1,467 research outputs found
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FDM® Technology Process Improvements
Since the introduction ofrapid prototyping technology as a tool for time compression and concurrent engineering in
the design and manufacturing process, many enhancements and refinements have been made based on the experience
of users and manufacturers of rapid prototyping equipment. These improvements contribute significantly to faster
production of quality output from rapid prototyping systems.
There are diverse control and material selection parameters that affect prototype models built using the Fused
Deposition Modeling (FDM®) process. This paper reviews the role of several of these parameters in the process.
Data will be presented to help the user choose the appropriate material for specific applications including density,
tensile modulus, flexural modulus, tensile strength, flexural strength, impact strength, and hardness.
The integration of material, hardware, and software in the FDM technology begins with the understanding of the
basic requirements ofthe machine and ends with an operating procedure to choose the parameters for optimal model
output and efficiency. Some of the variables include: part geometry, deposition geometry, deposition speed,
liquefier temperature, material, flow control parameters, etc. Designed experiments are used in material formulation
through modeling parameter defmition activitiesMechanical Engineerin
Weight management: lifestyle services for overweight or obese children and young people
This guideline covers lifestyle weight management services for children and young people aged under 18 who are overweight or obese. It advises how to deliver effective weight management programmes that support children and young people to change their lifestyle and manage their weight
Magneto-elastic coupling and competing entropy changes in substituted CoMnSi metamagnets
We use neutron diffraction, magnetometry and low temperature heat capacity to
probe giant magneto-elastic coupling in CoMnSi-based antiferromagnets and to
establish the origin of the entropy change that occurs at the metamagnetic
transition in such compounds. We find a large difference between the electronic
density of states of the antiferromagnetic and high magnetisation states. The
magnetic field-induced entropy change is composed of this contribution and a
significant counteracting lattice component, deduced from the presence of
negative magnetostriction. In calculating the electronic entropy change, we
note the importance of using an accurate model of the electronic density of
states, which here varies rapidly close to the Fermi energy.Comment: 11 pages, 9 figures. Figures 4 and 6 were updated in v2 of this
preprint. In v3, figures 1 and 2 have been updated, while Table II and the
abstract have been extended. In v4, Table I has updated with relevant neutron
diffraction dat
Translational Research from an Informatics Perspective
Clinical and translational research (CTR) is an essential part of a sustainable global health system. Informatics is now recognized as an important en-abler of CTR and informaticians are increasingly called upon to help CTR efforts. The US National Institutes of Health mandated biomedical informatics activity as part of its new national CTR grant initiative, the Clinical and Translational Science Award (CTSA). Traditionally, translational re-search was defined as the translation of laboratory discoveries to patient care (bench to bedside). We argue, however, that there are many other kinds of translational research. Indeed, translational re-search requires the translation of knowledge dis-covered in one domain to another domain and is therefore an information-based activity. In this panel, we will expand upon this view of translational research and present three different examples of translation to illustrate the point: 1) bench to bedside, 2) Earth to space and 3) academia to community. We will conclude with a discussion of our local translational research efforts that draw on each of the three examples
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Turbine-engine applications of thermographic-phosphor temperature measurements
The thermographic-phosphor (TP) method can measure temperature, heat flux, strain, and other physical quantities remotely in hostile and/or inaccessible environments such as the first-stage turbine components in turbine engines. It is especially useful in situations in which no other known method works well. This paper is a brief review of engine tests that demonstrated the utility of the TP method. For the most part, the results presented here are discussed only qualitatively. The papers in the bibliography describe these and other experiments and results in detail. The first viewgraph summarizes the many desirable features of the TP method. The second viewgraph describes TPs, and the third summarizes how the TP method works. To measure single-point temperatures in turbine-engine applications, we use the decay-time method, which depends on the fact that the luminescence following an impulse of ultraviolet excitation decays, with a characteristic decay time that. Is a monotonically decreasing function of temperature over some range of temperatures. The viewgraph is a set of calibration curves showing the behavior of some useful emission lines for ten important TPs. Consider Lu PO{sub 4}:Eu as an example. Below the {open_quotes}quenching{close_quotes} temperature near 900 Y, the decay time is nearly constant. Above it, the decay time decreases exponentially with the temperature. This strong functional dependence means that one can have a fairly large error in the lifetime measurement, as in environments with poor signal-to-noise ratios (SNRs), yet still obtain high accuracy in the temperature measurement. Our more-recent data up to 1900 K show the same behavior
Big Data and Changes in Audit Technology: Contemplating a Research Agenda
This study explores the most recent episode in the evolution of audit technology, namely the incorporation of Big Data and Data Analytics (BDA) into audit firm approaches. Drawing on 22 interviews with individuals with significant experience in developing, implementing or assessing the impact of BDA in auditing, together with publicly available documents on BDA published within the audit field, the paper provides a holistic overview of BDA-related changes in audit practice. In particular, the paper focuses on three key aspects, namely the impact of BDA on the nature of the relationship between auditors and their clients; the consequences of the technology for the conduct of audit engagements and the common challenges associated with embedding BDA in the audit context. The study’s empirical findings are then used to establish an agenda of areas suitable for further research on the topic. The study is one of the first empirical accounts providing a perspective on the rise of BDA in auditing
Electronic and Vibrational Properties of gamma-AlH3
Aluminum hydride (alane) AlH_3 is an important material in hydrogen storage
applications. It is known that AlH_3 exists in multiply forms of polymorphs,
where -AlH_3 is found to be the most stable with a hexagonal structure.
Recent experimental studies on -AlH_3 reported an orthorhombic
structure with a unique double-bridge bond between certain Al and H atoms. This
was not found in -AlH_3 or other polymorphs. Using density functional
theory, we have investigated the energetics, and the structural, electronic,
and phonon vibrational properties for the newly reported -AlH_3
structure. The current calculation concludes that -AlH_3 is less stable
than -AlH_3 by 2.1 KJ/mol. Interesting binding features associated with
the unique geometry of -AlH3 are discussed from the calculated
electronic properties and phonon vibrational modes. The binding of H-s with
higher energy Al-p,d orbitals is enhanced within the double-bridge arrangement,
giving rise to a higher electronic energy for the system. Distinguishable new
features in the vibrational spectrum of -AlH_3 were attributed to the
double-bridge and hexagonal-ring structures.Comment: 18 pages, 9 figures, submited to PR
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