bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the Influence of Spraying Conditions and Powder Feed Structure on Wear Properties of Atmospheric and Vacuum Plasma Sprayed Al2O3-13TiO2 Coatings
Authors: Leblanc L. , Kharlanova E. 
Published: October 2022

Abstract
This paper investigates the mechanical properties of plasma-sprayed Al2O3-TiO2 coatings. Micro and nano powders were deposited on hot and cold substrates under different conditions using atmospheric and vacuum plasma spraying. The coatings were then characterized based on microstructure, hardness, phase composition, abrasive wear rate, and adhesion strength. It is observed that Al2O3-TiO2 layers are very dependent on the coating system, powder form, and spray parameters used. The layers sprayed with nanopowder in a vacuum were found to have the best combination of properties. Paper includes a German-language abstract.
Tribotechnical Characteristics of Plasma Sprayed Alloyed Cast Iron-NiCrSiB Coatings
Authors: Kharlamov Y.A. , Budagyunchz N.A. , Yudichki S.A. , Shevchenko A.V. 
Published: October 2022

Abstract
This paper examines plasma-sprayed layers obtained from low-cost mixtures of cast iron and NiCrSiB powders. The composite coatings are characterized based on friction and wear testing and are found to have better tribological properties than coatings produced from any single alloy powder. The structure and properties of composite layers with different compositions of iron and nickel are investigated as well. Paper includes a German-language abstract.
A Modified HVOF Thermal Spray System for Producing Alumina Coating
Authors: Shimizu Y. , Yamashita K. , Sakaki K. 
Published: October 2022

Abstract
A high-velocity oxyfuel plant was converted to process aluminum oxide. Burner nozzles with different geometries were evaluated for use based on experimental measurements and numeric simulations. Although the modified nozzles promised an improvement in the melting of alumina particles, it was found that some of the melted alumina caked on the inside of the nozzle and fused together into large particles that eventually dislodged, causing a reduction in transfer efficiency. This paper explains how the caking problem was solved by combining the output of a high-velocity oxyfuel gun with that of a combustion flame spraying gun. Tests show that the hybrid solution produces hard alumina coatings with relatively dense microstructure at a transfer efficiency greater than 50%. Paper includes a German-language abstract.
An Investigation of the Corrosion Behaviour of Ni- and Co-Based Alloys Sprayed with Gas and Liquid Fuel HVOF Guns
Authors: Zhang D. , Harris S.J. , McCartney D.G. 
Published: October 2022

Abstract
A number of studies have examined the influence of process parameters on the microstructure and corrosion resistance of metallic coatings produced by gas-fuel HVOF spraying, but much less is known about the coatings produced by liquid-fuel HVOF processes. The aim of this study is to investigate the corrosion behavior and microstructure of nickel and cobalt alloys deposited by both methods and show how it compares with that of various superalloys. Paper includes a German-language abstract.
A New Technique to Plasma Spray Composite Stainless Steel-Graphite Coating with Low Friction Coefficient on 100C6 Steel
Authors: Harir A. , Ageorges H. , Grimaud A. , Fauchais P. , Platon F. 
Published: October 2022

Abstract
The aim of this study is to achieve, on aluminum alloy substrates, coatings with higher hardness and better dry tribological behavior than that of the substrate. Using atmospheric plasma spraying and a vibratory fluidized bed powder feeder, coatings consisting of a stainless steel matrix with embedded graphite particles were successfully deposited. The dry coefficient of friction of the composite layer is comparable with that of a commonly used stainless steel surface. SEM examinations of polished cross-sections reveal a lamellar structure with randomly distributed graphite inclusions. Paper includes a German-language abstract.
Innere Zentrifugalprojektionsbeschichtung (iCPC) – ein neuartiges Beschichtungs-verfahren (Inner Centrifugal Projection Coating (iCPC) – a Novel Coating Process)
Authors: Krüssel Th. , Bach Fr.-W. , Stoll P. 
Published: October 2022

Abstract
This paper describes a coating process, called internal centrifugal projection coating, in which rotating additive materials and substrate surfaces are melted by an electron beam to facilitate adhesion. It explains that the process was developed mainly to apply coatings inside engine bores and examines the microstructure of a molybdenum coating centrifugally projected onto an aluminum substrate. Paper includes a German-language abstract.
Erfahrungen beim Umsetzen der neuen ISO-Normen und EWF-Ausbildungen zu Qualitätsmanagement und Personalqualifikation (Experiences in Application of the New ISO Standards and EWF Education and Training for Quality Management and Qualification of Personnel)
Authors: Huber R. , Böhme D.G.F. 
Published: October 2022

Abstract
This paper reviews the new DIN EN ISO personnel qualification and quality management standards and EWF training guidelines for European thermal sprayers. EWF education and training programs run for a period of three weeks, filling critical gaps in knowledge and experience. The primary aim of the ISO standards is to facilitate a reproducible process for spraying coatings of a consistent quality. Paper text in German.
Residual and Applied Stresses in Thermally Sprayed Metallic and Ceramic Coatings
Authors: Dubský J. , Matějíček J. 
Published: October 2022

Abstract
In this paper, a four-point bending test is developed that makes it possible to load layers with defined tensile stresses. In the experiments, high-density stainless steel is applied using HVOF and ceramic layers are produced using water-stabilized plasma spraying. Both coating materials are then subjected to bend testing. The steel layers show a volume of elasticity twice that of the surface elasticity module, while in the ceramic layers, no surface tension was observed. This can be explained by the opening and closing of crack structures in the material. Paper includes a German-language abstract.
Study of Dielectric Properties of Plasma Sprayed Silicates at Low Voltage
Authors: Ctibor P. , Sedláček J. , Neufuss K. , Dubský J. , Chráska P. 
Published: October 2022

Abstract
This paper examines the dielectric properties of silicate coatings including mullite (3Al2O3-2SiO2), steatite (MgSiO3), spodumene (Li2O-Al2O3-4SiO2), and olivine with near-forsterite (Mg2SiO4) composition. The materials were sprayed using a water-stabilized plasma gun and the deposits were removed from the substrate, polished, and sputtered with aluminum on both sides. Electrical tests consisting of voltage, resistance, and capacitance measurements showed that the relative conductivity of plasma-sprayed silicates is stable between 200 Hz and 1 MHz, which is suitable for many insulation applications. Paper includes a German-language abstract.
Standardization in Coating Evaluation: A Universal System for Repair Coatings
Authors: Sauer J. , van Wonderen M. 
Published: October 2022

Abstract
This paper discusses the ongoing development of a standard for manufacturing and testing thermal spray coatings used in the repair of aircraft engines. Excellent progress has been made in eliminating non-value added tests and in defining a system for preparing metallographic specimens and conducting microstructural evaluations. Paper includes a German-language abstract.
Study and Characterization of High-Velocity Oxyfuel (HVOF) Sprayed Wear Coatings
Authors: Lima C.R.C. 
Published: October 2022

Abstract
This paper presents the results of a study on WC-Co layers obtained by high-velocity oxyfuel spraying using different commercial systems. It explains how test samples were produced and how coating microstructure, hardness, and wear resistance was examined. The results show that the layers have excellent wear resistance and are suitable for many applications. Paper includes a German-language abstract.
Laser Treatment of Thermally Sprayed Coatings
Authors: Pawlowski L. 
Published: October 2022

Abstract
This paper investigates the effect of laser post-treatment on cladded coatings deposited by different thermal spray methods. A wide range of coatings, including a VPS sprayed alloy, three APS sprayed oxide ceramics, and two composites, are treated with either a CO2 or pulsed Nd:YAG high-power laser. The microstructure and wear resistance of the layers are examined before and after treatment and the interaction between the laser and material is modeled using Fusion-2D. Paper includes a German-language abstract.
Microstructure Investigation of HVOF Sprayed WC-Co Coatings
Authors: Colin E. , Leaute M. , Roger T. , Le Maguer A. , Pawlowski L. , Janssen J.-P. 
Published: October 2022

Abstract
This paper discusses the optimization of HVOF spraying parameters for applying WC-Co and WC-CoCr powders. Coatings produced using the optimized parameters are evaluated based on microstructure, microhardness, and porosity. The influence of the processing method used to produce the powders is also considered along with in-flight particle characteristics. Paper includes a German-language abstract.
Thermogravimetric Analysis for Aluminum Phosphate Sealed Alumina and Chromia Coatings
Authors: Vippola M. , Vuorinen J. , Vuoristo P. , Lepistö T. , Mäntylä T. 
Published: October 2022

Abstract
This paper examines plasma-sprayed alumina and chromia coatings, with and without aluminum phosphate sealing, in order to assess the stability of the as-sprayed layers and phosphate reaction as a function of temperature during the sealing process. Thermogravimetric analysis showed no changes in mass in the alumina layers, an increase of 1.7% in the mass of the chromia layers due to oxidation, and a 14% loss of mass in the sealed layers, which agrees well with the evaporation behavior of a pure seal. Paper includes a German-language abstract.
Effect of Flow Regime on Particle Velocity in the HVOF Process
Authors: Dolatabadi A. , Pershin V. , Mostaghimi J. 
Published: October 2022

Abstract
Numerical modeling of the complex two-phase flow of gas-solid particles in a highly compressible field, as occurs in HVOF spraying, can serve as a tool for optimizing deposition efficiency, nozzle designs, and other parameters. In this paper, the authors develop a numerical model based on Euler’s equation and use it to investigate the effect of flow regime on the velocity of particles in an oxyfuel jet. Simulations based on typical HVOF operating conditions show large variations in the flow regime in regions of high particle concentration. Unlike other modeling approaches, the Eulerian approach predicts that the flow becomes subsonic near the centerline and drag force decreases significantly as do particle velocity and deposition efficiency. The effects of flow regime are also measured experimentally, validating the result. Paper includes a German-language abstract.
Influence of Nozzle Design on the Structure of a Plasma Jet Under Vacuum Conditions
Authors: Bolot R. , Klein D. , Coddet C. 
Published: October 2022

Abstract
This paper presents a detailed numerical analysis that shows why Laval nozzles are used for vacuum plasma spraying and how to optimize their design to achieve a uniform plasma jet free of expansion waves under different spraying conditions. A Laval nozzle prototype is tested against a commercially available conical nozzle and is found to deliver a longer core jet with less turbulent scattering. Paper includes a German-language abstract.
Effect of System Design on the Characteristics of Thermal Radiation Signals in the Simultaneous Measurement of Spray Particle Parameters
Authors: Li C.-J. , Wu T. , Li C.-X. 
Published: October 2022

Abstract
In-flight particle analysis via infrared sensing has proven helpful in the development and control of thermal spray processes. The aim of this work is to assess the effect of optical system design on thermal measurement accuracy. Through experimental testing and theoretical analyses, investigators show how variations in optical component sizes, alignments, and arrangements affect the amplitude and shape of sensor voltage waveforms and signal peaks. It is observed that only when photodetectors are in saturation, marked by the trapezoidal shape of their output signals, can they provide information about particle velocity, temperature, and size, and in some cases, even volume distribution. Correlation tests are carried out by means of plasma spraying molybdenum powder. Paper includes a German-language abstract.
Influence of Noise Factors on Atmospheric Plasma Spraying
Authors: Seemann K. , Fischer A. , Lugscheider E. 
Published: October 2022

Abstract
Studies on atmospheric plasma spraying have generally focused on the influence primary parameters such as gas flows and plasma current. However, the APS process is also influenced by a large number of disturbance variables including electrode wear, cooling system irregularities, and disruptions in powder injection. This study investigates both the cause and effect of each of these factors in the context of aluminum oxide spraying. Numerous measurements are made showing how electrode wear, cooling fluctuations, flow measurement inaccuracy, and variations in powder feed rates affect in-flight particle characteristics, deposition efficiency, and layer thickness. Paper includes a German-language abstract.
Penggunaan Model Pembelajaran Matematika Realistik pada Mahasiswa
Authors: Taga Gregorius , Restianim Vivien 
Published: October 2022

The purpose of this study was to determine student learning outcomes in algebraic subjects in the University of Flores Mathematics Education Study Program using realistic mathematics learning device models. This type of research is quantitative research with quasi-experimental design, pretest and posttest group, the sample is all fourth semester students of mathematics education program FKIP Flores University in 2018/2019 academic year. Data obtained using student learning outcomes, data processed using ANOVA statistical tests. The results obtained by the value of Fcount 77.13 is greater than Ftable 4.10 at dk 37. Calculation of student learning outcomes in the experimental group after using realistic mathematics learning models, seen student learning outcomes increased significantly. Conclusion, learning mathematics using realistic models can be used as an alternative to improving student learning outcomes in algebraic structure subjects.
Keywords: Learning Outcomes, Learning Models, Realistic Mathematics, Algebraic Structure
Penerapan Pendekatan Matematika Realistik Indonesia (PMRI) terhadap Kemampuan Pemecahan Masalah Siswa
Authors: Rosalina Elya , Mandasari Novianti 
Published: October 2022

This study aims to determine the Problem Solving Ability of Elementary School Class Students after the Indonesian Realistic Mathematics Approach (PMRI) was applied. This research is a quantitative research using experimental methods. The sampling technique used was a random sample technique. Where for the sampling method, which is drawn, the names that come out when drawn will be agreed to serve as the experimental class. This research consists of one independent variable, namely the Indonesian Realistic Mathematics Approach (PMRI), and the dependent variable is Problem Solving Ability. The subjects of this study were third grade students of SD 3 Lubuklinggau. Data collection is done by test technique. The data obtained were then analyzed using the t-test. After the data was analyzed using the t-test at a significant level of 5%, it was obtained tcount (7.57) > ttable (1.672), so it can be said that there was an increase in the problem solving ability of third grade students at SD Negeri 3 Lubuklinggau after the Indonesian Realistic Mathematics Approach (PMRI) was applied. . In conclusion, there is an increase in the problem solving ability of elementary school students after the implementation of the Indonesian Realistic Mathematics (PMRI) approach.
Keywords: Indonesian Realistic Mathematics Approach (PMRI), Problem Solving Ability
Hasil Belajar Matematika Siswa Ditinjau Dari Kecemasan Matematika dan Fasilitas Belajar di Rumah
Authors: Ibrahim Ibrahim , Amin Rokyul 
Published: October 2022

This study aims to determine the effect of mathematics anxiety, learning facilities at home, and the effect of mathematics anxiety and learning facilities at home simultaneously on students' mathematics learning outcomes. The approach in this research uses a quantitative approach, the type of correlational research. This research was conducted at SMP Negeri 1 Bayat in grades VIII A and VIII B in the 2020/2021 school year. The sample used was 30 students, the sampling technique was simple random sampling. The instrument used to use data from the mathematics anxiety scale test and the home learning facility scale test. The data analysis technique in this study used multiple regression analysis. Data analysis was carried out with the help of the SPSS 25 application. The results of this study indicate that: 1) there is a negative effect of mathematics anxiety on students' mathematics learning outcomes; 2) there is a positive effect of home learning facilities on students' mathematics learning outcomes; 3) there is an effect of mathematics anxiety and learning facilities at home together on students' mathematics learning outcomes.
Keywords: Mathematics Anxiety, Learning Facilities at Home, Mathematics Learning Outcomes
Analisis Kemampuan Computational Thinking Dalam Pembuatan Media Pembelajaran Matematika
Authors: Azmi Rizal Dian , Ummah Siti Khoiruli 
Published: October 2022

The purpose of this study was to reveal the implementation of Project Base Learning (PjBL)-based learning and then analyze the Computational Thinking (CT) ability of students of the Mathematics Education Study Program, University of Muhammadiyah Malang through a learning media development project. The approach used in this research is descriptive qualitative. The subjects in this study were students who programmed the Programming Language course in semester 3. The results of the research, the projects carried out in PjBL learning were making learning media using Matlab which included the stages of needs analysis, project planning, scheduling, monitoring, testing results and evaluating carried out. very well and systematically. The media produced by students has met the aspects of fluency in use, accuracy of scripts, and flowchart logic. The student's CT ability is in a good category from the aspect of abstraction, logarithmic thinking, debugging/evaluation, and generalization because it has met the achievement percentage of 82%. In conclusion, the learning media developed based on Project Base Learning (PjBL) has been implemented well, covering aspects of smooth use and effectively increasing the Computational Thinking (CT) ability of students of the Mathematics Education Study Program, University of Muhammadiyah Malang.
Keywords: Computational Thinking, Learning Media, Project Base Learning
Recovery from hemidiaphragmatic paralysis with improved respiratory function following cervical laminoplasty and foraminotomy: illustrative case
Authors: Kitamura Kazushi , Hayashi Hideki , Ishibashi Ryota , Toda Hiroki 
Published: October 2022

BACKGROUND
Hemidiaphragmatic paralysis can occasionally be caused by cervical canal and foraminal stenosis. Rarely is the effect of surgical decompression on hemidiaphragmatic paralyzed patient respiratory function recorded. This report details a case of postoperative respiratory function restoration in a patient with cervical spondylosis–related hemidiaphragmatic paralysis.

OBSERVATIONS
A 77-year-old woman suffered hemidiaphragmatic paralysis caused by cervical canal and foraminal stenosis. The phrenic nerve palsy was thought to be caused by compression of the cervical spinal cord and its nerve root. The patient received a C3 laminectomy, a C4–6 laminoplasty, and a left C3–4 and C4–5 posterior foraminotomy. After surgery, she improved her maximum inspiratory pressure and respiratory function.

LESSONS
Cervical canal and foraminal stenosis may cause hemidiaphragmatic paralysis due to radiculopathy-induced phrenic nerve palsy. Laminoplasty and posterior foraminotomy can restore respiratory dysfunction related to diaphragmatic paralysis by decompressing the ventral horn of the spinal cord and spinal nerve root.
Analisis Ekonomi Kepiting Bakau (Scylla sp.) Melalui Sistem Pengepul di Segara Anakan Bagian Barat Cilacap
Authors: Junaidi Teuku , Hilmi Endang , Madusari Benny Diah , Williansyah M. Haris 
Published: October 2022

Ekosistem mangrove memiliki jasa ekosistem sebagai habitat bagi kepiting bakau (<em>Scylla</em> sp.). Kepiting bakau <em>Scylla </em>sp. merupakan organisme perairan yang memiliki nilai ekonomis yang tinggi yang menjadi sumber pendapatan bagi masyarakat sekitarnya termasuk di wilayah Segara Anakan bagian Barat. Penelitian ini bertujuan untuk menganalisis nilai ekonomi kepiting bakau <em>Scylla</em> sp dari system pengepul sebagai bentuk perdagangan kepiting bakau <em>Scylla</em> sp. Metode yang digunakan dalam penelitian ini adalah analisis ekonomi melalui pendekatan analisis <em>cash flow</em>. Hasil penelitian ini menunjukan bahwa pendapatan pengepul mencapai Rp. 465.360.333 dengan total biaya mencapai Rp 438.045.861 serta nilai keuntungan yang didapat pengepul sekitar Rp. 27.314.472. Hasil analisis kelayakan usaha, menunjukan bahwa nilai nilai pendapatan saat ini (NPV) rata-rata Rp. 11.367.986 nilai suku bunga yang dapat diberikan (IRR) mencapai 42 % dan rasio pendapatan dengan biaya (BCR) <em> </em>mencapai 1,74. Dari analisis kelayakan tersebut menunjukan bahwa system pengepul bagi komoditi kepiting bakau Scylla sp layak untuk dilakukan
Penambahan Tepung Buah Pepaya (Carica papaya L.) Terhadap Pertumbuhan dan Rasio Konversi Pakan Ikan Bandeng (Chanos chanos)
Authors: Wijianto Wijianto , Linayati Linayati , Maghfiroh Maghfiroh 
Published: October 2022

<p>Ikan bandeng (<em>Chanos chanos</em>) merupakan salah satu ikan yang digemari oleh masyarakat dan potensial untuk dikembangkan karena bernilai ekonomis. Buah pepaya merupakan salah satu buah yang mengandung enzim papain. Enzim papain bertugas sebagai biokatalisator dalam reaksi kimia pada proses metabolisme. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan buah pepaya pada pakan terhadap pertumbuhan dan rasio konversi pakan serta untuk mengetahui dosis yang tepat untuk pakan ikan bandeng. Ikan uji menggunakan ikan bandeng berukuran 3 cm dengan padat tebar 1 ekor/L. Metode yang digunakan yaitu metode eksperimental menggunakan rancangan acak lengkap (RAL), terdiri atas 4 perlakuan 3 ulangan. Pakan uji yaitu pakan yang ditambahkan tepung buah pepaya sesuai dosis tiap perlakuan yaitu 0 % per kg pakan (A); 5% per kg pakan (B); 7,5 % per kg pakan (C); dan 10% per kg pakan (D). Frekuensi pemberian pakan sebanyak 3 kali sehari dan dipelihara selama 35 hari. Hasil penelitian menunjukkan nilai pertumbuhan bobot mutlak terbaik yaitu pada perlakuan 7,5% per kg pakan (D). Rasio konversi pakan terbaik yaitu pada perlakuan 7,5% per kg (D). Kualitas air selama pemeliharaan ikan bandeng yakni suhu 27–29 <sup>0</sup>C, salinitas 27–30 ppt, pH 6,8–7,3, dan DO 5 – 6 mg/l.</p><p> </p><p>Kata kunci: Buah Pepaya, FCR, Ikan Bandeng, Pertumbuhan</p>