检索结果-南通市图书馆

Structure and Aromaticity of AlCO-substituted Semibullvalene

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第8期26卷 897-901页

作者： yao wen-Zhi WU Hai-Shun Chemistry and Material Science Institute Shanxi Normal University Linfen 041004 China

The structures, energies and aromaticity （the nuclear-independent chemical shifts,NICS） of AlCO-substituted semibullvalenes were investigated at the B3LYP/6-311＋G＊＊ *** to BCO-substituted analogues, [2,6]-AlCO-semibullvalene is neutral *** NICS values reveal that the aromaticity of AlCO-substituted structures is smaller than that of BCO analogues.

关键词： DFT semibullvalene AlCO aromaticity

Rapid Hypoeutectic Growth Within a Highly Undercooled Liquid Under containerless Condition

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2002年第4期19卷 584-587页

作者： Han Xiu-Jun, yao wen-Jing Department of Applied Physics Northwestern Polytechnical University

Rapid hypoeutectic growth from a highly undercooled liquid was accomplished by containerless processing Ni-32%Sb hypoeutectic alloy in a 3m drop tube. The containerless state during the free fall of the droplet produces substantial undercooling up to 350K (0.24TL). The growth mechanism is found to transform from primary α-Ni dendrite plus lamellar eutectic to lamellar eutectic and finally to anomalous eutectic if droplet undercooling exceeds the two thresholds of 112K and 242K, respectively. Based on the current eutectic and dendritic growth models, the eutectic coupled zone is calculated and used to explain the growth mechanism transition. Calculations also indicate that the growth of α-Ni primary dendrite was mainly controlled by solute diffusion.

关键词： growth(materials) Dendrites dendrites hypoeutectic growth solute diffusion free fall hypoeutectic alloy Undercooling EUTECTIC Growth anomalous eutectic

Parameter identifications for a rotor system based on its finite element model and with varying speeds

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

Acta Mechanica Sinica 2010年第2期26卷 299-303页

作者： Qingkai Han Hongliang yao Bangchun wen School of Mechanical Engineering and Automation Northeastern University 110004 Shenyang China

In order to achieve prediction for vibration of rotating machinery, an accurate finite element （FE） model and an efficient parameter identification method of the rotor system are required. In this research, a test rig is used as a prototype of a rotor system to validate a novel parameter identification technique based on an FE model. Rotor shaft vibration at varying operating speeds is measured and correlated with the FE results. Firstly, the theories of the FE modelling and identification technique are introduced. Then disk unbalance parameter, stiffness and damping coefficients of the bearing supports on the test rig are identified. The calculated responses of the FE model with identified parameters are studied in comparison with the experimental results.

关键词： Rotor system · Finite element model ·Parameter identification· Model validation

Quantum K-theory and q-difference Equations

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第10期38卷 1677-1704页

作者： Yong Bin RUAN yao Xiong wen Institute of Advanced Study for Mathematics Zhejiang UniversityHangzhou 310058P.R.China Korea Institute for Advanced Study 85 HoegiroDongdaemun-guSeoul02455Republic of Korea

This is a set of lecture notes for the first author’s lectures on the difference equations in2019 at the Institute of Advanced Study for Mathematics at Zhejiang *** focus on explicit computations and *** convergence ... 详细信息

关键词： Quantum K-theory q-difference equation

Acyclic Edge Coloring of Triangle-free 1-planar Graphs

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2015年第10期31卷 1563-1570页

作者： wen yao SONG Lian Ying MIAO Institute of Mathematics China University of Mining and TechnologyXuzhou

A proper edge coloring of a graph G is acyclic if there is no 2-colored cycle in G. The acyclic chromatic index of G, denoted by X＇a（G）, is the least number of colors such that G has an acyclic edge coloring. A graph is 1-planar if it can be drawn on the plane so that each edge is crossed by at most one other edge. In this paper, it is proved that X＇a（G） ≤△ A（G）＋ 22, if G is a triangle-free 1-planar graph.

关键词： Acyclic chromatic index acyclic edge coloring 1-planar graph

Adaptive ant-based routing in wireless sensor networks using Energy~* Delay metrics

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 531-538页

作者： yao-feng wen Yu-quan CHEN Min PAN State Specialized Laboratory of Biomedical Sensors Zhejiang University Hangzhou 310027 China

To find the optimal routing is always an important topic in wireless sensor networks (WSNs). Considering a WSN where the nodes have limited energy, we propose a novel Energy*Delay model based on ant algorithms ("E&D ANTS" for short) to minimize the time delay in transferring a fixed number of data packets in an energy-constrained manner in one round. Our goal is not only to maximize the lifetime of the network but also to provide real-time data transmission services. However, because of the tradeoff of energy and delay in wireless network systems, the reinforcement learning (RL) algorithm is introduced to train the model. In this survey, the paradigm of E&D ANTS is explicated and compared to other ant-based routing algorithms like AntNet and AntChain about the issues of routing information, routing overhead and adaptation. Simulation results show that our method performs about seven times better than AntNet and also outperforms AntChain by more than 150% in terms of energy cost and delay per round.

关键词： Ant colony optimization (ACO) Pheromones Power consumption Wireless sensor networks (WSNs)

Reducing porcine corneal graft rejection, with an emphasis on porcine endogenous retrovirus transmission safety: a review

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2019年第2期12卷 324-332页

作者： yao-wen Song Zhi-Qiang Pan Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Ophthalmology and Visual Science Key Laboratory

Donor cornea shortage is a primary hurdle in the development of corneal transplantation. Of all species, porcine corneas are the ideal transplantation material for humans. However, the xenoimmune rejection induced by porcine corneal xenotransplantation compromises surgical efficacy. Although the binding of IgM/IgG in human serum to a genetically modified porcine cornea is significantly weaker than that of the wild type(WT), genetically modified porcine corneas do not display a prolonged graft survival time in vivo. Conversely, costimulatory blockade drugs, such as anti-CD40 antibodies, can reduce the xenoimmune response and prolong graft survival time in animal experiments. Moreover, porcine endothelial grafts can survive for more than 6mo with only the subconjunctival injection of a steroid-based immunosuppressants regime; therefore, they show great value for treating corneal endothelial disease. In addition, zoonotic transmission is a primary concern of xenotransplantation. Porcine endogenous retrovirus(PERV) is the most significant virus assessed by ophthalmologists. PERV integrates into the porcine genome and infects human cells in vitro. Fortunately, no evidence from in vivo studies has yet shown that PERV can be transmitted to hosts.

关键词： corneal xenotransplantation genetically modified pigs wild type pigs costimulatory blockade drugs porcine endothelial grafts porcine endogenous retrovirus safety

Morphological and molecular response of small intestine to lactulose and hydrogen-rich water in female piglets fed Fusarium mycotoxins contaminated diet

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

Journal of Animal Science and Biotechnology 2019年第3期10卷 694-707页

作者： Xu Ji Qing Zhang Weijiang Zheng wen yao Laboratory of Gastrointestinal Microbiology Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal HealthCollege of Animal Science and TechnologyNanjing Agricultural UniversityNanjing 210095JiangsuChina Key Lab of Animal Physiology and Biochemistry Ministry of AgricultureNanjing 210095JiangsuChina

Background: Following the intake of Fusarium mycotoxin-contaminated feed,small intestines may be exposed to high levels of toxic substances that can potentially damage intestinal functions in *** is well known that Fusarium mycotoxins will lead a breakdown of the normally impeccable epithelial barrier,resulting in the development of a "leaky" gut.H2 administration with different methods has been proved definitely potentials to prevent serious intestinal *** goal of this study is to investigate the roles of lactulose(LAC) and hydrogenrich water(HRW) in preventing intestinal dysfunction in piglets fed Fusarium mycotoxin-contaminated ***: A total of 24 female piglets were evenly assigned to 4 groups: negative control(NC) group,mycotoxincontaminated(MC) feed group,MC feed with LAC treatment(MC + LAC),and MC feed with HRW treatment(MC +HRW),*** in the NC group were fed uncontaminated control diet,while remaining piglets were fed Fusarium mycotoxin-contaminated *** the NC and MC groups,10 mL/kg body weight(BW) of hydrogen-free water(HFW) was orally administrated to piglets twice daily;while in the MC + LAC and MC + HRW groups,piglets were treated with the same dose of LAC solution(500 mg/kg BW) and HRW twice daily,*** d 25,serum was collected and used for biochemical *** tissues were sampled for morphological examination as well as relative genes and protein expression ***: Our data showed that Fusarium mycotoxins induced higher serum diamine oxidase(DAO) activities(P < 0.05),D-lactic acid levels(P < 0.01),and endotoxin status(P < 0.01),lower villus height(P < 0.01) and ratio of villus height to crypt depth(P < 0.05) in small intestine,greater apoptosis index and higher mRNA expression related to tight junctions(P < 0.05).In addition,the distribution and down-regulation of claudin-3(CLDN3) protein in the small intestinal was also *** expected,oral administrations of HRW and L

关键词： Fusarium mycotoxins Hydrogen-rich water Lactulose Piglets Small intestine

A machine learning surrogate modeling benchmark for temperature field reconstruction of heat source systems

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2023年第5期66卷 162-181页

作者： Xiaoqian CHEN Zhiqiang GONG Xiaoyu ZHAO Weien ZHOU wen yao Defense Innovation Institute Chinese Academy of Military Science

The temperature field reconstruction of heat source systems(TFR-HSS) with limited monitoring sensors in thermal management plays an important role in the real-time health detection systems of electronic equipment in engineering. However, prior methods with common interpolations usually cannot provide accurate reconstruction performance as required. In addition, no public dataset exists for the wide research of reconstruction methods to further boost reconstruction performance and engineering applications. To overcome this problem, this work develops a machine learning surrogate modeling benchmark for the TFRHSS task. First, the TFR-HSS task is mathematically modeled from a real-world engineering problem, and four types of computational modelings are constructed to transform the problem into discrete mapping ***, this work proposes a set of machine learning surrogate modeling methods, including general machine learning methods and deep learning methods, to advance the state-of-the-art methods over temperature field reconstruction. More importantly, this work develops a novel benchmark dataset, namely the temperature field reconstruction dataset(TFRD), to evaluate these machine learning surrogate modeling methods for the TFR-HSS task. Finally, a performance analysis of typical methods is given on the TFRD, which can serve as the baseline results on this benchmark.

关键词： temperature field reconstruction heat-source systems computational modeling temperature field reconstruction dataset machine learning surrogate modeling deep learning