DDQ/TFA： an Efficient Nonmetallic Reagent System for the Oxidative Coupling to Construct Phenanthrene Rings

A mild synthetic method of a series of phenanthrenes with different substituents on the phenanthrene ring is described.The method involves intramolecular oxidative coupling with 2,3-dichloro-5,6-dicyanobenzoquinone （DDQ）/trifluoroacetic acid（TFA） as oxidant to produce phenanthrenes in high yields and is fit for large-scale preparation.Furthermore,DDQ can be regenerated by a simple oxidation.The present approach solves a key step for the synthesis of polycyclic structures related to an alkaloid tylophorine.     

Syntheses,Electrochemical Behaviors,Spectral Properties and DFT Calculations of Two 1,3-Dithiole Derivatives

Two new 1,3-dithiole derivatives, 4,4＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7- diyl} dipyridine（2a） and 3,3＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7-diyl} dipyridine（2b） were synthesized and characterized by Fourier transform infrared（FTIR）, 1H NMR, 13C NMR and mass spectroscopies. The crystal structure of compound 2b was also studied. The optimized conformations and molecular orbital diagrams of compounds 2a and 2b were illustrated via density functional theory（DFT）. By the time-dependent DFT（TD-DFT） method, electronic absorption spectra of compounds 2a and 2b were predicted and the results achieved were in good agreement with the experimental data. The formation of the cationic radical during the electrochemical oxidation process was also proposed.     

纳米材料CuO-SnO2的实验研究

用SnCl4和Cu（NO3）2无机盐为初始原料,采用Sol-Gel（溶胶-凝胶）法制备了平均尺寸10～15nm的CuO-SnO2纳米粉料,运用X射线衍射（XRD）并结合透射电镜（TEM）分析手段分别对纳米SnO2粒径以及掺杂CuO的纳米SnO2粒径进行了较为全面的表征,同时运用差热-失重分析（DTA-TG）方法分析了纳米CuO-SnO2的形成过程。实验表明：与纯SnO2相比掺杂CuO可以有效阻碍SnO2纳米晶体的生长和团聚;以无机盐为原料,采用Sol-Gel（溶胶-凝胶）法制备CuO-SnO2纳米粉体切实可行。     

Semiconductor nanostructures enabled by aerosol technology

Aerosol technology provides efficient methods for producing nanoparticles with well-controlled composition and size distribution. This review provides an overview of methods and results obtained by using aerosol technology for producing nanostruetures for a variety of applications in semiconductor physics and device technology. Examples are given from： production of metal and metal alloy particles： semiconductor nanoparticles; semiconductor nanowires, grown both in the aerosol phase and on substrates; physics studies based on individual aerosol-generated devices; and large area deviees based on aerosol particles.     

Recent advances in the research of inorganic nanotubes and fullerene-like nanoparticles

This minireview outlines the main scientific directions in tile research of inorganic nanotubes （1NT） and fullerene-like （IF） nanoparticles from layered compounds, in recent years. In particular, this review describes to some detail the progress in the synthesis of new nanotubes, including those from misfit compounds; core-shell and the successful efforts to scale-up the synthesis of WS2 multiwalt nanotubes. The high-temperature catalytic growth of nanotubes, via solar ablation is discussed as well. Furthermore, the doping of the 1F-MoS2 nanoparticles and its influence on the physiochemical properties of the nanoparticles, including their interesting tribological properties are briefly discussed. Finally, the numerous applications of these nanoparticles as superior solid lubricants and for reinforcing variety of polymers are discussed in brief.     

A unified dynamic scaling property for the unified hybrid network theory framework

In this article, we present a new type of unified dynamic scaling property for synchronizability, which can describe the scaling relationship between dynamic synehronizability and four hybrid ratios under the unified hybrid network theory framework （UHNTF）. Our theory results can not only be applied to judge and analyze dynamic synehronizability for most of complex networks associated with the UHNTF, but also we can flexibly adjust and design different hybrid ratios and sealing exponent to meet actual requirement for the dynanfic characteristics of the UHNTF.     

Single photon sources with single semiconductor quantum dots

In t.his contribution, we briefly recall the basic concepts of quantum optics and properties of semicon- ductor quantum clot. （QD） which a.re necessary to the nnderstanding of the physics of single-photon generation with single QDs. Firstly, we address the theory of quantmn emitter-cavity system, the fluorescence and optical properties of semiconductor QDs, and the photon statistics as well as opti- cal properties of the QDs. We then review the localizatioll of single semiconductor QDs in quantum confined optical microcavity systems to achieve their overall optical properties and perfornances in terms of strong coupling regime, elfieiency, directionality, and polarization control. Furthermore, we will discuss the recenl, progress on the fabrication of single photon sources, and various a.pproaehes for embedding single QDs into mieroca,vities or photonic crystal nanoeavities and show how to ex- tend the wavelength range. We focus in part;icular on new generations of electrically driven QD single photon source leading to high repetition rates, efficiencies at elevated temperature operation. Besides strong eoupling regime, and high collection new development;s of room temperature sin- gle photon emission in the strong coupling regime are reviewed. The generation of indistinguishable photons and remaining challenges for pract ical single-photon sources are also discussed.     

我国东部持续性暴雨水汽输送特征的比较分析

运用基于拉格朗日方法的气流轨迹模式（HYSPLIT）,并结合欧拉方法,分析了江淮、江南和华南3个不同区域多个PHR过程期间的水汽通道和水汽输送特征以及通道建立和维持的天气学条件.不同区域PHR过程发生时,水汽通道及其贡献率、异常环流特征等都不同,且这些差异主要集中在南海和西太平洋地区.从水汽收支来看,华南与另外2个区域的差异较大.从水汽通道和异常环流的角度上看,江南与另外2个区域的差异较大.     

Strong law of large numbers for pair-wise extended lower/upper negatively dependent random variables

We establish some strong limit theorems for a sequence of pair-wise extended lower/upper negatively dependent random variables and give some new examples of dependent random variables.