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Constanza Pulido 계명대학교 국제학연구소 2013 국제학논총 Vol.20 No.-
Forced internal migration in Colombia is an issue that has affected this country for decades. The causes are diverse (internal armed conflict, violence, drug trafficking to name but a few) and the consequences are devastating for the civilian population. These events have a considerable impact on literature as well, giving rise to testimonial narratives and migration literature. These aim to denounce an historic event through the words of the individuals who are directly witnessing the unfolding of these events. The colombian novel “A Tale of the Dispossessed” written by Laura Restrepo, is considered a novel about displacement and migration. Here we will review some dichotomies of the condition of the displaced and how it allows them to become aware of their own identity.
Global Set Point Robust Regulation for a PVTOL Vehicle With Bounded Inputs
G. Obregon-Pulido,J. A. Meda-Campana,G. Solis-Perales,Castillo-Toledo 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
A design procedure to robustly globally stabilize the Planar Vertical Take Off and Landing (PVTOL) around a position by means of bounded control law and without knowledge of the velocities is presented. The methodology is based on the use of saturation functions bounding the thrust and the roll inputs. To this purpose the techniques given in [13]-[14] (making use of the full state) are enriched with the design of an observer for the nominal system. The algorithm is simple and provides global robust convergence to the reference constant signals.
Eder Uzziel Pulido Barragán,Carlos Fernando Castro Guerrero,Ana María Zamudio,Ana Beatriz Morales Cepeda,Thomas Heinze,Andreas Koschella 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
Cellulose nanocrystals (CNC) were obtained from Typha domingensis (an invasive macrophyte) collected fromlagoons and wetlands in Altamira, Mexico. Cellulose extraction was carried out by a treatment with aqueous NaOH in a batchreactor followed by NaClO-bleaching and subsequent hydrolysis with sulfuric acid. The fibers were characterized by FourierTransform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electronmicroscopy (SEM), and atomic force microscopy (AFM). The crystallinity of the cellulose fibers isolated from Typhadomingensis increased from 29 % (not treated fibers) to 73 % and the beginning of thermal degradation increased from 246 oCto 312 oC before and after the bleaching. The CNCs isolated from this plant show average values of 20 nm in diameter and 190 nmin length. Micrographs of the Typha domingensis fibers and the cellulose isolated therefrom as well as bleached celluloseindicate the removal of hemicellulose, lignin, and waxes from the fibers, which corroborates the XRD and FTIR results.
J.M. Ochando-Pulido,V. Verardo,A. Segura-Carretero,A. Martinez-Ferez 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
In this work, the resistances-in-series plus critical flux models are used as a simple but efficient tool inorder to describe and predict the dynamic performance of a reverse osmosis membrane process, aimedfor the tertiary treatment of two-phase olive mill wastewater (OMW2ST). To overcome the uncertaintyof fouling, engineers overdesign the membrane plants by using wide safety margins that trigger the costssensibly. One approach to answer the investor’s need to trust membrane technology is to guarantee thatfouling will be strongly inhibited or avoided. Within this context, concentration polarization and foulingcould be accurately addressed by the applied models. Similar concentration polarization and foulingbuild-up rate on the selected membrane was found in the operating pressure range 15–25 bar(1.20 10 1–1.41 10 1 h 1), but increased over 5 times (6.42 10 1 h 1) upon incrementing thetransmembrane pressure up to 35 bar. Moreover, concentration polarization decreased 22.6% and thefouling build-up rate became reduced 45.5% with an increase of the crossflow up to 5.09 m s 1 uponnegligible energy penalty, also avoiding irreversible fouling. Finally, significantly minor fouling (52.5–56.2% reduction) was attained at the lowest temperature, regularly experienced during the olive oilproduction campaign.
Marco Stoller,Javier Miguel Ochando Pulido,Luca Di Palma,Antonio Martinez Ferez 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
In this work, the benefit of using photocatalysis as a pretreatment step for a subsequent olive millwastewater (OMW) treatment process by membranes will be discussed. Membrane processes appear to be suitable to purify aqueous wastewater streams polluted by organicmatter such as OMW, but suffer severe fouling. In order to avoid fouling, the use of operating conditionsbelow the boundary flux is suggested. The problem is that in many cases, boundary flux values areextremely low, making the process economically not feasible. In order to overcome this limitation,pretreatment steps are necessary to increase boundary flux values accordingly. Photocatalysis appears tobe capable to achieve these requirements: on one hand, the process is capable to reduce the organic loadof the feedstock and on the other hand, particle size distributions of the suspended organic matter arechanged. Both principles are known in literature to lead to boundary flux value changes. In this paper the authors report the obtained results of the experimental work concerningphotocatalysis and membrane performances.
Marıa Dolores Vıctor-Ortega,Javier Miguel Ochando Pulido,Diego Airado-Rodrıguez,Antonio Martı´nez-Ferez 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
The final purification of two-phase olive mill wastewater (OMW-2) by ion exchange (IE) was addressed. This pollutant effluent was previously subjected to Pseudo-Fenton secondary treatment. Consequently,OMW-2 presented high concentrations of chloride, sodium, phenols and iron, which hinder its discharge. Experimental design was used to optimize the IE process. Around 88% removal efficiencies of thesepollutants were achieved when initial pH, temperature and flow rate were 5.1, 26.8 8C and 12.1 L h 1,respectively. Finally, 28 L treated water could be accomplished in continuous mode under optimalconditions, complying with standards for reuse in the olive oil production process.
Food Hypersensitivity in Mexican Adults at 18 to 50 Years of Age: A Questionnaire Survey
Martín Bedolla-Barajas,Tonatiuh Ramses Bedolla-Pulido,Alan Salvador Camacho-Peña,Estefanía González-García,Jaime Morales-Romero 대한천식알레르기학회 2014 Allergy, Asthma & Immunology Research Vol.6 No.6
Purpose: There is limited epidemiological evidence of food hypersensitivity (FH) in the adult population. We aimed to determine the prevalence of FH in Mexican adults, their clinical features and to establish common food involved in its appearance. Methods: We designed a cross-sectional study using a fixed quota sampling; 1,126 subjects answered a structured survey to gather information related to FH. Results: The prevalence of FH in adults was 16.7% (95% CI, 14.5% to 18.8%), without statistical significant differences related to gender (women, 17.5% and men, 15.9%) or residential location. The most common clinical manifestations in adults with FH were oral allergy syndrome (70 of 1,126) and urticaria (55 of 1,126). According to category, fruits and vegetables were the most frequent foods to trigger FH (6.12%) and were individually related to shrimp (4.0%), and cow milk (1.5%). Adults under age 25 had a higher frequency of FH (OR, 1.39; 95% CI, 1.01 to 1.91, P <0.001). Personal history of any atopic disease was significantly associated with FH (P <0.0001). Conclusions: The prevalence of FH is relatively high in Mexican adults, and FH is significantly associated with atopic diseases.
Computational modeling of cracking of concrete in strong discontinuity settings
J. Oliver,A. Huespe,M.D.G. Pulido,S. Blanco 한국계산역학회 2004 Computers and Concrete, An International Journal Vol.1 No.1
The paper is devoted to present the Continuum Strong Discontinuity Approach (CSDA) and to examine its capabilities for modeling cracking of concrete. After introducing the main ingredients of the CSDA, an isotropic continuum damage model, which distinguishes tension and compression states, is used to implicitly induce a projected traction separation-law that rules the cracking phenomena. Criteria for onset and propagation of material failure and specific finite elements with embedded discontinuities are also briefly sketched. Finally, some representative numerical simulations of cracking, in plain and reinforced concrete specimens, using the CSDA are presented.