In this paper, the free vibration behaviors and flexural sensitivity of atomic force microscope cantilevers with small-scale effects are investigated. To study the small-scale effects on natural frequencies and flexural sensitivity, the consistent couple stress theory is applied. In this theory, the couple stress is assumed skew-symmetric. Unlike the classical beam theory, the new model contain...

This paper presents a novel method for the analysis of heart rate variability (HRV) during exercise stress testing enhanced with respiratory information. The instantaneous frequency and power of the low frequency (LF) and high frequency (HF) bands of the HRV are estimated by parametric decomposition of the instantaneous autocorrelation function (ACF) as a sum of damped sinusoids. The instantane...

Research studies have identified heightened psychiatric problems among veterans of Operation Iraqi Freedom (OIF) and Operation Enduring Freedom (OEF). However, these studies have not compared incidence rates of psychiatric disorders across robust cohorts, nor have they documented psychiatric problems prior to combat exposure. The authors' objectives in this study were to determine incidence rat...

Electrochemical impedance spectroscopy (EIS) was used to detect stress corrosion cracking (SCC) in stainless steel 304 alloy exposed to an aqueous environment at 120 °C. Stainless steel 304 alloy as u-bend was tested in the solution that contains 40 weight percent of magnesium chloride. U-bended samples were prepared according to ASTM G30. EIS measurements were always performed simultaneously o...

Background: Stress may cause damages to DNA or/and change the ability of the cells to overcome these damages. It may also cause irregularities in the cell cycle and induce abnormal cell divisions through glucocorticoid-dependent functions. The abnormal cell divisions, in turn, lead to chromosomal mal-segregation and aneuploidy. In this study, the effects of the stress hormone, hydrocortisone (H...

Abstract We have developed a new technique for diagnostics in connection with vibration stress relief. The measurement images by us unique acoustic spectrum recording are not only suitable determining the natural frequencies of metal castings, but can also be deduced from them dislocation crystal structure and residual stress, which cause deformation later. From changes between images, effect d...

In this work, gate dielectric degradation under dynamic Fowler-Nordheim (FN) stress is studied. A novel interface characterization technique, direct-current current-voltage (DCIV) technique, is used to measure the interface trap generation caused by dynamic FN stress. The dependence of interface trap generation on stress time is always found to follow a power-law, which is similar to the situat...

Abstract Designing optimum energy harvesting devices is the aim of several developments based on numerical or analytical studies different piezoelectric configurations that usually consider constant properties. Experimental tests bending patches showed electrical response depended frequency and amplitude mechanical excitation for displacement-imposed systems. Analytical calculations required ad...