Al2O3 films were prepared using electron beam evaporation at room temperature. The samples were irradiated with oxygen plasma under different energy. The variations in average surface defect density and root mean square (RMS) surface roughness were characterized using an optical microscope and an atomic force microscope. Surface average defect density increased after plasma treatment. The RMS s...

We use Hurricane Katrina’s damage to the Mississippi coast in 2005 as a natural experiment to study business survival in the aftermath of a cost shock. We find storm damage had a “cleansing” effect on businesses: damaged establishments that returned to operation were more resilient than those that had never been damaged. This effect is particularly strong for establishments belonging to younger...

Employment contracts are often incomplete, leaving many responsibilities subject to workers’ discretion. High work morale is therefore essential for sustaining voluntary cooperation and high productivity in firms. We conducted a field experiment to test whether workers reciprocate wage cuts and raises with low or high work productivity. Wage cuts had a detrimental and persistent impact on produ...

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sever coldness causes damage to the wheat and affect its growth and yield, thereby this experiment was conducted in controlled conditions to investigate freezing tolerance of 29 wheat genotypes. acclimation treatments (in two levels: acclimation and non-acclimation) were considered in the main plot and combination of temperature (0, -4, -8, -12, -16 ◦c) and genotypes as sub plot. survival perce...

Many in-service bridges with steel–concrete composite beams are currently aging and experiencing performance deterioration. Under long-term cyclic loads from traffic on bridges, headed shear studs in vulnerable to fatigue damage. The comprehensive understanding of behaviors the feasible detection damage is, thus, crucial for accurate numerical simulation crack propagation process. paper, experi...

Abstract Damage detection in rotating machines is well established for vibration signals. Unfortunately, there are situations, where usage of not possible. Then, acoustic signal could be used instead. usually more noisy and require special treatment obtain successful damage detection. In the paper we propose to use Variational mode decomposition (VMD) omit noise finding de-noise signal. We data...