In oilfield equipment, a significant place is occupied by clamping mechanisms used to grip pipes during tripping operations. They are mainly divided into 2 groups. The first includes with forced of the part. second group self-clamping devices wedge mechanism. Here, force increases in proportion axial shear force. these devices, jaws serve as common element. addition smooth jaws, there may be no...

This paper investigates the effects of the absorption of water and several other reactive species on the adhesion energy between organosilicate glass (OSG) thin films and various capping layers. The adhesion energy of these interfaces was measured by four-point bending tests conducted at room temperature in an ambient environment. The amount of absorbed reactant in the organosilicate glass film...

Case Description- Umbilical hernia is occasionally seen with different levels of complexity in animals This emergency condition requires quick diagnosis and is corrected with various surgical approaches. The aim of this paper is to report the surgical correction of an eviscerated umbilical hernia with extensive adhesion in a bovine calf. Twenty days old indigenous male bovine c...

The effect of an asymmetric distribution of asperity heights is accounted for in a recently developed scale-dependent multiasperity model of contact and friction. A Weibull distribution of asperity heights is used which allows the skew and kurtosis to be varied, but not independently of each other. The contact and friction model used includes the effects of adhesion and of scale-dependent frict...

A large number of methods have been developed to characterize the adhesion a thin film substrate. Among them, tape test is still one most popular methods. Acoustic waves and especially ultra-high frequency acoustic are also sensitive defects as they affect way reflected at such an interface. In this work, we first prepare series identical thin-film samples with variable interface between its To...

In order to solve the problem where traditional electric power steering system (EPS) provides too much assist torque under low load and adhesion coefficient, which damages driver’s road feeling affects driving safety, this paper designs a multi-map EPS control strategy. First, based on change of resistance different front axle loads coefficients, characteristics considering coefficient were des...

post operative adhesion formation is a very important clinical problem because of its complications such as pain, bowel obstruction, infertility and subsequent intra-operative complications. we aimed to investigate the effects of melatonin (me), as an agent acting against free radicals, on the prevention of adhesion formation. background: a number of 39 rats were randomly assigned into three gr...