bluuebunny/crossref_metadata_2025 huggingface dataset:
PERAN PERUSAHAAN KELUARGA, DIVERSIFIKASI PERUSAHAAN DAN LEVERAGE DALAM MANAJEMEN LABA
Authors: Damara Devina , Lembut Putu Indrajaya , Oktariani Fitri
Published: August 2023

Penelitian ini bertujuan untuk membuktikan keterkaitan antara perusahaan keluarga, diversifikasi perusahaan dan leverage terhadap manajemen laba dengan good corporate governance sebagai variabel moderasi. Manajemen laba diproksi dengan menggunakan discretionary accrual. Variabel utama dependen dalam penelitian ini yaitu perusahaan keluaraga, diversifikasi  perusahaan dan leverage. Peneliti juga melakukan uji beda pada variabel leverage sebelum dan selama Covid19. Sampel dalam penelitian ini adalah perusahaan keluarga di bidang manufaktur yang terdaftar di BEI pada periode 2017-2021. Sampel uji beda pada penelitian ini menggunakan tahun 2018-2019 sebelum Covid19 dan 2020-2021 selama Covid19. Jumlah sampel penelitian ini 14 perusahaan. Hipotesis penelitian diuji dengan menggunakan Partial Least Square Structural Equation Modeling dengan software SmartPLS 4.0 dan SPSS. Penelitian ini menunjukan  bahwa tidak terdapat hubungann yang signifikan antara perusahaan keluarga dan leverage dengan manajemen laba. Variabel diversifikasi berpengaruh negatif terhadap manajemen laba. Variabel Good corporate governance tidak mampu memperlemah pengaruh perusahaan keluarga, diversifikasi perusahaan dan leverage terhadap manajemen laba. Sedangkan, tidak terdapat perbedaan sebelum dan selama Covid-19 terhadap leverage.
PERAN PERCEIVED VALUE DAN FREQUENCY CONSUMPTION TERHADAP REPURCHASE INTENTION KONSUMSI BUAH DI MASA PANDEMI COVID-19
Authors: Audrina Sheila Okthalia , Immanuel Dewi Mustikasari
Published: August 2023

Penelitian ini bertujuan untuk mengetahui pengaruh healthy consumption, perceived price fairness, perceived quality, terhadap repurchase intention konsumsi buah-buahan di tengah situasi pandemi COVID-19 dengan frequency consumption sebagai moderator dan perceived value sebagai mediator. Data kuisioner diolah dengan menggunakan PLS. Populasi dalam penelitian ini adalah masyarakat yang pernah membeli buah-buahan di Surabaya dan Sidoarjo. Teknik pengambilan sampel yang digunakan adalah purposive sampling dengan jumlah sampel sebanyak 386 responden. Hasil penelitian ini menunjukkan bahwa healthy consumption, perceived price fairness, perceived quality berpengaruh positif terhadap repurchase intention, dan perceived value memberikan efek mediasi penuh, sedangkan frequency consumption sebagai pemoderasi ditemukan memperlemah pengaruh healthy consumption terhadapa repurchase intention.

Kata kunci: Healthy consumption, frequency consumption, perceived price fairness, perceived quality, perceived value, and repurchase intention.
ANALISIS MOTIVASI BELAJAR MATEMATIKA SISWA SMA KETIKA KEMBALI BELAJAR TATAP MUKA
Authors: Sulis Regita Cahyani  , Warmi Attin
Published: August 2023

AbstractThis study aims to find the motivation to learn mathematics at high school (SMA) students when they return to face-to-face learning at school. This research is a qualitative research with descriptive analysis method. The population in this study were students of class XI MIPA 3, in one of the public schools in the Karawang district for the academic year 2022/2023. The sample used in this study were 36 students. The data collection technique in this study used a high school student learning motivation questionnaire when returning to face-to-face learning which contained 23 statements with 12 positive statements and 11 negative statements and conducted interviews with students. The results of data analysis in this study were at a percentage of 74% which showed that students had a good level of motivation to learn mathematics when they returned to face-to-face learning at school.Keywords: Learning Motivation, Online Learning, Face-To-Face Learning
PENGARUH KECERDASAN INTERPERSONAL TERHADAP PRESTASI BELAJAR MATEMATIKA
Authors: Saragih Asido
Published: August 2023

This study aims to determine whether there is a positive and significant influence of interpersonal intelligence on mathematics learning achievement. This research was conducted at Strada Mardi Utama 1 Middle School, Jakarta in 2015. The method used was a quantitative-survey method. The samples used were 84 grade VIII students of SMP Strada Mardi Utama 1 Jakarta taken by random sampling or simple random sampling from two classes. Data analysis was performed using the correlation test, regression test, and ANOVA test. The results showed that there was a positive and significant influence of interpersonal intelligence on the mathematics achievement of Grade VIII students of SMP Strada Mardi Utama 1 Jakarta.
BERPIKIR KOMPUTASIONAL SISWA SMP DALAM MENYELESAIKAN MASALAH MATEMATIKA
Authors: Meitjing Paranita , Fuad Yusuf
Published: August 2023

The important skill to be applied in the 21st century is computational thinking (CT). Students need to develop computational thinking skills by being trained to solve open-ended problems. The descriptive qualitative method is the method used in this research. This research aims to describe the computational thinking skills of junior high school students in solving open-ended mathematical problems by explaining each component of computational thinking, namely abstraction, decomposition, algorithmic thinking, generalization, and debugging. The subjects of the research were several 8th-grade students from a private junior high school in Surabaya, consisting of 55 students who had been given TKM and TPM. Then, 3 students with different categories who provided unique answers were selected. Student in the low computational thinking category (BK1) do not fulfill all computational components. Student in the moderate category (BK2) have incomplete results in the final solution, and the problem-solving methods provided are also inadequate, resulting in imperfect final outcomes. Student in the high computational thinking category fulfill all computational components. Student (BK3) provides correct and varied problem-solving methods and solutions.
PENERAPAN MODEL PEMBELAJARAN STUDENT TEAM ACHIEVEMENT DIVISION UNTUK MENINGKATKAN KEMAMPUAN MATEMATIS
Authors: Mallini Putri Saron , Purba Santri Chintia , Sihotang Hotmaulina
Published: August 2023

Mathematics learning is designed to achieve the objective of mathematics learning, that is to stimulate students to grow their mathematical abilities. However, the activities of teaching-learning have been applying the conventional learning method, in which the teacher has full control of learning so that students' mathematical abilities are classified as low. The learning model that is applied to the solution to improve students' mathematical abilities is Student Team Achievement Division (STAD). This research involved VIII classes of SMP Negeri 50 Jakarta, which are VIII-B and VIII-D classes using a Quasi-Experimental Design. Data collection was based on a pretest, posttest, and gain data by statistical test through the Mann-Whitney U test by the calculation of the program SPSS 26 because the data is not a normal distribution and not homogeneous so that it is obtained that: (1) There is a difference in mathematical ability between students who apply STAD and Expository learning models. The average posttest score of mathematical ability between students with the STAD learning model treatment is superior to the Expository learning model, that is 66,64 and 15,78. (2) There is a difference in improving mathematical ability between students who apply the STAD and Expository learning models. The average gain score of mathematical ability between students who apply the STAD learning model is superior to the Expository learning model, that is 64,56 and 13,08.
ANALISIS TINGKAT KONSENTRASI BELAJAR MATEMATIKA SISWA KELAS VII-H SMPN 2 MAJALAYA KARAWANG
Authors: Sihotang Rontauli , Sihotang Hotmaulina , Stevi Natalia
Published: August 2023

Since a government policy that mandated social isolation or restrictions on social interaction to prevent the spread of the COVID-19 virus, online education has been practiced in Indonesia. Various communication tools, such as Google Classroom, Google Meet, Zoom, Edmodo, or WhatsApp, are used for online learning activities. In the current state of online education, many factors contribute to students becoming sluggish or disinterested in their studies, such as the fact that it requires a high level of concentration, time, and energy, as well as feelings of compulsion to abandon some activities that, in comparison to learning, are more enjoyable. others, both positive and negative exercises. Therefore, the purpose of this study is to investigate the learning concentration level of students in class VII-H at SMPN 2 Majalaya Karawang. by employing qualitative exploratory techniques. The findings indicate that students in grades VII through H have a moderate level of concentration.
ANALISIS KREATIVITAS SISWA DALAM PEMBELAJARAN EKONOMI
Authors: Syamsuri  , Selvilianawati Selvilianawati , Sulistyarini Sulistyarini
Published: August 2023

The purpose of this study was to determine the Creativity of Class X IPA 2 SMAN 2 Sungai Raya in Economic Learning, namely in understanding the material and doing assignments. The research method in this study uses a qualitative approach. Qualitative research is a method used in natural object conditions, where the researcher is the key instrument in taking random data sources, triangulation techniques, qualitative data analysis and the results of research are more about meaning. the form of research used is a case study. The informants in this study were Subject Teachers and Class X IPA 2 Students at SMAN 2 Sungai Raya, namely 1 teacher and 18 students. Data collection techniques using direct interviews, observation and documentation. The results of this study indicate that when understanding the subject matter there are 9 students with a percentage of 50.00% who can fulfill the characteristics of creativity, namely Originality, Fluency, Flexibility, Elaboration, whereas when doing assignments there are 12 students with a percentage of 66.67% who are at level 3 which is very creative because they can fulfill the 3 components of creativity which consist of fluency, flexibility, and elaboration.
ANALISIS HASIL PENGELOLAAN TANAMAN JAGUNG UNTUK MENINGKATKAN KESEJAHTERAAN MASYARAKAT KECAMATAN SUELA
Authors: M. Juaini  , Badarudin Badarudin , Muhammad Khairul Wazni Muhammad Khairul Wazni
Published: August 2023

This study aims to determine how the maize crop management results can improve the welfare of the community in Suela District, and to determine the impact of the maize crop management pattern to improve the community welfare in Suela District. The results of the study show: first, in the results of corn crop management several management activities are carried out, namely preparation, implementation of supervision, harvest and post-harvest. Management of corn plants is carried out to minimize the occurrence of a loss to corn production. Second, the impact of corn management patterns to improve people's welfare seen from the level of welfare according to BPS includes household income, expenditure or consumption, living conditions, household facilities, health of family members, ease of obtaining health services, and ease of entering children into education levels. Based on the results of the analysis of the management results of corn plants, it is known that the level of community welfare in Suela District is at a high level of 90% and a medium level of 10%.
RATLARDA OMEGA-3 YAĞININ AKUSTİK TRAVMAYA ETKİSİ
Authors: BABAOĞLU DEMİRÖZ Gizem , ÇULHAOĞLU Belde , ERBEK Seyra
Published: August 2023

Akustik travmaya bağlı işitme kaybı sık görülen işitme kaybı nedenlerindendir. Akustik travma sonrasında tüy hücrelerinin hasarı sonucu kalıcı veya geçici işitme kayıpları görülür. Güçlü bir antioksidan olarak bilinen Omega-3 yağı, vücudun üretemediği ve dışarıdan alınması gereken bir yağdır. Çalışmamızın amacı omega-3 kullanımının akustik travma üzerine etkisini araştırmaktır. Çalışmamıza 24 adet sağlıklı, ortalama ağırlıkları 350 gr, yaş ortalaması 12 ay olan Sprague Downey cinsi erkek ratlar dahil edilmiştir. Ratlar her grupta 8’er olacak şekilde 3 gruba ayrılmıştır. Birinci gruba vücut ağırlıklarının 150 mg/kg sıvı Omega-3 yağı akustik travma öncesinde ve sonrasında verilmiştir. İkinci gruba akuştik travma oluşturmadan sadece Omega-3 yağı aynı dozda verilmiştir. Üçüncü gruba ise sadece akustik travma uygulanmıştır. Akustik travma öncesi, akustik travma sonrası ve akustik travma sonrası 10. gün işitme fonksiyonları distorsiyon ürünü otoakustik emisyon (DPOAE) ile değerlendirilmiştir. Akustik travma öncesi yapılan ölçümlerde tüm ratların eşikleri benzer olarak bulundu (p>0,005). Akustik travma uygulanan iki grup DPOAE ölçümleri karşılaştırıldığında travma öncesi Omega-3 yağı kullanan grubun işitme eşiklerinin korunduğu ve eşikler arası fark olmadığı saptanmıştır. Omega-3 kullanmayan grupta ise eşikler anlamlı şekilde düşmüştür. Aksutik travma uygulaması sonrası 10. günde yapılan ölçümlerde ise kontrol grubunun işitme eşiklerinin akustik travma öncesi eşiklerine yakın olduğu belirlendi. Sadece Omega-3 kullanan grubun işitme eşiklerinde bir değişiklik bulunmadı. Çalışmamızın sonucunda Omega-3 yağının kullanımının akustik travmada koruyucu etkisi olduğu görülmüştür.
Effect of statin on anticardiolipin antibody levels in coronary artery bypass surgery
Authors: ENVER Levent , OKTAR Gürsel Levent , KARAKUŞ Resul , ARSLAN Mustafa
Published: August 2023

Objectives: The aim of this research is to study the link between lipid lowering mechanism and other beneficial biological effects of statin in patients of coronary bypass surgery by revealing the relation of preoperative statin on pre- , peri- and postoperative cardiolipin IgG and IgM antibody levels. The case in open cardiac surgery was not keeping the heart beating only but preventing or minimizing the myocardial injury. For this reason, a new method for preservation of blood elements and myocardium must be uncovered. Material and Methods: Thirty patients with coronary ischemic disease whose scheduled to undergo elective coronary artery bypass graft surgery and fitting the criteria for our research were divided in to two groups, those on standard lipid lowering therapy using atorvastatin ( 40 mg/day ) for at least 7 days prior to surgery (group A) and second group those without regular lipid lowering therapy preoperatively (B). All the parameters were documented and recorded, including demographic, hemodynamic, laboratory and surgical technique with outcome. Results: The recorded parameters and values were analyzed using the following tests in computer program: Kolmogorov- Smirnov test, student t test, paired t test and Chi- square test. All results were scheduled in 6 tables for simple and better evaluation. Conclusion: The findings support the beneficial effects of statin in the perioperative and early postoperative (first 24 hours) in open cardiac surgery.
DEVELOPMENT OF STUDENT WORKSHEETS (LKPD) BASED ON COOPERATIVE LEARNING TYPE STAD IN CLASS VII EARTH MATERIAL
Authors: Ayu Wahyuni  , Nindha Ayu Berlianti
Published: August 2023

The purpose of this development is to develop LKPD Student Team Achievement Divisions (STAD) Cooperative Learning-based worksheets on Class VII Earth Layer Material based on validity tests. The research method used is based on the ADDIE development procedure by describing the feasibility of the LKPD which was developed based on the Validity Test, the LKPD which was developed based on Cooperative Learning type Student Team Achievement Divisions (STAD) for the material on Layers of the Earth in Class VII. The results of the development carried out produced LKPD in accordance with the suggestions and input from the supervising lecturers and validators from material experts, media experts and science teachers. The results of the validator's assessment of Student Team Achievement Divisions (STAD) Cooperative Learning-based LKPDs show that the LKPD developed gets an average score of 4.52 for LKPD 1 in the very valid category and 4.39 in the very valid category for LKPD 2.
Zr-DLC coatings - analysis of the friction and wear mechanisms
Authors: Vitu Tomas , Pimentel Bernando Joao Vitor , Escudeiro A. , Cavaleiro Albano , Polcar Tomas
Published: August 2023

In the last few decades, the amorphous or nanostructured carbon structures prepared by several deposition techniques are a subject of considerable research interest due to their excellent properties, such as high hardness and chemical inertness, wear resistance or low friction. There have been also attempts to improve the mechanical, chemical or tribological properties of carbon coatings by addition of other elements. Generally, specific chemical composition of the modified films strongly affects the surface energy, and may modify various physical properties and decrease compressive stress, making some metal-doped carbon films suitable for large variety of practical applications. Our work was focused on the structural, chemical and tribological properties of Zr-doped DLC coatings with controlled composition. The main attention was paid to the determination of the wear mechanisms, characterization of the worn surfaces and wear debris and formation of a tribolayer affecting the tribological process. The as-deposited coatings and worn surfaces were studied using 3D optical profilometry, Raman spectroscopy, X-Ray diffraction (XRD) and Scanning electron microscopy (SEM).
The Study about Surface Modification of Steel by Water Plasma
Authors: Kong Jung-Hyun , Takeda Tomonori , Okumiya Masahiro , Tsunekawa Yoshiki , Yoshida Masashi , Kim Sang Gweon
Published: August 2023

Recently, a lot of research has been carried out to improve the properties of steel surface such as ion-nitriding, gas nitriding. However, they need high vacuum rate or very expensive equipment and longer treatment time. In this study, new nitriding process proposed which have extremely shorter treatment time and very simple equipment by using water plasma. For the water plasma, JIS-SCM420 specimen was used as cathode, and rolled punching stainless steel plate (SUS304) was used as anode. Voltage was applied between electrodes by DC pulsed power supply. Pulsed power supply was used to prevent discharge from concentrating on one point. Urea (H2N)2C=O used as supply source of nitrogen and potassium hydrate (KOH) for adjusting electric conductivity. And it was put into distilled water as electrolyte. Treatment voltage was 600 V, and experiments were conducted by varying conditions such as treatment time and concentration of electrolyte. After water plasma treatment, a lot of fine discharge pores can be seen on the treated steel surface. And also, a few µm modified layer is formed on the steel surface after water plasma treatment within 5min. At the results of XRD analysis, iron nitrides are detected with Fe peaks and the hardness of nitride layer shows about 800HV.
Sensitization of Er3+ Emission in Er- and Yb-doped Si Thin Films by Laser Ablation
Authors: Kawai Shinji
Published: August 2023

Erbium (Er)- and ytterbium (Yb)-doped Si (Si:Er,Yb) thin films have been controllably synthesized over the Er and Yb concentrations ranging from 1018 to 1020 cm-3 by laser ablation technique. From the PL spectra and the concentration dependence of the intensity of Er3+ emission at 1.54 µm, Yb3+ acts as an efficient sensitizer of the Er3+-related PL. Enhancement by a factor of 1.5 due to Yb codoping is observed from the Si:Er,Yb films.
Rapid Stripping of Brass-plating on Fine Saw Wire by Triangle-type Multiple Magnetron Plasmas
Authors: Fujiyama H. , Miyazaki K. , Matsuo N. , Kobayashi Y. , Shinohara M. , Nishiyama S.
Published: August 2023

To remove brass plating on fine saw wire, line-shaped magnetron plasma source has been newly developed. New type of multiple plasma sources has been developed by applying to multiple-triangle-type electrodes. The stripping effects were successfully established by using high density magnetron source with 20mm gap in an axially applied magnetic field. From the EDS analysis results of wire surface after plasma stripping during 30sec, it is clearly shown that Zn was removed after 10sec stripping and Cu after 30sec. (Fe:38.5%?97.7%, Cu:39.3%?2.43%, Zn:22.2%? 0.03%)
Influences of surface-active substances on specific power inputs and on surface roughnesses of the metal product under plasma vacuum arc treatment
Authors: Arustamov V.N. , Ahsurov Kh.B. , Kadirov Kh.Kh. , Khudaykulov I.Kh.
Published: August 2023

The use of the vacuum arc for cleaning of the material surfaces and for removal of various contaminations is an actual problem in view of essential advantages of this cleaning method in comparison with chemical, mechanical and other ones and, first of all, in view of absolute environmental safety of vacuum arc method [1-5]. However, in the case of vacuum arc cleaning of some kinds of the hot rolled metals covered with relative thick (6-12 microns) layers of oxide, the roughness of the surfaces after cleaning sometimes exceeds the necessary limit of 10-14 microns. Cleaning of such steels of thick layers and removal of the scale is accompanied by the large power inputs. It is a reason of necessity of improvement of plasma vacuum arc technology and of the study of the interaction mechanisms of cathode plasma of the vacuum arc with the material surfaces.
Hydrophilization treatment of polyimide using Ar-O2 mixture gas surface wave plasma – Oxygen radical density and plasma parameter dependence
Authors: Hirukawa Yoshinari , Ono Shigeru , Syuichi Suzuki
Published: August 2023

The hydrophilization treatment of polyimide is important in various applications. This paper has described the experimental research findings which explore what the parameter with large effect in the plasma treatment of polyimide is. The low pressure surface wave plasma of the argon oxygen mixed gas which can expect large homogeneity spatially was used for the experiment. The plasma state was measured by the electrostatic probe. The oxygen radical expected to be active species important for surface treatment was measured by the catalyst probe. It turned out that it depends for the water contact angle on the surface of polyimide by which plasma treatment was carried out in an oxygen radical density strongly.
Plasma Directed Assembly: Process Issues, Materials and Applications
Authors: Kontziampasis Dimitrios , Smyrnakis Athanasios , Constantoudis Vassilios , Gogolides Evangelos
Published: August 2023

Not available
Oxygen effect in Magnetron Sputtered Aluminum doped Zinc oxide films.
Authors: Rahmane Saad , Djouadi Mohamed Abdou , Aida Mohamed Salah , Barreau Nicolas
Published: August 2023

In this work, polycrystalline transparent conductive aluminum doped zinc oxide (ZnO:Al) films, have been successfully grown on glass and silicon substrates by rf magnetron sputtering technique at room temperature. The effect of oxygen content in plasma on the structural, optical and electrical properties of the films was systematically studied. The growth rate was fond to decrease with the increase in O2 content. The crystal structure of ZnO:Al films deposited on glass is hexagonal with C axis preferential orientation, while for film deposited on silicon substrate, the preferred orientation of crystallite shifts from (002) to (100) direction with the increase in O2 content. Intrinsic stress increases with an increase of oxygen content, and near stress-free film was obtained at 0 % O2 content. Low resistivity (?= 1.25x10-3 Ocm) associated to high transmittance (T>92 %) in the visible regions, were obtained for ZnO:Al film deposited at room temperature without oxygen content in the deposition chamber. From the optical characterization, we deduced that the band gap shifts towards lower energy with an increase of oxygen content.
Photocatalytic, hydrophilic titanium dioxide prepared by direct current magnetron sputtering
Authors: Bernsmann Falk , Grabowy Udo
Published: August 2023

Not available
Mechanism of Ti99.2 titanium unconventional ion nitriding
Authors: Fraczek Tadeusz , Michalski Jerzy , Olejnik Michal , Jasinski Jaroslaw
Published: August 2023

Not available
Effect of low temperature air plasma treatment on physico-chemical properties of kaolinite
Authors: Lapcik Lubomir , Krasny Ivo , Kupska Ivana , Barbora Lapcikova Barbora
Published: August 2023

It was found in this study that air plasma treatment of particular kaolinite has led to the change of its wettability. This was reflected in the decreased values of water contact angles of wetting. There were determined yield locus and flow function dependencies at different stress levels for virgin and different time plasma treated samples (flow index - ffc, effective angle of internal friction - phie, unconfined yield strength - sigmac). It was found that by plasma treatment the character of the flow was shifting from region of very cohesive (ffc = 2.39) to the cohesive (ffc = 3.19). For untreated samples effective angle of internal friction was decreased with increasing applied consolidation stress, while for plasma treated kaolinite it was increased.
Comparison of the wear particle size distribution of different a-C coatings deposited by vacuum arc
Authors: Ren Ying , Erdmann Ingo , Khlopyanova Victoria , Deuerler Friederike , Buck Volker
Published: August 2023

For biomedical application in the field of artificial hip joints diamond-like carbon (DLC) coatings have been widely studied due to their excellent mechanical, tribological and biological properties. The wear particles as the main factor limiting the life expectancy of hip joints have attracted more and more interest, not only the number of them, but also the distribution of their size. In this study we have deposited DLC coatings on stainless steel (P2000) by a vacuum arc adjustable from anodic to cathodic operation mode. To improve the adhesion of the DLC coating on P2000, titanium as a metallic interlayer was deposited by cathodic vacuum arc evaporation. The frequency distribution of wear particles generated using a disc-on-disc test was measured by a particle size analyzer. It was shown that the maximum of the frequency distribution e.g. at —1000 V bias can be shifted to below 1 µm with increasing anode/cathode diameter ratio da/dc.
Effects of Production Method and Heat Treatment on the AdhesionStrength and Microstructural Behavior of MCrAlY Coatings
Authors: Dikici H. , Karaoglanli A. C. , Grund T. , Lampke T. , Kucuk Y.
Published: August 2023

Thermal barrier coatings (TBCs) are widely-used as protective and insulative coatings on hot section components of gas turbines and their applications, like blades and combustion chambers, power generation. TBCs are used to allow higher service temperatures hot section of turbines and thus higher turbine efficiencies. TBCs generally consist of a metallic bond coating (BC) usually MCrAlY, a ceramic top coating (TC) usually ZrO2+Y2O3 and a thin oxide ceramic inter-layer (TGO) that forms under service condition within the bond coat / top coat interface. In this study, CoNiCrAlY powders were deposited on stainless steel substrate. High velocity oxy-fuel (HVOF) and Atmospheric plasma spraying (APS) techniques were used to produce two different types of bond coats. The ceramic top layers on both BC types were produced by APS. TBC specimens were subjected to heat treatment tests. Heat treatment tests was carried out in standard atmosphere at 550 °C, 650 °C and 750 °C for 1 and 2 hours. The microstructure and adhesion strength for top coat / bond coat interface of as sprayed and heat treated samples were investigated. Besides, the mechanical and microstructure behaviors of the produced layers in TBCs with heat treated and without heat treated samples were characterized and evaluated by SEM and optical microscope (OM). The results show the heat treatment of the coatings in different temperatures caused changes in microstructure and increase in adhesion strength properties of the coatings.
Lifetime Assessment and Shock Behavior of TBC in Gas Turbine Blades: Experimental and Numerical Investigations
Authors: Kahraman Yasar , Taymaz Imdat
Published: August 2023

In this study, the thermal shock behaviour of a thermal barrier coating system of a gas turbine engine’s turbine blade of the space and aircrafts are evaluated. The thermal shock behaviour of the thermal barrier coating system was investigated. Computer-assisted thermal (ANSYS) and crack growth (FCPAS) analyses were carried out with the help of the obtained information. Thermal barrier coating system consists of nickel based superalloy substrate, ytria stabilized zirconia (%8 YSZ) ceramic top coat and NiCrAlY bond coat. Plasma spray method was used for coatings. Damages that occurred in the specimens were assessed according to cycle numbers, thermal stress and heating time. With the aid of the experiments, stress analyses of the modelled TBC were performed. The crack profiles and crack progression rates were determined. Finally the coating life was determined.
Influence of the nano-structure and composition of titanium nitride based substrate on the carbon nanotubes grown by CVD
Authors: Morales Corredor Mónica , Cucatti S. , Acuuna J.J S. , Antonin O. , Hugon M.C. , Marsot N. , Bouchet-Fabre B. , Minea T. , Alvarez F.
Published: August 2023

We present a study of the influence of the substrate nano-structure and composition on the morphological properties of the carbon nanotubes (CNTs) by sequentially growing in situ TiNx:Oy film, dispersed nickel catalyst particles, and CNTs obtained by CVD. The results show that the stoichiometry and the nanostructures of the substrate intervene in the growing process. Particular attention is pay to the influence of oxygen on the CNT growths. The results show that O prevents the coarsening of the catalyst nickel particles, avoiding the surface diffusion mobility of the precursor atoms involved in the nanotubes growth (Ostwald ripening)1. The dependence of the size and density of the CNTs on the amount of O present in the substrate are reported and discussed. The experimental findings show that, besides acting as diffusion barrier between the catalyst particles and the silicon, the substrate also influences the kinetics of growth of carbon nanotubes.
Application of the dusty plasma technology for diamond ceramics production
Authors: Pal Alexander , Ekimov Evgeny , Ivanov Alexander , Borovikov Nikolay , Rusinkevich Andrey , Ryabinkin Alexey , Serov Alexander , Starostin Andrey , Fortov Vladimir , Gromnitskaya Elena
Published: August 2023

Not available
The Structure-Phase Compositions of Ni - Cr and Co–Cr Based Powder Alloys Coatings Deposited by Plasma-Detonation on Steel Substrates
Authors: Alontseva Darya L. , Pogrebnjak Alexander D. , Klassen Galina
Published: August 2023

This paper presents new results of transmission electron microscopy (TEM), X-ray diffraction (XRD) and atomic force microscopy (AFM) investigation of the structure-phase compositions of thick (150 µm) coatings on the base of Ni–Cr and Co–Cr deposited by plasma-detonation on steel substrates. The phase structures and morphology of precipitation from solid solution are defined. The microstructure model of a thick plasma detonation coating on steel substrate is developed. The main aim of carrying out these investigations is developing science based recommendations for modification of plasma-detonation coatings by plasma-jet or e-beam.
Evaluation of the PVD and CVD coatings’ structure using the modified method of spherical metallographic microsection (Baltest-M).
Authors: Betiuk Marek
Published: August 2023

The Baltest-M testing method developed at the Institute of Precision Mechanics allows a precise metallographic analysis of the structures of the coating and substrate materials subject to a strong local plastic strain. The material structure of locally strained areological systems (coating: PVD, CVD – substrate: steel, carbides) is revealed on precise spherical polished sections. The essence of this new testing method is the fact that the spherical polished sections are made in the area of indentations formed during hardness testing (HB, HRC, HV, HK of the surface) of the areological system. Material structures of substrate and coating in the indenter strain area are analysed quantitatively and qualitatively. The Kulotester test rig with a high-quality optical system, a rotary x-y bench for a sample holder and a microprocessor controller allows a precise preparation of polished sections within the indentations formed during the hardness test.
The formation of superhard coatings = 48 GPa in Ti-Hf-N (Fe) and analysis of their structure and properties.
Authors: Pogrebnjak A. D. , Ponomarev A. G. , Kaverin M. V. , Kolesnikov D. A. , Beresnev V. M. , Komarov F.F. , Mel’nik S. S.
Published: August 2023

Superhard nanostructured Ti–Hf–N(Fe) coatings are prepared. The formation of local regions of (Ti, Hf)N, FeN, and Hf is detected using µ-PIXE (ion microbeam). It is revealed that the synthesized coatings have a nanohardness of 48 ± 1 GPa and are composed of nanograins with a size of 4.8–10.6 nm, which are enveloped by finer entities of other phases (Ti, Fe)N and FeN. There is a good correlation between the results derived by XRD, TEM, AFM, and SEM and microanalysis, which in turn are complemented by the analysis results obtained using an ion microbeam and PIXE.
Study of the transition between capacitive and inductive modes on propanethiol plasma polymer properties: correlation between plasma and film chemistry
Authors: Thiry Damien , Britun Nikolay , Konstantinidis Stephanos , Dauchot Jean-Pierre , Guillaume Maxime , Cornil Jérôme , Rony Snyders Rony
Published: August 2023

Not available
Plasma deposition of hydrophobic coatings on structured surfaces for condensation and heat transfer applications
Authors: Gloess D. , Frach P. , Maicu M. , Holst E. , Schmittgens R. , Gerlach G. , Lu C.H. , Roch T. , Bieda M. , Lasagni A. , Beckmann M.
Published: August 2023

The control of vapor condensation processes by suitably prepared surfaces is a prominent research area with important applications in the industry. For example, it is well known that the efficiency of condensation heat exchangers can be significantly increased when the vapor condenses to form droplets on the surface, instead of a closed film which does not wet the surface. In the present work, hydrophobic thin films are deposited via plasma CVD processes on metallic surfaces to investigate the condensation of water vapor on these surfaces. The drop-wise condensation on the coated surfaces is analyzed by optical microscopy and the effect on the heat transfer is measured by heat flux measurements. In order to show the potential of the deposition process for industrial applications and to investigate the effect of drop-wise condensation on heat transfer, copper (Cu) substrates were coated with a plasma polymer film using an organosilicon monomer (Hexamethyldisiloxane, HMDSO) as a precursor. In addition, the effect of surface roughness on the drop-wise condensation is presented because the static contact angle of water on hydrophobic surfaces depends strongly on surface topography.
High Power Density Pulse Magnetron Sputtering - Process and Film Properties
Authors: Frach Peter , Gottfried Christian , Fietzke Fred , Klostermann Heidrun , Bartzsch Hagen , Gloess Daniel
Published: August 2023

In this paper specific advantages and disadvantages of different pulse magnetron sputtering processes (unipolar and bipolar pulse sputtering at high and very high power density including HIPIMS) as well as current and potential fields of application will be discussed.
The Effect of Nitrogen Partial Pressure and Substrate Temperature on the Characteristics of Photocatalytic N:TiO2 Thin Films deposited by Filtered Vacuum Arc Deposition
Authors: Goldenberg Eda , Burstein L. , Chayun-Zucker Ines , Avni Rudi , Boxman Raymond L.
Published: August 2023

Nitrogen doped Titanium Oxide (N:TiO2) thin films were deposited using filtered vacuum arc deposition, and their structure, composition and morphology were studied as functions of the total pressure, N2/O2 gas ratio and the substrate temperature. The film structure, surface morphology, and composition were determined by XRD, AFM and XPS. The optical characterization of the films was determined with spectrophotomery and ex-situ variable angle spectroscopic ellipsometry (VASE). In addition to the effects of other deposition conditions such as arc current, total deposition pressure, and post-deposition annealing on the film characteristics, photocatalytic activity was also determined as a function of deposition parameters and results were discussed.
A brief update on the controversial and opposing roles of Pseudomonas aeruginosa efflux pumps in virulence regulation
Authors: Fernandes Sheryl Erica , Jorth Peter
Published: August 2023

Pseudomonas aeruginosa is highly adaptable and constantly mutates to resist natural and synthetic antibiotic stresses. Listed as a serious threat by the Centers for Disease Control, novel antimicrobials are urgently needed for drug resistant P. aeruginosa infections. Multidrug efflux pumps which contribute to antibiotic resistance are genetically encoded, highly conserved, and have evolved long before the rampant clinical use of antibiotics. Hence, efflux pumps may have been selected for functions beyond the mere exclusion of antibiotics. In this review, we discuss recent updates and controversies surrounding how alternative functions of multidrug efflux pumps can influence the virulence of P. aeruginosa. We conclude by highlighting unexpected consequences of targeting efflux pumps with therapies, including potential risks and benefits. Understanding these consequences will be critical to the development of successful therapeutic strategies that consider aspects of both antimicrobial resistance and bacterial pathogenesis.
Contemporary European practice in transcatheter aortic valve implantation: results from the 2022 European TAVI Pathway Registry
Authors: Rosseel Liesbeth , Mylotte Darren , Cosyns Bernard , Vanhaverbeke Maarten , Zweiker David , Teles Rui Campante , Angerås Oskar , Neylon Antoinette , Rudolph Tanja Katharina , Wykrzykowska Joanna J. , Patterson Tiffany , Costa Giulia , Ojeda Soledad , Tzikas Apostolos , Abras Marcel , Leroux Lionel , Van Belle Eric , Tchétché Didier , Bleiziffer Sabine , Swaans Martin J. , Parma Radoslaw , Blackman Daniel J. , Van Mieghem Nicolas M. , Grygier Marek , Redwood Simon , Prendergast Bernard , Van Camp Guy , De Backer Ole
Published: August 2023

Background

A steep rise in the use of transcatheter aortic valve implantation (TAVI) for the management of symptomatic severe aortic stenosis occurred. Minimalist TAVI procedures and streamlined patient pathways within experienced Heart Valve Centres are designed to overcome the challenges of ever-increasing procedural volume.

Aims

The 2022 European TAVI Pathway Survey aims to describe contemporary TAVI practice across Europe.

Materials and methods

Between October and December 2022, TAVI operators from 32 European countries were invited to complete an online questionnaire regarding their current practice.

Results

Responses were available from 147 TAVI centres in 26 countries. In 2021, the participating centres performed a total number of 27,223 TAVI procedures, with a mean of 185 TAVI cases per centre (median 138; IQR 77–194). Treatment strategies are usually (87%) discussed at a dedicated Heart Team meeting. Transfemoral TAVI is performed with local anaesthesia only (33%), with associated conscious sedation (60%), or under general anaesthesia (7%). Primary vascular access is percutaneous transfemoral (99%) with secondary radial access (52%). After uncomplicated TAVI, patients are transferred to a high-, medium-, or low-care unit in 28%, 52%, and 20% of cases, respectively. Time to discharge is day 1 (12%), day 2 (31%), day 3 (29%), or day 4 or more (28%).

Conclusion

Reported adoption of minimalist TAVI techniques is common among European TAVI centres, but rates of next-day discharge remain low. This survey highlights the significant progress made in refining TAVI treatment and pathways in recent years and identifies possible areas for further improvement.
Case report: Unusual cause of refractory hypoxemia after pacemaker lead extraction
Authors: Zhou Jingliang , He Jinshan , Duan Jiangbo , Li Xuebin
Published: August 2023

A 59-year-old woman with a history of a pacemaker implanted for III-degree atrioventricular block was admitted due to pocket infection. The atrial and ventricular leads were removed via the right femoral vein using a needle's eye snare. Hypoxemia was observed immediately after the removal of the lead. It was refractory to oxygen therapy. The pulse oxygen saturation (SpO2) showed 89% in the supine position and 77% in the upright position. However, the CTPA and pulmonary perfusion SPECT/CT imaging did not reveal any signs of pulmonary embolism. Pulmonary function tests and chest CT showed normal results. Transthoracic contrast echocardiography revealed a patent foramen ovale (PFO) and a right-to-left intracardiac shunt, no significant tricuspid regurgitation, without any signs of elevated right heart pressure or pulmonary hypertension. Hypoxemia was considered to be associated with the right-to-left shunt through PFO. The condition was relieved by percutaneous closure of the PFO. Refractory hypoxemia resulting from an intracardiac right-to-left shunt following pacemaker lead extraction is a rare but serious complication. Transthoracic contrast echocardiography helps in diagnosis. If the right-to-left intracardiac shunt through PFO persists irreversibly and the associated hypoxemic symptoms are significant, closure of the PFO is necessary. Transesophageal echocardiography also revealed the presence of a left-to-right shunt through PFO during cardiac systole. The closure of the PFO is also necessary to avoid long-term complications, such as chronic pulmonary hypertension and right heart failure.
‘I can’t say that anything has changed’: parents of autistic young people (16–25 years) discuss the impact of the Children and Families Act in England and Wales
Authors: Crane Laura , Davies Jade , Fritz Anne , Portman Kerrie , O’Brien Sarah , Worsley Alison , Remington Anna
Published: August 2023

Introduction

In 2014, changes to special educational needs and disability (SEND) legislation were introduced in England and Wales. These reforms aimed for young people and their families to receive the help and support they need, have a say regarding their support needs, and achieve better outcomes.

Methods

We examine the views of parents of autistic young people (16–25 years) regarding the impact of the reforms, several years after their introduction. In total, 115 parents of autistic young people (16–25 years) in England and Wales took part in our research: 84 completed an online survey, one took part in an interview, and 30 participated in both the survey and interview. Quantitative data, collected via the online survey, were analyzed descriptively. Qualitative data, collected via the survey and interview, were analyzed using inductive thematic analysis.

Results

Parents overwhelmingly reported that their experiences had not improved since the introduction of the SEND reforms. This experience impacted their own, and their children’s, wellbeing. Parents felt that the reforms were simply delaying the inevitable, and there was still limited support for them or their children as they transitioned to adulthood.

Discussion

Despite promises of a radically different system, and the potential of these reforms, parents reported that little had changed for them or their children since the introduction of the Children and Families Act.
The diagnostic effectiveness of serum sialic acid predicts both qualitative and quantitative prostate cancer in patients with prostate-specific antigen between 4 and 20 ng/mL
Authors: Sun Jingtao , Yan Lei
Published: August 2023

Introduction

This study aimed to evaluate the predictive value of the serum biochemical index, including alkaline phosphatase (AKP), lactate dehydrogenase (LDH), α-L-fucosidase (AFU), serum sialic acid (SA), and fibrinogen (FIB), for prostate cancer (PCa) and clinically significant prostate cancer (CSPCa) in patients with a prostate-specific antigen (PSA) value between 4 and 20 ng/mL.

Patients and methods

This study retrospectively examined the clinical data of 408 eligible patients who underwent prostate biopsies in our hospital between March 2015 and July 2022. CSPCa was defined as a “Gleason grade group of≥2”. For analyzing the association between PCa/CSPCa and serum biochemical index, univariable logistic regression and multivariable logistic regression were conducted. Based on the multivariable logistic regression model, we constructed models and compared the area under the curve (AUC). We generated the nomogram, the ROC curve, the DCA curve, and the calibration curve for PCa.

Results

Overall, we studied 271 patients with PCa (including 155 patients with CSPCa) and 137 non-PCa patients. Patients with PCa were more likely to consume alcohol, have higher total PSA (TPSA) values, and have lower free PSA (FPSA) and free/total PSA (f/T) values. There were higher TPSA values and lower f/T values in the CSPCa group when compared with the non-CSPCa group. The univariate logistic regression analyses did not show significant results. However, AKP, AFU, SA, TPSA, and FPSA all retain significant significance when all factors are included in multifactor logistic regression analysis. This finding suggests that the exposure factor exhibited an independent effect on the outcome after controlling for other factors, including the potential confounding effects that may have been underestimated. Through ROC curves, we found that SA and TPSA levels are more powerful predictors. In contrast, there is a lack of excellent predictive value for PCA and CSPCa using Age, AFU, FIB, and FPSA.

Conclusion

In our study, serum biochemical index is a potential prediction tool for PCa and CSPCa for patients with PSA values between 4 and 20 ng/mL. Additionally, the new serum biochemical index SA is also useful when diagnosing PCa and CSPCa, as we conclude in our study.
Association of hypoglycaemia with the risks of arrhythmia and mortality in individuals with diabetes - a systematic review and meta-analysis
Authors: Li Gangfeng , Zhong Shuping , Wang Xingmu , Zhuge Fuyuan
Published: August 2023

Background

Hypoglycaemia has been linked to an increased risk of cardiac arrhythmias by causing autonomic and metabolic alterations, which may be associated with detrimental outcomes in individuals with diabetes(IWD), such as cardiovascular diseases (CVDs) and mortality, especially in multimorbid or frail people. However, such relationships in this population have not been thoroughly investigated. For this reason, we conducted a systematic review and meta-analysis.

Methods

Relevant papers published on PubMed, Embase, Cochrane, Web of Knowledge, Scopus, and CINHAL complete from inception to December 22, 2022 were routinely searched without regard for language. All of the selected articles included odds ratio, hazard ratio, or relative risk statistics, as well as data for estimating the connection of hypoglycaemia with cardiac arrhythmia, CVD-induced death, or total death in IWD. Regardless of the heterogeneity assessed by the I2 statistic, pooled relative risks (RRs) and 95% confidence intervals (CI) were obtained using random-effects models.

Results

After deleting duplicates and closely evaluating all screened citations, we chose 60 studies with totally 5,960,224 participants for this analysis. Fourteen studies were included in the arrhythmia risk analysis, and 50 in the analysis of all-cause mortality. Hypoglycaemic patients had significantly higher risks of arrhythmia occurrence (RR 1.42, 95%CI 1.21-1.68), CVD-induced death (RR 1.59, 95% CI 1.24-2.04), and all-cause mortality (RR 1.68, 95% CI 1.49-1.90) compared to euglycaemic patients with significant heterogeneity.

Conclusion

Hypoglycaemic individuals are more susceptible to develop cardiac arrhythmias and die, but evidence of potential causal linkages beyond statistical associations must await proof by additional specifically well planned research that controls for all potential remaining confounding factors.