I know you can implement division by a series (loop) of subtract and shift instructions, but explain how one would implement integer division by a multiply and shift pair.
That should be organic components, natural rubbers etc. They soften and degrade at high concentrations of biodiesel. Also, biodiesel can loosen the waxy deposits of petrodiesel, which could cause injectors to clog. So it's recommended that you gradually increase the percentage of biodiesel when you convert an existing engine to running biodiesel.
Diesels are often perceived as being difficult to start in cold weather. Also the combustion of the fuel is different, gasoline being considerably smoother running. Diesels are also perceived as having sluggish acceleration. I don't know to what extent these things are actually true, but consumers are reluctant to buy them for various reasons.
One other thing - diesel fuel used to be more difficult to obtain than gasoline. I thing stations carrying diesel fuel are plentiful enough these days that this shouldn't be a factor.
This registration system works fine enough. I think concerns of lost and missing persons are over exaggerated. The rangers go on the premise - If you aren't a full day overdue, you're not missing. Most groups that aren't back at the time they planned are back within 6-12 hrs of that. They just may have had a bit of slow going for a while. Remember that if you're the one waiting for an overdue group
If you're a hiker that has real concerns, you can just carry a GPS receiver and a cell phone. That works too.
My experience of US news reporting suggests it's often incredibly biased, especially on Middle Eastern affairs.
Yes it is. The US news reporting of much of world affairs is quite biased. I realize this much more after viewing, and listening to BBC news on local public broadcasting channels. There are a lot of important events that happen in the world that barely gets reported at all here in the states.
Not everyone in the US is quite so pro-Iraq war as some of the posters would lead you to believe.
since most of the US is fairly temperate, it's not often that it gets to freezing
Yeah right! Want to try the upper great plains? Temperatures can range from -20 F to 100 F over the course of a year.
How about the Northern Rockies? is -45 F cold enough for you? (Actual temps, not windchills, not heat indices) You've obviously lived a very confined life.
There's not enough places for commercial breaks in soccer (football to rest of world) for the TV companies to be interested in this. No commercial support, no publicity, no audience. That's pretty much it. Same goes for hockey, and hockey also has the problem with the puck not being very visible on the TV screen.
Lumber - 5x10's instead of 2x4's (a 2x4 is not even 2 inches by 4 inches) and metric lengths.
Carpeting/flooring etc - sell by sq meter instead of sq yrd.
All scales sold must use metric as Primary unit (they could also give the archaic english units)
There is a lot more use of the metric system in the US society than you might think at first glance. Those people working in anything to do with chemistry are likely using the metric system in their work.
I don't think the US will ever adopt the kilometre in place of the mile, however, because in a lot of the US, the land is plotted into 1 mile square sections and this provides a more usable unit with which to measure distances. Using km would just be more confusion.
Does anyone know if there is a metric unit that would correspond to the english bushel? (a unit of volume)
The US certainly does not look to be a leader in the wide adoption of desktop linux. He's right in saying the us will be a follower. The US government's anal policy towards intellectual property will a detriment to the advancement of science and technology in the US. The US. was built on the idea of free flow of information and ideas. Now that it's getting to be hard to make a buck in manufacturing, executives see more value in their 'intellectual property'.
Let's see :
Suns energy (Bright Sunlight direcly overhead ) is about 1 Kw/meter^2, if other posters are correct. That would be about 1Gigawatt (billion watts) per
square Kilometer (less than a square mile). My county is about 24 x 48 miles - about 1150 sq miles
times about 2.5 Km^2/mi^2 thats roughly 2,600 Gigawatts of available energy from the sun on a bright day.
Now if the conversion efficiency is even 20%, This area could produce energy at rate of 520 Gigawatts. That's one hell of a lot of power.
This is starting to sound familiar. Kind of like the mid to late '70s.
You make a good point with the military expenditures in the mid-east being related to our desire to have a stable supply of oil. Far worse atrocities have occurred in Africa than what Saddam Hussein ever done, and our government paid absolutely zero attention to these. (How many millions of people again were massacred in Rawanda? How many people are opppresed by the regime in N. Korea? ) The U.S. government does not see humanitarian reasons as being an adequate justification for sending troops do deal with a situation. Saddam was seen as a destablilizing influence in the middle east. That threatened our oil supply. That's why the Executive Office wanted him out.
Eventually the world will run out of oil and gas reserves. When that will happen - I don't know, but I'ld bet it's within 50 years. Hopefully the US will have an infrastructure in place at that time that will be able to deal with the situation.
Rignt now, the only catch is that it's still more expensive than the alternatives. Increased solar panel efficiencies, and extended lifetimes of the panels will help in changing this.
You wouldn't strictly need to locate them in the deserts. If you can produce more value by generating electricity than by groing crops, you'ld see cropland and pastureland converted as well.
If you could even generate electricity at 100 watts/m^2 (10% of solar output), with a long cell lifetime that would stll be enough to make solar power feasible.
to study whether or not making this things is 'feasible', you can bet they're not going to be cheap. At least not initially.
50% efficiencies are quite spectacular. If they could make these things cheaply in high volumes, solar power could be supplying the majority of energy needs in the future.
Those who research semiconductors these days are exploring ever new clever ways to engineer these materials. Mechanisms for tailoring the bandgaps
(by introducing materials that strain the crystal
lattice) are becoming more widely used.
The three different bandgaps allow photons over a wider range of frequencies to be captured and turned into electricty.
Grandparent has correct understanding. A battery is rated in Amp-Hours. If you uses the same battery for processor A as for low-Voltage processor B, AND processor A and B use the same amperage (probably not true) then battery life using either processors is the same. Processor B uses less Power than processor A, but that POWER would have to be dissapated (wasted) across the voltage regulator.
Battery life for processor A:
N -amp hours/ A1 amps = x hours
Battery life for processor B:
N -amp hours/ A2 amps = x hours (since A1 = A2)
If however, as normally is the case, that when you reduce the Voltage, the Amperage goes down as well (in proportion) then you get a longer battery life with processor B. (Even with dropping excess voltage across regulator)
Also, if you use a different battery ( 2.4 V instead of 3.6 V ) you can have a battery with 1.5 times as much A-H capacity in the same amount of space. The battery life again increases with processor B.
Actually I believe that the nickel-metal hydride (n-mh) batteries that are used in laptops had their origins in research done for electric vehicles. I know that they were using this type of battery in electric vehicls in the mid 80's. Their use in laptops and cell phones came aftewards.
operating frequency is another term in the function
Power is pretty much directly proportional to frequencty (for a given processor and voltage).
Power is really what you want to know when dealing with battery powered equipment. This pretty much determines battery life. Another thing that I'ld like to know when shopping for notebooks is the capacity of the battery, in Amp-Hours or milliamp-hours.
Often times to get improved performance you need to examine the algorithms used. At other times, and on certain cpu architectures, things that slow your code can be very subtle.
If you're code must process a large amount of data, look for ways of designing your program so that you serially process the data. Don't try to bring large amounts of data from a database or data file all at once if you don't have too. Once you are no longer able to contain the data in physical memory, and the program starts using 'virtual' memory, things slow down real fast. I've seen architects forget about this, which is why I'm writing this reminder.
On the other hand I've worked on a C++ project where, in a certain segment of the code, it was necessary to write our own container class to replace one of the std: classes, for performance on the SPARC architecture. Using the std: container would cause the subroutines to nest deeply enough to so that the cpu registers needed to be written out out to slower memory. The effect was enough to be quite noticeable in the app.
With today's processors, to optimize for speed, you have to think about memory utilization, since running within cache is noticably faster than from main memory. Things are not as clear cut, so far as speed optimization goes, as they once were.
Slashdot Mirror
I know you can implement division by a series (loop) of subtract and shift instructions, but explain how one would implement integer division by a multiply and shift pair.
Game Boy Advance, especially if you want to PLAY with it.
That should be organic components, natural rubbers etc. They soften and degrade at high concentrations of biodiesel. Also, biodiesel can loosen the waxy deposits of petrodiesel, which could cause injectors to clog. So it's recommended that you gradually increase the percentage of biodiesel when you convert an existing engine to running biodiesel.
It takes about 1 bushel of soybeans to make 1 gallon of biodiesel. At current prices one bushel of soybeans costs about $10.00.
One other thing - diesel fuel used to be more difficult to obtain than gasoline. I thing stations carrying diesel fuel are plentiful enough these days that this shouldn't be a factor.
If you're a hiker that has real concerns, you can just carry a GPS receiver and a cell phone. That works too.
Yes it is. The US news reporting of much of world affairs is quite biased. I realize this much more after viewing, and listening to BBC news on local public broadcasting channels. There are a lot of important events that happen in the world that barely gets reported at all here in the states.
Not everyone in the US is quite so pro-Iraq war as some of the posters would lead you to believe.
Yeah right! Want to try the upper great plains? Temperatures can range from -20 F to 100 F over the course of a year.
How about the Northern Rockies? is -45 F cold enough for you? (Actual temps, not windchills, not heat indices) You've obviously lived a very confined life.
Quite true. I like to look outside from time to time through the clear glass panes.
US became really dominant only after WW II. After much of europe had been destroyed in that war. China suffered as well at the hands of the Japanese.
There's not enough places for commercial breaks in soccer (football to rest of world) for the TV companies to be interested in this. No commercial support, no publicity, no audience. That's pretty much it. Same goes for hockey, and hockey also has the problem with the puck not being very visible on the TV screen.
Lumber - 5x10's instead of 2x4's (a 2x4 is not even 2 inches by 4 inches) and metric lengths.
Carpeting/flooring etc - sell by sq meter instead of sq yrd.
All scales sold must use metric as Primary unit (they could also give the archaic english units)
There is a lot more use of the metric system in the US society than you might think at first glance. Those people working in anything to do with chemistry are likely using the metric system in their work.
I don't think the US will ever adopt the kilometre in place of the mile, however, because in a lot of the US, the land is plotted into 1 mile square sections and this provides a more usable unit with which to measure distances. Using km would just be more confusion.
Does anyone know if there is a metric unit that would correspond to the english bushel? (a unit of volume)
The US certainly does not look to be a leader in the wide adoption of desktop linux. He's right in saying the us will be a follower. The US government's anal policy towards intellectual property will a detriment to the advancement of science and technology in the US. The US. was built on the idea of free flow of information and ideas. Now that it's getting to be hard to make a buck in manufacturing, executives see more value in their 'intellectual property'.
It doesn't look all that steep or dangerous to me. Then again, I'm not sure how stable the Rover's are.
Now if the conversion efficiency is even 20%, This area could produce energy at rate of 520 Gigawatts. That's one hell of a lot of power.
You make a good point with the military expenditures in the mid-east being related to our desire to have a stable supply of oil. Far worse atrocities have occurred in Africa than what Saddam Hussein ever done, and our government paid absolutely zero attention to these. (How many millions of people again were massacred in Rawanda? How many people are opppresed by the regime in N. Korea? ) The U.S. government does not see humanitarian reasons as being an adequate justification for sending troops do deal with a situation. Saddam was seen as a destablilizing influence in the middle east. That threatened our oil supply. That's why the Executive Office wanted him out.
Eventually the world will run out of oil and gas reserves. When that will happen - I don't know, but I'ld bet it's within 50 years. Hopefully the US will have an infrastructure in place at that time that will be able to deal with the situation.
You wouldn't strictly need to locate them in the deserts. If you can produce more value by generating electricity than by groing crops, you'ld see cropland and pastureland converted as well.
If you could even generate electricity at 100 watts/m^2 (10% of solar output), with a long cell lifetime that would stll be enough to make solar power feasible.
50% efficiencies are quite spectacular. If they could make these things cheaply in high volumes, solar power could be supplying the majority of energy needs in the future.
Those who research semiconductors these days are exploring ever new clever ways to engineer these materials. Mechanisms for tailoring the bandgaps (by introducing materials that strain the crystal lattice) are becoming more widely used. The three different bandgaps allow photons over a wider range of frequencies to be captured and turned into electricty.
Or, as i chuckle to myself when i hear the program trailer: The Engines of Our Nudity.
Battery life for processor A:
N -amp hours/ A1 amps = x hours
Battery life for processor B:
N -amp hours/ A2 amps = x hours (since A1 = A2)
If however, as normally is the case, that when you reduce the Voltage, the Amperage goes down as well (in proportion) then you get a longer battery life with processor B. (Even with dropping excess voltage across regulator)
Also, if you use a different battery ( 2.4 V instead of 3.6 V ) you can have a battery with 1.5 times as much A-H capacity in the same amount of space. The battery life again increases with processor B.
Actually I believe that the nickel-metal hydride (n-mh) batteries that are used in laptops had their origins in research done for electric vehicles. I know that they were using this type of battery in electric vehicls in the mid 80's. Their use in laptops and cell phones came aftewards.
Power is pretty much directly proportional to frequencty (for a given processor and voltage).
Power is really what you want to know when dealing with battery powered equipment. This pretty much determines battery life. Another thing that I'ld like to know when shopping for notebooks is the capacity of the battery, in Amp-Hours or milliamp-hours.
Yes, you always have to worry about those forking threads.
If you're code must process a large amount of data, look for ways of designing your program so that you serially process the data. Don't try to bring large amounts of data from a database or data file all at once if you don't have too. Once you are no longer able to contain the data in physical memory, and the program starts using 'virtual' memory, things slow down real fast. I've seen architects forget about this, which is why I'm writing this reminder.
On the other hand I've worked on a C++ project where, in a certain segment of the code, it was necessary to write our own container class to replace one of the std: classes, for performance on the SPARC architecture. Using the std: container would cause the subroutines to nest deeply enough to so that the cpu registers needed to be written out out to slower memory. The effect was enough to be quite noticeable in the app.
With today's processors, to optimize for speed, you have to think about memory utilization, since running within cache is noticably faster than from main memory. Things are not as clear cut, so far as speed optimization goes, as they once were.
Assuming there is a second version, which there may not be because potential customers found that the performance of v1.0 sucked.