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Search Results: 1 - 10 of 254174 matches for " Chen Lin H "
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Surface deformation detected by the space-observed small baseline SAR interferometry over permafrost environment in Tibet Plateau, China
F. Chen,H. Lin
The Cryosphere Discussions , 2012, DOI: 10.5194/tcd-6-4071-2012
Abstract: The evolution of permafrost and the active layer is highly related to climate change because of its feedback effects involving water and carbon storage. In this study, we firstly examined the relationship of regional water balance, geomorphological process and anthropogenic activities by means of Small Baseline Synthetic Aperture Radar Interferometry (SB-InSAR) to monitor the surface movements overlaid on the permafrost of Tibet Plateau (TP), China, using 3.5-yr observation span of L-band ALOS PALSAR data (June, 2007 to December, 2010). The estimated displacements (primarily in the range of 30 mm yr 1 to 30 mm yr 1) and time-series implied evolutions of the active layer and permafrost beneath. The motion trend along slopes was complicated, and thus interdisciplinary interpretations were required. Water level variations of inland lakes were then detected, although further investigations were required for validation. Anthropogenic influences on this frail permafrost environment were significant, proved by the remarkable surface settlement along the embankment of Qinghai-Tibet Railway. Consequently, it is crucial and necessary to monitor this arid and cold plateau owing to the combination of climate change, geo-hazards prediction as well as the regional sustainable development.
On a direct construction of inverse scattering problems for integrable nonlinear evolution equations in the two-spatial dimension
H. H. Chen,J. E. Lin
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s0161171204312408
Abstract: We present a method to construct inverse scattering problems for integrable nonlinear evolution equations in the two-spatial dimension. The temporal component is the adjoint of the linearized equation and the spatial component is a partial differential equation with respect to the spatial variables. Although this idea has been known for the one-spatial dimension for some time, it is the first time that this method is presented for the case of the higher-spatial dimension. We present this method in detail for the Veselov-Novikov equation and the Kadomtsev-Petviashvili equation.
Characterization of the Role of Tumor Necrosis Factor Apoptosis Inducing Ligand (TRAIL) in Spermatogenesis through the Evaluation of Trail Gene-Deficient Mice
Yi-Chen Lin, John H. Richburg
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0093926
Abstract: TRAIL (TNFSF10/Apo2L) is a member of the tumor necrosis factor (TNF) superfamily of proteins and is expressed in human and rodent testis. Although the functional role of TRAIL in spermatogenesis is not known, TRAIL is recognized to induce apoptosis via binding to its cognate receptors; DR4 (TRAIL-R1/TNFRSF10A) and DR5 (TRAIL-R2/TNFRSF10B). Here, we utilize Trail gene-deficient (Trail?/?) mice to evaluate the role of TRAIL in spermatogenesis by measuring testis weight, germ cell apoptosis, and spermatid head count at postnatal day (PND) 28 (pubertal) and PND 56 (adult). Trail?/? mice have significantly reduced testis to body weight ratios as compared to wild-type C57BL/6J at both ages. Also, Trail?/? mice (PND 28) show a dramatic increase in basal germ cell apoptotic index (AI, 16.77) as compared to C57BL/6J (3.5). In the testis of adult C57BL/6J mice, the AI was lower than in PND 28 C57BL/6J mice (2.2). However, in adult Trail?/? mice, the AI was still higher than that of controls (9.0); indicating a relative high incidence of germ cell apoptosis. Expression of cleaved caspase-8 (CC8) and cleaved caspase-9 (CC9) (markers of the extrinsic and intrinsic apoptotic pathway, respectively) revealed a two-fold increase in the activity of both pathways in adult Trail?/? mice compared to C57BL/6J. Spermatid head counts in adult Trail?/? mice were dramatically reduced by 54% compared to C57BL/6J, indicating these animals suffer a marked decline in the production of mature spermatozoa. Taken together, these findings indicate that TRAIL is an important signaling molecule for maintaining germ cell homeostasis and functional spermatogenesis in the testis.
Variation of Superconducting Transition Temperature in Hole-Doped Copper-Oxides
X. J. Chen,H. Q. Lin
Physics , 2003, DOI: 10.1103/PhysRevB.69.104518
Abstract: The experimentally observed difference of superconducting critical temperature $T_{c}$ in hole-doped cuprates is studied by using an extended interlayer coupling model for layered d-wave superconductors. We show that the change of the maximum $T_{c}$ from series to series is determined by the next nearest neighboring hopping $t^{\prime}$, while the difference of the maximum $T_{c}$ among the compounds in a homogeneous series is controlled by the interlayer pairing strength. Our results provide helpful guidelines in the search for new high-$T_{c}$ superconductors.
Effect of Low-Frequency Alternative-Current Magnetic Susceptibility in Thin Films
Yuan-Tsung Chen,S. H. Lin,Y. C. Lin
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/186138
Abstract: X-ray diffraction (XRD) results indicate that the NiFe thin films had a face-centered cubic (FCC) structure. Post-annealing treatment increased the crystallinity of NiFe films over those at room temperature (RT), suggesting that NiFe crystallization yields FCC (111) texturing. Post-annealing treatments increase crystallinity over that obtained at RT. This paper focuses on the maximum alternative-current magnetic susceptibility (ac) value of NiFe thin films with resonance frequency (res) at low frequencies from 10 Hz to 25000 Hz. These results demonstrate that the ac of NiFe thin films increased with post-annealing treatment and increasing thickness. The NiFe (111) texture suggests that the relationship between magneto-crystalline anisotropy and the maximum ac value with optimal resonance frequency (res) increased spin sensitivity at optimal res. The results obtained under the three conditions revealed that the maximum ac value and optimal res of a 1000 Å-thick NiFe thin film are 3.45 Hz and 500 Hz, respectively, following postannealing at A=250°C for 1 h. This suggests that a 1000 Å NiFe thin film post-annealed at A=250°C is suitable for gauge sensor and transformer applications at low frequencies.
Parametric Study on a Caisson Based OWC Wave Energy Converting System  [PDF]
Hsien Hua Lee, Y.-F. Chiu, C.-Y. Lin, C.-H. Chen, M.-H. Huang
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43D026
This study uses a numerical method to analyze the proposed model structure. Before the parametric analysis, a pre-analysis to make sure the analytical results are accountable, a verification analysis was performed. The results found are compared well with the limited experimental findings of Goda et al. and it is very encouraging to find that for the proposed method as an alternative for green energy developments, as long as an appropriate design is performed, an OWC combined with breakwater structure may provide an alternative for green energy system utilized in a harbor area. From the results of the first stage of parameter analysis that the size of the openings of the cell of converting system is variable, a traditional full opened cell is not necessary the most efficient design for the wave power conversion in terms of the variations of air pressure inside the cell and air speed through the outlet orifice that will drive the electricity power generator.
Differential expression of early viral gene BmORF51 in Bombyx mori nucleopolyhedrovirus infection of resistant and susceptible silkworms
F Lin, Q Yao, H Chen, Y Zhou, K Chen
African Journal of Biotechnology , 2010,
Abstract: Open reading frame 51 of Bombyx mori nucleopolyhedrovirus (Bm51) is a homologue of autographa californica multiple NPV ORF63. In this study, the expression profiles of Bm51 in the resistant strain NB and the susceptible strain 306 were characterized, and Bm51 gene was amplified from BmNPV genomic DNA by polymerase chain reaction (PCR) and cloned into Escherichia coli expression vector pET-30a (+). The recombinant His-tagged Bm51 protein was expressed in E. coli BL21 (DE3) and purified by metal chelating affinity chromatography to produce antibodies against Bm51 protein. The amino acid sequence of recombinant protein was confirmed by mass spectroscopic analysis. The transcription and protein product of early viral gene, Bm51, was detected at 6 h post-infection (p.i.) in resistant strain NB by quantitative real-time (qRT)-PCR and western blotting, and the expression of Bm51 in NB reached the maximal level at 36 h p.i. in NB, and then gradually decreased to undetectable level at 72 h p.i. In contrast, the Bm51 protein was undetectable until 12 h p.i. in susceptible strain 306 and the expression of Bm51 progressively increased during the 72 h post-infection.
New Views of EIT Wave and CME from STEREO
S. Ma,J. Lin,P. Chen,H. Chen
Physics , 2009,
Abstract: On 2007 December 7, a small filament located in a small active region AR 10977 erupted and led to a B1.4 flare. An EIT wave associated with this eruption was observed both by SOHO/EIT and by EUVI on board STEREO. According to the observations from SOHO/LASCO and STEREO/COR A, we found that there was no CME associated with the EIT wave. This seems to challenge the argument that the cause of EIT waves is CME. However the data from STEREO/COR B indicated that there was a narrow CME associated with the EIT wave. This suggests that studying CMEs by investigating observations made in one direction alone may not be able to guarantee the reliability of the results.
Hybrid 3-D Formation Control for Unmanned Helicopters
A. Karimoddini,H. Lin,B. M. Chen,T. H. Lee
Mathematics , 2011,
Abstract: Teams of Unmanned Aerial Vehicles (UAVs) form typical networked cyber-physical systems that involve the interaction of discrete logic and continuous dynamics. This paper presents a hybrid supervisory control framework for the three-dimensional leader follower formation control of unmanned helicopters. The proposed hybrid control framework captures internal interactions between the decision making unit and the path planner continuous dynamics of the system, and hence improves the system's overall reliability. To design such a hybrid controller, a spherical abstraction of the state space is proposed as a new method of abstraction. Utilizing the properties of multi-affine functions over the partitioned space leads to a finite state Discrete Event System (DES) model, which is shown to be bisimilar to the original continuous-variable dynamical system. Then, in the discrete domain, a logic supervisor is modularly designed for the abstracted model. Due to the bisimilarity between the abstracted DES model and the original UAV dynamics, the designed logic supervisor can be implemented as a hybrid controller through an interface layer. This supervisor drives the UAV dynamics to satisfy the design requirements. In other words, the hybrid controller is able to bring the UAVs to the desired formation starting from any initial state inside the control horizon and then, maintain the formation. Moreover, a collision avoidance mechanism is embedded in the designed supervisor. Finally, the algorithm has been verified by a hardware-in-the-loop simulation platform, which is developed for unmanned helicopters. The presented results show the effectiveness of the algorithm.
Enhancement of random lasing assisted by light scattering and resonance energy transfer based on ZnO/SnO nanocomposites
C. S. Wang,H. Y. Lin,T. H. Lin,Y. F. Chen
AIP Advances , 2012, DOI: 10.1063/1.3684634
Abstract: A new composite consisting of ZnO nanorods and SnO nanoparticles has been synthesized and characterized. It is found that the UV laser emission from ZnO NRs can be greatly enhanced and more easily achieved by the assistance of SnO NPs. The underlying mechanism is interpreted in terms of light scattering, charge carrier transfer and fluorescence resonance energy transfer (FRET) mediated by SnO NPs. Our strategy opens a promising route for improving the external conversion efficiency of optoelectronic devices.
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