Abstract In this paper a new model has demonstrated that it operates in moderate performance scale to generate hot water. its early stage, the preliminary model, which built with double pass water tube inside evacuated tube, was investigated experimentally. The tested room under different operation conditions terms of solar radiation 300, 400, 500 and 600 W/m 2 mass flow rates 0.00305 0.0083kg/...

The different branch diameters of five-way tube affect the design loading internal pressure in hydroforming process, where large-diameter is broken more easily than small-diameter one due to same ultimate stress material one-step forming method. Therefore, first four-way and then multi-step (FFTF) method three-way (FTTF) were proposed fabricate 5A02 aluminum alloy with two kinds avoid burst tub...

Crash-dynamics research has always concentrated significantly in the safety, survivability of passengers a car crash. To identify capability energy absorption crash box, thin-walled structure will be modeled and simulated by ABAQUS software. Investigate influence material, cross-sectional, thickness factors on capacity tube, using MCDM – Multi-Criteria Decision-Making to get best option testing...

Evacuated-tube solar collector (ETSC) is developed to achieve high heating medium temperature. Heat transfer fluid contained inside a copper heat pipe directly affects the A 10 mol% of ethylene-glycol in water this system. The purpose study modify inner structure evacuated tube for promoting through aluminum fin by inserting stainless-steel scrubbers increase conduction surface area. experiment...

The implosion of cylindrical shell structures in a high-pressure water environment is studied experimentally. The shell structures are made from thin-walled aluminium and brass tubes with circular cross sections and internal clearance-fit aluminium end caps. The structures are filled with air at atmospheric pressure. The implosions are created in a high-pressure tank with a nominal internal dia...

dotracheal tube and are composed of inspiratory and expiratory corrugated limbs. The two breathing tubes carry respiratory gases with volatile anesthetics to and from patients during general anesthesia. Although longer corrugated breathing tubes allow the anesthesia machine to be located farther from the patients, they are so long and flexible that they tend to hang down below the operating tab...

introduction: the aim of this study was to assess shear bond strength of composite to dentin after air abrasion and laser treatment. methods: 40 human extracted molars divided into 4 groups (n=10) received the following treatments. group 1: carbide bur, group 2: air abrasion with aluminum oxide 50 μm, group 3: irradiated with erbium-doped yttrium aluminum garnet (er: yag) laser (150 mj/20hz), g...

introduction one of the best methods in the diagnosis and control of breast cancer is mammography. the importance of mammography is directly related to its value in the detection of breast cancer in the early stages, which leads to a more effective treatment. the purpose of this article was to calculate the x-ray spectrum in a mammography system with monte carlo codes, including mcnpx and mcnp5...

This study compared Mallinckrodt® Laser-FlexTM with polyvinyl chloride endotracheal tubes (ETTs) wrapped with aluminum foil tape, copper foil tape, or Merocel® Laser-Guard laser-resistant wrap to determine ifspecular reflection occurred during exposure to a carbon dioxide (co2) laser. The ETTs were straightened and centered within cardboard cylinders and exposed to a laser set at 25 W for a max...