1,781 research outputs found
Crime and Delinquency in Nevada
Crime and justice system have received much attention from American scholars and politicians in the last than 50 years, with issues in adult criminality, delinquency, and penology emerging at the center stage of criminological inquiry. While scholarly literature now includes many studies focused on different regions and cities, there are no large-scale empirical examinations of crime and delinquency in Nevada. One exception is the Social Health of Nevada report issued in 2006 by University of Nevada, Las Vegas (UNLV) Center for Democratic Culture (CDC)
Crossover between Thermally Assisted and Pure Quantum Tunneling in Molecular Magnet Mn12-Acetate
The crossover between thermally assisted and pure quantum tunneling has been
studied in single crystals of high spin (S=10) uniaxial molecular magnet Mn12
using micro-Hall-effect magnetometry. Magnetic hysteresis and relaxation
experiments have been used to investigate the energy levels that determine the
magnetization reversal as a function of magnetic field and temperature. These
experiments demonstrate that the crossover occurs in a narrow (0.1 K) or broad
(1 K) temperature interval depending on the magnitude of the field transverse
to the anisotropy axis.Comment: 5 pages, 4 figure
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The Evidence-Based Investigative Tool (EBIT): a Legitimacy-Conscious Statistical Triage Process for High-Volume Crimes
Funder: University of CambridgeAbstract
Research Question
Based on the evidence at the end of a preliminary investigation of minor, non-domestic assault and public order cases, how accurately can the likelihood of a sanctioned detection be predicted for triage decisions while maintaining high awareness of legitimacy issues?
Data
Investigative records on assault and public order offences recorded by Kent Police, with a case-control sample of 522 randomly selected detected cases and 482 randomly selected undetected cases, a test sample of 931 cases, and an additional 7947 cases for testing the model on all eligible cases in the force area for the initial six months of its use.
Methods
A case control comparison between solved and unsolved cases produced a logistic regression model that was used to predict investigative outcomes in both the test sample and the complete tracking of its use in investigative operations.
Findings
Eight elements of evidence available by the end of the preliminary investigation were found to predict whether a sanctioned detection would result from further investigation: (1) victim supports police prosecution, and evidence includes (2) a named suspect, (3) a cooperative witness, (4) CCTV evidence, (5) confirming police testimony, (6) forensic evidence, (7) a connection to other cases and (8) a report of the crime to police less than 28 days after the incident occurred. When the EBIT was calibrated to identify only the 31% of cases most likely to yield a detection from further investigation, the model correctly forecast 97% of cases that would not be solved, producing only 3% false negatives. It also reduced the false-positive rate from 73 to 22% in cases that did not lead to a sanctioned detection.
Conclusions
A case control analysis of solvability factors at the end of a preliminary investigation can identify almost all of the cases that are likely to be solved, even while the model predicts that the majority of all cases at that point will not be solved.
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Silicon nitride micromesh bolometer arrays for SPIRE
We are developing arrays of bolometers based on silicon nitride micromesh absorbers for the Spectral & Photometric Imaging Receiver (SPIRE) on the Far Infra-Red and Submillimeter Space Telescope (FIRST). The bolometers are coupled to a close-packed array of 1 f(lambda) feedhorns which views the primary mirror through a cooled aperture stop. Feedhorn-coupled bolometers minimize the detector area and throughput and have good optical efficiency. A 1 f(lambda) feedhorn array provides, higher mapping speed than a 2 f(lambda) feedhorn array and reduces the number of jitters required to produce a fully sampled map, but at the cost of more detectors. Individual silicon nitride micromesh bolometers are already able to meet the performance requirements of SPIRE. In parallel we are developing transition-edge detectors read out by SQUID current amplifier. The relatively large cooling power available at 300 mK enables the array to be coupled to a cold SQUID multiplexer, creating a monolithic fully multiplexed array and making large format arrays possible for SPIRE
Spectroscopy of Globular Clusters in M81
We present moderate-resolution spectroscopy of globular clusters (GCs) around
the Sa/Sb spiral galaxy M81 (NGC 3031). Sixteen candidate clusters were
observed with the Low Resolution Imaging Spectrograph on the Keck I telescope.
All are confirmed as bona fide GCs, although one of the clusters appears to
have been undergoing a transient event during our observations. In general, the
M81 globular cluster system (GCS) is found to be very similar to the Milky Way
(MW) and M31 systems, both chemically and kinematically. A kinematic analysis
of the velocities of 44 M81 GCS, (the 16 presented here and 28 from previous
work) strongly suggests that the red, metal-rich clusters are rotating in the
same sense as the gas in the disk of M81. The blue, metal-poor clusters have
halo-like kinematics, showing no evidence for rotation. The kinematics of
clusters whose projected galactocentric radii lie between 4 and 8 kpc suggest
that they are rotating much more than those which lie outside these bounds. We
suggest that these rotating, intermediate-distance clusters are analogous to
the kinematic sub-population in the metal-rich, disk GCs observed in the MW and
we present evidence for the existence of a similar sub-population in the
metal-rich clusters of M31. With one exception, all of the M81 clusters in our
sample have ages that are consistent with MW and M31 GCs. One cluster may be as
young as a few Gyrs. The correlations between absorption-line indices
established for MW and M31 GCs also hold in the M81 cluster system, at least at
the upper end of the metallicity distribution (which our sample probes). On the
whole, the mean metallicity of the M81 GCS is similar to the metallicity of the
MW and M31 GCSs. The projected mass of M81 is similar to the masses of the MW
and M31. Its mass profile indicates the presence of a dark matter halo.Comment: 35 pages, including 11 figures and 9 tables. Accepted for publication
in the Astronomical Journa
Variation resources at UC Santa Cruz
The variation resources within the University of California Santa Cruz Genome Browser include polymorphism data drawn from public collections and analyses of these data, along with their display in the context of other genomic annotations. Primary data from dbSNP is included for many organisms, with added information including genomic alleles and orthologous alleles for closely related organisms. Display filtering and coloring is available by variant type, functional class or other annotations. Annotation of potential errors is highlighted and a genomic alignment of the variant's flanking sequence is displayed. HapMap allele frequencies and linkage disequilibrium (LD) are available for each HapMap population, along with non-human primate alleles. The browsing and analysis tools, downloadable data files and links to documentation and other information can be found at
Migratory Typing: Ten Years Later
In this day and age, many developers work on large, untyped code repositories. Even if they are the creators of the code, they notice that they have to figure out the equivalent of method signatures every time they work on old code. This step is time consuming and error prone.
Ten years ago, the two lead authors outlined a linguistic solution to this problem. Specifically they proposed the creation of typed twins for untyped programming languages so that developers could migrate scripts from the untyped world to a typed one in an incremental manner. Their programmatic paper also spelled out three guiding design principles concerning the acceptance of grown idioms, the soundness of mixed-typed programs, and the units of migration.
This paper revisits this idea of a migratory type system as implemented for Racket. It explains how the design principles have been used to produce the Typed Racket twin and presents an assessment of the project\u27s status, highlighting successes and failures
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High-Power Single Mode Operation of Hybrid Ion-Implanted/Selectively-Oxidized VCSELs
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