One of the bellows producing method is hydroforming process .Whereas some factor of hydroforming process specially internal pressure affects on final characteristics produced bellows such as bursting, wrinkling and wall thickness distribution. In this paper the effect of internal pressure factor in final quality of produced bellows will be investigated. In simulation of process, ABAQUS/Explicit...

Experimental and simulation study of RF modes were carried out for the complicated geometry of the shielded vertex bellows near the IP region of the PEP-II B-factory. A beam position monitor button electrode located 50 cm from the bellows provides a signal for spectrum measurement. Calculations indicate monopole, dipole and quadrupole modes can exist in the bellows structure near the experiment...

Bellows are special structures that require high strength as well as good flexibility. The design, manufacture, and analysis of bellow tubes thus are more complicated. Test of bellows to understand their mechanical behavior, and to verify a design purpose finite element program is needed for practical use. In this paper, digital-image-correlation method is applied to measure the stiffness of si...

For many cardiac MR applications, respiratory bellows gating is attractive because it is widely available and not disruptive to or dependent on imaging. However, its use is uncommon in cardiac MR, because its accuracy has not been fully studied. Here, in 10 healthy subjects, the bellows and respiratory navigator (NAV) with the displacement of the diaphragm and heart were simultaneously monitore...

In this paper, for the first time, a comprehensive experimental study is performed on hydroforming process of metallic bellows. For this purpose, the effects of the main process parameters and their interactions on the characteristics of hydroformed metallic bellows are investigated using Response Surface Methodology (RSM). The selected parameters as input variables are internal pressure, die s...

Introduction: The two most common methods for respiratory compensation of cardiac MR (CMR) studies are breath-holding and navigator-gating. Respiratory bellows is a long-established, readily available method, but has been rarely used in cardiac imaging, with some exceptions [1,2,3]. This study compares the performance of respiratory chest wall and abdomen bellows to navigator-gating (NAV), and ...

In commercial nuclear power plants, many containments use stainless steel bellows at piping penetrations, in dry well-to-wetwell vent lines, or as a part of the fuel transfer tube. Bellows are an integral part of the primary contain ment pressure boundary in nuclear power plants. These bellows allow for thermal expansion and contraction of the pipe, vent line, or fuel transfer tube, and accommo...

We investigated the effect of a small bellows leak (bellows full at end-expiration) on inspired oxygen fraction (Fio(2)), exhaled tidal volume (Vt), airway pressure, and room contamination in an oxygen-driven anesthesia ventilator (Ohmeda 7810, Madison, WI). CO(2) concentration at the ventilator exhalation valve, Fio(2), Vt, and airway pressure were measured (n = 3) while ventilating a CO(2)-pr...

one of the bellows producing method is hydroforming process .whereas some factor of hydroforming process specially internal pressure affects on final characteristics produced bellows such as bursting, wrinkling and wall thickness distribution. in this paper the effect of internal pressure factor in final quality of produced bellows will be investigated. in simulation of process, abaqus/explicit...

Cameras with bellows give photographers exibil-ity for controlling perspective, but once the picture is taken, its perspective is set. We introducèvir-tual bellows' to provide control over perspective after a picture has been taken. Virtual bellows can be used to align images taken from diierent viewpoints, an important initial step in applications such as creating a high-resolution still image...