一类非线性椭圆方程组解的存在性

将一类非线性椭圆方程组的求解问题化归为一给定泛函的临界点问题．利用变分法、经典的极值理论和山路引理证明了给定泛函在各种不同条件下临界点及非平凡临界点的存在性，从而得到了这类非线性椭圆方程组的解及非平凡解．     

一种基于小波变换的数字图像自动聚焦算法

由傅立叶光学理论可知 ,图像高频能量值可以反映聚焦程度 .在传统图像灰度方差评价函数的基础上 ,利用小波多分辨率分析 ,提出了一种新的自动聚焦算法 .清晰度评价函数通过舍去图像低频概貌信号 ,突出了高频能量 ,具有更好的尖锐性 .并分析了分解层数对评价函数性能的影响 .通过改进的变步长爬山算法实验表明 ,该算法与传统灰度方差算法相比具有更好的聚焦精确度 .     

哈山地区白垩系沉积相研究

哈拉阿拉特山地区位于准噶尔盆地西北缘前陆褶皱冲断带上,油气资源丰富,但目前的研究中尚缺乏明确的沉积相划分。本文对白垩系底部开展沉积相研究,明确了哈山白垩系地层及砂体平面展布规律。对哈拉阿拉特山地区进一步的油气勘探活动具有一定的指导和借鉴意义。     

Shaking table tests on seismic measures of a model mountain tunnel

A series of three dimensional (3D) shaking table tests were carried out to investigate the mechanism and effect of seismic measures of mountain tunnel using a scaled model based on a real tunnel. Key technical details of the experiment, including similarity relations, seismic measures simulation, boundary conditions, sensor layout, modeling methods, and ground motion input were presented. Main seismic measures, including reinforcing surrounding rock with anchors, increasing lining flexibility with steel wire mesh, and installing seismic isolation layer between reinforced surrounding rock and tunnel lining, were investigated in this study. Experiment results show that: (1) adding a layer of steel wire mesh in the tunnel lining can improve the flexibility and seismic performance and also may effectively prevent radial cracks from crossing the lining; (2) installing a geofoam isolation layer between the reinforced surrounding rock and the tunnel lining reduces dynamic earth pressure by 70–90% for the lining without a seismic isolation layer; (3) the flexible joints can effectively avoid global failures of tunnel lining for they reduce dynamic strain and bending force in the tunnel lining and decrease the seismic energy transmission along the lining in axial direction; (4) reinforcing surrounding rock with anchors significantly reduces dynamic earth pressure and strain of the lining by about 50%. In addition, the length of seismic reinforcement for general mountain tunnel portal is recommended to be 50 m from the tunnel portal along the axial direction.     

秦巴山区农村传统民居绿色建筑模式初探

本文通过对秦巴山区山地传统民居进行实地调查,对其民居宅院建造特征、结构形式、构造方式进行了分析。在此基础上,结合气候模拟程序对该区域的自然气候环境与被动式建筑策略关系进行了定量化的研究,总结了秦巴山区农村传统民居适合当地气候及自然条件的绿色建筑模式,为该区域山地农村民居生态化建设提供引导及借鉴。     

世界遗产武当山的文化景观价值

武当山是中国重要的道教圣地,园林营建活动历史悠久、空间广袤、建造技术精湛,达到了皇家所要求的宏伟、威严和道教所追求的玄妙、超然,是人文美与自然美的高度统一。本文通过对世界遗产武当山文化景观的概述,认为武当山是人类文化的见证和古代科学技术的典范,也是我们建设山地人居环境的生动教材。     

关于城镇绿道选线与建设分析—以宜兴龙池山自行车绿道规划为例

随着生态环境问题的出现,旨在减轻生态问题的综合发展规划与各类专项规划相继出现,绿道规划建设就是其一。本文结合宜兴龙池山自行车绿道规划的案例,详细探讨了城镇绿道选线与规划建设的要点。     

复杂地形条件下三峡库区城市的生态图景* ——以云阳县城总体规划为例

地形复杂、生态敏感以及多地缘移民的社会融合是三峡库区移民迁建城市建设面临的主要问题。本研究以云阳县城总体规划为例,通过对云阳县城迁建十余年来城市建设所出现问题的全面解析,以＂生态维护与培育＂为第一要义,综合运用生态适宜性评价和景观生态学的相关方法,探索复杂地形条件下人地和谐的三峡库区移民新城建设的生态规划途径,构建非建设用地与建设用地契合的城市生态图景。     

山区高速铁路隧道内电气化过轨研究

接触网专业在山区高速铁路隧道内分区所、AT所设置的情况下需要设置大量的过轨管。本文结合云桂铁路隧道内分区所、AT所的设置方案．探讨隧道接触网过轨管的布置。     

Cone-shaped hollow flexible reinforced concrete foundation (CHFRF) – Innovative for mountain wind turbines

This paper presents an innovative type of mountain wind turbine foundation, namely, the cone-shaped hollow flexible reinforced concrete foundation (CHFRF). It consists of a top plate, a base plate and a side wall that are made of reinforced concrete. The cavity of the CHFRF is filled with rubble and soil directly from the excavation for the CHFRF, which means that it can absorb the spoil. A rubber layer is placed beneath the CHFRF to increase the foundation flexibility to resist cyclic and dynamic loadings and to increase the bearing capacity. The great advantages of the CHFRF are the reduction in the usage of concrete and steel and the protection of the vegetation around the wind turbine, compared with conventional mountain wind turbine foundations that are solid structures. It is verified through model tests and a numerical simulation that the CHFRF can provide higher lateral bearing capacity in comparison to the regular circular gravity-based foundation under the same foundation diameter and height, and that the bearing capacity is increased by approximately 33.5% accordingly. It is also found that the rubber layer can effectively reduce the accumulated rotation of the CHFRF under cyclic loading. The accumulated rotation of the CHFRF with a rubber layer having a thickness of 4 mm is decreased by about 50% compared to that of the CHFRF with a rubber layer having a thickness of 2 mm. In addition, the volume of concrete used for the CHFRF is only one-fifth of that used for the circular gravity-based foundation. Therefore, the CHFRF outperforms regular mountain wind turbine foundations.