2000年以来库尔勒市果树冻害气象条件综合分析

2000年以来,巴州地区出现了3次较明显的冻害天气,其中库尔勒2次,焉耆盆地和静1次。本文从低温天气前期气候特征、低温强度及持续时间、积雪、地温、冻土深度等方面入手对库尔勒2000年以后的2次果树冻害天气进行综合分析,找出能提前表征果树冻害的相关气象参数,为巴州林果业气象决策服务提供必要参考,提高气象防灾减灾能力。     

塔里木盆地草湖凹陷油气勘探的基本条件及前景分析

“九·五”期间 ,我们对塔里木盆地库尔勒鼻凸—草湖凹陷油气勘探靶区进行了详细的研究。这个地区 ,经过十余年勘探 ,成果不理想。因此 ,有的研究者认为无进一步勘探的价值 ,有的专家则认为是有利的后备区。通过研究 ,我们认为 ,库尔勒鼻凸由于长期暴露 ,无进一步勘探价值 ;而草湖凹陷虽不是象阿克库勒凸起那样的优越的勘探区 ,但仍具备一定勘探前景 ,可以作为较为有利的后备接替勘探区。有利区块为小干湖区块和草 1井区块 ,其次是草湖凹陷西斜坡。     

WILD T_3经纬仪竖盘光路检修工艺

由于T_3仪器的竖盘光路采用与T_2不同的结构，因此竖盘光路的检修具有其特殊性。本文着重介绍竖盘的拆卸步骤，同时介绍一种简单的竖盘光路调整附加设备，从而简化了光路的调整。     

EOT2000红外测距仪的光学调整

本刊在1983年第5期上刊载的“EOT2000的四轴问题”一文对于EOT的四轴之间关系作了初步的探讨，为EOT的光学调整作了准备，本文将就结构原理及工艺上对EOT的光学调整进行论述。     

农村集体土地征地价格空间分布与城镇区位分布关系研究——以武安市为例

本文以河北武安市为例,研究分析区位因素中各因子如何影响征地价格的空间分布。综合利用GIS法、图示法、文献资料法、比较分析法,通过多年的征地案例整理,将征地案例样点标注到行政图上,并结合GIS手段将武安市征地价等级分区,进而分析征地价格的空间分布规律。根据选取的区位因子与征地价格进行分析比较,发现武安市的征地价格在空间分布上有一定的规律性,这种规律性与城镇的区位分布具有很强的相关性。     

Fast clogging problem of open check dams and a new type suggestion:curved footed type open check dam

Driftwood is one of the important physical components in mountainous rivers which causes severe hazards due to the clogging of bridges, culverts,and narrow sections during floods. Therefore, the understanding of driftwood dynamics and mitigation measures are crucial for managing wood in rivers.Open check dams are the most commonly used engineering measure for preventing driftwood from reaching downstream areas. Nevertheless, these open check dams frequently lose their sediment transport function...     

Altitude as environmental filtering influencing phylogenetic diversity and species richness of plants in tropical mountains

Elucidating how multiple factors affect biodiversity and plant community assembly is a central issue in ecology, especially in vulnerable ecosystems such as tropical mountains. These studies are more relevant in global warming scenarios that induce the upward displacement of plant species towards reduced habitats and hostile environments in tropical mountains. This study aimed to analyze how altitude affects taxonomic and phylogenetic diversity in plant communities of tropical mountains. Thus, w...     

Detecting exoplanets with FAST?

We briefly review the various proposed scenarios that may lead to nonthermal radio emissions from exoplanetary systems(planetary magnetospheres, magnetosphere-ionosphere and magnetospheresatellite coupling, and star-planet interactions), and the physical information that can be drawn from their detection. The latter scenario is especially favorable to the production of radio emission above 70 MHz. We summarize the results of past and recent radio searches, and then discuss FAST characteristics and observation strategy, including synergies. We emphasize the importance of polarization measurements and a high duty-cycle for the very weak targets that radio-exoplanets prove to be.     

Development versus conservation: evaluation of landscape structure changes in Dem?novská Valley,Slovakia

This paper presents the changes of landscape structure in the Dem?novská Valley which ranks among the most valuable protected areas of Slovakia. The area was selected on the basis of changes associated with the rapidly growing tourism industry and the rise of an important destination in the center of Low Tatras National Park, Slovakia. To document any changes, we visually interpreted data from aerial and satellite images in three periods(1949, 2007 and 2013) and for predicting future changes we used land use planning documentation. Interpreted data were analyzed using overlay analysis and landscape metrics. Results showed extensive changes in the landscape structure mainly connected with the development of tourism infrastructure. We also identified long-term changes whose causes stem from the transformation of society and forest management in the past. The dynamics and extent of these changes may increase in the future. We propose to stop future development of ski slopes and expansion of related infrastructure, to focus on sustainability and environmentally friendly operation of the existing ski resort and to invest a substantial portion of profits to support projects aimed to preserve surrounding lands and wildlife.