bluuebunny/crossref_metadata_2025 huggingface dataset:
Electrochemical Behavior of Low Loading Slurry Electrodes for Redox Flow Batteries
Authors: Tam Vincent , Wainright Jesse
Published: January 2023

The scalability of all-iron redox flow batteries is limited by the plating reaction at the negative electrode on charge. Slurry electrodes have been proposed to allow the plated metal to remain dispersed in the electrolyte and alleviate this limitation. Greater understanding is needed in how faradaic current is distributed between the slurry and the stationary electrode/current collector, especially at relatively low slurry particle loadings. In this work, experiments were conducted using three carbon powders (Kuraray YP-50F, SGL Carbon GFG20HP, and Fisher Scientific GP14736) dispersed in aqueous acidic electrolyte to investigate the effects of slurry particle size, shape, composition, and loading on the behavior of the iron (II/III) reaction. The slurries of YP-50F carbon particles were shown to significantly enhance the faradaic reaction rate due to their high specific surface area but failed to pull the majority of the faradaic current away from the stationary electrode due to the low conductivity of the percolated network. The two graphitic carbons’ slurries did not accelerate the reaction in the same way, but their higher electrical conductivity did succeed in allowing the faradaic reaction to occur primarily on the mobile slurry instead of the stationary current collector.
Managing Follicular Lymphoma in the Elderly Population
Authors: Tan Jiao Jie Cherie , Sze Yuen Lei , Choong Shi Hui Clarice
Published: January 2023

Follicular lymphoma (FL) is one of the most commonly diagnosed types of indolent non-Hodgkin lymphoma (NHL). The median age of diagnosis for FL is 65 years old. Although the median life expectancy after diagnosis is approximately 10 years, the incurable disease has a high risk of transformation. This case report focuses on an 80-year-old patient diagnosed with low-grade follicular lymphoma which subsequently transformed leading to the patient’s eventual demise as the patient took on the palliative intent. This case report aims to highlight the importance of clinical markers or prognostic factors to identify patients, specifically the elderly population who are at risk of transformation to aggressive forms when their FL remains at stage I-II phases. Currently, elderly patients with FL tend to be quickly dismissed with curative intent with chemotherapy, given their age and comorbidities, despite forming the majority of the population with follicular lymphoma. Age more than 60 years old has been shown to be one of the most powerful yet poor prognostic features in follicular lymphoma international prognostic index (FLIPI)—the main scoring system used for FL. Hence, further studies are required to look into the tailoring treatment for elderly patients with follicular lymphoma after risk stratifying them with appropriate clinical and prognostic markers.
Partial Substitution of Fish Meal with Soy Protein Concentrate on Growth, Liver Health, Intestinal Morphology, and Microbiota in Juvenile Large Yellow Croaker (Larimichthys crocea)
Authors: Wang Xuexi , Luo Hongjie , Wang Dejuan , Zheng Yunzong , Zhu Wenbo , Zhang Weini , Chen Zhengbang , Chen Xinhua , Shao Jianchun
Published: January 2023

The present study investigated the growth performance, feed utilization, intestinal morphology, and microbiota communities of juvenile large yellow croaker (Larimichthys crocea) fed diets containing different proportions of soy protein concentrate (SPC) (0, 15%, 30%, and 45%, namely FM, SPC15, SPC30, and SPC45) as a substitute for fish meal (FM) for 8 weeks. The weight gain (WG) and specific growth rate (SGR) in fish fed SPC45 were significantly lower than those fed FM and SPC15 but not differ with these fed SPC30. The feed efficiency (FE) and protein efficiency ratio (PER) decreased sharply when the dietary SPC inclusion level was higher than 15%. The activity of alanine aminotransferase (ALT) and expression of alt and aspartate aminotransferase (ast) were significantly higher in fish fed SPC45 than those fed FM. The activity and mRNA expression of acid phosphatase were opposite. The villi height (VH) in distal intestine (DI) showed a significant quadratic response to increasing dietary SPC inclusion levels and was highest in SPC15. The VH in proximal intestine, middle intestine decreased significantly with increasing dietary SPC levels. The 16S rRNA sequences in intestine revealed that fish fed SPC15 had higher bacterial diversity and abundance of Phylum Firmicutes such as order Lactobacillales and order Rhizobiaceae than those fed other diets. Genus vibrio, family Vibrionaceae and order Vibrionales within phylum Proteobacteria were enriched in fish fed FM and SPC30 diets. Tyzzerella and Shewanella that belongs to phylum Firmicutes and Proteobacteria, respectively, were enriched in fish fed SPC45 diet. Our results indicated that SPC replacing more than 30% FM could lead to lower quality diet, retard growth performance, ill health, disordered intestine structure, and microbiota communities. Tyzzerella could be the bacteria indicator of intestinal in large yellow croaker fed low quality diet due to high SPC content. Based on the quadratic regression analysis of WG, the best growth performance could be observed when the replacement of FM with SPC was 9.75%.
Predilation Ballooning in High Thrombus Laden STEMIs: An Independent Predictor of Slow Flow/No-Reflow in Patients Undergoing Emergent Percutaneous Coronary Revascularization
Authors: Kumar Rajesh , Qayyum Danish , Ahmed Ifikhar , Rai Lajpat , Mir Ayaz , Awan Romana , Naseer Ali Bin , Basit Abdul , Sial Jawaid Akbar , Saghir Tahir , Qamar Nadeem , Karim Musa
Published: January 2023

Background. Distal embolization due to microthrombus fragments formed during predilation ballooning is considered one of the possible mechanisms of slow flow/no-reflow (SF/NR). Therefore, this study aimed to compare the incidence of intraprocedure SF/NR during the primary percutaneous coronary intervention (PCI) in patients with high thrombus burden (≥4 grade) with and without predilation ballooning for culprit lesion preparation. Methodology. This prospective descriptive cross-sectional study included patients with a high thrombus burden (≥4 grades) who underwent primary PCI. Propensity-matched cohorts of patients with and without predilation ballooning in a 1 : 1 ratio were compared for the incidence of intraprocedure SF/NR. Results. A total of 765 patients with high thrombus burden undergoing primary PCI were included in this study. The mean age was 55.75 ± 11.54 years, and 78.6% (601) were males. Predilation ballooning was conducted in 346 (45.2%) patients. The incidence of intraprocedure SF/NR was significantly higher (41.3% vs. 27.4%;

p
<
0.001

) in patients with predilation ballooning than in those without preballooning, respectively. The incidence of intraprocedure SF/NR also remained significantly higher for the predilation ballooning cohort with an incidence rate of 41.3% as against 30.1% (

p
=
0.002

) for the propensity-matched cohort of patients without predilation ballooning with a relative risk of 1.64 (95% CI: 1.20 to 2.24). Moreover, the in-hospital mortality rate remained higher but insignificant, among patients with and without predilation ballooning (8.1% vs. 4.9%;

p
=
0.090

). Conclusion. In conclusion, predilation ballooning can be associated with an increased risk of incidence of intraprocedure SF/NR during primary PCI in patients with high thrombus burden.
Theoretical Performance Analysis of Inverted P3HT: PCBM Based Bulk Hetero-Junction Organic Solar Cells through Simulation
Authors: Husen Murad Jemal , Aga Fekadu Gochole , Dibaba Solomon Tiruneh
Published: January 2023

In this study, the role of active layer thickness, hole transport layer thickness, and electron mobility on the performance of P3HT: PCBM-based inverted organic solar cells has been investigated. The simulation has been done for device structure ITO/ZnO/P3HT: PCBM/MoO3/Ag using the general-purpose photovoltaic device model (GPVDM) program tool. The short circuit current density (Jsc), open circuit voltage (Voc), fill factor (FF), and power conversion efficiency (PCE) of the cell were determined by varying the thickness of the active layer from 140 nm to 260 nm, the hole transparent layer from 10 nm to 40 nm, and electron mobility from 0.5 × 10−3 cm2V−1s−1 to 6.5 × 10−3 cm2V−1s−1. The PCE improvement was observed at 220 nm and 20 nm active layer and hole transporting layer thickness, respectively, for 4.5 × 10−3 cm2V−1s−1 electron mobility. The results confirmed that the thickness of the active layer, hole transport layer, and charge carrier mobility plays an important role in the performance improvement of organic solar cells.
A Bibliometric Analysis of Research on Bacterial Persisters
Authors: Ju Yuan , Zhang Fang , Yu Pingjing , Zhang Yu , Zhao Ping , Xu Ping , Sun Luwei , Bao Yongqing , Long Haiyue
Published: January 2023

Background. In the past two decades, the surge of research on bacterial persisters has been inspired as increasingly concerning about the frequent failure of antibiotics treatment. This study was aimed at presenting a bibliometric and visualized analysis of relative publications on bacterial persisters, which offered insights into the development and research trends of this field. Methods. The Web of Science Core Collection and Ovid MEDLINE databases were utilized to retrieve relevant publications on bacterial persisters from 2001 to 2021. After manual selection, data including titles, authors, journals, author keywords, addresses, the number of citations, and publication years were subsequently extracted. The data analysis and visual mapping were conducted with Excel, SPSS, R studio, and VOSviewer. Results. In this study, 1,903 relevant publications on bacterial persisters were included. During 2001‐2021, there was an exponential growth in the quantity of publications. It was found that these studies were conducted by 7,182 authors from 74 different countries. The USA led the scientific production with the highest total number of publications (859) and citation frequency (52,022). The Antimicrobial Agents and Chemotherapy was the most influential journal with 113 relevant publications. The cooccurrence analysis revealed that studies on bacterial persisters focused on four aspects: “the role of persisters in biofilms,” “clinical persistent infection,” “anti‐persister treatment,” and “mechanism of persister formation.” Conclusion. In the past two decades, the global field of bacterial persisters has significantly increased. The USA was the leading country in this field. Mechanistic studies continued to be the future hotspots, which may be helpful to adopt new strategies against persisters and solve the problem of chronic infection in the clinic.
False Positive Tramadol Urine Testing in Patients Taking Fexofenadine: A Tale of Two Consecutive Cases
Authors: Yousuf Suhair Mohammed , Alater Ahmad Maaen , Alabdulla Majid , Osman Mugtaba
Published: January 2023

Urine drug screen immunoassays have been widely used as point-of-care testing for detection of various drug classes in substance use disorders. However, these immunoassays frequently result in false positive results. We report two patients that used 180 mg daily dose of fexofenadine hydrochloride for treatment of skin allergy and, falsely, tested positive for use of tramadol during urine drug screening. We recommend caution when interpreting positive tramadol urine screening among patients on fexofenadine treatment.
Sensitivity Analysis for a Redundant System with Random Inspection and
R
Repairmen Under Repair Pressure
Authors: Gao Shan , Wang Zongbin
Published: January 2023

This study examines a repairable

K

-out-of-

N
+
W

:

G

system with warm standby components and

R

repairmen, where common cause failure (CCF), random inspection, and a repair pressure coefficient are involved. Due to the typical non-self-announcement of the standby component’s failure, performing a random inspection on warm standby components is necessary to find whether there are failed standby components. When the number of failed components is larger than

R

(heavy loading occurs), all the repairmen increase their repair rates under a repair pressure coefficient to reduce the waiting queue and enhance the reliability and availability of the system. By adopting a matrix-analytic method and Markov renewal theory, this study provides the steady-state distribution and some reliability indices mean time to first failure time (MTTFF) and reliability function from the arbitrary initial state. By some numerical experiments, sensitivity analysis is finally given to show the effect of the system parameters on some performance measures.
An Exergame-Integrated IoT-Based Ergometer System Delivers Personalized Training Programs for Older Adults and Enhances Physical Fitness: A Pilot Randomized Controlled Trial
Authors: Lin Chih-Chun , Lin Yu-Sheng , Yeh Chien-Hsien , Huang Chien-Chun , Kuo Li-Chieh , Su Fong-Chin
Published: January 2023

Introduction: Regular physical exercise is believed to counteract the adverse physiological consequences of aging. However, smart fitness equipment specifically designed for older adults is quite rare. Here we designed an exergame-integrated internet of things (IoT)-based ergometer system (EIoT-ergo) that delivers personalized exercise prescriptions for older adults. First, physical fitness was evaluated using the Senior Fitness Test (SFT) application. Then, radio frequency identification (RFID) triggered the EIoT-ergo to deliver the corresponding exercise session based on the individual level of physical fitness. The exercise intensity during each workout was measured to generate the next exercise session. Further, EIoT-ergo provides an exergame to help users control and maintain their optimal cadence while engaging in exercise. Methods: This was a randomized controlled trial with 1:1 randomization. Participants were older adults, 50+ years of age (N = 35), who are active in their community. Participants in the EIoT-ergo group received a 12-week personalized exercise program delivered by EIoT-ergo for 30 min per session, with 2 sessions per week. Participants in the control group continued with their usual activities. A senior’s fitness test and a health questionnaire were assessed at baseline and at a 13-week reassessment. The Quebec User Evaluation of Satisfaction with Assistive Technology (QUEST) was used to evaluate the satisfaction of EIoT-ergo. Results: Compared with the control group, the EIoT-ergo group showed significant improvements in muscle strength (time-by-group interaction, sit-to-stand: β = 5.013, p < 0.001), flexibility (back stretch: β = 4.008, p = 0.005; and sit-and-reach: β = 4.730, p = 0.04), and aerobic endurance (2-min step: β = 9.262, p = 0.03). The body composition was also improved in the EIoT-ergo group (body mass index: β = −0.737, p < 0.001; and skeletal muscle index: β = 0.268, p = 0.03). Satisfaction with EIoT-ergo was shown in QUEST, with an average score of 4.4 ± 0.32 (5 for very satisfied). The percentage maximum heart rate in each session also indicated that EIoT-ergo can gradually build up the exercise intensity of users. Conclusions: EIoT-ergo was developed to provide personal identification, exergames, intelligent exercise prescriptions, and remote monitoring, as well as to significantly enhance the physical fitness of the elderly individuals under study.
Suspected Autosomal Recessive Polycystic Kidney Disease but Cerebellar Vermis Hypoplasia, Oligophrenia Ataxia, Coloboma, and Hepatic Fibrosis (COACH) Syndrome in Retrospect, A Delayed Diagnosis Aided by Genotyping and Reverse Phenotyping: A Case Report and A Review of the Literature
Authors: Sambharia Meenakshi , Freese Margaret E. , Donato Francisco , Bathla Girish , Abukhiran Ibrahim M.M. , Dantuma Maisie I. , Mansilla M. Adela , Thomas Christie P.
Published: January 2023

The clinical features of cerebellar vermis hypoplasia, oligophrenia, ataxia, coloboma, and hepatic fibrosis (COACH) characterize the rare autosomal recessive multisystem disorder called COACH syndrome. COACH syndrome belongs to the spectrum of Joubert syndrome and related disorders (JSRDs) and liver involvement distinguishes COACH syndrome from the rest of the JSRD spectrum. Developmental delay and oculomotor apraxia occur early but with time, these can improve and may not be readily apparent or no longer need active medical management. Congenital hepatic fibrosis and renal disease, on the other hand, may develop late, and the temporal incongruity in organ system involvement may delay the recognition of COACH syndrome. We present a case of a young adult presenting late to a Renal Genetics Clinic for evaluation of renal cystic disease with congenital hepatic fibrosis, clinically suspected to have autosomal recessive polycystic kidney disease. Following genetic testing, a reevaluation of his medical records from infancy, together with reverse phenotyping and genetic phasing, led to a diagnosis of COACH syndrome.
Localized Bullous Pemphigoid in a Patient with Acquired Reactive Perforating Collagenosis
Authors: Oka Masahiro
Published: January 2023

A 61-year-old man presented with 6-month and 5-day histories of multiple, pruritic nodular eruptions on the trunk and extremities and bullous eruptions on the left foot, respectively. The nodular eruptions had been treated with topical corticosteroids without improvement. He had been diagnosed with diabetes mellitus at the age of 42 years and had been suffering from end-stage renal disease for 1 year. Physical examination revealed scattered violet-brown papules and nodules on the trunk and extremities, many of which had central umbilicated necrosis or keratin plugs. Additionally, two tense bullae and five erosions were noted on the dorsal aspect of the left foot. Laboratory tests showed elevated levels of serum anti-bullous pemphigoid (BP)180 antibody. Histopathological findings of a nodule and a bulla were compatible with those of acquired reactive perforating collagenosis (ARPC) and BP, respectively. The papular and nodular lesions were diagnosed as ARPC, while bullous and erosive lesions were diagnosed as localized BP. The present case, together with previously reported cases of coexisting generalized BP and ARPC, suggests that coexistence of BP, regardless of whether generalized or localized, is significantly associated with ARPC.
Neue SLE-Klassifikationskriterien funktionieren bei Kindern
Authors: Aringer Martin
Published: January 2023

Importance/background: Several diagnostic criteria have been developed to effectively diagnose systemic lupus erythematosus (SLE). Three criteria are most common, namely the American College of Rheumatology (ACR)-1997, the Systemic Lupus International Collaborating Clinics (SLICC)-2012, and the European League Against Rheumatism (EULAR/ACR)-2019. Whether they also apply to juvenile SLE is unclear. Objective: To examine the diagnostic accuracy of ACR-1997, SLICC-2012, and EULAR/ACR-2019 for juvenile SLE. Data sources: A comprehensive search of PubMed, Cochrane, and Embase was conducted up to 26 March 2022. Study selection: We included all study designs in which patients had any index tests for ACR-1997, SLICC-2012, or EULAR/ACR-2019; both full-text papers and conference abstracts published in English were used. Exclusion criteria were as follows: (1) case reports; (2) adult subjects; or (3) did not report sufficient information to acquire true positive, false positive, true negative, and false negative values of diagnostic criteria. Data extraction and synthesis: Two authors independently screened studies, extracted relevant data, and assessed the risk of bias. Main outcomes and measures: First, a meta-analysis of the diagnostic accuracy of EULAR/ACR-2019 and a hierarchical summary receiver operating characteristic (HSROC) model was performed to estimate sensitivity and specificity with 95% confidence intervals (CIs). We then carried out a network meta-analysis to compare the performances of these three diagnostic criteria. Results: In total, 17 relevant studies that included 2339 juvenile SLE patients were eligible to analyze pooled accuracy. In the meta-analysis, 10 studies (1613 cases) reported the diagnostic performance of EULAR/ACR-2019, showing a pooled sensitivity of 0.92 (95% CI, 0.89–0.95), pooled specificity of 0.89 (0.77–0.95), and area under HSROC of 0.96 (0.94–0.97). In the network meta-analysis, the SLICC-2012 (0.94, 0.92–0.96) had the highest sensitivity, followed by EULAR/ACR-2019 (0.93, 0.90–0.95), and ACR-1997 (0.78, 0.72–0.82); the ACR-1997 (0.96, 0.92–0.98) demonstrated the highest specificity. EULAR/ACR-2019 (0.92, 0.87–0.96) and SLICC-2012 (0.92, 0.86–0.96) had the similar specificity. Conclusions and relevance: We found that the applicability of the new EULAR/ACR-2019 criteria in juvenile SLE is not yet the best diagnostic tool. Trial registration: PROSPERO CRD42022321514.
Optimizing regenerative braking on electric vehicles using a model-based algorithm in the antilock braking system
Authors: Budijono Agung Prijo , Sutantra I Nyoman , Pramono Agus Sigit
Published: January 2023

The regenerative braking effectiveness of electric vehicles (EVs), with
 8-25% range, requires designers to produce better braking systems. The antilock braking system (ABS) was chosen because it offers various advantages, such as enhanced safety considerations, vehicle maneuverability, and so on. The measurement findings revealed that ABS took longer to stop the wheels with the same wheel rotation speed. Because of the lesser differentiation of magnetic flux to time, it created lower induced emf in the generator. ABS 50 Hz performance was 19.5% at 4500 pm, whereas hydraulic brake performance was 21% at the same speed. ABS used model-based algorithms (MBAs) to boost the friction frequency with the wheels from 10 to 50 Hz. As the frequency increased, the ABS graph approached the hydraulic graph, and the ABS performance improved. Although ABS loses to hydraulics in stopping wheel rotation, it gains in saved energy and battery temperature. Longer wheel stop-times allow the rotational kinetic energy of the wheel more time to be converted into electricity.
Hybrid control mechanism-based DVR for mitigation of voltage sag and swell in solar PV-based IEEE 33 bus system
Authors: Setty Sowmyashree Narayana , Shashikala Mysore Subbakrishna Deekshit , Veeramanju Kalyan Thippeswamy
Published: January 2023

The power quality issues are raised due to sag/swell, which affects the overall performance of the grid-connected system. This study introduces the hybrid control mechanism based on a dynamic voltage restorer (DVR) to mitigate the sag and swell issues in the solar PV-based IEEE 33 bus system. The hybrid controller improves the dynamic performance and boosts the overall efficiency of the DVR system. The proposed work is also used to address the distribution system's voltage quality issues with minimal energy drawn out from the utility grid and effectively use solar energy. The sag and swell are introduced at the grid side and compensated at the load side by injecting DVR voltage. The proportional-integral (PI) controller followed by the fuzzy logic controller (FLC) is used to create the hybrid control mechanism for DVR. In this work, the solar PV system with DVR system is connected to the 29th location in the IEEE 33 bus system for performance realization. The hybrid control mechanism-based DVR provides 1.06% and 1.05% total harmonic distortion (THD) at sag and swell conditions for load voltage. The proposed work meets the IEEE 519 standards in terms of THD calculation. The proposed design compares with existing work and shows better THD reduction for load voltages.
An asynchronous interrupt driven sampling technique for a practical monitoring system of power-line single-phase voltage and current signals
Authors: Dharmawan Hari Arief , Wardoyo Arinto Yudi Ponco , Widodo Chomsin Sulistya
Published: January 2023

A practical monitoring system implementing an asynchronous interrupt driven sampling technique has been developed in this research. This system is intended to acquire power-line single-phase voltage and current signals as well as their related information such as RMS values and harmonic contents. The system uses a voltage transformer and a current transducer to acquire the signals of the voltage and current. A microcontroller is used in the system to perform acquisition processes, calculation, and wireless data transmission. The design activities include the development of hardware of the system and software in the microcontroller as well as monitoring software with Bluetooth technology that will run on portable devices. As part of the research, a new sampling technique was developed to provide constant and precise timings during the acquisition processes. In this technique, some peripherals related to the acquisition process were driven asynchronously using interrupt mechanisms. Some experimentation has been carried out, and the result showed that the system implementing this technique could successfully manage the timings for the synchronous acquisition sequences. Furthermore, the use of the Bluetooth interfaces in the system allowed practical monitoring process to be performed using portable devices.
Mitigation of supply current harmonics in fuzzy-logic based 3-phase induction motor
Authors: Sivakumar Arunachalam , Thiyagarajan Muthamizhan , Kanagarathinam Karthick
Published: January 2023

A parallel active power filter is employed to enrich the quality of power in the power grid with non-linear loads. The induction motor drive requires better performance in many applications. The overall performance enhancement is performed by mitigating the delivery of current harmonics and related warmness losses in an induction motor. In this paper, comprehensive performance evaluation of a 3-phase induction motor is mentioned with fuzzy logic controller-based shunt active filter (SAF), and the outcomes are compared with proportional integral (PI) and proportional derivative controller (PID) controller. In this work, a new scheme of shunt active filters is connected at the supply side of the vertical speed indicator VSI fed induction motor. The simulation was performed by a fuzzy logic controller (FLC) based 3-f induction motor drive (IMD) using parallel SAF. Simulation result from MATLAB/Simulink software has been presented to understand the reduction in harmonics by introducing an active filter near the supply side. A fuzzy suitable judgment controller is brought on this work to develop the induction motor dynamic response. Analysis of the simulation outcomes, the usage of MATLAB/Simulink software program for the proposed FLC managed induction motor had been demonstrated and overall performance enhancement of induction motor was discussed.
Simple formula for designing the PID controller of a DC-DC buck converter
Authors: Samosir Ahmad Saudi , Sutikno Tole , Mardiyah Luthfiyyatun
Published: January 2023

This paper proposes a simple way to design a proportional integral derivative proportional integral derivative (PID) controller for a DC-DC buck converter. This work concerns getting the formula to calculate Kp, Ki, and Kd parameters from a PID controller easily. The main advantage of this formula is that the tuning process of the KP, KI and KD parameters of the PID controller will be simplified just by entering the R, L, and C component values of the buck converter into the formula. The synthesis process of the formula is explained step by step. State space analysis is used to model the equations and transfer functions of the buck converter. The transfer function of the PID controller and buck converter was analyzed to obtain the Buck Converter system's closed loop transfer function. The formula for calculating the parameters KP, KI and KD of the PID controller is derived from the closed loop transfer function of the buck converter system. Numerical simulations are provided to confirm the effectiveness of the proposed PID controller. The performance of the buck converter controlled by the proposed PID controller was tested under various load conditions.
Coupling coefficient observer based on Kalman filter for dynamic wireless charging systems
Authors: Trung Nguyen Kien , Diep Nguyen Thi
Published: January 2023

In the dynamic wireless charging system for electric vehicles, the transfer efficiency reaches the maximum value when the load impedance is equal to the optimal impedance value. However, the optimal impedance value depends on the coupling coefficient, which varies with the electric vehicle's position. Therefore, to track the optimal impedance as well as to improve the transfer efficiency, it is necessary to know the coupling coefficient. This paper proposes a coupling coefficient observer method based on the Kalman filter. Then, on the secondary side, an optimal impedance controller acts on the active rectifier to improve efficiency. The results show that the estimation method achieves high accuracy. The estimated error of the mutual inductance is less than 5% in both the case of impact measurement noise and change system parameters. System efficiency improved by 3.2% compared with the conventional estimation method.
Low-cost energy conservation measures power saving impact on electronic appliances usage
Authors: Tyagi Ruchi , Ali Shaikh Shamser , Vishwaakarma Suresh
Published: January 2023

Energy conservation measures use less energy to reduce costs and the environmental impact without compromising the consumer’s comfort level. Low-cost energy conservation measures play a critical role in power saving on the usage of electronic devices. The paper compares two different facilities using air-conditioning applications to study the impacts of low-cost energy conservation measures (LCECM) in real-time operations. The effect was recorded at both facilities by lowering the air-conditioning running time and increasing its set temperature ensuring that there was no compromise in occupants’ comfort level. As per international performance measurement and verification (IPMV) protocol A, data analysis was done using pre- and post-experiment readings. IPMVP output was analyzed more by running a
 t-Test in the SPSS software. Results indicated energy conservation with a cumulative impact on carbon footprint, environment, and cost of importing fossil fuel. The limitations of this study are that the energy conservation measurements were made with limited facilities and respondents' restrictions.
Optimal sizing of standalone for hybrid renewable energy system by using PSO optimization technique
Authors: Al-Shammari Zaidoon Waleed Jawad , Azizan Muhammad Mokhzaini , Rahman Ahmad Shukri Fazil , Hasikin Khairunnisa
Published: January 2023

Providing electricity to rural regions is difficult for developing countries, such as Iraq, particularly in remote parts without grid connections. The electrical demands of Zerbattiya, a community in southern Iraq near the Iranian border, are discussed in this paper. The proposed system includes wind turbines, solar panels, diesel engines, batteries, etc. This study suggests a techno-economic viable and optimal size for each component to generate electricity for this area. This research uses particle swarm optimization techniques (PSO). The best hybrid renewable energy system (HRES) design is achieved by balancing the lowest possible cost of energy (COE) with the lowest possible loss of power supply probability (LPSP) and the greatest possible reliability factor value. As a result of the findings, the respective ideal values of number of photovoltaics (NPV), number of wind turbines (NWT), number of diesel generator (NDG), number of batteries (NBT), COE, LPSP, and reliability are 138, 43, 2, 324, US$/KWh 0.129, 0.0508%, and 99.9492%, respectively. Finally, it was discovered that implementing a HRES is an effective way to address the electrical demands of remote rural regions in Iraq and other developing countries with similar climates.
Simulation and prediction of residential grid-connected photovoltaic system performance
Authors: Ibrahim Siti Nor Nadhirah , Zainuddin Hedzlin , Rahim Yang Ilya Akila Abdul , Mansor Nur Awliyah , Muhammad Nurmalessa , Khir Farah Liyana Muhammad
Published: January 2023

This paper presents the analysis of the actual, predicted, and simulated technical performance of a residential 2.835 kWp retrofitted grid-connected photovoltaic (GCPV) system under the feed-in-tariff (FiT) scheme in Klang, Malaysia located in the equatorial region. The technical performance indices of the GCPV system were assessed based on the three-year energy production in 2018, 2019 and 2020. The actual and predicted technical performance were calculated using SEDA mathematical model, which the solar irradiation data was acquired from PVsyst software. Meanwhile, the simulated technical performance was obtained using PVsyst software. The results showed that the prediction using mathematical model has higher percentage difference within the range of 12.54-13.29%, compared to PVsyst simulation that was within 7.93-11.93%. This study has highlighted the factors that contributed to the technical performance underprediction of both mathematical model and PVsyst simulation, which are the estimation of losses and annual irradiation data accuracy. Lastly, the FiT gross income calculated for the three consecutive years were within the range of 3310.80 MYR and 3357.30 MYR. This FiT gross income result conveys an example of Malaysian case study, to enlighten the public, on the economic aspect of installing GCPV system under FiT scheme.
Maximum power point tracker using an intelligent sliding mode controller of a photovoltaic system
Authors: Abboud Sarah , Habachi Rachid , Boulal Abdellah , Alami Semma El
Published: January 2023

The operating performance of a PV module/array is extremely reliant on the weather (temperature/irradiation) and non-linear. Thus, to ensure that the PV array produces the maximum possible power at any time and regardless of the external conditions, maximum power point tracking (MPPT) techniques are required. The solution suggested in this paper involves taking into account two cascaded controllers as follows; the incremental conductance (INC) controller, which is intended to provide a reference proportional to the PV array's optimal power PMPP, and the sliding mode control (SMC), which is in charge of controlling the GPV voltage. The strategy of the SMC is to design a sliding surface that defines the operating point. The SMC combined with the INC aims to achieve fast MPPT action on PV systems using cascade control. The proposed controller is robust to changing weather conditions. In order to evaluate what is done, the results are compared with the INC+PI controller. When an abrupt change occurs, the SMC has a low transient and arrives to equilibrium sooner than the INC+PI controller. the results are presented by the PSIM software, and demonstrate the SMC controller's performance while confirming that the new approach has increased both production and energy efficiency.
Analysis of oscillating water column technology in East Nusa Tenggara Indonesia
Authors: Nugraha I Made Aditya , Desnanjaya I Gusti Made Ngurah , Siregar Jhon Septin Mourisdo , Boikh Lebrina Ivantry
Published: January 2023

Utilization of new renewable energy can be one solution to the limitations of fossil energy. Ocean wave energy is renewable energy caused by tides, and this potential can be utilized as a source of electrical energy in Indonesia, especially East Nusa Tenggara. This ocean wave power plant uses oscillating water column (OWC) technology. This wave energy is energy that can be developed and environmentally friendly and available every time. This paper analyzes the amount of energy produced by ocean waves using OWC technology in the East Nusa Tenggara. The benefits of this paper can be used as a reference for planning the construction of a wave power plant around East Nusa Tenggara. The method used is to measure the condition of ocean waves for a year and analyze the amount of energy and electrical power that can be generated by ocean waves with the use of OWC. The results of the analysis show that the use of ocean wave power plants with OWC technology in the waters of East Nusa Tenggara can produce the highest energy of 20,291,728.83 Joules and the lowest is 17,062.62 Joules. The electrical power generated is between 3,645.45 Watt to 4,274,314.37 Watt, and average of power density by ocean waves using OWC is 19,021.89 Watt/m2.
Fuzzy type two self-tuning technique of single neuron PID controller for brushless DC motor based on a COVID-19 optimization
Authors: Ghany Mohamed A. Abdel , Shamseldin Mohamed A.
Published: January 2023

This paper presents an efficient interval type 2 fuzzy (IT2F) based on a single neuron proportional–integral–derivative (PID), also known as IT2FSNPID controller. The main purpose of the proposed control technique is to track the motion profile of the brushless DC (BLDC) motor. Also, a comparative study was investigated fuzzy type 1 (FT1) and IT2F. IT2F can treat the uncertainty and nonlinearity of the BLDC motor drive electric system in contrast to FT1. The parameters of each control technique were obtained using a new COVID-19 optimization algorithm according to an objective function. Moreover, several tests had been performed to ensure the ability of fuzzy type to absorb the system uncertainty and nonlinearity. All controllers were utilized to operate the BLDC motor sudden change in load and continuous load. The simulation results show that the IT2FSNPID can improve the dynamic response of linear and nonlinear of the same BLDC motor and accommodate the system uncertainty significantly.
Accounting for magnetic saturation in designing a SRM speed controller for torque ripple minimization
Authors: Boumaalif Youness , Ouadi Hamid
Published: January 2023

This study established a nonlinear control design for switched reluctance motor (SRM) vehicle applications, using the backstepping approach. The suggested controller is established according to a model that consider magnetic saturation while reducing torque ripple and resulting in less vibrations. To optimize torque ripple, control angles are adjusted based on the machine speed and torque measurements. Indeed, a lookup table is constructed, offering the efficient control angles for various motor operating points. The suggested control technique was validated through simulation, exploiting an accurate MATLAB SRM model considering magnetic saturation effects. To illustrate the superiority of the suggested regulator, a comparison of its performance with a proportional-integral (PI) controller was performed. The acquired findings indicate the suggested regulator’s effectiveness.
Financial Resiliency of the Top Three Listed Companies in the Philippine Stock Exchange
Authors: Sasan Caren C. , Polinar Mark Anthony N. , Serafin Ellen G. , Mahinay Socorro T.
Published: January 2023

The adverse effects of the ongoing pandemic caused big corporations to incur financial losses, which resulted in shrinkage of sales, increasing costs, and retrenchment. The entities' financial resilience was questioned, challenged, and business operations were paralyzed during the pandemic. Based on their market capitalization, this paper examined the top three listed companies in the Philippine Stock Exchange’s selected financial ratios if there were significant differences before and during the pandemic. Quantitative research using secondary data was used to quantify the mean and paired t-test based on the selected financial ratios. The results revealed that the current ratio, quick ratio, debt ratio, debt to equity, asset to equity, net profit margin, and return on assets had no significant effect on financial performance before and during the pandemic. Eventually, the return on equity showed a significant effect in the study. Therefore, presenting the findings, the study concluded that these companies were inefficient in generating profits and had a significantly high level of debt during the Covid-19 pandemic. Furthermore, a discussion about the benefits for the policymakers, potential and existing investors, and future researchers was also provided.
The Senior High School Student-Mothers in the New Normal: Understanding their Lived Experiences on Modular Distance Learning
Authors: Aceret Dan Manayon T. , Delos Reyes Mitch Joe V. , Ocampo Anna Vanessa , Valencia Mark Janree L.
Published: January 2023

Balancing motherhood and academic life are a difficult task - being a mother is a demanding role, and being a student is also demanding. With the advent of the new learning modality, specifically modular distance learning, SHS student-mothers face a whole new circumstance in addition to their existing dual roles. This case study explored the lived experiences of five senior high school student mothers in the modular distance learning. Participants met the inclusion criteria of a student mother, which includes (1) a student-mother under the General Academic Strand in a Public Stand-alone Senior High School of the School of the Schools Division of the City of Batac; (2) a working student mother and living with her child;  and  (3)  willingness to participate in the study. Four major themes emerged in the participants' lived experiences, which include (1) struggles with dual roles, (2) learning challenges, (3) realizations, and (4) a strong support system. The findings revealed that the participants faced adversities and struggles as mothers and students and remained more steadfast and resilient in fulfilling their dreams of finishing their senior high school and receiving a basic education diploma amid the pandemic. Hence, the lived experiences of student mothers have established baseline data for developing educational programs and guidance services that can meet the needs of student mothers amid the pandemic.
The Influence of Manpower, Information Technology and Intellectual Property Rights on Creative Economy Growth in Java Island
Authors: Insana Dwi Rorin Mauludin , Yolanda Yolanda , Susilastuti Darwati
Published: January 2023

The era of the industrial revolution 4.0 was marked by the development of the information economy era accompanied by the proliferation of new discoveries in the fields of technology, information, and communication. In this era, the creative economy is growing. In addition to the use of information technology, the creative economy prioritizes workers who have ideas and creativity, so the protection of intellectual property rights is very important in the growth and development of the creative economy. The purpose of this study is to identify, study, analyze, find and describe the influence of labor, information technology and intellectual property rights on creative economic growth in Java. This study uses secondary data in the form of panel data consisting of 6 provinces in Java for the period 2010-2019. Data analysis used panel data regression. The results of data analysis show that partially or simultaneously labor, information technology and intellectual property rights have a positive and significant influence on the growth of the creative economy in Java. The results of this study are expected to be input for the provincial government in Java to better support and assist creative economy actors to obtain legal protection for intellectual property rights and play a more active role in increasing the quantity and quality of creative and innovative human resources as well as mastering information technology and infrastructure provision. more adequate information technology for the development of the creative economy.
Empowering Speaking Skill through Debate: The Case of Afghan EFL Learners at Herat University
Authors: Noor Shagofah , Tajik Omid
Published: January 2023

Using a quantitative approach, this study investigated the impacts of debate on students’ speaking skills in English-language classes at the English Department, Herat University, Afghanistan. The study participants were 44 sophomore students (28 girls and 16 boys). To understand participants’ speaking levels, researchers had a pre-test followed by a six-week treatment of having debates in the speaking class. For measuring the impacts of debate, a speaking post-test was taken. To investigate the impacts of debate on students’ speaking skills the researchers created an online questionnaire form and the link was shared with students in speaking classes. The questionnaire enriched this study with essential information after the treatment. The data were analyzed through SPSS 25. A paired sample t-test was used to measure the degree to which students’ speaking skills developed throughout the six-week debate program, and students’ responses to the online questionnaire were analyzed by calculating the percentage of each item. The results of the present study indicate that debate had a positive impact and enhanced students’ speaking skills. The participants also reflected that debate had improved their critical thinking, helped them practice new language skills and arguments, developed collaboration, and decreased their speaking anxiety while having fun.
Ações de terapia ocupacional em saúde mental para pacientes internados em hospital geral impacto sobre o funcionamento ocupacional
Authors: Tedesco Solange Aparecida , Nogueira-Martins Luiz Antônio , Citero Vanessa de Albuquerque
Published: January 2023

Introdução: A Terapia Ocupacional (TO) em saúde mental favorece o cuidado ao paciente em situações de adversidade decorrentes da hospitalização. Objetivo: Avaliar o impacto da abordagem em TO sobre o funcionamento ocupacional especificamente nas dimensões de causalidade pessoal, valores, interesses, papéis, hábitos, habilidades e meio ambiente de pacientes internados em hospital geral provenientes de um serviço de interconsulta psiquiátrica. Método: Estudo longitudinal que avaliou o funcionamento ocupacional, antes e após a intervenção em TO, verificando o impacto sobre estratégias utilizadas para lidar com as dificuldades com a internação por, no mínimo, cinco sessões. Os dados foram obtidos dos registros do serviço e pela Autoavaliação do Funcionamento Ocupacional (SAOF). Resultados: As médias de todas as dimensões de funcionamento ocupacional após as intervenções foram maiores do que as médias inicias (p<0,05). Conclusão: A abordagem em TO no contexto da interconsulta psiquiátrica possibilita a ampliação das dimensões que compõem diferentes sistemas do desempenho do paciente internado em hospital geral.
Diretrizes da prática do cuidado de indivíduos pós-ave em contexto hospitalar na perspectiva de profissionais de saúde e cuidadores
Authors: Lousada Mariana Lima da Silva , Vieira Juliany Silveira Braglia César , Barbosa Leopoldo Nelson Fernandes
Published: January 2023

Esta pesquisa foi fruto de uma dissertação e buscou sugerir diretrizes para a elaboração de um manual de cuidados direcionados a pacientes pós-AVE, em contexto hospitalar, com base na perspectiva dos profissionais de saúde e cuidadores. Trata-se de um estudo qualitativo com quarenta entrevistas individuais. A transcrição das entrevistas foi realizada através da Técnica de Análise de Conteúdo e apontou: necessidade de suporte para a execução das AVD e suporte psicológico para o cuidador; habilidades relacionadas aos aspectos práticos e afetivos do cuidado; conhecimento sobre o AVE e AVD para a capacitação. Recomenda-se a criação e utilização de manuais de orientação para cuidadores de pacientes pós-AVE.