Beta
×

Welcome to the Slashdot Beta site -- learn more here. Use the link in the footer or click here to return to the Classic version of Slashdot.

Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

Comments

top

Is Storage Necessary For Renewable Energy?

Agripa Re:Expert?? (432 comments)

There is no such thing as negative energy price, unless you're retarded? Why would you pay someone to take your excess energy, when you can just dump it into the atmosphere through a resistor heating element? They are not that expensive, even if you have to finance one. Of course you might be benevolent and give it away for free, or even exert some effort out of love to they neighbor, and pay some for him to take it, but in a selfish capitalist view you can get rid of energy very easily, it's not like trash that is costly to get rid of.

Because of political rents.

If wind production is subsidized, then I may make money by paying someone to take electricity and power a giant electric heater with it. Even if I lost money by doing this, I might loose less money than if I did not sell the power at all. That may sound ridiculous but it happened not long ago in Texas because of wind power subsidies.

yesterday
top

Is Storage Necessary For Renewable Energy?

Agripa Re:Expert?? (432 comments)

I once worked for an engineer who previously had a physicist working for him. The physicist couldn't understand why a couple of 6-volt lantern batteries in series wouldn't start his car - after all, they were putting out 12 volts.

An explanation geared for a physicist would have helped. "Imagine a spherical frictionless 12 volt potential source in free space with a 1 ohm resistor in series with it ..."

yesterday
top

NVIDIAs 64-bit Tegra K1: The Ghost of Transmeta Rides Again, Out of Order

Agripa Re:special 128MB buffer of main memory? (125 comments)

In fact, it's fairly difficult to make RAM to decimal prefixes.

You'll have to pry my 2.147483648 Gb DRAMs from my cold, dead hands!

5 days ago
top

Idiot Leaves Driver's Seat In Self-Driving Infiniti, On the Highway

Agripa Re:Huh? (406 comments)

I wonder which of actively controlling the vehicle or maintaining enough situational awareness to do so would be more tiring.

about two weeks ago
top

Idiot Leaves Driver's Seat In Self-Driving Infiniti, On the Highway

Agripa Re:Submission with a spelling error, say it isn't (406 comments)

Driverless cars will probably be mandatory in the future, and my guess is that the insurance will become so prohibitively high, that you'll find it much cheaper to buy an automated car.

Manual control of a powered vehicle will be an organ bank crime. Obscure?

about two weeks ago
top

Microsoft Tip Leads To Child Porn Arrest In Pennsylvania

Agripa Re:Really? (353 comments)

You can argue that the justice system might have an axe to grind against pedo's, and you're probably right, but they're still afforded due process.

But if this is not a search for purposes of the 4th Amendment, then the NSA or FBI or whoever can just provide a list of things for service providers to search for in general. Why limit it to child pornography?

And isn't that one of the current proposals to make current government searches legal in light of Snowden's leaks?

about two weeks ago
top

Microsoft Tip Leads To Child Porn Arrest In Pennsylvania

Agripa Re:Which company is next in line? (353 comments)

It certainly covers "We search your files based on a list of unlawful content given to use by the government."

I am sure there is something in their EULA which states that you surrender your 4th Amendment rights so it is all good.

about two weeks ago
top

40% Of People On Terror Watch List Have No Terrorist Ties

Agripa Re:High success rate or lots of unknowns? (256 comments)

If the people are dangerous and they find out they can't fly (which could really only be because they were on the No Fly list) then wouldn't that make them more likely to do something.

No, because they know that if they do something, they will be put on the No Fly list twice.

about two weeks ago
top

Hack an Oscilloscope, Get a DMCA Take-Down Notice From Tektronix

Agripa Re:Analog (273 comments)

For an older analog oscilloscope calibration is not difficult but for one that stores the calibration data digitally, calibration can be a problem.

Changing aluminum electrolytic capacitors is just another maintenance task for a test instrument old enough to need it.

about two weeks ago
top

Hack an Oscilloscope, Get a DMCA Take-Down Notice From Tektronix

Agripa Re:Analog (273 comments)

You don't need a recent Tektronix for that. As a matter of fact, I have a Tek 547 with a full suite of plug-ins. Does everything I need, and will probably continue to do so even after I'm dead. The scope's already half a century old, the original owner died 20 years ago.

A Tektronix 547 does more than most need and some things modern DSOs cannot like alternate sweep. My solution for that was to buy two of the same DSO.

I don't design and build my own brushless motor controller for example. What the hell for?

Oddly enough, Tektronix did design and build their own brushless motor controllers for maybe 2 decades.

about two weeks ago
top

Hack an Oscilloscope, Get a DMCA Take-Down Notice From Tektronix

Agripa Re:Analog (273 comments)

Differential amp with mV sensitivity but with hundreds of volts of common mode range? Yeah, and? Who cares?

These are handy for offline switching power supplies and high power audio amplifiers.

DC-50MHz current probe? Again, who cares? If you're that determined to get a current waveform, design your board with a current to voltage chip. You know, those systems on a chip? Then use a ADC and pump the data out to a PC.

These is also handy for switching power supplies and it is not always convenient to design in a ground referenced current output.

Analog? You mean a code word for "thinks he's saving money but is actually wasting time"?

I do not know why they even train analog engineers anymore.

about two weeks ago
top

Why Morgan Stanley Is Betting That Tesla Will Kill Your Power Company

Agripa Re:Until we learn how to use less ... (502 comments)

We can use gravity systems for storage.

Even if there were suitable locations for these which are not already developed, the Greens will stomp them out of existence like they have nuclear power plants.

Fuck, if this was 1930, we would be doing it all ready. Now everyone is a whiny ass afraid of big projects.
The bests roads, best education system, best space agency, tallest buildings, longest bridges all see to be in the US, but apparently everyone has given up and have no problems watching out civilization built into straw start to blow away. At least billionaires get to keep more billions and suck money out of the system; which is what kills the middle class..

The rent seeking politicians and lawyers won.

about two weeks ago
top

Why Morgan Stanley Is Betting That Tesla Will Kill Your Power Company

Agripa Re:Small-scale, real-time. (502 comments)

So what happens when solar power makes baseload power uneconomical and those plants which stabilize the grid are shut down? In effect, existing baseload power plants are subsidizing solar and wind just by existing.

about two weeks ago
top

Why Morgan Stanley Is Betting That Tesla Will Kill Your Power Company

Agripa Re:Good, I say (502 comments)

I have worked on plenty of continuously powered instrumentation and test gear older than that which never displayed the problem you describe with the copper itself disintegrating although insulation often becomes brittle or fails in other ways. What I would believe though is that the decaying insulation outgassed something which attacked the copper and I have seen that happen even on insulated wire newer than World War 2. With insulation which does this, higher temperature operation accelerates the process.

about two weeks ago
top

A Router-Based Dev Board That Isn't a Router

Agripa Re:Why flash and not microSD? (54 comments)

Do SD cards implement background scrubbing? Using NAND Flash as a replacement for NOR Flash always strikes me as unreliable given the short storage time of high density NAND memory. I have already seen older consumer devices that use high density NAND Flash for firmware storage "self brick" after a period of time and I suspect this is what caused it.

about two weeks ago
top

Senate Bill Would Ban Most Bulk Surveillance

Agripa Re:Alright! Go Senate bill (176 comments)

If Obama's actual position is not to support the bill, he may do so anyway for good publicity if he knows it will not pass anyway. The two parties do this all the time in the House and Senate when it is known that a Bill will not pass but it is advantageous for some members to vote for it anyway.

about three weeks ago
top

Enraged Verizon FiOS Customer Seemingly Demonstrates Netflix Throttling

Agripa Re:Alternative explanation (398 comments)

It's tempting to imagine the internet as a giant blob of fungible bandwidth, but in reality it's just a big mess of cables some of which are higher capacity than others.

Wibbly Wobbly Timey Wimey ... Stuff.

Just wait until it becomes more economical to sell IPv4 addresses via tunneling.

about three weeks ago
top

Enraged Verizon FiOS Customer Seemingly Demonstrates Netflix Throttling

Agripa Faster VPN Access (398 comments)

Back when I was in the process of switching providers, I bought a subscription to a VPN service so I could have a secure connection and routable IP through public internet access points. Later one of the things I noticed with my new AT&T U-Verse service was that *all* access was faster in either latency or throughput using the VPN to tunnel through U-Verse to half way across the US including things like DNS. Some things were a little bit faster and some things were an order of magnitude faster.

about three weeks ago
top

How a Solar Storm Two Years Ago Nearly Caused a Catastrophe On Earth

Agripa Re:FUD filled.... (212 comments)

That particular storm still caused catastrophic failure of a 500kV 1200MVA transformer at the Salem nuclear power plant in New Jersey. They happened to have a suitable replacement available which was originally intended for another power plant so they were only offline for a few weeks.

about three weeks ago
top

Google Offers a Million Bucks For a Better Inverter

Agripa Re:so... (260 comments)

Unfortunately, that's not true. The output is AC and the input-referred current will reflect it, i.e. will be quite high when the output reaches its highest (340V). Since the input source has an equivalent internal resistance of 10Ohm and would droop too much, some bulk capacitance is needed to provide these 120Hz current surges.

I should have been more specific but I agree.

There are other ways to reduce input ripple current besides capacitive decoupling. A PFC stage operating in continuous conduction mode would help and may be needed anyway because of the voltage drop across the 10 ohm source resistance. I wonder if such would take up less space than extra bulk input capacitance.

about three weeks ago

Submissions

Agripa hasn't submitted any stories.

Journals

Agripa has no journal entries.

Slashdot Login

Need an Account?

Forgot your password?

Submission Text Formatting Tips

We support a small subset of HTML, namely these tags:

  • b
  • i
  • p
  • br
  • a
  • ol
  • ul
  • li
  • dl
  • dt
  • dd
  • em
  • strong
  • tt
  • blockquote
  • div
  • quote
  • ecode

"ecode" can be used for code snippets, for example:

<ecode>    while(1) { do_something(); } </ecode>