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500 个结果
  • 简介:【摘要】目的:探讨扑热息痛新剂型制备中采用超临界溶剂技术的临床效果。方法:运用超临界溶析技术对扑热息痛 -甜菜碱共晶进行制备,并且对过程参数对扑热息痛 -甜菜碱共晶的形貌、粒径以及包封率等性质影响进行探讨。结果:过程参数影响扑热息痛微球包封率的主次因素分别为: VR;粒径和 SEM分析结果显示,扑热息痛包载微球具有较好的分散性,且表面光滑;同时,经体外释放试验,结果显示 SAS技术制备的微球可以发挥肠溶缓解效果,且 SAS包载药物具有较高的稳定性。结论:运用超临界溶剂技术对扑热息痛新剂型进行制备可以获得较好效果,值得推广。

  • 标签: 扑热息痛 超临界反溶剂技术 甜菜碱
  • 简介:存储领域的磁盘介质是最关键的设备,所有数据和信息都要存放在磁盘介质上。而数据的读取速度则是由磁盘介质的连接接口决定的。以往我们都是通过SCSI或者SATA接口及硬盘来完成数据存储工作。不过近些年一个新型技术越来越得到中小企业甚至是大型企业的青睐。就是SAS技术以及与之相对应的SAS硬盘。今天我们就从无到有的来了解一下什么是SAS技术以及使用SAS硬盘的优势。

  • 标签: SAS 硬盘 技术 数据存储 SATA SCSI
  • 简介:为了降低ε型六硝基六氮杂异伍兹烷(ε-HNIW)的感度,提出了一种以液态CO2作为溶剂的新的包覆方法,该包覆方法解决了水悬浮法对溶剂的选择局限性大的问题。对ε-HNIW包覆前后进行SEM、XRD和FT-IR分析,研究表明:选用这种新的包覆方法,氟橡胶、ESTANE和EPDM包覆剂能均匀包覆于ε-HNIW的表面;偶极矩-极性大的包覆剂溶剂使ε-HNIW包覆后转变为α-HNIW晶体;随着包覆剂添加量的增加、或系统压力的降低、或温度的升高,ε-HNIW复合颗粒的分散性越差,球形造型粉颗粒度越好。对ε-HNIW包覆前后进行撞击感度测试表明,相同包覆剂添加量情况下,3种包覆剂降低ε-HNIW感度的大小顺序为:ESTANE〉FE26〉EPDM。

  • 标签: ε型六硝基六氮杂异伍兹烷 液态CO2 包覆工艺 偶极矩
  • 简介:炸药经微粉化处理后具有很多优良的性能,炸药微粉技术已成为当今炸药研究的一个重要趋势。针对我国当前在该领域研究的落后现状,提出并研究了基于超临界溶剂过程(SAS)的炸药微粉制备技术。分析了制备的原理和工艺过程,并建设了两套实验制备装置。研究结果表明,该技术可以满足对炸药微粉的多种特性要求,具有深入研究和推广的价值。

  • 标签: 超临界流体 制备工艺 炸药微粉 超临界反溶剂过程
  • 简介:棉花纤维素动态地处于亚andsupercritical状态与乙醇被提取。变换的度是95.4%,当棉花纤维素non-isothermally从20与乙醇被提取时,摘录收益是55.2%吗??

  • 标签: CELLULOSE ETHANOL SUPERCRITICAL fluid EXTRACTION Thermal
  • 简介:Acombustionmodelofalarge-scalesupercriticalcirculatingfluidizedbed(CFB)boilerwasdevelopedforcomprehensivecomputational-fluid-dynamicsanalysis.Themodelincorporatesgas-solidhydrodynamics,coalcombustion,heattransferonheatexchangesurfacesinthefurnace,andheattransferbetweenfumaceandworkingmediumintheheattransfertubes.Insimulatingthedenseanddilutephasesinthefumace,thegas-solidhydrodynamicsisbasedontheEuler-Eulermodelandenergy-minimizationmultiscaledragmodel.Coalcombustionentailsevaporation,devolatilization,charcombustion,gashomogeneousreaction,andpollutantemission.Thecoefficientofheattransferbetweengas-solidandthewaterwallisestimatedusingtheclusterrenewalmodel,andforradiation,thediscreteordinatemodelisused.Moreover,thermohydraulicprocessesinthemembranewallarealsoineludedintheheattransferprocess.Themodelwassuccessfullyappliedinsimulationsofa350-MWsupercriticalCFBboiler.Detaileddistributionsofsolidsconcentration,oxygen,heatflux,andworkingmediumtemperatureintheboilerfurnacearepresented.

  • 标签: COMPREHENSIVE combustion model COMPUTATIONAL fluid dynamic
  • 简介:Supercriticalwaterreactor(SCWR)wasproposedasaGenerationⅣconceptforbuildinglargecapacitynuclearpowerplants.ComparingwiththepresentGenerationⅡandⅢlightwaterreactors,SCWRpossessesgreatadvantagesof10%higherefficiency,simplersystemdesign,bettersustainability,andsoon.However,theselectionofmaterialsforfuelcladdingandreactorinternalsofSCWRisfacingagreatchallenge.Corrosioninsupercriticalsteamisofthefirstimportantissuetobesolvedtomeetthestringentrequirementofthereactorinternalcomponents.Corrosionscreeningtestswereconductedoncandidatematerialsfornuclearfuelcladdingandreactorinternalsofsupercriticalwaterreactor(SCWR)instaticandre-circulatingautoclaveatthetemperaturesof550,600and650℃,pressureofabout25MPa,deaeratedorsaturateddissolvedhydrogen(STP).NickelbasealloytypeHastelloyC276,austeniticstainlesssteelstype304NG,AL-6XN,HR3C.NF709andSAVE25,ferritic/martensitic(F/M)steeltypeP92,P122and410,andoxidedispersionstrengthenedsteelMA956,aretested.Thispaperpresentscorrosionrate,andfocusesontheformationandbreakdownofcorrosionoxidefilm,andproposesthefuturetrendforthedevelopmentofSCWRinternalstructurematerials.

  • 标签:
  • 简介:Theunit5ofHuangdaoPowerPlantwhichwasfinancedandbuiltbyQingdaoGuoxinIndustrialCo.,Ltd.carriedout168-hourtrialoperationonOctober24.Itsloadfactorreachedover98%.Alltheindexesoftrialoperationwereexcellent.Atpresent,theunitisinoperationundertheconditionsoffullprotection,fullautomationandfullload.

  • 标签: 中国 电力建设 自动化 超临界电压
  • 简介:建立了一套连续的超临界溶剂实验装置。以无机物BaCl2和NH4Cl、DMSO(二甲基亚砜)及二氧化碳物系为研究对象,利用超临界溶剂过程制备了BaCl2和NH4Cl超细颗粒,并将其结果与文献进行了比较。结果表明,利用此装置制备超细颗粒是可行的。同时实验研究了不同压力,温度及溶液浓度、溶液流量对结晶颗粒形貌与尺寸的影响。

  • 标签: 超临界反溶剂过程 超细颗粒 BACL2 NH4CL 结晶颗粒 形貌
  • 简介:Thestudyonretentionbehaviorinsupercriticalfluidchromatography(SFC)isnecessarytounderstandthemechanismofthevariousinteractionsinSFC.TheretentionofSFCincarboxylicacidmethylester/polymethylsiloxane/CO2systemwasstudiedsystematicallyandtheretentionbehaviorofthiskindofcompoundsundervarioustypicaloperationconditionswasdescribedusingthemethodofanalternativeunifiedtheoryofchromatographicretention.Theresultsillustratedthatexpression:Ink.=a+b/T+cp+dp/T+ep2/Tcanbeusedtodescribequantitativelytheretentionbehaviorofcarboxylicacidmethylester/polymethylsiloxane/CO2systemintherangesofreduceddensityfrom0.549to1.411.Itwasalsofoundthattheentropyofsoluteinstationaryphaseisdependentonthedensityofsupercriticalfluid(SF)undertypicaloperatingconditionsofSFC.

  • 标签: SUPERCRITICAL fluid chromatography (SFC) RETENTION behaviour
  • 简介:【摘要】在传统的技术条件下,化学制药过程中存在诸多污染问题。特别是一些有毒、有害有机溶剂的使用,一旦处理不当,就会带来严重的环境污染和威胁人的身体健康。随着经济发展与科技进步,人们开展关注制药污染问题,对化学制药提出了绿色化的要求。在这种背景下,绿色溶剂和无溶剂合成技术将会得到大力推广与应用,通过利用这两种技术不断提升反应物化学反应速率,减少污染物质的产生,以及节约能源和成本。

  • 标签: 化学制药 绿色溶剂 无溶剂 绿色化学
  • 简介:Fortwotrianglestobecongruent,SAStheoremrequirestwosidesandtheincludedangleofthefirsttriangletobecongruenttothecorrespondingtwosidesandincludedangleofthesecondtriangle.Ifthecongruentanglesarenotbetweenthecorrespondingcongruentsides,thensuchtrianglescouldbedifferent.Itturnsoutthatitispossibletodescribefourcasesinwhichtrianglesarecongruenteventhoughcongruentangles.Fortwotrianglestobecongruent,SAStheoremrequirestwosidesandtheincludedangleofthefirsttriangletobecongruenttothecorrespondingtwosidesandincludedangleofthesecondtriangle.Ifthecongruentanglesarenotbetweenthecorrespondingcongruentsides,thensuchtrianglescouldbedifferent.Itturnsoutthatitispossibletodescribefourcasesinwhichtrianglesarecongruenteventhoughcongruentanglesarenotbetweenthecorrespondingcongruentsides.Suchatheoremcouldbenamed,forexample,SSAtheorem.ManytextsstatethattwotrianglescannotbeshowntobecongruentiftheconditionofSSAexists.However,theauthordescribescasesinwhichsuchtrianglescouldbeprovencongruentwiththeSSAtheorem.Animmediateconsequenceofthisnewunderstandingisthenecessityofrevisingmanyproblemsandanswersinhighschoolandcollege-leveltextsrelatedtocongruenttriangles.arenotbetweenthecorrespondingcongruentsides.Suchatheoremcouldbenamed,forexample,SSAtheorem.Animmediateconsequenceofthisnewunderstandingisthenecessityofrevisingmanyproblemsandanswersinhighschoolandcollege-leveltextsrelatedtocongruenttriangles.

  • 标签: CONGRUENT TRIANGLES a theorem a proof
  • 简介:阴极电泳漆虽然属于水性漆,但仍含有少量的有机溶剂。有机溶剂的存在既可以提高漆液的溶解效果,也可以提高漆膜的流平性,使漆膜外观平整光滑。但有机溶剂易挥发,价格较贵,由于电泳槽排风量较大,在正常生产过程中需要补充一定量的有机溶剂,因此对于溶剂含量高的阴极电泳漆品种就需补充适当的有机溶剂,若不及时补充,

  • 标签: 含量测定 阴极电泳漆 溶剂含量 烘干减量
  • 简介:通过与干法复合等复合工艺的对比,比较详细地阐述了无溶剂复合的主要优点,介绍了国内外无溶剂复合的现状,分析了影响我国无溶剂复合应用的因素以及当前推广应用无溶剂复合的有利条件,指出在我国推广、应用无溶剂复合是一项任重而道远的工作。

  • 标签: 无溶剂复合 节约资源 节约能源 环境保护
  • 简介:Asolventdissolvesothermaterials.Waterisagoodsolventbecauseitisabletodissolvemanymaterials.Watercandissolvesugar,salt,andotherfoods.Asyoulearnedearlier,blood,whichismostlywater,isadeliverysystemfornutrientsinthebody.

  • 标签: MATERIALS WATER SOLVENT dissolve