Crystal structure of LuRuB2

Ternary metal borides of the formula MTB₂ have been synthesized in a new structure for M=Sc, Y, Tb, Dy, Ho, Er, Tm, Lu, and T=Ru, Os. Single crystal x-ray diffraction data on LuRuB₂ were refined on an orthorhombic unit cell, space group Pnma, Z=4, and yielded an R factor equal to 0.085. All metal atoms are coplanar with short bond distances of 3.10Å between rare earth atoms which are arranged in zig-zag chains.     

Superconductivity of new ternary borides with the LuRuB2-type structure

A new group of superconducting ternary borides has been found with the general formula MTB₂, where M is Sc, Y or Lu and T is Ru or Os. The superconducting transition temperatures range from 1.3K for ScOsB₂ to 10.0K for LuRuB₂. Additionally, ismorphous compounds with M=Tb, Dy, Ho, Er or Tm order magnetically with critical temperatures in the range 2K to 46K. The occurrence of superconductivity and magnetism in this new ternary boride structure is discussed with respect to analogous data in MT₄B₄ systems.     

Regression under stress to first learned behavior.

A test of the "regression to first learned behavior hypothesis" was made by teaching Ss 2 methods of tying knots, placing them under a stress condition, and observing which of the 2 methods were employed. The data are reported as confirming the hypothesis. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On Beck's problem

Based on the concept of internal constraint the discrete Beck's problem is solved by means of static methods.     

On the adaptive control of linear systems using the open-loop-feedback-optimal approach

This paper considers the suboptimal stochastic control of linear discrete-time dynamical systems with uncertain or stochastically varying parameters. The suboptimal scheme is based upon the use of the open-loop-feedback-optimal (OLFO) method. The state and parameter estimates are generated by an extended Kalman filter algorithm. Numerical results for first-order systems are presented.     

Ways of intensifying drying processes

This paper gives some results of investigations aimed at finding ways of increasing the rates of heat and mass transfer in drying.Translated from Inzhenerno-Fizieheskit Zhurnal, Vol. 19, No. 3, pp. 491–500, September, 1970.     

Bestimmung der Betriebsphasenimpedanzen in einem Dreiphasenleitersystem mit verzweigten Leitern

Übersicht In dieser Abhandlung werden der analytische Weg und die zahlenmäßige Berechnung der Phasenströme, Phasenspannungen und Phasenimpedanzen im Dreiphasenleitersystem ohne Nulleiter mit großen Strömen gezeigt, in dem jede Phase aus mehreren elektrisch parallel geschalteten Leitern besteht. Die Energiebilanz wird aufgestellt und die Energieverluste des Leitersystems werden berechnet.

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Contents In this article the analytical method and the numerical calculation are shown of the phase currents, of the phase tensions and of the phase impedances in a threephase conductor system without zero conductor and with branched conductors. The energy balance is set up and the energy losses in the conductor system are calculated.

     

Practical prediction of time-dependent deformations of concrete

The model for drying creep from Part III is here extended for the temperature effect. The basic, additive form of the double power law and the shrinkage-like term are preserved, but certain coefficients become temperature-dependent to reflect the acceleration of drying and of aging. Satisfactory agreement with test data is achieved.

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Résumé On applique ici à l'influence de la température le modèle de fluage décrit dans la troisième partie. On conserve la forme de base qui est celle d'une forme additive de la loi de double puissance et du terme qui correspondrait au fluage, mais certains coefficients deviennent dépendants de la température afin de traduire l'accélération du séchage et du vieillissement. On obtient une bonne concordance avec les résultats d'essai.