426 research outputs found
A problem of emphasizing features of a surface roughness by means the Discrete Wavelet Transform
When we are interested to the detection of the roughness features by means of the 3D reconstruction, based on photometric stereo techniques,
an important problem is the elimination of the brightness variation due to different light conditions which can alter the response.
This paper will concentrate on presenting results of a new method for eliminating this problem.
Every pixel of a picture gives only one number: the brightness of the corresponding point on the object, whereas the surface orientation is
described by a normal vector that has two degrees of freedom. The level of brightness depends on many factors as well as the homogeneity
of reflection properties of the material or its physical continuity and the surface smoothness or roughness.
In this work we will show how the application of the Discrete Wavelet Transform (DWT) to the processing of some images, captured
on different light conditions, permits to solve the problem of emphasizing roughness features of a metallic surface. Wavelet transforms can
model irregular data patterns such as sharp changes, better than the Fourier transforms and standard statistical procedures (e.g., parametric
and non-parametric regressions) and provide a multiresolution approximation to the data.
Here we propose, also, a non-parametric method, based on the wavelet theory, for the estimation of the threshold level of a gray levels
distribution, obtained from the intensity image matrix
Green Hydrogen Powered Forklifts in Industrial Transport: Case Study of an Italian Fruit and Vegetable Market
Spigelian hernia: a case report and review of the literature
Spigelian hernia is a rare abdominal hernia that occurs through Spigelian aponeurosis.
The Authors present a case of Spigelian hernia associated with narrowing of sigmoid colon and diverticular pathology.They also described historical background, surgical anatomy and etiopathogenesis of this hernia. By a remarkable revision of literature, they sum up epidemiology and clinical features of Spigelian hernia. Furthermore, they discuss diagnostic and therapeutic principles
A liver angioma colonized by colon cancer cells in a patient with two primitive localizations by colon adenocarcinoma: biologic, diagnostic and therapeutic implications
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Chemically exfoliated graphene detects NO2 at the ppb level
Abstract The high sensitivity of graphene to the adsorption/desorption of gas molecule, is at the very beginning of its exploitation. This sensitivity relies on the two-dimensional nature of graphene allowing a total exposure of all its atoms to the adsorbing gas molecules, thus providing the greatest sensor area per unit volume. Indeed several technological limits weigh on the synthesis and manipulation of the material for the device fabrication. Herein a simple approach to fabricate conductometric sensors based on chemically exfoliated natural graphite is presented. The devices were tested upon sub-ppm concentrations of NO 2 in environmental conditions and show the ability to detect this toxic gas down to few ppb at room temperature
Le lesioni polipoidi della colecisti: problemi diagnostici e terapeutici
Le lesioni polipoidi della colecisti costituiscono un’entità eterogenea di difficile definizione diagnostica preoperatoria. L’indicazione
chirurgica è discutibile ma in alcuni casi obbligatoria .
In questo studio abbiamo analizzato i dati clinici relativi a 25
pazienti sottoposti consecutivamente a colecistectomia laparoscopica
per formazioni polipoidi. Ciò al fine di evidenziare la possibile correlazione fra aspetto ecografico e valutazione istopatologica e di definire
l’indicazione terapeutica
Use of complementary and alternative medicine (CAM) in cancer patients. An italian multicenter survey
INTRODUCTION:
Complementary and Alternative Medicine (CAM) include a wide range of products (herbs, vitamins, minerals, and probiotics) and medical practices, developed outside of the mainstream Western medicine. Patients with cancer are more likely to resort to CAM first or then in their disease history; the potential side effects as well as the costs of such practices are largely underestimated.
PATIENTS AND METHOD:
We conducted a descriptive survey in five Italian hospitals involving 468 patients with different malignancies. The survey consisted of a forty-two question questionnaire, patients were eligible if they were Italian-speaking and receiving an anticancer treatment at the time of the survey or had received an anticancer treatment no more than three years before participating in the survey.
RESULTS:
Of our patients, 48.9% said they use or have recently used CAM. The univariate analysis showed that female gender, high education, receiving treatment in a highly specialized institute and receiving chemotherapy are associated with CAM use; at the multivariate analysis high education (Odds Ratio, (OR): 1.96 95% Confidence Interval, CI, 1.27-3.05) and receiving treatment in a specialized cancer center (OR: 2.75 95% CI, 1.53-4.94) were confirmed as risk factors for CAM use.
CONCLUSION:
Roughly half of our patients receiving treatment for cancer use CAM. It is necessary that health professional explore the use of CAM with their cancer patients, educate them about potentially beneficial therapies in light of the limited available evidence of effectiveness, and work towards an integrated model of health-care provision
High cardiovascular risk in patients with Type 2 diabetic nephropathy: the predictive role of albuminuria and glomerular filtration rate. The NID-2 Prospective Cohort Study
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