检索结果-南通市图书馆

Preparation of single-phase ammonium dimolybdate by combination process

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第5期31卷 517-522页

作者： zhang bao XIA Xiaomei LI Qian School of Metallurgical Science and Engineering Central South University Changsha 410083 China

A novel method for the preparation of single-phase ammonium dimolybdate with industrial ammonium molybdate was studied. Various in- fluential factors were evaluated in the paper, including reaction temperature, reaction time, initial molybdenum concentration, initial NH_3 /Mo molar ratio, and stirring speed. Under the optimum experimental conditions, the crystallization rate of product is 85.23%. The X-ray diffraction (XRD) analysis and chemical analysis show that the product is single-phase ammonium dimolybdate, and no impurity phases exist. The scanning electronic microscope (SEM) image reveals uniform particle size, good particle dispersion, and no agglomeration between particles. Meanwhile, the final pH value of acidification was investigated. The total molybdenum recovery can reach up to 99.40%, and the main phases of acidification product are the same as those of raw material with the final pH value of 1.5. This determines that the acidification product can be used as a raw material to produce single-phase ammonium dimolybdate.

关键词： single-phase ammonium dimolybdate combination process crystallization rate phase composition total molybdenum recovery

Calculation Methods of Added Resistance and Ship Motion Response Based on Potential Flow and Viscous Flow Theory

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2022年第3期36卷 488-499页

作者： WU Qi-ming zhang bao-ji Shanghai Maritime University College of Ocean Science and EngineeringShanghai 201306China

To improve the energy efficiency of ships and to predict ship motion response under actual sea conditions,the far-field theory,strip theory,and Fujii and Takahashi’s modified semi-empirical method are based and studied to calculate the wave-induced added ***,a new modified formula based on the Maruo method is presented to calculate the radiation added resistance for the ship with a complex ***,some calculation details such as the Green function,the shape of the sections(shape below the still water level or shape below the wave level)in the strip theory,and so on are ***,the CFD method is used to simulate the motions of the hull and the added resistance,and the results of the CFD method and those of other numerical methods are analyzed and compared with the experiment *** modified method in the paper can predict the added resistance in waves for the complex-hull-surface ships well and quickly.

关键词： wave-induced added resistance strip theory computation fluid dynamics motion response

Recent advances in improving performances of the lightweight complex hydrides Li-Mg-N-H system

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2017年第1期27卷 21-33页

作者： bao zhang Ying Wu China Iron & Steel Research Institute Group Advanced Technology & Materials Co. Ltd

A brief review of state-of-the art advances in improving performances of the lightweight complex hydrides LiMg-N-H system is reported. Among the hydrogen storage materials, Li-Mg-N-H combination systems are regarded as one of the most potential candidates for the vehicular applications owing to their high hydrogen storage capacity( > 5 wt% H) and a more appropriate thermodynamic properties of hydrogen absorption and desorption. In the Li-Mg-N-H systems, tremendous efforts have been devoted to improving the hydrogen storage properties by adjusting composition, revealing reaction mechanisms, adding catalysts and refining the microstructures, etc. During the studies, different mechanisms, such as the coordinated two-molecule or multimolecule reaction mechanism and the ammonia-mediated mechanism, are proposed and applied under some certain conditions. Catalysis and nanosizing are very effective in enhancing the kinetic properties and thermodynamic destabilization of Li-Mg-N-H systems. Due to nano effects, the space-confinement and nanoconfinement seems to be more effective for improving the hydrogen storage performance, and it is great significant to develop hydrogen storage materials by studying the nanoconfined effects on the Li-Mg-N-H systems.

关键词： Li-Mg-N-H system Hydrogen storage Catalysis Nanosizing Mechanism

讲好中国古代文学故事的进路与思考——从神曲《罗刹海市》谈起

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

吕梁学院学报 2024年第3期14卷 28-33页

作者：张宝张书畅谢馨莹复旦大学国际文化交流学院上海200433 复旦大学中文系上海200433

流行歌手刀郎所改编的《罗刹海市》取材于《聊斋志异》,现已成为来华留学生乃至全球中文学习者有可能接触到的一个中国文化元素。通过引入流行歌曲讲好中国古代文学故事《罗刹海市》可成为国际中文教育视域下跨文化交际的具体案例。因而... 详细信息

流行歌手刀郎所改编的《罗刹海市》取材于《聊斋志异》,现已成为来华留学生乃至全球中文学习者有可能接触到的一个中国文化元素。通过引入流行歌曲讲好中国古代文学故事《罗刹海市》可成为国际中文教育视域下跨文化交际的具体案例。因而,从故事讲述方式、文化元素利用、思想内涵传递三个方面对相关问题予以探讨,以提升传播中国古代文学故事的广度与深度。

关键词：《罗刹海市》中国故事跨文化交际中文教学实践

ARCS动机模型下右玉精神融入高校思政教育探析

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

山西大同大学学报（社会科学版） 2024年第1期38卷 60-63页

作者：张蓉瑞张宝文山西农业大学农业工程学院山西太谷030801

右玉精神蕴涵的深厚思想精髓是我国高校思想政治教育的重要资源和优秀教材,能够很好地帮助当代青年学生提升自身政治素养和传承艰苦奋斗的精神。文章基于ARCS动机模型,从“注意、关联、信心、满意”四个环节,归纳总结了右玉精神融入高... 详细信息

右玉精神蕴涵的深厚思想精髓是我国高校思想政治教育的重要资源和优秀教材,能够很好地帮助当代青年学生提升自身政治素养和传承艰苦奋斗的精神。文章基于ARCS动机模型,从“注意、关联、信心、满意”四个环节,归纳总结了右玉精神融入高校思想政治教育过程中面临的现实困境,如学习氛围不浓且教学模式陈旧、学习内容机械生硬、教学手段陈旧单调、学习效果不佳学生满意度不高,尝试提出营造氛围改变教学模式、与时俱进设计教学内容、完善教学评价反馈机制、情景教学并注重成果展示四个解决路径。

关键词： ARCS动机模型右玉精神高校思想政治教育

塔里木盆地库车山前超深气井砂垢堵塞成因及靶向解除技术

在线全文

学校读者我要写书评

暂无评论

天然气工业 2024年第8期44卷 85-94页

作者：曹立虎江同文潘昭才孙涛张宝吴红军易俊中国石油塔里木油田公司中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心新疆超深油气重点实验室中国石油天然气股份有限公司

塔里盆地库车山前超深气田是西气东输主力气源地,具有超高温、超高压、高矿化度、储层裂缝非均质性强等特征,气井生产过程中砂垢堵塞问题突出,据统计最高影响气田产能达800×104 m^(3)/d。为实现超深气井高效解堵,通过气水两相结垢热力... 详细信息

塔里盆地库车山前超深气田是西气东输主力气源地,具有超高温、超高压、高矿化度、储层裂缝非均质性强等特征,气井生产过程中砂垢堵塞问题突出,据统计最高影响气田产能达800×104 m^(3)/d。为实现超深气井高效解堵,通过气水两相结垢热力学预测模型、裂缝性储层岩石力学实验、井筒内气液固流动模拟等研究,揭示了超深气井砂垢复合堵塞成因,并形成了靶向解堵复产关键技术。研究结果表明:①“高温流动压降结垢、裂缝面破裂出砂”是超深气井出砂结垢的内在机理;②结垢固化松散砂桥形成复合堵塞是气井堵塞减产的主要原因,其中靶向除垢是解堵复产的关键所在;③靶向除垢解堵区域为井筒变径处和井周5 m内基质—裂缝系统,气井堵塞率30%~60%为最佳解堵时机;④非酸性除垢解堵液相比常用的酸性解堵液,在同级别溶垢能力的基础上,腐蚀速率降至0.49 g/(m^(2)·h),可同时满足低腐蚀和高效除垢的技术要求。结论认为,形成的超深气井靶向除垢解堵技术在塔里木盆地库车山前超深气田规模应用159井次,有效率达93.3%,累计增产天然气75.08×10^(8)m^(3),已成为西气东输主力气井快速解堵复产的“冬保良方”,可为国内外同类气田解堵复产提供技术借鉴。

关键词：塔里木盆地库车山前超深层高温流动压降结垢裂缝性储层出砂砂垢复合堵塞非酸性靶向除垢解堵

PARTICLE SWARM OPTIMIZATION BASED ON PYRAMID MODEL FOR SATELLITE MODULE LAYOUT

同方期刊数据库

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

Chinese Journal of Mechanical Engineering 2005年第4期18卷 530-536页

作者： zhang bao Teng Hongfei Key Laboratory for Precision and Nontraditional Machining Technology of Ministry of Education of China Dalian University of Technology Dalian 116024 China School of Mechanical Engineering Dalian University of Technology Dalian 116024 China

To improve the global search ability of particle swarm optimization （PSO）, a multi-population PSO based on pyramid model （PPSO） is presented. Then, it is applied to solve the layout optimization problems against the background of an international commercial communication satellite （INTELSAT-Ⅲ） module. Three improvements are developed, including multi-population search based on pyramid model, adaptive collision avoidance among particles, and mutation of degraded particles. In the numerical examples of the layout design of this simplified satellite module, the performance of PPSO is compared to global version PSO and local version PSO （ring and Neumann PSO）. The results show that PPSO has higher computational accuracy, efficiency and success ratio.

关键词： Particle swarm optimization Pyramid model Layout design Satellite module

准噶尔盆地玛湖凹陷中部地区多层系油气成藏条件及勘探前景

在线全文

学校读者我要写书评

暂无评论

石油学报 2024年第5期45卷 771-786,816页

作者：张磊魏小松唐勇郑孟林严德天张宝张铭轩袁铎恩中国石油新疆油田公司勘探开发研究院新疆克拉玛依834000 中国地质大学(武汉)构造与油气资源教育部重点实验室湖北武汉430074

玛湖凹陷中部(玛中)地区油气勘探在二叠系—侏罗系获得了工业油流和良好的油气显示,但目前其整体勘探程度较低,油气富集条件、成藏模式及主控因素的系统研究较为薄弱,深入认识玛中地区多层系油气的成藏条件与有利区分布,是提高油气勘探... 详细信息

玛湖凹陷中部(玛中)地区油气勘探在二叠系—侏罗系获得了工业油流和良好的油气显示,但目前其整体勘探程度较低,油气富集条件、成藏模式及主控因素的系统研究较为薄弱,深入认识玛中地区多层系油气的成藏条件与有利区分布,是提高油气勘探成效的关键。基于最新岩心、测井、连井和地震资料分析以及岩石薄片观察等,系统论述了玛中地区的烃源岩特征、主要目的层系(二叠系下乌尔禾组、三叠系百口泉组和白碱滩组以及侏罗系八道湾组)的沉积特征和储层控制因素,明确了多层系油气富集层位及油气的立体成藏模式,为下一步勘探提供了前瞻性预测。研究结果表明,广泛发育的走滑断裂体系沟通了下伏二叠系烃源岩,断层和不整合面将油气垂向或侧向输运到二叠系下乌尔禾组和三叠系百口泉组,并进一步通过断层输送至浅层形成油气聚集;下乌尔禾组和百口泉组中,呈广覆式分布的扇三角洲前缘相贫泥砾岩储层和退积型扇三角洲相与晚期大套泥岩组成的良好储-盖组合是玛湖凹陷获得大面积油气成藏的关键;白碱滩组和八道湾组的薄层砂砾岩储层与大套泥岩组成的良好储-盖组合是玛中地区浅层油气成藏的关键。综合分析认为,玛中地区百口泉组一段上亚段及下乌尔禾组扇三角洲前缘砂体可发育优质储层,具备形成大型地层圈闭的条件;玛中地区白碱滩组二段和八道湾组一段辫状河三角洲前缘薄层砂砾岩发育优质储层,具备形成岩性圈闭的条件;以上均为玛中地区下一步油气勘探重点层系。

关键词：玛湖凹陷百口泉组下乌尔禾组白碱滩组八道湾组成藏模式

Flight-Based Congestion Pricing Considering Equilibrium Flights in Airport Airside

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2020年第3期8卷 477-491页

作者： bao-Cheng zhang School of Air Traffic Management Civil Aviation University of ChinaTianjin 300300China

Most of the previous works ignore the fact that equilibrium flights in self-profit maximization scenario are totally different from that in joint profit(social welfare)maximization scenario and take price difference(flight fare difference)between the two scenarios as congestion price,which is a passenger-based *** of all,the function of congestion pricing is to alleviate congestion by making airlines reduce flights at peak ***,the equilibrium flights under self-profit maximization should be the same as the ones under joint profit maximization after congestion prices are ***-based congestion pricing method is provided in our *** analysis suggests no role for congestion pricing when total real flight production of all airlines is less than the equilibrium flights under joint profit maximization ***,congestion tolls should be levied to all ***,congestion price can be determined by solving the corresponding equations system.

关键词： Flight-based congestion pricing Cournot game Equilibrium flight Passenger-based congestion pricing Aircraft type