Those who appreciate giant structures, tanks, piping and large abandoned buildings, may like these photographs. The plants are closed, unused or in the process of being teared down. Buildings include sulfuric acid plants, steel furnaces and others.
For the Spanish version of this blog, click here
Saturday, July 25, 2009
Excellent laboratory website
Chemistry teaching websites are often of poor quality. That's not the case for Chemlab, the website of Darthmouth college's chemistry lab.
Laboratory procedures are clearly explained, as are some topics in chemistry. I highly recommend it to anybody teaching or concerned with the design of a chemistry teaching website.
For the Spanish version of this blog, click here
Laboratory procedures are clearly explained, as are some topics in chemistry. I highly recommend it to anybody teaching or concerned with the design of a chemistry teaching website.
For the Spanish version of this blog, click here
Origins of FORTRAN
I'd like to invite computer programming enthusiasts to view this video about the team that created the first version of the FORTRAN computer language. It's 12 minutes long and consists of interviews with the main protagonists of the story. The interviews reveal how excited they were of working on the (at the time) innovative project.
Even today, Fortran is one of the most widely used languages for numerical and scientific applications.
For the Spanish version of this blog, click here
Even today, Fortran is one of the most widely used languages for numerical and scientific applications.
For the Spanish version of this blog, click here
Heat engines without moving parts
Whenever something does not have moving parts, engineers get excited. Absence of moving parts means less parts that require lubrication, or can break down, and therefore the system has less maintenance.
Heat engines such as the internal combustion engine, compression refrigeration cycles or steam turbine cycles are widely used, but have great mechanical complexity and require many parts. Is it possible to make heat engines without turbines, pumps, pistons or hydraulic seals?
Yes, one such technology are the so called thermoacoustic engines. They use a compressible gas that vibrates inside a cavity at a resonance frequency. Invented long ago, the first models had poor efficiency, but recent advances achieved increases in efficiency that make them more attractive.
They can operate in direct mode, producing work from a temperature difference, or in reverse mode, as coolers that transfer heat from a cold reservoir to a hot one at the expense of work.
For the Spanish version of this blog, click here
Heat engines such as the internal combustion engine, compression refrigeration cycles or steam turbine cycles are widely used, but have great mechanical complexity and require many parts. Is it possible to make heat engines without turbines, pumps, pistons or hydraulic seals?
Yes, one such technology are the so called thermoacoustic engines. They use a compressible gas that vibrates inside a cavity at a resonance frequency. Invented long ago, the first models had poor efficiency, but recent advances achieved increases in efficiency that make them more attractive.
They can operate in direct mode, producing work from a temperature difference, or in reverse mode, as coolers that transfer heat from a cold reservoir to a hot one at the expense of work.
For the Spanish version of this blog, click here
List of good free math software
Below is a selection of high quality free math software. Many of them are distributed under a GNU license and work on multiple platforms (Linux, Windows, etc)
Maxima Algebra system with emphasis on symbolic computations.
Octave High level language, mostly oriented to numerical methods. It's fairly compatible with MATLAB. It was created for use in chemical engineering problem solving.
R Statistical and graphics package.It's similar to the "S" system developed at Bell labs (The main author of "S", is part of the development team of "R")
Scilab User friendly numerical package.
Gnuplot Very comprehensive scientific plotting program. Can be used from a command line or via scripts that allow automation of many tasks.
We found the links in GnuWin, a website dedicated to software of the GNU kind.
For the Spanish version of this blog, click here
Maxima Algebra system with emphasis on symbolic computations.
Octave High level language, mostly oriented to numerical methods. It's fairly compatible with MATLAB. It was created for use in chemical engineering problem solving.
R Statistical and graphics package.It's similar to the "S" system developed at Bell labs (The main author of "S", is part of the development team of "R")
Scilab User friendly numerical package.
Gnuplot Very comprehensive scientific plotting program. Can be used from a command line or via scripts that allow automation of many tasks.
We found the links in GnuWin, a website dedicated to software of the GNU kind.
For the Spanish version of this blog, click here
Composites for aircraft
Composite materials are a material of great interest for aircraft. According to Frost & Sullivan, as soon as the materials improve their cost-benefit ratio, they will replace parts currently made of aluminum alloys or steel in civilian and military aircraft.
One of the research trends is adding carbon nanotubes to composites. It is estimated that by 2020 nanotubes will be used widely in aircraft such as the Airbus A380 or Boeing 747.
For the Spanish version of this blog, click here
One of the research trends is adding carbon nanotubes to composites. It is estimated that by 2020 nanotubes will be used widely in aircraft such as the Airbus A380 or Boeing 747.
For the Spanish version of this blog, click here
Chemistry dissertations in spanish
Many PhD dissertations with chemistry related topics can be found online at universidad complutense de madrid. They describe procedures, research techniques, etc. Here's a link to another website with links to thesis.
For the Spanish version of this blog, click here
For the Spanish version of this blog, click here
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