Xem 1-13 trên 13 kết quả Structural tubing
  • The American Institute of Steel Construction, founded in 1921, is the non-profit technical specifying and trade organization for the fabricated structural steel industry in the United States. Executive and engineering headquarters of AISC are maintained in Chicago, Illinois.

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  • American Welding Society Vice President Jerry Uttrachi is a master welder and he reveals all major welding processes and techniques, so you can repair and fabricate using advanced materials and complete complex projects. TIG, MIG, oxy-acetylene, and stick welding techniques are illustrated for a wide range of automotive applications. Uttrachi details how to make a butt joint, single pass butt, double pass butt, joggle joint, lap joint welds, and numerous other varieties of joint welds.

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  • Carbon nanotubes were identified for the first time in 1991 by Sumio Iijima at the NEC Research Laboratory, using high resolution transmission electron microscopy, while studying the soot made from by-products obtained during the synthesis of fullerenes by the electric arc discharge method. In this soot, Iijima clearly observed the so-called multiwalled nanotubes, molecular carbon tubes with diameters in the nanometer range, consisting of carbon atoms arranged in a seamless graphitic structure rolled up to form concentric cylinders.

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  • The significance of flow cytometry can be summarized as the measure (-metry) of the optical properties of cells (cyto-) transported by a liquid sheath (flow) to a light source excitation (most often a laser) (Shapiro, 2003). FCM facilitates single cell analyses of both cell suspension, such as eukariotic and prokariotic cells, and “non cellular” suspension, such as microbeads, nuclei, mitochondria and chromosomes.

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  • Uttrachi details how to make a butt joint, single pass butt, double pass butt, joggle joint, lap joint welds, and numerous other varieties of joint welds. Using the techniques revealed in this book, you can fabricate body panels, frames, and any number of structural and functional automotive components, and perform structural repair

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  • The nano-scale spatial organization of metallic and other inorganic materi-als into 1D objects is a key task in nanotechnology. Nano-scale fibers and tubes are very useful templates for such organization because of their inherent 1D organization. Fibrillar biological molecules and biomolecular assemblies are excellent physical supports on which to organize the inor-ganic material.

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  • Carbon Nanotubes and Nanodevices Carbon nanotubes, discovered in 1991, are molecular structures which consist of graphene cylinders closed at either end with caps containing pentagonal rings. Carbon nanotubes are produced by vaporizing carbon graphite with an electric arc under an inert atmosphere. The carbon molecules organize a perfect network of hexagonal graphite rolled up onto itself to form a hollow tube. Buckytubes are extremely strong and flexible and can be single- or multi-walled.

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  • Equilibrium Chemistry 186 6. Multilayer Structures 6 Multilayer Structures Fig. 6.1.1 Multilayer dielectric slab structure. Higher-order transfer functions of the type of Eq. (5.7.2) can achieve broader reflectionless notches and are used in the design of thin-film antireflection coatings, dielectric mirrors, and optical interference filters [615–677,737–770], and in the design of broadband terminations of transmission lines [805–815].

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  • DOA Estimation Fundamentals 186 6. Multilayer Structures 6 Multilayer Structures Fig. 6.1.1 Multilayer dielectric slab structure. Higher-order transfer functions of the type of Eq. (5.7.2) can achieve broader reflectionless notches and are used in the design of thin-film antireflection coatings, dielectric mirrors, and optical interference filters [615–677,737–770], and in the design of broadband terminations of transmission lines [805–815].

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  • Low-density parity-check (LDPC) codes are forward error-correction codes, first proposed in the 1962 PhD thesis of Gallager at MIT. At the time, their incredible potential remained undiscovered due to the computational demands of simulation in an era when vacumm tubes were only just being replaced by the first transistors. They remained largely neglected for over 35 years. In the mean time the field of forward error correction was dominated by highly structured algebraic block and convolutional codes.

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  • There are several differences between bamboo and wood. In bamboo, there are no rays or knots, which give bamboo a far more evenly distributed stresses throughout its length. Bamboo is a hollow tube, sometimes with thin walls, and consequently it is more difficult to join bamboo than pieces of wood. Bamboo does not contain the same chemical extractives as wood, and can therefore be glued very well [Jassen 1995].

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  • The male reproductive system is adapted for internal fertilization. The penis is a structure that has evolved to deposit sperm safely within the female’s body. The tube that passes through the penis, the urethra, has two functions. It is the pathway for sperm out of the body as well as the pathway for urine to leave the body after having been stored in the uri- nary bladder. At the time of sexual excitement, a valve closes. This valve prevents the bladder from releasing urine. At the same time, nerve impulses from the brain cause blood vessels in the penis to relax.

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  • This development of egg cells occurs within the ovary once a month. One mature egg cell is released from one of the ovaries. The ovaries con- tain follicles. A follicle is a hollow bundle of cells with an egg inside. The follicle helps the egg mature. As the egg matures, the follicle enlarges and fills with fluid. The greatly enlarged follicle moves to the edge of the ovary and bursts, releasing the egg and the fluid. This event is ovulation, the release of an egg from the ovary. (See Figure 17-4.

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