Abstract:Based on the result of NiMH battery performance experiments, changing trend of maximal temperature and difference in temperature of HEV NiMH battery in different SOC and different charging current is analyzed. Considering the working situation of HEV NiMH battery and the theory of battery quick charging, a control strategy for NiMH battery quick charging is described which adapts to HEV regenerative braking system based on Mascc law. By Modeling and simulating the process of NiMH battery quick charging with this strategy, constant voltage charge method and constant current charge method, validates this control strategy.

Abstract:The accuracy of modal parameters identification has the influence on the quality of dynamic characteristics analysis of mechanical structure directly. And the precision of the frequency response function estimation has the great influence on the accuracy of modal parameters identification. In the engineering the frequency response function can be estimated by the average power spectrum and cross-power spectrum with the hel Pof FFT. As the result of limited frequency resolution in the course of FFT and the noise, the accuracy of modal parameters identification is influenced by the frequency response function estimation. This paper has put forward a least-square-based optimization of frequency response function estimation in modal parameters identification. According to the optimized frequency response function, the peak value can be searched to identify the damped natural frequencies and damping ratio directly. An experiment has been made to validate the proposed method. The result indicates that the damped natural frequencies and damping ratio identified by the optimized frequency response function are closer to the true results than which without the optimized frequency response function. So the accuracy of modal parameters identification can be improved by adopting the proposed method.

Abstract:An intelligence interface of EPA is investigated in order to realize long-distance monitor and control the plant.The interface is realized by the hardware and software and has been applied successfully in the project of a corporation's innovation fund.It has illustrated that the method is reliability to monitor and control the plant through internet.

Abstract:A kind of impedance measurement is proposed with piezo-electric element which drives the beam and engender dynamic impedance data. The simple impedance measurement system is consisted of piezoelectric element, an impedance analyzer, Al beam and computer. Impedance of aluminium beam is tested with PZT and studied impedance frequency specialty, and the real impedance, the stain mode and position of PZT are analyzed. Experimental results indicate that frequency response specialty and the response analysis are easy to get.

Abstract:By comparison with quenching and tempering steels the non-quenched-tempered steels not only decrease produetion cost but also can avoid deformation of parts by heat treatment. Grinding hardening, the technology of hardening steel piece surface with grinding heat instead of high or medium frequency induction hardening heat, can integrate grinding surface hardening. This paper tries to carry out test study on grinding hardening of non- quenched and tempered steel. Through carrying out the grinding experiments with variable cut depths and feed speeds, the changing law of depth of hardening layer is studied, and the mierostrueture of test-piece is analyzed. Experimental results show the feasibility of grinding hardening of non- quenched and tempered steel, and the conclusion of this paper can lay the foundations of grinding hardening technology of non-quenched and tempered steel piece.

Abstract:Fiber measurement technology has many advantages, such as no electromagnetic interference, good insulation and small volume. A kind of fiber current sensor is giver, which bases material mechanics and electromagnetic induction, and also makes a cantilever beam and F-P together for measurement. Phase demodulation way is adopted in this paper. The sensor principle and measurement principle of F-P are analyzed. This paper builds up the mathematical model of the F-P gap and gave a current measurement equation. At last some experiments are done to validate it. Advantages of this sensor are small volume, high sensitivity and comoact structure.

Abstract:A digital detecting system of the dielectric loss in the capacitive equipment is introduced based on virtual instruments.This system can real-time collect,analyze,process and storage electrical signals with National Instruments' program LabVIEW and ADLINK,s DAQ board.Through the simulation test in lab and the real test in electric substation,it is shown that this system has high accuracy on testing the dielectric loss in the capacitive equipment,the real test data is stable and the relative error of real dielectric loss is less than 5%.It is to say that this system can meet the requirement of the real on-line monitoring.

Abstract:Basing eliminating on the idea that the generator who has the most influence on the power flow of line is mostly in favor of transmission congestion, the model of congestion management with the object of minimizing adjustments of bufions varied with generation outputs is proposed. It can eliminate the congestion effectively by judging the generators who should be adjusted and the amounts of adjustment. The test on IEEE-RTS24 buses system and other practical systems show that the proposed method is effective.

Abstract:The simulink of the power system can help people to analyze the actual power system's various state.As an important instrument,the Matlab software gains the recognition because of its all-sided and professional features.But when it is used in the field of dynamic process of the power system,there exist some disadvantages such as the difficulty of the modeling.The state-space module can be used to set up the three rank compact model of the generator and the electrical machine.It makes the modeling more convenient and more easily jointed to the system's primary parameter such as voltage and frequency.The typical model of the power system is built including the generator,electrical wire,load and SVC by using the function of the Simulink.In order to make the model's physical conception,some necessary predigestion is made to the typical model.At last,some conclusions about the voltage stabilization are gained by using the simulink of the system's malfunction,testifing the correctness and feasibility of this compact modeling.

Abstract:In order to alleviate the congestion economically and effectually under the competitive circumstance of electricity market,an applied method of congestion management,which based on FGR(Flow Gate Rights),has been proposed.The share of line has been used to define the power plant's influence on congestion.The proportional principle has been used to compute local marginal price.Then they are both used to balance the charge of FGR.The ISO(Independent System Operator) will dispatch the system to meet the FGR holders' rights.This method is used to alleviate congestion effectually,activate power plants to take part in scheduling positively,and level off the price.An instance is used to illustrate the feasibility of this method with FGR.

Abstract:Founding the mathematic model of refrigeration system's dynamic process is the basis of realizing the optimal control of refrigeration machines.Refrigeration evaporator is a kind of two-phase flow and heat exchange with complex process.For its obvious nonlinearity and uncertainty,it is difficult to describe by accurate theoretical model.This paper partitions the input data into some clusters by entropy method and competitive learning algorithm,then the on-line fuzzy identification of dynamic process mathematical model of evaporator is achieved by utilizing ultimate parameter which is ascertained by the recursive least-square(RLS).The simulation results show that fuzzy identification method is effective for on-line model process of evaporator in refrigeration system.The model has not only superior identification precise,but also quite perfect generalizable performance and traceable ability.

Abstract:With the development of circulating fluidized bed boiler(CFB),the study field of external heat exchanger(EHE) is greater in extent and degree.In order to research the working process of EHE,the model which deals with flow and heat transfer of EHE for 300MW CFB of Dong Fang Boiler Grou PCo.Ltd.is presented.Based on the cell modeling theory,the EHE is divided into several chamber by heating surfaces.The mass and energy conservation equations of each cell have been developed according to some reasonable assumption.The complete mathematical model has been compiled by Fortran and solved by classical Algorithm of Runge-Kutta.The static test and perturbation experiment of simulating model has been performed.The simulation results show that the model has been reached the steady state rapidly,the dynamic responses are reasonable and the modeling presented in the paper is reliable and appropriate.

Abstract:Cold gas spray is a relatively new coating technique by which coatings can be formed without significant heating of the sprayed powder.In contrast to the conventional thermal spray processes,such as flame,arc,and plasma spraying,in cold spraying there is no melting of particles prior to impact on the substrate.In cold spray,particles are accelerated to a very high velocity by a flowing gas with supersonic speed and the temperature of spray particles is much lower than its melting point.However,being accomplished in so short an interval,the impact and deposition processes are difficult to be observed by experimental ways.Using molecular dynamics simulation,the deposition of nano-scale Ni clusters on Cu(001) surface was studied.The many-body potential is used to simulate the interatomic force between the atoms.By taking "snapshot",the impact,deposition process and the final appearances of the cluster and the substrate were observed directly.It is found that both the substrate and the cluster deform and lose the crystalline structure.But after reconstruction and relaxation,both of them recover the crystalline structure.In addition,the influence factors on deposition,such as incident velocity and the size of the cluster,are discussedr.Simulation results show that the higher incident velocity or the larger size of the cluster could result in stronger interaction between the substrate and the cluster owing to the higher kinetic energy of the cluster.

Abstract:介绍了Ti-2%Al-2.5%Zr钛合金的成分、组织后,首先测定出了该合金在350 ℃下的σb和σ0.2值.根据试验的特点、试材的组织状况及约比温度等因素确定了试验采用的6个应力水平点.按GB6395-86《金属高温拉伸持久试验方法》标准规定对该合金进行了350 ℃下的持久强度试验.对获得的数据用最小二乘法进行回归处理后,得到了适用于工作应力在σ350 ℃0.2＜σ＜σ350 ℃b范围的方程;而适用于工作应力σ＜σ350℃0.2 并可以外推一个数量级的方程最后,观察到试验后该种钛合金的金相组织发生了明显的变化:在集中塑性变形区呈明显的纤维状,而在均匀塑性变形区则由于回复再结晶而变成细小的等轴晶了.

Abstract:研究了重庆钢铁公司铁水脱硫喷枪耐火浇注料的抗热震性能.试验按YB2206-77和铁水脱硫喷枪的使用环境进行,用断裂能理论研究了裂纹产生到扩展的过程,并结合数学模型讨论了热应力与热膨胀系数、弹性模量、热传导率之间的关系.结果表明,当耐火浇注料的热导率在1～2 W·(m·K)-1时, 热导率变化对最大热应力有很大的影响;耐火浇注料的最大热应力在热膨胀系数为1.2×10-5K-1附近有最小值;耐火浇注料的最大热应力与弹性模量呈线性关系.因此,通过调整浇注料的组成,可以改善其抗热震性能.

Abstract:OGSA, as a universal grid computing frame, has resolved a good many problems in the CSCD, and provides a new solution for the network-based collaborative design. This paper studied the main problems in application of the grid technology to network-based collaborative design system by the OGSA based the WSRF, which is used as the basic platform of collaborative design grid. The meaning of the collaborative design grid is explained, and then the opening architecture of collaborative design grid design process on the condition of eoll is presented based on the function analysis in detail. Meanwhile, the collaborative aborative design grid is explained, and the key technologies of the collaborative design grid are analyzed deeply. The results provide a solution and groundwork for the more research on the collaborative design grid and its implementation.

Abstract:The principle and method of the adaptive filter and the filtering with wavelet transform were analyzed, and the model and method of adaptive filtering with wavelet transforms for the transient signal was established. The separated noise of signal by the multi-scale decomposition of wavelet transforms, was the input signal of adaptive filter, and accordingly the optimal filtering method of signal-noise decomposition was realized. By the adaptive filter grou Pbased on the wavelet transform, the optimal filtering to the multi-noise of signal is achieved at the same time, and the method presented in this paper has the excellent filtering capability. Examples of application demonstrate that this method presented is excellent to realize the optimal estimate to the valuable signal and noise of the transient signal in the same frequency segment.

Abstract:The design of multi-controller and multi-mode control law is presented for the three-link Acrobot on horizontal bar by employing Human simulated intelligent control method based on sensory-motor Schema.Imitated the characteristics of gymnast's swing-up and handstand movement,the control process of robot is divided by six sequence phase.Then the sensory cell and motor cell and the group of sensory-motor schema is designed based on the analysis of quality-quantity combination.The simulation results show that the controller ensures the gesture and the energy to the desired goal,farther more the motion control of giant swing backword is realized in the simulation.

Abstract:A class of pattern formation equations is treated, the existence of its global attractor is considered and some estirnates of its dimension are given. This sort of pattern formation equations relate to turbulence phenomenon in chemistry and combustion, so it is of great physical importance. Besides, its important theoretical value lies in that the equation contains differential operator of the fourth order in space. The global attractor exists after a series sophisticated estimates by the means of interpolation inequity and embedding theorems in sobolev spaces. Furthermore, some estimates on its fractal dimension are given.

Abstract:探讨了涉及fn(f-1)f′与gn(g-1)g′一类微分多项式IM分担1的亚纯函数的惟一性问题,得到了一个新的惟一性定理,推广并发展了方明亮等人的结果.

Abstract:考察了非经典扩散方程ut-Δut-Δu=f(u) g(x)的渐近行为,结合Ma Q、Wang S、Zhong C.提出的关于吸引子存在的一个充要条件、解的先验估计以及解的分解等方法,通过证明半群在吸收集上Lipschitz连续性以及挤压性成立,得出了该方程指数吸引子的存在性.

Abstract:Balanced multiwavelets can avoid prefihering. Cardinal multiwavelet is an active field in wavelet research, By relationshi Pbetween balanced order and approximation order in time domain the author investigate interpolatory multiwavelet and show its balanced order is equal to its approximation order. As for general cardinal orthogonal multiwavelet, sampling property and existent condition of its cardinal parameters are studied. Its balanced order is not equal its approximation order in a general way.

Abstract:对N-圈传播子重整化有限量函数∑c(p)或∏c(p)=G2∑c(p)的"精确计算"问题,作了深入探讨与研究,并在原有研究基础上,对∑c(p)有效计算式的计算问题与计算途径作了全面分析与考察,寻求出简捷与可行的理论计算方案,并对此完成严格解析计算及极限ε→0处理,获得了∑c(p)精确计算结果.同时,还对N-(-N)圈重整化传播子的辐射修正问题作了物理分析与讨论.

Abstract:The static absolute position principle of Global Position System(GPS) is analyzed.The more strict equations of the GPS static absolute position are obtained,by considering the effect of the transmission of signal in earth's gravitation,on the condition that the earth's gravitation is static and spherically symmetric.The satellites' mass can be ignored and the satellites move in circular orbits.The effects of the other celestial bodies on the space-time can be neglected.And then the values of the correction quantities is estimated.The correction quantities are very small,about at the orders of magnitude from mm to cm.Moreover,the current GPS's corrections to the satellite clocks are not correspondent theoretically with the theory of measurement of general relativity.

Abstract:Using density-functional theory, the Schroedinger equation of a 3D box quantum dot in an electric field and a magnetic field has been solved self-consistently and variationally. The ground energy and the chemical potential have been computed in the limit of zero temperature. The author the influence of an electric field and a magnetic field on the ground energy of the box quantum dot.

Abstract:研究温度、pH值和盐浓度对CTAB(十六烷基三甲基溴化铵)/正丁醇/正辛烷/水(或钨酸钠溶液)反相微乳液体系稳定性的影响,并绘制了该反相微乳体系的拟三元相图.实验结果表明:表面活性剂与助表面活性剂的配比对该微乳液的稳定性有显著影响,当CTAB与正丁醇质量比为2: 3时,体系有较大的反相微乳液稳定区;该微乳液体系对温度变化不敏感;pH值为1～7范围内时,该体系具有较好的pH值稳定性;钨酸钠溶液浓度在0.05～0.08 g/mL时,盐浓度对整个微乳区影响不大.结果表明:该反相微乳液体系可作为微型反应器用于纳米粒子的制备.

Abstract:采用喷雾干燥热解二步法制备Y3Al5O12: Ce荧光粉.利用X射线衍射、分子荧光光度法等研究柠檬酸和NaF等助剂添加对荧光粉结构与发光性能影响规律.结果表明,热解温度为1 100 ℃时,荧光粉中已不含YAP等过渡相;NaF能够增加荧光粉的光致发光强度,浓度为0.30 g·L-1时其发光强度最大;加入柠檬酸能够改善荧光粉成型性能,且以与金属离子等摩尔加入时最佳;制备的荧光粉在467 nm处获得最大激发,相应的发射光谱为峰值波长530 nm处的宽带发射.

Abstract:The treatment of eutrophication for lake water body by electro-hyraulic power pulsed technology is presented. The operating principle of electro-hyraulic power pulsed technology, mechanism of purifying eutrophication for lake water body and some experimental results are briefly introduced. A lot of experimental data obtained from experimental study show that electro-hyraulic power pulsed technology is feasible for the treatment of eutrophication for lake water body, and is a very effective method.

Abstract:To realize the transforms of stress and strain and obtain the multi-scale constitutive equation across micro/meso/macro scales.strain-stress curves for magnesium alloy(AM60) and magnesium matrix are carried out with the machine MTS.By means of mixture law,mechanical property of particle is obtained.Based on the character of magnesium alloy structure,the finite element model of unit-cell included complex micro-structures is carried out.Via finite element numerical simulation of magnesium alloy unit-cell,the methodology overcome the limitation of present analytical method.Finally the multi-scale constitutive equation has been used for the analysis of the tensile stress vs. strain curve for magnesium alloy.Results show satisfactory agreement between the stress vs strain curve by the present methodology and the experimental data for AM60.

Abstract:Based on the mechanism of biological phosphorus and nitrogen removal, the collision between on nutrient and resident time is given. In order to solve this problem, a new process for wastewater biological treatment- three-stage SBR process has been developed. Three- stage SBR process treat domestic sewage is applied, which controls various kinds of bacteria optimum growth with the different function that responsibility for removal organics, nitrogen and phosphorus existed in the different reactors and combine with the denitr/fying phosphorus removing process . The experiment results show that ,the three-stage SBR process not only improved the treatment efficiency that COD ,TN,and TPaverage removal efficiency is 87% ,80% and 86% , but also saved the energy cost. removal. The process can make better effect on simultaneous nutrients removal, simple operation and low cost will make a good application prospect for it.

Abstract:Solid waste is one of the major pollution sources of environment.Currently,countries all over the world widely make use of market and public administration to solve the problem.Theories of environmental economics and legal science are fully applied to analyze the effects of these two measures,and conclusions can be made according to their respective traits: market has particular effect and function when dealing with problem of solid waste,but its imperfectness makes it necessary to introduce public administration.However, although it plays an important role in making up imperfectness of market,public administration still has inherent shortcomings and must be limited properly.

Abstract:Analysis and control on roof stability of rock-salt cavity are very important to ensure safety and benefit in production, build and use of repertorv of rock salt cavity. Dynamic balance process and instability process of rock-salt carity roof are studied, and instability mechanism of rock-salt cavity roof is studied with catastrophe theory, and the influencing factor are analyzed, which will be theoretical basis of rock-salt cavity stability control.

Abstract:In order to know the behavior of local nonuniform compression of fired shale perforated brick masonry with rectangular holes,the experimental study of 18 specimens with and without restriction at the end of beam under local compression was carried out.The failure modes and bearing mechanisms of specimens were researched and analyzed,the integrity coefficient of local compression stress figure was deduced,at last,the theoretical and testing values of local compression bearing capacity were compared and analyzed.The results indicate that the bearing performance at the end of wall section under local compression behaves better than that on the fringe,the vertical cracks throughout the specimen on the fringe caused by local nonuniform pressure weaken the advantageous function of 'unloading by the interior arch',the effective supporting length calculated according to code for design masonry structure is partial to safety.These results and suggestions can be used in the design of bearing perforated brick masonry for reference.

Abstract:Earned Value Method only consider cost and schedules, but dose not consider the effects that project quality causes to cost and schedule, thus there is fault while using the method to analyze some problems. In order to overcome the fault, Quality Earned Value Method based on Quality Evaluation is brought forward by building a fuzzy and AH Pmodel to evaluate project quality and by amendingthe Earned Value Method based on the result of evaluating quality. The method is checked with an example. In the example, the Quality Variation is figured out, which shows that Quality Earned Value Method offers a reliance to deal with cost and schedule and quality in earn value management.

Abstract:The near crack line analysis method is used to investigate an eccentric crack loaded by shear forces in a finite plate,and the analytical solution are obtained.The solutions include: the unit normal vector of the elastic-plastic boundary near the crack line,the elastic-plastic stress fields near crack line,law that the length of the plastic zone along the crack line is varied with an external loads,the maximum lengths of the plastic zone,the bearing capacity of a finite plate with an eccentric crack loaded by shear forces.The results are sufficiently precise near the crack line because the assumptions of the small scale yielding theory have not been made and no other assumption have been taken.

Abstract:In the skills-based cooperation,the authors carry on the questionnaire survey about the factors affecting the ability of the enterprise bargaining.The formal questionnaire is established by exploratory factor anlysis with SPSS11.0 software.After processing data,theauthors gain the factors that influence entrprise bargaining power:learning ability,promises,craftsmanship investment,the final cost.The structure equation model between the four factors and the bargaining power is tested with Amous 4.0 software.The learning ability is fonnd,which conduces to improve the enterprise bargaining power.However,the promises have the obstructive effect.

Abstract:In order to better understand the reason why domestic listed companies choose issuing convertible bonds when raising external capital, and what are the differences between the companies which offer convertible bonds and common stock,this paper uses some kinds of statistical analysis methods,mainly descriptive statistics and regressing statistics,and also make use of the financial data from 2000 to 2004 in Chinese security market.It gives an empirical interpretation on domestic listed companies' convertible bonds issuing when an external financing is unavoidable by analyzing the cash flow of the sample companies.The finding is that the listed companies that offering convertible bonds are more financially healthy and having better cash flow.

Abstract:The problem concerning information asymmetry and quality uncertainty in the used automobile market of China has not been settled in a better way for years. Therefore, how to convey the signal of quality to the customers is of great value for used automobile dealers. On the basis of defining the probability of quality evaluation and for the purpose of achieving per expected revenue maximization, this paper builds a model of quality - contingent pricing and thus makes the optimal pricing and discount policy. In addition, this paper displays directly, through data analysis, the impact of the used automobiles pricing policy on the enterprise profits under the context of information asymmetry.