9,508 research outputs found
The Courier Conundrum: The High Costs of Prosecuting Low-Level Drug Couriers and What We Can Do About Them
Since the United States declared its âWar on Drugs,â federal enforcement of drug-trafficking crimes has led to increased incarceration and longer prison sentences. Many low-level drug couriers and drug mules have suffered disproportionately from these policies; they face mandatory punishments that vastly exceed their culpability. Drug couriers often lack substantial ties to drug-trafficking organizations, which generally recruit vulnerable individuals to act as couriers and mules. By using either threats of violence or promises of relatively small sums of money, these organizations convince recruits to overlook the substantial risks that drug couriers face. The current policies of pursuing harsh punishments for low-level couriers generate significant societal costs. These costs include not only monetary costs but also collateral damage imposed on both the couriers and innocent third parties. Further, these harsh policies fail to generate appreciable benefits or satisfy the goals of either retributive or utilitarian theories of punishment. This Note proposes a legislative amendment to the current importation statute that would create a carveout under which low-level drug couriers could be charged under a separate misdemeanor statute. The proposal lays out a number of criteria that drafters could use to identify lowlevel participants and exempt them from the stiff mandatory minimum sentences and the long-term consequences that accompany a felony drug conviction
Validation of Kalman Filter alignment algorithm with cosmic-ray data using a CMS silicon strip tracker endcap
A Kalman Filter alignment algorithm has been applied to cosmic-ray data. We
discuss the alignment algorithm and an experiment-independent implementation
including outlier rejection and treatment of weakly determined parameters.
Using this implementation, the algorithm has been applied to data recorded with
one CMS silicon tracker endcap. Results are compared to both photogrammetry
measurements and data obtained from a dedicated hardware alignment system, and
good agreement is observed.Comment: 11 pages, 8 figures. CMS NOTE-2010/00
Kinetic Heterogeneities in a Highly Supercooled Liquid
We study a highly supercooled two-dimensional fluid mixture via molecular
dynamics simulation. We follow bond breakage events among particle pairs, which
occur on the scale of the relaxation time . Large scale
heterogeneities analogous to the critical fluctuations in Ising systems are
found in the spatial distribution of bonds which are broken in a time interval
with a width of order . The structure factor of the broken
bond density is well approximated by the Ornstein-Zernike form. The correlation
length is of order at the lowest temperature studied,
being the particle size. The weakly bonded regions thus identified evolve in
time with strong spatial correlations.Comment: 3 pages, 6 figure
Identifying substitutional oxygen as a prolific point defect in monolayer transition metal dichalcogenides with experiment and theory
Chalcogen vacancies are considered to be the most abundant point defects in
two-dimensional (2D) transition-metal dichalcogenide (TMD) semiconductors, and
predicted to result in deep in-gap states (IGS). As a result, important
features in the optical response of 2D-TMDs have typically been attributed to
chalcogen vacancies, with indirect support from Transmission Electron
Microscopy (TEM) and Scanning Tunneling Microscopy (STM) images. However, TEM
imaging measurements do not provide direct access to the electronic structure
of individual defects; and while Scanning Tunneling Spectroscopy (STS) is a
direct probe of local electronic structure, the interpretation of the chemical
nature of atomically-resolved STM images of point defects in 2D-TMDs can be
ambiguous. As a result, the assignment of point defects as vacancies or
substitutional atoms of different kinds in 2D-TMDs, and their influence on
their electronic properties, has been inconsistent and lacks consensus. Here,
we combine low-temperature non-contact atomic force microscopy (nc-AFM), STS,
and state-of-the-art ab initio density functional theory (DFT) and GW
calculations to determine both the structure and electronic properties of the
most abundant individual chalcogen-site defects common to 2D-TMDs.
Surprisingly, we observe no IGS for any of the chalcogen defects probed. Our
results and analysis strongly suggest that the common chalcogen defects in our
2D-TMDs, prepared and measured in standard environments, are substitutional
oxygen rather than vacancies
Structural Probe of a Glass Forming Liquid: Generalized Compressibility
We introduce a new quantity to probe the glass transition. This quantity is a
linear generalized compressibility which depends solely on the positions of the
particles. We have performed a molecular dynamics simulation on a glass forming
liquid consisting of a two component mixture of soft spheres in three
dimensions. As the temperature is lowered (or as the density is increased), the
generalized compressibility drops sharply at the glass transition, with the
drop becoming more and more abrupt as the measurement time increases. At our
longest measurement times, the drop occurs approximately at the mode coupling
temperature . The drop in the linear generalized compressibility occurs at
the same temperature as the peak in the specific heat. By examining the
inherent structure energy as a function of temperature, we find that our
results are consistent with the kinetic view of the glass transition in which
the system falls out of equilibrium. We find no size dependence and no evidence
for a second order phase transition though this does not exclude the
possibility of a phase transition below the observed glass transition
temperature. We discuss the relation between the linear generalized
compressibility and the ordinary isothermal compressibility as well as the
static structure factor.Comment: 18 pages, Latex, 26 encapsulated postscript figures, revised paper is
shorter, to appear in Phys. Rev.
The potential energy landscape of a model glass former: thermodynamics, anharmonicities, and finite size effects
It is possible to formulate the thermodynamics of a glass forming system in
terms of the properties of inherent structures, which correspond to the minima
of the potential energy and build up the potential energy landscape in the
high-dimensional configuration space. In this work we quantitatively apply this
general approach to a simulated model glass-forming system. We systematically
vary the system size between N=20 and N=160. This analysis enables us to
determine for which temperature range the properties of the glass former are
governed by the regions of the configuration space, close to the inherent
structures. Furthermore, we obtain detailed information about the nature of
anharmonic contributions. Moreover, we can explain the presence of finite size
effects in terms of specific properties of the energy landscape. Finally,
determination of the total number of inherent structures for very small systems
enables us to estimate the Kauzmann temperature
The Paradox of Power in CSR: A Case Study on Implementation
Purpose Although current literature assumes positive outcomes for stakeholders resulting from an increase in power associated with CSR, this research suggests that this increase can lead to conflict within organizations, resulting in almost complete inactivity on CSR.
Methods A single in-depth case study, focusing on power as an embedded concept.
Results Empirical evidence is used to demonstrate how some actors use CSR to improve their own positions within an organization. Resource dependence theory is used to highlight why this may be a more significant concern for CSR.
Conclusions Increasing power for CSR has the potential to offer actors associated with it increased personal power, and thus can attract opportunistic actors with little interest in realizing the benefits of CSR for the company and its stakeholders. Thus power can be an impediment to furthering CSR strategy and activities at the individual and organizational level
Dynamics of Highly Supercooled Liquids:Heterogeneity, Rheology, and Diffusion
Highly supercooled liquids with soft-core potentials are studied via
molecular dynamics simulations in two and three dimensions in quiescent and
sheared conditions.We may define bonds between neighboring particle pairs
unambiguously owing to the sharpness of the first peak of the pair correlation
functions. Upon structural rearrangements, they break collectively in the form
of clusters whose sizes grow with lowering the temperature . The bond life
time , which depends on and the shear rate \gdot, is on the order
of the usual structural or relaxation time in weak
shear \gdot \tau_{\alpha} \ll 1, while it decreases as 1/\gdot in strong
shear \gdot\tau_{\alpha} \gg 1 due to shear-induced cage breakage.
Accumulated broken bonds in a time interval () closely
resemble the critical fluctuations of Ising spin systems. For example, their
structure factor is well fitted to the Ornstein-Zernike form, which yields the
correlation length representing the maximum size of the clusters composed
of broken bonds. We also find a dynamical scaling relation, , valid for any and \gdot with in two dimensions and
in three dimensions. The viscosity is of order for any and
\gdot, so marked shear-thinning behavior emerges. The shear stress is close
to a limiting stress in a wide shear region. We also examine motion of tagged
particles in shear in three dimensions. The diffusion constant is found to be
of order with for any and \gdot, so
it is much enhanced in strong shear compared with its value at zero shear. This
indicates breakdown of the Einstein-Stokes relation in accord with experiments.
Some possible experiments are also proposed.Comment: 20pages (including figures
Elastic electron deuteron scattering with consistent meson exchange and relativistic contributions of leading order
The influence of relativistic contributions to elastic electron deuteron
scattering is studied systematically at low and intermediate momentum transfers
( fm). In a -expansion, all leading order
relativistic -exchange contributions consistent with the Bonn OBEPQ models
are included. In addition, static heavy meson exchange currents including boost
terms and lowest order -currents are considered. Sizeable
effects from the various relativistic two-body contributions, mainly from
-exchange, have been found in form factors, structure functions and the
tensor polarization . Furthermore, static properties, viz. magnetic
dipole and charge quadrupole moments and the mean square charge radius are
evaluated.Comment: 15 pages Latex including 5 figures, final version accepted for
publication in Phys.Rev.C Details of changes: (i) The notation of the curves
in Figs. 1 and 2 have been clarified with respect to left and right panels.
(ii) In Figs. 3 and 4 an experimental point for T_20 has been added and a
corresponding reference [48] (iii) At the end of the text we have added a
paragraph concerning the quality of the Bonn OBEPQ potential
How Substitutional Point Defects in Two-Dimensional WS Induce Charge Localization, Spin-Orbit Splitting, and Strain
Control of impurity concentrations in semiconducting materials is essential
to device technology. Because of their intrinsic confinement, the properties of
two-dimensional semiconductors such as transition metal dichalcogenides (TMDs)
are more sensitive to defects than traditional bulk materials. The
technological adoption of TMDs is dependent on the mitigation of deleterious
defects and guided incorporation of functional foreign atoms. The first step
towards impurity control is the identification of defects and assessment of
their electronic properties. Here, we present a comprehensive study of point
defects in monolayer tungsten disulfide (WS) grown by chemical vapor
deposition (CVD) using scanning tunneling microscopy/spectroscopy, CO-tip
noncontact atomic force microscopy, Kelvin probe force spectroscopy, density
functional theory, and tight-binding calculations. We observe four different
substitutional defects: chromium (Cr) and molybdenum
(Mo) at a tungsten site, oxygen at sulfur sites in both bottom and
top layers (O top/bottom), as well as two negatively charged
defects (CDs). Their electronic fingerprints unambiguously corroborate the
defect assignment and reveal the presence or absence of in-gap defect states.
The important role of charge localization, spin-orbit coupling, and strain for
the formation of deep defect states observed at substitutional defects in
WS as reported here will guide future efforts of targeted defect
engineering and doping of TMDs
- âŠ