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

高激光损伤阈值化学膜透射元件的研制

原子能科学技术 2014年第4期48卷 763-768页

作者：李晓光张清华沈军同济大学物理科学与工程学院上海200092 同济大学上海市特殊人工微结构材料与技术重点实验室上海200092 成都精密光学工程研究中心四川成都610041

以K9和熔石英玻璃为基底结合溶胶-凝胶镀膜技术,制备了用于负载1 064nm和355nm激光辐射的高损伤阈值透射玻璃元件。综合考虑基底表面和亚表面质量及薄膜质量,系统分析了影响激光损伤阈值的因素,并通过基底加工与薄膜改性的结合大幅提高... 详细信息

以K9和熔石英玻璃为基底结合溶胶-凝胶镀膜技术,制备了用于负载1 064nm和355nm激光辐射的高损伤阈值透射玻璃元件。综合考虑基底表面和亚表面质量及薄膜质量,系统分析了影响激光损伤阈值的因素,并通过基底加工与薄膜改性的结合大幅提高了元件的损伤阈值。在薄膜改性方面,采用溶胶内添加聚乙二醇和氨气氛处理相结合的方法,使薄膜的结构缺陷减少,孔径分布更合理,所得薄膜的抗激光损伤能力远大于未处理的基底的。在基底加工方面,采用超级抛光和化学腐蚀的方法获得了超光滑表面和低缺陷亚表面,使用于红外波段的K9玻璃和紫外波段的熔石英玻璃的激光损伤阈值分别提高到原来的1.3和4.1倍。将上述改性后的薄膜镀在改性后的基底上,所得透射元件的激光损伤阈值不小于相应基底的。

关键词：激光损伤二氧化硅薄膜溶胶-凝胶超级抛光

在线全文

学校读者我要写书评

暂无评论

多元态军事网络空间风险传播问题仿真研究

系统工程与电子技术 2019年第2期41卷 365-371页

作者：沈迪任清华王鹏朱瑞空军工程大学信息与导航学院中国人民解放军93801部队

随着军事信息通信技术的不断进步和联合作战军事信息系统的发展,由多种网络融合构成的多元态网络空间逐渐成为军事信息网络环境的主要呈现状态。在多元态军事信息网络空间中,不同元素节点对于安全风险的抵御能力、传播能力不同,单一的... 详细信息

随着军事信息通信技术的不断进步和联合作战军事信息系统的发展,由多种网络融合构成的多元态网络空间逐渐成为军事信息网络环境的主要呈现状态。在多元态军事信息网络空间中,不同元素节点对于安全风险的抵御能力、传播能力不同,单一的基于互联网模型的风险传播模型难以有效描述这种差异并真实反应风险传播规律。针对这一问题,构建多元态军事网络空间模型,通过改进经典的节点中心性计算方法,并设定节点传播因子和感染因子,实现对多元态军事网络空间节点的区分描述,并在此基础上仿真推演其传播规律,为军事网络空间风险的隔离与防控提供依据。

关键词：多元态军事网络空间安全风险传播模型

Telomere-to-telomere genome of the allotetraploid legume Sesbania cannabina reveals transposon-driven subgenome divergence and mechanisms of alkaline stress tolerance

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第1期67卷 149-160页

作者： Haofei Luo Xiaofei Wang Changqing You Xuedan Wu Duofeng Pan Zhiyao Lv Tong Li Dongmei Zhang Zhongbao shen Xiaodong Zhang Guodao Liu Kaixuan He Qingtong Ye Yajun Jia qinghua Zhao Xian Deng Xiaofeng Cao Xianwei Song Gai Huang State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Hainan Yazhou Bay Seed Lab Sanya 572025China University of Chinese Academy of Sciences Beijing 100049China Institute of Forage and Grassland Sciences Heilongjiang Academy of Agricultural SciencesHarbin 150086China Shandong Academy of Agricultural Sciences Jinan 250100China National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land Dongying 257345China Shandong Green Manure Ecological Technology Co. LtdDongying 257345China State Key Laboratory of Tropical Crop Breeding Chinese Academy of Tropical Agricultural SciencesHaikou 571101China

Alkaline soils pose an increasing problem for agriculture worldwide,but using stress-tolerant plants as green manure can improve marginal ***,we show that the legume Sesbania cannabina is very tolerant to alkaline conditions and,when used as a green manure,substantially improves alkaline *** understand genome evolution and the mechanisms of stress tolerance in this allotetraploid legume,we generated the first telomere-to-telomere genome assembly of *** spanning~2,087 *** assembly included all centromeric regions,which contain centromeric satellite repeats,and complete chromosome ends with telomeric *** genome analysis distinguished A and B subgenomes,which diverged approximately 7.9 million years *** genomic analysis revealed that the chromosome homoeologs underwent large-scale inversion events(>10 Mb)and a significant,transposon-driven size expansion of the chromosome 5A *** further identified four specific alkali-induced phosphate transporter genes in ***;these may function in alkali tolerance by relieving the deficiency in available phosphorus in alkaline *** work highlights the significance of *** as a green tool to improve marginal lands and sheds light on subgenome evolution and adaptation to alkaline soils.

关键词： Sesbania cannabina alkaline stress telomere-to-telomere genome legume green manure phosphate transporter allotetraploid

同方期刊数据库

疫情后新时代长学制基础医学拔尖人才培养模式中微生物学教学改革与思考

在线全文

学校读者我要写书评

暂无评论

微生物学通报 2024年第4期51卷 1272-1280页

作者：邹清华沈弢北京大学基础医学院北京100191

新型冠状病毒疫情全球大流行使人们深刻认识并高度重视“医学微生物学”,进而对基础医学教育提出了新的要求。本文聚焦疫情后新时代长学制基础医学拔尖人才培养模式中微生物学教学内容和教学方法,秉持“以学生为本,与时代同步”的教改理... 详细信息

新型冠状病毒疫情全球大流行使人们深刻认识并高度重视“医学微生物学”,进而对基础医学教育提出了新的要求。本文聚焦疫情后新时代长学制基础医学拔尖人才培养模式中微生物学教学内容和教学方法,秉持“以学生为本,与时代同步”的教改理念,采用多轨道教学模式,探索医学微生物学教学改革的新途径。医学微生物学教改将重新梳理教学内容,并加强微生物学与其他医学知识整合;紧跟微生物学前沿研究热点,突出新发突发传染病的病原学知识点以及生物安全和疫情防控的重要性;完善医学微生物学实验教学体系,加强创新和实践能力培养,激发学生的科研兴趣和思维。本研究可为疫情后新时代长学制基础医学拔尖人才的培养模式提供借鉴。

关键词：疫情后新时代长学制基础医学拔尖人才微生物学教学改革

“一带一路”国家文化战略背景下太极拳国际化传播策略

在线全文

学校读者我要写书评

暂无评论

武汉体育学院学报 2018年第3期52卷 61-66页

作者：宋清华申国卿河南理工大学体育(太极拳)学院河南焦作454000

采用文献资料、田野调查、专家访谈及归纳分析等方法,对"一带一路"国家文化战略背景下太极拳国际化传播的策略进行探讨,旨在为太极拳的时代价值彰显和跨国传播策略提出创新发展思路。研究认为:(1)太极拳作为中华民族文化的优秀载体,在我... 详细信息

采用文献资料、田野调查、专家访谈及归纳分析等方法,对"一带一路"国家文化战略背景下太极拳国际化传播的策略进行探讨,旨在为太极拳的时代价值彰显和跨国传播策略提出创新发展思路。研究认为:(1)太极拳作为中华民族文化的优秀载体,在我国"一带一路"战略中起着文化助力作用,但当前太极拳在跨国传播进程中面临着区域文化差异、观念认识冲突、优秀传播人才匮乏,及如何科学理性地解释太极等诸多挑战和困惑;(2)在调整和完善太极拳国际化传播策略过程中,宏观上,既要从大政方针等政策方面制定对外传播的策略,也要结合相关对策以完善和调整上层政策,微观上,政策或对策能否得到妥善执行,依赖于相关措施、手段和方法等细节工作的推进程度。(3)应理顺传播策略体系中各组成元素的关系,建立良好的信息反馈机制、疏通信息传播渠道,利于完善太极拳国际化传播的整体策略及提高其执行的质量。

关键词：一带一路文化战略太极拳国际化传播

Gas-phase synthesis of Ti_(2)CCl_(2) enables an efficient catalyst for lithiumsulfur batteries

在线全文

学校读者我要写书评

暂无评论

The Innovation 2024年第1期5卷 33-40页

作者： Maoqiao Xiang Zihan shen Jie Zheng Miao Song Qiya He Yafeng Yang Jiuyi Zhu Yuqi Geng Fen Yue qinghua Dong Yu Ge Rui Wang Jiake Wei Weiliang Wang Haiming Huang Huigang Zhang Qingshan Zhu Chuanfang John Zhang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of the Chinese Academy of SciencesBeijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China China Nuclear Power Engineering Co. Ltd.117 West Third Ring RoadNorth SectionBeijing 100840China College of Materials Science&Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China School of Physics Guangdong Province Key Laboratory of Display Material and TechnologyCenter for Neutron Science and TechnologySun Yat-sen UniversityGuangzhou 510275China Solid State Physics&Material Research Laboratory School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China

MXenes have aroused intensive enthusiasm because of their exotic properties and promising ***,to date,they are usually synthesized by etching *** synthetic technologies provides more opportunities for innovation and may extend unexplored ***,we report a bottom-up gas-phase synthesis of Cl-terminated MXene(Ti_(2)CCl_(2)).The gas-phase synthesis endows Ti_(2)CCl_(2) with unique surface chemistry,high phase purity,and excellent metallic conductivity,which can be used to accelerate polysulfide conversion kinetics and dramatically prolong the cyclability of Li-S ***-depth mechanistic analysis deciphers the origin of the formation of Ti_(2)CCl_(2) and offers a paradigm for tuning MXene chemical vapor *** brief,the gas-phase synthesis transforms the synthesis of MXenes and unlocks the hardly achieved potentials of MXenes.

关键词： synthesis phase lithium

Spectrum of Cytogenomic Abnormalities Revealed by Array Comparative Genomic Hybridization on Products of Conception Culture Failure and Normal Karyotype Samples

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

Spectrum of Cytogenomic Abnormalities Revealed by Array Comp...

Rail Fatigue Crack Classification Based on Improved DPC Algorithm Using Acoustic Emission Technology

第十四次全国医学遗传学学术会议

作者： qinghua Zhou shen-Yin Wu Katherine Amato Autumn Diadamo Peining Li The First Affiliated Hospital The Biomedical Translational Research InstituteJinan University Department of Genetics Yale University School of Medicine

Approximately 30%of pregnancies after implantation end up in spontaneous abortions,and 50%of them are caused by chromosomal ***,the spectrum of genomic copy number variants(CNVs)in products of conception(POC)and the underlying gene-dosage-sensitive mechanisms causing spontaneous abortions remain largely *** this study,array comparative genomic hybridization(aCGH)analysis was performed as a salvage procedure for 128 POC culture failure(POC-CF)samples and as a supplemental procedure for 106 POC normal karyotype(POC-NK)*** abnormalities were detected in 10%of POC-CF and pathogenic CNVs were detected in 3.9%of POC-CF and 5.7%of POC-NK *** results from this study and relevant case series through a literature review demonstrated an abnormality detection rate(ADR)of 35%for chromosomal abnormalities in POCCF,3.7%for pathogenic CNVs in POC-CF,and 4.6%for pathogenic CNVs in *** Ingenuity Pathway Analysis(IPA)was performed on the gene content from pathogenic CNVs found in POC *** denoted primary gene networks suggested that apoptosis and cell proliferation pathways are involved in *** summary,a similar spectrum of cytogenomic abnormalities was observed in POC culture success and POC-CF samples.A threshold effect correlating the number of dosage-sensitive genes in a chromosome with the observed frequency of autosomal trisomy is proposed.A rationalized approach using firstly FISH testing with probes of chromosomes X/Y/18,13/21,and 15/16/22 for common aneuploidies and polyploidies and secondly aCGH for other cytogenomic abnormalities is recommended for POC-CF samples.

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

Rail Fatigue Crack Classification Based on Improved DPC Algo...

无维护下极低使用占空比装备贮存使用阶段备件配置优化

第43届中国控制会议

作者： qinghua Song Xin Zhang Jiazhong Cui Yongqi Chang Shuzhi Song Yi shen Department of Control Science and Engineering Harbin Institute of Technology

The effective classification of crack,as a key aspect in maintaining rail safety,plays a significant role in ensuring the reliable operation of high-speed *** are mainly supervised and unsupervised algorithms for classification *** learning algorithms require a large amount of labeled data and have limited generalization capability,and unsupervised learning algorithms have low classification *** address these shortcomings,a multi-center density peak clustering based on the multi-layered weight density(MDPC-MWD) is proposed to classify rail cracks more efficiently using acoustic emission *** information of different rail cracks is comprehensively reflected by studying the entropy feature of the signals from the perspective of singular ***,an improved multi-layered weight density is proposed to address the uneven density distribution of the crack ***,the classification results are obtained through micro-cluster self-recognition and self-merging *** method is demonstrated in the rail fatigue experiments,and the results show that the proposed MDPC-MWD method achieve outstanding classification performance.

关键词： Acoustic Emission Rail Crack Classification Density Peak Clustering Uneven Density Distribution Multiple Peaks

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

系统工程与电子技术 2018年第10期40卷 2270-2275页

作者：彭英武周亮王慎曾庆华海军工程大学兵器工程学院湖北武汉430033 海军工程大学舰船综合电力国防科技重点实验室湖北武汉430033 海军91962部队上海201900 中国人民公安大学情报理论教研室北京100038

针对当前舰艇装备备件配置均按常用装备、未考虑极低使用占空比装备不工作期间失效的不合理情况,对极低使用占空比装备不使用期间因部件故障对任务期间备件配置影响展开了研究。通过引入虚拟站点,将装备不使用期间等效转换为装备使用期... 详细信息

针对当前舰艇装备备件配置均按常用装备、未考虑极低使用占空比装备不工作期间失效的不合理情况,对极低使用占空比装备不使用期间因部件故障对任务期间备件配置影响展开了研究。通过引入虚拟站点,将装备不使用期间等效转换为装备使用期间的状态,以装备可靠度为指标,建立了任务期间装备贮存-使用的可靠度模型。以装备可靠度为约束,基于边际优化算法建立了舰艇装备备件配置优化模型;并依据备件保障流程,基于蒙特卡罗方法搭建了仿真模型。通过案例分析可知:对于极低使用占空比装备,考虑装备不使用期间部件失效的备件比不考虑装备贮存失效的备件要多,且模型的正确性通过仿真方法得到验证。模型可为舰艇上极少使用、长期贮存的装备制定备件方案提供参考。

关键词：备件极低使用占空比等效转换可靠度边际