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Articles 145681 - 145710 of 302511

Full-Text Articles in Physical Sciences and Mathematics

Geochemistry Of Travertine Deposits In The Eastern Anatolia District: An Example Of The Karakoçan-Yoğunağaç (Elazığ) And Mazgirt-Dedebağ (Tunceli) Travertines, Turkey, Leyla Kalender, Özlem Özteki̇n Okan, Murat İnceöz, Bahatti̇n Çeti̇ndağ, Vesi̇le Yildirim Jan 2015

Geochemistry Of Travertine Deposits In The Eastern Anatolia District: An Example Of The Karakoçan-Yoğunağaç (Elazığ) And Mazgirt-Dedebağ (Tunceli) Travertines, Turkey, Leyla Kalender, Özlem Özteki̇n Okan, Murat İnceöz, Bahatti̇n Çeti̇ndağ, Vesi̇le Yildirim

Turkish Journal of Earth Sciences

The Karakoçan-Yoğunağaç (Elazığ) and Mazgirt-Dedebağ (Tunceli) travertines, which are related to thermal springs, are situated on the right-lateral strike-slip Karakoçan Fault Zone (KFZ) and left-lateral strike-slip Pamuklu Fault Zone (PFZ) in eastern Anatolia. The surface area of the travertines varies from m2 to km2. Morphologically, the travertines are classified as ridge, banded, and terrace types due to deposition in different ways, in the releasing/restraining bends of the KFZ and PFZ and on the segments of faults. The banded travertines were dated by U-series, and an age of 160,000 ± 76 years was determined in only one sample from the Mazgirt-Dedebağ …

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Late Holocene Palaeoenvironmental Evolution Of The Northern Harbour At The Elaiussa Sebaste Archaeological Site (South-Eastern Turkey): Evidence From Core Ela6, Romana Melis, Maria Pia Bernasconi, Ester Colizza, Federico Di Rita, Eugenia Equini Schneider, Emanuele Forte, Maria Eugenia Montenegro, Nevio Pugliese, Marco Ricci Jan 2015

Late Holocene Palaeoenvironmental Evolution Of The Northern Harbour At The Elaiussa Sebaste Archaeological Site (South-Eastern Turkey): Evidence From Core Ela6, Romana Melis, Maria Pia Bernasconi, Ester Colizza, Federico Di Rita, Eugenia Equini Schneider, Emanuele Forte, Maria Eugenia Montenegro, Nevio Pugliese, Marco Ricci

Turkish Journal of Earth Sciences

No abstract provided.

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Assessment Of Seismic Hazard In The Erzincan (Turkey) Region: Construction Of Local Velocity Models And Evaluation Of Potential Ground Motions, Aysegul Askan, Shaghayegh Karimzadeh, Michael Asten, Nazan Kiliç, Fatma Nurten Şi̇şman, Cenk Erkmen Jan 2015

Assessment Of Seismic Hazard In The Erzincan (Turkey) Region: Construction Of Local Velocity Models And Evaluation Of Potential Ground Motions, Aysegul Askan, Shaghayegh Karimzadeh, Michael Asten, Nazan Kiliç, Fatma Nurten Şi̇şman, Cenk Erkmen

Turkish Journal of Earth Sciences

No abstract provided.

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The Case Of The Carbonatite-Like Dyke Of The Madenska River Complex At The Kriva Lakavica Section In The Republic Of Macedonia: Oxygen And Carbon Isotopic Constraints, Matej Dolenec, Todor Serafimovski, Nina Daneu, Tadej Dolenec, Nastja Rogan Smuc, Petra Vrhovnik, Sonja Lojen Jan 2015

The Case Of The Carbonatite-Like Dyke Of The Madenska River Complex At The Kriva Lakavica Section In The Republic Of Macedonia: Oxygen And Carbon Isotopic Constraints, Matej Dolenec, Todor Serafimovski, Nina Daneu, Tadej Dolenec, Nastja Rogan Smuc, Petra Vrhovnik, Sonja Lojen

Turkish Journal of Earth Sciences

The oxygen and carbon isotope compositions of carbonate samples from the carbonatite-like dyke of the Madenska River complex at the Kriva Lakavica section, samples of calcite skarns from the Damjan Fe-ore deposit and the Sasa Pb-Zn ore deposit, and samples of marbles from the Pohorje Mountains were analyzed to provide critical evidence in favor of the magmatic or sedimentary origin of this carbonatite-like dyke. We suggest that the carbonatite-like dyke is not a "normal" carbonatite, but instead represents melted carbonates, which can be associated with an unexposed, deep-seated, causative magmatic body. This dyke has a fluidal texture and carries xenoliths …

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Estimating Depth To The Bottom Of Magnetic Sources At Wikki Warm Spring Region, Northeastern Nigeria, Using Fractal Distribution Of Sources Approach, Ema Michael Abraham, Ene Grace Obande, Mbazor Chukwu, Chibuzo Gabriel Chukwu, Mkpuma Rock Onwe Jan 2015

Estimating Depth To The Bottom Of Magnetic Sources At Wikki Warm Spring Region, Northeastern Nigeria, Using Fractal Distribution Of Sources Approach, Ema Michael Abraham, Ene Grace Obande, Mbazor Chukwu, Chibuzo Gabriel Chukwu, Mkpuma Rock Onwe

Turkish Journal of Earth Sciences

No abstract provided.

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Geodynamic Evolution Of The Sanandaj-Sirjan Zone, Zagros Orogen, Iran, Javad Mehdipour Ghazi, Mohssen Moazzen Jan 2015

Geodynamic Evolution Of The Sanandaj-Sirjan Zone, Zagros Orogen, Iran, Javad Mehdipour Ghazi, Mohssen Moazzen

Turkish Journal of Earth Sciences

No abstract provided.

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Calcareous Nannoplankton Changes During The Paleocene-Eocene Thermal Maximum In West Central Sinai, Egypt, Mahmoud Faris, Ibrahim Mohamed Ghandour, Esam Zahran, Gamal Mosa Jan 2015

Calcareous Nannoplankton Changes During The Paleocene-Eocene Thermal Maximum In West Central Sinai, Egypt, Mahmoud Faris, Ibrahim Mohamed Ghandour, Esam Zahran, Gamal Mosa

Turkish Journal of Earth Sciences

No abstract provided.

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Present State Of Knowledge And New Geochemical Constraints On The Central Part Of The Mexican Volcanic Belt And Comparison With The Central American Volcanic Arc In Terms Of Near And Far Trench Magmas, Surendra Pal Verma Jan 2015

Present State Of Knowledge And New Geochemical Constraints On The Central Part Of The Mexican Volcanic Belt And Comparison With The Central American Volcanic Arc In Terms Of Near And Far Trench Magmas, Surendra Pal Verma

Turkish Journal of Earth Sciences

No abstract provided.

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The Effects Of Bedding Directions On Abrasion Resistance In Travertine Rocks, Mehmedi̇ Vehbi̇ Gökçe Jan 2015

The Effects Of Bedding Directions On Abrasion Resistance In Travertine Rocks, Mehmedi̇ Vehbi̇ Gökçe

Turkish Journal of Earth Sciences

Travertine rocks are currently used in various architectural applications, cut perpendicular or parallel to bedding planes. Travertine stones used without enough attention paid to the cutting directions easily wear off in locations where pedestrian traffic is heavy and can cause some unexpected complications in practice. This study was conducted to elucidate the effects of cutting directions on the abrasion resistance of travertine stones. Travertine blocks were cut perpendicular and parallel to bedding planes, and their abrasion resistances were determined by means of the Böhme abrasion loss test. Travertine blocks were chosen from 6 different quarries whose products are currently in …

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An Approach To Paleoclimatic Conditions For Devonian (Upper Lochkovian And Middle Givetian) Ironstone Formation, Nw Anatolian Carbonate Platform, İsmai̇l Ömer Yilmaz, Mehmet Cemal Göncüoğlu, Di̇lek Gülnur Demi̇ray, İbrahi̇m Gedi̇k Jan 2015

An Approach To Paleoclimatic Conditions For Devonian (Upper Lochkovian And Middle Givetian) Ironstone Formation, Nw Anatolian Carbonate Platform, İsmai̇l Ömer Yilmaz, Mehmet Cemal Göncüoğlu, Di̇lek Gülnur Demi̇ray, İbrahi̇m Gedi̇k

Turkish Journal of Earth Sciences

Lower-middle Devonian iron-bearing successions were studied along 2 measured stratigraphic sections in the Çamdağ region of NW Anatolia. Ironstones in the upper part of the Fındıklı Formation in Kabalakdere are characterized by alternating red and green mudstones and sandstones at the bottom, followed by a series of dolomite, dolomitic limestone with oolitic ironstones, and chamositic mudstones at the top. Conodonts from these carbonates indicate the delta-pesavis zones of the late Lochkovian. The 12- to 45-m-thick Ferizli Formation unconformably overlies the Fındıklı Formation with a quartz-arenite succession at the bottom. The formation comprises alternating red, iron-rich limestones and dolomitic limestones, where …

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Discovery Of Hiatus In Feixianguan Formation And Its Geological Implications, Sichuan Basin, Sw China, Yang Yu, Xiucheng Tan, Peiyuan Chen, Huiting Yang, Teng Ma, Jian Cao, Xiuju Jin Jan 2015

Discovery Of Hiatus In Feixianguan Formation And Its Geological Implications, Sichuan Basin, Sw China, Yang Yu, Xiucheng Tan, Peiyuan Chen, Huiting Yang, Teng Ma, Jian Cao, Xiuju Jin

Turkish Journal of Earth Sciences

The lower Triassic Feixianguan Formation of the Sichuan Basin is an important exploration target for marine natural gas in China. It is widely believed that a certain interval from Fei 1 to Fei 4 displays conformable contacts rather than long-term wide-ranging hiatus. However, 2 denudational interfaces on the top of Member Fei 1 and Fei 2 respectively were found in the present work, which relies on the delicate core observation of 4 cored wells in Puguang Gas Field, microscopic observations of microsamples in terms of thin sections, scanning electron microscopy and cathodoluminescence, and geochemical testing. Evidence indicates that on the …

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Provenance, Diagenesis, Tectonic Setting, And Geochemistry Of Hawkesbury Sandstone (Middle Triassic), Southern Sydney Basin, Australia, Samir Mahmoud Zaid, Fahad Al Gahtani Jan 2015

Provenance, Diagenesis, Tectonic Setting, And Geochemistry Of Hawkesbury Sandstone (Middle Triassic), Southern Sydney Basin, Australia, Samir Mahmoud Zaid, Fahad Al Gahtani

Turkish Journal of Earth Sciences

The Hawkesbury Sandstone is an important groundwater reservoir in the southern part of the Sydney Basin, Australia. However, its diagenesis and provenance and its impact in reservoir quality are virtually unknown. The present study aims to reconstruct the parent rock assemblages of the Hawkesbury Sandstone, their tectonic provenance, and the physiographic conditions under which these sediments were deposited. Samples from the EAW 18a and EDEN 115 field representing the Middle Triassic Hawkesbury Sandstone were studied using a combination of petrographic, mineralogical, and geochemical techniques. The Hawkesbury Sandstone is yellowish brown in color, siliceous, and partly calcareous; it originated as sands …

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Evidence Of An Active Glacier In The Munzur Mountains, Eastern Turkey, Ci̇han Bayrakdar, Zeynel Çilğin, Mehmet Fati̇h Döker, Ergi̇n Canpolat Jan 2015

Evidence Of An Active Glacier In The Munzur Mountains, Eastern Turkey, Ci̇han Bayrakdar, Zeynel Çilğin, Mehmet Fati̇h Döker, Ergi̇n Canpolat

Turkish Journal of Earth Sciences

The Munzur Mountains were subjected to extensive and repeated glaciations during the Pleistocene. The presence of an active glacier in the region was not verified until this study. Here, we used remote sensing methods to identify and locate the glaciers and verified the activity of the largest glacier in the field. We named this glacier the Şahintaşı Glacier and studied it using 3D ArcGIS spatial analyses overlaid on high-resolution Geographical Information Systems (GIS) satellite images. The most current version of LANDSAT 8 (acquired on 14.08.2013) supplied the remote sensing information. We used principal component analysis on the data. The precise …

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Determining The Main Strand Of The Eskişehir Strike-Slip Fault Zone Using Subsidiary Structures And Seismicity: A Hypothesis Tested By Seismic Reflection Studies, Gürol Seyi̇toğlu, Gali̇p Berkan Ecevi̇toğlu, Bülent Kaypak, Yücel Güney, Muammer Tün, Korhan Esat, Uğur Avdan, Abi̇di̇n Temel, Alper Çabuk, Sevgi̇ Telsi̇z, Güzi̇n Gülsev Uyar Aldaş Jan 2015

Determining The Main Strand Of The Eskişehir Strike-Slip Fault Zone Using Subsidiary Structures And Seismicity: A Hypothesis Tested By Seismic Reflection Studies, Gürol Seyi̇toğlu, Gali̇p Berkan Ecevi̇toğlu, Bülent Kaypak, Yücel Güney, Muammer Tün, Korhan Esat, Uğur Avdan, Abi̇di̇n Temel, Alper Çabuk, Sevgi̇ Telsi̇z, Güzi̇n Gülsev Uyar Aldaş

Turkish Journal of Earth Sciences

The Eskişehir Fault Zone is one of the major neotectonic structures of Turkey, extending from İnegöl (Bursa) to Cihanbeyli (Konya). The fault zone presents a considerable seismic risk for the city of Eskişehir but the exact locations of active segments and the source of the major seismic event, the 1956 earthquake (M = 6.5) that occurred in the instrumental period (from 1900 to 2013), have been debated in recent literature. The structural data obtained from field studies indicate an approximately N60W-trending main strand of the right lateral strike-slip Eskişehir Fault Zone. This trend corresponds to the en echelon bends on …

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Inverse Problems In Theory And Practice Of Measurements And Metrology, Konstantin K. Semenov, Gennadi N. Solopchenko, Vladik Kreinovich Jan 2015

Inverse Problems In Theory And Practice Of Measurements And Metrology, Konstantin K. Semenov, Gennadi N. Solopchenko, Vladik Kreinovich

Departmental Technical Reports (CS)

In this paper, we consider the role of inverse problems in metrology. We describe general methods of solving inverse problems which are useful in measurements practice. We also discuss how to modify these methods in situations in which there is a need for real-time data processing.

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Minimax Portfolio Optimization Under Interval Uncertainty, Meng Yuan, Xu Lin, Junzo Watada, Vladik Kreinovich Jan 2015

Minimax Portfolio Optimization Under Interval Uncertainty, Meng Yuan, Xu Lin, Junzo Watada, Vladik Kreinovich

Departmental Technical Reports (CS)

In the 1950s, Markowitz proposed to combine different investment instruments to design a portfolio that either maximizes the expected return under constraints on volatility (risk) or minimizes the risk under given expected return. Markowitz's formulas are still widely used in financial practice. However, these formulas assume that we know the exact values of expected return and variance for each instrument, and that we know the exact covariance of every two instruments. In practice, we only know these values with some uncertainty. Often, we only know the bounds of these values -- i.e., in other words, we only know the intervals …

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Towards The Possibility Of Objective Interval Uncertainty In Physics. Ii, Luc Longpre, Olga Kosheleva, Vladik Kreinovich Jan 2015

Towards The Possibility Of Objective Interval Uncertainty In Physics. Ii, Luc Longpre, Olga Kosheleva, Vladik Kreinovich

Departmental Technical Reports (CS)

Applications of interval computations usually assume that while we only know an interval containing the actual (unknown) value of a physical quantity, there is the exact value of this quantity, and that in principle, we can get more and more accurate estimates of this value. Physicists know, however, that, due to uncertainty principle, there are limitations on how accurately we can measure the values of physical quantities. One of the important principles of modern physics is operationalism -- that a physical theory should only use observable properties. This principle is behind most successes of the 20th century physics, starting with …

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When An Idea Comes, Write It Down Right Away: Mathematical Justification Of Vladimir Smirnov's Advice, Olga Kosheleva, Vladik Kreinovich Jan 2015

When An Idea Comes, Write It Down Right Away: Mathematical Justification Of Vladimir Smirnov's Advice, Olga Kosheleva, Vladik Kreinovich

Departmental Technical Reports (CS)

Among several advices to students, Vladimir Smirnov, a renowned Russian mathematician, suggested that when an idea comes, it is better to write it down right away. In this paper, we provide a quantitative justification for this advice.

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Optimizing Pred(25) Is Np-Hard, Martine Ceberio, Olga Kosheleva, Vladik Kreinovich Jan 2015

Optimizing Pred(25) Is Np-Hard, Martine Ceberio, Olga Kosheleva, Vladik Kreinovich

Departmental Technical Reports (CS)

Usually, in data processing, to find the parameters of the models that best fits the data, people use the Least Squares method. One of the advantages of this method is that for linear models, it leads to an easy-to-solve system of linear equations. A limitation of this method is that even a single outlier can ruin the corresponding estimates; thus, more robust methods are needed. In particular, in software engineering, often, a more robust pred(25) method is used, in which we maximize the number of cases in which the model's prediction is within the 25% range of the observations. In …

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Why Right-Brain Cultures Are More Flexible: A Possible Explanation Of Yu. Manin's Observation, Olga Kosheleva, Vladik Kreinovich Jan 2015

Why Right-Brain Cultures Are More Flexible: A Possible Explanation Of Yu. Manin's Observation, Olga Kosheleva, Vladik Kreinovich

Departmental Technical Reports (CS)

Yuri Manin, a renowned mathematician, observed that it is much easier for a person raised in a right-brain culture to adjust to the left-brain environment than vice versa. In this paper, we provide a possible explanation for this phenomenon.

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How To Test Hypotheses When Exact Values Are Replaced By Intervals To Protect Privacy: Case Of T-Tests, Vladik Kreinovich, Christian Servin Jan 2015

How To Test Hypotheses When Exact Values Are Replaced By Intervals To Protect Privacy: Case Of T-Tests, Vladik Kreinovich, Christian Servin

Departmental Technical Reports (CS)

Researchers continuously look for possible relations between relevant quantities, e.g., relations which may help in preventing and curing diseases. Once a hypothesis is made about such a relation, it is necessary to test whether it is confirmed by the data. For such hypothesis testing, t-tests are most widely used. For example, a t-test can check, based on two samples, whether it is possible that they come from distributions with the same mean -- e.g., whether the average blood pressure after a proposed treatment is the same as before or it is provably smaller -- meaning that the tested treatment works. …

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2015 Oklahoma Research Day Full Program, Northeastern State University Jan 2015

2015 Oklahoma Research Day Full Program, Northeastern State University

Oklahoma Research Day Abstracts

This document contains all abstracts from the 2015 Oklahoma Research Day held at Northeastern State University.

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07. Criminal Justice, Northeastern State University Jan 2015

07. Criminal Justice, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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04. Botany, Northeastern State University Jan 2015

04. Botany, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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06. Computer Science, Northeastern State University Jan 2015

06. Computer Science, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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03. Biology, Northeastern State University Jan 2015

03. Biology, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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08. Engineering, Northeastern State University Jan 2015

08. Engineering, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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10. Forensic Science, Northeastern State University Jan 2015

10. Forensic Science, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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11. Genetics, Northeastern State University Jan 2015

11. Genetics, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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14. Optometry, Northeastern State University Jan 2015

14. Optometry, Northeastern State University

Oklahoma Research Day Abstracts

No abstract provided.

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