Non-contact damage detection on a rotating blade by Lamb wave analysis

Propeller inspection is mandatory for safe operation of aircraft. Damage evaluation on such rotating structures requires dedicated measurement techniques. In this study efforts to create a stroboscopic technique are reported. Lamb waves were excited on a rotating blade with a Q-switched Nd:YAG laser synchronized to the sample rotation, whereas the wave amplitude was obtained by a laser Doppler vibrometer. A surface breaking notch on an aluminum sample rotating at 415 rpm was detected and sized with millimeter accuracy. The technique has potential for automatic non-contacting damage detection on rotating structures such as helicopter blades and turbines.Peer reviewe

Laser-ultrasonic delivery of agents into articular cartilage

Peer reviewe

Risky emotional family environment in childhood and depression-related cytokines in adulthood : The protective role of compassion

Background: Previously, compassion has been found to protect against depressive symptoms, while emotional adversities in childhood are suggested to increase inflammatory responses. The current study investigated (a) whether emotional family environment in childhood predicts levels of such cytokines in adulthood that are previously found to be elevated in depression (interleukin [IL]-2, IL-6, IL-1b, monocyte chemoattractant protein-1, interferon-gamma [IFN-gamma], and tumor necrosis factor alpha [TNF-alpha]) and (b) whether these associations are modified by compassion in adulthood. Methods: The participants (N = 1,198-1,523) came from the prospective population-based Young Finns data. Emotional family environment and parental socioeconomic factors were evaluated in 1980; participants' compassion in 2001; and participants' cytokine levels and adulthood covariates in 2007. Results: Risky emotional family environment in childhood predicted higher levels of IL-2, IL-6, IFN-gamma, and TNF-alpha in adulthood. Additionally, there were significant interaction effects between compassion and emotional risk in childhood, when predicting IL-2, IL-6, and TNF-alpha. Specifically, individuals who grew up in a risky emotional family environment had on average higher levels of IL-2, IL-6, and TNF-alpha in adulthood when combined with low compassion. Conclusions: In individuals coming from risky emotional family environments, high compassion for others may protect against elevated levels of cytokines previously linked with depression.Peer reviewe

Risky emotional family environment in childhood and depression-related cytokines in adulthood:the protective role of compassion

Abstract Background: Previously, compassion has been found to protect against depressive symptoms, while emotional adversities in childhood are suggested to increase inflammatory responses. The current study investigated (a) whether emotional family environment in childhood predicts levels of such cytokines in adulthood that are previously found to be elevated in depression (interleukin [IL]-2, IL-6, IL-1b, monocyte chemoattractant protein-1, interferon-gamma [IFN-γ], and tumor necrosis factor alpha [TNF-α]) and (b) whether these associations are modified by compassion in adulthood. Methods: The participants (N = 1,198–1,523) came from the prospective population-based Young Finns data. Emotional family environment and parental socioeconomic factors were evaluated in 1980; participants’ compassion in 2001; and participants’ cytokine levels and adulthood covariates in 2007. Results: Risky emotional family environment in childhood predicted higher levels of IL-2, IL-6, IFN-γ, and TNF-α in adulthood. Additionally, there were significant interaction effects between compassion and emotional risk in childhood, when predicting IL-2, IL-6, and TNF-α. Specifically, individuals who grew up in a risky emotional family environment had on average higher levels of IL-2, IL-6, and TNF-α in adulthood when combined with low compassion. Conclusions: In individuals coming from risky emotional family environments, high compassion for others may protect against elevated levels of cytokines previously linked with depression