Most people use both terms between “bulletproof” and “bullet resistant”, the correct term is bullet resistant glass because we have yet to make a glass thick enough to get shot and still maintain visibility
There are two types of bullet resistant glass- “solid acrylic and laminated polycarbonate. Solid acrylic is just as its name suggests – a solid sheet of acrylic either 1-1/4” or 1-3/8” thick depending on the level of protection required. Laminated polycarbonate is made by layering polycarbonate, a heavy-duty clear plastic, between two sheets of glass and laminating it all together. It can be ¾”, 1” or 1-1/4” thick depending on the level of protection”. While a bullet will pierce the exterior glass layer of laminated polycarbonate, the inner
I have written this science research paper to compare ballistics of a .270 and a .30-06. This paper will also make my decision on which one I will purchase next. If I fire the .270 and the .30-06 rifles into a 2x4, then I will be able to determine from the ballistics which caliber rifle is better. For my experiment, I fired two rounds of ammunition into a 2x4 with each gun. Both rifles were fired at a range of 50 yards away, into the wind, while using 150 grain shells. The rounds for the .270 used soft tips, but the .30-06 used sharp tips.
Ballistics is the scientific study of the dynamics of projectile and bullet trajectory. Crime members utilize equipment that will allow to match individual characteristics to a known object in order to make a comparison. Just like the Locards exchange principle “when two objects come in contact, evidence is always left behind”. When a weapon has been shot, the barrel of the gun will leave marks on the bullet. With the marks left behind, one can scientifically prove the kind of weapon used, trajectory and estimate the distance between criminal and victim.
Carbon is one of the 115 chemical elements discovered on Earth which is part of the nonmetals group with other elements such as nitrogen, oxygen, and hydrogen. Carbon as an element has good stability, it is very light, very stable, and has many types of forms such as graphite, and coal. Carbon fiber is just another form of carbon, basically has filaments between five to ten micrometers in diameter of pure carbon or at least 90% of carbon. Thousand carbon fibers are twisted together to form a long chain, which can then be used in a variety of raw forms, including yarns, weaves, and braids, which are in turn mixed with synthetic resins to create the carbon fiber as a composite material. Based on different characteristics carbon fibers can be divided into three principals groups: according to carbon fiber tensile modulus, according to precursor fiber materials, and according to final heat
People with guns need safes that can secure and protect their firearms. There are a variety of gun safes available in the market and each gun safe caters to a specific need, and what works for one gun owner may not work for the other.
due to the nature of crushed glass). The other workers put up a folding green screen to
In the last ten years there have been eighteen school shootings in the United States. Elementary Schools, Middle Schools, High Schools, and Universities are all included. From these eighteen shootings there were one hundred and one students and faculty members killed, the majority being students. In the average classroom, there is at least fifteen students to one teacher. One adult is tasked with insuring the safety of fifteen to thirty students. How are teachers expected to accomplish this in the event of a shooting? There are safety codes and drills practiced such as code red, code blue, and evacuation drills that can help keep students safe. In the event of a code red students are to gather in the corner of the room farthest from the door; teachers turn off the lights and lock the door. Some teachers do what they can and barricade the classroom door with desks or filing cabinets… but hiding in a dark room isn 't enough. A code red is called out when an intruder is in the building. The shooter would hear the code red being announced and know the students are hiding, especially if the shooter is a member of the school, then they know exactly what the procedure is. A barricaded door might deter a shooter, but they will most likely move on to the next class-- or they decide that the barricade isn’t going to stop them. In the high school I attend the vast majority of classroom doors are mostly glass; in theory a school shooter can shoot right through without even having to enter the classroom. The best way to protect students is to have a more effective defense against threats.
STRUCTURE Kevlar Aramid Fiber is a synthetic (man-made) material known as Polymer. A polymer is a chain that is made up of many similar molecular groups, better known as ‘monomers’ that are bonded together. The ‘Monomers’ are made up of fourteen Carbon atoms, two Nitrogen atoms, two Oxygen atoms and ten Hydrogen atoms. A single Kevlar polymer chain could possibly have anywhere from one to five million monomers bonded together. A group of polymer chains can be organised together in a fiber.
Dental composites, also known as "white fillings", are a group of restorative materials composed of a mixture of powdered glass and plastic resin regularly used in modern dentistry to resemble the appearance of the natural tooth. Acrylic resin was first introduced to the dental profession in the mid 1950s. Since their introduction, acrylic based materials have continued to play a pivotal role in restorative and prosthetic dentistry. After the introduction of the bisphenol A glycidyl methacrylate, or BIS-GMA, by Bowen in the early 1960s the potential application of resins has emerged. This composition and formulation possessed a higher molecular weight and therefore better mechanical properties and reduced polymerization shrinkage, the newer polymer offered potential for much greater applications that included anterior and posterior composite resin restorations, indirect inlays/onlays, pit and fissure sealants and more wear resistant denture teeth.
The bulletproof clothing basically looks like a very strong net. Bulletproof clothing is made up of seven layers of bullet-resistant webbing. The three types of the layers are the carrier, Kevlar and plastic film. The body armor just looks like a very strong net. Kevlar is strong, but they also make bulletproof with another material called vectran.
Most of the necessities humans need are provided in supermarkets, in fact supermarkets have become a necessity for our everyday life. They are now the main source of water, food, clothes and everyday tools. Therefore, the plastic bags demanded and supplied in this industry increase every day. In the past decade, we produced as much plastic as we did in the whole twentieth century (Freinkel, 2011). This exponential increase of a non-biodegradable material has negatively impacted our environment immensely. Plastic production requires our dwindling fossil fuel resources, robs away animal lives, litters our beautiful landscapes and even affects our very own well-being. Hence, if plastic production doesn’t diminish immediately, we will suffer great
Polyethylene (PE) is one of the most commonly used polymers which can be identified into two plastic identification codes: 2 for high-density polyethylene (HDPE) and 4 for low density polyethylene (LDPE). Polyethylene is sometimes called polyethene or polythene and is produced by an addition polymerisation reaction. The chemical formula for polyethylene is –(CH2-CH2)n– for both HDPE and LDPE. The formation of the polyethylene chain is created with the monomer ethylene (CH2=CH2).
When choosing a proper type of window frame, fiber glass is the number one choice. Fiberglass is the strongest material to use for the job and it also involves a smaller amount of maintenance compared to vinyl or wood.
Fiber optics are thin transparent fibers of glass or plastic enclosed by a material of a lower index of refraction and that transmit light throughout their length by internal reflections. Real fiber optic cables are made out of very pure glass, glass so pure that if it were miles thick, light would still be able to pass through. The fiber optic strand, although thin in diameter, is stretched to miles in length. Therefore only the purest of glass would be efficient and useful for sending light signals. The glass of these fiber optic cables is drawn into a very thin strand (as thin as human hair), then it is coated in two layers of plastic. By coating the glass in plastic (this is called the cladding), a "mirror" is created around the glass. This creates a total internal reflection. In other words, when light is passed through the cable, the light will reflect off the interior surface of the cable, and continue to bounce off the reflective surface until it reaches the opening at the other end. Light travels through the fiber optic cable and bounces off at shallow angles, and stays completely within the glass fiber.
In 1784, someone using a flintlock pistol shot Edward Culshaw. In those days, there were no bullets, as we know them. Gunpowder and a ball of lead were put into the gun’s muzzle and packed with paper wadding. A spark made when the gun’s hammer struck some flint at the back end of the barrel ignited the powder. When the constable examined Culshaw’s wound, he found a piece of newspaper used as wadding to pack the powder in the killer’s gun. The prime suspect in the killing was a man named John Toms. When a piece of newspaper found in Toms’ pocket was compared with the piece found in the wound, the pieces fit together like two pieces of a jigsaw puzzle. Based on the evidence, Toms was easily convicted. The Toms case was probably the first in America in which ballistics was used to solve a crime.
Everyone has heard a cashier one time or another mumble, “Paper or plastic?” as he put their groceries in a bag, but do shoppers know the effects of each vessel in which they carry their comestibles? There are many issues and benefits to both paper and plastic. The making and recycling of both paper and plastic bags can harm the environment. One must also look at the costs of making each bag. The convenience of each is also something to look at. Many people jump to conclusion that paper bags are better for the environment without knowing the facts. Since plastic bags are preferred by customers and plastic bags actually do not hurt the environment as much as paper ones do, consumers should feel at ease when choosing plastic.