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简介：Athermoelectricitylightsourceinagaseousplasmadischargebetweentwoelectrodesisdescribed,oneofwhichemitselectronsthermoionically.Theanalyticalmodeldescribingbasicphysicalphenomenaisdeveloped.Theresultsareexcellentagreementwithsimulatedtest.

简介：InTibet,moreandmoreTibetanfarmersandherdsmenhavestartedtousesolarpowerandmarshgasastheirhouseholdenergysource.Suchcleanandenvironmentallyfriendlyenergiesbringaneweratothehighland.Asiswellknown,theQinghai-TibetPlateauistheclosestlandtothesunbeinglocatedata

简介：Studiesonterahertz(THz)radiationandfunctionadeviceshavedrawnincreasingattentionduetotheirapplicationsinbiologicalimagingandsensingnondestructiveevaluation,nationalsecurity,spectroscopyandhighspeedcommunication.TunableTHzsourcesbasedondifferencefrequencyorparametricoscillationgenerationarehighlyefficientandreliablefortheseapplications

简介：AnewDirectionOfArrival(DOA)estimationalgorithmforwidebandsourcesbasedonUniformCircularArray(UCA)ispresentedviaanalyzingwidebandperformanceofthegeneralESPRIT.ThealgorithmeffectivelyimprovesthewidebandperformanceofESPRITbasedontheinterpolationprincipiumandUCA-ESPRIT.Thesimulatedresultsbycomputerdemonstrateitsefficiency.

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简介：日本学者小泉顺子在泰国国家档案馆发现了20世纪早期关于客家的一些重要资料。在本文中，小泉顺子通过对这些资料的介绍和分析，向读者说明了客家在泰国和东亚、东南亚社会中比起其它族群（如潮州、广府），虽然人数相对较少，却扮演着十分重要的角色。

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简介：Theterahertzwaveisconsideredtohavegreatvaluesandplentifulapplications,suchasinmaterialscience,analysisofmolecularspectra,informationandcommunicationtechnology,biologyandmedicalscience,nondestructiveevaluation,andnationalsecurity.High-powerwidelytunableterahertzsourcesarerequiredintheabovepracticalapplicationsofterahertztechnologies.Apromisingapproachformonochromaticterahertzgenerationisbasedonsecond-ordernonlinearopticaleffect,

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简介：Poorpalatabilityisalimitingfactorforreplacingfishmealwithotherproteinsourcesinaquaculture.Thewater-solublemoleculeswithlowmolecularweightsarethemajordeterminantsofthepalatabilityofdiets.Thepresentstudywasconductedtoinvestigatethepalatabilityofwater-solubleextractsfromsingleproteinsource（singleextractpellets）andthemixtureoftheseextractswithdifferentproportions（blendedextractpellets）injuvenileturbot（Scophthalmusmaximus）.Thenaccordingtothepalatabilityofblendedextractpellets,anoptimalmixtureproportionwasselected,andanewproteinsourcemadefromrawproteinmaterialswiththeselectedproportionwasformulatedtoreplacefishmeal.Summarily,thepalatabilityofsingleextractpelletsforturbotwasdescendentfromfishmealtopet-foodgradepoultryby-productmeal,wheatglutenmeal,soybeanmeal,peanutmeal,meatandbonemeal,andcornglutenmeal.Subsequently,accordingtothepalatabilityofsingleextractpellets,52kindsofblendedextractpelletsweredesignedtotesttheirpalatability.Theresultsshowedthatthepelletspresentedremarkablydifferentpalatability,andtheoptimalonewasdiet52（wheatglutenmeal:pet-foodgradepoultryby-productmeal:meatandbonemeal:cornglutenmeal=1:6:1:2）.Thehighestingestionratio（thenumberofpelletsingested/thenumberofpelletsfed）was0.73±0.03,whichwasobservedinDiet52.Thenfiveisonitrogenous（52%crudeprotein）andisocaloric(20kJg-1grossenergy)dietswereformulatedbyreplacing0（control）,35%,50%,65%and80%offishmealwithNo.52blendingproportion.Aftera10-weeksfeedingtrial,aconsistentfeedintakewasfoundamongallreplacementtreatments.Replacementleveloffishmealupto35%didnotsignificantlyinfluencefinalbodyweight,specificgrowthrate,feedefficiencyratio,andproteinefficiencyratioofturbot.Therefore,thewater-solubleextractsofproteinsourcesplayanimportantroleinimprovingthepala

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简介：Threetypesofplasmaionsourcesdesigned,manufacturedandoptimizedintheAcceleratorsandIonSourcesDepartment,NuclearResearchCenter,AtomicEnergyAuthorityareintroduced.Differentmeanswereinvestigatedtogeneratethedischargecurrentandionbeamcurrentextractedfromtheplasma.ThevariousplasmasdescribedincludeaDCglowdischargeplasma,anarcdischargeplasmaandaradiofrequencydischargeplasma.

简介：技术上导致的表面波浪的变细理论上并且试验性地被学习。在这篇论文，地面颤动的十九大小包括交通、振动、冲动的构造工作或堆积开车，爆炸，榔头推动和质量掉的道路和栏杆由八不同技术来源导致了被描述，并且技术上导致的地面颤动展出幂定律变细v锝?r，这被显示出?代表q在0.5～2.0的范围并且依靠消息提供者的q打字。执行的比较比理论上期望证明测量代表更加高。地面颤动变细上的一些潜在的效果理论上被分析。最重要的效果由于材料或散布抑制。每个频率部件作为exp指数地被稀释(?kr)，要不是宽带刺激，指数的法律的和也产出一条幂定律但是与一个高代表。另外的效果被讨论，例如瑞利的分散由于土壤layering飘动，它在冲动的装载的情况下产出0.5的一个另外的代表。关键词波浪变细-环境颤动-地测试-抑制的材料-散布抑制-瑞利波浪

简介：目的：比较不同产地艾叶挥发性成分，为艾叶的质量标准提供化学依据。方法：以五个产地的艾叶为原料，采用水蒸气蒸馏法提取挥发油，应用气相色谱．质谱联用（Chromatography-massSpectrometer,GC-MS）技术对其化学成分进行鉴定，并进行半定量计算。结果：湖北蕲春和河北安国艾叶含多种挥发油成分，且各成分之间实际含量分布较均匀。结论：不同产地艾叶所含挥发油种类的多少及实际含量是不同的。

简介：ThepaperpresentssomepreliminaryresultsofPSSperformancesmeasuredbyusingvariousexcitingsources.Theenergyresolutionof25eVforMnKαandof-15eVforTiKαisobtained.respectively,forvariousexcitingsources,thesatellitestructureofSiKαhasbeenclearlyobserved.ThepeakofCrKβandofMnKαinastainlesssteelsamplehasalsobeenresolvedandthedetectableamountofTihasbeenlessthan10^-9g.ThecomparisonsoftheseresultsattempttofindmoresuitableexcitingsourceforadifferentapplicationofPSSandtodiscussthepossibilityofapplicationcarriedoutbyPSScombinedwithanewμ-X-rayexcitingsource.

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简介：Theproblemofbearingestimationofcoherentsignalimpingiogonanarrayofarbitrarygeometryisstudied.Bothapproachesaredeveloped,thefirstonesynthesizestheobservedarraydataintotheoutputsofalinearuniformarrayandthenprocessesthemviaconventionaltechniquessuchasspatialsmoothingetc.Thesecondapproachisbasedontheinvariantsubspacerotationoperationwhichisequivalenttothetranslationaldisplacementoftheartay,linearlyindependentsignalvectorsareobtainedtherebytospanperfectlythesignalsubspace.Ascomparedwiththeconventionalprocessingtechniques,theapproachbasedoninvariantsubspacerotationdoesnotleadtoaneffectivedecreaseinaperturesizeandthereforeadecreaseinresolutioncapability.Thecomputersimulationsareconductedtodemonstratetheeffectivenessofthepresentedapproaches.