I have an ozone vegetable washer. Is it dangerous to be in same room when this vegetable washer is running ? I can smell the odour of ozone near the vegetable washer
The odour detection threshold is 0.005-0.02 PPM. OSHA says less than 0.1 PPM over an 8-hour period.
So you can smell ozone well before it is in the harmful range. Some air circulation wouldn't hurt while the device operates, but napkin math says you are OK.
Can someone explained what happened recently to cause such aggressive action against Huawei with ARM , Google etc refusing to work with them. Is it related to arrest of their executive recently ?
It's part of the US/China trade war. Trump believed the existing tariff situation with China was unfair and wanted to negotiate a new trade deal. When negotiations failed he started to implement a bunch of tariffs and trade restrictions on chines goods and companies to try to force their hand. This is just a part of that 'negotiation' strategy.
Google, Arm etc. don't want to stop doing business with Huawei (since doing so no doubt costs them a lot of money), they're being banned from doing business with Huawei by the US government.
China has disallowed their citizens from using Google, Netflix, Instagram, but everyone's up in arms over Trump stopping the US from doing business with Huawei. I really don't understand this.
China only bans foreign companies in its domestic markets. Trump is dictating whom third parties can do business with. For example, European firms have to cut normal business ties with huawei, otherwise they will be sanctioned by the US. And the US isn't paying for the cost of breaking their contract with Huawei.
China is not competitive in tech right now, so it needs to block foreign companies in order to have local companies have a chance of emerging, and one day becoming competitive.
On the other hand, the US is super competitive. They must do as much business with China as possible in order to discourage any new company from spawning over there, because it would create competition.
In other words, Trump is doing exactly the opposite of what is good for the US.
I worked for a non-Google tech company and there is literally code which prevents users in any sanctioned countries from being able to use the services.
Unless Sundar Pichai would like to go to jail, there's very little that they can do about this.
I believe there is something called the legal system?
Which companies or people can use to challenge government decisions, if they don't like them. And they can at least openly express their concerns.
But I do not see that hapoening, so something (or quite a lot) is going on behind the scene.
They will fight in court and lose. What the US govt is doing is completely legal, no matter where you stand on the morality or sensibleness of these actions.
Trump is doing all this under the authority of national security. That is not a blank check, though, and there is an oversight mechanism that can be employed to determine if the authority is being used appropriately or not.
Unfortunately, that oversight mechanism lies with Congress, and given that the majority party currently in the Senate is taking the stance of "anything Trump does is right", we can't reasonably expect that the mechanism will actually be used in the next couple of years, at least.
Cause china is an authoritian government that hasn't been too nice to america business in recent years. Why would anyone stand up for them now that the illusion of market openness goes away? Google not even allowed in china so why fight on china behave very hard.
I rather talk standing up for free market.
In a free market system the government can't just order companys to stop doing buisness with someone unless very good reasons are provided. I don't see that with Huawei.
And china is Authorian?
Yeah, so is half the world. But it would be news to me, that only "democracies" are acceptable trade partners.
> This is just a part of that 'negotiation' strategy.
Your explanation doesn't answer the question why Huawei got picked. Huawei products got banned in the US way before the trade war, Huawei's exports to US is pretty small I'd say. It thus has really nothing to do with the existing tariff situation whatsoever.
On the other hand, there are many big Chinese companies exporting to the US in huge sheer volume, Lenovo is probably the best example here, interestingly, Lenovo never got treated in the same way. Why there is such huge difference?
The answer is plain and simple - Huawei managed to lead the 5G development and growing faster than anyone else. US refuses to accept that. Lenovo's business model is what US wants all Chinese companies to follow - focusing on low end craps, make money by working hard not working smart. Same goes to those crappy Chinese companies like Xiaomim OPPO, OnePlus.
Also after listening to "history of Rome" podcast and then re reading asterix it quite amazing how the authors have maintained historical accuracy in a children's comic
One show , I don't recall the name,asked people answer some question like what is distance between NY to LA. They could choose any range as the answer and the right answer had to fall in that range.So to win people just had to select huge range like 0 to 1 million miles and be sure they got the answer right .However people would mostly select a narrow range that they felt was the right answer and got it wrong frequently. I think it is some desire not to sound stupid even though there is a incentive to select a ridiculous range.I think this desire not to sound stupid could be at play here as well so people choose things that to them seems reasonable even when asked about their ideal life.
Does anyone know how NK is able to successfully fully develop Nuclear and missile tech inspite of sanctions. I believe many countries like Iran Iraq have been trying without success for many years
For nation-states, nuclear weapons are not hard to do, they are 1940's technology after all. Once a source of uranium is available, the only obstacles are international treaties and countries that enforce them. Iran and Iraq's geopolitical situation makes it less delicate to enforce.
Same with rockets. The technology is basically 1950's and they would also have plenty of samples from the 60's and 70's. These days there are plenty of examples of amateur teams sending things to space and even private companies can build better rockets than nation-states.
Also, to add, I think a lot of the perception that North Korea is technology backwards is thanks to propaganda which is often exaggerated. Having seen a computer science team from there speak about 15 years ago, I was quite impressed by their level and sophistication (it was a presentation about the kwangmyong network) https://en.m.wikipedia.org/wiki/Kwangmyong_(network) so I'm sure they have many other clever people in other branches that are competent to work on anything the state requires.
That deal had North Korea's weapons-grade production facilities shut down for eight years, despite US foot-dragging on our side (we'd agreed to supply reactors that were not suitable for weapons production, and then the GOP Congress refused to fund that).
So, what restarted weapons-grade plutonium production there? The George W. Bush administration effectively abrogated the deal, claiming that the DPRK had a separate active nuclear weapons program, based on evidence about as sketchy as what they provided to argue that Saddam Hussein had one. (He didn't.) The Yongbyon plutonium-production reactor was back in operation within a month.
Clinton's deal was imperfect, but it worked a whole lot better than get-tough shit from his Republican successor.
Bill Clinton's administration allowed NK to obtain nuclear weapons while supplying them with food and fuel. Their approach didn't work at all and is how we wound up in this state.
For the record not blaming the administration (Republican administration have done things equally or more stupid so not a partisan taking point, it's just they can't be excused for the dramatic failure on this because someone prefers Democrats). Likely it seemed the best course of action, they expected at least some compliance, but NK did not abide by it's agreements at all.
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NK also made commitments to Putin to suspend the ICBM program in exchange for aid which they also violated. So again, Clinton is not the only one burnt by them. But saying the Clinton administration's approach was a success is not right. It was very much an unsuccess.
The DPRK's first nuclear test was in 2006 --- six years after Clinton left office, and three years after Bush's temper tantrum led to the breakdown of Clinton's deal and the unsealing of the Yongbyon reactor. If you think it's revisionist to say Clinton couldn't have done much about North Korea years after leaving office, you have an odd way of defining that term.
Because they had been cheating on Uranium enrichment in the late 90's while receiving food and fuel aid.
There is plenty of blame to go around, the Bush administration certainly handled, well just about everything it came across, very badly, but saying the Clinton approach worked is just wrong. It didn't work, NK was cheating on the deal while being fed and fueled. Certainly we shouldn't go back to paying them extortion and bribes, that is not a good idea at all.
Does anyone have recommendation on a simple self contained primer to understand electronic circuits as shown in this article. Article is very interesting but am hampered by lack on ability to understand the circuit diagram.
I don't know if this is the answer you expect, but Radio Shack made a "200-in-1 electronic project lab" toy/kit that came with a book that has a really really good explanation on all of analog electronics. And you can try all the examples yourself. It is very fun.
An alternative is, read about the following:
1. Ohm's law -- the relationship between voltage, current, and resistance. And power.
2. Learn how to sum resistors in parallel vs resistors in series.
3. Learn about capacitors, how do they charge? (the RC constant). What happens afterwards?
4. Now learn about RC circuits (resistor+capacitor), which means you will learn about filters: low pass, high pass, at the very least. Know how to calculate the 'cutoff' frequency.
5. Learn about how a transistor works. First, how it can be made to work as a switch. Then, how it can be made to work as an amplifier.
6. Learn about the inductor (the "L" in L,R,C). Learn the relationship between inductors, capacitors and resistors.
7. Since now you know about inductors, you can also see Oscillator circuits using transistors.
ALTERNATIVELY
on step 5, instead of learning about transistors, learn about opamps. It is easier to understand than transistors!
Then learn about how to implement oscillators with opamps, filters with opamps.
Afterwards you may perhaps want to learn about digital circuits. If you understand boolean algebra or bit logic functions (and, or, xor, not), then this will be a piece of cake.
Thank you for the detailed steps. Based on your list I purchased "Teach yourself electricity and electronics" which has content similar to the order you have listed. Hopefully ramping up on the basics will enable understanding of circuit diagrams
Might want to add in a 4.5, learn about the diode.
And I also recommend learning about opamps instead of transistor amplifiers, easier and more practical. However the transistor as switch is still very useful to understand.
I'm trying to write an online electronics book, so your comment hits home for me! I'd like it to be "self contained," but that still assumes a moderate dose of prerequisite math and physics topics. Furthermore, "simple" it is not.
Could you take a quick look at the simulation I attached elsewhere in this discussion? Let me know if that simulation and the notes around it are helpful for your understanding.
Thank you for pointing to excellent resource like circuit labs.I was able to get a better understanding after running the simulation. Looking forward to your book
What I'd LOVE to see is a series/book called: "15 ways to make an LED blink" which explains all the ways you could accomplish this task. By this you should learn a lot about electronics.
You might want to just learn the physics of these things.
When you have any solid object, it's got a crystalline latice structure at the molecular level. Do you remember valence shell electrons from chemistry? They're the outermost shell. They are only tenuously connected to their atom and so it's easy to push them around, but the atom wants to be electrically neutral (#electrons = #protons)
In a conductor, let's say copper, you can shove on one end of the crystal with an electric field and induce a movement on those valence shell electrons that propagates your shove across the lattice. You could measure how much energy each electron gets from its shove, we'll call this Voltage. The rate of electric field moving through a particular surface area is called Current. In a perfect conductor, the voltage of the wave moving across the surface doesn't drop off. We can think of wires as being pretty good conductors, and in diagrams they exist as platonic perfect conductors. Also note that the amount of current in one end of the wire has to equal the current out or you would be losing or gaining a net electric charge.
So now you know the rules for a straight line in a diagram. The rest is learning how electric fields behave in other kinda of bulk materials. In the resistor, the voltage change across the entire resistor is proportional (linearly) to the flow of current through the resistor.
In a capacitor, we place two wide metal plates across from each other by a small distance. This doesn't form a complete connector - charges can't cross - but initially current flows in to charge the plates, then dies off as the voltage difference between the two opposing plates equalizes with the voltage applied to the capacitor. So these devices hold a charged electric field, and they allow high frequency changes in voltage to pass through, but low frequency is blocked by the charge saturation.
Inductors are similar to capacitors, but the energy is stored in a magnetic field. If you wind some wire into a coil, the magetic field from the wire acts as a sort of flywheel. These devices allow low frequencies to pass through.
Diodes are made out of crystalline solids called semiconductors, where a pure ingot of silicon (an insulator) is doped with a donor like Boron or Arsenic. Depending on whether the donor has fewer or more valence electrons than silicon, we get either a p type or an n type material. If we put a p type next to an n type, there's a thin band near the junction where the opposite types "cancel out" and no charge can pass. But if we apply a small voltage across the ends of the diode, the cancel out region shrinks thinner and thinner until eventually charge does pass through. So these are sort of like a one-way valve for circuits, and you need about 0.7V in the forward direction to get them going.
Thank you for the excellent summary. Based on your input and u/flavio81 response I have purchased a book on basic of electricity and that will hopefully enable me to understand and interpret circuit diagrams
I am a 2 year old.My brain thinks everyone in the world wants what I want.When I grab some other childs toy I dont understand why the child cries instead of being motivated and jumping with joy at having done what I want.
Apparently this startup ceo has not outgrown the terrible twos
