Materials Literature
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In this study, the MOCVD grown InGaP/InGaAs/Ge triple-junction (3-J) solar cell incorporated with the InGaAs/GaAs quantum dots (QDs) layers in the middle cell to achieve 33.5% conversion efficiency () under one-sun AM1.5 G illumination is demonstrated. Optical reflective spectrum, dark and photo current-voltage (I-V)…
The ignition temperature for a material is not clearly defined throughout the fire-research community. To search for the ignition temperature of for example wood would give you different answers from different sources. This is due to different methods of calculations and measurements. In this report experimental test,…
High demand for lower noise generation in the CPAP device industries necessitates the need to have a computational modelling for obtaining in-depth understanding of internal aerodynamic flows and aero-acoustic characteristics that can be used during the product development process. In this thesis, a comprehensive nume…
Cu2ZnSnS4 is a promising photovoltaic absorber containing earth abundant elements. Using a two stage process, low temperature reactive co-sputtering followed by heat treatment, we have previously achieved a 7.9% efficient solar cell. Because the sputtered precursors contain non-equilibrium phases with unusual crystal…
Знайдено параметри раціонального використання горизонтальних ферм металевих циліндричних сітчастих покриттів. Враховано зміну стріли підйому, виконання умов граничних станів і чутливість до втрати стійкості. Отримано характерні закономірності роботи уразливих ділянок покриттів. Наведено особливості критичного деформув…
Résumé : Le développement des matériaux composites et leur utilisation dans le domaine du génie civil ont fait l’objet d’une recherche extensive sur le renforcement des structures en béton armé. Dans ce contexte, les études sur la compréhension du comportement structural des tubes en matériaux composites (Polymère ren…
Biomineralized materials have the ability to employ high volume fraction of modest and brittle materials and still exhibit surprising mechanical performance. Decoding the structure-function relationship of these materials is a challenging task that requires knowledge about the actual loading and environmental conditio…
Single-crystalline α-Fe2O3 nanorings (short nanotubes) and nanotubes were synthesized by a hydrothermal method. High-resolution transmission electron microscope and selected-area electron diffraction confirm that the axial directions of both nanorings and nanotubes are parallel to the crystalline c-axis. What is intri…
International audience
Diplomova prace se zabýva testovanim řezne geometrie nastrojů, vhodných pro obraběni neželezných materialu. Prvni cast je zaměřena na rozděleni polymeru a charakteristiku obraběneho materialu. Nasledně jsou stanovene řezne podminky pro vybrane nastroje. Dale nasleduje prakticka cast, ve ktere je proveden test vybranýc…
Polyvinyl alcohol (PVA) electrospun nanofibers containing Ag nanoparticles (NPs) have been deposited on glass substrates. The aim of the work was to test the feasibility of this approach for the detection of biogenic amines by using either the Ag localized surface plasmon resonance quenching caused by the adsorption o…
International audience
Metamaterials display unusual electromagnetic properties, such as, a negative effective permeability and negative effective permittivity. This has sparked much interest due to possibility of negative refraction which was later confirmed by experiments. The ability of magnetically coupled resonant circuits to display a…
Phosphorus (P) is an important factor in the eutrophication of freshwater, and watershed sources include effluent discharges and the landscape. Poultry litter applied to the landscape can be a potential source of P, which is dependent on rainfall, runoff and dissolution. Chitosan, the deacetylated form of the biopolym…
In hot rolled steel strip production the processed material are after the cooling section coiled into coils. Coils do normally weigh around 20 tons with a diameter of 2 m and heights equal to the strip width e.g. 0.8-1.4m. When processing HSLA (High Strength Low Alloy) steel grades the initial/coiling temperature is a…
In this study PHBV nanofibrillar structures were fabricated from different concentrations of PHBV solutions (10%, 13% and 15% (w/v)) by electrospinning and electrospinning parameters were optimized. Nanofibrillar structures with the most smooth and homogeneous morfologies were obtained at 10% (w/v) PHBV concentration.…
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As a result of the latest trends in the automotive industry that have put stringent requirements on the fuel consumption and exhaust gas emission, the engine research has been directed towards optimization of the combustion process and application of the variety of cleaner fuels. In that context the use of natural gas…
تنتشر الترب الغضارية في مناطق متعددة من سورية ، و بسبب بعض خواصها السلبية يصبح أمر تحسينها ملحاً أكثر فأكثر. إن تحسين التربة الغضارية باستخدام الإضافات المنرالية قد أثبت بشكل جيد في الدراسات السابقة، بينما كانت الدراسات التي أجريت على التحسين باستخدام البوزولانا الطبيعية و الكلس قليلة. تم اختبار إضافات الكلس , البوزول…
The initial procedure of the development of engineered tissues is cell seeding into three-dimensional polymer scaffolds. However, it is hard to make the cells invade into scaffold due to the characteristic of pore and material. Electrospun poly (L-lactic acid) scaffold and flow perfusion system were used to overcome t…