Anisotropy of mechanical properties in cold rolled electrical sheets of goss texture

Electrical sheets display beneficial properties and are thus good constructional materials for magnetic circuits of transformers and electrical machines and equipment. The anisotropy of mechanical properties is brought about by sheet crystalline structure and texturing. The phenomenon was analyzed quantitatively. The anisotropy of mechanical properties in cold rolled electrical sheets was correlated with the anisotropy of magnetic and electrical properties.     

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.     

Mitochondrial effects of L-ropivacaine, a new local anesthetic

The effects of the local anesthetics ropivacaine and bupivacaine were investigated on isolated rat liver mitochondria. The efficiency of oxidative phosphorylation was evaluated by measuring the rates of respiration and ATP synthesis and the magnitude of the transmembrane electrical potential (deltapsi). Bupivacaine did not alter the ADP-stimulated respiration but strongly affected the resting respiration, which was more than doubled at 0.6 mM. In addition, it decreased the transmembrane electrical potential, and the ATP synthesis rate (deltapsi was less than 100 mV at 0.6 mM). Ropivacaine did not alter the ADP-stimulated respiration, and the resting respiration seemed to be substantially unaffected up to 1.2 mM; a slight increase was observed at 1.8 and 2.4 mM. The transmembrane potential was decreased by anesthetic concentrations higher than 1.2 mM and ATP synthesis was consequently affected. The findings suggest that ropivacaine is less toxic than bupivacaine, in rat liver mitochondria.     

Treatment of MALT lymphoma of the digestive tract]

Mucosa-associated lymphoid tissue (MALT) is an autonomous part of the immune system with a specific function, histological structure and circulation of cells. As a result of malignant transformation of this tissue maltomas develop, peripheral extranodal non-Hodgkin lymphomas of B-origin more than two-thirds of which are found in the digestive system. The authors investigated in a retrospective study the effectiveness of different types of treatment of maltomas of the digestive tract with a low and high grade of malignity in 16 patients. It appears that splenectomy is not necessary in these patients and that the effectiveness of primary chemotherapy with a view of inducing complete remission of the disease is comparable with surgical treatment and subsequent adjuvant treatment without deterioration of the patient s life by mutilating surgery. An integral part of treatment of gastric maltomas is eradication of infection caused by Helicobacter pylori.     

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)