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A Convenient and Stereospecific Synthesis of (Z)-Benzylidenephthalides

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Chinese Chemical Letters 2001年第11期12卷 955-956页

作者： Wang, ZW Li, sb Lanzhou Univ Natl Lab Appl Organ Chem Lanzhou 730000 Peoples R China

A convencient and stereospecific synthesis of (Z)-benzylidenephthalides, including thunberginol F, from phthalides is described.

关键词： benzylidenephthalides phthalides synthesis

A Facile Synthetic Approach to Two Chalcones

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Chinese Chemical Letters 2001年第11期12卷 957-958页

作者： Du, ZT Li, sb Lanzhou Univ Inst Organ Chem Natl Lab Appl Organ Chem Lanzhou 730000 Peoples R China

A facile synthetic route for two chalcone analogues was developed. The key step was selective deprotection of MOM in aryl methyl ether 6 by silica gel.

关键词： chalcone synthesis

Online Demand Response Characterization Based on Variability in Customer Behavior

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 936-946页

作者： Lester Marrero Daniel sbárbaro Luis García-Santander the Department of Electrical Engineering University of ConcepciónConcepción 4070409Chile

This paper proposes an online framework to characterize demand response(DR)over *** proposed framework facilitates obtaining and updating the daily consumption patterns of *** essential concept of response profile class(RPC)is introduced for characterization and complemented by the measure of the variability in customer *** paper uses a modified version of the incremental clustering by fast search and find of density peaks(CFSFDP)algorithm for daily profiles,considering the multivariate normal kernel density estimator and incremental forms of the Davies-Bouldin(i DB)and Xie-Beni(i XB)validity *** studies conducted using real-world and simulated daily profiles of residential and commercial Chilean end-users have demonstrated how the proposed framework can continuously characterize *** proposed framework is proven to achieve realistic customer models for effective energy management by estimating the customer response to price signals at the distribution system operator(DSO)level.

关键词： Demand response(DR) incremental indice online characterization online clustering response profile class(RPC)

Crustal structure in western Tibetan Plateau

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Chinese Science Bulletin 1997年第8期42卷 665-669页

作者： Xiong, sb Liu, HB Institute of Geophysics Chinese Academy of Sciences Beijing China

USING explosional seismic data from the profile of Coqen,Dongco,Gerze,Lugu to Sangehu inwestern Tibet,we studied the structure and tectonic of the crust of the north-west Qinghai-Xizang(Tibet)***-Nujiang Suture Zone(B... 详细信息

关键词： western Tibetan plateau explosional seismology crustal structures.

Stochastic Ranking Improved Teaching-Learning and Adaptive Grasshopper Optimization Algorithm-Based Clustering Scheme for Augmenting Network Lifetime in WSNs

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China Communications 2024年第9期21卷 159-178页

作者： N Tamilarasan sb Lenin P Mukunthan NC Sendhilkumar Department of Electronics and Communications Engineering Sri Indu College of Engineering and TechnologyHyderabadTelanganaIndia Department of Electronics and Communications Engineering Sri Manakula Vinayagar Engineering CollegePondicherryIndia

In Wireless Sensor Networks(WSNs),Clustering process is widely utilized for increasing the lifespan with sustained energy stability during data *** clustering protocols were devised for extending network lifetime,but most of them failed in handling the problem of fixed clustering,static rounds,and inadequate Cluster Head(CH)selection criteria which consumes more *** this paper,Stochastic Ranking Improved Teaching-Learning and Adaptive Grasshopper Optimization Algorithm(SRITL-AGOA)-based Clustering Scheme for energy stabilization and extending network *** SRITL-AGOA selected CH depending on the weightage of factors such as node mobility degree,neighbour's density distance to sink,single-hop or multihop communication and Residual Energy(RE)that directly influences the energy consumption of sensor *** specific,Grasshopper Optimization Algorithm(GOA)is improved through tangent-based nonlinear strategy for enhancing the ability of global *** the other hand,stochastic ranking and violation constraint handling strategies are embedded into Teaching-Learning-based Optimization Algorithm(TLOA)for improving its exploitation ***,SR and VCH improved TLOA is embedded into the exploitation phase of AGOA for selecting better CH by maintaining better balance amid exploration and *** results confirmed that the proposed SRITL-AGOA improved throughput by 21.86%,network stability by 18.94%,load balancing by 16.14%with minimized energy depletion by19.21%,compared to the competitive CH selection approaches.

关键词： Adaptive Grasshopper Optimization Algorithm(AGOA) Cluster Head(CH) network lifetime Teaching-Learning-based Optimization Algorithm(TLOA) Wireless Sensor Networks(WSNs)

Luminescence Properties of the Ternary Terbium Complexes with (Ortho and Para) Aminobenzoic acids and 1,10-Phenanthroline Incorporated in Silica Matrix by a Sol-gel Method

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Chinese Chemical Letters 1997年第7期8卷 633-636页

作者： Yan, B Zhang, HJ Wang, sb Ni, JZ CHINESE ACAD SCI CHANGCHUN INST APPL CHEMLAB RARE EARTH CHEM & PHYSCHANGCHUN 130022PEOPLES R CHINA

Ternary complexes of terbium with ortho (and pam) aminobenzoic acid and 1,10-phenanthroline were introduced into silica gel by the sol-gel method. The luminescence behavior of the solid-state samples was studied durin... 详细信息

关键词： ABA Luminescence Properties of the Ternary Terbium Complexes with Aminobenzoic acids and 1,10-Phenanthroline Incorporated in Silica Matrix by a Sol-gel Method Ortho and Para

Hartree-Fock quantum Monte Carlo method

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Chinese Science Bulletin 1997年第13期42卷 1090-1093页

作者： Huang, HX Xie, QJ Cao, ZX Liu, sb Department of Chemistry Hunan Normal University Changsha 410081 China

QUANTUM Monte Carlo (QMC) approach has already been successfully utilized in quantumchemistry. However, QMC algorithm brings statistical errors that are sharply increasedas the investigated system is enlarged. We proposed in terms of correlated sampling a novel al-gorithm with a better precision and a smaller error. However, the modified QMC methodproposed has still two problems: (i) the 'random term' in the process of calculation is un-

关键词： Hartree-Fock quantum Monte Carlo method local energy statistical error.

Luminescence LB films of rare earth complexes with monooctadecyl phthalate

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Chinese Science Bulletin 1997年第10期42卷 825-828页

作者： Li, B Zhang, HJ Ma, JF Wang, sb Ni, JZ Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun China

THE Langmuir-Blodgett film has a good prospect of application in molecular electronics,inte-grated options,information storage,chemistry and biosensor since it is ultrathin,homoge-neous and can be arbitrarily assembled on molecular *** are becoming interested ininducting functional rare earth complexes to LB *** a kind of polymer having indef-inite chain structure,rare earth carboxylate complexes have both good luminescence

关键词： rare earth complex monooctadecyl phthalate LB film luminescence.

Toughening of Epoxy Resin with Microspheres

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Journal of Materials Science & Technology 1996年第1期12卷 46-50页

作者： Jin, SJ Feng, sb Pang, JQ Hua, XL Li, YM Yu, YH Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

Special microspheres dispersed in epoxy resin prior to curing can toughen brittle resin by formation of a second phase. In this work, rigid particles (HP), hollow particles (PO) and rubber powders (PR) are used to modify epoxy resins for the study on the toughening mechanism. The single-edge notched three-point bending test and T peel test have been used to measure the toughness of epoxy resin. The morphology (particle/matrix interfacial shape) of epoxy resin modified with these three kinds of microspheres has been investigated by transmission electron microscopy (TEM). The results show that these three kinds of modifiers are all effective, and the core-shell rubber particle (PR) is the best toughening modifier among them. It is also found that the toughening effect is dependent on the morphology of the interface between the particles and matrix and the different curing conditions really result in obviously different interface states. The excellent interfacial interaction plays a significant role in toughening epoxy resin.

关键词： Epoxy resins