Hardness test In this study hardness was determined using standard Rockwell A. The tests were conducted at room temperature and under ambient humidity conditions. Hardness testing machine (Avery Denison 6407 150Kgf) was used in the test. Tension test Tension tests were carried out on the various silica, alumina and carbon nanophased epoxy specimens according to DIN 53457 [15]. The test specimens were cut into strips of 170 mm length, 15 mm width and 3 mm thickness. Tension tests were carried out using a universal testing machine (LLOYD Instruments LR 300kN). The cross-head speed of the loading member was 2 mm/min. Six specimens are tested for each composition and the average value is calculated. The strain guage results are further monitored …show more content…
Theoretical prediction of tensile modulus Young’s modulus is the stiffness of a material at the elastic stage of the deformation process. It is enhanced by adding micro and nano-particles to a polymer matrix as hard particles have much higher stiffness than the matrix [16]. There are 181 Page 2 of 12 J Polym Res (2016) 23:181 many theoretical models [16] such as Paul model, Modified rule of mixtures model, and Counto model thatmay be used to predict the moduli of particulate polymeric composites. It is to be noted that these models make a number of assumptions. They assume that matrix and particles are linear-elastic, isotropic and there is perfect bonding between the particles and matrix. The particles are also assumed to be uniform in their aspect ratio and perfectly aligned in the direction of with the applied load. Models ignore any agglomeration and particleparticle interactions. The Paul model Paul [17, 18] assumed that the two components are in a state of macroscopically homogeneous stress and adhesion is perfect at the interface of a cubic inclusion in a cubic matrix. When a uniform stress is applied on the boundary, the elastic modulus of the particulate composite is given by: EC ¼ EM 1 þ ðm−1ÞV
From the start of the American Civil War, 1860, until the end of the Reconstruction, 1877, the United States of America endured what can be considered a revolution. Prior to the year 1860, there was a lack of union because of central government power flourishing rather than state power. Therefore, there was a split of opposite sides, North and South, fighting for authority. One major issue that came into mind was of slavery. At first, there were enactments that were issued to limit or rather prevent conflict to erupt, such as the numerous compromises, Missouri Compromise and the Compromise of 1850. They did not fulfill the needs of the states, South states in particular; therefore, in the year 1860, the Civil War had commenced. There was the issue of inequality of Blacks in suffrage, politics, and the use of public facilities. However, much constitutional and social advancement in the period culminated in the revolution. To a radical extent, constitutional development between 1860 and 1877 amount to a revolution because of events like the Emancipation Proclamation, Civil Rights Act, the amendments that tried to change African Americans lives in American Society and contributed to get the union together. There is the social developments as well that to a lesser extent had amounted to the revolution because of organizations like the Klu Klux Klan, Freedmen’s Bureau lacking, and discrimination against African Americans that caused progression of violence and white supremacy.
Thousands of students around the country and around the world will be preparing for the SAT and ACT tests while trying to maintain a high GPA. These tests will potentially have a significant impact on students lives. Some will be taking these tests for the second or even third time to get that 1500 out of 1600 or that 33 out of 36, that they long desire.
This story is that, during the mid 21 century, because of the thaw of the iceberg that was floating in the Arctic, thus human created the Artificial Intelligence to help themselves to face the terrible environment easily. David is a robot like them. But he is the only one that is written into the love. As the first robot has love, he became the experimental article to be a kid for a couple who lost their son. As the time goes by, David still can’t join this family, and the couple thinks he can’t rather than their son exactly, so they make a decision to send to the company that created him to destroy him. However, they didn’t want to finally, but David can’t stay with them anymore. David thinks they don’t like him because he is not a real boy, if he can be a real boy, he will hear stories by his mother before he goes to bed, although he never need to sleep. So he still has a dream that one day, he will be a real boy, because he wants to be with his mother. His best friend and guide, Teddy helped him to find his dream and he says he will see him become a real boy. There is only one hope, Blue Fairy can help him to achieve him dream. However, you know, he did find her, but he was freezed with his best hope, Blue Fairy...
Denture teeth can be made of acrylic poly(methyl methacrylate) (PMMA) or composite resins. PMMA is a polymer - a material made the from joining of methyl methacrylate monomers. Properties of PMMA include resistance to abrasion, chemical stability and a high boiling point. (Jun Shen et al. 2011). However, weak flexure and impact strength of PMMA are of concern as they account for denture failure. (Bolayir G, Boztug A and Soygun K. 2013). Composite denture teeth are made of a three distinct phases - filler, matrix and coupling agents. Out of the types of composite teeth available, nano-filled composite teeth are preferred. Composite teeth have a PMMA coating around the tooth and a high content of filler particles. This gives them strength, higher resistance to forces than acrylic teeth and provides compete polymerization due to the PMMA coating. (Anusavice, K. J., Phillips, R. W., Shen, C., & Rawls, H. R, 2012). If the interface between the PMMA denture base and PMMA or composite teeth was weak, the denture will not be able to sustain occlusal forces, making the base-teeth interface, an entity of significance.
While I currently could not describe how The 4 Way Test has guided how I run my business, The 4 Way Test has aligned with my personal morals/ethics and has been prevalent in my personal life and activities. Over the past four years of high school I’ve been involved with the show choir and the four way test has help guide me through my four years especially this year as the co-president. When I was required to make decision I had to think what was the best for the group. For example as we got closer to our show one of our songs with not ready to be performed and it came time that we had to cut the song from the show even though I personally loved the song. It was the truth that the song was simply not ready, it was fair to all as we all did not know our
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.
This paper gives some insight into the vast subject of artificial intelligence and its use in the business world. Artificial intelligence is an incredibly interesting topic; it is used throughout the world in many different applications. Many do not know what artificial intelligence is or how it used, even though they are surrounded by it on a daily basis. To learn more about this topic it is important to do extensive research online by reading many different academic journals and articles. This paper will give the reader a better understanding of artificial intelligence and how it is being used in transportation and manufacturing businesses. These are just two small sections in the wide subject of AI (artificial intelligence) but give a bigger
The Smart Measure test shows that that I have a logical learning style. I learn better using pie charts, and just flat out fact. When numbers and figures get put out there it draws my attention straight to it. Shockingly, I did scores three way for Physical, Social, and Verbal learning. They ere all very close o my score in logical learning. Basically, I am capable of learning in all sorts of different ways. Wehn it comes to learning I like to use a variety of techniques to ensure that I have obtained the the material that was necessary.
In taking the multiple choice practice test over one hour I answered 30 questions correct out of 54. I feel like I did not do the best that I could on this test but at the same time it has given me insight to what I need to work on harder for the actual test.
The development of composite material in the aerospace industry started when Douglas Aircraft Company bought the first roll of fiberglass shipped to the west coast because they believed that the fiberglass would help them solve a production problem. During the production process, the plastic molds were aimed to be reinforced with fiberglass such that it would become strong enough to allow at least a few parts to be made so that the new designs could be quickly verified. Indeed the fiberglass reinforcement did in fact prove to be stronger and it was a successful process. Moreover, new composites were made from fiberglass material and phenolic resin which the only resin available at the time. This was indeed a successful period for composite materials and more interest were attracted by many applications.
In a relatively short period of time, carbon fiber revolutionized the manufacturing industry due to its low weight and superb structural properties. Carbon fiber is a composite material. Composite carbon fiber is composed of a woven carbon fiber which reinforces a polymer resin (usually epoxy) [3]. The carbon fibers themselves are polymers of graphite (which has a hexagonal sheet structure) rolled into a thin filament [2]. The tensile strength (resistance to tearing from being pulled) and Young’s Modulus (force required to stretch or compress a material) are extremely high in relation to the fiber’s weight. The internal strength of carbon fiber lies in the structure of the weave and the impact resistance comes from the hard plastic polymer shell. This paper will focus on the production process of Polyacrylonitrile (PAN) carbon fiber, the applications of carbon fiber in industry, and the future applications of this revolutionary
The claim the title presents seems to be an obvious one when examined briefly. However, when examining the title closely the language used must be considered, specifically, the key word, “neutral”. A neutral question is an unbiased question that does not imply a specific answer, limits thinking, or guides into a predestined train of thought. When examined from this view, it can be said that all questions are asked with a purpose and demand an answer limited to a finite number, and therefore lose their neutrality. However, a neutral question can also be an objective question that is answered clearly with no deviation and is disengaged from the answer given to it. It can be a question based on an examination of facts where only one answer is possible, and since the presence of bias depends on the existence of multiple views, it can be said that
Particle-reinforced composites move into two divisions which are large particles and dispersion-strength. Large particles go under the condition which the contact between particle-matrix cannot be treated on the atomic or molecule level, whereas a different way such continuum mechanics is used. The filler used for particle-reinforced composites usually alternate the properties of the material or could substitute some of the polymer volume with cheaper material. In this case, the smaller and the more evenly spread throughout the matrix the particles are, there is an increasing of effective reinforcement. A good example of a large-particle composite is concrete [1]. In the other hand of particle-reinforcement composites, the dispersed particles are considered small which allows...
Artificial intelligence was the most popular phenomenon of the decade of 1950s. Since then, there has been much debate about its impact on society especially in terms of human dignity, unemployment, and environmental damage.
There I was sitting in my eighth grade graduation ceremony ready to be rewarded for the hard work I had put in throughout the whole year. A year of ups and downs, tears, and the words “I can’t” said many times by my biggest obstacle and enemy myself. They say hard work always pays off, or at least that’s what I thought.