New method of view factor calculation in radiative transfer

The method of view factor calculation presented in this article is based on the methods of analytical geometry. The given method can be used when the surfaces are separated by non-absorbing gas and radiation from the surfaces, whether emitted or reflected, is diffused.     

Influence of load-non-uniformity and eccentricity on the stability and load carrying capacity of orthotropic tubular columns of regular hexagonal cross-section

The paper contains an analysis of the influence of non-uniformity and eccentricity of compressive loads on global and local buckling, on interactive buckling, and on the load-carrying capacity of thin-walled columns. Isotropic and orthotropic tubular columns of regular hexagonal cross-section have been examined. Equilibrium equations for the first and the second order non-linear approximation have been solved using the asymptotic Byskov–Hutchinson method. Numerical calculations have been performed for numerous different loading modes of isotropic columns and also for several loading modes of orthotropic columns. The results are presented in diagrams with some conclusions.     

Studies on oxidation of precursor carbon fibres of petroleum pitch by gas chromatography

Volatile products of precursor carbon fibres of petroleum pitch oxidized in oxygen were investigated. Concentration changes in CO, CO₂, and H₂O as a function of temperature and oxidation time were determined quantitively by gas chromatrography. The oxidation of precursor pitch fibres is the most efficient in the temperature range between 453–498 K during 2–4 hours.     

Investigation into thin-walled structures at the technical University of ódź

The behaviour of thin-walled structures has been a very important area of research activity in the Department of Strength of Materials and Structures (previously the Institute of Applied Mechanics) of the Technical University of ódź in Poland for over 30 years.The investigations concerned many kinds of thin-walled structures: plates of different shapes including trapezoidal and circular, girder and column structures composed of flat plates, cylindrical and conical shells, and composite multi-layer structures subjected to a variety of load types.The analyses included buckling and post-buckling behaviour, assessment of ultimate loads and the behaviour of the structure in post post failure range. This necessitated usage of the theory of elasticity and elasto plasticity in the constitutive relations describing phenomena of the materials behaviour. All the works done at our Department resulted in a number of papers and books, achieved academic degrees and titles (PhD, DSc, Professor). They were also presented in numerous conferences, symposia and seminars.It is our academic duty and a pleasure to mention that for about 20 years we have been accompanied in our thin-walled research activity by our sister unit from the University of Strathclyde-the Department of Mechanical Engineering. Some of our achievements would not be possible without this valuable collaboration, which was part of a more general scheme of academic link initiated between our universities almost 30 years ago.     

Withdrawal of maintenance drugs with long-term hospitalized mental patients: A critical review.

The advisability of drug withdrawal has recently become an important issue in light of several effects of long-term drug maintenance, including undesirable side effects, unexplained deaths, mounting costs, problems in drug-state learning and transfer of learning to the nondrug state, and questionable utility. Methodological flaws that pervade the literature on drug withdrawal are discussed. It is argued that the conclusion of the majority of these studies that withdrawal contributes to significant deterioration is not warranted because of frequently repeated design errors. (5 p ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A novel design methodology for extended continuous class-F power amplifiers in wireless applications

Wireless Networks - In this paper, an extended continuous class-F power amplifier (PA) is investigated, designed, and fabricated. The new auxiliary parameter $$left(beta +alpha...     

Involving parents in cancer risk reduction: A program for Hispanic American families.

The authors explored changes in dietary behavior, nutrition knowledge, and parental support among inner-city, low-income, Hispanic American families. Thirty-eight families were randomly assigned to receive a 12-week, culture-specific dietary intervention or be in a control group. Results showed that parental support was related to changes in diet, nutrition knowledge, and attendance for both mothers and children. Dietary behavior changes (e.g., reduction in dietary fat) were seen only in the treatment group. Distribution of health-related pamphlets to the control group may have promoted cognitive changes (e.g., increased nutrition knowledge) seen in this low-literacy sample. Further research is needed to document behavioral changes after ethnic-specific interventions and the maintenance of those changes over time. (PsycINFO Database Record (c) 2010 APA, all rights reserved)