1,629,686 research outputs found
Empirical Analysis of Chirp and Multitones Performances with a UWB Software Defined Radar: Range, Distance and Doppler
In this study, a protocol for an unbiased analysis of radar signals' performance. Using a novel UWB software-defined radar, range profile, Doppler profile and detection range are evaluated for both Linear Frequency Modulated pulse and Multitones. The radar was prototyped and is comparable in overall performance to software defined radar test-beds found in the literature. The measured performance was in agreement with the simulations
Case studies of outdoor testing and analysis of building components
The construction and development of the PASSYS/PASLINK outdoor test cells were funded by the European Commission, with the objective of providing high-quality test environments for quantifying the performance of passive solar building components. Over the years since the original test cells were commissioned, the initial concept for outdoor testing has been extended to include other test cell types. Significant improvements have been made to the experimental procedures and analysis techniques, and a broad range of components has been tested. This paper describes representative experiments that have been conducted using these highly controlled outdoor test environments, indicates some of the related analysis, and shows the type of information that can be obtained from such tests. It demonstrates the way in which component performance can be ascertained in the realistic external environment. The case studies chosen range from building component tests within EC research projects to commercial tests, and from conventional building components to novel integrated facade systems. They also include a large range of passive and active components. Each case study summarises the test component, the purpose of the test, details of the test configuration (period of test, instrumentation, etc.), results and analysis, and associated modelling and monitoring where appropriate. The paper concludes with an appraisal of the advantages and limitations of the test cells for the various component types
Resin transfer moulding: Novel fabrics and tow placement techniques in highly loaded carbon fibre composite aircraft spars
A BAE Systems /UK EPSRC funded project Flaviir, is investigating the design and
manufacture of low cost carbon fibre composite airframe structures. Novel binder
coated unidirectional fibre tapes and tows were developed to enable the design
of optimised primary structures. The RTM technique was applied to mould net
shape sections of spar components. Various designs of wing attachment lugs were
manufactured with a range of reinforcement materials, including non crimp
fabric, novel binder coated tapes and conventional unidirectional prepreg.
Alongside these, a novel technique termed optimised tow lay up (OTL) was used to
reduce the weight. Binder coated carbon fibre tow is placed around the structure
in the principal stress directions to increase both bearing strength and overall
component stiffness. The novel materials, manufacturing technique and initial
element test results are presented
Performance of a C4F8O Gas Radiator Ring Imaging Cherenkov Detector Using Multi-anode Photomultiplier Tubes
We report on test results of a novel ring imaging Cherenkov (RICH) detection
system consisting of a 3 meter long gaseous C4F8O radiator, a focusing mirror,
and a photon detector array based on Hamamatsu multi-anode photomultiplier
tubes. This system was developed to identify charged particles in the momentum
range from 3-70 GeV/c for the BTeV experiment.Comment: 28 pages, 23 figures, submitted to Nuclear Instruments and Method
A novel computerized test for detecting and monitoring visual attentional deficits and delirium in the ICU
Objectives: Delirium in the ICU is associated with poor outcomes
but is under-detected. Here we evaluated performance of a novel,
graded test for objectively detecting inattention in delirium, implemented
on a custom-built computerized device (Edinburgh Delirium
Test BoxâICU).
Design: A pilot study was conducted, followed by a prospective
case-control study.
Setting: Royal Infirmary of Edinburgh General ICU.
Patients: A pilot study was conducted in an opportunistic sample
of 20 patients. This was followed by a validation study in
30 selected patients with and without delirium (median age,
63 yr; range, 23â84) who were assessed with the Edinburgh
Delirium Test BoxâICU on up to 5 separate days. Presence
of delirium was assessed using the Confusion Assessment
Method for the ICU.
Measurements and Main Results: The Edinburgh Delirium Test
BoxâICU involves a behavioral assessment and a computerized
test of attention, requiring patients to count slowly presented
lights. Thirty patients were assessed a total of 79 times (n = 31, 23,
15, 8, and 2 for subsequent assessments; 38% delirious). Edinburgh
Delirium Test BoxâICU scores (range, 0â11) were lower
for patients with delirium than those without at the first (median, 0
vs 9.5), second (median, 3.5 vs 9), and third (median, 0 vs 10.5)
assessments (all p < 0.001). An Edinburgh Delirium Test BoxâICU
score less than or equal to 5 was 100% sensitive and 92% specific
to delirium across assessments. Longitudinally, participantsâ
Edinburgh Delirium Test BoxâICU performance was associated
with delirium status.
Conclusions: These findings suggest that the Edinburgh Delirium
Test BoxâICU has diagnostic utility in detecting ICU delirium
in patients with Richmond Agitation and Sedation Scale Score
greater than â3. The Edinburgh Delirium Test BoxâICU has potential
additional value in longitudinally tracking attentional deficits
because it provides a range of scores and is sensitive to change
Refractometry of organosilica microspheres
The refractive index of novel organosilica (nano/micro)material is determined
using two methods. The first method is based on analysis of optical extinction
efficiency of organosilica beads versus wavelength, which is obtained by a
standard laboratory spectrometer. The second method relies on the measurable
trapping potential of these beads in the focused light beam (laser tweezers).
Polystyrene beads were used to test these methods, and the determined
dispersion curves of refractive index values have been found accurate. The
refractive index of organosilica beads has been determined to range from
1.60-1.51 over the wavelength range of 300-1100 nm.Comment: 9 pages, 8 figure
Preface to the special issue on "recent developments and new directions in thin-film flow"
Thin ďŹlms of ďŹuids are of central importance in numerous industrial, biomedical, geophysical and domestic applications, and display a rich and varied range of behaviours, including pattern formation, dewetting, rupture and ďŹnite-time blow up. As well as being of great interest in their own right, thin-ďŹlm ďŹows provide a âtest bedâ for research into a variety of challenging nonlinear problems in engineering, physics, chemistry, biology, and mathematics. As a consequence, research by a wide range of scientists, using a variety of analytical, numerical and experimental techniques on many different aspects of thin-ďŹlm ďŹow, has grown significantly in recent years, as novel applications have continued to appear and increasingly sophisticated theoretical and experimental techniques have been developed
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