A Review on Li-Fi: The Next Generation Wi-Fi

The Li-Fi stands for Light Fidelity. The technology is very new and was proposed by the German physicist Harald Haas in 2011 TED (Technology, Entertainment, Design) Global Talk on Visible Light Communication (VLC). Light Fidelity (LiFi) is a Visible Light Communication (VLC) based technology that making a light as a media of communication replacing the cable wire communication. LiFi is evolved to overcome the rate speed in Wi-Fi, while using LiFi the rate speed can reach until 14 Gbps. This paper includes an introduction of the LiFi technology including the architecture, working, performance, and the challenges Li-Fi, its applications, features and comparison with existing technologies like Wi-Fi etc. Wi-Fi is of major use for general wireless coverage within building, whereas Li-Fi is ideal for high density wireless data coverage in confined area and especially useful for applications in areas where radio interference issues are of concern, so the two technologies can be considered complimentary. Keywords: LED, Li-Fi Technology, Wi-Fi Technology, Data Transmission, Visible Light, Li-Fi Applications

History Of Great Discoveries In Physics

History of great discoveries in physics french scientist AA Beckerel, german physicist VK Rentgen, english physicist, founder of nuclear physics, polish scientists E. Rutherford, french physicists Maria and Pierre Curie, german scientist G. Schmut, Russian chemist D.I. Mendeleev, english physicist and chemist F. Simple, romanian chemist and physicist G.Heveshi, austrian radiochemist and chemist F.Panet, english physicist J.D.Cockroft, Irish physicist E.T.S. Walton, the english physicist-experimenter J. Chedwick, is directly and indirectly associated with the names of the italian scientist E. Fermi.

Holism | Cosmopsychism – And the Collapse of the Wavefunction

The holistic view of the Universe is a very promising approach. The necessity of such a view is shown by the teaching of Carl Friedrich von Weizsäcker, a German physicist and philosopher. If we accept Panpsychism as the best alternative to Materialism and Dualism, we should take the holistic view seriously. Panpsychism and Holism combined lead to the Idea of Cosmopsychism. If we consider the Universe as a holistic Quantum System, we should ask, what causes the collapse of its wavefunction? I offer four possible answers and I tend to divine consciousness, which brings the collapse of the wavefunction of our Universe.

An Architectural Design Proposal to Implement Li-Fi Framework

Harald Haas, a German physicist, invented the concept of Li-Fi abbreviated to Li-Fi. Li-Fi is the communication between two LED light sources by transmitting information through light in a speed faster than a human eye can detect. This paper explores the usage of LED light to act about as a Li-Fi source to transmit data. The information is caught utilizing the receiver device which is attached to an Android cell phone. This paper proposes a methodology on working up a Li-Fi based framework to facilitate the navigation inside a shopping mall using visible light.

The Sense and Reference of Sound; or, Walter Pater’s Kinky Literalism

David Sweeney Coombs, “The Sense and Reference of Sound; or, Walter Pater’s Kinky Literalism” (pp. 487–514) This essay explores the erotic possibilities of literal reading by strategically fetishizing the recurring figure of harmony in Walter Pater’s essay “The School of Giorgione” (1877) and his other post-Renaissance writings. I read Pater’s invocations of harmony literally with help from the scientific acoustics of the German physicist Hermann von Helmholtz, which achieved immense popularity in Britain at just the moment that Pater made his famous declaration that all art aspires to the conditions of music. Both Pater and Helmholtz understood perception as an act of reading bodily sensations in which reference—our attention to the objects we infer to be present in the world around us—constantly threatens to overwhelm our awareness of the sensations themselves. In his work on acoustics, however, Helmholtz singled out musical harmony as an experience uniquely susceptible to the mental effort to distinguish discrete sensations during the act of perception. Oscillating between sense and reference, harmony exemplifies the rhetorical logic of what Pater calls literal metaphors—figures whose figurative significance can be fully accessed only by taking them literally. The most emblematic of Pater’s literal metaphors is the Paterian figure itself, at once human form and trope. To take Paterian figures literally, this essay suggests, is to reimagine literal reading as a form of kink—a fetishizing of the sensory forces through which a figure affects and dominates us.

The Principles of General Relativity

This chapter considers what the theory actually achieved and specifically reexamines the meaning of the relativity principle. The question of its meaning was raised by critical observers whose comments led to a partial reinterpretation of general relativity. The German physicist Erich J. Kretschmann argued that the principle of general covariance has no physical content and only constitutes a mathematical requirement. This contention generated an exchange of letters in which Einstein conceded Kretschmann's criticism, but Einstein does not mention Kretschmann's remarks explicitly in his book. The chapter discusses these developments and correlates them with his correspondence with colleagues and with other texts he published during the formative years.

120 years since the discovery of X-rays

This paper is intended to celebrate the 120th anniversary of the discovery of X-rays. X-rays (Roentgen-rays) were discovered on the 8th of November, 1895 by the German physicist Wilhelm Conrad Roentgen. Fifty days after the discovery of X-ray, on December 28, 1895, Wilhelm Conrad Roentgen published a paper about the discovery of X-rays - ?On a new kind of rays? (Wilhelm Conrad Roentgen: ?ber eine neue Art von Strahlen. In: Sitzungsberichte der W?rzburger Physik.-Medic.-Gesellschaft. 1895.). Therefore, the date of 28th of December, 1895 was taken as the date of X-rays discovery. This paper describes the work of Wilhelm Conrad Roentgen, Nikola Tesla, Mihajlo Pupin and Maria Sklodowska-Curie about the nature of X-rays. The fantastic four - Wilhelm Conrad Roentgen, Nikola Tesla, Mihajlo Idvorski Pupin and Maria Sklodowska-Curie set the foundation of radiology with their discovery and study of X-rays. Five years after the discovery of X-rays, in 1900, Dr Avram Vinaver had the first X-ray machine installed in Sabac, in Serbia at the time when many developed countries did not have an X-ray machine and thus set the foundation of radiology in Serbia.

Erich Regener and the ionisation maximum of the atmosphere

In the 1930s the German physicist Erich Regener (1881–1955) did important work on the measurement of the rate of production of ionisation deep under water and in the atmosphere. Along with one of his students, Georg Pfotzer, he discovered the altitude at which the production of ionisation in the atmosphere reaches a maximum, often, but misleadingly, called the Pfotzer maximum. Regener was one of the first to estimate the energy density of cosmic rays, an estimate that was used by Baade and Zwicky to bolster their postulate that supernovae might be their source. Yet Regener's name is less recognised by present-day cosmic ray physicists than it should be, largely because in 1937 he was forced to take early retirement by the National Socialists as his wife had Jewish ancestors. In this paper we briefly review his work on cosmic rays and recommend an alternative naming of the ionisation maximum. The influence that Regener had on the field through his son, his son-in-law, his grandsons and his students, and through his links with Rutherford's group in Cambridge, is discussed in an appendix. Regener was nominated for the Nobel Prize in Physics by Schrödinger in 1938. He died in 1955 at the age of 73.

Training Tennis Players through Natural Philosophy: From Scaino’s Trattato to Garsault’s Art du paumier

The motion of tennis balls has always been taken as a particularly interesting example of the complexity of the laws of motion. In this essay I survey the historical and cultural background of the use of the tennis ball as a scientific example of motion and its laws from the late Italian Renaissance onwards. I have examined in particular Antonio Scaino’s Trattato del giuco della palla (1555) and its scientific sources. Scaino’s effort to provide his readers with a scientific explanation of various tennis shots inspired the authors of other texts on sports to adopt an approach that combined science and leisure activities. However, the mysterious irregular trajectory of the tennis ball remained unexplained until 1852 when the German physicist Heinrich Gustav Magnus demonstrated mathematically how the action of air was the cause of the variation in motion of projectiles.