En este power point podemos encontrar gran cantidad de información relacionada con el tema de la reproducción de los seres vivos. Está creada para 6º curso de Educación Primaria.
Review of Productivity improvement by implementing automation In manufacturin...ijsrd.com
Grinding wheels are made of natural or synthetic abrasive minerals bonded together in a matrix to form a wheel. For manufacturers, grinding wheels provide an efficient way to shape and finish metals and other materials. Grinding wheels are the only way to create parts with precision dimensions and high-quality surface finishes. At this time, grinding wheels are used in almost every industry. Manufacturing of a grinding wheel consist of mixing abrasive grains, binders and bonding materials. Three important components, abrasive grains with binders and bonding materials, make up any grinding wheel. The, additives are mixed to create a wheel with the properties necessary to shape a particular material in the manner desired. Abrasive grains include the central part of any grinding wheel, and the toughness and friability of the grinding materials will significantly affect the behavior of a given wheel. In the next step the ingredient mix is poured into the mold and compressed by a hydraulic press. Most grinding wheels are manufactured by the compression method, in which a mixture of components is pressed into shape at room temperature. The wheel is then fired at 200 0C-1260 0C depending upon the type of the bond. The purposes of the firing are to melt the binder around the abrasives and to convert it to a form that will resist the heat and solvents encountered during grinding. Variety of furnaces is used to fire grinding wheels. After firing, wheels are moved to a finishing area, where holes are reamed to the specified size and the wheel circumference is made concentric with the center. Some work may be necessary to correct thickness or parallelism of wheel sides, or to make a special contour on the side or circumference of the wheel. Sometimes balancing of large wheels is necessary to reduce the vibration that will be generated when the wheel is spun on a grinding machine.
En este power point podemos encontrar gran cantidad de información relacionada con el tema de la reproducción de los seres vivos. Está creada para 6º curso de Educación Primaria.
Review of Productivity improvement by implementing automation In manufacturin...ijsrd.com
Grinding wheels are made of natural or synthetic abrasive minerals bonded together in a matrix to form a wheel. For manufacturers, grinding wheels provide an efficient way to shape and finish metals and other materials. Grinding wheels are the only way to create parts with precision dimensions and high-quality surface finishes. At this time, grinding wheels are used in almost every industry. Manufacturing of a grinding wheel consist of mixing abrasive grains, binders and bonding materials. Three important components, abrasive grains with binders and bonding materials, make up any grinding wheel. The, additives are mixed to create a wheel with the properties necessary to shape a particular material in the manner desired. Abrasive grains include the central part of any grinding wheel, and the toughness and friability of the grinding materials will significantly affect the behavior of a given wheel. In the next step the ingredient mix is poured into the mold and compressed by a hydraulic press. Most grinding wheels are manufactured by the compression method, in which a mixture of components is pressed into shape at room temperature. The wheel is then fired at 200 0C-1260 0C depending upon the type of the bond. The purposes of the firing are to melt the binder around the abrasives and to convert it to a form that will resist the heat and solvents encountered during grinding. Variety of furnaces is used to fire grinding wheels. After firing, wheels are moved to a finishing area, where holes are reamed to the specified size and the wheel circumference is made concentric with the center. Some work may be necessary to correct thickness or parallelism of wheel sides, or to make a special contour on the side or circumference of the wheel. Sometimes balancing of large wheels is necessary to reduce the vibration that will be generated when the wheel is spun on a grinding machine.
2. La reproducción asexual
En la reproducción asexual solo se reproduce un
individuo y los descendientes son idénticos al
progenitor.
3. Ejemplos de reproducción asexual
Los seres
unicelulares se
dividen en 2 células
hijas.
Los pólipos crecen
pegados al progenitor
y cuando terminan de
crecer se desprenden
del progenitor
4. Las plantas asexuales
Las plantas
asexuales se pueden
reproducir de dos
formas:
-Mediante tallo o raíz
-Mediante esporas
5. La reproducción sexual
En la reproducción sexual interviene dos
individuos, los descendientes tienen
características de ambos.
Se desarrolla en tres fases: formación de células
reproductoras, fecundación y el desarrollo del
cigoto.
6. Formación de células reproductoras
Llamadas gametos.
Los órganos
reproductores
femeninos producen
gametos femeninos y
los masculinos
gametos masculinos.
Los órganos femeninos
son los ovarios y
producen óvulos.
Los masculinos que
son los testículos
7. Fecundación
Es la unión de un
gameto femenino y
uno masculino para
formar una única
célula llamada cigoto.
Puede ser externa
(fuera de aparato
reproductor de la
hembra) interno
(dentro del aparato
reproductor)
8. El desarrollo del cigoto
Origina al
descendiente.
El cigoto originado en
la fecundación se
llama embrión que es
la cría en las primeras
etapas de su
desarrollo.Puede
completar su
desarrollo de 2
formas dentro de un
huevo o dentro del
9. La polinización
Es el viaje de los
granos de polen de
una flor hasta el
pistilo de otra flor del
mismo tipo.
El polen no puede
desplazarse solo
necesita algo que lo
transporte como los
insectos o el viento.
10. Partes de una flor
Las flores tienen
cuatro partes: pistilo,
estambres, cáliz y
corola.
Pistilo,en el ovario se
encuentran los óvulos
Estambres,en sus
extremos se forman
los granos de polen.
Cáliz,está formada
por unas hojitas
11. Germinación de la semilla
Cuando una semilla
queda enterrada y
encuentra las
condiciones de
humedad y
temperatura
adecuadas germina
(rompe la capsula
que la rodea y el
embrión se desarrolla
y forma raicillas y
hojillas)