Biofiltration of methane using an inorganic filter bed: Influence of inlet load and nitrogen concentrationThis article is one of a selection of papers published in this Special Issue on Biological Air Treatment.

2009 ◽  
Vol 36 (12) ◽  
pp. 1903-1910 ◽  
Author(s):  
Josiane Nikiema ◽  
Matthieu Girard ◽  
Ryszard Brzezinski ◽  
Michèle Heitz
Keyword(s):  
Nutrient Solution ◽  
Nitrogen Concentration ◽  
Filter Material ◽  
Optimum Level ◽  
Special Issue ◽  
Air Treatment ◽  
Maximum Elimination Capacity ◽  
Filter Bed ◽  
Selection Of

An upflow lab-scale biofilter was operated with an inorganic filter material to control methane emissions. The influence of the inlet load on methane removal was investigated and the maximum elimination capacity obtained was 36 g/(m3·h) for an inlet load of 95 g/(m3·h). The influence of the nitrogen concentration, which was provided in the form of nitrate through a nutrient solution, was also determined. We established that the optimum nitrogen concentration required for biofilter operation decreases with the methane inlet load. In fact, it was around 0.75 g/L for inlet loads comprised between 55 and 95 g/(m3·h) and of 0.50 g/L when the inlet load was comprised between 20 and 55 g/(m3·h). During this study, a nitrogen concentration of 1.00 g/L inhibited methane removal in the biofilter. In addition, the use of a nitrogen concentration superior to its optimum level can cause, in the long-term run, severe damages to the biofilter performance.

Characterization techniques of packing material colonization in gas biofiltration processesThis article is one of a selection of papers published in this Special Issue on Biological Air Treatment.

2009 ◽  
Vol 36 (12) ◽  
pp. 1895-1902 ◽  
Author(s):  
Yves Andres ◽  
Eric Dumont ◽  
Claire Gerente
Keyword(s):  
Development Process ◽  
Packing Material ◽  
Main Research ◽  
Air Treatment ◽  
Cell Biomass ◽  
Pollutant Concentrations ◽  
Filter Bed ◽  
Air Streams ◽  
Research Domains ◽  
Selection Of

Biological air treatment is largely used for the decontamination of large air streams with low pollutant concentrations. As a result of microbial metabolism, the pollutants are degraded into carbon dioxide and water or converted into cell biomass. Three main research domains have emerged within the field of biofiltration: filter bed development, process optimization, and microbiological studies (community, nutrients, …). The objective of this paper is to focus on the microbial activities in air biofiltration processes. The nutrient contribution and the packing material effects are described. Special attention is paid to the description of techniques for the characterization and identification of the microbial population.

Waste gas treatment in bioreactors: environmental engineering aspectsThis article is one of a selection of papers published in this Special Issue on Biological Air Treatment.

2009 ◽  
Vol 36 (12) ◽  
pp. 1887-1894 ◽  
Author(s):  
Christian Kennes ◽  
María Montes ◽  
M. Estefanía López ◽  
María C. Veiga
Keyword(s):  
Environmental Engineering ◽  
Special Issue ◽  
Stirred Tank Bioreactor ◽  
Gas Treatment ◽  
Waste Gas ◽  
Air Treatment ◽  
Recent Developments ◽  
Waste Gas Treatment ◽  
Phase Systems ◽  
Selection Of

This paper gives an overview of the most important bioreactor configurations used in waste gas treatment, i.e., conventional and trickling biofilters, the bioscrubber, suspended-growth bioreactors, as well as two-liquid phase systems (stirred tank bioreactor and biotrickling filter). The historical evolution, main characteristics, and recent developments are described in each case.

Simulating long-term river morphodynamics at watershed scaleThis paper is one of a selection of papers in this Special Issue in honour of Professor M. Selim Yalin (1925–2007).

2009 ◽  
Vol 36 (10) ◽  
pp. 1680-1688 ◽  
Author(s):  
Giampaolo Di Silvio
Keyword(s):  
Quasi Equilibrium ◽  
Watershed Scale ◽  
Special Issue ◽  
Quantitative Criterion ◽  
Equilibrium Conditions ◽  
Traditional Practice ◽  
River Reach ◽  
Theoretical Considerations ◽  
Selection Of

It has been a traditional practice of fluvial engineers to apply the uniform water-flow hypothesis to real rivers by averaging the geometric and hydraulic quantities over appropriate portions of the river reach. No quantitative criterion, however, was applied to assess the validity and limitations of this procedure. The present paper collects a number of theoretical considerations and relevant observations (developed in the framework of two recent doctoral theses) that are quite useful for selecting the approximated model most suitable for studying morphodynamic problems at watershed scale. Particularly efficient for this analysis has been consideration of the river in quasi-equilibrium conditions.

Introduction: Affixes and bases

2011 ◽  
Vol 4 (2) ◽  
pp. 161-168
Author(s):  
Stela Manova
Keyword(s):  
Special Issue ◽  
Affix Order ◽  
Selection Of ◽  
Affix Ordering

This special issue includes a selection of papers presented at the 2nd Vienna Workshop on Affix Order held in Vienna, Austria on June 4–5, 2009. The workshop was in honor of Wolfgang U. Dressler on the occasion of his 70th birthday. However, this special issue differs from the classical Festschrift dedicated to a renowned scholar and is ‘more special’ in two respects at least: 1) not all authors are Dressler's friends and colleagues, some of them are only indirectly related to him, through his students; and 2) since the papers were presented at a topic-oriented workshop, they are thematically uniform. In other words, this special issue is a kind of scientific genealogy in terms of affix ordering. Thus, the title Affixes and bases should be understood in two ways: literally – affixes and bases as linguistic notions, and metaphorically – affixes and bases as linguists related directly and indirectly to a prominent base: Wolfgang U. Dressler.

Women's Participation in Politics: Ukrainian Case

2014 ◽  
Vol 2013 (3) ◽  
pp. 53-66
Author(s):  
Skovikov Alexey
Keyword(s):  
Political Culture ◽  
Separation Of Powers ◽  
Party Competition ◽  
Political Life ◽  
Ruling Class ◽  
Political Actors ◽  
Women's Participation ◽  
Democratic Transformation ◽  
Selection Of

AbstractThe international practices takes into account the question of women's participation in the political life of modern Ukraine. The selection of the state was due to the dynamic process of democratic transformation - the separation of powers, the formation of multi-party competition among political actors in the electoral process, the activity women in the various institutions of civil society. The position was claimed on the basis of empirical data range of academic institutions and reputable sociological centers, and also interviews with experts who said that the creation of real conditions for self-realization by women's interest in politics is only possible for long term. The process is controversial and caused by political culture, traditions and interests of the ruling class represented mainly by men.

Evidence for a single mechanism gating perceptual and long-term memory information into working memory

2020 ◽  
Author(s):  
Sam Verschooren ◽  
Yoav Kessler ◽  
Tobias Egner
Keyword(s):  
Working Memory ◽  
Long Term Memory ◽  
Sources Of Information ◽  
Term Memory ◽  
Source Selection ◽  
Single Mechanism ◽  
Gating Mechanism ◽  
Opening And Closing ◽  
Selection Of

An influential view of working memory (WM) holds that its’ contents are controlled by a selective gating mechanism that allows for relevant perceptual information to enter WM when opened, but shields WM contents from interference when closed. In support of this idea, prior studies using the reference-back paradigm have established behavioral costs for opening and closing the gate between perception and WM. WM also frequently requires input from long-term memory (LTM), but it is currently unknown whether a similar gate controls the selection of LTM representations into WM, and how WM gating of perceptual vs. LTM sources of information relate to each other. To address these key theoretical questions, we devised a novel version of the reference-back paradigm, where participants switched between gating perceptual and LTM information into WM. We observed clear evidence for gate opening and closing costs in both cases. Moreover, the pattern of costs associated with gating and source-switching indicated that perceptual and LTM information is gated into WM via a single gate, and rely on a shared source-selection mechanism. These findings extend current models of WM gating to encompass LTM information, and outline a new functional WM architecture.

tti2002: Introduction and Conference Overview

2003 ◽  
Vol 17 (1) ◽  
pp. 9-14 ◽  
Author(s):  
E. H. Robson
Keyword(s):  
Higher Education ◽  
Technology Transfer ◽  
Special Issue ◽  
International Convention ◽  
International Conference ◽  
Introductory Paper ◽  
Personal Reflections ◽  
Selection Of

This special issue of Industry and Higher Education is devoted to a selection of papers and reports from tti2002, an international conference on technology transfer and innovation held at the International Convention Centre, Birmingham, UK in July 2002. In this introductory paper, the author provides the context of the conference, summarizes the presentations given by invited speakers and offers personal reflections on the event.

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