简介:摘要:棒材全线轧机共18架,分为粗轧、中轧、精轧三个机组,每个机组由6架轧机组成,粗中轧机组呈平、立轧机交替布置,精轧机组呈“平-立-平-平-平-平”布置,利于实现多线切分。精轧机组设6个立式活套,轧件在粗中轧机组中为微张力轧制,在精轧机组中为无张力活套轧制。Φ12螺纹钢筋采用5切分轧制工艺;Φ14、Φ16螺纹钢筋采用4切分轧制工艺;Φ18、Φ20螺纹钢筋采用3切分轧制工艺;Φ22、Φ25螺纹钢筋采用两切分轧制工艺,其它规格螺纹钢及所有规格圆钢为单根轧制。全线轧机采用高刚度短应力线轧机,精轧机组最高轧制速度为15m/s。轧线的设备组成为轧机工作机座、轧机底座、工作机座拉出装置、万向接轴及托架、联合减速机、联轴器等;轧机型式为二辊高刚度短应力线轧机、液压压下对称调辊缝、阻尼体平衡辊系、液压横移轧机工作机座调轧槽、工作机座与底座间通过弹簧机械锁紧液压回松。
简介:摘要: AT9井区丛式井项目是中石化西北分公司首次在塔河油田尝试丛式井组开发技术而布置的两个丛式井平台,其中一号平台共布置 5口水平井,二号平台共布置 2口水平井, 1口定向井, 1口直井。两个平台相距 80m,同台井口彼此间距 8m,平均造斜点在 4000m以上,是国内陆上平均造斜点最深的丛式井组。由于超长直井段,外加方位漂移的不确定性,使得直井段的防碰成为整个项目施工的关键。 AT9-11H井是一号平台的第一口水平井,本文通过其施工过程的详述,探讨了丛式井组钻井技术在该井组应用的难点和重点,对本平台以后井的施工具有指导意义。
简介:Thispaperreportstwolanthanidecomplexesofformula(C9H7)Ln(C8H8)·(THF)2whereLnisProrNd,C9H7isindenyl,andC8H8iscyclooctatetraene(COT).ThecomplexeswerepreparedbythereactionofLnCl3withK(C9H7)andK2(C8H8)inTHF.(C9H7)Pr(C8H8)·(THF)2crystallizesinTHFat-15℃inthemonoclinicspacegroupP21:withunitcelldimensionsa=8.446(0),b=10.083(2),c=13.407(3),β=105.48(1)°,V=1100.43(35)3,Dc=1.52g/cm3andZ=2.ThefinalRvalueis0.033,Rwvalueis0.030,respectively.In(C9H7)Pr(C8H8)·(THF)2afive-memberedringcentroidofC9H7,theC8H8ringcentroidandthetwooxygenatomsfromthetwoTHFmoleculesformadistortedtetrahedralgeometryaroundthemetal.
简介:AbstractWe conducted environmental surveillance to detect avian influenza viruses circulating at live poultry markets (LPMs) and poultry farms in Guangxi Autonomous Region, China, where near the China-Vietnam border. From November through April 2017-2018 and 2018-2019, we collected environmental samples from 14 LPMs, 4 poultry farms, and 5 households with backyard poultry in two counties of Guangxi and tested for avian influenza A, H5, H7, and H9 by real-time reverse transcription-polymerase chain reaction (rRT-PCR). In addition, we conducted four cross-sectional questionnaire surveys among stall owners on biosecurity practices in LPMs of two study sites. Among 16,713 environmental specimens collected and tested, the median weekly positive rate for avian influenza A was 53.6% (range = 33.5% - 66.0%), including 25.2% for H9, 4.9% for H5, and 21.2% for other avian influenza viruses A subtypes, whereas a total of two H7 positive samples were detected. Among the 189 LPM stalls investigated, most stall owners (73.0%) sold chickens and ducks. Therefore, continued surveillance of the avian influenza virus is necessary for detecting and responding to emerging trends in avian influenza virus epidemiology.
简介:本文就n-C4H9-Br制备实验的反应过程以及分别用KBr和NaBr制备n-C4H9-Br时出现的不同实验现象和结果进行了探讨。提出KBr的溶解速率比NaBr的溶解速率小是产生不同实验现象和结果的原因,并通过用块状NaBr进行对比实验得到验证。用块状的NaBr有利于提高n-C4H9-Br的产率。
简介:BackgroundTaxifolin(Tax)isanessentialnaturalantioxidant.MultiplestudieshaveshownthatTaxcanprotectcardiomyocytesfromischemia-reperfusioninjury.However,theunderlyingmechanismisstillunclear.MethodsH9C2cellswererandomlydividedintocontrol,H_2O_2group,Taxpretreatmentgroup(Tax+H_2O_2);Taxeffectgroup.CellactivitywasdetectedbyCCK-8andtheintracellularstructurewasobservedbytransmissionelectronmicroscopy.AutophagywasdeterminebyWesternblottinganalysisofBeclin-1,Bcl-2andPKC.ResultsTaxpretreatmentsignificantlyincreasedanti-apoptoticproteinBcl-2andautophagyproteinBeclin-1.ExpressionofPKCwasinhibitedbyTax.ConclusionsTaxpretreatmentcouldprotectH9C2cellsagainstH_2O_2-induceddamagethroughtheBcl-2andautophagypathways.
简介:摘要目的探讨人感染H7N9禽流感重症患者的护理要点,以提高护理质量。方法回顾性分析总结我院从2017年4月21日至5月19日收治的9例人感染H7N9禽流感重症病例护理经过。结果9例患者中3例给予有创机械通气和俯卧位通气,安置了气管插管、动静脉导管、尿管等,2例给予ECMO治疗;6例无创通气。未发生导管相关性感染及褥疮等;1例患者治疗过程发生严重情绪失控,经心理护理后好转。3例死亡,6例治愈出院。结论严密监测病情,做好各类导管管理及住院期间患者的心理护理,是成功抢救人感染H7N9禽流感重症患者、提高危重患者生存率的重要保障。
简介:AbstractAvian influenza remains a threat to human wellbeing. Hypochlorite derivatives are commonly used as disinfectants to prevent the spread of the disease. The World Health Organization (WHO) has listed chlorine dioxide (ClO2) as an A1-level, safe, and efficient disinfectant. In this study, we tested the efficacy of ClO2, in aqueous solution and gas forms, against avian influenza A (H7N9) virus. The virus suspension was mixed with ClO2 aqueous solutions of various concentrations and for various time intervals. Aliquots of the mixture were then serially diluted, and the 50% tissue culture infective dose (TCID50) was measured with a hemagglutination test on MDCK cells. ClO2 gas produced from generators was introduced in a chamber containing the virus suspension in a Petri dish. The infective activity of the surviving virus was measured by the hemagglutination test. An aqueous solution of ClO2 at 126 µg/mL for 15 s was effective given that no surviving virus was detected with the hemagglutination test. ClO2 gas at >5 µL/L sustained for 1 h inactivated the virus effectively, while at 2.5 µL/L for 1 h, it only partially inactivated the virus. ClO2 as gas or aqueous solution at a certain concentration is effective in inactivating the H7N9 virus, and can be applied for the decontamination and disinfection of environments.