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Polarization-dependent Photore Quantum Well Structure
G. J. Jan,C. M. Lai,J. H. Huang 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We have measured the polarization-dependent photore ectance spectra of InGaP/GaAs quantum well structure. These quantum well specimens were grown by gas source molecular beam epitaxy at the growth temperature 440 C, 480 C and 520 C for C1007, C1008 and C1009, respectively. Each of these samples consists of a 7 nm GaAs well, 0.2 m (top) and 1 m (bottom) InGaP barrier. The properties of InGaP layer were obtained by characterized the InGaP/GaAs epilayer sample using double X-ray diraction and low temperature photoluminescence experiments. The results show that the strains of InGaP for all samples are less than 0.2 % and the ordered parameters are about 0.3. The PR spectra demonstrate the anisotropic optical properties. Besides, the energy dierences between the ground states are almost equal to the dierences between bandgap of the InGaP barrier. And the ground state energy is 4 meV less than GaAs bandgap for sample C1009. These results suggest that the transitions of QW structure strongly involve with the partial ordered InGaP barrier by type II band alignment.??
Farrow, Blake,Hong, Sung A,Romero, Errika C.,Lai, Bert,Coppock, Matthew B.,Deyle, Kaycie M.,Finch, Amethist S.,Stratis-Cullum, Dimitra N.,Agnew, Heather D.,Yang, Sung,Heath, James R. American Chemical Society 2013 ACS NANO Vol.7 No.10
<P>We report on a robust and sensitive approach for detecting protective antigen (PA) exotoxin from <I>Bacillus anthracis</I> in complex media. A peptide-based capture agent against PA was developed by improving a bacteria display-developed peptide into a highly selective biligand through <I>in situ</I> click screening against a large, chemically synthesized peptide library. This biligand was coupled with an electrochemical enzyme-linked immunosorbent assay utilizing nanostructured gold electrodes. The resultant assay yielded a limit of detection of PA of 170 pg/mL (2.1 pM) in buffer, with minimal sensitivity reduction in 1% serum. The powdered capture agent could be stably stored for several days at 65 °C, and the full electrochemical biosensor showed no loss of performance after extended storage at 40 °C. The engineered stability and specificity of this assay should be extendable to other cases in which biomolecular detection in demanding environments is required.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-10/nn404296k/production/images/medium/nn-2013-04296k_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn404296k'>ACS Electronic Supporting Info</A></P>
Comparison of Axi-symmetric Single-Hole Nozzle with Multi-Hole Sac Nozzles
( M. C. Lai ),( Y. Zheng ),( X. Xie ),( K. Im ),( S. Moon ),( Z. Liu ),( J. Gao ),( J. Wang ),( J. M. Shi ),( R. E. Winsor ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
It is well know that the internal flow field and nozzle geometry affect the spray behavior, but without high-speed microscopic visualization, it is difficult to characterize the spray structure in details. Single-hole Diesel injectors have been used in fundamental spray research, while most direct-injection engines use multi-hole nozzle to tailor the fuel spray to the combustion chamber geometry. Recent engine trends also use smaller orifice and higher injection pressure. This paper discussed the quasi-steady near-nozzle Diesel spray structures of an axisymmetric single-hole nozzle and a symmetric two-hole nozzle configuration, with a nominal nozzle size of 130 ㎛. Both nozzle holes originate from a sac of identical geometry, but different flow structure inside the nozzle cause significant difference in the observed flow structure near the nozzle exit. The ultrafast fast Phase-contrast X-ray images revealed unique surface and internal morphology of the fuel sprays that can be identified. The two-hole nozzle produces much more unstable jet structure under same injection conditions. The early wavelength developed in the jet is measured to be 30~80 ㎛, depending on the injection conditions. The differences between the nozzle configurations are investigated using CFD simulation. The results show that the three-dimensional fluid flow entering the two-hole nozzle generates stronger streamline curvature and stream-wise vortices which are by default absent in the axisymmetric single-hole nozzle. It also produces thicker shear layer and higher turbulence. The interactions of downwash entrance flow with turbulence potentially enhance the instability and produce wider spray cone angles. The number of holes also has interesting effects on the strength of the vortices and the downwash.
Synchronized Bursting Induced by Network Connectivity in Cortical Neuronal Cultures
L.C. Jia,P.-Y. Lai,C. K. Chan,C.H. Chang,C.R. Han,M.T. Tsai,Y.S. Chou 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.1I
Synchronization of cortical neural cultures is studied as a function of the effective network connectivity in the phenomenon of synchronized firing (SF). The synchronized bursting frequency (during SF) of the network is found to be much slower than the characteristic time scale of a neuron and increases with the network connectivity. Using fluorescence imaging techniques, we found that SF occurs only when the incubation time is longer than some critical age tc and the synchronized bursting frequency f increases with time as f = fc + fo log( t tc ). Furthermore, tc is found to scale with the cell plating density as tc 1 p . Based on the result of photolysis of neurons, the synchronized bursting frequency is shown to be related to the network connectivity, hence, the growth behavior can be inferred from the measured SF frequencies. We further build a network growth model with the characteristics of an early stage active growth followed by a late-stage retarded growth, which can account for the experimental data quantitatively. Electrophysiological measurements using double-patch techniques reveal that even though the bursting frequencies are synchronized, the intra-burst spikes are not. We also present a mean-field model of the neural network that enables the neuron firing to be inhibited and generates inter-spike intervals with long time scales resulting in bursting.
G. J. Jan,B. R. Wu,C. M. Lai,J. H. Huang,Y. L. Yang 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We report the measured results of the temperature dependent photoluminescence (PL) spectra of In$_{0.3}$Ga$_{0.7}$As/GaAs and In$_{0.3}$Ga$_{0.7}$As$_{0.998}$N$_{0.002}$/GaAs single quantum well (SQW) grown by metal-organic chemical vapor deposition (MOCVD). The optical properties of the InGaAs epilayers incorporated with small concentration of nitrogen and two growth temperatures have been investigated. The results show that the optical transition energy on the PL spectra presents the blue shift instead of the red shift raising the growth temperature from 520 $^\circ$C to 550 $^\circ$C with or without nitrogen incorporation. Two (or three) energy features on PL spectrum of InGaAsN SQW grown at growth temperature 520 $^\circ$C were obtained and presumably ascribed to the formation of In-rich clusters. In addition, inverted ``S-curve'' on temperature dependence PL transition energy was observed in InGaAsN SQW grown at 520 $^\circ$C and the carrier localization is interpreted.
Measurement of branching fraction and final-state asymmetry for the B¯0→KS0K∓π± decay
Lai, Y.-T.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Behera, P.,Beleñ,o, C.,Bhuyan, B.,Bilka, T.,Biswal, American Physical Society 2019 Physical Review D Vol.100 No.1