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Combined effect of the horizontal components of earthquakes for moment resisting steel frames
Alfredo Reyes-Salazar,José A. Juárez-Duarte,Arturo López-Barraza,Juan I. Velázquez-Dimas 국제구조공학회 2004 Steel and Composite Structures, An International J Vol.4 No.3
The commonly used seismic design procedures to evaluate the maximum effect of both horizontal components of earthquakes, namely, the Square Root of the Sum of the Squares (SRSS) and the 30- percent (30%) combination rules, are re-evaluated. The maximum seismic responses of four threedimensional moment resisting steel frames, in terms of the total base shear and the axial loads at interior, lateral and corner columns, are estimated as realistically as possible by simultaneously applying both horizontal components. Then, the abovementioned combination rules and others are evaluated. The numerical study indicates that both, the SRSS rule and the 30% combination method, may underestimate the combined effect. It is observed that the underestimation is more for the SRSS than for the 30% rule. In addition, the underestimation is more for inelastic analysis than for elastic analysis. The underestimation cannot be correlated with the height of the frames or the predominant period of the earthquakes. A basic probabilistic study is performed in order to estimate the accuracy of the 30% rule in the evaluation of the combined effect. Based on the results obtained in this study, it is concluded that the design requirements for the combined effect of the horizontal components, as outlined in some code-specified seismic design procedures, need to be modified. New combination ways are suggested.
Development of a real-time SYBR Green PCR assay for the rapid detection of Dermatophilus congolensis
Alfredo García,Remigio Martínez,José Manuel Benitez-Medina,David Risco,Waldo Luis García,Joaquín Rey,Juan Manuel Alonso,Javier Hermoso de Mendoza 대한수의학회 2013 Journal of Veterinary Science Vol.14 No.4
Methods such as real time (RT)-PCR have not been developed for the rapid detection and diagnosis of Dermatophilus (D.) congolensis infection. In the present study, a D. congolensis-specific SYBR Green RT-PCR assay was evaluated. The detection limit of the RT-PCR assay was 1 pg of DNA per PCR reaction. No cross-reaction with nucleic acids extracted from Pseudomonas aeruginosa,Mycobacterium tuberculosis, Staphylococcus aureus, or Austwickia chelonae was observed. Finally, the RT-PCR assay was used to evaluate clinical samples collected from naturally infected animals with D. congolensis. The results showed that this assay is a fast and reliable method for diagnosing dermatophilosis.
Seismic response estimation of steel buildings with deep columns and PMRF
Alfredo Reyes-Salazar,Manuel E. Soto-López,José R. Gaxiola-Camacho,Edén Bojórquez,Arturo Lopez-Barraza 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.17 No.4
The responses of steel buildings with perimeter moment resisting frames (PMRF) with medium size columns (W14) are estimated and compared with those of buildings with deep columns (W27), which are selected according to two criteria: equivalent resistance and equivalent weight. It is shown that buildings with W27 columns have no problems of lateral torsional, local or shear buckling in panel zone. Whether the response is larger for W14 or W27 columns, depends on the level of deformation, the response parameter and the structural modeling under consideration. Modeling buildings as two-dimensional structures result in an overestimation of the response. For multiple response parameters, the W14 columns produce larger responses for elastic behavior. The axial load on columns may be significantly larger for the buildings with W14 columns. The interstory displacements are always larger for W14 columns, particularly for equivalent weight and plane models, implying that using deep columns helps to reduce interstory displacements. This is particularly important for tall buildings where the design is usually controlled by the drift limit state. The interstory shears in interior gravity frames (GF) are significantly reduced when deep columns are used. This helps to counteract the no conservative effect that results in design practice, when lateral seismic loads are not considered in GF of steel buildings with PMRF. Thus, the behavior of steel buildings with deep columns, in general, may be superior to that of buildings with medium columns, using less weight and representing, therefore, a lower cost.
JOSÉ M. BELBUTE,ALFREDO M. PEREIRA 중앙대학교 경제연구소 2022 Journal of Economic Development Vol.47 No.1
We use an ARFIMA approach to develop reference scenario projections for CO2 emissions worldwide and for seven different regions. Our objective is to determine the magnitude of the policy efforts necessary to achieve the IPCC emissions reductions goals. For worldwide emissions, the aggregate policy effort required to achieve the 2050 goals is equivalent to 97.4% of 2010 emissions. This policy effort is frontloaded as about 60% of such efforts would have to occur by 2030. In order to achieve the IPCC target the policy efforts in the cases of the USA, EU(28), Russia, and Japan are lower and less frontloaded than the IPCC goals themselves. In the case of China, India and the ROW, additional policy efforts are necessary to achieve reductions in emissions of 105.0%, 156.0% and 111.4%, of the 2010 levels, respectively. In the case of India, policy efforts are not only rather severe but also rather dramatically frontloaded, as about 74% of the policy efforts would have to occur by 2030.
Final Energy Demand in Portugal: How Persistent it is and Why it Matters for Environmental Policy
Alfredo M. Pereira,José M. Belbute 한국국제경제학회 2014 International Economic Journal Vol.28 No.4
The objective of this paper is to examine the degree of persistence in final energy demand in Portugal. Our results suggest that when structural breaks are accounted for, aggregate energy demand and all of its components are stationary. Accordingly, the response to shocks is not permanent. We find, however, strong levels of persistence. Demand for electricity is the most persistent component of aggregate demand while the levels of persistence for petroleum and gas are similar and close to the aggregate level. In turn, demand for coal and biomass are also similar and the least persistent. These results have important implications for the design of macroeconomic policies. Indeed, high persistent levels mean that temporary energy shocks translate into persistent changes in energy demand and thereby in less transient shocks to the overall economy. These results are also important for the design of environmental policies. The fact that energy demand is highly persistent means that the effects of environmental policies will tend to be long lasting. Also, the relatively high persistence of electricity, gas and petroleum and the fact that their levels of persistence are similar suggests that fuel switching policies involving these fuels will be relatively easy to implement.
Raúl Alfredo Borracci,Graciana Ciambrone,José María Alvarez Gallesio 한국보건의료인국가시험원 2020 보건의료교육평가 Vol.17 No.-
Purpose: Moral courage refers to the conviction to take action on one’s ethical beliefs despite the risk of adverse consequences. Thisstudy aimed to evaluate correlations between social desirability scores and moral courage scores among medical residents and fellows,and to explore gender- and specialty-based differences in moral courage scores. Methods: In April 2018, the Moral Courage Scale for Physicians (MCSP), the Professional Moral Courage (PMC) scale and the Marlowe-Crowne scale to measure social desirability were administered to 87 medical residents from Hospital Alemán in Buenos Aires, Argentina. Results: The Cronbach α coefficients were 0.78, 0.74, and 0.81 for the Marlowe-Crowne, MCSP, and PMC scales, respectively. Correlation analysis showed that moral courage scores were weakly correlated with social desirability scores, while both moral couragescales were strongly correlated with each other. Physicians who were training in a surgical specialty showed lower moral courage scoresthan nonsurgical specialty trainees, and men from any specialty tended to have lower moral courage scores than women. Specifically, individuals training in surgical specialties ranked lower on assessments of the “multiple values,” “endurance of threats,” and “going beyondcompliance” dimensions of the PMC scale. Men tended to rank lower than women on the “multiple values,” “moral goals,” and “endurance of threats” dimensions. Conclusion: There was a poor correlation between 2 validated moral courage scores and social desirability scores among medical residents and fellows in Argentina. Conversely, both moral courage tools showed a close correlation and concordance, suggesting that thesescales are reasonably interchangeable.
Obed Cortés-Aburto,José-Alfredo Hernández-Pérez,Rafael Rojas-Rodríguez 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.8
We performed a performance assessment of a recently developed method: Lévy flight particle swarm optimization. This method, which was developed for optimization problems, has shown good results. There is not an application to inverse problems. Now, it is applied for inverse heat transfer, and results are good enough. In particular, a parameter called “limit” is analyzed for different values (from 10 to 150). It shows that performance of the method for estimating parameters in inverse problems is affected by this parameter. When limit reaches a value of 80, ordinary least squares norm and consuming time begin to exhibit better results.
An Adaptive Neural Identifier with Applications to Financial and Welding Systems
Kevin Herman Muraro Gularte,Jairo José Muñoz Chávez,José Alfredo Ruiz Vargas,Sadek Crisóstomo Absi Alfaro 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.5
This paper considers the online identification problem of uncertain systems. Based on parallel and seriesparallel configurations with feedback and by using Lyapunov arguments, a unified identification algorithm is introduced to ensure the boundedness of all associated errors and convergence of the state estimation error to an arbitraryneighborhood of the origin. The main peculiarity of the proposed algorithm lies in allowing the adjustment of theidentification transient by using parameters that are not related to the residual state error. Two examples are deemedto validate the theoretical results and show the relevance of the application of the proposed methodology for onlineweld geometry prediction.
Juan Carlos González Gómez,Kevin Herman Muraro Gularte,José Alfredo Ruiz Vargas,Rogério Rodrigues dos Santos,José Antonio Ruz Hernández 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.9
This paper presents the synchronization of a class of hyperchaotic systems using a robust underactuated approach. The proposed scheme guarantees the convergence in finite time of the slave system trajectories to the master system based on Lyapunov theory. The main novelty of the method is its simplicity resulting from the underactuated strategy and its robustness due to the presence of disturbances in the stability analysis. Simulations are presented to show the performance of the proposed method and its advantages compared with another recent study in the literature. In addition, a secure communication example is considered to illustrate the simple application of the synchronizer.