Search found 422 matches

by lorb
Thu Aug 25, 2016 12:22 pm UTC
Forum: Serious Business
Topic: Should We Try Solar Radiation Management?
Replies: 89
Views: 14525

Re: Should We Try Solar Radiation Management?

The point is. Compared to that plan, solar radiation management (SRM) with aerosols looks really easy, cheap and sane. Instead what we should be looking for is something that is doable in a timeframe of less than 10 years, is more cost-effective than SRM and has less risk attached. Or really do rele...
by lorb
Thu Aug 25, 2016 11:25 am UTC
Forum: Serious Business
Topic: Should We Try Solar Radiation Management?
Replies: 89
Views: 14525

Re: Should We Try Solar Radiation Management?

Besides that it would simply take way too long. Building the 3 gorges dam took 10 years. The new WTC complex is still not yet finished and won't be until about 2021. And those construction projects are extremely simple and tiny in comparison to anything that is big enough to cast a huge shadow on ea...
by lorb
Thu Aug 25, 2016 9:51 am UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Goahead52's Math Posts

Can you factor this number Goahead? I think if you can, everyone will agree you are brilliant mathematician. If you can't I think its fair to say you are an imposter. 1796949159794106673291612844957324615636756180801260007088891883553172646034149093349337224786865075523085586419992922181443668472287...
by lorb
Tue Aug 23, 2016 2:06 pm UTC
Forum: Mathematics
Topic: How to Calculate Pi without a Calculator?
Replies: 66
Views: 8865

Re: How to Calculate Pi without a Calculator?

True! It's also next to nothing compared to how many digits of pi are already known.
by lorb
Tue Aug 23, 2016 10:00 am UTC
Forum: Coding
Topic: Is Scrapy overkill for this kind of task?
Replies: 4
Views: 3251

Re: Is Scrapy overkill for this kind of task?

Scrapy is pretty much exactly the right tool for this. Use scrapy-cloud and they also deal with avoiding the blacklisting for you, if what you do is legal/sane. If you really need to scrape so many URLs that concurrency is unavoidable and a concern they deal with that too, but you will have to get o...
by lorb
Tue Aug 23, 2016 6:09 am UTC
Forum: Mathematics
Topic: How to Calculate Pi without a Calculator?
Replies: 66
Views: 8865

Re: How to Calculate Pi without a Calculator?

[...] none of the ways for calculating pi by hand are going to get you very far. Depending on what you define as "very far". William Shanks did 707 digits by hand. (Though he made an arithmetic error and his digits are only correct for the first 527) Those 707 (or 527) I would consider pr...
by lorb
Mon Aug 22, 2016 4:04 pm UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Factorization of odd semi prime is over!

Goahead52 wrote:Any equation is an identity except you need to isolate some variables to make it solvable.


No it's not. Identity is a mathematical term that means:
An identity is a statement resembling an equation which is true for all possible values of the variable(s) it contains.
by lorb
Mon Aug 22, 2016 3:29 pm UTC
Forum: Science
Topic: Alternate clock
Replies: 31
Views: 4200

Re: Alternate clock

At any rate, almost everything mentioned in this thread has been proposed before Yeah. Everyone agrees the modern calender has many weaknesses and there is no shortness of ideas to correct them. What there is a shortness of is ideas how to overcome the heavy cultural entrenchment of it. Every calen...
by lorb
Mon Aug 22, 2016 8:40 am UTC
Forum: News & Articles
Topic: The Darker Side of the News
Replies: 3137
Views: 369380

Re: The Darker Side of the News

No you misunderstood, I'm talking about when very invasive photos are taken. Like when some paparazzi took topless photos of Kate Middleton in her garden by climbing a ladder they put against the fence (if my memory is correct), stuff like that where any normal person would get arrested and given a...
by lorb
Mon Aug 22, 2016 7:50 am UTC
Forum: Science
Topic: Alternate clock
Replies: 31
Views: 4200

Re: Alternate clock

One could also, at least in theory, make ten months that are 36.5 days long. The switch between months would than alter between midnight and midday. Just make sure that you put the half day at the beginning of those months that start at midday, maybe call the whole day "day 37 of month n" ...
by lorb
Mon Aug 22, 2016 3:15 am UTC
Forum: Science
Topic: Alternate clock
Replies: 31
Views: 4200

Re: Alternate clock

Why do we need months even? Can't we just number the days? Compare these: How many days are between March21 and May3? How many days are between 80 and 123 ? All such calculations become much easier, and I don't see much lost? People can still tell what general season it is from the number. Also you...
by lorb
Sun Aug 21, 2016 7:19 pm UTC
Forum: Science
Topic: Alternate clock
Replies: 31
Views: 4200

Re: Alternate clock

Also you get rid of the different ways that Americans and the rest of the world order days and months when writing down a date. 21.3.2016 and 03/21/2016 will both be just 80/2016 (Day-of-year date numbering, also week-of-year+day is a thing in some fields, already, like field-sciences and accountan...
by lorb
Sun Aug 21, 2016 3:59 pm UTC
Forum: Science
Topic: Alternate clock
Replies: 31
Views: 4200

Re: Alternate clock

Why do we need months even? Can't we just number the days? Compare these: How many days are between March21 and May3? How many days are between 80 and 123 ? All such calculations become much easier, and I don't see much lost? People can still tell what general season it is from the number. Also you ...
by lorb
Sat Aug 20, 2016 5:55 pm UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Factorization of odd semi prime is over!

by lorb
Sat Aug 20, 2016 7:27 am UTC
Forum: Mathematics
Topic: Please help, crazy example :-(
Replies: 9
Views: 2307

Re: Please help, crazy example :-(

Well anyway. The number of groups that can be formed is the number of permutations of 43 times the number of partitions of 43, assuming groups with identical number of nationalities but different students are distinct groups. (Which I think is a sensible assumption, given the setting.) From that num...
by lorb
Fri Aug 19, 2016 5:59 pm UTC
Forum: Mathematics
Topic: How to Calculate Pi without a Calculator?
Replies: 66
Views: 8865

Re: How to Calculate Pi without a Calculator?

liberonscien wrote:I was wondering how one would go about solving something like ((3^0.5)/0.5).


By using google or Wikipedia to learn about rational exponents.
by lorb
Fri Aug 19, 2016 1:53 pm UTC
Forum: Mathematics
Topic: How to Calculate Pi without a Calculator?
Replies: 66
Views: 8865

Re: How to Calculate Pi without a Calculator?

[...] The Leibniz formula is easy, probably more fun than Ramanujan's, but converges very slowly. If the purpose is "I want to do something while I'm bored in class", I would probably go with the third option. Totally agree that the Leibniz formula would be an easy and somewhat fun way to...
by lorb
Fri Aug 19, 2016 8:20 am UTC
Forum: Mathematics
Topic: How to Calculate Pi without a Calculator?
Replies: 66
Views: 8865

Re: How to Calculate Pi without a Calculator?

You choose one of the many methods described here . I've seen that page before. Which one is the simplest? How does one calculate Pi without an electronic device? Continued fractions are doable by hand and yield good approximations without being too hard. Also you don't really need many digits. Eve...
by lorb
Thu Aug 18, 2016 7:20 pm UTC
Forum: Serious Business
Topic: Should We Try Solar Radiation Management?
Replies: 89
Views: 14525

Re: Should We Try Solar Radiation Management?

I'd say this concern ranks very low on the list of possible problems of SRM, especially if compared to the magnitude and acuteness of the problem it wants to solve.
by lorb
Wed Aug 17, 2016 7:37 pm UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Primes, sequences and infinite

And speaking of Riemann: I wonder... would a clean and closed formula for pi(x) automatically settle the Reimann Hypothesis? I know that if we assume RH to be true, it leads to some very tight bounds for pi(x), but does it also work in reverse? Doesn't even have to be a "clean and closed"...
by lorb
Tue Aug 16, 2016 5:39 am UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Primes, sequences and infinite

And speaking of Riemann: I wonder... would a clean and closed formula for pi(x) automatically settle the Reimann Hypothesis? I know that if we assume RH to be true, it leads to some very tight bounds for pi(x), but does it also work in reverse? Doesn't even have to be a "clean and closed"...
by lorb
Mon Aug 15, 2016 7:21 pm UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Primes, sequences and infinite

Oh well. While you are at it, would you mind to proof the Riemann hypothesis too? It's related, and shouldn't be too hard compared to what you are aiming for now. Depending on what is meant by "closed expression". If you're willing to use the Reimann zeta function itself in your expressio...
by lorb
Mon Aug 15, 2016 9:39 am UTC
Forum: News & Articles
Topic: GOP Operative Confesses: Most PACs Are Scams
Replies: 30
Views: 5694

Re: GOP Operative Confesses: Most PACs Are Scams

sardia wrote:* Why don't rich people just spend their money hiring people to work on a campaign instead of donating?


Because the people running the campaign would know better whom to hire for what tasks?
by lorb
Mon Aug 15, 2016 9:30 am UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Primes, sequences and infinite

Oh well. While you are at it, would you mind to proof the Riemann hypothesis too? It's related, and shouldn't be too hard compared to what you are aiming for now.
by lorb
Sun Aug 14, 2016 9:14 pm UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Primes, sequences and infinite

It seems you are looking for a closed formula for this?
by lorb
Sun Aug 14, 2016 4:40 pm UTC
Forum: Mathematics
Topic: Goahead52's Math Posts
Replies: 148
Views: 12455

Re: Primes, sequences and infinite

It's ln(ln(n)). You can find that information on the linked wiki page.
by lorb
Thu Aug 11, 2016 4:40 pm UTC
Forum: Serious Business
Topic: Should We Try Solar Radiation Management?
Replies: 89
Views: 14525

Re: Should We Try Solar Radiation Management?

Maybe the whole discussion should shift a little from comparing "massive solar radiation management" vs "do nothing" to "increase research and start testing of solar radiation management" vs whatever else we would do with those resources.
by lorb
Sun Jul 31, 2016 9:40 pm UTC
Forum: News & Articles
Topic: Military coup attempt in Turkey? [coup fails] [skullcracking!]
Replies: 126
Views: 20796

Re: Military coup attempt in Turkey? [coup fails]

A very significant portion of the Turkish in Germany are either former Gastarbeiter or their descendants. It's the AKP demographic. Also politics and society failed at making them part of German society. I also suspect that there is a rather big effect of In-group favoritism that turns them more nat...
by lorb
Fri Jul 29, 2016 12:51 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 6525

Re: Is the Hyperloop remotely possible?

Public transit is mostly funded by people who don't own cars at all. In the US. Germany for example gives a part of the income from a tax on gasoline to public transport entities who in turn sign an agreement to provide certain services. (That otherwise would most likely not be profitable, like bus...
by lorb
Thu Jul 28, 2016 9:43 am UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 6525

Re: Is the Hyperloop remotely possible?

Yes you are both right, the relative performance of the pumps drops with the pressure in tube but at that point they already have taken away a very big chunk of the problem. At least at those sections of the tube that are not close to the leak.
by lorb
Thu Jul 28, 2016 12:24 am UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 6525

Re: Is the Hyperloop remotely possible?

Yeah. Vacuum pumps scale rather easy. Basically you just make them bigger. A prominent example would be the pumps at SPF. ( Link ) The big ones do about 60kl/s. So about three times as much as what you are asking for and it's not like they are using some secret fancy new technology. They also sell t...
by lorb
Wed Jul 27, 2016 8:02 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 6525

Re: Is the Hyperloop remotely possible?

Just a reminder that the vacuum pumps along the tube are supposedly still working in case there is a leak. Regular cheap industrial vacuum pumps are pumping out air on the order of magnitude of about 20kl per second. Even if you have a leak of the size of the cross section of the tube (~3m^2) you ne...
by lorb
Wed Jul 27, 2016 7:17 am UTC
Forum: News & Articles
Topic: Assange Timed WikiLeaks Release of Democratic Emails to Harm Hillary Clinton
Replies: 9
Views: 2841

Re: Assange Timed WikiLeaks Release of Democratic Emails to Harm Hillary Clinton

While I really don't like Assange I don't think he timed the release to harm Hillary. I believe he timed the release to maximize media coverage, which is an established pattern with wikileaks.
by lorb
Tue Jul 26, 2016 9:46 pm UTC
Forum: Mathematics
Topic: Misunderstanding basic math concepts, help please?
Replies: 338
Views: 53257

Re: Misunderstanding basic math concepts, help please?

1) Well Formed Formula 2) Syntax 3) Rules of Deduction 4) Formal Language 5) Axiom 6) Theory Definition of terms Twistar's six definitions: [...] It would be rather important that you define each of the six separately because when people use the words "Syntax" and "Rules of Deduction...
by lorb
Tue Jul 26, 2016 9:21 am UTC
Forum: News & Articles
Topic: 2016 US Presidential Election
Replies: 8482
Views: 737767

Re: 2016 US Presidential Election

"I don't want Putin to know what I'd do if he invaded NATO" It's also an incredibly stupid argument. Putin will never invade any NATO member if the consequence is a guaranteed strike back by all of NATO, and this is how NATO works to deter a war with Russia. But if you hint at Russia that...
by lorb
Mon Jul 25, 2016 9:22 am UTC
Forum: Language/Linguistics
Topic: How many languages do you know before you mix them up?
Replies: 12
Views: 3208

Re: How many languages do you know before you mix them up?

Yeah. But the dissimilarity of the languages should help with keeping them separate in the brain. You only need a general grasp of German/Japanese word structure to be able to assign words to their language, even if you don't know them. Yeah, see what you mean. The more dissimilar the languages, th...
by lorb
Sun Jul 24, 2016 11:03 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 6525

Re: Is the Hyperloop remotely possible?

Not saying that this is already all planned for but there are a few things that will help: The vacuum pumps would still be working even if there is hole somewhere and would counteract against the shockwave. The capsules are designed to have minimal drag, so some air would flow around them by design....
by lorb
Sun Jul 24, 2016 9:54 pm UTC
Forum: News & Articles
Topic: Military coup attempt in Turkey? [coup fails] [skullcracking!]
Replies: 126
Views: 20796

Re: Military coup attempt in Turkey? [coup fails]

Amnesty International: Torture in Turkey Amnesty International has gathered credible evidence that detainees in Turkey are being subjected to beatings and torture, including rape, in official and unofficial detention centres in the country. [...] Detainees are being arbitrarily held, including in i...
by lorb
Sun Jul 24, 2016 9:36 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 6525

Re: Is the Hyperloop remotely possible?

For your concern about the single point of failure when there is a leak anywhere in the tube the design document says: 4.5.4. Structural Integrity of the Tube in Jeopardy A minor depressurization of the tube is unlikely to affect Hyperloop capsules or passengers and would likely be overcome by incre...
by lorb
Sun Jul 24, 2016 7:14 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 6525

Re: Is the Hyperloop remotely possible?

The technology itself is sound. Safety is a valid concern though. What we will see in the not-too-distant future is it being used for freight where even catastrophic failure would not risk human lives. And on shorter distances. There are plans in the making to connect Vienna with Bratislava which is...

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