Materials Literature
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Temperature rises of various oils were measured in both impact tests and quasi-adiabatic compression tests. A steel ball impacted against an oiled sapphire glass in the impact test. It was found that the maximum temperature rise was 45 °C in impact tests. A close relationship between temperature rise and α a max was f…
The results of studies of the effect of thermal annealing on the magnetic properties of thin films of Co-Pd alloys are described, along with a method for obtaining easy-axis perpendicular anisotropy in these materials. The method consists of depositing layers of the alloy on a substrate whose thermal expansion coeffic…
Zirconium nitride (ZrN) coatings have been deposited on polished steel substrates by a plasma-beam sputtering technique in a Sputron apparatus (Balzers A. G.) at 200 °C. A thin intermediate layer of Zr (0.08 μm) was deposited between the substrate and the 2.8 μm thick ZrN coating. The average roughness, Ra, of the sub…
An imidazolate bridged dinuclear nickel(II) complex, μ-(Im)-[(232-tet)Ni]2(ClO4)3, where 232-tet = N, N′-bis(2-aminoethyl)-l, 3-propanediamine, Im = imidazolate anion, has been synthesized and its crystal structure determined. Crystals are monoclinic, space group C2, with a = 11.982(4), b = 12.320(2), c = 11.711(4) Å,…
Titanium nitride (TiN) coatings have been deposited on polished steel substrates by a plasma-beam sputtering technique in a Sputron apparatus (Balzers A. G.) at 200 °C. A thin intermediate layer of Ti (0.08 μm) was deposited between the substrate and the 2.8 μm thick TiN coating. The average roughness, Ra, of the subs…
High speed steel is a very difficult materialfor shape casting owing to the formation of eutectic carbide networks during its solidification. These networks cause the steel to be brittle which is detrimental to the mechanical properties of tools manufactured from the material. In the present research, the effect of re…
The stress relaxation behavior of polyurethane elastomer and short polyester fiber filled elastomer composites with and without bonding agents at different strain levels and strain rates was studied. It was found that these compounds exhibit a multistage relaxation mechanism and that the rate of relaxation and cross-o…
Silica waste fume is a byproduct produced in the manufacture of ferrosilicon. The sample, which was very fine and rich in silica, was characterized using chemical and spectrophotometric measurements (XRD and electron microscope). The silica fume was incorporated in anticorrosive paint formulations based on alkyd resin…
In the previous paper [2], we studied the effect of a hybrid tail on the S*c phase range of a three-ring core mesogen. It is concluded that the ether tail has a small number of contorted, but energetically favored conformers. The hybrid tail has a slightly contorted minimum energy conformation but the fluorine substit…
Measurement of the room temperature Trp triplet state lifetime in proteins by time-resolved phosphorescence can provide valuable information on the structure and dynamics of proteins in solution. Our time-resolved absorption measurements on the long-lived states resulting from electronic excitation of the chromophore…
Abstract The hydrothermal synthesis of Mg-beidellite in which limited amounts of Ga and Cr are clearly shown to be incorporated into nonexchangeable positions in the clay layer framework is reported for the first time. Elemental analyses indicate that, up to at least 15 mole percent, Ga can replace Al virtually comple…
115 mm shaped charges were fired at a constant built-in standoffs of 3 caliber against on both sides with steel plate covered glass targets from 0° to 60° NATO angles. The residual jet tip velocities and the disturbed jet regions have been analyzed from double flash X-ray pictures of the residual jet behind the target…
A new chiral hemicarboxonium salt, (ephem)(BF 4 ), was synthesized by action of α-1-((methylamino)ethyl)benzyl alcohol, (−)-ephedrine, on a carboxonium tetrafluoroborate salt. The compound crystallizes in monoclinic space group P 2 1 . a = 11.153(1) Å, b = 8.187(1) Å, c = 16.104(1) Å, β = 91.26(1)°, Z = 2. The molecul…
The thermal conductivity λ(x=0,0.15,0.3,0.6;T=2–200 K) and electrical resistivity ρ(0⩽x⩽0.5;T=6–300 K) of layered crystals Nb1−xSnxSe2 are measured in the ab plane. The metal– semiconductor transition is observed at x≈0.5. The magnitude of the resistivity anomaly observed at 33 K and associated with a transition to th…
The Ca2+-transporting ATPase has been labeled with N-cyclohexyl-N'-(4-dimethyl-amino-alpha-naphthyl)carbodiimide (NCD-4), a fluorescent carbodiimide which reacts with carboxyl groups of acidic residues. It has been reported that NCD-4 labels a transmembrane portion of the protein at the high-affinity calcium-binding s…
Promoted by the European Steel Industry under the sponsorship of ECSC, the multinational megaproject on “Scrap recycling for high quality products” aims particularly at a clear quantitative assessment of the effects of the tramp elements on the steel properties. The most relevant results gained at the two thirds of th…
Article Crystal structure of the clathrates Rb8Ga8Sn38, Rb8Ga8Ge38 and Rb8Ga8Si38 was published on April 1, 1998 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 213, issue 1-4).
Abstract Biomaterials may be defined as artificial materials which fulfill the mechanical requirements and interact with the biosystem they are in contact with in same way as a natural material would react in the same place. While the requirements of mechanical properties can be reached by suitable organo‐polymeric an…
Abstract : Composite materials are found to lose mechanical on exposure to aircraft operating environments. This is mainly due to absorption of moisture from humid air by the matrix material. Composite materials are extensively used by the RAAF for both major structural components on the F/A-18 and for bonded repairs…
Using 58 keV (0.214 Å) synchrotron radiation we have obtained virtually extinction-free data on Al 2 O 3 . Refinement of a multipole model against these data produced deformation densities of high quality, which compare well with theoretical maps.