检索结果-南通市图书馆

Hydrocarbon generation from lacustrine shales with retained oil during thermal maturation

Petroleum Science 2020年第6期17卷 1478-1490页

作者： xin-he shao Xiong-Qi Pang Mao-Wen Li Zhi-Ming Li Yi Zhao State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China College of Geosciences China University of PetroleumBeijing 102249China State Key Laboratory of Shale Oil and Shale Gas Resources and Eff ective Development SINOPEC Petroleum Exploration and Production Research InstituteBeijing 100083China SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms Wuxi Institute of Petroleum GeologyWuxi 214126JiangsuChina

Thermal maturation in the shale oil/gas system is inherently complex due to the competitive interplays between hydrocarbon generation and retention *** study hydrocarbon generation characteristics from shales within different stages of thermal maturation under the influence of retained oil,we performed Micro-Scale Sealed Vessels(MSSV)pyrolysis on a set of artificially matured lacustrine shale s amples from the Shahejie Formation in the Dongpu Depression in Bohai B ay Basin,*** results show that hydrocarbon yields of shale samples with or without retained oil at various thermal maturities follow different evolution *** components(C15+)in samples crack at high temperatures and generally follow a sequence,where they first transform into C6-14 then to C2-5 and *** accounts for most of the gaseous products at high temperatures in all samples,with different *** cracking of C2-5 is the main methane-generating process in samples with retained oil,whereas the source of methane in samples without retained oil is *** the studied shales,retained oils at early-mature stage retard the transformation of liquid to gaseous hydrocarbon and prompt the cracking of C2-5 to C1 to some *** reaction related to gypsum in the studied samples is the primary reason that can explain the loss of hydrocarbon yields,especially at high *** addition,transformation of volatile hydrocarbons to gas and coke also accounts for the loss of generated hydrocarbon,as a secondary factor.

关键词： MSSV pyrolysis Hydrocarbon generation Lacustrine shales Thermal maturation Retained oil

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

Vacuum chamber suppression of gas-explosion propagation in a tunnel

引用

Journal of China University of Mining and Technology 2008年第3期18卷 337-341页

作者： JIANG Shu-guang WU Zheng-yan LI Qing-hua he xin-jian shao Hao QIN Jun-hui WANG Lan-yun HU Li-ming LIN Bai-quan School of Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

To control and reduce the harm of a gas explosion, a new method is proposed for suppressing gas-explosion propagation in a tunnel by using a vacuum chamber. We studied the suppression effect on gas explosions by placing a vacuum chamber at dif-ferent positions along the tunnel. The results indicate that: 1) the vacuum chamber can absorb the explosion wave and explosion energy as much as possible at the beginning of the gas explosion, and; 2) when the vacuum chamber is used the closer it is to the ignition source the more significant the suppression effect. In addition, by using the vacuum chamber: 1) the flame propagation velocity decreases from ultrasonic to subsonic; 2) the flame propagation distance is remarkably shortened; 3) the maximum peak value of overpressure (pm) decreases from 0.34 to 0.17 MPa or less, and; 4) the impulse of the blast wave (I) decreases from 20 to 8 kPa·s or less.

关键词： vacuum chamber liquid venting flame quenching pressure venting impulse explosion suppression

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

Single-cell omics: experimental workflow, data analyses and applications

引用

Science China Life Sciences 2025年第1期68卷 5-102页

作者： Fengying Sun Haoyan Li Dongqing Sun Shaliu Fu Lei Gu xin shao Qinqin Wang xin Dong Bin Duan Feiyang xing Jun Wu Minmin Xiao Fangqing Zhao Jing-Dong J.Han Qi Liu Xiaohui Fan Chen Li Chenfei Wang Tieliu Shi Department of Clinical Laboratory the Affiliated Wuhu Hospital of East China Normal University (The Second People's Hospital of Wuhu City) Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang University Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration (Tongji University) Ministry of EducationOrthopaedic DepartmentTongji HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji University Frontier Science Center for Stem Cells School of Life Sciences and TechnologyTongji University Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine Shanghai East HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji University Research Institute of Intelligent Computing Zhejiang Lab Shanghai Research Institute for Intelligent Autonomous Systems Center for Single-cell Omics School of Public HealthShanghai Jiao Tong University School of Medicine National Key Laboratory of Chinese Medicine Modernization Innovation Center of Yangtze River DeltaZhejiang University Center for Bioinformatics and Computational Biology Shanghai Key Laboratory of Regulatory Biologythe Institute of Biomedical Sciences and School of Life SciencesEast China Normal University Beijing Institutes of Life Science Chinese Academy of Sciences Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary StudiesCenter for Quantitative Biology (CQB)Peking University Zhejiang Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases Women's HospitalZhejiang University School of Medicine Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal University

Cells are the fundamental units of biological systems and exhibit unique development trajectories and molecular features. Our exploration of how the genomes orchestrate the formation and maintenance of each cell, and control the cellular phenotypes of various organismsis, is both captivating and intricate. Since the inception of the first single-cell RNA technology, technologies related to single-cell sequencing have experienced rapid advancements in recent years. These technologies have expanded horizontally to include single-cell genome, epigenome,proteome, and metabolome, while vertically, they have progressed to integrate multiple omics data and incorporate additional information such as spatial sc RNA-seq and CRISPR screening. Single-cell omics represent a groundbreaking advancement in the biomedical field,offering profound insights into the understanding of complex diseases, including cancers. here, we comprehensively summarize recent advances in single-cell omics technologies, with a specific focus on the methodology section. This overview aims to guide researchers in selecting appropriate methods for single-cell sequencing and related data analysis.

关键词： single-cell sequencing genome epigenome proteomics metabolomics multimodal spatial transcriptomics CRISPR screening

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

基于H_∞-交叉耦合算法的双驱同步控制

引用

浙江大学学报（工学版） 2017年第1期51卷 131-137页

作者：陈海森张德新王继河邵晓巍陈国忠上海交通大学航空航天学院上海200240 上海卫星工程研究所上海200240

针对大型双驱龙门机床中由于大质量滑块运动导致的参数不确定性和时变干扰,为了实现高精度同步控制,提出H_∞-交叉耦合同步控制算法.基于拉格朗日方程,建立能够反映大质量滑块运动的双驱龙门机床动力学模型.与现有的建模方法相比,动力... 详细信息

针对大型双驱龙门机床中由于大质量滑块运动导致的参数不确定性和时变干扰,为了实现高精度同步控制,提出H_∞-交叉耦合同步控制算法.基于拉格朗日方程,建立能够反映大质量滑块运动的双驱龙门机床动力学模型.与现有的建模方法相比,动力学模型中的摩擦力模型能够反映大型龙门机床双驱间的机械耦合关系和大质量滑块的运动,可以更有效地描述具有大质量滑块的龙门机床双驱间的动力学特性.针对该动力学模型,通过基于混合灵敏度问题的设计方法,设计H_∞鲁棒控制器,抑制参数不确定性和时变干扰,并设计交叉耦合控制器,减小机床双驱间的同步误差.在某大型双驱龙门机床开展滑块不同运动速度下的双直线电机同步驱动实验.实验结果表明,提出的方法不仅在处理不确定性和时变干扰方面具有显著的效果,而且能够保证该机床高精度同步运动.随着滑块运动速度的提高,提出的H_∞-交叉耦合控制算法比传统的PID同步控制算法具有更好的动态性能.

关键词：大型双驱龙门机床拉格朗日方程 H∞控制交叉耦合同步控制

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

Characterization of a novel fluidic friction-reduction tool used in extended-reach well considering periodic particle-laden jet

引用

Petroleum Science 2023年第6期20卷 3700-3711页

作者： Lu-Bo Tang Xiao-Bin Chen Wei-Wei xin shao-he Zhang xin-xin Zhang School of Civil Engineering Central South UniversityChangsha410083HunanChina Jiangxi Geological Exploration Bureau for Non-ferrous Metals Nanchang330000JiangxiChina Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of EducationChangsha410083HunanChina School of Geosciences and Info-Physics Central South UniversityChangsha410083HunanChina

Fluidic oscillators(FOs)can be used as an efficient fluidic vibration tool to solve high friction problems in extended-reach ***,the complex mechanism of FOs makes the design challenging,and the dynamic erosion behavior inside FOs is still *** this paper,new FOs are proposed and the working characteristics under the influence of periodic particle-laden jets are ***,the results reveal the working mechanism of new FOs,showing that the generation of pressure pulses is closely connected with periodic jet switching and the development of ***,the important performance parameters,i.e.,pressure pulse and oscillation frequency,are extensively studied through numerical simulation and experimental *** is found that the performance can be optimized by adjusting the tool structure according to different engineering ***,the oscillating solid-liquid two-phase flow inside FO is *** is demonstrated that the accumulation of particles leads to a significant reduction in *** results also reveal five locations that are susceptible to erosion and the erosion behavior of these locations are *** has been shown that the periodic jet causes fluctuations in the amount of erosion at the outlet and *** research can provide valuable references for the design and optimization of vibration friction-reduction tools.

关键词： Extended-reach well Fluidic oscillator Vibratory tool Erosion Friction reduction

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 Zn addition on microstructure and mechanical properties of Mg-3Y-2Nd-0.5Zr alloy

引用

China Foundry 2023年第4期20卷 299-306页

作者： Fei-yu he Wen-xin Hu Li-juan Liu shao-bo Ma Wei he State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou 014030Inner MongoliaChina Baotou Research Institute of Rare Earths Baotou 014030Inner MongoliaChina Technical Center of Steel Union Co. Ltd.of Baotou Steel(Group)Corp.Baotou 014010Inner MongoliaChina

The effect of 0.5wt.%Zn addition on the microstructure and mechanical properties of Mg-3Y-2Nd-0.5Zr(WE32)alloy was *** results indicate that WE32-0.5Zn alloy takes 48 h to reach peak hardness after solid solution treatment at 525℃and aging at 200℃,10 h earlier than WE32 alloy,which implies an accelerated aging precipitation kinetics owing to the addition of 0.5wt.%Zn.A large quantity of finerod and rectangular block-like Zn-Zr precipitates in theα-Mg matrix are formed in the WE32-0.5Zn alloy,and numerous needle-likeβ1phases are distributed at both ends of the Zn-Zr precipitates at peak-aged *** peak-aged condition,the ultimate tensile strength considerably increases from 263.2 MPa(WE32)to 309.6 MPa(WE32-0.5Zn),and the elongation dramatically increases from 4.3%(WE32)to 8.9%(WE32-0.5Zn).Theβ’andβ1phases are the main precipitates of the WE32-0.5Zn alloy peak-aged at 200℃.Theβ’andβ1phases easily nucleate at the Zn-Zr precipitates,and theβ1phases are particularly likely to nucleate and grow at the interface between the two ends of the Zn-Zr precipitates,which accelerates aging precipitation kinetics and leads to a shorter time to achieve peak aging.

关键词： Mg-3Y-2Nd-0.5Zr Zn-Zr precipitates microstructure mechanical properties

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

Dynamics of soil inorganic phosphorus fractions at aggregate scales in a chronosequence of Chinese fir plantations

引用

Journal of Mountain Science 2022年第1期19卷 136-150页

作者： ZHANG Zhe HUANG Yong-zhen he xin-xin YE shao-ming WANG Sheng-qiang Forestry college Guangxi UniversityNanning 530004China

Successive cultivation of Chinese fir(Cunninghamia lanceolata) would markedly affect the distribution and accumulation of soil inorganic phosphorus(Pi).However,how different chronosequence phases of Chinese fir plantations exerting influences on the quality and quantity of soil Pi fractions in aggregate-scale remain poorly understood. This study researched the dynamic changes of aggregate-related Pi fractions encompassing occluded-P(O-P), aluminum-bound P(Al-P), iron-bound P(Fe-P), and calcium-bound P(Ca-P) in topsoil(0-20 cm) from different stand aged(9-, 17-, and 26-yr) Chinese fir plantations and one nearby abandoned land(CK) in Rongshui County,Guangxi, China. In this study, soil aggregates were classified into micro-aggregates( 2 mm) by one wet-sieving process. As the primary aggregate fractions correlated with better soil aggregate stability, the large macro-aggregates took the highest proportion in all aggregate sizes regardless of various stand ages of Chinese fir plantations. Besides, the 17-yr plantations of Chinese fir displayed the highest stability of aggregates structure. Compared with CK, all four soil Pi fractions from three different stand ages of Chinese fir plantations generally showed increasing *** of chronosequence phases, Al-P was mainly carried by small macro-aggregates. O-P showed the opposite tendency to Al-P, which had the lowest content in small macro-aggregates. Fe-P and Ca-P showed an even distribution in all *** contribution rates and stocks of each Pi fraction exhibited close relevance to the content of soil aggregates. As revealed from the results, planting of Chinese fir before 17-yr was beneficial to prompt the formation of large macro-aggregates and the level of soil P. But after 17-yr, successive monoculture planting of Chinese fir would reduce the stability of soil aggregates and render the losses

关键词： Inorganic phosphorus fractions Soil aggregates Chinese fir plantations Cunninghamia lanceolata

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

mRNA expression and DNA methylation in three key genes involved in caste differentiation in female honeybees(Apis mellifera)

引用

Zoological Research 2014年第2期35卷 92-98页

作者： xin-Liang shao shao-Yu he xin-Ying ZHUANG Ying FAN Ya-Hui LI Yong-Gang YAO College of Animal Science and Technology Yunnan Agricultural University Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences & Yunnan Province Kunming Institute of Zoology Eastern Bee Institute Yunnan Agricultural University College of Food Science and Technology Yunnan Agricultural University

In honeybee （Apis mellifera） colonies, queens and workers are altemative forms of the adult female honeybee that develop from genetically identical zygotes but that depend on differential nourishment. Queens and workers display distinct morphologies, anatomies and behavior, better known as caste differentiation. Despite some basic insights, the exact mechanism responsible for this phenomenon, especially at the molecular level, remains unclear although some progress has been achieved. In this study, we examined mRNA levels of the TOR （target of rapamycin） and Dnmt3 （DNA methyltransferase 3） genes, closely related to caste differentiation in honeybees. We also investigated mRNA expression of the S6K （similar to RPS6-p70-protein kinase） gene linked closely to organismal growth and development in queen and worker larvae （1-day and 3-day old）. Last, we investigated the methylation status of these three genes in corresponding castes. We found no difference in mRNA expression for the three genes between 1st instar queen and worker larvae; however, 3rd instar queen larvae had a higher level of TOR mRNA than worker larvae. Methylation levels of all three genes were lower in queen larvae than worker larvae but the differences were not statistically significant. These findings provide basic data for broadening our understanding of caste differentiation in female honeybees.

关键词： Caste differentiation DNA methylation DNA methyltransferase 3 Honeybee Target of rapamycin

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

Exit morphology and mechanical property of FDM printed PLA: influence of hot melt extrusion process

引用

Advances in Manufacturing 2023年第1期11卷 56-74页

作者： Yan-Hua Bian Gang Yu xin Zhao shao-Xia Li Xiu-Li he Chong-xin Tian Zhi-Yong Li Institute of Mechanics Chinese Academy of SciencesBeijing100190People’s Republic of China School of Engineering Science University of Chinese Academy of SciencesBeijing100049People’s Republic of China Research Institute of 3D Printing Beijing City UniversityBeijing100083People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049People’s Republic of China

In order to study the hot melt extrusion process in fused deposition modeling(FDM),this study mainly explores the effects of printing temperature,heated block length,feeding speed on the exit morphology and mechanical properties of FDM printed Polylactic acid(PLA)***-speed camera is used to capture the exit morphology of molten PLA just extruded to the *** to exit morphology,the outlet states of extruded molten material can be divided into four categories,namely,bubbled state,coherent state,expanding state,and unstable *** test results show that printing temperature,heated block length and printing speed have significant influence on tensile properties and fracture mode of FDM printed *** the heated block length is 15 mm and 30 mm,there is a ductile-brittle transition in fracture mode with the increase of printing *** printing process window under different heated block lengths and printing temperatures has been figured out and the distribution of printing process window under different printing speeds has been *** is a maximum printing process window under the heated block length of 30 *** finding provides a frame work for performance prediction of FDM printed parts and theoretical guidance for expanding the scope of printing process window.

关键词： Fused deposition modeling(FDM) Polylactic acid(PLA) Exit morphology Tensile property Printing process window

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

Characteristics of maize residue decomposition and succession in the bacterial community during decomposition in Northeast China

引用

Journal of Integrative Agriculture 2021年第12期20卷 3289-3298页

作者： ZHAO Shi-cheng Ignacio ACIAMPITTI QIU shao-jun XU xin-peng he Ping Key Laboratory of Plant Nutrition and Fertilizer Ministry of Agriculture and Rural Affairs/lnstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081P.R.China Department of Agronomy Kansas State UniversityManhattanKS 66506USA

Microbes are decomposers of crop residues,and climatic factors and residue composition are known to influence microbial growth and community composition,which in turn regulate residue ***,the succession of the bacterial community during residue decomposition in Northeast China is not well *** clarify the property of bacterial community succession and the corresponding factors regulating this succession,bags containing maize residue were buried in soil in Northeast China in October,and then at different intervals over the next 2 years,samples were analyzed for residue mass and bacterial community *** residue burial in the soil,the cumulative residue mass loss rates were 18,69,and 77%after 5,12,and 24 months,*** release of residue nitrogen,phosphorus,and carbon followed a similar pattern as mass loss,but 79%of residue potassium was released after only 1 *** abundance,richness,and community diversity of bacteria in the residue increased rapidly and peaked after 9 or 20 *** decomposition was mainly influenced by temperature and chemical composition in the early stage,and was influenced by chemical composition in the later *** Actinobacteria,Bacteroidetes,and Firmicutes dominated the bacterial community composition in residue in the early stage,and the abundances of phyla Chloroflexi,Acidobacteria,and Saccharibacteria gradually increased in the later stage of *** conclusion,maize residue decomposition in soil was greatly influenced by temperature and residue composition in Northeast China,and the bacterial community shifted from dominance of copiotrophic populations in the early stage to an increase in oligotrophic populations in the later stage.

关键词： crop residue decomposition bacteria microbial community succession nutrient release climate condition

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

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：