Showing papers by "Harbin Institute of Technology published in 1987"
TL;DR: The algorithm runs in polynomial time and produces a triangulation within a ratio of O (log n ) to the cost of an optimal triangulations of a set of n points in the Euclidian plane.
77 citations
TL;DR: The phase comparison pulse echo method with two reflectors has been used to determine the velocity of sound in benzene and cyclohexane in the temperature range from 283-323 K and up to the freezing pressures of the liquids, the maximum pressures being 170 and 80 MPa respectively as mentioned in this paper.
Abstract: The phase comparison pulse echo method with two reflectors has been used to determine the velocity of sound in benzene and cyclohexane in the temperature range from 283–323 K and up to the freezing pressures of the liquids, the maximum pressures being 170 and 80 MPa respectively. The density, the isothermal compressibility, the isobaric thermal expansion and the specific heat at constant pressure of both liquids have been evaluated from the measured sound velocity, using a computational method similar to that of Davis and Gordon. The calculated densities for both liquids agree well with those found in the literature.
64 citations
TL;DR: In this article, the authors showed that crosslinking changes the chemical structure of polyvinyl alcohol, involving H 2 SO 4 in the reaction, resulting in thin-film composite membranes with polysulphone as substrate.
49 citations
TL;DR: In this paper, the authors studied the variation in primary and secondary arm spacings with solidification parameters in the Al-Cu system and found that the primary arm spacing Z1 obeys the common correlation Z1 = KG-aV-b in the high velocity regime or low temperature gradient regime, where a and b are constants, the value of K included the composition dependence, G is the temperature gradient in the liquid and V the growth rate.
38 citations
TL;DR: In this article, the temperature characteristics of pH-ISFETs were studied theoretically and experimentally and two simple methods: zero temperature coefficient adjustment and temperature coefficient compensation were described.
38 citations
TL;DR: In this article, the use of bipolar-particles-electrodes in the decolorization of dyeing effluents was studied, which is characterized by its high efficiency, low energy consumption and long performance life.
27 citations
19 citations
TL;DR: In this paper, a failure criterion based on strain energy concepts was proposed for predicting the impact region in an SMC-R50 composite, in conjunction with an experimentally determined contact law.
14 citations
TL;DR: In this article, the three dimensional finite element analysis of eddy current problems using the complex magnetic vector potential is applied to a practical three phase power transformer and the eddy currents in the oil tank and other steel structure parts and the magnetic flux densities in the whole transformer are computed.
Abstract: The three dimensional finite element analysis of eddy current problems using the complex magnetic vector potential is applied to a practical three phase power transformer. The eddy current densities in the oil tank and other steel structure parts and the magnetic flux densities in the whole transformer are computed. Several methods to reduce the amount of computation are presented. The eddy current losses in steel materials are computed by combining numerical method with analytical. The computed results are in substantial agreement with the corresponding experimental values.
11 citations
10 citations
TL;DR: In this article, the authors investigated the variation of interface morphology and dendrite arm spacing with the different additions of Ce in Al-2%Cu and Al-4.5%Cu alloys.
31 May 1987
TL;DR: In this article, three groups of the annular turbine cascades with diameter-blade height ratios d/1 = 1.9, 3, and 5 respectively were tested, each group includes five types of cascades equipped with different kinds of leaned blades.
Abstract: Three groups of the annular turbine cascades with diameter-blade height ratios d/1 = 1.9, 3, and 5 respectively are tested. Each group includes five types of cascades equipped with different kinds of leaned blades. For each type of the cascades, the distributions of total pressure, static pressure and exit flow angle along the pitch and the blade height are surveyed in detail. The experimental results show that the smaller the diameter-blade height ratio of the cascade, the more effective application of positively leaned blade to reduce the secondary flow loss, when the inner and outer walls of the cascade are cylindrical. Under this condition the effect of the blade leaning on the energy loss distribution along the blade height is notable. There is an optimal lean angle corresponding to the minimum of the overall energy loss in each cascade with leaned blades. The function-relation between the optimal lean angle and the diameter-blade height ratio is monotonic.Copyright © 1987 by ASME
TL;DR: In this paper, all the integer solutions of the Diophantine equation Σ j = 1 s ( 1 x j ) + ( 1 (x 1 … x s ) ) = 1 (1 1 s ) when s = 7 (23 solutions in all).
TL;DR: The microstructures and properties of a CTBN rubber toughened tri functional glycidic ester (TGE) epoxy resin dual-phase system were studied in this paper.
06 Apr 1987
TL;DR: In this paper, a new digital image texture analysis method, i.e., gray level and energy co-occurrence image texture analyzer, is presented, which is based on 3 X 3 no-zero-sum mask model and gray level-difference cooccurrence matrix model.
Abstract: In this paper, a new digital image texture analysis method, i.e., gray level and energy cooccurrence image texture analysis method, is presented. According to the method, the two image texture analysis models are designed. They are 3 X 3 no-zero-sum mask model and gray level-difference cooccurrence matrix model. And their texture parameters are calculated by using these models, separately. The satisfactory test results are acquired for classifying the sensing images.
TL;DR: In this paper, the nucleation mechanism of dynamic recrystallization is discussed and the dynamic recovery mechanism is accelerated with the increase of deformation temperature and strain rate of an Al-4.5Cu-1.5Mg alloy.
TL;DR: These features show that the TDM not only improves the system performance, increases the parallelism and the data processing power, but also eliminates the performance bottlenecks in relational database systems.
Abstract: This paper proposes a Tree-structured Database Machine (TDM), which is designed for supporting large relational database systems. The TDM aims at totally improving three level performance bottlenecks in relational database systems, i.e. IO data transfer bottleneck, data processing bottleneck, and multiquery optimization bottleneck. For reducing these bottlenecks, the TDM provides the approaches of data partition and data distribution upon data storages for concurrent data accesses, the tree-structured multiprocessor architecture for parallel data processing, the technique of tightly-coupled-shared-memory for decreasing data movement, the mechanisms of indices and dictionaries for reducing data transfer from the data storages to the memory, and so on. These features show that the TDM not only improves the system performance, increases the parallelism and the data processing power, but also eliminates the performance bottlenecks in relational database systems.
TL;DR: In this paper, an optimum rate program for practical monocrystal production in order to obtain the most economical processing is discussed, where the authors show that increasing the growth rate with time can shorten the initial transient length along a crystal solidified in a Bridgman furnace.
09 Apr 1987
TL;DR: An octant structure for three-dimensional objects is described and a direct proce-dure for encoding larger octant belonging to an object is presented.
Abstract: This paper describes an octant structure for three-dimensional objects. A direct proce-dure for encoding larger octant belonging to an object is presented. Operators associated with octants are provided. Union, intersection, and complement of octants encoded objects are computed. Finally we develop data structures for octant operating.
06 Apr 1987
TL;DR: A smart sensor system for real time remote sensing image processing on-board satellites is described and 3 X 3 mask texture analysis and Hadamard-DPCM data compression suited to the pipeline processing are selected as the system algorithms.
Abstract: A smart sensor system for real time remote sensing image processing on-board satellites is described. In order to implement the optimum system, its hardware and software should be taken an overall consideration. A serial pipeline suited to scanning data processing in real time is adopted as the system architecture. Meanwhile, 3 X 3 mask texture analysis and Hadamard-DPCM data compression suited to the pipeline processing are selected as the system algorithms. Based on the experiment of the model, a practical smart sensor system is presented.
TL;DR: In this paper, the dynamic processes of tensile fracture in unidirectional boron/aluminium composites, with two fibre volume fractions and made by hot-pressing under vacuum, were observed using the in situ technique in a scanning electron microscope on specimens whose surface fibres were exposed.
TL;DR: In this paper, the influence of hot deformation and austenization temperature on the subsequent isothermal transformation to pearlite was studied for steels 40Cr and 50CrV.
Proceedings Article•
26 Apr 1987TL;DR: The first observation of optical bistability and multistability in Canada balsam is reported in this article, where the authors used a novel OBD (Optical Bistability Device) for optical computing systems.
Abstract: Many organic materials exhibit large nonlinearity Bistability in nitrobenzene1 and dye2 has been observed The first observation of optical bistability and multistability in Canada balsam is reported here This kind of optical bistability device (OBD) is economical; solidification makes it convenient in operation It may be useful in optical computing systems
TL;DR: From the view of economy and security of a power system, a synthetic mathematical model is presented for minimizing system losses and improving voltage level and the algorithm available for optimal control of voltage and reactive power of power system is presented.
TL;DR: The first experimental observation of two-photon optical bistability in Raman case (both in ordinary stimulated Raman scattering and Raman laser) is reported in this paper.
Abstract: The first experimental observation of two-photon optical bistability in Raman case (both in ordinary stimulated Raman scattering and Raman laser) is reported. The active control character in two-photon bistability is verified. It is also shown that the bistability plays an important role in efficient stimulated Raman scattering conversion.
TL;DR: In this paper, a finite element analysis was used to predict residual flexural stiffness and strength of SMC-R50 composite panels after impact, and the results were compared with experimental data.
Abstract: Thickness change in SMC-R50 composite panels was used as a parameter to gauge impact-induced damage. Relations between thickness change and reductions in bending rigidity and bending strength were determined experimentally. These relations were then used in a finite element analysis to predict residual flexural stiffness and strength of SMC panels after impact. Analytical predictions were compared with experimental data.
TL;DR: On peut avec cet appareil etalonner de facon precise beaucoup de sortes de thermometres de rayonnement, de detecteurs IR et d'instruments and de systemes IR.
Abstract: On peut avec cet appareil etalonner de facon precise beaucoup de sortes de thermometres de rayonnement, de detecteurs IR et d'instruments et de systemes IR