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Dense packing properties of mineral admixtures in cementitious material

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Particuology 2009年第5期7卷 399-402页

作者： yanzhou Peng Shuguang Hu Qingjun Ding College of Civil&Hydroelectric Engineering China Three Gorges UniversityYichang 443002China Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education Wuhan University of TechnologyWuhan 430070China

The effect of ultra-fine fly ash （UFFA）, steel slag （SS） and silica fume （SF） on packing density of binary, ternary and quaternary cementitious materials was studied in this paper in terms of minimum water requirement of cement. The influence of mineral admixtures on the relative density of pastes with low water/hinder ratios was analyzed and the relationship between paste density and compressive strength of the corresponding hardened mortars was discussed. The results indicate that the incorporation of mineral admixtures can effectively improve the packing density ofcementitious materials; the increase in packing density of a composite with incorporation of two or three kinds of mineral admixtures is even more obvious than that with only one mineral admixture. Moreover, an optimal amount of mineral admixture imparts to the mixture maximum packing density. The dense packing effect of a mineral admixture can increase the packing density of the resulting cementitious material and also the density of paste with low water/binder ratio, which evidently enhances the compressive strength of the hardened mortar.

关键词： Mineral admixture Dense packing effect Minimum water requirement Packing density Relative density of paste Compressive strength

Development and Verification of the Equilibrium Strategy for Batteries in Electric Vehicles

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Journal of Beijing Institute of Technology 2018年第1期27卷 22-28页

作者： Rui Xiong yanzhou Duan National Engineering Laboratory for Electric Vehicles School of Mechanical EngineeringBeijing Institute of Technology

The inconsistency of the cells in a battery pack can affect its lifespan,safety and reliability in the electric vehicles. The balanced system is an effective technique to reduce its inconsistency and improve the operating performance. A hybrid equilibrium strategy based on decision combing battery state-of-charge（ SOC） and voltage has been proposed. The battery SOC is estimated through an improved least squares method. An equalization hardware in loop（ HIL） platform has been constructed. Based on this HIL platform,equilibrium strategy has been verified under the constant-current-constant-voltage（ CCCV） and dynamicstresstest（ DST） conditions. Experimental results indicate that the proposed hybrid equalization strategy can achieve good balance effect and avoid the overcharge and over-discharge of the battery pack at the same time.

关键词： electric vehicles battery pack state estimation hardware in loop equalization strategy

Structure Prediction of Membrane Proteins

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Genomics, Proteomics & Bioinformatics 2004年第1期2卷 1-5页

作者： ChunlongZhou YaoZheng yanzhou HangzhouGenomicsInstitute／JamesD.WatsonInstituteofGenomeSciences ZhejiangUniversity／KeyLaboratoryofBioinformaticsofZhejiangProvinceHangzhou310008China CenterforEngineeringandScientificComputation ZhejiangUniversityHangzhou310027China

There is a large gap between the number of membrane protein (MP) sequencesand that of their decoded 3D structures, especially high-resolution structures, due to difficultiesin crystal preparation of MPs. However, detailed knowledge of the 3D structure is required for thefundamental understanding of the function of an MP and the interactions between the protein and itsinhibitors or activators. In this paper, some computational approaches that have been used topredict MP structures are discussed and compared.

关键词： structure prediction membrane proteins

A case study of the consistency problem in the inverse estimation

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Acta Oceanologica Sinica 2017年第9期36卷 45-51页

作者： WEI yanzhou KANG Xianbiao PEI Yuhua State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China College of Air Traffic Management Civil Aviation Flight University of China Guanghan 618307 China

Inverse technique is a widely used method in oceanography, but it has a problem that the retrieved solutions often violate model prior assumptions. To tune the model has consistent solutions, an iteration approach, which successively utilizes the posterior statistics for next round inverse estimation, is introduced and tested from a real case study. It is found that the consistency may become elusive as the determinants of solution and noise covariance matrices become zero in the iteration process. However, after several steps of such operation, the difference between posterior statistics and the model prior ones can be gradually reduced.

关键词： regularization consistency inverse problems box inverse model L-curve method

Seasonal variability of the Kuroshio Current at the PN Section in the East China Sea based on in-situ observation from 1987 to 2010

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Acta Oceanologica Sinica 2015年第5期34卷 12-21页

作者： WEI yanzhou PEI Yuhua ZHANG Rong-Hua Key Laboratory of Ocean Circulation and Wave Institute of OceanologyChinese Academy of Sciences University of the Chinese Academy of Sciences State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration College of Physical and Environmental Oceanography Ocean University of China

As the spatio-temporal variability of the Kuroshio is highly influenced by mesoscale eddies, representing its seasonal variability characteristics requires sufficiently long term observations to reduce the uncertainties. Geostrophic velocity data estimated from hydrographic observation from 1987 to 2010 and the shipboard ADCP velocity data from 1993 to 2008 at the PN Section in the central East China Sea are collected to view the seasonal variability objectively. From both types of observation, it is found that the seasonal climatology mean of the Kuroshio Current exhibits significant difference in three areas, which are located at the Kuroshio Current core and its two flanks in a shallow layer less than 300 m, with the weakest northeast current at the core in autumn, the strongest counter current on the right flank in spring, and the strongest northeast current on the left flank in autumn, respectively. The seasonal variance of the Kuroshio Current also exhibits significant difference on the off- shore side of the Kuroshio, with larger variance in spring and summer while smaller variance in autumn and winter. For the current parallel to the PN Section, the ratio of the seasonal variability component to the intraseasonal variability component is relatively smaller than that for the current perpendicular to the PN Section. Further analyses indicate that the seasonal variability at the PN Section is tightly linked to the upstream and downstream current variability.

关键词： Kuroshio Current seasonal variability East China Sea significance test

A new species of Dinocarsiella(Hymenoptera:Encyrtidae)from China

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Zoological Systematics 2021年第3期46卷 269-271页

作者： Yaru Zhang yanzhou Zhang Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100080China College of Life Sciences Hebei UniversityBaodingHebei ProvinceChina

Dinocarsiella brevicula *** described from Tibet,*** are provided to illustrate morphological characters of the *** specimens including the holotype were deposited in Institute of Zoology,Chinese Academy of Sciences,B... 详细信息

关键词： Hymenoptera Encyrtidae Dinocarsiella new species China

Design and Implementation of a Battery Big Data Platform Through Intelligent Connected Electric Vehicles

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 291-301页

作者： Rui Xiong Baoqiang Zhu Kui Zhang yanzhou Duan Fengchun Sun National Engineering Research Center for Electric Vehicles School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China

The development of a battery management algorithm is highly dependent on high-quality battery operation data,especially the data in extreme conditions such as low *** data in faults are also essential for failure and safety management *** study developed a battery big data platform to realize vehicle operation,energy interaction and data ***,we developed an electric vehicle with vehicle navigation and position detection and designed an environmental cabin that allows the vehicle to operate ***,charging and heating systems based on wireless energy transfer were developed and equipped on the vehicle to investigate optimal charging and heating methods of the batteries in the ***,the data transmission network was designed,a real-time monitoring interface was developed,and the self-developed battery management system was used to measure,collect,upload,and store battery operation data in real ***,experimental validation was performed on the *** demonstrate the efficiency and reliability of the *** state of charge estimation is used as an example to illustrate the availability of battery operation data.

关键词： Intelligent connected electric vehicle Battery Operation data State estimation Wireless energy transfer

The Hybrid Nature of 0846+51W1: a BL Lac Object with a Narrow Line Seyfert 1 Nucleus

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Chinese Journal of Astronomy and Astrophysics 2005年第1期5卷 41-48页

作者： Hong-yanzhou Ting-GuiWang Xiao-BoDong ChengLi Xue-GuangZhang CenterforAstrophysics UniversityofScienceandTechnologyofChinaHefei230026

We found a NLS1 nucleus in the extensively studied eruptive BL Lac object, 0846+51W1, out of a large sample of NLS1s compiled from the spectroscopic dataset of SDSS DR1. Its optical spectrum can be well decomposed into three components: a power law component from the relativistic jet, a stellar component from the host galaxy, and a component from a typical NLS1 nucleus. The emission line properties of 0846+51W1, FWHM (Hβ) (?) 1710 km s-1 and [OⅢ]λ5007/Hβ(?)0.32 from its SDSS spectrum observed when it was in the faint state, fulfil the conventional definition of NLS1. Strong Fell emission is detected in the SDSS spectrum, which is also typical of NLS1s. We tried to estimate its central black hole mass using various techniques and found that 0846+51W1 is very likely emitting at a few ×10% of the Eddington luminosity. We speculate that Seyfert-like nuclei, including NLS1s, might be concealed in a significant fraction of BL Lacs but have remained largely unobserved because, often, their optical-UV continuum is overwhelmed by the synchrotron emission.

关键词： galaxies: active - galaxies: Seyfert - galaxies: BL Lacertae - quasars: indevidual (0846+51W1) - radiation: lines continuum

Representing surface wind stress response to mesoscale SST perturbations in western coast of South America using Tikhonov regularization method

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Journal of Oceanology and Limnology 2020年第3期38卷 679-694页

作者： CUI Chaoran ZHANG Rong-Hua WANG Hongna WEI yanzhou Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Qingdao National Laboratory for Marine Science and Technology Qingdao 266000China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

Interaction between mesoscale perturbations of sea surface temperature(SSTmeso)and wind stress(WSmeso)has great influences on the ocean upwelling system and turbulent mixing in the atmospheric boundary *** daily Quik-SCAT wind speed data and AMSR-E SST data,SSTmeso and WSmeso fields in the western coast of South America are extracted by using a locally weighted regression method(LOESS).The spatial patterns of SSTmeso and WSmeso indicate strong mesoscale SST-wind stress coupling in the *** coupling coefficient between SSTmeso and WSmeso is about 0.0095 N/(m^2·℃)in winter and 0.0082 N/(m^2·℃)in *** on mesoscale coupling relationships,the mesoscale perturbations of wind stress divergence(Div(WSmeso))and curl(Curl(WSmeso))can be obtained from the SST gradient perturbations,which can be further used to derive wind stress vector perturbations using the Tikhonov regularization *** computational examples are presented in the western coast of South America and the patterns of the reconstructed WS meso are highly consistent with SSTmeso,but the amplitude can be underestimated *** matching the spatially averaged maximum standard deviations of reconstructed WSmeso magnitude and observations,a reasonable magnitude of WSmeso can be obtained when a rescaling factor of 2.2 is *** current ocean models forced by prescribed wind cannot adequately capture the mesoscale wind stress response,the empirical wind stress perturbation model developed in this study can be used to take into account the feedback effects of the mesoscale wind stress-SST coupling in ocean *** applications are discussed for taking into account the feedback effects of the mesoscale coupling in largescale climate models and the uncoupled ocean models.

关键词： mesoscale air-sea coupling Tikhonov’s regularization method western coast of South America