检索结果-南通市图书馆

Study on gold concentrate leaching by iodine-iodide

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 323-328页

作者： Hai-xia Wang Chun-bao Sun shao-ying li Ping-feng fu Yu-guo Song liang li Wen-qing Xie Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines University of Science and Technology Beijing China Gold Association Shuangqishan Gold Mine

Gold extraction by iodine-iodide solution is an effective and environment-friendly method. In this study, the method using iodine-iodide for gold leaching is proved feasible through thermodynamic calculation. At the same time, experiments on flotation gold concentrates were carried out and encouraging results were obtained. Through optimizing the technological conditions, the attained high gold leaching rate is more than 85%. The optimum process conditions at 25℃ are shown as follows： the initial iodine concentration is 1.0%, the iodine-to-iodide mole ratio is 1：8, the solution pH value is 7, the liquid-to-solid mass ratio is 4：1, the leaching time is 4 h, the stirring intensity is 200 r/mim, and the hydrogen peroxide consumption is 1%.

关键词： gold extraction leaching iodine iodides

Synthesis, Crystal Structure and Antibacterial Activities of 3-[3-Methyl-(2-thienyl)methyl- enehydrazinocarbonyl]-(1H)-1,2,4-triazole

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第11期24卷 1286-1289页

作者： YANG Jian-Guo PAN fu-You shao Hong Office of Assets Administration Taizhou University Zhejiang 317000 China Department of Chemistry Taizhou University Zhejiang 317000 China

The title compound, C9H9N5OS, was synthesized by the reaction of 3-（1H）-1,2,4 -triazole hydrazine with 3-methyl-2-thiophenecarboxaldehyde in ethanol. The single crystal structure has been determined by X-ray diffraction analysis. The crystal belongs to monoclinic system, space group P2 1/n with a = 9.5550（10）, b = 11.9847（12）, c = 10.1074（11） A,β= 112.995（2）° V= 1065.47（19） A^3, Z = 4,μ = 0.290 mm^-1, Mr= 235.27, Dc = 1.467 g/cm^3 and F（000） = 488. The structure was solved by direct methods and refined to R = 0.0449. The crystal structure involves intermolecular hydrogen bonds of N-H…O and N-H…N as well as intramolecular hydrogen bond of N-H…N. Its biological activity has also been determined showing this type of compounds has certain antibacterial activity.

关键词： synthesis crystal structure antibacterial activities (1H)-1,2,4-triazole

Ionic Radius Dependent Kinetic Behavior for the Self-Assemblyand Chiral Amplification of Lanthanide Tetrahedral Cages

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第7期41卷 797-804页

作者： shao-Jun Hu Xiao-Qing Guo li-Peng Zhou li-Xuan Cai Chong-Bin Tian Qing-fu Sun State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian350002 China University of Chinese Academy of Sciences Beijing100049 China

Comprehensive Summary Understanding the kinetic process during the self-assembly and chiral amplification of metal-organic polyhedra(MOPs)is critical for the rational preparation of chiral ***,we report the ionic radius dependent kinetic processes for the self-assembly and chiral amplification of Ln4L4-type(Ln,Lanthanides;L,ligand)lanthanide tetrahedral *** chiral Eu4(LR)4 tetrahedral cage is structurally characterized by nuclear magnetic resonance(NMR),electrospray ionization time-of-flight mass spectrometry(ESI-TOF-MS),and single crystal X-ray *** study on the stereo-controlled self-assembly of circularly polarized luminescence(CPL)-active Ln4(LR)4(Ln=LaIII,PrIII and EuIII)tetrahedra manifests that the larger ionic radius of Ln leads to faster assembly ***-ligand cage assembly experiments with chiral LR/S,achiral Lac and Ln(1:3:4 molar ratio)reveal that the self-assembly and chiral amplification occur synchronously for the LaIII and PrIII cages,while two distinct steps,i.e.,first self-assembly and then chiral amplification,are observed for the EuIII *** distinct kinetic behavior is attributed to different ligands exchange rates among the mixed-ligand Ln4L4 *** work provides fundamental guidance for fabrication and property-optimization of chiral lanthanide-based molecular materials.

关键词： Chiral lanthanide tetrahedron Self-assembly Chiral amplification Kinetic lonic radius

Asymmetric twin-field quantum key distribution with both statistical and intensity fluctuations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2020年第6期72卷 37-42页

作者： shao-fu He Yang Wang Jia-Ji li Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography SSF IEUZhengzhouHenan 450001China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefeiAnhui 230026China

Twin-field quantum key distribution(TF-QKD)is a disruptive innovation which is able to overcome the rate-distance limit of QKD without trusted *** the proposal of the first TF-QKD protocol,theoretical and experimental breakthroughs have been made to enhance its ***,there still exist some practical issues waiting for *** this paper,we examine the performances of asymmetric TF-QKD protocol with unstable light sources and limited data *** statistical fluctuations of the parameters are estimated employing Azuma’s *** numerical simulations,we compare the secret key rates of the asymmetric TF-QKD protocol with different data sizes and variant intensity fluctuation *** results demonstrate that both statistical and intensity fluctuations have significant impacts on the performance of asymmetric TF-QKD.

关键词： twin-field quantum key distribution asymmetrical losses statistical fluctuations intensity fluctuations

Design,synthesis and bioassay of the emerging photo-responsive fungicides

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第8期34卷 223-226页

作者： Wen fu Xinyue Hu Qinglong Yuan Zhiping Xu Jiagao Cheng Zhong li Xusheng shao Shanghai Key Laboratory of Chemical Biology School of PharmacyEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237China Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell Metabolism School of PharmacyEast China University of Science and TechnologyShanghai 200237China Engineering Research Center of Pharmaceutical Process Chemistry Ministry of EducationSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China

Precise and spatiotemporal control over the pesticide remains to be a *** efficient controlled release systems(CRSs)have been developed to support the precise delivery of active ***,we incorporated the photoremovable protecting groups(PRPGs)into phenamacril(PHE)and obtained two photo-responsive fungicides of NV-PHE and *** 4,5-dimethoxy-o-nitrobenzyl(NV)or 7-diethylaminocoumarin(DEACM)-caged PHE could release the active molecule PHE after irradiation of UV light and blue light,*** properties and in-vitro/vivo fungicidal activities of NV-PHE and DEACM-PHE demonstrated the feasibility for light controlled release of ***-PHE could release 98%PHE by illumination of blue *** irradiated DEACM-PHE could preserve the similar bioactivity of PHE,and significantly improve the in-vitro/vivo fungicidal activities compared to the non-irradiated *** optical controlled release of PHE from DEACM-PHE enabled the precise and spatiotemporal delivery of PHE,diversifying the development of CRSs for pesticide,and providing environmentfriendly agricultural applications with high pesticide efficiency.

关键词： Phenamacril Controlled release Photoremovable protecting groups Spatiotemporal Significant difference

Cu_2ZnSnS_4 thin films prepared by sulfurization of ion beam sputtered precursor and their electrical and optical properties

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 315-319页

作者： ZHANG Jun shao Lexi fu Yujun XIE Erqing School of Physics Science and Technology Zhanjiang Normal University Zhanjiang 524048 China School of Physics Science and Technology Lanzhou University Lanzhou 730000 China School of Physics Science and Technology Zhanjiang Normal University Zhanjiang 524048 China School of Physics Science and Technology Lanzhou University Lanzhou 730000 China School of Physics Science and Technology Lanzhou University Lanzhou 730000 China

Cu2ZnSnS4 (CZTS) thin films were successfully prepared by sulfurization of ion bean sputtered precursors on soda-lime glass substrate. The single phase of stannite-type structure CZTS films were obtained as revealed in EDS and XRD analysis when the ratios of the constituents of CZTS thin films are close to stoichiometric by optimizing the conditions of precursor preparation and sulfurization. A low sheet resistivity as about 0.156 Ω·cm and a high absorption coefficient as 1×104 cm-1 were achieved in this method by Hall effect measurements and UV-VIS spectrophotometer. The optical band-gap energy of the CZTS sample is about 1.51 eV, which is very close to the optimum value for a solar-cell absorber.

关键词： Cu2ZnSnS4 thin film solar-cell ion beam sputtering

Quantization of black hole entropy from unstable circular null geodesics

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2016年第4期59卷 29-36页

作者： shao-Wen Wei Yu-Xiao liu Chun-E fu Institute of Theoretical Physics Lanzhou University School of Science Xi'an Jiaotong University

The quasinormal mode frequencies can be understood from the massless particles trapped at the unstable circular null geodesics and slowly leaking out to infinity. Based on this viewpoint, in this paper, we semiclassically construct the entropy spectrum of the static and stationary black holes from the null geodesics. The result shows that the spacing of the entropy spectrum only depends on the property of the black hole in the eikonal limit. Moreover, for a black hole far from the extremal case, the spacing is found to be smaller than 2π for any dimension, which is very different from the result of the previous work by using the usual quasinormal mode frequencies.

关键词： black hole entropy spectrum null geodesics quantization

Unveiling the Hidden Movements in the Shuttling of Rotaxanes

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2020年第5期36卷 748-754页

作者： GUO Yichang fu Haohao shao Xueguang CAI Wensheng Research Center for Analytical Sciences College cf ChemistryTianjin Key Laboratory of Biosensing and Molecular RecognitionNankai UniversityTianjin 300071P.R.China State Key Laboratory of Medicinal Chemical Biology Tianjin 300071P.R.China

Movements in molecular machines are usually diverse and coupled,but some of them are often implicit and hard to be observed in *** the present work,the two-or three-dimensional free-energy landscapes characterizing the coupled shutthng and other movements of a series of pH-triggered rotaxanes composed of a crown ether and an H-shaped axle with distinct number of phenyl rings(n=1-3)have been *** results show that although the calculated free-energy barriers against shutthng in the rotaxanes(n=2 and 3)change slightly,the move-ments coupled with the shutthng vary significantly with the axle *** high pH,the shutthng in the rotaxane of n=2 is coupled with the isomerization of the wheel,while the shutthng in the one of n=3 is accompanied by both the isomerization and the rotation of the *** addition,the crown ether imdenvent greater conlomiational change during shutthng at low pH compared to that at high *** results indicate that disentangling the coupled movements is important to reveal the underlying molecular mechanism of the shutthng.

关键词： Rotaxane Molecular machine Molecular movement Free-eiiergy landscape

Effect of the structure of backward orifices on thejet performance of self-propelled nozzles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2021年第1期18卷 245-258页

作者： Bi-Wei fu Si Zhang shao-Hu liu School of Mechanical Engineering Yangtze UniversityJinzhou 434023HubeiChina

Self-propelled nozzle is a critical component of the radial jet drilling *** backward orifice structure has a crucial influence on the propulsive force and the drilling *** improve the working performance of the nozzle,the numerical simulation model is built and verified by the experimental results of propulsive *** the theoretical model of the energy efficiency and energy coefficient of the nozzle is built to reveal the influence of the structural parameters on the jet performance of the *** results show that the energy efficiency and energy coefficient of the backward orifice increase first and then decrease with the angle *** energy coefficient of forward orifice is almost constant with the angle *** the increase in the number and diameter,energy efficiency and energy coefficient of the forward orifice gradually decrease,but the backward orifice energy coefficient first increases and then ***,it is obtained that the nozzle has better jet performance when the angle of backward orifice is 30°,the number of backward orifice is 6,and the value range of diameter is 2-2.2 *** study provides a reference for the design of efficiently self-propelled nozzle for radial jet drilling technology.

关键词： Radial jet drilling technology Self-propelled nozzle Propulsive force Energy efficiency Cavitation model