Sanskrit is the name given to ancient classical language of the Hindu inhabitants of India. It was introduced into India probably about 1500 B.C. and was for a time the spoken language as well as the literary language. The sacred Hindu books – the Vedas – were written in Old Sanskrit, but the name really apply only to the form …

Safety glass is that has been strengthened. there are two kinds of this protective glass laminated and toughened and both were discovered by accident. In the early 1900s Edouard Benedictus, a French chemist, knocked a glass flask on to the floor. Although the glass starred and cracked, it did not break. After examining the flask he realized that a coating …

Riemann Hypothesis is an important result in Mathematics whose truth or otherwise is not yet known. It asserts that an important function (called Riemann Zeta function) takes the value zero only along a certain line in the right half of the complex plane. This was conjectured by the German mathematician Gerhard Riemann in 1859 and, in spite of efforts by …

Rhinology is the study of the nose, including the sinuses, and concerns itself with medical and surgical diseases of the nasal passages and paranasal sinuses. It is becoming more important after the introduction of nasal endoscopes. A rhinologist is a specialist otolaryngologist (an ENT specialist). Rhinology was practised as early as 4000 BC – there is an inscription on the …

It is a blood group. People whose blood contains this group are referred to as being Rhesus positive. Those who lack it are called Rhesus negative.

Raman Scattering or Raman Effect is the inelastic scattering of a photon. This was first reported by CV Raman for which he was awarded the Nobel prize in 1930. When light is scattered from an atom or a molecule, most photons scatter elastically. However, a small fraction (1 in a million) is scattered inelastically. The frequency of these photons changes, …

लंदन की रीजेंट स्ट्रीट पर स्थित हैमलेज दुनिया की अपने तरह की सबसे बड़ी और सबसे पुरानी खिलौनों की दुकान है। यहाँ अरब देशों के रईस शेख अपने बच्चों के लिए सबसे लेटेस्ट खिलौने खरीदने आतें हैं तो रूसी कुलीन वर्ग के लोग भी अपने बच्चों के लिए ट्रक भर कर यहीं से खिलौने ले जाते हैं। असल में यह …

Radar, or radio location, as it was called in the early days, is the use of radio waves to find the whereabouts of aircraft or ships. Electromagnetic waves, which include radio and light waves, all travel at the same speed. When small bursts of radio waves, fired into space from a transmitter, strike an object such as an aircraft some …

A ‘quasi-resonant’ DC to DC converter with zero-current and zero-voltage switching includes a transformer with primary and secondary windings, and periodic switching means connected in series with the primary winding. The topology of the converter is determined by selecting an input capacitor with a capacitance much lower than the output capacitor.

द्वितीय विश्व युद्ध में अंग्रेजों एवं मित्र देशों की सामरिक शक्ति अधिक होने पर भी आजाद हिन्द फौज के सेनानी उन्हें कड़ी टक्कर दे रहे थे. लेफ्टिनेंट ज्ञानसिंह बिष्ट भी ऐसे ही एक सेनानायक थे, जिन्होंने अपने से छह गुना बड़ी अंग्रेज टुकड़ी को भागने पर मजबूर कर दिया. 16 मार्च, 1945 को ‘सादे पहाड़ी के युद्ध’ में भारतीय सेना …