background : the aim of this study was to investigate the effect of pulsed ultra-violet (uv) irradiation on inactivation of beer spoilage microorganisms. uv irradiation is nowadays cost effective enough to compete with traditional biological, physical, and chemical treatment technologies and has become an alternative to such methods. material and methods : photoinactivation effects of pulsed uv...

Sheet metal forming processes, the purpose of which is to give shaped material appropriate mechanical, dimensional and shape properties, are characterised by different values unit pressures lubrication conditions. Increasing efficiency tool work increasing their durability, reliability still one main indicators production efficiency. Tool wear in technologies significantly differs from characte...

Abstract In SLS sintering forming, laser power and scanning speed are two important process parameters, which directly affect the dimensional accuracy of sintered parts. Using PA2200 powder as forming material, influence on part was analyzed. Through theoretical analysis experimental verification, best combination parameters obtained. The is 40 W scan 5000 mm/s. parts obtained by X-direction de...

In this article, we present a novel method of quantitatively measuring mixing using laser induced fluorescence. This method is independent of flow and light sheet characteristics. The premise of this work is that molecular level mixing can be quantified through a scalar pH field in an aqueous solution. A two dimensional pH field can be determined in the solution by imaging the laser induced flu...

Human enamel surface was irradiated with ArF excimer laser and examined under light microscopy and scanning electron microscopy (SEM). Enamel surface was irradiated at three different areas with different energy fluences. It is demonstrated that the ArF excimer laser causes ablation of the calcified hard enamel tissue. Ablation curves were measured. There was no significant difference found in ...

OBJECTIVES To define the role of epiglottic anteversion in the etiology of globus pharyngeus (GP) and to evaluate the effectiveness of laser partial epiglottectomy in its treatment. PATIENTS AND METHODS Four patients who admitted to our clinic between 2001 and 2003 with the complaint of GP underwent laryngoscopic examination, which revealed a structurally anteverted epiglottis that was in con...

The effects of nanosecond laser peening on Zr41Ti14Cu12.5Ni10Be22.5 metallic glass were investigated in this study. The peening treatment produced an extra-deep shock-affected zone compared to crystal metal. As opposed to the conventional shear bands, numerous arc shear bands appeared and aggregated in the vertical direction of the laser beam, forming basic units for accommodating plastic defor...

In the laser deposition of single crystal and directionally-solidified superalloys, it is desired to form laser deposits with high volume fractions of columnar grains by suppressing the columnar-to-equiaxed transition efficiently. In this paper, the influence of beam profile (circular and square shapes) and cooling conditions (natural cooling and forced cooling) on the geometric morphology and ...