bluuebunny/crossref_metadata_2025 huggingface dataset:
Peran Social Brand Engagement Dan Product Quality Terhadap Peningkatan Brand Awareness, Brand Association, dan Purchase Intention
Authors: Rachmanu Edvian Ditya , Purnomo Fajrin , Hartini Sri
Published: May 2024

Social brand engagement is important in the context of the current digital era because interactions between brands and consumers not only occur conventionally, but also involve social media which is the center of public attention. Social media is an interactive platform for customers to interact and engage with other people and brands during various stages of the process. This research aims to examine the influence of Social Brand Engagement and Product Quality on Brand Awareness, Brand Association and Purchase Intention. The research used quantitative methods, primary data was obtained from 116 respondents who are members of the Basketball Lovers Community on Twitter (aged 18–40 years) using Partial Least Square (PLS) as a data analysis technique. The results of this research indicate that Brand Association and Brand Awareness do not have a significant influence on Purchase Intention. On the other hand, it was found that Product Quality has a significant influence on Purchase Intention. Apart from that, the research results also show that Product Quality has a significant positive influence on Social Brand Engagement. Apart from that, Social Brand Engagement also plays an important role by significantly influencing Brand Association and Brand Awareness. This research provides an in-depth understanding of the factors that influence Purchase Intention, emphasizing the important role of Product Quality in shaping consumer preferences, as well as the positive contribution of social interactions in building associations and Brand Awareness.
Pengaruh Work Environment dan Perceived Organizational Support terhadap Employee Engagement pada Karyawan Kantor POS Kabupaten Tuban
Authors: Meidytania Vinolia Putri , Frianto Agus
Published: May 2024

This study investigated the impact of work environment and perceived organizational support on employee engagement. The data was analyzed with a Multiple Linear Regression technique using SPSS 25 Version.The sample came from employee of the expedition company in Tuban with total 40 respondent using the saturated sample technique. Statistical result showed that work environment giving the positive significant effect on employee engagement. A good work environment can make employee more comfortable thenit can increases engagement of the employee. In the same way, perceived organizational support also giving a positive impact significantly on employee engagement. Good support from the company can trigger employee enthusiasm in increasing engagement of the employee. In addition, the test results demonstrated that employee engagement is positive and significantly impacted by work environment and perceived organizational support. Based on the research results, companies need to further maximize the quality of the work environment both physically and socially and maximize support such as being more responsive to complaints, reinforcing regulations that can equalize the treatment of each employee which will be able to increase employee engagement.
Pengaruh Work Motivation dan Digital Culture terhadap Work Productivity melalui Work Engagement pada Karyawan PT. Pegadaian
Authors: Hidayah Fitriana Nurochmatul , Wardoyo Dewie Tri Wijayati
Published: May 2024

Penelitian ini bertujuan untuk mengukur dan menganalisis pengaruh motivasi kerja dan budaya digital terhadap produktivitas kerja melalui work engagement pada karyawan PT. Pegadaian. Penelitian ini merupakan penelitian kausal yang menggunakan pendekatan kuantitatif, dengan populasi terdiri dari 64 karyawan dan sampel sebanyak 55 karyawan. Analisis data dalam penelitian ini menggunakan SEM-PLS dengan kontribusi software SmartPLS 4.0. Hasil penelitian ini membuktikan bahwa motivasi kerja berpengaruh positif signifikan terhadap produktivitas kerja, motivasi kerja berpengaruh positif signifikan terhadap keterikatan kerja, budaya digital berpengaruh positif signifikan terhadap produktivitas kerja, budaya digital berpengaruh positif signifikan terhadap keterikatan kerja , work engagement berpengaruh positif signifikan terhadap produktivitas kerja, work engagement memediasi hubungan motivasi kerja dengan produktivitas kerja, dan work engagement memediasi hubungan budaya digital dengan produktivitas kerja. Penelitian ini mempunyai arti bahwa jika suatu perusahaan ingin meningkatkan produktivitas kerja karyawannya, maka perusahaan harus mampu memberikan energi positif sebagai bentuk motivasi kerja dan budaya digital yang baik untuk meningkatkan work engagement karyawannya.
Registration of interferometric DEM by deep artificial neural networks using GPS control points coordinates as network target
Authors: Serwa Ahmed , Qasimi Abdul Baser , Isazade Vahid
Published: May 2024

The interferometric Shuttle Radar Topography Mission (SRTM) satellite’s digital elevation model (DEM) is an important tool for studying topographic features on a medium-spacing scale. Data were collected and processed using the satellite’s orbital and navigation parameters with selected global GPS stations for verification. Distortion may be expressed by surveying measurements, such as position, distance, area, and shape. This study focuses on this distortion and proposes a new registration method to reduce its effect. Because of generality, the purpose shapes were excluded from this study. The proposed registration method depends on precise GPS control points that act as the ground truth for describing the considered surveying measurements. The processing was carried out using deep artificial neural networks (DANN) to produce a new registered DEM. A comparison was made between the original DEM and the new one, focusing on the selected surveying measurements. Another comparison was made between the GPS coordinates and SRTM polynomials to determine the potential of the proposed system. Some statistical investigations were applied to determine the level of significance of the distortion in each surveying measurement. The study shows that the distortion is highly significant; therefore, the proposed registration method is recommended to fix the distortion. An important finding is the enhancement in local coordinates scope.
Perbandingan Metode Klasifikasi Maximum Likelihood dan Support Vector Machine dalam Pemetaan Genangan Banjir (Studi Area: Kawasan Danau Tempe)
Authors: Yani Nur , Sulistiawaty Sulistiawaty , Usman Usman
Published: May 2024

Abstrak. Penelitian ini bertujuan untuk mengetahui  potensi Citra Sentinel-1a menggunakan metode klasifikasi maximum likelihood dan metode klasifikasi support vector machine dalam mengindentifikasi genangan banjir  serta memban-dingkan ketelitian dalam pemetaan genangan banjir  di sekitar kawasan Danau Tempe. Untuk mencapai tujuan tersebut telah digunakan data citra sentinel-1A dengan akuisisi 3 Maret 2018 (sebelum banjir) dan 26 Mei 2018 (pada saat banjir). Data tersebut diambil, diolah, dan dianalisis di Lembaga Penerbangan dan Antariksa Nasional (LAPAN) kemudian mengecek dan mencocokkan kembali  data di lapangan. Data yang diperoleh diolah melaui tahap pengolahan awal interpretasi citra sentinel adalah Preprocessing data Sentinel-1A dengan menggunakan perangkat lunak SNAP 7.0.  Selanjutnya menggabungkan citra pre-flood dan post-flood menggunakan stack tools di software SNAP untuk menyatukan kedua citra tersebut menjadi satu citra. Citra hasil stacking selanjutnya dikomposit ke RGB, selanjutnya digunakan dua metode klasifikasi terbimbing yaitu maximum likelihood dan support vector machine. Hasil penelitian yang diperoleh adalah metode Maximum Likelihood dan Support Vector Machine (SVM) berpotensi mengidentifikasi genangan banjir dengan    nilai akurasi pemetaan genangan banjir pada metode  Support Vector Machine (SVM) lebih tinggi dibandingkan dengan metode Maximum Likelihood (MLC) dengan nilai akurasi metode SVM sebesar 50% dan  metode MLC sebesar 42.3%. Kata Kunci: Banjir, Citra Sentinel-1A, MLC, SVM
Cytotoxicity Test of Methanol Extract of Belajang Susu (Scindapsus pictus Hassk.) Against MCF-7 Breast Cancer Cells
Authors: Salempa Pince , Muharram Muharram , Jumadi Oslan , Pratiwi Diana Eka , Azis Musniati , Amaliah Nurul
Published: May 2024

Abstract. Belajang Susu Plant (Scindapsus pictus Hassk.) is a species of the genus Scindapsus including the Araceae family which has been traditionally used by the Mambi people for medicine. Plants from the genus Scindapsus contain active compounds such as calcium oxalate, flavonoids sulfate and a mixture of flavones and flavonols sulfate which can be used as anti-inflammatory, analgesic, antioxidant, anticancer and anti-tumor. This study aims to determine the potential of methanol extract of Scindapsus pictus Hassk. as an anticancer. Extraction was carried out by maceration with methanol and then tested for cytotoxicity against MCF-7 cancer cells. The results showed that the methanol extract of Scindapsus pictus Hassk. was very active against MCF-7 breast cancer cells with an IC50 value of 3.9861 μg / mL. Keywords: Belajang susu,  Scindapsus pictus Hassk., MCF-7The first section in your paper
Increasing energy values of biscuits with tempe purée and sardines flour as the ingredient substitutions
Authors: Widodo Slamet , Hudiah Andi
Published: May 2024

Abstract. This research and development study aims to investigate the energy values of biscuits made of tempe purée ad sardines flour (sardinella). The experiment was conducted in the Laboratory of Home Economics Department (PKK) in Engineering Faculty of Universitas Negeri Makassar. The used data collection technique is documentation from proximate analysis. The used data analysis technique is descriptive analysis. The process of making biscuits using tempe purée and sardines flour starts with weighing all the ingredients, mixing, weighing the dough for 1 biscuit, moulding the dough, placing in the oven and baking, remove from the oven and cooling, then packing the biscuits. The results showed that the nutritional values based on the proximate test of the biscuit formula with the substitution of tempe purée and sardines flour showed that the calorie value increased to 7.8 kcal, fat value increased to 1.72 grams, and calcium value increased to 5.59 grams. Keywords: Biscuit, Sardines Flour, Tempe Purée
Laboratory Control and Monitor Device Based on Relay With Raspberry
Authors: Tjandi Yunus , Zulhajji Zulhajji , Kasim Syarifuddin
Published: May 2024

Abstract. Observe in the Laboratory for student requires comfortable and safe conditions. Realize this, we need a control and monitor device to secure electrical device inside of laboratory. This research aims to : (1)  Build software laboratory control and monitor based on relay with raspberry to bridle electrical devices in the laboratory or office using smartphone, (2) Build laboratory control and monitor device based on relay with created software, (3) Build an interface and application of laboratory control and monitor based on relay with smartphone to bridle electrical devices in the laboratory or office whether in a close or wide range.The result shows that : (1) software of laboratory or office control and monitor based on relay serve properly, this is evidence by all controlled and monitored systems both in Miniatur Circuit Breaker (MCB) as well as various controlled loads, (2) Electrical control and monitor device based on relay serve properly, this is evidence by research trials using smartphone, (3) Applications and interface control systems based on relay with raspberry serve properly, this is evidence by control system trials using smartphone. Keywords: Control and Monitor Device, Relay, Raspberry, Laboratory’s Devices, Smartphone
Comparative Analysis of Temperature External and Internal and Relative Humidity of Electric Egg Incubator
Authors: Zulhajji Zulhajji , Yantahin Muliyati
Published: May 2024

Abstract. This study aimed to determine the ratio of external and internal temperatures and the humidity of the electric egg incubator. This research was designed in three stages. The first stage is the manufacture of an egg incubator, followed by the testing and analysis stage. Based on the data from the measurement and analysis results, it was found that the temperature and humidity in the incubator greatly influenced the quality of the hatching of native chicken eggs. This study used an experimental method and was carried out twice. The first stage of testing and measurement data obtained an average external temperature of 28.5°C, internal 38.2°C, and the humidity of the air in the hatchery room was 56.0%. In contrast, the second stage of testing and measurement obtained data on an average outside temperature of 28.42°C, inside 38,0°C, and humidity in the hatchery room 56.0%. It can be concluded that the ratio of outside and inside temperatures in the incubator must be balanced until the 21st day of hatching. In this case, if the outside temperature rises, the temperature inside the incubator must decrease, with the same relative magnitude. Likewise, the humidity inside must have relatively the same ratio to obtain a perfect hatching process, which is between 50% - 60%.
Rancang Bangun Sistem Pendeteksi Suhu Air Pada Lahan Rumput Laut Berbasis Atmega 328
Authors: Ali Baso , Karsa Iin Putri Karmila , N. Andi Rosman
Published: May 2024

Abstract. The study designed a seaweed water temperature detection device based on atmega 328 microcontrollers connected with sensors. The type of research is Research and Development (R&D) using a 4D development model.  The research site was conducted on seaweed cultivation land located around campus II of Cokroaminoto Palopo University.  Development of Atmega 328-based seaweed temperature detection tool through several stages, namely 1) defining / define, 2) design / design, 3) Development / develop, 4) Spread / disseminate.  The results showed that the Atmega 328-based temperature detection device had worked well.  Based on the results of validation by two experts related to the feasibility of atmega 328-based temperature measuring instrument obtained the result that the temperature measuring instrument is in the category is very good to use. This is evident from quantitative data and validator questionnaire stuffing and is supported by constructive comments and suggestions from each expert validator. The conclusion of validation results that the measuring instrument is worth testing in the field or at the research site.
Temporal Analysis of the Influence of the Number of Vaccinations on the Number of Covid-19 Cases in South Sulawesi Province Using ARIMAX Model
Authors: Aswi Aswi , Tiro Muhammad Arif , Sudarmin Sudarmin , Ruliana Ruliana , Taufik Andi Gagah Palarungi , Zulhijrah Zulhijrah
Published: May 2024

South Sulawesi is a province that has the highest number of Covid-19 cases in the Sulawesi island region. Vaccination is one way that is considered effective in controlling the infection of a disease. Covid-19 vaccination in Indonesia was carried out in January 2021. This study aims to obtain the best Autoregressive Integrated Moving Average X (ARIMAX) model in modeling the effect of the number of vaccinations on the number of Covid-19 cases in South Sulawesi Province. Data on the number of vaccinations and Covid-19 cases in South Sulawesi Province (October 1, 2021 - January 31, 2022) were used. The best ARIMAX model in modeling Covid-19 in relation to the number of vaccinations is ARIMAX (2,1,0). The results showed that the number of vaccinations had a negative effect on the number of Covid-19 cases at the significant level of 10%. This indicates that if the number of vaccinations increases then the number of Covid-19 cases will decrease.
SOLASI DAN IDENTIFIKASI SENYAWA METABOLIT SEKUNDER EKSTRAK METANOL AKAR NAPAS PEDADA (Sonneratia caseolaris L.)
Authors: Herawati Netti , Faika Sitti , Maryono Maryono , Ramdani Ramdani
Published: May 2024

Abstrak. Penelitian eksplorasi ini bertujuan untuk mengisolasi dan mengidentifikasi senyawa metabolit sekunder yang terdapat dalam ekstrak metanol akar S. caseolaris yang terdiri dari preparasi sampel, ekstraksi (maserasi) dengan metanol, fraksinasi dengan Kromatografi Kolom Cair Vakum dan Kromatografi Kolom Tekan, pemurnian dengan dekantasi dan identifikasi dengan uji pereaksi dan uji Spektroskopi. Sampel berasal dari muara sungai Waetuo, Kecematan Tanete Riattang Timur, Kabupaten Bone, Provinsi Sulawesi Selatan. Hasil penelitian berupa senyawa murni yaitu kristal putih berbentuk serbuk yang menunjukkan noda tunggal pada uji KLT sistem tiga eluen. Kristal menunjukkan hasil positif terhadap pereaksi Wagner dan Dragendorff. Hasil data spektrum FT-IR menunjukkan adanya gugus fungsi N—H primer, C—H alifatik, C—N, C—H (—CH2  dan  —CH3), C=C aromatik dan C=O. Berdsarkan data tersebut, menunjukkan bahwa senyawa yang diperoleh merupakan golongan senyawa alkaloid.Kata Kunci: Akar, Sonneratia caseolaris L., Alkaloid
SIFAT FISIK DAN KIMIAWI BATAKO RAMAH LINGKUNGAN
Authors: Pertiwi Nurlita , Ahmad Irma Aswani , Wirawan Gufran Darma
Published: May 2024

Abstrak. Inovasi bahan bangunan menjadi tantangan dalam industri konstruksi. Salah satu bentuk inovasi tersebut adalah pemanfaatan limbah dalam pembuatan batako ramah lingkungan. Kajian ini menguraikan tentang metode eksperimen untuk menemukan kualitas batako dengan penambahan limbah batu bata dan abu sekam padi. Peneliti membuat 60 sampel untuk tiga kelompok perlakuan untuk mendapatkan tingkat penyerapan air, kuat tekan dan sifat kimia batako pada batako normal, batako dengan 1.5% limbah batu bata dan batako dengan penambahan 1,5 limbah batu bata. Hasil analisis menemukan bahwa abu sekam padi memiliki potensi yang lebih baik sebagai bahan tambah batako dibandingkan dengan limbah batu-bata. Hal ini didukung dengan sifat kimia sampel tersebut yang menunjukkan kandungan silika yang lebih baik. Kata kunci: Penyerapan, Kuat Tekan, Pozzolan
The Effect of Acid Treatment on Metal Oxide Content of South Sulawesi Natural Clay
Authors: Side Sumiati , Putri Suriati Eka
Published: May 2024

Abstract. This study investigated the effect of adding acid on the metal oxide content of natural clay in Gowa Regency, South Sulawesi Province. The acid solutions used were sulfuric acid (H2SO4), hydrochloric acid (HCl), and nitric acid (HNO3) with a concentration of 3 M. The characterization of metal oxide content was carried out using XRF and morphological analysis of natural clay using SEM. The results showed that the impurity metal oxide content decreased after being treated with acid. The largest mass percent of silica alumina occurred in the HCl 3 M treatment with alumina mass percent of 20.27% and silica of 25.41%. The clay morphology looks different after being treated with acid for all types of acid solutions. The results of this study are expected to become recommendations for further research related to natural clay pretreatment both as a ceramic base material and as a catalyst support.
Karakteristik Batako Pejal di Kota Manado, Bitung dan Tomohon
Authors: Kafrain I Gede Yohan , Palandung Brayen N. , Pandean Lisa S.G.E , Rangkang Utarry E.
Published: May 2024

Abstract. Bricks is still one of the walls building materials that are widely used in North Sulawesi, specifically in Manado City, Bitung City and Tomon City. The purpose of this study was to determine the characteristics of local bricks in Manado City, Bitung City and Tomohon City. The characteristics of the bricks in question are the dimensions and compressive strength of the bricks. This research was conducted by taking samples of pejal bricks from several brick production sites in Manado City, Bitung City and Tomohon City. The bricks taken to be used as samples are pressed bricks. Brick samples that have been taken from these three cities, are then tested in the laboratory. From the test results in the laboratory, it is known that for the dimensions of the brick samples taken in Manado City and Bitung City, it has not met the brick size standards based on SNI 03-0349-1989, namely the brick length of 390 mm (+3&-5), width 190 mm (+2) with a thickness of 100 mm. The bricks taken from Tomohon City for length mostly meet the existing standards with width and thickness that have not met but are close to the standard.  The results of the compressive strength test for brick samples are only brick samples in Malalayang sub-district that meet the standards, including quality IV-III of 30.67 kg / cm2. None of the brick samples taken from Bitung City and Tomohon City met the compressive strength standards. Keywords: Brick, Building Material, SNI 03-0349-1989
Analysis of the Chemical Content of Virgin Coconut Oil (VCO) with Raw Material of Coconut From Walennae Village, Sabbangparu District, Sengkang Regency
Authors: Side Sumiati , Putri Suriati Eka , Musa Muhammad Iskandar
Published: May 2024

Coconut (Cocos nucifera L.) is a plant that provides many benefits to the rural economy. The part of coconut that has many benefits is the flesh of the fruit which can be taken from the coconut milk to make pure coconut oil which is commonly called Virgin Coconut Oil (VCO). In this study, the manufacture of VCO with the basic ingredients of old coconut from Walennae Village, Sabbangparu District, Sengkang Regency was carried out. This study aims to determine the characteristics of VCO in the form of peroxide number, Free Fatty Acid (FFA) number, and air content. The results showed the physical properties of the VCO produced, including the physical appearance of oil with a clear color, a distinctive aroma of oil, and no rancid smell. The results of the analysis of the chemical properties of the resulting VCO have a peroxidevalue of 1.5835 mg ek/kg; FFA number is 0.08% and water content is 0.18%.
Statistical Analysis and Prediction of Paddy Yield Using Neural Network
Authors: Rahman Abdul , Ismail Razali , Rozali Umie Asyikin binti , Arshad Khairil Anuar bin
Published: May 2024

Abstract. This research uses boxplot, Anova and posthoc to analyse the effect of factors such as urine and phosphorous in rice paddy yield. Then an artificial neural network (ANN) is used to predict paddy yields based on those factors. ANN is also used to predict paddy yields from polybags based on the actual data of paddy yields from rice field.  A total of 25 data were used in this study where 70% data were used for training while 15% data each for testing and validation. We use the training model using data from rice field to predict paddy yield in polybags. STATISTICA software was used to run the neural networks. The predictive power of constructed neural networks was measured using accuracy measurement Mean Squared Error. The result shows that prediction can be made through neural network since the performance is very encouraging. Keywords: neural networks, paddy yield, prediction, statistical analysis.
Analisis Kualitas Nastar Dengan Penambahan Tepung Ubi Jalar Ungu Hasil Pengeringan Cabinet Dryer Suhu 60oc
Authors: Sukainah Andi , Putra Reski Praja , Fadilah Ratnawaty
Published: May 2024

Abstrak. Ubi jalar (Ipomoea batatas) merupakan salah satu tanaman palawija yang banyak terdapat di Indonesia. Ubi jalar ungu memiliki kandungan gizi yaitu 1,1% serat, 18,2% pati, 0,4% gula reduksi, 0,6% protein, 0,70 mg zat besi dan 20,1 mg provitamin C serta mengandung komponen bioaktif yaitu antosianin sebanyak 150,7 mg.  Pengolahan ubi jalar menjadi tepung dapat menghasilkan suatu bentuk olahan produk pangan yang berbeda sehingga mudah diaplikasikan dalam kehidupan sehari-hari. Tepung ini tepat digunakan untuk membuat cookies dan kue-kue kering. Dalam penelitian ini nastar akan dibuat dari tepung ubi jalar ungu. Karena ubi jalar ungu mempunyai pigmen warna ungu yang alami sehingga dapat mempercantik tampilan nastar. Oleh karena itu penelitian mengenai analisis kualitas nastar dengan penambahan tepung ubi jalar ungu hasil pengeringan cabinet dryer suhu 60oc perlu dilakukan. Hasil penelitian menunjukkan penambahan tepung ubi jalar ungu dengan berbagai perlakuan memberikan pengaruh nyata terhadap kadar air, kadar abu dan kadar lemak nastar ubi jalar ungu yang dihasilkan. Penambahan tepung ubi jalar ungu 100% merupakan perlakuan terbaik pada parameter kadar air, kadar abu dan kadar lemak dan penambahan tepung ubi jalar ungu memberikan pengaruh nyata terhadap mutu hedonik nastar yang dihasilkan. Penambahan tepung ubi jalar ungu 50% merupakan perlakuan yang disukai panelis, baik dari segi rasa, aroma dan tekstur. Sedangkan pada parameter warna panelis lebih menyukai perlakuan 75%.
Pengaruh Aktivasi Terhadap Morfologi Karbon Aktif Dari Kulit Kacang Tanah
Authors: Side Sumiati , Pratiwi Diana Eka , Ilyas Nita Magfirah , Rahim Mega Putri Aulia , Putri Suriati Eka
Published: May 2024

Abstrak. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh proses aktivasi terhadap karakteristik karbon aktif dari kulit kacang tanah. Penelitian ini terdiri dari tahapan preparasi sampel, tahapan karbonisasi karbon, aktivasi karbon, dan karakterisasi menggunkaan Scanning Electron Microscope (SEM). Aktivator yang digunakan pada penelitian ini adalah H3PO4 dan ZnCl2. Hasil yang diperoleh menunjukkan adanya perbedaan morfologi permukaan karbon sebelum dan setelah aktivasi. Morfologi permukaan karbon dari kulit kacang tanah menunjukkan adanya pori setelah dilakukan proses aktivasi. Jumlah pori yang banyak dihasilkan dengan menggunakan aktivator H3PO4 sedangkan pori dengan penampakan pori yang lebih kecil dihasilkan dengan menggunakan aktivator ZnCl2
Identifikasi Fraksi Dan Uji Toksisitas Ekstrak Metanol Batang Kelor (Moringa oleifera Lamk.)
Authors: Salempa Pince , Wijaya Mohammad , Faika Sitti , Sulfikar Sulfikar , Abbas Gusma Harfiana
Published: May 2024

Abstrak. Tumbuhan kelor (Moringan oleifera Lamk.) termasuk dalam famili Moringaceae yang memiliki banyak manfaat, salah satunya yaitu anti bakteri. Penenlitian ini bertujuan untuk mengetahui kandungan fraksi ekstrak metanol dan uji  toksisitasnya. Batang kelor yang sudah di haluskan di maserasi dengan metanol, kemudian di evaporasi untuk menghasilkan ekstrak kental. Ekstrak kental yang dihasilkan kemudian di fraksinasi menggunakan keomatografi kolom cair vakum. Fraksi yang dihasilkan kemudian di analisis menggunakan GC-MS dan BSLT (Brine Shrimp Lethality Test). Hasil yang diperoleh yaitu, fraksi mengandung senyawa utama  Hexadecanoid acid dan 6-octadecanoid acid. Adapun nilai LC50  yang dihasilkan yaitu sebesar 90.012 ppm yang menunjukkan bahwa fraksi bersifat toksik
Development of a Conservative Hamiltonian Dynamic System for the Early Detection of Leaks in Pressurized Pipelines
Authors: Ladino-Moreno Edgar Orlando , García-Ubaque César Augusto , Zamudio-Huertas Eduardo
Published: May 2024

In this study, we propose an innovative approach for real-time leakage detection in pipelines by integrating conservative Hamiltonian equations and experimental Internet of Things (IoT) technologies. The proposed method combines a hybrid model that utilizes sensors and IoT devices to acquire real-time data and solves the coupled system of Hamiltonian equations using the ODE45 numerical integration method. Spectral frequency analysis is an essential part of this method, as it reveals specific patterns in the pressure and flow signals. The findings highlighted 95% accuracy in leak detection, which was validated through a comparison of the theoretical and experimental data. The novelty of this approach lies in its ability to maintain constant total system energy, thereby enabling continuous monitoring for early leak detection. As an improvement, the proper handling of sensor signals is emphasized, underscoring its contribution to the efficient management of water resources in potable water distribution systems. Doi: 10.28991/CEJ-2024-010-04-01 Full Text: PDF
Valuation of Urban Green Open Spaces Using the Life Satisfaction Approach
Authors: Setiowati Retno , Koestoer Raldi H.
Published: May 2024

This study conducts the valuation of the urban Green Open Spaces (GOS) in Jakarta (Indonesia) using the life satisfaction approach (LSA). We integrated the important elements of the LSA, such as housing structure and environmental facilities, into a comprehensive valuation model (using hedonic variables). By explicitly acknowledging the limited application of these methodologies in developing nations, this study endeavors to provide a context-specific understanding of the economic value of GOS in Jakarta. The LSA model, a novel non-market valuation tool, employs community life satisfaction as its primary metric. In this study, we analyzed the satisfaction levels of residents of Jakarta based on a 10-point scale; the responses of a total of 1,592 participants were collected through online questionnaires in 2021 (during the pandemic). We considered various independent variables, including socioeconomic factors, housing attributes, environmental facilities, location amenities, and the presence of GOS. The analysis involved LSA and ordinary least squares (OLS) models in the Statistical Package for the Social Sciences (SPSS). The results indicate that several variables, such as longer residence duration, good employment status, high income “over 20 million Indonesian Rupiah (IDR); approximately USD 1281.56”, and access to more shopping centers, positively influenced the life satisfaction of the residents, which is in line with the studies conducted in western countries. Surprisingly, the economic evaluation of urban GOS portrayed a limited impact on the residents’ life satisfaction, while negative aspects, e.g., the presence of cemeteries around residential areas (19.1%), impacted the residents significantly. Urban parks did not portray statistical significance in influencing the residents’ life satisfaction, despite having a positive impact across all radii of urban regions. Urban forests exhibited a positive impact, mainly within the 100–500-m radius, with a significant impact on resident life satisfaction. Our attempt to assess the values of landscape amenities in Jakarta using LSA marks a pioneering effort in the field of environmental science with respect to community preferences. Consequently, this study contributes significantly to the evolving yet limited literature in this domain. The results differ from those of the Global North research, emphasizing the need for context-specific urban planning strategies. Our study offers valuable insights for urban planners and government entities and can guide GOS development to enhance urban sustainability and community satisfaction. The implications extend to urban centers in Indonesia and other developing countries, emphasizing the importance of optimizing limited urban spaces based on community preferences. Doi: 10.28991/CEJ-2024-010-04-010 Full Text: PDF
Utilization of Sand Cushion for Stabilization of Peat Layer Considering Dynamic Response of Compaction
Authors: Basha Ali , Azzam Waseim , Elsiragy Mohamed
Published: May 2024

Soft peat soils are located in many zones and at a given depth all over the world and are characterized by their low shear strength and high settlement. It can also cause progressive failure of roads, embankments, and foundations. Sand cushioning is the most beneficial technique used to relieve the stress transmitted to the peat layer to mitigate any deformation and shear failure. In this research, a field study of a road with a soft peat layer located at a depth 4m below the ground surface is carried out. The plate load test is conducted on three cases over the peat layer using sand cushions with and without reinforcement. The results were compared with plate footing on the surface of the road without stabilization. The field tests of the improved technique were verified and deeply analyzed using the numerical program Plaxis. The finite element analysis mainly sheds light on the simulation of the dynamic response that represents the compaction of the sand cushion over the peat layer. A series of numerical models has been done considering the effect of repeated load compaction on the adopted sand cushions with and without reinforcement. The numerical analysis is directed to show the effect of repeated loads of compaction equipment that were used on decreasing the stress over the peat layer. The results showed that the composite compacted cushion with both a higher number of cycles and stress has a great effect on relieving the stresses transmitted to the face of the peat. As a result, the footing capacity is increased with less deformation. Doi: 10.28991/CEJ-2024-010-04-011 Full Text: PDF
Applying Harmony Degree Equation and TOPSIS Combined with Entropy Weights in Surface Water Classification
Authors: Le Kieu Diem , Nguyen Giao Thanh
Published: May 2024

This study classified surface water quality in Can Tho city using the Eutrophication index, Harmony Degree Equation (HDE), and Technique of Order Preference by Similarity to Ideal Solution (TOPSIS). Water quality data were collected in two seasons at 38 locations with 18 parameters, including temperature, pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), nitrite (N-NO2-), nitrate (N-NO3-), ammonium (N-NH4+), orthophosphate (P-PO43-), Fe, F-, Pb, As, Hg, coliform, chlorine-, and phosphorus-based pesticides. Water quality parameters are compared with national technical regulations on surface water quality (QCVN 08-MT:2015/BTNMT). The HDE method based on entropy weight has been applied to evaluate the comprehensive harmony degree of water quality for various purposes. In addition, the TOPSIS was also used to rank water quality at each location and determine the priority level that required mitigation and treatment solutions. Surface water quality in the study area had low dissolved oxygen content and was contaminated with TSS and coliform in both seasons. Water quality in the rainy season tends to decrease compared to the dry season. Based on HDE results, water quality in the study area in the dry season was assessed as suitable for domestic activities (needs treatment), irrigation, and navigation (HDII = 0.922), while the rainy season was suitable for irrigation and navigation (HDIII= 1.00). Moreover, surface water in the study area was in a state of potential eutrophication (EI > 0), in which eutrophication was higher during the dry season. The SW25 and SW28 were the most seriously eutrophic in the dry and rainy seasons, respectively. TOPSIS analysis indicated that SW22 and SW28 need treatment measures in both seasons; furthermore, SW2-SW4 (dry season) and SW23 (rainy season) also need appropriate management and impact mitigation solutions. SW4 was affected by the most significant seasonal impacts, which have high priority in the dry season and are lowest in the rainy season. Therefore, future studies are needed to identify specific sources of variation at these locations to reduce impacts. The study results provide helpful information for the decision-making process and water quality management. Doi: 10.28991/CEJ-2024-010-04-012 Full Text: PDF
Highlighting Traffic Accidents on Roundabouts Using MRSS-AHP Expert System
Authors: Suleiman Ghassan , Younes Mohammad K. , Ergun Murat , Abushammala M. F. , Aljaradin Mohammad
Published: May 2024

The frequency and severity of traffic accidents are causing growing concern. This study aims to develop a tool to improve the traffic safety level on roundabouts and identify the influence of traffic operations, geometric parameters, weather, and time of day on improving roundabout traffic safety. It is the first study to evaluate the performance of the integrated Median Ranked Set Sample (MRSS) and Analytic Hierarchy Process (AHP) with statistical analysis. A hierarchy tree of accident causes has been developed using data gathered from accident reports and relevant authorities. Then, the selected stakeholders’ professionals prioritized the traffic accident causes using a MRSS and AHP. Moreover, traffic microsimulation software VISSIM was also used to extract traffic operation parameters for the analysis. Afterwards, Analysis of Variance (ANOVA) was used to validate the causes of traffic accidents. The results show that geometric design accounts for 36% of accidents at roundabouts, followed by traffic operation (22%). However, conflicting and queuing lengths are responsible for about 20% of traffic accidents. The tools developed, and the causes of accidents determined in this study will help geometric designers and city planners to take the necessary measures to minimize accidents and enhance traffic safety levels in urban areas. Doi: 10.28991/CEJ-2024-010-04-013 Full Text: PDF
Monitoring Physiological State of Drivers Using In-Vehicle Sensing of Non-Invasive Signal
Authors: Abdul Razak Siti Fatimah , Sayed Ismail Sharifah N. M. , Hii Ben Bin Bryan , Yogarayan Sumendra , Abdullah Mohd Fikri Azli , Kamis Noor Hisham
Published: May 2024

Eighty percent of traffic accidents are caused by human error, called hypo vigilance, stemming from drowsiness, stress, or distraction while driving. This poses a significant threat to road safety. An electrocardiogram (ECG) is often used to monitor drivers' health. Thus, enhancing vehicles with Internet of Things (IoT) sensors and local analytical databases becomes crucial for real-time detection and transmission of relevant health data to avoid things that compromise road traffic safety. This study introduces a cost-effective in-vehicle ECG sensing prototype using an AD8232 sensor integrated with an Arduino Uno and an AD8232 Wi-Fi module placed on the steering wheel to monitor the driver's heart signal while driving. Short-term heart rate variability (HRV) features were computed through Python from the acquired ECG data, and supervised machine learning techniques such as AdaBoost, Random Forest, Naïve Bayes, and Support Vector Machine (SVM) classified the features into normal and abnormal classes. Naive Bayes exhibited the highest accuracy (90.91%) and F1 score (85.71%), surpassing Random Forest's lower accuracy (63.64%) and F1 score (50.00%). These findings indicate the prototype's potential as a valuable tool for ensuring safe and efficient driving, proposing integration into standard vehicle safety systems for enhanced road traffic safety. Doi: 10.28991/CEJ-2024-010-04-014 Full Text: PDF
Investigating Barriers to the Adoption of Energy Management Practices for Sustainable Construction Projects: SEM and ANN Approaches
Authors: Alhammadi Yasir , Kineber Ahmed Farouk , Alhusban Mohammad
Published: May 2024

This research addresses the critical challenges hindering the integration of Energy Management Practices (EMPs) within the construction industry, impeding its progress toward sustainability. Recognizing the pivotal role of EMPs in fostering sustainable practices, this study aims to fill a notable research gap by conducting a meticulous survey involving 100 industry professionals. Through the application of Partial Least Squares Structural Equation Modeling (PLS-SEM) and Artificial Neural Network (ANN) analyses, this study provides a comprehensive exploration of the intricate barriers and their interrelated dynamics within the construction sector. The findings reveal significant financial obstacles, including higher initial costs and limited financing options, underscoring the need for interventions to alleviate financial constraints. Additionally, policy and regulatory challenges, such as limited government incentives and shifting energy management rules, are identified, highlighting the necessity for stable and supportive regulatory environments to foster EMP adoptions. This research provides unique insights into the barriers hindering EMP adoption within the construction sector. The implications of this study extend beyond EMP adoption, offering a foundation for advancing sustainable practices in the construction industry. The insights gained can inform both academic research and practical decision-making, contributing to the ongoing discourse on sustainability in construction. Doi: 10.28991/CEJ-2024-010-04-015 Full Text: PDF
Examining Soil Microplastics: Prevalence and Consequences Across Varied Land Use Contexts
Authors: Walenna Muhammad A. , Hanami Zarah A. , Hidayat Rachmat , Damayanti Annisa D. , Notodarmojo Suprihanto , Kurniaty . , Caroles Lucky
Published: May 2024

In an extensive exploration of microplastics within soil environments, our study aims to investigate the presence, spread, and ecological impact of microplastics in soil, focusing on Makassar City, Indonesia. Using a Sinher binocular digital microscope, we visually examined soil samples in Petri dishes, measuring microplastic sizes with Image-J software. Fourier-transform infrared (FTIR) spectroscopy was also employed for additional identification and analysis of polymer compositions. Our research uncovered a widespread presence of microplastics across diverse soil types and land uses, including residential, fishpond, agricultural, landfill, coastal, and bareland areas. The concentration of these microplastics was found to be between 16.6 to 21.9 particles/gram, showing consistency across most land uses, with some variations in coastal areas. We noted a significant variety in microplastic forms, predominantly fragments and films, across the different land uses. A wide range of colors was observed, including blue, green, red, and transparent. Polyethylene (PE) and polypropylene (PP) were identified as the predominant polymers. Our study highlights the non-uniform distribution of microplastics in soil, suggesting potential significant impacts on soil organisms and the wider ecosystem. These findings underscore the critical need for more comprehensive research on the ecological implications of microplastics in soil environments. Doi: 10.28991/CEJ-2024-010-04-017 Full Text: PDF
Mechanical and Microstructural Properties of Geopolymer Concrete Containing Fly Ash and Sugarcane Bagasse Ash
Authors: Rihan Mohammed Ali M. , Onchiri Richard O. , Gathimba Naftary , Sabuni Bernadette
Published: May 2024

Portland cement plays a vital role in construction and building projects. However, its manufacturing process releases detrimental pollutants and contributes to climate change. The environmental concerns linked to the manufacturing of conventional Portland cement, such as its high energy demands, raw material consumption, and significant CO2 emissions, have prompted the need to look for alternatives such as geopolymer or green concrete. In addition, indiscriminate disposal of waste might have a detrimental effect on the environment. This paper investigates the mechanical and microstructural properties of geopolymer concrete incorporating fly ash and sugarcane bagasse ash as primary constituents. Sugarcane bagasse ash (SCBA) was employed as a partial substitute for Fly Ash (FA), with varying proportions ranging from 5% to 20% with increments of 5%. Alkaline activators utilized were NaOH (14M) and Na2SiO3, with a ratio of 1.5. Various tests, including the slump test, compressive strength test, splitting tensile strength test, and flexural strength test, were performed. The microstructural characteristics were assessed by scanning electron microscopy (SEM), energy dispersive analysis (EDS), and X-ray diffraction analysis (XRD). The results revealed that adding sugarcane bagasse ash influenced the workability of geopolymer concrete while enhancing its mechanical properties. The research findings have shown that the mixture comprising 5% SCBA has the greatest compressive strength of 64 MPa. Doi: 10.28991/CEJ-2024-010-04-018 Full Text: PDF
Seismic Resilience of Steel-Braced Frames Incorporating Steel Slit Dampers: A Review and Comparative Numerical Analysis
Authors: Al-Sadoon Zaid A. , Almohammad-albakkar M.
Published: May 2024

Steel dampers, specifically steel slit dampers (SSDs), are crucial for enhancing the seismic resilience of buildings by absorbing energy and mitigating damage. SSDs are celebrated for their ability to produce stable hysteretic behavior, owing to the inelastic deformation of their strips, alongside benefits such as lightness, ease of manufacture, and straightforward post-earthquake replacement. This research extensively examines SSD applications, design principles, and innovations in their modeling, optimization, and production processes. The literature highlights SSDs' consistent performance in resisting both compression and tension, their adaptability in strength, ductility, and energy dissipation through modifications in strip configurations and the superiority of non-prismatic and hourglass-shaped designs over traditional options. Numerical analyses have been conducted to assess the effectiveness of non-prismatic slit dampers in comparison to their prismatic counterparts within braced frames. Three distinct braced frame configurations have been analyzed: one with a diagonal brace without a damper, another featuring a uniform prismatic slit damper, and a third incorporating a non-prismatic slit damper with an hourglass shape. The analysis primarily compared these systems' hysteresis behavior, ductility, and energy dissipation capacities. Results indicate a significant enhancement in performance when utilizing non-prismatic slit dampers. Notably, these dampers exhibited a remarkable 69% increase in cumulative energy dissipation compared to prismatic ones. Furthermore, the study reveals that a steel slit damper-braced frame, when equipped with optimally designed slit geometries, can tolerate inter-story drifts in excess of 2% while simultaneously achieving a greater than 12% increase in energy dissipation efficiency. Doi: 10.28991/CEJ-2024-010-04-019 Full Text: PDF
Corrosion Resistance of Reinforcing Steel in Concrete Using Natural Fibers Treated with Used Engine Oil
Authors: Flores Nicolás Alejandro , Menchaca Campos Elsa C. , Flores Nicolás Mario , Gonzalez Noriega Omar A. , García Peréz Cesar A. , Uruchurtu Chavarín Jorge
Published: May 2024

The addition of natural fibers in the elaboration of concrete pastes has increased as an innovative alternative for the development of more ecological and environmentally friendly constructions. The objective of this research is to incorporate natural fiber residues from palm leaves and mango stone impregnated with used engine oil (UEO) in the cement matrix to improve the mechanical and electrochemical properties of reinforced concrete. Samples with fiber percentages of 0.2% and 0.4% with respect to the weight of the sand with a length of 10 mm were fabricated. Their properties, such as workability, air content, porosity, and compressive and flexural strength, were analyzed. To understand the corrosion rate of the steel bars, electrochemical techniques of corrosion potential, electrochemical noise, linear polarization resistance, and electrochemical impedance spectroscopy were applied to cubic samples exposed in a 3% sodium chloride saline environment for 365 days. The experimental results showed a positive effect on the corrosion phenomenon with the UEO and mango fiber treatment, decreasing the corrosion rate due to the formation of a protective film at the steel/concrete interface. Doi: 10.28991/CEJ-2024-010-04-02 Full Text: PDF