检索结果-南通市图书馆

Particulate matter capturing over manganese dioxides with different crystal structures

Journal of Environmental Sciences 2023年第5期127卷 667-677页

作者： Rui Liu huan-huan Yang Hao zhou Xianliang Yi Yang Liu Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Ocean Science and TechnologyDalian University of TechnologyPanjin 124221China

Particulate matter(PM)is the main contributor to air pollution,and filtration has been reported to be promising for PM *** the complexity of polluted air(volatile organic compounds(VOCs)and ozone are likely concomitant with PM particles)and in view of the versatility of MnO_(2) for the degradation of VOCs and ozone,the feasibility of MnO_(2) materials as PM filteringmediawas investigated in this study,and the effect of crystal structure on PM filtration was *** with the layeredδ-MnO_(2),the MnO_(2) with tunnel structure(including 1×2-,2×2-and 3×3-MnO_(2))exhibited greatly enhanced PM removal efficiencies,and particularly,the 3×3-MnO_(2) possessed not only significant activity for adsorbing PM particles but also high utilization efficiency of the active *** properties of the adsorbents were studied by XRD,ATR,isothermal N_(2) adsorption,SEM and(HR)*** correlation between pore characteristics and particle elimination activity demonstrates that the most developed mesoporous structure of the 3×3-MnO_(2) sample played an important role in strengthening the PM adsorption *** comparison of the surface properties of the fresh and spent samples reveals that with respective to the occasion ofδ-MnO_(2),the structure of 3×3-MnO_(2) was robust enough to resist collapse after PM capturing and the great accommodation of the inorganic and organic PM substances in the voluminous pores induced strong affinity between PM particles and 3×3-MnO_(2).Thereby,a higher particle filtration ability was retained.

关键词： Particulate matter filtration Manganese oxides Crystal structure Pore structure

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

结膜松弛症定量定位切除术的临床疗效观察

引用

国际眼科杂志 2010年第4期10卷 683-686页

作者：李青松张兴儒郑一仁项敏泓周欢明张振永张桂丽上海中医药大学附属普陀医院眼科中国上海市200062 同济大学附属第十人民医院眼科中国上海市200072

目的:为了寻求安全、简便、经济、有效切除结膜松弛症的手术方法,评价结膜松弛症定量定位切除术和新月形切除术的临床疗效。方法:采用前瞻性随机分组对照研究方法,将2008-01/2009-05在上海中医药大学附属普陀医院眼科按照结膜松弛症诊... 详细信息

目的:为了寻求安全、简便、经济、有效切除结膜松弛症的手术方法,评价结膜松弛症定量定位切除术和新月形切除术的临床疗效。方法:采用前瞻性随机分组对照研究方法,将2008-01/2009-05在上海中医药大学附属普陀医院眼科按照结膜松弛症诊断标准入选手术治疗患者30例30眼按患者入选编号末位数的奇偶数随机分为两组。奇数组行结膜定量定位切除术15例15眼;偶数组行结膜新月形切除术手术15例15眼。手术后第2,4,8wk分别随访患者症状改善程度,裂隙灯观察结膜松弛症变化情况,测量泪河、BUT,氯霉素眼液尝味试验。结果:结膜松弛症定量定位切除仪和结膜新月形切除术组术后4wk,两组症状改善有效率均为87%,无差异。结膜定量定位切除术松弛结膜完全消除,占87%;结膜新月形切除术组松弛结膜完全消除,占73%,差异无统计学意义(χ2=0.833,P=0.361)。结膜定量定位切除术后4wk泪河恢复正常者,占87%,BUT≥10s者,占73%,氯霉素眼液尝味试验阳性者,占53%。结膜新月形切除术后4wk泪河恢复正常者,占73%(χ2=0.833,P=0.361),BUT≥10s者,占67%(χ2=0.159,P=0.690),氯霉素眼液尝味试验阳性者,占60%(χ2=0.136,P=0.713),差异均无统计学意义。结论:结膜松弛症定量定位切除术安全、简便、准确、有效,更适合手术经验不足的医师开展。

关键词：结膜松弛症定量定位切除术外科手术

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

Experimental and Theoretical Study on the Self-Weight Penetration Velocity of Suction Anchor Foundations in Sand

引用

China Ocean Engineering 2023年第5期37卷 863-875页

作者： SUN Kai MA Hui-huan WANG Fu-ming School of Civil Engineering Sun Yat-Sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Guangdong Key Laboratory of Oceanic Civil Engineering Guangzhou 510275China

The application of the wellhead suction anchor in the second production test of natural gas hydrates(NGHs)in the South China Sea(SCS)was met with *** design incorporates a central conductor guide pipe,which distinguishes it from traditional suction ***,this addition resulted in a relatively high penetration resistance and a shallower penetration depth at the self-weight penetration *** mitigate this issue,the current study proposes an optimized design where the end of the suction foundation is *** installation characteristics of the traditional suction foundation and new suction foundation during self-weight penetration into sand are studied through laboratory tests and theoretical *** flat and sharpened bottom shapes are considered in the traditional and new suction *** effects of the initial penetration velocity on the initial penetration depth and soil plug and impact cavity characteristics are systematically *** results show that the self-weight penetration depth of the foundation with a sharpened bottom is 44.5%deeper than that of the foundation with a flat *** are cavities around the foundation at the self-weight penetration stage,and the penetration depth is overestimated by 15%-30%.Finally,a model for predicting the penetration depth of the new suction foundation is proposed.

关键词： suction foundation self-weight penetration penetration velocity soil plug sharpened bottom

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 magnetic nanoparticle-based magnetic resonance imaging contrast agents

引用

Nano Research 2023年第11期16卷 12531-12542页

作者： huan Zhang Xiao Li Liu Hai ming Fan Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China Department of Radiology Zhuhai People’s Hospital(Zhuhai Hospital Affiliated with Jinan University)Zhuhai 519000China Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationProvincial Key Laboratory of Biotechnology of Shaanxi ProvinceNorthwest UniversityXi’an 710069China Institute of Regenerative and Reconstructive Medicine Med-X InstituteFirst Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710049China National Local Joint Engineering Research Center for Precision Surgery&Regenerative Medicine Shaanxi Provincial Center for Regenerative Medicine and Surgical EngineeringFirst Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710061China

Magnetic resonance imaging(MRI)has revolutionized medical imaging diagnostics with the advantages of non-invasive nature,absence of ionizing radiation,unrestricted penetration depth,high-resolution imaging of soft tissues,organs and blood vessels,and multi-parameter and multi-sequence *** agents(CAs)are crucial for enhancing image quality,detecting molecular-level changes,and providing comprehensive diagnostic information in contrast enhanced ***,the performance of clinical Gd-based CAs represents a limitation to the improvement of MRI sensitivity,specificity,and versatility,thereby impeding the achievement of satisfactory imaging *** recent years,the development of magnetic nanoparticle-based CAs has emerged as a promising avenue to enhance the capabilities of ***,we review the advances in magnetic nanoparticle-based MRI CAs,including blood pool CAs,biochemically-targeted CAs,stimulus-responsive CAs,and ultra-high field MRI CAs,as well as the use of CAs for cell labeling and ***,we offer insights into the future prospects and challenges associated with the integration of these nanoparticles into clinical practice.

关键词： magnetic resonance imaging magnetic nanoparticle blood pool contrast agents biochemically-targeted contrast agents stimulus-responsive contrast agents

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

Corrosion behavior of Al-3.0 wt%Mg alloy in NaCl solution under magnetic field

引用

Rare Metals 2017年第8期36卷 627-634页

作者： Xin Zhang Ze-Hua Wang Ze-Hua zhou Jian-ming Xu Zhao-Jun Zhong huan-Long Yuan College of Mechanics and Materials Hohai UniversityNanjing 210098China Zhangjiagang Hongji Aluminum Co.Ltd. Suzhou 215600China

The influences of applied magnetic field on the corrosion behavior of Al-3.0 wt%Mg alloy in 3.5 wt% NaCl solution were investigated by electrochemical measurements,scanning electron microscopy（SEM）and energy-dispersive spectroscopy（EDS）.Stochastic analysis was applied to investigate the influences of applied magnetic *** results indicate that the application of horizontal magnetic field of 0.4 T would increase the pitting corrosion potential（E_（pit））,decrease the corrosion current density（i_（corr））,prolong the pit initiation time,slow down the pit generation rate and inhibit the growth of pitting of the tested alloys in 3.5 wt% NaCl *** applied magnetic field would also change the mechanism of pit initiation of Al-3.0 wt%Mg alloy from A_3 model（without magnetic field）to A_3＋A_4 model（with magnetic field）.The intermediate product Al_（（ad））~＋ is the paramagnetic ion that would be influenced by magnetic field sensitively.

关键词： Al-3.0 wt%Mg alloy Applied magnetic field Pitting corrosion Paramagnetic ion

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

Scalable and adaptive log manager in distributed systems

引用

Frontiers of Computer Science 2023年第2期17卷 45-62页

作者： huan zhou Weining QIAN Xuan zhou Qiwen DONG Aoying zhou Wenrong TAN The Key Laboratory for Computer Systems of State Ethnic Affairs Commission Southwest Minzu UniversityChengdu 610041China School of Data Science and Engineering East China Normal UniversityShanghai 200062China

On-line transaction processing(OLTP)systems rely on transaction logging and quorum-based consensus protocol to guarantee durability,high availability and strong *** makes the log manager a key component of distributed database management systems(DDBMSs).The leader of DDBMSs commonly adopts a centralized logging method to writing log entries into a stable storage device and uses a constant log replication strategy to periodically synchronize its state to *** the advent of new hardware and high parallelism of transaction processing,the traditional centralized design of logging limits scalability,and the constant trigger condition of replication can not always maintain optimal performance under dynamic *** this paper,we propose a new log manager named Salmo with scalable logging and adaptive replication for distributed database *** scalable logging eliminates centralized contention by utilizing a highly concurrent data structure and speedy log hole *** kernel of adaptive replication is an adaptive log shipping method,which dynamically adjusts the number of log entries transmitted between leader and followers based on the real-time *** implemented and evaluated Salmo in the open-sourced transaction processing systems Cedar and *** results show that Salmo scales well by increasing the number of working threads,improves peak throughput by 1.56×and reduces latency by more than 4×over log replication of Raft,and maintains efficient and stable performance under dynamic workloads all the time.

关键词： distributed database systems transaction log-ging log replication scalable adaptive

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

多感官视角下城市居民滨江空间景观感知偏好

引用

中山大学学报（自然科学版）（中英文） 2025年第1期64卷 182-194页

作者：朱战强李欢中山大学地理科学与规划学院广东广州510006 广东省公共安全与灾害工程技术研究中心广东广州510006

中国城镇化迈入人口城镇化的“下半场”,多感官下的居民景观感知与规划设计是近年空间感知分析与规划设计的热点。然而,现有研究多集中于视觉、听觉单一感官分析或双重感官分析,存在着对嗅觉、触觉等感官缺乏关注,以及对多感官结合分析... 详细信息

中国城镇化迈入人口城镇化的“下半场”,多感官下的居民景观感知与规划设计是近年空间感知分析与规划设计的热点。然而,现有研究多集中于视觉、听觉单一感官分析或双重感官分析,存在着对嗅觉、触觉等感官缺乏关注,以及对多感官结合分析关注很少的理论不足。本文以多感官感知为视角,以广州市滨江公共空间景观作为研究对象,将其分为“自然、人类/人类活动、人造/机械”3种景观要素及33个景观因素,通过构建感知增长率指数,对视觉、听觉、嗅觉和触觉4种感官下的不同类型滨江空间的居民景观感知特征进行评价。结果表明:不同景观要素下4种感官的感知相对敏感度不同,自然景观中嗅觉敏感,人类活动景观中听觉敏感,人造景观中触觉敏感。相对视觉和触觉而言,听觉和嗅觉下居民景观感知需求更容易被忽视。居民对自然声音和自然气味的景观要素感知期待仍需加强,而人类活动声和机械气味则不受欢迎。多感官下的景观要素感知特征在不同类型的公共空间下存在差异,广场和桥下/码头是重点改造空间,需特别关注避免电子设备声和交通噪声的干扰。最后形成了各滨江空间相应的感知设计指引。本文提出,集成多感官的居民景观感知分析可为城市滨江空间规划和设计提供实质性的参考。

关键词：多感官感知滨江空间景观要素偏好广州市

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

Morphology control of magnetic properties in cobalt nanowires

引用

Rare Metals 2023年第6期42卷 1994-1999页

作者： huan-huan Xu Qiong Wu ming Yue Cheng-Lin Li Hong-Jian Li College of Materials Science and Engineering Beijing University of TechnologyBeijing100124China

Cobalt nanowires with different shapes and sizes were synthesized by reduction of carboxylate salts of Co^(Ⅱ) in 1,2-butanediol using a solvothermal chemical *** well-crystallized Co nanowires with hexagonal closepacked(hep) phase are observed and the(002) crystalline direction is along the long axis of nano *** morphology control is strongly dependent on the reaction *** varying the amount of capping agent in proper ranges,the effect of reaction parameters on controlling the size and shape of Co nanowires is *** the amount of capping agent increasing,the aspect ratio of Co nanowires increases ***,the magnetic measurement of cobalt nanowires shows that the coercivity of the Co nanocrystals does not increase with the increase in aspect ratio monotonously,which suggests that the tip shape and micros tructure also play an important role in the magnetization reversal process of the Co nanocrystals,and the aspect ratio plays a much less role as the ratio value exceeds *** further understand the effect of size on the magnetic properties in the Co nanowires,micromagnetic simulations were performed,which confirms that the magnetic properties are barely affected by the aspect ratio larger than *** highest coercivity of624 kA·m^(-1) is obtained for ellipsoid nano wires with a mean length of 200 nm,which also displays a strong magnetic *** a result,the highest energy product of the wires reaches 248 kJ·m^(-3).

关键词： Co nanowires Morphology control Tip shape High energy product

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

Space debris tracking based on fuzzy running Gaussian average adaptive particle filter track-before-detect algorithm

引用

Research in Astronomy and Astrophysics 2017年第2期17卷 51-62页

作者： Peerapong Torteeka Peng-Qi Gao ming Shen Xiao-Zhang Guo Da-Tao Yang huan-huan Yu Wei-Ping zhou You Zhao National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China University of Chinese Academy of Sciences Beijing 100049China

Although tracking with a passive optical telescope is a powerful technique for space debris observation, it is limited by its sensitivity to dynamic background noise. Traditionally, in the field of astronomy, static background subtraction based on a median image technique has been used to extract moving space objects prior to the tracking operation, as this is computationally efficient. The main disadvantage of this technique is that it is not robust to variable illumination conditions. In this article, we propose an approach for tracking small and dim space debris in the context of a dynamic background via one of the optical telescopes that is part of the space surveillance network project, named the Asia- Pacific ground-based Optical Space Observation System or APOSOS. The approach combines a fuzzy running Gaussian average for robust moving-object extraction with dim-target tracking using a particle- filter-based track-before-detect method. The performance of the proposed algorithm is experimentally evaluated, and the results show that the scheme achieves a satisfactory level of accuracy for space debris tracking.

关键词： astrometry -- space debris -- atmospheric effects -- image processing

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

Picoliter droplet array based on bioinspired microholes for in situ single-cell analysis

引用

Microsystems & Nanoengineering 2020年第1期6卷 951-959页

作者： Lin Du huan Liu Jia zhou State Key Laboratory of ASIC and System School of MicroelectronicsAcademy for Engineering&TechnologyFudan UniversityShanghai 200433China Tian Jin Tuo Rui Med Technology Co. LtdTianjin 200438China

The division of aqueous samples into microdroplet arrays has many applications in biochemical and medical *** by biological features,we propose a method to produce picoliter droplet arrays for single-cell analysis based on physical structure and interface.A 0.9 pL droplet array with an RSD(relative standard deviation)less than 6.3%and a density of 49,000 droplets/cm^(2) was successfully generated on a PDMS chip(polydimethylsiloxane)from a micromachined glass *** droplet generation principle of the wetting behavior in the microholes with splayed sidewalls on the PDMS chip by liquid smearing was *** feasibility of the picoliter droplets for bacterial single-cell analysis was verified by the separation of mixed bacteria into single droplets and isolated in situ bacteria propagation.

关键词： analysis analysis PDMS

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

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：