3,098 research outputs found
Generation of a monodispersed aerosol
The identity and laboratory test methods for the generation of a monodispersed aerosol are reported on, and are subjected to the following constraints and parameters; (1) size distribution; (2) specific gravity; (3) scattering properties; (4) costs; (5) production. The procedure called for the collection of information from the literature, commercial available products, and experts working in the field. The following topics were investigated: (1) aerosols; (2) air pollution -- analysis; (3) atomizers; (4) dispersion; (5) particles -- optics, size analysis; (6) smoke -- generators, density measurements; (7) sprays; (8) wind tunnels -- visualization
AN EXPLORATORY STUDY ON DAY LABOURERS IN ELARDUS PARK PRETORIA
On Barnard Street, Elardus Park in Pretoria men are standing, raising a finger or miming a skill to attract the attention of potential employers. It is also common to see men swarm arounda car, pointing to themselves in an effort to get noticed and thus hired. This study deals with these people, who are day labourers leading a difficult life as they manage to survive in anentrepreneurial way. Their main need is to access work more easily. Skills training would make this possible. Social work could make a contribution in this respect
Pressure Induced Static Magnetic Order in Superconducting FeSe_1-x
We report on a detailed investigation of the electronic phase diagram of
FeSe_1-x under pressures up to 1.4GPa by means of AC magnetization and
muon-spin rotation. At a pressure \simeq0.8GPa the non-magnetic and
superconducting FeSe_1-x enters a region where long range static magnetic order
is realized above T_c and bulk superconductivity coexists and competes on short
length scales with the magnetic order below T_c. For even higher pressures an
enhancement of both the magnetic and the superconducting transition
temperatures as well as of the corresponding order parameters is observed.
These exceptional properties make FeSe1-x to be one of the most interesting
superconducting systems investigated extensively at present.Comment: 5 pages, 3 figure
Muon-spin-rotation measurements of the penetration depth in Li_2Pd_3B
Measurements of the magnetic field penetration depth in the ternary
boride superconductor LiPdB ( K) have been carried out by
means of muon-spin rotation (SR). The absolute values of , the
Ginzburg-Landau parameter , and the first and the second
critical fields at T=0 obtained from SR were found to be
nm, , mT, and
T, respectively. The zero-temperature value of the
superconducting gap 1.31(3) meV was found, corresponding to the
ratio . At low temperatures saturates and
becomes constant below , in agreement with what is expected for
s-wave BCS superconductors. Our results suggest that LiPdB is a s-wave
BCS superconductor with the only one isotropic energy gap.Comment: 6 pages, 7 figure
Possible Magnetic Chirality in Optically Chiral Magnet [Cr(CN)][Mn()-pnH(HO)](HO) Probed by Muon Spin Rotation and Relaxation
Local magnetic fields in a molecule-based optically chiral magnet
[Cr(CN)][Mn()-pnH(HO)](HO) (GN-S) and its enantiomer (GN-R) are
studied by means of muon spin rotation and relaxation (muSR). Detailed analysis
of muon precession signals under zero field observed below T_c supports the
average magnetic structure suggested by neutron powder diffraction. Moreover,
comparison of muSR spectra between GN-S and GN-R suggests that they are a pair
of complete optical isomers in terms of both crystallographic and magnetic
structure. Possibility of magnetic chirality in such a pair is discussed.Comment: 5 pages, 5 figures, submitted to J. Phys. Soc. Jp
Evidence for a two component magnetic response in UPt3
The magnetic response of the heavy fermion superconductor UPt_3 has been
investigated on a microscopic scale by muon Knight shift studies. Two distinct
and isotropic Knight shifts have been found for the field in the basal plane.
While the volume fractions associated with the two Knight shifts are
approximately equal at low and high temperatures, they show a dramatic and
opposite temperature dependence around T_N. Our results are independent on the
precise muon localization site. We conclude that UPt_3 is characterized by a
two component magnetic response.Comment: 5 pages, 4 figure
Penetration depth, multiband superconductivity, and absence of muon-induced perturbation in superconducting PrOsSb
Transverse-field muon spin rotation (SR) experiments in the
heavy-fermion superconductor PrOsSb ( K) suggest that
the superconducting penetration depth is temperature-independent
at low temperatures, consistent with a gapped quasiparticle excitation
spectrum. In contrast, radiofrequency (rf) inductive measurements yield a
stronger temperature dependence of , indicative of point nodes in
the gap. This discrepancy appears to be related to the multiband structure of
PrOsSb. Muon Knight shift measurements in PrOsSb
suggest that the perturbing effect of the muon charge on the neighboring
Pr crystalline electric field is negligibly small, and therefore is
unlikely to cause the difference between the SR and rf results.Comment: 10 pages, 7 figure
Study of the magnetic penetration depth in RbOs_2O_6
Measurements of the magnetic field penetration depth \lambda in the
pyrochlore superconductor RbOs_2O_6 (T_c\simeq6.3 K) were carried out by means
of the muon-spin-rotation (\muSR) technique. At low temperatures
\lambda^{-2}(T) saturates and becomes constant below T\simeq 0.2T_c, in
agreement with what is expected for weak-coupled s-wave BCS superconductors.
The value of \lambda at T=0 was found to be in the range of 250 nm to 300 nm.
\muSR and equilibrium magnetization measurements both reveal that at low
temperatures is almost (at the level of 10%) independent of the
applied magnetic field. This result suggests that the superconducting energy
gap in RbOs_2O_6 is isotropic.Comment: 8 pages, 9 figure
Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
We report on muon spin relaxation measurements of the 4f^2-based
heavy-fermion superconductor filled-skutterudite PrOs4Sb12. The results reveal
the spontaneous appearance of static internal magnetic fields below the
superconducting transition temperature, providing unambiguous evidence for the
breaking of time-reversal symmetry in the superconducting state. A discussion
is made on which of the spin or orbital component of Cooper pairs carries a
nonzero momentum.Comment: 5 pages with 3 figure
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