Showing papers by "Tongji University published in 1988"
TL;DR: In this paper, four beam-interior column Units were designed, constructed and tested subjected to simulated earthquake and gravity loading, and the major test variables were the quantity of horizontal and vertical shear reinforcement in the beam interior column joint cores and the diameter of the beam longitudinal reinforcing bars passing through the joint cores.
Abstract: Four beam-interior column Units were designed, constructed and tested subjected to simulated earthquake and gravity loading. One Unit followed the requirements of the New Zealand concrete design code NZS 3101:1982 for structures designed for ductility. The other three Units only partly followed the requirements of NZS 3101, in order to obtain information on the behaviour of beam-column joints of limited ductility. Plastic hinging was designed to occur in the beams. The major test variables were the quantity of horizontal and vertical shear reinforcement in the beam-interior column joint cores and the diameter of the beam longitudinal reinforcing bars passing through the joint cores. The test results indicted that the current NZS 3101 detailing requirements for shear and bond in the beam-interior column joint core regions of ductile reinforced concrete frames could be relaxed.
60 citations
TL;DR: Endemism of the brackish-water coastal fauna and the relationship between the Chinese and Japanese, and Indonesian-Malaysian faunas are discussed.
Abstract: Modern Ostracoda in shelf seas off China were qualitatively and quantitatively analyzed in 688 surface sediment samples. As a result, a brackish-water assemblage, an eurythermal and steno-haline assemblage and three temperature-related assemblages were recognized. Variations in faunal composition and species diversity are related largely to water temperature and salinity. The China Sea can be divided into three zoogeographical regions based on Ostracoda. Endemism of the brackish-water coastal fauna and the relationship between the Chinese and Japanese, and Indonesian-Malaysian faunas are discussed.
52 citations
TL;DR: An incremental attribute evaluation algorithm is proposed that allows multiple subtree replacement and cancels three auxiliary tables required by the previous version.
Abstract: Three improvements are suggested upon an incremental attribute evaluation algorithm proposed by the first author. The resulting algorithm allows multiple subtree replacement and cancels three auxiliary tables required by the previous version.
23 citations
01 Nov 1988
TL;DR: In this article, the dynamische Lichtstreuung in Form der Photonen-Korrelationsspektroskopie wird in einem Entmischungssystem beispielhaft zur Messung des binaren Diffusionskoeffizienten eingesetzt.
Abstract: Die dynamische Lichtstreuung in Form der Photonen-Korrelationsspektroskopie wird in einem Entmischungssystem beispielhaft zur Messung des binaren Diffusionskoeffizienten eingesetzt. Mit einem Versuchsaufbau wird nahe dem kritischen Entmischungspunkt mit der Homodyn-Methode und weit davon entfernt mit der Heterodyn-Methode gearbeitet. Ein Verfahren ermoglicht die Korrektur der Storeinflusse des Heterodyn-Anteils bei der Homodyn-Messung. Furn-Hexan/Nitrobenzol wird der Diffusionskoeffizient fur vier unterschiedliche Konzentrationswerte als Funktion der Temperatur ausgemessen. Bei der kritischen Konzentration zeigt er bei gleicher Temperatur den kleinsten Wert und last sich nahe dem kritischen Entmischungspunkt durch einen einfachen Potenzansatz mit der reduzierten Temperaturdifferenz ɛ =T (− Tc)/Tc ausdrucken. Die statistische Genauigkeit ist besser als 1 %. Die Ubereinstimmung mit Literaturwerten ist gut.
19 citations
TL;DR: In this paper, the Backlund transformation for a fifth order KdV equation is presented in the bilinear form, and a nonlinear superposition formula related to the BT obtained above is proved rigorously.
Abstract: The Backlund transformation (BT) for a fifth order KdV equation is presented in the bilinear form. Furthermore, a nonlinear superposition formula related to the BT obtained above is proved rigorously. By the way, a nonlinear superposition formula of a modified fifth order KdV equation is also given.
16 citations
TL;DR: A new method, which uses the coupled vibration record (CVR) of very simple section model as basic information to identify binary nonsteady aerodynamic model for nonstreamlined bodies, is proposed.
12 citations
TL;DR: An effective method is presented for automatic construction of incremental LR( 1) parsers that allow multiple modifications of the original input as well as epsilon productions in the underlying LR(1) grammar.
Abstract: An effective method is presented for automatic construction of incremental LR(1) parsers. The resulting parsers allow multiple modifications of the original input as well as epsilon productions in the underlying LR(1) grammar. For parsing a modified input, their space require ment depends linear on the length of the input and their runtime is proportional to the total size of the modifications. The method has been implemented for experimental purposes.
11 citations
TL;DR: The formula of along-wind response, which has been adopted in current Chinese Loading Code, has been derived, and the formula of across-windresponse, which will be adopted in Chinese Design Code of Tower Structures has been introduced.
10 citations
TL;DR: In this paper, the authors considered the index set I n,p for the convergence of n×n irreducible boolean matrices with period p, which is a generalization of the exponent set En for the n × n primitive matrices.
Abstract: In this paper we consider the index set I n,p for the "indices of convergence" of n×n irreducible boolean matrices with period p, which is a generalization of the exponent set En for the n×n primitive matrices We exhibit a system of gaps in the index set I n,p and prove that if n=rp+s with 0sp−1, then there are no gaps below for r35
6 citations
TL;DR: In this paper, the authors proposed a method using the rocking curve of the diffraction line for determining the preferred orientation degree of portlandite and obtaining more precise results, which can be used as a quantitative one.
Abstract: It is pointed out by theoretical analyses that calculating the preferred orientation degree of portlandite within the interfacial zone between cement paste and the aggregate, according to the currently accepted formula, can only be used as a qualitative method. The authors propose a method using the rocking curve of the diffraction line for determining the preferred orientation degree of portlandite and obtaining more precise results. This method can be used as a quantitative one.
6 citations
TL;DR: The index of maximum density of a Boolean matrix A is defined as the least positive integer h=h(A) such that the number of ones in Ah is maximized in all powers of A.
TL;DR: In this article, a composite deck cable-stayed bridge alternative over the Huangpu River in Shanghai, China is analyzed by using the state-space method, and the analysis indicates that the alternative proposed has enough wind-resistant aerodynamic stability at completion stage, but it is necessary to add some ties or guys to raise the wind resistant capability at the construction stage.
TL;DR: In this article, the minimum critical load of cantilever rectangular plates under a concentrated force, a uniformly distributed load, a distributed load in triangular form and a concentrated couple, respectively, is discussed.
Abstract: The present article researches several problems about the lateral instability, of cantilever plates by means of the energy method, in which we discuss the minimum critical load of cantilever rectangular plates under a concentrated force, a uniformly distributed load, a distributed load in triangular form and a concentrated couple, respectively, when the lateral buckling takes place.
TL;DR: In particular, massless fermions arise for some non-abelian groups as mentioned in this paper, and the mass spectra of the twisted models are different from those of the corresponding untwisted models.
TL;DR: In this paper, the problem of the bending, stability and vibrations of the rectangular plates with free boundaries on elastic foundations was discussed, and a flexural function was selected which satisfies not only all the boundary conditions of free edges but also the conditions at free corner points, and consequently a better approximate solution was obtained.
Abstract: This paper discusses the problems of the bending, stability and vibrations of the rectangular plates with free boundaries on elastic foundations. In the present paper we select a flexural function, which satisfies not only all the boundary conditions of free edges but also the conditions at free corner points, and consequently we obtain a better approximate solution. The energy method is used in this paper.
TL;DR: In this paper, a general analytical method based on Ref. [1] is presented to study the bending vibration of an elliptical column partially submerged in water, and it is pointed out that there is a limitation to the method mentioned in Ref.
Abstract: In this paper, a general analytical method based on Ref. [1] is presented to study the bending vibration of an elliptical column partially submerged in water. Besides, it is pointed out that there is a limitation to the method mentioned in Ref. [2]. As a special example, the natural frequencies of circular column submerged in water considering compressibility are calculated, and the extent of compressible effect is given.
TL;DR: In this article, a phenomenal model is proposed to describe a non-Markoff relaxation process and the main feature of the model is the fractal time concept introduced to take account of the coupling of a relaxation mode with a heat bath.
Abstract: A phenomenal model is proposed in this paper to describe a non-Markoff relaxation process. The main feature of the model is the fractal time concept introduced to take account of the coupling of a relaxation mode with a heat bath. The theoretical investigation indicates that a weakly non-Markoff relaxation process can be related to a set of hierarchically distributed Markoff relaxation processes and the fractal exponential law exp [−(t/τ)1−σ] is the character of a non-Markoff relaxation process. Calculations about the temperature and time scale dependence of the exponent σ have been made, and comparison with recent experiments is also given.
01 Sep 1988
TL;DR: In this paper, the authors investigated the stability of a negative charge in polypropylene (PP) corona charged at elevated temperatures, and proposed a phenomenological theory to explain the shift of TSC peaks.
Abstract: Stabilization of a negative charge in polypropylene (PP) corona charged at elevated temperatures is investigated. Measurements of corona current and TSC (thermally stimulated current) yield the charging efficiency and the structure of the trapping levels, respectively. With increasing charging temperatures, the TSC peaks shift to higher temperatures, while the charging efficiency drops. This can be made up partially by prolonging the charging time. A continuous distribution of trap levels has to be assumed, and a new phenomenological theory is suggested. To explain the shift of TSC peaks, trapping and detrapping are taken into account. >
TL;DR: In this article, the Cartan invariant C 11 (n) of the group Sp(4,p n ) was computed and the main results were as follows:==================
Abstract: The purpose of this paper is to obtain a formula for computing the first Cartan invariantC 11 (n) of the groupSp(4,p n ). The main results are as follows:
Theorem A.
If p≥7, then
$$\dim R(n,\theta ) = (32^m - r^m - s^m + 1)p^{4m} $$
where r, s are the roots of x 2 −24x+64.
Theorem B.
If p>7, then
$$c_{11}^{(m)} = \left[ {R(n,\theta ):M(n,\theta )} \right]_{k\Gamma _m } = a^m + b^m + c^m + d^m + e^m + f^m + g^m - 2\left( {\alpha ^m + \beta ^m + \gamma ^m } \right)$$
where a, b, c, d are the roots of x 4 −64x 3+804x 2 −2672x+2048; e, f, g. are the roots of x 3 −36x 2 +256x−512; α, β, γ are the roots of x 3 −43x 2 +312x−512.
TL;DR: In this article, a nonlinear equation of motion for spins on a lattice, coupled to a bath and driven by a transverse rotating field, is derived based on projection operator theory.
Abstract: A nonlinear equation of motion for spins on a lattice, coupled to a bath and driven by a transverse rotating field, is microscopically derived based on projection operator theory. A simplification procedure is proposed for the bath correlation functions. Apart from linear damping and linear effective fields, modified Landau-Lifshitz terms and nonlinear effective fields are obtained. The dependence on the strength and frequency of the driving field is discussed for special cases.
15 Jan 1988
TL;DR: In this paper, a method of HFR combined with double exposure holography, sandwich and strobo scope HFR respectively, and its applications of the quantitative analysis of 3D displacement of human skull; of the change of dentomaxilla and vibration of violin are presented.
Abstract: A method of HFR combined with double exposure holography, sandwich holography and strobo scope holography respectively, and its applications of the quantitative analysis of 3-D displacement of human skull; of the change of dentomaxilla and vibration of violin are presented in this paper.
TL;DR: In this article, the state-of-the-art of seismic risk analysis and strong ground motion modeling is briefly reviewed with emphasis on nonstationary process and the modeling with consideration of earthquake source mechanism.
01 Sep 1988
TL;DR: In this article, the authors report experimental results on bacteria filtering through an electret air filter which has a laminated structure made from a number of PP (polypropylene) electret films separated from each other by aluminum foil.
Abstract: The authors report experimental results on bacteria filtering through an electret air filter which has a laminated structure made from a number of PP (polypropylene) electret films separated from each other by aluminum foil. The authors measure the bacteria filtering efficiency of the filter in natural environment. They also explain its mechanism and discuss the possibility of its application in pharmaceutical factories and bacteria-free rooms. >
TL;DR: In this article, a method for constructing the basis of the SU(3) limit of U(15/30) and of calculation of Hamiltonian matrix elements is given. But this method is not suitable for the case of non-convex matrices.
Abstract: In this short note, we have given a method for constructing the basis of the SU(3) limit of U(15/30) and of calculation of Hamiltonian matrix elements.
TL;DR: In this article, the authors use twisted affine algebra to investigate the modular transformation properties of the partition functions of string theories on group manifolds with twisted boundary conditions and contruct the modular invariant twisted string theories.
TL;DR: A quasi-analytic method of sensitivity analysis based on local difference is proposed, the computational efficiency of which is similar to the analytic method and has the advantage of easy programming.
22 Aug 1988
TL;DR: In this article, a general method for calculating the scattering amplitude of multifrequency acousto-optic diffraction is established, which is based on counting allowable Feynman diagrams.
Abstract: A general method for calculating the scattering amplitude of multifrequency acousto-optic diffraction is established. The method is based on counting allowable Feynman diagrams. It is found that the ratio of the number of Feynman diagrams allowable in the Bragg regime (isotropic, birefringent, and degenerate) to that in the Raman-Nath regime is independent of the total number of different acoustic frequencies, being a function only of the order of the Feynman diagram and the diffraction order of the final state. A general expression for this ratio is obtained. With this as a basis, complete perturbation solutions of the scattering amplitude can be obtained for any final state, any number of acoustic frequencies, and any kind of multifrequency acousto-optic diffraction. The theory is verified by comparing with theoretical results obtained previously and with experiment results.
TL;DR: In this article, a strong and hereditary symmetry operator for a multicomponent water wave equation is found, which yields a hierarchy of classical symmetries, and it is shown that Eq. (3.1) possesses new symmets which depend explicitly on the time-variable t and all of the symmets for Eqs. (1.3) form an infinitely dimensional Lie algebra.
Abstract: A strong and hereditary symmetry operator for a multicomponent water wave equation is found which yields a hierarchy of classical symmetries. Furthermore it is shown that Eq. (3.1) possesses new symmetries which depend explicitly on the time-variablet and all of the symmetries for Eq. (3.1) form an infinitely dimensional Lie algebra.
TL;DR: In this article, a general analytical method-space variable transform method is presented for solving free vibration problems of thick cylindrical shells with arbitrary boundary conditions, which can be extended to analyze free vibration of beams and shells.
Abstract: In this paper, a general analytical method-space variable transform method is presented for solving free vibration problems of thick cylindrical shell with arbitrary boundary conditions. Free vibration characteristics of cantilever thick cylindrical shell are evaluated by the presented method, and the numerical results are compared with the corresponding results of thin shell theory and experimental values. Theoretical analysis and calculating results show that the method presented in this paper has good convergence and accuracy and can be extended to analyze free vibration of beams. plates and shells.