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HOW TO PROVE THAT A NAND GATE IS A UNIVERSAL GATE??

NAND GATE and NOR GATE can be used as universal gates because all the basic logic gates can be realized using NAND or NOR alone as detailed below.

Realization of Basic logic Gates using NAND

Realization of Basic logic Gates using NAND

 

Realization of Basic logic Gates using NOR

Realization of Basic Logic Gates using NOR gate

 

Read more at http://www.ccse.kfupm.edu.sa/~amin/eCOE200/Lesson2_6.pdf

Engineers make loud sound to bend light on a computer chip

University of Minnesota engineering researchers have developed a chip on which both sound wave and light wave are generated and confined together so that the sound can very efficiently control the light.

http://gty.im/478989263

The research was recently published in Nature Communications.

“Our breakthrough is to integrate optical circuits in the same layer of material with acoustic devices in order to attain extreme strong interaction between light and sound waves,” said Mo Li, assistant professor in the Department of Electrical and Computer Engineering and the lead researcher of the study.

Read more at: http://phys.org/news/2014-11-loud-chip.html#jCp

A Face Book conversation on relativity and its effects

Relativity has fascinated many young minds (old too).

http://gty.im/iwdayala0103c

Below is a conversation between a student and a Physics Teacher on Facebook chat.

 

hlo sir,
HELLO

did u watch interstellar movie??
no

kk… i hv a doubt regarding g concept??

(more…)

New light to illuminate the world – the inventors of LED gets Nobel Prize 2014

According to the official press release,
The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics for 2014 to

Isamu Akasaki

image

Meijo University, Nagoya, Japan and Nagoya University, Japan

Hiroshi Amano
Nagoya University, Japan

and

Shuji Nakamura
University of California, Santa Barbara, CA, USA

“for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources”

(more…)

Numericals from Newton’s Laws of motion based on F=ma (For calss XI students of Kendriya Vidyalaya Pattom)

Download the questions and solve them and submit on or before 9 Oct 2014

  1. A force acts for 10 s on a body of mass 10 kg after which the force ceases and the body describes 50 m in the next 5 s. Find the magnitude of the force. [Ans: 10 N]
  2. A  truck starts from rest and rolls down a hill with constant acceleration. It travels a distance od 400 m in 20s. Calculate the acceleration and the force acting on it if its mass is 7 metric tonnes. [Ans: 2 m/s2, 14000N]
  3. A motor car running aat the rate of 7 m/s can be stopped by applying brakes in 10 m. Show that total resistance to the motion, when the brakes are on is one fourth of the weight of the car.
  4. In an Xray machine, an electron is subjected top a force of 10-23 N. In how much time the electron will cover a distance of 0.1 m,? Take the mass of the electron = 10-30 kg

Numericals from Newton’s Laws of motion based on F=ma (For calss XI students of Kendriya Vidyalaya Pattom)

Download the questions and solve them and submit on or before 9 Oct 2014

  1. A force acts for 10 s on a body of mass 10 kg after which the force ceases and the body describes 50 m in the next 5 s. Find the magnitude of the force. [Ans: 10 N]
  2. A  truck starts from rest and rolls down a hill with constant acceleration. It travels a distance od 400 m in 20s. Calculate the acceleration and the force acting on it if its mass is 7 metric tonnes. [Ans: 2 m/s2, 14000N]
  3. A motor car running aat the rate of 7 m/s can be stopped by applying brakes in 10 m. Show that total resistance to the motion, when the brakes are on is one fourth of the weight of the car.
  4. In an Xray machine, an electron is subjected top a force of 10-23 N. In how much time the electron will cover a distance of 0.1 m,? Take the mass of the electron = 10-30 kg

How Stephen Hawking lived so long with ALS?

It is normally observed that a person with ALS (Amyotropic Lateral Sclerosis) succumbs to death within five years. Stephen Hawking‘s condition was first diagnosed when he was 21, and he was not expected to see his 25th birthday. But how he managed to “actively” to his 72 years of age? This is a matter to be discussed.

What is ALS?

ALS stands for Amyotropic Lateral Sclerosis and is a motor neuron disease. Also known as as Lou Gehrig’s disease after an American baseball first baseman who played 17 seasons in Major League Baseball (MLB) for the New York Yankees (1923–1939);  and in 1995 Gehrig’s streak ended in 1939 after he was diagnosed with amyotrophic lateral sclerosis (ALS) which forced him to retire at age 36 and claimed his life two years later.

ALS is a neuro degenerative disease.

What causes ALS?

Structure of target enzyme

The exact cause of LAS is not known. 5% to 10% caused by a defective gene that prevents the body from producing a normal amount of an enzyme called superoxide dismutase. This enzyme helps neutralize free radicals — highly reactive oxygen molecules produced during metabolism and capable of damaging body tissues. Researchers speculate that defects in protective enzymes may also account for non-inherited ALS and that environmental toxins may be a factor.

Some evidence suggests that the disease may be triggered by exposure to heavy metals, animal hides, or fertilizers, although this is by no means proven. In addition, viral infection and severe physical trauma have been implicated as possible contributors. Other theories link ALS to a phenomenon called excitotoxicity, in which the nerve cells that control movement are overstimulated by a neurotransmitter called glutamate to the point where they eventually die.

How ALS kills?

Life expectancy turns on two things: the motor neurons running the diaphragm—the breathing muscles. So the common way people die is of respiratory failure. And the other thing is the deterioration of swallowing muscles, and that can lead to malnutrition and dehydration.

Stephen Hawking

Stephen Hawking was predicted to leave this world at the age of 25, but now he is going to be 72! What made him live so long (Thank God!)?

Many account the round the clock medical care and the sophisticated environment to be responsible for his longevity.

But, the biological setup, the will power, the affirmation of self to go on to better heights despite the problems ….

What do you think?

Read More …

What is amyotrophic lateral sclerosis?
Who gets ALS?
What are the symptoms?
How is ALS diagnosed?
What causes ALS?
How is ALS treated?
What research is being done?
How Can I Help Research?
Where can I get more information?

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