武汉钰龙金融广场超深基坑工程设计方案选型          下载免费PDF全文

杜魁  余小国  岳丽娜  李超 《探矿工程》2015,42(12):28-33

以武汉钰龙金融广场超深基坑工程为实例,在结合常用的深基坑设计方案的基础上分别从基坑总体设计方案选定、基坑围护体系选定和设计、支撑体系选定、基坑降水选定、土方开挖方案选型和换撑方案的选定等方面进行探讨,并确定最终的基坑工程设计方案选型,即地下连续墙围护+3道内支撑+管井降水处理承压水的支护方案。  相似文献   

基于双边结构张量的局部自适应图像超分辨率重建     

岳林蔚  沈焕锋  袁强强  张良培  兰霞 《武汉大学学报(信息科学版)》2015,(4):493-497,528

利用超分辨率重建技术可以有效提高图像的空间分辨率,其中先验模型的选取尤为关键。在最大后验概率(MAP)的框架下引入双边结构张量测度,联合像素邻域4个方向的梯度算子提出一种局部自适应先验方法,构建图像超分辨率重建模型,并利用迭代重加权范数(iteratively reweighted norm)对其进行转换求解。基于标准的测试图像进行了实验,并将本方法与拉普拉斯先验、Huber-Markov先验以及BTV先验的重建结果进行对比,验证了该方法的有效性。  相似文献   

Towards More Snow Days in Summer since 2001 at the Great Wall Station,Antarctic Peninsula:The Role of the Amundsen Sea Low     

Minghu DING  Wei HAN  Tong ZHANG  Xiaoyuan YUE  Jeremy FYKE  Ge LIU  Cunde XIAO 《大气科学进展》2020,37(5):494-504

The variation in the precipitation phase in polar regions represents an important indicator of climate change and variability.We studied the precipitation phase at the Great Wall Station and Antarctic Peninsula(AP)region,based on daily precipitation,synoptic records and ERA-Interim data during the austral summers of 1985?2014.Overall,there was no trend in the total precipitation amount or days,but the phase of summer precipitation(rainfall days versus snowfall days)showed opposite trends before and after 2001 at the AP.The total summer rain days/snow days increased/decreased during 1985?2001 and significantly decreased at a rate of?14.13 d(10 yr)?1/increased at a rate of 14.31 d(10 yr)?1 during 2001?2014,agreeing well with corresponding variations in the surface air temperature.Further,we found that the longitudinal location of the Amundsen Sea low(ASL)should account for the change in the precipitation phase since 2001,as it has shown a westward drift after 2001[?41.1°(10 yr)?1],leading to stronger cold southerly winds,colder water vapor flux,and more snow over the AP region during summertime.This study points out a supplementary factor for the climate variation on the AP.  相似文献   

Simulation of the Direct Radiative Effect of Mineral Dust and Sea Salt Aerosols in a Doubled Carbon Dioxide Climate          下载免费PDF全文

YUE Xu  LIAO Hong  TANG Jin-Ping 《大气和海洋科学快报》2013,6(5):343-348

The authors examine the equilibrium climatic response to the direct radiative effect(DRE)of mineral dust and sea salt aerosols in a doubled-CO2climate with two-way coupling of aerosol-climate interactions.In response to the drier and windier conditions,dust emissions increase by 26%in the Sahara Desert and by 18%on the global scale relative to present day.Sea salt emissions increase in high latitudes(60°)but decrease in middle latitudes(30°–60°)of both hemispheres due to the poleward shift of westerlies,leading to a 3%decrease in global emissions.The burdens of dust and sea salt increase by 31%and 7%respectively,because reductions in rainfall over the tropical oceans increase the lifetime of particles in the warmer climate.The higher aerosol loading in the doubled-CO2climate reinforces aerosol DRE by0.2 W m 2,leading to an additional cooling of 0.1°C at the surface compared with the climatic effects of aerosols in present day.The additional cooling from changes in natural aerosols compensates for up to 15%of the regional warming induced by doubled CO2.  相似文献   

矿业开发与生态环境一体化     

张军营  孔小卫  徐莉  岳喜平 《河南国土资源》2001,(3)

概述了矿业开发与生态环境的关系 ,矿业开发与生态环境一体化的原则和组织 ,国内外现状和发展趋势 ,对河南省矿业生态环境存在问题及其原因进行了综合分析 ,论述了矿业开发与生态环境一体化的准则与前景 ,提出今后工作建议。  相似文献   

地幔岩包体中金富集规律——以中国东部地幔岩包体为例     

张维萍  赫英  岳可芬 《地球科学与环境学报》2007,29(2):117-119,125

采集中国东部玄武岩中橄榄岩包体27件,测定了其主量元素氧化钙、贵金属金以及其中21件橄榄岩包体的铂族元素。橄榄岩包体中金与氧化钙质量分数的相关性表明,金在地幔演化初期可能主要赋存于单斜辉石中,反映地幔包体中金可能与地幔演化及熔融程度有关。饱满型或弱亏损型橄榄岩包体具有相似平坦的铂族元素球粒陨石标准化分布模式,其都对应有高的金质量分数;而强亏损型橄榄岩包体的铂族元素球粒陨石标准化分布模式呈下降趋势,且对应橄榄岩包体的金质量分数均较低。  相似文献   

用正行列式解瓶颈指派问题     

由雷  岳中亮 《广东海洋大学学报》2007,27(6):67-70

用正行列式作为工具,给出了瓶颈指派问题新的解法,并利用正行列式的值求出了瓶颈指派问题的全部最优解。最后通过一个实例说明该算法的实用和有效性。  相似文献   

APPEARANCE PATTERN OF TOOTH GERMS WITH DEVELOPMENTAL PROCESS IN MYLOPHARYNGODON PICEUS     

乐佩琦 《中国海洋湖沼学报》1995,(2)

The pharyngeal dental formula of Mylopharyngodon piceus is 4-5 as a rule, and the dentition isasymmetrical. It is difficult to identify each tooth in the larval dentition. In this paper the appearancepattem of tooth germ with developmental process in this fish is described in detail. The formationpattern of the left dentition is contrasted with that of the right one. In the developmental process,the left pharyngeal dentition lacks teeth at position An3. Thus the left dentition is D-type as designatedby Nakajima(1984), while the right one is A-type.  相似文献   

海冰动力学数值方法研究进展   总被引：1，自引：0，他引：1  

季顺迎  岳前进  王瑞学 《地球科学进展》2004,19(6):963-970

在海冰动力学数值模拟和预测研究中,人们将海冰视为连续介质分别建立了欧拉坐标下的有限差分（FD）方法、拉格朗日坐标下的光滑质点流体动力学（SPH）方法、欧拉和拉格朗日坐标相结合的质点网格法（PIC）,近年来又发展了基于非连续介质的颗粒流（GF）方法。对以上几种海冰动力学数值方法的特点和适用性进行了讨论,结果表明：FD、PIC和SPH方法可适用于中长期海冰动力学数值模拟,但SPH方法的计算效率需进一步提高;GF方法在不同尺度下的海冰动力学数值模拟中的计算精度均有很强的适用性,但目前较适用于小尺度下海冰动力学基本特性的数值试验研究,计算时效还不能满足实际海冰数值模拟和预测的要求。为进一步提高海冰动力学模拟的精度和适用性,在不同时空尺度下分别发展与其相适应的数值方法是必要的。  相似文献   

空间距离交会原理及应用     

岳建平  马保卫 《测绘通报》2006,(11):38-39,51

深入研究空间距离交会的基本原理,详细推导数据处理的主要公式,利用该公式可直接解算出任意投影面上的平面坐标和高程。结合工程实例,验证该方法的正确性和实用性,并讨论该方法在实际应用中的注意事项。  相似文献