This paper presents the design, fabrication and measurement of the first pull-in free tunable evanescent-mode microwave resonator based on arrays of electrostatically actuated fringing-field RF-MEMS tuners. Electrostatic fringing-field actuation (EFFA) is the key on achieving a wide tunable frequency range that is not limited by the conventional pull-in instability. Furthermore, total lack of d...

The mass-spring model of electrostatically actuated microelectromechanical systems (MEMS) or nanoelectromechanical systems (NEMS) is pervasive in the MEMS and NEMS literature. Nonetheless a rigorous analysis of this model does not exist. Here periodic solutions of the canonical mass-spring model in the viscosity dominated time harmonic regime are studied. Ranges of the dimensionless average app...

purpose: to evaluate and compare tear secretion and tear film instability following laser in situ keratomileusis (lasik) and laser assisted subepithelial keratectomy (lasek). methods: in a randomized clinical trial, 30 eyes of 15 patients underwent lasik and 30 eyes of 15 patients underwent lasek to correct myopia. tear secretion and tear film instability were tested preoperatively, 2 and 6 wee...

Current clinical assessments do not adequately detect the onset of postural instability in the early stages of Parkinson's disease (PD). The aim of this study was to identify biomechanical variables that are sensitive to the effects of early Parkinson's disease on the ability to recovery from a balance disturbance. Ten adults diagnosed with idiopathic PD and no clinically detectable postural in...

The purpose of this research was to conduct a comparison the push and pull factors affecting migration between Poland Romania. study aimed find out which among have greater effect overall individually on activities. conducted using primary data collected from migrants in both countries structured questionnaire. There were 298 288 surveys for Romania, respectively. framework applied guide study....

Hoffa fractures are known as coronal fractures of the femoral condyle and are rare injuries account for less than 1% of distal femur fractures [1-4]. The association of Hoffa fracture and proximal tibial fractures is even rarer [5]. It is an intraarticular fracture of the posterior aspect of the femoral condyle in coronal plane, resulting from high-energy traumas motor vehicle accidents (most c...

In this paper, dynamic behavior of a functionally graded cantilever micro-beam and its pull-in instability, subjected to simultaneous effects of a thermal moment and nonlinear electrostatic pressure, has been studied. It has been assumed that the top surface is made of pure metal and the bottom surface from a metal–ceramic mixture. The ceramic constituent percent of the bottom surface ranges fr...

In this paper, we propose a numerical model to describe the adhesive normal contact between glass spherical indenter and viscoelastic rough substrate of PDMS material. The accounts for dissipative process under assumption that losses are localized at (micro)-contact lines. Numerical predictions then compared with experimental measurements, which show strong adhesion hysteresis mostly due viscou...