The Determination of Moisture Stability of a Dynamic System Under Different Environmental Conditions

2009 ◽  
pp. 13-13-5
Author(s):  
KS Marsh ◽  
T Ambrosio ◽  
DM Guazzo
Keyword(s):  
Dynamic System ◽  
Environmental Conditions ◽  
Moisture Stability

scholarly journals Phylogenetic Core Groups: a promising concept in search of a consistent methodological framework

Microbiome ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Alberto Pascual-García
Keyword(s):  
Microbial Communities ◽  
Microbial Ecology ◽  
Environmental Conditions ◽  
The Novel ◽  
Methodological Framework ◽  
Operational Taxonomic Units ◽  
Traditional Classification ◽  
Taxonomical Classification ◽  
Novel Concept

AbstractIn this comment, we analyse the conceptual framework proposed by Aguirre de Cárcer (Microbiome 7:142, 2019), introducing the novel concept of Phylogenetic Core Groups (PCGs). This notion aims to complement the traditional classification in operational taxonomic units (OTUs), widely used in microbial ecology, to provide a more intrinsic taxonomical classification which avoids the use of pre-determined thresholds. However, to introduce this concept, the author frames his proposal in a wider theoretical framework based on a conceptualization of selection that we argue is a tautology. This blurs the subsequent formulation of an assembly principle for microbial communities, favouring that some contradictory examples introduced to support the framework appear aligned in their conclusions. And more importantly, under this framework and its derived methodology, it is not possible to infer PCGs from data in a consistent way. We reanalyse the proposal to identify its logical and methodological flaws and, through the analysis of synthetic scenarios, we propose a number of methodological refinements to contribute towards the determination of PCGs in a consistent way. We hope our analysis will promote the exploration of PCGs as a potentially valuable tool, helping to bridge the gap between environmental conditions and community composition in microbial ecology.

Performances of the Radiello diffusive sampler for BTEX measurements: Influence of environmental conditions and determination of modelled sampling rates

2005 ◽  
Vol 39 (14) ◽  
pp. 2535-2544 ◽  
Author(s):  
A PENNEQUINCARDINAL ◽  
H PLAISANCE ◽  
N LOCOGE ◽  
O RAMALHO ◽  
S KIRCHNER ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Diffusive Sampler

scholarly journals Modeling of diversification of foreign economic interactions

2018 ◽  
Vol 16 (1) ◽  
pp. 155-165
Author(s):  
Ihor Hroznyi ◽  
Oleh Kuzmak ◽  
Olena Kuzmak ◽  
Olha Rusinova
Keyword(s):  
Dynamic System ◽  
Simulation Model ◽  
Mutual Influence ◽  
Model Development ◽  
Complex Dynamic ◽  
Complex Dynamic System ◽  
World Markets ◽  
Economic Interactions ◽  
Simulation Package

The article developed a basic simulation model of diversification of foreign economic interactions, which makes it possible to assess the mutual influence of key economic indicators and their reaction to changes in the equilibrium in world markets. The peculiarity of the developed model of diversification of foreign economic interactions is its functioning as a complex dynamic system in which many factors are interrelated, and the connections are dynamic. This makes it possible to calculate a simulation model that takes into account hidden and subtle connections. While modeling foreign economic interactions and evaluating the influence of various regulators on them, in addition to the stage of model development itself, mandatory parameterization of this model is proposed, that is, the determination of specific types of dependence between the factors included in the model and the parameters of these dependencies. The implementation of this model can be carried out in any simulation package.

scholarly journals Peat decomposition – shaping factors, significance in environmental studies and methods of determination; a literature review

Geologos ◽  
2016 ◽  
Vol 22 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Danuta Drzymulska
Keyword(s):  
Chemical Composition ◽  
Literature Review ◽  
Ground Water ◽  
Environmental Conditions ◽  
Meteoric Water ◽  
Climatic Conditions ◽  
Review Of Literature ◽  
Forming Process ◽  
Physical And Chemical

Abstract A review of literature data on the degree of peat decomposition – an important parameter that yields data on environmental conditions during the peat-forming process, i.e., humidity of the mire surface, is presented. A decrease in the rate of peat decomposition indicates a rise of the ground water table. In the case of bogs, which receive exclusively atmospheric (meteoric) water, data on changes in the wetness of past mire surfaces could even be treated as data on past climates. Different factors shaping the process of peat decomposition are also discussed, such as humidity of the substratum and climatic conditions, as well as the chemical composition of peat-forming plants. Methods for the determination of the degree of peat decomposition are also outlined, maintaining the division into field and laboratory analyses. Among the latter are methods based on physical and chemical features of peat and microscopic methods. Comparisons of results obtained by different methods can occasionally be difficult, which may be ascribed to different experience of researchers or the chemically undefined nature of many analyses of humification.

Determination of Optimum Instances and Duration of Rest Periods for Strenuous Manual Work

1978 ◽  
Vol 22 (1) ◽  
pp. 22-22
Author(s):  
Dileep R. Sule
Keyword(s):  
Environmental Conditions ◽  
Manual Work ◽  
Rest Periods ◽  
Hours Of Work ◽  
The Hours ◽  
Rest Breaks

Since the beginning of recorded history, man has been concerned about work-rest cycles. Studies of industrial fatigue date back to 1893 when the hours of work were reduced from 54 to 48 hours a week. Further reductions have brought us to a 40-hour work week with five days of work and two days of rest. Management recognizes the value of rest breaks and normally provides these in accordance with the type labor performed and environmental conditions.

A Method Using Liquid-Liquid Microextraction in a Dynamic System for Preconcentration and Determination of Lead in Food Samples

2016 ◽  
Vol 227 (5) ◽  
Author(s):  
Rebeca Moraes Menezes ◽  
Rafael Vasconcelos Oliveira ◽  
Djalma Menezes de Oliveira ◽  
Valfredo Azevedo Lemos
Keyword(s):  
Dynamic System ◽  
Food Samples ◽  
Liquid Microextraction
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