L'aérogel, isolant miracle, bientôt disponible à prix cassés Une structure à base d’aérogel utilisée par la mission Stardust (Tim Johnson/Reuters). L’aérogel est le matériau solide le plus léger du monde. Avec une densité de quelque 3 grammes par litre, il est dix fois plus léger que le polystyrène expansé, deux fois plus lourd que l’air. Transparent, ce matériau supporte sans bobo 2 000 fois son poids et ne fond qu’à 1 200 °C. Inventé en 1931, l’aérogel reste cher. Quoi de neuf ? Qui plus est, en utilisant comme matière un déchet agricole, le son (l’enveloppe du grain) de riz. Isolation ? Photo : Un responsable du montre le collecteur raérogeléalisé en aérogel utilisée par la sonde spatiale Stardust pour collecter des poussières de comète (Tim Johnson/Reuters).
Oricalco Da Wikipedia, l'enciclopedia libera. Il termine "oricalco" deriva originariamente dal greco antico ορειχαλκος, oréichalkos, "rame dalla montagna" (da ὄρος, óros, "monte" e χαλκός, chalkós, "rame"). Con la successiva trascrizione in latino il prefisso óros venne adattato ad āurum, "oro", cosicché aurichalcum significava letteralmente "rame d'oro" o "rame dorato".[1] Origine leggendaria[modifica | modifica sorgente] Uso antico[modifica | modifica sorgente] Musicologia[modifica | modifica sorgente] Applicazioni tecnologiche moderne[modifica | modifica sorgente] Con il termine oricalco è stato denominato nel 2001 il primo tessuto a memoria di forma a trama ortogonale mai realizzato basandosi su un filato in lega metallica di nichel e titanio. Riferimenti nella cultura di massa[modifica | modifica sorgente] Musica[modifica | modifica sorgente] Giuseppe Verdi cita l'oricalco nella sua opera "Otello" (1887):Franco Battiato cita l'oricalco nella sua canzone "Atlantide" (album Caffè de la Paix, 1993):
Reuben Margolin’s Kinetic Wave Sculptures Our Mechanics theme brought to mind San Francisco Bay Area kinetic sculptor Reuben Margolin, one of my all-time favorite artists. He makes mind-blowing, moving art based on tiny observations in nature. His collection of waves has the ability to quiet, soothe, and inspire awe in the viewer. Margolin combines math and simple materials (and insanely neat string and pulley systems) to recreate and amplify subtle effects that often go unnoticed in nature, like a tiny ripple or the movement of a caterpillar. One of my favorite Make: television segments is this fascinating 10-minute profile of Margolin: Goli Mohammadi I’m senior editor at MAKE and have worked on MAKE magazine since the first issue. The maker movement provides me with endless inspiration, and I love shining light on the incredible makers in our community. Contact me at goli (at) makermedia (dot) com. Related
Translucent roofing system uses aerogel to allow full spectrum, natural light into living spaces with comfort and energy efficiency December 8, 2005 Nanotechnology threatens some radical changes to the way we live – indeed, it threatens to change some of our fundamental belief systems. Anyone with a rudimentary understanding of physics will tell you that putting a clear roof on our dwellings allowing full spectrum, natural light, will result in a disastrously inefficient energy monster. But nanotechnology can offer glass and polycarbonate remarkable new properties as this story illustrates. We’ve written about the world’s lightest substance before (here and here), but now some of aerogel’s other properties are beginning to find commercial application and by filling polycarbonate or glass with nanogel, the clear substances retain their light transmission qualities while delivering outstanding thermal insulation. Consumers purchasing new homes are increasingly requesting floor plans that include more natural light, both to improve aesthetics and to reduce energy needed for interior lighting.
Lordosis Lordosis is the normal inward lordotic curvature of the lumbar and cervical regions of the human spine.[1] The normal outward (convex) curvature in the thoracic and sacral regions is termed kyphosis or kyphotic. The term comes from the Greek lordōsis, from lordos ("bent backward").[2] Lumbar hyperlordosis is excessive extension of the lumbar region, and is commonly called hollow back or saddle back (after a similar condition that affects some horses). Types[edit] Lumbar lordosis[edit] Normal lordotic curvatures, also known as secondary curvatures, result in a difference in the thickness between the front and back parts of the intervertebral disc. In radiology, a lordotic view is an X-ray taken of a patient leaning backward.[5] Lumbar hyperlordosis[edit] Lumbar hyperlordosis is a condition that occurs when the lumbar region (lower back) experiences stress or extra weight and is arched to point of muscle pain or spasms. Other health conditions and disorders can cause hyperlordosis. Mad cat
Stardust - Frequently Asked Questions To catch particles in space, the Stardust spacecraft uses a special material called aerogel. These are frequently asked questions about this material: How is aerogel made? Mixing four chemicals, which react to form a wet gel, similar to a gelatin dessert creates Aerogel. What is it used for? The Stardust Project is using aerogel as a capture media, where it will collect very small interstellar and cometary particles as they embed themselves in the porous aerogel. What does it feel like? The microstructure of aerogel is extremely porous, so it feels like volcanic glass pumice or even a very fine, dry sponge, except that it is much lighter. Why is it blue? Aerogel has a blue cast for the same reason that the sky is blue. Where can I get some aerogel? Aerogel is commercially available in limited quantities from a few companies. How much does aerogel cost? Aerogel is relatively expensive primarily because it is currently made in very limited quantities. What makes aerogel so special? Is it solid?
Howie Green Gallery: Fritz Trautmann - Personal Rhythms Personal Rhythmsby Fritz Trautmann When man feels his own personal rhythms vibrating in tune with the forces playing upon him, he calls the experience "Beauty." It may happen on the plane of the senses, on the level of the intellect, in the depths of his affections, or at the exalted heights of spiritual insight, but wherever met and however designated, it is - of its kind - a response to this sense of beauty. As sensory experience - described as savory or delicious, handsome or pretty, harmonious or melodic, soothing, exhilarating, aromatic or fragrant - it is Pleasure. To the intellect - when it is consistent, functional or logical it is Truth. To the heart - when sympathetic, compassionate or loyal it is Love. To the soul - when masterful, efficient or wise it is Goodness or God. Yet the experience of Beauty cannot be so simply analyzed. Author Notes: This is a passage that Fritz had given me in the summer of 1970 and that has laid buried in a box of stuff since then. - Howie Green
Geekologie - Gadgets, Gizmos, and Awesome Vacuum Insulated Glass--------------VIG <p> <p> E_mail: huqinhu New generation energy saving glass For use in historical buildings Most historical window frames cannot be adapted to support insulated glazing. In addition, the 15 mm or thicker insulated glazing panels conflict with the 4 mm original frames. The Government Building Agency “Rijksgebouwendienst” (RGD) of the Dutch ministry of Housing, Spatial Planning and the Environment (VROM) is responsible for government buildings. RGD often faces problems of meeting insulation standards in historical buildings. For use in renovation projects for housing, the glass can be fitted in existing frames and replace single or low class energy saving glazing. For use in cold climates The “typical” window type depends on the area. The “typical” window type for cold climates can with vacuum glazing be superfluous and attributes to lower building costs and a high energy cost reduction. The thickness of the Spacia vacuum double glazing is 8mm and performance extremely well in U-value of 1.2. Specifications: Features:
What Is an Orthopedic Surgeon? - Orthopedic Surgery An orthopedic surgeon, or orthopaedic surgeon, is a surgeon who has been educated and trained in the diagnosis and preoperative, operative, and postoperative treatment of diseases and injuries of the musculoskeletal system. Orthopedic surgeons work closely with other health care providers and often serve as consultants to other physicians. Orthopedic surgeons often are involved in education (e.g., medical school professors) or research. They may practice in an orthopedic or multi-specialty group, or in a solo practice. Orthopedic surgeons treat a number of conditions that affect the bones, joints, muscles, ligaments, tendons, and nerves. ArthritisBone tumorsCerebral palsyClub foot, knock knees, bow legs, bunions, hammertoesDislocationsFractures, sprains, and strainsMuscle, ligament, and tendon damageOsteoporosisSpine disorders (e.g., sciatica, scoliosis, ruptured disc) Publication Review By: Stanley J.
Organic and Carbon Aerogels What is an Organic Aerogel? Organic aerogels have been around as long as any aerogel-in fact, the first aerogel Samuel Kistler is believed to have prepared was aerogel made from jelly (which is composed of the organic heteropolysaccharide pectin). Kistler also prepared aerogels of gelatin and rubbers, both of which are composed of organic polymers. Basically, an organic aerogel is any aerogel with a framework primarily comprised of organic polymers. Generally, organic aerogels have very different properties from inorganic aerogels such as silica aerogel and metal oxide aerogels. They are generally less friable and less fragile than inorganic aerogels, instead squishing when compressed. Although organic aerogels have been around since the first aerogels were prepared, they were, for the most part, overlooked until the 1980′s when Lawrence Livermore National Laboratory scientists began producing organic aerogels made of phenolic resins. What is Carbon Aerogel? Other Organic Aerogels C = εA/d