检索结果-南通市图书馆

Numerical simulation of the effect of coaxial and cross-axis injection modes on pulverized coal combustion in the raceway of blast furnace tuyere

引用

PARTICUOLOGY 2024年第10期93卷 154-169页

作者： Wang, Yunpeng Gao, Lei zhou, xiaolei Kunming Univ Sci & Technol Fac Met & Energy Engn Kunming 650093 Peoples R China

The aim of this study isto investigate the influence of the angle of the pulverized coal (PC) injection lance on the combustion characteristics of fuel in the raceway of blast furnace tuyeres. Using FLUENT software, a Euler-Lagrange three-dimensional numerical model was constructed to analyze the influence of different positions of blast furnace tuyere coal powder injection lance (coaxial and cross-axis) on key parameters such as temperature distribution, gas flow, and combustion efficiency. The results demonstrate that adjusting the angle of the injection lance significantly modifies the average and peak temperatures in the raceway, while the composition of gas components remains relatively stable. When the injection lance angle is 10 degrees, the average temperature and peak temperature in the raceway are 2294 K and 2747 K, respectively. When the injection lance angle is 12 degrees, the combustion efficiency of the PC reaches 80.8%. This study reveals the significant impact of the injection lance angle on the combustion process. Especially at an angle of 12 degrees, the combustion efficiency of the blast furnace significantly improves. With coaxial injection, the combustion rate increases as the distance between the injection lance tip and the tuyere increases. This paper is instructive for the optimization of the blast furnace combustion system, which improve fuel utilization efficiency and reduce environmental emissions. This paper provides practical recommendations for adjusting blast furnace operational parameters, offering insights for achieving more efficient and environmentally friendly industrial production. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Pulverized coal combustion Tuyere raceway Blast furnace CFD simulation GAS FLOWS CFD

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

Composition design and performance evaluation of rubber-particle cement-stabilized gravel

引用

Frontiers of Structural and Civil Engineering 2024年第9期18卷 1466-1477页

作者： Chaohui WANG Ke YI Feng CHEN Luqing LIU xiaolei zhou Zhiwei GAO School of Highway Chang’an UniversityXi’an 710064China Shaanxi Transportation Technology Consulting Co. Ltd.Xi’an 710068China School of Information Engineering Xizang Minzu UniversityXianyang 71208China

To improve the mechanical properties and durability of the cement-stabilized base,rubber particles of three different sizes and with three different contents were optimally selected,the evolution laws of the mechanical strength and toughness of rubber-particle cement-stabilized gravel(RCSG)under different schemes were determined,and the optimal particle size and content of rubber particles were *** this basis,the durability of the RCSG base was *** results show that with an increase in the rubber particle size and content,the mechanical strength of RCSG gradually decreased,whereas the toughness and transverse deformation ability gradually increased.1%content and 2–4 mm sized RCSG can better balance the relationship between mechanical strength and *** 7 d unconfined compressive strength was 17.7%higher than that of the 4–8 mm *** 28 d toughness index and ultimate splitting strain can be increased by 9.8%and 6.3 times,respectively,compared with ordinary cement-stabilized gravel(CSG).In terms of durability,compared with CSG,RCSG showed a 3.7%increase in the water stability property of cement-stabilized base with 1%content and 2–4 mm rubber particles,5.5%increase in the frozen coefficient,and 80.6%and 37.9%increase in the fatigue life at 0.70 and 0.85 stress ratio levels,respectively.

关键词： pavement materials cement-stabilized gravel rubber particles material components mechanical property durability performance

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

Study on metal recovery process and kinetics of oxidative leaching from spent LiFePO_(4)Li-batteries

引用

Chinese Journal of Chemical Engineering 2024年第4期68卷 94-102页

作者： Xiaoming Zhang Wen Xie xiaolei zhou Wenjie Zhang Jiawei Wen Xin Wang Guoyong Huang Shengming Xu College of New Energy and Materials China University of PetroleumBeijing 102249China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of PetroleumBeijing 102249China Beijing Spacecrafts Beijing 100094China Ganfeng Lithium Group Co. Ltd.Xinyu 338000China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Fine Ceramics Tsinghua UniversityBeijing 100084China

A green environmental protection and enhanced leaching process was proposed to recover all elements from spent lithium iron phosphate(LiFePO_(4)) lithium *** order to reduce the influence of Al impurity in the recovery process,NaOH was used to remove *** impurity removal,the spent LiFePO_(4) cathode material was used as raw material under the H_(2)SO_(4) system,and the pressure oxidation leaching process was adopted to achieve the preferential leaching of *** E-pH diagram of the Fe-P-Al-H_(2)O system can determine the stable region of each element in the recovery process of spent LiFePO_(4)*** the optimal conditions(500 r·min^(-1),15 h,363.15 K,0.4 MPa,the liquid-solid ratio was 4:1 ml·g^(-1)and the acid-material ratio was 0.29),the leaching rate of Li was 99.24%,Fe,Al,and Ti were 0.10%,2.07%,and 0.03%,*** Fe and P were precipitated and recovered as FePO_(4)·2H_(2)*** kinetic analysis shows that the process of high-pressure acid leaching of spent LiFePO_(4) materials depends on the surface chemical *** the life cycle assessment(LCA)of the spent LiFePO_(4) whole recovery process,eight midpoint impact categories were selected to assess the impact of recovery *** results can provide basic environmental information on production process for recycling industry.

关键词： Spent LiFePO_(4)Li-batteries Oxidative leaching Kinetic study Life cycle assessment

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

间充质干细胞外泌体抗肝纤维化的机制及其优化策略

引用

中国生物工程杂志 2024年第6期44卷 41-52页

作者：周晓磊徐岩金煜叶俊松赣南医科大学赣州341000 赣南医科大学第一附属医院干细胞临床转化分中心赣州341000 赣州市干细胞与再生医学重点实验室赣州341000 赣南医科大学江西省医用组织工程材料与生物制造重点实验室赣州341000 赣南医科大学心脑血管疾病防治教育部重点实验室赣州341000

肝纤维化是肝脏疾病治疗领域的一大难题。间充质干细胞可用于治疗肝纤维化,但因其可能的致癌性、促癌性及移植所需细胞量大等问题受到限制。近年来,间充质干细胞外泌体以更小的体积、更低的免疫原性、无致癌性等优势逐渐成为研究热点。... 详细信息

肝纤维化是肝脏疾病治疗领域的一大难题。间充质干细胞可用于治疗肝纤维化,但因其可能的致癌性、促癌性及移植所需细胞量大等问题受到限制。近年来,间充质干细胞外泌体以更小的体积、更低的免疫原性、无致癌性等优势逐渐成为研究热点。然而,间充质干细胞外泌体在临床应用上也受到限制:首先,目前对不同种类间充质干细胞外泌体的提取与鉴定缺乏更为标准统一的方式;其次,间充质干细胞外泌体治疗肝纤维化的机制尚不清晰;最后,间充质干细胞外泌体治疗存在靶向活化的肝星状细胞(aHSC)能力弱、外泌体产量低、载药能力和递送效率低等问题。鉴于以上原因,对引起常见间充质干细胞外泌体提取效果差异的因素、间充质干细胞外泌体改善肝纤维化的机制及其优化策略进行综述,为间充质干细胞外泌体治疗肝纤维化提供新理解、新思路。

关键词：间充质干细胞外泌体肝纤维化机制优化策略

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

气候变化背景下的天山云杉潜在分布区预测

引用

干旱区研究 2024年第7期41卷 1167-1176页

作者：周杰王旭虎杜维波周晓雷杨洁张晓玮甘肃农业大学林学院甘肃兰州730070 甘肃农业大学草业学院甘肃兰州730070

天山云杉(Picea schrenkiana)是天山地区最主要的树种之一,为天山山地的水土保持和水源涵养发挥着重要的作用。本文基于气候相似性原理以最大熵(MaxEnt)模型为基础结合ArcGIS预测当前(2000—2020年)与2020—2040年、2040—2060年两个时... 详细信息

天山云杉(Picea schrenkiana)是天山地区最主要的树种之一,为天山山地的水土保持和水源涵养发挥着重要的作用。本文基于气候相似性原理以最大熵(MaxEnt)模型为基础结合ArcGIS预测当前(2000—2020年)与2020—2040年、2040—2060年两个时段3种气候情景低温室气体排放条件(SSP1-2.6)、中温室气体排放条件(SSP3-7.0)和高温室气体排放条件(SSP5-8.5)下天山云杉的潜在分布范围,并分析影响天山云杉分布的主要环境因子。结果表明:(1)MaxEnt模型对天山云杉的分布区预测可信度高,所有模型AUC值均大于0.99。温度(等温性、季节性温度变异、年平均温度)与降水(最冷季度的降水量、最湿月的降水量、最干季度的降水量)是影响天山云杉潜在分布的主导因子;其中温度为当前主要的影响因子,最冷季度的降水量为未来的主要影响因子。(2)当前时期天山云杉的适生区主要分布在新疆、青海、内蒙古、西藏、甘肃、宁夏、陕西、四川等地区的山区,总适生区面积为299.17×10^(4)km^(2),高适区面积为49.45×10^(4)km^(2)。未来各情景下天山云杉的潜在适生区面积变化不大且分布仍以这些地区为主,但高适生区较当前均表现增加。除2020—2040年SSP5-8.5情景下天山云杉的适宜分布向东南方向迁移外,其他情景天山云杉的适宜分布有向西扩展的趋势。

关键词：最大熵(MaxEnt)模型气候变化潜在分布区天山云杉

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

不同策略提高间充质干细胞治疗肝纤维化:效果与潜在风险分析

引用

中国组织工程研究 2025年第23期29卷 5002-5012页

作者：徐岩王雪淞周林周晓磊金煜叶俊松赣南医科大学第一附属医院干细胞临床转化分中心江西省赣州市341000 赣南医科大学康复学院江西省赣州市341000 赣州市干细胞与再生医学重点实验室江西省赣州市341000 组织工程江西省重点实验室江西省赣州市341000 心脑血管疾病防治教育部重点实验室江西省赣州市341000

背景:目前大量研究表明,间充质干细胞联合不同治疗策略能更有效地改善肝纤维化,抑制其向终末期肝病发展。目的:探讨间充质干细胞联合不同策略改善肝纤维化疗效优于单独间充质干细胞治疗的相关机制。方法:由第一作者应用计算机在中国知... 详细信息

背景:目前大量研究表明,间充质干细胞联合不同治疗策略能更有效地改善肝纤维化,抑制其向终末期肝病发展。目的:探讨间充质干细胞联合不同策略改善肝纤维化疗效优于单独间充质干细胞治疗的相关机制。方法:由第一作者应用计算机在中国知网、万方、维普、PubMed、Web of Science和Nature数据库中检索涉及间充质干细胞联合不同策略改善肝纤维化的研究,中文检索词为“间充质干细胞,肝纤维化,联合治疗,肝星状细胞”,英文检索词为“mesenchymal stem/stromal cells,liver/hepatic fibrosis/cirrhosis,combination therapy,hepatic stellate cells/HSCs”,通过快速浏览文章题目及摘要进行筛选,排除与主题关系不密切的文章,最终筛选出104篇文献进行综述分析。结果与结论:间充质干细胞通过分化为肝样细胞、抑制肝星状细胞活化、免疫调节等机制来改善肝纤维化,但间充质干细胞移植后肝脏定植率低、存活率低、作用时间短等原因限制了其临床应用。间充质干细胞联合药物、基因修饰、细胞因子等多种治疗策略改善肝纤维化的疗效优于间充质干细胞单独治疗,并且间充质干细胞联合不同策略通过促进间充质干细胞归巢、抑制肝星状细胞活化、调节微环境、调控信号通路等机制更有效地改善肝纤维化。间充质干细胞还可以通过预处理、miRNA调控及与其他细胞联合,使间充质干细胞在减轻肝纤维化方面表现出更好的肝源性分化、归巢和存活功能。间充质干细胞联合不同策略并不能规避间充质干细胞单独治疗肝纤维化的潜在风险,而且这些策略(药物、基因修饰和细胞因子等)自身安全性也值得考虑。此外,间充质干细胞移植数量和途径等有待进一步研究。

关键词：间充质干细胞肝纤维化肝星状细胞信号通路联合用药基因修饰归巢微RNA

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

A Cumulative Prospect Theory Based Counterterrorism Resource Allocation Method under Interval Values

引用

Journal of Systems Science and Systems Engineering 2019年第4期28卷 478-493页

作者： Bingfeng Ge Xiaoxiong Zhang xiaolei zhou Yuejin Tan College of Systems Engineering National University of Defense TechnologyChangsha 410073 China The Sixty-third Research Institute National University of Defense Technology Nanjing 210007 China

Strategic resource allocation into decision-making model plays a valuable role for the defender in mitigating damage and improving efficiency in military *** this paper,we develop a defensive resource allocation model based on cumulative prospect theory (CPT),which considers terrorists' psychological factors of decision-making in *** specifically,we extend existing models in the presence of multiple attributes and terrorists' deviations from rationality using a multi-attribute cumulative prospect *** addition,interval values are used to cope with uncertainties regarding gain and *** studies are also carried out to demonstrate the differences among minmax,Nash equilibrium (NE),and traditional probability risk analysis (PRA) *** show that the defender's optimal defensive resource allocation will change along with terrorists' behaviors and the proposed model makes more sense compared with other traditional resource allocation strategies.

关键词： Counterterrorism resource allocation cumulative prospect theory multiple attributes interval value

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

Passive-Event-Assisted Approach for the Localizability of Large-Scale Randomly Deployed Wireless Sensor Network

引用

Tsinghua Science and Technology 2019年第2期24卷 134-146页

作者： Zhiguo Chen Guifa Teng xiaolei zhou Tao Chen Collegeof Information Science and Technology Agricultural University of Hebei Nanjing Telecommunication Technology Research Institute National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory National University of Defense Technology

Localizability in large-scale, randomly deployed Wireless Sensor Networks(WSNs) is a classic but challenging issue. To become localizable, WSNs normally require extensive adjustments or additional mobile nodes. To address this issue, we utilize occasional passive events to ease the burden of localization-oriented network adjustment. We prove the sufficient condition for node and network localizability and design corresponding algorithms to minimize the number of nodes for adjustment. The upper bound of the number of adjusted nodes is limited to the number of articulation nodes in a connected graph. The results of extensive simulations show that our approach greatly reduces the cost required for network adjustment and can thus provide better support for the localization of large-scale sparse networks than other approaches.

关键词： network localizability random deployment Wireless Sensor Networks (WSNs) passive event

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

Enabling entity discovery in indoor commercial environments without pre-deployed infrastructure

引用

Frontiers of Computer Science 2019年第3期13卷 618-636页

作者： Bo YUAN xiaolei zhou Xiaoqiang TENG Deke GUO Science and Technology on Information Systems Engineering Laboratory National University of Defense Technology Changsha 410073 China

Finding entities of interest in indoor commercial places, such as the merchandise in supermarkets and shopping malls, is an essential issue for customers, especially when they are unfamiliar with an ad hoc indoor environment. This type of location-based indoor service requires comprehensive knowledge of indoor entities, including locations as well as their semantic information. However, the existing indoor localization approaches fail to directly localize these general entities without dedicated devices. This paper first focuses on the problem of discovering large-scale general entities of interest in indoor commercial spaces without pre-deployed infrastructure. We present a unique entity localization approach that leverages the localization results from multiple independent users to accurately determine the location of corresponding entities. Our key idea is to exploit the short-distance estimation with dead reckoning to guarantee the accuracy of entity localization. We develop a prototype system based on the crowdsourcing method, iScan, and test it in one of the biggest supermarkets in Changsha, China, to validate the performance of our design. Extensive experimental results show that our approach can achieve meter-level accuracy in a single day with 70 participants. Moreover, in a monthly evaluation with 500 effective participants, iScan discovered more than 200 entities and localized approximately 75% of them within 2 m.

关键词： indoor localization entity discovery crowdsourcing system location-based service

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

LED光质对太子参生长和主要功能成分的影响

引用

中国农业大学学报 2024年第10期29卷 139-150页

作者：黄燕芬周小雷李翠简少芬郭昌锋郭晓云广西壮族自治区药用植物园国家中医药传承创新中心/广西药用资源保护与遗传改良重点实验室/广西壮族自治区中药资源智慧创制工程研究中心南宁530023

为探究不同LED光质对太子参生长和主要功能成分含量的影响,以太子参实生苗为研究材料,设置LED光源为蓝光(B)、红光(R)和红蓝光组合(R∶B=2∶1、R∶B=4∶1、R∶B=6∶1、R∶B=8∶1、R∶B=10∶1)共7个不同光质的处理,测定各处理下30和120 ... 详细信息

为探究不同LED光质对太子参生长和主要功能成分含量的影响,以太子参实生苗为研究材料,设置LED光源为蓝光(B)、红光(R)和红蓝光组合(R∶B=2∶1、R∶B=4∶1、R∶B=6∶1、R∶B=8∶1、R∶B=10∶1)共7个不同光质的处理,测定各处理下30和120 d太子参生长指标及120 d太子参主要功能成分含量及产量,综合生长与含量的隶属函数值,确定太子参的最适光处理。结果表明:光质对太子参生长影响显著,不同生长时期的植株响应有所不同。红光及红蓝组合光显著提高30 d太子参除根数以外的生长指标,120 d太子参的生长随着红光比例的增加表现出先增加后下降的趋势。红光下30 d太子参叶片总叶绿素含量显著低于红蓝组合光,而120 d太子参叶片叶绿素含量在多数处理间差异不显著。不同光质对太子参功能成分含量和产量影响显著,红光显著提高总皂苷和太子参环肽B含量,单一蓝光显著降低多糖含量,所有处理下氨基酸含量低于药材标准品,以上成分产量随红光比例的增加呈先上升后下降的趋势,在R∶B=8∶1下显著高于其他处理。综上,红蓝组合光处理下太子参植株生物量和功能成分积累较高,但在不同时期的最佳组合比例不同,R∶B=10∶1有利于太子参苗期植株生长,R∶B=8∶1有利于中后期太子参根生长及功能成分积累。

关键词：太子参红蓝光生长指标功能成分含量

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：