bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation of Particle Flattening and Solidification Under Plasma Spraying
Authors: Gromyko G. , Zajats G. , Kundas S. , Ilyuschenko A. 
Published: May 2022

Abstract
In this paper, the flattening and the simultaneous solidification of a liquid particle when it hits a solid surface are described mathematically and numerically simulated in cylindrical coordinates on the basis of the Navier-Stokes equations. The heat transfer in the particle and in the substrate is simulated by solving the 2-D heat conduction problem, whereby hydrodynamic processes in the melted particle as well as pressure forces are taken into account. The particle solidification is investigated using the one-dimensional Stefan problem, taking into account the contact heat conduction at the boundary between particle and substrate. For numerical calculations, computational algorithms were created on the basis of the difference method, which were implemented in the form of an applied program complex. Paper includes a German-language abstract.
Optimization of Plasma Spraying Modes for Hydroxyapatite Coatings
Authors: Ilyuschenko A. , Okovity V. , Ivashko V. , Shevtsov A. , Sobolevsky S. , Kulak A. , Lesnikovich L. , Kovaleva O. 
Published: May 2022

Abstract
Ti-implants plasma-sprayed with a hydroxyapatite (HA) coating are widely used. When using an implant the coating quality is characterized by the presence of HA decomposition products and sprayed material structure. This paper investigates the properties of hydroxyapatite coatings and their dependence on the types of plasma spray. The types of hydroxyapatite decomposition on titanium substrates using plasma spray technology are optimized. Paper includes a German-language abstract.
Characterisation of Bond Coatings Tested in Oxidising Environments
Authors: Guilemany J.M. , de Paco J.M. , Armada S. 
Published: May 2022

Abstract
This paper aims to characterise and to study several Ni-based alloys bond coatings and to determine the very best spraying conditions to achieve FGMs by means of a single gun with independent powder feed. First, adhesive layers made of NiCr, NiAl, and NiCrAlY were sprayed onto a steel substrate. All samples were tested by isothermal oxidation at 1000 deg C. The oxides formed and the conversions of the original oxides were studied on the samples and characterized using scanning electron microscope and EDS. It is observed that the study of three different bond coating sprayed with the same conditions reveals the best performance for the NiCr coating. Paper includes a German-language abstract.
Characterization and High Temperature Behaviour of Cr2O3-NiCr Plasma Sprayed Coatings
Authors: Hidalgo V.H. , Varela F.J.B. , Martínez S.P. 
Published: May 2022

Abstract
This paper investigates the microstructure, bond adhesion, and high temperature and thermal fatigue performance of plasma-sprayed chromium carbide, nickel-chromium coatings after continuous exposure at high temperature inside a combustion chamber that simulates the extreme conditions existing in different industrial applications. Experiments on high temperature behavior under oxidative and neutral atmospheres and thermal fatigue tests are carried out in a test combustion chamber. Finally, the adhesion between the substrate and the coating layer is assessed using tensile tests. The paper discusses the results with special consideration of the microstructure development through the heat treatment. Paper includes a German-language abstract.
Connection of the Thermical, Displacement and Strain Processes Under Dispersive Welding
Authors: Péter L. , Kiss L. 
Published: May 2022

Abstract
Dispersion welding can be used both for repairing worn machine parts and for atomization on surfaces with novel components. Knowledge of the temperature changes during melting and the shifting process of the scattered layer are important for the exact technological design, because the expansion and stress processes can be calculated from this data. In this paper, the expansion calculations are presented, which were determined on the basis of the measurement data during induction melting. Paper includes a German-language abstract.
Increase of Wear Resistance of the Spraying Coatings by Means of Impulse-Plasma Processing
Authors: Ilyuschenko A. , Ivashko V. , Okovity V. , Tolochko N. , Shevtsov A. , Buykus K. 
Published: May 2022

Abstract
This paper investigates the wear resistance of NiCr-Fe+50(80)%chromium carbide and NiCr-Fe+50%SiC coatings. This is achieved by the plasma spraying of composite powders and the mechanical mixing of powders, followed by an additional treatment with pulses of a plasma jet. The mechanism of wear of the sprayed coatings is also analyzed. Paper includes a German-language abstract.
Versiegeln von thermisch gespritzten Schichten (Sealing of Thermally Sprayed Coats)
Authors: Wielage B. , Hofmann U. , Steinhäuser S. 
Published: May 2022

Abstract
In order to improve the properties profile of thermally sprayed coats (in particular, the corrosion resistance), the coats are, amongst other items, posttreated with organic and/or inorganic posttreatment media. The coat combinations used are Al2O3/TiO2 (87/12), APS-sprayed, and WC-Co (88/12), HVOF-sprayed. Commercially available sealants and two products from other areas of application were used for sealing purposes. The main contribution of the sealing agents to the anti-corrosion protection lies in the fact that they seal open, (inter)connected pores and/or cracks and thus prevent corrosive media from penetrating into the sprayed coat and from reaching the substrate. In this respect, the best results are achieved with sealing agents which form a dense film extending into the pores of the coat. The component underneath can be protected optimally by the combination of the sprayed coat and the sealing agents. Paper text in German.
Electromagnetic Acceleration Plasma Spraying for Ceramic Coatings
Authors: Tahara H. , Shibata T. , Andoh Y. , Yasui T. , Kagaya Y. , Yoshikawa T. 
Published: May 2022

Abstract
The quasi-steady magneto-plasma-dynamic (MPD) arcjet generator is a promising plasma accelerator, which has a coaxial electrode structure similar to those of conventional plasma torches. The MPD arcjet generator utilizes principally electromagnetic acceleration of the interaction between the discharge current of kiloamperes and the azimuthal magnetic field induced by the discharge current, although the working gas is accelerated aerodynamically through a nozzle in a thermal arcjet generator. In this paper, ablation-type MPD arcjet generators are developed for ceramic coatings. Discharge voltages and ablation rates of ceramic materials are examined, and front velocities of ablated atoms of ceramic component are also estimated using a streak camera. The Vickers hardness of coating is measured. Their cross sections are observed with a scanning electron microscope, and their surfaces are analyzed by means of x-ray diffraction and x-ray photoelectron spectroscopy. Paper includes a German-language abstract.
Plasma Characteristics of Supersonic Ammonia and Nitrogen/Hydrogen-Mixture Plasma Jets Under a Low Pressure Environment
Authors: Tahara H. , Shibata T. , Andoh Y. , Yasui T. , Onoe K. , Yoshikawa T. 
Published: May 2022

Abstract
Ammonia and a mixture of nitrogen and hydrogen are used for material processing. Since these gases are chemically active, the processing efficiency is enhanced. This article describes a study to understand the physical properties of ammonia and a mixture of nitrogen and hydrogen plasmas inside and outside an arcjet generator. Spectroscopic measurement is made, and several plasma properties are determined from the data. The result shows that the H-atom electronic excitation temperature and the nitrogen rotational excitation temperature decreased from 7000-11000 K in the constrictor to about 4000 K and to 1000-1500 K, respectively, on the nozzle exit with mass flow rates of 0.1-0.2 g/s at input powers of 7-12 kW. However, the NH rotational excitation temperature did not show a significant axial decrease even in the downstream plume. Paper includes a German-language abstract.
High Frequency Pulse Detonation (HFPD): Processing Parameters
Authors: Fagoaga I. , Barykin G. , de Juan J. , Soroa T. , Vaquero C. 
Published: May 2022

Abstract
The High Frequency Pulse Detonation (HFPD) thermal spray process represents a novel cost-effective alternative for the production of premium quality coatings. In this paper, the HFPD spray technique is characterized by very flexible capabilities which allow to deposit a wide range of materials according to different specifications. The spray parameters are carefully selected and adapted to the respective material or specification. The qualitative effect of each parameter on the coating properties and the reliability of the system are checked. Examples of different coatings are presented. Paper includes a German-language abstract.
Praktische Erfahrungen beim Einsatz eines Spektrometer-Meßsystems zur Prozeßüberwachung und -optimierung beim thermischen Spritzen (Experiences with the Application of a Spectroscopic Measurement System for Thermal Spray Process Control and Optimization)
Authors: Aumüller B. , Lang A. , Dotzler K. , Bergmann H.W. , Schutte K. 
Published: May 2022

Abstract
A spectroscopic measurement system has been developed and used for thermal spray applications. The system provides on¬line information of the process and allows the determination of process fluctuations over various time scales. Paper text in German.
Prozeßdiagnostik an thermischen Beschichtungsverfahren – eine DFG-geförderte Forschungsgruppe stellt sich vor (Diagnostic Methods in Thermal Coating Processes – Presentation of a Project Group Funded by the DFG)
Authors: Bach Fr.-W. , Henne R. , Landes K. , Lugscheider E. 
Published: May 2022

Abstract
A project group consisting of four institutes and funded by the DFG has started a new approach to investigate the complicated processes (phenomena) involved in thermal coating in order to control these methods and here especially the plasma spraying in a better way and to make use of them more efficiently. This approach starts from the desired quality of the layer to be produced and derives the required conditions and features of plasma and spray material prior to deposition to get this quality. To obtain well-defined interrelationships several modern and specially modified diagnostic methods have to be used and theoretical considerations performed as well. These and the state of the work are described. Paper text in German.
Ausbildung zum Europäischen Thermischen Spritzer (ETS) mit modernen Lehrmethoden (Education and Training of the European Thermal Sprayer (ETS) by Advanced Training Methods)
Authors: Böhme D. , Ohliger A. , Mayr W. , Voggenreiter H. , Carlson B. , Choms A. , Palme P. , Heinrich P. , Möller P. , Nestler M. , Nicoll A. , Nuno  , Oechsle M. , Oesterberg L. , Sullyvan K. , Zimmermann S. 
Published: May 2022

Abstract
ln co-operation with industrial companies, education and training institutes, and universities, an interactive multimedia learn-ing programme was developed. The project was sponsored over three years by the European Community. Structure and contents of this programme are based on the EWF-guideline “European Thermal Sprayer - Minimum requirements for education and training”. The multimedia programme contains the module of theoretical basis of the training course and covers training subjects as spraying processes, base and spray materials, bonding mechanisms, coating characteristics, measuring and testing, environmental and safety aspects. The interactive multimedia programme may be used to shorten the duration of the ETS-course, for spray company internal education and training, for settling into a new job concerning thermal spray technique, or for supporting a training course itself. The multimedia programme will be demonstrated during the poster sessions. Paper text in German.
Integrated Simulation of Low Pressure Plasma Spraying Process
Authors: Kundas S. , Gurevich V. , Dostanko A. , Ilyuschenko A. , Ivashko V. , Okovity V. , Lugscheider E. , Eritt U. 
Published: May 2022

Abstract
In this paper, a comprehensive mathematical model is developed for the integrated simulation of the coating plasma spraying process under low pressure. This simulation models powder particles that are heated and moved in a plasma jet, the heat transfer in the "coating substrate" system, and the formation of thermal loads. Basic software is developed for the practical implementation of the model. The process of alumina spraying is simulated. Paper includes a German-language abstract.
Modeling of Simultaneous Plasma Spraying of Two Powders
Authors: Dussoubs B. , Vardelle A. , Mariaux G. , Fauchais P. , Themelis N.J. 
Published: May 2022

Abstract
This paper presents a simulation of the simultaneous spraying of a metal and a ceramic powder with different configurations for the injection of the powder into the plasma jet. The plasma jet and the behavior of the injected particles were modeled with a commercially available computational model of the dynamics of liquid bodies. The particles are modeled as discrete Lagrangian objects. Three series of numerical tests were carried out: simultaneous spraying of the powder in a three-dimensional plasma jet in a stable state; simulation of the 3-D plasma flow, assuming that it fluctuates at the same frequency as the arc voltage; and simulation of the effect of the current fluctuation on particle behavior. A pre-calculation with an analytical model made it possible to determine the suitable gas flow rate so that the "average" trajectories of the metal or ceramic powders coincide at the same point on the surface. Paper includes a German-language abstract.
The Role of Feedstock Particle Size on the Microstructural Behavior of Plasma-Sprayed YSZ Deposits During Annealing
Authors: Boukari H. , Allen A.J. , Long G.G. , Wallace J. , Ilavsky J. , Berndt C.C. , Herman H. 
Published: May 2022

Abstract
This paper presents novel results of a series of experiments intended to study the role of the size of the feedstock powder on the microstructure of the deposits. For this purpose, Metco and the feedstock powder, yttria-stabilized (8% wt) zirconia, with number-weighted mean particle sizes of 32, 47, 56, and, 88 micrometer, are used. Small-angle neutron scattering and multiple small-angle neutron scattering (MSANS) methods are applied to determine the microstructure of the four deposits. Companion indentation measurements are performed to determine the elastic moduli of the deposits. The paper also discusses the MSANS 3-void model in relation to the anisotropic elastic properties. Paper includes a German-language abstract.
Factors Influencing the Surface Roughness of TBC Bond Coats
Authors: Zhangxiong D. , Knight R. 
Published: May 2022

Abstract
This paper evaluates different techniques for measuring bond coat surface roughness, explores the influence of different thermal spray processes on the surface roughness of bond coats, and correlates bond coat surface roughness with spray parameters. The results of an evaluation of various techniques for measuring the surface roughness of the adhesive layer including the influence of the thermal spraying process, the powder size, the travel speed, and the coating thickness on the roughness of the thermal barrier coatings (TBCs) adhesive layers are presented. Light microscopy, a needle-tracking profile stylus, and non-contact interferometry with white light are used to characterize the adhesive layer surfaces. The results show that the measurement technique used had significant effects on some of the measured surface roughness values. Paper includes a German-language abstract.
Induction Thermal Plasma Deposition of Mo5Si3-B-Composites
Authors: Fan X. , Ishigaki T. 
Published: May 2022

Abstract
In this paper, induction plasma spray processing is used to produce free-standing-parts of molybdenum silicide-B composition, the boron, and molybdenum silicide powders being blended to form the initial spray powders. The oxidation resistance for each of these composites is compared to those of molybdenum silicide and molybdenum disilicide plasma spray deposits, produced under identical conditions. The results indicated that the 2.0 wt% boron sample had excellent oxidation resistance and showed a mass change of almost zero after 24 hours of high temperature oxidation (1210 deg C). Paper includes a German-language abstract.
Utilization of Iron Scrap for Palm Oil Mill Effluent Treatment by Fenton and Foto-Fenton Processes
Authors: Sari Diana Novita , Amelia Dea , Ramadhon Muhammad David , Tiandho Yuant 
Published: May 2022

The increase in the amount of palm oil production impacts increasing the total liquid waste from the processing of palm oil. Palm oil mill effluent (POME) has high chemical oxygen demand (COD) and biochemical oxygen demand (BOD) parameters that can cause environmental pollution. This study processed POME using the Fenton mechanism using reagents derived from scrap iron. The Fenton mechanism is one of the advanced oxidation process technology (AOPs) in wastewater treatment. To improve the performance of the Fenton mechanism, the researchers integrated it with UV-rays in the photo-Fenton mechanism scheme. Fenton and photo-Fenton processes effectively reduce the pH, BOD, and COD of POME. The COD removal efficiency was 99.91%, while the BOD removal efficiency was 99.93%. The more FeSO4 added to the wastewater, the more significant the reduction of BOD and COD in the Fenton and photo-Fenton processes. Also, photo-Fenton is more effective than the Fenton process to reduce BOD and COD in the POME.Keywords: POME; Fenton; Photo-Fenton; Scrap ironABSTRAKPemanfaatan Besi Bekas untuk Pengolahan Limbah Cair Industri Kelapa Sawit Melalui Proses Fenton dan Foto-FentonMeningkatnya jumlah produksi kelapa sawit, berdampak pada peningkatan total limbah cair dari hasil pengolahan kelapa sawit. Limbah cair industri kelapa sawit atau Palm Oil Mill Effluent (POME) memiliki nilai parameter chemical oxygen demand (COD) dan biochemical oxygen demand (BOD) yang tinggi sehingga dapat menyebabkan pencemaran lingkungan. Di dalam penelitian ini, dilakukan pengolahan POME menggunakan mekanisme Fenton menggunakan reagen yang berasal dari besi bekas. Mekanisme Fenton adalah salah satu pengembangan dari teknologi proses oksidasi maju (AOPs) dalam pengolahan air limbah. Untuk meningkatkan performa dari mekanisme Fenton, peneliti mengintegrasikan system tersebut dengan sinar-UV dalam skema mekanisme foto-Fenton. Proses Fenton dan foto-Fenton sangat efektif dalam menurunkan pH, BOD dan COD dari POME. Efisiensi penyisihan COD mencapai 99,91%, sedangkan efisiensi penyisihan BOD mencapai 99,93%. Semakin banyak FeSO4 yang ditambahkan ke dalam air limbah maka semakin besar reduksi BOD dan COD dalam proses Fenton dan foto-Fenton. Selain itu, foto-Fenton lebih efektif dibandingkan dengan proses Fenton dalam mereduksi BOD dan COD dalam POMEKata kunci : POME; Fenton; foto-Fenton; besi bekas
Secondary Metabolites and Potential Antioxidants of Nutmeg (Myristica fragrans Houtt) Mace from West Java
Authors: Erza Rahmatul Kartini , Karmanah Karmanah , Nurlela Nurlela 
Published: May 2022

Nutmeg mace is a mesh-shaped seed coat that is bright red when the fruit is ripe and yellowish-white when immature, which generally contains secondary metabolites such as flavonoids and phenolics. This study aimed to examine the content of flavonoids and phenolics, the antioxidant activity of ethanol extract of the nutmeg (Myristica fragrans Houtt) mace based on three regions in West Java i.e. Sukabumi, Cianjur, and Bogor District with age differences. Total phenolic content was measured spectrophotometrically using the Folin Ciocalteau reagent. The total flavonoid content was quantitatively measured using the AlCl3 colorimetric method. Antioxidant activity was tested by measuring the IC50 using the 2,2-diphenyl-1-picryl hydrazyl (DPPH) method. The highest phenolic content was found in young nutmeg from Sukabumi Regency (76.40 mgTAE/g). The highest flavonoid content was found in old age mace nutmeg from Bogor Regency (20.33 mgQE/g). Nutmeg mace has the potential as a natural antioxidant because it can reduce free radicals in DPPH with the lowest IC50 of 153.5 mg/L in old mace from Cianjur District.Keywords: Myristica fragrans Houtt; Mace; Phenolic; Flavonoid; Antioxidant ActivityABSTRAKKandungan Metabolit Sekunder Dan Potensi Antioksidan Fuli Buah Pala (Myristica Fragrans Houtt) Dari Jawa BaratFuli pala adalah selubung biji berbentuk jala berwarna merah terang ketika buah sudah matang dan berwarna putih kekuningan ketika belum matang, yang umumnya mengandung senyawa metabolit sekunder diantaranya flavonoid dan fenolik. Tujuan penelitian ini untuk menguji kandungan senyawa flavonoid, fenolik dan aktivitas antioksidan ekstrak etanol fuli pala (Myristica fragrans Houtt) berdasarkan tiga wilayah yaitu Kabupaten Sukabumi, Kabupaten Cianjur dan Kabupaten Bogor dengan perbedaan usia. Kadar total fenolik diukur spektrofotometri menggunakan reagen Folin Ciocalteau, Kadar total flavonoid secara kuantitatif dengan metode kolorimetri AlCl3. Aktivitas antioksidan diuji dengan mengukur nilai IC50 dengan metode 2,2- difenil-1-pikril hidrazil (DPPH). Kadar fenolik tertinggi didapatkan pada pala usia muda dari Kabupaten Sukabumi dengan kadar sebesar 76,40 mgTAE/g. Kadar flavonoid tertinggi didapat pada fuli pala usia tua di Kabupaten Bogor dengan kadar sebesar 20,33 mgQE/g. Fuli buah pala berpotensi sebagai antioksidan alami karena mampu meredam radikal bebas pada DPPH dengan IC50 terendah sebesar 153,5 mg/L yang diperoleh dari fuli usia tua dari Kabupaten Cianjur.Kata kunci: Myristica fragrans Houtt; Fuli; Fenolik; Flavonoid; Aktivitas Antioksidan
The effects of Membrane Lipid Replacement with NTFactor® Lipids on increasing the bioavailability of three test nutrients
Authors: Settineri Robert , Ji Jin , Shields Zenaida P. , Nicolson Garth L. 
Published: May 2022

Introduction: Previous studies indicated that lipids and nanostructured materials may improve the uptake of nutrients with moderate bioabsorption properties. Objectives: This study evaluated the effects of Membrane Lipid Replacement with NTFactor® Lipids (NTFL) on bioabsorption of three poorly to moderately absorbed nutrients (quercetin, curcumin and coenzyme Q10) utilizing the Caco-2 epithelial cell permeability model. Methods: Transfer across a Caco-2 epithelial cell layer has become a reference standard in the pharmaceutical and nutraceutical industries for in vitro prediction of in vivo human intestinal absorption and bioavailability of orally administered substances. The degree of bioabsorption of the test materials was assessed by monitoring the concentrations of the test materials on each side of the Caco-2 monolayers by liquid chromatography and mass spectroscopy (LCMS/MS analysis).Results: When NTFL was added to each of the three test nutrients, there was increased absorption and transfer across a Caco-2 cell layer in a dose-dependent manner for the three nutrients. When compared individually, CoQ10 with NTFL showed the most significant increase in absorption (2.01-times more compared to controls without NTFL, p=0.0011) at a concentration of NTFL of 10 mg/mL. NTFL also increased absorption and transfer across a Caco-2 cell layer of the other test nutrients, but these results did not achieve the same level of significance. Discussion: A variety of Oral membrane lipid replacement supplements with NTFL, such as various vitamins, minerals and nutrients, have been designed to reduce fatigue, improve health conditions, and protect cellular and especially mitochondrial membranes from damage. Here we used NTFL to demonstrate improvements in absorption and bioavailability of three nutrients. Conclusion: Using the Caco-2 bioabsorption and bioavailability in vitro model we found that NTFL could enhance absorption, bioavailability and uptake of nutrients while providing its own clinically demonstrated health benefits. Keywords: Phospholipids, Membrane Lipid Replacement, CoQ10, curcumin, quercetin, bioavailability, absorption, permeability, Caco2, bio-uptake, bioabsorption, glycerolphospholipids, intestinal absorption