scholarly journals Pairwise difference regressions are just weighted averages

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Carlos Góes
Keyword(s):  
Weighted Averages

scholarly journals Vital Factors Stimulating Development and Competitiveness of Design and Construction Enterprises of Photovoltaic Farms

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3399
Author(s):  
Robert Kuceba ◽  
Grzegorz Chmielarz ◽  
Marcin Soltysiak
Keyword(s):  
Construction Projects ◽  
Renewable Energy Sources ◽  
Research Process ◽  
Scientific Discourse ◽  
Energy Markets ◽  
Quantitative Criterion ◽  
Strategic Objectives ◽  
Weighted Averages ◽  
Construction Enterprises ◽  
Design And Construction

The underlying objective of the paper is to identify and evaluate in the research process vital factors that impact the development of design and construction enterprises of photovoltaic farms on the energy markets, in particular narrowed down to renewable energy sources (RES) markets, including energy coming from photovoltaic sources. The first part of the paper, the epistemological one, introduces a scientific discourse pertaining to conditionings and restrictions related to RES markets in the dimensions of sustainable development. This has been done with the use of literature query, legislative and administrative acts, and reports drawn up for the European Commission. In this reference, we summarized the EU’s essential measures aimed at promoting the idea of sustainability. The second part of the paper, the empirical one, presents a summary of the results obtained within the research pertaining to “opportunities and threats in managing projects of photovoltaic farms in production enterprises of energy appliances”. The research was conducted in a group of 24 design and construction enterprises of photovoltaic farms. The concentration of the research, in the context of the underlying objective of this paper, pertained to the aggregation and evaluation of selected factors that stimulate the development and competitiveness of construction projects and the implementation of photovoltaic farms. We considered the hierarchy of strategic objectives of the investigated enterprises and selected threats to their market position. Two primary criteria were adopted to aggregate and evaluate vital factors that impact the development of design and construction enterprises of PV farms. The first of them is the qualitative one—top scores, weighted averages of respondent evaluations on the five-point Likert scale. The second one is the quantitative criterion—number of indications N ≥ 22 of the respondents (over 90%). A measurable value of the paper is the scientific discourse pertaining to dimensions of competitiveness of the investigated and analyzed enterprises on the RES market, in particular narrowed down to photovoltaic farms.

Respiratory development in Arctic char Salvelinus alpinus under conditions of normoxia and chronic hypoxia

1977 ◽  
Vol 55 (9) ◽  
pp. 1461-1467 ◽  
Author(s):  
D. G. McDonald ◽  
B. R. McMahon
Keyword(s):  
Heart Rate ◽  
Surface Morphology ◽  
Chronic Hypoxia ◽  
Prolonged Exposure ◽  
Salvelinus Alpinus ◽  
Ventilation Rate ◽  
Arctic Char ◽  
Adult Fish ◽  
Weighted Averages ◽  
Secondary Lamellae

Changes in surface morphology of the gills, ventilation rate, and heart rate were examined in Arctic char larvae exposed to normoxia (pO2 = 121 ± 6 (SE) mmHg) or chronic hypoxia (pO2 = 33 ± 3.5 mmHg) for 47 days after hatching. A modified weighted-averages technique was developed to measure aspects of gill morphology.Early development of the gills was characterized by rapid increases in filament size and number, and the emergence and proliferation of secondary lamellae. Variations in the dimensions of the gills, as noted in adult fish, were particularly evident in the larval fish.Hypoxia caused increases in both ventilation rate and heart rate. Prolonged exposure led to a retardation of gill growth, particularly the proliferation of secondary lamellae. However, growth of individual lamellae was stimulated between 38 and 47 days.

scholarly journals Asymptotic Properties of Longitudinal Weighted Averages for Strongly Mixing Data

2017 ◽  
Vol 9 (2) ◽  
pp. 65
Author(s):  
Brahima Soro ◽  
Ouagnina Hili ◽  
Sophie Dabo- Niang
Keyword(s):  
Covariance Function ◽  
Asymptotic Properties ◽  
Random Variable ◽  
Weighted Averages ◽  
Strongly Mixing

We present general results of consistency and normality of a real-valued longitudinal random variable. We suppose that this random variable is some formed weighted averages of alpha-mixing data. The results can be applied to within-subject covariance function.

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