Distribution of chemical composition of statistical copolymers from the conversion dependences of copolymer or residual monomer mixture composition

1986 ◽  
Vol 19 (6) ◽  
pp. 1575-1580 ◽  
Author(s):  
Jaroslav Stejskal ◽  
Pavel Kratochvil ◽  
Dagmar Strakova ◽  
Ondrej Prochazka
Keyword(s):  
Chemical Composition ◽  
Mixture Composition ◽  
Monomer Mixture ◽  
Residual Monomer

scholarly journals Volume contraction in the process of combustion of various fuels in combustion engines

2013 ◽  
Vol 154 (3) ◽  
pp. 72-78
Author(s):  
Barbara WORSZTYNOWICZ
Keyword(s):  
Chemical Composition ◽  
Theoretical Calculations ◽  
Combustion Process ◽  
Mixture Composition ◽  
Combustion Engines ◽  
Volume Contraction ◽  
Gaseous Fuels ◽  
The Individual

The paper discusses the issues related to the change of volume of the reagents during the process of combustion. The formulas that were necessary to make the calculations were derivedfor liquid and gaseous fuels. Based on the formulas, theoretical calculations of the change of the kilo-mole number for various fuels depending on the mixture composition were performed. The results of the calculations were presented in the tables. Further, the influence of volume contrac­tion on the parameters of the combustion process was analyzed. In the conclusions, a comparison of the influence of the previously described phenomena on the individual fuels was performed in relation to their chemical composition and the composition of the mixture.

Influence of the Monomer Mixture Composition on Acrylate Membrane Properties

2000 ◽  
Vol 352 ◽  
pp. 201-206
Author(s):  
A. Nastasović ◽  
V. Laninović ◽  
M. Stanković
Keyword(s):  
Mixture Composition ◽  
Membrane Properties ◽  
Monomer Mixture

scholarly journals Influence of activators on constitutes of diffusion layer at boronizing pressed samples from iron powder

2008 ◽  
Vol 62 (3) ◽  
pp. 164-169 ◽  
Author(s):  
Emina Pozega ◽  
Svetlana Ivanov
Keyword(s):  
Experimental Investigation ◽  
Chemical Composition ◽  
Iron Powder ◽  
Ammonium Chloride ◽  
Diffusion Layer ◽  
Potassium Fluoride ◽  
Mixture Composition ◽  
Ammonium Bifluoride ◽  
Mathematical Processing ◽  
Quantitative Changes

In this paper, results of experimental investigation which contributes to study of quantitative changes of porosity during chemical-thermical process, apropos boronizing of pressed samples from iron powder, with variation of boronizing mixture composition are presented. The basic mixture is modified by the addition of activators with different chemical composition and in different percentage rate (0-4 wt%). Mixtures with ammonium chloride, ammonium bifluoride and boron potassium fluoride were investigated. According to the results of the experiments it is found that the content of activators has an influence on the porosity of pressed samples from iron powder. In order to obtain better boride layers it was necessary to choose a mixture for boronizing and to determine the most useful activators and their ratio. The results of research and mathematical processing enable the choice of optimal mixture composition for boroning. .

Hydrophilic sponges based on 2-hydroxyethyl methacrylate. I. effect of monomer mixture composition on the pore size

1993 ◽  
Vol 32 (3) ◽  
pp. 221-232 ◽  
Author(s):  
Traian V. Chirila ◽  
Yi-Chi Chen ◽  
Brendon J. Griffin ◽  
Ian J. Constable
Keyword(s):  
Pore Size ◽  
Mixture Composition ◽  
Hydroxyethyl Methacrylate ◽  
Monomer Mixture

The Origin of the Moon

1962 ◽  
Vol 14 ◽  
pp. 149-155 ◽  
Author(s):  
E. L. Ruskol
Keyword(s):  
Chemical Composition ◽  
Solar System ◽  
The Moon ◽  
The Earth ◽  
The Difference ◽  
Origin Of The Moon

The difference between average densities of the Moon and Earth was interpreted in the preceding report by Professor H. Urey as indicating a difference in their chemical composition. Therefore, Urey assumes the Moon's formation to have taken place far away from the Earth, under conditions differing substantially from the conditions of Earth's formation. In such a case, the Earth should have captured the Moon. As is admitted by Professor Urey himself, such a capture is a very improbable event. In addition, an assumption that the “lunar” dimensions were representative of protoplanetary bodies in the entire solar system encounters great difficulties.

On the Inhomogeneity of Chemical Composition over the Surface of 21 Per

1976 ◽  
Vol 32 ◽  
pp. 343-349
Author(s):  
Yu.V. Glagolevsky ◽  
K.I. Kozlova ◽  
V.S. Lebedev ◽  
N.S. Polosukhina
Keyword(s):  
Chemical Composition ◽  
Spectral Line ◽  
Variable Star ◽  
Radial Velocities ◽  
Crimean Astrophysical Observatory ◽  
Line Intensities ◽  
Magnetic Variable

SummaryThe magnetic variable star 21 Per has been studied from 4 and 8 Å/mm spectra obtained with the 2.6 - meter reflector of the Crimean Astrophysical Observatory. Spectral line intensities (Wλ) and radial velocities (Vr) have been measured.

Structural Studies on Mitotic Spindle Fibres

1978 ◽  
Vol 36 (3) ◽  
pp. 615-626
Author(s):  
J.R. Mcintosh
Keyword(s):  
Chemical Composition ◽  
Mitotic Spindle ◽  
Structural Studies ◽  
Mitotic Apparatus ◽  
Chemical Studies ◽  
Medical Interest ◽  
Spindle Fibres

The mitotic apparatus is a structure of obvious biological and medical interest, but it has proved to be a difficult cellular machine to understand. The chemical composition of the spindle is only slightly elucidated, largely because of the difficulties in preparing useful isolates of the structure. Chemical studies of the mitotic spindle have been reviewed elsewhere (Mcintosh, 1977), and will not be discussed further here. One would think that structural studies on the mitotic apparatus (MA) in situ would be straightforward, but even with this approach there is some disagreement in the results obtained with various methods and by different investigators. In this paper I will review briefly the approaches which have been used in structural studies of the MA, pointing out the strengths and problems of each approach. I will summarize the principal findings of the different methods, and identify what seem to be fruitful avenues for further work.

Effects of 5-5'-Diphenyl-2-thiohydantoin (DPTH) and Thyroxine on the Ultrastructure and Chemical Composition of Rat Liver

1971 ◽  
Vol 29 ◽  
pp. 570-571
Author(s):  
E. A. Elfont ◽  
R. B. Tobin ◽  
D. G. Colton ◽  
M. A. Mehlman
Keyword(s):  
Chemical Composition ◽  
Rat Liver ◽  
Future Study ◽  
Mode Of Action ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Effective Inhibitor ◽  
Biochemical Effects ◽  
Glycerophosphate Dehydrogenase ◽  
Stimulation Of

Summary5,-5'-diphenyl-2-thiohydantoin (DPTH) is an effective inhibitor of thyroxine (T4) stimulation of α-glycerophosphate dehydrogenase in rat liver mitochondria. Because this finding indicated a possible tool for future study of the mode of action of thyroxine, the ultrastructural and biochemical effects of DPTH and/or thyroxine on rat liver mere investigated.Rats were fed either standard or DPTH (0.06%) diet for 30 days before T4 (250 ug/kg/day) was injected. Injection of T4 occurred daily for 10 days prior to sacrifice. After removal of the liver and kidneys, part of the tissue was frozen at -50°C for later biocheailcal analyses, while the rest was prefixed in buffered 3.5X glutaraldehyde (390 mOs) and post-fixed in buffered 1Z OsO4 (376 mOs). Tissues were embedded in Araldlte 502 and the sections examined in a Zeiss EM 9S.Hepatocytes from hyperthyroid rats (Fig. 2) demonstrated enlarged and more numerous mitochondria than those of controls (Fig. 1). Glycogen was almost totally absent from the cytoplasm of the T4-treated rats.

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

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