Materials Literature
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A bright green light emitting phosphor has been prepared at low temperature through gel combustion synthesis using zinc nitrate, manganese acetate, urea in a silica gel matrix. The structure and morphology of the phosphors using scanning electron microscopy along with thermogravimetric analysis/differential thermal an…
We demonstrate and discuss the performance of a flexible micro thermoelectric generator with Ni/Cu thermocouples in a SU-8 mold. The fabricated devices generate up to 20.68plusmn0.32 muWcm-2K-2for the case of vanishing thermal interface resistance (K=0). The generator keeps functionality when bent to curvatures with r…
Undoped, 10 wt% Al and 10 wt% Mn doped ZnO thin films were deposited on a glass substrate by sol-gel dip coating. Al ions played an important role in improvement of the c-axis orientation, while Mn ions inhibited the growth along c-axis. The average grain size decreased when doping ZnO with Al and Mn. The smallest ave…
The two main issues in pulse-width modulated ASD motors namely: stress concentration at slot exits and at junctions between stress grading and corona protection materials, and winding insulation aging due to partial discharge and/or dielectric heating, often intensified between turns as well as across the main-wall of…
We present here the results of the substitution of 3-bromopropyltriethoxysilane-grafted mesoporous SBA15 (pore size 7.6 nm) with a series of diamines, CH3NH(CH2)nNHCH3 (C2DA, C3DA and C6DA for n = 2, 3 and 6, respectively) or NH2(CH2)nNH2 (C4DA and C5DA for n = 4 and 5, respectively). The outcome of the reactions was…
One-step low-temperature electrodeposition has been employed to fabricate ordered polycrystalline CdO nanowire arrays using anodic alumina membrane (AAM) templates by reduction of dissolved oxygen in presence of Cd2+ in the electrolyte. The CdO nanowires are uniform, and their length depends on the electrodeposition t…
Shape memory characteristics of Ti-18 mol%Nb alloys containing 3, 4, 5 and 6 mol%Cu (termed Ti18Nb3Cu, Ti18Nb4Cu, Ti18Nb5Cu and Ti18Nb6Cu, respectively) were investigated and effects of Cu addition on shape memory behavior was clarified. The alloys fabricated by Ar arc-melting method were cold-rolled with 98% reductio…
The threat and consequences of landmines have led to a multitude of alternative research activities in the field of demining. While mine sensor-focused research has been intensive, there has been relatively less attention given to the problem of automating the detection and removal procedure. Understandably, autonomou…
Four tetranuclear manganese(III) complexes containing phosphonate ligands (RPO32−, R = Me, Et and n-Bu), [Mn4O2(MePO3)2(O2CMe)4(bpy)2]·4MeCOOH (1), [Mn4O2(EtPO3)2(O2CMe)4(bpy)2]·7H2O (2), [Mn4O2(n-BuPO3)2(O2CMe)4(bpy)2]·4H2O·(COOH)2 (3) and [Mn4O2(MePO3)2(O2CPh)4(phen)2]·4PhCOOH·2MeCN (4), have been synthesized and ch…
Extruded pure magnesium and AZ31B alloy were compressed parallel and vertical to extrusion direction. Deformation behavior was investigated in monotonous compression by acoustic emission (AE). Anelastic recovery behavior was observed in cyclic compression-quick unloading-recovery process. AE method was applied in each…
Using both direct mathematical analysis and numerical modeling based on the predictions by Jones [1] it is shown that if the director in a liquid crystal cell is in a plane which lies at 45 degrees to the incident polarization, then, for normally incident light, the transmission signal which conserves polarization wil…
A micro solid oxide fuel cell (SOFC) stack with two series-wound single fuel cells was fabricated and operated successfully under single-chamber conditions. In this stack, the single cells were based on Ni/yttria-stabilized zirconia (YSZ) anode-supported YSZ membrane and were arranged with an anode-facing-cathode conf…
Interactions of fexofenadine (Fexo) with cyclodextrins (CDs: alpha- beta-, gamma-, and HP-beta-CD) were investigated by several techniques including phase solubility, differential scanning calorimetry (DSC), X-ray powder diffractometry (XRPD), (1)H-nuclear magnetic resonance ((1)H-NMR) and molecular mechanical modelin…
A negative-type photosensitive polyimide (PSPI) based on a semi-alicyclic poly(amic acid) (PAA) and a photobase generator (PBG), {[(4,5-dimethoxy-2-nitrobenzyl)oxy]carbonyl}2,6-dimethyl piperidine (DNCDP) has been developed. PAA was readily prepared from cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA) and 4,4'-…
Finding the ground states of identical particles packed on spheres has relevance for stabilizing emulsions and has a venerable history in the literature of theoretical physics and mathematics. Theory and experiment have confirmed that defects such as disclinations and dislocations are an intrinsic part of the ground s…
水素脆性の機構として今までに提案されている主な理論の概要をまとめた．基本的な扱いは脆性破壊あるいは延性破壊とみなすかの二つに大別される．脆性破壊としては析出水素の内圧理論，き裂表面エネルギー低下理論，格子脆化理論があり，延性破壊としては水素助長割れ理論，局所塑性助長理論，吸着誘起塑性理論，自己触媒理論がある．また応力腐食割れと水素脆性との関係についても触れた．とくにそれぞれの理論の根拠になっている実験と理論の前提となっている仮定に注意した．
Energy transfer (ET) and heat generation processes in Yb(3+)/Tm(3+)-co-doped low-silica calcium-aluminosilicate glasses were investigated using thermal lens and photoluminescence measurements. Stepwise ET processes from Yb(3+) to Tm(3+), with excitation at 0.976 mum, produced efficient emission in the mid-infrared ran…
SnO2 thin film was prepared from a SnF2-HF aqueous solution with the addition of H3BO3 aqueous solution by the Liquid Phase Deposition (LPD) method. We focused on the construction of the continuous deposition system and the control of the deposition rate. Parent solution containing SnF2-HF was intermittently added to…
A new field of chemistry has been started with the preparation of highly unstable SCl4 in 18731 and it has developed rapidly in the last four decades. The structure of SCl4 is trigonal bipyramidal (TBP) with a lone pair orbital of S (n(S)) located at the equatorial position. Three Cl, S, and Cl atom...
A solar TPV generator development and characterization are presented. A double stage sunlight concentrator ensures 4600x concentration ratio. TPV modules based on tungsten emitters and GaSb cells were designed, fabricated and tested at indoor and outdoor conditions. The performance of tungsten emitter under concentrat…