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Now showing items 1-10 of 58

#### Relaxation phenomena in polycrystalline molybdenum at 10 MHz

(1991)

The internal friction of cold-worked polycrystalline molybdenum has been measured in the temperature range from 120 to 300 K at a frequency of 10 MHz using conventional ultrasonic pulse echo techniques. Three relaxation ...

#### Estimation of inorganic particulate matter in the atmosphere of Isa Town, Bahrain, by dry deposition

(1991)

Inorganic particulate matter was sampled weekly during the period April 1985-April 1986 in Isa Town, Bahrain. The mean annual conductivity of water-soluble inorganic particulate matter was 59.99 ?Scm-1; pH 7.5; total ...

#### Modelling the static characteristic of Zener diodes for computer-aided design

(1991)

An empirical formula is presented for the static current-voltage characteristic of the Zeper diode. The three parameters of the formula can be extracted easily from separate regions in the device characteristic using simple ...

#### Empirical model for the current-voltage characteristic of resonant-tunneling devices

(Kluwer Academic Publishers-Plenum Publishers, 1991)

An empirical model is presented for the current-voltage characteristics of resonanttunneling (RT) devices. By using this model an analytical study of millimeter-band electronic circuits employing RT devices can be performed. ...

#### Asymptotic theory for third-order differential equations with extension to higher odd-order equations

(1991)

An asymptotic theory is developed for linear differential equations of odd order. Theory is applied with large coefficients. The forms of the asymptotic solutions are given under general conditions on the coefficients. � ...

#### Optimum design of geometrically nonlinear elastic-plastic steel frames

(1991)

A structural optimization algorithm is presented for geometrically nonlinear elastic-plastic frames. The algorithm is obtained by coupling the optimality criteria approach with a large deformation analysis method for ...

#### Effects of neutron and gamma irradiation on the dislocation relaxation peak in very pure copper single crystal of ?110? concentration

(1991)

The effects of neutron and gamma irradiation on the height and temperature of the dislocation relaxation peak (Bordoni peak) have been studied in four very high purity copper single crystals having the orientation ?110?. ...

#### A simple approximation for the hand computation of the error function

(1991)

An algorithm is presented for obtaining simple analytical expressions for the error function erf (x). A simple approximation, convenient for hand computation, with overall root-mean-square error of less than 0-12 per cent ...

#### Optimum design of geometrically nonlinear space trusses

(1991)

A structural optimization algorithm is developed for geometrically nonlinear three-dimensional trusses subject to displacement, stress and cross-sectional area constraints. The method is obtained by coupling the nonlinear ...

#### Studying the behaviour of the dislocation density and the loop length with the compressional deformation at room temperature in high purity polycrystalline aluminium

(1991)

The pulse echo technique was used to measure the ultrasonic attenuation in polycrystalline aluminium crystal having 5N purity. From the measured ultrasonic attenuation and velocity of sound in the metal with the use of the ...