1,173 research outputs found
Clinical-evolutional particularities of the cryoglobulinemic vasculitis in the case of a patient diagnosed with hepatitis C virus in the predialitic phase
Hepatitis C virus (HCV) represents a fundamental issue for public health, with long term evolution and the gradual appearance of several complications and associated pathologies. One of these pathologies is represented by cryoglobulinemic vasculitis, a disorder characterized by the appearance in the patient’s serum of the cryoglobulins, which typically precipitate at temperatures below normal body temperature (37°C) and dissolve again if the serum is heated. Here, we describe the case of a patient diagnosed with HCV that, during the evolution of the hepatic disease, developed a form of cryoglobulinemic vasculitis. The connection between the vasculitis and the hepatic disorder was revealed following treatment with interferon, with the temporary remission of both pathologies and subsequent relapse at the end of the 12 months of treatment, the patient becoming a non-responder. The particularity of the case is represented by both the severity of the vasculitic disease from its onset and the deterioration of renal function up to the predialitic phase, a situation not typical of the evolution of cryoglobulinemia. Taking into account the hepatic disorder, the inevitable evolution towards cirrhosis, and the risk of developing the hepatocellular carcinoma, close monitoring is necessary
Results of Evolution Supervised by Genetic Algorithms
A series of results of evolution supervised by genetic algorithms with
interest to agricultural and horticultural fields are reviewed. New obtained
original results from the use of genetic algorithms on structure-activity
relationships are reported.Comment: 6 pages, 1 Table, 2 figure
Pancreatogenic type 3C diabetes
Background. The relationship between chronic pancreatitis and diabetes is well established. This form of diabetes is secondary to exocrine pancreatic disorder and is known as diabetes mellitus type 3c (T3cDM).
Materials and Methods. In this retrospective study we included 261 patients, 59 patients being diagnosed with chronic pancreatitis and secondary diabetes mellitus, and admitted in the Fundeni Clinical Institute, 2nd Department of Gastroenterology or N.C. Paulescu Institute/ Carol Davila University of Medicine and Pharmacy.
Results and Discussions. Patients were 22.2% women and 77.8% men, with an average age of 56.8 years and 53.4 years respectively. 63% came from urban areas. The mean duration of chronic pancreatitis was six years. Non-diabetic patients were compared with patients who were previously diagnosed with T3cDM and who had been analyzed for body mass index (BMI). Imaging investigations were also performed to confirm pseudotumors or pancreatic tumours. Patients already considered non-diabetic had basal blood glucose values and were mostly overweight and obese. In this context, insulin resistance cannot be excluded for this group of patients.
Conclusions. T3cDM is a new pathological entity that needs to be explored more deeply, and that should benefit from both a diagnostic stratification and treatment
Nonlinear Near-Field Microwave Microscope For RF Defect Localization in Superconductors
Niobium-based Superconducting Radio Frequency (SRF) cavity performance is
sensitive to localized defects that give rise to quenches at high accelerating
gradients. In order to identify these material defects on bulk Nb surfaces at
their operating frequency and temperature, it is important to develop a new
kind of wide bandwidth microwave microscopy with localized and strong RF
magnetic fields. By taking advantage of write head technology widely used in
the magnetic recording industry, one can obtain ~200 mT RF magnetic fields,
which is on the order of the thermodynamic critical field of Nb, on submicron
length scales on the surface of the superconductor. We have successfully
induced the nonlinear Meissner effect via this magnetic write head probe on a
variety of superconductors. This design should have a high spatial resolution
and is a promising candidate to find localized defects on bulk Nb surfaces and
thin film coatings of interest for accelerator applications.Comment: 4 pages, 6 figures Journal-ref: 2010 Applied Superconductivity
Conferenc
Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
We study theoretically electron spins in nanowire quantum dots placed inside
a transmission line resonator. Because of the spin-orbit interaction, the spins
couple to the electric component of the resonator electromagnetic field and
enable coherent manipulation, storage, and read-out of quantum information in
an all-electrical fashion. Coupling between distant quantum-dot spins, in one
and the same or different nanowires, can be efficiently performed via the
resonator mode either in real time or through virtual processes. For the latter
case we derive an effective spin-entangling interaction and suggest means to
turn it on and off. We consider both transverse and longitudinal types of
nanowire quantum-dots and compare their manipulation timescales against the
spin relaxation times. For this, we evaluate the rates for spin relaxation
induced by the nanowire vibrations (phonons) and show that, as a result of
phonon confinement in the nanowire, this rate is a strongly varying function of
the spin operation frequency and thus can be drastically reduced compared to
lateral quantum dots in GaAs. Our scheme is a step forward to the formation of
hybrid structures where qubits of different nature can be integrated in a
single device
Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111)
There is presently a tremendous activity around the field of topological
superconductivity and Majorana fermions. Among the many questions raised, it
has become increasingly important to establish the topological or
non-topological origin of features associated with Majorana fermions such as
zero-bias peaks. Here, we compare in-gap features associated either with
isolated magnetic impurities or with magnetic clusters strongly coupled to the
atomically thin superconductor Pb/Si(111). We study this system by means of
scanning tunneling microscopy and spectroscopy (STM/STS). We take advantage of
the fact that the Pb/Si(111) monolayer can exist either in a crystal-ordered
phase or in an incommensurate disordered phase to compare the observed
spectroscopic features in both phases. This allows us to demonstrate that the
strongly resolved in-gap states we found around the magnetic clusters in the
disordered phase of Pb have a clear topological origin.Comment: 11 pages, 5 figures. To be published in European Physical Journal
Special Topics.dedicated to the conference FQMT'1
EXPERIMENTAL RESEARCHES REGARDING THE DENSIMETRIC SEPARATOR FOR CLEANING OF THE WHEAT DESTINED TO MILLING
The cleaning of cereal seeds represent an essential operation of the conditioning chain. Taking into account all considerations, the experts׳ attention has been drawn by the study of phenomena which influence upon the impurities separation process, aiming at a maximum reduction impurities. The paper presents the constructive and functional scheme of an densimetric separator driven by means of electrical motovibrators, in view of theirs utilisation with best results for the drive of vibrating sieves. The results of the experimental researches are highlighted, after which the optimal operating parameters were established
Asymptotic Stability for a Class of Metriplectic Systems
Using the framework of metriplectic systems on we will describe a
constructive geometric method to add a dissipation term to a Hamilton-Poisson
system such that any solution starting in a neighborhood of a nonlinear stable
equilibrium converges towards a certain invariant set. The dissipation term
depends only on the Hamiltonian function and the Casimir functions
Negative effects of energy-saving, non-linear loads on LV systems : causes and recommendations
Abstract: Pressure is being exerted on utilities and electrical energy customers to reduce energy consumption. There are two concerns: the effect that increasing greenhouse gasses have on global warming and the dwindling non-renewable resources currently used for the production of electrical power. The use of modern energy-efficient appliances such as Compact Fluorescent Lamps and micro-wave ovens is a widely promoted solution. These types of devices are recommended not only in affluent areas but also in developing countries (such as South Africa) where the use of computers and television sets are also being encouraged as devices for increasing the level of information and education. However, the use of these devices can introduce significant problems. This paper reviews a range of published material on the various aspects of this topic. It also includes the results from experimental measurements. Finally, the paper discusses some recommendations that are intended to bridge the gap between theoretical analyses and the practical implementation of mitigating steps, as they apply to low voltage distribution systems
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