Materials Literature
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At room temperature, a kink in negative fields appears in the hysteresis loops of Nd-Fe-B permanent magnets. This phenomenon can be related to the fact that the grains at the surface of the magnet exhibit a strongly reduced coercivity compared to those of the bulk. Below 130 K a kink of another nature develops. It is…
Abstract The temperature dependence of electrical resistivity and thermoelectric power of the intercalation compounds of M x TiS 2 (M = Mn, Fe, Co, and Ni; 0 ≦ x ≦ 1/3) with layered structures are measured over the temperature range 1.5 to 300 K. These experimental results can be explained by a simple model, which tak…
A product consisting of two vinylogous amidinium ions is formed when the title compounds gives up two electrons to iodide. The resulting salt forms diamagnetic, blackish-violet crystals. The two mesomeric π-electron systems are almost planar; the sixmembered ring in 1 has a twist-conformation.
The properties of a soluble endoprotease from rat liver were studied. The enzyme was purified in a latent form. It sedimented as a single component with a sedimentation coefficient (S(0)20,w) of 19.8 S. Measurement by quasi-elastic light scattering gave a diffusion coefficient (D(0)20,w) of 2.5 X 10(-7) cm2 X s-1 and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper(II) and nickel(II) trinuclear species with dithiooxamide derivative ligands: structural, magnetic, spectroscopic, and electrochemical propertiesRichard Veit, Jean Jacques Girerd, Olivier Kahn, Francis Robert, and Yves JeanninCite this: Inorg. Chem. 1986, 25, 23, 4175–…
Lonberg and Meyer [Phys. Rev. Lett. 55, 718 (1985)] have recently discovered in polymer nematics the existence of a critical value ${r}_{c}$=0.303 for the ratio r=${K}_{2}$/${K}_{1}$ between the twist and splay Frank elastic constants, below which a periodic splay-twist distortion is energetically favored with respect…
Electrostatic membrane mirrors are potentially useful as aberration generators. To realize this capability, it is necessary to know the influence functions (each giving mirror response to a single electrode) and then to use a fitting procedure to determine the optimal voltage settings for reproducing a desired surface…
The authors present a theory for the static, paramagnetic, spin susceptibility for metals at finite temperatures. It is based on a 'first principles' mean-field theory of itinerant magnetism and provides an expression which resembles that of a classical Heisenberg model added to an itinerant component. The quantities…
The wall-to-wall polymerization contraction of two restorative resins was investigated in butt-joint dentin cavities prepared in extracted human teeth. The cavity diameter was 4 mm, and the cavity depth ranged between 0.5 and 3.0 mm. The width of the maximum marginal contraction gap was measured, using a light microsc…
This paper describes the results of low-energy electron transmission and secondary-electron emission experiments on thin films of long-chain alkanes deposited on metal substrates. The spectral changes due to crystal-melt phase transition were measured in situ in both experiments. The ground-state energy ${V}_{0}$ of t…
The ability of a group of water-soluble metalloporphyrins to cleave DNA has been investigated. Incubation of Mn3+, Fe3+, or Co3+ complexes of meso-tetrakis(N-methyl-4-pyridiniumyl)porphine (H2T4MPyP) with DNA in the presence of ascorbate, superoxide ion, or iodosobenzene results in DNA breakage. Comparisons between th…
Abstract Two conventions have been used to represent smectite formulas in mineral hydrolysis reactions: exchangeable cations are either included in (monophase structure) or excluded from (charged structure) the Standard State phase designation. Replicate mixtures of K‐saturated Belle Fourche montmorillonite, kaolinite…
Auxospore formation and vegetative cell division are described for Mastogloia smithii. This species is unique among raphid diatoms for its cis-type behavioural anisogamy. This results in both auxospores being formed within one gametangial frustule. Auxospore formation in M. smithii has its closest parallels with certa…
It is shown that the quantity of water mixing into the air-flow is an insignificant proportion of the total amount of water used in the air-jet texturing process and that this has a negligible effect on the air-flow in the texturing nozzle. It is suggested that only a fraction of this water is needed to impart the des…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and electrochemical properties of iridium-carbon bonded metalloporphyrins. Characterization of (OEP)Ir(C8H13) and (OEP)Ir(C8H13)(CO)J. L. Cornillon, J. E. Anderson, C. Swistak, and K. M. KadishCite this: J. Am. Chem. Soc. 1986, 108, 24, 7633–7640Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo New Tetranortriterpenoids from Azadirachta indicaSalimuzzaman Siddiqui, Tariq Mahmood, Bina Shaheen Siddiqui, and Shaheen FaiziCite this: J. Nat. Prod. 1986, 49, 6, 1068–1073Publication Date (Print):November 1, 1986Publication History Published online1 July 2004Published…
The safeguard aspects of Cm-244 - a nuclear waste product in LWRs - in a cylindrical hybrid blanket, driven by a (D,T) fusion neutron source have been analyzed.Cm-244 has been investigated for two different applications:1) As a neutron multiplier between the first wall and the fuel zone in a blanket with ThO22) As a c…
The properties of the supply yarn and the processing parameters together determine the final properties of air-jet-textured yarns. An investigation is reported on how variations in overfeed, air-pressure, and texturing speed, wet or dry processing, and the use of an impact element each affect the properties of the yar…
The effect of nozzle design on the air velocity for an air-jet filling insertion system has been investigated. The relationship between the supply air pressure and the air velocity at the nozzle axis is explained using a simplified model for the nozzle. The presence of the yarn tube has a substantial influence on nozz…
The resistivity of tungsten films prepared by magnetron sputtering, electron gun evaporation, and chemical vapor deposition was measured in the 4.2–297 K temperature range. The resistivity ρ in all films decreases linearly with temperature down to 60 K, indicating that scattering by lattice phonons is responsible for…