中国科学院机构知识库网格系统: 检索

Effect of manganese oxides on arsenic speciation and mobilization in different arsenic-adsorbed iron-minerals under microbially-reducing conditions 期刊论文 OAI收割
JOURNAL OF HAZARDOUS MATERIALS, 2023, 卷号: 445, 期号: 0, 页码: 130602-1-11
作者: Liu, Xiaotong

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收藏 | 浏览/下载：33/0 | 提交时间：2023/02/06

Manganese oxides As(V)-reducing bacteria Arsenic speciation transformation Arsenic redistribution

丛枝菌根增强植物砷抗性生理机制研究 学位论文 OAI收割
北京: 中国科学院生态环境研究中心, 2018
作者: 李景龙

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收藏 | 浏览/下载：87/0 | 提交时间：2019/07/05

丛枝菌根共生体,砷抗性,积累分配,形态转化,基因表达 Arbuscular Mycorrhizal Symbiosis,As Resistance,Accumulation And Translocation,Transformation,Gene Expression

Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions 期刊论文 OAI收割
CHEMICAL GEOLOGY, 2015, 卷号: 407, 页码: 46-53
作者: Jia, Yongfeng; Xiao, Fan; Wang, Shaofeng; Xu, Liying; Wang, Ying

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收藏 | 浏览/下载：34/0 | 提交时间：2019/06/04

Monothioarsenate As Transformation Xas Ftir Acid-catalyzed Reduction

Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions 期刊论文 iSwitch采集
Chemical geology, 2015, 卷号: 407, 页码: 46-53
作者: Xiao, Fan; Wang, Shaofeng; Xu, Liying; Wang, Ying; Yuan, Zidan

收藏 | 浏览/下载：27/0 | 提交时间：2019/05/10

Monothioarsenate As transformation Xas Ftir Acid-catalyzed reduction

Microbial transformation of 20(S)-protopanaxadiol by Absidia corymbifera. Cytotoxic activity of the metabolites against human prostate cancer cells 期刊论文 OAI收割
FITOTERAPIA, 2013, 卷号: 84, 页码: 6-10
作者: Chen, Guangtong; Yang, Min; Nong, Shaojun; Yang, Xue; Ling, Yong

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收藏 | 浏览/下载：30/0 | 提交时间：2019/01/08

Microbial transformation Absidia corymbifera AS 3.3387 20(S)-Protopanaxadiol Dehydrogenation Hydroxylation Cytotoxic activity

Evaluation of spatial upscaling methods based on remote sensing data with multiple spatial resolutions (EI CONFERENCE) 会议论文 OAI收割
Satellite Data Compression, Communications, and Processing VIII, August 12, 2012 - August 13, 2012, San Diego, CA, United states
Ren R.; Gu L.; Cao J.; Chen H.; Sun J.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

In most applications of remote sensing data special spatial information is required from a finer to a coarser spatial resolution with appropriate upscaling methods. The purpose of this paper is to compare and evaluate current spatial upscaling methods using MODIS remote sensing data with multiple spatial resolutions. In the research Northeast China was selected as the study area. MODIS data with spatial resolutions of 250 m (2 bands) and 500 m (7 bands) were used as the test data. Through using the selected upscaling methods the Band 1 and Band 2 data of MODIS were scaled up from 250 m to 500 m spatial resolution. On the basis of land cover characteristics of Northeast China the MODIS data located in the study area was classified into the five land cover types including water grasslands forests farmlands and bare lands using maximum likelihood method. The land cover classification results were further compared with MODIS Land Cover Type product. Finally Structural Similarity (SSIM) was selected to evaluate the effects of these upscaling methods. The research can provide more useful information for spatial scaling transformation in remote sensing data applications. 2012 SPIE.

Space camera dynamic image quality measurement and evaluation (EI CONFERENCE) 会议论文 OAI收割
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

By using analysis of the infinity image of the space camera we intend to obtain the curve of the dynamic modulation transfer function. We extract the pixel gray values at the image edge which distribute as a knife-edge function and make differential calculation and Fourier transformation of it and then we can obtain the dynamic MTF curve of the optical system. The value of the curve at the Nyquist frequency is the most important parameter that reflects the image quality. We add push-scanning imaging and environmental effects to the static MTF of space camera and compare the MTF value with the dynamic MTF at Nyquist frequency. The comparison result can help us verify the accuracy of the calculating results and the feasibility of our method. (2011) Trans Tech Publications.

Research on computer control strategy for optical electric tracking system (EI CONFERENCE) 会议论文 OAI收割
2011 IEEE International Conference on Mechatronics and Automation, ICMA 2011, August 7, 2011 - August 10, 2011, Beijing, China
作者: Li M.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

In this paper mathematic model and computer control strategy for optical electrical tracking system have been researched and discussed. First the system's structure and its work process have been analyzed. Second according to the system's moving law the system's mathematic model has been built. As to the computer control strategy trigger guiding two closed loop PID control method as well as compound control method have been applied to satisfy the tracking accuracy. Third we apply the bilinear transformation to get the digital system and the sample time is 800Hz. The simulation results indicate that the maximum tracking error can be limited to less than 0.5 and the regulator time can be 0.04s. Then the control project resonance frequency should be more than 200Hz and the sample frequency should be more than 400Hz to meet the control accuracy requirement. So we can conclude that the system indexes such as swiftness high accuracy as long as real time have been satisfied. And the requirement of mechanical property has been present which is very useful to mechanical working. 2011 IEEE.

A small thickness measurement system based on PSD and FPGA (EI CONFERENCE) 会议论文 OAI收割
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
作者: Guo J.; Guo J.; He X.

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Considering that the requirement of industrial manufacture An AT89S51 singlechip works as the core processor of the system. By two laser triangulation a small thickness measurement system based on PSD and FPGA is presented. It takes S3931 PSD of one dimension as position detection device A FPGA produces logic control signals for the whole system the small displacement is converted to differential voltages which is made by Hamamatsu in Japan and after amplification and A/D transformation 8-bit parallel data is send to singlechip from FPGA by external interrupts and the final calculation results output to the LCD display module. After digital micro meter calibration we get the small thickness. Experiments show that the detection accuracy of the system is not less than 10um.

Optical axis stabilization of semi-strapdown seeker based on disturbance observer (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Information and Automation, ICIA 2011, June 6, 2011 - June 8, 2011, Shenzhen, China
Sun G.; Zhu M.; Yin S.; Jia H.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

Based on the kinematics of semi-strapdown seeker the framework coordinate of the seeker is established. The optical axis stability equation of semi-strapdown seeker is deduced by using attitude transformation matrix. Then the stability control principle block diagram of semi-strapdown seeker is shown based on the stability equation. The main factors that influence the stabilization precision are pointed out such as friction disturbance velocity-measuring noise and missile disturbance. In order to improve the stabilization precision disturbance observer was proposed in semi-strapdown seeker stability control. The low frequency external disturbance and high frequency velocity measurement noise are effectively restrained by the disturbance observer as shown in hardware-in-loop simulation and optical axis stabilization precision is improved nearly 20 times and 5 times due to two different frequencies with same amplitude. 2011 IEEE.