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Prediction of Micro-scale Forces in Dry Grinding Process Through a FEM—ML Hybrid Approach
Flavia Lerra,Antonio Candido,Erica Liverani,Alessandro Fortunato 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.1
Grinding process modeling represents a great challenge due to its stochastic nature. The uncertainty factor of grinding technology is mainly attributable to the undefined grain morphology, with the influence of this aspect becoming more pronounced in a dry configuration. Even though grinding has always used lubricants, nowadays the reduction or complete elimination of this element could mean a significant reduction in environmental pollution. Many modeling approaches have been used in literature to investigate phenomena related to grinding but each exhibits some disadvantages. In this paper a hybrid FEM—ML approach is proposed to forecast forces generated by the action of a single grain in dry conditions, overcoming the main modeling limitations observed to date. Experiments and force measurements were performed on a CNC surface grinding machine using sintered aluminum oxide grains of size 60. FEM simulations were developed in DEFORM 3D to predict grinding forces and increase the data set. ML algorithms were proposed to increase model prediction productivity and optimize the control of process parameters.
Flavia Adriana Zanetti,María Paula Del Médico Zajac,Oscar Alberto Taboga,Gabriela Calamante 대한수의학회 2012 JOURNAL OF VETERINARY SCIENCE Vol.13 No.2
A recombinant modified vaccinia Ankara (MVA) virus expressing mature viral protein 2 (VP2) of the infectious bursal disease virus (IBDV) was constructed to develop MVA-based vaccines for poultry. We demonstrated that this recombinant virus was able to induce a specific immune response by observing the production of anti-IBDV-seroneutralizing antibodies in specific pathogen-free chickens. Besides, as the epitopes of VP2 responsible to induce IBDV-neutralizing antibodies are discontinuous, our results suggest that VP2 protein expressed from MVA-VP2 maintained the correct conformational structure. To our knowledge, this is the first report on the usefulness of MVA-based vectors for developing recombinant vaccines for poultry.
Numerical Methodology to Predict and Analyze Cavitating Flows in a Kaplan Turbine
Flavia Turi,Regiane Fortes-Patella,Guillaume Balarac 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.4
A computational methodology to predict the cavitation phenomena appearance and evolution in a 5-blades Kaplan turbine scale model was developed. Two different inlet boundary conditions have been tested in both non-cavitating and cavitating regimes: the classical one, the mass flow rate and the new one, the total pressure. The best results were obtained applying a constant total pressure on the inlet. The torque and efficiency drop curves were well-predicted with the proposed calculation methodology and the numerical cavitation structures agreed with experimental observations. Indeed, this new inlet boundary condition allows to keep the machine head constant during the cavitation drop, as in experiments. Unsteady simulations are under investigation to improve the prediction and the analyses of more developed cavitating regimes.
Colonic Postpolypectomy Bleeding Is Related to Polyp Size and Heparin Use
Flavia Pigò,Helga Bertani,Mauro Manno,Vincenzo Giorgio Mirante,Angelo Caruso,Santi Mangiafico,Raffaele Manta,Anna Maria Rebecchi,Rita Luisa Conigliaro 대한소화기내시경학회 2017 Clinical Endoscopy Vol.50 No.3
Background/Aims: We studied factors influencing colon postpolypectomy bleeding (PPB), with a focus on antithrombotic and anticoagulation therapy. Methods: We conducted a retrospective case-control study of all patients who underwent polypectomy at our tertiary referral center in Italy between 2007 and 2014. Polyp characteristics (number of polyps removed per patient, size, morphology, location, resection technique, prophylactic hemostasis methods) and patient characteristics (age, sex, comorbidities, medication) were analyzed. Results: The case and control groups included 118 and 539 patients, respectively. The two groups differed in the frequency of comorbidities (69% vs. 40%, p=0.001), polyps removed (27% vs. 18%, p=0.02), and use of heparin therapy (23% vs. 1%, p<0.001). A total of 279 polyps in the case group and 966 in the control group were nonpedunculated (69% vs. 81%, p=0.01) and measured ≥10 mm (78% vs. 32%, p=0.001). Multivariate analysis showed that polyps ≥10 mm (odds ratio [OR], 6.1; 95% confidence interval [CI], 2.3–15.5), administration of heparin (OR, 16.5; 95% CI, 6.2–44), comorbidity (OR, 2.3; 95% CI, 1.4–3.9), and presence of ≥2 risk factors (OR, 3.2; 95% CI, 1.7–6.0) were associated with PPB. Conclusions: The incidence of PPB increases with polyp size ≥10 mm, heparin use, comorbidity, and presence of ≥2 risk factors.
Weighted composition operators between H∞ and BMOA
Flavia Colonna 대한수학회 2013 대한수학회보 Vol.50 No.1
We study the bounded and the compact weighted composition operators from the Hardy space H∞ into BMOA and into VMOA, from BMOA into H∞, as well as from BMOA into the Bloch space. We also provide new boundedness and compactness criteria for the weighted composition operators on BMOA and on VMOA
Silva Flavia Adriane de Sales,Valadares Filho Sebastião de Campos,Costa e Silva Luiz Fernando,Fernandes Jaqueline Gonçalves,Lage Bruno Corrêa,Chizzotti Mario Luiz,Felix Tara Louise 아세아·태평양축산학회 2021 Animal Bioscience Vol.34 No.4
Objective Objectives were to estimate energy and protein requirements of dairy crossbred steers, as well as to evaluate equations previously described in the literature (HH46 and CS16) to predict the carcass and empty body chemical composition of crossbred dairy cattle. Methods Thirty-three Holstein×Zebu steers, aged 19±1 months old, with an initial shrunk body weight (BW) of 324±7.7 kg, were randomly divided into three groups: reference group (n = 5), maintenance level (1.17% BW; n = 4), and the remaining 24 steers were randomly allocated to 1 of 4 treatments. Treatments were: intake restricted to 85% of ad libitum feed intake for either 0, 28, 42, or 84 d of an 84-d finishing period. Results The net energy and the metabolizable protein requirements for maintenance were 0.083 Mcal/EBW0.75/d and 4.40 g/EBW0.75, respectively. The net energy (NEG) and protein (NPG) requirements for growth can be estimated with the following equations: NEG (Mcal/kg EBG) = 0.2973(±0.1212) ×EBW0.4336(±0.1002) and NPG (g/d) = 183.6(±22.5333)×EBG−2.0693(±4.7254)×RE, where EBW, empty BW; EBG, empty body gain; and RE, retained energy. Crude protein (CP) and ether extract (EE) chemical contents in carcass, and all the chemical components in the empty body were precisely and accurately estimated by CS16 equations. However, water content in carcass was better predicted by HH46 equation. Conclusion The equations proposed in this study can be used for estimating the energy and protein requirements of crossbred dairy steers. The CS16 equations were the best estimator for CP and EE chemical contents in carcass, and all chemical components in the empty body of crossbred dairy steers, whereas water in carcass was better estimated using the HH46 equations. Objective: Objectives were to estimate energy and protein requirements of dairy crossbred steers, as well as to evaluate equations previously described in the literature (HH46 and CS16) to predict the carcass and empty body chemical composition of crossbred dairy cattle.Methods: Thirty-three Holstein × Zebu steers, aged 19 ± 1 months old, with an initial shrunk body weight of 324 ± 7.7 kg, were randomly divided into three groups: reference group (n = 5), maintenance level (1.17% BW; n = 4), and the remaining 24 steers were randomly allocated to 1 of 4 treatments. Treatments were: intake restricted to 85% of <i>ad libitum</i> feed intake for either 0, 28, 42, or 84 d of an 84-d finishing period.Results: The net energy and the metabolizable protein requirements for maintenance were 0.083 Mcal/EBW<sup>0.75</sup>/d and 4.40 g/EBW<sup>0.75</sup>, respectively. The net energy (NE<sub>G</sub>) and protein (NP<sub>G</sub>) requirements for growth can be estimated with the following equations: NE<sub>G</sub> (Mcal/kg EBG) = 0.2973<sub>(± 0.1212)</sub> × <i>EBW</i><sup>0.4336(± 0.1002)</sup> and NP<sub>G</sub> (g/d) = 183.6<sub>(± 22.5333)</sub> × EBG – 2.0693<sub>(± 4.7254)</sub> × RE, where EBW = empty body weight, EBG = empty body gain, and RE = retained energy. Crude protein (CP) and ether extract (EE) chemical contents in carcass, and all the chemical components in the empty body were precisely and accurately estimated by CS16 equations. However, water content in carcass was better predicted by HH46 equation.Conclusion: The equations proposed in this study can be used for estimating the energy and protein requirements of crossbred dairy steers. The CS16 equations were the best estimator for CP and EE chemical contents in carcass, and all chemical components in the empty body of crossbred dairy steers, whereas water in carcass was better estimated using the HH46 equations.
Ana Flavia Azevedo Carvalho,Aline Zorzetto Gonclves,Roberto da Silva,Eleni Gomes 한국미생물학회 2006 The journal of microbiology Vol.44 No.3
The thermophilic fungus Thermoascus aurantiacus 179-5 produced large quantities of a glucosidase which preferentially hydrolyzed maltose over starch. Enzyme production was high in submerged fermentation, with a maximal activity of 30 U/ml after 336 h of fermentation. In solid-state fermentation, the activity of the enzyme was 22 U/ml at 144 h in medium containing wheat bran and 5.8 U/ml at 48 h when cassava pulp was used as the culture medium. The enzyme was specific for maltose, very slowly hydrolyzed starch, dextrins (2-7G) and the synthetic substrate (α-PNPG), and did not hydrolyze sucrose. These properties suggest that the enzyme is a type II α-glucosidase. The optimum temperature of the enzyme was 70°C. In addition, the enzyme was highly thermostable (100% stability for 10 h at 60°C and a half-life of 15 min at 80°C), and stable within a wide pH range.
Donadelli Flavia M. M.,Luczak-Roesch Markus,Fischer Ronald,Li Nancy 한국행정학회 2023 International Review of Public Administration Vol.28 No.3
While the essence of leadership communication is recognized as a linchpin in crisis management, the distinct characteristics that define successful communication are often unknown. Recent perspectives on the topic highlight the importance of incorporating political and value-based considerations to achieve a balanced communication style during a crisis. This article empirically tests these claims by examining whether an evidence-inclusive communication style of leadership tends to yield more successful outcomes in crisis management. We compare speeches by leaders from Portugal, Brazil, the United States, and New Zealand, to assess the main explicit knowledge and value bases of decision-making. Our findings suggest that success of a crisis response is associated with a leader’s ability to effectively communicate an evidencebased narrative, inclusive of different evidence sources, when tackling pressing and complex issues such as the COVID-19 pandemic.