简析利用衰减控制修正不规格网格多面函数在绘制降水等值线中的缺陷

本文采用不规则网格多面函数技术,通过增加衰减控制,很好地解决不规则网格多面函数等值线在处理降水等值线趋势一直延续的缺陷.算法一般步骤首先是根据散点划分网格,其次是散点插值到计算网格节点,再次是根据指定的等值线值,检索网格的各边节点.按确定的搜索算法连接等值线.     

Molecular Characterization and Expression Patterns of Two Pheromone-Binding Proteins from the Diurnal Moth Phauda flammans (Walker) (Lepidoptera: Zygaenoidea: Phaudidae)

Sex pheromone-binding proteins (PBPs) play an important role in sex pheromone recognition in Lepidoptera. However, the mechanisms of chemical communication mediating the response to sex pheromones remain unclear in the diurnal moths of the superfamily Zygaenoidea. In this study, Phauda flammans (Walker) (Lepidoptera: Zygaenoidea: Phaudidae) was used as a model insect to explore the molecular mechanism of sex pheromone perception in the superfamily Zygaenoidea. Two novel pheromone-binding proteins (PflaPBP1 and PflaPBP2) from P. flammans were identified. The two pheromone-binding proteins were predominantly expressed in the antennae of P. flammans male and female moths, in which PflaPBP1 had stronger binding affinity to the female sex pheromones Z-9-hexadecenal and (Z, Z, Z)-9, 12, 15-octadecatrienal, PflaPBP2 had stronger binding affinity only for (Z, Z, Z)-9, 12, 15-octadecatrienal, and no apparent binding affinity to Z-9-hexadecenal. The molecular docking results indicated that Ile 170 and Leu 169 are predicted to be important in the binding of the sex pheromone to PflaPBP1 and PflaPBP2. We concluded that PflaPBP1 and PflaPBP2 may be responsible for the recognition of two sex pheromone components and may function differently in female and male P. flammans. These results provide a foundation for the development of pest control by exploring sex pheromone blocking agents and the application of sex pheromones and their analogs for insect pests in the superfamily Zygaenoidea.     

高温碳酸盐岩油藏酸压用酸液体系发展与应用现状

塔河油田碳酸盐岩缝洞型油藏储层改造存在高温条件下酸岩反应速度快、滤失量大的特点,常规酸液体系难以实现深度改造和提高酸蚀裂缝导流能力的目的.通过多年室内研究与现场试验,形成了以胶凝酸、变黏酸、转向酸、地面交联酸为主的多套酸液体系.通过高温流变实验,分析不同油藏类型酸压适合的酸液体系,指导单井酸压酸液选型和工艺优化,取得较好的现场应用效果.     

Deep Learning Based User Grouping for FD-MIMO Systems Exploiting Statistical Channel State Information

The joint spatial division and multiplexing(JSDM) is a two-phase precoding scheme for massive multiple-input-multiple-output (MIMO) system under frequency divis...     

重磁异常的快速均衡边界识别方法

边界识别是位场数据解释中一项重要任务,可用于资源探测等领域,是目前研究的热点问题之一.对于深部异常体目标,采用传统的边界识别方法易出现模糊、发散、变形等问题,而改进的方法大多采用高阶导数,虽然能够很好地识别出深部异常体边界,但是计算复杂,易受噪声干扰.为了改善以上问题,提出了一种稳定的快速边界识别方法,仅利用符号函数和...     

Improved sensing performance of WO3 nanoparticles decorated with Ag and Pt nanoparticles

Gas sensors built with metal oxide semicon-ductors have attracted tremendous attention due to the growing demand for the detection of inflammable,explo-sive and...     

天车调度在优化钢厂物流管制中的重要作用

运用物流学中装卸搬运的知识,归纳了现代制造流程中运输环节的功能和作用,分析了炼钢厂物流系统中天车作业的特点,并对钢厂时间因素和生产工艺进行了研究与分析,从中可知天车调度在优化钢厂物流管制中的重要作用。     

铈盐在铝合金阳极氧化后处理工序中的应用

将铝合金稀土转化膜成膜工艺用作阳极氧化后处理工艺.多种实验结果表明,阳极氧化后经稀土处理,膜的耐蚀性有明显的提高,铈盐对多孔氧化膜层具有封闭作用,其封闭效果可与常温封闭方法相比拟.     

Investigation into the InAs/GaAs quantum dot material epitaxially grown on silicon for O band lasers

InAs/GaAs quantum dot(QD)lasers were grown on silicon substrates using a thin Ge buffer and three-step growth method in the molecular beam epitaxy(MBE)system.In addition,strained superlattices were used to prevent threading disloca-tions from propagating to the active region of the laser.The as-grown material quality was characterized by the transmission electron microscope,scanning electron microscope,X-ray diffraction,atomic force microscope,and photoluminescence spectro-scopy.The results show that a high-quality GaAs buffer with few dislocations was obtained by the growth scheme we de-veloped.A broad-area edge-emitting laser was also fabricated.The O-band laser exhibited a threshold current density of 540 A/cm² at room temperature under continuous wave conditions.This work demonstrates the potential of large-scale and low-cost manufacturing of the O-band InAs/GaAs quantum dot lasers on silicon substrates.