4,550 research outputs found
The Foundation of Early Intervention Trans-Disciplinary Team Model for Children with Developmental Disability in Nantou County
No full textEnhancement of nuclear magnetic resonance in microtesla magnetic field with prepolarization field detected with high-T-c superconducting quantum interference device
No full textEnhancement in low field nuclear magnetic resonance with a high-T-c superconducting quantum interference device and hyperpolarized He-3
No full text"Hong lou meng" yan jiu zi liao fen lei suo yin 1630-2009
No full text"Hong lou meng" yan jiu zi liao fen lei suo yin shi yi bu an lei shu li jian suo li dai "Hong lou meng"y an jiu zi liao pian mu di gong ju sh
Intramolecular Diels-Alder cycloadditions of fulvenes: Synthesis of the Kigelinol, Neoamphilectane and Kempanes skeletons
No full textPharmacological characterization of nociceptin/orphanin FQ receptors, a novel opioid receptor family, in the midbrain periaqueductal gray.
No full textThe Impact of Implementaton of clinical Pathway in One Hospital ---Application of Transurethral prostectomy in HTUH
No full textIntramolecular Diels-Alder cycloadditions of fulvenes. Application to the kigelinol, neoamphilectane, and kempane skeletons
No full textModel for single-particle dynamics in supercooled water RID F-2194-2011
No full textWe analyze a set of 10 M-step molecular dynamics (MD) data of low-temperature SPC/E model water with a phenomenological analytical model. The motivation is twofold: to extract various k-dependent physical parameters associated with the single-particle or the self-intermediate scattering functions (SISFs) of water at a deeply supercooled temperature and to apply this analytical model to analyse of new high resolution quasielastic neutron scattering data presented elsewhere. The SISF of the center of mass computed from the MD data show clearly time-separated two-step relaxations with a well defined plateau in between. We model the short time relaxation of the test particle as a particle trapped in a harmonical potential well with the vibrational frequency distribution function having a two-peak structure known from previous inelastic neutron scattering experiments. For the long time part of the relaxation, we take the alpha relaxation suggested by mode-coupling theory. The model fits the low-temperature SISK over the entire time range from 1 fs to 10 ns, allowing us to extract peak positions of the vibrational density of states, the structural relaxation rats 1/tau of the cage (the potential well) and the stretch exponent beta. The structural relaxation rate has a power law dependence on the magnitude of the wave vector transfer k and the stretch exponent varies from 0.55 at large k to unity at small k
SANS study of the structure and interaction of L64 triblock copolymer micellar solution in the critical region
No full textPluronic L64 triblock copolymer is soluble in water at room temperature up to more than 30 wt%, forming disordered spherical micellar phase above the cmc-cmt line. We investigate the structure and interaction between these micelles at temperature approaching the cloud point curve at approximate 57 degrees C along isoconcentration lines. An extensive light scattering intensity measurement indicates that the critical concentration is about 5wt%. We use a previously developed cap-and-gown model for calculating the micellar structure factor and a sticky hard sphere model for the intermicellar structure factor. SANS intensity distribution is fitted with four parameters: the aggregation number of micelle N, the hydrophobic core radius a, the overall hard sphere volume fraction phi, and the stickiness between micelles 1/tau. The model is found to describe all SANS data satisfactorily in absolute scale. As one approaches the cloud point curve at constant weight fraction, the aggregation number increases, the micellar core becomes dryer, and the stickiness parameter increases. In particular, at weight fraction of 5%, the stickiness parameter approaches the critical value 10.2 at T=330.9 K. We thus conclude that there is a critical demixing point in this micellar solution where micelles interact strongly with each other by a short range temperature dependent attraction
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