908 research outputs found
Homogenization of a Dirichlet semilinear elliptic problem with a strong singularity at in a domain with many small holes
We perform the homogenization of the semilinear elliptic problem
\begin{equation*} \begin{cases} u^\varepsilon \geq 0 & \mbox{in} \;
\Omega^\varepsilon,\\ \displaystyle - div \,A(x) D u^\varepsilon =
F(x,u^\varepsilon) & \mbox{in} \; \Omega^\varepsilon,\\ u^\varepsilon = 0 &
\mbox{on} \; \partial \Omega^\varepsilon.\\ \end{cases} \end{equation*} In this
problem is a Carath\'eodory function such that a.e. for every , with in some
and a function such that and for every . On the other hand the open sets
are obtained by removing many small holes from a fixed
open set in such a way that a "strange term" appears in the
limit equation in the case where the function depends only on .
We already treated this problem in the case of a "mild singularity", namely
in the case where the function satisfies . In this case the solution to the problem
belongs to and its definition is a "natural" and
rather usual one.
In the general case where exhibits a "strong singularity" at , which is the purpose of the present paper, the solution to
the problem only belongs to but in
general does not belongs to any more, even if
vanishes on in some sense.
Therefore we introduced a new notion of solution (in the spirit of the
solutions defined by transposition) for problems with a strong singularity.
This definition allowed us to obtain existence, stability and uniqueness
results
A semilinear elliptic equation with a mild singularity at : existence and homogenization
In this paper we consider semilinear elliptic equations with singularities,
whose prototype is the following \begin{equation*} \begin{cases} \displaystyle
- div \,A(x) D u = f(x)g(u)+l(x)& \mbox{in} \; \Omega,\\ u = 0 & \mbox{on} \;
\partial \Omega,\\ \end{cases} \end{equation*} where is an open
bounded set of ,
is a coercive matrix, is continuous, and
, with
and , if , if ,
if , a.e. .
We prove the existence of at least one nonnegative solution and a stability
result; moreover uniqueness is also proved if is nonincreasing or
"almost nonincreasing".
Finally, we study the homogenization of these equations posed in a sequence
of domains obtained by removing many small holes from a fixed
domain
Presència de parà sits intestinals en uacaris vermells de l'Amazònia peruana
El uacari vermell (Cacajao calvus ucayalii) és una espècie en perill d'extinció la principal à rea de distribució de la qual és la conca del riu YavarÃ, si bé sembla que històricament la seva localització era molt més à mplia. Aquest declivi poblacional podria ser degut a canvis en l'hà bitat, la caça i les malalties, que poden estar causades per parà sits. Aquest article, basat en el primer estudi de la diversitat parasità ria intestinal d'individus uacari vermell de vida lliure a l'Amazònia peruana, revela que els helmints trobats no semblen estar afectant negativament aquestes poblacions i a més no té conseqüències sobre la salut pública.El uácari rojo (Cacajao calvus ucayalii) es una especie en peligro de extinción cuya principal área de distribución es la cuenca del rÃo YavarÃ, si bien parece que históricamente su localización era mucho más amplia. Este declive poblacional podrÃa ser debido a cambios en el hábitat, la caza y las enfermedades, que pueden estar causadas por parásitos. Este artÃculo, basado en el primer estudio de la diversidad parasitaria intestinal de individuos uácari rojo de vida libre en la AmazonÃa peruana, revela que los helmintos hallados no parecen estar afectando negativamente a estas poblaciones y además no tiene consecuencias sobre la salud pública
Pècaris en captivitat
Un grup d'investigadors de la Facultat de Veterinà ria de la UAB, en col·laboració amb institucions locals de l'Amazònia, ha estudiat, durant els darrers 6 anys, la fisiologia de la reproducció del pècari de collar en estat salvatge i en captivitat. Aixà mateix, ha analitzat caracterÃstiques de l'espècie que podrien permetre el desenvolupament de sistemes de cria en captivitat que facilitin a les poblacions locals l'accés a proteïna d'origen animal d'alta qualitat i la reducció de la pressió de caça que pateix l'espècie.Un grupo de investigadores de la Facultad de Veterinaria de la UAB, en colaboración con instituciones locales de la AmazonÃa, ha estudiado durante los últimos 6 años la fisiologÃa de la reproducción del pecarà de collar (un primo lejano del cerdo) en estado salvaje y en cautiverio. Asimismo, han analizado caracterÃsticas de la especie que podrÃan permitir el desarrollo de sistemas de crÃa en cautiverio que permitan a las poblaciones locales el acceso a proteÃna de origen animal de alta calidad y la reducción de la presión de caza que padece la especie
Are patients with mental disorders agressors or victims?
Treball Final de Grau en Psicologia. Codi: PS1048. Curs: 2020/2021Stigma is a condition that imposes barriers in the care and integration of people with mental
disorders in society. Since historical times, people with mental disorders have suffered the
deepest rejection by society. Progressively, their rights and conditions have improved; however,
the discriminatory aspect of stigma has ceased insignificantly due to the perception of danger
that is had on patients. This social perception produces a worse prognosis in the patient's
disorder (greater isolation, depressive symptoms, less job opportunity ...). Therefore, the
objective of the following review is to synthesize the evidence on the real index of violence
exerted by patients with mental disorders; especially the psychotic spectrum.
A bibliographic review was carried out using the Scopus, PubPsych, PsycINFO databases,
where 6 articles were finally collected after the exclusion and inclusion processes. After
reviewing the scientific literature, it can be observed that people with mental disorders are not
dangerous due to their mental disorder by itself, but due to clinical and sociodemographic risk
factors: marital status, age, work situation, supportive climate, abuse of substances or lack of
adherence to treatment. Furthermore, apart from the fact that patients with mental disorders are
non-violent (2%), they are a vulnerable group in the face of victimization and possible crimes
suffered. These findings contrast with the widespread myth that many psychiatric patients are
violent and dangerous, and this knowledge should be used in policies and campaigns to
overcome the stigma associated with mental illness.El estigma es una condición que impone barreras en el cuidado e integración de las personas
con trastorno mental en la sociedad. Desde tiempos históricos, las personas con trastorno
mental han sufrido el rechazo más profundo por parte de la sociedad. De manera progresiva,
sus derechos y condiciones han mejorado; sin embargo, el aspecto discriminatorio del estigma
ha cesado insignificativamente debido a la percepción de peligrosidad que se tiene sobre los
pacientes. Esta percepción social produce un peor pronóstico en el trastorno del paciente
(mayor aislamiento, sÃntomas depresivos, menor oportunidad laboral...). Por tanto, el objetivo de
la siguiente revisión es sintetizar la evidencia sobre el Ãndice real de violencia ejercida por
pacientes con trastorno mental; especialmente el espectro psicótico.
Se llevó a cabo una revisión bibliográfica mediante las bases de datos Scopus, PubPsych,
PsycINFO, dónde finalmente se recogieron 6 artÃculos tras los procesos de exclusión e
inclusión. Tras revisar la literatura cientÃfica, se puede observar que las personas con trastorno
mental no son peligrosas debido a su trastorno mental per se, sino debido a factores clÃnicos y
sociodemográficos de riesgo: estado civil, edad, situación laboral, clima de apoyo, abuso de
sustancias o falta de adherencia a tratamiento. Además, aparte de que los pacientes con
trastorno mental son no violentos (2%), son un grupo vulnerable en relación a la victimización y
posibles delitos sufridos. Estos hallazgos contrastan con el mito generalizado de que muchos
pacientes psiquiátricos son violentos y peligrosos, y este conocimiento debe utilizarse en
polÃticas y campañas para superar el estigma asociado con enfermedades mentales
La estabilidad atmosférica como factor de contaminación del aire: otoño de 1985 en Barcelona
La caça sostenible del pecarà labiat a l'Amazònia peruana
El pecarà labiat, artiodà ctil semblant al senglar europeu, és un recurs de gran importà ncia per als pobladors rurals de l'Amazònia peruana, que els cacen principalment per menjar o vendre la seva carn i per comerciar amb la seva pell. Aquest treball ha estudiat la biologia reproductiva dels pecarÃs labiats de la regió, per determinar el grau de sostenibilitat de la caça autòctona a l'Amazònia peruana. Els resultats mostren la capacitat de l'espècie per recuperar-se de qualsevol agressió i estableix la necessitat de posar en prà ctica estratègies per preservar-la i assegurar l'ús racional dels recursos naturals. D'altra banda, aquest treball mostra la importà ncia de fer partÃceps d'aquests estudis a les comunitats locals amazòniques.El pecarà labiado, artiodáctilo similar al jabalà europeo, es un recurso de gran importancia para los pobladores rurales de la AmazonÃa peruana, que los cazan principalmente para comer o vender su carne y para comerciar con su piel. Este trabajo ha estudiado la biologÃa reproductiva de los pecarÃes labiados de la región, para determinar el grado de sostenibilidad de la caza autóctona en la AmazonÃa peruana. Los resultados muestran la capacidad de la especie para recuperarse de cualquier agresión y establece la necesidad de poner en práctica estrategias de manejo para mantener su preservación y asegurar el uso racional de los recursos naturales. Por otro lado, este trabajo muestra la importancia de hacer partÃcipes de estos estudios a las comunidades locales amazónicas
Effects of Kinesiotape taping on plantar pressure and impact acceleration during walking
Objectives: The aim of this study was to analyse the plantar pressure pattern, contact time, stride rate and impact acceleration in the shank during walking with and without Kinesio Tape (KT®) placed on two muscle groups: Peroneus and Triceps surae. Methods: 29 subjects (12 men, 17 women) participated in the study. KT® was placed on the triceps surae and peroneus and participants walked at two different speeds (V1: 0.73 m/s; V2:1.30 m/s) with and without KT®. The pedobarographic system Biofoot IBV® 6.0 was used to analyse plantar pressure (mean peak pressure [kPa]) in 5 foot areas and the kinematic variables of the study (contact time [s]; stride rate [steps/min]). One uni-axial accelerometer (Sportmetrics®) was placed on the shank for the impact loading analysis. Results: No significant difference was observed on plantar pressure (p>0.05), and kinematics variables (p>0.05) between the KT® and noKT® conditions. However, results revealed a relationship of dependence between speed and plantar pressure and kinematics parameters, especially under the rearfoot and the medial part of the foot (p<0.005). Conclusion: The results suggest that application of KT® on peroneus and triceps surae does not have a direct effect on the kinematic pattern of healthy individuals during walking
Outbreak of Zika virus pathogenesis and quest of its vaccine development: Where do we stand now?
Zika virus (ZIKV) infection is a life-threatening tropical infection, mainly caused by mosquito bite. After a very long period of quietness, ZIKV infections have become a problematic issue again. Previously, the virus was limited to Africa and Asia only but later it emerged in Brazil, South America, and other parts of the world in 2015. In 2016, there are emerging new cases of sexually transmitted ZIKV infection as well. At present, there is no proper treatment and available pronounced vaccines for the treatment of ZIKV infection. The prime focal point of this review is not only to provide imperative epidemiological information on ZIKV infection in brief but also the current situation of vaccines testing on animal model as well as in clinical trial phases. Currently there is no human vaccine for this pestiferous viral infection. Therefore, prevention, proper management, and up-to-date recommendation are crucial to mitigate the possible risk of vector and non-vector transmission of ZIKV
Daily Solar Energy Estimation for Minimizing Energy Storage Requirements in PV Power Plants
This paper proposes an optimized energy management strategy (EMS) for photovoltaic (PV) power plants with energy storage (ES) based on the estimation of the daily solar energy production. This EMS produces a constant-by-hours power reference which mitigates the stochastic nature of PV production typically associated to the solar resource, and enables PV power plants to take part in the day and intraday electricity markets. The possibility of using the intraday market sessions to refine the plant's power reference paves the way to minimizing the energy capacity ratings of the ES system required to operate the PV power plant without incurring excessive production deviations. This proposal is analyzed on an annual basis using actual irradiance data and theoretical irradiance models extracted from official databases
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