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Nano Research 2025年第1期18卷 607-617页

作者： Ruo-Lin Jiang Hui-Na Liu Yu-Fan Yang zhi-cheng Zhang Qi Dai Xiao-Yan Bao Lin-Jie Wu Ya-Xin Qin Xin Tan Xiao-Yan Sun Xu-Fang Ying zhi-Qing Ben Min Han Institute of Pharmaceutics College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China Department of Radiation Oncology Key Laboratory of Cancer Prevention and InterventionThe Second Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310058China Hangzhou Institute of Innovative Medicine Zhejiang UniversityHangzhou 310058China Jinhua Institute of Zhejiang University Jinhua 321299China National Key Laboratory of Advanced Drug Delivery and Release Systems Zhejiang UniversityHangzhou 310058China Polytechnic institute Zhejiang UniversityHangzhou 310015China

Traditionally,hyaluronic acid has been widely used for drug delivery,but the current application bottleneck is that hyaluronic acid is hydrophilic and electronegative,which makes it difficult to carry hydrophobic drugs and small interfering RNA(siRNA)with the same *** on previous studies,we designed and synthesized hyaluronic acid nanocarriers HA-spermine/N,N,N-trimethylcystamine/DOX-TPP(HSTD)for loading siRNA to overcome the problem of siRNA release caused by strong electrostatic ***,N,N,Ntrimethylcystamine in the carrier can be degraded by intracellular glutathione to completely and rapidly release siRNA,thus promoting ***,when codelivered with the chemotherapy drug doxorubicin(DOX),this novel nanocarrier showed promising synergy in inhibiting tumor growth.

关键词： zwitterionic hyaluronic acid N N N-trimethylcystamine small interfering RNA(siRNA) doxorubicin

Trivial extension of Koszul algebras

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Frontiers of Mathematics in China 2017年第5期12卷 1045-1056页

作者： zhi cheng School of Mathematics and Computer Science Anhui Normal University Wuhu 241002 China

Let A be a Koszul algebra, and let M be a graded A-bimodule. We prove that the trivial extension algebra of A by M is also a Koszul algebra whenever M is Koszul as a left A-module. Applications and examples are also p... 详细信息

关键词： Koszul algebra Koszul module trivial extension

One-Point Extensions of t-Koszul Algebras

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Acta Mathematica Sinica,English Series 2007年第6期23卷 965-972页

作者： zhi cheng Department of Mathematics Anhui Normal University Wuhu 241000 P. R. China Department of Mathematics University of Science and Technology of ChinaHefei 230026 P. R. China Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China USTC Shanghai Institute for Advanced Studies Shanghai 201315 P. R. China

We introduce the category of t-fold modules which is a full subcategory of graded modules over a graded algebra. We show that this subcategory and hence the subcategory of t-Koszul modules are both closed under extensions and cokernels of monomorphisms. We study the one-point extension algebras, and a necessary and sufficient condition for such an algebra to be t-Koszul is given. We also consider the conditions such that the category of t-Koszul modules and the category of quadratic modules coincide.

关键词： graded algebra Koszul algebra Koszul module

Combining SVM and CHMM classifiers for porno video recognition

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The Journal of China Universities of Posts and Telecommunications 2012年第3期19卷 100-106页

作者： ZHAO zhi-cheng School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Key Laboratory of Network System and Network Culture Beijing University of Posts and Telecommunications Beijing 100876 China

Pomo video recognition is important for Intemet content monitoring. In this paper, a novel pomo video recognition method by fusing the audio and video cues is proposed. Firstly, global color and texture features and local scale-invariant feature transform （SIFT） are extracted to train multiple support vector machine （SVM） classifiers for different erotic categories of image frames. And then, two continuous density hidden Markov models （CHMM） are built to recognize porno sounds. Finally, a fusion method based on Bayes rule is employed to combine the classification results by video and audio cues. The experimental results show that our model is better than six state-of-the-art methods.

关键词： pomo video recognition SVM keyframe CHMM audio

RMAC： A Reliable MAC Protocol Supporting Multicast for Wireless Ad Hoc Networks

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Journal of Computer Science & Technology 2005年第5期20卷 702-712页

作者： Wei-Sheng Si cheng-zhi Li School of Software Dalian University of Technology P.R. China Department of Computer Science and Engineering University of Texas at Arlington U.S.A.

This paper presents a new reliable MAC protocol called “RMAC”supporting reliable multicast for wireless ad hoc networks. By utilizing the busy tones to realize the multicast reliability, RMAC has three novelties：（1） it uses a variablelength control frame to stipulate an order for the receivers to respond, thus solving the feedback collision problem; （2） it extends the usage of busy tone for preventing data frame collisions into the multicast scenario; and （3） it introduces a new usage of busy tone for acknowledging data frames positively. In addition, RMAC is generalized into a comprehensive MAC protocol that provides both reliable and unreliable services for all the three modes of communications： unicast, multicast, and broadcast, making it capable of supporting various upper-layer protocols. The evaluation shows that RMAC achieves high reliability with very limited overhead. RMAC is also compared with other reliable MAC protocols, showing that RMAC not only provides higher reliability but also involves lower cost.

关键词： wireless ad hoc network medium access control reliable multicast busy tone

Real-time full-color meta fiber endoscopy

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Light(Science & Applications) 2023年第8期12卷 1452-1453页

作者： Changyuan Yu zhi cheng Jiaqi Qu Photonics Research Institute Department of Electrical and Electronic EngineeringThe Hong Kong Polytechnic UniversityHong KongChina

The remarkable capacity of metasurfaces to exert precise control over the propagation of light has ushered in a realm of unprecedented possibilities for"Lab-on-fiber",and in this work,showcased real-time full-color im... 详细信息

关键词： fiber full precise

K+-enhanced electrocatalytic CO_(2) reduction to multicarbon products in strong acid

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Rare Metals 2022年第3期41卷 723-725页

作者： Jun-Jun Li zhi-cheng Zhang Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China

Electrocatalytic CO_(2) reduction reaction(CO_(2) RR)has been regarded as a highly effective strategy to produce valuable fuels and feedstocks,contributing to achieving a carbon–neutral cycle and dramatically mitigating CO_(2) emission[1–6].Generally,alkaline or near-neutral solution,such as KOH or KHCO3aqueous solution,is employed as elec-trolytes for CO_(2) RR owing to higher solubility of CO_(2) in electrolytes[1,7–10].

关键词： neutral carbon solubility

Approach for analyzing the ultimate strength of concrete filled steel tubular arch bridges with stiffening girder

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 682-692页

作者： ZHANG zhi-cheng XIE Xu ZHANG He CHEN Heng-zhi Department of Civil Engineering Zhejiang University Hangzhou 310027 China

A convenient approach is proposed for analyzing the ultimate load carrying capacity of concrete filled steel tubular (CFST) arch bridge with stiffening girders. A fiber model beam element is specially used to simulate the stiffening girder and CFST arch rib. The geometric nonlinearity, material nonlinearity, influence of the construction process and the contribution of prestressing reinforcement are all taken into consideration. The accuracy of this method is validated by comparing its results with experimental results. Finally, the ultimate strength of an abnormal CFST arch bridge with stiffening girders is investigated and the effect of construction method is discussed. It is concluded that the construction process has little effect on the ultimate strength of the bridge.

关键词： Ultimate strength Concrete filled steel tubular (CFST) arch bridge Stiffening girder Fiber model beam element Construction process

Sn-Bi bimetallic interface induced by nano-crumples for CO_(2) electroreduction to formate

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Rare Metals 2022年第12期41卷 3943-3945页

作者： Li Li zhi-cheng Zhang Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China

Electrochemical carbon dioxide(CO_(2))reduction reaction(CO_(2)RR),powered by a renewable energy source,to valueadded chemicals and fuels is a promising solution to mitigate the ever-increasing CO_(2)emission and buil... 详细信息

关键词： dioxide carbon Electrochemical

Single neuron network PI control of high reliability linear induction motor for Maglev

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 408-411页

作者： FANG You-tong FAN cheng-zhi College of Electrical Engineering Zhejiang University Hangzhou 310027 China

The paper deals with a new model of linear induction motor (LIM) to improve the reliability of the system. Based on the normal equation circuit of LIM considering the dynamic end effect, an equivalent circuit model with compensation of large end effect is constructed when the end effect force at synchronism is of braking character. The equivalent circuit model is used for secondary-flux oriented control of LIM. Single neuron network PI unit for LIM servo-drive is also discussed. The effectiveness of mathematical model for drive control is verified by simulations.

关键词： Linear induction motor (LIM) Field-oriented control End effect