检索结果-南通市图书馆

河南化工 2024年第2期41卷 29-32,36页

作者：张振勇丁明洁陈湘殷甲楠李银峰宋成建河南城建学院材料与化工学院河南省煤盐资源高效清洁利用工程技术研究中心河南平顶山467036

综述了国内外煤焦油加工行业生产技术现状,分析了中国煤焦油加工行业存在的问题,并提出了相应的对策。建议以提升行业的规模化和专业化程度为目标,并针对煤焦油轻组分利用的薄弱环节进行新技术研发,实现煤沥青加工和轻组分高值化利用。

关键词：高温煤焦油对策研究煤沥青加工轻组分

DISACCOMMODATION OF INITIAL SUSCEPTIBIliTY IN AMORPHOUS Fe_(90-x)Ni_xZr_(10) ALLOYS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 340-345页

作者： li yinfeng GUO Huiqun XU Rufeng SHEN Baogen Laboratory of Magnetics,Institute of Physics,Academia Sinica,Beijing,China

The disaccommodation(DA)measurements of initial susceptibility were performed in amorphous Fe_(90-x)Ni_xZr_(10)(x=10,20,30)*** DA was measured for two different amorphous states:as-quenched and pretreated at 537 K for 45 *** all the as- quenched samples,in the isochronal spectra of DA a well defined relaxation peak around 350 K is accompanied by a samll but distinct peak near the Curie temperature of Fe_(90)Zr_(10) phase(T_c=230 K).The reversibility and annealing effect on DA are analyzed within the framework of two-level *** fits of the theory to the experimental data of reversible relaxation processes gave a spectrum,of activation energies and pre- exponential factor.

关键词： amorphous alloy disaccommodation Fe_(90-x) Ni_x Zr_(10)

Two-step model of paleohexaploidy, ancestral genome reshuffling and plasticity of heat shock response in Asteraceae

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2023年第6期10卷 82-95页

作者： Xiangming Kong Yan Zhang Ziying Wang Shoutong Bao Yishan Feng Jiaqi Wang Zijian Yu Feng Long Zejia Xiao Yanan Hao Xintong Gao yinfeng li Yue Ding Jianyu Wang Tianyu Lei Chuanyuan Xu Jinpeng Wang Department of Bioinformatics School of Life Sciencesand Center for Genomics and Computational BiologyNorth China University of Science and TechnologyTangshanHebei 063000China State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of ScienceBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China

An ancient hexaploidization event in the most but not all Asteraceae plants,may have been responsible for shaping the genomes of many horticultural,ornamental,and medicinal plants that promoting the prosperity of the largest angiosperm family on the ***,the duplication process of this hexaploidy,as well as the genomic and phenotypic diversity of extant Asteraceae plants caused by paleogenome reorganization,are still poorly *** analyzed 11 genomes from 10 genera in Asteraceae,and redated the Asteraceae common hexaploidization(ACH)event∼70.7–78.6 million years ago(Mya)and the Asteroideae specific tetraploidization(AST)event∼41.6–46.2 ***,we identified the genomic homologies generated from the ACH,AST and speciation events,and constructed a multiple genome alignment framework for ***,we revealed biased fractionations between the paleopolyploidization produced subgenomes,suggesting the ACH and AST both are allopolyplodization ***,the paleochromosome reshuffling traces provided clear evidence for the two-step duplications of ACH event in ***,we reconstructed ancestral Asteraceae karyotype(AAK)that has 9 paleochromosomes,and revealed a highly flexible reshuffling of Asteraceae *** specific significance,we explored the genetic diversity of Heat Shock Transcription Factors(Hsfs)associated with recursive whole-genome polyploidizations,gene duplications,and paleogenome reshuffling,and revealed that the expansion of Hsfs gene families enable heat shock plasticity during the genome evolution of *** study provides insights on polyploidy and paleogenome remodeling for the successful establishment of Asteraceae,and is helpful for further communication and exploration of the diversification of plant families and phenotypes.

关键词： shuffling shock plasticity

Heterogeneous oxidization of graphene nanosheets damages membrane

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

Science China(Physics,Mechanics & Astronomy) 2019年第6期62卷 45-54页

作者： QianChun Wang XiaoBo Zhai Michael Crowe Lu Gou yinfeng li DeChang li Lei Zhang JiaJie Diao BaoHua Ji Biomechanics and Biomaterials Laboratory Department of Applied Mechanics Beijing Institute of Technology College of Science Xi'an University of Science and Technology Department of Cancer Biology University of Cincinnati College of Medicine MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Science Xi'an Jiaotong University Department of Engineering Mechanics School of Naval Architecture Ocean and Civil Engineering and Key Laboratory of HydrodynamicsShanghai Jiao Tong University Institute of Applied Mechanics Department of Engineering Mechanics Zhejiang University

Graphene-based materials exhibit unique properties that have been sought to utilize for various potential applications. Many studies suggest that graphene-based materials can be cytotoxic, which may be attributed to destructive effects on cell ***, there still are conflicting results regarding interactions between graphene-based materials and lipid membranes. Here,through cryo-electron microscopy(Cryo-EM) and dye-leakage experiments along with in silico methods, we found that graphene oxide nanosheets induce significant membrane damage, while the effect of pristine graphene is negligible. We revealed the importance of heterogeneous oxidization of graphene-based nanosheets in damaging vesicle membranes. Moreover, that not only the oxidization degree but also the oxidization loci and membrane tension play important roles in the cytotoxicity of the graphene-based nanosheets.

关键词： graphene graphene oxide heterogeneous oxidization cytotoxicity lipid membrane

Electrochemical behavior of Jateorhizine at L-aspartic acid modified glassy carbon electrode and analytical application

在线全文

学校读者我要写书评

暂无评论

Electrochemical behavior of Jateorhizine at L-aspartic acid ...

A Highly-sensitive Voltammetric Sensor for Scutellarin Based On Poly-taurine Film Modified Electrode

河南省化学会2016年学术年会

作者： Zihong Pan yinfeng li Xia li Haipeng Zhao Baoxian Ye College of Chemistry and Environmental Engineering Pingdingshan University College of Chemistry and Molecular Engineering Zhengzhou University School of Chemical and Material Engineering Henan University of Urban Construction

A simple but highly sensitive voltammetric method for the determination of Jateorhizine was developed using a poly(L-aspartic acid) modified electrode. The redox character of Jateorhizine was investigated systematically in details. Using electrochemical techniques, some dynamic parameters of electrode reaction were calculated and a reasonable reaction mechanism of Jateorhizine on L-aspartic modified electrode was also dicussed and proposed, which could be a reference for the pharmacological action of Jateorhizine in clinical study. Under optimum conditions, the linear range was from 2.0×10 to 4.0×10 mol L with a low detectable limit 2.0×10 mol L. Therefore, the high sensitivity for Jateorhizine analysis at the proposed electrode was realized, and the proposed method could also be used to detect Jateorhizine in the Chinese medicinal herb Tinospora capillipes Gagnep with satisfactory results.

关键词： Jateorhizine poly(L-aspartic acid) voltammetric sensor liner sweep voltammetry

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

A Highly-sensitive Voltammetric Sensor for Scutellarin Based...

河南省化学会2016年学术年会

作者： yinfeng li Wei liu lingzhi Du Haipeng Zhao Baoxian Ye School of Chemical and Material Engineering Henan University of Urban Construction College of Chemistry and Molecular Engineering Zhengzhou University

A highly-sensitive voltammetric sensor for scutellarin was fabricated via directly electro-polymerization of taurine at glassy carbon electrode. This sensor was simply obtained but displayed greatly improved response for scutellarin. The redox process of scutellarin was investigated systematically and some dynamic parameters of electrode reaction were calculated using electrochemical techniques in details. Under the optimum conditions, the linear range was from 8.0×10 to 4.0×10 mol L with a low detectable limit 8.0×10 mol L. The proposed method was used to determine scutellarin in commercial pharmaceuticals with satisfactory results.

关键词： scutellarin electropolymerization poly-taurine voltammetric sensor

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

智慧社区移动应用设计

华中科技大学学报（自然科学版） 2016年第S1期44卷 215-218页

作者：王雅楠李隐峰李瑜林森西安电子科技大学电子工程学院陕西西安710071

研究并开发了一个集成社区各种服务的智慧移动应用程序,为社区用户提供物业报修、停车管理、网络通信以及常用生活服务.本应用使用MySQL作为系统数据库,通过Objective-C和Java语言在Android和iOS操作系统上进行开发移动客户端应用和基于... 详细信息

研究并开发了一个集成社区各种服务的智慧移动应用程序,为社区用户提供物业报修、停车管理、网络通信以及常用生活服务.本应用使用MySQL作为系统数据库,通过Objective-C和Java语言在Android和iOS操作系统上进行开发移动客户端应用和基于J2EE框架开发的Web管理软件链接,实现了将各种社区服务集成到移动应用中的目标.对智慧社区移动应用软件架构及设计方案进行阐述,给出了网络系统组成和各个模块功能分析,通过云测试平台对所开发移动应用进行了测试.测试结果表明智慧社区移动应用程序具有良好的兼容性.本应用已在西安电子科技大学社区投入使用,是互联网+社区服务的一个案例,具有一定的实用性和参考价值.

关键词：移动应用程序数据库 Web Java Android iOS

基于熵权改进-TOPSIS法的扇区复杂度评估方法

在线全文

学校读者我要写书评

暂无评论

交通信息与安全 2023年第6期41卷 142-151页

作者：蒋薇李印凤华北理工大学应急管理与安全工程学院河北唐山063210

扇区复杂度评估是开展空域规划、制定空域资源调配策略的关键和基础,为解决复杂度评估多因素耦合影响及现有评估方法简单和主观性问题,研究提出基于熵权改进-TOPSIS法的扇区复杂度评估方法。针对扇区运行特点,从空域静态结构、交通运行... 详细信息

扇区复杂度评估是开展空域规划、制定空域资源调配策略的关键和基础,为解决复杂度评估多因素耦合影响及现有评估方法简单和主观性问题,研究提出基于熵权改进-TOPSIS法的扇区复杂度评估方法。针对扇区运行特点,从空域静态结构、交通运行状态、动态限制情况3个维度,新构了包括航路结构、航空器潜在冲突、恶劣天气等8个具体量化指标,形成了全面反映空域扇区复杂度的多维评估指标体系。运用高斯分布异常值检测处理方法,消除了极端异常值对评估的影响,结合熵权法客观权重计算的优势,建立了更贴近扇区实际运行情况、符合主观认知的基于熵权改进-TOPSIS法的扇区复杂度评估方法。本研究以北京区域扇区为例进行验证分析,以均衡扇区复杂度为标准,分别从多扇区间横向对比和单扇区不同时段对比2个场景对扇区复杂度进行评估分析,并与专家评估结果进行了对比验证。结果表明:2个场景的复杂度均处于不均衡状态,说明当前北京区域空域资源分配在时间和空间这2个维度均存在一定的失衡,依据评估结果,可针对性的开展空域结构调整与交通流优化工作。相较于专家经验评估结果,本方法评估结果与专家主观认知吻合度高达80%,验证了本文方法的可行性、准确性和有效性,相较于专家评估方法,本文方法具有可量化、客观性强、计算便捷等优势。

关键词：空域规划扇区复杂度复杂度评估模型熵权改进-TOPSIS法复杂度评估指标体系

一类非匹配不确定纯反馈非线性系统新型变幂次趋近律滑模控制

在线全文

学校读者我要写书评

暂无评论

工程科学与技术 2017年第5期49卷 164-170页

作者：佃松宜李银锋蒲明陈琳何泉林四川大学电气信息学院四川成都610065

针对以熔化极气体保护焊(gas metal arc welding,GMAW)为代表的一类非匹配不确定纯反馈非线性系统的输出问题,提出一种基于变幂次趋近律的滑模控制方法。首先,采用滑模微分器得到含系统非匹配不确定性干扰的输出一阶导数。得益于终端滑... 详细信息

针对以熔化极气体保护焊(gas metal arc welding,GMAW)为代表的一类非匹配不确定纯反馈非线性系统的输出问题,提出一种基于变幂次趋近律的滑模控制方法。首先,采用滑模微分器得到含系统非匹配不确定性干扰的输出一阶导数。得益于终端滑模有限时间稳定的性能,该方法具有估计精度高、估计误差收敛速度快的优点。然后,提出一种新型的变幂次趋近律,并证明在相同增益下,其趋近速度均快于现有各种趋近律,且具有自适应调节趋近速度的能力,既保证了在全局范围内系统轨迹有限时间趋近滑模面,又避免了在滑模面附近出现抖振。最后,采用变幂次趋近律滑模变结构控制方法和传统趋近律滑模变结构控制方法分别对带有非匹配干扰的GMAW中的弧长进行控制仿真,并对比弧长跟踪效果,分析稳态误差。结果表明,变幂次趋近律滑模变结构方法能够有效的提高系统收敛的快速性,滑模控制方法对于非匹配不确定非线性系具有强鲁棒性。

关键词：非匹配不确定纯反馈滑模

在线全文

学校读者我要写书评

暂无评论

基于阻塞流的多场景终端区容量影响机理

西南交通大学学报 2014年第5期49卷 928-934页

作者：李印凤胡明华彭瑛王宏伟南京航空航天大学民航学院江苏南京211106

为研究终端区容量的影响因素及变化规律和趋势,基于终端区运行特性分析,综合考虑航线长度、飞行速度、管制间隔等因素,采用阻塞流理论和方法,建立了终端区容量网络模型.以杭州萧山机场终端区为例,构建了恶劣天气发生位置、双跑道运行模... 详细信息

为研究终端区容量的影响因素及变化规律和趋势,基于终端区运行特性分析,综合考虑航线长度、飞行速度、管制间隔等因素,采用阻塞流理论和方法,建立了终端区容量网络模型.以杭州萧山机场终端区为例,构建了恶劣天气发生位置、双跑道运行模式等多运行场景,分析了不同因素对终端区容量的作用关系和影响规律.研究结果表明：终端区容量受恶劣天气影响呈不均匀阶梯状递减,下降梯度与航线的可替代性紧密相关,当影响AND方向单一进场航线时,容量下降10-20架次/h;不同的多跑道运行模式下容量相差明显,容量区间在33-108架次/h.

关键词：空域容量影响机理阻塞流航路网络