检索结果-南通市图书馆

Adaptive PID Control for Hydraulic Turbine Regulation Systems Based on INGWO and BPNN

在线全文

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2024年第4期9卷 126-146页

作者： Jinbao Chen gang he Yunhe Wang Yang Zheng Zhihuai Xiao the China Yangtze River Electric Power Co. Ltd.Wuhan 430000China the School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China the hebei Fengning Pumped Storage Co. Ltd.Chengde 050300China

To ensure system stability,the fixed-PID(F-PID)controller with small parameters is usually adopted in hydropower *** involves a slow setting speed and it is difficult to realize optimal control for full working *** address the problem,this paper designs a variable-PID(V-PID)controller for a hydraulic turbine regulation system(HTRS)based on the improved grey wolf optimizer(INGWO)and back propagation neural networks(BPNN).These can achieve excellent regulation under full working ***,the nonlinear HTRS model containing the nonlinear hydroturbine model is constructed and the stable domain is obtained using Hopf bifurcation theory to determine the available range of PID *** optimal PID parameters in typical working conditions are then calculated by the INGWO,and the optimal PID parameters are generalized through training the V-PID neural networks which take the optimal PID parameters as sample *** V-PID neural networks with different structures are compared to determine the optimal structure of the variable-PID controller *** V-PID controller-based nonlinear HTRS model shows that the PID parameters can be automatically adjusted online according to the working condition changes,realizing optimal control of hydropower units in full working conditions.

关键词： Hydraulic turbine regulation system back propagation neural networks Hopf bifurcation grey wolf optimizer variable-PID controller

Synthesis of 2,3-Fused Indoline Aminals via 4+2 Cycloaddition of NH-free Benzazetidines with Indoles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2019年第2期37卷 119-125页

作者： Zibo Bai Huarong Tong Hao Wang Gong Chen gang he State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300071China

Summary of main observation and conclusion A 4+2 cycloaddition reaction of NH-free benzazetidines with indoles under the catalysis of camphorsulfonic acid was developed. This method shows a broad substrate scope of benzazetidines and indoles, and offers a convenient method for stereoselective synthesis of various cis-2,3-fused indoline aminals. Preliminary mechanistic studies suggest the reaction proceed via a stepwise pathway featuring an electrophilic attack on the benzylic carbon of benzazetidine.

关键词： Synthesis of 2,3-Fused Indoline Aminals 4+2 Cycloaddition of NH-free Benzazetidines with Indoles

Synthesis of reversible PAD4 inhibitors via copper-catalyzed C-H arylation of benzimidazole

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第5期62卷 592-596页

作者： Zhengwei Guo Lai Shi Bo Wang gang he Yanming Wang Gong Chen State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryNankai University School of Life Sciences Henan University Department of Biochemistry and Molecular Biology The Pennsylvania State University

PAD4 is a promising epigenetic drug target for various cancers and immune diseases. In this work, we applied a Cu-catalyzed C–H arylation reaction of N-heteroarene to the synthesis of complex non-covalent PAD4 inhibitors bearing a bi-heteroaryl pharmacophore. This strategy allowed us to access various analogs of C_2-aryl substituted benzimidazoles from a common benzimidazole core and easily accessible aryl iodides. Preliminary SAR studies revealed the indole motif of GSK-484 is critical to its activity. Replacing the N-cyclopropylmethyl group to N-benzyl group on the indole ring of GSK-484 resulted in more than5-fold increase in cell killing efficacy against 4T1 cell line.

关键词： C–H arylation benzimidazoles PAD4 inhibitor copper catalysis

Enzymatic Synthesis and Characterization of Novel Polycarbonates Derived from 5-Allyloxy-1, 3-dioxan-2-one and 5, 5-Dimethvl-1.3-dioxan-2-one

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第10期17卷 1385-1387页

作者： Yan Ping WANG Feng he gang LIU Ren Xi ZHUO Key Laboratory of Biomedical Polymers of Ministry of Education Department of Chemistry Wuhan University Wuhan 430072

Novel polycarbonates from 5-allyloxy-1, 3-dioxan-2-one （ATMC） with 5, 5-dimethyl- 1, 3-dioxan-2-one （DTC） were successfully synthesized for the first time using immobilized porcine pancreas lipase （IPPL） as catalyst. The resulting copolymers were characterized by IR, ^1H NMR, ^13C NMR and GPC. The molecular weight （Mn） of the copolymer with molar feed ratio of 10：90 （ATMC：DTC） was 9300 and the polydispersity was 1.31, while the Mn increased to 14300 and polydispersity of 1.25 with the feed ratio of 50：50. Moreover, the composition of the copolymers agreed well with the monomer feed.

关键词： 5-Allyloxy-1 3-dioxan-2-one 5 5-dimethyl-1 3-dioxan-2-one enzyme-catalyzed ring opening polymerization polycarbonates.

Efficient preparation of β-hydroxy aspartic acid and its derivatives

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2018年第7期29卷 1113-1115页

作者： Long Liu Bo Wang Cheng Bi gang he Gong Chen State Key Laboratory and Institute of Elemento-Organic Chemistry College of Chemistry Nankai University Tianjin 300071 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300071 China

We report an efficient and practical synthetic route to various properly-protected erythreo-β-OH-Asp compounds, which are key β-branched a-amino acid units in coralmycin A and other peptide natural products. Fmoc and cyclic ketal-protected erythreo-β-OH-Asp 7 is prepared from cheap chiral precursor L-diethyl tortrate in six steps without the need of column purification. The modified form of 7 serves as a versatile precursor to various β-alkoxyl analogs of erythreo-β-OH-Asp. In addition, we successfully performed a model study toward the total synthesis of coralmycin A, featuring a late stage installation of the side chain primary amide group of erythreo-β-OMe-Asn.

关键词： Amino acid Natural product Erythreo-β-OH-Asp Erythreo-β-OMe-Asn Antibiotics

The Orthogonal Bases of Exponential Functions Based on Moran-Sierpinski Measures

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第7期40卷 1804-1824页

作者： Qi Rong DENG Xing gang he Ming Tian LI Yuan Ling YE School of Mathematics and Statistics Center for Applied Mathematics of Fujian Province&Key Laboratory of Analytical Mathematics and Applications(Ministry of Education)Fujian Normal UniversityFuzhou350117P.R.China School of Mathematics and Statistics Key Lab NAA-MOE and Hubei Key Lab-Math.Sci.Central China Normal UniversityWuhan430079P.R.China School of Mathematical Sciences&South China Research Center for Applied Mathematics and Interdisciplinary Studies South China Normal UniversityGuangzhou510631P.R.China

Let An∈M2(ℤ)be integral matrices such that the infinite convolution of Dirac measures with equal weightsμ{A_(n),n≥1}δA_(1)^(-1)D*δA_(1)^(-1)A_(2)^(-2)D*…is a probability measure with compact support,where D={(0,0)^(t),(1,0)^(t),(0,1)^(t)}is the Sierpinski *** prove that there exists a setΛ⊂ℝ2 such that the family{e2πi〈λ,x〉:λ∈Λ} is an orthonormal basis of L^(2)(μ{A_(n),n≥1})if and only if 1/3(1,-1)A_(n)∈Z^(2)for n≥2 under some metric conditions on A_(n).

关键词： Moran-Sierpinski measures orthonormal basis of exponential functions self-affine measures spectral measures

Graphene quantum dots modulated solution-derived InGaO thin-film transistors and stress stability exploration

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第7期42卷 2294-2306页

作者： Xiao-Fen Xu gang he Lei-Ni Wang Wen-Hao Wang Xiao-Yu Wu School of Materials Science and Engineering Anhui UniversityHefei230601China

Graphene quantum dots(GQDs)doped InGaO(IGO)thin film transistors(TFTs)have been fabricated based on solution-driven ZrO_(x) as gate *** to pure IGO TFTs,superior electrical performance of the GQDs-IGO TFTs can be achieved by adjusting the doping *** has been demonstrated that GQDs-modified IGO TFTs devices with GQDs doping content of0.3 mg·ml^(-1)have the optimized performances,including field-effect mobility(μ_(FE))of 22.02 cm^(2)·V^(-1)·s^(-1),on/off current ratio(I_(on)/I_(off))of 7.06×10^(7),subthreshold swing(SS)of 0.09 V·dec^(-1),hysteresis of 0.04 V and interfacial trap states(D_(it))of 1.03×10^(12)cm^(-2).In addition,bias stress and illumination stress tests have been performed and excellent stability has been achieved for optimized *** GQDs-IGO TFTs device showed smaller threshold voltage shift of 0.12 and 0.04 V under positive bias stress(PBS)test and negative bias stress(NBS)test for 3600 s,*** it showed smaller threshold voltage shift of 0.27 and 0.34 V for red light under the PBS and NBS test for 3600 s,***,it showed smaller threshold voltage shift of0.20 and 0.22 V for green light under PBS and NBS test for3600 s,*** also showed smaller threshold voltage shift of 0.17 and 0.12 V for blue under the positive bias illumination stress(PBIS)test and negative bias illumination stress(NBIS)test for 3600 s,*** noise(LFN)characteristics of GQDs-IGO/ZrO_(x)TFTs indicated that the noise source came from the fluctuations in ***,a low voltage resistor-loaded unipolar inverter has been built based on GQDs-IGO/ZrO_(x)TFT,demonstrating good dynamic response behavior and a maximum gain of *** experimental results have suggested that solution-processed GQDs-IGO/ZrO_(x)TFT may envision potential applications in low-cost and large-area electronics.

关键词： Graphene quantum dots doped InGaO(GQDs-IGO) Thin-film transistors Stability Inverter Low-frequency noise

Diffusion-activated high performance ZnSnO/Yb_(2)O_(3) thin film transistors and application in low-voltage-operated logic circuits

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第11期70卷 49-58页

作者： Bing Yang gang he Wenhao Wang Yongchun Zhang Chong Zhang Yufeng Xia Xiaofen Xu School of Physics and Materials Science Radiation Detection Materials&Devices LabAnhui UniversityHefei 230601China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China School of Mechanical Engineering Anhui Vocational and Technical CollegeHefei 230011China

The flourishing metal-oxide high-k dielectric materials have been regarded as the vital components of low voltage operated flexible transparent electronic *** herein report that ytterbium oxide(Yb_(2)O_(3))and ZnSnO(ZTO)thin films were firstly integrated into ZTO-based thin film transistors(TFTs)with superior *** have indicated that the 500℃-annealed ZTO/Yb_(2)O_(3) TFTs possess the large saturation mobility of 9.1 cm^(2) V-1S^(-1) and the high on/off current ratio of 2.15×10^(7),which even surpass those of reported In-based *** deteriorative electrical properties in the aging process can be attributed to the carrier capture ***,the 460℃-processed TFTs demonstrate a tenfold increase in saturated mobility and an increase in on/off current ratio after 10 days *** inspiring electrical properties are attributed to the diffusion-activated carrier enhancement mechanism and electrons donor role of water molecular,which introduces a facile method to boost the device performance at lower processing *** neglected threshold voltage variations of 0.06 V and-0.2V have been detected after bias stability *** superior bias stability can be attributed to the charge delay effect induced by the continuous electric ***,the ultrahigh on/off current ratio of 1.1×10^(7) and the recoverable transferring performance have verified the aging-activated *** confirm its potential application in digital circuits,a resistor-loaded inverter with gain of 5.6 has been constructed and good dynamic response behavior have been detected at a low voltage of *** a result,it can be concluded that the high temperature annealing TFTs need immediate encapsulation,while the performance of the lower temperature processing samples can be optimized after aging treatment,indicating the potential prospect in low power consumption large-scale flexible transparent devices.

关键词： Ytterbium oxide(Yb_(2)O_(3)) Thin-film transistors(TFTs) Diffusion-activated Bias stability Inverter

Metal-to-insulator transition in platinum group compounds

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3460-3474页

作者： Yu-Xuan Xia Jian-gang he Nuo-Fu Chen Ji-Kun Chen School of New Energy North China Electric Power UniversityBeijing102206China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Materials and Devices for PostMoore Chips(Ministry of Education) School of Materials Science and EngineeringJniversity of Science and Technology BeijingBeijing 100083China

The metal-to-insulator transition(MIT) as usually achieved in 3d-orbital transitional metal(TM) compounds opens up a new paradigm in correlated electronics via triggering abrupt variations in their transportation *** to such 3d-orbital TM compounds,the MIT within the platinum group(Pg) element compounds based on the 4d-and 5d-orbital configurations is more complicated,owing to their elevation in the spinorbit coupling and meanwhile weakened intra-atomic Coulomb *** brings in a new freedom to regulate the balance in their metallic or semiconductive orbital configurations,while their MIT properties can be potentially combined with their spintronic properties to enable new electronic ***,we review the electronic transport and MIT behaviors within the existing family of Pg-containing compounds,particularly those showing first-order MIT behaviors that can be useful in correlated *** is also hoped that summarizing the presently reported Pg-containing MIT compounds will lead to the discovery of more new material families and/or new mechanisms associated with the Pg-containing compounds showing MIT properties.

关键词： Metal-to-insulator transition Platinum group compounds Electron correlation Spin-orbital coupling