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51.
S. González de la Hoz L. March E. Ros J. Sánchez G. Amorós F. Fassi A. Fernández M. Kaci A. Lamas J. Salt 《The European Physical Journal C - Particles and Fields》2008,54(4):691-697
In the ATLAS computing model the tiered hierarchy ranged from the Tier-0 (CERN) down to desktops or workstations (Tier-3).
The focus on defining the roles of each tiered component has evolved with the initial emphasis on the Tier-0 and Tier-1 definition
and roles. The various LHC (Large Hadron Collider) projects, including ATLAS, then evolved the tiered hierarchy to include
Tier-2’s (Regional centers) as part of their projects. Tier-3 centres, on the other hand, have been defined as whatever an
institution could construct to support their Physics goals using institutional and otherwise leveraged resources and therefore
have not been considered to be part of the official ATLAS computing resources. However, Tier-3 centres are going to exist
and will have implications on how the computing model should support ATLAS physicists. Tier-3 users will want to access LHC
data and simulations and will want to enable their resources to support their analysis and simulation work. This document
will define how IFIC (Instituto de Física Corpuscular de Valencia), after discussing with the ATLAS Tier-3 task force, should
interact with the ATLAS computing model, detail the conditions under which Tier-3 centres can expect some level of support
and set reasonable expectations for the scope and support of ATLAS Tier-3 sites. 相似文献
52.
Adams CJ Crawford PC Orpen AG Podesta TJ Salt B 《Chemical communications (Cambridge, England)》2005,(19):2457-2458
Thermal dehydrochlorination of crystalline 4-picolinium salts of [PtCl4]2- and [PdCl4]2- leads to formation of trans-[MCl2(4-picoline)2](M = Pt, Pd). 相似文献
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55.
Christensen NB McMorrow DF Rønnow HM Lake B Hayden SM Aeppli G Perring TG Mangkorntong M Nohara M Takagi H 《Physical review letters》2004,93(14):147002
High-resolution neutron scattering experiments on optimally doped La2-xSrxCuO4 (x=0.16) reveal that the magnetic excitations are dispersive. The dispersion is the same as in YBa2Cu3O6.85, and is quantitatively related to that observed with charge sensitive probes. The associated velocity in La2-xSrxCuO4 is only weakly dependent on doping with a value close to the spin-wave velocity of the insulating (x=0) parent compound. In contrast with the insulator, the excitations broaden rapidly with increasing energy, forming a continuum at higher energy and bear a remarkable resemblance to multiparticle excitations observed in 1D S=1/2 antiferromagnets. The magnetic correlations are 2D, and so rule out the simplest scenarios where the copper oxide planes are subdivided into weakly interacting 1D magnets. 相似文献
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This paper addresses an easy computation of the multiple components of the response to a sinusoidal input of a dual-rate linear time-invariant discrete system from the Bode diagram of LTI systems arising from a lifted representation. Based on those results, a generalized Bode diagram is suggested. Some new conclusions derived from this conceptual interpretation are introduced. This diagram provides a better insight in the frequency-response issues in multivariable control than the standard singular value decomposition of the lifted model. As an application, the output ripple suppression in a multirate control scheme is presented. 相似文献
58.
H. Salt 《Transport in Porous Media》1988,3(4):325-341
The ‘power integral method’ of calculating heat transfer across a convecting porous layer is extended to flux and porous boundaries.
Convection starts at lower Rayleigh numbers for constant flux than for isothermal impervious boundaries and the flux is much
greater. At higher Rayleigh numbers, as more of the higher modes contribute to the flux, the type of boundary has less influence
on the heat transfer across the layer. For constant flux boundaries, simplified equations are developed to determine critical
values for the second and higher modes and these values can be related simply to those for isothermal impervious boundaries. 相似文献
59.
The applicability of the semidestructive holedrilling technique to the experimental determination of residual stresses in relatively thin rectangularly orthotropic materials was investigated. From the exploratory work, it was determined that the similitudes, for measurements at a particular ratio of hole depth to diameter, which exist for thick materials are not present in relatively thin materials. This implies that calibration tests must be made for each combination of strain-gage size and plate thickness. As a consolation, however, it was found that there is no need to drill to an optimum depth for thin materials. That is, one may simply drill a small hole completely through the material to obtain the desired strain change. 相似文献
60.
Sanchari Bhattacharya Tzu-Chiao Chao Nethmi Ariyasinghe Yvette Ruiz Douglas Lake Robert Ros Alexandra Ros 《Analytical and bioanalytical chemistry》2014,406(7):1855-1865
The trapping or immobilization of individual cells at specific locations in microfluidic platforms is essential for single cell studies, especially those requiring cell stimulation and downstream analysis of cellular content. Selectivity for individual cell types is required when mixtures of cells are analyzed in heterogeneous and complex matrices, such as the selection of metastatic cells within blood samples. Here, we demonstrate a microfluidic device based on direct current (DC) insulator-based dielectrophoresis (iDEP) for selective trapping of single MCF-7 breast cancer cells from mixtures with both mammalian peripheral blood mononuclear cells (PBMC) as well MDA-MB-231 as a second breast cancer cell type. The microfluidic device has a teardrop iDEP design optimized for the selective capture of single cells based on their differential DEP behavior under DC conditions. Numerical simulations adapted to experimental device geometries and buffer conditions predicted the trapping condition in which the dielectrophoretic force overcomes electrokinetic forces for MCF-7 cells, whereas PBMCs were not trapped. Experimentally, selective trapping of viable MCF-7 cells in mixtures with PBMCs was demonstrated in good agreement with simulations. A similar approach was also executed to demonstrate the selective trapping of MCF-7 cells in a mixture with MDA-MB-231 cells, indicating the selectivity of the device for weakly invasive and highly invasive breast cancer cells. The DEP studies were complemented with cell viability tests indicating acceptable cell viability over the course of an iDEP trapping experiment. Figure
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