نتایج جستجو برای: simple k_4
تعداد نتایج: 456991 فیلتر نتایج به سال:
ابزارهای مولکولی روشهای بسیار دقیق برای تنوع زیستی هستند. روش issr (inter-simple sequence repeats amplification ) روشی نسبتاً نوین برای بررسی گونه های نزدیک به هم می باشند. در ایران، جنس eremias پراکندگی وسیعی در زیستگاه ها متنوع از دشتی، ماسه ای و نیمه صحرایی دارند. همچنین این جنس تنوع گونه ای زیادی دارد بطوریکه تنها در ایران 16 گونه از آن معرفی شده است. به منظور بررسی روابط خویشاوندی بین گونه ...
We present a phase-coherent timing analysis of the intermittent accreting millisecond pulsar SAX J1748.9−2021. A new timing solution for the pulsar spin period and the Keplerian binary orbital parameters was achieved by phase connecting all episodes of intermittent pulsations visible during the 2001 outburst. We investigate the pulse profile shapes, their energy dependence and the possible infl...
Aims. We present the first long-term pulse profile study of the X-ray pulsar SAX J2103.5+4545. Our main goal is to study the pulse shape correlation either with luminosity, time or energy. Methods. This Be/X-ray binary system was observed from 1999 to 2004 by RXTE PCA, and by INTEGRAL from 2002 to 2005, during the Performance and Verification (PV) phase and the Galactic Plane Scan survey (GPS)....
We report on the BeppoSAX-WFC observation of a strong type-I X-ray burst from the recently discovered transient source SAX J1810.8-2609 (Ubertini et al., 1998a). The observed event showed evidence of photospheric radius expansion due to super-Eddington burst luminosity. Burst detection identifies the source as a probable low-mass X-ray binary harbouring a neutron star.
We present a simultaneous periodic and aperiodic timing study of the accreting millisecond X-ray pulsar SAX J1808.4-3658. We analyze five outbursts of the source and for the first time provide a full and systematic investigation of the enigmatic phenomenon of the 1 Hz flares observed during the final stages of some of the outbursts. We show that strong links between pulsations and 1 Hz flares e...
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