Showing papers by "Hefei University of Technology published in 1996"
TL;DR: In this article, the particle size and the restabilization of the recycled polyvinylchloride (PVC, from bottles and pipes) were compared with those of virgin pipe grade PVC.
Abstract: Mechanical and processing properties of recycled polyvinylchloride (PVC, from bottles and pipes) were compared with those of virgin pipe grade PVC. Blends of recycled and pipe grade PVC were also prepared and characterized. It was found that the particle size and the restabilization of the recycled PVC are the two main points to be considered for obtaining virgin/recycled PVC blends with uniform and good mechanical properties. In general, recycled PVC not only does not significantly reduce the modulus and tensile strength, but also improves the impact strength and processing behavior of pipe grade virgin PVC. Only the thermomechanical resistance is slightly lowered. The latter points hold, of course, only when the recycled PVC contains both reinforcing and modifier agents. © 1996 John Wiley & Sons, Inc.
49 citations
TL;DR: In this paper, a new production-inventory model is developed for an item with increasing time-varying demand during a finite planning period, and the objective is to find the optimal policy of adjusting the production rate in order to minimize the total system cost.
Abstract: A new production-inventory model is developed for an item with increasing time-varying demand during a finite planning period. We assume that shortages are fully backordered, and the cost of adjusting the production rate depends on the magnitude of the change in the production rate. The objective is to find the optimal policy of adjusting the production rate in order to minimize the total system cost. A solution procedure is presented and a numerical example is provided for the special case of linearly increasing demand.
17 citations
TL;DR: In this article, the bending problem of moderately thick symmetrically laminated anisotropic plates is considered, based on the first-order transverse shear deformation plate theory.
Abstract: In the paper the bending problem of moderately thick symmetrically laminated anisotropic plates is considered, based on the first-order transverse shear deformation plate theory. Using the method of plane wave decomposition and Hormander's operator method, the fundamental solution of the plates is presented. The boundary integral equation of the plates is formulated by taking the fundamental solution presented as the weighted function and using the method of weighted residuals. The numerical calculation of the boundary integral equation presented is discussed in detail. Some examples are presented and compared with the exact solutions and the numerical solutions available in the literature. The numerical results show that the present method has a satisfactory rate of convergence and acceptable accuracy with a reasonable boundary mesh.
12 citations
02 Dec 1996
TL;DR: A fuzzy rough-accurate regulating combined control strategy for the high-speed and high-accuracy position servo system is presented and shows that by using the closed-loop fuzzy control the resolution and accuracy achieved were equal to those of the measuring devices, and the system operated stably and no runaway occurred.
Abstract: The paper introduces the structure, features and functions for the CNC system of the YK3480 gear hobbing-machine and YKA7232 worm wheel gear grinding-machine, as well as some of the key techniques. The system can run with 5-coordination controls and 4-coordinated motions. In order to ensure the static accuracy and dynamic performance, a fuzzy rough-accurate regulating combined control strategy for the high-speed and high-accuracy position servo system is presented. A forward control network is also introduced for reducing corner rounding errors. Practical results show that by using the closed-loop fuzzy control the resolution and accuracy achieved by the servo system were equal to those of the measuring devices, and the system operated stably and no runaway occurred.
6 citations
TL;DR: In this article, the non-homogeneity and complexity of micro network distribution of hydrogel polymers were elucidated by the multifractal theory, and the results showed that the multiferractal spectrum, singular index α and Hausdorff dimension D0 can quantitatively characterize the non homogeneity and the width of network distribution for homopolymers and copolymers.
Abstract: Polyacrylamide (PAM) and poly sodium acrylate (PNaA) homopolymer hydrogels and five kinds of P(AM-NaA) copolymer hydrogels with different monomer molar ratios AM/NaA were synthesized by 60Co-γ ray radiation polymerization in aqueous solutions. The micromorphologies of these hydrogel polymer samples were observed by a scanning electron microscope (SEM). From the interaction between the chain segments of polymers, it is qualitatively expounded that the cross-linking network structure of hydrogel polymers displayed successively the thicker framework network→incomplete bubble film network→dense network with the increase of NaA units in the hydrogel polymer chains. The non-homogeneity and complexity of micro network distribution of hydrogel polymers were elucidated by the multifractal theory. The results show that the multifractal spectrum, singular index α and Hausdorff dimension D0 can quantitatively characterize the non-homogeneity and the width of network distribution of hydrogel homopolymers and copolymers.
5 citations
Journal Article•
4 citations
14 Oct 1996
TL;DR: An algorithm for parallel stereo matching based on dynamic programming and a massively parallel implementation of this algorithm that can use many processors per scanline is proposed and a method of handing inter-scanline inconsistencies that is very well suited for parallel implementation is introduced.
Abstract: This paper proposes an algorithm for parallel stereo matching based on dynamic programming and presents a massively parallel implementation of this algorithm. Our implementation can use many processors per scanline, compared to a naive approach of one processor per scanline. This is important because typical images contain 256 to 1024 scanlines, while massively parallel machines can have many more processors. We also introduce a method of handing inter-scanline inconsistencies that is very well suited for parallel implementation. The method only increases the total amount of processing needed to solve the stereo matching problem by a small fraction. A parallel implementation of both the dynamic programming algorithm and the inter-scanline inconsistency correction algorithm are fully discussed.
3 citations
TL;DR: There is a correlation between the cell malignant degree and its auto-fluorescence intensity, which may provide an important basis for early diagnosis of tumor.
Abstract: The auto-fluorescence of breast cancer cells, early malignant cells of cystic mazoplisis and simple mazoplisis cells is researched with a confocal laser scanning microscope. It is found that there is a correlation between the cell malignant degree and its auto-fluorescence intensity: the auto-fluorescence in the plasma of breast cancer cells is most intensive, in the plasma of early malignant cells of cystic mazoplisis is less and there is no auto-fluorescence observed in the plasma of simple mazoplisis cells. This auto-fluorescence characteristic may provide an important basis for early diagnosis of tumor.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
1 citations
TL;DR: A series of arcuate structures along coastlines of the mainland and behind the island arc system on the margin of the Northwest peri-Pacific region is characterized by an arcuate fracture zone and compensated front-sag as mentioned in this paper.
Abstract: Epi-continental arc system is a series of arcuate structures along coastlines of the mainland and behind the island arc system on the margin of the Northwest peri-Pacific region. Epi-continental arc is similar to the island arc in geometery and kinematics, but it was characterised by an arcuate fracture zone and compensated front-sag, basic volcanic activity, shallow earthquake belt and the latest active tectonics. The eastern China continent is dominated by the coastal epi-continental arc of Southeast China. Its front arc is situated along the coastline of Zhejiang, Fujian and eastern Guangdong provinces which is convex to SE. The left NW-trending flank extended along the NW-trending coast line of northern Jiangsu and traversed Shangdong Peninsula to northern Hebei and Shanxi provinces; and the right E-W trending flank along the western Guangdong, southern Guangxi, northern Hainan coastlines extended to northern Hanoi. This arc controlls activities of the most modern intense earthquakes in eastern China continents. The compressing thrust-type earthquakes occurred along the front arc, especially the “collison belt”, and the strike-slip-type earthquakes along the both flanks sinistral and dextral strike-slip faults respectively. Earthquakes of epi-continental arc type is characterised by segmentation in space and periodicity in time.
1 citations
05 Aug 1996
TL;DR: In this paper, a finite automaton and its applications are discussed, and then a fuzzy automaton model is proposed and the definition, theorems, fuzzy mapping ruler, homomorphism, and minimum states for implementation are given.
Abstract: In this paper, a finite automaton and its applications are first discussed, and then a fuzzy automaton model is proposed. In the fuzzy automaton model, the definition, theorems, fuzzy mapping ruler, homomorphism, and minimum states for implementation are given. In the last, some applications of a fuzzy automaton are illustrated with examples.
1 citations
01 Jan 1996
TL;DR: In this article, an optimal order policy is obtained for determining the number of reorders and the time of the reorder points and shortage points in order to minimize the total cost of system.
Abstract: In this paper, we consider the general inventory problem for deteriorating items having time-varying demand and shortages. An optimal order policy is obtained for determining the number of reorders and the time of the reorder points and shortage points in order to minimize the total cost of system. Several fundamental theoretical results are established for this model. The corresponding cases for no-deterioration and no-shortage is also discussed. To illustrate the solution procedure,numerical examples are shown for the special case of linear increasing demand.
TL;DR: In this article, the distributive law of flow rate for highly viscoelastic flow in three-dimensional slit channel with varying thickness by using Finite Block Element Method (FBM) is studied.
Abstract: The distributive law of flow rate is studied for highly viscoelastic flow in three-dimensional slit channel with varying thickness by using Finite Block Element Method (FBM). As an example, the influence of restrictive block on flow rate is obtained in fish channel of the plate extruding die and the results of numerical simulation are in concordance with the approximatical analytical solution. It is proved that FBM can be considered as an important tool for CAD/CAM.
14 Oct 1996
TL;DR: A new self-adaptive pruning and renovation strategy for modeling dynamic world, which is a crucial problem for mobile robots to build and maintain a map of its environment by means of a Bayesian multiple hypothesis approach.
Abstract: This paper presents a new self-adaptive pruning and renovation strategy for modeling dynamic world, which is a crucial problem for mobile robots to build and maintain a map of its environment by means of a Bayesian multiple hypothesis approach. This strategy mainly consists of two parts: pruning and renovation. Pruning eliminates those branches of the hypothesis tree with lower probabilities. Once the hypothesis branch with the greatest probability is not identical with the actual measurements, other hypotheses will be compared with the actual measurements in turn due to their probabilities. If criteria are satisfied, the strategy will retain it and prune all other branches.
05 Aug 1996
TL;DR: The definition of generalized OR-combined operation of multi-valued logic (MVL) and the algorithm is an extension of the two-valued cover-most algorithm proposed by M.C. Waters.
Abstract: On the basis of discussing extended Allen-Givone implementation oriented algebra, this paper selects a suitable data structure, presents the definition of generalized OR-combined operation of multi-valued logic (MVL) and uses it for solving an EPI set rapidly. In order to speed up the process for solving a cover, the grouping subsume simplification of two-valued sharp product is extended onto position cubical arrays of MVL. By the /spl Delta/ operator, the implementation cost is further lowered after forming a cover. The algorithm is an extension of the two-valued cover-most algorithm proposed by M.C. Waters.
14 Oct 1996
TL;DR: An adaptive vector quantization method for image coding based on a neural network is proposed, which first partitions the image into a subimage and transforms them with the DCT, and then encodes them in the transformed domain using frequency sensitive competitive learning (FSCL).
Abstract: Some vector quantization algorithm are first surveyed. Then, an adaptive vector quantization method for image coding based on a neural network is proposed. This method first partitions the image into a subimage and transforms them with the DCT, and then classifies and encodes them in the transformed domain using frequency sensitive competitive learning (FSCL). The experimental results show that this VQ method has no local region distortion and a high compression ratio.
TL;DR: A new algorithm is presented for the generation of k-ary de Bruijn sequences by juxtaposing the periodic reductions of the cycles, which reduces the time of operation, and accelerates the speed of generation.
Abstract: De Bruijn sequences are highly important nonlinear shift register sequences This paper presents a new algorithm for the generation ofk-ary de Bruijn sequences by juxtaposing the periodic reductions of the cycles Its each step produces a string of elements instead of one element Hence the algorithm reduces the time of operation, and accelerates the speed of generation
01 Jan 1996
TL;DR: In this paper, the authors reported the measurements of the TPA-spectrum of poly(p-phenylenevinylene) (PPV) by the picosecond pump-probe technique.
Abstract: Currently there is a strong interest in exploring the third-order nonlinear processes of conjugated polymers since they provide mechanisms for all-optical switching of light. Some groups have investigated two-photon absorption (TPA) of the conjugated polymer1, 2 because TPA is the dominant mechanism for the imaginary part of the third-order non-linearity. But the ultrafast feature of TPA is accompanied by a weaker long lived excited state absorption1, 2, which is not appropriate for ultrafast optical applications. We report the measurements of the TPA-spectrum of poly(p-phenylenevinylene) (PPV) by the picosecond pump-probe technique, our experimental results clearly show an ‘ultrafast window’ (UW) for TPA without slow absorption tail.
05 Aug 1996
TL;DR: In this article, a Taylor expansion of the perspective coordinates is proposed to improve matching between the model and the image using an iterative scheme for reducing these perspective distortions when they are too large to be handled by a weak perspective approximation, analyzes errors resulting from the projection assumption, and imposes contraints on the motion to reduce the computation complexity.
Abstract: The method of localization and positioning using linear combinations of model views can accurately approximate the appearance of scenes and handles changes in viewpoint assuming the images are obtained under weak perspective projection. However, the method is invalid when perspective distortions get very large. This paper proposes an algorithm that can improve matching between the model and the image using an iterative scheme for reducing these perspective distortions when they are too large to be handled by a weak perspective approximation, analyzes errors resulting from the projection assumption, and impose contraints on the motion to reduce the computation complexity of the method presented. The suggested iterative process is based on Taylor expansion of the perspective coordinates. This expansion results in a polynomial consisting of terms each of which can be approximated by linear combinations of views. Error analysis and experimental results demonstrate that in many practical cases the method is valid.