检索结果-南通市图书馆

A novel responsive stabilizing Janus nanosilica as a nanoplugging agent in water-based drilling fluids for exploiting hostile shale environments

引用

Petroleum Science 2024年第2期21卷 1190-1210页

作者： Alain Pierre Tchameni lv-yan zhuo Lesly Dasilva Wandji Djouonkep Robert Dery Nagre Lu-Xin Chen Lin Zhao Chao Ma Bin-Qiang Xie College of Petroleum Engineering Yangtze UniversityWuhan430100HubeiChina Key Laboratory of Drilling and Production Engineering for Oil and Gas HubeiChina Lost Circulation Control Laboratory National Engineering Laboratory for Petroleum Drilling EngineeringYangtze UniversityWuhan430100HubeiChina College of Petroleum Engineering Shandong Institute of Petroleum and Chemical TechnologyDongying257061ShandongChina Petroleum Engineer Research Institute of Petrochina Dagang Oilfield Tianjin300280China Department of Chemical Engineering Kumasi Technical UniversityP.O.Box 854KumasiGhana

Thermo-responsive nanocomposites have recently emerged as potential nanoplugging agents for shale stabilization in high-temperature water-based drilling fluids(WBDFs). However, their inhibitory properties have not been very effective in high-temperature drilling operations. Thermo-responsive Janus nanocomposites are expected to strongly interact with clay particles from the inward hemisphere of nanomaterials, which drive the establishment of a tighter hydrophobic membrane over the shale surface at the outward hemisphere under geothermal conditions for shale stabilization. This work combines the synergistic benefits of thermo-responsive and zwitterionic nanomaterials to synchronously enhance the chemical inhibitions and plugging performances in shale under harsh conditions. A novel thermoresponsive Janus nanosilica(TRJS) exhibiting zwitterionic character was synthesized, characterized,and assessed as shale stabilizer for WBDFs at high temperatures. Compared to pristine nanosilica(Si NP)and symmetrical thermo-responsive nanosilica(TRS), TRJS exhibited anti-polyelectrolyte behaviour, in which electrolyte ions screened the electrostatic attraction between the charged particles, potentially stabilizing nanomaterial in hostile shaly environments(i.e., up to saturated brine or API brine). Macroscopically, TRJS exhibited higher chemical inhibition than Si NP and TRS in brine, prompting a better capability to control pressure penetration. TRJS adsorbed onto the clay surface via chemisorption and hydrogen bonding, and the interactions became substantial in brine, according to the results of electrophoretic mobility, surface wettability, and X-ray diffraction. Thus, contributing to the firm trapping of TRJS into the nanopore structure of the shale, triggering the formation of a tight hydrophobic membrane over the shale surface from the outward hemisphere. The addition of TRJS into WBDF had no deleterious effect on fluid properties after hot-treatment at 190℃, implying that TRJ

关键词： Janus nanosilica Thermo-responsive copolymer Anti-polyelectrolyte effect Shale stabilizer Inhibition Plugging Drilling fluid

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

区域旅游资源极化及因应对策——以湖北省恩施州为例

引用

中南民族大学学报（人文社会科学版） 2024年第4期44卷 79-87,219,220页

作者：高华峰吕彦卓湖北民族大学经济与管理学院湖北恩施445000

旅游资源禀赋决定了区域旅游发展路径选择和发展水平。以恩施州省级度假区和4A级及以上景区为样本,运用核密度、最邻近指数方法,分析恩施州各县市旅游景区空间结构演化特征、旅游相关因子发展水平,结合旅游相关因子分析,确定高等级旅游... 详细信息

旅游资源禀赋决定了区域旅游发展路径选择和发展水平。以恩施州省级度假区和4A级及以上景区为样本,运用核密度、最邻近指数方法,分析恩施州各县市旅游景区空间结构演化特征、旅游相关因子发展水平,结合旅游相关因子分析,确定高等级旅游景区协调因子指标,采用耦合协调度方法分析各县市旅游相关因子的协调程度,评价恩施州旅游发展条件。恩施州应以系统观为指导,发挥优势因子带动作用,综合提升区域耦合协调度水平,创建区域旅游协同品牌,减轻旅游景区的空间极化,以推进旅游协同发展,以旅游发展带动乡村全面振兴。

关键词：旅游景区空间结构极化分布耦合协调度

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Electrochemical formation and phase control of Mg-Li alloys

引用

Chinese Chemical Letters 2007年第9期18卷 1124-1128页

作者： Zhang, Mi Lin Chen, Zeng Han, Wei lv, yan zhuo Wang, Jun Harbin Engn Univ Key Lab Superlight Mat & Surface Technol Minist Educ Harbin 150001 Peoples R China

The electrochemical formation of Mg-Li alloys was investigated in a molten LiCl-KCl (58-42 mol%) eutectic melt at 723 K. The cyclic voltammogram. for a Mo electrode showed that the electroreduction of Li+ proceeds in a single step and the deposition potential of Li metal was -2.40 V (vs. Ag/AgCl). For Mg electrode, the electroreduction of Li+ takes place at less cathodic potential than that at the Mo electrode which was caused by the formation of Mg-Li alloys. Phase of the deposited Mg-Li alloys could be controlled by the electrolysis potential, and the samples were characterized by X-ray diffraction and scanning electron microscopy. The results showed that alpha-Mg and beta-Li phases were obtained at -2.35 and -2.55 V, respectively. (c) 2007 Mi Lin Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： LiCl-KCl molten salt electrodeposition Mg-Li alloy

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

中型泡沫混凝土自保温砌块墙体热工性能数值分析研究

引用

砖瓦 2024年第5期 18-23页

作者：时磊陈晗窦俊艳吕卓燕牟世宁陈一全滕州安居城市建设投资有限公司山东枣庄277599 兰陵县建设安全工程质量服务中心山东临沂277700 栖霞市市政养护中心山东烟台265300 滕州市中等职业教育中心学校山东枣庄277599 烟台三力轻质混凝土科技有限公司山东烟台264100 山东省住房和城乡建设发展研究院山东济南250001

通过ABAQUS对热工试验进行有限元模拟,分析了砌块内叶板厚度、保温芯材种类及保温芯材厚度等参数下的热工性能。结果表明:ABAQUS有限元软件具有较高的准确性,通过编写Python脚本及软件后处理得到结构的热阻值比传统理论方法更高效准确,... 详细信息

通过ABAQUS对热工试验进行有限元模拟,分析了砌块内叶板厚度、保温芯材种类及保温芯材厚度等参数下的热工性能。结果表明:ABAQUS有限元软件具有较高的准确性,通过编写Python脚本及软件后处理得到结构的热阻值比传统理论方法更高效准确,墙体总厚度为200mm时,所有规格墙体热阻值均小于3.3(m^(2)·K)/W;墙体总厚度为240mm时,以EPS为保温芯材热阻值均小于3.3(m^(2)·K)/W,以XPS、SEPS和SXPS为保温芯材时均大于3.3(m^(2)·K)/W;墙体总厚度为260mm和300mm时,所有保温芯材的墙体热阻值均大于3.3(m^(2)·K)/W。

关键词：自保温砌块 ABAQUS 热工性能数值分析

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

Morphology and magnetic properties of NiCuZn ferrite synthesized by solid-molten salt method

Morphology and magnetic properties of NiCuZn ferrite synthes...

引用

第八届中国功能材料及其应用学术会议

作者： FENG Jing LIU Tian-di CHEN yan WANG Yu-ting REN Yue-ming lv yan-zhuo FAN Zhuang-jun Key Laboratory of Superlight Materials & Surface Technology of Ministry of Education Harbin Engineering University

ISBN: (纸本)9783037859698

Cu doped NiCuZn ferrite NiCuZnFeO(x =0.16-0.28) have been prepared by the solid-molten salt method using NaCl as *** structure and properties were investigated by X-ray diffraction(XRD),scanning electron microscope(SEM) and vibrating sample magnetometer(VSM) *** is found that addition of Cu results in the particles size growing up because of the tend of crystal structure to be a normal Zn *** Ms values of NCZFare decrease gradually with increasing of Cu *** temperature(T) increases with Cu content in the range of x <0.20,and then decreasing *** can be ascribed to that the lower magnetization moment Cu ion amount of B-site increasing leads to weaker super-exchange effect.

关键词： Magnetic NiCuZn ferrite Solid-molten salt method

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

Control of chiral-optical activities by magnetic field based on the transformation of achiral binary crystals into chiral ternary crystals

引用

Science China Chemistry 2024年第7期67卷 2300-2305页

作者： Zhiyan Chen yan lv Wei Qin College of Physics Qingdao UniversityQingdao 266071China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Shandong Linuo Photovoltaic Hi-Tech Co. Ltd.Jinan 250100China

Multicomponent self-assembled chiral systems have attracted great attention due to their promising application in the area of spin-photonics and *** this work,through introducing an achiral third component into an achiral binary crystal,a chiral organic ternary crystal is fabricated,where both pronounced chiral-optical coupling and magnetic field dependence of chiral-optical activities are *** transformation of achiral structure into chiral structure generates a significant effect on the polarized state of light and the electron spin resonance ***,the coupling between circularly polarized photon and spin is observed in chiral ternary crystal with pronounced chiral orbit,where obvious magnetic field-transmissivity loop is ***,temperature could increase the magnitude of lattice parameters to lead to a larger helix radius to increase the chiral orbit ***,this work indicates that the further exploration of photon-chiral orbit-spin interactions in organic chiral ternary crystals is promising.

关键词： organic chiral ternary crystals chiral orbit chiral-optical activities magnetic field

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

Theoretical screening of cooperative N-bridged dual-atom sites for efficient electrocatalytic nitrogen reduction with remolding insight

引用

Nano Research 2024年第4期17卷 3413-3422页

作者： Huimei Chen yan yang Chi Jiao Zhiwen zhuo Junjie Mao yan Liu Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

The electrocatalytic nitrogen reduction reaction(e-NRR)is a promising alternative method for the Haber–Bosch ***,it still faces many challenges in searching for high activity,stability,and selectivity catalysts and ascertaining the catalytic mechanism with complete ***,a series of graphene-based N-bridged dual-atom catalysts(M1-N-M2/NC)are systematically investigated via first-principle calculation and a high-throughput screening *** result unveils that N_(2) adsorption on M1-N-M2/NC in bridge-on adsorption mode can effectively break the scaling relationship on single-atom catalysts(SACs).Moreover,V-N-Ru/NC and V-N-Os/NC are systematically screened out as promising e-NRR catalysts,with extremely low limiting potentials of-0.20 and-0.18 V,***,the adsorption site competition between*N_(2) and*H,as well as the competitive twin reactions of hydrogen evolution reaction(HER)on intermediates(N_(n)H_(m))during the e-NRR process,is systematically evaluated to form a remodeling insight for the reactions in mechanism,and the e-NRR of new proposed dual-atom catalysts(DACs)is strategically optimized for its high-efficiency performance potential via our remolding insight in e-NRR *** work provides new ideas and insights for the design and mechanism of e-NRR catalysts and an effective strategy for rapidly screening highly efficient e-NRR catalysts.

关键词： nitrogen reduction dual-atom catalysts high-throughput screening hydrogen evolution reaction density functional theory calculations

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

Reinforcement learning based edge computing in B5G

引用

Digital Communications and Networks 2024年第1期10卷 1-6页

作者： Jiachen yang Yiwen Sun Yutian Lei zhuo Zhang yang Li Yongjun Bao Zhihan lv School of Electrical and Information Engineering Tianjin UniversityTianjin300072China Technology and Data Center ***Beijing100176China School of Data Science and Software Engineering Qingdao UniversityQingdao266101China

The development of communication technology will promote the application of Internet of Things,and Beyond 5G will become a new technology *** the same time,Beyond 5G will become one of the important supports for the development of edge computing *** paper proposes a communication task allocation algorithm based on deep reinforcement learning for vehicle-to-pedestrian communication scenarios in edge *** trial and error learning of agent,the optimal spectrum and power can be determined for transmission without global information,so as to balance the communication between vehicle-to-pedestrian and *** results show that the agent can effectively improve vehicle-to-infrastructure communication rate as well as meeting the delay constraints on the vehicle-to-pedestrian link.

关键词： Reinforcement learning Edge computing Beyond 5G Vehicle-to-pedestrian

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

Exceptional reversed yield strength asymmetry in a rare-earth free Mg alloy containing quasicrystal precipitates

引用

Journal of Magnesium and Alloys 2024年第2期12卷 687-699页

作者： Qiang yang Shuhui lv Zixiang yan Zefeng Xie Xin Qiu State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China School of Materials Science and Engineering Changchun University of Science and Technology130022PR China

This work reports an exceptional reversed yield strength asymmetry at room temperature for a rare-earth free magnesium alloy containing a mass of fine dispersed quasicrystal(I-phase)*** exhibiting traditional basal texture,it owns an exceptional CYS/TYS as high as~*** back-scattered diffraction(EBSD)and transmission electron microscopy(TEM)examinations indicate pyramidal and prismatic dislocations plus tensile twinning being activated after immediate yielding in compression while basal and non-basal dislocations in tension.I-phase particles transferred the concentrated stress by self-twinning to provide the driving force for tensile twin initiating in neighboring grains,thereby significantly increasing the critical resolved shear stress of tensile twinning to possibly the level of pyramidal slip,finally leading to the dominance of pyramidal slip plus tensile twinning in texture *** results in a higher contribution on yield strength by~55 MPa in compression than in tension,which reasonably agrees with the experimental yield strength difference(~38 MPa).It can be concluded that I-phase particles influence deformation modes in tension and in compression,finally result in reversed yield strength asymmetry.

关键词： Magnesium alloy Reversed yield strength asymmetry Transmission electron microscopy(TEM) Twinning Dislocations

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

Thermal fatigue and wear of compacted graphite iron brake discs with various thermomechanical properties

引用

China Foundry 2024年第3期21卷 248-256页

作者： Gui-quan Wang zhuo Xu Zhong-li Liu Xiang Chen yan-xiang Li School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005ShandongChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China

The increase in payload capacity of trucks has heightened the demand for cost-effective yet high performance brake *** this work,the thermal fatigue and wear of compacted graphite iron brake discs were investigated,aiming to provide an experimental foundation for achieving a balance between their thermal and mechanical *** graphite iron brake discs with different tensile strengths,macrohardnesses,specific heat capacities and thermal diffusion coefficients were produced by changing the proportion and strength of *** peak temperature,pressure load and friction coefficient of compacted graphite iron brake discs were analyzed through inertia friction *** morphology of thermal cracks and 3D profiles of the worn surfaces were also *** is found that the thermal fatigue of compacted graphite iron discs is determined by their thermal properties.A compacted graphite iron with the highest specific heat capacity and thermal diffusion coefficient exhibits optimal thermal fatigue *** of the matrix at low temperatures significantly weakens the function of alloy strengthening in hindering the propagation of thermal *** the reduced hardness,increasing the ferrite proportion can mitigate wear loss resulting from low disc temperatures and the absence of abrasive wear.

关键词： compacted graphite iron brake disc thermomechanical properties thermal fatigue wear

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：