cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25381/cput.19575790
title: Evaluation of new semi-quantitative cryptococcal antigen Immy (immunochromatographic) SQ (semi-quantitative) and Biosynex tests in plasma for detection of subclinical cryptococcal meningitis in HIV positive patients with CD4 &lt;100Untitled Item

description: CPUT/HW-REC 2019/H28. MYCOLOGY DATA SET We compared SQ and CryptoPS results to titers for LFA-positive samples. Among patients with LP, we examined the association between semi-quantitative CrAg results and CM. We used a Cox proportional hazards model to determine the association between SQ score and mortality. Of 194 participants, 60 (31%) had positive LFA results, of whom 41 (68%) had a titer of ≤160 and 19 (32%) a titer &gt;160. Fifty individuals with antigenemia had an LP; a clinically useful SQ score that identified all ten cases of subclinical CM was ≥3 (100% sensitivity, 55% specificity). Patients with an SQ score of 3 or 4 also had a 2.2-fold increased adjusted hazards of 6-month mortality (95% CI: 0.79–6.34; p = 0.13) versus those with score of &lt;3. Nine of ten patients with subclinical CM had a strong-positive CryptoPS result versus 10/40 without subclinical CM (p &lt; 0.001). Semi-quantitative assays offered a sensitive though not specific means of gauging the risk of concurrent CM in this patient population.
DOI: 10.25381/cput.19575790.v1
title: Evaluation of new semi-quantitative cryptococcal antigen Immy (immunochromatographic) SQ (semi-quantitative) and Biosynex tests in plasma for detection of subclinical cryptococcal meningitis in HIV positive patients with CD4 &lt;100Untitled Item

description: CPUT/HW-REC 2019/H28. MYCOLOGY DATA SET We compared SQ and CryptoPS results to titers for LFA-positive samples. Among patients with LP, we examined the association between semi-quantitative CrAg results and CM. We used a Cox proportional hazards model to determine the association between SQ score and mortality. Of 194 participants, 60 (31%) had positive LFA results, of whom 41 (68%) had a titer of ≤160 and 19 (32%) a titer &gt;160. Fifty individuals with antigenemia had an LP; a clinically useful SQ score that identified all ten cases of subclinical CM was ≥3 (100% sensitivity, 55% specificity). Patients with an SQ score of 3 or 4 also had a 2.2-fold increased adjusted hazards of 6-month mortality (95% CI: 0.79–6.34; p = 0.13) versus those with score of &lt;3. Nine of ten patients with subclinical CM had a strong-positive CryptoPS result versus 10/40 without subclinical CM (p &lt; 0.001). Semi-quantitative assays offered a sensitive though not specific means of gauging the risk of concurrent CM in this patient population.
DOI: 10.25381/cput.7687202.v2
title: Figures of experiments conducted to support the numerical analysis of the hydrodynamic mixing characteristics of a rectangular versus a cylindrical mixing crystallizer tank for a membrane distillation apparatus

description: Clear polycarbonate replicas of the rectangular tanks were manufactured to visually observe the mixing process in the tanks. Silica particles were used to represent the calcium carbonate crystals in the experiment. The data gathered from these experiments showed that the tanks should be operated between 600 to 750 rpm.<br>The figure names contain the speed of mixing in RPM either 600 or 750 and the time elapsed from the start of agitation. The .1 represents a set of experiments.
DOI: 10.25381/cput.7687202
title: Figures of experiments conducted to support the numerical analysis of the hydrodynamic mixing characteristics of a rectangular versus a cylindrical mixing crystallizer tank for a membrane distillation apparatus

description: Clear polycarbonate replicas of the rectangular tanks were manufactured to visually observe the mixing process in the tanks. Silica particles were used to represent the calcium carbonate crystals in the experiment. The data gathered from these experiments showed that the tanks should be operated between 600 to 750 rpm.<br>The figure names contain the speed of mixing in RPM either 600 or 750 and the time elapsed from the start of agitation. The .1 represents a set of experiments.
DOI: 10.25381/cput.7687202.v1
title: Experiments were conducted to support the numerical analysis of the hydrodynamic mixing characteristics of a rectangular versus a cylindrical mixing crystallizer tank for a membrane distillation apparatus

description: Clear polycarbonate replicas of the rectangular tanks were manufactured to visually observe the mixing process in the tanks. Silica particles were used to represent the calcium carbonate crystals in the experiment. The data gathered from these experiments showed that the tanks should be operated between 600 to 750 rpm.<br>The figure names contain the speed of mixing in RPM either 600 or 750 and the time elapsed from the start of agitation. The .1 represents a set of experiments.
DOI: 10.25381/cput.7712249.v1
title: Videos of experiments conducted to support the numerical analysis of the hydrodynamic mixing characteristics of a rectangular versus a cylindrical mixing crystallizer tank for a membrane distillation apparatus

description: The development of the suspension of the silica particles inside the clear polycarbonate mixing tanks was captured on video. Software was used to extract data at one second intervals from the experimental videos. Autodesk AutoCAD was used to create 1:1 scale models of the captured images. The images were superimposed to accurately measure and compare the CFD imaged to the experimental cloud height. The file names contain a RPM value that represents the rotational velocity of the impeller at which the experiments were performed. There were 6 repetitions performed at the rotational speeds of 600 and 750 rpm which is reflected in the additional number in the file name.
DOI: 10.25381/cput.7712360
title: Figures of the numerical analysis of the hydrodynamic mixing characteristics of a rectangular versus a cylindrical mixing crystallizer tank for a membrane distillation apparatus using Ansys Fluent CFD implementation of the Eulerian granular multiphase model

description: The CFD cross-sections from the simulations were extracted from two positions. The CFD data needed for the comparison to the experiment were taken at the outer wall of the model to match the perspective of the video. The second position used in the CFD comparison of a rectangular versus a cylindrical tank were at the center of the impeller where the dynamics were most clear. The zero point was at the center of the 3D models, where X=0, Y=0 and Z=0. The figure names contain the location at which the cross-sections was taken from, the relevant model, i.e. turbulent dissipation rate, turbulent kinetic energy, velocity magnitude, velocity vectors, solids suspension in terms of volume fraction (VF), 3D volume fraction renderings and the rotational velocity in terms of revolutions per minute (RPM). The superimposed data figures names contain the VF that indicates the CFD function volume fraction, the rotational velocity (RPM), the time interval in seconds and SI to show the data was superimposed
DOI: 10.25381/cput.7712249
title: Videos of experiments conducted to support the numerical analysis of the hydrodynamic mixing characteristics of a rectangular versus a cylindrical mixing crystallizer tank for a membrane distillation apparatus

description: The development of the suspension of the silica particles inside the clear polycarbonate mixing tanks was captured on video. Software was used to extract data at one second intervals from the experimental videos. Autodesk AutoCAD was used to create 1:1 scale models of the captured images. The images were superimposed to accurately measure and compare the CFD imaged to the experimental cloud height. The file names contain a RPM value that represents the rotational velocity of the impeller at which the experiments were performed. There were 6 repetitions performed at the rotational speeds of 600 and 750 rpm which is reflected in the additional number in the file name.
DOI: 10.25381/cput.9746537
title: Geochemical modelling and seasonal hydrogeochemical processes of the open-pit groundwater at O’Kiep, Namaqualand, South Africa

description: To assess dissolution, precipitation processes and saturation indices (SI) of some mineral phases, PHREEQC modelling software was used to assess these different geochemical processes and to elucidate reactive minerals of the open-pit groundwater (OPGW) in O’Kiep, Namaqualand, South Africa. Equilibrium constants were not fixed into the coding of the software PHREEQC, to accommodate equilibrium constant changes, and PHREEQC user input file manipulation. The SI of less than zero implied that the OPGW was undersaturated and that mineral dissolution was required to reach equilibrium. The data of the hydrogeochemical analysis indicated that the sources of ions into the OPGW are largely from the dissolution and leaching of mine waste and tailings including runoffs during the wet season, with the underlying fracturing of rocks, cation exchanges and other anthropogenic activities making a contribution. Additionally, climatic seasonality significantly influenced the OPGW hydrogeochemistry, indicating that the hydrological processes which control changes were dilution and mobilization of potentially toxic elements (PTEs). The data set generated showed that the OPGW chemistry was mainly influenced by evaporation, ion exchange, silicate weathering and dissolution of minerals including precipitation. Overall, this dataset details hydrogeochemical processes that are responsible for seasonal variations in the OPGW chemistry.
DOI: 10.25381/cput.9746537.v1
title: Geochemical modelling and seasonal hydrogeochemical processes of the open-pit groundwater at O’Kiep, Namaqualand, South Africa

description: To assess dissolution, precipitation processes and saturation indices (SI) of some mineral phases, PHREEQC modelling software was used to assess these different geochemical processes and to elucidate reactive minerals of the open-pit groundwater (OPGW) in O’Kiep, Namaqualand, South Africa. Equilibrium constants were not fixed into the coding of the software PHREEQC, to accommodate equilibrium constant changes, and PHREEQC user input file manipulation. The SI of less than zero implied that the OPGW was undersaturated and that mineral dissolution was required to reach equilibrium. The data of the hydrogeochemical analysis indicated that the sources of ions into the OPGW are largely from the dissolution and leaching of mine waste and tailings including runoffs during the wet season, with the underlying fracturing of rocks, cation exchanges and other anthropogenic activities making a contribution. Additionally, climatic seasonality significantly influenced the OPGW hydrogeochemistry, indicating that the hydrological processes which control changes were dilution and mobilization of potentially toxic elements (PTEs). The data set generated showed that the OPGW chemistry was mainly influenced by evaporation, ion exchange, silicate weathering and dissolution of minerals including precipitation. Overall, this dataset details hydrogeochemical processes that are responsible for seasonal variations in the OPGW chemistry.
DOI: 10.25381/cput.12820505
title: Geochemical modelling of groundwater in the Namaqualand region, South Africa

description: Namaqualand is one of the aridest areas in South Africa. In recent years, rapid development has created a higher demand for water which is increasingly fulfilled by groundwater abstraction. Comprehensive information of geochemical evolution of groundwater quality can improve the understanding of hydrochemical characteristics, and promote sustainable development and effective management of groundwater resources. The study aims were to use PHREEQC model to determine hydrogeochemical characteristics of groundwater, to determine how groundwater has deteriorated of time and to identify the major phases that control groundwater in such arid region. The model output showed phases that are governing the groundwater chemistry in this area. The geochemical reactions responsible for the evolution of groundwater chemistry along the flow path were the dissolution of the carbonate minerals such as aragonite, Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>, calcite dolomite, ferrihydrite and vaterite keep gradually from undersaturation to supersaturating status and vice versa happed for Cd(CO<sub>3</sub>), Cr(OH)<sub>3</sub>. The precipitation of anapaite, chloroapatite, chromite, Cr<sub>2</sub>O<sub>3</sub>Fe<sub>5</sub>(OH)(PO<sub>4</sub>)<sub>3</sub>, ferryhydrite, goethite, hematite, hydroxyapatite, lepidocrocite, maghemite, magnetite. In contrast, magnesite changed from undersaturated to equilibrium phase. The SI of gypsum, siderite and halite remained undersaturated, indicating that these minerals may be subject to continuous dissolution. Groundwater hydrogeochemical evolution is mainly controlled by carbonate mineral dissolutions, cation exchange, precipitation and weathering.
DOI: 10.25381/cput.12820505.v1
title: Geochemical modelling of groundwater in the Namaqualand region, South Africa

description: Namaqualand is one of the aridest areas in South Africa. In recent years, rapid development has created a higher demand for water which is increasingly fulfilled by groundwater abstraction. Comprehensive information of geochemical evolution of groundwater quality can improve the understanding of hydrochemical characteristics, and promote sustainable development and effective management of groundwater resources. The study aims were to use PHREEQC model to determine hydrogeochemical characteristics of groundwater, to determine how groundwater has deteriorated of time and to identify the major phases that control groundwater in such arid region. The model output showed phases that are governing the groundwater chemistry in this area. The geochemical reactions responsible for the evolution of groundwater chemistry along the flow path were the dissolution of the carbonate minerals such as aragonite, Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>, calcite dolomite, ferrihydrite and vaterite keep gradually from undersaturation to supersaturating status and vice versa happed for Cd(CO<sub>3</sub>), Cr(OH)<sub>3</sub>. The precipitation of anapaite, chloroapatite, chromite, Cr<sub>2</sub>O<sub>3</sub>Fe<sub>5</sub>(OH)(PO<sub>4</sub>)<sub>3</sub>, ferryhydrite, goethite, hematite, hydroxyapatite, lepidocrocite, maghemite, magnetite. In contrast, magnesite changed from undersaturated to equilibrium phase. The SI of gypsum, siderite and halite remained undersaturated, indicating that these minerals may be subject to continuous dissolution. Groundwater hydrogeochemical evolution is mainly controlled by carbonate mineral dissolutions, cation exchange, precipitation and weathering.
DOI: 10.25381/cput.11992962.v3
title: Four-weeks resistance training increases ball velocity in cricket pace bowlers (raw data).xlsx

description: The data displayed is for the paper titled: "Four-weeks combined resistance training increases ball velocity in cricket pace bowlers". The data represents all the data for the participant characteristics and all tests performed at baseline, 2-weeks, 4-weeks.
DOI: 10.25381/cput.11992962
title: Four-weeks resistance training increases ball velocity in cricket pace bowlers (raw data).xlsx

description: The data displayed is for the paper titled: "Four-weeks combined resistance training increases ball velocity in cricket pace bowlers". The data represents all the data for the participant characteristics and all tests performed at baseline, 2-weeks, 4-weeks.
DOI: 10.5281/zenodo.6674007
title: Kerosene freeze data for paper to be published:

description: This dataset originates in an oil refinery producing, among other products, kerosene. The freeze point of the kerosene is an important specification. In the paper to be published the authors use data quality assessment methods to define periods of the data suitable for the derivation of an inferential model.
DOI: 10.25381/cput.11992962.v2
title: Four-weeks resistance training increases ball velocity in cricket pace bowlers (raw data).xlsx

description: The data displayed is for the paper titled: "Four-weeks combined resistance training increases ball velocity in cricket pace bowlers". The data represents all the data for the participant characteristics and all tests performed at baseline, 2-weeks, 4-weeks.
DOI: 10.25381/cput.14376053
title: Datasets of stratification of cathode catalyst layers in low-temperature proton exchange membrane fuel cells.

description: Datasets of stratification of cathode catalyst layers in low-temperature proton exchange membrane fuel cells<br>
DOI: 10.25381/cput.13302224.v1
title: Use of surfactants for crude oil-in-water emulsions demulsification

description: This research seeks to optimize the efficiency of demulsification of oil-in-water emulsions from matured reservoirs subjected to enhanced oil recovery (EOR) using cetyl trimethylammonium bromide (CTAB) and trimethyl-tetradecyl ammonium chloride (TTAC).This study will focus on simulating stable oil-in-water emulsions at different oil ratios and investigate the factors (oil to water ratio, emulsifier concentration, homogenization speed,salinity, and droplet size) that could affect the stability of the emulsion. Factors such as demulsification time, demulsifier concentration, and oil ratio will be investigated via responsesurface methodology with central composite design to determine the optimum operating conditions for maximum demulsification efficiency.
DOI: 10.25381/cput.14413256
title: Data set on the application of iron oxide nanoparticles for biogas yield optimization from winery solid waste and sorghum stover

description: <i>Different methods and processes of optimizing the yield of biogas are currently being explored globally for better biomass management and renewable energy security. Winery solid waste is problematic in South Africa due to current disposal method to the environment and the way it is being handled. Similarly, a lot of waste is generated during sorghum harvesting; however, the stover represents a suitable feedstock for anaerobic digestion due to its high carbohydrate and protein content. Anaerobic digestion is one of the renewable energy technologies able to produce biogas from a variety of biomass sources. The addition of iron oxide nanoparticles (ION) has been touted to increase biogas production. Therefore, this study aimed to investigate the ability of ION to boost biogas yield via anaerobic digestion process from sorghum stover (SS) and winery solid waste (WSW). Biomethane potential tests were carried out at mesophilic conditions (37°C ± 0.5) in a batch reactor using SS and WSW singly and in combination at 1:1 ratio, in the absence and presence of ION. A 30-day retention time was used for all the tests. Biogas optimization was also carried out. The optimal conditions from three chosen factors viz., solid retention time (SRT), substrate ratio (SS/WSW) and concentration of iron oxide nanoparticles (ION) were investigated for biogas production using Response surface methodology (RSM). The effect and relationship between these three factors on the biogas yield were also explored using CCD (central composite design) to determine the anaerobic co-digestion experiment. The upscaling experiment employed the use of optimal values in a 5 L batch reactor. The results from the BMP tests for substrates with ION (wION) and without ION (w/oION) showed a cumulative methane yield of 9.5 mLCH4.gVS-1 WSW, 18.5 mLCH4.gVS-1 SS, and 44.6 mLCH4.gVS-1 substrate ratio for w/oION. Similarly, 36.3 mLCH4.gVS-1 WSW, 29.3 mLCH4.gVS-1 SS and 60 mLCH4.gVS-1 WSW+SS were obtained from wION. It was concluded that ION had a significant effect on biogas yield especially with WSW biomass where the increase was tripled. Results from the co-digestion experiment produced more biogas than single digestion. Optimization experiment using optimal conditions of 100 ppm for ION concentration, 80:20 substrate ratio and 25 days SRT produced maximum cumulative biogas yield of 51.9 mLCH4.gVS-1 which is higher than the RSM predicted value of 49.6 mLCH4.gVS-1 by the quadratic model. The RSM model proved successful in the optimization process with a determination coefficient (R<sup>2</sup>) value of 0.9528. The upscaled experiment using a 5 L batch reactor at mesophilic conditions with optimal values resulted in a cumulative biogas production of 522.97 mLCH4.gVS-1 with a methane content of 74%. The results of this study will affect the agro-industry as well as waste management practitioners.</i>
DOI: 10.25381/cput.14413256.v1
title: Data set on the application of iron oxide nanoparticles for biogas yield optimization from winery solid waste and sorghum stover

description: <i>Different methods and processes of optimizing the yield of biogas are currently being explored globally for better biomass management and renewable energy security. Winery solid waste is problematic in South Africa due to current disposal method to the environment and the way it is being handled. Similarly, a lot of waste is generated during sorghum harvesting; however, the stover represents a suitable feedstock for anaerobic digestion due to its high carbohydrate and protein content. Anaerobic digestion is one of the renewable energy technologies able to produce biogas from a variety of biomass sources. The addition of iron oxide nanoparticles (ION) has been touted to increase biogas production. Therefore, this study aimed to investigate the ability of ION to boost biogas yield via anaerobic digestion process from sorghum stover (SS) and winery solid waste (WSW). Biomethane potential tests were carried out at mesophilic conditions (37°C ± 0.5) in a batch reactor using SS and WSW singly and in combination at 1:1 ratio, in the absence and presence of ION. A 30-day retention time was used for all the tests. Biogas optimization was also carried out. The optimal conditions from three chosen factors viz., solid retention time (SRT), substrate ratio (SS/WSW) and concentration of iron oxide nanoparticles (ION) were investigated for biogas production using Response surface methodology (RSM). The effect and relationship between these three factors on the biogas yield were also explored using CCD (central composite design) to determine the anaerobic co-digestion experiment. The upscaling experiment employed the use of optimal values in a 5 L batch reactor. The results from the BMP tests for substrates with ION (wION) and without ION (w/oION) showed a cumulative methane yield of 9.5 mLCH4.gVS-1 WSW, 18.5 mLCH4.gVS-1 SS, and 44.6 mLCH4.gVS-1 substrate ratio for w/oION. Similarly, 36.3 mLCH4.gVS-1 WSW, 29.3 mLCH4.gVS-1 SS and 60 mLCH4.gVS-1 WSW+SS were obtained from wION. It was concluded that ION had a significant effect on biogas yield especially with WSW biomass where the increase was tripled. Results from the co-digestion experiment produced more biogas than single digestion. Optimization experiment using optimal conditions of 100 ppm for ION concentration, 80:20 substrate ratio and 25 days SRT produced maximum cumulative biogas yield of 51.9 mLCH4.gVS-1 which is higher than the RSM predicted value of 49.6 mLCH4.gVS-1 by the quadratic model. The RSM model proved successful in the optimization process with a determination coefficient (R<sup>2</sup>) value of 0.9528. The upscaled experiment using a 5 L batch reactor at mesophilic conditions with optimal values resulted in a cumulative biogas production of 522.97 mLCH4.gVS-1 with a methane content of 74%. The results of this study will affect the agro-industry as well as waste management practitioners.</i>
DOI: 10.25381/cput.11992962.v1
title: All raw data.xlsx

description: The data displayed is for the paper titled: "Four-weeks combined resistance training increases ball velocity in cricket pace bowlers". The data represents all the data for the participant characteristics and all tests performed at baseline, 2-weeks, 4-weeks.