日光温室地埋管道温度场影响因素研究-基于Fluent     

董蓬  吕全贵  陈青云  张振国  许红军  姚亮 《农机化研究》2015,(10):239-244

目前,越来越多的日光温室作业者通过在温室土壤中铺设热水循环地埋管道的方式来为温室夜间生产供热。为了了解温室地埋管道温度场的影响因素,运用GAMBIT建立土壤中不同直径的地埋管道二维网格模型,并采用Fluent软件模拟地埋管在冬季夜间环境下周围土壤温度场的变化。在网格模型中选取监测点,通过观测监测点温度了解埋管结构参数与土壤温度场的关系,为今后温室地埋管的埋设提供参考。  相似文献   

Isolation and Identification of BPIV3 Genotype C     

RAN Xu-hua  ZHANG Yao  CAO Si  LU Yuan-he  ZHANG Ling-ling  LIU Yang-yang  NI Hong-bo  ZHU Zhan-bo  WEN Xiao-bo 《中国畜牧兽医》2016,43(5):1368-1373

To identify the infection agents from Ningxia Hui Autonomous region, where feedlot cattle indicated bovine respiratory disease complex (BRDC), the M gene of the bovine parainfluenza virus type 3 was amplified by RT-PCR.The PCR product was ligated to pMD18-T vector and cloned to E.coli DH5α.The positive clones were sequenced and compared with the reference strains in GenBank by the molecular biology software.Sequence alignment results showed that a BPIV3 strain was isolated from the samples and named NX49, the M gene of NX49 included 1 056 nucleotides.Evolutionary analysis showed that the NX49 belonged to BPIV3 C genotype and shared 99.4% nucleotide identity with that of the SD0835 isolated in Shandong province.The characterization of the NX49 demonstrated that it was sensitive to temperature, acid and organic matter.The presence of Mg²⁺ showed no protection against the treatment at high temperature.The HA test suggested that the NX49 enables to agglutinate the guinea pig RBC at 4 ℃ and the titer was 1∶4.The study isolated a BPIV3 genotype C strain successfully, which facilitate the study of molecular evolution and epidemiology of BPIV3 in China.  相似文献   

Isolation and Identification of Pathogenic Bacteria Causing Dairy Cow Mastitis in Liaoning and Drug Sensibility Test of Pathogenic E.coli     

YAO Wei  YU Xue-wu  CAO Dong  ZHAO Xiao-tong  GU Gui-bo  CHEN Yao  ZHANG Lei  LIU Yao-chuan  FENG Jun-ke 《中国畜牧兽医》2016,43(11):3080-3084

In order to understand the main bacterial pathogen species causing dairy cow mastitis in Liaoning, as well as the characteristics of drug sensitivity of the pathogenic E.coli,the milk samples from 75 dairy cows with clinical manifestations for mastitis in certain large-scale dairy farm in Liaoning were collected.The bacteria in milk were cultured and isolated with biochemical methods and in vitro drug sensitivity tests were processed with the isolated E.coli strains.The results showed that the main bacterial pathogen for dairy cow mastitis were E.coli（separation rate 58.7%),S.aureus（64.0%）and S.agalactiae（54.7%),and multiple infection including double and triple infection were identified.The drug sensitivity tests on the isolated E.coli indicated that the E.coli isolates were highly resistant to sulfonamides（resistance rate>85%）and chloramphenicol（resistance rate>30%),and they were relatively low resistant to ampicillin（9.5%),ciprofloxacin（9.5%),ceftiofur（7.1%）and ofloxacin（4.8%).The results was able to provide reliable theoretical basis for prevention and control of dairy cow mastitis in Liaoning area.  相似文献   

光源、性别及光处理时间对草地贪夜蛾趋光行为的影响     

张亚南  刘雨欣  李梦瑶  姚梦语  魏国树 《植物保护学报》2023,50(4):1010-1015

为研发高效、精准的监测防控设备,利用八臂行为选择装置系统测定不同光源、性别和光处理时间下草地贪夜蛾Spodoptera frugiperda的趋光行为。结果显示,在紫外光（波长365 nm）、紫光（波长420～430 nm）、蓝光（波长465～475 nm）、绿光（波长525～535 nm）、黄光（波长585～595 nm）和红光（波长655～665 nm）6种波长光源下,草地贪夜蛾混合种群（雌雄成虫比为1∶1）对紫外光光源的趋光选择率最高,为25.61%,显著高于其他处理,其次为紫光和蓝光光源,趋光选择率分别为16.30%和8.82%,对红光的趋光选择率最低,为4.76%。在紫外光刺激下,草地贪夜蛾雌成虫的趋光选择率显著高于混合种群（雌雄成虫比为1∶1）,在红光刺激下,雄成虫的趋光选择率显著高于雌成虫。另外,在紫外光刺激下,光处理时间60 min草地贪夜蛾雌成虫的趋光选择率显著高于其他处理。表明光源与性别因素均影响草地贪夜蛾的趋光行为,光处理时间对草地贪夜蛾的趋光行为影响较小,且与光源及性别因素有关。  相似文献   

覆盖方式对旱地小麦花后旗叶抗氧化生理及粒重形成的影响     

张姚  程宏波  杨佳佳  马建涛  柴守玺  纪文宁  张仕林 《干旱地区农业研究》2023,(4):141-150

于2017—2018年和2018—2019年,在西北中部旱作雨养农业区以冬小麦‘康庄974’为试验材料,设秸秆带状覆盖(SM)、地膜覆盖(PM)和无覆盖对照(CK)共3个栽培处理,分析不同覆盖方式对小麦灌浆期土壤水分和温度及抗氧化能力的影响,探讨花后干物质积累量和粒重形成的关系。结果表明,随生育期推进,花后旗叶相对含水量(RWC)逐渐降低,丙二醛(MDA)含量逐渐升高,且PM较SM降、升幅度明显。与CK相比,覆盖显著提高花后旗叶抗氧化酶活性,增加渗透调节物质含量;开花时间越长,SM抗氧化酶活性升高的幅度越大,而PM主要提高花后7 d旗叶抗氧化能力。SM和PM的粒重分别较CK增加14.3%和19.1%(P<0.05)。相关分析表明,土壤水分(SW)是影响旗叶生理活性的关键因子,提高SW,有利于增加RWC(r=0.84^**),从而提高旗叶抗氧化能力,其中RWC和抗坏血酸酶(ASA)活性呈极显著正相关关系(r=0.82^**);ASA活性和脯氨酸(Pro)含量呈极显著正相关关系(r=0.94^**),和MDA含量呈极显著负相...  相似文献   

Flavonoid production in tomato mediates both direct and indirect plant defences against whiteflies in tritrophic interactions     

Fengbo Yang  Haowei Shen  Tianyu Huang  Qixi Yao  Jinyu Hu  Juan Tang  Rong Zhang  Hong Tong  Qingjun Wu  Youjun Zhang  Qi Su 《Pest management science》2023,79(11):4644-4654

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草莓产区种苗生产问题调研分析——以江苏省东海县草莓产区为例     

秦豹  李刚  姚红  朱雪原  彭卓  周厚成 《中国果业信息》2023,52(3)

近年草莓种苗质量问题越来越受到行业内的重视,在一些种植年限久、规模大的种植区内尤为明显。本文通过对江苏省东海县草莓产区考察调研,了解近年生产苗使用状况,并对育苗过程中存在的主要问题及原因进行了分析。结果显示,当地外购生产苗占相当比例且来源地广泛,受苗木质量等问题影响,近年首批生产苗定植成活率明显下降;夏季育苗成功率较低,种苗退化及病害问题较为突出,育苗田状况、苗期管理技术等需要进一步提升。文章从保障优质种苗供应、规范提升育苗方法及加强育苗组织化程度等方面提出了相关具体意见措施,以为改善草莓种苗生产供应状况提供参考。  相似文献   

反转录-重组酶介导等温扩增（RT-RAA）快速检测基因2型猪繁殖与呼吸综合征病毒     

陈耀  仲欣雨  吴陈雨  丁雪  黄璟  王欢莉  范忠军  孙静  陈星逸  余树培  夏文龙 《中国动物检疫》2023,40(1):121-127

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双向电液比例张力绞车的直接自适应鲁棒控制     

钟天宇  王庆丰  姚斌 《农业机械学报》2007,38(11):144-148

设计了基于比例溢流阀调压回路的双向电液比例张力绞车,并进行了理论分析。针对液压系统的不确定性因素以及卷绕机构参数变化对张力控制的影响,提出了直接自适应鲁棒电液张力控制方法,并用张力负载模拟试验系统进行了研究。理论分析与试验均表明,对于具有不确定性因素的张力跟踪控制,所设计的电液张力绞车及其控制策略,具有良好的控制性能。  相似文献   

农林生物质原料筛分技术与设备发展现状   总被引：1，自引：0，他引：1  

张妍  赵立欣  郭占斌  杨宏志  孟海波  姚宗路 《农机化研究》2015,(3):243-247,253

针对目前生物质原料中杂质多、筛分设备不匹配等问题,对各类生物质原料进行分类,总结国内外筛分技术的发展现状。同时,通过对杂质的特性分析,针对目前的筛分方法、筛分机械进行相对应的应用,旨在提出一种适合我国生物质成型燃料大规模生产的筛分技术及配套设备,为生物质原料清选工艺提供技术支撑。  相似文献