Showing papers by "Southwest University published in 2002"
TL;DR: In this paper, high pressure was used to increase the crystallization rate and promote the thickening process of polyethylene terephthalate (PET) lamellar crystals.
Abstract: Crystallized polyethylene terephthalate (PET) samples were obtained at high pressures of 200–400 MPa at a temperature of 603 K, and another group of the samples were made at pressures of 250–350 MPa and different temperatures with a fixed supercooling. The samples were investigated by means of differential scanning calorimetry and scanning electron microscopy. Characterization results suggested that high pressure could increase the crystallization rate and promote the thickening process of PET lamellar crystals.
8 citations
29 Jun 2002
TL;DR: This paper investigates and compares three common initializing algorithms (greedy, insertion and randomization) to solve the TSP (traveling salesman problem) and shows that if the authors pursue different solving qualities, and face different problem sizes, they should select differentInitializing algorithms to generate the initial solutions.
Abstract: Many research results show that TS (tabu search or taboo search) is depended on the selection of initial solutions. For good initial solutions, TS can find better results with quicker speed in the solution space, but poor initial solutions may decrease the TS convergence speed. This paper investigates and compares three common initializing algorithms (greedy, insertion and randomization) to solve the TSP (traveling salesman problem). The experiment shows that if we pursue different solving qualities, and face different problem sizes, we should select different initializing algorithms to generate the initial solutions.
4 citations
Journal Article•
TL;DR: In this article, the authors apply the newest material to a pinpoint analysis of World Urbanization's historical proceeding and trend and present a detailed description of urbanization's states and differences among counties and areas in the world.
Abstract: The paper applies the newest material to a pinpoint analysis of World Urbanization's historical proceeding and trend. In addition, there are some detailed descriptions of urbanization's states and differences among counties and areas in the world. At last, it makes an elaborate description and analysis on the new trend during World Urbanization's proceeding.
1 citations
TL;DR: In this article, the intermediate aryl methanesulfonylhydrazines directly eliminate methane sulfinic acid, affording diazenes which extrude nitrogen affording the desired deaminated products.
Abstract: Reductive deamination (hydrodeamination) of aromatic amines can be conveniently carried out by amination of the corresponding arylamine methanesulfonamides using chloroamine under alkaline conditions. The intermediate aryl methanesulfonylhydrazines directly eliminate methanesulfinic acid, affording diazenes which extrude nitrogen affording the desired deaminated products. Both sulfonamide formation and reduction reactions occur in high yield and are compatible with a variety of functional groups.
1 citations
29 Jun 2002
TL;DR: In this paper, a two-neuron system with distributed delays in the frequency domain is studied, and the mean delay is used as a bifurcating parameter and using the Nyquist criterion, it is shown that Hopf bifurbcation occurs for a strong kernel.
Abstract: In this paper, we study a two-neuron system with distributed delays in the frequency domain. Letting the mean delay act as a bifurcating parameter and using the Nyquist criterion, we show that Hopf bifurcation occurs for a strong kernel.
29 Jun 2002
TL;DR: In this paper, a two-neuron system with distributed delays in the frequency domain was studied and the mean delay was used as a-bifurcating parameter and the Nyquist criterion was used to obtain Hopf bifurcation for a weak kernel.
Abstract: In this paper, we study a two-neuron system with distributed delays in the frequency domain Allowing the mean delay as a-bifurcating parameter and using the Nyquist criterion, we obtain that Hopf bifurcation occurs for a weak kernel, and analyze the direction and stability of the bifurcating periodic solutions