检索结果-南通市图书馆

Scheduling Algorithm for Data Flow Model in Real-time Control System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Scheduling Algorithm for Data Flow Model in Real-time Contro...

FAM213B基因启动子在猪子宫内膜细胞的转录调控

2010 3rd International Conference on Computer and Electrical Engineering(ICCEE 2010)

作者： Chenggang Qin Dong Yu Wenjiang Wu xiaozhang lu Shenyang Institute of Computing Technology Graduate University of Chinese Academy of Science Shenyang Golding NC Technology CO. Ltd Chinese Academy of Science Shenyang

In many real-time control systems, data flow is the base structure of software model. The QoC (Quality of Control) of some systems not only relate to whether the temporal constraints of real-time tasks can be met, but also relate to whether the data flow is non-suspending. While the data flow is suspending, both the control precision and running speed would degrade. For preventing the data flow suspending, we introduce a real-time scheduling algorithm that considers the risk of data flow suspending. We also present an implementation framework for real-time scheduling algorithm based on RTAI. It can simplify the implementation and verification of real-time scheduling algorithm. The results of verification manifest the DFO-RSA algorithm can prevent the data flow suspending effectively while guarantee the temporal constraints of critical tasks.

关键词： Real time control system real-time scheduling algorithm data-flow real-time operating system

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

中国农业科学 2017年第23期50卷 4632-4643页

作者：张爱玲孙显月卢孝璋吴琦李加琪张豪广东高校应用生态工程技术开发中心/广东第二师范学院生物与食品工程学院华南农业大学动物科学学院/广东省农业动物基因组学与分子育种重点实验室

【目的】分析猪FAM213B基因启动子转录活性区域,并检测转录因子NFκB对启动子活性及猪FAM213B基因表达影响,为深入了解FAM213B基因的转录调控机制影响前列腺素合成、母猪妊娠等繁殖活动奠定基础。【方法】采集卵泡期子宫,分离子宫内膜... 详细信息

【目的】分析猪FAM213B基因启动子转录活性区域,并检测转录因子NFκB对启动子活性及猪FAM213B基因表达影响,为深入了解FAM213B基因的转录调控机制影响前列腺素合成、母猪妊娠等繁殖活动奠定基础。【方法】采集卵泡期子宫,分离子宫内膜上皮组织,经胶原酶方法获得猪原代子宫内膜细胞,用于猪FAM213B基因启动子活性检测。参照笔者所在课题组前期研究获得的猪FAM213B基因m RNA全序列(Gen Bank登录号:KX444503)以及5￠调控区序列(Gen Bank登录号:100134955),通过PCR扩增猪FAM213B基因较长启动子序列,并进行测序鉴定;在此基础上,PCR扩增带有Mlu I和Xho I限制性酶切位点的FAM213B基因启动子7个5’端缺失片段,并通过双荧光素酶报告基因载体系统构建猪FAM213B基因启动子7个不同的5’端缺失载体。将7个载体经无内毒素处理后与p RL-TK质粒用阳离子脂质体法一起转染猪子宫内膜细胞,用双荧光素酶报告基因系统进行luciferase活性检测,比较各启动子片段转录活性。生物信息学分析FAM213B基因启动子潜在转录因子结合位点,通过Ch IP试验验证FAM213B基因启动子与潜在转录因子NFκB的相互作用。构建NFκB1和Rel A的超表达载体,化学合成NFκB1和Rel A的干扰si RNA片段,分别转染猪子宫内膜细胞,通过双荧光素酶报告基因系统进行luciferase活性检测和荧光定量PCR分别检测超表达和干扰表达NFκB1和Rel A对猪FAM213B基因启动子活性和m RNA表达影响。【结果】PCR和测序获得猪FAM213B基因启动子长度为2 261bp(-2178/+83)。生物信息学预测结果表明猪FAM213B基因启动子区存在潜在的CREB、CCAAT增强子结合蛋白、E-box因子的结合位点,炎性因子NFκB潜在结合位点分别位于-1143/-1132和-664/-655区间。启动子报告基因活性检测结果表明:重组载体P2(-1352/+30)荧光活性最高,极显著高于P1(-1 760/+30)(P<0.01),在-1 760/-1 352区域存在负调控元件;而P2显著高于P3(-919/+30)(P<0.05),表明在-1352/-919区域存在正调控元件;P3(-919/+30)活性极显著高于P4(-604/+80)(P<0.01),表明在-919/-604区域存在正调控元件;P4、P5、P6和P7活性差异不显著,-1352/-919区域为核心启动子区,-1352/-604对于维持该启动子较高转录活性起着重要的作用。Ch IP结果表明启动子区-1143/-1132存在NFκB1结合位点,-664/-655存在Rel A结合位点。超表达载体pc DNA3.1-NFκB1与P2(-1352/+30)启动子片段重组载体共转染猪子宫内膜细胞后,P2启动子活性极显著高于对照组(P<0.01),pc DNA3.1-NFκB1载体单独转染猪子宫内膜细胞后FAM213B基因m RNA表达量显著高于对照组(P<0.05);超表达载体pc DNA3.1-Rel A与P3(-919/+30)启动子片段重组体共转染猪子宫内膜细胞,P3启动子活性极显著低于对照组(P<0.05),pc DNA3.1-Rel A载体单独转染猪子宫内膜细胞后,FAM213B基因的mRNA表达量显著低于对照组。转染NFκB1和Rel A的si RNA片段干扰片段,FAM213B基因启动子活性和m RNA表达量则表现与超表达相反的结果。【结论】获得了猪FAM213B基因启动子核心启动子序列为-1352/-919区域,NFκB是FAM213B基因启动子的转录因子,NFκB成员NFκB1和Rel A在猪子宫内膜细胞中对FAM213B基因的表达起调控作用。

关键词：猪 FAM213B基因启动子 NFκB 子宫内膜细胞

基于OBC资料的叠前裂缝预测在涠西南潜山储层中的应用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

地球物理学进展 2024年第2期39卷 800-810页

作者：鲁统祥李明周凡黎孝璋刘爱群中海石油(中国)有限公司湛江分公司湛江524057 中海石油(中国)有限公司海南分公司海口570100

基于叠前道集振幅随方位变化(AVAZ)的叠前裂缝预测方法对小尺度裂缝具有较好的预测效果,但鲜少见到在海洋地震资料中应用,主要原因是,受海洋地震采集制约,海洋宽方位地震资料采集较少,单方位覆盖次数低,且不同方位偏移距及覆盖均衡性差... 详细信息

基于叠前道集振幅随方位变化(AVAZ)的叠前裂缝预测方法对小尺度裂缝具有较好的预测效果,但鲜少见到在海洋地震资料中应用,主要原因是,受海洋地震采集制约,海洋宽方位地震资料采集较少,单方位覆盖次数低,且不同方位偏移距及覆盖均衡性差,较难满足AVAZ对叠前道集的要求.本文总结了一套适用于涠西南海洋OBC地震资料的叠前裂缝预测处理流程,从OVT成果道集着手,提出基于方位各向异性保持的去噪处理技术,针对不同方位数据均衡性差等不足开展偏移距及方位分组优选,并基于此预处理道集开展AVAZ叠前裂缝预测,预测结果与新钻井成像测井结果吻合,验证了本文方法的可行性.

关键词：叠前裂缝预测 AVAZ 方位各向异性 OVT道集去噪方位优选

Numerical simulation of metal evaporation based on the kinetic model equation and the direct simulation Monte Carlo method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第12期27卷 361-367页

作者： Xiaoyong lu xiaozhang Zhang1 Zhizhong Zhang Department of Engineering Physics Tsinghua UniversityBeijing 100084China Research Institute of Physics and Chemical Engineering of Nuclear Industry Tianjin 300180China

Metal evaporation on the basis of the kinetic model equations(BGK and S-model) and the direct simulation Monte Carlo(DSMC) method was investigated computationally under the circumstances of collimators existing or not. Numerical data of distributions of number density, bulk velocity and temperature were reported over a wide range of evaporation *** was shown that these results reached a good agreement for the case of small evaporation rate, while the deviations became increasingly obvious with the increase of evaporation rate, especially when the collimators existed. Moreover, the deposition thickness over substrate obtained from the kinetic model equations were inaccurate even though the evaporation rate was small. All of the comparisons showed the reliability of the kinetic model equations, which require less computational cost at small evaporation rate and simple structure.

关键词： kinetic model equations DSMC metal evaporation collimators

Degradation kinetics and mechanism of trace nitrobenzene by granular activated carbon enhanced microwave/hydrogen peroxide system

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第7期25卷 1492-1499页

作者： Dina Tan Honghu Zeng Jie Liu xiaozhang Yu Yanpeng Liang Lanjing lu College of Environmental Science and Engineering Guilin University of Technology Guangxi Institute of Building Research & Design Guangxi Polytechnic of Construction

The kinetics of thedegradation of trace nitrobenzene （NB） by a granular activated carbon （GAC） enhanced microwave （MW）/hydrogen peroxide （H202 ） systemwas studied. Effects of pH, NB initial concentration and tert-butyl alcohol on the removal efficiencywere examined. Itwas found that the reaction rate fitswell to first-order reaction kinetics in the MW/GAC/H202 process. Moreover, GAC greatly enhanced thedegradation rate of NB inwater. Under a given condition （MW power300 W, H202dosage 10 mg/L, pH 6.85 and temperature （60 ± 5）°C）, thedegradation rate of NBwas 0.05214 min 1when4 g/L GACwas added. In general, alkaline pHwas better for NBdegradation; however, the optimum pHwas 8.0 in the tested pH value range of4.0-12.0. At H202dosage of 10 mg/L and GACdosage of4 g/L, the removal of NBwasdecreasedwith increasing initial concentrations of NB, indicating that a low initial concentrationwas beneficial for thedegradation of NB. These results indicated that the MW/GAC/H202 processwas effective for trace NBdegradation inwater. Gas chromatography-mass spectrometry analysis indicated that a hydroxyl radical addition reaction anddehydrogenation reaction enhanced NBdegradation.

关键词： microwave granular activated carbon hydrogen peroxide nitrobenzene hydroxyl radicals

深圳河流域2023年“9·7”极端特大暴雨分析及洪涝治理思考

在线全文

学校读者我要写书评

暂无评论

中国防汛抗旱 2024年第1期34卷 24-28页

作者：卢陈胡晓张吴尧高时友吕文斌珠江水利委员会珠江水利科学研究院广州510610 水利部珠江河口治理与保护重点实验室广州510611

城市暴雨洪涝灾害是目前我国城市最突出的水患灾害。2023年9月7日,深圳市发生极端特大暴雨,深圳河流域处于暴雨中心,造成较严重洪涝灾害,本次暴雨洪涝灾害为流域水安全保障敲响了警钟。通过全面总结深圳河流域暴雨洪涝特性及防御情况,... 详细信息

城市暴雨洪涝灾害是目前我国城市最突出的水患灾害。2023年9月7日,深圳市发生极端特大暴雨,深圳河流域处于暴雨中心,造成较严重洪涝灾害,本次暴雨洪涝灾害为流域水安全保障敲响了警钟。通过全面总结深圳河流域暴雨洪涝特性及防御情况,分析暴雨洪涝灾害成因,在此基础上,从提高河道泄洪能力、增大流域洪水调蓄能力、加强城市排水防涝能力建设、强化超标准暴雨应急管理能力等方面提出洪涝治理对策,思考城市洪涝治理方式和理念,为系统解决洪涝问题、提升高密度城市洪涝防御能力提供参考。

关键词：洪涝灾害深圳河流域深圳市2023年“9·7”极端特大暴雨洪涝洪涝共治

Piezoelectric-AIN resonators at two-dimensional flexural modes for the density and viscosity decoupled determination of liquids

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2022年第2期8卷 23-34页

作者： Linya Huang Wei Li Guoxi luo Dejiang lu Libo Zhao Ping Yang xiaozhang Wang Jiuhong Wang Qijing Lin Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesOverseas Expertise Introduction Center for Micro/Nano Manufacturing and Nano Measurement Technologies Discipline InnovationXi'an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemXi'an Jiaotong UniversityXi'an 710049China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049China The Eleventh Research Institute of The Sixth Academy of CASC Xi'an 710100China

A micromachined resonator immersed in liquid provides valuable resonance parameters for determining the fluidic ***,the liquid operating environment poses a challenge to maintaining a fine sensing performance,particularly through electrical *** paper presents a piezoelectric micromachined cantilever with a stepped shape for liquid monitoring *** modes of the proposed cantilever are available with full electrical characterization for realizing self-actuated and seif-sensing *** focus is on higher flexural resonances,which nonconventionally feature two-dimensional vibration *** analyses are conducted for the developed cantilever under flexural vibrations at different *** explains not only the basic length-dominant mode but also higher modes that simultaneously depend on the length and width of the *** study determines that the analytical predictions for resonant frequency in liquid media exhibit good agreement with the experimental ***,the experiments on cantilever resonators are performed in various test liquids,demonstrating that higher-order flexural modes allow for the decoupled measurements of density and *** measurement differences achieve 0.39%in density and 3.50%in viscosity,and the frequency instability is below 0.05%*** the basis of these results,design guidelines for piezoelectric higher-mode resonators are proposed for liquid sensing.

关键词： flexural cantilever viscosity

Raw Gangue Filling Mining under Construction —A Case Study in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering（科研） 2023年第3期15卷 176-195页

作者： Daqing Li Changxiang Wang Jinjie Xiao Wei lu Baoliang Zhang Zongkai Li xiaozhang Tong Huainan Emergency Management Bureau Huainan China College of Safety Science and Engineering Anhui University of Science and Technology Huainan China Shandong Lineng Liyan Mining Engineering Co. Ltd. Jining China College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao China School of Architecture & Civil Engineering Liaocheng University Liaocheng China Shandong Energy Linyi Mining Group Co. Ltd. Wanglou Coal Mine Linyi China National Engineering Research Center for Coal Gas Control Huainan China

In order to recover the strip pillar coal resources, reduce the amount of gangue mountain and realize remediation of the goaf environment in the old mining area, the raw gangue filling mining technology was proposed. According to the previous practical experience, the feasibility of the implementation of raw gangue filling mining technology in the coal-pressed area was analyzed. Through the filling gangue compaction test, the deformation under different loading stages was obtained. Further, a reasonable prediction of the deformation beyond the experimental limited loading load was made based on the experimental results. Through the deformation source analysis of the whole process of gangue filling, the key factors for controlling deformation before, during, and after filling were determined. Additionally, the proportion of deformation during different stages was quantified. Considering the protection of surface buildings, mining fullness of the working face and mining technology, the production parameters of 1209 and 1210 filling working faces were preliminarily determined. Through numerical simulation, the rationality of mining scheme was verified. Based on the practice of 1209 working face and the key factors to control the deformation of gangue filling, the mining system and process in 1210 working face were optimized. According to the measured surface rock movement, raw gangue filling mining technology can meet the requirements of surface building protection level. Especially, this paper provides a method to quantitatively calculate the equivalent mining height (EMH) of raw gangue filling and its mining deformation, which has reference significance for old mining areas.

关键词： Coal Resource Recovery under Construction Raw Gangue Filling Mining Principle of Space-Time Control Filling System and Process Innovation

Monolithically integrated triaxial high-performance micro accelerometers with position-independent pure axial stressed piezoresistive beams

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2023年第1期9卷 91-102页

作者： Mingzhi Yu Libo Zhao Shanshan Chen Xiangguang Han Chen Jia Yong Xia xiaozhang Wang Yonglu Wang Ping Yang Dejiang lu Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong University710049Xi’anChina Xi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and System Xi’an Jiaotong University710049Xi’anChina Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing 265503YantaiChina

With the increasing demand for multidirectional vibration measurements,traditional triaxial accelerometers cannot achieve vibration measurements with high sensitivity,high natural frequency,and low cross-sensitivity ***,for piezoresistive accelerometers,achieving pure axial deformation of the piezoresistive beam can greatly improve performance,but it requires the piezoresistive beam to be located in a specific position,which inevitably makes the design more complex and limits the performance ***,a monolithically integrated triaxial high-performance accelerometer with pure axial stress piezoresistive beams was designed,fabricated,and *** controlling synchronous displacements at both piezoresistive beam ends,the pure axial stress states of the piezoresistive beams could be easily achieved with position independence without tedious *** measurement unit for the z-axis acceleration was innovatively designed as an interlocking proof mass structure to ensure a full Wheatstone bridge for sensitivity *** pure axial stress state of the piezoresistive beams and low cross-sensitivity of all three units were verified by the finite element method(FEM).The triaxial accelerometer was fabricated and *** showing extremely high sensitivities(x axis:2.43 mV/g/5 V;y axis:2.44 mv/g/5 V;z axis:2.41 mV/g/5 V(without amplification by signal conditioning circuit))and high natural frequencies(x/y axes:11.4 kHz;z-axis:13.2 kHz)were *** approach of this paper makes it simple to design and obtain high-performance piezoresistive accelerometers.

关键词： axial proof independence