miércoles, 23 de abril de 2014

TIDAL ENERGY


METALLIC MATERIALS


1. TRANSLATE INTO ENGLISH

Aleación: Alloy
Hierro: Iron
Cobre: Copper
Cinc: Zinc
Plomo: Plumb
Estaño: Tin
Aluminio: Aluminium
Mena: Ore
Ganga: Slag
Acero: Steel
Cromo: Chrome
Níquel: Nickel
Arrabio: Cast Iron
Alto horno: Blast Furnace
Fundición: Casting
Latón: Brast
Bronce: Bronze
Alpaca: Alpaca
Titanio: Titanium
Magnesio: Magnesium
Oro: Gold
Plata: Silver
Platino: Platinium


MEANS OF TRANSPORT//PARTS OF A CAR

MEANS OF TRANSPORT

BUS
SHIP
CAR
BICYCLE
CARAVAN
MOTORBIKE
SUBMARINE
LORRY/TRUCK
PLANE
TRAIN
HELICOPTER
TRICYCLE
TRAM
ZEPPELIN/AIRSHIP
BOAT
TRAIN STATION
BUS STATION
AIRPORT
PORT/HARDPORT

PARTS OF A CAR

ACCELERATOR
BATTERY
BOOT/TRUNK
BONNET/HOOD
BRAKE
BUMPER
CLUTCH
DASHBOARD
EXHAUST PIPE
HANDBRAKE
HORN
HUBCAP
REARVIEW MIRROR
ROOF    RACK
SEATBELT
SPEEDMETER
STEERING  WHEEL
TYRE/TIRE
WHEEL
WINDSCREEN
WINDSCREEN  WIPER
LICENSE PLATE
GLOVE COMPARTMENT

martes, 22 de abril de 2014

NUCLEAR ENERGY


Nuclear energy originates from the splitting of uraium atoms in a process called FISSION. At the power plant, the fission process is used to generate heat for producing steam, which is used by turbine to generate electricity.


Main components of a nuclear reactor

Core – It’s the focal point of the reactor, where fuel is contained and nuclear fission reactions take place.
Fuel – Generally, fuel is made of small enriched uranium oxide rods, stacked so as to form cylinders. These rods are wrapped in metal sheathes (steel or zirconium alloy), which allow heat to pass through while blocking the radioactive elements produced by fission.
Moderator – This is a material placed in the reactor to slow down the neutrons produced by fission, in order to reach the most suitable speed allowing the chain reaction to continue.
Heat-transfer fluid (or coolant) - This fluid (liquid or gas) cools the core and carries outside the heat that is produced there. The most commonly used fluid is water.
Control rods – These are rods used in specific materials (silver, indium, cadmium or boron carbide) to control fission inside the core. 
Vessel – The large steel recipient containing the core, the control rods and the heat-transfer fluid.
All the components of the reactor are container in a solid concrete structure that guarantees further isolation from external environment. This structure is made of concrete that is one-metre thick, covered by steel. The most recent reactors sometimes contain two containment structures and are designed to defy all types of accidental events, even the impact of an aircraft.

https://www.youtube.com/watch?v=_UwexvaCMWA

NUCLEAR REACTOR



martes, 8 de abril de 2014

SOLAR POWER PLANTS

These plants use the energy from the sun. There are two main types of installations: photo-thermal and photovoltaic power plants.

Photo-thermal power plant

In this type of power plant, the heat generated by solar radiation produces steam that is used to move the rotor in the generator.

To do this, they use special mirrors, called heliostats,  that reflect sunlight and concentrate it at one point, where it reaches a high temperature.

https://www.youtube.com/watch?v=NDZzAIcCQLQ


Photovoltaic power plant

In these power plants, solar radiation is transformed directly into electricity by panels of photovoltaic cells.
These power plants consist of large areas of photovoltaic panels.

jueves, 6 de marzo de 2014

RESISTANT ELEMENTS IN STRUCTURES

VERTICAL
PILLAR: a larg post that helps to holp up something (roof  or building)


COLUMN:  a long post made of steel, stone, marble, etc., that is used as a support in a building

HORIZONTAL


BEAM:  a long piece of heavy often squared timber suitable for use in buildings.


JOIST: small beam.


FOUNDATION

FOOTING:  an elargement at the lower end of a foundation in a wall, pier or column to distribute the load.

SLAB: a flat rectangular architectural element that is usually formed of a single piece of mass: concrete.


WRITE THE NAME OF THE FOLLOWING ELEMENTS

1. 

2.

3.

4.

5.

6.

7.





miércoles, 5 de marzo de 2014

PULLEY

1. FIX PULLEY

A fixed pulley is a wheel that has a groove around it into which a rope, chain or belt fits. It rotates around an axle that is fixed to an inmobile surface.

A fixed pulley is ballanced when the effort F is equal to the resistance of the load, R:




       F=R

2. MOVABLE PULLEY

A movable pulley is a set of two pulleys- one is fixed while the other can move in a linear direction.

A movable pulley is balanced when it satisfies this equation:
       
            R
F = -----
        2

3. COMPOUND PULLEY

This is a system of fixed and movable pulley, often called block and tackle.

        R
F=--------
       2n
n= number of movable pulleys.



lunes, 24 de febrero de 2014

SIMPLE MACHINES


Click on the following links to watch  the videos.

Three classes of levers

Types of levers




Exercise

Sammy weighs 9000 kg and Jane weighs 6000 kg. They are both sitting on a seesaw. If

Sammy is seated 6 meters away from the fulcrum, how far should Jane be from the fulcrum?. When solving the problems, draw a diagram of the situation and show your math work.

jueves, 20 de febrero de 2014

WOOD- ACTIVITIES

COMPLETE THE FOLLOWING ACTIVITIES:

1. What are the two main substances that wood is composed of?

2. If we cut a tree, in the cross section we can see these different five parts. Write  and draw them.

3. - The .................. are the lines in pieces of wood.
    - A ...................... is the main part of the tree without branches after cutting it.
    - The ...................... is the part  that protects the tree from wind, rain, insects, etc.
    - A ....................... is a small branch.
    - The singular of leave is ..................


4. True or false?
         - Wood is denser than water.
         - Wood is a good thermal insulator.
         - Wood is a good electric conductor.
         - Wood is not a biodegradable material.

5. Write the seven steps to process wood (from cutting the tree to plane it).

6. Write three characteristics of hardwood and  three of softwood.

7. Write four examples of hardwood and four of softwood.

8. What are the four types of prefabricated wood products?
     

miércoles, 19 de febrero de 2014

HOW TO PROCESS WOOD

The process starts with the extraction of the log (raw material) from the forest and ends with the production of planks.

STEPS

1. Cutting
2. Pruning
3. Transport
4. Removing the bark
5. Sawing
6. Drying
7. Planing