Sabtu, 22 Januari 2011

Cara Kerja (Prinsip Kerja) Energi Matahari


Energi matahari adalah energi yang berasal dari matahari dan setelah itu dimanfaatkan, itu benar-benar gratis. Keuntungan lain adalah bahwa di manapun kita berada, kita dapat menggunakan energi dan menggunakan bentuk energi yang sangat baik untuk lingkungan juga. Ada banyak keuntungan dalam menggunakan aplikasi energi matahari dalam kehidupan kita sehari-hari. Pertama, bentuk energi yang berasal dari sinar matahari tidak memiliki potensi bahaya seperti energi yang berasal dari bahan bakar fosil. Energi matahari ramah lingkungan dan dapat digunakan untuk daya aplikasi elektronik yang digunakan dalam kehidupan modern.

Prinsip dasar tentang bagaimana energi matahari dikonversi menjadi listrik membantu kita untuk memahami manfaatnya. Energi panas atau energi panas matahari yang berasal dari sinar matahari diubah menjadi listrik ketika datang ke dalam kontak dengan panel surya. Panel surya yang paling sering digunakan untuk konversi ini adalah panel foto-volta. Dalam sinar matahari, panel surya atau foto secara efektif diubah menjadi volta atau listrik dan karenanya nama yang diberikan sebagai panel foto-volta.

Energi matahari juga meyakinkan kita berasal listrik tanpa emisi polutan. Hal ini dimungkinkan karena energi yang dilepaskan dari foton tidak membuat produk sampingan karbon dan karena itu suasana tidak tercemar dengan emisi karbon dioksida. Ini benar-benar menjadi kekurangan utama dari menggunakan formulir konvensional listrik.

Manfaat lain utama menggunakan bentuk energi ini adalah bahwa bentuk yang sama sekali terbarukan dari sumber energi dan juga gratis. Di tempat-tempat, di mana sinar matahari dapat diandalkan dan menjamin tempat cukup untuk menempatkan panel surya, penggunaan energi matahari sangat dianjurkan.

Di tempat tinggal, energi surya dapat digunakan untuk mengisi baterai dan membantu dalam kerja peralatan beban lebih rendah rumah, pencahayaan, pemanasan kolam renang, dll Solar pemanas air telah menjadi sangat populer di kalangan memasak publik dan surya juga disebarkan karena membantu dalam penghematan sumber daya alam serta uang.
Satu-satunya utama adalah bahwa sistem tenaga surya bekerja hanya ketika matahari bersinar dan sebagian besar panel surya tidak dapat menciptakan listrik setelah matahari terbenam. Oleh karena itu, di tempat-tempat seperti generator cadangan mungkin diperlukan untuk menyediakan listrik.

http://ezinearticles.com/?How-Does-Solar-Energy-Work?&id=5697316
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How Do 3D Televisions (3D TV) Work?


One of the emerging technologies on the market for home viewing is 3D TV. Most consumers are unaware of the inherent technology behind 3D television, leaving many to wonder, "how does 3d tv work?" Close to all of the television manufacturers have some form of 3D TV technology on the market, in various screen sizes. The most common 3D technologies for delivering the stereoscopic images to viewers are:

- Anaglyphic 3D
- Polarization 3D
- Alternate frame sequencing
- Autostereoscopic display

Anaglyphic 3D viewing is accomplished by the viewer wearing passive red and cyan lens glasses to see the images in three dimensions. Polarization 3D viewing transmits the images to viewers who are able to see in three dimensions by wearing passive polarized lens glasses. Alternate frame sequencing requires the wearing of glasses with lenses that include active shutters that allow the viewer to see traditionally two dimensional images in three dimensions. The shutters open and close depending on which eye the image needs to be seen in to make it 3D.

Autostereoscopic displays, or auto 3D, relies on transmitting images to the viewer in 3D without the viewer needing to wear specialized glasses to see the effects. There are two individual technologies associated with auto 3D, head-tracking and multiple view transmission. Head-tracking keeps a location on where the viewer is looking to ensure each eye is seeing a different image in order to transmit a picture in three dimensions. This is different from the multiple view transmission method of delivering 3D images does not need to know where the viewer's eyes are directed in order to transmit images in three dimensions.

The head-tracking method of transmitting images is generally not considered commercially viable as it limits the number of people who can view a display in three dimensions. Head-tracking, to date, only allows a single viewer to see the display in proper three dimensions. Multiple view technology is considered more commercially viable, as it allows multiple viewers to see the same image in three dimensions, regardless of where they are sitting in relation to the display.

Multi-view capture technology, which is used to film movies and television in 3D, utilizes an array of many cameras to capture images for redistribution into a multiple view format. Televisions currently on the market that utilize 3D capability, in addition to traditional 2-D viewing, generally include an Ethernet connection, USB capable player or recorder and Wi-Fi connectivity. They work in conjunction with a set-top box and LCD shutter glasses, which allows the viewer to see images on the screen in three dimensions as opposed to the traditional two.

Throughout the summer of 2010 and into the new year, manufacturers are making 3D capable television set available for $2,500 or less. There is new technology emerging on the market, which is currently only available in China, that does not require the viewer to wear special glasses. It utilizes autostereoscopic, or auto 3D technology, and currently sells for approximately $20,000. As the technology for autostereoscopy develops in the US, the price should come down to a range equivalent to television sets that currently require special viewing glasses.

There really isn't any magic to how 3D TV works. As the technology continues to evolve, we can prepare to be continually surprised by the new possibilities it brings us.

Article Source: http://EzineArticles.com/?expert=Erick_Leamy
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Jumat, 21 Januari 2011

Tentang QWERTY


QWERTY adalah salah satu jenis tata letak tombol-tombol pada keyboard. Tata letak QWERTY ini pertama kali digunakan pada sebuah mesin tik buatan E. Remington pada tahun 1874. Dinamakan demikian karena tombol-tombol huruf Q, W, E, R, T, dan Y berada secara berurutan seperti terlihat dalam baris paling atas dari papan ketik ini (yaitu yang dipakai pada kebanyakan keyboard komputer saat ini).

Hal ini berkaitan dengan sejarah mesin ketik yang ditemukan lebih dulu oleh Christopher Latham Sholes (1868). Saat menciptakan mesin ketik prototype sebelumnya, malah sangat memungkinkan kita untuk mengetik dengan lebih cepat. Terlalu cepatnya kemungkinan dalam mengetik tersebut, sampai- sampai sering timbul masalah pada saat itu. Seringkali saat tombol ditekan, batang-batang huruf (slug) yang menghentak pita itu mengalami kegagalan mekanik, yang lebih sering diakibatkan karena batang-batang itu saling mengait (jamming).

Karena bingung memikirkan solusinya pada saat itu, Christopher Latham Sholes justru mengacak-acak urutan itu demikian rupa sampai ditemukan kombinasi yang dianggap paling sulit untuk digunakan dalam mengetik. Tujuannya jelas, untuk menghindari kesalahan-kesalahan mekanik yang sering terjadi sebelumnya.

Akhirnya susunan pada mesin ketik inilah yang diturunkan pada keyboard sebagai input komputer dan pada tahun 1973 diresmikan sebagai keyboard standar ISO (International Standar Organization).

Sebenarnya ada beberapa standar susunan keyboard yang dipakai sekarang ini. Sebut saja ASK (American Simplified Keyboard), umum disebut DVORAK yang ditemukan oleh Dr. August Dvorak sekitar tahun 1940.

Secara penelitian saat itu, susunan DVORAK memungkinkan kita untuk mengetik dengan lebih efisien. Tetapi mungkin karena terlambat, akhirnya DVORAK harus tunduk karena dominasi QWERTY yang sudah terjadi pada organisasi-organisasi dunia saat itu dan mereka tidak mau menanggung resiko rush apabila mengganti ke susunan keyboard DVORAK. Satu-satunya pengakuan adalah datang dari ANSI (American National Standard Institute) yang menyetujui susunan keyboard Dvorak sebagai versi “alternatif” di sekitar Tahun 1970.

Susunan keyboard lainnya yang masih perkembangan dari susunan QWERTY adalah QWERTZ yang dipakai di negara seperti Hungaria, Jerman, Swiss, dll. AZERTY oleh negara Prancis dan Belgia, QZERTY, dll.

http://id.wikipedia.org/wiki/QWERTY
http://dhammacitta.org/forum/index.php?topic=3472.0
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Top 10 open source PHP-based CMS users by rating


A content management system (CMS) is a computer application used to create, edit, manage, and publish content in a consistently organized fashion. CMSs are frequently used for storing, controlling, versioning, and publishing industry-specific documentation such as news articles, operators' manuals, technical manuals, sales guides, and marketing brochures. The content managed may include computer files, image media, audio files, video files, electronic documents, and Web content.

1. Joomla 1.6
Joomla! is one of the most powerful Open Source Content Management Systems on the planet. It is used all over the world for everything from simple websites to complex corporate applications. Joomla! is easy to install, simple to manage, and reliable.

2. Concrete5 5.4.1.1
Concrete5 is simple for site owners to use, and powerful for site developers to work with. You owe it to yourself to check out C5.

3. Redaxscript 0.3.2
Redaxscript is a free, PHP and MySQL driven website engine for small business and private websites. It's ultra lightweight, simple and customizable.

4. MODx 2.0.7-pl
MODx is an open source CMS that helps you take control of your website. It makes updates easy, empowering end-users with as much control as you desire over website content and update frequency.

5. Drupal 7.0
Drupal is a free software package that allows anyone to easily publish, manage and organize a wide variety of content on a website. Hundreds of thousands of people and organizations are using Drupal to power an endless variety of sites.

6. CMS Made Simple 1.9.2
CMS Made Simple is an open source (GPL) package, built using PHP that provides website developers with a simple, easy to use utility to allow building small-ish (dozens to hundreds of pages), semi-static websites.

7. Contao Open Source CMS 2.9.2
Contao Open Source CMS (fka TYPOlight) is a powerful web content management system for people who want a professional internet presence that is easy to maintain. It was developed by Leo Feyer in 2006 and has been released under GNU/LGPL.

8. PHP-Fusion 7.01.03
PHP-Fusion is a light-weight open-source content management system (CMS) written in PHP4. It uses a mySQL database to store your site content and includes a simple yet comprehensive adminstration system.

9. Kryn.cms Beta 0.8
Kryn.cms is a revolutionary redefinition of content-managment-systems. Working with Kryn.cms is like working with your computer. The desktop environment gives you a familiar feeling from the moment you start working with it.

10. synType CMS V.0.12.2
synType CMS is a free open source Web Content Management System. synType CMS is fast, secure, stable and easy to learn. It provides many tightly integrated features out of the box, where other systems require external modules you may even have to pay for.

http://en.wikipedia.org/wiki/Content_management_system
http://php.opensourcecms.com/scripts/show.php?pagenumber=1
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New zodiac sign dates - and Ophiuchus ?


What's your sign? The once-familiar cheesy pick up line has recently become a hotly contested topic.

The controversy began after astronomer Parke Kunkle told the Star-Tribune of Minnesota that, due to the moon's gravitational pull, the age-old constellations corresponding to a person's birthday may be off by about a month.

Kunkle's comments set off a firestorm as people wondered if their zodiac signs were changing and astrologers rushed to refute the claim.

As if this wasn't confusing enough, there was also talk about adding a 13th sign to the mix -- Ophiuchus, which would span Nov. 29 - Dec. 17, leaving poor Scorpio with only a tiny, six-day window (Nov. 23 - Nov. 29).

So does this mean that you've been faithfully checking the wrong sign every morning for your horoscope? Not necessarily, according to Cambridge astrologer Joyce Levine.

"Don't worry. Your sign hasn't changed!" Levine said in an interview. "The precession of the equinoxes does not affect Tropical Astrology, which is primarily what we use in the western culture. Tropical Astrology is based on the seasons; Aries, the beginning of spring; Cancer, the beginning of summer; Libra, the beginning of fall, and Capricorn, the beginning of winter."

Levine said that Vedic Astrology, which is favored in the east, does take the precession of equinoxes into account.

For those who determine the zodiac signs by the stars, the new changes would be:

Capricorn: Jan. 20-Feb. 16
Aquarius: Feb. 16-March 11
Pisces: March 11-April 18
Aries: April 18-May 13
Taurus: May 13-June 21
Gemini: June 21-July 20
Cancer: July 20-Aug. 10
Leo: Aug. 10-Sept. 16
Virgo: Sept. 16-Oct. 30
Libra: Oct. 30-Nov. 23
Scorpio: Nov. 23-Dec. 17
Sagittarius: Dec. 17-Jan. 20

What do you think? Are you sticking with your current sign? Or are you looking for a switch?

Source: http://www.boston.com/news/source/2011/01/new_zodiac_sign.html
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Google CEO Eric Schmidt on Privacy, Outhouses & Proprietary Algorithms


The sensitivity of search string data is suddenly on everyone's mind due to news of the AOL data leak on a research site this week. Search Engine Watch editor Danny Sullivan is set to interview Google CEO Eric Schmidt in the premier event of the Search Engine Strategies show in San Jose. Guess what his first question is? Give us your thoughts on search data privacy - (in so many words) while holding up a copy of the New York Times. Schmidt seemed not to flinch at the question he must have known was coming in this informal conversation format arranged by Sullivan.

The leaked AOL data is actually from Google results, but AOL is clearly the bad guy here, since they leaked the info on search strings of 658,000 of it's members over a three month period and 20 million compromised searches. Sullivan pointed out that the New York Times had been able to trace the somewhat anonymized AOL member names through some very light detective work and found an AOL user whose data was part of the leak. That user was featured in a photograph on the front page and profiled. Sullivan made no connection to Google of that AOL blunder, but asked Schmidt to comment on search privacy and the sensitivity of the data.

Schmidt reminded Sullivan of the recent Department of Justice demand for all search records over a month's time and Google's refusal to give it up to DOJ. He suggested that Google works very hard to protect user data and they clearly do deserve kudos, both for refusing to give up the search data to the DOJ and for their stance on protection of that type of sensitive information. They went to court with the DOJ to take a stand on privacy of search data, rather than meekly turning it over as the other search engines did. That move gained Google some credibility which supports the famed "Do no evil" mantra of the company.

Schmidt recalled several cases of what he called "crazy people" who have been using Google search to plan and carry out all manner of nefarious deeds, from murders to suicide to stalking. He emphasized repeatedly that there is no way to stop bad people from doing bad stuff using search, but that Google is doing all they can to make it a safe environment for users. Schmidt also pointed out how Google makes it easy for users to remove their phone numbers from the Google search results. (Story for another time, but not so easy, and why is it accessible at all?).

Click fraud was next on Sullivans' agenda and he asked how Google was addressing it within the Adwords pay-per-click system. Schmidt steered clear of discussing the court case, calling it a "business negotiation done in the courtroom." He said they we're reluctant to discuss both user and advertiser data, and again, we're doing all we can to address click fraud.

Sullivan graciously backed off of the sensitive topic and moved on to the next news item of the week, the just announced Google partnerships with both MTV and MySpace. The MTV deal will allow Google to sell video ads surrounding clips of hit shows on the network. Early take-up may be only from major advertisers and it is not clear if the video ads will be sold with the automated system used for adwords, since the video ads will clearly need to be vetted for ratings and quality. The MySpace deal means that MySpace will show Adwords ads throughout communities on the social networking site and becomes the sole provider of search to all Fox Interactive Media sites in the deal.
Photo copyright 2006 by Mike Banks Valentine

Schmidt took the opportunity to emphasize the value of targeted ads being shown to users in all venues when he pointed to the radio deals, video deals and the standard text ads used by publishers of each of those sources. Sullivan had asked about the value of tracking and metrics for advertisers using Google Analytics, allowing them to do conversion studies and understand the value of their ad spending.

Sullivan used that Adwords conversion stats issue to segue' into a more delicate topic when he asked Schmidt to comment on the value of Adsense to publishers, adding a caveat to that saying that since Adsense was so valuable to publishers, that it had lead to huge amounts of junk on the web from junky publishers filling web site pages with garbage in order to place the contextual ads across loads of informational, but mostly junky sites. He suggested those sites clog up search results and produce little value for users other than to click on ads. Schmidt replied simply, "These are the problems of success." He went on to explain that Adsense has far exceeded expectations seen for it.

Schmidt discussed the proprietary Google search algorithm and how carefully it was guarded within the company, claiming that it was so closely held that "I have chosen not to know it." That statement had many SEO's in the audience groaning with some sort of envy of Schmidt being in a position to know that tightly secured secret algorithm and chosing NOT to know about it. A kind of stunned silence was palpable among many in the room, although that statement must have gone right over the heads of the mainstream press in the room.

Sullivan asked about copyright issues within the "Book Search" and other uses of print and online text within Google searches. Schmidt commented that he had learned how fluid and open to interpretation copyright law was, but that their own legal staff had determined that they were completely within legal limits with book search and "Fair Use" rules within copyright laws. He stated flatly that Google "Must respect copyright" and emphasized their commitment to do so, while claiming that book search was within legal limits.

"Google's mission is to organize the world's information and make it universally accessible and useful." That statement comes from the Google corporate info page and is well known and often quoted. Sullivan moved on to a lighter note with a reference to the Visa slogan adapted to Google, saying, "Google, We're everywhere you want to be!" (Which coincidentally turns up a ZDnet forum post on Google instead of Visa's catchphrase, as number one search result at Google.) Sullivan noted that with all the Google products coming online, such as Gmail, search, spreadsheets, calendar, personalized home page, radio ads, video ads, text ads, shopping search, Google Maps, etc., that "You might as well give me the Google implant and be done with it!

While that got a good laugh from the audience and even from Schmidt, it did cause some reflection from audience members in my quick glance around to see heads tilting to the side in contemplation of the quip.

Sullivan wrapped it up by asking some lighter questions in rapid fire fashion for quick responses from Schmidt, but one question got a great response from the Google CEO when Sullivan asked, "How often do you personally search?" Schmidt quickly replied that he routinely searches between 50 and 100 times a day and that he uses searches to inform his business decisions.

Schmidt then told the audience that he had been asked by someone once "Did you know that there are more outhouses than Tivo's?" To which Schmidt had some illuminating expanded comments. He later did some of his own searching to find that the question was in fact true previously, but that the trend had reversed and that now there are more Tivo's. He even had percentages to back it up.

That showed that he very much believes in search and uses it himself to, as he said, inform business decisions. Whether that means he is investing in Tivo or getting rid of outhouses is up for debate, but was an interesting tidbit that may be thrown around the press from the SES show coverage (I'm sure Schmidt will hope it goes no further than that).

Another Sullivan question, "What is your favorite Google tool?" to which Schmidt replied, "My favorite is the search tool, but beyond that, it is the 'Certified by Google' tool," referring to what has been called Gbuy by commentators. That allowed a bit of expansion by Schmidt on the new tool, which was clearly something he wanted to get a plug in for as a new service. Schmidt is a likable guy and everyone allowed him the plug as Google needs a bit of positive press due to the bad PR they are currently getting on "Certified by Google" with the eBay policy of not supporting the service.

Copyright August 9, 2006 by Mike Banks Valentine
San Jose Search Engine Strategies 2006
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Tentang WWW


Waring Wera Wanua atau World Wide Web (disingkat sebagai WWW atau Web) adalah suatu ruang informasi yang yang dipakai oleh pengenal global yang disebut Uniform Resource Identifier (URI) untuk mengidentifikasi sumber-sumber daya yang berguna. WWW sering dianggap sama dengan Internet secara keseluruhan, walaupun sebenarnya ia hanyalah bagian daripadanya.

WWW (World Wide Web), merupakan kumpulan web server dari seluruh dunia yang berfungsi menyediakan data dan informasi untuk dapat digunakan bersama. WWW atau biasa disebut web adalah bagian yang paling menarik dari Internet. Melalui web, dapat mengakses informasi-informasi yang tidak hanya berupa teks tetapi bisa juga berupa gambar, suara, video dan animasi.

Fasilitas ini tergolong masih baru dibandingkan surel (email), sebenarnya WWW merupakan kumpulan dokumen-dokumen yang sangat banyak yang berada pada komputer server (web server), di mana server-server ini tersebar di lima benua termasuk Indonesia, dan terhubung menjadi satu melalui jaringan Internet. Dokumen-dokumen informasi ini disimpan atau dibuat dengan format HTML (Hypertext Markup Language). Suatu halaman dokumen informasi dapat terdiri atas teks yang saling terkait dengan teks lainnya atau bahkan dengan dokumen lain.[4]Keterkaitan halaman lewat teks ini disebut hypertext. Dokumen infomasi ini tidak hanya terdiri dari teks tetapi dapat juga berupa gambar, mengandung suara bahkan klip video.[4] Kaitan antar-dokumen yang seperti itu biasa disebut hypermedia.

Jadi dapat disimpulkan bahwa WWW adalah sekelompok dokumen multimedia yang saling terkoneksi menggunakan hyperteks link. Dengan mengklik hyperlink, maka bisa berpindah dari satu dokumen ke dokumen lainnya.

Sumber: Wikipedia
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Rabu, 19 Januari 2011

Tentang RSS


RSS digunakan secara luas oleh komunitas weblog untuk menyebar ringkasan tulisan terbaru di jurnal, kadang-kadang juga menyertakan artikel lengkap dan bahkan gambar dan suara. Sekitar 2000, penggunaan RSS meluas di berbagai penerbitan berita, termasuk Reuters, CNN, dan BBC. RSS digunakan pada hampir semua situs berita atau weblog, dengan berbagai tujuan termasuk: pemasaran, press release, laporan reguler produk, atau aktivitas lain yang membutuhkan pemberitahuan periodik dan tentunya publikasi.

RSS adalah sebuah file berformat XML untuk sindikasi yang telah digunakan (diantaranya dan kebanyakan) situs web berita dan weblog. Singkatan ini biasanya mengarah ke beberapa istilah:

* Rich Site Summary (RSS 0.91)
* RDF Site Summary (RSS 0.9 and 1.0)
* Really Simple Syndication (RSS 2.0)

Teknologi yang dibangun dengan RSS mengijinkan kita untuk berlangganan kepada situs web yang menyediakan umpan web (feed) RSS, biasanya situs web yang isinya selalu diganti secara reguler. Untuk memanfaatkan teknologi ini kita membutuhkan layanan pengumpul. Pengumpul bisa dibayangkan sebagai kotak surat pribadi. Kita kemudian dapat mendaftar ke situs yang ingin kita tahu perubahannya. Namun, berbeda dengan langganan koran atau majalah, untuk berlangganan RSS tidak diperlukan biaya, gratis. Tapi, kita biasanya hanya mendapatkan satu baris atau sebuah pengantar dari isi situs berikut alamat terkait untuk membaca isi lengkap artikelnya.

Sebuah program komputer yang dikenal sebagai pembaca umpan (feed reader) bertindak sebagai pengumpul. Program ini mengecek situs yang menyediakan RSS dan menampilkan berbagai artikel baru yang ditemukan. Tenggang waktu dan siklus pengumpulan RSS biasanya dapat diatur oleh penggunanya. Program pengumpul dapat berupa program komputer atau sebuah layanan web yang tersedia online.

Program pengumpul RSS di komputer biasanya berupa aplikasi (software) sendiri yang harus dipasang di komputer sebelum dapat digunakan. Program ini tersedia untuk berbagai jenis sistem operasi dengan harga bervariasi. Ada juga program pengumpul RSS yang gratis. Lihat Daftar pengumpul RSS.

Program pengumpul di web tidak memerlukan pemasangan dan pengaturan, kita dapat melihat dan mengecek RSS kita di mana saja, asal ada browser dan koneksi internet. Beberapa layanan pengumpul RSS juga menyediakan penggabungan dan juga pencarian.

Sebuah web yang menyediakan umpan RSS biasanya ada link dengan sebuah tombol bertuliskan XML (XML iconic button) atau RSS (RSS iconic button). Namun disarankan menggunakan RSS daripada XML agar tidak membuat kerancuan (sebab setiap RSS adalah XML, tapi tidak tiap XML itu RSS).

Seperti ditulis di atas, ada beberapa versi RSS, dan bahkan ada kelompok membuat format baru Atom yang juga telah diadopsi oleh banyak situs. Tapi pemakai RSS tidak perlu bingung, para pembuat program pengumpul sindikasi biasanya bisa mengenali kedua format tersebut, bahkan masih menyediakan pembaca untuk format yang lama.

Sumber: Wikipedia
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