检索结果-南通市图书馆

Equilibrium and mechanism studies of gold(Ⅰ)extraction from alkaline aurocyanide solution by using fluorine-free ionic liquids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2021年第7期40卷 1987-1994页

作者： Ya-Ting Wang Men Liu nian Tang Sheng-Jian Li Yan sun Shi-Xiong Wang xiang-Jun Yang Key Laboratory of Medicinal Chemistry for Natural Resource(Yunnan University) Ministry EducationSchool of Chemical Science and TechnologyYunnan UniversityKunming 650091China

Solvent extraction based on ionic liquids is generally considered to be an environmentally benign and effective technology for gold(Ⅰ)*** aim of this work is to study gold(Ⅰ)extraction from aurocyanide solution using fluorine-free ionic liquids[A336][SCN],[A336][MTBA]and[A336][Mal].Various factors that affect gold(Ⅰ)extraction(including concentration of ionic liquids,equilibrium pH,concentration of the modifier tributyl phosphate(TBP),reaction time and initial concentration of gold in an aqueous solution)were studied and *** results indicate that the three Aliquat336-based ionic liquids all exhibit excellent behaviors for gold(Ⅰ)*** than 99.8%of gold(Ⅰ)can be extracted from the aqueous phase into the ionic liquid *** gold-loaded ionic liquids were characterized using infrared spectroscopy and mass spectrometry to study the extraction mechanism of gold(Ⅰ).The results revealed that extraction of gold(Ⅰ)into the ionic liquid phase was based on an exchange reaction between the anion Au(CN)2-in aqueous solution and the anion SCN-in ionic liquid[A336][SCN].The logarithmic relationship between distribution coefficient and TBP concentration indicates that two TBP molecules are involved in the formation of the extracted *** extracted complex was determined to be A336^(+)·Au(CN)_(2)^(-)·2 *** addition,the gold(Ⅰ)-loaded ionic liquids can be efficiently stripped using NH4 SCN,2-methylthiobenzoic acid and methyl *** results establish that Aliquat 336-based ionic liquids have potential application prospects in gold(Ⅰ)recovery from cyanide solutions.

关键词： Gold(Ⅰ) Solvent extraction Ionic liquid Alkaline aurocyanide solution

Molecular Engineering Design for High-Performance Aqueous Zinc-Organic Battery

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2023年第3期15卷 98-111页

作者： Tianjiang sun Weijia Zhang Qingshun nian Zhanliang Tao Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryHaihe Laboratory of Sustainable Chemical TransformationsRenewable Energy Conversion and Storage CenterNankai UniversityTianjin 300071People’s Republic of China CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringHefei National Laboratory for Physical Science at the MicroscaleUniversity of Science and Technology of China HefeiHefei 230026AnhuiPeople’s Republic of China

Novel small sulfur heterocyclic quinones(6a,16adihydrobenzo[b]naphtho[2′,3′:5,6][1,4]dithiino[2,3-i]thianthrene-5,7,9,14,16,18-hexaone(4S6Q)and benzo[b]naphtho[2′,3′:5,6][1,4]dithiino[2,3-i]thianthrene-5,9,14,18-tetraone(4S4Q))are developed by molecule structural design method and as cathode for aqueous zincorganic *** conjugated thioether(–S–)bonds as connected units not only improve the conductivity of compounds but also inhibit their dissolution by both extendedπ-conjugated plane and constructed flexible molecular ***,the Zn//4S6Q and Zn//4S4Q batteries exhibit satisfactory electrochemical performance based on 3.5 mol L-1(M)Zn(ClO4)*** instance,the Zn//4S6Q battery obtains 240 and 208.6 mAh g^(-1)of discharge capacity at 150 mA g^(-1)and 30 A g^(-1),*** excellent rate capability is ascribed to the fast reaction *** system displays a superlong life of 20,000 cycles with no capacity fading at 3 A g^(-1).Additionally,the H+-storage mechanism of the 4S6Q compound is demonstrated by ex situ analyses and density functional theory ***,the battery can normally work at-60℃benefiting from the anti-freezing electrolyte and maintain a high discharge capacity of 201.7 mAh g^(-1),which is 86.2%of discharge capacity at 25℃.The cutting-edge electrochemical performances of these novel compounds make them alternative electrode materials for Zn-organic batteries.

关键词： Aqueous Zn-organic battery Small sulfur heterocyclic quinones Conjugated thioether skeleton Superlong cycling life H+-involved mechanism -60℃

在线全文

学校读者我要写书评

暂无评论

声波激励的超小型纳机电系统磁电天线

通信对抗 2017年第4期36卷 51-58页

作者： Tianxiang Nan Hwaider Lin Yuan Gao Alexei Matyushov Guoliang Yu Huaihao Chen Neville sun Shengjun Wei Zhiguang Wang Menghui Li Xinjun Wang Amine Belkessam Rongdi Guo Brian Chen James Zhou Zhenyun Qian Yu Hui Matteo Rinaldi Michael E.McConney BrANDon M.Howe Zhongqiang Hu John G.Jones Gail J.Brown nian xiang sun 张建强(翻译) 陈鼎鼎(审校) W.M.Keck Laboratory for Integrated Ferroics and Department of Electrical and Computer EngineeringNortheastern UniversityBostonMA 02115USA Westford Academy WestfordMA 01886USA Andover High School AndoverMA 01810USA Materials and Manufacturing Directorate Air Force Research LaboratoryWright-Patterson Air Force BaseDaytonOH 45433USA 不详

当前的小型天线依赖于电磁波的谐振,因此天线的尺寸与电磁波波长相关。典型的天线尺寸大于波长的1/10,而进一步缩小天线尺寸在近十年来都是一个公开的挑战。介绍一种通过悬浮铁氧/压电薄膜异质结构的声波激励纳机械磁电天线。这种磁电... 详细信息

当前的小型天线依赖于电磁波的谐振,因此天线的尺寸与电磁波波长相关。典型的天线尺寸大于波长的1/10,而进一步缩小天线尺寸在近十年来都是一个公开的挑战。介绍一种通过悬浮铁氧/压电薄膜异质结构的声波激励纳机械磁电天线。这种磁电天线通过其在声波谐振频率处的磁电效应接收和发射电磁波。磁电天线中的体声波激发铁磁薄膜的磁化振荡,产生电磁波的辐射;反之,天线感应电磁波的磁场,得到压电电压输出。这种磁电天线(尺寸仅为波长的千分之一)比现有小型天线的尺寸小1到2个数量级,但性能却没有降低,在便携式无线通信系统中具有很大的应用潜力。

关键词：纳米板薄膜体声波谐振器纳机电系统

Magnesium single-atom catalysts with superbasicity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第6期66卷 1737-1743页

作者： xiang-Bin Shao Yao nian Song-Song Peng Guo-Song Zhang Meng-Xuan Gu You Han Xiao-Qin Liu Lin-Bing sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Magnesium-related solid bases have long been considered catalysts with weak or medium *** we report the fabrication of Mg single-atom catalysts with superbasicity for the first time.A sublimation-migration-anchoring strategy is employed,in which the Mg net is sublimated,transported by Ar,and trapped by defective graphene(producing Mg_(1)/G).Simulated and experimental results demonstrate that Mg single atoms are anchored on graphene in tetra-coordination,and Mg single atoms cooperating with C atoms give superbasicity,which differs from conventional alkali/alkaline earth metal oxides with basicity originating from O *** new solid base is highly active in the synthesis of dimethyl carbonate through transesterification of ethylene carbonate with methanol,which is usually catalyzed by strong *** turnover frequency value reaches 99.6 h^(-1) on Mg_(1)/G,which is much higher than that of traditional Mg-related counterparts(1.0–5.6 h^(-1))and even superior to that of typical Na and K-related solid superbases(29.8–36.2 h^(-1))under similar conditions.

关键词： solid superbase single Mg atoms heterogeneous catalysts transesterification reaction

Penile sensory thresholds in subtypes of premature ejaculation： implications of comorbid erectile dysfunction

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2018年第4期20卷 330-335页

作者： xiang Chen Fei-xiang Wang Chao HU nian-Qin Yang Ji-Can Dai Department of Urology Ren Ji Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200001 China Department of Urology Zhongshan Hospital Fudan University Shanghai 200032 China Shanghai Key Laboratory of Forensic Medicine Shanghai Forensic Service Platform Academy of Forensic Science Shangha 200063 China

Penile hypersensitivity plays an important role in premature ejaculation （PE）, but differences in penile sensitivity among subtypes of PE are unknown. Therefore, we compared penile sensory thresholds in PE subtypes of lifelong and acquired PE, PE with and without erectile dysfunction （ED）, PE with an intravaginal ejaculation latency time 〈1 min and 〉1 min, and PE with and without orgasmic pleasure perceptual dysfunction. During August 2014 to January 2016, 136 patients with PE were included. Penile warm, cold, and vibratory thresholds were measured. Data of clinical characteristics, sexual life, Premature Ejaculation Diagnostic Tool （PEDT） score, and the 5-item version of the International Index of Erectile Function （IIEF-5） score were collected. Vibratory thresholds of the PE with ED group were higher in the right coronal sulcus （median amplitude： 4.92 vs 3.65 μm, P= 0.02） and the right penile shaft （median amplitude： 3.87 vs 3.30 μm, P = 0.03）, while differences in penile sensory thresholds between other subtypes were not significant. The median PEDT score was lower in the PE without ED group （12 vs 14, P 〈 0.001）. The IIEF-5 and PEDT scores were negatively correlated （r = -0.29, P 〈 0.001）. Patients with orgasmic pleasure perceptual dysfunction had a lower median IIEF-5 score （20 vs 21, P = 0.02）. Patients with PE and ED had lower penile sensitivity, and ED was associated with more severe symptoms and weaker orgasmic pleasure perception. In men with PE, management of comorbid ED is necessary. In case of side effects in erectile function, topical anesthetics should be cautiously used in men with PE and ED.

关键词： classification erectile dysfunction penile sensitivity penis premature ejaculation sensory thresholds

Asymptotic Formulae for Brillouin Index on Riemannian Manifolds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第7期23卷 1297-1302页

作者： Wen xiang sun LMAM School of Mathematical SciencesPeking University

We establish several asymptotic formulae for Brillouin index on fiat tori. As an application of these formulae it is proved that the topological entropy of a geodesic flow on a fiat torus is zero.

关键词： flat torus Brillouin index geodesic flow topological entropy

Topological Entropy of a Graph Map

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2018年第2期34卷 194-208页

作者： Tai xiang sun Guangxi Key Laboratory Cultivation Base of Cross-border E-commerce Intelligent Information Processing Guangxi University of Finance and Economics

Let G be a graph and f： G → G be a continuous map. Denote by h（f）, P（f）, AP（f）, R（f） and w（x, f） the topological entropy of f, the set of periodic points of f, the set of almost periodic points of f, the set of recurrent points of f and the w-limit set of x under f, respectively. In this paper, we show that the following statements are equivalent：（1） h（f）〉 O. （2） There exists an x ∈ G such that w（x, f） ∩ P（f） ≠θ and w（x, f） is an infinite set. （3） There exists an x ∈ G such that w（x, f） contains two minimal sets. （4） There exist x, y ∈G such that w（x, f） - w（y, f） is an uncountable set andw（y,f）∩w（x,f）≠θ. （5） There exist anx C Gand a closed subset A w（x,f） with f（A） A such that w（x,f） - A is an uncountable set. （6） R（f） - nP（f） ≠θ. （7） f｜P（f） is not pointwise equicontinuous.

关键词： Topological entropy periodic point w-limit set recurrent point

Theoretical Analysis of 4f and 5p Inner-Shell Excitations of W-W^(3+) Ions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第11期29卷 52-55页

作者： CAO xiang-nian SU Mao-Gen sun Dui-Xiong FU Yan-Biao DONG Chen-Zhong Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070

Detailed theoretical calculations are performed for the 4f and 5p inner-shell excitations of W-W^(3+) ions using the multiconfiguration Hartree–Fock method in order to better understand the origin of the XUV photoabsorption spectra of W atoms from the dual laser-produced plasma experiment(Costello et ***.B 24(1991)5063 and the spectra of photon-induced single ionization of W^(q+) ions(q=1,2,3)(Müller et ***.T1441(2011)014052)from photon-ions merged beam experiments,*** broad and strong resonances in the experimental spectra have also been theoretically identified mainly from 5p–5d *** 4f–5d,6d and 5p–6d transitions also make a small contribution to each spectrum,which are superimposed on the 5p–5d transition *** on the assumption of a normalized Boltzmann distribution among the excited states,we succeed in reproducing spectra which are in good agreement with experiments.

关键词： spectra Hartree excited

Gradient Estimate for the Positive Solutions of Lu=0 and Lu=?u/?t on Conformal Solitons

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2021年第11期37卷 1768-1782页

作者： xiang LI Jun sun School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026P.R.China School of Mathematics and Statistics Wuhan UniversityWuhan 430072P.R.China Hubei Key Laboratory of Computational Science Wuhan UniversityWuhan 430072P.R.China

In this paper,we prove gradient estimates for the positive solutions of Lu=0 and Lu=?u/?t on conformal solitons,where L(·)=Δ(·)+.We also give some applications for them.

关键词： Gradient estimate conformal solitons