In all three versions of the hominid family tree, there are a number of similarities. Each tree must have an evolutionary origin and purpose and whilst the origin does seem to differ from tree to tree, the purpose seems to maintain a constant: Homo Sapiens are always the end point on each tree. Presumably, this is because our species has evolved this far to date and appears to have stayed still for about 200,000 years (Human Origins) whereas another site states 175,000 years (Becoming Human), and another states 100,000 years (PBS). This dispute is commonplace as we are ...
Teeth Reports Samples For Students
4 samples of this type
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Introduction
In most communities, family apartments were private spaces that offered a place of refuge and intimacy. Public spaces such as city squares were ideal for business dealings in addition to offices (Knowles, 2011, p. 130). This arrangement has since changed in the advent of information communication technology. Raymond Guess argues that the conception of privacy in modern times is where the identity of self-first has crumbled down (So-il.org, 2016). He goes further to observe that the community presently has the duty to promote and defend the security of individuals. Classic liberals are of the opinion that the basic right ...
Three phase induction motors
Introduction
The three-phase induction machine is the most widely used among the rotating machines. An induction machine offers an almost constant speed within its normal operating range when operated off a constant-voltage, constant-frequency, and with the electric power source. The cost of purchasing these machines is very low, and they require little maintenance. However, speed control is difficult and very expensive. Therefore, the rotor current of the three phase induction motors is not induced by electrical connections, but rather the rotation of magnetic field.
Squirrel Cage Rotor construction
The rotor type of the motor is made up of a laminated core which is ...
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Introduction
Wind energy has been in use as far back as 3000 B.C., when sailors in Egypt utilized this energy to move their boats. Today, wind energy is hailed as an important source of energy and is tapped in various regions around the world. Its importance stems from two factors: (1) it is renewable and (2) it is a clean source of energy that does not generate environmentally harmful emissions. To harness wind energy, a wind turbine is used. A turbine converts the kinetic energy of the wind into rotary mechanical energy, which can then be converted to electrical energy (“Wind turbine,” ...
