The torsional resistance and wear debris generation of the modular sleeve and stem S-ROM total hip system was evaluated. The results indicate that slippage of the sleeve-stem interface may occur under physiological loading conditions. Slippage is more likely to occur if the junction is contaminated by blood or tissue, or if the stem is disengaged and reimplanted into the sleeve. Significant ...

In this paper we investigate some properties of congruences on ternary semigroups. We also define the notion of congruence on a ternary semigroup generated by a relation and we determine the method of obtaining a congruence on a ternary semigroup T from a relation R on T. Furthermore we study the lattice of congruences on a ternary semigroup and we show that this lattice is not generally modular...

The presence of a deficient or mechanically compromised proximal femur represents a particular challenge to revision total hip arthroplasty. This article details the results of reconstructing these challenging cases using a modular, tapered, and distally fixed femoral stem component that allows independent control of length, offset, and anteversion of the femur. Mid-term results suggest that di...

We report herein a set of deoxyribozyme-based logic gates capable of generating any Boolean function. We construct basic NOT and AND gates, followed by the more complex XOR gate. These gates were constructed through a modular design that combines molecular beacon stem-loops with hammerhead-type deoxyribozymes. Importantly, as the gates have oligonucleotides as both inputs and output, they open ...

‎In this paper, based on [A. Razani, V. Rako$check{c}$evi$acute{c}$ and Z. Goodarzi, Nonself mappings in modular spaces and common fixed point theorems, Cent. Eur. J. Math. 2 (2010) 357-366.] a fixed point theorem for non-self contraction mapping $T$ in the modular space $X_rho$ is presented. Moreover, we study a new version of Krasnoseleskii's fixed point theorem for $S+T$, where $T$ is a cont...

Quality of Classroom Life is considered as a serious issue in academia around the world, and it has recently received global inquiry in EFL and ESL contexts. However, no questionnaire has been developed to assess the Iranian students’ and teachers’ attitudes towards the quality of life in the classroom. After developing a conceptual framework, the final draft of the developed questionnaire with...

The prevalent strategy in the topology optimization phase is to select a subset of members existing in an excessively connected truss, called Ground Structure, such that the overall weight or cost is minimized. Although finding a good topology significantly reduces the overall cost, excessive growth of the size of topology space combined with existence of varied types of design variables challe...

As the number of primary THRs of younger patients with high physical demands increases, the amount of revision operations also grows. Bone loss with severe osteolysis, joint instability, function of pelvitrochanteric muscles, leg length discrepancy, a proper antetorsion angle, cement mantles, periprosthetic fractures, or infections are problems to be considered in revision arthroplasties of the...

As the prevalence of revision total hip arthroplasty increases, the mechanisms of failure of these revisions have become better delineated. Several studies have indicated infection, instability, and aseptic loosening to be the more common mechanisms of failure in revision surgery. However, with increasing numbers of revisions performed, unique mechanisms of failure are being seen, likely relate...