Showing papers by "Xiamen University published in 1989"
TL;DR: It is pointed out that the optimum formula may be used to discuss the effect of finite heat source and thermal resistance on the performances of various thermodynamic cycles and can promote the development of finite-time thermodynamics and the establishment of a systematic theory.
Abstract: A more general model of endoreversible cycles is constructed on the basis of the models of endoreversible three-heat-source cycles and generalized Carnot cycles. Its optimal configuration and fundamental optimum formula are studied. It is pointed out that the optimum formula may be used to discuss the effect of finite heat source and thermal resistance on the performances of various thermodynamic cycles. Some more significant results than those of classical thermodynamics can be obtained. They may provide some new theoretical bases for the exploitation and application of the new technology of three-heat-source cycles applying low-level heat sources such as solar energy, geothermal energy, waste heat, and so on. Simultaneously, it is also expounded that many important conclusions in the current literature concerned with endoreversible cycles may all be included in the optimum formula. It is thus clear that the formula can make a unified description of various endoreversible cycles discussed in finite-time thermodynamics. Obviously, the major significance of such a description lies in that it can promote the development of finite-time thermodynamics and the establishment of a systematic theory.
108 citations
TL;DR: In this article, a spin-free symmetry-adapted valence bond (VB) state, named bonded tableau (BT), is deduced from the classical bonded function and labeled by an at most two-column Weyl tableau.
Abstract: A spin-free symmetry-adapted valence bond (VB) state, named bonded tableau (BT), is deduced from the classical bonded function and labeled by an at most two-column Weyl tableau. The complete set, which is composed of the BT basis or canonical bonded tableau (CBT), can be constructed from an overcomplete set of BT states. CI CBT and VB CBT are two kinds of complete sets that are constructed in this paper. They can be used, respectively, in the CI and VB theory. It is shown that there is a one-to-one correspondence between the labeling scheme for CI CBT and the Gelfand–Tsetlin (GT) basis. This relationship enables an efficient generation and compact representation of the BT basis if one desires to use the known global representation scheme for the GT basis. Effective algorithms for the matrix element evaluation of unitary group generators and products of generators between BT states are presented. In the formulation, the action of a generator on a BT state yields another BT state times a coefficient, so that the matrix elements of an arbitrary multiple product of generators are reduced to a calculation of the overlaps between BT states. The evaluation of the overlaps leads to a simple factorization into cycle contributions, whose values are given explicitly and only depend on the length parameters of the cycles. It is hoped that the presented formalism can facilitate the procedures for handling of the many-electron correlation problem.
68 citations
TL;DR: Bonded tableau functions based on the representation theory of symmetrical groups are proposed for treatment of the problems of many-electron systems using the bonded tableau as a basis, the electronic energy matrix elements of a spin-free hamiltonian have been deduced for valence bond and configuration interaction calculations as discussed by the authors.
34 citations
TL;DR: Embryonic and post-embryonic developmental characters were described and induced ovulation and embryonic development and larval rearing of the mudskipper were conducted in 1986–1988.
23 citations
TL;DR: The presence of the redox couples (eg Fe(CN)3−6/Fe(CN 4−6 and I2/I−) in acidic solutions can have a substantial influence on both magnitude and stability of the photocurrent of polyaniline (PANi) as mentioned in this paper.
22 citations
TL;DR: In this article, the effect of chloride complexes has been investigated over Cl-containing and Cl-free Pd-Mg(II)/Silica gel catalysts for CO hydrogenation.
14 citations
TL;DR: In this article, surface enhanced Raman scattering (SERS) of water can be observed using much lower halide concentrations, from solutions having weak hydrogen bonds between water molecules, such as 8 M NaClO 4, and the SERS spectra of water from a solution containing SCN − are presented.
11 citations
TL;DR: The optical implementations of a 2-D neural net with a third-order interconnection for image quadratic associative memory with compact-encoding method, which can greatly reduce the size of the interconnection tensor, are reported.
Abstract: The optical implementations of a 2-D neural net with a third-order interconnection for image quadratic associative memory are reported. Two types of incoherent optical systems, based on multiple imaging and correlation, are used. In particular, a compact-encoding method, which can greatly reduce the size of the interconnection tensor, is also proposed. The experimental results are given.
7 citations
TL;DR: The opto-electronic implementations of a neural network with a third-order interconnection for quadratic associative memory with two types of incoherent optical systems based on multiple-imaging and correlation are reported.
6 citations
TL;DR: In this article, a unified algorithm and program of symmetry adaptation of spin-free space have been developed and a concise formula about projection operators have been proposed to simplify the symmetry adaptation for many-electron systems.
Abstract: A practical method for generating irreducible matrix reps of point groups and a concise formula about projection operators are proposed. By using this formula as well as versatile classification schemes, the symmetry adaptation of a many-electron system is simplified. A unified algorithm and program of symmetry adaptation of spin-free space have been developed.
5 citations
TL;DR: In this paper, the results of the LRS study of N-containing chemisorbed species on the promoted iron catalyst for ammonia synthesis have further substantiated the existence of two species of N2(a) as the dominant N-bearing species under the functioning catalyst conditions.
Abstract: The results of the LRS study of N-containing chemisorbed species on the promoted iron catalyst for ammonia synthesis have further substantiated the existence of two species of N2(a) as the dominant N-containing chemisorbed species under the functioning catalyst conditions. A model of active site, as 3-Fe cluster on (111) or (211) surface of α-Fe, and two modes of multinuclear coordination activation for the observed two species of N2(a) were proposed. It was further illustrated from reaction energetics that the mechanism of the dominant reaction pathway for ammonia synthesis/decomposition may be associative, rather than dissociative.
TL;DR: In this paper, a general method for the evaluation of the matrix elements of spin-dependent operators is proposed to improve the treatment primitively suggesteed by Cooper and Musher, which is largely based on the recent results which the present authors have achieved in the representation theory for the inner- and outer-product reduction of the symmetric group.
Abstract: In this paper a general method for the evaluation of the matrix elements of spin-dependent operators is proposed to improve the treatment primitively suggesteed by Cooper and Musher. This approach is largely based on the recent results which the present authors have achieved in the representation theory for the inner- and outer-product reduction of the symmetric group. It is shown that the so-called outer-product coupling coefficients (OPCC) can be used to generalize the method for constructing the irreducible tensor operators of group Sn. Together with the use of inner-product coupling coefficients (IPCC), an expression for the matrix elements of spin-dependent operators is presented as the product of a Racah coefficient for Sn and a reduced matrix element which can be expressed in terms of IPCC, OPCC, and the related integrals. The treatment for one- and two-electron spin-dependent operators is discussed in detail.
TL;DR: In this article, the authors introduce and study some more general mixed exponential type integral operators, and introduce a class of summation-integral operators for mixed exponential types of integral operators.
Abstract: In 1984, L. C. Hsu, X. J. Yang and the auther[1] defined a class of summation-integral operators. Later, the author[2]–[5], Mazhar-Totik[6] and Sahai-Prased[7] studied some specific exponential type integral operators, separately. The purpose of this paper is to introduce and study some more general mixed exponential type integral operators.
Journal Article•
TL;DR: A new species of Sepia was found in the material collected from the Nansha Islands of China by the research vessel "SHIYAN 3" of the South China Sea Institute of Oceanoloy, Academia Sinica in 1986.
Abstract: In this paper, a new species of Sepia was found in the material collected from the Nansha Islands of China, at 3°-8°,112°-115°, in depth of 50-111m, by the research vessel "SHIYAN 3" of the South China Sea Institute of Oceanoloy, Academia Sinica, in April 28, 1986 and May 9, 1987.
TL;DR: The effects of two intraperitoneal injections of human chorionic gonadotropin (HCG) or [D-ALA6, pro9-N-ethylamide]-luteinizing hormone releasing hormone analogue (LHRH-A), respectively, and the combined effect of LHRh-A with pimozide (PIM), a dopamine antagonist, on ovulation in female mud skipper were investigated.
Abstract: The effects of two intraperitoneal injections of human chorionic gonadotropin (HCG) or [D-ALA6, pro9-N-ethylamide]-luteinizing hormone releasing hormone analogue (LHRH-A), respectively, and the combined effect of LHRH-A with pimozide (PIM), a dopamine antagonist, on ovulation in female mud skipper were investigated. A high rate of ovulation (83.3%) was observed after injection with HCG(30 I. U./g). Injection of LHRH-A at a total dosage of 2 μg/g was 100% effective in inducing ovulation. No ovulations occurred in the group receiving a low dosage of LHRH-A (0.02 μg/g). Injection of LHRH-A (0.2 μg/g) with PIM (10 or 20 μg/g) induced greater ovulatory response than injection with LHRH-A (0.2 μg/g) alone. PIM at total dosages of 0.2 μg/g or 2 μg/g did not enhance the potency of LHRH-A to stimulate ovulation.
Journal Article•
Journal Article•
TL;DR: In this article, the mechanism of the atomization of boron and the enhancement of sensitivity by matrix modifier Sr(NO3)2 in graphite furnace AAS were discussed.
Abstract: The mechanism of the atomization of boron and the enhancement of sensitivity by matrix modifier Sr(NO3)2 in graphite furnace AAS were discussed. X-ray diffraction and thermodynamic calculation were applied to study the mechanism of boron atomization with and without matrix modifier Sr(NO3)2. The formation of boron atom is due to the sublimation of solid boron which derived from the reduction of B2O3 by carbon. The enhancement of boron signal in the presence of Sr(NO3)2 is due to the formation of SrB6 before atomization, which decreased the volatization losses of B2O3 and retarded the formation of B4C.
TL;DR: In this paper, the authors focus their effort on the stability analysis of large scale systems with more than two subsystems through the equilibrium structure method, and an example is discussed to show the results.
TL;DR: In this paper, the complexity of digraphs has been studied and a number of formulas of inand out-complexities of diggraphs have been derived. But the relation between the complexity and the characteristic polynomial of a graph and the relationship between the graph complexity of line graphs and the original graph is not discussed.
Abstract: It is known that the complexity of a graph is the number of its spanning trees. There are many old results on the algebraic representations of the complexity of a graph. Temperley [7] and Moon [ 6 ] reconsidered this topic in the late 1960s. By a new representation of the complexity of a graph, they obtained the relationship between the complexity and the characteristic polynomial of a graph and the relationship between the complexity of a line graph and the original graph, etc. Thus, the complexity of graphs becomes one of the basic contents of Algebraic Graph Theory [2]. This paper is intended to study the complexities of a digraph. We introduce the concepts of inand out-complexities of a digraph and obtain a number of formulas of inand out-complexities of digraphs. In particular, we give a series of results on the inand out-complexities of semiregular digraphs and of the complementary digraphs of the regular digraphs. Moreover, the concept of the 7-function [2] of graphs is generalized to digraphs, and the expressions of coefficients of functions of digraph are obtained. The results of the complexity and T-functions of a graph can be derived from the related results of the digraph in this paper by substituting each of its edges by two arcs with opposite directions. But the relationshp between the complexity of line graphs and the original graph is an exception [S].
TL;DR: In this paper, the disturbance decoupling problem of decentralized control system using matrix terminology is described and two necessary and sufficient conditions for the disturbance separation are given and a matrix equation is constructed.
TL;DR: In this paper, the electronic structure of rare-earth Eu2+- and Ce3+-doped SrS and CaS alkaline-earth sulphides in the local density theory regime was investigated.
Abstract: The cluster method is used to investigate the electronic structure of rare-earth Eu2+- and Ce3+-doped SrS and CaS alkaline-earth sulphides in the local-density theory regime The ground state is obtained self-consistently by the DV-X alpha method, while the transition state theory is used to calculate the excitation energy of the rare-earth luminescent centre The calculated excitation energy corresponding to the 4f-5d transition of SrS:Eu is 319 eV, which is in agreement with the experimental data at 430 nm for the absorption peak in SrS:Eu The compositions of the ground state and excited state are also calculated; this can give information about the electroluminescence excitation mechanism