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Bitcoin is a digital asset and a payment system invented by Satoshi Nakamoto, who published the invention in 2008 and released it as open-source software in 2009. The system is peer-to-peer and transactions take place between users directly, without an intermediary. These transactions are verified by network nodes and recorded in a public distributed ledger called the block chain,which uses bitcoin as its unit of account. Since the system works without a central repository or single administrator, the U.S. Treasurycategorizes bitcoin as a decentralized virtual currency. Bitcoin is often called the first cryptocurrency, although prior systems existed and it is more correctly described as the first decentralized digital currency. Bitcoin is the largest of its kind in terms of total market value.
Bitcoins are created as a reward for payment processing work in which users offer their computing power to verify and record payments into a public ledger. This activity is called mining and miners are rewarded with transaction fees and newly created bitcoins. Besides being obtained by mining, bitcoins can be exchanged for other currencies, products, and services. When sending bitcoins, users can pay an optional transaction fee to the miners.
In February 2015, the number of merchants accepting bitcoin for products and services passed 100,000. Instead of 2–3% typically imposed by credit card processors, merchants accepting bitcoins often pay fees in the range from 0% to less than 2%. Despite the fourfold increase in the number of merchants accepting bitcoin in 2014, the cryptocurrency did not have much momentum in retail transactions. The European Banking Authority and other sources have warned that bitcoin users are not protected by refund rights or chargebacks. The use of bitcoin by criminals has attracted the attention of financial regulators,legislative bodies, law enforcement,and media. Criminal activities are primarily centered around darknet markets and theft, though officials in countries such as the United States also recognize that bitcoin can provide legitimate financial services.
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A REVIEW OF CROSS PLATFORM DEVELOPMENT WITH XAMARIN
According to Xamarin, there are a number of reasons to use the cross-platform development software for mobile application development. Depending on what camp you are in, there are a number of reasons not to use Xamarin for mobile application development. Some would argue that the initial apparent cost savings for a cross-platform application written in a single software language and executed on multiple platforms supersedes any other requirement. The caveat is that the perceived cost savings are not as apparent as they should be. Native application development gives the most direct path to the operating system API’s. The development in Xamarin adds an additional layer, since access to the operating system API are all provided via C# libraries, which are an abstraction layer to the actual API’s.
As of this time, Xamarin is a niche solution that has a fit for a small segment of the market. There are a few development shops offering strictly Xamarin solutions. I am of the opinion that Xamarin will continue to be a niche solution, but it will not be able to provide a compelling reason to develop native mobile application over using Xcode (Objective C or Swift) for iOS and Android Studio (Java) for Android, even at the cost of developing the two code bases for each platform.
TESTING XAMARIN
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Using Xamarin was relatively painless and easy. The Xamarin Studio Integrated Development Environment (IDE) running on the Mac was as intuitive to use as Microsoft Visual Studio and Android Studio. Creating a new project was simple and fast, and it was great that Git integration was built into the Xamarin Studio. There were a few annoyances where it was clear that the Xamarin Studio on the Mac was not as complete or robust as the Windows version and it appeared that the product was in development. Building a sample application to run on both iOS and Android was simple enough.
The Xamarin IDE performed adequately with the iOS emulators on my Mac. It was only when my attempt to run the same application as an Android Solution that I was not able to get the Android emulator to run. Every attempt at configuring the Android emulator to work with Xamarin Studio failed.
Upon creating a second application, I decided to create the sample Phoneword project that was posted in the Xamarin training web site. The Xamarin IDE provides the standard “auto-complete” for code development, and it seemed to come naturally and intuitively to auto-complete when I was coding. I was able to build the sample application but still could not get the application to run under the Android emulator.
One interesting observation that came to me when switching back and forth from C# in Xamarin and Android Java is how similar the languages seem. With the IDE auto-complete, the syntax of the languages does not represent any barriers and the languages seemed almost interchangeable. One of the things that pleased me is that Xamarin maintains the External Strings paradigm that are native to iOS and Android development.
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Dell Latitude 11 5175 Review
Dell's 10.8-inch Latitude 11 5175 is a device that thrives during both work and play. The tablet offers solid performance from its Core m5 processor and a display bright enough to make both PowerPoint presentations and movies shine. When attached to the optional Latitude 11 keyboard, this slate transforms into a mini laptop replacement that enables all-day productivity. This hybrid is on the chunky side, but overall it's a winner.
Specs
| CPU | 1.1GHz Intel Core m5-6Y57 |
|---|---|
| RAM Included | 4GB |
| RAM Upgradeable | |
| Storage Drive Size | 128GB |
| Storage Drive Type | SATA Hard Drive |
Design
Other than its soft-touch back, there isn't much to say about the Dell Latitude 11 5175's black magnesium-alloy body. The tablet's large bezel helps prevent accidental input, and it sports cameras on its front and back.
MySQL
MySQL (officially pronounced as /maɪ ˌɛskjuːˈɛl/ "My S-Q-L",[5]) is an open-source relational database management system(RDBMS).[6] In July 2013, it was the world's second most[a] widely used RDBMS, and the most widely used open-source client–server model RDBMS.[9] It is named after Michael Widenius' (who is a co-founder of MySQL) daughter, My,[10] while "SQL" stands as the abbreviation for Structured Query Language. The MySQL development project has made its source code available under the terms of the GNU General Public License, as well as under a variety of proprietary agreements. MySQL was owned and sponsored by a single for-profit firm, the Swedish company MySQL AB, now owned by Oracle Corporation.[11] For proprietary use, several paid editions are available, and offer additional functionality.
MySQL is a popular choice of database for use in web applications, and is a central component of the widely used LAMP open-source web application software stack (and other "AMP" stacks). LAMP is an acronym for "Linux, Apache, MySQL,Perl/PHP/Python". Free-software open-source projects that require a full-featured database management system often use MySQL. Applications that use the MySQL database include: TYPO3, MODx, Joomla, WordPress, phpBB, MyBB, Drupal and other software. MySQL is also used in many high-profile, large-scale websites, including Google[12][13] (though not for searches),Facebook,[14][15][16] Twitter,[17] Flickr,[18] and YouTube.[19]
On all platforms except Windows, MySQL ships with no GUI tools to administer MySQL databases or manage data contained within the databases. Users may use the included command line tools,[20][21] or install MySQL Workbench via a separate download. Many third party GUI tools are also available.
MySQL is written in C and C++. Its SQL parser is written in yacc, but it uses a home-brewed lexical analyzer.[22] MySQL works on many system platforms, including AIX, BSDi,FreeBSD, HP-UX, eComStation, i5/OS, IRIX, Linux, OS X, Microsoft Windows, NetBSD, Novell NetWare, OpenBSD, OpenSolaris, OS/2 Warp, QNX, Oracle Solaris, Symbian,SunOS, SCO OpenServer, SCO UnixWare, Sanos and Tru64. A port of MySQL to OpenVMS also exists.[23]
The MySQL server software itself and the client libraries use dual-licensing distribution. They are offered under GPL version 2,[24] beginning from 28 June 2000[25] (which in 2009 has been extended with a FLOSS License Exception)[26] or to use a proprietary license.[27]
Support can be obtained from the official manual.[28] Free support additionally is available in different IRC channels and forums. Oracle offers paid support via its MySQL Enterprise products. They differ in the scope of services and in price. Additionally, a number of third party organisations exist to provide support and services, including MariaDB and Percona.
MySQL has received positive reviews, and reviewers noticed it "performs extremely well in the average case". and that the "developer interfaces are there, and the documentation (not to mention feedback in the real world via Web sites and the like) is very, very good".[29] It has also been tested to be a "fast, stable and true multi-user, multi-threaded sql database server"
Diesel Watches Review and Buying Guide
Diesel is a large Italian fashion brand that got its start in clothing and eventually expanded into accessories such as watches. Diesel simply licenses its brand to large watch producer Fossil which designs and creates their watches, just a they do for a number of different fashion brands.
As with most other fashion brands watches, especially those produced by Fossil, the exterior quality is mediocre at best and the internal movement is basic quartz. This means you are paying a pretty penny for just a brand name and a design. If look is all that matters to you then Diesel watches can still be a great option.
The main selling point of these watches are both their wide selection of self declared “XXL” watch models (meaning the watch case is large in diameter) and their unique, detailed designs that really stand out.
Diesel is primarily focused on mens watches with 4 primary types, SBA (their especially unique pieces), Chronograph, Analog and Digital. But they do offer both Chronograph and Analog models for women.
The retail pricing for these watches averages out to about $350 for their SBA collection, $200 for their chronographs and $120 for their analog and digital models.
Most Diesel watches would go great with a wide variety of casual or classy casual fashion styles making those the ideal use cases. Some models however could work with business wear if you would like a splash of trendiness instead of the typical simple and clean business style. These watches are definitely not recommended for active wear as the risk of irreparably damaging the piece greatly increases.
These watches do come with a two year warranty but a very weak one that doesn’t cover defects in material or workmanship of the battery, case, crystal, strap or bracelet. Only the pieces most likely to break down.
These are great looking pieces with from a world renown brand but do not expect the watches to last very long. By being very careful with them, you have a better chance of extending their life.
Diesel Watches Review Summary
What makes these watches perfect for you?
1. You prefer very large, detailed watch faces that grab attention
2. You don’t mind sacrificing quality for a cool design and style
3. You are looking for a watch to compliment your casual style
Diesel Watch Buying Guide
We have researched all the available Diesel watches to bring you our top recommendations for both mens and womens watches.
We have selected the following based on a combination of popularity, ratings and uniqueness in style.
Coming Soon!
UBUNTU : the most famous linux operating system .
Ubuntu (/ʊˈbuːntʊ/ uu-boon-tuu) [14] is a Debian-based Linux operating system and distribution for personal computers,smartphones and network servers. It uses Unity as its default user interface. It is based on free software and named after the Southern African philosophy of ubuntu (literally, "human-ness"), which often is translated as "humanity towards others" or "the belief in a universal bond of sharing that connects all humanity".[15]
Development of Ubuntu is led by UK-based Canonical Ltd.,[16] a company owned by South African entrepreneur Mark Shuttleworth. Canonical generates revenue through the sale of technical support and other services related to Ubuntu.[17][18] The Ubuntu project is publicly committed to the principles of open-source software development; people are encouraged to use free software, study how it works, improve upon it, and distribute it.[19][20]
In March 2016 Microsoft announced that they would support the Ubuntu userland on top of the Windows 10 kernel by implementing the Linux system calls as a subsystem.[21]
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History and development process
Ubuntu is built on Debian's architecture and infrastructure, to provide Linux server, desktop, phone, tablet and TV operating systems. Ubuntu releases updated versions predictably every six months, and each release receives free support for nine months (eighteen months prior to 13.04) with security fixes, high-impact bug fixes and conservative, substantially beneficial low-risk bug fixes. The first release was in October 2004.
It was decided that every fourth release, issued on a two-year basis, would receive long-term support (LTS). Long-term support includes updates for new hardware, security patches and updates to the 'Ubuntu stack' (cloud computing infrastructure).[18] The first LTS releases were supported for three years on the desktop and five years on the server; since Ubuntu 12.04 LTS, desktop support for LTS releases was increased to five years as well.[25][26][27] LTS releases get regular point releases with support for new hardware and integration of all the updates published in that series to date.
Ubuntu packages are based on packages from Debian's unstable branch. Both distributions use Debian's deb package format and package management tools (APT and Ubuntu Software Center). Debian and Ubuntu packages are not necessarily binary compatible with each other, however; packages may need to be rebuilt from source to be used in Ubuntu.[29] Many Ubuntu developers are also maintainers of key packages within Debian. Ubuntu cooperates with Debian by pushing changes back to Debian,[30] although there has been criticism that this does not happen often enough. Ian Murdock, the founder of Debian, had expressed concern about Ubuntu packages potentially diverging too far from Debian to remain compatible.[31] Before release, packages are imported from Debian Unstable continuously and merged with Ubuntu-specific modifications. One month before release, imports are frozen, and packagers then work to ensure that the frozen features interoperate well together.
Ubuntu is currently funded by Canonical Ltd. On 8 July 2005, Mark Shuttleworth and Canonical Ltd., announced the creation of the Ubuntu Foundation and provided an initial funding of US$10 million. The purpose of the foundation is to ensure the support and development for all future versions of Ubuntu. Mark Shuttleworth describes the foundation as an "emergency fund"; which in such a case, Canonical's involvement ends
On 12 March 2009, Ubuntu announced developer support for 3rd-party cloud management platforms, such as those used at Amazon EC2.
Unity has become the default GUI for Ubuntu Desktop .
Java (programming language)
"Java language" redirects here. For the natural language from the Indonesian island of Java, see Javanese language.
This article is about a programming language. For the software package downloaded from java.com, see Java SE.
Not to be confused with JavaScript.
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| Paradigm | Multi-paradigm: Object-oriented(class-based), structured,imperative, generic, reflective,concurrent |
|---|---|
| Designed by | James Gosling |
| Developer | Sun Microsystems (now acquired by Oracle Corporation) |
| First appeared | May 23, 1995[1] |
| Typing discipline | Static, strong, safe, nominative,manifest |
| License | GNU General Public License,Java Community Process |
| Filename extensions | .java , .class, .jar |
| Website | java |
| Major implementations | |
| OpenJDK, GNU Compiler for Java (GCJ), many others | |
| Dialects | |
| Generic Java, Pizza | |
| Influenced by | |
| Ada 83,C++,[2] C#,[3] Eiffel,[4] Generic Java,Mesa,[5] Modula-3,[6] Oberon,[7] Objective-C,[8]UCSD Pascal,[9][10] Object Pascal[11] | |
| Influenced | |
| Ada 2005, BeanShell, C#, Chapel,[12] Clojure,ECMAScript, Fantom, Groovy, Hack,[13] Haxe,J#, JavaScript, Kotlin, PHP, Python, Scala,Seed7, Vala | |
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Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented,[14] and specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA),[15] meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.[16] Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless ofcomputer architecture. As of 2016, Java is one of the most popular programming languages in use,[17][18][19][20] particularly for client-server web applications, with a reported 9 million developers.[citation needed] Java was originally developed by James Gosling at Sun Microsystems (which has since been acquired by Oracle Corporation) and released in 1995 as a core component of Sun Microsystems'Java platform. The language derives much of its syntax from C and C++, but it has fewer low-level facilities than either of them.
The original and reference implementation Java compilers, virtual machines, and class libraries were originally released by Sun under proprietary licences. As of May 2007, in compliance with the specifications of the Java Community Process, Sun relicensed most of its Java technologies under the GNU General Public License. Others have also developed alternative implementations of these Sun technologies, such as the GNU Compiler for Java (bytecode compiler), GNU Classpath (standard libraries), and IcedTea-Web (browser plugin for applets).
The latest version is Java 8, which is the only version currently supported for free by Oracle, although earlier versions are supported both by Oracle and other companies on a commercial basis.
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