In this paper, the effectiveness of stiffness and damping of bearing is investigated on the natural frequencies of the rotor-bearing system. The rotor-bearing system consists of a shaft, two bearings and a disk between two bearings. Parallel spring-damper in horizental and vertical directions is considered for modeling the stiffness and damping of bearings. The gyroscopic effect is also conside...

Squeeze Film Dampers (SFD) are commonly used for passive vibration control of rotor-bearing systems. The Magnetorheological (MR) and Electrorheological (ER) fluids in SFDs give a varying damping characteristic to the bearing that can provide active control schemes for the rotor-bearing system. A common way to model an MR bearing is implementing the Bingham plastic model. Adding this model to th...

BACKGROUND Mothers bearing small offspring are at increased risk of cardiovascular disease (CVD) mortality. The cardiovascular risk for fathers of small offspring is, however, inconclusive. Very few studies with sufficiently large sample sizes have been conducted to specifically differentiate the maternal/paternal CVD risk in association with offspring birth weight in the same population. MET...

Multiple sclerosis (MS) is a complex trait in which alleles at or near the class II loci HLA-DRB1 and HLA-DQB1 contribute significantly to genetic risk. HLA-DRB1*15 and HLA-DRB1*17-bearing haplotypes and interactions at the HLA-DRB1 locus increase risk of MS but it has taken large samples to identify resistance HLA-DRB1 alleles. In this investigation of 7,093 individuals from 1,432 MS families,...

Due to the increasing burden of revision in total knee arthroplasty (TKA), sustainable improvements in implant longevity may require the continued development of advanced bearing materials. The LEGIONTM Primary Knee System featuring VERILASTTM technology is the first device to combine an OXINIUMTM Oxidized Zirconium femoral component with a highly crosslinked ultra-high molecular weight polyeth...

The proportions of X and Y chromosome bearing sperms in human semen are equal, but more boys than girls are born.Male embryos and fetuses have a greater risk of attrition in utero than their female counterparts, and therefore male excess is likely to be still larger at the time of conception. It remains unexplained, however, what is responsible, presumably at some point between insemination and...

the purpose of this research was to assess the influence of several orchard systems involving trees trained to different leader numbers on growth, cropping, and fruit quality of two apple cultivars. the study was conducted during 1994-2007 at the fruit experimental station in samotwór, next to wrocław (south-western poland). one-year-old trees of ‘elstar’ and ‘jonagold’ cultivars on the m.9 roo...

in this paper, a simple and efficient method for modeling and solving the equations of a rotor with any number of disks, bearings and mass unbalances is presented using the assumed modes method. this model consists of a continuous shaft, arbitrary number of mass unbalances in any axial location and phase angle, and any number of rigid disks and bearings. this arrangement is extensively used in ...

This paper studies the connection between risk-sharing and organizational form. It models the organizational form decision as a trade-off between the superior capital market access of the stock form and a regulatory or agency advantage held by the mutual form. When capital is expensive, consumers will substitute away from paying investors to supply risk-bearing capital and toward bearing more r...

Aims: The goal of this study was to investigate possible associations of some single nucleotide polymorphisms (SNPs) in the VDR gene (the FokI, BsmI, ApaI and TaqαI loci), and the CYP17 gene (the MspA1I locus), and variable numbers of TA repeats in the SRD5A2 gene, with prostate cancer (PCa), among Lebanese men. Materials and Methods: Blood DNA samples of 50 subjects with confirmed PCa and 79 a...