We started producing shows as Today with a Techie 8 years, 10 months, 29 days ago. Our shows are produced by listeners like you and can be on any topic that "are of interest to hackers". If you listen to HPR then please consider contributing one show a year. If you record your show now it could be released in 29 days.
We are a podcast community looking to help out a friend in need. Recently, our friend, 5150, lost his home that he shares with is father to a house fire. Both were able to make it out ok, but he is in the hospital with 2nd degree burns. His father is elderly and has been moved to assisted care while he is recovering.
We are looking to help 5150 get back on his feet. Our aim is raise $10,000 to help him and his father out. Please help contribute anything you can. We would also like to you share out this campaign to your Facebook, Twitter and Google+ accounts to help spread the word and help us reach this goal.
Thank you for all your support.
A ramble about stars, by a geeky chap who resides on planet Earth. This episode is entitled a wee dot on a dark sky.
I comment briefly on why it's remarkable that the night sky is dark. I then go on to talk about the colour of stars, which we can just perceive with the naked eye. To learn more you need to use a prism, or, as professional astronomers prefer, a diffraction grating to obtain a spectrum of a star. I talk a little too much about the mathematics of diffraction gratings but eventually get back to talking about spectrum of the Sun which in overall shape is very close to what physicists call a black body spectrum (http://en.wikipedia.org/wiki/Black_body)- the spectrum any object will have at a given temperature. Astronomers and physicists prefer to measure temperature in units of kelvin (http://en.wikipedia.org/wiki/Kelvin), and to convert to it you only need to add 273 to the celsius temperature. Conversion from Fahrenheit is left as an exercise to the listener.
The Sun shows spectral lines, specifically dark lines on the broad spectrum called absorptions lines. This is caused by atoms in a cooler layer of gas (called the chromosphere) that's just above the bright surface of the Sun (called the photosphere). In fact, Helium is named as such because it was first discovered by its absorption lines in the solar spectrum (Helios is Greek for Sun). Many other elements can be found in the spectrum of the Sun and other stars, but most of the mass of all stars is made up of hydrogen and helium.
The temperature of a star is correlated with colour, with blue stars being hotter than red stars. This was originally measured by astronomers by something called colour or B-V (B minus V) index.
The luminosity of a star is the rate at which it emits energy as light, and can be measured in the same units as light bulbs, i.e. watts (W). But to estimate the luminosity we need to know the distance to a star which, for nearby stars, can be found by the parallax method. By plotting colour index (a proxy for temperature) against luminosity we can form a key piece of empirical evidence - the Hertzsprung Russell diagram: http://en.wikipedia.org/wiki/Hertzsprung%E2%80%93Russell_diagram
It turns out that our nearest star - the Sun - is quite unremarkable. It is neither very hot or cool, nor very bright or dim - it's a fairly typical star.
Welcome to our new hosts:
Last Month's Shows
Comments this month
There are 17 comments:
(2014-08-19) "Introducing Nikola the Static Web Site and Blog Generator"
- x1101 on 2014-08-21: "Thanks!"
- guitarman on 2014-08-23: "Cool"
(2014-08-08) "The JFS File System"
- Klaatu on 2014-08-11: "JFS works for me."
(2014-08-07) "Many-to-many data relationship howto"
by Mike Ray.
- Dave Morriss on 2014-08-08: "Thanks for an impressive show"
- Mike Ray on 2014-08-10: "Hope it wasn't too long and technical"
- Ken Fallon on 2014-08-11: "Brilliant episode but I'm still not convinced"
- Mike Ray on 2014-08-11: "Scalability"
- Ken Fallon on 2014-08-16: "Scalability is not an issue."
- Mike Ray on 2014-08-16: "Scalability"
- Ken Fallon on 2014-08-19: "Straw Man Argument"
- Mike Ray on 2014-08-21: "New host name"
(2014-08-06) "Blather Speech Recognition for Linux"
by Jon Kulp.
- klaatu on 2014-08-11: "Amazing!"
(2014-08-04) "HPR Community News for July 2014"
by HPR Volunteers.
- Steve Bickle on 2014-08-05: "How /etc is pronounced"
- Dave Morriss on 2014-08-07: "Et cetera, and so forth"
- Mike Ray on 2014-08-08: "/etc blah blah"
(2014-07-17) "07 - The Crown Conspiracy"
- brijwhiz on 2014-08-03: "Journey comments and next book podcast"
(2013-03-07) "Old Time Radio on the web"
by Frank Bell.
- Mike Ray on 2014-08-08: "OTR"
- guitarman for messing up attribution, and the shownotes
- semioticrobotic for mixing up his shows
In this episode we discuss the function for determining the loan payments on a car loan, compare a manual calculation with the use of the PMT function, and derive some useful lessons.
For years our own Josh Knapp has been the real Server Administrator behind Hacker Public Radio, and has been subsidising it out of his own pocket for some time.
He and a few of his colleagues have decided to branch off and set up their own company. AnHonestHost.com is based on a simple idea; Better web hosting that's honest and fair.
We discuss the past, the future and how it affects HPR.
Podcast Generator - Software which can host your podcast and generate all the RSS feeds. http://podcastgen.sourceforge.net/
Blue Drava Podcast - a little show I'm working on, hosted using the software. http://podcast.bluedrava.com
In this episode: An analysis of Tesla's patent decision, the 12 most pressing challenges for open source projects, and an update on the GNU Health project.
Back in 2001 there was a certain incident on September 11 that lead many people to go OMG! We are doomed! We must increase security! Do whatever it takes! And the NSA was happy to oblige. And on 7/7/05 an attack in London added to the frenzy. I think it is fair to say that these security agencies felt they were given a mandate to do anything as long as it stops the attacks, and thus was the overwhelming attack on privacy moved to a whole level higher. To be clear, security agencies are always pushing the limits, it is in their DNA. And politicians have learned that you never lose votes by insisting on stronger security and appearing tough. - For more go to http://www.zwilnik.com/?page_id=577
Klaatu interviews a programmer about new crowd-sourced air quality detection systems. Big crowds at this Carnegie Melon event, so the sound quality is not great.
LinksCMU CREATE Lab
In this episode, the hackerpublicradio.org Audiobook Club reviews How to Succeed in Evil: The Novel by Patrick E. McLean.
- You can download this audiobook for free (or voluntary donation) from http://podiobooks.com/title/how-to-succeed-in-evil-the-novel/
- It's also available as an ebook on Amazon: http://www.amazon.com/How-Succeed-Evil-Patrick-McLean-ebook/dp/B00589W1DM
- You can find more content (including podcasts) from Patrick E. Mclean on his websites -- http://succeedinevil.com/ -- http://www.patrickemclean.com/ -There is even a promotional comic book http://www.succeedinevil.com/evilfinalsmall.pdf
Three out of four of us liked this book, and we all had some good things to say about it. While it's true that this is an entertaining story set in a super hero world, we found it it more amusing and more thought provoking than your average super hero story.
As usual, during this episode of the AudioBookClub the hosts have each reviewed a beverage of their choice.
- pokey drank a Sam Adams Summer Ale http://www.samueladams.com/craft-beers/summer-ale.
- Thaj drank a home brewed Iced Tea https://en.wikipedia.org/wiki/Iced_tea .
- x1101 was drinking 32oz of water from the great tasting state of Maine out of a Nalgene water bottle http://nalgene.com/ .
- FiftyOneFifty was drinking Jim Beam Rye Whisky http://www.jimbeam.com/other-bourbons .
Our next audiobook will be Down and Out in the Magic Kingdom by Corey Doctorow http://podiobooks.com/title/down-and-out-in-the-magic-kingdom/ Our next book club recording will be 2014/07/15T23:00:00+00:00 (https://en.wikipedia.org/wiki/ISO_8601#Times) If you'd like a Google calendar invite, or if you'd like to be on the HPR_AudioBookClub mailing list, please get in contact with us on the HPR mailing list 'hpr at hackerpublicradio dot org'
There are several ways to submit feedback for this episode including the HPR mail list email@example.com, and the episode's comment section
pokey prefers his feedback to come via the HackerPublicRadio comment system, but is also usually available on StatusNet @pokey/micro.fragdev.com
Please remember to visit the HPR contribution page. We could really use your help right now. http://hackerpublicradio.org/contribute.php
We had a great time recording this show, and we hope you enjoyed it as well. We hope you'll consider joining us next time. Thank you very much for listening.
Sincerely, The HPR_AudioBookClub
P.S. Some people enjoy finding mistakes. For their enjoyment, we have included a few.