|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Heavy Metal Runoff in Relation to Soil Characteristics显示文摘Cu, Zn, Pb and Hg runoff from yellow limestone soil and purple soils and the relationships between the mobility of the heavy metals and the soil characteristics were studied in laboratory using a rainfall simulator. The results showed that the concentrations of soluble Zn in surface runoff were significantly negatively correlated with the contents of <0.002 mm particles and CEC of the soils, indicating that Zn was mostly adsorbed by clays in the soils. The contents of Cu and Hg in surface runoff were positively related to their contents in the soils. The amounts of Cu, Zn, Pb and Hg removed by surface runoff were influenced by the amounts of soil and water losses and their contents in the soils, and were closely related to the contents of soil particles 1-0.02 mm in size. | ZHAO XIULAN, QING CHANGLE and WEI SHIQIANG College Of Resources and Environmental Science, Southwest Agricultural University, Chongqing 400716 (china) | 2001 | Pedosphere2001，11，2： | 16 |
| 2 | MPC-based energy management with adaptive Markov-chain prediction for a dual-mode hybrid electric vehicle显示文摘The and energy to management strategy battery is state an important part of a hybrid electrical vehicle design.It is used to improve various fuel economy sustain a proper of charge an by controlling control the power components is while satisfying to constraints and driving demands.However,achieving optimal and performance challenging due the nonlinearities of the hybrid powertrain,conflicting vehicle the time varying constraints,the dilemma capable in which controller control complexity and real-time capability are generally objectives.In this paper,a of real-time cascaded complies strategy is proposed for a dual-mode hybrid electric that considers controller based nonlinearities based the system model and with all time-varying with constraints.sampling The strategy consists of a supervisory controller on a non-linear predictive control short(MPC)sampling a long time with future strategy interval and a coordinating on linear model predictive based control with a time interval to deal different load dynamics of the system.The Additionally,a novel data methodology using adaptive Markov chains to predict demand is introduced.predictive future information is used to improve controller cycles performance.conducted.The The proposed is implemented validity on a real test-bed approach and experimental trials using economy unknown is driving are results other demonstrate the of the proposed and show that fuel significantly improved compared with methods. | XIANG ChangLe DING Feng WANG WeiDa HE Wei QI YunLong | 2017 | Science China(Technological Sciences)2017，60，5： | 11 |
| 3 | Influence of foraminifera on formation and occurrence characteristics of natural gas hydrates in fine-grained sediments from Shenhu area, South China Sea显示文摘Marine gas hydrates accumulate primarily in coarse-grained, high-permeability layers; however, highly saturated natural gas hydrates have been discovered in the fine-grained sediments of Shenhu area, South China Sea(SCS). This may be explained by key factors, such as the great abundance of foraminifera shells. In this paper, by analyzing the SCS foraminifera structure and performing hydrate formation experiments in the foraminifera shells, the contribution of foraminifera to hydrate accumulation in the SCS was investigated from a microscopic point of view. Simulations of hydrate formation were carried out in both pure SCS foraminifera shells and the host sediments. Pore structures in typical foraminifera were studied by use of micro-focus X-ray computed tomography(CT) and scanning electron microscopy(SEM). Hydrate growth and occurrence characteristics in the foraminifera shells were observed in-situ. The results showed that the presence of foraminifera significantly enhanced the effective porosity of the SCS sediments. Moreover, while the hydrates grew preferentially in the chambers of the coarse-grained foraminifera by adhering to the inner walls of the foraminifera shells, no apparent hydrate accumulation was observed in the fine-grained or argillaceous matrix. These findings provide a basis for further studies on the accumulation mechanism of hydrates and physical properties of hydrate reservoir in the South China Sea. | LI ChengFeng HU GaoWei ZHANG Wei YE YuGuang LIU ChangLing LI Qing SUN JianYe | 2016 | Science China Earth Sciences2016，59，11： | 7 |
| 4 | Digital image processing of sectorial oscillations for acoustically levitated drops and surface tension measurement显示文摘A type of non-axisymmetric oscillations of acoustically levitated drops is excited by modulating the ultrasound field at proper frequencies. These oscillations are recorded by a high speed camera and analyzed with a digital image processing method. They are demonstrated to be the third mode sectorial oscillations, and their frequencies are found to decrease with the increase of equatorial radius of the drops, which can be described by a modified Rayleigh equation. These oscillations decay exponentially after the cessation of ultrasound field modulation. The decaying rates agree reasonably with Lamb’s prediction. The rotating rate of the drops accompanying the shape oscillations is found to be less than 1.5 rounds per second. The surface tension of aqueous ethanol has been measured according to the modified Rayleigh equation. The results agree well with previous reports, which demonstrates the possible application of this kind of sectorial oscillations in noncontact measurement of liquid surface tension. | SHEN ChangLe, XIE WenJun & WEI BingBo Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，12： | 4 |
| 5 | Periodical oscillating interface in directional growth under shear flow显示文摘Liquid-solid interface morphological evolution of SCN-2wt%H2O alloy was investigated in the presence of shear flow. It has been found that shear flow strikingly enhances the stability of planar interface at lower pulling rates. In the intermediate range of pulling rate, the interface experiences periodical oscillating 'planar-cellular' and 'cellular-dendritic' growth patterns. The formation of oscillating growth modes can be explained by two reasons: (i) The stabilizing effect induced by shear flow competes with the growing destabilizing effect by the increase of pulling rate, which provides the driving force for morphological evolution; and (ii) the establishment of stable solute field at the liquid-solid interface needs a period of time, leading to the result that the interface evolution can not stay stable at the equilibrium state. However, as the puling rate becomes higher, it plays more and more important roles in pattern selection and dendritic growth forms. | WANG JianYuan CHEN ChangLe ZHAI Wei JIN KeXin | 2009 | Chinese Science Bulletin2009，54，23： | 1 |
| 6 | Discussion on the position of the shear plane显示文摘 | Li Hang Wei Shiqiang Qing Changle | 2003 | Journal of Colloid and Interface Science2003，258，1： | 1 |
| 7 | Discussion on the position of the shear plane显示文摘 | Hang Li Shiqang Wei Changle Qing | 2003 | Journal of Colloid and Interface Science2003，258，： | 1 |
| 8 | A novel approach to the attitude stabilization structure for ducted-fan operative aerial robots:Finding improvements for modeling error and strong external transient disturbance显示文摘This research concerns a novel attitude stabilization structure for a ducted-fan aerial robot to work against modeling error and strong external transient disturbance,and it focuses on two main control targets:modeling error compensation,and the improvement of disturbance resistance along the rolling channel.For the first research objective,we proposed an adaptive nominal controller with the reconfigurable control law design based on the estimation of the modeling error found in the closed-loop.Results of simulations and corresponding flight tests verified that the proposed adaptive control structure is robust against both constant and time-varying modeling error.For the other research objective,a SAC(Stability Augmentation Control)structure was devised based on the CMG(Control Moment Gyroscope)theory in order to provide extra moment which effectively withstands the transient disturbance beyond the CDG(Critical Disturbance Gain).Furthermore,we studied the corresponding controller for the SAC via the SMC(sliding mode control)theory,while the working mechanism and performance of the SAC were verified through a specially devised prototype. | Wei FAN Bin XU Changle XIANG Yibo ZHANG Haiyang YANG | 2022 | Chinese Journal of Aeronautics2022，35，2： | 1 |
| 9 | Lattice-reduction-aided MMSE precoding for correlated MIMO channels and performance analysis显示文摘The lattice-reduction (LR) has been developed to improve the performance of the zero-forcing (ZF) precoder in multiple input multiple output (MIMO) systems. Under the assumptions of uncorrelated flat fading channel model and perfect channel state information at the transmitter (CSIT), an LR-aided ZF precoder is able to collect the full transmit diversity. With the complex LenstraLenstra-Lova′sz (LLL) algorithm and limited feedforward structure, an LR-aided linear minimum-mean-square-error (LMMSE) precoder for spatial correlated MIMO channels and imperfect CSIT is proposed to achieve lower bit error rate (BER). Assuming a time division duplexing (TDD) MIMO system, correlated block flat fading channel and LMMSE uplink channel estimator, it is proved that the proposed LR-aided LMMSE precoder can also obtain the full transmit diversity through an analytical approach. Furthermore, the simulation results show that with the quadrature phase shift keying (QPSK) modulation at the transmitter, the uncoded and coded BERs of the LR-aided LMMSE precoder are lower than that of the traditional LMMSE precoder respectively when E b / N0 is greater than 10 dB and 12 dB at all correlation coefficients. | Rui Chen Jiandong Li Changle Li Wei Liu | 2012 | Journal of Systems Engineering and Electronics2012，23，1： | 1 |
| 10 | An approach to the theory and method for determination of electrochemical properties on solid/liquid Interface: theory显示文摘 | HANG LI SHIQING WEI CHANGLE QING | 2004 | Journal of colloid and interface science2004，275，： | 1 |
| 11 | Discussion on the Position of the SheAr Plane 显示文摘 | HANG LI SHIQIANG WEI CHANGLE QING | 2003 | Journal of Colloid and Interface Science2003，258，： | 1 |
| 12 | Influence of Wall Effect on Comprehensive Controllability for Ducted Fan Aircraft显示文摘A novel coaxial ducted fan structure aircraft is proposed to enable the aircraft near vertical walls at high altitudes.The state space equation of the system can be obtained by correlation deduction and identification of the whole prototype model.Based on the duct test bench experiment and computational fluid dynamics(CFD)simulation analysis,the expressions between the different distances dWE from the rotor center of the prototype to the wall and the thrust,reaction torque,and tilting moment of the system under hovering conditions are obtained.The influence of the wall effect of the prototype is incorporated into the system model to analyze the relationship between distance dWE and the comprehensive controllability of the system.The results show that the system comprehensive controllability vector of other channels changes little with the decrease of the distance dWE,and only the controllability vector of the rolling channel increases significantly.At the same time,the tilting moment also increases significantly,which strengthens the tendency of the prototype to tilt towards the wall. | Tianfu Ai Changle Xiang Bin Xu Wei Fan Yibo Zhang | 2020 | Journal of Beijing Institute of Technology2020，29，4： | 0 |
| 13 | Role of endothelial cells in the regulation of mechanical microenvironment on tumor progression显示文摘Majority of cancer patients die from cancer metastases.The physical stimulation produced by microenvironment regulates invasive behavior of cancer cells.Blood vessel is one of the“pathways”for cancer to metastasize,in which tumor cells need to cross the endothelial barrier for intravasation and extravasation.Tumor vessels are arranged in untraditional hierarchies and characterized with rupture,bend,swell and high permeability that are beneficial to intravasation of cancer cell.Abnormal vessels are accompanied with uneven blood flow,increased compression and interstitial fluid pressure.Meanwhile,excessive proliferation of tumor leads to low oxygen pressure in solid tumor.The aberrant tumor mechanical microenvironment changes the biochemical and mechanical signal transduction of endothelial cells and participates in tumor progression.Many current researches focus on how chemical signals regulate endothelial cell function while the role of physical cues is unclear.In this review,the role of endothelial cells in the regulation of shear stress,intercellular force,extracellular matrix and pressure on tumor progression is summarized. | Changling Wei Mei Tang Zhiling Xu Li Yang Yonggang Lv | 2021 | Acta Mechanica Sinica2021，37，2： | 0 |
| 14 | VERIFICATION-ORIENTED ROBDD OPERATION DESIGN显示文摘This paper describes a new BDD(Binary Decision Diagram) that use SCOAP value for its path. Based on analysis of BDD and input variables, variable ordering and reducing algorithms for BDD operation that are constructed by circuits description of netlist are proposed. Further, several bench nark circuits are shown to verify the efficient methods. | He Xinhua(Armoured Force Engineering Institute, Beijing 100072)Lu Changling Wei Daozheng(Institute of Computing Technology, Academj’a Sinica, Beijing 100080) | 1996 | Journal of Electronics(China)1996，13，1： | 0 |
| 15 | Theoretical and Experimental Investigations of Gyroplane Jump Takeoff Dynamics显示文摘A nonlinear and time-varying gyroplane jump takeoff dynamics model considering the unsteady ground effect and the rapid blade-pitch increase(RBPI) is developed and validated against the experiment data.The precisions of the proposed model,an experienced Hollmann model and three other simplified models are compared by displaying the height and rpm time histories of those models and the experimental data.The mean square errors(MSE) of the height histories and maximum height errors(MHE) between those models are calculated and given out.The statistics provide a kind of evaluation method of importance of the unsteady ground effect,RBPI,and the induced velocity on jump takeoff performance in vertical phase.The impact of the unsteady ground effect and RBPI on the thrust and induced velocity of the experimental rotor of a small scale platform is analyzed.The study indicates that the proposed model agrees better with the experimental data than other models.It is useful for predicting the gyroplane jump takeoff performance for design. | Xingbang Yang Changle Xiang Bin Xu Wei Fan | 2017 | Journal of Harbin Institute of Technology(New Series)2017，24，3： | 0 |
| 16 | Long-term exercise training inhibits inflammation by suppressing hippocampal NLRP3 in APP/PS1 mice显示文摘Behavioral experiments have demonstrated that long-term physical exercise can be beneficial for learning and memory dysfunction caused by neuroinflammation in Alzheimer's disease(AD).However,the molecular mechanism remains poorly understood due to a lack of sufficient pertinent biochemical evidence.We investigated the potential effect of long-term physical exercise on cognition and hippocampal gene and protein expression changes in a transgenic AD mouse model.Following twenty weeks of treadmill exercise,transgenic AD mice showed improvement in cognitive functions and downregulation of Nod-like receptor protein 3(NLRP3)(p<0.01),interleukin-1beta(IL-1β)(p<0.05),and amyloid-β1-42(Aβ1-42)(p<0.05)expression levels.In addition,we observed significant reductions of microglial activation and hippocampal neuronal damage in the exercised AD mice(p<0.01),which might be a result of the downregulation of NLRP3-mediated signaling and neuroinflammatory responses.As neuronal damage due to inflammation might be a likely cause of AD-associated cognitive dysfunction.Our results suggested that the anti-inflammatory effects of exercise training involved downregulating the expression of key inflammatory factors and might play an important role in protecting hippocampal neurons against damage during the course of AD. | Xue Li Yu Jin Xianyi Ding Tongyang Zhu Changling Wei Li Yao | 2023 | Sports Medicine and Health Science2023，5，4： | 0 |
| 17 | Molecular Properties of the Epstein-Barr virus BFRF3 Gene显示文摘Dear Editor,We report the results of cloning,expression,subcellular localization analysis,and molecular properties of the Epstein-Barr virus (EBV) BFRF3 gene,using several bioinformatics tools.Bioinformatics analysis indicated that the encoding protein of EBV BFRF3 gene (designated BFRF3) has a conserved Herpes_capsid domain,which was found to be closely related to the gammaherpesvirus capsid protein family,and is highly conserved among its counterparts.Multiple nucleic acid sequence and amino acid (aa) sequence alignments suggested that BFRF3 has a relatively higher | Mingsheng Cai Zhiyao Zhao Wei Cui Lin Yang Junyi Zhu Yalan Chen Changling Ma Zhuqing Yuan Meili Li | 2013 | Virologica Sinica2013，28，6： | 0 |
| 18 | Joint Transceiver Design for OFDM Systems显示文摘Orthogonal Frequency Division Multiplexing(OFDM) is an effective technique to deal with a frequency selective channel since it can convert the channel into some flat fading subchannels.However,very different output SNR values of the subchannels will lead to poor bit error performance when a linear equalizer and Equal Bit Allocation(EBA) are adopted in OFDM systems.So,we proposed three novel nonlinear Joint Transceiver(JT) schemes based on Zero-Forcing(ZF) criterion and Minimum Mean Square Error(MMSE) criterion respectively,which can transform all subchannels of an OFDM system into subchannels with identical channel gain.Thus,EBA is equivalent to the Optimum Bit Allocation(OBA) for these subchannels.Numerical analysis helps us to obtain the theoretical approximate BER values of the JT scheme.Simulation results verify the numerical analysis and confirm that the performance of our proposed JT scheme greatly outperforms the traditional linear equalizer with EBA at moderate and high SNR values. | Chen Rui Li Jiandong Li Changle Liu Wei | 2012 | China Communications2012，9，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员