水传播的

Position parameters were obtained from the simulation with the model of towed array.Based on the theory of radiated noise forming, the launch noise was simulated according to test condition in Laboratory,and the result showed the launch impulsion noise obeyed SαS distribution. The simulated noise attenuating in deep sea was analyzed with a sound loss translation model.Minimum variance distortionless response,spatially smoothed MVDR, and beam-space multiple signal classification algorithm were adopted to process the signal, hence the source level, the frequency structure and the location of the launch noise were achieved.

基于试验的实际情况，根据潜艇拖曳阵模型，仿真生成了各水听器阵元与本艇的位置关系；根据噪声源理论模型分析产生雷弹发射模拟噪声，利用SαS分布模拟武器发射冲击噪声，仿真分析模拟噪声在海洋环境中的传播衰减，对阵元信号分别利用最小方差无畸变响应法（MVDR 、空间平滑MVDR以及适应子带的波束域多重信号分类算法进行信号处理，得到发射噪声的声源级、频谱结构和方位。

The bug transposons are ~98% identical and cluster phylogenetically with those of the opossum and squirrel monkey, two of its preferred mammalian hosts in South America.

这些转位子家族中的其中一个也存在于名为"静水椎实螺"的塘螺中，这种螺是感染很多脊椎动物的吸虫的一种传播媒介。

The bug transposons are ~98% identical and cluster phylogenetically with those of the opossum and squirrel monkey, two of its preferred mammalian hosts in South America.

这些转位子家族中的其中一个也存在于名为&静水椎实螺&的塘螺中，这种螺是感染很多脊椎动物的吸虫的一种传播媒介。

Abstract］ Objective: To verify if a DNA fragment we obtained from Pythium guiyangense Su before is the ORF of a subtilisin-like protease (Pr1) of P. guiyangense, a fungal pathogen of mosquitoes.

贵阳腐霉是由贵阳医学院苏晓庆教授分离得到的一株具有自主知识产权的可以高效地、特异地杀灭蚊幼虫的水生丝状真菌，可以有效切断经蚊虫传播疾病的途径［1］。

The virus is spread predominantly by the faecal–oral route, although rare outbreaks caused by contaminated food or water have occurred.

该病毒的传播主要是由粪便-口腔的路线，虽然罕见的爆发所造成的污染的食物或水有发生。

Following, a experiment has been carried out, the incident waves with a frequency band of 200kHz-3 50kHz are used to the experiment, and a series of peak value-time curves are drawn each 10kHz, corresponding time are found through fitting peak value, thus the position of the defect is calculated accurately. The application of awl-shaped sensor head in the heat change water pipe experiment indicates that the ultrasonic guided waves may transmit nearly 50 meters in the pipe, which is not influenced by the elbows and makes it possible to test defects in long distance and large-scale. The water-load pipe experiment indicates that the displace and energy maybe leakage at the near-surface, which is significant for the further research.

而后，采用200kHz至350kHz频段的入射波进行了实验验证，并每隔10kHz绘出一条峰值一时间的曲线，通过拟合峰值点，找到对应的时间，从而准确的计算出了缺陷的所在；应用锥形探头的热交换水管的实验表明，超声导波可以在管道中传播了近50米的距离，且不受弯头的影响，从而使得长范围、大规模检测成为可能，水载管实验说明了离面位移和能量可能会发生泄漏的特性，为导波的深入研究和应用作了铺垫。

BEIJING - Fast-spreading, foul-smelling blue-green algae smothered a lake in eastern China, contaminating the drinking water for millions of people and sparking panic-buying of bottled water, state media said Thursday.

北京－传播迅速、恶臭的篮绿色藻类在中国东部的湖域爆发，污染了数百万居民的饮水，引起了购买瓶装水的恐慌，国家媒体报道。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。