Compressed Air Energy Storage, Entropy and Efficiency

The basic operating principle behind Compressed Air Energy Storage (CAES) is extremely simple. Energy is supplied to compress air, and when energy is required this compressed air is allowed to expand through some expansion turbines. But, as and when we approach this simple theory, it starts becoming more complex because of the thermodynamics involved. AirContinue reading “Compressed Air Energy Storage, Entropy and Efficiency”

Network File Transfer using Netcat

Netcat can be of great help in trasferring files across network, that too in a really scalable pipeline. For bear minimum usage of file transfer, only tar and netcat utilities are required. I tried different options and found the following superset pipeline. sender:$ tar cf – some_directory | gzip -9 | \ pv | gpgContinue reading “Network File Transfer using Netcat”

Nuclear vs. Renewables. A Carbon free competition

Before we start, let us do a small exercise. Just go back one decade, to around 2002. That was the time when people started noticing more about Global Warming and Climate Change. If someone considers about getting rid of fossil fuels at that time he or she had a very limited options which were costContinue reading “Nuclear vs. Renewables. A Carbon free competition”

Light Pollution: Can it be reduced

Astronomy is a wonderful field. From History it could be easily seen that Astronomy is the cradle of both Physics and Mathematics. Most of the early phisicists and mathematicians were astronomers too. All astronomical observations from prehistorical times to 1609 were exclusively using naked eye. Those early astronomers had no access to telescopes or camerasContinue reading “Light Pollution: Can it be reduced”

World Energy Consumption: A Cold war comparison

World Energy Consumption: 2250 Tsar Bombs or 18800 WW2 I like history. Recently I was reading about the 50th anniversary of Tsar Bomba, tested on 1961 October 30 by Soviet Union. Tsar Bomba is the single most powerful thermonuclear weapon ever used. It has a power of 50 to 57 megatons of TNT (210 PJ)Continue reading “World Energy Consumption: A Cold war comparison”

Mahatma Gandhi: A champion of sustainability through localization

Why we require localized food and energy production Yet another Gandhi Jayanti has come. In the wake of sustainability and issues like global warming, teachings of Mahatma Gandhi is becoming more and more important. Some of the Inspirational words of Mahatma Gandhi on Grama Swaraj (Village Self Governance), Sustainability etc. “The true India is toContinue reading “Mahatma Gandhi: A champion of sustainability through localization”

Lead Acid is the cheapest battery: *Conditions Apply

Lead Acid battery is touted as the cheapest battery available. In fact, Lead Acid is the family name for a collection of closely related battery types, from simple vented/flooded to advaned Valve Regulated ones. Depending upon the type of usage, there are shallow and deep cycle batteries. Typical examples of shallow cycle batteries are theContinue reading “Lead Acid is the cheapest battery: *Conditions Apply”

Analysing Specific Capacity and Energy Density of some popular batteries

In my last article, I was concentrating more about the Specific Capacity of different cathode materials. But this is only one part of the story when a complete cell is concerned. To find the Specific Capacity of a particular battery chemistry the whole chemical reaction has to be analyzed. Essentially the method used here isContinue reading “Analysing Specific Capacity and Energy Density of some popular batteries”

Specific Capacity of Cathode Materials

Recently I read some news about Lithium Ion batteries and the author mentioned that Lithium has the highest Specific Capacity of 3861mAh/g. I was very curious to know where this magic number came from. After trying to understand more about that, finally I found the answer. That was 12th class electrochemistry. The calculation is givenContinue reading “Specific Capacity of Cathode Materials”

Spoofing Multicast packet from another interface.

This is the scenario. I have a working ethernet device eth0 with an IP address 192.168.1.x. There is one more special interface in the system, say if1 which is connected to another network. That network is mainly used for transmitting multicast data. Received multicast data has to be processed by a userland application. Due toContinue reading “Spoofing Multicast packet from another interface.”