排序方式: 共有15条查询结果,搜索用时 31 毫秒
1.
An investigation of finite-size scaling for systems with long-range interaction: The spherical model
A method is suggested for the derivation of finite-size corrections in the thermodynamic functions of systems with pair interaction potential decaying at large distancesr asr
–d –
, whered is the space dimensionality and>0. It allows for a unified treatment of short-range (=2) and long-range (<2) interaction. The asymptotic analysis is illustrated by the mean spherical model of general geometryL
d–d×
d
subject to periodic boundary conditions. The Fisher-Privman equation of state is generalized to arbitrary real values ofd, 0d. It is shown that the-expansion may be used to study the breakdown of standard finite-size scaling at the borderline dimensionalities. 相似文献
2.
B. Matuszczak 《Monatshefte für Chemie / Chemical Monthly》1996,127(12):1291-1303
Summary A series of N-acetyl--arylglycines (IIa,IIb) was prepared by acid-induced electrophilic -amidoalkylation reactions; compounds of typeIIb were transformed into the corresponding 3-acetylaminobenzo[b]furan-2(3H)ones (III) by treatment with acetic anhydride. It was found that most of these new compounds (lactones as well as open chain derivatives) undergo base induced oxidation in the presence of oxygen with the emission of visible light. Preliminary structure-activity relationships for these novel chemiluminescence class are proposed.
Lineare und cyclische N-Acetyl--aryl-glycine: Synthese und Chemilumineszenz-Untersuchungen
Zusammenfassung Eine Reihe von N-Acetyl--arylglycinen (IIa,IIb) konnte durch sauer induzierte elektrophile -Amidoalkylierung hergestellt werden; die Behandlung von Verbindungen des TypsIIb mit Acetanhydrid führte zu den entsprechenden 3-Acetylaminobenzo[b]furan-2(3H)onen (III). Es zeigt sich, daß die Mehrzahl dieser neuen Verbindungen (sowohl Lactone als auch offenkettige Derivate) bei basisch induzierter Oxidation mit (Luft-)Sauerstoff sichtbares Licht emittieren. Erste Struktur-Aktivitäts-Beziehungen für diese neue chemilumineszenzierende Klasse werden vorgeschlagen.相似文献
3.
4.
5.
介绍了采用IXP425作为主控单元和3片DM642作为数据处理单元的会议电视终端的硬件设计原理和实现方法.IXP425和DM642之间采用PCI总线连接,各模块之间数据传输速度快,提高了数据处理效率.本终端成本低、运行稳定、功能全、接口丰富、数据处理速度快,既能在专网运行也能在普通IP网络运行. 相似文献
6.
7.
We explore the OR gate response in a mesoscopic ring threaded by a magnetic flux . The ring is symmetrically attached to two semi-infinite one-dimensional metallic electrodes, and two gate voltages, Va and Vb, are applied in one arm of the ring; these are treated as the two inputs of the OR gate. All the calculations are based on the tight-binding model and the Green’s function method, which numerically compute the conductance–energy and current–voltage characteristics as functions of the gate voltages, ring-to-electrode coupling strengths and magnetic flux. Our theoretical study shows that, for =0/2 (0=ch/e, the elementary flux-quantum), a high output current (1) (in the logical sense) appears if one or both the inputs to the gate are high (1), while if neither input is high (1), a low output current (0) appears. It clearly demonstrates the OR gate behavior, and this aspect may be utilized in designing an electronic logic gate. 相似文献
8.
O. Duman 《Czechoslovak Mathematical Journal》2007,57(1):367-375
Using the concept of
-convergence we provide a Korovkin type approximation theorem by means of positive linear operators defined on an appropriate
weighted space given with any interval of the real line. We also study rates of convergence by means of the modulus of continuity
and the elements of the Lipschitz class. 相似文献
9.
针对中小企业对硬件防火墙的需要,文章设计了一种基于IntelIXP425的防火墙硬件平台,并介绍了IXP425的选取和芯片特性,系统硬件平台结构和电路设计中的难点及解决方法。测试结果表明,该硬件平台性能良好,稳定可靠。 相似文献
10.
G. Lévai 《Czechoslovak Journal of Physics》2006,56(9):953-966
The Scarf I and Scarf II potentials are discussed within a common mathematical framework, which is then specified to handle
the two potentials separately both in the conventional Hermitian and in the
-symmetric setting. The physically admissible solutions are identified in each case together with the corresponding energy
eigenvalues. Several main differences between the
-symmetric Scarf I and II potentials are pointed out. These include the presence and absence of the quasi-parity quantum number,
the sign of the pseudo-norm, the mechanism of the spontaneous breakdown of
symmetry and the non-
orthogonality of otherwise admissible solutions in the Scarf I potential. Similarities and differences with respect to the
corresponding Hermitian systems are also pointed out. 相似文献