Browsing by Subject "Metal"

Now showing 1 - 9 of 9

Restricted
1990’lı yıllarda Türkiye’de rock müzik kültürü ve Akmar Pasajı’nın rolü
(Bilkent University, 2021) Örnek, Mehmet Kaan; Baran, İmre; Demirayak, Tanya; Güner, Mustafa Ege; Esis, Sabahaddin Mert
Rock müzik, türevi olduğu Caz ve Blues müzik türlerine göre daha geç ortaya çıkmasına rağmen oldukça kısa sürede alt türlerini geliştiren, büyük kitlelere ulaşan bir müzik türüdür. 1950’li yıllarda ortaya çıkan Rock müzik, kısa sürede ABD’den diğer ülkelere ulaşmayı başarmıştır. 1960’lı yıllarda Türkiye’deki ilk eserlerinin görülebildiği Rock müzik türünün Türkiye’deki gelişiminin en bariz gözlenebildiği dönemlerden biri 1990’lı yıllardır. Bu çalışmada, 1990’lı yıllarda Türkiye’ye girişinden 30 yıl geçmiş olmasına rağmen hala gelişim ve değişim gösteren Rock müzik kültürü bahsi geçen yıllar özelinde incelenecektir. Aynı zamanda, 1990’lı yıllarda İstanbul’daki Rock müzik dinleyicilerinin bu müziği dinleyebildikleri, bu müzik üstünde konuşabildikleri ve bu müziği dinleyen insanlarla birlikte sosyalleşebildikleri bir mekân haline gelen Akmar Pasajı’nın Rock müzik kültürü üzerindeki etkisi de incelenecektir.
Open Access
Correlations in metal release profiles following sorption by Lemna minor
(Taylor and Francis Inc., 2016) Tunca, E. Ü.; Ölmez, T.T.; Özkan, A. D.; Altındağ, A.; Tunca, E.; Tekinay, T.
ABSTRACT: Following the rapid uptake of contaminants in the first few hours of exposure, plants typically attempt to cope with the toxic burden by releasing part of the sorbed material back into the environment. The present study investigates the general trends in the release profiles of different metal(loid)s in the aquatic macrophyte Lemna minor and details the correlations that exist between the release of metal(loid) species. Water samples with distinct contamination profiles were taken from Nilüfer River (Bursa, Turkey), Yeniçağa Lake (Bolu, Turkey), and Beyşehir Lake (Konya, Turkey) and used for release studies; 36 samples were tested in total. Accumulation and release profiles were monitored over five days for 11 metals and a metalloid (208Pb, 111Cd, 52Cr,53Cr,60Ni,63Cu,65Cu,75As,55Mn, 137Ba, 27Al, 57Fe, 66Zn,68Zn) and correlation, cluster and principal component analyses were employed to determine the factors that affect the release of these elements. Release profiles of the tested metal(loid)s were largely observed to be distinct; however, strong correlations have been observed between certain metal pairs (Cr/Ni, Cr/Cu, Zn/Ni) and principal component analysis was able to separate the metal(loid)s into three well-resolved groups based on their release.
Open Access
Interactions between metals accumulated in the narrow-clawed crayfish Astacus leptodactylus (Eschscholtz, 1823) in Dikilitaş Lake, Turkey
(Taylor and Francis Ltd., 2015) Ergen, Ş. F.; Tunca, E. Ü.; Ozkan A.D.; Ölmez, T. T.; Acaröz, E.; Altındağ, A.; Tekinay, T.; Tunca E.
The accumulations of Al, Cd, Cr, Cu, Fe, Ni, Pb and Zn in the exoskeleton, gills, hepatopancreas and abdominal muscles of crayfish Astacus leptodactylus (Eschscholtz, 1823) were determined. The strongest correlation observed was between Cr and Ni in the gills (r = 0.904); moderate to strong correlations between Al, Cr, Fe, Ni and Cu were also observed in gill tissue. Disregarding the gills, the strongest correlation was found between Cu and Zn in the hepatopancreas (r = 0.808); the correlation between these two metals might have been a result of metallothionein activity. The accumulation of Pb was found to correlate with that of Cd in the exoskeleton, Cd and Zn in the gills, Zn and Cu in the hepatopancreas and Cu in the abdominal muscle. None of these correlations were present in lakewater and sediment samples, suggesting that the crayfish metabolism may be responsible for the co-accumulation of metal–metal pairs. As all correlations in non-gill tissues are observed between divalent metals, a shared transporter such as divalent metal transporter 1 might be involved in the accumulation of these metals. © 2015 Taylor & Francis.
Restricted
İzmir'de karanlık bir gece
(Bilkent University, 2018) İnalcı, Aslınur; Akpınar, Naci; Gürler, Gürkan; Seyis, Ege; Demir, Çağatay
Bu araştırmada 1990 yılında İzmir’de Norveçli black metal grubu “Mayhem” ile Türk heavy metal gruplarından Hazy Hill’in verdiği konser incelendi. Konserin organize ediliş hikayesi, konserde yaşananlar ve konserin bıraktığı etkinin yanı sıra metal müziğin doğuşu, Mayhem ve Hazy Hill grupları ve bu türe katkıları, Türkiye’de metal müzik ve bu türe karşı oluşmuş önyargılar araştırıldı. Bu konser, o zamanda çok fazla dinleyici kitlesine hitap edememiş olsa da konser sırasında yaşanan bir takım problemlerden ve konserden hemen sonra Mayhem grubunun adının sansasyonel olaylarla anılmasından dolayı git gide ün kazandı ve günümüzde metal dinleyicileri tarafından efsaneleşmiş bir olay olarak anılmaya başladı.
Open Access
Josephson effect in superconductive SNS heterostructures with barriers
(The American Physical Society, 2003) Cakir, O.; Kulik, I. O.
The dc Josephson effect in a planar superconductor-normal-metal-superconductor (SNS) junction is studied in the existence of a δ barrier in the normal region. The Green function of the structure is obtained by solving the Gorkov equations for the structure and then the current is calculated from the Green functions. The effect of the strength and position of the barrier is investigated. The current shows a weak dependence on the position of the barrier and it is seen to be maximum when the barrier is at the middle of the normal region. Also it is found that the current shows a stronger dependence on the strength of the barrier at low temperatures. A comparative discussion of three possible types of Josephson junctions, the SIS, SCS, and SNS contacts, is presented.
Open Access
Metal nanoring and tube formation on carbon nanotubes
(American Physical Society, 2002) Bagci, V. M. K.; Gülseren, O.; Yildirim, T.; Gedik, Z.; Ciracil, S.
The structural and electronic properties of aluminum-covered single-wall carbon nanotubes (SWNT's) are studied from first principles for a large number of coverages. Aluminum-aluminum interaction, that is stronger than aluminum-tube interaction, prevents uniform metal coverage, and hence gives rise to the clustering. However, a stable aluminum ring and aluminum nanotube with well defined patterns can also form around the semiconducting SWNT's and lead to metallization. The persistent current in the Al nanoring is discussed to show that a high magnetic field can be induced at the center of SWNT.
Open Access
Photonic band gaps, defect characteristics, and waveguiding in two-dimensional disordered dielectric and metallic photonic crystals
(American Physical Society, 2001) Bayındır, Mehmet; Cubukcu, E.; Bulu, I.; Tut, T.; Özbay, Ekmel; Soukoulis, C. M.
We experimentally investigated the influence of positional disorder on the photonic band gap, defect characteristics, and waveguiding in two-dimensional dielectric and metallic photonic crystals. Transmission measurements performed on the dielectric photonic crystals have shown a stop band even if a large amount of disorder was introduced to these structures. On the other hand, the photonic band gap of the metallic crystals was found to be very sensitive to disorder, while the metallicity gap was not affected significantly. We addressed how the transmission characteristics of a cavity were affected in the presence of weak disorder. Since the translational symmetry was broken by disorders, we measured different cavity frequencies when we generated defects at various locations. We also demonstrated the propagation of photons by hopping through coupled-cavity structures in both dielectric and metallic two-dimensional photonic crystals. Effects of weak disorder on guiding and bending of electromagnetic waves through the coupled-cavity waveguides were also investigated.
Open Access
Point normal metal-superconductor (NS) contact in nonballistic regime
(World Scientific Publishing, 2003) Askerzade, İ. N.; Kulik, Igor Orestovich
We analyze the point NS contact conductivity taking into account the depression of superconductivity at high-injection current density and Andreev reflection at the adaptive NS boundary. The dependence of the excess current on the voltage, as well as conductivity of contact at arbitrary voltage is obtained.
Restricted
Yeraltından gelen gürültü: Ankara Ekstrem müzik tarihi
(Bilkent University, 2018) Koçakoğlu, Arda; Yıldırım, Alp; Turhan, Beste; Otuzoğlu, Janset; Deveci, Mert
Türkiye’de 80’li ve 90’lı yıllarda icra edilmiş Death Metal, Black Metal, Thrash Metal, Hardcore Punk ve Grindcore gibi ekstrem müzik türevleri gerek radikal temalarıyla, gerekse medyadaki yansımalarıyla Türkiye’nin sosyal tarihinde önemli bir yer edinmiştir. 80 Darbesi gibi siyasi olaylar sonucunda etkilenen Türkiye ekonomisinin getirdiği kısıtlı imkanlara ve medyanın manipülasyonlarına rağmen bu müzik kültürü Türkiye’de yayılmayı sürdürmüş, Türkiye ekstrem müzik tarihinin en ikonik ürünleri de bu dönemlerde ortaya çıkmıştır. Bu araştırmada Türkiye ve dünya ekstrem müzik tarihine dair belgelerden, yayınlardan, gazete makalelerinden ve araştırmanın kapsadığı dönemlerde aktif bir şekilde müzik icra eden müzisyenlerden alınan bilgilerden yararlanılarak ekstrem müziğin Türkiye toplumundaki yansımaları incelenmiş, aynı zamanda da dönemin sosyolojik bir portresi çizilmiştir.