Materials Literature
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The fatigue crack propagation behavior of pure magnesium single crystals has been investigated in laboratory air at room temperature. Two types of CT specimens with different notch orientations were prepared from the magnesium single crystal made by the Bridgeman technique. Fatigue crack propagation behaviors of each…
Accurate measurement of thrust from microthrusters is a significant technical challenge. We report significantly improved performance from our microthruster thrust stand which has now demonstrated 25nN thrust resolution and can carry a fully operational microthruster and power supply with up to 15kg total mass. Thrust…
Lithotripter pulses (∼7–10 μs) initiate the growth of cavitation bubbles, which collapse hundreds of microseconds later. Since the bubble growth‐collapse cycle trails passage of the pulse, and is ∼1000 times shorter than the pulse interval at clinically relevant firing rates, it is not expected that cavitation will af…
This paper presents the chemical and mechanical wearing of high speed steel and tungsten carbide tools by some tropical woods. In the first part of the experiment, weight losses of tool materials of JIS SKH51-A, JIS SKH51-H and JIS WC-12%Co after reacting with wood extracts of coconut, oil palm, teak, red meranti and…
Abstract — Crosslinked polyethylene (XLPE) has been used for ac power cable insulation up to 500 kV for many years. There is a tendency to use XLPE for dc power cable. However, the easy formation of space charge under dc electric field within XLPE is a major concern for such an application. Therefore, a better underst…
Bending is the predominant deformation mode in Nitinol medical devices and components. Many of these applications also impose cyclic bending loading conditions. The present study of rotary bend fatigue provides insight into the behaviour of Nitinol under zero mean-strain conditions. This investigation also gives a bet…
AbstrAct Purpose: Purpose of this paper was to study the main effects of the turning in the superficial integrity of the duplex stainless steel ASTM A890-Gr6A. Design/methodology/approach: The focus of the work was the finishing operations and a complete factorial planning was used, with 2 levels and 5 factors. The te…
In the cavities of unprecedentedly functionalised, spherical, porous capsules of the type {Pentagon}12{Linker}30 identical with [{(Mo)Mo5O21(H2O)6}12{Mo2O4(ligand)}30]n- reactions with the ligands -i.e. at the internal shell surfaces - can be performed, in the present case deliberate aquation/hydration and deprotonati…
In this study, we have investigated the reaction between (3-aminoethyl)amino-propyltrimethoxysilane (AEPTS) and a precipitated silica in organic solvents. Solid-state 29Si NMR and Karl Fischer titration have been used to produce useful information on the grafted silica samples. AEPTS was chosen in order to characteris…
We analyse the mesoscopic structure and structural fluctuations in simulated high-concentration hard sphere colloidal suspensions by means of calculations based on the void space. We show that remoteness, a quantity measuring the scale of spaces, is useful in studying crystallization, since ordering of the particles i…
Microfiltration membranes that can be composted after service were developed from biodegradable polyesters, poly(L-lactic acid) (PLLA) and poly(ε-caprolactone) (PCL). The membranes were formed via the thermally induced phase separation method. A 10 wt% PLLA solution in a mixed diluent of 1,4-dioxane and water (87:13 b…
Morphology modifiers can act in many different ways on the precipitating phase. Inhibitors can alter the solution chemistry and thereby change the supersaturation, they may adsorb onto the surface and block growth and agglomeration, they may alter the critical nucleus and affect nucleation or they may do a combination…
The ionic and electronic conduction of Gd 0.95 Ca 0.05 Nb O 4 has been determined with ac conductivity measurements and impedance spectroscopy in combination with transport number measurements using the open circuit voltage (electromotive force) of concentration cells. Depending on the reaction conditions, protons, ox…
The paper is divided in two parts. The first one recalls the necessary basis of ordered and disordered materials crystal-lography applied to carbons. The second part deals with the transformation of macromolecules (natural or industrial) to carbon and the eventual graphitization of the end-products. It is shown that t…
We discuss the approaches to preserve the high-reflectance aluminum mirror for the vacuum-ultraviolet spectral region. Single fluoride and oxide layers, a homogeneous multilayer, and hybrid multilayer solutions are put forward. Single fluoride and oxide materials have achieved reflectance above 90% at 193 nm. Multilay…
Porous electrodes were fabricated by applying anodic pulses of and duration to pure Nb in phosphate buffered saline solution (PBS), aiming at biomaterial applications. The porosity of the oxide could be controlled by the number of pulses. X-ray photoelectron spectroscopy analysis confirmed the oxide to be . The electr…
Fibre suspension flocculation was studied in a flow loop system, simulating the flow conditions in a modern paper machine headbox. The fibre suspensions after the headbox were accelerated by a secondary contraction, mimicking flow accelerations that may take place during forming. Fibre suspensions were studied using a…
The statistical damage model presented by the authors in the previous pa-per of this series is used to formulate analytical constitutive relations for the hardening and softening phases of two-dimensional lattices. A proper de-nition of the damage parameter for the softening is introduced. The results con rm that the…
The area of integrated optical circuits has been undergoing rapid development and will have huge potential in the future due to the important applications of fiber communication systems and optical interconnects. A significant challenge of optical circuits lies in increasing circuit density while miniaturizing the dev…
This paper is focused on the progress in the determination of water in glasses and melt inclusions with Raman spectroscopy. Using the presented "Comparator Technique" the water content of a sample is determined by simple comparison with a known standard. A calibration curve is not necessary. Furthermore, with this tec…