简介:Basedupontheformationandevolutionofoasisandthefactorsrestrictingthecoordinateddevelopmentofoasiseconomyandenvironment,thispaperpresentsagoalofthedevelopmentincoordination.Itsuggeststhatthesustainablesurvivalanddevelopmentofoasiscouldbeensuredonlyiftheoasis-desertandwatersourceecologyaremanagedinacombinedwaytoformamacrosystem.Inlightwiththeabovementioned,theapproachtothedevelopmentofeconomyandenvironmentofoasisinaridareashoulddependupontheestablishmentofanoasisecologicalandeconomicsystem,whichsuitsthearidenvironmentandpromotestheefficiencyofresourceconfiguration,stabilizeseconomicincrementandbenefitsecologicaldevelopment.
简介:HexiCorridorisoneofthemostpotentialareasintheChina’sWesternDevelopmentin21stcentury.However,theproblems-thesustainabledevelopmentofoasisagriculture,theecosystemoftheoasisedge,thelandscapestructure,thepopulationdensityinoasis,waterresourcesandlandresourcesinoasisaredeterioratingandhaverestrictedthesustainabledevelopmentofsocietyandeconomyinthisarea.Thispapersummarizestheproblemsatpresent,andputsforwardtheconceptofprotectingandconstructingtheoasisenvironmentandsustainabledevelopmentforthesustainabledevelopmentoftheoasisagricultureintheHexiCorridor.
简介:“Ejin节”在调查的EjinOasiswas在一个典型盖住植被的沙丘发现了。在这研究,263件样品为谷物尺寸分析从节被拿,25for化学药品分析,11为~(14)标明日期的C并且6为扫描电子显微镜(SEM)。学习的Theresults显示在节的沉积的3种类型能被识别,YS,LSand圣伊斯,同类的黄褐的沙丘沙,等于内陆沙漠的那些,LS,像黄土的砂土,与在中间的沙的黄土一样黄河和现代掉落灰尘,和圣,沙的沉积内部有Tamarixspp的枯枝和落叶的beded,代表突然的变化在气候打断的节的depositional过程。自从2500年BP和灰尘暴风雨的高峰时期,TheEjin节记录了重复灰尘暴风雨或沙暴或节揭示的沙暴在历史的文学与“灰尘雨”的记录一致,显示气候的变化是增加沙暴或灰尘暴风雨的一个关键因素,而,“人工”的因素可以仅仅是加速的fordesertification。
简介:Basedonlongtermandstationaryresearch,thetemporalandspatialpatternsanddynamiclawsofsoilwatercontentinMinqindesertareawerestudied.Someresultsareasfollows:(1)ThechangeofsoilwatercontentindifferentyearsisnotobviouslyinshrubsandduneofNitrariasibiricaandTamarixramosissima,butitwasgreatinshiftingsanddune,themaximumis2.538%;(2)Theseasondynamicscanbedividedintothreestages:accumulating,consumingandstable;(3)Theverticalchangeofsoilwa...
简介:Thepaperresearchesonthepatternofman-landrelationshipofartificialoasisintheeastofnorthTian-shanMountain,thedevelopmentofQitaiartificialoasisanditsrelationshipwithenvironment,analyzesthefactorsin?uencingthechangeofQitaiartificialoasisandeconomicgrowththroughgreyanalysis,andsuggeststheap-proachesofsustainabledevelopmentofQitaiartificialoasis.Researchshowsthatthepatternofartificialoasisanditsenvironmenthadgonethroughthreephases:therelativelyharmoniousstage,theunharmoniousstage,andthenewfragilebalancestage.Italsoshowsthatthegardenandtheshelter-forestareusefultothesustainabledevelop-mentofQitaioasisaccordingtogreyanalysis.
简介:摘要:建立了Oasis PRiME HLB固相萃取柱净化后,经超高效液相色谱串联-质谱测定动物源性食品中克伦特罗、莱克多巴胺、沙丁胺醇、特布他林、西马特罗、非诺特罗、氯丙那林、妥布特罗、喷布特罗9种β-兴奋剂类药物的检测方法。本方法前处理简便、净化效果好,检测结果准确度高,适用于动物源性食品中β-兴奋剂的定性定量检测。
简介:摘要目的比较重症监护病房(ICU)脓毒症患者牛津急性疾病严重程度评分(OASIS)和简化急性生理学评分Ⅱ(SAPSⅡ)对院内死亡的预测价值。方法使用美国重症监护医学信息数据库Ⅳ0.4(MIMIC-Ⅳ0.4)中的数据进行回顾性队列研究。以脓毒症3.0诊断标准为筛选条件,提取数据库中有感染且入ICU 24 h内序贯器官衰竭评分(SOFA)≥2分的首次入院的ICU成人脓毒症患者的基本信息,包括性别、年龄,是否使用血管活性药物、镇静药物、机械通气、肾脏替代治疗,ICU住院时间,以及OASIS、SAPSⅡ评分等。以院内死亡为主要结局指标,绘制受试者工作特征曲线(ROC曲线),并计算ROC曲线下面积(AUC),比较OASIS与SAPSⅡ评分对预后的预测价值。结果共有11 098例ICU成人脓毒症患者被纳入最终分析,其中院内死亡2 320例,存活8 778例,院内病死率为20.90%。与存活患者相比,院内死亡患者年龄更大〔岁:71(60,81)比67(56,78)〕,ICU住院时间更长〔d:6.95(3.39,13.07)比4.23(2.19,9.73)〕,使用血管活性药物、镇静药物、机械通气、肾脏替代治疗的比例更高〔血管活性药物:50.65%(1 175/2 320)比33.05%(2 901/8 778),镇静药物:58.53%(1 358/2 320)比48.41%(4 249/8 778),机械通气:89.57%(2 078/2 320)比81.66%(7 168/8 778),肾脏替代治疗:11.98%(278/2 320)比6.57%(577/8 778),均P<0.01〕,且院内死亡患者有更高的OASIS评分〔分:43(36,49)比35(29,41),P<0.01〕和SAPSⅡ评分〔分:49(40,60)比38(31,47),P<0.01〕。ROC曲线分析显示,OASIS与SAPSⅡ评分预测ICU成人脓毒症患者院内死亡的AUC分别为0.713〔95%可信区间(95%CI)为0.701~0.725〕和0.716(95%CI为0.704~0.728),Delong检验显示二者的AUC比较差异无统计学意义(P>0.05)。结论OASIS评分对脓毒症患者院内死亡具有良好的预测价值,且与SAPSⅡ评分的预测能力相仿,说明比SAPSⅡ评分更加简便的OASIS评分有更广阔的临床应用前景。