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A novel approach to large-scale formation of through-hole porous anodic aluminum template

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Chinese Chemical Letters 2008年第11期19卷 1371-1374页

作者： Ya Nan Zhang Miao Chen Zhi Lu Liu Yan chun zhao State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 PR China Graduate School of Chinese Academy of Sciences Beijing 100039 PR China School of Chemistry and Chemical Engineering of Guangxi Normal University Guangxi 541004 PR China

A novel anodic oxidization equipment was designed to fabricate a large number of porous anodic alumina （PAA） templates in one time. This approach improved the efficiency of the preparation of the PAA templates remar... 详细信息

关键词： Porous anodic alumina template Anodization Large-scale

Novel alternative splicing of GABA receptor RDL exon 9 from Laodelphax striatellus modulates agonist potency

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Insect Science 2021年第3期28卷 757-768页

作者： Jie Jiang Li-Xin Huang Feng Chen Cheng-Wang Sheng Qiu-Tang Huang zhao-Jun Han chun-Qing zhao Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests College of Plant ProtectionNanjing Agricultural UniversityNanjingChina College of Plant Protection Anhui Agricultural UniversityHefeiChina

The resistance to dieldrin gene(RDL)encodes the primary subunit of the insect ionotropic y-aminobutyric acid(GABA)receptor(GABAR),which is the target of phenylpyrazole and isoxazoline *** splice variants in exons 3 and 6 of RDL,which have been widely explored in many insects,modulate the agonist potency of the homomeric RDL GABAR and potentially play an important role in the development of *** the present study,four splice variants of exon 9 were identified in RDL of the small brown planthopper,Laodelphax striatellus(LsRDL),resulting in LsRDL-9sl,LsRDL-92l\LsRDL-9b,and ***-9a has one more amino acid(E,glutamic acid)compared with LsRDL-9a\and LsRDL-9b lacked two amino acids and had seven different amino acids compared with ***-electrode voltage-clamp recording on LsRDLs expressed in Xenopus oocytes showed that alternative splicing of exon 9 has significant impact on LsRDL sensitivity to the agonists GABA and 0-alanine,whereas no significant difference was observed in the potencies of the non-competitive antagonists(NCAs)ethiprole and fluralaner on the splice *** results suggest that alternative splicing of RDL exon 9 broadens functional capabilities of the GABAR in *** by influencing the action of GABA.

关键词： alternative splicing exon 9 GABA receptor Laodelphax striatellus^RDL

Understanding Third Pole Atmospheric Dynamics and Land Surface Processes and Their Associations with the Cryosphere,Air Quality,and Climate Change--Preface to the Special Issue on Third Pole Atmospheric Physics,Chemistry,and Hydrology

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Advances in Atmospheric Sciences 2022年第7期39卷 1017-1020页

作者： Yun Qian Hailong Wang Chuanfeng zhao chun zhao Siyu Chen Xiao-Ming Hu Shichang Kang Pacific Northwest National Laboratory RichlandWA 99354USA College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China Center for Analysis and Prediction of Storms University of OklahomaNorman 73019OKUSA State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China

The Tibetan Plateau(TP),widely known as the Third Pole,is the highest and largest plateau on *** TP not only plays an important role in influencing the atmospheric circulation,surface energy budget,ecology,weather,and climate but also acts as the Asian Water Tower by holding the largest ice mass outside the polar regions to supply fresh water to over 1.4 billion people downstream in Asia(Qin et al.,2006).The observed historical warming and projected future warming over the TP are much stronger than the corresponding global average(Wang et al.,2008).Glaciers on the TP have been retreating extensively in recent decades,driven by atmospheric warming and circulation changes associated with increasing concentrations of greenhouse gases and aerosols in the atmosphere,light-absorbing particles(e.g.,black carbon,dust)on snow,and other factors(Duan et al.,2012;Qian et al.,2011;zhao et al.,2020).In addition,due to the thermal and dynam-ical effects of the TP,as well as its proximity to the stratosphere,unique atmospheric boundary layer structures often develop over the TP and in the surrounding areas,which have important impacts on local weather,climate,and mixing and transport of atmospheric constituents(zhao et al.,2020).The TP is considered a natural laboratory to study multi-sphere inter-actions.A systematic mechanistic understanding of the atmospheric chemical and microphysical processes,climate change,cryospheric variability,and the subsequent environmental impacts is particularly important in the context of the unpreceden-ted warming over the TP(Yao et al.,2019).

关键词： warming weather plateau

SERS Study of Co-doped TiO2 Nanoparticles

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Chemical Research in Chinese Universities 2013年第4期29卷 751-754页

作者： XUE Xiang-xin JI Wei MAO Zhu LI Zhi-shi GUO Zhi-nan zhao Bing zhao chun State Key Laboratory of Supramolecular Structure and Materials Joint State Key Laboratory on Integrated Optoelectronics Jilin University Changchun 130012 P. R. China

Single-phase Co-doped TiO2（CoxZil_xO2） nanoparticles（NPs） synthesized via a simple sol-hydrothermal me- thod were used as surface-enhanced Raman scattering（SERS） substrates. Interestingly, it was found that SERS signals were enhanced greatly compared to those of pure TiO2 nanoparticles when an amount of Co2＋ ions were doped into the TiO2 lattice. Detailed results clearly show that Co element as Co2＋ was incorporated into the TiO2 lattice and the defects were created due to the substitution of Coz＋ ions for the Ti4＋ ions. The Co2＋ doping increases the defect concentration of CoxTil_xO2 NPs. An amount of defects is beneficial to the charge-transfer so as to increase the SERS activities. A possi- ble mechanism of charge-transfer from CoxTi1-xO2 NPs to molecules was then briefly discussed.

关键词： TiO2 Dope Defect Surface-enhanced Raman scattering Charge-transfer

Influence of Grain Orientation on the Corrosion Behavior of Rolled AZ31 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1387-1393页

作者： Yan-chun zhao Guang-Sheng Huang Guan-Gang Wang Ting-Zhuang Han Fu-Sheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science and Technology

The effect of the grain orientation on corrosion behavior of rolled AZ31 magnesium alloy is investigated in this study. The test samples have a similar surface roughness to the Mg alloy in practical application. The immersion test and electrochemical impedance spectroscopy show that the TD-ND planes dominated by （101-0）, （1120） and （1011） oriented grains show a higher corrosion resistance compared with these of the RD-TD planes which consist mainly of （0001） oriented grains. Here, RD, ND and TD represent the rolling direction, the normal direction and the transverse direction of the alloy sheet, respectively. The surface morphologies of the alloys at various immersion stages are observed by scanning electron microscopy, and the surface topography of the alloy substitutes is also observed by laser scanning confocal microscopy. The TD-ND planes show a regular corrosion along the TD direction, but the RD-TD plane shows an irregular corrosion.

关键词： Magnesium alloys Corrosion behavior Electrochemical impedance spectroscopy Crystallographic orientation

Dynamic Compressive Property of Closed-Cell Mg Alloy Composite Foams Reinforced with SiC Particles

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Acta Metallurgica Sinica(English Letters) 2019年第11期32卷 1320-1328页

作者： Wen-Zhan Huang Hong-Jie Luo Yong-Liang Mu Jian-Rong Xu Ai-chun zhao School of Metallurgy Northeastern UniversityShenyang 110819China Engineering Research Center of Ministry of Education for Advanced Materials Preparation Technology Shenyang 110819China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

The high-strain-rate mechanical response of Mg alloy/SiC_p composite foams has received increased attention in recent years due to their light weight and potential to absorb large amounts of energy during deformation. Dynamic compressive properties of closed-cell Mg alloy/SiC_p composite foams with diff erent relative densities(0.162, 0.227 and 0.351) and diff erent SiC_p additions(0, 4 and 8 wt%) have been investigated using Split-Hopkinson pressure bar. It is shown that peak stress and energy absorption capacity signifi cantly increase as the relative density increases at the range of testing strain rates. Peak stress and energy absorption display strain rate dependence. The peak stress of specimens with 0 wt% and 4 wt% SiC particles additions grows with increasing strain rate. Meanwhile, the increment in the peak stress of specimens with 8 wt% addition is not signifi cant with strain rate increasing. The increase in strain rate increases the energy absorption capacity. The suitable amount of SiC particles addition has great advantages over increasing the peak stress and energy absorption capacity at the high strain rate. The strain-rate-sensitive matrix, cell morphology, morphological defects and gas pressure have an impact on the strain-rate sensitivity of Mg alloy/SiC_p composite foams.

关键词： Mg alloy SiC particles Mg alloy/SiC_p composite foam Split-Hopkinson pressure bar system(SHPB) Dynamic compressive

Achieving strength-ductility synergy in novel paramagnetic Fe-based medium-entropy alloys through deep cryogenic deformation

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Rare Metals 2024年第9期43卷 4493-4507页

作者： Hu-Wen Ma Yan-chun zhao Li Feng Tian-Zeng Liu Zhi-Qi Yu Bo Jin Wang-chun Duan Peter K.Liaw Dong Ma State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Wenzhou Pump and Valve Engineering Research Institute Lanzhou University of TechnologyWenzhou 325105China Iron and Steel Research Institute Jiuquan Iron and Steel CorporationJiayuguan 735100China Lanzhou Resources and Environment Voc-Tech University Lanzhou 730123China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA Neutron Science Center Songshan Lake Materials LaboratoryDongguan 523808China

Cryogenic pre-deformation treatment has been widely used to effectively improve the comprehensive mechanical properties of steels and novel ***,the dislocation evolution and phase transformation induced by different degrees of deep cryogenic deformation are not yet fully *** this study,the effects of multiple cryogenic pre-treatments on the mechanical properties and deformation mechanisms of a paramagnetic Fe_(63.3)Mn_(14-)Si_(9.1)Cr_(9.8)C_(3.8)medium-entropy alloy(MEA)were investigated,leading to the discovery of a pretreated MEA that exhibits exceptional mechanical properties,including a fracture strength of 3.0 GPa,plastic strain of 26.1%and work-hardening index of *** addition,X-ray diffraction(XRD)and transmission electron microscopy(TEM)analyses revealed that multiple cryogenic pre-deformation treatments significantly increased the dislocation density of the MEA(from 9×10^(15)to 4×10^(16)m^(-2)after three pretreatments),along with a transition in the dislocation type from predominantly edge dislocations to mixed dislocations(including screw-and edge-type dislocations).Notably,this pretreated MEA retained its paramagnetic properties(μ_(r)<1.0200)even after *** calculations showed that cryogenic pretreatment can significantly reduce the stacking fault energy of the MEA by a factor of approximately four(i.e.,from 9.7 to2.6 m J·m^(-2)),thereby activating the synergistic effects of transformation-induced plasticity,twinning-induced plasticity and dislocation strengthening *** synergistic effects lead to simultaneous strength and ductility enhancement of the MEA.

关键词： Deep cryogenic transformation Iron-based medium-entropy alloys Dislocation evolution Phase transformation Stacking fault energy

Fatigue Damage Mechanism of Oil Film Bearing Sleeve

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Journal of Iron and Steel Research International 2007年第1期14卷 60-63,68页

作者： HUANG Qing-xue WANG Jian-mei MA Li-feng zhao chun-jiang School of Mechanical and Electrical Engineering Taiyuan University of Science and Technology Taiyuan 030024 Shanxi China School of Mechanical Design and Automation Taiyuan University of Technology Taiyuan 030024 Shanxi China

With the rapid development of the steel industry, to keep pace with the current trend of high speed, continuous, and large-scale production that focuses on automation and high levels of efficiency, many state-owned steel companies are being equipped with oil film bearings. Through long-term on-spot inspection and research on the fatigue failure of oil film bearing, three segments of annulated fatigue breakage were found axially along the inner surface of the bearing sleeve. In order to elucidate the reason for the three-segment annulated damage under rolling load, numerical boundary element method was adopted to analyze the contact behaviors between the sleeve and rollneck. Failure mechanism was discussed in detail, the distributions of contact stress were analyzed, and the service lives of the sleeve for different positions on the inner surface were quantitatively described, which provided an effective means to decrease wear and adhesive damage of the sleeve and to increase the load capacity of oil film bearing and its service life as well.

关键词： oil film bearing fatigue failure analysis contact problem bearing life

A near-infrared fluorescent probe for monitoring fluvastatin-stimulated endogenous H_2S production

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Chinese Chemical Letters 2017年第2期28卷 218-221页

作者： Li-Li Zhang Hui-Kun Zhu chun-Chang zhao Xian-Feng Gu Key Laboratory for Advanced Materials and Institute of Fine Chemicals East China University of Science and Technology Department of Medicinal Chemistry School of Pharmacy Fudan University

Most reported fluorescent probes have limitations in practical applications in living systems due to the strong autofluorescence background,construction of probes with near-infrared（NIR） fluorescence emission is an accessible approach for addressing this *** here designed a NIR fluorescent probe for monitoring the endogenous production of H2S in living *** designed probe showed significant NIR fluorescence turn-on response to H2S with high selectivity,enabling the sensitive detection ***,the probe could be applied in monitoring the endogenous production of H2S in raw 264.7 *** study showed that fluvastatin can promote the activity of cystathionineγ-lyase（CSE） for generation H2S.

关键词： Fluorescent probe Near-infrared fluorescence emission Endogenous H2S detection Fluvastatin