نتایج جستجو برای: 2 proto

تعداد نتایج: 2546199  

2009
Marco Wischnewski Jochen J. Steil Lothar Kehrer Werner X. Schneider

We implement a novel computational framework for attention that includes recent experimentally derived assumptions on attention which are not covered by standard computational models. To this end, we combine inhomogeneous visual processing, proto-object formation, and parts of TVA (Theory of Visual Attention [2]), a well established computational theory in experimental psychology, which explain...

2003
Carl H. Gibson

The first structures were proto-voids formed in the primordial plasma. Viscous and weak turbulence forces balanced gravitational forces when the scale of causal connection LH ≡ ct ≈ LSV ≡ (γν/ρG) 1/2 ≈ LST ≡ ε /(ρG) at time t ≈ 30,000 years (10 s), with c the speed of light, γ ≈ 1/t the rate of strain, and ν the kinematic viscosity, where LSV and LST are viscous and turbulent Schwarz scales of ...

Journal: :The planetary science journal 2021

In the canonical model of Moon formation, a Mars-sized protoplanet "Theia" collides with proto-Earth at close to their mutual escape velocity $v_{\rm esc}$ and common impact angle 45{\deg}. The "graze-and-merge" collision strands fraction Theia's mantle into orbit, while Earth accretes most Theia its momentum. Simulations show that this produces hot, high angular momentum, silicate-dominated pr...

2017
Steven Brown

Proto-acting is introduced here as a new concept that refers to a set of processes that are intermediate between everyday role playing (in the Erving Goffman sense) and dramatic acting. Its most characteristic process is the voluntary act of personal mimicry, which can occur in everyday contexts, such as quoting someone during conversation, or in performance contexts, such as impressionism. Pro...

2011
Miri Krupkin Donna Matzov Hua Tang Markus Metz Rinat Kalaora Matthew J. Belousoff Ella Zimmerman Anat Bashan Ada Yonath

Based on the presumed capability of a prebiotic pocket-like entity to accommodate substrates whose stereochemistry enables the creation of chemical bonds, it is suggested that a universal symmetrical region identified within all contemporary ribosomes originated from an entity that we term the 'proto-ribosome'. This 'proto-ribosome' could have evolved from an earlier machine that was capable of...

Journal: : 2022

Ever since the Afroasiatic affiliation of Chadic as a whole was suggested by Joseph H. Greenberg in his seminal re-classification African languages 1950s and has been generally accepted, i.e. encompassing both ‘Chado-Hamitic’ ‘Chadic’ influential pre-Greenbergian genetic classifications, issue whether Proto-Chadic possessed prenasalised obstruents velar nasals repeatedly raised debated literatu...

Journal: :International journal of oral and dental health 2023

Increased expression of Bcl-2 protein has been demonstrated in various cancerous and precancerous lesions. The B-cell lymphoma-2 gene is a proto-oncogene that inhibits apoptosis, therefore keeping the cell alive. Mutations leads to an overexpression products leading apoptosis impairment resulting neoplastic changes as consequence. Hence, objective study was investigate fibro epithelial polyp (F...

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