2,635 research outputs found
Categorical Aspects of the Double Structure of a Module
In this work we develop some categorical aspects of the double structure of a
module
Real and complex integral closure, Lipschitz equisingularity and applications on square matrices
Recently the authors investigated the Lipschitz triviality of simple germs of
matrices. In this work, we improve some previous results and we present an
extension of an integral closure result for the real setting. These tools are
applied to investigate classes of square matrices singularities classified by
Bruce and Tari
Gender Matters! Analyzing Global Cultural Gender Preferences for Venues Using Social Sensing
Gender differences is a phenomenon around the world actively researched by
social scientists. Traditionally, the data used to support such studies is
manually obtained, often through surveys with volunteers. However, due to their
inherent high costs because of manual steps, such traditional methods do not
quickly scale to large-size studies. We here investigate a particular aspect of
gender differences: preferences for venues. To that end we explore the use of
check-in data collected from Foursquare to estimate cultural gender preferences
for venues in the physical world. For that, we first demonstrate that by
analyzing the check-in data in various regions of the world we can find
significant differences in preferences for specific venues between gender
groups. Some of these significant differences reflect well-known cultural
patterns. Moreover, we also gathered evidence that our methodology offers
useful information about gender preference for venues in a given region in the
real world. This suggests that gender and venue preferences observed may not be
independent. Our results suggests that our proposed methodology could be a
promising tool to support studies on gender preferences for venues at different
spatial granularities around the world, being faster and cheaper than
traditional methods, besides quickly capturing changes in the real world
The impact of psychiatric diagnosis on treatment adherence and duration among victimized children and adolescents in São Paulo, Brazil
OBJECTIVE: Despite the high prevalence of substance abuse and mood disorders among victimized children and adolescents, few studies have investigated the association of these disorders with treatment adherence, represented by numbers of visits per month and treatment duration. We aimed to investigate the effects of substance abuse and mood disorders on treatment adherence and duration in a special program for victimized children in São Paulo, Brazil. METHODS: A total of 351 participants were evaluated for psychiatric disorders and classified into one of five groups: mood disorders alone; substance abuse disorders alone; mood and substance abuse disorders; other psychiatric disorders; no psychiatric disorders. The associations between diagnostic classification and adherence to treatment and the duration of program participation were tested with logistic regression and survival analysis, respectively. RESULTS: Children with mood disorders alone had the highest rate of adherence (79.5%); those with substance abuse disorders alone had the lowest (40%); and those with both disorders had an intermediate rate of adherence (50%). Those with other psychiatric disorders and no psychiatric disorders also had high rates of adherence (75.6% and 72.9%, respectively). Living with family significantly increased adherence for children with substance abuse disorders but decreased adherence for those with no psychiatric disorders. The diagnostic correlates of duration of participation were similar to those for adherence. CONCLUSIONS: Mood and substance abuse disorders were strong predictive factors for treatment adherence and duration, albeit in opposite directions. Living with family seems to have a positive effect on treatment adherence for patients with substance abuse disorders. More effective treatment is needed for victimized substance-abusing yout
Linear decomposition of approximate multi-controlled single qubit gates
We provide a method for compiling approximate multi-controlled single qubit
gates into quantum circuits without ancilla qubits. The total number of
elementary gates to decompose an n-qubit multi-controlled gate is proportional
to 32n, and the previous best approximate approach without auxiliary qubits
requires 32nk elementary operations, where k is a function that depends on the
error threshold. The proposed decomposition depends on an optimization
technique that minimizes the CNOT gate count for multi-target and
multi-controlled CNOT and SU(2) gates. Computational experiments show the
reduction in the number of CNOT gates to apply multi-controlled U(2) gates. As
multi-controlled single-qubit gates serve as fundamental components of quantum
algorithms, the proposed decomposition offers a comprehensive solution that can
significantly decrease the count of elementary operations employed in quantum
computing applications
Hemispheric asymmetry in the sunspot cycle as a nonextensive phenomenon
The appearance of dark sunspots over the solar photosphere is not considered
to be symmetric between the northern and southern hemispheres. Among the
different conclusions obtained by several authors, we can point out that the
North-South asymmetry is a real and systematic phenomenon and is not due to
random variability. In the present work, we selected the sunspot area data of a
sample of 13 solar cycles divided by hemisphere extracted from the Marshall
Space Flight Centre (MSFC) database to investigate the behavior of probability
distributions using an out-of-equilibrium statistical model a.k.a non-extensive
statistical mechanics. Based on this statistical framework, we obtained that
the non-extensive entropic parameter has a semi-sinusoidal variation with a
period of 22 year (Hale cycle). Among the most important results, we can
highlight that the asymmetry index revealed the dominance of the
northern hemisphere against the southern one. Thus, we concluded that the
parameter can be considered an effective measure for diagnosing
long-term variations of the solar dynamo. Finally, our study opens a new
approach to investigating solar variability from the nonextensive perspective.Comment: 17 pages, 2 tables and 5 figures. Submitted to Solar Physic
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