检索结果-南通市图书馆

Quasi-two-dimensional strong liquid-like dynamics of surface atoms in metallic glasses

Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 102-109页

作者： Bing Wang Xuanqiao gao Rui Su Pengfei Guan School of Physical Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Innovation Center NPU chongqing Northwestern Polytechnical UniversityChongqing 401135China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China Northwest Institute for Nonferrous Metal Research Xi'an 710016China Institute of Advanced Magnetic Materials College of Materials and Environmental EngineeringHangzhou Dianzi University Hangzhou 310018China Beijing Computational Science Research Center Beijing 100093China

The fast dynamic properties of the surface of metallic glasses(MGs) play a critical role in determining their potential applications. However, due to the significant difference in thermal history between atomic simulation models and laboratory-made samples, the atomic-scale behaviors of the fast surface dynamics of MGs in experiments remain uncertain. Herein, we prepared model MG films with notable variations in thermal stability using a recently developed efficient annealing protocol, and investigated their atomic-scale dynamics systematically. We found that the dynamics of surface atoms remain invariant, whereas the difference in dynamical heterogeneity between surface and interior regions increases with the improvement of thermal stability. This can be associated with the more pronounced correlation between atomic activation energy spectra and depth from the surface in samples with higher thermal stability. In addition, dynamic anisotropy appears for surface atoms, and their transverse dynamics are faster than normal components, which can also be interpreted by activation energy spectra. Our results reveal the presence of strong liquid-like atomic dynamics confined to the surface of laboratory-made MGs, illuminating the underlying mechanisms for surface engineering design, such as cold joining by ultrasonic vibrations and superlattice growth.

关键词： metallic glasses thermal stability invariant surface dynamics potential energy landscape dynamic anisotropy and heterogeneity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Advances in the research of intestinal fungi in Crohn's disease

引用

World Journal of Gastroenterology 2024年第39期30卷 4318-4323页

作者： Mo-Wei Kong Yang Yu Peng Wang Ying Wan Yu gao Chun-Xiang Zhang Department of Cardiology The Affiliated Hospital of Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of General Surgery Xinqiao HospitalArmy Medical UniversityChongqing 400037China School of Basic Medical Sciences Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Endocrinology Affiliated Hospital of Chengde Medical UniversityChengde 067000Hebei ProvinceChina

This article reviews of the original research published by Wu et al in the World Journal of Gastroenterology,delving into the pivotal role of the gut microbiota in the pathogenesis of Crohn's disease(CD).Insights were gained from fecal microbiota transplantation(FMT)in mouse models,revealing the intricate interplay between the gut microbiota,mesenteric adipose tissue(MAT),and creeping *** study uncovered the characteristics of inflammation and fibrosis in the MAT and intestinal tissues of patients with CD;moreover,through the FMT mouse model,it observed the impact of samples from healthy patients and those with CD on *** pathogenesis of CD is complex,and its etiology remains unclear;however,it is widely believed that gut microbiota dysbiosis plays a significant ***,with the development and application of next-generation sequen-cing technology,research on the role of fungi in the pathogenesis and chronicity of CD has *** editorial serves as a supplement to the research by Wu et al who discussed advances related to the study of fungi in CD.

关键词： Intestinal microbiota Crohn's disease pathogenesis Fecal microbiota trans-plantation Mesenteric adipose tissue Gut fungal dynamics

来源：

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

Research progress of pavement icing status recognition and icing sensor

引用

Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Peng Guo Jiaomeng Zheng Junfeng gao Ruiqing Ma Hongren Gong Yuanzhao Chen National and Local Joint Engineering Research Center of Transportation and Civil Engineering Materials， chongqing Jiaotong University School of Materials Science and Engineering， chongqing Jiaotong University Planning and Construction Department of Luoyang High-tech Industrial Development Zone Key Laboratory of Road and Traffic Engineering of Ministry of Education， Tongji University School of Civil Engineering and Transportation， North China University of Water Resources and Electric Power

The state of the road surface weather is crucial to road safety， and road icing is one of the main factors causing traffic accidents. To promote the development of road icing recognition and sensing technology， this article reviews the research progress of road icing sensors both domestically and internationally. Firstly， the classification of pavement status was introduced， the hazards of pavement icing to traffic safety were clarified， and the importance of pavement icing identification to traffic safety management was recognized. Then， based on the different ways of pavement icing perception， the pavement icing sensor was divided into contact pavement icing sensor and non-contact pavement icing sensor， and the classification， working principle and characteristics of pavement icing sensor were analyzed and summarized. At the same time， based on the differences of different pavement state recognition technologies and the actual road inspection and monitoring needs， the application scope， recommendation index and improvement suggestions of various pavement icing sensors are given. Finally， the future improvement direction of pavement icing sensor is discussed. It is suggested that the meteorological information system of the road network should be combined with the road icing sensor to realize the timely warning of the road icing state and improve the road traffic safety.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

20例宫颈癌根治性放疗后复发患者行全盆腔脏器切除保肛治疗的效果分析

引用

中华肿瘤杂志 2020年第3期42卷 242-246页

作者：王刚成高重庆刘英俊韩广森王有财张国强丁亮亮李斌王葆春常顺伍郑州大学附属肿瘤医院普外科 450008 海南省人民医院普外科海口570100

目的探讨宫颈癌根治性放疗后中心型复发行全盆腔脏器切除后保肛治疗患者的手术方式和疗效。方法回顾性分析2013年1月至2017年12月在郑州大学附属肿瘤医院和海南省人民医院行全盆腔脏器切除保肛治疗的20例宫颈癌根治性放疗后中心型复发... 详细信息

目的探讨宫颈癌根治性放疗后中心型复发行全盆腔脏器切除后保肛治疗患者的手术方式和疗效。方法回顾性分析2013年1月至2017年12月在郑州大学附属肿瘤医院和海南省人民医院行全盆腔脏器切除保肛治疗的20例宫颈癌根治性放疗后中心型复发患者的临床资料,评价手术时间、术中出血量、患者的住院时间、肛门功能和术后并发症等指标。结果20例宫颈癌根治性放疗后复发患者全盆腔脏器切除后行保肛术的中位手术时间为135.2 min,术中中位出血量为680 ml,中位住院时间为16.5 d。其中18例患者术后愈合良好,术后6个月肛门功能逐渐恢复正常。1例患者出现外置结肠与肛门周围粘连愈合不全,1例患者出现骶前感染。20例患者的术后病理均证实为复发,其中鳞癌11例,腺癌7例,腺鳞癌2例。结论对于宫颈癌根治性放疗后中心型复发患者行全盆腔脏器切除后保肛是安全可靠的,且术后肛门功能良好,保肛可明显提高患者的术后生活质量,是一种值得推广的手术方式。

关键词：宫颈肿瘤复发外科手术全盆腔脏器切除

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Highly sensitive nanozyme strip:An effective tool for forensic material evidence identification

引用

Nano Research 2024年第3期17卷 1785-1791页

作者： Juanji Hong Zhanjun Guo Dihan Duan Yi Zhang Xin Chen Yongjiu Li Zheng Tu Lei Feng Lei Chen Xiyun Yan Lizeng gao Minmin Liang Demin Duan Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China College of Bioscience and Biotechnology Shenyang Agricultural UniversityShenyang 110866China chongqing kangjuquanhong biology science and technology Co. ltdChongqing 400026China Key Laboratory of Forensic Genetics Institute of Forensic ScienceMinistry of Public SecurityBeijing 100038China CAS Engineering Laboratory for Nanozyme Key Laboratory of BiomacromoleculesInstitute of BiophysicsChinese Academic of ScienceBeijing 100101China

During criminal case investigations,blood evidence tracing is critical for criminal ***,the blood stains are often cleaned or covered up after the crime,resulting in trace residue and difficult ***,a highly sensitive and specific method for the rapid detection of human blood stains remains *** solve this problem,we established a nanozyme-based strip for rapid detection of blood evidence with high sensitivity and *** construct reliable nanozyme strips,we synthesized CoFe_(2)O_(4) nanozymes with high peroxidase-like activity by scaling up to gram level,which can be supplied for six million tests,and conjugated antibody as a detection probe in nanozyme *** developed CoFe_(2)O_(4) nanozyme strip can detect human hemoglobin(HGB)at a concentration as low as 1 ng/mL,which is 100 times lower than the commercially available colloidal gold strips(100 ng/mL).Moreover,this CoFe_(2)O_(4) nanozyme strip showed high generality on 12 substrates and high specificity to human HGB among 13 animal blood ***,we applied the developed CoFe_(2)O_(4) nanozyme strip to successfully detect blood stains in three real cases,where the current commercial colloidal gold strip failed to *** results suggest that the CoFe_(2)O_(4) nanozyme strip can be used as an effective on-scene detection method for human blood stains,and can further be used as a long-term preserved material evidence for traceability inquiry.

关键词： CoFe_(2)O_(4)nanozyme nanozyme strip peroxidase-like activity human hemoglobin blood evidence

来源：

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

Solid reaction mechanism of CaHPO_4·2H_2O + CaCO_3 with and without yttria

引用

Rare Metals 2009年第1期28卷 77-81页

作者： WANG Yong gao Jiacheng HU Jinzhu ZHANG Yan College of Materials Science and Engineering Chongqing University Chongqing 400045 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400045 China College of Materials Science and Engineering Southwest University Chongqing 400700 China

The effect of yttria on the solid reaction mechanism of a CaHPO4·2H2O ＋ CaCO3 system at different temperatures was experimentally stud-ied. The samples with and without yttria were subjected to thermogravimetric/differential scanning calorimetry measurement. The samples were heat treated at the temperatures corresponding to the peaks on the DSC spectra, and the resulted phase compositions were identified by X-ray diffraction. The transformation mechanism was deduced by comparing the phases obtained at different temperatures. The results show that the transformations at below 1073 K are not affected by yttria, but all those at above 1073 K are completely altered. The formation tem-perature of hydroxyapatite decreases by 134 K, and the decomposition temperature increases by 38 K. The polymorphous transformation of Ca3（PO4）2 from β phase to α phase increases by 47 K. The thermodynamic properties of the transformations at above 1073 K are also modi-fied by the addition of yttria; that is, the endothermal peaks are substituted by exothermal peaks.

关键词： bioceramics solid reaction mechanism X-ray diffraction thermal analysis yttria

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synergistic effects of planting density and nitrogen fertilization on chlorophyll degradation and leaf senescence after silking in maize

引用

The Crop Journal 2024年第2期12卷 605-613页

作者： Tianqiong Lan Lunjing Du Xinglong Wang Xiaoxu Zhan Qinlin Liu Gui Wei Chengcheng Lyu Fan Liu Jiaxu gao Dongju Feng Fanlei Kong Jichao Yuan Key Laboratory of Crop Physiology Ecologyand Cultivation SouthwestMinistry of AgricultureSichuan Agricultural UniversityChengdu 611130SichuanChina chongqing Academy of Agricultural Sciences Chongqing 401329China College of Agronomy Sichuan Agricultural UniversityChengdu 611130SichuanChina

Regulating planting density and nitrogen(N)fertilization could delay chlorophyll(Chl)degradation and leaf senescence in maize *** study measured changes in ear leaf green area(GLA_(ear)),Chl content,the activities of Chl a-degrading enzymes after silking,and the post-silking dry matter accumulation and grain yield under multiple planting densities and N fertilization *** dynamic change of GLA_(ear)after silking fitted to the logistic model,and the GLA_(ear) duration and the GLAearat 42 d after silking were affected mainly by the duration of the initial senescence period(T_(1))which was a key factor of the leaf *** average chlorophyllase(CLH)activity was 8.3 times higher than pheophytinase activity and contributed most to the Chl content,indicating that CLH is a key enzyme for degrading Chl a in *** density increased the CLH activity and decreased the Chl content,T1,GLAear,and GLA_(ear) *** high density,appropriate N application reduced CLH activity,increased Chl content,prolonged T1,alleviated high-density-induced leaf senescence,and increased post-silking dry matter accumulation and grain yield.

关键词： Density Nitrogen fertilization Leaf senescence Chlorophyll-degrading enzyme Logistic model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Construction and Practice of First-Class Courses on Virtual Simulation Experimental Teaching of Urban Overpasses

引用

Journal of Contemporary Educational Research 2024年第5期8卷 289-296页

作者： Jun Lin Dingyuan Luo Taotao gao chongqing Institute of Engineering Chongqing 400056China

Virtual simulation experiment,as a new way to promote the digital transformation of education,has a broad development prospect and application *** civil engineering experimental volume and space are huge,it has a long construction period,is highly dangerous,and is difficult to experiment *** order to solve the contradiction between the traditional theory teaching of civil engineering and the engineering training of students,the construction of virtual simulation experimental teaching courses with a high degree of realism,intuition,and accuracy can be used as a useful supplement and innovation of experimental and practical *** paper takes the virtual simulation experimental teaching course of urban overpasses as an example,introduces the necessity and practicability of the course construction,and describes the experimental principle structure of the course,the simulation scene design,the experimental teaching process,the experimental method,*** course has achieved good application results,and it has been recognized as the first-class virtual simulation teaching course of the chongqing Municipal Government,which provides certain references to the construction of the same type of courses in the civil engineering profession.

关键词： Digital transformation of education Virtual simulation experiment Civil engineering First-class course construction

来源：

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

机器学习驱动难熔高熵合金设计的现状与展望

引用

材料工程 2024年第1期52卷 27-44页

作者：高田创高建宝李谦张利军中南大学粉末冶金国家重点实验室长沙410083 重庆大学国家镁合金材料工程技术研究中心重庆400044

难熔高熵合金兼具高强度、高硬度、抗高温氧化等优异综合性能,在航空、航天、核能等领域具有广阔的应用前景和研究价值。但难熔高熵合金成分复杂、设计难度高,严重制约了高性能难熔高熵合金的进一步发展。近年来,机器学习凭借着高效准... 详细信息

难熔高熵合金兼具高强度、高硬度、抗高温氧化等优异综合性能,在航空、航天、核能等领域具有广阔的应用前景和研究价值。但难熔高熵合金成分复杂、设计难度高,严重制约了高性能难熔高熵合金的进一步发展。近年来,机器学习凭借着高效准确的建模预测能力,逐步应用于高性能合金的设计和开发。本文在广泛收集机器学习驱动难熔高熵合金设计研究成果的基础上,详细综述了机器学习在辅助合金相结构设计、力学性能预测、强化机理分析和加速原子模拟等方面的应用与进展。最后,总结了该领域当前存在的不足,并针对如何推进高性能难熔高熵合金的设计进行了展望,包括构建难熔高熵合金高质量数据集、建立难熔高熵合金“成分-工艺-组织-性能”定量关系、实现高性能难熔高熵合金的多目标优化等。

关键词：难熔高熵合金机器学习相结构力学性能强化机理原子模拟

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

纵向梯形皮瓣螺旋式缝合预防输尿管皮肤乳头萎缩塌陷15例分析

引用

临床外科杂志 2020年第1期28卷 91-93页

作者：高重庆王刚成刘英俊化朋标李丹王有财郑州大学附属肿瘤医院普外科 450008

目的探讨利用纵向梯形皮瓣螺旋式缝合预防输尿管皮肤乳头成形术后皮瓣蒂部过紧及乳头萎缩与塌陷的疗效。方法2013年1月~2016年12月行全膀胱切除、全膀胱联合部分输尿管切除的病人15例,其中12例输尿管长度及血运良好,行双侧输尿管同侧皮... 详细信息

目的探讨利用纵向梯形皮瓣螺旋式缝合预防输尿管皮肤乳头成形术后皮瓣蒂部过紧及乳头萎缩与塌陷的疗效。方法2013年1月~2016年12月行全膀胱切除、全膀胱联合部分输尿管切除的病人15例,其中12例输尿管长度及血运良好,行双侧输尿管同侧皮肤乳头成形;3例因输尿管长度不足,行双侧输尿管同侧成形困难,双侧分别行输尿管皮肤乳头成形。结果18个乳头中,1个乳头出现塌陷,发生率为5.56%;1个乳头根部感染形成输尿管皮瓣根部瘘,发生率为5.56%;1个乳头出现一侧输尿管远端坏死,发生率为5.56%;并发症总发生率16.7%;所有病人均未出现皮瓣坏死不愈合、皮瓣蒂部过紧、乳头萎缩与严重塌陷等问题。结论对于年老体弱病人采用纵向梯形皮瓣螺旋式缝合可预防输尿管皮肤乳头成形术后皮瓣蒂部过紧及乳头萎缩与塌陷。

关键词：纵向梯形皮瓣螺旋式缝合输尿管乳头成形术

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：