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1. A company, Polycoat, offers a service to orthopedic companies in which they apply a polymer coating, 100 nm thick, to cobalt-chromium alloy prostheses. The coating contains calcium phosphate particles, 10 nm in diameter. The putative benefits of the coating are: 1) bone will bond to it and 2) water absorbed by the polymer will slowly dissolve the particles thereby releasing calcium, which will favorably affect nearby osteoblasts. You have been hired by an orthopedic company to help them analyze Polycoat-coated prostheses and review data from Polycoat. a) It is important to verify that the calcium phosphate particles are within 5 nm of the surface of the Polycoat coating. Given that you can employ only one of the following methods which would you chose and what would you measure: infrared spectroscopy, ESCA, X-ray diffraction? Explain. b) In reference to the hydrophobic-hydrophilic character of the coating, Polycoat determined the contract angle of water on the surface of the coating. What information would you request about the conditions under which the contact angle measurement was made? What type of contact angle measurement would you require for this coating? 2. The silicone elastomer used to fabricate breast prostheses is normally filled with noncrystalline silica particles, 2 nm in diameter, to give it strength. A question has been raised about whether such particles are actually in a sample of the prosthesis given to you for study. Comment about the appropriateness of each of the following methods for determining if such silica particles are in your sample. a) Scanning electron microscopy b) Transmission electron microscopy c) X-ray diffraction
In the beginning of class, we started talking about debt. The word debt is a monetary idea that gets along with money. Along with Graeber, debt is a state of money that is owed to a bank.
Which one of the following is a good example of "cause-related" marketing?
read the following study and answer the questions asked.-in an attempt to determine which method would assure the best
Although modeling provides valuable insight to decision makers, decision making remains a difficult task. Which of the following is not a primary cause for this difficulty discussed in the Decision Analysis chapter?
choose two 2 poems by different authors from the harlem renaissance. write an essay that1. describes each authors role
Furthermore it has also been noted that, there is already distrust between other agencies, on their use of information, accountability, liability exposure concerns, security clearance and classification issues. How would you suggest we handle some of..
Review two research based journal articles on the topic of choice, distinguishing them in relation to how research has been performed and reported. What learning do you draw from them?
How does our visual system make inferences about regularities in our environment?
So, why do we buy such luxurious devices? What cell phone applications do you think are essential for employer sponsored cell phones?
Describe the difference between the standard and modified Proctor tests. Describe the S = 100% curve (zero air voids) and why it is important to the evaluation of compaction data.
Determain if hacking into a web site is ever justifiable, applying your theory to a real-world case in which someone hacked into a system, including the name of the company and details.
All of the following statements regarding equity securities are True except:
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