中国科学院机构知识库网格系统: 检索

Diverse antibiotic resistance genes and potential pathogens inhabit in the phyllosphere of fresh vegetables 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2022, 卷号: 815, 期号: 0, 页码: 152851
作者: Yin, Yue; Zhu, Dong; Yang, Guang; Su, Jianqiang; Duan, Guilan

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收藏 | 浏览/下载：9/0 | 提交时间：2022/11/07

ESCHERICHIA-COLI IRRIGATION WATER CROSS-CONTAMINATION SALMONELLA BACTERIA PRODUCE RISK COMMUNITIES RESISTOME SURVIVAL

Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文 OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者: HXMT

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收藏 | 浏览/下载：16/0 | 提交时间：2022/02/08

Radio transient sources Magnetars Soft gamma-ray repeaters 2008 992 1471 Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of A_J = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 10¹⁴ Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to R_NIR ? 0.025 (fluence index ?0.35).

Methane Decomposition Kinetics over Fe2O3 Catalyst in Micro Fluidized Bed Reaction Analyzer 期刊论文 OAI收割
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2018, 卷号: 57, 期号: 25, 页码: 8413, 8423
作者: Geng, SL; Han, ZN; Hu, Y; Cui, YB; Yue, JR

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收藏 | 浏览/下载：31/0 | 提交时间：2018/12/29

COX-FREE HYDROGEN MULTIWALLED CARBON NANOTUBES NATURAL-GAS DECOMPOSITION THERMAL-DECOMPOSITION ALUMINA CATALYSTS PRODUCE HYDROGEN NICKEL-CATALYSTS NI DEACTIVATION NANOFIBERS

烟台夹河口外柱状沉积物还原性无机硫、活性铁的变化特征及其相互关系 期刊论文 OAI收割
海洋科学, 2018, 卷号: 42, 期号: 8, 页码: 90-97
作者: 姜明; 赵国强; 李兆冉; 盛彦清

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收藏 | 浏览/下载：15/0 | 提交时间：2020/07/08

还原性无机硫活性铁深层柱状沉积物硫化度矿化度 Reduced inorganic sulfur Reactive iron Deep core sediments Degree of pyritization Degree of sulfidity The distribution characteristics and coupling mechanism of reduced inorganic sulfur (RIS)and reactive iron in marine core sediments are closely related to the evolution of environment quality.In this study,an improved cold diffusion method and hydrochloric acid extraction method were applied to the acid-volatile sulfur (AVS),pyrite sulfur (CRS),elemental sulfur (ES),and reactive iron [Fe (Ⅱ)and Fe (III)] analyses.The distribution characteristics and coupling mechanism of S and Fe were investigated based on a core sediment 4 meters deep collected in the northern sea area of the mouth of Jiahe River,Yantai.The results showed that the RIS in sediments was dominated by CRS,followed by AVS and ES.The content of AVS presented a narrow range with depth,whereas the CRS and ES were higher at the top and bottom layers than the middle layer reactive iron was dominated by Fe (II),which increased with depth,while Fe (Ⅲ)gradually decreased with depth.Most of the Fe (III)was reduced to the disssolved Fe(II),which was combined with the soluble H_2S of the sulfate-reducing bacteria to produce CRS and ES in the deep layer,resulting in their accumulation at the bottom of core sediments.Furthermore,this study showed that reactive iron was not a limiting factor for the accumulation of RIS with lower degree of pyritization and degree of sulfidity.

Strong magnetic fields generated with a metal wire irradiated by high power laser pulses and its effect on bow shock 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2017, 卷号: 66, 期号: 9
作者: Li Yan-Fei; Li Yu-Tong; Zhu Bao-Jun; Yuan Da-Wei; Li Fang

收藏 | 浏览/下载：38/0 | 提交时间：2017/09/01

high power laser produce of strong magnetic fields bow shock magnetized plasma

A Shop Floor Control System Structure for Fast Configuration 会议论文 OAI收割
Jinan, China, October 20-22, 2017
作者: Zeng P(曾鹏); Wan GX(万广喜)

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收藏 | 浏览/下载：13/0 | 提交时间：2018/06/19

Manufacturing Systems Reconfigurable Manufacturing System Iec 61499 Plug And Produce Method Shop Floor Control System

基于复杂网络的农产品期市行为模型研究 学位论文 OAI收割
工学硕士, 中国科学院自动化研究所: 中国科学院大学, 2013
潘建禄

收藏 | 浏览/下载：58/0 | 提交时间：2015/09/02

复杂网络农产品期市多Agent系统羊群行为 Complex Network Produce Future Market Multi-agent System Herd Behavior

Technology on fabrication of precise SiC aspherical mirror (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Materials and Products Manufacturing Technology, ICMPMT 2011, October 28, 2011 - October 30, 2011, Chengdu, China
Zhang Z.

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This paper represents a technique to produce the large size optical aspherical mirror by using reaction-bonded silicon carbide to meet the material requirements of the space used mirrors based on the characters comparison of all types mirror material. Techniques are described in this paper including the bonding procedure of silicon carbide to form a mirror shape the CCOM technology for aspheric grinding polishing on a home-developed tool -FSGJ-2 and the aspheric profilometry. A specialized Offner Null lens is also developed to measure the aspherical mirror with laser interferometer. With the technology depicted in the paper a 502mm 298 mm off-axis SiC aspherical mirror is successfully made with a surface accuracy better than 1/50rms the final result meets the design requirement. (2011) Trans Tech Publications.

Contact-impact analys with clearance hinge in flexible multi-body system (EI CONFERENCE) 会议论文 OAI收割
2nd Annual Conference on Electrical and Control Engineering, ICECE 2011, September 16, 2011 - September 18, 2011, Yichang, China
Ge M.; Jia H.; Liu B.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

Hinge in mechanical systems exist small clearance and contact deformation After consideration of flexible components cause the system to the wear and tear impact force reduced at the clearance noise contact time increased vibration contact-impact areas expand and clearance also caused disturbance of the rod angular velocity of the linkage. 2011 IEEE. reliability reduce or even failure[1]. Therefore the hinge clearance and the impact of flexible components in kinetic models should be considered. In this paper a nonlinear spring-damper hinge clearance model is considered to establish mechanical system structure of dynamic equations[46] through a four-bar linkage hinge with multi-clearance rotation of ADAMS dynamic simulation for dynamics simulation study. Simulation results show that hinge clearance and link flexible in Four-link mechanism dynamics have a great impact on performance: connection with the clearance lead to pin holes to produce a series of collisions and a larger initial impact force

Design of transmission of high-speed CCD driving signals (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011, August 19, 2011 - August 22, 2011, Jilin, China
作者: Zhang S.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

In order to overcome the distortion problem of CCD driving signals caused by signal transmission the detail implementation of transmission of high-speed CCD driving signals based on transmission line theory is discussed. The CCD driving signals are critical to the CCD to produce high quality images. In high speed application these drivers will occupy more circuit board areas and can not be put very close to the CCD. So the driving signals must be transmitted. Because the CCD exhibits capacitive load the driving signals distortion problem is much severe. Transmission line theory is used to analyze the problem. The method of source termination is adopted to avoid signal reflections. Meanwhile the characteristic impedance of the circuit board and the resistance of terminal resistor are designed small enough to decrease the rising and falling time of the driving signals. Experimental results show that there is no distortion of the high speed driving signals after transmission. 2011 IEEE.