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Evolution of scouring process downstream of grade‐control structures under steady and unsteady flows

For many incised channels, one of the most common strategies is to install some hard structures, such as grade‐control structures (GCSs), in the riverbed to resist further incision. In this study, a series of experiments, including both steady and unsteady flow conditions, were conducted to investigate the scouring process downstream of a GCS. Three distinct phases, including the initial, developing and equilibrium phases, during the evolution of scour holes were identified. In addition, a semi‐empirical method was proposed to predict the equilibrium scour‐hole profile for the scour countermeasure design. In general, the comparisons between the experimental and simulated results are reasonably consistent. As the studies on temporal variation of the scour depth at GCSs caused by floods are limited, the effect of flood hydrograph shapes on the scour downstream of GCSs without upstream sediment supply was also investigated experimentally in this study. Based on the dimensional analysis and the concept of superposition, a methodology is proposed to simulate the time evolution of the maximum scour depth downstream of a GCS for steady flows. Moreover, the proposed scheme predicts reasonably well the temporal variations of the maximum scour depth for unsteady flows with both single and multiple peak. Copyright © 2012 John Wiley & Sons, Ltd.     

A new model for the vibration isolation via pile rows consisting of infinite number of piles

In this study, on the basis of the Floquet transform method, a numerical model for the simulation of the vibration isolation via multiple periodic pile rows with infinite number of piles is established. By means of the fictitious pile method due to Muki and Sternberg, the second kind of Fredholm integral equations for the pile rows are developed by using the fundamental solutions for the half‐space and the compatibility conditions between the piles and half‐space. Employing the Floquet transform method, integral equations for the pile rows in the wavenumber domain are then derived. Solution of the integral equations yields the wavenumber domain solution for the pile rows. The space domain solution can then be retrieved by inversion of the Floquet transform. Numerical results show that the proposed model with the Floquet transform method is in a good agreement with those of the conventional direct superposition method. On the basis of the new model, influences of the spacing between neighboring piles, the Young's modulus of the piles, and the pile length on the vibration isolation effect of the pile rows are investigated. Numerical simulations conducted in this study show that compared with the direct superposition method, the efficiency of the proposed model for simulation of the vibration isolation via pile rows is very high. Copyright © 2012 John Wiley & Sons, Ltd.     

通过JSP和数据库技术实现ILS部分功能

在B／S系统中，使用JSP技术动态读取数据库的内容．帮助NETMEETING取得当前系统中的用户列表，定位用户位置．并提供相关信息，实现ILS的部分功能。     

IMPACT OF STARVATION ON SURVIVAL, MEAT CONDITION AND METABOLISM OF CHLAMYS FARRERI

ＩＮＴＲＯＤＵＣＴＩＯＮＦｒｏｍｔｈｅ1990’ｓ,ｔｈｅｓｃａｌｌｏｐ,Ｃ.ｆａｒｒｅｒｉ,ｃｕｌｔｕｒｅｄｉｎｔｈｅｎｏｒｔｈｅｒｎＣｈｉｎａＳｅａ,ｄｅｔｅｒｉｏｒａｔｅｄｉｎｓｉｚｅ,ｈｅａｌｔｈａｎｄｏｕｔｐｕｔｂｅｃａｕｓｅｏｆｈｉｇｈｓｔｏｃｋｉｎｇｄｅｎｓｉｔｉｅｓ,ｓｈｏｒｔａｇｅｏｆｎａｔｕｒａｌｆｏｏｄａｎｄｄｉｓｅａｓｅｓ.Ｍａｓｓｍｏｒｔａｌｉｔｙｏｆ50%-90%ｏｃｃｕｒｒｅｄｉｎＪｉａｏｚｈｏｕＢａｙ,Ｑｉｎｇｄａｏ,ａｎｄＳｉｓｈｉｌｉｗａｎＢａｙ,Ｙａｎｔａｉ,ｆｒｏｍＪｕｌｙｔｏ…     

利用黄河泥沙围出“渤海湖”的初步设想

本文是一个关于将渤海变成淡水湖的水利工程的构想。让黄河的大量泥沙通过人工导流的方式沿莱州湾南岸与渤海海峡沉积延伸,产生的陆地将渤海封闭并逐渐形成淡水湖。这一工程将陆地连接山东半岛与辽东半岛,并为华北提供巨大淡水库,具有显著的经济、生态效益。具体实施上,可通过两道渔网式围栏促使黄河泥沙定点沉积并阻挡浪潮侵蚀,通过加强汛期水量增加黄河口泥沙。     

用线性规划法求解瞬变电磁场反射系数

讨论了在水平层状介质中的反射系数的物理意义 ,推出时间域含有以反射系数序列为未知项的欠定方程组 ,提出用线性规划法求解瞬变电磁场反射系数序列 ,并给出求解思路和程序框图。对两个理论模型进行了处理 ,计算出了其反射系数。算例分析结果表明 ,算法可靠 ,程序可行。这一方法可用于瞬变电磁成像数值计算中。     

论耿湋诗歌在唐诗演进中的角色和影响

耿湋诗歌在唐诗演进过程中扮演了独特的角色,产生了不容忽视的影响。其内倾凝缩的情感取向、注重细节的表现手法、清浅平远的审美风格与盛唐诗歌之外向浓烈、疏朗大气、雄浑爽健形成鲜明对照,对急于突破前人拘囿、有心另辟蹊径的中晚唐诗人有明显的开启、示范、渗透、辐射之功。其工于五律、兼擅七律的诗歌体式表现出明显的过渡痕迹,昭示出中晚唐古风消歇、近体勃兴与五律盛极、七律崛起的历史趋势。     

Virtual Field Geologic Trip System

Virtual Field Geologic Trip System (VFGTS) constructed by the technique of visualization can efficiently present geologic field information and widely used in the field of geologic education. This paper introduces the developing thinking of VFGTS and discusses the main implement processes. Building VFGTS mainly includes systemically gathering of field geological data, the building of virtual geological world, and displaying of virtual geologic world and human-computer interaction.