Principal component analysis of influence of organizational justice on employee engagement.

This paper presents the major organizational justice factors influence on employee engagement in a context of banking sector in Trincomalee District. Based on principal component analysis (PCA), correlation and descriptive statistical analysis of the factors believed to influence that organizational justice on employee engagement therefore clustered into principal component. The sampling test conducted using Bartlett’s test of sphericity and KMO measure of sampling adequacy (MSA) to ascertain the level relationship and the pattern between variables was found to be very significant with MSA (0.940).The result of the analysis found to have four components displayed eigenvalues greater than 1. Therefore, the entire factor can be put into four principal components which accounted for 77.650% of the total variance. Statistically there was strong interrelationship among the variables in the (PCA) with p-value <0.05 .The principal components are feedback, unbiased, Pay and Stresses and Strains and pay and effort

Fracture through cavitation in a metallic glass

The fracture surfaces of a Zr-based bulk metallic glass exhibit exotic multi-affine isotropic scaling properties. The study of the mismatch between the two facing fracture surfaces as a function of their distance shows that fracture occurs mostly through the growth and coalescence of damage cavities. The fractal nature of these damage cavities is shown to control the roughness of the fracture surfaces

Deformation and crystallization of Zr-based amorphous alloys in homogeneous flow regime

The purpose of this study is to experimentally investigate the interaction of inelastic deformation and microstructural changes of two Zr-based bulk metallic glasses (BMGs): Zr_(41.25)Ti_(13.75)Cu_(12.5)Ni_(10)Be_(22.5) (commercially designated as Vitreloy 1 or Vit1) and Zr_(46.75)Ti_(8.25)Cu_(7.5)Ni_(10)Be_(27.5) (Vitreloy 4, Vit4). High-temperature uniaxial compression tests were performed on the two Zr alloys at various strain rates, followed by structural characterization using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two distinct modes of mechanically induced atomic disordering in the two alloys were observed, with Vit1 featuring clear phase separation and crystallization after deformation as observed with TEM, while Vit4 showing only structural relaxation with no crystallization. The influence of the structural changes on the mechanical behaviors of the two materials was further investigated by jump-in-strain-rate tests, and flow softening was observed in Vit4. A free volume theory was applied to explain the deformation behaviors, and the activation volumes were calculated for both alloys

Excess compressibility and excess volume studies in the binary mixtures of methyl and ethyl acetate in O-chlorophenol at different temperatures

Ultrasonic velocity and density measurements have been carried out in the binary mixtures of methyl acetate (MA) and ethyl acetate (EA) in O-chlorophenol (OCP) at 303.15, 308.15, 313.15, 318.15 and 323.15 K. From the experimental data, the excess thermodynamical parameters such as excess adiabatic compressibility (β), excess intermolecular free length (L) and excess molar volume (VE) have been calculated. The results have been interpreted in terms of intermolecular interactions leading to complex formation through the formation of hydrogen bonds between the component molecules of the mixture

Effect of strain rate on the yielding mechanism of amorphous metal foam

Stochastic amorphous Pd_(43)Ni_(10)Cu_(27)P_(20) foams were tested in quasistatic and dynamic loading. The strength/porosity relations show distinct slopes for the two loading conditions, suggesting a strain-rate-induced change in the foam yielding mechanism. The strength/porosity correlation of the dynamic test data along with microscopy assessments support that dynamic foam yielding is dominated by plasticity rather than elastic buckling, the mechanism previously identified to control quasistatic yielding. The strain-rate-induced shift in the foam yielding mechanism is attributed to the rate of loading approaching the rate of sound wave propagation across intracellular membranes, thereby suppressing elastic buckling and promoting plastic yielding

Properties and bending behavior of Nickel coated Mild steel sheet during air bending

Springback refers to the elastic recovery which subject to a geometrical change when the metal undergoes deformation during the forming process. The experimental investigation of this paper is focused to analyze the behavior of spring back of nickel coated mild steel (NCMS) sheets during the air bending process. The hardeness and surface roughness was measured after coating. Experimental investigation have been conducted to resolve the influence of control parameters such as Orientations (θ), Width of the sheet (Ws), Punch travel (Tp), Holding time (Ht) and Punch Velocity (v) on spring back behavior. As a results, the incraese in Orientations, Width of the sheet, Punch travel andd Punch Velocity incraese the springback angle.&nbsp

Shockwaves in converging geometries

Plate impact experiments are a powerful tool in equation of state (EOS) development, but are inherently limited by the range of impact velocities accessible to the gun. In an effort to dramatically increase the range of pressures which can be studied with available impact velocities, a new experimental technique is being developed. The possibility of using a confined converging target to focus Shockwaves and produce a large amplitude pressure pulse is examined. When the planar shock resulting from impact enters the converging target the impedance mismatch at the boundary of the confinement produces reflected Mach waves and the subsequent wave interactions produce a diffraction cycle resulting in increases in the shock strength with each cycle. Since this configuration is limited to relatively low impedance targets, a second technique is proposed in which the target is two concentric cylinders designed such that the inner cylinder will have a lower shock velocity than the much larger shock velocity in the outer cylinder. The resulting dispersion in the wave front creates converging shocks, which will interact and eventually result in a steady Mach configuration with an increase in pressure in the Mach disk. Numerical simulations indicate a significant increase in pressure for both methods and show promise for the proposed concepts

A Modulation Technique for Sensorless Control of Switched Reluctance Motor

The switched reluctance motor (SRM) uniquely bears several merits with respect to other motor configurations. Especially, the construction of the rotor is simple in the sense that it neither contains copper not contains permanent magnets. Because of this construction, likelihood of rotor’s failure is less than the other motor configurations. This makes this motor more suitable for harsh environments. On the flip side, this motor cannot directly operate with AC or DC power source and needs electronic commutation. For commutation, the information on instantaneous orientation of the rotor is essential. Since inclusion of appropriate sensor adds to the cost and complexity of the system, sensor-less commutation of SRM gained interest among the researchers and has been studied extensively in literature. The techniques for sensorless control of SRM can be broadly classified into Active phase and Idle phase techniques. Idle phase techniques are generally believed to be not suitable for high speed operation beause of tail current in a phase, i.e., because of inductive nature of the phase, it takes time for flow of current to stop. This paper proposes a novel idle phase technique that is conducive for high speed operation of switched reluctance motor