MIXED BAG

 BY  Pragyansharma  Polavarapu THE  RESEARCH  FINALLY RESULTED IN CREATION OF THE MOST BEAUTIFUL “MICROS” (DESKTOP/LAPTOP/DIGITAL PHONE ) 1) Metals(both elements and alloyed metals) are best conductors of the electric current. When metal objects are put in current circuits there is a flow of billions of electrons in a systematic way from negative electrode to positive electrode through the wire circuit. This is because the electrons in outermost orbits in the atoms jump out and form a stream towards positive pole. But some of the electrons from the billions in the stream jump back into outer orbits every moment and keep the atoms perfectly neutral. The stream of electrons moves at violent speed . The electric impulse travels at unbelievable speed of nearly 300,000 kilometers per second! (2)Nonmetals ( like carbon, sulphur, silicon etc ) , organic and compound substance like glass, stone, wood, plastic   etc do not   conduct electricity.  ...

BY pragyansharma polavarapu  PART ONE     A SIMPLE VIEW OF A  SOFTWARE PROGRAM Before coming of WINDOWS software, the  commands to CPU were always given through software instructions which were like precise coded commands of a military office. After coming of WINDOWS programming environment many  software actions  are performed   “graphically” i.e. by clicking  small picture buttons( icons  ) or  flag like vertical menu lists or by using the conversational style in dialogue boxes etc. While using dialogue boxes , no sooner we give an answer to a question ,another question pops up. After two or three such questions the computer is satisfied with our answer.This is really interactive programming of high quality.  The  “icons”( little  half centimeter size pictures in square boxes ) appear  in   tool bars/task bars at top and bottom of WINDOW.  ...

  By    pragyansharma polavarapu  INTRODUCTION (1) The MINI  computers not only brought down the size of computer (to size of a table top radio) but various new technologies were also introduced making the computer all powerful.  The  length of “computer word”(the “bytes” conmprising a string of 0s and 1s ) was standardized to  8/16/32 bit size by  the IEEE. Many  sophisticated computer languages BASIC/FORTRAN/COBOL  etc  with a mathematical base  were invented. Use of computer naturally  extended to many  fields . (2) Mini  in the client-server environment was useful for bank counter supervision ,college teaching with live question-answer sessions between the professor and student ,ticket booking counters  , government work etc. Client server technology had another big use in industries especially industries dealing with hazardous chemicals or industries where live watching minute by minute...

  By    pragyansharma polavarapu    (A)INTRODUCTION (1)The  MINI computers of 1960s and 1970s were  really  very small  compared to the old giant electronic calculating machines like ENIAC of 1940s . The old electronic  calculator-computer machines like the respected ENIAC   were of the size of  big halls in houses. Wonder of wonders,the MINIs  of 1960 and 1970s became reduced to the  size of  just  table-top band radios! The transformation was made possible solely after the discovery of  tiny sand particle-sized  “TRANSISTOR” (silicon triode) and its use  in the MINIs .  Hundreds or even thousands  of transistor  triodes were used in creation of  hundreds of logic circuits in registers and processors inside the computer. (2)The transistor was invented in 1947 after a series of researches on tiny “crystal diodes” made from semiconductor materials like Germanium and S...

 By    pragyansharma polavarapu    AN INTRODUCTION (1) Earlier to 1950s computers were only  giant size mathematical calculators . A  single machine occupied a big  hall with its 10-15 cabinets of electrical /electronic equipment and connecting wires. However  they could do a million calculations like 2+3 in just a millionth of second! They had awe inspiring calculating power and were mysterious machines. After discovery of sand-grain sized transistor triodes there was a sea change in computer production technology. The tiny sturdy high performance transistors replaced the  15,000 big electric bulb sized glass diodes in computer’s logic circuits ! Computers became small  like radio sets (old tube radios of 60 years back) requiring only a small office table in a small room.  During the period of about three  decades, roughly  1960s to 1980s ,  small computers(electronic calculating machines...