Visualization of geotechnical data by means of geographic information system: a case study in Eskisehir city (NW Turkey)   总被引：2，自引：2，他引：0  

Ahmet Orhan  Hasan Tosun 《Environmental Earth Sciences》2010,61(3):455-465

Recently, geographic information system Software’s are widely used in engineering geology applications. Such a study was performed in the Eskisehir urban area of about 30 km² via geo-engineering maps, cross-sections and panel-block diagrams, which are formed to predict the properties of foundation soil. In order to determine the engineering geology properties of the region, physical and mechanical characteristics of the soil profile were tested on 1,011 disturbed and 383 undisturbed samples from a total of 170 boreholes. Topographic, lithological and geotechnical data of the region were compiled as a database in computer. Five geological cross-sections were drawn to decipher specifically the alluvial deposits in detail in densely populated areas. Hence, geological characteristics of the area were evaluated in a three-dimensional mode. Five standard penetration test (SPT) cross-sections at the same directions and SPT, uniaxial compressive strength (qu) and soil class Zonation maps were produced at different depths and panel-block diagrams were also created to define the geo-engineering properties of the investigation area. In this respect, the sub-surface of the study area is fully visualized and useful predictor maps, cross-sections and panel-block diagrams are performed to be used in further studies.  相似文献   

Editorial     

C. Emdad Haque  Dale Dominey-Howes  Nuray Karanci  Gerassimos Papadopoulos  Ahmet Yalciner 《Natural Hazards》2003,29(3):307-308

Editorial Introduction

Editorial  相似文献   

iSERVO: Implementing the International Solid Earth Research Virtual Observatory by Integrating Computational Grid and Geographical Information Web Services     

Mehmet Aktas  Galip Aydin  Andrea Donnellan  Geoffrey Fox  Robert Granat  Lisa Grant  Greg Lyzenga  Dennis McLeod  Shrideep Pallickara  Jay Parker  Marlon Pierce  John Rundle  Ahmet Sayar  Terry Tullis 《Pure and Applied Geophysics》2006,163(11-12):2281-2296

We describe the goals and initial implementation of the International Solid Earth Virtual Observatory (iSERVO). This system is built using a Web Services approach to Grid computing infrastructure and is accessed via a component-based Web portal user interface. We describe our implementations of services used by this system, including Geographical Information System (GIS)-based data grid services for accessing remote data repositories and job management services for controlling multiple execution steps. iSERVO is an example of a larger trend to build globally scalable scientific computing infrastructures using the Service Oriented Architecture approach. Adoption of this approach raises a number of research challenges in millisecond-latency message systems suitable for internet-enabled scientific applications. We review our research in these areas.  相似文献   

Effect of nutrients on culture dynamics of marine phytoplankton     

Elif Eker-Develi  Ahmet Erkan Kideys  Suleyman Tugrul 《Aquatic Sciences - Research Across Boundaries》2006,68(1):28-39

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Seismic vulnerability assessment using regional empirical data     

Ahmet Yakut  Guney Ozcebe  M. Semih Yucemen 《地震工程与结构动力学》2006,35(10):1187-1202

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Performance improvement studies of masonry houses using elastic post‐tensioning straps     

Ahmet Turer  Serra Zerrin Korkmaz  Hasan Husnu Korkmaz 《地震工程与结构动力学》2007,36(5):683-705

Unreinforced masonry houses are composed of building blocks with weak inter‐binding action between them which commonly possess low tensile strength. The principal tensile stresses generated by out‐of‐plane bending and in‐plane shear forces cannot be tolerated well and leads to heavy structural damage and brittle collapse beyond linear capacity of the material. Remedies such as externally applied mesh reinforcement and post‐tensioning improves post and pre‐cracking performances; however, yielding of reinforcement material or shortening of walls due to cracking causes loss of integrity and post‐tensioning force. This paper discusses a research programme on earthquake strengthening of masonry houses using post‐tensioning by elastomeric straps and related shaking table tests on 1/10 scale single storey rural dwelling models. The aim of the study is to assess the use and effectiveness of post‐tensioning rubber straps at several different configurations especially for houses with heavy earth roofs supported on wooden logs. Full‐scale application can be conducted using scrap automobile tyres, which might be implemented as an economic and environment friendly alternative strengthening technique for poor residents of low‐cost dwellings. The performance and validity of the proposed strengthening techniques were tested on 1/10 scale models using a simplistic shaking table. The structural performance of the reinforced models with vertical post‐tensioning rubber straps was significantly improved as compared to the original specimen; the results were even better when vertical and horizontal straps were used. Obtained results show promise for seismic strengthening using rubber straps for post‐tensioning. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Modeling Aeration Efficiency of Stepped Cascades by Using ANFIS     

Ahmet Baylar  Davut Hanbay  Emrah Ozpolat 《洁净——土壤、空气、水》2007,35(2):186-192

The physical process of oxygen transfer or oxygen absorption from the atmosphere acts to replenish the used oxygen, a process termed re‐aeration or aeration. Aeration enhancement by macro‐roughness is well‐known in water treatment and one form is the aeration cascade. The macro‐roughness of the steps significantly reduces the flow velocities and leads to flow aeration along the stepped cascade. In this paper, the aeration efficiency in stepped cascade aerators was modeled by using the Adaptive Network Based Fuzzy Inference System (ANFIS). The obtained model was tested with experimental data. Test results showed that ANFIS can be used to estimate the aeration efficiency in stepped cascade aerators.  相似文献   

Hybrid genetic algorithms in view of the evolution theories with application for the electrical sounding method     

Ahmet T. Ba&#;okur  Irfan Akça  Nedal W.A. Siyam 《Geophysical Prospecting》2007,55(3):393-406

The classical genetic algorithm is a stochastic process which operates by natural selection. Although the algorithm may localize a point around the global minimum of the misfit function, it is not efficient at finding the precise solution. This paper suggests some hybrid genetic algorithms, derived from evolution theories, to overcome this problem. Firstly, sexual selection has been incorporated in the classical genetic algorithm to obtain a full representation of the Darwinist evolution concept. The simulation of sexual selection is performed by assigning a higher probability of surviving to some parameters that satisfy some algebraic relationships. This method is called the ‘marked constraints’ algorithm since it permits us to insert geological and geophysical constraints into the problem. The algorithm implementation is realized by progressively shrinking the parameter search space through successive generations. In this way, the genetic algorithm gains some degree of determinism. Secondly, since the evolution theory of Lamarck postulates that the acquired traits are passed on to the next generation, a hybrid use of the damped least‐squares method and the genetic algorithm is called Lamarckian inversion. Lamarckian inversion involves some improvement procedures that simulate the reduction of the misfit with the help of a derivative‐based method between two generations. Finally, although there is no correspondence in nature, Lamarckian and Darwinist evolution concepts are combined to strengthen the deterministic part of the solution algorithm. This is called the Lamarckian‐marked‐constraint algorithm. The merits and behaviours of the suggested algorithms are discussed using two examples. The first is a hypothetical example affected by a multiminima problem. The second examines the equivalence problem using vertical electrical sounding data.  相似文献   

A kinetic study of copper cementation with zinc in aqueous solutions     

Nizamettin Demirkıran  Ahmet EkmekyaparAsım Künkül  Ahmet Baysar 《International Journal of Mineral Processing》2007

Cementation of copper from zinc containing copper solutions using metallic zinc was studied in this work. The effect of copper, zinc and ammonium chloride concentration, stirring speed, pH and temperature on the cementation of copper was determined. Cementation rate increased with initial copper concentration, stirring speed and temperature. pH variation from 1 to 4 increased the cementation rate but at higher pH, the rate was not significantly effected. The cementation rate of copper increased with Zn²⁺ ion concentration. However, the rate of this rise was slightly less compared to the rise that occurred in the Zn²⁺ ions free copper solution.  相似文献   

Midbroken reinforced concrete shear frames due to earthquakes. A hysteretic model to quantify damage at the storey level     

H. U?ur Koyliioglu  Ahmet ?. Çakmak  Søren R.K. Nielsen 《Soil Dynamics and Earthquake Engineering》1997,16(2):95-112

A nonlinear hysteretic model for the response and local damage analyses of reinforced concrete shear frames subject to earthquake excitation is proposed, and, the model is applied to analyse midbroken reinforced concrete (RC) structures due to earthquake loads. Each storey of the shear frame is represented by a Clough and Johnston hysteretic oscillator with degrading elastic fraction of the restoring force. The local damage is numerically quantified in the domain [0,1] using the maximum softening damage indicators which are defined in closed form based on the variation of the eigenfrequency of the local oscillators due to the local stiffness and strength deterioration. The proposed method of response and damage analyses is illustrated using a sample 5 storey shear frame with a weak third storey in stiffness and/or strength subject to sinusoidal and simulated earthquake excitations for which the horizontal component of the ground motion is modeled as a stationary Gaussian stochastic process with Kanai-Tajimi spectrum, multiplied by an envelope function.  相似文献