Conceptual model development using a generic Features, Events, and Processes (FEP) database for assessing the potential impact of hydraulic fracturing on groundwater aquifers

Tatomir, Alexandru; McDermott, Christopher; Bensabat, Jacob; Class, Holger; Edlmann, Katriona; Taherdangkoo, Reza; Sauter, Martin

doi:10.5194/adgeo-45-185-2018

Cited by 33 publications

(25 citation statements)

References 21 publications

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“…Nowadays, with the rapid growth of the world population and the fast development of society and economy, energy consumption is dramatically increasing year by year [1][2][3]. The great demands for petroleum, coal, and natural gas are remarkably stimulating the development of efficient exploitation and deep-hole drilling for energy resources, as the shallow ones are being depleted gradually [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

et al. 2018

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Self-resonating waterjets (SRWJs) are being widely used in the fields of energy exploitation, due to the significantly increased penetration rate of roller bits in deep-hole drilling. To further improve the impact and erosion abilities of SRWJs, the effects of the downstream contraction ratio of organ-pipe nozzle on the axial pressure oscillations were experimentally studied. The axial pressure oscillation peak and amplitude were used to evaluate the effects under two inlet pressures and various standoff distances. The results show that the downstream contraction ratio can affect the development trends of the pressure oscillations and determines the values of the peaks and amplitudes. Under the experimental conditions, 2.5 is the ratio that leads to the maximum peaks and amplitudes at almost all the testing standoff distances, while the ratio of 2 always results in the minimum ones. The development trend of the pressure oscillation peak for the ratio of 3.5 has a great change at an inlet pressure of 20 MPa. Generally, the relative pressure oscillations are more violent at an inlet pressure of 10 MPa, which is regardless of the contraction ratio. This study helps provide a guideline for determining the physical parameters required in the fabrication of organ-pipe nozzles used for deep-hole drilling.

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Section: Introductionmentioning

confidence: 99%

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

et al. 2018

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“…A model is the description of an approach comprises of an idea, to help an individual to comprehend the content displayed by the model (Tatomir et al, 2018). Similarly, a model is a set of communication or pronouncement about a framework that is being studied, which must be more than an ordinary graphic representation.…”

Section: Co-infection Intervention Modelmentioning

confidence: 99%

Human Immunodeficiency Virus and Malaria Co-Infection among Adults in the North-Central Zone of Nigeria, in the era of Improved access to Prevention and Control: A Study Protocol

Alaofin¹,

Naidoo²

2019

GJHS

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Background: Despite a notable reduction in the incidence and prevalence of HIV and malaria, both diseases remain the leading cause of morbidity and mortality, especially in sub-Saharan Africa. The aim of the research study is to provide epidemiological data of malaria among HIV positive individuals, establish the socio-economic determinants associated with HIV-malaria co-infection, and develop a co-infection intervention model. This research study will enable health policymakers to develop new health policies in the management and care of HIV-malaria co-infected patients. Methods and Analysis: The study design will be a retrospective, descriptive cross-sectional study. Case files of HIV positive individuals receiving care and treatment will be randomly selected at six selected peri-urban secondary hospitals. Interviews will be conducted among HIV positive patients, health managers, and doctors at selected hospitals. A mixed method (quantitative and qualitative) will be adopted in the research study. Proportional allocation will be used to select an estimated 1,652 case files of registered patients to be reviewed across the study location. Statistical Package for Social Sciences version 25.0 will be used for data analysis. The categorical variable will be illustrated as a percentage and compared using Chi-square and Fisher’s exact test. Backward multivariate analysis will be used to evaluate HIV-malaria co-infection and associated health outcomes. The continuous variables will be summarised as mean, ± SD or median, interquartile range, and compared using student t-test or Wilcoxon test. Values of P < 0.05 will be considered significant. Qualitative data will be analysed using NVivo 12 software. Strengths and Limitations of This Study Strengths The proposed large sample size of case files to be reviewed will enhance the validity and precision of the research study. Limitations Data that will be generated might not be adequate to make a generalized conclusion for the whole country.    Q= Quarter. Since the study involves the use of secondary data (generated from patient case files), missing data is anticipated.   Strike actions by health care workers were also expected. Another limitation is that the research study will not be conducted as a prospective cohort study. Ethics and Dissemination Considering the research study involves the use of secondary data, the ethical approval issued to conduct the study covers the informed consent of the participants’ information. Copies of written informed consent, participant consent, and confidentiality forms will be provided to the participants both in English and in the native language, notably Hausa, TIV, and Yoruba. Verbal informed and signed informed consent to take part in the study will be obtained from the participants. This study was approved by the University of KwaZulu-Natal Biomedical Research Ethics Committee (BREC)-Reference Number: (BE654/17). Ethical approval was also obtained from the Kwara State Ministry of Health (MOH/KS/EU/777/225), Benue State Ministry of Health (MOH/STA/204/56), and the Nasarawa State Ministry of Health: NHREC 18/06/2017). Findings from this study will be published in peer-reviewed local and international journals. Findings will also be made available to health policymakers at the state ministry of health and hospital facilities selected for the study. The principal investigators and the health providers will sensitize patients on the study outcome.

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“…Conceptual models use to build knowledge-based systems. Conceptual modeling is a formal description of the aspects of the subject area under study for the purpose of understanding and communication [8][9][10][11].…”

Section: Conceptual Model Of the Knowledge Basementioning

confidence: 99%

A Conceptual Knowledge Model for Research of Critical Energy Infrastructures

Ворожцова¹,

Pyatkova²

2019

Proceedings of the VIth International Workshop 'Critical Infrastructures: Contingency Management, Intelligent, Agent-Based, Clo

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The article proposes a conceptual model of knowledge for the study of the fuel and energy complex as a critical infrastructure. A system of interrelated ontological models reflecting the basic concepts of the subject area and their relationship is proposing as a conceptual model. The structure of the fuel and energy complex objects, the tasks of research from the standpoint of energy security, the models used for research and the corresponding information base are considered. Quantitative information is presented by technical and economic characteristics of energy facilities, reporting data and research results on the development of the fuel and energy complex. The developed system of ontologies is using to structure and integrate knowledge in the study of critical energy infrastructures.

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Conceptual model development using a generic Features, Events, and Processes (FEP) database for assessing the potential impact of hydraulic fracturing on groundwater aquifers

Cited by 33 publications

References 21 publications

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

The Effects of the Downstream Contraction Ratio of Organ-Pipe Nozzle on the Pressure Oscillations of Self-Resonating Waterjets

Human Immunodeficiency Virus and Malaria Co-Infection among Adults in the North-Central Zone of Nigeria, in the era of Improved access to Prevention and Control: A Study Protocol

A Conceptual Knowledge Model for Research of Critical Energy Infrastructures

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