Re: Job Vacancy - queue here
Or OfWhack, for our American friends.
77 posts • joined 12 Jun 2009
Or OfWhack, for our American friends.
It may be easy to calculate a spacecraft position far into the future from a SPICE kernel, but that doesn't mean that the calculated position will be accurate. SPICE is just a data format and a set of subroutines to interpret that data. It's not a panacea for the fundamental difficulty of accurately modelling the orbit of spacecraft around Mars.
I'm guessing that the major stumbling blocks are uncertainties in the gravity field of the planet and the atmospheric drag -- remember that MAVEN is actually sampling the Martian upper atmosphere. Both of these uncertainties severely limit the accuracy of a long-term ephemeris of a spacecraft in an orbit like MAVEN's.
It's nice to see that Microsoft is finally catching up to where Unix was, circa 1975 :-)
I'm gravely disappointed that no mention was made of boffins in this article, given that one of the co-authors of the paper in ApJ Letters is Dr Henri Boffin.
As long as you don't mind waiting a couple of centuries :-)
It's not the orbit. I've read the original paper in Science, and this is the area in which I got my Ph.D. Trust me, it's not the orbit. It's the rotation.
"The team used data from Cassini to build a 3D model of the moon's orbit and found it wobbles twice as much as it ought."
Not its orbit. They built a 3D model of Mimas itself, using surface features as landmarks. Then they used those landmarks to track subtle changes in the satellite's rotation.
I'd expect this kind of sloppy reporting in a tabloid, but the Register really should aim for a higher standard of scientific accuracy.
I'm reminded of the anecdote about Seymour Cray told by Microsoft's Jim Gray. When Cray was told that Apple had just bought one of his supercomputers to design the next generation of Macs, Cray commented that he'd just bought a Mac to design his next supercomputer.
I just logged in and it was working fine.
The IAU rules (http://www.iau.org/public/themes/naming/) are quite clear about pandering to politicians:
"The names of individuals or events principally known for political or military activities are unsuitable until 100 years after the death of the individual or the occurrence of the event."
So Joe Biden can't have an asteroid named after him until he's been pushing up the daisies for a century.
I very much doubt that the astronomers will succeed in naming it Biden, because the International Astronomical Union has a policy which explicitly forbids naming of astronomical objects after politicians.
I bought a Chromecast via Amazon this week to find out whether it would help me to escape from Virgin Media TiVo / BBC iPlayer hell. In short, VM's TiVo system cannot play on-demand TV using the BBC iPlayer. The video stream glitches every few seconds, making it pretty much unwatchable. According to the VM engineer who came to check our newly-installed TiVo after I complained about the crap iPlayer video quality, this is apparently a known problem, but neither Virgin nor the BBC will admit responsibility.
Anyway, I'm happy to report that Chromecast solves the problem. I can now cast BBC iPlayer video streams from my smartphone or tablet to my TV, and the quality is excellent. Thank you, Google.
Nobody has mentioned the elephant in the room -- not everyone has an aptitude for programming, just as not everyone has an aptitude for maths, or languages, or music.
Some years ago, Richard Bornat (a computer science professor at Middlesex University) and his graduate student Saeed Dehnadi did research which demonstrated that in their class of first-year computer science undergraduates, there were two distinct groups: those who intuitively understood how to write programs, and those who didn't. Worryingly, the performance of the second group could not be significantly improved by training them. This was published as a paper titled "The camel has two humps". (You can find it by googling the title.)
Now Gove wants to try to force school kids to write computer programs, when most of them will have neither the interest nor the aptitude for it. It's a recipe for disaster.
As anyone who saw the movies the first time around will tell you :-)
Curious to know why El Reg now has a theology correspondent.
It's a delicious irony that the ad surrounding this news article at the moment is for Amazon Web Services :-)
"MySQL built-in replication just doesn't work unless you have a properly designed application. By "properly designed" I mean something that's aware of DB replication scenarios and which uses the database architecture for relational key tracking."
I'm sorry, Trevor, but either this is a troll or you really don't understand MySQL replication and you're just repeating what some bloke down the pub told you once.
Applications do NOT need to be aware of replication. I should know -- I've written large-scale applications which talk to MySQL databases that had replication slaves. Not once did I have to alter my code because of that. And these days I get paid to manage hundreds of MySQL servers, ALL of which have replication slaves, a fact that most of the developers are blissfully unaware of. And that's how it should be, of course.
Are you talking about multi-master replication? <Shudder>
There are open-source solutions that allow you to avoid that kind of thing, such as Galera Cluster, as well as commercial products.
Thankfully, I don't have to support multiple primary sites, so I've avoided having to implement such setups.
You say "None of the databases for our public websites can be set up for live replication because that would require rewriting code to accommodate it." and in the next paragraph, you state that you're using MySQL.
MySQL has had built-in near-real-time replication to a remote mirror server for over a decade. I was using it as a data-protection solution back in 2002! It doesn't require any changes to client code, since it happens within the database server.
And there are robust open-source solutions for backing up a running server, such as Percona's XtraBackup.
Yes. And don't call me Shirley.
... is that one of Scotland's ancient seats of learning is now handing out Ph.D. degrees in Human Resource Management.
It's a pity that this otherwise excellent article fails to mention Sergei Korolev, who was as great a rocket scientist as Werner von Braun.
IIRC, "baby boomer" is anyone born between 1946 and 1964, so some of us haven't even reached 50 yet.
"Will never have the endorsement of the scientific community as a whole."
The scientists who publish in the open-access, peer-reviewed Public Library of Science (PLOS) journals would be surprised to hear that. In the life sciences community, the PLOS journals have a strong reputation.
I wish these guys every success, but I'm reminded of the excellent "MongoDB is web scale" cartoon from a couple of years ago:
This is an excellent web site, and it gives predictions for lots of other satellites and assorted space junk too. I've been using it for many years.
The great thing about the ISS is that its orbit is at just the right inclination to the Earth's equator so that it occasionally passes directly overhead if you're anywhere south of Birmingham.
I occasionally work from home, logging in to work via SSH.
Since the July "upgrade", my SuperHub drops SSH connections after a minute or two of inactivity, which is a serious pain in the ass.
Fortunately, I'm using a Linux box, so I can tweak the kernel's TCP keepalive settings, which solves the problem.
At university, Trevor was more interested in getting drunk and trying to get laid than learning stuff, so he blames Java.
Lots of developers don't know how to test their code properly, so Trevor blames Java.
There's a word for you, Trevor. It begins with "pill" and ends with "ock". Hint: there are no missing letters.
I'm surprised that the Romney app doesn't automatically baptise the user into the Mormon faith.
"I am no virgin, I have a girlfriend and regular sex,"
I'm sorry, but inflatable girlfriends don't count.
Nor do the ones with four legs.
I've never had any problems with the broadband hardware from VM, or with the service, which has been excellent for the past ten years. My original (NTL) cable modem gave me nine years of trouble-free operation, and when it did finally expire at the end of last year, VM sent out a replacement SuperHub immediately with no fuss and at no cost to me.
BT, on the other hand, failed repeatedly to fix a persistent fault on my landline, so I dropped them, and I never intend to use them again if I can possibly help it.
... if journalists stopped referring to them as "boffins". You may think it's amusing, but it's not. It's a lazy shorthand for the tired old stereotype of the "mad scientist" who's not quite like "normal" people.
You obviously missed the excellent documentary "A Grand Day Out" by that nice Mr Nick Park.
Could it be that the Kindle app is the one that's being monitored by Flurry's spyware, and this is skewing the figures?
The Met Office should dump Flash, and use a platform-neutral technology instead.
The U.S. state of Idaho is in two time zones. The southern part of the state -- which includes most of the population and the state capital Boise -- keeps Mountain Time (7 hours behind GMT), but the northern part keeps Pacific Time (8 hours behind GMT), so you have to change your watch as you travel north/south, not east/west.
The reason is that north Idaho has closer economic ties to eastern Washington state (which keeps Pacific Time) than it does to the rest of Idaho, so the clocks in north Idaho match those in Washington.
The fundamental problem in the UTC versus TAI debate is that the length of the second in the SI system was defined in 1967 so that it matched the then-standard astronomical second.
That in turn had been defined in 1952 in such a way that it matched 1/86,400 of the length of the average day sometime in the middle of the 19th century.
So the SI second doesn't even begin to approximate 1/86,400 of the current day length, and this is why leap seconds are needed every few years.
It gets worse. The Earth's rotation rate is diminishing at a roughly linear rate, so the UTC-TAI clock error is growing quadratically. By the end of this century, we could be adding leap seconds every two or three months.
I haven't seen any problems with my VM broadband service in Cambridge.
I've been with VM since the days when they were still NTL, and I find their broadband service very reliable. Like Alex Walsh, I've only experienced a tiny number of outages that lasted more than a few minutes.
"I discovered it's nearly impossible to transfer files from my Linux box"
I don't have any problems with this. I run an ssh server on my Linux box, and an SFTP client on the Xoom. Job done.
"there's no charging over USB as you must use the proprietary brick"
USB provides power at 5 volts, but the Xoom has a 7.4 volt battery. Ye cannae change the law of physics, as a well-known Scotsman once said.
Microsoft taking others to task for shipping insecure software? The irony almost made my brain explode.
I tried to use the Royal Mail web site on Saturday to check on a delivery that I was expecting. The holding page had a list of telephone numbers for various services, including one for tracking deliveries, so I called it, and got a cheerful recorded message which told me that it would be much quicker to use the web site.
Eventually, an automated system asked me to read out the tracking reference, which I did. After a short pause, it told me the stunning news that "Your package is progressing through our network."
So, not only a FUBAR web site, but a truly useless alternative.
That's a bit harsh on estate agents, don't you think?
The dreaded HR sift never gets beyond the first page, so you have to make your CV shout "HIRE ME!!!" in just one page.
I wonder whether Dominic realises that anyone in the European Union is legally entitled to work in Britain, and they ALL have foreign names!
It's not only Southern Electric whose web-based meter reading system can't cope with actual readings that are lower than the company's estimated reading.
A couple of months ago, I tried to enter my own gas meter reading into Scottish Power's web site. It was 20 units lower than the estimated reading on the bill I'd just received, and Scottish Power were proposing to raise my monthly payment by a hefty amount based on their estimate, so I was keen that they should get the true reading.
Their web site refused to accept my reading. It told me twice that I'd made a mistake, and on the third attempt, it told me to expect a call from their customer service department.
After waiting for several days, I called Scottish Power myself, and a friendly customer service person was happy to enter the correct reading. I suppose I should be glad that they didn't try to bill me for 10,000 non-existent units of gas!
I mis-read the by-line as "Dominic Connor is a quaint headhunter in the City".
The article makes a whole lot more sense this way.
Next week ... Chief Rabbi Lord Sacks tells us why we should all adopt Agile, and the Bishop of Bath and Wells gives the Church of England's perspective on version control systems.
... you've clearly never seen the havoc that Ruby on Rails can cause.
I recently witnessed a Rails application bring an Oracle database server to its knees because it wasn't using bind variables. Instead, the Rails app hammered the server with millions of explicit SQL queries that were identical except for the value of the column in the where clause. It pretty much killed the Oracle query cache.
The DBAs still grimace in pain when Rails is mentioned.