117 research outputs found
Art. 52 commento
No full textCommento all'art. 52 tub sulle comunicazioni del dollegio sindacale e dei soggetti incaricati alla revision
Thermal conversion of lignin-rich residues from lignocellulose biorefining: From thermogravimetry to updraft gasification
No full textThe reported work deals with the use of lignin rich solid, which is available as residue from enzymatic hydrolysis of lignocellulosic biomass, to produce syngas. The tested process was an updraft gasification carried out at pilot scale of about 20 kg/h as dry feed. The thermal conversion of the residue was investigated by TGA in air, carbon dioxide and nitrogen atmospheres pointing out the relative contribute of pyrolysis, combustion and gasification at different temperatures. In the plant tests, the residue was completely converted in gaseous and liquid energy carriers with overall energy efficiency near 90%. Several process conditions were examined corresponding to different flows of O2 and steam. The molar ratio H2/CO in syngas increased by using steam as co-gasification agent. Steam was necessary to stabilize the process in the case of using oxygen as main gasification agent. Oxy-steam gasification provided the best results in terms of syngas heating value and highest thermal power output of the plant. © 2017, ETA-Florence Renewable Energies. All rights reserved
Double-Cross Flap Protection: New Technique for Coverage of Neourethra in Hypospadias Repair
No full textPurpose: We analyzed a new urethra preserving approach, double-cross flap protection, during tubularized incised plate urethroplasty. We compared the results of 57 patients treated with this new procedure and 80 patients treated with 2 different techniques. Materials and Methods: We studied 137 patients with hypospadias between October 2002 and March 2008. Patients were divided into 3 groups. Group 1 consisted of 40 patients (mean age 50 months) undergoing tubularized incised plate urethroplasty. Group 2 included 40 patients (mean age 48 months) undergoing tubularized incised plate urethroplasty with dorsal subcutaneous flap. Group 3 consisted of 57 patients (mean age 39 months) undergoing tubularized incised plate urethroplasty with 2 de-epithelialized preputial flaps twisted ventrally and sutured individually over the neourethra. All patients were operated on by the same surgeons. Statistical analysis of postoperative complications was performed by ANOVA and chi-square test. Results: In Group 1 fistula developed in 6 patients (15%) and was associated with stenosis of the neourethra in 4 (10%). In Group 2 fistula developed in 4 patients (10%). In Group 3 no fistula was observed, but mild stenosis of the neomeatus developed in 3 patients (5.3%), which was treated with dilation. Thus, the incidence of fistula in group 3 was significantly less (p = 0.015). Conclusions: Double-cross flap protection is safe and significantly reduces the incidence of postoperative fistula. © 2009 American Urological Association
Scrotal Dog Bite: Unusual Case and Review of Pediatric Literature
No full textAnimal bites to human external genitalia are rare. Only a few cases of scrotal dog bite in children have been reported. We present an additional specific case of a scrotal dog bite in a child because the lesion and its repair have not been previously reported in published pediatric studies. A traumatic resection of the right testicular vas deferens was repaired by microsurgical vasoepididymal anastomosis. A review of the published data was also performed to analyze the management of scrotal dog bite lesions. © 2009 Elsevier Inc. All rights reserved
An unusual case of asymptomatic appendicular cutting foreign body
No full textForeign body ingestion is a common problem in pediatric age. Foreign bodies in the lumen of appendix is a well known event. In this condition perforation or appendicitis may occur even for blunt or sharp objects. For these reasons, in case of stasis of foreign body in the lumen of appendix a prophylactic appendectomy is recommended. A case of asymptomatic ingested cutting foreign body in the appendix is presented and the approach is discussed according to the literature data
Laparoscopic Repair of Paediatric Indirect Inguinal Hernia: Modified Flip Flap Technique
Get PDFIn paediatric age, indirect inguinal hernia represents more than 95% of the hernial disease. It is a congenital type, in contrast with adulthood in which acquired forms are more frequently found (1). The laparoscopic correction of indirect inguinal hernia is one of the most common surgeries performed in paediatric age. In recent years, various techniques have been introduced for the videolaparoscopic correction of this disease. The aim of this study is to provide an assessment of the efficacy and safety of the execution of a modified Flip-Flap technique, using tissue glue for filling of Peritoneal-vaginal duct (DPV), performed in order to ensure greater suture tightness and reduce the incidence of postoperative hydrocele. author1, author2, author 2, author1, author1, author 2 The Authors present a retrospective review of their record of cases, considering a total of 187 patients aged between 18 months and 14 years. For the correction of the hernial defect, the modified VLS Flip-Flap technique was carried out. The evaluation of safety, efficacy, operating time, relapse rate and development of short-term complications (such as postoperative hydrocele, scrotal hematoma or ecchymosis, atrophy or iatrogenic testicle ascension) was considered in a mean follow-up of 6 months. The Authors suggest that this variant of the peritoneal Flip-Flap technique is simple to perform; its safety, reproducibility and effectiveness is proven and has a percentage of relapses and complications overlapping with the "open" approach and superior to other laparoscopic techniques
Air-steam and oxy-steam gasification of hydrolytic residues from biorefinery
No full textThis paper reports the use of lignin-rich solid, derived from enzymatic hydrolysis of lignocellulosic biomass, to produce syngas and pyrolysis oil. The tested process was an updraft gasification carried out at pilot scale of about 20 kg/h as solid feed. The reactivity of two residues, one from straw and one from cane, was investigated by TGA in air, oxygen, nitrogen, using a heating program simulating the thermal gradient in the gasifiers. Below 400 °C the residues completely burned in air or oxygen with an apparent reaction order of 0.1–0.2. The 75%–80% of the organic mass was pyrolysed at 700 °C, when the gasification with H2O and CO2 started. In the plant tests, the residue was completely converted in gaseous and liquid energy carriers with an overall energy efficiency of up to 87%. Ten conditions were examined with different air flow (19.0, 25.5, 26.5 kg/h), O2 (4.0, 4.5, 5.5 kg/h) or H2O (as steam at 160 °C: 1, 2.5, 4.0, 4.5, 5.5, 8.5 kg/h). The experimental data were analyzed using the Response Surface Analysis (RSA) in order to highlight the dependence on the Equivalence Ratios of oxidation. The molar ratio H2/CO in the syngas increased by using steam as co-gasification agent, and reached the value of 2.08 in oxy-steam gasification. Steam was necessary to stabilize the process when using oxygen as it was effective in lowering the average temperature in the gasifier. Another positive effect of using steam was the shift of the temperature maximum far from the grate where ash melting could occur. Oxy-steam gasification provided the best results in terms of syngas heating value (LHV 10.9 MJ/m3) and highest thermal power output of the plant (67 kWth). The tar yield was inversely correlated with the residence time of the gas in the bed, in according with a zero order reaction for tar cracking into incondensable hydrocarbons and hydrogen. © 201
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