Materials Literature
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Graphane is a semiconductor with an energy gap, obtained from hydrogenation of the two-dimensional grapheme sheet. Together with the two-dimensional geometry, unique transport features of graphene, and possibility of doping graphane, p and n regions can be defined so that p-n junctions become feasible with small rever…
Study was carried out to develop a composite material from agro waste consisting of sawdust and palm kernel shell and to determine its physical and mechanical properties. The sawdust / palm kernel shell compositions by weight were in the ratios of 100: 0, 90: 10, 80: 20, 70: 30, 60: 40 and 50:50. Urea formaldehyde was…
Perovskite-type PbTiO3-PbZrO3-Bi(Zn0.5Ti0.5)O3 ternary solid solution ceramics were synthesized by conventional solid state reaction method, their structure, dielectric, ferroelectric and piezoelectric properties were investigated. It was found a high piezoelectric and ferroelectric response around the composition of…
This study concerns the implementation and improvement of a system that applies ultrasound technology to vegetable tanning floats. The system is versatile and requires no major modifications or investment expense for tanneries. In particular, the study investigated grain fineness and fixation of tannins in relation to…
We have synthesized Ba 1-x La x Fe 12 O 19 (0 x 0.4) and BaFe 12-y Nd y O 19 (0 y 4) samples in ammonium nitrate melt and nitric acid. The effects of La and Nd doping on the microstructure and magnetic properties of BaFe 12 O 19 were investigated. The highest coercive field was obtained for the sample having La conten…
In this study, we have investigated the microstructure and magnetic entropy change of annealed LaFe 11.0 Co 0.8 (Si 0.4 Al 0.6 ) 1.2 alloy in a form of bulk samples and melt-spun ribbons. The bulk samples were annealed at 1323 K for 20 and 49 days and the maximum values of the magnetic entropy change |S M | obtained a…
The present paper reports a crystal-chemical study of minerals belonging to the proustite-pyrargyrite group by evaluating 32 natural samples of proustite and 27 samples of pyrargyrite from different localities that have variable chemical compositions. The unit-cell parameters were modeled as a function of the Sb conte…
A new Eunotia species, E. charliereimeri, is described from Bear Meadows Bog near State College, Pennsylvania. Bear Meadows is an open, montane, nutrient-poor fen that is about 1.6 km long and 0.5 km wide with its open wetlands dominated by Sphagnum, sedges, swamp laurel, blueberry, sundews, Rhododendron spp., alder,…
This paper presents a 2-axis scanning piezoelectric micromirror with zero initial tilt and no lateral shift during scanning. The piezoelectric material is a sol-gel PZT with a Zr/Ti ratio of 53/47. The unimorph PZT actuation beams consist of Pt/Ti/PZT/Pt/Ti/SiO2 thin-film layers, which are released via undercutting th…
Abstract: We show the potential of the nanosilicon structure of the frustules of a typical diatom, Cymatopleura sp., as a new vehicle for drugs. The basic diatom nanostructure is a lattice of SiO 2 , and computerized methods in a dock project have identified the most likely and the best drug types to load into such a…
Abstract Downhole scale deposition in the producing strings and wellbores is becoming a serious problem for many oil operating companies, especially when dealing with horizontal wells. For those companies that are using water flood to maintain the reservoir pressure, the problem will be greater as the scale is often c…
Dramatic effective mass reduction driven by a strong potential of competing periodicity, Monney, C., Schwier, E. F., Garnier, M. G., Battaglia, C., Mariotti, N., Didiot, C., Cercellier, H., Marcus, J., Berger, H., Titov, A. N., Beck, H., Aebi, P.
Abstract Small mass impacts pose a threat to modern lightweight materials even at low velocities. In this study we describe a test method with a suitable setup to access the materials impact response to masses below 500 g and velocities up to 20 m/s. The setup uses a highspeed camera and adapted semi-automatic image p…
High strength sheet steels for automobile are seriously compromised by hydrogen embrittlement. This issue has been continuously studied, but the field of interest, which lies between microstructural characteristics and hydrogen behavior with hydrogen charging, has not yet been thoroughly investigated. This study was d…
We measured time-resolved spectra and emission decay times under pulsed X-ray and synchrotron excitation in alkali-earth fluorides doped with Pr 3+ ions.Two fast decay components were found in the emission spectra of BaF2-Pr 3+ and SrF2-Pr 3+ .These were 4 ns and 21 ns in BaF2-Pr 3+ and 8 and 24 ns in SrF2-Pr 3+ .The…
The red emitting Y2O2S:Eu3+,TiIV (or ZrIV, xEu: 0.01, xTi/Zr: 0.003/0.015/0.03) materials were prepared with a flux method. According to X-ray powder diffraction, the materials have the hexagonal crystal structure. The UV excited (λexc: 250 nm) emission maximum was observed at 628 nm due to the 5D0→7F2 transition of E…
Refining of bleached hardwood pulps and bleached softwood pulps having different counter-ions to the charged groups within the fibres was studied. The results show that an energy reduction of 50% for the hardwood pulps and 20% for the softwood pulp can be achieved if the fibres are converted into the Na+-form prior to…
Emission and excitation spectra of CaF 2 , SrF 2 , BaF 2 doped by PrF 3 were measured in vacuum ultraviolet region at 11 K. Emission spectra of several 5d-4f bands of CaF 2 and BaF 2 show evident vibronic structure with apparent line separated by 400 cm −1 from the main zero phonon line. No such structure was observed…
We introduced 1.1 at. % of Mn ions into Ge thin films in order to explore the ferromagnetism in Mn implanted Ge. Rapid thermal anneal (RTA) was applied after the implantation to recrystallize the Ge and enhance the incorporation of Mn ions into the Ge lattice. A maximum saturation moment of 0.7 μB/Mn at 5 K was reache…
The aim of the present work is to record and compare long-term kinetic curves of the hydrolytic degradation of polymer systems: bacterial poly-3-hydroxybutyrate (POB), its copolymer with hydroxyvalerate, and also a composite mixture of POB and polylactide (PLA). To monitor the degree of hydrolytic degradation, use was…