Enabling condition based maintenance in a precious metal processing plant
- Ngoma, William J., Mativenga, Paul T., Pretorius, J.
- Authors: Ngoma, William J. , Mativenga, Paul T. , Pretorius, J.
- Date: 2020
- Subjects: Maintenance , Vacuum pumps , Sensors
- Language: English
- Type: Conference Proceedings
- Identifier: http://hdl.handle.net/10210/433416 , uj:37475 , Ngoma, W.J., Mativenga, P.T., Pretorius, J. 2020: Enabling condition based maintenance in a precious metal processing plant.
- Description: Abstract: , Abstract: Please refer to full text to view abstract.
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- Authors: Ngoma, William J. , Mativenga, Paul T. , Pretorius, J.
- Date: 2020
- Subjects: Maintenance , Vacuum pumps , Sensors
- Language: English
- Type: Conference Proceedings
- Identifier: http://hdl.handle.net/10210/433416 , uj:37475 , Ngoma, W.J., Mativenga, P.T., Pretorius, J. 2020: Enabling condition based maintenance in a precious metal processing plant.
- Description: Abstract: , Abstract: Please refer to full text to view abstract.
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Dataset for a wireless sensor network based drinking-water quality monitoring and notification system
- Sithole, Mhambi Phila Philadephian, Nwulu, Nnamdi I., Dogo, Eustace M.
- Authors: Sithole, Mhambi Phila Philadephian , Nwulu, Nnamdi I. , Dogo, Eustace M.
- Date: 2019
- Subjects: Water quality parameters , Sensors , Internet of things
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/407383 , uj:34289 , Citation: Sithole, M.P.P., Nwulu, N.I. & Dogo, E.M. 2019. Dataset for a wireless sensor network based drinking-water quality monitoring and notification system.
- Description: Abstract: This paper presents the collected experimental data for water quality monitoring which was conducted in ten experiments by using five different common sources of water contaminants namely soil, salt, washing powder, chlorine and vinegar and their combination. The data were collected indoors at room temperature during the day for several days using sensors that measure pH, turbidity, flow rate, and conductivity in water. The water consumption risk (CR) was calculated as deviation based on the water quality parameters standards proposed by the World Health Organisation (WHO) and the South African Department of Water Affairs (DWA), with respect to the sensor measurement readings obtained. While the error measurements were calculated based on the expected parameter measurement per conducted experiment and repeated for 26 measurements. Pure tap water was the benchmark of water safe for human consumption. The first five experiments were performed by introducing each contaminant into the water and thereafter, two contaminants in the sixth experiment and their additions until all different contaminants were experimented at once in the last experiment.
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- Authors: Sithole, Mhambi Phila Philadephian , Nwulu, Nnamdi I. , Dogo, Eustace M.
- Date: 2019
- Subjects: Water quality parameters , Sensors , Internet of things
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/407383 , uj:34289 , Citation: Sithole, M.P.P., Nwulu, N.I. & Dogo, E.M. 2019. Dataset for a wireless sensor network based drinking-water quality monitoring and notification system.
- Description: Abstract: This paper presents the collected experimental data for water quality monitoring which was conducted in ten experiments by using five different common sources of water contaminants namely soil, salt, washing powder, chlorine and vinegar and their combination. The data were collected indoors at room temperature during the day for several days using sensors that measure pH, turbidity, flow rate, and conductivity in water. The water consumption risk (CR) was calculated as deviation based on the water quality parameters standards proposed by the World Health Organisation (WHO) and the South African Department of Water Affairs (DWA), with respect to the sensor measurement readings obtained. While the error measurements were calculated based on the expected parameter measurement per conducted experiment and repeated for 26 measurements. Pure tap water was the benchmark of water safe for human consumption. The first five experiments were performed by introducing each contaminant into the water and thereafter, two contaminants in the sixth experiment and their additions until all different contaminants were experimented at once in the last experiment.
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Development of a small scaled microcontroller-based poultry egg incubation system
- Kutsira, G.V., Nwulu, N.I., Dogo, E.M.
- Authors: Kutsira, G.V. , Nwulu, N.I. , Dogo, E.M.
- Date: 2019
- Subjects: Electrical incubator , Microcontroller , Sensors
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/407402 , uj:34292 , Citation: Kutsira, G.V., Nwulu, N.I. & Dogo, E.M. 2019. Development of a small scaled microcontroller-based poultry egg incubation system.
- Description: Abstract: Owing to an increase in the commercial production of chickens and demand for local consumption as a source of protein in both rural and urban areas in developing countries. This paper proposes a cost-effective incubator for hatching poultry eggs with minimal human involvement. The paper describes the design and implementation of a prototype microcontroller-based electrical incubator system. The developed incubator has optimized temperature and humidity that facilitates higher hatchability rate provided that the egg fertility is high. The prototype incubator was evaluated by loading it with 6 presumed fertile eggs. The percentage of hatchability obtained was 67% (4 out of 6 egg). The remaining two eggs were not hatched as they may not have been fully fertilized.
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- Authors: Kutsira, G.V. , Nwulu, N.I. , Dogo, E.M.
- Date: 2019
- Subjects: Electrical incubator , Microcontroller , Sensors
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/407402 , uj:34292 , Citation: Kutsira, G.V., Nwulu, N.I. & Dogo, E.M. 2019. Development of a small scaled microcontroller-based poultry egg incubation system.
- Description: Abstract: Owing to an increase in the commercial production of chickens and demand for local consumption as a source of protein in both rural and urban areas in developing countries. This paper proposes a cost-effective incubator for hatching poultry eggs with minimal human involvement. The paper describes the design and implementation of a prototype microcontroller-based electrical incubator system. The developed incubator has optimized temperature and humidity that facilitates higher hatchability rate provided that the egg fertility is high. The prototype incubator was evaluated by loading it with 6 presumed fertile eggs. The percentage of hatchability obtained was 67% (4 out of 6 egg). The remaining two eggs were not hatched as they may not have been fully fertilized.
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Development of a wireless sensor network based water quality monitoring and notification system
- Sithole, M.P.P., Nwulu, N.I., Dogo, E.M.
- Authors: Sithole, M.P.P. , Nwulu, N.I. , Dogo, E.M.
- Date: 2019
- Subjects: Water quality , Sensors , IoT
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/${Handle} , uj:34290 , Citation: Sithole, M.P.P., Nwulu, N.I. & Dogo, E.M. 2019. Development of a wireless sensor network based water quality monitoring and notification system.
- Description: Abstract: In this paper, we present a water quality monitoring and notification system. It is also integrated with a consumer alert system on the safety of the water in accordance with the WHO water quality standard. The consumer alert system is made up of a buzzer for notification, a red-Light Emitting Diode (LED) and green-LED as an indicator for unsafe water and safe water respectively. Five sources of contaminants in water namely, soil, chlorine, vinegar, salt, washing powder and their combination were used in this to validate the performance of the system. Wireless communication between the measuring subsystem and the analysis and notification subsystem was established for mobility using radio frequency modules. The error in measurements and the consumption risk per water parameter were calculated on MS Excel as part of the analysis and presented in this document. This paper also presents an added functionality by using a Light Dependent Resistor (LDR) for turbidity measurement and LEDs in the notification subsystem. The notification system accommodates people with disabilities as the buzzer can be heard by those who can’t see, and the LEDs can be seen by those who can’t hear. The developed system was compared for functionality and performance using the quality of the results measured in comparison with the expected results.
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- Authors: Sithole, M.P.P. , Nwulu, N.I. , Dogo, E.M.
- Date: 2019
- Subjects: Water quality , Sensors , IoT
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/${Handle} , uj:34290 , Citation: Sithole, M.P.P., Nwulu, N.I. & Dogo, E.M. 2019. Development of a wireless sensor network based water quality monitoring and notification system.
- Description: Abstract: In this paper, we present a water quality monitoring and notification system. It is also integrated with a consumer alert system on the safety of the water in accordance with the WHO water quality standard. The consumer alert system is made up of a buzzer for notification, a red-Light Emitting Diode (LED) and green-LED as an indicator for unsafe water and safe water respectively. Five sources of contaminants in water namely, soil, chlorine, vinegar, salt, washing powder and their combination were used in this to validate the performance of the system. Wireless communication between the measuring subsystem and the analysis and notification subsystem was established for mobility using radio frequency modules. The error in measurements and the consumption risk per water parameter were calculated on MS Excel as part of the analysis and presented in this document. This paper also presents an added functionality by using a Light Dependent Resistor (LDR) for turbidity measurement and LEDs in the notification subsystem. The notification system accommodates people with disabilities as the buzzer can be heard by those who can’t see, and the LEDs can be seen by those who can’t hear. The developed system was compared for functionality and performance using the quality of the results measured in comparison with the expected results.
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Thermal and flicker noise improvement in short-channel CMOS detectors
- Venter, Johan, Sinha, Saurabh
- Authors: Venter, Johan , Sinha, Saurabh
- Date: 2014
- Subjects: CMOS sensors , Detector development , Infrared detectors , Integrated circuits , Near infrared , Sensors , Simulations
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/374668 , uj:4735 , ISSN 0277-786X , http://hdl.handle.net/10210/11662
- Description: Integrated circuit (IC) technology has emerged as a suitable platform for infrared (IR) detector development. This technology is however susceptible to on-chip intrinsic noise. By using double-gate MOSFETs for detectors in the near-IR band, noise performance in the readout circuitry is improved, thereby enhancing the overall performance of these detectors. A 1 dB reduction in low-frequency noise is achieved, which is verified through simulations. It is shown that by using short-channel devices that noise improvement is furthermore obtained due to reduction in threshold voltage variation. The double-gate concept is applied in simulation to the three-transistor pixel topology and can also be implemented in other detector topologies such as the four-transistor pixel topology, since readout noise is not limited to specific IR detector topologies. The overall performance of near-IR detectors and the fill factor are significantly improved. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
- Full Text:
- Authors: Venter, Johan , Sinha, Saurabh
- Date: 2014
- Subjects: CMOS sensors , Detector development , Infrared detectors , Integrated circuits , Near infrared , Sensors , Simulations
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/374668 , uj:4735 , ISSN 0277-786X , http://hdl.handle.net/10210/11662
- Description: Integrated circuit (IC) technology has emerged as a suitable platform for infrared (IR) detector development. This technology is however susceptible to on-chip intrinsic noise. By using double-gate MOSFETs for detectors in the near-IR band, noise performance in the readout circuitry is improved, thereby enhancing the overall performance of these detectors. A 1 dB reduction in low-frequency noise is achieved, which is verified through simulations. It is shown that by using short-channel devices that noise improvement is furthermore obtained due to reduction in threshold voltage variation. The double-gate concept is applied in simulation to the three-transistor pixel topology and can also be implemented in other detector topologies such as the four-transistor pixel topology, since readout noise is not limited to specific IR detector topologies. The overall performance of near-IR detectors and the fill factor are significantly improved. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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