6,250 research outputs found
Mixed Perspectives and Thematic Analysis in Design Education
This research explores the design of products based on users’ emotional requirements and how students can be stimulated to generate novel ideas in design education. In order to achieve these aims, multiple methods were taught to students during an online course. In the first step, the students utilised interviews, questionnaires, and mixed perspectives to design hill censers according to the users’ emotional requirements. In the second step, the researcher conducted a qualitative thematic analysis to study the students’ collected survey reports. The analytic results were then shared with students to help them quickly obtain better novel design ideas. And then, an emotional design appraisal model was built in the third step. The two main findings are as follows: first, creation in light of the stakeholder’s perspective enabled the students to come up with better design ideas quickly. Second, the ‘design method’ and ‘emotional experience’ themes obtained by the thematic analysis were found to be vital for the designers/students. Notably, the ‘design method’ theme can help students generate novel design ideas, and the students can learn the users’ needs from the ‘emotional experience’ theme
New Constraints on Radiative Decay of Long-Lived Particles in Big Bang Nucleosynthesis with New He Photodisintegration Data
A recent measurement of He photodisintegration reactions,
He(,)H and He(,)He with laser-Compton
photons shows smaller cross sections than those estimated by other previous
experiments at MeV. We study big-bang nucleosynthesis
with the radiative particle decay using the new photodisintegration cross
sections of He as well as previous data. The sensitivity of the yields of
all light elements D, T, He, He, Li, Li and Be to the cross
sections is investigated. The change of the cross sections has an influence on
the non-thermal yields of D, He and He. On the other hand, the
non-thermal Li production is not sensitive to the change of the cross
sections at this low energy, since the non-thermal secondary synthesis of
Li needs energetic photons of MeV. The non-thermal
nucleosynthesis triggered by the radiative particle decay is one of candidates
of the production mechanism of Li observed in metal-poor halo stars
(MPHSs). In the parameter region of the radiative particle lifetime and the
emitted photon energy which satisfies the Li production above the abundance
level observed in MPHSs, the change of the photodisintegration cross sections
at MeV as measured in the recent experiment leads to
% reduction of resulting He abundance, whereas the Li
abundance does not change for this change of the cross sections of
He(,)H and He(,)He. The Li abundance,
however, could show a sizable change and therefore the future precise
measurement of the cross sections at high energy 50 MeV is
highly required.Comment: 10 pages, 7 figures, conclusion not changed, to be published in PR
Behaviours of Bubbles in the Gas-Solid Fluidized-Beds
The size, shape and rising velocity of bubbles and also particle concentration in bubbles which appeared in the air-solid fluidized bed were investigated by photography, X-ray photograpy, X-ray cinematography and capacitance method. The results were that the bubbles had nearly the shape of spherical cap and there were few particles in the bubbles. Although the rising velocity of the bubble was affected largely by other bubbles, it was proportional to the square root of the vertical bubble length and the bubbles became large with the process of repetition of coalescence and redispersion
The correlation between the 500 pc scale molecular gas masses and AGN powers for massive elliptical galaxies
Massive molecular clouds have been discovered in massive elliptical galaxies
at the center of galaxy clusters. Some of this cold gas is expected to flow in
the central supermassive black holes and activate galactic nucleus (AGN)
feedback. In this study, we analyze archival ALMA data of 9 massive elliptical
galaxies, focusing on CO line emissions, to explore the circumnuclear gas. We
show that the mass of the molecular gas within a fixed radius (500 pc) from the
AGNs (M_mol ~ 10^7-10^8 M_sun) is correlated with the jet power estimated from
X-ray cavities (P_cav ~ 10^42-10^45 erg/s). The mass accretion rate of the
circumnuclear gas \dot{M} also has a correlation with P_cav. On the other hand,
the continuum luminosities at ~1.4 GHz and ~100-300 GHz have no correlation
with M_mol. These results indicate that the circumnuclear gas is sustaining the
long-term AGN activities (~10^7 yr) rather than the current ones. The
circumnuclear gas mass is a better indicator of the jet power than the
continuum luminosity, which probably changes on a shorter time scale. We also
study the origin of the continuum emission from the AGNs at ~100-300 GHz and
find that it is mostly synchrotron radiation. For low-luminosity AGNs, however,
dust emission appears to contaminate the continuum.Comment: Accepted for publication in PAS
Application of Hamamatsu MPPC to T2K Neutrino Detectors
A special type of Hamamatsu MPPC, with a sensitive area of 1.3x1.3mm^2
containing 667 pixels with 50x50um^2 each, has been developed for the near
neutrino detector in the T2K long baseline neutrino experiment. About 60 000
MPPCs will be used in total to read out the plastic scintillator detectors with
wavelength shifting fibers. We report on the basic performance of MPPCs
produced for T2K.Comment: Contribution to the proceedings of NDIP 2008, Aix-les-Bains, France,
June 15-20, 200
Data-Driven Optimal Sensor Placement for High-Dimensional System Using Annealing Machine
We propose a novel method for solving optimal sensor placement problem for
high-dimensional system using an annealing machine. The sensor points are
calculated as a maximum clique problem of the graph, the edge weight of which
is determined by the proper orthogonal decomposition (POD) mode obtained from
data based on the fact that a high-dimensional system usually has a
low-dimensional representation. Since the maximum clique problem is equivalent
to the independent set problem of the complement graph, the independent set
problem is solved using Fujitsu Digital Annealer. As a demonstration of the
proposed method, the pressure distribution induced by the K\'arm\'an vortex
street behind a square cylinder is reconstructed based on the pressure data at
the calculated sensor points. The pressure distribution is measured by
pressure-sensitive paint (PSP) technique, which is an optical flow diagnose
method. The root mean square errors (RMSEs) between the pressure measured by
pressure transducer and the reconstructed pressures (calculated from the
proposed method and an existing greedy method) at the same place are compared.
As the result, the similar RMSE is achieved by the proposed method using
approximately 1/5 number of sensor points obtained by the existing method. This
method is of great importance as a novel approach for optimal sensor placement
problem and a new engineering application of an annealing machine
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