中国科学院机构知识库网格系统: 检索

Simulated effects of vegetation increase/decrease on temperature changes from 1982 to 2000 across the Eastern China SCI/SSCI论文 OAI收割
2014
Ge Q. S.; Zhang X. Z.; Zheng J. Y.

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cooling effects Eastern China temperature changes vegetation increase decrease land-use interannual variations climate feedbacks index cover sensitivity fraction impacts model retrievals

Experimental study on Jet-A pool fire at high altitude 会议论文 OAI收割
11th International Symposium on Fire Safety Science, FSS 2014, Canterbury, New zealand, February 10, 2014 - February 14, 2014
作者: Zhou ZH; Yao W(姚卫); Li HH; Lin CH; Yin J

收藏 | 浏览/下载：31/0 | 提交时间：2017/05/27

Ambient pressures Flame temperatures High altitude Insulation board Mass burning rate Performance standards Pool fires Temperature decrease

Tribological properties of Mos2 thin coatings under liquid lubricating (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Innovation Manufacturing and Engineering Management, IMEM 2012, December 14, 2012 - December 16, 2012, Chongqing, China
Bai Y.; Cao P.

收藏 | 浏览/下载：33/0 | 提交时间：2013/03/25

The objective of this study is to investigate the effect of solid and liquid lubrication on friction and wear performance of selected solid lubricating coatings comparative experiments have been carried out on magnetron sputtered MoS2 coatings against Si3N4 ball using a ball-on-disk tribo-tester under the conditions of room temperature and different lubrication. Surface morphology of coatings were investigated by atom force microscope (AFM) and friction coefficient (COF) and wear rate of solid films were also be analyzed. It was shown that the friction is greatly reduced when the solid film is lubricated with oil and grease simultaneously in comparison with single-lubricant lubrication at the start-up or under boundary lubrication conditions. Liquid lubrication causes a dramatic decrease of the wear-ability of the MoS2 coatings. The effect of oil lubrication to the deterioration of wear resistance of MoS2 film was even worse than lubrication grease. (2013) Trans Tech Publications Switzerland.

Influence of high temperature annealing in nitrogen on upconversion luminescence of -NaYF4: Yb3+, Er3+ hexagonal sub-microplates (EI CONFERENCE) 会议论文 OAI收割
2012 International conference on Function Materials and Nanotechnology, FMN 2012, May 19, 2012 - May 20, 2012, Zhengzhou, China
作者: Zhao J.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

The pure -NaYF4: Yb3+ Er3+ hexagonal sub-microplates were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. The size of them is about 600 nm 400 nm (side length thickness). The obtained sample was divided into two parts and one of them was annealed in nitrogen at 300 C for 2 hours. The crystal structure of the -NaYF4: Yb3+ Er3+ hexagonal sub-microplates before and after annealing treatment is hexagonal phase. Under the excitation of 980 nm diode laser the upconversion luminescence intensity the sample after annealing is much stronger than that of the sample without annealing treatment. High temperature annealing process improved the crystallization of the sample resulting in the decrease of the nonradiative relaxation and the enhancement of the upconversion luminescence. (2012) Trans Tech Publications Switzerland.

The application of diagnostic equipment in the Tokamak fusion reaction (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, November 6, 2011 - November 9, 2011, Beijing, China
Zhang B.-S.; Chang J.; Gong X.-Z.; Gan J.-F.; Feng S.-L.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

This paper introduces the infrared optical system in the Tokamak fusion reaction device. In this optical system 3.the relay group lenses. This paper describes the decrease of the modulation transfer function (MTF) when the temperature changes and how to compensate the decrease of the MTF in order to maintain the image quality in a high level. As a result the traditional optical structure can't meet the requirements 2.the Cassegrain system the image quality of this optical system can reach the requirements when the temperature changes. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE). because the length of the infrared optical system in the Tokamak is very long. The design of optical system in the detection facility includes three parts:1.the combination of the concave aspheric mirror and flat mirror

Thermal-structure analysis of supersonic dome based on three materials (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Jiang Z.; Ai X.; Wei Q.; Liu B.; Jia H.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

To a supersonic missile a seeker could enhance the aerodynamic ability due to decrease the resistance in flying. At the same time the primary function of a seeker has been considered as the most important equipment for a missile due to the importance for cueing of targets and tracking for the final approach. However the dome of a seeker which is made up of glass has poor mechanical performance. Especially in the higher altitude for a dome in which the aerothermal and pressure loads could destroy the structure easily it is necessary to do the thermal-structure coupled analysis due to varied materials. In the paper to take the spherical dome of a seeker as a example the analysis has been completed according to the varied materials consist of MgF2 Al2O3 and ZnS. The temperature loads and the pressure loads derived from the results of fluent analysis has been forced on the surface of dome which simulates the actual Mach 2.5 in flying. According to the results of coupled analysis the SEQV stress of the dome radium 80mm based on three materials had reached to 31MPa which shows that the strength is sufficient for Mach 2.5 and offered the warranty to design the attaching to missile for the dome. At the same time the results required the flexible mounting for the dome due to the displacements results which the crystal material couldn't accept. 2011 IEEE.

Electron transport in polymer-derived amorphous silicon oxycarbonitride ceramics (EI CONFERENCE) 会议论文 OAI收割
作者: Zhang L.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：65/0 | 提交时间：2013/03/25

The electron transport behavior of polymer-derived amorphous silicon oxycarbonitride ceramics is studied by measuring their temperature-dependent electrical conductivities. The experimental results are analyzed using theoretical models. The results reveal that the materials exhibit three conduction mechanisms: conduction in extended states conduction in band tails and conduction in localized states. Particularly it is found that in a low-temperature regime the conduction of the materials follows a band tail hopping mechanism rather than the previously assumed variable range hopping mechanism. The results also reveal that energy gaps such as EC-E F and EC-EA decrease with increasing pyrolysis temperature. 2009 The American Ceramic Society.

Regional summer temperature decrease against global warming in China, landform effect? 期刊论文 iSwitch采集
JOURNAL OF MOUNTAIN SCIENCE, 2007, 卷号: 4, 期号: 1, 页码: 86-90
作者: Lu Aigang; Pang Deqian; He Yuanqing; Pang Hongxi; Wang Tianming

收藏 | 浏览/下载：11/0 | 提交时间：2019/10/08

isotherm structure seasonal variation summer temperature decrease plateau-basin effect China

Spontaneous emission and gain characteristics of InGaAs/InGaAsP quantum well laser (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Devices and Integration, November 8, 2004 - November 11, 2004, Beijing, China
作者: Wang L.; Wang L.; Wang L.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

Long wavelength InGaAs/InGaAsP multiple quantum well laser is grown by MOCVD. The characteristics of spontaneous emission amplified spontaneous emission and modal gain of the MQW is investigated by using single-pass multi-section technique. The amplified spontaneous emission is around a wavelength of 1500nm dependent on the temperature and the current density. The modal gain spectra show a red shift with increasing temperature. The peak modal gain exhibits a decrease with increasing temperature from 140K to 300K. The loss measurements shows that the main loss mechanism in the structure might be the free carrier absorption in the doped cladding layers and a internal modal loss of about 10cm-1.

An LCoS microdisplay with new frame buffer pixel circuits (EI CONFERENCE) 会议论文 OAI收割
Second Americas Display Engineering and Applications Conference, ADEAC 2005, October 25, 2005 - October 27, 2005, Portland, OR, United states
Song Y.; Ling Z.

收藏 | 浏览/下载：15/0 | 提交时间：2013/03/25

In this paper we proposed novel frame buffer pixel circuits for LCoS microdisplays. The new pixel circuits were simulated and compared with others by SPICE. They can decrease the leakage current by minimizing the amount of transistors connecting with the pixel electrode in the voltage-holding period. And the PMOS charge-clear transistor is introduced firstly to simplify Interconnects of active matrix silicon backplane. The new pixel circuits have the advantages of high resistance to EMI high voltage holding ratio under high Illumination and high temperature variance less flick and simple Interconnects.