lead bullets are poisoning eagles
Bookmarked 412 weeks ago
ecomass compounds replace lead and other metallic materials they provide the design and production advantages of injection molded plastics can be formulated up to leads density and deliver metals physical properties more details just visit our website : http:wwwecomasscom

baskets and stone hatchet
Bookmarked 531 weeks ago
i made 2 types of basket and a celt hatchet the first type of basket made was a coil basket bunches of palm leaves where wrapped in thin strips of lawyer cane to for a coil this was then coiled into a spiral with each coil being tied to the last to keep it in place this was done by sewing a new section of coil to the previous one the basket was given a flat base so it could stand up but could be made any shapethe second basket was made of lawyer cane it started with thick strips of cane placed on the ground crossing in the centers to form an asterix shape importantly another half a lawyer strip was added so that the number of spokes the basket had was odd- even numbers don039t work with this type of basket the canes were tied together in the center with a strip of bark and a piece of cane was woven in a spiral around the spokes like a spider web when the base was wide enough the spokes were bent up to form the vertical sides of the basket the weaving continued up the walls to the top and the ends of the spokes folded down back into the basketthe coil method was very time consuming about a week on and off and made a heavy basket but used simple materials and had few gaps in it long grass could be used instead of palm leaves and any type of ties could be used to bind the coils this type of basket can look very neat if done carefully the one i made was rough also i would add that circular or rectangular mats might be made using this method and these materials this might provide thick padding against the ground for sitting and sleeping and when finished could be rolled up and stored out of the waythe woven cane baskets were much faster to make 2 or 3 hours each including harvesting materials they used fewer materials and were lighter too i could have easily made them bigger but wanted them to fit through the narrow door of the tiled hut the baskets will be used mainly for storing charcoal inside huts out of the rain but are also useful for carrying leaf mulch for the garden they have flat bases meaning they can stand upright and even be stacked on top of each other i also made a small celt hatchet for lighter work the big celt i made is useful for chopping bigger trees but is overkill for saplings and smaller trees the method used was basically the same for the big celt though this time i used no fire hardening the handle came from a branch cleared from the the sweetpotato patch and had sat for a few months seasoning on the ground it was much harder to shape than green wood but was hard enough to not need fire hardening so far i039ve used it without the handle splitting though the basalt head chipped when trying to chop dry eucalyptus branches an especially hard wood- i re sharpened it and it works on other woods ok

silly putty drop: 2009
Bookmarked 712 weeks ago
what happens when you drop a 50-pound ball of silly putty from the top of dh hill library the experiment was part of the departments annual materials summer camp for high school studentshigh school students drop silly putty from dh hill http:wwwalumnincsuedublog20090619high-school-students-drop-silly-putty-from-dh-hillmaterials science ampamp engineering http:wwwmsencsuedu for a transcript of this video please visit: http:ncsueduwebcommyoutubetranscriptsputty-071509doc

why are plane windows round
Bookmarked 527 weeks ago
we often learn the most from our failures this is particularly true for advancements in the field of engineering unfortunately for the engineers in the aviation industry the prices to pay for failure are high this will be a reoccurring theme in my videos trust me the flip-side of this unforgiving industry is that it consistently provides learning opportunities for engineers because failure is not an option when peoples lives are at riskone of the greatest examples of this occurred during the development of cabin pressurisation the problems caused by cabin pressurisation didnt develop until the introduction of the first commercial jet powered aircraft the de havilland comet it entered service in 1952 and initially proved to be a massive success but just one year into service catastrophe struck three comets suffered fatal mid-flight disintegrations and the entire fleet was grounded until the cause was identifiedthe root of the problem was double-edged the introduction of jet engines required planes to fly even higher in order to make the fuel hungry engines economically viable less drag in the upper atmosphere means less fuel is needed as a plane increases in altitude the external atmospheric pressure lowers to a greater extent than the internal cabin pressure this creates a pressure differential that causes the fuselage to expand ever so slightly engineers accounted for this but the effects of repeated pressure cycles over time were not well known at the time over thousands of cycles and metal begins to fatigue and cracks can form at high stress locationsthe effects of stress concentration were also not well understood at the time stress concentration occurs when the flow of stress is interrupted square windows in contrast to modern oval windows provide a significant barrier to the smooth flow of stress because of this stress peaks at the sharp corner of the window and this is exactly where investigators determined the origin of failure to bethese combined phenomenon proved to be fatal today all airliners feature oval windows to avoid this stress concentration and comprehensive fatigue testing is required before a plane can be approved by the faa we often learn the most from our failures this is particularly true for advancements in the field of engineering these are now two basic concepts that every materials engineer is taught these events allowed us to further our understanding of materials and prevent further failuresfor licensing rights contact me at mcmanusbrian15gmailcomask before stealing my content looking at you dailymail

using lasers to create super-hydrophobic materials
Bookmarked 580 weeks ago
scientists at the university of rochester have used lasers to transform metals into extremely water repellent or super-hydrophobic materials without the need for temporary coatings super-hydrophobic materials are desirable for a number of applications such as rust prevention anti-icing or even in sanitation uses however as rochesters chunlei guo explains most current hydrophobic materials rely on chemical coatings in a paper http:scitationaiporgcontentaipjournaljap117310106314905616 published today in journal of applied physics guo and his colleague at the universitys institute of optics anatoliy vorobyev describe a powerful and precise laser-patterning technique that creates an intricate pattern of micro- and nanoscale structures to give the metals their new properties this work builds on earlier research by the team in which they used a similar laser-patterning technique that turned metals black http:wwwrochesteredunewsshowphpid=2701 guo states that using this technique they can create multifunctional surfaces that are not only super-hydrophobic but also highly-absorbent opticallyguo adds that one of the big advantages of his teams process is that the structures created by our laser on the metals are intrinsically part of the material surface that means they wont rub off and it is these patterns that make the metals repel waterthe material is so strongly water-repellent the water actually gets bounced off then it lands on the surface again gets bounced off again and then it will just roll off from the surface said guo professor of optics at the university of rochester that whole process takes less than a second the materials guo has created are much more slippery than teflona common hydrophobic material that often coats nonstick frying pans unlike guos laser-treated metals the teflon kitchen tools are not super-hydrophobic the difference is that to make water to roll-off a teflon coated material you need to tilt the surface to nearly a 70-degree angle before the water begins to slide off you can make water roll off guos metals by tilting them less than five degreesas the water bounces off the super-hydrophobic surfaces it also collects dust particles and takes them along for the ride to test this self-cleaning property guo and his team took ordinary dust from a vacuum cleaner and dumped it onto the treated surface roughly half of the dust particles were removed with just three drops of water it took only a dozen drops to leave the surface spotless better yet it remains completely dry guo is excited by potential applications of super-hydrophobic materials in developing countries it is this potential that has piqued the interest of the bill and melinda gates foundation which has supported the work in these regions collecting rain water is vital and using super-hydrophobic materials could increase the efficiency without the need to use large funnels with high-pitched angles to prevent water from sticking to the surface says guo a second application could be creating latrines that are cleaner and healthier to uselatrines are a challenge to keep clean in places with little water by incorporating super-hydrophobic materials a latrine could remain clean without the need for water flushing but challenges still remain to be addressed before these applications can become a reality guo states it currently takes an hour to pattern a 1 inch by 1 inch metal sample and scaling up this process would be necessary before it can be deployed in developing countries the researchers are also looking into ways of applying the technique to other non-metal materials guo and vorobyev use extremely powerful but ultra-short laser pulses to change the surface of the metals a femtosecond laser pulse lasts on the order of a quadrillionth of a second but reaches a peak power equivalent to that of the entire power grid of north america during its short burstguo is keen to stress that this same technique can give rise to multifunctional metals metals are naturally excellent reflectors of light thats why they appear to have a shiny luster turning them black can therefore make them very efficient at absorbing light the combination of light-absorbing properties with making metals water repellent could lead to more efficient solar absorbers solar absorbers that dont rust and do not need much cleaningguos team had previously blasted materials with the lasers and turned them hydrophilic meaning they attract water in fact the materials were so hydrophilic that putting them in contact with a drop of water made water run uphill http:wwwrochesteredunewsshowphpid=3387help us caption ampamp translate this videohttp:amaraorgvga08

micro-robots team up to act like vacuum cleaner
Bookmarked 760 weeks ago
micro-robots or quotastersquot designed by argonne national laboratory physicists alexey snezhko and igor aronson pick up free-floating particles this video is courtesy of nature materials

worlds first elastic electricdatausb cables - roboden diginfo
Bookmarked 744 weeks ago
diginfo tv - http:diginfotv10112011asahi kasei fibersroboden

foreign language courses - be fluent in a foreign language in 90 days
Bookmarked 475 weeks ago
foreign language courses http:learntospeakalanguagescom meet anna she loves travelling but she is unhappy she wants to travel but shes having problem communicating with people1 who do not speak english2 her friends are all bi-lingual3 she often feels left out of conversationanna has trouble getting around and generally just feels alone she often feels stupid because shes the only one that cannot hold a good conversation with others because she speaks only one language she was angry with herself for never bothering to learn another foreign language she decided to do something about it by learning how to speak spanish but she has a problemshe has some troublesshe cannot afford the tuition fees she also works full time so hasnt got much free time to learn anna was determined so found a solution she stumbled across a foreign language courses website which allowed her free access to start learning spanish directly online it also allowed her to study the co

why are metals so stretchy 213 sub special - youtube
Bookmarked 174 weeks ago
it039s play button time and today it039s made from copper foil - a surprisingly stretchable material you wouldn039t think that crystalline materials like metals

how de-constructing buildings diverts a massive amount of waste - sustainable demolition alternative - youtube
Bookmarked 219 weeks ago
deconstruction is an incredible green alternative to traditional building demolition instead of tearing down a building and dumping all of the waste in the

texarkana train derailment amp explosion
Bookmarked 723 weeks ago
seven train cars and a tankcar containing flammable gas derailed on october 15 2005 at a railroad switchyard in texarkana arkansas the derailment caused a liquefied gas leak and explosion that killed one person and forced the evacuation of hundreds of homes this video stresses the need to quickly research and properly identify chemicals involved in a hazardous materials incident it also re-enforces the need to be prepared to immediately evacuate the scene of a hazardous materials incident

navy039s railgun fired 1000 times powered up
Bookmarked 748 weeks ago
the us naval research laboratory materials testing facility announced that it has fired its electromagnetic railgun 1000 times and reached a materials testing milestone toward the deployment on warships

print a 3d model of your unborn baby with the 039shape of an angel039 service diginfo
Bookmarked 707 weeks ago
print a 3d model of your unborn baby with the 039shape of an angel039 servicehttp:wwwdiginfotvv12-0158-r-enphpdiginfo tv - http:diginfotv382012 fasotectenshi no katachi

tera raid exploit - new fastest way to farm - youtube
Bookmarked 170 weeks ago
tera raids have a huge exploit that allows you to get items and resources way faster

ftr corporate video directed by hadi khali wwwtvipacom
Bookmarked 733 weeks ago
this 7 minutes corporate video was produced in hd high definition for ftr international inc one of the largest construction amp engineering company in californiaftr is driven to build challenging and complex projects with the firms expertise in design-build sustainable building technically advanced construction methodology and all-inclusive construction management services ftr international inc is committed to building the future today