bluuebunny/crossref_metadata_2025_split huggingface dataset:
PENGEMBANGAN E-MODUL MATERI BARISAN DAN DERET UNTUK MEMFASILITASI KEMAMPUAN PEMECAHAN MASALAH MATEMATIS
Authors: Nurhasanah Fitri , Sumarni Sumarni , Riyadi Mohamad 
Published: December 2022

Penelitian ini bertujuan untuk mengembangkan bahan ajar berupa e-modul materi barisan dan deret untuk memfasilitasi kemampuan pemecahan masalah matematis serta kevalidan dan kepraktisan e-modul. E-modul yang dikembangkan berdasarkan pemecahan masalah Polya dan berbasis model pembelajaran Problem Based Learning (PBL). Metode yang digunakan merupakan jenis penelitian RD. Model pengembangan yang digunakan adalah metode pengembangan menurut Plomp yang terbagi menjadi tiga fase yaitu pendahuluan, pengembangan atau prototipe, dan penilaian. Penelitian dilakukan di SMAN 3 Kuningan. Teknik pengumpulan data yang digunakan berupa angket. Angket digunakan untuk menguji kevalidan dan kepraktisan e-modul. Uji kevalidan dilakukan oleh 4 validator yang terdiri dari 1 dosen matematika, 1 dosen teknik informatika, 2 guru matematika. Uji kepraktisan dilakukan oleh 6 orang yang terdiri dari 2 guru matematika dan 4 siswa kelas XI SMA. Teknik analisis data yang digunakan adalah mencari persentase pada uji kevalidan dan uji kepraktisan. Berdasar hasil analisis kevalidan e-modul dikategorikan “sangat valid” dan analisis kepraktisan e-modul dikategorikan “sangat baik”. E-modul yang dikembangkan dapat digunakan dilapangan karena memenuhi kategori kevalidan dan kepraktisan. Peneliti selanjutnya diharapkan dapat melakukan uji keefektivan bahan ajar.
DAMPAK KEBUTUHAN SOSIAL DAN PENGARUH SOSIAL PADA PERILAKU PEMBELIAN KONSUMEN TERHADAP PONSEL CERDAS
Authors: Hadi Antonius Satria 
Published: December 2022

Penelitian ini bertujuan untuk menguji pengaruh aspek-aspek sosial yaitu kebutuhan sosial dan pengaruh sosial terhadap ketergantungan dan pengaruh ketergantungan terhadap ponsel cerdas pada niat pembelian ulang. Kebutuhan sosial dan pengaruh sosial adalah aspek sosial sebagai faktor yang memicu ketergantungan. Kebutuhan sosial meliputi keinginan untuk dicintai, berteman dan diterima oleh orang lain. Sedangkan pengaruh sosial adalah cara seseorang untuk memengaruhi keyakinan, perasaan, dan perilaku orang lain. Penelitian ini memiliki tiga hipotesis. Data dikumpulkan dari responden yang diperoleh dari kuesioner yang dibagikan kepada mahasiswa Universitas Gadjah Mada. Data kemudian dianalisis menggunakan teknik pemodelan persamaan struktural dengan bantuan perangkat lunak LISREL. Hasil penelitian ini menunjukkan bahwa kebutuhan sosial dan pengaruh sosial berpengaruh positif dan signifikan terhadap ketergantungan, sedangkan ketergantungan berpengaruh positif dan signifikan terhadap niat pembelian ulang. Semua hipotesis dalam penelitian ini diterima. Masing-masing hipotesis dibahas secara detil dalam artikel ini. Kata Kunci — kebutuhan sosial, pengaruh sosial, ketergantungan, niat pembelian ulang, ponsel cerdas
Atmospheric Plasma Spraying (APS) Low-Temperature Cathode Materials for Solid Oxide Fuel Cells (SOFCs)
Authors: Harris J. , Kesler O. 
Published: December 2022

Abstract
Atmospheric plasma spraying is attractive for manufacturing solid oxide fuel cells (SOFCs) because it allows functional layers to be built rapidly with controlled microstructures. The technique allows SOFCs that operate at low temperatures (500 to 700 °C) to be fabricated by spraying directly onto metallic supports. However, standard cathode materials used in SOFCs have high polarization resistance at low temperatures, necessitating alternative materials. In this study, coatings of lanthanum strontium cobalt ferrite (LSCF) were fabricated on steel substrates using axial-injection atmospheric plasma spraying. Coating thickness and microstructure were evaluated and X-ray diffraction (XRD) analysis was performed to detect material decomposition and the formation of undesired phases in the plasma. The results define the envelope of plasma spray parameters for depositing LSCF coatings and the conditions in which composite cathode coatings can be produced.
Microstructure and Thermal Cycling Behavior of Atmospheric Plasma Sprayed Thermal Barrier Coatings with High Segmentation Crack Densities
Authors: Karger M. , Vaßen R. , Stöver D. 
Published: December 2022

Abstract
This study investigates the influence of segmentation crack density on the strain tolerance of thermal barrier coatings produced by atmospheric plasma spraying. A Triplex II plasma gun is used to spray fused and crushed yttria-stabilized zirconia, forming thick deposits with high segmentation crack densities, low porosity, and low branching crack density, which is necessary for good interlamellar bonding. Thermal cycling and burner rig tests yield promising results in terms of lifetime and strain tolerance behavior and microstructural analysis shows that the segmentation crack network was stable during thermal shock testing. The main failure mechanism was delamination and horizontal cracking in the vicinity of the TBC-TGO (thermally grown oxide) interface.
Preparation and Characterization of Solid Electrolyte for IT-SOFC Applications Using Atmospheric Plasma Spray Technique: An Inside Understanding by Performance and Stability (PAS) Analysis and Molecular Dynamic Simulation
Authors: Tung K.L. , Chang K.S. , Kang C.H. , Chiang Y.C. 
Published: December 2022

Abstract
In this study, molecular dynamic simulations are used to analyze the effect of dopant concentration on the performance and stability of zirconia-based solid electrolyte. Different amounts of Sc2O3 are diffused into the YSZ system to simulate various Sc-Y-SZ electrolyte compositions for analysis. The calculations predict that ionic transport efficiency improves with increasing Sc2O3 concentration as does the mobility of oxygen ions. The simulated results agree well with experimental data, indicating that the molecular dynamic technique may be helpful in the design and development of materials for SOFC applications.
Influence of Composition of TGO on the Thermal Shock Lifetime of Thermal Barrier Coatings with Cold-Sprayed MCrAlTaY Bond Coat
Authors: Li Y. , Li C.-J. , Zhang Q. , Yang G.-J. , Li C.-X. 
Published: December 2022

Abstract
This study investigates the influence of thermally grown oxide (TGO) on the lifetime of thermal barrier coatings (TBCs). In the experiments, cold sprayed NiCoCrAlY powder was deposited as the bond coat and plasma sprayed YSZ was deposited as the topcoat. The TBCs were subjected to various treatments to induce different types of TGOs at the bond coat-topcoat interface. Three types of oxide were detected, including spinel, chromium oxide, and alumina. Thermal cycling tests show how the oxides contribute to cracking and spalling in the topcoat layer and how the morphologies and constituents of the oxides can change with time and temperature.
Flame Spraying of Mullite/ZrO2 Powders
Authors: García E. , Cano C. , Osendi M.I. , Miranzo P. 
Published: December 2022

Abstract
Mullite based compositions have interest for thermal barrier coatings because they have thermal expansion coefficients close to those of silicon ceramic substrates. In this work, mullite-zirconia coatings are obtained by flame spraying and characterized based on microstructure, crystal phases, hardness, elastic modulus, and thermal conductivity. Crystallinity is improved by in-situ heating with a flame torch, which is also shown to increase hardness and elastic modulus. Thermal diffusivity measurements show that the thermal properties of mullite-zirconia coatings are relatively stable over a wide temperature range and adequate for many thermal barrier applications.
Degradation of Thermal Barrier Coatings by Fuel Impurities and CMAS
Authors: Sohn Y.H. , Mohan P. , Schelling P. , Nguyen D. 
Published: December 2022

Abstract
This study investigates the degradation of YSZ-CoNiCrAlY thermal barrier coatings (TBCs) due to vanadium and phosphorus pentoxides and calcium-magnesium aluminosilicate (CMAS) sand at temperatures up to 1400 °C. The pentoxides are shown to degrade bond coat and topcoat layers through acidic dissolution, while CMAS sand is shown to degrade YSZ layers through ingress and the precipitation of ZrO2 grains. Density functional theory simulations provide insights on reactions at the surface of fluorite-structured oxides and the role of oxygen vacancy clustering. A method to mitigate melt-infiltration attack through electrophoretic deposition is introduced.
Microstructure and Electrical Properties of Coatings of the Cr2O3-TiO2 System
Authors: Berger L.-M. , Stahr C.C. , Saaro S. , Thiele S. 
Published: December 2022

Abstract
In this study, the deposition, microstructure, and resistivity of APS and HVOF sprayed Cr2O3-TiO2 coatings is systematically investigated. Commercially available Cr2O3-rich feedstock powders are used along with five agglomerated and sintered experimental powders on the TiO2-rich side. Both processes are found to produce homogeneous, low-porosity coatings with phase compositions that can be changed by adjusting process parameters. Coating hardness and electrical resistivity are found to depend heavily on Cr2O3 content.
Investigation of Plasma Sprayed and Constrained-Sintered Zirconia Based Electrolytes
Authors: Christenn C. , Ansar S.A. 
Published: December 2022

Abstract
This study investigates the effects of sintering on conventional and nanostructured plasma sprayed YSZ. In order to gain a better understanding of the differences in sintering behavior, the layers are sintered under constrained and non-constrained conditions over a temperature range of 800 to 1520 °C. The influence of particle size on sintering kinetics, microstructure development, electrical properties, and thickness is assessed for free-standing layers as well as deposits on rigid substrates.
Al2O3 – ZrO2 Finely Structured Multilayer Architectures from Suspension Plasma Spraying
Authors: Tingaud O. , Montavon G. , Denoirjean A. , Coudert J.-F. , Rat V. , Fauchais P. 
Published: December 2022

Abstract
One of the goals of this study is to better understand how suspension plasma spraying parameters, particularly plasma gas mixtures, influence layer formation. Another goal is to produce finely structured layers of Al2O3-ZrO2 with a wide range of architectures. To that end, a simple theoretical model is used to describe the operating conditions of the plasma torch and the influence of spraying parameters is expressed in terms of the shape and size of spray beads.
Dry Sliding Behavior of Sub-Micrometer-Sized Suspension Plasma Sprayed Ceramic Oxide Coatings
Authors: Darut G. , Ben-Ettouil F. , Denoirjean A. , Montavon G. , Ageorges H. , Fauchais P. 
Published: December 2022

Abstract
Numerous works have shown that decreasing the scale of coating structure leads to an improvement in tribological behavior. Suspension plasma spraying has proven particularly effective at producing coatings with submicron even nanoscale structure, while maintaining the versatility of thermal spraying. This paper examines the dry sliding behavior of several ceramic oxide composite coatings produced by suspension plasma spraying. The structural scale and the effect of composition are studied as well.
WC-Based Coating Production by the Pulsed Gas Dynamic Spraying Process: Coatings and Process Analysis
Authors: Yandouzi M. , Jodoin B. 
Published: December 2022

Abstract
The work presented in this paper is part of a comprehensive research program aimed at exploring the possible use of pulsed gas dynamic spraying to produce WC-based coatings. This portion of the work assesses the effect of processing parameters on particle characteristics and coating microstructure. Particle velocity is measured at the gun exit using a laser diagnostic system and correlated with various spray parameters. A combination of analysis techniques (OM, SEM, XRD, and microhardness) are used to characterize the feedstock powder and sprayed coatings. The results show that an increase in particle preheating temperature and velocity increases hardness and reduces coating defects.
Properties of Copper Coatings Obtained by Cold Gas Dynamic Spraying Using Helium: Influence of the Oxide Content of the Powder
Authors: Kairet T. , Godet S. , Degrez M. , Alexandre S. 
Published: December 2022

Abstract
In this study, two copper powders with different size distribution are applied to aluminum substrates using cold gas dynamic spraying. The powders are sprayed with helium gas at ambient temperature and at 200 °C. Investigators measure oxide content in the powders and correlate it with in-flight particle velocity, deposition efficiency, particle deformation, and coating properties including microhardness, structure, and dislocation density.
Effects of Gas Temperature, Gas Pressure, and Particle Characteristics on Cold Sprayed Pure Titanium Coatings
Authors: Wong W. , Rezaeian A. , Yue S. , Irissou E. , Legoux J.-G. 
Published: December 2022

Abstract
This work investigates the influence of nitrogen gas pressure and temperature on the structure and properties of cold sprayed titanium coatings. Two guns were used to assess the effect of impinging particle temperature. Particle speed was measured and used to calculate critical velocity for selected experimental conditions. The results show that increasing the temperature and pressure of the gas propellant reduces coating porosity and increases hardness, flattening ratio, and deposition efficiency. At the maximum pressure and temperature (40 bar and 800 °C) for nitrogen gas, coating density was close to the value reported for cold sprayed titanium produced using helium as the propellant.
Investigation of Aluminum Coating with Dispersed Nanoscale Quasicrystalline Particles Produced by Cold Spray
Authors: Hishida M. , Fujita M. , Sakaki K. 
Published: December 2022

Abstract
In this study, an aluminum coating with dispersed quasicrystalline particles is produced by cold spraying. The spraying was done using helium gas at a temperature of 400 °C. The obtained coating exhibited a relatively precise microstructure with almost no macroscopic voids. X-ray and TEM analyses confirmed that the coating retained its quasicrystal structure on the surface as well as internally. TEM analysis also revealed that metallic bonding occurred at powder-powder and powder-substrate interfaces. Although the hardness of the coating was higher than that of extruded bulk alloy, tensile strength was found to be much lower, which is attributed to defects at particle-particle interfaces.
Kinetic Metallization – Coating Development System
Authors: Tapphorn R. , Gabel H. , Henness J. 
Published: December 2022

Abstract
This presentation reviews the features and capabilities of the KM-Coating Development System, a tool that provides hands-on experience with the kinetic metallization process. The latest version of the tool incorporates mass flow controllers that facilitate gas mixing and computerized feeding of ultra-fine and highly agglomerating powders. Coatings and spray-formed products produced with the new system are presented along with corresponding material properties.
Toughening of Cold-Sprayed Nanostructured WC-12Co Deposit through Using Multimodal WC Particles and Annealing
Authors: Yang G.-J. , Gao P.-H. , Li C.-J. , Li C.-X. 
Published: December 2022

Abstract
The aim of this study is to investigate the effect of multimodal powders and annealing on cold sprayed deposits. In the experiments, a multimodal WC-Co powder containing micro- and nano-sized particles was prepared by ball milling and deposited on stainless steel substrates. The hardness of the resulting layer was comparable to that of the nanostructured WC-Co bulk and its fracture toughness reached a level close to that of the microstructured bulk. It is thus shown that with multimodal particle distribution cold-sprayed WC-Co can be simultaneously strengthened and toughened. Investigators also show that interface cohesion between WC and cobalt phases can be improved by annealing, which leads to further toughening as well.
Properties of Powders, Coatings and Consolidated Components Produced from Nano- and Near-Nano Crystalline Powders
Authors: Schroeder S. , Melnyk C. , Grant D. , Gansert R. , Saha G. , Glenesk L. 
Published: December 2022

Abstract
This study examines the influence of nano- and near-nano grains in bulk powder metal processing thus providing a baseline for understanding the potential of nanopowders for thermal spray application. Two light alloys (Al and Ti) and two tungsten carbide blends (WC-NiCrBSi and WC-CoCr) are cryomilled into nanocrystalline powders. The nanopowders are consolidated via hot isostatic pressing or spark plasma sintering and tested along with consolidated forms of virgin (micron scale) grains, shedding light on property improvements achieved through nanograined materials. HVOF coatings produced from nano- and micro-crystalline powders are tested as well, and the results are correlated with the improvements observed in the consolidated material forms.
A Deposition Model for Wire Arc Spraying and Its Computationally Efficient Simulation
Authors: Wiederkehr T. , Müller H. , Krebs B. , Abdulgader M. 
Published: December 2022

Abstract
Computer simulations of thermal spray coating processes can accelerate the development of new products by minimizing the need for prototypes. An important aim of these simulations is the calculation of the coating distribution on the surface of a given workpiece with respect to a given movement path of the spray gun. In this paper, a novel approach for computing coating distribution on arbitrarily complex freeform surfaces is presented. In contrast to approaches that implement symmetric deposition models, the presented concept is based on a rotationally asymmetric model, making it particularly well suited for wire arc spraying as turbulences caused by electrodes in the gas flow often result in asymmetric coating distributions. In order to obtain the required knowledge base to derive the deposition model and verify the simulation, basic experiments were made. The simulation concept and experimental setup are presented in the paper along with the results.
Industrial and Research Activities in Thermal Spray Technology in the Nordic Region of Europe
Authors: Vuoristo P. , Nylén P. 
Published: December 2022

Abstract
This paper provides an overview of thermal spray activities in Finland, Sweden, Norway, and Denmark. In Finland, thermal spray technology has widest use in pulp and paper processing, protecting various types of rolls and cylinders. In Sweden, the technology is of great importance in the manufacture of aero engines and industrial gas turbines. In Norway, thermal spraying is widely used in offshore applications, including subsea oil drilling enterprises, and in Denmark, thermal spraying is used in boilers, maritime diesel engines, and for wear resistance of machine tool components. Development and innovation in thermal spray technology in northern Europe is dominated by research conducted in Finland and Sweden, followed by Denmark and Norway.
Influence of Powder Properties and Plasma Spray Conditions on Erosion Resistance of Yttrium Oxide Coatings against Halogen Plasma for Dry Etching Process in Semiconductor and Electronic Applications
Authors: Ibe H. , Sato K. , Yuasa F. , Mizuno H. , Kitamura J. 
Published: December 2022

Abstract
This study investigates the influence of plasma spray conditions on the structural, mechanical, and plasma-erosion properties of yttrium oxide coatings. Powder feed rate, plasma power, and primary particle size appear to have little effect on plasma erosion properties, hardness, surface morphology, and coating structure. However, a Y2O3 coating produced with fine powder retained a smooth erosion surface despite its porosity and relatively low hardness.
Effect of Mn on the Formation of Pickups on Thermal Spray Coatings
Authors: Huang T.-S. , Yu C.-S. , Wu J.-R. , Liou H.-Y. , Hsieh S.-H. , Huang T.-K. , Su C.-Y. 
Published: December 2022

Abstract
Thermal spray coatings have been applied on furnace rolls in continuous annealing lines to improve product quality and prolong roll service life. The most common defects formed on working furnace rolls are oxide pickups. In this study, HVOF sprayed cermet coatings are used to duplicate pickups by reacting with iron and manganese oxides. The reactions are performed in a furnace at 900 °C with inert gas flow. After testing for eight days, large Mn-rich pickups were formed on the coatings while pickups without Mn were very small. Mn was shown to enhance the reaction between the coating and the iron oxide. Pickups from a furnace roll were also investigated and compared with the laboratory samples.
Advances of Thermal Sprayed Carbon Roller in Paper Industry
Authors: Yoshiya A. , Shigemura S. , Nagai M. , Yamanaka M. 
Published: December 2022

Abstract
This paper discusses the role of thermal spraying in the development of carbon-fiber rollers for web processing equipment. It provides a detailed review of the roller design covering key sizing and selection criteria with emphasis on roller surface performance. It describes the manufacturing process, which includes the application of a 30-35 mm HVOF-sprayed WC layer, and the tests used to verify that the coating meets design requirements and that the roller will provide stable rotation at ultrahigh speeds, sufficient traction force, and high abrasion resistance. A version of the HVOF-coated carbon-fiber roller discussed in this paper is installed in a slitter-winder, running smoothly at speeds up to 4800 rpm with no abrasive wear.
Thermal-Sprayed CFRP Rolls with Resistance to Thermal Shock and Wear for Papermaking Machines
Authors: Nagai M. , Shigemura S. , Yoshiya A. 
Published: December 2022

Abstract
Carbon-fiber-reinforced plastic (CFRP) rolls are increasingly employed in manufacturing equipment due to their light weight, high stiffness, and low inertia and flexure. These rolls, however, are rarely used without a surface coating due to their lack of wear resistance and gripping properties. This paper examines the effects of thermal shock on an experimental carbide-type cermet coating deposited by atmospheric plasma spraying on a CFRP test roll. After thermal shock testing, coating cracks and peeling were observed. The underlying cause was determined and an improved coating, a nickel-base composite with high thermal shock resistance, has been developed, tested, and put to use in a papermaking line, where the rolls have been maintenance-free for more than four years.
Study on Corrosion Behavior of Cold Sprayed Al-αAl2O3 Deposit on AZ91D Alloy
Authors: Xiong T. , Tao Y. , Sun C. , Jin H. , Du H. , Li T. 
Published: December 2022

Abstract
A composite coating using mixed powders of pure Al and α-Al2O3 as feedstock was deposited on AZ91D alloy substrate by cold spraying. The content of α-Al2O3 in mixed powders was 50wt%. Electrochemical experiments were carried out using 3.5wt.% NaCl solution as electrolyte. Because of dense structure, the composite coating could separate substrate from electrolyte thoroughly for long time immersion. The corrosion behavior of the composite coating was evaluated by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. It is found that the composite coating presented much better corrosion resistance than bare AZ91D alloy, even than bulk 1050 aluminum by electrochemical studies in 3.5wt.% NaCl solution.