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Browsing by Subject "High energy physics"

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    Dimensional crossover in two-dimensional Bose-Fermi mixtures
    (Institute of Physics Publishing, 2010) Subaşi, A. L.; Sevinçli, S.; Vignolo, P.; Tanatar, Bilal
    We investigate the equilibrium properties of boson-fermion mixtures consisting of a Bose condensate and spin-polarized Fermi gas confined in a harmonic two-dimensional (2D) trap using mean-field theory. Boson-boson and boson-fermion coupling constants have a logarithmic dependence on the density because of the two-dimensional scattering events when the s-wave scattering lengths are on the order of mixture thickness. We show that this modifies the density profiles significantly. It is also shown that the dimensional crossover stabilizes the mixture against collapse and spatial demixing is observed for the case of a negative boson-fermion scattering length.
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    High-energy femtosecond photonic crystal fiber laser
    (2010) Lecaplain, C.; Ortaç, B.; MacHinet G.; Boullet J.; Baumgart, M.; Schreiber, T.; Cormier, E.; Hideur, A.
    We report the generation of high-energy high-peak power pulses in an all-normal dispersion fiber laser featuring large-mode-area photonic crystal fibers. The self-starting chirped-pulse fiber oscillator delivers 11 W of average power at 15:5 MHz repetition rate, resulting in 710 nJ of pulse energy. The output pulses are dechirped outside the cavity from 7 ps to nearly transform-limited duration of 300 fs, leading to pulse peak powers as high as 1:9 MW. Numerical simulations reveal that pulse shaping is dominated by the amplitude modulation and spectral filtering provided by a resonant semiconductor saturable absorber. © 2010 Optical Society of America.
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    Türkiye’nin Marie Curie’si: Engin Arık
    (Bilkent University, 2023) Bilgi, İrem Fatmagül; Keleş, Sude Nur; Tarım, Duru; Ataman, Baturhan; Aydoğan, Sarp
    Engin Arık 14 Ekim 1948 yılında İstanbul'da doğdu. 1965 yılında Atatürk Kız Lisesinden mezun oldu. 1969 yılında ise İstanbul Üniversitesinden fizik ve matematik diploması alarak mezun oldu. Yüksek lisans için Pittsburgh Üniversitesine gitti ve orada kurumsal fizik alanına yoğunlaştı. 1979 da Boğaziçi üniversitesi bünyesine katıldı ve "Deneysel Yüksek Enerji Fiziği" alanında çalışmalar yaptı. 1990'lı yıllarda CERN'de çalışmaya başladı. CHARM II, CHORUS VE SMC deneylerinde çalıştı. ATLAS ve CAST deneylerinin Türk grup liderliklerini yaptı. katıldığı deneyler ve özellikle Toryum özelindeki çalışmalarıyla öne çıkan bir bilim insanı olmuştur. Bu nedenle de bu yazı Engin Arık'ın hayatı ve çalışmalarını anlatmak amacıyla yazıldı.

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