Nucleosynthesis essays

Nucleosynthesis essays The "big bang" which created the universe, only created the elements Hydrogen (H) and Helium (He) and possibly a very small amount of Lithium (Li). However, a glance at the periodic table of the elements shows that today (some 15 billion years after the big bang) there are at least 108 known elements. Every atom of every element heavier than Li has been produced since the big bang! The "factories" which make these elements are stars. "Nucleosynthesis" or the synthesis of nuclei, is the process by which stars (which start out consisting mostly of H and He) produce all other elements. The key is nuclear fusion, in which small nuclei are joined together to form a larger nucleus. (This contrasts with nuclear fission, in which a large nucleus breaks apart to form two smaller nuclei). Fusion requires an extremely large amount of energy (see fig. 1), and can typically only take place in the centers of stars. a) Low energy proton is strongly repelled by the 7Be nucleus.b) High energy proton moves so fast that it can strike the 7Be nucleus. Once the proton touches the nucleus, it has a chance to stick. If the proton sticks, the 7Be becomes a 8B nucleus.c) 8B is radioactive and changes into 8Be plus a positron (b+) and a neutrino (n). 8Be is itself radioactive, and almost immediately breaks into two 4He nuclei. Protons repel each other. This repulsion becomes stronger as the protons get closer together (just like when you try to stick two magnets together north to north, or south to south. Try this! As you push the magnets closer together, it becomes harder to do). However, if the protons can actually touch each other, they have a chance to stick together! This is because of the "strong nuclear force" which attracts nucleons (protons or neutrons) together, and is much stronger (at close range) than the "electromagnetic force" repulsion that makes protons repel other protons. (Magnets do not do this: two like poles wi...

Essay on Bipolar Disorder

Essay on Bipolar Disorder According to the National Institution of Mental Habits, bipolar disorder is characterized by extreme mood changes, from manic episodes of intense energy, followed by extreme lows of depression. Quite a few of the history’s best artists, entertainers and athletes and the like have or have had Bipolar Disorder – whether diagnosed or not. This includes crooner Frank Sinatra, 1960s icon Jimi Hendrix, ’90s rocker Curt Kobain, painter Vincent Van Gogh, tons of writers, and even actress Catherine Zeta-Jones, among too many others. Sometimes called â€Å"Manic Depression,† Bipolar Disorder affects 2.5 percent of the U.S. population. It is characterized by extreme mood changes, from manic episodes of intense energy, followed by extreme lows of depression, according to the National Institution of Mental Habits. Bipolar Disorder is difficult to diagnose, even to experts, because there are so many different varieties of Bipolar Disorder and Depression. Reasons of Bipolar Disorder Many factors can be attributed to the reason a person experiences Bipolar Disorder. It can be due to their genetics, as in how they may have inherited from their parents the gene for Bipolar Disorder. It could be brought on by drug and alcohol abuse and addiction; it is a much-known fact that substance abuse is very common among people with Bipolar Disorder, the reasons for which are unclear. However, it is speculated that people with Bipolar Disorder may treat their symptoms with alcohol or drugs. It is also known that substance abuse can trigger, or even prolong, mental illness, including mood disorders. Naturally, medications exist for Bipolar Disorder, and they have been known to help alter a person’s brain chemistry so that their mood is balanced and steady. After a person is diagnosed with Bipolar Disorder, they are most always given medication to combat the intense symptoms. RELIEVING STUDENTS SCHOOL-RELATED STRESS However, lifestyle choices can also potentially help a person manage their mental illness or mood disorder. This extends to drinking habits and drug-taking habits, as said before, but stress, diet, exercise habits and overall health play a crucial role, too. Moderation and self-discipline are always key. Exercise has a way of balancing the firing of neurotransmitters in the brain, which play a crucial role in mood, behavior and cognition and happiness. It is a proven fact that exercise and physical health are fundamental to good mental health, as well, in part because it helps relieve stress and tension and it also encourages the body to work properly and effectively. How to Deal with Mood  Disorder? One of the scariest things about any mood disorder is the way it becomes insurmountable to deal with and tackle. In other words, some people experience horrific Bipolar episodes and fear they will have to deal with the uncertainty and unpredictability of it for the rest of their lives. It affects every single aspect of one’s life. Unfortunately, this all too often tricks people into thinking they are better off committing suicide, ending their life, the pain, the depression. This is because the person with Bipolar Disorder experiences a high so high that they feel they can do anything, become a better person, be successful and happy and productive and wealthy. They get ideas and missions, create objectives, and they get powerfully motivated to do something. However, this high, the manic state, can directly follow a Depression so crippling that they feel the Manic state they just experienced was mostly just to tease them – that they could never be happy or at least not h appy for too long. To conclude, Bipolar Disorder exists and it’s an issue worth paying attention to. It is something that affects people from all walks of life, cultures, professions, philosophies – and it affects various – if not all – aspects of their life, as well, almost always in a detrimental way. It can keep a person from sleeping well at night, from eating and interacting with people, from doing things they enjoy, even things they have to do – like going to work and other responsibilities. Even simple things like doing laundry can be a struggle for people with Bipolar Disorder or with any variation of Depression. What is most tragic about Bipolar Disorder is the fact that it can occur suddenly and without any warning – it just happens. Nothing, in particular, may trigger it. Bipolar Disorder doesn’t discriminate by wealth, ethnicity, and religious creed. But it is a problem all over the world – and it is just as serious as cancer is.