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Search Results: 1 - 10 of 18398 matches for " Yanhao Peng "
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Ad Hoc On-Demand Multipath Distance Vector Routing Protocol Based on Node State  [PDF]
Jieying Zhou, Heng Xu, Zhaodong Qin, Yanhao Peng, Chun Lei
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2075
Abstract:

To improve the performance of Ad hoc on-demand multipath distance vector (AOMDV) protocol, we proposed NS-AOMDV which is short for “AOMDV based on node state”. In NS-AOMDV, we introduce node state to improve AOMDV’s performance in selecting main path. In route discovery process, the routing update rule calculates the node weight of each path and sorts the path weight by descending value in route list, and we choose the path which has the largest path weight for data transmission. NS-AOMDV also uses the technology of route request (RREQ) packet delay forwarding and energy threshold to ease network congestion, limit the RREQ broadcast storm, and avoid low energy nodes to participate in the establishment of the path. The results of simulation show that NS-AOMDV can effectively improve the networks’packets delivery rate, throughput and normalized routing overhead in the situation of dynamic network topology and heavy load.

Biomimetic fabrication and characterization of an artificial rice leaf surface with anisotropic wetting
Jia Yao,JianNan Wang,YanHao Yu,Han Yang,Ying Xu
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5220-1
Abstract: In nature, rice leaves exhibit special anisotropic sliding capabilities. Although researchers have succeeded in fabricating artificial rice leaf structures and realizing the wettability function of the leaf surface, these methods used to date are complex and do not allow the fabrication of surfaces with large area. Herein, we adopted a simple technology - two steps soft transfer to fabricate biomimetic rice leaf. The fabricated surface well reproduced the structures of the rice leaf surface and exhibited a static superhydrophobic property similar to that of the real rice leaf surface. In terms of its dynamic wettability, it clearly exhibited an anisotropic sliding property. Systematic measurements showed that the sliding angles parallel and perpendicular with the vein direction were 25° and 40°, respectively. The method was simple and reliable, without the need for expensive instruments and complex technologies, which could be used for the rapid fabrication of large-area artificial rice leaf surfaces. We believe that the artificial rice leaf surface fabricated by this method has great potential applications in biomimetic functional surfaces, microfluidics, and so on.
Studies on Isothermal Adsorption of Zinc Dialkyldithiophosphate on Iron Surface
二烷基二硫代磷酸锌在铁表面等温吸附的研究

Zhang Yanhao,
章燕豪
,姚洪熹

摩擦学学报 , 1993,
Abstract: 本文对二烷基二硫化磷酸锌在不同温度下自液体石蜡溶液中于铁表面的等温吸附进行了试验研究。结果表明,在285-353K的温度范围内,恒温搅拌3小时就基本达到了吸附平衡。在285K和303K这两种温度下的吸附等温线均属S型曲线,这表明二烷基二硫代磷酸锌主要是以分子形态和表面反胶的形式被吸附;而其在较高温度(333K和353K)下的吸附等温线却发生了显著的变化,这是二烷基二硫代磷酸锌在铁表面催化分解和氧化
Instability of CTG Repeats is Governed by the Position of a DNA Base Lesion through Base Excision Repair
Yanhao Lai, Meng Xu, Zunzhen Zhang, Yuan Liu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0056960
Abstract: Trinucleotide repeat (TNR) expansions and deletions are associated with human neurodegeneration and cancer. However, their underlying mechanisms remain to be elucidated. Recent studies have demonstrated that CAG repeat expansions can be initiated by oxidative DNA base damage and fulfilled by base excision repair (BER), suggesting active roles for oxidative DNA damage and BER in TNR instability. Here, we provide the first evidence that oxidative DNA damage can induce CTG repeat deletions along with limited expansions in human cells. Biochemical characterization of BER in the context of (CTG)20 repeats further revealed that repeat instability correlated with the position of a base lesion in the repeat tract. A lesion located at the 5′-end of CTG repeats resulted in expansion, whereas a lesion located either in the middle or the 3′-end of the repeats led to deletions only. The positioning effects appeared to be determined by the formation of hairpins at various locations on the template and the damaged strands that were bypassed by DNA polymerase β and processed by flap endonuclease 1 with different efficiency. Our study indicates that the position of a DNA base lesion governs whether TNR is expanded or deleted through BER.
Bio-reduction of nitrate from groundwater using a hydrogen-based membrane biofilm reactor

Siqing Xi,Fohua Zhong,Yanhao Zhang,Haixiang Li,Xin Yang,

环境科学学报(英文版) , 2010,
Abstract: A hydrogen-based membrane biofilm reactor(MBfR) using H2 as electron donor was investigated to remove nitrate from groundwater.When nitrate was first introduced to the MBfR,denitrification took place on the shell side of the membranes immediately,and the effluent concentration of nitrate continuously decreased with 100% removal rate on day 45 under the influent nitrate concentration of 5 mg NO3--N/L,which described the acclimating and enriching process of autohydrogenotrophic denitrification bacteria.A seri...
Nondestructive Evaluation of Historic Hakka Rammed Earth Structures
Ruifeng Liang,Gangarao Hota,Ying Lei,Yanhao Li,Daniel Stanislawski,Yongqiang Jiang
Sustainability , 2013, DOI: 10.3390/su5010298
Abstract: The in-service Hakka rammed earth buildings, in the Fujian Province of China, are unique in design and performance. Their UNESCO’s inscription as World Heritage sites recognizes their artistic, cultural, social and historic significance. Sponsored by the National Science Foundation of the United States, the authors have examined the engineering values of these buildings in terms of comfortable living at low energy consumption, sustainability and durability. The objective of this study was to better understand the thermo-mechanical and aging responses of Hakka earth buildings under thermal and earthquake loads through nondestructive field evaluation, including full-scale roof truss and floor testing, laboratory testing of field samples and finite element modeling. This paper presents our observations and findings from the field nondestructive evaluations with emphasis on the integrity of the rammed earth outer walls and inner wood structures, as well as the thermal comfort of living in these buildings, while a second paper presents the results from the material characterization of field samples and the structural responses of a representative building under earthquake induced loads through finite element analysis.
Near Unity Optical Spin Polarization in GaSe Nanoslabs
Yanhao Tang,Wei Xie,Krishna C. Mandal,John A. McGuire,C. W. Lai
Physics , 2014, DOI: 10.1103/PhysRevB.91.195429
Abstract: We report nearly complete preservation of "spin memory" between optical absorption and photoluminescence (PL) in nanometer slabs of GaSe pumped with 0.2 eV excess energy. At cryogenic temperatures, the initial degree of circular polarization ($\rho_0$) of PL approaches unity, with the major fraction of the spin polarization decaying with a time constant $>$500 ps in sub-100-nm GaSe nanoslabs. Even at room temperature, $\rho_0$ as large as 0.7 is observed, while pumping 1 eV above the band edge yields $\rho_0$ = 0.15. Angular momentum preservation for both electrons and holes is due to the separation of the non-degenerate conduction and valence bands from other bands. In contrast to valley polarization in atomically thin TMDs, here optical spin polarization is preserved in nanoslabs of 100 layers or more of GaSe.
Linearly polarized remote-edge luminescence in GaSe nanoslabs
Yanhao Tang,Wei Xie,Krishna C. Mandal,John A. McGuire,Chih-Wei Lai
Physics , 2015, DOI: 10.1103/PhysRevApplied.4.034008
Abstract: We report highly linearly polarized remote luminescence that emerges at the cleaved edges of nanoscale gallium selenide slabs tens of micrometers away from the optical excitation spot. The remote-edge luminescence (REL) measured in the reflection geometry has a degree of linear polarization above 0.90, with polarization orientation pointing toward the photoexcitation spot. The REL is dominated by an index-guided optical mode that is linearly polarized along the crystalline $c$-axis. This luminescence is from out-of-plane dipoles that are converted from in-plane dipoles through a spin-flip process at the excitation spot.
Exciton spin dynamics in GaSe
Yanhao Tang,Wei Xie,Krishna C. Mandal,John A. McGuire,Chih-Wei Lai
Physics , 2015, DOI: 10.1063/1.4930809
Abstract: We analyze exciton spin dynamics in GaSe under nonresonant circularly polarized optical pumping with an exciton spin-flip rate-equation model. The model reproduces polarized time-dependent photoluminescence measurements in which the initial circular polarization approaches unity even when pumping with 0.15 eV excess energy. At T = 10 K, the exciton spin relaxation exhibits a biexponential decay with a sub-20 ps and a >500 ps time constants, which are also reproduced by the rate-equation model assuming distinct spin-relaxation rates for hot (nonequilibrium) and cold band-edge excitons.
Optical Spin Polarization Dynamics in GaSe Nanoslabs
Yanhao Tang,Wei Xie,Krishna C. Mandal,John A. McGuire,Chih-Wei Lai
Physics , 2015, DOI: 10.1103/PhysRevB.91.195429
Abstract: We report nearly complete preservation of "spin memory" between optical absorption and photoluminescence (PL) in nanometer slabs of GaSe pumped with up to 0.2 eV excess energy. At cryogenic temperatures, the initial degree of circular polarization ($\rho_0$) of PL approaches unity, with the major fraction of the spin polarization decaying with a time constant $>$500 ps in sub-100-nm GaSe nanoslabs. Even at room temperature, $\rho_0$ as large as 0.7 is observed, while pumping 1 eV above the band edge yields $\rho_0$ = 0.15. Angular momentum preservation for both electrons and holes is due to the separation of the non-degenerate conduction and valence bands from other bands. In contrast to valley polarization in atomically thin transition metal dichalcogenides, here optical spin polarization is preserved in nanoslabs of 100 layers or more of GaSe.
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