While I think there are still unanswered questions about human generated CO2, the reality is that we have significantly increased CO2 concentrations in the atmosphere.
I am not for shutting down the global economy to reduce CO2 emmissions over the short term, but I think the industrialized countries should consider research on reasonable non-CO2 emitting technologies (i.e. safer nuclear fission) to hedge our bets.
"Web designer" is a dead job, it is out there with "desktop publisher" or "typist." A few years ago, everyone was a web designer. Now even people who do have good design skills and can apply them in both Web and print mediums are dime-a-dozen.
Here in Washington, DC, everyone I know with hard programming skills (i.e. BSCS) are employed. IT folks without a college degree have more problems, but still most of them I know have found something.
A few IT folks I know have gone into mortgage sales and doing well (and no doubt following the next boom/bust cycle...)
Here's a factoid: I found my current tech job on the Net. My wife found her last job on the Net, and her current job in a University school newspaper (she is a web designer and found one of the last profitable content Web sites to work for...but she is also getting a second BS in CS on the side).
1) Gasoline is the cheapest way to power an automobile. It has the lowest total fuel cycle cost. It is cheap to make the raw materials (few dollars per barrel of oil) cheap to refine ($0.40 per gallon) easy to distribute and easy to store. There is little evidence this will change over the next 10-20 years. I don't think it will change over the next 20-40 years.
2) Any technology that is going to change fact #1 is going to require immense government action (subsidies or taxes).
3) The economic distortion will lead to black markets that make the War on Drugs look winable.
Did Apollo get to the moon? Yes. Seen anyone on the moon recently? No.
It is easy for governments to achieve specific technological goals, but they don't have a good record on creating economically efficient technological industries.
You can briefly push aside basic economics, but in the end, they'll get you. (USSR, etc.)
Reed's analysis, badly presented in Salon, deals with networks of wireless nodes that not only use frequency diversity (e.g. spread spectrum), but also use multiple antennas for spatial diversity (e.g. phase arrayed antennas) and the nodes cooperate not only for relaying (e.g. mesh network) but also for detecting and eliminating interference.
All of these elements increase the efficiency of radio spectrum use.
Abstract: Multiuser receivers improve the performance of spread-spectrum and antenna-array systems by exploiting the structure of the multiaccess interference when demodulating the signals of a user.
YOU CAN'T TRANSMIT AN ARBITRARILY LARGE AMOUNT OF DATA/SECOND ON A FINITE AMOUNT OF BANDWIDTH
You mean through an information channel of finite bandwidth.
However radio paths exist in a 3D environment, which can multiply the number of channels of finite bandwidth. Reed's point is really about mesh networks and using spatial diversity receivers to create more "pipes" (i.e. channels) through the air at the same frequency.
In his concepts, mesh networked receivers can even work together to untangle interfered signals. It doesn't lead to infinite information capacity, but it sure is higher than what most radio spectrum is used for today.
Reed really shouldn't say that there isn't interference...it is that interference as physicists know it is a useful and constructive tool (as in holograms), unless your radio architecture is stupid (i.e. uni-frequency, uni-source broadcast).
The replier is correct. All biofuels require tremendous amounts of energy to create, and are economically unfeasable. A lot goes into growing a plant (sun, land, erosion, fertilizer, etc.)
There probably would be zero gasahol fuel mixes in the US without special subsidies and tax breaks. You can get a barrel of oil out of the ground in Saudi Arabia for just a dollar or two.
I don't think hydrogen fuel cycles are going to be economical without using reformed hydrocarbons. Electrolysis is not very efficient.
How many pounds of oil was required for fertilizer to produce a gallon of BioDiesel? How much water? How much soil runoff entered the local rivers and streams?
I notice that there are a lot of fuel-efficient small cars from Europe. I don't think most would pass US emmissions or crash testing...
I know a new teacher in Montgomery County, Maryland, who was put through education grad school by the county and put to work at $40K on day 1.
My impression is that pay has little to do with teacher retention. It isn't like programmer pay, but then again, the truth is that education school is not quite like CS school either...
The biggest problem I see is that in public schools, children and mean, nasty, and basically run rampant. A lot of this is due to the rights inherent in government operations, and lawsuit threats. As a teacher, your first job is child control, but you have to watch out for the lawsuit minefield.
I also know a very educated person who tried to be a teacher in Maryland, but after six months he couldn't take the kids, and quit, despite the fact that it paid much better than what he was previously doing (in archeology).
I know many other school teachers who would like to quit, mainly due to student discipline issues, but can't because they can't find equivalent work for equivalent pay.
I think some of these discipline issues exist in private schools as well, but the fact that 1) they don't have to provide all government mandated rights to students and 2) parents are paying good money to have their kids there, and may apply their own "child control" to insure the benefits of their investment may mitigate some of those issues.
I've been kind of amazed at the battery life of the Sanyo SCP5300. My wife takes all kinds of pictures, uploads them, and talks on it a lot, but has not yet run down the battery.
The MeshAP/Meshbox solution builds a backbone wireless mesh network using AODV, but also presents a standard wireless AP to client PCs (or at least that is how I understand it to work).
MeshAP/MeshBox from LocustWorld is based on AODV routing module. There are also userspace versions of AODV. Plus there are at least two other competing mesh routing algorithms, and there are other hardware mesh solutions, but MeshAP has a lot going for it.
Profits of drug companies that make only generic drugs only are higher than those that engage in R&D of patented drugs. It is hard to sort out why, but clearly patented drug companies need to do R&D, FDA approval testing, and marketing for drugs. Generic companies just need to make it.
I think the interesting comparison is this: I know plenty of people who have put their music on MP3.com for free copying, despite the fact that they could have refused and only sold their music on a pay-per-play basis.
I know plenty of people who write computer programs and make them available in the public domain, despite the fact that they could have made it payware.
On the other hand, I don't know anyone who has made a life-saving drug and made it available for free...
Slashdot Mirror
While I think there are still unanswered questions about human generated CO2, the reality is that we have significantly increased CO2 concentrations in the atmosphere.
I am not for shutting down the global economy to reduce CO2 emmissions over the short term, but I think the industrialized countries should consider research on reasonable non-CO2 emitting technologies (i.e. safer nuclear fission) to hedge our bets.
You become cash flow positive when cash is coming into your bank faster than it is flowing out.
You become net income profitable when your recognized income is higher than your recognized costs.
The difference between the two could be due to timing of income and cost recognitions.
Or their definition of "cash-flow positive" might be "operating cash-flow positive" which does not include capital spending.
OK, I don't find XML a challenge, but there is really a sharp learning curve in trying to describe even a simple Web service in WSDL.
Of course, if you write in in C#, it will make the WSDL for you, but writing WSDL descriptions of "legacy" Web services is quite painful.
"Web designer" is a dead job, it is out there with "desktop publisher" or "typist." A few years ago, everyone was a web designer. Now even people who do have good design skills and can apply them in both Web and print mediums are dime-a-dozen.
Here in Washington, DC, everyone I know with hard programming skills (i.e. BSCS) are employed. IT folks without a college degree have more problems, but still most of them I know have found something.
A few IT folks I know have gone into mortgage sales and doing well (and no doubt following the next boom/bust cycle...)
Here's a factoid: I found my current tech job on the Net. My wife found her last job on the Net, and her current job in a University school newspaper (she is a web designer and found one of the last profitable content Web sites to work for...but she is also getting a second BS in CS on the side).
I thought you meant this WETA Digital.
Chemical energy comes from energy changes in covalent bond breaking/making. Mass is always conserved, but electrons may end up in different places.
Similarly, throwing a weight out a window releases energy because the weight ended up in a different place (a different graviational potential).
If anyone has a citation of mass loss in a chemical reaction, please let me know!
1) Gasoline is the cheapest way to power an automobile. It has the lowest total fuel cycle cost. It is cheap to make the raw materials (few dollars per barrel of oil) cheap to refine ($0.40 per gallon) easy to distribute and easy to store. There is little evidence this will change over the next 10-20 years. I don't think it will change over the next 20-40 years.
2) Any technology that is going to change fact #1 is going to require immense government action (subsidies or taxes).
3) The economic distortion will lead to black markets that make the War on Drugs look winable.
Did Apollo get to the moon? Yes. Seen anyone on the moon recently? No.
It is easy for governments to achieve specific technological goals, but they don't have a good record on creating economically efficient technological industries.
You can briefly push aside basic economics, but in the end, they'll get you. (USSR, etc.)
Reed's analysis, badly presented in Salon, deals with networks of wireless nodes that not only use frequency diversity (e.g. spread spectrum), but also use multiple antennas for spatial diversity (e.g. phase arrayed antennas) and the nodes cooperate not only for relaying (e.g. mesh network) but also for detecting and eliminating interference.
All of these elements increase the efficiency of radio spectrum use.
Optimal Operation of Wireless Networks
Combined Space Time Diversity and Interference Cancellation for MIMO Networks
Information Theory at the Extremes
Linear Multiuser Receivers: Effective Interference, Effective Bandwidth and User Capacity
Abstract: Multiuser receivers improve the performance of spread-spectrum and antenna-array systems by exploiting the structure of the multiaccess interference when demodulating the signals of a user.
YOU CAN'T TRANSMIT AN ARBITRARILY LARGE AMOUNT OF DATA/SECOND ON A FINITE AMOUNT OF BANDWIDTH
You mean through an information channel of finite bandwidth.
However radio paths exist in a 3D environment, which can multiply the number of channels of finite bandwidth. Reed's point is really about mesh networks and using spatial diversity receivers to create more "pipes" (i.e. channels) through the air at the same frequency.
In his concepts, mesh networked receivers can even work together to untangle interfered signals. It doesn't lead to infinite information capacity, but it sure is higher than what most radio spectrum is used for today.
Reed really shouldn't say that there isn't interference...it is that interference as physicists know it is a useful and constructive tool (as in holograms), unless your radio architecture is stupid (i.e. uni-frequency, uni-source broadcast).
If we are really concerned about CO2 pollution, there is only one existing dense energy source that is low-CO2 emmitting, nuclear fission.
E=MC^2, no chemical reaction can beat that.
The replier is correct. All biofuels require tremendous amounts of energy to create, and are economically unfeasable. A lot goes into growing a plant (sun, land, erosion, fertilizer, etc.)
There probably would be zero gasahol fuel mixes in the US without special subsidies and tax breaks. You can get a barrel of oil out of the ground in Saudi Arabia for just a dollar or two.
I don't think hydrogen fuel cycles are going to be economical without using reformed hydrocarbons. Electrolysis is not very efficient.
How many pounds of oil was required for fertilizer to produce a gallon of BioDiesel? How much water? How much soil runoff entered the local rivers and streams?
I notice that there are a lot of fuel-efficient small cars from Europe. I don't think most would pass US emmissions or crash testing...
PBS has several internship slots open this summer, including ones for CS or EE students.
The ABL is nothing compared to the ATL, the airborne tactical laser that can be equipped to a V-22 Osprey, or an AC-130 "son of Specter" AC-X gunship. Read more about it here and here (search for ATL)
I live in Washington, DC. Post 9/11, I can't fly a private plane here, much less a flying car!
I know a new teacher in Montgomery County, Maryland, who was put through education grad school by the county and put to work at $40K on day 1.
My impression is that pay has little to do with teacher retention. It isn't like programmer pay, but then again, the truth is that education school is not quite like CS school either...
The biggest problem I see is that in public schools, children and mean, nasty, and basically run rampant. A lot of this is due to the rights inherent in government operations, and lawsuit threats. As a teacher, your first job is child control, but you have to watch out for the lawsuit minefield.
I also know a very educated person who tried to be a teacher in Maryland, but after six months he couldn't take the kids, and quit, despite the fact that it paid much better than what he was previously doing (in archeology).
I know many other school teachers who would like to quit, mainly due to student discipline issues, but can't because they can't find equivalent work for equivalent pay.
I think some of these discipline issues exist in private schools as well, but the fact that 1) they don't have to provide all government mandated rights to students and 2) parents are paying good money to have their kids there, and may apply their own "child control" to insure the benefits of their investment may mitigate some of those issues.
OK, maybe this is OT, but Diet Vanilla Coke is much more palatable to me than plain old Diet Coke. For us zero-cal drinkers...
I've been kind of amazed at the battery life of the Sanyo SCP5300. My wife takes all kinds of pictures, uploads them, and talks on it a lot, but has not yet run down the battery.
The MeshAP/Meshbox solution builds a backbone wireless mesh network using AODV, but also presents a standard wireless AP to client PCs (or at least that is how I understand it to work).
Someone correct me if I am wrong!
What is the price of the MeshLAN routers and APs? Who retails them?
CarlaZone bllog has uploads of live images from a cell phone with a web cam...
Mesh Routing links.
MeshAP/MeshBox from LocustWorld is based on AODV routing module. There are also userspace versions of AODV. Plus there are at least two other competing mesh routing algorithms, and there are other hardware mesh solutions, but MeshAP has a lot going for it.
Profits of drug companies that make only generic drugs only are higher than those that engage in R&D of patented drugs. It is hard to sort out why, but clearly patented drug companies need to do R&D, FDA approval testing, and marketing for drugs. Generic companies just need to make it.
I think the interesting comparison is this: I know plenty of people who have put their music on MP3.com for free copying, despite the fact that they could have refused and only sold their music on a pay-per-play basis.
I know plenty of people who write computer programs and make them available in the public domain, despite the fact that they could have made it payware.
On the other hand, I don't know anyone who has made a life-saving drug and made it available for free...
Get a low ID on Slashdot, get excellent Karma, sell it in EBay
Has this actually ever happened?
Won't changing your PIN from the initial one the bank assigns you avoid this problem?