550 research outputs found
Development of Surrogate Hand for Impact Tests
Despite continuous advancements in technology and safety procedures, hand injuries are still a significant problem in many industries. Metacarpal gloves are often used by workers to protect their hands against impacts, cuts, and other hazards. Importantly, testing the level of impact protection offered by different designs of metacarpal gloves cannot be done with living subjects. This limitation requires the use of a surrogate hand which can be used consistently and systematically in controlled impact tests. This work focuses on the development of a surrogate hand which can be manufactured and used for this purpose. The surrogate hand developed in this work is comprised of a bone structure and a flexible synthetic gel material, and the hand design is based on digital models obtained through laser scanning of bone and hand shapes. These digital models were scaled and assembled using a mesh editing software to generate a representative hand with the required size and posture. The resulting hand model was materialized with a 3D-printed bone structure surrounded by synthetic gel with shape, proportions, and flexibility resembling that of an actual hand
Evolution of crystalline electric field effects, superconductivity, and heavy fermion behavior in the specific heat of Pr(OsRu)Sb
Specific heat measurements were made on single crystals of the
superconducting filled skutterudite series Pr(OsRu)Sb
down to 0.6 K. Crystalline electric field fits in the normal state produced
parameters which were in agreement with previous measurements. Bulk
superconductivity was observed for all values of the Ru concentration with
transition temperatures consistent with previous experiments, confirming a
minimum in at . The data below appear to be more
consistent with power law behavior for (PrOsSb), and with
exponential behavior for . An enhanced electronic
specific heat coefficient was observed for , further
supporting as a critical concentration where the physical
properties abruptly change. Significant enhancement of above
the weak coupling value was only observed for and .Comment: 16 pages, 5 figures, submitted to Physical Review B. v2: text added
and figures modifie
Assessment of the U and Co magnetic moments in UCoGe by X-ray magnetic circular dichroism
The ferromagnetic superconductor UCoGe has been investigated by high field
X-ray magnetic circular dichroism (XMCD) at the U-M and Co/Ge-K edges.
The analysis of the branching ratio and XMCD at the U-M edges reveals
that the U-5 electrons count is close to 3. The orbital ()
and spin () moments of U at 2.1K and 17T (H//c) have been
determined. Their ratio () suggests a significant delocalization of
the 5 electron states. The similar field dependences of the local U/Co and
the macroscopic magnetization indicate that the Co moment is induced by the U
moment. The XMCD at the Co/Ge-K edges reveal the presence of small Co-4 and
Ge-4 orbital moments parallel to the macroscopic magnetization. In addition,
the Co-3 moment is estimated to be at most of the order of 0.1 at
17T. Our results rule out the possibility of an unusual polarisability of the U
and Co moments as well as their antiparallel coupling. We conclude that the
magnetism which mediates the superconductivity in UCoGe is driven by U.Comment: 4 figures + supplementary materia
Hidden Consequences: Examining the Impact of NIL on Athlete Well-Being
With the NCAA\u27s NIL policy changes, many athletes will likely need to solve the issue of brand management, with many of them assuming the role themselves. Taking on this role will likely lead to even more investment in their athlete identity (i.e., role engulfment), which has negative consequences for the athlete (Hatteberg, 2020). Guided by the literature on role engulfment, this article investigates the hidden effects NIL may have on collegiate athletes and their well-being, along with various branding and legal implications
Pressure induced effects on the Fermi surface of superconducting 2H-NbSe
The pressure dependence of the critical temperature and upper critical
field has been measured up to 19 GPa in the layered superconducting
material 2H-NbSe. Relating the behavior of to Fermi surface
parameters, we find that the electron phonon coupling of the 2D Nb 4d derived
bands shows a peak at 5 GPa when the charge density wave (CDW) order is
suppressed. On the other hand, shows a bell shaped curve with a
maximum at 10.5 GPa, well above the pressure for the suppression of the CDW
order. Changes in the band structure produce this shift in the maximum of
, demonstrating that 2H-NbSe shows important differences with
respect to other compounds where has a maximum in the temperature-density
phase diagram shaped by the suppression of another, non-superconducting, ground
state.Comment: 5 pages, 4 figures. Small changes in discussion. Typos correcte
Magnetic field dependence of the density of states in the multiband superconductor -BiPd
We present very low temperature scanning tunneling microscopy (STM)
experiments on single crystalline samples of the superconductor
-BiPd. We find a single fully isotropic superconducting gap.
However, the magnetic field dependence of the intervortex density of states is
higher than the one expected in a single gap superconductor, and the hexagonal
vortex lattice is locked to the square atomic lattice. Such increase in the
intervortex density of states and vortex lattice locking have been found in
superconductors with multiple superconducting gaps and anisotropic Fermi
surfaces. We compare the upper critical field obtained in our
sample with previous measurements and explain available data within multiband
supercondutivity. We propose that -BiPd is a single gap multiband
superconductor. We anticipate that single gap multiband superconductivity can
occur in other compounds with complex Fermi surfaces.Comment: 8 pages, 7 figure
- …