Happy Pi Day, notes on the mathematical expression π

In the calendar there are two celebrations in honor of the mathematical expression Pi Day “Pi” and “Pi Approximation Day. This celebration was an occurrence of the physicist Larry Shaw in San Francisco, and has been gaining in popularity to the point of having in 2009 with a successful resolution of the House of Representatives of the United States in declaring March 14 as a national day of π.

By the way it is written in the format used in the United States, March 14 (3 / 14) has become an unofficial celebration for the “Pi Day”, derived from the approximation of three digits of pi : 3.14. Usually the conclusion is concentrated at 1:59 PM (in recognition of the six-digit approximation: 3.14159), although some people claim that they are actually from 13:59, so the right thing would be to hold the 1:59 possibly to be taken early evening hours to facilitate the conclusion.

Mathematicians and teachers from various schools around the world organize events and meetings on this date. Some groups meet to discuss and comment on the importance of pi in their lives, sharing stories or theorize as would be the world without the existence of pi. Other groups gather to watch the cult film, Pi, faith in chaos. It is also common to eat cakes with motifs on π, another play on words in the English language as well as foot pi (pie) have the same pronunciation. In fact, to celebrate the day of Pi , many netizens have created songs with the title song and Pi have videos uploaded to Youtube, singing or playing an instrument, a user has specifically used the melody of the American Pie films.

The point Pi “final” would have occurred on March 14, 1592 at 6:53 with 58 seconds (AM). This, written in U.S. format, it would be 3/14/1592 6:53.58, which would correspond to the value of pi expressed in twelve digits: 3.14159265358.

Pi Approximation Day

The “Pi Approximation Day” can be identified in any of these dates:

* 22 julio, 22 / 7 on the international date format. 22 / 7 \ simeq 3.14286 is an approximation of pi.
    * 26 April (or April 25 in leap years), the day the earth completes two astronomical units of its annual orbit (ie, two radians). The total length of Earth’s orbit divided by the length covered to this day is equal to pi.
    * December 21 (December 20 in leap years), which is day 355 of year, at 1:13 PM, coinciding with the approximate value of 355/113 \ simeq 3.141593; calculated by Zu Chongzhi.
    * 10 November (November 9 in leap years), who is day number 314 of the year according to the Gregorian calendar.

On the mathematical Pi

π (pi) is the ratio between the length of a circle to its diameter in Euclidean geometry. It is an irrational number which is commonly used in mathematics, physics and engineering matters. The numerical value of π, truncated to its first digit is: \ pi \ approx 3 (,) 14159265358979323846 …

The value of π has been obtained with different approaches throughout history, being one of the more mathematical constants that appear in the equations of physics, along with the number e. Therefore, perhaps the most constant passion erupts between professional and amateur mathematicians. The relationship between the circumference and diameter is not constant in non-Euclidean geometry. Irrational numbers are the elements of the real line (whole, natural and rational) that can not be expressed by the quotient of two integers and are characterized by infinite decimals that do not follow a defined period, the irrational number is not an infinite decimal newspaper, I could never finish writing all places. As a result, the most well known irrational numbers are identified by special symbols.

Notation with the Greek letter π comes from the initial words of Greek origin “περιφέρεια” (periphery) and περίμετρον “(perimeter) of a circle, notation was first used by William Oughtred (1574-1660), and proposed use by the Welsh mathematician William Jones (1675-1749), although it was the mathematician Leonhard Euler, in his book “Introduction to Calculus” in 1748, who popularized it.

The search for the greater number of decimal places the number π has been a constant effort of many scientists throughout history. In ancient Egypt, a scribe Ahmes in 1800 a. C., approaches described in the Rhind papyrus, which employs an approximate value of π by saying that: the area of a circle is similar to that of a square whose side equals the diameter of the circle down to 1 / 9, ie equal to 8 / 9 of the diameter.

Of the eight mathematical documents found in ancient Egyptian culture, talking about two circles. One is the Rhind papyrus and the other is the Moscow papyrus. Only in the first speech of the approximate value of the number π. The Rhind papyrus shows the Egyptian numbering system as well as an organization of arithmetic and geometry problems, was bought by a Scotsman in 1858 during a visit to Luxor.

Archimedes (third century before our era) was able to determine the value of π between the interval by 3 10/71, as the minimum value, and 3 1 / 7, the maximum value. With this approximation of Archimedes gets a value with an error of between 0.024% and 0.040% on the actual value. The method used by Archimedes was simple and consisted circumscribe and inscribe regular polygons of n-sided circles and calculate the perimeter of these polygons. Archimedes started with hexagons circumscribed and inscribed, and was doubling the number of sides to reach 96-sided polygons.

More information about mathematical methods to achieve approximations to a larger number of digits of Pi, from millennia before our era, to modern computer and stage, Wikipedia.

Cases Novothink with solar panels to charge the battery of iPhone and iPod touch

One of the drawbacks which become more common to smartphones or smart phones high end, is that if you use many of its functions, the battery is consumed quickly, giving only a few days of autonomy. New covers Novothink may, if we are patient load an auxiliary battery that serves to iPhone and iPod touch using solar chargers. They are models that carry a spare battery can be recharged by solar panels on the back, whereas he is to have them exposed without taking their hands full.

Novothink reports covers roughly the battery placed in the sun for two hours, we will provide up to 30 minutes talk on an iPhone 3G. The battery gives more room for operation, for example up to 20 hours listening to music or four using the 3G network to connect to the Internet. It includes a very useful application that provides an estimate of how much sun they need to keep our phone’s battery or independently depending on the player we use it daily.

Regarding the specifications, the sleeve comes to iPhone 3G models, 8 and 16 GB, as well as 3GS iPhone 16 GB and 32 GB, weighs 79 grams and its design allows the magazine placed in the full use of the touch screen, full sun the solar panel output is 5.5V 100 mAh, for the Li-ion rechargeable battery is 1320 mAh lithium, 3.7 V. The case for iPod touch is for second-generation models with capacities from 8 to 64 GB, weighs 76 grams and offers the same features in the battery, also comes in different colors.

More information on the official website of Novothink.

My birthday gifts

Last Sunday was my birthday , a part of the celebration and play these days as I had indicated my birthday gifts . There were gifts of all: gifts techie , typical gifts, original gifts … in this post I will tell every one of my birthday presents , for if ye are like ideas birthday gift when you have any commitments or holding close.

Josep, my partner gave me nothing more, nothing less than a 16GB iPhone 3GS . And is that long ago that was after an iPhone, but, gentlemen, do not know if other cities feel the same, but in Barcelona it is almost mission impossible to find one of the features and color you want. He had spent multiple times by several shops and were always waiting to arrive … but anyway, that is another issue, I have my iPhone, a whim that made me a lot of illusion. Another day I count my first impressions of this gadget in our blog SomosMac, a vision of someone who started in the world Apple and in particular the iPhone . My parents gave me money for a Travel , they know we love to travel, and in those of short breaks or trips is always better than what book the person, by issues of availability of holidays, destinations favorites, etc.. With what my parents decided that maybe we gave the money and we organize the trip ourselves. We already have some destinations in mind, probably for Easter: Marrakech or Maltese , which is now very very affordable. Ya os iré contando.

My in-laws, meanwhile, gave me a Action very beautiful and original collection Watermark of Joid’art . A collection that interprets trends to be present with a personal touch. The truth is not loose, I am so when I have new earrings almost always put them up after a while I begin to socialize with others who have. Too bad they do not sell online.

And now come the gifts of my friends and coworkers: 3 very original gifts that I loved and I’d like to thank you from here, thanks chic @ s! First, a story for adults , The Cinderella would not eat partridges . Tale Nunila Lopez Salamero and illustrations Myriam Cameros Sierra . A story is charming and I in which the pictures are fine, I recommend it.

It also gave me a Theme pack Happy Pills , packs if you know Happy Pills will already know that they are very original and fun. For those who do not know it’s Happy Pills jars of sweets presented in the form of medicines prescriptions very horny and fun. In my case they gave me the pack is “ Atomarporsaquina ” ideal “ a radical solution to the problems of working “. The trinkets, very good, hence the hasty photo before we brush my work in one of the boats in less than 1 hour.

And finally, a Bear the collection Bobots of The Room Nekane . To give you an idea is a collection of 9 plush, Bobots, funny-shaped robots. That gave me: Atomicbot (pictured), the others are Spybot, Retrobot, Ecobot, Codebot, Loverbot, Screambot, CSIbot and Emoticbot. All very funny and original, try to complete the collection.

And here my gift list this year. The truth is that I’ve loved the birthday gifts , thank you very much everybody!

Also received congratulations from several online stores which I am client or brand of which I am a user, including 2 made me a gift: Pros and Cacique. I’ll tell you in a future post.

The authorship of this article belongs to Yes, I know

My birthday gifts

The look of the guests at the premiere of The Runaways

The premiere of the film The Runaways met in Los Angeles to a large number of young actors including two of the most sought after actresses of the moment: Kristen Stewart, the star of Twilight and Dakota Fanning, who as a child prodigy has gone on to become in a very stylish teenager, thanks to his years of experience on a red carpet.

The first chose a fuchsia dress completed Doo.Ri black heels.

But Dakota Fanning was undoubtedly the most elegant evening with a design for Valentino Haute Couture 2009 in silver and gold.

Meanwhile Joan Jett was the choice of the party with a rocker style in black leather.

DH57JG Intel, Core Mini ITX for i3, i5 and i7

At last we have a new motherboard in ATX format that is able to support Intel’s new socket micros 1156 series i3, i5 and i7.

And of course, is Intel the first to unveil this plaque. In Missingremote have proven time and we can read his impressions in this analysis. He has attracted much attention particularly low consumption of the whole. They had it connected to a power 150w. and had no problems.

I’ve since looked at the lists of our suppliers and have seen this board and in a few entry sites for late next week. So, as had long been hoping for something similar, because I have three PCs configured with this motherboard:

– I3 Micro hFX: a system mounted in a box hFX. In this way we get a very compact team with no fan spinning inside.

– Segona Mini i3: Silverstone SG05 box, very quiet, thanks to its single 12cm fan. and the little noise that the official Intel heatsink. Also going with a 1 tera hard disk 5900 rpm. low noise level.

– Segona Mini i5: Silverstone SG06 box, just as quiet as its predecessor. But now with an i5 661 with a hard disk of 2 teras.

And this is just the beginning. I hope that when there is something more than availability of these plates, and the price drops a bit, we have many more very small systems, but good power, thanks to these buses that consume very little and so small these motherboards. It is happening to me a system with powerful graphical and yet another for a smaller size yet.

Swimwear Mango spring summer 2010

Surely you’re ready to enjoy the coming spring summer 2010 vacation, and it is essential to get the swimsuit that will take us to enjoy the sea or the pool. The trend in swimwear is leaning toward the moon and printto animal that is very present in these swimwear spring summer 2010 Mango .

There is one piece swimsuits and two pieces that are beautiful and very flattering proposals for each body type. If not you find out what swimsuit is the best you have left, you may have seen in other post on our page where we recommend swimsuits as body type, so you can make designs more beautiful and more flattering.

Images: Mangoshop.com

We also interested to:

Tips for choosing flattering beachwear, girls with small breasts

Tips for choosing flattering beachwear, girls with wide hips

Tips for choosing flattering beachwear, girls with more kilos

Tips for proper shower

It is true that science does not require a shower, you can keep soap and water and the work is done. But did you know that many things we do almost without thinking while showering harm us when our skin and hair care? certainly not what you thought and some skin problems are the result of just that, ignorance of how we take that shower and restorative limpidora of each day.

Tips to shower properly , and not only to achieve the cleaning of our body but also her beauty. Nothing fancy just a few small changes that will result in your benefit.

• To swim is important to note that water should be warm to hot, too cold to sit in the environment note that the excessive warmth of the water dehydrates the skin and dry hair. So a warm shower is the ideal temperature. At the end of the shower would be worth a little cold water on her breasts because it activates the circulation and is a good remedy against sagging.
• Are you ready to swim? Not forget to use good quality towel a few strands of some towels tend to damage the hair texture. Use a mild soap and without many perfumes and alcohol, but they are delicious the healthiest are those who are devoid of these ingredients because it cleaned without irritating. Use the right shampoo and conditioner for your skin type.
• Do not stand under the shower for a long time, no matter how delicious that looks like this also hurts you because the skin loses its natural oils and leaves drying up. So plan a shower for 20 minutes and out. If you feel stressed or bored take a relaxing day at home on Saturday, and poured water into the tub and take a quiet and relaxing bath, dry yourself well and do not forget to leave humectarte.
• The warm water helps with the exfoliation, so do not forget to use a toilet brush with a soft texture, who like clean caress your skin, you can rub it to remove dead cells from your skin, even when you do not exfoliate with something extra, brush off soil.
• When you dry them gently passed not only rub the towel and rub removes hair without water and let out the moisture with natural air.
• Apply your moisturizer generously because evenings or not inside the shower tends to dry skin.

We also interested to:

Natural mask for dry skin

Natural Remedy for removing make face

Beauty Games

If you like the Olympics of beauty and want to play them from your browser. In Games Flasheros ma 1000 games you can find flash and a daily update of games.

Here I leave some :

Beauty Games

Beauty Makeover

Juliana Martins

Fashion Boutique

Alejandra

Other sections of games:

• Make Up Games

Analysis of 6-core Core i7 with 980x

Intel already has a new monster on the street, the Core i7 980x, which comes with six cores.

We see a very complete analysis Hardware.fr where micro look like this is at the top of the table of power desktop processors.

The main novelty is the presence of 6 nuclei which also increase the cache to 12 megs. It is curious in testing, now has six cores as if that was much more noticeable improvement systems using triple channel memory (ie groups of three chips of the same capacity) than with 4-core models.

Now to wait for Intel to take a model with a more affordable price for this technology can be affordable for everyone, because the price of nearly 1,000 per processor, I see a bit high.

Inexpensive Prom Makeup Tutorial – makeup tips video

In this video you can see full makeup tutorial. Watch movie and learn to makeup :

Next Page »