Developing new pristine metal-organic framework (MOF)-based electrode material for high-performance supercapacitors is a considerable attractive task. Herein, a Cu4 cluster-based three-dimensional (3D) MOF ([Cu4(μ3-OH)2(atrz)2(1,3-BDC)3]·2H2O, Cu-atrz-BDC; atrz, 4-amino-1,2,4-triazole; 1,3-H2BDC, 1,3-benzenedicarboxylic acid) was synthesized and characterized by infrared spectroscopy, X-ray powder diffraction, thermogravimetric analysis, nitrogen adsorption-desorption, scanning electron microscopy, and X-ray photoelectron spectroscopy. The Cu-atrz-BDC firstly was used as an electrode material for supercapacitor. In a three-electrode system, the Cu-atrz-BDC electrode exhibited ultrahigh specific capacitance of 5525 F g−1 at 1 A g−1 and its specific capacitance can also keep about 886 F g−1 after 1000 cycles at 3 A g−1. Importantly, the Cu-atrz-BDC as the positive electrode and the rGO as the negative electrode were assembled into an asymmetric supercapacitor with excellent cycling stability, displaying the maximum energy density of 9.96 Wh kg−1 at a power density of 0.81 kW kg−1. The high supercapacitive performance might be ascribed to its porous three-dimensional structure, the nanosized particles, and better conductivity.

In order to develop supercapacitors with higher energy density, a three-dimensional cobalt-based metalorganic framework (MOF) compound ([HCo7(OH)(3)(ip)(6)(H2O)(4)]center dot 12H(2)O, Co- ip; ip=isophthalate) was synthesized by simple solvothermal reaction. Its electrochemical performances as a supercapacitor electrode material were investigated. The Co-ip electrode exhibited high specific capacitance, good cycle stability, and superior rate performance. In 1 mol.L-1 KOH solution, the maximum specific capacitance was 1 660 F.g(-1) at a current detisily of 1 A.g(-1). At a current density of 2 A.g(-1), the retention of specific capacitance was 82.7% after 3 000 cycles. The superior supercapacitive performance is attributed to the three-dimensional porous structure of Co-ip and nano-sized particles.

A cobalt-based MOF ([Co(4,4'-bpy)(tfbdc)(H2O)(2)], Co-BTH, 4,4'-bpy=4,4'-bipyridune, H(2)tfbdc=tetrafluoroterephthalic acid) was synthesized by a simple solvothermal reaction, and its performance as the electrode material for supercapacitors was evaluated for the first time. The results show that. Co-BT11 electrode has good pseudocapacitance performance, including high specific capacitance and good rate performance. In 1 mol.L-1 KOH solution, the maximum specific capacitance was 2 316 F.g(-1) at a current density of 1 A.g(-1). At the current density of 2 A.g(-1), the specific capacity of the electrode still kept 847 F.g(-1) after 1 000 cycles. The good pseudo-capacitance performance is related to the layered structure of Co-BTH and the small size nanosheets.

《无机与分析化学实验》 课程作为工科以及医学专业必修的基础课,是一门与素质教育融于一体的的综合性课程.为增加学生的学习兴趣,培养其科学素养、创新能力和实践能力,我们在无机与分析化学实验教学中开展了研究性学习的探索与实践.本文从无机与分析化学实验课的教学特点和现状入手探讨如何在该课程教学中开展研究性学习,从而达到该课程的学习目标.

Searching for new metal–organic frameworks with excellent electrochemical performances is considerably important to advance their application in supercapacitors. Herein, a Co5-cluster-based three-dimensional (3D) metal–organic framework (Co5(OH)2(O2CCH3)8·2H2O, Co5-MOF) was synthesized and characterized by X-ray powder diffraction, infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, and nitrogen adsorption–desorption. The Co5-MOF as an electrode material of supercapacitors was investigated for the first time. In a three-electrode system, the highest specific capacitance for the Co5-MOF electrode is 867 F g−1 at 1 A g−1, and the specific capacitance still remains 90.3% of the original specific capacitance after 3000 cycles, displaying its good long-term cycle stability. The asymmetric supercapacitor based on the Co5-MOF as the positive electrode and the rGO as the negative electrode presented a high energy density of 18 W h kg−1 at a power density of 0.7 kW kg−1. The high supercapacitive properties may be attributed to the nano-sized Co5-MOF particles with larger specific surface area and pore structure.

A three-component reaction of potassium alkyltrifluoroborates, the sulfur dioxide surrogate of DABCO·(SO2)2, and alkenes under photocatalysis in the presence of visible light is developed. This reaction works efficiently at room temperature with the insertion of sulfur dioxide under mild conditions, affording diverse sulfones in good to excellent yields. The alkyl radical and alkylsulfonyl radical are generated as key intermediates, and a reductive single-electron transfer is involved in the reaction process.

C-H bond sulfonylation of anilines with the insertion of sulfur dioxide under metal-free conditions is described. 2-Sulfonylanilines are generated in moderate to good yields through a three-component reaction of anilines, DABCO·(SO2)2, and aryldiazonium tetrafluoroborates under mild conditions. No metal catalysts or additives are needed for this transformation. This direct C-H functionalization is highly efficient, and broad functional group tolerance is observed. A radical process is believed to be involved. In the reaction process, the arylsulfonyl radical and the tertiary amine radical cation generated in situ from DABCO·(SO2)2, and aryldiazonium tetrafluoroborate are the key intermediates. Additionally, the tertiary amine radical cation acts as the electron carrier through a single electron transfer process.

Recent advances in the sulfonylation of alkenes via the insertion of sulfur dioxide are summarized. The sulfur dioxide surrogate of DABCO·(SO2)2 or inorganic sulfites is used in the transformation through a radical process. Two strategies for the sulfonylation of alkenes with the insertion of sulfur dioxide have been developed. In most cases, the vicinal difunctionalization of alkenes is initiated by the arylsulfonyl radical generated in situ. Although the sulfonylation of alkenes with the insertion of sulfur dioxide is efficient, the asymmetric versions are still challenging and less to be explored. It is expected that the asymmetric vicinal difunctionalization of alkenes with the insertion of sulfur dioxide will be developed rapidly in the near future.

Sulfonylation of the benzylic C-H bond is developed through a three-component reaction of aryldiazonium tetrafluoroborates, 4-methylphenols and sodium metabisulfite (Na2S2O5). The inorganic sulfite of sodium metabisulfite is used as the SO2 surrogate. In this transformation, benzylic C(sp(3))-H bond sulfonylation is achieved in the presence of a photocatalyst under visible light. A radical pathway involving the arylsulfonyl radical and intermolecular hydrogen atom abstraction is proposed.

With the acceleration of economic reform and urbanization,China's air quality is facing unprecedented pressure.It is important to identify the risk factors influencing the air quality in the process of urbanization and study the differences of risk factors and their determinant powers at different coupling stages so as to assist the government in the atmospheric environment protection and air quality improvement.According to the coupling coordination level of urbanization and air quality in Zhejiang province,2015,this paper divides the province into coordinated area,transitional zone and uncoordinated area,and reveals the risk factors of air quality in these three zones via geographical detectors.The results show that:(1)The main risk factors of different coupling coordination areas are not exactly the same;(2)Urbanization factors are usually positively correlated with annual AQI values, while natural and meteorological factors usually exhibit negative correlation;(3)The combined effect of the two-factor interaction will enhance the explanatory power of the spatial distribution of the air quality.

针对目前传染病时空分析中存在时间尺度单一的问题,提出一种面向多尺度的传染病时空分析框架.该框架综合利用自组织神经网络、核密度估计和时空扫描统计量等模型方法,从年份、季节、月份多个尺度对杭州市2006—2013年淋病、细菌性痢疾和流行性腮腺炎的时空分布特征进行了系统分析.结果表明,在人口密度高的辖区,3类传染病发病率年际变化明显,总体呈逐年下降趋势,而在人口稀疏的区县,发病率处于较低水平;各类传染病均具有明显的时空聚集性,各季节疾病高发区主要集中在杭州主城区,淋病的发病热度值无明显季节性差异,细菌性痢疾表现为夏、秋高发,冬、春低发,流行性腮腺炎则相反;淋病的时空聚类在月份分布上较分散,而细菌性痢疾的聚集时间多为每年的6—11月,流行性腮腺炎则为12月至次年5月.

A four-component reaction of 2-vinylbenzoic acids, aryldiazonium tetrafluoroborates, the sulfur dioxide surrogate DABCO·(SO2)2, and nitriles under photocatalysis in the presence of visible light is developed. This multicomponent reaction works efficiently, promoted by BF3·OEt2 with the insertion of sulfur dioxide under mild conditions, leading to sulfonated 1-isoindolinones in moderate to good yields. This route is highly selective, and several competitive pathways are not observed under these conditions. A possible mechanism involving photocatalysis and a Lewis acid is proposed.

A copper-catalyzed aminosulfonylation of aryldiazonium tetrafluoroborates, DABCO·(SO2)2, and N-chloroamines is described. This coupling reaction provides an efficient and simple approach to a wide range of sulfonamides in moderate to good yields under mild conditions. Mechanistic investigation suggests that a radical process and transition-metal catalysis are merged in this tandem reaction.

A new metal complex[Zn(H2 pdc)2 (H2 O)2 ]·2DMF (H3 pdc=3,4-pyrazoledicarboxylic acid)has been synthesized by the reaction of H3 pdc and Zn(NO3 )2 ,and characterized by elemental a-nalysis,IR spectra,and single-crystal X-ray diffraction.Structure analysis reveals that complex[Zn (H2 pdc)2 (H2 O)2 ]·2DMF has mononuclear structure,each Zn(II)ion is located in an octahedron ge-ometry,and independent units[Zn(H2 pdc)2 (H2 O)2 ]and DMF are linked by intermolecularhydrogen bonds to form a 2D supramolecular network.The thermal stability and luminescent property of the complex in the solid state have also been investigated.

Two new complexes [Cd (Hcmdpca)(2) (phen) (H2O)] (1) and [Cu-2 (Hcmdpca)(2) (phen)(4) (NO3)(2)]center dot 4H(2)O (2) (H(2)cmdpca=1-carboxymethy1-3,5-dimethyl-1H-pyrazole-4-carboxylic acid, phen=phenanthroline) have been synthesized and characterized by IR spectra, elemental analysis, single crystal X-ray diffraction, thermogravimetric analysis. Complexes 1 and 2 all crystallize in the monoclinic system and their space group are C2/c and P2,/c, respectively. In 1, Cd(II) ion takes seven-coordination mode, and Hcmdpca anion bridges adjacent Cal) ions to generate a dinuclear structure; these dinuclear structure units are assembled into a 3D network via hydrogen bonds and pi-pi interactions. 2 is an independent unit consisted of two discrete mononuclear Cu (II) complex cations, each Cu(II) ion is located in a distorted octahedral geometry. These mononuclear Cu(II) complex cations and NO3- ions are connected by electrostatic interactions and hydrogen bonds, producing a 3D supramolecular network, and the hollow space of the network are occupied by water molecules. The thermal stability and luminescent property of the complexes are also investigated. CCDC: 1495594, 1; 1495595, 2.

针对城市内涝积水问题,设计研发了基于物联网与GIS技术的城市内涝监控预警与联合调度系统,实现了对道路、下沉式立交桥等城市积水点的视频信息、积水深度以及城市排水管道水位信息、泵站蓄水池水位信息的实时监测与在线传输.将这些反映城市当前积水状况的数据与排水泵站进行链接,当监测数据达到系统设置的阈值时,可自动开启或关闭泵站,实现城市内涝排水的自动化、智能化管理,为及时有效解决城市内涝问题提供了高效的管理手段;同时,可在积水点周边路口对积水严重等级进行公示,给来往车辆及行人提供预警,以免造成不必要的人身财产损失,实现城市管理的智能化和人性化.

介绍了新课改下高中化学和大学无机与分析化学课程的教学现状.对高中化学和无机与分析化学课程授课内容进行类比、 总结,探讨了两者之间知识点的衔接方式,总结出大学教师的教学策略,如教学内容、 教学方式、 课程考核方式、 大学教师评价制度等方面应做的相应的改进措施.这些改革措施能很好提高课堂教学质量,从而帮助学生从高中化学的学习成功过渡到大学化学课程的学习.

针对当前日益突出的城市内涝问题,研究开发了城市内涝预警预报系统.该系统对排水管网运行的相关参数与城区积水数据、排水管道水位信息、雨量信息以及河道水位等防汛信息数据在线监测,并实时传榆到系统,当各项监测参数出现异常或超出系统设定的阈值,系统将会及时报警.同时,系统提供统一的调度平台,结合内涝与防汛数据,为管理决策提供完善的数据支持和调度平台.

校企合作开发素质选修课程在高等职业教育适应越来越多变的市场需求、培养全面发展的现代职业人和实现企业个性化人才选拔等方面具有独特的价值。该类课程的建设，应当充分建立在企业个性化需求的基础上，关注学生的综合素质，并通过有效的组织实现多元主体的交汇。职业院校应改革管理模式，探索建立校企推动、专兼共建、企业和学生互选的素质选修课程开发机制和开发策略。

ZnO hollow microspheres were synthesized by a facile solvothermal treatment of zinc nitrate and NaAc in the presence of polyethylene glycol 10000. The products were characterized by XRD, SEM, TG-DSC, BET techniques. The effects of the amount of zinc nitrate, the amount of PEG-10000, the reaction time and the reaction temperature on the morphology and size of products were investigated. The catalytic role of ZnO hollow microspheres in ammonium perchlorate decomposition was investigated. The result shows that ammonium perchlorate decomposition temperature decreases from 442 ℃ to 280 ℃ with the addition of ZnO hollow microspheres.