نتایج جستجو برای: rigidity
تعداد نتایج: 30099 فیلتر نتایج به سال:
MOTIVATION HIV-1 protease is a key drug target due to its role in the life cycle of the HIV-1 virus. Rigidity analysis using the software First is a computationally inexpensive method for inferring functional information from protein crystal structures. We evaluate the rigidity of 206 high-resolution (2 Å or better) X-ray crystal structures of HIV-1 protease and compare the effects of different...
the present paper studies the possibility of propagation of torsional surface waves in an inhomogeneous anisotropic layer lying between two heterogeneous half-spaces (upper and lower half-space). both the half-spaces are assumed to be under compressive initial stress. the study reveals that under the assumed conditions, a torsional surface wave propagates in the medium. the dispersion relation ...
The origin of rigidity in disordered materials is an outstanding open problem in statistical physics. Previously, a class of 2D cellular models has been shown to undergo a rigidity transition controlled by a mechanical parameter that specifies cell shapes. Here, we generalize this model to 3D and find a rigidity transition that is similarly controlled by the preferred surface area: the model is...
Knowledge of the precise rigidity dependence of the helium flux is important in understanding the origin, acceleration, and propagation of cosmic rays. A precise measurement of the helium flux in primary cosmic rays with rigidity (momentum/charge) from 1.9 GV to 3 TV based on 50 million events is presented and compared to the proton flux. The detailed variation with rigidity of the helium flux ...
Recent increasing interest in surgery of the basal ganglia for tremor and rigidity in Parkinsonism would seem to warrant more critical measures for evaluating these symptoms, not only for the purpose of assessing surgical results but also to elucidate the underlying neurological mechanisms. Parkinsonian symptoms, especially rigidity and tremor, are frequently unstable and may vary with the pati...
The classical concept of rigidity characterises conditions under which distance constraints between agents in R enforce a rigid structure on the whole collection of agents. The present paper has two goals. Firstly, we propose a generalised theory for rigidity to allow heterogeneous agent states on non-Euclidean spaces and general non-linear relative state constraints. To do this, we characteris...
In this paper, we proved a rigidity theorem of the Hodge metric for concave horizontal slices and a local rigidity theorem for the monodromy representation.
OBJECTIVE Quantify the effect of a continuous compared to discontinuous movement trajectory on parkinsonian rigidity and reflex responses to passive stretch and shortening. METHODS Eighteen participants with Parkinson's disease (PD) performed passive wrist flexion and extension movements through a 90° range of motion at 50 °/sec using continuous (CONT) and discontinuous (DISC) movement trajec...
We study two properties of modules over an equicharacteristic or unramified local hypersurface R: decency and rigidity. We show that the vanishing of Hochster’s function θ(M,N), known to imply decent intersection, also implies rigidity. We investigate the vanishing of θ(M,N) to obtain new results about decency and rigidity over hypersurfaces. We employ a mixture of techniques from Commutative A...
A highly rigid Souslin tree T is constructed such that forcing with T turns T into a Kurepa tree. Club versions of previously known degrees of rigidity are introduced, as follows: for a rigidity property P , a tree T is said to have property P on clubs if for every club set C (containing 0), the restriction of T to levels in C has property P . The relationships between these rigidity properties...
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