Los puntos a desarrollar son los siguientes:
1.- Los Sistemas Operativos, su evolución y los diferentes tipos
2.-Mencione 10 aplicaciones que funcionen bajo ambiente Windows
3.-Cómo funciona el escritorio de Windows, su barra de tarea y sus íconos.
4.-Funcionamiento del Explorador de Windows.
5.-Que es un virus y mencione 5 antivirus
An Evaluation of Automobile Use, Parking Provision, and Urban Activityctmccahill
Early American cities were built around dense street networks and relied upon a wide variety of modes for transportation. For more than 50 years, however, many small cities have been physically restructured in efforts to provide automobile access comparable to that in the surrounding suburbs. In those cities, the level of automobile use, the physical form, and the level of activity are now very different from cities that, instead, made greater efforts to preserve their existing urban form. This study looks at 11 small cities that have exhibited very different trends in terms of automobile use and infrastructure provision since 1960 in order to gauge how these differences have impacted long-term urban vitality in those cities.
This study relies on socioeconomic and demographic data dating back to 1960, historical travel mode share data, maps depicting the amount of land used for transportation purposes, and policy review. This approach provides unique insight regarding the aggregate impacts of automobile use on urban land consumption and urban vitality as well as a historical perspective revealing how these cities evolved and key policies that enabled these changes.
In our study, we found that higher levels of automobile use correspond with lower concentrations of activities (residential and employment). This is due in large part to the amount of land needed for automobile infrastructure. The cities were divided into two groups: “low automobile use” and “automobile dependent.” On average, parking consumes more than twice as much urban land per activity in automobile dependent cities. These cities also have fewer than half as many productive activities per square mile. The study also reveals that incomes and automobile ownerships rates are higher in cities with low automobile use, suggesting that individuals will choose not to use their automobiles if there are diverse transportation choices and if non-automobile modes of transportation are attractive options. This lessens the amount of automobile infrastructure needed.
Evidence suggests that policy decisions within each city have greatly influenced the changes they experienced over time. Based on the trends revealed in this study, a productive, long-term policy approach should incorporate measures that support diverse transportation systems and efficient use of urban space.
An Evaluation of Automobile Use, Parking Provision, and Urban Activityctmccahill
Early American cities were built around dense street networks and relied upon a wide variety of modes for transportation. For more than 50 years, however, many small cities have been physically restructured in efforts to provide automobile access comparable to that in the surrounding suburbs. In those cities, the level of automobile use, the physical form, and the level of activity are now very different from cities that, instead, made greater efforts to preserve their existing urban form. This study looks at 11 small cities that have exhibited very different trends in terms of automobile use and infrastructure provision since 1960 in order to gauge how these differences have impacted long-term urban vitality in those cities.
This study relies on socioeconomic and demographic data dating back to 1960, historical travel mode share data, maps depicting the amount of land used for transportation purposes, and policy review. This approach provides unique insight regarding the aggregate impacts of automobile use on urban land consumption and urban vitality as well as a historical perspective revealing how these cities evolved and key policies that enabled these changes.
In our study, we found that higher levels of automobile use correspond with lower concentrations of activities (residential and employment). This is due in large part to the amount of land needed for automobile infrastructure. The cities were divided into two groups: “low automobile use” and “automobile dependent.” On average, parking consumes more than twice as much urban land per activity in automobile dependent cities. These cities also have fewer than half as many productive activities per square mile. The study also reveals that incomes and automobile ownerships rates are higher in cities with low automobile use, suggesting that individuals will choose not to use their automobiles if there are diverse transportation choices and if non-automobile modes of transportation are attractive options. This lessens the amount of automobile infrastructure needed.
Evidence suggests that policy decisions within each city have greatly influenced the changes they experienced over time. Based on the trends revealed in this study, a productive, long-term policy approach should incorporate measures that support diverse transportation systems and efficient use of urban space.
Sol gel synthesis and characterization of lithium yttrium oxideeSAT Journals
Abstract Lithium yttrium oxide LiYO2 was synthesized for the first time by a simple citric acid-assisted sol-gel method. Three different molar ratios from low to high concentration of lithium precursor were used. The higher lithium precursor content provided purer LiYO2 powders, which were obtained by calcining the amorphous powders from the sol-gel process at lower temperature, compared to those synthesized by solid-state reaction. The optimum experimental conditions for sol-gel preparation process is 1:3 and 1:2 molar ratio of [Li(CH3COO]∙2H2O]/[Y(NO3)3∙6H2O] at 950°C and 1000°C respectively, with 6 hours of holding time. The reaction and synthesis mechanism for LiYO2 was analyzes and proposed. It was found that the calcination of dried gel generated exothermic reactions and synthesize of LiYO2 was performed by simple reaction of Li2O and Y2O3. Keywords: Lithium yttrium oxide (LiYO2), Sol–gel synthesis, mechanism.
Presentacion del sistema operativo windows y sus aplicacionesGregory Gonzalez
Presentacion basica sobre el sistema operativo windows y sus aplicaciones que determina la importancia de esta herramienta en la evolución de nuevas tecnologias.
2. “Es un grupo de programas de
proceso con las rutinas de
control necesarias para
mantener continuamente
operativos dichos programas"
Es el instrumento indispensable para
hacer de la computadora un objeto útil.
5. Cómo funciona el escritorio de
Windows, su barra de tarea y sus
íconos.
6. Iconos
Los símbolos pequeños se llaman iconos. El uso de estos iconos es para
diferenciar los tipos de archivos y programas almacenados en su
ordenador. Coloque el cursor encima de un icono. Aparecerá el nombre
o el texto del contenido del icono: Haciendo doble clic sobre el icono
iniciará un programa.
7. Barra de tareas
Se denomina barra de tareas a la barra que sirve para encontrar lo buscado y controlar
aplicaciones de diversos sistemas operativos, entre ellos Microsoft Windows, Linux y Mac
os X.
8. Funciones básicas del Explorador de
Windows
Explorer o Explorador de Windows es el administrador de archivos oficial del
Sistema Operativo Microsoft Windows. Fue incluido desde Windows 95 hasta las
más recientes versiones de Windows.
Es un componente principal del Sistema Operativo, permite administrar el equipo,
crear archivos, crear carpetas, etc.
El explorador de Windows sirve para ver las carpetas y archivos dentro de tu disco
duro, tanto de datos, como archivos de programas y del sistema. También te ofrece
información de cada archivo o carpeta, como tamaño, fecha de última
modificación, tipo de archivo, etc.
9. Que es un virus
Los virus son programas informáticos que tienen como objetivo alterar el
funcionamiento del computador, sin que el usuario se de cuenta. Estos, por lo
general, infectan otros archivos del sistema con la intensión de modificarlos para
destruir de manera intencionada archivos o datos almacenados en tu computador
