Feynman is a great physicist. His lectures are very useful for anyone who love physics.You can consult here:
http://www.feynmanlectures.caltech.edu/
Thursday, January 8, 2015
Titanium dioxide (TiO2)
Titanium
dioxide (TiO2) has plenty of applications such as white pigment in
pain, paper, confectionery etc. Morever, it has been widely as catalyst to air
and water treatment. This material is a semiconductor, it absorbs UV light.
Therefore, TiO2 is used as UV blocker in sunscreen. Recently, it is
used as photoactive material for solar panel. (Fujishima 2008). Moreover, in
biomaterial application, a nanolayer of TiO2 presents on Ti-based
implants.
The
most populous polymorph of TiO2 is anatase and rutile, which is
different from each other through the organization of Ti and O atoms inside the
crystal. (Diebold 2003)
The
properties of TiO2, thus its usage depends on the morphology of
particles. Therefore, new methods to control its size, shape at synthesis step are
essential. Litterature data indicated that scientists are able to manipulate
the exposed facets of TiO2 nanoparticles. Luc Brohan (IMN-Nantes)
for example, can synthesize 2D TiO2. (Vincent, Ph.D. disseration
2013, Université de Nantes). Other group in China was able to synthesize TiO2
anatase NPs which are prodominant by (001) facets. (Nature 2008)
Saturday, December 27, 2014
Natural selection
According to Darwin's theory on the evolution of species, natural selection is a process in which only the most adapted species survive and develop. This idea was also mentioned by Hertbert Spencer via phrase "survival of the fittest". Species adapt to the condition of environment, survive, reproduce, propagate.
The process of natural selection can be understood through some basic principle: competition and co-operation to survive.
Does human species follow this process? If so, every individual, group, nation must compete and co-operate to survive.
How about the weak people, will they disappear? Does natural selection process contradict with moral standard of human society? What is the paradox !
What are important things for us to do for the survival of the whole human species?
The process of natural selection can be understood through some basic principle: competition and co-operation to survive.
Does human species follow this process? If so, every individual, group, nation must compete and co-operate to survive.
How about the weak people, will they disappear? Does natural selection process contradict with moral standard of human society? What is the paradox !
What are important things for us to do for the survival of the whole human species?
Monday, December 22, 2014
Absolute zero temperature (0 K)
Hot or cold is normal expression of temperature. We use different scales to measure temperature such as Celsius (°C), Fahrenheit (F) or Kelvin (K). In science, K is the most populous. Zero K is equivalent with -273.15 °C.
Scientifically, temperature is the a way to decribe the vibration extent of particles (molecules, atoms, ...). The frequency of vibration is proportional to temperature. It is said that at zero K the vibration is ceased. Nevertheless, this confirmation is not certain and there are no proof because scientist can not reach zero K in the laboratory. MIT Scientist reached nanokelvin (http://newsoffice.mit.edu/2003/cooling) for atoms. To attain this ultralow temperature, Scientists used "gravito-magnetic trap" to trap the atoms by the effect of gravitation forces and magnetic forces.
At low temperature, atom moves slowly (1 inch in 30 seconds). At room temperature, the atom move faster at jet airplane speed.
Can we get zero K to know if the movement of atom is ceased ?
Scientifically, temperature is the a way to decribe the vibration extent of particles (molecules, atoms, ...). The frequency of vibration is proportional to temperature. It is said that at zero K the vibration is ceased. Nevertheless, this confirmation is not certain and there are no proof because scientist can not reach zero K in the laboratory. MIT Scientist reached nanokelvin (http://newsoffice.mit.edu/2003/cooling) for atoms. To attain this ultralow temperature, Scientists used "gravito-magnetic trap" to trap the atoms by the effect of gravitation forces and magnetic forces.
At low temperature, atom moves slowly (1 inch in 30 seconds). At room temperature, the atom move faster at jet airplane speed.
Can we get zero K to know if the movement of atom is ceased ?
Sunday, December 21, 2014
Motivation of actions
What is the motivation of the actions that we do every day?
To answer this question, there are several models to explain the phenomenon. Some get high credit such as that of Maslow. This author categorize the motivation according to the pyramic needs from the lowest to the highest: physiology, safety, social relations, social status and sert-acctualization. Another model that is quite popular in human resource management is ERG theory. ERG abbreviated for existence, relatedness and growth.
In spite of the effort, we rarely understand the nature of the motivation of all action. At basic level, all actions must facilitate the existence of human species. Other actions, in my opinion, just a mode of life drived by life style in moderned world. The younger generation copies and modifies a bit from the precedent generation. It is alike with the accumulation of human culture.
Human body (multicellular organization) function based on the exchange of matter (a form of energy) with surrounding environment. However, why it function as it does, we do not know. For example, why the cell divides to multiply itself? The human body is a mystery!
To answer this question, there are several models to explain the phenomenon. Some get high credit such as that of Maslow. This author categorize the motivation according to the pyramic needs from the lowest to the highest: physiology, safety, social relations, social status and sert-acctualization. Another model that is quite popular in human resource management is ERG theory. ERG abbreviated for existence, relatedness and growth.
In spite of the effort, we rarely understand the nature of the motivation of all action. At basic level, all actions must facilitate the existence of human species. Other actions, in my opinion, just a mode of life drived by life style in moderned world. The younger generation copies and modifies a bit from the precedent generation. It is alike with the accumulation of human culture.
Human body (multicellular organization) function based on the exchange of matter (a form of energy) with surrounding environment. However, why it function as it does, we do not know. For example, why the cell divides to multiply itself? The human body is a mystery!
Friday, December 19, 2014
Make life simpler?
Albert Einstein said "make everying as simple as possible but not simpler."
This great idea is aslo mentioned by Laozi, in Budddhist philosophy and may be inspired from the life of Jesus Christ.
In my personal experience, this idea or principle can apply to write scientific articles. I find that if I can write simply and give enough information in the article, which is the best.
Simple life must be wonderful. Nevertheless, I am in doubt that we can do this in the age of technology. For example: internet, mobile phone and money . Some others love fame, power. How addictive they are !!!
This great idea is aslo mentioned by Laozi, in Budddhist philosophy and may be inspired from the life of Jesus Christ.
In my personal experience, this idea or principle can apply to write scientific articles. I find that if I can write simply and give enough information in the article, which is the best.
Simple life must be wonderful. Nevertheless, I am in doubt that we can do this in the age of technology. For example: internet, mobile phone and money . Some others love fame, power. How addictive they are !!!
Tuesday, December 16, 2014
Why do electrons move?
One can ask why the electrons move surrounding the nucleus?
Well, I think nobody can answer this question completely. At this moment, you can say, wow God makes the electrons moved.
Well, I agree with you until someone else meets God and ask him if he does?
Or scientists find a fingerprint of God on the electron.
Nature is weird, we try to understand as much as we can.
Well, I think nobody can answer this question completely. At this moment, you can say, wow God makes the electrons moved.
Well, I agree with you until someone else meets God and ask him if he does?
Or scientists find a fingerprint of God on the electron.
Nature is weird, we try to understand as much as we can.
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