bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Computer Algorithm in Fault Diagnosis System of RM Equipment
Authors: Zhang Xinfeng , Yang Guanglu , Cui Yan , Wei Xinfeng , Qiao Wensheng 
Published: December 2021

Abstract
At present, modern mechanical equipment is gradually developing towards large-scale and intelligent, which leads to more and more complex equipment structure. Therefore, people have higher and higher requirements for intelligent fault diagnosis of mechanical equipment, which leads to the application of various algorithms to mechanical equipment. Among them, rotating machinery (hereinafter referred to as RM) mainly relies on rotating action to complete specific functions, such as gearbox, gas turbine, generator and engine, which are often the core components of mechanical equipment. Therefore, the FSGS (hereinafter referred to as FSGS) of RM equipment has become a very key link in system design and maintenance, which requires designers to constantly overcome the original intelligent diagnosis system. Through a variety of deep learning algorithms, we can improve the diagnosis efficiency of automatic monitoring and diagnosis equipment, which can also reduce the loss caused by untimely diagnosis. Firstly, this paper analyzes the types of application of computer algorithms in the fault body segment system of RM equipment. Then, this paper analyzes an algorithm, which can better improve the diagnosis efficiency of the equipment.
Fast Torque Optimization Technology of Brushless Motor Using ANSYS Finite Element Software and Maxwell2D
Authors: Chen Ping , Chang Xiangran 
Published: December 2021

Abstract
In recent years, due to the large-scale research and development of brushless DC motor and the gradually mature technology, the distribution range of its drive system in industrial production has also expanded, and has gradually become the development mainstream [1] in the field of industrial automation. With the continuous development of industry, the motor control has also emerged more and more ways [2]. The operation principle of external rotor brushless motor is studied, a typical 12-slot 14 extremely concentrated winding UAV motor is described, and the optimization design of tooth groove torque and torque pulse is analyzed. Using ANSYS finite element software and Maxwell2D magnetic field, Optislang compares the sensitivity of different pole arc coefficients, negative length, and the simulation results show the effectiveness of the optimization method to provide effective basis for motor optimization design.
Research on Computer Aided Test System for Sealing Characteristics of Hydraulic Support Pure Water Hydraulic Cylinder
Authors: Huang Yuanzhi 
Published: December 2021

Abstract
The sealing characteristics of the hydraulic cylinder in the hydraulic support will have an momentous implication on the safety and reliability of the whole system. The traditional test methods of the sealing characteristics of hydraulic support pure water hydraulic cylinder have many shortcomings, such as single means, complex process, poor accuracy and low efficiency. Based on this, this paper first analyzes the sealing principle and function of hydraulic support pure water hydraulic cylinder, then studies the CAT system of hydraulic support, and finally gives the design and utilization process of CAT system for sealing characteristics of hydraulic support pure water hydraulic cylinder.
Features of anodic plasma electrolytic treatment of an ultra-light alloy of the Mg-Li system in an aqueous electrolyte
Authors: Tambovskiy I V , Krit B L , Kusmanov S A , Perkov A S , Morozova N V , Medvetskova V M , Vdovichenko R A , Palenov I R 
Published: December 2021

Abstract
The possibility of plasma electrolytic treatment of an alloy of the Mg-Li system in an aqueous solution of ammonium chloride, ammonium nitrate and boric acid has been studied. The specific features of the process in the voltage range from 10 to 600 V are determined. The current-voltage and voltage-temperature characteristics during alloy processing are shown, as well as the effect of the processing time on the temperature of the samples. Plasma electrolytic boronitriding of the alloy can be carried out to study the efficiency of the technology at avoltage of 240 V, which corresponds to a sample temperature of 300 ± 10 °C.
Cathodic boriding and anodic polishing of medium-carbon steel by plasma electrolysis
Authors: Korableva S S , Palenov I R , Naumov I M , Smirnov A A , Kusmanova I A , Gorokhov I S , Belov R D , Sokova E V , Bestchetnikova K I 
Published: December 2021

Abstract
The possibility of cathodic plasma electrolytic boriding of medium-carbon steel in an aqueous solution of ammonium chloride and boric acid followed by anodic plasma electrolytic polishing in an ammonium sulfate solution on the same equipment with a change in the operating voltage is shown. The morphology and roughness of the surface, microhardness of the modified layer have been investigated. Wear resistance was studied under dry friction conditions. It has been established that cathodic boriding at 850 °C for 5–30 min leads to the hardening of the surface layer up to 1050 HV with an increase in roughness by 1.5–2.5 times and wear resistance by 3.5 times. Subsequent anodic plasma electrolytic polishing of the boriding surface leads to a decrease in roughness with an increase in wear resistance by 2.3 times.
A comparative study of the effect of ions of different atomic masses on the magnetoresistive properties of Co90Fe10/Cu superlattices
Authors: Gushchina N V , Shalomov K V , Ovchinnikov V V , Bannikova N S , Zavornitsyn R S , Milyaev M A 
Published: December 2021

Abstract
The effect of inert gas ions with different atomic masses (Ar+, Xe+) on the magnetoresistance of Co90Fe10/Cu superlattices deposited on a silicon substrate has been investigated by comparison. The Ar+ ion irradiation has been found to decrease the magnetoresistance more significantly than Xe+ ion irradiation, which seems to be due to a larger average projective range for Ar+ (Rp = 5–6 nm) than that for Xe+ (Rp = 3.3–4.3 nm) and, accordingly, a greater depth of the atom mixing zone (∽(2–3)×Rp) when ions move from the top layers of the superlattice toward the substrate.
Development of a method for calculating the LTEC anisotropy of Zr alloys
Authors: Betsofen S Ya , Speransky K A , Bespalov A V , Alexandrova S S 
Published: December 2021

Abstract
The accuracy of determining the LTEC with respect to metals and alloys with an HCP lattice based on inverse pole figures (IPF) is analyzed depending on the number of experimental points on the IPF using three averaging options: (1) taking into account the irregular arrangement of reflections on the stereographic triangle according to Morris; (2) by the multiplicity factor and (3) with the same weight of each orientation. It is shown that when evaluating the LTEC for semi-finished products with a basal texture, 17 reflections on the IPF are sufficient to provide an error of <1% when using Morris averaging and the multiplicity factor; in the case of a prismatic texture, an error of <1% is provided by all three averaging options, while Morris averaging is minimal.
Electrolytic superconducting niobium coatings for a cryogyroscope rotor: creation and properties
Authors: Okunev M A , Dubrovskiy A R , Makarova O V , Kuznetsov S A 
Published: December 2021

Abstract
Electrodeposition of niobium coatings on spherical substrates for a cryogyroscope rotor made of carbopyroceram was considered. A special design of the installation for obtaining coatings on spherical samples was created. The coatings were applied at a temperature of 750°C with the cathodic current density of 5·10−3 - 2–10−2 A·cm−2 and the electrolysis time of 8-12 h. It was found that the use of a cathodic current density of 2·10−2 A·cm−2 and higher is impractical, because there is a roughening of the coatings surface. The composition of electrolytic coatings was identified by XRD analysis. The macrostructure of niobium coatings was studied using electron microscopy. The concentration of metallic impurities in the niobium coatings was defined by spectral quantitative analysis. The content of gas impurities was determined by gas chromatography. The roughness, nonsphericity, and superconductive properties of niobium coatings were investigated.
Experimental study of the hydrothermal reactivity of oxalic acid under high pressure
Authors: Chen Kefei , Li Yuanju , Zhang Chen , Zhou Shixin , Li Jing , Li Pengpeng , Sun Zexiang , Meng Bingkun , Fu Deliang 
Published: December 2021

Abstract
The thermal stability of organic acids has a close relationship with the formation mechanism of secondary pores in deep reservoirs. Experiments were conducted to investigate the thermal stability of oxalic acid under high pressure and the influence of K-feldspar on oxalic acid decomposition. The experiment temperatures were set in the range of 130-330°C and each experiment was performed for 72h under 60MPa. Results show that both temperature and K-feldspar have significant influence on the decomposition of oxalic acid. The oxalic acid decomposed slowly at temperatures less than 180°C, and most of the oxalic acid decomposed at temperatures between 180°C and 230°C. Besides, the decarboxylation reaction proceeded more slowly in the presence of K-feldspar than the mineral-free experiments, which is most likely attributed to the increasing pH caused by dissolution. In addition, because the decomposition rate of oxalic acid was low, the K-feldspar dissolution was not affected at temperatures lower than 230°C.
Integrated Feed of Improved Grass with Legume-Food Crops for enhancing the Growth Performance of Male Fattening Bali Cattle in West Timor
Authors: Maranatha Grace , Fattah Sukawaty , Nulik Jacob , Lole Ulrikus R. 
Published: December 2021

Abstract
The quality of cattle feed plays a significant role in increasing the performance quality of beef cattle. Most of the farmers are facing constraint to provide the good feed in affordable prices. This research was aimed to determine the effect of given integration feed of improved-legume and food crops to daily weight gain, chest girth, shoulder height and body length of fattening Bali cattle of farmers in West Timor. The research method was arranged as in a double Latin Square Design (LSD), consisted of 5 treatments (T0; local feeds by farmers in West Timor. T1; integration feed of Brachiaria hybrid cv. Mulato + legume Clitoria ternatea + corn + Vigna umbellata + Cucurbita maxima, T2; integration feed of Pennisetum purpureum cv. Mott + legume Clitoria ternatea + corn + Vigna umbellata + Cucurbita maxima, T3; integration feed Setaria sphacelata + legume Clitoria ternatea + corn + Vigna umbellata + Cucurbita maxima, T4; integration feed Brachiaria decumbens + legume Clitoria ternatea + corn + Vigna umbellata + Cucurbita maxima) and 5 periods as replications. The observed responses were weight gain, chest circumference, shoulder height and length of fattening. The observed animals were 10 male Bali cattle that belongs to farmers and with an age ranged between 1-1.5 years and body weight ranged between 101-134 kg (average of 114.25 kg and a coefficient variation (CV) of 6.12%). The results showed that the integrated feed gave a significantly different performance of beef cattle. The most economical composition of integrated feed was the T1 which was able to increase the performance of the cattle compared with the control treatment. This results concluded that the integrated feed fed had a very significant effect on the daily body weight gain, chest girth, shoulder height and body length of the fattened Bali cattle. Economically and the ease of use of feed fed indicated that the composition of T1 treatment gave a greater contribution of 23.53% compared with the control treatment.
Thermal analysis of Indonesian copper sulphide
Authors: Hutabarat Imelda 
Published: December 2021

Abstract
The development of extracting hydrometallurgical process for copper sulphide mineral becomes one of the promising fields, not only for the copper production but also for the production of metal by-products. The advantage of the thermal analysis is to get the phase form of the minerals on a certain temperature. With this result, the chosen metal can be selectively extracted. The goal of this study is to understand the thermal reaction of the copper sulphide as the basic data to develop a process flowsheet of extracting copper and other important metals from the copper concentrates by using an alternative new hydrometallurgy process to increase the value of the minerals. The thermal behaviour was investigated by simultaneous thermal analysis consisting of differential scanning calorimetry (DSC) in combination with thermo gravimetry (TG) and fourier transform infrared (FTIR) spectroscopy. Samples were pre-treated by roasting at the several temperature transitions and subsequently characterized by XRD and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS).
Characterization of perlite and expanded perlite from West Sumatera, Indonesia
Authors: Adi Darmawan Didit , Wahyudi Agus , Eric Mamby Hasudungan , Suherman Ijang 
Published: December 2021

Abstract
As a volcanic country, Indonesia is rich in natural mineral resources. One of them is perlite that is spread across several provinces in Indonesia. One of the companies with a mining business permit (IUP) for perlite is CV Abdi Bersaudara, located at Padang Pariaman Regency, West Sumatra Province. Perlite rock can be processed through comminution and heating method. Crushed perlite can be used as sandblasting, slag coagulant, source of silica, foundry and steel industry, special casting sand and metal finishing. Meanwhile, the expanded perlite is a product of heated perlite with a temperature of 700⁰C-900⁰C. This research aimed to investigate the characters of perlite and expanded perlite from West Sumatra. Qualitative and quantitative analysis was conducted by laboratory experiments and testing, such as atomic absorption spectrophotometry (AAS), X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscope (SEM) and optical microscope (OM). Based on the results of this study, West Sumatera perlite can be used as adsorbents, filter media, filler materials and planting media applications.
Meteorite from Astomulyo Village, Central Lampung, Indonesia: Investigation of its chemical properties
Authors: Harbowo D G , Muztaba R , Malasan H L , Sumardi S , Agustina L K , Julian T , Sitorus J H , Denhi A D A , Sihombing D J P , Mahayu M P , Setyawan D 
Published: December 2021

Abstract
In early 2021, a rare extraterrestrial object passed at high speed, followed by a powerful boom, with a bright flare crossing the atmosphere and falling in Astomulyo Village, Punggur, Central Lampung, Indonesia. This object has been scientifically determining as a meteorite. Toward the spot where we first found it, we presented this object named Astomulyo meteorite. This research investigated its chemical properties using an X-ray fluorescence (XRF) analyzer. As the result, the major composition of this meteorite is Si (28.3-27.1%), Fe (22.1-19.8%), Mg (17.3-15.2%), Al (2.9-2.4%), Ca (1.7-1.9%), and S (1.0-0.97%). Its minor elements are Mn, Ni, Cr, P, and some trace elements such as Co, Ti, Sb, Sn, V, Cd, Zn. This meteorite suggested classifying as the H-Chondrites group. Fe, Ni, Al, and Ti enrichment occur on the meteorite’s surface. It is probably related to this meteorite origin and continuously processes until it falls to the Earth’s surface.
New physical and chemical properties of chitosan-samarium composite: synthesis and characterization
Authors: Prihandini W W , Kusrini E , Prasetyo A B , Prasetyarni N A , Mawarni D P , Sufyan M , Usman A 
Published: December 2021

AbstractChitosan (CHN) is a natural polymer derived from chitin by deacetylation method and has hydrophilic properties. It has been developed by combining it with other compounds to change their surface structures with suitable chemical surfaces and to increase their abilities and activities. Modification of CHN with lanthanide ions can increase its function as adsorbent for heavy metals, removal anions dye, drug conductor, and/or for oil-water separation. In this paper, chitosan-samarium (CHN-Sm) composites were prepared using impregnation method. The concentration of CHN and Sm were also varied and investigated in details. This modification is aimed to produce CHN-Sm composites with new physical and chemical properties. Various ratio CHN and Sm contents from 2:0.3; 2:0.5; 2:1 and 2:2 (w/w) were observed to enhance the hydrophobic characteristic of CHN. Characterization of the CHN-Sm composites were conducted using FTIR, SEM–EDX and fluorescence spectrophotometer. The emission of the CHN-Sm composites showed the characteristic emission of Sm3+ions (4G5/2-6H7/2, and 4G5/2-6H11/2), but also a stronger wide emission band (360–500 nm) of the CHN. Furthermore, the CHN-Sm composites can be used as the active site in adsorbent for separation of water-oil.
Study of production 500 kg/batch polyaluminum chloride from aluminum hydrate
Authors: Mamby H E , Hidayat K N , Wahyudi A 
Published: December 2021

Abstract
Polyaluminum chloride (PAC) is commonly used as a chemical in the water treatment industry, deodorant and paper-making. The PAC is a complex inorganic substance between hydroxyl and aluminum ions that gradually takes place chlorination with its general formula of Alx(OH)yCl3x-y. It has the ability to coagulate suspended solid or dispersed colloid within water perform easily precipitated flock. The raw materials used for manufacturing liquid PAC consists of hydrated alumina (Al(OH)3), hydrochloric acid (HCl), sulfuric acid (H2SO4) and calcium carbonate (CaCO3). A pilot-scale experiment with a capacity of 500 kg/batch feed was conducted by reacting Al(OH)3 with HCl and H2SO4, then neutralized using CaCO3 to obtain liquid PAC and gypsum as a by-product. The variation of acid concentration as reactant and reaction time were conducted to determine its effect on the composition of PAC and the amount of gypsum produced. The optimum experiment produced liquid PAC with the highest Al2O3 composition of 11.96% and the lowest Cl− ion of 10.87% at 2 hours reaction time with a total acid concentration of 37.74%.
The performance of Pacitan Power Plant (pulverized boiler) toward the blending coal: an experimental
Authors: Rasgianti  , Cahyo N , Supriyanto E , Sitanggang R B , Triani M , Bakti D 
Published: December 2021

AbstractCoal blending testing of medium rank coal (MRC) and low-rank coal (LRC) in the Pacitan power plant with pulverized boiler type was conducted to increase the use of readily available coal. It was necessary to ensure the impact of the blending coal on the boiler performance. Therefore, this study was aimed to examine the performance of the plant. There were two coal blending configurations in testing; a) Combo #1: 75% of LRC and 25% MRC; b) Combo #2: 60% of LRC and 40% MRC. Each combination was held in 4 schemes of load at 165 MW, 210 MW, 255 MW, and 300 MW. Heat rate calculation was determined with the heat loss method (energy balanced approach). As a result, compared to the commissioning test (2,270 kCal/kWh), the power plant performance decreased. The performance of combo #1 obtained 2,517 kcal/kWh; meanwhile, combo #2‘s performance showed 2,360 kcal/kWh.
Characteristics of polymetallic enrichment on oceanic red bed in Matano Formation, Baturubei, Central Sulawesi, Indonesia
Authors: Jati Widiatama Angga , Fahruddin Achmad , Dwita Santy Lauti 
Published: December 2021

Abstract
The Matano Formation on Sulawesi Island has Cretaceous oceanic red bed (CORB) facies, but there is no further research on the geochemical characteristics of the sedimentary rocks. This study aims to classify the CORB of the Matano Formation and reveal the polymetallic element enrichment in CORB by using the X-ray fluorescence (XRF) analysis method. Matano Formation in the research area consists of two different facies: radiolarites facies and red clay facies. Radiolarites facies grouped as Si-ORB, dominated by siliceous pelagic bioclastic and deposited under oxic environment. The red clay facies grouped as Al-ORB, the components dominated by hemipelagic material with a small amount of silica shelled pelagically and deposited under reduction environment. Red clay facies have higher enrichment elements Mn, V, Ni, Zn and La than radiolarites facies. Oceanic red bed facies of Matano Formation deposited in basin plain environment below carbonate compensation depth in a passive margin tectonic setting.
Technical analysis of shovel working time towards inter-burden production achievement in open-pit coal mine
Authors: Sandra Wulandari Vivi , Korra Herdyanti Mixsindo , Novi Hartami Pantjanita 
Published: December 2021

Abstract
Shovel production can be affected by several factors, such as shovel working time and working conditions. The shovel production for the inter-burden removal target did not achieve at mining operations in Melak, East Kalimantan. This study’s main objective is to find the causes of the inadequate production and the efforts to improve. In this case study, the high delay due to the waiting for truck maneuvering caused the lack of shovel production. Some corrections were needed on the width of the loading point, and the loading method required to be replaced with double-side loading. Changes in the width of the loading point and loading method have an impact on increasing shovel productivity. In addition, a digger working time simulation is performed based on secondary data. Calculation of total production achievement is based on the simulation of time categories with working, standby, and repair time variables.
Low density optimization of emulsion explosive to improve blasting quality (MNK Max70)
Authors: Manullang Panangian , Arbi Madinatul , Rachman Jaka Slamet 
Published: December 2021

Abstract
PT Multi Nitrotama Kimia is a mining service company engaged in providing blasting services and the largest sales of explosives in Indonesia. PT Pamapersada Nusantara jobsite Kideco Jaya Agung is one of the customers of PT Multi Nitrotama Kimia in the blasting service business unit. On a far more optimal side, the development of commodity price conditions and operational needs is a common concern. From these conditions, one of the best target cost controls for blasting and fragmentation is to make adjustments and improvement to the quality and quantity of the use of bulk products. The high use of bulk products at the Kideco Jaya Agung Jobsite is a particular concern, especially for rocks that require a high powder factor value, thereby increasing blasting operation costs. From this condition, PT Multi Nitrotama Kimia strives to optimize the bottom value of density product emulsion MNK Max70 using chemical improvement from the previous 1.15 gr/cc to 1.05 gr/cc. This improvement has brought good results, where optimization in terms of using bulks product and blasting quality such as fragmentation and Velocity of Detonation (VOD) values are still in accordance with product standards.