Single crystals of nonlinear optical material bis (guanidinium) hydrogen phosphate monohydrate (G2HP) belonging to non centrosymmetric space group P 21c were successfully grown by the slow evaporation method. Optical transmittance and second harmonic generation of the grown crystals have been studied by UV-vis-NIR spectrum and Kurtz powder technique respectively. The transmittance of G2HP cryst...

background: optical mammography is a new diagnostic method that uses near-infrared for detection of functional abnormalities and shows tissue activities by measuring absorption and scattering of near-infrared light. this study aims to evaluate the safety and effectiveness of this technology. methods: cochrane library (issue 10, 2012) and medline (nov 2012) were searched using free text and mesh...

background and objective: vep is a powerful method to study visual system via evaluating evoked potentials. technologic and instrumental restrictions may be the reason of having studies on optical modulation and induction such as color, spatial frequency and contrast. developments of computer software and hardware may lead to an increase in the flexibility of pattern designs. material and meth...