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Decolorization of Methyl Orange by a new clay-supported nanoscale zero-valent iron:Synergetic effect,efficiency optimization and mechanism

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Journal of Environmental Sciences 2017年第2期29卷 8-17页

作者： Xiaoguang Li Ying Zhao Beidou Xi Xiaoguang Meng Bin Gong Rui Li Xing Peng Hongliang Liu School of Environment Beijing Normal UniversityBeijing 100875China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental and Municipal Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Center for Environmental Systems Stevens Institute of TechnologyHobokenNJ 07030USA

In this study, a novel nanoscale zero-valent iron（n ZVI） composite material was successfully synthesized using a low-cost natural clay, ＂Hangjin 2~#clay＂（HJ clay） as the support and tested for the decolorization of the azo dye Methyl Orange（MO） in aqueous solution by n ZVI particles. According to the characterization and MO decolorization experiments, the sample with 5：1 HJ clay-supported n ZVI（HJ/n ZVI） mass ratio（HJ-n ZVI5） showed the best dispersion and reactivity and the highest MO decolorization efficiency. With the same equivalent Fe0 dosage, the HJ-n ZVI1 and HJ-n ZVI5 samples demonstrated a synergetic effect for the decolorization of MO： their decolorization efficiencies were much higher than that achieved by physical mixing of HJ clay and n ZVIs, or the sum of HJ clay and n ZVIs alone. The synergetic effect was primarily due to the improved dispersion and more effective utilization of the n ZVI particles on/in the composite materials. Higher decolorization efficiency of MO was obtained at larger HJ-n ZVI dosage, higher temperature and under N2 atmosphere, while the MO initial concentration and p H were negatively correlated to the efficiency. HJ clay not only works as a carrier for n ZVI nanoparticles, but also contributes to the decolorization through an ＂adsorption-enhanced reduction＂ mechanism. The high efficiency of HJ-n ZVI for decontamination gives it great potential for use in a variety of remediation applications.

关键词： Nanoscale zero-valent iron Clay Material optimization Methyl Orange

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Population of Merging Compact Binaries Inferred Using Gravitational Waves through GWTC-3

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Physical Review X 2023年第1期13卷 011048-011048页

作者： R. Abbott T. D. Abbott F. Acernese K. Ackley C. Adams N. Adhikari R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith T. Akutsu P. F. de Alarcón S. Akcay S. Albanesi A. Allocca P. A. Altin A. Amato C. Anand S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando T. Andrade N. Andres T. Andrić S. V. Angelova S. Ansoldi J. M. Antelis S. Antier F. Antonini S. Appert Koji Arai Koya Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud M. Arogeti S. M. Aronson K. G. Arun H. Asada Y. Asali G. Ashton Y. Aso M. Assiduo S. M. Aston P. Astone F. Aubin C. Austin S. Babak F. Badaracco M. K. M. Bader C. Badger S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer A. Balsamo G. Baltus S. Banagiri D. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi C. P. L. Berry D. Bersanetti A. Bertolini J. Betzwieser D. Beveridge R. Bhandare U. Bhardwaj D. Bhattacharjee S. Bhaumik I. A. Bilenko G. Billingsley S. Bini R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini L. D. Bonavena F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. Brandt J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic C. Buy R. L. Byer L. Cadonati LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Inter-University Centre for Astronomy and Astrophysics Pune 411007 India University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Universitat de les Illes Balears IAC3–IEEC E-07122 Palma de Mallorca Spain University College Dublin Dublin 4 Ireland INFN Sezione di Torino I-10125 Torino Italy Università di Napoli “Federico II” Complesso Universitario di Monte S. Angelo I-80126 Napoli

We report on the population properties of compact binary mergers inferred from gravitational-wave observations of these systems during the first three LIGO-Virgo observing runs. The Gravitational-Wave Transient Catalog 3 (GWTC-3) contains signals consistent with three classes of binary mergers: binary black hole, binary neutron star, and neutron star–black hole mergers. We infer the binary neutron star merger rate to be between 10 and 1700 Gpc−3 yr−1 and the neutron star–black hole merger rate to be between 7.8 and 140 Gpc−3 yr−1, assuming a constant rate density in the comoving frame and taking the union of 90% credible intervals for methods used in this work. We infer the binary black hole merger rate, allowing for evolution with redshift, to be between 17.9 and 44 Gpc−3 yr−1 at a fiducial redshift (z=0.2). The rate of binary black hole mergers is observed to increase with redshift at a rate proportional to (1+z)κ with κ=2.9−1.8+1.7 for z≲1. Using both binary neutron star and neutron star–black hole binaries, we obtain a broad, relatively flat neutron star mass distribution extending from 1.2−0.2+0.1 to 2.0−0.3+0.3M⊙. We confidently determine that the merger rate as a function of mass sharply declines after the expected maximum neutron star mass, but cannot yet confirm or rule out the existence of a lower mass gap between neutron stars and black holes. We also find the binary black hole mass distribution has localized over- and underdensities relative to a power-law distribution, with peaks emerging at chirp masses of 8.3−0.5+0.3 and 27.9−1.8+1.9M⊙. While we continue to find that the mass distribution of a binary’s more massive component strongly decreases as a function of primary mass, we observe no evidence of a strongly suppressed merger rate above approximately 60M⊙, which would indicate the presence of a upper mass gap. Observed black hole spins are small, with half of spin magnitudes below χi≈0.25. While the majority of spins are preferentially aligned wi

关键词： Gravitational wave sources Gravitational waves Gravitational wave detection

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On the stability of nonlinear time-varying spacecraft control systems 68

On the stability of nonlinear time-varying spacecraft contro...

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68th International Astronautical Congress: Unlocking Imagination, Fostering Innovation and Strengthening Security, IAC 2017

作者： Xie, Yongchun Chen, Zhihua Science and Technology on Space Intelligent Control Laboratory Beijing Institute of Control Engineering Beijing100094 China Tianjin Key Laboratory of Microgravity and Hypogravity Environment Simulation Technology Tianjin330452 China

ISBN: (纸本)9781510855373

Stability is crucial for spacecraft control system. For rigid-body satellites or rigid-body satellites with flexible appendages, the closed-loop control systems are linear time-invariant (LTI) systems when linear controller, such as PID controllers are used. The stability of such kind of systems is usually analyzed by the Nyquist criterion. And the gain margin and phase margin of the control systems can be obtained. But for spacecraft with the consumption of liquid propellants, the Nyquist method is no longer suitable for stability analysis, especially when nonlinear controllers are used. Though Lyapunov stability analysis method can be used for time-varying linear or nonlinear systems, it cannot provide the stability margin that is widely used in engineering, thus limiting its practical applications. In order to solve this problem, a new framework for stability analysis of nonlinear time-varying systems based on computer simulation, which is suitable for engineering applications, is discussed in this paper. And some preliminary theoretical results are introduced. © 2017 International Astronautical Federation IAF. All rights reserved.

关键词： Closed loop control systems

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Coalition formation based on a task-oriented collaborative ability vector

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Frontiers of Information technology & Electronic engineering 2017年第1期18卷 139-148页

作者： Hao FANG Shao-lei LU Jie CHEN Wen-jie CHEN School of Automation Beijing Institute of Technology State Key Laboratory of Intelligent Control and Decision of Complex Systems

Coalition formation is an important coordination problem in multi-agent systems, and a proper description of collaborative abilities for agents is the basic and key precondition in handling this problem. In this paper, a model of task-oriented collaborative abilities is established, where five task-oriented abilities are extracted to form a collaborative ability vector. A task demand vector is also described. In addition, a method of coalition formation with stochastic mechanism is proposed to reduce excessive competitions. An artificial intelligent algorithm is proposed to compensate for the difference between the expected and actual task requirements, which could improve the cognitive capabilities of agents for human commands. Simulations show the effectiveness of the proposed model and the distributed artificial intelligent algorithm.

关键词： Collaborative vector Task allocation Multi-agent system Coalition formation Artificial intelligence

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Research on Power Flexible Load Regulation technology Based on Demand Response 8

Research on Power Flexible Load Regulation Technology Based ...

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8th IEEE International Conference on Electronics Information and Emergency Communication, ICEIEC 2018

作者： Bin, Yang Kun, Shi Dezhi, Li Xin, Ye Bin, Li Yiyun, Li State Grid Jiangsu Electric Power Company Nanjing China Beijing Key Laboratory of Demand Side Multi-Energy Carriers Optimization and Interaction Technique China Electric Power Research Institute Haidian District Beijing China School of Electric and Electronic Engineering North China Electric Power University BeijingP07546073 China Beijing China-Power Grid Information Technology Co. Ltd. State Grid Information and Telecommunication Group Beijing China

ISBN: (纸本)9781538664483

The sustained growth of power peak load and the rapid development of intermittent energy pose new challenges to the regulation capability of the power system. As a complement to power generation regulation, flexible load regulation has become a hot spot at home and abroad. From the perspective of the flexible load involved in the regulation of grid operation, reviewed recent achievements at home and abroad in the flexible architecture of load regulation, and comparative analysis of the advantages and disadvantages of different scenarios applicable regulatory framework, then establish a flexible demand response load model. Combined with China's national conditions, it proposes a proposal for developing a flexible load control based on demand response. © 2018 IEEE.

关键词： Electric load management

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Perturbation effect of rock rheology under uniaxial compression

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Journal of Central South University 2017年第7期24卷 1684-1695页

作者： GAO Yan-fa HUANG Wan-peng QU Guang-long WANG Bo CUI Xi-hai FAN Qing-zhong School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China College of Mining and Safety Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control(Shandong University of Science and Technology) Qingdao 266590China North China Institute of Science and Technology Langfang 065201China College of Water Conservancy and Civil Engineering Shandong Agricultural UniversityTaian 261000China

Soft and medium-hard rocks are subjected to high rheology under high stress,and they are prone to a relatively large-degree of deformation when perturbed by external impacting *** phenomenon where rock deformation is developed due to external impacting perturbation in the rheological state is defined as the rock rheological perturbation *** work presents a new experimental system for investigating the rock rheological perturbation effect with experiments on medium-hard red *** from our analysis show that red sandstone changes under two mechanical mechanisms:deformation-hardening effects at low stress states,and damage-fracture effects at high stress states when impacted by certain external impacting *** sandstone tested in our experiments has a strain threshold of about 90% of the ultimate strain under the perturbation effect;the red sandstone is sensitive to a perturbed load when its actual strain exceeds the *** perturbed deformation process of the rock can be divided into three phases:decline,approximately constant speed and *** rock will be rapidly destroyed when the perturbed deformation accumulates to a certain *** perturbation effect of rock deformation under uniaxial compression is more obvious than that under axial *** on our experiment,a constitutive relation of the rock rheological perturbation effect is developed.

关键词： rock rheology perturbation effect experimental system strain threshold

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Efficient dynamic coherence transfer relying on offset locking using optical phase-locked loop

Efficient dynamic coherence transfer relying on offset locki...

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2017 International Conference on Optical Instruments and technology: Optoelectronic Devices and Optical Signal Processing

作者： Xie, Weilin Shi, Hongxiao Zhou, Qian Xia, Zongyang Qin, Jie Zhang, Lin Lin, Xi Hu, Weisheng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China School of Optoelectronics Beijing Institute of Technology Beijing100081 China Laboratoire Aimé Cotton CNRS-Université Paris Saclay Campus D'Orsay Orsay Cedex91405 France School of Electrical and Computer Engineering Georgia Institute of Technology North Avenue AtlantaGA30332 United States

ISBN: (数字)9781510617469

ISBN: (纸本)9781510617452

We design and experimentally demonstrate a highly efficient coherence transfer based on composite optical phaselocked loop comprising multiple feedback servo loops. The heterodyne offset-locking is achieved by conducting an acousto-optic frequency shifter in combination with the current tuning and the temperature controlling of the semiconductor laser. The adaptation of the composite optical phase-locked loop enables the tight coherence transfer from a frequency comb to a semiconductor laser in a fully dynamic manner. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Microwave photonics

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Giant Negative Thermal Expansion Induced by the Synergistic Effects of Ferroelectrostriction and Spin-Crossover in PbTiO3-Based Perovskites

arXiv

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arXiv 2019年

作者： Pan, Zhao Chen, Jun Yu, Runze Patra, Lokanath Ravindran, Ponniah Sanson, Andrea Milazzo, Ruggero Carnera, Alberto Hu, Lei Yamamoto, Hajime Ren, Yang Huang, Qingzhen Sakai, Yuki Nishikubo, Takumi Ogata, Takahiro Fan, Xian Li, Yawei Li, Guangqiang Hojo, Hajime Azuma, Masaki Xing, Xianran State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan430081 China Laboratory for Materials and Structures Tokyo Institute of Technology 4259 Nagatsuta Midori Yokohama226-8503 Japan Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing100083 China Department of Physical Chemistry University of Science and Technology Beijing Beijing100083 China Department of Physics Central University of Tamil Nadu Thiruvarur610101 India Central University of Tamil Nadu ThiruvarurTamil Nadu610101 India Department of Physics and Astronomy University of Padova Padova I35131 Italy X-ray Science Division Argonne National Laboratory ArgonneIL60439 United States GaithersburgMD United States

The discovery of unusual negative thermal expansion (NTE) provides the opportunity to control the common but much desired property of thermal expansion, which is valuable not only in scientific interests but also in practical applications. However, most of the available NTE materials are limited to a narrow temperature range, and the NTE effect is generally weakened by means of various modifications. Here, we report an enhanced NTE effect that occurs over a wide temperature range (α V = -5.24 × 10-5 °C-1, 25-575 C), and this NTE effect is accompanied by an abnormal enhanced tetragonality, a large spontaneous polarization, and a G-type antiferromagnetic ordering in the present perovskite-type ferroelectric of (1-x)PbTiO3-xBiCoO3. Specifically, for the composition of 0.5PbTiO3-0.5BiCoO3, an extensive volumetric contraction of ~4.8 % has been observed near the Curie temperature of 700 °C, which represents the highest level in PbTiO3-based ferroelectrics. According to our experimental and theoretical results, the giant NTE originates from a synergistic effect of the ferroelectrostriction and spin-crossover of cobalt on the crystal lattice. The actual NTE mechanism is contrasted with previous functional NTE materials, in which the NTE is simply coupled with one ordering such as electronic, magnetic, or ferroelectric ordering. The present study sheds light on the understanding of NTE mechanisms and it attests that NTE could be simultaneously coupled with different orderings, which will pave a new way toward the design of large NTE materials. Copyright © 2019, The Authors. All rights reserved.

关键词： Thermal expansion

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Research on the Mining Effect of Floor Strata in Deep Coal Seam Mining: A Case Study of #7 Coal Seam at Chazhuang Coal Mine

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IOP Conference Series: Earth and Environmental Science 2020年第5期570卷

作者： Wenquan Zhang Xintao Wu Jianli Shao Yanghui Ren Zaiyong Wang College of Energy and Mining Engineering Shandong University of Science and Technology Qingdao 266590 China. State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266590 China. Mining Engineering National Experimental Teaching Demonstration Center Shandong University of Science and Technology Qingdao 266590 China. Central Research Institute China Coal Industry Group Beijing 100020 China

Studying the mining effect of floor strata in deep coal seam mining is beneficial for evaluating and relieving the risk of water inrush from the floor. In addition, such research forms the basis for ensuring the support and stability of roadways and chambers in the lower part of the coal seam. By considering the mining of #7 coal seam in the 7600 deep mining area of the Chazhuang coal mine in Feicheng coalfield as the engineering background, this study analyzes the distribution law of mining abutment pressure and the range of failure depth affected by mining using elastic theory. In addition, the stress, strain, and failure states of the floor rock mass affected by mining are comprehensively simulated and studied using the FLAC3D finite difference software combined with field measurement results of rock movement in the lower roadway of the #7 coal seam. The mining effect of the floor is further compared and studied, providing a scientific reference basis for realizing the safe mining of coal in confined water in the deep lower group of the Feicheng coalfield.

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CPSS-based Signal Forwarding Method at Relays for Full-duplex Cooperative Vehicular Networks

CPSS-based Signal Forwarding Method at Relays for Full-duple...

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2018 IEEE Intelligent Vehicles Symposium, IV 2018

作者： Han, Shuangshuang Ma, Houxue Wang, Xiao Liu, Hong Cao, Dongpu Wang, Fei-Yue State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100190 China Qingdao Academy of Intelligent Industries Shandong266000 China Qingdao Huituo Intelligent Machine Company Qingdao China JIANGSU XCMG CONSTRUCTION MACHINERY RESEARCH INSTITUTE LTD Xuzhou Jiangsu221004 China Mechanical and Mechatronics Engineering University of Waterloo 200 University Avenue Wes WaterlooONN2L 3G1 Canada Research Center for Military Computational Experiments and Parallel Systems Technology National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781538644522

With increasing popularity of Internet of Vehicles (IoV), concerns for reliable and low complexity communication techniques are proposed due to the requirements of signal reliability and transmission delay for vehicles. Meanwhile, the explosive and pervasive use of social network applications further adds drivers' social relationships and behavioural characteristics into it, and makes it a cyber-physical-social system (CPSS). This paper proposes and analyzes an improved forward scheme for full deplex cooperative vehicular networks in terms of its CPSS features. The proposed CPSS-based forwarding (CPSS-F) strategy forwards a soft estimate of the received signal based on social historic data at the relay node (vehicle/infrastructure) to the destination node (vehicle/infrastructure), which achieves improved reliability than the two conventional strategies in cooperative networks, i.e., amplify-and-forward (AF) and decode-and-forward (DF). Furthermore, the proposed CPSS-F relay achieves performance gains and complexity reduction compared to the conventional AF and DF. Experimental results further confirm the advantages of the proposed CPSS-F for cooperative vehicular networks. The proposed CPSS-F approach is easily extended to other cooperative vehicular social networks, for example, multi-way, half-duplex, or large-antenna networks. © 2018 IEEE.

关键词： Complex networks

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