作者机构：
Changsha Univ. of Science and Technology (China)
会议名称：
Sixth Symposium on Novel Optoelectronic Detection Technology and Applications
会议时间：
Beijing, China
会议论文集名称：
Sixth Symposium on Novel Optoelectronic Detection Technology and Applications
摘要：
The detection of external vibration with optical pulses is the discrete sampling in phase-sensitive OTDR. In this paper, the continuous measurement of distributed vibration based on the phase-sensitive OTDR is demonstrated. The synchronized optical signal consisting of narrow optical pulses and the background light is injected into the sensing fiber as probe light. The time-resolved disturbance is continuously recorded by the background optical signal. The detectable frequency response range and the accuracy of the signal reconstruction are improved. The Rayleigh backscattering light generated by the background optical signal interferes at the detection end, presenting an enhanced sensitivity to external vibrations. The Rayleigh backscattering of narrow pulses is tracked to locate vibrations. The system can realize continuous measurement of distributed vibration with enhanced frequency response range and sensitivity.
摘要：
Based on the principle of forced convection heat transfer in a single tube with air transverse sweep, an experimental device of forced convection heat transfer with equilibrium point tracking was developed. The device controls wind speed, heating power and other experimental working parameters by MCU, synchronously adjusting, collecting and analyzing working parameters in real time, to realize the tracking of thermal balance point. Newton cooling formula and criterion relation are adopted to calculate Nusselt number and Reynolds number automatically, to fit criterion relation and to display correlation curve automatically, and to realize automatic data analysis. The test results show that the experimental results are in good agreement with the empirical correlation formula within the Reynolds number range of 40 similar to 4000, which realizes the automatic tracking of thermal equilibrium point and meets the requirements of real-time automatic measurement in forced convection heat transfer experiment.
期刊：
Communications in Computer and Information Science,2020年1267:142-151 ISSN：1865-0929
通讯作者：
Xu, Z.
作者机构：
[Xu Z.; Li F.] Computer and Communication Engineer Institute, Changsha University of Science and Technology, Changsha, Hunan 410114, China;[Tan M.] Big data development and Research Center, Guangzhou College of Technology and Business, Guangzhou, 528138, China;[Zhang J.] School of Computer Science, Hubei University of Technology, Wuhan, Hubei 430068, China
通讯机构：
[Xu, Z.] C;Computer and Communication Engineer Institute, China
会议名称：
2nd International Conference on Blockchain and Trustworthy Systems, Blocksys 2020
摘要：
To understand the prospects of rubber-modified and polymer-modified asphaltic materials, pavement engineers must have a proper knowledge of the physical mechanisms of polymer materials in asphalt binder so that asphalt materials reflect the various rheological properties and pavement distresses along the wide range of testing conditions. Accordingly, the study reported here is aimed to present a mechanistic investigation on characteristics of rubber-modified and polymer-modified asphalt binders based on the evaluation of various rheological properties and primary modes of failure (i.e. low-temperature cracking, rutting and fatigue cracking in this study). In this experimental work, crumb rubber (hereinafter referred to as rubber), styrene-butadiene styrene (SBS), and ethylene-vinyl acetate (EVA), were introduced individually to the asphalt binder at different rates to prepare the blends. The physical and mechanical characteristics of the modified asphalt binders were discussed in the light of rotational viscosity (before and after aging), linear and nonlinear rheological measurements, rutting susceptibility, fatigue cracking, and relaxation modulus. Susceptibility to low-temperature cracking also was analyzed for all possible aging states. The results revealed that the viscosity of modified asphalt binders (using rubber, SBS, and EVA) is highly dependent on the aging state and the additive type and the content. The modified binders are able to allow good stress relaxation and better resistance to low-temperature cracking (even after short- and long-term aging), rutting, and fatigue cracking. Interestingly, the low-temperature cracking performance of the SBS-modified asphalt binder had improved much more after long-term aging compared to the unmodified binder and rubber/EVA modified binders. EVA-modified binder can sustain higher strains than rubber-modified binder (RMB), while comparing both small and large shear strain measurements. Storage and viscous moduli were determined to identify the rheological properties along the range of linear and nonlinear domains, and polymer-modified binders (PMBs) showed higher moduli in linear and nonlinear rheological conditions compared to the unmodified binder. Likely, higher cross-linking generated by polymer is the main contributory cause of such result. EVA polymer is a good choice to mitigate rutting, whereas SBS is more helpful to control fatigue cracking of the binders. (C) 2020 Elsevier Ltd. All rights reserved.
期刊：
Communications in Computer and Information Science,2020年 1254: 385-396 ISSN：1865-0929
通讯作者：
Long, M.
作者机构：
[Long S.; Long M.; Li F.] College of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha, 410114, China
通讯机构：
[Long, M.] C;College of Computer and Communication Engineering, China
会议名称：
6th International Conference on Artificial Intelligence and Security,ICAIS 2020
会议时间：
17 July 2020 through 20 July 2020
会议论文集名称：
Artificial Intelligence and Security
关键词：
Data hiding;Steganography;TPM (Three pixels matching)
作者：
Wang Boping;Liu Liang;Wang Xun;Fang Xunzhou;Hou Qinjia;...
期刊：
E3S Web of Conferences,2020年165 ISSN：2267-1242
通讯作者：
Boping, W.
作者机构：
School of energy and power engineering, Changsha University of Science and Technology, Changsha, 410114, China;Huadian Fuxin Guangzhou Energy Co., Ltd., Guangzhou, 100031, China;[Boping W.; Qinjia H.; Xun W.; Kailun W.; Liang L.; Zenghui L.] School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha, 410114, China;[Xunzhou F.] Huadian Fuxin Guangzhou Energy Co. Ltd., Guangzhou, 100031, China
通讯机构：
[Boping, W.] S;School of Energy and Power Engineering, China
会议名称：
2nd International Conference on Civil Architecture and Energy Science, CAES 2020
摘要：
In human-robot collaborative transportation and sawing tasks, the human operator physically interacts with the robot and directs the robot's movement by applying an interaction force. The robot needs to update its control strategy to adapt to the interaction with the human and to minimize the interaction force. To this end, we propose an integrated algorithm of robot's trajectory adaptation and adaptive impedance control to minimize the interaction force in physical human robot interaction (pHRI) and to guarantee the performance of the collaboration tasks. We firstly utilize the information of the interaction force to regulate the robot's reference trajectory. Then, an adaptive impedance controller is developed to ensure automatic adaptation of the robot's impedance parameters. While one can reduce the interaction force by using either trajectory adaptation or adaptive impedance control, we investigate the task performance when combining both. Experimental results on a planar robotic platform verify the effectiveness of the proposed method.
作者机构：
[Ren, Wanwan; Wu, You; Du, Ronghua] Changsha University of Science and Technology, School of Automotive and Mechanical Engineering, Changsha;410114, China;[Ren, Wanwan; Wu, You; Du, Ronghua] 410114, China
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
Data analysis and mathematical statistics are used to analyze the Interannual variation of runoff and precipitation in the Jinsha River basin from 1961 to 2015. The area average annual precipitation showed no significant upward trend, and the annual runoff showed no significant downward trend. The results of cumulative anomaly test, MK mutation test and sliding t test are consistent, there were three mutation years of 1984, 1997 and 2005 in the time series of annual precipitation and runoff in the Jinsha River basin. This study also provides necessary hydrometeorological basic information for quantitative assessment of the contribution rate of climate change and human activities to runoff change.
