检索结果-南通市图书馆

CORROsION REsIsTANCE OF hOT DIP GALVANIZED sTEEL PRETREATED WITh BIs-FUNCTIONAL sILANEs MODIFIED WITh NANOALUMINA

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2008年第4期21卷 245-252页

作者： F.J. shan C.s. Liu s.h. wang G.C. Qi Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110004 China Material ＆ Chemical Engineering College Liaoning University of Technology Jinzhou 121001 China

The corrosion behavior of hot dip galvanized steel pretrvated with bis-[triethoxysilylpropyl] tetrasulfide （BTEsPT） modified with alumina particles was studied. The corrosion resistance of the passiving films was evaluated by Tafel polarization curve and electrochemical impedance spectroscopy. The films formed on the galvanized steel substrate were characterized by Fourier transform infrared spectroscopy and energy dispersive X-ray spectrometry. The surface morphology of the treated hot dip galvanized steel samples was observed by Field Emission scanning Electron Microscope. The results show that the pretrvatments on the basis of silane films modified with nanoalumina particles.h.ve reduced both anodic and cathodic current densities, and increased total impedance in the measured frequency, consequently, improving corrosion protection for hot dip galvanized steel during immersion in NaCl solutions compared to chromate films and silane films.

关键词： Bis-sulfur silane Nanoalumina Corrosion protection Characterization hot dip galvanised steel

AMINO-TRIs-(METhYLENEPhOs.h.NIC ACID)LAYERs ADsORPTION ON AA6061 ALUMINUM ALLOY

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2008年第5期21卷 355-361页

作者： s.h. wang C.s. Liu F.J. shan G.C. Qi Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110004 China Material＆ Chemical Engineering College Liaoning University of Technology Jinzhou 121001 China

The amino-tri-（methylenephos.h.nic acid） layers were adsorbed on the surface of AA6061 aluminum alloy for improving the lacquer adhesion and corrosion inhibition as a substitute for chromate coatings. The surface structure and characteristic of the amino-tri-（methylenephos.h.nic acid） layers on AA6061 aluminum alloy were investigated by means of XPs and ATR-FTIR analysis. The analyzed results showed that the amino-tri-（methylenephos.h.nic acid） adsorption layers adsorb on the surface of aluminium alloy via acid-base interaction in a bi-dentate conformation. After the amino-tri-（methylenephos.h.nic acid） layers were coated with epoxy resin, the layers showed good adhesive strength and favorable corrosion resistance in contrast to chromate coatings.

关键词： Amino-tri-(methylenephos.h.nic acid) layer Organophos.h.nate Aluminum alloy Corrosion resistance

OXIDATION BEhAVIOR OF Ni_3Al AND NiAl ALLOYs CONTAINING Fe ADDITIONs

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 1996年第6期9卷 641-645页

作者： J.T.Guo s.h. wang h. Li W.h. Lai and M.h.Tan(Institute of Metal Research, Chinese Academy of sciences, shenyang 110015, ) Inst of Metal Research Chinese Acad of Sciences Shenyang China

The isothermal oxidation behavior of Ni_3Al containtng 15 at.% Fe and NiAl containing 30 at.% Fe was studied for 100 h at 850, 950, 1050 and 1150℃, respectively. The results show that the oxidation kinetics of the two alloys obey a parabolic law at various temperatures and every parabolic curve possesses two oxidation rate constants. The morphology, microstructure and the chemical composition of the oxide scales were examined using optical metallography, X-ray diffraction analysis, scanning electron microscopy and electron probe microanalysis. The oxide scale of Ni_3Al containing 15 at.% Fe consists mainly of NiO, NiFe_2O_4, and FeAl_2O_4, and that of NiAl containing 30 at.% Fe consists of Fe_2O_3 and (Fe,Ni)Fe_2O_4, contrasting sharply to the oxide scales of pure Ni_3Al and NiAl which consist of Al_2O_3. The oxide scales on the surfaces of Ni_3Al and NiAl containing Fe are not too dense and not too cohesive to the matrix,so their oxidation resistance is not too good.

关键词： oxidation kinetics Ni_3Al-Fe,NiAl-Fe

Phase Evolution and Magnetic studies of La and Refractory Metals Co-substituted α-Fe/R_2Fe_(14)B-type Nanocomposites

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2000年第2期16卷 102-106页

作者： W. C. Changt, s.h. wang, s.J. Chang and M. Y. Tsai (Department of Physics, Chung Cheng University, Ming-hsiung, Chia-Yi, 621, Taiwan-China Q.Chen) (Rhodia Inc., Rare Earths and Gallium, CN 7500, Cranbury, New Jersey 08512, U.s.A.) Department of Physics Chung Cheng University Ming-Hsiung Chia-Yi 621 Taiwan Rhodia Inc. Rare Earths and Gallium CN 7500 Cranbury NJ 08512 United States

Phase evolution and magnetic properties of (Nd_o.95La_0.05)9.5-11Febal.M_2B10.5. where M=Cr, Ti, Nb, V, Mo, Zr, hf, Ta, Mn or W, melt spun ribbons.h.ve been investigated. Almost all the alloy ribbons. except for(Nd_0.95La_0.05)_9.5Fe_78M_2B_10.5(M=Mo and Mn),consist merely two magnetic phases, namely α-Fe and R_2Fe_14B, which display a better combination of _ih_c and magnetic energy product. Remanence (Br) and coercivity (i_h_c) values in the range of 8.0 to 9.1 kG and 9.5 to 18.9 kOe. respectively, can be achieved. Among compositions studied, the Ti and W-substitutions were found to be most effective in increasing the Br and i_h_c, respectively. For a fixed refractory metal substitution, namely, M=C_r, Ti or Nb, an increase in the total rare earth concentration resulted in nanocomposites of small grain sizes and a high volume fraction of the R_2Fe_14B phase, leading to an increase in the magnetic properties.

关键词： Fe/R2Fe B-type Nanocomposites Phase Evolution and Magnetic studies of La and Refractory Metals Co-substituted type La

The autophagy protein Atg9 functions in glia and contributes to parkinsonian symptoms in a Drosophila model of Parkinson’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第5期19卷 1150-1155页

作者： shuanglong Yi Linfang wang Margaret s.h. shiping Zhang s.h.ol of Life science and Technology ShanghaiTech UniversityShanghaiChina College of Life sciences University of Chinese Academy of SciencesBeijingChina

Parkinson’s disease is a progressive neurodegenerative disease characterized by motor deficits,dopaminergic neuron loss,and brain accumulation ofα-synuclein aggregates called Lewy *** in protein degradation pathways,such as autophagy,has been demonstrated in neurons as a critical mechanism for eliminating protein aggregates in Parkinson’s ***,it is less well understood how protein aggregates are eliminated in glia,the other cell type in the *** the present study,we show that autophagy-related gene 9(Atg9),the only transmembrane protein in the autophagy machinery,is.h.ghly expressed in Drosophila glia from adult *** from immunostaining and live cell imaging analysis reveal that a portion of Atg9 localizes to the trans-Golgi network,autophagosomes,and lysosomes in ***9 is persistently in contact with these *** glial atg9 reduces the number of omegasomes and autophagosomes,and impairs autophagic substrate *** suggests that glial Atg9 participates in the early steps of autophagy,and hence the control of autophagic ***,loss of glial atg9 induces parkinsonian symptoms in Drosophila including progressive loss of dopaminergic neurons,locomotion deficits,and glial *** findings identify a functional role of Atg9 in glial autophagy and establish a potential link between glial autophagy and Parkinson’s *** results may provide new insights on the underlying mechanism of Parkinson’s disease.

关键词： Atg9 autophagy glia Parkinson’s disease

Cognition on oxidation behavior of Ni-based superalloy Gh4742 when exposed to water vapor

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2024年第7期174卷 15-22页

作者： h.Xu s.F.Yang E.h.wang C.Y.Guo Y.s.Liu X.M.hou Y.L.Zhang state Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China

The oxidation behavior of Ni-based superalloy Gh4742 exposed to water vapor was investigated at 900-1100℃for 50 h in Ar+20%h_(2)O,with Ar+20%O_(2)included for *** presence of h_(2)O is adverse to formation of continuous Cr_(2)O_(3)oxide layer but contributes to generation of big *** on this,Ni^(2+)and Co^(2+)are more easily to diffuse towards the outermost oxide layer(OOL),forming non-protective Ni-and Co-rich oxides with high *** leads to a higher weight gain in Ar+20%h_(2)O than that in Ar+20%O_(2).At elevated temperatures,the spallation of oxide scale occurs while the consumption of Cr is reduced in Ar+20%h_(2)O,and the contents of Ni-and Co-rich oxides at this moment are reduced in the *** oxidation mechanism was also discussed.

关键词： Gh4742 superalloy h_(2)O Diffusion Oxidation Mechanism

search for production of dark fermion candidates in association with heavy neutral gauge boson decaying to dimuon in proton-proton collisions at√s=8 TeV using CMs open data

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第4期48卷 6-13页

作者： Y.Mahmoud h.Abdallah M.T.hussein s.Elgammal Centre for theoretical physics The British University in EgyptEgypt Physics Department Faculty of ScienceCairo UniversityEgypt

In this study,we conducted a search for dark matter using a part of the data recorded by the CMs experiment during run-I of the LhC in 2012 with a center of mass energy of 8 TeV and an integrated luminosity of 11.6 fb−*** data were gathered from the CMs open *** matter,in the framework of the simplified model(mono-Z′),can be produced from proton-proton collisions in association with a new hypothetical gauge boson,Z′.Thus,the search was conducted in the dimuon plus large missing transverse momentum *** benchmark scenario of mono-Z′,which is known as light vector,was used for interpreting the CMs open *** evidence of dark matter was observed,and exclusion limits were set on the masses of dark matter and Z′at 95%confidence level.

关键词： dark matter large hadron collider CMs open data search for new physics dark fermion

Connections Between Induction Generator Effect and Open-loop Modal Proximity to Cause sub-synchronous Oscillations in series-compensated Power system

在线全文

学校读者我要写书评

暂无评论

CsEE Journal of Power and Energy systems 2024年第3期10卷 963-973页

作者： Wenjuan Du Yang wang h.F.wang Tao Zhao Tim Littler College of Electrical Engineering Sichuan UniversityChengduChina s.h.ol of Electrical Engineering the Queen’s University of BelfastBelfastUK IEEE

The induction generator effect(IGE)and the openloop modal proximity(OLMP)are two different reasons why subsynchronous oscillations(ssOs)in a series-compensated power system(sCPs)may *** IGE attributes the growing ssOs to negative resistance,while the OLMP explains the ssO mechanism from the standpoint of modal *** this paper,we investigate the connections between the IGE and the OLMP through equivalent RLC circuit and open-loop modal *** investigation is conducted for two types of seriescompensated power systems where either a synchronous generator or a DFIG is connected at the sending *** investigation reveals the conditions,in which the IGE and the OLMP may jointly cause the growing ssOs,i.e.,both the IGE and the OLMP can explain why the growing ssOs ***,the investigation indicates that the IGE and the OLMP may be totally irrelevant and lead to growing ssOs *** implies that it is possible that in a sCPs,the growing ssOs are only due to the IGE,and the OLMP is non-existent,and vice ***,when the growing ssOs occurs in a sCPs,examination based on both the IGE and the OLMP should be carefully conducted in order to find if the oscillatory instability is due to the IGE,or the OLMP,or both of them.

关键词： Induction generator effect open-loop modal proximity series compensation sub-synchronous oscillations

Atomistic Investigation of shock-Induced Amorphization within Micro-shear Bands in hexagonal Close-Packed Titanium

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2024年第9期37卷 1590-1600页

作者： Z.C.Meng K.G.wang T.Ali D.Li C.G.Bai D.s.Xu s.J.Li A.h.Feng G.J.Cao J.h.Yao Q.B.Fan h.wang R.Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China s.h.ol of Materials science and Engineering University of Science and Technology of ChinaShenyang 110016China Interdisciplinary Centre for Additive Manufacturing(ICAM) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China s.h.ol of Materials science and Engineering Tongji UniversityShanghai 201804China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 210009China National Key Laboratory of science and Technology on Materials Under shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

The mechanical response of a single crystal titanium sample against(0001)α surface impact was investigated using molecular dynamics ***,non-uniform plastic deformation was observed in the *** high strain rates,amorphization occurred near the edge of the contact region where severe shear strain induced a large number of stacking faults(sFs)and *** contrast,the central part of the contact region underwent less deformation with significantly fewer ***,instead of amorphization by consuming sFs and dislocations,there was a gradual increase in the density of dislocations and sFs during the process of *** local amorphous regions eventually grew into shear bands.

关键词： shock compression Amorphization shear band Titanium Molecular dynamics