This document discusses drones (also called UAVs or unmanned aerial vehicles). It defines drones as aircraft that are controlled remotely or autonomously without a human pilot on board. The document outlines the history of drones, from early attempts at unmanned aircraft to their widespread use today. It describes common drone features and provides examples of specific drone models. The document also discusses various commercial and military applications of drones, such as surveillance, agriculture, delivery, and warfare. Finally, it notes that expansion of the drone market is currently limited by a lack of adequate regulations in most countries.
Seminar On 5G Network
Contents:
Introduction to 5G.
Salient features of 5G.
Evolution from 1G to 5G.
Hardware and Software of 5G.
Advantages.
Challenges.
Applications.
5G Key Enabling Technologies.
Conclusion.
References
La radio surgió gracias a los descubrimientos e inventos de científicos como Maxwell, Bell, Hertz y Popov en el siglo XIX. Marconi unió estas tecnologías para crear el primer sistema de radio a fines de ese siglo. En la década de 1920, inventores como De Forest y Sarnoff mejoraron la radio permitiendo transmisiones más claras y su uso en el hogar. La primera estación comercial, KDKA, se estableció en 1920 y para 1925 había 600 estaciones de radio en el mundo, dando inicio a la era de la radiofonía comercial
Radio developed from earlier inventions like the telegraph and telephone using electromagnetic waves to transmit audio such as music and speech without wires. Key developments included Maxwell and Hertz's work establishing the existence of radio waves in the 1860s-1880s, Marconi's successful transatlantic radio transmission in 1901, and Armstrong's invention of FM radio in 1933 which improved audio quality. Radio broadcasting began in the early 1920s and grew rapidly that decade as more people purchased receivers. However, the lack of regulation led to interference issues until the Federal Radio Commission was established in 1926 to bring order. Radio has since been used for various purposes like education, news, entertainment and more, becoming an important mass medium.
The document summarizes the history and development of radio technology from the late 19th century through the 1920s. Key points include:
- James Clerk Maxwell and Heinrich Hertz discovered radio waves in the 1860s-1880s, laying the groundwork for wireless communication. Inventors like Marconi, Popov, Tesla, and De Forest then developed early wireless telegraphy.
- The formation of RCA in 1919 consolidated the U.S. radio industry and ensured American dominance globally. David Sarnoff's leadership helped establish NBC as the first radio network in 1926.
- The Radio Act of 1927 established the Federal Radio Commission to regulate stations and allocate frequencies, bringing order to the growing chaos of radio
This document discusses drones (also called UAVs or unmanned aerial vehicles). It defines drones as aircraft that are controlled remotely or autonomously without a human pilot on board. The document outlines the history of drones, from early attempts at unmanned aircraft to their widespread use today. It describes common drone features and provides examples of specific drone models. The document also discusses various commercial and military applications of drones, such as surveillance, agriculture, delivery, and warfare. Finally, it notes that expansion of the drone market is currently limited by a lack of adequate regulations in most countries.
Seminar On 5G Network
Contents:
Introduction to 5G.
Salient features of 5G.
Evolution from 1G to 5G.
Hardware and Software of 5G.
Advantages.
Challenges.
Applications.
5G Key Enabling Technologies.
Conclusion.
References
La radio surgió gracias a los descubrimientos e inventos de científicos como Maxwell, Bell, Hertz y Popov en el siglo XIX. Marconi unió estas tecnologías para crear el primer sistema de radio a fines de ese siglo. En la década de 1920, inventores como De Forest y Sarnoff mejoraron la radio permitiendo transmisiones más claras y su uso en el hogar. La primera estación comercial, KDKA, se estableció en 1920 y para 1925 había 600 estaciones de radio en el mundo, dando inicio a la era de la radiofonía comercial
Radio developed from earlier inventions like the telegraph and telephone using electromagnetic waves to transmit audio such as music and speech without wires. Key developments included Maxwell and Hertz's work establishing the existence of radio waves in the 1860s-1880s, Marconi's successful transatlantic radio transmission in 1901, and Armstrong's invention of FM radio in 1933 which improved audio quality. Radio broadcasting began in the early 1920s and grew rapidly that decade as more people purchased receivers. However, the lack of regulation led to interference issues until the Federal Radio Commission was established in 1926 to bring order. Radio has since been used for various purposes like education, news, entertainment and more, becoming an important mass medium.
The document summarizes the history and development of radio technology from the late 19th century through the 1920s. Key points include:
- James Clerk Maxwell and Heinrich Hertz discovered radio waves in the 1860s-1880s, laying the groundwork for wireless communication. Inventors like Marconi, Popov, Tesla, and De Forest then developed early wireless telegraphy.
- The formation of RCA in 1919 consolidated the U.S. radio industry and ensured American dominance globally. David Sarnoff's leadership helped establish NBC as the first radio network in 1926.
- The Radio Act of 1927 established the Federal Radio Commission to regulate stations and allocate frequencies, bringing order to the growing chaos of radio
2. - A telefon olyan
távbeszélő eszköz,
amely beszédet
továbbít elektromos
jelek formájában.
- Lehetővé teszi, hogy
emberek olyankor is
tudjanak egymással
beszélni, mikor
hallótávolságon kívül
tartózkodnak.
3. Történet
Legtöbben úgy tudják, hogy Alexander Graham Bell
találta fel, majd építette meg 1876-ban, de rajta kívül
még sokan mások szerepet játszottak a feltalálásában.
4. Az alapokat Morse találmánya, a távíró fektette le, ez
volt ugyanis az első elektromos jeleket továbbító
hálózat.
5. 1854-ben egy francia távíróműszerész, Charles Borseul
felvetette annak lehetőségét, hogy hangot is lehetne
valahogy a hálózaton továbbítani. Szintén ebben az
időszakban kísérletezett még Johann Philipp Reis és
Elisha Gray is.
6. Bell egy olasz bevándorló, Antonio Meucci
nyomdokain indult el. Amit Meucci 1874-ben anyagi
nehézségek miatt nem tudott jogi védelem alá
helyezni, azt két évvel később Bell szabadalmaztatatta.
(2002-ben az Egyesült Államok
képviselőháza nyilatkozatot
fogadott el, melyben az olasz
feltalálót ismeri el a telefon feltalálójaként.)
7. Végül Bell és az ő csapata építette meg a telefont, ami
végül 1876 után Bostonból kiindulva meghódította a
világot.
8. Nem sokkal később, 1878-ban feltalálták a szénporos
mikrofont, mely jelentősen javított a hangfelvétel
minőségén.
9. 1888-ban Almon Strowger feltalálta és megépítette az
első automata telefonközpontot.
10. Fajtái
A készülékek csoportosítása többféleképpen
történhet.
- Vezetékes telefonok:
- Nyilvános
- Nosztalgia
- Cselédhívó
- Kezelői
- ISDN telefon
- IP telefon
