I worked with a chemist 15 years ago to develop such a product. A professor had found a salt, Fast Blue B, would change color specific to THC. We were charged with trying to commercialize this, BUT, we couldn't prove that blood ratio had anything to do with breath concentration.
Breathalyzers for Alcohol are calibrated with an inferred ratio of 2100:1, of blood/breath concentration ratio. This is usually a fairly accurate assumption. The alcohol molecule is very volatile. THC on the other hand is a very different beast. If someone has smoked Marijuana, what you are reading is the residue on the lining of the airways which has a very poor correlation to what is in their blood.
This alone was enough to kill the idea, because ingesting vs smoking would give wildly different results.
Great Post: The USA has allowed capitalists to subvert government to impoverish its people... but look at northern Europe: highly socialist while allowing capitalism and I think a much more mature society than the USA. Even in Australia, we are much more socialized than the USA, and yes I hate the high taxes, but it provides a much better safety net for the poor.
Yeah, but it's never really been about the reliability. It's always been the "not paying your own IT maintenance staff" thing that's the big draw.
I priced 10 2core VMs. It was 24k/annum. We do that internally on an R720 that cost 10k and needs about 3 hours a month maintenance. So for mainly internal use networks, where is the value?
AC is correct. Most forms of subharmonic oscillation are caused by slope compensation issues, but pole filtering can also be an issue . For those who want the nitty gritty details, see this. http://www.ti.com/lit/ml/slup2...
I've designed lots of these little switch mode supplies. (SMPSs) The noise comes from the inductors. Inductors are coils of wire around a ferrite. When the current changes through the wire, the wire physically expands and contacts from every other wire. This is the source of the noise. (SMPSs normally switch from 200kHz to 2MHz, so well outside our audio range) There are a few things a designer can do. 1. Encapsulate the coil. This holds the wire tighter together and can minimise noise, but is only usually used in large inductors like those in invertors for UPSs or solar. 2. Eliminate subsonic oscillation with good multi-pole compensation. Switch mode power supplies have, have first second and third order responses which require filters to damp them. If you don't design these filters well, you can get subsonic oscillation which falls into the audio band. The power supply still regulates OK, but you can get that annoying whine. 3. Occasionally the noise can also come from a periodic load with that falls into an audio range. More capacitors on the output can help that.
Also, very very occasionally, it can come from ceramic capacitors that use a high k dielectric that are microphonic, but in my experience it is usually the capacitor acting as a microphone that upsets the circuit.
It describes Supercapitalism. Look it up on amazon and read the first review which summarises the concept well. Companies exists to provide the best value both shareholders and customers which deflates real wages. They play by the rules governments set, so it is up to governments to legislate the social outcomes they expect.
Have a look at the talk page. Regardless of what you think of the subject, the article is clearly biased. Read the thread under ''What about these studies then ?''
I'm encouraging my engineers to refer to GPS as GNSS, as there are 3 other systems Glosnass, the Russian system which is now operating. BeiDou the Chinese system also operational. And Galileo, the EU system which has had all sorts of delays.
Or it could be church goers on the whole have a better attitude to marriage. Like 1cor13, exposing the selfless virtues of love, and the many endorsements of sticking with the partner you have chosen.
That's an American problem. GSM was sparingly rolled out in the US due to the prevalence of CDMA, so reclamation of those frequencies is manageable. There are no such plans for the rest of the world, where there are hundreds of millions of GSM devices still in use.
Australia is shutting down it's 2G networks to make room for LTE.
I've been researching M2M for new products we have been developing.
The main players are Telit (HE910 sereis), Italy Sierra Wireless (HL6528/HL8548), Canadian Quectel (UC20), Chinese Gemalto EHS6, French U-Blox (Lisa and Sara), Swiss
I'm not sure if there is even a USA company that plays in this space. All the modules are of similar sie but have incompatible footprints.
Essentially, these modules will embed a Broadcom SOC and a custom OS. Broadcom was charging the module makers too much, so they have started moving to Intel and others. These product cost mega bucks to develop, and even after you buy a module with all the R&D done, you still need to spend a another $60k in certification if you want to get it on the AT&T network (per product).
There is going to be a lot of growth in this area as people develop IoT gateways. (as we are doing)
It's still modulation, modulation creates sidebands, and sidebands require bandwidth.
Nothing has changed, the Shannon–Hartley theorem still rules.
It's not modulation, it's multiplexing using a constant angular momentum. Modulation requires a change in something. With this case the they are sending seperate radio streams using different but constant rotated angluar momentums. Think of it like 3D glasses in movie cinema that use right and left hand polarised light.
In OZ, the carriers block at the IMEI level, so if a phone is stolen you can't use it in Australia (unless you can change the IMEI to one that the carriers recognise as valid) http://www.lost.amta.org.au/
One reason I turfed my backyard with artificial turf. I was sick of weeds, animals digging in it, mowing it, fertilizing it, the kids trampoline killing it.
Synthetic grass can now look as good as the real deal. It can get hot in summer, but otherwise its nice having an always perfect looking lawn.
NO mine wants a tailings dam to collapse. There are regular conferences on how to design the things and specialists who design them. NO CEO wants this to happen, because the cost reparations is horrendous, and contrary to what the comments have been like here, the bosses of these companies (well the ones I've know of) want to be good corporate citizens. Mining has risks, and incidents like this will ne analysed and fed back into the future design models, and like all things in life, will improve over time.
Have never like tek scopes that much, or Agilent. In fact my fav. Scopes are Yokogawa DLM series. All the manufacturers do the cripple thing though. If you want free I2C or LIN or CAN or USB or UART, buy a PC scope like a CleverScope.
To add to what you said. Australians now pay about 25c/kwh compared with 12c/kwh 10 years ago. The overinvestment in wires and poles was due to stupid legislation that GAURUNTEED a 10% return on any capital investment. (Gee lets spend a billion so we gaurunteed to make $100M) We put 40kwh of solar in at our business that with the current subsidies nets us 18% return on capital (vs 2% cash in the back)
Slashdot Mirror
I worked with a chemist 15 years ago to develop such a product. A professor had found a salt, Fast Blue B, would change color specific to THC.
We were charged with trying to commercialize this, BUT, we couldn't prove that blood ratio had anything to do with breath concentration.
Breathalyzers for Alcohol are calibrated with an inferred ratio of 2100:1, of blood/breath concentration ratio. This is usually a fairly accurate assumption. The alcohol molecule is very volatile. THC on the other hand is a very different beast. If someone has smoked Marijuana, what you are reading is the residue on the lining of the airways which has a very poor correlation to what is in their blood.
This alone was enough to kill the idea, because ingesting vs smoking would give wildly different results.
I'd be interested to see if this has an impact on tinnitus, which for most people who suffer it, is like audio neuropathic pain.
Great Post:
The USA has allowed capitalists to subvert government to impoverish its people... but look at northern Europe: highly socialist while allowing capitalism and I think a much more mature society than the USA.
Even in Australia, we are much more socialized than the USA, and yes I hate the high taxes, but it provides a much better safety net for the poor.
Yeah, but it's never really been about the reliability. It's always been the "not paying your own IT maintenance staff" thing that's the big draw.
I priced 10 2core VMs. It was 24k/annum. We do that internally on an R720 that cost 10k and needs about 3 hours a month maintenance. So for mainly internal use networks, where is the value?
Cheaper? /annum. We do that on r720 that cost $10k and a couple of hours a month maintainance.
10 x 2core vms is $20k
AC is correct. Most forms of subharmonic oscillation are caused by slope compensation issues, but pole filtering can also be an issue . For those who want the nitty gritty details, see this. http://www.ti.com/lit/ml/slup2...
I've designed lots of these little switch mode supplies. (SMPSs)
The noise comes from the inductors. Inductors are coils of wire around a ferrite. When the current changes through the wire, the wire physically expands and contacts from every other wire. This is the source of the noise. (SMPSs normally switch from 200kHz to 2MHz, so well outside our audio range)
There are a few things a designer can do.
1. Encapsulate the coil. This holds the wire tighter together and can minimise noise, but is only usually used in large inductors like those in invertors for UPSs or solar.
2. Eliminate subsonic oscillation with good multi-pole compensation. Switch mode power supplies have, have first second and third order responses which require filters to damp them. If you don't design these filters well, you can get subsonic oscillation which falls into the audio band. The power supply still regulates OK, but you can get that annoying whine.
3. Occasionally the noise can also come from a periodic load with that falls into an audio range. More capacitors on the output can help that.
Also, very very occasionally, it can come from ceramic capacitors that use a high k dielectric that are microphonic, but in my experience it is usually the capacitor acting as a microphone that upsets the circuit.
It describes Supercapitalism. Look it up on amazon and read the first review which summarises the concept well. Companies exists to provide the best value both shareholders and customers which deflates real wages. They play by the rules governments set, so it is up to governments to legislate the social outcomes they expect.
http://en.wikipedia.org/wiki/B...
Have a look at the talk page.
Regardless of what you think of the subject, the article is clearly biased. Read the thread under ''What about these studies then ?''
HaHa... Modded Insightful!!
I'm encouraging my engineers to refer to GPS as GNSS, as there are 3 other systems
Glosnass, the Russian system which is now operating.
BeiDou the Chinese system also operational.
And Galileo, the EU system which has had all sorts of delays.
Yet it still the only browser that does side tabs properly with treetab plugin, which is why it still my primary browser.
What a gift to the NSA!
Or it could be church goers on the whole have a better attitude to marriage. Like 1cor13, exposing the selfless virtues of love, and the many endorsements of sticking with the partner you have chosen.
I switch to alum crystal type deoderant years ago.
http://www.bodycrystal.com.au/...
They work well and last about 2 years per stick.
That's an American problem. GSM was sparingly rolled out in the US due to the prevalence of CDMA, so reclamation of those frequencies is manageable. There are no such plans for the rest of the world, where there are hundreds of millions of GSM devices still in use.
Australia is shutting down it's 2G networks to make room for LTE.
I've been researching M2M for new products we have been developing.
The main players are
Telit (HE910 sereis), Italy
Sierra Wireless (HL6528/HL8548), Canadian
Quectel (UC20), Chinese
Gemalto EHS6, French
U-Blox (Lisa and Sara), Swiss
I'm not sure if there is even a USA company that plays in this space.
All the modules are of similar sie but have incompatible footprints.
Essentially, these modules will embed a Broadcom SOC and a custom OS. Broadcom was charging the module makers too much, so they have started moving to Intel and others. These product cost mega bucks to develop, and even after you buy a module with all the R&D done, you still need to spend a another $60k in certification if you want to get it on the AT&T network (per product).
There is going to be a lot of growth in this area as people develop IoT gateways. (as we are doing)
It's still modulation, modulation creates sidebands, and sidebands require bandwidth.
Nothing has changed, the Shannon–Hartley theorem still rules.
It's not modulation, it's multiplexing using a constant angular momentum. Modulation requires a change in something. With this case the they are sending seperate radio streams using different but constant rotated angluar momentums.
Think of it like 3D glasses in movie cinema that use right and left hand polarised light.
Got to agree. We use a cyberoam appliance and ssl VPN. Does all firewall and av duties as well as VPN.
In OZ, the carriers block at the IMEI level, so if a phone is stolen you can't use it in Australia (unless you can change the IMEI to one that the carriers recognise as valid)
http://www.lost.amta.org.au/
Why doen't the USA do this as a sterting point?
One reason I turfed my backyard with artificial turf.
I was sick of weeds, animals digging in it, mowing it, fertilizing it, the kids trampoline killing it.
Synthetic grass can now look as good as the real deal. It can get hot in summer, but otherwise its nice having an always perfect looking lawn.
NO mine wants a tailings dam to collapse. There are regular conferences on how to design the things and specialists who design them. NO CEO wants this to happen, because the cost reparations is horrendous, and contrary to what the comments have been like here, the bosses of these companies (well the ones I've know of) want to be good corporate citizens.
Mining has risks, and incidents like this will ne analysed and fed back into the future design models, and like all things in life, will improve over time.
We use it for GUI interface in industrial controllers.
Have never like tek scopes that much, or Agilent. In fact my fav. Scopes are Yokogawa DLM series.
All the manufacturers do the cripple thing though. If you want free I2C or LIN or CAN or USB or UART, buy a PC scope like a CleverScope.
To add to what you said.
Australians now pay about 25c/kwh compared with 12c/kwh 10 years ago.
The overinvestment in wires and poles was due to stupid legislation that GAURUNTEED a 10% return on any capital investment. (Gee lets spend a billion so we gaurunteed to make $100M)
We put 40kwh of solar in at our business that with the current subsidies nets us 18% return on capital (vs 2% cash in the back)