There are also the European Union Galileo positioning system and Chinas BeiDou Navigation Satellite System, special and general relativity predict that the clocks on the GPS satellites would be seen by the Earths observers to run 38 microseconds faster per day than the clocks on the Earth.https://izageron.tk/4192-leo-18-february.php
The GPS calculated positions would quickly drift into error, accumulating to 10 kilometers per day, the relativistic time effect of the GPS clocks running faster than the clocks on earth was corrected for in the design of GPS. It used a constellation of five satellites and could provide a navigational fix approximately once per hour, in , the U.
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Navy developed the Timation satellite, which proved the feasibility of placing accurate clocks in space, a technology required by GPS. In the s, the ground-based OMEGA navigation system, based on comparison of signal transmission from pairs of stations. Limitations of these systems drove the need for a more universal navigation solution with greater accuracy, during the Cold War arms race, the nuclear threat to the existence of the United States was the one need that did justify this cost in the view of the United States Congress.
This deterrent effect is why GPS was funded and it is also the reason for the ultra secrecy at that time.
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Announced in June and released in September, it was the first and it was initially released in three colors, black, cyan and magenta, before a white version was announced at Nokia World Despite a limited release, the N9 received widespread critical acclaim and it was praised for both its software and hardware, including the MeeGo operating system, buttonless swipe user interface, and its high-end features. The successor of Nokia N, internally known as N, was scheduled to be released in late , pictures of the prototype leaked in August showed an industrial design and a 4-row keyboard.
A software engineer working for Nokias device division cited the N in the bug tracker for Qt. This would later be known as the N and this design was dropped, then Nokia started working on the N, codenamed Lankku, a new variant without a keyboard. Nokia N9 was announced on 21 June at the Nokia Connection event in Singapore, at the time, the phone was presumed to become available to the public in September Users can get notified via e-mail of the availability of N9 in their country at the webpage of the Nokia Online Store, the N9 was announced only four months after partnering with Microsoft to use Windows Phone 7 as the flagship operating system to replace Symbian.
They responded by creating a petition We want Nokia to keep MeeGo, despite the success of the alliance, it was broken and MeeGo canceled by Stephen Elops decision. Intel officially expressed regrets because of this situation, Elop restated that the company will not be continuing development of MeeGo even if the N9 would be a success, focusing solely on the future Lumia series.
In August , Nokia announced that Nokia N9 will not be released in the United States, other reports indicated that the device will not be available in other markets such as Japan, Canada and Germany. Nokia posted on the blog in the last week of September that N9 phones are heading to the stores. In January , they were made available in some major stores of the Saturn Media Markt chain.
Traffic flow — Nonetheless, even with the advent of significant computer processing power, to date there has been no satisfactory general theory that can be consistently applied to real flow conditions. Current traffic models use a mixture of empirical and theoretical techniques, Traffic behaves in a complex and nonlinear way, depending on the interactions of a large number of vehicles. Some mathematical models of traffic flow use a vertical queue assumption, in a free-flowing network, traffic flow theory refers to the traffic stream variables of speed, flow, and concentration.
These relationships are mainly concerned with uninterrupted traffic flow, primarily found on freeways or expressways, Flow conditions are considered free when less than 12 vehicles per mile are on a road. Stable is sometimes described as 12—30 vehicles per mile per lane, as the density reaches the maximum flow rate and exceeds the optimum density, traffic flow becomes unstable, and even a minor incident can result in persistent stop-and-go driving conditions.
A breakdown condition occurs when traffic becomes unstable and exceeds 67 vehicles per mile, jam density refers to extreme traffic density when traffic flow stops completely, usually in the range of — vehicles per mile per lane. However, calculations about congested networks are complex and rely more on empirical studies. Because these are urban or suburban in nature, other factors also influence the optimum conditions. There are common spatiotemporal features of traffic congestion that are qualitatively the same for different highways in different countries.
Some of these features of traffic congestion define synchronized flow. Traffic flow is generally constrained along a one-dimensional pathway, a time-space diagram shows graphically the flow of vehicles along a pathway over time. Time is displayed along the axis, and distance is shown along the vertical axis.
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Traffic flow in a diagram is represented by the individual trajectory lines of individual vehicles. Vehicles following each other along a given travel lane will have parallel trajectories, time-space diagrams are useful tools for displaying and analyzing the traffic flow characteristics of a given roadway segment over time. There are three variables to visualize a traffic stream, speed, density, and flow. Speed is the distance covered per unit time, one cannot track the speed of every vehicle, so, in practice, average speed is measured by sampling vehicles in a given area over a period of time.
Two definitions of average speed are identified, time mean speed, time mean speed is measured at a reference point on the roadway over a period of time. In practice, it is measured by the use of loop detectors, loop detectors, when spread over a reference area, can identify each vehicle and can track its speed. Audi — Audi is a German automobile manufacturer that designs, engineers, produces, markets and distributes luxury vehicles. Audi is a member of the Volkswagen Group and has its roots at Ingolstadt, Bavaria, audi-branded vehicles are produced in nine production facilities worldwide.
After relaunching the Audi brand with the introduction of the Audi F series, Volkswagen merged Auto Union with NSU Motorenwerke in , the company name is based on the Latin translation of the surname of the founder, August Horch. Horch, meaning listen in German, becomes audi in Latin, the four rings of the Audi logo each represent one of four car companies that banded together to create Audis predecessor company, Auto Union.
Audi, along with BMW and Mercedes are among the luxury automobile brands in the world. Originally in , automobile company Wanderer was established, later becoming a branch of Audi AG, another company, NSU, which also later merged into Audi, was founded during this time, and later supplied the chassis for Gottlieb Daimlers four-wheeler. On 14 November , August Horch established the company A. His former partners sued him for trademark infringement, the German Reichsgericht in Leipzig, eventually determined that the Horch brand belonged to his former company.
Since August Horch was prohibited from using Horch as a name in his new car business, he called a meeting with close business friends, Paul and Franz Fikentscher from Zwickau. At the apartment of Franz Fikentscher, they discussed how to come up with a new name for the company, during this meeting, Franzs son was quietly studying Latin in a corner of the room. The idea was accepted by everyone attending the meeting. Audi started with a 2, cc inline-four engine model Type A, followed by a 3, cc model and these cars were successful even in sporting events.
It is one of the luxury automakers in the world. BMW was established as a business entity following a restructuring of the Rapp Motorenwerke aircraft manufacturing firm in named Aerowerke Gustav Otto, after the end of World War I in , BMW was forced to cease aircraft-engine production by the terms of the Versailles Armistice Treaty. The company consequently shifted to production as the restrictions of the treaty started to be lifted in BMWs first significant aircraft engine, and commercial product of any sort, was the BMW IIIa inline-six liquid-cooled engine of , known for good fuel economy, with German rearmament in the s, the company again began producing aircraft engines for the Luftwaffe.
The first-ever four-engine jet aircraft flown were the sixth and eighth prototypes of the Arado Ar jet reconnaissance-bomber. Which was won by the Heinkel He Spatz design, the BMW aviation turbojet was also under consideration as the basic starting point for a pioneering turboshaft powerplant for German armored fighting vehicles in —45, as the GT By the year , the division of BMW was in financial difficulties.
It was decided to carry on by trying to cash in on the current economy car boom exploited so successfully by German ex-aircraft manufacturers such as Messerschmitt, BMW bought the rights to manufacture the Italian Iso Isetta.
Glas vehicles were badged as BMW until the company was fully absorbed. However, this factory was outmoded and BMWs biggest immediate gain was, according to themselves, the Glas factories continued to build a limited number of their existing models, while adding the manufacture of BMW front and rear axles until they could be closer incorporated into BMW. Microsoft — Its best known software products are the Microsoft Windows line of operating systems, Microsoft Office office suite, and Internet Explorer and Edge web browsers. Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface tablet lineup, as of , it was the worlds largest software maker by revenue, and one of the worlds most valuable companies.
The companys initial public offering, and subsequent rise in its share price, since the s, it has increasingly diversified from the operating system market and has made a number of corporate acquisitions. The word Microsoft is a portmanteau of microcomputer and software, Paul Allen and Bill Gates, childhood friends with a passion for computer programming, sought to make a successful business utilizing their shared skills.
In they founded their first company, named Traf-O-Data, which offered a computer that tracked and analyzed automobile traffic data. Allen went on to pursue a degree in science at Washington State University. Since they didnt actually have one, Allen worked on a simulator for the Altair while Gates developed the interpreter and they officially established Microsoft on April 4,, with Gates as the CEO. Allen came up with the name of Micro-Soft, as recounted in a Fortune magazine article. Due to various factors, such as MS-DOSs available software selection, the company expanded into new markets with the release of the Microsoft Mouse in , as well as with a publishing division named Microsoft Press.
Car2Go — Car2go is a German car rental company. It is a subsidiary of Daimler AG providing carsharing services in European, the company offers exclusively Smart Fortwo and Mercedes-Benz vehicles and features one-way point-to-point rentals. Users are charged by the minute, with hourly and daily rates available, the service forgoes the typical centralized rental office, and cars are user-accessed wherever parked via a downloadable smartphone app.
As of October , car2go is the largest carsharing company in the world with over 2,, members. Daimler introduced the service in Ulm, Germany, in October , as of October , car2go operates over 14, vehicles, which serve eight countries and 30 cities worldwide with over 2,, customers. Due to a lack of charging stations, car2go in San Diego, California, when the service started in , car2go expected 1, charging stations to be deployed around the city, but only were in place by early The company charges a per minute rate, with discounted fixed rates for hourly and daily usage also available, the rates are all-inclusive and cover rental, gas, insurance, parking, and maintenance.
A low fixed annual fee is also charged. In most markets, car2go vehicles can park in either specially designated parking spots, or in parking areas. In most cities, car2go offers only two-passenger vehicles, namely two types of Smart Fortwo car2go edition vehicles, gasoline-powered, and electric-powered. Electric car2go models are available in several markets, have a range of 84 miles. In its Canadian markets, car2go has a program in place to supplement its fleet with a small number of four-door Mercedes B-class vehicles.
First-party and third-party apps for mobile devices allow users to locate, carsharing Official website Daimler Mobility Concepts. World Wide Web — The World Wide Web is an information space where documents and other web resources are identified by Uniform Resource Locators, interlinked by hypertext links, and can be accessed via the Internet.
The World Wide Web has been central to the development of the Information Age and is the primary tool billions of people use to interact on the Internet, Web pages are primarily text documents formatted and annotated with Hypertext Markup Language. In addition to formatted text, web pages may contain images, video, audio, embedded hyperlinks permit users to navigate between web pages.
Multiple web pages with a theme, a common domain name. Aruba http: Norte do Brasil http: Alberta http: Alabama http: Armenia http: Anhui http: Australia http: Northwestern Federal District http: Alsace http: Abruzzo http: Andhra Pradesh http: England http: Email This BlogThis! Share to Twitter Share to Facebook. Now Ziddu On Mobile. All free accounts! No Premium accounts!! Accepts parallel downloads! Invite, Make and Share the joy and files with your Friends. HERE WeGo formerly provided text-to-speech "Hi-Fi" navigation voices on Android, but eliminated them to focus on "bringing a larger variety of good quality voices instead of handful of Hi-Fi voices.
Public transport data is displayed by the HERE app whilst planning a route while online, for transport options such as buses and trains. Walking  and cycling  routes are also supported. Time and distance estimates are provided for these modes, and driving navigation. In late June Here added real-time traffic for reversible express lanes across the United States and Europe.
Users can save the location and details of destinations as 'Collections' if they are online and signed in. Location sharing and tracking was previously provided by Glympse, integrated into the app. Here WeGo can download maps of countries to internal storage, so that a data connection is not needed for navigation. Online usage provides live traffic data and additional venue information. The maps include floor-by-floor details of some large indoor venues such as shopping malls and airports.
There is a Web page "HERE car drive schedule - Drive schedule for our map data collection cars", with entries typically for the current and next month . Statistics published by HERE state that it reached 1,, downloads on the Android platform a couple of weeks after launch and, 12 weeks after its launch, reached 2. The latest, and the last, Version 3.
Nokia stated that the Nokia from would be the last Symbian phone;  Symbian development then stopped. Accenture was responsible for maintenance of Symbian and Nokia Maps until Maps for S40 were limited compared to other platforms. The maps were streamed online into the device or pre-downloaded with Nokia Suite.
In some markets the phones were sold with an SD card preloaded with local maps. The system did not support turn-by-turn navigation. From Wikipedia, the free encyclopedia.
Your personal navigation system
Web mapping and navigation service. This article is about the maps and navigation application. For the mapping company, see Here company.
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