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  Subjects -> NUTRITION AND DIETETICS (Total: 201 journals)
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DEMETRA : Alimentação, Nutrição & Saúde
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  This is an Open Access Journal Open Access journal
ISSN (Print) 2238-913X
Published by Universidade do Estado do Rio de Janeiro Homepage  [43 journals]
  • Editorial to Volume 37(2)

    • Authors: Jaco Visagie
      PubDate: 2021-12-21
      DOI: 10.5784/37-2-709
      Issue No: Vol. 37, No. 2 (2021)
  • Content and Access Provision in a Discrete Competition Model

    • Authors: Petrus Potgieter, Bronwyn Howell
      Pages: 54–7 - 54–7
      Abstract: The non-rival, non-excludable and infinitely expansible characteristics of digital goods with marginal cost of zero strongly favours the use of bundling strategies. Theoretical tractability requires most models in the current literature to make highly stylized assumptions, rarely observed or anticipated in the real-life situations, motivating inquiry. This paper considers a competition model in which: * the firms, consumers and differentiated products are finite in number; * prices are discrete and not continuous; * consumers may purchase multiple items in a single product category where the degree of complementarity or substitutability of the product categories can also vary across consumers; and * where consumer-specific cost savings are obtained when purchasing multiple items from the same firm. Approximate solutions are obtained through numerical simulation. Firms act in concert to maximise the total firm revenue. Our main finding is that the interplay between maximal firm revenue, consumer surplus and prices is very complex and that high firm revenue and high consumer surplus are not antithetic. It suggests also that consumer surplus and market concentration are not necessarily related. Many market outcomes that are observed may be due to chance rather than design as diverse outcomes can accompany situations that are, to the firms, difficult to distinguish.
      PubDate: 2021-12-21
      DOI: 10.5784/37-2-704
      Issue No: Vol. 37, No. 2 (2021)
  • Energy Analysis via Value Stream Mapping

    • Authors: Keshav Ramsunder, Oludolapo Olanrewaju
      Pages: 77–9 - 77–9
      Abstract: Over the past few decades, Lean Manufacturing (LM) has been the pinnacle of strategies applied for cost and waste reduction. However as the search for competitive advantage and production growth continues, there is a growing consciousness towards environmental preservation. With this consideration in mind this research investigates and applies Value Stream Mapping (VSM) techniques to aid in reducing environmental impacts of manufacturing companies. The research is based on empirical observation within the Chassis weld plant of Company X. The observation focuses on the weld operations and utilizes the cross member line of Auxiliary Cross as a point of study. Using various measuring instruments to capture the emissions emitted by the weld and service equipment, data is collected. The data is thereafter visualised via an Environmental Value Stream Map (EVSM) using a 7-step method. It was found that the total lead-time to build an Auxiliary Cross equates to 16.70 minutes and during this process  is emitted. It was additionally found that the UPR x LWR stage of the process indicated both the highest cycle time and carbon emissions emitted and provides a starting point for investigation on emission reduction activity. The EVSM aids in the development of a method that allows quick and comprehensive analysis of energy and material flows. The results of this research are important to practitioners and academics as it provides an extension and further capability of Lean Manufacturing tools. Additionally, the EVSM provides a gateway into realising environmental benefits and sustainable manufacturing through Lean Manufacturing.
      PubDate: 2021-12-21
      DOI: 10.5784/37-2-688
      Issue No: Vol. 37, No. 2 (2021)
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