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A computed river flow-based turbine controller on a programmable logic controller for run-off river hydroelectric systems
(MDPI, 2017)
Jidin R.
;
Othman A.B.
;
6508169028
;
49561714800
The main feature of a run-off river hydroelectric system is a small size intake pond that overspills when river flow is more than turbines' intake. As river flow fluctuates, a large proportion of the potential energy is wasted due to the spillages which can occur when turbines are operated manually. Manual operation is often adopted due to unreliability of water level-based controllers at many remote and unmanned run-off river hydropower plants. In order to overcome these issues, this paper proposes a novel method by developing a controller that derives turbine output set points from computed mass flow rate of rivers that feed the hydroelectric system. The computed flow is derived by summation of pond volume difference with numerical integration of both turbine discharge flows and spillages. This approach of estimating river flow allows the use of existing sensors rather than requiring the installation of new ones. All computations, including the numerical integration, have been realized as ladder logics on a programmable logic controller. The implemented controller manages the dynamic changes in the flow rate of the river better than the old point-level based controller, with the aid of a newly installed water level sensor. The computed mass flow rate of the river also allows the controller to straightforwardly determine the number of turbines to be in service with considerations of turbine efficiencies and auxiliary power conservation. � 2017 by the authors.
2
The Effect of Cyber security Knowledge on Employees� Personal Growth: An empirical Study in private hospitals in Libya and Yemen
(Tarbiat Modares University, 2022)
Ali A.M.A.
;
Musaed A.-M.M.N.
;
Alias R.B.
;
57804246900
;
57803720400
;
55916909500
This paper focused on the effect of cyber security knowledge CSK on employees� personal growth PG in private hospitals in Libya and Yemen. Employees were evaluated for their responses to cyber practice, cyber threats targeting end-users in the healthcare industry (i.e., malware, social engineering, spam, phishing, and ransomware), and cyber awareness. The descriptive analytical approach was used to determine the relationship between the independent CSK and dependent variable PG, the current study took place in March 2021 and was applied to a stratified random sample of 164 managers from the middle and lower management. Results indicated a lack of understanding of cyber threats and recommended mitigations and uncertainty regarding applicable legislation governing electronic patient information; also, the level of CSK & PG in the studied hospitals was low. The findings also show that CSK positively affects employees� PG beyond the demographic differences in respondents. Finally, a set of recommendations for effective based cyber security implementations and training programs were presented and discussed. � 2022, Tarbiat Modares University. All rights reserved.
22
Effect of deep-level defect density of the absorber layer and n/i interface in perovskite solar cells by SCAPS-1D
(Elsevier B.V., 2020)
Chowdhury M.S.
;
Shahahmadi S.A.
;
Chelvanathan P.
;
Tiong S.K.
;
Amin N.
;
Techato K.
;
Nuthammachot N.
;
Chowdhury T.
;
Suklueng M.
;
57224213317
;
55567116600
;
35766323200
;
15128307800
;
7102424614
;
25321184300
;
57204889352
;
57221420455
;
55896993000
In this paper, Solar Cell Capacitance Simulator-1D (SCAPS-1D) was used to study the absorber layer defect density and n/i interface of perovskite solar cells versus various cell thickness values. The planar p-i-n structure was defined as PEDOT:PSS/Perovskite/CdS, and its performance was simulated. Power conversion efficiency >25% can be achieved at <1014 cm?3 defect density and >400 nm thickness of absorber layer, respectively. The study assumed 0.6 eV Gaussian defect energy level below the perovskite's conduction band with a characteristic energy of 0.1 eV. These conditions resulted in an identical outcome on the n/i interface. These results show constraints on numerical simulation for correlation between defect mechanism and performance. � 2019 The Authors
2
Improving Event Classification Using Gammatone Filter For Distributed Acoustic Sensing
(Universiti Malaysia Perlis, 2021)
Faisal B.
;
Yusri M.S.
;
Ismail A.
;
Saleh N.L.
;
Ismail M.F.
;
Nordin N.D.
;
Sulaiman A.H.
;
Abdullah F.
;
Jamaludin M.Z.
;
57209973264
;
57480859600
;
36023817800
;
57198797134
;
57211721986
;
57217851042
;
36810678100
;
56613644500
;
57216839721
The phase optical time domain reflectometry (?-OTDR) system offers several advantages suitable for distributed acoustic sensing application. It has long sensing range, great anti-electromagnetic interference, and high sensitivity towards environmental vibrations. However, as a sensor system, the ?-OTDR is limited to only collecting environmental vibrations without providing more useful information such as the location and types of events happening around the sensing region. Therefore, it requires an extensive data processing system to distinguish between different events happening within the sensing regions. In this paper, Simple Differential and Normalized Differential method were used to extract perturbation event prior to classification process comprising data organization, features extraction, and classification outcome were implemented. Gammatone Frequency Cepstral Cepstrum were used to handcraft features for classification and were obtained using Gammatone Filter processing. Classification scheme based on Support Vector Machine (SVM) is use as classifier where accuracy score 100%. � 2021, Universiti Malaysia Perlis. All rights reserved.
4
OPERATIONAL AND HYGIENE PROBLEMS DUE TO POOR FLOOR DRAIN DESIGN AND INSTALLATION IN A MEAT PROCESSING
(Consulting and Training Center - KEY, 2021)
Shan H.H.
;
Hasnan N.Z.N.
;
Md. Yusoff Y.
;
Aziz N.A.
;
Basri M.S.M.
;
57850471100
;
57209140758
;
57849284400
;
57850714700
;
57219896653
The proper design and installation of the floor drain, not only in meat processing but also in a major food establishment, were often given lack of thought in relation to food properties, processing environment and it is treated as a common drainage system just like in other industries. Subsequently, poor drainage is built, which does not meet the operational and hygienic requirement. This study has investigated the severity of floor drainage problem to the operation of a food factory in Malaysia producing frozen meat patties. The hydraulic efficiency of the drain was determined based on the changing wastewater head above the drain and open grate area, while the cleaning efficacy was analyzed based on adenosine triphosphate (ATP) bioluminescence assay expressed in relative light units (RLU), and standard plate count method for: aerobic mesophilic bacteria, Escherichia coli, Salmonella spp., Listeria spp. and Listeria monocytogenes. The study found that the poor design of the drain-grate has led to rapid blockages and caused hydraulic efficiency to reduce to 21.37% during operation. The wastewater later flooded the floor surfaces up to 15.1 mm which posed slip, trip and fall risk to the workers and fatigue in walking especially when carrying loads. Additionally, the inappropriate installation and absence of hygienic design caused the drain to be ineffectively cleaned. This resulted in unacceptable surface contamination, ranging from 3,793 to 11,657 RLU/100 cm2. The drain was also highly contaminated with aerobic mesophilic bacteria (8.1 � 104-5.3 � 106 CFU/cm2), Escherichia coli (up to 25 CFU/cm2) and the presence of Listeria spp. Salmonella spp. and Listeria monocytogenes were however not detected. Consequently, the factory has experienced daily production interruption, labour wastage due to the need for frequent drain cleaning, fatigued operators, falling incidents, unsatisfactory food safety audit and cross-contamination. The study ended with the development and provision of checklists, consisting of multiple comprehensive criteria to guide the studied factory in monitoring the design and installation of their future gully-drain for preventing inefficient drainage and contamination. The checklists can also be adopted by other food manufacturers with similar processing. � 2021, Consulting and Training Center - KEY. All rights reserved.
1
Passive edge tracing of deformable object by robot
(Fuji Technology Press, 2011)
Sahari K.S.M.
;
Seki H.
;
Kamiya Y.
;
Hikizu M.
;
57218170038
;
7202492680
;
35508847400
;
6506780601
Usage of active tracing method to find a second corner has been proven to be efficient in finding a second corner next to the first found corner. Passive tracing is a method where the tracing gripper is static while another gripper holding the first corner maneuvers according to the feedback from sensors inside the static gripper so that it pulls the clothes appropriately for the static gripper, with adequate force control, to trace the edge of the clothes. Vision sensor is used from time to time to check whether the static gripper has reached the second corner or not.
3
Physiochemical and electrical properties of refined, bleached and deodorized palm oil under high temperature ageing for application in transformers
(MDPI, 2018)
Mohamad N.A.
;
Azis N.
;
Jasni J.
;
Kadir M.Z.A.A.
;
Yunus R.
;
Yaakub Z.
;
57192066472
;
56120698200
;
25632671500
;
25947297000
;
6603243672
;
56602940600
This paper presents a high temperature ageing study of refined, bleached, and deodorized palm oil (RBDPO) olein at 170?C in the presence of air. In total, two types of RBDPO were examined. The physiochemical and dielectric properties of RBDPO were measured and analysed. We found that the moisture and viscosities for both RBDPO increased as the ageing progressed, whereas the acidities fluctuated at very low levels at less than 0.005 mg KOH/g. The ageing on the AC breakdown voltages of both RBDPO were not affected throughout the ageing processes. The dielectric dissipation factors and relative permittivities for both RBDPO increased as the resistivities decreased with the ageing time.
3
University budget versus students
(Maejo University, 2017)
Sorooshian S.
;
Yahaghi J.
;
57200073619
;
57190000250
[No abstract available]
2

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