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Annual Energy Production Estimation for Variable-speed Wind Turbine at High-altitude Site

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 684-687页

作者： Dongran Song Songyue Zheng sheng yang Jian yang Mi Dong Mei Su Young Hoon Joo the School of Automation Central South UniversityChangsha 410083China the School of Energy Science and Engineering Central South UniversityChangsha 410083China the School of IT Information and Control Engineering Kunsan National UniversityKunsan 573701Korea

This letter presents a systematic approach to estimate the annual energy production(AEP) of variable-speed wind turbines erected at high-altitude sites. Compared with the existing empirical-model based approaches, the proposed approach models the influence of the air density on the power production while employing the theoretical power curve. Consequently, the proposed approach provides a precise estimation of AEP, which can serve as a foundation of the optimum turbinesite matching design at different-altitude sites.

关键词： Variable-speed wind turbine annual energy production high-altitude site turbine-site matching

Binomial lattice for pricing Asian options on yields

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Journal of Central South University of Technology 2003年第1期10卷 78-80页

作者： yang De-sheng(杨德生) Department of Applied Mathematics Tongji University Shanghai 200092 China College of Mathematical Science and Computational Technology Central South University Changsha 410083 China

An efficient binomial lattice for pricing Asian options on yields is established under the affine term structure model. In order to reconnect the path of the discrete lattice,the technique of D. Nelson and K. Ramaswamy is used to transform a stochastic interest rate process into a stochastic diffusion with unit volatility. By the binomial lattice and linear interpolation,the prices of Asian options on yields can be obtained. As the number of nodes in the tree structure grows linearly with the number of time steps, the computational speed is improved. The numerical experiments to verify the validity of the lattice are also provided.

关键词： Asian option binomial lattice affine term structure

Effect of Polyacrylamide Application on Runoff,Erosion,and Soil Nutrient Loss Under Simulated Rainfall

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Pedosphere 2011年第5期21卷 628-638页

作者： WANG Ai-Ping LI Fa-Hu yang sheng-Min Inner Mongolia Coal Mine Design and Research Institute No. 55 Xinhua Road Hohhot 010010 (China) College of Water Conservancy and Civil Engineering China Agricultural University No. 17 Qinghua East Avenue Haidian District Beijing 100083 (China) State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau No. 26 Xinong Road Yangling 712100 (China) Beijing Vocational College of Agriculture No. 5 Daotiannanli Changyang Town Beijing 102442(China)

Soil erosion affects soil productivity and environmental quality.A laboratory research experiment under simulated heavy rainfall with tap water was conducted to investigate the effects of anionic polyacrylamide(PAM) application rates(0,0.5,1.0,and 2.0 g m-2) and molecular weights(12 and 18 Mg mol-1) on runoff,soil erosion,and soil nutrient loss at a slope of 5°.The results showed the two lower rates of PAM application decreased runoff while the highest rate increased runoff as compared with the *** concentration and soil mass loss increased significantly with the increasing PAM application *** with the control,PAM application decreased K+,NH4+,and NO3-concentrations in sediment and K+ and NH+4 concentrations in runoff,but significantly increased the mass losses of K+,NH4+,and NO-3 over soil surface except for the NH4+ at PAM application rate lower than 1.0 g *** application decreased the proportion of K+ loss with runoff to its total mass loss over soil surface from 60.1% to 16.4%.However,it did not affect the NH4+ and NO3-losses with runoff,and more than 86% of them were lost with runoff.A higher PAM molecular weight resulted in less soil erosion and K+ mass loss but had little effect on runoff and NH+4 and *** application did not prevent soil erosion and the mass losses of K+ and NO3-under experimental conditions.

关键词： application rate mass loss molecular weight nutrient concentration sediment concentration

Molecular Dynamics Simulation Studies on the Cooling Process of Polyvinyl Chloride

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Chemical Research in Chinese Universities 2006年第1期22卷 80-84页

作者： yang Hua LI Ze-sheng yang Yong-biao ZHANG Xiu-bin SUN Chia-chung State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Changchun 130023 P. R. China

By means of molecular dynamics simulation, the transition of the conformations of polyvinyl chloride during a cooling process from 600 to 300 K was studied. The results show that the amorphous polyvinyl chloride chain experiences the melting state, elastic state and glass state and the conformations can be characterized by the increases of the trans-state of C--C--C--C and the near gauche-state of C--C--C--C1 with the decrease of temperature. It is found that the transition of the conformations is driven mainly by the Coulomb interaction between chain segments.

关键词： Molecular dynamics simulation Polyvinyl chloride Cooling Conformation

Organoids revealed:morphological analysis of the profound next generation in-vitro model with artificial intelligence

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Bio-Design and Manufacturing 2023年第3期6卷 319-339页

作者： Xuan Du Zaozao Chen Qiwei Li sheng yang Lincao Jiang Yi yang Yanhui Li Zhongze Gu State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210008China Key Laboratory of Environmental Medicine Engineering Ministry of EducationSchool of Public HealthSoutheast UniversityNanjing 210009China

In modern terminology,“organoids”refer to cells that grow in a specific three-dimensional(3D)environment in vitro,sharing similar structures with their source organs or *** themorphology or growth characteristics of organoids through a microscope is a commonly used method of organoid ***,it is difficult,time-consuming,and inaccurate to screen and analyze organoids only manually,a problem which cannot be easily solved with traditional *** intelligence(AI)technology has proven to be effective in many biological and medical research fields,especially in the analysis of single-cell or hematoxylin/eosin stained tissue *** used to analyze organoids,AI should also provide more efficient,quantitative,accurate,and fast *** this review,we will first briefly outline the application areas of organoids and then discuss the shortcomings of traditional organoid measurement and analysis ***,we will summarize the development from machine learning to deep learning and the advantages of the latter,and then describe how to utilize a convolutional neural network to solve the challenges in organoid observation and ***,we will discuss the limitations of current AI used in organoid research,as well as opportunities and future research directions.

关键词： Artificial intelligence Organoids Morphology Growth characteristics Deep learning Convolutional neural network

Towards designing high mechanical performance low-alloyed wrought magnesium alloys via grain boundary segregation strategy:A review

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Journal of Magnesium and Alloys 2024年第5期12卷 1774-1791页

作者： Zhi Zhang Jinshu Xie Jinghuai Zhang Xu-sheng yang Ruizhi Wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Ultra-Precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518060China

Low-alloyed magnesium(Mg)alloys have emerged as one of the most promising candidates for lightweight ***,their further application potential has been hampered by limitations such as low strength,poor plasticity at room temperature,and unsatisfactory *** address these challenges,grain refinement and grain structure control have been identified as crucial factors to achieving high performance in low-alloyed Mg *** effective way for regulating grain structure is through grain boundary(GB)*** review presents a comprehensive summary of the distribution criteria of segregated atoms and the effects of solute segregation on grain size and growth in Mg *** analysis encompasses both single element segregation and multi-element co-segregation behavior,considering coherent interfaces and incoherent ***,we introduce the high mechanical performance low-alloyed wrought Mg alloys that utilize GB segregation and analyze the potential impact mechanisms through which GB segregation influences materials *** upon these studies,we propose strategies for the design of high mechanical performance Mg alloys with desirable properties,including high strength,excellent ductility,and good formability,achieved through the implementation of GB *** findings of this review contribute to advancing the understanding of grain boundary engineering in Mg alloys and provide valuable insights for future alloy design and optimization.

关键词： Magnesium alloys Grain boundary segregation High strength High plasticity High formability

A frequency and amplitude dependent model of rail pads for the dynamic analysis of train-track interaction

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Science China(Technological Sciences) 2015年第2期58卷 191-201页

作者： ZHU sheng yang CAI Cheng Biao LUO Zhen LIAO Zhong Qi State Key Laboratory of Traction Power Southwest Jiaotong University China Railway Construction Heavy Industry Co. Ltd. China Railway Longchang Materials Co. Ltd.

A frequency and amplitude dependent model is used to describe the complex behavior of rail pads. It is implemented into the dynamic analysis of three dimensional coupled vehicle-slab track （3D-CVST） systems. The vehicle is treated as a 35-degree- of-freedom multi-body system, and the slab track is represented by two continuous Bernoulli-Euler beams supported by a se- ries of elastic rectangle plates on a viscoelastic foundation. The rail pad model takes into account the influences of the excita- tion frequency and of the displacement amplitude through a fractional derivative element, and a nonlinear friction element, re- spectively. The Granwald representation of the fractional derivatives is employed to numerically solve the fractional and non- linear equations of motion of the 3D-CVST system by means of an explicit integration algorithm. A dynamic analysis of the 3D-CVST system exposed to excitations of rail harmonic irregularities is primarily carried out, which reveals the dependence of stiffness and damping on excitation frequency and displacement amplitude. Subsequently, sensitive analyses of the model parameters are investigated by conducting the dynamic analysis of the 3D-CVST system subjected to excitations of welded rail joint irregularities. Following this, parameters of the rail pad model are optimized with respect to experimental values. For elu- cidation, the 3D-CVST dynamic model incorporated with the rail pads model is used to calculate the wheel/rail forces induced by excitations of measured random track irregularities. Further, the numerical results are compared with experimental data, demonstrating the reliability of the proposed model.

关键词： rail pads vehicle-track coupled dynamics frequency dependent amplitude dependent

A New Furost-20(22)-ene Oligoglycoside from Asparagus cochinchinensis

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Chinese Chemical Letters 2003年第7期14卷 717-719页

作者： Yong Chun yang sheng yang HUANG Shun Yan MO Chun yang Jian Gong SHI Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050

A new furost-20(22)-ene oligoglycoside named as aspacochioside C was isolated from the roots of Asparagus cochinchinensis (Lour.) Merr.. Its structure was elucidated to be 26-O-b- D-glucopyranosyl-(25S)-5b-furost-20(22)-en-3b,26-diol-3-O-a-L-rhamnopyranosyl-(14)-b-D- glucopyranoside on the basis of spectroscopic techniques including 1D and 2D NMR experiments.

关键词： Asparagus cochinchinensis (Lour.) Merr Liliaceae, furost-20(22)-ene oligoglycoside aspacochioside C.

Hollow glass microspheres/silicone rubber composite materials toward materials for high performance deep in-situ temperaturepreserved coring

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Petroleum Science 2022年第1期19卷 309-320页

作者： Jian-Ping yang Ling Chen Xiao-Bin Gu Zhi-Yu Zhao Cheng-Hang Fu Dong-sheng yang Dong-Zhuang Tian Zhi-sheng Chen He-Ping Xie College of Polymer Science and Engineering Sichuan UniversityChengdu610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060China School of Mechanical Engineering Sichuan UniversityChengdu610065China Jinshi Drilltech Company Limited Tangshan063004Hebei Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu610065China College of Water Resource&Hydropower Sichuan UniversityChengdu610065China Xi'an Research Institute China Coal Technology&Engineering Group CorpXi'an710077China

Deep petroleum resources are stored under high temperature and pressure conditions,with the temperature having a significant influence on the properties of *** in-situ temperature-preserved coring(ITP-coring)devices were developed to assess deep petroleum reserves ***,hollow glass microspheres(HGMs)/silicone rubber(SR)composites that exhibit excellent thermal insulation properties were prepared as thermal insulation materials for deep ITP-coring *** mechanism and process of heat transfer in the composites were explored,as well as their other *** results show that the HGMs exhibit good compatibility with the SR *** the volume fraction of the HGMs is increased to 50%,the density of the HGMs/SR composites is reduced from 0.97 to 0.56 g/cm^(3).The HGMs filler introduces large voids into the composites,reducing their thermal conductivity to 0.11 W/m·*** addition of HGMs into the composites further enhances the thermal stability of the SR,wherein the higher the HGMs filler content,the better the thermal stability of the *** significantly enhance the mechanical strength of the *** increase the compressive strength of the composites by 828%and the tensile strength by 164%.Overall,HGMs improve the thermal insulation,pressure resistance,and thermal stability of HGMs/SR composites.

关键词： In-situ temperature-preserved coring(ITP-coring) Deep in-situ conditions Thermal insulation materials HGMs/SR composites