REVIEW OF PROPERTIES, COMPOSITION AND DEFECTS OF DIFFERENT GLASSES WITH POTENTIAL USE FOR GAS HYDROGEN STORAGE SYSTEMS

The article reviews the research findings available on different types of glasses that presents potential use for high pressure gas hydrogen storage systems. An overview of the mechanical properties of different glasses, the influence of main constituents and the impact of defects to the strength of glass was presented. As part of this research, it can be concluded that the glass gets a significant improvement of tensile strength by reducing its dimensions to fibre sizes or capillaries due to reduced probability of defects presence.

IMPORTANCE OF DIFFUSION PUMPING WHILE PRODUCING AMORPHOUS AND PARTIALLY CRYSTALLISED MATERIALS

It can be state that 1960 was the year when amorphous materials era began. 1989 was the year when bulk materials amorphous were first produced. Since then researchers around the World try to improve or find new correlations according to this group of materials. Sometimes instead of obtaining amorphous materials produced sample may be partially crystallised. During last research, ingots of two different alloys discussed in this work were produced with and without use of diffusion pump. Samples produced in injection method were done under the same condition for both cases of ingots. Then samples were subjected to structure analysis with the use of x-rays and were checked according to magnetic properties. Obtained results are compatible with expectations, however by meet one give promising possibility of further research.

THE EFFECT OF LENSES AND LIGHT ON THE GREEN PLANT IMAGING USING MODIFYING CONFOCAL MICROSCOPE

Image processing becomes one of the most important demands, requisites and exigencies in the 20th century, because of its usages in many and different parts of habitats and customs, so the enhanced image represents the main issue for scientists and researchers, where little methods, devices and programs were existing. According to this, our study was significantly concerned with the image processing; namely, the living cell imaged using different lenses on the confocal microscopy. The microscope was designed very well to give perfect resolution imaged taken from different situation (angles) and different lenses with the magnification (X = 40, 100 and 160) and various light sources (white light, laser red, laser blue, and laser green). From the results conducted and achieved it's clear that the lens with magnification 100 and near wavelength light color gives more information about the living cell (object). The histograms confirm vigorously these results, so this could solve and enhanced the resolution image in multi disciplines, scopes and avenues.

HISTORICAL AND EDUCATIONAL ASPECTS OF DISCOVERIES AND INVENTIONS THAT REVOLUTIONIZED MANKIND

This article presents discoveries and inventions from different periods of mankind, which played an important role in social and technological evolution. Thus, from the period of the Ancient World (prehistory - 400 AD), we present: the appearance of stone tools (which occurred in East Africa and belongs to the first hominids); pottery (appeared in 10500 BC); the development of metallurgy (began in the Middle East, around 6500 BC); the invention of the ox-drawn plow (which occurred around 4000 BC); the construction of the first pyramid in Egypt (2600 BC); the development of iron processing (as part of the development of metallurgy, it occurred around 1400 BC); modernization of papermaking technology (attributed to Tsai Lun, China, around 105 AD); Another historical period that we analyzed in terms of discoveries and innovations that revolutionized humanity was the Middle Ages (400 - 1500). Thus, from this period we presented the following discoveries and inventions: the discovery of the number zero (occurred in 520 and belongs to Indian mathematicians); woodcut printing (appeared in sixth century China); the first printed newspaper (year 700); the development of algebra (it belongs to the Greek mathematician Diophantos, 3rd century AD); gunpowder (it was discovered around 850); the establishment of the University of Bologna (made in 1088); The last period approached was the current one. From this period we presented the following discoveries: magnetism - a new form of electricity; devices controlled only by hand gestures.

HOT COMPRESSION DEFORMATION BEHAVIOR AND CONSTITUTIVE ANALYSIS OF EXTRUDED MAGNESIUM-BISMUTH ALLOYS

The isothermal compression experiments of Mg-2Bi alloys were carried out under different temperature and strain rate by Gleeble 3500D thermal simulation test machine. The rheological stress variation law of the Mg-2Bi alloy was analysed under 200-350oC and 0.001-1.0 s-1. The results present that the peak stress enhances and the dynamic recrystallization grain size reduces with the decline of deformation temperature and the improvement of strain rate during isothermal compression of the Mg-2Bi alloy. In addition, the activation energy for alloy deformation is 130.03 kJ/mol. The softening mechanism of the Mg-2Bi alloy is mainly twin and dynamic recrystallization under a low temperature (200oC) condition. While at a higher temperature of 350oC, the softening mechanism changes to single dynamic recrystallization.

MICROSTRUCTURAL AND PHYSICOCHEMICAL PROPERTIES OF SOME ALUMINUM COOKING TOOLS OBTAINED BY ARTISANAL RECYCLING

Recycling metals waste is one of the ways to recover this waste, but also to preserve mining resources and fight against pollution. Aluminum is one of the most recycled metals due to its relatively low melting temperature, high conductivity, ductility, malleability and its high resistance to corrosion. In Togo, as in many West African countries, aluminum wastes are collected, melted and molded in artisanal way to make new objects for domestic use. The aim of this work is to investigate the process of artisanal aluminum recycling and use several modern techniques of characterization in order to improve thereafter products and manufacturing process. Two types of samples were subjected to a series of physicochemical analysis. One from an old aluminum pot (sample (a)) and the other cut from newly pot obtained after artisanal manufacturing (sample (b)). The measurement of the temperature inside the crucible during scarp aluminum melting operation reveals three temperatures ranges with a melting point around 750℃. Atomic absorption spectrometry (AAS) indicates that the two samples contain mostly aluminum, zinc, copper, magnesium and some traces of lead. Optical microscopy observations show that the alpha aluminum matrix was the most abundant phase with 80 to 90% of the observed area and some inclusions randomly dispersed. X- ray diffraction (XRD) confirms the presence of lines characteristic of alpha aluminum and bohemite (γ-AlOOH).