Borexino, a large volume liquid scintillator detector installed at Gran Sasso laboratory, demonstrated extraordinary sensitivity with respect to neutrino and antineutrino detection, reporting the ...best up to date results on low energy solar neutrino fluxes and performing geo-neutrino detection. Energy and position of 1 MeV events in Borexino are recon- structed with a precision of 5% and 14cm respectively. These performances together with extremely low background provides an excellent opportunity for the study of short distance neutrino oscillations on the eV mass scale with artificial neutrino sources.
The possible layouts for 51Cr (monoenergetic neutrino) and 144Ce–144Pr (antineutrino from β-decay) source experiments in Borexino and the expected sensitivity to sterile neutrinos for three possible designs of the experiment are presented.
The SOX experiment in the neutrino physics Di Noto, L.; Agostini, M.; Althenmüller, K. ...
HAL (Le Centre pour la Communication Scientifique Directe),
2015, Letnik:
38
Journal Article
Recenzirano
Odprti dostop
SOX (Short distance neutrino Oscillations with BoreXino) is a new experiment that takes place at the Laboratori Nazionali del Gran Sasso (LNGS) and it exploits the Borexino detector to study the ...neutrino oscillations at short distance. In different phases, by using two artificial sources 51Cr and 144Ce-144Pr, neutrino and antineutrino fluxes of measured intensity will be detected by Borexino in order to observe possible neutrino oscillations in the sterile state. In this paper an overview of the experiment is given and one of the two calorimeters that will be used to measure the source activity is described. At the end the expected sensitivity to determine the neutrino sterile mass is shown.
We use the LDA+U approach to search for possible ordered ground states of LaSrCoO\(_4\). We find a staggered arrangement of magnetic multipoles to be stable over a broad range of Co \(3d\) ...interaction parameters. This ordered state can be described as a spin-denity-wave-type condensate of \(d_{xy} \otimes d_{x^2-y^2}\) excitons carrying spin \(S=1\). Further, we construct an effective strong-coupling model, calculate the exciton dispersion and investigate closing of the exciton gap, which marks the exciton condensation instability. Comparing the layered LaSrCoO\(_4\) with its pseudo cubic analog LaCoO\(_3\), we find that for the same interaction parameters the excitonic gap is smaller (possibly vanishing) in the layered cobaltite.
Reducing radiation exposure in newborns with birth head trauma Kriukova, Irina A.; Kriukov, Evgeniy Y.; Kozyrev, Danil A. ...
Ortopedii͡a︡, travmatologii͡a︡ i vosstanovitelʹnai͡a︡ khirurgii͡a︡ detskogo vozrasta,
12/2017, Letnik:
5, Številka:
4
Journal Article
Recenzirano
Odprti dostop
Background. Birth head trauma causing intracranial injury is one of the most common causes of neonatal mortality and morbidity. In case of suspected cranial fractures and intracranial hematomas, ...diagnostic methods involving radiation, such as x-ray radiography and computed tomography, are recommended. Recently, an increasing number of studies have highlighted the risk of cancer complications associated with computed tomography in infants. Therefore, diagnostic methods that reduce radiation exposure in neonates are important. One such method is ultrasonography (US).
Aim. We evaluated US as a non-ionizing radiation method for diagnosis of cranial bone fractures and epidural hematomas in newborns with cephalohematomas or other birth head traumas.
Material and methods. The study group included 449 newborns with the most common variant of birth head trauma: cephalohematomas. All newborns underwent transcranial-transfontanelle US for detection of intracranial changes and cranial US for visualization of bone structure in the cephalohematoma region. Children with ultrasonic signs of cranial fractures and epidural hematomas were further examined at a children’s hospital by x-ray radiography and/or computed tomography.
Results and discussion. We found that cranial US for diagnosis of cranial fractures and transcranial-transfontanelle US for diagnosis of epidural hematomas in newborns were highly effective. In newborns with parietal cephalohematomas (444 children), 17 (3.8%) had US signs of linear fracture of the parietal bone, and 5 (1.1%) had signs of ipsilateral epidural hematoma. Epidural hematomas were visualized only when US was performed through the temporal bone and not by using the transfontanelle approach. Sixteen cases of linear fractures and all epidural hematomas were confirmed by computed tomography.
Conclusion. The use of US diagnostic methods reduced radiation exposure in newborns with birth head trauma. US methods (transcranial-transfontanelle and cranial) can be used in screening for diagnosis and personalized monitoring of changes in birth head trauma as well as to reduce radiation exposure.
We present a 1353 days measurement of the geo–neutrino flux in Borexino: the signal was found to be 14.3 ± 4.4 events. This result translates into Sgeo = (38.8 ± 12.0) TNU when a Th/U fixed ...chondritic mass ratio of 3.9 is assumed. Furthermore Borexino data are compatible with a mantle geo–neutrino signal of (15.4 ± 12.3) TNU.
The aim of the study was to obtain an insight into the origin and specific features of myocardial infarction (MI) in 322 subjects below 60 yr of age. Most patients had anginous complaints. The ...incidence of non-anginous forms of MI in patients aged below 45 and 46-60 years was estimated with reference to the occurrence of complications. The structure of these complications and causes of their fatal outcome were elucidated. The prevalence of risk factors of MI in the survivors and patients who died was obtained.
The article is the second part of the one published in the Vol. 1, 2011. The aim of this research is processes modelling and investigation of quantity parameters influence on heating and cooling ...subsystem of VAC systems when balancing that subsystem by various balanced valves and when controlling it by three-way valve. The basic characteristic received and analyzed in model, is balancing-adjusting characteristic (schedule) of mixture in knot depending on a combination of many factors: binding, crosspieces, an arrangement of corresponding valves, pressures and other parameters. For reception of the balancing-adjusting characteristic of subsystem in different operating modes its mathematical model was created, methods of processing and generalization of the data were offered. After that calculations in different modes of use of the crosspieces were done, allowed to define all regime parameters at the set positions of balancing and regulating valves, parity of pressures in a network and a pump, design of armature and entry conditions.
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