69 research outputs found
Effect of Environmental Conditioning on the Properties of Thermosetting and Thermoplastic-Matrix Composite Materials by Resin Infusion for Marine Applications (PREPRINT)
Glass-fibre reinforced polymer (GFRP) laminates were manufactured using Vacuum assisted Resin Transfer Moulding (VaRTM) with a range of thermosetting resins and a novel infusible thermoplastic resin as part of a comprehensive down-selection to identify suitable commercially available resin systems for the manufacture of marine vessels greater than 50 m in length. The effect of immersion in deionised water and in an organic liquid (diesel) on the interlaminar shear strength (ILSS) and glass transition temperature (Tg) was determined. The thermoplastic had the highest Tg of all materials tested and comparable ILSS properties to the epoxy. Immersion in water, however, caused larger reductions in ILSS properties of the thermoplastic compared to the other systems. SEM showed a transition from matrix-dominated failure in the dry condition to failure at the fibre-matrix interface in the wet and organic-wet specimens. The overall performance of the infusible thermoplastic is good when compared to well-established marine resin systems; however, the environmental performance could be improved if the thermoplastic resin is used in conjunction with a fibre sizing that is tailored for use with acrylic-based resin systems
Corpuscular model of two-beam interference and double-slit experiments with single photons
We introduce an event-based corpuscular simulation model that reproduces the
wave mechanical results of single-photon double slit and two-beam interference
experiments and (of a one-to-one copy of an experimental realization) of a
single-photon interference experiment with a Fresnel biprism. The simulation
comprises models that capture the essential features of the apparatuses used in
the experiment, including the single-photon detectors recording individual
detector clicks. We demonstrate that incorporating in the detector model,
simple and minimalistic processes mimicking the memory and threshold behavior
of single-photon detectors is sufficient to produce multipath interference
patterns. These multipath interference patterns are built up by individual
particles taking one single path to the detector where they arrive one-by-one.
The particles in our model are not corpuscular in the standard, classical
physics sense in that they are information carriers that exchange information
with the apparatuses of the experimental set-up. The interference pattern is
the final, collective outcome of the information exchanges of many particles
with these apparatuses. The interference patterns are produced without making
reference to the solution of a wave equation and without introducing signalling
or non-local interactions between the particles or between different detection
points on the detector screen.Comment: Accepted for publication in J. Phys. Soc. Jpn
Target Detection Performance Bounds in Compressive Imaging
This paper describes computationally efficient approaches and associated
theoretical performance guarantees for the detection of known targets and
anomalies from few projection measurements of the underlying signals. The
proposed approaches accommodate signals of different strengths contaminated by
a colored Gaussian background, and perform detection without reconstructing the
underlying signals from the observations. The theoretical performance bounds of
the target detector highlight fundamental tradeoffs among the number of
measurements collected, amount of background signal present, signal-to-noise
ratio, and similarity among potential targets coming from a known dictionary.
The anomaly detector is designed to control the number of false discoveries.
The proposed approach does not depend on a known sparse representation of
targets; rather, the theoretical performance bounds exploit the structure of a
known dictionary of targets and the distance preservation property of the
measurement matrix. Simulation experiments illustrate the practicality and
effectiveness of the proposed approaches.Comment: Submitted to the EURASIP Journal on Advances in Signal Processin
Poly Aryl Ether Ketones (PAEKs) and carbon-reinforced PAEK powders for laser sintering
Gut mucosal DAMPs in IBD: From mechanisms to therapeutic implications
Endogenous damage-associated molecular patterns (DAMPs) are released during tissue damage and have increasingly recognized roles in the etiology of many human diseases. The inflammatory bowel diseases (IBD), ulcerative colitis (UC) and Crohn’s disease (CD), are immune-mediated conditions where high levels of DAMPs are observed. DAMPs such as calprotectin (S100A8/9) have an established clinical role as a biomarker in IBD. In this review, we use IBD as an archetypal common chronic inflammatory disease to focus on the conceptual and evidential importance of DAMPs in pathogenesis and why DAMPs represent an entirely new class of targets for clinical translation. </p
Signal Processing for NDE
Nowadays, testing and evaluating of industrial equipment using nondestructive tests, is a
fundamental step in the manufacturing process. The complexity and high costs of manufacturing
industrial components, require examinations in some way about the quality and reliability of the
specimens. However, it should be noted, that in order to accurately perform the nondestructive
test, in addition to theoretical knowledge, it is also essential to have the experience and carefulness,
which requires special courses and experience with theoretical education. Therefore, in the
traditional methods, which are based on manual testing techniques and the test results depend on
the operator, there is the possibility of an invalid inference from the test data. In other words, the
accuracy of conclusion from the obtained data is dependent on the skill and experience of the
operator. Thus, using the signal processing techniques for nondestructive evaluation (NDE), it is
possible to optimize the methods of nondestructive inspection, and in other words, to improve the
overall system performance, in terms of reliability and system implementation costs.
In recent years, intelligent signal processing techniques have had a significant impact on the
progress of nondestructive assessment. In other words, by automating the processing of
nondestructive data and signals, and using the artificial intelligence methods, it is possible to
optimize nondestructive inspection methods. Hence, improve overall system performance in terms
of reliability and Implementation costs of the system. This chapter reviews the issues of intelligent
processing of nondestructive testing (NDT) signals
Design of a fuzzy system for living space thermal-comfort regulation
The present paper describes the design of a living space comfort regulator using fuzzy logic. Comfort is a fuzzy concept, different for different people and depending on the work done in the space. The paper describes the structure of the system, the available measurements and the available actuators, the measurement fuzzification process and the defuzzification method. Particular attention is paid to the proper selection of the rules in the knowledge base and the design of the inference engine. Finally the system is tested, and shows satisfactory performance. General design guidelines are given, including the case of spaces having different actuators.Fuzzy logic control Fuzzy thermal comfort Expert system Thermal comfort regulation Fuzzy system
Novel L-DOPA-derived poly(ester amide)s : monomers, polymers and the first L-DOPA-functionalized bio-based adhesive tape
The synthesis, characterization, and testing of a range of novel bio-inspired L-DOPA-derived poly(ester amide)s is presented, using a widely applicable, straightforward chemistry. A model system is used to study and establish the monomer and polymer synthetic protocols, and to provide a set of optimum reaction conditions. It is further shown that fully biobased L-DOPA-containing adhesive tapes can be fabricated, which are positively evaluated in terms of their adhesive properties. The newly developed synthetic protocol constitutes a versatile platform for accessing and tailoring a plethora of relevant structures, including a variety of potentially biocompatible poly(ethylene glycol)-based materials
S24 LATE COMPLICATIONS OF PHOTOSELECTIVE VAPORIZATION OF THE PROSTATE WITH THE 80-W POTASSIUM-TITANYL-PHOSPHATE LASER. IS THERE SUFFICIENT EVIDENCE?
Anomaly Target Detection in Hyperspectral Imagery Based on Band Subset Fusion by Fuzzy Integral
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