1,722,721 research outputs found
Sicurezza e Fitosanitari
Full text linkGli Autori descrivono i rischi tossicologici dei prodotti fitosanitari illustrando la normativa di riferimento e le misure di prevenzione e protezioneThe authors describe the toxicological risks of plant protection products, illustrating the relevant regulations and measures of prevention and protectio
PERFORMANCE EVALUATION OF CASCADE REFRIGERATION SYSTEMS USING DIFFERENT REFRIGERANTS
No full textDue to the negative effects of synthetic refrigerants on the environment, natural refrigerants have
obtained again interest as alternative refrigerants for di®erent applications because of their zeroODP
and negligible GWP. This paper presents a thermodynamic analysis of di®erent two-stage cascade refrigeration systems using as refrigerant carbon dioxide (R744) in low-temperature circuit, and, respectively, ammonia (R717), propane (R290), butane (R600), R404A, R410A and R134a in high temperature circuit. The operating parameters considered in this study include condensing and
evaporating temperatures in high-temperature circuit, temperature di®erence in the cascade heat
exchanger, and evaporating and condensing temperatures in the low-temperature circuit.The results obtained show that a cascade refrigeration system using natural refrigerants is an interesting
alternative to systems using synthetic refrigerants for energetic, security and environmental reasons
Normativa, prevenzione ed attuazione della prevenzione incendi e dei piani di evacuazione
No full textGli Autori illustrano la normativa sulla prevenzione incendi e dei piani di evacuazione nei luoghi di lavoroThe authors illustrate the regulations on fire prevention and evacuation plans in the workplac
Normativa, prevenzione ed attuazione della prevenzione incendi e dei piani di evacuazione
No full textGli Autori illustrano la normativa sulla prevenzione incendi e dei piani di evacuazione nei luoghi di lavoroThe authors illustrate the regulations on fire prevention and evacuation plans in the workplac
Pectus deformities
No full textPectus excavatum and pectus carinatum, which represent the two main anterior chest wall deformities, are often associated with systemic weakness of the connective tissues and poor muscular development of the human trunk, including chest, abdomen, and spine. Both forms have, therefore, a markedly increased association with scoliosis and connective tissue disorders such as Marfan and Ehlers-Danlos syndromes
Attività ruolo e funzioni del medico competente. La sorveglianza sanitaria.
No full textGli Autori descrivono il ruolo e le funzioni del medico competente nell'ambito della sicurezza nei luoghi di lavoro.The authors describe the role and functions of a competent doctor in safety in the workplace
Attività ruolo e funzioni del medico competente. La sorveglianza sanitaria.
No full textGli Autori descrivono il ruolo e le funzioni del medico competente nell'ambito della sicurezza nei luoghi di lavoro.The authors describe the role and functions of a competent doctor in safety in the workplace
Evaluating the performances of small wind turbines: a case study in the south of Italy
No full textAbstractAmong renewable energy resources, wind energy became more attractive in the last decade. Wind farms installations dramatically increased in areas where climatic conditions, topography and environment have allowed their development. The installation of wind turbines, usually carried out in remote areas, recently began to cover areas identified by a complex terrain such as urban and suburban zones. Although these new sites’ choices are characterized by lower productivity there is increasing interest in wind energy production in both urban and suburban area. In this work the authors have carried out an energy analysis developed from a sample of small wind turbines available on the market. This study shows how variable can be the energy production of a small wind turbine according to many design and context parameter: wind profiles, installation height, land use, characteristics of the turbine
Pediatric ovarian lesions a common cause of emergency surgery
No full textOVARIAN LESIONS: A COMMON CAUSE OF EMERGENCY SURGERY
Spinelli C (1), Di Giacomo M (1), Bertocchini A (2), Pistolesi F (2), Messineo A (2)
(1) Chair of Pediatric and Infantile Surgery, University of Pisa, Italy (2) Department of Pediatric Surgery, Children's Hospital A. Meyer, Florence, Italy
Introduction: The purpose of this study was to evaluate the clinical presentation and the surgical procedures of ovarian lesions in a large group of girls. Materials and Methods: The medical records of all girls with ovarian lesions admitted to 2 pediatric centers over a 9-year period were reviewed. Presenting symptoms, diagnostic studies, surgical procedure and pathological findings were analyzed. Results: A total of 104 pediatric patients with 111 ovarian lesions(7 girls presented bilateral pathology)were reviewed. The average age was 13,7 years(range: 3 months - 18 years).The most common presenting symptom was abdominal pain(73 cases-65,7%). All girls underwent trans-abdominal US; in 29(26,1%), trans-vaginal US was also performed. Twenty-three(20,7%)required abdominal CT or MRI. Laparoscopy was used in 40(36%); conservative, open or mini-invasive, surgery was possible in 48 cases(43,2%).Pathology showed non neoplastic lesions in 60(54%), follicular cysts(FC)in 33 and hemorrhagic corpus luteum cyst(HCLC)in 27; benign tumors were 47(42,3%)while 5 cases were malignant(4,5%). Twenty cases(18,1%)were treated in emergency; we found 8 HCLC and 7 FC, 3 teratomas and 2 twisted normal ovaries. All patients, except one with yolk-sac tumor, are alive and disease-free. Conclusions: Our experience confirms that often pediatric ovarian lesions present with complications (torsion or rupture)requiring treatment in emergency and extensive surgery. This is the reason why they need to be suspected in any girl who presents abdominal pain, a pelvic or abdominal mass or gynecological endocrine disorders so to allow, whenever possible, conservative surgery to minimize the risk of decreased fertility
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