The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the atmosphere and downwind. Two Chernobyl plant workers died on the night of the accident, and a further 28 people died within a few weeks as a result of acute radiation poisoning. The April 1986 disaster at the Chernobyl nuclear power plant in the Ukraine was the product of a flawed Soviet reactor design coupled with serious mistakes made by the plant operators. It was a direct consequence of Cold War isolation and the resulting lack of any safety culture. The accident destroyed the Chernobyl 4 reactor, killing 30 operators and firemen within three months and several further deaths later. Acute radiation syndrome was originally
Solar power What is solar power? Solar power is the energy, which is derived from solar radiation energy. Mainy used to heat and power production, but as well as natural lighting. Solar power released as a result of fusion reactions taking place in the sun. What is solar power? Päikeseenergia on energia, mis on saadud päikesekiirguse energiast. Põhiliselt kasutatakse seda soojuse ja elektri tootmiseks aga ka loomulikus valgustuses. Päikeseenergia vabaneb päikesel toimuvate termotuumareaktsioonide tulemusel. Using heat production
It can create power for heavy manufacturing (Buzz, 2009) · Nuclear wastes can be reduced through waste recycling and reprocessing (Buzz, 2009) NUCLEAR ENERGY · Can be produced in very small amount of volume and that makes it easy to transport ("Pros of nuclear," ) · Nuclear power plants have a big income, it helps to create more jobs and the countries to overcome the struggle with its bad economy Cons: · High construction costs because of radiation and complicated procedures and long construction time (Buzz, 2009) · Accident risks for example Chernobyl, Ukraine in 1986 or Fukushima, Japan in 2011 and radiation can cause serious health problems · Nuclear weapons may cause tension between different countries · Uranium is hard to get and expensive to mine, refine, and transport, and produce considerable environmental waste (including greenhouse gasses) during all of these procedures (Buzz, 2009)
for significant amounts of time, giving rise to a nuclear waste problem. Concerns over nuclear waste accumulation and over the destructive potential of nuclear weapons may counterbalance the desirable qualities of fission as an energy source, and give rise to ongoing political debate over nuclear power. What is radioactive decay? Radioactive decay is the process in which an unstable atomic nucleus loses energy by emitting ionizing particles and radiation. This decay, or loss of energy, results in an atom of one type, called the parent nuclide transforming to an atom of a different type, called the daughter nuclide. For example: a carbon-14 atom (the "parent") emits radiation and transforms to a nitrogen-14 atom (the "daughter"). This is a random process on the atomic level, in that it is impossible to predict when a given atom will decay, but given a large number of similar atoms the decay rate, on average, is predictable.
process, after which it can be turned back threshold start of something, border; , doorstep carbon footprint the amount of CO2 emitted due to the consumption of fossil fuels audit to inspect, conduct information about infrared scanner device using infrared radiation and converting it into electronic signal seep leek slowly appliance device, household equipment compact dense, packed together go nuts get crazy about sth, worry agonize undergo mental struggles commute switch over hardship suffering, severe struggle
Biochemistry, Genetics and Molecular Biology; Medicine; Agricultural and Biological Sciences; Energy; Pharmacology, Toxicology and Pharmaceutics. 3) Document type: valisin article 4) Source type: valisin journals 5) Language: valisin English Relevantsed artiklid: 1) Preliminary risk assessment of radon in groundwater: a case study from Eskisehir, Turkey 2) Prevention measures against radiation exposure to radon in well waters: Analysis of the present situation in Finland 3) Radon in drinking water and cancer mortality: An ecological study in Japan 4) Temporal changes in water quality at a childhood leukemia cluster 5) Health risk by radon in drinking and sanitary water: Assessment and control techniques 6) Kriging radon concentrations of groundwaters in western ardennes
Kuressaare Ametikool Ehitus ja materjalitöötluse õppesuund Tisler Heigo Näälik T2 TUUMAPOMM Referaat Juhendaja: Ain Toom Kuressaare 2010 Sisukord Tuumarelvade ajalugu............................................................................................................................ 3 Võidurelvastumine................................................................................................................................. 4 Tuumapommide liike.............................................................................................................................. 5 Plutooniumipomm.................................................................................................................................. 5 Vesinikupomm ...........................................................................
Radioaktiivne saastumine Robert Derevski 12E Ülevaade · Ääretult ohtlik saaste liik · Radioaktiivsuse mõõtmisühik Sv, norm 2-8 mSv aastas · Igas riigis erinev radioaktiivsuse tase, Eestis 2,5 mSv/a Ukrainas kuni 15 mSv/a Soomes kuni 9mSv/a Ülevaade · Radioaktiivsus keskkonnas: looduslik (uraan, plutoonium) tehislik (tuumarelvad, -jaamad) · Ohtlikud radioaktiivsed isotoobid (tuntumad nt. strontsiumi, tseesiumi, koobalti isotoobid) Saastumise põhjused · Radioaktiivse pilvega kaasnevad sademed · Inimviga radioaktiivsete ainete käitlemisel · Tehnogeensed katastroofid · Tuumarelvade kasutus/katsetamine Saasteallikad Eestis Endised saasteallikad: · Paldiski tuumaalveelaevade baas · Sillamäe uraanikaevandus Hetkel aktiivne: · Tammiku radioaktiivsete jäätmete hoidla (endise nimega Saku) Mõju · Elusorganismidel kiiritustõbi, pärilikud või kroonilised haigused · Ümbritseva keskkonna radioaktiivne saastatus ja elukõlbm...
Inconvenient Non-ionizing indoor climate Poor radiation lighting (magnetic fields) PHYSICAL HAZARDS Risk of fire and Noise in the working environment: electrical shock Physical
13.10.11 Arvuti kahjulikkus inimesele Pidev töö arvuti taga ei lisa tervist. Tervist tuleb otsida metsast või spordisaalist. Tundide pikkune arvuti taga istumine - kas omal soovil või tööd tehes - toob kaasa hulga ebameeldivusi. Esimest korda hakkasid Kanada õpetlased tõsist huvi tundma arvuti võimaliku kahjuliku mõju vastu inimese tervisele 1984.aastal. Ajendiks said ühe haigla meditsiinilise personali arvutud kaebused. Pärast põhjalikke uuringuid leiti ühene side haiguste ja elektromagnetilise kiirguse vahel. Õpetlased tõestasid, et pidev töö arvuti taga võib esile kutsuda südame-veresoonkonna haigused, häirida kesknärvisüsteemi tegevust, mõjuda raseduse arengule ning alandada tunduvalt immuunsust. Monitoril ilutsev teade "Low Radiation" on loonud müüdi arvuti radiatsioonist. Tegelikult tähe...
This forces the eye to focus constantly and as a result, the eye gets tired quickly. Blue light can cause different eye diseases. One of the diseases is „Dry eye syndrome“. Dry eye syndrome is a collection of symptoms which are caused by a lack of or low quality of the tear fluid. This can not be completely cured but it can be prevented by resting the eyes after every half an hour when using smart devices. Another disease which can be caused by the blue light radiation is Macular Degeneration Disease. Macula is located in retina and the image that is focused on the retina is the sharpest in macula. This is the reason why macula can not be damaged at all to have a correct visual acuity. Blue light damages the light-sensitive cells in retina. Macular degeneration disease can lead to permanent loss of eyesight. Both of these diseases can not be cured but it is possible to prevent them. The best prevention would be to avoid the use of smart devices
PA, Hepworth SJ, Muir KR, Swerdlow AJ, Schoemaker MJ. 2010. Brain tumour risk in relation to mobile telephone use: results of the INTERPHONE international case-control study. International journal of epidemiology 39, 675-694 3. C.I.A. 2009. The World Factbook. Kättesaadav:https://www.cia.gov/library/publications/the-world-factbook/rankorder/2151 rank.html [külastatud 3. november 2010]. 4. De Iuliis GN, Newey RJ, King BV, Aitken RJ. 2009. Mobile phone radiation induces reactive oxygen species production and DNA damage in human spermatozoa in vitro. Public library of science one 4, e6446 5. Eliyahu I, Luria R, Hareuveny R, Margaliot M, Meiran N, Shani G. 2006. Effects of radiofrequency radiation emitted by cellular telephones on the cognitive functions of humans. Bioelectromagnetics 27, 119-26. 6. Levallois P. 2002. Hypersensitivity of human subjects to environmental electric and magnetic field exposure: a review of the literature
g. thunder-storms, squall-lines, meso-scale convective systems) with high reliability, thus this model is run on a 2.5 km horizontal resolution over the Carpathian-basin. The ALADIN and AROME models provide the expected values of meteorological parameters (pressure, wind, temperature, humidity and precipitation) in the future on a three dimensional grid. The forecast methodology is primarily based on hydrodynamics (or atmospheric dynamics), thermodynamics, radiation theory and cloud-physics . UKMO It is a grid-point model with the ability to run with a rotated pole and variable horizontal grid. A number of sub-grid scale processes are represented, including convection, boundary layer turbulence, radiation, cloud and microphysics. It can be run as a global model, or a limited area model and can also be coupled to land surface, ocean models, wave models, chemistry and Earth system components. Kasutatud allikad http://www.ilmateenistus
Solar power Tanel terras The basics of solar power Solar power is the conversion of sunlight into electricity Photovoltaics Concentrated solar power Concentrated solar power · Electrical power is produced when the concentrated light is converted to heat, which Click to edit Master text styles drives a heat engine connected to an Second level electrical power generator or powers a Third level thermochemical reaction Fourth level Fifth level Photovoltaics Photovoltaics (PV) is a method of generating electrical power by converting solar radiation into di...
Tuumapomm Aatompomm · Tuumapomm ehk aatompomm on suure plahvatusjõuga lõhkekeha, kus energia vabaneb raskete aatomituumade lõhustumisel. · Aatompommis kasutatakse U-235 ja Pu-239. Tuumapommis on kaks vastastikku asetatud, aga teineteisest eraldatud radioaktiivse aine (Uraan või Plutoonium) poolkera. Kummagi poolkera mass on napilt alla kriitilise massi (kriitiline mass on mass millest alates algab tuumade lõhustumise ahelreaktsioon). Tuumapommi käivitamisel lükatakse poolkerad plahvatusega teineteise vastu ja algab ahelreaktsioon ehk tuumaplahvatus. Tuumaplahvatus - kontrollimatu ahelreaktsioon kus vabad neutronid tungivad raskemate ainete tuumadesse, purustavad need vabastades tuuma seoseenergia ning muudavad raskemad ained kergemateks. Aatompommi peamised mõjutegurid on lööklaine, valguskiirgus ja radioaktiivkiirgus. Tuumareaktsiooniga käib kaasas radioaktiivne...
Laserravi Mida mõistame sõna all LASER · Light Amplification by Stimulated Emission of Radiation valguse võimendamine stimuleeritud kiirguse abil Laserid meditsiinis · Süsinikdioksiid laser · Argoonlaser · Heelium-neoonlaser · Pooljuhtlaser ehk dioodlaser Laserite tüübid · Ablatiivsed laserid mittekontaktsed · Mitteablatiivsed laserid kontaktsed Laservalgus vs. tavaline valgus · Laseri valgus on monokromaatiline kindla sagedusega · Koherentne lained on ühesuguse pikkusega · Kollimatiivne valguskiir ei haihtu ruumis Näidustused
structure IR- infrared spectrograph It shows us all the functional groups for identification of the subject GC-MC spectrum To interpret (1) and (5) we look at the spectrum and we know that peak with 206 MW is (5) and (1) is 176 MW. (small peaks around the long peak are isotopes different amount of neutrons but same amount of protons) IR Infrared spectrograph In IR spectrum each functional group has a peak. Organic compounds absorb infrared radiation. Different types of bonds absorb infrared radiation at different characteristics frequencies, IR spectrum 2941 O-H ( and C-H strech) ; 1721 C=O ; 1421 O-H bend ; 1269 C-O strech ; 945 O-H bend Quantitative determination UV-VIS 220 nm (ultraviolet light) Molecules containing pi-electrons or non-bonding electrons can absorb the energy in the form of ultraviolet or visible light to excite these electrons to higher anti-bonding molecular orbitals.
• explosive devices • nuclear fallout • damage your blood, cells and organs • special isotopes of uranium or plutonium how it works? • atom • breaking that nucleus • combining two nuclei • large amounts of energy history • Scientist discovered how to create a chain reaction • in the 1930s • Robert Oppenheimer • Manhattan Project • development of the nuclear bomb Nuclear bomb effect • release four kinds of energy 1. Radiation (Cause Disease and will effect the next Generation) 2. Electromagnetic 3. Heat 4. Pressure Hiroshima • Hiroshima was the primary target of the first nuclear bombing mission on August 6, 1945 • “Little boy” • thirteen kilotons • 70 000-80 000 killed • 70 000 injured the destruction of Hiroshima Who has nuclear weapons? video • https://www.youtube.com/watch?v=KH5Q6jbWIoQ • https://www.slideshare.net/qwe78590/nuclear-weapons- 2485685
has suffered a I am nuclear accident AC abandoning AD AN I need a doctor. and is a possible my vessel. source of radiation danger. I need a I need a doctor; Repeat the AN 1 doctor; I have AN 2 I have radiation EL distress severe burns. casualties. position. What is the You should
the case of Jupiter. The atmosphere of Saturn has weak bonds and there is a high haze, perhaps composed of crystals of ammonia ice, above the clouds. Apparent high-speed jet streams were also detected in the atmosphere. Confirming ground-based measurements, the cloud-top temperatures were measured at about -200 degrees Celsius (-330 degrees Fahrenheit), and only about 73 degrees Celsius (130 degrees Fahrenheit) above absolute zero. The Pioneer 11 voyage also discovered radiation belts that are weaker than those of Jupiter. The radiation is absorbed by the rings and moons of Saturn. Cutoffs in the radiation data were used to infer the presence of additional rings and moons beyond those already known from visual observations ("Pioneer 10, 11"). Saturn has more moons than any other planet in the solar system. Nine (possibly ten) of these moons have been detected from Earth. Voyager 1's encounter to Saturn provided several new discoveries about Saturn's moons
Kati Eliisabet Peterson & Pärl Eelma LASER Ajalugu 1917 Albert Einstein 1928 Rudolf Landenburg 1939 Valentin Fabrikant 1951 Joseph Weber Laser ehk optiline kvantgeneraator on indutseeritud kiirguse omadustel põhinev seade, mis tekitab monokromaatilist elektromagnetkiirgust spektri optilises, kas siis ultravioletses, nähtavas või infrapunases osas. Light amplification by stimulated emission of radiation Ruumiline koherentsus: laserkiir saab olla väga väikese läbimõõduga väikese hajuvusega Ajaline koherentsus: suhteliselt pikk koherentsuse teepikkus (~30 cm) Laserite liigid Gaaslaser- omane kiirguse suur monokromaatilisus ja lainepikkuse stabiilsus Dielektriklaser ehk tahkislaser- keskne komponent on kristall või klaas, mida on ioonidega rikastatud, et keskkonnas oleks vajalikud energiatasemed
Laser Mirell Lattik ja Simona Sulbi Kanepi 2010 · Light (valgus) · Amplification (võimendus) · Stimulated (stimuleeritud) · Emission (levitamine) · Radiation (kiirgus) Mis, Kuidas, Milleks ??? · Laser on (stimuleeritud kiirgusel põhinev) tehisvalgusallikas, mis eristub teistest valgusallikatest, tavavalgustitest sellepoolest, et kiirgab kitsaid (suunatud) valguskimpe, mis on koherentsed, monokromaatsed ja võivad olla ülieredad. · Laseri tööpõhimõte seisneb pöördhõive tekitamises optilisse resonaatorisse paigutatud aines. · Objektide mõjutamine laserikiirgusega: intensiivne, koondatud laserikiir võib
The effects mobile phones have on our lives Martin Põldvee 12a It is clearly that mobile phones have become an irreplaceable part of our lives. We use it to communicate with others, arrange our business or just for entertainment. As the mobile phones have simplyfied our lives in various ways, it also brings many disadvantages. To begin with, many researches have shown that mobile phone radiation may be harmful to human health. If mobile phones are used too frequently it may slightly damage your brain or reduce men's potential in getting siblings. It is also belieaved that mobile phones may cause some sleeping problems. Another, more usual problem what comes with cellphones is that they are expensive to use and when the battery is dead, it is completely useless. Also if parents trust their children to use mobile phones at very young age, the may get
industrial pollutants, including petroleum products, which have also contaminated the nation's soil. Some rivers and lakes within the country have been found to contain toxic sediments in excess of 10 times the accepted level for safety. The nation's land pollution problems are aggravated by the 15 million tons of pollutants that are added yearly to the existing 250 million tons of pollutants. In 1994, 24,000 acres of the country's total land area were affected. Radiation levels from the nuclear accident at Chernobyl exceed currently accepted safety levels. To sum up, environmental problems should be handled by local and international authorities also. Every single person should take care of environment and moreover we have to bring up our children to be conscious citizens of a clean and preserved planet.
AST R O NA U T C.K 2018 ASTRONAUT · SALARY: $5400-8300 ($65,140 - $100,701 PER YEAR) · BENEFITS: PERFECT VIEW, GOOD SALARY · ENVIRONMENT: SPACE STATION · COLLEAGUES: OTHER ASTRONAUTS AND SCIENTISTS · PERKS: STRESS, FAR FROM HOME · PROFESSIONAL HAZARDS: RADIATION, BONE AND MUSCLE DETERIORATION, DEATH CHARACTERISTICS · RESILIENCY · ADAPTABILITY · CURIOSITY · ABILITY TO TRUST · CREATIVITY / RESOURCEFULNESS CRITERIA NASA EUROPEAN SPACE CENTER · 26 AND 46 YEARS OLD · 27 AND 37 YEARS OLD · 157 - 191 CM · 153 190 CM · MILITARY WATER SURVIVAL TRAINING BOTH · Speak English (and russian)
The bombing of Hiroshima L Ä ÄNEMA A ÜHISGÜMNA ASIUM RASMUS SALUÄ ÄR 06.08.1945 · Hiroshima was the primary target of the US on august 6, 1945 · Enola Gay, Artiste and Necessary Evil Why did the americans attack Japan? The attack on Pearl Harbour Hawaii · 4 battleships sunk · 4 battleships damaged · 2 other ships sunk · 3 cruisers damaged · 3 destroyers damaged · 3 other ships damaged · 188 aircrafts destroyed · 159 aircrafts damaged · 2,335 killed · 1,143 wounded Aftermath · Total destruction of Hiroshima · 70 000 killed instantly · Another 70 000 dead by the end of 1945 Little Boy The codename for the atomic bomb · Weight - 4,400 kg · Length - 3.0 m · Diameter - 71 cm · Blast yield - 15 kilotons Interesting facts · The Flame of Peace in Hiroshima · Tsutomu Yamaguchi · The clo...
Many environment problems are caused by human actions. 1. Air pollution. Use public transportation instead of your own when going to work. Air pollution is also drastically reduced by conserving energy. It is the little things, like switching off fans and lights when you are not at home. Electricity causes the burning of large amounts of fossil fuels, which in turn pollute the air. Solar power is a fantastic solution. Now that solar radiation is at a climactic peak, we can reap power from the sun using solar panel systems. These range from home systems to larger scale systems powering entire communities and cities. 2. Deforestation. While individuals can rarely have a personal impact on the deforestation rate, there are other things you can do. Discourage deforestation and thus environmental degradation by reusing plastic and paper bags and packaging. Support eco-friendly
near by. Cars and factories blow poisoned gas in the air and it mixes with the oxygen, so the air that we breathe, becomes dangerous to our health. The ozone layer around the Earth, there is a special type of oxygen called ,,ozone". Ozone is important because it stops ultraviolett radiation from the sun. Many aerosol sprays and factories destroy ozone and they have made a very big hole in the ozone layer. This means that too much ultraviolet radiation now enters the Earth. This is very dangerous because it can cause cancer. Poisonous chemicals also cause acid rain, that destroyes plants, rivers, lakes and buildings. Acid rain can travel thousands of miles, so pollution in one country can become acid rain for another country. So how to avoid the worst? Lets talk about cars, which are the main means of transport in our everyday life, they are useful and take us to the place, where we want to go. But lets be
Metastabiilsus-pikaaeline tase(kahvatu kiirgus)kvantsiirde jooksul-võngub elektron aatomis erinevate leiulainete vahel.ergastatud kvantseisund püsib -10astmes-9....10astmel- 8sek.,metastab -10astmel-3s luminestsents-*külm helendus *tahkiste,vedelike,või gaaside mittesoojuslik helendus ultravalguse,elektronkimbu,keemilise reaktsiooni vms toimel*luminofoorid- luminestsentsvalgust kiirgavad ained(nt:org.värvained,väixeid lisandihulki sisaldavad anorg.ained) *kristallfosfoorid-väikesed lisandihulki sisald.ained (ZnS,Cu) *luminests.footonid tekivad siiretel lisandiaatomis või ioonis *kristallfosfoorid katavad luminests.lampide,teleri,arvutikuvari ekraanide sisepinda !!!!1.kui footon energiaga hf=Ek-Em tabab aatomit ergastustasemel Ek stimuleerib ta aatomit kiirgama.stimuleeritav ja kiiratud footon on omavahel koherentsed(teineteise koopiad) !!! 2.Kiirguslikud siirded (aatomi vm kvantsüst.energiatasemete vahel):1.footoni neeldumine2.vaba ehk...
Firstly, buying a good mobile phone which has internet access, GPS and other useful applications is quite expensive. Secondly, mobile phones have made people lazy. Hardly no-one goes to knock on a door to ask a friend out. Instead they call or send a text message. And of course there are video call, so people don't even have to meet face to face. Most important downside is health hazards. Mobile phones will affect one's hearing. Also it is proven that mobile phones have bad radiation and they may cause cancer. It can be said that mobile phones are useful and make people's life easier. But I think the problems that mobile phones may cause are too serious to avoid and it is healthier to use mobile phones only in a emergency.
There are different types of nuclear waste.Low-level waste,intermediate-level waste and high-level waste.Radioactivity diminishes over time.Low-level waste is stored in sealed facilities for hours,days or weeks,but high-level waste stays isolated for thousands of years,it is buried deep underground. Radioactive waste comes from different sources as used nuclear fuel and from nuclear weaponry.If contracted, it will cause radiation sickness. http://en.wikipedia.org/wiki/Acute_radiation_syndrome Radioactive waste is also planned to be disposed into outer space.This process contains launching multiple rockets,because one rocket could not carry much waste. If an incident would happen to the spacecraft,lots of debris would be scattered in our atmosphere. Nuclear weaponry is also a source of the radioactive waste.It causes a lot of radioactive waste.The nuclear bombs dropped on Hiroshima and Nagasaki resulted in
The most needed jobs in the 21st century Our world is growing bigger every day. Different kinds of people have different needs. There are some people who lead them on the right way to do something right. There's a need of a disaster and emergency management consultants, a leisure consultants and a global mobility specialists. What jobs they actually are? The main task of a disaster and emergency management consultant is writing exercises about chemicals, radiation, plane crashes, and terrorism. Companies order a consultant to their offices and then consultants make them clear about it. How to react in different situations, what to do with toxic substances etc. It's a bit like creating a film. Of course disaster and emergency management consultants can fly around the world lot. More free time and greater leisure options at home and out are responsible in part for the growing importance of that job. The need for independent and objective
Aatomi planetaarmudel: aatom koosneb pos laetud tuumast, millesse on koondunud peaaegu kogu aatomi mass ja tuuma elektrostaatilises väljas tiirlevatest elektronidest. Bohri 1.postulaat: aatom võib olla vaid kindlates (stat) olekutes, millest igaühele vastab energia En. Stat olekus aatom ei kiirga. Bohri 2: aatomi üleminekul stat olekust energiaga Em olekusse enegriaga Ek kiiratakse või neelatakse energiakvant hf, mis võrdub nende olekute energiate vahega hf=Em-Ek. Aatomispektrite unikaalsus: erinevate statsionaarsete olekute tõttu on iga keemilise elemendi aatomispektri kiirjus- ja neeldumisjoonte kogumik kordumatu. Aatomi põhiolek: väikseima võimaliku energiaga olek. Aatomi ergastatud olek: olek, mille energia on suurem kui aatomi põhioleku. Stat olek: olek, milles aatom ei kiirga.Energiatase: aatomi stat olekule vastav energia. De Broglie laine: mikroosakeste olekut iseloomustav laine. DB lainepikkust ja osakeste impulssi mv seob vale...
call for help. In addition mobile phones can be used for several tasks. For instance, if we want something to be captured we can use our mobile phones. They are equipped with a camera in consequence we can take pictures and videos and later watch them on our computer. As a result mobile phones are a way of entertainment. On the other hand mobile phones have their disadvantages. Moreover it was proved that mobile phones are harmful to our health. Mobile phones send out electromagnetic radiation. For example that can have effect on our brain and heart. It is not recommended to wear mobile phones in your breast pocket or having phone close to your head. Thus it is recommended to use hands-free. Secondly, people can get addicted to mobile phones. For instance they can´t put an end to their calls and the result will be a drastic bills. All things considered, it seems to me that mobile phones improve our comfortable life but only then when people using phones reasonable
Laser Kortsude silumine Mis on laser? Laser (Light Amplification by Stimulated Emission of Radiation) valguse võimendumine stimuleeritud kiirguse kaudu · on seade, mis võimaldab kiirata kitsaid, koherentseid ja monokromaatilisi valguskimpe. Tööpõhimõte · seisneb pöördhõive tekitamises optilisse resonaatorisse paigutatud aines · Laseri abil saadakse stimuleeritud kiirgus · Laserkiire omadused: monokromaatilisus, koherentsus, vähene hajuvus, suur võimsus Kortsude silumine · Toimib Cu-laseri kaudu- vaskaurude laser, mis kiirgab kindla lainepikkusega kollaseid (lainepikkusega 578,2 nanomeetrit) ja rohelisi kiiri (510,6 nm) · Nimelt laseb pealmine nahakude kiirgust läbi, alumised nahakihid aga tõmbuvad selle mõjul kokku ning kortsude hulk väheneb ja need muutuvad madalamaks. · Vaskaurudel saadi laserefekt juba 1965.a-l Tööpõhimõte · gaaslahendus täitegaasis, milleks...
Euroopas ning ka Eestis on kehtestatud piirmäärad töökoha ja elupaigas esinevate elektromagnetlainete kiirguse kohta. Praeguste uurimuste põhjal võib kokkuvõtvalt öelda, et elektromagnetlained, mida kiirgub elektriliinidest ning elektrit kasutavatest seadmetest on ohutu ega too kaasa tervise kahjustusi, kuid kuna esinevad kahtlused jätkatakse uuringuid lõplike tulemuste saamiseks. 6. Kasutatud allikad 1. Electromagnetic radiation and health http://en.wikipedia.org/wiki/Electromagnetic_radiation_and_health (11.03.2012) 2. Elektromagnetväli http://et.wikipedia.org/wiki/Elektromagnetv%C3%A4li (18.12.2011) 3. Infrared radiation http://en.wikipedia.org/wiki/Infrared_radiation (20.03,.2012) 4. Infrapunakiirgus http://et.wikipedia.org/wiki/Infrapunakiirgus (17.03.2012) 5. Ultraviolet radiation http://en.wikipedia.org/wiki/Ultraviolet_radiation (20.03.2012) 6. X-ray http://en.wikipedia
Unit 9: vocabulary 1. global warming (n) an increase in the earth's average temperature 2. flood (n) overflowing of water 3. hurricane (n) violent storm 4. cliff (n) a high steep face of a mountain 5. ozone layer (n) part of the atmosphere that limits the sun's incoming radiation levels 6. stream (n) small river 7. volcano (n) a mountain 8. in danger of extinction on the verge of dying out 9. earthquake (n) series of vibrations induced in the earth's crust 10. drought (n) a period of dry weather 11. wilderness (n) an area uninhabited by people 12. scenery (n) the general appearance of a place/landscape 13. peak (n) the pointed top of a mountain 14. summit (n) highest point of a mountain 15
Laser Laser ehk valguskvantgeneraator on valguse stimuleeritud kiirgumisel rajanev koherentvalguse generaator. Light Amplification (Amplifier) by Stimulated Emission of Radiation Valguse võimendus (võimendi) stimuleeritud kiirguse kaudu Laseri valgukimbu küljed on peaaegu paralleelsed ja valgus ei haju peaaegu üldse. Ülieredad ja kitsad valguskimbud. Esimene laseri nime kandev optiline seade -1960.a T.H.Maiman. Rubiinilaser silma võrkkesta ravimine Aktiivlaine liigist olenevalt kasutatakse selleks elektrivoolu (gaasides, aurudes, pooljuhtides), elektromagnet-, harvemini korpusklaarkiiritust (tahkistes, vedelikes) või keemilistes(enamasti fotokeemilistes) reaktsioonides vadanevat energiat (gaasides). Mõningates laseritüüpides segatakse kiirgusainet abiainega, millelt ergastusenergia kandub kiirgusosakestele, tõhustades viimaste pöördhõivestumist. Valgusvõimendina rakendatakse laserit suhteliselt harva. Valdav enamik lase...
Tallinna Tehnikaülikool Anna Kattel Sündmust, millest kõik sai alguse – Suur Pauk Referaat Tallinn, 2014 Sisukord Sisukord......................................................................................................................................2 1. Sissejuhatus.............................................................................................................................3 2. Suur Pauk................................................................................................................................4 2.1. Suure Paugu nimi.............................................................................................................4 2.2. Kas see kõik tõesti ikka juhtus?.......................................................................................4 2.3. CMBR kiirgus (cosmic microwave backround radiation)...............................
Answers for the IPCC Summary. 1.Radiative forcing is a measure of the influence that a factor has in altering the balance of incoming and outgoing energy in the Earth-atmosphere system and is an index of the importance of the factor as a potential climate change mechanism. 2.The three main things that alter the energy balance of the climate system are the changes in the atmospheric abundance of greenhouse gases and aerosols, in solar radiation and in land surface properties. 3.The two sources for the increased concentration of CO2 in the atmosphere are production, distribution and consumption of fossil fuels and as a by-product from cement production. 4.The two main sources of methane pollution are agriculture and fossil fuel use. 5.Volcanic aerosols are not included to the list because of their episodic nature. 6.The world's oceans absorb more than 80% of heat. 7.The total 20th-century rise is estimated to be 0.17...
Ecology and Environment I Word formation Noun Verb Adjective Eruption Protection Pollution - Penetration Contamination Emission - Depletion - Prediction Reduction Consumption Campaign/campaigner Disaster - Radiation Destruction - II Give the opposite ... Renewable resources Use Protect Admissibly Predicted III Fill in the correct word 1. The polar bear's .......................... is the icy waste...
10.kl VOCABULARY OF UNIT 4 acid rain happevihm address aadress afar kaugele (nt maale) alternative alternatiiv, valikuvõimalus ant sipelgas armour soomus, raudrüü array rivi, rida ballad ballaad ban keelustama budget eelarve can´t help ei saa midagi parata can´t stand ei talu car pool auto ühiskasutus centipede sajajalgne circumference ümbermõõt clad kaetud, riietatud clover ristikhein coal kivisüsi community kogukond, ühiskond consequence tagajärg conservation looduskaitse crimson veripunane, tulipunane daisy tree karikakra puu deceive tüssama, petma, eksiteele viima deforestation metsa lageraie demand nõudma diameter diameeter drawback puudus, tagasilöök drift triivima, hulkuma emit eraldama, kiirgama endangered species ohustatud/hävimisohus liigid energy use energia kasutus epic eepiline, kangelaslik face vastu astuma, silmitsi olema fairy land muinasjutumaa fil...
Radioaktiivne kiirgus ja selle kasutamise võimalused Radioaktiivne kiirgus ● Tekib looduslikes tingimustes radioaktiivsete elementide ebastabiilsete tuumade lagunemisel ● Samuti kergete tuumade ühinemisel vesinikupommi lõhkemisel ja tähtede termotuumareaktsioonis Radioaktiivsuse liigid Alfakiirgus ● Koosneb kahest osakesest - kahest prootonist ja kahest neutronist koosnevatest heeliumi aatomituumadest ● Rasked, suure laenguga ja aeglased ● Varjendiks piisab paberilehest Radioaktiivsuse liigid Beetakiirgus ● Koosneb beetaosakestest - kas elektronist või positronist ● Läbimisvõime alfaosakestest suurem ● Teisese kiirgusena tekib ka röntgenkiirgus ● Varjestamiseks piisab õhukesest metall-lehest, näiteks alumiiniumilehest. Radioaktiivsuse liigid Gammakiirgus ● Koosneb suure energiaga gammakvantidest ● Inimesele ohtlikuim tänu suurele läbimisvõimele ● Kuna gammakvandil puudub elektrilaeng, siis nad elektromagnetväljas ei pi...
Laser Laser (Ligth Amplification by Stimulated Emission of Radiation - valguse võimendumine stimuleeritud kiirguse kaudu) on seade, mis võimaldab kiirgata kitsaid, koherentseid ja monokromaatilisi valguskimpe. Laseri abil saadakse stimuleeritud kiirgus. Laseri tööpõhimõte seisneb pöördhõive tekitamises optilisse resonaatorisse paigutatud aines. Laseri ehitus Laseri sünteetiline rubiinkristall töödeldakse silindriks, mille telje pikkus ületab tublisti läbimõõtu. Veel on oluline, et ta asetatakse teljega risti rihitud tasapatalleelsete peeglite
and also woods, groundwater, animals and so on, in other words it's everything that human hasn't created. These resources are also used in industry. We get natural resources from the environment. Many of them are essential for our survival while others are used for satisfying our wants. Renewable resources: Some natural resources can be reproduced within a few years or decades. These are called renewable resources. Solar radiation, wind and hydroelectricity, are perpetual resources that are in no danger of a lack of long-term availability. Some natural renewable resources such as geothermal power, fresh water, timber, and biomass must be carefully managed to avoid exceeding the worlds capability to displace them. Solar energy is the energy derived directly from the Sun. Along with nuclear energy, it is the most important source of energy on Earth. People usually use solar energy to produce
........ 4 Laseri kasutusvaldkonnad........................................................................................................... 5 Kasutatud materjalid................................................................................................................... 9 3 Mis on laser? Laser (Light Amplification by Stimulated Emission of Radiation valguse võimendumine stimuleeritud kiirguse kaudu) on seade, mis võimaldab kiirata kitsaid, koherentseid ja monokromaatilisi valguskimpe. Laseri abil saadakse stimuleeritud kiirgus. Laseri tööpõhimõte seisneb pöördhõive tekitamises optilisse resonaatorisse paigutatud aines. Laseri tüübid Lasereid jagatakse tööreziimi, ergasti ja kiirguri järgi. · alalislaserid · välklaserid (impulsslaser) o neodüümlaser · tahkislaser
1927) ehitas Fifth level esimese töötava laseri, milleks oli sünteetilisest rubiinist silinder. Rubiinist laser Lihtne rubiinlaseri ehitus Laserite ajalugu LASER on lühendsõna: Light Amplification by Stimulated Emission of Radiation (valguse võimendamine stimuleeritud kiirguse abil) Roy Glauber, 80, John Hall, 71, Theodor Hänsch, 63, USA Harvardi Ülik. USA Colorado Saksamaa, Müncheni professor Ülik. professor Ülik. professor 2005. A. Nobeli füüsikalaureaadid Üldse on laseritega seotud tööde eest määratud 16 Nobeli füüsikaauhinda (incl. 2005) 8
It's the national talking point, and most people watch at least one daily bulletin. It can be mortifying for a weather man or woman who has predicted rain for the morning to wake up to brilliant sunshine. These days, a weather forecaster’s job is even more complicated because they are relied upon to predict other environmental conditions. For example, in the summer the weather forecast has to include the pollen count for hayfever sufferers. Some also include reports on ultraviolet radiation intensity to help people avoid sunburn. The job of a weather forecaster is certainly far more complicated than just pointing at a map and describing weather conditions. It's a job for professionals who can cope with stressful and demanding conditions.
Koherentvalguse generaator rajaneb valguse stimuleeritud kiirgusel. Valguse all mõistetakse sel juhul lühilainelist elektromagnetkiirgust (lainepikkus 1mm). Lühidalt laserite ajaloost Aastal 1917 mainis Albert Einstein esimesena looduses esinevat stimuleeritud emissiooni protsessi, mis viitas juba siis palju aastaid hiljem leiutatud laserite tööpõhimõtetele. Veel enne laserit leiutati aga maser (microwawe amplification by stimulated emission of radiation ehk ,,mikrolainete võimendus kiirgusest stimuleeritud eritumise kaudu") aastal 1954. Maseri leiutamise au kuulub Charles Townesile ja Arthur Schawlowile. Maserit kasutati raadiosignaali võimendamiseks. 1960. aastal leiutas ameeriklane Theodore Maiman rubiinlaseri, milles esimest korda realiseeriti pööratud jaotuse põhimõte. Rubiinlaserit kasutati esimest korda 1964 silma võrkkesta ravimisel. Mitmete allikate põhjal peetakse seda esimeseks optiliseks- ehk valguslaseriks. Samas
Prof. Stephen Hawkings Stephen William Hawking was born on 8 January 1942 (300 years after the death of Galileo) in Oxford, England. His parents' house was in north London, but during the second world war, Oxford was considered a safer place to have babies. When he was eight, his family moved to St. Albans, a town about 20 miles north of London. At the age of eleven, Stephen went to St. Albans School and then on to University College, Oxford; his father's old college. Stephen wanted to study Mathematics, although his father would have preferred medicine. Mathematics was not available at University College, so he pursued Physics instead. ...
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