检索结果-南通市图书馆

Enhanced conductivity and weakened magnetism in Pb-doped Sr2IrO4

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第1期33卷 696-701页

作者：岳智来甄伟立牛瑞焦珂珂朱文卡皮雳张昌锦 High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of Sciences Science Island Branch of Graduate School University of Science and Technology of China Collaborative Innovation Center of Advanced Microstructures Nanjing University

Group IV element Pb has been selected as the dopant to dope at the Sr site of Sr2IrO4. It is exciting to find that the single-phase crystal structure could be maintained with a high Pb doping level of up to x=0.3 in Sr2-xPbxIrO4. The mapping data obtained from energy-dispersive x-ray spectroscopy analyses give solid evidence that the Pb ions are uniformly distributed in the Sr2IrO4matrix. The incorporation of Pb leads to a moderate depression of the canted antiferromagnetic ordering state. The electrical conductivity could be greatly enhanced when the Pb doping content is higher than x=*** present results give a fresh material base to explore new physics in doped Sr2IrO4systems.

关键词： iridates doping conductivity magnetism

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

京津冀区域日常人口流动网络及其结构特征

城市观察 2024年第1期89卷 86-99,161,162页

作者：杨卡国际关系学院公共管理系

结合地理空间分析和社会网络分析方法,基于2018年腾讯出行大数据,对京津冀区域内城市间及对区外人口流动的热度和网络特征进行分析。结果显示:京津冀区域主要城市的对外迁移热度呈现显著的层级分布特征;城市规模和交通影响力与对京联系... 详细信息

结合地理空间分析和社会网络分析方法,基于2018年腾讯出行大数据,对京津冀区域内城市间及对区外人口流动的热度和网络特征进行分析。结果显示:京津冀区域主要城市的对外迁移热度呈现显著的层级分布特征;城市规模和交通影响力与对京联系强度的关联性较强,距离邻近性对第二层级城市对外联系的影响较大;汽车方式的对外人口流动网络受距离律影响显著,与周边城市联系热度较高;飞机、火车等对外联系方式则更符合经济律特征,区域内城市通过飞机和火车方式与全国性经济中心、交通枢纽联系紧密;区内人口流动网络形成以北京为中心的北部大凝聚子群以及东部、南部的3个小凝聚子群,群内联系紧密;区域人口迁移网络以北京—廊坊—天津为核心,以“京津石三角形”区域为密集区。

关键词：京津冀人口流动区域人口格局

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

动态虚拟患者技术在口腔修复领域的应用进展

中华口腔医学杂志 2024年第3期59卷 267-273页

作者：高雨童撒悦杨静文武汉大学口腔医(学)院修复科、口颌系统重建与再生全国重点实验室、口腔生物医学教育部重点实验室、口腔医学湖北省重点实验室武汉430079 北京大学口腔医学院·口腔医院修复科、国家口腔医学中心、国家口腔疾病临床医学研究中心、口腔生物材料和数字诊疗装备国家工程研究中心、口腔数字医学北京市重点实验室北京100081

随着面部扫描、口内扫描、虚拟面弓、下颌运动轨迹记录等技术在口腔修复领域的发展及应用,动态虚拟患者技术逐渐被应用于口腔修复的术前分析、美学诊断、治疗设计及修复体制作,并成为近年的研究热点。本文从口腔动静态数据获取、动态口... 详细信息

随着面部扫描、口内扫描、虚拟面弓、下颌运动轨迹记录等技术在口腔修复领域的发展及应用,动态虚拟患者技术逐渐被应用于口腔修复的术前分析、美学诊断、治疗设计及修复体制作,并成为近年的研究热点。本文从口腔动静态数据获取、动态口腔虚拟患者的构建、动态口腔虚拟患者的应用优势等方面对动态虚拟患者技术在口腔修复领域中的应用和研究展开综述,以期为相关数字化技术的临床应用提供参考。

关键词：计算机辅助设计牙修复体设计义齿修复术动态虚拟患者

Resection of Intracranial Giant Cavernous Malformation: Case Report and Literature Review

在线全文

学校读者我要写书评

暂无评论

Surgical Science 2024年第2期15卷 28-35页

作者： Vinicios Rivelli Da Fonseca Cleverson Martins Kill Mariana Alcantara Hugo Fialho Leonnan De sa Oliveira Lucidio Souza Filho Department of Neurosurgery Hospital Santa Rita Belo Horizonte Brazil

Cerebral cavernous malformations are a rare and congenital vascular malformation that can present as a challenge in neurosurgical management. The term “giant cerebral cavernous malformations” still does not have a clear definition in the literature, with a wide variety of results. It is known, however, that there is an association between the size of the cavernoma and postoperative sequelae, especially in those with a size greater than 3 cm in its largest diameter. We present a case report of resection of a giant brain cavernoma measuring approximately 8 cm in its largest diameter, emphasizing on clinical presentation, diagnoses and postoperative evolution. Additionally, we performed a comprehensive review of the existing literature on the subject, addressing the epidemiology, pathophysiology, diagnostic methods, treatment options, and prognosis associated with this condition.

关键词： Cavernous Malformation Cerebral Cavernous Malformation Giant Cavernous Malformation Cavernous Hemangioma Cavernous Angioma Cavernoma Giant Cavernoma

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

核级截止阀抗冲击性能数值分析

阀门 2024年第4期 454-459页

作者：查洒洒赵晶沈阳工业大学机械工程学院辽宁沈阳110870

为确保对核级截止阀的抗冲击性能进行全面而准确的评估,以核级截止阀为对象,分别采用动力学设计法(DDAM)和时域模拟法在频域和时域上对核级截止阀进行抗冲击计算分析。首先计算截止阀分别在纵向、垂向和横向三个方向上的频域和时域冲击... 详细信息

为确保对核级截止阀的抗冲击性能进行全面而准确的评估,以核级截止阀为对象,分别采用动力学设计法(DDAM)和时域模拟法在频域和时域上对核级截止阀进行抗冲击计算分析。首先计算截止阀分别在纵向、垂向和横向三个方向上的频域和时域冲击载荷,然后对截止阀的抗冲击特性进行仿真计算,得到截止阀三个方向上的位移及应力分布。两种方法计算结果表明,截止阀的阀体两侧拐角部位是截止阀在冲击载荷下的薄弱部分。同时,截止阀对冲击载荷的响应与冲击加载方向有很大关系,截止阀响应的特性都以横向响应为主,要对横向抗冲击设计重点考虑。

关键词：核级截止阀 DDAM方法时域模拟法抗冲击分析

Research Progress of Volatile Substances Analysis and Sensory Evaluation of Soymilk

在线全文

学校读者我要写书评

暂无评论

Journal of Northeast Agricultural University(English Edition) 2024年第1期31卷 74-82页

作者： Xu Qiongyuan Li ka Huang Meina Liang Yuxin Tao Bingjie Zhang Tingting Song Nannan Ji Yazhou Zhang Huajiang Xia Ning College of Food Science Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Soybean Biology Northeast Agricultural UniversityHarbin 150030China

Soybean is one of the important crops in China. Soymilk, a traditional neutral plant-based protein drink, is rich in high quality proteins. Although soybean milk is rich in nutrients, its marketing among consumers, especially those in Western countries who are used to peaceful flavor, has been limited due to the adverse flavor impact brought by its special composition. In recent years, with the increasing attention to the nutritional value of soymilk, the flavor of soymilk has become a popular research object for scholars at home and abroad. The flavor components of soymilk are mainly volatile small molecular compounds produced by enzymatic reactions catalyzed by lipoxygenase(LOX). After formation, they interact with protein macromolecules to form the overall flavor of soymilk. At present, there are many methods to control the off-odor of soymilk at home and abroad, including physical heating methods, chemical methods, biological enzymatic digestion methods, mask methods, and a variety of breeding methods. These methods effectively reduce the off-odor of soymilk, but all of them have shortcomings. Currently, the sensory characteristics of the beany odor in soymilk are evaluated mainly by traditional human sensory scoring along with the assistance of modern instrument analysis of volatile flavor substances using headspace solid phase microextraction(SPME) gas chromatography coupled with-mass spectrometry(GC-MS). This paper summarized the research results of volatile flavor substances in soymilk in recent years and the sensory evaluation methods of soymilk at home and abroad, and looked forward to the future development direction, hoping to provide some theoretical bases and reference detection methods for solving the problem of soymilk flavor in the future.

关键词： soymilk off-odor volatile substance flavor sensory evaluation

The multi-peak point phenomenon of broadband microwave reflection caused by inhomogeneous plasma

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第7期26卷 1-11页

作者：杨敏齐凯旋杨玖文贾飒刘浩岩陈燕扬李瑾李小平 School of Aerospace Science and Technology Xidian UniversityXi’an 710071People’s Republic of China Taiyuan satellite Launch Center Taiyuan 030173People’s Republic of China Beijing Institute of Nearspace Vehicle’s Systems Engineering Beijing 100076People’s Republic of China

During spacecraft re-entry,the challenge of measuring plasma sheath parameters directly contributes to difficulties in addressing communication *** this work,we have discovered a phenomenon of multiple peaks in reflection data caused by the inhomogeneous *** results show that the multi-peak points fade away as the characteristic frequency is approached,resembling a series of gradually decreasing *** positions and quantities of these points are positively correlated with electron density,yet they show no relation to collision *** phenomenon is of significant reference value for future studies on the spatial distribution of plasmas,particularly for using microwave reflection signals in diagnosing the plasma sheath.

关键词： plasma sheath microwave reflection inhomogeneous plasma

在线全文

学校读者我要写书评

暂无评论

深度学习赋能课堂提质增效的机理与路径研究

中国教育学刊 2024年第3期 70-75页

作者：李奇李飒卜彩丽河南师范大学教育学部河南新乡453007

教育高质量发展背景下,如何实现课堂教学的“质效双增”,已经成为基础教育领域关注的热点话题。从深度学习理论出发,通过阐明深度学习的内涵和发生机制,结合提质增效提出的背景,探明深度学习赋能提质增效的内在机理:深度学习通过激发学... 详细信息

教育高质量发展背景下,如何实现课堂教学的“质效双增”,已经成为基础教育领域关注的热点话题。从深度学习理论出发,通过阐明深度学习的内涵和发生机制,结合提质增效提出的背景,探明深度学习赋能提质增效的内在机理:深度学习通过激发学生的内在学习动机,促进其主动投入,进行有意义学习,并采用深层学习方式深度参与、体验感知、批判理解和创新应用,实现高效学习和深层学习,由此有效解决了现实课堂中学生被动、机械、低效和浅层学习问题,达成提质增效的目的。在此基础上,以深度学习理念为本,提出了面向四类课堂提质增效的深度学习生态系统模式,为实现课堂提质增效提供了全方位、多层次、宽领域的实践路径。

关键词：深度学习教育高质量发展提质增效课堂教学

在线全文

学校读者我要写书评

暂无评论

语体语法视角下中文专业学生文言素养研究

黑龙江教育（理论与实践） 2024年第7期 42-47页

作者：王飒信阳学院文学院河南信阳464000

文言素养是学生综合素质的重要组成部分,而庄典度的大小反映文言素养的高低。文章从语体语法视角探究文言素养,以中文专业学生的文言文作品为研究对象,在分词和词汇语体标注的基础上,统计不同语体词汇出现的频次和所占比重,按照比重大... 详细信息

文言素养是学生综合素质的重要组成部分,而庄典度的大小反映文言素养的高低。文章从语体语法视角探究文言素养,以中文专业学生的文言文作品为研究对象,在分词和词汇语体标注的基础上,统计不同语体词汇出现的频次和所占比重,按照比重大小排序为“通用语体词汇>庄典语体词汇>正式语体词汇>非正式语体词汇”,并在此基础上归纳当前中文专业学生文言素养特征,基于特征分析影响中文专业学生文言素养的因素,进而从需求、课程、学生、教师教学、考核等角度探究提升中文专业学生文言素养的策略。

关键词：语体文言素养庄典语体标注

维普期刊数据库博看期刊