David Walland

Seneste kommentarer

Radioactive waste

For 220 dage siden: Hospital wastes are different in several ways to most industrial ones in particular because they contain a good deal of radioactive materials - well diluted but present. There needs to be consid...

Lots of experience!

For 268 dage siden: It's sad but we here in the UK have built so many of these buildings that there is a great fund of experience here in blowing them (up or) down. The names appear just to be the local names of th...

Just Ships?

For 276 dage siden: I wonder how such a device would alter the sideways pressure on the object being cloaked/protected by it. Clearly if the amount of turbulence created by for example aircraft wings can be reduced...

I wonder why Journalists get it wrong?

For 284 dage siden: Having read (if that's an appropriate word, as some seem to be meaningless) the comments, it's no surprise that Journalists don't understand these issues. Clearly engineers don't (well Danish ones...

Two words

For 284 dage siden: Hawthorn Effect?

Illuminating the staircase

For 345 dage siden: Can I suggest that you buy an LED bulb in place of the incandescent one. These last for very long times and can be bought (expensively) in fairly high outputs now (there are plenty on EBay - at le...

Vague? Well yes, necessarily.

For 345 dage siden: As stated in some of the comments, the effect of these poisons are very personal. Also I imagine different variaties of potatoes grow different levels of solanine etc. under the same conditions. ...

Do I hear someone agreeing with me?

For 346 dage siden: I have certainly written in letters to Ingenioeren in the past pointing out the importance of looking at the full energy cost of such things as electric vehicles *before* claiming them to be enviro...

We're not *totally* stupid over here

For 346 dage siden: Believe it or not, most people actually realise that the wind doesn't blow all the time, so we recognise that wind turbines are only *PART* (shouting deliberate) of the answer to renewable energy. ...

Does battery life suffer?

For 409 dage siden: I had the impression that using fast recharging has a seriously deleterious effect on the battery life. Since batteries are so expensive that would be a very considerable negative cost to be added...