检索结果-南通市图书馆

Crystalline-amorphization-recrystallization structural transition and emergent superconductivity in van der Waals semiconductor SiP under compression

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

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 115-122页

作者： Chunhua Chen Zhenyu Ding yonghui Zhou Yifang Yuan Nixian Qian Jing wang Shuyang wang Ying Zhou Chao An Min Zhang Xuliang Chen Xiaoping Yang Mingliang Tian Zhaorong Yang Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityHefei 230601China Institutes of Physical Science and Information Technology Anhui UniversityZhengzhou 450001China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

van der Waals(vdW)semiconductors have gained significant attention due to their unique physical properties and promising applications,which are embedded within distinct crystallographic ***,we report a pressure-induced crystallineamorphization-recrystallization transition under compression in binary vdW semiconductor *** compression to 52 GPa,bulk SiP undergoes a consecutive phase transition from pristine crystalline to amorphous phase,ultimately to recrystallized *** employing synchrotron X-ray diffraction experiments in conjunction with high-pressure crystal structure searching techniques,we reveal that the recrystallized Si P hosts a tetragonal structure(space group I4mm)and further transforms partially into a cubic phase(space group Fm3m).Consistently,electrical transport and alternating-current magnetic susceptibility measurements indicate the presence of three superconducting phases,which are embedded in separate crystallographic symmetries—the amorphous,tetragonal,and cubic ***,a high superconducting transition temperature of 12.3 K is observed in its recovered tetragonal phase during *** findings uncover a novel phase evolution path and elucidate a pressure-engineered structure-property relationship in vdW semiconductor *** results not only offer a new platform to explore the transformation between different structures and functionalities,but also provide new opportunities for the design and exploration of advanced devices based on vdW materials.

关键词： recrystallization transition amorphous

Unprecedented sesquiterpene-polycyclic polyprenylated acylphloroglucinol adduct against acute myeloid leukemia via inhibiting mitochondrial complex Ⅴ

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第10期35卷 305-308页

作者： Zhengyi Shi Jie Yin Yang Xiao Zhangrong Hou Fei Song Jianping wang Qingyi Tong Changxing Qi yonghui Zhang Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation School of PharmacyTongji Medical CollegeHuazhong University of Science andTechnologyWuhan430030China

Monosescinol A(1),the first example of sesquiterpene–polycyclic polyprenylated acylphloroglucinol(PPAP)adduct,which represented a new subclass of PPAP-type natural products,along with two new congeners with normal spiro 6/6/5 tricyclic architecture,were isolated from Hypericum *** A possessed an unprecedented 6/5/5/6/6 pentacyclic carbon skeleton that might be assembled from the 6/6/5 carbon skeleton,via the splitting decomposition of C-3/C-14,and the attack from the C-3 in the PPAP core to C-28 in sesquiterpene *** addition,we have firstly confirmed that 24R configuration was existed in sec–Bu containing PPAPs by single crystal diffraction data analysis of monosescinol B(2),that might provide an enlightenment in the configurational determination of sec–Bu containing ***,further pharmacological research has found that compound 1 exhibited remarkable pharmacological effects against acute myeloid leukemia(AML)cell lines,with direct inhibition of mitochondrial complex V and an increase in mitochondrial membrane potential,and led to an induction of oxidative stress,endogenous inflammation,and apoptosis of AML cells.

关键词： PPAP adduct Single-crystal X-ray diffraction Keto-enol tautomerism Plausiblebiosynthetic pathway Cytotoxic activity

在线全文

学校读者我要写书评

暂无评论

麦胚蛋白基姜黄素乳液的制备及其稳定性

食品研究与开发 2024年第15期45卷 80-84,106页

作者：王永辉何雨薇郭卫芸高雪丽李光辉何胜华黄继红许昌学院食品与药学院河南许昌461000 功能食品绿色制造河南省协同协同创新中心河南许昌461000

利用小麦胚芽蛋白稳定的水包油乳液对姜黄素进行包埋,通过对乳液液滴粒径测定及微观结构的表征,考察麦胚蛋白浓度对乳液粒径以及乳液物理稳定性的影响,进一步研究贮藏过程及加热处理对乳液中姜黄素化学稳定性的影响。结果表明,随着乳状... 详细信息

利用小麦胚芽蛋白稳定的水包油乳液对姜黄素进行包埋,通过对乳液液滴粒径测定及微观结构的表征,考察麦胚蛋白浓度对乳液粒径以及乳液物理稳定性的影响,进一步研究贮藏过程及加热处理对乳液中姜黄素化学稳定性的影响。结果表明,随着乳状液中麦胚蛋白浓度的增加(0.5%~4.0%),乳液液滴的粒径从1.9μm降低至0.3μm,乳液的贮藏稳定性得到提高。高温处理对于乳液中姜黄素的稳定性影响较大。经80℃处理后,姜黄素含量明显下降,但麦胚蛋白浓度增加有利于提高乳液中姜黄素的热稳定性。小麦胚芽蛋白构建的姜黄素乳液体系具有较好的稳定性,其在功能性食品的加工中具有良好的应用潜力。

关键词：小麦胚芽蛋白姜黄素乳液体系稳定性功能食品

激光增材制造过程中激光与粉末的相互作用研究现状

在线全文

学校读者我要写书评

暂无评论

中国表面工程 2021年第2期34卷 1-12页

作者：叶福兴王永辉娄智天津大学材料科学与工程学院天津市现代连接技术重点实验室天津300072

激光增材制造是通过激光加热熔化粉末或丝材并逐层叠加而形成所需工件的一种增量制造技术。该技术涉及非常复杂的非平衡物理和化学冶金过程,在加工过程中易产生非平衡组织和晶粒取向。激光与粉末的相互作用过程是整个加工过程中最为重... 详细信息

激光增材制造是通过激光加热熔化粉末或丝材并逐层叠加而形成所需工件的一种增量制造技术。该技术涉及非常复杂的非平衡物理和化学冶金过程,在加工过程中易产生非平衡组织和晶粒取向。激光与粉末的相互作用过程是整个加工过程中最为重要的部分,系统总结激光与粉末的相互作用对于增进对激光增材制造技术的理解,进而提升工件性能具有重要的意义。按照送粉式与铺粉式激光增材制造两种加工方式,分析了激光能量的衰减、粉末颗粒温度的上升以及激光-粉末-熔池的相互作用,综述了激光与粉末相互作用的研究现状。

关键词：激光增材制造激光粉末相互作用激光-粉末-熔池

在线全文

学校读者我要写书评

暂无评论

以技术文化的视角考察远程教育

中国远程教育 2008年第19期 23-27,37页

作者：王永辉江苏广播电视大学远程开放教育研究所

远程教育研究领域一直有着技术分析的传统,技术作为远程教育的文化组成,虽不是远程教育存在的决定因素,但却是最深刻的影响因素。在远程教育中,技术不仅体现"物的文化",同样也是"人的文化",技术的选择和改变是一个文化逐步积累的过程。... 详细信息

远程教育研究领域一直有着技术分析的传统,技术作为远程教育的文化组成,虽不是远程教育存在的决定因素,但却是最深刻的影响因素。在远程教育中,技术不仅体现"物的文化",同样也是"人的文化",技术的选择和改变是一个文化逐步积累的过程。技术文化直接影响着远程教育对技术的选择和使用,同样也深层次影响着学习文化的变迁。在实践中,需要克服工具理性的片面思维,以"教育学"而不仅是"技术学"的观点来解决教育问题。

关键词：远程教育技术文化技术分析学习文化

Seeing Is Believing:Directly Imaging Contractions of Artificial Molecular Muscles with Platinum Atom Markers

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第9期6卷 2162-2174页

作者： Dan-Yang Zhang yonghui Zheng Yefei Jiang Wei-Jian Li Xu-Qing wang Lianrui Hu Wei wang Hai-Bo Yang Shanghai Key Laboratory of Green Chemistry and Chemical Processes State Key Laboratory of Petroleum Molecular&Process EngineeringSchool of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062 Key Laboratory of Polar Materials and Devices(MOE) Department of ElectronicsEast China Normal UniversityShanghai 200241 Shanghai Center of Brain-Inspired Intelligent Materials and Devices East China Normal UniversityShanghai 200241

Artificial molecular muscles undergo well-controlled contractile and extensile motions upon external stimulation,leading to remarkable length *** such length changes at the molecular level is essential to the design of integrated artificial molecular muscles that mimic biological *** advantage of the strong contrast of platinum(Pt)atoms in high-angle annular dark-field scanning transmission electron microscopy images,we imaged Pt-containing molecular[c2]daisy chains directly by employing metal atom *** length changes and associated conformational transformations of these newly developed artificial molecular muscles have been measured experimentally in combination with theoretical *** contraction ratios of these two molecular muscles with the TEMPO or pyrene anchoring group were calculated to be 21.0%or 15.7%respectively,suggesting a substantial anchoring *** study demonstrates the experimental measurement of the length changes of artificial molecular muscles and provides a new avenue for investigating the motion of artificial molecular machines.

关键词： mechanically interlocked molecules molecular[c2]daisy chain artificial molecular machines high-angle annular dark-field scanning transmission electron microscopy stimuli responsiveness

Long noncoding RNA(lncRNA)H19:An essential developmental regulator with expanding roles in cancer,stem cell differentiation,and metabolic diseases

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

Genes & Diseases 2023年第4期10卷 1351-1366页

作者： Junyi Liao Bowen Chen Zhenglin Zhu Chengcheng Du Shengqiang Gao Guozhi Zhao Piao Zhao yonghui wang Annie wang Zander Schwartz Lily Song Jeffrey Hong William Wagstaff Rex CHaydon Hue HLuu Jiaming Fan Russell RReid Tong-Chuan He Lewis Shi Ning Hu Wei Huang Departments of Orthopedic Surgery and Urology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China Orthopedic Research Center Chongqing Medical UniversityChongqing 400016China Molecular Oncology Laboratory Department of Orthopaedic Surgery and Rehabilitation MedicineThe University of Chicago Medical CenterChicagoIL 60637USA Department of Clinical Laboratory Medicine Shanghai Jiaotong University School of MedicineShanghai 200000China School of Biomedical Engineering Vanderbilt UniversityNashvilleTN 37235USA The Medical Scientist Training Program The University of Chicago Pritzker School of MedicineChicagoIL 60637USA Ministry of Education Key Laboratory of Diagnostic Medicine Department of Clinical BiochemistryThe School of Laboratory MedicineChongqing Medical UniversityChongqing 400016China Laboratory of Craniofacial Suture Biology and Development Department of Surgery Section of Plastic SurgeryThe University of Chicago Medical CenterChicagoIL 60637USA

Recent advances in deep sequencing technologies have revealed that,while less than 2%of the human genome is transcribed into mRNA for protein synthesis,over 80%of the genome is transcribed,leading to the production of large amounts of noncoding RNAs(ncRNAs).It has been shown that ncRNAs,especially long non-coding RNAs(lncRNAs),may play crucial regulatory roles in gene *** one of the first isolated and reported lncRNAs,H19 has gained much attention due to its essential roles in regulating many physiological and/or pathological processes including embryogenesis,development,tumorigenesis,osteogen-esis,and ***,H19 mediates diverse regulatory functions by serving as competing endogenous RNAs(CeRNAs),Igf2/H19 imprinted tandem gene,modular scaffold,cooperating with H19 antisense,and acting directly with other mRNAs or ***,we summarized the current understanding of H19 in embryogenesis and development,cancer development and progression,mesenchymal stem cell lineage-specific differentiation,and metabolic *** discussed the potential regulatory mechanisms underlying H19’s func-tions in those processes although more in-depth studies are warranted to delineate the exact molecular,cellular,epigenetic,and genomic regulatory mechanisms underlying the physiolog-ical and pathological roles of ***,these lines of investigation may lead to the development of novel therapeutics for human diseases by exploiting H19 functions.

关键词： Cancer Epigenetic regulation H19 LncRNA Long-noncoding RNA Metabolic diseases Stem cell differentiation

The influence of initiating and reacting joint attention on social orienting

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

The influence of initiating and reacting joint attention on ...

浅析中国在东亚区域合作中提供公共产品的若干问题

第二十四届全国心理学学术会议

作者： Yanying Tian Min Hai Tingkang Zhang yonghui wang the College of Psychology Shaanxi Normal University

Before social cognition there is jointly coordination of attention information of self and *** non-verbal reciprocal coordination of attention facilitates the development of the capacity to share experiences about objects or events with others,otherwise known as joint *** JA,an initiator spontaneously selects a shared point of reference,and the responder follows the direction of the initiator’s gaze to share the attention on the *** view of this,researches into the early development of joint attention distinguish between initiative joint attention(IJA) by directing or leading the attention of others,and reactive joint attention(RJA) by following the direction of others’ attention to share a common point of *** social interactions,joint attention plays a fundamental role that guarantees we refer to the same object,understand each other’s mental states,coordinate our actions,and improve sophisticated social *** evidences at both the behavioral and neural circuit levels demonstrate that engaging in joint attention modulates multiple cognitive abilities,in particular the social orienting of the initiator to *** work in gaze leading establishes that participants spontaneously orient their attention towards faces that have followed their gaze,even though without explicit instructions to do *** findings appear to offer an implicit but reliable insight into that people who follow our gaze to engage in joint attention are prioritized for visual processing,and this attention shift could contribute to the maintenance and evaluation of an ongoing social ***,it remains an open question whether this distinct attention form,social orienting,is simply presented by initiator Yet,joint attention is the result of reciprocal interaction of both initiator and ***,the current research predicted that the responder would present a similar pattern of social orienting,but it is different from ini

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

东南亚研究 2005年第5期 16-19,24页

作者：王勇辉复旦大学国际关系与公共事务学院上海200433

20世纪90年代以来,东亚的区域合作已经取得了显著进展,但强调民族主义和跨国主义并存的东亚新区域主义的发展并不等于东亚一体化的形成,东亚区域合作仍然在不断整合当中。中国作为正在崛起中的大国,在东亚区域合作中担当着重要角色。中... 详细信息

20世纪90年代以来,东亚的区域合作已经取得了显著进展,但强调民族主义和跨国主义并存的东亚新区域主义的发展并不等于东亚一体化的形成,东亚区域合作仍然在不断整合当中。中国作为正在崛起中的大国,在东亚区域合作中担当着重要角色。中国能否在东亚区域合作中提供公共产品,以何种方式提供公共产品,在提供公共产品方面以何为现实依据,这不仅对东亚区域合作的成功与结构整合有重大意义,也将对东亚国际关系乃至整个世界格局产生重大影响。

关键词：东亚区域合作公共产品地区主义大国战略