830 research outputs found
CANONICAL ABERRATION THEORY IN ELECTROMAGNETIC MULTIPOLES
No full textIn a 2N-pole electromagnetic system, defining the electron optical Hamiltonian function, we have derived both general algebraic expressions (arbitrary N) and special numerical formulas (N = 3,4,5,6,7) for different aberrations from lower to higher order (i.e., the order of N - 1, N + 1, 2N - 3, 2N - 1, 3N - 5). The so-called canonical aberration theory in electromagnetic multipoles has thus been developed, which allows us to deduce angular dependencies of different aberrations and to examine the possibility for spherical correction of a round lens by using multipoles.Physics, AppliedSCI(E)0ARTICLE125968-59756
Fiber Optic Coupling of CW Linear Laser Diode Array
No full textBased on a set of microoptics the output radiation from a continuous wave (CW) linear laser diode array is coupled into a multi-mode optical fiber of 400 ptm diameter. The CW linear laser diode array is a 1 cm laser diode bar with 19 stripes with 100 fxm aperture spaced on 500 (xm centers. The coupling system contains packaged laser diode bar, fast axis collimator, slow axis collimation array, beam transformation system and focusing system. The high brightness, high power density and single fiber output of a laser diode bar is achieved. The coupling efficiency is 65% and the power density is up to 1.03 * 10~4 W/cm~2
Tunable visual color filter using microfluidic grating
No full textAuthor name used in this publication: X. M. Zhang2010-2011 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedVoR allowe
半乳糖凝集素-3基因在口腔鳞状细胞癌增殖、侵袭、凋亡中的作用及机制研究
No full textObjective The effect and mechanism of Galectin-3 gene expression on proliferation, invasion, and apoptosis of oral squamous cell carcinoma (OSCC) were investigated. Methods Reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting were used to detect the mRNA and protein of Galectin-3 gene in OSCC. OSCC Tca8113 was divided into control, negative control, and Galectin-3 transfection groups. Western blotting was used to detect the expression of Galectin-3, matrix metalloproteinase (MMP)-2, MMP-9, Cleaved Caspase-3, β-catenin, and Cyclin D1 protein after transfection for 48 h in each group. Cell proliferation was detected by CCK8. Cell invasion ability was detected by using a Transwell chamber. Cell apoptosis was detected by flow cytometry. Results The mRNA and protein expression levels of Galectin-3 gene in OSCC were significantly higher than those in adjacent tissues (P<0.01). Galectin-3 protein expression in Tca8113 cells significantly decreased after RNA interference. Cell survival rate and invasion as well as MMP-2, MMP-9, β-catenin, and Cyclin D1 protein expression were significantly lower than the blank group. Apoptosis rate and Cleaved Caspase-3 protein expression were sig-nificantly higher than the control group (P<0.01). Conclusion Inhibition of Galectin-3 gene expression in OSCC can signi-ficantly reduce the proliferation and invasion of cancer cells and induce apoptosis. The mechanism is related to downregulation of the Wnt/β-catenin signaling pathway.Full Tex
Bivariate Tensor-Product B-Splines in a Partly Linear Model
No full textAbstractIn some applications, the mean or median response is linearly related to some variables but the relation to additional variables are not easily parameterized. Partly linear models arise naturally in such circumstances. Suppose that a random sample {(Ti, Xi, Yi),i=1, 2, …, n} is modeled byYi=XTiβ0+g0(Ti)+errori, whereYiis a real-valued response,Xi∈RpandTiranges over a unit square, andg0is an unknown function with a certain degree of smoothness. We make use of bivariate tensor-product B-splines as an approximation of the functiong0and consider M-type regression splines by minimization of ∑ni=1ρ(Yi−XTiβ−gn(Ti)) for some convex functionρ. Mean, median and quantile regressions are included in this class. We show under appropriate conditions that the parameter estimate ofβachieves its information bound asymptotically and the function estimate ofg0attains the optimal rate of convergence in mean squared error. Our asymptotic results generalize directly to higher dimensions (for the variableT) provided that the functiong0is sufficiently smooth. Such smoothness conditions have often been assumed in the literature, but they impose practical limitations for the application of multivariate tensor product splines in function estimation. We also discuss the implementation of B-spline approximations based on commonly used knot selection criteria together with a simulation study of both mean and median regressions of partly linear models
Dendrolycopodium verticale comb. nov (Lycopodiopsida: Lycopodiaceae) from China
No full textA new combination in the lycophyte genus Dendrolycopodium (Lycopodiacae) from Lycopodium, D. verticale (Li Bing Zhang) Li Bing Zhang & X. M. Zhou, for a Chinese species is made
Glycochenodeoxycholate-Induced Apoptosis Is Not Reduced by Augmenter of Liver Regeneration in the Human Hepatoma Cell Line HuH-7
No full textTheoretical interpretation on ion heating experiments in reverse field pinch devices
No full textA new set of equations for the energies of the mean magnetic field and the mean plasma velocity is derived taking the dynamo effects into account, by which the anomalous phenomenon, T(i) > T(e), observed in some reversed field pinches (RFP's) is successfully explained
Interference effect on friction behavior of asperities on single crystal copper
No full textBy using Green function molecular dynamics method, we systematically study the friction behavior of a single asperity and asperity array over the (1 1 1) surface of single crystal copper. We find that internal plastic behavior (burst of stacking faults, dislocation emission and propagation) is a promising reason for the higher value of static friction coefficient than that of dynamics friction in non-adhesive scratch. For the rough surface, however, the difference between static and dynamic friction coefficients disappear due to the interference between asperities. The interference dramatically increases the friction coefficient by introducing atomic scale plastic features (pile-up atoms, stacking faults, and U-shape dislocation loop). (C) 2014 Elsevier Ltd. All rights reserved
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