检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

高孔隙水压力对岩石蠕变特性的影响

岩石力学与工程学报 2010年第8期29卷 1603-1609页

作者：佘成学崔旋武汉大学水资源与水电工程科学国家重点实验室湖北武汉430072

设计3种加载方式,其中一种施加高孔隙水压力,分别进行分级加载蠕变试验,用于研究分析高孔隙水压对岩石蠕变特性的影响。首先,利用大理石加工的标准圆柱试件,按3种加载方式分别进行蠕变试验,得到轴向、横向的蠕变变形过程曲线,以及岩石... 详细信息

设计3种加载方式,其中一种施加高孔隙水压力,分别进行分级加载蠕变试验,用于研究分析高孔隙水压对岩石蠕变特性的影响。首先,利用大理石加工的标准圆柱试件,按3种加载方式分别进行蠕变试验,得到轴向、横向的蠕变变形过程曲线,以及岩石破坏时的破坏形态;然后,对3种加载方式下的岩石轴向应变、横向应变、剪应变、体积应变以及破坏形态等进行比较分析;最后,在比较分析的基础上,总结高孔隙水压力对于岩石蠕变及破坏的影响。研究表明:孔隙水压力作用明显,但不是完全作用,即孔隙水压力作用系数接近于1;在高孔隙水压力作用下,岩石的强度大大降低,承载时间大大缩短,破坏时的应变也降低;虽然3种加载情况都是以剪切破坏为主,但在有高孔隙水压力作用下,岩石的破坏更具有突然性;可能不存在一个统一的等效应变阈值,使在不同的加载情况下,应变超过该阈值后即产生加速蠕变破坏;在加速破坏前,除瞬时加载产生的体积应变外,在蠕变过程中,岩石体积应变几乎不变。该成果对于进一步研究考虑孔隙水压力影响的非线性蠕变模型具有指导意义,也可对高孔隙水压力作用下的岩石结构工程处理措施提供指导。

关键词：岩石力学孔隙水压力蠕变特性试验

在线全文

学校读者我要写书评

暂无评论

传统民间改制型儿童斗篷的复原与设计研究

丝绸 2024年第3期61卷 11-19页

作者：吕轩崔荣荣四川师范大学服装与设计艺术学院成都610066 浙江理工大学服装学院杭州310018

传统民间改制型儿童斗篷是利用成人旧衣物改制而成的童装之一。文章以江南大学民间服饰传习馆馆藏和笔者田野考察拍摄的改制型儿童斗篷为研究对象,以探究其改制背景、工艺痕迹、服装结构来推演旧衣物来源,并通过复原马面裙、女褂改制成... 详细信息

传统民间改制型儿童斗篷是利用成人旧衣物改制而成的童装之一。文章以江南大学民间服饰传习馆馆藏和笔者田野考察拍摄的改制型儿童斗篷为研究对象,以探究其改制背景、工艺痕迹、服装结构来推演旧衣物来源,并通过复原马面裙、女褂改制成儿童斗篷的过程为案例进行实证。研究表明:民间制作者通常首选布料面积大、绣花精致具有装饰性的传统民间服饰作为改制材料,其次是其他家纺产品;其设计特征表现为色彩选择以祈福为目的,图案重组以满足显露需求为重点,细节装饰以搭配主体为基准,改制遵循“以大化小”“翻旧为新”“美化传承”的原则。所蕴含的设计思想和文化内涵,充分体现了中华民族的艰苦朴素品质、祈福观念、民间造物智慧。

关键词：传统民间服饰儿童斗篷旧衣改制复原设计特征民间造物智慧

长河坝水电站右岸导流隧洞进口高边坡稳定性有限元计算分析

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

岩石力学与工程学报 2009年第A2期28卷 3686-3691页

作者：佘成学崔旋武汉大学水资源与水电工程国家重点实验室湖北武汉430072

由于受地形条件限制,长河坝水电站导流洞进水口边坡几乎整个边坡设计为直立坡,最大高度为148m。这种边坡布置方式在国内、外很少见,其变形、稳定问题关系到该工程导流方案的成败,非常重要。为了解边坡的稳定性,以及了解边坡加固方式的... 详细信息

由于受地形条件限制,长河坝水电站导流洞进水口边坡几乎整个边坡设计为直立坡,最大高度为148m。这种边坡布置方式在国内、外很少见,其变形、稳定问题关系到该工程导流方案的成败,非常重要。为了解边坡的稳定性,以及了解边坡加固方式的有效性及合理性,采用有限元方法对边坡开挖、加固过程进行模拟,给出边坡的变形、屈服区以及锚杆等应力情况,特别分析裂缝和裂隙对于边坡变形、屈服以及锚杆应力的影响,利用降强度计算方法得到边坡的抗滑稳定安全系数。研究成果对边坡的开挖及加固具有指导意义。

关键词：边坡工程岩石节理稳定

Use of Evidence-Based Research Approach in RCTs of Acupuncture-Related Therapies for Primary Dysmenorrhea: A Meta-Research

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第6期30卷 551-558页

作者： HU Xiao-yi TIAN Zi-yu CHEN Huan HU Xiang-yu MING Tian-yu PENG Hao-xuan JIAO Rui-min SHI Lan-jun XIU Wen-cui YANG Ji-wei GANG Wei-juan JING Xiang-hong Institute of Acupuncture and Moxibustion China Academy of Chinese Medical SciencesBeijingChina Department of Traditional Chinese Medicine Beijing Puren HospitalBeijing100062China

Objective To assess the use of evidence-based research(EBR)approach in randomized controlled trials(RCTs)of acupuncture-related therapies for primary dysmenorrhea(PD).Methods PubMed,EMBASE,Cochrane Library,China National Knowledge Infrastructure,Wanfang Database,Chinese Biomedical Database,and China Science and Technology Journal Database were searched from January 2013 to December 2022 for RCTs of acupuncture on *** full text and references of each RCT were read to assess whether systematic reviews(SRs)or other types of studies with similar research questions and end-users’perspectives were cited to justify and design the *** addition,the discussion section were analyzed to evaluate whether trials placed the new result in the existing SRs to draw a *** logistic regression was used to find variables that associated with 3 aspects of EBR approach:(1)citing clinical studies for justification,(2)citing relevant studies that obtain the perspectives of end users,and(3)citing clinical studies for results *** Of 473 RCTs included,45.67%(216)of the trials cited relevant similar studies,21.56%(102)referenced to the studies that collected end-users’perspectives,and 10.99%(52)placed result in the context of the previous *** RCTs appropriately applied EBR *** all the included studies,3.17%(15)of the trials used SRs to inform study questions but none of them used updated SRs with acceptable quality;1.05%(5)of the trials cited SRs of end-user’s perspectives in the justification and design of the study,and only 1 trial added results in existing SR to draw a *** of publication,language,funding,registration,ethical approval and number of sites were significantly associated with 1 of the 3 aspects of EBR *** Few RCTs in acupuncture-related therapies for PD used the EBR approach to minimize research ***,research institutes,funding agencies,ethics committees,journals and peer

关键词： evidence-based research acupuncture therapy primary dysmenorrhea randomized controlled trial systematic review end-usersperspective meta-research

COR27 and COR28 encode nighttime repressors integrating Arabidopsis circadian clock and cold response

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2017年第2期59卷 78-85页

作者： peng wang xuan cui chunsheng zhao liyan shi guowei zhang fenglong sun xiaofeng cao li yuan qiguang xie xiaodong xu hebei key laboratory of molecular and cellular biology key laboratory of molecular and cellular biology of ministry of educationcollege of life scienceshebei normal university hebei collaboration innovation center for cell signaling Shijiazhuang 050024China state key laboratory of plant genomics and national center for plant gene research institute of genetics and developmental biologychinese academy of sciencesBeijing 100101China

Summary It was noted that circadian components function in plant adaptation to diurnal temperature cycles and freezing tolerance. Our genome-wide transcriptome analysis revealed that evening-phased COR27 and COR28 mainly repress the transcription of clockassociated evening genes PRRS, ELF4 and cold-responsive genes. Chromatin immunoprecipitation indicated that CCAI is recruited to the site containing EE elements of COR27 and COR28 promoters in a temperaturedependent way. Further genetic analysis shows COR28 is essential for the circadian function of PRR9 and PRRT. Together, our results support a role of COR27 and COR28 as nighttime repressors integrating circadian clock and plant cold stress responses.

关键词： CCA COR27 and COR28 encode nighttime repressors integrating Arabidopsis circadian clock and cold response EE Figure

Quantum dynamics within curved thin layers with deviation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第7期33卷 502-507页

作者：程润赵浩罗翠柏周璇王必利李延标王骏 Physics Department of Basic Department Army Engineering University of PLANanjing 211101China National Laboratory of Solid State Microstructure Collaborative Innovation Center of Advanced Microstructuresand School of PhysicsNanjing UniversityNanjing 210093China School of Physics and Electronics Hunan UniversityChangsha 410082China Department of Physics Anhui Normal UniversityWuhu 241002China

Combining the deviation between thin layers' adjacent surfaces with the confining potential method applied to the quantum curved systems,we derive the effective Schr?dinger equation describing the particle constrained within a curved layer,accompanied by a general geometric potential V_(gq) composed of a compression-corrected geometric potential V_(gq)~*and a novel potential V_(gq)~(**) brought by the *** this analysis to the cylindrical layer emerges two types of deviation-induced geometric potential,resulting from the the cases of slant deviation and tangent deviation,respectively,which strongly renormalizes the purely geometric potential and contribute to the energy spectrum based on a very substantial deepening of bound states they offer.

关键词： confining potential method quantum mechanics curved thin layer

在线全文

学校读者我要写书评

暂无评论

含砂岩石力学特性及其致灾机制研究

岩土力学 2023年第4期44卷 1230-1244页

作者：岳豪杨胜利翟瑞昊张燊崔轩中国矿业大学(北京)能源与矿业学院北京100083

含砂岩石是发生突水溃砂灾害前在高位关键层形成的特殊岩石,其强度与力学性质均与普通岩石不同,决定着高位关键层的稳定性。研究发现:不同裂隙角的裂隙岩石与含砂岩石具有不同的特征应力,且随着裂隙角的增加,裂隙岩石与含砂岩石的起裂... 详细信息

含砂岩石是发生突水溃砂灾害前在高位关键层形成的特殊岩石,其强度与力学性质均与普通岩石不同,决定着高位关键层的稳定性。研究发现:不同裂隙角的裂隙岩石与含砂岩石具有不同的特征应力,且随着裂隙角的增加,裂隙岩石与含砂岩石的起裂应力、损伤应力和峰值应力均增加,双峰应力先增加后减小。相同裂隙角下的含砂岩石各特征应力均小于裂隙岩石,说明砂体对岩石特征应力具有弱化效应。从破坏形态来看,裂隙岩石易呈现翼形拉伸裂隙,含砂岩石在低裂隙角(30°)条件下形成拉伸裂隙,高裂隙角(60°)条件下易形成剪切裂隙,表明砂体进入岩石裂隙后对岩石具有剪切效应。同时建立了充砂力学模型,指出了含砂岩石强度小于裂隙岩石的原因是砂体降低了岩石的摩擦系数。根据声发射累计振铃计数定义了岩石损伤量并分析了含砂岩石致灾机制,现场溃砂灾害可分为4个阶段:弹性变形阶段、裂隙扩展阶段、蓄砂储能阶段、溃砂释能阶段。最后利用PFC2D验证了裂隙岩石与含砂岩石的差异性,分析了不同类型岩石的能量演化规律。研究结果可作为煤矿顶板突水溃砂现象的前兆信息识别,有助于指导突水溃砂工作面的安全生产。

关键词：声发射裂隙岩石特征应力应力强度因子

LncRNA CCRR maintains Ca^(2+)homeostasis against myocardial infarction through the FTO-SERCA2a pathway

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第8期67卷 1601-1619页

作者： Hua Yang Lina xuan Shengjie Wang Huishan Luo Xiaomeng Duan Jianjun Guo Shijia cui Jieru Xin Junwei Hao Xiufang Li Jun Chen Feihan Sun Xiaolin Hu Siyun Li Ying Zhang Lei Jiao Baofeng Yang Lihua Sun Department of Pharmacology Harbin Medical University(State Key Laboratory of Frigid Zone Cardiovascular Diseasethe State-Province Key Laboratories of Biomedicine-Pharmaceutics of ChinaKey Laboratory of Cardiovascular ResearchMinistry of EducationJoint International Research Laboratory of Cardiovascular Medicine ResearchMinistry of EducationChina)College of PharmacyHarbin Medical UniversityHarbin 150081China

Cardiac conduction regulatory RNA(CCRR)has been documented as an antiarrhythmic lncRNA in our earlier *** study aimed to evaluate the effects of CCRR on SERCA2a and the associated Ca^(2+)homeostasis in myocardial infarction(MI).Overexpression of CCRR via AAV9-mediated delivery not only partially reversed ischemia-induced contractile dysfunction but also alleviated abnormal Ca^(2+)homeostasis and reduced the heightened methylation level of SERCA2a following *** effects were also observed in CCRR overexpressing transgenic mice.A conserved sequence domain of CCRR mimicked the protective function observed with the full ***,silencing CCRR in healthy mice led to intracellular Ca^(2+)overloading of *** increased SERCA2a protein stability by upregulating FTO *** direct interaction between CCRR and FTO protein was characterized by RNA-binding protein immunoprecipitation(RIP)analysis and RNA pulldown *** of NFATc3 was identified as an upstream mechanism responsible for CCRR downregulation in *** study demonstrates that CCRR is a protective lncRNA that acts by maintaining the function of FTO,thereby reducing the m^(6)A RNA methylation level of SERCA2a,ultimately preserving calcium homeostasis for myocardial contractile function in ***,CCRR may be considered a promising therapeutic strategy with a beneficial role in cardiac pathology.

关键词： CCRR calcium homeostasis FTO myocardial infarction SERCA2a

典型缺砂型中线式尾矿库砂量平衡分析及坝体安全研究

在线全文

学校读者我要写书评

暂无评论

有色金属工程 2023年第4期13卷 102-110页

作者：甘海阔周汉民崔旋矿冶科技集团有限公司北京100160

中线式尾矿库往往具有库容大、边坡稳定性高的优势,但由于对库内及库外砂量平衡关系有严格的要求,在我国工程应用相对较少。以某缺砂型中线式尾矿库为案例,结合尾砂旋流分级试验结果,分析了尾矿库总体筑坝砂量富裕与分阶段筑坝砂量存在... 详细信息

中线式尾矿库往往具有库容大、边坡稳定性高的优势,但由于对库内及库外砂量平衡关系有严格的要求,在我国工程应用相对较少。以某缺砂型中线式尾矿库为案例,结合尾砂旋流分级试验结果,分析了尾矿库总体筑坝砂量富裕与分阶段筑坝砂量存在欠缺之间的矛盾,采用改良坝轴线位置、下游废石填补、优化堆积坝外坡比等工艺技术措施,实现了尾砂中线式筑坝的顺利实施。在此基础上,对尾矿库进行了全面的空间渗流场模拟及坝体稳定性分析。结论表明:各工况下尾矿坝浸润线均相对较深,尾矿库具有较高的坝体本质安全度。

关键词：中线式尾矿库砂量平衡渗流场坝体安全