The micro hardness of the prepared samples were obtained by using a Vickers Micro hardness Tester (Model : Leco LV 700, USA). 5 readings were taken for each sample to calculate the average hardness. An indentation load of 5gf was used. After calculating the average hardness for each sample, mean variance and standard deviation (S.D.) was calculated to check the consistency of the data.
US Army Correspondence. (2000). METAL PROPERTIES, CHARACTERISTICS,. US ARMY REPAIR SHOP TECHNICIAN WARRANT. Retrieved from www.hnsa.org/doc/pdf/metal-properties
A microhardness measurement is done using the Mitutoyo micro hardness tester (load range 10 g to 2 Kg) for two samples. The measurements are taken at various radial locations on deformed pins to assess their work hardening. For the micro hardness test procedure, ASTM E-384 is followed to measure hardness value and the values are averaged. Sample preparation is necessary with a micro hardness test in order to provide a small enough specimen that can fit into the tester (Fig. 10).
Die-forming of sheet metal has been around for thousands of years. Originally the metal was manipulated by hand and hammered into the depression, by utilizing crude grooves carved into wood or stone. This technique was used to make spouts, handles, and other forms. Since then, however; they have undergone a remarkable technological evolution. Mate-female conforming dies to create hollow forms by using hydraulic pressure or drop hammer pressure, changed die-forming forever (Paisin, 2013).
In Jared Diamond’s excerpt from his book, Guns, Germs, and Steel, he puts forward the historical narrative of how human evolution progresses at varying rates for different cultures due solely to the particular geographic region that people assimilate from. Diamond supports this thesis with specific evidence on the importance of food production, emphasizing that food is the main ingredient needed for a population to experience progress and growth, enabling that culture to expand around the world. I agree with Diamond’s dissertation and find it compelling due to his logical evidence and ethos on the topic.
Cold rolling in combination with annealing in a controlled atmosphere furnace, by grinding with abrasives, or by buffing a finely ground surface
The selling and obtaining of Blood diamonds is occurring in African nations, such as: Sierra Leone, Liberia, Ivory Coastand, Angola, and the Democratic Republic of Congo. The problem with blood diamonds is they are obtained by violent conflict, human rights abuse, and war. Blood diamonds have cause wars in Côte d’Ivoire, Sierra Leone, Democratic Republic of Congo and Liberia. Diamonds have also been used by terrorist groups such as Al-Qaeda to finance their activities. Blood diamonds get their name not because of a red tint but because they were obtained in an illegal way. Citizens would be taken as slaves and put to work into mines for the mining of diamonds.
Hatchet Essay
Weapons, Shelter, and Fire. Are all crucial things needed to survive in Hatchet by Gary Paulsen. In Hatchet a thirteen year old boy flies with a pilot to see his dad in canada. His name is Brian Robeson Brian is a city boy he is coming all the way from Hampton, New York.
In the novel Hatchet, by Gary Paulsen, Brian has to endure intense confinement from his relaxing old life in the city. He has to adjust his specific type of living into a productive and lonely lifestyle. Brian has been isolated and had to let go of his old life. This life enriched him so he can learn what it is like to be lonesome for a long period of time, and not to always have someone always on his shoulder. He goes from a happy city life to being divided by society. He lost all the resources he could use to a separate and solitary environment.
Avenged Sevenfold's debut album, Sounding the Seventh Trumpet, released on their first label, Good Life Recordings, in 2001. Taking its name from the Book of Revelation, the album references the sounding of the last (seventh) trumpet, signaling the end of the world. Even though the album only sold 300 copies in its first week of release,it currently has sold 370,000 copies worldwide as of November 2010. Sounding the Seventh Trumpet is widely agreed as Avenged Sevenfold's heaviest album, with chugging guitars, very little clean vocals, and ferocious in your face drumming by The Rev. When the members began making the album, The Rev used his amazing improvisational skills and recorded all of the drums for the album in one take, and the other members added their parts onto The Rev's foundation.