522 research outputs found
Towards a time-reversal mirror for quantum systems
The reversion of the time evolution of a quantum state can be achieved by
changing the sign of the Hamiltonian as in the polarization echo experiment in
NMR. In this work we describe an alternative mechanism inspired by the acoustic
time reversal mirror. By solving the inverse time problem in a discrete space
we develop a new procedure, the perfect inverse filter. It achieves the exact
time reversion in a given region by reinjecting a prescribed wave function at
its periphery.Comment: 6 pages, 4 figures. Introduction modified, references added, one
figure added to improve the discussio
Medical imaging in the diagnosis of schistosomiasis: a review
Schistosomiasis is one of the most important parasitic diseases and it is endemic in tropical and subtropical areas. Clinical and laboratory data are fundamental for the diagnosis of schistosomiasis, but diagnostic imaging techniques such as x-rays, ultrasound (US), computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography/computed tomography (PET/CT) may be helpful in the evaluation of disease severity and complications. In this context, the aim of this review is to explore the actual role of diagnostic imaging in the diagnosis of schistosomiasis, underlining advantages and drawbacks providing information about the utilization of diagnostic imaging techniques in this context. Furthermore, we aim to provide a useful guide regarding imaging features of schistosomiasis for radiology and nuclear medicine physicians of non-endemic countries: in fact, in the last years non-endemic countries have experienced important flows of migrants from endemic areas, therefore it is not uncommon to face cases of this disease in daily practice
Neuropsychological Functioning in Bilateral versus Unilateral Temporal Lobe Epilepsy
Although relatively specific anatomo-electro-clinical features of temporal lobe epilepsy (TLE) with bilateral ictal involvement (bitemporal epilepsy-BTLE) have been described, differentiating between BTLE and unilateral TLE (UTLE) remains challenging. Surgery is often the treatment of choice for drug-resistant UTLE, whereas its use is more controversial in BTLE. It is currently unclear whether neuropsychological assessment can contribute to the differential diagnosis. We retrospectively reviewed the neuropsychological evaluation of 46 consecutive patients with refractory TLE. Eighteen patients were diagnosed with BTLE on the basis of ictal electro-clinical data, in particular a video EEG recording of at least one seizure simultaneously involving the two temporal lobes without the possibility of lateralizing its onset or at least two different seizures independently arising from the two temporal lobes. Twenty-eight patients were classified as UTLE. Presurgery evaluation data were used in this study. Compared with UTLE, BTLE was associated with a lower intelligence quotient (IQ) and more severe impairment in long-term memory, the latter remaining significant even after controlling for IQ. No significant differences were found between right and left UTLE. In conclusion, BTLE and UTLE are associated with relatively distinct neuropsychological profiles, further supporting their classification as different disorders within the TLE spectrum
Bioecologia, danos e controle de Diaphorina citri e do Huanglongbing em citros e resultado do monitoramento e zoneamento para o Rio Grande do Sul.
bitstream/item/110937/1/Documento-363-web.pd
The development of the British Red Cross' psychosocial framework: 'calmer'
This paper presents the history, development and approach of the new psychosocial framework which in 2008 was adopted by the British Red Cross, and a piece of research designed to review its fitness for purpose as an educational tool. The framework CALMER is a single, overarching approach for considering and delivering psychosocial services across all of the British Red Cross. It is being included in all relevant training programmes, such as within first aid and psychosocial support and within services in emergency response, event first aid, health and social care, international tracing and message and refugee services and across human resources. The framework includes six prompts which should be followed sequentially, with guidance on facilitative behaviours within each. The research considered the levels of confidence and worry of participants on one day training programmes delivered to three different groups of personnel in three different countries. While finding support for the CALMER framework, further recommendations are made for future research
Beyond Ultra-Diffuse Galaxies I: Mass-Size Outliers Among the Satellites of Milky Way Analogs
Large diffuse galaxies are hard to find, but understanding the environments
where they live, their numbers, and ultimately their origins, is of intense
interest and importance for galaxy formation and evolution. Using Subaru's
Hyper Suprime-Cam Strategic Survey Program, we perform a systematic search for
low surface brightness galaxies and present novel and effective methods for
detecting and modeling them. As a case study, we surveyed 922 Milky Way analogs
in the nearby Universe () and build a large sample of
satellite galaxies that are outliers in the mass-size relation. These
``ultra-puffy'' galaxies (UPGs), defined to be above the average
mass-size relation, represent the tail of the satellite size distribution. We
find that each MW analog hosts ultra-puffy
galaxies on average, which is consistent with but slightly lower than the
observed abundance at this halo mass in the Local Volume. We also construct a
sample of ultra-diffuse galaxies (UDGs) in MW analogs and find an abundance of
per host. With literature results, we confirm that
the UDG abundance scales with the host halo mass following a sublinear power
law. We argue that our definition for ultra-puffy galaxies, which is based on
the mass-size relation, is more physically-motivated than the common definition
of ultra-diffuse galaxies, which depends on surface brightness and size cuts
and thus yields different surface mass density cuts for quenched and
star-forming galaxies.Comment: 19 pages, 7 figures, submitted to Ap
ESTIMATION OF REAL PER CAPITA CONSUMPTION OF MEAT IN ITALY
Food consumption refers to the amount of food available for human consumption. The knowledge of
food consumption is crucial to set production and food supply policies, to compare eating habits with
other countries, to assess the nutritional status of a population and to study the relationship between
diet and health. In the last years all these aspects have taken an increasingly important interest because
epidemiological studies have indicated a possible association between high consumption of meat and an
risk of several forms of cancer as well as metabolic and cardiovascular diseases.
Unfortunately meat consumption is often estimated by methods that are inappropriate for this use
because they do not represent the actual amount of meat consumed or, better, eaten by the consumers.
The actual food consumption may be lower than the quantity shown as food availability depending on the
magnitude of wastage and losses of food during the slaughtering, in the household, e.g. during storage,
in preparation and cooking, as plate-waste or quantities fed to domestic animals and pets, thrown or
given away The consumption estimated by FAO and by statistical offices of the various countries through
the national food balance sheets does not indicate the amount of meat, ie the weight of the skeletal
muscles of animals with included or adherent tissues, but the amount of the weighted carcass at the
slaughterhouse, including bones, tendons, connective tissues and fat.
This paper discusses a method of estimating the real per capita consumption of meat in Italy with
accuracy comparable to that of individual consumption, developed by the Study Commission of Animal
Science and Production Association (ASPA). This action responds to the need of producing statistical
indicator related to health food, as recommended by many international organizations (FAO, Eurostat)
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