Arsenic Removal by Adsorptive Flotation Methods          下载免费PDF全文

Ünzile Yenial  Gülay Bulut  Ayhan Ali Sirkeci 《洁净——土壤、空气、水》2014,42(11):1567-1572

  相似文献   

Seismotectonic database of Turkey     

Tamer Y. Duman  Tolga Çan  Ömer Emre  F. Tuba Kadirioğlu  Nilay Başarır Baştürk  Tuğbay Kılıç  Selim Arslan  Selim Özalp  Recai F. Kartal  Doğan Kalafat  Ferdane Karakaya  Tuba Eroğlu Azak  Nurcan M. Özel  Semih Ergintav  Sinan Akkar  Yıldız Altınok  Senem Tekin  Ayhan Cingöz  A. İhsan Kurt 《Bulletin of Earthquake Engineering》2018,16(8):3277-3316

Turkey is located in one of the most seismically active regions in the world. Characterizing seismic source zones in this region requires evaluation and integration of geological, geophysical, seismological and geodetical data. This first seismotectonic database for Turkey presented herein was prepared, under the framework of the National Earthquake Strategy and Action Plan—2023. The geographic information system (GIS)-based database includes maps of active faults, catalogues of instrumental and historical earthquakes, moment tensor solutions and data on crustal thickness. On the basis of these data, 18 major seismotectonic zones were delineated for Turkey and the surrounding region. The compilation and storage of the seismotectonic data sets in a digital GIS will allow analyses and systematic updates as new data accrete over time.  相似文献   

Volcanic ash and tsunami record of the Minoan Late Bronze Age Eruption (Santorini) in a distal setting,southwestern Turkey     

Erkan Aydar  Attila ÇİNer  Orkun Ersoy  Emilie ÉCochard  Eric G. Fouache 《第四纪科学杂志》2021,36(4):586-597

We present the volcanic ash and tsunami record of the Minoan Late Bronze Age Eruption of Santorini (LBAES) in a distal setting in southwestern Turkey. In one of the drilled cores at the Letoon Hellenic antique site on Eşençay Delta, we encountered a 4 cm thick tephra deposit underlain by 46 cm thick tsunami-deposited sand (tsunamite), and an organic-rich layer that we ¹⁴C dated to 3295 ± 30 bp or 1633 bc. The relationship between Santorini distal volcanic ash and underlying tsunamite is described and interpreted. LBAES occurred in four main phases: (1) plinian; (2) phreatomagmatic; (3) phreatomagmatic with mudflows; and (4) ignimbritic flows and co-ignimbrite tephra falls. In this study, we aim to understand which eruptive phases generate distal ash during the Minoan eruptive sequence by examining the 3D surface morphology of ash formed by different fragmentation processes. To that end, we used numerous statistical multivariates, 3D fractal dimension of roughness, and a new textural parameter of surface area-3D/plotted area-2D to characterise the eruption dynamics. Based on ash surface morphologies and the calculated statistical parameters, we propose that that distal ash is represented by a single layer composed of well-mixed (coarse to fine) magmatic and phreatomagmatic ash.  相似文献   

Improved Performance of Rock Bolts using Sprayed Polyurea Coating     

Eren Komurlu  Ayhan Kesimal 《Rock Mechanics and Rock Engineering》2015,48(5):2179-2182

  相似文献   

Snow avalanche incidents in north-western Anatolia,Turkey during December 1992     

Ibrahim Gürer  Harun Tunçel  Ö. Murat Yavaş  Tarhan Erenbılge  Ayhan Sayin 《Natural Hazards》1995,11(1):1-16

Snow avalanches take place in the mountainous regions of Turkey mostly in the eastern Anatolia Region with an average annual death toll of 23 people and much damage to property. However, in the mountainous areas of the Kastamonu and Sinop provinces in the western part of the Black Sea Region of Turkey between 25 and 30 December 1992, blizzards with heavy snowfall caused roof collapses and major avalanche events whereby 16 people were killed and 2 injured. When past records were investigated, there was no evidence that avalanche accidents had been encountered in the region where the dominant precipitation type is rain in the coastal zones and snow over the mountains. Moreover, avalanche prevention measures are so limited that the resettlement of villages or hamlets located in risk zones is common practice. In this article, avalanche formation associated with the meteorological conditions and geomorphologic features is discussed.This study was partially supported by Tübitak (Scientific and Technical Research Council of Turkey) with Project No. YBAG-0067.  相似文献   

October 23, 2011 Turkey/Van–Ercis earthquake: structural damages in the residential buildings     

Erkan Çelebi  Muharrem Aktas  Naci Çağlar  Aşkın Özocak  Mustafa Kutanis  Necati Mert  Zeki Özcan 《Natural Hazards》2013,65(3):2287-2310

On October 23, 2011, a magnitude of Mw 7.2 earthquake struck the Van province in eastern Turkey which caused approximately 600 life loss and 4,000 injured people. Although the recorded peak ground accelerations were relatively low (0.15–0.2 g) compared with that of other recent destructive Turkish earthquakes and the code-based design response spectrum, a large number of reinforced concrete buildings with 4–6 stories and non-engineered masonry buildings were either heavily damaged or collapsed in the region. Based on the post-earthquake technical inspections, the goal of this paper is to introduce major reasons for structural damages in the disaster area and to discuss these failures along with the approaches given in the design code which is renewed after August 17, 1999 Marmara Earthquake. Some remarkable lessons learned from earthquake-induced failures and damages specific to building construction techniques are presented in this paper.  相似文献   

Transferring the international DRR policy into the local context     

Elif Daldeniz  Nihal Ekin Erkan 《Natural Hazards》2013,66(2):1273-1285

The disaster experiences of the past resulted in the need for a new international policy. The paper examines the transfer of the international policy for disaster risk reduction (DRR) into a local context, Turkey and Turkish, where new and old perspectives meet. Analyzed is a corpus consisting of two texts, with the purpose of examining the concepts’ actual use and contexts shaped by different attitudes, based on the three-dimensional framework of critical discourse analysis, translation studies and conceptual history. The concept transfer from international to the local level inevitably involves translation. The texts included “new” DRR terms as a result of the concealed translation attempts to adjust the old and contemporary terminologies. Thus, non-functional terms with blurred meanings arose. The awareness that such processes of transfer are complex would help to overcome this kind of simplistic top-down approaches and to give priority to “communicative labor.” The framework is not presented due to space limitations. It was also observed that the Turkish terminology lacks clear definitions. To affirm this, an in-depth analysis is needed. Terms transferred across contexts may end lacking conceptualizations due to non-functional translation choices. When adopting new social policies, this can be overcome through making effort for communication. This research looks at conceptual struggles related to social issues from a different aspect. The vague terms and inefficiencies in social implementations can be avoided by authorities being aware that discourse, translation and their production are parts of social action.  相似文献   

Prediction of unconfined compressive strength of carbonate rocks using artificial neural networks   总被引：3，自引：2，他引：1  

Nurcihan Ceryan  Umut Okkan  Ayhan Kesimal 《Environmental Earth Sciences》2013,68(3):807-819

The unconfined compressive strength (UCS) of intact rocks is an important geotechnical parameter for engineering applications. Determining UCS using standard laboratory tests is a difficult, expensive and time consuming task. This is particularly true for thinly bedded, highly fractured, foliated, highly porous and weak rocks. Consequently, prediction models become an attractive alternative for engineering geologists. The objective of study is to select the explanatory variables (predictors) from a subset of mineralogical and index properties of the samples, based on all possible regression technique, and to prepare a prediction model of UCS using artificial neural networks (ANN). As a result of all possible regression, the total porosity and P-wave velocity in the solid part of the sample were determined as the inputs for the Levenberg–Marquardt algorithm based ANN (LM-ANN). The performance of the LM-ANN model was compared with the multiple linear regression (REG) model. When training and testing results of the outputs of the LM-ANN and REG models were examined in terms of the favorite statistical criteria, which are the determination coefficient, adjusted determination coefficient, root mean square error and variance account factor, the results of LM-ANN model were more accurate. In addition to these statistical criteria, the non-parametric Mann–Whitney U test, as an alternative to the Student’s t test, was used for comparing the homogeneities of predicted values. When all the statistics had been investigated, it was seen that the LM-ANN that has been developed, was a successful tool which was capable of UCS prediction.  相似文献   

Morpho-tectonic evolution of the Marmara Sea inferred from multi-beam bathymetric and seismic data   总被引：1，自引：6，他引：1  

Erkan?Goka?anEmail author  Timur?Usta?mer  Cem?Gazio?lu  Zeki?Ya?ar?Yucel  Kurultay??ztürk  Hüseyin?Tur  Berkan?Ecevito?lu  Bu?ser?Tok 《Geo-Marine Letters》2003,23(1):19-33

In an initial stage, the Sea of Marmara developed as a graben and, in due course, considerable volumes of sediments were deposited in this basin. Before 200 ka, a new fault (New Marmara Fault) cutting through the whole basin developed, which postdated large sub-marine land sliding in the western part of the basin. This mass movement created the Western Ridge. The initiation of this strike-slip fault indicates that the extensional stress regime was replaced by a new, shearing stress field. In the eastern part of the Marmara Basin, the New Marmara Fault consists of two branches. The northern one replaces the normal faulting at the bottom of the northeastern slope of the basin. As a result, this slope has been rejuvenated. The southern branch is located along the central axis of the basin, forming the major extension of the North Anatolian Fault Zone within the region. Two restraining bends were formed because of the counterclockwise rotation of that part of the Anatolian Block. This resulted the uplifting of the Eastern Ridge and the formation of the positive flower structure within the Tekirdag Basin. The establishment of the compressional regime around the Sea of Marmara also resulted in the northwest–southeast shortening of the initial Marmara Basin.  相似文献   

The Great Rift Valley of Madagascar: An extension of the Africa–Somali diffusive plate boundary?     

Timothy M. Kusky  Erkan Toramanand Tsilavo Raharimahefa 《Gondwana Research》2007,11(4):577-579

  相似文献