In J-PARC heavy-ion project, we aim at studies of QCD phase structures and hadron properties in high baryon density close to the neutron star core. We have developed a heavy-ion acceleration scheme ...with a new linac and a new booster with existing two synchrotrons with the goal beam rate of about 1011 Hz. We have also designed a large acceptance spectrometer based on a toroidal magnet. We have evaluated the spectrometer performance, and demonstrated reconstructing dielectron and dimuon spectra with full detector simulations. Finally, we designed a hypernuclear spectrometer which can utilize the full intensity ion beams.
This paper presents the results of measurements of physical aging on polystyrene with a narrow molecular weight distribution (
M
w/
M
n
=
1.03). The evolution of the aging process was followed by ...recording the relaxed enthalpy and the accompanying decrease in volume, using differential scanning calorimetry and mercury-in-glass dilatometry, respectively. The measurements were carried out after cooling the sample at constant rate to the aging temperature. The cooling rate varied between 0.0037 and 1
°C/min. The aging data were fitted with the KWW and the TNM functions. The differences in the time scales of enthalpy,
h, and volume,
v, relaxation were relatively small. From the
h(
v) graphs the derivative d
h/d
v was found to amount to about 1.8
GPa, a value significantly exceeding the predictions of the thermodynamic model containing an additional internal variable.
The flow of a polymer melt through a flat spiral distribution system used in “stacked” type dies was analyzed through three‐dimensional finite element simulations, and predictions of the exit flow ...variation were compared to experimental measurements. Both isothermal and non‐isothermal simulations were carried out, and the non‐isothermal results were found to be in close agreement with the measured flow variation. It was found that for this particular flat spiral die, viscous dissipation is extremely crucial and may lead to generation of hot spots and to increased flow variation. Finally, the effect of material viscoelasticity on the flow field was simulated by using a CEF constitutive equation. It was shown that neglecting viscoelastic effects due to shear deformation, represented by primary and secondary normal stress coefficients, in the modeling of the flow in the flat spiral dies is a reasonable simplification. On the other hand, extensional behavior should be taken into account for a more suitable description of the leakage flows within this type of die.
The fundamental motivation to study the non-mesonic weak decay (NMWD) of hypernuclei is that it provides the unique means for study of baryon–baryon weak interaction in
SU
3
f
symmetry group. The new ...channel of NMWD, namely the recently confirmed three-body channel, seems to have a surprisingly big branching ratio so that it makes its accurate measurement prerequisite of the baryon–baryon weak interaction study. We report a new result of
from E508 experiment of KEK-PS, though preliminary yet, which agrees with the previous result of
C from the same experiment, those from FINUDA experiment and those of the recent theoretical predictions.
This work studies the radial orbit instability for a family of anisotropic isochrone spheres by a numerical linear stability analysis, and then compares the results with N-body simulations. A new way ...of choosing basis functions for the modes is introduced that allows spatially infinite systems to be handled without truncation. Previous studies of the same models, by adiabatic deformation and by N-body integrations, found instability for $\langle\upsilon _{r}^{2}\rangle/\langle\upsilon _{\theta}^{2}\rangle\gtrsim2;$ the present computations indicate that very slowly growing modes persist for anisotropies as small as $\langle\upsilon _{r}^{2}\rangle/\langle\upsilon _{\theta}^{2}\rangle\simeq 1.4$. For the more unstable models, the shapes and growth rates of the modes are fairly well reproduced in N-body simulations. These results suggest that spherical models are unstable over a wider range of anisotropies than previously supposed.
ASIC design of a high speed low power circuit for factorial calculation of a number is reported in this paper. The factorial of a number can be calculated using iterative multiplication by ...incrementing or decrementing process and iterative multiplication can be computed through parallel implementation methodology. Parallel implementation along with Vedic multiplication methodology for calculation of factorial of a number ensures significant reduction in propagation delay and switching power consumption due to reduction of stages in multiplication process, in comparison with the conventionally used Vedic multiplication methodologies like ‘Urdhva-tiryakbyham’ (UT) and ‘Nikhilam Navatascaramam Dasatah’ (NND) based implementation methodology. Transistor level implementation was carried out using spice specter with standard 90nm CMOS technology and the results were compared with the above mentioned conventional methodologies. The propagation delay for the calculation of 4-bit factorial of a number was only ∼42.13ns while the power consumption of the same was ∼58.82mW for a layout area of ∼6mm2. Improvement in speed was found to be ∼33% and ∼24% while corresponding reduction of power consumption in ∼34.48% and ∼24% for the factorial calculation circuitry in comparison with UT and NND based implementations, respectively.
This paper examined the interaction between roadway geometric characteristics and adverse weather conditions and their impact on crash occurrence on rural variable speed limit freeway corridors ...through mountainous terrain. As a quantitative measure of the effect of geometrics in adverse weather conditions, a crash frequency safety performance function that used generalized linear regression was developed with explanatory variables including snow, ice, frost, wind, horizontal curvature, and steep grades. This research concluded that the interaction between grades and horizontal curves with weather variables had a significant impact on crash occurrence. The research suggested that distinct variable speed limit strategies should be implemented on segments with challenging roadway geometry.
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