نتایج جستجو برای: collapse structure

تعداد نتایج: 1597376  

Journal: :Physical review letters 2006
Christian D Ott Adam Burrows Luc Dessart Eli Livne

We present a new theory for the gravitational-wave signatures of core-collapse supernovae. Previous studies identified axisymmetric rotating core collapse, core bounce, postbounce convection, and anisotropic neutrino emission as the primary processes and phases for the radiation of gravitational waves. Our results, which are based on axisymmetric Newtonian supernova simulations, indicate that t...

Journal: :Proceedings. Biological sciences 2014
Serena A Caplins Kimberly J Gilbert Claudia Ciotir Jens Roland Stephen F Matter Nusha Keyghobadi

Both landscape structure and population size fluctuations influence population genetics. While independent effects of these factors on genetic patterns and processes are well studied, a key challenge is to understand their interaction, as populations are simultaneously exposed to habitat fragmentation and climatic changes that increase variability in population size. In a population network of ...

The Nano-CrY zeolite synthesized and characterized by Fourier transfer infrared (FT-IR), X-ray diffraction (XRD),and Scanning electron microscopy (SEM).The result show that nano catalyst prepared with mainly particles size about 30-80 nm .The XRD show the structure of the zeolite does not collapse. This Nano-CrY zeolite has been used as new, and nontoxic catalyst for catalyzes of synthesis of 2...

2013
Babak Haghpanah Jim Papadopoulos Ashkan Vaziri

We present a numerical minimization procedure to determine the macroscopic ‘plastic collapse strength’ of a tessellated cellular structure under a general stress state. The method is illustrated with sample cellular structures of regular and hierarchical honeycombs. Based on the deformation modes found by minimization of plastic dissipation, closed-form expressions for strength are derived. The...

Journal: :International journal of clinical and experimental pathology 2012
Guanglu Yang Xiang Qu Junmei Zhang Weidong Zhao Hua Wang

Hippocampal nerve growth is regulated by the coordinated action of numerous external stimuli, including positively acting neurotrophin-derived growth cues and restrictive semaphorin cues, however the underlying cellular mechanisms remain largely unclear. We examined the potential cellular mechanism of Semaphorin3F (Sema3F) in cultured primary hippocampal neurons. We show that Sema3F can down-re...

2010
M. Bologna J. C. Flores

In this paper we consider a mathematical model for the evolution and collapse of the Easter Island society, starting from the fifth century until the last period of the society collapse (fifteen century). Based on historical reports, the available primary sources consisted almost exclusively on the trees. We describe the inhabitants and the resources as an isolated system and both considered as...

Journal: :CoRR 1997
Edith Hemaspaandra Lane A. Hemaspaandra Harald Hempel

Downward translation of equality refers to cases where a collapse of some pair of complexity classes would induce a collapse of some other pair of complexity classes that (a priori) one expects are smaller. Recently, the first downward translation of equality was obtained that applied to the polynomial hierarchy—in particular, to bounded access to its levels [HHH97]. In this paper, we provide a...

2008
Neil A. Butcher Paul M. Saffin

We simulate the gravitational dynamics of the conifold geometries (resolved and deformed) involved in the description of certain compact spacetimes. As the cycles of the conifold collapse towards a singular geometry we find that a horizon develops, shielding the external spacetime from the curvature singularity of the newly formed black hole. The structure of the black hole is examined for a ra...

2015

The advantage of GaN power devices in terms of performance is no longer hype but a reality that has empowered many power supply designers to build new applications that are more efficient, compact and able to operate in harsher environmental conditions. With a projected market size of U.S. $600 million in 2020 and a CAGR of 80% to 2020, many new players have entered the field and are introducin...

Journal: :Physical review letters 2010
M Vedadi A Choubey K Nomura R K Kalia A Nakano P Vashishta A C T van Duin

Shock-induced collapse of nanobubbles in water is investigated with molecular dynamics simulations based on a reactive force field. We observe a focused jet at the onset of bubble shrinkage and a secondary shock wave upon bubble collapse. The jet length scales linearly with the nanobubble radius, as observed in experiments on micron-to-millimeter size bubbles. Shock induces dramatic structural ...

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