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Collapse behaviour in reciprocal frame structures
Elsa Garavaglia,Attilio Pizzigoni,Luca Sgambi,Noemi Basso 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.4
“Reciprocal Frame” refers to a self-supporting grid structure used both for floor and roof. Using Finite Element Methods for non-linear solid mechanics and frictional-contact, this paper intends to analytically and numerically investigate the collapse behaviour of a reciprocal frame structure made of fibrereinforced concrete. Considering a simple 3-beam structure, it has been investigated using a solid finite element model. Once defined the collapse behaviour of the simple structure, the analysis has been generalized using a concentrated plasticity finite element method. Results provided will be useful for studying generic reciprocal frame structures with several beams.
Collapse behaviour in reciprocal frame structures
Garavaglia, Elsa,Pizzigoni, Attilio,Sgambi, Luca,Basso, Noemi Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.4
"Reciprocal Frame" refers to a self-supporting grid structure used both for floor and roof. Using Finite Element Methods for non-linear solid mechanics and frictional-contact, this paper intends to analytically and numerically investigate the collapse behaviour of a reciprocal frame structure made of fibre-reinforced concrete. Considering a simple 3-beam structure, it has been investigated using a solid finite element model. Once defined the collapse behaviour of the simple structure, the analysis has been generalized using a concentrated plasticity finite element method. Results provided will be useful for studying generic reciprocal frame structures with several beams.
Jiyong Woo,Belmonte, Attilio,Redolfi, Augusto,Hyunsang Hwang,Jurczak, Malgorzata,Goux, Ludovic IEEE 2016 IEEE electron device letters Vol.37 No.2
<P>In this letter, we experimentally investigate data retention in a copper (Cu)-based conductive bridge random-access memory device at a low current regime (10 mu A) in which retention is governed by factors other than just the conductive filament. Our findings show that the retention characteristics are determined by the local chemical potential of Cu between the conductive filament and its surrounding medium. Furthermore, the retention tendencies are described by the electrochemical reaction in accordance with the potential difference of Cu ions. Therefore, an appropriate quantity of Cu ions around the filament is important for achieving thermally reliable high and low resistance states over time.</P>
Mohammad Hadi Dehghani,Aliakbar Dehghan,Hossein Alidadi,Maryam Dolatabadi,Marjan Mehrabpour,Attilio Converti 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
The adsorption of methylene blue dye (MBD) from aqueous solutions was investigated using a new composite made up of shrimp waste chitosan and zeolite as adsorbent. Response surface methodology (RSM) was used to optimize the effects of process variables, such as contact time, pH, adsorbent dose and initial MBD concentration on dye removal. The results showed that optimum conditions for removal of MBD were adsorbent dose of 2.5 g/L and pH of 9.0, and initial MBD concentration of 43.75mg/L and contact time of 138.65 min. The initial concentration of dye had the greatest influence on MBD adsorption among other variables. The experimental data were well fitted by the pseudo-second order kinetic model, while the Freundlich isotherm model indicated a good ability for describing equilibrium data. According to this isotherm model, maximum adsorption capacity of the composite was 24.5mg/g. Desorption studies showed that the desorption process is favored at low pH under acidic conditions.
PHENOLIC ANTIOXIDANT CONTENT OF OLIVE OILS AND THEIR POTENTIAL IN THE PREVENTION OF CANCER
Robert W. Owen,Bertold Spiegelhalder,Roswitha Haubner,Gerd Wiirtele,Attilio Giacosa,Helmut Bartsch 한국식품영양과학회 2001 한국식품영양과학회 학술대회발표집 Vol.50 No.-
The traditional (European) Mediterranean diet is characterized by an abundance of plant foods such as bread, pasta, vegetables, salad, legumes, fruit, nuts; olive oil as the principal source of fat; low to moderate amounts of fish, poultry, dairy products and eggs; only small amounts of red meat; low to moderate amounts of wine, normally consumed with meals. This diet is low in saturated fatty acids, rich in carbohydrate and fibre, and has a high content of monounsaturated fatty acids (MUFA). These are primarily derived from olive oil. Despite a wealth of general knowledge concerning the major classes of compounds present in olives and olive oil, detailed knowledge of the phenolic antioxidant content has been lacking. Therefore the aim of the study was to evaluate the phenolic antioxidant content in a range of olive and seed oils. While seed oils were devoid, on average, the olive oils contained 196 ± 19 ㎎/㎏ total phenolics as judged by HPLC analysis, but the value for extravirgin(232 ± 15 ㎎/㎏) was significantly higher than that ofrefmed virgin olive oil (62 ± 12 ㎎/㎏; P < 0.0001). Appreciable quantities of simple phenols (hydroxytyrosol and tyrosol) were detected in olive oils, with significant differences between extravirgin (41.87 ± 6.17) and refined virgin olive oils (4.72 ± 2.15; P < 0.01). The major linked phenols were secoiridoids and lignans. Although extravirgin contained higher concentrations of secoiridoids (27.72 ± 6.84) than refined olive oils (9.30 ± 3.81) this difference was not significant. On the other hand the concentration of lignans was significantly higher (P < 0.001) in extravirgin (41.53 ± 3.93) compared to refined virgin olive oils (7.29 ± 2.56). All classes of phenolics were shown to be potent antioxidants. In future epidemiolgic studies, both the nature and source of olive oil consumed should be differentiated in ascertaining cancer risk.
Carolina A. Lima,José L. Lima Filho,Benício B. Neto,Attilio Converti,Maria G. Carneiro da Cunha,Ana L. F. Porto 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.3
A 2^4 full factorial design was used to identify the main effects and interactions of the initial medium pH, soybean flour concentration, temperature and orbital agitation speed on extracellular collagenase production by Penicillium aurantiogriseum URM4622. The most significant variables for collagenase production were soybean flour concentration and initial medium pH that had positive main effects, and temperature that had a negative one. Protein concentration in soybean flour revealed to be a significant factor for the production of a collagenase serine proteinase. The most favorable production conditions were found to be 0.75% soybean flour, pH 8.0, 200 rpm, and 28ºC, which led to a collagenase activity of 164 U. The enzyme showed an optimum activity at 37℃ and pH 9.0,was stable over wide ranges of pH and temperature (6.0 ~10.0 and 25 ~ 45℃, respectively) and was strongly inhibited by 10 mM phenylmethylsulphonylfluoride. The firstorder rate constants for collagenase inactivation in the crude extract, calculated from semi-log plots of the residual activity versus time, were used in Arrhenius and Eyring plots to estimate the main thermodynamic parameters of thermoinactivation (E^*_d = 107.4 kJ/mol and ΔH^*_d = 104.7kJ/mol). The enzyme is probably an extracellular neutral serine collagenase effective on azocoll, gelatin and collagen decomposition.
Renan Rodrigues de Oliveira Silva,Paulo Victor Cuesta Calvo,Christian Adrian Merfels,Mikael Vitor Rodrigues Lima,Harrson S. Santana,Attilio Converti,Mauri Sergio Alves Palma 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Continuous flow synthesis in microreactors has been integrated into chemical-pharmaceutical industryin recent years as an alternative to the batch process due to its advantages, especially process intensification,which can reduce the time for a new drug to be placed on the market on a large scale. This workaimed to transpose the synthesis of Lobeglitazone, a drug employed in the treatment of diabetes mellitustype 2, from batch to flow process in a microreactor as well as to determine the reaction kinetics of eachstep. The synthesis was carried out in five-steps, being synthesized intermediates 4-chloro-6-(4-methoxyphenoxy)pyrimidine (I1), 2-{[6-(4-methoxyphenoxy)pyrimidin-4-yl]methylamino}ethanol (I2), 4-(2-{[6-(4-methoxyphenoxy)pyrimidin-4-yl]methylamino}ethoxy)benzaldehyde (I3), 5-[4-(2-{[6-(4-methoxyphenoxy)pyrimidin-4-yl]methylamino}ethoxy)benzylidene]thiazolidine-2,4-dione (I4) andLobeglitazone. Intermediates I1 and I4 were synthesized in flow, while I4 was synthesized either in a continuousflow multistep synthesis or in a one-pot batch process. The flow syntheses of I1, I2 and I4 showed28.0 %, 61.8 % and 32.0 % yields at 25, 160 and 120 C, respectively, while the yield of I3 in batch processwas 73.3 % at 60 C. In one-pot batch process and continuous flow multistep synthesis, I2 was obtainedwith 13 and 16 % yields, respectively. These preliminary results constitute a starting point for the synthesisof this drug in flow on an industrial scale, with the aim of improving reaction performance using thisnew technology.
Daniela Bulgari,Paola Casati,Lorenzo Brusetti,Fabio Quaglino,Milena Brasca,Daniele Daffonchio,Piero Attilio Bianco 한국미생물학회 2009 The journal of microbiology Vol.47 No.4
Diversity of bacterial endophytes associated with grapevine leaf tissues was analyzed by cultivation and cultivation-independent methods. In order to identify bacterial endophytes directly from metagenome, a protocol for bacteria enrichment and DNA extraction was optimized. Sequence analysis of 16S rRNA gene libraries underscored five diverse Operational Taxonomic Units (OTUs), showing best sequence matches with γ-Proteobacteria, family Enterobacteriaceae, with a dominance of the genus Pantoea. Bacteria isolation through cultivation revealed the presence of six OTUs, showing best sequence matches with Actinobacteria, genus Curtobacterium, and with Firmicutes genera Bacillus and Enterococcus. Length Heterogeneity-PCR (LH-PCR) electrophoretic peaks from single bacterial clones were used to setup a database representing the bacterial endophytes identified in association with grapevine tissues. Analysis of healthy and phytoplasma- infected grapevine plants showed that LH-PCR could be a useful complementary tool for examining the diversity of bacterial endophytes especially for diversity survey on a large number of samples.