Search results for " Dio"

Porównanie efektywności katalizatorów hybrydowych z matrycą mikro- i nanoanatazu w procesie fotodegradacji 4-nitrofenolu w wodzie

2016

Zanieczyszczenia wód gruntowych i powierzchniowych są powodowane w dużej mierze przez pochodne fenolu, w szczególności 4-nitrofenolu (4NF). Jedną z obiecujących metod oczyszczania ścieków jest fotokatalityczna mineralizacja zawartych w nich fenoli, z wykorzystaniem półprzewodników, np. ditlenku tytanu (TiO2). Na szczególną uwagę zasługuje anataz, który w zależności od rozmiaru ziaren dostępny jest jako produkt mikro- i nanokrystaliczny. Fotokatalizatory hybrydowe otrzymuje się m.in. poprzez impregnację anatazu ftalocyjaninami. Dzięki temu proces fotoutleniania związków aromatycznych może zachodzić z większą szybkością. Celem badań było porównanie efektywności katalizatorów hybrydowych z mat…

Laboratorio di matematica in classe: due nuove macchine per problemi nel continuo e nel discreto

2013

In this work we will introduce two mathematical machines (originally invented by the authors) that can be useful in class during laboratorial activities. We decided to introduce them together because they appeared us complementary about the subtended contents, in fact one of them solves a discrete problem (diophantine equations) involving concepts as integers, divisibility, and in general discrete math, while the other machine (solving differential equations in a grapho-mechanical way) involves the complementary concepts of continuous math: curves, tangents, derivatives. In this paper we will just present the machines, deepening the ideas and the subtended mathematical contents, but we will…

Surface poling in lithium niobate waveguide creates efficient wavelength conversion

2004

Used with red or IR emitting laser diodes, nonlinear crystals for frequency doubling can result in a small blue emitting laser that is a viable alternative to gallium nitride-based laser diodes.

Electro-optical characterization of new classes of Silicon Carbide UV photodetectors

2014

In this paper, we present the fabrication process steps and the characterization of 4H-SiC vertical Schottky UV detectors, where interdigitated strips, acting as top metal contacts, have been realized in $\hbox{Ni}_{2}\hbox{Si}$ . These devices exploit the pinch-off surface effect. $I$ – $V$ and $C$ – $V$ characteristics, as functions of temperature, were measured in dark conditions. In addition, we have carried out responsivity measurements, for wavelengths ranging from 200 to 400 nm, at varying package temperature and applied reverse bias. A comparison among devices having different strip pitch sizes has been performed, thus finding out that the 10- $\mu\hbox{m}$ pitch class demonstrates …

Geographic Information System of Primary Carbon Deposit of Mangrove Forest in Merauke District, Indonesia

2020

Emission factors with increasing carbon dioxide (CO2) originating from various human activities are one of the causes of global climate change. The mangrove forest is a type of plant that has a great ability to absorb carbon in the atmosphere and store it in biomass through photosynthesis. Merauke Regency has 20 separate parts based on regional administration, but primary Mangrove forests are only found in ten regions (district). The results of research carried out using geographic information systems (GIS) in processing primary Mangrove forest data based on 2016 land cover map data in Merauke district, the area of primary mangrove forest reaches 184.402 ha, which is spread in various regio…

Prototyping and Characterization of 1.2KV SIC Schottky Diodes for TWTA Application: The Challenge to Meet the User Specification

2017

Rayleigh Equation Anomaloscope from Commercially Available LEDs

2012

Most precise classification of CVD (color vision deficits) can be provided by using anomaloscope. Today anomaloscopes are available, which can evaluate red-green (Rayleigh) and blue-green (Moreland) color defects.DOI: http://dx.doi.org/10.5755/j01.ms.18.2.1928

Surface Morphology of Single and Multi-Layer Silicon Nitride Dielectric Nano-Coatings on Silicon Dioxide and Polycrystalline Silicon

2019

Silicon nitride (Si3N4) in a form of single and multi-layer nanofilms is proposed to be used as a dielectric layer in nanocapacitors for operation in harsh environmental conditions. Characterization of surface morphology, roughness and chemical bonds of the Si3N4 coatings has an important role in production process as the surface morphology affects the contact surface with other components of the produced device. Si3N4 was synthesized by using low pressure chemical vapour deposition method and depositing single and multi-layer (3 – 5 layers) nanofilms on SiO2 and polycrystalline silicon (PolySi). The total thickness of the synthesized nanofilms was 20 – 60 nm. Surface morphology was investi…

“SmartGlass” Obstacles for Dynamic Inducing of Light Scattering in Vision Research Experiments

2017

We describe a technique that allows control of visual stimuli quality through the use of a setup with a polymer dispersed liquid crystal (PDLC) film positioned in the optical pathway of one or both human eyes. Nowadays, PDLC films allow alteration of the resolution and contrast limits of the transmitted light due to continuous change in the light scattering that is obtained by the application of an AC electrical field. In our experimental setup, the use of a wide-aperture up to area of 20 x 15 cm2 PDLC sheet is combined with a flat-screen PC display or with a modified display emission block without its interference filter unit and with an installed individually controllable colored light-em…

One-dimensional nanostructures of lead and lead dioxide for application in lead-acid batteries

2010

Fabrication of Pb and PbO2 nanostructures was undertaken with the aim of building low cost lead acid micro-batteries with high performance. Despite environmental problems and the relatively low specific energy in comparison with other galvanic generators, lead acid batteries are still extensively used in the field of energy accumulation, owing to a well known and reliable technology. Thus, it is of high technological interest to develop procedures for fabricating these devices at a micrometer scale or less. PbO2 nanowires were grown in different electrochemical deposition conditions leading to pure -PbO2, pure -PbO2 and  mixture [1-2]. Several parameters, like temperature, electrolyte…