The Relationship between Dst,IMF-Bz and Collision Parameters for O+ + N2 → NO+ + N Reactive Scattering in the Ionosphere     

Selçuk Sağir  Yaşar  Mehmet  Atici  Ramazan 《Geomagnetism and Aeronomy》2019,59(8):1003-1008

Geomagnetism and Aeronomy - The kinetic theory is particularly suitable and convenient to calculate the collision parameters in the ionospheric medium. In this study, the mean free path (λ)...  相似文献   

Extension of sea surface temperature unpredictability     

Akhmet  Marat  Fen  Mehmet Onur  Alejaily  Ejaily Milad 《Ocean Dynamics》2019,69(2):145-156

Ocean Dynamics - The sea surface temperature (SST) variability is clearly affected by global climate patterns, which involve large-scale ocean-atmosphere fluctuations similar to the El...  相似文献   

Carbonaceous matter in the Sariçiçek meteorite     

Mehmet Yesiltas  Timothy D. Glotch  Steven Jaret  Alexander B. Verchovsky  Richard C. Greenwood 《Meteoritics & planetary science》2019,54(7):1495-1511

As of today, the Sariçiçek (SC) meteorite is the newest howardite and the only confirmed fall among the 17 known howardites. In this study, we present isotopic, infrared, and Raman data on three distinct pieces of the SC meteorite. Our oxygen isotopic measurements show that Δ¹⁷O values of the pieces are close to each other, and are in good agreement with other howardites, eucrites, and diogenites. The carbon isotopic measurements, which were conducted by combusting terrestrial contamination selectively at temperatures lower than 500–600 °C, show the presence of indigenous carbon in the SC specimens. The matrix of these specimens, investigated via infrared microspectroscopy, appears to be dominated by clinopyroxene/orthopyroxene, forsterite, and fayalite, with minor contributions from ilmenite, plagioclase, and enstatite. Carbon‐rich regions were mapped and studied via Raman imaging microspectroscopy, which reveals that both amorphous and graphitic carbon exist in these samples. Synchrotron‐based infrared microspectroscopy data show the presence of very little aliphatic and aromatic hydrocarbons. The SC meteorite is suggested to be originating from the Antonia impact crater in the Rheasilvia impact basin on 4 Vesta (Unsalan et al. 2019). If this is in fact the case, then the carbon phases present in the SC samples might provide clues regarding the impactor material (e.g., carbonaceous chondrites).  相似文献   

Prediction of Reservoir Temperatures Using Hydrogeochemical Data,Western Anatolia Geothermal Systems (Turkey): A Machine Learning Approach     

Tut Haklidir  Fusun S.  Haklidir  Mehmet 《Natural Resources Research》2020,29(4):2333-2346

Natural Resources Research - Geothermal fluids can be used for purposes such as power production, district heating/cooling, agriculture, and industrial and thermal tourism. Although using...  相似文献   

Performance of two-equation turbulence closures in three-dimensional simulations of the Red Sea overflow   总被引：2，自引：2，他引：0  

Mehmet Il&#x;cak  Tamay M. zgkmen  Hartmut Peters  Helmut Z. Baumert  Mohamed Iskandarani 《Ocean Modelling》2008,24(3-4):122-139

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Studies on the effect of burden width on blast-induced vibration in open-pit mines     

Önder Uysal  Ercan Arpaz  Mehmet Berber 《Environmental Geology》2007,53(3):643-650

This study concerns the correlation between burden and blast-induced vibrations in open-pit mines. For this purpose, two different mines were studied. In these mines, the vibrations caused by explosions at burdens having widths ranging from 3 to 14 m were measured from various distances. From the results, it was found for these cases that burden width has a significant impact on vibrations. Consequently, it was proven that vibrations decrease as burden increases.  相似文献   

Determination of the Optimal Location of the Air Hole in Venturi Aerators     

Ahmet Baylar  Mehmet Unsal  Fahri Ozkan 《洁净——土壤、空气、水》2007,35(3):246-249

Dissolved oxygen is one of the most important water quality parameters. Aeration improves the water quality by maintaining good dissolved oxygen levels in water. Dissolved oxygen enters water by entrainment of air bubbles. A method of aeration that has become popular in recent years is the venturi aeration. In the present paper, experimental studies were conducted to investigate the effect of the location of the air hole in venturi tubes upon air injection. It was observed from the results that the location of the air hole playes a significant role for the air injection. The optimal air hole location that maximized the air injection in venturi aerators was determined.  相似文献   

Preliminary results of the alignment and Hartmann tests of the AZT-22 telescope     

Z. Aslan  I. F. Bikmaev  É. A. Vitrichenko  R. I. Gumerov  L. A. Dembo  S. F. Kamus  V. Keskin  U. Kiziloglu  M. N. Pavlinsky  L. N. Panteleev  N. A. Sakhibullin  S. O. Selam  R. A. Sunyaev  I. Khamitov  A. L. Yaskovich 《Astronomy Letters》2001,27(6):398-403

The AZT-22 telescope installed in Turkey (Antalia) was aligned and tested on stars by the Hartmann method. The rms normal deviation of an equivalent optical system is 0.040±0.016 µm. The circle of confusion is 0.40±0.04 arcsec in diameter at a 50% energy level.  相似文献   

Regional gravimetric quasi-geoid model and transformation surface to national height system for Turkey (THG-09)     

Ali Kiliçoğlu  Ahmet Direnç  Hasan Yildiz  Murat Bölme  Bahadir Aktuğ  Mehmet Simav  Onur Lenk 《Studia Geophysica et Geodaetica》2011,55(4):557-578

Turkish regional geoid models have been developed by employing a reference earth gravitational model, surface gravity observations and digital terrain models. The gravimetric geoid models provide a ready transformation from ellipsoidal heights to the orthometric heights through the use of GPS/leveling geoid heights determined through the national geodetic networks. The recent gravimetric models for Turkish territory were computed depending on OSU91 (TG-91) and EGM96 (TG-03) earth gravitational models. The release of the Earth Gravitational Model 2008 (EGM08), the collection of new surface gravity observations, the advanced satellite altimetry-derived gravity over the sea, and the availability of the high resolution digital terrain model have encouraged us to compute a new geoid model for Turkey. We used the Remove-Restore procedure based on EGM08 and applied Residual Terrain Model (RTM) reduction of the surface gravity data. Fast Fourier Transformation (FFT) was then used to obtain the residual quasigeoid from the reduced gravity. We restored the individual contributions of EGM08 and RTM to the whole quasi-geoid height (TQG-09). Since the Helmert orthometric height system is adopted in Turkey, the quasi-geoid model (TQG-09) was then converted to the geoid model (TG-09) by making use of Bouguer gravity anomalies and digital terrain model. After all we combined a gravimetric geoid model with GPS/leveling geoid heights in order to obtain a hybrid geoid model (THG-09) (or a transformation surface) to be used in GPS applications. The RMS of the post-fit residuals after the combination was found to be ± 0.95 cm, which represents the internal precision of the final combination. And finally, we tested the hybrid geoid model with GPS/leveling data, which were not used in the combination, to assess the external accuracy. Results show that the external accuracy of the THG-09 model is ± 8.4 cm, a precision previously not achieved in Turkey until this study.  相似文献   

Investigation of water quality on Gökçekaya dam lake using multivariate statistical analysis,in Eskişehir,Turkey   总被引：1，自引：0，他引：1  

B. S. Akin  T. Atıcı  H. Katircioglu  F. Keskin 《Environmental Earth Sciences》2011,63(6):1251-1261

Gökçekaya Dam is one of the dams located on the Sakarya River (Eski?ehir) in Turkey and is approximately 38 years old. No study regarding to the water quality of the dam lake has been hitherto made. This study aimed at determining the seasonal variations with physical, chemical, and biological parameters of the water quality of the dam lake. Depth-wise water samples were taken from five selected stations, in seasonal periods during 2005–2008, and anlayzed. The quality of water was classified in accordance with the results and taking into consideration many parameters. At the same time, number and type diversities of dissolved heavy metals and algae population were analyzed. Using principal component analysis (PCA) and classification analysis (CA) methods, differences between these parameters and samples from stations have been determined . The analysis showed that Gökçekaya dam lake, formerly an oligotrophic lake, has become a mesotrophic lake. And according to the results thereof the Lake has mezotrophic characteristics due to the sudden changes (including household waste water inflow and opening the Sar?yar dam lake shutters) in certain periods and in some stations. Hierarchical clustering analysis, revealed no significant difference between the measured parameters. And according to the Water Pollution Control Regulations in Turkey (WPCR) Gökçekaya dam lake is in the first class quality in terms of anions, cations, heavy metals, temperature, and pH values. However, the is of first class quality presence of nitrite reduces the water quality in the lake and causes this lake to be classified in the fourth class quality.  相似文献