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The Late Proterozoic Continental Accretionary History of the Southeastern Margin of Jiangnania

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Acta Geologica Sinica(English Edition) 1992年第3期66卷 283-299页

作者： k.a.foland Department of Geology and Mineralogy the Ohio State UniversityColumbusOH 43210USA

The newly obtained Sm-Nd isochron ages are 1034 Ma and 935 Ma for ophiolites from northeasternJiangxi and Fuchuan, southern Anhui respectively. There exist two unconformity surfaces under the initialLate Proterozoic volcanics as well as the Sinian rocks. The Xiuning intrusive body which was intruded into theShangxi Group in southern Anhui yields a whole-rock Rb-Sr isochron age of 963 Ma. There occurs a belt ofLate Proterozoic calc-alkali volcanic rocks extending from northeastern Jiangxi to northwestern Zhejiang. Inthe light of the above facts, the authors consider that the southeastern margin of Jiangnania is an ancient islandarc. At about 1000 Ma ago, the Huanan (South China) oceanic crust was subducted along the line linking Dex-ing and Hangzhou, thus starting the accretion of the island arc system to Jiangnania. At 800 Ma ago Cathaysiaand Jiangnania converged together along the Jiangshan-Shaoxing line, marking the end of the accretion.

关键词： Jiangnania Late Proterozoic continental accretion

CAVITATION NUCLEI:EXPERIMENTS AND THEORY

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Journal of Hydrodynamics 2009年第2期21卷 176-189页

作者： MφRCH k.a. Department of Physics and Center of Quantum Protein DK-2800 Kongens LyngbyDenmark

The Swedish astrophysicist and Nobel Prize winner Hannes Alfven said： Theories come and go -- the experiment is here forever. Often a theory, which we set up to describe an observed physical phenomenon, suffers from the lack of knowledge of decisive parameters, and therefore at best the theory becomes insufficient. Contrary, the experiment always reveals nature itself, though at prevailing experimental conditions. With essential parameters being out of control and even maybe unidentified, apparently similar experiments may deviate way beyond our expectations. However, these discrepancies offer us a chance to reflect on the character of the unknown parameters. In this way non-concordant experimental results may hold the key to the development of better theories - and to new experiments for the testing of their validity. Cavitation and cavitation nuclei are phenomena of that character.

关键词： cavitation nuclei gas bubbles surface nano voids scanning tunneling microscopy atomic force microscopy

Cooling age of Dabie orogen, China, determined by ^(40)Ar-^(39)Ar and fission track techniques

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Science China Chemistry 1995年第6期38卷 749-757页

作者：陈江峰谢智刘顺生李学明 k.a.foland Department of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China Changsha Tectonic Institute Chnese Academy of Sciences Changsha 410013 Department of Geological Sciences Ohio State University Columbus OH 43210.USA

Based on 40Ar-39Ar results of hornblendes and biotites and fission track dating results of apatites separated from the same rock samples, cooling history of rocks from Dabie orogen is discussed. Rocks from both Southern Dabie Terrain (SDT) and Northern Dabie Terrain (NDT) have an early fast cooling followed by a more recent slow cooling. Rocks from SDT cooled to about 540℃ at about 190 Ma B.C., while rocks from NDT cooled to about 540℃ at 125 Ma B C. Until about 110-120 Ma B.C., rocks from both SDT and NDT cooled to about 100℃. This suggests that a relative movement among rocks from SDT, NDT and ul-Ira-high pressure metamorphic rocks exis-ts before 110-120 Ma B.C.

关键词： Dabie orogen cooling history 40Ar-39Ar dating fission track dating blocking temperature.

Stability of multiple fans in mine ventilation networks

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International Journal of Mining Science and Technology 2013年第4期23卷 558-560页

作者： El-Nagdy k.a. Mining Engineering Department Faculty of Petroleum and Mining Engineering Suez Canal University

In large mines,single fan is usually not enough to ventilate all the working *** mine-fan approach cannot be directly applied to multiple-fan networks because the present of multiple pressures and air quantities associated with each fan in the ***,each fan in a multiple-fan system has its own mine characteristic curve,or a subsystem *** some consideration,the conventional concept of a mine characteristic curve of a single-fan system can be directly extended to that of a particular fan within a multiple-fan *** this paper the mutual effect of the fans on each other and their effect on the stability of the ventilation network were investigated by Hardy Cross algorithm combined with a switching-parameters *** show the validity and reliability of this algorithm,the stability of the ventilation system of Abu-Tartur Mine(one of the largest underground mine in Egypt)has been studied.

关键词： Mine ventilation Multiple fan ventilated network Hardy Cross algorithm Switching parameters technique Abu-Tartur Mine

Microstructural Development and Deformation Mechanisms during Cold Rolling of a Medium Stacking Fault Energy TWIP Steel

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Journal of Materials Science & Technology 2013年第2期29卷 161-167页

作者： k.a. Ofei L. Zhao J. Sietsma Materials Innovation Institute M2i Mekelweg 2 2628 CD Delft The Netherlands Department of Materials Science and Engineering Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands

The magnetic response, microstructural and texture changes occurring during cold rolling of a Fe-14Mn-0.64C-2.4AI-0.25Si medium stacking fault energy TWlP （twinning induced plasticity） steel have been studied by X-ray diffraction and magnetic techniques. The changes in the sub-grain size （Ds）, probability of stacking fault formation （Psf） and microstrain in the material as cold rolling progressed were determined by using a modified version of the Williamson and Hall equation. A strong development of the crystallographic texture with increasing deformation was observed. Deformation-induced formation of a small fraction α＇-martensite was observed, indicating that the steel also exhibits γ→α＇-martensite transformation during cold rolling, which is discussed via the changes of the stacking-fault probability and the texture development during cold rolling.

关键词： TWIP steel α'-Martensite Sub-grain size Probability of stacking fault formation Texture development

PROVENANCES OF LOW GRADE METAMORPHIC AND SEDIMENTARY ROCkS FROM SOUTHERN ANHUI PROVINCE: EVIDENCE OF Nd ISOTOPE COMPOSITIONS

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Chinese Science Bulletin 1990年第9期35卷 747-750页

作者：陈江峰周泰禧邢凤鸣徐祥 k.a.foland Universitv of Science and Technology of China Hefei 230026 PRC Anhui Institute of Geological Sciences Hefei 230001 PRC The Ohio State University U. S. A.

Nd isotope model ages of clastic sedimentary rocks are useful for tracing provenances of sediments and reconstructing evolutionary history of sedimentary basins as well as estimating the average age of the continental crust. In this report we present the Nd isotope ratios and model ages determined for the low grade metamorphic and sedimentary rocks from southern Anhui.

关键词： Nd isotope model age provenance of sediments southern Anhui Province.

Regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheimer porous medium

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 193-208页

作者： k.MUHAMMAD M.SARFRAZ Department of Humanities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of Mathematics Quaid-i-Azam University

This article presents a mathematical model addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate remains stationary, while the other moves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheimer porous medium. A mixture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is formulated. In contrast to the conventional Fourier's heat flux equation, this study employs the Cattaneo-Christov heat flux equation. A uniform magnetic field is applied perpendicular to the flow direction, invoking magnetohydrodynamic(MHD) effects. Further, the model accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem is solved via NDSolve in MATHEMATICA. Numerical and statistical analyses are conducted to provide insights into the behavior of the nanomaterials between the parallel plates with respect to the flow, energy transport, and skin *** findings of this study have potential applications in enhancing cooling systems and optimizing thermal management strategies. It is observed that the squeezing motion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed more vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less time in the region between the plates. The thermal relaxation, however, abruptly changes the temperature, leading to a decrease in the temperature fluctuations.

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Effects of P301L-TAU on post-translational modifications of microtubules in human iPSC-derived cortical neurons and TAU transgenic mice

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Neural Regeneration Research 2025年第8期20卷 2348-2360页

作者： Mohamed Aghyad Al kabbani Christoph köhler Hans Zempel Institute of Human Genetics Faculty of Medicine and University Hospital CologneUniversity of CologneCologneGermany Center for Molecular Medicine Cologne(CMMC) University of CologneCologneGermany Center Anatomy Department ⅡMedical FacultyUniversity of CologneCologneGermany

TAU is a microtubule-associated protein that promotes microtubule assembly and stability in the *** is missorted and aggregated in an array of diseases known as *** are essential for neuronal function and regulated via a complex set of post-translational modifications,changes of which affect microtubule stability and dynamics,microtubule interaction with other proteins and cellular structures,and mediate recruitment of microtubule-severing *** impairment of microtubule dynamics causes neuronal dysfunction,we hypothesize cognitive impairment in human disease to be impacted by impairment of microtubule *** therefore aimed to study the effects of a disease-causing mutation of TAU(P301L)on the levels and localization of microtubule post-translational modifications indicative of microtubule stability and dynamics,to assess whether P301L-TAU causes stability-changing modifications to *** investigate TAU localization,phosphorylation,and effects on tubulin post-translational modifications,we expressed wild-type or P301L-TAU in human MAPT-kO induced pluripotent stem cell-derived neurons(i Neurons)and studied TAU in neurons in the hippocampus of mice transgenic for human P301L-TAU(p R5 mice).Human neurons expressing the longest TAU isoform(2N4R)with the P301L mutation showed increased TAU phosphorylation at the AT8,but not the p-Ser-262 epitope,and increased polyglutamylation and acetylation of microtubules compared with endogenous TAU-expressing neurons.P301L-TAU showed pronounced somatodendritic presence,but also successful axonal enrichment and a similar axodendritic distribution comparable to exogenously expressed 2N4R-wildtype-TAU.P301L-TAU-expressing hippocampal neurons in transgenic mice showed prominent missorting and tauopathy-typical AT8-phosphorylation of TAU and increased polyglutamylation,but reduced acetylation,of microtubules compared with non-transgenic *** sum,P301L-TAU results in changes in micr

关键词： human induced pluripotent stem cell microtubules P301L pR5 mice TAU tauopathy tubulin code

苏州复式花岗岩体的精确^(40)Ar-^(39)Ar定年

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岩石学报 1993年第1期9卷 77-85页

作者：陈江峰 k.a.foland 刘义茂中国科学技术大学地球和空间科学系合肥230026 Department of Geological Sciences The Ohio State University 中国科学院地球化学研究所广州510640

^(40)Ar-^(39)Ar定年时,通过中子辐照时样品的交叉放置,把J值误差减到最小,从而可以比较样品之间小于1Ma的年龄差别。应用这种改进技术.对苏州复式岩体的三个侵入阶段花岗岩中的黑云母作了系统的^(40)Ar-^(39)Ar定年研究。结果表明苏州... 详细信息

^(40)Ar-^(39)Ar定年时,通过中子辐照时样品的交叉放置,把J值误差减到最小,从而可以比较样品之间小于1Ma的年龄差别。应用这种改进技术.对苏州复式岩体的三个侵入阶段花岗岩中的黑云母作了系统的^(40)Ar-^(39)Ar定年研究。结果表明苏州花岗岩约在127Ma形成。三个阶段花岗岩的定位以及与第三阶段有关的成矿作用,是在大约0.5Ma内完成的。

关键词：花岗岩岩体氩40-氩39 年龄氩