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1. Eolic energy
Offers a brief though clear description of wind-based energy systems, with some helpful advices on how to build and install a residential turbine spending an extremely low amount of money.
2. Wolfram MathWorld: The Web's Most Extensive Mathematics Resource
Created, developed and nurtured by Eric Weisstein with contributions from the world's mathematical community, offers a complete, open-access encyclopaedia in the field of Mathematics. Indexed both alphabetically and by subject, each entry contains equations, animations, geometric pictures, historical data, cross-references and bibliographic notes. It covers all branches of Mathematics, from Classical Geometry to modern Cryptography, from recreational games and puzzles to an history of terminology. The pages deeply use the Mathematica® program for Symbolic Calculus.
3. BIPM - home page
Official page of the International Bureau for Weights and Measures located in Sèvres (FR), devoted to ensure world-wide uniformity of measurements and their traceability to the International System of Units (SI). Gives direct access to the official metrology journal (titled "Metrologia"), printable articles and open databases - including a dictionary of acronyms and a glossary of terms, a meetings schedule, a list of useful links and references, a series of updated reports on current scientific researches and all the official documents (Metre Convention, Fundamental Constants values, Consultative Commitees reports).
4. e-Print archive
Gives open access to e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics. Contains freely downloadable articles (mainly in pdf, LaTeX and PS formats), reports and emended versions of early materials submitted for approval to - and/or accepted by - certified journals. Its contents conform to Cornell University academic standards. The page is owned, operated and funded by Cornell University, a private not-for-profit educational institution.
5. Particle Data Group
Presents the most recent edition of the Review of Particle Physics, containing the data sheets collected by the Particle Data Group (an international collaboration charged with summarizing Particle Physics). Offers a complete list of elementary particles (leptons, hadrons, bosons, baryons, exotic matter, theoretical entities) and their notable properties (measured and/or expected values for mass, charge, hypercharge, quarkic composition, mean lives, prominent decay modes and channels). Charts, graphs and diagrams simplify the esposition of experimental results. Printable versions (pdf) of single chapters covering specific topics are available for downloading.
6. The Wolfram Functions Site
Created with Mathematica® (a computer program for symbolic calculus), developed and maintained by Wolfram Research, provides the mathematical and scientific community with a collection of formulas and graphics about mathematical functions. Each entry is filled with informations about local and global behaviour, history, complex representation, noteworthy theorems and special topics. Separate categories are dedicated to constants (e, pi, golden ratio, Euler-Mascheroni number, imaginary unit i), elementary functions (polynomials, trigonometric, exponential, logarithmic) and special functions (Gamma-type, Bessel-type, hypergeometric, elliptic, Riemann zeta-type).
7. National Nuclear Data Center
Offers a wide, complete and detailed range of information in the Nuclear Physics field, mantained and checked by the personnel at Brookhaven National Laboratory (USA). Presents both basic and advanced data (Atomic masses, nuclear reactions, fission and fusion parameters, cross sections, decay rates, dosimetry charts, resonances). Gives access to bibliographic databases, atlases, publications, reports.
8. Impossible world: Contents
Dedicated to impossible figures, i. e. figures, that can be drawn on paper, but can't be represented in real 3D-world. Presents artworks and technical drawings by Swedish artist Oscar Reutersvard and Dutch artist M.C. Escher, with various contribtions from other painters, sculptors and sketchers. Offers some computer programs to draw user-defined impossible objects.
9. TeX Users Group (TUG) home page
Founded and maintained by world-wide TeX and LaTeX users, collects informations and solutions about D. E. Knuth's mark-up language and its macro extentions. Gives the visitor both simple, basic introductions and detailed programming instructions, a packages indexed list (alphabetical and by topic), the various distributions (for Windows, Mac or Linux); coordinates the activities from local and national user groups and publishes some technical journals and periodic notes. Membership available at request.
10. The Assayer
Presents an indexed collection of books, documents and written material available for free: technical manuals, novels, scientific textbooks, History essays.
11. The Online Books Page
Presents an indexed, growing collection of online books and notes available for free; many subjects involved, included rare books, children's books, and old popular fiction; scientific monographies and textbooks are also available.
12. NASA Science
Offers a wide range of informations concerning Earth and Space Science: photos from near and outer space, detailed descriptions of planet and minor celestial bodies, deep accounts on Sun and heliophysics, astrophysical data and evidences, Earth composition, development and atmosphere. Maintained and updated by the American National Aeronautics and Space Administration (NASA).
13. Contents, Interactive Mathematics Miscellany and Puzzles
An encyclopedic collection of math games, problems, puzzles, and articles. A lot of math information for teachers, students and parents. Work out and enjoy mathematics. Explore unexpected connections. Even Word Problem Tutorials
14. Two dimensional curves
Jan Wassenaar's collection of special plane curves, listed as algebraic (polynomials), transcendental (trochoids, cycloids, spirals, trigonometric, exponential) and derived (pedal, tractrix, barycentric, evolute, involute, inverse et al.); each entry has its own page with defining equations, noticeable properties, historical data.
15. Full Alphabetical Index
A vast and comprehensive list of mathematical biographies maintained by St. Andrews University (Scotland). Indexed alphabetically, from Early Antiquity to Contemporary Age. Each entry has a short version and a long, more detailed version.
Offers resources and informations about the International Union of Pure and Applied Chemistry (IUPAC), which serves to advance the worldwide aspects of the chemical sciences and to contribute to the application of chemistry in the service of Mankind. Presents a selection of recent publications, current projects, scheduled conferences and the members' list.
17. IUPAP: Home
Official online space for the International Union of Pure and Applied Physics (IUPAP), whose aims are: to stimulate and promote international cooperation in physics; to sponsor suitable international meetings and to assist organizing committees; to foster the preparation and the publication of abstracts of papers and tables of physical constants; to promote international agreements on other use of symbols, units, nomenclature and standards; to foster free circulation of scientists; to encourage research and education.
18. IEEE - the world's leading professional association for the advancement of technology
Presents informations about the once named Institute of Electrical and Electronics Engineers; the IEEE fosters innovation through publications, conferences, standards development, and member collaboration. Provides electronic library, online learning programs, a list of scheduled conventions and seminars, publication history. Membership available at request.
Provides informations, news and contacts of the United Nations Educational, Scientific and Cultural Organization: offers news, documentation, a calendar of incoming events, legal instruments, job opportunities, lists of member States and ongoing campaigns.
20. MathPages
Presents a collection of essays, articles and notes on Mathematics and Physics, indexed by topic. Deeper insights are available on Relativity, Music, History of Mathematics and famous quotations.
21. The Robot Hall of Fame
Honors the fictional and real automata that have inspired and made breakthrough accomplishments in robotics. Created by Carnegie Mellon University in April 2003 to call attention to the increasing contributions from robots to human society, each year, selects real and fictional robots for recognition and induction into the Hall.
22. Living Reviews in Relativity
Presents fully-available articles in the fields of Relativity, indexed and collected in yearly volumes: provides results, ideas, proposals and mathematical calculations in Special, General, Cosmological and Quantum Relativity.
23. H-index
This plugin allows the citation index of all the scientists on Google Scolar
24. H Index
Contains information and useful resources on the H index

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