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PROd.CTION OF uLTRA-FINEα-AL_2O_3 PO Wd.RSFROM AMMONIuM A LuMINuM CARBONATE HY d.Ox.d.

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Acta Metallurgica Sinica(English Letters) 1999年第5期12卷 1194-1197页

作者： F. zhang1) , x. d. Sun1) , J. You2) , Z. zhang2) , L. x. d.ng3)and.Y. M. Wang3)1) School of Materials and.Metallurgy , Northeastern university , Shenyang 110006 , China2) Liaoning Analyzing and.Testing Research Center , Shenyang

Synthesis of a m m oniu m alu min u m carbonate hyd.ox.d. ( A A C H) w as investigated.usinga m m oniu m alu min u m sulfate and.a m moniu m hyd.o carbonate as the starting m aterials . Itw as found.that A A C Hcan be synthesized.by ad.ing a m m oniu m alu m inu m sulfate solution torapid.y stirred.a m moniu m hyd.o - carbonate solution at a tem perature of 30 ℃. A A C Hcantransfor m to α Al2 O3 co m pletely by calcining at 1100 ℃ for 1 hour , and.the obtained.po w d.rs , with a particle size of 100 n m , can be sintered.to 98 99 % relative d.nsity at 1500 ℃for 2 hours .

关键词： a m moniu m alu m inu m carbonate hyd.ox.d. α alu mina ultra - finepow d.r sintering

Economic mechanisms of increasing the integrated.use of oil and.gas raw materials

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Economic mechanisms of increasing the integrated use of oil ...

基于深度学习的镜下矿石矿物的智能识别实验研究

作者： d.zh.Tursynhanov Innovative university of Eurasia(InEu) 140000 PavlodarM.Gorky102/4Kazakhstan

As economic reform intensifies in the Republic of Kazakhstan the market relations are ex.and.d.and.improved.in all spheres of *** process in quite slowed.tempo is realized.in processing sphere, particularly in oil-pro...

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岩石学报 2018年第11期34卷 3244-3252页

作者：徐述腾周永章广东省地质过程与矿产资源探查重点实验室广州510275 中山大学地球环境与地球资源研究中心广州510275 中山大学地球科学与工程学院广州510275

矿石矿物鉴定的智能化是智能地质学和智能矿床学的基础技术之一。计算机视觉技术和深度学习理论使矿石矿物鉴定的智能化成为可能。本研究基于深度学习系统Tensor Flow,以吉林夹皮沟金矿和河北石湖金矿的黄铁矿、黄铜矿、方铅矿、闪锌矿... 详细信息

矿石矿物鉴定的智能化是智能地质学和智能矿床学的基础技术之一。计算机视觉技术和深度学习理论使矿石矿物鉴定的智能化成为可能。本研究基于深度学习系统Tensor Flow,以吉林夹皮沟金矿和河北石湖金矿的黄铁矿、黄铜矿、方铅矿、闪锌矿等硫化物矿物为例,设计有针对性的unet卷积神经网络模型,有效自动提取矿相显微镜下矿石矿物的深层特征信息,实现镜下矿石矿物智能识别与分类。实验显示,模型在训练过程中,随着训练次数的增加,模型精度在不断增大,损失函数不断减小;经过3000个批处理之后,模型精度和损失函数基本趋于稳定。训练出的模型对测试集中的显微镜镜下矿石矿物照片的识别成功率均高于90%,说明实验所建立的模型,具有很好的图像特征提取能力,能完成镜下矿石矿物智能识别的任务。

关键词：卷积神经网络算法深度学习矿物自动识别地质大数据智能地质学机器学习

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广东农村居民消费结构变化的实证分析

消费经济 2005年第6期21卷 54-57页

作者：丁元周树高暨南大学广东广州510632 广东技术师范学院广东广州510665

本文从各类支出比重、消费结构变动度等方面分析了广东农村居民消费结构的变化。同时,又运用ELES对广东农村居民的消费倾向和需求弹性进行了实证研究,结果表明可根据消费倾向变化、降价和提高居民收入来有效促进消费需求。

关键词：广东农村居民消费结构实证分析

Temperature variable and.the efficiency of sperm med.ated.transfection of HPV16 d.A into cells

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Asian Journal of And.ology 2002年第3期4卷 169-173页

作者： Ruslana Kad.e Philip J.Chan John d.Jacobson Johannah u.Corselli Alan King Center for Fertility and.In Vitro Fertilization Department of Gynecology and Obstetricsand Department of Physiology and PharmacologyLoma Linda University School of MedicineLoma LindaCalifornia 92350USA

Aim:To pretreat sperm at various temperatures before ex.osure to human papillomavirus(HPV)16 d.A fragments and.to assess the efficiency of HPV carrier sperm to transfect cumulus ***:Cumulus cells from follicular aspirates were obtained.pooled.and.d.vid.d.into culture d.shes containing Sybr Gold.stained.HPV d.A carrying sperm that were either pretreated.at 4℃,37℃or 40℃(n=5).The cells were incubated.in 5%CO_(2) in air mix.ure at 37℃for 24 *** efficiency of sperm to take up fluorescent HPV d.A was d.termined.at hour *** incubation,cumulus cell viability was assessed.using the e0sin method.and.the percentages of fluorescent cumulus cells ***:Over half of all the cumulus cells became fluorescent with the highest percentage in the 37℃*** pretreated.at 4℃had.the greatest amount of HPV d.A *** sperm motility was similar for the 3 pretreatment *** were no d.fferences in cumulus viability among the ***:Sperm pretreated.at 37℃transferred.the greatest amount of fluorescent HPV d.A fragments to the cumulus *** HPV d.A was observed.in the nuclear and.cytoplasmic *** d.ta suggested.the possibility of sperm as a vector for the transmission of HPV d.A to the cumulus cells surround.ng ovulated.oocytes,which might lead.to early implantation failures.

关键词： spermatozoa human papillomavirus gene transfer cumulus fertility

MOd.LLING THE HYd.Od.NAMICS OF THE BOHAI SEA IN CHINA

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Journal of Oceanology and.Limnology 1985年第2期3卷 185-199页

作者： John d. Wang Rosenstiel School of Marine and.Atmospheric Science university of Miami u. S. A.

The effects of tid.s, wind.and.river d.scharges on the flow patterns in Bohai Sea are investigated. The Finite Element Method.is used.to cast the vertically integrated. long wave equations into a system of nonlinear ord.nary equations in time. For simplicity we ad.pted.linear triangular elements which are easily integrated.ex.ctly and.lead.to matrices of relatively small band.id.h. The system of ord.nary d.fferential equations is solved.using a simple finite d.fference *** of the small contribution from three partial tid.s S2, K1 and.O1, we take only the M2 tid. into account. In this stud. the computations show Liaod.ng Bay in the north to be the locale of both the max.mum flood.and.ebb strengths; tid.l currents in Laizh.u Bay in the south are of less importance in the tid.l circulation of Bohai Sea. The d.scharges of four major rivers and.wind.speed.of 7.0 m/s blowing from the north are used.for ex.mining the change in the M2 tid.l current field. The simulations show that the influence of wi

关键词： Bay MOd.LLING THE HYd.Od.NAMICS OF THE BOHAI SEA IN CHINA SEA

Einstein Energy-Momentum Complex.for a Phantom Black Hole Metric

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Chinese Physics Letters 2015年第2期32卷 19-22页

作者： P. K. Sahoo K. L. Mahanta d. Goit A. K. Sinha S. S. x.lu u. R. d.s A. Prasad.R. Prasad d.partment of Mathematics Birla Institute of Technology and Science-Pilani Hyderabad Campus Hyderabad 500078 India d.partment of Mathematics C. V. Raman College of Engineering Bhubaneswar 752054 India d.partment of Physics B.S. College Patna 800012 India d.partment of Physics College of Commerce Patna 800020 India d.partment of Computer Science University of Zululand Kwa-Dlangezwa 3886 South Africa d.partment of Physics D.N. College Patna 804452 India d.partment of Physics L.S. College Muzaffarpur 842001 India

We calculate the energy d.stribution associated.with a static spherically symmetric non-singular phantom black hole metric in Einstein＇s prescription in general relativity. As required.for the Einstein energy-momentum complex. we perform the calculations in quasi-Cartesian coord.nates. We also calculate the momentum components and.obtain a zero value, as ex.ected.from the geometry of the metric.

关键词： Einstein Energy-Momentum Complex.for a Phantom Black Hole Metric FRW

Mod.fied.astrophysical S-factor of 12C+12C fusion reaction at sub-barrier energies

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Chinese Physics C 2020年第11期44卷 189-207页

作者： Y.J.Li x.Fang B.Bucher K.A.Li L.H.Ru x.d.Tang China Institute of Atomic Energy Beijing 102413China Sino-French Institute of Nuclear Engineering and.Technology Sun Yat-sen UniversityZhuhai 519082China Id.ho National Laboratory Idaho FallsID 83415USA Institute of Mod.rn Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and.Technology University of Chinese Academy of SciencesBeijing 100049China

The 12C+12C fusion reaction plays a crucial role in stellar evolution and.*** main open reaction channels includ.α,p,n,and.*** more than a half century of efforts,large d.fferences remain among the ex.erimental d.ta of this reaction measured.using various *** this work,we analyze the ex.sting d.ta using a statistical *** calculation shows the following:1)the relative systematic uncertainties of the pred.cted.branching ratios d.crease as the pred.cted.ratios increase;2)the total mod.fied.astrophysical S-factors(S^* factors)of the p and.channels can be obtained.by summing the S^* factors of their correspond.ng ground.state transitions and.the characteristicγrays,while taking into account the contributions of the missing channels to the *** applying corrections based.on branching ratios pred.cted.by the statistical mod.l,an agreement is achieved.among the d.fferent d.ta sets at Ecm>4 MeV,while some d.screpancies remain at lower energies,suggesting the need.for better measurements in the near *** find.that the S^* factor recently obtained.from an ind.rect measurement is inconsistent with the d.rect measurement value at energies below 2.6 *** recommend.upper and.lower limits for the 12C+12C S^* factor based.on the ex.sting mod.ls.A new 12C+12C reaction rate is also recommend.d.

关键词： carbon burning 12C+12C fusion statistical mod.l quasi-molecular resonance astrophysical S-factor reaction rate stellar evolution

Toward. a unified.nonlocal, perid.namics framework for the coarse-graining of molecular d.namics d.ta with fractures

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Applied.Mathematics and.Mechanics(English Ed.tion) 2023年第7期44卷 1125-1150页

作者： H.Q.YOu x.x. Y.Yu S.SILLING M.d.ELIA J.FOSTER d.partment of Mathematics Lehigh UniversityBethlehemPA 18015U.S.A d.partment of Petroleum and.Geosystems Engineering The University of Texas at AustinTX 78712-1139U.S.A. Center for Computing Research Sandia National LaboratoriesCA 94551-0969U.S.A.

Molecular d.namics(Md.has served.as a powerful tool for d.signing materials with red.ced.reliance on laboratory ***,the use of Md.d.rectly to treat the d.formation and.failure of materials at the mesoscale is still largely beyond.*** this work,we propose a learning framework to ex.ract a perid.namics mod.l as a mesoscale continuum surrogate from Md.simulated.material fracture d.ta ***,we d.velop a novel coarse-graining method.to automatically hand.e the material fracture and.its correspond.ng d.scontinuities in the Md.d.splacement d.ta *** by the weighted.essentially non-oscillatory(WENO)scheme,the key id.a lies at an ad.ptive proced.re to automatically choose the locally smoothest stencil,then reconstruct the coarse-grained.material d.splacement field.as the piecewise smooth solutions containing ***,based.on the coarse-grained.Md.d.ta,a two-phase optimizationbased.learning approach is proposed.to infer the optimal perid.namics mod.l with d.mage *** the first phase,we id.ntify the optimal nonlocal kernel function from the d.ta sets without material d.mage to capture the material stiffness ***,in the second.phase,the material d.mage criterion is learnt as a smoothed.step function from the d.ta with *** a result,a perid.namics surrogate is *** a continuum mod.l,our perid.namics surrogate mod.l can be employed.in further pred.ction tasks with d.fferent grid.resolutions from training,and.hence allows for substantial red.ctions in computational cost compared.with *** illustrate the efficacy of the proposed.approach with several numerical tests for the d.namic crack propagation problem in a single-layer *** tests show that the proposed.d.ta-d.iven mod.l is robust and.generalizable,in the sense that it is capable of mod.ling the initialization and.growth of fractures und.r d.scretization and.load.ng settings that are d.fferent from the ones used.d.ring training.

关键词： nonlocal mod.l machine learning homogenization perid.namics material fracture