I used to have a vacuum pump maintaining 50-100 microns vacuum over a period of months, using a dedicated single-vane rotary pump (I forget what cfm capacity).
As already mentioned, some of the tricks are:
1. Thin coat of high vacuum grease (no volatiles) to coat all joints.
2. Use metal T-tubes and straight-thru connectors. The ones used for plumbing (water supply line) work fine. The plastic gadgets you have may be leaking like a sieve! For the shut-off valve: try to use a metal ball-valve. Make sure its connectors are greased, and apply teflon tape to the hose-valve joints on the outside, any leaks will tend to pull the teflon inwards towards the leak, potentially sealing it.. The worm-gear clamps you are using work fine.
3. thick vacuum hose. You can get away with tygon tubing, if it is thick enough (mostly so it doesn't collapse under the vacuum).
4. Use as short a length of hose as possible. More hose, more volatiles...
5. Upon startup, do open the gas ballast, and let it pump for an hour or two to get rid of volatiles in the system (especially if the oil is old or of unknown provenance). And do check the oil level (via the idiotic little sight window).
Assuming that you want to sense the bursting of the balloon to use as the ignition trigger, the most direct way is to sense the pressure drop in the balloon itself:
Inflate the balloon, and then seal a pressure sensor in the inflation tube. The pressure should be positive (one would hope). When the balloon bursts, the pressure goes down, the feed from the sensor is then used to trigger ignition.
Re: "Thought this was a story about our elections"
@Arctic fox: arctic foxes apparently constitute the major rabies reservoir in the circum-polar region; see, for example, http://www.ncbi.nlm.nih.gov/pubmed/22102679.
The young Sun was quite a bit less luminous than nowadays, so the methane atmosphere might have helped keep water liquid on the Earth's surface.
Interestingly, there's evidence that the Earth went thru a massive ice age (snowball Earth) a few hundred million years after the period dealt with in the article. I don't know when most of the methane was replaced by an oxygen atmosphere, but a faint young Sun, and the loss of a warming blanket due to reaction with oxygen might have contributed to snowball Earth.
The pressing issue is the balloon(s) swelling so much that it / they block LOHA's path. Perhaps cutting the balloon tether & launch can be coordinated? Another idea is to intentionally bursting the balloon. Launch LOHAN during free fall, using girder-mounted aerodynamic surfaces or little drag chutes to stabilize its orientation. This is easiest if the girder is imagined as an arrow: add drag-inducing features to the top of the vertically hung girder, and a pointy tip at the other end
How about mounting LOHAN, not directly on the girder, but on a rail hung off of a swivel mount, so that LOHAN will point up vertically, regardless of whether the main girder is horizontal or not. Have to make sure that the swivel doesn't freeze up, perhaps by using kel-f surfaces, and loose tolerances (bolt size << hole size). If you want to guard against the other axis tilting, you can put in a double swivel mount...
She might not be totally off the mark. It all depends on if Google keeps Motorola at a sufficient arm's length to overcome the suspicions of the other Android vendors. These vendors would abandon Android if they think that Google will be playing favourites. Look at what happens with the Microsoft music fiasco (plays for sure, etc.)
I am not very sure of this, but I believe that slowing down an orbiting object actually raises its orbit. For example, low Earth orbit satellites whiz around the Earth several times a day, while those way up higher can be geostationary. What you need to do is the opposite of what you propose: speed up the junk, to lower its orbit.
Yes, they could encode the 4 bases (and all the combinations of ambiguities) using a nibble (4-bits, one each for A,C,G and T), as we used to do many years ago when we only had 48K RAM and 122K floppy to work with.
The large file size is more likely because each position in the genome is covered by an average of 30 reads (70% of 3E9-base genome x 30x coverage = 63 gigabases, however you want to encode it).
The reason for needing 30 or more times coverage at each position is because the high error rates during the sequencing, a combination of the quality of the DNA and the inherent limitations of the sequencer.
At a sailing/steaming/turbine speed of 30 knots, the ship would travel 0.5 nautical mile in a minute. The turning rate of large warships is not too impressive, but let's pretend that it can be instantaneous.
Ergo, the target could be anywhere in a circle of radius ca. 0.5 nautical mile. That's what the shooter has to aim for, and that's part of the reason the old fashioned battleship guns frequently have multiple barrels, to be able to fire barrages. I've heard that navies that have nuclear weapons are loathe to forsake them, because they have a large destruction radius, and, after all, you don't make permanent holes in the water.
From the point of view of the target, the trick is to use, e.g., radar, to find the projectile (the horizon is 50 miles away, so you won't see the projectile until it is already half way to you), predict its path, and avoid the patch of ocean where it will hit. Not an easy task, especially if the projectile is a slender 10 kg tungsten rod.
I believe that they were introduced (by Leyland Stanford), as a potential source of wood for railroad ties. They proved unsuitable for that purpose, and now all they do is shed debris and stink all over the state.
"Pouring through thousands of lines of code looking for holes sounds like quite a chore, unless you are very well paid."
What are you proposing to pour? A cheeky white, a robust red, or perhaps a dry sherry? Any of them should drain through the holes in the code rather nicely, and easily.
Now, poring through that code is a different matter...
The dou part is a bucket that can hold 20 kilos (usually of rice).
The northern bucket is the Chinese name for the Big Dipper (that points to Polaris, etc., etc.).
p.s. GLONASS is an acronym, that essentially means GLObal NAvigation Sputnik (satellite) System. GPS is acronym for Global Positioning System. The name Galileo is purely to honour the pioneering astronomer.
We were anchored off of San Clemente once, to dodge a bit of weather. As the sea bed fell off rapidly, and our boat's anchor chain is of limited length, we were anchored rather close to the rocky shoreline. (Our boat was a 80-foot tuna fishing vessel converted to a trawler).
As the most junior member on board (by far), I got the mid watch (midnight to 4 am). San Clemente is famous for its squid population, so we did not run any lights. The squid are attracted by light, and can swarm up around the boat, to block its bilge pump outlets. If that happens, the boat takes on water and cannot pump it back out. Not a good thing.
My main job was to try to make out the line of surf and make sure that the boat does not end up on the rocks as the turning tide and currents swing the boat around the anchor. It was not easy to see the surf, as it was a cloudy night with no moon.
Fortunately, a little bit of geometry, regarding the length of the anchor chain, and the likely depth of where the anchor lay, convinced me that we would never come close enough to the shore to present a hazard. That is, unless we dragged the anchor, that would be very bad indeed.
Fortunate for me, the watch passed uneventfully. (Unlike several other occasions that this very junior member of the crew thoroughly embarrassed himself).
Register
169 posts • joined Tuesday 27th October 2009 01:53 GMT
Page:
Re: Check your tubing
I used to have a vacuum pump maintaining 50-100 microns vacuum over a period of months, using a dedicated single-vane rotary pump (I forget what cfm capacity).
As already mentioned, some of the tricks are:
1. Thin coat of high vacuum grease (no volatiles) to coat all joints.
2. Use metal T-tubes and straight-thru connectors. The ones used for plumbing (water supply line) work fine. The plastic gadgets you have may be leaking like a sieve! For the shut-off valve: try to use a metal ball-valve. Make sure its connectors are greased, and apply teflon tape to the hose-valve joints on the outside, any leaks will tend to pull the teflon inwards towards the leak, potentially sealing it.. The worm-gear clamps you are using work fine.
3. thick vacuum hose. You can get away with tygon tubing, if it is thick enough (mostly so it doesn't collapse under the vacuum).
4. Use as short a length of hose as possible. More hose, more volatiles...
5. Upon startup, do open the gas ballast, and let it pump for an hour or two to get rid of volatiles in the system (especially if the oil is old or of unknown provenance). And do check the oil level (via the idiotic little sight window).
Don't let the pressure get to you!
Re: It won't be spam
Sardines, perhaps?
(What? No fish icon? What the fish will have to do!)
Sensing balloon burst
Assuming that you want to sense the bursting of the balloon to use as the ignition trigger, the most direct way is to sense the pressure drop in the balloon itself:
Inflate the balloon, and then seal a pressure sensor in the inflation tube. The pressure should be positive (one would hope). When the balloon bursts, the pressure goes down, the feed from the sensor is then used to trigger ignition.
Re: Down with this sort of thing....
Google is like a black hole.
First it hoovered up all web pages on the intertubes.
Then it nabbed onlline videos.
It tried/is in the process of sucking in all the holdings of librairies.
Now it is trying to grab everybody's files.
Fancy doing a Google search on somebody else's private documents?
I say use Google Drive only if your files are heavily encrypted.
<icon: Google are ultimate pirates! /icon>
Re: Agreed
My psychiatrist does a good imitation of 'Eliza'.
Re: Weird laws for sure
iirc, it's illegal to shoot an arrow in London on Sundays.
Longevity?
And how long will those organic dye molecules survive the daily assault by the (admittedly low-energy) photons?
Re: Smudge mode
What is Red Dwarf?
Re: "Thought this was a story about our elections"
@Arctic fox: arctic foxes apparently constitute the major rabies reservoir in the circum-polar region; see, for example, http://www.ncbi.nlm.nih.gov/pubmed/22102679.
Re: Welcome to Facebook, sweetheart
You can check-out any time you like,
But you can never leave!
Re: Nice of Microsoft...
The Mac OS is *nix underneath the GUI veneer.
The backdoor apparently operates in userland, not in root.
Unless you make the user confirm every time a new port is opened for network access, it will be hard to prevent this kind of backdoor.
Re: Not enough suck?
Can't understand why someone down-voted you. You got my up vote.
It's standard on-the-cheap practice to cascade vacuum pumps to get to lower pressures.
Re: Shhhhhhh
Are you hunting wabbits?
minor gripe
100 tesla = 1 million gauss = 10,000 100-gauss frig magnets.
What is frightening are magnetars, boffins claim that they have gigatesla magnetic fields.
Re: Now we know...
I totally agree.
Remember that US warship out on sea trials that had to be towed back to port?
Un Chien Andalou
an eye-opening experience.
(icon: ouch, my left eye)
Early faint Sun
The young Sun was quite a bit less luminous than nowadays, so the methane atmosphere might have helped keep water liquid on the Earth's surface.
Interestingly, there's evidence that the Earth went thru a massive ice age (snowball Earth) a few hundred million years after the period dealt with in the article. I don't know when most of the methane was replaced by an oxygen atmosphere, but a faint young Sun, and the loss of a warming blanket due to reaction with oxygen might have contributed to snowball Earth.
(flame/methane/warmth)
Re: Buy a sheep
and automatically applies fertilizer as well.
Lévy walk
Put a brick or concrete barrier all around the grass so it cannot escape, then set the bot loose on a Lévy walk.
Re: SPB Banner
Works in Safari
Re: Vaseline?
High vacuum grease is better: better seal (high viscocity), low volatiles.
It's relatively inexpensive, available in small quantities. Or, head to the nearest university chemistry department and cadge some.
No worries,
Stand firm, get a tight grip on your cricket bat, and try to swat a sixer.
Re: Storyline...
or do a playmobil version of it
Re: Vertical
I like this idea:
The pressing issue is the balloon(s) swelling so much that it / they block LOHA's path. Perhaps cutting the balloon tether & launch can be coordinated? Another idea is to intentionally bursting the balloon. Launch LOHAN during free fall, using girder-mounted aerodynamic surfaces or little drag chutes to stabilize its orientation. This is easiest if the girder is imagined as an arrow: add drag-inducing features to the top of the vertically hung girder, and a pointy tip at the other end
Swivel mount
How about mounting LOHAN, not directly on the girder, but on a rail hung off of a swivel mount, so that LOHAN will point up vertically, regardless of whether the main girder is horizontal or not. Have to make sure that the swivel doesn't freeze up, perhaps by using kel-f surfaces, and loose tolerances (bolt size << hole size). If you want to guard against the other axis tilting, you can put in a double swivel mount...
Congratulations!
Onwards & upwards!
Google might not close off Android...
She might not be totally off the mark. It all depends on if Google keeps Motorola at a sufficient arm's length to overcome the suspicions of the other Android vendors. These vendors would abandon Android if they think that Google will be playing favourites. Look at what happens with the Microsoft music fiasco (plays for sure, etc.)
Re: Reverse Thrust!
I am not very sure of this, but I believe that slowing down an orbiting object actually raises its orbit. For example, low Earth orbit satellites whiz around the Earth several times a day, while those way up higher can be geostationary. What you need to do is the opposite of what you propose: speed up the junk, to lower its orbit.
It's small enough to hide
in the Hary Nosa then?
Wrong preposition?
Would hew to (as in conform to or adhere to) suit you?
sincerely,
Your fellow pedant.
Who's to say our imaginary friend did not create everything
just 2 seconds ago?
Our entire imagined lives would be nothing but a joke.
large file size
Yes, they could encode the 4 bases (and all the combinations of ambiguities) using a nibble (4-bits, one each for A,C,G and T), as we used to do many years ago when we only had 48K RAM and 122K floppy to work with.
The large file size is more likely because each position in the genome is covered by an average of 30 reads (70% of 3E9-base genome x 30x coverage = 63 gigabases, however you want to encode it).
The reason for needing 30 or more times coverage at each position is because the high error rates during the sequencing, a combination of the quality of the DNA and the inherent limitations of the sequencer.
Where to escape to?
At a sailing/steaming/turbine speed of 30 knots, the ship would travel 0.5 nautical mile in a minute. The turning rate of large warships is not too impressive, but let's pretend that it can be instantaneous.
Ergo, the target could be anywhere in a circle of radius ca. 0.5 nautical mile. That's what the shooter has to aim for, and that's part of the reason the old fashioned battleship guns frequently have multiple barrels, to be able to fire barrages. I've heard that navies that have nuclear weapons are loathe to forsake them, because they have a large destruction radius, and, after all, you don't make permanent holes in the water.
From the point of view of the target, the trick is to use, e.g., radar, to find the projectile (the horizon is 50 miles away, so you won't see the projectile until it is already half way to you), predict its path, and avoid the patch of ocean where it will hit. Not an easy task, especially if the projectile is a slender 10 kg tungsten rod.
You are perfectly correct.
I believe that they were introduced (by Leyland Stanford), as a potential source of wood for railroad ties. They proved unsuitable for that purpose, and now all they do is shed debris and stink all over the state.
What is so glorious about Mong Kok?
It's just a translitertion of 'busy corner' in the local dialect.
A draining endeavour
"Pouring through thousands of lines of code looking for holes sounds like quite a chore, unless you are very well paid."
What are you proposing to pour? A cheeky white, a robust red, or perhaps a dry sherry? Any of them should drain through the holes in the code rather nicely, and easily.
Now, poring through that code is a different matter...
Knee jerk much?
I hear that it is purely a spinal reflex, no higher brain functions involved.
will
low orbit ion cannon be satisfactory?
The race to embrace & extend ePUB3 is on!
(see title)
This is particularly amusing
since programming the original MacOS used either assembly or Pascal (see. e.g., the venerable 5 volume "Inside Macintosh" guide from 1985).
A basic knowledge of Latin may be useful, but the world has moved on somewhat in the meantime.
(Flame icon, 'cos how many of us can still start a fire by striking together a couple of chunks of rock?).
This is a conflict between
expectations for keyboards versus pointing devices (mice).
The finger is the replacement of the mouse as far as touch screens are concerned.
Hence, mouseDown and mouseUp events. As any fule snows, they do different things.
Hence, pick up your fingers when you are typing.
With that kind of position accuracy,
Your momentum must be awfully imprecise.
Any chance that this can be applied to the LOHAN project?
Was it a
Zune?
Well! If you insist on
running over helmets and sundry other road hazards, nothing will protect you.
Pedant alert
Beidou is literally northern bucket.
The bei part means north.
The dou part is a bucket that can hold 20 kilos (usually of rice).
The northern bucket is the Chinese name for the Big Dipper (that points to Polaris, etc., etc.).
p.s. GLONASS is an acronym, that essentially means GLObal NAvigation Sputnik (satellite) System. GPS is acronym for Global Positioning System. The name Galileo is purely to honour the pioneering astronomer.
I feel the cynicism rising in my craw
I'd like to see a patent (money) trail on all this.
The usual motivation for broadening a definition in the commercial realm is to claim possession of what you don't already own.
swinging on the anchor
We were anchored off of San Clemente once, to dodge a bit of weather. As the sea bed fell off rapidly, and our boat's anchor chain is of limited length, we were anchored rather close to the rocky shoreline. (Our boat was a 80-foot tuna fishing vessel converted to a trawler).
As the most junior member on board (by far), I got the mid watch (midnight to 4 am). San Clemente is famous for its squid population, so we did not run any lights. The squid are attracted by light, and can swarm up around the boat, to block its bilge pump outlets. If that happens, the boat takes on water and cannot pump it back out. Not a good thing.
My main job was to try to make out the line of surf and make sure that the boat does not end up on the rocks as the turning tide and currents swing the boat around the anchor. It was not easy to see the surf, as it was a cloudy night with no moon.
Fortunately, a little bit of geometry, regarding the length of the anchor chain, and the likely depth of where the anchor lay, convinced me that we would never come close enough to the shore to present a hazard. That is, unless we dragged the anchor, that would be very bad indeed.
Fortunate for me, the watch passed uneventfully. (Unlike several other occasions that this very junior member of the crew thoroughly embarrassed himself).
Happy Holidays!
simples
just make sure that the user has the option of disallowing the use of the gpu.
cosmic cannonball
flying out from the poop deck?
<sorry, can't resist /sorry>
Close:
The banker Tick would yell, "Espana eschews escrow".
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