Category Scientist & Invensions

Vinod Johri

Vinod Johri

Vinod Johri (10 June 1935) was an Indian astrophysicist. He was an eminent cosmologist, a retired professor of astrophysics at Indian Institute of Technology, Madras and an emeritus professor at Lucknow University since 1995. Johri had over 75 research publications and articles published in pioneering journals. His major contributions in cosmological research included ‘power law inflation, genesis of quintessence fields of dark energy and phantom cosmologies’. He was the co-author of the first model of power law inflation in Brans–Dicke theory along with C. Mathiazhagan. He was honored by Uttar Pradesh Government by Research Award of the Council of Science & Technology (CSIR).

Institution 

  • Indian Institute of Technology
  • Lucknow University
  • Gorakhpur University
  • Allahabad University

Fields

  • Astrophysics
  •  Physics
  •  Cosmology

Johri spent over 45 years researching in cosmology, acting as a research guide and principal investigator of various research projects of Council of Scientific and Industrial Research, Department of Science & Technology and University Grants Commission of India. Johri was a Commonwealth Fellow, a senior visitor at Cambridge University (UK) and a Fellow of Royal Astronomical Society of London. He worked as consultant for UNESCO at United Nations Development Program[6] in Iran and as a DAAD Fellow at University of Mainz (Germany), as a visiting scientist at Hansen Lab (Gravity Probe B Group) Stanford University (USA) and as an International Scholar at Fine Theoretical Physics Institute at University of Minnesota at Minneapolis (USA). He died in Dallas, USA at the age of 78 due to complications arising from Kidney failure.

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Who developed the shorthand?

          Shorthand is a system of writing fast using characters, abbreviations or symbols for letters, words or phrases. Other names for shorthand are stenography (little or narrow writing), tachygraphy (swift writing) and brachygraphy (short writing). Because of its obvious usefulness, today it is widely used in business, industry and other professions of the world.

          Most historians trace back the origin of shorthand to the Greek historian Xenophon who used an ancient Greek system to write the memoirs of Socrates. Marcus Tullius Tiro of Rome invented the Latin shorthand far back in 63 B.C. He also compiled a dictionary of shorthand. 

          However, the systematic development of shorthand took place in the 17th century. John Willis is considered the father of modern shorthand. Later the industrial developments brought in a demand for stenographers in the business. During the 18th century several shorthand systems were developed but the one developed by the English stenographer Samuel Taylor in 1786 was adapted in French, Spanish, Portuguese, Italian, Swedish, German, Dutch, Hungarian and other languages. Sir Isaac Pitman developed the modern system based on Taylor’s system in 1837. It consisted of 25 single consonants, 24 double consonants and 16 vowel sounds.

          Irish born John Robert Gregg developed another system in 1888 which was based on circles, hooks and loops. In 1893 this system was introduced in U.S.A. In the present century rapid strides have been made in this field.

           Nowadays many machines are also available which can record fast speeches. Stenotype machine was invented by Ward Stone Ireland, a U.S. stenographer and court reporter, around 1906. This machine is used for recording speeches. It is especially employed for conference and court reporting.

When was the stethoscope invented?

           A stethoscope is a device used by physicians to listen to the sounds inside the body. Generally, these sounds originate from the heart, lungs, abdomen and the blood vessels. Very often valuable information about the disorders in certain parts of the body can be obtained through observing the change in sounds. For instance, a change in the sounds made by the rushing of blood through the heart valves or by the closing of valves may give important clues to different heart diseases. Similarly, an abnormality in the sounds made by air in the windpipe and airways in the lungs may indicate certain lung disorders.

           Stethoscope was invented by a French doctor, Rene T.H. Laennec, in 1815. It was a one-foot-long hollow wooden cylinder. He put one end of the cylinder on to his patient’s chest and listened to the sounds produced by the heart and the chest through the other end. As he compared such sounds from different patients, he could reach certain conclusions. In 1819, he published these conclusions in the form of a book entitled, De L’ Auscultation Mediate, and soon stethoscope came into general use.

            Since those days, many modifications have been made in its design. A modern stethoscope basically consists of a contact piece called the chest piece. This can be a flat chest piece for high-pitched sounds or a bell-shaped open-ended chest piece for low-pitched sounds. It conducts sounds through two flexible rubber or plastic tubes to a pair of ear pieces which fit into the physician’s ears and excludes other sounds. The chest piece is put in contact with the different parts of the chest and the back. Now, through these sounds the physician gets valuable clues regarding the different diseases the patient might be suffering from. The stethoscope is still the simplest and the most useful means available to doctors to examine the lungs and heart. 

How did the circus begin?

          The Romans were the first to use the word ‘circus’ in the first century B.C. The large open area was called ‘The Circus Maximus’. Here the main attraction was a chariot race. The drivers wore helmets and were wrapped in lengths of bright coloured flowing clothes. The ground was so large as to accommodate around 1, 50,000 people. In those days Rome had other kinds of entertainments also. Jugglers, acrobats, rope-walkers and animal-trainers also entertained people in many ways.

          Eventually all those feats became part of what we call ‘circus’ today.

          After the fall of the Roman Empire, circus went into oblivion for many centuries. The first modern circus came into being in England in 1768, when Philip Astley turned into a trick rider, and he traced the first ring. The name circus was first used in 1782 when the Royal Circus was set up by Charles Hughes. Many showmen found a new outlet in the circus, as did the rope dancers, acrobats, jugglers and others, where it could be seen clearly that nothing was faked. Hence they got much popularity. In the first half of the 19th century many circus sprang up even in the United States.

          Circus is a popular means of entertainment today. It is universally loved by the young and the old. In the modern circus we see many amazing feats like rope-walking, wire-cycling, fire-eating, weightlifting, trapeze and innumerable animal and bird games. Jugglers, acrobats and clowns join in to add to the entertainment.

          The world’s largest permanent circus is Circus Las Vegas, Nevada, U.S.A. This was opened on 18 October, 1968. It covers an area of 11,984 sq. mts. The largest travelling circus is the Gold Unit of Ringling Bros. and Barnum & Bailey Circus. It was used for a show at Sapporo, Japan on 1 July 1988. The largest circus crowd comprised of 52,385 people who attended the performance of “The Greatest Show on Earth” in New Orleans, USA on 14 September, 1975. 

 

Who discovered Australia?

          Australia is the smallest continent but the largest island (piece of land covered with water from all sides) of the world. Its total area is about 8,000,000 sq. km (3,000,000 sq. miles). People during the medieval times talked about the existence of a large continent in the Southern Hemisphere. No one had seen it and people wondered what it was like and whether it was inhabited at all. It was called the ‘unknown southern land’.

          During the 16th century, European countries had been seeking new lands in order to expand their commercial activities. In 1606 the Dutch were the first to visit Australia. Their ship called the ‘Dnyffkin’ anchored off the Northern coast of Australia. When some of its crew went ashore to refill their water casks, they were driven out by the fierce natives. The Dnyffkin sailed away without exploring any other part of the vast continent.

          In 1642 Captain Abel Tasman was sent by the Dutch to explore more about the continent. He sighted the west coast, which he called Van Diemen’s Land (Tasmania). Later he explored New Zealand. In 1770 the English Captain James Cook discovered the South Eastern coast of Australia and named it New South Wales. In 1788 the first English colony was established in the city of Sydney.

          Who, then, were the first inhabitants of Australia?

          Before the arrival of Europeans in the late 18th century the country was first inhabited by the Aborigines who reached Australia from Southern Asia about 20,000 years ago. In 1870 there were about 300,000 Aborigines in Australia. They arrived in two groups; the first group was eventually driven from the south-east into Tasmania; the second was racially quite different which occupied the rest of Australia.

          Today, Australia is among the highly developed countries of the world. Its inhabitants are self-sufficient in almost every respect. It has many distinctive features. Two-third of its land is a desert. It is, however, rich in minerals like gold, tungsten, manganese, cobalt, lead and zinc. Its unique wild life includes animals like kangaroo, koala and birds like emu, black swan. The plants like giant eucalyptus and bottle tree are found here in abundance.

 

Who invented the shoes?

          The primitive man who lived in caves had to make his way through rocks. To protect his feet he probably covered them with bags of grass, strips of animal hide or even flat pieces of wood. These were fastened to the soles of the feet by crude thongs (crude straps) bound around the ankles. These were the first shoes.

          Among the civilized people, Egyptians were the first to make shoes. They used pads of leather or papyrus (a tree with thick stem) which were bound to the feet with two straps. In order to protect the toes, its front was sometimes turned up. Samples of shoes, made around 2000 B.C. have been found in Egypt.

          In some cold countries, people developed a different kind of shoes. They were bags padded with grass and tied around the feet. 

         As far as the modern shoes are concerned, their origin can be traced back to the crusades. Crusades were the military expeditions by the European Christian countries to recover the Holy land from the Muslims in the Middle Ages. These crusaders went on long-drawn wars and had been on their feet. So it became necessary to make shoes that would last long. Gradually, fine leather shoes of attractive designs began to appear in Italy, France and England.

           The designs of shoes have always been subject to changes according to the fashion. For example, in the 16th century people preferred shoes with broad toes. In the 17th century high heels came into fashion. Kings and nobles also ordered some special changes in the designs of their shoes.

           With the development of modern techniques, many varieties of shoes are now being made. Besides leather, rubber, plastic and canvas are also being used in shoes. Plastic-covered shoes which do not need any polishing have come into fashion. Rexin-top sports shoes have become the most popular throughout the world. Today there is a wide range of shoes to choose from according to one’s needs and taste.