نتایج جستجو برای: gas mobility control
تعداد نتایج: 1637340 فیلتر نتایج به سال:
Ion mobility instruments that utilize nitrogen as buffer gas are often preceded by an ion trap and accumulation region that also uses nitrogen, and for different inert gases, no significant effects upon performance are expected for ion mobility spectrometry (IMS) of larger ions. However, we have observed significantly improved performance for an ion funnel trap upon adding helium; the signal in...
We derive and evaluate expressions for the frictional Coulomb drag between disordered two-dimensional electron gas layers. Our derivation is based on the memory-function formalism and the expression for the drag reduces to previously known results in the ballistic limit. We find that Coulomb drag is appreciably enhanced by disorder at low temperatures when the mean-free-path within a layer is c...
Introduction: One of the negative consequences of such a fear is a decline in the person's ability to perform daily life activities. The purpose of this study was to investigate the effect of mental practice on fear of falling in activity of daily living, satisfaction, functional mobility and balance in the community-dwelling elderly people. Materials and Methods: In this clinical trial study, ...
background: generalized joint hyper mobility predisposes some individuals to a wide variety of musculoskeletal complaints. given the critical role of scapular position in function of shoulder, the aim of this study was to compare scapular position between persons with and without general joint hyper mobility. methods: by nonprobability sampling 30 hyper mobile persons at average of 22.86 ±2.77 ...
In this paper we provide cross-layer analysis of the impact of mobility and Medium Access Control parameters in IEEE 802.11 wireless network on TCP. Performances of the Internet transport protocols may significantly degrade when end to end connection includes wireless links where packets delays and losses are caused by mobility and transmission errors. We perform analysis of the achievable thro...
Purpose: This quasi-experimental and applied research was conducted in 2019. The statistical population of this study included female patients with Multiple Sclerosis (MS) who were members of the Iranian MS Association. Methods: The study subjects were selected among those with a moderate level of disability (between grades 2 & 5). From the statistical population, initially, 60 individuals we...
Background & Objective: Hyper- kyphosis negatively affects health status, physical mobility, and quality of life. Corrective exercise interventions are often utilized to manage subjects with thoracic hyper-hypnosis. The purpose of this study was to investigate the effectiveness of multimodal spine strengthening exercises (spinal strengthening, spinal alignment and other such exercises for incr...
Ion mobility-mass spectrometry measurements which describe the gas-phase scaling of molecular size and mass are of both fundamental and pragmatic utility. Fundamentally, such measurements expand our understanding of intrinsic intramolecular folding forces in the absence of solvent. Practically, reproducible transport properties, such as gas-phase collision cross-section (CCS), are analytically ...
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