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Messages - fahmidsadeque

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31
EEE / What is quantum tunneling?
« on: November 12, 2016, 11:50:58 PM »
Quantum-Tunneling is statistically possible passing of energetic walls, which would classically not be possible.
In QM Particles, whether Elementary or Compound, are described by a QM-wave-function ϕ(xμ) in complex Hilbert-space. The absolute squared wave-function ϕ⋅(xμ)ϕ(xμ) represents the possibility of detecting the particle at position xμ.
For example the Schrödinger-equations describes the wave-function. When a wave-function passes a region which it could classically never pass, the QM-wave-function always allows the possibility to pass this region with possibility > zero.
This is so-called quantum-tunneling
(collected)

32
Books / Re: Concepts of Modern Physics by Arthur Beiser
« on: July 08, 2015, 08:40:57 PM »
A very useful book

33
EEE / Biological Clocks
« on: June 18, 2015, 01:28:15 PM »
http://www.nutshell-videos.ed.ac.uk/andrew-millar-biological-clocks/
In this video Andrew describes how Systems Biology uses glowing plants to study the 24-hour clock, which drives daily and seasonal rhythms. Surprisingly, cells from humans to algae may have two biological clocks.
 
Background:

Professor Andrew Millar, Chair of Systems Biology in the School of Biological Sciences and associate director of SynthSys, combines molecular, physiological, and mathematical approaches in his research on the circadian clock in Arabidopsis thaliana.

Research:

The biological clock generates 24-hour rhythms that synchronise many biological processes with the environmental day/night cycles, from the human sleep-wake cycle to photosynthetic potential in plants. The circuit of interconnected genes in the clock mechanism governs both autonomous rhythms and responses to the environment: it has become one of the paradigms for understanding biological regulation in eukaryotes. Andrew’s laboratory uses experimental and theoretical approaches to understand the operating principles of biological networks, the mechanisms of the plant circadian clock and the physiological importance of daily and seasonal clocks for plant growth and crop yield.

The model plant Arabidopsis thaliana is the group’s main experimental system. Its biological clock is illustrated by the transgenic leaf, rhythmically glowing under our microscope (Wenden et al. Proc.Natl.Acad.Sci. USA, 2012). The plant carries a firefly luciferase gene that is controlled by its biological clock, so the glow from luciferase ‘reports’ the rhythmic activity of the related clock gene.

On the ROBuST project led by Karen Halliday, we are studying how the signalling network including the plant clock copes with changes in ambient temperature, and how this affects plant growth. The TiMet project aims to understand the bidirectional regulation between primary and secondary metabolism and the clock. The group is also developing data infrastructure to link experimental results to mathematical models. New modelling approaches are explored with several SynthSys collaborators, including stochastic models with Ramon Grima and Jane Hillston, Boolean models with Ozgur Akman and Peter Ghazal, and rule-based models with Vincent Danos. Current interests include a framework model to study particular biological regulation, such as the clock, in the context of a whole, growing plant: a prototype Digital Organism.

Work on the unicellular, marine alga Ostreococcus tauri (in the green images) was initiated with Francois-Yves Bouget and has grown to a major focus, with the discovery of a non-transcriptional clock (O’Neill et al. Nature, 2011) that might be shared from humans to archaea (Edgar et al. Nature, 2012). With John O’Neill and Akhilesh Reddy, we work on the unknown mechanisms of this oscillator. Thierry Le Bihan in the KPF has developed modern proteomics methods for the alga, and with Sinead Collins we are working on experimental evolution.

34
EEE / How Bat Sees
« on: June 18, 2015, 01:26:15 PM »
This stunning slow motion footage shows how bats use echolocation to find water. We know how bats echolocate to hunt insects, but this is the first study to show how they recognize large, flat objects like ponds. Moreover, by testing young bats that had never encountered a pond or river before, the researchers showed that bats seem to have a built-in ability to recognize these important features of their environment.
https://www.youtube.com/watch?v=gZxLUNHEmPw

36
Mangoes may very well be the king of all fruits. They fight cancer, alkalize the body, aid in weight loss, regulate diabetes, help digestion, clean your skin, and make the perfect snack. Here are 17 healthy reasons why you should be eating a mango every day.

Nutrition chart
One cup of mangoes (225 gms contain) contains the following percentages that apply to daily value.
105 calories
76 percent vitamin C (antioxidant and immune booster)
25 percent vitamin A (antioxidant and vision)
11 percent vitamin B6 plus other B vitamins (hormone production in brain and heart disease prevention)
9 percent healthy probiotic fibre
9 percent copper (copper is a co-factor for many vital enzymes plus production of red blood cells)
7 percent potassium (to balance out our high sodium intake)
4 percent magnesium

1. Fights cancer
Antioxidants like quercetin, isoquercitrin, astragalin, fisetin, gallic acid and methylgallat present in mango protect the body against colon, breast, leukemia and prostate cancers.

2. Keeps cholesterol in check
Mango has high level of vitamin C, pectin and fibres that help to lower serum cholesterol levels. Fresh mango is a rich source of potassium, which is an important component of cell and body fluids that helps to control heart rate and blood pressure.

3. Skin cleanser
Mangoes help you unclog your pores and add freshness to the face. Mangoes are applicable to any skin type. They help clear clogged pores that cause acne. Just slice a mango into thin pieces and keep them on your face for 10 to 15 minutes and then take bath or wash your face and see the results.

4. Alkalizes the body
According to natural health school.com, mango is rich in tartaric acid, malic acid and traces of citric acid that primarily help in maintaining the alkali reserve of the body.

5. Weight loss
Mango has a lot of vitamins and nutrients that help the body feel fuller. Also, the fibrous fruit boosts the digestive function of the body by burning additional calories, helping in weight loss.

6. Regulates diabetes
Not only the fruit but the leaves of mangoes are healthy too. For people suffering from diabetes, just boil 5-6 mango leaves in a vessel, soak it through night and drink the filtered decoction in the morning. This is helps in regulating your insulin levels.

Mango has a low glycemic index (41-60) so going a little overboard will not increase your sugar levels.

7. Aphrodisiac
Mango has aphrodisiac qualities and is also called the ‘love fruit’. Mangoes increase the virility in men. Vitamin E, which is abundantly present in mangoes, helps to regulate sex hormones and boosts sex drive.

8. Eye care
Did you know that mango is rich in vitamin A. One cup of sliced mangoes equals 25% intake of your daily need of vitamin A. Mangoes help in promoting good eye sight, fights dry eyes and also prevent night blindness.

9. Helps in digestion
Mango contains enzymes that help in breaking down protein. The fibrous nature of mango helps in digestion and elimination. It is is rich in pre-biotic dietary fibre, vitamins and minerals.

10. Heat stroke
When the sun is bogging you down this summer, just chop of a mango in a juicer; add a little water and a tbsp of sugar free or honey. This juice will instantly cool you down and prevent heat stroke.

11. Strengthens your immune
The deadly combination of vitamin C, vitamin A and 25 different kinds of carotenoids keep your immune system healthy.

12. Body scrub
Make a paste of mashed mango, honey and milk and use as a body scrub, you will feel that your skin is tender and smooth.

13. Aids concentration and memory
Studying for exams? This fruit is rich in glutamine acid– an important protein for concentration and memory. Feed mangoes to children who find it difficult to concentrate on studies.

14. High iron for women
Mango is rich in iron, hence it is a great natural solution for people suffering from anemia. Menopausal and pregnant women can indulge in mangoes as this will increase their iron levels and calcium at the same time.

15. Reduces Kidney Stones
In Chinese medicine, mangoes are considered sweet and sour with a cooling energy also capable of reducing the risk of kidney stone formation.

16. Perfect Snack
Instead of snacking on unhealthy chips and cookies, why not feast on slices of mangoes instead. They are perhaps one of the tastiest dehydrated fruits of all.

17. Stomach Tonic
Before going to bed put some 10 or 15 mango leaves in warm water and close it with lid. The next day morning filter the water and drink it in empty stomach. Do this regularly.

42
EEE / How an Induction Cooktop Works
« on: June 10, 2015, 09:57:01 PM »
An induction burner consists of a ceramic plate with an electromagnetic coil beneath it. When you turn on the burner, an electric current runs through the coil, generating a fluctuating magnetic field, but no heat on the burner itself.However, once you set an iron or stainless steel pan on the burner, the magnetic field induces many smaller electric currents in the pan's metal.

Iron is a poor conductor of electricity, so as all these small currents run through the iron, much of the energy is converted to heat. Thus, on an induction cooktop, the heat is coming not from the burner, but the pan itself.  This can make for more efficient cooking--a pot of water will come to a boil on an induction stove in almost half the time of a standard gas stove. You're also less likely to have hot spots in your pan, where food gets scorched because it has more contact with the heat source below. And, once you remove the pan, an induction cooktop cools off faster than a conventional burner, because it was only hot from contact with the pan.

The drawback is that only pans made from iron will work with induction stoves. Pans made of only copper or aluminum conduct electricity too well to generate significant heat. Cast-iron, stainless steel and pans made with layers of stainless steel all work. A rule of thumb-if a magnet will stick to it, you're good to go.

43
EEE / Photosynthesis
« on: May 28, 2015, 09:54:57 AM »
Learn the famous photosynthesis effect without which no one can survive.
https://www.youtube.com/watch?v=joZ1EsA5_NY

44
EEE / Piezo-electric Effect
« on: May 28, 2015, 09:53:05 AM »
To learn about piezo-electric effect click on this link
https://www.youtube.com/watch?v=_Sl3xej9WWw

45
EEE / Photo-Electric Effect
« on: May 28, 2015, 09:51:21 AM »
This video will explain photo electric effect clearly. Students are advised to watch it with attention.
https://www.youtube.com/watch?v=0qKrOF-gJZ4

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