A very bad day!

Today was a very bad day. And by today I mean the real scientific today(haha!). I went to bed at 1:00 pm but was not able to sleep. All thanks to my fellow roommates. One of my roommate along with one of our hostel-mate played some stupid game on the latter's laptop till 8 am in the morning. In my cycles of sleep, I could hardly sleep. Just as the deep phase of my sleep was getting over, I was getting woken up by these two idiots' laughter and howling. Every time my sleep broke I was bursting with anger but I didn't say anything to those morons. Right now am feeling like chewing them up. Instead of shouting on them I am hitting my laptop keys. And in anger I have decided to start blogging. This is my first blog and am writing my disappointments of the day in it. Great fool I am.

Today I had my first semester ICP lab exam 1 which was the good thing of the day as it went quite good. My scores aren't relevant here I guess! But they are quite good. After returning from the exam at 2:30 pm, I found my room locked with a different lock. I asked the warden if my roommate had given him the key to keep, as he does whenever he doesn't use the common lock. I searched the reception, but no, the dumbo had forgotten to keep the key with the warden. I felt like hitting my head on the wall. Then when my anger resided a little, I went to the E-library of the college. There I waited till his exam got over. During that time I downloaded The Mummy(1999). And did some miscellaneous surfing and Facebook. Finally now am in my room, still in frustration and agony. I should kill my fellow roommates.

Oh, I should tell you that I have three roommates, one of them is simple. The other two are the bad ones. They aren't just bad, they are worst. The one who didn't let me sleep is Abhishek and the one who kept me waiting for key is Sitansu.

Rest of the story, some other day.
Spit the anger! :-D

11/25/2014 07:27:00 pm Share:

Checking my blog

Checking how it looks after posting a blog.

So here its a sample article.

Devices in which a controlled flow of electrons can be obtained are the basic building blocks of all the electronic circuits. Before the discovery of transistor in 1948, such devices were mostly vacuum tubes (also called valves) like the vacuum diode which has two electrodes, viz., anode (often called plate) and cathode; triode which has three electrodes – cathode, plate and grid; tetrode and pentode (respectively with 4 and 5 electrodes).

In a vacuum tube, the electrons are supplied by a heated cathode and the controlled flow of these electrons in vacuum is obtained by varying the voltage between its different electrodes. Vacuum is required in the

inter-electrode space; otherwise the moving electrons may lose their energy on collision with the air molecules in their path. In these devices the electrons can flow only from the cathode to the anode (i.e., only in one direction). Therefore, such devices are generally referred to as valves. These vacuum tube devices are bulky, consume high power, operate generally at high voltages (~100 V) and have limited life and low reliability.

The seed of the development of modern solid-state semiconductor electronics goes back to 1930’s when it was realised that some solid state semiconductors and their junctions offer the possibility of controlling the number and the direction of flow of charge carriers through them. Simple excitations like light, heat or small applied voltage can change the number of mobile charges in a semiconductor. Note that the supply and flow of charge carriers in the semiconductor devices are within the solid itself, while in the earlier vacuum tubes/valves, the mobile electrons were obtained from a heated cathode and they were made to flow in an

evacuated space or vacuum. No external heating or large evacuated space is required by the semiconductor devices. They are small in size, consume low power, operate at low voltages and have long life and high reliability.

Even the Cathode Ray Tubes (CRT) used in television and computer monitors which work on the principle of vacuum tubes are being replaced by Liquid Crystal Display (LCD) monitors with supporting solid state

electronics. Much before the full implications of the semiconductor devices was formally understood, a naturally occurring crystal of galena (Lead sulphide, PbS) with a metal point contact attached to it was used as detector of radio waves.

2/26/2014 04:13:00 am Share: