Study on the C_(60)-Caged States of H_2 and N_2

Overthepasttenyears,thediscoveryandadvancesinfullerenechemistryhavegreatlybroadenedourknowledgeandvisualfie1dl4.Itcanbesaidthatthissubjectwillstillbeconsideredasanimportantoneandwil1developintensively.OnthebasisofknowledgeandaseriesofourworkabouttheendohedralcomplexesofCso,onthisnote,wewouldliketotaketheCoocageasaprototypetostudythepropertiesofthecageforcefield,namelyhowthepropertiesofsmallmoleculessuchasH2,N2,etc.,insidetheCoocage,areeffected.ComputationalmethodandresultsInthiswork,wecarryo…     

A Novel Compound From Ceratostigma Minus

PreviouspaPershavereportedtheisoIationofseveralcompounds,plumbasidesA-C,plumbagin,quercetin,myricetin,quercetin3-O-glucoside,myricetin3-O-rhamnosideandmaltol-O-glucosidefromCeratostigmaminusl'2.Thecontinuationofourresearchworkforbioactivecompoundshaveledtotheisolationofanovelcompound,plumbocatechinA1.Thestructureelucidationof1weremadeby2D-NMRtechniques.PlumbocatechinA1wasobtainedasanamorPhouspowder-EIMSclearlyrevealedthemolecularweighttobe346andHREIMSestablisheditselementalformulaasC…     

Hausdorff centered measure of certain linear Cantor sets

Thenotionofpackingmeasure ,introducedinRefs.[1— 3],hasbeenusedincomparisonwithHausdorffmeasuretostudytheregularityandrectifi abilityofsetsintheplane[4 ] .TheHausdorffmeasureisdefinedusingeconomicalcoversofaset,whilethepackingmeasureisdefinedviapackingwithdisjointballscenteredinthegivenset (formoredetailsseeRefs .[5— 7]) .Asasymmetryofthepackingmea sure ,theHausdorffcenteredmeasure ,definedbythecoverswithballscenteredinthegivenset,wasintro ducedinRef .[4 ].RaymondandTricot[8] verifiedthatt…     

Development of Electron Temperature Measuring System by Silicon Drift Detector

The soft X-ray spectroscopy, laser Thomson scattering and electron cyclotron emission （ ECE ） are usually adopted for electron temperature measurement in fusion research of magnetic confinement. The particular soft X-ray spectroscopy has the very good spatial-temporal resolution and smaller measuring error than laser Thomson scattering, a close spatial-temporal resolution to ECE, absolute measurement ability, and smaller influence by suprathermal and runaway electrons than ECE.     

基于EEMD和SVM的冷轧机垂直振动相关故障的诊断

通过对冷板带轧机垂直振动过程的机理进行分析,结合轧机系统结构模型,建立含振动因素的冷轧机垂向系统动态轧制力模型.考虑复杂工况下,轧机在生产不同规格带钢时,由工艺参数波动等广义故障所致轧机垂直振动现象,基于工业现场数据进行数据驱动的故障诊断算法研究.采用集成经验模态分解算法对实测轧制力信号进行分解,选取有效的固有模态函数的能量作为特征向量,并将其输入到支持向量机分类器中,通过分类器对正常状态和故障状态进行区分,以实现轧机振动相关故障的准确诊断.     

Continuous-wave Nd:KGd(WO4)2 single-longitudinal-mode laser

A continuous-wave Nd:KGd(WO₄)₂ single-longitudinal-mode laser is demonstrated with Fabry-Perot etalons in a simple linear cavity. The thermal lens effect is dramatically lowered by propagating the laser beam along the ‘athermal’ direction inside the laser crystal, which is very beneficial to removing the heat generated in the mode selection process. The maximum single-longitudinal-mode output power obtained is 64.8 mW at incident pump power of 4.7 W, corresponding to an optical conversion efficiency of 1.3% and a slope efficiency of 1.7%.     

Metal-free visible-light-induced oxidative cyclization reaction of 1,6-enynes and arylsulfinic acids leading to sulfonylated benzofurans

A new and convenient visible-light-induced method has been developed for the synthesis of sulfonylated benzofurans via oxidative cyclization reaction of 1,6-enynes and arylsulfinic acids.This reaction was carried out under metal-free and mild conditions,in which the C-S,C-C and C=O bonds could be sequentially formed in one pot operation.     

Metal-free synthesis of substituted phenols from arylboronic acids in water at room temperature

A convenient,efficient and practical metal-free method for the synthesis of substituted phenols from arylboronic acids has been developed.The protocol uses hydrogen peroxide as a hydroxylating agent ammonium bicarbonate as an additive,and the reactions were conveniently performed in water at room temperature.The method shows an excellent tolerance of functional groups,so it will find a wide variety of applications in academic and industrial research.     

Demonstration and operation of quantum harmonic oscillators in an AlGaAs-GaAs heterostructure

Frontiers of Physics - Nonreciprocal microwave devices, in which the transmission of waves is non-symmetric between two ports, are indispensable for the manipulation of information processing and...     

Electrically Detaching Behavior and Mechanism of Ionic Conductive Adhesives

Design of rapidly detachable adhesives with high initial bonding strength is of great significance but it is full of great challenge. Here,we report the fast electrically detaching behavior(100% detaching efficiency in just 1 min under dozens of DC voltage) and high initial bonding strength(>12 MPa) of epoxy-based ionic conductive adhesives(ICAs). The epoxy-based ICAs are fabricated by introducing polyethylene glycol dimethyl ether(PEGDE) and 1-ethyl-3-methylimidazolium trifluoromethanesulfon...