Beam pipes of high-energy superconducting colliders require a shielding tube (liner) with pumping slots to screen cold chamber walls from synchrotron radiation. Pumping slots in the liner walls are required to keep high vacuum inside the beam pipe and provide for a long beam lifetime. As previously discussed [Fedotov and Gluckstern, Phys. Rev. E 54, 1930 (1996)], for a long narrow slot whose le...

Usually, the heating, ventilation, and air conditioning (HVAC) duct system in buildings is a complex network of hollow metal pipes of rectangular or circular cross-section which behave as multimode waveguides when driven at RF and microwave frequencies of common interest. HVAC ducts can be used as a wireless communication channel for providing high-speed network access to offices [1]. An exampl...

Purpose An integral component in heat pipes (HPs) and vapor chambers (VCs) is a porous wicking structure. Traditional methods for manufacturing structures within HPs VCs involve secondary processes are generally limited to simple geometries. This work aims leverage the unprecedented level of design freedom laser powder bed fusion (LPBF) additive (AM) produce integrated VCs. Design/methodology/a...

This report summarizes the surface roughness wake eld study for the TESLA FEL transfer line and the undulator. At present di erent models have been developed by K.Bane [1], G.Stupakov [2], A.Novokhatski, M.Timm,T.Weiland [3] to study the e ect of a random surface roughness in a beam pipe, and by K.Bane, A.Novokhatski [4], G.Stupakov [5], M.Dohlus [6] to calculate the wake in beam pipes with per...

The Auditorio Juan Victoria is a concert hall located in the homonym cultural building inaugurated in 1970, in San Juan province, Argentina. It seats 976 on an audience area of rectangular plant. The scenario is fan shaped and has the capacity for 80 seated musicians and 90 choristers standing. Hall dimensions are of about 22 m width, 40 m length and 10 m height. The hall is equipped with a pip...

High-density polyethylene pipes (HDPE), crossbonded polyethylene pipes (PEX) and polyvinyl chloride (PVC) pipes for drinking water were tested with respect to migration of volatile organic components (VOC) to water. The odour of water in contact with plastic pipes was assessed according to the quantitative threshold odour number (TON) concept. A major migrating component from HDPE pipes was 2,4...

I Research on fundamentals for multiphase pipelining ................................................... 1 II Accomplishments of our previous DOE/DE-FG02-87ER 13798, 9/1/98--8/31/01...... 2 III Lubricated transport of viscous oils. Friction factor efficiency ratio......................... 5 IV Numerical simulation of laminar wavy core flow...........................................................

Continuous casting is used to mass produce basic metals into long, semi-finished shapes with constant cross section, which are later processed into over 800 million tons of steel, 20 million tons of aluminum, and 1 million tons of copper, nickel, and other metal products in the world each year. Cross-sections can be rectangular, for later rolling into plate or sheet, square for long products, c...

This work explores capillary flow through micropillar arrays with rectangular pillar arrangements. The effects of these configurations on permeability and capillary pressure are investigated for heat pipe wick applications. The permeability is described in terms of three dimensionless parameters: h=d; l=d, and S=d, where l and S are the edge-to-edge spacings in the xand y-directions, respective...