Bloggfrslur mnaarins, oktber 2009

Mling verkfristofunnar VERKS: LJSGI-LFSGI 13. oktber. Meal fyrirlesara er rgjafi NASA...

ljosgae_i-lifsgae_i--verk_s---b.jpg

Ftt er mikilvgara skammdegnu en g lsing. Ftt hefur eins mikil hrif lifsgi okkar og vellan egar birtu slar ntur ekki. ess vegna hltur a vera mikill fengur af mlingi um ljsgi og lfsgi ar sem valinkunnir erlendir fyrirlesarar fjalla um etta mikilvga ml.

Mling um sjlfbrni og lsingarhnnun, 13. oktber 2009

LJSGI LFSGI

ljsi breyttra astna mannvirkjager hr slandi eru tkifri til endurmats og uppbyggingar fyrir nja tma og njar stefnur. Raunhft er a tla a herslur framtinni veri hnnun til sjlfbrni og ar me tali vi hnnun lsingar ar sem krfur um orkusparna og vellan eirra einstaklinga sem innan bygginganna dveljast hafa aukist.

Rgjafarfyrirtki Verks mun standa fyrir opnu mlingi sem ber heiti „LJSGI - LFSGI" rijudaginn 13.oktber nstkomandi Laugardalshll - rstefnusal 3. ar munu aljlegir fyrirlesarar mila njum rannsknum og eim mguleikum sem vi hfum til a bta umhverfi okkar og vellan me birtu.

Fyrirlesarar mlingsins eru:

Dr. George Brainard taugalknir og srstakur rgjafi NASA - National Space Biomedical Research Institute vi run mtvgisagerum vi heilsufarsbreytingum geimfara

Dr. Merete Madsen dagsbirtu-arkitekt

Kevan Shaw lsingarhnnuur og formaur nefndar um sjlfbrni PLDA - Aljlegum samtkum lsingarhnnua

Martin Lupton fr Guerrilla Lighting og formaur PLDA - Professional Lighting Design Association

Mlingi er haldi ensku og er tla llum eim sem vilja frast um gildi lsingar og eiga tt a bta umhverfi sitt og annarra

Miar fast www.midi.is

Nnari upplsingar um mlingi eru slinni: http://www.verkis.is/malthing en einnig hj rdsi Harardttur trh(hj)verkis.is, Gujni L. Sigurssyni gls(hj)verkis.is og Rsu Dgg orsteinsdttur rdt(hj)verkis.is.

>> Dagskr / Programme

>> Fyrirlesarar / Bios

>> Frttatikynning

>> Press release

>> www.verkis.is

>> www.midi.is

sitelogo.png
Verkfristofa slands

Samfelld reynsla fr rinu 1932

Verkfristofan VERKS sem heldur mlingi rtur a rekja til fimm verkfristofa me 255 ra samanlagan starfsaldur, en r sameinuust ri 2008. Starfsmenn eru um 300:

1932: VST - Verkfristofa Sigurar Thoroddsen
1961: RT - Rafagnatkni
1962: Fjarhitun
1965: Rafteikning
1970: Fjlhnnun

www.verkis.is


sldin sem var nsta leyti fyrir rem ratugum, en kom ekki. Vde....

Fyrir feinum ratugum, .e. hafsrunum svoklluu, vruu margir vi v a raunveruleg sld vri nsta leyti. Aeins feinir ratugir vru til stefnu. Allt gti fari versta veg. Miklar loftslagsbreytingar vndum... Crying

myndbndunum hr fyrir nean eru vitl vi vsindamenn sem fjalla um essa yfirvofandi httu. Tala er um jkla sem voru a ganga fram, venju hara vetur, aukinn hafs, ofl. essi hugaveru myndbnd eru fr v um 1978. Skyndilega fr a hlna aftur, jklar fru a hopa aftur, og breyttust vihorfin verulega eins og allir vita....

skp erum vi fljt a gleyma... Smile

Skyldi einhvern tman fara a klna aftur eins og hafsrunum, jklar ganga fram, harir vetur, aukinn hafs...? Hummm... Halo

(Einhverjar truflanir hafa veri dag hj YouTube. Kemst vonandi lag innan skamms).

Kafli 1

Kafli 2:

Kafli 3:


Nr frbr ttar Sjnvarpinu...

ari_trausti_917419.pngEin besta slenska ttar allra tma, Nskpun-slensk vsindi, er a hefja gngur snar Sjnvarpinu um essar mundir. Umsjnarmaur er Ari Trausti Gumundsson jarvsindmaur og rithfundur.

fyrsta ttinum, sem var sndur fimmtudaginn 1. oktber, var sagt fr hvernig nota m sj og jkulvatn til ess a framleia raforku, fr rannsknum v hva gerir slendinga a einni hamingjusmustu j veraldar samkvmt knnunum, og hvernig fatlaur slenskur vsindamaur tekur tt verkefni sem miar a v a hann ni betra valdi yfir fingrum snum me v a nota rafstraum.

etta er r tlf tta um vsindi og fri slandi. Hver ttur er tpar 30 mn. a lengd og inniheldur rj lk vifangsefni. annig kynnast horfendur llum aldri 36 hugaverum verkefnum r flestum geirum vsinda og tkni en eim efnum er mikil grska, eins og segir vef RV.

ttirnir eru unnir fyrir Sjnvarpi samvinnu vi margar vsindastofnanir, hskla, flg og rannsknarsji.

Enginn m missa af essum ttum Sjnvarpsins og Ara Trausta!

Bloggarinn, sem horfir lti sjnvarp, missti a mestu af fyrsta ttinum. Sem betur fer reyndist hgt a sj hann vef RV me v a smella hr.


008182-0002
008182-0001Nstu ttir:

2. ttur.

Snt: fimmtudagur 8. okt. 2009 kl. 21.25.
Endursnt: 9. oktber 2009 kl. 18.25; 10. oktber 2009 kl. 10.20

rum tti er fjalla um hugsanlegan tt slendinga vruflutningum yfir norurskautshafsvi, um rannsknir virkni og hrifum veiarfra sj og um rangur brttunni gegn sku krabbameini og njar uppgtvanir um orsakir ess.

3. ttur.

Snt: fimmtudagur 15. okt. 2009 kl. 21.25.
Endursnt: 16. oktber 2009 kl. 18.25; 17. oktber 2009 kl. 10.25

rija tti er fari saumana oluleit noraustur af slandi, fjalla um fyrirtki sem hefur n miklum rangri tlvuheimi skla og sklastarfs og um hverarverur sem geta astoa slendinga orkumlum.


Geimgeislar hafa aukist verulega undanfari. Boar a klnandi veurfar samkvmt kenningu Svensmarks...?


Fyrir feinum dgum birti NASA frtt um a styrkur geimgeisla s n 19% meiri en nokkurn tman hefur mlst 50 r. stan er hin mikla lg virkni slar sem flestir hafa vntanlega heyrt um. "We’re experiencing the deepest solar minimum in nearly a century,” sagi Dean Pesnell hj Goddard Space Flight Center, “so it is no surprise that cosmic rays are at record levels for the Space Age.”

Frtt NASA m lesa hr fyrir nean.

a er ljst a nttran er a framkvma mikla tilraun. Mun kenning Henriks Svensmarks reynast rtt? Mun a reynast or a snnu egar hann sagi um daginn: "Vi anbefaler vores venner at nyde den globale opvarmning, mens den varer".

Bloggarinn vonar a Svensmark hafi rangt fyrir sr og klnun s ekki vntanleg nstu rum. Vonandi reynist ekki hgt a kenna nttruflunum um meirihluta eirrar hkkunar hitastigi sem vi upplifum sustu ld. Vonandi gengur s hkkun ekki til baka.


Alls ekki meiri kulda takk!
Pinch

cosmicraysvsclouds_917133.jpg


Einhver fylgni virist vera milli styrks geimgeisla og lofthita samkvmt mlingum fr loftbelgjum, eins og fram kemur essari mynd. Eigil Friis-Christensen er yfirmaur Dnsku geimrannsknarstofnunarinnar .

Niurstaa essarar tilraunar nttrunnar birtist innan frra ra skrifu skin Wink

--- --- ---



Cosmic Rays Hit Space Age High
09.28.09

Energetic iron nuclei counted by the Cosmic Ray Isotope Spectrometer on NASA's Advanced Composition Explorer (ACE) spacecraft reveal that cosmic ray levels have jumped 19% above the previous Space Age high. Credit: Richard Mewaldt/Caltech
› Larger image

An artist's concept of the heliosphere

An artist's concept of the heliosphere, a magnetic bubble that partially protects the solar system from cosmic rays. Credit: Walt Feimer/NASA GSFC's Conceptual Image Lab
› Larger image

Planning a trip to Mars? Take plenty of shielding. According to sensors on NASA's ACE (Advanced Composition Explorer) spacecraft, galactic cosmic rays have just hit a Space Age high.

"In 2009, cosmic ray intensities have increased 19% beyond anything we've seen in the past 50 years," says Richard Mewaldt of Caltech. "The increase is significant, and it could mean we need to re-think how much radiation shielding astronauts take with them on deep-space missions."

The cause of the surge is solar minimum, a deep lull in solar activity that began around 2007 and continues today. Researchers have long known that cosmic rays go up when solar activity goes down. Right now solar activity is as weak as it has been in modern times, setting the stage for what Mewaldt calls "a perfect storm of cosmic rays."

"We're experiencing the deepest solar minimum in nearly a century," says Dean Pesnell of the Goddard Space Flight Center, "so it is no surprise that cosmic rays are at record levels for the Space Age."

Galactic cosmic rays come from outside the solar system. They are subatomic particles--mainly protons but also some heavy nuclei--accelerated to almost light speed by distant supernova explosions. Cosmic rays cause "air showers" of secondary particles when they hit Earth's atmosphere; they pose a health hazard to astronauts; and a single cosmic ray can disable a satellite if it hits an unlucky integrated circuit.

The sun's magnetic field is our first line of defense against these highly-charged, energetic particles. The entire solar system from Mercury to Pluto and beyond is surrounded by a bubble of solar magnetism called "the heliosphere." It springs from the sun's inner magnetic dynamo and is inflated to gargantuan proportions by the solar wind. When a cosmic ray tries to enter the solar system, it must fight through the heliosphere's outer layers; and if it makes it inside, there is a thicket of magnetic fields waiting to scatter and deflect the intruder.

"At times of low solar activity, this natural shielding is weakened, and more cosmic rays are able to reach the inner solar system," explains Pesnell.

Mewaldt lists three aspects of the current solar minimum that are combining to create the perfect storm:

  1. The sun's magnetic field is weak. "There has been a sharp decline in the sun's interplanetary magnetic field (IMF) down to only 4 nanoTesla (nT) from typical values of 6 to 8 nT," he says. "This record-low IMF undoubtedly contributes to the record-high cosmic ray fluxes."

  2. Graphical 3D representation of the heliospheric current sheet

    The heliospheric current sheet is shaped like a ballerina's skirt. Credit: J. R. Jokipii, University of Arizona
    › Larger image


  3. The solar wind is flagging. "Measurements by the Ulysses spacecraft show that solar wind pressure is at a 50-year low," he continues, "so the magnetic bubble that protects the solar system is not being inflated as much as usual." A smaller bubble gives cosmic rays a shorter-shot into the solar system. Once a cosmic ray enters the solar system, it must "swim upstream" against the solar wind. Solar wind speeds have dropped to very low levels in 2008 and 2009, making it easier than usual for a cosmic ray to proceed.

  4. The current sheet is flattening. Imagine the sun wearing a ballerina's skirt as wide as the entire solar system with an electrical current flowing along the wavy folds. That is the "heliospheric current sheet," a vast transition zone where the polarity of the sun's magnetic field changes from plus (north) to minus (south). The current sheet is important because cosmic rays tend to be guided by its folds. Lately, the current sheet has been flattening itself out, allowing cosmic rays more direct access to the inner solar system.

"If the flattening continues as it has in previous solar minima, we could see cosmic ray fluxes jump all the way to 30% above previous Space Age highs," predicts Mewaldt.

Earth is in no great peril from the extra cosmic rays. The planet's atmosphere and magnetic field combine to form a formidable shield against space radiation, protecting humans on the surface. Indeed, we've weathered storms much worse than this. Hundreds of years ago, cosmic ray fluxes were at least 200% higher than they are now. Researchers know this because when cosmic rays hit the atmosphere, they produce an isotope of beryllium, 10Be, which is preserved in polar ice. By examining ice cores, it is possible to estimate cosmic ray fluxes more than a thousand years into the past. Even with the recent surge, cosmic rays today are much weaker than they have been at times in the past millennium.

"The space era has so far experienced a time of relatively low cosmic ray activity," says Mewaldt. "We may now be returning to levels typical of past centuries."

NASA spacecraft will continue to monitor the situation as solar minimum unfolds. Stay tuned for updates.
Dr. Tony Phillips
Heliophysics News Team

tarefni:

Cosmic rays and climate.
Jasper Kirkby / CERN
CERN Colloquium, 4 June 2009

Mjg frlegt!


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Ágúst H Bjarnason
Ágúst H Bjarnason

Verkfr. hjá Verkís.
agbjarn-hjá-gmail.com

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