Delta Air Lines, Inc. referred to as Delta, is one of the major airlines of the United States and a legacy carrier. It is headquartered in Georgia; the airline, along with its subsidiaries and regional affiliates, including Delta Connection, operates over 5,400 flights daily and serves 325 destinations in 52 countries on six continents. Delta is a founding member of the SkyTeam airline alliance. Delta has nine hubs, with Atlanta being its largest in terms of total passengers and number of departures, it is ranked second among the world's largest airlines by number of scheduled passengers carried, revenue passenger-kilometers flown, fleet size. It is ranked 69th on the Fortune 500. Delta Air Lines' history begins with the world's first aerial crop dusting operation called Huff Daland Dusters, Inc; the company was founded on March 2, 1925, in Macon and moved to Monroe, Louisiana, in summer 1925. They flew a Huff-Daland Duster, the first true crop duster, designed to combat the boll weevil infestation of cotton crops.

C. E. Woolman, general manager and Delta's first CEO, led a group of local investors to acquire the company's assets. Delta Air Service was incorporated on December 3, 1928, named after the Mississippi Delta region. Passenger operations began on June 17, 1929, from Dallas, Texas, to Jackson, with stops at Shreveport and Monroe, Louisiana. By June 1930, service had extended east to Atlanta and west to Texas. Passenger service ceased in October 1930 when the air mail contract for the route Delta had pioneered was awarded to another airline, which purchased the assets of Delta Air Service. Local banker Travis Oliver, acting as trustee, C. E. Woolman and other local investors purchased back the crop-dusting assets of Delta Air Service and incorporated as Delta Air Corporation on December 31, 1930. Delta Air Corporation secured an air mail contract in 1934, began doing business as Delta Air Lines over Mail Route 24, stretching from Fort Worth, Texas, to Charleston, South Carolina. Delta moved its headquarters from Monroe, Louisiana, to its current location in Atlanta in 1941.

The company name became Delta Air Lines in 1945. In 1946, the company commenced scheduled freight transport. In 1949, the company launched the first discounted fares between Miami. In 1953, the company launched its first international routes after the acquisition of Chicago and Southern Air Lines. In 1959, it was the first airline to fly the Douglas DC-8. In 1960, it was the first airline to fly Convair 880 jets. In 1964, it launched the Deltamatic reservation systems using computers in the IBM 7070 series. In 1965, Delta was the first airline to fly the McDonnell Douglas DC-9. By 1970, Delta had an all-jet fleet, in 1972 it acquired Northeast Airlines. Trans-Atlantic service began in 1978 with the first nonstop flights from Atlanta to London. In 1981, Delta launched a frequent-flyer program. In 1987, it acquired Western Airlines, that same year Delta began trans-Pacific service. In 1990, Delta was the first airline in the United States to fly McDonnell Douglas MD-11 jets. In 1991, it acquired all of Pan Am's trans-Atlantic routes and the Pan Am Shuttle, rebranded as the Delta Shuttle.

Delta was now the leading airline across the Atlantic. In 1997, Delta was the first airline to board more than 100 million passengers in a calendar year; that year, Delta began an expansion of their international routes into Latin America. In 2003, the company launched a low-cost carrier. On September 14, 2005, the company filed for bankruptcy, it emerged from bankruptcy in April 2007 after fending off a hostile takeover from US Airways and its shares were re-listed on the New York Stock Exchange. The acquisition of Northwest Airlines was announced April 14, 2008, it was approved and consummated on October 29, 2008. Northwest continued to operate as a wholly owned subsidiary of Delta until December 31, 2009, when the Northwest Airlines operating certificate was merged into that of Delta. Delta completed integration with Northwest on January 31, 2010, when their computer reservations system and websites were combined, the Northwest Airlines brand was retired. Delta and its worldwide alliance partners operate more than 15,000 flights per day.

Delta is the only U. S. carrier that flies to Accra, Dakar, Düsseldorf, Lagos and Stuttgart. Delta has nine hubs. Atlanta – Delta's hub for the Southeast and its main gateway to Latin America and the Caribbean. In addition to its corporate headquarters, Delta operates its primary hub in Atlanta as well as Delta TechOps, Delta's primary maintenance base. Boston – Delta's secondary transatlantic hub. Boston-Logan had been a Delta hub from the latter half of the 20th century to the early 2000s; the present Terminal A was built for Delta's sole use, but following the 2005 bankruptcy, Delta scaled back operations and leased 11 gates in the terminal. Delta subsequently regained all the Terminal A gates and began building up operations again in the mid 2010s, culminating in the reestablishing of BOS as a hub in 2019. Detroit – Inherited through the merger with Northwest, Detroit serves as one of Delta's two Midwest hubs and is Delta's second largest overall, it is the primary Asian gateway for the Eastern United States and it provides service to many destinations in the Americas and Europe.

Los Angeles – Delta's secondary West Coast hub. Delta inherited its LAX hub from Western Airlines, but dismantled it in the mid-1990s, opting to relocate most of those aircraft to the east coast. Since it has re-opened the hub, offering service to select cities in Latin America, Asia and Europe, as well as major domestic cities an

A web desktop or webtop is a desktop environment embedded in a web browser or similar client application. A webtop integrates web applications, web services, client–server applications, application servers, applications on the local client into a desktop environment using the desktop metaphor. Web desktops provide an environment similar to that of Windows, Mac, or a graphical user interface on Unix and Linux systems, it is a virtual desktop running in a web browser. In a webtop the applications, files, configuration and access privileges reside remotely over the network. Much of the computing takes place remotely; the browser is used for display and input purposes. The terms "web desktop" and "webtop" are distinct from web operating system, a network operating system such as TinyOS or distributed operating system such as Inferno. In popular use, web desktops are sometimes referred to incorrectly as web operating systems or WebOS. In the context of a web desktop, the term Webtop was first introduced by the Santa Cruz Operation in 1994 for a web-based interface to their Unix operating system.

This application was based on the provisional application entitled "The Adaptive Internet Protocol System" filed Nov. 13, 1997, serial number 60/065,521 and is the U. S. patent for the technology used in the Tarantella Webtop. Andy Bovingdon and Ronald Joe Record, who both explored the concepts in different directions, are credited as the inventors; the initial SCO Webtop, developed by Record, utilized a Netscape Navigator plugin to display applications in a browser window via TightVNC. A trademark application for "SCO Webtop" was filed with the U. S. Patent and Trademark Office on November 8, 1996. In order to avoid confusion with the more complex technology incorporated into the Tarantella Webtop it was abandoned on December 24, 1997 by The Santa Cruz Operation. Bovingdon's three tiered architecture concept was launched as the Tarantella Webtop; this technology originated from early commercial use of web server technology by SCO. the first OS vendor to include a commercial web server, NCSA HTTPd, commercial web browser, NCSA Mosaic.

Their X.desktop product line, obtained when they acquired IXI Limited in the UK, was the first to have icons for URLs and an HTML-based help system, called DeskHelp, which extended the NCSA Mosaic web browser to include APIs and scripting linked to the X.desktop product for interactive control. The IXI Limited scripting language based on Python was replaced with JavaScript. Tarantella allowed real UNIX and Windows applications to be displayed within a web browser through the use of Java to form a true web based desktop or Webtop; the first SCO Webtop releases were part of SCO Skunkware before being integrated into SCO OpenServer version 5 and UnixWare 7. Tarantella was subsequently purchased by Sun Microsystems and integrated into their Sun Secure Global Desktop. Byte magazine referred to the Webtop as a NUI. More Google released an operating system for web connection called Chrome OS and several 11-12" netbooks from Acer and Samsung have implemented the system, it is thought to represent a useful fraction of the current netbook sales.

Convenience A personalized desktop on every supported client device Mobility Access your desktop anywhere there is a supported client device Session management Server-side session management allows roaming users to access restored sessions from anywhere Software management Ensures all users are running the same current versions of all applications Updates and patches need only be applied to the server - no need to update multiple clients No need for software to distribute software over the networkSecurity Less prone to typical attacks, worms, unpatched clients, vulnerabilities Sensitive data stored on secure servers rather than scattered across multiple unprotected and vulnerable clients Encrypted transmission of all data between server and clients Software Management features accommodate quick and easy application of security advisories on server side Webtop administrator can control which applications and data each user is allowed to accessHigh availability From a single device access Windows, UNIX, Mainframe applications, all at the same time Minimal hardware requirements for client devices Less downtime - robust server system more protected and less to fail than multiple client desktops Fault tolerance - if a client device fails for any reason replace it with any other supported client device without loss of data, preferences, or application access Security Because all data is transferred over the internet, it might be possible for a cracker to intercept the connection and read data.

Although with the use of https 256-bit encryption and access control lists, this can be safe-guarded. Speed When using a web desktop the whole code used for visualization needs to be transferred to the local computer, so that it can be displayed. Further, network latency or congestion can intermittently slow webtop activity. Offline application storage can mitigate this issue. Application features Some webtop-delivered applications may not contain the full feature set of their traditional desktop counterparts. Network Access Web desktops require access to a network. If the client device is misconfigured or the network is unreachable the web desktop is unavailable. Controlled access In some webtop implementations and deployments a user's access to some applications and data can be restricted; this is considered an advantage of webtops but can be viewed as a drawb

Yang Le is a Chinese mathematician. He is a member of the Chinese Academy of Sciences. Yang was raised in Nantong, Jiangsu, his father, Yang Jingyuan, was a businessman and assistant manager of Nantong Tongming Electric Company. His mother was Zhou Jingjuan (周静娟）, he studied at the First Affiliated Primary School of Nantong Normal College and secondary studied at Nantong Middle School of Jiangsu Province. He was accepted to Peking University in 1956 and graduated in 1962. After college, he studied mathematics under Xiong Qinglai. at Chinese Academy of Sciences, started working there as a research scientist after the graduate program. He was elected a fellow of the Chinese Academy of Sciences in 1980. Yang married Huang Qieyuan, Huang Wanli's daughter