objective: the aim of this study was to evaluate and compare the effect of dental surface treatment with er:yag , nd:yag ,co2 lasers and sodium ascorbate to recently laser bleached enamel by scanning electron microscope (sem). methods: 15caries-free extracted human third molars were selected for this study. the samples were bleached by heydent jw power activated by diode laser 810 nm. after 7 d...

Air conditioning refrigerant R134a has value of global warming potential (GWP) 1300, which is much higher than MAC Directive (GWP below 150) passed in July 2006. This prompted a search for alternative refrigerant with GWP value less than 150. R1234yf is a new refrigerant which has lower GWP value of 4. Effect of blower speed has been compared and flammability issue of R1234yf has been addre...

The objective of this work is to design and construct a low cost Electromyogram (EMG) and Electrooculogram (EOG) signal conditioning system for assistive device applications. The proposed circuit is designed for capturing surface EMG signal and EOG signal available on the surface of the human skin. This paper describes the system containing two units: signal detection unit and signal conditioni...

The delayed outward current in snail neurones was separated into two components with different temperature sensitivity: (i) a persistent component and (ii) a transient (inactivating) component. The effect of cooling on the value of the transient current is strongly dependent upon the value of the conditioning potential. It was supposed that cooling causes a decrease in the negative surface pote...

OBJECTIVE Transcranial double magnetic stimulation on the motor cortex was used to investigate central motor tract function in 16 patients with amyotrophic lateral sclerosis, five with spinal muscular atrophy, and 16 age matched normal controls. METHODS Surface EMG responses were recorded from the relaxed abductor pollicis brevis (APB) muscle. RESULTS Responses to test stimuli were markedly...

The preparation and conditioning of DNA-modi®ed electrodes, in which glassy carbon electrodes are covered by a thick ®lm of double-stranded DNA and subsequently conditioned in acetate bu€er, has been followed with Electrochemical Impedance Spectroscopy. Spectra were recorded at di€erent values of applied potential in order to probe the alterations occurring in the modi®er layer. The alterations...

The Cosmetic Ingredient Review Expert Panel (Panel) reviewed the safety of 62 dimethicone crosspolymer ingredients as used in cosmetics. These ingredients function mostly as absorbents, bulking agents, film formers, hair-conditioning agents, emollient skin-conditioning agents, slip modifiers, surface modifiers, and nonaqueous viscosity-increasing agents. The Panel reviewed available animal and ...

and microhardness of Admira and Definite following acid conditioning. Half of the samples were either used as controls or brushed for 10 minutes using an electric teothbrush with srurry. The remaining specimens were st・ored in orthophosphorie acid with a pH of 1.9 for 24 hours and then half were brushed. The surface roughness of Admira and Definite was not significantly at'fected by storage und...

The high accelerating gradients required for future linear colliders demands a better study of field emission and RF breakdown in accelerator structures. Changes in structure geometry, vacuum pumping, fabrication methods, and surface finish can all potentially impact the conditioning process, dark current emission, and peak RF power handling capability. Recent tests at SLAC of KEK’s “M2” travel...

little is known about the interaction of tissue conditioners and modeling plastics. this study evaluates the influence of a variety of commercial tissue conditioners on alteration of viscoelastic properties of modeling plastics.in this in vitro study, the dynamic viscoelastic properties of four commercially available tissue conditioners (tc), visco-gel (vg), gc soft-liner (sl), fitt (ft), and c...