The first place I interned had a real simple set-up for calibrating pressure sensors. It consisted of a column of water which was adjusted using an R.C. fuel pump connected to a large D.C. bench top power supply. Idea was that the operator would pump the water column up to a known height and compare that to the reading from the sensor. Well, one day the pump failed, and the water column drained back into the gallon milk jug that acted as a resevour for the water column. Unfortunitly, the water colum contaied more than a gallon of water. The milk jug ended up overflowing into the power supply which was strategically placed under the gallon jug.
My thought when I saw this happening was "oh shit!", especially considering the supply was turned on at the time. Fortunitly, the water drained straight out through the bottom of the supply and never touched the electronics. All I did was use shop air to blow out the water and it worked fine.
Remember violent explosions only happen on TV for effect. The real world is usually much less dramatic.
Just for the record, I had a car battery explode a few feet away from me (some dumbass swapped the positive and negative terminals from a charger and plugged it in). Despite the fact that everything within a good ten feet of the battery was pock-marked with damage from the eletrolyte, I somehow avioded any chemical burns. We later found bits and pieces of the battery 30+ feet away.
If you short-circuit a car battery, you are going to have two problems to deal with. The first problem is the heat produced by the massive current supplied from the battery. This will occur at the short circuit, along the wires carrting the current, and at the battery. Secondly, the massive current will likely produce a large amount of hydrogen gas within the battery. If you are unlucky, this gas will be ignited by the heat or arc produced by the short circuit, causing the battery to explode.
An appropriatly sized capacitor could probably take care of the sags, but large electrolytic capacitors (probably the type you're thinking of) generally suck at filtering out spikes and transients.
But none of that really matters. Computers generally operate off of several different voltages, many of which supply a non-trivial amount of current. You would need to design a supply which would produce each of the required voltages from the 12V supply. If you are capable of designing and building the supply from scratch, you probably won't have much trouble dealing with the nastyness of an automotive 12V supply.
Not only that, but when the power franchises come up for renewal with the local municipalities, providing "at cost" broadband service will give them a leg up over compeating bids and help them expand into other markets.
Unless the door is meant to lock someone in, most doors are set up so that they can be opened from the inside regardless of whether or not the door is locked.
Additionally, there are battery-powered electronic locks. We use one with a card-reader to control access to our amateur radio club station. I'm not sure of the manufacturer, but these locks are used all over campus to control rooms where only a certain subset of students should have access.
At my university the computer center is housed in the oldest building on campus. This building also contains a foundry, welding shop, E.E. labs, etc. While I have no idea what the circumstances in this instance were, I imagine many acedemic institutions have similar set-ups. It's not overly difficult so see how a fire could start and quickly spread in such a building.
I've had excellent luck so far. I've had 8 12-week internships with two different companies during my (almost over) college career. All paid. There are pleanty of paid co-op/internship positions out there if you look.
Hints:
1. Don't limit yourself to any region or industry. Why narrow the field unnecessarily.
2. Don't limit youself to a particular discipline. Your a student: learn! I'm E.E, but have had terms which were primarily ME, IE, manufacturing, coding, etc. in addition to a few terms of pure E.E. work.
3. Look everywhere, large companies often have well structured programs and probably the best chance of post-graduation employment, but small companies will often take someone for a term or two for a specific task.
A similar problem exists on the D-Link DI-704P router/firewall. Essentially, any http request not formated exactly as the router expects causes the router to stop handling packets for several minutes. I reported this bug to D-Link, but was told the problem does not exist, despite the fact that other people were able to recreate the problem! KDE Bug #40538 has the details as the konquer browser triggers the problem.
We signed up for charter cable internet service about six months ago (S.W. Michigan area), the enterire process went like this:
1. Drive down to local service center to get modem and sign up for service.
2. Drive down to Best Buy and pick up router/firewall.
3. Drive home, connect cables, and surf away.
Notice, there was no software that needed to be installed, no activiation, etc. Now if you want to hear about my experiance with Ameritech DSL... (grr)
My school implemeted a similar policy several weeks ago, citiing a warning letter from the BSA. I imagine this is something that will happen more and more in coming months as 1.) the BSA sends out scare letters and 2.) Schools get sick of having legitimate educational traffic degraded for P2P file swapping.
There are some situation which are accidents. If two skiiers/boarders collide side-to -side (been there), it is usually because neither was aware of the other's presence.
Most of the time when I've seen people collide like this, it is because they are making wide sweeping turns in opposite directions such that the convex sides of their paths meet. In this case, neither is in the other's field of view, as each person tends to be looking ahead for hazards.
First make sure this won't get you into legal trouble, as it may really piss off the store.
Go to a participating store. Appear at the checkout with a large number of items you wish to purchase (two cartloads of perishable food items should be good; extreamly heavy/bulky/difficult to handle items work, too). Offer to pay with a check, but refuse to give a finger/thumb print. Kindly ask the cashier if there is any way to pay with a check, but without giving the print. If the answer is no, explain to the cashier (better yet, their manager) that since they won't accept your check you have no way to pay. Leave (without the merchandise, of course).
Employees of the store will have to restock your entire attempted puchase, and some perishable items may have to be discarded. Enough people doing this will make it clear to the store that excessive ID collection is not an economically sound move.
Of course, a lot of MUD/MUSH/MOO/whatever's have strict rules about when, where, and how it is legal to kill other players. Players who break the rules and circumvent the game's playerkilling safeguards are often subject to severe punishment from the immortals/admins.
There appear to be four masts surrounding the telescope (two visible, looks like there are guy wires for two mre). Anyone know what these are for? (Maybe lightning protection?)
Secondly, although the article does not absolutely say where this vehicle will run, I doubt it will be on a busy interstate.
My thoughts exactly. Every time I've seen electric/solar college competition vehicles on a public road, they've always had lead and chase cars.
Re:It's heavier, consumes more power, etc...
on
Rear View LCD?
·
· Score: 2
So they turn them off (against the rules) for the best of both worlds - lower wind resistance, lower power consumption - but at the risk of being disqualified.
I understand how turning off the camera/lcd systems saves power, but I'm curious how it reduces wind resistance. It seems like both for aerodynamics and for protection of the system, you would put the camera behind clear a clear plastic window shaped to match the contours of the body panel. Thus, nothing sticking up into the wind whether on or off. What am I missing here?
Can someone out there explain what, if anything, is the mathematical significance of Lychrel numbers? I understand the basic definition, but I'm not sure what is gained by showing a particular number is or isn't a Lychrel number.
Q3: Why can't I use a cable longer than 3 or 5m?
A3: USB's electrical design doesn't allow it. When USB was designed, a decision was made to handle the propagation of electromagnetic fields on USB data lines in a way that limited the maximum length of a USB cable to something in the range of 4m. This method has a number of advantages and, since USB is intended for a desktop environment, the range limitations were deemed acceptable. If you're familiar with transmission line theory and want more detail on this topic, take a look at the USB signals section of the developers FAQ.
Essentially, the USB cable is a mismatched transmission line. As a result, the signal reflects off of the ends of the cable, resulting in a stair-step pattern whenever the voltage level on the line changes. As the cable gets longer, it takes more time for this stair-step pattern to settle to the final voltage.
They speak Spanish in Peru, therefor posible is the correct spelling. You can verify this on the Peru Posible website, which btw is the number 1 hit on google for the word 'posible'.
JPEG uses a lossy compression algorithm which is excellent for compressing real-world images. JPEG does not handle the high frequency content (aka sharp edges) found in most logos well.
GIF (and PNG) use loss-less compression algorithms which are excellent for images with large fields of constant or similar color and/or low color depths. These formats will produce very large files for most real-world images, but very small files for typical logos.
Using a GIF for their logo is common sense, not neccessarily an abandonment of the JPEG standard.
Also, the MTBF for cheap DC fans is usually around 20000 hours. That means a bit less than 2 hours and a half. Either replace them beofre, check them cautiously before that mark, or get some higher quality fans
An interesting thing to keep in mind is that only about a third (actually e^1 for those who care) of all parts will survive with no failures until the MTBF.
Slashdot Mirror
The first place I interned had a real simple set-up for calibrating pressure sensors. It consisted of a column of water which was adjusted using an R.C. fuel pump connected to a large D.C. bench top power supply. Idea was that the operator would pump the water column up to a known height and compare that to the reading from the sensor. Well, one day the pump failed, and the water column drained back into the gallon milk jug that acted as a resevour for the water column. Unfortunitly, the water colum contaied more than a gallon of water. The milk jug ended up overflowing into the power supply which was strategically placed under the gallon jug.
My thought when I saw this happening was "oh shit!", especially considering the supply was turned on at the time. Fortunitly, the water drained straight out through the bottom of the supply and never touched the electronics. All I did was use shop air to blow out the water and it worked fine.
Remember violent explosions only happen on TV for effect. The real world is usually much less dramatic.
Just for the record, I had a car battery explode a few feet away from me (some dumbass swapped the positive and negative terminals from a charger and plugged it in). Despite the fact that everything within a good ten feet of the battery was pock-marked with damage from the eletrolyte, I somehow avioded any chemical burns. We later found bits and pieces of the battery 30+ feet away.
If you short-circuit a car battery, you are going to have two problems to deal with. The first problem is the heat produced by the massive current supplied from the battery. This will occur at the short circuit, along the wires carrting the current, and at the battery. Secondly, the massive current will likely produce a large amount of hydrogen gas within the battery. If you are unlucky, this gas will be ignited by the heat or arc produced by the short circuit, causing the battery to explode.
An appropriatly sized capacitor could probably take care of the sags, but large electrolytic capacitors (probably the type you're thinking of) generally suck at filtering out spikes and transients.
But none of that really matters. Computers generally operate off of several different voltages, many of which supply a non-trivial amount of current. You would need to design a supply which would produce each of the required voltages from the 12V supply. If you are capable of designing and building the supply from scratch, you probably won't have much trouble dealing with the nastyness of an automotive 12V supply.
Not only that, but when the power franchises come up for renewal with the local municipalities, providing "at cost" broadband service will give them a leg up over compeating bids and help them expand into other markets.
Unless the door is meant to lock someone in, most doors are set up so that they can be opened from the inside regardless of whether or not the door is locked.
Additionally, there are battery-powered electronic locks. We use one with a card-reader to control access to our amateur radio club station. I'm not sure of the manufacturer, but these locks are used all over campus to control rooms where only a certain subset of students should have access.
A (very large) company I spent some time interning for had the following to say regarding e-mail and other electronic communications (paraphrased):
Do not write anything in an e-mail you would not want read on national television.
At my university the computer center is housed in the oldest building on campus. This building also contains a foundry, welding shop, E.E. labs, etc. While I have no idea what the circumstances in this instance were, I imagine many acedemic institutions have similar set-ups. It's not overly difficult so see how a fire could start and quickly spread in such a building.
PAID internship? Good luck
I've had excellent luck so far. I've had 8 12-week internships with two different companies during my (almost over) college career. All paid. There are pleanty of paid co-op/internship positions out there if you look.
Hints:
1. Don't limit yourself to any region or industry. Why narrow the field unnecessarily.
2. Don't limit youself to a particular discipline. Your a student: learn! I'm E.E, but have had terms which were primarily ME, IE, manufacturing, coding, etc. in addition to a few terms of pure E.E. work.
3. Look everywhere, large companies often have well structured programs and probably the best chance of post-graduation employment, but small companies will often take someone for a term or two for a specific task.
A similar problem exists on the D-Link DI-704P router/firewall. Essentially, any http request not formated exactly as the router expects causes the router to stop handling packets for several minutes. I reported this bug to D-Link, but was told the problem does not exist, despite the fact that other people were able to recreate the problem! KDE Bug #40538 has the details as the konquer browser triggers the problem.
We signed up for charter cable internet service about six months ago (S.W. Michigan area), the enterire process went like this:
1. Drive down to local service center to get modem and sign up for service.
2. Drive down to Best Buy and pick up router/firewall.
3. Drive home, connect cables, and surf away.
Notice, there was no software that needed to be installed, no activiation, etc. Now if you want to hear about my experiance with Ameritech DSL... (grr)
100*((3.3-2.8)/(2.8)) ~= 17.9% >> 2%
Anyone remember the satire-wire spoof? It's not so funny anymore.
My school implemeted a similar policy several weeks ago, citiing a warning letter from the BSA. I imagine this is something that will happen more and more in coming months as 1.) the BSA sends out scare letters and 2.) Schools get sick of having legitimate educational traffic degraded for P2P file swapping.
There are some situation which are accidents. If two skiiers/boarders collide side-to -side (been there), it is usually because neither was aware of the other's presence.
Most of the time when I've seen people collide like this, it is because they are making wide sweeping turns in opposite directions such that the convex sides of their paths meet. In this case, neither is in the other's field of view, as each person tends to be looking ahead for hazards.
First make sure this won't get you into legal trouble, as it may really piss off the store.
Go to a participating store. Appear at the checkout with a large number of items you wish to purchase (two cartloads of perishable food items should be good; extreamly heavy/bulky/difficult to handle items work, too). Offer to pay with a check, but refuse to give a finger/thumb print. Kindly ask the cashier if there is any way to pay with a check, but without giving the print. If the answer is no, explain to the cashier (better yet, their manager) that since they won't accept your check you have no way to pay. Leave (without the merchandise, of course).
Employees of the store will have to restock your entire attempted puchase, and some perishable items may have to be discarded. Enough people doing this will make it clear to the store that excessive ID collection is not an economically sound move.
Of course, a lot of MUD/MUSH/MOO/whatever's have strict rules about when, where, and how it is legal to kill other players. Players who break the rules and circumvent the game's playerkilling safeguards are often subject to severe punishment from the immortals/admins.
There appear to be four masts surrounding the telescope (two visible, looks like there are guy wires for two mre). Anyone know what these are for? (Maybe lightning protection?)
Secondly, although the article does not absolutely say where this vehicle will run, I doubt it will be on a busy interstate.
My thoughts exactly. Every time I've seen electric/solar college competition vehicles on a public road, they've always had lead and chase cars.
So they turn them off (against the rules) for the best of both worlds - lower wind resistance, lower power consumption - but at the risk of being disqualified.
I understand how turning off the camera/lcd systems saves power, but I'm curious how it reduces wind resistance. It seems like both for aerodynamics and for protection of the system, you would put the camera behind clear a clear plastic window shaped to match the contours of the body panel. Thus, nothing sticking up into the wind whether on or off. What am I missing here?
Can someone out there explain what, if anything, is the mathematical significance of Lychrel numbers? I understand the basic definition, but I'm not sure what is gained by showing a particular number is or isn't a Lychrel number.
From The USB FAQ
Q3: Why can't I use a cable longer than 3 or 5m?
A3: USB's electrical design doesn't allow it. When USB was designed, a decision was made to handle the propagation of electromagnetic fields on USB data lines in a way that limited the maximum length of a USB cable to something in the range of 4m. This method has a number of advantages and, since USB is intended for a desktop environment, the range limitations were deemed acceptable. If you're familiar with transmission line theory and want more detail on this topic, take a look at the USB signals section of the developers FAQ.
Essentially, the USB cable is a mismatched transmission line. As a result, the signal reflects off of the ends of the cable, resulting in a stair-step pattern whenever the voltage level on the line changes. As the cable gets longer, it takes more time for this stair-step pattern to settle to the final voltage.
Wrong.
They speak Spanish in Peru, therefor posible is the correct spelling. You can verify this on the Peru Posible website, which btw is the number 1 hit on google for the word 'posible'.
JPEG uses a lossy compression algorithm which is excellent for compressing real-world images. JPEG does not handle the high frequency content (aka sharp edges) found in most logos well.
GIF (and PNG) use loss-less compression algorithms which are excellent for images with large fields of constant or similar color and/or low color depths. These formats will produce very large files for most real-world images, but very small files for typical logos.
Using a GIF for their logo is common sense, not neccessarily an abandonment of the JPEG standard.
Check the plug-in directory. I've had no problems playing vorbis files on my computer via xmms.
Also, the MTBF for cheap DC fans is usually around 20000 hours. That means a bit less than 2 hours and a half. Either replace them beofre, check them cautiously before that mark, or get some higher quality fans
An interesting thing to keep in mind is that only about a third (actually e^1 for those who care) of all parts will survive with no failures until the MTBF.