Influence of Climatic Factors on the Recent Spread of Dubas Bug Ommatissus lybicus （Debergevin） on Date Palm Trees in Some Upper Euphrates Regions of AI-Anbar Province

The dubas bug Ommatissus lybicus （Debergevin） （Homoptera： Tropiduchidae） was almost absent in AI-Anbar Province during the past years, however, field survey conducted in different regions of the province during fall of 2007 indicated the presence of heavy infestation by this pest on date palm trees in some orchards toward the east of Hit city. Infestation was highly influencing in term of affected trees and accumulation of honey dew. Scattered infestations were also recorded in some orchards west of Hit city and near the cities of Haditha, Rawa and AI-Kaim near the Syrian border. However, a sharp decline of dubas population was observed during 2008 and subsequent years as a result of the influence of sever winter in 2008 and the continuous occurrence of dust storms which showed a detrimental effect on moving stages of dubas bug. Data showed that nymphs density reached to about 50 individuals/leaflet recorded during the last week of April and early May of 2008 and was reduced to less than 5 nymphs/leaflet by the end of the third week of May of the same year as a result of the indicated climatic factors. Farther samplings conducted in Spring and Fall seasons of 2009 and 2010 indicated that insects were mainly found on offshoots near the ground with a maximum density reached to 12 individuals/tree. Since the spread of the pest occurred in a discontinuous manner with no correlation to infestations in close by provinces indicating that the arrival or transportation of the pest was happened in a way other than the normal distribution, therefore, dubas bug may not persist in date palm orchards in A1- Anbar Province.     

烤烟上部叶烤青问题的综合治理

上部烟叶烤后含青将大大地降低烟叶的质量、等级和价格,严重时会导致烟叶丧失可用性.应采取综合技术措施,确保上部叶充分变黄并及时定色,防止发生烤青现象.     

吉林地区春季第一场透雨前期高空环流形势浅析

通过对历年吉林地区第一场透雨出现时大气环流的形势演变进行研究,客观总结预报着眼点,为吉林地区做好第一场透雨的预报提供依据。     

水陆稻根粗与抗旱性关系的研究

研究结果表明,水稻抗旱性与发芽后的种子根粗呈显著正相关;5叶时下位根粗品种问呈极显著差异.据此,可在拔节期通过目测选择根粗的抗旱材料.     

一次灾害性暴雪过程分析

[目的]分析本溪地区一次灾害性暴雪过程。[方法]利用天气常规资料,从天气形势和数值预报产品方面,对2009年12月4日08：00～5日08：00发生在本溪地区的暴雪过程进行了分析总结。[结果]华北气旋在渤海黄海加强形成的低空急流为此次过程提供了充足的水汽供应;对流层中低层辐合和高空辐散导致强烈的上升运动,为此次暴雪的产生提供了有利的动力条件。强降雪出现在850hPa涡度和200 hPa散度大值区内。[结论]850 hPa涡度、200 hPa散度、温度平流的强弱和冷暖过渡带位置对降水的强度和落区有很好的指示作用。     

乌苏里江上游虎头江段江鳕捕捞群体结构特性的研究

2003年5、10月对乌苏里江上游虎头江段江鳕进行种群结构及生物学特性调查研究，通过对60尾样本分析，结果表明：乌苏里江上游虎头江段江鳕W=0．0195L^2．7022(r=0．8991)，性比(♀：♂)为1．2：1。种群结构低龄个体所占比例明显偏高，年龄组成以2^ -3^ 为主，4^ 以上个体较少，种群低龄化现象严重，生殖群体组成单一，基本由第一次性成熟个体组成，种群数量2002年7．8t，2003年7．5t。目前乌苏里江上游虎头江段江鳕的资源状况处于下降状态。     

Reproductive migration of fish and movement in a series of reservoirs in the Upper Parana River basin,Brazil

This study evaluates the effectiveness of two fish passes at two hydropower dams (Canoas I and II) in the Upper Parana basin, which form part of a cascade of three reservoirs. Fish from 12 migratory species (3089 specimens) were captured during their ascending, reproductive migration and were tagged with hydrostatic tags. The recapture data (294 specimens over two consecutive years) showed that there is a strong tendency for the maintenance of ascending migration through reservoirs with fish passes but with differences in migratory activity within the same species. No eggs, larvae or juveniles of these species were found in samples collected over 5 years in the reservoirs above the fish passes. These data suggest that fish passes have contributed to the restoration of the migratory routes of adult fish but that in the absence of suitable spawning or nursery habitats for these species; they probably act as ecological traps and do not contribute to the recruitment of the species.     

Application of analytic hierarchy process for the selection of cotton fibers

In many engineering applications, the final decision is based on the evaluation of a number of alternatives in terms of a number of criteria. This problem may become very intricate when the selection criteria are expressed in terms of different units or the pertinent data are difficult to be quantified. The Analytic Hierarchy Process (AHP) is an effective way in dealing with such kind of complicated problems. Cotton fiber is selected or graded, in the spinning industries, based on several quality criteria. However, the existing selection or grading method based on Fiber quality Index (FqI) is rather crude and ambiguous. This paper presents a novel approach of cotton fiber selection using the AHP methodology of Multi Criteria Decision Making.     

集中采收对不同烤烟品种上部烟叶理化性状的影响

[目的]探讨不同烤烟品种上部烟叶采用集中采收的适用性。[方法]对不同烤烟品种（K326、云87和粤97）采取集中一次性采收的效果进行了比较。[结果]各品种在不同评价指标中具有各自的优势。集中采收方式下,云87和粤97烟叶开片较好,含梗率和叶厚度相对较小,化学成分较协调;K326品种单叶重和叶密度相对较小,烟碱含量较高,总糖和还原糖含量较低,整体表现较差。[结论]集中采收上部烟叶在不同烤烟品种上的适宜性大小为云87≥粤97〉K326。为提高上部烟叶质量提供了理论依据。     

基于TDIS框架的旅游形象策划探讨——以青海黄河上游水上游览带为例

旅游形象与区域旅游吸引力有密切的关系。通过对青海黄河上游沿岸旅游业发展现状及SWOT分析认为,青海黄河上游沿岸发展旅游业优势突出,面临很好的机遇,运用旅游形象设计系统（TDIS）,对青海黄河上游水上游览带旅游形象进行了塑造。