Sunday 19 May 2013
Water Issues in Bangladesh By Nathan Smith and Ethan Daniels
The Hamilton Jet By Scott Hawkins
The Jet unit Is one of the most awesome inventions ever
made, it involves powerful motors and high speed propellers to make it go. How
a jet boat works is the motor spins a propeller insider a cylinder that sucks
water in from the bottom of the boat and propels it out the back end through a
nozzle that can turn side to side to steer different direction. The Hamilton Jet
was invented in New Zealand By Sir William Hamilton. A waterjet generates propulsive
thrust from the reaction created when water is forced backwards. It works just
as the law, “every action has an equal and opposite reaction" says. A good
example of this is the recoil on your shoulder when firing a rifle.
Here is a video involving Jet units:
Without water Jet boats couldn’t be used and a whole lot of
fun would be missed out on from everyone.
Some of the main recreational uses of a jet boat are;
. Wakeboarding
. Skiing
. Slalom Skiing
. Knee boarding
. Fishing
. and just going for a spin!!!
Shallow Water Blackout By Jackson Heneveld and Josh Hardy
Shallow
water blackout occurs when the O2 levels in the body drop too low and the CO2
levels too high. This causes the body to fall into unconsciousness because of
the urgent need to breathe. When the person is unconscious, they will
automatically breathe in thus causing the subject to drown.
This
promotes serious risks to the person’s health and wellbeing while participating
in these “breathe holding” games as serious harm could be caused to the person.
The signs of a shallow water blackout are not indicative of an upcoming
blackout. In fact there are no physical symptoms of an incurring loss of
consciousness. It could even occur when the individual does not feel the need
to breathe. The medical definition of “shallow water” defines any water above
the depth of 5 metres.
The
discussion around shallow water blackout has come into the spotlight recently.
After deaths involving children without supervision have been recorded in
England and Australia.
The sudden
urge to breath in which happens when the person in context is performing
“Apnea”(breath holding) has built up too much carbon dioxide in their
bloodstream over taking the oxygen level thus needed to be released as a waste.
http://en.wikipedia.org/wiki/Shallow_water_blackout
Water Issues By Nathan Smith
97%
of the people of Bangladesh have access to water, but only 40% per cent have
proper sanitation. With a staggering 60% of the population that has to endure
unsafe drinking water, the nation is in real danger. The availability of this
water greatly fluctuates throughout the year as the warmer season brings
massive amounts of water in frequent monsoons and the cooler season brings
drought. The infrastructure cannot adequately deal with the barrage of water in
monsoon season so the water is not saved for the drier months. Of the water
that is available, well over 80 per cent of the water is used for agriculture.
Links:
Tidal Power By Lachlan Crawford
There are many
different types of Tidal Energy. The tidal dam is the most common one. It traps
water in a holding pen twice a day when the tide comes up and then slowly lets
it out until the tide comes up again, creating power. They are usually built in
areas where there is quite a lot of difference between low and high tide, so
usually in an estuary of some type of reservoir. The problem with this is that
it cannot capture very large amounts of water, so not a whole lot of
electricity is created and it can cost a lot of money and damage the
environment. However, there are a few more experimental ways.
The second way is to harness the underwater currents with
the turbine above. These are experimental turbines in County Down, Northern
Ireland. Each one generates 22.53 megawatt hours of electricity every day. They work by the tides moving the rotors. As
the rotor pole is movable, it would be able to move to the right position to
create the most energy as possible. I recon these are a very economical idea.
The final one I’m going to look at is the UK’ first wave-power plant, called the
Sea Snakes. These things are 142m long, have a diameter of 3.5m and are made
from 700 tonnes of carbon steel. But how does this mammoth machine work? It is
made in four articulate sections, meaning they freely move around. At each
joint there is a wave converter. A hydraulic ram is moved in and out by the
wave moving the joints, and the wave converter turns this into energy. At peak output they can produce 750KW of
power each and they are usually in groups of about two or three. At the moment
they are only in use around Briton as this technology is relatively new.
Thursday 16 May 2013
The Water Cycle By Bryce Taylor
As you should know by now, water falls from the sky
as rain, this rain accumulates as things such as puddles and rivers but copious
quantities of it can cause flooding.
Also I’m assuming that you have taken notice of that
big, bright, fiery thing in the sky called the Sun? If not look out your window
(we do not advise or recommend that you
look at the sun). The Sun’s rays (of light and heat) Heat up water until
it’s particles spread apart and become a gas, this is called evaporating the
gas (water Vapour) rises into the air where it accumulates again but as clouds,
yes those big white or grey fluffy things in the sky aren’t sheep they are
large amounts of water vapour that are blown about in the sky by wind, when a
cloud begins to gather too much vapour it becomes dense and visibly grey, the
vapour in these grey clouds bunches together until it returns to its liquid form
(water) that then falls to earth due to gravity where it accumulates as puddles
and rivers and repeats the process over and over, but some clouds release their
water droplets on mountains where most of it hardens even more and forms
ice/snow that eventually melts and runs down the mountains to create rivers
that gain water that evaporates and the process repeats, if you’re confused as
of what this means read this over and over until you get it, or ask someone who
cares.
The Water Buggy By Max Chaiteerasuwet, Ben Scott and Angus Halligan
The Water-Buggy is mainly a water machine with
beautiful looks and an energy efficient motor(s), powered by a wind turbine.
The engines are smaller jet engines with a hatch to block out water when you’re
under water (submarine mode) feature, as the wind powered turbines power you
along your solar panels on the back of your buggy store energy. The stored
energy powers your car when you are under water. Inside the car there are
enough seats for 6 people, a medical supply kit; an air supply tank so you can
breathe fresh air if it’s bad weather conditions outside or such, there is also
a storage compartment at the front of the car (boot) and a nice vinyl interior.
The main concern is for the people who make: Aeroplanes, boats (all things that
help you get over water), well our company has given all these people jobs at
our new production plant. People may still use other forms of transport if they
want to but they have a choice of transport if they want to, we mean who is going
to stop someone buying form us E.G. say if someone was to buy a lollipop they
could choose what flavour and company. $159,999 is our company’s starting price
for our fabulous product. Why so costly? Because the future is here and if you
think about it this vehicle could potentially save you lots of money, because
you’d save on plane tickets, boat tickets and for those who buy boats you’d
save on buying the boats (and fuel for some types of boat).
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