Multi-pumping mechanised determination of selenium in natural waters by light emitting diode (LED) spectrometry
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منابع مشابه
Comparative evaluation of the effect of Light Emitting Diode (LED) and Quartz Tungsten Halogen (QTH) light curing units on color stability of Filtek Z350 XT
Introduction:Discoloration of the resin-based composites is a common problem in restorative dentistry. There are many factors associated with the discoloration of dental materials in the oral environment. The purpose of this study was to evaluate the color changes in a nano-composite cured with a quartz-tungsten-halogen (QTH) and light emitting diode (LED) unit. Methods:80 disk-shaped specim...
متن کاملEvaluation of the Effect of Protective Sleeve on Output Intensity of Light Emitting Diode Light Cure Units
Aim: The purpose of this study was to compare the difference in the output intensity of Light Emitting Diode (LED) light cure (LC) devices with and without a protective sleeve and its clinical significance. Materials and Methods: The output intensity of 152 LC units in dental offices across the state of Odisha were examined. The collection of related information included an average number of e...
متن کاملOptimization of light conditions by affecting the growth and production of C-Phycocyanin in Spirulina platensis microalgae
Spirulina microalgae are a rich source of protein and valuable biological compounds. One of the most important Spirulina microalgae pigments is phycocyanin. Phycocyanin is widely used in industries as a natural blue pigment and it’s also an effective antioxidant. In order to improve phycocyanin production as well as Spirulina growth, by autotrophic cultivation considering that autotrophic culti...
متن کاملEffect of diode laser and light-emitting diode (LED) activated bleaching with 35% hydrogen peroxide on microleakage of class-V composite restorations: An in vitro study
Introduction: Residual oxygen-free radicals of bleaching agents before composite restorations can increase microleakage in enamel and dentin margins, and also various bleaching techniques are being developed using light sources. The present study was conducted to compare the effect of diode laser bleaching and LED activated bleaching on the microleakage of composite restorations. Materials & M...
متن کاملThermal Pumping of Light-Emitting Diodes
The work presented here is a study of thermally enhanced injection in light-emitting diodes (LEDs). This effect, which we refer to as "thermal pumping", results from Peltier energy exchange from the lattice to charge carriers when current is injected into an LED. For an applied voltage V such that qV < (hw), where q is the electron charge and (hw) is the average emitted photon energy, thermal p...
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تاریخ انتشار 2017