Nowadays more and more youngsters become addicted to obtaining tanned skin in order to look better despite even lethal consequences. The weekly newsmagazine Maclean’s via its article Kids Want to Tan provides readers with the information about the risks related to indoor and outdoor sunbathing resulting in skin damages. According to the different sources‚ a number of young people in the age of 12 to 17 (79%) realize the drawbacks of tanning; moreover‚ nearly 81 percent of them find it possible to
Premium Cancer Oncology Metastasis
environment of outer space. (c) It absorbs most of the cosmic rays from outer space and a major portion of the electromagnetic radiation from the sun. (d) It transmits only here ultraviolet‚ visible‚ near infrared radiation (300 to 2500nm) and radio waves (0.14 to 40 m) while filtering out tissue-damaging ultraviolet waves below about 300 nm. (Singh‚ 2006) Oxidizing atmosphere - Current atmosphere Reducing atmosphere - Original atmosphere. In particular‚ it probably did not contain oxygen
Premium Atmosphere Oxygen Sun
article titled “The Burden of Knowledge‚” Orwell attributes the origin and development of beliefs to the general gullibility of a given era’s people. Beliefs of my own that I will take into consideration and analyze using Orwell’s notion include ultraviolet radiation and the
Premium Mind Philosophy Epistemology
Gas Tungsten Arc Welding The Process Gas Tungsten Arc Welding‚ also known as Tungsten Inert Gas Welding‚ is an arc welding process that uses a non-consumable tungsten electrode to produce a weld. The weld area is protected from atmospheric contamination by an inert shielding gas‚ such as argon or helium‚ and filler metal is normally used‚ except in autogenous welds. A constant-current welding power supply produces energy which is conducted across the arc through a column of highly ionized gas and
Free Welding Arc welding
Abstract Basal Cell Carcinoma (BCC) is the most common type of malignant cancer found in the world today with a 3-10% increase in incidence each year. White males have a 33-39% risk of having BCC during his lifetime‚ whereas women have a risk of 23-28%. The American Cancer Society (2014) reported that 8 out of 10 patients with skin cancer are suffering from BCC with more than 2 million new cases each year. Therefore a method needs to be developed that can detect BCC at the early stages to prevent
Premium Cancer Oncology Metastasis
The ozone layer diminishes more each year. As the area of polar ozone depletion (commonly called the ozone hole) gets larger‚ additional ultraviolet rays are allowed to pass through. These rays cause cancer‚ cataracts‚ and lowered immunity to diseases.1 What causes the depletion of the ozone layer? In 1970‚ Crutzen first showed that nitrogen oxides produced by decaying nitrous oxide from soil-borne microbes react catalytically with ozone hastening its depletion. His findings started
Premium Ozone depletion Ozone layer Chlorine
available naturally‚ and are also made available through science and technology in different ways‚ intended for the purposes we desire. This light that enables us to see‚ the x-rays (which gives us pictures of bones and soft tissue)‚ the gamma and ultraviolet rays (which are used for sterilization)‚ infrared‚ the microwave (microwave ovens and cell phones)‚ radio waves‚ extremely low frequency waves etc. are all packed in the radiation that emanates from the sun. From time immemorial human race knew
Premium Ionizing radiation Gamma ray Radioactive decay
"[10] The name was derived from the mineral fluorite (calcium difluoride)‚ some examples of which contain traces of divalent europium‚ which serves as the fluorescent activator to emit blue light. In a key experiment he used a prism to isolate ultraviolet radiation from sunlight and observed blue light emitted by an ethanol solution of quinine exposed by it.[11] Physical principles [edit] Photochemistry [edit] Fluorescence occurs when an orbital electron of a molecule‚ atom or nanostructure relaxes
Premium Fluorescent lamp
Layers of the Atmosphere The envelope of gas surrounding the Earth changes from the ground up. Five distinct layers have been identified using... • thermal characteristics (temperature changes)‚ • chemical composition‚ • movement‚ and • density. Each of the layers are bounded by "pauses" where the greatest changes in thermal characteristics‚ chemical composition‚ movement‚ and density occur. Troposphere The troposphere begins at the Earth’s surface and extends from 4 to 12 miles (6 to 20
Free Atmosphere Earth
wave propagation. EMR is characterized by the frequency or wavelength of its wave. The electromagnetic spectrum‚ in order of increasing frequency and decreasing wavelength‚ consists of radio waves‚ microwaves‚ infrared radiation‚ visible light‚ ultraviolet radiation‚ X-rays and gamma rays. The eyes of various organisms sense a somewhat variable but relatively small range of frequencies of EMR called the visible spectrum or light. Higher frequencies correspond to proportionately more energy carried
Free Electromagnetic radiation