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121.
F. Jancik B. Seifert C. K. Laird W. Czysz J. S. Dunnett W. Schmidt und P. Bachhausen 《Fresenius' Journal of Analytical Chemistry》1987,327(7):747-755
Ohne Zusammenfassung 相似文献
122.
Horst Martini 《Discrete and Computational Geometry》1991,6(1):83-91
In a paper by the author and B. Weissbach it was proved that the projection body and the difference set of ad-simplex (d≥2) are polars. Obviously, ford=2 a convex domain has this property if and only if its difference set is bounded by a so-called Radon curve. A natural question
emerges about further classes of convex bodies inR
d
(d≥3) inducing the mentioned polarity. The aim of this paper is to show that a convexd-polytope (d≥3) is a simplex if and only if its projection body and its difference set are polars. 相似文献
123.
124.
S. Ebel B. Reyer und A. Werner-Busse 《Fresenius' Journal of Analytical Chemistry》1987,327(2):193-197
Summary This paper describes a reliable working station for the in line-process control in chemical plants. Essential parts of the equipment (pump, column) are in duplicates and may be combined by computer control in different lines. One pump and column is in working position, the other is held in ready to work position by conditioning. While one column is in working position, the system is able to calibrate the other column and to switch to this column in the case of breakdown of the other column. By means of chromatographic data (as retention time, peak height of standards, data of separation) the working column is under control and the switching to the other column is down before a real breakdown. The status of the detector is followed by number and distance in time of the necessary auto-zero operations and by the noise of the lamp.
Herrn Prof. Dr. W. Fresenius aus Anlaß des 125jährigen Erscheinens der Fresenius Zeitschrift für Analytische Chemie gewidmet 相似文献
Herrn Prof. Dr. W. Fresenius aus Anlaß des 125jährigen Erscheinens der Fresenius Zeitschrift für Analytische Chemie gewidmet 相似文献
125.
E. Horst 《Communications in Mathematical Physics》1990,126(3):613-633
Spherically symmetric global solutions are shown to exist for the relativistic Vlasov-Maxwell system of plasma physics. In view of a conjectured perturbation result concerning in particular nearly symmetric global solutions, we investigate the asymptotic properties of the symmetric solutions. In the case of only one particle species (say ions but no electrons) we get satisfactory decay estimates; in the general case (ions and electrons) we have preliminary results.Parts of this paper were written during a stay at Indiana University, Bloomington. The author gratefully acknowledges many pleasant conversations with R. Glassey 相似文献
126.
R. Horst 《Journal of Optimization Theory and Applications》1989,61(1):143-146
This technical comment refers to the discussion of strong consistency of several bounding procedures in Lemma 2.1 and Proposition 2.1 of Ref. 1. A necessary clarification is given of the notion of convergence q in Lemma 2.1, and a derivation of Proposition 2.1 is presented that includes a new and simple consistency proof of the classical bounding by convex envelopes used in many branch-and-bound procedures. 相似文献
127.
Horst Wildemann 《Annals of Operations Research》1988,16(1):447-464
Investment decisions for new technologies still contain a comparatively high degree of uncertainty. For reducing this uncertainty, the author proposes a process of strategic-investment-planning that is divided into four steps. First, the technologies under consideration are classified according to their degree of novelty, their position in the life cycle und their technological characteristics. Secondly, the impact of the new technologies on the enterprise's competitive position is determined. From the technology-portfolio, introduction strategies can be derived. Finally, the calendar of technologies demonstrates how to plan for future structural changes in manufacturing technology. The presented instruments are based on empirical research conducted by the author. 相似文献
128.
H. Jork und H. Kurtenacker 《Fresenius' Journal of Analytical Chemistry》1964,204(5):355-356
Ohne Zusammenfassung 相似文献
129.
Dorris Heiligmann und L. Acker 《Fresenius' Journal of Analytical Chemistry》1955,144(4):291-294
Ohne Zusammenfassung 相似文献
130.
Abstract— It was shown that chlorophyll a and its epimer chlorophyll a' are chlorinated and hydroxyl-ated during thin layer chromatography with silica gel plates. Hydroxylated chlorophyll a could not be chlorinated. Chlorinated and non chlorinated chlorophylls could be separated and determined by high performance liquid chromatography, because chlorophylls do not alter during this procedure. These findings support the assumption that Chi RC I is a preparation artifact. The extent of chlorination depends on chloride availability on the thin layer and on time. Chlorination and hydroyxlation do not take place under nitrogen atmosphere. The mechanism of chlorination during the thin layer chromatography procedure is discussed. 相似文献