Leonardo Diaz - Academia.edu (original) (raw)

Papers by Leonardo Diaz

Cuaderno De Pedagogia Universitaria, Jul 14, 2014

Ingenieria E Investigacion, Feb 4, 2011

En el presente trabajo se describen los mecanismos básicos de deformación y fractura mediante los... more En el presente trabajo se describen los mecanismos básicos de deformación y fractura mediante los cuales se formaron los cráteres que se presentaron al impactar con varios tipos de proyectiles, una serie de blancos de acero (chapas), los cuales recibieron diferentes ciclos de tratamiento térmico. Cada uno de los cráteres se caracterizó mediante ensayos de inspección visual y metalografia, evaluándose a partir de los resultados la morfología típica que presenta el maclaje, el deslizamiento, las bandas de corte adiabáticas, el desconchamiento y el agrietamiento, producidos por el impacto de los proyectiles.

Agricultura Tecnica En Mexico, Aug 1, 2006

Analisis Politico, May 1, 2005

"RESUMEN: El reality show es el formato televisivo más exitoso de los últimos añ... more "RESUMEN: El reality show es el formato televisivo más exitoso de los últimos años. Este artículo efectúa una exploración en torno a dicho formato articulada en tres partes. Primero, se estudiará la tensión que los realities generan entre la representación como esquema estético tradicional y la simulación como esquema estético emergente; luego, se detallará la manera en que los realities participan en la producción del mundo como imagen; finalmente, se explicará el papel que los realities juegan en el marco de la economía estética contemporánea y se ofrecerá una explicación sociopsicológica de su poder de seducción. El artículo en su conjunto aborda el estudio del reality a través del lente amplio de una crítica de la industria del entretenimiento. PALABRAS CLAVE: reality show, televisión, entretenimiento, simulación. ________________________________________________ The Simulated Reality. A Critique on Reality Shows. Reality shows are one of the most successful television genres in the last few years. The exploration that this article will make around this genre consists of three parts. First, the tension that realities cause between representation as a traditional aesthetic style and simulation as an emergent aesthetic style will be examined. Second, the way realities participate in the construction of the world as image will be described. Finally, the article will explain the role that realities play in the contemporary aesthetic economy, and offer a socio-psychological explanation of its seductive power. The article approaches the study of reality shows by taking a critical perspective to the entertainment industry. Key words: reality show, television, entertainment, simulation."

Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en ... more Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en la región Ciénega de Chapala, México

Historia Critica, Dec 1, 2008

ABSTRACT

Agricultura Tecnica En Mexico, 2008

A series of NiMo/g-Al 2 O 3 -TiO 2 catalysts were prepared and tested in the hydrotreating of hea... more A series of NiMo/g-Al 2 O 3 -TiO 2 catalysts were prepared and tested in the hydrotreating of heavy gasoil FCC feed in a pilot plant fixed-bed reactor. Three different methods were applied to obtain the alumina-titania mixed oxides: impregnation of titanium butoxide over a g-Al 2 O 3 support, co-precipitation of a mixture of aluminum sulfate, sodium aluminate and titanium sulfate, and a sol-gel method using alkoxides as precursors; the titanium content was kept constant (5 wt.%). Additionally, a g-Al 2 O 3 support was also prepared as a reference. All supports were characterized by XRD, FT-IR pyridine and HRTEM. Catalysts were prepared by spraying at incipient wetness with the appropriate Ni-Mo solution. Catalytic activity results (HDS, HDM and HDA) showed marked influence of the preparation method. This behaviour is explained in terms of the differences in titania dispersion and acidity of the support. #

Catalysis Today, 2005

An experimental study was conducted in a pilot plant fixed-bed reactor in order to evaluate the e... more An experimental study was conducted in a pilot plant fixed-bed reactor in order to evaluate the effect of hydrogen sulfide on hydrotreating activity of an industrial heavy gasoil Fluid Catalytic Cracking (FCC) feed recovered from a Mexican refinery. Hydrotreating reactions were carried out at three temperatures (603, 638 and 673 K), 11.76 MPa of pressure and LHSVof 6 h À1 . Studies were done varying hydrogen sulfide concentration 0, 100, 450 and 750 vol ppm (0, 3100, 12,960 and 23,210 Pa, respectively) at the same operating conditions over a commercial NiMo/g-Al 2 O 3 -TiO 2 catalyst. Experimental results showed different behavior for these reactions. An inhibiting effect on hydrodesulfurization (HDS), hydrodearomatization (HDA) and hydrodenitrogenation (HDN) was observed, whereas the hydrodemetallization (HDM) reaction showed an increase in the activity. Apparent activation energies were also determined for each reaction. #

Anthropos Boletin De Informacion Y Documentacion, 1995

Revista Latinoamericana De Filosofia, May 1, 2011

... Leonardo Ordóñez Díaz Escuela de Ciencias Humanas Universidad del Rosario. ... Según Deleuze,... more ... Leonardo Ordóñez Díaz Escuela de Ciencias Humanas Universidad del Rosario. ... Según Deleuze, los acontecimientos se distinguen en primer término porque su aparición se produce siempre por contraste con un ruido de fondo; en cada caso existe un telón caótico sobre el ...

Agricultura Tecnica En Mexico, Aug 1, 2006

Mexican corn rootworm Diabrotica virgifera zeae is an important root pests of maize in Cienega de... more Mexican corn rootworm Diabrotica virgifera zeae is an important root pests of maize in Cienega de Chapala, Jalisco, Mexico. A study was conducted during 1995 with and without chemical control to determine the level of susceptibility of 16 commercial maize hybrids to the attack D. virgifera zeae. Susceptibility reaction was analized by principal components and discriminant analysis. Measured traits included root damage, lodging percentage, leaves per plant, plant height, final number of plants and yield. In addition, samples of larvae were taken in the experimental plots and differences between plots with and without control were determined. Tolerant maize hybrids were H-357, Cargill 820, Pioneer 3066 and Pioneer 3002, while the most susceptible hybrids were: H-355, H-358, Cargill 220, Cargill 381 and Asgrow 791. There was variation in the susceptibility of the tested hybrids to Mexican corn rootworm. Tolerant hybrids can be used in the regions of Jalisco with severe losses associated with the studied root pests.

Revista Cientifica Udo Agricola, 2009

Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en ... more Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en la región Ciénega de Chapala, México

Http Dx Doi Org 10 1081 Lft 120028529, Aug 14, 2007

ABSTRACT Presently, oil refining in Mexico has been focused into increased Maya heavy crude oil p... more ABSTRACT Presently, oil refining in Mexico has been focused into increased Maya heavy crude oil processing. This type of crude oil contains high levels of heavy hydrocarbons and poly-aromatic structure compounds containing metals (Ni + V), sulfur and nitrogen. On the other hand, the worldwide fuel specifications are now being considered that may require reducing the sulfur content for both gasoline and high-speed diesel fuels to less than 50-wt ppm by year 2005. Therefore, one alternative route is the Heavy FCC feeds pretreatment in order to improve the Fluid Catalytic Cracking catalyst performance increasing its life cycle and the quality of gasoline and diesel (without sulfur and low aromatic content). In this article the hydrotreating activity of heavy gas oil was studied over NiMo/Al2O3 and NiMo/Al2O3–SiO2 at pilot plant level. These materials were characterized by scanning Electronic Microscopy; FTIR Pyridine thermodesorption, nitrogen physisorption and the elemental analysis. The nominal content of Mo was around 3.5 Mo atoms per square nanometer in both catalysts. It was found that the rate of Hydrodesulfurization (HDS) at 613K over NiMo/Al2O3–SiO2 was higher than the observed for the NiMo/Al2O3 support (7.3E-2 > 5.4E-2 molS h g), respectively. Furthermore, the rate of hydrodearomatization (HDA) for NiMo/Al2O3–SiO2 showed better results than NiMo/Al2O3 at the same temperature range. Characterization data were correlated with the catalytic activity results. The activity of these catalysts showed significant differences when the alumina was modified by silica, where the apparent rate of conversion of sulfur and aromatic compounds were major for NiMo/Al2O3–SiO2 catalyst, as previously reported for other reactions.

Revista De La Sociedad Entomologica Argentina, 2008

ABSTRACT. Ceratitis capitata (Wiedemann) is a cosmopolitan Tephritids dipteran native to the nort... more ABSTRACT. Ceratitis capitata (Wiedemann) is a cosmopolitan Tephritids dipteran native to the north of Africa, which is the main plague of fruit trees in many countries of the American continent. Here we assess the dispersion capacity of the Ceratitis capitata, by releasing sterile flies under field conditions, in order to predict possible invasion to agricultural valleys nearby. 54,000 marked sterile flies of both sexes were released in locations of the Tulum Valley, close to the access to the Ullum and Zonda valleys. Jackson & Mc Phail traps were set up for monitoring the dispersion flights. 1,213 adults were captured during the sampling period, and there was no dispersion of the released adults from the Tulum valley to the Ullum and Zonda valleys. Host presence, geographical position of each ravine and wind orientation could explain the dispersion difference betwen both ravines. The dispersion lasted five weeks and the average dispersion distance reached by the released adults was of 3,764 m (S= 2897 m). No differences between sexes were detected.

Journal of Physics Conference Series

The esthetic dentistry reference in our society is determined by several factors, including one t... more The esthetic dentistry reference in our society is determined by several factors, including one that produces more dissatisfaction is abnormal tooth color or that does not meet the patient's expectations. For this reason it has been designed and implemented an algorithm in MATLAB that captures, digitizes, pre-processing and analyzed dental imaging by allowing to evaluate the degree of bleaching caused by the use of peroxide of hidrogen. The samples analyzed were human teeth extracted, which were subjected to different concentrations of peroxide of hidrogen and see if they can teeth whitening when using these products, was used different concentrations and intervals of time to analysis or study of the whitening of the teeth with the hydrogen peroxide.

Journal of Physics Conference Series

In the present investigation, a mathematical algorithm under Matlab platform using Radial Hilbert... more In the present investigation, a mathematical algorithm under Matlab platform using Radial Hilbert Transform and Random Phase Mask for encrypting digital images is implemented. The algorithm is based on the use of the conventional Fourier transform and two random phase masks, which provide security and robustness to the system implemented. Random phase masks used during encryption and decryption are the keys to improve security and make the system immune to attacks by program generation phase masks.

Cuaderno De Pedagogia Universitaria, Jul 14, 2014

Ingenieria E Investigacion, Feb 4, 2011

En el presente trabajo se describen los mecanismos básicos de deformación y fractura mediante los... more En el presente trabajo se describen los mecanismos básicos de deformación y fractura mediante los cuales se formaron los cráteres que se presentaron al impactar con varios tipos de proyectiles, una serie de blancos de acero (chapas), los cuales recibieron diferentes ciclos de tratamiento térmico. Cada uno de los cráteres se caracterizó mediante ensayos de inspección visual y metalografia, evaluándose a partir de los resultados la morfología típica que presenta el maclaje, el deslizamiento, las bandas de corte adiabáticas, el desconchamiento y el agrietamiento, producidos por el impacto de los proyectiles.

Agricultura Tecnica En Mexico, Aug 1, 2006

Analisis Politico, May 1, 2005

"RESUMEN: El reality show es el formato televisivo más exitoso de los últimos añ... more "RESUMEN: El reality show es el formato televisivo más exitoso de los últimos años. Este artículo efectúa una exploración en torno a dicho formato articulada en tres partes. Primero, se estudiará la tensión que los realities generan entre la representación como esquema estético tradicional y la simulación como esquema estético emergente; luego, se detallará la manera en que los realities participan en la producción del mundo como imagen; finalmente, se explicará el papel que los realities juegan en el marco de la economía estética contemporánea y se ofrecerá una explicación sociopsicológica de su poder de seducción. El artículo en su conjunto aborda el estudio del reality a través del lente amplio de una crítica de la industria del entretenimiento. PALABRAS CLAVE: reality show, televisión, entretenimiento, simulación. ________________________________________________ The Simulated Reality. A Critique on Reality Shows. Reality shows are one of the most successful television genres in the last few years. The exploration that this article will make around this genre consists of three parts. First, the tension that realities cause between representation as a traditional aesthetic style and simulation as an emergent aesthetic style will be examined. Second, the way realities participate in the construction of the world as image will be described. Finally, the article will explain the role that realities play in the contemporary aesthetic economy, and offer a socio-psychological explanation of its seductive power. The article approaches the study of reality shows by taking a critical perspective to the entertainment industry. Key words: reality show, television, entertainment, simulation."

Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en ... more Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en la región Ciénega de Chapala, México

Historia Critica, Dec 1, 2008

ABSTRACT

Agricultura Tecnica En Mexico, 2008

A series of NiMo/g-Al 2 O 3 -TiO 2 catalysts were prepared and tested in the hydrotreating of hea... more A series of NiMo/g-Al 2 O 3 -TiO 2 catalysts were prepared and tested in the hydrotreating of heavy gasoil FCC feed in a pilot plant fixed-bed reactor. Three different methods were applied to obtain the alumina-titania mixed oxides: impregnation of titanium butoxide over a g-Al 2 O 3 support, co-precipitation of a mixture of aluminum sulfate, sodium aluminate and titanium sulfate, and a sol-gel method using alkoxides as precursors; the titanium content was kept constant (5 wt.%). Additionally, a g-Al 2 O 3 support was also prepared as a reference. All supports were characterized by XRD, FT-IR pyridine and HRTEM. Catalysts were prepared by spraying at incipient wetness with the appropriate Ni-Mo solution. Catalytic activity results (HDS, HDM and HDA) showed marked influence of the preparation method. This behaviour is explained in terms of the differences in titania dispersion and acidity of the support. #

Catalysis Today, 2005

An experimental study was conducted in a pilot plant fixed-bed reactor in order to evaluate the e... more An experimental study was conducted in a pilot plant fixed-bed reactor in order to evaluate the effect of hydrogen sulfide on hydrotreating activity of an industrial heavy gasoil Fluid Catalytic Cracking (FCC) feed recovered from a Mexican refinery. Hydrotreating reactions were carried out at three temperatures (603, 638 and 673 K), 11.76 MPa of pressure and LHSVof 6 h À1 . Studies were done varying hydrogen sulfide concentration 0, 100, 450 and 750 vol ppm (0, 3100, 12,960 and 23,210 Pa, respectively) at the same operating conditions over a commercial NiMo/g-Al 2 O 3 -TiO 2 catalyst. Experimental results showed different behavior for these reactions. An inhibiting effect on hydrodesulfurization (HDS), hydrodearomatization (HDA) and hydrodenitrogenation (HDN) was observed, whereas the hydrodemetallization (HDM) reaction showed an increase in the activity. Apparent activation energies were also determined for each reaction. #

Anthropos Boletin De Informacion Y Documentacion, 1995

Revista Latinoamericana De Filosofia, May 1, 2011

... Leonardo Ordóñez Díaz Escuela de Ciencias Humanas Universidad del Rosario. ... Según Deleuze,... more ... Leonardo Ordóñez Díaz Escuela de Ciencias Humanas Universidad del Rosario. ... Según Deleuze, los acontecimientos se distinguen en primer término porque su aparición se produce siempre por contraste con un ruido de fondo; en cada caso existe un telón caótico sobre el ...

Agricultura Tecnica En Mexico, Aug 1, 2006

Mexican corn rootworm Diabrotica virgifera zeae is an important root pests of maize in Cienega de... more Mexican corn rootworm Diabrotica virgifera zeae is an important root pests of maize in Cienega de Chapala, Jalisco, Mexico. A study was conducted during 1995 with and without chemical control to determine the level of susceptibility of 16 commercial maize hybrids to the attack D. virgifera zeae. Susceptibility reaction was analized by principal components and discriminant analysis. Measured traits included root damage, lodging percentage, leaves per plant, plant height, final number of plants and yield. In addition, samples of larvae were taken in the experimental plots and differences between plots with and without control were determined. Tolerant maize hybrids were H-357, Cargill 820, Pioneer 3066 and Pioneer 3002, while the most susceptible hybrids were: H-355, H-358, Cargill 220, Cargill 381 and Asgrow 791. There was variation in the susceptibility of the tested hybrids to Mexican corn rootworm. Tolerant hybrids can be used in the regions of Jalisco with severe losses associated with the studied root pests.

Revista Cientifica Udo Agricola, 2009

Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en ... more Evaluación de herbicidas para el control de malezas en garbanzo (Cicer arietinum L.) de riego en la región Ciénega de Chapala, México

Http Dx Doi Org 10 1081 Lft 120028529, Aug 14, 2007

ABSTRACT Presently, oil refining in Mexico has been focused into increased Maya heavy crude oil p... more ABSTRACT Presently, oil refining in Mexico has been focused into increased Maya heavy crude oil processing. This type of crude oil contains high levels of heavy hydrocarbons and poly-aromatic structure compounds containing metals (Ni + V), sulfur and nitrogen. On the other hand, the worldwide fuel specifications are now being considered that may require reducing the sulfur content for both gasoline and high-speed diesel fuels to less than 50-wt ppm by year 2005. Therefore, one alternative route is the Heavy FCC feeds pretreatment in order to improve the Fluid Catalytic Cracking catalyst performance increasing its life cycle and the quality of gasoline and diesel (without sulfur and low aromatic content). In this article the hydrotreating activity of heavy gas oil was studied over NiMo/Al2O3 and NiMo/Al2O3–SiO2 at pilot plant level. These materials were characterized by scanning Electronic Microscopy; FTIR Pyridine thermodesorption, nitrogen physisorption and the elemental analysis. The nominal content of Mo was around 3.5 Mo atoms per square nanometer in both catalysts. It was found that the rate of Hydrodesulfurization (HDS) at 613K over NiMo/Al2O3–SiO2 was higher than the observed for the NiMo/Al2O3 support (7.3E-2 > 5.4E-2 molS h g), respectively. Furthermore, the rate of hydrodearomatization (HDA) for NiMo/Al2O3–SiO2 showed better results than NiMo/Al2O3 at the same temperature range. Characterization data were correlated with the catalytic activity results. The activity of these catalysts showed significant differences when the alumina was modified by silica, where the apparent rate of conversion of sulfur and aromatic compounds were major for NiMo/Al2O3–SiO2 catalyst, as previously reported for other reactions.

Revista De La Sociedad Entomologica Argentina, 2008

ABSTRACT. Ceratitis capitata (Wiedemann) is a cosmopolitan Tephritids dipteran native to the nort... more ABSTRACT. Ceratitis capitata (Wiedemann) is a cosmopolitan Tephritids dipteran native to the north of Africa, which is the main plague of fruit trees in many countries of the American continent. Here we assess the dispersion capacity of the Ceratitis capitata, by releasing sterile flies under field conditions, in order to predict possible invasion to agricultural valleys nearby. 54,000 marked sterile flies of both sexes were released in locations of the Tulum Valley, close to the access to the Ullum and Zonda valleys. Jackson & Mc Phail traps were set up for monitoring the dispersion flights. 1,213 adults were captured during the sampling period, and there was no dispersion of the released adults from the Tulum valley to the Ullum and Zonda valleys. Host presence, geographical position of each ravine and wind orientation could explain the dispersion difference betwen both ravines. The dispersion lasted five weeks and the average dispersion distance reached by the released adults was of 3,764 m (S= 2897 m). No differences between sexes were detected.

Journal of Physics Conference Series

The esthetic dentistry reference in our society is determined by several factors, including one t... more The esthetic dentistry reference in our society is determined by several factors, including one that produces more dissatisfaction is abnormal tooth color or that does not meet the patient's expectations. For this reason it has been designed and implemented an algorithm in MATLAB that captures, digitizes, pre-processing and analyzed dental imaging by allowing to evaluate the degree of bleaching caused by the use of peroxide of hidrogen. The samples analyzed were human teeth extracted, which were subjected to different concentrations of peroxide of hidrogen and see if they can teeth whitening when using these products, was used different concentrations and intervals of time to analysis or study of the whitening of the teeth with the hydrogen peroxide.

Journal of Physics Conference Series

In the present investigation, a mathematical algorithm under Matlab platform using Radial Hilbert... more In the present investigation, a mathematical algorithm under Matlab platform using Radial Hilbert Transform and Random Phase Mask for encrypting digital images is implemented. The algorithm is based on the use of the conventional Fourier transform and two random phase masks, which provide security and robustness to the system implemented. Random phase masks used during encryption and decryption are the keys to improve security and make the system immune to attacks by program generation phase masks.