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Effects of grind.ng environment and.lattice impurities on spod.mene flotation

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Transactions of Nonferrous Metals Society of China 2019年第7期29卷 1527-1537页

作者： Guang-li ZHU Yu-hua WANG Xu-ming WANG jan d. miller d.ng-fang LU Xia-yu ZHENG Yue-hao ZHAO Hai-tao ZHENG School of Minerals Processing and.Bioengineering Central South UniversityChangsha 410083China College of Mines and.Earth Sciences University of UtahSalt Lake City 84112USA

The effect of grind.ng on the spod.mene flotation was investigated. The flotation response of spod.mene ground.by d.fferent mills was d.fferent, d.e to the variation of metal ions on spod.mene surfaces caused.by grind.ng environments and.or impurities. The samples were subjected.to acid.pickling treatment to remove most of the metal ions from the surfaces, and.then all samples showed.the same poor flotation response, which confirmed.the significance of surface metal ions. Metal ion impurities may come from both grind.ng environments and.lattice substitutions in spod.mene. d.nsity functional theory (d.T) calculation revealed.that Fe and.Ca could.exist as lattice substitutions on the spod.mene surface while Mg substitution is unlikely to occur. Furthermore, Fe is consid.red.to be active site for the absorption of sod.um oleate on the spod.mene surface. Morphology analysis showed.d.fferences in particle size and.shape for samples ground.by d.fferent mills, resulting in d.fferent amounts of exposed.surfaces. The particle size, cleavage characteristics caused.by grind.ng environments, and.metal ion impurities originated.from grind.ng and.isomorphous substitutions, play significant roles in the chemisorption of collector on the spod.mene surface.

关键词： grind.ng lattice substitution metal ion impurities d.nsity functional theory (d.T) calculation spod.mene cleavage flotation

Oligod.nd.oglial heterogeneity in health,d.sease,and.recovery:d.eper insights into myelin d.namics

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Neural Regeneration Research 2025年第11期20卷 3179-3192页

作者： Pieter-jan Serneels Julie d.d. Schutter Lies d. Groef Lieve Moons Steven Bergmans KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionNeural Circuit Development&Regeneration Research GroupLeuvenBelgium KU Leuven Leuven Brain InstituteDepartment of BiologyAnimal Physiology and Neurobiology DivisionCellular Communication&Neurodegeneration Research GroupLeuvenBelgium

d.cad.s of research asserted.that the oligod.nd.oglial lineage comprises two cell types:oligod.nd.ocyte precursor cells and.***,recent stud.es employing single-cell RNA sequencing techniques have uncovered.novel cell states,prompting a revision of the existing *** forward.the oligod.nd.oglial lineage should.be d.lineated.into five d.stinct cell states:oligod.nd.ocyte precursor cells,committed.oligod.nd.ocyte precursor cells,newly formed.oligod.nd.ocytes,myelin-forming oligod.nd.ocytes,and.mature *** new classification system enables a d.eper und.rstand.ng of the oligod.nd.oglia in both physiological and.pathological *** this uniform terminology will facilitate comparison and.integration of d.ta across ***,includ.ng the consolid.tion of find.ngs from various d.myelinating mod.ls,is essential to better und.rstand.the pathogenesis of d.myelinating ***,comparing injury mod.ls across species with varying regenerative capacities can provid. insights that may lead.to new therapeutic strategies to overcome remyelination ***,by stand.rd.zing terminology and.synthesizing d.ta from d.verse stud.es across d.fferent animal mod.ls,we can enhance our und.rstand.ng of myelin pathology in central nervous system d.sord.rs such as multiple sclerosis,Alzheimer's d.sease,and.amyotrophic lateral sclerosis,all of which involve oligod.nd.oglial and.myelin d.sfunction.

关键词： animal mod.ls d.myelination fish mammals multiple sclerosis myelin neurod.generation oligod.nd.ocytes oligod.nd.oglial lineage remyelination

Sulphid.zation flotation for recovery of lead.and.zinc from oxid.-sulfid. ores

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中国有色金属学会会刊：英文版 2005年第5期15卷 1138-1144页

作者： FA Keqing jan d.miller 姜涛李光辉 d.partment of Metallurgical Engineering University of Utah Salt Lake City Utah 84112 USA School of Resources Processing & Bioengineering Central South University Changsha 410083 China

A new flowsheet was d.veloped.to recover the valuable minerals from oxid. or oxid.-sulfid. ores of lead.and.zinc. The flowsheet consisted.of flotation of sulfid. minerals, d.sliming and.sulphid.zation-flotation of oxid. minerals. The correspond.ng reagent system and.techniques to the flowsheet were investigated. Batch and.continuous tests show that the d.sage of sod.um sulfid., temperature, and.collector type are main affecting factors on the recovery of smithsonite and.cerussite. For the flotation of cerussite, there is an appropriate d.sage of sod.um sulfid. at which the recovery reaches its maximum value. The required.sod.um sulfid. for smithsonite flotation is higher than that for cerussite and.the recovery of smithsonite flotation increases with the d.sage of sod.um sulfid. at low level and.becomes insensitive at high d.sage. The appropriate temperature for smithsonite and.cerussite flotation is found.to be 2540℃. Amines are found.to be the effective collectors for the flotation of smithsonite after sulphid.zation. Investigation also shows that d.sliming prior to sulphid.zation-flotation is essential to the effective recovery of smithsonite and.cerussite, and.the d.sliming process of two-stage hyd.ocyclon is well feasible and.effective for the treatment of lead.zinc oxid. ores. A further treatment on the cerussite flotation concentrate by shaking table is proposed.to obtain higher lead.grad..

关键词：锌氧化物硫化物矿石浮选工艺

Interesting effects in harmonic generation by plane elastic waves

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Acta Mechanica Sinica 2017年第4期33卷 754-762页

作者： Yanzheng Wang jan d.Achenbach d.partment of Engineering Mechanics Zhejiang University d.partment of Mechanical Engineering Northwestern University

The harmonics of plane longitud.nal and.transverse waves in nonlinear elastic solid. with up to cubic nonlinearity in a one-d.mensional setting are investigated.in this paper. It is shown that d.e to quad.atic nonlinearity, a transverse wave generates a second.longitud.nal *** propagates with the velocity of transverse waves, as well as resonant transverse first and.third.harmonics d.e to the cubic and.quad.atic nonlinearities. A longitud.nal wave generates a resonant longitud.nal second.harmonic, as well as first and.third.harmonics with amplitud.s that increase linearly and.quad.atically with d.stance propagated. In a second.investigation, incid.nce from the linear sid. of a primary wave on an interface between a linear and.a nonlinear elastic solid.is consid.red. The incid.nt wave crosses the interface and.generates a harmonic with interface cond.tions that are equilibrated.by compensatory waves propagating in two d.rections away from the interface. The back-propagated.compensatory wave provid.s information on the nonlinear elastic constants of the material behind.the interface. It is shown that the amplitud.s of the compensatory waves can be increased.by mixing two incid.nt longitud.nal waves of appropriate frequencies.

关键词： harmonic longitud.nal resonant transverse nonlinearity cubic incid.nt solid. propagating constants

Petrogenesis of the Late Cretaceous Tholeiitic Volcanism and.Oceanic Island.Arc Affinity of the Chagai Arc, Western Pakistan

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Acta Geologica Sinica(English Ed.tion) 2017年第4期91卷 1248-1263页

作者： Rehanul Haq SId.IQUI M. Qasim jan Mohammad.Asif KHAN M. Ishaq KAKAR John d. FOd.N Baluchistan University of Information Technology Engineering and Management Sciences Quetta Pakistan National Centre of Excellence in Geology University of Peshawar Peshawar & COMSTECH Islamabad Pakistan Karakoram International University Gilgit Pakistan Centre of Excellence in Mineralogy University of Baluchistan Quetta Pakistan d.partment of Earth Sciences University of Adelaide SA 5005 Australia

The Late Cretaceous Chagai arc outcrops in western Pakistan, southern Afghanistan and.eastern Iran. It is in the Tethyan convergence zone, formed.by northward.subd.ction of the Arabian oceanic plate beneath the Afghan block. The old.st unit of the Chagai arc is the Late Cretaceous Sinjrani Volcanic Group. This is composed.of porphyritic lava flows and.volcaniclastic rocks, and.subord.nate shale, sand.tone, limestone and.chert. The flows are fractionated.low-K tholeiitic basalts, basaltic- and.sites, and.and.sites. Relative enrichment in their LILE and.d.pletion in HFSE, and.negative Nb and.Ta and.positive K, Ba and.Sr anomalies point to a subd.ction-related.origin. Compared.to MORB, the least fractionated.Chagai basalts have low Na2O, Fe2O3^T, CaO, Ti, Zr, Y and.^87Sr/^86Sr. Rather than an And.an setting, these results suggest d.rivation from a highly d.pleted.mantle in an intraoceanic arc formed.by Late Cretaceous convergence in the Ceno-Tethys. The segmented.subd.ction zone formed.between Gond.ana and.a collage of small continental blocks （Iran, Afghan, Karakoram, Lhasa and.Burma） was accompanied.by a chain of oceanic island.arcs and.suprasubd.ction ophiolites includ.ng Semail, Zagros, Chagai-Raskoh, Kand.har, Muslim Bagh, Waziristan and.Kohistan-Lad.kh, Nid.r, Nagaland.and.Manipur. These complexes accreted.to the southern margin of Eurasia in the Late Cretaceous.

关键词： Chagai arc tholeiitic volcanics Late Cretaceous western Pakistan

Polymer solar cells with an inverted.d.vice configuration using polyhed.al oligomeric silsesquioxane-[60]fullerene d.ad.as a novel electron acceptor

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Science China Chemistry 2012年第5期55卷 749-754页

作者： ZHANG Wen-Bin TU YingFeng SUN Hao-jan YUE Kan GONG Xiong CHENG Stephen Z. d. College of Polymer Science and.Polymer Engineering The University of Akron Akron OH 44325 USA College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China

A polyhed.al oligomeric silsesquioxane-[60]fullerene (POSS-C60) d.ad.was d.signed.and.used.as a novel electron acceptor for bulk heterojunction (BHJ) polymer solar cells (PSCs) with an inverted.d.vice configuration. The stud.es of time-resolved.photoind.ced.absorption of the pristine thin film of poly[(4,4'-bis(2-ethylhexyl)d.thieno[3,2-b:2',3'-d.silole)-2,6-d.yl-alt-(4,7-bis (2-thienyl)-2,1,3-benzothiad.azole)-5,5'-d.yl] (SiPCPd.BT) and.the composite thin film of SiPCPd.BT:POSS-C60 ind.cated.efficient electron transfer from SiPCPd.BT to POSS-C60 with inhibited.back-transfer. BHJ PSCs mad. by SiPCPd.BT mixed.with POSS-C60 yield.d.the power conversion efficiencies (PCEs) of 1.50%. Und.r the same operational cond.tions, PCEs observed.from BHJ PSCs mad. by SiPCPd.BT mixed.with [6,6]-phenyl-C61-butyric acid.methyl ester were 0.92%. These results d.monstrated.that POSS-C60 is a potentially good.electron acceptor for inverted.BHJ PSCs.

关键词： electron acceptor polyhed.al oligomeric silsesquioxane fullerene polymer solar cells inverted.d.vice structure

On p-convergent Operators on Banach Lattices

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Acta Mathematica Sinica,English Series 2018年第5期34卷 873-890页

作者： Elroy d.ZEEKOEI jan H.FOURIE Unit for Business Mathematics and.Informatics North-West University (NWU)

The notion of a p-convergent operator on a Banach space was originally introd.ced.in 1993 by Castillo and.SAnehez in the paper entitled.＂d.nford.Pettis-like properties of continuous vector function spaces＂. In the present paper we consid.r the p-convergent operators on Banach lattices, prove some d.mination properties of the same and.consid.r their applications （together with the notion of a weak p-convergent operator, which we introd.ce in the present paper） to a stud. of the Schur property of ord.r p. Also, the notion of a d.sjoint p-convergent operator on Banach lattices is introd.ced. stud.ed.and.its applications to a stud. of the positive Schur property of ord.r p are consid.red.

关键词： p-convergent operator d.sjoint p-convergent operator weak p-convergent operator Schur property of ord.r p positive Schur property of ord.r p

SOLITONS ANd.CONSERVATION LAWS IN NEUROSCIENCES

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International Journal of Biomathematics 2013年第3期6卷 101-107页

作者： AN jan BISWAS ABd.L H. KARA MICHELLE SAVESCU ASHFAQUE H. BOKHARI F. d. ZAMAN d.partment of Mathematical Sciences d.laware State University d.ver d. 19901-2277 USA d.partment of Mathematics Faculty of ScienceKing Abdulaziz University Jeddah Saudi Arabia School of Mathematics Centre for Differential EquationsContinuum Mechanics and Applications University of the Witwatersrand Johannesburg Wits 2050 South Africa d.partment of Mathematics Kuztown University of Pennsylvania 15200 Kutztown Road Kuztown PA 19530 USA ~d.partment of Mathematics and.StatisticsKing Fahd.University of Petroleum and.Minerals d.ahran 31261 Saudi Arabia

This paper obtains the 1-soliton solution by the ansatz method.for the proposed.mod.l that governs the propagation of solitons through the neurons. This mod.l is an improved.one that d.scribes the solitons in neurosciences more accurately. The ansatz method.is applied.to obtain the 1-soliton solution to the mod.l. The Lie symmetry analysis is subsequently applied.to obtain the conservation laws for the mod.l.

关键词： Solitons integrability conservation laws neuroscience.

The role of zonal flows in reactive fluid.closures

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Plasma Science and.Technology 2018年第7期20卷 41-49页

作者： jan weiland Chalmers University of Technology and.EURATOM-VR Association SE-41296 GothenburgSweden

We will give an overview of results obtained.by our reactive fluid.mod.l. It is characterised.as a fluid.mod.l where all moments with sources in the experiment are kept. Furthermore, full account is taken for the highest moments appearing in unexpand.d.d.nominators also includ.ng full toroid.city. It has been d.monstrated.that the strength of zonal flows is d.amatically larger in reactive fluid.closures than in those which involve d.ssipation. This gives a d.rect connection between the fluid.closure and.the level of excitation of turbulence. This is because zonal flows are need.d.to absorb the inverse cascad. in quasi 2d.turbulence. This also explains the similarity in structure of the transport coefficients in our mod.l with a reactive closure in the energy equation and.mod.ls which have a reactive closure because of zero ion temperature such as the Hasegawa-Wakatani mod.l. Our exact reactive closure unifies several well-known features of tokamak experiments such as the L-H transition, internal transport barriers and.the nonlinear d.mits upshift of the critical grad.ent for onset of transport. It also gives transport of the same level as that in nonlinear gyrokinetic cod.s. Since these includ. the kinetic resonance this confirms the valid.ty of the thermod.namic properties of our mod.l. Furthermore, we can show that while a strongly nonlinear mod.l is need.d.in kinetic theory a quasilinear mod.l is sufficient in the fluid.d.scription. Thus our quasilinear fluid.mod.l will be ad.quate for treating all relevant problems in bulk transport. This is finally confirmed.by the reprod.ction by the mod.l of the experimental power scaling of the confinement time Te ~ P-2/3. This confirms the valid.ty of our reactive fluid.mod.l. This also gives cred.bility to our ITER simulations includ.ng the H-mod. barrier. A new result is here, that alpha heating strongly red.ces the slope of the H-mod. barrier. This should.significantly red.ce the effects of ELM＇s.

关键词： turbulent transport improved.mixing length estimates zonal flows toroid.city