Friday, 23 January 2015

Rotary Motion

Rotary Motion

Rotational movement is the movement of a body, in which the distances of all points with each other and to a fixed axis of rotation remains the same. It is characterized by an angle of rotation, which characterizes the position of the body at any time.

Rotation spatially periodic rotational motion in which the system is performing full revolutions
The rotational movements used to describe sizes angle, angular velocity and angular acceleration corresponding position, velocity and acceleration in translation.

Angular displacement of a body is the circle in radians through which a line or point has been rotated in a particular sense about a individual axis. 

Angular acceleration is the rate of change in velocity. In SI system units, its unit is radians per second squared (rad/s2), and is frequently denoted by the Greek letter alpha (α).

The Human Heart

Human Heart

Task of the heart is to supply the oxygen and nutrient-rich blood body. This reaches the heart through regular contractions ("heartbeats").

Structure of the heart

The heart consists of four chambers, two atria and two so-called ventricles. The atria are connected to the chambers via the valves. The openings for the body and the pulmonary artery are also controlled via a flap.
From the heart chambers and heart valves

Cardiac cycle

In rhythmic, steady heartbeat filling phase and expulsion alternate regularly. This coordinated interplay is necessary to provide the body with enough blood.


The heart works independent (autonomous): specialized muscle cells from the excitements and pass them on. This system is called Erregungsbildungs- and conduction system.

Study at California

university of california

Visa students and courses

The F-1 visa

Who is it for?

Students wishing to conduct general education studies.

How do we do?

Prove that you have sufficient funds to study in the United States and we have every intention of coming home, after completing his studies. You will receive an I-20 (Certificate of admissibilité), this document attesting that you have the right to study in the United States.

For how long?

The total duration of the studies, as long as you are considered a full-time student, more than 60 days after the visa for your departure or prepare your transfer to another school.
The J-1 visa

Who is it for?

The interns in "sponsorship". There are 2 types of visas J-1, J-1 "Trainee" and the J-1 "Intern". The J-1 visa "Intern" is awarded to graduates or students under a year, and J-1 "Trainee" young professionals with a degree in higher education and one year of experience outside the United UNite or 5 years without a diploma of higher education.

How do we do?

Choose a course that matches their field of study or professional skills.
For how long?
12 months for the Intern, 18 months for the Trainee.



Hemoglobin is a protein found in red blood cells and responsible for the red color. It exists in several forms, including hemoglobin A1 representing 98% of the hemoglobin of a normal individual.

In the fetus, there are hemoglobin F hemoglobins and some, such as S responsible for sickle cell anemia, are associated with diseases called hemoglobinopathies. Hemoglobin main function is to transport oxygen molecules to organs and tissues through the bloodstream.

After the breakdown of red blood cells, a portion of the hemoglobin will be transformed by several reactions bilirubin compound that gives the yellow color of urine and stercobilin giving its brown color to the stool. The normal amount of hemoglobin is between 13 and 18 grams per liter of blood in humans.

Melting Point

Melting Point

The melting point is the amount of heat at which a solid changes into the liquid at atmospheric pressure. During change of state of a pure substance, the temperature remains constant since all the heat is used in the fusion process. Thus the melting point of pure substances defined and reproducible, and it can be used to identify a product, if it has been previously reported.

The presence of impurities has considerable influence on the melting point. According to Raoult's law all solute produces a freezing-point depression, or a decrease in the melting temperature. Act solute impurities and decrease the melting point of the main substance solvent. If there is a significant amount of impurity, the mixture may have a wide range of temperatures in which melting point is observed.
Thus it is noted that:

a) The pure solids have a stable melting point and melted in a small temperature range.

b) The presence of impure metal lowers the melting point and causes the sample based on a wide temperature range.

c) The presence of moisture or solvent gives incorrect fusion points.