A Preliminary Investigation into the Impact of Centrifugal Forces and Cake Properties on Methanogenesis from Dewatered Sludge Cake

2008 ◽  
Vol 2008 (3) ◽  
pp. 544-558
Author(s):  
Christopher D. Muller ◽  
John T. Novak
Keyword(s):  
Preliminary Investigation ◽  
Centrifugal Forces ◽  
Sludge Cake ◽  
Dewatered Sludge ◽  
The Impact

Considering the impact of intermittent discharges when modelling overflows

1998 ◽  
Vol 38 (10) ◽  
pp. 23-30
Author(s):  
Sarah Jubb ◽  
Philip Hulme ◽  
Ian Guymer ◽  
John Martin
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Preliminary Investigation ◽  
Oxygen Demand ◽  
Sediment Oxygen Demand ◽  
Combined Sewer Overflows ◽  
River Hydraulics ◽  
Combined Sewer ◽  
The Impact ◽  
Curve Equation

This paper describes a preliminary investigation that identified factors important in the prediction of river water quality, especially regarding dissolved oxygen (DO) concentration. Intermittent discharges from combined sewer overflows (CSOs) within the sewerage, and overflows at water reclamation works (WRW) cause dynamic conditions with respect to both river hydraulics and water quality. The impact of such discharges has been investigated under both wet and dry weather flow conditions. Data collected from the River Maun, UK, has shown that an immediate, transient oxygen demand exists downstream of an outfall during storm conditions. The presence of a delayed oxygen demand has also been identified. With regard to modelling, initial investigations used a simplified channel and the Streeter-Phelps (1925) dissolved oxygen sag curve equation. Later, a model taking into account hydrodynamic, transport and dispersion processes was used. This suggested that processes other than water phase degradation of organic matter significantly affect the dissolved oxygen concentration downstream of the location of an intermittent discharge. It is proposed that the dynamic rate of reaeration and the sediment oxygen demand should be the focus of further investigation.

scholarly journals Landscapes with different logics: A physicalistic approach to semantic conflicts in spatial planning

2017 ◽  
Vol 36 (4) ◽  
pp. 29-45 ◽  
Author(s):  
Robert Krzysztofik ◽  
Mirek Dymitrow ◽  
Jadwiga Biegańska ◽  
Adam Senetra ◽  
Eleftheria Gavriilidou ◽  
...  
Keyword(s):  
Economic Development ◽  
Spatial Planning ◽  
Centrifugal Forces ◽  
Complicated Structure ◽  
Anthropogenic Landscapes ◽  
Semantic Conflicts ◽  
Socio Economic Development ◽  
The Impact ◽  
Geographical Space ◽  
Special Meaning

Abstract This paper deals with the ways of categorising landscapes as ‘urban’ and ‘rural’ using a physicalist approach, where these terms have special meaning. The aim of this paper is to elaborate on the question whether such a division is still meaningful with regard to anthropogenic landscapes, not least in spatial planning. The concerns raised in this paper depart from the increasingly complicated structure of geographical space, including that of anthropogenic landscapes. Our standpoint is illustrated using cases of landscape ambiguities from Poland, Germany, Romania and Greece. Leaning on frameworks of physicalist (mechanicistic) theory, this paper suggests an explanation to the outlined semantic conflicts. This is done by pointing to the relationality between the impact of centripetal and centrifugal forces, the specifics of socio-economic development, as well as the varying landscape forms that emerge from the differences within that development.

scholarly journals Gender differences in barriers to mental healthcare for UK military veterans: a preliminary investigation

2021 ◽  
pp. bmjmilitary-2020-001754
Author(s):  
Lauren Rose Godier-McBard ◽  
G Cable ◽  
A D Wood ◽  
M Fossey
Keyword(s):  
Gender Differences ◽  
Help Seeking ◽  
Online Survey ◽  
Mental Health Problems ◽  
Military Veterans ◽  
Preliminary Investigation ◽  
Mental Healthcare ◽  
Armed Forces ◽  
Free Text ◽  
The Impact

IntroductionLimited UK research focuses on female military veterans’ gender-related experiences and issues when accessing civilian mental healthcare support. This study sought to illuminate a preliminary understanding of any gender differences in barriers that may discourage them accessing mental healthcare support.MethodsA total of 100 participants completed an open online survey of UK triservice veterans who identified as having experienced postmilitary mental health problems. They completed a 30-item Barriers to Access to Care Evaluation scale and were asked to elaborate using free-text questions. Resulting quantitative data were analysed for gender-related differences, while the qualitative text was thematically explored.ResultsWhile stigma, previous poor experience of mental healthcare and a lack of trust in civilian providers were found to act as barriers to postmilitary support for both men and women, significantly more women reported that their gender had also impacted on their intention to seek help. Women also commented on the impact of gender-related discrimination during service on their help-seeking experiences.ConclusionsWhile efforts are being made by the UK Ministry of Defence to reduce barriers to mental healthcare for those still serving in the Armed Forces, it has been more difficult to provide a similar level of support to the veteran population. With little veteran research focusing on the specific experiences of women, this study suggests that female veterans encounter specific access barriers and issues related to their gender. Further research is therefore needed to ensure these findings are addressed.

scholarly journals Why Do People (Not) Engage in Social Distancing? Proximate and Ultimate Analyses of Norm-Following During the COVID-19 Pandemic

2021 ◽  
Vol 12 ◽  
Author(s):  
James O. Norton ◽  
Kortnee C. Evans ◽  
Ayten Yesim Semchenko ◽  
Laith Al-Shawaf ◽  
David M. G. Lewis
Keyword(s):  
Public Health ◽  
Social Norms ◽  
Human Life ◽  
Preliminary Investigation ◽  
Political Leaders ◽  
Public Health Organizations ◽  
Health Related ◽  
Negative Effect ◽  
Perceived Social Norms ◽  
The Impact

COVID-19 has had a profound negative effect on many aspects of human life. While pharmacological solutions are being developed and implemented, the onus of mitigating the impact of the virus falls, in part, on individual citizens and their adherence to public health guidelines. However, promoting adherence to these guidelines has proven challenging. There is a pressing need to understand the factors that influence people’s adherence to these guidelines in order to improve public compliance. To this end, the current study investigated whether people’s perceptions of others’ adherence predict their own adherence. We also investigated whether any influence of perceived social norms was mediated by perceptions of the moral wrongness of non-adherence, anticipated shame for non-adherence, or perceptions of disease severity. One hundred fifty-two Australians participated in our study between June 6, 2020 and August 21, 2020. Findings from this preliminary investigation suggest that (1) people match their behavior to perceived social norms, and (2) this is driven, at least in part, by people using others’ behavior as a cue to the severity of disease threat. Such findings provide insight into the proximate and ultimate bases of norm-following behavior, and shed preliminary light on public health-related behavior in the context of a pandemic. Although further research is needed, the results of this study—which suggest that people use others’ behavior as a cue to how serious the pandemic is and as a guide for their own behavior—could have important implications for public health organizations, social movements, and political leaders and the role they play in the fight against epidemics and pandemics.

scholarly journals Preliminary Investigation on Auto-Thermal Extrusion of Ground Tire Rubber

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2090 ◽  
Author(s):  
Łukasz Zedler ◽  
Daria Kowalkowska-Zedler ◽  
Henri Vahabi ◽  
Mohammad Reza Saeb ◽  
Xavier Colom ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Preliminary Investigation ◽  
Fourier Transform Infrared ◽  
Gas Chromatography Mass Spectrometry ◽  
Tire Rubber ◽  
Ground Tire Rubber ◽  
The Impact ◽  
Thermal Extrusion

Ground tire rubber (GTR) was processed using an auto-thermal extrusion as a prerequisite to green reclaiming of waste rubbers. The reclaimed GTR underwent a series of tests: thermogravimetric analysis combined with Fourier-transform infrared spectroscopy (TGA-FTIR), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and static headspace and gas chromatography-mass spectrometry (SHS-GC-MS) in order to evaluate the impact of barrel heating conditions (with/without external barrel heating) on the reclaiming process of GTR. Moreover, samples were cured to assess the impact of reclaiming heating conditions on curing characteristics and physico-mechanical properties. Detailed analysis of the results indicated that the application of auto-thermal extrusion is a promising approach for the sustainable development of reclaiming technologies.

Laboratory Investigations on the Effects of Bacteria on Fine-Grained Soils

2017 ◽  
Vol 21 ◽  
pp. 352-357 ◽  
Author(s):  
S. Sowmya ◽  
P.S. Meenu ◽  
R. Asha Latha ◽  
Devendra Narain Singh
Keyword(s):  
Preliminary Investigation ◽  
Biological Processes ◽  
Fine Grained ◽  
Recent Developments ◽  
Prospective Application ◽  
Laboratory Investigations ◽  
The Impact ◽  
Geotechnical Problems ◽  
Long Term Studies

Over the years, the field of geotechnical engineering focused on physical, chemical and mechanical aspects of the geomaterials. However, recent developments in environmental geotechnics have highlighted the impact of biological processes on geo-materials and their performance. Also, the present day geotechnical problems favour biological interventions to develop eco-friendly and sustainable technology. In view of this, the present study is a preliminary investigation on the impact of microbial loading on fine-grained soils. In addition, a protocol has been developed to establish ‘bio-geo interface’ between bacteria and the geo-material. However, long term studies are demanded in this direction for in-depth understanding of the mechanism for development of prospective application.

The thin-layer drying characteristics of sewage sludge by the appropriate foaming pretreatment

2014 ◽  
Vol 69 (9) ◽  
pp. 1859-1866 ◽  
Author(s):  
Hui-Ling Wang ◽  
Zhao-Hui Yang ◽  
Jing Huang ◽  
Li-Ke Wang ◽  
Cheng-Liu Gou ◽  
...  
Keyword(s):  
Sample Thickness ◽  
Coefficient Of Determination ◽  
Drying Rate ◽  
Drying Time ◽  
Drying Characteristics ◽  
Thin Layer Drying ◽  
Dewatered Sludge ◽  
Drying Curves ◽  
Sludge Drying ◽  
The Impact

As dewatered sludge is highly viscous and sticky, the combination of foaming pretreatment and drying process seems to be an alternative method to improve the drying performance of dewatered sludge. In this study, CaO addition followed by mechanical whipping was employed for foaming the dewatered sludge. It was found that the foams were stable and the diameters of bubbles mainly ranged from 0.1 to 0.3 mm. The drying experiments were carried out in a drying oven in the convective mode. The results indicated that foamed sludge at 0.70 g/cm3 had the best drying performance at each level of temperature, which could save 35–45% drying time to reach 20% moisture content compared with the non-foamed sludge. The drying rate of foamed sludge at 0.70 g/cm3 was improved with the increasing of drying temperature. The impact of sample thickness on drying rate was not obvious when the sample thickness increased from 2 to 8 mm. Different mathematical models were used for the simulation of foamed sludge drying curves. The Wang and Singh model represented the drying characteristics better than other models with coefficient of determination values over 0.99.

The Impact of Nationalism on Albanian–Slav Relations in Late Ottoman Macedonia: A Historiographical Review

2019 ◽  
Vol 47 (6) ◽  
pp. 1117-1130
Author(s):  
Fabio Bego
Keyword(s):  
Cold War ◽  
Preliminary Investigation ◽  
The Past ◽  
Ottoman Balkans ◽  
Historical Accounts ◽  
The Cold War ◽  
New Generation ◽  
The Impact ◽  
Late Ottoman

AbstractThe aim of this article is to inquire how recent and more consolidated historiographical trends consider the impact of nationalism in the late Ottoman Balkans. I focus on historical accounts of Albanian–Slav interaction in the late Ottoman Macedonian context, although the inquiry also includes texts that do not only engage with this epistemological field. I confront research efforts that have been published from the early 1960s to the present in order to understand the continuities and the discontinuities that characterize the work of historians. A preliminary investigation has allowed me to outline two main historiographical approaches: the national historiographies and the postnationalist approach. Such a distinction has become tangible especially after the end of the Cold War when a new generation of historians started to question the validity of the studies conducted by their colleagues in the past decades by pointing at the methodological and ideological issues that limited their work. In this article I evaluate to what extent the work of postnationalist historians is different from that of traditional historiographies and finally reflect on the possibility and benefits that might come from a dialogue between the two approaches.

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