Materials Literature
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A series of free base and zinc porphyrins, mono meso-substituted with a pyridyl group via an amide link, have been prepared by stepwise functionalisation of free base tetraphenylporphyrin, H2tpp. Four [W(CO)5L] (L = pyridyl-porphyrin) complexes have been synthesised; [M{tpp-NHCO-py-W(CO)5}], where M = 2H or Zn, one ph…
Research Article| March 01, 2002 Inherited correlation in crystal size distribution: COMMENT Bruce. D. Marsh; Bruce. D. Marsh 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA Search for other works by this author on: GSW Google Scholar Michael D. Higgins Michael D.…
A porous La0.6Sr0.4Co0.2Fe0.8O3-Ce0.9Gd0.1O1.95 (LSCF-CGO) green body was prepared from a water-based slurry by a freeze-drying process. The LSCF-CGO slurry was frozen, controlling the growth direction of ice, and it was sublimated at a reduced pressure. After sintering the green body at 1350°C, the obtained porous su…
In this paper, the three important aspects of SiC materials, that is, the powder synthesis, the sintering process, and the theory of sintering and grain growth are reviewed. They are summarized as follows.(1) SiC precursors were derived from the liquid materials of silicon-tetraethoxide and phenolic resin. Homogeneous…
By means of surface characterization and subsequent hot-dip galvanizing tests, both Al-alloyed TRIP grades showed good galvanizability.
Two new classes of mono- and bis-D–π–A cryptand derivatives with a flexible and a rigid cryptand core have been synthesized. The linear and nonlinear optical properties of these molecules are probed. The three dimensional cavity of the cryptand moiety has been utilized to modulate the SHG intensity to different extent…
Research Article| March 01, 2002 Inherited correlation in crystal size distribution: COMMENT Helmut Schaeben; Helmut Schaeben 1Institut für Geologie, TU Bergakademie Freiberg, Germany Search for other works by this author on: GSW Google Scholar K. Gerald van den Boogaart; K. Gerald van den Boogaart 1Institut für Geo…
A new class of phthalocyanine derivatives containing fused [5]helicene moieties has been synthesized. These derivatives, named as helicenocyanines, are soluble in common organic solvents and exhibit significant red shift of Q-band absorptions. Electrochemical, thermal and fluorescence characteristics of these heliceno…
The equations of state and phase stability of calcium chalcogenides, CaS, CaSe and CaTe are investigated via first principles theoretical calculations. We report results of the structural properties of these compounds in the B1(NaCl) and the B2(CsCl) phases, the theoretical transition pressure and the volumes compress…
Magnetization, susceptibility, and specific heat measurements were made on a single crystal of La 0 . 7 5 Sr 0 . 2 5 MnO 3 . The ferromagnetic-to-paramagnetic phase transition was found at 346 K and four critical exponents were measured as: α=0.05′0.07, β=0.40′0.02, γ=1.27′0.06, and δ=4.12′0.33. The values of critical…
The rate of radula production in the chiton Acanthopleura hirtosa (Blainville, 1825) was determined by following structural irregularities induced in the radula using a cold-shock treatment of 4°C for 48 h. In animals treated in this manner and subsequently maintained in an artificial intertidal habitat to ensure, as…
Here the author outlines only a few nanoscale phenomena that adversely affect thermal conductivity and can complicate heat removal from nanoscale electronic devices. Since progress in the electronic industry is largely associated with device down-scaling, he considers that research on this subject is worth pursuing.
Five isomeric β,β′-diformyl-meso-tetraphenylporphyrins, and the corresponding nickel complexes, were synthesised, separated and fully characterised by NMR.
In this paper the design and the manufacture of a 3-dof (degrees of freedom) robot driven by shape memory alloys (SMA) is presented. This robot has a parallel structure including a fixed plate and a moving plate. The plates are linked together by 3 SMA wires and a mechanical spring is located in the central part. Poss…
In the last phase of the core degradation, an oxidic melt pool of mainly UO2, ZrO2, and unoxidized Zircaloy and stain-less steel will form in the lower head of the RPV (Theofanous et al., 1996). A molten metal layer (composed mainly of Fe and Zr) will rest on the top of the crust of the oxidic pool. A thin oxidic crus…
In order to improve initial activation properties of TiFe alloy, simple ion implantation and ion mixing with the deposition of LaNi5 were carried out at room temperature. The results show that argon-ion mixing caused extensive improvement of initial activation, wherein hydrogenation was easily effected at 373 K and 1…
The new compound [Co(η5-C5H5)(dppf-P,P′)I]I, 1, was synthesised by the stoichiometric reaction of the Co(III) complex [Co(η5-C5H5)(CO)I2], 2, with 1,1′-bis(diphenylphosphino)ferrocene (dppf) in CH2Cl2, and was characterised by multinuclear NMR spectroscopy. Exposure to air of THF or CH2Cl2 solutions of compound 1 gave…
The following topics are dealt with: thermal phenomena; air cooling limits; advanced simulation methods for electronics cooling; compact models; integrated biochips; MEMS; thermal management; power electronics systems; convection cooling; heat pipes; heat sink characterization; high flux liquid cooling; thermal CAD; c…
The effect of the alloy compositions on the cyclic bending fatigue behaviors of the Ti–Ni base shape memory alloy wires was investigated using a rotary bending fatigue tester specially designed for wires. The fatigue test results were discussed in connection with the static tensile properties. The results were summari…
Alkylation of pyridine by methanol to methylpyridines has been studied in the vapour phase in a fixed bed reactor, in the temperature range 473–723 K over the Zn1 − xMnxFe2O4 (x = 0, 0.25, 0.50, 0.75 and 1) ferrospinel system. 2-Picoline and 3-picoline were found to be major products. It was observed that, systems pos…