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Search Results: 1 - 10 of 43512 matches for " Bo Hu "
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Reconstruction of Video Electromagnetic Leakage from Computer
Bo Hu
Modern Applied Science , 2009, DOI: 10.5539/mas.v1n2p56
Abstract: TEMPEST technology has been concerned much more in recent years. Video Displayer Unit, which is one of the most import parts that may result in computer information leakage, offers the interface for man-machine conversation directly and its video electromagnetic radiation contains the displaying information. The interception and recovery system of video electromagnetic information leakage of the computer is designed. After the electromagnetic leakage is intercepted, the method to recover the word image is presented using the reconstruction techniques such as synchronization, related filtering, phase lock on etc. This means that the original useful information can be reconstructed by the electromagnetic leakage under certain conditions, and this will menace information security. It is one of the most important factors that should be concerned in information security and electronic antagonism fields.
Effect of Activation of the Ca2+-Permeable Acid-Sensing Ion Channel 1a on Acid-Induced Vascular Endothelial Cell Injury of Henoch-Sch?nlein Purpura Children  [PDF]
Qidi Peng, Liping Yuan, Yan Bo, Xiaoyan Guo, Hu Bo
Open Journal of Pediatrics (OJPed) , 2016, DOI: 10.4236/ojped.2016.64044
Abstract: Acidosis in local environment plays a critical role in cell injury. One key mediator of acidosis-induced cell injury is the acid-sensing ion channels (ASICs), particularly ASIC1a. Herein, we investigated the role of ASIC1a in acid-induced vascular endothelial cell injury of Henoch-Schonlein purpura (HSP) children. Acid-induced ASIC1a, Calpain and Calcineurin expression in vascular endothelial cells pretreated with IgA1 isolated from HSP were detected by real time quantitative polymerase chain reaction and western blot methods, respectively. Cell cytotoxicity was measured by interleukin-8 and nitric oxide production with ELISA. The results showed acid-induced ASIC1a, Calpain and Calcineurin expression in cells increased, especially at PH6.5. The cytotoxicity of vascular endothelial cells was increased by extracellular acidosis. Moreover non-specific or specific blockers of ASIC1a, Amiloride and PcTX-1 could remarkably decrease these parameters. These findings show that increased [Ca2+]i, mediated via ASIC1a, might contribute to acid-induced vascular endothelial cell injury of HSP.
Behaviors and Strategies of Bacterial Navigation in Chemical and Nonchemical Gradients
Bo Hu,Yuhai Tu
PLOS Computational Biology , 2014, DOI: doi/10.1371/journal.pcbi.1003672
Abstract: Navigation of cells to the optimal environmental condition is critical for their survival and growth. Escherichia coli cells, for example, can detect various chemicals and move up or down those chemical gradients (i.e., chemotaxis). Using the same signaling machinery, they can also sense other external factors such as pH and temperature and navigate from both sides toward some intermediate levels of those stimuli. This mode of precision sensing is more sophisticated than the (unidirectional) chemotaxis strategy and requires distinctive molecular mechanisms to encode and track the preferred external conditions. To systematically study these different bacterial taxis behaviors, we develop a continuum model that incorporates microscopic signaling events in single cells into macroscopic population dynamics. A simple theoretical result is obtained for the steady state cell distribution in general. In particular, we find the cell distribution is controlled by the intracellular sensory dynamics as well as the dependence of the cells' speed on external factors. The model is verified by available experimental data in various taxis behaviors (including bacterial chemotaxis, pH taxis, and thermotaxis), and it also leads to predictions that can be tested by future experiments. Our analysis help reveal the key conditions/mechanisms for bacterial precision-sensing behaviors and directly connects the cellular taxis performances with the underlying molecular parameters. It provides a unified framework to study bacterial navigation in complex environments with chemical and non-chemical stimuli.
Few-Body States in Lund String Fragmentation Model
Bo Andersson,Haiming Hu
Physics , 1999,
Abstract: The well-known Monte Carlo simulation packet JETSET is not built in order to describe few-body states (in particular at the few GeV level in e^+e^- annihilation as in BEPC). In this note we will develop the formalism to use the basic Lund Model area law directly for Monte Carlo simulations
Interacting dark energy, holographic principle and coincidence problem
Bo Hu,Yi Ling
Physics , 2006, DOI: 10.1103/PhysRevD.73.123510
Abstract: The interacting and holographic dark energy models involve two important quantities. One is the characteristic size of the holographic bound and the other is the coupling term of the interaction between dark energy and dark matter. Rather than fixing either of them, we present a detailed study of theoretical relationships among these quantities and cosmological parameters as well as observational constraints in a very general formalism. In particular, we argue that the ratio of dark matter to dark energy density depends on the choice of these two quantities, thus providing a mechanism to change the evolution history of the ratio from that in standard cosmology such that the coincidence problem may be solved. We investigate this problem in detail and construct explicit models to demonstrate that it may be alleviated provided that the interacting term and the characteristic size of holographic bound are appropriately specified. Furthermore, these models are well fitted with the current observation at least in the low red-shift region.
The linear sampling method for the inverse electromagnetic scattering by a partially coated bi-periodic structure
Guanghui Hu,Bo Zhang
Mathematics , 2010, DOI: 10.1002/mma.1375
Abstract: In this paper, we consider the inverse problem of recovering a doubly periodic Lipschitz structure through the measurement of the scattered field above the structure produced by point sources lying above the structure. The medium above the structure is assumed to be homogenous and lossless with a positive dielectric coefficient. Below the structure is a perfect conductor partially coated with a dielectric. A periodic version of the linear sampling method is developed to reconstruct the doubly periodic structure using the near field data. In this case, the far field equation defined on the unit ball of R^3 is replaced by the near field equation which is a linear integral equation of the first kind defined on a plane above the periodic surface.
22°晕的光强度和颜色分布
胡波 Hu Bo
大气科学 , 1995, DOI: 10.3878/j.issn.1006-9895.1995.06.11
Abstract: 本文首次提出了22°晕的折射—衍射理论,计算了几种冰晶大小平均值ā和标准差σ情况下22°晕的径向光强度分布和色品坐标,给出了相对光强度曲线和色品曲线。探讨了冰晶大小及其分布对22°晕光强度和颜色分布的影响。理论计算的22°晕光强度分布与实测结果基本相符。事实上,22°晕是一种折射—衍射晕。
Gaussian Convolution Filter and its Application to Tracking  [PDF]
Qing LIN, Jianjun YIN, Jianqiu ZHANG, Bo HU
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.12014
Abstract: A new recursive algorithm, called the Gaussian convolution filter (GCF), is proposed for nonlinear dynamic state space models. Based on the convolution filter (CF) and similar to the Gaussian filters, the GCF ap-proximates the posterior density of the states by Gaussian distribution. The analytical results show the ability to deal with complex observation model and small observation noise of the GCF over the Gaussian particle filter (GPF) and the lower complexity, more amenable for parallel implementation than the CF. The Simula-tion in the Tracking domain demonstrates the good performance of the GCF.
Design of a Low-Noise Front-End Readout Circuit for CdZnTe Detectors  [PDF]
Bo Gan, Tingcun Wei, Wu Gao, Huiming Zeng, Yann Hu
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.42017
Abstract:

In this paper, the design of a novel low-noise front-end readout circuit for Cadmium zinc telluride (CdZnTe) X-ray and γ-ray detectors is described. The front-end readout circuits include the charge sensitive amplifier (CSA) and the CR-RC shaper is implemented in TSMC 0.35 μm mixed-signal CMOS technology. The die size of the prototype chip is 4.9 mm × 2.2 mm. The simulation results show that, the noise performance is 46 electrons + 10 electrons/pF, and power consumption is 1.65 mW per channel.

Construction of a Shuttle Vector for Heterologous Gene Expression in Escherichia coli and Microalgae Anabaena  [PDF]
Donghui Song, Jing Li, Xiaoxu Hu, Bo Xi
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B111
Abstract:

Theconstruction of an integrative shuttle expression vector and potential utility was reported inEscherichiacoliandAnabaena(Nostoc) sp. strain PCC 7120. The vector comprised of the following elements: (a) an intergenic non-coding region fromAnabaenato facilitate its genomic integration (b) a strong functional PpsbAIpromoter fromAnabaenafor desired gene expression and (c) neomycin phosphotransferase gene with its own promoter for the selection of transfor-mants. The constructed vectorpAnFP was evaluated by cloning, transfer and expression of thegfpgene encoding green fluorescent protein. When theE.coliandAnabaenasp. strain PCC 7120 were transformed, intensive green fluorescence produced by the products of GFP protein was observed. This result indicated that the integrative shuttle vector pAnFP can be promisingly used in genome transformation for expression of heterologous genes inE.coliand microalgae such asAnabaenaandNostocstrains.

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