Fall and rise of the Black Sea ecosystem



Spectra, vacua, and the unitarity of Lovelock gravity in D-dimensional AdS spacetimes
Sisman, Tahsin Cagri; Gullu, Ibrahim; Tekin, Bayram (2012-08-24)
We explicitly confirm the expectation that generic Lovelock gravity in D dimensions has a unitary massless spin-2 excitation around any one of its constant curvature vacua just like the cosmological Einstein gravity. The propagator of the theory reduces to that of Einstein's gravity, but scattering amplitudes must be computed with an effective Newton's constant which we provide. Tree-level unitarity imposes a single constraint on the parameters of the theory yielding a wide range of unitary region. As an ex...
Leo satellites: attitude determination and control components; some linear attitude control techniques
Kaplan, Ceren; Kocaoğlan, Erol; Department of Electrical and Electronics Engineering (2006)
In this thesis, application of linear control methods to control the attitude of a Low-Earth Orbit satellite is studied. Attitude control subsystem is first introduced by explaining attitude determination and control components in detail. Satellite dynamic equations are derived and linearized for controller design. Linear controller and linear quadratic regulator are chosen as controllers for attitude control. The actuators used for control are reaction wheels and magnetic torquers. MATLAB-SIMULINK program ...
Performance comparison of brbfs designed using different response modification factors
Güner, Tuğberk; Topkaya, Cem; Department of Civil Engineering (2020-9)
In this study, buckling restrained braced frames (BRBFs) designed with various response modification factors were examined by numerical analysis and their performances were compared using the next-generation performance assessment approach. Three, six, and nine-story archetypes (low to medium-rise) with response modification factors in the range of 1 to 8 were designed using ASCE7-16, AISC 341-16, and AISC 360-16 specifications. A total of 24 archetypes were analyzed using nonlinear dynamic analysis procedu...
Numerical simulation of catastrophic tsunami propagation in the Indian Ocean (December 26, 2004)
Zaitsev, AI; Kurkin, AA; Levin, BV; Pelinovsky, EN; Yalçıner, Ahmet Cevdet; Troitskaya, YI; Ermakov, SA (2005-05-01)
Feeding, respiration and growth of ctenophore Beroe cf ovata in the low salinity conditions of the Caspian Sea
Kıdeyş, Ahmet Erkan; Anninsky, BE; Shiganova, TA; Roohi, A; Tabari, MR; Youseffan, M; Rostamiya, MT (2004-01-01)
The ctenophore Beroe cf ovata, which spontaneously entered the Black Sea in the 1990s and suppressed the previous ctenophoran invader Mnemiopsis leidyi by its predatory impact, is currently considered for intentional introduction to the Caspian Sea as well. In order to assess its impact on Mnemiopsis in the Caspian, Beroe was transported during 2002 from the Black Sea and the Bosporus to the Khazerabad laboratory (Mazandaran), on the Caspian coast of Iran, where experiments on its survival in Caspian water,...
Citation Formats
A. E. Kıdeyş, “Fall and rise of the Black Sea ecosystem,” SCIENCE, pp. 1482–1484, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31480.