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Bulunan: 818 Adet 0.004 sn
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Filtreler
Bulunan: 818 Adet 0.004 sn
Koleksiyon [20]
Tam Metin [2]
Yayın Türü [11]
Yazar [20]
Yayın Yılı [20]
Konu Başlıkları [20]
Yayıncı [20]
Yayın Dili [2]
Dergi Adı [20]
Editör/Editörler [15]
Comparison of Shear Bond Strengths of Ceramic Brackets Using Either Self-etching Primer or Conventional Method After Intracoronal Bleaching

Çakmak, Fethiye | Koçak, Sibel | Koçak, Mustafa Murat | Elekdağ-Türk, Selma | Türk, Tamer

Article | 2015 | TURKISH JOURNAL OF ORTHODONTICS28 ( 2 ) , pp.48 - 54

Objective: To evaluate initial shear bond strengths (SBSs) of ceramic brackets using either a self-etching primer (SEP) or the conventional method (CM) after intracoronal bleaching with sodium perborate and distilled water. Materials and Method: Eighty human incisors were divided into 4 groups according to bleaching and bonding procedures: group 1, bleaching was not applied and brackets were bonded with SEP; group 2, bleaching was not applied and brackets were bonded with the CM; group 3, intracoronal bleaching with sodium perborate was applied for 3 weeks and brackets were bonded with SEP; group 4, intracoronal bleaching with sodiu . . .m perborate was applied for 3 weeks and brackets were bonded with the CM. The SEP (Transbond Plus) was applied as recommended by the manufacturer. After SEP application, ceramic brackets were bonded with light cure adhesive (Transbond XT). For the CM, the teeth were etched with 37% phosphoric acid. After etching, a thin uniform coat of primer (Transbond XT Primer) was applied and ceramic brackets were bonded with light cure adhesive (Transbond XT). The SBSs were measured after water storage for 30 days, after 1000 cycles of thermocycling between 5 degrees C and 55 degrees C. Bond failure location was determined with the adhesive remnant index (ARI). Results: For the SEP method, there was no significant difference between the SBS values of the bleaching and nonbleaching groups. Furthermore, for the CM, the SBS value of the nonbleaching group was not significantly different from that of the bleaching group. The SBS values of the SEP method presented significant differences from the SBS values of the CM (p < 0.001). The SBS values of the SEP application decreased with and without bleaching. ARI scores did not show any significant difference between the groups (p = 0.174). Conclusion: Intracoronal bleaching with sodium perborate and distilled water did not affect the SBS values of ceramic brackets Daha fazlası Daha az

2019-12-23

Dölek, Sever, Deniz

Article | 2017 | MIDDLE EASTERN STUDIES53 ( 4 ) , pp.533 - 550

During the First World War, a primary domestic political aim for all belligerent countries was to preserve the socio-economic status quo in order to provide appropriate conditions for the survival of the state. Therefore, war governments paid particular attention to the maintenance of internal order. While doing this, the central authority of governments became paramount and this situation had remarkable repercussions on state-society relations. This article examines the wartime public order policies of the Ottoman government specifically concerning the Ottoman Greeks (Rum) and Armenians living in Istanbul. During the Great War, the . . .se non-Muslim elements were officially regarded as suspects', in other words, as potential political criminals' threatening the internal order of the capital. To control the Ottoman Greeks and Armenians, the war government implemented a number of policing strategies that consisted of deportation of individuals and groups, strict control on travel, and close surveillance of suspects' Daha fazlası Daha az

Alglerin gıda veya gıda bileşeni olarak kullanımı ve sağlık üzerine etkileri

Sasa, Aybüke | Şentürk, Fatiha | Üstündağ, Yeşim | Erem, Fundagül

Article | 2020 | Uluslararası Mühendislik Tasarım ve Teknoloji Dergisi2 ( 2 ) , pp.97 - 110

Artan nüfusla birlikte karşılaşılabilecek gıda yetersizliği ve dengesiz beslenme gibi sorunlar insanoğlunu alternatif kaynaklar bulmaya itmiştir. Bu bağlamda, algler sürdürülebilir gıda arzını sağlayabilmenin yanı sıra, yüksek besin içerikleri ve sağlık açısından faydalı yönleriyle dikkat çekmekte ve bu özellikleriyle aynı zamanda fonksiyonel gıda olmaya aday ürünler olarak değerlendirilmektedir. Alglerin ürettiği fonksiyonel bileşenlerin ilave edildiği gıdaların günlük olarak tüketilmesi sağlığı iyileştirip kronik hastalık riskini azaltabilmektedir. Asya ülkelerinde yüzyıllardır gıda olarak değerlendirilen algler artık dünyanın hem . . .en hemen her bölgesinde gerek doğrudan gıda gerekse gıda katkı maddesi veya gıda takviyesi olarak kullanılmaya başlanmıştır. Algler gıda endüstrisi dışında tıp, eczacılık, tarım, hayvan beslenmesi, atıkların arıtılması, kozmetik, biyodizel üretimi gibi pek çok alanda yararlanılan önemli kaynaklar arasında yer almaktadır. Bu derlemede alglerin genel özellikleri, önemli bileşim öğeleri, doğrudan gıda olarak ya da gıdalarda kullanımlarına yönelik ve sağlığa faydalarıyla ilgili bilgiler özetlenmiştir Daha fazlası Daha az

Membrane potentials for linearly varying fixed charges

Genç, Ayten

Article | 2009 | Turkish Journal of Engineering and Environmental Sciences33 ( 1 ) , pp.73 - 81

The membrane potentials for asymmetric membranes where fixed charges varied linearly with position were evaluated from the numerical solutions of Nernst-Planck flux and Donnan potential equations. The evaluated membrane potentials were compared with the results obtained from the conventional TMS theory where the fixed charge concentration in the membrane was assumed to be uniform. In the comparison, the number of fixed charges was kept constant by defining an average for the fixed charge concentration. The numerical results showed that the membrane potential increased in magnitude when the distributions of fixed charges at the membr . . .ane-solution interfaces were unequal. In addition, the deviation from TMS theory increased more as the charge difference at the interfaces increased. © TÜBİTAK Daha fazlası Daha az

Mineral trioksit agregat'ın biyouyumluluğunun değerlendirilmesi

Koçak, Sibel | Erten, Hülya

Article | 2012 | Gazi Üniversitesi Diş Hekimliği Fakültesi Dergisi (.Acta Odontologica Turcica)29 ( 1 ) , pp.63 - 71

Mineral trioksit agregat (MTA), kök ucu dolgusu, pulpa kaplaması, perforasyon tamiri ve diğer endodontik yaklaşımlarda yaygın olarak kullanılmaktadır. MTA'nın biyouyumluluğu çok çeşitli yollarla; hücre baskılanması ve büyümesi, in vivo olarak cilt altı ve kemik içi implantasyon ve dental dokularla direkt temas yöntemleriyle araştırılmıştır. Bu derlemenin amacı, MTA'nın biyouyumluluğu hakkındaki genel bilgileri güncellemektir. Mineral trioxide aggregate (MTA) is widely used for root-end fillings, pulp capping, perforation repairs, and other endodontic procedures. The biocompatibility of MTA has been investigated in a number of ways, . . .using cell expression and growth, subcutaneous and intra-osseous implantation and direct contact with dental tissues in vivo. The aim of this review is to update the general knowledge about the MTA biocompatibility Daha fazlası Daha az

Emirati women's experience of job satisfaction: Comparative effects of intrinsic and extrinsic

Seydahmet, Ercan

Article | 2018 | SOUTH AFRICAN JOURNAL OF BUSINESS MANAGEMENT49 ( 1 ) , pp.63 - 71

Living and working in a patriarchal culture that encourages modesty, female Emirati employees might face unique challenges such as a male-dominated work environment, higher emotional labour and lack of role models to follow. These challenges potentially shape Emirati women's job-related attitudes and values in a way distinct from that of Western women. Thus, rather than relying on the results of studies conducted in Western countries, researchers should collect data from Emirati women to gain a more accurate understanding of their job attitudes. Consequently, this study examines the effects of some intrinsic and extrinsic factors on . . . Emirati women's job satisfaction. The factors include pay, promotion opportunities, job security, job difficulty, job content quality and interpersonal relations. The results of a hierarchical regression analysis based on data obtained from 364 female Emirati employees indicate that pay and promotion opportunities do not have significant effects, whereas job security, job content quality and interpersonal relations have significant positive effects, and job difficulty has a significant negative effect on Emirati women's job satisfaction. The results further indicate that intrinsic factors explained 10% of variance in job satisfaction above and beyond the extrinsic factors and promotion opportunities. The article discussed the possible meaning of these findings in the context of working in a male-dominated work environment and living in a culture that encourages and values modesty Daha fazlası Daha az

Effects of acceptor phase and donor phase properties on sodium ions transport from aqueous solutions using liquid membrane systems

Altın, Süreyya | Demircioğlu, Nuhi | Peker, İbrahim | Altın, Ahmet

Article | 2007 | Colloids and Surfaces A: Physicochemical and Engineering Aspects306 ( 1-3 SPEC. ISS. ) , pp.14 - 21

In this study, the effects of the acceptor phase and the donor phase properties on sodium ion transport were examined in bulk liquid membrane systems. In the experiments, toluene and a mixture of toluene-dichloromethane (90-10%, v/v) containing 1 × 10-3 M DB18C6 (dibenzo18crown6) was used as the membrane. In order to examine the effects of different the acceptor phases, firstly H2SO4, HCl, HNO3, CH3COOH and distilled water were used as the acceptor phases. Furthermore, the experiments were performed by using various acid concentrations such as 2, 0.2 and 0.02 M of acids, as the acceptor phase. In the second part of the study, the ef . . .fect of donor phase on sodium ion transport was examined. For this examination, Na2SO4, NaNO3, NaOH and NaCl were applied. In order to determine the effect of the donor phase concentration, the experimentation was performed using 1.08 × 10-2, 2.17 × 10-2, 3.26 × 10-2 and 4.34 × 10-2 M concentrations of Na+ in form of NaCl. Finally, nonsteady-state kinetics was applied on all data obtained from the experiments and reaction constants (k1, k2, and k3) and the values of the Rmax, tmax, k1/k2 were calculated. Consequently, it was determined that the type and the concentration of the acceptor phase and the donor phase solutions were significant for transport efficiency in liquid membrane systems. The most efficient transport was obtained by applying 2 M H2SO4 and 2.17 × 10-2 M Na+ in form of NaCl. Besides, It was observed that there was a significant effect of the anion attached to the cation on transport efficiency. © 2007 Elsevier B.V. All rights reserved Daha fazlası Daha az

Sünmüş ekmekten izole edilen Bacillus suşlarının peptidaz üretme potansiyellerinin belirlenmesi ve peptidaz üretimi için bazı kültür şartlarının optimizasyonu

Erem, Fundagül | Certel, Muharrem

Article | 2018 |

Bu çalışmada daha önceki bir çalışmada sünmüş ekmeklerden izole edilen 14 adet Bacillus suşunun, 30 °C, 37 °C, 50 °C ve 55 °C’de peptidaz üretme potansiyellerinin belirlenmesinin ardından, peptidaz aktivitesi en yüksek olan iki suş için en uygun enzim üretim besiyeri bileşimi ve koşullarının bir kerede bir faktör yaklaşımı ile optimizasyonu yapılmıştır. Bu amaçla en iyi aktivite değerini sağlayan karbon ve azot kaynağı ile karbon/azot oranı, çalkalama hızı ve ön kültür besiyeri seçimi maliyet unsuru da göz önünde bulundurularak tespit edilmiştir. En iyi karbon ve azot kaynağının sırasıyla glukoz ve maya ekstraktı olduğu saptanmıştır . . .. Ayrıca karbon/azot oranının 1:5, çalkalama hızının 250 rpm olması durumunda ve ön kültür hazırlanması için enzim üretim ortamı ile aynı besiyeri kullanıldığında daha yüksek peptidaz aktivitesi değeri elde edilmiştir Daha fazlası Daha az

Türkiye’de uluslararası öğrenciler

Özer, Mahmut

Article | 2012 | Yükseköğretim ve Bilim Dergisi2 ( 1 ) , pp.10 - 13

Son yıllarda dünya genelinde sayıları üç milyonun üzerinde olan uluslararası öğrencileri kendi ülkelerinin yükseköğretim kurumlarına alabilmek için ülkeler kıyasıya rekabet etmektedirler. Uluslararası öğrenciler, artık yükseköğretim sistemleri ve kurumlarının uluslararasılaşma boyutlarının en önemli göstergelerinden birisini oluşturmaktadır. Bu bağlamda, yükseköğretim sistemimiz ve kurumlarımızın bu göstergesinin ne durumda olduğunun tespiti, oldukça büyük bir genişleme yaşayan yükseköğretim sistemimiz açısından büyük önem arz etmektedir. Bu çalışmada, ülkemizdeki uluslararası öğrencilerin durumu ele alınmaktadır There are over thre . . .e million international students worldwide, and in recent years higher education institutions compete with each other in order to receive these students to their institutions. International students are now one of the most important indicator of the internationalization of the higher education systems and institutions. In this context, the detection of the status of this indicator in our higher education system and institutions is of great importance as our higher education system shows a large expansion. This study, discusses the status of international students in our countr Daha fazlası Daha az

Experimental studies on the effect of electrode configuration in electrofiltration

Genç, Ayten | Tosun, İbrahim

Article | 2002 | Separation Science and Technology37 ( 13 ) , pp.3053 - 3064

Results from the electrofiltration of anatase (TiO2) particles in a water suspension and using three different electrode configurations are presented. The three electrode configurations studied were spot, foil, and mesh. For the first two configurations, the electric field was perpendicular to the direction of flow while for the mesh configuration it was opposite to the direction of flow. The percent gain volume filtrate and power consumption were measured for each electrode configuration. For a given percent gain volume filtrate, it was observed that the foil electrode configuration consumes the least power.

Estimation of the propagation of flexural waves in thin plates using a single low-cost sensor

Onur, Tuğba Özge | Carlson, Johan E | Svanström, Erika | Hacıoğlu, Rıfat

Article | 2019 | Iranian Journal of Science and Technology - Transactions of Electrical Engineering43 ( 3 ) , pp.405 - 413

This paper demonstrates how flexural wave propagation in a thin plate can be modeled by estimating the combined effect of the excitation source signal and the impulse response of the ultrasonic sensor. The wave propagation in the plate is modeled using the wave equation for the flexural wave mode. A theoretical model for flexural wave propagation in thin plates has been derived, and it has been compared with measurements excited by tapping gently on the surface. The combined effects of the excitation source signal and the impulse response of the low-cost piezoelectric sensor are modeled using finite-impulse response and/or infinite- . . .impulse response filters. Thereafter, the performances of the selected filters are compared on estimating the wave propagation in a thin quartz glass plate. Results indicate that the most accurate estimation of wave propagation has been obtained using a linear phase filter which attributes all dispersions to the flexural wave. © 2018, Shiraz University Daha fazlası Daha az

DNA gyrase inhibitors: Novobiocin enhances the survival of Pimpla turionellae (Hym., Ichneumonidae) larvae reared on an artificial diet but other antibiotics do not

Büyükgüzel, Kemal

Article | 2001 | Journal of Applied Entomology125 ( 09.Oct ) , pp.583 - 587

Effects of novobiocin, nalidixic and oxolinic acids, which are potent antibacterial agents, on the survival and development of the hymenopterous endoparasitoid, Pimpla turionellae L. (Ichneumonidae) were investigated alone by rearing the larvae aseptically on chemically defined synthetic diets. Survival of the fifth instar larvae was not significantly affected by diets with different levels of antibiotics tested. A diet containing the lowest level of novobiocin significantly increased yields of pupae and adults. This level also significantly shortened the developmental time for fifth instar but had no significant effect on complete . . .development of the larvae up to adult emergence. Oxolinic acid at the lowest level did not affect the survival but prolonged development of the insect. In general, the rate of development was significantly increased and the survival was decreased with high levels of the antibiotics. However, nalidixic acid caused a striking decrease in the survival at all tested levels. These results suggest that novobiocin and to a lesser extent oxolinic acid are compatible for addition to artificial diet for rearing P. turionellae, which is an important parasitoid used in biological control Daha fazlası Daha az

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