Biology S.p.A: Celery and chalk in red liquid -.-
zzz
Wednesday 30 March 2011
Sunday 27 March 2011
La langue chinoise est particulièrement difficile à apprendre.
La langue Chinoise est particulièrement difficile à apprendre. (I agree to a very large extent !!!)
Tuesday 22 March 2011
Audio Equipment used in the hall
I would like to share about the Audio Equipment used in the hall. I made some observations :
The main speakers: 8x YAMAHA C-112 (4 in front and 2 on each side = 8) These are quite popular; you see them everywhere. They deliver 350 Watts @ 8 Ohms of power from a 12 inch two way speaker. They are quite durable and can last a long time. It costs about $500 each, reasonable in price.
For our rehearsal today, we used 3 Audio Technica microphones and a dynamic microphone. (Knew it ... Somehow, Audio.T microphones seem to be used everywhere, including live concerts) I believe the microphone we used were the Line + Gradient Condenser / Shotgun types, because they are very long ( >11") and cylindrical in shape. I think they are the
AT835b mics. These are (DISCONTINUED). The new model is AT8035 The microphones were used for overheads for each section. The condensers are quite good.
There are also 2 wireless microphones by Shure ( Shure SM58 Microphone w/ PGX2 Handheld Transmitter ) These are for vocals. Shure is good brand too.
Unfortunately, the only complaint is that the volume is too soft. The reason being:- there are only 4 microphones for the whole orchestra. Then again, audio equipment is expensive and it would be unreasonable to expect more microphones.
I think the Royer SF-24 Stereo Active Ribbon Microphone is a good overhead microphone. Place it over the conductor's head :P It is an excellent location for getting a realistic audio picture of the orchestra . (Single mic-technique)
R-122 /R-122V Microphone(
$1,895.00,
$2,995.00
)!!!
is a really good microphone. They can also be on a
Decca tree. :)
The musician to mic. ratio would be at least 4:1 -Overheads on different instruments.
Imagine
)SF-24V(
)
SF-24V(
Tube Stereo Ribbon Microphone
List price: $6,195.00 :|
Tube Stereo Ribbon Microphone
List price: $6,195.00 :|
If you want to compare sound quality:
Take a look at this:
and you would be astounded at how many microphones they use, even for a small orchestra. If our school were to have that many microphones, it would go broke !!!
Maybe $40,000 just on microphones alone ???
As for the venue acoustics, don't expect too much. When it is empty, you can hear some reverberation. But when it is filled, the acoustics change too. The rear wall is triangular, meaning the roof is angled downwards towards the stage. It would be good if acoustic panels can be installed at the rear wall.
Artist Impression of Anglican High School
The Principal plans to change the façade of the school. They include the main school gate and some other areas like a study corner.
I didn't think the main gate was all that great. It's only redesigned with a different theme ( school crest etc.). Also, the land area of the school has not really been made use of fully; the location of the buildings.
A school should have columns incorporated in the building façade :)
Friday 18 March 2011
Chemistry
I'm reading Energy Changes :)
H =U +pV
ΔH=Q
ΔH means enthalpy change measured in (kJ) Q is the energy added to the system through heat
Mole is also involved here, when doing calculations in equations.
Exothermic: Heat given out Endothermic: Heat absorbed
Bond energy- energy needed to break a chemical bond. (kJ)
Breaking bonds-require energy Forming new bonds gives out energy
====Do the calculations here (Calculate ΔH) =======
Activation energy:-Minimum energy that reacting particles must posses for a chemical reaction to occur.
ON TO MORE SOMETHING MORE FAMILIAR
FUELS ( I've done a report on this before -.-)
-Substance that burns in air/oxygen to produce heat energy -Exothermic Fire----Heat, Fuel, Oxygen (Take out one, no fire produced)
Good Fuel: Easy to ignite, not not easily flammable Easy Storage + Transport Little Pollution Efficient in producing heat Cheap, Abundant Safe
Sources of fuel: -Coal -Crude oil -Natural gas ( formed by heat and pressure on the remains of plants and animals millions of years ago)
Coal-mainly Carbon C + O2 ------>CO2
Natural gas-methane Excess oxygen (Methane is limiting) CH4 (g) + 2O2 (g) → C (g) + 2 H2O (l) Insufficient Oxygen ( Oxygen is limiting) 4CH4 (g) + 5O2 (g) → 2CO (g) + 8 H2O(l) + 2C (s)
Crude oil- mixture of hydrocarbons, separated by fractional distillation. Hydrocarbon with more carbon atoms has a higher boiling point that one with fewer carbon atoms. Hydrocarbon with more carbon atoms collect at the bottom.
It's connected to Thermodynamics.
Fossil Fuels comparison Also included: Alternative Fuels eg. Hydrogen Fuel Cell. |
Thursday 17 March 2011
Basic Studio Set-up
If you are into home studio, these are the basic equipment you will need.
1. Software for recording
2.USB / FireWire Audio Interface
3 Microphones
4. Studio Monitors / Monitor Headphones
5. Midi controller or Synthesizer
If you are a beginner, that should suffice. Some other factors to look into include:
Sound Isolation, Room Acoustics, etc.
Sound isolation includes making sure that minimal sound leaks from your room. It is equally important that external sound does not interfere with your recording studio.
"A chain is only as strong as its weakest link"
You can mount acoustic material/padding onto walls to absorb sound. Careful placement of soft furniture and the use of carpets would help.
As for doors, the best option would be to have recording studio doors. They have multiple layers and have a Sound transmission class of >50. They are quite heavy too. That, coupled with a double door "airlock system" would ensure that sound produced would be contained.
This creates another problem----ventilation. If you make your studio airtight, you also need a ventilation system that is quiet enough for use in the studio. If not, having air conditioning and airing the room periodically would work.
Room Acoustic:- Don't use a square room. Square rooms would result in standing waves, not something you would want in a recording studio. Rectangular rooms would be better.
Try to have a high ceiling.That would be better for the acoustics of the room.
Have the studio isolated from other parts of your house
Make sure that the room is big enough ( has length and width)
You can try experimenting with corner absorbers / traps. They are acoustic panels that are placed at corners to reduce echoes. Vary the angle of placement until you get satisfactory acoustic performance.
Monday 14 March 2011
Friday 11 March 2011
Chemistry
¨Reversible Reactions: The Haber Process; Chemical and Physical Properties of Ammonia Gas and Ammonium Compounds; Uses of Ammonium Compounds.
¨Composition of Air; Air Pollutants; Reducing Air Pollution; The Carbon Cycle; Global Warming and Climate Change.
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