9909 research outputs found
Sort by
Performance of chaotic mapping multi-objective optimization algorithms
Full text linkMulti-objective optimization is defined as the process of producing suitable solutions to problems with multiple
objectives. The randomly generated string of numbers is of great importance in achieving solutions close to the global optimum
in intuitive multi- objective optimization. Collecting the randomly generated string of numbers in a certain area increases the
risk of moving away from the global optimum. Chaotic maps are used to reduce this risk it is not periodic as the variety of
numbers produced in chaotic maps is high. For this reason, chaotic maps are used in the random number generation part of
optimization algorithms. Chaos-based algorithms have become an important field of study because they are flexible and can
escape from local minimums. In this study, the effects of chaotic maps on the new and successful Multi-objective Gold Sine
Algorithm (MOGoldSA) were compared with the Multi-Objectıve Ant Lion Optimization (MOALO) algorithm
Excavatability classification of rocks around haroglu mountain in Northeast of Baskil in Elazig according to engineering geology properties
Full text linkAbstract
Knowledge of the geology of the ground to be excavated in surface mines and foundations, especially
in civil engineering works, is very important to decide on the appropriate excavation method and
equipment and ensure human and equipment safety with time and cost savings. For this purpose, the
engineering geological properties and excavatability classification of rocks around the Haroglu
Mountain located in the northeast of Baskil in Elazig were studied. The research started with a desktop
study and then continued with a walkover, the determination, and mapping of lithostratigraphic units
outcropping in this study area. Yuksekova Formation, Kuscular Formation, Seske Formation, Kirkgecit
Formation, and surficial deposits are the lithostratigraphic units in order of occurrence from old to
young. Yuksekova Formation, the oldest unit between them, makes up of a group of plutonic,
hypabyssal, volcanic, and pyroclastic rocks. After Yuksekova Formation occurs which is magmatic, the
sedimentary sequence begins to form with Middle Paleocene-aged rocks. Sedimentary rocks are
divided into three formations according to their stratigraphic properties. In order of occurrence from
old to young, these sedimentary formations are composed of Kuscular conglomerate, Seske Formation,
Kirkgecit Formation. Also, surficial deposits as the youngest unit are formed occasionally over other
formations. The structural geological properties of the formations, one of the most important
parameters of the excavability, were mapped. The set number, roughness, magnitude of the angle of
dip, azimuth of strike or dip of discontinuities or joints, and the block volume are the significant
parameters that are influenced excavatability. The azimuths of strikes of discontinuities were measured
and carried out the rose diagrams from them. As a result of these measurements, the discontinuities or
fractures in Yuksekova Formation have been usually found in the azimuth of a strike having NNE and
a 45-90 SW of angle and azimuth of dip. It was determined that the orientation of K60W of excavation
is the orientation of a very favorable excavation based on the discontinuity attitudes in the study area. It
was established that the orientation of a very unfavorable excavation also is in the azimuth of the strike
of fracture, namely N30E. Excavatability of the rocks was determined by assessment of lower and
upper discontinuity spacing index and point load strength values. Yuksekova Formation requires
methods that can be excavated from very hard to extremely hard ripping (D 9)–blasting by taking into
consideration formations exposed in the study area. Kuscular Formation can be excavated by methods
of easy ripping (D 6-D 7) to hard ripping (D 8) and Seske Formation also easy ripping (D 6-D 7)-very
hard ripping (D 9). Kirkgecit Formation has the capabilities of being excavated by methods of hard
digging (CAT 245) to very hard ripping (D 9). As a result of this study, the order of excavatability as
the rocks from hard to easy can be expressed as the micro-diorite, granite, andesite, and diorite of
Yuksekova Formation, the conglomerate of Kırkgecit Formation and the conglomerate of Kuscular
Formation. Finally, the limestone and shale of Kirkgecit Formation would be also excavated the easiest
respectively. Additionally, it has been revealed that surficial deposits can be also excavated optimally
by easy digging method
Drought assessment in Büyük Menderes Basin of Turkey
Full text linkDrought is one of the most important phenomenon related to the agriculture-food and
socio-economic problems all over the world. The Aegean region has a variety of water
resources, including but not limited to seacoasts, lakes, streams, and groundwater
aquifers. For this reason, the evaluation of historical and future drought events and their
effects on water resources is important in the planning and development of the region. In
this context, this study aims to evaluate the historical droughts in the inner Aegean
region. Monthly precipitation time series were used in three meteorology stations, which
are in the Büyük Menderes basin and have a continental climate, recorded between 1973
and 2020. First, to figure out whether the drought analysis is correct and dependable,
consistency, randomness, and trend in time series were investigated using the binary mass curve, run and linear trend tests. Next, the standardized precipitation index SPI is used in conjunction with the moving average (MA) operator to evaluate the historical gap
associated with meteorological (SPI-1), agricultural (SPI-3), and hydrological (SPI-6 and
SPI-12). Finally, the results are evaluated based on the behavior of the SPI time series at
different time intervals.Yaşar Üniversites
Evaluation of streamflow drought index in Aegean region, Turkey
Full text linkWater is an invaluable substance that ensures the life cycle and
hydrological events across the world. In this respect, water deficit also known as
drought is a natural disaster-related to water scarcity in time and space. Although
there is no solid definition for the phenomenon, the outcome of repeated wet and
dry spells causes economic, social, and political problems on a regional, countrywide, and worldwide scale. In this study, drought associated with the streamflow
in the Aegean region, which has an important economic, historical and socio-cultural role in western Turkey, is investigated through the well-known
streamflow drought index (SDI). Therefore, average discharge in the Çiçekli-Nif,
Beşdeğirmenler-Dandalas, Bebekler-Rahmanlar and Koçarlı-Köprübaşı station
respectively related to on Gediz, Büyük Menderes and Küçük Menderes basins
were used. Then SDI with 1, 3, 6,12 months moving average is acquired to
express the drought severity associated with the streamflow in the basins. Results
showed that the SDI values in all of the stations together with the 1, 3, 6, and 12-
month moving averages depicts similar results and no abnormal situation exists
during the study period.Yaşar Universit
2000'li yılların başında İmam Hatip Lisesi öğrencilerinin yaşadıkları sorunlar
Full text linkBu çalışmada 2000’li yılların başlarında İmam-Hatip Lisesi öğrencilerinin sorun ve beklentileri ortaya konulmuştur
Türbülatörlü bir ısı eşanjöründe titreşimin ısı transferi ve basınç düşüşüne etkisi
No full textIn the present study effects of forced mechanical vibration on a concentric pipe heat exchanger with turbulator inside it, is experimentally analyzed. Three different zigzag shaped turbulators are used in the concentric type heat exchanger. Air is preferred as the working fluid with inlet Reynolds numbers varying from ~10,000 to ~55,000. The effect of vibration on heat transfer and pressure drop is tested by using a mechanical vibration test unit. The variable parameters of the vibration phenomena are considered to be acceleration (amplitude) (a =100, 300 and 600 m/s2), frequency (F =100, 300 and 600 Hz) and signal type (sine, chirp and random noise). Effects of the vibration on heat transfer are shown by means of thermal performance factor (η) which includes Nusselt number and friction factor in the same formula. As a result, it is observed that, regardless of the variation of the frequency, acceleration or signal type, applying vibration to the turbulator increases the heat transfer and pressure loss simultaneously. For example, the highest heat transfer enhancement is found as 116% whilst the maximum enhancement per-centage of the friction factor is about 95%. It is also found that increasing frequency has more effect than increasing acceleration or changing signal types
Assessment of drought in Izmir district using standardized precipitation index
Full text linkDroughts are one of the major concerns associated with agro-food and socio-economical security in the World. The continuously changing climate regardless of its cause and effect
pushes the limit of the water deficit to the limits. Izmir is a raising city of Turkey that owns various water resources including but not limited to seashores, lakes, river streams, and groundwater reserves. Therefore, the assessment of the historical and future drought events and their potential effect on these water resources is important in the planning and development of the region. In this respect, this study aims to evaluate the historical droughts across İzmir District. For this, monthly precipitation time series in three meteorological stations recorded between 1973-2020 related to the Küçük Menderes basin is used. First, the consistency, randomness, and trend in the time series are investigated using the double mass curve, run test, and linear trend analysis, respectively to ensure the credibility of the posterior drought analysis. Next, the standardized precipitation index (SPI) together with the moving average (MA) operator is used to evaluate the historical deficit associated with meteorological (SPI-1), agricultural (SPI-3), and hydrological (SPI-6 and SPI-12) droughts within a year. It is concluded that there is no permeant drought occurred during the study period, while there are some extreme events in the past that should be evaluated separately. Results also showed that the severity of drought increases from the seashore toward the land.Yaşar Universit
6 Ocak baskını sonrasında Trump’ın ardından Amerika Birleşik Devletleri’nin dünyadaki kurumsal diplomasisi üzerine bir inceleme
Full text linkAmerika Birleşik Devletleri’nde 6 Ocak 2021 günü, ülkenin 46. Başkanı Joe Biden’ın zaferinin Kongre tarafından ilan edilmesi beklenirken, başkanlık yarışını kaybeden 45. Başkan Donald Trump’ın kışkırtmasıyla kalabalık bir grup ülkenin kongre binasını bastı. Kongre binasının basılmasında Donald Trump’ın rolü olduğu gerekçesiyle Twitter başta olmak üzere birçok sosyal medya platformu, Trump’a erişim engeli getirerek onu platformlarından atma kararı aldılar. Twitter engelinin ardından Trump taraftarları ve protestocular Parler isimli bir sosyal medya uygulamasına yöneldiler. Bu uygulamaya da bazı uygulama dükkânlarından birtakım engeller getirildi. Bununla birlikte eşzamanlı olarak WhatsApp’ın veri uygulamasını güncellemesi ve veri paylaşımını taşıması
gündeme geldi. Trump’ın ve şiddet eylemlerini gerçekleştiren protestocu destekçilerinin nefret söylemi içeren paylaşımlarına dünyadaki özgürlük yanlısı sosyal medya destekçileri tepki gösterdiler. Bu araştırmada, sosyal medya platformlarının kamusal alanda oynadıkları role bir örnek olan, dünyanın süper gücü ABD’nin 45. Başkanı Donald Trump’ın başkanlık yarışını kaybetmesinin akabinde, 46. Başkan Joe Biden ile birlikte yeni dönemde ülkede ve dünyada ABD’nin kurumsal ve diplomatik iletişiminin nasıl şekilleneceği, sosyal medya destekli 6 Ocak 2021 baskını ekseninde analiz edilmiştir
Petrographic and geochemical characteristics of late cretaceous plutonic rocks outcropping western Pertek (Tunceli): First findings
No full textThis study, it was aimed to reveal the petrogenesis of the related rocks by examining the petrographic and geochemical properties of the plutonic rocks belonging to the Elazig Magmatic Complex outcropping in the Western Pertek district of Tunceli province. The geological formations in the study area are Carboniferous−Triassic Keban Metamorphics, Late Cretaceous Elazığ Magmatic Complex, Middle Eocene−Late Oligocene Kırkgeçit Formation and Late Miocene Karabakır Formation. Plutonic rocks of Elazig Magmatic Complex are in tectonic contact with Keban Metamorphics. The studied plutonic rocks are petrographically in the composition of medium-coarse grained granite, granodiorite, diorite, monzodiorite, quartz monzodiorite and quartz monzonite. These rocks generally exhibit granitic, porphyric holocrystalline, poikilitic and graphic textures. Studied rocks are ranging from tholeiitic to high-K calc-alkaline in composition and are I-type granite characters. K and Rb show positive anomalies, whereas high field strength elements such as Nb, Ta and Ti show negative anomalies in the primitive-mantle-normalised spider diagrams. These distributions in trace elements indicate that the subduction component plays a role in the petrogenesis of the related rocks. Light rare earth elements are more enriched than heavy rare earth elements in the chondrite-normalised spider diagrams. The negative Eu anomaly (Eu/Eu*=0.10−0.17) seen in the samples indicates plagioclase fractionation or retention of plagioclase in the source rock during partial melting. Particularly the high average Nb/Ta (7.28), Zr/Hf (25.11), Th/U (6.98) and Th/Ta (10.11) ratios indicate a crustal origin in the formation of these rocks. Volcanic arc granites/post-collisional field is suggested for the tectonic environment of the investigated igneous rocks
Parçacık sürü optimizasyonu kullanılarak etkili bir lineer geri beslemeli kaydırma yazmaç yapısı
Full text linkÖzet Rasgele bir dizi üretmek birçok uygulamada önemli bir gereksinimdir. Rastgele görünümlü diziler elde edebilmek için en yaygın kullanılan yöntemlerden biri doğrusal geri beslemeli kaydırma yazmaç yapılarıdır. Ancak bu yapılar ile uzun rasgele sayı dizileri elde etmek zor bir görevdir. Çünkü üretilecek dizinin uzunluğu tasarımda kullanılan flip-flop sayısı ile bağlantılıdır. Belirli bir değerden sonra tasarım sürecinde seçilecek konfigürasyonlara karar vermek NP hesaplama karmaşıklığına sahiptir. Bu çalışmada bu hesapsal karmaşıklık problemi bir sezgisel yaklaşım olan parçacık sürü optimizasyon algoritması ile çözülmeye çalışılmıştır. Elde eilen sonuçların başarısı çeşitli istatistiksel testler ile doğrulanmıştır. Başarılı çıktıların ileride birçok pratik uygulamada başarılı olarak kullanılabileceğine inanılmaktadır