Cellular Scheduling of Batch Production Using

This paper describes a simple computer programme developed for a medium-sized engineering firm manufacturing various types and sizes of machine pinions. The programme is capable of assigning operators to their appropriate machines for the purpose of machining components in a manufacturing system designed on the Group Technology principles. The particular machine or machines an operator can operate were already defined as part of an input data. A number of test runs were made with different batch sizes, firstly, for the purpose of ensuring the proper operation of the computer programme, and secondly to obtain sufficient data on man/machine interaction which is necessary in the analysis in this study

Sequencing for Batch Production in a Group Flowline Machine Shop

The purpose of the paper is to develop a useful technique for sequencing batches of components through machine shops arranged under the group flowline production system. The approach is to apply a modified version of Petrov's group flowline technique for machining components which follow a unidirectional route. An outline of the use of the technique is given and a numerical example is included at the end of the paper to demonstrate the application of the new method

Sampling Plans for Monitoring Quality Control Process at a Plastic Manufacturing Firm in Nigeria: A Case Study

This paper explores the problem of high quality cost at a medium –sized firm manufacturing various types and sizes of plastic container, using a real life data. In pursuance of their quality objectives, the company established a policy that dictates and expensive and time-consuming post-manufacturing process. While the problem of the company’s process control system was being studied, management considered other options that include sampling plans. The sampling plans were evaluated by considering the competing goals of decreasing the shipment of substandard goods, decreasing the percentage of acceptable lot that are erroneously labeled defective, and decreasing the sampling costs. The three sampling plans considered were the current sampling plan, minimum average total inspection (ATI) fixed average outgoing quality level (AOQL) plans, and a compromise plan.  Comparison of the plans on a relative basis shows that the compromise plan is the best choice in term of cost

Improving traverse redundancy and precision by running on double lines

Good redundancy is required in measured quantities to isolate gross errors and improve the qualities of derived parameters. Improving the weak redundancies of traditional traverses by traversing on double lines is now possible with total stations which provide for less cumbersome measurements than previously possible and more so now that control traverses are computed by least squares adjustment using readily available computer software. Traversing on double lines requires some care in choosing traverse stations with inter-visibility to two immediately preceding and two directly succeeding stations from the instrument station. Traverses were run on double lines resulting in redundancy increase of seven per station. Local accuracy precision parameters improved also by as much as 25% and 52% with implementation at 30% and 100% of the traverse stations respectively. A chart that may be used to determine percentage number of traverse stations where traversing on double lines would be implemented to achieve set local accuracy improvements is presented.Keywords: traverse, redundancy, precision, total station, control surveys, traversing on double lines, gross error

Association Between Family Structure and Childhood Obesity in Essex County, NJ.

Obesity is one of the most prevalent nutritional disorders in children in the United States. There are many factors associated with childhood obesity, but there is limited information about the association between family structure and childhood obesity. This quantitative retrospective cross-sectional study, guided by the Social Ecological Model, was carried out to identify the effect of family structure on childhood obesity. For this study, the 2017 National Survey of Children’s Health (NSCH) of children 6-13 years old residing in the state of New Jersey was analyzed. Binary logistic regression was used to determine the relationship between family structure and obesity, and a Chi-square test of independence was used to analyze the relationship between the independent variables. There was statistically significant association between family structure and childhood obesity χ2 (16) = 482.90, p \u3c .001. This study\u27s findings can impact positive social change by encouraging further studies leading to quality improvement in the management of childhood obesity. Moreover, the results could encourage public health professionals to design and implement effective childhood obesity management programs addressing clinical and psychosocial services needed to improve the knowledge and management of childhood obesity

Polyethylene/Polyhydroxyalkanoates-based Biocomposites and Bionanocomposites

The development of advanced polymer composite materials having superior mechanical properties has opened up new horizons in the field of science and engineering. Polyethylene (PE) is considered one of the most widely used thermoplastics in the world due to its excellent properties which have excellent chemical inertness, low coefficient of friction, toughness, near-zero moisture absorption, ease of processing and electrical properties. Polyhydroxyalkanoates (PHAs) are garnering increasing attention in the biodegradable polymer market because of their promising properties such as high biodegradability in different environments. This chapter covers polyethylene/polyhydroxyalkanoates-based biocomposites and bionanocomposites. It summarizes many of the recent research accomplishments in the area of PE/PHAs-based biocomposites and bionanocomposites such as state-of-the-art regarding different methods of their preparation. Also discussed are different characterization techniques and use of PE/PHAs-based biocomposites and bionanocomposites in biomedical, packaging, structural, military, coating, fire retardant, aerospace and optical applications, along with recycling and lifetime studies

Academic Research International INFLUENCE OF SURFACE LIGNIN CONCENTRATION ON FIBRE SURFACE CHARACTERISTICS AND TENSILE PROPERTIES OF OIL PALM FIBRE/UREA-FORMALDEHYDE RESIN COMPOSITE

ABSTRAC

Studies on reactive compatibilization and dynamic vulcanization of polypropylene/epoxidized natural rubber blends filled with carbonized dika nutshell powder

ABSTRACT Carbonized Dika nutshell filled -polypropylene (PP)/epoxidized natural rubber (ENR) blen