Talk:Electromagnetic pollution

I.Introduction

Nowday technology are in pointing station we use many equipement works with électricity

II. What is Electromagnetic radiation or electromagnetic Field.

Recall that there are only four types of forces which exist in the Universe. (This is neat because if we can understand these four ways in which things in the Universe interact with each other, then we can understand everything which happens in the Universe!) The four are the gravitational, electrical, strong (nuclear), and weak forces. EM radiation is due to the electrical force.

Suppose that I have two electrical charges sitting in the Universe. For definiteness, let one charge be positive and one be negative so that the two charges attract each other. The strength of the attraction is

Force = constant x q x Q / (separation squared)

So, for fixed charges q and Q, the strength of the attraction is determined by how far apart the charges sit. If they are close then the attraction is strong. If they are far apart then the attraction is weak. Now let us perform an experiment. Suppose that I take charge Q and jiggle it around. The jiggling will cause the distance between the two charges to vary. This means that the strength of the electrical attraction between the two charges will vary. But now, let me ask the question,

How does the charge q know that I am jiggling charge Q around?

Or stated in a different (and leading) way, how does charge q know that I am disturbing the electrical attraction (field) due to charge Q? Well, what happens is that by moving around charge Q, It cause a disturbance which generates a wave (an electromagnetic wave) which propagates through the Universe carrying the information that I made an electrical disturbance. Physically, this is all that electromagnetic radiation is.

III.The nature of electromagnetic Field

Earth has a natural electromagnetic field produced by Earth itself, by the atmosphere, by the sun and by the space surrounding it. As a result of technological progress, this natural field has been further strengthened as a through the addition of fields generated by sources related to anthropic activity. Electromagnetic pollution is prevalently caused by non-ionising radiation in the frequency range from 0 to 300 GHz, generally emitted by telecommunication and radio communication installations and by the systems used to produce and distribute electric energy (power lines, transformation cabins, domestic appliances, etc.). The electromagnetic spectrum does not only includethe 300 GHz frequency range, but also infrared, visible light, UV and ionising waves (radioactivity).

III.1.Telelecommunication

Electromagnetic field is caused in telecomunication by:

III.2.Radio communication installation.

III.3.Electric line distribuation.

IV.effects of radiation electromagnetism on the life --

V. the possible solution

V.Conclusion

INTRODUCTION

Electric power is a fact of our life, a familiar miracle. Generations have come to take for granted the simple flip of a switch that turns night into day. With electric power, however, come certain precautions that are also well known. Electric power lines, household wiring, and appliances can cause serious injury from electric shock if handled improperly and are sources of magnetic pollution. what the electromagnetic pollution is exactly? Recently,a new question has emerged about the electric power we all depend on: Does it constituate a problem of health for us and our environment? Here are as many questions which we will try to answer.

I.ELECTROMAGNETIC POLLUTION, WHAT IS EXACTLY?

Electromagnetic pollution is cconstitued by the electric and magnetic field which are present in our environment and which have not a natural origin: - the electric fields are produced by the electric charges, moving or not; - the magnetic fields are produced by the variable electric fields and by the electric charges on moving (electrical currents); - the electromagnetic fields and waves are electric and magnetic fields which can't be considered any separately and which oscillate in time.

II.SOURCES OF ELECTROMAGNETIC POLLUTION :

The sources of electromagnetic pollution are varied.The main are:

II.1. POWER LINES: A noticeable source of extremely low frequency radiation is the high voltage electrical transmission lines, which in some instances produce such high losses that they bend the earth's ionosphere. Lines transporting 750,000 volts are quite common and there are some running at 1,500,000 volts. Power lines are dangerous because they are constantly losing energy. Because you can't see electricity, and you don't have a detector, you can't see it oozing, but it is. Forty per cent of electricity in Canada is lost in the environment. If you have an extremely low frequency spectrum analyzer, you will find that extremely low frequency fields go very far, even at long distances, and the intensity will be quite significant biologically for long term exposures.

II.2. SOVIET and U.S. EXTREMELY LOW FREQUENCY (ELF) EMISSIONS:

Almost daily, since 1976, ELF magnetic and electric emissions have been pulsed from a number of USSR installations at the rate of approximately 10 Hz. Since mid-1979, the U.S. have been pulsing similar emissions at the rate of approximately 10 Hz and 30 Hz. A major study has been done for the United States Navy at Laurentian University to discover what happens when extremely low frequency fields, similar in fact to those used by the Soviet Union since 1976, occur in front of brain cells. Everyone was saying, come on, the Soviets are only doing radar, it's not going to affect any place in North America. But it did. This study actually showed that when brain cells are subjected to the Soviet level of emissions, degranulation takes place after a very short exposure. This study so shocked the Pentagon that since that time in 1985, the United States government has made a full scale very expensive secret study on how to protect North American citizens from Soviet emissions. Fortunately when Reagan and Gorbachev met in New York, they shook hands and the Soviets turned off the emissions.

II.3. SATELLITE DISHES:

Another case of electromagnetic pollution is satellite dishes. Main or secondary power lines in the vicinity may actually be amplified by the satellite dish. If antennas of satellite dishes are pointing at a certain angle, even partially towards a power transmission line, they will actually absorb and focus its frequency, and once it is captured, it will travel vertically above or below the dish. It can also pick up and augment the Bell Canada System and microwave communication between buildings.

II.4. CELLULAR TELEPHONES:

Portable and car telephone systems also amplify surrounding fields. Do not use these telephones unless you really have to. Some people have a tendency to put a whole day through on this device and can suffer detrimental effects such as loss of concentration and memory. So be very careful with them.

II.5. RADAR SITES:

Never stay near a radar site even when it is off. Some people just go crazy. Radar sites augment all kinds of electromagnetic fields. Radar is a serious problem especially when the radar frequencies are changed, but are still in the same frequency range. That sudden change can be too much for the body and may trigger a whole series of problems. We know soldiers who have not been able to stand this. There is a massive pollution problem in Annapolis Valley, Nova Scotia, partially linked to a radar station operating since 1982 near Forest Glade,that no longer needs to be there. Suddenly, from being one of the most benign places in Canada, it has become the cancer hot spot. The infant mortality rate is high, multiple sclerosis has become a serious problem and some flocks of geese are no longer able to lay fertile eggs.

II.6. VIDEO DISPLAY TERMINALS:

In a video display terminal, there are various sources of problems; however, the major problem is the fly back transformer. It can produce stronger fields than if you are near a substation. And that's a very intense field, 50,000 volts or more per meter. If you keep a distance of about 70 cm away from the modern types and if there are no other VDT's around, that should be o.k., but you should not be in the rear of a VDT. That is the worst place. Appliances such as VDT's produce voltages of up to 10,000 v/m in the older models, and 5 to 50 v/m for newer models, and 300,000 nT magnetic flux at operating distance. The governments of Germany, Sweden and Norway have accepted safety standards for video display terminals which have been determined by our organization, and have made their terminals less dangerous. Six hundred studies done over the last 20 years have shown that electrical fields, up to 6 volts per meter and magnetic fields up to 64 nanoteslars are safe, and this should cause no biological interaction, even for very long term exposure. It only costs about 10 cents more to make them safe, but for years, many governments have refused to do anything about it. Only one company in America changed their systems, and that was IBM, who have met our safety guidelines since 1981 when we established that higher levels are dangerous. One of our founders was the scientific advisor for IBM at the time.

II.7. POLLUTION IN THE AVERAGE HOME:

In our homes and offices, all of our electrical appliances produce not only electrical but also magnetic fields, even when they are "off". For example, a television set will still produce quite strong fields even when it is off, as long as it is plugged into the electric supply. The same is true of lamps, typewriters, photocopiers, fluorescent light fixtures, video display systems, telephones, extension cords and unused electric wires inside walls. Sometimes the difference between "off" and "on" is negligible once plugged in and drawing on the power supply.

III.EFFECTS OF ElECTROMAGNETIC POLLUTION (http://www.healthy-house.co.uk)

It is dangerous to be exposed to electric transformers or to work on power line repairs even for short term exposures. Even if you are living quite some distance from a power line, that is if it is within sight and sufficiently noticeable (not just a speck on the horizon), long term ext is dangerous to be exposed to electric transformers or to work on power line repairs even for short term exposures. Even if you are living quite some distance from a power line, that is if it is within sight and sufficiently noticeable (not just a speck on the horizon), long term exposure may be dangerous. Very often we have found that secondary transmission lines, the kind you see in streets, are much worse polluters than the huge power lines. The human body is a living antenna and can absorb strong fields like power lines or video display terminals, and then augment the intensity of the environment. Animals also augment the intensity of the field. So what might have been a safe situation, like a school full of children and workers near a power line, can become a tremendous new source of electrical energy and a major polluter, not only to the children in the school, but even to people living near the school. posure may be dangerous. Very often we have found that secondary transmission lines, the kind you see in streets, are much worse polluters than the huge power lines. The human body is a living antenna and can absorb strong fields like power lines or video display terminals, and then augment the intensity of the environment. Animals also augment the intensity of the field. So what might have been a safe situation, like a school full of children and workers near a power line, can become a tremendous new source of electrical energy and a major polluter, not only to the children in the school, but even to people living near the school.

At work, a large proportion of people spend the majority of their day on a computer and surrounded by electrical machines. All these electrical appliances give off electrical fields. Generally, electromagnetic fields can be biologically active, capable of making changes in the structure of human and animal cells which are exposed to them. electromagnetic fields can sause stress. Symptoms of electromagnetic stress vary considerably. Some people merely experience a feeling of lethargy, lack of concentration and fatigue, particularly when using the computer. Others have much more severe reactions to this form of pollution and studies have even linked electromagnetic fields to childhood leukaemia. Symptoms of electromagnetic stress include fatigue, lowered immune system, decrease in work capacity, speed and concentration, joint pain, psychological problems, depression, insomnia, lethargy or sometimes a tingling in the fingers. Electromagnetic pollution is becoming a serious health problem for many people. this pollution, due generaly, to the proliferation, in the industrialized countries, of the machines, the apparatuses producing or using electricity, causes slow and progressive electrocution of the human organisms and plays a significant role in the diseases known as of civilization: rheumatic, cardiac, neurological affections.

III. HOW TO PROTECT ONESELF AGAINT ELECTROMAGNETIC POLLUTION

As you know, we are constantly bombarded by many frequencies from microwaves to cell phones and computers. Some people are more sensitive to these than others. If you find yourself affected by your computer or other electromagnetic producing devices, the purple plate may just be the thing to help you out.

M. CONCLUSION

Electromagnetic pollution became nowadays a problem of public health.