I've used D3O in some ski baselayers (Session) as well as bike armor/gloves (POC).
D3O is flexible, sure. It does not offer great penetration protection. It is more protective per volume than foam armor in terms of spreading a focused blunt impact out over an area. (D3O loves the ball peen hammer demonstration) However, D3O is not necessarily better than foam for energy absorption (absolutely inferior to foam by weight). Foam backed plastic plate is better at both spreading the force out and much better at absorbing impact forces, preventing penetration, and doing it while being lighter and cheaper.
What this means is that D3O excels where flexible protection is more important than penetration resistance and low profile is more important than weight savings. That makes D3O excellent for joint articulations: knuckles, palms, knees, elbows.
I don't understand the purpose of D3O in a helmet. To reduce concussions, you want to reduce axonal shear inside the skull. A shear thickening fluid would seem to be counterproductive for this purpose!
Can it detect irregular heart rhythms? YES... but probably with terrible specificity (false positive).
This device is a single lead EKG. It has potential to save lives... but it also potential to scare the bejezus out of a ton of folks and get them in for unneeded ER visits.
Anyone who has been in an ICU or telemetry unit can tell you the frequency that machines beep (often dozens of alarm initiations per patient PER HOUR). Nearly all the hospital alarms from vital monitoring systems (multi-lead EKG rates/rythmns/segmental DSP, oximetry, CO2, impedence, gas flow, etc) are either false or non-actionable even when properly configured to minimize alarms by using dozens of inputs, advanced multi-sensor fusion alarm suppression, noise filters, signal averaging, and DSP all on patients who are holding relatively still. Sometimes it feels like an ICU nurse's primary job is to instantly analyze 6+ continuous waveforms of multiple types and determine if there is yet another false positive alert.
Reasons to be skeptical about these authors and their methodology: they publishing the same claim over with changes in data but no explanation for why their numbers are changing. This article explains the physics as well as the reservations about the claim: https://www.quantamagazine.org...
There sure are some scary comparisons of doses and suggestions of risk without any references in the TFA.
The problem with many exposure limits and risk estimates is that they are all based on the worst case scenario, ultraconservative exposure model: linear no-threshold (LNT). Basically, this model we created in the 1940s assumes that all radiation is bad and more is worse in with a linear dose to risk relationship.
However, there is not much evidence to support this simplistic model, which is what NRC uses to establish dose limits! We've known it is wrong for a long time. There is evidence that other models, specifically radiation hormesis, are correct. We won't change anything policywise because imagine the gnashing of teeth from the Greens when the newspaper article reads "Government loosens radiation rules! FEAR!"
But radiation hormesis is supported by the evidence. It suggests that below a certain level, radiation stimulates cellular and DNA repair mechanisms so that there is an opitmal dose of radiation that is ABOVE zero and that only when you go high on a dose in a given time (threshold) does the damage outweigh the stimulated benefits, but the response may be nonlinear for dose vs risk after the threshold.
Here are just two of the more recent articles on the subject (research goes back a LONG time)
2009, "The Linear No-Threshold Relationship Is Inconsistent with Radiation Biologic and Experimental Data" Radiology http://www.ncbi.nlm.nih.gov/pm...
Other fun pieces of information: A chest X-ray is ~1.5mSv. An abdominal Cat Scan (CT) is usually 10-20mSv per study. Natural radiation exposure for Denver, CO (5280ft): 12mSv per year.
There are two problems here:
1. Deterrence through MAD (Mutually Assured Destruction) requires two rational actors interested in self preservation and a credible deterrent force for each. The USSR vs the USA met these definitions. The worry is that the the Iranian theocracy is not rational or revolution could result in even less rational leaders. Thus, the idea that Iranian nukes are unusable because the USA and Israel can deter Iran is a theory on shaky ground.
2. The inevitable nuclear arms race in an incredibly unstable region the crux of the problem. Iran is Persian and predominantly Shia. The Arabs are predominantly Sunni. Arabs and Persians have quite the rivalry. Sunnis and Shias hate each other. Iran and the Arab nations do not like each other. A nuclear Iran becomes a regional superpower and can intimidate and enforce its will in the region. Do the Arab states really believe the USA will nuke Tehran if the Iranians demand Yemen grant the Iranians whatever they happen to demand? The bottom line is that Arab states will need to get nukes or be subject to Iranian hegemey. Iran leads to a dozen more nuclear states, then the worry of problem #1 above magnify plus the possibility of a nuke being lost or going to terrorists increases exponentially.
A regional arms race was not a problem with North Korea. It is with Iran. A nuclear Iran drastically increases the chances of a mushroom cloud over some city in the following ten or twenty years.
You need some better understanding of the Japanese culture at the time. They wouldn't have surrendered to the USA to avoid the Soviets. They were not the Germans. The goal was to fight to the last and they didn't care which barbarian flag was going to fly after they all gloriously sacrificed themselves to the Emperor. Yes, they sent out peace feelers, but that is more than a little red herring as you present it. If you research the subject and discover what the Japanese had in mind as acceptable terms for a cessation of hostilities: there would be no occupation by foreign troops, the Japanese would keep some of their conquered territories, Japan would disarm itself. Even Gar Alperovitz admitted to this in his book that popularized the idea that we were primarily trying to intimidate the Soviets (this was merely an incidental bonus). The Japanese were NEVER going to agree to a surrender with an occupation and war crimes prosecutions as long as they figured they could bleed the Americans to their terms in a bloody protracted conflict.
Plenty of the leadership did not want to surrender even after two bombs; there was a coup attempt in order avoid the unconditional surrender.
The Allies would NEVER accept the Japanese idea of a conditional surrender. They (including the Soviets) committed to unconditional surrender because they knew 1. There must never be any doubt that the Japanese and Germans were TRULY beaten 2. It was necessary to completely reform the culture. Failure to accomplish these goals after WWI directly resulted in the mindset behind the Nazi rise to power in WWII. The Nazi party line was very much: "We were never really beaten in The Great War, but rather betrayed by Communists and Jewish traitors in our government. Germany should be resurgent and reclaim its honor." It is very easy to see a resurgent Japan had they been allowed conditional surrender.
I do not need permission to take notes in class. My handwriting is illegible and painfully slow. If not for laptops, I would be back to middle school where I sat and listened rather that flail at note-taking, only to be criticized by my teachers for not taking notes. While schools might consider the availability of unrestricted WiFi in the classroom, I frequently learn more by being able to research a topic on the web as the teacher lectures. That said, no student has the right to disrupt others.
Paved is a somewhat lenient definition of Evans.
A more accurate description would be: At some point asphalt was poured directly on the tundra and scree which has since eroded and subsided.
Many of the draconian provisions in EULA's viewed after purchase of software would be unenforceable for similar reasons. It's simply a case of the power not being abused by the software companies so nobody has had standing or need to sue yet.
[blockquote]So all you have to do is rob people there, since nobody around here is fool enough to intervene and get jailed or killed, and there's no chance of a conviction (or even police attention) without video evidence. If you have video evidence, and there is a history of crime, and someone gets hurt, then in the end, you can get a custodial sentence passed. It's an uphill struggle, though, because there's a hell of a lot of civil liberties in the way.[/blockquote]
Perhaps it is other civil liberties that have been taken away that are contributing to the problem? The English system legally prevents citizens from defending themselves with guns, or knives... or anything at all much less coming to the aid of others. The criminals know this and all they see walking around the streets are LEGALLY MANDATED VICTIMS. Is it a wonder that they rob with impunity?
We, the West, needed the Cold War to remind us of what was soulless and wrong with communist surveilance society police states. Now that the USSR has fallen, we have lost our perspective and are becoming what we used to despise.
Since not all of us live in California, how are these batteries going to perform in -20F? Did my vehicle range just drop to 10mi? That would kill the marketability of theh e-car. A lot of this country sees cold temperatures but the people will still expect their cars to work.
Although the description of the procedures sounds like something beyond what most medical directors would allow their paramedics to do (military combat medicine routinely involves procedures that civilian EMS cannot perform) and more like something that a doctor would do at a combat field hospital to stabilize for transfer to tertiary care (if I got the military parlance right)... or in civilianese, it is something that a doctor would do at a Level V, IV, or III trauma center to stabilize the patient for transport to a Level II or Level I trauma center
Ditto... if I am trying to perform business over my phone on my company website at the fringe of signal range on 1xRTT getting maybe 33.6kbps and I start getting verizon injected ads over my company website sucking up my barely there bandwidth, I'll drop Verizon in an instant and I've been with them since 2000. I pay the extra $60/month for unlimited data and PAM for business, not for playing around looking at ads.
What is next? Forcibly injected ads on your PC when using Verizon PCCARD or using Phone-As-Modem??? OTOH if verizon wants text ads on verizon run sites, I could care less though with max res of 320x200 there is barely room for content much less ads. Why don't we have 640x480 windows mobile yet? C'mon... at least 512x384 or 400x300 (I feel like I'm setting resolutions for DOOM II).
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I've used D3O in some ski baselayers (Session) as well as bike armor/gloves (POC).
D3O is flexible, sure. It does not offer great penetration protection.
It is more protective per volume than foam armor in terms of spreading a focused blunt impact out over an area. (D3O loves the ball peen hammer demonstration)
However, D3O is not necessarily better than foam for energy absorption (absolutely inferior to foam by weight).
Foam backed plastic plate is better at both spreading the force out and much better at absorbing impact forces, preventing penetration, and doing it while being lighter and cheaper.
What this means is that D3O excels where flexible protection is more important than penetration resistance and low profile is more important than weight savings. That makes D3O excellent for joint articulations: knuckles, palms, knees, elbows.
I don't understand the purpose of D3O in a helmet. To reduce concussions, you want to reduce axonal shear inside the skull. A shear thickening fluid would seem to be counterproductive for this purpose!
Can it detect irregular heart rhythms? YES... but probably with terrible specificity (false positive).
This device is a single lead EKG. It has potential to save lives... but it also potential to scare the bejezus out of a ton of folks and get them in for unneeded ER visits.
Anyone who has been in an ICU or telemetry unit can tell you the frequency that machines beep (often dozens of alarm initiations per patient PER HOUR). Nearly all the hospital alarms from vital monitoring systems (multi-lead EKG rates/rythmns/segmental DSP, oximetry, CO2, impedence, gas flow, etc) are either false or non-actionable even when properly configured to minimize alarms by using dozens of inputs, advanced multi-sensor fusion alarm suppression, noise filters, signal averaging, and DSP all on patients who are holding relatively still. Sometimes it feels like an ICU nurse's primary job is to instantly analyze 6+ continuous waveforms of multiple types and determine if there is yet another false positive alert.
Reasons to be skeptical about these authors and their methodology: they publishing the same claim over with changes in data but no explanation for why their numbers are changing. This article explains the physics as well as the reservations about the claim: https://www.quantamagazine.org...
There sure are some scary comparisons of doses and suggestions of risk without any references in the TFA.
The problem with many exposure limits and risk estimates is that they are all based on the worst case scenario, ultraconservative exposure model: linear no-threshold (LNT). Basically, this model we created in the 1940s assumes that all radiation is bad and more is worse in with a linear dose to risk relationship.
However, there is not much evidence to support this simplistic model, which is what NRC uses to establish dose limits! We've known it is wrong for a long time. There is evidence that other models, specifically radiation hormesis, are correct. We won't change anything policywise because imagine the gnashing of teeth from the Greens when the newspaper article reads "Government loosens radiation rules! FEAR!"
But radiation hormesis is supported by the evidence. It suggests that below a certain level, radiation stimulates cellular and DNA repair mechanisms so that there is an opitmal dose of radiation that is ABOVE zero and that only when you go high on a dose in a given time (threshold) does the damage outweigh the stimulated benefits, but the response may be nonlinear for dose vs risk after the threshold.
Here are just two of the more recent articles on the subject (research goes back a LONG time)
2009, "The Linear No-Threshold Relationship Is Inconsistent with Radiation Biologic and Experimental Data" Radiology
http://www.ncbi.nlm.nih.gov/pm...
2013, "Linear No-Threshold Model VS. Radiation Hormesis"
http://www.ncbi.nlm.nih.gov/pm...
Other fun pieces of information:
A chest X-ray is ~1.5mSv.
An abdominal Cat Scan (CT) is usually 10-20mSv per study.
Natural radiation exposure for Denver, CO (5280ft): 12mSv per year.
Loud noises do not cause avalanches. That is an urban myth. Source: I am an avalanche safety instructor and an avalanche rescue team leader.
There are two problems here: 1. Deterrence through MAD (Mutually Assured Destruction) requires two rational actors interested in self preservation and a credible deterrent force for each. The USSR vs the USA met these definitions. The worry is that the the Iranian theocracy is not rational or revolution could result in even less rational leaders. Thus, the idea that Iranian nukes are unusable because the USA and Israel can deter Iran is a theory on shaky ground. 2. The inevitable nuclear arms race in an incredibly unstable region the crux of the problem. Iran is Persian and predominantly Shia. The Arabs are predominantly Sunni. Arabs and Persians have quite the rivalry. Sunnis and Shias hate each other. Iran and the Arab nations do not like each other. A nuclear Iran becomes a regional superpower and can intimidate and enforce its will in the region. Do the Arab states really believe the USA will nuke Tehran if the Iranians demand Yemen grant the Iranians whatever they happen to demand? The bottom line is that Arab states will need to get nukes or be subject to Iranian hegemey. Iran leads to a dozen more nuclear states, then the worry of problem #1 above magnify plus the possibility of a nuke being lost or going to terrorists increases exponentially. A regional arms race was not a problem with North Korea. It is with Iran. A nuclear Iran drastically increases the chances of a mushroom cloud over some city in the following ten or twenty years.
You need some better understanding of the Japanese culture at the time. They wouldn't have surrendered to the USA to avoid the Soviets. They were not the Germans. The goal was to fight to the last and they didn't care which barbarian flag was going to fly after they all gloriously sacrificed themselves to the Emperor. Yes, they sent out peace feelers, but that is more than a little red herring as you present it. If you research the subject and discover what the Japanese had in mind as acceptable terms for a cessation of hostilities: there would be no occupation by foreign troops, the Japanese would keep some of their conquered territories, Japan would disarm itself. Even Gar Alperovitz admitted to this in his book that popularized the idea that we were primarily trying to intimidate the Soviets (this was merely an incidental bonus). The Japanese were NEVER going to agree to a surrender with an occupation and war crimes prosecutions as long as they figured they could bleed the Americans to their terms in a bloody protracted conflict. Plenty of the leadership did not want to surrender even after two bombs; there was a coup attempt in order avoid the unconditional surrender. The Allies would NEVER accept the Japanese idea of a conditional surrender. They (including the Soviets) committed to unconditional surrender because they knew 1. There must never be any doubt that the Japanese and Germans were TRULY beaten 2. It was necessary to completely reform the culture. Failure to accomplish these goals after WWI directly resulted in the mindset behind the Nazi rise to power in WWII. The Nazi party line was very much: "We were never really beaten in The Great War, but rather betrayed by Communists and Jewish traitors in our government. Germany should be resurgent and reclaim its honor." It is very easy to see a resurgent Japan had they been allowed conditional surrender.
I do not need permission to take notes in class. My handwriting is illegible and painfully slow. If not for laptops, I would be back to middle school where I sat and listened rather that flail at note-taking, only to be criticized by my teachers for not taking notes. While schools might consider the availability of unrestricted WiFi in the classroom, I frequently learn more by being able to research a topic on the web as the teacher lectures. That said, no student has the right to disrupt others.
I guess its a case of drifting on dirt vs very uneven and undulating surface with dips and potholes. Which is the bigger challenge to the robot car?
Paved is a somewhat lenient definition of Evans. A more accurate description would be: At some point asphalt was poured directly on the tundra and scree which has since eroded and subsided.
Mount Evans Road would be more challenging...
Many of the draconian provisions in EULA's viewed after purchase of software would be unenforceable for similar reasons. It's simply a case of the power not being abused by the software companies so nobody has had standing or need to sue yet.
[blockquote]So all you have to do is rob people there, since nobody around here is fool enough to intervene and get jailed or killed, and there's no chance of a conviction (or even police attention) without video evidence. If you have video evidence, and there is a history of crime, and someone gets hurt, then in the end, you can get a custodial sentence passed. It's an uphill struggle, though, because there's a hell of a lot of civil liberties in the way.[/blockquote] Perhaps it is other civil liberties that have been taken away that are contributing to the problem? The English system legally prevents citizens from defending themselves with guns, or knives... or anything at all much less coming to the aid of others. The criminals know this and all they see walking around the streets are LEGALLY MANDATED VICTIMS. Is it a wonder that they rob with impunity?
What if a monopoly made a product and nobody bought it?
We, the West, needed the Cold War to remind us of what was soulless and wrong with communist surveilance society police states. Now that the USSR has fallen, we have lost our perspective and are becoming what we used to despise.
Since not all of us live in California, how are these batteries going to perform in -20F? Did my vehicle range just drop to 10mi? That would kill the marketability of theh e-car. A lot of this country sees cold temperatures but the people will still expect their cars to work.
Although the description of the procedures sounds like something beyond what most medical directors would allow their paramedics to do (military combat medicine routinely involves procedures that civilian EMS cannot perform) and more like something that a doctor would do at a combat field hospital to stabilize for transfer to tertiary care (if I got the military parlance right)... or in civilianese, it is something that a doctor would do at a Level V, IV, or III trauma center to stabilize the patient for transport to a Level II or Level I trauma center
Actually, a great number of Iraqi casualties are treated by US forces.
Ditto... if I am trying to perform business over my phone on my company website at the fringe of signal range on 1xRTT getting maybe 33.6kbps and I start getting verizon injected ads over my company website sucking up my barely there bandwidth, I'll drop Verizon in an instant and I've been with them since 2000. I pay the extra $60/month for unlimited data and PAM for business, not for playing around looking at ads.
What is next? Forcibly injected ads on your PC when using Verizon PCCARD or using Phone-As-Modem??? OTOH if verizon wants text ads on verizon run sites, I could care less though with max res of 320x200 there is barely room for content much less ads. Why don't we have 640x480 windows mobile yet? C'mon... at least 512x384 or 400x300 (I feel like I'm setting resolutions for DOOM II).