1155 research outputs found
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Design and Development of Interactive Multimedia Listening Software
No full textDesign and Development of Interactive Multimedia Listening Software explores the latest research-based development and design innovations for multimedia listening programs to assist students in second-language learning programs. Emphasizing revolutionary tools in the area of computer-assisted language learning, this video is a critical reference source for educators, instructional designers, curriculum specialists, and those seeking to improve the efficacy of foreign language acquisition courses and programs
Investigation of chemical effect on the absorption parameters for some selected indium complex at 59.54 keV photon energy
No full textIn this work, the mass attenuation coefficients, molecular, atomic and electronic cross sections, effective atomic numbers and electron densities of some selected indium complexes such as C5H10InNO9, C3H6InNO9 and C9H10InNO9, were determined with experimentally and theoretically using transmission geometry at 59.54 keV photon energy which emitted from 241Am annular source. The results were compared with the theoretical calculations which obtained from the WinXCOM program. Also, the results were interpreted based on some chemical parameters such as energy gap, ionization energy, electron affinity, hardness, chemical potential, electronegativity and global electrophilicity values of malonate, 2, 2 dimethylmalonate and phenylmalonate which were calculated using the density functional theory (DFT/B3LYP)
Highly active and long lived homogeneous catalyst for the dehydrogenation of dimethylamine borane starting with ruthenium(III) acetylacetonate and oleylamine precatalyst. 411, 9-18.
No full textHerein, we report the results of our study on the homogeneous catalytic dehydrogenation of dimethylamine borane in the presence of Ru(acac)(3) and oleylamine (OAm) in toluene solution. The precatalyst system comprising Ru(acac)(3) and 3 equivalent OAm shows the high catalytic activity in hydrogen generation from dimethylamine borane solution. Monitoring the hydrogen evolution shows the presence of an induction period during which the homogeneous catalyst is formed, and then the hydrogen evolution continues almost linearly until the complete dehydrogenation of dimethylamine borane. UV-vis spectroscopic observation implies on the formation of a ruthenium(II)species. Using UV-vis, FTIR, Mass, H-1 and C-13 NMR spectroscopies we could identify the presence of trans-[Ru(acac)(2)(OAm)(2)] in the solid residue obtained after the catalytic reaction. This complex might be a stable form of the active catalyst as it shows similar catalytic activity in dehydrogenation of dimethylamine borane as before. The precatalyst system comprising Ru(acac)(3) and 3 equivalent OAm provides 15,000 turnovers over 8 days with a constant turnover frequency of TOP = 77.8 h(-1) in hydrogen generation from the dehydrogenation of dimethylamine borane in toluene solution at 60.0 +/- 0.1 degrees C. Adding 3 equivalent OAm per Ru into the precatalyst solution increases the catalytic activity by a factor of similar to 5 and the lifetime of the catalyst by a factor of >9 compared to the ones obtained by using sole Ru(acac)(3). Kinetics of catalytic dehydrogenation of dimethylamine borane starting with Ru(acac)(3) and 3 equivalent OAm in toluene solution were studied depending on catalyst concentration, substrate concentration and temperature. The catalytic reaction was found to be first-order with respect to each of both Ru(acac)(3) and dimethylamine borane concentrations. The activation energy for the catalytic dehydrogenation is E-a = 58 +/- 2 kJ/mol.Turkish Academy of Sciences
TUBITAK 221
Essential Oil Composition and Antioxidant Activity of Saponaria prostrata WILLD. subsp. anatolica HEDGE
No full textIn this study, we investigated the chemical composition and antioxidant activity of the essential oil of Saponaria prostrata WILLD. subsp. anatolica HEDGE. The essential oil of plant was obtained by hydrodistillation method and analyzed by HS-SPME/GC-MS. Thirty nine compounds were identified, which representing 91.77% of the oil. Among them Palmitic acid (36.53%), Pentanal (17.38%), 2-Pentadecanone, 6,10,14-trimethyl (9.68%), 2,6,10-Trimethyl,14-Ethylene-14-Pentadecne (5.96%) and 1,8-Diazacyclotetradecane-2,9-dion (4.64%) were the major compounds. The antioxidant capacity of S. prostrata subsp. anatolica was evaluated by different methods and results were compared with BHA, BHT, vit.E, vit. C, EDTA and trolox
Determination of K-Li Sub-Shell, Total K-L and Total K-M shell Vacancy Transfer Probabilities for Europium, Gadolinium and Terbium
No full textThere are different ways to produce a vacancy in an atom such as photoelectric effect, Compton scattering, triplet production, charged particle Coulomb interaction, internal conversion, electron capture, positron annihilation and Auger effect. If an atom is bombarded with photons, electrons or protons which have enough energy for the ionization, the shell electron leaves the electronic cloud and the atom loses an electron through creation of a vacancy. The vacancy is filled either by emission of an X-ray, by Auger transition or Coster-Kronig transition which is special case of the Auger transition. These transitions are called radiative and non-radiative processes, respectively. In this work, to obtain the K-Li (i=2,3), total K-L and total K-M shell vacancy transfer probabilities for Europium, Gadolinium and Terbium elements, the experimental values of Kα1, Kα2, Kβ'1 and Kβ'2 X-ray production cross sections, K shell fluorescence yields and Kβ/Kα, Kα2/Kα1 and Kβ'1/ Kα1 intensity ratios were determined at 59.54 keV photon energy from a 100 mCi Am241 annular source using excitation geometry and a Si(Li) detector system. The experimental results were compared with theoretical values of Hartree-Slater and Hartree-Fock and other available experimental results
Essential oil composition of endemic Pimpinella tunceliana Yıld. from Turkey for the first time
No full textThe objective of this study was to examine the essential oil of Pimpinella tunceliana Yıld. growing wild in the Eastern part
of Turkey for the first time. Obtained results were discussed with the genus patterns and natural products. The essential oil of P.
tunceliana was analyzed by head space-solid phase microextraction (HS-SPME)/gas chromatography-mass spectrometry (GC-MS)
technique, and 50 compounds were identified, representing 96.3% of the oil. The main constituents of P. tunceliana were
β-caryophyllene (13.9%), β-bisabolene (10.4%), anethole (9.3%), sabinene (7.5%), limonene (6.9%) and germacrene D (6.8%). In
this study, essential oil contents of P. tunceliana that is a new and endemic species was studied for the first time, and important
results were presented in respect to the composition of the oil of this new species of Pimpinella
Bir mutasavvıf olarak Osman Bedrüddin Erzurumi'nin (1858-1922) tasavvuf düşüncesi bağlamında "insan-ı kamil" anlayışı
No full textOsman Bedrüddin Erzurumi, Sohbetler adlı eserinde, "kalbi amellerin zerre kadarı zahiri amellerin dağlar kadarından büyüktür diyerek, kalbi paslanıp çürümekten kurtarmak esastır" demiştir. Kalbi amellerin nefs ve şeytan tarafından sevilmeyen işler olduğunu, Allah'ı zikirle meşgul olmanın "Hakikat-i insaniyyenin" aslına ulaşmaya vesile olacağını ifade etmektedir. Bu ve buna benzer görüşleriyle dikkatimizi çeken Erzurumi, Harput'ta yaşamış devrinin hem bir ilim adamı hem de bir askeri şahsiyetidir. Tabii en önemli hususiyeti sufı bir hayata sahip olmasıdır. Tasavvuf; insanı merkez alan bir ilim olarak, Hakk için halka hizmeti temel düstur kabul etmiştir. Tasavvufta, insanın gönlüne girmeyi her şeyden üstün tutan, yaratan uğruna kâinatta bütün yaratılmışları seven, sûfî anlayışı her devirde rağbet görmek vardır. Engin bir hoşgörü anlayışı asırlar boyu süregelmiş, bütün insanlığı saran bir hava içerisinde Hakka ve hakikate davet metodu olarak uygulanmıştır.Fırat Üniversitesi, Elazığ Valiliği, Elazığ Belediyesi
Bir alim, abit ve mütefekkir olarak İskilipli M. Atıf Efendi (1876 -1926 m.)
No full textBir alim, abit ve mütefekkir olarak İskilipli M. Atıf Efendi (1876-1926)
Özet: Atıf Efendi Akkoyonlu aşiretinden ve İmamoğulları denilen aileden
Mehmed Ali ağanın oğlu olup, 1292 hicri senesinde Çorum’un İskilip
kazasının Tophane köyünde dünyaya gelmiştir. Annesi Mekke-i
Mükerremeden göç etmiş Ben-i Hattap aşiretinden, Arap dedenin
torunlarından Nazlı hanımdır. Altı aylıkken öksüz kalan Mehmed Atıf,
dedesi Hasan Kethüda efendinin himayesinde yetişmiştir. Büyük babası
Hasan Kethüda efendinin himmetiyle evvela köy hocasından başladığı
tahsiline 1891 yılından itibaren iki sene İskilip’te, müderris Hoca Abdullah
Efendi nezaretinde devam etmiştir. 1893 nisanında ailesinin karşı çıkmasına
rağmen İstanbul’a geldi ve medrese tahsiline burada devam etti. Meşhur
Çarşambalı hocanın rahle-i tedrisine oturdu. Medresede daha çok ‚İskilipli
Mehmed‛ olarak anılırdı.1902’de medrese eğitimini iyi derece ile bitti ve
aynı yıl açılan Ruus imtihanına (bir nevi mesleki kariyer sınavı) girerek
İstanbul müderrisliğini (Profesör) kazandı, ertesi sene Fatih Camiinde ders
vermeye başladı. Bu arada İstanbul Dar-ül Fünunun İlahiyat Fakültesine
girdi ve 1905’te buradan mezun olarak Kabataş Lisesi Arapça muallimliğine
atandı. Mehmed Atıf Efendi Cumhuriyet döneminde olduğu gibi,
Meşrutiyet öncesi ve sonrasında da çeşitli garazkarların yanlış tevil ve
nazarları yüzünden taşlanıp durdu. Meşihat –ı İslamiye dairesinde bulunan
dersiamların mağduriyetini giderme konusunda yaptığı çalışmalar üzerine
devrin Şeyhülislam’ı tarafından Bodrum’a sürüldü. Üzerinde yoğunlaşan
baskılar yüzünden Kırım’lı İbrahim Tali Efendi’nin pasaportu ile gizlice
Kırım’a geçti. Kırım’dan Varşova’ya kadar gitti. Meşrutiyet’in ilanından bir
hafta evvel İstanbul’a geri döndü. 1910’da medreselerin genel müfettişliğine
getirildi. Fazileti ve ilmi İstanbul’un her tarafına yayıldı, hatta yurtdışına
kadar taştı
Seed Fatty Acid Composition of Some Medicago L. and Melilotus L. (Fabaceae) Taxa From Turkey
No full textFatty acids composition of plant oil of Medicago disciformis DC., Medicago orbicularis
(L.) Bart., Medicago intertexta (L.) Mill var. ciliaris (L.) Heyn., Medicago scutellata (L.) Mill., Melilotus
alba Desr. and Melilotus officinalis (L.) Desr. were analyzed. The fatty acid composition of these six different
taxa were determined by gas chromatography. The fatty acid composition of plants used to this study showed
different saturated and unsaturated fatty acid concentrations. The main fatty acids found were linoleic acid
(19.43-56.25 %), linolenic acid (22.10-36.35 %), oleic acid (18.56-31.21 %), stearic acid (3.16-5.09 %) and
palmitic acid (11.93-23.37 %); while other fatty acids were found in minor proportions. As a result, present
study determined that all taxa had the highest total unsaturated fatty acid amounts (69.81-82.53 %) and the
lowest total saturated fatty acid amounts (17.47-30.19 %). The higgest unsaturated fatty acid determinated to
Melilotus officinalis (82.53 %), the lowest in Medicago intertexta (69.81 %). In the study of species, palmitic
and stearic acid were found, the major saturated fatty acids. The other hand oleic, linoleic and linolenic acids
in major unsaturated fatty acids. Fatty acid composition of studied plants oils could be used as a
chemotaxonomical marker