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41.
Otto Biermann 《Monatshefte für Mathematik》1897,8(1):87-94
Ohne Zusammenfassung 相似文献
42.
43.
Wen Li;Yaara Aviad;Igor Reidler;Helun Song;Yuyang Huang;Klaus Biermann;Michael Rosenbluh;Yaohui Zhang;Holger T. Grahn;Ido Kanter 《Europhysics letters》2015,112(3)
Chaos synchronization has been demonstrated as a useful building block for various tasks in secure communications, including a source of all-electronic ultrafast physical random number generators based on room temperature spontaneous chaotic oscillations in a DC-biased weakly coupled GaAs/Al0.45Ga0.55As semiconductor superlattice (SSL). Here, we experimentally demonstrate the emergence of several types of chaos synchronization, e.g. leader-laggard, face-to-face and zero-lag synchronization in network motifs of coupled SSLs consisting of unidirectional and mutual coupling as well as self-feedback coupling. Each type of synchronization clearly reflects the symmetry of the topology of its network motif. The emergence of a chaotic SSL without external feedback and synchronization among different structured SSLs open up the possibility for advanced secure multi-user communication methods based on large networks of coupled SSLs.https://doi.org/10.1209/0295-5075/112/30007 相似文献
44.
Ursula Biermann;Gerd Klaassen;Rainer Koch;Jürgen O. Metzger; 《European journal of organic chemistry》2019,2019(22):3599-3604
Radical hydrosilylation, hydrogermylation and hydrostannylation without any added initiator may be initiated by alkene-assisted homolysis of the respective Si-H, Ge-H and Sn-H bond, three more examples of molecule-assisted homolysis (MAH). We studied the thermally initiated radical addition of tris(trimethylsilyl) silane 1a, tributylgermane 1b, and tributylstannane 1c to methyl 10-undecenoate 2a and of 1a to 1-decene 2b. Computed reaction enthalpies and pathways support the radical formation by MAH. These results give evidence that many respective radical reactions without any added initiator reported in literature may be initiated analogously by MAH. 相似文献
45.
We investigate the Mott transition in weakly coupled one-dimensional (1D) fermionic chains. Using a generalization of dynamical mean field theory, we show that the Mott gap is suppressed at some critical hopping t{ perpendicular}{c2}. The transition from the 1D insulator to a 2D metal proceeds through an intermediate phase where the Fermi surface is broken into electron and hole pockets. The quasiparticle spectral weight is strongly anisotropic along the Fermi surface, both in the intermediate and metallic phases. We argue that such pockets would look like "arcs" in photoemission experiments. 相似文献
46.
Tim Furlan Tountzer Tsagkir Dereli Nils Schmidt Dirk Biermann Andreas Menzel 《PAMM》2023,22(1):e202200123
Continuous technological advancements in the field of grinding technology and improved grinding tools have contributed to the development of high performance grinding processes. One example of such a process is internal traverse grinding (ITG) with electroplated cBN grinding wheels, where the tool consists of a conical roughing zone and a cylindrical finishing zone. Since the tool is fed in axial direction into a revolving workpiece, spindle deflections induced by varying process forces can lead to contour errors along the bore. Numerical simulations are a valuable tool to overcome the challenges associated with such high performance processes. Whenever spindle deflections need to be considered, accurate prediction of the process forces is paramount. Finite Element (FE) simulations have been widely used for the prediction of forces in cutting processes such as turning and milling, where only a small number of active cutting edges is considered, and where the geometry of these cutting edges is clearly defined. Grinding tools, on the other hand, contain a large number of grains with varying geometric characteristics. We recently proposed a multi-scale simulation system for the simulation of ITG processes, where a geometric kinematic grinding simulation, based on a database of digitalised grains of a real grinding wheel, was used to determine the grain engagements [1]. The process forces were obtained from summation of the contributions of all active grains at any given time, based on a force model on the individual grain level. The force model takes the material removal rate and an approximation of the rake angle into account, and was calibrated via finite element simulations. In recent years, the Coupled Eulerian Lagrangian method (CEL), which is part of the commercial finite element software Abaqus, has been applied to simulate various cutting processes. No remeshing is necessary in this framework, and separation of chips from the workpiece can be modelled without element deletion. The application of CEL to the simulation of single grain cutting is therefore a promising approach to further improve the force model included in the process simulation of ITG. In this work, the kinematics of ITG are incorporated into a single grain cutting simulation, and the suitability of the CEL method for the problem is evaluated with a focus on the chip formation, separation and self-contact between the chip and the workpiece. 相似文献
47.
Jennifer Biermann 《Journal of Algebra》2010,323(3):749-756
We study reverse lex ideals in a polynomial ring, and compare their properties to those of lex ideals. In particular we provide an analogue of Green's Theorem for reverse lex ideals. We also compare the Betti numbers of strongly stable and square-free strongly stable monomial ideals to those of reverse lex ideals. 相似文献
48.
Otto Biermann 《Monatshefte für Mathematik》1892,3(1):21-30
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49.
Otto Biermann 《Monatshefte für Mathematik》1890,1(1):49-70
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50.
Otto Biermann 《Monatshefte für Mathematik》1899,10(1):373-375
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