251 research outputs found
Constraining the absolute neutrino mass scale and Majorana CP violating phases by future neutrinoless double beta decay experiments
Assuming that neutrinos are Majorana particles, in a three generation
framework, current and future neutrino oscillation experiments can determine
six out of the nine parameters which fully describe the structure of the
neutrino mass matrix. We try to clarify the interplay among the remaining
parameters, the absolute neutrino mass scale and two CP violating Majorana
phases, and how they can be accessed by future neutrinoless double beta
() decay experiments, for the normal as well as for the
inverted order of the neutrino mass spectrum. Assuming the oscillation
parameters to be in the range presently allowed by atmospheric, solar, reactor
and accelerator neutrino experiments, we quantitatively estimate the bounds on
, the lightest neutrino mass, that can be infered if the next generation
decay experiments can probe the effective Majorana mass
() down to
1 meV. In this context we conclude that in the case neutrinos are
Majorana particles: (a) if m_0 \gsim 300 meV, {\em i.e.}, within the range
directly attainable by future laboratory experiments as well as astrophysical
observations, then m_{ee} \gsim 30 meV must be observed;
(b) if meV, results from future decay
experiments combined with stringent bounds on the neutrino oscillation
parameters, specially the solar ones, will place much stronger limits on the
allowed values of than these direct experiments.Comment: 26 pages, 11 encapsulated postscript figures. A new figure and minor
changes are included. To be published in Phys. Rev.
Efectividad de clorogenos destinados a agua de consumo
Se propone una metodologĂa para la evaluaciĂłn de productos clorĂłgenos destinados a la desinfecciĂłn de aguas paraconsumo, utilizando materia orgĂĄnica para simular el consumo de cloro que tienen las aguas no tratadas. Se evaluĂłel comportamiento de suspensiĂłn de levadura de cerveza, peptona y extracto de levadura frente a dosis usuales (10mg/L, como cloro total) de comprimidos de la sal disĂłdica de la dicloro-S-triazina-triona. Como comparaciĂłn seutilizĂł agua de rĂo.Se determinĂł la concentraciĂłn de cada sustancia orgĂĄnica que despues de 30 minutos dejĂł 0,1 mg/L de cloro libreen la soluciĂłn de ensayo. Posteriormente se ensayĂł microbiologicamente la efectividad del clorĂłgeno en presencia dedichas sustancias segĂşn metodologĂa AFNOR
147 Description of Burkholderia contaminans isolates recovered from sputum of cystic fibrosis (CF) patients with different courses of infection
NEFRECTOMIA PARCIAL â A EXPERIĂNCIA DE 10 ANOS DO HOSPITAL DE SANTO ANTĂNIO
A nefrectomia parcial (NP) ĂŠ uma tĂŠcnica reconhecida no tratamento de diferentes patologias renais,nomedamente na oncolĂłgica.
Os autores apresentam a sua casuĂstica dos Ăşltimos 10 anos, com avaliação dos Ăndices de recorrĂŞncia e sobrevivĂŞncia
Barriers to Therapeutic Regimen Adherence of Type II Diabetes Mellitus Patients in Iligan City, Philippines
The purpose of this study is to explore the barriers that have an impact on the adherence to therapeutic regimen among Type II diabetics in Iligan City. Specifically, it attempted to evaluate if there's a significant relationship among the patients' length of diagnosis, blood sugar level, awareness of the disease,their relationship towards their doctors and the availability and accessibility to healthcare services as to their adherence to therapeutic regimen in terms of their medication, diet, exercise, lifestyle and stress reduction techniques. It also tried to examine if the patients' profiles (age, gender, religion, civil status,educational attainment, work status, family monthly income, social support system and clinic) can influence their therapeutic regimen adherence. This study used the Descriptive Survey Method. 10 self-structured questionnaires derived from published questionnaires were given to 56 Type II diagnosed diabetes mellitus patients in the private and public clinics of Iligan City, selected through random sampling technique. Data generated by the questionnaires were analyzed using descriptive statistics and correlations. Results from thesurvey showed that the patients' accessibility to healthcare services and their social support system largely affect their medication adherence. Female and working patients are more diligent in taking their medication. Patients having their consultation in the public clinic and those with lower blood glucose level prove to have a better performance in lifestyle modification. Patients who are married, working, and who are more aware about their disease showed to be more effective in reducing stress than the other patients. Patients in thepublic clinic exercise more than those in the private clinics. Finally, the frequency in which the patients were doing exercise is greatly affected on how efficient their healthcare providers ar
Control of rotorcraft retreating blade stall using air-jet vortex generators
A series of low-speed wind tunnel tests were carried out on an oscillating airfoil fitted with two rows of air-jet vortex generators (AJVGs). The airfoil used had an RAE 9645 section and the two spanwise arrays of AJVGs were located at x/c=0.12 and 0.62. The devices and their distribution were chosen to assess their ability to modify/control dynamic stall; the goal being to enhance the aerodynamic performance of helicopter rotors on the retreating blade side of the disc. The model was pitched about the quarter chord with a reduced frequency
(k) of 0.1 in a sinusoidal motion defined by a=15o+10sin_ t. The measured data indicate that, for continuous blowing from the front row of AJVGs with a momentum blowing coefficient (C μ) greater than 0.008, modifications to the stalling process are encouraging. In particular, the pitching moment behavior exhibits delayed stall and there is a marked reduction in the normal force hysteresis
Vs30 estimation using ambient vibrations and seismic refraction experiments - Application to the lower Tagus Valley (Portugal)
The town of Lisbon has been affected by several strong earthquakes in the past originated either offshore or inland. The main inland seismogenic zone is the Lower Tagus Valley (LTV) region oriented NNE-SSW and reaching the northern part of Lisbon at its southern end. It is composed by a system of faults mainly oriented according to the valley trend, but the identification of the particular seismogenic structures able to produce large earthquakes are still under debate. The strongest reported event was the January 31st, 1531 earthquake (Mw = 7.0) that produced large damage in the southern part of the valley, in particular in Lisbon. In recent years the seismic activity in the LTV is characterised by several small earthquakes. The last strong earthquake occurred on April 23rd, 1909 (Mw = 6.1) and destroyed several small towns located in the valley. Due to the concentration of economic and industrial facilities and population density, this region presents high seismic risk in the Portuguese context. Besides, this region can be also affected by large offshore earthquakes, as the 1755 earthquake which source is located southern of Portugal mainland, in the Atlantic Ocean, about 250 km far from Lisbon.
In order to estimate soil ground motion associated to different seismic sources, a map of Vs30 is need. We present here a methodology to estimate Vs30 based on ambient vibrations surveys (single-station and arrays measurements), seismic refraction experiments and geologic and geotechnical information.
This work was partially financed by the Portuguese project PTDC/CTE-GIX/102245/2008 NEFITAG - Strong ground motion and near field effects in the Lower Tagus Valley Region, and the Spanish funded Complementary Action CGL2010-11831-E Identificacion de efectos de sitio en los registros de intensidad sismica en Iberia
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