| YPOP_Tour_of_the_Sun Educational information about the Sun. |
| Animals_of_Africa_-_Hyenas Excerpted from the illustrated book Animals of Africa. |
| Digimorph_-_Crocuta_crocuta_(Spotted_Hyena) Digital Morphology account of the spotted hyena, Crocuta crocuta, featuring CT-generated animations of the skull and commentary by Dr. Pamela Owen. |
| Female_Hyenas_and_Male_Hormones,_A_Strange_Combination Article on the "masculinized" female spotted hyena, and how this strange anatomy both helps and hinders her ability to raise cubs. |
| Hyaenidae Anatomy, behavior and taxonomy of hyenas, from the Animal Diversity Web on the University of Michigan's Museum of Zoology site. Has links to pages for each individual species of hyaenid. |
| Hyena General information about this family and facts on the Spotted Hyena. |
| Hyena_Pages Facts and photos of spotted and brown hyenas, and aardwolves. Also features information about evolution and folklore. |
| The_Hyena_Webring A webring devoted to consolidating web information about hyenas. |
| Hyenas A hyena photo gallery and some limited information. |
| Laughing_Hyena_Den_-_The_Spotted_Hyena_Centre Guide to behavior, biology, and relations with other species, plus pictures and conservation information. |
| Spotted_Hyaena_Research_in_Hwange_National_Park,_Zimbabwe Website for project dedicated to studying and protecting spotted hyenas. Extensive information is given on the hyena's classification, biology, social structure, habitat, distribution and behaviour. |
| Striped_Hyena_(Hyaena_hyaena) Physical appearance, distribution, behavior, diet, and breeding of this species. Includes a photo. |
| StripedHyena_com Information, art, and other things concerning Pallas' cats and striped hyenas. |
| Ultimate_Field_Guide__Spotted_Hyena_-_Crocuta_crocuta Information about appearance, tracks, dung, and behavior. |
| Walker\'s_Mammals_of_the_World_Online__Hyaenidae Description, taxonomy and a little evolutionary history of the hyena family. Links lead to individual pages for the three living genera of hyenas. |
| Advanced_Series_of_Structural_Engineering_Training Provides up-to-date postgraduate training in the theory and practice of structural engineering. |
| The_American_Concrete_Institute_(ACI) ACI International is dedicated to improving the design, construction, manufacture and maintenance of concrete structures. |
| American_Institute_of_Steel_Construction_(AISC) Information, news and publications (including some free to download) for structural steel design. |
| American_Society_of_Civil_Engineers_-_Structural_Engineering_Institute Organized to advance the science of structural design through a wide range of professional activities. Includes information about constituent committees. |
| ASRANet Network for integration of advanced structural analysis with structural reliability analysis. Public pages, links, products, research, focus groups. |
| Canadian_Precast/Prestressed_Concrete_Institute CPCI Members have 35 plants located throughout Canada for producing the precast concrete you require for your project. |
| Civil/Structural_Engineering_Forums_and_Portal Discussion forums, news, resources, and downloads for civil and structural engineers. |
| Concrete_Reinforcing_Steel_Institute_-_CRSI Foster the continued growth of reinforced concrete construction . Includes downloadable publications, technical resources, and information on the educational foundation. |
| David_Schnerch Research, projects, and publications on the rehabilitation/strengthening of steel and concrete structures with advanced composite (FRP) materials. Includes publications and downloadable images. |
| Design_Failure_Lessons_-_Hyatt_Regency_Hotel_Catwalk_Collapse Why it happened and how it could have been avoided. |
| Dr__Qing_Quan_Liang Research and publications in structural optimization, automatic generation of strut-and-tie models and steel-concrete composite structures. |
| Electronic_Journal_of_Structural_Engineering Publishes original articles and technical papers. |
| Engineering_Fundamentals Military manuals related to drafting fundamentals and techniques, drafting projections and sketches, wood and light-frame construction. |
| EPC_Server On-line analysis and design applications for both structures and systems. Includes beam design, frame analysis and a range of material designs. |
| European_Group_for_Structural_Engineering_Applications_of_Artificial_Intelligence Information on events, members and links. |
| Findanengineer_com Locator service for structural engineers allowing search based on specialization and location. |
| Forms_and_structures_generated_by_identicals_elements Research dealing with generation of double curvature forms with a unique modulus: an equilateral triangle. |
| iCivilEngineer_-_Structural_Engineering Catalogs Internet resources of structural engineering and only contains the links of technology information intensive sites. |
| Institute_for_Research_in_Construction The National Research Council's Institute for Research in Construction (IRC) is Canada's construction technology centre. IRC provides research, building code development, and materials evaluation ser |
| International_Association_for_Bridge_and_Structural_Engineering_-_IABSE Non-profit scientific society established in 1929 to promote the international exchange of knowledge in the field of structural engineering. Includes membership directory, publications, and conference |
| ISIS_Canada New designs for civil engineering structures using fibre reinforced polymers and fibre optic structural sensors. |
| Nova_Online__Why_the_Towers_Fell Investigates the causes of the collapse. Includes interviews with a survivor and an engineer, information on the design of the building. |
| Portland_Cement_Association Aims to improve cement and concrete and its uses, and raise the quality of construction. Page includes industry news magazine. |
| Radar_Resolution_In_Masonry__Facts_and_Myths Thesis discusses the use of radar NDT in the testing the internal masonry structures enabling initial identification of structural problems. |
| SAC_Steel_Project Seeks to develop reliable, practical, and cost-effective guidelines and standards of practice for the identification and inspection of at-risk steel moment frame buildings, the repair or upgrading of |
Sol 
Hardcopy The New Solar System Summarizes what we've learned from interplanetary explorations in the last 25 years. My primary reference for The Nine Planets. The Compact NASA Atlas of the Solar System This 'road map' of the solar system is the definitive guide for planetary science. Our Sun is a normal main-sequence G2 star, one of more than 100 billion stars in our galaxy. diameter: 1,390,000 km. mass: 1.989e30 kg temperature: 5800 K (surface) 15,600,000 K (core)The Sun is by far the largest object in the solar system. It contains more than 99.8% of the total mass of the Solar System (Jupiter contains most of the rest).It is often said that the Sun is an "ordinary" star. That's true in the sense that there are many others similar to it. But there are many more smaller stars than larger ones; the Sun is in the top 10% by mass. The median size of stars in our galaxy is probably less than half the mass of the Sun.The Sun is personified in many mythologies:the Greeks called itHelios and the Romanscalled it Sol.The Sun is, at present, about 70%hydrogenand 28% heliumby mass everything else ("metals") amounts to less than 2%. This changes slowly over time as the Sun converts hydrogen to helium in its core.The outer layers of the Sun exhibit differential rotation: at the equator the surface rotates once every 25.4 days; near the poles it's as much as 36 days. This odd behavior is due to the fact that the Sun is not a solid body like the Earth. Similar effects are seen in the gas planets. The differential rotation extends considerably down intothe interior of the Sun but the core of the Sun rotates as a solid body.Conditions at the Sun's core (approximately the inner 25% of its radius) are extreme. The temperature is 15.6 million Kelvin and the pressure is 250 billion atmospheres. At the center of the core the Sun's density is more than 150 times that of water.The Sun's energy output (3.86e33 ergs/second or 386 billion billion megawatts) is produced by nuclear fusion reactions. Each second about 700,000,000 tons of hydrogen are converted to about 695,000,000 tons of helium and 5,000,000 tons (=3.86e33 ergs) of energy in the form of gamma rays. As it travels out toward the surface, the energy is continuously absorbed and re-emitted at lower and lower temperatures so that by the time it reaches the surface, it is primarily visible light. For the last 20% of the way to the surface the energy is carried more by convection than by radiation. 
The surface of the Sun, called the photosphere, is at a temperature of about 5800 K. Sunspots are "cool" regions, only 3800 K (they look dark only by comparison with the surrounding regions). Sunspots can be very large, as much as 50,000 km in diameter. Sunspots are caused by complicated and not very well understood interactions with the Sun's magnetic field.A small region known as the chromosphere lies above the photosphere.
The highly rarefied region above the chromosphere, called the corona, extends millions of kilometers into space but is visible only during a total solar eclipse (left).Temperatures in the corona are over 1,000,000 K.It just happens that the Moon and the Sun appear the same size in the sky as viewed from the Earth.And since the Moon orbits the Earth in approximately the same plane as the Earth's orbit around the Sun sometimes the Moon comes directly between the Earth and the Sun. This is called a solareclipse; if the alignment is slighly imperfect then the Moon covers only part of the Sun's disk andthe event is called a partial eclipse. When it lines up perfectly the entire solar disk is blockedand it is called a total eclipse of the Sun. Partial eclipses are visible over a wide area of theEarth but the region from which a total eclipse is visible, called the path of totality, is verynarrow, just a few kilometers (though it is usually thousands of kilometers long). Eclipses of the Sun happen once or twice a year. If you stay home, you're likely to see a partial eclipseseveral times per decade. But since the path of totality is so small it is very unlikely that itwill cross you home.So people often travel half way around the world just to see a total solar eclipse. To stand in theshadow of the Moon is an awesome experience. For a few precious minutes it gets dark in the middle of the day. The stars come out. The animals and birds think it's time to sleep.And you can see the solar corona. It is well worth a major journey.The Sun's magnetic field is very strong (by terrestrial standards) and very complicated. Its magnetosphere (also known as the heliosphere) extends well beyond Pluto.
In addition to heat and light, the Sun also emits a low density stream of charged particles (mostly electrons and protons) known as the solar wind which propagates throughout the solar system at about 450 km/sec. The solar wind and the much higher energy particles ejected by solar flares can have dramatic effects on the Earth ranging from power line surges to radio interference to the beautiful aurora borealis.Recent data from the spacecraft Ulysses show that during the minimum of the solar cycle the solar wind emanating from the polar regions flows at nearly double the rate, 750 kilometers per second, than it does at lower latitudes. The composition of the solar wind also appears to differ in the polar regions.During the solar maximum, however, the solar wind moves at an intermediate speed.Further study of the solar wind will be done by the recently launched Wind, ACE and SOHO spacecraft from the dynamically stable vantage point directly between the Earth and the Sun about 1.6 million km from Earth.The solar wind has large effects on the tails of comets and even has measurable effects on the trajectories of spacecraft.
Spectacular loops and prominences are often visible on the Sun's limb (left).The Sun's output is not entirely constant. Nor is the amount of sunspot activity. There was a period of very low sunspot activity in the latter half of the 17th century called the Maunder Minimum. It coincides with an abnormally cold period in northern Europe sometimes known as the Little Ice Age. Since the formation of the solar system the Sun's output has increased by about 40%.The Sun is about 4.5 billion years old. Since its birth it has used up about half of the hydrogen in its core. It will continue to radiate "peacefully" for another 5 billion years or so (although its luminosity will approximately double in that time). But eventually it will run out of hydrogen fuel. It will then be forced into radical changes which, though commonplace by stellar standards, will result in the total destruction of the Earth (and probably the creation of a planetary nebula).
Webwww.nineplanets.org more Sun images from NSSDC Stanford Solar Center Yohkoh Public Outreach Project, lots of good info, images and movies The University of Michigan Solar and Heliospheric Research Group's Web Space for Kids and Non-Scientists Today's Space Weather and index of solar images Solar Data Analysis Center Elemental abundances in the Sun Solar Eclipse info from Fred Espenak, Mr. Eclipse from Solar Data Analysis Center Sky Online's Eclipse Page Dale Ireland's Eclipses images by Bob Yen Umbraphilia, a personal account of the 1998 eclipse in the Caribbean National Solar Observatory / Sacramento Peak Image Index more info and links about sunspots historical info about sunspots Virtual Tour of the Sun by Michael Berger The Sun: a Pictorial Introduction, a slide set by P. Charbonneau and O.R. White The HK Project Ulysses Home Page Spartan 201, NASA's mission to explore the Sun's corona IACG Campaign IV: including lots of good references Lives and Deaths of Stars; notes by Nick Strobel of the University of Washington ESA/NASA's SOHO - Solar and Heliospheric Observatory home page articles by John Bahcall, many focusing on the solar neutrino problem Interview with Sol by Robert J. Nemiroff Solar Folklore, various myths about the Sun