Cooper received a Bachelor of Science and Doctor of Medicine at The University of Oklahoma and a Master of Public Health from Harvard University School of Public Health.
Answer:
90
Explanation:
mean is basically taking the sum of all numbers and then dividing the sum with the number of all given numbers..
here, the mean is 9, total numbers are 10.. so the sum will be 9 multiplied by 10, that is 90.
Explanation:
Polymer degradation is a change in the properties of the polymer – such as tensile strength, color, shape, molecular weight – or of a polymer-based product under the influence of one or more environmental factors, such as heat, light, chemicals, or any other applied force.
- <em>Photoinduced degradation:</em> Electromagnetic waves with the energy of visible light or higher, such as ultraviolet light, X-rays and gamma rays are usually involved in such reactions.
- <em>Thermal degradation:</em> Chain-growth polymers can be degraded by thermolysis at high temperatures to give monomers, oils, gases and water. This kind of degradation can happen by pyrolysis, hydrogenation or gasification:
- <em>Chemical degradation:</em> it can happen through many mechanism such as oxidation, ozone cracking, galvanic actior or Chlorine-induced cracking
- <em>Biological degradation:</em> by microorganisms to give lower molecular weight molecules
In the case of ceramics, environmental factors are the major cause. There are several ways in which ceramics break down physically and chemically
- <em>Physical degrdation:</em> from mishandling, impacts and abrasion, frost and mold growth
- <em>Chemical degradation:</em> because of water and soluble salts
I hope you find this information useful and interesting! Good luck!
Answer:
As soon as the material that is molded contacts the mold in the injection operation, it begins to cool and solidify. For this reason the injection must occur quickly, so that the cavity is filled while the material is molten. This is achieved with a high injection pressure since the compound is very viscous, despite the high temperatures. The molten material must overcome the resistance offered by friction, in the nozzle and cavity, which could not be done if the pressure is lower than required, preventing the proper filling of the mold.
If the injection pressure inside the mold is higher than the appropriate one, it exceeds its closing force, the partition line of the mold is forced to open; allowing the molded compound to escape from the cavity (resulting in burr and additional work is required in order to eliminate it).
Answer:
Accuracy basically refers to closeness between the measured value to the actual and standard value is known as accuracy. In the mathematics and engineering the accuracy basically tells that the nearest measurement value with reference to the actual true value.
According to the International organization of standardization (ISO), the accuracy referring to the consistent and true results.
Precision basically refers to the value whose results is consistent when the measurement are repeated more than two times. Precision value may be different from one another because of the occurrence of random error in the form of the observational error.