bluuebunny/crossref_metadata_2025_split huggingface dataset:
Damage Mechanism of Functionally Graded Thermal Barrier Coatings in Thermal Cycling
Authors: Ohki M. , Mutoh Y. , Takahashi M. , Ishibashi T. 
Published: October 2022

Abstract
This paper presents the results of long-term thermal cycling tests on plasma-sprayed thermal barrier coatings, including coating samples produced with functionally graded materials. The role of oxidation is also considered based on the results of elemental analysis. The authors explain how the coatings were produced and tested and present and analyze the test results. The thermal barrier coatings formed with functionally graded materials were found to be relatively unaffected after the long-term thermal cycling test and showed no signs of oxidation. Paper includes a German-language abstract.
Marine Corrosion Performance of HVOF Sprayed Alloy Coatings: Comparison of Field Exposure Test and Laboratory Test
Authors: Kuroda S. , Fukushima T. , Kawakita J. , Kodama T. 
Published: October 2022

Abstract
This study examines stainless steel and Hastelloy C coatings sprayed using commercial HVOF equipment. Porosity and oxygen content have been measured under various spray conditions and laboratory corrosion tests have been carried out using electrochemical techniques. The report first summarizes major results obtained in the laboratory evaluation, then presents the results of marine exposure testing for up to six months. It concludes with detailed comparisons between the two. Paper includes a German-language abstract.
Effect of Substrate Temperature and Roughness on Coating Formation
Authors: Mehdizadeh N.Z. , Chandra S. , Mostaghimi J. 
Published: October 2022

Abstract
Though a large literature exists on thermal spray coating, there have been few attempts to directly observe molten droplets as they land on a substrate, freeze, and coalesce into a solid layer. In this study, investigators photograph the impact of tin droplets landing on stainless steel surfaces at high speeds. They also measure the effect of substrate temperature and surface roughness on deposition efficiency, the fraction of coating material that adheres to the surface. The paper describes the apparatus used to create the tin droplets and record their impact with the target. It also provides a detailed review of the test results and discusses the practical implications of the study. Paper includes a German-language abstract.
Microstructure of FeAl Binary Alloy Coatings from Detonation Gun Spraying
Authors: Xin G. , Gao Y. , Yan Y.G. 
Published: October 2022

Abstract
In this investigation, binary FeAl layers are produced by detonation spraying and examined by means of microscopy and X-ray diffractometry. The examinations show that the layers have a lamellar structure consisting of FeAl and Fe4Al13 phases with a small amount of alumina. It is observed that with increasing amounts of fuel gas and decreasing detonation frequency, the proportion of FeAl phases decreases and variations in microhardness throughout the coating become irregular. Paper includes a German-language abstract.
Relationship Between Splat Morphology and Cohesion-Adhesion Strength of Coatings
Authors: Oki S. 
Published: October 2022

Abstract
This study investigates the relationship between splat morphology and adhesion strength in plasma sprayed coatings. The shape and size of the splats are examined and found to differ, in some cases significantly, depending on whether the splats are in the center or on the periphery of the spray pattern. Splats in the center of the pattern are formed by particles with higher temperature and velocity than those on the periphery and they tend to produce higher quality layers. In an experiment in which alumina layers are sprayed through a graphite slit filter, coating adhesion is shown to be superior, as expected. Paper includes a German-language abstract.
Tribological Properties of Carbide Coatings by Plasma and HVOF Spraying
Authors: Żórawski W. 
Published: October 2022

Abstract
This paper assesses the abrasion resistance of plasma and HVOF sprayed WC-Co and Cr3C2 coatings under dry friction conditions. It is observed that WC-Co layers produced by HVOF spraying have the most regular layer structure, the best abrasion resistance, and the highest hardness. Paper includes a German-language abstract.
Drawbacks in Corrosion Resistance of Thermal Spray Coatings in Aggressive Aqueous Media
Authors: Guilemany J.M. , Fernández J. , Delgado J. , Benedetti A.V. 
Published: October 2022

Abstract
The growing use of thermal spray technology in manufacturing is increasing the need for knowledge regarding the behavior of thermal spray coatings in aggressive environments. Due to the different characteristics of the spraying processes and materials used, the mechanisms of attack can vary greatly from layer to layer depending on the application. This paper presents a detailed investigation of corrosion mechanisms at room temperature and their effect on a wide range of thermally sprayed metals and ceramic-metal (cermet) composites. Paper includes a German-language abstract.
Structure and Tribological Characteristics of HVOF Coatings Sprayed from Powder Blends of Cr3C2-25NiCr and Metallic Alloys
Authors: Määttä A. , Männikkö U. , Vuoristo P. , Mäntylä T. , Laitinen K. 
Published: October 2022

Abstract
In this study, Cr3C2+25NiCr hardmetal powder is mixed with small amounts of NiCr and CoCr powder and sprayed on steel substrates with a high-velocity oxyfuel torch. High-temperature friction tests are used to assess tribological performance and investigate the formation of tribolayers. The results of the study show that the friction coefficient of HVOF sprayed hardmetal coatings can be reduced by adding small amounts of low-friction powder to the feed stocks prior to spraying. The reduction in friction is the result of a tribochemical reaction that occurs on friction surfaces under contact conditions involving high temperature, pressure, and sliding speed. Paper includes a German-language abstract.
Wear Behavior of Hot Isostatically Pressed Thermal Spray Coatings
Authors: Stoica V. , Ahmed R. , Tobe S. 
Published: October 2022

Abstract
Hot isostatic pressing has been shown to be an effective post treatment for thermal spray coatings, improving hardness, density, and microstructure as well as metallurgical bonding between splats. In this study, the sliding wear resistance of as-sprayed and post-treated WC-Co deposited by HVOF is evaluated by means of ball-on-disk testing and the effects of HIPing are assessed based on SEM and XRD analysis, hardness measurements, and fracture toughness tests. Changes observed in the WC-Co layers, including the precipitation of carbides and the elimination of secondary phase W2C, are also discussed. Paper includes a German-language abstract.
3D Modeling of Substrate Temperature During Layer Build-up
Authors: Bolot R. , Imbert M. , Coddet C. 
Published: October 2022

Abstract
The modeling work presented in this paper is intended to simulate a plasma jet impinging on a flat surface and its influence on substrate temperature during layer build-up. In the first step, a two-layer model is incorporated into a commercial CFD code to express the turbulent plasma jet and the viscous sublayer that forms on the surface of the impact plane, or in this case, the substrate. In a subsequent step, heat dissipation in the substrate is expressed with a 3D volume model based on finite volume approximation of thermal exchanges. This two-step approach allows surface temperatures on the substrate to be determined as the plasma-sprayed layer grows. The influence of different substrate materials is also considered in this investigation, particularly in regard to transient surface temperatures. Paper includes a German-language abstract.
Plasma-Pulver-Auftragschweißen von Messern für die Lebensmittelindustrie (PTA Powder Cladding of Knives for Food Processing Industry)
Authors: Gebert A. , Heinze H. 
Published: October 2022

Abstract
The processing of frozen foods places high demands on the strength and edge retention of knives, which are typically made of chromium steels due to their corrosion resistance. In meat processing, in addition to cutting, the knives also assume a transport function, where enormous bending forces can occur. A trade-off between strength and ductility is thus required when choosing a material and heat treatment. This paper describes the implementation of a path-controlled build-up welding system for complicated flat contours and the special properties of a newly developed corrosion-resistant powder optimized for knife edges. Field tests indicate that, with the plasma transferred arc welding process and new powders, service life can be extended by a factor of five. Paper text in German.
Investigation of Composite Powders with Hard Lubricant Components for Thermal Spraying of Coatings
Authors: Ilyuschenko A. , Shevtsov A. , Azarova T. , Okovity V. , Smurov V. , Ignatiev M. , Kovalion E. 
Published: October 2022

Abstract
This paper presents the results of studies on powders used in wear-resistant thermal spray coatings. The work focuses on the influence of the shape, size, and structure of composite powders containing nickel, iron, and chromium mixed with TiC and dry lubricants such as MoS2 and CaF2. The powders are analyzed using SEM and metallographic methods along with X-ray diffraction. Paper includes a German-language abstract.
Performance of HVOF Nanostructured Titanium Diboride Composite Coatings
Authors: Wilden J. , Schnick T. , Wank A. , Schreiber F. 
Published: October 2022

Abstract
This study assesses the wear performance of HVOF-sprayed nanostructured TiB2 composite coatings and the use of mechanical alloying for powder preparation. In order to prevent the formation of undesired secondary borides, TiB2 particles are processed with a nickel-base self-fluxing matrix alloy. XRD analysis shows that the minimum average TiB2 crystal size is 22 nm after high-energy milling and only slightly larger and uniformly distributed after HVOF spraying. The resulting TiB2 layers are characterized based on morphology and wear behavior and are shown to hold promise for abrasive wear applications. Paper includes a German-language abstract.
Pengembangan Media Pembelajaran Macromedia Flash Berbasis Saintifik
Authors: Ependi Agustan , Purwasi Lucy Asri , Adha Idul 
Published: October 2022

This study aims to develop scientific-based macromedia flash learning media on integer material for seventh grade junior high school students and determine the quality of learning media developed based on validity and practicality. This research is a development study using the ADDIE development model. The stages of the ADDIE development model consist of 5 stages, namely: Analysis, Design, Development, Implementation, Evaluation. The results of the study, from the results of the assessment analysis by the three experts namely: linguists, material experts, and media experts, the learning media developed met very valid criteria with an average score of 4.24. The results of the analysis of the practicality of the user questionnaire (teachers and students) met very practical criteria with an average score of 4.37. The characteristics of the developed media are 1) The material is in accordance with the competency to be achieved; 2) The learning objectives are clear; 3) There are clear instructions; 4) Language that is easily understood by students; 5) In accordance with the approach used is a scientific approach; 6) There is a section to motivate students; 7) Clear learning flow; 8) There are practice questions and discussion as well as evaluation questions; 9) Interactive; 10) Easy navigation; 11) Images, animations, text, and colors are presented in harmony and harmony. In conclusion, the development of scientific-based macromedia flash learning media meets valid and practical criteria for use by VII grade junior high school students in learning integer material.
Keywords: Integer, Macromedia Flash, Scientific, Development of Learning
Media
Pengembangan Perangkat Pembelajaran Berdasarkan Problem Based Learning terhadap Peningkatan Kemampuan Pemahaman Konsep Siswa
Authors: Sinaga Wita , Purba Tuty Novelinda , Telaumbanua Folala , Simanjuntak Ruthmayasari 
Published: October 2022

This study aims to develop learning tools in the form of lesson plans and worksheets based on Problem Based Learning mathematics on comparative material for seventh grade junior high school students oriented to the ability to understand concepts. The quality of the developed products is assessed based on aspects of validity, practicality, and effectiveness. The learning device development procedure refers to the 4-D development model, namely Define, Design, Develop, and Disseminate. Due to the limitations of the researcher, the research was carried out until the develop stage. The subjects of this study were students of class VII ASMP Negeri 2 Dolok Pardamean, totaling 34 people. The results of the research, namely: 1) the resulting learning tools, in the form of: lesson plans, student activity sheets and concept understanding tests have met the criteria; 2) the effectiveness of learning tools is concluded based on the percentage of students who understand the concept of at least moderate is 85.29% of the 34 students who take the test and the achievement of the ideal percentage of time for each category of student and teacher activity. In conclusion, the development of learning tools in the form of lesson plans and worksheets based on Problem Based Learning on comparative materials for grade VII junior high school students proved to be effective and able to improve students' conceptual understanding.
Keywords: Ability to understand concepts, Learning tools, Problem Based Learning
Pengaruh Strategi React dengan Media Pembelajaran Berbasis Prezi terhadap Kemampuan Komunikasi Matematis
Authors: Vanka Fany Aviola , Kurniasih Meyta Dwi 
Published: October 2022

This study aims to determine whether or not there is an effect of using the REACT strategy with Prezi-based learning media on mathematical communication skills. This type of research is quantitative using a quasi-experimental research method. The population in this study were all seventh grade students at SMP Negeri 194 Jakarta for the 2020/2021 academic year. The sample used was 66 students from class 2 class. Sampling using simple random sampling technique. The research instrument is in the form of a description question. The results of the normality test showed that the experimental class data were normally distributed and the control class data were not normally distributed. Hypothesis testing using a non-parametric test, namely the Mann Whitney test with a significant level of 5%, the value z_table=z_0.5(1-0.05) =z_0.475=1.96; because the value of z_count = 5.40. So that in determining the test criteria, the acceptance of Ha is: z_hitung>z_table. The results of this study can be concluded that there is an effect of REACT strategy with Prezi-based learning media on students' mathematical communication skills.
Keywords: REACT Strategy, Prezi Learning Media, Students’ Mathematical Communication
Efektivitas Pembelajaran Kontekstual dalam Meningkatkan Kemampuan Siswa Menyelesaikan Soal Matematika Berbasis HOTS (Higher Order Thinking Skill)
Authors: Supratman Moh 
Published: October 2022

This study aims to determine the effectiveness of contextual learning in improving students' ability to solve math problems based on HOTs (Higher Order Tinking Skill). This type of research is experimental research, the research design uses a one group pretest-posttest design. The research subjects were students of class VIIA SMP Negeri 2 Praya Timur, totaling 42 students. The data collection instrument used a written test in the form of an essay (essay), and data analysis used the t test. Based on the results of descriptive statistical analysis, it shows that the pretest results of students in solving HOTs-based questions are still low with an average of 31.07, and after being given treatment by applying a contextual learning approach, students' ability to solve HOTs-based questions based on the posttest average increased to 84 .57 with very high category. While the results of the t-test with a test-value of 65 obtained tcount = 15.515, for a significance value of 0.000. In conclusion, the contextual learning approach is effective in improving students' ability to solve HOTs-based questions.
Keywords: Contextual Learning, HOTS-Based Questions
Tricuspid regurgitation and left ventricular eccentricity as a measure of heart failure in the newborn patient with a vein of Galen malformation: illustrative case
Authors: Yarden Jeremy A. , Hauck Lily I. , Athavale Kamlesh V. , McCrary Andrew W. , Campbell M. Jay , Hauck Erik F. 
Published: October 2022

BACKGROUND
Successful management of a vein of Galen malformation (VoGM) in the newborn patient requires a highly coordinated team approach involving neonatologists, pediatric cardiologists, pediatric neurologists, neurosurgeons, and interventionalists. Indication and timing of catheter intervention are topics of ongoing debate.

OBSERVATIONS
The authors highlighted two key echocardiographic markers believed to be practical indicators regarding the need for urgent catheter embolization in neonates with a VoGM. The first and preferred parameter was the tricuspid valve regurgitation (TR) gradient, an estimate of pulmonary artery hypertension. If the TR gradient exceeds systolic blood pressure (suprasystemic pulmonary hypertension [PH], i.e., >60 mm Hg), urgent intervention should be considered in eligible newborns. The second parameter was the left ventricular end-systolic eccentricity index (EI), a newly emerging echocardiographic marker and indirect correlate of PH. As an alternative to the TR gradient, an increased eccentricity index (>1.6) suggests severe right heart compromise, requiring emergency catheter embolization of the malformation. Postoperatively, the progressive reduction of both the TR gradient and the EI correlated with recovery.

LESSONS
In eligible newborns, urgent embolization of a VoGM is recommended in the presence of suprasystemic TR gradients and/or increased EI >1.6.
Six Months of Remote Patient Monitoring is Associated with Blood Pressure Reduction in Hypertensive Patients: An Uncontrolled, Observational Study
Authors: Frazier William , Beins Michael , DaVanzo Joan , Seibels Emmet , Heath Steven , Dobson Allen 
Published: October 2022

_BACKGROUND: _Remote Physiologic Monitoring (RPM) is a form of telehealth that measures vital signs at home and automatically reports the results to providers, thereby possibly improving chronic disease management. Medicare payment for RPM began in 2019. Two potential obstacles to RPM growth are the paucity of published clinical outcomes data and the Medicare requirement that monitoring be done at least 16 days/month to bill for the service. To help address these issues, we report the following uncontrolled, observational study.

_METHODS:_ 1,102 consecutive patients enrolled in RPM were divided into 4 groups based on initial average mean arterial pressure (MAP) and into 6 groups based on number of days/month MAP was measured. We report changes in MAP after 6 months of RPM as a function of initial MAP and number of days/month MAP was monitored.

_RESULTS:_ After 6 months of RPM, average MAP dropped from 97 to 93 (p< .01). This drop was greatest in the 50% of patients initially hypertensive. These patients saw average MAP reductions from 106 to 97 (p< .001) and became normotensive. While MAP reduction was greatest the more frequently patients measured, significant reduction occurred in the hypertensive patients whether they measured more or less than 16 days/month (p<.001). No minimum threshold of measurements was found that predicted failure of RPM to lower MAP.

_CONCLUSIONS:_ RPM is associated with clinically and statistically significant reductions in average MAP in patients who were initially hypertensive. This benefit occurred irrespective of the number of days/month patients measured MAP.
ROLE AND PLACE OF WORK IN EVERYDAY OF THE POPULATION OF KABARDINO-BALKARIA IN THE CONDITIONS OF WAR
Authors: Tetuev Alim I. 
Published: October 2022

In the article, based on the analysis of historiography on the topic, the problems that need to be studied are identified, as well as the goals, objectives, research methodology. The experience of the work of state and party bodies of Kabardino-Balkaria in organizing the labor activity of workers, collective farmers and employees in the conditions of the approaching front, temporary occupation and the period of restoration of the national economy after the expulsion of the enemy from the territory of the republic is summarized. The number of workers and employees is analyzed, including by age and gender in various sectors of the national economy of Kabardino-Balkaria, as well as the reasons for the shortage of labor resources in the region during the war years.The activity of industrial enterprises of the region for the production of products for peaceful and military purposes is revealed. The forms of remuneration and taxation of workers and employees are investigated. It is noted that the mandatory non-refundable cash contributions to the Defense Fund and the increase in market prices on collective farm markets led to the fact that the wages of workers and employees in the republic did not increase by the end of the war, but, on the contrary, decreased. The degree of participation of the population of the republic in the construction of defensive structures, the collection of warm clothes and gifts for the soldiers of the Red Army, the creation of the grain fund of the Red Army and the Defense Fund, and the subscription to State loans is revealed. Methods and techniques for the implementation of labor mobilization of the civilian population in agricultural production in the conditions of approaching the front are considered. The production activity of collective farmers is studied under the conditions of a new form of wages and an increase in the mandatory minimum of workdays. The reasons for the low labor activity of a part of the rural population in the region are determined. The results of labor and economic mobilization of the population of the republic are summarized.