田阳三化螟蛾盛发高峰初日气象预警模型     

周冬梅  莫绍宁  欧阳兆云  农万江  黄晓文 《气象科技》2019,47(3):526-530

三化螟为水稻主要害虫之一,单食水稻,在田阳一年发生完全4个世代,开展各世代螟蛾盛发高峰期气象预警,对科学适时防螟灭虫,虫口夺粮意义重大。利用农业植保部门提供的三化螟蛾盛发高峰期虫情资料和气象部门气象观测同期资料,采用逐步回归方法,建立三化螟蛾盛发高峰初日气象预警模型。结果表明:各世代预警模型输出的盛发高峰初日与实况误差3天的拟合正确率为82.2%～92.9%。试报2015—2016年,第1世代预报与实况误差为3天,第2代至第4世代误差为1～2天。三化螟蛾盛发高峰初日气象预警模型的拟合正确率、试报结果误差范围比较理想,可投入日常业务应用。  相似文献   

渤中34-9油田储层敏感性评价          下载免费PDF全文

陈建宏  魏飒飒  余建生  王志超  赵海建  陈龙 《探矿工程》2021,48(9):111-118

渤中34-9油田为我国海上首个火成岩发育区的大型油田,油田位于渤中34围区,其主要目的储层为东三段和沙河街组。为加强油田储层保护,提高油气产量,本文通过分析储层岩性特征、孔渗特征和流体特征,对储层岩心进行速敏、水敏、盐敏、碱敏和酸敏储层敏感性评价,进而直观、定量地评价该油田储层损害因素,并针对性地提出预防和减少储层侵害的合理化建议,对渤中区块储层保护工作具有重要的现实意义。  相似文献   

IBIS-L系统与TM30全站仪在边坡变形监测中的对比分析     

余红楚  左小清  字陈波  徐小坤  王利启  刘海波 《大地测量与地球动力学》2015,35(4):718-721

使用IBIS-L系统对大型水电站边坡长时间的监测数据进行分析和处理,并与TM30全站仪进行变形监测精度对比。试验表明,IBIS系统可得到在雷达视线方向优于mm级精度的形变结果,优于TM30全站仪,可以实现高分辨率、高精度、实时的大型水电站边坡长时间变形监测。  相似文献   

环介导等温扩增联合横向流动试纸条快速检测扁浒苔(Ulva compressa)的研究   总被引：2，自引：1，他引：1  

陈先锋  周前进  王瑞娜  段维军  苗亮  陈炯 《海洋与湖沼》2015,46(4):819-827

本研究将环介导等温扩增技术(loop-mediated isothermal amplification,LAMP)与横向流动试纸条(lateral flow dipstick,LFD)的可视化检测方法结合,建立了扁浒苔(Ulva compressa)的LAMPLFD快速检测技术。该方法以扁浒苔的内转录间隔区(ITS1-5.8S-ITS2)序列为检测靶标,设计了3对特异性引物(其中,上游内引物由生物素标记)和1条异硫氰酸荧光素标记的探针。结果表明,LAMP最适反应温度为63°C,扩增时间为60 min,从核酸扩增到LFD结果判读需70 min。利用LAMP-LFD可特异性检出扁浒苔,对浒苔、曲浒苔、缘管浒苔和孔石莼等石莼属绿藻以及塔玛亚历山大藻、无纹环沟藻、东海原甲藻、锥状斯克里普藻和赤潮异弯藻等常见微藻的检测结果为阴性。该方法最低可检测到0.1 pg的扁浒苔基因组DNA,是以Uco ITS-F3和Uco ITS-B3为特异性引物的PCR方法的100倍。对实际样品的检测结果表明,LAMP-LFD方法检测扁浒苔与传统的形态学观察的结果一致。因此,该方法可快速、特异地检测出扁浒苔,而且操作简单,仪器设备依赖性低,有潜力成为扁浒苔现场检测的常规技术手段。  相似文献   

Parameters influence on maneuvered towed cable system dynamics     

《Applied Ocean Research》2015

The dynamic response of a towed cable system to ship maneuver is parametrically simulated. Three dimensionless parameters influence on towed cable system maneuverability is investigated. They are ratio of total length to turning radius R/L, ratio of cable mass to vehicle mass σ, and ratio of mass unit length to hydrodynamic force w/r. An oscillatory motion of towed vehicle is found in simulation of spiral towed courses. Features of this oscillation in different spiral courses are compared. The sharp turns, gradual turns and their transient states of towed cable dynamics for different course directions are discussed extensively. According to the characters of transient states and horizontal trajectories evolution of maneuvered cable system, the dynamic behaviors can be divided into three situations in Fig. 8 turning maneuvers. The behavior of towed cable system during a zigzag turning course is simulated in the end. Two ingredients of heave motion are found during small ratio of turning radii to length in this course. The primary damp to initial turning becomes weak and the response to alternative turns plays a more and more important role. The damping properties of the transient behavior in different maneuvers show a periodical invariance to σ during some turning maneuvers.  相似文献   

印度洋—西太平洋对流涛动的季节内特征     

张净雯  李建平  李艳杰 《大气科学》2015,39(2):221-234

本文利用30~60天带通滤波资料, 考察了不同季节印度洋—西太平洋区域对流活动季节内尺度变率的主要模态, 发现在不同季节赤道东印度洋(5°S~10°N, 70°E~100°E)和西北太平洋(5°N~20°N, 110°E~160°E)对流活动均存在反相变化的关系, 将之称为季节内尺度的印度洋—西太平洋对流涛动(Indo-West Pacific Convection Oscillation), 简称IPCO。对IPCO两极子区域对流活动进行超前滞后相关分析, 发现IPCO事件形成—发展—消亡的生命周期是由对流活动季节内振荡及其传播造成的。对流扰动首先在赤道中西印度洋形成, 随后逐渐向东发展变强, 在其继续变强的过程中将分两支传播:一支由赤道印度洋向北传播, 至印度半岛南部后逐渐减弱消失;另一支沿赤道继续东传, 在海洋大陆受到抑制, 快速越过海洋大陆到达赤道西太平洋后又开始发展变强, 随后北传至西北太平洋区域逐渐减弱, 最终至我国长江流域中下游到日本区域消失。将这一过程划分为8个位相, 详细分析了不同位相对应的环流场和降水场特征, 最后给出了IPCO事件演化示意图。  相似文献   

CLIMATOLOGICAL LOW-FREQUENCY OSCILLATION OF OLR OVER THE MARITIME CONTINENT WITH ITS POSSIBLE LINKAGE TO SUMMER PRECIPITATION IN CHINA     

靳振华  管兆勇 《热带气象学报(英文版)》2015,21(4):361-373

Using the 1979-2009 NCEP/NACR reanalysis data and precipitation records in East China, research is performed of the climatological features of low-frequency oscillation (LFO) in OLR over the Maritime Continent (MC) as well as their associations with precipitation disturbance in the eastern part of China. Results suggest that in the MC there is significant climatological low-frequency oscillation (CLFO) in outgoing long-wave radiation (OLR), with the intraseasonal oscillation (30-60 days) being the strongest for April-September, and the MC acting as a high-value region of percentage contributions of low-frequency OLR variance. On the low-frequency time scale there occur four events of more intense active OLR during this time interval. In the January-April (May-August) phase, MC convection is relatively weak (vigorous). The CLFO makes pronounced eastward displacement at tropics, with phase propagation seen longitudinally, too. There occur low-frequency disturbance circulations similar to the EAP wavetrain or P-J teleconnection, starting from the MC via the South China Sea and the Philippines to the Yangtze valley of China. At different phases, the variation in the low-frequency circulations and heating fields shows that the rainfall disturbance in eastern China is likely to be under possible effects of the CLFO from the MC in April-September, and the low-frequency heating variation exhibits a meridional pattern as an EAP wavetrain or P-J teleconnection. As the OLR CLFO is in a peak (valley) phase the low-level divergence or convergence with the reversal at high levels over the MC is related to relatively feeble (robust) low frequency convection, thereby exciting an EAP or P-J wavetrain from the MC to the Sea of Japan. At the higher levels, the South-Asian high is eastward (westward) of normal due to effects of low-frequency cyclones (anticyclones), resulting in less (more) rainfall in the Jiangnan (areas in the middle and lower reaches of Yangtze and to the south of the river) and Hetao (the Great Bend of Yellow River) areas, and increased (decreased) rainfall in SW China, Qinghai Plateau and Gansu. At the conversion phases, low-frequency convection becomes more active in parts of the MC, consequently exciting low-frequency wavetrain of cyclones-anticyclones-cyclones at low levels, making the South-Asian high southward of the mean, so that strong convergent zones emerge in the upper and middle Yangtze basins and Jilin of NE China, responsible for plentiful precipitation there in sharp contrast to the rainfall over the band between the Yellow and Huaihe Rivers and the Yunnan-Guizhou Plateau. These results help understand in depth the climatological LFO characteristics and the phase-locked feature, thereby further improving our understanding of the causes of rainfall disturbances in different parts of the country.  相似文献   

象山港海洋监测浮标在强台风“海葵”影响期间的可靠性分析          下载免费PDF全文

赵聪蛟  冯辉强  祝翔宇  周燕 《热带海洋学报》2015,34(2):8-14

  相似文献   

资源一号02C卫星数据在北京岩溶水资源勘查评价工程中的应用   总被引：2，自引：0，他引：2  

程洋  童立强  郭兆成  莫源富  纪轶群 《国土资源遥感》2015,(2):183-189

以资源一号02C(ZY1-02C)卫星数据为数据源,以GIS为数据处理平台,以遥感地质理论和水文地质理论为指导,将遥感技术应用于北京岩溶水资源勘查评价工程中。通过水文地质遥感解译和综合分析,优选了一处新的供水水源地,建立了适用于北方岩溶区的含水岩组和泉点的遥感解译标志,提出了基于GIS的水文地质分析方法,扩展了国产资源卫星数据的应用领域。  相似文献   

利用体应变观测资料检测地球自由振荡     

胡澜缤  李继业  张彦吉  王海涛  岳力  贾秀玲 《地震地磁观测与研究》2021,42(3):194-199

选用通河地震台体应变观测数据,采用功率谱密度估计方法,获得2015年5月30日日本小笠原群岛地区8.0级大地震和2017年9月8日墨西哥沿岸近海8.2级大地震激发的_0S_4—_0S_(35)基频球型自由振荡频率,并与地球初步参考模型(PREM)的理论自由振荡频率进行对比,结果发现:前者共被检测到11个基频信号,有7个信号与理论值存在偏差,1个存在频谱分裂现象;后者共被检测到17个基频信号,有9个信号与理论值存在偏差,1个存在频谱分裂现象。  相似文献