Multilateral Tariff Negotiations when Production is Fixed

( Mendez Naya,Jose ),( Mendez Naya,Luciano ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2002 Journal of Economic Integration Vol.17 No.4

This paper contributes to analysis of the extent to which multilateral trading agreements reached under GATT can liberalize the world economy. Its main conclusion is that free trade is not sustainable if production is fixed exogenously and utility is non-transferable. If production is fixed and utility is transferable, free trade is possible but is not necessary for maximization of welfare.

Essential oil impregnation into graphene sponges with electric desorption control

Mendez, Jose Antonio Cabello,Bueno, Jose de Jesus Perez,Valencia, Jorge Ivan Mendoza,Soto, Jonathan Soto,Lopez, Maria Luisa Mendoza,Guerrero, Mizraim Uriel Flores Techno-Press 2022 Advances in nano research Vol.12 No.6

This work shows the impregnation of scents using a graphene sponge (GS). This was functionalized by the modified Hummers method, pursuing to add different functional groups. It is proposed to achieve the release and seek to control it through electrical potential applied to the graphene sponge with essential oils. The graphene sponge was functionalized and steeped with two kinds of oil. The electrochemical study demonstrates the variation in the electrochemical behaviour of the functionalized graphene sponge without and impregnated with oil. The release of the oil and its aromatic scents was carried out by applying an electrical potential of 30 V, with a release rate of 1.86 mg/min. The heating of the sample that causes the release of oil, associated with the electrical resistance of the system, reaches temperatures of about 150℃. The essential oils, graphene sponge, surfactant, graphene sponge with essential oils, graphene sponge recuperated after applying electric potential, graphene sponge recovered by temperature and dipropylene glycol (DPG) were characterized using Fourier transformed infrared spectroscopy (FTIR), digital microscopy, and x-ray photoelectron spectroscopy (XPS).

THE FINITE HANKEL-SCHWARTZ TRANSFORM

MENDEZ, J.M. Korean Mathematical Society 1989 대한수학회지 Vol.26 No.1

Mixed Oligopoly and Foreign Direct Investment

Méndez Naya, José 한국국제경제학회 2010 International Economic Journal Vol.24 No.1

By using a mixed duopoly model, this paper analyses the effects of domestic firm ownership status on foreign direct investment decisions. It is shown that, although public ownership can be understood as a protectionist device, foreign direct investment can only be an equilibrium strategy if the level of privatization of the domestic economy is high enough. Furthermore it is proved that foreign direct investment is harmful from a home welfare point of view.

Nanoscale aggregation phenomena at the contact line of air-drying pure water droplets on silicon revealed by atomic force microscopy

A. Méndez-Vilas,A.B. Jódar-Reyes,J. Díaz,M.L. González-Martín 한국물리학회 2009 Current Applied Physics Vol.9 No.1

In the present work, silicon wafer surfaces were studied during a pure water dewetting process in ambient conditions by intermittentcontact atomic force microscopy (AFM). With an acid-free surface cleaning, large network structures of tens of microns in extension but only a few nanometers in height were observed, being stable for days. Fractal-like assemblies have been previously reported in a variety of different scenarios, for example, when an aqueous solution of carbon-based species, especially carbon nanotubes, is left to evaporate on a solid substrate, provided that no complete wetting was produced. Chemical mapping of silicon wafer surfaces, while unable to provide a spatial resolution comparable to that of the AFM, clearly showed the initially formed contact line to be enriched in carbon. Therefore, hydrophobic and/or non-soluble (or slightly soluble) substances which are present on every surface exposed to air are expected to be responsible for the observed fractal structures. Reactions of the network structures toward changing environmental conditions were analyzed. When increasing the ambient humidity, the structures grew only slightly, which is indicative of their highly (but not totally) hydrophobic nature. Heating the sample above 100 ℃ for about 10 h led to an almost complete disappearance of these nanostructures. Due to the lateral extension of these stable network heterogeneities, they are expected to affect contact angle measurements in wetting studies, especially at the micro- and nanoscale. When acid-cleaned wafers are used as substrate, deposited water extends as a film over the silicon surface without droplet formation. No fractal structures are then observed. In the present work, silicon wafer surfaces were studied during a pure water dewetting process in ambient conditions by intermittentcontact atomic force microscopy (AFM). With an acid-free surface cleaning, large network structures of tens of microns in extension but only a few nanometers in height were observed, being stable for days. Fractal-like assemblies have been previously reported in a variety of different scenarios, for example, when an aqueous solution of carbon-based species, especially carbon nanotubes, is left to evaporate on a solid substrate, provided that no complete wetting was produced. Chemical mapping of silicon wafer surfaces, while unable to provide a spatial resolution comparable to that of the AFM, clearly showed the initially formed contact line to be enriched in carbon. Therefore, hydrophobic and/or non-soluble (or slightly soluble) substances which are present on every surface exposed to air are expected to be responsible for the observed fractal structures. Reactions of the network structures toward changing environmental conditions were analyzed. When increasing the ambient humidity, the structures grew only slightly, which is indicative of their highly (but not totally) hydrophobic nature. Heating the sample above 100 ℃ for about 10 h led to an almost complete disappearance of these nanostructures. Due to the lateral extension of these stable network heterogeneities, they are expected to affect contact angle measurements in wetting studies, especially at the micro- and nanoscale. When acid-cleaned wafers are used as substrate, deposited water extends as a film over the silicon surface without droplet formation. No fractal structures are then observed.

Effect of Irvingia gabonensis on Metabolic Syndrome, Insulin Sensitivity, and Insulin Secretion

Miriam Mendez-del Villar,Manuel Gonzalez-Ortiz,Esperanza Martınez-Abundis,Karina G. Perez-Rubio,Marisol Cortez-Navarrete 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.6

The aim of this study was to evaluate the effect of Irvingia gabonensis on metabolic syndrome (MetS), insulin sensitivity, and insulin secretion. A randomized, double-blind, placebo-controlled clinical trial was performed in 24 patients with MetS in accordance with the International Diabetes Federation criteria. Twelve patients received I. gabonensis (150 mg) twice a day during 90 days, and 12 patients received placebo. Glucose and insulin concentrations were measured during a 2-h oral glucose tolerance test. Also, lipid profile, creatinine, uric acid, and hepatic enzymes were determined. The area under the curve (AUC) of glucose and insulin, total insulin secretion, first phase of insulin secretion, and insulin sensitivity were calculated. Data were tested using non-parametric tests. The Ethics Committee approved the protocol. After I. gabonensis administration, significant decreases in waist circumference (WC) (94.0 ± 8.0 vs. 91.0 ± 8.2 cm, P < .01), glucose 90' (10.0 ± 2.5 vs. 8.6 ± 2.7 mmol/L, P < .05), glucose 120' (8.8 ± 2.4 vs. 7.6 ± 2.7 mmol/L, P < .05), triglycerides (2.5 ± 1.2 vs. 2.0 ± 1.1 mmol/L, P < .05), very low-density lipoproteins (VLDL) (0.5 ± 0.2 vs. 0.4 ± 0.2 mmol/L, P < .05), and AUC of glucose (694 ± 142 vs. 629 ± 172 mmol/L/min, P < .05) were found. Seven patients (58.3%) of the I. gabonensis group showed remission of MetS and two patients (16.7%) of the placebo group (P = .045). I. gabonensis lead to remission of MetS in 58.3% of the patients and significantly decreased WC, glucose 90', glucose 120', triglycerides, VLDL, and AUC of glucose.

Construcciones conceptuales sobre la educación superiores y calidad educativa en estudiantes universitarios chilenos

Oswaldo Méndez Ramírez 한국외국어대학교 중남미연구소 2012 중남미연구 Vol.31 No.3

The present manuscript explores the representations that students of the University of Chile have with regard to the incentive concepts: “higher education” and “quality of education”. It is a qualitative study that allowed access to conceptual constructs and processes definition of individuals; using the technique of natural semantic networks. The population was made up of students currently enrolled in studies of history; psychology and educational psychology at the University of Chile. The sample was comprised of a total of 70 students. Derived from the analysis, were found three concepts in common: learning, inequality and opportunity. The results led to interpret that the students of the University of Chile, a high quality education must be a right and be an education that promotes learning, combat inequality and provides opportunities.

Therapeutic Effect of Fucoidan on Metabolic Diseases: Experimental Data and Clinical Evidence

Miriam Mendez-del Villar,Karina G. Perez-Rubio,Karina G. Perez-Rubio,Marisol Cortez-Navarrete 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.11

The rising prevalence of metabolic diseases represents a major challenge to public health worldwide. Therefore, there is a strong need to conduct research on the effectiveness of complementary and alternative therapies for metabolic disorders. Fucoidan is a fucose-enriched and sulfated polysaccharide extracted from ubiquitous brown seaweed. The antihypertensive, antidiabetic, antiobesity, and hypolipidemic effects of fucoidan have been reported in preclinical research and clinical trials. This study aims to review the mechanisms of action and the experimental and clinical use of different types of fucoidan for the treatment of metabolic diseases.

Effect of Artemisia dracunculus Administration on Glycemic Control, Insulin Sensitivity, and Insulin Secretion in Patients with Impaired Glucose Tolerance

Miriam Mendez-del Villar,Ana M. Puebla-Perez,Maria J. Sanchez-Pena,Luis J. Gonzalez-Ortiz,Esperanza Martinez-Abundis,Manuel Gonzalez-Ortiz 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.5

To evaluate the effect of Artemisia dracunculus on glycemic control, insulin sensitivity, and insulin secretion in patients with impaired glucose tolerance (IGT). A randomized, double blind, placebo-controlled clinical trial was performed in 24 patients with diagnosis of IGT. Before and after the intervention, glucose and insulin levels were measured every 30 min for 2 h after a 75-g dextrose load, along with glycated hemoglobin A1c (A1C) and lipid profile. Twelve patients received A. dracunculus (1000 mg) before breakfast and dinner for 90 days; the remaining 12 patients received placebo. Area under the curve (AUC) of glucose and insulin, total insulin secretion, first phase of insulin secretion, and insulin sensitivity were calculated. Wilcoxon signed-rank, Mann–Whitney U, and chi-square tests were used for statistical analyses. The institutional ethics committee approved the protocol. After A. dracunculus administration, there were significant decreases in systolic blood pressure (SBP; 120.0 ± 11.3 vs. 113.0 ± 11.2 mmHg, P < .05), A1C (5.8 ± 0.3 vs. 5.6% ± 0.4%, P < .05), AUC of insulin (56,136.0 ± 27,426.0 vs. 44,472.0 ± 23,370.0 pmol/L, P < .05), and total insulin secretion (0.45 ± 0.23 vs. 0.35 ± 0.18, P < .05), with a significant increase in high-density lipoprotein cholesterol (HDL-C) (1.3 ± 0.3 vs. 1.4 ± 0.3 mmol/L, P < .05). There were no significant differences after placebo administration. A. dracunculus administration for 90 days in patients with IGT significantly decreased SBP, A1C, AUC of insulin, and total insulin secretion with a significant increase in HDL-C levels.

Mergers, Privatization and Environmental Considerations

José Méndez Naya 한국국제경제학회 2018 International Economic Journal Vol.32 No.1

The purpose of this paper is to analyze both merger sustainability and optimal privatization decisions, in an international mixed oligopoly model when it is explicitly assumed that firms’ production pollutes the environment. Contrary to traditional theory it is shown that both a merger between private firms and between one private and one public firm could be sustainable. Furthermore, the effects of environmental considerations on mixed firms’ optimal degree of privatization are analyzed.