检索结果-南通市图书馆

A label-free lateral offset spliced coreless fiber MZI biosensor based on hydrophobin HGFI for TNF-α detection

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2022年第5期18卷 263-268页

作者： WANG bo DUAN Shaoxiang ZHANG Hao XU Haijin LIU Bo QIAO Mingqiang The Key Laboratory of Molecular Microbiology and Technology Ministry of EducationNankai UniversityTianjin 300071China Institute of Modern Optics Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyNankai UniversityTianjin 300350China School of Life Science Shanxi UniversityTaiyuan 030006China1

A real-time label-free lateral offset spliced coreless fiber(CF)Mach-Zehnder interferometer(MZI)biosensor functionalized with hydrophobin Grifola frondosa I(HGFI)was proposed for the detection of cytokine tumour necrosis factor alpha(TNF-α).The nanolayer self-assembled on the optical fiber surfaces by HGFI rendered the immobilization of probe TNF-αantibody and recognition of antigen TNF-α.Trifluoroacetic acid was utilized to remove the HGFI layer from the glass surface,which was validated by field emission scanning electron microscopy(FESEM)and water contact angle(WCA).Results demonstrated that the processes of HGFI modification,antibody immobilization and specific antibody detection can be monitored in real time.The proposed biosensor exhibited good specificity,repeatability and low detection limit for TNF-α,extending its application in inflammation and disease monitoring.

关键词： fiber interferometer offset

在线全文

学校读者我要写书评

暂无评论

非正规经济社会核算矩阵的框架设计研究

统计与信息论坛 2018年第4期33卷 25-31页

作者：刘波李金昌浙江财经大学数据科学学院浙江杭州310018

非正规经济已经渗透到经济活动的各个方面,综合分析其对宏观经济的影响效应亟须一个系统性框架。阐释采用社会核算矩阵研究非正规经济活动的3个必要性,厘清非正规经济运行机理及其与正规经济之间的4条作用路径,在阐述非正规经济SAM各账... 详细信息

非正规经济已经渗透到经济活动的各个方面,综合分析其对宏观经济的影响效应亟须一个系统性框架。阐释采用社会核算矩阵研究非正规经济活动的3个必要性,厘清非正规经济运行机理及其与正规经济之间的4条作用路径,在阐述非正规经济SAM各账户的基础上设计非正规经济SAM的表式结构和基本框架,归纳非正规经济SAM的3大功能。对非正规经济SAM的理论分析与框架设计可以为非正规经济SAM的编制与效应研究奠定理论基础。

关键词：非正规经济社会核算矩阵账户设计

Effect and Mechanism of Rare Earth Hydrotalcite Inhibiting Coal Spontaneous Combustion

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 50-59页

作者：张小娟 LIU Bo 罗振敏 SUN Lu School of Safety Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China

A hydrotalcite(layered double hydroxide, LDH) inhibitor which is suitable for the whole process of coal spontaneous combustion and a LDH inhibitor containing rare earth lanthanum elements were prepared. The inhibition effect and mechanism were analyzed by scanning electron microscopy(SEM),X-ray diffraction(XRD), thermal performance analysis, in-situ diffuse reflectance infrared spectroscopy and temperature-programmed experiment. The results have shown that the inhibitor containing lanthanum can play a good inhibitory role in every stage of coal oxidation. During the slow oxidation of coal samples, the inhibitor containing lanthanum ions can slow down the oxidation process of coal and increase the initial temperature of coal spontaneous combustion. At the same time, because the hydroxyl groups in LDHs are connected with-COO-groups on the coal surface through hydrogen bonds, the stability of coal is improved. With the increase of temperature, LDHs can remove interlayer water molecules and reduce the surface temperature of coal. CO release rate of coal samples decreases significantly after adding inhibitor containing lanthanum element, and the maximum inhibition rate of the inhibitor is 58.1%.

关键词： rare earth hydrotalcite coal spontaneous combustion mechanism

Chiral Pool Guided Syntheses of Polycyclic Natural Products

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2022年第3期40卷 407-418页

作者： Shaomin Fu bo liu Key Laboratory of Green Chemistry&Technology of Ministry of Education College of ChemistrySichuan University29 Wongjiang Rd.ChengduSichuan 610064China

Chiral pools have been commonly utilized as inexpensive and versatile building blocks in organic synthesis.In this account,we provide an overview of our recent synthetic efforts toward polycyclic natural products using chiral natural small molecules(chiral pool)as starting materials.Key achievements during our syntheses include intermolecular Diels-Alder/intramolecular hetero-Diels-Alder cascade to enable modification of previously proposed biosynthetic pathway of bolivianine,Diels-Alder-type dimerization through a conjugated furanyl diene intermediate to achieve three types of lindenane[4+2]dimers,Iron-catalyzed reductive aldol reaction to construct core of rumphellclovane E and[3,3]-rearrangement along with vinylo-gous Pummerer rearrangement to make epoxyquinol substructure of JBIR-23/-24.In the final,the outlook is also presented.

关键词： Chiral pool Natural products Total synthesis Polycylic Cascade reaction

Porosity of gas shale:Is the NMR-based measurement reliable?

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

Petroleum Science 2022年第2期19卷 509-517页

作者： Peng Zhao bo He bo Zhang Jun liu Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) College of Architecture and EnvironmentSichuan UniversityChengduSichuan 610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengduSichuan 610065China Institute of Science and Technology China Three Gorges CorporationBeijing100038China

Aiming at obtaining an accurate porosity of gas shale,various approaches are attempted.Therein,nuclear magnetic resonance(NMR),being treated as a kind of new-developed technique,possesses the representative significance.However,as a booming technique,the reliability of NMR-based porosity of shale is not exactly defined.Depending on NMR device,this work measured the porosity of shale experiencing different water soaking time,accordingly,judging the reliability of NMR-based porosity.Results indicate the NMR outcomes vary with the water soaking time,making a doubt about the objectivity of NMRbased porosity in reflecting the real shale porosity.Furthermore,some supplementary means were adopted to verify the water soaking-induced variation in the pore system of shale sample,which intensities the suspicion if the NMR-based porosity is reliable or not.To sum up,this work considers that the NMR-based porosity of shale is not reliable enough when water is used as the probe.Besides,this work also offers some suggestions on how to enhance the reliability of NMR-based porosity of shale sample.Basically,this work selects a fresh perspective to analyze the NMR approach in determining shale porosity,which is hopefully helpful in promoting the development of NMR technique in the shale-related field.

关键词： Gas shale Low-field NMR Porosity measurement Low-temperature nitrogen adsorption

在线全文

学校读者我要写书评

暂无评论

冷轧钛带罩式退火氧化原因分析及控制

世界有色金属 2022年第5期47卷 1-3页

作者：申瑞刘喜波李渤渤洛阳双瑞精铸钛业有限公司河南洛阳471000 中国船舶集团有限公司第七二五研究所河南洛阳471000

钛卷罩式退火应用广泛,但由于钛金属化学性质活泼,高温退火过程中极易发生退火氧化缺陷,是钛卷生产企业普遍面临的技术难题之一。本文通过分析罩式退火炉的设备组成和工艺流程,阐述了炉内氧化性气氛的来源,并从设备、原料、操作等方面... 详细信息

钛卷罩式退火应用广泛,但由于钛金属化学性质活泼,高温退火过程中极易发生退火氧化缺陷,是钛卷生产企业普遍面临的技术难题之一。本文通过分析罩式退火炉的设备组成和工艺流程,阐述了炉内氧化性气氛的来源,并从设备、原料、操作等方面对钛卷氧化进行了细致的分析和研究,最后综合各种原因,得出钛卷罩式退火氧化的控制方法,通过这些方法可以有效减少钛卷罩式退火氧化缺陷,提高钛卷品质。

关键词：罩式退火钛卷氧化污染真空度

Computational Study on the boundary Layer Suction Effects in the Supersonic Compressor Flow with a bowed Blade

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第2期31卷 511-528页

作者： CAO Zhiyuan SONG Cheng GAO Xi ZHANG Xiang LIU Bo School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China

Flow control methodologies have been widely used to eliminating flow separation and increasing the blade load in axial compressor.Aiming at revealing the flow mechanism of coupled bowed blading and boundary layer suction in a supersonic compressor cascade,a cascade with a diffusion coefficient of 0.62 is numerically presented.First of all,according to the available experimental data,the numerical method was validated;then,different bowed blading effects on flow field in detail were investigated;at last,based on the flow physics of purely bowed blading,the positively bowed blade was coupled with boundary layer suction on blade suction surface,whereas the negatively bowed blade was coupled with endwall suction.For coupled control method,influence mechanism on flow field,especially on the shock structure was revealed,and different aspect ratios of coupled control method were investigated as well.Results showed that the coupled positively bowed blading and suction surface suction can eliminate the flow separation effectively.Compared with that of baseline supersonic cascade,the total pressure loss coefficient of the coupled scheme was reduced by 37.4%at most.At mid-span,the shock moved downstream and the single shock was separated to a dual-shock structure since the positively bowed blading reduced the static pressure of mid-span.The coupled negatively bowed blading and endwall suction also effectively enhanced the performance of cascade by removing the corner separation,with the loss coefficient reduced by as much as 41.9%.However,the suction coefficient of optimal coupled negatively bowed blading scheme reached 10.5%,which is too high for practical use.After coupled control,the 3 D shock structure became“C”shaped distribution along spanwise because of the difference in influence mechanism of negatively bowed blading on different spanwise location.Due to the opposite influence effect of positively and negatively bowed blading,the shock structure in the two different schemes of cascades were different and showed oppo

关键词： supersonic compressor cascade bowed blading boundary layer suction shock aspect ratio

Biogenesis,action and biological functions of an Arabidopsis 5' t RF,5' ts R-Ala

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2022年第5期65卷 1050-1052页

作者： Chunyan liu bo Cao Xiaofeng Cao State Key Laboratory of Plant Genomics and National Center for Plant Gene Research(Beijing) Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China State Key Laboratory of Microbial Metabolism School of Life Sciences&BiotechnologyShanghai Jiao Tong UniversityShanghai 200030China Center for Excellence in Molecular Plant Sciences Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Transfer RNAs(tRNAs) are one class of most conserved and abundant RNA species with 76–90 nucleotides(nt) in length.They constitute approximately 4%–15% of total cellular RNAs and are well known for translating the c... 详细信息

关键词： action translating Toll

Application of a p-version curved C^(1)finite element based on the nonlocal Kirchhoff plate theory to the vibration analysis of irregularly shaped nanoplates

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第10期66卷 3025-3047页

作者： XIANG Wei NI Hua TIAN YiFeng WU Yang LIU Bo School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province Chengdu 610031China Southwest China Research Institute of Electronic Equipment Chengdu 610036China CAEP Software Center for High Performance Numerical Simulation Beijing 100088China Institute of Applied Physics and Computational Mathematics Beijing 100088China The Solid Mechanics Research Centre Beihang University(BUAA)Beijing 100191China

Nanoplates have been widely used as elementary components for ultrasensitive and ultrafine resolution applications in the field of nano-electro-mechanical systems because of their potentially remarkable mechanical properties.The accurate analysis of their mechanical behavior is currently of particular interest in the function design and reliability analysis of nano-scaled devices.To examine the size-dependent bending and vibration behavior of nanoplates with curvilinear and irregular shapes,a new p-version curved C^(1)finite element is formulated in the framework of the nonlocal Kirchhoff plate model.This newly developed element not only enables an accurate geometry representation and easy mesh generation of curvilinear domains but also overcomes the difficulty of imposing C^(1)conformity required by the nonlocal Kirchhoff plate model,particularly on the curvilinear inter-element boundaries.Numerical examples show that this element can produce an exponential rate of convergence even when curved elements are used in the domain discretization.Vast numerical results are presented for nanoplates with various geometric shapes,including rectangular,circular,elliptic,annular,and sectorial.The high accuracy of the present element is verified by comparing the obtained results with analytical and numerical results in the literature.Additionally,a comprehensive parametric analysis is conducted to investigate the influences of nonlocal parameters,plate dimensions,and boundary conditions on the nonlocal behavior of nanoplates.The present element can be envisaged to allow large-scale mechanical simulations of nanoplates,with a guarantee of accuracy and efficiency.

关键词： nanoplates nonlocal theory p-version finite element method C^(1)conformity irregular shape