检索结果-南通市图书馆

Journal of Wuhan University of Technology(Materials Science) 2023年第6期38卷 1335-1347页

作者： TIAN Changjin wang youzhi QIU Kai YANG Qilin School of Civil Engineering Shandong UniversityJinan 250002China China Construction Infrastructure Co. LtdBeijing 100089China School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China

To investigate the assumptions proposed in this paper,the evolution law governing the strength and expansion performance of MgO and nano-MgO micro-expansive concrete in the environment of mineral powder was firstly observed in this study.Secondly,SEM,XRD,and TG-DSC microscopic tests were conducted to reveal the effects of the active mineral-powder admixture on the hydration degree and expansion performance of MgO and nano-MgO in HPC.Our experimental results successfully verified our hypothesis,which indicated that the expansion performance of macro-MgO and nano-MgO was indeed depressed by the addition of active mineral power admixtures,even though the mechanical property of concrete composites was effectively improved.Furthermore,the hydration test also demonstrated the negative interference on the mineral powders,which was induced by the expansion agents.It is found the amounts of hydrates tend to decrease because the mineral powder ratio reaches and exceeds 40%.Moreover,it is also concluded the effect of expansion agents is governed by the alkalinity cement paste,especially for the nano-MgO.In other words,the expansion performance of nano-MgO will vary more obviously with the hydration process,than MgO.The results of this study provide that effective experimental and theoretical data support the hydration-inhibition mechanism of magnesium expansive agents.

关键词： MgO Nano-MgO mineral powders high-performance concrete expansive agents microstructures

在线全文

学校读者我要写书评

暂无评论

正交异性钢桥面板双轴疲劳性能评估

桥梁建设 2024年第2期54卷 91-98页

作者：安然王有志王希岗徐刚年齐鲁理工学院土木工程学院山东济南250200 山东大学土建与水利学院山东济南250061 中铁十四局集团第三工程有限公司山东济南250399 山东交通学院交通土建工程学院山东济南250357

为精确评估正交异性钢桥面板在双轴应力状态下的疲劳性能,以东营胜利黄河大桥为背景,建立该桥正交异性钢桥面板顶板、U肋、横隔板交叉连接部位焊缝的节段三维有限元模型,采用等效结构应力法对正交异性钢桥面板体系的双轴疲劳问题进行研... 详细信息

为精确评估正交异性钢桥面板在双轴应力状态下的疲劳性能,以东营胜利黄河大桥为背景,建立该桥正交异性钢桥面板顶板、U肋、横隔板交叉连接部位焊缝的节段三维有限元模型,采用等效结构应力法对正交异性钢桥面板体系的双轴疲劳问题进行研究;通过模型试验验证正交异性钢桥面板体系的双轴疲劳特性,并进行其构造细节疲劳寿命评估。结果表明:弧形切口起焊点的疲劳裂纹萌生位置在横隔板下方焊趾处,经历裂纹萌生、裂纹稳定扩展和裂纹失效3个阶段,最终失效阶段裂纹形式为Ⅱ型裂纹主导的Ⅰ-Ⅱ型复合裂纹,此为该桥正交异性钢桥面板结构体系的主导疲劳失效模式;顶板焊缝焊趾及弧形切口起焊点焊趾处于双轴应力状态,面内剪切结构应力幅对疲劳应力的影响显著,按单轴疲劳应力进行寿命预测误差较大,按单轴疲劳应力状态对结构进行疲劳寿命设计偏于不安全;基于组合等效结构应力法的计算值与试验值吻合较好,各焊接细节计算得到的最大值下的疲劳裂纹起裂位置均与试验结果一致,按双轴疲劳应力预测疲劳寿命与试验值吻合较好,疲劳寿命评价精确度较高。

关键词：正交异性钢桥面板等效结构应力法双轴应力疲劳性能有限元法疲劳试验

Characteristics of Coal Reservoir Pore Structure and Its Diffusion Mode in Huhehu Depression

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2015年第A1期89卷 457-459页

作者： wang youzhi Exploration and Development Research Institute of Daqing Oilfield Company Ltd.

1 Introduction The importance of reservoir has been widely recognized in the field of unconventional oil and gas r, esource（Zou Caineng et al., 2012）. The pore structure is the core problem of coal reservoir. One side, the pore structure influenced the adsorption ability of the coal pore structure; The other hand, the pore structure determines the coalbed methane output mode（Zou Caineng et al., 2013）. Hou QuanLin（2012） thinked that different deformation mechanisms, such as composition of the pore system and structure of coal are different, mainly in microstructure and pore structure and coal and chemical structure.

关键词： COAL RESERVOIRS SCANNING electron microscopy NITROGEN COALBED methane

在线全文

学校读者我要写书评

暂无评论

危险废物回转窑焚烧流程及配风改造

新疆钢铁 2024年第2期 52-54页

作者：王有治甘肃建投环保发展有限公司甘肃酒泉735099

危险废弃物问题近年来日益突出,并且还在不断上升,若无法进行有效处理,将会对自然环境造成污染,影响人类的身心健康,同时也会给社会带来一定程度的损失。因此,危险废物的处理已成为一个困扰社会的重要问题。危险废物焚烧是一种常见的危... 详细信息

危险废弃物问题近年来日益突出,并且还在不断上升,若无法进行有效处理,将会对自然环境造成污染,影响人类的身心健康,同时也会给社会带来一定程度的损失。因此,危险废物的处理已成为一个困扰社会的重要问题。危险废物焚烧是一种常见的危险废物处理方式,可以有效地减少危险废物体积和对环境的影响。然而,在焚烧过程中,焚烧效果的好坏对废气达标排放和设备损耗等会产生重要影响。本文主要介绍了回转窑焚烧流程,并提出了一种配风技术,并通过实践分析得出相应结论。

关键词：危险废物焚烧流程配风改造

Porosity Characteristics of Tectonic Coal and Its Controlling Factors

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2015年第A1期89卷 460-462页

作者： wang youzhi wang Shihui Exploration and Development Research Institute of Daqing Oilfield Company Ltd.

1 Introduction The coal, as a special reservoir, has a dual accumulating system of matrix pore and fracture. The pore is the main reservoir space of coalbed methane （CBM） in coal. Generally, pore structure is very complicated and irregularly so that it is hard to be described in the traditional geometry. The fractal theory plays an important role in describing the porous media of the seepage system in recent years. The studies by Pfeifer, Katz and Kroch show the pore distribution in such reservoirs as coal, sandstone, shale and carbonatite is according with the fractal theory.

关键词： COAL GAS reservoirs COALBED methane GAS fields NITROGEN

在线全文

学校读者我要写书评

暂无评论

ITMC市场营销沙盘模拟企业经营策略研究

贵州开放大学学报 2024年第1期32卷 37-42页

作者：王友志贵州职业技术学院贵阳550023

ITMC营销沙盘系统是全国职业院校技能大赛市场营销赛项的竞赛平台,企业如何制定合理的经营策略实现营销目标是各高职院校参赛队伍非常重视和关注的问题。文章拟从模拟企业经营产品、销售渠道、直销定价、零售消费者需求及媒体广告投放... 详细信息

ITMC营销沙盘系统是全国职业院校技能大赛市场营销赛项的竞赛平台,企业如何制定合理的经营策略实现营销目标是各高职院校参赛队伍非常重视和关注的问题。文章拟从模拟企业经营产品、销售渠道、直销定价、零售消费者需求及媒体广告投放五个方面,探索可操作的ITMC营销沙盘经营策略,为高职院校教师教学、教材编写、职业技能竞赛中学生制定经营方案提供决策支持和实践应用参考。

关键词：营销沙盘模拟企业经营策略

Main Controlling Factors of CMB Reservoir in Northeast China:Taking Jixi Basin as An Example

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2015年第A1期89卷 465-466页

作者： XU Chengwu wang Shihui TAN Baode wang youzhi LI Jia GUO Junwei Daqing oilfield exploration and Development Institute Daqing Heilongjiang 163712 Northeast Petroleum University Daqing City Heilongjiang Province 163318

1 Introduction The coal bearing basin in the east of Northeast China is many, and the little or middle fault depression of low or middle rank coal bearing basin is the main, including Jixi, Boli, Shuangyashan, Hegang, Hulin and other basins （TANG Shuheng, 2000）. Several coal bearing basins have seen well show of CBM（Tablel）. But the research of the coal bed gas system is not carried out at present.

关键词： COALBED methane MINE gases COAL basins COALFIELDS

四川盆地仪陇—平昌地区侏罗系凉高山组页岩油地质特征及富集条件

在线全文

学校读者我要写书评

暂无评论

岩性油气藏 2024年第2期36卷 52-64页

作者：白雪峰李军辉张大智王有智卢双舫隋立伟王继平董忠良中国石油大学(华东)地球科学与技术学院山东青岛266580 多资源协同陆相页岩油绿色开采全国重点实验室黑龙江大庆163712 中国石油大庆油田有限责任公司勘探开发研究院黑龙江大庆163712

基于钻井岩心的地球化学及其他实验分析结果,结合生产测试资料,对四川盆地仪陇—平昌地区侏罗系凉高山组页岩油地质特征及富集条件进行研究,并划分了勘探有利区。研究结果表明:(1)仪陇—平昌地区凉高山组为早侏罗世第3次湖盆扩张期的沉... 详细信息

基于钻井岩心的地球化学及其他实验分析结果,结合生产测试资料,对四川盆地仪陇—平昌地区侏罗系凉高山组页岩油地质特征及富集条件进行研究,并划分了勘探有利区。研究结果表明:(1)仪陇—平昌地区凉高山组为早侏罗世第3次湖盆扩张期的沉积产物,整体经历了凉下段滨湖—浅湖、凉上段中—下部深湖—半深湖及浅湖、凉上段上部三角洲前缘和浅湖的沉积环境变化。(2)研究区凉高山组页岩可分为长英质页岩、钙质页岩、黏土质页岩等3种;页岩有机质丰度高,TOC值为0.50%~3.39%,平均值为1.30%,有机质类型以Ⅱ_(1)和Ⅱ_(2)型为主,热演化程度高,镜质体反射率(Ro)为1.00%~1.90%,处于高—过成熟阶段。(3)凉高山组页岩物性较好,孔隙度为0.48%~7.17%,平均为3.61%,发育无机成因孔、有机孔和构造缝等储集空间类型;含油性较好,以轻质组分为主,整体呈零散状、点状分布,局部呈团块状富集;凉上段下部富有机质页岩更发育,是目前勘探的重点层位。(4)凉高山组页岩油气的富集受控于前陆盆地过渡期的弱沉降环境、大面积分布的深湖相沉积、较高的热演化程度以及普遍发育的微裂缝。中南部为页岩油气潜力区,页岩储层厚度一般大于15 m,TOC值大于1.50%,孔隙度大于4.00%,R_(o)大于1.30%;凉高山组页岩油资源量为26.75×10^(8)t、页岩气资源量为1.72×10^(12)m^(3),有望成为四川盆地石油产量增加的主力层系。

关键词：页岩油轻质油湖盆扩张期前陆盆地弱沉降环境深湖相高—过成熟阶段微裂缝凉高山组侏罗系仪陇—平昌地区四川盆地

Functional Optical Fiber Sensors Detecting Imperceptible Physical/Chemical Changes for Smart Batteries

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第8期16卷 268-308页

作者： Yiding Li Li wang youzhi Song Wenwei wang Cheng Lin Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084People’s Republic of China National Engineering Research Center of Electric Vehicles Beijing Institute of Technology(BIT)Beijing 100081People’s Republic of China Shenzhen Automotive Research Institute of BIT(Shenzhen Research Institute of National Engineering Research Center of Electric Vehicles) Shenzhen 518118People’s Republic of China

The battery technology progress has been a contradictory process in which performance improvement and hidden risks coexist.Now the battery is still a“black box”,thus requiring a deep understanding of its internal state.The battery should“sense its internal physical/chemical conditions”,which puts strict requirements on embedded sensing parts.This paper summarizes the application of advanced optical fiber sensors in lithium-ion batteries and energy storage technologies that may be mass deployed,focuses on the insights of advanced optical fiber sensors into the processes of one-dimensional nano-micro-level battery material structural phase transition,electrolyte degradation,electrode-electrolyte interface dynamics to three-dimensional macro-safety evolution.The paper contributes to understanding how to use optical fiber sensors to achieve“real”and“embedded”monitoring.Through the inherent advantages of the advanced optical fiber sensor,it helps clarify the battery internal state and reaction mechanism,aiding in the establishment of more detailed models.These advancements can promote the development of smart batteries,with significant importance lying in essentially promoting the improvement of system consistency.Furthermore,with the help of smart batteries in the future,the importance of consistency can be weakened or even eliminated.The application of advanced optical fiber sensors helps comprehensively improve the battery quality,reliability,and life.

关键词： Smart battery Advanced embedded optical fiber sensor Battery internal physical/chemical state Quality-reliability-life characteristic

Investigation of hydroxyl-terminated polybutadiene propellant breaking characteristics and mechanism impacted by submerged cavitation water jet

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 559-572页

作者： Wenjun Zhou Meng Zhao Bo Liu youzhi Ma youzhi Zhang Xuanjun wang Zhijian Laboratory Rocket Force University of EngineeringXi’an710025China

A submerged cavitation water jet(SCWJ)is an effective method to recycle solid propellant from obsolete solid engines by the breaking method.Solid propellant's breaking modes and mechanical process under SCWJ impact are unclear.This study aims to understand those impact breaking mechanisms.The hydroxyl-terminated polybutadiene(HTPB)propellant was chosen as the research material,and a self-designed test system was used to conduct impact tests at four different working pressures.The high-speed camera characterized crack propagation,and the DIC method calculated strain change during the impact process.Besides,micro and macro fracture morphologies were characterized by scanning electron microscope(SEM)and computed tomography(CT)scanning.The results reveal that the compressive strain concentration region locates right below the nozzle,and the shear strain region distributes symmetrically with the jet axis,which increases to 4% at first 16th ms,the compressive strain rises to 2% and 6% in the axial and transverse direction,respectively.The two tensile cracks formed first at the compression strain concentrate region,and there generate many shear cracks around the tensile cracks,and those shear cracks that develop and aggregate cause the cracks to become wider and cut through the tensile cracks,forming the tensile-shear cracks and the impact parts eventually fail.The HTPB propellant forms a breaking hole shaped conical after impact 10 s.The mass loss increases by 17 times at maximum,with the working pressure increasing by three times.Meanwhile,the damage value of the breaking hole remaining on the surface increases by 7.8 times while 2.9 times in the depth of the breaking hole.The breaking efficiency is closely affected by working pressures.The failure modes of HTPB impacted by SCWJ are classified as tensile crack-dominated and tensile-shear crack-dominated damage mechanisms.

关键词： Submerged cavitation water jet Hydroxyl-terminated polybutadiene propellant Breaking characteristics Failure modes