Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
In our study, shape descriptors were calculated for specimens from the diatom genus Asterionella, using the method of arc lengths and tangent angles in Fourier analysis. Asterionella species are character-poor, populations being distinguished mostly by subtle shape differences. Fourier analysis has been used in the pa…
Sicherite, TlAg 2 (As,Sb) 3 S 6 , is a new mineral species from the famous sulfosalt locality at Lengenbach, Binntal, Switzerland. It occurs in small cavities in a dolomitic rock of Triassic age, associated with abundant realgar, and various other sulfosalts, mainly Tl-bearing species such as hutchinsonite, hatchite,…
Teflon® FEP (fluorinated ethylene propylene) surfaces on the Hubble Space Telescope (HST) have experienced significant degradation in mechanical properties during nearly ten years of exposure in the low Earth orbit environment. This paper describes results of mechanical properties testing of Teflon® FEP materials expo…
The crystal structures of two kupletskite [K 2 NaMn 7 Ti 2 Si 8 O 26 (OH) 4 F] polytypes, (1) triclinic, space group P 1, and (2) monoclinic, space group C 2/ c , from nepheline syenite pegmatites of the Lovozero massif, Russia, have been determined. The two structures differ in the slacking sequence of an identical H…
Equations of nonlinear acoustics are derived from the micromechanical representation of a granular medium as a system of elastically interacting particles possessing translational and rotational degrees of freedom. The structure of the equations is invariant with respect to the shape and size of the particles. The cha…
SBN crystals doped with rare-earth metal ions were studied to show that relaxor ferroelectrics had pronounced anomalies, which manifested themselves by the noncoincidence of the trajectories of the first several cycles of dielectric hysteresis loops, the absence of an unambiguous coercive field, and other special feat…
Nylon/polyester (N/P) conjugate fibers are split by alkaline hydrolysis and then finished with an antimicrobial agent, and the effect of splitting and finishing on the absorption/adsorption properties of the microfibers is studied. The split microfiber fabrics vary in weight loss and pore structure depending on the va…
Die Verbindung [N(CH3)3C16H33]4Mo8O26 wurde mit Hilfe einer Templatsynthese in Form plättchenförmiger Einkristalle synthetisiert und röntgenographisch charakterisiert (P1 (Nr. 2); a = 1003.0(4) pm, b = 1123.6(4) pm, c = 2528(1) pm, α = 97.42(3)°, β = 96.09(3)°, γ = 115.76(3)°; Z = 1). [N(CH3)3C16H33]4Mo8O26 ist ein kr…
Abstract A cholesteric texture was induced in the liquid crystal (a mixture of N-(4-ethoxybenzylidene)-4-n-alkylanilines doped with (R)-(+)-1,1′-bi-2-naphthol and racemic chromium tris(3-butyl-2,4-pentanedionate) (Cr(3-Buacac)3) by the irradiation of right circular polarized light (r-CPL) and resulting chiroselective…
Different models for the theoretical description of bare crystalline surfaces are compared and discussed in terms of stoichiometry and conservation of point symmetry. While infinite models such as the semi-infinite model or the slab model generally preserve the symmetry of the perfect crystal surface, special care has…
Water molecules retained in native cellulose gels obtained from Acetobacter xylinum (AX) were displaced by poly(ethylene glycol)s (PEG) of different molecular weight. The so obtained native cellulose/PEG material, characterized in film form by differential scanning calorimetry, dynamic mechanical thermal analysis and…
The electronic structure of a ferroelectric Bi 4 Ti 3 O 12 (BIT) thin film was investigated by soft-X-ray emission spectroscopy (SXES). In the valence band energy region, Ti 3 d and O 2 p partial density of states were observed in O 1 s and Ti 2 p SXES spectra. The energy position of the Ti 3 d state overlapped with t…
The performance of a spherical field-free and a conical retarding-potential Mott polarimeter is compared. The stability of the detector signal with respect to a change in the position of the incoming electron beam is studied for two different primary electron beam energies. Shifting the incoming electron beam by 0.6 m…
Sulfate minerals commonly form in the oilfield environment due to secondary recovery operations. Two essential tools for identification of these minerals are Fourier transform infrared (FT-IR) and Raman spectroscopies. In this paper, a comprehensive database of the FT-IR and Raman spectra of these minerals has been co…
We have studied the characteristics of reactive ion etching for zinc telluride using CH4 and H2 gases. The effects of CH4/H2 gas composition, total gas pressure, and plasma power on the etching properties were investigated. It was found that variation of the CH4 concentration in gas mixtures leads to changes in both t…
This is the first protein intermediate obtained in the crystalline state by the simultaneous process of Fe(3+) binding and crystal nucleation and is also the first structure of an intermediate of lactoferrin in the Fe(3+) binding pathway. Lactoferrin is an iron-binding 80-kDa glycoprotein. It binds Fe(3+) very tightly…
CaBi 4 Ti 4 O 15 (CBTi144) and SrBi 4 Ti 4 O 15 (SBTi144) thin films were prepared on Pt-passivated silicon substrate using complex metal alkoxide solutions. The CBTi144 thin films crystallized to a single phase of perovskite at 650°C via a mixture of perovskite and pyrochlore phases. The 650°C-annealed CBTi144 thin f…
Abstract Mixed-layered phyllosilicates with composition intermediate between mica and chlorite were identified in very low-grade metaclastites from the Malàguide Complex (Betic Cordilleras, Spain), and studied by X-ray diffraction, and transmission and analytical electron microscopy. They occur both as small grains in…
Powder neutron thermodiffraction studies have allowed a precise determination of the magnetic phase diagrams of the $R{\mathrm{Mn}}_{12\ensuremath{-}x}{\mathrm{Fe}}_{x}$ series $({\mathrm{ThMn}}_{12}$ structure) with the occurrence of two different ordering temperatures ${T}_{N}$ and ${T}_{C}$ correlated, respectively…
The iron complex of 2(3),9(10),16(17),23(24)-tetra[1,5-di(3-triethoxysilyl-propyl)biuryl]phthalocyanine (1) was prepared by reacting iron tetraaminophthalocyanine with 3-(triethoxysilyl)propyl isocyanate. This complex was directly grafted onto silica to give a supported catalyst without preliminary modification of sil…