检索结果-南通市图书馆

International Journal of Extreme Manufacturing 2021年第3期3卷 95-102页

作者： Bo Feng Yifang Chen duo sun Zongyao Yang Bo Yang Xue Li Tao Li Nanolithography and Application Research Group State Key Laboratory of ASIC and SystemSchool of Information Science and TechnologyFudan UniversityShanghai 200433People’s Republic of China State Key Laboratories of Transducer Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083People’s Republic of China

Polarimetric imaging enhances the ability to distinguish objects from a bright background by detecting their particular polarization status,which offers another degree of freedom in infrared remote ***,to scale up by monolithically integrating grating-based polarizers onto a focal plane array(FPA)of infrared detectors,fundamental technical obstacles must be overcome,including reductions of the extinction ratio by the misalignment between the polarizer and the detector,grating line width fluctuations,the line edge roughness,*** paper reports the authors’latest achievements in overcoming those problems by solving key technical issues regarding the integration of large-scale polarizers onto the chips of FPAs with individual indium gallium arsenide/indium phosphide(In Ga As/In P)sensors as the basic building *** and photovoltaic chips with divisions of the focal plane of 540×4 pixels and 320×256 superpixels have been successfully *** imaging with enhanced contrast has been *** progress made in this work has opened up a broad avenue toward industrialization of high quality polarimetric imaging in infrared wavelengths.

关键词： polarimetric imaging grating based polarizer InGaAs/InP focal plane array nanofabrication

Microstructural evolution and mechanical properties of an Fe–18Ni–16Cr–4Al base alloy during aging at 950°C

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第3期23卷 314-322页

作者： Man Wang Yong-duo sun Jing-kai Feng Rui-qian Zhang Rui Tang Zhang-jian Zhou School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China

The development of Gen-IV nuclear systems and ultra-supercritical power plants proposes greater demands on structural materials used for key components. An Fe-18Ni-16Cr-4Al（316-base） alumina-forming austenitic steel was developed in our laboratory. Its micro- structural evolution and mechanical properties during aging at 950℃were investigated subsequently. Microstructural changes were charac- terized by scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. Needle-shaped NiAI parti- cles begin to precipitate in austenite after ageing for 10 h, whereas round NiA1 particles in ferrite are coarsened during aging. Precipitates of NiAI with different shapes in different matrices result from differences in lattice misfits. The tensile plasticity increases by 32.4% after aging because of the improvement in the percentage of coincidence site lattice grain boundaries, whereas the tensile strength remains relatively high at approximately 790 MPa.

关键词： austenitic steel alumina aging precipitates mechanical properties microstructural evolution nuclear power plants

Synthesis of protected (2S,4R)-2-amino-4-methyldecanoic acid, a proposed component of culicinins

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第9期19卷 1068-1070页

作者： Wei Zhang Tian Tian sun duo Mei Jun Fei Wang Ying Xia Li Key laboratory of Marine Drugs The Ministry of Education of China School of Pharmacy Ocean University of China Qingdao 266003 China

The protected （2S,4R）-2-amino-4-methyldecanoic acid, a proposed component of culicinins has been synthesized over 10 steps and in total 28% yields using Wittig reaction and Schollkopf amino acid synthesis as key steps.

关键词： Synthesis Amino acid Schollkopf methodology Culicinins

Preparation, Properties and Mechanism of Inhomogeneous Calcium Alginate Ion Cross-linking Gel Microspheres

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2003年第1期19卷 85-88页

作者： CHEN Yi qing sun duo xian LIU Jun HUANG Ya qing School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072P.R.China

Inhomogeneous calcium alginate ion cross\|linking gel microspheres, a novel ion absorbent, were prepared by dropping a sodium alginate solution to a calcium chloride solution via an electronic droplet generator. Calcium alginate microspheres have uniform particle sizes, a smooth surface and a microporous structure. The electrode probe reveals the inhomogeneous distribution of calcium ions with the highest concentration on the surface, and the lowest concentration in the cores of the spheres. As a novel ion adsorbent, calcium alginate gel microspheres have a lower limiting adsorption mass concentration, a higher enrichment capacity and a higher adsorption capacity for Pb 2+ than usual ion exchange resins. The highest percentage of the adsorption is 99 79%. The limiting adsorption mass concentration is 0 0426 mg/L. The adsorption capacity for Pb 2+ is 644 mg/g. Calcium alginate gel microspheres have a much faster ion exchange velocity than D418 chelating resin and D113 polyacrylate resin. The moving boundary model was employed to interpret the ion exchange kinetics process, which indicates that the ion exchange process is controlled by intraparticle diffusion of adsorbable ions. So the formation of inhomogeneous gel microspheres reduces the diffusion distance of adsorbable ions within the spheres and enhances the ion exchange velocity. Alginate has a higher selectivity for Pb 2+ than for Ca 2+ and the selectivity coefficient K Pb Ca is 316. As an ion cross\|linking gel, calcium alginate inhomogeneous microspheres can effectively adsorb heavy metal Pb 2+ at a higher selectivity and a higher adsorption velocity. It is a novel and good ion adsorbent.

关键词： Alginate Inhomogeneous microsphere Adsorption Mechanism

六轮摇臂式月球探测车协调驱动自适应模糊容错控制

在线全文

学校读者我要写书评

暂无评论

宇航学报 2012年第1期33卷 76-84页

作者：孙多青河北科技师范学院数学与系统科学研究所秦皇岛066004 北京控制工程研究所空间智能控制技术重点实验室北京100190

为提高复杂和未知环境中六轮摇臂式月球探测车的驱动控制系统的可靠性,防止因执行器故障引起的月球车失控,提出一种基于滑转率的协调驱动自适应模糊容错控制方法。该方法用模糊逻辑系统逼近系统的未知动态和未知的故障函数,并通过所设... 详细信息

为提高复杂和未知环境中六轮摇臂式月球探测车的驱动控制系统的可靠性,防止因执行器故障引起的月球车失控,提出一种基于滑转率的协调驱动自适应模糊容错控制方法。该方法用模糊逻辑系统逼近系统的未知动态和未知的故障函数,并通过所设计的误差补偿器来减少逼近误差对跟踪精度的影响。基于Lyapunov理论,证明了所设计的容错控制方案不但能使跟踪误差收敛到原点的小邻域内,而且通过适当增大设计参数的值,可使跟踪误差减小。此外,为便于应用给出了详细的容错控制器设计步骤,并对控制器中参数的选取给出了示例。仿真结果表明该控制律具有较高的控制精度,并且对外部干扰有很强的鲁棒性。

关键词：月球探测车容错控制驱动控制模糊控制滑转率机器人

分层模糊广义预测控制及其在挠性航天器振动抑制中的应用

在线全文

学校读者我要写书评

暂无评论

宇航学报 2009年第4期30卷 1537-1543页

作者：孙多青河北科技师范学院数理系秦皇岛066004 中国空间技术研究院北京控制工程研究所北京100080

针对广义预测控制计算量大的缺陷,将自适应分层模糊逻辑系统(HFLS)引入广义预测控制,对参数未知线性系统提出一种直接自适应分层模糊广义预测控制方法。该方法直接利用HFLS设计广义预测控制器,并基于广义误差估计值对控制器参数和广义... 详细信息

针对广义预测控制计算量大的缺陷,将自适应分层模糊逻辑系统(HFLS)引入广义预测控制,对参数未知线性系统提出一种直接自适应分层模糊广义预测控制方法。该方法直接利用HFLS设计广义预测控制器,并基于广义误差估计值对控制器参数和广义误差估计值中的未知向量进行自适应调整。文中证明了该方法可使广义误差收敛到原点的一个小领域内。由于控制结构中使用了HFLS,避免了模糊控制器中规则数目随系统变量个数呈指数增长问题。仿真结果表明:该方法能快速抑制挠性航天器的低频振动且稳态精度高。

关键词：参数未知线性系统分层模糊系统广义预测控制自适应控制稳定性航天器

Hot deformation behavior and microstructure features of FeCrAl-ODS alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第9期29卷 1455-1463页

作者： Di-jun Long Shao-yu Qiu Wen-bo Liu Yong-duo sun Wei Luo Hui-qun Liu Rui-qian Zhang Nuclear Power Institute of China Chengdu 610213SichuanChina School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina

The hot deformation behavior of FeCrAl-ODS alloys at temperatures of 1050-1200℃ and strain rates of 0.001-1 s^(-1),*** peak stress of FeCrAl-ODS alloy during hot deformation decreased with increasing temperature and decreasing strain *** addition,the stress-strain curves show a dynamic softening phenomenon according to the shape of the flow *** on the Arrhenius-type model,a constitutive equation and processing map of FeCrAl-ODS alloy were ***,we proposed optimum processing parameters of 1200℃ and 0.001 s^(-1)based on the processing *** with FeCrAl alloys,there was no significant phenomenon of grain coarsening during hot deformation in FeCrAl-ODS *** the electron backscattered diffraction images,both recrystallized and recovered grains were observed in the matrix under dfferent deformation *** fraction of dynamically recrystallized grains in the matrix under the deformation of 1100 C/0.001 s^(-1)(42.5%)was significantly higher than that at 1200℃/0.001 s^(-1)(10.6%),which was consistent with the stress-strain curves.

关键词： FeCrAl-ODS steel Oxide dispersion strengthening High-temperature deformation Processing map

THE SYNTHESIS AND CHARACTERIZATION OF ANSYMMETRIC PENTAAZADENTATE PORPHYRIN-LIKE METAL COMPLEXES

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

Chinese Chemical Letters 1993年第3期4卷 225-228页

作者： Wen Fang sun duo Yuan WANG Institute of Photographic Chemistry,Beijing,100101

This paper presents the synthesis and structural characterization of asymmetric tripyrrane-containing *** macrocycle could be oxidized to the methine bridged,22 π-electron aromatic macrocyclic complexes containing cadmium(Ⅱ),samarium (Ⅲ),europium(Ⅲ)and gadolinium(Ⅲ)by treating with corresponding metal chloride in the presence of air Their structures were characterized by spectral methods.

关键词： Wang THE SYNTHESIS AND CHARACTERIZATION OF ANSYMMETRIC PENTAAZADENTATE PORPHYRIN-LIKE METAL COMPLEXES

Research of Trap and Electron Density Distributions in the Interface of Polyimide/Al2O3 Nanocomposite Films Based on IDC and SAXS

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2017年第4期34卷 116-119页

作者： Yuan-Yuan Liu Jing-Hua Yin Xiao-Xu Liu duo sun Ming-Hua Chen Zhong-Hua Wu Bo Su Key Laboratory of Engineering Dielectric and Its Applications (Ministry of Education) Harbin University of Science and Technology Harbin 150080 Harbin Cambridge College Harbin 150069 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049

The distributions of traps and electron density in the interfaces between polyimide （PI） matrix and Al2O3 nanoparticles are researched using the isothermal decay current and the small-angle x-ray scattering （SAXS） tests. According to the electron density distribution for quasi two-phase mixture doped by spherical nanoparticles, the electron densities in the interfaces of PI/Al2O3 nanocomposite films are evaluated. The trap level density and carrier mobility in the interface are studied. The experimental results show that the distribution and the change rate of the electron density in the three layers of interface are different, indicating different trap distributions in the interface layers. There is a maximum trap level density in the second layer, where the maximum trap level density for the nanocomposite film doped by 25 wt% is 1.054 × 10^22 eV·m^-3 at 1.324eV, resulting in the carrier mobility reducing. In addition, both the thickness and the electron density of the nanocomposite film interface increase with the addition of the doped Al2O3 contents. Through the study on the trap level distribution in the interface, it is possible to further analyze the insulation mechanism and to improve the performance of nano-dielectric materials.

关键词： AI PI Research of Trap and Electron Density Distributions in the Interface of Polyimide/Al2O3 Nanocomposite Films Based on IDC and SAXS IDC Al

Clinical Study of the Therapeutic Effectsof Rhubarb as A Main Drug in the Treatment of Chronic Renal Failure

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 1995年第1期1卷 104-107页

作者： Ye Ren-gao (叶任高) Li Yan-chun(李彦春) and sun duo (孙铎) (National institute of Kidney, sun Yat-sen University of Medical Sciences, Guangzhou) (510080) National Institute of Kidney Sun Yat-sen University of Medical Sciences Guangzhou

To seek an effective treatment to delay the development of chronic renal failure, the au-thors studied the effects of a therapy integrating Chinese and Western medicine with rhubarb as the maindrug. Sixty hospitalized patients were divided into an integrated Chinese and Western medicine therapygroup (test group, 30 cases) and a Western therapy group (control group, 30 cases) . There were no dif-ferences in age, sex, underlying diseases and renal function of the two groups. The patients in bothgroups were treated for three weeks as a therapy course. The results show the levels of blood urea nitro-gen and serum creatinine after treatment were higher than before treatment in the control group, but lowerin the test group. The value of reciprocal coefficient (slope or b value) relationship between inverseserum creatinine slope and time in the control group was -1.198 3. 931, but the slope(b value) in thetest group was 0. 125 2. 252. There were no side-effects to be found in either group. The study suggeststhat integrated Chinese and Western medicine using rhubarb as a main drug can delay renal function dete-rioration and improve renal function in some cases.

关键词： chronic renal failure rhubarb treatment