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NBII National Biological Information Infrastructure
In the course of a project of general years' duration, the physico-chemical conditions causing scaling were investigated. Three techniques were compared with regard to their efficiency in scales removal, i.e. solvent stimulation, pressure dependent produc...
National Technical Information Service (NTIS)
Research work done by the Technical University Clausthal/FRG as to jigging of superfine grain revealed that superfine materials of varying specific gravity can be selectively separated on the condition that a gravity-sensitive filter layer is used and the...
/ Figure 2 Addition von NO3 � an Propen: Entwicklung der Gesamtspindichte im Verlauf der Reaktion. Addition of NO3 � to propene: Development of the total spin density during the reaction. #12;130 Organic Chemistry
E-print Network
Fundamental studies were carried out in anaerobic conditions on inorganic and organic sulphur compounds, in consideration of reduction processes. Experiments on archaebacteria showed that some specially adopted cultures grow on brown coal, but these cultu...
Together with polycyclic aromatic hydrocarbons, polychlorinated biphenyls and heavy metals other elements and compounds as well as nutrients are present in typical contaminated areas like sewage fields. They are found as mixed undisturbed contamination an...
Growing cultures of cell suspensions of tomato and maize were capable of partly integrating (radioactively labelled) chemicals like 4-nitrophenol or 2-nitroaniline into the cell wall structure. The rates of integration found range from 1.1 per cent (4-NP ...
The environmental behavior of organomercury compounds with special regard to methyl-mercury(II) was investigated. Organomercury species were extraced with a solution of dithizone in chloroform whereas methylmercury(II) is also extractable using HCl/Toluol...
It was assumed in these investigations that these compounds originated in the gas phase by irradiation - induced reactions with radioiodine. Benzene, alcohol (methanol, ethanol) and alkene (ethylene, propylene) vapour/air mixtures were radiolysed with iod...
Needle material from pairs of trees in an old spruce stand near Hamburg was subjected to comparative, electron-microscopic tissue analyses. The aim is to elucidate the part played by organic air pollutants as one of several causes of novel forest decline ...
High-resolution gas chromatography is a common technique for analyzing volatile constituents of complex samples. Preconcentration of the samples is usually necessary as the volumes that may be injected into a capillary gas chromatography system are limite...
The report is the summary of an estimation of mass and composition of non-methane volatile organic compounds (NMVOC) in Austria. For 1987 emissions of 517,000 tons per year (t/yr) were calculated, which compares to an emission density of 6.12 grams per sq...
The report contains an estimation of mass and composition of non-methane volatile organic compounds (NMVOC) in Austria. For 1987 emissions of 517,000 tons per year (t/yr) were calculated, which compares to an emission density of 6.12 grams per square mete...
Measurements were made of air concentration and deposition at one coastal station at the North Sea and the Baltic Sea, respectively as well as during four campaigns by ship on the North Sea to find out atmospheric input of organic trace substances into th...
Injection of EOR chemicals, e.g. tensides and/or polymers, for enhanced recovery may, in the long run, raise problems on the production side such as bacterial activity and H(sub 2)S formation, emulsion stabilisation in the processing system, corrosion in ...
Die Mikroelekronik steuert auf kleinste Nanostrukturen zu, die heutige lithographische Verfahren nicht mehr erzeugen k�nnen. Einen Ausweg bieten Selbstorganisationsprozesse. Mit ihnen sind im Prinzip gro�fl�chige Anordnungen von Nanostrukturen auf Silizium-Wafern erreichbar. Ein Weg ist das heteroepitaktische Aufwachsen von Filmen, deren ...
NASA Astrophysics Data System (ADS)
>The separation of radioisotopes on the basis of their electrochemical potentials in dissolution from a cathode was investigated with the system ThC(Bi/ sup 222/)/ThC''(Tl/sup 2O8/) and Tl/sup 204/. ThC was separated on the basis of the cathode potential in HCl. After renewal of the electrolyte the ThC was dissolved for 30 minutes and determined in the bath. In spite ...
Energy Citations Database
... H. C. and G. C. Berendt. 1845. Der Bernstein und die in ihm befindlichen Pflanzenreste der Vorwelt. In, Berendt, G. C. (ed.). Die im Bernstein befindlichen organischen Reste der Vorwelt gesammelt in Verbin...
