简介:Modelingandreasoningondomaincontextsplayakeyroleforaddingintelligencetocommunicationservices,andtheapproachofcapability-basedrequirementengineeringensuresthescientificityandaccuracyofrequirementelicitation.Thispaperpresentsacapability-basedcontextontologymodelingapproachforcommandandcontrol,communication,computer,intelligence,surveillanceandreconnaissance(C4ISR)communication.Primarily,acapability-basedC~4ISRcommunicationmeta-conceptmodelandaC~4ISRcommunicationcontextmeta-ontologyareconstructed.ThecontextontologyisestablishedundertheconstraintsoftheC~4ISRcommunicationcontextmeta-ontology,andfurthermore,algorithmsareproposedtosupportcontextreasoningbasedondescriptionlogic.Acasestudyispresentedtodemonstrateapplicabilityoftheproposedmethod.
简介:摘要:本文建立温度对C4烯烃选择性和乙醇转化率的一元线性回归模型,并通过其散点图观察当温度升高时各指标的变化趋势。首先,分别对每组实验温度与C4烯烃选择性和乙醇转化率的相关系数进行计算,得出每组实验均有,本文认为温度与C4烯烃选择性和乙醇转化率具有极强的相关性。然后对温度与各项指标的散点图进行线性与非线性拟合,通过计算不同拟合曲线的相关系数,最终得出C4烯烃选择性和乙醇转化率与温度均有较强的二次正相关性。
简介:摘要目的探讨干扰素-α(IFN-α)对慢性乙型病毒性肝炎(chronichepatitisB,CHB)患者的临床疗效以及对血清补体C3、C4水平的影响。方法选取CHB患者108例,检测血清谷丙转氨酶(ALT)大于8Ou/L,HBsAg阳性,HBeAg阳性,HBV-DNA(PCR法)大于1O5拷贝/mL,随机分为治疗组和对照组。治疗组采用IFN-α加常规护肝降酶药治疗,对照组仅采用单一常规护肝降酶药治疗,疗程均为12个月,观察患者症状、肝功能、乙肝病毒标志物、HBV-DNA水平、补体C3、C4水平等指标。结果治疗组的ALT正常化率、HBeAg转阴率或转换率、HBV-DNA转阴率分别为75.00%、57.69%、48.08%,均明显高于对照组(分别为56.60%、24.53%、22.64%),有显著统计学意义(P<0.05)。治疗组患者血清补体C3、C4水平(分别为1.16±0.21g/L、0.26±0.12g/L)较对照组(分别为0.93±0.20g/L、0.18±0.11g/L)明显升高,有显著统计学意义(P<0.01)。结论IFN-α抗病毒效果好,是目前治疗慢性活动性乙型肝炎安全有效的方法之一,血清补体C3、C4的水平变化可为预后提供一定的参考价值。
简介:Theabinitiomolecularorbitalmethodisemployedtostudytheenantioselectivereductionofacetophenonewithboranecatalyzedbythiszolidino[3,4-c]oxazaborolidine.Computationresultshowsthatthecontrollingstepforthereductionisthedecompositionofthecatalyst-alkoxyboraneadductandthereductionleadstoS-alcohols.ThetransitionatateofthehydridetransferfromtheboranemoietytothecarbonylcarbonofacetophenoneisatwistedchairstructurewithaB(2)-N(3)-BBH3-HBH3-CCo-OCO6-memberedring.
简介:Carbon-coatedlithiummanganesesilicate(Li2MnSiO4/C)nanoparticlesweresynthesizedbypolyolprocess.X-raydiffraction(XRD)patternsoftheobtainedmaterialsexhibitagoodfitwiththatoftheLi2MnSiO4phase.Fieldemissionscanningelectronmicroscopy(FESEM)imagesoftheobtainedsamplesshowthattheparticlesizeisonlytensofnanometers.Thehighresolutiontransmissionelectronmicroscopy(HRTEM)analysisshowsthattheLi2MnSiO4nanoparticlesaresurroundedbyaverythinfilmofamorphouscarbon.Thecompositepreparedthroughpolyolprocessshowsgoodperformanceascathodematerialsinlithiumcellsatroomtemperature.ThechargecapacityoftheLi2MnSiO4/Csamplesis219mAh/g(about1.3Li+perunitformulaextracted),andthedischargecapacityis132mAh/g(about0.8Li+perunitformulainserted)inthefirstcycleinthevoltagerangeof1.5-4.8V.Agoodcapacitycyclingmaintenanceof81.8%after10cycleswasobtained.
简介:工程建设是房地产开发的重要环节,而开发商对工程建设的业主管理水平较低。针对这一现状,提出了一套基于项目管理思想与组织设计、行为控制、组织文化等管理理论的“4W2C”管理模型。模型包括环境分析、任务分解、组织结构设计、管理制度制定、团队文化建设与控制纠偏,进而介绍了模型在某房地产项目的应用。模型为房地产开发商在工程建设前期与实施期间,实现业主管理的专业化提供了思路。