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排序方式: 共有156条查询结果,搜索用时 15 毫秒
1.
Janko Dimitriev Michail Arnaudov Vesselin Dimitrov 《Monatshefte für Chemie / Chemical Monthly》1976,29(21):1335-1343
Studies of glasses and their crystalline products in the TeO2–V2O5 system were made in the 1400–400 cm–1 range. A continuous shift of the V=O-band from 1020 cm–1 to 940 cm–1 was found in the glasses with decreasing concentration of V2O5, as well as a sharp decrease in the intensity at 830 cm–1. On the basis of the results obtained, it is concluded that with increasing TeO2 content, the structure of the glasses is changed, caused by the breaking of the V–O–V bonds and the formation of Te–O–Te bridges.The IR-spectrum of the 2TeO2·V2O5 compound in both crystalline and vitreous states was studied for the first time. The behaviour of the absorption bands is related to the structure of the glasses studied. 相似文献
2.
Vesselin Dimitrov Yanko Dimitriev Vili Mihailova 《Monatshefte für Chemie / Chemical Monthly》1983,114(6-7):669-674
The structure of glasses in the Fe2O3-V2O5 system in the 0–50 mol% Fe2O3 range is studied by IR-spectroscopy. It is found that the introduction of Fe2O3 favours the transformation of the VO5-groups into VO4 ones. This effect may be shown with the aid of IR-spectra, owing to the fact that these glasses are characterized by two high-frequency bands at 1020 and 930 cm–1. The first is determined by the vibrations of the short V=O nonbridging bonds in the VO5-groups, while the second is assigned to the vibrations of the V—O-bonds in deformed VO4-tetrahedra.
IR-spektroskopische Strukturuntersuchung von Gläsern des Systems Fe2O3-V2O5
Zusammenfassung Die Struktur von Gläsern des Systems Fe2O3-V2O5 in dem Bereich von 0–50 Molprozent Fe2O3 wurde mit Hilfe der IR-Spektroskopie untersucht. Zusatz von Fe2O3 begünstigt die Umwandlung der VO5- in VO4-Gruppen. Das kann in den IR-Spektren durch zwei Banden bei 1020 und 930 cm–1 festgestellt werden. Die erste wird durch Schwingungen der kurzen V=O-Nichtbrücken-bindungen in den VO5-Gruppen verursacht, die zweite wird auf Schwingungen der V—O-Bindungen in dem deformierten VO4-Tetraeder zurückgeführt.相似文献
3.
By the method of neutron diffraction, the structural changes in 2TeO2·V2O5 glass, arising as a result of reactor irradiation with ~1018n/cm2 fast neutrons flux are investigated. A reduction of the coordination number of the Te atoms, as well as rupture of a part of the 0-0 bonds is observed. 相似文献
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Zusammenfassung Alle irreduziblen Systeme von n hermitischen Matrizen j, die den zyklischen Vertauschungsrelationen dritten Grades (s. Gl. (14)) genügen, werden explizite aufgefunden. Es zeigt sich insbesondere, dass bei n=3nur zwei solche nichttriviale Lösungen existieren, eine sechsreihige und eine vierreihige. Die erste ist mit dem von Votruba und Lokajíek zwecks Beschreibung des Verhaltens des isotopen Spins des Nukleons eingeführten Matrixsystem äquivalent. Die zweite Lösung erfüllt zugleich auch die Kemmerschen Relationen. Für jedes n>3gibt es nur je eine nichttriviale Lösung, nämlich die Kemmersche von der Ordnung N=n+1. 相似文献
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We report a novel approach for fabrication of cubic ZrWMoO8 applying a melt quenching method. The stoichiometric mixture of ZrO2, WO3 and MoO3 in a 1:1:1 M ratio was melted and quenched at room temperature by pouring the melts between two metal plates. The quenched sample was characterized by X-ray diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscopy (SEM) analysis. As quenched material is polyphase contains above 70% ZrWMoO8. The obtained composite is thermal stable up to 930 °C. The ZrWMoO8 was indexed as cubic with a lattice parameter a = 9.1263 (3) Å calculated by the “PowderCell” program. By SEM observation it was established that the microstructure of bulk composite material is built up of one-direction orientated agglomerates with cuboid crystal morphology. 相似文献
10.
Janko Drnovšek Igor Pušnik Jovan Bojkovski Gaber Begeš 《Accreditation and quality assurance》2010,15(2):125-131
The article describes the project of regional cooperation in proficiency testing within CARDS 2006 (assistance programme to
the Western Balkans), which was coordinated by European Committee for Standardization, European Commission and European Free
Trade Association and conducted by the University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Metrology
and Quality. The later is the holder of the national standard for thermodynamic temperature as well as an accredited proficiency
testing provider and also accredited as a calibration, testing and inspection laboratory. It is also responsible for graduate
study programme Quality Engineering. Proficiency testing was considered as a core activity of the entire project, but additionally
as a very appropriate platform for knowledge transfer of EU technical legislation in selected sectors, metrology, testing
and quality assurance in general. The project had a high added value for participating laboratories in countries of Western
Balkans, because it required an active role of all participating laboratories, assured participation of staff from national
metrology institutions, all national accreditation bodies, and was supported by national quality infrastructures, such as
standardization, governmental institutions etc. in the entire Western Balkans region. The activities stimulated progress in
the area of conformity assessment, added knowledge to the implementation of technical directives and development of the technical
part of national legislation and therefore facilitated the process toward the accession to the European Union. The main objective
was therefore to organize proficiency testing in those sectors (construction, consumer protection and environment) that were
vital in the pre-accession process of countries seeking full implementation of EU technical legislation. 相似文献