Manna and Chaudhuri (Eur. J. Oper. Res. 171(2):557–566, 2006) presented a production-inventory system for deteriorating items with demand rate being a linearly ramp type function of time and production rate being proportional to the demand rate. The two models without shortages and with shortages were discussed. Both models were studied assuming that the time point at which the demand is stabil...

Hard metals are an important material due to their specific properties, such as high degree of hardness and resistance to abrasive wear, and they are in wide use today. There are indications that hard metal aerosols can endanger human health. Discussions are ongoing as to how to categorize hard metals as hazardous as a result. This categorization will require deciding in particular how to deter...

— This paper investigates intermediate input effects and labor pooling in the context of urban informality, examining the handicraft industry of Nairobi, Kenya. The paper tests if conditions found in informality interfere with transition pathways in production clusters. 102 semi-structured interviews were conducted with industry participants, including 69 production firms. Findings confirm the ...

Over the years, the hot air solder leveling (HASL) process has been established as a primary surface finish for circuit boards. It still remains the most solderable, and arguably the most durable, surface finish. Recent developments in PCB manufacturing have highlighted some problems with these finishes, creating an urgent need for solderable, durable, and inexpensive alternative surface finish...

Introduction: orthodontic tooth alignment and leveling are usually the first two stages when an orthodontic treatment is to be initiated. The process of alignment is accomplished by uncontrolled tipping of teeth into a smooth arch and the process of leveling is accomplished by intrusion or extrusion of the teeth so that the upper and lower teeth come together. The aim of this study was to find ...

To address the issues that arise when auto-leveling vehicle body of a hillside tractor under complex working conditions, an control system was developed based on newly and four-point leveling mechanism. In this approach, accuracy stability were improved by adopting sliding mode variable structure algorithm fuzzy switching gain adjustment to achieve real-time dynamic control. obtain curves front...

This paper presents a case study of an implementation of a new method for Production Leveling designed for batch production. It includes prioritizing criteria of products and level production plan. Moreover, it was applied on a subsidiary of a multinational enterprise located on Brazil, which manufacturing processes comprise batch production in a make-to-stock policy. Regarding a qualitative as...

It is common knowledge that the alignment condition of rotating machinery affects the equipment's vibration levels and long term reliability, but there is little quantitative information relating the amount of misalignment to the degrading affects of misalignment. Many earlier publications state two reasons for performing precision alignments: 1. improved electrical efficiency and 2. reduced ma...