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"Light Wave-length."
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What are light waves?
\"This engaging title introduces readers to the science of light waves. Relatable examples, accessible text, and a creative design challenge help readers discover the properties of light waves and their essential role in seeing our world\"-- Provided by publisher.
Book
Multiwavelength cosmology : proceedings of the \Multiwavelength Cosmology\ conference, held on Mykonos Island, Greece, 17-20 June, 2003
The recent scientific efforts in Astrophysics & Cosmology have brought a revolution to our understanding of the Cosmos. Amazing results is the outcome of amazing experiments! The huge scientific, technological & financial effort that has gone into building the 10-m class telescopes as well as many space and balloon observatories, essential to observe the multitude of cosmic phenomena in their manifestations at different wavelengths, from gamma-rays to the millimetre and the radio, has given and is still giving its fruits of knowledge. These recent scientific achievements in Observational and Theoretical Cosmology were presented in the \"Multiwavelength Cosmology\" conference that took place on beautiful Mykonos island in the Aegean between 17 and 20 June 2003. More than 180 Cosmologists from all over the world gathered for a four-day intense meeting in which recent results from large ground based surveys (AAT/2-df, SLOAN) and space missions (WMAP, Chandra, XMM, ISO, HST) were presented and debated, providing a huge impetus to our knowledge of the Cosmos. The future of the subject (experiments, and directions of research) was also discussed. The conference was devoted mostly on the constraints on Cosmological models and galaxy formation theories that arise from the study of the high redshift Universe, from clusters of galaxies, and their evolution, from the cosmic microwave background, the large-scale structure and star-formation history.
eBook
Stimulation growth, yield, and accumilation of antioxidant compounds of onion hybrids by colored shades of poly ethylene covers
This research was conducted at vegetable field of the Department of Horticulture and
Landscape Gardening –College of Agricultural Engineering Sciences - University of Baghdad.
The experiment was conducted using Randomized Complete Block Design within split plot
arrangement with three replicates. The hybrids (white, yellow, red) represented the main
plots, symbolized (HW, HY, HR) and the colored covers of the tunnels (without cover,
transparent, red, yellow, blue) represented the sub plots, which symbolized (C0, CW, CR, CY,
CB).The statistical analysis revealed significant differences of HR in producing the highest
values of the studied traits, such as, leaves number (14.73), leaf area (24.79 dcm2
), plant yield
(190 gm.), chlorophyll concentration (9.733 mg.100-1
gm f. w.). Also the results revealed the
significant superiority of yellow cover, in leaves number (18.11), leaf area (29.63 dcm2
), plant
yield (222 gm.), chlorophyll concentration (10.44 mg.100-1
gm f. w.), anthocyanin
concentration (24.67 mg.100-1
gm f. w.). The results that obtained from interaction between
hybrids and covers were showed the significant predomination of HRCY in producing the
highest numbers in the mentioned characters (18.33 leaves, 34.18 dcm2
, 233.3 gm. 11.33
mg.100-1
gm f. w.) respectively
Journal Article
Can Humans See Ultraviolet Light?
\"The colors of the rainbow are all around us, but so are hues that most of us can't see, including ultraviolet--a wavelength that eludes many humans but, surprisingly, many animals can perceive. Ultraviolet (UV) wavelengths are smaller than those on the visible spectrum, but can people see them? The answer, it turns out, depends on how old you are and whether your eyes contain UV-filtering lenses.\" (Live Science) Learn whether humans can see ultraviolet light.
Newspaper Article
The natural fireworks that glow across skies
\"This February [2026], dark skies festivals are taking place at national parks across the UK. The events are a chance for people to observe and discuss the night sky, including stars, planets and a dazzling display of dancing lights called an aurora. An aurora is a natural light display caused by particles from the Sun interacting with Earth’s atmosphere. It appears as colourful lights that can be seen on clear and dark nights. Auroras happen in both the northern and southern hemispheres.\" (The Week Junior) Learn more about auroras.
Magazine Article
Do different people see the same colours?
\"What colours you see depends not just on how things are in the world around you, but also on what happens in your eyes and brain. The eyes are specialised body organs for sensing light. The light coming into your eyes is made up of many colours, formed from light waves of different lengths...You might think that since the colour of an object is decided by the wavelength of light that bounces off it, everyone would see the same colours. However, there's more going on inside the human body, and this affects how people see colour.\" (The Week Junior Science and Nature) Learn why people see the same colors differently.
Magazine Article
New simulative studies on performance of semiconductor optical amplifier based optical switches like frequency converter and add-drop multiplexer for optical data processors
Optics has proved its successful role in parallel logic, arithmetic or algebraic operations. So many different methods on optical data processing were proposed and implemented in last few decades. For implementing the all optical logic and arithmetic devices it needs different types of encoding principle like, polarization encoding principle, frequency encoding principle, intensity encoding principle and phase encoding principle. As the frequency is the basic characteristics of light, so frequency encoding principle is the most reliable one among all other encoding principles. Currently frequency encoding technique is established as a promising one for all optical processing, as frequency of light does not change normally after reflection, refraction, absorption etc. Again Semiconductor optical amplifier (SOA) can be used for different successful frequency conversions. Here in this technique ‘1’ logic state is represented by a frequency ν
2
then ‘0’ state is represented by another frequency ν
1
instead of intensity variation. In this paper the authors describe the simulation study of the performances of SOA in various optical switches like frequency conversion and add-drop multiplexer.
Journal Article
All optical frequency encoded NAND logic operation along with the simulated result
Optical frequency encoding/decoding techniques are important in optical signal processing and communication because of its inherent advantages. There are several research works are already reported where this frequency encoding/decoding mechanism are successfully used to develop logic gates in optical domain. The frequency encoded logic gates can show very low bit error rate and with a very small optical power the logic operation can be conducted too. Here in this paper the authors report an all optical NAND logic gate using frequency encoding/decoding techniques successfully. At the same time the concept of frequency encoded controlled NAND logic is proposed here. The simulated results of the NAND logic are also reported in this paper. To implement the NAND operation non-linear activity of semiconductor optical amplifier (SOA) is exploited here for switching purpose. As a whole the whole logic gates perform its operation at a very high speed (greater than THz frequency). The simulated result of the operation also supports the theoretical prediction of the operation.
Journal Article
Multiwavelength Cosmology
The recent scientific efforts in Astrophysics & Cosmology have brought a revolution to our understanding of the Cosmos. Amazing results is the outcome of amazing experiments! The huge scientific, technological & financial effort that has gone into building the 10-m class telescopes as well as many space and balloon observatories, essential to observe the multitude of cosmic phenomena in their manifestations at different wavelengths, from gamma-rays to the millimetre and the radio, has given and is still giving its fruits of knowledge. These recent scientific achievements in Observational and Theoretical Cosmology were presented in the 'Multiwavelength Cosmology' conference that took place on beautiful Mykonos island in the Aegean between 17 and 20 June 2003. More than 180 Cosmologists from all over the world gathered for a four-day intense meeting in which recent results from large ground based surveys (AAT/2-df, SLOAN) and space missions (WMAP, Chandra, XMM, ISO, HST) were presented and debated, providing a huge impetus to our knowledge of the Cosmos. The future of the subject (experiments, and directions of research) was also discussed. The conference was devoted mostly on the co.
eBook
STUDY OF CHARACTERISTICS OF SPECTRAL INTERFERENCE SIGNALS IN THE NEAR INFRARED SPECTRAL RANGE
Peculiarities of signals formation in spectral interferometry and optical coherence tomography are considered. Basic relations are given defining minimal depth coordinate value of an investigated object, where single period of spectral interference signal is acquired and a value of the wave length increment set according to the depth range, where spectral interference signals are registered. The estimate of resolving power of the spectral interfereometry and optical coherence tomography systems with tunable wave length is given taking into account a spectral range of wave length tuning. It is shown that the ratio of the wave length mean value and the range of the wave length tuning defines the resolving power in depth of an investigated object, while the maximum depth range, within which investigation of an object’s micro structure by the spectral optical coherence tomography is possible does not depend on the range of the wave length tuning being determined by the wave length (wave number) tuning step. Numerical estimates of the parameters mentioned above are presented when using light sources in near infrared range, as well as relations and estimates of interference fringe visibility dependent on registered relative intensity of a measuring wave.
Journal Article