bluuebunny/crossref_metadata_2025 huggingface dataset:
An insight into digital twin behavior of vehicular ad hoc network for real-time cloud security and monitoring
Authors: Lakshmi Narayanan K. , Naresh R.
Published: October 2023

Vehicular Ad-Hoc Network (VANET) Technology is advancing due to the convergence of VANET and cloud computing technologies, Vehicular Ad-Hoc Network (VANET) entities can benefit from the cloud service provider’s favourable storage and computing capabilities. Cloud computing, the processing and storage capabilities provided by various cloud service providers, would be available to all VANET enterprises. Digital Twin helps in creating a digital view of the Vehicle. It focuses on the physical behaviour of the Vehicle as well as the software it alerts when it finds issues with the performance. The representation of the Vehicle is created using intelligent sensors, which are in OBU of VANET that help collect info from the product. The author introduces the Cloud-based three-layer key management for VANET in this study. Because VANET connections can abruptly change, critical negotiation verification must be completed quickly and with minimal bandwidth. When the Vehicles are in movement, we confront the difficulty in timely methods, network stability, and routing concerns like reliability and scalability. We must additionally address issues such as fair network access, inappropriate behaviour identification, cancellation, the authentication process, confidentiality, and vehicle trustworthiness verification. The proposed All-Wheel Control (AWC) method in this study may improve the safety and efficiency of VANETs. This technology would also benefit future intelligent transportation systems. The Rivest–Shamir–Adleman (RSA) algorithm and Chinese Remainder Theorem algorithms generate keys at the group, subgroup, and node levels. The proposed method produces better results than the previous methods.
Digital UAE - a platform for demographic processes management
Authors: Jie Wu , Bakhtizin Albert R. , Zili Wu , Nafisa Bakhtizina , Timur Bakhtizin
Published: October 2023

This paper analyzes the existing demographic situation in the UAE, reveals current trends and main problems in this area. Successful foreign experience in solving demographic problems is also considered herein. Scenarios for the country were developed on its basis taking into account UAE state priorities. The paper describes the developed Digital UAE model, which allows carrying out scenario calculations to manage demographic processes in the UAE. Digital UAE was created on Tianhe-2 supercomputer (China) using an agent-based approach. With the help of Digital UAE, a forecast of the country's population was obtained within the framework of several scenarios: inertial, disurbanization, migration policy toughening, granting preferences to women, and an increase in health care costs. The developed tool can also be used to solve other related tasks to manage the socio-economic development of the UAE.
Eficácia de herbicidas aplicados em trapoeraba (Commelina benghalensis) na região oeste do Estado do Paraná
Authors: Moreira Perissato Matheus , Paiola Albrecht Alfredo Junior , Paiola Albrecht Leandro , Bosquette Rosa Willian , Moreira Perissato Samara , Larini Willian Felipe
Published: October 2023

A trapoeraba (Commelina spp.) é considerada um gênero tolerante ao glyphosate, apresentando controle reduzido a esse herbicida em estádios avançados. Assim, o objetivo do trabalho foi avaliar a eficácia de controle das associações de glyphosate com herbicidas de diferentes mecanismos de ação em Commelina benghalensis. O experimento foi conduzido, após a colheita do milho safrinha em 2018, em Palotina-PR. O delineamento experimental foi de blocos casualizados com 12 tratamentos (Testemunha, glyphosate + 2,4-D, glyphosate + 2,4-D (aminol 806), glyphosate + dicamba, saflufenacil + glyphosate, glyphosate + dicamba + saflufenacil, diclosulam + glyphosate + saflufenacil, glyphosate + dicamba + chlorimuron, glyphosate + dicamba + glufosinato, glyphosate + dicamba + diclosula, glyphosate + dicamba + (sulfentrazona + diuron) e glyphosate + dicamba + (imazetapir + flumioxazina) e 4 repetições. O controle de C. benghalensis foi avaliado por notas visuais aos 7, 14, 21 e 28 dias após a aplicação (DAA) e por meio da massa seca aos 28 DAA. Independente do tratamento, aos 7 DAA não houve controle eficaz. As notas foram crescentes ao longo do tempo, sendo que aos 28 DAA, os tratamentos glyphosate + 2,4-D para ambas as doses (1025+975 e 1080+1005); diclosulam + glyphosate + saflufenacil; glyphosate + dicamba + diclosulam e glyphosate + dicamba + (imazetapir + flumioxazina) foram os mais eficazes no controle e redução de massa seca, indicando ser potenciais associações no controle da trapoeraba.
4-H Archery Leader Guide: Basic and Advanced Levels, Ages 8–18 Years
Authors: Kelly Julia S. , Benge Matt , Israel Glenn
Published: October 2023

The purpose of this guide is to provide a resource for archery leaders that includes reflection, application and evaluation with the activities. Written by Julia S. Kelly, and published by the Florida 4-H Youth Development Program, UF/IFAS Extension, June 2023.
Florida 4-H Exploration: Careers in Horticulture
Authors: Beckford Marguerite , Davis Sarah , Popa Kristie , Ward Marnie
Published: October 2023

This publication highlights some of the many career pathways in horticulture. 4-H youth and 4-H club leaders can use the document to explore potential career interests. Written by Marguerite Beckford, Sarah Davis, Kristie Popa, and Marnie Ward, and published by the Florida 4-H Youth Development Program, UF/IFAS Extension, September 2023.
Awareness and Intelligence with Emotions
Authors: Janney Heather M. , Gonzalez Daniel
Published: October 2023

Emotions are part of every human being. There are hundreds of emotions along with variations, mutations, and blends of those emotions. They tell us about what we are experiencing and help us to know how to react. There are no good or bad emotions, but there are good and bad ways of expressing (or acting on) emotions. In working with youth, who have the least experience dealing with their emotions, adults must pay special attention to their interactions with youth. It is like building a pyramid with cups: any small action or interaction can make things tumble downward. As extension professionals and 4-H volunteers working directly with youth, we can see these pyramids in the process of building up and tumbling down, and we also have the ability to use the skills of emotional awareness and emotional intelligence to help deter again the potential negative impacts of youth breaking down with their emotions.
Criando gallinas ponedoras en el patio
Authors: Henry Mary E. , Ryals Jessica , Halbritter Alicia N. , Barber Derek L. , Bosques Jonael , Rivera Francisco P.
Published: October 2023

Los recursos informativos para vender huevos o producir a gran escala también son provistos en esta publicación. Este documento es el AN239-Span, uno de una serie del Departamento de Ciencias Animales, UF/IFAS Extension. Publicación original de septiembre de 2023.
Market opportunities for Florida farmed oysters
Authors: Botta Robert , Garlock Taryn , Camp Edward V. , Ropicki Andrew , Asche Frank
Published: October 2023

The oyster aquaculture industry has grown quickly in recent years. New farming techniques target specific attributes that increase oysters' value and allow them to be sold in the high-value, half-shell market. A lack of economic data makes it difficult for growers to determine which specific attributes increase oyster value, however. This publication summarizes findings from a recent study that examined restaurant menus to obtain economic data on raw, half-shell oysters. Major findings indicate that brand is an oyster attribute that provides value, and that marketing oysters with information on two or more attributes can also result in higher prices. Additionally, locally sourced oysters are often sold at cheaper prices, providing an opportunity for growers from outside regions to enter new markets. The findings will be useful to Florida oyster growers as attempts to expand Florida’s oyster aquaculture industry continue.
In vitro and in vivo antifungal activity of extracts from Jamaica cherry Muntingia calabura l. leaves
Authors:   Faculty of Chemical Engineering and Food Technology, Nong Lam University, Vietnam, Nguyen Nguyen Hoang Phuc , Hoang Binh Quang ,   Faculty of Chemical Engineering and Food Technology, Nong Lam University, Vietnam, Trinh Ngoc Thao Ngan ,   Faculty of Chemical Engineering and Food Technology, Nong Lam University, Vietnam; Faculty of Bioscience Engineering, Ghent University, Belgium, Raes Katleen ,   Faculty of Bioscience Engineering, Ghent University, Belgium, Le Trung Thien ,   Faculty of Chemical Engineering and Food Technology, Nong Lam University, Vietnam
Published: October 2023

Previous studies on M. calabura (Jamaica cherry) leaves reported the presence of polyphenols, flavonoids, glycosides, and tannins. However, the deep research focus on the antifungal activity of Jamaica cherry leaf extract (JCLE) is still limited. Hence, the current study was conducted on JCLE samples by using various solvents, i.e., 70% ethanol, 70% methanol, and 70% acetone, and then evaluating their antifungal activity. Analytical results showed that JCLE could be used as a natural antifungal potential agent against mold-causing spoilage in fruits. Specifically, the ethanolic extract had a strong inhibition of Colletotrichum gloeosporioides and Lasiodiplodia theobromae. While the methanolic and acetonic extracts prevented sharply the growth of Alternaria alternata and Fusarium equiseti, respectively. Generally, the ethanolic extract was able to inhibit the various mold strains better than the other solvents. Furthermore, the results showed that the percentage inhibition of radial growth (PIRG) of JCLE increased gradually as the concentration increased from 4000 to 40000 mg GAE/kg. The highest data obtained for C. gloeosporioides, A. alternata, F. equiseti, and L. theobromae were 53.29%, 57.03%, 54.81%, and 75.03%, respectively. In vivo experiment, the samples were treated with and without JCLE (the control sample) occuring the black spots caused by C. gloeosporioides on mango’s surface after 21 days and 30 days of storage at 12 ± 2 °C, respectively. Whereas the TSS and TA values of both samples were similar. While the visual appearance of the control was more yellow compared to the samples treated with JCLE. In conclusion, JCLE was able to significantly delay the development of pathogenic mold, though it quite inhibited the maturation of mango fruit. Further studies may be needed to evaluate the phtychemical profile of M. calabura extract to gain a deeper understanding of its antifugal activity.
PENGARUH KETELADANAN GURU AKIDAH AKHLAK TERHADAP PEMBENTUKAN KARAKTER SISWA
Authors: Wibowo Mas Teguh , OK Azizah Hanum
Published: October 2023

In the context of concerns about teacher behaviour that does not motivate students, such as shouting at students, frequent teacher tardiness, or coldness in interactions with students, this study focuses on the impact of teacher exemplary behaviour on student character building at Mts Swasta Darul Ulum Budi Agung Medan. This study used a quantitative method with a descriptive correlational approach, including Pearson product moment correlation analysis and simple linear regression test. The results confirmed that teachers' exemplary behaviour in the aspects of creed and morals has a significant influence on students' character development, with a strong correlation level. The simple linear regression test shows that the exemplary behaviour of teachers in this case makes a positive contribution of 37.81% to student character. The validity and reliability of the research instruments have been well tested. These findings, reinforced by data analysis using SPSS version 20 software, emphasise the important role of teacher exemplarity in shaping student character in this educational institution, and encourage efforts to improve teacher exemplarity as a positive step to effectively shape student character.
Assessing the Effects of the COVID-19 Pandemic on the Aviation Sector and Exploring Strategies for Industry Recovery
Authors: Roba Hasaneya , Khadija Mohammed , Swathi Shankar , Ignatius Fernando , Chaitanya Sonambekar , Nikita Garg
Published: October 2023

One of the most impacted industries among all, is the Airlines industry. Airlines need to study the consequences of a pandemic, what is important is that they adapt to the uncertainty and complex changes. Companies must understand how to manage their capabilities, strategy, mission, and vision, with a fast and changing environment. Each airline can get the benefit of having a low-cost strategy and use the cargo shipment strategy that makes it easy to ship different products. Basically, reaching efficiency and effectiveness to lead the uncertain changes. For the research report it considers the highly affected industry in covid era. Qatar airways operated in a high premium business model but in covid times, demand of the luxury segment got affected. Indigo does their business mainly in India, so they are the worst hit in these times since India shows the second highest number of covid cases in the world. Due to the resurgence of Covid-19, Cathay Pacific have struggled with staff rostering due to Hong Kong’s strict quarantine rules.
How Service Quality Influence Customer Satisfaction: A Case Study of Starbucks in Malaysia
Authors: Yahui Luo , Shiwen Chen , Binti Ahmad Anis Nur Shafinaz , Guodong Sun , Yuanhao Guan , Hung Daisy Kee Mui , A. Azmi N.
Published: October 2023

The purpose of this study is to examine how service quality in Starbucks influences customer satisfaction and loyalty towards Starbucks coffee products. Services usually related to the food and beverages industry, mainly cafes and restaurants. The quality of service provided by café services is an idea that is always used by customers in evaluating the quality of that café, and quality and taste of the food or beverages. The services provided by the company throughout the years have always called attention to the public as consumers. The respondents for this case study are the customers of Starbucks Malaysia. This report reveals the relationship between types of service quality of Starbucks and how customers get satisfied by it. From this study, it was found that the quality of service has a huge impact on customer satisfaction which most customers prefer a high-quality service. High quality service will increase customer loyalty. Besides that, high satisfaction increases customer loyalty which indicates satisfied customers definitely affect the loyalty of customers. It is suggested that the attitude of employees should be managed and trained well. For the management department, the supervision and evaluation of catering service quality and after-sales work must be strengthened.
PENENTUAN SIFAT TEKNIS TANAH JENUH SEBAGIAN DAN ANALISIS DEFORMASI LERENG AKIBAT PENGARUH VARIASI HUJAN
Authors: PRAMUSANDI Sony , RIFA’I Ahmad , SURYOLELONO Kabul Basah
Published: October 2023

Abstract

Recently, landslides often occurs in natural slope in Indonesia, which is associated with the coming rainy season . The increment of ground water level cause by rainfall is affected the properties and behavior of soil especially the unsaturated soil. Generally, the stability of slope is evaluated based on safety factor, but the deformation occured at the soil can also be a good interest in assesing the stability of slope. This research is focused to observe the change of pore water pressure and ascoociate deformation considering the hydro-mechanical properties of unsaturated soil due to the effect of varies rainfall. In this research, numerical simulation was carried out to analysis the deformation of the slope affected by pore water pressure change due to rainfall using software-based Finite Element Method of SIGMA/W and SEEP/W from GEO-SLOPE 2004. Unsaturated soil properties, such as Soil Water Characteristic Curve (SWCC) and Hydraulic Conductivity function are obtained from laboratory test and also predicted based on grain-size distribution using psycho-empirical method in SOILVISION Database. HAVARA is used to help rainfall data analysis using statistic approach. Rainfall model is used to vary the moisture content to model unsaturated soil condition. There are six rainfall models, consists of one steady state model and followed by five transient model to accomodate the pore water pressure changes due to rainfall. The results show that rainfall with intensity near saturated permeability of soil gives more significant influence in increasing pore water pressure and deformation than normal rainfall even with long duration. Proposed countermeasure by providing counterweight and subdrain do not significantly effect the deformation, but it could improves the safety factor significantly, so that the slope is more in stable condition.

Keywords : landslide, unsaturated soil properties, pore water pressure, slope deformation, numerical simulation, finite element method, countermeasures.
Studi Potensi Limbah Debu Pengolahan Baja (Dry Dust Collector) sebagai Bahan Tambah pada Beton
Authors: Amalia Amalia
Published: October 2023

Abstract

This research has the objectives of finding out the concrete properties, which are, workability, unit weight, compressive strength, flexural strength and finding out an optimum composition of dry dust collector waste in the concrete mixture.

In this research, 3 different kinds of concrete mixture were created based on the amount of waste substitution in the concrete. The examined concrete mixture compositions were the concrete with water cement ratio = 0.68, with the waste substitution as much as 0%, 10%, and 20% of sand weight. The mechanical behavior of the concrete was tested at the age of 28 days.The research results show that, an addition of dry dust collector waste in the concrete influence concrete workability, unit weight of concrete with 10 % waste as much as 2497,44 kg/m3. The concrete with 10 % waste had the higher unit weight compare with the normal concrete without waste. The dry dust collector waste substitution as much as 10% in the concrete can improve compressive strength and flexural strength concrete. The compressive strength of the concrete increases as much as 21.21%, flexural strength of the concrete increases as much as 3.48%.

Keywords: concrete, dry dust collector waste, compressive strength, flexural strength
IDENTIFIKASI Dan PENANGANAN RISIKO K3 PADA PROYEK KONSTRUKSI GEDUNG
Authors: Sucita I Ketut , Broto Agung Budi
Published: October 2023

Abstrak

Pekerja konstruksi menghadapi bahaya kerja 2 - 4 kali lebih tinggi dibandingkan dengan pekerja-pekerja lain pada umumnya. Laporan Global Estimates Fatalities in 2002, Organisasi Perburuhan Internasional (ILO) menyatakan bahwa Standar Keselamatan Kerja di Indonesia paling buruk dibandingkan dengan Negara-negara di kawasan Asia Tenggara lainnya. Penelitian ini bertujuan untuk membuat suatu perencanaan program K3 yang detail dan komprehensif sebagai upaya mencapai keperhasilan proyek khususnya dari aspek Keselamatan dan Kesehatan Kerja (K3). Untuk membuat perencanaan program K3, maka dalam penelitian ini akan dilakukan beberapa tahapan yaitu (1) mengidentifikasi risiko-risiko kecelakaan kerja pada setiap tahapan pelaksanaan proyek pembangunan gedung (2) menganalisa dan mengukur risiko-risiko kecelakaan kerja yang terjadi sehingga bisa diketahui besarnya risiko pada pembangunan gedung dan (3) Membuat bentuk-bentuk penanganan/penanggulangan dari masing-masing tingkatan risiko kecelakaan kerja pada pembangunan gedung. Objek penelitan adalah proyek pembangunan gedung Centro City Residence. Hasil identifikasi bahaya pada kegiatan proyek pembangunan Centro City Residences meliputi 33 kegiatan dengan 118 potensi bahaya/risiko kecelakaan kerja. Sedangkan penilaian/ pengukuran bahaya/ risiko dikelompokkan menjadi 3 kategori/level risiko yaitu Risiko rendah/ Low risk (L), Risiko sedang/ Medium risk (M), Risiko tinggi/ High risk (H). Berdasarkan identifikasi dan pengukuran resiko tersebut kemudian dibuat pengendalian risiko. Sebanyak 300 bentuk pengendalian berhasil di buat untuk menanggulangi risiko-risko yang ada.

Kata Kunci: identifikasi, pengukuran, penanggulangan, risiko kegiatan proyek konstruksi.
TINJAUAN VARIASI TEBAL GROUTING SIKADUR® 31 CF NORMAL Dan PANJANG PENYALURAN TERHADAP DAYA LEKAT BAJA TULANGAN PADA BETON MUTU NORMAL
Authors: Rosyidah Anis , Maulid R Gilang , Yasin Efendi
Published: October 2023

Abstract

One of the requirements in reinforced concrete structures is the existence of bonding between reinforcement and concrete, so that if the concrete structure of the given load will not slip between reinforcing steel and concrete, with a condition for disbursement length and diameter sufficient reinforcement. This research was conducted with laboratory experimental methods, this study used threaded steel bars 10 mm in diameter grown on cylindrical concrete specimens with a length variation of normal quality distribution of 100 mm and 200 mm, and for thickness variation Sikadur® 31 CF Normal used a thickness variation mm, 2 mm, 3 mm. Each specimen is tested with a method of "bond, a pull-out test". Based on the results obtained from voltage variations thick adhesive Sikadur® 31 CF Normal, with thick sticky voltage Sikadur®31 CF Normal 2 mm produces voltage optimium closely with the value of 8.412 MPa,the adhesive stresses are found for the distribution of the required length of 182.860 mm for thickness variation Sikadur® 31 CF Normal 1 mm, 97.586 mm for thickness variation Sikadur® 31 CF Normal 2 mm, while for thickness variation Sikadur® 31 CF Normal 3 mm can not be calculated and analyzed the test results because of the "bond, a pull-out" no reinforcing steelreaches the yield condition, caused by broken concrete and reinforcing steel cylinder apart before reaching the yield condition. Then the length distribution obtained by the above formula Park & Paulay compared with the length distribution of article 14.2 of SNI 30-2847-2002 obtained epoxy ratio of 2:13 for the thickness of 2 mm with a planting of 100 mm. In the epoxy thickness 1 mm with 200 mm obtained planting 2:7 ratio, and the planting of monoliths obtained 2:5 ratio. Bold use of Sikadur® 31 CF Normal apparently affect the pattern of damage to the concrete and steel. When planting steel bars are too short we need a thicker epoxy, planting reinforcement 100 mm with a thickness of 3 mm epoxy. When planting longer needed a thinner epoxy, the planting of 200 mm reinforced epoxy with a thickness of 1 mm. Based on the pattern of damage that occurs, the thickness of epoxy should consider the quality of concrete used to prevent the destruction of the concrete.

Keyword: grouting thickness, development length, bond stress.
RANCANGAN HETEROJUNCTION BIPOLAR TRANSISTOR SILIKON GERMANIUM (HBT’S SIGE) DENGAN PENDEKATAN POISSON EQUATION
Authors: Alamsyah Tossin , Saepuddin Endang
Published: October 2023

Ideally performance of Heterojunction Bipolar Transistor (SiGe HBT's) is the Threshold Frequency (ft) and Maximum Frequency (fmax) and high current gain. In order to get the performance can be used the physics approach that that is heavy doping on the emitter and narrow base width. This research conducted at the design of SiGe HBT's based on a model approach three (3)-dimensional hydrodynamic approach to the Poisson equation with electron transport. Simulation using the software Bipole3 with input parameters based on models developed by IBM's first generation. Results of analysis and discussion show that the design of SiGe HBT's provide the frequency threshold (FT) 56 GHz with a deviation of 7% of the worth of a model developed by IBM.

Keywords: HBT’s SiGe, Poisson Equation.

ABSTRAK

Kinerja ideal dari Heterojunction Bipolar Transistor (HBT’s SiGe) adalah Threshold Frequency ( ft ) dan Maximum Frequency ( fmax ) serta Current Gain yang tinggi. Untuk mendapatkan unjuk kerja yang tersebut dapat digunakan pendekatan physic yaitu heavy doping pada emitter dan lebar basis dibuat sempit (narrow base width). Pada riset ini dilakukan rancangan HBT’s SiGe berdasarkan pendekatan model tiga(3) dimensi hydrodynamic dengan pendekatan Poisson equation electron transport. Simulasi menggunakan perangkat lunak Bipole3 dengan parameter masukan berdasarkan model yang dikembangkan oleh IBM generasi pertama Hasil analisa dan pembahasan menunjukkan bahwa hasil rancangan HBT’s SiGe menghasilkan frekuensi threshold (fT) 56 GHz dengan deviasi senilai 7% terhadap model yang dikembangkan oleh IBM.

Kata kunci: HBT’s SiGe, Persamaan Poisson
RANCANG BANGUN MIKROSTRIP COUPLER UNTUK MOBILE WiMAX PADA FREKUENSI 2,3 GHz
Authors: Zulhelman Zulhelman , Wagyana Agus , Firmansyah Teguh
Published: October 2023

The function of the coupler in RF WiMAX is to separate the transmitted signal to the received signal. At the branch line couplerthere are two equal output values with the phase difference of 90°. The phase difference is used as the separator between the transmitter and the receiver. In this paper, a microstripbranch line couplerwith a T-junction will be designed which is operated at 2,3 GHz frequency with two equal output values of - 3dB and 90 ° phase differences. In here also the length and width for each impedance line of the microstripbranch line coupler using FR4 substrate with a dielectric constant of 4,6 and a thickness of 1,6 mm are calculated. It is shown from the results that the microstripbranch line coupleroperates at 2,300 GHz, the return loss is - 27.633 dB, the VSWR is 1,060, and the bandwidth is 200 MHz. And it is shown from the measurement microstrip branch line coupler operates at 2,320 GHz, the return loss is - 24.33 dB, the VSWR is 1,120, and the bandwidth is 210 MHz.

Key words :Coupler, Microtrip, Mobile WiMax

ABSTRAK

Fungsi coupler pada RF WiMAX dirancang sebagai pemisah sinyalyang ditransmisikan dengan yang diterima. Pada branch line coupler terdapat dua output yang bernilai sama besar dengan beda fasa sebesar 90°. Perbedaan fasa inilah yang digunakan sebagai pemisah antara transmitter dengan receiver. Pada penelitian ini dirancang microstrip branch line coupler dengan T-junction yang bekerja pada frekuensi 2,3 GHz dengan nilai kedua ouput sebesar – 3 dB dan beda fasa 90°.

Tahapan yang dilakukan adalah merancang panjang dan lebar untuk setiap saluran impedansi pada microstrip branch line coupler dengan menggunakan substrat FR4 yang memiliki konstanta dielektrik sebesar 4,4 dengan ketebalan 1,6 mm. Dari hasil perancangan didapat frekuensi kerja dari microstrip branch line coupler adalah 2,300 GHz, besarnya return loss adalah -27,633 dB, VSWR sebesar 1,060, dan bandwidth sebesar 200MHz. Hasil yang dirancang di pabrikasi dan dilakukan pengukuran. Dari hasil pengukuran didapat frekuensi kerja dari microstrip branch line coupler adalah 2,320 GHz, besarnya return loss adalah -24,33 dB, VSWR sebesar 1,120, dan bandwidth sebesar 210 MHz.

Kata kunci : Coupler, Microtrip, Mobile WiMax
PENGARUH WAKTU PENGERINGAN TERHADAP KADAR AIR GABAH PADA MESIN PENGERING GABAH KONTINYU KAPASITAS 100 KG DAN DAYA 1890 W
Authors: Mustofa K. D
Published: October 2023

The traditional way of long drying time for drying grain is drying under the sun. Since the weather conditions that can not be controlled need to designed the Continuous Grain Dryer to dry the grain that does not depend on weather conditions. This designed dryer uses heater to improve air temperature which hot air is exhaled by force using a fan to the tube extruder. Extruder is functioning to move grain the initial entry to exit, extruder was driven continuously by a motor with rotational speed 1400 [rpm].

From this research can be concluded that the drying time effect on grain moisture content linearly. The longer the drying time the lower the moisture content of grain. In this study, the processing time or drying time is used to dry wet grain as much as 60 kg with a moisture content of 27% to 14% is 4 hours 56 minutes.Listen

Keyword: Grain, Dryer

Abstrak

Cara tradisional dalam pengeringan gabah adalah penjemuran dibawah sinar matahari. Kelemahanya adalah waktu pengeringan relatif lama dan kondisi cuaca yang tidak dapat dikendalikan.

Rancang bangun Mesin Pengering Gabah kontinyu merupakan alternatif untuk mengeringkan gabah yang tidak bergantung kondisi cuaca. Alat ini menggunakan Heater yang berfungsi memanaskan udara yang kemudian udara panas tersebut dihembuskan secara paksa menggunakan Kipas menuju tabung Ekstruder. Ekstruder berfungsi mengalirkan gabah dari awal masuk sampai keluar dari tabung, Ekstruder tersebut digerakkan oleh motor dengan kecepatan putar 1400 [rpm] dan beroperasi secara kontinyu.

Dari penelitian ini dapat disimpulkan bahwa waktu pengeringan berpengaruh terhadap kadar air gabah secara linier. Semakin lama waktu pengeringan maka semakin rendah kadar air gabah. Pada penelitian ini waktu proses atau waktu pengeringan yang digunakan untuk mengeringkan gabah basah sebanyak 60 kg dengan kadar air 27 % menjadi 14 % adalah 4 jam 56 menit.

Kata Kunci : Gabah, Mesin Pengering
PERANCANGAN SISTEM PERINGATAN DINI UNTUK PERAWATAN MESIN DI INDUSTRI SEMEN
Authors: Mulyono R. Sugeng
Published: October 2023

Early Warning System for Maintaining the Machine in Cement Industry, is an application which is designed for being applied on management system for maintaining machine in a cement industry. By using this application could be gained an accurate information as early warning that a machine has to be periodically maintained. The information as an out put of the application will be sent 3 days before maintaining process executed. By this system the maintenance operator can be properly warned, so can be reduce posibilities the machine getting damage because of careless factor. Also could be expected that productivity will be increased as well as reduce overhead–cost for maintenance. This early warning system is designed by applying database principles, and by combining the Unified Modeling Language, Zachman Framework concept as well as using Graphical User Interface will be produed an application named by SIsPeD which be divided into 7 scenarios i.e. Login Admin, Login User, Setting User ID and Password, Change Password, Entry Data Resource, Edit Data Resource and View Data EWS. From the design application after coding process will be created early warning for maintaining the machine which operated by client-server concept in the intranet net-work.

Key-words Machine, Periodical Maintenance, Early Warning System.

ABSTRAK Sistem Peringatan Dini Perawatan Mesin Di Industri Semen, merupakan sebuah aplikasi yang dirancang untuk diterapkan pada sistem manajemen perawatan mesin di suatu industri semen. Dengan menggunakan aplikasi ini dapat diperoleh informasi yang akurat berupa peringatan dini (early warning) bahwa suatu mesin sudah waktunya untuk dilakukan perawatan berkala. Informasi sebagai output dari aplikasi ini diberikan 3 hari sebelum proses perawatan dilakukan. Dengan sistem ini diharapkan dapat membantu mengingatkan operator perawatan mesin, sehingga dapat mengurangi kemungkinan kerusakan suatu mesin akibat kelalaian melakukan proses perawatan. Dengan sistem ini juga diharapkan dapat meningkatkan produktifitas mesin serta mengurangi biaya yang tidak seharusnya dikeluarkan akibat kelalaian perawatan. Sistem Peringatan Dini ini dirancang dengan menerapkan prinsip-prinsip perancangan database, dan menggabungkan dengan metode Unified Modeling Language, konsep Kerangka Zachman serta menggunakan aplikasi Graphical User Interface akan dihasilkan suatu rancangan aplikasi yang diberi nama SIsPeD yang simulasi operasinya dibagi ke dalam 7 skenario yaitu Login Admin, Login User, Setting User ID dan Password, Mengganti Password, Menambah Data Resource, Mengedit Data Resource, dan Melihat Data EWS. Dari rancangan aplikasi ini setelah melalui proses coding akan dihasilkan peringatan dini perawatan mesin yang dijalankan dengan konsep client-server pada jaringan Intranet.

Kata kunci : Mesin, Perawatan Berkala, Sistem Peringatan Dini
LABORATORIUM PENGKONVERSI GAMBAR STRUKTUR MIKRO DARI MIKROSKOP KE KOMPUTER SEBAGAI SARANA PRAKTIKUM METALOGRAFI
Authors: Widjatmaka1, Tri , Prasetya Sonki
Published: October 2023

Practical activities in mechanical engineering laboratory requires adequate facilities and infrastructure. There are several obstacles to implement metallographic laboaratory. One of obstacles is the lack of equipment microstructure image viewer that can be documented for analysis. The activities of metallographic laboratory are unsatisfactory. To answer these problems, this study provides a solution to design and make equipment can document the image of the metallographic microstructure. In principle, the design and manufacture of this equipment is to change the video signal of microscop image of microstructure sensed by the camera into a digital signal by the video card device. Motor with the adjuster is used to set the microscope focus. The image of microstructure can be observed, stored in a storage media (hard disc/flash disc/CD), and can be printed. The results of this study showed that the converter equipment of microstructures of the microscope image to the computer has successfully been designed and fabricated. The image obtained is better in quality and texture. Microstructures analysis can be easier and reduces analytical error. The image of microstructures can be stored, processed, transferred and printed properly. Using the motor adjuster to set the focus of the microscope improves work efficiency.

Key words: metallographic, microstructure, metallurgical-microscope.

ABSTRAK

Selama ini pelaksanaan praktikum, khususnya praktikum metalografi dihadapkan pada kendala, terutama kendala peralatan untuk penampilan gambar yang dapat didokumentasikan untuk keperluan analisis. Untuk menjawab permasalahan tersebut, penelitian ini memberikan solusi, yaitu dengan merancang dan membuat peralatan yang dapat mendokumentasikan gambar struktur mikro dari hasil proses metalografi. Pada prinsipnya, peralatan yang dirancang dan dibuat adalah bahwa spesimen yang diteliti melalui mikroskop akan diindera oleh kamera, dirubah sinyalnya dari sinyal video menjadi sinyal digital dengan piranti video card. Sedangkan pengaturan fokus digunakan motor penggerak yang dikopling dengan adjuster pada mikroskop. Dengan peralatan tersebut, gambar struktur mikro dapat diamati dan diolah langsung, disimpan dalam media penyimpan (hard disk/flash disk/CD), maupun dapat dicetak dengan menggunakan printer. Hasil dari penelitian ini menujukkan bahwa dengan peralatan pengkonversi gambar struktur mikro dari mikroskop ke komputer yang telah berhasil dirancang dan dibuat, gambar struktur mikro lebih baik dalam kualitas gambar maupun teksturnya. Hal ini akan lebih memudahkan untuk analisis dan mengurangi kesalahan analisis. Gambar struktur mikro juga dapat disimpan, diolah, ditransfer dan dicetak dengan baik menggunakan printer yang sudah disiapkan. Penggunaan motor dalam proses pengaturan fokus mikroskop gambar juga mempermudah operator dalam proses pengambilan gambar, yang berarti lebih meningkatkan efisiensi kerja.

Kata kunci :metalografi, struktur mikro, mikroskop metalurgi.
PROSES PRODUKSI PRODUK WAJAN BAHAN PLAT BAJA KARBON DENGAN METODE SPINNING
Authors: Husodo, Nur , Luwar Sanyoto, Budi , Widiyono, Eddy , ME Soedjono Denny
Published: October 2023

The process of metal spinning is the process of forming sheet metal with a combination of rotary motion and compression force to produce the products according shape mandril. This spinning process has the potential to be applied to small industries producing pan. Because it is necessary for application of the spinning process to form a pan products. Pans that will be realized based carbon steel plate with a shape like a teflon pan. Circular steel plate was placed in front of the mandrill and was gripped by the clamping components assisted by clamping the magnet system. Combination of rotary motion and compression force of the roll will cause the deformation of carbon steel to produce a product. Experiments performed with materials of carbon steel with a thickness of 0.8 mm and 1mm. In conclusion, the calculation of forces on the formation of carbon steel plate with a thickness of 0.8 mm is 14.722 kgf or 144, 277 N, with a thickness of 1 mm of 18.402 kgf or 180, 339 N. The existence of magnetic components will greatly assist the process of clamping plate material so the process of formation by the method of spinning operations become easier in operation.

Keywords : pan, spinning process, mandrill, magnetic.

ABSTRAK

Proses metal spinning adalah proses pembentukan lembaran logam dengan kombinasi gerak putar dan gaya tekan sehingga menghasilkan produk sesuai bentuk mandril. Proses spinning ini sangat berpotensi untuk dapat diterapkan pada industri kecil yang memproduksi produk wajan. Karena itu perlu dilakukan penerapan proses spinning untuk membentuk produk wajan. Wajan yang akan diwujudkan berbahan plat baja karbon dengan bentuk seperti wajan teflon. Plat baja berbentuk lingkaran ditempatkan di depan mandrill dan dicekam dengan komponen clamping dibantu dengan pencekaman dengan system magnit. Kombinasi gerak putar dan gaya tekan dari roll akan menyebabkan deformasi baja karbon sehingga dihasilkan produk. Percobaan dilakukan dengan bahan baja karbon dengan ketebalan 0,8 mm dan 1mm. Kesimpulannya, perhitungan gaya pembentukan pada plat baja karbon dengan tebal 0,8 mm adalah 14,722 Kgf atau 144, 277 N, dengan tebal 1 mm sebesar 18,402 kgf atau 180, 339 N. Adanya komponen magnet akan sangat membantu proses pencekaman bahan plat sehingga proses operasional pembentukan dengan metode spinning menjadi lebih mudah dalam operasional.

Kata kunci: wajan, proses spinning, mandill, magnet.
PEMANFAATAN LIMBAH DEBU PELEBURAN BIJIH BESI (DEBU SPONS) SEBAGAI PENGGANTI SEBAGIAN SEMEN PADA MORTAR
Authors: Amalia Amalia , BB Agung
Published: October 2023

Penelitian ini bertujuan untuk meneliti sifat-sifat mortar yang menggunakan limbah debu spons sebagai pengganti semen. Adukan dibuat dengan komposisi 1 PC : 3 pasir dengan 11 variasi perlakuan, yaitu jumlah debu spons yang mengganti semen dengan variasi jumlah debu 0% sampai 50% dari berat semen dengan interval 5%.

Hasil penelitian menunjukkan bahwa (1) Untuk membuat adukan yang mempunyai workability yang baik dan plastis, adukan yang menggunakan debu spons sebagai pengganti semen 5 % sampai 50 % membutuhkan jumlah air sebesar 67 % - 70 % dari berat semen. Penggunaan limbah debu spons sebagai pengganti semen sebesar 5 % sampai dengan 50 % membuat adukan lebih plastis dan mempunyai workability yang lebih baik dibandingkan dengan adukan tanpa limbah. (2) Berat isi adukan berkisar antara 2,217 gr/cm3 – 2,353 gr/cm3. (3) Adukan yang menggunakan debu spons mempunyai kekekalan bentuk yang lebih baik dibandingkan dengan adukan tanpa debu. (4) Adukan dengan jumlah debu spons yang menggantikan semen sebesar 5 % sampai 50 %, menghasilkan kuat tekan yang memenuhi standar ASTM. Kuat tekan tertinggi dihasilkan oleh adukan dengan substitusi debu spons sebesar 5 %. (5) Kuat lentur adukan cenderung turun seiring dengan meningkatnya jumlah debu spons yang menggantikan sebagian semen. (5) Debu spons dapat digunakan sebagai pengganti semen pada adukan sampai dengan 50 %. Penggunaan jumlah debu spons yang menggantikan fungsi semen pada adukan tergantung dari tujuan penggunaan adukan tersebut.

Kata kunci : adukan, limbah debu spons
BETON MUTU TINGGI TANPA PROSES PEMADATAN MANUAL
Authors: _ Pratikto , Susilowati Anni
Published: October 2023

The need of the advanced infrastructure facilities, such as long-span concrete bridges , high-rise concrete buildings should be considered as the new concrete development. Improving the quality of concrete can be done with a material change or replacement of some materials with steel slag. The recent time many industry take a part in using waste material from Cilegon steel. In Indonesia, high quality concrete compressive strength can be achieved a maximum strength about 60 MPa. Concrete properties will decrease as a result of the added material strength of cement, aggregates, and the presence of pores. Water cement ratio reduction (w/r) and the addition of admixture as silicafume often used to modify the composition of the concrete and reduce pores. W/r reductions result in reduced porosity and the pores of the concrete, but workability concrete also be difficult to do. In order to make concrete workable the used superplastisizer is the best solution to do. Small water cement ratio 0.2 and superplasticizer intramix kind High Range water reduction at a dose of 1.8% can produce high-performance concrete. In the cement composition 1217kg, 243kg of water, sand 446kg, 545kg steel slag, superplasticizer silicafume 24l 85kg and obtained high quality concrete with compressive strength of 588.53 kg/cm2 in slump flow with the weight of 2230kg/m3 64mm. Principles of compaction without using a vibrator to use a substance without reducing the quality of the concrete risers. Small factors of w/r requires careful stirring using a saturated aggregate surface is helpful meaning in manufacture high quality concrete.

Keyword : High Strength concrete, superplasticizer, steel slag, water cement ratio, slumpflow.
Rancangan Sistem Informasi Kinerja Program Studi Teknik Alat Berat Jurusan Teknik Mesin Politeknik Negeri Jakarta
Authors: Azwardi Azwardi
Published: October 2023

Abstract

Information and Communication Technology Development is very rapid to be applied in various fields, including the Draft Design of Performance Heavy Equipment Study Program Information Systems of Mechanical Engineering Department State Polytechnic of Jakarta. Lecturer and student performance information on Heavy Equipment Study Program is not well documented so it is difficult to know the status of student performance that includes the lecture, course assessment, students are still active and so on, while for the performance of lecturers include the presence of faculty, courses that how much is taught and the status of lecturers and other duties are. Information systems are developed to do the analysis and design using the Unified Modeling Language (UML). To display the GUI-based menus used GUI Design Studio. The results showed that the system design can proceed to the programming language for coding. The expected benefits of designing systems of performance information for teaching and learning processes can be better quality and performance reports can be reported accurately.

Keywords :Information System, Performance, Lecturers, Students

Abstrak

Perkembangan Teknologi Informasi dan Komunikasi sangat pesat untuk diterapkan dalam berbagai bidang, termasuk pada Rancangan Sistem Informasi Kinerja Program Studi Teknik Alat Berat Jurusan Teknik Mesin Politeknik Negeri Jakarta. Informasi kinerja dosen dan mahasiswa pada Program Studi Teknik Alat Berat tidak terdokumentasi dengan baik sehingga sulit untuk mengetahui status kinerja dari mahasiswa yang meliputi proses perkuliahan, penilaian mata kuliah, mahasiswa yang masih aktif dan sebagainya, sedangkan untuk kinerja dosen meliputi kehadiran dosen, mata kuliah yang diajarkan berapa banyak dan status dosen sedang tugas dan lainnya. Sistem Informasi yang dikembangkan dilakukan analisis dan disain dengan menggunakan Unified Modeling Language (UML). Untuk menampilkan menu-menu berbasis GUI digunakan GUI Design Studio. Hasil pernacangan menunjukan bahwa system bisa dilanjutkan untuk pengkodean ke bahasa pemograman. Manfaat yang diharapkan adanya perancangan system informasi kinerja agar proses belajar dan mengajar dapat menjadi lebih baik kualitasnya dan laporan kinerjanya dapat dilaporkan dengan akurat.

Kata Kunci : Sistem Informasi, Kinerja, Dosen, Mahasiswa
Sistem Inventori Kontrol Material Dan Peralatan Penunjang Praktek Mahasiswa (Studi Kasus Di Work Shop Jurusan Teknik Mesin Politeknik Negeri Jakarta)
Authors: Hamdi Hamdi
Published: October 2023

Abstract

Inventory Control is a mechanism for recording and reporting of inventory items. Nowaday the company / government agencies to apply the principles of the involvement of a number of applications and information technology that enables integration of all local procurement of goods and services into a process more efficient, effective, open and competitive, transparent, equitable, non-discriminatory and accountable. Long-term goals and targets of this research is to build an electronic inventory system of goods (inventory control) that can be applied at the Polytechnic. Thus the realization of a system of recording goods in the polytechnic process on line. Inventory system is built using the Zachman Framework and methodology to facilitate the encoding using object-oriented methods with UML (Unified Modeling Language) as the language in models design. Inventory system begins with the identification of system needs. Based on these needs will be the system design, which is modeled using UML. The results of this thesis in the form of an inventory system design Internet-based procurement has facilities to manage storage and recording of goods that are expected to occur no clerical error recording.

Keywords: Inventories, warehouses, online

Abstrak

Inventori kontrol adalah mekanisme pencatatan dan pelaporan barang persediaan. Jaman sekarang ini lembaga perusahaan / pemerintah untuk menerapkan prinsip-prinsip keterlibatan sejumlah aplikasi dan teknologi informasi yang memungkinkan integrasi semua pengadaan barang dan jasa menjadi proses yang lebih efisien, efektif, terbuka dan bersaing, transparan, adil, non-diskriminatif dan akuntabel. Tujuan jangka panjang dan target dari penelitian ini adalah untuk membangun sebuah sistem elektronik persediaan barang (inventory control) yang dapat diterapkan di Politeknik. Dengan demikian realisasi sistem pencatatan barang di politeknik diproses secara on line. Sistem persediaan dibangun menggunakan Framework Zachman dan metodologi untuk memfasilitasi encoding menggunakan metode berorientasi objek dengan UML (Unified Modeling Language) sebagai bahasa dalam perancangan model. Sistem inventori dimulai dengan identifikasi kebutuhan sistem. Berdasarkan kebutuhan akan desain sistem, yang dimodelkan dengan menggunakan UML. Hasil dari tesis ini dalam bentuk inventarisasi sistem pengadaan desain berbasis Internet memiliki fasilitas untuk mengelola penyimpanan dan pencatatan barang yang diharapkan terjadi ada rekaman kesalahan administrasi.

Kata kunci : Inventaris, gudang, online
ANALISIS SAMBUNGAN BALOK PRECAST SEDERHANA DENGAN SISTIM DOUBLE LAPSPLICES MIDDLE WET JOINT DI MOMEN MAKSIMUM
Authors: Hermawan Andrias Rudi , SM EKA
Published: October 2023

ABSTRACT

This research about connection of precast simple beam with double lapsplices middle wet joint system have finished with comparing of flexure strength between precast beam with connection at meddle span (middle wet joint) and conventional beam. Performance of flexure strength of precast beam with connection at meddle span (middle wet joint) is better than conventioanal beam, can be proved to curve of deflection – load between conventional beam (1 and 2) with precast beam with connection at meddle span (middle wet joint 1 and 2). Base on that curve, can be known that precast beam with connection at meddle span (middle wet joint 1) have deflection10 mm at 151,8 kn and precast beam with connection at meddle span (middle wet joint 2) have deflection16 mm at 169,2 kn and conventional beam 1 have deflection 47 mm at 145,5 kn and conventional beam 2 have deflection 40 mm at 144,7 kn

Keynote : prestressed,precast,boned nonprestressed,concrete