Thursday, December 29, 2011

HISTORY OF PEN

Ancient Indians were the first to use the pen. According to ancient text the earliest of pens made in India used bird feathers, bamboo sticks, etc. The old literature of Puranas, Ramayana and Mahabharta used this kind of pen roughly 500 BC. Ancient Egyptians had developed writing on papyrus scrolls when scribes used thin reed brushes or reed pens from the Juncus Maritimus or sea rush. In his book A History of Writing, Steven Roger Fischer suggests that on the basis of finds at Saqqara, the reed pen might well have been used for writing on parchment as long ago as the First Dynasty or about 3000 BC. Reed pens continued to be used until the Middle Ages although they were slowly replaced by quills from about the 7th century. The reed pen, generally made from bamboo, is still used in some parts of Pakistan by young students and is used to write on small boards made of timber.

The Quill pen was used in Qumran, Judea to write some of the Dead Sea Scrolls, which date back to around 100 BC. The scrolls were written in Hebrew dialects with bird feathers or quills. After the fall of the Roman Empire, Europeans had difficulty in obtaining reeds and began to use quills. There is a specific reference to quills in the writings of St. Isidore of Seville in the 7th century. Quill pens were still widely used in the 18th century, and were used to write and sign the Constitution of the United States in 1787.

Saturday, December 24, 2011

CHRISTMAS TREE

           The Christmas tree is a decorated evergreen coniferous tree, real or artificial, traditionally associated with the celebration of Christmas. It is brought into the home and decorated with Christmas lights (originally candles), ornaments, garlands, tinsel, and candy canes during the days around Christmas. An angel or star may be placed at the top of the tree, representing the host of angels or the Star of Bethlehem from the Nativity.

The earliest accounts of decorating an evergreen tree at Christmas were recorded in Livonia (modern-day Estonia and Latvia) in the 15th century.

The Christmas tree is sometimes called a Yule tree, particularly by those who wish to avoid Christian connections, but others explicitly distinguish between the two or identify the Yule tree with an undecorated evergreen tree

The custom of erecting a decorated Christmas tree can be historically traced back at least as far as 15th century Livonia and 16th century Northern Germany. According to the first documented uses of a Christmas tree in Estonia, in 1441, 1442, and 1514, the Brotherhood of Blackheads erected a tree for the holidays[clarification needed] in their brotherhood house in Reval (now Tallinn). At the last night of the celebrations leading up to the holidays,[clarification needed] the tree was taken to the Town Hall Square where the members of the brotherhood danced around it. In 1584, the pastor and chronicler Balthasar Russow wrote of an established tradition of setting up a decorated spruce at the market square where the young men “went with a flock of maidens and women, first sang and danced there and then set the tree aflame”. The Christmas tree became widely adopted by the Estonians themselves only in the 19th century.

Monday, December 19, 2011

CHRISTMAS CAROL

         A Christmas carol (also called a noël) is a carol (song or hymn) whose lyrics are on the theme of Christmas or the winter season in general and which are traditionally sung in the period before Christmas.
The first specifically Christmas hymns that we know of appear in fourth century Rome. Latin hymns such as Veni redemptor gentium, written by Ambrose, Archbishop of Milan, were austere statements of the theological doctrine of the Incarnation in opposition to Arianism. Corde natus ex Parentis (Of the Father's love begotten) by the Spanish poet Prudentius (d. 413) is still sung in some churches today.

In the ninth and tenth centuries, the Christmas "Sequence" or "Prose" was introduced in North European monasteries, developing under Bernard of Clairvaux into a sequence of rhymed stanzas. In the twelfth century the Parisian monk Adam of St. Victor began to derive music from popular songs, introducing something closer to the traditional Christmas carol.

In the thirteenth century, in France, Germany, and particularly, Italy, under the influence of Francis of Asissi a strong tradition of popular Christmas songs in the native language developed. Christmas carols in English first appear in a 1426 work of John Awdlay, a Shropshire chaplain, who lists twenty five "caroles of Cristemas", probably sung by groups of 'wassailers', who went from house to house. The songs we know specifically as carols were originally communal songs sung during celebrations like harvest tide as well as Christmas. It was only later that carols begun to be sung in church, and to be specifically associated with Christmas.

Sunday, December 18, 2011

HOW THE SANTA CAME..?

        THE CHRISTMAS IS COMING. AND THE SANTA IS COMING WITH GIFTS. DON'T YOU WANT TO KNOW WHO IS SANTA...?

        Santa Claus, also known as Saint Nicholas, Father Christmas, Kris Kringle, and simply "Santa", is a figure with legendary, historical and folkloric aspects who, in many western cultures, is said to bring gifts to the homes of the good children during the late evening and overnight hours of Christmas Eve, December 24. The modern figure was derived from the Dutch figure of Sinterklaas, which, in turn, may have part of its basis in hagiographical tales concerning the historical figure of gift giver Saint Nicholas. A nearly identical story is attributed by Greek and Byzantine folklore to Basil of Caesarea. Basil's feast day on January 1 is considered the time of exchanging gifts in Greece.

Santa Claus is generally depicted as a plump, jolly, white-bearded man wearing a red coat with white collar and cuffs, white-cuffed red trousers, and black leather belt and boots (images of him rarely have a beard with no mustache). This image became popular in the United States and Canada in the 19th century due to the significant influence of Clement Clarke Moore's 1823 poem "A Visit From St. Nicholas" and of caricaturist and political cartoonist Thomas Nast. This image has been maintained and reinforced through song, radio, television, children's books and films. The North American depiction of Santa Claus as it developed in the 19th and 20th century in turn influenced the modern perceptions of Father Christmas, Sinterklaas and Saint Nicholas in European culture

Saturday, December 17, 2011

HISTORY OF BOOKS

A book is a set or collection of written, printed, illustrated, or blank sheets, made of ink, paper, parchment, or other materials, usually fastened together to hinge at one side. A single sheet within a book is called a leaf, and each side of a leaf is called a page. A book produced in electronic format is known as an electronic book (e-book).
When writing systems were invented in ancient civilizations, nearly everything that could be written upon—stone, clay, tree bark, metal sheets—was used for writing.The study of such inscriptions forms a major part of history.The study of inscriptions is known as epigraphy. Alphabetic writing emerged in Egypt about 5,000 years ago. The Ancient Egyptians would often write on papyrus, a plant grown along the Nile River. At first the words were not separated from each other (scriptural continua) and there was no punctuation. Texts were written from right to left, left to right, and even so that alternate lines read in opposite directions. The technical term for this type of writing is 'boustrophedon,' which means literally 'ox-turning' for the way a farmer drives an ox to plough his fields.
Papyrus, a thick paper-like material made by weaving the stems of the papyrus plant, then pounding the woven sheet with a hammer-like tool, was used for writing in Ancient Egypt, perhaps as early as the First Dynasty, although the first evidence is from the account books of King Nefertiti Kakai of the Fifth Dynasty (about 2400 BC). Papyrus sheets were glued together to form a scroll. Tree bark such as lime (Latin liber, from which also comes library) and other materials were also used.
It shows that the invention of the books were before about 5000 of years. WHAT A FANTASY...?

Monday, December 5, 2011

WHAT A DEVELOPMENT....?

        Though ancient Indians were known to have knowledge about rocket science- it being used in during wars- it was only after independence that the process of exploring space really accelerated. India’s experience in rocketry began in ancient times when fireworks were first used in the country, a technology invented in neighbouring China, and which had an extensive two-way exchange of ideas and goods with India, connected by the Silk Road.

Military use of rockets by Tipu Sultan during the Mysore War against the British stimulated William Congreve to invent the Congreve rocket, predecessor of modern artillery rockets, in 1804. After India gained independence from British occupation in 1947, Indian scientists and politicians recognized the potential of rocket technology in both defence applications, and for research and development. Recognizing that a country as demographically large as India would require its own independent space capabilities and recognising the early potential of satellites in the fields of remote sensing and communication, these visionaries set about establishing a space research organisation.

Our first biggest success was on April 19, 1975, when India launched its first satellite into space. It was launched by the Soviet Union from Kapustin Yar using a Cosmos-3M launch vehicle. The ‘Aryabhata’ was named after a 5th century Indian mathematician, who founded concepts of the numerical value zero and many astronomical calculations in around 500 AD.

After that India has sent a number of satellites into space, notably the Apple (1981), Bhaskara –I (1979) and Bhaskara –II (1981), INSAT-1 series (1A, -1B, -1C and -1D), INSAT-2 series (2A, -2B, -2C and -2D), IRS-Series (1A, -IB, -1E, -P2, -1C, -P3, -1D), Rohini (1A, 1B, 2 and 3) and Sross.

Also, India has developed various Launch vehicles that make a space programme independent and are the most important technological measure of its advancement. Prominent among them are Satellite Launch Vehicle (SLV), Augmented Satellite Launch Vehicle (ASLV), Polar Satellite Launch Vehicle (PSLV), Geosynchronous Satellite Launch Vehicle (GSLV).

1960-1970:

Dr. Vikram Sarabhai was the founding father of the Indian space program, and is considered a scientific visionary by many, as well as a national hero. Once Sputnik was launched in 1957 he recognized the potential that satellites provided. India’s first Prime Minister, Jawaharlal Nehru, who saw scientific development as an essential part of India’s future, placed space research under the jurisdiction of the Department of Atomic Energy in 1961. The DAE director Homi Bhabha, who was father of India’s atomic programme, then established the Indian National Committee for Sapce Research (INCOSPAR) with Dr. Sarabhai as Chairman in 1962.

The Indian Rohini programme continued to launch sounding rockets of greater size and complexity, and the space programme was expanded and eventually given its own government department, separate from the Department of Atomic Energy. On August 15th 1969 the Indian Space Research Organisation (ISRO) was created from the INCOSPAR programme under the DAE, continued under the Space Commission and finally the Department of Space, created in June of 1972.

1970-1980:

The sixties had witnessed Sarabhai taking part in an early study with NASA regarding the feasibility of using satellites for applications as wide as direct television broadcasting, and this study had found that it was the most economical way of transmitting such broadcasts. Having recognized the benefits that the satellites could bring to India from the very start, Sarabhai and the ISRO set about designing and creating an independent launch vehicle, capable of launching into orbit, and providing the valuable experience needed for the construction of larger launch vehicles in future. The ISRO recognized the advanced capability India had in building solid motors with the Rohini series, and also that other nations had favoured solid rockets for similar projects, and set about building the technology and infrastructure for the Satellite Launch Vehicle (SLV). Inspired by the American Scout rocket, the vehicle would be a four-stage all-solid vehicle.

Aryabhatta – India’s first Satellite

Meanwhile, India began developing satellite technology anticipating the remote sensing and communication needs of the future. India concentrated more on practical missions, directly beneficial to people instead of manned space programs or robotic space explorations. The Aryabhata satellite, launched in 1975 from Kapustin Yar using a Soviet Cosmos-3M launch vehicle, was India’s first satellite.

SLV – India’s first Satellite Launch Vehicle

By 1979 the SLV was ready to be launched from a newly-established second launch site, the Satish Dhawan Space Centre (SDSC). The first launch in 1979 was a failure, attributed to a control failure in the second stage. By 1980 this problem had been worked out. The first indigenous satellite launched by India was called Rohini-1.

After successfully testing the first indigenous launch vehicle SLV-3 in 1980, ISRO built the next generation Augmented Satellite Launch Vehicle (ASLV). ISRO’s Launch Vehicle Programme had a giant leap with the successful launch of IRS-P2 spacecraft onboard the Polar Satellite Launch Vehicle (PSLV) in October 1994. On 18 April 2001, India successfully launched is Geosynchronous Satellite Launch Vehicle (GSLV). Technology development for advanced launch vehicles made good progress with the breakthrough achieved during the year in Supersonic Combustion Ramjet (SCRAMJET) to be employed in Air-Breathing engine. This is an important element in the launch vehicle technology development. Concepts for reusable launch vehicle are also being studied.

1980-1990:

Following the success of the SLV, ISRO was keen to begin construction of a satellite launch vehicle that would be able to put truly useful satellites into polar orbits. Design of the Polar Satellite Launch Vehicle (PSLV) was soon underway. This vehicle would be designed as India’s workhorse launch system, taking advantage of both old technology with large reliable solid-stages, and new liquid engines. At the same time, it was decided by the ISRO management that it would be prudent to develop a smaller rocket, based on the SLV, that would serve as a testbed for many of the new technologies that would be used on the PSLV. The Augmented Satellite Launch Vehicle (ASLV) would test technologies like strap-on boosters and new guidance systems, so that experience could be gained before the PSLV went into full production.

Eventually, the ASLV was flight tested in 1987, but this launch was a failure. After minor corrections, another launch was attempted in 1988, this launch again failed, and this time a full investigation was launched into the cause, providing valuable experience, specifically because the ASLV’s failure had been one of control – the vehicle could not be adequately controlled on removal of the stabilizing fins that were present on the SLV, so extra measures like improved maneuvering thrusters and flight control system upgrades were added. The ASLV development had also proven useful in the development of strap-on motor technology.

Indian National Satellite System

The Indian National Satellite (INSAT) system is one of the largest domestic communication satellite systems in the Asia-Pacific region. In the 1980s, it initiated a major revolution in India’s communications sector and sustained the same later. The satellites of INSAT system, which are in service today, are INSAT-2F, INSAT-3A, INSAT-3B, INSAT-3C, INSAT-3E, KALPANA-1, GSAT-2, EDUSAT and INSAT-4A, that was launched recently. The system provides a total of about 175 transponders in the C, Extended C and Ku-bands. Being a multipurpose satellite system, INSAT provides services to telecommunications, television broadcasting, weather forecasting, disaster warning and Search and Rescue fields.

INSAT system is also providing meteorological services through Very High Resolution Radiometer and CCD cameras on some of its spacecraft. This apart, cyclone monitoring through meteorological imaging and issue of warnings on impending cyclones through disaster warning receivers have been operationalised. For this, 350 receivers have been installed along the east and west coasts of India.

Indian Remote Sending Satellite System

India has the largest constellation of Remote Sensing Satellites, which are providing services both at the national and global levels. From the Indian Remote Sensing (IRS) Satellites, data is available in a variety of spatial resolutions staring from 360 metres and highest resolution being 2.5 metres. Besides, the state-of-the-art cameras of IRS spacecraft take the pictures of the Earth in several spectral bands. In future, ISRO intends to launch IRS spacecraft with better spatial resolution and capable of imaging day and night. The satellites of IRS system which are in service today are IRS-1C, IRS- ID, IRS-P3, OCEANSAT-1, Technology Experimental Satellite (TES), RESOURCESAT-1, and the recently launched CARTOSAT-1 capable of taking stereo pictures. The upcoming Remote Sensing Satellite are Cartosat-2, RISAT (Redar Imaging Satellite) and Oceansat-2.

1990-2000:

It was not until 1992 that the first successful launch of the ASLV took place. At this point the launch vehicle, which could only put very small payloads into orbit, had achieved its objective. In 1993 the time had come for the maiden flight of the PSLV. The first launch was a failure. The first successful launch took place in 1994, and since then, the PSLV has become the workhorse launch vehicle – placing both remote sensing and communications satellites into orbit, creating the largest cluster in the world, and providing unique data to Indian industry and agriculture. Continual performance upgrades have increased the payload capacity of the rocket significantly since then.

Under pressure, Glavkosmos halted the transfer of the associated manufacturing and design technology to India. Until then, ISRO had not been affected by technology transfer restrictions thanks to the political foresight of Sarabhai in indigenizing technology. However, elements of the ISRO management cancelled indigenous cryogenic projects in anticipation of the Russian deal. Instead of canceling the deal, Russia agreed to provide fully built engines instead, and India began developing an indigenous cryogenic engine to replace them, in the GSLV-II. There is still some controversy over the issue of the cryogenic engine acquisition, with many pointing to the decision to cancel indigenous projects as being a grave mistake – India would have likely had a fully indigenous engine operating by the time the GSLV launched if indigenous development had started from day one. Despite this one uncharacteristic slip in an otherwise extremely successful programme, and the loss of potential payload capacity over the decade that occurred as a result, ISRO pressed on.

2000-2010

Polar Satellite Launch Vehicle

The four stages PSLV is capable of launching upto 1,600 kg satellites into a 620 km polar orbit. It has provision to launch payloads from 100 kg micro-satellites or mini or small satellites in different combinations. It can also launch one-two class payloads into Geosynchronous Transfer Orbit (GTO). So far, it has performed nine missions with eight consecutive successes. The latest launch of PSLV (PSLV-C6) was on 5 May 2005 during which the vehicle precisely placed the 1560 kg CARTOSAT-1 and the 42 kg HAMSAT into a 620 km high polar SSO.

Geosynchronous Satellite Launch Vehicle

The GSLV was successful on its very first test flight. After its successful second flight on 8 May 2003, it was commissioned. This was followed by the success of its third flight on 20 September 2004. The GSLV is capable of launching 2,000 kg class satellites into Geosynchronous Transfer Orbit (GTO). The development of Indigenous cryogenic stage to be used as the third stage of GSLV made further progress during the year. The cryogenic engine which forms part of this stage, has already been successfully qualified. GSLV-Mk III, a new version of GSLV and capable of launching spacecraft weighing upto 4 tonnes to GTO is under development.

Infrastructure

An elaborate launch infrastructure exists at the Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota Island on the East Coast of India which is about 100 km from Chennai. Sriharikota is located at 13$dG North latitude. From here, satellites can be launched into a variety of orbital inclinations starting from 18$dG and extending upto 99$dG. Full-fledged facilities for satellite integration, assembly and launch exist there. Sriharikota also houses a Telemetry, Tracking and Command network for tracking satellites and monitoring them. The newly built Second Launch Pad at SDSE SHAR as a redundancy to the existing launch pad, and to cater to the requirement of GSLV-Mk III as well as other future launch vehicles, was commissioned on 5 May 2005 with the successful launch of PSLV-C6.

Currently the most powerful Indian launch vehicle in operation; the first development flight of the GSLV took place in 2001. The program’s benefits have been scrutinized due to frequent payload cutbacks and delays. The indigenous cryogenic engine for the GSLV’s upper stage was tested in 2007. ISRO has reconsidered the effectiveness of the GSLV for the needs of the 2000-2010 decade and began development of an indigenous and new heavy launch vehicle, GSLV III. The latter is not related to the GSLV-I/II and will be based around the proven format of liquid main stages and two solid strap-on boosters. It will resemble the Ariane 5 and other modern launchers and will have sufficient payload capacity for manned spaceflight. The inaugural flight is scheduled for 2008.

Chandrayaan 2008: ISRO intends to send a small robotic spacecraft into lunar orbit mounted on a modified PSLV. It will survey the surface of the moon in greater detail than ever before and attempt to locate resources. Countries, including the US have expressed interest in attaching their own payloads to the mission. ISRO and NASA have an agreement to carry two NASA probes as a payload.

AVATAR Scramjet: This is a long-term project to develop a reusable launch vehicle (RLV) restricted to the launch of satellites. Theoretically, AVATAR would be a cost effective launch vehicle for small satellites and therefore a commercially competitive launch system. A scaled-down technology demonstrator is scheduled to fly c.2008. Recently ISRO successfully tested a scramjet air breathing engine which produced Mach 6 for seven seconds. ISRO will continue research related to using scramjets in RLVs after 2010.

ISRO has entered the lucrative market of launching payloads of other nations. Prominent among them are the launches of Israel Space Agency’s, TecSAR spy satellite, and Israeli Tauvex-II satellite module. The CARTOSAT-2, launched on the July 2006, carried a small Indonesian payload of 56 kg.

Leveraging its expertise in cryogenic technology to design Hydrogen fuel cells to store and handling of hydrogen; ISRO teamed up with Tata motors to develop a prototype hydrogen passenger car for Indian market, expected to hit road by end of 2008.

On November 15, 2007 ISRO achieved a significant milestone through the successful test of indigenously developed Cryogenic Stage, to be employed as the upper stage of India’s Geosynchronous Satellite Launch Vehicle (GSLV). The test was conducted for its full flight duration of 720 seconds on November 15, 2007 at Liquid Propulsion test facility at Mahendragiri, in Tamil Nadu. With this test, the indigenous Cryogenic Upper Stage has been fully qualified on the ground. The flight stage is getting ready for use in the next mission of GSLV (GSLV-D3) in 2008.

On April 28, 2008 ISRO successfully launched 10 satellites in a single mission further boosting it’s capabilities in space.

This includes 690 kg CARTOSTAT-2 and another 83 kg mini Indian satellite, IMS-1; and eight other nano satellites made by various universities; and research and development institutions in Canada and Germany offered at a subsidized price as part of a goodwill gesture by the Indian Department of Space.

ANTRIX

Antrix, the commercial front of the Department of Space, is a single window agency for marketing Indian space capabilities. It is playing a key role in the worldwide availability or IRS data through Geoeye, USA. Antrix also provides IRS data processing equipment.

Antrix offers launch services using India’s PSLV. Two German, one Korean and one Belgian satellites have already been successfully launched by PSLV. Through Antrix, Telemetry, Tracking and Command support from the Indian ground stations are offered. Similarly, lease of transponders from INSAT system is possible. In this regard, 11 transponders have already been leased to INTELSAT. Customers for the spacecraft components offered by Antrix include world’s leading spacecraft manufacturers.

During the year, an agreement was entered into with EADS Astrium, Paris for the joint manufacture of 200 kg and 300 kg class satellite platforms for the telecommunications market. Besides, Antrix won contracts from Europe and Asia for launch services in the highly competitive international markets. After the successful development of a low cost, compact, modular and rugged Automatic Weather Station (AWS) in co-ordination with industry, the technology has been licensed to industry for regular production.

Thus, in addition to successfully developing spacecraft and launch vehicle technologies indigenously, India has also been successful in the application of satellite technology to benefit its national economy. At the same time, India has also been sharing space-based information with the international community and providing commercial space services globally.