113 research outputs found
Bent crystal spectrometer for both frequency and wavenumber resolved x-ray scattering at a seeded free-electron laser
We present a cylindrically curved GaAs x-ray spectrometer with energy
resolution and wave-number resolution of
, allowing plasmon scattering at the resolution
limits of the Linac Coherent Light Source (LCLS) x-ray free-electron laser. It
spans scattering wavenumbers of 3.6 to \AA\ in 100 separate bins, with
only 0.34\% wavenumber blurring. The dispersion of 0.418~eV/m agrees
with predictions within 1.3\%. The reflection homogeneity over the entire
wavenumber range was measured and used to normalize the amplitude of scattering
spectra. The proposed spectrometer is superior to a mosaic HAPG spectrometer
when the energy resolution needs to be comparable to the LCLS seeded bandwidth
of 1~eV and a significant range of wavenumbers must be covered in one exposure
The First Brown Dwarf Discovered by the Backyard Worlds: Planet 9 Citizen Science Project
The Wide-field Infrared Survey Explorer (WISE) is a powerful tool for finding
nearby brown dwarfs and searching for new planets in the outer solar system,
especially with the incorporation of NEOWISE and NEOWISE-Reactivation data. So
far, searches for brown dwarfs in WISE data have yet to take advantage of the
full depth of the WISE images. To efficiently search this unexplored space via
visual inspection, we have launched a new citizen science project, called
"Backyard Worlds: Planet 9," which asks volunteers to examine short animations
composed of difference images constructed from time-resolved WISE coadds. We
report the discovery of the first new substellar object found by this project,
WISEA J110125.95+540052.8, a T5.5 brown dwarf located approximately 34 pc from
the Sun with a total proper motion of 0.7 as yr. WISEA
J110125.95+540052.8 has a WISE magnitude of , this
discovery demonstrates the ability of citizen scientists to identify moving
objects via visual inspection that are 0.9 magnitudes fainter than the
single-exposure sensitivity, a threshold that has limited prior motion-based
brown dwarf searches with WISE.Comment: 9 pages, 4 figures, 1 table. Accepted for publication in the
Astrophysical Journal Letter
Modelling environment for holistic vehicle simulation
As the complexity of road vehicles increases with time, the importance of CAE
tools to the product development cycle increases as well. A holistic vehicle simulation
capability is necessary for front-loading component, subsystem, and controller design, for the
early detection of component and subsystem design flaws, as well as for the model-based
calibration of powertrain control modules. The current document explores the concept of
holistic vehicle simulation by means of developing and testing a Simulink-based multidisciplinary modelling environment (MME), modular in nature and capable of connecting to
subsystem models developed in different environments, thus supporting holistic vehicle
simulation on a company-wide scale. The developed environment is tested via the integration
of subsystem models built in different commercial software packages within the environment.
The simulation results generated from equivalent vehicle models developed in three
competing platforms are compared and the advantages and limitations of the different
methods of model integration to the master holistic vehicle simulation are discussed
Automated model based engine calibration procedure using co-simulation
The final validation and sign-off of a production powertrain control module (PCM)
calibration is a time-consuming and expensive task and requires a high degree of expertise. There are
two main reasons for this; firstly, the validation test is an iterative process due to the fact that
calibration changes may affect the true operating point of the engine at the desired test point.
Secondly, modifications to the calibration require expert knowledge of the complete control strategy
so as to improve the correlation to validation data without potentially negatively impacting the
correlated mapping points. This paper describes the implementation of an optimisation routine on a
virtual platform in order to both reduce the requirement for experimental testing during the validation
procedure, and for development of the optimisation routine itself prior to execution on the engine
dynamometer. It is shown that in simulation, the optimisation routine is capable of producing an
acceptable calibration within just 5 iterations, reducing the 11-week process down to just a few days.
It is also concluded that there are also a number of further improvements that could be made to further
improve the efficiency of this process
Changing Student Attitudes Toward Interprofessional Learning and Collaboration: Partnering with Healthcare Mentors in the Academic Setting
Healthcare Mentor Project Individuals with one or more chronic health conditions Share their time with students Help students understand how to provide effective care Participation helps to make learning more authenti
Developing the Enquiring Student and Enhancing the Research-Teaching Interface: Student-led Pedagogical Research and Educational Initiatives in Enquiry Based Learning
This paper describes the progress of a project running at the University of Glasgow to develop elements of Enquiry Based Learning (EBL) in undergraduate degree courses across a range of disciplines. It focuses on the second part of the project but an overview of the first part is also given. During phase 1 of the project, in the summer of 2007, seven undergraduate students spent four weeks working together exploring enquiry based learning (EBL) in the institution’s central, educational development unit. This phase was approached as an EBL exercise itself; the student groups were given full responsibility for the process with the proviso that by the end of this phase they would have developed a guide for staff and students about EBL. The second phase of the project continues throughout the academic year 07/08. Here, each student worked alongside a member of staff from their department of study to develop discipline specific EBL activities taking a research-informed approach to this development. All pairings were charged with introducing EBL such that no major course change procedures had to be followed; this hopefully ensured the sustainability of such adjustments. Staff and students involved in the project represent dentistry, chemistry, biology, theology, law and psychology and the courses under development range from large first year classes to small honours level courses. An overview of the range of enquiry-based learning developments within the courses will be described
Developing the Enquiring Student and Enhancing the Research-Teaching Interface: Student-led Pedagogical Research and Educational Initiatives in Enquiry Based Learning
This paper describes the progress of a project running at the University of Glasgow to develop elements of Enquiry Based Learning (EBL) in undergraduate degree courses across a range of disciplines. It focuses on the second part of the project but an overview of the first part is also given. During phase 1 of the project, in the summer of 2007, seven undergraduate students spent four weeks working together exploring enquiry based learning (EBL) in the institution’s central, educational development unit. This phase was approached as an EBL exercise itself; the student groups were given full responsibility for the process with the proviso that by the end of this phase they would have developed a guide for staff and students about EBL. The second phase of the project continues throughout the academic year 07/08. Here, each student worked alongside a member of staff from their department of study to develop discipline specific EBL activities taking a research-informed approach to this development. All pairings were charged with introducing EBL such that no major course change procedures had to be followed; this hopefully ensured the sustainability of such adjustments. Staff and students involved in the project represent dentistry, chemistry, biology, theology, law and psychology and the courses under development range from large first year classes to small honours level courses. An overview of the range of enquiry-based learning developments within the courses will be described
The Speed of Sound in Methane under Conditions of the Thermal Boundary Layer of Uranus
We present the first direct observations of acoustic waves in warm dense
matter. We analyze wavenumber- and energy-resolved X-ray spectra taken from
warm dense methane created by laser-heating a cryogenic liquid jet. X-ray
diffraction and inelastic free electron scattering yield sample conditions of
0.30.1 eV and 0.80.1 g/cm, corresponding to a pressure of
13 GPa and matching the conditions predicted in the thermal boundary
layer between the inner and outer envelope of Uranus. Inelastic X-ray
scattering was used to observe the collective oscillations of the ions. With a
highly improved energy resolution of 50 meV, we could clearly distinguish
the Brillouin peaks from the quasi-elastic Rayleigh feature. Data at different
wavenumbers were used to obtain a sound speed of 5.90.5 km/s, which
enabled us to validate the use of Birch's law in this new parameter regime.Comment: 7 pages, 4 figures with supplementary informatio
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