检索结果-南通市图书馆

NEW NRD GUIDE OSCILLATOR

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

NEW NRD GUIDE OSCILLATOR

Corporate Credit Ratings Based on Hierarchical Heterogeneous Graph Neural Networks

International Conference on Millimeter Wave and Far-Infrared Technology

作者： Miao,jing-feng Yang,Ping Department of Radio Engineering Southeast University

＜正＞A new millimeter-wave Gunn oscillator is *** present structure makes use of NRD guide and metal resonant *** experimental results of 8mm and 6mm guide oscillators show that the new Gunn oscillator has a future a... 详细信息

关键词： Oscillators, Gunn

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Machine Intelligence Research 2024年第2期21卷 257-271页

作者： Bo-jing feng Xi Cheng Hao-Nan Xu Wen-Fang Xue Center for Research on Intelligent Perception and Computing National Laboratory of Pattern RecognitionInstitute of AutomationChinese Academy of SciencesBeijing 100190China

order to help investors understand the credit status of target corporations and reduce investment risks,the corporate credit rating model has become an important evaluation tool in the financial *** models are based on statistical learning,machine learning and deep learning especially graph neural networks(GNNs).However,we found that only few models take the hierarchy,heterogeneity or unlabeled data into account in the actual corporate credit rating ***,we propose a novel framework named hierarchical heterogeneous graph neural networks(HHGNN),which can fully model the hierarchy of corporate features and the heterogeneity of relationships between *** addition,we design an adversarial learning block to make full use of the rich unlabeled samples in the financial *** experiments conducted on the public-listed corporate rating dataset prove that HHGNN achieves SOTA compared to the baseline methods.

关键词： Corporate credit rating hierarchical relation heterogeneous graph neural networks adversarial learning

Controlling Roll Temperature by Fluid-Solid Coupled Heat Transfer

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 Mechanical Engineering 2018年第5期31卷 66-79页

作者： jing-feng Zou Li-feng Ma Guo-Hua Zhang Zhi-Quan Huang Jin-Bao Lin Peng-Tao Liu Heavy Machinery Engineering Research Center of the Ministry Education Taiyuan University of Science and Technology Taiyuan 030024 China School of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024 China

Currently, when magnesium alloy sheet is rolled, the method of controlling roll temperature is simple and inaccurate. Furthermore, roll temperature has a large influence on the quality of magnesium alloy sheet; therefore, a new model using circular fluid flow control roll temperature has been designed. A fluid heat transfer structure was designed, the heat transfer process model of the fluid heating roll was simplified, and the finite di erence method was used to cal?culate the heat transfer process. Fluent software was used to simulate the fluid?solid coupling heat transfer, and both the trend and regularity of the temperature field in the heat transfer process were identified. The results show that the heating e ciency was much higher than traditional heating methods(when the fluid heat of the roll and tempera?ture distribution of the roll surface was more uniform). Moreover, there was a bigger temperature di erence between the input and the output, and after using reverse flow the temperature di erence decreased. The axial and circum?ferential temperature distributions along the sheet were uniform. Both theoretical calculation results and numerical simulation results of the heat transfer between fluid and roll were compared. The error was 1.8%–12.3%, showing that the theoretical model can both forecast and regulate the temperature of the roll(for magnesium alloy sheets) in the rolling process.

关键词： Magnesium alloy Fluid heating Heat transfer model Numerical simulation of fluid?solid coupling

AquaSee: Predict Load and Cooling System Faults of Supercomputers Using Chilled Water Data

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2020年第1期35卷 221-230页

作者： Yu-Qi Li Li-Quan Xiao jing-Hua feng Bin Xu Jian Zhang National Supercomputer Center in Tianjin Tianjin 300450China College of Computer National University of Defense TechnologyChangsha 410073China

An analysis of real-world operational data of Tianhe-1A(TH-1A)supercomputer system shows that chilled water data not only can reflect the status of a chiller system but also are related to supercomputer *** study proposes AquaSee,a method that can predict the load and cooling system faults of supercomputers by using chilled water pressure and temperature *** method is validated on the basis of real-world operational data of the TH-1A supercomputer system at the National Supercomputer Center in *** with various compositions are used to construct the prediction model,which is also established using different prediction sequence *** results show that the method that uses a combination of pressure and temperature data performs more effectively than that only consisting of either pressure or temperature *** best inference sequence length is two ***,an anomaly monitoring system is set up by using chilled water data to help engineers detect chiller system anomalies.

关键词： supercomputer chilled water data sensor network load prediction

Effect of rare earth on primary carbides in H13 die steel and their addition method:a review

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 Iron and Steel Research International 2024年第3期31卷 531-551页

作者： jing-feng Wang Lin-zhu Wang Chao-yi Chen Xiang Wang Fei Zhao School of Materials and Metallurgy Guizhou UniversityGuiyang 550025GuizhouChina Zhengzhou Railway Vocational and Technical College Zhengzhou 450000HenanChina Guizhou Provincial University Key Laboratory of High Performance Battery Materials Guizhou UniversityGuiyang 550025GuizhouChina Shougang Guiyang Special Steel Co. Guiyang 550005GuizhouChina

Larger-sized primary carbides lead to stress concentration during the application of H13 hot-work die steel,resulting in microcracks and fatigue *** earth was usually added to modify the carbides and *** existing literature is reviewed on the effect of rare earth on primary carbides in H13 steel.A comprehensive review on the effect of rare earth on the characteristics of primary carbides,i.e.,number,size,morphology,and thermal stability in H13 steel,was *** precipitation mechanism and nucleation of primary carbides with rare earth were *** position and form of rare earth in steel and their effects on alloying elements segregation were *** addition techniques of rare earth in H13 steel were compared,and the prospects for other uncommon rare earth and emerging technology were *** on the current references,it can be known that adding rare earth facilitated refined and dispersed primary *** size of primary carbides would be reduced,and their morphology would be improved because the rare earth inclusions formed in H13 steel can act as nucleation cores forγ-Fe orδ-Fe,refining the dendritic ***,the number of primary carbides at grain boundaries would be significantly ***,rare earth had little impact on thermal *** nucleation of primary carbides tended to be inhibited due to the modification of inclusions by rare earth which were likely to be nucleation cores for primary *** earth had been reported to affect the mechanism and process of primary carbide ***,the addition of rare earth can inhibit the segregation of alloying elements and carbon diffusion by ***,laboratory experiments and theoretical calcu-lations need to be conducted to study the states and evolution of rare earth steels.

关键词： Rare earth H13 die steel Primary carbide Nucleation Dendritic structure

NMR Studies on the Subacute Biochemical Effects of Aristolochic Acid on Rat Serum

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 Chemical Letters 2005年第11期16卷 1507-1510页

作者： XiaoYu ZHANG Hui feng WU Xiao jing LI feng Kui PEI Jia Zuan NI Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022

The subacute effect of aristolochic acid （AA） on rat serum was studied by NMR method. The biochemical effects induced by AA were characterized by an increase in the amounts of creatinine, trimethylamine N-oxide, acetoacetate, acetate and 3-D-hydroxybutyrate and lactate in serum from ^1H NMR spectra. Principal component analysis was used for further comparing the similarities of ^1H NMR spectral profiles of serum from rats treated with AA and model toxins.

关键词： Aristolochic acid NMR serum principal component analysis metabolite.

Ferroelectric domains and phase transition of sol-gel processed epitaxial Sm-doped BiFeO_(3)(001)thin films

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2018年第1期4卷 27-34页

作者： Zhen Zhou Wei Sun Zhenyu Liao Shuai Ning jing Zhu jing-feng Li State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China National Center for Electron Microscopy in Beijing State Key Laboratory of New Ceramics and Fine ProcessingKey Laboratory of Advanced Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

BiFeO_(3),a room-temperature multiferroic material,has recently been increasingly applied as a potential lead-free piezoelectric material due to its large piezoelectricity achieved by *** this work,12%Smdoped BiFeO_(3)epitaxial thin films were fabricated on Nb-doped SrTiO_(3)(001)single crystal substrates via sol-gel *** epitaxy was verified by reciprocal space mapping(RSM)and transmission electron microscope(TEM).The TEM results indicated the coexistence of R3c and Pbam phases in the *** domains and piezoelectric properties from room temperature to 200℃were characterized by piezoresponse force microscopy(PFM).Domains became active from 110℃to 170℃,and domain configurations changed obviously.A partially fading piezoresponse indicated the emergence of antiferroelectric *** in-situ domain analysis suggested that the phase transition was accompanied by domain wall *** spectroscopy PFM(SS-PFM)was further conducted to investigate the piezoresponse during the phase *** responses were found in both ON and OFF states at 170℃,and the film exhibits typical antiferroelectric behavior at 200℃,implying that the completion of phase transition and structure turned to the Pbam *** work revealed the origin of the high piezoresponse of Sm-doped BiFeO_(3)thin films at the morphotropic phase boundary(MPB).

关键词： BiFeO_(3) Piezoresponse force microscopy Morphotropic phase boundary Phase transition Antiferroelectric

Conjugation of Chitooligosaccharide-5-fluorouracil with Bovine Serum Albumin

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 Chemical Letters 2006年第11期17卷 1495-1498页

作者： Rong Min WANG jing feng SONG Yu feng HE Juan Juan MAO Yan LI Key Laboratory of Polymer Materials of Gansu Province Institute of Polymer Northwest Normal University Lanzhou 730070

The interaction between chitooligosaccharide-5-fluorouracil （COS-5FU） and bovine serum albumin （BSA） was studied by fluorescence spectroscopy. It was found that an energy transfer between COS-5FU and BSA had been occurred. The binding constants were calculated, k298K=1.175×10^4 L·mol^-1. Based on the mechanism of energy transfer of dipole-dipole interaction between the donor and acceptor, the distance between BSA and COS-SFU was determined.

关键词： Chitooligosaccharide-5-fluorouracil BSA fluorescence spectroscopy.

First Principles Study on the Stability and Mechanical Properties of MB (M=V, Nb and Ta) Compounds

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第11期30卷 144-148页

作者： QI Chen-Jin feng jing ZHOU Rong-feng JIANG Ye-Hua ZHOU Rong Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093 School of Engineering and Applied Science Harvard UniversityCambridgeMA 02138USA

The first principles calculations based on density functional theory are performed to investigate the stability,chemical bonding,elastic constants,hardness and Debye temperature of MB(M=V,Nb and Ta)*** structures of these borides are optimized,and the lattice parameters are in good agreement with the experimental *** calculated cohesive energy and formation enthalpy indicate that they are of a thermodynamically stable *** mechanical properties,including elastic constants Cij,bulk modulus,Young's modulus,shear modulus and Poisson's ratio,are *** bulk moduli of them ranging from 263.0 to 278.4 GPa are larger than many common Laves phases and TaB with 278.4 GPa being the largest bulk modulus value among *** population analysis is used to analyze the chemical bonds in these *** hardness of the compounds is also evaluated,and the result reveals that TaB is the hardest compound among *** Debye temperature of MB is *** results show that the values of MB compounds range from 419.3 to 794.3 K.

关键词： compounds structure modulus