bluuebunny/crossref_metadata_2025_split huggingface dataset:
Advanced Miniaturized Microstrip Patch Antenna Design for High-Efficiency 5G Applications
Authors: Janarthanan S , Bennet M Anto 
Published: December 2024

Abstract
This work presents a compact microstrip patch antenna design for 5G applications, which operates in 25 GHz, 28 GHz, and 32 GHz frequency bands and provides triple-band functionality. The proposed antenna has a compact volume of 15.4 × 12.8 × 1 mm, contributing to its miniaturization, which is crucial for 5G communication systems. To optimize return loss characteristics, a line slot is introduced on the patch. The slot width is optimized using an XGBoost prediction model, which serves as an objective function for a Coati optimization technique. This optimization aims to achieve an optimal slot length that results in a superior return loss of -30 dB. The proposed antenna shows a peak gain of 7.3 dB at 28 GHz and exhibits an exceptional radiation efficiency of 98 %. The design and manufacture of this antenna validates its high gain and superior return loss in the specified triple bands, making it suitable for reliable and efficient 5G communication systems. The combination of compact size, high gain, and efficient return loss optimization ensures that this antenna meets the demanding requirements of modern 5G technology. The use of advanced optimization techniques, such as the XGBoost prediction model and Coati optimization, highlights the innovative approach of this design. This methodology not only improves the antenna's performance but also ensures that it can be effectively integrated into compact 5G devices, providing robust and high-quality communication capabilities. The success of this design underlines its potential for widespread application in the rapidly evolving field of 5G communications and offers a promising solution for future wireless technologies.
Research of Online Error Prediction and Parallel Algorithm for Voltage Transformer in Smart Grid
Authors: Xin Xianfeng , Chen Rongye , Lin Cong , Liu Qingchan , He Zhaolei , Li Tengbin , Yang Guangrun , Kochan Orest , Karpa Mykhailo 
Published: December 2024

Abstract
Online voltage transformer error prediction is an important research direction in the field of smart grids. This article mainly focuses on the online error prediction and the parallelization method of voltage transformers. First, an optimized multi-layer perceptron model based on the sparrow search algorithm (SSA) is proposed. The weight initialization process is optimized using the SSA to improve the prediction accuracy of the multi-layer perceptron. Considering the massive amount of data in real-world scenarios, a distributed sparrow search optimization algorithm for the multi-layer perceptron model was then developed, and the acceleration and scalability were tested on different data scales. In addition, transformer error prediction experiments were conducted to demonstrate the performance of the proposed algorithm.
Assessing the Effectiveness of the Compensation Regime in Ghana’s Mining Sector: Challenges, Limitations, and Opportunities for Improvement
Authors: Dr. Kweku Ainuson  
Published: December 2024

This paper examines the effectiveness of the compensation regime in Ghana's mining sector. Ghana's mining industry has played a significant role in its economic development. However, the current compensation framework for land owners and occupiers affected by mining activities is inadequate. The legal framework governing compensation for landowners affected by mining activities focuses primarily on economic compensation, neglecting the cultural and religious significance attached to the land.
This paper advocates for the integration of a Free, Prior, and Informed Consent (FPIC) framework into Ghana's mining laws to empower local communities with the right to oppose mining activities on their land. This paper is structured into six main parts: ownership regimes, compensation frameworks, compulsory acquisitions, a literature review on compensation shortfalls, issues of dispossession and rights violation, and proposed amendments to enhance community rights and compensation mechanisms.
Influence of People as a Marketing Mix on the Performance of Private Universities in Nairobi City County, Kenya
Authors: Enid Mbuba Igoki  , Rael Nkatha Mwirigi  , Agnes Kinanu Mungania  
Published: December 2024

A comprehensive plan specifically created for attaining a firm's objectives is known as a marketing mix strategy. It offers a strategy for achieving marketing goals. Private Universities are facing competition from public universities and tertiary institutions, which include National and Local polytechnics, under government sponsorship. This competition has resulted in low enrolment and decreased graduates in some Private Universities. Private universities, being purely in the service industry, apply extended marketing mix elements such as processes, people, and physical evidence to increase student enrollment. The general objective of the study was to investigate the effect of extended marketing mix elements on the performance of private universities in Nairobi City County, Kenya. The specific objective of the study was to determine the effect of people on the performance of private universities in Nairobi City County, Kenya. The study was anchored on Resource-based theory. The study adopted a descriptive research design. The target population of the study was 1867 respondents comprising academic and administrative staff from 9 chartered private Universities in Nairobi City County, out of which a sample of 330 was selected. A questionnaire was the main instrument of data collection. Simple and Multiple Linear Regression analysis was done with the aid of statistical packages for social sciences (SPSS) version 25.0 to assess the relationship between variables. F-statistics and were used to test the hypothesis. Results are presented using descriptive and inferential statistics. F-value for academic staff was found to be (33.128), and a p-value (0.000) shows that the model used was statistically significant since p = 0.000 > 0.05). The findings of this research show that the people element is a good predictor of private university performance, according to academic staff. The F-value for the people element for administrative staff was (274.917) and a p-value of .000 shows that the model used is statistically significant since p = 0.000 < 0.05). The findings of this research show that the people element is a good predictor of private university performance according to administrative staff performance in private universities. The study concluded that people had a significant effect on the performance of private universities in Kenya. The study recommends that private universities should develop and implement extended marketing mix elements that enhance people who are qualified to ensure increased performance. The findings are useful to universities in helping them design effective extended marketing mix strategies that boost performance. The study findings also contribute to the theory of extended marketing mix and performance in private universities.
A Cross-sectional Study on Prevalence of Depression and its Association with Overweight and Obesity among Students of a Medical College of Tripura
Authors: Nag Kaushik , Tripura Kaushik , Datta Anjan , Karmakar Nabarun , Sen Sujata 
Published: December 2024

Background:
Medical students are subjected to tremendous physical, emotional, and social stress. Depression is highly prevalent among medical students.

Objectives:
The objective of this study was to know the prevalence of depression and its association with overweight and obesity among students of the Medical College of Tripura.

Material and Methods:
This was a cross-sectional study among Medical Students of Tripura Medical College from January 2020 to February 2020. A total of 75 students were included in this study, considering 10% as a non-response rate. Then, 25 students are taken from each semester by simple random sampling (lottery method) technique. Beck Depression Inventory scale, along with a pre-tested semi-structured questionnaire, was used to collect data. Collected data were compiled and analyzed on the Statistical Package for the Social Sciences v.16. P < 0.05 was considered statistically significant.

Results:
The prevalence of depression among medical students was 60%. Obesity and overweight were seen among 24% of students. Depression was more common in the <20 years age group (64.3%), males (61.2%), schedule caste (85.7%), and students from the middle class (75%). Depression was seen among 55.6% of overweight and obese students.

Conclusion:
The present study has shown that the prevalence of depression in medical students is very high, and a similar trend has been seen in studies done globally. Depression was more common in <20 years, male, overweight, and obese medical students. Future research such as the role of mental health promotion programs, regular practice of yoga, and exercise in the reduction of depression and obesity in medical students, might be helpful.
Depression, Anxiety, and Stress Levels among Medical Students and Interns in a Medical College of Kolkata: A Cross-Sectional Study
Authors: Chakraborty Arup , Jha Ayush , Banerjee Ankush , Banerjee Nibedita , Saha Debarshee , Das Ayush 
Published: December 2024

Background:
Medical students and interns are the future backbone of the medical fraternity and healthcare system in India. There have been increasing concerns raised on their mental health and wellbeing over the past decade.

Objectives:
This study thus assessed the presence of depression, anxiety and stress among undergraduate medical students and interns in a medical college of Kolkata and elicit its associates.

Material and Methods:
This cross-sectional study was conducted among 340 medical students and interns of Medical College, Kolkata from November 2023 to January 2024. The validated DASS-21 was utilized to assess depression, anxiety and stress among the study participants selected by stratified random sampling across all batches. Data were analyzed using SPSS.

Results:
Depression, anxiety and stress was present among 109 (32.0%), 138 (40.6%) and 46 (13.5%) participants. Chi-square revealed female gender to be associated with the presence of anxiety and stress. Substance usage was detected as an important predictor for the presence of stress among the study participants.

Conclusion:
Utmost care should be taken for the betterment of mental health and well-being of medical students. Awareness generation and one-to-one counseling sessions through motivation should be conducted especially for the vulnerable participants. Parents and peers can act as buffers to help those students to cope with stressful circumstances.
Pattern of Utilization and Indications of Use of Blood and Blood Products in a Tertiary Care Hospital of West Bengal
Authors: Ishore Kaushik , Nandy Pratyasha , Mukherjee Tanmoy 
Published: December 2024

Background:
Blood cannot be artificially manufactured, nor have we found a proper, well-rounded substitute. This makes proper utilization of the donated blood a task of immense value. Contamination of the blood makes it non-utilizable; hence, proper use of blood and blood products is extremely important to avoid any wastage of these scarce resources.

Objectives:
The objective of this study was to assess the utilization pattern of blood and blood components and the indications of use of blood components in a tertiary care hospital.

Material and Methods:
An observational cross-sectional study was conducted for a period of months (July 2023 – September 2023) in the blood bank department of a tertiary care hospital in North Bengal. Secondary data were collected by reviewing the records, registers, and computer-stored data at the blood bank and pre-designed, pre-tested data collection schedule. Data were organized and presented using the principles of descriptive statistics for demographic and clinical variables.

Results:
There were a total of 4965 transfusion requisitions during the study period. Packed red blood cells (RBCs) were the most demanded blood component (42%), followed by fresh frozen plasma (24%), platelets (23%), and then whole blood (11%). The commonest indication for blood transfusion was pregnancy/childbirth-related cause (27%) followed by elective surgery (23%). Requisition of the blood components was found to be maximum by the medicine department (43%), followed by the gyne and obstetrics department (16.5%).

Conclusion:
Periodic review and audit of blood component usage is very much essential to assess the blood utilization pattern in any hospital.
Analisa Pengaruh Campuran Batang Karet dengan Matriks Limbah Plastik (PP) pada Komposit Papan Partikel Terhadap Kekuatan Uji Tekan dan Uji Bending
Authors: Yulianto Dody , Hastuti Kurnia , Suherman Hendra , Mustaqim Muhamad 
Published: December 2024

Karet adalah tanaman yang banyak dibudidayakan oleh masyarakat karena harga jual yang tinggi sehingga dapat meningkatkan perekonomian masyarakat. Akan tetapi beberapa fenomena yang terjadi belakangan ini menyebabkan harga jual karet menurun. Sehingga petani melakukan tindakan alih fungsi lahan perkebunan karet menjadi sawit. Karena adanya faktor ekonomi membuat petani beranggapan sawit lebih menguntungkan dibandingkan karet. Sehingga menghasilkan limbah batang karet yang begitu banyak , Maka penelitian ini mengunakan batang karet, Serta pengunaan matriks limbah plastik ( PP ) dalam pembuatan papan partikel. Tahapan penelitian dimulai dari penyaringan partikel batang karet dan pencacahan limbah plastik ( PP ), Pencampuran dan Pembentukan papan partikel, Sampai pada Pengujian. Untuk mengetahuai kekuatan papan partikel maka diperlukan pengujian mekanik seperti pengujian Tekan dan pengujian Bending sehingga dapat mengetahui nilai kekuatan tertinggi dari pencampuran partikel dan matriks. Adapun campuran yang dilakukan dalam penelitian ini adalah sebagai berikut : 50% Partikel 50% Plastik , 60% Partikel 40% Plastik dan 70% Partikel 30% Plastik. Dari hasil pengujian yang dilakukan didapat kekuatan tekan tertinggi yaitu 6,48 MPa pada campuran 60% partikel 40% Plastik sedangkan untuk pengujian kekuatan tekan terendah yaitu 4,06 MPa pada campuran 70% Partikel 30% Plastik. Serta dalam pengujian bending didapat nilai tegangan tertinggi 7,71 MPa pada campuran 50% Partikel 50% Plastik sedangkan untuk pengujian bending terendah yaitu 5,10 MPa pada campuran 70% Partikel 30% Plastik. Dapat disimpulkan bahwa limbah batang karet dan plastik ( PP ) dapat digunakan dalam pembutan papan partikel sehingga menghasilkan suatu produk untuk kebutuhan masyarakat serta menggurangi dampak lingkungan yang tidak sehat, Diakibatkan menumpuknya Limbah Plastik dan Limbah batang Karet.
Perencanaan Mesin Pengupas Sabut Kelapa dengan Menggunakan Mata Pisau Miring
Authors: Alridho Arzam , Syawaldi  , Anwar Irwan 
Published: December 2024

PERENCANAAN MESIN PENGUPAS SABUT KELAPA DENGAN MENGGUNAKAN MATA PISAU MIRING

Arzam Alridho1, Syawaldi2, Irwan Anwar3
Program Studi Teknik Mesin Fakultas Teknik Universitas Islam Riau
Jl. Kaharudin Nasution Km 11 No. 113 Perhentian Marpoyan, Pekanbaru
Telp. 0761-674635 Fax. (0761) 674834
E-Mail : arzamalridho22@gmail.com

ABSTRAK

Sebagai penelitian tugas akhir Hasil analisa dari peneletian diperoleh gaya tekan kelapa sebesar 98,3 N dengan diberikan beban pada kelapa sebesar 17,5 kg sehingga sabut kelapa dapat terkupas, dan daya poros pengupas untuk mengupas yang dihasilkan sebesar 627,1 Watt, penggerak utama menggunakan motor diesel dengan daya sebesar 5 pk (3728,5Watt) dengan putaran 2400 rpm. Data-data lain, untuk torsi sebesar 69,97Nm, dan diameter poros satu 3,5 cm, diameter poros kedua 3,5 cm adalah 45 rpm dan pada poros ketiga berdiameter 3,5 cm dengan putaran 23 rpm dengan putaran pada puli 1371,4 rpm, Proses kerja alat ini lebih cepat dan mudah digunakan dibandingkan secara tradisional yaitu mesin pengupas sabut kelapa, waktu pengupasan 1 buah kelapa dengan waktu 13 detik. Diharapkan alat ini dapat digunakan dan dikembangkan untuk masyarakat usaha kecil dan menengah.

Kata kunci : Gaya, Daya,Diameter, putaran dan waktu pengupasan.
Perancangan Mesin Pengaduk Tepung Tipe Horizontal dengan Menggunakan Motor Listrik Sebagai Penggerak dan Pulley Sebagai Putaran Daya
Authors: Cahyono Rahmad , Yulianto Dody , Syawaldi  
Published: December 2024

Abstrak

Perancangan alat ini memiliki tujuan untuk mendesain alat dan meningkatkan pertumbuhan ekonomi di UKM (Usaha kecil menengah) sehingga dapat mempermudah pekerjaan dilapangan. Untuk pengoperasian mesin pengaduk tepung tipe horizontal ini menggunakan motor listrik sebagai penggerak dan pulley sebagai putaran daya. Sementara pergerakan pisau pengaduk menggunakan batang panjang 20 cm dan diameter 1,5 cm. spesifikasi mesin pengaduk tepung tipe horizontal ini adalah menggunakan motor listrik 4 Hp dengan putaran 2440 rpm dengan daya 2,98 KW dan pulley sebagai penerus putaran daya dengan kecepatan 0,0097 m/s. Dari hasil pengujian untuk kecepatan pengaduk adalah 3 menit untuk berat tepung adalah 15 Kg dimana untuk kapasitas mesin pengaduk tepung ini adalah 300 Kg/jam. dengan adanya mesin pengaduk tepung tipe horizontal ini proses kerja pengadukan tepung semakin cepat dan produksi semakin banyak, dan diharapkan alat ini dapat digunakan dan dikembangkan untuk masyrakat usaha kecil menengah.

Kata kunci : Motor Induksi, Poros, Defleksi, Gaya, Dan Kecepatan Pulley.
ANALISA PANJANG OPTIMUM DESTILATOR SURYA TERHADAP KUANTITAS AIR HASIL DAN UNJUK KERJA DESTILATOR TENAGA SURYA.
Authors: Oktari Syafril , Saragih Sehat Abdi , Elfiano Eddy , Rosli Masli Irwan 
Published: December 2024

Teknologi destilasi (penyulingan) air untuk mendapatkan air tawar dari air kotor atau air laut intinya adalah menguapkan air laut dengan cara dipanaskan, yang kemudian uap air tersebut diembunkan sehingga menjadi air tawar. Proses kerja destilator terdapat juga kelemahan yaitu dari proses penguapan destilator, uap yang dihasilkan lalu diembunkan menjadi butiran air yang menempel dikaca. Selanjutnya butir air bertemu dengan butir-butiran air yang lainnya dan menghasilkan butir air yang memiliki berat air berlebih sehingga sebelum butir air tersebut sampai ke dalam penampungan, butir air tersebut akan terlebih dahulu jatuh. Begitu pula dengan semakin panjangnya destilator akan mempengaruhi penguapan jatuhnya butir air sebelum jatuh ke dalam penampungan. Penelitian ini bertujuan untuk mengetahui panjang optimum destilator tenaga surya. Penelitian ini menggunakan panjang optimum dari 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, dan 1000 mm sebagai panjang yang akan dianalisa. Proses penguapan tersebut akan mempengaruhi dari sistem destilasi dan kuantitas air yang dihasilkan. Dari hasil pengujian yang memiliki panjang optimum terhadap kuantitas air hasil yang terbanyak yaitu pada panjang 70 cm sebesar 1678 ml.
Hal ini disebabkan oleh air pada basin yang sudah diuapkan harus diembunkan (kondensasi) supaya uap jenuh tersebut melepaskan kalor laten agar menghasilkan kuantitas air hasil yang maksimal. Dari hasil pengujian dan perhitungan yang memiliki panjang optimum terhadap unjuk kerja terbaik pada destilator tenaga surya yaitu adalah panjang 70 cm, karena laju energi saat penguapan sebesar 127,6 Watt, laju energi saat pengembunan sebesar 124,02 Watt, laju destilasi dalam proses destilasi sebesar 0,0000517 kg/s, efesiensi produk destilasi sebesar 11,65%, dan efesiensi sistem destilasi sebesar 38,2%.
ANALISA KEKERASAN DAN STRUKTUR MIKRO PADA CORAN LOGAM ALUMINIUM BEKAS SEPATU REM (BRAKE SOE) DENGAN PENAMBAHAN UNSUR MANGAN (Mn)
Authors: Andika Roni Andika , Hastuti Kurnia , Syawaldi  
Published: December 2024

Saat ini pengecoran aluminium pada industri kecil banyak memanfaatkan bahan dasar aluminium bekas. Penelitian ini dilakukan dengan menggunakan bahan dasar aluminium bekas sepatu rem. Variasi penambahan mangan(Mn) dilakukan pada saat peleburan (remelting). Mangan ditambahkan dengan 3 komposisi berbeda yaitu 0,5%Wt, 1%Wt,dan 1,2%Wt. Material hasil remelting diuji kekerasan dan dilakukan pengamatan struktur mikro untuk mengetahui pengaruh penambahan mangan. Hasil penelitian menunjukan bahwa penambahan mangan hingga 1%Wt menurunkan kekerasan, namun penambahan kembali meningkatkan meningkat pada penambahan mangan 1,2%Wt. Pada material hasil remelting memperlihat kan adanya porositas yang di sebabkan oleh karena mangan tidak mengisi ruang-ruang kosong dalam struktur mikro.
SISTEM BIOGAS SEBAGAI ENERGI TERBARUKAN SKALA RUMAH TANGGA DENGAN MEMANFAATKAN LIMBAH KOTORAN BURUNG PUYUH
Authors: Elfiano Eddy , Fadhilah Muhammad Cendekia , Masdar Mohd Shahbudin 
Published: December 2024

Bioenergy development is very important as a source of energy supply in the future. One of the bioenergy that can be developed to be used in the household is biogas energy. Biogas production process through anaerobic degradation of organic materials such as livestock is one of the technological solutions to produce alternative energy. The objective of this study is to obtain a simple household biogas system design with quail manure waste material. The method used in this study is an experimental method by measuring differences in manometer height, biogas pressure, gas volume development, gas volume, biogas production, and flame test. This study used quail and water manure with a ratio of 1: 1 at a digester capacity of 0.121 m3. Data collection was carried out for 50 days. In this research, the household scale biogas system constructed of a fiber glass drum with 44 cm diameter and 80 cm height. The results show that pressure generated for 50 days is 104,895 N / m2, with the development of the volume of gas per day an average of 0.047 m3, the volume of biogas produced for 50 days is 1.82 m3, and produces a flame on the stove for 1 hour 36 minutes.
PEMANFAATAN LIMBAH SERAT POHON SAGU UNTUK PEMBUATAN KOMPOSIT
Authors: Syahputra Agus , Yulianto Dody 
Published: December 2024

PEMANFAATAN LIMBAH SERAT POHON SAGU UNTUK
PEMBUATAN BIO KOMPOSIT

Agus Syahputra dan Dody yulianto
Program Studi Teknik Mesin, Fakultas Teknik, Universitas Islam Riau
Jl. Kaharuddin Nasution No. 133 Perhentian Marpoyan, Pekanbaru
Email : putraa@student.uir.ac.id

ABSTRAK

Bio komposit adalah gabungan suatu bahan yang terdiri lebih dari dua bahan, dan digabungkan membentuk suatu bahan yang mempunyai sifat berbeda dengan bahan aslinya. Dengan melimpahnya serat sagu di Kabupaten Meranti, hal ini tentu dapat dimanfaatkan terutama di bagian kulit sagu yang sering dibuang dan menyebabkan limbah. Sehingga kulit ini dapat dipakai untuk pembuatan komposit, dengan menggabungkan serat kulit pohon sagu dengan resin polyester. Untuk mengetahui sifat mekanik maka diperlukan pengujian komposit terhadap kekuatan bending dan ketangguhan impact. Dengan variasi volume 80% resin + 20% serat, 70% resin + 30% serat dan 60% resin + 40% serat. Dengan harapan untuk mendapatkan komposisi yang tepat, dan meningkatkan kegunaan dari limbah pohon sagu, untuk menjadi material yang baru. Tahapan ini dimulai dengan pemilihan serat, dan pencampuran resin polyester. Pembuatan spesimen dan prosedur pengujian mengacu pada, ASTM D790 untuk Bending dan ASTM D6110 untuk Impact. Hasil dari pengujian impact dan bending menunjukan kekuatan dari uji bending terbesar adalah 22,39 N/mm2, untuk fraksi volume 60% resin + 40% serat. Sedangkan kekuatan terendah untuk uji bending adalah 8,85 N/mm2, untuk fraksi volume 80% + 20%. Dan ketangguhan impact terbesar adalah 47,173 J untuk fraksi volume 60% resin + 40% serat, sedangkan kekuatan impact terendah adalah 37,674 J, untuk fraksi volume 80% resin + 20% serat. Dapat disimpulkan jika di spesimen fraksi seratnya besar, maka akan memiliki kekuatan dan ketangguhan spesimen yang lebih baik.

Kata kunci : Komposit, Serat, material, kekuatan Bending, polyester