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51.
52.
G. Irena 《Soil Mechanics and Foundation Engineering》1995,32(5):147-152
The dynamic contact problem is solved by a method based on use of static determination of the stresses beneath a plate and
additional slab. The static mixed edge problem is reduced to the solution of integral equations, and then to determination
of the normal stresses on the contact boundary. A sample calculation confirms the effectiveness of reducting vibration by
joining slabs to the basic foundation.
Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 5, pp. 2–6, September–October, 1995. 相似文献
53.
Irena Kuchaíkov 《应用聚合物科学杂志》1979,23(10):3041-3049
54.
The coking process of vitrites and thermobitumens separated from vitrites was examined; structural X-ray and microscopic examinations of the cokes obtained were carried out. A correlation between reflectance distribution of vitrites and microscopic structure of their cokes was found.An increase in the structural ordering of the cokes from vitrites, passing from cokes of gas coal to cokes of orthocoking coals, is observed. It is accompanied by an increase of the optical anisotropy of the resultant cokes; this anisotropy first appears in coke from gas-coaking coal.The cokes from the thermobitumens are lower ordered than the cokes from parent vitrites but all these cokes are partially or entirely optically anisotropic.Total removal of the thermobitumens from coals deprives the cokes from the residues after the extraction of any optical anisotropy. 相似文献
55.
Bla?enka ?ebe?i? Irena Vedrina-Dragojevi? 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1992,194(2):144-147
Summary The simple fluorometric method for determination of added pyridoxine-HCl in enriched food, based on oxidation of pyridoxine to 4-pyridoxic acid by means of KMnO4, has been modified for determination of total B6 in soya bean. In comparison to the other fluorometric procedures, the proposed method is the simplest one, rapid and easy to perform, demanding the least time for oxidation and not using hazardous chemicals (KMnO4 instead of KCN). Good recovery, low relative standard deviation and low total error allow the proposed procedure to be included into the group of excellent methods.
Die fluorometrische Methode zur Vitamin B6-Bestimmung in Soja
Zusammenfassung Die einfache fluorometrische Methode zur Bestimmung von zugegebenem Pyridoxin in angereicherten Lebensmitteln basiert auf der Oxidation des Pyridoxins mit Kaliumpermanganat zur 4-Pyridoxinsäure und wurde für die Bestimmung des gesamten Vitamin B6 in Soja modifiziert. Im Vergleich mit anderen fluorometrischen Methoden ist die vorgeschlagene, einfach, schnell und leicht durchzuführen. Diese Methode braucht nur wenig Zeit für die Oxidation und verwendet ungiftige Chemikalien (KMnO4 statt KCN). Die gute Wiederfindung, die geringe relative Standardabweichung und der geringe Gesamtfehler reiht das vorgeschlagene Verfahren in die Gruppe der ausgezeichneten Methoden ein.相似文献
56.
57.
Irena Langowska 《Water research》1982,16(2):161-167
Studies showed that synthetic phosphates of a surface active nature may become a source of carbon and energy for the Bacillus licheniformis. Bacillus mycoides, Bacillus cougulans and Azotobacter agilis bacteria in spite of the fact they are hardly oxidizable. In addition, it was found that these compounds may also become a source of phosphorus for the Scenedesmus obliquus alga which proves that these algae contain suitable phosphatases permitting utilization of a specific organic compound. 相似文献
58.
Larsson S Svensson R Gudowska I Ivanchenko V Brahme A 《Radiation protection dosimetry》2005,115(1-4):503-507
A new thin transmission target technique for fast dose delivery using narrow scanned photon beams has been developed. High-energy, 50-100 MeV, electron beams of low emittance incident on thin low-Z targets produce narrow and intense high-energy bremsstrahlung beams. However, electrons transmitted through the target are bent from the therapeutic beam by a purging magnet and have to be effectively absorbed in a dedicated electron collector. The electron-photon transport through a treatment head has been studied using the Monte Carlo simulation toolkit Geant4. The Geant4 electromagnetic physics processes have been compared with experimental data of radial dose profiles. The differences between calculated and measured radial dose distributions are approximately 2-10%. Preliminary investigations of the collector design have been carried out in order to minimise secondary electron and photon contamination of the therapeutic beam. The toolkit presented here is promising for further development of narrow photon beam therapy. 相似文献
59.
Stefan Vieths Werner Blaas Manfred Fischer Christian Krauses Reinhard Matissek Irena Mehlitz und Rudolf Weber 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1988,186(5):393-397
Zusammenfassung Lebensmittel, die im Emissionsbereich Chemischer Reinigungen gelagert bzw. verkauft werden, können erheblich mit Tetrachlorethen belastet sein. Hohe Tetrachlorethengehalte wurden sowohl in Lebensmittelproben aus über Chemischen Reinigungen gelegenen Wohnungen als auch in Proben aus dem Lebensmitteleinzelhandel festgestellt. Lebensmittel mit hohem Fettgehalt wiesen stets die höchsten Kontaminationen auf.
Contamination of foodstuffs by emissions from dry cleaning units
Summary Tetrachloroethene (perchloroethylene) from dry-cleaning units may contaminate adjacent flats in the same building. Increased concentrations of tetrachloroethene have been found in foodstuffs in homes situated above dry cleaning units and in foodstuffs from groceries located neat drycleaning units. The concentrations were extremely high in foods rich in fat.相似文献
60.