0
Dates
Cool New Features
1G
70's to 80's
Wireless phones (cellular) are introduced, primarily for voice only.
2G
90's to 2000
Increased performance achieved by allowing multiple users on a single channel. More and more cellular phones are used for data as well as voice.
2.5G
2001-2004
The internet turns the focus towards data transmission. Enhanced multimedia and streaming video are now possible. Phones support limited web browsing.
3G
2004-2005
Enhanced multimedia and streaming video capabilities are increased. Standards are created to allow universal access and portability across different device types (Telephones, PDA's, etc.)
4G
2006+
Speeds reach up to 40 Mbps. Enhanced multimedia, streaming video, access and portability are increased still further. Devices are equipped for world-wide roaming.
Technology
1G
Analog
CMRT
AMPS
2G
Digital Circuit Switched
D-AMPS
GSM
CDMA
2.5G
Digital Packet Switched
GPRS
EDGE
3G
Digital Packet Switched
UMTS
W-CDMA
CDMA2000
4G
Digital Broadband
802.11
Data Rate
1G
9.6 Kbps to 14.4 Kbps
2G
D-AMPS
9.6 Kbps to 14.4 Kbps
GSM
9.6 Kbps to 14.4 Kbps
IS95A
9.6 Kbps to 14.4 Kbps
IS95B
115 Kbps
2.5G
56 Kbps to 144 Kbps
3G
UMTS
2+ Mbps, up to 384 Kbps
WCDMA
384 Kbps (wide area access), 2 Mbps (local area access)
CDMA2000
614 Kbps
4G
20-40 Mbps
Frequency
Carrier
1G
800 MHz
30 kHz
2G
D-AMPS
800 MHz or 1.9 GHz
30 kHz
GSM
800 MHz or 1.9 GHz
200 kHz
IS95A/B
800 MHz or 1.9 GHz
1.25 MHz
2.5G
800 MHz or 1.9 GHz
200 kHz
3G
UMTS
2 GHz
5 MHz
WCDMA
2 GHz
5 MHz
CDMA2000
2 GHz
1.25 MHz / 3.75 MHz
4G
In Development
In Development
Primary Countries
1G
Worldwide
2G
D-AMPS
USA
GSM
IS95A/B
USA
2.5G
Europe, Asia, USA
3G
Europe, Japan, USA
4G
In Development
Wiki User
∙ 11y ago
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What is the welding sequence for a 1G weld?
There are many different factors that may determine welding sequence. Of course, a 1G weld is defined as a Flat (1) Groove (G) weld and the 1G is usually used when describing the position of welding any flat material such as bar, sheet, or plate. The thickness of the material may affect sequence. For 3/16" (some may say 1/4") thick material, one pass is utilized to fill the joint. Most codes will limit per pass thicknesses to 1/4" thick depending on the process used, but when welding 1/4" thick material the likliness of incomplete penetration, incomplete fusion, or excessive undercut at the toes of the face side of the joint are very high, which results in most 1/4" material to be welded using 2 passes (multipass). Another factor may be the end result of the material being welding, such as minimal distortion which is a result of heat input. Weaving will reduce the number of welds that are needed but will result in longer 'on time' of the heat input and will increase the amount of heat input to the base metal. A good, fool proof way of welding a flat groove weld is to always work from back to front (when multipass welding) which always allows for proper tie in or penetration of the weld metal either into the base metal or to each prior pass.
What is a welding positioner?
A welding positioner is a work motion device that places the weldment in a location and at an angle that allows for optimum welding parameters to be used (faster travel speed, increased current, ect.) Essentially, it places the weldment so that it is in a 1G, 1F, or 2F position. Four common types of welding positioners include tilt-tables, turning rolls, head and tailstock, and universal balance positioners.
How do you use sub string in java?
Substring method creates smaller string form bigger string , every time a new string is created but original character array buffer is used. so even if original string is 1G in size and substring is just 1K memory held by substring is 1G because of backed array. this can cause memory leak and prevent original string from garbage collection even if there is no direct reference.
What are the Main differences between object oriented programming and generations 1-4 programming language?
Object oriented computer programming and design methodology has become popular as a way of modeling and solving many programming problems. Traditionally, the implementation of such systems has been performed using an object oriented programming language such as C++. Those skilled in the art know that object oriented programming languages share at least five unique and defining concepts or notions. These concepts, which are discussed fully in the relevant literature pertaining to object oriented programming, are known as: CLASSES, OBJECTS; INHERITANCE; POLYMORPHISM, and ENCAPSULATION. Objects communicate with one another via "message passing." A "message" is texts string such as "redraw you". When an object receives a message, a corresponding class method is executed. It is well-known that in object oriented programming, different objects of an object oriented programming language will respond to messages differently.Shift from top-down to OOP could be called going from fourth to fifth generation, in that what it enables programmers to do better or more conveniently than they could with the more primitive languages resembles what the higher generation languages enabled them to do over the lower generation ones. OOP, however, is a paradigm shift as significant as that from first to second or, arguably, from second to third -- but far more radical than the from third to fourth. Of course, it is impossible to quantify this, but in terms of ease of programming and what OOP enables, it might be fair to say the leap from fourth-generation languages to OOP, especially what OOP has now become, can be likened to the span between binary code and BASIC. OOP supercharges the program environment.At each generational jump from binary to assembly language, to third-generation, to fourth-generation, the leap made programming easier and enabled more complex tasks by adding layers around the central core of binary code and its next outer layer, assembly. All programming languages including the advanced OOP iterations that are out now, are parsed down to binary to be executed by the computer. It's all fundamentally the same.OOP packaged the laborious and error-prone systems of calling subroutines with variable parameters we used in the old days with a very slick interface, an envelope of error-checking and ease of use.Object Oriented Programming organizes programming logic around objects instead of processes (as is the case with non-OOP). Some widely used third generation, object-oriented programming languages include C++, Java, and Smalltalk. In OOP, data, and the processes that can be performed on the data, are combined into an object. In addition, objects with similar characteristics may be combined into something called a class. So when an OOP programmer creates a class and wants to categorize certain files they are able to create a sub-class. Sub-classes inherit all the characteristics and processes from the original class file that it is derived from. Inheritance is one of the most powerful features of OOP. Once a programmer creates the subclass, he can add to or change the characteristics and processes to meet the precise needs of the subclass. An example of an OOP is Microsoft Office Suite products (Word, Excel, PowerPoint, Access). First Generation Programming is a machine language. It only understands zeros and ones, so we say machine languages are binary. Second Generation Programming is also called assembly languages; it uses simple words in place of zeroes and ones. The programmer associates each assembly language statement with a specific machine language command. Third Generation Programming uses source codes that could then convert into machine language. A special computer program, called a compiler, would handle the conversion. A compiler is a computer program that translates a specific third generation language (3GL) into machine language. Forth Generation Programming languages are closer to natural language. People who have little or no programming skills can use them to write simple programs. One example of a 4GL is structured query language (SQL). Structured query language is a standard language for manipulating databases. Users can write simple SQL programs to create a database, enter data, retrieve data, and delete data. How are they similar? All programming languages still go back to the First Generation Programming language, Each generation has become more advance, with better tools and features. But each language resorts to machine language.
Who invented 1g technology?
dick winington
What is 1g2g3g4g technology?
1g 1st Generation, 2g 2nd Generation and so on. Refers to version of technology.
What is the difference between 1G 2G 3G generations of wireless communication?
1G is based on frequency modulation,analog technology,TDMA 2G is based on digital technology,FDMA 3G is based on CDMA which is a faster internet access source
Can you install ios 5 on iPhone 1g?
lol no, the technology is way too old to handle it
Is the iPod 1g the same as iPod first generation?
1g is not the same as 1st gen. there's no 1g ipods.
How many 25cg is equal to 1g?
it is equal because 1g
How much is 1g equals in mg?
1g=1000mg Aabid
How many gigabytes equals 500?
This is easy... You could easily search the conversion chart on Google and do the math. But people are lazy. Anyway.. There are 1024MB/1G So.. Simple math.. 1024*500 = 512,000MB.
Which is larger 1g or 1cg?
1 gram or 1 cg
Which is greater 1kg 1g or 1mg?
1ML === ===
The price of 1g of Yttrium?
The price of 1g of Yttrium is 1 cent.
How many calories do you have to burn to burn 1 gram of cargs?
1g of carbohydrate = 4 calories 1g of protein = 4 calories 1g of fat = 9 calories 1g of alcohol = 7 calories
