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15 April 2003, Volume 24 Issue 4 Previous Issue    Next Issue
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Complex temperature field reconstruction algorithm based on combination of regularization method and iterative technology Tian, Feng (1); Shao, Fu-Qun (1); Wang, Fu-Li (1) 2003, 24 (4):  307-310.  DOI: - Abstract ( 214 )   HTML   PDF (256KB) ( 643 )   The Fourier regularizing algorithm in reconstructing complex temperature field was discussed. The stable solution of temperature-field reconstruction problem was obtained by using regularization method, and then the solution was modified by using one-time iterative technology for optimization. Considering the influence of observation matrix on the complex temperature-field reconstruction a new complex temperature field reconstruction algorithm was proposed based on combination of regularization method and one-time iterative technology. The proposed method is fast and more accurate than Fourier regularizing algorithm. References | Related Articles | Metrics

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System structure of alumina production process integrated automation Zheng, Xiu-Ping (1); Wang, Guan (1); Chai, Tian-You (1) 2003, 24 (4):  311-314.  DOI: - Abstract ( 220 )   HTML   PDF (126KB) ( 1238 )   According to the character of alumina production and the difference of energy consumption, production cost and working productivity between the alumina production in our country and in the others, the importance of integrated automation about alumina production process in our country was analysed. Three layers based on BPS/MES/PCS about alumina production process integrated automation were brought forward. The EPS, MES, PCS function was expounded. The matter flow, information flow and fund flow were integrated. The three layers offer the right condition for the realization of flatting management, reduce energy consumption and production cost. References | Related Articles | Metrics

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Speed optimization of block matching motion estimation algorithms Wang, Ze (1); Liang, Chuan (1); Wang, Guang-Xing (1) 2003, 24 (4):  315-318.  DOI: - Abstract ( 207 )   HTML   PDF (193KB) ( 746 )   A center-biased characteristic, most of the matching points are in the center 3X3 scope of searching region, was utilized to optimize fast block matching algorithms. Original searching location prediction was adopted to improve the searching accuracy. The optimized algorithms is faster than original ones while the accuracy doesn't descend. References | Related Articles | Metrics

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Shared path-protection algorithm with traffic grooming capability in WDM mesh networks He, Rong-Xi (1); Wang, Guang-Xing (1) 2003, 24 (4):  319-323.  DOI: - Abstract ( 158 )   HTML   PDF (938KB) ( 514 )   Dynamical establishment of dependable connections in WDM mesh networks with traffic grooming capabilities was addressed. A new routing algorithm for shared path protection was proposed. The algorithm proposed establishes link-disjoint primary and backup traffic stream paths between the source-destination node pair and reduces the spare capacity. It provides the same level of protection against single link failure as dedicated path- protection scheme. Moreover it is better than dedicated path-protection scheme in network utilization. Network performance, based on dynamic traffic with different load, was investigated via simulations. The scheme can improve the performance of the network significantly. References | Related Articles | Metrics

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Application of active database in simulation system of cold Continuous rolling mill Wu, Sheng-Xi (1); Liu, Xing-Gang (1); Yuan, Feng-Hua (1); Xu, Xin-He (1) 2003, 24 (4):  324-326.  DOI: - Abstract ( 220 )   HTML   PDF (135KB) ( 685 )   The importance and the active requirements of simulation system of cold continuous-rolling mill were studied. Active mechanism of active database can provide the corresponding information when events occur and conditions vary in the course of system running. The active function of simulation system was realized by the use of the combination of the simulation and active database and the event-condition-action rules. The active database was designed based on the features of events and actions in simulation system. Finally the technologies and the approaches of active database during realization were discussed. References | Related Articles | Metrics

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Implementation of Chinese WordNet Zhang, Li (1); Li, Jing-Jiao (1); Hu, Ming-Han (1); Yao, Tian-Shun (1) 2003, 24 (4):  327-329.  DOI: - Abstract ( 872 )   HTML   PDF (216KB) ( 3601 )   An approach based on transformation from WordNet to Chinese WordNet is proposed. The system of the Chinese WordNet has been implemented. Some rules for synset's translating arid some methods for reconstituting relation between Chinese word form and word meaning are given. The feasibility and relative problems of the Chinese WordNet are discussed. A self-disambiguation algorithm for the transformation of concept nodes is prescribed. References | Related Articles | Metrics

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- - 2003, 24 (4):  330-333.  DOI: - Abstract ( 218 )   HTML   PDF (252KB) ( 471 )   - References | Related Articles | Metrics

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- - 2003, 24 (4):  334-337.  DOI: - Abstract ( 198 )   HTML   PDF (168KB) ( 427 )   - References | Related Articles | Metrics

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Applying probability learning based evolutionary algorithm to parallel flow lines scheduling problem Pang, Ha-Li (1); Wan, Shan-Shan (1) 2003, 24 (4):  338-341.  DOI: - Abstract ( 183 )   HTML   PDF (184KB) ( 1220 )   Parallel flow-lines scheduling is a new kind of scheduling. The parallel scheduling has the characters of the parallel machines and the flow shop scheduling. A general parallel flow lines problem with the objective of minimizing makespan was considered, and a mixed integer programming model is given. In view of the intractable nature of the problem, a probability learning based evolutionary algorithm was proposed to solve the problem. The algorithm was tested on some randomly generated problems. References | Related Articles | Metrics

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Passive control for discrete-time singular systems Dong, Xin-Zhuang (1); Zhang, Qing-Ling (1); Guo, Kai (2) 2003, 24 (4):  342-344.  DOI: - Abstract ( 324 )   HTML   PDF (124KB) ( 777 )   The definition of strictly passive is proposed for discrete-time singular systems and the passive control problem is discussed under bounded energy exogenous inputs. By means of linear matrix inequalities and generalized algebra Riccati inequalities, a sufficient condition is derived as such that a prescribed discrete-time singular system is admissible and strictly passive. Moreover, a sufficient condition is provided for the existence of a static state feedback controller such that the resulting closed-loop system is both admissible and strictly passive. The design method for such state feedback controller is also given. An example was carried out to prove the sufficient conditions. References | Related Articles | Metrics

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Constructing UML galaxy diagram for OLAP Zhang, Zhe (1); Chang, Gui-Ran (2); Huang, Xiao-Yuan (1) 2003, 24 (4):  345-348.  DOI: - Abstract ( 220 )   HTML   PDF (169KB) ( 770 )   In e-commerce the multidimensional data analysis for OLAP based on web data needs integrating various data sources such as XML data and relational data on the conceptual level. A conceptual data describing method of multidimensional data model for OLAP was presented. Namely based on the algorithm of generating UML diagram from XML data, the UML galaxy diagram was constructed, in order to make multidimensional data analysis of OLAP for multi-subjects. References | Related Articles | Metrics

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Effect of temperature and strain rate upon fracture toughness at high temperature Zhang, Shu-Jia (1); Ren, Zhao-Hui (1); Mei, Guo-Hui (1); Lu, Yan-Lin (2) 2003, 24 (4):  349-351.  DOI: - Abstract ( 297 )   HTML   PDF (159KB) ( 1200 )   The influence of the temperature and strain rate on fracture toughness was studied for pressure vessel steel 20 g. The fracture toughness Ji was measured at 400°C and 500°C under four constant strains rates cases. The fracture toughness Ji decreases greatly as the strain rate increases and the fracture toughness Ji value of the same strain rate at 400°C is less than that at 500°C on loading condition. The appropriate evaluation to the pressure vessel safety at high temperature condition should consider the rule of the fracture toughness varied with temperature and strain rate, and measure the related Ji, value by high temperature fracture toughness experiment. References | Related Articles | Metrics

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Analysis of aluminum electrolyte data and their empirical expressions Qiu, Zhu-Xian (1); Qiu, Tian-Shuang (2); Wang, Zhao-Wen (1); Gao, Bing-Liang (1) 2003, 24 (4):  352-357.  DOI: - Abstract ( 434 )   HTML   PDF (244KB) ( 920 )   From the laboratory data of primary crystallization temperature, electrical conductivity and density of aluminum electrolyte, six empirical expressions were established by regression analysis. The composition of electrolyte consists of Na3AlF6-Al2O3 melts with the additives of AlF3, CaF2 and LiF. These six expressions are comparatively concise and reliable and they are useful for the aluminum metallurgical research work and industrial production. References | Related Articles | Metrics

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Preparation of Al-Sc alloys by molten salt electrolysis Zhang, Ming-Jie (1); Li, Jin-Li (1); Liang, Jia-Xiao (2) 2003, 24 (4):  358-360.  DOI: - Abstract ( 240 )   HTML   PDF (146KB) ( 609 )   On the base of a discussion in all kinds of production methods of Al-Sc alloy, the molten salt electrolysis method was used to produce Al-Sc alloy directively. It is found that as the current density increasing, the concentration of Sc in alloy increases gradually. The maximal concentration of Sc can be 1.5%. But as the MR is increased, the concentration of Sc decreases significantly. When the transited current arrives at a certain extent, cell voltage and back EMF will be increased gradually with increasing eletrolysis process time. References | Related Articles | Metrics

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Cu-Ni-Al superalloy as inert metal anode for aluminum electrolysis Shi, Zhong-Ning (1); Xu, Jun-Li (1); Gao, Bing-Liang (1); Qiu, Zhu-Xian (1) 2003, 24 (4):  361-364.  DOI: - Abstract ( 187 )   HTML   PDF (291KB) ( 936 )   Cu-Ni-Al alloy anode was investigated at 750-850°C in different concentration of A12O3 and cryolite ratio molten salt which consisted of Na3 AlF6-NaCl-CaF2-Al2O3. Anodic current density was set from 0.75 A/cm2 to 1.1 A/cm2. The results indicate that wear rate of the anode is different under various electrolysis operational conditions. The corrosion wear rate is much higher in the molten salt than in air atmosphere. Electrolysis corrosiveness of the anode relies on the concentration of A12O3 in the molten salt. The higher concentration of Al2O3 in electrolyte, the lower wear rate is. Like carbon anode, the Cu-Ni-Al inert metal anode shows very light corrosiveness at high anodic current density. The Cu-Ni-Al alloy shows a good potential as an inert metal anode material. References | Related Articles | Metrics

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Effect of flame heating temperature on properties of welded joint of 6005A aluminium alloy Jiang, Lan (1); Wei, Xu-Jun (1); Yao, Guang-Chun (1); Wang, De-Quan (1) 2003, 24 (4):  365-368.  DOI: - Abstract ( 257 )   HTML   PDF (185KB) ( 942 )   Welding distortion of 6005A aluminium alloy was straightened by flame heating. Effects of temperature on tensile strength, hardness and microstructure of 6005A aluminium alloy welding joint by flame heating were studied. Experimental results showed that tensile strength, hardness and microstructure in soften zone were unchangeable clearly under 200°C , whereas tensile strength and hardness decreased apparently when the heating temperature was above 200°C . The decrease of properties in soften zone is due to the overheat, which leads to crystal coarsening during the influence of the straightening heat. References | Related Articles | Metrics

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Development of new mold powder in continuous casting of ultra-low carbon steel Liu, Cheng-Jun (1); Li, Ying (1); Yu, Jing-Kun (1); Jiang, Mao-Fa (1) 2003, 24 (4):  369-372.  DOI: - Abstract ( 477 )   HTML   PDF (955KB) ( 832 )   A new mold powder was developed in continuous casting production. Being skeleton particles in the mold powder, carbon particles were replaced by B particles. The new mold powder was similar to the conventional mold powder in thermal insulation, melting characteristics, viscous characteristics, inclusion absorption ability and crystallization property. New mold powder can solve the problem of surface carbonization and carbon pick-up of the mold for ULC steel. The new powder has no problems of surface boronization of the mold and boron pick-up for ULC steel. B particles can increase JRBW and A2O3 absorption rate, and can decrease melting rate, viscosity, melting temperature, and solidification temperature, crystallization temperature of the mold powder. References | Related Articles | Metrics

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High resolution auger electron spectroscopy analysis on grain boundaries of high purity Fe-0.2%P-2%Cr-C alloys Bai, Yu-Guang (1); Liu, Chun-Ming (1) 2003, 24 (4):  373-376.  DOI: - Abstract ( 236 )   HTML   PDF (940KB) ( 469 )   The grain boundaries in high purity Fe-0.2%P-2%Cr-C alloys were analyzed by high resolution Auger electron spectroscopy. The results show that a large number of carbides in 0.3 μm average diameter exist at intergranular fracture surface. PHRs (Peak Height Ratio) of carbon at the boundary regions with carbides are 34.9% and 33.3% for two alloys, respectively, and the PHRs of chromium are 14.6% and 7.3%. The carbides are identified as chromium rich carbides. Remarkable segregation of phosphorus and carbon takes place at grain boundary regions without carbides. The segregation levels (PHR) of phosphorus at the boundary regions without carbides are 20.2% and 19.6% for two alloys, respectively, and its enrichment factors are 56 and 54. The PHR values of carbon at the regions are 8.6% and 12.6% for two alloys, respectively, and its enrichment factors are 308 and 450. With increase in carbon content in the alloy, carbon segregation is increased, while phosphorus segregation is slightly decreased. References | Related Articles | Metrics

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In-Situ synthesis of TiC and (TiW)C reinforced iron matrix composites Pan, Wei-Dong (1); Ren, Ying-Lei (2); Qiu, Ke-Qiang (2); Cai, Qing-Kui (1) 2003, 24 (4):  377-381.  DOI: - Abstract ( 214 )   HTML   PDF (274KB) ( 538 )   In-situ synthesis of 10 vol% TiC-Fe and 10 vol% (TiW)C-Fe composites was investigated. The results show that in the TiC-Fe composite, as only second phase, TiC is in two kinds of morphologies, i.e. spherultic and rod-like ones. It is identified that the spherultic TiC is a proeutectic phase and the rod-like one is a eutectic phase. In-situ synthesis of the 10 vol% (TiW)C-Fe composite in liquid iron is feasible. In the composite, the (TiW)C reinforcements are more homogeneously distributed in iron matrix, and most of them are spherultic and the few rod-like. Within the spherultic (TiW)C phase, there is an homogeneous distribution of titanium and tungsten. Its core is rich in titanium, while the periphery rich in tungsten. Such the characteristic microstructure is closely related with its formation during solidification. Comparing with the TiC, the (TiW)C phase has a density matchable for iron melt, which makes it more suitable as in-situ synthesized reinforcements in large size ingots of iron matrix composites. References | Related Articles | Metrics

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Microstructures during deformation-induced phase transformation in low carbon steel Yan, Ying (1); Zhang, Cai-Bei (1); Du, Lin-Xiu (2); Yu, Kun (2) 2003, 24 (4):  382-385.  DOI: - Abstract ( 204 )   HTML   PDF (328KB) ( 790 )   Microstructures deformation induced ferrite under the conditions of various strains at 780°C with 1 s-1 strain rate were investigated by means of optical microscopy and transmission electron microscopy. The influence of strains on the amount and size of deformation induced ferrite was discussed. Results show that morphology of deformation induced ferrite is similar to that of normal annealing ferrite, and the size of deformation induced ferrite is obviously decreased. The increase in amount of the deformation induced ferrite is due to deformation enhancement in phase transformation. The decrease in size of deformation induced ferrite is due to the enhancement of recrystallization. References | Related Articles | Metrics

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Theory analysis of high strength steel-reinforced concrete joint shear capacity Xu, Ya-Feng (1); Wang, Lian-Guang (2); Cao, Yue (3); Liu, Zhi-Yang (1) 2003, 24 (4):  386-388.  DOI: - Abstract ( 221 )   HTML   PDF (124KB) ( 849 )   By experimental test of 5 different samples that high strength reinforced concrete beam and high strength steel-reinforced concrete column, process low cyclic reversed load test. Theory analysis confirm the affecting factors are high strength concrete, axial compression ratio, steel and stripple. Therefore put forward a join!, shear capacity formula for high strength reinforced concrete beam and high strength steel-reinforced concrete column. The theoretical predictions are consistant with experimental so that the formula can be used in engineering applications. References | Related Articles | Metrics

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Deformation of steel and high strength concrete composite beams during loading Xu, Wei (1); Wang, Lian-Guang (2); Zhu, Fu-Sheng (1); Shi, Gang (2) 2003, 24 (4):  389-392.  DOI: - Abstract ( 215 )   HTML   PDF (252KB) ( 566 )   The load-deformation curve was investigated by experimented test on the steel high strength concrete composite beams. There is an interface slip between the steel and concrete beams during loading. The slip affect the limit load, the rigidity and the deformation. Based on the interface slip of the simply supported steel and concrete composite beams, the deformation differential equation of steel and concrete composite beams is established, the calculating formulas of the deformation are proposed for different loading cases by theoretical analysis. A good agreement is obtained between the calculating results and the experimental results. References | Related Articles | Metrics

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- - 2003, 24 (4):  393-396.  DOI: - Abstract ( 195 )   HTML   PDF (269KB) ( 957 )   - References | Related Articles | Metrics

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- - 2003, 24 (4):  397-400.  DOI: - Abstract ( 145 )   HTML   PDF (132KB) ( 697 )   - References | Related Articles | Metrics

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- - 2003, 24 (4):  401-404.  DOI: - Abstract ( 205 )   HTML   PDF (198KB) ( 659 )   - References | Related Articles | Metrics

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- - 2003, 24 (4):  405-408.  DOI: - Abstract ( 137 )   HTML   PDF (168KB) ( 530 )   - References | Related Articles | Metrics