"miniscule compared to the toxic stuff released during the generation of the extra electricity required for the incandescent bulb."
That depends on the type of exhaust scrubbers fitted to the coal power plant and the type of coal used. I'd wager that technology exists and is actually being used to make the exhaust pretty much free of toxic stuff. The sulfur is converted to gypsum (used in drywall), the ashes are an additive to concrete, etc..
What cannot be suppressed is the (nontoxic) CO2 emission. It would be good to quantify things beyond "a lot" and "much more". Electricity can be converted to electricity to electricity at 1 to 2 kWh/kg depending on who you believe (can't be bothered to find out why different values exist). Assumie a CFK lasts 3000 h (actually they should last 6x longer, but it seems to be too optimistic for many use cases) and an incandescent 1000 h. A 60 W incandescent will use 180 kWh over 3000 h, i.e. 90 to 180 kg of coal. The CO2 emission is about 3.5 times that weight.
$200 for an 80x80 FLIR camera? Which model is that? I'm looking at the FLIR selection, but the only one that comes close is an IR plugin for an iPhone, 80x60 pixels. At a 9 Hz frame rate, I don't think that sensor would be suitable for analyzing road obstacles while driving, never mind the resolution.
You don't use high-resolution cameras for this job. You use a highly sensitive normal camera and then you use the thermo camera right next to it for object detection and for gain control on the primary camera.
That would sound plausible, except that the image that they show in the video clip (0:28) is a fairly high-resolution fully thermal image without blending with a visible-light image.
It's thermal infrared cameras. The color of the clothes doesn't matter. Except maybe if they cover themselves in aluminum foil, which would appear to be very close to the temperature of the environment.
I was going to rant about how this thing is going to dazzle pedestrians, but fortunately, the video shows that it will mainly lighten up their legs. Wheelchair riders beware, though.
Anyway, the system as described uses thermal IR cameras. I'd say that technology is way too expensive even for high end cars. Thermographic cameras capable of around 200x150 pixels are commercially available for around 5 kEUR and I suspect that that resolution is still too low to recognize a pedestrian at 50 m distance and at the same time have a reasonably wide field of view. You can get 80x80-resolution systems for around 1 kEUR, but those will definitely be useless for the present purpose.
"no real attempt to move the launch platform up to 80,000 feet or so using gas balloon technology. I would have thought this would be feasible, and could result in a substantial fuel saving."
The fuel cost of a launch to low orbits is not for the altitude, but for gaining enough speed to stay in orbit, i.e. about 8 km/s. The gravitational energy becomes significant if you need altitudes comparable to the earth radius (6400 km).
It tried to RTFA, but it was in Japanese! I thought Japanese didn't have a word for "no":
Japanese also lacks words for yes and no. The words "hai" and "iie" are mistaken by English speakers for equivalents to yes and no, but they actually signify agreement or disagreement with the proposition put by the question: "That's right." or "That's not right.
studying an encryption scheme that is widely considered completely and irreparably broken?
All known issues with RC4 have to do with statistical biases in the first bytes of the key stream, in particular the first 256 bytes (this paper also mentions a significant bias at byte 258). As far as we know, all issues with RC4 are avoided in protocols that simply discard the first kilobyte of key stream before starting to apply the key stream on the plaintext. SSH does this (discarding the first 1.5 kiB IIRC). For WPA I can imagine that this workaround would have an unacceptable performance penalty on small data packets. For some reason, this approach was never implemented for TLS/HTTPS or WPA.
So why would one be interested in RC4? It's significantly faster than AES when run on processors that do not have hardware AES support. If I use scp and rsync-over-ssh to copy files to devices like a Raspberry Pi or my home server which runs on a low-power VIA processor, it's a big difference (aes versus arcfour), something like 4 MB/s versus 8 MB/s. Here are some benchmarks: openSSH cipher benchmarks.
I keep my eyes open for papers like this, in particular I check whether they make statements on weaknesses after the first kilobyte of key stream.
You're jumping to conclusions. There are perfectly legitimate reasons for that kind of mail volumes, such as administrering mail servers of a company that handles customer support tickets or a web shop with order confirmations, shipping notices, and invoices (3 emails per order). It could also be an opt-in mailing list.
Problem is that these photographers are still stuck in the 20th century, and will give you a printout.
They changed the photo business in the biggest attraction park in the Netherlands, quite recently. They used to charge EUR 10 or so for a single printout. Now they sell you a 4 GB USB stick for EUR 20 which you can load with up to 15 (?) photos and which you can re-use on a next visit until some expiration date. And afterwards, you can use it as any other USB stick. I thought it was pretty reasonable. It was the first time ever I paid for photos in an attraction park.
"I will agree that with the rate of technological change today, the current 20 year protection is ridiculous. Technologies are typically woefully outdated by the time patents expire. IMHO patents should last significantly less time than currently (say 5 years or so),"
A farmaceutical product can well take much longer than that between the time the compound was discovered and the time it has passed all clinical trials and gets approval.from the authorities.
I work in the high-tech industry, where it can easily take 5 years between the first conception and the actual sale of the product. Only for small, incremental changes of existing technology, we sometimes get below 2 years.
The patent system is broken IMO, but not because of the 20-year term. The threshold for patentability is way too low IMO. Every big player in the industry is aggressively patenting every little idea just because the others do the same and nobody wants to be bitten in the ass by a competitor's patent or a patent troll. (I am personally in a strange position,since my employer provides various incentives to generate IP, so I end up contributing to the systemic problem.)
The removal of the 'read more' link broke the Avantslash parser as well. But it's fixed now. And... Avantslash still shows a 'read more' link. I was reading m.slashdot.org from my phone over the last few days. Amazing how unusable it still is.
"The case in question is regarding defamatory comments posted to a site that the victim went to court over. The courts ordered that the content be taken down. The lazy assed website owners took SIX WEEKS to remove the content."
No. RTFJ(udgment), under the chapter "FACTS".
The comments were removed the day the complaint came in, at which time the comments had been online for 6 weeks. This happened in 2006, by the way. The website had a mechanism for users to flag comments; apparently the complaining party had not used that and demanded monetary compensation at the first contact.
The judgment is surprisingly legible, though rather long. Much better than the average EULA. I didnn't read past the description of initial events. I'm sure that it also explains why this particular website owner was held responsible.
While the owner is detecting the problem, isolating where it is on the fibre and sending out crews to fix it, the tap is applied in the second location, along with suitable repairs and whatnot.
I'd say that finding out where it is on the fiber is done by measuring the time it takes for a light pulse to reflect off the disturbance and converting that to distance. If the distances measured from both ends of the fiber do not add up to the length of the fiber, the owner of the fiber should get very suspicious. Would the eavesdropper take that risk?
According to a friend of mine who's into fiber optics, tapping a fiber can be done without interrupting the fiber. If you bend a single-mode fiber, it will leak light, which is relatively easy to capture. The resulting signal loss of a few dB is likely to go unnoticed.
"You cannot make encryption only weak for the "good" guys. It simply doesn't work that way and wishing will not make it otherwise"
The broken elliptic-curve random generator actually had such a feature: it was likely that the NSA has a secret key that could be used to recover the internal state of the random generator. However, recovering this secret key was impossible for all practical purposes.
For encryption, one could demand that encrypted data includes a header that contains the key to decrypt the data, that key being encrypted using a public key provided by the "good guys". Voila, the good guys can decrypt your data and the bad guys cannot.
Even if you are not very familiar with guns, you'd have to be pretty obtuse to mistake [a stormtrooper gun for a 9 mm gun]. If you can't tell the difference between them, then you probably wouldn't be able to distinguish a gun from a stick.
Of course, it's obvious to anyone that a stormtrooper gun is not a standard 9 mm gun. But that's not the point. The question is whether it's reasonable to assume that anyone would be able to tell in an instant that there exists no firearm that looks like a stormtrooper gun. I would surely be scared as hell if a stranger pointed that thing at me.
Here in the Netherlands, it's illegal to carry something in public that could reasonably be mistaken for an actual firearm. That's why toy guns here are invariably made of bright-colored plastic. I believe that this policy has prevented quite a few (fatal) misunderstandings.
"Feature request: manually set app permissions please."
From TFA: "You don't have to agree to permission that don't make sense to you. Now, apps will ask when you first start them which device functions they want access to. You can pick and choose on a per-app basis what is permissible."
Your EPA document is about sequestration rates PER TREE in (sub)urban setting. Under such circumstances, the CO2 sequestration rate would depend mostly on the amount of sunlight that it can capture, which increases as the tree grows. A typical urban tree looks like a short stick with a strongly branched green ball on top.
In a production forest, trees are planted closely together and compete with each other for light. You'd expect the photosynthesis rate per unit of ground area to level off once a full leaf coverage is reached, which could well happen within 20 years. My idea of a production forest is lots of tall stems with little branching, most leaves near the top, and not enough light to support plant growth at ground level.
Secondary effects could be that the trees waste more energy on forming new leaves every spring that capture a smaller and smaller fraction of the sunlight as the competition for light increases. That could well lead to a reduction in net sequestration rate over time.
To me it seems plausible that you're both correct, but comparing apples and oranges.
You speak about Ocean Spray in the present tense. From a quick Google it seems that this was happening around 1988 and that the company got in trouble for it.
"any home brewer can replicate the yeast with ease."
I wouldn't be so sure of that. If this yeast is slow to replicate compared to wild yeast strains that float around in the air, it may be quite difficult to keep your strain from getting outcompeted by other strains unless you have a cleanroom facility at home.
This Sheerwind Invelox sets off my BS meter as well. The Venturi effect (a special case of the Bernoulli principle) won't magically let you harvest more energy then what was already in the airflow. In a Venturi device, flow velocity increases temporarily in exchange for a pressure drop (to less than atmospheric pressuee). Downstream, the velocity lowers and the kinetic energy exchanged back into pressure, reaching atmospheric pressure. If you were able to harvest the kinetic energy, you would end up with a slow gas velocity and still subatmospheric pressure, which wouldn't be able to flow back into the atmosphere.
"Folks walk out into traffic staring at the samsung. Go 10 blocks in Manhattan, you will get at least a dozen of these folks. No spatial awareness at all."
If you're on foot, you can usually have pretty good spatial awareness of cars from your ears. Doesn't work well for bicycles and e-cars at low speed, though.
When I'm cycling abroad (I'm from Netherlands) on the countryside, it's weird how some car drivers seem to think that it's necessary to announce themselves by honking the horn even though I could already identify them as truck, passenger car, or agricultural vehicle before they were aware of me.
Telecom is hugely profitable, mobile telecom even more so.
Could you provide some data to support that statement? Not that I think the roaming charges are reasonable (since they are completely disconnected from actual costs for the operators), but that would just mean that domestic charges should go up and international/roaming rates should go down.
Look for example at the Vodafone annual report (big PDF), income statement on page 96. On 38 bn UK pounds annual revenue, the made 5 bn loss (before taxes, not including the profitable sale of their stake in Verizon).
Or the T-mobile US numbers on 2014 (full year). Page 6: US$ 14 bn revenue; net income US$ 0.25 bn. That does not look like a hugely profitable business to me. Or the balance sheet on page 5: US$ 57 bn assets, and only US$ 16 bn of stockholder's equity; a ratio of 3.6:1, which I'd consider pretty large for a company that is not making a large profit and that has to deal with rapidly depreciating infrastructure.
Here's Verizon 2014 full year: US$ 127 bn revenue, US$ 12 bn net income. That looks more healthy. But look at the balance sheet: US$ 232 bn assets, and just US$ 14bn in equity (16:1 ratio). I would be very hesitant to invest in a company with such a balance sheet. To my surprise, the stock market thinks differently with a P/E of 21.
I'm not a finance expert, so if I misinterpret the numbers, please correct me.
Slashdot Mirror
"miniscule compared to the toxic stuff released during the generation of the extra electricity required for the incandescent bulb."
That depends on the type of exhaust scrubbers fitted to the coal power plant and the type of coal used. I'd wager that technology exists and is actually being used to make the exhaust pretty much free of toxic stuff. The sulfur is converted to gypsum (used in drywall), the ashes are an additive to concrete, etc..
What cannot be suppressed is the (nontoxic) CO2 emission. It would be good to quantify things beyond "a lot" and "much more". Electricity can be converted to electricity to electricity at 1 to 2 kWh/kg depending on who you believe (can't be bothered to find out why different values exist). Assumie a CFK lasts 3000 h (actually they should last 6x longer, but it seems to be too optimistic for many use cases) and an incandescent 1000 h. A 60 W incandescent will use 180 kWh over 3000 h, i.e. 90 to 180 kg of coal. The CO2 emission is about 3.5 times that weight.
$200 for an 80x80 FLIR camera? Which model is that? I'm looking at the FLIR selection, but the only one that comes close is an IR plugin for an iPhone, 80x60 pixels. At a 9 Hz frame rate, I don't think that sensor would be suitable for analyzing road obstacles while driving, never mind the resolution.
That would sound plausible, except that the image that they show in the video clip (0:28) is a fairly high-resolution fully thermal image without blending with a visible-light image.
It's thermal infrared cameras. The color of the clothes doesn't matter. Except maybe if they cover themselves in aluminum foil, which would appear to be very close to the temperature of the environment.
I was going to rant about how this thing is going to dazzle pedestrians, but fortunately, the video shows that it will mainly lighten up their legs. Wheelchair riders beware, though.
Anyway, the system as described uses thermal IR cameras. I'd say that technology is way too expensive even for high end cars. Thermographic cameras capable of around 200x150 pixels are commercially available for around 5 kEUR and I suspect that that resolution is still too low to recognize a pedestrian at 50 m distance and at the same time have a reasonably wide field of view. You can get 80x80-resolution systems for around 1 kEUR, but those will definitely be useless for the present purpose.
"no real attempt to move the launch platform up to 80,000 feet or so using gas balloon technology. I would have thought this would be feasible, and could result in a substantial fuel saving."
The fuel cost of a launch to low orbits is not for the altitude, but for gaining enough speed to stay in orbit, i.e. about 8 km/s. The gravitational energy becomes significant if you need altitudes comparable to the earth radius (6400 km).
All known issues with RC4 have to do with statistical biases in the first bytes of the key stream, in particular the first 256 bytes (this paper also mentions a significant bias at byte 258). As far as we know, all issues with RC4 are avoided in protocols that simply discard the first kilobyte of key stream before starting to apply the key stream on the plaintext. SSH does this (discarding the first 1.5 kiB IIRC). For WPA I can imagine that this workaround would have an unacceptable performance penalty on small data packets. For some reason, this approach was never implemented for TLS/HTTPS or WPA.
So why would one be interested in RC4? It's significantly faster than AES when run on processors that do not have hardware AES support. If I use scp and rsync-over-ssh to copy files to devices like a Raspberry Pi or my home server which runs on a low-power VIA processor, it's a big difference (aes versus arcfour), something like 4 MB/s versus 8 MB/s. Here are some benchmarks: openSSH cipher benchmarks.
I keep my eyes open for papers like this, in particular I check whether they make statements on weaknesses after the first kilobyte of key stream.
"Congratulations, you're a spammer."
You're jumping to conclusions. There are perfectly legitimate reasons for that kind of mail volumes, such as administrering mail servers of a company that handles customer support tickets or a web shop with order confirmations, shipping notices, and invoices (3 emails per order). It could also be an opt-in mailing list.
They changed the photo business in the biggest attraction park in the Netherlands, quite recently. They used to charge EUR 10 or so for a single printout. Now they sell you a 4 GB USB stick for EUR 20 which you can load with up to 15 (?) photos and which you can re-use on a next visit until some expiration date. And afterwards, you can use it as any other USB stick. I thought it was pretty reasonable. It was the first time ever I paid for photos in an attraction park.
"I will agree that with the rate of technological change today, the current 20 year protection is ridiculous. Technologies are typically woefully outdated by the time patents expire. IMHO patents should last significantly less time than currently (say 5 years or so),"
A farmaceutical product can well take much longer than that between the time the compound was discovered and the time it has passed all clinical trials and gets approval.from the authorities.
I work in the high-tech industry, where it can easily take 5 years between the first conception and the actual sale of the product. Only for small, incremental changes of existing technology, we sometimes get below 2 years.
The patent system is broken IMO, but not because of the 20-year term. The threshold for patentability is way too low IMO. Every big player in the industry is aggressively patenting every little idea just because the others do the same and nobody wants to be bitten in the ass by a competitor's patent or a patent troll. (I am personally in a strange position,since my employer provides various incentives to generate IP, so I end up contributing to the systemic problem.)
The removal of the 'read more' link broke the Avantslash parser as well. But it's fixed now. And... Avantslash still shows a 'read more' link. I was reading m.slashdot.org from my phone over the last few days. Amazing how unusable it still is.
"The case in question is regarding defamatory comments posted to a site that the victim went to court over. The courts ordered that the content be taken down. The lazy assed website owners took SIX WEEKS to remove the content."
No. RTFJ(udgment), under the chapter "FACTS".
The comments were removed the day the complaint came in, at which time the comments had been online for 6 weeks. This happened in 2006, by the way. The website had a mechanism for users to flag comments; apparently the complaining party had not used that and demanded monetary compensation at the first contact.
The judgment is surprisingly legible, though rather long. Much better than the average EULA. I didnn't read past the description of initial events. I'm sure that it also explains why this particular website owner was held responsible.
I'd say that finding out where it is on the fiber is done by measuring the time it takes for a light pulse to reflect off the disturbance and converting that to distance. If the distances measured from both ends of the fiber do not add up to the length of the fiber, the owner of the fiber should get very suspicious. Would the eavesdropper take that risk?
According to a friend of mine who's into fiber optics, tapping a fiber can be done without interrupting the fiber. If you bend a single-mode fiber, it will leak light, which is relatively easy to capture. The resulting signal loss of a few dB is likely to go unnoticed.
"You cannot make encryption only weak for the "good" guys. It simply doesn't work that way and wishing will not make it otherwise"
The broken elliptic-curve random generator actually had such a feature: it was likely that the NSA has a secret key that could be used to recover the internal state of the random generator. However, recovering this secret key was impossible for all practical purposes.
For encryption, one could demand that encrypted data includes a header that contains the key to decrypt the data, that key being encrypted using a public key provided by the "good guys". Voila, the good guys can decrypt your data and the bad guys cannot.
Of course, it's obvious to anyone that a stormtrooper gun is not a standard 9 mm gun. But that's not the point. The question is whether it's reasonable to assume that anyone would be able to tell in an instant that there exists no firearm that looks like a stormtrooper gun. I would surely be scared as hell if a stranger pointed that thing at me.
Here in the Netherlands, it's illegal to carry something in public that could reasonably be mistaken for an actual firearm. That's why toy guns here are invariably made of bright-colored plastic. I believe that this policy has prevented quite a few (fatal) misunderstandings.
Oh wait, it was TFA of the next article on the front page... My bad.
"Feature request: manually set app permissions please."
From TFA: "You don't have to agree to permission that don't make sense to you. Now, apps will ask when you first start them which device functions they want access to. You can pick and choose on a per-app basis what is permissible."
It's about time...
Your EPA document is about sequestration rates PER TREE in (sub)urban setting. Under such circumstances, the CO2 sequestration rate would depend mostly on the amount of sunlight that it can capture, which increases as the tree grows. A typical urban tree looks like a short stick with a strongly branched green ball on top.
In a production forest, trees are planted closely together and compete with each other for light. You'd expect the photosynthesis rate per unit of ground area to level off once a full leaf coverage is reached, which could well happen within 20 years. My idea of a production forest is lots of tall stems with little branching, most leaves near the top, and not enough light to support plant growth at ground level.
Secondary effects could be that the trees waste more energy on forming new leaves every spring that capture a smaller and smaller fraction of the sunlight as the competition for light increases. That could well lead to a reduction in net sequestration rate over time.
To me it seems plausible that you're both correct, but comparing apples and oranges.
You speak about Ocean Spray in the present tense. From a quick Google it seems that this was happening around 1988 and that the company got in trouble for it.
"any home brewer can replicate the yeast with ease." I wouldn't be so sure of that. If this yeast is slow to replicate compared to wild yeast strains that float around in the air, it may be quite difficult to keep your strain from getting outcompeted by other strains unless you have a cleanroom facility at home.
This Sheerwind Invelox sets off my BS meter as well. The Venturi effect (a special case of the Bernoulli principle) won't magically let you harvest more energy then what was already in the airflow. In a Venturi device, flow velocity increases temporarily in exchange for a pressure drop (to less than atmospheric pressuee). Downstream, the velocity lowers and the kinetic energy exchanged back into pressure, reaching atmospheric pressure. If you were able to harvest the kinetic energy, you would end up with a slow gas velocity and still subatmospheric pressure, which wouldn't be able to flow back into the atmosphere.
This is also worth reading: http://www.gizmag.com/dodgy-wi...
"Folks walk out into traffic staring at the samsung. Go 10 blocks in Manhattan, you will get at least a dozen of these folks. No spatial awareness at all."
If you're on foot, you can usually have pretty good spatial awareness of cars from your ears. Doesn't work well for bicycles and e-cars at low speed, though.
When I'm cycling abroad (I'm from Netherlands) on the countryside, it's weird how some car drivers seem to think that it's necessary to announce themselves by honking the horn even though I could already identify them as truck, passenger car, or agricultural vehicle before they were aware of me.
"The study compared Neonicotinoids laced pollen to sugar water."
What are you talking about??
From the actual paper in Nature: "bees of both species prefer to eat more of sucrose solutions laced with IMD or TMX than sucrose alone."
http://www.nature.com/nature/j...
Could you provide some data to support that statement? Not that I think the roaming charges are reasonable (since they are completely disconnected from actual costs for the operators), but that would just mean that domestic charges should go up and international/roaming rates should go down.
Look for example at the Vodafone annual report (big PDF), income statement on page 96. On 38 bn UK pounds annual revenue, the made 5 bn loss (before taxes, not including the profitable sale of their stake in Verizon).
Or the T-mobile US numbers on 2014 (full year). Page 6: US$ 14 bn revenue; net income US$ 0.25 bn. That does not look like a hugely profitable business to me. Or the balance sheet on page 5: US$ 57 bn assets, and only US$ 16 bn of stockholder's equity; a ratio of 3.6:1, which I'd consider pretty large for a company that is not making a large profit and that has to deal with rapidly depreciating infrastructure.
Here's Verizon 2014 full year: US$ 127 bn revenue, US$ 12 bn net income. That looks more healthy. But look at the balance sheet: US$ 232 bn assets, and just US$ 14bn in equity (16:1 ratio). I would be very hesitant to invest in a company with such a balance sheet. To my surprise, the stock market thinks differently with a P/E of 21.
I'm not a finance expert, so if I misinterpret the numbers, please correct me.