9,220 research outputs found
A Ballistic Graphene Cooper Pair Splitter
We report an experimental study of Cooper pair splitting in an encapsulated
graphene based multiterminal junction in the ballistic transport regime. Our
device consists of two transverse junctions, namely the
superconductor/graphene/superconductor and the normal metal/graphene/normal
metal junctions. In this case, the electronic transport through one junction
can be tuned by an applied bias along the other. We observe clear signatures of
Cooper pair splitting in the local as well as nonlocal electronic transport
measurements. Our experimental data can be very well described by using a
modified Octavio-Tinkham-Blonder-Klapwijk model and a three-terminal beam
splitter model
Critical Evaluation and Compilation of Viscosity and Diffusivity Data Semiannual Status Report No. 1, Jul. 1 - Dec. 31, 1965
Compilation and evaluation of diffusivity and viscosity data on gas and liquid turbulent flow system
Compton processes in the bright AGN MCG+8-11-11
We present preliminary results on the hard X-ray emission properties of the
Seyfert 1.5 galaxy MCG+8-11-11 as observed by INTEGRAL and SWIFT. All the
INTEGRAL IBIS/ISGRI data available up to October 2009 have been analyzed
together with two SWIFT/XRT snapshot observations performed in August and
October 2009, quasi-simultaneously to INTEGRAL pointed observations of
MCG+8-11-11. No correlation is observed between the hard X-ray flux and the
spectral slope, while the position of the high-energy cut-off is found to have
varied during the INTEGRAL observations. This points to a change in the
temperature of the Comptonising medium from a minimum value of kT = 30-50 keV
to values larger than 100-150 keV. There is no significant detection of Compton
reflection, with a 3 sigma upper limit of R < 0.2, and no line has been
detected at 112 keV, as previously claimed from HEAT observations (112 keV flux
F < 2.4e-4 ph/cm^2/s). The variability behaviour of MCG+8-11-11 is found to be
similar to that shown by IC 4329A, with different temperatures of the electron
plasma for similar flux levels of the source, while other bright Seyfert
galaxies present different variability patterns at hard X-rays, with spectral
changes correlated to flux variations (e.g. NGC 4151).Comment: 6 pages, 4 figures. Accepted for publication on PoS (contribution
PoS(INTEGRAL 2010)077), proceedings of the 8th INTEGRAL Workshop "The
Restless Gamma-ray Universe" (September 2010, Dublin, Ireland
Water rights, conflict and policy: Proceedings of a workshop held in Kathmandu, Nepal, January 22-24, 1996
IrrigationIrrigation managementWater rightsWater lawConflictFarmers' associations
Computer Simulation of Tooth Mobility using Varying Material Properties
Tooth mobility is the major cause of stress on a tooth implant or partial denture and often results in the damage of the device. For many prosthetic devices like dental bridges, a partial denture used for a person who is missing a tooth to give the appearance and function of a tooth, mobility can cause up to double the amount of stress in comparison to a fixed model. Creating a computer simulation of tooth mobility using Finite Element Analysis allows one to understand and predict this movement in order to improve future dental prosthetic devices. The main cause of tooth mobility within the mouth is the periodontal ligament (PDL). This ligament is a soft biological tissue that surrounds the roots of teeth. The tooth moves when a force like mastication, or chewing, causes the ligament to deform. This deformation is due to the small Young’s Modulus of the ligament. The Young’s Modulus determines the stiffness of a material. In the case of the PDL, the Young’s Modulus is sometimes noted to be 30,000 times smaller than that of dentin, this is the material that makes up the majority of the tooth, and of the alveolar bone, this is the bone in which the tooth lies. The deformation of the PDL is also due to the viscoelastic nature of the ligament. The major elastic component of the ligament is collagen, this material allows the PDL to stretch to a certain limit, and the major viscous component of the ligament is the interstitial fluid between the cells, this allows the material to have a fluid-like nature (4)
The Australian Incident Monitoring Study in Intensive Care: AIMS-ICU. The development and evaluation of an incident reporting system in intensive care
Publisher's copy made available with the permission of the publisher © 1996 Australian Society of AnaesthetistsIntensive care units are complex, dynamic patient management environments. Incidents and accidents can be caused by human error, by problems inherent in complex systems, or by a combination of these. Study objectives were to develop and evaluate an incident reporting system. A report form was designed eliciting a description of the incident, contextual information and contributing factors. Staff group sessions using open-ended questions, observations in the workplace and a review of earlier narratives were used to develop the report form. Three intensive care units participated in a two-month evaluation study. Feedback questionnaires were used to assess staff attitudes and understanding, project design and organization. These demonstrated a positive attitude and good understanding by more than 90% participants. Errors in communication, technique, problem recognition and charting were the predisposing factors most commonly chosen in the 128 incidents reported. It was concluded that incident monitoring may be a suitable technique for improving patient safety in intensive care.U. Beckman, L.F. West, G.J. Groombridge, I. Baldwin, G.K. Hart, D.G. Clayton, R.K. Webb, W.B. Runcima
Study of storm weather situations in observation and ECHAM3/T42 model simulation
In this paper, we provide an estimation of the seasonal distribution of strong wind and storm weather situations in an ECHAM3/T42 climate model simulation in relation to observed conditions. Observational data of the German Eight and the southern Baltic Sea are taken to compare observations and climate model simulation. The results of the study show significant differences in the seasonal Frequency of occurrence for strong wind and storm weather situations between simulation and observations. A new objective classification routine for detecting single strong wind and storm weather situations (Bft 7 and more) in coarse resolution models is used to validate the large-scale parameters of those events in the climate simulation. The objective classification routine is able to detect strong wind and storm weather situations of two flow regimes in the German Eight in winter. The routine is applied to the ECMWF Re-Analysis (T42 resolution) and to a climate simulation of the northern Hemisphere, which was performed with the ECHAM3/T42. It is shown that the large-scale parameters of single strong wind and storm weather situations are simulated quire realistically in the ECHAM3/T42
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