检索结果-南通市图书馆

Oil production rate predictions for steam assisted gravity drainage based on high-pressure experiments

Science China(Technological Sciences) 2013年第2期56卷 324-334页

作者： GUO Jia ZAN Cheng MA DeSheng shi lin State Key Laboratory of Enhanced Oil Recovery Research Institute of Petroleum Exploration and DevelopmentPetro China Key Laboratory of Thermal Science and Power Engineering of Ministry of Education Department of Thermal EngineeringTsinghua University State Key Laboratory of Enhanced Oil Recovery Research Institute of Petroleum Exploration and DevelopmentPetroChina

Dual-well steam assisted gravity drainage(SAGD) has significant potential for extra-heavy oil *** is conducting two dual-well SAGD pilot projects in the Fengcheng extra-heavy oil ***,direct predictions of the oil production rate by algebraic models rather than complex numerical models are of great importance for designing and adjusting the SAGD operations.A low-pressure scaled physical simulation was previously used to develop two separate theoretical models corresponding to the two different growth stages observed in the SAGD steam chambers,which are the steam chamber rising stage and the steam chamber spreading stage.A high-pressure scaled model experiment is presented here for one dual-well SAGD pattern to further improve the prediction models to reasonably predict oil production rates for full *** that significantly affect the oil recovery during SAGD were scaled for the model size based on the reservoir characteristics of the Fengcheng reservoir in *** results show the relationship between the evolution of the steam chamber and the oil production rate during the entire production ***-pressure scaled model test was used to improve the gravity drainage models by modifying empirical factors for the rising model and the depletion model.A new division of the SAGD production regime was developed based on the relationship between the oil production rate and the evolution of steam chamber.A method was developed to couple the rising and depletion models to predict oil production rates during the SAGD production,especially during the transition *** method was validated with experiment data and field data from the *** model was then used to predict the oil production rate in the Fengcheng reservoir in China and the Athabasca reservoir in Canada.

关键词：蒸汽辅助重力泄油预测模型高压实验基础缩尺模型试验 SAGD 代数模型满负荷生产

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

Theoretical analysis of the surface temperature regulation of an infrared false target subjected to periodical ambient conditions

引用

Defence Technology（防务技术） 2016年第5期12卷 360-366页

作者： shi-min LI Hong YE Qi-zhao lin Department of Thermal Science and Energy Engineering University of Science and Technology of China

Infrared false target is an important mean to induce the infrared-guided weapons,and the key issue is how to keep the surface temperature of the infrared false target to be the same as that of the object to be ***-dimensional heat transfer models of a metal plate and imitative material were established to explore the influences of the thermophysical properties of imitative material on the surface temperature difference（STD） between the metal plate and imitative material which were subjected to periodical ambient *** is elucidated that the STD is determined by the imitative material’s dimensionless thickness（dim*,） and the thermal inertia(Pim).When dim* is above 1.0,the STD is invariable as long as Pim is a *** if the dimensionless thickness of metal plate（d,m*） is also larger than 1.0,the STD approaches to zero as long as Pimis the same as the thermal inertia of metal plate（Pm）.When dim* is between 0.08 and 1,the STD varies irregularly with Pim and dim*.However,if dm* is also in the range of 0.08-1,the STD approaches to zero on condition that Pim=Pm and dim*= dm*.If dim*,is below 0.08,the STD is unchanged when Pimdim* is a *** if dm* is also less than 0.08,the STD approaches to zero as long as Pimdim* = Pmdm*.Furthermore,an applicationoriented discussion indicates that the imitative material can be both light and thin via the application of the phase change material with a preset STD because of its high specific heat capacity during the phase transition process.

关键词： Infrared false target Surface temperature Periodical ambient conditions Thermal inertia Dimensionless thickness

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

Extracellular vesicles derived from neural EGFL-Like 1-modified mesenchymal stem cells improve acellular bone regeneration via the miR-25-5p-SMAD2 signaling axis

引用

Bioactive Materials 2022年第11期7卷 457-470页

作者： Yanhua Lan Huizhi Xie Qianrui jin Xiaomin Zhao Yang shi Yanyan Zhou Zihe Hu Yi Ye Xiaoyuan Huang Yingjia Sun Zhuo Chen Zhijian Xie Stomatology Hospital School of StomatologyZhejiang University School of MedicineClinical Research Center for Oral Diseases of Zhejiang ProvinceKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Center of Zhejiang UniversityHangzhou310006China Department of Orthopaedics and Traumatology Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong Kong999077China

Stem cell based transplants effectively regenerate tissues;however, limitations such as immune rejection and teratoma formation prevent their application. Extracellular vesicles (EVs)-mediated acellular tissue regeneration is a promising alternative to stem cell based transplants. Although neural EGFL-like 1 (Nell1) is known to contribute to the osteogenic differentiation of bone marrow stem cells (BMSCs), it remains unknown whether EVs are involved in this process. Here, we present that EVs derived from Nell1-modified BMSCs (Nell1/EVs) have a stronger ability to promote BMSC osteogenesis owing to miR-25–5p downregulation. MiR-25–5p inhibits osteogenesis by targeting Smad2 and suppressing the SMAD and extracellular signal-related kinase 1 and 2 (ERK1/2) pathway activation. In addition, we demonstrate that the 3D-Nell1/EV-hydrogel system is beneficial for bone regeneration in vivo, probably stemming from a slow, continuous release and high concentration of EVs in the bone defect area. Thus, our results have shown the potential of Nell1/EVs as a novel acellular bone regeneration strategy. Mechanistically, the identification of miR-25-5p-SMAD2 signaling axis expands the knowledge of Nell1/EVs induced osteogenesis.

关键词： Extracellular vesicles Mesenchymal stem cells Bone regeneration Cell-free scaffolds miRNAs

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

Swelling Process of Thin Polymer Film Studied via in situ Spectroscopic Ellipsometry

引用

Chemical Research in Chinese Universities 2017年第5期33卷 833-838页

作者： XU lin ZOU Zhiming ZHANG Huanhuan shi Tongfei Laboratory of Surface Physics and Chemistry Guizhou Education University Guiyang 550018 P. R. China Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials College of Chemistry and Bioengineering Guilin University of Technology Guilin 541004 P. R. China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China

The swelling process of thin polystyrene films in quantity was studied in this paper using the in situ spec- troscopic ellipsometry. We systematically investigated the influence of film thickness on the swelling process of thin polystyrene films. The results show that in the case of high Mw polystyrene（Mw=400000）, the curve of the swelling degree as a function of time discloses that the relaxation of the long polymer chains accompanies the diffusion of acetone molecules, The swelling process is via the Fickian relaxation mechanism. Both the values of the equilibrium swelling degree and the diffusion coefficient of acetone molecules in the polystyrene film decrease as the film thick- ness reduces under confinement. However, in the case of lowMw PS（Mw=4100）, the dewetting process is so fast be- fore the equilibrium of swelling that the whole swelling process cannot be observed.

关键词： Thin polymer film Solvent swelling Dewetting

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

An on-chip intestine-liver model for multiple drugs absorption and metabolism behavior simulation

引用

Science China Chemistry 2018年第2期61卷 236-242页

作者： Mingsha Jie Haifeng lin Ziyi He Hanyang Liu Haifang Li jin-Ming lin State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Department of Chemistry Beijing Key Laboratory of Microanalytical Methods and Instrumentation Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology Ministry of Education Tsinghua University

A double-layer microfluidic chip integrated with a hollow fiber(HF)was developed to reconstitute the intestine-liver functionality for studying the absorption and metabolism of combination ***-2 cells were inoculated in the HF cavity at the top of the serpentine channel to simulate the intestinal tissue for drug absorption and transport studied,and Hep G2 cells,seeded in the bottom chamber,were used to mimic the liver for metabolism-related *** and dacarbazine were selected for combination drug therapy and its effects on cell viability,hepatotoxicity,and cell cycle arrest under drug-conditioned culture were *** results suggested that the combined concentration below-100μg/m L had no significant inhibitory effect on Hep G2 cell viability,and therefore Hep G2 cells maintained their drug metabolism *** the drug concentration was increased above 250μg/m L,Hep G2 cells underwent *** of metabolites by mass spectrometry proved the effective metabolism in the microchip *** dynamic,co-culture microchip successfully provided a podium for long-term observation of absorption,transport,and metabolism of combination drugs,and could be an effective in vitro simulation model for further clinical research.

关键词：新陈代谢肝功能行为模拟吸收薄片模型肠多重

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

Spin effects on the relativistic strong EM wave modes in magnetized plasma

引用

Communications in Theoretical Physics 2023年第6期75卷 120-126页

作者： Qiang-lin Hu Wen Hu jin-Peng Xiao Department of Physics and Electronics Engineering Tongren UniversityTongRen 554300China Department of Physics Jinggangshan UniversityJi’an 343009China

Based on the relativistic hydrodynamic model of EM wave-spin plasmas interaction,the spin effects on the relativistic strong EM modes in magnetized plasma are *** dispersion relations of the EM wave propagating parallel and perpendicular to the external magnetic field are *** show that the strong EM wave modes are affected by the time component of four-spin as well as the increase of electron effective *** in the case of EM wave propagating parallel to the external magnetic field,the time component of fourspin amplifies the influence of spin effects on the low-frequency modes obviously.

关键词： intense electromagnetic wave spin effect relativistic effect dispersion relation

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

Effect of the Uneven Circumferential Blade Space on the Performance of Small Axial Flow Fan

引用

Journal of Thermal Science 2016年第6期25卷 492-500页

作者： LIU Yang lin Zhe lin Peifeng jin Yingzi Toshiaki Setoguchi Heuy Dong Kim Key Laboratory of Fluid Transmission Technology of Zhcjiang Province Zhejiang Sci-Tech UniversityHangzhou310018China Department of Mechanical Engineering Saga UniversityHonjo-machiSaga840-8502Japan School of Mechanical Engineering Andong National UniversitySeongcheon-Dong1375Gyeongdong-RDAndongGyeongsangnuk-DO760-749Korea

Effects of the uneven circumferential blade space on static characteristics and aerodynamic noise of a small axial flow fan are studied in this *** blade angle modulation is adopted to design a series of unequally spaced fans,which have different maximum of modulation angular *** steady flow is simulated by the calculations of Navier-Stokes equations coupled with RNG k-epsilon turbulence model,while the unsteady flow is computed with large eddy *** to theoretical analysis,a fan with a maximum of modulation angular displacement of 6° is regarded as the optimal unequally spaced *** experiment of static characteristic is carried out in a standard wind tunnel and the aerodynamic noise of both fans is tested in a semi-anechoic ***,performances of the optimal unequally spaced fan are compared with those of the prototype *** results show that there is reasonable agreement between the simulation results and the experimental *** is found that the discrete noise of the optimal unequally spaced fan is lower than that of the prototype fan at the near field monitoring *** can be explained that the total pressure fluctuation of the optimal unequally spaced fan is much more regular than that of the prototype fan.

关键词：小轴的流动扇子不平的环绕的片空间静态的特征分离噪音宽带噪音

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

餐厨易腐有机垃圾中油脂降解菌的筛选和产酶条件优化

引用

环境工程 2024年第6期42卷 103-110页

作者：龙腾发林清钰张忠兰孙雨暄金尧霍强陈春强广西师范大学环境与资源学院广西桂林541004 珍稀濒危动植物生态与环境保护省部共建重点实验室广西桂林541004

近年来,我国餐厨易腐有机垃圾产生量逐年上升,为提高其降解速率,亟须开发高效降解餐厨易腐有机垃圾的工艺。筛选了能够适应餐厨易腐有机垃圾且能高效降解油脂能力的菌株,以期实现餐厨易腐有机垃圾快速降解和资源化。从餐厨易腐有机垃圾... 详细信息

近年来,我国餐厨易腐有机垃圾产生量逐年上升,为提高其降解速率,亟须开发高效降解餐厨易腐有机垃圾的工艺。筛选了能够适应餐厨易腐有机垃圾且能高效降解油脂能力的菌株,以期实现餐厨易腐有机垃圾快速降解和资源化。从餐厨易腐有机垃圾及部分被油污染的土壤中采集样品,采用16S rDNA测序技术并构建菌株发育树,利用响应面分析方法研究菌株最适生长条件。通过筛选及功能验证,获得1株高效降解油脂菌株TH1,初步鉴定为粘质沙布雷氏菌(Serratia marcescens)。单因素实验和响应面方法表明,该菌株在温度30℃、pH=7.54、盐度1%的条件下,脂肪酶活力高达213.70 U/L。该研究可为后续开发复合菌剂进行餐厨易腐有机垃圾高效降解、机理研究及资源化利用提供种质资源。

关键词：油脂降解餐厨易腐有机垃圾酶活力响应面优化

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

Lithium-plasmon-based low-powered dynamic color display

引用

National Science Review 2023年第1期10卷 205-213页

作者： Jie Liang Yan jin Huiling Yu Xinjie Chen lin Zhou Pengcheng Huo Ye Zhang Haiyang Ma Yi Jiang Bin Zhu Ting Xu Hui Liu shining Zhu Jia Zhu National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesSchool of Physics Key Laboratory of Intelligent Optical Sensing and ManipulationMinistry of EducationJiangsu Key Laboratory of Artificial Functional MaterialsNanjing University

Display and power supply have been two essential and independent cornerstones of modern ***,we report a lithium-plasmon-based low-powered dynamic color display with intrinsic dual functionality（plasmonic display and energy recycling unit） which is a result of the electric-field-driven transformation of nanostructured lithium *** color displays are enabled by plasmonic transformation through electrodeposition（electrostripping） of lithium metals during the charging（discharging） process,while the consumed energy for coloring can be retrieved in the inverse process *** recycling of lithium metals brings energy consumption down to 0.390 mW cm-2(0.105 mW cm-2) for the active（static） coloration state of a pro of-of-concept display/battery device,which approaches nearly-zero-energy-consumption in the near-100%-energy-efficiency limit of commercial lithium *** the subwavelength feature of plasmonics with effective energy recycling,the lithium-plasmon-based dynamic display offers a promising route towards next-generation integrated photonic devices,with the intriguing advantages of low energy consumption,a small footprint and high resolution.

关键词： lithium plasmon dynamic display lithium metal battery low energy consumption lithium nanoparticle

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

黄芪多糖对黄喉拟水龟生长性能、血清生化指标及肠道菌群结构的影响

引用

南方农业学报 2024年第2期55卷 388-396页

作者：吴志刚张洪耀高铭佐严子科谭雯予韩书煜施金谷黄德生梁静真黄钧广西大学动物科学技术学院/广西水生动物病害诊断实验室/广西高校水生生物健康养殖与营养调控重点实验室广西南宁530004 广西水产技术推广站广西南宁530022 合浦县水产技术推广站广西北海536199

【目的】探究饲料中添加不同水平的黄芪多糖对黄喉拟水龟(Mauremys mutica)生长性能、血清生化指标和肠道菌群结构的影响,以期为黄芪多糖在黄喉拟水龟饲料中的应用及黄喉拟水龟的健康养殖提供理论依据。【方法】将初始平均体重为128.36... 详细信息

【目的】探究饲料中添加不同水平的黄芪多糖对黄喉拟水龟(Mauremys mutica)生长性能、血清生化指标和肠道菌群结构的影响,以期为黄芪多糖在黄喉拟水龟饲料中的应用及黄喉拟水龟的健康养殖提供理论依据。【方法】将初始平均体重为128.36±1.80g的黄喉拟水龟随机分为5组,分别投喂黄芪多糖含量为0(M0,对照组)、0.25%(M25)、0.50%(M50)、0.75%(M75)和1.00%(M100)的等氮等脂饲料,每组设3个重复,每重复10只龟,投喂60 d后测定其生长性能指标和血清生化指标,以高通量测序分析肠道菌群结构。【结果】生长性能分析结果显示,M25、M50和M75组的黄喉拟水龟的增重率和特定生长率显著高于M0组(P0.05,下同)。血清生化指标检测结果显示,M25、M50和M75组的碱性磷酸酶和超氧化物歧化酶活性显著高于M0组,M50、M75和M100组的过氧化氢酶活性显著高于M0组;M25、M50和M75组的丙二醛含量显著降低。肠道菌群分析结果显示,M25组群落丰富度指数(Sobs指数和ACE指数)显著高于M0组,群落多样性指数(Shannon指数和Simpson指数)与M0组无显著差异。M50、M75和M100组的Sobs指数、Chao1指数、ACE指数、Shannon指数和Simpson指数与M0组差异均不显著。在门分类水平上,各组丰度占比排名前3的菌群均为厚壁菌门、拟杆菌门和变形菌门,0.25%~1.00%的黄芪多糖对门分类水平的肠道菌群组成无显著影响。在属分类水平上,M50组的瘤胃球菌属1和M75组的汉氏盐单胞菌属相对丰度显著提高;添加0.25%和1.00%的黄芪多糖对属分类水平的肠道菌群组成均无显著影响。【结论】饲料中添加适量的黄芪多糖能有效地促进黄喉拟水龟生长、提高抗氧化能力并改善肠道菌群结构。综合分析,建议饲料中黄芪多糖添加量为0.50%。

关键词：黄芪多糖黄喉拟水龟生长性能血清生化指标肠道菌群结构

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

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：