bluuebunny/crossref_metadata_2025_split huggingface dataset:
Zinc oxide and Zinc oxide Nanoparticles Carbon Past Ion Selective Electrode: A Cyclic Voltammetry Comparison Study
Authors: Abood E S , Naser M S , Abed A S , Salman H I 
Published: October 2021

Abstract
Alternative, low-cost, high-Precision, and selectivity methods Anew homework ion selective electrodes ISE for zinc metal determination and comparison between size particles in sensitive and selectivity. A hydrothermal method used to prepare zinc oxide nano particles, and use Scanning electromagnetic method TEM for morphology and determined size of ZnO-NPs. and study the redox of Zn+2 in pharma drugs by cyclic voltammetry. (Epa - Epc) > 200 mV, refer to the quasi-reversible mechanism. Physical and chemical properties was study for the electrode in the range of temperature 10-40 °C. voltammograms data showed the negative shift with temperature increased, Diffusion coffining 1.01 x 10-7 was calculated from Sevcik-Randles equation. Rate constant Kox (oxidation) was determined 0.43 ×10-7 and reduction equal 0.31×10-7. The peak current of zinc concentration in the range of 1.0-10.0 ppm showed increased linearly.
Molecular dynamics study of tensile-compressive behavior of silicon steel single crystal
Authors: Huang G , Zhang Q D , Li H 
Published: October 2021

Abstract
In this paper, molecular dynamics was used to model and simulate the silicon steel single crystal. The stress-strain curve of silicon steel single crystal in the process of tension and compression and the evolution law of single crystal structure defects in the process of tension and compression were studied. The results show that the tensile strength and compressive strength of the silicon steel model are not similar, the compressive strength is significantly higher than the tensile strength. The compressive strength is about 2 times of the tensile strength. This conclusion is qualitatively verified through macro experiments. The cluster defects and stress show a positive correlation. The number of dislocations in the compression process is more than that in the tension process, but the dislocation size is smaller than that in the tension process. The research in this paper will provide theoretical support for residual stress detection and reduction.
Effect of different inlet pressures on the temperature field, velocity field and pressure field of a vortex tube
Authors: Xu Q J , Xie J 
Published: October 2021

Abstract
In view of the wide application of vortex tube (VOTU) in the market, and in order to enhance the capability of VOTU in the higher inlet pressure, three-dimensional numerical simulations were performed with existing experimental data and models to analyse the flow fields of VOTUs at different pressures. With the increase of pressure, the maximum temperature of the VOTU rises rapidly and the minimum temperature decreases smoothly. Meanwhile, when the VOTU works under high pressure, the wall thickness and sealing degree of the VOTU design should be increased accordingly, while the inner wall of the VOTU should be made of wear-resistant material to avoid the wear of the VOTU caused by the long-term scouring of the high-speed airflow.
Investigation of penetration forces during tufting of stacked carbon-fibre preforms
Authors: Norouzi S , Noerpel F , Matschinski A , Drechsler K 
Published: October 2021

Abstract
This study investigates the penetration forces during tufting of stacked dry carbon non-crimp fabrics (NCF). The stacked material with a thickness between 20 to 60 mm is made of several quadriaxial [0°/+45°/90°/-45°] NCF layers that are tufted at frequencies up to 2.3 Hz. Furthermore, the effects of the preforming process, the frequency of tufting and the thickness of specimen on the needle penetration force are investigated. Lastly, digital image correlation (DIC) is applied to study the displacement of the fabric during the unthreaded tufting of material. Future work will involve the integration of the experimental results into the simulation of the tufting process.
The Understanding of Undergraduate Physics Students Regarding the Super Blood Moon Total Lunar Eclipse Phenomenon May 26, 2021
Authors: Suprapto N , Yanti V K 
Published: October 2021

AbstractWednesday, May 26, 2021, a total lunar eclipse phenomenon known as the Super Blood Moon occurred in almost all parts of Indonesia. The community gives various perceptions about this phenomenon. Therefore, a more in-depth research is needed. This study aims to determine and analyse the level of understanding of physics students at the Universitas Negeri Surabaya regarding the phenomenon of the Super Blood Moon Total Lunar Eclipse and to determine the level of knowledge of physics undergraduate students regarding the differences in the wonders of Supermoon, Super Blood Moon and Super Blue Blood Moon. This research was conducted using qualitative methods. This study involved twenty-five students majoring in physics at the Universitas Negeri Surabaya using an online questionnaire. Respondent's opinion from the questionnaire was then grouped into four levels of conditions adapted from Posner et al., the four levels of conditions were Dissatisfaction, Intelligible, Plausibility, and Fruitfulness. The results showed that undergraduate physics students' understanding of the lunar eclipse phenomenon was at the level of dissatisfaction while understanding the differences in the wonders of Supermoon, Super Blood Moon, and Super Blue Blood Moon was at the level of Plausibility.
Evaluation of Soil Compaction Characteristics at a Construction Site in Al-Khalis City, Northeast of Iraq
Authors: Hassan Asem A. 
Published: October 2021

Abstract
Soil compaction characteristics namely optimum moisture content and maximum dry density are frequently used as criteria to control field compaction specifications. This study aims to evaluate the compaction characteristics of soil at a construction site located in AL-Khalis City, northeast of Iraq. Ten soil samples were collected from the study area; five samples were augured to perform the Standard Proctor compaction tests to investigate the relationship between the moisture content and the dry density of the soil. A core cutter method was implemented to collect additional five samples used to determine the field dry density of soil and to calculate compaction ratio. The results showed that optimum moisture content values were ranged from 15.4 to 22.5% while maximum dry density values were ranged from 1.63 to 1.83 g/cm3. The effect of the compaction effort on the compaction curves was investigated. Increasing the compaction effort increases the maximum dry density and decreases the optimum moisture content of the soil. In addition, a linear relationship between the maximum dry density and optimum moisture content (correlation coefficient R2=0.937) is noticed. This relationship is compared with similar relationships from the literature. Finally, compaction ratio, commonly used to evaluate compaction specifications, was calculated. Compaction ratio values indicate that the soil was compacted at the site to satisfactory ranges suitable for engineering construction work.
Study of Iron Oxide Nanoparticles Doped with Manganese for Catalytic Degradation of Methylene Blue
Authors: Amiruddin Erwin , Awaluddin Amir , Sinuraya Salomo , Hadianto Heri , Noferdi Muhammad Deri , Fitri Ainun Syarifatul 
Published: October 2021

Abstract
Modification of iron oxide nanoparticles by doping with transition metals has been intensively reported and many applications have been proven. Magnetic and structural properties, and the catalytic activity of undoped and manganese doped iron oxide nanoparticles for degradation of methylene blue have been studied. Preparation of undoped and manganese doped iron oxide nanoparticles was done by ball milling method using Logas natural sand as raw materials. The magnetic properties of the samples were determined using vibration sample magnetometer (VSM). A detailed analysis of the loop hysteresis reveals a reduction of saturation magnetization of the samples towards higher manganese-doping concentration (wt.%). The reduction in magnetization from 13.25 to 11.67 emu/g and enhanced the coercivity on manganese-doped samples from 224.35 to 352.18 Oe are observed to produce an improvement in the catalytic activity for manganese doped iron oxide nanoparticles compared to undoped samples. Catalytic activity of undoped and manganese doped iron oxide nanoparticles in the degradation of methylene blue was studied through ultraviolet visible spectroscopy (UV-Vis). Manganese doped iron oxide nanoparticles exhibit better catalytic activity for degrading methylene blue (88.880%) compared to that for undoped iron oxide nanopartices (81.805%) for 300 minutes reaction time.
Interactive E-Module of Integrated Science with Connected Type as Learning Supplement on Energy Topic
Authors: Linda Roza , Mas’ud  , Zulfarina  , Putra Teja Pratama 
Published: October 2021

Abstract
Development of an interactive e-module of integrated science with the Connected type on energy topic for Junior High School (SMP) aims to develop an interactive e-module of integrated science that includes biology, physics, and chemistry concepts an interrelate unity in energy topics. That expected to strengthen the student concept knowledge. The Research and Development (R & D) design with the Plomp model was employed. Collection data procedures used validation sheets and user responses questionnaires by the validator team, teachers, and students. Assessments involved material substance, learning design, display (visual communication), and software utilization. Data analysis results showed the validation percentage from the material and media experts are 94.99% and 96.96%, with very valid criteria. Through the teacher's responses, obtain 95.00% (very good practicality criteria). The 92.45% on the one and one test and 92.71% on the small group test, both on very interesting criteria from students. Its means, the interactive e-module has been valid and suitable for use in the learning process.
Temperature Characteristics of Post-Harvest Technology Equipment Based on Biomass Waste Energy Using the Internet of Things Telecontrol System
Authors: Muhammad Juandi , Risanto Joko , Gimin  
Published: October 2021

Abstract
Technological innovations based on the internet of things have been designed, this technology is very suitable to deal with New Normal conditions (Covid 19). This internet of things-based technology tool has been tested on a laboratory scale to produce a prototype tool, which is ready to be implemented on an industrial scale. Biomass-based post-harvest technology innovation with the internet of things system, Stages of research methods to achieve goals. The first stage is to design a technological innovation design, to design an internet of things work system, to test the results of the tool design on a laboratory scale. The results of the characteristic test of this technological tool using coconut shell biomass waste with variations in the number of shells, 6, 8, 10 and 14. The results of the temperature characteristics in the drying chamber show that there is a linear relationship between the maximum temperature results produced and the number of coconut shells. Temperature results data can be viewed via an Android phone or based on the Internet of Things (IoT).
Fusion and Elongation Method Integrated with Vacuum System to Fabricate Single-Mode Fiber Couplers
Authors: Irawan Dedi , Azhar  , Sutoyo  , Mustakim  , Saktioto  
Published: October 2021

Abstract
Abstract. The single mode fiber coupler has been successfully fabricated in various power ratio based on fusion and elongation method. Two single mode fibers were joined by heating them under the torch flame injected by H2 Gas with the temperature range of 1200°C - 1500°C. Coupling mode theory was determined to simulate the power characteristics of the fiber coupler which is then combined with the experimental results. The measurement of power output characteristics shows that good agreement between power ratio characteristic of experimental and theoretical simulation was obtained when the elongation process runs with a pulling speed of 180 μm/s. However, good performance of fiber couplers interm of coupling loss with typical of 0.05 dB has been obtained by integrating a vacuum system as the fiber holders inside the slot of pulling stages. Experimental results found that the suitable pressure of vacuum system operating during heating process is 120 mbar.
The Effect of Hydrogen Peroxide on Catalytic Activity of Manganosite MnO/Oil Palm Fly Ash Catalyst for Degradation Methylene Blue
Authors: Sandani Yunisa , Nurhayati  , Amirudin Erwin , Anggraini Riska , Siregar Siti Saidah , Awaluddin Amir 
Published: October 2021

Abstract
Dye pollutions have become a major environmental problem due their mutagenic, carcinogenic nature, toxicity and stability. The effective removal of this recalcitrant material from wastewater requires immediate solution. The Fenton-based advanced oxidation processes have been considered as highly effective and efficient method for the degradation of highly stable organic contaminants. In this work, the composite MnO/oil palm fly ash (OPFA) was first synthesized, characterized and applied as a heterogeneous Fenton catalyst for the degradation of methylene blue (MB). The composite was characterized by X-ray powder diffraction (XRD), and Brunauer–Emmett–Teller (BET). The XRD result indicated that the manganese oxide phase in the composite is the rock-salt manganese oxide of manganosite MnO. The MnO/OPFA has a surface area of 278.541 m2/g, which is much higher than those of pure manganosite or OPFA. The catalytic test indicated that the concentration of hydrogen peroxide (H2O2) seems to play a significant role for the effective degradation of MB. The degradation of MB was 95.31 achieved only within 10 minutes of reaction time with the addition of 5 ml of H2O2, 125 mg catalyst using 100 ml 12.5 ppm MB.
Supercapacitor Cell Electrodes Derived from Nipah Fruticans Fruit Coir Biomass for Energy Storage Applications using Acidic and Basic Electrolytes
Authors: Farma Rakhmawati , Lestari Ade Nur Indah , Apriyani Irma 
Published: October 2021

AbstractThe performance of the supercapacitor is influenced by the pore distribution on the electrode surface and the conductivity, mobility, ion size properties of the electrolyte to achieve a high specific capacitance value. Carbon electrodes are synthesized from Nipah fruit coir (NFC) biomass through a pre-carbonization process, chemical activation by varying the molarity of KOH of 0.2 M, 0.3 M, and 0.4 M, and the pyrolysis process. The electrochemical properties of supercapacitor cells are analyzed using the cyclic voltammetry method with an electrolyte solution of sulfuric acid and potassium hydroxide which is testing through an asymmetrical two-electrode system. The results showed that the increase in the performance of supercapacitor cells occurred in the electrolyte in an acidic environment with the highest specific capacitance value of 214.31 F/g compared to the electrolyte in an basic environment with the highest specific capacitance value of 164.54 F/g. The results of the analysis of electrochemical properties indicate that carbon electrodes made from Nipah fruit coir biomass can be a suitable material for energy storage applications.
Pb Doping in Silicene Nanoribbons in the Presence of an External Electric Field
Authors: Van Ngoc Hoang 
Published: October 2021

Abstract
Silicene nanoribbons (SNRs) are one-dimensional materials that have been extensively studied in recent years. The SNRs studied here have hydrogen-modified edges, having 12 silicon atoms and 4 hydrogen atoms per unit cell. In the work of doping Pb in SNRs, three configurations have been studied as top configuration, valley configuration, and one-to-one configuration. Research has shown that Pb doping is responsible for the change in band gap and state density of the system. The appearance of the electric field is also the cause leading to the change in the energy band structure of the doped system. The work uses density functional theory (DFT) to study, the formation energy of the system is calculated based on this theory. The doped structures are stable after optimization.
Design and Development of E-learning Devices Based on Massive Open Online Course (MOOC) on Static Fluids Material
Authors: Febrian Andika , Yennita  , Ma’ruf Zuhdi , Zulirfan  
Published: October 2021

Abstract
E-learning devices based on MOOC is a learning device product that is integrated with a Massive Open Online Course system that is available through a web platform/application provider via Moodle. The learning devices consisting of lesson plans, LKPD, and learning assessments are also equipped with various content and other interesting features. The purpose of this study is to produce a valid and feasible e-learning learning device so that it can be used in physics learning, especially on static fluid material. This learning devices that is integrated with MOOC is expected to make it easier for teachers and students in teaching and learning activities, so that learning continues to be interesting and effective even though online. This type of research is Research and Development (R&D) using a 4D development model. The research instrument used in this study was a learning device validation sheet consisting of lesson plans, student’s worksheet, and learning assessments that were assessed by the validators to assess the feasibility of the product. The data in this study is quantitative data by showing the results of research on the design and development of e-learning devices based on MOOC on static fluids material which is declared valid with a score of 3.46 (high category). Thus the product of this learning device can be declared worthy of being tested or used in physics learning.
Analysis of Groundwater Infiltration using the Schlumberger Geoelectric Method
Authors: Juandi M , Santoso S A 
Published: October 2021

Abstract
Groundwater is one of the best water resources for clean water, which can be used to meet the needs of people's lives, such as household, irrigation, and industrial needs. Based on the theory that changes in land use will have an impact on groundwater absorption. This study aims to see and analyze underground water absorption around the gate of the University of Riau using the geoelectric method of the Schlumberger configuration. Based on the results of measurements of resistivity values and groundwater infiltration in the Gate area of Riau University, Simpang Baru, Tampan, Pekanbaru, Riau, it is interpreted for the soil layer obtained with resistivity values ranging from 235.38 Ohm-m to 595.66 Ohm-m with a depth of obtained up to 35 m, and for the interpretation of lithological layers, namely clay, distribution of gravel, sandstone, and sand and gravel. The underground water infiltration value obtained from the calculation results is that for the clay layer is 13.42 m3/year, the gravel distribution layer is 13.42 m3/year, the sandstone layer is 40.27 m3/year and the sand and gravel layer is 40.27 m3/year.
Design and Development of a Website-based Palm Oil Industry Liquid Waste Monitoring System
Authors: Rahayu Yusnita , Wijaya Jodi , Safrianti Ery , Feranita  , Nasution Salhazan , Suwitno  
Published: October 2021

Abstract
Liquid waste produced by palm oil mills needs to be monitored regularly to avoid pollution and negative impacts of waste before being discharged into rivers. Monitoring of pollution levels of palm oil effluent is carried out in wastewater disposal ponds. In this study, a website-based prototype of a palm oil effluent monitoring system was designed and built. This prototype monitors the level of pollution of liquid waste in the liquid waste disposal pond. Monitoring the level of pollution of this liquid waste takes a sample of waste at one of the palm oil mills located in Kuantan Singingi, Riau. This research uses a pH sensor and a water turbidity sensor. Provision of calcium oxide is carried out if the level of acidity of the liquid waste and the level of turbidity of the liquid waste is in poor condition. The measurement results are then displayed directly on the website that was built. From the results of field tests, it was found that the liquid waste is very acidic, so it is necessary to add calcium oxide to reduce the acid content.
Dynamic Modeling of Tannase Production from Bacillus cereus: A Framework Simulation based on Fed Batch Strategy
Authors: Mendoza D , Niño L , Gelves G 
Published: October 2021

Abstract
Tannase enzyme is a metabolite of great interest in the industry. Typical examples of its use can be found in wines and beer production, beverage and juice fruits clarification and leather production. However, tannase production on an industrial scale is limited to the operation batch mode. For this reason, its production is low and severe limitations take the place of being carried on a large scale. To improve production, this research proposes an operation strategy based on Fed-batch mode. The kinetic constants were taken from the literature to simulate trends obtained through a Feed-batch mode of operation. One of the most important findings of this research focuses on increasing tannase production with found values of 0.380 U/g. The latter indicates that tannase production could be almost twice the concentration obtained with the traditional batch mode (0.1900 U/g). Results obtained in this research may be promising for the enzyme production industry. Using computational techniques, it is possible to identify an improvement without investing in excessive experimentation and resources.
Coconut Fiber Extraction using Soda Pulping Method as Green Corrosion Inhibitor for ASTM A36 Steel
Authors: Zultiniar  , Sandy Muhammad Kurnia , Wibowo Ervan , Heltina Desi , Komalasari  
Published: October 2021

Abstract
Currently, the corrosion inhibitor is a method that is widely used to control the corrosion rate of inner pipe in the chemical industry. This study aims to utilize coconut fiber as a green inhibitor, determine the effect of adding inhibitor concentration, immersing time, and determine the inhibition efficiency of coconut husk extract. The extraction method used is the soda pulping method with a solid to liquid ratio of 1:8 (w/v). The method used for testing the corrosion rate is the weight-loss method, UV-Vis Spectrophotometry and FT-IR are also used to analyze the lignin produced. The lowest corrosion rate was obtained in 1 M HCl corrosive medium with the addition of 3 g/L inhibitors at 48 hours immersion, which was 49.691 mpy. The highest inhibition efficiency was in 1 M HCl corrosive media solution with the addition of 3 g/L inhibitors at 48 hours immersion, which was 78.11%.
Effect of using different types of Non-Edible Vegetable Oils as Metal Cutting Fluids in Drilling Inconel 718 on Tool Wear and Surface Roughness
Authors: Safie N S S , Murad M N , Lih T C 
Published: October 2021

Abstract
Inconel 718, a thermal-resistant nickel-based alloy, is used extensively in the aircraft industry. Due to the high toughness and work hardening properties, the use of metal cutting fluids (MCF) in machining operations is very significant. The application of the MCF to the cutting zone can minimize heat generation and reduce wear rate at the cutting edge. Surface roughness is often considered as a quality indicator for the finished or semi-finished product. This research evaluates the performance of non-edible vegetable oils which are castor and rice bran oil towards the tool wear and surface roughness. The drilling experiments were conducted using coated (TiAlN) carbide drill at various cutting speeds of 10 and 20 m/min and a constant feed of 0.015 mm/rev. The results of this research reveal castor oil outperformed rice bran oil in reducing tool wear and improved surface roughness.