高速公路中桩坐标计算及放样方法的探讨

探讨应用Casio-fx4850编程实现现场快速解算任意桩号坐标。最后讨论了实际放样工作中经常遇到的问题与解决办法。     

Seasonal changes in imposex and tissue burden of butyltin compounds in Thais clavigera populations along the coastal area of Mirs Bay, China

We assessed the current status of tributyltin (TBT) contamination of Thais clavigera (Gastropoda) along the coastal area of Mirs Bay, China for the first time. The snail samples were collected from 10 different sites in the summer (June) and winter (December) of 2006, respectively. They were analyzed for imposex status, i.e. relative penis size index (RPSI) and vas deferens sequence index (VDSI), followed by quantification of butyltins in their tissues. Most of the collected females suffered from imposex, but the level of butyltin contamination varied with the distance from Yantian Port, which is currently the fourth busiest container port in the world. The tissue concentration of TBT varied with season. For a particular site, the winter samples in general contained much higher concentration of TBT than the summer samples. RPSI, VDSI and organotin concentrations were higher in T. clavigera collected from sites closer to the Port, such as the Seafood Street and Kat O. Both RPSI and VDSI were positively correlated with the tissue burden of tributyltin. VDSI exhibited little seasonal variability, whereas RPSI showed marked seasonal variability, with lower values in the summer samples. The current results will serve as an important reference for long-term monitoring of butyltin contamination in this area.     

Study on electric variations of media in epicentral area by geomagnetic transfer functions

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Optical system research of multi-object fiber spectroscopic survey telescope

In the first part of this paper,four different Cassegrain optical systems with their correctors are designed and studied for multi-object fiber slit spectroscopic survey.The aperture in 6.5 m and field of view 3°are taken for these optical systems.Assuming observation wavelength range is 0.365–0.95μm,the maximum zenith distance for observing is 60°,the maximum diameter of these lenses is 1.66 m,the altitude of the telescope site is 2500 m,two correctors are composed of 4-piece lenses and the other two are 5-piece lenses.The results obtained are:f-ratio about 3.7,the image quality for all four systems with EE80D≤0.60′′,the linear diameter of the focal surface is about 1.2 m and 11 000 fibers can be set on it.Considering the limit of size of fused silica and optical glass,the maximum diameter for lens is about 1.7 m.Such a 6.5 m telescope is about the largest one if using the above correctors.Considering the multiobject spectroscopic survey is greatly important,we also studied some telescope optical systems having their aperture near or larger than 10 m used for the multi-object fiber spectroscopic survey.Such ideas are introduced in the last section of this paper.     

生态城市建设土地利用评价——以扬州市为例

本文从土地资源禀赋、土地利用效益、土地保护水平三个方面,初步建立了生态城市建设土地利用评价指标体系,并以扬州市为研究案例,得出扬州市2000～2008年的土地利用与保护综合水平。研究结果表明:2000年,扬州市土地利用与保护综合评价分值为52.9,处于生态恢复阶段中的治理小于破坏阶段;自2000～2008年扬州市土地利用与保护综合水平随时间呈递增趋势,特别是2004年以来递增速度明显加快,到2008年扬州市土地利用与保护综合分值为74.7,处于生态恢复阶段的末期,即将跨入生态保育阶段。最后,根据评价结论,提出了今后一段时期扬州生态城市建设土地利用与保护的建议。     

滑坡危险性预测模型的设计与实现

滑坡灾害的发生严重影响人类社会的生产生活,因此对滑坡灾害的预警预测工作一直是地质灾害监测和防治的重点,国内外众多学者都对此进行了相应研究。本文在前人的研究基础上把信息量模型和降雨诱发指数应用在滑坡预测研究中,充分考虑两者的耦合影响,建立了滑坡危险性预测模型,并完成了模型的开发工作。该模型实现了滑坡灾害危险性预测的快速化、自动化,并且已集成到江西省地质灾害预警预报分析决策系统中,得到了成功应用。     

盆地模拟技术中的化学动力学生烃模型与应用

油气地表化探数据的失真(特别是数据中的高值失真点)直接影响到化探异常圈定。本文根据油气地表化探数据的分布特点，利用概率统计原理，提出一种适合油气化探资料前期处理的失真数据的概率判定方法和处理手段，在对实际资料的应用中，取得了良好的效果。     

堰塞坝坝体材料渗流特性研究现状及展望

目前,国内外对地震堰塞坝体稳定性的研究较多,但多数为个例研究。在影响坝体稳定性的众因素中,堰塞坝体的材料组成及其渗透特性对坝体破坏模式有重要的决定作用。本文在前人研究的基础上,从渗流的基本规律、数值模拟、室内试验3个方面总结了针对堰塞坝坝体材料渗流的机理和研究方法。重点分析总结了堰塞坝坝体材料渗透性的研究进展,指出几何条件和水力条件共同决定土体发生渗透变形和渗透稳定性。最后分析了目前针对坝体材料渗透研究存在的问题,提出未来可能的研究方向。     

基于PSR模型的地质遗迹景观脆弱性评价——以永福县为例

地质遗迹景观脆弱性是地质遗迹景观系统对人类活动和自然条件变化反映的重要指标,是评价地质遗迹景观可持续利用的重要指标。文章以永福县典型地质遗迹景观为例,运用地质遗迹景观脆弱性影响因素压力-状态-响应（PSR）模型,从压力、状态、响应3个层面选取17个评价指标,构建地质遗迹景观脆弱性评价指标体系,采用层次分析法（AHP）确定各项指标权重,并运用德尔菲专家咨询法建立5级地质遗迹景观脆弱性划分标准,最后通过综合评分法对永福县地质遗迹景观脆弱性进行评价。结果表明:永福县地质遗迹景观顶子山、小山峡评价值为16.797 0、19.142 1,属微度脆弱;福禄泉、石占溪瀑布评价值为 39.162 8、39.777 5,属低度脆弱;拉孝江、百寿河、板峡湖评价值为 58.546 5、52.330 5、 52.520 9,属中度脆弱;百寿岩、新村屯洞、永福岩评价值为 65.743 0、64.089 3、72.939 5,属高度脆弱,这与实地调查结果相吻合,反映出永福县地质遗迹现状,由此说明PSR模型评价地质遗迹景观脆弱性具有实用性。      

地震动记录选取及其对网架屋盖动力响应的影响

地震动记录的合理选取对预测结构响应有着重要的作用。本文通过对风雨操场建筑混合结构的抗震性能分析,提出了一种对水平及竖向地震动频谱特性均进行控制的改进选波方法。为了评价不同选波方法的可靠性和有效性,根据初选条件选取55组三向地震动记录,并以55组地震动的统计反应谱作为目标反应谱,以55组记录计算的结构响应均值作为"预测值",通过与单周期点和双频段选波方法的计算结果对比,分析表明:改进选波方法计算的结构基底剪力、柱顶位移、支座位移和网架竖向位移的相对误差和变异系数均小于前两种选波方法,其计算结果更加可靠有效。