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Ask Slashdot: the State of Free Video Editing Tools?

yope Re: What about Lightworks? (163 comments)

Unfortunately you'd probably find more options if you decided to switch to Linux. Cinelerra comes to mind, or Kdenlive. Cinelerra is very powerful, but needs a lot to get used to and learn to avoid its bugs. IMHO, in the end it's well worth the effort, because it has some really nifty features. If a steep learning curve is not your thing, stay with Kdenlive.

about 2 months ago
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Electrical Engineer Unemployment Soars; Software Developers' Rate Drops to 2.2%

yope Re:One cause (419 comments)

You are mixing two different things: I did not say kids in general where getting dumber. I only said that electrical engineers graduating from college and universities nowadays are of much worse (professional) quality than, say 10 or 15 years ago. This also is not the typical sort of cliche-rant that every adult seems to have against kids of newer generations. There really is a measurable and substantial difference. We receive interns regularly at my job, and all of my colleagues agree with this fact: basic electric (electronic-) engineering skills have declined dramatically.

about a year and a half ago
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Electrical Engineer Unemployment Soars; Software Developers' Rate Drops to 2.2%

yope Re:One cause (419 comments)

I get your point, but trust me: I am comparing things that I (and some of my class-mates) did while still at the university with the capabilities of students that finish college or university today. There is a BIG difference, and most of my current colleagues agree with me. We have interns here regularly, so we can keep track of their accomplishments easily.

about a year and a half ago
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Electrical Engineer Unemployment Soars; Software Developers' Rate Drops to 2.2%

yope Re:One cause (419 comments)

I am an electrical engineer, and work in Europe. What I see here, is that the quality of engineers coming out of college or universities is declining at an alarming rate. The knowledge-level about basic subjects is embarrassing to say the least. If this trend is comparable in the US, I can fully understand why US companies prefer to look elsewhere for good engineers. The decline in quality here seems due to the lack of students really interested in electrical engineering and "complicated" studies becoming less popular. Colleges and universities here need to lower the level of "difficulty" to make the curriculum more attractive and gain more students. The result is catastrophic.

about a year and a half ago
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How many microprocessors are in your home, total?

yope Re:I counted almost 30 with no "computers" (559 comments)

You might be surprised here, about how things have changed. If these devices are less than 6...8 years old, chances get pretty low, there isn't a microcontroller involved. Making a hardwired design is simply much to expensive compared to how cheap and energy-efficient simple microcontrollers are these days. That is true even for very high volume mass market products. As for wrist-watches, I think it still depends on how complex it is. The simple ones probably still use something simpler than a microcontroller, purely because of energy efficiency.

more than 3 years ago
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Big Dipper "Star" Actually a Sextuplet System

yope Actually a quadruple... (88 comments)

2*2=4, so that would be a quadruple, I guess.

more than 4 years ago
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Lifecycle Energy Costs of LED, CFL Bulbs Calculated

yope Re:Another things to consider (400 comments)

Well, this is exactly what I have always been saying. Many previous studies tend to ignore the effect of heat generated by incandescents on your heating bill. In contrast, this study does mention this effect (simple thermodinamics as you correctly state it), but I don't believe their figures.
Their study says that assuming 75% of the total time the incandescent light bulb is used, is during periods where central heating is also used, and that central heating is fuled by natural gas, the total amount of CO2 emissions saved on your GAS (heating) bill will only by about 17 kg over the whole 25000 years.
I think their math doesn't add up, since it should not be too much lower than just 75% of the CO2 emissions of the electrical energy used to light the bulb (again, relatively simple thermodynamics). Searching on the internet a little, one finds that 1 kWh of heat from natural gas produces roughly 200gr of CO2. Considering all the energy going into an incandescent bulb is converted into heat (that little fraction that is emitted as light eventually also generates heat - simple thermodynamics), that means that this 40Watt light bulb is generating 25000*0.04*0.75 = 750 kWh of heat over its 25000 hour life-span (well, in the study that's actually 25 light bulbs at 1000h each).
That yields approximately 150kg of CO2 saved by the bulb(s)... sounds much more like it.

And this result is without considering the fact that central heating also has losses (through exhaust, ventilation, etc... which yields less than 100% efficiency), so saved emissions should be even higher!

more than 4 years ago
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Lifecycle Energy Costs of LED, CFL Bulbs Calculated

yope Re:Another things to consider (400 comments)

They actually briefly mention this point in the study, so it is at least being considered (RTFA).
Although I do not entirely agree with some assumptions made and the last calculation about heat.
You also forget to mention the opposite possibility: excess heat being benefical in colder places. The study mentions an example where they dismiss the heating effect of the incandecent bulb under conditions where the bulb is used 75% of the time when heating is needed, as saving only 17 kg of CO2. I have made some calculations, and being very pessimistic, assuming your central heating has 100% efficiency, you should still save some 150 kg of CO2 over the 25000 hour lifecycle. That is not being insignificant anymore, but the study just dismisses it.

more than 4 years ago
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Cheap, Cross-Platform Electronic Circuit Simulation Software?

yope Re:Linux? (211 comments)

Please mod this one up! Oregano is indeed an excelent frontend (although with some rough edges and a few bugs) that whould run on Linux, MacOSX and probably also Windows, since it's built on GTK+.
It is quite easy and intuitive to use, works much better than gEDA, but needs some getting used to working around it's glitches, specially to discover a few tricks about how to work easily with any external spice subcircuit.
Simulation can be done through berkeley-SPICE, ngspice or GnuCAP.
It's a shame this is the only post so far mentioning it.

more than 5 years ago
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Why IT Won't Power Down PCs

yope Re:What about energy savings in heating? (576 comments)

There's no such thing as "100% efficiency conversion to heat".

Why not? Of course there is! Where does all the electric energy go that your PC consumes? I'll split it out for you:

- Most part is converted into heat directly in wire resistance and switching losses of transistors (in power supply, processor, logic, etc).

- Then there's light from the LED's and your monitor. But light ends up being transformed into heat ALWAYS, whether it is inside the room you're in, or outside (that portion of light that escapes through your windows).

- Then there's acoustic energy, from vibrating hdd heads, fans, etc... but that also ends up as heat being absorbed by walls and whatever (except maybe for the tiny fraction of noise that escapes the room).

- And finally there's moving air (from the fans) which ends up converted into heat through friction.

Conclusion: your PC is as efficient as an electric heater in generating heat... difference is that your PC can do something useful (other than generating heat) in the meantime (like downloading pr0n ;-), at no cost in terms of heat-conversion efficeincy.
Please note that I never intended to say that it is a good idea to leave your PC powered-on when not used. I merely wanted to make a point that figures stating the supposed amount of wasted energy are not quite realistic.... but it still is a waste of energy.

more than 5 years ago
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Why IT Won't Power Down PCs

yope What about energy savings in heating? (576 comments)

Leaving PC's on when they are not used is most probably a terrible waste, but I suspect that numbers about losses due to this are probably not very accurate. At least I have never seen evidence that those calculations take into account the simple fact that energy never dissapears, it only changes nature:

This way unused PC's basically transform electrical energy into heat... with 100% efficiency (!). In many parts of the world however, during important parts of the year, heating is necessary. Heating costs a certain amount of energy, whether it comes from burning gas or oil directly or from electricity is just a matter of a difference in price (heat generated from electricity is probably more expensive). Of course you'd say that leaving the heating on during the night in a building that is only used during the day is also a waste, but take into consideration that (big) buildings do have quite a considerable thermal mass, so if you keep it warmer over night, the next day you still need less energy to heat it up again.

Conclusion: when the heating is actively used, leaving your PC (or light-bulb, stand-by transformer or whatever) on when not used, will still save you money on the gas bill (but cost you more on electricity of course). The overall balance is still for a loss of course, but in some situations, a significantly smaller loss than many people tend to think.

The same idea is true for energy saving light bulbs, btw, but that's for a different discussion.

more than 5 years ago
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Tales of Conversion - Using Ubuntu at Work

yope Be careful, it might bite you... (542 comments)

Be careful with what you do! I have tried the same way, using OpenOffice to edit M$-Word documents, but after a while, I scared the sh*t out of myself when suddenly my boss started complaining that his M$-Office crashed on every single document I had worked on when he tried to print them. There where other issues too, but that sure was serious enough that I decided to start using VMware with Windows-2000 and Office-2000 on it. I hate to admit it, but those tiny incompatibilities between OpenOffice and M$-Office, might bite you sooner or later...

more than 7 years ago

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