237 research outputs found
Low Power Analog Design in Scaled Technologies
In this paper an overview on the main issues in analog IC design in scaled CMOS technology is presented. Decreasing the length of MOS channel and the gate oxide has led to undoubted advantages in terms of chip area, speed and power consumption (mainly exploited in the digital parts). Besides, some drawbacks are introduced in term of power leakage and reliability. Moreover, the scaled technology lower supply voltage requirement has led analog designers to find new circuital solution to guarantee the required performance
Inventing and implementing future-ready archival education
The Archival / Preservation Education SIG panel engages with community-responsive master's-level archival education. Seven ten-minute individual presentations and audience discussion traverse the decision points in managing curricular change; presenters bring perspectives from multiple states.
"Audio Preservation as Metacognitive Archival Education" by Sarah Buchanan discusses how audiovisual archiving experiences support the continual development of students' metacognitive skills during their graduate program. Based on community collaboration, the activity progressions provide students with digital experiences, faculty with curricular guidance, and online audiences with more representative primary sources.
"LIS Students Contributing to Building a Sustainable Digital Community Archive" by Krystyna Matusiak describes a community-based two-year project aimed at preserving and promoting the Park County Local History Archive in rural Colorado, now available at https://pclha.cvlcollections.org/. The presentation illustrates students' many contributions: organizing materials and assessing their copyright status, digitizing photographs, converting oral histories, creating metadata records, building exhibits, and showcasing community resilience.
"Changing Horses Midstream: Revising Curriculum and Student Engagement to Ensure a Resilient Future" by Edward Benoit, III and Amanda Lima discusses the revision process for transitioning two programs to LSU Online, compares assessments from the traditional and LSU Online programs, and reflects on completing the first year. Additionally, the presenters will highlight the use of student-run Slack channels and virtual coffee hours as online student community building tools for the new LSU Online students, and discuss the school's future in the platform.
"Producing Practical Professionals with Curriculum for Equity, Diversity, and Inclusion" by Aisha Johnson acknowledges that cultural heritage programs should address the need for cultural preservation and reflection, for archivists of Black, Indigenous, and Persons of Color (BIPOC) heritage. The presentation will review a reestablished Archives and Records Management concentration, with core archival and complementary knowledge curriculum, as a case study for exploring new approaches to pedagogy on the purpose, value, and importance of archives in society.
"Learning from Experience: Lessons from a Virtual Service-Learning Experiment" by Colin Post discusses a service-learning project documenting an artist's performance as well as their artwork archives. While such projects place even greater pressure on the instructor as a project manager, they enhance connections between theory and practice in online courses.
"Lessons Learned from the Digital Preservation Outreach and Education Network" by Anthony Cocciolo and Erin Barsan discusses the types of needs they have uncovered, the communities served, and the lessons learned over the course of a year running DPOE-N. The Network's response to the COVID-19 pandemic comprises microfunding for professional development and emergency hardware support for cultural heritage professionals.
"National Forum Grant Project: Exploring New Frontiers in 21st Century Archival Education" by Alex Poole and Jane Zhang discusses the environmental scan, National Forum event, and final outputs of their year-long project. The presentation addresses motivation and need, historical and current context, research components, and intended results and impact.
The moderator will facilitate Q&A within and across the presentations
Attenuated live infectious bronchitis virus QX vaccine disseminates slowly to target organs distant from the site of inoculation
Infectious bronchitis (IB) is a highly contagious respiratory disease of poultry, caused by the avian coronavirus infectious bronchitis virus (IBV). Currently, one of the most relevant genotypes circulating worldwide is IBV-QX (GI-19), for which vaccines have been developed by passaging virulent QX strains in embryonated chicken eggs. Here we explored the attenuated phenotype of a commercially available QX live vaccine, IB Primo QX, in specific pathogens free broilers. At hatch, birds were inoculated with QX vaccine or its virulent progenitor IBV-D388, and postmortem swabs and tissues were collected each day up to eight days post infection to assess viral replication and morphological changes. In the trachea, viral RNA replication and protein expression were comparable in both groups. Both viruses induced morphologically comparable lesions in the trachea, albeit with a short delay in the vaccinated birds. In contrast, in the kidney, QX vaccine viral RNA was nearly absent, which coincided with the lack of any morphological changes in this organ. This was in contrast to high viral RNA titers and abundant lesions in the kidney after IBV D388 infection. Furthermore, QX vaccine showed reduced ability to reach and replicate in conjunctivae and intestines including cloaca, resulting in significantly lower titers and delayed protein expression, respectively. Nephropathogenic IBVs might reach the kidney also via an ascending route from the cloaca, based on our observation that viral RNA was detected in the cloaca one day before detection in the kidney. In the kidney distal tubular segments, collecting ducts and ureter were positive for viral antigen. Taken together, the attenuated phenotype of QX vaccine seems to rely on slower dissemination and lower replication in target tissues other than the site of inoculation
The measuring systems of the wire tension for the MEG II Drift Chamber by means of the resonant frequency technique
The ultra-low mass Cylindrical Drift Chamber designed for the MEG experiment
upgrade is a challenging apparatus made of 1728 phi = 20 micron gold plated
tungsten sense wires, 7680 phi = 40 micron and 2496 phi = 50 micron silver
plated aluminum field wires. Because of electrostatic stability requirements
all the wires have to be stretched at mechanical tensions of about 25, 19 and
29 g respectively which must be controlled at a level better than 0.5 g. This
chamber is presently in acquisition, but during its construction about 100
field wires broke, because of chemical corrosion induced by the atmospheric
humidity. On the basis of the experience gained with this chamber we decided to
build a new one, equipped with a different type of wires less sensitive to
corrosion. The choice of the new wire required a deep inspection of its
characteristics and one of the main tools for doing this is a system for
measuring the wire tension by means of the resonant frequency technique, which
is described in this paper. The system forces the wires to oscillate by
applying a sinusoidal signal at a known frequency, and then measures the
variation of the capacitance between a wire and a common ground plane as a
function of the external signal frequency. We present the details of the
measuring system and the results obtained by scanning the mechanical tensions
of two samples of MEG II CDCH wires and discuss the possible improvements of
the experimental apparatus and of the measuring technique.Comment: Ten pages, twelve figures, to be submitted to Nuclear Instruments and
Methods
A fast and low noise charge sensitive preamplifier in 90 nm CMOS technology
A fast charge sensitive preamplifier was designed and built in a 90 nm CMOS technology. The work is part of the R&D effort towards the read out of pixel or small strip sensors in next generation HEP experiments. The preamplifier features outstanding noise performance given its wide bandwidth, with a ENC (equivalent noise charge) of about 350 electrons RMS with a detector of 1 pF capacitance. With proper filtering, the ENC drops to less than 200 electrons RMS. Power consumption is 5 mW for one channel, and the closed loop bandwith is about 180 MHz, for a risetime down to 2 ns in the fastest operation mode. Thanks to some freedom left to the user in setting the open loop gain, detectors with larger source capacitance can be read out without significant loss in bandwidth, being the rise time still 5.5 ns for a 5.6 pF detector. The output can drive a 50 Ω terminated transmission line. © 2012 2012 IOP Publishing Ltd and SISSA
Highlights from the Pierre Auger Observatory
The Pierre Auger Observatory is the world's largest cosmic ray observatory.
Our current exposure reaches nearly 40,000 km str and provides us with an
unprecedented quality data set. The performance and stability of the detectors
and their enhancements are described. Data analyses have led to a number of
major breakthroughs. Among these we discuss the energy spectrum and the
searches for large-scale anisotropies. We present analyses of our X
data and show how it can be interpreted in terms of mass composition. We also
describe some new analyses that extract mass sensitive parameters from the 100%
duty cycle SD data. A coherent interpretation of all these recent results opens
new directions. The consequences regarding the cosmic ray composition and the
properties of UHECR sources are briefly discussed.Comment: 9 pages, 12 figures, talk given at the 33rd International Cosmic Ray
Conference, Rio de Janeiro 201
A search for point sources of EeV photons
Measurements of air showers made using the hybrid technique developed with
the fluorescence and surface detectors of the Pierre Auger Observatory allow a
sensitive search for point sources of EeV photons anywhere in the exposed sky.
A multivariate analysis reduces the background of hadronic cosmic rays. The
search is sensitive to a declination band from -85{\deg} to +20{\deg}, in an
energy range from 10^17.3 eV to 10^18.5 eV. No photon point source has been
detected. An upper limit on the photon flux has been derived for every
direction. The mean value of the energy flux limit that results from this,
assuming a photon spectral index of -2, is 0.06 eV cm^-2 s^-1, and no celestial
direction exceeds 0.25 eV cm^-2 s^-1. These upper limits constrain scenarios in
which EeV cosmic ray protons are emitted by non-transient sources in the
Galaxy.Comment: 28 pages, 10 figures, accepted for publication in The Astrophysical
Journa
Reconstruction of inclined air showers detected with the Pierre Auger Observatory
We describe the method devised to reconstruct inclined cosmic-ray air showers
with zenith angles greater than detected with the surface array of
the Pierre Auger Observatory. The measured signals at the ground level are
fitted to muon density distributions predicted with atmospheric cascade models
to obtain the relative shower size as an overall normalization parameter. The
method is evaluated using simulated showers to test its performance. The energy
of the cosmic rays is calibrated using a sub-sample of events reconstructed
with both the fluorescence and surface array techniques. The reconstruction
method described here provides the basis of complementary analyses including an
independent measurement of the energy spectrum of ultra-high energy cosmic rays
using very inclined events collected by the Pierre Auger Observatory.Comment: 27 pages, 19 figures, accepted for publication in Journal of
Cosmology and Astroparticle Physics (JCAP
The Pierre Auger Observatory: Contributions to the 34th International Cosmic Ray Conference (ICRC 2015)
Contributions of the Pierre Auger Collaboration to the 34th International
Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The NetherlandsComment: 24 proceedings, the 34th International Cosmic Ray Conference, 30 July
- 6 August 2015, The Hague, The Netherlands; will appear in PoS(ICRC2015
- …