122,354 research outputs found
Probing and extracting the structure of vibrating SF6 molecules with inner-shell photoelectrons
Full text linkCitation: Nguyen, N. T., Lucchese, R. R., Lin, C. D., & Le, A. T. (2016). Probing and extracting the structure of vibrating SF6 molecules with inner-shell photoelectrons. Physical Review A, 93(6), 9. doi:10.1103/PhysRevA.93.063419We propose a scheme for probing the structure of vibrating molecules with photoelectrons generated from ultrashort soft-x-ray pulses. As an example we analyze below-100-eV photoelectrons liberated from the S(2p) orbital of vibrating SF6 molecules to image very small structural changes of molecular vibration. In particular, photoionization cross sections and photoelectron angular distributions (PAD) at nonequilibrium geometries can be retrieved accurately with photoelectrons near the shape resonance at 13 eV. This is achieved with a pump-probe scheme, in which the symmetric stretch mode is first Raman excited predominantly by a relatively short laser pulse and then later probed at different time delays by a few-femtosecond soft-x-ray pulse with photon energy near 200 eV
Vascular endothelial growth factor restores delayed tumor progression in tumors depleted of macrophages
Full text linkGenetic depletion of macrophages in Polyoma Middle T oncoprotein (PyMT)-induced mammary tumors in mice delayed the angiogenic switch and the progression to malignancy. To determine whether vascular endothelial growth factor A (VEGF-A) produced by tumor-associated macrophages regulated the onset of the angiogenic switch, a genetic approach was used to restore expression of VEGF-A into tumors at the benign stages. This stimulated formation of a high-density vessel network and in macrophage-depleted mice, was followed by accelerated tumor progression. The expression of VEGF-A led to a massive infiltration into the tumor of leukocytes that were mostly macrophages. This study suggests that macrophage-produced VEGF regulates malignant progression through stimulating tumor angiogenesis, leukocytic infiltration and tumor cell invasion
Spiranthes nivea var. nivea T. P. Lin & W. M. Lin 2011
No full textSpiranthes nivea T.P. Lin & W.M. Lin (2011: 320) var. nivea — Fig. 4. Type:— TAIWAN. Pingtung: Tahanshan, 20 May 2009, Y.F. Wang s.n. (holotype: TAI 270634!). Synonym:— Spiranthes suishaensis auct. non (Hayata 1916: 86) Schlechter (1919: 161): Lin (2016: 117). Morphological descriptions and illustrations: —See Lin & Lin (2011: 320; f. 5), Surveswaran et al. (2017: 125; f. 4), Hsu & Chung (2016: 188), as Spiranthes suishaensis, and Lin (2019: 266; f. 117; pl. 13). Distribution and ecology: —The typical variety species is only recorded from the type locality, Tahanshan (Mt. Tahan) in southern Taiwan. It grows on semi-open roadside slopes around 1400–1600 m elev. and flowers from March to April. Additional specimens examined: — TAIWAN. Pingtung Co.: Mt. Tahan, 13 March 2013, T.-C. Hsu 6342 (TAIF!); Tahanshan, 9 April 2013, S.-S. Lin s.n. (TAI!). Taxonomic remarks: — Spiranthes nivea is most similar to S. hongkongensis, but it differs in having nearly glabrous labellum disc, smaller glabrous basal labellum callosities, and sparsely pubescent glabrous rachis, ovaries, and sepals.Published as part of Suetsugu, Kenji & Hsu, Tian-Chuan, 2023, Taxonomic revision of the genus Spiranthes (Orchidaceae) in Taiwan, pp. 1-10 in Phytotaxa 578 (1) on page 5, DOI: 10.11646/phytotaxa.578.1.1, http://zenodo.org/record/751762
Effects of adding nano metal powers on thermooxidative degradation of poly(Ethylene Glycol).
No full textZ. Lin, X. Han, T. Wang and S. L
Measurement of the top-quark mass in all-jets events in pp collisions at = 7 TeV
Full text linkThe mass of the top quark is measured using a sample of candidate events with at least six jets in the final state. The sample is selected from data collected with the CMS detector in pp collisions at = 7 TeV in 2011 and corresponds to an integrated luminosity of 3.54 . The mass is reconstructed for each event employing a kinematic fit of the jets to a hypothesis. The top-quark mass is measured to be 173.49 0.69(stat.) 1.21(syst.) GeV. A combination with previously published measurements in other decay modes by CMS yields a mass of 173.54 0.33(stat.) 0.96(syst.) GeV
SPATIAL CHOW-LIN METHODS: BAYESIAN AND ML FORECAST COMPARISONS
Full text linkCompleting data that are collected in disaggregated and heterogeneous spatial units is a quite frequent problem in spatial analyses of regional data. Chow and Lin (1971) (CL) were the rst to develop a uni ed framework for the three problems (interpolation, extrapolation and distribution) of predicting disaggregated times series by so-called indicator series. This paper develops a spatial CL procedure for disaggregating cross-sectional spatial data and compares the Maximum Likelihood and Bayesian spatial CL forecasts with the naive pro rata error distribution. We outline the error covariance structure in a spatial context, derive the BLUE for the ML estimator and the Bayesian estimation procedure by MCMC. Finally we
apply the procedure to European regional GDP data and discuss the disaggregation assumptions. For the evaluation of the spatial Chow-Lin procedure we assume that only NUTS 1 GDP is known and predict it at NUTS 2 by using employment and spatial information available at NUTS 2. The spatial neighborhood is de ned by the inverse travel time by car in minutes. Finally, we present the forecast accuracy criteria comparing the predicted values with the actual observations.
Exciton dissociation and migration in enhanced order polymer/nanocrystal hybrid composite materials
No full textAcoustic radiation due to scattering of T-S wave by the mean-flow distortion induced by steady local suction
No full textSubstantial sound waves can be generated by boundary-layer instability modes when the latter are scattered by a rapid mean-flow distortion. This is a rather generic mechanism and operates when an oncoming T-S wave is scattered by a steady local suction slot. This paper focuses on this problem by extending a recently developed Local Scattering Theory (Wu & Dong, J. Fluid Mech. submitted), where a so-called transmission coefficient, defined as the ratio of the T-S wave amplitude downstream of the scatter to that upstream, is introduced to characterize the effect of a local scatter on boundary-layer instability and transition. As in the earlier work, the mathematical formulation is based on triple-deck formulism, but in order to accommodate the acoustic far field, which was not considered in the paper mentioned, the unsteady terms in the upper deck, which play a leading-order role in radiation, are retained, and the influence of the radiated sound on the near-wall perturbation is included. The upper deck equation for the pressure is the Helmholtz equation rather than the Laplace equation. This leads to a modified pressure-displacement relation, which is coupled with the linearized boundary-layer equations in the lower deck. Discretization of the whole system formulates a generalized eigenvalue problem, which is solved numerically. It is found that suction suppresses oncoming T-S waves, and this effect increases with the suction velocity and the slot width. The directivity is ndependent of the flow parameters only when the Mach number is low. The intensity of the radiated sound in general increases with the frequency, the suction velocity and the width of the suction slot. Interestingly, for O(1) suction velocities, the radiated sound is very weak, indicating that the gain of stabilizing effect does not cause aeroacoustic penalty
Fully Integrated Concurrent Dual-Band Low Noise Amplifier with Suspended Inductors in SiGe 0.35 μm BiCMOS Technology
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