bluuebunny/crossref_metadata_2025 huggingface dataset:
Brain Tissue Oxygen Levels as a Perspective Therapeutic Target in Traumatic Brain Injury. Retrospective Cohort Study
Authors: Roman Gal , Hrdy Ondrej , Vrbica Kamil , Hudec Jan , Mrlian Andrej , Smrcka Martin
Published: February 2023

Introduction

Management of traumatic brain injury (TBI) requires a multidisciplinary approach and represents a significant challenge for both neurosurgeons and intensivists. The role of brain tissue oxygenation (PbtO2) monitoring and its impact on posttraumatic outcomes remains a controversial topic.

Aim of the study

Our study aimed to evaluate the impact of PbtO2 monitoring on mortality, 30 days and 6 months neurological outcomes in patients with severe TBI compared with those resulting from standard intracranial pressure (ICP) monitoring.

Material and methods

In this retrospective cohort study, we analysed the outcomes of 77 patients with severe TBI who met the inclusion criteria. These patients were divided into two groups, including 37 patients who were managed with ICP and PbtO2 monitoring protocols and 40 patients who were managed using ICP protocols alone.

Results

There were no significant differences in demographic data between the two groups. We found no statistically significant differences in mortality or Glasgow Outcome Scale (GOS) scores one month after TBI. However, our results revealed that GOS scores at 6 months had improved significantly among patients managed with PbtO2; this finding was particularly notable for Glasgow Outcome Scale (GOS) scores of 4–5. Close monitoring and management of reductions in PbtO2, particularly by increasing the fraction of inspired oxygen, was associated with higher partial pressures of oxygen in this group.

Conclusions

Monitoring of PbtO2 may facilitate the appropriate evaluation and treatment of low PbtO2 and represents a promising tool for the management of patients with severe TBI. Additional studies will be needed to confirm these findings.
Early Lactate Clearance as a Determinant of Survival in Patients with Sepsis: Findings from a Low-resource Country
Authors: Rehman Fazal , Zafar Saad Bin , Aziz Adil , Aziz Abdul , Memon Pirbhat Shams , Ejaz Taymmia , Aziz Summaira
Published: February 2023

Background

Single lactate measurements have been reported to have prognostic significance, however, there is a lack of data in local literature from Pakistan. This study was done to determine prognostic role of lactate clearance in sepsis patients being managed in our lower-middle income country.

Methods

This prospective cohort study was conducted from September 2019-February 2020 at the Aga Khan University Hospital, Karachi. Patients were enrolled using consecutive sampling and categorized based on their lactate clearance status. Lactate clearance was defined as decrease by 10% or greater in repeat lactate from the initial measurement (or both initial and repeat levels <=2.0 mmol/L).

Results

A total 198 patients were included in the study, 51% (101) were male. Multi-organ dysfunction was reported in 18.6% (37), 47.7% (94) had single organ dysfunction, and 33.8% (67) had no organ dysfunction. Around 83% (165) were discharged and 17% (33) died. There were missing data for 25.8% (51) of the patients for the lactate clearance, whereas 55% (108) patients had early lactate clearance and 19.7% (39) had delayed lactate clearance.On univariate analysis, mortality rate was higher in patients with delayed lactate clearance (38.4% vs 16.6%) and patients were 3.12 times (OR = 3.12; [95% CI: 1.37-7.09]) more likely to die as compared with early lactate clearance. Patients with delayed lactate clearance had higher organ dysfunction (79.4% vs 60.1%) and were 2.56 (OR = 2.56; [95% CI: 1.07-6.13]) times likely to have organ dysfunction. On multivariate analysis, after adjusting for age and co-morbids, patients with delayed lactate clearance were 8 times more likely to die than patients with early lactate clearance [aOR = 7.67; 95% CI:1.11-53.26], however, there was no statistically significant association between delayed lactate clearance [aOR = 2.18; 95% CI: 0.87-5.49)] and organ dysfunction.

Conclusion

Lactate clearance is a better determinant of sepsis and septic shock effective management. Early lactate clearance is related to better outcomes in septic patients.
Association of HLA class II alleles with suicidal behavior in a Transylvanian population
Authors: Vuscan Mihaela Elvira , Vica Mihaela Laura , Balici Stefana , Nicula Gheorghe Zsolt , Rusu Sergiu Ionica , Siserman Costel Vasile , Coman Horia George , Matei Horea Vladi
Published: February 2023

Background: Suicide is a complex phenomenon determined by the interaction of various risk factors. The Major Histocompatibility Complex is the most polymorphic gene cluster of the entire human genome, being linked to both the regulation of the immune system and various psychiatric diseases. The aim of this study was to identify HLA-DQB1 and DRB1 alleles and genotypes susceptible to influence suicidal behavior.

Methods: We explored the association of HLA-DQB1 alleles with the suicidal behavior on a sample of 427 individuals (including 110 suicide attempters) from Transylvania, as well as the association of HLA-DRB1 alleles with the suicidal behavior on a sample of 271 individuals (including 50 suicide attempters), using the single specific primer-PCR (SSP-PCR) technique.

Results: We found that the HLA-DQB1*02, *03 and *06 alleles, the DQB1*02/*03, DQB1*02/*06, DRB1*12/*15 and DRB1*07/*13 genotypes, as well as the DQB1*06~DRB1*07 and DQB1*02~DRB1*13 haplotypes, were more frequent in suicide attempters. In contrast, the HLA-DQB1*04 and DQB1*13 alleles, the DQB1*02/*05 and DQB1*03/*05 genotypes and the DQB1*03~DRB1*13 haplotype were less frequent in the case group.

Conclusion: HLA-DQB1*02, *03 and *06 alleles and the DQB1*02/*03 and *02/*06 genotypes are susceptible to favor a suicide behavior, while the HLA-DQB1*04 and *13 alleles and the DQB1*02/*05 and *03/*05 genotypes were protective against such behavior. A similar analysis regarding the HLA-DRB1 alleles detected a possible risk for suicidal behavior among individuals possessing either the DRB1*12/*15 or the DRB1*07/*13 genotypes. DQB1*06~DRB1*07 and DQB1*02~DRB1*13 haplotypes were found susceptible to favor a suicidal behavior, while DQB1*03~DRB1*13 exhibited a protective influence.
The metabolic control and laboratory evaluation in patients with type 2 diabetes during the COVID-19 pandemic and the impact of telemedicine: a single-center experience
Authors: Onea Corina Roxana , Erőss Ákos , Roiban Andrada Larisa , Cernea Simona
Published: February 2023

Objective: The study aimed to evaluate the metabolic control during the COVID-19 pandemic in subjects with type 2 diabetes mellitus (T2DM) and whether care through telemedicine significantly impacted it.

Material and methods: This was a retrospective study for which three time-periods were prespecified: the COVID-19 pandemic period, pre-COVID-19 period, and before pre-COVID-19. The following information were collected: anthropometric and laboratory parameters (glycated hemoglobin (HbA1c), blood glucose, lipid profile, creatinine, eGFR, etc.), self-measured blood glucose (SMBG), blood pressure (BP), diabetes therapy, number of on-site and of telemedicine consultations. The mean values of all available measurements for HbA1c, SMBG, BP, weight, and body mass index (BMI) were calculated.

Results: During the COVID-19 pandemic, the HbA1c values increased (6.78±0.77% to 6.96±0.87%, p<0.0001; + 0.18±0.67%), despite treatment intensification (p<0.01), while BMI and total cholesterol values slightly decreased (32.01±5.5 kg/m2 to 31.7±5.4 kg/m2, p<0.0001, and 178.1±40.8 mg/dl to 170.5±38.4 mg/dl, p<0.05). The deterioration of glycemic control (to HbA1c >7%) were rather seen in males (to 7.01±0.92%, p<0.0001), patients from rural areas (to 7.08±0.96%, p<0.001) and younger than 65 y.o. (to 7.05±0.82%, p<0.001). More male patients had a mean HbA1c increase of >0.5% during the COVID-19 pandemic (32.3% vs 21.5%, p<0.05). Patients who received more diabetes care visits through telemedicine had a more attenuated increase in HbA1c (6.79±0.80% to 6.90±0.83%, p<0.05 vs 6.76±0.72% to 7.08±0.92%, p<0.0001).

Conclusions: The glycemic control slightly deteriorated during the COVID-19 pandemic (but with overall HbA1c within target), with certain patient categories being more affected. Diabetes care though telemedicine allowed the maintenance of the metabolic control.
New Records of Desmids from Blanket Bogs in Turkey
Authors: Akar Bülent , Avci Utku
Published: February 2023

Peatlands are one of the globally important ecosystems. Blanket bogs are a type of peatlands where water is generally supplied by meteorological events (rain, snow). We have been conducting the first detailed algal flora study of blanket bogs of Turkey and found new records of algae genera ever given for Turkey. Here, we report a total of four desmids genera identified as new records for freshwater algal flora of Turkey: Spirotaenia (Spirotaenia condensata, Spirotaenia erythrocephala), Mesotaenium (Mesotaenium macrococcum), Hyalotheca (Hyalotheca dissiliens), and Bambusina (Bambusina borreri). Their ecological habitat is also discussed to highlight the importance of protection and sustainability of these unique areas.
Status of Conservation of the Mangrove of Playa Blanca, Holguin (Cuba)
Authors: Pozo-Serrano Jonathan , de la Cruz Enrique Reynaldo , Hernández-Marrero David F. , Guzmán-Alberteris Lisbet
Published: February 2023

This study determined the state of conservation and association of abiotic variables in the mangrove forest of Playa Blanca, Holguin, Cuba. Three randomly located transects were made, each of 100 m2 (10 x 10 m). A stress level (0.06) was obtained, allowing to establish a good level of adjustment in the distribution of the ecological distances of both species in relation to the previously established chemical-physical parameters. A poor state of conservation of the Playa Blanca mangrove forest is confirmed, and a strong association between temperature and the total height of the trunk of both mangrove species present.
Unwanted Guest Continues its Northern Journey in the Aegean Sea: Pterois miles (Bennett, 1828)
Authors: Aydin İlker , Ağdamar Sevan , Yapici Sercan
Published: February 2023

Pterois miles (Bennett, 1828), one of the most destructive marine invaders, was reported from the Mediterranean in 1991. It has invaded most parts of the Mediterranean from 2013, when it was reported for the second time, until today. On 7th October 2020, a single specimen of P. miles was collected by the bottom trawl from the Edremit Bay (Northern Aegean Sea). COI barcode region was used for the molecular identification of the specimen. DNA barcode data suggest that the specimen used in the present study is P. miles with a 99.69% probability. The current study is presented by providing the northernmost occurrence of the P. miles from the Aegean Sea with molecular confirmation.
Anomalies and malformations of visceral arteries in children with extrahepatic portal vein obstruction
Authors: Yuldashev R. Z. , Aliev M. M. , Maksudov M. M. , Khaydarov U. O.
Published: February 2023

Purpose. To study the incidence of anomalies and malformations of visceral arteries and evaluate their role in the treatment of extrahepatic portal vein obstruction (EHPVO) in childrenMaterial and Methods. The study included 155 previously not operated children with EHPVO. A retrospective analysis of the results of three-phase multislice computed tomography with angiography (MSCTA) of visceral vessels was performed. Frequency of visceral arteries anomalies of the abdominal aorta, aortomesenteric angle, the structure of the hepatic, splenic and superior mesenteric arteries (SMA) were assessed. The size of visceral arteries depending on the prevalence of portal vein thrombosis was also assessed.Results. According to analysis 35 (22.6%) children with EHPVO had abnormalities of visceral arteries. Of them, 14 (11.7%) patients presented with signs of aortomesenteric compression of the left renal vein (LRV). Coeliacomesenteric trunk was detected in 4 (2.5%) children. In one (0.64%) case there was sign of saccular splenic artery (SA) aneurysm. According to data, there was a significant correlation of the diameter of SA and SMA with the age of children (r = 0.58; p = 0.001). According to the study, diameter of arteria hepatica propria in children with portal vein thrombosis (PVT) with extension into superior mesenteric vein (SMV) was significantly lower than in PVT and its branches (2.48 ± 0.23 mm vs 3.15 ± 0.08 mm, p = 0.01). The diameter of SA in children with PVT extended into splenic vein was significantly smaller (4.26 ± 0.19 mm) in comparison to children with PVT and its branches (4.9 ± 0.12 mm, p = 0.01), and children with widespread thrombosis of portal vein system (5.45 ± 0.41 mm, p = 0.05).Conclusion. Multiple aberrations of the anatomical structures of visceral arteries make any hepatobiliary surgery challenging to surgeons. The study data suggest that MSCTA is an informative method for evaluation of associated anomalies of visceral arteries in children with EHPH.
Transfer Learning for automated search for defects on chest X-rays
Authors: Borisov A. A. , Semenov S. S. , Arzamasov K. M.
Published: February 2023

Purpose. To develop and test algorithms for determining the projection and searching for common technical defects on chest -rays using transfer learning with various neural network architectures.Materials and methods. Algorithms have been created to search for technical remarks such as incorrect choice of study boundaries and errors of patient positioning. Transfer learning of neural network architectures VGG19 and ResNet152V2 was chosen as the basis for creating algorithms. To train and test the algorithms, we used radiographs from open databases (over 230,000 studies in total). To validate the obtained algorithms, a test dataset was prepared from 150 anonymized chest x-rays unloaded from the Unified Radiological Information Service of the Moscow city (URIS) and evaluated by expert doctors and technicians.Results. All obtained algorithms have high classification quality indicators. The maximum accuracy on the test dataset was obtained for the model that determines the projection, AUC was 1.0, the minimum accuracy: AUC 0.968 was obtained for the model that determines the rotation of the chest on the lateral X-ray. On the validation dataset maximum accuracy was obtained for the model that determines the projection, AUC was 0.996, the minimum accuracy: AUC 0.898 was obtained for the model that determines the rotation of the chest on the lateral x-ray.Conclusions. All of diagnostic accuracy metrics for each of the models exceeded the threshold value of 0.81 and can be recommended for practical use.
Non-invasive measurement of oxygen metabolism. Part 1: Historical review and state of the art
Authors: Postnov A. A. , Kalaeva D. B. , Balakhonov A. B. , Pronin I. N.
Published: February 2023

Oxygen metabolism is a key factor in the life of a living organism. The article is the first part of a review of methods for measuring oxygen metabolism.

Purpose. The aim of this review is to present an insight into the evolution of methods for measuring oxygen metabolism in a way from global to local measurement of brain perfusion. The role of the 15O isotope as the “gold standard” for measuring oxygen metabolism using positron emission tomography (PET) is described. We also provide a case report of brain tumor perfusion measurements from our clinic.

Materials and methods. More than 200 Pubmed publications were studied with the keywords “positron emission tomography + O-15”. Relevant publications that do not contain these keywords or contain them in a different wording were also analyzed. A clinical case of a brain tumor perfusion using CT perfusion, MR-ASL and PET with H215O is provided.

Results. The evolution of methods for measuring perfusion, oxygen extraction, and oxygen metabolism, is described. More than 50 papers are cited depicting key advances in measurement technologies. Examples of the use of PET with H215O in fundamental research and clinical practice are given.

Conclusion. The obvious value of oxygen-isotope PET data is combined with the invasiveness (in some cases), technical complexity and high cost of the procedure. The second part of the review will be devoted to alternative methods for measuring oxygen metabolism, which are developing in the 21st century and which are intended for wide clinical use.
Unexpected Landscapes. Wastelands as ‘buffer zones’ for the future
Authors: ZANOTTO FRANCESCA
Published: February 2023

Mining operations at Bingham Canyon Mine, Utah, 2009 by Arbyreed. License: CC BY-NC-SA 2.0
 
Land worldwide is deeply marked by human activity, which became heavier, harder, more wasteful, and permanent after the industrial revolution. The landscapes of the Anthropocene encompass riddled proving ground and test sites, nuclear wastelands, immense open-pit mines, contaminated lands, disappearing bodies of water, boundless landfills, and discarded territories. These grounds are the landscapes of growth, production, and destruction: the sceneries where the show of quarrying, discharge, stockpile, abandonment, drainage, and burial is staged. However, this rush to exhaustion is giving shape to the landscape of tomorrow: the examination of unforeseen uses and values attributed in the current age to some of these ‘sceneries of consumption’ – the Bingham Canyon Mine near Salt Lake City; the former Fresh Kills landfill in New York; the decommissioned Templehof Airport in Berlin– suggest they may play unpredictable cultural and strategic roles in the next future.
Analisis Availability Metrics Webserver Penyedia Website Program Studi Teknik Elektro Fakultas Teknik Universitas Udayana
Authors: Pratama Dwi Yoga , Sukadarmika Gede , Putra Sastra Nyoman
Published: February 2023

This research aims to observe and find out the availability value of the system that provides website access of the Electrical Engineering Study Program at the Faculty of Engineering, Udayana University. To find the availability values, data collection was carried out on each network devices by using a network monitoring program called CACTI based on Simple Network Management Protocol. The data were in the form of PING Latency from each network devices consisting of one server, two switches, and two routers. From the PING Latency data, then the value of Mean Time to Failure and Mean Time to Recover can be calculated which is used to determine the availability value of the network device. After all network devices had the availability values, then a calculation was made to determine the availability value of the entire website service provider system of the Electrical Engineering Study Program, Faculty of Engineering, Udayana University which from the result of this research found that Electrical Enginering’s Website has availability values of 99.9%.
ANALISIS GANGGUAN HUBUNG SINGKAT SIMETRIS DAN ASIMETRIS UNTUK MENENTUKAN KAPASITAS PENGAMAN YANG TERPASANG PADA JARINGAN DISTRIBUSI 20 kV PENYULANG MAMBAL
Authors: Paramadita I Kadek Purniawan , Satriya Utama Ngakan Putu , Arta Wijaya I Wayan
Published: February 2023

Gangguan hubungasingkat tenaga listrik ditimbulkan oleh hubung singkat tigaafaseasimetris, gangguan hubung singkat tidak simetris satu fase ke tanah dan gangguan hubung singkat tidak simetris antar fasa dan dua fasa ke tanah. Gangguan tersebut telah menyebabkan beberapa trip, kegagalan kerja relay dan recloser. untuk menentukan setting waktu kerja relay arus lebih dan recloser agar peralatan proteksi dapat bekerja dengan baik dilakukan simulasi gangguan hubung singkat pada beberapa titik lokasi gangguan yang dipilih berdasarkan kondisi di jaringan penyulang Mambal. Berdasarkan analisis, arus gangguan hubung singkat dipengaruhi oleh jarak tittik gangguan, semakin dekat titik gangguan dengan sumber maka semakin besar arus gangguan hubung singkat pada titik tersebut. Arus gangguan maksimum dan minimum hubung singkat mengakibatkan selisih waktu kerja relay di tiap lokasi dengan selisih waktu TMS selama 0,4 detik. Dilakukannya setting sistem proteksi pada penyulang Mambal sesuai dengan hasil analisis dapat memperbaiki selektifitas sistem proteksi pada Penyulang Mambal.
Penerapan Algoritma K-Means Clustering dalam Penentuan Nilai Huruf pada Permainan Susun Kata Bahasa Bali
Authors: Rian Yuliawan I Made , Care Khrisne Duman , Arya Mertasana Putu
Published: February 2023

Word stacking is a very popular game in the world. In general word stacking games are called Scrabble games. Word stacking games are educational games that prioritize vocabulary. There are several important aspects in word stacking games, including the configuration of the reference word and the value of letters. However, until now, there are no word stacking games with game configurations that use Balinese as a language reference. The purpose of this study is to design a word stacking game in Balinese as a language reference and determine the value of each letter used in the word. In its design, the word used is sourced from the Second Edition of the Balinese Dictionary which consists of 10441 words. All the words will be grouped by the value using the K-Means Clustering method. Before all the words grouped with K-Means Clustering the words will be determined the frequency of occurrence of each letter in the word, appearance at the beginning and end of the word, and the frequency of the use of letters as a prefix and suffix. The results obtained from grouping with K-Means Clustering are letters A having the smallest value, namely 1 point and letters C, J, W, and Y have the largest value, 10 points.
UNJUK KERJA PEMBANGKIT LISTRIK TENAGA SURYA ROOFTOP 158 KWP PADA KANTOR GUBERNUR BALI
Authors: Wicaksana M.R. , Kumara I.N.S. , Giriantari I.A.D
Published: February 2023

The Provincial Government of Bali is collaborating with the Ministry of Energy and Mineral Resources for the developing a 158 kWp rooftop solar power plant that connected to the grid of PLN. The energy produced so far has reduced the supply of electricity from PLN in the Bali Governor's Office area. The purpose of research studies is know the potential energy produced by solar power plant 158 kWp. Energy production is estimated using HelioScope simulation. Data needed includes location of the solar power plant, and solar power plant technical specifications. The simulation produces total energy data in a year of 249,764 kWh/year with the highest energy occurring in May of 24,172 kWh and the lowest energy occurring in January of 16,226 kWh.
OPTIMASI PENEMPATAN DAN KAPASITAS DISTRIBUTED GENERATION (DG) UNTUK MEMINIMALKAN RUGI-RUGI DAYA PADA PENYULANG ABANG MENGGUNAKAN METODE QUANTUM GENETIC ALGORITHM (QGA)
Authors: Adhi Waskita I Gusti Agung , Ibi Weking Antonius , Setiawan Widyadi
Published: February 2023

This research was conducted to obtain the optimal DG location with the aim of minimizing power losses in feeders. Penyulang Abang has a length of 207,946 kms with power losses of 1,105 MW. One way to reduce power losses is to install distributed generation. Distributed generation is installed in four Abang feeder locations. Optimization is done by using the Quantum Genetic Algorithm (QGA) method. Quantum Genetic Algorithm is an evolutionary algorithm. Genetic Quantum Method Algorithms are based on the concept of quantum bits (qubit) and the superposition of quantum mechanical forms. The purpose of this method is to select the best results from the results obtained. The final result of the QGA method is the most efficient distributed generation and capacity placed in several Abang feeder locations, namely buses 1, 5, 7 and 302 with capacities of 0.374 MW, 1,894 MW, 1,988 MW and 0.500 MW, respectively. So that the power losses are reduced to 0.234 MW.
Pengaruh Fuzzy Logic Controller Pada Pengoperasian Filter Aktif Shunt Terhadap Penurunan ITHD dan Rugi-Rugi Daya Pada Sistem Kelistrikan RSUD Klungkung
Authors: Jerry Akira Dinata I Putu , Rinas I Wayan , Arta Wijaya I Wayan
Published: February 2023

RSUD Klungkung is supplied by a transformer with a capacity of 200 kVA. The use of non-linear loads in Klungkung Hospital can cause harmonic currents (ITHD). The greater the harmonic current produced, the quality of the electrical power will get worse, causing losses to the transformer. The installation of active shunt filters and the use of fuzzy logic controllers as controllers on filters can reduce the harmonics that occur in the electrical system. The results of ITHD measurements on existing conditions for R phase are 11.23%, S phase is 14.72%, and T phase is 11.20%. The ITHD value decreased when the system was paired with a shunt active filter for R phase of 5.24%, S phase was 7.18%, and T phase was 5.34%. The ITHD value has decreased again when the use of fuzzy logic controller for R phase is 0.15%, S phase is 0.17%, and T phase is 0.11%. Decreasing ITHD values affect the losses generated on the system. In the existing conditions losses are 10.525%, losses in the operation of the shunt active filter are 1.352%, and the use of fuzzy logic controller produces the smallest losses of 0.00035%.
Peningkatan Kapasitas Rentang Tegangan Uji Osiloskop Tipe Hm 203-7 dengan Pemanfaatan Alat Konverter
Authors: Lastera I Wayan
Published: February 2023

Testing voltage regulation in power electronic practice, voltage capacity observed above 60 volt. The limited range capacity test voltage oscilloscope HM 203-7 type, testing can not be done properly. One of the approach that can be done to increase range capacity test voltage oscilloscope is use converter device. This study aim to know potency utilization of converter device on oscilloscope HM 203-7 type. The study was carried out by installing the converter device in the oscilloscope probe, the test voltage capacity being increased gradually. The results showed, converter device was able to increase range capacity test voltage oscilloscope HM 203-7 type to 240 Volt test voltage.
Potensi Pembangkit Listrik Tenaga Surya Atap Gedung Sekolah di Kota Denpasar
Authors: Kristiawan H. , Kumara I.N.S. , Giriantari I.A.D.
Published: February 2023

Solar Power Generation System (PLTS) is a power generation system that utilizes sunlight as a renewable energy source and a rooftop as a place for solar panels. This paper presents the results of a study of the potential of a rooftop-based solar power plant in the city of Denpasar by taking a location on the roof of the SD Negeri 5 Pedungan Diponegoro No. 60 Denpasar road using PLTS objects that have been installed. The study was carried out with the help of Heliospoce software. Based on the study, information was obtained that the potential of solar energy was 1912.8 kWh / m2 / year or an average of 5.2 kWh / m2 / day in the city of Denpasar. Sunlight that can produce electricity starts at 07.00 -18.30 WITA. The installed energy potential of PLTS is 3214.6 kWh with an angle corresponding to the roof angle of 30.96o. The result of the potential energy produced will be greater if the installation of PV uses the optimal angle (15o) that is equal to 3407kWh.
STUDI PROTEKSI DOUBLE BUSBAR AKIBAT PENAMBAHAN TRANSFORMATOR DI GARDU INDUK PEMECUTAN KELOD
Authors: Rogan Bayu Candra Dwipa I Kadek , Dyana Arjana I Gede , Indra Partha Cok Gede
Published: February 2023

Pemecutan Kelod Substation operated with four conductors, three transformers, one capacitor and one coupling with double busbar configuration, side by side with the Kapal and Pesanggaran substation to maintain electricity supply in Kuta, Legian, Seminyak, Denpasar City and surrounding areas. Due to increase in load in Denpasar area, PT PLN (Persero) Trans-JBJT added one transformer to improve the reliability of electricity in this substation, so Pemecutan Kelod substation operated with four transformers. To optimize the continuity of the power flow, it is necessary to analyse the relay settings on the busbar current and the appropriate protection settings as a protection system reference. In this study, the calculation of resistor stability (Rstab) of input current and output current after and before the addition of the transformer is carried out. The results of the calculation of resistor stability (Rstab) before the addition of the transformer is obtained with a total of 5.12 ?, the input current is 1030 A and the output current is 1010 A with losses of 1.9%. While the results of the calculation of resistor stability (Rstab) after the addition of the transformer is obtained with a total of 5.64 ?, the input current is 1070 A and the output current is 1060 A with losses of 0.9%. Those losses values complied with the SPLN No.1: 1987 standard for the 150 kV system.
DESAIN INSTALASI LISTRIK UNTUK PERLUASAN FAKULTAS TEKNIK UNIVERSITAS UDAYANA KAMPUS SUDIRMAN
Authors: Paramarta Dwi Parna Kadek , Sari Hartati Rukmi , Janardana I Gusti Ngurah
Published: February 2023

Tujuan dari penelitian ini adalah merencanakan sistem kelistrikan untuk penyediaan daya di gedung AF Program Studi Teknik Elektro Fakultas Teknik Universitas Udayana Kampus Sudirman serta lift yang akan dipasang di gedung C. Berdasarkan hasil perhitungan, diperoleh jumlah titik lampu sebanyak 163 titik, kotak kontak 165 titik, AC sebanyak 52 buah, beban total untuk gedung AF sebesar 82.410,11 VA ditambah dengan beban lift sebesar 12.000 VA sehingga beban total menjadi 94.410,11 VA dengan diversity factor 65%, total daya yang dibutuhkan adalah 61.366,5715 VA. Untuk sistem pembumian, jika menggunakan sistem pembumian elektroda batang bertipe 1 rod dengan kedalaman 14 meter mengunakan pembumian bertipe 2 rod S < L dengan kedalaman masing-masing rod 8 meter dan 2 rod S > L dengan kedalaman masing-masing rod 6 meter. Jika menggunakan sistem pembumian bertipe pelat dibutuhkan 2 buah pelat. Perencanaan lift yang direkomendasikan dengan kapasitas 1050 Kg dengan daya sebesar 14,0 kW.
STUDI PERBAIKAN SISTEM PEMBUMIAN UNTUK MENCEGAH KEGAGALAN LIGHTNING ARRESTER PADA PENYULANG SULAHAN BANGLI
Authors: Julyantara I Nyoman , Janardana I Gusti Ngurah , Dyana Arjana I Gede
Published: February 2023

The Feeder of Sulahan Bangli is located in the highlands which are often exposed to natural phenomena in the form of lightning, so the Feeder of Sulahan Bangli often experience interference with over voltage. Lightning Arrester in The Feeder of Sulahan Bangli often experience failure due to overvoltages during lightning surges. In 2016 there were 4 times the overvoltage failure in conventional Lightning Arrester in The Feeder of Sulahan (PT. PLN (Pesero) UP3 East Bali, 2016). The failure of Lightning Arrester in The Feeder of Sulahan Bangli is caused by the interference of backback-flashover, this is caused by the earth resistance value in Lightning Arrester exceeds the standard value <1 ? which is an average of 8 ? so that it needs to be repaired grounding system. In this study an analysis of the area of the grounding system is installed, analyzing the various grounding systems that are suitable in the Feeder of Sulahan, and calculating the cost of each grounding system. The results of calculations and analysis of several grounding systems used by the Grid-Rod grounding system in wet and clay soils are the most optimal type of groundinging system that can be used as a reference for improving the grounding system in The Feeder of Sulahan Bangli with an earth resistance value of 0, 4543 Ohms at a cost of Rp. 5,416,625, - per unit and on a 0.4461 Ohm thick clay soil at a cost of Rp. 8,728,125, - per unit.
RANCANG BANGUN SISTEM MONITORING LAMPU PENERANGAN JALAN UMUM BERBASIS WEB
Authors: Vendi Arya Wibawa Putu , Oka Saputra Komang , Amrita Anak Agung Ngurah
Published: February 2023

Beberapa masalah yang terjadi pada lampu penerangan jalan umum kadang kala terabaikan, karena tidak ada laporan atau pengecekan yang rutin dilakukan, hal ini bisa sangat membahayakan pengguna jalan umum terutama pada malam hari. Dalam penelitian ini dibuatkan rancangan sistem monitoring lampu penerangan jalan umum berbasis web. Perancangan sistem monitoring dibagi menjadi dua metode yaitu perancangan perangkat keras dan perancangan web. Untuk perangkat keras ditambahkan modul Wifi ESP8266 sebagai media pengiriman data ke web, perancangan web yang digunakan yaitu memanfaatkan Sistem Informasi Geografis (SIG) untuk mengetahui lokasi LPJU. Pada SIG ada mark yang berisi informasi tentang lokasi alat monitoring dan informasi tentang data nilai-nilai pada sensor. Apabila terjadi gangguan pada lampu penerangan jalan umum seperti lampu mati dan kabel terputus, akan ada penurunan nilai pada sensor, jika nilai sensor yang dibaca di bawah dari yang sudah di tentukan maka mark yang ada pada map web monitoring akan berganti, menandakan terjadinya gangguan pada lampu penerangan jalan umum.
SISTEM INFORMASI KENAIKAN PANGKAT PEGAWAI DI LINGKUNGAN PEGAWAI NEGERI SIPIL KOTA DENPASAR
Authors: Raka Novi Aristi A.A , Sudarma Made , Arsa Suyadnya I Made
Published: February 2023

BKD Denpasar has an employee management information system. The system is useful for managing employees from managing new employees to managing retired employees. The current problem is the system cannot manage staff promotions. The current system is that employees submit promotions by filling in the files manually. The solution proposed in this problem is a promotion information system with existing data and managed using an existing staffing system. The system is designed using a data flow diagram while the database is designed using an entity relationship diagram. Web-based system is built using the PHP programming language. The database is implemented using MySQL. Based on the results of application testing with Black-box testing, all the functionality of the Information system of promotion in the Civil Service Environment Denpasar that has been built can run well. The resulting system can help the performance of administrative officers for promotion. The system built can run well according to user needs.
PERENCANAAN SISTEM PEMBUMIAN GRID-ROD PADA GARDU INDUK 150 KV NEW SANUR
Authors: Rian Sanjaya Dewa Made , Indra Partha Cok Gede , Dyana Arjana I Gede
Published: February 2023

At the substation there are several electrical equipment including power transformers, power breakers, phase change devices, and protective equipment, to keep all equipment in the substation a grounding system is needed. To obtain a good earth system in the planning of the substation must pay attention to the type of soil. In this study there are several methods of earthing system analyzed, including: plate earthing system, mesh earthing system and grid-rod earthing system. This analysis aims to obtain a good earthing system design with a low earth resistance value. From the results of analysis and calculation of the earth grounding system, the earth resistance value is obtained using 34 plates of 0.3555 Ohm. The Earth Mesh system obtained the value of the ground resistance of 0.3447 Ohm with a distance of D is 10 meters then for the planning of the ground-up systems construction of the New Sanur subsite that will be used as a reference is a grid-rod ground system, with The length of the grid is 100 meters, and the width of the grid is 60 meters, then the optimization design obtained from the results of analysis and calculation is 0,3324 useing the distance between the conductor of the grid is 10 meters and the number of rod is 32 Rod.
OPTIMASI UNIT PLTU BERBAHAN BAKAR BATUBARA MENGGUNAKAN METODE LAGRANGE DI PT. INDONESIA POWER UP SURALAYA
Authors: Murti A.S. , Manuaba I.B.G. , Arjana I.G.D
Published: February 2023

The magnitude of the need for a load, the characteristics of a plant, the max and min limits of generating capacity, as well as the expenditure for fuel for each generating unit economically influences the operation of the plant. The purpose of this research is to obtain the minimum generation cost in a certain loading conditions on the power system by the Lagrange multiplier. Loading data used are data on May 14, 2018 at 07.00 WIB.The final results show that, with a total generation of 2644 MW, the costs must be incurred in the amount of Rp1,180,776,616.22 while the lagrange method used to optimize the plant, the cost of generation is Rp1,160,220,968.97. The amount of savings that can be done for one hour is 07.00 WIB which is Rp. 20,555,647.26. From the studies that have been carried out it can be concluded that the Lagrange method is able to produce a minimum generation cost which is quite good compared to the cost of real generation.
PERAMALAN BEBAN LISTRIK JANGKA PENDEK MENGGUNAKAN METODE ADAPTIVE NEURO FUZZY INFERENCE SYSTEM (ANFIS) DI GARDU INDUK NUSA DUA BALI
Authors: Satriawan I Made , Mataram I Made , Amrita A. A. Ngurah
Published: February 2023

Electric load in Nusa Dua Bali has increased from 2013-2017 by an average of 11.83%. The increase in electric load requires the electrical energy service provider to be able to adjust the electricity demand and be able to increase its reliability, The effort that can be done is to predict the electric load. Electric load forecasting can be done by various methods, ANFISo (Adaptiveo Neuroo Fuzzyo Inferenceo Systemo) is one method that is often used in forecasting electrical loads. ANFIS is able to explain the reasoning process and do data learning. The data used are the electric load, temperature, humidity and time, the data was chosen because changes in temperature and humidity affect people's habitual patterns in using air conditioners (electric load patterns). The electric load pattern is trained 100 times using ANFIS with the type of membership function is trimf, and [3 3 3 3] is the number of membership function. The indicator to determining the accuracy of the electrical load forecasting pattern results with the real electric load pattern used the MAPE (Mean Absolute Percentage Error) value, which the MAPE standard value that good is less than 10%. The test results from this study produced a MAPE value of 6.98%.
PENGGUNAAN KAPASITOR BANK UNTUK MEMPERBAIKI FAKTOR DAYA DAN MENGURANGI RUGI-RUGI DAYA MENGGUNAKAN FUZZY LOGIC CONTROLLER DI QUEST HOTEL KUTA BADUNG
Authors: Wiadnya Wiantara I Dewa Gede , Mataram I Made , Manuaba Ida Bagus Gd.
Published: February 2023

Quest Hotel Kuta is a place of business engaged in lodging services. To support operationalneeds, the hotel uses electrical equipment, most of which are inductive. The use of high inductiveloads can produce high reactive power, depending on the power factor because the active powerobtained from the installed power will be less. Based on the measurement results at Quest Hotel Kutathe measured power factor is 0.70, while PLN charges the excess cost of kVARH to the customer ifthe average power factor is less than 0.85. To be able to improve the low power factor can be done byusing a capacitor bank, the capacitor uses the reactive power required at the inductive load. Changingthe power factor in consumers can change. To equalize the power change factor, the capacitor bank isassembled to work multiple steps / multi steps. Multi-step capacitor banks consist of several capacitorswith the same or different capacities. Based on the results of measurements before using the fuzzylogic method, the obtained power factor is 0.70 to 0.74 while the capacitors are installed from 12.5kVAR to 25 kVAR. After using the fuzzy logic controller method the power factor obtained is 0.80 to0.87 and capacitors using the 13.1 kVAR to 22.4 kVAR method. Whereas the power losses beforeusing the fuzzy logic controller method are 26220.5 watts. After using the fuzzy logic controllermethod, the power losses incurred were 23214.45 watts.
ANALISIS KETIDAKSEIMBANGAN BEBAN DAN HARMONISA PADA TRANSFORMATOR DISTRIBUSI MI 0096 PENYULANG ABIANBASE
Authors: Yoga Prasetya I Wayan , Setiawan I Nyoman , Dyana Arjana I Gede
Published: February 2023

MI 0096 Distribution Transformer is one of the transformers supplied by Abianbase Feeders.The MI 0096 distribution transformer has a capacity of 100 kVA with a daytime load of 48,5 kVA and a nighttime load of 50,81 kVA. Unequal single-load loads on the transformer result in unbalanced loads on the transformer MI 0096 and the use of non-linear loads results in harmonic distortion on the transformer MI 0096. In this study, carried out a comparison of load imbalance and harmonics that occur during the day and night.The results of the analysis found that the percentage of load imbalance in the MI 0096Distribution Transformer is classified in poor condition that exceeds 25% with the percentage of load imbalances during the daytime at 28,74% and at noon 30,28%. THDv on the MI 0096 Transformer is within the allowable limit of below 5% with THDv at 1,7% during the day and 1,9% at night. THDi in the MI 0096 Distribution Transformer exceeds the allowable standard which exceeds 8%, with THDi during the day 17,5% and at night 24%. Losses caused by the THDi in the MI 0096 transformer have increased along with the increase in THDi in the transformer. Losses without THDi are 0,5 kW, whiletotal losses after being affected by THDi are 5,79 kW during the day and 11,01 kW at night.
PERANCANGAN SISTEM PEMANAS AIR MENGGUNAKAN SISTEM KENDALI PID
Authors: Parmadi Putra I.W. , Arta Wijaya I. W. , Budiastra I.N.
Published: February 2023

As the technology advances in control system grow rapidly, especially those involved with water temperature, there is anincreased demand for a control system that is able to provide precisely stable temperature value. The commonly used systemsnowadays are still using the ON/OFF control system for it is relatively affordable and simple, but unfortunately numerouserrors are still found and it is not yet able to provide precise data. Therefore, a PID control system was developed to addressthis issue. In this study, Arduino UNO temperature control was used as data acquisition system, and LM35 temperature sensorwas used to detect the temperature recognized by signal conditioning. From the signal conditioning, the driver will then controlthe heater in order to obtain a precise temperature. This PID system utilized a water-resistant temperature sensor. In this study, the heater was treated by means of controlling the PID temperature which ranged from 69oC to 70.5oC. Another test was doneby comparing the temperature value detected by the device’s temperature sensor with an external digital thermometer whichwas placed in the same container. The temperature value detected by the device’s temperature sensor had a difference of ±1,300C compared to the digital thermometer.
OPTIMASI PERENCANAAN SISTEM PEMBUMIAN PADA RENCANA PEMBANGUNAN GAS INSULATED SUBSTATION 150 KV PECATU
Authors: Quentin MP Putu , Indra Partha Cok Gede , Janardana IGN
Published: February 2023

The construction of the Gas Insulated Substation (GIS) 150 kV Pecatu is planned by PT. PLN(Persero) to get electricity needs in the area of Pecatu, Badung Regency, Bali Province. The GasInsulated Substation (GIS) 150 kV Pecatu is located in a hilly area with a texture of limestone rockysoil and the resulting soil type resistance is ? = 263.76 ohm-meter. The results of calculations for thetype of earthing system Plates earth resistance value of 0.95 ohms at a cost of Rp. 4,196,000,000, -(Four Billion One Hundred Ninety Six Million Rupiah), for the type of Mesh earthing system no resultsare obtained <1 ohm and for the Multi Grid-Rod earthing system type the grounding resistance valueis 0.876 ohms at a cost of Rp 3,753,120,000, - (Three Billion Seven Hundred Fifty Three Million OneHundred Twenty Thousand Rupiah). The type of earthing system recommended is a Multi Grid-Rodearthing system with a distance between parallel conductors (D) of 1 meter, depth of conductorplanting as deep as 4 meters above the ground surface, Rod electrode diameter of 0.015 meters, Rodelectrode length of 4 meters and total conductor length of 12500 meters.
RANCANG BANGUN PELUNCUR ELEKTROMAGNETIK DENGAN SUPLAI KAPASITOR
Authors: Adi Guna Subawa I Nyoman , Prapto Sudarmojo Yanu , Arta Wijaya I Wayan
Published: February 2023

Electromagnetic launchers are devices that use electromagnetic forces to launch high-speed projectiles, utilizing accelerated armature shifts along with a pair of conductive rails. Electromagnetic launchers have been studied as high-speed ballistic launchers for various applications such as military weapons to space launches. Based on the development of capacitor technology and the limited development of electromagnetic launchers, especially in the field of launching high-speed projectiles with capacitor supply as the development of electromagnetic weapons technology, research was carried out by making the design of electromagnetic launchers with capacitor supply to produce high-speed projectiles (more than 180m/s based on variations in rifle bullet speed) as the development of electromagnetic weapons technology. The results of the research on the design of electromagnetic launchers with capacitor supply obtained the final projectile velocity value of 200,644 m/s, which consists of three main components namely the rail system, the gas injector, and the supply system.
RENCANA PEMASANGAN DISTRIBUTED GENERATION PADA JARINGAN DISTRIBUSI SERTA PENGARUHNYA TERHADAP PROFIL TEGANGAN DAN RUGI-RUGI DAYA
Authors: Artawan A. A. T. B. , Sukerayasa I W. , Ariastina W. G.
Published: February 2023

Jatiluwih feeder is a primary 20 kV distribution network with a peak demand of 1.85 MW. The feeder has a radial configuration with a length of 120 kmc. The extended length of the feeder causes a high voltage drop and power loss. One strategy to reduce voltage drop and power loss is by the installation of distributed generation (DG). The energy resource of the DG usually adopts local available renewable energy resources, such as solar power and hydro power. This paper discusses voltage profile and power loss due to the installation of DG on the distribution network. The analysis covered survey of the available renewable energy resources and power flow simulation. Power flow simulation was carried out in two scenarios, before and after the installation of DG. The simulation results showed that during peak daytime load, DG installation is able to reduce maximum voltage drop by 2,08 %, and increases the voltage from 344,4 V to 352,7 V. Besides that, the installation of DG is able to reduce the total power loss by 9,43 % or as much as 530 kW.
ANALISIS PENGARUH NILAI TAHANAN PEMBUMIAN TITIK NETRAL TRANSFORMATOR TERHADAP PERUBAHAN THD ARUS DAN RUGI-RUGI DAYA DI RSUD KLUNGKUNG
Authors: Satcitananda P I G.B. , Rinas I W. , Janardana I G.N.
Published: February 2023

Harmonics causes an increase in the current flowing in the neutral wire due to the use of unbalanced non-linear loads. THDisimulation was conducted in this study using MATLAB Simulink software and calculating power losses. Based on themeasurement results it is known that THDi transformer one exceeds the standards set by IEEE 519-2014. THDi simulationresults in the existing conditions show the percentage of phase R of 17.27%, S phase of 16.40%, phase T of 16.24% with acurrent flowing on a neutral wire of 19.64 A. Based on the results of simulations with earth resistance 11? shows thepercentage of THDi in the R phase 15.69%, S phase 14.70%, T phase 9.83% and the current flowing on the neutral wire is1.013 A. When the earth resistance is changed to 8? THDi in the R phase by 15.62%, the phase S 14.67%, T phase 9.81% withcurrent flowing on neutral wire 1,297 A. While the earth resistance is reduced to 4? THIn the R phase 13.57%, S phase 14.51%,T phase 9.80% and the current flowing on the neutral wire is 2,518 A. The power losses in the one-time transformer when theexisting conditions are 8,796 kW, while the earth resistance 11? is 6,079 kW, while the ground resistance 8? is 6,032 kW, andwhen 4? is 5,880 kW.