Showing papers by "Ubaidillah Ubaidillah published in 2022"

Field-Dependent Rheological Properties of Magnetorheological Elastomer with Fountain-Like Particle Chain Alignment

Abstract: Magnetorheological elastomer (MRE) consists of magnetic particles known as carbonyl iron (CIPs), which have been locked in a silicone-based matrix, in various alignments. However, current MRE exhibits inadequate rheological properties due to several issues such as particle alignments. Therefore, in this study, a new approach of the particle alignment of CIPs in MRE, namely fountain-like structure, is introduced. It is expected that this kind of MRE exhibits enhancement rheological responses, in off- and on-state conditions. This work includes the development of a new mold that can produce various directions of magnetic flux lines in order to have fountain-like structures of CIPs in MRE, during the curing process. Three types of particle alignments in MRE, namely isotropic, fountain-like and inverted fountain-like, are fabricated. The rheological properties of MRE in terms of storage modulus and MR effect are measured in an oscillatory shear mode using a rheometer. The results have revealed that fountain-like MRE exhibits higher storage modulus than the isotropic MRE, approximately 0.6 MPa of increment in the strain sweep test, in an on-state condition. Furthermore, it has been demonstrated from strain, frequency and the current sweep test that the rheological properties of fountain-like MRE related to storage modulus and magnetorheological (MR) effect are higher compared to the inverted fountain-like MRE.

Non-parametric multiple inputs prediction model for magnetic field dependent complex modulus of magnetorheological elastomer

Abstract: This study introduces a novel platform to predict complex modulus variables as a function of the applied magnetic field and other imperative variables using machine learning. The complex modulus prediction of magnetorheological (MR) elastomers is a challenging process, attributable to the material's highly nonlinear nature. This problem becomes apparent when considering various possible fabrication parameters. Furthermore, traditional parametric modeling methods are limited when applied to solve larger-scale cases involving large databases. Consequently, the application of non-parametric modeling such as machine learning has gained increasing attraction in recent years. Therefore, this work proposes a data-driven approach for predicting multiple input-dependent complex moduli using feedforward neural networks. Besides excitation frequency and magnetic flux density as operating conditions, the inputs consider compositions and curing conditions represented by magnetic particle weight percentage and the curing magnetic field, respectively. Extreme learning machines and artificial neural networks were used to train the models. The simulation results obtained at various curing conditions and other inputs confirm that the predicted complex modulus has high accuracy with an R2 of about 0.997, as compared to the experimental results. Furthermore, the predicted complex modulus pattern and magnetorheological effect agree with the experimental data using both the learned and unlearned data.

Natural Weathering Effects on the Mechanical, Rheological, and Morphological Properties of Magnetorheological Elastomer (MRE) in Tropical Climate

Abstract: Magnetorheological elastomer (MRE) materials have the potential to be used in a wide range of applications that require long-term service in hostile environments. These widespread applications will result in the emergence of MRE-specific durability issues, where durability refers to performance under in-service environmental conditions. In response, the outdoor tropical climatic environment, combined with the effects of weathering, will be the primary focus of this paper, specifically the photodegradation of the MRE. In this study, MRE made of silicone rubber (SR) and 70 wt% micron-sized carbonyl iron particles (CIP) were prepared and subjected to mechanical and rheological testing to evaluate the effects under natural weathering. Magnetorheological elastomer samples were exposed to the natural weathering conditions of a tropical climate in Kuala Lumpur, Malaysia, for 30 days. To obtain a comprehensive view of MRE degradation during natural weathering, mechanical testing, rheology, and morphological evaluation were all performed. The mechanical and rheological properties test results revealed that after 30 days of exposure and known meteorological parameters, Young’s modulus and storage modulus increased, while elongation at break decreased. The degradation processes of MRE during weathering, which are responsible for their undesirable change, were given special attention. With the help of morphological evidence, the relationship between these phenomena and the viscoelastic properties of MRE was comprehensively defined and discussed.

A Novel Z Profile of Pultruded Glass-Fibre-Reinforced Polymer Beams for Purlins

Abstract: Purlins made from galvanised steel in fertiliser warehouses have often been considered less efficient, necessitating a new purlin made using corrosion-resistant material to increase building efficiency. This study was an attempt to design a nine-metre purlin from glass-fibre-reinforced polymer (GFRP) composite material for a new fertiliser warehouse in Bontang-East Kalimantan, Indonesia. The purlin design selected in this study was the Z profile of pultruded beams from GFRP composite material that met the criteria of an efficient purlin, such as corrosion resistance, compact stacking, and ability to withstand technical loads. In particular, the Z profile becomes compact when stacked, and the GFRP material used is corrosion-resistant yet affordable. The primary materials for GFRP composites consist of long yarn glass fibre bundles for reinforcement and unsaturated polyester resin (UPR) for the matrix. Material strength modelling was based on analytical and finite element approaches. The analysis shows that the most considerable normal stress of “64.41 MPa” occurred at the two fixed end supports, while the most significant deflection of “45.9 mm” occurred at the mid-span of the purlin structure. The purlin structure was considered safe, as the strength and deflection were below the threshold. Thus, the Z profile of the pultruded purlin beams built using the GFRP composite material meets the technical criteria.

Physicochemical Characterization and Antibacterial Activity of Titanium/Shellac-Coated Hydroxyapatite Composites

Abstract: Titanium and hydroxyapatite are widely used as materials for implants. Titanium has good mechanical properties, good corrosion resistance, and a high modulus of elasticity. Hydroxyapatite has good biocompatibility, bioactivity, and significant osteoinductivity. In this study, powder metallurgy was used as a method to combine titanium and hydroxyapatite for use in implants. Shellac was used as a binder between ceramic and metal due to its lower melting point. The surface morphology and chemical properties were evaluated by scanning electron microscopy–energy dispersive X-ray (SEM-EDX), whereby the SEM revealed the appearance of micropores in the Ti-HA composites during the sintering process, and the EDX showed that the final product had high amounts of Ti and Ca and low P. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) analyses were used to achieve the chemical characterization of composites, whereby a weak diffraction peak was observed in the XRD spectrum of Ti-HA composites, and the FTIR analysis confirmed that the composites had carbonate (CO3)2−, phosphate (PO4)3−, and hydroxyl (OH)− groups. Oxygen was sufficient due to the sintering process being conducted in an air environment. The antibacterial activities were characterized using the disc diffusion method with Escherichia coli and Staphylococcus aureus bacteria, whereby the prepared Ti-HA composites had a greater antibacterial effect on E. coli than on S. aureus. Finally, pH changes were observed during the 24 h incubation. The result showed that the Ti-HA composite did not contain chemical compounds that could cause harmful effects for humans and had good antibacterial activity against E. coli.

Non-parametric multiple inputs prediction model for magnetic field dependent complex modulus of magnetorheological elastomer

Abstract: This study introduces a novel platform to predict complex modulus variables as a function of the applied magnetic field and other imperative variables using machine learning. The complex modulus prediction of magnetorheological (MR) elastomers is a challenging process, attributable to the material's highly nonlinear nature. This problem becomes apparent when considering various possible fabrication parameters. Furthermore, traditional parametric modeling methods are limited when applied to solve larger-scale cases involving large databases. Consequently, the application of non-parametric modeling such as machine learning has gained increasing attraction in recent years. Therefore, this work proposes a data-driven approach for predicting multiple input-dependent complex moduli using feedforward neural networks. Besides excitation frequency and magnetic flux density as operating conditions, the inputs consider compositions and curing conditions represented by magnetic particle weight percentage and the curing magnetic field, respectively. Extreme learning machines and artificial neural networks were used to train the models. The simulation results obtained at various curing conditions and other inputs confirm that the predicted complex modulus has high accuracy with an R2 of about 0.997, as compared to the experimental results. Furthermore, the predicted complex modulus pattern and magnetorheological effect agree with the experimental data using both the learned and unlearned data.

Enhancement of Magneto-Induced Modulus by the Combination of Filler and Plasticizer Additives-Based Magnetorheological Elastomer

Abstract: Filler additive is used to provide superior bonding in rubber matrix to enhance the storage modulus of magnetorheological elastomer (MRE). However, the magneto-induced modulus is reduced as the initial storage modulus increases. Therefore, this paper aims to increase the magneto-induced modulus and maintain the initial storage modulus by combining filler and plasticizer additives. Both types of additives have different functions, where cobalt ferrite (CoFe2O4) is capable of enhancing the maximum storage modulus and silicone oil (SO) reduces the initial storage modulus. Thus, four MRE samples have been fabricated using (a) no additive, (b) CoFe2O4, (c) SO, and (d) a combination of CoFe2O4 and SO. The sample’s hardness and magnetic properties were investigated via Durometer Shore A and Vibrating Sample Magnetometer (VSM), respectively. Furthermore, the rheological properties of MRE samples in terms of storage modulus were investigated upon the frequency and magnetic field sweep using a rheometer. The results demonstrated that the storage modulus of the MRE samples has increased with increasing the oscillation frequency from 0.1 to 50 Hz. Interestingly, the combination of additives has produced the largest value of magneto-induced modulus of 0.90 MPa as compared to other samples. Furthermore, their initial storage modulus was in between samples with SO (lowest) and without additive (highest). Therefore, fundamental knowledge in adding the combination of additives can offer solutions for a wide range of stiffness in MR device applications such as vibration and noise control devices, sensing devices, and actuators.

Development of Tiny Vane-Type Magnetorheological Brake Considering Quality Function Deployment

Abstract: Many studies focus on the torque-to-dimension ratio when designing magnetorheological brakes (MRB), especially for ankle foot orthosis (AFO) devices. Vane MRB is one type of MRB with a limited angle of motion that is naturally suitable to be applied to AFO. However, very few implement quality function deployment (QFD) when making MRB, whereas QFD is an essential factor in making product designs. In this study, a tiny vane-type MR brake (TVMRB) was successfully made using the QFD method. Torque characteristics are determined by analysis of magnetic flux density, theoretically, by 3D simulation, and by using Ansys Maxwell experimentally. For consideration, the analysis was carried out with fluid gap variations (0.5 mm, 0.75 mm, and 1 mm) and current variations (0.5–2 A with 0.5 A increments). As a result, ignoring the leakage of MR fluid (MRF), at a constant rotation of 10 rpm, the smallest torque of 6.14 Nm was obtained at the fluid gap variation of 1 mm and input current of 0.5 A, whereas the largest torque was 46.71 Nm at the fluid gap variation of 0.5 mm and input current of 2 A. Apart from torque, this article will also discuss other brake performances in the form of operational range and power consumption. Finally, the structure of the TVMRB design is compared with other designs presented in the House of Quality (HOQ).

Semi-Active Controllable Stiffness Engine Mount Utilizing Natural Rubber-Based Magnetorheological Elastomers

Abstract: This study proposes the design and fabrication of a natural rubber-based magnetorheological elastomer (NR-MRE) engine mount as a new device in absorbing the vibration originated from the automotive engine. The conceptual design was performed through a simulation process by Finite Element Method Magnetics to analyze the magnetic field distribution. The simulation result had indicated that the device was capable of generating an equivalent magnetic field density of 0.31 T at the effective area. The MRE was prepared by utilizing 60 wt% of carbonyl iron particles (CIPs), and the cavity was filled by compression molding. The MRE compound was tested based on its basic mechanical properties, while the MRE engine mounts were tested under a static compression load at off- and on-state conditions. It was observed that the compound possessed a good tensile strength for a load bearer matrix with an average of 12.65 MPa. Subsequently, the results of the static compression load had showed that the MRE engine mounts recorded an increase of 12% in the force generated as compared to conventional engine mounts at an off-state condition. Meanwhile, at an on-state condition of 2.4 A, the MRE engine mounts recorded an increase in the force generated with 106%. The study has demonstrated that the proposed device can be one of the potential candidates for vibration control applications due to its stiffness controllability.

Improve Household Income Through Peking Duck Farming

Abstract: Background: Community service was carried out to increase household income in the Serdang village, Curug district, Tangerang regency, by breeding and rearing Peking ducks. Contribution: Peking duck breeding and rearing farming is considered relatively low in maintenance, attainable ducklings, and affordable feed; while the problem of Peking duck breeding and rearing farming is the lack of capital. Method: The implementation methods consist of: the planning stage, the implementation stage, and the evaluation stage. Results: The result of this community service is the achievement of total 2,597.9 Kg of ready-to-sell Peking ducks, with the sales profit of Rp 17.950.750 per month. From the total of 1,100 heads initial ducklings reared the mortality rate of 91 occurred at the vulnerable age (5-15 days). Conclusion: By the end of the second season of community service, 3 (three) participants become self-suffcient Peking duck breeders

Industrial Implementation of Aluminum Trihydrate-Fiber Composition for Fire Resistance and Mechanical Properties in Glass-Fiber-Reinforced Polymer Roofs

Abstract: It is difficult to obtain suitable fire resistance and mechanical properties for glass-fiber-reinforced polymer (GFRP) roof material in industrial applications. Although some efforts to improve the fire resistance properties of GFRP have been carried out, in practice this sometimes degrades the mechanical properties. Therefore, the base materials, such as filler and reinforcing fiber, must be appropriately combined to simultaneously improve both fire resistance and mechanical properties. The present study examines improvements in GFRP roof material by investigating the effect of aluminium trihydrate (ATH) as a filler and the combination of a chopped strand mat (CSM) with woven roving (WR) and stitched mat (STM) fibers as the reinforcement in a composite GFRP roof structure. The roof samples were prepared following industrial machine standards using the specified materials. The mechanical properties of GFRP were evaluated using tensile, flexural and impact tests, following ASTM D638, ASTM D790 and ASTM D256 standards, respectively. The fire properties were examined through fire tests following the ASTM D635 standard. The results show that the GFRP roof composed of CSM/WR fibers had a 40% higher tensile strength (103.5 MPa) compared with the GFRP roof without CSM fibers (73.8 MPa). The flexural strength of the GFRP roof with CSM/WR fibers was also 57% higher than the roof without fibers, with a ratio of 315.61 MPa to 201 MPa. With the use of CSM/WR fibers, the fire resistance also increased by 23%, resulting in a ratio of 4.31 mm/min to 5.32 mm/min. These results demonstrate that the combination of CSM/WR fibers as a reinforcement would be an excellent option for producing an improved GFRP roof with better industrial properties, especially when producing improved GFRP roofs using a continuous lamination machine.

Helmet Stick Design for BC3 Paramlympic Bocia Games

Abstract: Boccia is one of the fastest-growing Paralympic sports and one of the few sports to have an Olympic rival. The BC3 boccia class is intended for athletes with locomotor dysfunction so severe in all four extremities that they require assistance from assistants and aids in the form of ramps and helmets equipped with pointer sticks. Therefore, the design of the BC3 boccia stick helmet was carried out to meet the needs of the athletes. The design was carried out by action research methodology with the concept of design, static simulation, manufacturing, and the house of quality. The design is divided into three main parts: the helmet bracket, shaft, and lock with bearings using M4 and M8 bolts. Static and design simulations used Fusion 360 and Ansys 2021 R2 software to determine design strength value. Stainless steel material is used in the design, considering the material selection using the Ashby diagram method. The maximum displacement value produced by design is 0.006 mm, and the minimum safety factor is 9.15. The manufacturing results produced helmet products with adequate accuracy and safety standards. A house of quality (HOQ) of 39% indicates that it can meet consumer needs better than other products.

Design and Implementation Data Logger with Integrated Circuit Multiplexer for Solar Panel Park

Abstract: This article describes the data logging technique for large-scale solar panels system. The input data of the developed data logger can be increased significantly by optimizing the Integrated Circuit (IC) Multiplexer analog input. Multiplexer ICs are suitable for recording parameter data on largescale solar panel systems, which are often called solar panel parks. The data logger system consists of an Arduino microcontroller equipped with a current sensor, a voltage sensor, multiplexer IC, RTC, and an SD card. The obtained data is stored on the SD-card every 5 minutes, in the form of a .txt file with the format of the day, date, time, current value, and the voltage value of each solar panel. The test results show that data acquisition on the solar panel park using a data logger with multiplexer IC has been able to store and display a large number of solar panel data.

Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

Abstract: This research was conducted to determine the effect of the time and frequency of magnetic field application on MRF pressure performance. It was carried out by placing magnetorheological fluid (MRF) in a U-shaped, glass tube and then repeatedly applying a magnetic field to it for a certain time period with a particular frequency set by the generator frequency. The length of the application period of the magnetic field, the frequency of the application of the magnetic field, and the magnitude of changes in fluid pressure that occurred and changes in pressure in the MRF were recorded with a data logger for a specific time, which was 60 s. From the field tests that were carried out, it was found that during the application of a continuous magnetic field, there was pressure on the MRF until it reached the maximum pressure; then, there was a gradual decrease in pressure when the magnetic field was turned off, but the pressure was intense. It was shown that the pressure decreased rapidly as the magnetism disappeared, even causing the pressure to drop below the initial pressure, which, in turn, gradually rose again toward the equilibrium pressure. Meanwhile, during the repeated application of a magnetic field, it appeared that the MRF effectively produced pressure in response to the presence of a magnetic field up to a frequency of 5 Hz. The higher the applied magnetic field frequency, the smaller the pressure change that occurred. Starting at a frequency of 10 Hz, the application of a magnetic field produced more minor pressure changes, and the resulting pressure continued to decrease as the liquid level decreased toward the initial equilibrium position.

Robot Ankle Foot Orthosis with Auto Flexion Mode for Foot Drop Training on Post-Stroke Patient in Indonesia

Abstract: Robot Ankle Foot Orthosis (AFO) has been proven to assist the gait impairment, such as the foot drop. However, development challenge is still remains, such as the trade-off between complexity, functionality and cost. High functionality resulted in high cost, bulky, and complex device. But affordability and simplicity may decrease functionality. Therefore, this research proposed a robot AFO, which has the necessary function of auto dorsi-plantarflexion so it can keep the affordability and simplicity. The robot AFO consists of structure, electronics part and algorithm. The structure is custom made according to the user’s anatomy. A brushless DC (BLDC) motor, Force-Sensing Resistor (FSR) and microcontroller builds the electronic parts. The BLDC motor actuates the flexion, while the FSR detects the gait phase to determine the action. Both are integrated by the microcontroller with the P control algorithm that commands the BLDC motor to generate necessary torque so it rotates in a constant speed. A functionality test has been carried out on the robot AFO, where the robot AFO perform a dorsi-plantarflexion continuously in three conditions, such as no load, 1 Kg load, and foot load. The robot AFO successfully performed a constant velocity rotation in both directions, in all conditions. In the case of 1 Kg load, the maximum angular speed is 0.7 rad/s dorsiflexion and -1.8 rad/s plantarflexion. The torque keeps increasing and decreasing from -0.3 Nm to 4 Nm to keep the angular velocity. The result shows that the robot AFO can perform the necessary function to assist the foot drop training. Functionality test on the gait detection has also been done where it shows that the robot AFO can detect the four gait phases accurately. The robot AFO has been tested and future study should test the robot on a real post-stroke patient to see the effect of the gait control in reality.

Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car

Abstract: The installation of aerodynamic devices, such as rear wings with the application of a Gurney flap, is very important to improve the performance of vehicles and can generate downforce and reduce slip when a car turns and brakes. The goal of this study was to determine the aerodynamic characteristics of the addition of a rear wing using an Eppler 423 airfoil, which was applied with a Gurney flap featuring variations in the angle of attack and the height of the Gurney flap. The rear wing was mounted on the Ahmed body with a rear slant angle of 15°, which is similar to the configuration on a fastback type car. This research was conducted by 3D modeling through computational fluid dynamics (CFD) simulation using ANSYS Student R18.2 by using ahmed body design. There are three variations in the angle of attack for the rear wing (0°, 7.5°, and 15°), as well as five variations in Gurney flap height of 0%, 0.5%, 1%, 1.5%, and 2% for the chord-line length. In this study, the best variation was found at an angle of attack of 15⁰ with a height of 2% C. From this configuration improved CL/CD ratio by 25.36% when compared to the results without a Gurney flap.

Redesign of water-diesel emulsion fuel mixer

Abstract: Emissions and fuel consumption are essential parameters to indicate the working of a combustion engine. This paper discusses the methods to achieve lower emissions and efficient fuel consumption. One of the methods is by making emulsion fuel. The emulsion-making methods are surfactant emulsion, micro-emulsion, ultrasonic emulsion, and real-time emulsion non-surfactant (RTES). In the research, the emulsion fuel is a mixture of B30 Biodiesel and water without surfactant that is supplied in real-time after being mixed in a mixer. The ratio is 85% biodiesel and 15% water. The RTES mixer in the old model has a big size, and high-power consumption of about 150-433,5 W. This research's purpose is to develop a simple design and low power consumption of the RTES Mixer. The new RTES mixer design only needs 150 W motor power. Its dimension is more superficial and produces tiny droplets with a main diameter range between 0.1 to 0.5 ?m, with good-mixed visually.

Leadership style types: The Importance of Organizational Culture and Change Management

Abstract: Introduction/Main Objectives: This study aims to determine the value of the direct influence between transformational leadership and change management, transformational leadership and organizational culture, organizational culture and change management, and deal with the indirect effect of organizational culture on transformational leadership and change management. Background Problems: In the era of globalization that is increasingly fast and dynamic, an organization must be able to adapt to changes in the environment, where changes in the organization must be managed properly and efficiently. Change management is a systematic and complex process carried out by an organization. One of the steps in determining the direction of change is to select the transformational leadership model, change management, and organizational culture. Research Methods: Review articles on the relationship between transformational leadership, change management, organizational culture, organizational change, and the mediating role of organizational culture on transformational leadership and change management. Finding/Results: There is a positive and significant correlation between transformational leadership and change management, transformational leadership and organizational culture, and organizational culture and change management, where organizational culture has a mediating role in the relationship between transformational leadership and change management. Conclusion: Transformational leadership are very influential on organizational changes and play an essential role in determining the direction of change management and organizational culture, using organizational culture to manage these changes.

Economic Improvement of Small and Medium Business through the Utilization of Waste

Abstract: This research aims to downstream/commercialize integrating the management of export-scale wood products with the potential for waste wood chips and sawdust as an impact, so as to increase village potential and create an environmentally friendly village in Manggung village in order to increase village potential. This research was conducted as a leap in the field ofwood product management and processing of waste wood scraps and sawdust into handicrafts and accessories. Improved financial management and marketing of wood production in Manggung village through improving the quality of human resources as well as export-import training to help increase exports of wood products as well as handicrafts and accessories. By utilizing local potential and local wisdom and increasing the role of persons with disabilities and victims of layoffs through training to increase knowledge and skills by cooperating with the support of the Boyolali District Government. Institutional strengthening of BUMDes Maju Makmur in optimizing the management of wood and wood waste through mentoring, training and provision of supporting equipment as well as improving governance capabilities and establishing teaching factories that will be used to study undergraduate students.

Perbandingan Antara Karakter Toleransi Terhadap Perkembangan Budaya Lokal Atau Ciri Khas Suatu Daerah Pada Muatan Pembelajaran IPS di Sekolah Dasar

Abstract: Tujuan Penelitian: Penelitian ini bertujuan untuk membandingkan budaya local di dalam pembelajaran IPS dengan mengunakan perkembangan teknologi pada saat sekarang untuk melihat indikator karakter toleransi Metode Penelitian: Jenis penelitian ini adalah penelitian kuantitatif. Penelitian ini melibatkan 1 variabel yaitu pembelajaran bahan ajar di kelas dengan jumlah sampel 16 siswa. Analisis data menggunakan statistik deskriptif dan inferensial Temuan Utama: Hasil yang didapatkan menunjukkan karakter toleransi siswa SD Negeri 45/I sridadi dominan dalam kategori baik, sedangkan karakter toleransi siswa dengan penerapan budaya local atau ciri khas suartu daerah sudah sangat cukup. dengan adanyan perkembangan budaya local atau ciri khas suatu daerah agar dapat membantu guru dalam proses pembelajaran berlangsung dengan baik,dan dapat mempermuda untuk siswa/siswi dalam memahami materi yang di berikan oleh guru.dengan mengunakan budaya local dalam pembelajaran IPS berlangsung mempermudah dan tidak bosan dalam suasanan belajar, maka dari itu dengan mengunakan tahmbahan dari teknologi informasi komunikasi /TIK guru dapat mengajarkan siswa mengenai yang ada dinegara kita,dengan mengunakan budaya local arau ciri khas suatu daerah agar lebih berkembang lagi di masa-masa sekarang apa lagi guru bisa mengatur bagaimana cara memperkenalkan budaya local yang ada diindonesia dapat memberi gambar-gambar yang muncul jadi menarik agar tidak mudah bosan Keterbaruan Penelitian: keterbaruan penelitian ini ditinjau dari hal yang akan diteliti yakni mengenai tingkat karakter toleransi di kelas dengan menggunakan modul cetak dan elektronik materi perkebabangan budaya atau ciri khas suatu daerah Tema 7 Subtema 2 Pembelajaran 1 (Indahnya Keragaman di Negeriku)

Network forensik untuk menganalisa trafik data game online

Abstract: Network forensics adalah salah satu cara dalam menganalisi jenis trafik dalam sebuah jaringan adalah dengan menggunakan file log dengan merecord aktifitas pada jaringan. File log disetiap sistem sering dipakai untuk media melihat aktifitas pada sebuah sistem, terkhusus pada sebuah router dan server file ini sangat diperlukan proses investigasi analisis forensik jaringan dengan menggunakan metode Generic Network Forensics Process Model yang merupakan ilmu digital forensik yang berkaitan dengan tahap-tahap untuk menemukan sumber serangan dan mendapatkan bukti-bukti serangan yang bersumber dari file log. Tujuan dari penelitian ini dapat menerapkan model network forensic dalam memonitoring trafik games-online dan dapat menghasil satu sistem yang dapat menentukan prioritas memberian bandwidth, dan juga dapat dijadikan sebagai salah satu dasar pengambilan keputusan dalam membagian bandwidth. Hasil penelitian yang telah dilakukan telah mampu menganalisi jenis trafik game online dengan menggunakn tool wireshark untuk sniffing packet data serta membaguan sebuah sistem autentikasi untuk memvalidasin user pengguna jaringan. Pada tahap awal penelitian ini hasil investigasi forensik jaringan. Berdasarkan hasil pengujian tersebut dapat dinyatakan hasil sudah sesuai dengan tujuan yang diharapkan, sehingga dapat disimpulkan penelitian ini berhasil berjalan dengan baik

Sistem Informasi Akuntansi Pengelolaan Iuran dan Buku Kas Pada PDU Kelurahan Pabuaran

Abstract: Penelitian ini dimaksud untuk melakukan pengembangan sistem informasi akuntansi dalam pengelolaan iuran sampah dan buku kas pada Pusat Daur Ulang (PDU) Kelurahan Pabuaran. Sistem informasi akuntansi tersebut dapat memberikan kemudahan dalam mengelola keuangan yang berasal iuran sampah oleh petugas PDU. Dengan menggunakan sistem informasi, pengelolaan data iuran dan transaksi kas dapat lebih efektif, efisien dan tentu lebih akurat bila dibanding dengan cara manual. Data transaksi yang diolah meliputi transaksi penerimaan iuran dari petugas kolektor, transaksi penerimaan kas dan transaksi pengeluran kas. Sistem informasi akuntansi dikembangan dengan menggunakan metode waterfall. Sistem informasi berupa aplikasi berbasis web yang dikembangkan dengan menggunakan bahasa pemrograman PHP dan basis data MySQL.

Pengaruh Motivasi Kerja terhadap Kinerja Pegawai Bidang Pendidikan Luar Biasa Pada Dinas Pendidikan Provinsi Jambi

Abstract: This study aims to obtain an overview of work motivation and employee performance at the Jambi provincial education office in the field of special education. Data collection was carried out through distributing questionnaires and carried out on 53 employees. The aspects studied are 5 dimensions of work motivation, namely physiological needs, security needs, love needs, self-esteem needs, and self-actualization needs. As well as the performance aspects studied include quantity, quality, punctuality, attendance, and ability to work together. Testing the data using statistical analysis such as validation and reliability tests, simple linear regression analysis, statistical hypothesis testing t test and coefficient of determination test from the results of the analysis with SPSS version 20 program, it can be seen that the regression equation formed The linear regression equation formed is Y 20.966+0.388X. The equation shows that the employee's performance is 0 then work motivation will increase by 0.388. From the results of the analysis obtained, it is known that the results of R square indicate that there is an influence of work motivation of 21.3% on employee performance, thus in the study of work motivation which has an influence on performance, the average number of effects of work motivation on employee performance as a whole is 21. ,3 and the remaining 78,7 are influenced by variables not examined in this study. Overall, from the 5 dimensions of work motivation variable, it has an average score of 221.8 which is categorized as good. Where the description of work motivation used by employees in the field of extraordinary education at the Jambi provincial education office is obtained, which is good for motivating work on the basis of consideration and good for work motivation. Motivation has a positive and significant influence on the performance of the Jambi provincial education office employees.

Bibliometric Review of Magnetorheological Materials

Abstract: The findings and technological developments related to intelligent materials are increasingly attracting the attention of scientists. One such field is that of magnetorheological (MR) materials. Scientific studies on MR materials have been carried out to determine the performance and characteristics of, for example, MR dampers, MR elastomers, and MR foams. To the best of the authors’ knowledge, there has been no statistical discussion in the form of bibliometric analyses of developments in the field of MR materials in the last ten years. This is fascinating, considering that bibliometric studies have considerable impacts and contributions, such as studies on the growth of research patterns, avoiding the repetition of research topics, and analyzing future research. This also supports the future sustainability of the topic of MR materials, helping to bridge the gap that has probably existed since the introduction of MR materials. The relationship between the authors’ scientific research, domestic and global collaborations, and the evolution of themes over the last few years is also shown in this analysis. Thus, this study aimed to fill the gap in such materials by conducting a bibliometric analysis of 1830 articles related to MR materials published over the last 10 years. The results indicated that the field of MR materials has exhibited good growth. The introduction of MR fluid materials to new types of MR materials is still in the early stages of research, such as in applications with MR foam. Further analysis showed that there is a connection and dominance of scientific publications related to MR technology. Furthermore, based on bibliometric analysis, dominant theme changes in the area of MR elastomers, particularly related to carbonyl iron particles and MR polishing, is seldom mentioned, as is also the case for MR gels, MR foam, and MR grease. However, the discussion of new MR materials is a good opportunity to promote developments in the field of MR materials.

Force and stiffness behavior of natural rubber based magnetorheological elastomer bushing

Abstract: This research introduces a magnetorheological elastomer (MRE) bushing that has the potential to be applied to vibration control for automotive applications. An annular shape of MRE bushing is designed and fabricated by natural rubber (NR) based MRE with homogenous distribution of carbonyl iron particles (CIPs). The component consists of five parts, which are the inner and outer pipes, MRE, coil bobbin that wound by an electromagnetic coil, top and bottom ring plates, and housing. Based on a conceptual design, the electromagnetic circuit is simulated using Finite Element Method Magnetics (FEMM) software for analyzing the distribution of magnetic flux. The fabricated MRE bushing is undergone a compression test and load adhesion test for the performance evaluation. The compression test is conducted by using the Universal Testing Machine (UTM) under various applied currents to obtain the force-displacement and stiffness behavior of the device. This study demonstrated that higher forces and stiffness are achieved compared to other MRE bushings. From here, at 5.5 mm of displacement, the ranges of forces are from 7.1 kN (off-state) to 8.5 kN (on-state at 2.5 A). Furthermore, the stiffness is increased by 19% from off-state to 2.5 A. Overall, the fabricated MRE bushing shows a significant response with the presence of the magnetic field from the simulation studies and experimental results. Thus, it has the potential for vibration control due to the ability to control rigidity.

Using Liquid Organic Fertilizer for Banana Stems for Bean Plants of Farmers Group at Mendalo Darat Muaro Jambi Regency

Abstract: The type of soil planted is Ultisol soil which has many problems with low physical and chemical properties; hence the soil fertility is low. To be able to grow peanuts optimally, it is necessary to apply fertilizer to the soil. This article was to assist groups farmer in the use of liquid banana stem fertilizer for long bean plants. The method uses Participation Action Research (PAR). Some of the mentoring programs carried out were counseling on materials and practices for making liquid fertilizer which lasted for 4 months through several stages: preliminary survey, schedule determination and outreach of extension in the manufacture of liquid organic fertilizer from banana stems for long beans. The extension is carried out in two stages, namely by the method provides material related to the manufacture of liquid organic fertilizer for banana stems and also material on how to use banana stem organic fertilizer for long bean plants. After that, it was continued by carrying out a direct demonstration in the field on how to give liquid organic fertilizer from banana stems to long bean plants in farmer groups, In addition, farmer groups can make liquid organic fertilizer from banana stems and have also been able to determine the dose for long bean plants. In the appearance of long bean growth, the leaves are very green and bear fruit after adding liquid organic fertilizer. After the implementation of this service, it can be seen that the yield of long beans has increased from 10 tons to 17.5 tons per ha. Keywords: Liquid Organic Fertilizer, Assistance Farmer Group, Banana Stems

Jual Beli Online dengan Menggunanakan Sistem Dropshipping dalam Perspektif Hukum Islam

Abstract: Abstract: Over time, e-commerce has developed very rapidly in terms of innovative buying and selling transactions, one of which is a dropshipping buying and selling transaction model. This transaction model invites several ikhtilaf scholars regarding the validity of the transaction. Therefore, it is necessary to observe more deeply about its legal status, bearing in mind that in buying and selling, the object of sale and purchase (المبيع) must at least be owned by the seller in advance, both in muamalah fiqh law and in statutory regulations, because in positive law nothing is explicitly stated. directly regulates the sale and purchase of dropship. To answer the problems that exist in this study, the researchers used a descriptive qualitative research method. Data collection techniques in this study used interviews and observation. Then the data obtained were analyzed using data verification. Based on the results of the discussion, buying and selling with the dropship system in the view of Islamic law is permissible if the contract uses a wakalah contract.

The Pattern of Development of Competence, Commitment, and Motivation of Teachers in Pesantren

Abstract: This study aims to analyze the development of competence, commitment, and motivation of teachers in the Mu'adah Islamic boarding school. This study used a qualitative method with a multi-case type and was conducted at the Al-Amin Sumenep and Sidogiri Islamic boarding schools, Pasuruan. Data collection techniques used the instruments of the interview, observation, and documentation. Several activities in analyzing data include; data condensation, data presentation, and conclusion drawing. The results of this study found that the development of teacher competence at the Mu' Islamic boarding school is to apply a pattern based on spirituality and professionalism through integrated, holistic, and continuous coaching and training strategies, as well as to cultivate self-taught learning. The development of teacher commitment is based on the principle of devotion because Kyai, coaches, teachers, and students live together and are supported by a religiously nuanced Islamic boarding school environment. The development of teacher motivation is based on the values of sincerity and blessing combined with modern professional management.

Lane Change Aspect Ratio and Dimensionless Path for Emergency Obstacle Avoidance

Abstract: This paper focused on the use of the nondimensionalization approach in autonomous collision avoidance, while taking into consideration five functions, namely circular arcs, ramp sinusoidal, and polynomials (quintic, septic, and cubic), for emergency lane-change manoeuvres. The aspect ratio, which is the ratio of the total longitudinal distance to the total lateral distance during a lane change, was obtained for each function. The dimensionless vehicle velocity is a single function that combines the vehicle velocity, total lateral distance for lane change, and tyre-road friction coefficient. The aspect ratio was plotted against the dimensionless vehicle velocity to obtain a dimensionless decision-making diagram. The intersection point between the curves produced by the autonomous emergency braking and autonomous emergency steering was identified for each decision-making diagram. Among the five functions, the circular arcs achieved the smallest aspect ratio, while the septic polynomial gave the largest aspect ratio. The dimensionless decision-making diagram may serve as a useful tool for the study of autonomous collision avoidance manoeuvres.