Hawking radiation of non-asymptotically flat rotating black holes     

Izzet Sakalli  Onur Atilla Aslan 《Astrophysics and Space Science》2016,361(4):128

  相似文献   

Prediction of sawing performance based on index properties of rocks   总被引：1，自引：1，他引：0  

Fatih Bayram 《Arabian Journal of Geosciences》2013,6(11):4357-4362

Performance analysis of all systems used in industrial production is very important subject in terms of capturing the low production cost. This subject is also important for choosing production methods in natural stone processing. Circular sawing is a commonly used method in natural stone processing. The preliminary prediction of circular sawing performance is very useful for stone producers. In this study, the prediction of sawing performance from some index properties of stones was conducted. The unit wear on diamond segments was evaluated as performance criteria. The statistical analysis was carried out, and this performance parameter was predicted from some index properties including cone indenter hardness, Shore hardness, Böhme surface abrasion, and brittleness. The most suitable prediction equation derived from regression analysis was selected. It was determined that this equation was statistically reliable for prediction of unit wear for natural stone processing.  相似文献   

Late Pleistocene and Holocene Sea Level Changes in the Hisarönü Gulf,Southeast Aegean Sea     

Nilhan K&#x;z&#x;lda  A. Harun zdas  Atilla Ulu 《Geoarchaeology》2012,27(3):220-236

Fluctuations in relative sea level, tectonic movement, and sedimentation during the late Pleistocene to Holocene in the Hisarönü Gulf (SE Aegean Sea) and surrounding area were investigated with a high‐resolution geophysical survey and underwater archaeological observations. The Hisarönü Gulf has been affected by vertical tectonic movements and rising sea level following the last glacial period (20,000 yr B.P.). High‐resolution seismic data were interpreted to reveal the structure of the late Pleistocene to Holocene deposits and determine the location of the paleoshoreline. In order to describe the relative rise of sea level, principles of sequence stratigraphy were used for the late Pleistocene to Holocene transition, and submerged archaeological remains and bioerosional indicators were used for the late Holocene period. A comparison of archaeological observations in the study area with the known regional sea level curve indicates that the relative rise in sea level for the late Holocene is, for the most part, due to the tectonic subsidence of the coastal plain. © 2012 Wiley Periodicals, Inc.  相似文献   

Geochemical traces of CO₂-rich fluid flow along normal faults in central Italy     

Fabrizio Agosta  reas Mulch †  Page Chamberlain  Atilla Aydin 《Geophysical Journal International》2008,174(2):758-770

  相似文献   

Seismic microzonation and earthquake damage scenarios for urban areas     

Atilla Ansal  Aslı KurtuluşGökçe Tönük 《Soil Dynamics and Earthquake Engineering》2010

A methodology for seismic microzonation and earthquake damage scenarios may be considered as composed of two stages. In the first stage, microzonation maps with respect to estimated earthquake characteristics on the ground surface are generated for an investigated urban area. The effects of local geological and geotechnical site conditions are taken into account based on site characterization with respect to representative soil profiles extending down to the engineering bedrock. 1D site response analyses are performed to calculate earthquake characteristics on the ground surface using as many as possible, hazard compatible real acceleration time histories. In the second stage, vulnerability of buildings and pipeline systems are estimated based on site-specific ground motion parameters. A pilot study is carried out to evaluate seismic damage in a district in Istanbul, Turkey. The results demonstrate the significance of site characterization and site response analysis in calculating the earthquake characteristics on the ground surface in comparison to simplified empirical procedures.  相似文献   

Editorial and welcome to a new ERA     

Atilla Ansal 《Bulletin of Earthquake Engineering》2015,13(1):1-2

  相似文献   

Effects of Torul dam on water quality in the stream Harşit,NE Turkey     

Adem Bayram  Hızır Önsoy  M. İhsan Kömürcü  V. Numan Bulut 《Environmental Earth Sciences》2012,65(3):713-723

This paper evaluates the effects of Torul dam on the stream Harşit water quality in terms of 13 physico-chemical parameters in the Gümüşhane Province, Eastern Black Sea Basin, Turkey. For this purpose, a study was fortnightly conducted during the four seasons between March 2009 and February 2010. In two monitoring stations selected in the upstream and downstream of the Torul dam, T, pH, DO and EC were determined in situ, and collected water samples were analyzed for TH, COD, NH₄ ⁺-N, NO₂ ⁻-N, NO₃ ⁻-N, TN, TKN, PO₄ ³⁻-P and MBAS. According to the Turkish Water Pollution Control Regulation (TWPCR), the stream Harşit was classified, and the obtained results were evaluated for the values proposed by Turkish Standard (TS) 266 and World Health Organization (WHO) guidelines. The results showed that the stream Harşit has high-quality water in terms of, T, pH, DO, COD, NH₄ ⁺-N and NO₃ ⁻-N, but slightly polluted water in terms of NO₂ ⁻-N, TKN and PO₄ ³⁻-P, and polluted for MBAS. It was concluded that Torul dam has a positive effect on the stream water quality in terms of decrease in the annual average concentration values. The percent decreases for TH, COD, NH₄ ⁺-N, NO₂ ⁻-N, NO₃ ⁻-N, TN, TKN, PO₄ ³⁻-P and MBAS were 17.1, 20.3, 56.2, 62.6, 11.7, 11.9, 11.4, 17.8 and 71.4, respectively. The reason for these decreases is probably due to the Torul dam reservoir where the water has a hydraulic residence time and the exposure to chemicals by aquatic organisms or populations that ingest the water. Also, statistical analysis shows that there are significant correlations among the studied parameters.  相似文献   

Evaluations on the relation of RC building damages with structural parameters after May 19, 2011 Simav (Turkey) earthquake     

Hayri Baytan Ozmen  Mehmet Inel  Erdal Akyol  Bayram Tanık Cayci  Hayri Un 《Natural Hazards》2014,71(1):63-84

An earthquake has struck Simav, Kutahya, located in the western part of Turkey on May 19, 2011. This paper focuses on the evaluation of the regional damage data and detailed investigation on a set of selected reinforced concrete buildings in Simav county center. The soil properties in Simav are examined in detail using multi-channel analysis of surface wave measurements, boreholes and laboratory test data. The damages are observed to be independent of soil conditions being hilly or plain, both in regional and Simav county center level. However, a slight relation is observed: as the soil period increases, so does the damage. The most damaged buildings are the four story buildings, resembling the case after some other earthquakes in Turkey. Regarding the detailed numerical evaluations on the building set, the properties highly correlated with seismic damage are investigated. Based on the obtained findings, it is concluded that the global building properties may not be enough to establish a strong relation with damage due to the local damages at the structural member level, especially for smaller seismic events.  相似文献   

Reciprocal influence of Kürtün Dam and wastewaters from the settlements on water quality in the stream Harşit,NE Turkey     

Adem Bayram  Hızır Önsoy  Murat İhsan Kömürcü  Mehmet Tüfekçi 《Environmental Earth Sciences》2014,72(8):2849-2860

This paper aims to reveal the reciprocal influence of Kürtün Dam and wastewaters from the settlements on the water quality in the stream Har?it, NE Turkey. Several key water-quality indicators were measured: water temperature (T), pH, dissolved oxygen (DO), electrical conductivity, water hardness, chemical oxygen demand (COD), ammonium nitrogen (NH₄ ⁺–N), nitrite nitrogen (NO₂ ^?–N), nitrate nitrogen (NO₃ ^?–N), total Kjeldahl nitrogen (TKN), total nitrogen (TN), orthophosphate phosphorus (PO₄ ^3?–P), and methylene blue active substances (MBAS). The monitoring and sampling studies were conducted every 15 days from March 2009 to February 2010 at two stations selected in the upstream and downstream of the Kürtün Dam. It was concluded that the Kürtün Dam Lake had a high-quality water in terms of T, pH, DO, COD, NH₄ ⁺–N, NO₂ ^?–N and NO₃ ^?–N values, but slightly polluted water with respect to TKN, PO₄ ^3?–P, and MBAS according to the Turkish Water Pollution Control Regulation. The dam improved the stream water quality by increasing the DO concentration, and decreasing the NO₂ ^?–N and PO₄ ^3?–P concentrations thanks to its hydraulic residence time despite the wastewater discharge by the nearby settlements. However, the wastewater discharge deteriorated the stream water quality increasing the COD, NH₄ ⁺–N, NO₃ ^––N, and TN concentrations.  相似文献   

Investigation of Chemical Compositions of Urban,Industrial, Agricultural,and Rural Top‐soils in Izmir,Turkey     

Sinan Yatkin  Abdurrahman Bayram 《洁净——土壤、空气、水》2011,39(6):522-529

The top‐soil samples were collected from urban, industrial, agricultural, and rural sites to investigate the modification in the elemental composition due to anthropogenic influence in one of the biggest city of Turkey, namely Izmir. The elemental profiles were dominated by lithophilic elements such as Al, Ca, Fe, Mg, K, and sea salt element, Na, which is typical for Mediterranean region. The trace elemental concentrations showed significant variation with higher concentrations in the industrial sites, particularly in the vicinity of iron‐steel producers from scrap materials (EAF‐Steels). Lead, Zn, and Cd around EAF‐Steels were found to be higher than other sites. Comparison to universal upper crusts and local reference soil has shown that Izmir top‐soils were contaminated in terms of many trace elements, most probably due to anthropogenic activities. Correlation matrix, crustal enrichment factors, and factor analysis were applied to investigate the extent of soil modification and possible sources. The results indicated that the elemental profiles of top‐soils were mainly determined by parent materials; however, anthropogenic activities were found to be factor effective on the profile.  相似文献