However, Sope Creek is rather shallow, with an average depth of only about two feet. (U.S. Geological Survey, 2011) Our test site was about the same, at a depth of one foot. The water quality index is made up of multiple tests that include the following: pH, Turbidity, Temperature, Dissolved Oxygen, Nitrates, Phosphates, Total Solids, Fecal Coliform Bacteria, and Biological Oxygen Demand.
Make sure the rubber stopper is securely in place since gas can easily leak out. Collecting the gaseous product: Prepare the gas collection bottle by positioning the bottle so that its mouth is. directly over the hole at the bottom of the trough; this is where the gas will enter the bottle. After the reaction, slide a square of glass over the mouth of the bottle while the bottle is still under water. Keeping the glass fixed to the mouth, raise the collection bottle and invert.
Conditions that must remain constant in this experiment include the temperature of the water baths and the volume of peas and beads in the respirometers. The general gas law states that if temperature and volume remain constant, then the pressure of the gas will change in proportion to the number of molecules of gas present. 2. Water moves into the respirometer pipettes because as oxygen is consumed by the peas, the pressure within the pipettes will decrease and thus the negative pressure will draw the water into the pipette. It is important to correct the readings from the peas because the glass beads are used as a control in which no changes should occur in CO2 and oxygen levels due to their abiotic nature.
Use of trays for fiber optic installation: Cables in ducts and trays are not subjected to tensile forces. But for vertical runs, this must be carefully designed to minimize the tensile force applied to the vertical run fiber cables. Long vertical runs must be clamped at intermediate points to prevent excessive tensile loading on the fiber cable. The clamping force should be applied over as long a length of the fiber optic cable as practical. One major consideration when planning cable duct and trays is the bending radius, the bends must have smooth curves.
Variables Independent | Dependent | Controlled | Concentration of sucrose | Water absorbed by the membrane | Time | | | Temperature (0-45 min) | | | Kind of membrane | We need to keep the controlled variables all the same for the experiments to make sure that the results we obtain are not because of those variables. The variables were controlled during this experiment by the following order: the
This makes it possible to equate the expansion of the reservoir fluids upon pressure drop to the reservoir vodage caused by draw of oil, gas, and water minus the water influx. Successful application of this method requires an accurate history of the average pressure of the reservoir. As well as reliable oil –gas and water –production data and (PVT) data on the reservoir fluids, if sufficient pressure and production performance data are recorded and (PVT) data describing the reservoir fluid behavior is available. The amount of oil or gas in place in a reservoir sometimes may be the computed by material balance