The Use of Echocardiography in Pediatric Interventional Cardiac Catheterization Procedures

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/74658/1/j.1540-8183.1995.tb00584.x.pd

A Design to Digitalize Hydraulic Cylinder Control of a Machine Tool

Conventionally hydraulic piston - cylinder servos are actuated using analogue controls for machine tool axis drives. In this paper a design of the axis control system of an NC milling machine which employs a small stepping motor to digitally actuated hydraulic piston - cylinder servo drives existing on the machines Y-axis is described. The digital control designed in this study was practically tested and found to be a linear servo, thus making it suitable for economic control from a computer

Quality Productivity Circle in Manufacture

A brief history of quality control and productivity is hereby traced. The cultural implications of quality Circle management technique are discussed in its relationship with productivity. The paper emphasizes the role of total preventive maintenance in productivity and quality improvements. In all these the workforce holds the key, the only key, to success in the creation of wealth and so should be made sound in body (and spirit) through appropriate training and motivation

Traditional fermented protein condiments in Nigeria

Traditional fermented condiments (dawadawa, iru, ogiri) based on vegetable proteins, and consumed by different ethnic groups in Nigeria have been the pride of culinary traditions for centuries. It is evident that these products have played a major role in the food habits of communities in the rural regions serving not only as a nutritious non-meat proteins substitute but also as condiments and flavouring agents in soups. These condiments are being increasingly marketed throughout the country and beyond in informal ways. Differences in the chemical composition of fermented condiments are evident mainly because different ingredients have been used in their preparation. Traditional methods of manufacture should take advantage of biotechnological progress to assure reasonable quality and atthe same time assure safety of these products. The requirements for a sustainable biotechnological development of Nigerian condiments are discussed in the scope of the microbiology and biochemical changes of the raw materials. Schemes to standardize the manufacturing stages are proposed. Emphasis is placed on the relevance of the role of starter cultures in the traditional methods of manufacture to ascertain appropriate nutritional quality and physical properties of the final product.Fermented vegetable proteins have potential food uses as protein supplements and as functional ingredients in fabricated foods. Relevant research and development activities are suggested

Stepping Motor - Hydraulic Motor Servo Drives for an NC Milling Machine

In this paper the retrofit design of the control system of an NC milling machine with a stepping motor and stepping motor - actuated hydraulic motor servo mechanism on the machines X-axis is described. The servo designed in the course of this study was tested practically and shown to be linear - the velocity following errors being proportional to the axis feedrates. This property makes the servo system suitable for future on-line control from a microcomputer

The Design of a Manual Numerical-Control Circuit for Stepping Motors

The successful application of a stepping motor to drive an indexing or positioning machine depends on the accurate knowledge of the machines components, resolutions and dynamic behaviour. This paper describes the design of an electronic numerical control system used to measure the necessary mechanical characteristics of a machine tool prior to its being retrofitted with stepping motor drives. This design enables the manual selection of the axis to be driven and the axis displacement after which motion on the axis is automatically halted. Using this design a machine resolution (accuracy) of 0.00254mm (0.0001 in) was achieved on the machine tool used in this investigation