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The enhanced volume source boundary point method for the calculation of acoustic radiation problem

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Chinese Journal of Acoustics 2003年第1期22卷 50-58页

作者： WANG Xiufeng CHEN Xinzhao WANG Youcheng (hefei University of Technology hefei 230009) hefei University of Technology hefei 230009

The Volume Source Boundary Point Method (VSBPM) is greatly improved so that it will speed up the VSBPM's solution of the acoustic radiation problem caused by the vibrating body. The fundamental solution provided by Helmholtz equation is enforced in a weighted residual sense over a tetrahedron located on the normal line of the boundary node to replace the coefficient matrices of the system equation. Through the enhanced volume source boundary point analysis of various examples and the sound field of a vibrating rectangular box in a semi-anechoic chamber, it has revealed that the calculating speed of the EVSBPM is more than 10 times faster than that of the VSBPM while it works on the aspects of its calculating precision and stability, adaptation to geometric shape of vibrating body as well as its ability to overcome the non-uniqueness problem.

关键词： of on in for The enhanced volume source boundary point method for the calculation of acoustic radiation problem is that body been than

A FAST ALGORITHM FOR THE GENERATION OF k-ARY DE BRUIJN SEQUENCES

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Journal of Electronics(China) 1996年第2期13卷 153-157页

作者： Zhu Shixin(Department of Applied Mathematics, hefei University of Technology, hefei 230009)

De Bruijn sequences are highly important nonlinear shift register sequences. This paper presents a new algorithm for the generation of fc-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.

关键词： Shift register De Bruijn sequence Cycles(Necklace)

Wear Performance of Laser Surface Hardened GCr15 Steel

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Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 84-88页

作者：雷声 School of Materials Science and Engineering Hefei University of Technology Department of Electromechanical Engineering Anhui Institute of Architecture and Industry

In order to assess the new tribological properties of laser surface hardened GCr15 steel, the wear resistance between specimens treated with laser and those of conventionally hardened under dry sliding conditions was compared. The change of wear mechanisms in laser hardened GCr15 resulted in a distinct difference in wear rates. The results showed that quenched zones not only had sufficient depth of hardening and higher hardness, but had more retained austenite and finer carbides because of a higher degree of carbide dissolution. Laser surface hardened GCr15 steel specimens exhibited superior wear resistance to their conventionally hardened specimens due to the effects of the microstructure hardening, high hardness and toughness. The wear mechanism for both the laser quenched layer and conventionally hardened layer was highly similar, generally involving adhesive, material transfer, wear-induced oxidation and plowing. When conventionally hardened block specimens rubbed against the laser hardened specimens, the surface of conventionally hardened block specimens was polished. The microstructural thermal stability was increased after laser surface treatment.

关键词： laser hardening dry sliding conditions GCr15 steel wear mechanisms

On the Convergence Acceleration of Composite Sequence Transformation

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大学数学 1996年第4期17卷 22-24页

作者： Tang Shuo(Department of Applied Mathematics, hefei University of Technology, hefei 230009)

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关键词： Aitken△￣2-proce Acceleration Composite Sequence transformation.

Piezoresistive Characteristic of Conductive Rubber for Flexible Tactile Sensor

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Journal of Wuhan University of Technology(Materials Science) 2011年第3期26卷 443-448页

作者：黄英 School of Electronic Science & Applied Physics Hefei University of Technology Institute of Intelligence Machines Chinese Academy of Sciences

In the research of 2D flexible tactile sensor matrix,pressure-sensitive conductive rubber was developed and tested in which carbon black was used as its conductive phase and silicon rubber as its matrix *** were undertaken and the resultant data were used for its piezoresistive characteristics investigation for two kinds of electrode connection configurations,the surface directive connection and embedded *** is found that due to the rather strong nonlinearity of the piezoresistive characteristic curves obtained,a higher correlation relationship can be obtained by means of quadratic polynomial *** also showed that the embedded electrode assembling has higher fitting accuracy while the surface directive connection has better mechanical sensitivity.

关键词： conductive rubber piezoresistive effects flexible tactile sensor

Optimal EOQ Model for Deteriorating Items Considering the Incremental Quantity Discounts and Shortages

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Journal of Systems Engineering and Electronics 1998年第1期9卷 16-23页

作者： Zhou Yongwu Dept. of Math., hefei University of Technology, 230009, P. R. China

In this present paper, a deterministic lot size model is developed for deteriorating items with incremental quantity discounts. It is assumed that shortages are permitted to occur and fully backlogged. A simple solution procedure is shown for determining the optimal order lot size and the optimal order cycle. A numerical example is used to illustrate how the solution procedure works.

关键词： Deterioration Incremental quantity discount Shortages.

GEOCHEMICAL CHARACTERISTICS AND METALLOGENY OF THE HUASHUGOU (IRON) COPPER DEPOSIT IN THE NORTH QILIAN MOUNTAINS

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Scientia Geologica Sinica 1999年第3期 301-310页

作者： Zhou Taofa and Yue Shucang(Department of Resources and Environmental Science, hefei University of Technology, hefei 230009,China)

Studies on REE, trace elements, stable isotopes, fluid inclusion and geochronology indicate that theHuashugou (iron) copper deposit was formed in a submarine rift near continental margin. The ore-formingmaterial mainly came from the Proterozoic basic volcanic rocks, sulfur and carbon mainly from theseawater. Following the development of the arc-trough-basin, the Proterozoic volcanic and sedimentarybasement rocks were subjected to the interaction of the deep-circulating hydTothermal system, the oreforming material was leached, transported and finally exhaled into the sea-floor to form the copper-bearingstTata, while the late metamorphism made some of the ore-forming material activated, transpofted andenriched. This deposit is an exhalation-sedimentation and metamorphic (iron) copper deposit.

关键词： ppm GEOCHEMICAL CHARACTERISTICS AND METALLOGENY OF THE HUASHUGOU IRON

SULFUR SOURCES OF THE COPPER-GOLD DEPOSITS IN THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER AVER: AN INVESTIGATION FROM THE YUESHAN OREFIELD

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Scientia Geologica Sinica 1999年第1期 31-40页

作者： Zhou Taofa Yue Shucang( Department of Resources and Environmental Science, hefei University of Technology, hefei 230009)

The sulfur sources of the copper-gold deposits in the middle and lower reaches of the Yangtze River area are controversial among experts for the characteristic sulfur isotope compositions of these deposits. The Yueshan orefield is taken for example in this paper to elucidate this subject. The δ34S values of the sham-type and the vein-type ores in the Yueshan orefield are -11.25-+19.74‰ and +4.2-+8.7‰, respectively. The disequilibria of the sulfur isotope in deposits indicate that the δ34SH2S in the ore-forming fluids were varied, which were caused not by the change of physicochemical conditions but rather by the sulfur isotope compositional variations of the sources and the water-rock interaction. Possible sulfur transformation mechanisms from source into the hydrothermal solutions are discussed, and the results suggest that the sulfur in the sham-type ore deposits was derived from magmas （78%）, pre-Triassic clastic sedimentary rocks, and the Triassic gypsum （salt）-beds hosted in carbonate strata, whereas the sulfur in the vein-type ores came from magmas （79-97%） and gypsum （salt）-beds hosted in carbonate strata. The mixing was caused by water-rock interaction. So the sulfur isotope composition of a copper-gold deposit depended on the evolutional history of the ore-forming hydrothermal fluids, the sulfur may be multi sources, but to most of the copper-gold deposits in the middle and lower reaches of the Yangtze River area, the Triassic gypsum （salt）-beds hosted in carbonate strata may be a more important sulfur source than elastic sedimentary beds in addition to the magmatic （or intrusive） ones, which to some extent is also proved by the close relationships between the marine Triassic evaporate horizon with the deposits in the whole area. The copper-gold deposits are the products of complicated evolution through water-rock interaction between the ore-forming magmatic solution and the sedimentary strata especially the Triassic gypsum（salt）-beds hosted in carbonate st

关键词： SULFUR SOURCES OF THE COPPER-GOLD DEPOSITS IN THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER AVER AN INVESTIGATION FROM THE YUESHAN OREFIELD

Evolution of the Xiaotian-Mozitan fault and its implications for exhumation of Dabie HP-UHP rocks

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Progress in Natural Science:Materials International 2008年第6期18卷 713-722页

作者： Biwei Xianga,Yongsheng Wanga,*,Changcheng Li b,Guang Zhu a,Yonghong Shi a aSchool of Resource and Environmental Engineering,hefei University of Technology,hefei 230009,China bDepartment of Earth Sciences,University of Western Ontario,Ont.,London,Canada N6A5B7 School of Resource and Environmental Engineering Hefei University of Technology Hefei 230009 China Department of Earth Sciences University of Western Ontario Ont. London Canada N6A5B7

The Xiaotian-Mozitan fault(XMF)located north of the Dabie orogenic belt separates the North Dabie complex to the south from the Beihuaiyang low-grade metamorphic rocks to the *** comprises several NW-striking ductile shear zones and brittle *** brit-tle faults obviously overprinted on the ductile shear zones and promoted the development of the volcanic basins in early Cretaceous to the north,which suggests that the brittle faults were normal faults formed in early Cretaceous during doming of the Dabie orogenic *** ductile shear zone superposed on the north Dabie gray gneiss,and it is an important channel where the Dabie HP-UHP rocks *** obtaining new structural constraint on exhumation of the HP-UHP rocks,we present here experimental results on the microstructure,quartz C-axis fabrics and the microprobe analyses of *** ductile shear zone was determined to be formed at a temperature of 600-650°C and pressure of 1.1 GPa by the mineral deformation,microprobe analyses and geobarometry of Si-in-phengite of the mylonite,the results suggest that the mylonite now exposed on the surface experienced an upper amphibolite-facies metamorphism in the lower *** mineral stretching lineation varies from horizontal in the east segment to sub-dip in the *** sense indicators from outcrop and thin sections of orientated specimen and quartz C-axis fabrics suggest that the XMF is a sinis-tral normal *** kinematics analysis of the ductile shear zone indicates that the exhumation of Dabie HP-UHP rocks is the results of a SE-directed extrusion and an anticlockwise rotation around its eastern pivot simultaneously.

关键词： Xiaotian-Mozitan fault zone Exhumation boundary Ductile shear zone Brittle normal fault