bluuebunny/crossref_metadata_2025_split huggingface dataset:
CGS Sprayed Filler Coatings for Brazing of Light Weight Alloys
Authors: Wielage B. , Grund T. , Ahrens S. , Wank A. , Trommer F. 
Published: August 2022

Abstract
Application of cold gas spraying for deposition of braze filler coatings is investigated. Different light weight alloy substrates, i.e. aluminum AA1050, AA3005, AA5754 and AA7022, magnesium AZ91 and titanium TiAl6V4, are used. Filler coating materials depend on the substrate melting temperature. So for aluminum alloys Al12Si and zinc based fillers, for AZ91 pure zinc and for Ti6Al4V different Cu-Ni blends are applied. CGS process parameters are varied with regard to process gas (nitrogen) temperature and pressure, powder feed rate and spray distance. Correlation to process characteristics and economical aspects are given. The usability of the produced filler coatings is shown by different optimized brazing/soldering processes. In case of aluminum braze joints a full metallographical investigation is carried out by optical and scanning electron microscopy as well as EDXS analyses. The gathered results are compared with those of conventional filler material addition, i.e. wire, roll plating and foil.
Effect of Annealing Treatment on the Microstructure and Properties of Cold-Sprayed Cu Coating
Authors: Li W.-Y. , Li C.-J. 
Published: August 2022

Abstract
In the present study, Cu coating was deposited by cold spraying and the electrical resistivity of the coating in both directions parallel and perpendicular to the coating surface was measured to investigate the anisotropy of the coating. Annealing treatment was applied to the coating to examine its effect on the microstructure and properties of cold-sprayed Cu coating. The examination of coating microstructure evidently revealed that the coating was constituted by flattened particles and the interfaces were clearly observed between the deposited particles. The anisotropy in microstructure and electrical resistivity was present in cold-sprayed Cu coating. The electrical resistivity of the as-sprayed coating was higher than that of Cu bulk. Moreover, the electrical resistivity along the direction parallel to the coating surface was lower than that along the perpendicular direction. On the other hand, it was found that the annealing led to the enhancement of particle interface bonding and evident recrystallization of the elongated grains and remarkable grain growth as well. The annealed coating presented an equiaxed grain structures similar to annealed Cu bulk with particle interfaces almost disappeared under certain annealing condition. The coalescence of voids or oxides in the coating was clearly observed at high annealing temperature. Moreover, the annealed coating yielded an electrical resistivity and microhardness comparable to Cu bulk.
Laser Coating and Thermal Spraying - Process Basics and Coating Properties
Authors: Vuoristo P. , Tuominen J. , Nurminen J. 
Published: August 2022

Abstract
The paper describes the some differences of laser coating (laser cladding or laser spraying) process in comparison to thermal spraying. Laser coating is a novel coating process, which produces coatings with high density, metallurgical bonding and low heat input to the substrate. Laser coating types and coating properties are reviewed and compared with thermally sprayed coatings. Typical application areas of laser coatings are presented.
A Multi-Wire ARC-HVOF Hybrid Gun
Authors: Kosikowski D.M. , Stanisic J, J. , Mohanty P.S. 
Published: August 2022

Abstract
This paper presents process development efforts aimed at exploiting the benefits of both the electric arc-spray technique and the High Velocity Oxygen Fuel (HVOF) technique. This so-called hybrid process offers the benefits of using wire stock and high deposition rates of an electric arc-spray gun combined with the higher coating densities obtained using a HVOF gun. Various configurations starting from a single wire arc to 4-wire arc in combination with HVOF have been investigated. Experiments with single material wires to multi-material wire combinations have also been investigated. The feed rates of individual electric arc wire pairs and HVOF powder/wire are controlled independently allowing the creation of functional gradient materials (FGM). This gun has been used to create alloys as well as patterned deposits of different materials. The ability to create in-situ alloys and patterned deposits with excellent quality has been demonstrated.
Parametric Study of the Transient Cooling During Suspension D. C. Plasma Spraying of Stabilized Zirconia
Authors: Naoua S.B. , El Ganaoui M. , Fauchais P. , Sammouda H. 
Published: August 2022

Abstract
A numerical study has been conducted on yttria stabilized zirconia and molybdenum splat cooling taking into account the effects of various parameters. In particular, the effect of the splat thickness, the splat/substrate interface thermal resistance, the latent heat of solidification and the substrate initial temperature on the solidification occurrence and kinetics have been studied. A two-dimension model of heat transfer taking into account the phase change during rapid solidification with an enthalpy formulation has been used for these calculations.
Microstructure Characterization of Thermal Barrier Coating Deposits – Practical Models from Measurements
Authors: Ilavsky J. , Allen A.J. , Dobbins T. , Kulkarni A. , Herman H. 
Published: August 2022

Abstract
Advances in the functional properties of thermal barrier coating (TBC) deposits are important for increasing the efficiency of, and reducing emissions from both stationary and aircraft turbine engines. Computer modeling is the preferred method for developing new materials with minimum cost and development time. However, modeling of TBCs is complex and must take into account interactions among the layers and with the substrate, in-service phase changes, oxidation, and stress development. Understanding the microstructure of the ceramic layer is important for building these models, as it strongly influences the properties responsible for the basic TBC function – thermal resistance. As is well known the ceramic microstructure changes in service, potentially leading to coating and engine failure. A major challenge is ensuring that the model reliably describes the actual material. Thus, it is important to develop representative models, which can be related to real practical coating systems. We present such a model. It has been developed to interpret small-angle X-ray scattering data that characterize TBC ceramic deposit microstructures. This model is also suitable for incorporation into computer algorithms such as are used in finite-element analysis. Quantitative parameters that describe the microstructure changes occurring under service conditions are readily obtainable for current systems, and these can then be re-measured for future materials of interest.
Numerical Study of Particle In-Flight Characteristics in a RF Induction Plasma Spray
Authors: Xiong H.B. , Zheng L.L. , Zhang M.Y. , Zhang H. , Margolies J. , Sampath S. 
Published: August 2022

Abstract
Precursor Plasma Spraying (PPS) using Radio Frequency (RF) induction plasma spray is a new process used to synthesize functional materials. RF plasma spray has the advantages of stability, cleanness, high temperature and high chemical reactivity. In this paper, a two-dimensional numerical model has been developed to investigate the induction electromagnetic (EM) field and the thermo-fluid field in a radio frequency inductively coupled plasma (RF-ICP). In flight particle interaction with the plasma jet will be investigated. The traditional micron-size powder particles, e.g. zirconia (PSZ), are injected with carrier gas such as argon. During their interaction with the RF plasma, the powder particles experience acceleration, heating, melting and evaporation and particle heat transfer is considered coupled with the thermo-fluid flow of the RF plasma. A generalized particle model is developed and applied to the precursor plasma spray process operated in a vacuum chamber. The effects of power input, standoff distance and powder size on the RF plasma and particle in flight characteristics are investigated.
New Thermal Spray Coatings from WC-VC-Co Powders
Authors: Machio C.N. , Luyckx S. , Zimmermann S. , Keller H. 
Published: August 2022

Abstract
Thermal spray coatings were deposited by the HVOF technique using two grades of WC-VC-Co powders (WC- 10VC-12Co and WC-10VC-17Co), produced by agglomeration and sintering, from WC, VC and Co starting powders. The coatings were sprayed by a commercial enterprise producing WC-Co thermal spray coatings, using the same spray parameters as for WC-Co coatings. This paper presents results from the characterization of the powders as well as the results of abrasion and erosion tests performed under identical conditions on the new WCVC- Co coatings and on standard WC-Co coatings of equal cobalt content. Under many conditions, the WC-VC-Co coatings performed better than the standard coatings, despite their deposition conditions not having been optimized.
Microstructure Analysis of Thermally Sprayed Abradable Coatings
Authors: Faraoun H.I. , Seichepine J.-L. , Aourag H. , Coddet C. , Grosdidier T. , Zwick J. , Hopkins N. 
Published: August 2022

Abstract
This paper reports morphological study of coatings microstructure performed on two selected reference abradable materials: AlSi-hBN and NiCrAl-Bentonite. Scanning Electron Microscopy (SEM) was used to obtain adequate micrographs for analysis. The porosity and non-metal particles morphology was assimilated to elliptical inclusions within the metallic matrix. Accordingly, they were described by means of three different geometrical parameters related to the shape, size and orientation distribution, allowing additional statistical analysis on the coatings.
Analysis of Thermal Fluxes from an Impinging HVOF Jet
Authors: Klein D. , Bolot R. , Verdy C. , Coddet C. 
Published: August 2022

Abstract
The knowledge of thermal fluxes transferred from impinging high temperature jets is always important. For example, during thermal spray applications, the impinging jet acts directly on the transient surface temperature of the substrate. For preheating applications, it acts on the time required to reach the required surface temperature. It is also important to estimate it for some other applications like thermal cycling tests of parts for example. In the present paper, both CFD computations and experiments were carried out in order to quantify thermal fluxes from an impinging HVOF jet. The case of a CDS gun fueled by natural gas was considered. Stand-off distances ranging from 50 mm up to 300 mm were investigated. The model incorporates a 2-layer extension to k-å models for a better estimation of thermal exchanges through the viscous layer on the front body surface. The experiments were performed using a system incorporating two square calorimeters positioned one beside the other in order to attempt defining a radial profile. Abstract only; no full-text paper available.
Introduction
Authors: Aragüete-Toribio Zahira 
Published: August 2022

English Abstract:
In recent (post-)conflict scenarios, the diversity and complexity of mass violence, including acts of enforced disappearance and extrajudicial or summary executions, have transformed how knowledge about such crimes is performed and produced socially. In inquiries into human rights violations, the search for, exhumation and identification of missing bodies often buried in mass graves have led distinct applications of forensic work to emerge. These have some differences from traditional crime scene investigation approaches. Novel interactions between forensic science practitioners and the communities where they operate have given place to unprecedented sociocultural, affective and scientific understandings of evidencing mass crimes. Drawing on different ethnographic experiences of unearthing human remains around the world, this collection considers how, in its judicial but also its extrajudicial application, forensic expertise has been transformed in connection to other epistemologies, collective and individual mourning, kinship, memory and a new politics and ethics of care in distinct state- and civil society-led pursuits to account for the dead and missing.French Abstract:
Dans les scénarios récents de (post-)conflit, la diversité et la complexité de la violence de masse (y compris les actes de disparition forcée et les exécutions extrajudiciaires ou sommaires) ont transformé la manière dont la connaissance de ces crimes est acquise et produite socialement. Dans le cadre des enquêtes sur les violations des droits de l’homme, la recherche, l’exhumation et l’identification des corps disparus, souvent enterrés dans des fosses communes, ont suscité l’émergence d’applications distinctes du travail médico-légal. Celles-ci diffèrent des approches traditionnelles des enquêtes sur les scènes de crime. Les nouvelles interactions entre les praticiens de la médecine légale et les communautés où ils opèrent ont donné lieu à des compréhensions de la mise en évidence des crimes de masse socioculturelles, affectives et scientifiques sans précédent. En s’appuyant sur différentes expériences ethnographiques de mise au jour de restes humains à travers le monde, cette collection examine comment, dans son application judiciaire mais aussi extrajudiciaire, l’expertise médico-légale a été transformée en relation avec d’autres épistémologies, le deuil collectif et individuel, la parenté, la mémoire, ainsi qu’une nouvelle politique et une nouvelle éthique de la prise en charge dans le cadre des efforts distincts menés par l’État et la société civile pour rendre compte des morts et des disparus.
Managing Mass Graves in Rwanda and Burundi
Authors: Jamar Astrid , Major Laura 
Published: August 2022

English Abstract:
The governments of Rwanda and Burundi exhume mass graves with the promise of revealing truths about the contested histories of past conflict and genocide. In Rwanda, exhumations recover and conserve the bodies of victims of the genocide against the Tutsi. Since December 2019, the Truth and Reconciliation Commission in Burundi has also begun mass exhumations; these efforts are motivated by truth-seeking and reconciliation aspirations that articulate a specific narrative of victimhood and state legitimacy. The state employs vernacularised forms of forensic practices and ‘international’ rights-based discourses in both cases. Drawing on our respective ethnographic fieldwork, we describe and analyse exhumation practices in Rwanda and Burundi. The ‘forensic turn’ in post-conflict settings has been the subject of much discussion and debate among scholars since the proliferation of the practice over recent decades. We add to these debates in our consideration of two linked settings in which the exhumations had become powerful political tools, in this case serving as a source of power for specific regimes.French Abstract:
Les gouvernements du Rwanda et du Burundi exhument des fosses communes en promettant d’éclaircir les vérités sur les histoires contestées des conflits et des génocides passés. Au Rwanda, les exhumations ont été organisée pour récupérer et conserver les corps des victimes du génocide contre les Tutsis. Depuis décembre 2019, la Commission Vérité et Réconciliation au Burundi a également entamé des exhumations de masse ; ces efforts sont motivés par des ambitions de recherche de la vérité et de réconciliation articulées autour d’un récit spécifique de victimisation et de légitimation de l’État. Dans les deux cas, l’État utilise des formes vernacularisées de pratiques médico-légales et des discours « internationaux » fondés sur les droits. En nous appuyant sur nos travaux ethnographiques de terrain respectifs, nous décrivons et analysons les pratiques d’exhumation au Rwanda et au Burundi. Le tournant médico-légal » dans les contextes post-conflits a fait l’objet de nombreuses discussions et débats parmi les chercheurs depuis la prolifération de ces pratiques au cours des dernières décennies. Nous contribuant à ces débats en examinant deux contextes liés dans lesquels les exhumations sont devenues de puissants outils politiques, servant dans ce cas de source de pouvoir pour des régimes spécifiques.
Silent Stock
Authors: Anstett Élisabeth 
Published: August 2022

English Abstract:
Mass exhumations and the mass unearthing of dead bodies are quite new phenomena in the history of humankind. The ‘forensic turn’ has led various disciplines to pay renewed attention to the dead and not only to the death. For a couple of decades, social anthropologists have been urged to (re)consider the materiality of death. This return of the dead bodies en masse has consequently made them look carefully at the ways in which corpses are dealt with in various situations of disasters or mass crime, but also made them aware of the various silences and denial mechanisms lastingly surrounding mass graves and buried corpses. This afterword aims to reflect on the way these silences and denial have shaped our disciplinary field and maintained some of its blind spots.French Abstract:
Les exhumations et la mise au jour massives de cadavres sont des phénomènes plutôt nouveaux dans l’histoire de l’humanité. Le tournant médico-légal a conduit diverses disciplines à accorder une attention renouvelée aux morts et pas seulement à la mort. Pour leur part, les anthropologues sociaux ont été incités depuis quelques décennies à (re)considérer la matérialité de la mort. Ce retour en masse des cadavres les a, par conséquent, amenés à se pencher sur la manière dont les cadavres sont traités dans des situations de catastrophes ou de crimes de masse, mais aussi à prendre conscience des divers silences et mécanismes de déni qui entourent durablement les fosses communes et les cadavres enterrés. Cette postface vise à réfléchir à la manière dont ces silences et ces dénis ont façonné notre champ disciplinaire et maintenu certains de ses angles morts.
Prevalence and Ascertainment of Dementia Cases in the Malmö Diet and Cancer Study
Authors: Nägga Katarina , Bränsvik Vanja , Stomrud Erik , Melander Olle , Nilsson Peter M. , Gustavsson Anna-Märta , Hansson Oskar 
Published: August 2022

Background: Register diagnoses, both hospital-based and from open clinic care, are often used in research studies in Sweden. The validity of such diagnoses has been debated and a validation assessment can improve the diagnostic accuracy for use in research studies. Objective: The aim of this study was to investigate the quality of register-derived dementia diagnoses in the Malmö Diet and Cancer population study (MDCS) and to validate these diagnoses using systematic criteria. Methods: MDCS is a population-based prospective study comprising 30,446 participants. Register diagnoses of dementia for the MDCS population were derived from the Swedish National Patient Register (NPR) and validated through re-evaluation of available medical records by physicians. Results: In the MDCS cohort, 2,206 participants were diagnosed with dementia according to the NPR during a mean follow-up of 18.1 years. The general dementia diagnosis was valid in 96% of the cases, but 40% of the specific dementia diagnoses were changed during the process of reevaluation. The diagnostic validity varied between 25.2% and 82.9% for the different diagnoses. The results from the validity assessment per diagnostic category revealed that the validity of the NPR diagnoses was higher for the more specific diagnoses and lower for unspecified dementia. The major diagnostic shift during the re-evaluation was from unspecified dementia to more specific diagnoses. Conclusion: Validation of dementia diagnoses using medical records results in more precise diagnoses. Dementia diagnoses derived from registers should be validated in order to study associations between influential factors and different dementia diagnoses.
Analisis Perbedaan Hasil Belajar pada Pembelajaran Matematika Secara Daring dan Luring Siswa Kelas V SDN Tegal Alur 21 Petang
Authors: Fitria Mellynda Nurul , Sukmawati Wati 
Published: August 2022

Learning that has been carried out online during the Covid-19 pandemic, especially in Indonesia, is now with conditions starting to stabilize, the government has allowed learning to take place offline or face-to-face, this of course creates problems for the world of education. This research was conducted with the aim of being able to answer questions in an empirical form on the differences between online learning and offline learning in mathematics subjects with the volume of geometric figures seen on student learning outcomes. The method applied to the research is descriptive quantitative approach, while the students who are used as samples in this study are class V students. From the research that has been successfully completed, the data is obtained through instrument tests and interviews with students and teachers, this research was conducted as an evaluation of online and offline learning during the pandemic and post-pandemic.. The results of the study found that students have an average value of online learning that is greater than offline learning. In the results of hypothesis testing it was found that is 4,910 greater than is 4,10, so there are significant results, that there is a difference in learning outcomes in online learning and offline learning. This is also increasingly supported by the results of interviews that have been conducted with students and teachers.

Pembelajaran yang telah dilakukan secara daring ketika adanya pandemi covid-19 terutama di Indonesia, kini dengan kondisi yang mulai stabil, pemerintah mengizinkan kembali pembelajaran berlangsung secara luring atau tatap muka. Hal ini tentunya menimbulkan permasalahan bagi dunia pendidikan. Penelitian ini dilakukan dengan tujuan agar dapat menjawab pertanyaan dalam bentuk empiris terhadap perbedaan pembelajaran daring dengan pembelajaran luring pada mata pelajaran matematika materi volume bangun ruang dilihat terhadap hasil belajar siswa. Metode yang diterapkan pada penelitian yaitu metode deskriptif pendekatan secara kuantitatif, adapun siswa yang dijadikan sebagai sampel dalam penelitian ini adalah siswa kelas V. Dari penelitian yang sudah berhasil diselesaikan data didapatkan melalui tes instrumen soal dan wawancara kepada siswa dan guru, penelitian ini dilakukan sebagai evaluasi terhadap pembelajaran daring dan luring semasa pandemi dan pasca pandemi. Hasil penelitian ditemukan siswa memiliki rata-rata pada nilai pembelajaran daring lebih besar daripada pembelajaran secara luring. Pada hasil uji hipotesis ditemukan bahwa sebesar 4,910 lebih besar dari 4,10, maka terdapat hasil yang signifikan, bahwa adanya perbedaan dari hasil belajar pada pembelajaran secara daring dengan pembelajaran secara luring. Hal tersebut juga semakin di dukung atas hasil wawancara yang telah di lakukan kepada siswa dan guru.