Maximal and minimal solutions,effectiveness factors for chemical reaction in porous catalysts

A chemical reaction in a porous catalyst particle is considered. It is shown that in both the isothermal and non-isothermal cases, with either Dirichlet or third kind boundary conditions, two sequences of functions can be obtained, one of which converges to the maximal solution and the other to the minimal solution. Corresponding to these two sequences of functions, two sequences of numbers, which converge to the maximal and the minimal effectiveness factors, can be obtained. It is shown that in the isothermal case, the maximal (minimal) solution has the minimal (maximal) effectiveness factor while in the non-isothermal case, the maximal (minimal) temperature solution has the maximal (minimal) effectiveness factor. Two numerical examples are given to illustrate the results.     

Immobilization of Uranyl Schiff Base in Mesoporous MCM-41

A uranyl Schiff base complex [UO₂{ OC₆H₄N = C(H)C₆H₄O} H₂O] has been immobilized inside the periodic mesopore channels of MCM-41 by the impregnation route. The samples have been characterized by XRD, N₂ adsorption/desorption, TG-DTA, DR UV-vis, ²⁹Si MAS NMR and FTIR techniques. While the host is found to retain its structural integrity, the surface area and the pore volume decrease considerably as a result of the intrapore confinement of complex molecules. The spectroscopy results indicate that the complex molecules are anchored with the silanol groups of MCM-41 via hydrogen bonding.     

Studies on the Light Stability of Flordipine Tablets in Amber Blister Packaging Material

Accelerated light conditions have been used in the evaluation of light stability of flordipine tablets. The tablets were subjected to exaggerated light exposure in a fadeometer and to 150 foot candles of fluorescent light in a light cabinet. A comparative study was conducted between tile tablets exposed directly to light and to those covered with amber vinyl sheeting. The color change was evaluated by a tristimulus colorimeter using the Hunter L, a, b scale. The b coordinate was selected for the final evaluation of light stability since it corresponded closely to the visual increase in yellowness with time. The data demonstrated that the amber colored vinyl sheeting had an excellent protective effect on the discoloration of flordipine tablets. Data obtained in the fadeometer in six hours as well as results from exposure in the light cabinet for twenty-nine days, facilitate the comparative evaluation of light stability of flordipine tablets. One hour's exposure to fade oneter was found to be equal to 480 hours in fluorescent light     

Incentive system for coders in medical records

Micro-level incentive Systems correlate operator speed & quality to compensate in a piece-rate environment. Since quality and speed are difficult to measure in hospitals, micro-level incentive schemes are difficult to develop. However, due to a high turnover and low productivity level of coders in the Medical Records Department at Georgetown University Hospital, it became apparent that an incentive system would be the only feasible solution to the problem.

In the Incentive System, quality of each chart is tested using 25 indicators, each of which have been assigned weights. The weights were developed using a software package called “Expert Choice”. A Double Sampling Plan is used to determine the size of the sample to be inspected for quality.

The speed requirements for the System were assessed via a survey conducted in the Coding section of the Medical Records Department to collect relevant information on each chart which included the financial class, length of stay (LOS) and time to code. This data was analyzed using a SAS package to identify any significant relations between the experience of the coder at GUH, LOS of patient/chart and time to code a chart for the two financial classes third party payors -- federal and non- Federal (Medicare & Medicaid and all others resp.) It was determined tat the time to code a chart varies with the LOS of the chart in each financial class and the experience of the coder at GUH.

An initial analysis identified a “pure” Incentive System--one in which the speed varied proportionately with operator's pay. However, it was decided to develop a hybrid plan. This plan would pay a coder 100% of base pay if the performance of the coder was within acceptable levels of the prescribed standards; 100% of base pay plus incentive pay if the performance was above prescribed standards and 100% of base pay with disciplinary action for performance below acceptable levels of standards

It is hoped that the proposed Incentive System will not only attract and retain qualified Coders to GUH, but also enhance the overall productivity of the Coding Section. A microcomputer based software package as been developed to accurately administer the Incentive System.     

Metal oxide-polymer thermistors

Composites consisting of semi-crystalline or amorphous polymers and a conducting metal oxide filler, V₂O₃, have been prepared. They exhibit relatively low room temperature resistivities, (PTC) of resistance effects of up to nine orders in magnitude, and an NTC transition near –100' C. A previously proposed model that describes the resistivity behaviour of metal-insulator composites as a function of both temperature and filler concentration has been applied to V₂O₃-polyethylene and V₂O₃-rigid epoxy composites. The predictions of this model are then compared with the experimental behaviour of the composites. In addition, SEM micrographs of the composites are shown to illustrate the wetting characteristics of the various polymers on V₂O₃.     

Effect of Temperature on Performance of 5-nm Node Silicon Nanosheet Transistors for Analog Applications

Silicon - This work investigates the effects of temperature on the performance of a 5-nm node N-channel Nanosheet Transistor (NST) for analog applications. A fully calibrated commercial TCAD...     

An analysis of UK retailers’ initiatives towards circular economy transition and policy-driven directions

Clean Technologies and Environmental Policy - Circular economy is a widely discussed topic in the field of industrial renovation and environmentally responsive economies. The current economic and...     

Area and power delay product efficient level restored hybrid full adder (LR-HFA)

Analog Integrated Circuits and Signal Processing - Full adder circuit is a ubiquitous building block in VLSI systems and application specific integrated circuits. This article presents an area and...