检索结果-南通市图书馆

西南石油学院学报 2005年第4期27卷 75-77页

作者：赵卫军薛建勤胡国松黄平辉西南石油学院四川成都610500 青海油田分公司勘探开发研究院

近年来,中国石油需求的数量不断猛增,而石油产量增长缓慢,据预测中国石油进口将进一步扩大;通过新工艺、新技术的应用和产业结构的优化,提出了资源节约的可能性;并结合国内外的石油开采、控制及供给形势,分析和评价了中国石油安全性。

关键词：石油安全采出程度产业结构石油储备

Multispectral ErBO_(3)@ATO porous composite microspheres with laser and electromagnetic wave compatible absorption

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第7期42卷 2406-2418页

作者： song-song guo jian-Ping Zhu Zhi song Qing-guo Ren Tong Feng Qi-Tu Zhang Li-Xi Wang College of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing211816China

The high-speed advances in electromagnetic(EM)wave and laser detection technology have accelerated the innovation of absorbing materials toward specific multi-band *** is difficult to achieve dual absorption of EM waves and near-infrared lasers by absorbing materials in a single frequency band;the design of high-performance laser-EM wave multi-band compatible absorbing materials is ***,ErBO_(3)@ATO(erbium borate/antimony-doped tin oxide)porous composite microspheres with an average size of 15-20μm are produced solvothermal method and self-assembly,which exhibit excellent laser-EM wave compatible *** porous structure on the surface of ErBO_(3)microspheres provides heterogeneous nucleation sites for ATO particle *** minimum reflectivity of the composite for1.06 and 1.54μm lasers is 9.59%and 4.79%,which is0.57%and 3.78%lower than those of pure ATO particles,*** composites containing 70 wt%porous ErBO_(3)@ATO reveal the minimum reflection loss(RL)value of-31.6 dB,and an effective absorption band width reaches 2.08 GHz at 2.5 mm *** mechanism of near-infrared laser and EM wave compatible absorption is the synergistic effect of the energy level transition of ErBO_(3)and the dielectric loss of ATO,coupled with the large surface area and porous structure of the micro ***,the designed porous ErBO_(3)@ATO composite microspheres can be an attractive choice for lasers and EM wave high-quality compatible absorption.

关键词： Core-shell ErBO_(3)@antinomy-doped tin oxide(ATO) Porous microsphere Laser reflection Electromagnetic(EM)wave loss

VEGF165基因修饰脂肪干细胞对糖尿病大鼠骨缺损的修复研究

在线全文

学校读者我要写书评

暂无评论

中国骨伤 2017年第6期30卷 545-551页

作者：王洪君蔡波赵星宇李叔强冯卫刘建国李冬松敦化市医院骨科吉林敦化133700 解放军208医院特诊科吉林长春130062 吉林大学第一医院骨关节外科吉林长春130021

目的 :探讨采用基因转染大鼠脂肪干细胞构建血管化组织工程的方法对糖尿病骨质疏松性骨缺损的修复效果。方法:选取雄性Wistar大鼠78只,体重180~220 g,其中72只通过化学药物(STZ)诱导法建立糖尿病动物模型,成模大鼠血糖值均≥16.7 mmol/... 详细信息

目的 :探讨采用基因转染大鼠脂肪干细胞构建血管化组织工程的方法对糖尿病骨质疏松性骨缺损的修复效果。方法:选取雄性Wistar大鼠78只,体重180~220 g,其中72只通过化学药物(STZ)诱导法建立糖尿病动物模型,成模大鼠血糖值均≥16.7 mmol/L。将实验动物随机分为5组,正常对照组6只,其他实验组各18只。正常对照组:在正常大鼠骨缺损内植入经VEGF165基因修饰的脂肪干细胞;糖尿病组:单纯糖尿病骨缺损大鼠;生长因子组:在糖尿病大鼠骨缺损内单纯植入VEGF生长因子;干细胞组:在糖尿病大鼠骨缺损内单纯植入脂肪干细胞;实验组:在糖尿病大鼠骨缺损内植入经VEGF165基因修饰的脂肪干细胞。将5×106个VEGF165-ADSCs细胞与凝胶海绵结合后,植入到糖尿病大鼠骨缺损模型中,在植入后第4周时,采用光学显微镜观察缺损修复组织大体形态;采用免疫组化SP法测定骨缺损区修复后局部微血管密度;应用美国IRIS IntrepidⅡXSP电感耦合等离子体发射光谱仪对修复骨痂内钙/磷含量和碱性磷酸酶(ALP)含量测定;统计分析上述测量结果验证VEGF165-ADSCs对糖尿病大鼠骨缺损的修复作用。结果:荧光染色结果显示,VEGF165表达定位于ADSCs的细胞浆,表达率在87﹪以上;大体组织学观察结果显示:实验组修复区内骨痂生成范围和质量接近正常组,糖尿病组、生长因子组、干细胞组修复效果欠佳。植入后第4周,实验组单位体积的修复组织钙、磷含量和ALP含量明显高于生长因子组、干细胞组(P0.05);第4周时,实验组修复局部的血管密度低于正常对照组(P<0.05),而显著高于其他组(P<0.05)。结论 :VEGF165基因修饰的脂肪干细胞在糖尿病大鼠体内具有良好的成骨及成血管作用,有望成为修复糖尿病特定骨质条件下骨缺损的一种有效手段。

关键词：糖尿病动物,基因修饰干细胞大鼠

DAO媒介:驱动未来社会算法化与自组织的元媒介

在线全文

学校读者我要写书评

暂无评论

新疆师范大学学报（哲学社会科学版） 2025年第1期46卷 132-141页

作者：喻国明苏健威北京师范大学新闻传播学院北京师范大学传播创新与未来媒体实验平台北京100875

DAO媒介是以区块链算法等技术为基础,支持数字社群协同自治的媒介,具有区块链、智能合约与投票等功能特性和要素确权、技术信任、规则构架以及场景聚合等价值禀赋。对于数字生态显露的各种问题,“算法化”是重构数字生态、降解社会系统... 详细信息

DAO媒介是以区块链算法等技术为基础,支持数字社群协同自治的媒介,具有区块链、智能合约与投票等功能特性和要素确权、技术信任、规则构架以及场景聚合等价值禀赋。对于数字生态显露的各种问题,“算法化”是重构数字生态、降解社会系统复杂性的关键机制,DAO媒介是支撑“自组织式”算法化的元媒介。DAO媒介与数字文明时代喷发的微粒个体、微资源、微价值、微需求、微场景等相匹配,能够深度匹配人的个性与自我,形成有效的趣缘连接,进而极大地释放数字文明的生产力。DAO媒介将深刻影响社会系统的构造,将微粒个体与相关社会要素“包裹”为闭环子系统,支持其准开放的系统边界、有效的异质性整合、可持续的规则重构、子系统与父级系统的持续分化和快速进化,等等。在数字文明时代,DAO媒介将使“重新部落化”的“地球村”变为现实,其驱动构筑的DAO社会将更加多元、更加富有创造力,不断拓展人类群体实践的自由度,使人类在高度异质性聚合基础上更加和谐有序地整合协同。

关键词： DAO 数字媒介算法自组织社会系统

Influence of Rust Layers on the Corrosion Behavior of Ultra-High Strength Steel 300M Subjected to Wet–Dry cyclic Environment with Chloride and Low Humidity

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 139-146页

作者： Qiang guo jian-Hua Liu Mei Yu song-Mei Li Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and Engineering Beihang University

The influence of rust layers on the corrosion behavior of ultra-high strength steel 300M subjected to a simulated coastal atmosphere was investigated by corrosion weight loss, surface analysis techniques, and electrochemical methods. The results exhibit the presence of a large proportion of γ-FeOOH and α-FeOOH and a small amount of Fe3O4 in the outer rust layer. During the wet-dry cyclic process, the bonding performance and the density of outer rust layer deteriorate with the thickness of outer rust. The inner rust layer plays a main role on protectiveness, which can be attributed to the formation of an ultra-dense and adherent rust film with major constituent of α-FeOOH and α-Fe2O3 on the steel.

关键词： Ultra-high strength steel Wet-dry Chloride Corrosion Rust

Facile Preparation of Electromagnetic Interference Shielding Materials Enabled by Constructing Interconnected Network of Multi-walled Carbon Nanotubes in a Miscible Polymeric Blend

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第6期38卷 593-598页

作者： Qi-Yan Zhang Han-song Li Bao-Hua guo Zhao-Xia guo jian Yu Key Laboratory of Advanced Materials(Ministry of Education) Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Electromagnetic interference(EMI)shielding materials are in great demand in electronic equipment and our surrounding environment to resist the increasing serious radiation *** with their metal counterparts,conductive polymer composites(CPCs)have unique advantages of lightweight,corrosive resistance,low cost,and excellent processability,and are therefore an ideal choice for developing high-performance EMI shielding ***,CPCs based EMI shielding materials are limited to high filler loading,which caused poor mechanical properties and ***,we demonstrate a facile and highly scalable approach to develop high-performance EMI shielding materials with low filler loading by using miscible poly(phenylene oxide)/polystyrene(PPO/PS)blend as the *** contrast to PS/carbon nanotubes(CNTs)composites,PPO/PS/CNTs composites show much higher EMI shielding effectiveness caused by good dispersion of CNTs and highly interconnected conductive *** excellent EMI shieling effectiveness of 23-25 dB is achieved for PPO/PS/10%CNTs composites with a thickness of only 375 pm;which is superior to most of reported polymer/CNTs composites prepared by *** addition,the results show that although absorption is the major shielding mechanism,the contribution of reflection is also important and closely related to the connectivity of conductive network,as well as the electrical conductivity of the CPCs.

关键词： Conductive polymer composites Polymer blend Electromagnetic interference shielding Conductive network Dispersion

微波消解电感耦合等离子体原子发射光谱法测定煤中砷和磷

在线全文

学校读者我要写书评

暂无评论

煤质技术 2017年第2期32卷 18-20,31页

作者：薛妍张庆建闵国华宋飞丁仕兵管嵩山东出入境检验检疫局检验检疫技术中心山东青岛266500

利用硝酸和过氧化氢的混合体系于高压密闭微波消解仪中消解试样,采用电感耦合等离子体原子发射光谱法同时测定煤中的砷和磷。微波消解电感耦合等离子体原子发射光谱法的砷检出限为0.005 4μg/g、磷检出限为0.000 34%。该方法操作简便、... 详细信息

利用硝酸和过氧化氢的混合体系于高压密闭微波消解仪中消解试样,采用电感耦合等离子体原子发射光谱法同时测定煤中的砷和磷。微波消解电感耦合等离子体原子发射光谱法的砷检出限为0.005 4μg/g、磷检出限为0.000 34%。该方法操作简便、快速,通过测定标准物质,其检测值和标准值基本一致,测试相对标准偏差小于5%,可满足煤中砷和磷的准确测定。

关键词：微波消解电感耦合等离子体原子发射光谱法砷磷检出限相对标准偏差

A Construction of Cryptogroups

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第5期23卷 789-798页

作者： Guang Tian song guo Xin LIU jian Gang ZHANG Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China Department of Mathematics Southwest University Chongqing 400715 P. R. China

In this paper, a cryptogroup is constructed by a band and a family of groups and homomorphisms satisfying some conditions.

关键词： Cryptogroup Band Group homomorphism

Insight into characteristics and sources of PM2.5 in the Beijing–Tianjin–Hebei region, China

在线全文

学校读者我要写书评

暂无评论

National Science Review 2015年第3期2卷 257-258页

作者： Min Hu song guo jian-fei Peng Zhi-jun Wu College of Environmental Sciences and Engineering Peking University Departments of Atmospheric Sciences and Chemistry Texas A&M University

As the world’s second-largest economy,China has experienced severe air pollution with unprecedentedly high levels of PM2.5,*** mater smaller than 2.5μm in *** Ministry of Environmental Protection of China released an air pollution monitoring report for the year 2013 for the 74 largest cities of *** Beijing–Tianjin–Hebei(BTH)region was classiied as having the poorest air *** annual

关键词： Insight into characteristics and sources of PM Hebei region China Tianjin

Study on the subgrade deformation under high-speed train loading and water–soil interaction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2016年第2期32卷 233-243页

作者： jian Han guo-Tang Zhao Xiao-Zhen Sheng Xue-song Jin State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China China Railway Corporation Beijing 100844 China

It is important to study the subgrade characteristics of high-speed railways in consideration of the water–soil coupling dynamic problem,especially when high-speed trains operate in rainy *** study develops a nonlinear water–soil interaction dynamic model of slab track coupling with subgrade under high-speed train loading based on vehicle–track coupling *** using this model,the basic dynamic characteristics,including water–soil interaction and without water induced by the high-speed train loading,are *** main factors-the permeability coefficien and the porosity-influencin the subgrade deformation are *** developed model can characterize the soil dynamic behaviour more realistically,especially when considering the influenc of water-rich soil.

关键词： Water–soil interaction High-speed train loading Finite difference method Subgrade deformation Permeability coefficien Porosity