Showing papers by "Tongji University published in 1986"
23 citations
01 Jan 1986
10 citations
TL;DR: In this paper, a nonsteady-state method for addition polymerization with instantaneous initiation, termination by disproportionation, and combination was proposed. But it is not suited to such types of polymerization as that of vinyl monomers radiated by 60Co under deep-freezing conditions, the resultant not very reactive free radical accumulating, then stopping the radiation and letting the polymerization begin at a higher temperature.
Abstract: Expressions for the molecular size distribution, the average degree of polymerization, etc. are derived by means of the nonsteady-state method for addition polymerization with instantaneous initiation, termination by disproportionation, and combination. Furthermore, a theoretical method is established with which the curves of the differential molecular weight distribution and the values of other molecular parameters can be calculated from the initial conditions of polymerization and the monomer conversion or reaction time. This theory is suited to such types of polymerization as that of vinyl monomers radiated by 60Co under deep-freezing conditions, the resultant not very reactive free radical accumulating, then stopping the radiation, and letting the polymerization begin at a higher temperature.
8 citations
TL;DR: In this paper, a density of states of two-level systems which is non-linearly temperature dependent was introduced to explain the "excess T 3 " anomaly in the specific heat and the "plateau" in the thermal conductivity of glasses.
7 citations
TL;DR: The unidirectional-polycyclic evolution of crustal position and the regimes of tectonic disturbance are the most important factors which determine the structure of Chinese petroliferous basins, and the habitat of oil and gas as discussed by the authors.
Abstract: The unidirectional-polycyclic evolution of crustal position, and the regimes of tectonic disturbance are the most important factors which determine the structure of Chinese petroliferous basins, and the habitat of oil and gas. Chinese basins can be differentiated into various prototypes in terms of historical stages and geodynamic mechanisms. If their complex and superimposed configurations are systematically investigated, an appraisal of the undiscovered oil and gas resources of China may be possible.
7 citations
01 Jan 1986
6 citations
TL;DR: In this paper, a palynological study on the Quaternary sediments of 42 cores in the region of the Yangtze River Delta and the sections of 4 relics had been done since 1960.
Abstract: The palynological study on the Quaternary sediments of 42 cores in the region of the Yangtze River Delta and the sections of 4 relics had been done since 1960. Palynological assemblages from the region of the Yangtze River Delta, showing obviously common characteristics but with slight differences because of the vast areas covered can be divided into five spores and pollen zones and three subzones in ascendant order:
I.
Quercus alienc-Pinus-Cupressaceae—Chenopodiaceae spores and pollen zone reflecting the cool, then cold and dry climate—Preboreal.
II.
Quercus dentata-Quercus acutissima-Pinus-Castanea-Artemisia spores and pollen zone reflecting the temperate and cool, but a little dry climate—Boreal.
III.
Quercus glauca-Castanopsis-Myrica-Castanea spores and pollen zone reflecting the hot and moist climate—Atlantic.
IV.
Quercus acutissima-Pinus-Castanea-Quercus glauca- Chenopodiaceae spores and pollen zone reflecting the warm, and a little dry climate—Subboreal.
V.
Quercus acutissima-Castanea-Quercus glauca-Liquidambar spores and pollen zone, containing more pollen of evergreen broadleaved trees in the south, dominated by pollen of deciduous broadleaved trees in the north, reflecting the climate then (similar to that now), considered as Subatlantic. It can be further divided into three spores and pollen subzones:
a.
Quercus glauca-Quercus acutissima-Castanea-Pinus spores and pollen subzone.
b.
Pinus-Ulmus-Quercus acutissima-Cupressaceae spores and pollen subzone.
c.
Pinus-Quercus glauca-Ulmus-Castanea-Liquidambar spores and pollen subzone.
5 citations
TL;DR: In this paper, the authors solved the dangling-bond and void-like structure model by path integral theory and showed that an atom in a void will meet an effective potential with two phases: the double-well phase and the singlewell phase, depending on the radius of the void.
5 citations
01 Jan 1986
2 citations
TL;DR: In this paper, a method of optimal design of the shallow shell with double curvature on the elastic foundation is discussed, where the authors take the initial flexural function as the control function or design variable which will be found and the potential energy of the external loads as the criterion of quality of the optimal design.
Abstract: The present paper discusses a method of optimal design of the shallow shell with double curvature on the elastic foundation Substantially we take the initial flexural function as the control function or design variable which will be found and the potential energy of the external loads as the criterion of quality of the optimal design of the shallow shell with double curvature, therefore the functional of the potential energy will be aim function. The optimal conditions and the isoperimetric conditions belong to the constrained conditions. thus we obtain the necessary conditions of the optimal design for the given problems, at the same time the conjugate function is introduced, then the problems are reduced to the solutions of two boundary value problems for the differential equation of conjugate function and the initial flexual function.
2 citations
TL;DR: In this article, a quantized Hamiltonian for optical phonons in disordered materials is presented, including both the short and long-range forces, including the competitive effects of the long range correlation and the local structural fluctuation on the optical phonon.
TL;DR: In this article, the authors present an SUSY GUT model, in which the strong CP violation can be eliminated via the invisible axion mechanism, and they show that any b1, 1=0 model cannot use the entropy production mechanism, however, A2, A3, A4, A5, B2, B4, B5 and C2 in b 1 ≥ 1 case can do.
Abstract: We present an SUSY GUT model, in which the strong CP violation can be eliminated via the invisible axion mechanism. We show that any b1, 1=0 model cannot use the entropy production mechanism, however, A2, A3, A4, A5, B2, B4, B5 and C2 in b1, 1 ≥ 1 case can do. As an example, we present an A4 model in which axion are diluted efficiently by the entropy production and the fast proton decay is forbidden without requirement of discrete symmetry.
TL;DR: In this article, the properties of polaritons in a disordered material were studied under the Coherent Potential Approximation (CPA) under the concept of effective wave vector.
Abstract: The properties of polaritons in a disordered material are studied under the Coherent Potential Approximation. The main results are as follows: (i) The concept of effective wave vector can be used to describe the polariton in a disordered material. (ii) The polariton dispersion in a disordered material is similar to that in a crystalline material. (iii) The polariton lifetime due to the disorder increases as its energy departs from the resonant region.
TL;DR: In this paper, a simple method for measurements of dynamic deformation by mismatch white speckle method using dynamic photoelastic device is presented, which is able to measure both large and small deformation, combined with dynamic isochromate pattern, the elastic modulus Poisson's ratio and dynamic material fringe value.
Abstract: This paper presents a simple method for measurements of dynamic deformation by mismatch white speckle method using dynamic photoelastic device. The method is able to measure not only large dynamic deformation[1], but also small dynamic deformation. Combined with dynamic isochromate pattern, the elastic modulus Poisson's ratio and dynamic material fringe value of the material measured can be obtained by the method.
01 Jan 1986
TL;DR: A four-step algorithm of FLE (Feedback Linear Estimation) based on the feedback control principle for ARMA processes is presented in this paper and linear estimations are utilized as a tool throughout the algorithm.
Abstract: A four-step algorithm of FLE (Feedback Linear Estimation) based on the feedback control principle for ARMA processes is presented in this paper. The proposed algorithm uses three linear least square estimators and a linear filter. Linear estimations are utilized as a tool throughout the algorithm. The physical meaning of FLE is discussed and some simulation examples are shown.
TL;DR: In this paper, the classical theory of Lagrange's equations with nonholonomic constraints is put into an invariant and coordinate free form, and the problems of constraint imbedding and conservation laws are discussed within this framwork.
Abstract: This paper deals with the nonholonomic mechanical systems of Chetaev's type by use of modern differential geometric methods. Based on a precise definition of Chetaev-type constraint pfaffian systems, the differential geometric structure is given for the description of nonholonomic mechanical systems. In this framwork, the classical theory of Lagrange's equations with nonholonomic constraints is put into an invariant and coordinate free form. Furthermore, the problems of constraint imbedding and conservation laws are discussed within this framwork, and the Noether-type thereom on constraint-imbedding submanifolds is obtained.
TL;DR: In this paper, the scaling violation of the nucleon structure functions and the EMC effect are explained through the dependence of the effective bag radius R on Q2 and mass number A.