121 research outputs found
Multi-pulse oscillation and instabilities in microchip self-Q-switched transverse-mode laser
Xiamen University (NCETXMU); Ministry of Education, Science and Culture of JapanMulti-transverse-mode competition, coupling induced instabilities and multi-pulse or satellite pulse oscillations were investigated experimentally and theoretically in laser-diode-pumped Cr, Nd:YAG self-Q-switched microchip lasers under large pump beam diameter. The different transverse modes have great effects on the laser pulse temporal characteristics such as pulse profile, pulse width, instability of peak power and repetition rate jitter. Multi-transverse-mode, multi-pulse oscillation and periodical pulsation were observed by varying the pump beam diameter. The effect of transverse modes on the instability and multi-pulse oscillation were studied by modified coupled rate equations by taking into account the transverse-mode competition of inversion population under different pump conditions. The numerically simulated results are in good agreement with the experimental results. These results show that the multi-pulse oscillation and instability in the pulse train were attributed to different transverse mode coupling and competition. The peak power instabilities and pulse repetition rate jitter of the laser pulses due to transverse mode coupling were also investigated. (C) 2009 Optical Society of Americ
Performance of compact plastic scintillator strips with WLS-fiber and PMT/SiPM readout
This work presents the design and performance study of compact strips of
plastic scintillator with WLS-fiber readout in a dimension of 0.1 * 0.02 * 2
m3, which evaluates as a candidate for cosmic-ray muon detector for JUNO-TAO.
The strips coupling with 3-inch PMTs are measured and compared between the
single-end and double-end readout options first, and the strip of double-end
option coupling with SiPM is further measured and compared with the results of
that with the PMTs. The performance of the strips determined by a detailed
survey along their length with cosmic-ray muon after a detailed
characterization of the used 3-inch PMTs and SiPMs.The proposed compact strip
of plastic scintillator with WLS-fiber coupling with SiPM provides a good
choice for cosmic-ray muon veto detector for limited detector dimension in
particular
Immobilizing chromate reductase NfoR on magnetic biochar reduced Cr(VI) in copper-containing wastewater
Particle-hole asymmetric ferromagnetism and spin textures in the triangular Hubbard-Hofstadter model
In a lattice model subject to a perpendicular magnetic field, when the
lattice constant is comparable to the magnetic length, one enters the
"Hofstadter regime," where continuum Landau levels become fractal magnetic
Bloch bands. Strong mixing between bands alters the nature of the resulting
quantum phases compared to the continuum limit; lattice potential, magnetic
field, and Coulomb interaction must be treated on equal footing. Using
determinant quantum Monte Carlo (DQMC) and density matrix renormalization group
(DMRG) techniques, we study this regime numerically in the context of the
Hubbard-Hofstadter model on a triangular lattice. In the field-filling phase
diagram, we find a broad wedge-shaped region of ferromagnetic ground states for
filling factor , bounded by incompressible states at filling
factor . For magnetic field strengths , we
observe signatures of SU(2) quantum Hall ferromagnetism in the lowest magnetic
Bloch band; however, we find no numerical evidence for conventional quantum
Hall skyrmions. At large fields , above the
ferromagnetic wedge, we observe a low-spin metallic region with spin
correlations peaked at small momenta. We argue that the phenomenology of this
region likely results from exchange interaction mixing fractal Hofstadter
subbands. The phase diagram derived beyond the continuum limit points to a rich
landscape to explore interaction effects in magnetic Bloch bands.Comment: 15 pages, 15 figure
Porous carbon directed growth of carbon modified MnO2 porous spheres for pseudocapacitor applications
Carbon modified MnO2 (CMMO) spheres have been fabricated through a facile low temperature (60 degrees C) hydrothermal method using mesoporous carbon spheres as reductive agent and sacrificial template and KMnO4 as manganese source. CMMO spheres with novel nanostructures such as flower-like and sea urchin-like are obtained by controlling the reaction time. The roles of mesoporous carbon in directing the growth of the CMMO spheres and controlling their morphologies have been investigated. The CMMO spheres are characterized by XRD, XPS, SEM, TEM, Raman spectra, TGA and N-2 adsorption-desorption technique and electrochemical measurement. The resulted samples possess unique morphologies and regular pores, and their properties changed as reaction time proceed. The peseudocapacitive behaviors of the as-prepared samples are tested in two-electrode supercapacitors using 2 mol L-1 KOH aqueous solutions as electrolyte. A high gravimetric capacitance of 344 F g(-1) at 1 A g(-1) and the capacity retaining of 75% after 5000 cycles are achieved on the electrode prepared with one of the CMMO samples. The other CMMO samples also possess excellent electrochemical performance in comparison with the pristine mesoporous carbon (p-MC). Such superior electrochemical performance makes the porous CMMO spheres to be promising materials in the application of pseudocapacitors. (C) 2017 Elsevier B.V. All rights reserved
A multimodal psychological, physiological and behavioural dataset for human emotions in driving tasks
Human emotions are integral to daily tasks, and driving is now a typical daily task. Creating a multi-modal human emotion dataset in driving tasks is an essential step in human emotion studies. we conducted three experiments to collect multimodal psychological, physiological and behavioural dataset for human emotions (PPB-Emo). In Experiment I, 27 participants were recruited, the in-depth interview method was employed to explore the driver’s viewpoints on driving scenarios that induce different emotions. For Experiment II, 409 participants were recruited, a questionnaire survey was conducted to obtain driving scenarios information that induces human drivers to produce specific emotions, and the results were used as the basis for selecting video-audio stimulus materials. In Experiment III, 40 participants were recruited, and the psychological data and physiological data, as well as their behavioural data were collected of all participants in 280 times driving tasks. The PPB-Emo dataset will largely support the analysis of human emotion in driving tasks. Moreover, The PPB-Emo dataset will also benefit human emotion research in other daily tasks
Real-time Monitoring for the Next Core-Collapse Supernova in JUNO
Core-collapse supernova (CCSN) is one of the most energetic astrophysical
events in the Universe. The early and prompt detection of neutrinos before
(pre-SN) and during the SN burst is a unique opportunity to realize the
multi-messenger observation of the CCSN events. In this work, we describe the
monitoring concept and present the sensitivity of the system to the pre-SN and
SN neutrinos at the Jiangmen Underground Neutrino Observatory (JUNO), which is
a 20 kton liquid scintillator detector under construction in South China. The
real-time monitoring system is designed with both the prompt monitors on the
electronic board and online monitors at the data acquisition stage, in order to
ensure both the alert speed and alert coverage of progenitor stars. By assuming
a false alert rate of 1 per year, this monitoring system can be sensitive to
the pre-SN neutrinos up to the distance of about 1.6 (0.9) kpc and SN neutrinos
up to about 370 (360) kpc for a progenitor mass of 30 for the case
of normal (inverted) mass ordering. The pointing ability of the CCSN is
evaluated by using the accumulated event anisotropy of the inverse beta decay
interactions from pre-SN or SN neutrinos, which, along with the early alert,
can play important roles for the followup multi-messenger observations of the
next Galactic or nearby extragalactic CCSN.Comment: 24 pages, 9 figure
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