ORCID Profile
0000-0002-0450-1983
Current Organisations
University of Western Australia
,
Institute of Physical Chemistry, Polish Academy of Sciences
,
University of Lincoln
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Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 05-2016
DOI: 10.1016/J.CHEMOSPHERE.2016.02.030
Abstract: In full scale water treatment operation, the rapid filtration process, as the last step of solid-liquid separation, is largely influenced by floc characteristics. In this study, aluminium sulphate (alum) and nano-Al13 were investigated to understand the influence of coagulant species on the formation and filterability of flocs. At neutral pH, it was found that nano-Al13, a high MW polymer, showed better floc filterability than alum. This is because of the densely compacted and well-distributed size flocs from nano-Al13, even though floc sizes of alum were generally bigger. Al specie distributions of the two coagulants at different pH levels were compared by using electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS) to further elucidate the reasons for the superiority of nano-Al13 in floc filterability. Depolymerisation/re-polymerisation of nano-Al13 occurred as pH changed, and Al species from nano-Al13were more abundant than that from alum, especially for the high molecular weight (MW) oligomers such as Al11, Al12, Al13 and Al14. Under the charge neutralisation mechanism, higher MW Al species was found to improve coagulation performance and floc filterability. In addition, breakage resistance and regrowth ability of nano-Al13 was better than alum, at weak acid condition. Flocs formed by the charge neutralisation mechanism readily regenerated after being thoroughly broken up. The floc regrowth ability of nano-Al13 at high shear rates (200 rpm and 300 rpm) was much better than at low shear and better than any shear applied to alum., and the flocs after breakage at 200 rpm and 300 rpm also showed better filterability than other conditions.
Publisher: MDPI AG
Date: 03-09-2021
Abstract: Architectural heritage conservation in recent years has hinged on conventional methods and has failed to recognize innovative methods and emerging technologies. Consequently, in Nigeria, suboptimal conservation work results in the continual deterioration of architectural heritage, leading to the loss of heritage and its values and significance. The study, therefore, sought to examine challenges and prospects for implementing innovative techniques in the conservation of architectural heritage in Nigeria. The study examined three heritage conservation interventions in Nigeria, focusing on the applicability of innovative conservation methods for documentation, diagnosis, and treatment of deterioration of architectural heritage. Questionnaires were administered through purposive s ling to 40 heritage conservation professionals, with 31 (77.5%) completed and returned for analysis. A Cronbach’s alpha reliability test value of 0.76 established the validity of the research instrument. The findings affirmed that heritage professionals have low familiarity (mean value of 2.19) with innovative techniques for conservation of architectural heritage. Of the respondents, 41.9% had gained a minimal level of technical knowledge of how to implement innovative techniques in conservation interventions. Improving the performance of conservation interventions also ranked highly as a potential strength of implementing innovative techniques. Conclusively, there is a need to improve advocacy and training in innovative conservation techniques based on their ability to characterize architectural heritage materials and investigate their chemical composition, microstructure, and morphological features.
Publisher: Antiquity Publications
Date: 02-11-2022
Abstract: Climate change threatens archaeological sites and cultural landscapes globally. While to date, awareness and action around cultural heritage and climate change adaptation planning has focused on Europe and North America, in this article, the authors address adaptation policy and measures for heritage sites in low- and middle-income countries. Using a review of national adaptation plans, expert survey and five case studies, results show the varied climate change adaptation responses across four continents, their strengths and weaknesses, and the barriers to be addressed to ensure better integration of cultural heritage in climate change adaptation planning.
Publisher: Springer Singapore
Date: 2020
Publisher: The Optical Society
Date: 20-10-2017
DOI: 10.1364/BOE.8.005127
Publisher: IOP Publishing
Date: 12-2019
DOI: 10.1088/1742-6596/1378/4/042023
Abstract: Protecting the built environment through reasonable incorporation of sustainable principles into the design of buildings is a vital role of architects and other built environment professionals. By so doing, the increase observed in energy demand of buildings constitutes a major challenge to the protection of and reduction of greenhouse gases produced by buildings. This constitutes a critical element in the movement towards a more sustainable future. This study examines the indispensable relevance of carrying-out energy performance analysis on a building design blueprints prior to construction. The study employs the use of Autodesk Revit 2014 as a Building Information Modeling (BIM) tool and Autodesk Green Building Studio (GBS) for energy performance analysis of an existing student housing at Federal University of Technology Akure, Ondo state, Nigeria in order to recommend energy efficient strategies that could be implemented at the design phase of the student housing. The energy-saving effects of the different building envelope were investigated and results were analyzed. The annual energy use revealed approximately 60 percent of electricity consumed from the national grid with the left-over 40 percent expelled on fuel. This result was, however, based on an assumption of a 20 hours minimum daily power supply from the national grid. The monthly heating load chart shows that heat is lost from the walls of the building. The walling material has a considerable impact on energy consumption. The simulation results of the existing student housing were compared with eight alternative designs that alter the building envelope and incorporate shading devices to reduce the carbon footprint and energy use. The best alternative design runs reduced the energy consumed yearly from 402, 168 kWh/year to 385, 318kWh/year.
Publisher: AIP Publishing
Date: 04-2022
DOI: 10.1063/5.0072223
Abstract: Mammographic breast density is a strong breast cancer risk factor, and its routine clinical measurement could potentially be used to identify women at higher risk of breast cancer and/or monitor primary prevention strategies. Previous reports of optical breast spectroscopy (OBS), a novel approach to measuring breast density, demonstrated that it is safe (no ionizing radiation), portable, low-cost, and does not require image interpretation but have been limited to small, single-center studies. Reference measurements taken on a phantom breast prior to and after each woman’s OBS assessment are required for the calibration of the system transfer function as a part of processing participant data. To inform the validity of participant data, a detailed description of the reference measurements and a repeatability analysis of these measurements taken before and after participant assessment is presented. Reference measurements for OBS from 539 women aged 18–40 years were obtained as a part of a high-throughput epidemiological pilot study. Of these, measurements from 20 women with no useable data due to device failure (3.7%) were excluded and from another 12 women due to user error. The intra-class correlation (ICC) within complete pairs of reference data (taken before and after assessment) was high (all ICC & 0.84). The analysis presented here confirms the OBS participant data as valid for use in ongoing epidemiological research, providing further supporting evidence of OBS as a measure of breast density. A novel method of measuring breast density is needed to bridge large gaps in the knowledge of breast density in younger women and its relation to later-life breast cancer risk.
Publisher: Springer International Publishing
Date: 2018
Location: Poland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Olufemi Adetunji.