Effects of Material Ratio, Fly Ash, and Citric Acid on Magnesium Oxysulfate Cement
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First-principles study of structural stability and elastic properties of MgPd3 and its hydride
Theoretical study of structural stability and elastic properties of α- and β-MgPd3 intermetallic compounds as well as their hydrides have been carried out based on density functional theory. The results indicate α-MgPd3 is more stable than β phase with increased stability in their hydrides. The calculated elastic cons…
Delivery of multipurpose prevention drug combinations from electrospun nanofibers using composite microarchitectures
BACKGROUND: Electrospun drug-eluting fabrics have enormous potential for the delivery of physicochemically diverse drugs in combination by controlling the underlying material chemistry and fabric microarchitecture. However, the rationale for formulating drugs at high drug loading in the same or separate fibers is unkn…
Enzymatic preparation of nanocrystalline and microcrystalline cellulose
Traditional cellulose nanocrystal (CNC) production methods use harsh chemicals, are energetically expensive, and result in a hydrophilic sulfate surface chemistry with limited utility. Enzymatic production of CNCs is a less expensive alternative production method that eliminates the need for harsh chemicals and requir…
Enhanced photoresponse of Cu2O/ZnO heterojunction with piezo-modulated interface engineering
The ability to arbitrarily regulate semiconductor interfaces provides the most effective way to modulate the performance of optoelectronic devices. However, less work has been reported on piezo-modulated interface engineering in all-oxide systems. In this paper, an enhanced photoresponse of an all-oxide Cu 2 O/ZnO het…
The influence of repetitive square wave voltage parameters on enameled wire endurance
The dependence of endurance test results on repetitive square wave voltage waveform parameters is investigated in this paper focusing on crossed pair specimens made of polyamide-imide enameled wires. Endurance tests carried out on crossed pairs above partial discharge inception voltage using both sinusoidal and square…
Films and edible coatings containing antioxidants - a review
The incorporation of natural antioxidants into films and edible coatings can modify their structure, improving their functionality and applicability in foods, such as in fresh-cut fruits. This paper reviews the more recent literature on the incorporation of antioxidants from several sources into films and edible coati…
Mechanical and Tribological Properties of Metal Matrix Composites Reinforced with Short Carbon Fibre
Artykuł stanowi podsumowanie dotychczasowych badań na temat wpływu krótkich włókien węglowych na poprawę właściwości stopu AlMglO. W prezentowanej pracy przedstawiono wyniki badań właściwości mechanicznych i trybologicznych kompozytów metalowych. Kompozyty zostały wytworzone dwoma metodami: poprzez odlewanie grawitacy…
Interaction of Non-Metallic Inclusion Particles with Advancing Solidification Front
Abstract This work deals the phenomenon interaction of crystallization front on the particles of non-metallic precipitates. The behavior of a single particle in the vicinity of horizontal and vertical front was analyzed. The forces acting on the particle were characterized and the equilibrium condition formulated, fro…
Characteristic of Carbon Nanotubes Modified with Cobalt, Copper and Bromine
Abstract The paper presents results of studies on carbon nanotubes - as received, after cleaning and also after modification. Functional groups as well as metal nanoparticles have been attached, originating from cobalt sulphate, copper acetate and a mixture of hydrogen bromide and bromide. The surface studies on an at…
Mechanism and Kinetics of Precipitation Process in Selected Copper Alloys
Wymagane cechy użytkowe których oczekuje się od stopów miedzi wywierają zasadniczy wpływ na ich technologiczny proces wytwarzania. Wynika stąd konieczność rozeznania zakresu zmian własności użytkowych wynikających z zastosowanego wariantu obróbki cieplnej i plastycznej. Stopy miedzi CuTi4, CuFe2, CuCr0.7 i CuNi2Sil po…
Thin Wall Ductile Iron Castings as Substitutes for Aluminium Alloy Castings
W pracy omówiono przyczyny aktualnego trendu zastępowania odlewów z żeliwa przez odlewy ze stopów aluminium. W szczególności wykazano, że możliwe jest wytworzenie odlewów cienkościennych (wahacze, wsporniki, wirniki), wykonanych z żeliwa sferoidalnego bez zabieleń, niedolewów i niespawów oraz posiadających wskaźnik wy…
SUSCEPTOBILITY TO THERMAL FATIGUE OF CLOSED DIE HOT FORGING DIES
Hot forging dies providing high productive performance reduce production costs. The lifetime of the dies is expressed by the number of forgings (production cycle) produced before being rejected by the presence of a failure mechanism, associated with unacceptable dimensions and or geometry of the end product or even br…
CHARACTERIZATION OF NEW TOOL STEEL FOR ALUMINUM EXTRUSION DIES
Aluminum extrusion dies are an important segment of application on industrial tools steels, which are manufactured in steels based on AISI H13 steel. The main properties of steels applied to extrusion dies are: wear resistance, impact resistance and tempering resistance. The present work discusses the characteristics…
Forming the Structure of Composite Metallic Foams
W Zakładzie Inżynierii Materiałów Okrętowych Akademii Morskiej w Szczecinie prowadzono badania nad technologią kompozytów metalowych, a w szczególności kompozytowych pian aluminiowych stabilizowanych cząstkami ceramicznymi. Technologią pian pozwalającą na wydajne, tanie a także elastyczne, w zakresie zróżnicowania bud…
SÍNTESE DO ESPINÉLIO Al 2 MnO4 VIA REDUÇÃO COM H2
Nanostructured oxides with interesting magnetic properties, such as the spinel Al2 MnO4 , can be synthesized through thermal decomposition of nitrate solution followed by thermal treatment under a reducing atmosphere. The present work can be understood as a study of the synthesis of Al2 MnO4 samples based on the H2 re…
Combined effect of waste colemanite and silica fume on properties of cement mortar
In this study, effect of silica fume (SF) waste colemanite on properties of cement mortar was investigated. The parameters studied were initial and final setting times, specific gravity, specific surface, water demand, flow ability, volume expansion, compressive strength, and freeze-thaw durability. A number of mixtur…
Diffusivities and kinetics of short-range and long-range orderings in Ni-Fe permalloys
The microscopic model of atomic diffusion is considered to describe the short-range order relaxation kinetics within the f.c.c.-Ni-Fe Permalloys. The model takes into account both the discrete and anisotropic characters of atomic jumps within the long-range field of concentration heterogeneities of the interacting ato…
ON OPTIMIZATION OF STEELMAKING IN ELECTRIC ARC FURNACE AND ITS LADLE TREATMENT IN LADLE-FURNACE
Steelmaking in arc 150-ton electric furnace using iron-rich pellets is considered. It is shown that the melting results are determined by the conditions of the simultaneous processes of the pellet melting and the melt oxidation refining. At that, it is important to monitor both the level of the bath thermal supply bat…
CONDUCTION SENSOR OF LIQUID FLOWING IN DIELECTRIC PIPE
A fundamentally new design of the contactless inductive sensor for the conduction control of the liquids applied in the chemical, oil-extracting, food, and other industries is offered. The sensor magnetic field is studied using modeling software system Elcut 5.6 Professional. In the course of the investigations, the i…