Rafael Ramírez

Dynamic Properties via Fixed Centroid Path Integrals (2009)

Rafael Ramírez, Telesforo López-ciudad, J. Grotendorst, D. Marx, A. Muramatsu (eds, Rafael Ramírez, ...

Permission to make digital or hard copies of portions of this work for personal or classroom use is granted provided that the copies are not made or distributed for profit or commercial advantage and...

Sobre los sistemas mecánicos con enlaces (2007)

Rafael Ramírez

A mathematical model is proposed in order to describe the behaviour of mechanical systems with constraints.

Construcción de campos vectoriales en base a integrales parciales dadas (2007)

Rafael Ramírez, Natalia Sadovskaia

A mathematical model based in the principle of the less contractions is proposed for the construction of velocity vector fields and forces from given integrals. Necessary algebraic conditions for the...

Bacterial DNA prolongs the survival of inflamed mononuclear cells in haemodialysis patients (2007)

Navarro, Maria Dolores, Carracedo, Julia, Ramírez, Rafael, Madueño, Juan Antonio, Merino, Ana, Rodríguez, Mariano, ...

Background. Chronic kidney disease (CKD) patients show evidence of chronic inflammation with mononuclear cell activation which is mainly caused by uraemia itself and is exacerbated by haemodialysis....

Effect of sputtering rate and ion irradiation on the microstructure and magnetic properties of Ni/Si3N4 multilayers (2005)

Vila, M., Prieto, C., Traverse, A., Ramírez, Rafael

12 pages, 9 figures, 3 tables, 1 appendix.-- PACS: 61.80.Jh; 68.35.Ct; 81.15.Cd; 61.82.-d; 78.70.Dm; 68.65.Ac; 75.70.Cn

Middle to late eocene dinoflagellate cysts and fungal spores from the east coast of the maracaibo lake, venezuela : biostratigraphy, palaeoecology and taxonomy (2004)

Ramírez, Rafael

Die palynologische Untersuchung der Dinoflagellatenzysten und der Überrreste von Pilzen in 155 Proben aus zwei Bohrungen und drei Aufschlüsssen in den mittel- und obereozänen...

The imbalance in the ratio of Th1 and Th2 helper lymphocytes in uraemia is mediated by an increased apoptosis of Th1 subset (2004)

Alvarez-Lara, Maria Antonia, Carracedo, Julia, Ramírez, Rafael, Martín-Malo, Alejandro, Rodríguez, Mariano, Madueño, Juan Antonio, ...

Background. In uraemia there is a reduction in the total number of T lymphocytes and an imbalance in the ratio of Th1/Th2 T-helper (Th) lymphocytes. A higher rate of apoptosis in T lymphocytes...

The effect of LPS, uraemia, and haemodialysis membrane exposure on CD14 expression in mononuclear cells and its relation to apoptosis (2002)

Carracedo, Julia, Ramírez, Rafael, Martin-Malo, Alejandro, Rodríguez, Mariano, Aljama, Pedro

Background. Both uraemia and bioincompatible haemodialysis membranes induce mononuclear cell apoptosis. Recent reports demonstrate that spontaneous apoptosis in normal monocytes is associated with...

Caspase-3-dependent pathway mediates apoptosis of human mononuclear cells induced by cellulosic haemodialysis membranes (2002)

Carracedo, Julia, Ramírez, Rafael, Soriano, Sagrario, Martín-Malo, Alejandro, Rodríguez, Mariano, Aljama, Pedro

Background. Mononuclear cells from patients dialysed with cellulosic membranes undergo rapid apoptosis in vitro. The aim of the present study was to determine whether the apoptosis associated with...

Middle to late eocene dinoflagellate cysts and fungal spores from the east coast of the maracaibo lake, venezuela : biostratigraphy, palaeoecology and taxonomy (2002)

Ramírez, Rafael

Die palynologische Untersuchung der Dinoflagellatenzysten und der Überrreste von Pilzen in 155 Proben aus zwei Bohrungen und drei Aufschlüsssen in den mittel- und obereozänen...

The Schr\"odinger formulation of the Feynman path centroid density (1999)

Ramírez, Rafael, López-Ciudad, Telesforo

We present an analysis of the Feynman path centroid density that provides new insight into the correspondence between the path integral and the Schr\"odinger formulations of statistical mechanics....

The Feynman effective classical potential in the Schr\"odinger formulation (1999)

Ramírez, Rafael, López-Ciudad, Telesforo

New physical insight into the correspondence between path integral concepts and the Schr\"odinger formulation is gained by the analysis of the effective classical potential, that is defined within...

Synthesis and Crystal Structure of Ba6Cu12Fe13S27 (1997)

Llanos, Jaime, Mujica, Carlos, Wittke, Oscar, Gómez-Romero, P., Ramírez, Rafael

The new phase Ba6Cu12Fe13S27, a new djerfisherite-like compound, has been prepared by solid state reaction of BaS3and CuFeS2at 1273 K. This compound crystallizes in the cubic system with space...

Differential equations on the plane with given solutions (1996)

Rafael Ramírez, Natalia Sadovskaia

The aim of this paper is to construct the analytic vector fields on the plane with given as trajectories or solutions. In particular we construct the polynomial vector field from given conics...

La intelectualidad impotente : crítica de la obra de Ludovico Silva / Rafael Ramírez (1981)

Ramírez, Rafael

Trabajo presentado para optar a la categoría de Profesor Asistente. Escuela de Sociología y Antropología. Faces, Universidad Central de Venezuela en 1979