检索结果-南通市图书馆

International Journal of Coal Science & Technology 2023年第2期10卷 129-145页

作者： Defeng Wang Dengwu Jiao Zhanbo Cheng qingwen shi Helmut Mischo Department for Underground Mining Methods Institute of Mining and Special Civil EngineeringTechnical University of Bergakademie FreibergFuchsmühlenweg 909599 Freiberg Dresden GermanyDepartment of Structural Engineering and Building MaterialsFaculty of Engineering and ArchitectureGhent University9052 ZwijnaardeBelgium School of Engineering University of WarwickCoventry CV47ALUK Department of Engineering West Virginia UniversityMorgantown 26505USA

Disposing of coal gangue and fly-ash on the surface is a risky method with tremendous potential catastrophic consequences for the *** mining is a promising practice for turning those hazardous wastes into functional backfill ***,how to efficiently deliver the slurry to the desired places remains *** address this issue,the computational fluid dynamics software Fluent was used in the current study in addition to a laboratory rheological test to simulate the impact of various parameters on the evolution of pressure at a particular section of the ***,the response surface method was employed to investigate how the various components and their corresponding influencing weights interact to affect the pressure *** study demonstrates that the pressure drop of the slurry is highly influenced by slurry concentration,speed,and pipe *** conveying speed is the main component in the bend section,pipe diameter takes over in the horizontal and vertical pipe sections.

关键词： Coal gangue slurry Pressure drop Numerical simulation Response surface analysis

Correlations between mineral composition and mechanical properties of granite using digital image processing and discrete element method

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

International Journal of Mining Science and Technology 2023年第8期33卷 949-962页

作者： Changdi He Brijes Mishra qingwen shi Yun Zhao Dajun Lin Xiao Wang Department of Mining Engineering University of UtahSalt Lake City 84112USA College of Mine Safety North China Institute of Science and TechnologyLangfang 065201China Department of Mining Engineering West Virginia UniversityMorgantown 26506USA Department of Electrical and Computer Engineering University of UtahSalt Lake City 84112USA College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China

This study investigated the correlations between mechanical properties and mineralogy of granite using the digital image processing(DIP) and discrete element method(DEM). The results showed that the X-ray diffraction(XRD)-based DIP method effectively analyzed the mineral composition contents and spatial distributions of granite. During the particle flow code(PFC2D) model calibration phase, the numerical simulation exhibited that the uniaxial compressive strength(UCS) value, elastic modulus(E), and failure pattern of the granite specimen in the UCS test were comparable to the experiment. By establishing 351 sets of numerical models and exploring the impacts of mineral composition on the mechanical properties of granite, it indicated that there was no negative correlation between quartz and feldspar for UCS, tensile strength(σ_(t)), and E. In contrast, mica had a significant negative correlation for UCS, σ_(t), and E. The presence of quartz increased the brittleness of granite, whereas the presence of mica and feldspar increased its ductility in UCS and direct tensile strength(DTS) tests. Varying contents of major mineral compositions in granite showed minor influence on the number of cracks in both UCS and DTS tests.

关键词： Granite Digital image processing Discrete element method Mineral composition Mechanical properties

Sessile droplet freezing and ice adhesion on aluminum with different surface wettability and surface temperature

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2015年第7期58卷 67-74页

作者： OU JunFei shi qingwen WANG ZhiLe WANG FaJun XUE MingShan LI Wen YAN GuiLong School of Materials Science and Engineering Nanchang Hangkong University Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province Nanchang Hangkong University Jiangsu Key Laboratory for Biomass-based Energy and Enzyme Technology Huaiyin Normal University

This paper focused on the sessile droplet freezing and ice adhesion on aluminum with different wettability （hydrophilic, com- mon hydrophobic, and superhydrophobic surfaces, coded as HIS, CHS, SHS, respectively） over a surface temperature range of -9℃ to -19℃. It was found that SHS could retard the sessile droplet freezing and lower the ice adhesion probably due to the interfacial air pockets （IAPs） on water/SHS interface. However, as surface temperature decreasing, some IAPs were squeezed out and such freezing retarding and adhesion lowering effect for SHS was reduced greatly. For a surface temperature of-19℃, ice adhesion on SHS was even greater than that on CHS. To discover the reason for the squeezing out of lAPs, forces applied to the suspended water on IAPs were analyzed and it was found that the stability of IAPs was associated with surface mi- cro-structures and surface temperature. These findings might be helpful to designing of SHS with good anti-icing properties.

关键词： superhydrophobic anti-icing ice adhesion interfacial air pockets

Upper-ocean variation in the northern South China Seafrom mooring station observations

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2000年第4期19卷 25-35页

作者： Fang Wendong, shi Ping, Mao qingwen, Gan Zijun (South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China) South China Sea Inst. of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

CTD temperature, salinity and ADCP current data, which were observed by R/V shiyan No. 3 during the intensive observational period (IOP) of the South China Sea monsoon experiment (SCSMEX), have been analyzed. Some study results from observations at a mooring station located at the vicinity of continental slope off the south of Dongsha Islands are shown. The dynamic and thermody namic structures as wall as their changes are analyzed to describe the upper-ocean variation in the northern South China Sea during the summer monsoon onset and maintaining periods. The response of near surface water temperature, salinity and current to local sea surface winds is also discussed.

关键词： Northern South China Sea upper-ocean variation summer monsoo$

特厚煤层中掘进巷道过联络巷期间巷道围岩活动规律研究

在线全文

学校读者我要写书评

暂无评论

中国煤炭 2016年第2期42卷 33-36页

作者：史庆稳煤炭科学研究总院开采设计研究分院北京市朝阳区100013

针对陕西某矿掘进巷道过联络巷期间发生的矿压异常现象,基于现场异常矿压观测情况,利用FLAC3D有限差分软件对特厚煤层中掘进巷道穿联络巷过程中不同时期巷道围岩应力分布演化特征进行了数值计算分析,并结合SOS微震监测结果对巷道围岩微... 详细信息

针对陕西某矿掘进巷道过联络巷期间发生的矿压异常现象,基于现场异常矿压观测情况,利用FLAC3D有限差分软件对特厚煤层中掘进巷道穿联络巷过程中不同时期巷道围岩应力分布演化特征进行了数值计算分析,并结合SOS微震监测结果对巷道围岩微震活动过程进行了研究。结果表明,在特厚煤层中掘进巷道穿联络巷过程中穿联络巷的巷道围岩冲击危险性呈现"升高—降低—升高—降低"的演化规律,并据此将巷道围岩应力分布演化过程近似划分为5个具有不同应力特点的阶段。

关键词：特厚煤层掘进巷道联络巷冲击危险性数值计算微震监测

在线全文

学校读者我要写书评

暂无评论

美丽红豆杉化学成分的研究

中草药 2000年第7期31卷 490-492页

作者：李作平史清文河北医科大学药学院石家庄050017 日本东北大学

从美丽红豆杉 Taxus mairei L emee et L evl ***树皮的甲醇提取物中分得 6个紫杉烷二萜类化合物 ,根据理化性质和光谱公析分别鉴定为 taxum airol B( )、7,2′-二去乙酰氧基 - austropicatine( )、taxine ( )、taxinine A ( )、taxinin... 详细信息

从美丽红豆杉 Taxus mairei L emee et L evl ***树皮的甲醇提取物中分得 6个紫杉烷二萜类化合物 ,根据理化性质和光谱公析分别鉴定为 taxum airol B( )、7,2′-二去乙酰氧基 - austropicatine( )、taxine ( )、taxinine A ( )、taxinine M ( )和 taxezopidine G ( )。除以外 ,其余 5个化合物均是首次从该植物中分得。

关键词：美丽红豆杉紫杉烷二萜类化合物化学成分

Chemical Constituents of Plants from the Genus Neolitsea

在线全文

学校读者我要写书评

暂无评论

Chemical Constituents of Plants from the Genus Neolitsea

社区动员中的基层干部:角色转换和行为调适——基于S市F社区加装电梯的个案考察

2013全国中药与天然药物高峰论坛暨第十三届全国中药和天然药物学术研讨会

作者： Xia Qing Ruixai Guo Xuan Zhao Tian-kun Ren qingwen shi School of Pharmaceutical Sciences Hebei Medical University

The genus Neolitsea(Lauraceae) comprises nearly 85 species which are distributed throughout the tropical and subtropical Asia and *** there are 45 species widespread in South China,East China and Southwest *** of them...

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

天津行政学院学报 2022年第6期24卷 22-31页

作者：姚尚建施清雯华东政法大学政府管理学院上海201620

在城市更新中,老旧小区的加装电梯既是一项公共政策的实施过程,也是社区动员的过程。S市F社区的加梯步骤、纠纷及处理办法说明,基层干部在社区加梯动员中形成了动态性的角色特征和行为逻辑。从角色特征看,基层干部始终聚焦于中心化决策... 详细信息

在城市更新中,老旧小区的加装电梯既是一项公共政策的实施过程,也是社区动员的过程。S市F社区的加梯步骤、纠纷及处理办法说明,基层干部在社区加梯动员中形成了动态性的角色特征和行为逻辑。从角色特征看,基层干部始终聚焦于中心化决策,以边缘化的姿态和情境式嵌套影响社区居民加梯的进度。从行为逻辑看,基层动员行为遵循“唤醒-联盟-行动”的基本结构,通过激发社区公共性实现社区利益整合,并最终以“小集团”达成集体行动。在这一过程中,基层干部的“在场”和“退场”很大程度上影响着基层治理的成效。同时作为基层治理的积极行动者,由于受到社区自治与指标管理的双重约束,基层干部的角色扮演和行为逻辑还存在一定的风险。

关键词：基层治理基层干部动员机制加装电梯

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

温度对MBR工艺处理垃圾渗滤液的影响初探

净水技术 2020年第8期39卷 131-136页

作者：施庆文上海市废弃物管理处上海200063

温度对MBR运行至关重要,通过比较分析老港四期生活垃圾填埋场渗滤液MBR运行温度以及出水水质变化,探讨温度对MBR工艺去除氮磷等污染物的影响。结果表明,MBR系统运行温度控制在30~35℃,可以提高硝化和反硝化反应速率,使MBR系统出水更稳... 详细信息

温度对MBR运行至关重要,通过比较分析老港四期生活垃圾填埋场渗滤液MBR运行温度以及出水水质变化,探讨温度对MBR工艺去除氮磷等污染物的影响。结果表明,MBR系统运行温度控制在30~35℃,可以提高硝化和反硝化反应速率,使MBR系统出水更稳定、确保达标。当MBR系统温度超过40℃时,生物系统中污泥发生水解,污泥中磷大量释放并富集。虽然当温度超过40℃时,理论上会有污泥有机氮的释放,但从实际运行数据上分析,出水NH3-N、硝酸盐和TN没有明显变化。

关键词：膜生物反应器温度渗滤液总氮总磷

在线全文

学校读者我要写书评

暂无评论

上海市湿垃圾处理运营补贴政策研究

环境与可持续发展 2021年第3期46卷 195-197页

作者：施庆文上海市资源利用和垃圾分类管理事物中心上海200085

目前上海市湿垃圾产生总量大。湿垃圾处理工艺包括中温减量型生物处理、高温减量型生物处理、粉碎脱水处理、堆肥型生化处理、高温快速好氧发酵、厌氧发酵、热解炭化7种。本文以资料分析、现场调研和实际测评作为不同工艺的研究资料来源... 详细信息

目前上海市湿垃圾产生总量大。湿垃圾处理工艺包括中温减量型生物处理、高温减量型生物处理、粉碎脱水处理、堆肥型生化处理、高温快速好氧发酵、厌氧发酵、热解炭化7种。本文以资料分析、现场调研和实际测评作为不同工艺的研究资料来源,在梳理了不同工艺的设施数量(点位)及处理能力和开展运营成本分析和测算基础上,根据上海市湿垃圾处理的补贴原则和企业的现场调研,提出了合理的补贴价格建议。

关键词：湿垃圾处理工艺运营补贴