Forgot your password?

Comment: Re:Haven't done T-SQL in years (Score 1) 4

by Marxist Hacker 42 (#47437797) Attached to: Fun with SQL Server 2012

I didn't explain the behavior adequately.

SELECT * FROM dbo.GetReferencedModelPointsByJobID(@JobID)

Returns someplace between 2-56 rows, depending on JobID

The second query does NOT error out, but is not returning a comma delimited string of all rows, but instead, in some cases, is returning only ONE row.

Since I'm using this to build a temp table, it doesn't error out until I attempt to fill columns in the temp table that do not exist.

Comment: That said... (Score 4, Informative) 49

by Rei (#47437451) Attached to: Sand-Based Anode Triples Lithium-Ion Battery Performance

... the greater your capacity, the less cycle life matters. If you want an EV that battery that will run a 250Wh/mi vehicle for an average 20 miles a day for 15 years, then you want it to cycle through about 30MWh. If you use a 100 mile (25kWh) battery pack, then that's 1100 cycles. If you use a 200 mile (50kWh) battery pack, then that's 550 cycles. If you use a 400 mile (100kWh) battery pack, then that's a mere 275 cycles. Actually, the improvement is even better than that in the real world, because the greater your capacity vs. how far you're actually driving, the more you can cycle the cells through a less destructive state of charge range rather than doing deep discharges.

A lot of people picture battery packs in EVs backwards, they think that things like hybrids stress the packs the least, PHEVs moderately, and EVs the worst. But it's reversed. If you look at how big hybrid packs are vs. how much electric range they hold, you'll see that they're disproportionately large, even after you factor in any differences in Wh/kg. The reason is that because hybrid packs get cycled so much, they have to keep the cycling in a very narrow state of charge range, only allowing shallow discharges. So if you only have a narrow discharge range, you have to make your pack bigger to make up for it. EVs can discharge through much more of their pack because they need fewer total cycles and only rarely go down toward the lower end of their allowable discharge range. Some EVs also let you limit the max that your pack charges up to to further extend lifespan (it's usually destructive both to use the very top end and the bottom end of the discharge range).

Comment: Re:Correct me if I'm wrong, but... (Score 4, Informative) 49

by Rei (#47437401) Attached to: Sand-Based Anode Triples Lithium-Ion Battery Performance

1024 mAhg1 is excellent capacity even vs. brand new graphite or amorphous carbon, about 3x as much as graphite's maximum. Silicon's theoretical max is 8-10x that of graphite, but the main problem with it is durability, it tends to tear itself apart on loading. There are silicon anodes in some newer li-ion cells on the market, but the tech is in its infancy.

That said, the real papers you want to be on the lookout for are cathode improvements, there's a lot more potential for volume/mass reduction there than in the anode. But it seems to be a more difficult challenge. Getting a 3x improvement in anode density is absolutely not the same a getting a 3x improvement in battery life.

Comment: Re:Little Bit of History Repeating. (Score 3, Insightful) 49

by Rei (#47437377) Attached to: Sand-Based Anode Triples Lithium-Ion Battery Performance

Commercial li-ion battery energy densities have continued to improve during that time period, including the commercial introduction of cells with silicon anodes. Of course, silicon anodes are a new tech, so there's a great deal of room for improvement, which probably won't come close to "maxing out" for a decade or more.

Of course, that said, this article is your typical fluff piece following the guidelines of fluff science reporting.

1. Present an oversimplified version of one technology challenge that may or may not address the biggest issue and certainly doesn't address all of them - but don't mention that.
2. Introduce an outside-the-establishment loner with a passion - or at least someone you can try to present as "outside the establishment" and glaze over anyone who helped him.
3. Loner gets a "vision" based on some everyday activity
4. Present their solution and make it out to be a huge revolution that will certainly solve all our problems - if they can only get corporate backing / funding!

I think these sort of articles hurt the image of science because people read them, think "OMG, all our problems are solved!", then when everything's not solved afterward, fail to trust science in the future. For example, in this case, the most important element to improve is the cathode, not the anode. And cathode improvements are less common and usually less major than anode improvements. There's also tons of different anode improvements out there in various stages of research. Pretty much all of the silicon ones get way better than graphite or amorphous carbon.

That doesn't mean that this isnt an important paper - actually, from looking at it, it looks pretty good. It's just not "all that".

BTW, anyone know how credible this journal is? I see it's hosted on but not part of Nature, and I tried to find an impact rating for it but couldn't.

+ - In New Zealand The Right To Silence And Presumption Of Innocence Are In Danger->

Submitted by cold fjord
cold fjord (826450) writes "The New Zealand Herald reports, "Fundamental pillars of the criminal justice system may be eroded whichever party wins the election this year, as both National's and Labour's proposals would look into changing the right to silence or the presumption of innocence in rape cases. Both major parties claim the current system is not upholding justice for victims, and are looking at changes that would effectively make it easier for prosecutors to obtain convictions. National wants to explore allowing a judge or jury to see an accused's refusal to give evidence in a negative light, while Labour wants to shift the burden of proof of consent from the alleged victim to the accused.""
Link to Original Source

+ - Magnetic Field of Earth Weakening a Sign Poles Are Flipping->

Submitted by Trachman
Trachman (3499895) writes "The magnetic field of Earth is weakening more rapidly than many scientists thought it would, a sign that Earth’s magnetic poles might flip within a few hundred years as opposed to thousands of years. Data collected from Swarm, the collective name for three European Space Agency (ESA) satellites, confirms that Earth’s magnetic field is weakening, something which has led to many past switches in Earth’s magnetic poles.Deep ocean core studies have confirmed, according to NASA, that the Earth’s magnetic poles reverse on a relatively frequent basis. They usually switch anywhere from 200,000 to 300,000 years. As it has been 700,000 years or so since a flip has taken place, Earth is overdue for one. The weakening magnetic field might be a sign that the switch will occur sooner, rather than later. Scientists, according to a report by LiveScience, had thought that Earth’s magnetic field was weakening by about five percent every hundred years. At that rate, they calculated that a flip in the Earth’s magnetic fields would not happen for around another 2,000 years. However, the new data from Swarm indicates that Earth’s magnetic field is actually currently weakening at a rate of five percent every decade instead of century. That rate is 10 times faster than the scientists had allowed for in their calculations about when the next flip would happen. That being said, we know that the Earth's magnetic field is primary protecting shield from cosmic particles and, consequently, is a primary factor to the Earth's temperature.

My Scoop is following: At the risk of being not popular here at Slashdot I dare to ask: can magnetic field changes and climate changes be connected and analyzed in concert?"

Link to Original Source

Comment: Re:self-correcting (Score 1) 24

by PopeRatzo (#47434551) Attached to: These secular priests just keep slicing on the drive

And the Bible said it was OK to stone adulterers and that you shouldn't eat shellfish or touch your wife while she's menstruating.

Read the Gospel;

Which one? The ones that the Council of Nicea approved? Or the older ones or the ones Luther approved?

See that's the problem with religion: It's made by men and yet is supposed to be above the review of men.

User Journal

Journal: Fun with SQL Server 2012 4

Journal by Marxist Hacker 42

I have a Table Valued Function that returns a simple parameterized view. I want to turn that view into a string.

Can anybody tell me why the first query works and the second one doesn't?


SET @JobID=2861

If a camel is a horse designed by a committee, then a consensus forecast is a camel's behind. -- Edgar R. Fiedler