BACKGROUND The carina level has been shown to be near the pericardial reflection and can easily be identified as a landmark on a routine chest radiography. The purpose of this study was to reveal a simple method to predict the adequate central venous catheter (CVC) depth, hereby facilitating safe positioning of the CVC tip. METHODS Central venous catheterization was performed via the right in...

myocardial fractional flow reserve (ffr) is a new index of the functional significance of intermediate coronary stenoses that is calculated from pressure measurements made during coronary arteriography. the aim of this study was to evaluate the correlation between non-hyperemic coronary pressure dicrotic notch and fractional flow reserve (ffr). a consecutive of 114 patients (73 men and 41 women...

The unavoidable occurrence of microdefects in silicon wafers increase the probability of catastrophic fracture of silicon-based devices, thus highlighting the need for a strengthening mechanism to minimize fractures resulting from defects. In this study, a novel mechanism for manufacturing silicon wafers was engineered based on nanoscale reinforcement through surface nanotexturing. Because of n...

Scour in bed material downstream weirs is considered the most unfavorable process which threats the overall stability of the weir. Weirs with oblique angle in the horizontal plan will affect the scour profile downstream the structure and may reduce it. The objective of this paper is to investigate the effect of oblique weir angle on the scour profile. Furthermore, the effect of V-notch angle on...

In this study, the notch effect of different types 304 stainless steel rod is studied because problem difficulty in measuring root strain steel, and parameters annular are analyzed. The angle, depth, radius main stress field affecting notch, mathematical expression rate concentration factor derived. order to verify accuracy theory, mechanical model bar established by finite element numerical si...

Anterior femoral notching during total knee arthroplasty is a potential risk factor for periprosthetic supracondylar femur fracture. We conducted a study to determine if the design of the femoral implant changes the risk for periprosthetic supracondylar femur fractures after anterior cortical notching. An anterior cortical defect was created in 12 femoral polyurethane models. Six femora were in...

This paper presents a feed-forward control scheme for rejecting stochastic narrow band disturbances. The effect of this scheme manifests itself as a tunable notch on the sensitivity transfer function frequency response, where the target frequency, width, and depth of the notch can be set by prescribed design parameters. This approach is based on employing least mean square adaptive control that...

Notch signaling, an evolutionarily conserved signaling cascade system, is involved in promoting the progression of different types of cancers. Within the past decades, the Notch signaling pathway has increasingly been shown to have a primary role in deciding the fate of cancer cells and cancer stem cells in the stomach. Most components of Notch signaling are strongly expressed at different leve...

Hydrocode simulations were conducted to analyze the non-linear response of 1100-O aluminum plates with semi-circular notches. Plates with constant notch depth and notch root radius were loaded (normal to the notch-tip plane) to the same shock stress while the notch spacing was varied. The resulting stress distributions were analyzed at specific locations between adjacent notches and then the ma...