bluuebunny/crossref_metadata_2025 huggingface dataset:
Utilization of Maternal Health Care Services in Province 2, Nepal
Authors: Bista Sarita
Published: October 2022

This study aims at assessing the utilization of maternal health care service in province 2. Maternal health still remains a public health problem in province 2 though it has been improving in the last decade since the number of women seeking antenatal care has increased. This study helps to analyze the pregnancy risk can be identified, control, managed and contributes to reducing factor the maternal mortality. This study is based on data of Nepal Demographic and Health Survey 2016. The sample size consists of 571 currently married women, age groups 15-49 who had a live birth in the 5 years preceding the survey. This study showed that dependent variables means women who had attend ANC as 4 or more visits and the women who had attended ANC as less than 4 times visits. In this study the utilization of maternal health care based on factors like women’s age, level of education, poor wealth quintile are responsible. In province 2, fewer women are using ANC services. In order to address the existing gap and variation in ANC service utilization, particular attention should be given to women from less education, poor wealthquintile, utilization of services among older age group. In province 2, ANC visit and 4 times is highest of age group 35-49 (44%) followed by 25-34 age group (31%) and least of age group 15- 24 (29%) mothers are using ANC services. While talking about education level, near about one third percent (32%) of respondents do not have any formal education. These factors still make problem to mothers using of ANC services .Special emphasis on women’s education plays a vital role to increase the utilization of maternal health care. This study put forward the need for efforts from government and other agencies should implement the proper policies and programs to bring an improvement in the use of maternal health care services in Nepal.
Analisis Penilaian Materialitas pada Laporan Keberlanjutan Industri Dasar dan Kimia Tahun 2020
Authors: Ningsih Rahayu , Meiden Carmel
Published: October 2022

Penelitian ini bertujuan untuk menggambarkan informasi yang bersifat materialitas dalam pelaporan di Indonesia, khususnya informasi materialitas pada industri dasar dan kimia di Indonesia. Pengungkapan informasi yang materialitas sangat membantu pemangku kepentingan dalam proses pengambilan keputusan. Keterlibatan pemangku kepentingan yang sistematis, akan memperoleh pembelajaran untuk organisasi dan akuntabilitas yang tinggi, sehingga memperkuat kepercayaan antara organisasi dan para pemangku kepentingan. Hal tersebut akan meyakinkan laporan. Metode penelitian menggunakan pendekatan pendekatan dengan desain studi kasus. Hasil penelitian menunjukkan pendefinisian materialitas pada laporan yang dihasilkan oleh 14 perusahaan, terdapat 3 perusahaan yang tidak mengungkapkan definisi materialitas dalam laporannya. Pemangku kepentingan yang berbeda terlibat dalam proses penilaian materialitas. Dari berbagai proses tidak semua perusahaan melibatkan keterlibatan para pemangku kepentingannya pada hal-hal materialitas. Tahap pelibatan pemangku kepentingan yang paling banyak diterapkan yaitu mengetahui materi topik dan proses kedatangan topik/prioritas topik. Perusahaan telah menyajikan berbagai masalah sebagai topik materi dalam analisis materialitas. sebagian besar perusahaan telah mengelompokkan isu-isu yang diidentifikasi di bawah tema yang berbeda seperti sosial, lingkungan, ekonomi. Terdapat 6 dari 14 perusahaan yang menyampaikan materi yang utama dengan membagi pada tingkat materialitas yaitu “Tinggi”, “Sedang”, “Rendah”.
Perbandingan Faktor-Faktor yang Mempengaruhi Pertumbuhan Ekonomi dalam Konteks Negara Indonesia Dan Italia
Authors: Christian Natalis , Angelica Serly , Tanwijaya Rachel
Published: October 2022

Penelitian ini bertujuan untuk mengetahui apakah terdapatnya perbedaan faktor-faktor yang mempengaruhi pertumbuhan ekonomi pada salah satu negara di Eropa dan di Asia. Penelitian ini akan mengambil negara Indonesia dan Italia sebagai sampel penelitian. Faktor-faktor yang digunakan dalam penelitian ini terbagi menjadi 3 segi, yaitu sosial dan kependudukan, ekonomi dan perdagangan, dan pemerintahan dan politik. Sumber penelitian ini diambil dari situs resmi pemerintahan masing-masing negara, situs organisasi internasional, dan juga jurnal serta berita yang terpercaya. Hasil dari penelitian ini membuktikan bahwa Indonesia dan Italia memiliki potensi perekonomian yang berbeda tetapi sama-sama kuat untuk meningkatkan perekonomian negaranya. Peneliti berharap bahwa adanya perluasan pangsa pasar masing-masing negara dalam mendukung perekonomian negara tersebut.
Composite Functional Thermal Sprayed Coatings for Parabolic Antennas
Authors: Borisov Y. , Korzhyk V. , Kozjakov I. , Sviridova I. , Murashov A. , Borisova A. , Chub V. , Datzenko N.
Published: October 2022

This paper describes the development and evaluation of multifunctional coatings for outdoor parabolic antennas. The plasma-sprayed composite coatings provide corrosion protection, reduce solar heating, and improve the absorption of EM radiation at the edges of the antenna while impeding its flow in other areas. The coatings also reduce the impact of the support structure on antenna performance. Paper includes a German-language abstract.
Thermal Sprayed Coatings for Thixoforming Tools
Authors: Abdel-Samad A. , Rassoul S.A. , Fischer A. , Hornig T. , Lugscheider E.
Published: October 2022

The aim of this study is to investigate the development of thermally sprayed coatings for thixoforming dies and assess the effects of hot isostatic pressing on plasma sprayed coatings applied to TZM, stainless steel, and hot work steel substrates. As-deposited and compacted layers are analyzed with regard to their suitability for thermal, mechanical, and chemical protection. Paper includes a German-language abstract.
Influence of Additives on the Photocatalytic Properties of Plasma Sprayed TiO2 Coatings
Authors: Ohmori A. , Ye F.-X. , Li C.-J.
Published: October 2022

Titanium dioxide has promising photocatalytic properties that can be used in the treatment and purification of air and water. The aim of this study is to determine how process parameters and oxides added to generate anastasis affect the microstructure and surface properties of plasma sprayed TiO2. The photocatalytic effect of the layers and the influence of microstructure are investigated with the help of acetaldehyde degradation. The results show that the layers produced consist of anatase (3-15%) and rutile components. It has been proven that TiO2 is capable of decomposing acetaldehyde under UV radiation in proportion to the amount of anatase present. Paper includes a German-language abstract.
Extension of Service Life of Gas Turbine Blade by Ternary TBC Coating
Authors: Makida Y. , Tobe S. , Ando M. , Sonoya K. , Wakabayashi T.
Published: October 2022

Turbine entrance temperatures in the latest high-efficiency jet engines rise to more than 1773 K, which significantly raises the bar for thermal barrier coatings (TBCs). This paper describes a ternary coating system consisting of a vacuum plasma sprayed NiCrAlY bond coat, an atmospheric plasma sprayed ZrO2 top coat, and a MoSi2 middle coat. The middle layer inhibits oxidation of the nickel-chromium bond coat, thus extending the service life of the TBC system. Paper includes a German-language abstract.
Plasma-Sprayed Ti-6Al-4V Coatings in a Reactive Nitrogen Atmosphere up to 250 kPa
Authors: Guipont V. , Molins R. , Jeandin M. , Barbezat G.
Published: October 2022

Chemical reactions between melted materials and their gaseous environment are generally inherent to the thermal spray process. Measures to promote and control these reactions are the distinguishing characteristic of reactive plasma spraying. In this paper, Ti-6Al-4V nitrided coatings are produced by high-pressure reactive plasma spraying. The coatings are deposited at different pressures up to 250 kPa in a reactive nitrogen atmosphere as well as air in order to study the influence of spraying pressure and atmosphere. The microstructure and phase composition of the Ti-6Al-4V layers are examined with the aid of X-ray analysis, microprobe measurements, and electron imaging. The investigations show that the pressure-supported nitrogen application during spraying led to the formation of fine and coarse TiN in the Ti matrix. Paper includes a German-language abstract.
Laserstrahlbeschichten mit hoher Prozessgeschwindigkeit (Laser Beam Cladding at High Processing Speed)
Authors: Theiler C. , Seefeld T. , Sepold G.
Published: October 2022

Laser beam cladding is a versatile method for the deposition of functional surface layers, the generation of prototypes, and the repair welding of components. It is a thermal process characterized by a highly localized energy input. Powder-fed laser cladding is typically done with a CO2, Nd:YAG, or diode laser scanned at a speed of 0.3 to 1.5 m/min. The present work investigates the extent to which deposition speed and thermal efficiency can be increased. Using a Nd:YAG laser and high scan rates, functional layers a few tenths of a mm thick are obtained and larger surface areas are processed per unit of time. Paper text in German.
Internal Powder Feed Plasma Spray and Formation of the Ceramic Coating
Authors: Gao Y. , Xu X. , Kang Y. , Xin G.
Published: October 2022

Aluminum oxide ceramic coatings are widely used to extend the life of machine components. These protective layers are usually applied via atmospheric plasma spraying. In this study, alumina coatings are produced using a low-power plasma spraying method and assessed based on hardness, porosity, and microstructure. Test results show that alumina coatings applied using low-power plasma spraying with internal injection are harder than those produced using traditional APS techniques. The effect of process parameters, including current, voltage, powder feed rate, and plasma energy, is also investigated. Paper includes a German-language abstract.
High-Enthalpy Plasma Spraying
Authors: George L.C. , Pollard L. , Snyder D. , Young K. , Delcea L.B.
Published: October 2022

Arc instability in conventional plasmas causes variations in particle properties that can lead to poor coating quality and low deposit efficiencies. In this paper, the authors explain how the use of molecular gases with higher enthalpy mitigates the effects of arc instability, resulting in higher spray rates, better coating quality, and lower cost per kilogram of material deposited. They also describe the design and operation of a commercial high-enthalpy plasma spraying system and present and analyze coatings of different materials thereby produced. Paper includes a German-language abstract.
Equipment Engineering and Process Control for Cold Spraying
Authors: Richter P. , Krömmer W. , Heinrich P.
Published: October 2022

This paper provides an overview of the equipment used in cold gas spraying. It discusses the general design and operation of key components, including the nozzle, the control system, the gas heater, and powder feeder. It also describes a typical gas supply system, the recycling of helium, and the provisions for health and safety that are necessary in a spray booth. Paper includes a German-language abstract.
A Study of the Influence of Mounting Media on Quantitative Measurements of Thermal Spray Coatings
Authors: Didier P.A.
Published: October 2022

This study investigates the effect of mounting materials on microstructure and property measurements obtained from thermal spray coatings. Various epoxies and embedding techniques are used and a wide range of layers are examined, including HVOF sprayed WC-Co, Cr3C2-NiCr, and Al2O3-TiO2; plasma sprayed Cr2O3, YSZ, WC-Co, and Ni-Al; and arc sprayed copper and silicon bronze. Image analysis measurements of area percent porosity, thickness, lamellar spacing, and unmelted particles and the results of hardness tests show substantial variation relative to the method used to encapsulate soft and porous coatings. Results indicate that the ideal mounting system for thermal spray coatings would consist of a low viscosity epoxy, to maximize penetration depth, and a high cured hardness, for adequate protection of surfaces and open porosity of hard coating materials. Paper includes a German-language abstract.
Determination of the Integrity of Thermally Sprayed Coatings with a New Laterally Resolving Electrochemical Technique
Authors: Büchler M. , Margadant N. , Siegmann S. , Ilavsky J. , Barbezat G. , Pisacka J. , Enzl R.
Published: October 2022

This paper evaluates an electrochemical mapping method for determining the corrosion resistance and structural integrity of thermally sprayed coatings. In the test setup, a potentiostat is suspended over the test sample, forming an electrochemical cell. The circuit is completed through an electrolyte-containing porous tip. Capillary forces keep the electrolyte on the surface of the tip, preventing transfer to the substrate surface. In the investigation, electrochemical, spatially resolved measurements are carried out on flame and vacuum plasma sprayed nickel-base coatings and compared with the results of salt spray testing. It is observed that the new method offers many advantages being faster, nondestructive, and quantitative in nature. Paper includes a German-language abstract.
Tribological and Corrosion Behaviour of Thermal-Sprayed Polymer-Ceramic Composite Coatings
Authors: Guilemany J.M. , Fernández D. , Lorenzana C. , Delgado J. , Miguel J.M.
Published: October 2022

In this study, polyamide 11 and polyamide-alumina layers are produced by flame spraying and assessed based on microstructure and corrosion and wear resistance. Among the more notable findings: During the spraying process, there is a loss of crystallinity and polymorphism in the polymer due to high heating and cooling rates. Although some particle degradation occurs in flight, it is does not significantly alter the properties of the polymer. Insufficient substrate temperature impedes the melting of the polymer matrix and embedding of the ceramic filler particles, which has a negative effect on the abrasive wear resistance of the resulting composite layer. Overall, the coatings exhibit good corrosion resistance. During electrochemical testing in a saline solution, there was no electrolyte penetration. Paper includes a German-language abstract.
Analysis of the Wire Melting Behavior Depending on Wire Design and Process Characteristics
Authors: Wilden J. , Wielage B. , Schnick T. , Wank A. , Fronteddu P.
Published: October 2022

This study examines the melting characteristics of wire feedstock used in arc and flame spray processes and how they relate to coating quality. A high-speed CCD camera reveals important details in how different types of wire melt away during spraying. Solid and tube cored wires, for example, melt off in a much more continuous manner than grooved wires during high-velocity combustion spraying. During arc spraying, however, no significant differences are observed. The paper also analyzes various coating microstructures and explains how they correlate with the melt off behavior of different wire designs. Paper includes a German-language abstract.
A New Process to Deposit Thin Coatings by Injecting Nanoparticle Suspensions in a dc Plasma Jet
Authors: Wittmann K. , Blein F. , Fazilleau J. , Coudert J.-F. , Fauchais P.
Published: October 2022

This paper describes a new spraying process that uses a special torch to inject aluminum oxide suspensions into a dc plasma jet. Based on the results obtained, a general mechanism of action is proposed in which factors such as acceleration, impact behavior, and heat transfer phenomena play a role. Paper includes a German-language abstract.
Corrosion Behaviour of High Velocity Combustion Wire Sprayed Coatings
Authors: Schiefler M.F.O. , Voyer J. , Gärtner F. , Qi X.
Published: October 2022

This paper investigates the microstructure and corrosion resistance of Hastelloy C-276 and 316L coatings produced by various thermal spray methods, including arc spraying, flame spraying, HVOF spraying, and a recently developed method called high-velocity combustion wire spraying. The microstructures of the coatings were examined before and after corrosion testing in order to gain information on corrosion mechanisms. Several corrosion tests were performed on each sample and various coating properties were measured including thickness, hardness, oxygen content, porosity, and adhesion strength. Test results for sealed coatings and detached layers are also presented in the paper, giving additional insight into corrosion behavior. Paper includes a German-language abstract.
Wear Resistance of Arc-Sprayed Coatings from Powder Wires
Authors: Pokhmurskii V. , Student M. , Dovhunyk V. , Sydorak I. , Pokhmurska H.
Published: October 2022

This paper presents the results of a study on arc-sprayed coatings made from powder-cored wire. The wires used consist of a ferrochromium core with additions of boron, aluminum, and carbon compacted in a steel sheath. The coatings are sprayed using a modified burner operated at 34 V and 140 A with an air jet pressure of 0.6 MPa. During spraying, specimens are rotated at a speed of 60 rpm. XRD analysis is used to examine the initial phase composition of the layers as well as friction-induced changes in the subsurface resulting from block-on-ring wear tests. Cross-sectional examination shows that the coatings have low porosity (∼10%) and small grain size (50 to 150 µm). Based on these findings, it is concluded that the wear resistance of wire arc sprayed coatings is largely determined by powder wire composition, initial coating structure, and the structural stability of the subsurface layer. Paper includes a German-language abstract.
On Line Process Control of Plasma Sprayed Ceramic Coatings with IR Thermographic Imaging
Authors: Gadow R. , Killinger A. , Li C.
Published: October 2022

This paper discusses the use of IR thermography in the development and control of thermal spraying processes. In the experiments, Al2O3 layers are plasma sprayed on steel, aluminum, and glass substrates while recording surface temperatures. The measurements are then used to establish a correlation between temperature control and internal stress in the layer composite. The work shows that substrate preheating and torch kinematics have a significant effect on residual stress. Paper includes a German-language abstract.
Eigenschaften von feinkristallinen Al2O3-SiC-Spritzschichten (characteristics of fine-crystalline Al2O3-SiC spray coatings)
Authors: Weiß H. , Kern E. , Sauer H. , Aumüller B.
Published: October 2022

This paper examines HVOF-sprayed Al2O3-SiC layer systems of differing compositions. The coatings are characterized based on SEM, EDX, and XRD analysis, fracture toughness measurements, and tribological testing. The influence of SiC on mechanical properties is also assessed and a comparison is made with standard alumina coatings. Paper text in German.
Effect of DC Plasma Fluctuations on In-Flight Particle Parameters – Part II
Authors: Bisson J.F. , Moreau C.
Published: October 2022

This paper investigates the influence of plasma variations on the microstructure and application rate of aluminum coatings and compares layers obtained using parameters that result in the same particle properties but different changes in stress. Layers produced in the less stable plasma state were found to be more porous and contained a significantly higher number of unfused particles than those produced under relatively stable conditions. These differences are due to the physical properties of the particle beam as revealed by laser illumination. Paper includes a German-language abstract.
Preparation of Powders and HVOF Sprayed Coatings for Improved Sliding Properties by Addition of Solid Lubricants
Authors: Männikkö U. , Määttä A. , Vuoristo P. , Mäntylä T.
Published: October 2022

This paper describes the production of self-lubricating chromium carbide-nickel coatings using the HVOF spraying process. The present work deals with the preparation of Cr3C2-Ni + CaF2 multicomponent powders and to spray them with a minimum loss of the CaF2 solid lubricating phase. The powders are processed by atomization with subsequent sintering and qualification processes. The microstructure of the powder and resulting layers is characterized by SEM. The content of calcium fluoride in the sprayed layer is determined using the EDS method and compared with its content in the spray powder. Wear resistance is measured using a rubber wheel tester. Paper includes a German-language abstract.
A Comparative Study Between Two Different Process Models of Atmospheric Plasma Spraying
Authors: Boussagol A. , Nylén P.
Published: October 2022

This paper evaluates two CFD tools for predicting particle speeds and temperatures during atmospheric plasma spraying. The investigation is based on varying two parameters: plasma current and gas flow rate. Although the tools differ in accuracy, both proved to be sufficient for optimizing industrial plasma spraying processes. A comparison of the results with experimental data showed the more advanced tool to be capable of predicting variations in particle characteristics when operating conditions change. Paper includes a German-language abstract.
Analytical Transmission Electron Microscopy of Phosphate Sealed Plasma Sprayed Oxide Coatings
Authors: Vippola M. , Ahmaniemi S. , Vuoristo P. , Lepistö T. , Mäntylä T.
Published: October 2022

The main focus of this study is sealed zirconia-based thermal barrier coatings produced by plasma spraying. AEM examinations conducted on phosphate-sealed Y2O3-ZrO2 coatings and orthophosphoric acid sealed MgO-ZrO2 coatings provide detailed information on the phases in the sealed coatings and the bonding mechanism of phosphate-based sealants on zirconia. In the case of aluminum phosphate sealed alumina and chromia, the primary objective is to add clarity on the bonding mechanism by means of transmission electron microscopy. Investigations of the sealing-layer interface indicate that the sealing of the layer lamellas is due to chemical reactions. Paper includes a German-language abstract.
Laser Treatment of Flame and Plasma Sprayed Nickel Alloys
Authors: Żórawski W. , Gontarski D. , Radek N.
Published: October 2022

This paper assesses the effect of laser remelting on nickel-base coatings produced by thermal spraying. NiAl, NiCr, and NiCrAlMoFe layers are deposited on steel substrates via flame and plasma spraying and treated with a CO2 laser operated at different power levels. The treated layers are evaluated based on microstructure, hardness profile, and wear resistance. Plasma-sprayed NiCrAlMoFe layers treated at a power of 1000 W exhibited the highest wear resistance. Paper includes a German-language abstract.
Thermisch gespritzte Al-Al2O3-Schichten von Fülldrähten mit „self propagating high temperature synthesis” (SHS) (Thermal Sprayed Al-Al2O3-Coatings from Cored Wires with Self Propagating High Temperature Synthesis)
Authors: Bach Fr.-W. , Rothardt T. , Babiak Z. , Formanek B.
Published: October 2022

In this paper, metal matrix composite layers are produced by thermal spraying using cored aluminum wire. Two types of wire were produced, one containing mechanically alloyed Al and Cr2O3 powders, the other, Al and AI2O3. The powders undergo self-propagating high temperature synthesis during the spraying process, which has a positive effect on coating properties such as bonding, cohesion, and wear resistance. Different spraying methods were used in the experiments, but satisfactory results were only achieved via atmospheric plasma spraying. Paper text in German.
Qualifikation einer Spritzschicht aus Alumiumbronze für ein Gleitlager (Qualification of a Thermal Spray Aluminum Bronze Coating for Plain Bearings)
Authors: Harmathy P. , Dreger H. , Kießling K. , Volz A.
Published: October 2022

This paper compares the corrosion, friction, and wear properties of thermally sprayed aluminum bronze coatings developed for use on plain bearing surfaces. It explains how the coatings were produced, characterized, and optimized for the intended application. Paper text in German.
Thermal Spraying of High Nitrogen Steels
Authors: Zhao L. , Lugscheider E. , Fischer A.
Published: October 2022

Nitrogen-alloyed steels have outstanding properties, but are rarely used in thermal spraying. In this study, high-nitrogen duplex and austenitic steels are sprayed using APS and HVOF techniques and the resulting layers are evaluated based on microstructure, composition, and corrosion and wear properties. HVOF layers outperformed the APS layers in corrosion and wear testing, with austenitic steel having the highest corrosion resistance, and duplex steel the highest wear resistance. Paper includes a German-language abstract.
The Influence of the Microstructure of Thermal Barrier Coating Systems on Sintering and Other Properties
Authors: Vaßen R. , Ahrens M. , Waheed A.F. , Stöver D.
Published: October 2022

This paper investigates the influence of microstructure on the sintering behavior of thermal barrier coatings. A significant difference is observed between coatings with typical microcracks and those with segmentation cracks. Segmented coatings showed a lower sintering rate and little change in pore size distribution after heat treatment. Conventional coatings, on the other hand, showed an increase in pore diameter and in more porous areas, sintering was more pronounced. All coatings had an elastic modulus in the range of 15-20 GPa, which more than doubled after a 10-h heat treatment at 1200 °C. Paper includes a German-language abstract.
A Comparison of Elevated Temperature Erosion Resistance of Several Carbide Cermet Coatings
Authors: Wang B.Q.
Published: October 2022

This study examines the high-temperature erosion characteristics of carbide cermet coatings produced by HVOF spraying. The coating materials tested include three Cr3C2 cermets, WC, and WC-Cr3C2. A low carbon steel and an arc-sprayed iron-base coating are also tested for reference. A nozzle-type elevated-temperature erosion tester is used to spray bed ashes collected from several coal-fired boilers. Coating samples are analyzed and compared based on composition, surface morphology, erosion wastage, and hardness relative to that of the bed-ash particles. From the comparisons, a number of conclusions are drawn. Paper includes a German-language abstract.
Relationships between In-Flight Particle Characteristics and Coating Microstructure for the Twin Wire Arc Spray Process
Authors: Jandin G. , Planche M.P. , Liao H. , Coddet C.
Published: October 2022

Twin wire arc spraying is widely used in industry due to its low cost and high rate of material deposition. Much has been learned about the process over the course of its use, most recently in regard to the correlation between spray parameters and coating microstructure. The aim of this study is to investigate the behavior of steel particles in nitrogen and air jets and show how in-flight particle characteristics affect coating properties. In the experiments, an optical sensing system is used to measure the velocity, temperature, and size of carbon steel particles fired from a wire arc spray gun set at 100 A and 30V for gas flow rates of 94, 110, 122, and 144 m3/h. The particle data obtained is presented and correlated with coating microstructure, hardness, and oxide content. Paper includes a German-language abstract.
Bonding Mechanisms of HVOF Sprayed Coatings
Authors: Li C.-J. , Wang Y.-Y.
Published: October 2022

This paper examines the bonding characteristics of HVOF sprayed layers. In order to determine the dominant adhesion mechanism, the coatings are applied to substrates of varying surface roughness with powder particles that are completely melted, in one case, and only partially melted, with solid and liquid phases, in another. The spray materials are NiCrBSi and WC-Co. The results of adhesion tests showed that the adhesion of the NiCrBSi layer on the roughened substrate was approximately 40 MPa, while there was no adhesion on the polished substrate. In contrast, the adhesion strength of the WC-Co layer on the polished substrate was between 20 and 40 MPa, and on the roughened substrate, it exceeded that of the binder materials. Paper includes a German-language abstract.
Investigation of the Adhesion Mechanism between Metal Substrates and Thermally Sprayed Ceramic Coatings
Authors: Wielage B. , Steinhäuser S. , Milewski W. , Pokhmurska H.
Published: October 2022

This paper investigates the adhesion of thermally sprayed ceramic particles on metal substrates. Two aluminum oxide powders are applied to nickel-oxide coated steel substrates by detonation and vacuum plasma spraying. SEM and XRD fracture analysis is used to examine the ceramic-metal interface and the morphology of fracture surfaces. In all test samples, failure occurs in the alumina, not at the interlayer boundary, indicating a high level of adhesion between the ceramic and nickel oxide layers. Paper includes a German-language abstract.
Identifikasi Tingkat Berpikir Geometri Siswa Berdasarkan Teori Van Hiele
Authors: Anwar Azwar
Published: October 2022

The purpose of this study was to describe and identify students' level of thinking in doing questions based on Van Hiele's theory and to give an idea to teachers to be able to use learning methods in accordance with Van Hiele's level of thinking at IBNU Abbas Tarakan IT Junior High School. The method used in this research is a combination method (qualitative & qualitative) with sequential model. The research instruments used were tests on Van Hiele's geometry levels, and interview guidelines. Based on the results of the study obtained 3 students were in pre visualization or have not reached Van Hiele's thinking level, 6 students are at level 1 (visualization), 9 students are at level 2 (analysis), and 3 students are at level 3 (informal deduction). Based on interviews students still have difficulty in understanding the relationship between wakes as well as elements in geometry such as theorem, axiom, and definition. In conclusion, Van Hiele's geometry thinking level at Ibnu Abbas IT Junior High School is generally at level 2, namely the analysis stage and has not reached level 4 (informal deduction).

Keywords: Geometry, Level of thinking, Van Hiele Theory
Pengembangan Soal Matematika Berbasis Higher Order Thinking Skills (Hots) Integrasi Kebangsaan pada Siswa
Authors: Sari Iin Tri Sasmita , Adisel Adisel , Syafri Fatrima Santri
Published: October 2022

The purpose of this research is so that the next generation has a balanced knowledge between general knowledge and knowledge of national values. This research uses research and development (R&D). The data used in this study is sourced from validation sheets, validation sheets are used to obtain data about the validation results of experts on HOTS-based math problems. The problem was developed using plomp model consisting of four stages, namely preliminary investigation phase, design phase, realization/construkction phase, test stage, evaluation, and revision phase.  In terms of validity, at the validation stage I, HOTS-based math problems are said to be invalid and not yet feasible to use. In phase II all suggestions of validators have been corrected and are said to be very valid and worth using. The material expert's assessment of the question obtained a percentage result of 84%, fall into the category is very valid. In conclusion, math problems based on higher order thinking skills (HOTS) national integration in students in grade VII even semesters are said to be feasible to use after being declared valid by the material expert.

Keywords: HOTS, Character Education, Math Problems
Meningkatkan Kemampuan Berpikir Kreatif dan Pemecahan Masalah Matematis dengan Pembelajaran Metakognitif
Authors: Irawan Bayu Putra
Published: October 2022

This research aims to find out the influence of mathematics learning with a metacognitive approach to creative thinking skills and mathematical problem solving students of Grade X TKR SMKS 6 Pertiwi Curup. This type of research is Class Action Research (PTK). The subject of this study was grade X students of SMKS 6 Pertiwi Curup which numbered 34 people. Data collection using observation sheets and test sheets. The results showed that the implementation of class actions with metacognitive learning performed well. Students' mathematical creative thinking skills improved, if in the pretest results only 5 students achieved the good category, then in the posttest results as many as 24 students have reached the good category. Indicators solve problems in less categories in pretes and in posttest test results mathematical troubleshooting capabilities show an improvement. The pretest results did not reach either category, so in the posttest results for cycle I as many as 11 students reached the good category and in the posttest result cycle II as many as 28 students were able to achieve the good category. In conclusion, learning mathematics with an effective metacognitive approach improves the creative thinking and mathematical problem solving skills of students in Grade X of SMKS 6 Pertiwi Curup.

Keywords: Creative Thinking Ability, Students' Mathematical Problem Solving, Metacognitive Learning
Validasi Modul Matematika Teknik Berbasis Mind Mapping
Authors: Yannuansa Nanndo , L Jati Widyo , Samudra Agung Widyo
Published: October 2022

The purpose of this study was to see the mind mapping in terms of the quality of the material and media feasibility of validation by module experts. Expert validation is needed in module development so that the module is feasible or not used. Aspects that are validated are aspects of the module material including content, language, and media aspects of the module including presentation, and graphics. In looking at the quality aspect of the need analysis and validation of making a mind mapping based technique mathematics learning module by testing its feasibility before use. The validation analysis in the module uses methods from Crocker and Algina. The data instrument in this study was a validation questionnaire sheet. The results showed that the average feasibility aspect for the media was 89.79% and the material was 86.09, a total of 86.83%. In other words, the Mind mapping-based engineering mathematics module fulfilled the feasibility aspect. In conclusion, the Mind mapping-based engineering mathematics module developed is feasible in terms of media and module material.

Keywords: Mathematical Techniques, Mind mapping, Modules, Validation
Pengembangan Modul Matematika Diskrit Berbasis ARIAS pada Mahasiswa Teknik Informatika
Authors: Lazulfa Indana , Putra Dharma Bagus Pratama
Published: October 2022

This research aims to develop modules based on ARIAS learning models, to improve learners' learning motivation, as well as student competencies. So it will be found that meets the criteria of effectiveness, practicality and validity of the module based on ARIAS. The development model refers to the development of Borg and Gall which consists of two main parts namely designing modules and validating modules. To validate the module is carried out a validity test, a practicality test and an effectiveness test. Research Results, validation test conducted by material experts and media experts with results of 86.02 and 82.47 to meet the criteria of validity. The practicality test was carried out by practicing lecturers and 4 students obtained grades of 81.75 and 86 so that they entered practical criteria. Test effectiveness using one-group-pretest-posttest and obtained N-Gain¬ 60.95 so that it is included in the criteria is quite effective. In conclusion, discrete math modules based on arias learning models developed are feasible to be used in the sense of valid, practical and effective use, proven to increase the motivation of learners' learning, as well as the competence of learners.

Keywords: ARIAS, Discrete Mathematics, Module Development.
Pengembangan Bahan Ajar Matematika Berbasis Model Pembelajaran Jucama untuk Meningkatkan Kemampuan Pemecahan Masalah dan Kemampuan Komunikasi Matematis Siswa
Authors: Fitriyana Nur , Widada Wahyu , Dharmayana I Wayan
Published: October 2022

The purpose of this study was to produce mathematics teaching materials based on the JUCAMA Learning Model to Improve Problem Solving and Mathematical Communication Skills of Students in Class VII SMPN 3 Sindang Kelingi, Rejang Lebong Regency. This research is a development research using a modification of the 4-D development model (Define, Design, Develop, Disseminate) which is limited to the 3rd stage. The subjects of this study were 30 students of Class VII SMPN 3 Sindang Kelingi, Rejang Lebong Regency. Based on the results of the study, it can be concluded that: Mathematics teaching materials based on the JUCAMA learning model are valid, practical, and effective. The results of the development of mathematics teaching materials based on the JUCAMA learning model can improve problem solving skills with an average achievement of 79.8% which is classically included in the high category and can improve mathematical communication skills with an average achievement of 81% which is classically included in high category. Conclusion. Mathematics teaching materials based on the JUCAMA learning model can improve students' problem solving and mathematical communication skills, besides that the teaching materials developed are valid, practical, and effective in orienting students through solving and proposing mathematical problems.

Keywords: Learning Materials, Learning Model JUCAMA, Problem Solving Ability, Mathematical Ability Communication
Pengaruh Penerapan Model Pembelajaran Teams-Games Tournament (TGT) terhadap Disposisi Matematis dan Hasil Belajar Matematika Peserta Didik
Authors: Indrawan I Putu Eka
Published: October 2022

This study aims to determine the effect of the application of the Teams-Games Tournament (TGT) learning model on the mathematical disposition and learning outcomes of eighth grade students of SMP Negeri 3 Abiansemal in the 2020/2021 academic year. This type of research is classified as a Quasi Experiment with a Non Equivalent Posttest-Only Control Group Design research design. The population in this study were all students of class VIII SMP Negeri 3 Abiansemal as many as 12 classes with a total of 357 students. Two classes as samples with simple random sampling technique, namely class VIII G with 30 students as the experimental group and class VIII H with 30 students as the control group. The data obtained are quantitative data in the form of mathematical disposition scores (using a questionnaire) and mathematics learning outcomes (using an essay test). Analysis using MANOVA with the help of SPSS 23.0 for Windows. Based on the hypothesis test obtained: 1) there are differences in mathematical dispositions between students who follow the Teams-Games Tournament (TGT) learning model and students who follow the conventional learning model; 2) there are differences in mathematics learning outcomes between students who follow the Teams-Games Tournament (TGT) learning model and students who follow the conventional learning model; 3) there are simultaneous differences in mathematical dispositions and learning outcomes between students who follow the Teams-Games Tournament (TGT) learning model and students who follow the conventional learning model for class VIII of SMP Negeri 3 Abiansemal in the 2020/2021 school year. In conclusion, the results of the hypothesis test indicate that there is an effect of the application of the Teams-Games Tournament (TGT) learning model on the mathematical disposition and learning outcomes of eighth grade students of SMP Negeri 3 Abiansemal.

Keywords: Teams-Games Tournament (TGT) Learning Model, Mathematical Disposition, Mathematics Learning Outcomes
Pengenalan Konsep Matematika di Masa Pandemi Covid–19 untuk Anak Usia Dini Menggunakan Alat Peraga
Authors: Zuniasari Anna , Syafri Fatrima Santri , Yusniarti Leta Santri , Rahmat Reno Gustika
Published: October 2022

This study aims to make efforts to introduce mathematical concepts during the Covid-19 pandemic for early childhood using teaching aids. This research is a type of library research or library research. Research result. Research result, there are several mathematical concepts that must be taught to early childhood, namely: (1) The concept of numbers (2) The concept of patterns and relationships (3) The concept of geometry and geometry (4) The concept of selecting and classifying (5) The concept of measurement (6) The concept data collection and display. In planting this mathematical concept, props are needed to make it easier for children to understand the mathematical concept. Props used to be taught by parents by connecting to the context of everyday life. This is in accordance with the introduction of mathematical concepts during the COVID-19 pandemic for early childhood using visual aids in understanding mathematical concepts during the COVID-19 transition. In conclusion, parents have an important role in the introduction of mathematical concepts in early childhood, the use of teaching aids in the surrounding environment is the easiest method in increasing understanding of simple mathematical concepts in early childhood.

Keywords: Mathematical Concepts, COVID-19, Early Childhood, Teaching Aids
Hubungan Antara Disiplin Belajar dengan Hasil Belajar Statistika Dasar
Authors: Sumiyani Sumiyani
Published: October 2022

This study aims to determine how big the relationship between learning discipline and basic statistics learning outcomes for students of Indonesian language and literature education in semester 1 of basic statistics course. The method used in this study is a descriptive method, which is a study that seeks to describe current problem solving based on existing data. The population and sample are students in the odd semester 2021/2022 class 5A.1. 5A.2 totaling 40 students. The results of the study, in general the student learning discipline went well. In general, student learning outcomes were categorized as good, as seen in the basic statistics learning outcomes obtained from daily test scores which had a value of 1550 with an average of 77.5. from the results of the calculation of t arithmetic of 3.785 and t table of 2.093, thus t arithmetic is greater than t table which means the hypothesis is accepted. In conclusion, there is a positive relationship between learning discipline and student learning outcomes in odd semesters of PBSI FKIP UMT Study Program

Keywords: Learning Discipline, Learning Outcomes, Statistics
Epidemiological Aspects of the Management of Heart Failure Patients Seen in Cardiological Consultations in the National Hospital of Niamey
Authors: Idrissa Hama
Published: October 2022

Background/Aim: Heart failure is defined as a structural or functional abnormality of the heart resulting in an inability to supply the tissues with oxygen at a rate commensurate with their needs. Objective: To contribute to a better knowledge of the epidemiological aspects of the treatment of in charge of patient’s heart failure patients. Materials and Methods: This is a prospective, cross-sectional study conducted over a period of 6 months (February 2020 to October 2020 without April et May due to Covid) Result: Thus, our sample consisted of 300 cases. The average age was 56.9 +13.7 years with extremes ranging from 19 to 98 years. Housewives were the most represented at 43.7%. High blood pressure and sedentary lifestyle were the most common DRFs in 95% of the patients, followed by obesity in 22.3%. In 61.3% of the cases, patients knew they had heart disease but did not know the type. Unusual shortness of breath on exertion was the main sign that prompted patients to consult a doctor (67.7%). Only 2% weighed themselves regularly. All of our patients (99%) were aware of the recommendation for sodium restriction and more than half (58.3%) had adapted to a low-salt diet. Only 23.2% of our patients drank less than 1.5L per day. 29.7% of our patients were not physically active. Regarding treatment, diuretics were the most used as specific treatment in 64.3% of cases and antiplatelet agents in 12.3% of cases. Conclusion: Our study has highlighted educational gaps in the heart failure population. Further studies may help to initiate a therapeutic education approach for patients in order to improve their quality of life and Morbi-mortality.
A new species of the genus Ornithomya (Diptera: Hippoboscidae) from the Far East
Authors: Nartshuk E.P. , Yatsuk A.A. , Matyukhin A.V. , Shokhrin V.P.
Published: October 2022

A new species of the genus Ornithomya Latreille, 1802 (Diptera: Hippoboscidae), O. strigilis sp. nov., is described from the Lazovsky Nature Reserve (southern part of Primorskiy Territory, the Far East of Russia). The new species differs from other Palaearctic species of Ornithomya in its large body size, the number of long setae on the scutellum, and the arrangement of microtrichia (setulae) on the wings. An updated key to the Palaearctic species of Ornithomya is provided.
Systemic sclerosis-associated compressive cervical calcinosis: intersection of degenerative spine instability, lesional spinal cord compression, and traumatic spinal cord injury. Illustrative case
Authors: Pham Thu Lan , Miao Jingya , Singh Harminder , Lee Marco B. , Cage Tene A.
Published: October 2022

BACKGROUND

Tumoral calcinosis, mass-like calcium deposition into the soft tissues, is an uncommon manifestation of the systemic sclerosis subtype of scleroderma. When this process affects the spinal epidural space, it can cause canal narrowing and place the spinal cord at significant risk of injury.

OBSERVATIONS

Here a 62-year-old female with systemic sclerosis and no previous evidence of spinal cord compromise who developed acute spinal cord injury and quadriparesis after a mechanical fall is described. She was found to have a large dorsal epidural calcified mass compressing her cervical spinal cord. She underwent medical management for acute spinal cord compression as well as surgical management for acute spinal cord injury and degenerative spine disease. Her case illustrates a rare etiology of simultaneous degenerative spine instability and lesional spinal cord compression with acute spinal cord injury.

LESSONS

Tumor calcinosis leading to acute spinal cord injury in the setting of systemic sclerosis is an uncommon but critical entity to recognize in patients with scleroderma and may require the physician to use a combination of medical and surgical management strategies from each of these categories of spine pathology.
Bypass surgery for ruptured dissecting aneurysms of the proximal posterior cerebral artery: illustrative case
Authors: Hayashi Tetsuya , Endo Hidenori , Kanoke Atsushi , Kawaguchi Tomohiro , Tominaga Teiji
Published: October 2022

BACKGROUND

Posterior cerebral artery (PCA) dissecting aneurysms commonly occur in the proximal PCA and are considered rare. The treatment of proximal PCA dissecting aneurysms is challenging because of the existence of perforators supplying the vital neural structures. Recently, endovascular intervention has been used; however, concerns for ischemic or hemorrhagic complications exist.

OBSERVATIONS

A 54-year-old woman presented with subarachnoid hemorrhage due to dissecting aneurysm rupture at the P1-P2 junction of the PCA. The thalamoperforating artery (TPA) and medial posterior choroidal artery (MPchA) originated from the proximal end and the distal end of the aneurysm, respectively. Additionally, the posterior communicating artery (PcomA) connected with the dissected segment. To preserve these perforators, we performed surgical trapping combined with superficial temporal artery (STA) PCA anastomosis. Clips were applied for trapping the proximal and distal end of the aneurysm, with preservation of the TPA and MPchA origin. PcomA was left open for blood flow preservation to the perforators directly arising from the aneurysm. The postoperative course was uneventful, and the patient was discharged.

LESSONS

Surgical trapping using STA-PCA bypass could be a treatment of choice for proximal PCA dissecting aneurysms, considering its potential for cure and prevention of ischemic complications.