Lecture on cable design and manufacture

example for web site

Échame otro cable.

Durante una convocatoria anterior y gracias a la ayuda de los proyectos Échame un cable de PNTIC, Jóvenes estudiantes del Ayuntamiento de Palma y el grupo de Trabajo, se instalaron los primeros cables de la intranet del centro, se instaló el primer servidor de páginas web local y se estableció la conexión a Internet para ocho ordenadores del centro. El grupo de trabajo solicitó ampliar el programa ya que el centro se encontraba en el Proyecto Atenea y contaba con un presupuesto aceptable y la implicación de la comunidad escolar

Español y tecnología : enseñar con un 'tablet-PC' e internet sin cable.

Título del congreso : 'El español, lengua del futuro'

Análisis del sector de las PYME de televisión por cable de Imbabura y Carchi, en el ámbito de la transición a servicios convergentes de telecomunicaciones

Los grandes operadores de televisión pagada en el Ecuador, han invertido y actualmente ofrecen el servicio de Internet en las principales ciudades, sin embargo, en las provincias pequeñas, como Imbabura y Carchi, la población no tiene esta opción de servicio, a pesar de que existe una demanda creciente y la red disponible que es propiedad de las PYME de televisión por cable. Las últimas deberán enfrentar en el futuro mediato, la encrucijada de incursionar o no en el negocio de Internet, ser capaces de analizar su proceso de participación, no sólo desde el punto de vista técnico, sino principalmente económico, y para ello deben considerar sus posibilidades de competir en el mercado, y analizar detalladamente los nuevos aspectos técnicos, de mercado, financieros, y organizacionales que son necesarios para tomar la decisión administrativa correcta. El contenido del presente trabajo consiste en un análisis sistemático de los entornos del sector de las PYME de televisión pagada en las provincias de Imbabura y Carchi, dentro de la convergencia. En el entorno macro se examina el ambiente macroeconómico del país y del marco regulatorio vigente; dentro del entorno meso se analiza el mercado potencial y las posibilidades de competencia; en el entorno micro se analiza la factibilidad de inversión financiera; para obtener finalmente un modelo sobre las condiciones que deberían presentarse para hacer posible la transición a servicios convergentes de telecomunicaciones. La presente investigación pretende ser un aporte útil para las PYME de televisión pagada, al proporcionarles una referencia de evaluación, que puede ser utilizada para la toma de decisión; y para el Organismo de Regulación de Telecomunicaciones, al analizar un modelo de negocio que permita acortar la brecha digital de acceso a Internet de los habitantes del Ecuador.

Involvement of phenazine-1-carboxylic acid, siderophores and hydrogen cyanide in suppression of Rhizoetonia solani and Pythium spp. damping-off by Pseudomonas oryzihabitans and Xenorhabdus nematophila

Entomopathogenic bacterial strains Pseudomonas (Flavimonas) oryzihabitans and Xenorhabdus nematophilus, both bacterial symbionts of the entomopathogenic nematodes Steinernema abbasi and S. carpocapsae have been recently used for suppression of soil-borne pathogens. Bacterial biocontrol agents (P. oryzihabitans and X nematophila) have been tested for production of secondary metabolites in vitro and their fungistatic effect,on mycelium and spore development of soil-borne pathogens. Isolates of Pythium spp. and Rhizoctonia solani, the causal agent of cotton damping-off, varied in sensitivity in vitro to the antibiotics phenazine-I-carboxylic acid (PCA), cyanide (HCN) and siderophores produced by bacterial strains shown previously to have potential for biological control of those pathogens. These findings affirm the role of the antibiotics PCA, HCN and siderophores in the biocontrol activity of these entomopathogenic strains and support earlier evidence that mechanisms of secondary metabolites are responsible for suppression of damping-off diseases. In the present studies colonies of R oryzihabitans showed production of PCA with presence of crystalline deposits after six days development and positive production where found as well in the siderophore's assay when X nematophila strain indicated HCN production in the in vitro assays. In vitro antifungal activity showed that bacteria densities of 101 to 10(6)cells/ml have antifungal activity in different media cultures. The results show further that isolates of Pythium spp. and R. solani insensitive to PCA, HCN and siderophores are present in the pathogen population and provide additional justification for the use of mixtures of entomopathogenic strains that employ different mechanisms of pathogen suppression to manage damping-off.

Biological control of Rhizoctonia solani Damping-off with a bacterium symbiotically associated with Steinernema abbasi

Rhizoctonia solani is a causal agent of damping-off of may cultivated plants. An isolate of the bacterium Pseudomonas oryzihabitans, symbiotically associated with the entomopathogenic nematode Steinernema abbasi, strongly inhibited the pathogen in vitro. The bacterium was firmly attached onto fungus mycelia and degraded the cell walls of the pathogen. In greenhouse experiments, bacterial suspension in sterile water applied in the soil, effectively controlled damping-off of radish.

Design of redundant drive joint with adjustable stiffness and damping mechanism to improve joint admittance

Improving admittance of robotic joints is the key issue for making rehabilitation robots safe. This paper describes a design of Redundant Drive Joint (RD-Joint) which allows greater flexibility in the design of robotic mechanisms. The design strategy of the RD-Joint employs a systematic approach which consists of 1) adopting a redundant joint mechanism with internal kinematical redundancy to reduce effective joint inertia, and 2) adopting an adjustable admittance mechanism with a novel Cross link Reduction Mechanism and mechanical springs and dampers as a passive second actuator. First, the basic concepts used to construct the redundant drive joint mechanism are explained, in particular the method that allows a reduction in effective inertia at the output joint. The basic structure of the RD-Joint is introduced based on the idea of reduced inertia along with a method to include effective stiffness and damping. Then, the basic design of the adjustable admittance mechanism is described. Finally, a prototype of RD-joint is described and its expected characteristics are discussed.

Roles of the translationally controlled tumour protein (TCTP) and the double-stranded RNA-dependent protein kinase, PKR, in cellular stress responses

Translationally controlled tumour protein (TCTP) is a highly conserved protein present in all eukaryotic organisms. Various cellular functions and molecular interactions have been ascribed to this protein, many related to its growth-promoting and antiapoptotic properties. TCTP levels are highly regulated in response to various cellular stimuli and stresses. We have shown recently that the double-stranded RNA-dependent protein kinase, PKR, is involved in translational regulation of TCTP. Here we extend these studies by demonstrating that TCTP is downregulated in response to various proapoptotic treatments, in particular agents that induce Ca++ stress, in a PKR-dependent manner. This regulation requires phosphorylation of protein synthesis factor eIF2α. Since TCTP has been characterized as an antiapoptotic and Ca++-binding protein, we asked whether it is involved in protecting cells from Ca++-stress-induced apoptosis. Overexpression of TCTP partially protects cells against thapsigargin-induced apoptosis, as measured using caspase-3 activation assays, a nuclear fragmentation assay, using fluorescence-activated cell sorting analysis, and time-lapse video microscopy. TCTP also protects cells against the proapoptotic effects of tunicamycin and etoposide, but not against those of arsenite. Our results imply that cellular TCTP levels influence sensitivity to apoptosis and that PKR may exert its proapoptotic effects at least in part through downregulation of TCTP via eIF2α phosphorylation.

Using modelling tools to optimise the calculation and subsequent reduction of cable distortion parameters with application to oil well logging systems

This paper discusses how the use of computer-based modelling tools has aided the design of a telemetry unit for use with oil well logging. With the aid of modern computer-based simulation techniques, the new design is capable of operating at data rates of 2.5 times faster than previous designs.