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Electromagnetism Generator

Wed, 10 Feb 2010 04:34:43 +0100

A simple generator is similar to an electric motor.
With a motor, we put electrical energy in and get rotational energy out,
with a generator we put rotational energy in and get electrical energy out.

As with the motor, the current direction changes
with each half turn of the generator.
The generator produces alternating current
because slip rings are used in place of a split - ring commutator.

The slip rings keep a continuous connection
with the wire around the armature (continued).

If a simple electric motor with a split - ring commutator
is used to generate electricity, you do not get alternating current.
A different type of electrical output is produced.

Creat website

Mon, 04 Jan 2010 04:03:14 +0100

if you know how to create a website. It will be easy for you to look for a goog job. Many job in Thailand now really want a person who can create a website. I've learn many tecnique since I create a website in yola. I've know how to bring a world map to my website. How to create a wibgets. At first, I think I would be very bored because I'm not good at computer. But Teacher Simon teach us with his own tecnique that make students understand quickly. Create a website is not very hard as I think at first.

The Four Noble Truths

Mon, 04 Jan 2010 03:53:29 +0100

The Four Noble Truths

1. Life means suffering.

2. The origin of suffering is attachment.

3. The cessation of suffering is attainable.

4. The path to the cessation of suffering.

1. Life means suffering.

To live means to suffer, because the human nature is not perfect and neither is the world we live in. During our lifetime, we inevitably have to endure physical suffering such as pain, sickness, injury, tiredness, old age, and eventually death; and we have to endure psychological suffering like sadness, fear, frustration, disappointment, and depression. Although there are different degrees of suffering and there are also positive experiences in life that we perceive as the opposite of suffering, such as ease, comfort and happiness, life in its totality is imperfect and incomplete, because our world is subject to impermanence. This means we are never able to keep permanently what we strive for, and just as happy moments pass by, we ourselves and our loved ones will pass away one day, too.

2. The origin of suffering is attachment.

The origin of suffering is attachment to transient things and the ignorance thereof. Transient things do not only include the physical objects that surround us, but also ideas, and -in a greater sense- all objects of our perception. Ignorance is the lack of understanding of how our mind is attached to impermanent things. The reasons for suffering are desire, passion, ardour, pursuit of wealth and prestige, striving for fame and popularity, or in short: craving and clinging. Because the objects of our attachment are transient, their loss is inevitable, thus suffering will necessarily follow. Objects of attachment also include the idea of a "self" which is a delusion, because there is no abiding self. What we call "self" is just an imagined entity, and we are merely a part of the ceaseless becoming of the universe.

3. The cessation of suffering is attainable.

The cessation of suffering can be attained through nirodha. Nirodha means the unmaking of sensual craving and conceptual attachment. The third noble truth expresses the idea that suffering can be ended by attaining dispassion. Nirodha extinguishes all forms of clinging and attachment. This means that suffering can be overcome through human activity, simply by removing the cause of suffering. Attaining and perfecting dispassion is a process of many levels that ultimately results in the state of Nirvana. Nirvana means freedom from all worries, troubles, complexes, fabrications and ideas. Nirvana is not comprehensible for those who have not attained it.

4. The path to the cessation of suffering.

There is a path to the end of suffering - a gradual path of self-improvement, which is described more detailed in the Eightfold Path. It is the middle way between the two extremes of excessive self-indulgence (hedonism) and excessive self-mortification (asceticism); and it leads to the end of the cycle of rebirth. The latter quality discerns it from other paths which are merely "wandering on the wheel of becoming", because these do not have a final object. The path to the end of suffering can extend over many lifetimes, throughout which every individual rebirth is subject to karmic conditioning. Craving, ignorance, delusions, and its effects will disappear gradually, as progress is made on the path.

First conditional

Mon, 04 Jan 2010 03:50:17 +0100

First Conditional: real possibility

We are talking about the future. We are thinking about a particular condition or situation in the future, and the result of this condition. There is a real possibility that this condition will happen. For example, it is morning. You are at home. You plan to play tennis this afternoon. But there are some clouds in the sky. Imagine that it rains. What will you do?

IF	condition	result
	present simple	WILL + base verb
If	it rains	I will stay at home.

Notice that we are thinking about a future condition. It is not raining yet. But the sky is cloudy and you think that it could rain. We use the present simple tense to talk about the possible future condition. We use WILL + base verb to talk about the possible future result. The important thing about the first conditional is that there is a real possibility that the condition will happen. Here are some more examples (do you remember the two basic structures: [IF condition result] and [result IF condition]?):

IF	condition	result
	present simple	WILL + base verb
If	I see Mary	I will tell her.
If	Tara is free tomorrow	he will invite her.
If	they do not pass their exam	their teacher will be sad.
If	it rains tomorrow	will you stay at home?
If	it rains tomorrow	what will you do?

result	IF	condition
WILL + base verb		present simple
I will tell Mary	if	I see her.
He will invite Tara	if	she is free tomorrow.
Their teacher will be sad	if	they do not pass their exam.
Will you stay at home	if	it rains tomorrow?
What will you do	if	it rains tomorrow?

The noble eightfold path

Mon, 04 Jan 2010 03:52:39 +0100

The Noble Eightfold Path describes the way to the end of suffering, as it was laid out by Siddhartha Gautama. It is a practical guideline to ethical and mental development with the goal of freeing the individual from attachments and delusions; and it finally leads to understanding the truth about all things. Together with the Four Noble Truths it constitutes the gist of Buddhism. Great emphasis is put on the practical aspect, because it is only through practice that one can attain a higher level of existence and finally reach Nirvana. The eight aspects of the path are not to be understood as a sequence of single steps, instead they are highly interdependent principles that have to be seen in relationship with each other.

1. Right View

Right view is the beginning and the end of the path, it simply means to see and to understand things as they really are and to realise the Four Noble Truth. As such, right view is the cognitive aspect of wisdom. It means to see things through, to grasp the impermanent and imperfect nature of worldly objects and ideas, and to understand the law of karma and karmic conditioning. Right view is not necessarily an intellectual capacity, just as wisdom is not just a matter of intelligence. Instead, right view is attained, sustained, and enhanced through all capacities of mind. It begins with the intuitive insight that all beings are subject to suffering and it ends with complete understanding of the true nature of all things. Since our view of the world forms our thoughts and our actions, right view yields right thoughts and right actions.

2. Right Intention

While right view refers to the cognitive aspect of wisdom, right intention refers to the volitional aspect, i.e. the kind of mental energy that controls our actions. Right intention can be described best as commitment to ethical and mental self-improvement. Buddha distinguishes three types of right intentions: 1. the intention of renunciation, which means resistance to the pull of desire, 2. the intention of good will, meaning resistance to feelings of anger and aversion, and 3. the intention of harmlessness, meaning not to think or act cruelly, violently, or aggressively, and to develop compassion.

3. Right Speech

Right speech is the first principle of ethical conduct in the eightfold path. Ethical conduct is viewed as a guideline to moral discipline, which supports the other principles of the path. This aspect is not self-sufficient, however, essential, because mental purification can only be achieved through the cultivation of ethical conduct. The importance of speech in the context of Buddhist ethics is obvious: words can break or save lives, make enemies or friends, start war or create peace. Buddha explained right speech as follows: 1. to abstain from false speech, especially not to tell deliberate lies and not to speak deceitfully, 2. to abstain from slanderous speech and not to use words maliciously against others, 3. to abstain from harsh words that offend or hurt others, and 4. to abstain from idle chatter that lacks purpose or depth. Positively phrased, this means to tell the truth, to speak friendly, warm, and gently and to talk only when necessary.

4. Right Action

The second ethical principle, right action, involves the body as natural means of expression, as it refers to deeds that involve bodily actions. Unwholesome actions lead to unsound states of mind, while wholesome actions lead to sound states of mind. Again, the principle is explained in terms of abstinence: right action means 1. to abstain from harming sentient beings, especially to abstain from taking life (including suicide) and doing harm intentionally or delinquently, 2. to abstain from taking what is not given, which includes stealing, robbery, fraud, deceitfulness, and dishonesty, and 3. to abstain from sexual misconduct. Positively formulated, right action means to act kindly and compassionately, to be honest, to respect the belongings of others, and to keep sexual relationships harmless to others. Further details regarding the concrete meaning of right action can be found in the Precepts.

5. Right Livelihood

Right livelihood means that one should earn one's living in a righteous way and that wealth should be gained legally and peacefully. The Buddha mentions four specific activities that harm other beings and that one should avoid for this reason: 1. dealing in weapons, 2. dealing in living beings (including raising animals for slaughter as well as slave trade and prostitution), 3. working in meat production and butchery, and 4. selling intoxicants and poisons, such as alcohol and drugs. Furthermore any other occupation that would violate the principles of right speech and right action should be avoided.

6. Right Effort

Right effort can be seen as a prerequisite for the other principles of the path. Without effort, which is in itself an act of will, nothing can be achieved, whereas misguided effort distracts the mind from its task, and confusion will be the consequence. Mental energy is the force behind right effort; it can occur in either wholesome or unwholesome states. The same type of energy that fuels desire, envy, aggression, and violence can on the other side fuel self-discipline, honesty, benevolence, and kindness. Right effort is detailed in four types of endeavours that rank in ascending order of perfection: 1. to prevent the arising of unarisen unwholesome states, 2. to abandon unwholesome states that have already arisen, 3. to arouse wholesome states that have not yet arisen, and 4. to maintain and perfect wholesome states already arisen.

7. Right Mindfulness

Right mindfulness is the controlled and perfected faculty of cognition. It is the mental ability to see things as they are, with clear consciousness. Usually, the cognitive process begins with an impression induced by perception, or by a thought, but then it does not stay with the mere impression. Instead, we almost always conceptualise sense impressions and thoughts immediately. We interpret them and set them in relation to other thoughts and experiences, which naturally go beyond the facticity of the original impression. The mind then posits concepts, joins concepts into constructs, and weaves those constructs into complex interpretative schemes. All this happens only half consciously, and as a result we often see things obscured. Right mindfulness is anchored in clear perception and it penetrates impressions without getting carried away. Right mindfulness enables us to be aware of the process of conceptualisation in a way that we actively observe and control the way our thoughts go. Buddha accounted for this as the four foundations of mindfulness: 1. contemplation of the body, 2. contemplation of feeling (repulsive, attractive, or neutral), 3. contemplation of the state of mind, and 4. contemplation of the phenomena.

8. Right Concentration

The eighth principle of the path, right concentration, refers to the development of a mental force that occurs in natural consciousness, although at a relatively low level of intensity, namely concentration. Concentration in this context is described as one-pointedness of mind, meaning a state where all mental faculties are unified and directed onto one particular object. Right concentration for the purpose of the eightfold path means wholesome concentration, i.e. concentration on wholesome thoughts and actions. The Buddhist method of choice to develop right concentration is through the practice of meditation. The meditating mind focuses on a selected object. It first directs itself onto it, then sustains concentration, and finally intensifies concentration step by step. Through this practice it becomes natural to apply elevated levels concentration also in everyday situations.

Exponential function

Mon, 04 Jan 2010 03:40:58 +0100

In mathematics, the exponential function is the function e^x, where e is the number (approximately 2.718281828) such that the function e^x equals its own derivative. The exponential function is used to model phenomena when a constant change in the independent variable gives the same proportional change (increase or decrease) in the dependent variable. The exponential function is also often written as exp(x), especially when x is an expression complicated enough to make typesetting it as an exponent unwieldy.

The graph of y = e^x is upward-sloping, and increases faster as x increases. The graph always lies above the x-axis but can get arbitrarily close to it for negative x; thus, the x-axis is a horizontal asymptote. The slope of the graph at each point is equal to its y coordinate at that point. The inverse function is the natural logarithm ln(x); because of this, some older sources refer to the exponential function as the anti-logarithm.

Sometimes the term exponential function is used more generally for functions of the form cb^x, where the base b is any positive real number, not necessarily e. See exponential growth for this usage.

In general, the variabole x can be any real or complex number, or even an entirely different kind of mathematic object; see the formal definition below.

The Cell Cycle & Mitosis

Mon, 21 Dec 2009 04:52:56 +0100

What is (and is not) mitosis?

Mitosis is nuclear division plus cytokinesis, and produces two identical daughter cells during prophase, prometaphase, metaphase, anaphase, and telophase. Interphase is often included in discussions of mitosis, but interphase is technically not part of mitosis, but rather encompasses stages G1, S, and G2 of the cell cycle.

Interphase & mitosis

Interphase

The cell is engaged in metabolic activity and performing its prepare for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. The cell may contain a pair of centrioles (or microtubule organizing centers in plants) both of which are organizational sites for microtubules.

Prophase

Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes. The nucleolus disappears. Centrioles begin moving to opposite ends of the cell and fibers extend from the centromeres. Some fibers cross the cell to form the mitotic spindle.

Prometaphase

The nuclear membrane dissolves, marking the beginning of prometaphase. Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving.

Metaphase

Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.

Anaphase

The paired chromosomes separate at the kinetochores and move to opposite sides of the cell. Motion results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.

Telophase

Chromatids arrive at opposite poles of cell, and new membranes form around the daughter nuclei. The chromosomes disperse and are no longer visible under the light microscope. The spindle fibers disperse, and cytokinesis or the partitioning of the cell may also begin during this stage.

Cytokinesis

In animal cells, cytokinesis results when a fiber ring composed of a protein called actin around the center of the cell contracts pinching the cell into two daughter cells, each with one nucleus. In plant cells, the rigid wall requires that a cell plate be synthesized between the two daughter cells.

Muscular System

Mon, 21 Dec 2009 04:17:02 +0100

Over 600 skeletal muscles function for body movement through contraction and relaxation of voluntary, striated muscle fibers. These muscles are attached to bones, and are typically under conscious control for locomotion, facial expressions, posture, and other body movements. Muscles account for approximately 40 percent of body weight. The metabolism that occurs in this large mass-produces heat essential for the maintenance of body temperature.

Vesaka puja day

Mon, 21 Dec 2009 03:35:31 +0100

As we recall the Buddha and his Enlightenment, we are immediately reminded of the unique and most profound knowledge and insight which arose in him on the night of his Enlightenment. This coincided with three important events which took place, corresponding to the three watches or periods of the night

The heart of the Teachings of the Buddha is contained in the teachings of the Four Noble Truths, namely

The Noble Truth of Dukkha or suffering
The Origin or Cause of suffering
The End or Cessation of suffering
the Path which leads to the cessation of all sufferings

My october holiday

Mon, 14 Dec 2009 04:19:52 +0100

I had a boring time during my month-long holiday in Octorber.I played games with my brother for most of Octorber.The game were called “DotA” and “Mario” .It was boring because we played too much.I played football with my friends everyday.It was fun because we won! . I went to shopping at Lotus. Iwent shopping with my friends.It was boring because I Do not have any money. I also had extra classes. I studied with Ping at AUA. It was exciting because I saw A.Robert and A.Arthur. I stayed at home for most of holiday. It was boring because There was notthing to do. Althogether, It was not an exciting holiday.