3,818 research outputs found
Attitude-referenced radiometer study. Part 2: Primary calibration system
A primary calibration system, PCS, for infrared radiometers has been developed, built, and tested. The system allows radiometers to be calibrated with less than 1 percent error for use in earth coverage horizon measurements, earth resources surveys, and synoptic meteorological measurement. The final design, fabrication and test of the PCS are reported. A detailed description of the PCS construction is presented, along with the results of a complete series of functional tests. Test to verify the source thermal characteristics, collimator reflectance, and output beam characteristics are described and their results presented
The hospital organization of the future
The future of hospital Nuclear Medicine is triggered by the hospital
organisation itself. In general, the hospital organisation of
the present requires substantial changes in order to be competitive,
economical, and abreast of the rapid progresses in
medical developments and patient management. It also must
be flexible to changes in health politics. In this special report an
organisational hospital structure is outlined which may help
encounter the challenging hospital future. Some hospitals have
already implemented convincing changes, whereas others are
far behind
Status of Silicon Photomultiplier Developments as optical Sensors for MAGIC/EUSO like Detectors
Creating a registration database using Microsoft Access 97
Every business or organization that conducts any type of training, whether on a small or large scale, must deal with logistical issues. There are several ways of keeping track of relevant and important information, including anything from paper based systems to off the shelf computer applications. Very often, these methods are cumbersome or not applicable to the needs of the organization. This research project focuses on the customization of training registration information and logistics for a specific company, for the purposes of this paper called XXXX, using a database.
Specifically, a Microsoft Access database was created to keep track of the desired registration information, in a clear and easy to use format. The registration database keeps track of specific information on all employees, classes created, and the schedules for those employees scheduled to take training through company XXXX
Magneto-quantum oscillations of the conductance of a tunnel point-contact in the presence of a single defect
The influence of a quantizing magnetic field to the conductance of a
tunnel point contact in the presence of the single defect has been considered.
We demonstrate that the conductance exhibits specific magneto-quantum
oscillations, the amplitude and period of which depend on the distance between
the contact and the defect. We show that a non-monotonic dependence of the
point-contact conductance results from a superposition of two types of
oscillations: A short period oscillation arising from electron focusing by the
field and a long period oscillation of Aharonov-Bohm-type originated from
the magnetic flux passing through the closed trajectories of electrons moving
from the contact to the defect and returning back to the contact.Comment: 13 pages, 3 figure
Exploring the phase diagram of the two-impurity Kondo problem
A system of two exchange-coupled Kondo impurities in a magnetic field gives
rise to a rich phase space hosting a multitude of correlated phenomena.
Magnetic atoms on surfaces probed through scanning tunnelling microscopy
provide an excellent platform to investigate coupled impurities, but typical
high Kondo temperatures prevent field-dependent studies from being performed,
rendering large parts of the phase space inaccessible. We present an integral
study of pairs of Co atoms on insulating Cu2N/Cu(100), which each have a Kondo
temperature of only 2.6 K. In order to cover the different regions of the phase
space, the pairs are designed to have interaction strengths similar to the
Kondo temperature. By applying a sufficiently strong magnetic field, we are
able to access a new phase in which the two coupled impurities are
simultaneously screened. Comparison of differential conductance spectra taken
on the atoms to simulated curves, calculated using a third order transport
model, allows us to independently determine the degree of Kondo screening in
each phase.Comment: paper: 14 pages, 4 figures; supplementary: 3 pages, 1 figure, 1 tabl
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