Radial thread

MA Dragline radial threads MASp 1 and 2 ( ) (GA) /(A) / -structure GPGGX/GPGQQ /Lspiral GGX 3j helix =2-8 Gly (38), Ala (29), SSC (70), PC (21) Low concentration disorder/PPII High concentration helical/molten globule 0-Sheet 15-30 35... 

The different spinning glands in the spider s abdomen produce different kinds of silks, such as draglines, frame threads, mooring radial threads, spiral threads, sticky material, egg cocoon, swathing bands and attachment discs. 

A typical web spider secretes different threads such as frame threads, mooring threads, radial threads, spiral threads and a hub for constructing orb-web. They also secrete threads such as attachment discs and draglines, as shown in Fig. 4.39. The radial threads converge in a central spot called the hub, which consists of... 

Fig. 4.39 Schematic view of a spider s orb-web. 1 frame thread, 2 mooring thread, 3 radial thread, 4 spiral thread, 5 hub, 6 attachment disc, 7 dragline.

One aspect of pressure vessel design which has received considerable attention in recent years is the design of threaded closures where, due to the high stress concentration at the root of the first active thread, a fatigue crack may quickly initiate and propagate in the radial—circumferential plane. Stress intensity factors for this type of crack are difficult to compute (112,113), and more geometries need to be examined before the factors can be used with confidence. 

The hydraulieally tensioned, radial-fit bolt (Figure 6-32) replaees the traditional turbine shaft eoupling bolt and is reusable. The main body of the bolt is threaded at eaeh end and has a slight taper on the eenter seetion, whieh engages with the similarly internally tapered sleeve and the two nuts. The bolt is taper-bored at eaeh end to aeeept the puller that is part of the hydraulie tensioning system. 

The shared memory OpenMP library is used for parallelization within each node. The evaluation of the action of potential energy, rotational kinetic energy, and T2 kinetic energy are local to each node. These local calculations are performed with the help of a task farm. Each thread dynamically obtains a triple (/2, il, ir) of radial indices and performs evaluation of first the kinetic energy and then the potential energy contribution to hps local( , i2, il, ir) for all rotational indices. 

Voids often look similar to air bubbles. The appearance of voids in filaments or films, however, results for different reasons. Voids can be produced during stretching in the area of necking by a kind of folding mechanism. The formation of voids may also depend on the generation of a radial gradient structure during solidification of the threads. 

For shafts that require sleeve gaskets to pass over threads, at least 1.5 mm (0.06 in.) radial clearance shall be provided between the threads and the internal diameter of the gasket, and the diameter transition shall be chamfered in accordance with 2.2.10. 

Renewable wear rings shall be held in place by a press fit with locking pins or threaded dowels (axial or radial) or by flanged and screwed methods. Other methods, inclnd-ing tack welding, require the purchaser s approval. The diameter of a hole in a wear ring for a radial pin or threaded dowel shaU not be more than one third the width of the wear ring. 

For many years, filament and PIG ion sources were placed in the center of the cyclotrons. However, the development of more complicated and powerful ion sources such as the ECR sources required more space than was available at the center of the machines. Present-day cyclotrons have external ion sources and a low-energy beam from an electrostatic injector is threaded into the center via an axial channel and inflector or via a radial channel in separated- sector machines (described below). 

A) Tubes provide the effective heat transfer area between the fluids, with one fluid flowing inside the tubes and the other fluid flowing across the tubes on the outside. The tubes may be plain or bare, i.e., having a smooth surface, or they may be finned, having from 400 to 1600 fins/m. These fins are radial, like a pipe thread,... 

Fibers are frequently used in the form of a yam, mainly because a multifilament yam is more fl ble and pliable than a solid monofilament of the same diameter. The process of making a continuous, multifilament thread or yam from continuous or staple fibers is called spiraling. This nomenclature is rather unfortunate because the same term is also used to denote the process of making individual fibers by extmding through a spinneret. The fibers in a yarn are held in place through radial frictional compressive force generated by the twist that... 

Fig. 5.4 Simplified schematic diagram of the Bahco microparticle classifier showing its major components I, electric motor 2, threaded spindle 3, symmetrical disc 4, sifting chamber 5, container 6, housing 7, top edge 8, radial vanes 9, feed point 10, feed hole 11, rotor 12, rotary duct 13, feed slot 14, fanwheel outlet 15, grading member 16, throttle.

For DR surfactant solutions with thread-like micelles, Qi proposed a possible DR mechanism in pipe flow as shown in Fig. 16. At rest, thread-like micelles are distributed randomly in the solution. As Arb increases, the thread-like micelles near the wall are extended and start to align along the flow direction because of high wall-shear stress and the solution starts to show DR. Turbulent fluctuations decrease in the radial direction because of the micelle alignment and turbulent energy dissipation is reduced. 

Problem 12-3. Capillary Instability for a Thread in a Second Immiscible Fluid. In this problem, we consider the effect on capillary instability if, instead of being surrounded by air, the thread of liquid is surrounded by a second viscous immiscible fluid that is assumed to be unbounded in the radial direction. Derive a condition from which you could in principle, calculate the growth-rate parameter for an axisymmetric disturbance, a = a(k, Re, 7.) where k is the axial wave number and 7. is the ratio of the external fluid viscosity to the viscosity of the liquid thread. This condition can be simplified if either Re I or the thread is inviscid (though viscous effects still remain in the outer fluid). Evaluate a for several k values in each of these two cases. What is the qualitative effect of the second viscous fluid For example, is the range of unstable k values changed Is the fastest-growing linear mode changed relative to the case of a thread in air ... 

Much information is available on the deformation and fatigue behavior of simple thick-walled cylinders [10-17], but it must be remembered that most process reactors will not be a simple hollow cylinder. Components such as connectors, threads and sleeves, windows, and removable closures make a complete analytical solution for a high-pressure system design problem quite involved. Useful design criteria for thick-walled vessels can be derived, however, under the assumption that the material of which the vessel is made is isotropic and that the cylinder is long (more than five diameters) and initially free from stress. The radial and tangential stresses in the walls are then only functions of the radius coordinate (r) and the internal pressure. Given the outer-to-inner wall radius ratio as o/i = w, and the yield point (To) of the material, the yield pressure (py) is... 

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