检索结果-南通市图书馆

Thermally Conductive Study of Polyethylene/Al2O3 Composite Networks Cross-linked by Electron Beam Irradiation

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2020年第5期36卷 940-945页

作者： SHI Chengying YANG Jiayu LIU Yang WANG Yanmiao xu wenge xu Yiquan HU Wei LIU Baijun Key Laboratory of High Performance Plastics Ministry of EducationNational&Local Joint Engineering Laboratory for Synthesis Technology of High Performance PolymerCollege of CheniistiyJilin UniversityChangchun 130012P.R.China Changchun Radiation Technology Co. Ltd.China Isotope&Radiation Corporation(CIRC)Changchun 130102P.R.China Changchun Kinwa High Technology Co. Ltd.Changchun 130102P.R.China Key Laboratory of Polyoxonietalate Science Kfinistiy of EducationFaculty of ChemistryNortheast Normal UniversityChangchun 130024P.R.China

The surface-modifled Al2O3 particles were introduced into polyethylene(PE)to enhance the thermal conductivity,and PE/Al2O3 cross-linked networks with improved thermal and mechanical properties were prepared through electron beam(EB)irradiation *** incorporation of reactive irradiation sensitizer was useful in fabricating a high degree of cross-linking(DC)PE networks under a low irradiation *** the PE sample containing 2%sensitizer,DC ca.67.1%could be obtained under 60 kGy(1 kGy=1000 J/kg).EB-irradiation greatly improved thetensile stress of PE-based samples,and the tensile stresses of the samples with 0.2—5%TMPTA(trimethylolpr pane triacrvlate)under 60 kGy were 24.61—27.77 *** the EB-irradiated samples had higher Vicat softening temperatures than the samples without *** treatment at 120 kGy,the Vicat softening temperatures of PE-Al2O3-44/TMPTA-2 increased from 127℃to 130.4℃.SEM images revealed that PE-Al2O3-5O samples with increased amount of Al2O3 particles showed a conduction"pathway,"and thennal conductivity reached 0.67 W/(m·K).Thus,high-performance pipes were extruded,which could satisfy the static hydraulic blasting test and exhibit improved thennal conduction capability.

关键词： Electron beam(EB)-irradiation Cross-linked network Thermal conductivity

投资如何优化供给结构:基于跨国经验的实证研究

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

社会科学研究 2019年第1期 26-34页

作者：徐文舸中国宏观经济研究院投资研究所

全球87个经济体现阶段的产业结构合成指数呈"抛物线"型上升走势,第三产业的重要性将日益凸显,同时,行业的资本结构变化对产出结构变化呈现显著的同向影响,其中,资本要素在制造业内的高技术水平细分行业与服务业内的低技术水平细分行业... 详细信息

全球87个经济体现阶段的产业结构合成指数呈"抛物线"型上升走势,第三产业的重要性将日益凸显,同时,行业的资本结构变化对产出结构变化呈现显著的同向影响,其中,资本要素在制造业内的高技术水平细分行业与服务业内的低技术水平细分行业皆具有较强的影响效力,行业劳均资本存量的增加则有助于提高增加值率,特别是OECD国家在制造业内的高技术水平细分行业以及非OECD国家在服务业内的低技术水平细分行业的影响效应会更强。目前我国的供给结构水平在全球排名靠后,需要继续优化并补齐现有短板。提高经济发展和技术研发水平、降低政府干预程度,有效利用投资所积累的资本要素,能有效促进行业增加值率的提升,这对投资优化供给结构发挥着关键性作用。

关键词：投资优化供给结构产业结构技术水平增加值率国际定位跨国经验

货币政策取向与货币政策动态调整——对历年《中国货币政策执行报告》的经验研究

在线全文

学校读者我要写书评

暂无评论

金融经济学研究 2015年第4期30卷 3-16页

作者：徐鹏徐文舸南开大学经济学院天津300071

借助2001年第一季度至2014年第四季度《中国货币政策执行报告》,构建起一个货币政策取向衡量框架,然后在此基础上,采用有序选择模型,实证分析了中国货币政策的动态调整行为。研究结果表明,区分货币政策目标重要性的模型能较好地刻画中... 详细信息

借助2001年第一季度至2014年第四季度《中国货币政策执行报告》,构建起一个货币政策取向衡量框架,然后在此基础上,采用有序选择模型,实证分析了中国货币政策的动态调整行为。研究结果表明,区分货币政策目标重要性的模型能较好地刻画中国货币政策取向与产出缺口、通货膨胀缺口之间的动态调整关系;中国货币政策的调控方向和力度会随着宏观经济走势而进行改变,即当通货膨胀缺口为正且较大时,物价稳定便成为政策优先关注的目标,而当产出缺口较小或为负缺口时,经济增长就成为货币政策优先关注的目标。

关键词：货币政策取向动态调整叙述性方法有序选择模型

政府债务影响了经济增长吗?——兼论如何削减债务

在线全文

学校读者我要写书评

暂无评论

投资研究 2018年第5期37卷 98-115页

作者：徐文舸中国宏观经济研究院投资研究所

为验证政府债务对经济增长的非线性影响以及如何削减债务,本文利用1960-2013年OECD国家的面板数据进行综合考察。研究发现,政府债务对经济增长的非线性影响表现为先促进后抑制的倒U型关系,且该临界点位于负债率90%-110%区间之内;同时,... 详细信息

为验证政府债务对经济增长的非线性影响以及如何削减债务,本文利用1960-2013年OECD国家的面板数据进行综合考察。研究发现,政府债务对经济增长的非线性影响表现为先促进后抑制的倒U型关系,且该临界点位于负债率90%-110%区间之内;同时,一国人口老龄化程度越高以及金融发展水平的过度深化将抑制该国的经济增长。此外,宏观因素(财政基本盈余的改善、实际GDP增长率的上升)与制度因素(政务信息的透明、财政权力的集中)对于政府债务削减都具有显著影响,但通货膨胀率与债务利率的作用则相对较弱。

关键词：政府债务经济增长负债率债务削减

在线全文

学校读者我要写书评

暂无评论

有关电子监管码制作的讨论

数码印刷 2008年第8期 66-67页

作者：徐文革上海火并信息技术有限公司

本文从软件开发商的角度谈谈电子监管码的制作。近期,陆续有新老客户询问有关电子监管码的制作问题,数码印刷设备提供商也询问相关电子监管码的解决方案,另外还看到有专门的电子监管码打印的软件上市。为了监管码的制作,上海火并信息技... 详细信息

本文从软件开发商的角度谈谈电子监管码的制作。近期,陆续有新老客户询问有关电子监管码的制作问题,数码印刷设备提供商也询问相关电子监管码的解决方案,另外还看到有专门的电子监管码打印的软件上市。为了监管码的制作,上海火并信息技术有限公司(以下简称火并)先后推出了3套制作方案。从大家热切关注的情形看,监管码很高深,而事实真的是那样吗?这里可以很明确地告诉大家,电子监管码并不复杂,更谈不上神秘。

关键词：制作方案监管电子软件开发商数码印刷设备信息技术提供商询问

Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The fate of riverine sulfate ion (SO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is significantly modified by *** understand the sulfur cycle in aquatic systems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)S_(SO4)and δ^(18)O_(SO4)) of major rivers around the Badain Jaran Desert,northwestern China,were *** rivers had averaged SO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global *** δ^(34)S_(SO4)and δ^(18)O_(SO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,*** end-member analysis and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate *** isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid *** on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely *** the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier ***,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： Sulfur and oxygen isotopes Source apportionment Inverse model Arid environment Inland rivers Northwestern China

Laboratory evaluation of high-friction thin overlays for pavement preservation

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2024年第6期18卷 936-948页

作者： Ouming xu Rentao xu Lintong JIN School of Highway Chang’an UniversityXi’an 710064China School of Materials Science and Engineering Chang’an UniversityXi’an 710061China

Traditional asphalt concrete(AC)and stone matrix asphalt(SMA),which are used as thin asphalt overlays,are common maintenance strategies to enhancing ride quality,skid resistance,and ***,several studies have used a novel asphalt mixture known as a high-friction thin overlay(HFTO)to improve surface ***,it remains uncertain whether the laboratory properties of HFTO differ significantly from those of conventional *** study aims to evaluate the laboratory properties of HFTO mixtures and compare them with those of AC and *** mixtures with nominal maximum size of 9.5 mm were produced in the laboratory,and performance tests were conducted,including wheel tracking test,low temperature flexural creep test,moisture susceptibility test,Cantabro Abrasion Test,Marshall Test,sand patch test,British pendulum test,and indoor tire-rollingdown *** results showed that the HFTO exhibited a lower tire/pavement noise than the AC and ***,HFTO had superior high-temperature stability,larger macro texture,and higher skid resistance in comparison to those of AC,but lower than those of ***,HFTO mixtures may be considered a suitable replacement for traditional AC mixtures in regions where skid resistance and noise reduction are concerns.

关键词： road engineering pavement maintenance high friction thin overlay performance skid resistance tire/pavement noise

The application of rapid prototyping technique in chin augmentation

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

The application of rapid prototyping technique in chin augme...

Aldehyde oxidase mediated enantioselective metabolic health risk of dinotefuran

美丽人生和谐世界——中华医学会第七次全国医学美学与美容学术年会、中华医学会医学美学与美容学分会20周年庆典暨第三届两岸四地美容医学学术论坛

作者： LI Min xu Yongcheng Liu wenge Shao Zhen Zhang xudong Ge Hong Department of traumatic - aesthetic surgery,HuangSi Aesthetical Surgery Hospital Beijing 100120 China

Object To discuss the application of computer aided design and rapid prototyping techniques assisted prosthetic chin augmentation in rectification of mild *** nine cases of mild microgenia received the electro -beam computer tomography *** we performed three -dimensional reconstruction and operative design with *** to the design,we decided the shape and size of prosthesis and made individual prosthesis model for chin augmentation with rapid prototyping *** With the application of computer aided design and rapid prototyping technique,we could determine the shape,size and embedding location *** prefabricating individual prosthesis model is useful to improve the accuracy of *** the series of nine cases of mild microgenia,three of them received silicone implantation,four of them received ePTFE implantation,and the other two received Medpor *** of them got satisfied *** six to twelve months follow - up,all patients felt *** The application of computer aided design and rapid prototyping techniques can offer surgeon individual pre - operative design and ideal prosthesis *** provides favor- able assistance for prosthetic rectification of mild microgenia.

关键词： Computer aided design Rapid prototyping technique Microgenia Chin augmentation

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

Science China Chemistry 2024年第6期67卷 2079-2091页

作者： Liwei xu Xinxin xu Hua Kuang Chuanlai xu Xiaoling Wu State Key Laboratory of Food Science and Resources Jiangnan UniversityWuxi214122China International Joint Research Laboratory for Biointerface and Biodetection and School of Food Science and Technology Jiangnan UniversityWuxi214122China Collaborative Innovation center of Food Safety and Quality Control in Jiangsu Province Jiangnan UniversityWuxi214122China

Chiral pollutants often pose significant differential environmental health *** this study,the biotransformation of chiral dinotefuran(DIN)and its enantioselective metabolic toxicity mechanisms have been systemically ***,reversedphase chromatography-high resolution mass spectrometry was developed to quantify the content of DIN R/S chiral enantiomer with pg level sensitivity,revealing a lower elimination rate constant(K_(e))of S-DIN(0.730 h^(-1))than R-DIN(0.746 h^(-1)).Secondly,the interaction mechanism between DIN metabolism and important endogenous bioactive molecules,such as aldehyde oxidase(AOX)and neurotransmitters,was *** DIN nitro-group was converted into a guanidine group by the reducing site of nearby flavin adenine dinucleotide(FAD)in AOX with the preferred higher affinity of ***,the endogenous tryptophan(Trp)aldehyde metabolic intermediate,5-hydroxyindoleacetaldehyde(5-HIAL),provides a persistent electron donor for DIN reduction via the oxidation-catalyzed site in AOX,resulting in remarkable up-regulation of monoamine neurotransmitters such as serotonin and ***,the higher level of neurotransmitters further mediated dysregulation of oxylipin homeostasis via the serotonergic pathway,where S-DIN exhibited more pronounced liver lipid damage and environmental health risk with the accumulated lipid biomarkers,oxidized triglyceride(OxTG)and oxidized sphingomyelin(OxSM).This study elucidates the AOX-mediated enantioselectivity metabolic pathway of DIN,providing a new analytical method for chiral pollutants and paves the way for their health risk assessments.

关键词： neonicotinoid dinotefuran enantiomer aldehyde oxidase metabolomics health risk