Innovativer Energiespeicher Bundeswasserstraßen

The present analysis provides a contribution to the question of how a system integration of large-scale energy storages can be implemented. It is to be investigated if and how federal waterways can be used for this purpose. Initially, a baseline study was carried out in which the federal waterways are systematically assessed with regard to their suitability for/as energy storage systems. Apart from the technical and the hydro mechanical implementation of the storage process, the advantages and disadvantages of the federal waterways in comparison to conventional pump storage stations play a significant role. A presentation and classification of the potentially available canal sections provides an overview of the suitable storage systems of the federal waterways. A specifically designed storage simulation on the basis of a sample application is used, in order to determine the capacity of the canal system for energy storage. Consequently, the simulation showed the theoretical capability of the federal waterways as energy storage systems, through their ability to balance the load and temporal fluctuations of the energy input. The simulation program Matlab was used on the basis of the synthetic load and delivery profiles. Finally, based on the example of the ships lock in Uelzen and the Scharnebeck boats lift, a simulation of the possible re-equipping options will be described, technically abstracted, economically analysed and combined with renewable energy facilities within a virtual power plant. The detailed formulation of further approaches and the calculation of possible application scenarios play a central role within this analysis.     

MARKET TRANSACTIONS IN THE NATIONAL ACCOUNTS

This paper explains the treatment of market and non-market transactions in the national accounts. Different possibilities of defining these two types of transactions are discussed, and it becomes evident that a strong restriction of national accounts to market transactions only cannot be seriously taken into consideration. On the other hand, a system of supplementary tables is proposed which shows the market and the non-market transactions as such. Examples of tables of this kind are presented for the Federal Republic of Germany.     

PUBLIC GOODS,RENT DISSIPATION,AND CANDIDATE COMPETITION*

The early literature on rent seeking presumed that total expenditures in the rent-seeking process would equal the value of a contested prize. Subsequent analysis has shown, however, that a number of circumstances give rise to underdissipation of the contested rent—imperfectly discriminating contests, risk-aversion, or where individuals' valuations of the prize are not identical. This paper shows how underdissipation is associated with the public-good character of contested rents. In particular, total rent dissipation is demonstrated to be less than the average stake of the individual contenders. In addition to assessing rent dissipation in contests for public-good allocations, the paper also endogenizes the value of the prize by placing the rent-seeking contest in a setting of candidate competition.     

UNCTAD VII-what is really at stake

The seventh United Nations Conference on Trade and Development will be held in Geneva in July 1987. Heinrich Dehn reviews the issues on the agenda and shows where the policies of the industrialised and developing countries need to be revised.     

Quantifying shifts in primary factor demand in the South African economy

This article uses a dynamic computable general equilibrium model to explain the persistence in the high levels of unemployment in the South African economy in spite of modest to relatively strong output growth. We make use of a historical simulation for the period 2006–13 and find that the capital–labour ratio increased despite a relative increase in the rental price of capital. Classical economic theory suggests that changes in industry preferences toward capital and labour lead to adjusted capital–labour ratios. We quantify the changes in industry factor preferences during this period and highlight their impact in explaining observed labour market outcomes. Other changes in the economy over this period are also quantified.     

Integrative retail logistics: An exploratory study

Grocery retail companies have gone through a transformational change in the past by heavily investing in distribution centers of their own and by expanding their logistics activities. As a result, many retailers are now in the process of better adjusting their logistics operations to their specific requirements against the backdrop of raising pressure in a highly competitive environment. In this light, we provide an exploratory study based on semi-structured face-to-face interviews with 28 leading European grocery retailers. First we examine the current strategic designs of grocery retailers’ internal logistics networks. Next, we shift our focus to the resulting interdependencies in tactical supply chain planning between instore operations and upstream logistics processes. We have identified five interdependent planning issues: order packaging unit, store delivery pattern, store replenishment lead time, store delivery arrival times and arrival time windows, as well as roll-cage sequencing and loading carriers. Each of these mid-term planning interdependencies is evaluated with regard to implications in the stores, in transportation and in the distribution centers. The mid-term operations planning issues in the grocery retail industry considered in this paper have remained practically unexplored up to now. The outcome of this empirical research study therefore has substantial relevance for future retail research and practice.