Search results for "Fabric"
showing 10 items of 545 documents
Aluminum Plasmonics: Fabrication and Characterization of Broadly Tunable Plasmonic Surfaces for Plasmon Molecule Strong-Coupling and Fluorescence Enh…
2018
Our work based on previous studies [1, 2] confirms, that simple aluminum nanostructures can be utilized as effective plasmonic resonators over a broad range of frequencies and wavelengths. The nanostructured surfaces, fabricated by electron-beam lithography demonstrated relatively narrow-band resonances and are suitable for various plasmonic applications ranging from metal enhanced fluorescence to strong-coupling [1, 2, 3, 4, 5] experiments. We represent data for molecule-plasmon coupling near the strong coupling limit and demonstrate that these aluminum structures do act as fluorescence increasing substrates. In this work, we used two different types of dyes. We studied the narrow band j-a…
Nanostructure Formation on ZnSe Crystal Surface by Electrochemical Etching
2021
The article describes a simple method for nanostructuring the surface of monocrystalline zinc selenide. It is shown that the traditional electrochemical etching of n-ZnSe (111) samples in a concentrated solution of nitric acid leads to the appearance of massive etching pits and small pores on the surface. The dynamics of the process and stages of crystal dissolution has been studied. It is assumed that the porous zinc selenide obtained in this way can be used in optoelectronic structures, as well as as buffer layers for growing zinc oxide.
Deposition of Cu Nanoparticles on the Surface of Metallic Aluminum
2012
Deposition of Cu particles by electrolysis at constant electrode potential and by internal electrolysis methods was investigated. The composition of deposited material was confirmed by optical and scanning electron microscope methods. Combination of electrolysis at constant electrode potential with internal electrolysis method was found most effective for fabrication of nanoparticle arrays. Single crystalline Cu particles are fabricated by internal electrolysis, while polycrystalline ones obtained by combined chronopotentiometric and internal electrolysis methods. The formation mechanism of Cu nanoparticles is described.
Classification et chronologie de bas fourneaux de réduction du fer à usage unique au sud-ouest du Niger
2016
In southwestern Niger, near Niamey, several thousand single-use bloomery furnaces have been mapped and identified. The archaeological study of approximately 30 furnaces and their slag reveals the existence of four methods for iron smelting: three types of pit furnace and one slag-tapping type. The slag pit furnaces are clearly differentiated by the form and volume of their pits. All slag-tapping furnaces drain off slag through small openings. The slag is tapped either vertically or laterally. According to radiocarbon dates, the smelting activity developed in the 2 nd century AD and intensified through to the 14 th century. It continued to evolve until the middle of the 20 th century. The lo…
Transfer of plasmid DNA into cells with microelectroporation arrays on a chip
2000
The possibility to transfer pure DNA into bacterial cells forms the basis for the genetic engineering of the cell. Electroporation is a powerful and easy technique to introduce plasmid DNA into cells. Its drawback for use with high-throughput approaches is that with standard electroporation chambers the reactions have to carried out one after the other and the electroporation cuvettes are expensive. To obtain the possibility of high-throughput electroporation reactions Escherichia coli cells were electroinjected in parallel with different plasmids in reactions as small as 100 nl on a microstructured array of electrodes, forming hundred separate electroporation units on a chip of a square in…
Planificación de la producción en un entorno multifábrica [Dataset]
2018
Las cadenas de suministro en las que se insertan los procesos de producción son cada vez más complejas. Las empresas que cuentan con fábricas en diferentes localizaciones reparten entre ellas la fabricación de piezas y componentes. E incluso llegan a externalizar el montaje de los productos finales, enviando sus componentes a otras plantas para su montaje final. Surgen, por tanto, nuevos problemas de planificación y programación de la producción inherentes a esta forma de producción descentralizada. Se ha de asignar la producción de cada planta, programar su producción y, llegados el caso, planificar los envíos a la planta en la que se realizará el montaje. Si bien es cierto que cada uno de…
Planificación de la producción en un entorno multifábrica
2018
Las cadenas de suministro en las que se insertan los procesos de producción son cada vez más complejas. Las empresas que cuentan con fábricas en diferentes localizaciones reparten entre ellas la fabricación de piezas y componentes. E incluso llegan a externalizar el montaje de los productos finales, enviando sus componentes a otras plantas para su montaje final. Surgen, por tanto, nuevos problemas de planificación y programación de la producción inherentes a esta forma de producción descentralizada. Se ha de asignar la producción de cada planta, programar su producción y, llegados el caso, planificar los envíos a la planta en la que se realizará el montaje. Si bien es cierto que cada uno de…
Planificación de la producción en un entorno multifábrica
2018
Las cadenas de suministro en las que se insertan los procesos de producción son cada vez más complejas. Las empresas que cuentan con fábricas en diferentes localizaciones reparten entre ellas la fabricación de piezas y componentes. E incluso llegan a externalizar el montaje de los productos finales, enviando sus componentes a otras plantas para su montaje final. Surgen, por tanto, nuevos problemas de planificación y programación de la producción inherentes a esta forma de producción descentralizada. Se ha de asignar la producción de cada planta, programar su producción y, llegados el caso, planificar los envíos a la planta en la que se realizará el montaje. Si bien es cierto que cada uno de…
Premolars restored with posts of different materials: fatigue analysis
2011
Previous works studied the effect of the material and the dimensions of the post on the biomechanical performance (fracture strength and stress distribution) of restored teeth, under static loads. The aim of this work was to study the effect of the post material (glass fibre and stainless steel) on restored teeth, which have the final crown, under dynamic conditions. The use of a biomechanical model, including a fatigue analysis from FEA, is presented as a powerful method to study the effect of the material of the intraradicular post. The inclusion of the fatigue analysis allows for a more realistic study that takes into account the dynamic nature of masticatory forces. At the same time, th…
Influence of material and diameter of pre-fabricated posts on maxillary central incisors restored with crown.
2009
Summary Numerous research works have studied the effect of post-design parameters on the mechanical behaviour of restored teeth without reaching any clear conclusions. Previous works by the authors ascertained the effect of material and post-dimensions for non-crowned restored teeth. The aim of this work was to study the effect of post-material and diameter for crowned teeth. First, an experimental fracture strength test was performed on eighteen extracted human maxillary central incisors. Teeth were decoronated, treated endodontically and restored (nine with glass fibre posts and nine with stainless steel posts). Several post-diameters were used. The final crown restoration was carried ou…