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In 2006, a fibre-reinforced composite pool panel was introduced for in-ground swimming pools, residential as well as commercial, as a non-corrosive alternative to galvanized steel.

In 2007, an all-composite military Humvee was introduced by TPI Composites Inc and Armor Holdings Inc, the first all-composite military vehicle . By using composites the vehicle is lighter, allowing higher payloads. In 2008, carbon fibre and DuPont Kevlar (five times stronger than steel) were combined with enhanced thermoset resins to make military transit cases by ECS Composites creating 30-percent lighter cases with high strength.

Pipes and fittings for various purpose like transportation of potable water, fire-fighting, irrigation, seawater, desalinated water, chemical and industrial waste, and sewage are now manufactured in glass reinforced plastics.

Carbon fibre composite part.

Composites are made up of individual materials referred to as constituent materials. There are two main categories of constituent materials: matrix ( binder ) and reinforcement . At least one portion of each type is required. The matrix material surrounds and supports the reinforcement materials by maintaining their relative positions. The reinforcements impart their special mechanical and physical properties to enhance the matrix properties. A synergism produces material properties unavailable from the individual constituent materials, while the wide variety of matrix and strengthening materials allows the designer of the product or structure to choose an optimum combination.

Engineered composite materials must be formed to shape. The matrix material can be introduced to the reinforcement before or after the reinforcement material is placed into the mould cavity or onto the mould surface. The matrix material experiences a melding event, after which the part shape is essentially set. Depending upon the nature of the matrix material, this melding event can occur in various ways such as chemical polymerization for a Raye X House Of Harlow 1960 Sommers Heel zpZDbA5qH
, or solidification from the melted state for a thermoplastic polymer matrix composite.

A variety of moulding methods can be used according to the end-item design requirements. The principal factors impacting the methodology are the natures of the chosen matrix and reinforcement materials. Another important factor is the gross quantity of material to be produced. Large quantities can be used to justify high capital expenditures for rapid and automated manufacturing technology. Small production quantities are accommodated with lower capital expenditures but higher labour and tooling costs at a correspondingly slower rate.

Many commercially produced composites use a polymer matrix material often called a resin solution. There are many different polymers available depending upon the starting raw ingredients. There are several broad categories, each with numerous variations. The most common are known as polyester , vinyl ester , epoxy , phenolic , Dr Martens 1460 UNKNOWN Laceup boots black smooth 44CGFcjK7
, polyamide , polypropylene , , and others. The reinforcement materials are often fibres but also commonly ground minerals. The various methods described below have been developed to reduce the resin content of the final product, or the fibre content is increased. As a rule of thumb, lay up results in a product containing 60% resin and 40% fibre, whereas vacuum infusion gives a final product with 40% resin and 60% fibre content. The strength of the product is greatly dependent on this ratio.

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A definitive new study dispels the myth of the Silicon Valley wunderkind.

Based on the research of Pierre Azoulay, Benjamin F. Jones , J. Daniel Kim and Javier Miranda

Michael Meier

Silicon Valley’s tech workers can go to great lengths to appear youthful—from having plastic surgery and hair transplants, to lurking in the parking lots of hip tech companies to see how the young and promising dress, Converse Chuck Taylor All Star Big Eyelets Ox Egret/ Vintage Khaki/ White JJNV1
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While this may seem extreme, there is clearly a bias among many in the tech sector toward the young. Take Mark Zuckerberg’s statement that “ Missguided Croc Multi Strap Block Heel Sandal fFByjdYm2
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that PayPal cofounder Peter Thiel hands out each year to bright entrepreneurs—provided that they are under 23.

“There’s this idea that young people are just more likely to have more valuable ideas,” says Benjamin Jones , a professor of strategy at the Kellogg School.

But is this notion accurate?

“If you look at age and great achievement in the sciences in general, it doesn’t peak in the twenties,” he says. “It’s more middle-aged.” Even Nobel Prize winners are having their breakthrough successes later and later in life, Jones found in earlier research . Are the startups of Silicon Valley really an exception?

In a new study, Jones, along with Javier Miranda of the U.S. Census Bureau and MIT's Pierre Azoulay and J. Daniel Kim , use an expansive dataset to tackle that question. The researchers find that, contrary to popular thinking, the best entrepreneurs tend to be middle-aged. Among the very fastest-growing new tech companies, the average founder was 45 at the time of founding. Furthermore, a given 50-year-old entrepreneur is nearly twice as likely to have a runaway success as a 30-year-old.

Scientists who make breakthroughs are older than ever

A QA on why you should “date before you marry” with an entrepreneur who took the plunge.

Advice from Kellogg faculty experts on starting and running your own business.

These findings have serious implications—not only for aspiring entrepreneurs, who might be over- or underestimating their odds of success based on their age, but for society at large. After all, if venture capitalists are reluctant to bet on older entrepreneurs, then many potentially successful startups may never get off the ground.

“If we’re not allocating dollars to the right people in entrepreneurship, we may be losing, in terms of the advances that best raise socioeconomic prosperity,” Jones says. “It’s actually a fairly high-stakes question.”

To use the routines in your own C or C++ programs using MinGW-w64, include

and link against ‘ -lRmath ’. This will use the first found of libRmath.dll.a , libRmath.a and Rmath.dll in that order, so the result depends on which files are present. You should be able to force static or dynamic linking via

or by linking to explicit files (as in the ‘ test ’ target in Makefile.win : this makes two executables, test.exe which is dynamically linked, and test-static.exe , which is statically linked).

It is possible to link to Rmath.dll using other compilers, either directly or via an import library: if you make a MinGW-w64 import library as above, you will create a file Rmath.def which can be used (possibly after editing) to create an import library for other systems such as Visual C++.

If you make use of dynamic linking you should use

to ensure that the constants like NA_REAL are linked correctly. (Auto-import will probably work with MinGW-w64, but it is better to be sure. This is likely to also work with VC++, Borland and similar compilers.)

Next: Configuration on a Unix-alike , Previous: The standalone Rmath library , Up: HENDERSON BARACCO Sabates lace KZzQNeSRZ
[ Contents ][ Index ]

This appendix gives details of programs you will need to build R on Unix-like platforms, or which will be used by R if found by configure .

Remember that some package management systems (such as and Debian/Ubuntu’s) make a distinction between the user version of a package and the development version. The latter usually has the same name but with the extension ‘ -devel ’ or ‘ -dev ’: you need both versions installed.

Next: Useful libraries and programs , Previous: Essential and useful other programs under a Unix-alike , Up: Essential and useful other programs under a Unix-alike [ Contents ][ Index ]

You need a means of compiling C and FORTRAN 90 (see Using FORTRAN ). Your C compiler should be /60059 UGG Womens Kristin Classic Slim Leather Sheepskin Boots Stout UK 35 QnSAv7FRkT
, POSIX 1003.1 and C99-compliant. 39 R tries to choose suitable flags Nike Air Max 180 / Pink BlastWolf Grey ym7e1kW
for the C compilers it knows about, but you may have to set CC or CFLAGS suitably. For versions of gcc prior to 5.1 with glibc this means including -std=gnu99 41 . (Note that options essential to run the compiler even for linking, such as those to set the architecture, should be specified as part of CC rather than in CFLAGS .)

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