Print ISSN: 1681-6900

Online ISSN: 2412-0758

Volume 01, Issue 1 (4 Articles)

Volume 01, Issue 1 (4 Articles), October 1977


Recent Developments In Memories: The Bubble Memory

K. Patel

Engineering and Technology Journal, 1977, Volume 01, Issue 1, Pages 5-47

Large increases in the storage capacities of computers will be needed in the near future. Amongst other technologies, the bubble memory has been suggested as a solid replacement for the electro-mechanical disc. This paper outlines the fundamental basis of operation and the organization of a magnetic bubble memory. The physical implementation of the functions of storage, generation, detection and transfer of the domain are described in order to realize the bubble memory.

A Comparison of Flexural strength design to working stress design, for reinforced concrete rectangular sections subject to simple bending

M. Tarik El-Katib

Engineering and Technology Journal, 1977, Volume 01, Issue 1, Pages 48-80

The paper investigates the relationship between the two standard methods of design that are used for dimensioning reinforced concrete rectangular sections subject to simple bending, namely, the flexural strength design method, and the working stress design method. It makes it possible (within certain limitations) to use either method to obtain identical results. It establishes the stress factors to be used in working stress design that would give results equivalent to a specified set of load factors that are adopted by the flexural strength design method, and vice versa.

Porosity and dimensional changes in Cu and Cu-Ni system

Abdul-Razzaq Ismail Kheder

Engineering and Technology Journal, 1977, Volume 01, Issue 1, Pages 81-102

The porosity formed during interdiffusion in OFHC Cu/Ni diffusion couples, and in OFHC Cu discs and cylinders due to hydrogen have been studied. Different Volumes of porosity and dimensional changes were obtained after diffusion annealing in Vacuum and in 1 atm argon gas under similar conditions. porosity introduced previously in OFHC Cu prior to welding to Ni affected the subsequent porosity during Diffusion annealing. Pretraining of specimens showed extensive porosity but with reduced sizes. These observations can create problems in many engineering areas such as coating of materials, composite materials and where fine tolerances are required.   

An optimum expanded model of control charts when there are several assignable causes

T. I. Sultan

Engineering and Technology Journal, 1977, Volume 01, Issue 1, Pages 103-113

In a previous work, the optimum design of X charts when there is a single assignable cause occurring randomly was studied. The present article extends the study to allow for the occurrence of several assignable causes. 14 independent variables are encountered in the model. The optimum values of the size and Frequency of sampling and the position of control limits are to be seeked.