期刊文献+
共找到101篇文章
< 1 2 6 >
每页显示 20 50 100
Disturbed Yin-Yang balance:stress increases the susceptibility to primary and recurrent infections of herpes simplex virus type 1 被引量:14
1
作者 Chang Yan Zhuo Luo +5 位作者 Wen Li Xue Li Robert Dallmann Hiroshi Kurihara Yi-Fang Li Rong-Rong He 《Acta Pharmaceutica Sinica B》 SCIE CAS CSCD 2020年第3期383-398,共16页
Herpes simplex virus type 1(HSV-1),a neurotropic herpes virus,is able to establish a lifelong latent infection in the human host.Following primary replication in mucosal epithelial cells,the virus can enter sensory ne... Herpes simplex virus type 1(HSV-1),a neurotropic herpes virus,is able to establish a lifelong latent infection in the human host.Following primary replication in mucosal epithelial cells,the virus can enter sensory neurons innervating peripheral tissues via nerve termini.The viral genome is then transported to the nucleus where it can be maintained without producing infectious progeny,and thus latency is established in the cell.Yin-Yang balance is an essential concept in traditional Chinese medicine(TCM)theory.Yin represents stable and inhibitory factors,and Yang represents the active and aggressive factors.When the organism is exposed to stress,especially psychological stress caused by emotional stimulation,the Yin-Yang balance is disturbed and the virus can re-engage in productive replication,resulting in recurrent diseases.Therefore,a better understanding of the stress-induced susceptibility to HSV-1 primary infection and reactivation is needed and will provide helpful insights into the effective control and treatment of HSV-1.Here we reviewed the recent advances in the studies of HSV-1 susceptibility,latency and reactivation.We included mechanisms involved in primary infection and the regulation of latency and described how stress-induced changes increase the susceptibility to primary and recurrent infections. 展开更多
关键词 HERPES SIMPLEX virus type 1 HSV-1 susceptibility Latency REACTIVATION stress
原文传递
玉米应力裂纹率和破碎敏感性的关系 被引量:11
2
作者 朱文学 曹崇文 《农业机械学报》 EI CAS CSCD 北大核心 1998年第3期69-72,共4页
在分析玉米应力裂纹指数(S)计算方法的基础上,得到了修正应力裂纹指数(S*)方程,方程中的完善籽粒、单裂籽粒、双裂籽粒、龟裂籽粒的平均权重分别为0.75、1、1.18、1.36。比较了应力裂纹指数和修正应力裂纹指数与... 在分析玉米应力裂纹指数(S)计算方法的基础上,得到了修正应力裂纹指数(S*)方程,方程中的完善籽粒、单裂籽粒、双裂籽粒、龟裂籽粒的平均权重分别为0.75、1、1.18、1.36。比较了应力裂纹指数和修正应力裂纹指数与破碎敏感性(B)之间的关系。修正后的应力裂纹指数与破碎敏感性拟合得更好,更反映干后谷物破碎强度的变化。 展开更多
关键词 玉米 应力裂纹 破碎敏感性 干燥
下载PDF
等效应力磁场与残余应力测试 被引量:8
3
作者 赵维义 喻力华 邹畹珍 《华中理工大学学报》 CSCD 北大核心 1999年第12期98-99,共2页
基于磁各向异性的磁法应力测试技术,给出了存在应力影响的材料磁导率与应力之间的一个简单表达式,用此式由所测得的电桥非平衡电流Ig 及测试电路和探头结构参数,可求出测点的残余应力.在单向应力作用下得到了实验证明。
关键词 等效应力磁场 残余应力 磁导率 测试 应力
下载PDF
Effects of Y on hot tearing susceptibility of Mg-Zn-Y-Zr alloys 被引量:9
4
作者 刘正 张斯博 +1 位作者 毛萍莉 王峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第4期907-914,共8页
The hot tearing susceptibility of MgZn2.5YxZr0.5 (x=0.5, 1, 2, 4, 6) alloys was evaluated by thermodynamic calculations based on Clyne-Davies model. The microstructure and morphology of hot tearing regions of the al... The hot tearing susceptibility of MgZn2.5YxZr0.5 (x=0.5, 1, 2, 4, 6) alloys was evaluated by thermodynamic calculations based on Clyne-Davies model. The microstructure and morphology of hot tearing regions of the alloys were observed by X-ray diffraction and scanning electron microscopy. The solidification temperature and shrinkage stress during the solidification of MgZn2.5YxZr0.5 alloys in the“T”type hot tearing permanent-mold were acquired with the attached computer. The effect factors of hot tearing susceptibility of MgZn2.5YxZr0.5 alloys, such as the solidification temperature interval, the variation of solid fraction in vulnerable region, the residual liquid fraction in the final stage, the type of the second phase of the alloys were discussed based on the above calculation and observation. The results demonstrated that the hot tearing susceptibility in the investigated alloys was found as follows:MgZn2.5Y2Zr0.5&gt;MgZn2.5Y0.5Zr0.5&gt;MgZn2.5Y4Zr0.5&gt;MgZn2.5Y6Zr0.5&gt;MgZn2.5Y1Zr0.5. The highest hot tearing susceptibility of MgZn2.5Y2Zr0.5 alloy related to the following reasons: the largest freezing range, the biggest changing of the variation of solid fraction in vulnerable region, the least liquid film in the final stage of solidification, the formation of the second phase which worsens the liquid flow and interdendritic feeding after dendrite coherency. 展开更多
关键词 Mg-Zn-Y-Zr alloys solidification curve shrinkage stress hot tearing susceptibility
下载PDF
镁合金应力腐蚀机理及其影响因素分析 被引量:5
5
作者 许越 李家学 李莎 《材料科学与工艺》 EI CAS CSCD 北大核心 2008年第3期314-318,共5页
对近期国内外有关镁合金应力腐蚀的测试以及机理研究结果进行了分析,从腐蚀过程及动力学特征的双重角度分析了单纯电化学模式的不合理性,阐述了"化学引发-机械断裂","氢致开裂-机械断裂"两段式理论的主要观点.对影... 对近期国内外有关镁合金应力腐蚀的测试以及机理研究结果进行了分析,从腐蚀过程及动力学特征的双重角度分析了单纯电化学模式的不合理性,阐述了"化学引发-机械断裂","氢致开裂-机械断裂"两段式理论的主要观点.对影响镁合金应力腐蚀敏感性及可能导致其应力腐蚀开裂的各项因素进行了综合性讨论.指出了应力腐蚀机理研究亟待解决和应注意的问题. 展开更多
关键词 镁合金 应力腐蚀 裂纹扩展机理 敏感性 影响因素
下载PDF
Dip2a regulates stress susceptibility in the basolateral amygdala
6
作者 Jing Li Zixuan He +4 位作者 Weitai Chai Meng Tian Huali Yu Xiaoxiao He Xiaojuan Zhu 《Neural Regeneration Research》 SCIE CAS 2025年第6期1735-1748,共14页
Dysregulation of neurotransmitter metabolism in the central nervous system contributes to mood disorders such as depression, anxiety, and post–traumatic stress disorder. Monoamines and amino acids are important types... Dysregulation of neurotransmitter metabolism in the central nervous system contributes to mood disorders such as depression, anxiety, and post–traumatic stress disorder. Monoamines and amino acids are important types of neurotransmitters. Our previous results have shown that disco-interacting protein 2 homolog A(Dip2a) knockout mice exhibit brain development disorders and abnormal amino acid metabolism in serum. This suggests that DIP2A is involved in the metabolism of amino acid–associated neurotransmitters. Therefore, we performed targeted neurotransmitter metabolomics analysis and found that Dip2a deficiency caused abnormal metabolism of tryptophan and thyroxine in the basolateral amygdala and medial prefrontal cortex. In addition, acute restraint stress induced a decrease in 5-hydroxytryptamine in the basolateral amygdala. Additionally, Dip2a was abundantly expressed in excitatory neurons of the basolateral amygdala, and deletion of Dip2a in these neurons resulted in hopelessness-like behavior in the tail suspension test. Altogether, these findings demonstrate that DIP2A in the basolateral amygdala may be involved in the regulation of stress susceptibility. This provides critical evidence implicating a role of DIP2A in affective disorders. 展开更多
关键词 5-HYDROXYTRYPTAMINE acute restraint stress basolateral amygdala CaMKII neurons DIP2A metabolomics NEUROTRANSMITTERS principal component analysis stress susceptibility TRYPTOPHAN
Correspondence between Susceptibility to SCC of 7050 Aluminum Alloy and Passive Film-induced Stress at Various pH Values 被引量:4
7
作者 祁星 宋仁国 +4 位作者 QI Wenjuan JIN Jirong WANG Chao LI Hai SUN Bin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第1期173-178,共6页
The passive film-induced stress and the susceptibility to SCC of 7050 aluminum alloy in 3.5%sodium chloride solution at various pH values were investigated by slow strain rate testing(SSRT) and flowing stress differ... The passive film-induced stress and the susceptibility to SCC of 7050 aluminum alloy in 3.5%sodium chloride solution at various pH values were investigated by slow strain rate testing(SSRT) and flowing stress differential method.The results showed that the passive film-induced stress and the susceptibility to SCC decreased with increasing pH values when pH≤7,while they increased with increasing pH values when pH7.However,the corrosion type was interpreted as exfoliation corrosion when pH=l and 14,and there was no film formed on the surface of the specimens.The whole variation plots of film-induced stress and the SCC susceptibility with pH values were both presented as a valley shape.The symbol and amount of the film-induced stress were related to the compositions of the passive film,which were analyzed using X-ray photoelectron spectroscopy(XPS). 展开更多
关键词 7050 aluminum alloy susceptibility to SCC pH value passive film-induced stress
下载PDF
应激敏感与应激抵抗大鼠粪便代谢组学研究 被引量:2
8
作者 王森岩 卫拂晓 +3 位作者 刘欢乐 赵思俊 秦雪梅 刘晓节 《药学学报》 CAS CSCD 北大核心 2022年第5期1411-1419,共9页
应用核磁代谢组学技术表征应激敏感大鼠和应激抵抗大鼠的粪便代谢轮廓,明确应激敏感和应激抵抗的生物标志物及代谢通路的异同,阐释相同应激下机体不同反应的发生机制。首先,复制慢性不可预知温和刺激(chronic unpredictable mild stress... 应用核磁代谢组学技术表征应激敏感大鼠和应激抵抗大鼠的粪便代谢轮廓,明确应激敏感和应激抵抗的生物标志物及代谢通路的异同,阐释相同应激下机体不同反应的发生机制。首先,复制慢性不可预知温和刺激(chronic unpredictable mild stress,CUMS)大鼠抑郁模型;根据大鼠的粪便代谢组学轮廓将模型大鼠分为应激敏感大鼠和应激抵抗大鼠;其次,基于糖水偏爱率验证应激敏感大鼠和应激抵抗大鼠的抑郁状况;最后,应用多元统计分析明确应激敏感大鼠和应激抵抗大鼠粪便的生物标志物及相关代谢通路,阐明其机制。结果表明:与空白组相比,应激敏感大鼠的糖水偏爱率显著降低,而应激抵抗大鼠的糖水偏爱率未发生显著变化。代谢组学研究结果发现,应激敏感和应激抵抗具有相同和特异的差异代谢物和代谢途径。3条代谢途径与应激敏感显著相关,包括牛磺酸和亚牛磺酸代谢,丙氨酸、天门冬氨酸和谷氨酸代谢以及精氨酸和脯氨酸代谢。甘油酯代谢和色氨酸代谢是应激抵抗的特异性代谢通路。本研究从代谢组学角度探讨了相同刺激下,机体出现敏感和抵抗两种不同状态的机制,为抑郁症的研究提供了新视角,亦为临床个体化和精准治疗以及抗抑郁药物的研发提供了新思路。 展开更多
关键词 抑郁症 慢性不可预知温和刺激 应激敏感 应激抵抗 糖水偏爱率 粪便代谢组学
原文传递
一种利用矫顽点微分磁化率定量评估取向电工钢片机械应力的新方法
9
作者 孟肖戈 李琳 《电工技术学报》 EI CSCD 北大核心 2023年第7期1705-1712,共8页
不同大小的应力会对取向电工钢片的磁化及损耗特性产生不同影响,定量评估取向电工钢片的应力大小对减小铁心损耗,提高电气设备的运行效率具有重要意义。该文提出一种利用磁滞回线在矫顽点的微分磁化率来检测电工钢片应力的新方法。首先... 不同大小的应力会对取向电工钢片的磁化及损耗特性产生不同影响,定量评估取向电工钢片的应力大小对减小铁心损耗,提高电气设备的运行效率具有重要意义。该文提出一种利用磁滞回线在矫顽点的微分磁化率来检测电工钢片应力的新方法。首先基于扩展的磁力学磁滞模型推导出了矫顽点微分磁化率的倒数与应力的线性关系表达式,给出了一条可以用来定量评估应力的线性校准曲线。然后为验证理论公式的正确性和适应性,测量了两种不同型号的取向电工钢片在承受不同大小弹性拉应力和压应力时的矫顽点微分磁化率。实验结果与理论计算结果有很好的一致性,这为定量评估取向电工钢片的机械应力提供了一种简单实用的方法。 展开更多
关键词 取向电工钢片 应力评估 磁滞模型 微分磁化率
下载PDF
外加电位条件下7A52铝合金应力腐蚀开裂敏感性研究 被引量:4
10
作者 赵军军 张平 +1 位作者 李奇 原津萍 《装甲兵工程学院学报》 2011年第5期84-87,共4页
摘要:采用电化学极化手段和慢应变速率拉伸试验,结合扫描电镜观察合金断口形貌,研究了外加电位对7A52铝合金应力腐蚀开裂敏感性的影响。研究结果表明:合金在3.5%NaCl溶液中的应力腐蚀开裂敏感性与外加电位有强烈的相关性,开裂敏... 摘要:采用电化学极化手段和慢应变速率拉伸试验,结合扫描电镜观察合金断口形貌,研究了外加电位对7A52铝合金应力腐蚀开裂敏感性的影响。研究结果表明:合金在3.5%NaCl溶液中的应力腐蚀开裂敏感性与外加电位有强烈的相关性,开裂敏感性在外加电位为一0.95V时最低,外加电位起到阴极保护的作用;在外加电位为一1V时有所升高,但仍然低于开路电位条件下的敏感性;在一1.1V时最高,应力腐蚀过程以氢脆为主;在一1.2V时又有所降低,阴极析出的氢以气态逸出而降低应力腐蚀开裂敏感性。 展开更多
关键词 7A52铝合金 外加电位 应力腐蚀 敏感性
原文传递
产后抑郁模型构建及母婴分离对产后抑郁症影响的研究进展
11
作者 周麟 吴作天 +2 位作者 王高华 肖玲 王惠玲 《武汉大学学报(医学版)》 CAS 2023年第8期1023-1026,共4页
产后抑郁症是一种常见的产褥期精神障碍,严重威胁孕产妇的健康。长时间的母婴分离会加剧母代的应激易感性,造成产后抑郁症的高发,而短暂母婴分离可产生抵抗作用,提示哺乳期不同的母婴分离范式对防治产后抑郁症具有指导意义。因此,本文... 产后抑郁症是一种常见的产褥期精神障碍,严重威胁孕产妇的健康。长时间的母婴分离会加剧母代的应激易感性,造成产后抑郁症的高发,而短暂母婴分离可产生抵抗作用,提示哺乳期不同的母婴分离范式对防治产后抑郁症具有指导意义。因此,本文就国内外关于产后抑郁症模型以及母婴分离对母代行为改变方面的基础及临床研究的成果进行综述,为产后抑郁症的防治提出新的思路。 展开更多
关键词 产后抑郁症 母婴分离 应激易感性
原文传递
高校学生危机事件创伤的易感因素分析 被引量:3
12
作者 张磊 《安顺学院学报》 2009年第6期31-33,共3页
文章结合高校校园生活的具体特征,以人为本,研究高校学生危机事件创伤的易感因素,以此来划定危机事件的创伤群体,为实施心理危机干预,解决危机事件带给学生的严重心理应激创伤打下坚实的基础。
关键词 危机事件 创伤 易感因素
下载PDF
清热消炎宁胶囊降低HSV-1易感性的清肝泻火作用及机制研究 被引量:3
13
作者 欧阳淑桦 王小花 +6 位作者 李文 罗卓 彭红英 江涛 李怡芳 栗原博 何蓉蓉 《中国中药杂志》 CAS CSCD 北大核心 2021年第16期4208-4213,共6页
该研究采用情志应激诱导1型单纯疱疹病毒(herpes simplex virus type 1,HSV-1)易感模型模拟"肝郁化火"的状态,研究清热消炎宁(Qingre Xiaoyanning,QX)胶囊的清肝泻火作用。将雄性BALB/c小鼠分为正常对照组,HSV-1组,拘束应激+H... 该研究采用情志应激诱导1型单纯疱疹病毒(herpes simplex virus type 1,HSV-1)易感模型模拟"肝郁化火"的状态,研究清热消炎宁(Qingre Xiaoyanning,QX)胶囊的清肝泻火作用。将雄性BALB/c小鼠分为正常对照组,HSV-1组,拘束应激+HSV-1组,QX低剂量组(0.658 g·kg^(-1)),QX高剂量组(1.316 g·kg^(-1))和阳性药(阿昔洛韦)组,除正常组和HSV-1组外,其他组小鼠在给药的第3天开始每天拘束6 h,在给药的第9天,除正常组外其他组小鼠滴鼻感染HSV-1,从感染病毒后开始连续观察14 d,记录小鼠体质量变化情况、存活时间、脑炎症状和眼部损伤情况。应用苏木素-伊红染色和免疫组化实验方法检测小鼠脑组织切片病理学变化和HSV-1抗原分布情况;应用空斑法检测小鼠脑组织HSV-1病毒滴度;应用Western blot检测小鼠脑组织中HSV-1相关病毒蛋白ICP27表达水平。实验结果显示,QX能够提高情志应激负荷HSV-1感染小鼠的生存率(P<0.001),降低脑组织中的HSV-1病毒滴度(P<0.01),缓解小鼠脑部炎症(P<0.05)及眼部损伤情况(P<0.05),下调HSV-1相关蛋白ICP27的表达(P<0.05),同时降低脑组织HSV-1抗原分布。上述研究结果表明,QX能够降低情志应激诱导HSV-1易感性,可为HSV-1感染的治疗和预防提供理论依据,推动清肝泻火中药的临床开发及应用。 展开更多
关键词 情志应激 肝郁化火 1型疱疹病毒 易感性 清热消炎宁胶囊
原文传递
凡纳滨对虾兰尼定受体基因单核苷酸多态性与对温度变化敏感性的关联分析 被引量:3
14
作者 曾地刚 马宁 谢达祥 《江西农业学报》 CAS 2014年第1期89-91,共3页
用直接测序法检测凡纳滨对虾兰尼定受体基因的单核苷酸多态性(SNP)位点,结果发现了1个SNP位点。通过进行凡纳滨对虾温度变化刺激的实验,把192尾对虾分为应激敏感组和应激抵抗组,用PCR产物直接测序法检测各对虾样品兰尼定受体基因的SNP... 用直接测序法检测凡纳滨对虾兰尼定受体基因的单核苷酸多态性(SNP)位点,结果发现了1个SNP位点。通过进行凡纳滨对虾温度变化刺激的实验,把192尾对虾分为应激敏感组和应激抵抗组,用PCR产物直接测序法检测各对虾样品兰尼定受体基因的SNP的基因型。结果发现,应激敏感组和应激抵抗组的SNP等位基因频率差异显著(P<0.01)。结果显示兰尼定受体基因单核苷酸多态性与凡纳滨对虾对温度变化敏感性关联。 展开更多
关键词 凡纳滨对虾 兰尼定受体基因 单核苷酸多态性 应激敏感性
下载PDF
母子隔离应激增加幼鼠海马CA1区锥体神经元的兴奋性 被引量:3
15
作者 周浩 刘烨 +2 位作者 梁锦平 陈恒胜 邵建玲 《第三军医大学学报》 CAS CSCD 北大核心 2010年第13期1442-1445,共4页
目的初步探讨母子隔离应激对幼鼠海马CA1区锥体神经元自发性放电特征和海马GABAA受体α1亚单位表达的影响及其与癫痫易感性的关系。方法 54只新生的SD大鼠幼鼠用于实验,雌雄不拘,随机分成3组(n=18),正常组(正常喂养,每天不用隔离)、隔离... 目的初步探讨母子隔离应激对幼鼠海马CA1区锥体神经元自发性放电特征和海马GABAA受体α1亚单位表达的影响及其与癫痫易感性的关系。方法 54只新生的SD大鼠幼鼠用于实验,雌雄不拘,随机分成3组(n=18),正常组(正常喂养,每天不用隔离)、隔离15min组、隔离3h组。在生后16d,3组幼鼠分别行氯化锂-匹罗卡品诱导的惊厥实验,全细胞膜片钳检测海马CA1区锥体神经元自发性放电特征,灌注取脑免疫组化检测海马GABAA受体α1亚单位表达情况。结果隔离3h组体质量(24.60±1.89)g与正常组体质量(29.44±2.03)g比较明显减轻(P<0.05)、幼鼠诱发惊厥的潜伏期隔离3h组(11.50±2.10)min短于正常组(15.32±1.34)min(P<0.05)、海马CA1区锥体神经元自发性放电频率隔离3h组(3.64±2.84)Hz要明显快于正常组(1.15±0.69)Hz(P<0.01)、海马CA1区GABAA受体α1亚单位累计化学光密度,隔离3h组(161.10±5.70)少于正常组(175.40±7.20)(P<0.01)。隔离15min组幼鼠体质量(29.34±1.85)g、诱发惊厥的潜伏期(16.47±1.73)min、海马CA1锥体神经元自发性放电频率(1.36±0.83)Hz、海马CA1区GABAA受体α1亚单位累计化学光密度(171.50±6.80),在以上几方面隔离15min组和正常组比较均无统计学差异(P>0.05)。结论早期母子隔离3h的应激对幼鼠生长发育、癫痫易感性产生不良影响,海马CA1锥体神经元兴奋性增加、GABAA受体α1亚单位表达减少可能作为其潜在的病理机制之一。 展开更多
关键词 应激 海马 惊厥 易感性 GABAAα1
下载PDF
Longevity of animals under reactive oxygen species stress and disease susceptibility due to global warming
16
作者 Biswaranjan Paital Sumana Kumari Panda +4 位作者 Akshaya Kumar Hati Bobllina Mohanty Manoj Kumar Mohapatra Shyama Kanungo Gagan Bihari Nityananda Chainy 《World Journal of Biological Chemistry》 CAS 2016年第1期110-127,共18页
The world is projected to experience an approximate doubling of atmospheric CO_2 concentration in the next decades. Rise in atmospheric CO_2 level as one of the most important reasons is expected to contribute to rais... The world is projected to experience an approximate doubling of atmospheric CO_2 concentration in the next decades. Rise in atmospheric CO_2 level as one of the most important reasons is expected to contribute to raise the mean global temperature 1.4 ℃-5.8 ℃ by that time. A survey from 128 countries speculates that global warming is primarily due to increase in atmospheric CO_2 level that is produced mainly by anthropogenic activities. Exposure of animals to high environmental temperatures is mostly accompanied by unwanted acceleration of certain biochemical pathways in their cells. One of such examples is augmentation in generation of reactive oxygen species(ROS) and subsequent increase in oxidation of lipids, proteins and nucleic acids by ROS. Increase in oxidation of biomolecules leads to a state called as oxidative stress(OS). Finally, the increase in OS condition induces abnormality in physiology of animals under elevated temperature. Exposure of animals to rise in habitat temperature is found to boost the metabolism of animals and a very strong and positive correlation exists between metabolism and levels of ROS and OS. Continuous induction of OS is negatively correlated with survivability and longevity and positively correlated with ageing in animals. Thus, it can be predicted that continuous exposure of animals to acute or gradual rise in habitat temperature due to global warming may induce OS, reduced survivability and longevity in animals in general and poikilotherms in particular. A positive correlation between metabolism and temperature in general and altered O_2 consumption at elevated temperature in particular could also increase the risk of experiencing OS in homeotherms. Effects of global warming on longevity of animals through increased risk of protein misfolding and disease susceptibility due to OS as the cause or effects or both also cannot be ignored. Therefore, understanding the physiological impacts of global warming in relation to longevity of animals will become very crucial challenge 展开更多
关键词 Reactive oxygen species Redox regulation Oxidative stress SURVIVABILITY Climate change Disease susceptibility Global WARMING LONGEVITY Thermal stress
下载PDF
Susceptibility to Hot Cracking and Weldment Heat Treatment of Haynes 230 Superalloy 被引量:1
17
作者 I.K.Lee 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2006年第5期685-690,共6页
This study investigates the susceptibility of hot cracking and weldment heat treatment of Haynes 230 superalloy. The Varestriant test was conducted to evaluate this susceptibility. Welding was performed by gas tungste... This study investigates the susceptibility of hot cracking and weldment heat treatment of Haynes 230 superalloy. The Varestriant test was conducted to evaluate this susceptibility. Welding was performed by gas tungsten arc welding (GTAW) and plasma arc welding (PAW) with stress relief heat treatment and solid solution heat treatment. A tensile test is then performed to measure the changes in the mechanical properties of the heattreated material. The results indicate that the number of thermal cycles does not affect the susceptibility of Haynes 230 superalloy to hot cracking. However, it does increase the strain. In weldment of heat treatment, stress relief annealing increases the yield strength and tensile strength of the welded parts. The section of the tensile specimens shows fibrous fractures on the welded parts, regardless of whether they are heat-treated. 展开更多
关键词 Haynes 230 super alloy Varestriant test Hot cracking susceptibility stress relief annealing
下载PDF
氧化应激相关基因多态性与突发性聋的研究进展 被引量:2
18
作者 龙梦琦 冯永 吴学文 《中华耳科学杂志》 CSCD 北大核心 2020年第2期358-362,共5页
氧化应激反应在突发性聋(简称突聋)的发生、发展过程中起重要作用。越来越多的研究表明突聋的发生可能与遗传因素密切相关,基因多态性与突聋之间的相关性研究成为近年来的研究热点之一。最近的一些研究表明氧化应激相关基因的多态性改... 氧化应激反应在突发性聋(简称突聋)的发生、发展过程中起重要作用。越来越多的研究表明突聋的发生可能与遗传因素密切相关,基因多态性与突聋之间的相关性研究成为近年来的研究热点之一。最近的一些研究表明氧化应激相关基因的多态性改变很可能是突聋的重要致病易感因素。本文就近年来氧化应激相关基因多态性与突聋的相关性研究进展作一综述,以期从遗传学方面探讨突聋的可能病因。 展开更多
关键词 氧化应激 基因多态性 突发性聋 病因 易感因素
下载PDF
Paleomagnetic constraints on Paleogene-Neogene rotation and paleo-stress in the northern Qaidam Basin 被引量:1
19
作者 Ling SUN Junliang JI +3 位作者 Bingshuai LI Xingbo LI Wujun WU Kexin ZHANG 《Science China Earth Sciences》 SCIE EI CAS CSCD 2022年第12期2385-2404,共20页
Knowing the rotation and paleo-stress history in Qaidam Basin is a fundamental parameter to quantify the mechanism of intracontinental deformation in Tibetan Plateau.However,few studies have been conducted on tectonic... Knowing the rotation and paleo-stress history in Qaidam Basin is a fundamental parameter to quantify the mechanism of intracontinental deformation in Tibetan Plateau.However,few studies have been conducted on tectonic rotation and stress evolution over long timescales in the Qaidam Basin.Here,we report new magnetic declination and the anisotropy of magnetic susceptibility(AMS)from a~52–7 Ma sequence of fluvial and lacustrine sediments in the Dahonggou(DHG)section in the northern Qaidam Basin.The magnetic declination revealed that the northern Qaidam Basin underwent a clockwise rotation 25.1°±8.6°during~33–17 Ma,followed by a counterclockwise rotation 16.9°±6.8°during~17–13.5 Ma.The AMS results showed that the“earliest deformation”fabrics were interrupted by the“pencil structure”fabrics in the intervals of~52–45 and~21–15 Ma.The interruption,synchronous with the marked deceleration of the India-Asia convergence rate,indicates pulse of strong tectonic compressive stress.In addition,the AMS results documented a transition in stress direction from S-N to SW-NE at~15 Ma,suggesting a kinematic shift in the northeastern TP.Our constraints on the rotation and stress from the northern Qaidam Basin support the two-stage evolution of the Altyn Tagh Fault(ATF).The fast-rate slip motion on the ATF during the early Oligocene caused the clockwise rotation in the northern Qaidam Basin;the second stage with enhanced thrusting since the middle Miocene caused extensive crustal shortening and dispersive NW-trending folds and faults in the Qaidam Basin and the northeastern TP. 展开更多
关键词 Tectonic rotation stress Anisotropy of magnetic susceptibility Paleo-Neogene Northern Qaidam Basin Tibetan Plateau
原文传递
Triple test cross analysis for seed yield and its components in sesame under water stress conditions
20
作者 Mohamed Ali Abdelsatar Yousrya S.A.Metwally Ibthal S.El-Demardash 《Oil Crop Science》 CSCD 2022年第2期71-79,共9页
Water deficit is a limiting factor in sesame cultivars yield,thus identification of genetic mechanisms of sesame traits under water stress conditions is essential to development of water stress tolerant genotypes.Henc... Water deficit is a limiting factor in sesame cultivars yield,thus identification of genetic mechanisms of sesame traits under water stress conditions is essential to development of water stress tolerant genotypes.Hence,the triple test cross(TTC)analysis in F_(2) population of the sesame cross(NA_(76)NA_(54))was used.Since,30 TTC families with their 13 respective parents were evaluated during the summer season 2020 under two irrigation treatments.i.e.,normal irrigation with 5952.38 m^(3) hm^(-2) of applied water,and water stress with 2976.19 m^(3) hm^(-2) of applied water.This was implemented at the experimental field of Kafr El Hamam/Sharkia,Agricultural Research Station,Agricultural Research Center(ARC),Egypt.Additive(D)and dominance(H)gene actions as well as epistatic and its two components of additiveadditive,additivedominance plus dominancedominance were involved in the inheritance of all studied traits under both irrigation treatments and their combined analysis.The degree of dominance(H/D)^(0.5) verified the presence of partial dominance in most cases.The correlation coefficient between sums(additive)and differences(dominance)was non-significant,showing that dominant genes between lines were ambidirectional.The moderately water stress tolerant TTC families as the best selected families were found in families 22,25,10,12,and 15.Therefore,postponing selection in these selected families to later segregating generations for all studied traits would be effective to exploit the positive effects of additiveadditive epistasis. 展开更多
关键词 Epistatic IRRIGATION SESAME Sesamum indicum stress susceptibility index
下载PDF
上一页 1 2 6 下一页 到第
使用帮助 返回顶部