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David Walland

David Walland

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Dizzy spells

I've just been reading one of my old Analog magzines from the 1960s, where this very issue is being discussed in the obligatory science fact article. There are two serious problems with the human balance mechanism which mean that: the rotation rate must be quite low. Humans are very sens...

15. okt 2009 12:22Hvorfor har man ikke et roterende modul på den internationale rumstation?

The big problems with this discussion

Two major issues: The critical with energy production forms is that they in the end, when all the energy costs and all the energy generated have been added and subtracted should give a plus on the calculation. To the best of my understanding, Wind Energy calculated in this way produces somethin...

15. okt 2009 11:33Radioaktivt affald ligger gemt i containere i Sibirien

Radon measurement

One of the problems with radon measurement is not how much there is at particular points in a building but how much each person inhales. By reducing draughts and the mixing of air in the building, some parts of the building tend to have higher levels than others. In particular cellars are likely ...

9. okt 2009 11:20Leder: Radon - den accepterede dræber i vores boliger

World Wide

At last someone has spotted that this is a world-wide issue. What a pity the politicians won't! My country - the UK - is patting itself on the back for reducing its carbon footprint: by exporting production to China and India and other similar places! There's nothing like a good sound...

9. okt 2009 11:01Norge vil være CO2-neutral i 2030

If it can't be found in flat old Denmark...

What chance is there of ever seeing one again in Afganistan. It has several bits higher than Himmelbjerget :-) I imagine any of the "friends of the Taliban" who are following this debate would be quaking in their shoes with fear - if they could stop laughing long enough.

2. okt 2009 15:29Spionfly forsvandt for Forsvaret under øvelse

Re: Re: Re: "Spare"pærer er intet andet end E27 lysstofrør

[quote]Hvafforenfisk? Mine 'længstholdende' sparepærer har nu holdt i 5+ år. Brændende fra skumring til 'sengetid'! Ditto! Vi har temmelig mange elsparepærer rangerende fra 3W til 23W, indendøre såvel som udenfor. Vi skifter så at sige aldrig en pære ud fordi den springer,...

24. sep 2009 12:35Skal kraftværkerne investere i fasekompensatorer, når vi skifter til sparepærer?

Re: Re: Ansvarsbevidsthed søges!

[quote]Forlang der bliver udviklet halogenpærer med indbygget hvid belægning, så det skærende lys forsvinder. Hvorfor udvikle på noget vi er på nippet til at forbyde, halogen bruger stadig 70% af det en glødepærer bruger. Vi skal under 20% før det er acceptabelt, nogle annoncer for LED lampe...

17. sep 2009 13:16Åbent skænderi om ansvaret for afbrændte sparepærer

Which Physics did you learn?

"En asteroide der stort set kun består af is, vil være brændt helt væk inden den når jordens overflade, nok næsten uanset hvor stor den er. Is og tusindvis af graders varme, er ikke særligt gode venner" Water ice has an extremely high heat of fusion. The result of a significant dirty snowball pa...

20. aug 2009 15:54Nasa planlægger at sende astronauter til asteroider

Environmental issue are *complicated*

It's been fascinating to read the article and all of the comments. What does shine through is the sheer complexity of even a fairly straightforward environmental issue, and the number of people in the debate who seem to work in "sound bites". In my years as a Radiation Protection Adviser i...

14. aug 2009 13:59Haldor Topsøe: Nu skal vi fremstille benzin af træ

It brings back memories

I vividly remember driving regularly Bording - Vejle and back in 1991. None of the motoways in this discussion were present or relevant and I had the chance to see many interesting sights (like farmers spreading muck -gylle- on the snowy fields in mid-winter in spite of all the laws against this...

6. aug 2009 11:24Skandaløst med de nye motorveje i Jylland