Fibrocystic disease of breast and pituitary-thyroid axis function

The aim this study was to report findings on the concentrations of mean triiodothyroxine (T3), thyroxin (T4), thyroid stimulating hormone (TSH) and prolactin (Prl) in patients with benign mastopathy and in control group. All of the examined subjects were clinically euthyroid. The mean T4 concentrations in women with mastopathy (78.25 +/- 15.27 ng/ml) were significantly lower than in control group 88.73 +/- 15.27). The mean TSH and PRL concentration in women with mastopathy were higher, but not significantly, than in control women. This results indicate, that benign mastopathy seems to be connected with thyroid functions.     

Effect of coumarin and xanthotoxin on mitochondrial structure,oxygen uptake,and succinate dehydrogenase activity in onion root cells

At concentrations in which they occur on the plant surface and retard mitosis, coumarin and xanthotoxin lowered uptake of oxygen (by 60 and 30%, respectively) by meristematic cells ofAllium cepa root tips. They caused changes in the structure of the mitochondrial matrix to become dense, and protrusions of mitochondrial membranes were visible parallelling their hypertrophy, indicating alteration in the structure and physiology of these organelles. Coumarin and, to a lesser extent, xanthotoxin increased succinate dehydrogenase production in mitochondria and also in the cytoplasm, indicating changes in membrane permeability. Changes in oxygen uptake and mitochondrial structure, in addition to the retardation of mitosis, may be the reason these compounds act as allelochemicals after they have been removed from the plant surface and reach the root meristem.     

Reoptimization of the Shortest Common Superstring Problem

A reoptimization problem describes the following scenario: given an instance of an optimization problem together with an optimal solution for it, we want to find a good solution for a locally modified instance.     

Der Einfluß der Silikatphase auf die Eigenschaften von Eisenerzsintern

Schrifttumsübersicht. Herstellung synthetischer Olivine. Ermittlung des kristallchemischen Aufbaues. Thermo-Differentialanalyse. Eigenschaften der synthetischen Kalziumolivine. Auftreten von Kalziumolivinen in Sintern. Einfluß der Silikatphase auf die Sintereigenschaften.     

Druckverformungen an Vollholz und geschichteten Holzkörpern

Test specimens of solid beech wood and build up of differently directed beechwood layers were subjected to an increasing pressure up to 30 N/mm². The reductions in height, resulting therefrom, were determined. The dependence of these reductions on the original height as well as on the angle of fiber direction between the layers and the layer thickness is discussed.     

Der Einfluß von Bariumoxid auf die Zähigkeit von Hochofenschlacken

Messung der Zähigkeit der Hochofenschlacken mit einem Massengehalt von 0 bis 14% BaO. Änderung der Aktivierungsenergie des viskosen Fließens mit steigendem Anteil an Bariumoxid. Veränderungen der Schlackenstruktur sowie Entmischungen und Abweichungen der chemischen Zusammensetzung in Mikrobereichen bei Erhöhung der Bariumoxidgehalte.     

Modelling and effective modification of smooth boundary geometry in boundary problems using B-spline curves

To create curves in computer graphics, we use, among others, B-splines since they make it possible to effectively produce curves in a continuous way using a small number of de Boor’s control points. The properties of these curves have also been used to define and create boundary geometry in boundary problems solving using parametric integral equations system (PIES). PIES was applied for resolution 2D boundary-value problems described by Laplace’s equation. In this PIES, boundary geometry is theoretically defined in its mathematical formalism, hence the numerical solution of the PIES requires no boundary discretization (such as in BEM) and is simply reduced to the approximation of boundary functions. To solve this PIES a pseudospectral method has been proposed and the results obtained were compared with both exact and numerical solutions.     

Safety aspects in modelling and operating of batch and semibatch stirred tank chemical reactors

Safety aspects in modelling of batch and semibatch stirred tank reactors as well as a model based safety analysis have been considered. Applicability of two basic types of models – i.e. the perfectly mixed reactor model and the CFD model, both formulated for laboratory scale as well as pilot plant scale reactors – has been discussed. A formulation of the appropriate reactor model, which is adequate to the considered case study has been demonstrated and tested experimentally. Particular attention has been devoted to the formulation of robust CFD models employed to simulate a performance of the stirred tank reactors. It has been found that models for perfectly mixed reactors may have quite wide range of application, while the CFD models should be definitely used in case of fast reactions, high viscosity of the reacting mixture as well as of failure leading to stopping of the impeller. The CFD models are able to predict a dynamic behaviour of reactors at any circumstances, so they can play a significant role in safety analysis carried out for industrial scale reactors, for which experimental safety tests are expensive and dangerous.