An Integrated Model for Dimensioning the Reserve Fleet based on the Maintenance Policy

Usually, the Reserve Fleet, or Spare Fleet, of passenger urban buses, is based on indicators used in some international relevant companies and extrapolated for many others, almost as a dogma. However, it must be taken into consideration pragmatic variables intrinsic to the buses namely their maintenance and in a more pragmatic approach, indexing their availability and by consequence the reserve fleet indexed to the maintenance policy used in each company. The paper discusses these subjects and presents a global model that integrates the maintenance planning policy, based on a condition monitoring model, maintenance Key Maintenance Indicators (KPI), and an economic life cycle model. The paper presents some results based both in theoretical considerations and also in real data from an urban fleet of a European Countr

Economic Life Cycle of Biomass Equipment and its Renovation

The main goal of this article is to determine the optimal time period of boiler for biomass renewal, because its usage affects the financial situation of the firm in the form of costs. In this contribution is applied the method of operational research - the method of optimal time of machine renovation. The results of the analyses point to the optimal period of biomass boiler renovation before its service life in the 11th year. Operating costs are increasing about 9% after this time. By using this model there is ability to plan financial sources for buying new biomass boiler at 5500-15600€ on the market. The scientific benefit lies in the fact that the model is applicable to all types of equipment and machinery, in various industrial areas and in services and it is preventive instrument for financial planning for machine renovation.

On Models of Funding the Lifecycle Deficit

The article elaborates on the macro-analysis as related to the aggregated National Transfer Accounts (NTA), the topic originated in the prior publications in Voprosy Statistiki journal (Issues 4 and 11 of 2019), and builds upon the research conducted by HSE National Research University in 2020 as part of Russia’s participation in the global National Transfer Accounts project. The author explored various models of funding the economic life cycle deficit (various support system), adopted by separate groups of economies, through the lens of population savings in these countries. The article was profoundly examined how “excessive” household consumption is supported by public transfers and the correlation between the scale of such transfers and the household sector’s appetite for savings. By taking this research angle, the author aimed to develop deeper understanding of the underlying forces that drive savings into investments within the household sector. The author summarized key parameters of aggregated NTA for Russia in 2017–2019 to produce early quantitative assessments of the deficit funding structure. A closer look into relations between the funding models and incomes saved by population allowed to make cross-country comparisons and map Russia in global environment. The article discussions will be useful to the readers with an interest in demographic studies and socio-economics.