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排序方式: 共有367条查询结果,搜索用时 31 毫秒
1.
Arie Levit 《Geometriae Dedicata》2017,186(1):149-171
The Nevo–Zimmer theorem classifies the possible intermediate G-factors Y in Open image in new window , where G is a higher rank semisimple Lie group, P a minimal parabolic and X an irreducible G-space with an invariant probability measure. An important corollary is the Stuck–Zimmer theorem, which states that a faithful irreducible action of a higher rank Kazhdan semisimple Lie group with an invariant probability measure is either transitive or free, up to a null set. We present a different proof of the first theorem, that allows us to extend these two well-known theorems to linear groups over arbitrary local fields. 相似文献
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Dr. Shao-Ping Zheng Dr. Ji-Jun Jiang Dr. Arie van der Lee Dr. Mihail Barboiu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(43):19082-19088
Transmembrane protein channels are an important inspiration for the design of artificial ion channels. Their dipolar structure helps overcome the high energy barrier to selectively translocate water and ions sharing one pathway, across the cell membrane. Herein, we report that the amino-imidazole (Imu) amphiphiles self-assemble via multiple H-bonding to form stable artificial Cl−-channels within lipid bilayers. The alignment of water/Cl− wires influences the conduction of ions, envisioned to diffuse along the hydrophilic pathways; at acidic pH, Cl−/H+ symport conducts along a partly protonated channel, while at basic pH, higher Cl−/OH− antiport translocate through a neutral channel configuration, which can be greatly activated by applying strong electric field. This voltage/pH regulated channel system represents an unexplored alternative for ion-pumping along artificial ion-channels, parallel to that of biology. 相似文献
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Back Cover: Experimental and Theoretical Study of the Reactivity of Gold Nanoparticles Towards Benzimidazole‐2‐ylidene Ligands (Chem. Eur. J. 30/2016) 下载免费PDF全文
Dr. María Rodríguez‐Castillo Gustavo Lugo‐Preciado Dr. Danielle Laurencin Dr. Frederik Tielens Dr. Arie van der Lee Dr. Sébastien Clément Dr. Yannick Guari Dr. José M. López‐de‐Luzuriaga Dr. Miguel Monge Dr. Françoise Remacle Dr. Sébastien Richeter 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(30):10680-10680
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H. Suchowski B. D. Bruner A. Ganany-Padowicz I. Juwiler A. Arie Y. Silberberg 《Applied physics. B, Lasers and optics》2011,105(4):697-702
A new method for efficient, broadband sum and difference frequency generation of ultrafast pulses is demonstrated. The principles
of the method follow from an analogy between frequency conversion and coherent optical excitation of a two-level system. For
conversion of ultrafast pulses, the concepts of adiabatic conversion are developed further in order to account for dispersion
and group velocity mismatch. The scheme was implemented using aperiodically poled nonlinear crystals and a single step nonlinear
mixing process, leading to conversion of near-IR (∼790 nm) ultrafast pulses into the blue (∼450 nm) and mid-IR (∼3.15 μm)
spectral regions. Conversion bandwidths up to 15 THz FWHM and efficiencies up to 50% are reported. 相似文献
8.
This work reports the modification of thermoplastic polyurethanes (TPUs) in order to enlarge their application range, for example, as biomaterials by increasing its hydrophilicity.A TPU was successfully modified by using three different strategies: ultra-violet irradiation (UV), gamma irradiation (GI) and interfacial modification (IM). The results suggested the possibility of modifying the polyurethane-based surface either with poly(ethylene glycol) (PEG) or hydroxylethyl methacrylate (HEMA) or hexamethylene diamine (HMD) or chitosan (CT) by using any of these methods. The properties of the grafted PU were evaluated by surface, structural and thermal analysis. The results suggest that, among the methods studied in this work, the modification by gamma irradiation (GI) seems to be the most promising, since this method gives high values of grafting yield and has the advantage of providing a clean modification, meaning that no initiator is needed. 相似文献
9.
Optimal location with equitable loads 总被引:1,自引:0,他引:1
Oded Berman Zvi Drezner Arie Tamir George O. Wesolowsky 《Annals of Operations Research》2009,167(1):307-325
The problem considered in this paper is to find p locations for p facilities such that the weights attracted to each facility will be as close as possible to one another. We model this problem
as minimizing the maximum among all the total weights attracted to the various facilities. We propose solution procedures
for the problem on a network, and for the special cases of the problem on a tree or on a path. The complexity of the problem
is analyzed, O(n) algorithms and an O(pn
3) dynamic programming algorithm are proposed for the problem on a path respectively for p=2 and p>2 facilities. Heuristic algorithms (two types of a steepest descent approach and tabu search) are proposed for its solution.
Extensive computational results are presented. 相似文献
10.
Peter Reischig Jorik Blaas Charl Botha Alberto Bravin Liisa Porra Christian Nemoz Arie Wallert Joris Dik 《Journal of synchrotron radiation》2009,16(2):310-313
One of the most fascinating objects in the Rijksmuseum (Amsterdam, The Netherlands) is an early 16th century prayer nut. This spherical wooden object measures 4 cm in diameter and consists of two hemispheres connected with a small hinge so that it can be opened. The interior of the nut holds wood carvings with scenes from the life of Christ. These miniature reliefs show an incredible degree of finish with carving details well beyond the millimetre scale. In the present paper it is shown how synchrotron‐based computer X‐ray tomography revealed the structure and fabrication method of the bead. The central part of the relief was cut from a single piece of wood, rather than assembled from multiple components, underlining the extraordinary manual dexterity of its maker. In addition, a piece of fibrous material contained in the inner structure of the bead is revealed. This may have served as a carrier for an odorous compound, which would be in line with the religious function of the prayer nut. 相似文献