So, I shouldn't be looking for a theoretical physicist on string theory. Maybe the meows meows can help me!
- Pic from Internet
- wong chee tat :)
Showing posts with label maths. Show all posts
Showing posts with label maths. Show all posts
Tuesday, July 26, 2016
String Theory
So, I shouldn't be looking for a theoretical physicist on string theory. Maybe the meows meows can help me!
- Pic from Internet
- wong chee tat :)
Saturday, November 23, 2013
Plants 'do maths' to control overnight food supplies
Plants 'do maths' to control overnight food supplies
By Helen BriggsBBC News
Arabidopsis Arabidopsis thaliana: A model plant for scientific experiments
Plants have a built-in capacity to do maths, which helps them regulate food reserves at night, research suggests.
UK scientists say they were "amazed" to find an example of such a sophisticated arithmetic calculation in biology.
Mathematical models show that the amount of starch consumed overnight is calculated by division in a process involving leaf chemicals, a John Innes Centre team reports in e-Life journal.
Birds may use similar methods to preserve fat levels during migration.
The scientists studied the plant Arabidopsis, which is regarded as a model plant for experiments.
'Astonished'
Overnight, when the plant cannot use energy from sunlight to convert carbon dioxide into sugars and starch, it must regulate its starch reserves to ensure they last until dawn.
Experiments by scientists at the John Innes Centre, Norwich, show that to adjust its starch consumption so precisely, the plant must be performing a mathematical calculation - arithmetic division.
Continue reading the main story
“Start Quote
This is the first concrete example in biology of such a sophisticated arithmetic calculation”
Prof Martin HowardJohn Innes Centre, Norwich
"They're actually doing maths in a simple, chemical way - that's amazing, it astonished us as scientists to see that," study leader Prof Alison Smith told BBC News.
"This is pre-GCSE maths they're doing, but they're doing maths."
The scientists used mathematical modelling to investigate how a division calculation can be carried out inside a plant.
During the night, mechanisms inside the leaf measure the size of the starch store. Information about time comes from an internal clock, similar to the human body clock.
'Sophisticated'
The researchers proposed that the process is mediated by the concentrations of two kinds of molecules called "S" for starch and "T" for time.
If the S molecules stimulate starch breakdown, while the T molecules prevent this from happening, then the rate of starch consumption is set by the ratio of S molecules to T molecules. In other words, S divided by T.
"This is the first concrete example in biology of such a sophisticated arithmetic calculation," said mathematical modeller Prof Martin Howard, of the John Innes Centre.
The scientists think similar mechanisms may operate in animals such as birds to control fat reserves during migration over long distances, or when they are deprived of food when incubating eggs.
Commenting on the research, Dr Richard Buggs of Queen Mary, University of London, said: "This is not evidence for plant intelligence. It simply suggests that plants have a mechanism designed to automatically regulate how fast they burn carbohydrates at night. Plants don't do maths voluntarily and with a purpose in mind like we do."
- wong chee tat :)
By Helen BriggsBBC News
Arabidopsis Arabidopsis thaliana: A model plant for scientific experiments
Plants have a built-in capacity to do maths, which helps them regulate food reserves at night, research suggests.
UK scientists say they were "amazed" to find an example of such a sophisticated arithmetic calculation in biology.
Mathematical models show that the amount of starch consumed overnight is calculated by division in a process involving leaf chemicals, a John Innes Centre team reports in e-Life journal.
Birds may use similar methods to preserve fat levels during migration.
The scientists studied the plant Arabidopsis, which is regarded as a model plant for experiments.
'Astonished'
Overnight, when the plant cannot use energy from sunlight to convert carbon dioxide into sugars and starch, it must regulate its starch reserves to ensure they last until dawn.
Experiments by scientists at the John Innes Centre, Norwich, show that to adjust its starch consumption so precisely, the plant must be performing a mathematical calculation - arithmetic division.
Continue reading the main story
“Start Quote
This is the first concrete example in biology of such a sophisticated arithmetic calculation”
Prof Martin HowardJohn Innes Centre, Norwich
"They're actually doing maths in a simple, chemical way - that's amazing, it astonished us as scientists to see that," study leader Prof Alison Smith told BBC News.
"This is pre-GCSE maths they're doing, but they're doing maths."
The scientists used mathematical modelling to investigate how a division calculation can be carried out inside a plant.
During the night, mechanisms inside the leaf measure the size of the starch store. Information about time comes from an internal clock, similar to the human body clock.
'Sophisticated'
The researchers proposed that the process is mediated by the concentrations of two kinds of molecules called "S" for starch and "T" for time.
If the S molecules stimulate starch breakdown, while the T molecules prevent this from happening, then the rate of starch consumption is set by the ratio of S molecules to T molecules. In other words, S divided by T.
"This is the first concrete example in biology of such a sophisticated arithmetic calculation," said mathematical modeller Prof Martin Howard, of the John Innes Centre.
The scientists think similar mechanisms may operate in animals such as birds to control fat reserves during migration over long distances, or when they are deprived of food when incubating eggs.
Commenting on the research, Dr Richard Buggs of Queen Mary, University of London, said: "This is not evidence for plant intelligence. It simply suggests that plants have a mechanism designed to automatically regulate how fast they burn carbohydrates at night. Plants don't do maths voluntarily and with a purpose in mind like we do."
- wong chee tat :)
Saturday, April 13, 2013
Thursday, February 25, 2010
Watching curvaceous women feels like drugs to men: study
Watching curvaceous women feels like drugs to men: study
February 25, 2010 by Lin Edwards hourglass
(PhysOrg.com) -- It has long been known that men find an "hourglass" figure the most attractive shape for the female body, and now scientists have found out why.
Research across a variety of cultures has demonstrated that men typically find the curvaceous female form sexually attractive. Other studies have shown that wide hips in women are associated with health and reproductive potential, so the attraction makes evolutionary sense.
Scientists from Georgia Gwinnett College in Lawrenceville, Georgia, studied the responses of 14 men with an average age of 25 to nude photographs of women before and after undergoing cosmetic surgery that redistributed fat from their waists to the buttocks to give them more of an hourglass figure. The operations did not reduce the weight of the women, but gave them an “optimal” Waist to Hip Ratio (WHR) of about 0.7.
The fMRI brain scans of the male subjects showed the post-surgery pictures activated the same regions of the brain that are activated by rewards, alcohol and drugs. Changes to women’s body mass index (BMI) did not affect the reward centers, but instead activated brain areas associated with the visual recognition of shape and size. This suggests judgments of female attractiveness based on body fat are based on society expectations rather than being hard-wired in the brain.
Steven Platek, an evolutionary cognitive neuroscientist, said the research may help explain why some men are addicted to pornography, and may also shed some light on other disorders “such as erectile dysfunction in the absence of pornography,” and add to our study of sexual infidelity. It also helps explain phenomena such as sexual harassment and whistling at curvaceous girls in the street. Platek said the BMI results suggest the female form projected by the media, of skinny waif-like models, is not the most attractive to men, and curves are worth their reproductive weight in gold.
The research paper, by Platek and Devendra Singh, presents the first description of the effect of WHR on men’s brains. It was published online in PLoS One on February 5.
More information: http://www.plosone.org/article/info:doi/10.1371/journal.pone.0009042
© 2010 PhysOrg.com
February 25, 2010 by Lin Edwards hourglass
(PhysOrg.com) -- It has long been known that men find an "hourglass" figure the most attractive shape for the female body, and now scientists have found out why.
Research across a variety of cultures has demonstrated that men typically find the curvaceous female form sexually attractive. Other studies have shown that wide hips in women are associated with health and reproductive potential, so the attraction makes evolutionary sense.
Scientists from Georgia Gwinnett College in Lawrenceville, Georgia, studied the responses of 14 men with an average age of 25 to nude photographs of women before and after undergoing cosmetic surgery that redistributed fat from their waists to the buttocks to give them more of an hourglass figure. The operations did not reduce the weight of the women, but gave them an “optimal” Waist to Hip Ratio (WHR) of about 0.7.
The fMRI brain scans of the male subjects showed the post-surgery pictures activated the same regions of the brain that are activated by rewards, alcohol and drugs. Changes to women’s body mass index (BMI) did not affect the reward centers, but instead activated brain areas associated with the visual recognition of shape and size. This suggests judgments of female attractiveness based on body fat are based on society expectations rather than being hard-wired in the brain.
Steven Platek, an evolutionary cognitive neuroscientist, said the research may help explain why some men are addicted to pornography, and may also shed some light on other disorders “such as erectile dysfunction in the absence of pornography,” and add to our study of sexual infidelity. It also helps explain phenomena such as sexual harassment and whistling at curvaceous girls in the street. Platek said the BMI results suggest the female form projected by the media, of skinny waif-like models, is not the most attractive to men, and curves are worth their reproductive weight in gold.
The research paper, by Platek and Devendra Singh, presents the first description of the effect of WHR on men’s brains. It was published online in PLoS One on February 5.
More information: http://www.plosone.org/article/info:doi/10.1371/journal.pone.0009042
© 2010 PhysOrg.com
Thursday, May 7, 2009
Project Updates / Status
Currently, I am reading and understanding this paper: Electric field distribution on knife-edge field emitters.
- wong chee tat :)
Wednesday, April 29, 2009
Project Updates... Stuck!
Currently, I am reading up one of the research papers that were given by Prof. While reading and coding in high level langauge, I came across this interestingly strange mathematical stuff named as: Incomplete elliptical integral of the second kind.
My first reaction: Oh God! What is that???? Not taught in my engine courses..... How?
Lets' turn to Google and see what does it showed up in the searches:
Elliptic integral
Elliptic Integral of the Second Kind (Complete)
Elliptic integrals of the first and second kind and Elliptic Integral Overview and a quick calculator is here (link).
Great! But how to code it?
- wong chee tat :)
Like this:
My first reaction: Oh God! What is that???? Not taught in my engine courses..... How?
Lets' turn to Google and see what does it showed up in the searches:
Elliptic integral
Elliptic Integral of the Second Kind (Complete)
Elliptic integrals of the first and second kind and Elliptic Integral Overview and a quick calculator is here (link).
Great! But how to code it?
- wong chee tat :)
Saturday, February 21, 2009
Project Updates
Just 6 or so weeks passed by! Right now should be week 7 and I had taken some quizzes.
As all you know, next week , there is a one week break! Yay! Good time and let me have a week break. But. but , but....During the 1 week break, there are some things that I need to do: project and assignments. The assignments are due right after the one week break! Oh no! Help!
In this blog post, I will try to give a short updates about my project. For this project that I have been working on, I spent quite a fair amount of time accessing the library database and finding and reading the journal articles that are related / may be related to my project. Some of them (articles ) may not seem related to my project at first, but they provide some framework for me to build on.
However, there are some journals that our library did not subscribed to them and so I am unable to read the whole article except for the abstracts. That's not too good as some of their research work are publish in some odd journals that are not so popular (at least to me. I might be wrong) and some of their works are in other languages other than English! (Russian.... ????? I'm didn't study Russian in my secondary! Hopefully Google translator can help :p )
More work still need to be done. At this point of time, what I can say is that Forbes and Lau and many others provide a good background for me to work on the amazing problems. I mentioned the two authors in this blog here because they have publish lots of articles. Well, if you know what I am working on, then I think that you'll be able to guess the names of the two authors and they are quite well known in their field.
Goodnight!
- wong chee tat :)
As all you know, next week , there is a one week break! Yay! Good time and let me have a week break. But. but , but....During the 1 week break, there are some things that I need to do: project and assignments. The assignments are due right after the one week break! Oh no! Help!
In this blog post, I will try to give a short updates about my project. For this project that I have been working on, I spent quite a fair amount of time accessing the library database and finding and reading the journal articles that are related / may be related to my project. Some of them (articles ) may not seem related to my project at first, but they provide some framework for me to build on.
However, there are some journals that our library did not subscribed to them and so I am unable to read the whole article except for the abstracts. That's not too good as some of their research work are publish in some odd journals that are not so popular (at least to me. I might be wrong) and some of their works are in other languages other than English! (Russian.... ????? I'm didn't study Russian in my secondary! Hopefully Google translator can help :p )
More work still need to be done. At this point of time, what I can say is that Forbes and Lau and many others provide a good background for me to work on the amazing problems. I mentioned the two authors in this blog here because they have publish lots of articles. Well, if you know what I am working on, then I think that you'll be able to guess the names of the two authors and they are quite well known in their field.
Goodnight!
- wong chee tat :)
Tuesday, October 14, 2008
Math Problem
Earlier today, one of my friends posted us a maths question. It is quite interesting as many of us can't solve the problem.
The question is: How do you solve for this:
Okay, how do you solve for it?
Do you use integration by parts? Is it possible to do it?
If not, what method do you applied?
One good way is to refer to the integral tables [here. Hint: 57 ]
You can refer to [wiki] for an introduction to integral tables or tables of integrals.
Do you get it? :D
- wong chee tat :)
The question is: How do you solve for this:
Okay, how do you solve for it?
Do you use integration by parts? Is it possible to do it?
If not, what method do you applied?
One good way is to refer to the integral tables [here. Hint: 57 ]
You can refer to [wiki] for an introduction to integral tables or tables of integrals.
Do you get it? :D
- wong chee tat :)
Sunday, September 7, 2008
Dijkstra's Algorithm
Whats' that?
You can refer to this: [wiki] , from [mathworld] and this handout [here].
In addition, an video link is [here too].
- wong chee tat :)
You can refer to this: [wiki] , from [mathworld] and this handout [here].
In addition, an video link is [here too].
- wong chee tat :)
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