Xem 1-20 trên 68 kết quả The physical basis
  • The physical basis of color exists in the interaction of light with matter, both outside and inside the eye. The sensation of color depends on physiological activity in the visual system that begins with the absorption of light in photoreceptors located in the retina of the eye and ends with patterns of biochemical activity in the brain. Perceived color can be described by the color names white, gray, black, yellow, orange, brown, red, green, blue, purple, and pink. These 11 basic color terms have unambiguous referents in all fully developed languages.

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  • If the text you're using for general chemistry seems to lack sufficient mathematics and physics in its presentation of classical mechanics, molecular structure, and statistics, this complementary science series title may be just what you're looking for. Written for the advanced lower-division undergraduate chemistry course, The Physical Basis of Chemistry, Second Edition, offers students an opportunity to understand and enrich the understanding of physical chemistry with some quantum mechanics, the Boltzmann distribution, and spectroscopy.

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  • Innovation in engineering often means the clever use of a new material - new to a particular application, but not necessarily (although sometimes) new in the sense of ‘recently developed’. Plastic paper clips and ceramic turbine-blades both represent attempts to do better with polymers and ceramics what had previously been done well with metals. And engineering disasters are frequently caused by the misuse of materials.

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  • They were an extraordinary group of talents: Wigner won a Nobel Prize in theoretical physics; Szilard was the first to see that a chain reaction based on neutrons was possible, initiated the Manhattan Project, but left physics to try to restrict nuclear arms; von Neumann could solve difficult problems in his head and developed the modern computer for more complex problems; von Kármán became the first director of NASA's Jet Propulsion Laboratory, providing the scientific basis for the U.S.

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  • Magnetism often has a slight overtone of being mysterious. This is probably caused by the surprisingly strong forces between magnets which everybody can experience with magnetic toys, magnet boards, or similar objects. A strange effect is the unique ability of magnetic fields to penetrate many substances without any attenuation. Though the physical basis of magnetism is well explored, the outsider usually does not know very much about the details and sometimes tends to overestimate the real possibilities provided by magnetism.

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  • Although allostery plays a central role in driving protein–DNA interac-tions, the physical basis of such cooperative behavior remains poorly understood. In the present study, using isothermal titration calorimetry in conjunction with site-directed mutagenesis, we provide evidence that an intricate network of energetically-coupled residues within the basic regions of the Jun-Fos heterodimeric transcription factor accounts for its allosteric binding to DNA.

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  • The Editor of the Theosophical Forum in April, 1901, noted the death of Mr. Thomas E. Willson in the previous month in an article which we reproduce for the reason that we believe many readers who have been following the chapters of "Ancient and Modern Physics" during the last year will like to know something of the author. In these paragraphs is said all that need be said of one of our most devoted and understanding Theosophists. In March, 1901, The Theosophical Forum lost one of its most willing and unfailing contributors. Mr. T.E.

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  • An interesting aspect of Fluid Mechanics is the often surprising connection betwee seemingly disparate problems. The similarity between radionuclide migration an wood charring may not be immediately obvious, but the radial basis functio approach described in the next chapter underscores the connection between the two In these problems, the interface between the fluid and the solid boundary changes i time according to events within the fluid.

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  • The ‘electronic book’ is a feature of this early 21st Century. I have been in academic life for several decades, and have I hope responded with flexibility to changes over that time. I have been using a word processor on a daily basis for twenty years and am deeply conscious of the advantages over even the most advanced typewriters. The first time I gave a presentation using Microsoft PowerPoint was in India about six years ago. I have with enthusiasm used PowerPoint for every invited talk or conference contribution I have given since....

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  • This introduction to nuclear physics provides an excellent basis for a core undergraduate course in this area. The authors show how simple models can provide an understanding of the properties of nuclei, both in their ground and excited states, and of the nature of nuclear reactions. They include chapters on nuclear fission, its application in nuclear power reactors, the role of nuclear physics in energy production and nucleosynthesis in stars.

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  • Understanding and quantitative describing of marine ecosystems requires an integration of physics, chemistry and biology. The coupling between physics, which regulates for example nutrient availability and the physical position of many organisms is particularly important and thus cannot be described by biology alone. Therefore the appropriate basis for theoretical investigations of marine systems are coupled models, which integrate physical, chemical and biological interactions.

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  • Nine years has passed since the 1992 second edition of the encyclopedia was published. This completely revised third edition, which is a university and professional level compendium of chemistry, molecular biology, mathematics, and engineering, is refreshed with numerous articles about current research in these fields. For example, the new edition has an increased emphasis on information processing and biotechnology, reflecting the rapid growth of these areas.

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  • Basic principles and objectives of supercharging Since the radial compressor will be discussed in detail in Chap. 5 in connection with exhaust gas turbocharging and as part of the exhaust gas turbocharger, at this point its function will only be addressed as the basis for its map characteristics. All flow compressors are based on the physical principle of the transformation of kinetic energy, which is supplied to the medium in the impeller, into a pressure rise via flow deceleration, partially in the impeller, partially in a diffuser.

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  • Much has changed in the 3 years since the first edition of this book. The physics of heat, light, sound and energy is still the same, so there is little change in the first three parts. Apart from the correction of a few errors, a few new developments are mentioned, some new methods are included and statistics updated. Part 4 has many new elements that reflect societal changes, especially changes in public attitudes. Three years ago there were many who denied global warming or who regarded renewable energy technologies as ‘ kids ’ stuff ’. Today only a few of these survive.

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  • According to the original definition of mechatronics that the Yasakawa Electric Company proposed and the definitions that have since appeared, many engineering products designed and manufactured in the last thirty years that integrate mechanical and electrical systems can be classified as mechatronic systems . In trademark application documents, Yasakawa defined mechatronics in this way: The word mechatronics is composed of “mecha” from mechanism and the “tronics” from electronics.

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  • Cerium, an element in the lanthanide series, has a number of radioactive isotopes. Several of these are produced in abundance in nuclear fission reactions associated with nuclear industry operations or detonation of nuclear devices. This report summarizes our present knowledge of the relevant physical, chemical, and biological properties of radiocerium as a basis for establishing radiation protection guidelines.

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  • This fourth revised edition of “Technical Basis of Radiation Therapy: Practical Clinical Applications”, edited by S. H. Levitt, J. A. Purdy, C. A. Perez, and S. Vijaykumar, continues this publication’s outstanding excellence in the definition of the technical advances for radiation therapy. The previous three editions were milestones in the definition of new technologies and how they would be applied in clinical practice.

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  • CONFORMAL AND INTENSITY-MODULATED RADIOTHERAPY—WHY AND HOW? Scientific rationale Whilst drug development plays an important but expensive role in the treatment of some cancers, it is estimated that, at a time when 2% of patients are cured by drugs, some 30% are cured by a combination of surgery and radiotherapy. Radiotherapy may be the ‘sticking plaster of cancer’ but it is likely to be necessary for many decades to come and it merits continual development.

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  • With the evaluation method is scientific and has been tested as: methods speculation, rapid assessment methods, research methods analyze the physical environment (water, air), statistical methods,comparison methods, ... to make reliable assessments as a basis for consultation measures to reduce environmental pollution both during construction and operation of the project.

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  • An option of longstanding interest is prevention—interventions that prevent or delay the occurrence of the very diseases that drive these costs. There are three kinds of prevention. Primary prevention can be accomplished by modifying unhealthy behaviors (e.g., smoking, physical inactivity), which cause many diseases and account for 38% of all deaths in the United States, 6 administering immunizations to prevent infectious diseases, and reducing exposure to harmful environmental factors.

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