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排序方式: 共有105条查询结果,搜索用时 31 毫秒
1.
Stylianos S. Stamatakis 《Journal of Geometry》1992,44(1-2):177-183
In this paper we study some vectorfields arising in the theory of rectilinear congruences in the real Euclidean space E3. We also derive some integral formulae concerning the vectorfields above. 相似文献
2.
We investigate some relations concerning the first and the second Beltrami operators corresponding to the fundamental forms I, II, III of a surface in the Euclidean space E3 and we study surfaces which are of finite type in the sense of B.-Y. Chen with respect to the fundamental forms II and III. 相似文献
3.
J. A. Poulis C. H. Massen E. Robens G. Reichenauer 《Journal of Thermal Analysis and Calorimetry》2004,76(2):583-592
On the basis of a molecular model for adsorption kinetics Jäntti introduced a method to calculate equilibriums shortly after a change of the pressure of the sorptive gas. In the present paper we show that this method is useful in many more situations than those intended originally. 相似文献
4.
J. A. Poulis E. Robens C. H. Massen G. Reichenauer 《Journal of Thermal Analysis and Calorimetry》2004,76(2):579-582
Jäntti introduced a method to calculate the adsorption equilibrium by measuring the actual adsorbed amount three times after a change to the gas pressure. By this method the experimental time for adsorption measurement can be considerably shortened. The procedure was developed for use in adsorption measurements where the adsorbed masses are directly measured with a balance. In the present paper we will demonstrate that the method is particularly useful in volumetric (manometric) measurements. 相似文献
5.
A new approach
is presented to determine the dimensions of cylindrical nanopores from adsorption
measurements. 相似文献
6.
Stylianos Stamatakis 《manuscripta mathematica》1991,71(1):29-33
Let ℱ: x=x(u1, u2) be a C3-surface in the euclidean space E3, n the unit normal vector of ℱ and let
. We consider the vector
of ℝ6 and we denote with μ the rank of the matrix (a, a1, a2, a1, 1, a1, 2, a2, 2). We then prove the Theorem: ℱ is a W-surface if and only if μ≦5. Further, μ is 4 resp. 3 if and only if the surface ℱ is
part of a cylinder of revolution resp. part of a sphere or a plane.
相似文献
7.
8.
Dr. Peter Thumbs M. Sc. Timm T. Ensfelder M. Sc. Markus Hillmeier Dr. Mirko Wagner M. Sc. Matthias Heiss M. Sc. Constanze Scheel M. Sc. Alexander Schön Dr. Markus Müller Prof. Dr. Stylianos Michalakis Dr. Stefanie Kellner Prof. Dr. Thomas Carell 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(30):12451-12455
9.
H. J. J. Hardy C. H. Massen C. van der Steen J. A. Poulis 《Applied Scientific Research》1973,27(1):129-132
In the preceeding paper on this subject a method was described which enabled the measurement of magnetic susceptibilities in constant magnetic fields. In the present paper it is demonstrated that the application of an alternating magnetic field instead of a constant field is advantageous.Many environmental disturbances are eliminated, the measurement time is highly reduced and the amplitude of the magnetizing field can be brought back to 60 Oersted at which fields the sensitivity is still a few percent for diamagnetic substances. 相似文献
10.
A treatment is presented of the Barkhausen noise in differential transformers in analogy to our noise calculations on fluxgate magnetometers. A numerical estimate is given which for practical situations leads to an accuracy limit of the order of 10?10 m. 相似文献