bluuebunny/crossref_metadata_2025_split huggingface dataset:
The study of xylanase immobilize enzyme using sol-gel method
Authors: Hadiantoro S , Maryanty Y , Wulan D R , Putri S A , Putra E M , Achmadin N S 
Published: February 2021

Abstract
Xylanase has many benefits, but many obstacles to produce it. Common microorganisms produce fungi and bacteria such as Aspergillus niger, Trichoderma viride, and Bacillus subtilis. Various methods can do enzyme immobilization; one of them is entrapment in the form of sol-gel. This study discusses the xylanase activity. The enzymes have produced from Aspergillus niger, Trichoderma viride, and Bacillus subtilis. After that, the xylanase enzyme has immobilization using the sol-gel method. This study is doing by lab work and study literature. Lab work is for knowing fiber amount by van Soest method with amount of % hemyselulosa 4,8% 7,33%, 9,1% for media 0 months, two months, and four-month. The study literature doing with compare xylanase amount by Aspergillus niger, Trichoderma viride, and Bacillus subtilis the highest enzyme activity by Trichoderma viride with optimum condition temperature 25°C, pH five and incubation time 36 hours with enzyme activity 26,67 U/mL. The immobilization obtained xylanase activity of 28.88 U / mL. The matrix composition of TEOS, 5% xylan, and 5% calcium alginate during fermentation for 168 hours. This value is higher than the fermentation process without immobilization carried out for 72 hours with an activity value of 22.04 U / mL.
Syngas production process from catalytic cracking of glycerol based on modified zeolite catalyst Ni/ZSM-5
Authors: Dewajani H , Moentamaria D , Hakim A R , Iswara M A I , Mahsunah I Z , Rahima A F 
Published: February 2021

Abstract
Increased biodiesel production has an effect on increasing the availability of glycerol, where glycerol is a by-product of biodiesel production. So far, the use of glyserol is less than optimal where only a small portion is used as an additive in the food industry. So it needs efforts to utilize glycerol becoming a more valuable product. Based on its characteristics, glycerol is potentially converted with catalytic cracking process produced gas that are enrich in H2, CO which is known as synthesis gas (Syngas). Syngas is the main ingredient in the petrochemical industry, besides syngas can also be used as an alternative fuel do to its heating value. The main objective of this research is to study the conversion of glycerol to syngas with the catalytic cracking process, the effect of the ratio of catalyst to glycerol and reaction temperature on product yield. This research was carried out in a semi batch reactor filled with Ni/ZSM-5 catalyst which was flowed by Nitrogen gas at 350, 400, 450 and 500°C reaction temperature variations with catalyst ratio of 0, 3, 4 and 5% (w/w). Gas products were analyzed using Gas Chromatography (GC) to determine the composition of the constituent gases which are CO, CO2, H2 and the catalyst characterization was carried out by the BET, XRD and AAS methods. The highest yield was obtained at a proocess temperature of 500 °C with catalyst ratio of 3 wt % which produced 49.45% of Syngas with the hydrogen selectivity of 20.94%.
The effect of tranducer distance on the concrete crack depth measurement using PUNDIT
Authors: Suhariyanto S , Arystianto D P , Raharjo B A 
Published: February 2021

Abstract
The depth of crack in concrete structural elements can be measured using ultrasonic waves. One tool that can be used is PUNDIT. The research was conducted by measuring the depth of cracks on the concrete beam test object with a variation of the PUNDIT transducer distance. The purpose of this research is to determine the effect of the distance of the transducer (b) on the relative error (% error) measured in the cracked concrete depth. The results showed that the results of concrete crack depth measurements with the smallest relative error (% error) is obtained by adjusting the transducer distance to about 2/3 or 0.67 the thickness of the test object (h). At the distance of the transducer less than 0.67 or more than 0.67 the thickness of the test object, the relative error (% error) will be greater.
Usability measurement for Sistem Proyek Akhir Manajemen Rekayasa Konstruksi (SIPROK-MRK) measured with the system usability scale
Authors: Wahiddin W , Syulistyo A R , Shoumi M N 
Published: February 2021

Abstract
During the corona virus pandemic, the thesis examination in the Construction Engineering Management study program was conducted online. This is in accordance with the rules of the director at State polytechnic of Malang. Based on this background, a thesis examination system was developed to enable the tests to be conducted online. The main features of this application are the guidance assessment, exam evaluation and revision can be done online. To evaluate the system that has been developed, the usability level of the application is measured using the System Usability Scale. System usability scale is a technique used to measure usability score, system quality, the information presented and the system interface. Based on the questionnaire filled by user the usability score of SIPROK-MRK was 0,82.
The development of interlocking models of lightweight bricks and shear failure assessment of its wall structures
Authors: Rochman T , Rasidi N , Aditya Y 
Published: February 2021

Abstract
In this paper the development of interlocking models of lightweight bricks is proposed and its shear failure assessment in wall structures has been studied. Walls are a brittle infill structures and quiet vulnerable to collapse compared among all building components when a strong earthquake occurs. An interlocking system approach is such a simple method that is proposed to make sure the wall behave keep strong and stiff during seismic load. This research was performed to improve the shear capability and modelling of lightweight brick as well, which is interlocked each other. The data from the specific gravity testing results and its compressive strength then inputted as one of the modelling parameters. An experiment was carried out utilizing the Taguchi method to find out the optimum mixture used in shear testing in medium scale of walls. The compressive strength and shear strength testing methods follow the Indonesian code of SNI 03-1974-1990 and ASTM E2126-2011. The cube specimens of 15x15x15cm were used for compressive experiments, while a set of wall structures of 100x100 cm that was surrounded by reinforced concrete practical frame of columns and beams of 13x13 cm was used as shear test specimens. From shear testing results that using cyclic loads, it was found that the system can resist a maximum load of 45 kN by a lateral deflection of 45 mm. The results also obtained elastic stiffness of 2.55 kN / mm, the yielding behaviour occurs at the load, lateral deflection, ductility factor Δf/Δy and shear strength of 38.25 kN, 14,961 mm, 2.61 and 35,714 kN / mm respectively, which means that each width of 1 mm wall can be resist a shear load of 35,714 kN. It can be simply concluded that in cyclic shear loads, the more the wall is getting damaged or cracked, the structural stiffness will decreased as shown in a hysteresis behaviour.
Small scale hybrid power generation for remote area electrification
Authors: Hidayat M N , Ronilaya F , Eryk I H , Wibowo S , Hakim L 
Published: February 2021

Abstract
Javan Langur Centre (JLC) is a facility dedicated to the treatment of langur, an endangered primate species. To support the maintenance and rehabilitation activities, the need for electrical energy is a vital. In this facility, electrical energy is needed for lighting and baby primate’s incubator with a total power of around 120 watts. There is no electricity grid included in this area and the supply of electrical energy is still very dependent on the gen-set owned by the residents which is located approximately 2 km from JLC, making it less efficient. In terms of natural energy resources, JLC has the availability of water sources that originate from small streams making it possible to develop pico-hydro technology. There has been built a pico-hydro power generation with a potential electric power that can be generated approximately 300 watts. However, the water discharge of the river stream in that area is quite low, around 0.00035 m3/s, that makes the efficiency of the power generation is 10% only. In other words, the actual electrical power that can be generated is around 30 watts. So as to meet the electrical power needs at JLC, another electrical energy source is needed. One alternative is to install solar cells or photo voltaic (PV) with a capacity of 100 watts peak. The output power of these two energy sources can be combined and regulated by applying Hybrid Power Generation technology. With the application of this technology, the need for electrical energy in the JLC area can be met.
Authenticity of money using the method KNN (K-Nearest Neighbor) and CNN (Convolutional Neural Network)
Authors: Rahmad C , Rohadi E , Lusiana R A 
Published: February 2021

Abstract
Nowadays, the circulation of counterfeit money is significantly increased, encouraging to conduct research related to genuine real money detection or counterfeit money based on digital imagery. Technological sophistication one of the quality of printers whose ink is very good and can print money like the original makes the layman should be more wary of money ownership. In this research conducted the authenticity of money using the method KNN (K-Nearest Neighbor) and CNN (Convolutional Neural Network). Accuracy KNN method is 87,75%. While the detection accuracy used by CNN is 96,67%. The results obtained from these 2 methods can still be improved with advanced research namely with pre production on the set and the image used. The data set used has the same exposure level, image capture angle and image size.
Finite element modeling and analytic algorithm for electromagnetic performance of Permanent Magnet Synchronous Generator (PMSG) 24 Slot 16 poles from modification of induction motor 0, 75kw 3 Phase
Authors: Wibowo S S , Saputra M , Santoso A H , Rosidah N , Arinda A 
Published: February 2021

Abstract
Modification of the induction motor into a permanent magnet synchronous generator is to put a permanent magnet on the squirrel cages stator to generate the magnetic pole as a replacement for the electromagnet pole produced at a separately excitation of the conventional synchronous generator called the Permanent Magnet Synchronous Generator (PMSG). The purpose of this research is to design PMSG by modification of induction motors into permanent magnet synchronous generator with 24 slots 16 pole by using radial flux and utilizing stator. This research is a software-based FEM (Finite Element Method) for design and the magnetic Material used for permanent magnet synchronous generators is Neodymium Iron Boron (NdFeB). The PMSG on this design obtains the back EMF constant for its half-cycle of 4.902 rad/s and gets a voltage of 191.455 Vdc at 375 rpm speed and when given the loading of 100 Ω at 375 rpm speed produces a voltage of 176.73 Vdc, the current of 1.77 A and the output power is 313.24 Watt with efficiency reaching 85%. The PMSG modelling is done to have a specification of 24 slots 16 poles, changes the the characteristic Induction motor with synchrounous speed of 1500 rpm becomes as low as 375 rp. So This PMSG modification can be used as wind turbine or microhydro power palnt with low speed prime mover energy.
Mini PC based parking location determenation in POLINEMA
Authors: Kusumawardani M , Suharto N , Wirayoga S 
Published: February 2021

Abstract
Motorbikes and cars are the most widely used means of transportation by students, lecturers, and employees at Polinema. 14 motorcycle parking locations are available with a total capacity of approximately 6605 motorcycles and 18 car park locations with a capacity of around 330 vehicles. With a total of 12,226 students and 530 permanent lecturers and assuming 50% of them bring vehicles to campus at the same time, it can be estimated that the real need for parking and the difficulty in finding a parking space that is currently empty. The purpose of this study is to provide information to parking users about the location that can be occupied by the vehicle. The method used is to install 2 infrared sensors in 8 parking locations. Every 2 minutes the sensor sends data to the server, and then the server processes and provides information about the parking space vacancy. Information is displayed through displays displayed at each parking location in POLINEMA. The results of the work of the system made in this study can be seen on a monitor connected to the server which will make it easier for motorists who want to park their vehicles in the POLINEMA area. Measurements taken to see system performance are delay and the success rate of the system. Of all the measurements, the largest delay average was 1.9 seconds and the smallest delay average was 0.636 seconds. for the success rate it has the highest 100% and for the lowest is 80%.
Analysis and comparison of nonlinear control for DC/DC buck converter in PV system
Authors: Palupi L N , Winarno T , Mandayatma E , Ardhenta L 
Published: February 2021

Abstract
The use of DC power systems is increasingly widely used, so we need a system to convert DC power systems, one of which is a buck converter. The buck converter system requires a controller so that the output voltage generated is as desired without any disturbance when the buck is operating. This study examines improvements in buck converter performance using backstepping and SMC controllers. Backstepping controller and SMC are able to maintain stability where it can be shown by looking at the output voltage value of the buck converter. The results of a comparison of the simulation implementation of the backstepping controller and the SMC show that the recovery time of the SMC is faster than backstepping. From this comparison it is also seen that the amount of SMC voltage deviation is smaller than backstepping.
Energy Database Management System (EDBMS)-based data acquisition audit for electricity savings analysis
Authors: Syamsiana I N , Wibowo S S , Hakim M F , Ridzki I , Firjatoellah R 
Published: February 2021

Abstract
State Polytechnic of Malang (POLINEMA) has taken a part of a joint action to energy savings. The load profile of POLINEMA has specificity in the intensity of electricity energy (IKE) consumption due to it charachterictic as a vocational higher education. This specificity has caused POLINEMA to have many laboratories and workshops in each building. Energy savings can be done if it is supported by an energy consumption data audit system. The data will be calculated and compared to IKE standart. For that purpose, this research is aimed to design and implement an Energy consumption monitoring device based on Enegry Database Management System (EDBMS). In this research, the energy audits were carried out on the lighting and cooling systems of seven buildings in POLINEMA, namely AB, AC, AD, AE, AF, AG, and AH buildings. After auditing of each building is as follows, the IKE value in the AB building is 30.5 kWh/m2/Year, the AC building is 7.5 kWh/m2/Year, the AD building is 15.2 kWh/m2/Year, the AE building is 24.3 kWh/m2/Year, AF building at 71 kWh/m2/Year, AG building at 79.5 kWh/m2/Year, and AH building at 22.6 kWh/m2/Year. In conclusion is Energy consumption in POLINEMA is classified as efficient where the standard of a building for Commercial/Education is 240 kWh/m2/Year.
Improving teleoperation robots performance by eliminating view limit using 360 camera and enhancing the immersive experience utilizing VR headset
Authors: Wibowo S , Siradjuddin I , Ronilaya F , Hidayat M N 
Published: February 2021

Abstract
A teleoperated robotic system offers a rapid deployment for performing tasks in dangerous environments. An effective teleoperation requires a proper feedback system such as a vision system using cameras. Despite its effectiveness of using camera, the limited field of view (FoV) become one of the main burdens of the operation. To deal with this problem, some researchers used wider-view camera or multiple cameras. In contrast, this research proposed to achieve a better teleoperation by eliminating FoV limit by using 360 camera. This research also aimed to improve the immersive experience by utilizing virtual reality (VR) headset. The proposed framework then developed to accommodate all the requirements and then evaluated by some numerous trials by some participants. An AprilTag marker was placed on the robot and tracked by a ceiling mounted camera to record the trajectory data. The obtained trajectories then measured its performance by using a standard performance metrics. The experiments demonstrated that the proposed method achieved lower collision area, closer to desired ideal path and smoother than using a standard camera as the feedback system. However, as the 360-video streaming induced higher latency, the proposed approach was slower. The measurements justified that the proposed approach achieved a better teleoperation especially for mission critical tasks.
Solar panels output optimization using Phase Change Material (PCM) and heatsink applied in open-pit mining
Authors: Widodo S , Taqwa A , Rusdianasari R 
Published: February 2021

Abstract
Solar energy can be utilize to power a system located far from the electricity sources such a mobile tower applied in open-pit mining in PT Bukit Asam Tbk. However, the tropical weather in an open-pit mining can increase the surface temperature of a Photovoltaic (PV) panel, lead to overheating and the reduction of the efficiency and the reduced electricity power. This condition requires a cooling system to reduce the temperature. This paper presents the application of Phase Change Material (PCM) and heatsink as the cooling system for a PV panels. The PCM installed are in two sizes aluminum hollows, a 0.0025 m3 and 0.00625 m3. The experiment was conducted in 2 batches, 14-29 February 2020 for the installed 0.0025 m3 aluminum hollow, and 1-14 March 2020 for 0.00625 m3. The application of a 0.00625 m3 can reduce the PV panel’s surface temperature up to 3-5°C. The generated current using PCM 0.00625 m3 is 0.034 A for Isc and 0.014 A Iload higher than without cooling system. The application of a aluminum hallow with the size of 0.00625 m3 gives 9-20% efficiency, and the efficiency gives 8-15%. The experimental results show that the use of a hollow aluminum with a size of 0.00625 m3 can reduce the surface temperature of the PV panel and increase the power and efficiency of the PV panels.
Automatic irrigation monitoring system based on photovoltaic solar energy with fuzzy logic
Authors: Ariyanto Y , Wakhidah R , Utari H F , Harijanto B 
Published: February 2021

Abstract
Indonesia’s food self-sufficiency program requires the use of paddy fields with rice as the main food. That irrigation infrastructure problem also needs efficiency mitigation of cost impact using fuel oil in operation manually of engine irrigation. An automatic photovoltaic irrigation system can solve the problem of deficiency irrigation infrastructure, especially in the dry season as a more efficient power supply for irrigation infrastructure. In this research, implemented the automatic photovoltaic irrigation system is combined with the sunlight tracking system to get power supply, according to the direction of the sun. The irrigation pattern requires the suitability of soil moisture, water level, and power supply voltage as variables for the application of an automatic photovoltaic irrigation system. An automatic photovoltaic irrigation system is equipped with a website to monitor the irrigation variables. The Irrigation variables data is obtained from sensor readings then sent by NodeMCU to the website and calculates the suitability of irrigation variables as parameters using fuzzy logic to control automatic irrigation. The conclusion from this study was obtained after testing the system with the system running well, fuzzy logic parameters run with variables value of voltage > 9.9 Volt, water level < 2cm, and soil moisture < 69%.
A development of an Arduino pure sine wave inverter for a small scale off-grid solar PV system
Authors: Ronilaya F , Ilmawati S , Huda M , Anistia W , Syamsiana I N , Hidayat M N 
Published: February 2021

Abstract
This paper presents the implementation of Arduino Nano microcontroller for a single-phase pure sine wave inverter, which can convert DC voltage to AC voltage at high efficiency and low cost. Solar-powered electricity generation is being favored nowadays as the world increasingly focuses on environmental concerns. The designed inverter converted DC voltage into AC voltage for a small-scale off-grid solar PV system suitable for electrification in remote areas, pollution-free, and inexpensive. Its inverter uses a sinusoidal pulse width modulation technique and a simple circuit, consisting of only 2 MOSFET switches and 1 MOSFET driver. The H-bridge inverter’s output is applied to a step-up transformer with a dual coil input and a single-coil output, and hence, we can create positive and negative sides of the wave. Mitigate a voltage noise; a capacitor is parallelly installed at the secondary side of the transformer. Several simulations are performed to verify the effectiveness of the designed inverter using Proteus software, and continued hardware implementation. Based on some experiments we have done, the designed inverter produces a 230 V r.m.s 50 Hz sine wave with very low harmonics distortion. The highest efficiency was obtained using 2200nF / 400V of the filter capacitor, and the smallest voltage regulation gained using 2200nF / 400V of the filter capacitor when compared with other capacitors. The proposed system is economical, efficient, and reliable and can be used for small scale power applications.
Solar panel performance monitoring using Wireless Sensor Network in State Polytechnic of Malang
Authors: Junus M , Hidayati N , Wijayanti R A 
Published: February 2021

Abstract
The electricity supply used in State Polytechnic of Malang (Polinema) is still fully supported by PLN by utilizing the electricity source of the Electric Steam Power Plant (PLTU) with coal as a fuel. As the use of electricity in Polinema’s environment is very large, this has an impact on the expensive cost that must be incurred every month. The use of solar power as a new source of electricity that utilizes the nature of renewable energy can be used as an alternative electricity in Polinema. Supported by the use of solar panels with relatively affordable price and can be used as a long-term investment, it is expected that the use of electricity from PLN can be replaced by this solar power plant (PLTS). In this research, a prototype of electrical energy monitoring device produced by solar panel using several sensors connected in one network or commonly called Wireless Sensor Network (WSN) was designed and made. WSN was built using ESP32 microcontroller which is assembled with a voltage and current sensor which then the readings from the sensors will be sent wirelessly to the router to proceed to the server with internet facilities. Information from the sensors are being continously stored and monitored, so user can see the results of WSN reading from any location connected to the internet (real time).