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TWO CONDITIONS ON THE RICCI TENSOR OF A REAL HYPERSURFACE OF COMPLEX PROJECTIVE SPACE
ORTEGA, MIGUEL,PE´REZ, JUAN DE DIOS,SUH, YOUNG JIN 경북대학교 위상수학 기하학연구센터 1999 硏究論文集 Vol.8 No.-
We study two conditions on the Ricci tensor of a real hypersurface of complex projective space that allows us to characterize certain real hypersurfaces. We also introduce a new kind of such real hypersurfaces.
Israel Parra-Ortega,Diana Guadalupe Alcara-Ramirez,Alma Angelica Ronzon-Ronzon,Fermin Elias-Garcia,Jose Agustin Mata-Chapol,Alejandro Daniel Cervantes-Cot,Briceida Lopez-Martinez,Miguel Angel Villasis 한국영양학회 2021 Nutrition Research and Practice Vol.15 No.S
BACKGROUND/OBJECTIVES: Considering the high number of deaths from coronavirus disease 2019 (COVID-19) in Latin American countries, together with multiple factors that increase the prevalence of vitamin D deficiency, we aimed to determine 25-hydroxyvitamin D (25[OH]D) levels and its association with mortality in patients with critical COVID-19. SUBJECTS/METHODS: This was a prospective observational study including adult patients with critical COVID-19. Data, including clinical characteristics and 25(OH)D levels measured at the time of intensive care unit admission, were collected. All patients were followed until hospital discharge or in-hospital death. The patients were divided into those surviving and deceased patient groups, and univariate and multivariate logistic regression analyses were performed to determine independent predictors of in hospital mortality. RESULTS: The entire cohort comprised 94 patients with critical COVID-19 (males, 59.6%; median age, 61.5 years). The median 25(OH)D level was 12.7 ng/mL, and 15 (16%) and 79 (84%) patients had vitamin D insufficiency and vitamin D deficiency, respectively. The median serum 25(OH)D level was significantly lower in deceased patients compared with surviving (12.1 vs. 18.7 ng/mL, P < 0.001). Vitamin D deficiency was present in 100% of the deceased patients. Multivariate logistic regression analysis revealed that age, body mass index, other risk factors, and 25(OH)D level were independent predictors of mortality. CONCLUSIONS: Vitamin D deficiency was present in 84% of critical COVID-19 patients. Serum 25(OH)D was independently associated with mortality in critical patients with COVID-19.
Pseudo-parallel Real Hypersurfaces in Complex Space Forms
Guillermo A. Lobos,Miguel Ortega 대한수학회 2004 대한수학회보 Vol.41 No.4
Pseudo-parallel real hypersurfaces in complex space forms can bedefined as an extrinsic analogues of pseudo-symmetric realhypersurfaces, that generalize the notion of semi-symmetric realhypersurface. In this paper a classification of thepseudo-parallel real hypersurfaces in a non-flat complex spaceforms is obtained.
PSEUDO-PARALLEL REAL HYPERSURFACES IN COMPLEX SPACE FORMS
Lobos, Guillermo A.,Ortega, Miguel Korean Mathematical Society 2004 대한수학회보 Vol.41 No.4
Pseudo-parallel real hypersurfaces in complex space forms can be defined as an extrinsic analogues of pseudo-symmetric real hypersurfaces, that generalize the notion of semi-symmetric real hypersurface. In this paper a classification of the pseudo-parallel real hypersurfaces in a non-flat complex space forms is obtained.
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.