检索结果-南通市图书馆

A Novel Method for Detection and Removal of Line Scratch in High Resolution Digital Film

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2006年第1期11卷 22-26页

作者：周磊倪强周源华 dept.of electronic and electrical eng. Shanghai Jiaotong Univ. Shanghai 200030China

With increasing need of high quality movie, more and more standard resolution films are upconverted to the high-resolution films. After this operation, the defects exist in the old movie are more obvious because they are enlarged in size, therefore, an efficient artifacts detection method with more precise result and lower computational complexity is in need. This paper provided a line scratch mathematical model, which derives from the Kokaram model and Bruni model, and then gave a detection method to meet the requirements of the high-resolution video application.

关键词： digital film restoration line scratch scratch detection scratch removal

Influence of Surface Treatment on the Corrosion Resistance of Stainless Steel in Simulated Human Body Environment

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2009年第5期25卷 611-614页

作者： Esmaeil Jafari Mohammad Jafar Hadianfard dept.of Materials Science and engineering

In the present research, the influence of chromium enrichment by surface treatment on corrosion resistance of type 316L stainless steel in body environment was investigated. For this study, weight loss test during 18 months, cyclic and liner polarization tests before and after surface treatment and metallography by electron and light microscopy were used to evaluate the effectiveness of the proposed method. In addition, X-ray photoelectron spectroscopy （XPS） method was used to determine the chromium concentration in the surface layer after surface treatment. Results show that the surface treatment has improved corrosion resistance of the type 316L stainless steel in body environment.

关键词： Surface treatment Corrosion Passive film Polarization resistance

PRINCIPLE AND METHOD OF CVD MODIFIED TECHNIQUE OF FOAM ASBESTOS

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 1996年第4期11卷 55-61页

作者：荣葵一宋秀敏张仕城 dept.of Resoures and Envor.eng..Wuhan Univ.of Tech.Wuhan 430070 P.R.China

In this paper the method of chemical vapor depostion is used to discuss the principle and method of foam asbestos, a new heat insulation material whose synthetical properties are improved remarkably after modifying. It becomes one of the best heat insulation materials and, a kind of safety, no social effects of pullution material to a great extent.

关键词： heat insulation asbestos chemical vapor deposition silane

Support for Dynamic Service composition with Role-Based Interaction Model

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2006年第1期11卷 56-59页

作者：贺小箭尤晋元唐新怀贾兆庆 dept.of computer Science and eng. Shanghai Jiaotong Univ.Shanghai 200030 China

This paper aims to present a role-based interaction model for dynamic service composition in Grid environments. Assigning roles to a service means to associate with it capabilities that describes all the operations the service intends to perform. When all of the services can be recognized by their roles, the appropriate services can be selected. Based on the interaction policy, a role-based interaction model not only facilitates access control, but also offers flexible interaction mechanism for adapting service-oriented applications. This interaction model adopts programmable reactive tuple space to facilitate context-dependent coordination.

关键词： coordination role service oriented computing software composition

Semi-blind Channel Estimator for OFDM-STC

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2007年第2期12卷 229-233页

作者：吴赟罗汉文宋文涛黄建国 dept.of electronic eng. Shanghai Jiaotong Univ. Col.of Marine eng. Northwestern Polytechnical Univ.

Channel state information of OFDM-STC system is required for maximum likelihood decoding.A subspace-based semi-blind method was proposed for estimating the channels of OFDM-STC *** channels are first estimated blindly up to an ambiguity parameter utilizing the nature structure of STC,irrespective of the underlying signal ***,a method was proposed to resolve the ambiguity by using a few pilot *** simulation results show the proposed semi-blind estimator can achieve higher spectral efficiency and provide improved estimation performance compared to the non-blind estimator.

关键词： channel estimation OFDM-STC semi-blind subspace-based

Overlay Share Mesh for Interactive Group Communication with High Dynamic

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2007年第1期12卷 1-8页

作者：吴言华蔡云泽许晓鸣 dept.of computer Science and eng. Shanghai Jiaotong Univ. dept.of Automatic Shanghai Jiaotong Univ. Univ.of Shanghai for Science and Technology Shanghai Academy of Systems Science

An overlay share mesh infrastructure is presented for high dynamic group communication systems, such as distributed interactive simulation (DIS) and distributed virtual environments (DVE). Overlay share mesh infrastructure can own better adapting ability for high dynamic group than tradition multi-tree multicast infrastructure by sharing links among different groups. The mechanism of overlay share mesh based on area of interest (AOI) was discussed in detail in this paper. A large number of simulation experiments were done and the performance of mesh infrastructure was studied. Experiments results proved that overlay mesh infrastructure owns better adaptability than traditional multi-tree infrastructure for high dynamic group communication systems.

关键词： area of interestc (AOI) overlay architecture group communication share mesh

PIC-MF-based Iterative Receiver for Multiuser Space Frequency Block Coding systems

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2007年第4期12卷 464-470页

作者：林文峰何晨熊勇 dept.of electronic eng. Shanghai Jiaotong Univ. Shanghai Research Center for Wireless Communications

A novel low-complexity iterative receiver for multiuser space frequency block coding (SFBC) system was proposed in this paper. Unlike the conventional linear minimum mean square error (MMSE) detector, which requires matrix inversion at each iteration, the soft-in soft-out (SISO) detector is simply a parallel interference cancellation (PIC)-matched filter (MF) operation. The probability density function (PDF) of PIC-MF detector output is approximated as Gaussian, whose variance is calculated with a priori information fed back from the channel decoder. With this approximation, the log likelihood ratios (LLRs) of transmitted bits are under-estimated. Then the LLRs are multiplied by a constant factor to achieve a performance gain. The constant factor is optimized according to extrinsic information transfer (EXIT) chart of the SISO detector. Simulation results show that the proposed iterative receiver can significantly improve the system performance and converge to the matched filter bound (MFB) with low computational complexity at high signal-to-noise ratios (SNRs).

关键词： iterative multiuser space frequency block coding (SFBC) parallel interference cancellation (PIC) matched filter (MF) extrinsic information transfer (EXIT)

FINITE-ELEMENT MODELLING OF SOIL-GEOGRID INTERACTION DEALING WITH THE PULLOUT BEHAVIOUR OF GEOGRIDS

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 1998年第4期14卷 371-373,375-382页

作者：闰澍旺冯守中 B.Barr dept.of Hydraulic eng. Tianjin UniversityTianjin 300072China Div.of Civil eng. Cardiff School of EngineeringUniv.of WalesCardiffUK

To predict the behavior of geogrids embedded in sand under pullout loading conditions, the two dimensional plane-stress finite element model was presented. The interactions between soil and geogrid were simulated as non-linear springs, and the stiffness of the springs was determined from simple tests in the specially designed pullout box. The predicted behavior of the geogrid under pullout load agrees well with the observed data including the load-displacement properties, the displacement distribution along the longitudinal direction and the mobilization of the frictional and bearing resistance. (Edited author abstract) 8 Refs.

关键词： sand geogrid interaction two dimensional finite-element modelling plane-stress small pullout box pullout rig friction bearing resistance

KINETIC STUDY OF THE CATALYTIC STEAM REFORMING OF PARAFFINS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical engineering 1991年第1期 50-61页

作者：李绍芬李琳廖晖 dept.of Chem.eng. Tianjin UniversityTianjin

Kinetics of the steam reformig of n-butane,n-hexane,n-heptane,n-nonane and i-octane on Z409 catalystwere studied at atmospheric pressure by using an internal recycle gradientless *** reaction temperaturewas varied in the range of 743-853K,the steam carbon molar ratio *** experimental results showed thatthe reforming products contained no hydrocarbon other than *** addition,the product distributionof different n-paraffins were similar,but the product distribution of i-octane was different from that of n-paraffins.A reaction scheme for the steam reforming of paraffin has been proposed and the hyperbolic type rateequations were *** is clear that the obtained kinetic model could simulate the experimental results ofi-octane as well as different n-paraffins satisfactorily.

关键词： reforming octane hexane steam butane molar contained recycle hyperbolic methane