Aerogel is a synthetic porous ultra-light material derived from a gel, in which the liquid component of the gel has been replaced with a gas, resulting in a solid with extremely low density and low thermal conductivity. Nicknames include "frozen smoke", "solid smoke", "solid air" or "blue smoke" owing to its translucent quality and the way light scatters in the material. However, it feels like Styrofoam to the touch.
Aerogels are solid, rigid, dry materials that do not resemble a gel in their physical properties. Pressing softly on an aerogel usually does not leave even a minor mark; pressing more firmly will leave a permanent depression. Despite the fact that it is susceptible to to shattering, it is very strong structurally.
Aerogels are good thermal insulators because they are adept at counteracting the three methods of heat transfer (convection, conduction, and radiation). They are good conductive insulators because they are composed almost entirely from a gas, and gases are very poor heat conductors. Silica aerogel is especially good because silica is also a poor conductor of heat (a metallic aerogel, on the other hand, would be less effective). Aerogels are poor radioactive insulators because infrared radiation passes right through silica aerogel. Aerogels by themselves are hydrophilic, but chemical treatment can make them hydrophobic. If they absorb moisture they usually suffer a structural change, such as contraction, and deteriorate, but this can be prevented by making them hydrophobic.
Aerogel was discovered in the late 1930’s by chemist Samuel Stephens Kistler. He accomplished this by the process of supercritical fluid drying. A supercritical fluid is any substance at a temperature and pressure above its critical poi...
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...st spacecraft. The particles vaporize on impact with solids and pass through gases, but can be trapped in aerogels.
• NASA used aerogel for thermal insulation of the Mars Rover and space suits.
• The US Navy is evaluating aerogel undergarments to be used as thermal protection for divers.
• Dunlop Sport uses aerogel in some of its racquets for tennis, squash and badminton.
The production and use of silica aerogels is nonthreatening to the environment. No considerably hazardous wastes are created during their construction. The disposal of silica aerogels is harmless. In the environment, they quickly crush into a fine powder that is basically identical to sand. Additionally, silica aerogels are completely non-toxic and non-flammable. If they eventually find their way into widespread use, they could eradicate a very large amount of unwanted, hazardous plastic materials.
Henry Drummond is an acclaimed criminal-defense lawyer and recognized agnostic, so how could a man such as this respect and appreciate the life of the fundamentalist Christian Matthew Harrison Brady? Throughout the play Inherit the Wind Drummond demonstrates that though his opinions are much different than Brady and many of the townspeople of Hillsboro when it comes to religion, he is able and willing to respect these people’s values and beliefs. After being told of Brady’s death, Drummond’s respect for the man only seems to intensify. Despite Drummond and Brady’s evident past concerning both their old friendship and contrasting views on religion, Drummond still has a fair amount of respect for Brady, and though this does not affect the trial, it does affect the play.
Inherit the Wind, a play written by Jerome Lawrence, and Robert E. Lee, is one of the greatest and most controversial plays of its time. It was written at a time of scientific revolution to benefit people of the day and in the future, however, people of the day had a hard time accepting new ideas. It is societies unwillingness to change, and accept new ideas that create racism, and hate groups of today. This unwillingness is one of the major themes of this play. This thesis will be further explained, and supported by such literary elements, as setting, and character throughout the essay.
When I found out I qualified to be a candidate for the NJHS, I knew I had to take this chance. This group is made up of people who depict leadership, character, citizenship, academic success, and service and I would love to join. These characteristics wouldn't just be valuable for a candidate to have, but for everyone to have to exceed in life. If I were to be in the National Junior Honor Society, it would give me an opportunity to ameliorate my future and motivate me to do better.
Khaled Hosseini 's novel, The Kite Runner uses lots of literary techniques. The authors use of craft reveals how Amir’s childish psychological state results in his betrayal of hassan and his irrational behavior afterwards. The main elements used are setting, conflict, and point of view.
A man meets a woman at a train station platform when he was commuting. As one of his papers blew into the woman’s face, it left her lipstick mark on it. The woman departs to the train which he missed as he was entranced by the mark on the paper and the woman. The man goes to work and believing that he will not ever see her again. However, he looks out of the window of his workplace, he sees that the woman was in the building across the street.
[9] AIAA "Position Paper prepared by the AIAA Technical Committee on Space Systems" [Online document], July 1981 [Cited 2000 November 17], Availab HTTP:http://www.aiaa.org/policy/papers/space-debris.html
Slime is a special play material made up of tangled polymer. It is mostly made by mixing polyvinyl with the chemical compound known as borate ions, you can describe it as a liquid and mix it in a sizable container for mixing. In a more difficult explanation, slime is more commonly known amongst scientists as a Non-Newtonian fluid. These are thick liquids that have a numerous selection of viscosity.
"Space Debris and Human Spacecraft." NASA. NASA, 27 Sept. 2013. Web. 25 Mar. 2014. .
On August 17th, 1917, General Jan Christian Smuts, of the Royal Flying Corps, explained the importance of airplanes that they would not just play a role as an auxiliary force within the military, but would create a new form of warfare in the skies:
On the 14th of September in the year 1607 the Earl of Tyrone Hugh O’Neill and the Earl of Tyrconnel Rory O’Donnell fled Ireland alongside officials, their families and numerous Gaelic chieftains. They left Ireland from Rathmullen in County Donegal. This flee was to become known as the flight of the Earls. They arrived in the Spanish Netherlands and then eventually made their way to Rome. The Flight of the Earls led to the most drastic form of the British government’s policy of plantation in Ireland. The Flight of the Earls has remained as one of the most memorable events in the history of Ireland. But what exactly were the reasons for the Flight of the Earls? The causes have been debated by historians with different interpretations as to why they fled but it is clear that the influence of the Earls in Ireland have been diminished greatly in the years prior to the Flight of the Earls. This essay seeks to clarify the reasons for the decline in power of the Earls in Ireland through exploration of the solidification of British rule in Ireland, along with key events in the years prior to the Flight of the Earls such as Hugh O’Neill’s campaign and onto the nine years war and the Battle of Kinsale and the Treaty of Mellifont after the Battle of Kinsale.
Vacuum sealed plastic bottle as there is no air that can enter the container. It is also very resistant to damage because if it drops it will not break. They are also recyclable to a certain extent.
By the third millennium, mankind is actively studying and exploring space. The number of space flights is increasing and they are constantly running into a number of problems. One of these is a question of the increasing contamination of space with objects from our explorations. These objects are better known as space debris or simply said – space junk. Space debris is man-made objects in Earth’s orbit or objects that reenter the atmosphere, including parts that have finished their active existence and are no longer useful.
Cruising on a seven-forty-seven, a frequent occurrence in current American society, but a pretty young industry in the broad scope of the United States’ history. It was only a little over one hundred years ago that the first airplane glided for twelve seconds. The impact of air travel can clearly be examined by looking at how humanity operated and communicated without it, how flight was innovated, and how the aviation industry changed different aspects of american life on a national scale.
Crystalloids are typically based on a solution of germ-free water with added electrolytes to approximate the mineral content of human plasma. Crystalloids come in a variety of originations, from those that are hypotonic to plasma to those that have equal or unequal tensions. It was designed to approximate the mineral and electrolyte concentration of human plasma. Colloids are often based on crystalloid solutions, thus containing water and electrolytes, but have the added component of a colloidal substance that does not freely diffuse across a semipermeable membrane. They are widely used for clinical improvements such as lung injury and other bacterial peritonitis.
These miscellaneous pieces, ranging from the size of a marble to a softball, travel at speeds up to 17,500 mph. The rising population of space debris increases the foreseen danger to all space vehicles, but especially to the International Space Station, space shuttles and other spacecraft with humans aboard (NASA, 2012).