检索结果-南通市图书馆

Droplet Evaporation to Boiling in Van Der Waals Fluid

Journal of Thermal Science 2022年第3期31卷 790-801页

作者： XIONG Hongbing wang qichao ZHANG Chengyu wang Huigang LIN Jianzhong State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310027China Xiaomi Communication Technology Shanghai200235China

Superheated droplets vaporized in a vacuum or vapor chamber was studied using smoothed particle hydrodynamics *** two-phase fluids of vapor and liquid with a diffused interface were modeled by Navier-Stokes-Korteweg equations,with the van der Waals equation of *** liquid-vapor separation was processed with different initial temperature and *** was firstly validated by the proper equilibrium states with analytical data from the binodal line of Maxwell construction,as well as the droplet surface tension compared with experimental and other groups’numerical data in a good *** morphology,density,temperature and entropy increment were then carefully examined during the dynamic process from evaporation to *** phase transitions patterns were concluded,namely from surface evaporation,internal bubble,fragment and explosion,to flash boiling with increasing equivalent superheat degree that is defined by the non-dimensional superheat temperature over surface *** showed that droplet temperature and density decreased slightly at surface evaporation when equivalent superheat degree was lower than 1/*** this criterion,the internal bubble could be *** of new liquid nucleates and connected secondary liquid ring were calculated by domain growth *** found that droplet continuous to expand at high superheat but withdrawn at equivalent superheat degree equal to or lower than *** equivalent superheat degree higher than 1,the growth and expansion of droplet resulted in liquid fragment and explosion to many small secondary *** mass and diameter of these droplets were found to have power-law dependency on the expansion ***,fast flash boiling occurred at equivalent superheat degree higher than *** vapor pressure in the chamber showed a negative linear correlation between the overpressure and the atmospheric *** also found out that comparing to increase the pressure value,dens

关键词： heat and mass transfer multiphase flow fluid mechanics phase separation atomization pulsed laser ablation

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

Mercury distribution and bioaccumulation up the soil-plant-grasshopper-spider food chain in Huludao City, China

引用

Journal of Environmental Sciences 2010年第8期22卷 1179-1183页

作者： Zhongsheng Zhang qichao wang Dongmei Zheng Na Zheng Xianguo Lu Key Laboratory of Wetland Ecology and Environment Institute of Northeast Geography and Agroecology Chinese Academy of Science Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Eco-remediation of Contaminated Environment and Resource Reuse Shenyang University Shenyang 110044 China

The purpose of this study is to investigate total mercury （THg） distribution and its bioaccumulation up the soil-plant-grasshopperspider in the Huludao City, which is polluted seriously by chlor-alkali and zinc smelting industry in Northeast of China. Results indicated that average THg concentrations in soil, plant leaves, grasshopper Locusta migratoria manilensis and Acrida chinensis, and spider were 0.151, 0.119, 0.167 and 0.134 mg/kg, respectively. THg spatial distribution suggested that most of mercury came from the chlor-alkali plant and the two zinc smelteries. The highest mercury concentration was found in the wings among different grasshoppers’ organs. Although spiders are the predatory, THg concentrations in their bodies were not high, and only on the same level as in grasshoppers, which might be due to spiders’ special living habits. In the light of the mercury transportation at every stage of the soil-plant-grasshopper-spider food chain, the bioaccumulation factors were 0.03, 0.79–1.11 and 0.80–1.13 respectively. It suggested that mercury biomagnification up terrestrial food chains was not so large and obvious as it was in the aquatic food chain.

关键词： mercury soil plant grasshopper spider bioaccumulation food chain

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 genomics： An overview

引用

Frontiers in Biology 2013年第6期8卷 569-576页

作者： qichao wang Xianmin ZHU Yun FENG Zhigang XUE Guoping FAN Stem Cell Research Center Department of Regenerative Medicine Tongji University School of Medicine Tong/i University Shanghai 200092 China Advanced Institute of Translational Medicine Tongji University Shanghai 200092 China School of Life Sciences and Technology Tongji University Shanghai 200092 China Department of Human Genetics UCLA Los Angeles CA 90095 USA

The newly developed next-generation sequencing platforms, in combination with gcnome-scale amplification methods, provide a powerful tool to study genomics from a single cell. This mini-review summarizes the technologies of single cell genomics and their applications in several areas of biomedical research including stem cells, cancer biology and reproductive medicine. Particularly, it highlights recent advances in single cell exome sequencing, RNA-seq, and genome sequencing. The application of these powerful techniques will shed new light on the fundamental principles of gene transcription and genome organization at single-cell level and improve our understanding of cellular heterogeneity and diversity in multicellular organisms

关键词： single-cell genomics next-generation sequencing RNA-seq single-nucleotide variation copy-number variation DNA methylation

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

Genome-wide identification of WRKY gene family and expression analysis under abiotic stresses in Andrographis paniculata

引用

BIOCELL 2021年第4期45卷 1107-1119页

作者： qichao wang WUJING ZENG BASHARAT ALI XUEMIN ZHANG LING XU ZONGSUO LIANG Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation College of Life Sciences and MedicineZhejiang Sci-Tech UniversityHangzhou310018China Department of Agronomy University of AgricultureFaisalabad38040Pakistan Tianjin Tasly Modern TCM Resources Co. Ltd.Tianjin300410China

Andrographis paniculata(***)is a Chinese herbal medicine that clears away heat,reduces inflammation,protects the liver,and promotes *** WRKYs of *** are still not well characterized,although many WRKYs have been identified in various plant *** the present study,59 *** WRKY(ApWRKY)genes were identified and renamed on the basis of their respective chromosome *** ApWRKYs were divided into three groups via phylogenetic analysis according to their WRKY domains and combined with WRKY of *** 59 identified ApWRKY transcription factors were nonuniformity distributed on 23 chromosomes of *** the structural analysis of the conserved motifs,different ApWRKYs structures showed different biological functions,and the ApWRKY transcription factor had certain species-specificity in the evolutionary *** expression patterns of the 41 ApWRKYs were examined through quantitative real-time PCR(qRT-PCR)in various tissues and under abiotic stresses(salt).The results showed that most of the ApWRKY had different reactions to salt *** addition,the content of the four main secondary metabolites in *** leaves was determined under salt *** results show that under a low concentration of salt treatment,the synthesis of andrographolide can be improved.

关键词： A.paniculata ApWRKY Secondary metabolites Diterpene lactones Andrographolide Abiotic stress

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

Comfort evaluation and position parameter optimization of the steering wheel in agricultural machinery based on a three-level evaluation index system

引用

International Journal of Agricultural and Biological Engineering 2022年第4期15卷 214-222页

作者： qichao wang Yujun Shang Zengzhi Qin Hongmei Xu Wei Jiang Hang Li Guozhong Zhang College of Engineering Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan 430070China

The aim of this study is to evaluate the comfort and optimize the position parameters of steering *** the H point of driver as the reference point,three position parameters of steering wheel were determined,which were used as experimental factors.A comprehensive evaluation index system of the comfort was *** comfort range and optimal levels of three parameters were determined by a single factor test,based on which a response surface optimization and validation test was carried *** optimization and validation test results show that the expected comprehensive score of the comfort is 0.864,and the average relative error between the predicted and the measured value is 4.18%,indicating that the optimization results are *** findings can provide reference for the comfort optimization design of steering wheel in agricultural devices.

关键词： agricultural equipment steering wheel comfort evaluation position parameter optimization

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

The Early Precambrian Rocks,Their Ages,Division and Correlation of the Taihang-Wutai Region, the Yanshan Region and the Eastern Sector of the Yinshan Mountains

引用

Acta Geologica Sinica(English Edition) 1988年第3期1卷 249-266页

作者： wang qichao Hebei Regional Geological Surveying Party, Langfang, Hebei Hebei Regional Geological Surveying Party Langfang Hebei

According to differences of the protolith formations, the early Precambrian strata in the northern part ofthe North China platform may be divided into the stable stratigraphic region in the west and the mobilestratigraphic region in the east. Based on unconformities, either stratiragphic or tectonic, as well as significantmetamorphic thermal events, the two regions may be stratigraphically defined as follows: 1) the middleArchaean Fuping Supergroup composed of the Chenzhuang and Wanzi Groups (stable areas), and the middleArchaean Qianxi Group (mobile area), whose upper limits are all dated at 2800 Ma; and 2) the upper ArchaeanWutai Supergroup composed of the Longquanguan, Shizui and Taihuai Groups (stable areas), and the upperArchaean Zunhua, Dantazi and Zhuzhangzi Groups (mobile areas). whose upper limits are all dated at 2500Ma. A correlation of the above-mentioned units is also made. The lower Proterozoic Hutuo Group of the sta-ble region is adjusted to comprise the Gaofan, Doucun, Dongye and Guojiazhai Groups. The upper limit of theGaofan Group is placed at 2350 Ma, Dongye 1850 Ma and Guojiazhai (the lower limit of the Changcheng Sys-tem) 1700 Ma.

关键词： meta the Yanshan Region and the Eastern Sector of the Yinshan Mountains The Early Precambrian Rocks,Their Ages,Division and Correlation of the Taihang-Wutai Region

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

Optimization of the key position parameters for tractor steering wheel based on a driver’s arm muscle load analysis

引用

International Journal of Agricultural and Biological Engineering 2023年第5期16卷 236-247页

作者： Hongmei Xu Hao Yang Yujun Shang Yinpei Zhang Zhangfen Liu qichao wang Guozhong Zhang College of Engineering Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Agricultural Equipment in Mid-lower Reaches of the Yangtze River Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan 430070China

Steering wheel is the most frequently used manual device in tractors,whose position directly affects the handling comfort of the driver and fatigue degree of the arm *** this study,the biomechanical modelling software AnyBody was used for an inverse kinetics analysis of the rotation process of tractor steering wheel,calculate the muscle activation degree of the driver’s arm and compare it with the calculated results of surface EMG tests to verify the reliability of the biomechanical *** on the biomechanical model,the effects of three position parameters(steering wheel inclination,front-back distance,and upper-lower height)on the activation degree of the driver’s arm muscles were *** results demonstrated that steering wheel inclination has the most significant effect on the degree of muscle activation,followed by the upper-lower height and then front-back *** the interaction among factors,a regression orthogonal test was designed,and the test results revealed that the minimum muscle activation(1.2887)can be obtained with the steering wheel inclination of 31°,front-back distance of 431 mm and upper-lower height of 375 *** findings can provide a reference for optimizing the structure and position parameters of tractor steering wheels.

关键词： tractor steering wheel driver’s arm biomechanical characteristics position parameter optimization

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

制造业企业扩大金融活动能够提高生产率吗?

引用

广东社会科学 2021年第6期 51-59页

作者：王启超首都经济贸易大学经济学院北京100070

基于我国制造业企业不断增加持有金融资产的现象,以及"脱实向虚"倾向可能对生产率和国家创新能力产生重要影响的背景,使用2007—2018年制造业上市公司数据实证发现,我国制造业企业扩大金融活动对全要素生产率总体呈现显著的负向影响,但... 详细信息

基于我国制造业企业不断增加持有金融资产的现象,以及"脱实向虚"倾向可能对生产率和国家创新能力产生重要影响的背景,使用2007—2018年制造业上市公司数据实证发现,我国制造业企业扩大金融活动对全要素生产率总体呈现显著的负向影响,但两者并不是简单的"此消彼长"关系。当生产率较低时,扩大金融活动并无益处;反之可以促进生产率提升,促进创新。为了捕捉企业行为异质性因素,进一步分样本分析发现,制造业企业扩大金融活动对国有企业全要素生产率的损害效应尤其显著,当前国有企业生产率水平较低,盲目扩大金融活动只会"雪上加霜"。本文强调制造业企业适度金融投资的意义,引导企业资金转向实物资本投资,建设科技创新强国。

关键词：制造业企业金融活动全要素生产率科技创新强国

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

新《立法法》强化立法规划的法理基础——基于立法规划的实证研究

引用

政治与法律 2023年第10期 109-127页

作者：王起超深圳大学法学院广东深圳518061

有学者曾主张淡化立法规划,但2015年与2023年两次《立法法》的修改确认和强化了立法规划的地位,深入分析强化立法规划的法理基础有重要意义。对过去三十年全国人大常委会立法规划的实证研究发现,立法规划的项目根据“条件是否成熟”进... 详细信息

有学者曾主张淡化立法规划,但2015年与2023年两次《立法法》的修改确认和强化了立法规划的地位,深入分析强化立法规划的法理基础有重要意义。对过去三十年全国人大常委会立法规划的实证研究发现,立法规划的项目根据“条件是否成熟”进行划分,并与后续立法审议和法律通过之间具有密切关联,在“条件是否成熟”这一关键命题上保持着相对可靠且稳定的判断能力,2023年修改的《立法法》中专项立法计划的增加将强化这种判断能力。立法规划的实质功能不是立法机关的工作安排,而是对立法条件成熟的判断;立法规划没有也无法提出公式化的判断标准,其判断的强度取决于“立法速度”与“立法可预期性”之间的张力。在法理上,立法规划保护了民主和效益的价值。面对立法官僚化对民主立法的挑战,立法规划直接向公众宣告立法者对立法条件成熟的判断,保证公民对立法进程的知情;同时,立法规划符合法律市场供给规律,推进法律均衡的达成,并有助于实现立法效益的最大化。结合2023年修订的《立法法》的规定,淡化立法规划的观点不能成立,立法规划的实践效果使得立法规划在实然层面能够被强化,立法规划的价值则使得立法规划在应然层面应当被强化。

关键词：立法规划立法条件成熟立法程序民主立法立法效益

来源：

维普期刊数据库博看期刊

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

从“制造赶超”到“创新引领”:内涵转变与重大政策评估

引用

财经论丛 2022年第5期 3-13页

作者：王启超首都经济贸易大学经济学院北京100070

在讨论不同发展阶段制造强国内涵动态变化的基础上,本文使用2012—2018年中国制造业上市公司数据,发现《中国制造2025》的重点政策对企业全要素生产率的影响经历了不显著到逐渐显著为正的变化过程且仍存在增长空间,采用不同的方法计算... 详细信息

在讨论不同发展阶段制造强国内涵动态变化的基础上,本文使用2012—2018年中国制造业上市公司数据,发现《中国制造2025》的重点政策对企业全要素生产率的影响经历了不显著到逐渐显著为正的变化过程且仍存在增长空间,采用不同的方法计算企业全要素生产率及进行安慰剂检验后的结论非常稳健。进一步的异质性分析结果显示,重点政策对高新技术企业的影响程度尤其明显,对主动创新企业的促进效果更好(相比于被动创新企业)。这一研究发现揭示重大政策在国民经济中的重要作用,面向2035年中国制造业实现创新引领的发展策略是:加强政府战略引领,通过实施重大政策有意识地引导扶持重点领域和关键环节率先突破,发挥重点行业对国民经济的引领和正向带动作用。

关键词：创新引领中国制造2025 重大政策全要素生产率

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：