1,084 research outputs found
AC Loss and Contact Resistance In Copper-Stabilized Nb3Al Rutherford Cables with and without a Stainless Steel Core
Calorimetric measurements of AC loss and hence interstrand contact resistance
(ICR), were measured on three samples of Rutherford cable wound with
Cu-stabilized jelly-roll type unplated Nb3Al strand. One of the cable types was
furnished with a thin core of AISI 316L stainless steel and the other two were
both uncored but insulated in different ways. The cables were subjected to a
room-temperature-applied uniaxial pressure of 12 MPa that was maintained during
the reaction heat treatment (RHT), then vacuum impregnated with CTD 101 epoxy,
and repressurized to 100 MPa during AC-loss measurement. The measurements were
performed at 4.2 K in a sinusoidal field of amplitude 400 mT at frequencies of
1 to 90 mHz (no DC-bias field) that was applied both perpendicular and parallel
to the face of the cable (the face-on, FO, and edge-on, EO, directions,
respectively). For the cored cable the FO-measured effective ICR (FO-ICR), was
5.27 . Those for the uncored cables were less than 0.08
. As shown previously for NbTi- and Nb3Sn-based Rutherford
cables, the FO-ICR can be significantly increased by the insertion of a core,
although in this case it is still below the range recommended for
accelerator-magnet use. Post-measurement dissection of one of the cables showed
that the impregnating resin had permeated between the strands and coated the
core with a thin, insulating layer excepting for some sintered points of
contact. In the uncored cables the strands were coated with resin except for
the points of interstrand contact. It is suggested that in the latter case this
tendency for partial coating leads to a processing-sensitive FO-ICR.Comment: Four pages, with two figure
Evaporation of ices near massive stars: models based on laboratory TPD data
Hot cores and their precursors contain an integrated record of the physics of
the collapse process in the chemistry of the ices deposited during that
collapse. In this paper, we present results from a new model of the chemistry
near high mass stars in which the desorption of each species in the ice mixture
is described as indicated by new experimental results obtained under conditions
similar to those hot cores. Our models show that provided there is a monotonic
increase in the temperature of the gas and dust surrounding the protostar, the
changes in the chemical evolution of each species due to differential
desorption are important. The species HS, SO, SO, OCS, HCS, CS, NS,
CHOH, HCOOCH, CHCO, CHOH show a strong time dependence that
may be a useful signature of time evolution in the warm-up phase as the star
moves on to the Main Sequence. This preliminary study demonstrates the
consequences of incorporating reliable TPD data into chemical models.Comment: 5 pages, accepted by MNRA
Thermal Desorption of Water-Ice in the Interstellar Medium
Water (H2O) ice is an important solid constituent of many astrophysical
environments. To comprehend the role of such ices in the chemistry and
evolution of dense molecular clouds and comets, it is necessary to understand
the freeze-out, potential surface reactivity, and desorption mechanisms of such
molecular systems. Consequently, there is a real need from within the
astronomical modelling community for accurate empirical molecular data
pertaining to these processes. Here we give the first results of a laboratory
programme to provide such data. Measurements of the thermal desorption of H2O
ice, under interstellar conditions, are presented. For ice deposited under
conditions that realistically mimic those in a dense molecular cloud, the
thermal desorption of thin films (~50 molecular layers) is found to occur with
zero order kinetics characterised by a surface binding energy, E_{des}, of 5773
+/- 60 K, and a pre-exponential factor, A, of 10^(30 +/- 2) molecules cm^-2
s^-1. These results imply that, in the dense interstellar medium, thermal
desorption of H2O ice will occur at significantly higher temperatures than has
previously been assumed.Comment: 9 pages, 4 figures, accepted for publication in MNRA
Born global networks: The role of connectors
The nature of born global firms which from inception, seek to derive
significant competitive advantage from the use of resources and the sales of
outputs in multiple countries remains poorly understood. Given the lack of
resources which born globals tend to have compared with larger international
competitors the importance of social capital and network ties in addressing
their liabilities of newness and smallness have received some attention.
However, how these network ties actually operate and the nuances inside of
these networks are as yet not fully understood. This paper seeks to address this
knowledge gap by attempting to unpack the black box of the social networks
and connectors which born globals draw upon in their internationalisation
efforts. Based on a study of the indigenous Irish digital, film and TV
production industry, our research points to a suite of both weak and strong
connectors which facilitate the internationalisation of the firms in our sample
Deposition And Drying Dynamics Of Liquid Crystal Droplets
Drop drying and deposition phenomena reveal a rich interplay of fundamental science and engineering, give rise to fascinating everyday effects (coffee rings), and influence technologies ranging from printing to genotyping. Here we investigate evaporation dynamics, morphology, and deposition patterns of drying lyotropic chromonic liquid crystal droplets. These drops differ from typical evaporating colloidal drops primarily due to their concentration-dependent isotropic, nematic, and columnar phases. Phase separation occurs during evaporation, and in the process creates surface tension gradients and significant density and viscosity variation within the droplet. As a result, the drying multiphase drops exhibit different convective currents, drop morphologies, and deposition patterns (coffee-rings)
Elasticity-Dependent Self-assembly of Micro-Templated Chromonic Liquid Crystal Films
We explore micropatterned director structures of aqueous lyotropic chromonic
liquid crystal (LCLC) films created on square lattice cylindrical-micropost
substrates. The structures are manipulated by modulating the LCLC mesophases
and their elastic properties via concentration through drying. Nematic LCLC
films exhibit preferred bistable alignment along the diagonals of the micropost
lattice. Columnar LCLC films, dried from nematics, form two distinct director
and defect configurations: a diagonally aligned director pattern with local
squares of defects, and an off-diagonal configuration with zig-zag defects. The
formation of these states appears to be tied to the relative splay and bend
free energy costs of the initial nematic films. The observed nematic and
columnar configurations are understood numerically using a Landau-de Gennes
free energy model. Among other attributes, the work provide first examples of
quasi-2D micropatterning of LC films in the columnar phase and lyotropic LC
films in general, and it demonstrates alignment and configuration switching of
typically difficult-to-align LCLC films via bulk elastic properties.Comment: 9 pages; 9 figures; accepted for publication in Soft Matte
Prospects for Improving the Intrinsic and Extrinsic Properties of Magnesium Diboride Superconducting Strands
The magnetic and transport properties of magnesium diboride films represent
performance goals yet to be attained by powder-processed bulk samples and
conductors. Such performance limits are still out of the reach of even the best
magnesium diboride magnet wire. In discussing the present status and prospects
for improving the performance of powder-based wire we focus attention on (1)
the intrinsic (intragrain) superconducting properties of magnesium diboride,
Hc2 and flux pinning, (2) factors that control the efficiency with which
current is transported from grain-to-grain in the conductor, an extrinsic
(intergrain) property. With regard to Item-(1), the role of dopants in Hc2
enhancement is discussed and examples presented. On the other hand their roles
in increasing Jc, both via Hc2 enhancement as well as direct
fluxoid/pining-center interaction, are discussed and a comprehensive survey of
Hc2 dopants and flux-pinning additives is presented. Current transport through
the powder-processed wire (an extrinsic property) is partially blocked by the
inherent granularity of the material itself and the chemical or other
properties of the intergrain surfaces. These and other such results indicate
that in many cases less than 15% of the conductor's cross sectional area is
able to carry transport current. It is pointed out that densification in
association with the elimination of grain-boundary blocking phases would yield
five-to ten-fold increases in Jc in relevant regimes, enabling the performance
of magnesium diboride in selected applications to compete with that of Nb-Sn
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