砂梨病虫种群,Pyrus disease and pest population
1)Pyrus disease and pest population砂梨病虫种群
英文短句/例句
1.Disease and Pest Population Dynamics of Pyrus in Wuhan and the Non-polluted Control Techniques砂梨病虫种群动态及其无公害防控技术
2.Studies on the Insects Species in Pear Orchards and the Population Dynamics of Codling Moth and Oriental Fruit Moth in Xinjiang;新疆香梨园昆虫种类与苹果蠹蛾和梨小食心虫的种群动态研究
3.Biological Characters of 13 Introduced Pear Varieties in Zunyi Region13个引进砂梨品种生物学性状评价
4.LDENTIFICATION OF 13 SAMPLES IN PYRUS PYRIFOLIA BY ISSR MOLECULAR MARKER13个砂梨品种的ISSR分子鉴别
5.Effects of Sublethal Dose of Spirodiclofen on the Population Parameters of Tetranychus cinnabarinus Boisduval杀虫剂螨危的亚致死剂量对朱砂叶螨种群参数的影响
6.Research on the Elimination of Latent Viruses in Pyrus Pyrifolia by Thermotherapy and Chemotherapy;物理及化学处理脱除砂梨潜隐病毒研究
7.Research on Fast Detection and Elimination of Major Viruses in Pyrus Pyrifolia;砂梨主要病毒的快速检测及脱除技术研究
8.Study on Characteristics of Sugars, Acids and Stone Cell in Different Sand Pears from Germplasm Resources;砂梨品种资源糖酸及石细胞含量特点的研究
9.Contents and Changes of Organic Acid in Sand Pears from Different Germplasm Resources砂梨品种资源有机酸含量及发育期变化
10.Epidemiology and Control of Piroplasmosis in Dairy in Nanyang City;南阳市奶牛梨形虫病的流行病学调查及防制
11.Study and Control on Several Population of Pathogenic Microsporidian in the Silkworm, Bombyx Mori (Bombycidae, Lepidoptera);家蚕病原性微孢子虫若干种群的研究与控制
12.A Primary Study of Quorum Sensing in Erwinia Amylovora;梨火疫病菌群体感应系统的初步研究
13.Investigating the Pest of Golden-Autumn Pear and Studying about Control Measure;金秋梨病虫害的调查及综合防治措施的研究
14.Harmless Control Technology of the Main Diseases and Pests in Yaguang Pear鸭广梨主要病虫害无公害防治技术研究
15.Population Heterogeneity of Three Entomogenous Fungi Caused Natural Epizootics of Spiders and Cicadas in Forests引起森林蜘蛛和蝉自然流行病的三种虫生真菌的种群异质性
16.The Isolation and Identification of Apple Stem Pitting Virus from Pyrus Pyrifolia and the Study on Genetic Transformation of Nicotiana Occidentalis with cp Gene from the Virus;砂梨上苹果茎痘病毒的分离鉴定及其cp基因遗传转化烟草研究
17.Studies on Elimination of Latent Viruses in Vitro-cultured Plants of Pyrus Pyrifolia by Treatment with the Quercetin Combined with Shoot-tip Culture;栎皮黄酮处理结合茎尖培养脱除砂梨植株中潜隐病毒研究
18.A High quality,Disease resistant and Late Mature Red Chinese Pear Variety - Hongxiangsu优质抗病晚熟红皮梨新品种——红香酥
相关短句/例句
sandy pear variety砂梨品种
3)sand pear seeds砂梨种子
1.The major causes of dormancy ofsand pear seeds and the major methods for breaking it were studied.结果表明,引起砂梨种子休眠的主要有种皮障碍、种胚休眠和种胚后熟;而解除休眠的主要方法为低温层积处理和植物生长调节剂处理。
4)Piroplasmosis[英][pir?pl?z"m?usis][美][,p?r?pl?z"mos?s]梨形虫病
1.Epidemiology and Control ofPiroplasmosis in Dairy in Nanyang City;南阳市奶牛梨形虫病的流行病学调查及防制
2.Piroplasmosis is a kind of tick-borne protozosis world wide and is gaining increasing interest.梨形虫病是一种越来越受关注的蜱播原虫病。
5)piroplasmosis[英][pir?pl?z"m?usis][美][,p?r?pl?z"mos?s]梨浆虫病
6)Reaumuria soongorica population红砂种群
1.On the basis of the theory of modularity, the correlation between environmental factors and the modular structure of theReaumuria soongorica population in the desert of Fukang, Xinjiang, was studied through analysis of the degree of relatedness adopted in the grey system theory.2 )在某种意义上 ,一级分枝系统是红砂植株的基础 ,三级分枝系统和当年生枝系统则是二级分枝系统的派生物 ,它们之间的关联性显示了红砂种群构件组成间的整合作用。
2.Reproductive characteristics of twoReaumuria soongorica populations was investigated at Alashan Region, Inner Mongolia.以 2个不同生境条件及发育阶段的红砂种群为对象 ,开展了红砂种群繁殖特性的研究。
延伸阅读
油井防砂和清砂对疏松油层进行层内胶固，在井筒内下筛管防止油层砂进入井内，以保证油井、注水井的正常生产，称防砂。防砂胶结疏松的砂岩颗粒随油、水进入井筒或携带至地面，会冲蚀、磨损、堵塞深井泵和管线以及地面设备,或沉积于井底,堵塞油层，使油井减产或停产；甚至油层坍塌，挤毁套管，导致油井大修或报废。采油时应根据生产动态、砂样分析及声波测井等资料，及时了解出砂原因、层位及性质，采取有效的防砂措施。防砂措施有筛管滤网和化学胶固两类，前者适用于各种完井方式，应用较广，后者主要用在套管射孔完成的井。通过试油、试采已证实出砂的油层，应考虑防砂完井。筛管滤网防砂也称机械防砂，将多缝筛管固定在带孔的钢管上，下至出砂层段并用携砂液将一定粒径的砂粒循环填充于筛管外，靠管外砂粒所形成的桥拱，滤阻油层出砂。对油层单一、无水、气夹层的井，可采用先期防砂。即油层部分用扩眼钻头扩眼后，再下入筛管填砂（见图）。对多层合采或有水、气夹层的井，用射孔完井。清洗套管和炮眼后，再在套管内下筛管填砂。筛管的结构，从割缝到外包金属网或预填砾石，发展到用有机或无机材料预制滤管。目前多用梯形截面的不锈钢丝点焊成强度高、渗滤面大、耐腐蚀的金属绕丝滤管。此法要求根据砂样粒度分析资料，选定筛管缝宽及填入砂粒的直径。化学防砂向出砂油层注入一定量的化学胶结剂，将油层砂子胶固在一起。常用的胶结剂有树脂类（如酚醛树脂、环氧树脂等），有时也用水泥类材料。要求胶结剂在固结时体积收缩，或加入增孔剂，造成一定的渗透性，以尽量减少对产量的影响。对已经大量出砂的油层，用下列方法形成有渗透性的人工井壁：①将砂与胶结剂按比例混合后,挤入地层；②预先向出砂层填砂,再将原料如甲醛和苯酚以及固化剂按序挤入地层，在地层条件下合成树脂；③石英砂外包一层树脂，在未完全固化前挤入地层，在油层温度条件下固化；④用N2作载体把SiCl4蒸气引入油层，使之分解,析出的Si对疏松砂子起胶结作用。化学防砂的优点是可用于同井多油层防砂，不缩小井眼；缺点是成本较高，易降低出砂层的生产能力，对于油井先期防砂或注水井防砂，效果较好。清砂清除井底沉砂，一般下入油管，用洗井液循环冲洗，带出地面。炮眼内积砂，用专门的洗井封隔器分段冲洗。井下深井泵等设备内的积砂，须将设备起出地面，检查清理。参考书目T. O. Allen & A.P.Roberts, Production Opera- tions,Vol.2,2nd ed.,Oil & Gas Consultants Inter-national,Tulsa,1982.
