检索结果-南通市图书馆

Radiation protection in the design of λ-ray industrial computed tomography systems

Nuclear Science and Techniques 2016年第4期27卷 174-180页

作者： Ri-Feng zhou xiao-jian zhou xiao-Bin Li Ping Li The Key Laboratory for Opto-electronic Technology and Systems of Ministry of Education ICT Research Center University of Chongqing Chongqing 400044 China Nuclear and Radiation Safe Center Ministry of Environmental Protection of People's Republic of China Beijing 100082 China Environmental Protection Agency of Chongqing Chongqing 401147 China

The recent increasing use of γ-rays industrial computed tomography(γ-rays ICT) in various fields has induced greater attention to its performance as well as to considerations of radiation safety. It is understood that radiation protection planning cannot be sacrificed for the sake of CT image quality during the design, manufacture,and layout of γ-rays ICT systems. In the present work, we describe a typical γ-rays ICT system in brief, and, based on experience and pertinent examples, we propose design requirements for ensuring the radiation safety of the sealed radioactive source, source container, and workspace. The design examples and dose rate measurement results illustrate that the proposed design standards are reasonable,feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems. This paper discussed the predominant measures associated with the radiation protection of γ-rays ICT systems in accordance with the pertinent Chinese standards. In addition, based on experience and pertinent examples, the design requirements for ensuring the radiation safety of a sealed radioactive source, source container, and workspace were defined in detail. The design examples and dose rate measurements conducted in conjunction with a γ-rays ICT system and workspace employing the proposed design standards have illustrated that the proposals provided in this paper are reasonable, feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems.

关键词：工业CT系统设计实例辐射防护密封放射源评估测定设计标准 γ射线

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

Activator protein-1 involved in growth inhibition by RASSF1A gene in the human gastric carcinoma cell line SGC7901

引用

World Journal of Gastroenterology 2008年第9期14卷 1437-1443页

作者： Zheng-Hao Deng Ji-Fang Wen Jing-He Li De-Sheng xiao jian-Hua zhou Department of Pathology Xiangya School of Medicine Central South University Changsha 410078 Hunan Province China

AIM:To investigate the role of Ras association domain family protein 1 isoform A (RASSF1A) in gastric tumorigenesis. METHODS:Through over-expression of RASSF1A gene in the SGC7901 cell line which was induced by a lipofectamine-mediated gene transfer approach. Activator protein-1 (AP-1) DNA binding activity was measured by electrophoretic mobility shift assay (EMSA). RESULTS:Compared with the control clones, cells over- expressing RASSF1A exhibited significant inhibition of cell growth with G1 cell cycle arrest in vitro and in vivo. The over-expression of RASSF1A significantly inhibited AP-1 activity in SGC7901 cells (0.981±0.011 vs 0.354±0.053, P<0.001). In addition, both Western blot analysis and immunocytochemistry demonstrated that RASSF1A down-regulated the expression of c-Fos (0.975± 0.02 vs 0.095±0.024, P<0.001) but not c-Jun. CONCLUSION: Over-expression of RASSF1A inhibits the growth of SGC7901 cells by negatively regulating the AP-1 activity, the latter in turn negatively signals cell proliferation.

关键词： RASSFIA Gastric adenocarcinoma SGC7901, Activator protein-1

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

Best practice for infection prevention in pediatric respiratory clinics during the COVID‑19 epidemic

引用

World Journal of Pediatrics 2020年第4期16卷 326-332页

作者： Jing Zhang Lei Zhang Yong Yin Quan Lu jian‑Guo Hong xiao‑Bo Zhang xiao‑jian zhou Li‑Bo Wang jian‑Hua Zhang Min Lu xiao‑Yan Dong Jie Shao Yan‑Ming Lu Jun Yu Li Gu Respiratory Disease Group,Pediatric Committee of Shanghai Medical Association,Shanghai,China Department of Respiratory Medicine Shanghai Children’s Medical CenterShanghai Jiao Tong University School of MedicineNo.1678 Dongfang RoadShanghaiChina Department of Respiratory Medicine Children’s Hospital of Shanghai Jiao Tong UniversityShanghaiChina Department of Pediatrics Shanghai General HospitalShanghai Jiao Tong UniversityShanghaiChina Department of Respiratory Medicine Children’s Hospital of Fudan UniversityShanghaiChina Department of Respiratory Medicine XinHua HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Department of Pediatrics Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Department of Pediatrics Renji HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Department of Pediatrics Shanghai FengXian District Central HospitalShanghaiChina Department of Pediatrics Shanghai Tenth People’s HospitalTong Ji UniversityShanghaiChina 不详

During the COVID-19 epidemic,it is important for ensuring infection prevention and control in the pediatric respiratory ***,we introduced the practice of infection prevention and control in pediatric respiratory clinics in *** measures for patients who visit respiratory clinics,quality control for pediatric respiratory clinics and other preventive measures for related examinations and treatment have been introduced in this review article.

关键词： prevention pediatric respiratory

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

Efficacy and safety of salmeterol/fluticasone compared with montelukast alone (or add-on therapy to fluticasone) in the treatment of bronchial asthma in children and adolescents: a systematic review and meta-analysis

引用

Chinese Medical Journal 2021年第24期134卷 2954-2961页

作者： xiao-jian zhou Zhen Qin Jiao Lu jian-Guo Hong Department of Paediatrics Shanghai General HospitalShanghai Jiaotong UniversityShanghai 200080China

Background:Despite the recommendation of inhaled corticosteroids(ICSs)plus long-acting beta 2-agonist(LABA)and leukotriene receptor antagonist(LTRA)or ICS/LTRA as stepwise approaches in asthmatic children,there is a lack of published systematic review comparing the efficacy and safety of the two therapies in children and adolescents aged 4 to 18 *** study aimed to compare the safety and efficacy of salmeterol/fluticasone(SFC)***(MON),or combination of montelukast and fluticasone(MFC)in children and adolescents aged 4 to 18 years with bronchial ***:A systematic search was conducted in MEDLINE,EMBASE,the Cochrane Library,China BioMedical Literature Database,Chinese National Knowledge Infrastructure,VIP Database for Chinese Technical Periodical,and Wanfang for randomized controlled trials(RCTs)published from inception to May 24,*** are as follows:SFC ***,or combination of MFC,with no limitation of dosage or *** and secondary outcome measures were as follows:the primary outcome of interest was the risk of asthma *** outcomes included risk of hospitalization,pulmonary function,asthma control level,quality of life,and adverse events(AEs).A random-effects(I^(2)≥50%)or fixed-effects model(I^(2)<50%)was used to calculate pooled effect estimates,comparing the outcomes between the intervention and control groups where ***:Of the 1006 articles identified,21 studies met the inclusion criteria with 2643 individuals;two were at low risk of *** no primary outcomes were similar after an identical treatment duration in the included studies,meta-analysis could not be ***,more studies favored SFC,instead of MON,owing to a lower risk of asthma exacerbation in the SFC *** for secondary outcome,SFC showed a significant improvement of peak expiratory flow(PEF)%pred after 4 weeks compared with MFC(mean difference[MD]:5.45;95%confidence interval[CI]:1.57-9.34;I^(2)=95%;P=0.006).

关键词： Bronchial asthma Fluticasone/salmeterol Montelukast Systematic review Pediatric

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

Genetic structure,gene flow pattern,and association analysis of superior germplasm resources in domesticated upland cotton(Gossypium hirsutum L.)

引用

Plant Diversity 2020年第3期42卷 189-197页

作者： Ting-Ting Zhang Na-Yao Zhang Wei Li xiao-jian zhou xiao-Yu Pei Yan-Gai Liu Zhong-Ying Ren Kun-Lun He Wen-Sheng Zhang Ke-Hai zhou Fei Zhang Xiong-Feng Ma Dai-Gang Yang Zhong-Hu Li Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationCollege of Life SciencesNorthwest UniversityXi'an710069China State Key Laboratory of Cotton Biology Institute of Cotton ResearchChinese Academy of Agricultural SciencesAnyang455000China

Gene flow patterns and the genetic structure of domesticated crops like cotton are not well ***,marker-assisted breeding of cotton has lagged far behind that of other major crops because the loci associated with cotton traits such as fiber yield and quality have scarcely been *** this study,we used 19 microsatellites to first determine the population genetic structure and patterns of gene flow of superior germplasm resources in upland *** then used association analysis to identify which markers were associated with 15 agronomic traits(including ten yield and five fiber quality traits).The results showed that the upland cotton accessions have low levels of genetic diversity(polymorphism information content=0.427),although extensive gene flow occurred among different ecological and geographic *** clustering analysis indicated that the cotton resources used in this study did not belong to obvious geographic populations,which may be the consequence of a single source of domestication followed by frequent genetic introgression mediated by human transference.A total of 82 maker-trait associations were examined in association analysis and the related ratios for phenotypic variations ranged from 3.04% to 47.14%.Interestingly,nine SSR markers were detected in more than one environmental *** addition,14 SSR markers were co-associated with two or more different *** was noteworthy that NAU4860 and NAU5077 markers detected at least in two environments were simultaneously associated with three fiber quality traits(uniformity index,specific breaking strength and micronaire value).In conclusion,these findings provide new insights into the population structure and genetic exchange pattern of cultivated cotton *** quantitative trait loci of domesticated cotton identified will also be very useful for improvement of yield and fiber quality of cotton in molecular breeding programs.

关键词： Domestication cotton Fiber quality traits Genetic exchange Microsatellite markers Yield

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

Prussian Blue Analogue‑Templated Nanocomposites for Alkali‑Ion Batteries:Progress and Perspective

引用

Nano-Micro Letters 2025年第1期17卷 216-261页

作者： jian‑En zhou Yilin Li xiaoming Lin Jiaye Ye Key Laboratory of Theoretical Chemistry of Environment Ministry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006People’s Republic of China School of Chemistry and Physics Faculty of ScienceQueensland University of Technology2 George StreetBrisbaneQLD 4000Australia Centre for Materials Science Queensland University of Technology2 George StreetBrisbaneQLD 4000Australia

Lithium-ion batteries(LIBs)have dominated the portable electronic and electrochemical energy markets since their commercialisation,whose high cost and lithium scarcity have prompted the development of other alkali-ion batteries(AIBs)including sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).Owing to larger ion sizes of Na^(+)and K^(+)compared with Li^(+),nanocomposites with excellent crystallinity orientation and well-developed porosity show unprecedented potential for advanced lithium/sodium/potassium *** enticing open rigid framework structures,Prussian blue analogues(PBAs)remain promising self-sacrificial templates for the preparation of various nanocomposites,whose appeal originates from the well-retained porous structures and exceptional electrochemical activities after thermal *** review focuses on the recent progress of PBA-derived nanocomposites from their fabrication,lithium/sodium/potassium storage mechanism,and applications in AIBs(LIBs,SIBs,and PIBs).To distinguish various PBA derivatives,the working mechanism and applications of PBA-templated metal oxides,metal chalcogenides,metal phosphides,and other nanocomposites are systematically evaluated,facilitating the establishment of a structure–activity correlation for these *** on the fruitful achievements of PBA-derived nanocomposites,perspectives for their future development are envisioned,aiming to narrow down the gap between laboratory study and industrial reality.

关键词： Prussian blue analogues Self-sacrificial template Lithium-ion batteries Sodium-ion batteries Potassium-ion batteries

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

多级框架锚索和抗滑桩联合作用下边坡抗震性能的振动台试验研究

引用

岩土力学 2017年第2期38卷 462-470页

作者：付晓张建经周立荣西南交通大学土木工程学院四川成都610031 西南交通大学交通隧道工程教育部重点实验室四川成都610031

基于原型边坡设计了大型振动台模型试验,通过监测锚索轴力、桩身土压力、坡体加速度和坡面位移时程,研究多级锚索框架梁与双排抗滑桩组合结构加固含软弱夹层岩质边坡的地震动力特性。试验结果表明:在0.15g El Centro地震波激振时锚索预... 详细信息

基于原型边坡设计了大型振动台模型试验,通过监测锚索轴力、桩身土压力、坡体加速度和坡面位移时程,研究多级锚索框架梁与双排抗滑桩组合结构加固含软弱夹层岩质边坡的地震动力特性。试验结果表明:在0.15g El Centro地震波激振时锚索预应力产生损失,最大损失比为23%,建议对变形等级要求较高的边坡在锚索抗震设计时适当提高预应力初始值1.2~1.3倍;沿边坡不同高度布置的锚索其轴力响应峰值几乎同一时刻到达,而峰值增加比例呈现出空间非一致性,在锚索抗震设计时应以坡体中部抗滑桩为界将边坡分为上、下区分别考虑;坡脚抗滑桩受荷段、锚固段土压力均随着输入地震波峰值加速度的增加而增大,主动土压力分布规律将由"上小下大"转变成"上大下小"的形状,被动土压力Ⅰ、Ⅱ区的分界点将向桩体下部发展;锚索与抗滑桩在地震时表现为协同工作机制,工程设计中要充分考虑地震效应对桩锚下滑力分担比的影响。该研究成果可为更加合理地考虑地震区锚索框架梁与抗滑桩组合支护结构的设计提供指导。

关键词：锚索预应力损失协同工作抗滑桩抗震设计

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

固体火箭推进剂的模拟低温点火冲击试验加载方法研究

引用

兵工学报 2018年第4期39卷 717-723页

作者：张怀龙菅晓霞周伟良肖乐勤南京理工大学化工学院江苏南京210094

固体火箭推进剂低温下点火瞬间高速加载的耦合作用可能会导致推进剂结构发生破坏,针对此问题,利用推进剂中止熄火的原理,设计了一种中止压力可控模拟点火冲击试验装置,以点火药燃烧产生的燃气对推进剂进行模拟点火冲击。点火压力根据药... 详细信息

固体火箭推进剂低温下点火瞬间高速加载的耦合作用可能会导致推进剂结构发生破坏,针对此问题,利用推进剂中止熄火的原理,设计了一种中止压力可控模拟点火冲击试验装置,以点火药燃烧产生的燃气对推进剂进行模拟点火冲击。点火压力根据药室容积和点火药量之间的计算公式确定,中止压力通过爆破片破片压力控制。通过对点火冲击过程的压力与时间和升压速率与时间关系曲线分析,得知点火压力和点火方式对点火药燃气的升压速率影响较大。多次重复试验表明:该加载方法中止压力可控,压力偏差<±5%;弱点火时升压速率为2 000 MPa/s,强点火时升压速率达到5 000 MPa/s,高于通常发动机点火的升压速率;可作为固体火箭推进剂模拟低温点火冲击的研究手段。

关键词：固体火箭推进剂点火冲击低温升压速率

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

Observation of topological charge transformations in acoustic vortex using passive periodic systems

引用

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 140-147页

作者： Di-Chao Chen Xie Liu Changqing Xu Da-jian Wu Ying Cheng xiao-Jun Liu School of Physics and Technology Nanjing Normal University Key Laboratory of Modern Acoustics School of Physics Nanjing University

Vortex transmutation utilizes a periodic system, which not only enables the alteration of the topological charge(TC) of unstable input vortices but also facilitates their transformation into stable structures. This approach is crucial for investigating the characteristics of vortices in various wave systems. Here, we achieve acoustic vortex TC transmutation by employing a welldesigned dual-structured plate external system(DPES). The interactions between the acoustic vortex and the finite-order discrete rotational symmetry lead to the transformation of its topological charge when complete rotational symmetry is broken to Nthorder discrete symmetry. Our results experimentally demonstrate the acoustic vortex TC transmutation based on passive artificial structures, enabling numerous applications in particle manipulation and information multiplexing as well as advancing our understanding and control over free-space acoustic vortices.

关键词： acoustic vortex topological charge transformation artificial structure

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

葛粉与粳米粉复配挤压方便米饭流变学特性研究

引用

食品科技 2016年第11期41卷 160-163页

作者：马晓灵周坚武汉轻工大学食品学院武汉430023

采用动态流变仪对双螺杆二次挤压法制得的粳米-葛粉复合米的流变特性进行了研究。研究结果表明:双螺杆二次挤压法制得的挤压米具有高糊化度,二次糊化后降温过程的温度扫描表明挤压米不易回生。葛粉的添加能进一步提高挤压米的抗回生能力... 详细信息

采用动态流变仪对双螺杆二次挤压法制得的粳米-葛粉复合米的流变特性进行了研究。研究结果表明:双螺杆二次挤压法制得的挤压米具有高糊化度,二次糊化后降温过程的温度扫描表明挤压米不易回生。葛粉的添加能进一步提高挤压米的抗回生能力,12%的葛粉配比能获得更优越的黏弹性。

关键词：葛粉粳米粉方便米饭流变学特性

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：