NMR characterisation of five isomeric β,β′-diformyl-meso-tetraphenylporphyrins
Five isomeric β,β′-diformyl-meso-tetraphenylporphyrins, and the corresponding nickel complexes, were synthesised, separated and fully characterised by NMR.
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Design of a Parallel Robot Actuated by Shape Memory Alloy Wires
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…
Simeco Tests in a Melt Stratified Pool
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…
Effect of Surface Modification by Ion Implantation on Hydrogenation Property of TiFe Alloy
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…
Synthesis, X-ray structures, electrochemistry, magnetic properties, and theoretical studies of the novel monomeric [CoI 2 (dppfO 2 )] and polymeric chain [CoI 2 (μ-dppfO 2 ) n ]
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…
ITherm 2002. Eighth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.02CH37258)
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…
Fatigue Properties of the Ti-Ni Base Shape Memory Alloy Wire
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…
Vapour phase methylation of pyridine with methanol over the Zn 1 − x Mn x Fe 2 O 4 (x = 0, 0.25, 0.50, 0.75 and 1) ferrite system
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…
Mechanisms Of Mineral Scale Inhibition
Mechanisms Of Mineral Scale Inhibition M.B. Tomson; M.B. Tomson Rice University Search for other works by this author on: This Site Google Scholar G. Fu; G. Fu Rice University Search for other works by this author on: This Site Google Scholar M.A. Watson; M.A. Watson Rice University Search for other works by this auth…
Stabilization of Platinum Anode Catalyst in a H[sub 2]S-O[sub 2] Solid Oxide Fuel Cell with an Intermediate TiO[sub 2] Layer
The performance of supported platinum as an anode catalyst in a hydrogen sulfide solid oxide fuel cell with yttria-stabilized zirconia (YSZ) as the electrolyte has been examined in the temperature range of 700-900°C. The highest current density achieved at 800°C was 100 mA/cm 2 and the highest power density was 15.4 m…
Design of a heatpipe-cooled Mars-surface fission reactor
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation David I. Poston, Richard J. Kapernick, Ray M. Guffee, Robert S. Reid, Ronald J. Lipinski, Steven…
Trial production and testing of cement-bonded particleboard from rattan furniture waste
An investigation was conducted on the use of rattan (cane) furniture waste as furnish material for the manufacture of cement-bonded particleboard (CBP). Laboratory scale CBPs were fabricated from hot water pretreated chopped strands of mixed rattan waste obtained from rattan furniture workers in Ibadan, Oyo State, Nig…
Effect of Morphology of Copper Precipitation Particles on Hydrogen Embrittlement Behavior in Cu-Added Ultra Low Carbon Steel
Changes in fracture and hydrogen evolution behaviors in Cu-added ultra low carbon steels due to hydrogen charging were examined by small punch (SP) tests and thermal desorption spectroscopic (TDS) analyses, respectively, to understand effect of morphology of copper precipitation particles on susceptibility to hydrogen…
Effect of sodium content on the crystallization behavior of fluoramphibole glass–ceramics
The purpose of this study was to evaluate the effect of sodium content on the crystallization behavior of glass-ceramics in the system SiO(2)-MgO-CaO-Na(2)O-K(2)O-F. Five glass compositions were prepared with increasing sodium content. The compositions were melted at 1400 degrees C for 2 h and cast into 60 x 12-mm ing…
Morphology and failure in nanocomposites. Part I: Structural and mechanical properties
Nanocomposites are expected to exhibit new and improved properties when compared to their microcomposite counterparts. By lowering the particle size to nanodimensions (<100 nm), the special effects in polymer composites appear. In this study we compared the properties of composites filled with micro- and nano-sized ca…
Overview of materials technologies for space nuclear power and propulsion
A wide range of different space nuclear systems are currently being evaluated as part of the DOE Special Purpose Fission Technology program. The near-term subset of systems scheduled to be evaluated range from 50 kWe gas-, pumped liquid metal-, or liquid metal heat pipe-cooled reactors for space propulsion to 3 kWe he…
First-Order Transition of Fe 2 P and Anti-Metamagnetic Transition
A fixed-spin-moment (FSM) calculation is carried out for Fe 2 P using the linear muffin-tin orbital method. It is found that the Fe atom at the 3f site shows a metamagnetic behavior, while the Fe atom at the 3g site is ferromagnetic. In order to study the magnetic properties of this compound at finite temperatures, a…
Syntheses and magnetic properties of hexanuclear [Cp 2 Mn 3 (L 1 ) 4 ] 2 and octanuclear [Mn 8 (L 2 ) 12 (μ 4 -O) 2 ] (L 1 = 2-HNC 5 H 5 N, L 2 = 2-NH-3-Br-5-MeC 5 H 3 N, Cp = C 5 H 5 )
The reactions of manganocene, Cp2Mn, with 2-aminopyridine (L1H) or 2-amino-3-bromo-5-methylpyridine (L2H) give the novel hexanuclear and octanuclear Mn(II) amido cage compounds [Cp2Mn3(L1)4]2 (1) and [Mn8(L2)12(mu 4-O)2] (2); magnetic measurements on which provide a rare insight into the magnetic properties of amido-b…
Morphology Control of Zinc Deposits of Electrogalvanized Steel Sheets
The visual appearance, press formability and the corrosion resistance of electrogalvanized steel sheets change depending on the morphology of deposited Zn. In this paper, the effects of plating factors such as the surface condition of steel substrate, electrolysis factors and the bath condition on the morphology of de…
Neutron-diffraction study of the Jahn–Teller transition in PrMnO 3
The stoichiometric perovskites RMnO3 (R = rare earth) experience Jahn–Teller (JT) transitions as a function of temperature and R size similar to that recently described for LaMnO3. We have investigated the JT transition for R = Pr by ATD techniques and neutron powder diffraction. This transition takes place at approxi…