141 research outputs found

    Eating Words

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    A collection of words and phrases associated with foods and drinks

    An Eleven-Letter Positional List

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    In the May 1978 Word Ways, John Meyer exhibited a list of 26 seven-letter words in which the central letter took each alphabetic value (A to Z) and the two three-letter ends were also words. In the August 1978 Word Ways, Leslie Card extended this exercise to nine-letter words, finding examples for all central letters but Q. In this article, we extended it further to eleven letter words

    Top-loading Small-sample Calorimeters for Measurements as a Function of Magnetic Field Angle

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    In quasi-low-dimensional systems, the existence of a particular physical state and the temperature and magnetic-field-dependence of its phase boundary often strongly depends on magnetic field orientation. To investigate magnetic field orientation dependent phase transitions in these materials, we have developed rotatable miniature and sub-miniature sample-in-vacuum calorimeters that operate in dc magnetic fields up to 18 and 45 tesla. The calorimeters cover the temperature range from below 0.1 K to above 10 K; they are able rotate a full 360 degrees relative to the applied magnetic field while remaining at base temperature. Samples are typically ontheorderof1mginmassandupto2mm2 x0.5mminvolume

    Hm to Shads in Up Tibet

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    Recently, while browsing through an old bookstore, having finished the Erotica I ran into the Esoterica. There, on a toadstool table topped with a Victorian mirror, I found a small pamphlet or notebook, badly worm-torn and dog-eared, obviously a poorly-bound student\u27s scratch pad

    Effects of Co substitution on thermodynamic and transport properties and anisotropic Hc2H_{c2} in Ba(Fe1βˆ’x_{1-x}Cox_x)2_2As2_2 single crystals

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    Single crystalline samples of Ba(Fe1βˆ’x_{1-x}Cox_x)2_2As2_2 with x<0.12x < 0.12 have been grown and characterized via microscopic, thermodynamic and transport measurements. With increasing Co substitution, the thermodynamic and transport signatures of the structural (high temperature tetragonal to low temperature orthorhombic) and magnetic (high temperature non magnetic to low temperature antiferromagnetic) transitions are suppressed at a rate of roughly 15 K per percent Co. In addition, for xβ‰₯0.038x \ge 0.038 superconductivity is stabilized, rising to a maximum TcT_c of approximately 23 K for xβ‰ˆ0.07x \approx 0.07 and decreasing for higher xx values. The Tβˆ’xT - x phase diagram for Ba(Fe1βˆ’x_{1-x}Cox_x)2_2As2_2 indicates that either superconductivity can exist in both low temperature crystallographic phases or that there is a structural phase separation. Anisotropic, superconducting, upper critical field data (Hc2(T)H_{c2}(T)) show a significant and clear change in anisotropy between samples that have higher temperature structural phase transitions and those that do not. These data show that the superconductivity is sensitive to the suppression of the higher temperature phase transition

    Systematic effects of carbon doping on the superconducting properties of Mg(B1βˆ’x_{1-x}Cx_x)2_2

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    The upper critical field, Hc2H_{c2}, of Mg(B1βˆ’x_{1-x}Cx_x)2_2 has been measured in order to probe the maximum magnetic field range for superconductivity that can be attained by C doping. Carbon doped boron filaments are prepared by CVD techniques, and then these fibers are then exposed to Mg vapor to form the superconducting compound. The transition temperatures are depressed about 1K/1 K/% C and Hc2(T=0)H_{c2}(T=0) rises at about 5T/5 T/% C. This means that 3.5% C will depress TcT_c from 39.2K39.2 K to 36.2K36.2 K and raise Hc2(T=0)H_{c2}(T=0) from 16.0T16.0 T to 32.5T32.5 T. Higher fields are probably attainable in the region of 5% C to 7% C. These rises in Hc2H_{c2} are accompanied by a rise in resistivity at 40K40 K from about 0.5ΞΌΞ©cm0.5 \mu \Omega cm to about 10ΞΌΞ©cm10 \mu \Omega cm. Given that the samples are polycrystalline wire segments, the experimentally determined Hc2(T)H_{c2}(T) curves represent the upper Hc2(T)H_{c2}(T) manifold associated with HβŠ₯cH\perp c
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