bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of Alteration Geochemistry and Mineralization in the Jawara Field, Jember Regency, East Java Province
Authors: Widiatmoko F R , Kusdarini E , Irwanto M A , Zamroni A , Sunan H L , Putri R H K 
Published: December 2021

AbstractThe Jawara Field in Jember Regency is a location where it is indicated that there are precious metal deposits in the form of porphyry type Gold and Copper. In this study, the focus is more on the search for metal mineral deposits related to the elements of Gold (Au) and Copper (Cu), namely the metal mineral chalcopyrite (CuFeS2) as the main carrier minerals for Au, Cu, Ag, as impurities. The results of alteration products in the form of weathered minerals are also the focus of research. The analysis used to detect metallic element content and the presence of metallic and non-metallic minerals is by petrographic analysis, mineragraphy analysis, sediment grain analysis and geochemical analysis. Based on the results of the mineragraphy analysis, it was proven that the metal mineral chalcopyrite was found in the JAFA 6 BPS sample which is a carrier mineral for the metallic copper element and silver was also found in JAFA 2 ALT. In addition, the results of the sediment grain analysis also found metal mineral grains and metal elements, namely copper and iron elements in all JAFA samples. The results of petrographic analysis show that the weathered minerals in the form of kaolinite, alunite, and smectite are products of hydrothermal alteration activities. Based on these results, the research area is divided into 3 alteration zones, namely potassic, propylitic, and argillic alteration zones. The results of the geochemical analysis showed that the highest levels of copper were found in JAFA 5 as much as 13.9 ppm and the highest levels of iron in JAFA 6 were 390.8 ppm. From the results of the analysis, it can be concluded that it is true that there are metal mineral deposits and metal elements in the form of sediment grains and porphyry-type Au and Cu elements.
Study of Hydrothermal Alteration and Mineralization in the Lahbako Field, Jember Regency, East Java Province
Authors: Widiatmoko F R , Sari A S , Ramadhanty J A N , Putri R H K 
Published: December 2021

Abstract
Administratively, the research location is in Lahbako Field, Jember Regency, East Java Province. This study discusses the geological characteristics, hydrothermal alteration, and mineralization in the study area. The method used is field data collection by mapping and laboratory analysis in the form of petrographic analysis and mineragraphic analysis. The research area is divided into three geomorphology units, namely a unit with steep hills, a unit with undulating hills, and a unit with sloping plains. The stratigraphy of the study area is divided into five-rock units, while the order of rock units from oldest to youngest is the volcanic Breccia unit, the intercalated Sandstone, and Claystone unit with Tuff insertion, the Diorite Intrusion Unit, the Granodiorite Intrusion Unit, and the youngest unit, namely Alluvium Unit. The research area has a high straightness density value and a straight lineage pattern that tends to be dense. The area with high lineament density is assumed to be the area with the best prospect of alteration and mineralization because the lineament reflects the geological structure which is the path of hydrothermal fluid passage that causes alteration and mineralization. Based on petrographic analysis, the research area has undergone alteration with the type of Philic alteration (Chlorite-Quartz-Feldspar), Prophiliic Alteration (Chlorite-Quartz-Feldspar) Feldspar-Quartz-Epidote) and Argillic Alteration (Alunite-Quartz-Biotite). The study area is indicated as an area with high sulfide epithermal mineral deposits where the indication is based on the discovery of vein textures in the form of Vuggy Quartz and ore minerals in the form of Silver, Copper, and Iron in mineragraphic analysis.
Harmonics Analysis of Inverter Circuits on Smart Grid System
Authors: Sulistyowati R , Widiatmoko D , Sujono H A 
Published: December 2021

Abstract
Smart Grid System has Harmonics Distortions. Caused when switching inverters convert DC current into AC that lowers power quality and affects power generation system. Interference occurs in sinusoidal wavelengths of voltage or system currents that have frequency multiples of fundamental frequencies. Therefore, analysis is required based on IEEE Std 519-2014 standard which is for 20kV Bus voltage has a limit value of 3% for VIHD and 5% for VTHD, using ETAP software was conducted simulating the condition of the non-grid bus system has a VTHD value of 4.9%, while the on-grid system conditions that have inverters for buses have a VTHD value of 5.81%, and simulations before passive filters are installed in the 5th order (f = 250 Hz) with a VTHD value of 6.33%; VIHD 4.82% after installing passive filter VTHD value 1.88 %; VIHD 0.00 %, while in the 7th order (f=350 Hz) the VTHD value is 6.33%; VIHD3.33 % after installing passive filter VTHD value 1.88%; VIHD 0.00%. The passive filter used is a single tuned passive filter. Change the PF (Power Factor) value before filtering is installed on the distribution bus = 82.9%, after the passive filter installed is 88.1%.
Prototype of an Automatic Entrance Gate Security System Using a Facial Recognition Camera Based on The Haarcascade Method
Authors: Suryowinoto A , Herlambang T , Tsusanto R , Susanto F A 
Published: December 2021

Abstract
This article aims to test a facial recognition-based front door security system, which can also convey relevant information to the owner’s mobile phone via an SMS gateway. This system is necessary to prevent unwanted criminal activity by the owner. The method used is Hercascade as face recognition for security. Use a set of webcam settings to compare human face objects in the background with face data already stored in the database. Capture images using a Raspberry PI connected to a USB webcam for the sensor, move the front door using a servomotor as a drive, and own the system in the form of a short message from basic communication process data Notify to. There is also an ultrasonic sensor as an activation system to detect human objects when they approach the door and invade. Based on the results of 90 tests on a system with varying distances of objects on the camera (30 cm, 40 cm, 50 cm), the average pass rate of the tests is 91.11%. We can conclude that face recognition by the Hercassette method can be applied as an entrance security system.
Microstrip Antenna Design with Array Rectangular Patch 2x2 for Ship Radar at 2.2 GHz
Authors: Santoso A D , Cahyono F B , Suwondo I , Arleiny  , Harianto B B 
Published: December 2021

Abstract
This antenna uses FR4 substrate material with a substrate material thickness of 1.6 mm. The simulation results of the patch array microstrip antenna rectangular 2x2 elements with substrate material are FR4 able to work at a frequency of 2.2 GHz, with a frequency range of 2.1607 – 2.24 GHz, a return loss value of -18,086 dB with a bandwidth of 83.6 MHz, VSWR 1.284, the gain of 4.714 dB and beam width of 53.6 deg, these results will be compared with a single rectangular antenna and array antenna rectangular 1x2 that work at the frequency same of 2.2 GHz with range frequency of a single antenna 2.161 – 2.222 GHz, the return loss value - 13,934 with a bandwidth of 61 MHz, VSWR 1,502, a gain of 2.1988 dB and a beamwidth of 94.9 deg. As for the 1x2 array antenna, the value working range is of frequency a single antenna 2.164 – 2.247 GHz, the return loss value is -20.3717 with a bandwidth of 83 MHz, VSWR 1.21, a gain of 4.58 dB, and a beamwidth of 81.7 deg.
Automatic Fault Location Identification and Isolation Method for Smart Distribution Network in Surabaya City
Authors: Rohiem N H , Soeprijanto A , Penangsang O , Putra N P U , Defianti R , Suheta T 
Published: December 2021

Abstract
There are various types of fault that can occur in the distribution system network, so it is necessary to identify the location of the fault and isolate the fault in the area of the fault. The city of Surabaya is in preparation for the development of a smart city, so it is necessary to prepare a smart distribution system network system that can identify locations and isolate disturbed areas automatically. This paper describes the reconfiguration process to improve the value of losses in the system which results in a decrease in the value of total line losses after reconfiguration of 313.46 kW from 8 scenarios and includes the effect of adding solar energy to the existing network. The process of identifying the fault location and the isolation process on the Surabaya distribution system network in this paper uses the deep learning method. The fault location is determined based on the voltage and current profile of each bus in the system, while the isolation process is carried out by opening the switch closest to the fault area. In this process, deep learning can provide accurate fault location and isolation results for 6 fault tests.
Determination of Service Priority Areas as an Effort to Increase Urban Solid Waste Service Coverage (Case study Ngawi Regency)
Authors: Alfiah T , Yustiani Y M 
Published: December 2021

Abstract
Limited budget and infrastructure require that a selection be made, which areas prioritize solid waste services. The priority of waste services is determined based on the results of the assessment of the interest scale matrix of the service area. Regions with the highest matrix scores receive priority, followed by sites with lower scores. This study aims to determine the importance of increasing the solid waste service area in Ngawi district, with 19 sub-districts. The results showed that the Ngawi sub-district, as the district capital, Ngawi sub-district was the priority to improve solid waste services, followed by Kedunggalar, Karangjati, Mantingan, and Padas sub-districts.
The syntheses of poly (diethylene glycol adipate) in low-intensity ultrasound
Authors: Zarembo V I , Pankov S A , Zarembo D V , Yu Sokolov V 
Published: December 2021

Abstract
Poly (diethylene glycol adipate) is an important product of chemical technology. Several grades of polyesters (P-9, P-9A) are produced in the industry, in which poly(diethylene glycol adipate) is the main component. These composites are used in production of binders of mixed rocket solid fuels, as well as consumer goods. Poly(diethylene glycol adipate) is obtained by polycondensation of diethylene glycol and adipic acid. Usually, the polycondensation is carried out using catalysts. The use of catalysts complicates this process: requires further purification process or in solvent free system might slow reaction rate due to the limiting diffusion between reactants and mass transfer limitations. Therefore, it was proposed to use low-intensity ultrasound, which allows to influence the kinetics of the process without complicating the system. In this work, the reaction of polycondensation of diethylene glycol and adipic acid in low-intensity ultrasound was studied. The results of applying low-intensity ultrasound to the preparation of poly(diethylene glycol adipate) showed an increase in the reaction rate of the formation of a high-molecular compound and a change in the thermal regime. Application of low-intensity ultrasound provides synchronization of vibration and rotation of self-organizing dissipative structures, which leads to the decrease in energy consumption for mass transfer, thereby increasing the reaction rate. The low-intensity ultrasound demonstrated to be an effective method to intensify the polycondensation reaction.
Research results of solid particle erosion resistance of 20GL steel with boriding
Authors: Tkhabisimov A B , Zilova O S , Kalakutskaya O V 
Published: December 2021

AbstractThe paper presents the results of experimental studies of solid particle erosion resistance of 20GL structural steel samples with two different variants of surface modification based on the boriding process. Characteristics of modified layers such as depth, composition, microhardness were determined. Tests were carried out according to ASTM G76-13 standard at air-abrasive flow rate of 170 m/s, flow attack angles of 30º and 90°, sample surface temperature of 25ºC. It was found that both considered options of surface modification at an angle of attack of 90 ° flow do not worsen the abrasion resistance of 20GL steel samples, and at flow attack angle of 30 ° increase not less than 8 times. A change in the wear pattern of boriding samples with an increase in the angle of attack from 30° to 90° is noted. As after the boriding process surface embrittlement was observed, the angle of maximum wear for 20GL steel with boriding became equal to 90° in contrast to steel without treatment, where the maximum level of wear is observed at 30°. Thus, the change of fracture type from plastic to brittle was revealed, which should be taken into account in full-scale operation of the treated parts. The obtained results indicate that the process of boriding of pump parts made of 20GL steel will increase their solid particle erosion resistance and extend their overhaul period.
Friction surface modifiers of carbon-containing material for high-temperature operation
Authors: Roshchin M N 
Published: December 2021

Abstract
The results of high-temperature tribological tests of carbon-containing material in friction on heat-resistant stainless steel 40X13 in the temperature range from 20 to 700 °C under atmospheric conditions are presented. Friction surface modifiers “Argolon-2D” material improve antifriction properties and decrease friction coefficient value. Friction coefficient when using Ni-Se-PTFE modifier at load of 0.67 MPa and speed of 0.16 m/s is less by 5% than at speed of 0.05 m/s, and at speed of 0.25 m/s friction coefficient is less by 13% than at speed of 0.05 m/s. At 500 °C and a load of 0.67 MPa the friction coefficient when using Ni-Se-PTFE modifier is 30% higher than when using InSb-PTFE modifier, and the friction coefficient when using CuO-PTFE modifier is 1.2 times higher than when using InSb-PTFE modifier.
Microstructure of the coating obtained by magnetron sputtering of a Ni-Cr-B4C composite target
Authors: Zaitsev S V , Prokhorenkov D S , Ageeva M S , Skiba A A 
Published: December 2021

Abstract
This paper presents data on obtaining a composite coating by radio frequency (RF) magnetron sputtering of a Ni-Cr-B4C composite target in an inert gas (argon) environment. To make the target, Ni-Cr-B4C composite powder was applied to the copper base of the target by detonation gas-thermal spraying. The obtained targets served as a source of coating material during high-frequency magnetron sputtering. This method of coating production ensures the reproducibility of their properties, as well as the uniformity of coating thickness and good adhesion to various target backings.
The data of the study of the structure and morphology of the composite coating are presented. The resulting composite coating Ni-B/Cr7C3 with a thickness of 2 microns has a dense homogeneous structure with expressed textured polycrystallinity. The surface of the resulting coating is represented by nanoscale and homogeneous grains. There is no columnar crystal growth in the coating, which has a positive effect, as the columnar structure reduces the mechanical characteristics of the coatings due to faster oxygen diffusion along the grain boundaries. It is established that the combined use of the Ni-B and Cr7C3 binary phases in composite coatings leads to an increase in operational properties.
Comparison of the corrosion behavior of the TiNi alloy in the coarse-grained and ultrafine-grained state
Authors: Kayumova E M , Churakova A A , Latypov O R 
Published: December 2021

Abstract
This article studies the corrosion behavior of the TiNi alloy in the coarse-grained and ultrafine-grained states. The study of the influence of the initial microstructure on the corrosion behavior of the TiNi alloy was carried out by the gravimetric method in the NaCl and H2SO4 solution for a month. Studies was shown that as a result of the action of a corrosive medium from a sample in a coarse-grained state, it undergoes greater destruction, pitting corrosion was observed, at the same time, in an ultrafine-grained sample only traces of corrosion products are observed on the surface of the samples. Investigations with an inverted light microscope in a dark field made it possible to observe corrosion products and determine their volume fraction. Evaluation of the corrosion rate showed that in the coarse-grained state it is 126 times higher than the corrosion rate in the ultrafine-grained state. Analysis of X-ray phase analysis showed that in the coarse-grained state after corrosion tests, a significant proportion of the TiNiH1.4 phase is observed, while in the ultrafine-grained state all phases correspond only to the TiNi phases. The TiNi alloy contains an Ti2Ni phase enriched Ti both in the coarse-grained state and in the ultrafine-grained state. Moreover, in a coarse-grained state, its share is 2 times higher.
The outlook for regulatory support for adoption of efficient concretes
Authors: Gabitov A I , Ryazanov A N , Salov A S , Biktasheva A R 
Published: December 2021

Abstract
The analysis of data obtained under studying scientific, technical and normative literature in the area of applying efficient concretes, in particular, fiber-reinforced concrete, in the world and national tunnel construction is presented herein. The European regulatory documents, standard metrologically certified methods and procedures for analyzing and testing, laboratory test equipment and measuring instruments are indicated. Steel fiber concrete studies was explored at the Scientific and Educational Center for Innovative Technologies of the Architectural and Construction Institute of the Ufa State Petroleum Technical University. Prism bending tests were made with different fiber content. In addition to laboratory tests, other tests were made in accordance with the Russian standards, where the prisms are tested without a notch. The correlation between the slope of the load-to-displacement curve of the crack mouth (CMOD - Crack Mouth Opening Displacement) and the length of the crack was used in the course of the study. The fiber content enabling to get an average residual bending strength of at least 1.5 MPa at 0.5 CMOD (equivalent to 0.47 mm center deviation) and an average residual bending strength of at least 1 MPa at 3.5 mm CMOD (equivalent to 3.02 mm of center deviation) is found. Statistical distributions of the Grubbs tests are analyzed by methods of statistical modeling. The regulatory framework for fiber concrete is not currently well developed in the Russian Federation, thereby reducing greatly the application of new generation concretes meeting the current knowledge. The application of fiber concrete in tunnel construction will prove to be economically justified and the areas of applying effective materials are to be developed in future with the wide participation of scientific, design, production, construction and other specialized organizations, as well as educational and training centers.
Advanced Electrode Materials for Lithium-ion Battery: Silicon-based Anodes and Co-less-Ni-rich Cathodes
Authors: Chen Xinyu , Yang Wenhan , Zhang Yu 
Published: December 2021

Abstract
The development of higher-performance rechargeable lithium-ion batteries (LIBs) is critical to the substantial development of electric vehicles and portable electronic devices. The cost of lithium-ion batteries needs to be decreased more and the specific energy as well as recycling degradation rate needs to be enhanced further. Silicon anodes and cobalt-free nickel-rich cathodes are widely regarded as promising materials for the next generation of lithium-ion batteries. This review discusses the current state of research on silicon anode nanomaterials and nickel-rich cathode materials without cobalt.
Research on Optimization of Cross-sectional shape for Aircraft Door Rubber Seal
Authors: Yuan Xiuqi 
Published: December 2021

Abstract
Rubber seals are widely used in aircraft door structures, which play important roles on sealing, sound insulation and heat preservation. Aircraft door rubber seals are critical to the normal flight of the aircraft and the safety of the passengers. In this paper, a finite element model of rubber seals for aircraft door with different cross-sections is established. The deformation and stress distribution of the seals under the action of concentrated force and compressive displacement are analyzed, and the calculation results of seals with different cross-sections are compared. The optimal structural form of the cross-sectional shape of the seal is obtained. The research results are of great significance to improve the safety and durability of seals and enhance the sealing performance.
Analysis of influencing factors of data error in chemical analysis of iron and steel materials
Authors: Bai Yanhong , Wu Yun 
Published: December 2021

Abstract
This paper analyzes the influencing factors of data error in chemical analysis of iron and steel materials, including sample preparation factor, sample decomposition factor, analytical instrument factor, reagent factor, analysis method factor. The purpose is to reduce the error of data measurement results and improve the accuracy of data analysis results by studying the measures of eliminating instrument application error, doing a good job in reagent selection, appropriately increasing the number of experiments, strictly following the operation specifications and reasonably using the allowable deviation table.
A Path Planning Method Based on Robot Automatic Grinding of Drills
Authors: Hao Weidong , Tan Chaoquan , Sun Yulu , Zheng Chuan , Jin Jingsen 
Published: December 2021

Abstract
This paper proposes a path planning method for grinding excess material after PDC bit repair using industrial robots. Firstly, a 3D scanning instrument is used to obtain point cloud data of the bit to be ground, secondly, this data are imported into Geomagic Studio for processing to obtain the triangular sheet file of the area to be ground. Finally, the software based on MATLAB is used to process the file and calculate the motion path of the robot end-effector. The generated path is imported into ROS for simulation. By comparing the generated path with the grinding area, it was verified that the generated path could be used in actual operation.
An air insulated linear pulse transformer for electrodischarge technology
Authors: Zherlitsyn A.A. , Alexeenko V.M. , Kondratiev S.S. 
Published: December 2021

Abstract
A linear pulse transformer with air insulation at
atmospheric pressure was created and tested under both constant
resistance and non linear loads. The maximum power of the
transformer output pulse reached ∼500 MW at a matched load with
a charge voltage 50 kV. The transformer transferred ∼60% of
the stored energy to the load over a characteristic time of about
1 μs. The scalability the generator was studied by connecting
two identical transformers in series which gave a power output of
∼850 MW with doubled output voltage and reduced current. The
frequency mode of operation was studied using one and two
transformers with a charge voltage of 50 kV and a load that was,
close to matched. In both cases, the power maximum and jitter
showed no significant changes at any of the frequencies tested (up
to 5 Hz). These results mean that the use of this generator can be
recommended for a wide field of applications due to its scalability
and low internal impedance.