Batch experiment on H2S degradation by bacteria immobilised on activated carbons

2004 ◽  
Vol 50 (4) ◽  
pp. 299-308 ◽  
Author(s):  
R. Yan ◽  
Y.L. Ng ◽  
X.G. Chen ◽  
A.L. Geng ◽  
W.D. Gould ◽  
...  
Keyword(s):  
Activated Carbons ◽  
Enrichment Culture ◽  
Future Research ◽  
Support Material ◽  
Support Materials ◽  
Biological Treatments ◽  
Pore Blockage ◽  
The Media ◽  
Biofilm Development ◽  
Optimum Balance

Biological treatments of odorous compounds, as compared to chemical or physical technologies, are in general ecologically and environmentally favourable. However, there are some inefficiencies relative to the media used in biofiltration processes, such as the need for an adequate residence time; the limited lifetime, and pore blockage of media, which at present render the technology economically non-viable. The aim of the study is to develop novel active media to be used in performance-enhanced biofiltration processes, by achieving an optimum balance and combination of the media adsorption capacity with the biodegradation of H2S through the bacteria immobilised on the media. An enrichment culture was obtained from activated sludges in order to metabolise thiosulphate. Batch-wise experiments were conducted to optimise the bacteria immobilisation on activated carbon, so as to develop a novel “biocarbon”. Biofilm was mostly developed through culturing the bacteria with the presence of carbons in mineral media. SEM and BET tests of the carbon along with the culturing process were used to identify, respectively, the biofilm development and biocarbon porosity. Breakthrough tests evaluated the biocarbon performance with varying gas resistance time, inlet H2S concentration, and type of support materials. Fundamental issues were discussed, including type of support material, mode of bacteria immobilisation, pore blockages, and biodegradation kinetics, etc. This batch-wise study provides a basis for our future research on optimisation of the biofiltration process using a bio-trickling reactor.

Employing Exfoliated Graphite as Novel Support Material for Heterogeneous Model Catalysts

2019 ◽  
Author(s):  
Moritz Wolf ◽  
Nico Fischer ◽  
Michael Claeys
Keyword(s):  
Surface Area ◽  
Graphite Powder ◽  
Model Catalysts ◽  
Model Systems ◽  
Exfoliated Graphite ◽  
Support Material ◽  
Heterogeneous Model ◽  
Support Materials ◽  
Metal Support Interaction ◽  
Catalyst Systems

<p>The inert nature of graphitic samples allows for characterisation of rather isolated supported nanoparticles in model catalysts, as long as sufficiently large inter-particle distances are obtained. However, the low surface area of graphite and the little interaction with nanoparticles result in a challenging application of conventional preparation routes in practice. In the present study, a set of graphitic carbon materials was characterised in order to identify potential support materials for the preparation of model catalyst systems. Various sizes of well-defined Co<sub>3</sub>O<sub>4</sub> nanoparticles were synthesised separately and supported onto exfoliated graphite powder, that is graphite after solvent-assisted exfoliation <i>via</i> ultrasonication resulting in thinner flakes with increased specific surface area. The developed model catalysts are ideally suited for sintering studies of isolated nano-sized cobaltous particles as the graphitic support material does not provide distinct metal-support interaction. Furthermore, the differently sized cobaltous particles in the various model systems render possible studies on structural dependencies of activity, selectivity, and deactivation in cobalt oxide or cobalt catalysed reactions.</p>

Influence of Seeding Conditions on Initial Biofilm Development during the Startup of Anaerobic Fluidized Bed Reactors

1989 ◽  
Vol 21 (4-5) ◽  
pp. 157-165 ◽  
Author(s):  
F. Ehlinger ◽  
J. M. Audic ◽  
G. M. Faup
Keyword(s):  
Fluidized Bed ◽  
Future Development ◽  
Protein Concentration ◽  
Specific Activity ◽  
Fluidized Bed Reactor ◽  
Fluidized Bed Reactors ◽  
Support Material ◽  
Biofilm Development ◽  
Initial Biofilm

The characterization of the biofilm of an anaerobic fluidized-bed reactor was completed under standard conditions. The distribution of the fixed protein concentration depended on the level in the reactor. The protein concentration reached 1520 µg.g−1 of support at the top of the reactor and only 1200 µg.g−1 at the bottom after 504 hours of operation but the specific activity of the biofilm was 33×10−4 µM acetate.h−1.mg−1 proteins at the bottom and only 26×10−4 µM.h−1.mg−1 at the top. The efficiency of a fluidized bed reactor and the composition of the biofilm changed with an increase of the pH from 7 to 8.5 during the seeding of the support material. Future development of the biofilm and the specific activity of the support were affected.

A Downward Spiral? A Panel Study of Misinformation and Media Trust in Chile

2021 ◽  
pp. 194016122110252
Author(s):  
Sebastián Valenzuela ◽  
Daniel Halpern ◽  
Felipe Araneda
Keyword(s):  
News Media ◽  
Panel Study ◽  
Future Research ◽  
Panel Survey ◽  
Downward Spiral ◽  
The Media ◽  
Media Trust ◽  
People’S Attitudes ◽  
Over Time

Despite widespread concern, research on the consequences of misinformation on people's attitudes is surprisingly scant. To fill in this gap, the current study examines the long-term relationship between misinformation and trust in the news media. Based on the reinforcing spirals model, we analyzed data from a three-wave panel survey collected in Chile between 2017 and 2019. We found a weak, over-time relationship between misinformation and media skepticism. Specifically, initial beliefs on factually dubious information were negatively correlated with subsequent levels of trust in the news media. Lower trust in the media, in turn, was related over time to higher levels of misinformation. However, we found no evidence of a reverse, parallel process where media trust shielded users against misinformation, further reinforcing trust in the news media. The lack of evidence of a downward spiral suggests that the corrosive effects of misinformation on attitudes toward the news media are less serious than originally suggested. We close with a discussion of directions for future research.

Alcohol and the Media: A Review and Critique of the ‘Effects’ Model

1982 ◽  
Vol 3 (2) ◽  
pp. 183-194 ◽  
Author(s):  
Nicholas Dorn ◽  
Nigel South
Keyword(s):  
Point Of View ◽  
Economic Consequences ◽  
Future Research ◽  
General Level ◽  
Alcohol Advertising ◽  
Social Drinking ◽  
The Media ◽  
Quantitative Changes ◽  
And Shifts ◽  
Qualitative Changes

A review of the available empirical material bearing upon the question of alcohol advertising having ‘effects’ on the general level of consumption suggests that this question is insufficiently precise as a basis for research. Studies suggesting some relationship between advertising for particular brands or products and shifts in brand or product use are potentially more interesting, if considered from a point of view that recognises that such shifts may involve shifts in milieux, comparisons, styles and meanings associated with consumption. Future research should be attentive to such qualitative changes in drinking practices attendant upon advertising or preventive campaigns (as well as to quantitative changes). The authors suggest that such quantitative and qualitative changes in drinking practices of individuals and social groups need to be considered within the context of more general, ideological and economic, consequences of alcohol advertising. These consequences-including reinforcement of images about ‘social drinking,’ and shifting of consumers onto more profitable products-consolidate the profitability of the alcohol industry (a consideration more important to the industry than levels of consumption per se). A framework broader than that of ‘effects’ on individuals' levels of consumption is required if health educators are to learn anything from advertising.

scholarly journals Perception of Gamblers: A Systematic Review

2021 ◽  
Author(s):  
Andrea Wöhr ◽  
Marius Wuketich
Keyword(s):  
Systematic Review ◽  
Empirical Studies ◽  
Grey Literature ◽  
Future Research ◽  
Gambling Problems ◽  
Negative Effects ◽  
Strong Focus ◽  
The Media ◽  
Social Scientific ◽  
Psychological Knowledge

AbstractIt is generally assumed that gamblers, and particularly people with gambling problems (PG), are affected by negative perception and stigmatisation. However, a systematic review of empirical studies investigating the perception of gamblers has not yet been carried out. This article therefore summarises empirical evidence on the perception of gamblers and provides directions for future research. A systematic literature review based on the relevant guidelines was carried out searching three databases. The databases Scopus, PubMed and BASE were used to cover social scientific knowledge, medical-psychological knowledge and grey literature. A total of 48 studies from 37 literature references was found. The perspective in these studies varies: Several studies focus on the perception of gamblers by the general population, by subpopulations (e. g. students or social workers), or by gamblers on themselves. The perspective on recreational gamblers is hardly an issue. A strong focus on persons with gambling problems is symptomatic of the gambling discourse. The analysis of the studies shows that gambling problems are thought to be rather concealable, whereas the negative effects on the concerned persons‘ lives are rated to be quite substantial. PG are described as “irresponsible” and “greedy” while they perceive themselves as “stupid” or “weak”. Only few examples of open discrimination are mentioned. Several studies however put emphasis on the stereotypical way in which PG are portrayed in the media, thus contributing to stigmatisation. Knowledge gaps include insights from longitudinal studies, the influence of respondents‘ age, culture and sex on their views, the relevance of the type of gambling a person is addicted to, and others. Further studies in these fields are needed.

scholarly journals Advertising at the threshold: Paratextual promotion in the era of media convergence

2018 ◽  
Vol 19 (2) ◽  
pp. 195-215 ◽  
Author(s):  
Chris Hackley ◽  
Amy Rungpaka Hackley
Keyword(s):  
Mass Media ◽  
Analytical Framework ◽  
Product Placement ◽  
Future Research ◽  
Media Convergence ◽  
Research And Practice ◽  
The Media ◽  
Advertising Communication ◽  
Advertising And Promotion ◽  
Hybrid Forms

In the media convergence era, brands are embracing hybrid forms of advertising communication such as branded content, product placement and sponsored TV ‘pods’, brand blogs, shareable video, programmatic advertising, ‘native’ advertising and more, as alternatives to, and extensions of, traditional mass media advertising campaigns. In this article, we draw on Genette’s theory of transtextuality to reframe this phenomenon from a paratextual purview. We suggest that the analogy of the paratext articulates the iterative, ambiguous, participative and intertextual character of much contemporary brand communication. We describe extended examples of paratextual advertising and promotion that illustrate the fluid and mutually contingent relation of advertising text to paratext, and we outline an analytical framework for future research and practice.

Religiosity and spirituality during the transition to adulthood

2010 ◽  
Vol 34 (4) ◽  
pp. 311-324 ◽  
Author(s):  
Carolyn McNamara Barry ◽  
Larry Nelson ◽  
Sahar Davarya ◽  
Shirene Urry
Keyword(s):  
Emerging Adults ◽  
Transition To Adulthood ◽  
Psychosocial Development ◽  
Empirical Work ◽  
Future Research ◽  
Time Period ◽  
The Media ◽  
And Gender ◽  
Religiosity And Spirituality ◽  
Socializing Agents

Emerging adults (approximately 18 to 25 years of age) experience heightened self-exploration regarding their beliefs and values, including those concerning religiosity and spirituality. The purpose of this article is to review the literature regarding religiosity and spirituality in emerging adulthood. First, we document developmental advances in physical, cognitive, and psychosocial development that support this exploration along with theoretical and empirical work on how religiosity and spirituality develop during this time period. Second, we examine the research on prevalence rates for and correlates of religiosity and spirituality. Third, we examine socializing agents of religiosity and spirituality that document parents’ indirect role relative to other adults, peers, and the media. Next, we examine the role that culture, community, and gender play in the development and socialization of religious and spiritual beliefs and practices. Lastly, future research directions and implications of the findings are discussed.

Issue Emergence, Evolution of Controversy, and Implications for Competitive Framing

2011 ◽  
Vol 17 (2) ◽  
pp. 169-189 ◽  
Author(s):  
Erika Franklin Fowler ◽  
Sarah E. Gollust ◽  
Amanda F. Dempsey ◽  
Paula M. Lantz ◽  
Peter A. Ubel
Keyword(s):  
Content Analysis ◽  
Dynamic Process ◽  
Hpv Vaccine ◽  
Public Discourse ◽  
News Coverage ◽  
Future Research ◽  
Local Newspapers ◽  
The Media ◽  
External Events ◽  
Insight Into

Although scholarship on competitive framing acknowledges that framing is a dynamic process in which the early stages may matter most, very little research has focused on the dynamics of issue emergence. In this article, we draw on several literatures to develop theories for how controversy related to new issues will emerge and expand in news coverage. Through a comprehensive content analysis of 101 local newspapers across the fifty U.S. states, we explore the dynamic and evolving process wherein a new issue—the HPV vaccine—emerged into public discourse and a legislative debate over school requirements for vaccination began. We find that coverage of controversy is a function of proximity, driven primarily by events within a state, although external events also influence local coverage. We also find that the legislative discussion in the media did not necessarily start out as controversial, but as the issue evolved, we observe a large increase in the proliferation of both actors taking positions and the types of arguments made to influence debate. The findings yield important insight into issue emergence with implications for how future research might test competing frames to better understand how the presentation of controversy in the mass media affects public opinion.

“Sharia on a Plate?” A critical discourse analysis of halal food in two Norwegian newspapers

2015 ◽  
Vol 6 (3) ◽  
pp. 331-353 ◽  
Author(s):  
Paul Thomas ◽  
Amina Selimovic
Keyword(s):  
Discourse Analysis ◽  
Critical Discourse Analysis ◽  
Media Coverage ◽  
Critical Discourse ◽  
Fundamental Aspect ◽  
Future Research ◽  
Content Type ◽  
Online Newspapers ◽  
Halal Food ◽  
The Media

Purpose – This study aims to explore how two Norwegian national online newspapers, Dagbladet and Aftenposten, have framed halal food in the past 6 years (2008-2014), a period conflating with a rise in Muslim demographics in Norway. Design/methodology/approach – A mixed-methods approach is used. Employing among others a Hallidayan transitivity analysis and other approaches from critical discourse analysis (CDA), clausal semantic structures, collocations and nominalizations were explored with a view toward fleshing out ideological significance. Particular attention was given to the neologism – “covert-Islamization” – popularized by the populist right-wing Progress Party. Findings – The findings reveal that Dagbladet refracts halal food through a discourse of crime and other dubious frames tapping into topoi of Islamophobia. Halal is, in this manner, transformed into a synecdoche for deviance. This is contrasted with Aftenposten’s more “halal-friendly” gaze which inter alia is attributed to greater access for Muslim contributors (over 40 per cent), with nearly all authorship penned in the aftermath of the Breivik massacre of July 22, 2011. Research limitations/implications – As a comparative research that explores two newspapers – albeit with substantial national circulation – there are obvious limitations. Future research could explore the contents of Verdens Gang, the biggest newspaper in Norway, and perhaps incorporate iconic semiotic content. Social implications – The prevalent media discourse on halal in Norway casts a shadow over a fundamental aspect of the identity construction of Norwegians who adhere to Islam, thus highlighting issues of belonging and citizenry in the “new” Norway. National discourses of identity and belonging impact upon the Muslim consumer’s perception of self and ethnicity, and how these perceptions are negotiated in the interstices of a skewed media coverage of halal certainly serves to undermine this self-perception. Originality/value – Several recent studies have broached the subject of the manifold representations of Muslims and Islam in the media using a CDA, but there is a dearth in studies with a specific focus on halal food. This study contributes to the lacuna in the literature in an area of growing importance, not just as a socio-political and religious phenomenon, but a lucrative commercial project in a Scandinavian context.

scholarly journals Television and Fertility

2010 ◽  
pp. 67-82 ◽  
Author(s):  
Stuart Basten
Keyword(s):  
Public Health ◽  
Mass Media ◽  
Low Fertility ◽  
Future Research ◽  
Media Presentation ◽  
Sliding Scale ◽  
The Media ◽  
Television Plays ◽  
The Impact

Much research has been conducted in the field of utilising the media - television and radio in particular - to promote particular public health messages. However, a burgeoning canon has examined how mass media can play a role in affecting change in fertility preferences and outcomes. In this paper we review these researches which have primarily focussed upon higher fertility settings. The impact of mass media presentation of families and children in low fertility settings has not yet been subject to rigorous sociological investigation so its impact can not be accurately inferred. However, given the pervasive nature of mass media and celebrity culture, we suggest that this is an important avenue for future research. We conclude that television plays a multi-faceted role in shaping individuals decision-making procedures concerning both demographic events and public health interactions. To illustrate this, we present a model which demonstrates a sliding scale of intent - but not impact - of various genres in order to understand the actual role of the media in shaping attitudes towards family size - either explicitly in terms of edutainment or implicitly as a forms of normalization.

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