miércoles, 17 de diciembre de 2014

PLASTIC. CLASSIFICATION


There are two main types of plastics and these are named Thermoplastics and Thermosetting Plastics.

Thermoplastics are made up of lines of molecules with few cross linkages. This allows them to soften when heated and to be bent into a variety of shapes and forms. They become stiff and solid again when cold. This process can be repeated many times. The bond between the molecules is weak and become weaker when reheated, allowing reshaping. Thermoplastics tend to be composed of 'long chain monomers. They can be recycled.


Thermosetting Plastics are made up of lines of molecules which are heavily cross linked. It creates a rigid molecular structure. They may be heated the first time and shaped but they become permanently stiff and solid. They cannot be reshaped again. The molecules of these plastics are cross linked in three dimensions and this is why they cannot be reshaped or recycled


PLASTICS

                                    DEFINITION OF PLASTIC

Plastics are man-made materials. Plastics have taken the place of traditional materials like woods and metals.

Plastics differ from other materials largely because of the size of their molecules. Most materials have molecules made up of less than 300 atoms, plastics contain thousands of atoms. We call them Macromolecules.

Some plastics are derived from natural substances such as animals, insects and plants but most are man-made. These are named Synthetic Plastics.
The first plastic based on a synthetic polymer was made from phenol and formaldehyde, with the first viable and cheap synthesis methods invented by Leo Hendrik Baekeland in 1909, the product being known as Bakelite.
Most synthetic plastics come from crude oil but coal and natural gas is also used. 

Monomers are chemical substances consisting of a single molecule. Thousands of these are linked together in a process called Polymerisation to form new compounds called Polymers. They are composed of organic condensation or addition polymers and may contain other substances to improve performance or economics. The vast majority of plastics are composed of polymers of carbon and hydrogen alone or with oxygen, nitrogen, chlorine or sulfur.

lunes, 15 de diciembre de 2014

UNIT 3. MATERIALS. VOCABULARY




A
Ash
Aluminium
Ash
B
Birch
B eech
Branch
Bark
Broadleaf
Bronze
C
Chesnut
Copper
Cotton
Cork
D
Deciduous tree
E
Elm
Evergreen tree

F
Fir
G
Growth  rings
Gold
Glass
H
Heartwood
Hardwood
I
Iron
L
Leaf
Leaves
Leather
M
Metal
N
Needle
O
Oak
P
Pine
Poplar
Petroleum
Plastic
R
Roots 
Rubber
S
Stem
Seed
Steel
Sapwood
Softwood
Sap
Silver
Stone
Silk
T
Timber
Tree
Trunk
W
Wood
Wooden
Walnut
Wool






lunes, 20 de octubre de 2014

VOCABULARY EXAM TECHNICAL DRAWING

1. TRANSLATE INTO ENGLISH

1. PERPENDICULAR:PERPENDICULAR
2RADIO: RADIUS
3. PLANTILLA: STENCIL
4. HIPOTENUSA: HYPOTENUSE
5. BOCETO: SKETCH
6. CROQUIS: OUTLINE
7. MEDIDAS: MEASUREMENTS
8. SCALE: ESCALA
9. AMPLIAR: ENLARGED
10. SCALIMETRO: SCALE RULER
11.PERFIL DERECHO: RIGHT SIDE
12. ALZADO: FRONT VIEW
13.PLANTA: TOP VIEW
14. PELIGROSO: DANGEROUS
15.SEÑAL: SIGN
16.FORMA: SHAPE
17.TAMAÑO: SIZE
18. TRANSPORTADOR DE ÁNGULOS: PROTRACTOR
19. DIBUJO TECNICO: TECHNICAL DRAWING

20. CINTURÓN DE SEGURIDAD: SAFETY BELT

viernes, 19 de septiembre de 2014

BASIC TERMINOLOGY IN TECHNOLOGY

Technology
Practical use of knowledge, extend abilities, satisfy needs /wants & solve problems.
Design
The process of creating things by planning.
Innovation
The process of improving and changing a technology that already exists.
Invention
The process of designing new products.
Criteria
In the design process, things that the product must do or include.
Brainstorming
Group members suggest ideas out loud as they think of them.
Prototype
A working model.
An Engineer
Uses knowledge of science, math & technology to solve technical design problems.
What Technology Does:
Transforms resources into products and services and solves problems.

Units of measure

UNITS OF MEASURE CHART

METRIC UNIThttp://www.abcteach.com/free/m/measurement_chart.pdf

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