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Quantitative structure-activity relationship study on the biodegradation of acid dyestuffs

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Journal of Environmental Sciences 2007年第7期19卷 800-804页

作者： li Yin xi Dan-li College of Environmental Science and Engineering Dong Hua University Shanghai 201620 China.

Quantitative structure-biodegradability relationships （QSBRs） were established to develop predictive models and mechanistic explanations for acid dyestuffs as well as biological activities. With a total of four descriptors, molecular weight （MW）, energies of the highest occupied molecular orbital （EHOMO）, the lowest unoccupied molecular orbital （ELUMO）, and the excited state （EES）, calculated using quantum chemical semi-empirical methodology, a series of models were analyzed between the dye biodegradability and each descriptor. Results showed that EHOMO and Mw were the dominant parameters controlling the biodegradability of acid dyes. A statistically robust QSBR model was developed for all studied dyes, with the combined application of EHOMO and Mw. The calculated biodegradations fitted well with the experimental data monitored in a facultative-aerobic process, indicative of the reliable prediction and mechanistic character of the developed model.

关键词： quantitative structure-activity relationship (QSAR) acid dyestuff biodegradability decolorization

Square-mean Almost Periodic Solutions to Some Stochastic Evolution Equations

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Acta Mathematica Sinica,English Series 2014年第5期30卷 881-898页

作者： xi liang li School of Mathematics and Information Sciences Shandong Institute of Business and Technology

This paper concerns the square-mean almost periodic mild solutions to a class of abstract nonautonomous functional integro-differential stochastic evolution equations in a real separable Hilbert space. By using the so-called ＂Acquistapace–Terreni＂ conditions and the Banach fixed point theorem, we establish the existence, uniqueness and the asymptotical stability of square-mean almost periodic solutions to such nonautonomous stochastic differential equations. As an application, almost periodic solution to a concrete nonautonomous stochastic integro-differential equation is considered to illustrate the applicability of our abstract results.

关键词： Square-mean almost periodicity functional integro-differential equations "AcquistapaceTerreni" conditions evolution family

One stone two birds:Dual-effect kinetic regulation strategy for practical lithium–sulfur batteries

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Journal of Energy Chemistry 2022年第2期31卷 302-303页

作者： xi-Yao li Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

lithium–sulfur(li–S)batteries are deemed as one of the most promising energy storage systems due to their ultrahigh theoretical energy density of 2600 Wh kg^(-1) far beyond the current lithium-ion battery technique[1].

关键词： battery lithium Dual

Crystal plasticity behavior of single-crystal pure magnesium under plane-strain compression

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Rare Metals 2017年第7期36卷 541-549页

作者： Bai-li xi Gang Fang Department of Mechanical Engineering Tsinghua University Beijing 100084China State Key Laboratory of Tribology Beijing 100084China

A phenomenological crystal plasticity constitu- tive model for magnesium single crystal was presented. Four deformation mechanisms （including basal （a）, pris- matic （a）, pyramidal （c ＋ a） slip and tension twin） and their interactions were considered. Twin-induced lattice reorientation was also incorporated in the model. The proposed model was then applied to the simulation of plane-strain compression deformation for different orien- tations. Related material parameters were calibrated at first according to the classical channel-die tests. The predicted macro-and microscopic responses, along with the experi- mental results, show strong orientation-dependent proper- ties. It is also found in the simulation that basal slip in the twinned region is active even before the saturation of twin activity in a twin-favored case. Furthermore, the effect of an initial deviation angle on the mechanical responses was evaluated, which is proved to be also orientation-depen- dent. Basal slip is found to be easily activated due to a slight deviation, while a slight deviation in the twin-fa- vored case could result in a significant difference in the mechanical behavior after the reorientation. The effort on the study of magnesium single crystal in the present work contributes to further polycrystalline analysis.

关键词： Magnesium Crystal plasticity Slip and twin Orientation deviation

Travelling Solitary Wave Solutions for Generalized Time-delayed Burgers-Fisher Equation

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Communications in Theoretical Physics 2009年第8期52卷 284-286页

作者： DENG xi-Jun HAN li-Bo li xi School of Information and Mathematics Yangtze University Jingzhou 434023 China College of Physical Science and Technology Yangtze University Jingzhou 434023 China Department of Mathematics University of Kansas Kansas 66045 USA

In this paper,travelling wave solutions for the generalized time-delayed Burgers-Fisher equation *** using the first-integral method,which is based on the ring theory of commutative algebra,we obtain aclass of travelling solitary wave solutions for the generalized time-delayed Burgers-Fisher equation.A minor error in theprevious article is clarified.

关键词： solitary wave first-integral method ring theory time-delayed Burgers-Fisher equation

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Journal of Systems Engineering and Electronics 2020年第6期31卷 1167-1177页

作者： PENG Han CHENG Ting li xi School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

In target tracking applications,the Doppler measurement contains information of the target range rate,which has the potential capability to improve the tracking ***,the nonlinear degree between the measurement and the target state increases with the introduction of the Doppler ***,target tracking in the Doppler radar is a nonlinear filtering *** order to handle this problem,the Kalman filter form of best linear unbiased estimation(BLUE)with position measurements is proposed,which is combined with the sequential filtering algorithm to handle the Doppler measurement further,where the statistic characteristic of the converted measurement error is calculated based on the predicted information in the sequential ***,the algorithm is extended to the maneuvering target tracking case,where the interacting multiple model(IMM)algorithm is used as the basic framework and the model probabilities are updated according to the BLUE position filter and the sequential filter,and the final estimation is a weighted sum of the outputs from the sequential filters and the model *** results show that compared with existing approaches,the proposed algorithm can realize target tracking with preferable tracking precision and the extended method can achieve effective maneuvering target tracking.

关键词： Kalman filter best linear unbiased estimation(BLUE) measurement conversion sequential filter

Online adaptive dwell scheduling based on dynamic template for PAR

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Journal of Systems Engineering and Electronics 2021年第5期32卷 1119-1129页

作者： TAN Qianqian CHENG Ting li xi School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

An adaptive dwell scheduling algorithm for phased array radar(PAR)is proposed in this *** concept of online dynamic template is introduced,based on which a general pulse interleaving technique for PAR is put *** pulse interleaving condition of the novel pulse interleaving is more intuitive and *** traditional adaptive dwell scheduling algorithm combined with the general novel pulse interleaving technique results in the online adaptive dwell scheduling based on dynamic template for PAR is *** proposed algorithm is suitable for radar tasks with multiple pulse repetition intervals(PRIs),which can be utilized in the actual radar *** the purpose of further improving the scheduling efficiency,an efficient version is *** results demonstrate the effectiveness of the proposed algorithm and the efficient *** proposed efficient algorithm can improve the time utilization ratio(TUR)by 9%,the hit value ratio(HVR)by 3.5%,and reduce the task drop ratio(TDR)by 6%in comparison with existing dwell scheduling algorithms considering pulse interleaving in PAR and the proposed efficient one.

关键词： dynamic template dwell scheduling pulse interleaving

Scalable peer-to-peer resource discovering scheme for wireless self-organized networks

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The Journal of China Universities of Posts and Telecommunications 2009年第2期16卷 47-52,57页

作者： li xi JI Hong Key Laboratory of Universal Wireless Communications Minisa-y of Education Beijing University of Posts and Telecommunications Beijing 100876 China

Peer-to-peer technologies have attracted increasing research attention with fruitful protocols and applications proposed for wired networks. As to mobile environments, there are currently no mature deployments. A novel resource managing and discovering protocol, Cheer, is proposed to realize scalable and effective peer-to-peer lookup in wireless self-organized networks. Cheer resolves the topologies mismatch problem between peer-to-peer overlay networks and actual nodes distribution, allowing for frequent nodes membership changes. With specially designed resource storage table, Cheer also supports multikey and fuzzy lookup. Its hybrid architecture and improved routing scheme based on small-world theory may realize effective lookup routing. Theoretical analysis and simulation results both prove that Cheer makes using peer-to-peer applications in large-scale self-organized mobile networks feasible and promising.

关键词： peer-to-peer small-world resource discovering

NUMERICAL SIMULATIONS OF NONliNEAR WAVE TRANSFORMATION AROUND WAVE-PERMEABLE STRUCTURE

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Journal of Hydrodynamics 2005年第6期17卷 699-703页

作者： li xi YAN Yi-xin Department of Ocean Engineering Hohai University Nanjing 210098 China

The problem of wave partial/full reflection and transmission by wave-permeable structure is approached by solving the shape-related function with focus on the understanding of wave attenuation. 2D depth averaged Boussinesq type wave equations are given with new damping item in simulating the nonlinear wave transmission through wave-permeable structure. 1D wave equation is examined to give the analytical expression of the absorbing coefficient, and is compared with laboratory data in flume to calibrate the coefficients, and the expression is applied directly in modified Boussinesq type equations. Compared with wave basin data for various incident wave conditions, the accurate predictions of combined diffraction refraction effects in simulating nonlinear wave going through wave-permeable breakwater in the engineering application can be obtained. It shows that wave-permeable breakwaters with proper absorbing effects can be used as an effective alternative to massive gravity breakwaters in reduction of wave transmission in shallow water.

关键词： Boussinesq equations wav-absorbing coeffieient wave permeable breakwaters