Evaluation of continuously mixed reactor configurations in the oxidative-adsorptive desulfurization of diesel fuel: Optimization and parametric studies

de Luna, Mark Daniel G.,Futalan, Cybelle M.,Dayrit, Raymond A.,Choi, Angelo Earvin S.,Wan, Meng-Wei Elsevier 2018 Journal of Cleaner Production Vol.203 No.-

<P><B>Abstract</B></P> <P>In this study, oxidative-adsorptive desulfurization technology was applied to raw diesel containing 1480.4 ppm sulfur. For oxidative desulfurization, the oxidant and catalyst were hydrogen peroxide and phosphotungstic acid, respectively. Two types of continuously mixed reactors: (1) continuous stirred tank reactor (CSTR) and (2) in-line mixer were evaluated under varying reaction temperature, mixing speed and diesel flow rate. For the in-line mixer system, the mixer speed and the flow rates for diesel and oxidant were modeled and optimized using Box-Behnken design of the response surface methodology. Optimization of process parameters resulted in sulfur removal of 85.90% at 18,000 rpm mixer speed, 500 mL min<SUP>−1</SUP> diesel flow rate and 300 mL min<SUP>−1</SUP> H<SUB>2</SUB>O<SUB>2</SUB> flow rate. In the subsequent adsorptive desulfurization experiments, continuous fixed-bed adsorption using alumina removed 92.81% sulfur from treated diesel fuel thereby producing low-sulfur diesel that is within the allowable limit of Euro IV standard.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In-line mixer has better removal efficiency of sulfur from diesel over CSTR. </LI> <LI> Oxidative-adsorptive desulfurization achieved 92.81% sulfur removal. </LI> <LI> Oxidative-adsorptive desulfurization achieved residual sulfur of 30 ppm. </LI> </UL> </P>

Proof tests of REBCO coated conductor tapes for device applications through electromechanical property assessment at 77 K

Mark Angelo Diaz,Michael De Leon,Hyung-Seop Shin,Ho-Sang Jung,Jaehun Lee 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.3

The practical application of REBCO coated conductor (CC) tapes, vital for energy transmission (e.g., cable application) and high-field magnets (e.g., coil application), necessitates efficient and simple quality assessment procedures. This study introduces a systematic approach to assess the electromechanical properties of REBCO CC tapes under 77 K and self-field conditions. The approach involves customized tensile and bending tests that clarify the critical current (Ic) response of the CC tapes under mechanical loads induced by tension and bending. This study measures the retained Ic values of commercially available GdBCO CC tapes under 250 MPa tensile stress and 40 mm bending diameter. Through experimentation, the study demonstrates the resilience of these tapes and their suitability for applications. By presenting a simplified stress-based analysis and a bending test of the tapes, the study contributes to effective quality assessment methods for the development of practical superconducting products.

Procedural steps for reliability evaluation of ultrasonically welded REBCO coated conductor lap-joints under low cycle fatigue test condition

Michael De Leon,Mark Angelo Diaz,Hyung-Seop Shin 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.4

This study presents a comprehensive procedure for the low cycle fatigue test of ultrasonically welded (UW) coated conductor (CC) lap-joints. The entire process is examined in detail, from the robust fabrication of the UW REBCO CC joints to the reliability testing under a low number of repeated cycle fatigue conditions. A continuous Ic measurement system enables real-time monitoring of Ic variations throughout the fatigue tests. The study aims to provide a step-by-step procedure that involves joint fabrication, electromechanical property (EMP) tests under uniaxial tension for stress level determination, and subsequent low-cycle fatigue tests. The joints are fabricated using a hybrid method that combines UW with adding In-Sn soldering, achieving a flux-free hybrid welding approach (UW-HW flux-free). The selected conditions for the low cycle fatigue tests include a stress ratio of R=0.1 and a frequency of 0.02 Hz. The results reveal some insights into the fatigue behavior, irreversible changes, and cumulative damage in the CC joints.

Claritromycin Resistance and Helicobacter pylori Genotypes in Italy

Vincenzo De Francesco,Marcella Margiotta,Cesare Hassan,Nicola Della Valle,Osvaldo Burattini,Roberto D’Angelo,Giuseppe Stoppino,Ugo Cea,Floriana Giorgio,Rosa Monno,Sergio Morini,Carmine Panella,Enzo Ie 한국미생물학회 2006 The journal of microbiology Vol.44 No.6

The relationship between H. pylori clarithromycin resistance and genetic pattern distribution has been differently explained from different geographic areas. Therefore, we aimed to assess the clarithromycin resistance rate, to evaluate the bacterial genetic pattern, and to search for a possible association between clarithromycin resistance and cagA or vacA genes. This prospective study enrolled 62 consecutive H. pylori infected patients. The infection was established by histology and rapid urease test. Clarithromycin resistance, cagA and vacA status, including s/m subtypes, were assessed on paraffin-embedded antral biopsy specimens by TaqMan real time polymerase chain reaction (PCR). Primary clarithromycin resistance was detected in 24.1% of cases. The prevalence of cagA was 69.3%, and a single vacA mosaicism was observed in 95.1% cases. In detail, the s1m1 was observed in 23 (38.9%) patients, the s1m2 in 22 (37.2%), and the s2m2 in 14 (23.7%), whereas the s2m1 combination was never found. The prevalence of cagA and the vacA alleles distribution did not significantly differ between susceptible and resistant strains. Primary clarithromycin resistance is high in our area. The s1m1 and s1m2 are the most frequent vacA mosaicisms. There is no a relationship between clarithromycin resistance and bacterial genotypic pattern and/or cagA positivity.

Climate Change Effects on the Suitability of an Agricultural Area to Maize Cultivation: a New Land Evaluation Hybrid System for Maize

Antonello Bonfante,Angelo Basile,Silvia Maria Alfieri,Eugenia Monaco,Francesca De Lorenzi 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

THERMODYNAMIC ANALYSIS OF SINGLE- AND DOUBLE-EFFECT ABSORPTION REFRIGERATION SYSTEMS FOR COOLING ETHANOL FERMENTATION PROCESS

HUGO VALENÇA DE ARAÚJO,JOSÉ VICENTE HALLAK D'ANGELO 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.4

Alcoholic fermentation is one of the most important stages in industrial ethanol productionprocess, involving a biochemical and exothermic reaction. Sometimes cooling towers are notcapable of supplying a cold utility with a temperature low enough to maintain the fermentativemedium temperature in a desirable range. Absorption Refrigeration Systems (ARS) appears to bea good alternative to obtain the necessary refrigeration for the fermentation process. The aim ofthe present paper was to carry out a thermodynamic analysis of ARS, evaluating their performancethrough the First and Second Laws of Thermodynamics. ARS with different con¯gurationswere studied (single-effect and double-effect with series, parallel and reverse parallel flows), all ofthem operating with water/lithium bromide mixture as working pair, under different operatingconditions in order to satisfy the cooling load required by an industrial alcoholic fermentationprocess. Another objective of this paper was to investigate the risk of LiBr crystallization, whichcan result in scaling formation, with the aid of the solid–liquid phase equilibrium curve of H2O/LiBr mixture. Among the double-effect con¯gurations studied, it was observed that series flow presents the more signi¯cant crystallization risk, which represents a limit to improve its First andSecond Law performances. It was veri¯ed that the Second Law performance for the single-anddouble-effect ARS analyzed are similar, but their First Law performance are considerably different. This is due to the amount and quality of the heat consumed in the first effect generators ofthese systems. For a base case studied, First Law performance measured by coefficient of performance(COP) of double-effect ARS is 72% greater than the one for single-effect, while forSecond Law performance, measured by exergetic efficiency, an increase of 5% was observed.

Endoscopic clipping in non-variceal upper gastrointestinal bleeding treatment

Giuseppe Galloro,Angelo Zullo,Gaetano Luglio,Alessia Chini,Donato Alessandro Telesca,Rosa Maione,Matteo Pollastro,Giovanni Domenico De Palma,Raffaele Manta 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.3

Since the earliest reports, advanced clipping systems have been developed, and it is possible to choose among many models with differentstructural and technical features. The main drawback of through-the-scope clips is their small size, which allows the compressionof limited amounts of tissue needed for large-size vessel treatment. Therefore, the over-the-scope clip system was realized, allowing alarger and stronger mechanical compression of large tissue areas, with excellent results in achieving a definitive hemostasis in difficultcases. Many studies have analyzed the indications and efficacy of two-pronged endoclips and have shown good results for initial andpermanent hemostasis. The aim of this review was to provide updated information on indications, positioning techniques, and resultsof clip application for endoscopic treatment of upper gastrointestinal non-variceal bleeding lesions.

Claritromycin Resistance and Helicobacter pylori Genotypes in Italy

Francesco Vincenzo De,Margiotta Marcella,Zullo Angelo,Hassan Cesare,Valle Nicolar Della,Burattini Osvaldo,D'Angel Roberto,Stoppino Giuseppe,Cea Ugo,Giorgio Floriana,Monno Rosa,Morini Sergio,Panella Ca The Microbiological Society of Korea 2006 The journal of microbiology Vol.44 No.6

The relationship between H. pylori clarithromycin resistance and genetic pattern distribution has been differently explained from different geographic areas. Therefore, we aimed to assess the clarithromycin resistance rate, to evaluate the bacterial genetic pattern, and to search for a possible association between clarithromycin resistance and cagA or vacA genes. This prospective study enrolled 62 consecutive H. pylori infected patients. The infection was established by histology and rapid urease test. Clarithromycin resistance, cagA and vacA status, including s/m subtypes, were assessed on paraffin-embedded antral biopsy specimens by TaqMan real time polymerase chain reaction (PCR). Primary clarithromycin resistance was detected in 24.1 % of cases. The prevalence of cagA was 69.3%, and a single vacA mosaicism was observed in 95.1 % cases. In detail, the s1m1 was observed in 23 (38.9%) patients, the s1m2 in 22 (37.2%), and the s2m2 in 14 (23.7%), whereas the s2m1 combination was never found. The prevalence of cagA and the vacA alleles distribution did not significantly differ between susceptible and resistant strains. Primary clarithromycin resistance is high in our area. The s1m1 and s1m2 are the most frequent vacA mosaicisms. There is no a relationship between clarithromycin resistance and bacterial genotypic pattern and/or cagA positivity.

Dynamic response of a linear two d.o.f system visco-elastically coupled with a rigid block

Di Egidio, Angelo,Pagliaro, Stefano,Fabrizio, Cristiano,de Leo, Andrea M. Techno-Press 2019 Coupled systems mechanics Vol.8 No.4

The present work investigates the use of a rigid rocking block as a tool to reduce vibrations in a frame structure. The study is based on a simplified model composed by a 2-DOF linear system, meant to represent a general M-DOF frame structure, coupled with a rocking rigid block through a linear visco-elastic device, which connects only the lower part of the 2-DOF system. The possibility to restrain the block directly to the ground, by means of a second visco-elastic device, is investigated as well. The dynamic response of the model under an harmonic base excitation is then analysed in order to evaluate the effectiveness of the coupling in reducing the displacements and the drift of the 2-DOF system. The nonlinear equations of motion of the coupled assemblage 2-DOF-block are obtained by a Lagrangian approach and then numerically integrated considering some reference mechanical and geometrical quantities as variable parameters. It follows an extensive parametric analysis, whose results are summarized through behaviour maps, which portray the ratio between the maximum displacements and drifts of the system, with and without the coupling with the rigid block, for several combinations of system's parameters. When the ratio of the displacements is less than unity, the coupling is considered effective. Results show that the presence of the rocking rigid block improves the dynamics of the system in large ranges of the characterizing parameters.

Comparison of Dental Carcass Maturity in Non-Castrated Male F1 Angus-Nellore Cattle Finished in Feedlot

Bismarck Moreira Santiago,Welder Angelo Baldassini,Laí,s de Aquino Tomaz,Leone Campos Rocha,Wellington Bizarria dos Santos,Rogé,rio Abdallah Curi,Luis Artur Loyola Chardulo,Otá,vio Rodrigu 한국축산식품학회 2021 한국축산식품학회지 Vol.41 No.3

Dental classification of carcasses is used as a parameter of cattle maturity at slaughter, and it can influence carcass and meat quality traits. Brazilian beef-packing companies use the number of permanent incisor (PI) teeth as a parameter for bonus and certification of carcasses with superior quality. However, when non-castrated male such as F1 Angus-Nellore (Bos taurus×Bos indicus) are slaughtered, only animals without PI teeth are subsidized by the breed association. We evaluated these animals finished in feedlot for 180 days with zero versus two PI teeth on the carcass and meat quality traits. At the time of slaughter, 88 carcasses were selected, forming two treatments according to dental carcass maturity (0 versus 2 PI teeth; 44 animals per category). It was demonstrated that the number of PI teeth (0 versus 2 PI) did not influence (p>0.05) carcass (weights, yield, cooling loss, ribeye area and the backfat thickness) and meat quality traits (Longissimus thoracis chemical composition, color, cooking losses, shear force and pH). Thus, dental carcass maturity (zero versus two PI teeth) does not influence non-castrated male F1 Angus-Nellore finished in feedlot for 180 days. This is the first study to demonstrate that carcasses of non-castrated male F1 Angus-Nellore with two PI teeth should be subsidized in a similar way to those with zero PI teeth. Moreover, Brazilian beef-packing companies could produce heavier and leaner carcasses of acceptable quality though the use of crossbred cattle such as non-castrated F1 Angus Nellore.