Norooz Gift to all Friends,
March 18, 2009
July 23, 2008
How to Google Effectively?
Google is the best search engine ever. Every time you search for a specific word in Google, it searches its tremendous database with more than 20 billion (and always growing) web pages indexed. Although Google use very efficient algorithm for ranking its results, following tips are always can be useful for finding the best results:
- Do a file specific search by using {/filetype:} keyword. For example if you want to file a presentation about pressure vessel you can use {Pressure Vessel /filetype:ppt} as a possibly good keywords.
- Use non-relevant document related words: It is not always necessary to use words relevant to your idea. sometimes you should use some words that are document specific. For example if you are looking for a paper regarding “pressure vessels” you can use {Abstract References} as well as {Pressure Vessel} to narrow your search.
- If you want to find ebooks and other materials that may be shared by someone on public file hostings your can add {(Rapidshare OR filefactory OR 4shared OR megaupload OR depositfiles OR mihd OR easyshare)} to your search keywords. Any other file hosting names can be added to the above list with OR keyword.
- If you want to find a specific book, first search for the book in Amazon.com or in Books.google.com and find ISBN number of the book. Then google for the ISBN number with the keywords presented in item 3.
- Use {/site:} keyword to search specific sites. For example if you want to find to something in Australian universities add {/site:edu.au}to your site.
- Don’t limit yourself to the first page of the results. I always find my best results even in 20th or 30th pages.
- Narrow the results by using phrases. For Example using {“Pressure Vessels” } as keyword is always better than {Pressure Vessels}
- Google always searches for other combinations of the words. You can omit it by using quotation for a single word.
- If you cannot memorize all google keywords, simply use Google Advance Search.
- Always try other search engines. Sometimes you may find something valuable.
PS: Remove {} from all keywords.
July 21, 2008
How many crude oil barrel are needed to buy US?
United States of America , with a wide gap with other countries, is the biggest world economy and contains the richest nation in the world. Gross Domestic Product (GDP) of US is approximately equal to sum of GDPs of Germany, UK, France, Italy, Canada, and Russia.
Every three month US Federal Reserve evaluates net wealth of three hundred thousands people living in United States. In this evaluation Federal Reserve sum ups all peoples assets and deducts all liabilities. The remaining is the total wealth of Americans. Results of this evaluation is reported in “Flow of Funds” report.
Jun 2008 version of this report shows that net wealth of Americans is 56 trillion US$, 1.7 trillion US$ less than the preceding . To convert this wealth to oil barrel, it can be divided by 135 US$, which is average price of a oil barrel nowadays. The result will be 410 billion barrels. So, the total wealth of Americans is about 410 billion barrels of crude oil. At the first look it seems too much but this is just oil reserves of two middle east countries, Iran and Saudi Arabia. Latest investigations shows that total oil reserves of Iran and Saudi Arabia are about 136 and 264 billion barrels, respectively.
In 1970, according to “Flow of Funds” report of that year, net wealth of Americans was 4.3 trillion US$. Considering oil price of 18.1 US$/barrel, 1.1 trillion oil barrel was needed to buy all American wealths at that period of time. That mean all available oil reserves at that moment was not sufficient for buying all Americans wealth. So, during the last 38 years, and specially after 2000 when George W Bush became the president of unities states, peoples in Iran and Saudi Arabia became much more wealthier than Americans. Following figures shows changes in American wealth based on number of crude oil barrels.
P.S: This article is a free translation of this article, which has been presented in www.shahirblog.com