姜瘟病生物防治试验初报

用青枯病假单胞菌的拮抗微生物B130和MA—7制成的泥炭制剂具有良好的姜瘟病防治效果。B130制剂的防病及增产效果均很显著,防病效果为100.00％,增产率为34.87—48.15％;MA—7制剂仅能降低病情指数82.99—95.00％。     

Variations of optic properties of water under action of static magnetic field

Effects of static magnetic field on optic properties of water are investigated by infrared spectroscopy, ultraviolet spectroscopy and X-ray diffraction, respectively. The ultraviolet spectroscopy experiments show the changes of properties of water under action of static magnetic field, in the region of 191 to 400 nm. The infrared experiment shows that the water exposed in a magnetic field had saturation and memory effects. The magnetized effects increased with increasing exposed time, but were weakened with increasing of time when the magnetic field was removed. In the X-ray experiment, the strength of diffraction increased also, after the water was exposed in magnetic field. Meanwhile, the shift of peak and increase of strength of X-ray diffraction of magnetized water added with nanoFe3O4 occurred as compared with that of pure water added with nano Fe3O4. This result suggests that the magnetized wa- ter has certain magnetism. Finally, these phenomena are simply explained by the molecular structure of water and the theory of magnetization of water.     

Geochronolosic constraints on masmatic intrusions and mineralization of the Zhunuo porphyry copper deposit in Gansdese, Tibet

In situ zircon U-Pb ages for the recently discovered Zhunuo porphyry copper deposit in the western part of the Gangdese metallogenic belt in Tibet were determined by sensitive high-resolution ion microprobe （SHRIMP）. The ages can be divided into two separate groups, reflecting more than four major tectono-magmatic events in the area. The 62.5±2.5 Ma age of inherited zircons may be related to the volcanic eruption of the Linzizong Group formed shortly after the India-Asia continental collision. The 50.1±3.6 Ma age most likely corresponds to the time of underplating of mantle-derived mafic magma in Gangdese. The 15.6±0.6 Ma age obtained from magmatic zircons is interpreted as the age of crystallization of the Zhunuo ore-forming porphyry. Finally, a molybdenite Re-Os isochron age of 13.72±0.62 Ma is consistent with another zircon U-Pb age of 13.3±0.2 Ma, representing the time of copper mineralization. These ages, in combination with available literature data, indicate that magmatic crystallization and copper mineralization in the Gangdese metallogenic belt became gradually younger westward, and further suggest that the Zhunuo porphyry copper deposit was formed in the same tectonic stage as other porphyry copper deposits in the eastern and central Gangdese belt. This conclusion provides critical information for future exploration of porphyry copper deposits in western Gangdese.     

网格环境下的高效动态任务调度算法

网格系统具有异构性、动态性和分布性，这使得网格中的任务调度变得十分复杂，要求调度算法具有动态性和自适应性．文中将群体智能技术引入网格的任务调度中，针对一组相互独立的任务调度问题，提出了一种新的动态任务调度算法．该算法利用蜂群与环境的交互模型来实现网格中动态的任务分配；同时根据蜂群的自组织社会层次的概念，解决了算法中出现的竞争问题．实验结果表明，相比于现有的方法，该算法对于网格中的动态环境具有更好的适应性，且调度性能更优．     

流固耦合作用下的碳纤维螺旋桨多目标优化

为提高碳纤维复合材料螺旋桨的推进效率,达到设计要求,采用面元法与有限元法相结合的流固耦合分析方法对碳纤维螺旋桨进行水动力性能分析.引入近似模型技术,同时考虑桨叶几何参数和碳纤维材料铺层角度对螺旋桨水动力性能的影响,借助iSIGHT软件构建起基于响应面近似模型碳纤维螺旋桨多目标优化策略,并以深潜水器螺旋桨优化为例进行了碳纤维螺旋桨的多目标优化分析.结果表明:基于流固耦合分析的碳纤维螺旋桨多目标优化方法能耦合优化分析碳纤维螺旋桨的流体和结构性能,所得到的设计方案能满足设计指标中的要求,螺旋桨的各项性能指标均得到优化,并能快速高效地优化出最优的设计方案.     

Non-monotonic influence of a magnetic field on the electrochemical behavior of Fe78Si9B13 glassy alloy in NaOH and NaCl solutions

The corrosion behavior and microstructure of Fe₇₈Si₉B₁₃ glassy alloy in NaOH and NaCl solutions under a 0.02-T magnetic field were investigated through electrochemical testing and scanning electron microscopy (SEM). The current-density prepeak (PP) in the anodic polarization curves in low-concentration NaOH solutions (classified as type I) tends to disappear when the NaOH concentration is increased to 0.4 mol/L and the magnetic field is applied. Under the magnetic field, the height of the second current-density peak is increased in low-concentration NaOH solutions (type I) but decreased in high-concentration NaOH solutions (type II). The non-monotonic effect of the magnetic field was similarly observed in the case of polarization curves of samples measured in NaCl solutions. Ring-like corroded patterns and round pits are easily formed under the magnetic field in NaOH and NaCl solutions. These experimental results were discussed in terms of the magnetohydrodynamic (MHD) effect.     

山西省繁峙县宏山铁矿地质特征及找矿标志分析

通过对该区矿体赋存规律、矿体规模、厚度的变化及矿石物质组分、品位变化等的研究,初步确定宏山铁矿为一中型铁矿床。对该矿床的地质特征及找矿标志进行了初步探讨．对今后该区铁矿石的开采提供了理论依据。     

Preparation and luminescence properties of monodisperse silica/aminosilane-coated Y<Subscript>2</Subscript>O<Subscript>3</Subscript>:Yb,Ho upconversion nanoparticles

Monodisperse silica/aminosilane-coated Y 2 O 3:Yb,Ho nanoparticles are prepared via homogenous precipitation combined with a polyvinylpyrrolidone-assisted ammoniation method.The factors that contribute to the success of the coating are examined,and the procedure is optimized.Compared with uncoated nanoparticles,coated nanoparticles exhibit an increased ratio of green to red emission intensity,which can mainly be attributed to the decreased number of surface defects induced by the surface coating.     

敷设吸声尖劈的声纳平台水下声学特性试验研究

基于模型试验开展了敷设吸声尖劈的声纳平台水下声学特性研究,讨论了尖劈不同敷设方式下声纳平台的声场分布,分析了声波入射角度对声纳平台声场的影响.分析了声纳平台0%,36%,60%和100%敷设吸声尖劈,声波在0°方向和90°方向入射声纳平台的情况,以及尖劈不同敷设方式、声波不同入射角度时声纳平台的声场分布.研究表明:声纳平台内部各点声压不尽相同;随尖劈敷设密度的增加,声纳平台自噪声在降低,各水听器声压的差异在逐渐加大;吸声尖劈可改变声纳平台的声场,降低声纳平台的自噪声,但存在"声泄漏"现象;声波入射方向对声纳平台声场也有一定影响,但位置不同、声波频率不同,其影响也各有差异.     

用于品质动力学仿真的悬架非线性承载模型

针对传统的悬架非线性承载特性模型的卸载边界不一致及加载和卸载切换时承载特性的过渡曲线不一致影响悬架非线性承载特性的精确模拟等问题,在Fancher模型基础上,提出了基于悬架变形转折点的卸载边界修正算法及过渡曲线修正算法,通过卸载边界修正算法,实现了对悬架系统非线性承载特性中卸栽边界不一致现象的描述,通过过渡曲线修正算法...