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Micellar sensitized catalytic kinetic spectrophotometry for highly accurate and reproducible determination of Ⅴ(Ⅳ) and Ⅴ(Ⅴ)

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Rare Metals 2014年第4期33卷 466-478页

作者： Ramazan Grkan can Emektas Department of Chemistry Faculty of SciencesUniversity of Cumhuriyet

A highly accurate and reproducible micellar sensitized kinetic method was proposed for determination of V（VI）. The method is based on its catalytic effect on the oxidation of Coomassie brilliant blue R 250 （CBB＋） by bromate at pH 2.0. The reaction was monitored spectro- photometrically by measuring absorbance change with a fixed-time method of 5 min at 594 and 552 nm with and without surfactant. The variables influencing the calibra- tion sensitivity were extensively investigated, and the optimal conditions were established. The linear calibration range was 10-1,600 μg.L-1 with a relative SD ranging from 0.35 % to 3.35 % （for five replicate measurements of 75, 500, 1,000, and 1,500 μg.L-1） and a detection limit of 3.8 μg.L-1. The selectivity was also investigated, and greatly enhanced by suitable masking agents. The method was successfully applied to the analysis of V（IV） in pre- sence of excess V（V） up to 25 fold in environmental waters with the recoveries of 100.0 %-102.8 % for V（IV） and 95.7 %-99.7 % for total V. Its accuracy was validated by analysis of certified reference material via the present kinetic method and standard flame atomic absorption spectrometric method after extractive preconcentration with good agreement between certified and found values.

关键词： Vanadium speciation Kineticspectrophotometry Bromate Coomassie brilliant blue R250 Micellar effect

Secure network coding from secure proof of retrievability

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Science China(Information Sciences) 2021年第12期64卷 252-253页

作者： jinyong CHANG Bilin SHAO Yanyan JI Maozhi XU Rui XUE School of Information and Control Engineering Xi'an University of Architecture and Technology School of Management Xi'an University of Architecture and Technology School of Mathematical Sciences Peking University State Key laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences

Dear editor,Compared with the traditional storing-and-forwarding routing mechanism, network coding has become a more attractive paradigm because it has been proven capable of achieving maximized throughput, enhanced r... 详细信息

关键词： Network Coding Proof of Retrievability Random Oracle Provable Security Cloud Storage

The Hardness of Amorphous Si-DLC Films by Molecular Dynamics Simulations

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 444-448页

作者：兰惠清 LIU can School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Institute of Higher Energy Physics Chinese Academy of Sciences

Silicon-doped diamond-like carbon （Si-DLC） films possess the potential to improve wear performance of DLC films in humid atmospheres and at higher temperatures. But many experimental results of Si-DLC films show that their structure and mechanical properties have changed greatly with the increasing silicon content. Therefore, molecular dynamics （MD） simulations were used to generate hydrogen-free Si-DLC films and study their nano-indentation process under the interaction of a diamond indenter. The results show that sp3/sp2（C）（only carbon atoms） always decreases with the increasing silicon content. But sp3/sp2（C＋Si） ratio increases firstly and reaches a maximum at the silicon content of 0.2, and then decreases with the further increase of the silicon content. Bulk modulus and hardness of the Si-DLC films both decrease with the increasing of the silicon content, which has the same trend with Papakonstantinou and Ikeyama＇s results. It is concluded that the hardness of the Si-DLC films is dependent on sp3/sp2（C）, not sp3/sp2（C＋Si）.

关键词： diamond-like carbon film molecular dynamics silicon hardness

Optimized determination of airborne tetracycline resistance genes in laboratory atmosphere

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Frontiers of Environmental Science & Engineering 2020年第6期14卷 41-51页

作者： Lu Song can Wang Yizhu Wang Indoor Air Environment Quality Control Laboratory of Tianjin School of Environment Science and EngineeringTianjin UniversityTianjin 300350China

Antibiotic resistance genes(ARGs)have been detected in various atmospheric *** ARGs transmission presents the public health ***,it is very difficult to quantify airborne ARGs because of the limited availability of collectable airborne particulate matter and the low biological content of *** this study,an optimized protocol for collecting and detecting airborne ARGs was *** results showed that recovery efficiency tended to increase initially and then declined over time,and a range of 550-780 copies/mmz of capture loading was recommended to ensure that the recovery efficiency is greater than 75%.As the cell walls were mechanically disrupted and nucleic acids were released,the buffer wash protects ARGs *** ratios of buffer volume to membrane area in buffer wash were *** highest concentrations of airborne ARGs were detected with 1.4μL/mm^2 buffer ***,the majority of the cells were disrupted by an ultrasonication pretreatment(5 min),allowing the efficiency ARGs detection of airborne ***,extending the ultrasonication can disrupt cell structures and gene sequence was broken down into ***,this study could provide a theoretical basis for the efficient filter collection of airborne ARGs in different *** optimized sampling method was proposed that the buffer wash was 1.4 nL/mm and the ultrasonication duration was 5 *** indoor airborne ARGs were examined in accordance with the improved protocol in two *** result demonstrated that airborne ARGs in an indoor laboratory atmosphere could pose the considerable health risk to inhabitants and we should pay attention to some complicated indoor air environment.

关键词： Airborne tetracycline resistance genes Filter sampling Capture loading Membrane pretreatment Indoor laboratory atmosphere

Thermoelectric characteristics of nanocomposites made of HgSe and Ag nanoparticles for flexible thermoelectric devices

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Nano Research 2017年第2期10卷 683-689页

作者： Junggwon Yun Kyoungah Cho Yoonbeom Park Seunggen Yang jinyong Choi Sangsig Kim Department of Electrical Engineering Korea University 145 Anam-ro Seongbuk-gu Seou1136-70 I Republic of Korea

We synthesized thermoelectric nanocomposites by mixing HgSe nanoparticles （NPs） and Ag NPs in a solution and investigated the thermoelectric properties of the nanocomposite thin films on flexible plastic substrates. The X-ray diffraction patterns and the X-ray photoelectron spectra of the nanocomposites demonstrate that cation-exchange reactions occurred spontaneously in the mixed solution of HgSe and Ag NPs and that the HgSe NPs were completely converted to Ag2Se when the Ag NP content was 20 vol.%. The maximum power factor and the thermoelectric figure of merit were obtained as 75 pW/mK2 and 0.043 at 300 K, respectively, when the Ag NP content was 10 vol.%, which is 100 times higher than that of HgSe NP thin films. In addition, the mechanical stability of the thermoelectric nanocomposite film was confirmed through repeated bending tests.

关键词： HgSe Ag25e,nanoparticles,nanocomposite,flexible thermoelectric,Seebeck

Strategic Peer-to-peer Energy Trading Framework Considering Distribution Network Constraints

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Journal of Modern Power Systems and Clean Energy 2023年第3期11卷 770-780页

作者： Yanbo Jia can Wan Biao Li College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

With the development of smart home energy management technology,prosumers are endowed with increased initiative in peer-to-peer(P2P)transactions,bringing new potential for cost *** this study,a novel strategic P2P energy trading framework is proposed considering the impact of network constraints on personal transaction *** can estimate the allowed power injection before engaging in the P2P energy trading,which is solved in a distributed manner based on the sharing form alternating direction method of multipliers(ADMM)*** quantify the network usage cost for each prosumer and promote local transactions among prosumers at the same bus,a modified continuous double auction(CDA)matching algorithm is proposed including a transaction *** adaptive aggressiveness-based bidding strategy is generated considering the risk of uncertainty in real-time energy delivery amount under the limitations of the distribution *** proposed strategic P2P energy trading framework is tested with the IEEE 37-bus distribution network and it is effective in creating profits for prosumers and supporting distribution network operations.

关键词： Bidding strategy continuous double auction(CDA) distribution network distributed algorithm peer-topeer(P2P)transaction

Space-Time Geometry of Quark and Strange Quark Matter

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Chinese Journal of Astronomy and Astrophysics 2007年第6期7卷 757-763页

作者： hsan Yilmaz can Akta■ anakkale Onsekiz Mart University Arts and Sciences FacultyDepartment of PhysicsTerzio■lu Campus17020 anakkaleTurkey anakkale Onsekiz Mart UniversityAstrophysics Research Center17020 anakkaleTurkey anakkale Onsekiz Mart University Arts and Sciences FacultyDepartment of MathematicsTerzio■lu Campus17020 anakkaleTurkey

We study quark and strange quark matter in the context of general relativity. For this purpose, we solve Einstein＇s field equations for quark and strange quark matter in spherical symmetric space-times. We analyze strange quark matter for the different equations of state （EOS） in the spherical symmetric space-times, thus we are able to obtain the space-time geometries of quark and strange quark matter. Also, we discuss the features of the obtained solutions. The obtained solutions are consistent with the results of Brookhaven Laboratory, i.e. the quark-gluon plasma has a vanishing shear （i.e. quark-gluon plasma is perfect）.

关键词： cosmology -- theory early universe

Superconducting X-ray detectors

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Science China(Information Sciences) 2020年第8期63卷 91-109页

作者： can YANG Mengting SI Lixing YOU State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT)Chinese Academy of Sciences CAS Center for Excellence in Superconducting Electronics (CENSE) Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Zhejiang Photon Technology Co.Ltd. Guigu Science Park

Owing to their high sensitivity and low noise, superconducting detectors are used for photon detection from microwave to high-energy particles. X-ray detection plays an important role in materials analysis, astronomy, and medical radiography, which require high efficiency as well as high energy resolution. However, traditional semiconducting detectors cannot fulfill these requirements. In this article, we review superconducting quantum detectors for X-ray detection, including transition-edge sensor(TES), superconducting tunneling junctions(STJs), kinetic inductance detectors(KIDs) and superconducting nanowire single-photon detectors(SNSPDs), and introduce the physical structures, working mechanisms, and device behaviors of these detectors. We also review their performances regarding X-ray detection and analyze their respective characteristics. According to recent progress and the requirements of various applications, possible improvement of superconducting detectors for X-rays are discussed.

关键词： superconducting X-ray detectors transition-edge sensors superconducting tunneling junctions kinetic inductance detectors superconducting nanowire single-photon detector

Thermoluminescence glow curve analysis and kinetic parameters of Dy-doped BaSi_(2)O_(5)phosphor

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Journal of Rare Earths 2022年第2期40卷 234-242,I0002页

作者： Y.Alajlani N.can Physics Department Jazan UniversityP.O.Box 114Jazan45142Saudi Arabia Department of Physics Faculty of Arts and SciencesManisa Celal Bayar UniversityMuradiye-Manisa45010Turkey

In this paper,Dy^(3+)incorporated BaSi_(2)O_(5)phosphors were synthesized by gel co mbustion method and characterized by X-ray diffraction(XRD).The effects of various heating rate s on thermoluminescence(TL)kinetics and glow peak temperatures of Dy^(3+)incorporated BaSi_(2)O_(5)phosphors exposed toβirradiation at room temperature were *** glow curves of the phosphor exposed toβ-irradiation(0.1-100 Gy)consist of four main peaks located at 87,130,271,and 327℃and exhibit a good linearity between 0.1 and100 *** experimental techniques including variable heating rate(VHR),repeated initial rise(RIR),peak shape(PS)and computerized glow curve deconvolution(CGCD)were employed to determine TL kinetic *** findings indicate that the TL glow peaks of the phosphor obey first-order *** of the main dosimetric peaks through the techniques mentio ned above indicates that activation energies(E)and pre-exponential factor(s)are in the range of 0.80-1.50 eV and 1.15×10^(8)-3.28×10^(13)s^(-1).Additionally,it is found that the temperature of the glow peaks shifts toward the higher temperatures and the TL intensity smoothly decreases as the heating rate *** effect on the TL intensities and glow peak temperatu res of the heating rate is discussed in terms of thermal quenching.

关键词： BaSi_(2)O_(5) Dy^(3+) Gel combustion XRD Thermoluminescence Kinetic parameters