bluuebunny/crossref_metadata_2025 huggingface dataset:
Pendampingan Pengelolaan Website UPT.PJP UMI (Pusat Jurnal dan Publikasi) untuk Peningkatan Pemeringkatan Webometrics
Authors: Anraeni Siska , Alwi Erick Irawadi , Belluano Poetri Lestari Lokapitasari , Gaffar Andi Widya Mufila , Satra Ramdan , Syafie Lukman
Published: March 2024

Saat ini, UPT PJP UMI telah memiliki website, namun pengelolaannya belum memenuhi standar penilaian webometrics, sehingga belum optimal dalam mempengaruhi peringkat webometrics UMI. Beberapa permasalahan muncul, seperti performa website yang mendapatkan nilai "B" berdasarkan pengukuran GTMetrix, jumlah backlink yang masih kurang, dan konten berita yang belum menggunakan standar SEO. Kegiatan pengabdian terfokus pada sosialisasi peningkatan pemeringkatan webometrics dan pendampingan dalam workshop manajemen konten website berbasis SEO. Hasil dari kegiatan ini mencakup peningkatan pemahaman pemeringkatan webometrics, peningkatan kemampuan pengelolaan website mitra, serta penyerahan modul "Pedoman Pengelolaan Website Berdasarkan Penilaian Webometrics" kepada UPT.PJP UMI. Hasil kegiatan ini berhasil mencapai tujuannya dengan memberikan kontribusi positif dalam meningkatkan kualitas pengelolaan website UPT.PJP UMI berdasarkan standar penilaian webometrics. Perolehan hasil persentase kuisioner pre dan posttest menunjukkan bahwa dari 10 orang peserta sosialisasi dan workshop mengalami peningkatan pemahaman tentang pemeringkatan webometrics dari 54% menjadi 76%. Diharapkan dengan peningkatan pemahaman peserta pelatihan dapat memberikan arah perubahan pemeringkatan webometrics UMI menjadi lebih baik di Tahun 2024 nantinya.
Peningkatan Keterampilan Menulis Naskah Jurnalistik Radio melalui Pelatihan Berbasis Partisipatif pada Siswa-Siswi SMA Negeri 5 Kota Semarang
Authors: Ernawati Arni , Patriantoro Teguh Hartono , Yulianto Lukas , Astuti Erna Zuni , Prasongko Akbar Bagus , Oktavianto Damar
Published: March 2024

Keterampilan menulis merupakan keterampilan penting yang harus dimiliki oleh setiap individu, termasuk siswa-siswi SMA. Keterampilan menulis naskah jurnalistik merupakan salah satu bentuk keterampilan menulis yang penting untuk dikuasai oleh siswa-siswi SMA. SMA Negeri 5 Kota Semarang memiliki program jurnalistik radio, namun masih menemui kendala dalam hal keterampilan menulis naskah jurnalistik radio. Oleh karena itu, diperlukan upaya untuk meningkatkan keterampilan menulis naskah jurnalistik radio bagi siswa-siswi SMA Negeri 5 Kota Semarang. Pengabdian ini bertujuan untuk meningkatkan keterampilan menulis naskah jurnalistik radio melalui pelatihan berbasis partisipatif pada siswa-siswi SMA Negeri 5 Kota Semarang. Pelatihan ini dilaksanakan dengan menggunakan menggunakan metode Pendekatan Participatory Action Research (PAR)" membahas tentang upaya meningkatkan keterampilan menulis naskah jurnalistik radio pada siswa SMA Negeri 5 Kota Semarang melalui pelatihan berbasis partisipatif. Metode pendekatan Participatory Action Research (PAR) digunakan untuk menekankan partisipasi aktif siswa-siswa dalam proses pengabdian dan pengambilan keputusan. Hasil penelitian menunjukkan bahwa pelatihan berbasis partisipatif dapat meningkatkan keterampilan menulis naskah jurnalistik radio siswa SMA Negeri 5 Kota Semarang. Pelatihan ini pengabdi melibatkan siswa dalam proses pembelajaran dan memberikan kesempatan kepada siswa untuk mengekspresikan diri, menyampaikan informasi, dan memecahkan masalah. Dengan demikian, pelatihan berbasis partisipatif dapat menjadi langkah yang efektif dalam meningkatkan keterampilan menulis naskah jurnalistik radio pada siswa SMA Negeri 5 Kota Semarang.
ScholarOne - An Iterative Cluster Building Process to Detect Test Collusion
Authors: Wollack James , Sahin Sakine Gocer
Published: March 2024

This paper proposes a new method for identifying groups of examinees
engaged in collusion that does not require any a priori knowledge of the
compromised items. The method, called iterative cluster building (ICB),
constructs clusters through an answer similarity framework, sequentially
accepting into the cluster examinees whose responses are statistically
the most similar to the union of all responses already in the cluster.
ICB was evaluated through both simulation and application to a commonly
used empirical dataset with known preknowledge. Results from the study
were highly encouraging. ICB recovered simulated groups very well, while
limiting Type I errors to realistic levels commonly used in operational
settings. Application of ICB to the empirical dataset resulted in
larger, more homogeneous clusters than have previously been observed
Harnessing the Computing Continuum across Personalized Healthcare, Maintenance and Inspection, and Farming 4.0
Authors: Baghdadi Fatemeh , Lomurno Eugenio , Cirillo Davide , Vazquez Fernando , Lordan Francesc , Lezzi Daniele , Archetti Alberto , Ardagna Danilo , Matteucci Matteo
Published: March 2024

The AI-SPRINT project, launched in 2021 and funded by the European Commission, focuses on the development and implementation of AI applications across the computing continuum. This continuum ensures the coherent integration of computational resources and services from centralized data centers to edge devices, facilitating efficient and adaptive computation and application delivery. AI-SPRINT has achieved significant scientific advances, including streamlined processes, improved efficiency, and the ability to operate in real time, as evidenced by three practical use cases. This paper provides an in-depth examination of these applications - Personalized Healthcare, Maintenance and Inspection, and Farming 4.0 - highlighting their practical implementation and the objectives achieved with the integration of AI-SPRINT technologies. We analyze how the proposed toolchain effectively addresses a range of challenges and refines processes, discussing its relevance and impact in multiple domains. After a comprehensive overview of the main AI-SPRINT tools used in these scenarios, the paper summarizes of the findings and key lessons learned.
The Relationship of Academic Stress and Body Mass Index (BMI) with Premenstrual Syndrome in Class 9 Students of SMPN 1 Sumberpucung
Authors: Yunisari Siti Zulaika , Panggayuh Ardi , Kusmiwiyati Ari
Published: March 2024

Menstruation is bleeding that repeats every month and indicates that the female reproductive organs are ready to be fertilized. In the menstrual cycle, changes in hormone levels will occur when a young woman will experience menstruation. This can affect changes in the physical and emotional conditions of adolescent girls before menstruation, which is commonly referred to as premenstrual syndrome (Ministry of Women and Children Empowerment of the Republic of Indonesia, 2015). The prevalence of premenstrual syndrome in Indonesia is 70-90% in women of childbearing age and it is found that 2-10% are experiencing severe symptoms of premenstrual syndrome (Sari and Priyanto, 2018). The purpose of this study was to determine the relationship between academic stress and body mass index (BMI) with premenstrual syndrome in 9th grade students of SMPN 1 SUMBERPUCUNG. This type of research is a correlation design that uses a cross sectional approach. A sample of 31 9th grade students were selected using a total sampling technique. In research using Spearman Rank data analysis, there is a relationship between academic stress and premenstrual syndrome which results in value < (0.002 < 0.05). Meanwhile, the relationship between body mass index (BMI) and premenstrual syndrome produces a value of value < (0.015 < 0.05). based on the results of this study, students should be able to manage and control their emotions so that stress does not occur and always maintain a pattern eat to stay at a normal BMI.
Representasi Feminisme dalam Drama Netflix “The Glory Season 1” (Analisis Semiotika John Fiske)
Authors: Safitri Dewi
Published: March 2024

Media massa adalah alat penting bagi masyarakat untuk berkomunikasi dan menyampaikan informasi. Media massa memengaruhi sikap dan perilaku manusia, serta memiliki fungsi pendidikan, pengaruh, informasi, dan hiburan. Drama adalah salah satu bentuk media massa yang dapat mengangkat isu-isu sosial, termasuk kesetaraan gender. Feminisme adalah gerakan yang memperjuangkan kesetaraan gender, dan drama seringkali mencerminkan pandangan feminisme. Drama Korea, seperti K-Drama, sangat populer dan sering mengangkat isu bullying dan kekerasan dalam rumah tangga, terutama terhadap perempuan. Beberapa drama menggambarkan perempuan sebagai sosok yang hanya fokus pada penampilan mereka, sementara yang lain menampilkan perempuan yang kuat dan berani seperti karakter Moon Dong-eun dalam "The Glory Season 1. Drama  "The Glory Season 1" merupakan sebuah drama yang mengangkat isu-isu penting terkait feminisme dan representasi perempuan. Drama ini menyoroti perlakuan tidak adil yang dialami perempuan dan menampilkan karakter Moon Dong-eun sebagai perwujudan perempuan yang kuat dan berani. Dalam penelitian ini, menggunakan metode penelitian kualitatif deskriptif dengan pendekatan etnografi dan analisis semiotika John Fiske. Hasil penelitian menunjukkan bahwa film ini menggambarkan pentingnya keadilan, keberanian, dan peran aktif perempuan dalam mencapai kesetaraan gender. Kesimpulannya, film "The Glory Season 1" memperlihatkan narasi feminisme yang menginspirasi dan menekankan peran penting perempuan dalam mengubah nasib dan mendapatkan perlakuan yang setara.

Kata Kunci : Feminisme, Semiotika John Fiske, The Glory Season 1
Evaluation of the Attitudes and Opinions of Veterinary School Students on Distance Education During the COVID-19 Pandemic
Authors: Aslım Gökhan , Tekindal Mustafa Agah , Yiğit Ali , Sanal Şule , Menteş Ayşe
Published: March 2024

This study aimed to determine the attitudes and opinions of the students of veterinary schools in Turkey regarding distance education during the COVID-19 pandemic. The study was conducted in two stages: (1) to develop and validate a scale for assessing Turkish veterinary students’ attitudes and opinions regarding distance education (DE) ( n = 250 students; one veterinary school) and (2) widespread use of this scale amongst veterinary students ( n = 1,599 students, 19 veterinary schools). Stage 2 was conducted between December 2020 and January 2021 with students from years 2, 3, 4, and 5 who had experienced face-to-face and distance education. The scale contained 38 questions, which were divided into seven sub-factors. Most students considered that practical courses (77.1%) should not continue to be delivered by DE and that catch-up face-to-face programs (77%) would be required for practical skills after the pandemic. The main benefits of DE were that studies did not have to be interrupted (53.2%) and the ability to retrieve online video material for later study (81.2%). A total of 69% of students considered DE systems and applications easy to use. Many (71%) students considered that the use of DE would adversely affect their professional skills, 26.5% expected that the duration of their studies would be extended, but only 18.1% had considered suspending their studies for the period of the pandemic. Therefore, it appeared that face-to-face education was considered indispensable by students in veterinary schools, which provides practice-oriented education in the field of health sciences. However, the DE method can be used as a supplementary tool.
Covid-19 Pandemi Sürecinde Veteriner Fakültesi Öğrencilerinin Uzaktan Eğitime İlişkin Tutum ve Görüşlerinin Değerlendirilmesi
Authors: Aslım Gökhan , Tekindal Mustafa Agah , Yiğit Ali , Sanal Şule , Menteş Ayşe
Published: March 2024

ÖZET

Bu çalışmanın amacı, Covid-19 pandemisi sürecinde Türkiye’deki veteriner fakültesi öğrencilerinin uzaktan eğitime ilişkin tutum ve görüşlerini belirlemektir. Çalışma iki aşamada gerçekleştirilmiştir: Birinci aşamada, veteriner fakültesi öğrencilerinin uzaktan eğitime (UE) ilişkin tutum ve görüşlerini değerlendirmek için bir ölçek geliştirilmiş ve doğrulanmış ( n = 250 öğrenci; bir veteriner fakültesi); ikinci aşamada geliştirilen bu ölçek veteriner fakültesi öğrencilerine uygulanmıştır ( n = 1.599 öğrenci, 19 veteriner fakültesi). İkinci Aşama, Aralık 2020 ve Ocak 2021 tarihleri arasında hem yüz yüze hem de uzaktan eğitimi deneyimlemiş 2, 3, 4, ve 5. sınıf öğrencileri ile gerçekleştirilmiştir. Ölçek, yedi alt faktöre ayrılan 38 soru içermektedir. Öğrencilerin çoğu, uygulamalı derslerin (%77,1) UE yöntemiyle verilmeye devam edilmemesi gerektiğini ve pandemi sonrasında pratik beceriler için telafi yüz yüze programların (%77) gerekli olacağını düşünmektedir. UE’nin başlıca faydaları, çalışmaların kesintiye uğramaması (%53,2) ve daha sonra çalışmak için çevrimiçi video materyaline ulaşılabilmesidir (%81,2). Öğrencilerin %69’u UE sistem ve uygulamalarının kullanımının kolay olduğunu düşünmektedir. Öğrencilerin çoğu (%71) UE kullanımının mesleki becerilerini olumsuz etkileyeceğini düşünürken, %26,5’i eğitim sürelerinin uzamasını beklemekte, ancak sadece %18,1’i pandemi süresince eğitimlerine ara vermeyi düşünmektedir. Dolayısıyla, sağlık bilimleri alanında uygulama odaklı eğitim veren veteriner fakültelerinde yüz yüze eğitimin öğrenciler tarafından vazgeçilmez görüldüğü ortaya çıkmıştır. Bununla birlikte, UE yöntemi tamamlayıcı bir araç olarak kullanılabilir.
Evaluating the Educational Experience of Physiotherapy Students Using the Fitness and Mobility Exercise (FAME) Programme to Learn about Neurological Conditions: An Exploratory Study
Authors: Gueret Joanna , Eng Janice J. , Stelling Sally-Anne , Pollock Courtney L. , Peters Sue
Published: March 2024

Purpose:

Group exercise has the potential to be a cost-effective way to improve functional outcomes for those living with neurological injury. Leading group exercise is a foundational competency for entry-to-practice for physiotherapy students. The overall objective of this study was to examine the student experience of using the Fitness and Mobility Exercise (FAME) programme to learn about neurological conditions in a group setting.

Methods:

Sixteen physiotherapy students filled out a single point in time survey at the end of their placement during which they had the opportunity to use FAME with their clients twice a week. The survey had Likert and open-ended questions and demographic information. Likert responses were calculated as means. Open-ended questions were analyzed using thematic analysis.

Results:

The Likert questions were answered with almost entirely positive results. The main themes from the open-ended questions were how to personalize the class, characteristics of individual clients shape the class experience and factors that make the class successful.

Conclusions:

Overall, the physiotherapy students found using FAME to be a positive experience. From the student perspective, using FAME during placement was an effective way to learn about neurological conditions as well as to develop skills to manage a group exercise class.
High Pressure Heat Treatment—Optimized Material Properties by HIP
Authors: Hjarne Johan , Ahlfors Magnus , Eklund Anders
Published: March 2024

Hot Isostatic Pressing (HIP) is widely used today to eliminate internal defects in components to achieve improved material properties like ductility and fatigue. With today’s modern HIP systems there are possibilities to incorporate more process steps into the HIP process. These process steps can be stress relief, solutionizing, quenching, ageing, tempering etc. performed in the same equipment during the same cycle which makes a very effective process route. This presentation will focus on the possibilities to perform solutionizing and quench directly in the HIP system for a typical QT steels and evaluate how HIP quench compares to water and oil quench as well as how the austenite to perlite transformation react under pressure.
On Predicting Quenched and Tempered Hardness of Mixed Microstructures using Steel Chemistry
Authors: Athavale Viraj A. , Van Aken David C.
Published: March 2024

A method of predicting tempered hardness of mixed microstructures has been formulated, which uses the quenched hardness and steel chemistry as independent variables. This calculation is based upon a method first proposed in 1947 by Crafts and Lamont for mixed microstructures and modified using the 1977 chemistry-based, tempered martensite hardness calculation of Grange, Hribal, and Porter. Tempered hardness predictions were examined using Jominy end-quench bars tempered between 204°C (400°F) and 649°C (1200°F). The measured Jominy hardness after tempering was used to make adjustments to the Crafts and Lamont parameters used in the hybrid model. Both plain carbon (SAE 1045) and low alloy (SAE grades 8620, 4130, 4142, and 5160) were used to evaluate the chemistry-based hardness prediction. In combination with a ASTM A255 Jominy hardenability calculation, the proposed calculation can be used to predict the quenched and tempered hardness profile of a round bar based upon chemistry, quench severity, and tempering temperature.
Everything Matters to Reach ASM HTS’s Vision 2020 Goals
Authors: Powell Joseph A.
Published: March 2024

In 1999, ASM’s Heat Treating Society set forth a view of what the ideal future for the heat treating industry would be by the year 2020. Among the goals is to “Achieve zero distortion and maximum uniformity in heat treated parts.” Since heat treating is a crosscutting technology, it affects, and is affected by, many aspects of part design and manufacture. All the parties in the lean manufacturing value chain, including the heat treater, must realize that “everything matters” when trying to eliminate waste. Lean concurrent engineering teams must collaborate to integrate their innovations, they develop seamlessly, into the methods and equipment they use to make and to market their products. The author will review the 1999 ideals set forth in Vision 2020 and how far we have come as of 2017. The author combines his dual perspectives performing traditional commercial heat treating for over 35 years for over 1,200 different customers, as well as his work with many lean part making customers and “heat treat waste-fighting” colleagues commercializing advanced heat treat quenching methods and equipment since 1997.
Induction Heating Nonferrous Metals—Physical Characteristics and Process Optimization
Authors: Russell Collin , Pleshivtseva Yulia
Published: March 2024

While the induction heating of non-ferrous alloys is fundamentally no different than that of other metals, the unique physical properties of different non-ferrous alloys have a number of critical induction heating implications. This paper addresses a number of physical characteristics and practical subtleties associated with the induction heating of non-ferrous alloys, focusing particularly on the influence of electromagnetic and thermal material properties. A mathematical optimization routine for continuous induction heating processes is also presented. Utilizing coupled electromagnetic-thermal FEA computer simulation results and taking into account real-world process requirements, this routine is used to maximize induction heating quality and equipment performance.
Development of Ausferritic Microstructure in a Medium Carbon Steel
Authors: Alshwigi Mohamed , Putatunda Susil K.
Published: March 2024

This paper reports on a study to investigate the creation of a mixed microstructure consisting of proeutectoid ferrite, bainite, and austenite in a medium carbon high silicon steel. The microstructure was produced through the use of a continuous cooling process at a moderate cooling rate from the austenitizing temperature range to room temperature. The investigation also examined the influence of this microstructure on the mechanical properties of the material. Test results indicate that the developed steel has better mechanical properties compared to commercially available dual phase steels.
Influence of Test Method and Microalloy Additions on Measured Austenite Grain Size of Heat Treated SAE 1045 Steel
Authors: Cryderman Robert , Hyer-Petersen Dane , Glodowski Robert
Published: March 2024

The austenite grain size (AGS) developed immediately before final cooling by quenching or other means is known to exert a substantial effect on the resistance to fracture in the final part. SAE 1045 steels containing Al, V, and V+Nb and a nonmicroalloyed steel were preconditioned by various thermomechanical treatments and then assessed for AGS by several methods defined in ASTM E112-13. Test results show that the microalloys present, the test method selected to evaluate the AGS, and the condition of the steel prior to conducting the grain size tests all have substantial effects on the measured AGS. The results demonstrate that for a meaningful AGS specification and test result, it is necessary to specify the precondition of the steel, the test method, and the test conditions.
Life Extension of High-Temperature Structural Alloys RA602CA in Gas Carburizing Atmosphere
Authors: Wang Anbo , Yu Haixuan , Sisson R. D.
Published: March 2024

Extension of the service life for high temperature structural alloy RA602CA is the goal for the project described in this paper. The performance of alloy RA602CA and aluminized RA602CA in a gas carburization furnaces were studied for periods up to two years. Aluminizing treatments (widely used in aerospace industry, especially in turbine blade applications) were also studied in this project. Carbon has very low solubility in alumina, so aluminizing could be a good method for protecting RA602CA alloys. Microstructural development during the carburizing process is presented, and the degradation of chromium oxide as well as alumina oxides is identified. The weight gain of RA602CA compared to similar alloys is discussed.
Effects of Forming Route and Heat Treatment on the Distortion Behavior of Case-Hardened Martensitic Steel type S156
Authors: Easton David , Perez Marcos , Huang Jianglin , Rahimi Salaheddin
Published: March 2024

The distortion behavior of carburized and fully heat treated Ni-Cr-Mo martensitic steel (S156) has been experimentally evaluated. Dimensional measurements of Navy C-ring distortion coupons during interrupted heat treatment process for parts manufactured from two forming routes, hot forging and machined from as received bar, was performed. Metallurgical analysis was carried out to attempt to relate the observed microstructural characteristics with measured process induced distortion. The carburization process was found to be the most severe in terms of inducing distortion. It was found that additional heat treatments during the process results in a larger final distortion. Machining parts from forgings results in higher distortions than that of those machined directly from as received bar due to the added thermal processing history. A finite element simulation of the carburization process for a C-ring coupon is presented.
CFD Investigation of Quench Media and Orientation Effects on Structural Stress Induced in the Intense Quenching Processes for Aluminum Cylinder Heads
Authors: Jan James , Nannapuraju Madhusudhan
Published: March 2024

Heat treatment is a common manufacturing process in automotive industry to produce high performance components such as cylinder heads and cylinder blocks. Although heat treatment incorporating a quenching process, either by high velocity air flow or water, can produce parts with durable mechanical properties, an unwanted effect of intense quenching processes is that they also induce thermal residual stress, which often is a leading cause for quality issues associated with high cycle fatigues. During product development cycle, it is not uncommon to switch between air and water quench media and change quench orientation in order to minimize residual stress. However, the choice of quench media and quench orientation is often determined by intuitive engineering judgement at best and trial-and-error iterative method at worst. With the advancement of CFD technologies, the temperature profile and history of quenching processes now can be accurately calculated. Since thermal residual stress is directly linked to non-uniform temperature distribution in the metal, spatial temperature gradient of each quenching process is evaluated to study and compare the performance of different quench media and configuration. The conclusion of this study can be used to establish engineering guidelines for future product development.
Advanced Nickel Alloy for High-Temperature Vacuum Baskets
Authors: Glasser Marc , Jones Roger
Published: March 2024

An advanced nickel alloy with a specially designed chemistry to provide maximum oxidation resistance at the most extreme temperatures and controlled precipates to maximize creep strength. A leading vacuum furnace supplier has selected this alloy as a suitable material for bar baskets in their most demanding application, 2300 F and pressure quenching. Baskets fabricated from all other alloys tested lasted between 5 and 10 cycles before requiring extensive, labor intensive straightening. The new alloy baskets have been used for over 30 cycles, with minimal distortion. This extended life eliminates several straightening cycles and the high labor costs associated with manual straightening and reassembly.
Corrosion Properties of Selected Coatings Produced by Atmospheric Plasma Spraying, HVOF, and Laser Remelt Methods
Authors: Nielsen P.T. , Mathiesen T. , Nielsen S.E.
Published: March 2024

This work examines the corrosion behavior of cobalt and nickel base coatings produced by APS and HVOF spraying. Laser fusing and sealing are also assessed for comparison as are the corrosion properties of tungsten carbide, chromium carbide, and chromium oxide. All coatings and processes are analyzed by cyclic polarization testing and optical and scanning electron microscopy. Test results are presented and discussed along with the relative merits of each process.
Fabrication of Wire Mesh Heat Exchangers for Waste Heat Recovery Using Wire-Arc Spraying
Authors: Rezaey R. , Salavati S. , Pershin L. , Coyle T. , Chandra S. , Mostaghimi J.
Published: March 2024

In this study, twin wire arc spraying is used to bond wire mesh to the outside surfaces of stainless steel pipes in order to increase heat transfer surface area. At the optimum spray distance, the oxide content, porosity, and adhesion strength of the coatings are shown to be 6.6%, 2.1%, and 24 MPa, respectively. Pipes with different wire mesh configurations were placed in an oven and heated to temperatures from 300 °C to 900 °C. Water temperatures were measured at the inlet and outlet of the pipe for flow rates between 0.2 and 0.5 gpm. A maximum water temperature rise of 13 °C was achieved, corresponding to a total heat flux of 57 kW/m2. Heat transfer efficiency is shown to depend strongly on the quality of the bonds between the wire mesh and pipe and the spacing of wires in the mesh.
Superhydrophobicity and Water Repelling Characteristics of Thermally Sprayed Coatings
Authors: Sharifi N. , Ben Ettouil F. , Mousavi M. , Pugh M. , Dolatabadi A. , Moreau C.
Published: March 2024

This study evaluates the wetting behavior of TiO2 coatings deposited by atmospheric and suspension plasma spraying. A design-of-experiments method is used to investigate the effect of different spray parameters on the water contact angle (WCA) of the coatings. Despite the hydrophilic nature of TiO2, coatings with WCAs as high as 140° were achieved by controlling various spray parameters. SEM imaging shows that these coatings have a cauliflower-like surface morphology that repels and sheds water.
High Temperature Oxidation Behavior of a Novel Ni-20Cr Alloy Powder Coating on T22 Steel
Authors: Kumar Manoj , Singh Harpreet , Singh Narinder
Published: March 2024

In this study, Ni-20Cr alloy powder was synthesized and deposited on T22 boiler steel by HVOF spraying. Coated and uncoated test samples were placed in a silicon carbide tube furnace and subjected to cyclic oxidation conditions in 900 °C air. Oxidation kinetics were established via weight change measurements and oxidation products were characterized based on XRD and SEM-EDS analysis. The results show that in addition to improving the oxidation resistance of the steel, the Ni-20Cr coatings also reduced spallation due to the formation of a protective Cr2O3 phase.
High-Pressure Cold-Sprayed Ni and Ni-Cu Coatings - Improved Structures and Corrosion Properties
Authors: Koivuluoto H. , Milanti A. , Vuoristo P. , Bolelli G. , Lusvarghi L.
Published: March 2024

This study examines the structural and corrosion properties of Ni and NiCu coatings produced by high-pressure cold spraying. It also assesses the effect of heat treatment. FE-SEM images of coating cross-sections show tightly bonded particles with only a minor presence of open or oxidized boundaries. Polarization measurements in alkaline salt and acid solutions show that the Ni and NiCu coatings have good potential for corrosion protection applications. Corrosion behaviors of as-sprayed and heat treated coatings are compared with corresponding properties of bulk and substrate materials.
Fundamental Cost Analysis of Cold Spray
Authors: Stier O. , Siemens AG
Published: March 2024

This report analyzes the cost structure of the cold spray process using a generic model applicable to various systems (high pressure, low pressure, kinetic) and applications (coating, restoration, additive manufacturing, near-net forming). The cost model is relatively easy to use, yet sufficiently accurate to support decisions. It is shown that high-pressure spraying is generally favorable, that He-N2 gas blends are the most economic, and that He recovery is beneficial in high-volume production, even when He-N2 blends are used. The cost model makes it possible to determine the optimal He concentration of the propellant gas for a given application as demonstrated in a case study involving bond coats for gas turbine blades.
High Temperature Oxidation Behavior of Cold Sprayed Ni-Al2O3 Composite Coating
Authors: Huang C.J. , Li W.Y. , Yu M. , Liao H.
Published: March 2024

In this study, a nickel-coated Al2O3 powder, produced by hydrothermal hydrogen reduction, is cold sprayed with the aim of increasing the volume fraction of alumina particles in the nickel matrix. Spray trials were conducted to investigate the effect of oxidation temperature on the microstructure and hardness of as-sprayed as well as heat treated Ni-Al2O3 composite coatings. Results show that oxidizing has a significant effect on microstructure and hardness and that the morphologies of oxide films differ depending on the heat treatment.
Coating Performance and Durability of Zn-Based Composite Materials Prepared by Using Low-Pressure Cold Spraying
Authors: Koivuluoto H. , Ketola J. , Milanti A. , Vuoristo P. , Descurninges L.-L. , De Dave-Fabregue N. , Jeandin M.
Published: March 2024

The aim of this work is to characterize the performance and durability of Zn-based composite coatings produced by low-pressure cold spraying and evaluate their potential for use in repair and restoration applications. Mechanically blended Zn+Al+Al2O3, Zn+Cu+Al2O3, and Zn+Ni+Al2O3 powder mixtures were deposited on grit-blasted carbon steel (Fe52), copper, aluminum, and nodular cast iron substrates using optimized feed rates. In addition, round samples were drilled and the holes were repaired by handheld spraying. Coated substrates are assessed based on microstructural analysis, laser shock adhesion testing (LASAT), and thickness and hardness measurements. Hole repairs are evaluated based on bond strength and gas permeability measurements. The procedures are described and the finding are presented and discussed.
Dense and High Purity Yttria Coatings by APS with a New Yttria Powder
Authors: Allimant A. , Billières D. , Wallar H.
Published: March 2024

This study compares the morphology, porosity, and purity of yttria powders produced by spray drying, spray drying and sintering (SDS), and spray drying and plasma fusion (SDPF). The surface morphology of each type of powder is examined by SEM. Pore volume and density are determined by Hg porosimetry, and impurity concentrations are assessed via glow discharge mass spectrometry (GDMS). Coatings made from the powders by means of air plasma spraying are evaluated based on porosity, spray time, powder consumption, and embedded fine particles.
Nucleation and Growth Transformations in Vacuum Plasma Sprayed Ti-6Al-4V Alloy
Authors: Salimijazi H.R. , Mousavi Z.A. , Golozar M.A. , Mostaghimi J. , Coyle T.
Published: March 2024

This study investigates isothermal transformation kinetics in Ti-6Al-4V alloys structures produced by vacuum plasma spray forming. As-sprayed samples were homogenized in the β phase followed by fast cooling to the two-phase temperature region, then quenching to suppress further transformation. The microstructure of heat-treated specimens was examined by optical microscopy and equilibrium phases were measured using image analysis. The kinetics of the β → α+β phase transformation are revealed by plotting the amount of α-phase obtained over a 10 to 60 s interval at isothermal temperatures of 800, 850, 900, and 950 °C. Corresponding phase transformation rates are also calculated based on Johnson-Mehl-Avrami (JMA) theory. At temperatures below 900 °C, the main phase transformation mechanism is homogeneous nucleation and growth of α-phase. At higher temperatures, phase transformations are driven by two mechanisms: the formation of α-phase in grain boundaries and α-plate nucleation and growth.
The Effect of CFRP Surface Treatment on the Splat Morphology and Coating Adhesion Strength
Authors: Ganesan Amirthan , Shahien Mohammed , Yamada Motohiro , Fukumoto Masahiro
Published: March 2024

Cold spraying is a promising candidate for the metallization of carbon fiber reinforced polymer (CFRP) composites, but it requires the use of a protective interlayer deposited by either flame or plasma spray. This study evaluates the effect of different surface treatments on interlayer adhesion strength. CFRP samples were treated mechanically, chemically, and thermally and then a copper layer was deposited by atmospheric plasma spraying. Adhesion strength was measured by pullout testing and the results are compared with surface roughness measurements, SEM fracture surface images, FIB bisections of single Cu splats, and XPS analysis of the chemical affinity between the polymer and copper.
Impact of Impurity Content on the Sintering Resistance of Dysprosia and Yttria Stabilized Zirconia Thermal Barrier Coatings
Authors: Curry N. , Janikowski Wyszomir , Markocsan N.
Published: March 2024

Dysprosia stabilized zirconia (DySZ) is a promising candidate to replace yttria stabilized zirconia (YSZ) as a thermal barrier coating due to its lower inherent thermal conductivity. It is also suggested in studies that DySZ may show greater stability to high temperature phase changes compared to YSZ, possibly allowing for coatings with extended lifetimes. Separately, the impurity content of YSZ powders has been shown to influence high-temperature sintering behavior. By lowering the impurity oxides within the spray powder, a coating more resistant to sintering can be produced. This study evaluates high purity and standard purity dysprosia and yttria stabilized zirconia coatings and their performance after extended heat treatment. Coatings were produced using powders with the same morphology and grain size; only the dopant and impurity content were varied. Samples were heat treated for up to 400 hours at 1150 °C and thermal conductivity measurements were plotted to show the evolution of thermal properties with respect to time. Thermal conductivity is compared to coating microstructure and porosity in order to track structural changes due to sintering.
Effect of Plasma Spray Parameters on Thermal Barrier Coating Formation and Microstructural Properties
Authors: Sesso M.L. , Berndt C.C. , Wong Y.C.
Published: March 2024

This study investigates the effects of plasma spray parameters on the microstructure and porosity of yttria-stabilized zirconia coatings. In the experiments, the torch was held in place perpendicular to the substrate to produce cone or stalagmite shaped deposits. Stand-off distance (80, 90, 120 mm) and spray time (15, 30, 60 s) were varied to assess their effect on microstructure-property relationships as well as particle temperature, velocity, and impact angle. The shapes of the deposits were recorded using a CMM and surface topography and roughness were measured with a 3D optical profiler.
Effect of Feedstock Characteristics and Operating Parameters on the Properties of Cr2O3 Coatings Prepared by Suspension-HVOF Spraying
Authors: Toma Filofteia-Laura , Scheitz Stefan , Trache Richard , Langner Stefan , Leyens Christoph , Potthoff Annegret , Oelschlägel Kathrin
Published: March 2024

Chromium (III)-oxide (Cr2O3) is a widely used coating material for applications in the printing, paper and textile industry, pumps and mechanical sealing systems. Cr2O3 coatings offer high hardness, excellent sliding wear performance and corrosion resistance. Suspension-HVOF process (S-HVOF) allows the production of dense, finely structured coatings with smooth surfaces and improved mechanical properties. The current work presents a study on the development of ready-to-spray aqueous Cr2O3 suspensions starting from different commercial available powders and the effect of suspension characteristics (particle size distribution, viscosity, stability) and operating parameters (gas composition, spray distance) on the microstructure, microhardness and deposition efficiency of the S-HVOF Cr2O3 coatings. By appropriate choice of the suspension and spraying parameters, thick (> 100 μm) and mechanical stable (microhardness higher than 1500 HV0.3) suspension sprayed Cr2O3 coatings were produced.
INSTITUTIONAL MECHANISMS FOR ENSURING THE SUSTAINABILITY OF THE FUNCTIONING OF THE UKRAINIAN MARKET OF POULTRY MEAT AND EGGS IN THE ASPECTS OF FOOD SECURITY IN THE POST-WAR PERIOD
Authors: ANTONYUK P.O. , KRAMSKYI S.O.
Published: March 2024

Topicality. In the conditions of martial law and the future post-war reconstruction, it is appropriate to consider the national economy in the framework of ensuring the stability of the market of poultry meat and eggs and food security in the post-war period. The functioning of Ukraine's food security and the determination of strategic priorities for the development of the poultry meat and egg market are now gaining fundamentally new relevance.Aim and tasks. The aim is to analyze the state and development of the stability of the Ukrainian market of poultry meat and eggs, egg products, and to develop practical recommendations for the reproductive development of this market in the post-war period.

Research materials and methods. The author's research on the use of institutional mechanisms of selective markets, regarding the solution of food security problems and the theory of management of complex economic systems: system analysis, statistical analysis, economic analysis, in particular, for the study of selective sectors of commodity markets on the example of the market of poultry meat and eggs.

Research results. The authors investigated the restoration of the process of extended sustainable reproduction of the production of food products in the market segment of poultry meat and eggs. The authors conducted a statistical analysis of the dynamics of the poultry population by categories of farms, enterprises, and households over 30 years in Ukraine, and conducted an analysis of the price index in the retail network of stores by egg brands. According to the authors of the study, the specified areas of legislative development of the market and the mechanisms of their practical implementation are the institutional mechanisms and proposals for improving regulations in accordance with the standards of the EU countries, regarding the requirements and rules for the development of the poultry meat and eggs market, they should effectively influence sustainable development of the production of products of this market.Conclusions. State institutions and local authorities should effectively promote the development of poultry and egg producers and adapt the business to new post-war economic realities and challenges. To ensure the functioning of the EU rules and requirements for the products of the poultry meat and egg market during the war period against the background of food security. Proposals: restoration of the leading positions of poultry meat and egg producers in the domestic domestic market; implement programs to restore and stabilize the functioning of regional poultry and egg markets; promote the involvement of international charitable funds and organizations for the sustainable production of poultry meat and eggs.
The use of Thermography to Determine the Boundary Conditions of Heat Exchange on The Inner Surfaces of Translucent Enclosing Structures
Authors: KONSTANTINOV А.P. , AKSENOV I.S. , ELOHOV A.E.
Published: March 2024

The paper presents an approach to determining the boundary conditions of heat transfer (heat transfer coefficients) on the inner surfaces of translucent enclosing structures using thermal imaging data. To implement this approach, it is necessary to use additional equipment in the form of sheets of paper. A sheet of paper is installed close to and perpendicular to the investigated surface of the structure. At the same time, the profile of the sheet of paper exactly repeats the geometry of the surface under study. Based on the results of thermal imaging, thermograms and temperature graphs are constructed on characteristic areas of the inner surface of the translucent enclosing structure. They are used to determine the thickness of the boundary layer of air adjacent to the inner surface of the translucent enclosing structure. These data are used later to calculate the heat transfer coefficient at the inner surface of these structures. The presented approach was implemented in the course of field studies of heat transfer conditions at the internal surfaces of four PVC windows.
Experimental Study of Longitudinal and Transverse Bending of Pipe Concrete Rods
Authors: KHAZOV P.A. , POMAZOV A.P.
Published: March 2024

The results of experimental studies of pipe-concrete rods during longitudinal and transverse bending tests, since these stress-strain states are of interest from the point of view of the operation of building structures, are presented. To carry out the experiments, several series of laboratory samples 700 mm long were made, which were steel pipes with a monolithic core made of fine-grained concrete. Diagrams of test installations are presented and methods for conducting experiments on axial compression with subsequent loss of stability and three-point bending with concentrated lateral load are described. Based on experimental data, deformation diagrams are constructed and compared with the deformation of a hollow steel pipe. It is noted that the presence of a concrete rod prevents premature loss of stability of the pipe wall during longitudinal bending, limits local deformations due to the curvature of sections during transverse bending, increases the elastic region of deformations, and also prevents the brittle nature of destruction, which is an important advantage in the design of buildings.
Ungrateful Girl Refugees in Lore Segal's Other People's Houses and Vesna Maric's Bluebird
Authors: Mclaughlin Carly
Published: March 2024

Against the background of recent extraordinary narratives of displaced girls, I consider two accounts of refugee girls in Britain at earlier historical moments: Lore Segal's Other People's Houses ([1964] 2018) about her memories of being a Kindertransportee in the late 1930s, and Vesna Maric's Bluebird (2009), a memoir of her journey into refugeehood as a teenage girl following the outbreak of the war in Bosnia in the early 1990s. I read their framing of the refugee experience as interventions into hegemonic scripts of displaced girlhood that ultimately destabilize the wider stories of nationhood that such narratives often uphold. Read through the frames of girlhood and refugeetude, these narratives point to alternative modes of imagining refugee girls and their position in and beyond the nation.
Paperwork Selves and Arab Refugee Girls’ Experiences of Resettlement in Tennessee
Authors: Leggett Ida Fadzillah
Published: March 2024

For refugees, the experience of displacement does not always end with resettlement. Multidisciplinary research with educators and refugee students at a Tennessee high school demonstrates how some school personnel prioritized the alienating concept of so-called paperwork selves when talking about their refugee students, highlighting exotic stereotypes of innocence, ignorance, and a lack of educational history. I focus here on educators’ perceptions of Arabic-speaking refugee girl students, and contrast these with the girls’ own words about their experiences and self-understanding. The girls’ narratives demonstrate their keen sense of identity as young women connected to real places, remembered histories, and imaginaries of a future as transnational young women with global possibilities.
For Me, A Border
Authors: Hunt Lucy , Amiri Parwana
Published: March 2024

For me, a border is not passing

It is not to pass from one country

If you are not allowed

to take part in life.

     – Parwana Amiri
Evaluation of Endothelin-1–Induced Pulmonary Vasoconstriction Following Myocardial Infarction
Authors: Sauvageau Stéphanie , Thorin Eric , Caron Alexandre , Dupuis Jocelyn
Published: March 2024

Endothelin (ET) levels are elevated in congestive heart failure secondary to myocardial infarction (MI) and correlate well with the severity of pulmonary hypertension (PH), suggesting that the ET peptide could contribute to the pathophysiology of venous PH. Alterations of pulmonary vasoreactivity to ET after MI and the respective roles of the ETA and ETB receptors (ETA-R and ETB-R) have never been evaluated, to our knowledge. MI was induced in rats. Three weeks later, small pulmonary resistance arteries were mounted on a microvascular myograph. Cumulative concentration-response curves to ET-1 and sarafo-toxin 6c (S6c) were performed. Response to ET was also assessed in the presence of ET-R antagonists. Heterodimeriza-tion of receptors was evaluated by immunoprecipitation of the ETB-R, followed by western blotting for the expression of the ETA-R. Maximal vasoconstriction and sensitivity to ET-1 were similar in sham and MI with values of 88 ± 3.9% and 80 ± 3.8%, respectively. The response to S6c was similarly less in both sham (67 ± 5.7%) and MI groups (60 ± 6.6%). When administered alone, the ETA-R antagonist (10 n M A-147627.1) and the ETB-R antagonist (1 μ M A-192621.1) had no significant effect. However, their combination markedly reduced vaso-constriction (52 ± 5.3%; P < 0.001). The endothelial and medial distribution of ET-Rs was similar in sham and MI groups. In vitro studies demonstrated co-immunoprecipitation of the ETA-R and ETB-R. Vasoconstriction of isolated resistance pulmonary arteries to ET agonists is not altered after MI. Dual antagonism results in optimal blockade of vasoconstriction, possibly because the ETA-R and ETB-R can form functional heterodimers.