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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

Influence of Continuous Bending Process on Texture Evolution and Mechanical Properties of AZ31 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 225-233页

作者： Ting-Zhuang Han guang-Sheng Huang Lun Huang Bin Jiang guan-gang wang Ai-Tao Tang Fu-Sheng Pan State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science & Technology

Mg-3Al-lZn alloy sheets have been deformed by continuous bending（CB）to investigate the effects of pro-cessing parameters（bending angle and repetitive passes）on the texture and *** samples exhibited a bimodal microstructure with abnormal growth grains in the surface region and fine grains distributed in the center after CB process followed by *** texture evolution measured by XRD indicated that the basal poles were rotated from ND toward RD,and the texture intensity decreased with the bending angle decreasing and repetitive passes *** with the as-received sample,the yield strength of CBA-120-2 sample significantly decreased from 183 to 112 MPa,and a smaller r-value and a larger n-value were *** formability of CB processed samples in annealing condition was significantly enhanced with the highest of Erichsen value of 5.4 mm,increased by about 135%.The improvement of formability was likely attributed to the weakened and RD-tilt basal texture and coarse grains in the surface part.

关键词： Magnesium alloy Continuous bending Microstructure Texture Stretch formability

Altered Taurine Release in Hypothalamus of Aquaporin-4 Knockout Mice

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Chemical Research in Chinese Universities 2010年第3期26卷 406-408页

作者： ZHANG Hong-guo XIAO Ying-hong YANG Long-fei SU Wei-heng guan Xin-gang wang Yu FENG Xue-chao MA Tong-hui Membrane Channel Research Laboratory Northeast Normal University Changchun 130024 P. R. China

Taurine is concentrated in glial cells in the hypothalamus and released in an osmo-dependent manner through volume-sensitive anion channels. Released tanrine acts on glycine receptors on vasopressin neurons to control vasopressin secretion. Water channel AQP4 is abundant in astrocytes in osmosensory areas such as the supraoptic nucleus of hypothalamus. An HPLC-based method was established to quantify taurine release from isolated hypothalamus tissues in wildtype and AQP4 knockout mice. Under the basal condition, there was no difference in taurine release from AQP4^＋/＋ and AQP4^-/- hypothalamuses. Taurine release from AQP4^-/- hypothalamus under hypoosmotic stimulation was significantly lower than that from AQP4^＋/＋ mice. AQP4 expression in the glial cells of the hypothalamus may play an important role in osmoregulation oftaurine release and subsequent vasopressin secretion.

关键词： Aquaporin-4 Taurine Hypothalamus HPLC Precolumn derivatization

Influence of different rolling routes on mechanical anisotropy and formability of commercially pure titanium sheet

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Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1306-1312页

作者： Ding-kai LIU guang-sheng HUANG Gui-lin GONG guan-gang wang Fu-sheng PAN State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Chongqing Research Center for Advanced Materials Chongqing Academy of Science & Technology Chongqing 401123 China

Influence of three different rolling routes on mechanical anisotropy and formability of commercially pure titanium sheetwas *** A and Route B are unidirectional rolling(UR)where the rolling direction is along initial rolling direction(RD)and transverse direction(TD),*** C is cross rolling(CR)where the rolling direction is changed by90°aftereach rolling *** microstructure and texture,tensile mechanical properties including strength and elongation,and also theanisotropy of the UR and CR sheets were investigated at room *** XRD results indicate that the texture intensity ofrolled samples gradually weakens from Route A to Route *** with Route A and Route B rolled samples,the Route C rolledsamples show a smaller planar *** deep drawing tests reveal that cross rolling can avoid the occurrence of *** tests indicate that rolling routes have an effect on stretch formability of pure titanium sheet.

关键词： CP-Ti cross rolling anisotropy texture deep drawing

Microstructure and formability evolutions of AZ31 magnesium alloy sheets undergoing continuous bending process

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2043-2050页

作者： Ting-zhuang HAN guang-sheng HUANG You-gen wang guan-gang wang Yan-chun ZHAO Fu-sheng PAN State Key Laboratory of Mechanical Transmission School of Materials Science and EngineeringChongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Chongqing Research Center for Advanced Materials Chongqing Academy of Science & TechnologyChongqing 401123 China

Continuous bending (CB) process along rolling direction was performed to improve the formability of AZ31 magnesium alloy sheets. The microstructure and texture evolutions were characterized by optical microscopy (OM) and electronic backscatter diffraction (EBSD). The results reveal that the basal texture intensity of continuously bent and annealed (CBA) sample is drastically weakened. A large number of twins are induced on the concave surface by the 1st pass bending and the density of twins obviously declines during the 2nd pass bending owing to the occurrence of detwinning. Due to the asymmetric tension?compression strain states between the outer and inner regions during V-bending, twinning and detwinning are generated alternatively during the CB process. The Erichsen value is 5.2 mm which increases by 41% compared with that of as-received sample. This obvious improvement of formability can be attributed to the weakened basal texture, which leads to a smaller plastic strain ratio (r-value)together with a larger strain-hardening exponent (n-value).

关键词： AZ31 magnesium alloy continuous bending twinning detwinning microstructure formability

抑制中性鞘磷脂酶-2通路保护脑缺血再灌注大鼠

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国际脑血管病杂志 2018年第6期26卷 444-449页

作者：李刚关鑫磊王喜丰余敏熊雯王岚沈伟武汉市第四医院华中科技大学同济医学院附属普爱医院神经内科430032 武汉市第四医院华中科技大学同济医学院附属普爱医院药剂科430032 江汉大学医学院武汉430056

目的探讨抑制中性鞘磷脂酶-2（neutral sphingomyelinase 2,nSMase2）通路对脑缺血再灌注大鼠脑水肿和脑损伤的影响.方法将76只雄性成年SD大鼠按随机数字表法分为假手术组（n=12）、模型组（n=16）、赋形剂组（n=16）、SB203580[p38... 详细信息

目的探讨抑制中性鞘磷脂酶-2（neutral sphingomyelinase 2,nSMase2）通路对脑缺血再灌注大鼠脑水肿和脑损伤的影响.方法将76只雄性成年SD大鼠按随机数字表法分为假手术组（n=12）、模型组（n=16）、赋形剂组（n=16）、SB203580[p38丝裂原活化蛋白激酶（mitogen activated protein kinase,MAPK）抑制剂]处理组（n=16）和MRS1754[选择性腺苷A2B受体（A2B adenosine receptor,A2BAR）拮抗剂]处理组（n=16）.应用线栓法建立大脑中动脉缺血再灌注模型,赋形剂、SB203580和MRS1754均在模型制作前30 min侧脑室注射.缺血再灌注24 h后进行神经功能评分,2,3,5-三苯四氮唑染色检测脑梗死体积,干湿重法检测脑组织含水量.应用蛋白质印迹分析检测缺血脑组织内nSMase2和p38 MAPK表达,应用免疫组化染色法检测缺血脑组织nSMase2表达.结果 MRS1754可显著降低大鼠神经行为学评分（P〈0.05）和缩小脑梗死体积（P〈0.05）.MRS1754和SB203580均可显著降低缺血脑组织含水量（P均〈0.05）.此外,MRS1754还能显著降低缺血再灌注后p38 MAPK磷酸化水平（P〈0.05）并降低nSMase2表达水平（P〈0.01）.结论调控nSMase上游的A2BAR和p38 MAPK可能在脑缺血再灌注损伤后起到神经保护作用.

关键词：脑缺血再灌注损伤鞘磷脂磷酸二酯酶受体腺苷A2B p38丝裂原激活蛋白激酶神经保护药疾病模型动物大鼠

The evolution of courtship displays in Galliformes

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Avian Research 2022年第1期13卷 11-16页

作者： Xiyuan guan Xiaodong Rao gang Song Daiping wang Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing100101China College of Forestry/Wuzhishan National Long Term Forest Ecosystem Monitoring Research Station Hainan UniversityHaikou570228China Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing100101China

Species in Galliformes have elaborate ritual courtship displays,often including strutting,fluffing of tail or head feathers,and vocal sounds that serve as excellent examples of sexual *** to the male orientation to the female while either posturing or moving,these courtship displays of gallinaceous species can be classified into three categories:1)‘frontal displays’,2)‘lateral displays’,and 3)‘both frontal and lateral displays’.Questions regarding which category of displays is the ancestral state and the evolutionary history of courtship displays in Galliformes remain *** collected and classified 131 species in terms of their courtship displays into the three categories listed above and carried out a large-scale comparative analysis to reveal the evolutionary trajectory of this *** found that the ancestral state of courtship displays of Galliformes involves both relatively short and straightforward frontal and lateral elements(i.e.,the category of‘both frontal and lateral displays’).Furthermore,ancestral trait reconstructions suggest that transitions from‘lateral displays’to‘frontal displays’occurred more frequently than the other way around(i.e.,from‘frontal displays’to‘lateral displays’).In addition,some transitions occurred from‘both frontal and lateral displays’to‘lateral displays’but not from‘both frontal and lateral displays’to‘frontal displays’.Ancestral state reconstruction of courtship displays at the root of the Galliformes phylogeny supports the‘both frontal and lateral displays’first *** original state then evolved towards two extremes,either‘frontal displays’or‘lateral displays’,with more complicated and elaborate display ***,subsequent transitions occurred from‘lateral displays’to‘frontal displays’much more frequently than the other way around during the evolutionary history,indicating positive selection of‘frontal displays’.

关键词： Ancestral state analysis Comparative studies Courtship displays Galliformes Sexual selection Transition rate analysis

Simultaneous determination of 14 active constituents of Shengjiang Xiexin decoction using ultrafast liquid chromatography coupled with electrospray ionization tandem mass spectrometry

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Acta Pharmaceutica Sinica B 2017年第2期7卷 193-201页

作者： gang Peng Huanyu guan Xiaoming wang Yue Shi Institute of Medicinal Plant Development Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100193China

An effective herbal medicinal prescription of Shengjiang Xiexin decoction(SXD) was used in treating the inflammatory bowel disease in *** this study,an ultrafast liquid chromatography-tandem mass spectrometry(UFLC-MS/MS) method was developed to separate and to simultaneously determine14 major active ingredients in *** separation was successfully accomplished on an Acquity BEH C18(100 mm × 2.1 mm,1.7 μm) column using gradient elution with 0.1%(v/v) formic acid water(A) and 0.1%(v/v) formic acid in methanol(B).Negative and positive electrospray ionization tandem mass spectrometry was used to detect the 14 analytes using its selective reaction monitoring(SRM) mode.A good linear regression relationship for each analyte was obtained over the range from3.88 ng/mL to 4080 ng/*** precision was evaluated by intra-and inter-day assays with a relative standard deviation(RSD) of less than 6.25%.The recovery measured at three concentration levels varied from 98.72%to 103.47%.The overall limits of quantification(LOQ) ranged from 2.05 ng/mL to4.72 ng/*** method was successfully implemented in the qualitative and quantitative analyses of the14 chemical constituents in *** results showed that the developed UFLC-MS/MS method was linear and *** method could be used reliably as a quality control method for SXD.

关键词： Inflammatory bowel disease Quality control UFLC–MS/MS Determination Shengjiang Xiexin decoction

A new 3D cupric coordination polymer as chemiresistor humidity sensor:narrow hysteresis,high sensitivity,fast response and recovery

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Science China Chemistry 2017年第9期60卷 1197-1204页

作者： Xiao-Jing Lv Ming-Shui Yao guan-E wang Yan-Zhou Li gang Xu State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences University of Chinese Academy of Sciences Chinese Academy of Sciences

A new three-dimensional coordination polymer composed of Cu2+ centres and semiquinoid linkers (dhbq(2-)) was synthesized which was composed by two independent, enantiomeric, interpenetrated [Cu-2(dhbq)(3)](2-) networks with (10,3)-a topology. The compound has good water stability and typical behaviors of semiconductor, whose conductivity increases along with raising temperature. The chemiresistive humidity sensor made from this material shows good properties including linear sensitivity, high response, fast response and recovery, and particularly narrow hysteresis during humidity adsorption and desorption.

关键词： coordination polymer, chemiresistive humidity sensor, narrow hysteresis, fast response & recovery