检索结果-南通市图书馆

Design and Experimental Evaluation of PID Controller for Digital Electro-Pneumatic Cabin Pressure Control System

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2016年第5期33卷 576-583页

作者： Nie Jinfang Pan Quan shen Hao Song zhitao Zhang Dalin College of Automation Northwestern Polytechnical University Xi'an 710072 P.R. China Shanghai Aircraft Airworthiness Certification Center of CAAC Shanghai 200335 P.R. China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing University of Aeronautics and Astronautics Nanjing 210016 P.R. China

The performance of the designed digital electro-pneumatic cabin pressure control system for the cabin pressure schedule of transport aircraft is *** the purpose of this study,an experimental setup consisting of a simulated hermetic cabin and altitude simulation chamber is configured for cabin pressure control system operation.A series of experimental tests are executed to evaluate the performance of the cabin pressure control *** parameters of the PID controller are *** the optimization process,the variation regularity of the rate of cabin pressure change under various conditions is *** approach to prioritize the control of the rate of change of cabin pressure based on the flight status model is proposed and verified *** experimental results indicate that the proposed approach can be adopted for the designed digital electro-pneumatic cabin pressure control system to obtain a better cabin pressure schedule and rate of cabin pressure change.

关键词： cabin pressure control digital electro-pneumatic PID controller

公路基础设施对经济与环境协调发展的影响——来自成渝地区双城经济圈的证据

在线全文

学校读者我要写书评

暂无评论

国土资源科技管理 2024年第1期41卷 100-114页

作者：任晓红冯知滔沈佳潘颖重庆交通大学经济与管理学院重庆400074 重庆交通大学交通运输学院重庆400074

了解公路基础设施对城市经济和环境协调发展的影响可以为城市规划和交通建设提供理论参考。本文基于2010—2020年成渝地区双城经济圈内16个城市的面板数据,通过耦合协调模型测度经济与环境的协调发展水平,采用面板固定效应模型和面板门... 详细信息

了解公路基础设施对城市经济和环境协调发展的影响可以为城市规划和交通建设提供理论参考。本文基于2010—2020年成渝地区双城经济圈内16个城市的面板数据,通过耦合协调模型测度经济与环境的协调发展水平,采用面板固定效应模型和面板门槛模型,研究公路基础设施对经济与环境协调发展水平的影响。结果表明:2010—2020年成渝地区双城经济圈16个城市的经济与环境协调发展水平整体呈上升趋势,重庆和成都远高于其他城市,其余协调发展水平较好的城市主要集中于“双核”周围;公路密度与城市经济和环境的协调发展水平呈正相关,人口密度为负相关,而私营经济的发展和市场化程度、科技创新能力以及教育水平等都呈正相关;长期来看,公路密度的增加对城市经济环境协调发展的促进作用依然显著,且呈现边际效用递增的趋势;当公路密度小于2.043时,对经济与环境协调发展的影响系数为0.118,而公路密度超过2.043时,影响系数则增加到0.144,说明公路密度对城市经济环境协调发展的促进作用呈现出逐渐递增的非线性特征。当地应长期重视公路基础设施的建设,积极响应国家路网建设,差异化制定投资发展规划,推动交通、经济和环境的可持续发展。

关键词：成渝地区双城经济圈公路基础设施经济与环境协调发展固定效应模型面板门槛模型

维普期刊数据库博看期刊

Hydrogen storage over alkali metal hydride and alkali metal hydroxide composites

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2014年第4期23卷 414-419页

作者： Pei Yu Yong shen Chua Hujun Cao zhitao Xiong Guotao Wu Ping Chen Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences

Alkali metal hydroxide and hydride composite systems contain both protic （H bonded with O） and hydridic hydrogen. The interaction of these two types of hydrides produces hydrogen. The enthalpy of dehydrogenation increased with the increase of atomic number of alkali metals, i.e., -23 kJ/molnz for LiOH-LiH, 55.34 kJ/moln： for NaOH-NaH and 222 kJ/molH2 for KOH-KH. These thermodynamic calculation results were consistent with our experimental results. H2 was released from LiOH-LiH system during ball milling. The dehydrogenation temperature of NaOH-NaH system was about 150 ℃; whereas KOH and KH did not interact with each other during the heating process. Instead, KH decomposed by itself. In these three systems, NaOH-NaH was the only reversible hydrogen storage system, the enthalpy of dehydrogenation was about 55.65 kJ/molHz, and the corresponding entropy was ca. 101.23 J/（molHz .K）, so the temperature for releasing 1.0 bar H2 was as high as 518 ℃, showing unfavorable thermodynamic properties. The activation energy for hydrogen desorption of NaOH-NaH was found to be 57.87 kJ/mol, showing good kinetic properties.

关键词： hydrogen storage alkali metal hydroxide alkali metal hydride thermodynamic kinetic

Sarcoid uveitis:A case report and systematic review of literature

在线全文

学校读者我要写书评

暂无评论

Advances in Ophthalmology Practice and Research 2022年第2期2卷 40-44页

作者： Junhui shen zhitao Su Lei Feng Eye Center Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhouChina Key Laboratory of Ophthalmology of Zhejiang Province HangzhouChina

*** Sarcoidosis is a disease that involves multiple systems and organs and is characterized by non-caseous necrotizing granulomas whose etiology is not fully understood.1 About 25%–80%of patients have eye and adnexal involvement.2 Uveitis,secondary glaucoma,cataracts,and macular edema are the most common complications of ocular sarcoidosis.3 Sarcoid uveitis refers to uveitis that occurs in patients with sarcoidosis and typically manifests as granulomatous anterior uveitis,posterior uveitis,or *** of sarcoid uveitis include blurred vision,eye pain,photophobia,and *** the anterior segment,iris nodules or mutton-fat keratic precipitates(KPs)are generally the most common clinical *** the vitreous cavity,the typical appearance is a snowball-like vitreous *** fundus typically manifests as peripheral chorioretinal granulomas and peripheral ***,we present a case of sarcoid uveitis with fungal endophthalmitis-like vitreitis.

关键词： uveitis granuloma involvement

Synergistic effect of the metal-support interaction and interfacial oxygen vacancy for CO_(2) hydrogenation to methanol over Ni/In_(2)O_(3) catalyst:A theoretical study

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

Journal of Energy Chemistry 2022年第2期31卷 623-629页

作者： Chenyang shen Qianqian Bao Wenjuan Xue Kaihang Sun zhitao Zhang Xinyu Jia Donghai Mei Chang-jun Liu Collaborative Innovation Center of Chemical Science&Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China State Key Laboratory of Membrane Separation and Membrane Processes School of Environmental Science and EngineeringTiangong UniversityTianjin 300387China

Indium oxide supported nickel catalyst has been experimentally confirmed to be highly active for CO_(2) hydrogenation towards *** this work,the reaction mechanism for CO_(2) hydrogenation to methanol has been investigated on a model Ni/In_(2)O_(3) catalyst,i.e.,Ni_(4)/In_(2)O_(3),via the density functional theory(DFT)*** possible reaction pathways,i.e.,the formate pathway,CO hydrogenation and the reverse water-gas-shift(RWGS)pathways,have been examined on this model *** has been demonstrated that the RWGS pathway is the most theoretically-favored for CO_(2) hydrogenation to *** complete RWGS pathway follows CO_(2)+6 H→COOH+5 H→CO+H_(2)O+4 H→HCO+H_(2)O+3 H→H_(2)CO+H_(2)O+2 H→H_(3)CO+H_(2)O+H→H_(3)COH+H_(2) ***,it has been also proved that the interfacial oxygen vacancy can serve as the active site for boosting the CO_(2) adsorption and charge transfer between the nickel species and indium oxide,which synergistically promotes the consecutive CO_(2) hydrogenation towards methanol.

关键词： CO_(2)hydrogenation Indium oxide Nickel Methanol synthesis Oxygen vacancy Density functional theory

在线全文

学校读者我要写书评

暂无评论

《功能高分子材料》教学的一点心得

山东化工 2017年第1期46卷 115-115,117页

作者：朱国全谭洪生董抒华林治涛申红望山东理工大学材料科学与工程学院山东淄博255049

《功能高分子材料》是一门高分子材料与工程专业的重要选修课,具有种类繁多、知识体系复杂、知识更新较快等特点,越来越多地引起人们的广泛关注;本文对《功能高分子材料》课程的教学内容、教学方法及考核方式等进行了改革,在教学过程中... 详细信息

《功能高分子材料》是一门高分子材料与工程专业的重要选修课,具有种类繁多、知识体系复杂、知识更新较快等特点,越来越多地引起人们的广泛关注;本文对《功能高分子材料》课程的教学内容、教学方法及考核方式等进行了改革,在教学过程中通过提高学生的学习乐趣、加强教与学的课堂互动等手段提高了教学效果。

关键词：功能高分子教学内容教学方法考核方法

Exosome-like vesicles derived by Schistosoma japonicum adult worms mediates M1 type immune- activity of macrophage

在线全文

学校读者我要写书评

暂无评论

Exosome-like vesicles derived by Schistosoma japonicum adult...

传统注射成型中流动诱导HDPE/UHMWPE共混物的取向结晶

中国动物学会寄生虫学专业委员会第十届全国寄生虫学青年工作者学术研讨会

作者： Lifu Wang zhitao Li Jia shen Zhen Liu Jinyi Liang Xiaoying Wu Xi Sun Zhongdao Wu Key Laboratory of Tropical Diseases and Control of the Ministry of Education Department of Parasitology ZhongshanS chool of Medicine Sun Yat-sen University Department of Intensive care unit The Third Affiliated Hospital Sun Yat-sen University Department of Biostatistics and Epidemiology School of Public Health Sun Yat-sen University

Background: Exosomes play an important role in intercellular signaling and exert regulatory function by carrying bioactive molecules. As numerous pathogens, adult worm of Schistosoma japonicum(S. japonicum) resides in mesenteric veins of definitive host including man and mammal animals. It was reported that the worms or the eggs also has specialize secretion systems to export effecter proteins or other molecules into host target cells. However, the mechanisms involved remained unclear. This study investigated the isolation of the exosome-like vesicles secreted by Schistosoma japonicum adult worms and its immune- activity on microphage in vitro. Methods AND Results: Exosomes are 30–100 nm membrane vesicles of endocytic origin that are released into the extracellular space upon fusion of the multi-vesicular bodies(MVB) with the plasma membrane. While initial studies described that the role of exosomes was a reticulocyte cargo-disposal mechanism allowing remodeling of the plasma membrane during the maturation of reticulocytes to erythrocytes. Recent studies indicate that exosomes are secreted by most cells and pathogens;which contain protein, nucleic acid and lipid and involved in cell– cell communication, modulating immune responses, transfer virulence factors. In this report, we identified exosome-based secretion as a new mechanism for protein secretion by S. japonicum. Electron microscopy tomography revealed the previously unidentified ultrastructural detail of exosome-like vesicles with high resolution. Exosome-like vesicles were found to be typical spherical shape and to have a diverse population that varies in size of 30–100 nm. Exosome-like vesicles isolated from S. japonicum contained a significantly different protein compare with debris pelleted and the apoptosis body. We also demonstrate that macrophages were preferentially differentiated into the M1 subtype while treated with S. japonicum exosome-like ***: This study reveals there are exosom

关键词： Exosomes Schistosoma japonicum macrophage M1

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

高分子材料科学与工程 2023年第1期39卷 85-91页

作者：胡永祥林治涛孟凡涛申红望谢邦互山东理工大学材料科学与工程学院山东淄博255100 四川大学高分子材料科学与工程学院四川成都610065

通过熔融共混将少量超高分子量聚乙烯(UHMWPE)引入到高密度聚乙烯(HDPE)中,采用高温熔融和再次剪切对共混物进行处理后,使用传统注射成型方法进行成型。采用偏光显微镜、扫描电子显微镜和二维小角X射线散射对注射成型制品中晶体的形态... 详细信息

通过熔融共混将少量超高分子量聚乙烯(UHMWPE)引入到高密度聚乙烯(HDPE)中,采用高温熔融和再次剪切对共混物进行处理后,使用传统注射成型方法进行成型。采用偏光显微镜、扫描电子显微镜和二维小角X射线散射对注射成型制品中晶体的形态结构进行了研究。发现传统注射成型(CIM)的流场可以诱导共混物形成明显的多层次晶体结构形态,在次表层存在大量的shish-kebab及互锁shish-kebab晶体结构,具有取向片晶结构的过渡层范围显著增大,而具有球晶结构的芯层范围明显缩小。表明在传统注射成型的流场下也能诱导形成丰富的取向片晶和shish-kebab结构,为注射成型制备自增强材料提供了一条新途径。

关键词：超高分子量聚乙烯高温熔融传统注射成型流动诱导取向结晶

超高分子量聚乙烯的形态对高密度聚乙烯结晶行为的影响

在线全文

学校读者我要写书评

暂无评论

高分子材料科学与工程 2020年第12期36卷 76-81页

作者：殷万儒申红望林治涛谭洪生谢邦互山东理工大学材料科学与工程学院山东淄博255100 四川大学高分子材料科学与工程学院四川成都610065

通过熔融共混制备了高密度聚乙烯/超高分子量聚乙烯(HDPE/UHMWPE)共混物,采用高温熔融和再次剪切处理改变了UHMWPE在HDPE中的分散形态,并使用非等温结晶和连续自成核退火热分级(SSA)方法研究了UHMWPE的形态变化对HDPE的结晶行为的影响... 详细信息

通过熔融共混制备了高密度聚乙烯/超高分子量聚乙烯(HDPE/UHMWPE)共混物,采用高温熔融和再次剪切处理改变了UHMWPE在HDPE中的分散形态,并使用非等温结晶和连续自成核退火热分级(SSA)方法研究了UHMWPE的形态变化对HDPE的结晶行为的影响。扫描电子显微镜图片显示,经过高温熔融和再次剪切后UHMWPE的形态发生了极大的改变,由原生粒子转变为溶胀粒子,最后粒子破碎并以更小的相畴尺寸分散在HDPE中。结晶行为表明,原生粒子促进了HDPE的结晶,但结晶完善程度只有轻微的提高;溶胀粒子则阻碍了HDPE的结晶,结晶完善程度下降;更小相畴尺寸的UHMWPE对HDPE的结晶有明显的促进作用,结晶完善程度显著提高。

关键词：超高分子量聚乙烯高温熔融连续自成核退火热分级结晶行为