Slashdot: News for Nerds


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!



Google Offers a Million Bucks For a Better Inverter

Chirs 240V is fairly common (255 comments)

240V would be used for kitchen stove/range, clothes drier, electrical heat (air and water). Some commercial cappucino machines use 240V.

A home shop could very well use 240V for a welder and any number of power tools...lathe, jointer, planer, tablesaw, mortiser, wide belt sander, dust collector, shaper, etc.

3 days ago

Google Offers a Million Bucks For a Better Inverter

Chirs it's 240V in USA/Canada (255 comments)

In the USA/Canada typical residential setups use two conductors at 120V to ground, but the conductors are out-of-phase so there is 240V between them.

There really isn't any such thing as 110V or 230V in the USA/Canada, both of which you'll sometimes see referenced. 208V does exist, it's the difference between two legs of a 3-phase setup where each leg is at 120V to ground.

3 days ago

Verizon's Accidental Mea Culpa

Chirs that's a stupid argument (390 comments)

If it were all about "even" traffic flows, then netflix could have their clients send garbage data back to balance out the flows. This would result in *more* traffic on the network overall, but hey it'd at least be balanced!

No...the traffic is there because it was *requested by verizon's subscribers*. There is no logical reason why cogent/level3 should pay extra for traffic requested by verizon. I know this is how it was done in the past, but that was under the assumption that the types of flow is more or less similar. In the case of verizon, it's mostly consuming data rather than sending it, so it shouldn't be treated as a regular peer.

about a week ago

People Who Claim To Worry About Climate Change Don't Cut Energy Use

Chirs not always self-centeredness (708 comments)

caveat: I live in Canada, your mileage may vary.

When I see a person panhandling on the street, I know full well that there are social assistance programs, welfare, employment insurance, homeless shelters, retraining programs, health care programs, etc. In many cases, they have trained professionals who will probably do a much better job than me of helping people that need help. In a sense that means that *I have already helped them* by supporting a society and government that includes these programs, and by funding them with my tax dollars. In many cases the problem is just getting people into programs that will work for them.

That said, I still help people out sometimes if I think it makes sense. Most of the time though my charitable giving goes outside the country to places with less of a social safety net.

about two weeks ago

Interviews: Ask Juan Gilbert About Human-Centered Computing

Chirs would mod up if I could... (30 comments)

It seems to me that we want to simultaneously be able to prove to the voter that their vote was counted properly, while also wanting to ensure that the voter cannot prove to someone else that they voted a certain way (to prevent buying/coercing votes).

Adding to do you ensure that the person voting is who they say they are, and not another family member, care provider, guest, etc.?

about two weeks ago

Bug In Fire TV Screensaver Tears Through 250 GB Data Cap

Chirs Generally okay with gov't competing. (349 comments)

Again is it okay for the government to compete with private enterprise?

Others may disagree, but I think so, yes. (Assuming they compete on merits rather than legislation.)

Around here (Saskatchewan, Canada) the main telco is a government-owned and they have excellent wireless coverage in rural areas. My electricity comes from a government-owned utility, and their rates are controlled to cover costs and build infrastructure. My natural gas comes from a government-owned utility that has huge underground storage tanks all over the province so they can buy gas at low prices and store it for winter. (Important, winters are cold here.) The main vehicle insurer is government-owned with controlled rates, and of course police/fire services are government-run.

The only real complaint I have with a government-run organization is liquor stores--and that's a political issue since there's nothing stopping them from implementing a solution where I could order booze via a website and have it shipped to my house with the appropriate taxes automatically paid to the government.

about three weeks ago

It's Not a Car, It's a Self-Balancing Electric Motorcycle (Video)

Chirs recumbant and enclosed (218 comments)

Being able to put feet down requires a more upright and open riding position.

Removing that requirement enables a recumbant seating position (for better aerodynamics) and a fully-enclosed cabin. Making the cabin fully-enclosed allows for better protection from weather, better soundproofing, air conditioning, etc.

about a month ago

It's Not a Car, It's a Self-Balancing Electric Motorcycle (Video)

Chirs self balancing when stopped (218 comments)

The key to this one is that you don't need to put feet down when stopped, so it can be recumbant and fully-enclosed.

about a month ago

3-D Printing with Molten Steel (Video)

Chirs mostly, but not always (104 comments)

Some really intricate parts are cheaper to 3D-print than to try and cast/forge/machine traditionally. Think hollow structures with stiffening ribs or cooling channels inside, or other similarly complicated shapes. The SuperDraco rocket engine falls into this category (though of course also is a small production run).

about a month ago

Code Spaces Hosting Shutting Down After Attacker Deletes All Data

Chirs distinction between managed and unmanaged (387 comments)

With managed hosting, the provider handles support, backup/restore, etc. Typically with "the cloud" the resources are unmanaged. The end-user is responsible for all of that stuff.

I don't believe Amazon themselves offer managed services, but there are lots of other companies that will sell you managed services built on AWS.

about a month ago

Code Spaces Hosting Shutting Down After Attacker Deletes All Data

Chirs better businesses prepare for disasters (387 comments)

Nobody is saying they were legally responsible to prevent crime.

People *are* saying that they were poor businessmen who didn't plan for disasters. (What if the cloud provider failed catastrophically, or they lost all the passwords, or any number of other catastrophic events?)

about a month ago

Wireless Industry Lobbying Hard to Keep Net Neutrality Out

Chirs even for VoLTE it doesn't really make sense (85 comments)

Even for VoLTE, why should your voice get priority over my data? What if my "data" is actually voice via a different app?

Arguably, all packets should be shaped initially based on the subscription plans of the subscribers without regard for data type. Then *within the packet stream of an individual subscriber* they could prioritize based on traffic type, but it should be up to the subscriber to indicate whether they want this to be done, what should be prioritized, etc.

about a month ago

Android Needs a Simulator, Not an Emulator

Chirs only a problem with virtualbox (167 comments)

KVM and VMWare Player can run VMs simultaneously without any problem.

about a month ago

Are US Hybrid Sales Peaking Already?

Chirs pretty sure toyota tried it (377 comments)

and found that they got better mileage with the "unnecessarily complex dual drive train" than they did with the charging-only engine.

about a month ago

EU's Top Court May Define Obesity As a Disability

Chirs some other factors (625 comments)

1) It's not about how much you eat, but how much your body converts to fat. I went on Atkins and lost quite a bit of weight while still eating lots of calories.

2) If you severely cut down on calories, your body can become more efficient at using the calories it does eat.

So the trick is to convince your body that it's not hungry, doesn't need to be efficient, and doesn't need to store fat against future needs.

about a month and a half ago

Red Hat Enterprise Linux 7 Released

Chirs wasn't impressed with their driver (231 comments)

The Mellanox driver code I saw was pretty messy, especially the SR-IOV support. And their device model is sort of weird for anyone used to "traditional" ethernet hardware. But they're really the only game in town for 40gig.

In contrast, the Intel 10gig drivers are reasonably clean, follow the same device model as their other ethernet hardware, and their datasheets are available for anyone to download.

about a month and a half ago

Red Hat Enterprise Linux 7 Released

Chirs kernel drivers shouldn't make assumptions (231 comments)

For exactly the reason that you describe, a kernel driver that is intended to be built on many different kernel versions really shouldn't be making assumptions based on the version number, it should test for the actual desired functionality.

about a month and a half ago

Cisco Opposes Net Neutrality

Chirs simpler solution (logically if not technically) (337 comments)

The simplest solution is:

1) ISPs apply traffic shaping to each subscriber separately, without looking at packet type, source, destination, etc. The only criteria are which subscriber the packet belongs to, and what level of subscription they've paid for.

2) As an optional step (opt-in or opt-out) the ISP can do QoS within the packets belonging to a particular subscriber. This would only affect that subscriber, nobody else. Ideally this would be under the control of the end-user in some way, via ToS packets, classification rules, etc.

about a month and a half ago

Cisco Opposes Net Neutrality

Chirs that's your definition, but not mine (337 comments)

To me, Net Neutrality means that all traffic (regardless of far end *or* type) should be treated equally.

The only fair way to allocate resources on a subscriber network is by doing traffic shaping based on the subscriber plan, *without looking at traffic type*.

Suppose we've both paid for an identical subscription. I use my entire bandwidth for streaming video and torrenting, you use your entire bandwidth for videoconferencing. Traditional QoS would give your packets priority over mine. Since we're paying the same, that makes no sense!

The ISP should shape both our streams based on our subscriber plans. As an optional step they could apply QoS to the traffic belonging to each individual subscriber, but that would only affect the traffic for that specific subscriber.

about a month and a half ago



skydiver to attemp record jump from 131,000 feet

Chirs Chirs writes  |  more than 5 years ago

Chirs (87576) writes "Former 64-yr old french paratrooper Michel Fournier is attempting to break multiple world records by jumping out of a helium balloon at 40 kilometers (131,000 feet) altitude. They anticipate that he will break the sound barrier on the way down, taking 15 minutes to fall and reaching speed of over 1500km/hr.

The big concern at the moment is the wind. Anything over 10km/hr will cause problems getting the massive balloon inflated. The previous attempt failed when the baloon was destroyed by wind while still on the ground.

Some links: CNN Canadian Press"


Chirs has no journal entries.

Slashdot Account

Need an Account?

Forgot your password?

Don't worry, we never post anything without your permission.

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>
Create a Slashdot Account