Hominins Assignment Example | Topics and Well Written Essays - 500 words

Hominins - Assignment Example The original airing of the film was on March 27, 2003. It reveals the events that occurred nearly three million years ago (Turner 67). Professor Winston achieves to trace the history of humankind from the ape-man to the upright man. The film also captures the main points such as stone tool manufacture, meat eating, extended childhood, and bipedalism. The development stages start with an Afarensis, Lucy, also called the â€Å"First Ancestor.† The ape was the first primate to walk on two legs. Lucy’s societies engage in leadership conflict. The film focuses on the bipedality of the species. The second species is â€Å"Blood Bothers† that mainly dominates East Africa. The species consists of Homo habilis, Paranthropus boisei, and Homo rudolfensis. The third species in the tree is â€Å"Savage Family† which consists of Homo erectus and Homo ergaster (Barry, Robert, and Lynn 56). The setting of the species is Kenya and China. The last species in the species is â€Å"The Survivor† that includes Homo sapiens idaltu, Homo sapiens, Neanderthal and Homo heidelbergensis. The film has the strengths of enabling the audience to understand the evolution of human beings successfully. It presents the species as they occur in n orderly manner. It does well in covering the main these and events in human evolution. It gives detailed explanations on the environmental factors that could have influenced the species to acquire their distinct characteristics (Turner 79). The films use special effects from the latest scientific theories to enable the audience understand t easily. The film uses good visual effects that appeal to the audience. Though the film achieves to provide a comprehensive explanation about the evolution of human beings, it has some flaws. It uses a weak theory. For instance, it does not analyze the factors that the species were responding to when acquiring specific features. Strong theories should

The Effect of Milling on the Triboelectrification Properties of Literature review - 1

The Effect of Milling on the Triboelectrification Properties of Flurbiprofen Salts - Literature review Example This literature review seeks to investigate some of the electrostatic concepts as well as the potential effects of milling on the triboelectrification properties of Flurbiprofen salts. Electrostatics is a phenomenon which generally involves the build up of charges on the surfaces of particles and objects which are in contact with each other. One of the most fundamental equations commonly used in electrostatics is Coulombs law which effectively describe the force between any two point electric charges. According to Coulombs law, the magnitude of electrostatic force between any two point charges is dependent on the magnitude of each charge as well as the distance between the charges. The concept of work function generally refers to minimum energy (in electronvolts) required to remove an electron from a solid and transfer it to any point outside the surface of the solid. Work function represents the least amount of energy needed to get rid of the weakest electron from its location. Consequently, electrons are often moved to a function with the lower work function of the substance with a higher work function (Bailey, 1993). Based on these rules, Elajnaf’s group (2006) suggested a triboelectric sequence where the substance with the highest sequence, but with a lower work function would experience the highest level of electropositive charge when it came in contact with the substances in the lower sequence. Contact Potential difference is an important concept that can be used to measure the changes in work function of a particle surface. An electrostatic potential usually exists between any two dissimilar electrical materials (such as conductors and semiconductors with different electron work functions) which are brought into physical contact. According to Elajnaf et al. (2006, p.102), contact surface characteristics such as surface texture, surface resistivity and contamination and particle properties such as surface resistivity, crystal properties and