检索结果-南通市图书馆

Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2021年第6期8卷 1400-1410页

作者： Minghao Yi Liang wang Congmeng Hao Qingquan Liu zhenyang wang Key Laboratory of Coal Methane and Fire Control Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116JiangsuChina School of Safety Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

The purpose of underground methane drainage technology is to prevent methane disasters and enable the efficient use of coal mine methane(CMM),and the sealing depth is a key factor that affects the performance of underground methane *** this work,the layouts of in-seam and crossing boreholes are considered to analyze the stress distribution and failure characteristics of roadway surrounding rock through a numerical simulation and field stress investigation to determine a reasonable sealing *** results show that the depths of the plastic and elastic zones in two experimental coal mines are 16 and 20 m *** sealing minimizes the air leakage through the fractures around the roadway when the sealing material covers the failure and plastic zones,and the field test results for CMM drainage at different sealing depths indicate that the CMM drainage efficiency increases with increasing sealing depth but does not change once the sealing depth exceeds the plastic ***,sealing in the high-permeability roadway surrounding rock does not have a strong influence on the borehole sealing *** these findings,a new CMM drainage system for key sealing in the low-permeability zone was developed that is effective for improving the CMM drainage efficiency and prolonging the high-concentration CMM drainage *** proposed approach offers a valuable quantitative analysis method for selecting the optimum sealing parameters for underground methane drainage,thereby improving considerably the drainage and utilization rates of CMM.

关键词： Coal mine methane Methane drainage Borehole sealing Mining safety Methane utilization

Plasmonic Cu_(27)S_(24)nanocages for novel solar photothermal nanoink and nanofilm

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

Nano Research 2022年第4期15卷 3161-3169页

作者： Min Xi Longchang Xu Nian Li Shudong Zhang zhenyang wang Institute of Solid State Physics and Key Laboratory of Photovoltaic and Energy Conservation Materials Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China The Key Laboratory Functional Molecular Solids Ministry of Education Anhui Normal UniversityWuhu 241002China School of Mechatronics and Vehicle Engineering Chongqing Jiaotong UniversityChongqing 400074China

Copper sulfide(Cu_(x)S)as a plasmonic solar photothermal semiconductor material that expands the light collection range by altering localized surface plasmon resonance(LSPR)to the near-to mid-infrared(IR)spectral *** versatile synthesis strategies of Cu_(x)S nanostructure offer its variability of morphology and provide additional freedom in tuning the optical ***,nanocage(or nanoshell)has hybridized plasmon resonances as a result of super-positioned nanosphere and nanocavity,which extends its receiving range of solar spectrum and increases light-to-heat conversion ***,we offer novel“nanoink”and“nanofilm”developed from colloidal Cu_(27)S_(24)nanocages with excellent solar photothermal *** combining experimental measurement and theoretical calculation,we estimated the optical properties of covellite Cu_(27)S_(24).And based on obtained dielectric functions,we then calculated its solar photothermal performance,which was further validated by our experimental *** simulation results showed that hollow Cu_(27)S_(24)nanocages have excellent solar photothermal performance,and exhibit much higher solar photothermal conversion efficiency than solid Cu_(27)S_(24)nanospheres.

关键词： plasmonics solar photothermal hybridized plasmon Cu_(27)S_(24)nanocages

Rare-earth ions coordination enhanced ratiometric fluorescent sensing platform for quantitative visual analysis of antibiotic residues in real 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

Chinese Chemical Letters 2023年第6期34卷 278-281页

作者： Shihao Xu Lingfei Li Dan Lin Liang Yang zhenyang wang Changlong Jiang Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Key Laboratory of Photovoltaic and Energy Conservation Materials Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009China

Levofloxacin(LVFX)as a representative drug of quinolone antibiotics is widely used in clinical,and its residues enriched in water bodies and sideline products seriously damage human *** is imperative to develop a real-time/on-site sensing method for monitoring residual ***,we report a portable sensing platform by utilizing a composite fluorescent nanoprobe constructed by the cerium ions(Ce^(3+))coordination functionalized Cd Te quantum dots(QDs)for the visual and quantitative detection of LVFX *** fluorescent probe provides a distinct color variation from red to green,which shows a good linear relationship to LVFX residues concentrations in the range of 0-6.0μmol/L with a sensitive limit of detection(LOD)of 16.3 nmol/*** smartphone platform with Color Analyzer App installed,which could accomplish quantified detection of LVFX in water,milk,and raw pork with a LOD of 27.9nmol/*** facile sensing method we proposed realizes rapid visualization of antibiotics residual in the environment and provides a practical application pathway in food safety and human health.

关键词： Rare-earth ions Ratiometric fluorescence probe Smartphone sensing platform Quantitative detection Levofloxacin

Traffic Light Detection and Tracking Based on Euclidean Distance Transform and Local Contour Pattern

在线全文

学校读者我要写书评

暂无评论

Traffic Light Detection and Tracking Based on Euclidean Dist...

Latent Heat Enhancement of Stearic Acid nanoparticle Capsulated with Sillica

2013年中国智能自动化学术会议

作者： zhenyang wang Zhidong Deng Zhen Huang State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and TechnologyDepartment of Computer Science and TechnologyTsinghua University

This paper proposes a new recognition approach for traffic light based on Euclidean distance transform(EDT) and local contour pattern(LCP).There are two main contributions of this ***,this paper combines principle component analysis(PCA) with EDT-based image to detect traffic light *** color space for specific colors is partitioned more precisely,which leads to a high recognition ***,we incorporate the above color detection into the contour segmentation of traffic light holder based on the LCP to further improve the recognition rate of traffic *** experimental results show that our approach is able to detect traffic light far away from camera about 50-80 m and the average recognition rate can reach up to 99.29%.

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

Latent Heat Enhancement of Stearic Acid nanoparticle Capsula...

中国颗粒学会超微颗粒专委会2013年年会暨第八届海峡两岸超微颗粒学术研讨会

作者： Yingchang Jiang Qi Ji Shudong Zhang zhenyang wang Institute of Intelligent Machines Chinese Academy of Sciences School of Physics and Engineering Zhengzhou University

In this work,SA@SiO nanocapsules(NCs) were designed and fabricated to research its phase change *** by the selected sillica nanoshells,Latent heat of stearic acid(SA) could be increased up to 374.2 kJ/kg,about 36.9%more than that of pure *** can be attributed to the high superimposed stress from curvature effect inside SiO nanoshells,which would strengthen hydrogen bonds of SA encapsulated in the sillica

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

球形和方形湿颗粒团的碰撞模拟研究

应用力学学报 2020年第5期37卷 1929-1934,I0006,I0007页

作者：刘连峰王振阳王超西交利物浦大学理学院苏州215123 深圳健坤自动化工程有限公司深圳518107

本研究利用颗粒离散元方法,并结合接触力学理论,对微米级颗粒组成的湿颗粒聚合体碰撞破损的细观力学机理进行了模拟研究。模拟的颗粒聚合体分成球形和方形。将两种形状的颗粒聚合体碰撞结果做比较,颗粒之间的接触采用干、湿接触两种模... 详细信息

本研究利用颗粒离散元方法,并结合接触力学理论,对微米级颗粒组成的湿颗粒聚合体碰撞破损的细观力学机理进行了模拟研究。模拟的颗粒聚合体分成球形和方形。将两种形状的颗粒聚合体碰撞结果做比较,颗粒之间的接触采用干、湿接触两种模型并存的方式来模拟湿颗粒团碰撞中的不可恢复变形过程。在碰撞速度保持不变的情况,考察了不同液体黏度对颗粒聚合体碰撞的影响;在液体黏度保持不变的情况,考察了不同碰撞速度对碰撞结果的影响。研究结果表明,湿颗粒团表现出了与干颗粒团完全不同的损伤模式,没有产生类似于弹性颗粒团的裂解损伤。湿颗粒团在碰撞中,它的内部液桥数量会在与平板碰撞接触的初期快速减少,然后慢慢累计,或会超过湿颗粒团在碰撞前的液桥数量。这一现象在此仿真研究中首次被发现。比如,液体黏度为50mPa·s的方形湿颗粒团以2.0m/s撞击平板时,其内部液桥数可由约9400降低至约8700后,逐渐增加至11300左右;由低黏度液体组成的湿颗粒团在碰撞后会发生反弹现象。而随着液体黏度的增加,恢复系数会趋近于0。

关键词：离散元法湿颗粒团碰撞液桥恢复系数

激光诱导石墨烯的纳米银颗粒原位修饰及其导电性能调控

在线全文

学校读者我要写书评

暂无评论

复合材料学报 2024年第8期41卷 4124-4133页

作者：王文波宋彦平李年王振洋中国科学技术大学合肥230026 中国科学院合肥物质科学研究院固体物理研究所合肥230031

随着高频通信技术的快速发展,由电磁波造成的电磁干扰问题日益严重,亟需开发针对5G频段的电磁屏蔽材料。以两次激光诱导法直接在固体材料上快速制备了银纳米颗粒/多孔石墨烯柔性复合薄膜:首次激光制备的亲水性激光诱导石墨烯(LIG)能够... 详细信息

随着高频通信技术的快速发展,由电磁波造成的电磁干扰问题日益严重,亟需开发针对5G频段的电磁屏蔽材料。以两次激光诱导法直接在固体材料上快速制备了银纳米颗粒/多孔石墨烯柔性复合薄膜:首次激光制备的亲水性激光诱导石墨烯(LIG)能够高效吸附AgNO_(3)溶液,二次激光照射实现了银纳米粒子在多孔石墨烯上的原位生成和均匀负载。进一步研究了不同AgNO_(3)浓度对所制得Ag/LIG材料的微观形貌、结构性质和导电特性的影响。结果表明:当AgNO_(3)浓度为0.5 mol/L时,复合薄膜中银纳米颗粒保持小尺寸的同时分散性最好,其展现出2788 S/m的高电导率;同时,材料屏蔽效能从LIG的18~26 dB增加到复合材料的36~40 dB。在26 GHz频段处,Ag/LIG的屏蔽效能达到38 dB,经200次弯曲循环后效能保有率在90%以上。

关键词：激光诱导石墨烯银纳米颗粒分散性导电性电磁屏蔽

跨期总额控制、预算执行规则弱化与辖区公共支出绩效

在线全文

学校读者我要写书评

暂无评论

财政研究 2020年第3期36卷 40-54页

作者：孙克竞王祯阳东北财经大学财政税务学院中央财经大学财政税务学院

本文采用2008-2017年中国31个省级辖区的面板数据,在区分经常性与资本性地方公共支出的基础上,代表性地考察了社会治安、社会保障、环境保护、基础设施建设四类以结果导向为主的公共支出绩效指标体系,并以财政资金使用非遵从度与跨期财... 详细信息

本文采用2008-2017年中国31个省级辖区的面板数据,在区分经常性与资本性地方公共支出的基础上,代表性地考察了社会治安、社会保障、环境保护、基础设施建设四类以结果导向为主的公共支出绩效指标体系,并以财政资金使用非遵从度与跨期财政支出总额控制指数两个核心指标分别描述短期预算执行规则弱化与跨期财政支出总额控制,进而运用广义矩估计(GMM)方法展开实证研究。结果显示:(1)短期预算执行规则弱化对财政经常性支出与资本性支出的绩效影响截然相反。(2)跨期财政支出总额控制的严格约束对促进经常性与资本性支出绩效的提高起到相似的推动作用。(3)跨期财政支出总额控制与短期预算执行规则弱化对财政经常性与资本性支出绩效存在不同的交互效应。

关键词：总额控制预算执行公共支出绩效

在线全文

学校读者我要写书评

暂无评论

硅衬底化学机械抛光液的循环使用性能

电镀与涂饰 2022年第7期41卷 480-485页

作者：陶琴王振扬王同庆清华大学摩擦学国家重点实验室北京100084

采用8%(质量分数,下同)有机碱A和3%有机碱B作为抛光液的复配p H调节剂对硅衬底进行化学机械抛光。研究了2种有机碱单独使用或复配使用时对抛光速率和抛光表面质量的影响。结果表明,当2种有机碱复配时,硅衬底的平均抛光速率达到1.04μm/m... 详细信息

采用8%(质量分数,下同)有机碱A和3%有机碱B作为抛光液的复配p H调节剂对硅衬底进行化学机械抛光。研究了2种有机碱单独使用或复配使用时对抛光速率和抛光表面质量的影响。结果表明,当2种有机碱复配时,硅衬底的平均抛光速率达到1.04μm/min,同时可获得低表面粗糙度(Ra=0.621 nm)和无划痕的抛光表面。该抛光液在循环使用过程中表现出良好的稳定性,循环使用10次后抛光表面质量基本无变化,但抛光速率略降,主要与抛光液pH降低、黏度增大以及硅溶胶颗粒团聚有关。

关键词：化学机械抛光硅衬底 pH调节剂有机碱抛光速率表面粗糙度循环使用