简介:Thispaperpresentstheprincipleofphasemodulationoftheopticalwave,thatisusingadensefringefamilytomodulateanotherfringepattern,anditsapplicationinfringemultiplication.Itisofuniversalsignificanceinopticallyexperimentalmechanics.
简介:以邻菲罗啉(Phen)和邻氨基苯磺酸为配体,与硝酸镍利用水热合成法合成标题配合物{[Ni(Phen)3]·L·(OH)}(L=邻氨基苯磺酸阴离子).通过红外光谱和元素分析对标题配合物进行结构表征,X-射线单晶衍射结果表明,标题配合物的分子式为:C42H31O4N7SNi,Mr=788,属单斜晶系,空间群为C2/c,晶胞参数:a=23.119(A),b=15.792(A),c=25.040(A),β=111.2.,V=8523.3(A)3,Z=8,R1=0.0808,ωR2=0.2447.标题配合物由一个配阳离子[Ni(Phen)3]2+,一个邻氨基苯磺酸阴离子和一个氢氧根离子组成.在配阳离子中,中心Ni(Ⅱ)与三个phen分子的六个氮原子配位,形成六配位的八面体构型.配阳离子通过静电引力与阴离子结合.化合物分子间通过氢键和Phen环π-π堆积作用形成三维结构.
简介:采用沉淀-水热法制备Co(OH)2/C复合材料.通过TG-DSC、XRD和显微镜照片分析材料的组成、结构和形貌,通过循环充放电研究材料的循环性能,分析充放电曲线、微分容量曲线和交流阻抗探讨材料的嵌/脱锂机理.结果表明:Co(OH)2/C复合材料首次可逆比容量达617mAh/g,循环效率为84.4%;20次循环后,Co(OH)2/C复合材料可逆比容量仍有298mAh/g,循环效率为96.4%,容量保持率为48.3%,而Co(OH)2材料分别只有244mAh/g、94.0%和38.0%,石墨可有效改善材料的循环性能.
简介:Inrecentyears,theassessmentofproprioceptivefunctionhasreceivedincreasedattentioninclinicalandmotorskillresearch.Thisisnotsurprisinggiventhegrowingbodyofscientificevidenceontheimportanceofproprioceptiveinformationforcontrollingnearlyallfacetsofhumanmovement;fromstandingtoperforminghighlyskilledmovementpatterns
简介:WehavecarefullyreadDr.Yuandhiscolleagues'~1reviewonthemechanismofhamstringmusclestraininjuryinsprinting.Thereisnodoubtthattheyhavedonealotworkinthisfield.Theirviewsarebasedon3piecesofevidence.First,observationsfrominsituanimalmodelssuggestthatmusclestraininjuriesarehighlyassociatedwitheccentriccontractions.Second,themagnitudeofmusclestrain,ratherthantheforce,is
简介:Deareditor,Intheircomment,Kreweretal.1arguethatbeforeselectingaspecificmethodforassessingproprioception,itisessentialtoconsiderwhichcomponentofproprioceptionistobeassessed.Theyalsonotethatthereisnosinglemethodforassessingallaspectsofthevariousproprioceptivesenses,becausetheneurophysiologicalprocessesunderlyingproprioceptivefunction