The Vega Science Trust - Parabolic Light Collectors Video recorded in 2008. Parabolic surfaces can be used to concentrate energy for example to focus sunlight to heat things. Using an old World War II spot light mirror we demonstrate how easy it it is to concentrate enough energy to cause combustion. Finally, we show how to make a simple experimental version to safely explore solar heating. See the following link for details of making your own parabolic device. General Safety Warning: This experiment should always be undertaken with the supervision of a teacher. Links To Other Information: ParabolaLink to Article of Parabola Creative Science CentreVisit the virtual science centre packed full of things to make and do!
It’s in the NEWS! Newspaper. It’s one of the things I’ve never thrown away. And with my obsessive coupon clipping last year..we have TONS! While newspaper comes in handy when cleaning windows/mirrors, stuffing and wrapping packages. Paint strips of newspaper to make colorful newspaper roses. Make biodegradable seedling starters! These Newspaper nails are a must try in my book! WHY didn’t I think of this!!! Need an envelope… don’t worry! Run a piece thru the printer and put it in a frame for a great way to display silhouettes. If you’re feeling extra spunky… take a look at this Newspaper dress. I made these Newspaper Gift Bags: Aren’t they so neat! There are tons of tutorials out there. These would be great for all you Etsy sellers that are doing craft shows this summer! Do you have a favorite way to re-use your newspaper?? # kristanlynn xoxo
DIY Outdoor Pallet Wood Sofa | Pallet Furniture Plans After sometime we become more expert about home furniture items with working with pallet wood. You can design you own DIY pallet wood sofa by keeping in mind of different chair structure and size of your mattress after getting some pallet wood to achieve your desired article pallet stool bench, pallet tool box and pallet planter box and many other items of home used furniture. Pallet wood can be attained in your garage and stocks of your home. This will also solve storage problems of our home stocks and garage with which most of us suffer greatly, by taking out old pallet wood furniture commodities. You can start your DIY pallet wood sofa by making the base first to support back and seat board of pallet on it. Measurements of pallet wood sofa base, on which back and seat boards have to be placed. Arrangement of back and seat board for pallet sofa should be even and balanced for comfortable sitting. Image source
Doomsday rule The Doomsday rule or Doomsday algorithm is a way of calculating the day of the week of a given date. It provides a perpetual calendar since the Gregorian calendar moves in cycles of 400 years. This algorithm for mental calculation was devised by John Conway after drawing inspiration from Lewis Carroll's work on a perpetual calendar algorithm. It takes advantage of the fact that each year has a certain day of the week (the doomsday) upon which certain easy-to-remember dates fall; for example, 4/4, 6/6, 8/8, 10/10, 12/12, and the last day of February all occur on the same day of the week in any given year. Applying the Doomsday algorithm involves three steps: This technique applies to both the Gregorian calendar A.D. and the Julian calendar, although their doomsdays will usually be different days of the week. The algorithm is simple enough for anyone with basic arithmetic ability to do the calculations mentally. Doomsdays for some contemporary years Examples Note:
History of linguistics Linguistics as a study endeavors to describe and explain the human faculty of language. In ancient civilization, linguistic study was originally motivated by the correct description of classical liturgical language, notably that of Sanskrit grammar by Pāṇini (fl. 4th century BCE)Tolkappiyam in Tamil, or by the development of logic and rhetoric among Greeks. Beginning around the 4th century BCE, China also developed its own grammatical traditions and Arabic grammar and Hebrew grammar developed during the Middle Ages. Modern linguistics began to develop in the 18th century, reaching the "golden age of philology" in the 19th century. Antiquity Across cultures, the early history of linguistics is associated with a need to disambiguate discourse, especially for ritual texts or in arguments. India Pāṇini (c. 4th century BCE) opposes the Yāska view that sentences are primary, and proposes a grammar for composing semantics from morphemic roots. Greece
The Creative Science Centre - by Dr Jonathan P. Hare (Note: this article has been published: J. P. Hare, Phys. Educ. 42 (2007) 267-270 and is here reproduced by permission of IOP) Click here for a parabola mini film Note: for details of talks and workshops on this topic click here:talks and workshops Parabolic mirror surfaces are found wherever energy needs to be focused efficiently and accurately. Photo 1. The Parabola When Sun light (parallel rays) falls onto a correctly aligned parabolic mirror it will be reflected back towards a single point known as the focus. The basic shape of a parabola is derived from the equation: y² = 4ax  Where y represents the distance away from the mirror centre and x represents the 'height above' the centre, see figure 1 and 2. Figure 1. If we want to make a parabolic reflector to our own particular specification i.e. in terms of its size D (i.e. having maximum y = D/2), height h and focal length a, then equation 1 becomes: a = D²/16h  Figure 2. and so on for larger values of y What to heat? Notes 1. 2.
Booze it Up! 13 Rad Recycled Bottle Crafts & Projects Got a recycling bin full of glass bottles? Why waste them when you could have a new table lamp, candle holder, shelving unit, hummingbird feeder, glass countertop, building block – even a whole glass-bottle house? Reuse beer, wine and liquor bottles for these 13 fun and creative crafts and upcycling projects ranging up to a recycled bottle home and garden. Wine Bottle Table Lamp (images via: wit and whistle) Turning any wine bottle into a table lamp is as simple as drilling a hole and inserting a strand of lights. Wine Bottle Candle Holder (image via: design sponge) How simple and elegant are these DIY wine bottle candle holders? Wine Bottle Shelves (images via: renest) Would you ever have thought of using wine bottles and slabs of wood to create a shelving unit? Bottle Trees (images via: recyclart, metaefficient, examiner) Turn your holiday tree into an ode to beer (or perhaps just a sparkling green alternative to a living tree) using reclaimed empty bottles. Beer Bottle Drinking Glasses
Make a DIY Pallet Coffee Table | Pallet Furniture Plans This easy to make rustic indoor coffee table is made from pallet wood. The pallet was dismantled and the thicker rails were used as the frame but they were slightly twisted. To straighten it was soaked with water and weighed down on a flat surface to dry. The slats were screwed across the top of the frame then cut straight. This coffee table looks great by itself once cleaned and sanded, or it would look great with wood stain. You will enjoy its look and use for a long time to come. Submitted by Michael Tapscott!
J! Archive Semiotics Semiotics frequently is seen as having important anthropological dimensions; for example, Umberto Eco proposes that every cultural phenomenon may be studied as communication. Some semioticians focus on the logical dimensions of the science, however. They examine areas belonging also to the life sciences – such as how organisms make predictions about, and adapt to, their semiotic niche in the world (see semiosis). In general, semiotic theories take signs or sign systems as their object of study: the communication of information in living organisms is covered in biosemiotics (including zoosemiotics). Syntactics is the branch of semiotics that deals with the formal properties of signs and symbols. More precisely, syntactics deals with the "rules that govern how words are combined to form phrases and sentences". Terminology Ferdinand de Saussure, however, founded his semiotics, which he called semiology, in the social sciences: History Formulations Branches Notes
Achmed Khammas - Das Buch der Synergie - Teil C - Parabolspiegel Anlagen (Dish-Stirling-Systeme) Eine weitere Form der solarthermischen Kraftwerke beinhaltet den Einsatz von Parabol-Spiegeln, die das Sonnenlicht auf einen einzigen Brennpunkt fokussieren und dort Temperaturen von 800°C oder sogar mehr erreichen. Dabei wird die Wärme nicht nur zum Betrieb eines Wasser-Dampf-Kreislaufs genutzt, sondern oftmals auch zum direkten Antrieb eines Stirlingmotors (s.d.). Diese zweiachsig nachgeführten Systeme sind besonders für den dezentralen Einsatz geeignet (stand-alone-systems) und liegen typischerweise im Leistungsbereich zwischen 5 kW und 50 kW. Für größere Leistungen lassen sich die Systeme zu einer Farm zusammenschalten. Einen Vorläufer – der noch dazu aufblasbar und für den Einsatz im All gedacht ist – fand ich ein einer frühen Ausgabe des US-Magazins Popular Mechanics vom Juli 1961. Auf dem Flug in den Orbit hat der Parabolspiegel das Volumen eines Wasserglases, wo er aufgeblasen zu einem metallisierten Mylar-Reflektor mit einem Durchmesser von 2,15 m wird. Folienkuppel-Dish
EcoFriendly Menstrual Pads Wet Bags and More by sbb1 Tangeez - Tangible Lights by Emily Webster & Mustafa Bagdatli "Tangeez are wonderful building blocks of light. The magnetic click and the translucent colors are incredibly satisfying. They're continually offering new combinations, and they're impossible to put down. I want a whole wall of them." These “physical pixels” create a tactile, interactive and social experience that allows you to hold and control light. The more you change and rearrange, the more colors you will see. "They've got the simple charm of a set of Dominoes and yet they're like an interactive set of Legos. -Donald Chestnut, Chief Experience Officer, SapientNitro From spaceships to skyscrapers, Christmas trees to robots, Tangeez can be combined and stacked infinitely to build glowing structures of any shape and size. Fun for both young and old alike, Tangeez can be used as ambient lights, educational toys, interactive building blocks, therapeutic tools, camping lights, emergency beacons and much more! Tangeez brighten up any space and are as portable and mobile as you are.