bluuebunny/crossref_metadata_2025 huggingface dataset:
Öz Eleştiriye Çok Boyutlu Yaklaşım: Öz Eleştiri Ölçeğinin Geliştirilmesi ve Psikometrik Özelliklerinin İncelenmesi
Authors: YILMAZTÜRK Mücahit , EKŞİ Halil
Published: September 2022

Bu araştırmanın amacı, yetişkin bireylerin öz eleştiri düzeylerini belirlemeye yönelik bir ölçek geliştirmek ve psikometrik özelliklerini incelemektir. Nicel araştırma yöntemlerinin kullanıldığı bu çalışma 675 yetişkin (18-61 yaş) birey ile gerçekleştirilmiştir (xort: 25,95; xss: 6,91). Toplanan veriler, SPSS 25 ve AMOS 24 istatistik programları ile analiz edilmiştir. Çalışma sonucunda 30 madde ve 3 alt boyuttan oluşan “Öz Eleştiri Ölçeği” elde edilmiştir. Yapılan açımlayıcı faktör analizi sonucuna göre üç faktörlü yapı toplam varyansın %48,93’ünü açıklamaktadır. Güvenirlik çalışmaları doğrultusunda yapılan analizde ölçeğin Cronbach’s alpha iç tutarlık katsayısı yıkıcı öz eleştiri alt boyutu için ,910 yapıcı öz eleştiri alt boyutu için ,884 ve yetersiz öz eleştiri alt boyutu için ,806 olarak belirlenmiştir. Ölçek maddelerinin ayırt ediciliğini belirlemek üzere yapılan bağımsız gruplar t testi sonucunda tüm ölçek maddeleri için alt ve üst gruplar arasında anlamlı bir farklılık bulunmuştur (p
Üniversiteye Giriş Sınavı Günü: Öğrencilerin Yaşadığı Korkular ve Anne-Babalarının Çocuklarına Söyledikleri
Authors: ATLİ Abdullah , GÜR Sertan Hamza
Published: September 2022

Bu araştırmanın amacı, lise son sınıf öğrencilerinin üniversiteye giriş sınavı günü yaşadıkları korkuları ve anne-babalarının çocuklarını rahatlatmak söyledikleri sözlerin neler olduğunu keşfetmektir. Malatya ilinde farklı liselerde okuyan 62 son sınıf öğrencisinden elde edilen nitel verilerin içerik analizi sonucunda, öğrencilerin sınav gününe dair en büyük korkularının: “yüksek kaygı ve fizyolojik ihtiyaçlar”, “sınava geç kalma ya da girememe”, “sevdiklerinin başına kötü bir şey gelmesi” ve “sınavın kötü geçmesi” olduğu görülmüştür. Anne-babaların, sınav günü çocuklarını rahatlatmak için: “sana inanıyorum, yapabilirsin”, “rahat ol, stres yapma”, “dünyanın sonu değil, olmadı bir daha denersin”, “elinden gelenin en iyisini yapmaya çalış” şeklinde sözler kullandıkları görülmüştür. Anne-babaların kullandıkları bu sözlerin, öğrencilerin büyük bir kısmını olumlu yönde etkilediği görülmüştür. Araştırmadan elde edilen bulgular ışığında anne-babalara, okul psikolojik danışmanlarına ve diğer uygulamacılara çeşitli önerilerde bulunulmuştur.
9. Sınıf Müzik Dersi İçin Tasarlanmış Materyallerin Öğrencilerin Akademik Başarı Düzeylerine Etkisi
Authors: PEKDEMİR Ebru , ULUDAĞ Ali Korkut
Published: September 2022

Bu araştırmada, temel müzik teorisi konularını öğretmek üzere tasarlanmış olan oyun içerikli materyallerin öğrencilerin başarı düzeyleri üzerinde ki etkisi incelenmiştir. Bu materyaller, 2018-2019 eğitim- öğretim yılında öğrenim gören Atatürk Üniversitesi Müzik Eğitimi Anabilim Dalı 3. Sınıf öğrencileri tarafından öğretim teknolojileri ve materyal tasarımı dersinde hazırlanmıştır. Nicel araştırma yöntemiyle tasarlanan bu araştırmanın deseninde solomon dört gruplu model kullanılmıştır. Deneysel prosedür öncesinde random tekniğiyle kontrol ve deney grupları belirlenmiştir. Deneysel prosedür 9 aşamadan oluşmuş ve her aşamada farklı bir materyal kullanılmıştır. Çalışma grubu, 2018-2019 eğitim-öğretim yılında Muş Anadolu Lisesi 9. Sınıf seviyesinde öğrenim görmüş öğrencilerden oluşturulmuştur (n=120). Deney grupları 9/A ve 9/C sınıflarındaki öğrenciler (n=30+30), kontrol grupları ise 9/B ve 9/D sınıflarındaki öğrenciler (n=30+30) tarafından oluşturmuştur. Veri toplama aracı olarak araştırmacılar tarafından uzman görüşleri doğrultusunda hazırlanan ve 20 maddeden oluşan “Temel Müzik Teorisi Başarı Testi” kullanılmıştır. Geçerlik ve güvenirlik analizi için puanlayıcılar arasında Cohen Kappa katsayısı belirlenmiştir. Verilerin analizinde ise Mann-Whitney U Testi kullanılmıştır. Deney ve kontrol gruplarının deneysel prosedür öncesinde ki puanları arasında anlamlı bir fark oluşmamış, ulaşılan veriler homojen bir dağılım göstermiştir. Deney 1-2 ve kontrol 1-2 grubu ile sontest aşamasında ortaya çıkan t testi sonuçları ise deneysel prosedürün uygulandığı grubun daha yüksek puanlara ulaştığını göstermiştir. Bu araştırmanın sonuçlarına dayanarak, oyun içerikli materyallerle sistematik bir şekilde hazırlanmış müzik dersi aktivitelerinin akademik başarıyı artırdığı görülmüştür.
Classification of the types of the information security as a legal category
Authors:   Taras Shevchenko National University of Kyiv, Onopriienko S.
Published: September 2022

The purpose of the article was to propose a classification of types of information security from the analysis of theoretical sources and legislative practice. The article substantiates that information security as a scientific legal definition can be considered in two aspects: broad and narrow. In a broad aspect, information security is a set of legal acts, bodies authorized by them, organization and practice of the latter, the combination of which generates a mechanism for ensuring and protecting the information rights and interests of a person, social groups, civil society institutions, subjects of economic relations, public authorities. and military formations. In a narrow aspect, information security is the state of maximum protection of a person, society and the state from information threats. Arguments are given that, in a broad aspect, information security can be classified: a) by the source of origin of the authority to implement measures to ensure information security (natural human rights and freedoms, the Constitution of Ukraine, laws of Ukraine, by-laws); b) by types of entities providing information security (individual and citizen, civil society institutions, state authorities, local governments, military formations, enterprises, institutions and organizations of all forms of ownership); c) according to the degree of obligation to implement measures to ensure information security: the main one (for specially authorized public authorities and military formations); optional (for other public authorities); delegated (for enterprises, institutions and organizations to which the authority to implement information security measures is delegated by the relevant legal acts; optional (for citizens and civil society entities). The article substantiates that in a narrow aspect, information security includes the following types: a) according to the criterion of subjects covered by information security measures (information security of a person, corporations, civil society and the state); b) according to the criterion of information threats (political information security, military information security, economic information security, environmental information security, etc.); c) according to the criterion of achieved results (perfect and imperfect information security).
Depo antipsikotik kullanan hastalarda prolaktin düzeyi, cinsel fonksiyon, vücut kitle indeksi ve karaciğer fonksiyon testlerinin karşılaştırılması
Authors: TAŞCI Gülay , ÖZSOY Filiz
Published: September 2022

Amaç: Bu çalışmada uzun etkili antipsikotik ilaç formları (uzun etkili paliperidon palmitat, risperidon depo ve zuklopentiksol depo) kullanan hastalarda cinsel işlev bozuklukları, vücut kitle indeksi, karaciğer fonksiyon testleri ve prolaktin düzeylerinin karşılaştırılması amaçlanmıştır.

Gereç ve Yöntem: Bu çalışmaya şizofreni tanılı ve uzun etkili antipsikotik tedavisi alan hastalar dahil edildi. Tüm katılımcılara demografik veri formu, Pozitif ve Negatif Sendrom Ölçeği (PANSS), Calgary Şizofrenide Depresyon Ölçeği (CŞDÖ) ve Arizona Cinsel Yaşantılar Ölçeği (ACYÖ) uygulandı. Ardından üre, kreatinin, karaciğer fonksiyon testleri, kolesterol ve prolaktin düzeylerini değerlendirmek için venöz kan örnekleri alındı.

Bulgular: Çalışmaya 95 hasta dahil edildi. Dahil edilenlerin 79’u erkek (%83.2) ve 16’sı kadındı (%16.8). Tüm hastaların yaş ortalaması 36.77±10.24 yıl idi. Vücut kitle indeksleri ortalaması ise 27.06±4.95 kg/m2 idi. Gruplar arasında ACYÖ ve CŞDÖ skorları açısından farklılık saptanmadı. Prolaktin değeri paliperidon depo kullanan hastalarda zuklopentiksol depo kullanan hastalardan yüksek olarak hesap edilmiştir.

Sonuç: Sonuçlarımıza göre cinsel işlevleri etkileyen prolaktin değerleri, hastalar semptom belirtmese de uzun etkili antipsikotik kullanan hastalarda göz önünde bulundurulmalıdır. Uzun etkili antipsikotik kullanımının hem prolaktin değerleri hem de diğer laboratuvar parametrelerine olan etkileri konusunda ileri araştırmalar yapılmalıdır.
Relationship between the Achilles tendon strain ratio and the presence of mitral annulus calcification
Authors: ÇAKIR PEKÖZ Burçak , YILDIRIM Arafat
Published: September 2022

Purpose: We aimed to investigate the significance of Achilles tendon (AT) thickness (T) and AT strain ratio (SR), determined by AT ultrasonography (US) and strain elastography (SE), in determining patients with mitral annulus calcification (MAC).

Materials and Methods: 100 patients (65 females, 35 males, mean age 64.7 ± 12.1 years) diagnosed with MAC after echocardiography and 50 control subjects (32 females, 18 males, mean age 63.2 ± 12.8 years) with similar cardiovascular risk factors were included. Laboratory tests and AT US were performed. AT T and AT-SR were calculated.

Results: AT -T and AT-SR were found to be significantly higher in patients with MAC. In multivariate logistic regression analysis, AT -T and AT-SR independently determined the risk for MAC. According to this analysis, AT -T (1 mm each) and AT-SR (0.1 each) increased the risk for MAC by 69.9% and 12.7%, respectively. When ROC was analyzed using AT -T and AT-SR to predict patients with MAC, the areas under the curve (AUC) of ROC were 0.684 and 0.819, respectively. In the same analysis accepting the cut-off value of 1.25 for AT-SR, the presence of MAC was detected with a sensitivity of 94.1% and a specificity of 76.2%.

Conclusion: AT-SR detected in AT SE examination is a simple, reproducible, inexpensive, and noninvasive parameter that can be used to predict patients with MAC. This may be due to the fact that the increase in MAC and AT-SR may be associated with similar physiopathological mechanisms.
Burnout among healthcare workers at the first wave of the COVID-19: meta analysis
Authors: YÜCEL KARAKAYA Sevinç Püren , SEYDAOĞLU Gülşah , TOTİK DOĞAN Nazlı , BOZ Aslı , CANDANSAYAR Selçuk
Published: September 2022

conditions during the COVID-19 pandemic, threaten the lives and physical well-being of healthcare workers (HCWs), and also their mental health, such as burnout, etc. which is often neglected. The aim of this review is to analyze published studies on the proportion of burnout among HCWs during the first wave of the COVID-19.

Materials and Methods: We conducted a systematic review of studies that reported burnout (measured by Maslach Burnout Inventory) among HCWs during the COVID-19 pandemic and searched PubMed, PsycINFO, and WOS of relevant articles up to Feb 25th, 2021. Out of 145 non-duplicate studies, 10 were included in the meta-analysis.

Results: The overall estimated pooled proportion for emotional exhaustion (EE) was 31% (95% CI: 24%-40%), for depersonalization (DP) was 28% (95% CI: 23%-38%) and 22% (95% CI: 13%-34%) for personal accomplishment (PA). The results show that in countries where the number of cases is high and the number of beds and doctors is low, the level of EE appears to be slightly lower and PA is slightly higher. However, there were no significant differences according to subgroup analyses.

Conclusion: Evidence from early studies highlight the fact that a significant proportion of HCWs suffers from burnout during this pandemic. It will be necessary to pay close attention to HCWs' mental health and identify ways to reduce risks and prepare a rehabilitation program for the HCWs during and after the pandemic.
Investigation of the effect of gossypin on MMP-2 and MMP-9 genes in prostate cancer cells
Authors: DİRİCAN Ebubekir , ÇINAR İrfan
Published: September 2022

Purpose: The aim of this study is to explore the effects of gossypin on matrix metalloproteinases -2 (MMP-2) and MMP-9 genes in prostate cancer cells. Materials and Methods: PC3 cells were grown in culture and treated with three different concentrations of gossypin (25-50-100 µg/ml) and cisplatin (50 µM) as a positive control. First, RNA isolation was performed. Then, cDNA synthesis was performed and RT-PCR was used to evaluate mRNA expression levels of MMP-2 and MMP-9 genes.Results: Gossypin decreased MMP-2 and MMP-9 mRNA expression in prostate cancer cells in a concentration-dependent manner. Three concentrations (25-50-100 µg/ml) of gossypin in PC3 cells reduced the mRNA expression of the MMP-2 gene. While the fold change value of MMP-2 gene expression was 0.3482 ± 0.040 in the 100 µg/ml gossypin group, it was 1.007 ± 0.1425 in the control group. In addition, 50 µg/ml and 100 µg/ml concentrations of gossypin decreased the mRNA expression of the MMP-9 gene. The expression level of the MMP-9 gene in prostate cancer cells was 0.4740 ± 0.038 in the 100 µg/ml gossypin administered group, while it was 1.009 ± 0.1687 in the control group. There was a positive correlation between the expressions of the MMP-2 and MMP-9 genes.Conclusion: According to the results obtained, it is seen that gossypin reduces the expression of MMP-2 and MMP-9 genes in prostate cancer cells and the effects of gossypin on other genetic and epigenetic mechanisms in cancer need to be investigated to reveal the anti-cancer.
Amplification and Attenuation Due to Geologic Conditions in the Sichuan Basin, Central China
Authors: Guo Zhen , Guan Mingle , Chapman Martin C.
Published: September 2022

The Sichuan basin is an intracontinental basin in central China containing extensive Paleozoic, Mesozoic, and Cenozoic sedimentary sequences of varying thicknesses. We used seismic recordings from 189 regional earthquakes with magnitude Ms 4.0–7.0 occurring from 2010 to 2020 recorded by 22 stations from the China Digital Seismological Observation Network to estimate the kappa values (κ0) in the Sichuan basin using Lg waves and coda waves. The Lg and coda κ0 values agree well with each other and show positive correlation with the thickness of sediments in the basin. The average κ0 for the Sichuan basin is estimated as 0.0475 s, similar to results reported in previous studies. The average estimate of κ0 is 0.06 s for stations in the western part of the basin that are underlain by sediments approximately 8 km thick. The quality factor Q of Lg waves in the crustal waveguide is estimated as Q(f)=335f0.72. We estimated site response in the Sichuan basin from Lg spectral inversion, coda spectral ratios, and Lg horizontal to vertical spectral ratios, respectively, and investigated correlation between the site response values and sediment thickness. Consistent patterns are observed in the three sets of site response, which are clearly dependent on the thickness of sediments. Maximum averaged amplification factors of the sediments occur around 2–4 Hz reaching ∼4.5 for sites overlying 8 km sediments. Stronger attenuation effects are observed at stations lying on thicker sediment columns at frequencies higher than 9.66 Hz. This spatial dependence of low-frequency amplification and high-frequency attenuation should be incorporated in ground-motion prediction models for the Sichuan basin. The results of this study can be applied to sites in the Sichuan basin where the thickness of the sedimentary section exceeds 2 km.
Viscoelastic Fault-Based Model of Crustal Deformation for the 2023 Update to the U.S. National Seismic Hazard Model
Authors: Pollitz Fred F.
Published: September 2022

The 2023 update to the National Seismic Hazard (NSHM) model is informed by several deformation models that furnish geodetically estimated fault slip rates. Here I describe a fault-based model that permits estimation of long-term slip rates on discrete faults and the distribution of off-fault moment release. It is based on quantification of the earthquake cycle on a viscoelastic model of the seismogenic upper crust and ductile lower crust and mantle. I apply it to a large dataset of horizontal and vertical Global Positioning System (GPS) interseismic velocities in the western United States, resulting in long-term slip rates on more than 1000 active faults defined for the NSHM. A reasonable fit to the GPS dataset is achieved with a set of slip rates designed to lie strictly within a priori geologic slip rate bounds. Time-dependent effects implemented via a “ghost transient” have a profound effect on slip rate estimation and tend to raise calculated slip rates along the northern and southern San Andreas fault by up to several mm/yr.
NeoKinema Deformation Model for the 2023 Update to the U.S. National Seismic Hazard Model
Authors: Shen Zheng-Kang , Bird Peter
Published: September 2022

We develop a crustal deformation model of the western conterminous United States for the 2023 update of the National Seismic Hazard Model (NSHM). The kinematic finite-element code NeoKinema is used to describe crustal deformation, including long-term slip on faults and off-fault strains (both elastic and permanent). Three different data sets—Global Positioning System (GPS) velocities, geological fault offset rates, and crustal stress orientations—are used to constrain the model, and the plate tectonic rotation of Pacific relative to North America is also imposed on some boundaries. Compared to the last NSHM model update in 2014, the GPS and geological fault data are substantially updated, and new corrections are implemented in both the data and modeling approach, including the correction of the “ghost transient” effect due to postseismic deformation following large historic earthquakes, and correction for shallow creep on faults estimated from independent data. Based on these modeling results and a plate tectonic model of the Cascadia subduction zone, a long-term seismicity rate map is also computed for the western United States; this map is independent of the local seismic catalog and can, therefore, be tested retrospectively as well as prospectively. We find good success in most of the region, except in Cascadia, where the 45 yr instrumental seismicity record is much quieter than the forecast of our long-term model.
THEORETICAL STUDY OF NONLINEAR CHATTER STABILITY ANALYSIS BASED ON SYNTHESIS OF LINEARIZATIONS IN OPERATING POINTS FOR DIFFERENT TURNING CONDITIONS
Authors:   Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czechia, HADRABA PETR , WANG JIUNN-JYH ,   National Cheng Kung University, Department of Mechanical Engineering, Tainan, Taiwan, LIN HUEI-MIN ,   National Cheng Kung University, Department of Mechanical Engineering, Tainan, Taiwan, HADAS ZDENEK ,   Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czechia
Published: September 2022

This paper deals with an approach to study nonlinear chatter analysis, which is based on the synthesis of linear theory for different turning conditions. Mainly, contact nonlinearities play a crucial role in the behavior of the machine tool and the stability of turning operation. However, the analysis of nonlinear systems is challenging because nonlinear system analyzes are often limited to a linearized solution, which may be insufficient to reveal the stability lobe diagram. The presented study proposes a theoretical approach which is based on a synthesis of linearization in the operating point. This approach provides several solutions of stability lobe diagrams which are strongly depending on the loading conditions of the nonlinear system and all solutions are integrated to the final stability lobe diagram. The presented method is applied to a simplified 2D structure between two supports with nonlinear contact stiffness. Resulted analysis of the lobe diagram are compared with results of the time-domine simulations and it shows a good match. This paper shows that the presented approach offers an effective solution for refining the stability estimate for nonlinear mechanical systems.
INFLUENCE OF HEAT ACCUMULATION OF THE OBJECT ON THE OPERATION OF THE COOLED CEILINGS COOLING SYSTEM
Authors:   Technical University of Kosice, Presov, Slovak Republic, RIMAR MIROSLAV , FEDAK MARCEL ,   Technical University of Kosice, Presov, Slovak Republic, KULIKOV ANDRII ,   Technical University of Kosice, Presov, Slovak Republic, KRENICKY TIBOR ,   Technical University of Kosice, Presov, Slovak Republic, KULIKOVA OLHA ,   Technical University of Kosice, Presov, Slovak Republic
Published: September 2022

The application of cooling systems is a relatively efficient way to ensure the required thermal comfort conditions. One option is the application of cooled ceilings, where the heat load is removed using a ceiling structure with integrated cooling panels. These systems allow for a suitable way remove the heat load, but at the same time, compared to conventional air conditioning systems, they are characterized by a certain time dependence. The presented article describes experimental measurements carried out on days with high exterior heat exposure. Measurements evaluating the effect of the phase shift of temperature oscillations on the operation of the system were carried out using two cooling operating modes. According to results, it can be concluded that cooling systems based on cooling ceilings can be used effectively even with high external heat gains.
ANALYSIS OF THE HEAVY METALS CONCENTRATION IN THE SOLID ALTERNATIVE FUEL ON BIOMASS BASIS
Authors:   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Presov, Slovak Republic, RIMAR MIROSLAV , KULIKOVA OLHA ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Presov, Slovak Republic, KULIKOV ANDRII ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Presov, Slovak Republic, FEDAK MARCEL ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Presov, Slovak Republic, KRENICKY TIBOR ,   Technical University of Kosice, Faculty of Manufacturing Technologies with a seat in Presov, Presov, Slovak Republic
Published: September 2022

Sustainable development requires the research on new energy sources that will be safe and at the same time help to solve other societal problems. The paper is focusing on the analysing the heavy metals concentration of biomass and fuel mixtures of biomass and municipal solid waste. Analysis confirmed that the co-combustion of dirty fuels and biomass reduced the risk of releasing minerals and heavy metals from fuel into the natural environment. At a waste concentration of 20%, almost all heavy metals have passed from fuel to ash. Based on the experiment results and measurements, it can be stated that the co-combustion of biomass and municipal solid waste is a possible energy source that will significantly support sustainable energy development, but it is necessary to control the heavy metals concentrations during the whole process.
STUDY OF FACTORS INFLUENCING VIBROISOLATING PROPERTIES OF MATERIALS FOR PASSIVE ELASTIC BEARING OF MACHINES
Authors:   Department of Hydromechanics and Hydraulic Equipment, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, Czech Republic, VASINA MARTIN , POSCHL MAREK ,   Centre of Polymer Systems, Tomas Bata University in Zlin, Czech Republic, HRUZIK LUMIR ,   Department of Hydromechanics and Hydraulic Equipment, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, Czech Republic, BURECEK ADAM ,   Department of Hydromechanics and Hydraulic Equipment, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, Czech Republic, KOTRASOVA KAMILA ,   Department of Structural Mechanics, Institute of Structural Engineering, Technical University of Kosice, Slovakia, KORMANIKOVA EVA ,   Department of Structural Mechanics, Institute of Structural Engineering, Technical University of Kosice, Slovakia
Published: September 2022

Machinery or instruments are subjected to external forces from a base in many cases. It can have a negative influence on manufacturing accuracy, tightness, wear of machine parts, work safety etc. Therefore, it is necessary to perform suitable passive elastic bearings of machinery to eliminate external vibration from the base. An application of suitable vibroisolating materials is one way of the vibration elimination. The aim of the paper is to study vibration damping properties of different materials by means of a non-destructive method of forced mechanical oscillations. Different factors influencing transfer damping of mechanical vibration were investigated in this work, e.g., material type and its thickness, excitation frequency of mechanical oscillations, size of mass load and effect of material composition. These factors were subsequently evaluated. Finally, suitable recommendations for passive damping of mechanical vibration were described.
MOUNTING FOAMS: MAKING OF SPECIMENS AND MECHANICAL TESTING
Authors:   Department of Applied Mechanics, Faculty of Mechanical Engineering, Ostrava-Poruba, Czech Republic, PASKA ZBYNEK , ROJICEK JAROSLAV ,   Department of Applied Mechanics, Faculty of Mechanical Engineering, Ostrava-Poruba, Czech Republic, FUSEK MARTIN ,   Department of Applied Mechanics, Faculty of Mechanical Engineering, Ostrava-Poruba, Czech Republic, FOJTIK FRANTISEK ,   Department of Applied Mechanics, Faculty of Mechanical Engineering, Ostrava-Poruba, Czech Republic, LICKOVA DAGMAR ,   Department of Applied Mechanics, Faculty of Mechanical Engineering, Ostrava-Poruba, Czech Republic, CIENCIALA JAKUB ,   Department of Applied Mechanics, Faculty of Mechanical Engineering, Ostrava-Poruba, Czech Republic
Published: September 2022

The article deals with the design of the technology of production of polyurethane foam (PU) specimens and with their mechanical testing. A simple procedure is proposed to produce specimens with complex shapes. The procedure is tested on two different mounting foams. These specimens were subjected to several experiments. The article presents experimental results for only one mounting foam. The tests were performed on a Testometric M500-50CT testing machine. Specifically, these are a tensile/compression test, a 3-point bending test, a shear test, and a modified indentation test. For each specimen, the displacement was also measured in the selected area with Digital Image Correlation Method. These measured data are presented in the article.
STRATEGY FOR IMPLEMENTATING PREDICTIVE PROCESS-ORIENTED MACHINE TOOL DIGITAL TWINS
Authors:   Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Production Machines and Equipment, Research Centre of Manufacturing Technology, Prague, Czech Republic, SULITKA MATEJ , KOLAR PETR ,   Czech Technical University in Prague, Czech Institute of Informatics, Robotics and Cybernetics, Department of Industrial Production and Automation, Prague, Czech Republic, SVEDA JIRI ,   Czech Technical University in Prague, Czech Institute of Informatics, Robotics and Cybernetics, Department of Industrial Production and Automation, Prague, Czech Republic, SMOLIK JAN ,   Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Production Machines and Equipment, Research Centre of Manufacturing Technology, Prague, Czech Republic
Published: September 2022

Process planning for the productive machining of complex shaped parts is a comprehensive activity where the dynamic behaviour of a machine tool, workpiece and the process setting has to be taken into account. The predictive process-oriented machine tool digital twin is a digital simulation tool enabling full control of the process results with respect to the adjustment of the whole machining system and the machining process. The paper defines and describes four different levels of such a digital twin according to its complexity. An overview of key elements and modelling techniques employed for creating the process digital twins is provided. The strategy for implementing the process digital twin as an enhancement of the NC machining process planning chain is presented. Selected use cases in the field of mould machining or thin walled blade machining are used for the method demonstrated.
LASER MACROPOLISHING OF ADDITIVELY MANUFACTURED PARTS OF MARAGING STEEL WITH RESPECT TO SURFACE PROPERTIES
Authors:   Regional Technological Institute, University of West Bohemia, Czech Republic, BURES MARTIN , KLEEFOOT MAX-JONATHAN ,   Aalen University, Laser Application Centre, Germany, BAKIR YUSUF ,   Regional Technological Institute, University of West Bohemia, Czech Republic, ZETEK MIROSLAV ,   Regional Technological Institute, University of West Bohemia, Czech Republic
Published: September 2022

This article is focused on the laser macro polishing of additively manufactured (AM) parts. The material that is being processed is maraging steel (MS1). The main part of the study is to find suitable parameters to significantly reduce the surface roughness of 3 surfaces with completely different topologies. The investigated parameters are scanning speed, defocussed laser and laser power. However, other material properties are also tested. Fatigue life, tensile and hardness testing were carried out for 3 different sets of laser macro polishing parameters. It was found that surface roughness reduction of Ra by over 90 % is possible. Interestingly, tensile testing of parameters 1 and 2 showed more brittle-like behaviour in comparison to parameter 3. This was further supported by hardness testing, which showed increased hardness in the centre of the samples.
Development of a Novel Hybrid Suture Anchor for Osteoporosis by Integrating Titanium 3D Printing and Traditional Machining
Authors: Chen Chih-Hwa , Chang Wen-Jen , Chen Yu-San , Chen Kuan Hao , Huang Shao-Fu , Hsueh Hsin-Ru , Li Cun-Bin , Lin Chun-Li
Published: September 2022

The aim of this study is to develop a titanium three-dimensional (3D) printing novel hybrid suture anchor (HSA) with wing structure mechanism which can be opened to provide better holding power for surrounding osteoporotic bone. A screw-type anchor (5.5-mm diameter and 16-mm length) was designed with wing mechanism as well as micro dual-thread in the outer cortex bone contact area and macro single-thread in the anchor body. Both side wings can be opened by an internal screw to provide better bone holding power. The suture anchor and internal screw were manufactured using Ti6Al4V 3D printing and traditional machining, respectively. Static pullout and after dynamic 300-cyclic load (150 N) pullout tests for HSA with or without the wing open and commercial solid anchor (CSA) were performed (n = 5) in severely osteoporotic bone and osteoporotic bone to evaluate failure strengths. Comparison of histomorphometrical evaluation was performed through in vivo pig implantation of HSAs with the wing open and CSAs. The failure strengths of HSA with or without the wing open were 2.50/1.95- and 2.46/2.17-fold higher than those of CSA for static and after dynamic load pullout tests in severely osteoporotic bone, respectively. Corresponding values for static and after dynamic load pullout tests were 1.81/1.54- and 1.77/1.62-fold in osteoporotic bone, respectively. Histomorphometrical evaluation revealed that the effects of new bone ingrowth along the anchor contour for CSA and HSA were both approximately 20% with no significant difference. A novel HSA with wing mechanism was developed using 3D printing and the opened wing mechanism can be used to increase bone holding power for osteoporosis when necessary. Better failure strength of HSA than CSA under static and after dynamic load pullout tests and equivalence of bone ingrowth along the anchor contours confirmed the feasibility of the novel HSA.
A Review on Bioinks and their Application in Plant Bioprinting
Authors: Ghosh Susmita , Yi Hee-Gyeong
Published: September 2022

In recent years, the characterization and fabrication methods concerning new bioinks have received much attention, largely because the absence of bioprintable materials has been identified as one of the most rudimentary challenges for rapid advancement in the field of three-dimensional (3D) printing. Bioinks for printing mammalian organs have been rapidly produced, but bioinks in the field of plant science remain sparse. Thus, 3D fabrication of plant parts is still in its infancy due to the lack of appropriate bioink materials, and aside from that, the difficulty in recreating sophisticated microarchitectures that accurately and safely mimic natural biological activities is a concern. Therefore, this review article is designed to emphasize the significance of bioinks and their applications in plant bioprinting.
Preparation and Characterization of 3D Printed Porous 45S5 Bioglass Bioceramic for Bone Tissue Engineering Application
Authors: Dong Zhihong , Gong Jiabao , Zhang Haowei , Ni Yanting , Cheng Lijia , Song Qiaoyu , Tang Lu , Xing Fei , Liu Ming , Zhou Changchun
Published: September 2022

Three-dimensional (3D) printing technology provides advanced technical support for designing personalized bone tissue engineering scaffold. In this study, two porous diffusing models, namely, average and layered perforated cylindrical scaffolds, were designed for bone tissue engineering scaffold. The designed models were fabricated by liquid crystal display mask stereolithography printing. Structural design and finite element mechanical analysis were conducted. 45S5 bioglass was selected as the raw material for preparing the printing inks for bone tissue engineering scaffolds. By adjusting the viscosity and temperature of the slurry, the maximum proportion of 45S5 bioglass (40 wt%) was added into the photosensitive resin for preparing 3D printing slurry. Our results indicated that an optimized sintering condition includes the debinding rate (0.5°C/ min), and temperature raising rate (5°C/min) and sintering temperature (1100°C) were proposed to sinter 45S5 bioceramic scaffolds. The amorphous 45S5 bioglass showed good crystallization after sintering, and the scaffold porous structure showed good integrity. Micropores were observed in the struts which interconnected with each other. Moreover, the porosities were tested as 57% and 45% with a uniform pore distribution. The shrinkage rate was about 10% during sintering process due to binder burning and crystallization shrinkage. The compressive strength of the sintered scaffold was 0.71 ± 0.048 MPa and 2.13 ± 0.054 MPa, respectively, which are consistent with the finite element mechanical analysis simulation results. In conclusion, the layered perforated 45S5 bioglass scaffold shows good mechanical properties and porosity, indicating that it could be a promising candidate for bone tissue engineering.
Comparison Performance of Environmental, Social, and Governance Stock Index with Sharia Stock Index Before and During the Covid-19 Pandemic in Southeast Asia
Authors: Nuraeni Een , Fakhrunnas Faaza
Published: September 2022

Covid-19 is a pandemic event with a global impact from a health and economic point of view. The number of confirmed cases of Covid-19 that continues to grow has caused several countries to implement lockdown policies. However, this has implications for an increasingly depressed stock market. Thus, it can affect the performance of stock indexes in various countries. This research aims to examine the effects of Covid-19 on the Islamic stock index and the environmental, social, and governance stock index in Southeast Asia, and then compare the two indexes when responding to the Covid-19 pandemic. The models used in this research are event study and Vector Error Correction Model (VECM). This study utilizes time-series data with a five-month daily period starting from December 2019 to April 2020. The results of the event study model show that the number of positive cases of Covid-19 has a significant effect on the performance of the stock index studied, except for the ESG stock indexes in Singapore. Meanwhile, the results from the VECM show that the number of positive cases of Covid-19 has a significant effect on the stock index’s performance in the long and short term, except for the sharia stock index which does not have a significant impact on the short term in Singapore, and does not have a significant impact on the long term in Malaysia namely HIJRAH index.
The Effect of Gender Diversity in The Boardroom and Company Growth on Environmental, Social, and Governance Disclosure (ESGD)
Authors: Pramono Chrisna , Nasih Mohammad
Published: September 2022

Research aims: This study aims to obtain empirical evidence regarding gender diversity in the boardroom on ESGD (environmental, social, and governance disclosures). In this case, an entity should not only be profit-oriented but rather carry out a form of corporate social responsibility so that the company's sustainability is considered a form of decision-making.Design/Methodology/Approach: The sample was companies listed on the Indonesia Stock Exchange for 2010-2018. The data obtained were based on the annual and sustainability reports. This study used a quantitative approach with multiple linear analyses, with the help of the Software STATA 15 program as hypothesis testing.Research findings: The results uncovered that gender diversity in the boardroom had a significant and positive effect on environmental, social, and governance disclosures, and company growth strengthened their relationship.Theoretical contribution/Originality: This study attempts to see how the company's growth in building CSR in companies with board diversity. In addition, the results of this study are a discussion of and in line with the theory of legitimacy, upper echelons, and stakeholders.Practitioner/Policy implication: The practical contribution of this study is that the placement of people with gender diversity on the board is crucial. When the company recruits a woman to its board, its ESGD level will change. Research limitation/Implication: This study was limited to the value of overall disclosure, so it is hoped that future researchers can categorize each environmental, social, and governance indicator more broadly.
Composite Manufacturing of Coir Fiber-Reinforced Polyester as a Motorcycle Helmet Material
Authors: Sasria Nia
Published: September 2022

Berdasarkan standar SNI 1811-2007 helm di Indonesia terbuat dari bahan polimer ABS (Acrylonitrile Butadiene Styrene) yang harganya relatif mahal. Oleh karena itu, dibutuhkan alternatif pengganti dengan pemanfaatan limbah serat alam sebagai bahan pembuatan komposit. Tujuan penelitian ini yaitu menganalisis pengaruh komposisi material, ketahanan impak, dan kekuatan bending material helm dari serat sabut kelapa dan resin poliester dengan perbandingan 20%:80%, 40%:60% dan 60%:40%. Ukuran panjang serat yang digunakan adalah 50 mm dengan perlakuan kimia pada serat menggunakan larutan NaOH 5% selama 2 jam. Komposit dibuat dengan metode compression molding. Penelitian ini menggunakan metode pengujian berupa uji impak ASTM D6110, uji tekuk ASTM D790-03, uji mikrostruktur, dan uji SEM. Didapatkan hasil data dengan nilai tenaga patah optimum sebesar 55,542 J dan nilai kekuatan impak optimum sebesar 0,408 J/mm2 pada spesimen B. Hasil uji bending didapatkan nilai kekuatan tekuk optimum sebesar 52,785 MPa dan nilai modulus elastisitas optimum sebesar 13,064 GPa pada spesimen A. Standar uji kekuatan impak menurut SNI 1811-2007 adalah 29000 J/mm, sedangkan nilai kekuatan impak spesimen ini sebesar 0,408 J/mm2 sehingga masih belum mencukupi untuk dijadikan bahan alternatif helm. Based on the SNI 1811-2007 standard, helmets in Indonesia are made of ABS (Acrylonitrile Butadiene Styrene) polymer material which is relatively expensive. Therefore, an alternative is needed by utilizing natural fiber waste reinforced as a composite material. The purpose of the study was to analyze the effect of material composition, impact resistance, and bending strength of helmet material from coconut fiber and polyester resin with a ratio of 20%: 80%, 40%: 60%, and 60%: 40%. The fiber length used is 50 mm, with chemical treatment on the fiber using 5% NaOH solution for 2 hours. Composites were made by the compression molding method. In this study, testing was used in the form of impact test ASTM D6110, bending test ASTM D790-03, microstructure test, and SEM test. The data was obtained with the optimum fracture strength value of 55.542 J and the optimum impact strength value of 0.408 J/mm2 on specimen B. In the bending test, the data was obtained with the optimum bending strength value of 52.785 MPa and the optimum elastic modulus value of 13,064 GPa at specimen A. The impact strength test standard according to SNI 1811-2007 is 29000 J/mm, while the impact strength value of this specimen is 0.408 J/mm2. Thus, it is still not sufficient to be used as an alternative helmet material.
Pengaruh Variasi Debit Air Terhadap Unjuk Kerja Termal Tangki Pemanas Air Tenaga Surya yang Berisi Phase-Change Material
Authors: Nadjib Muhammad , Santosa Tito Hadji Agung
Published: September 2022

Integrasi air dan phase-change material (PCM) menarik diterapkan pada pemanas air tenaga surya (PATS). Teknik enkapsulasi PCM menggunakan kapsul dapat dilakukan di dalam tangki PATS. Sejauh ini, karakteristik termal di dalam tangki PATS posisi horizontal berisi PCM yang berkaitan dengan variasi debit air belum pernah diungkap. Penelitian ini bertujuan untuk menyelidiki karakteristik termal tangki PATS yang melibatkan PCM dengan variasi debit air.  Eksperimen menggunakan PATS sistem aktif dengan volume tangki 60 liter. Kapsul silinder berjumlah 24 buah diisi paraffin wax dan dimasukkan ke dalam tangki PATS. Termokopel sebanyak 20 buah dipasang di sisi air dan paraffin wax. Proses charging dilakukan selama 160 menit. Variasi debit air yang digunakan adalah 1 lpm, 2 lpm dan 3 lpm. Data temperatur air dan paraffin wax digunakan untuk menganalisis kinerja termal PATS. Hasil karakteristik termal dari tiga eksperimen kemudian dibandingkan. Energi termal akumulatif yang diperoleh untuk debit aliran 1 lpm, 2 lpm dan 3 lpm masing-masing adalah 12,09 MJ, 14,08 MJ dan 16,59 MJ. Penambahan debit aliran air mampu meningkatkan unjuk kerja termal sistem PATS yang melibatkan PCM.The integration of water and phase-change materials (PCM) is interestingly applied to solar water heaters (SWH). PCM encapsulation technique using capsules can be carried out in an SWH tank. So far, the thermal characteristics in the horizontal position of the SWH tank containing PCM related to variations in water flow have not been revealed. This study investigates the thermal characteristics of SWH tanks involving PCM with variations in water discharge. This experiment uses an active SWH system with a tank volume of 60 liters. The 24 cylindrical capsules were filled with paraffin wax and put into the SWH tank. There were twenty thermocouples installed on the waterside and paraffin wax. The charging process is carried out for 160 minutes. Variations of water discharge used are 1 lpm, 2 lpm, and 3 lpm. Water temperature data and paraffin wax were used to analyze the thermal performance of SWH. The results of the thermal characteristics of the three experiments were then compared. The accumulative thermal energy obtained for flow rates of 1 lpm, 2 lpm, and 3 lpm was 12.09 MJ, 14.08 MJ, and 16.59 MJ, respectively. The addition of the water flow rate can increase the thermal performance of the SWH system involving PCM.
Signaling Specific Skills and the Labor Market of College Graduates
Authors: Busso Matías , Montaño Sebastián
Published: September 2022

We study how signaling skills specic to the major aects labor market outcomes of college graduates. We rely on census-like data and a regression discontinuity design to study the impacts of a well-known award given to top performers on a mandatory nationwide exam, which constitutes a graduation requirement for college seniors in Colombia. Students who can rely on the signal when searching for a job have a wage premium of 7 to 12 percent compared to otherwise identical students. This positive return persists even ve years after graduation. The signal mostly benets workers who graduate from low-reputation colleges, and allows workers to nd jobs in more productive rms and in sectors that better use their skills. We rule out that the positive wage returns are explained by human capital. The signal favors mostly less advantaged groups, implying that less information frictions about students' skills could potentially reduce earnings gaps. Our results imply that information policies like those that formally certify specic skills can potentially improve the eciency in talent allocation of the economy and level the playing eld for workers who come from disadvantaged backgrounds.
Brecha de ingresos laborales por género en Paraguay: un análisis de su evolución año por año entre 2002 y 2019
Authors: Urquidi Manuel , Chalup Miguel , Durand Guillaume
Published: September 2022

En Paraguay se puede apreciar que la brecha de ingresos laborales entre hombres y mujeres está concentrada principalmente en el sector informal, específicamente en grupos con menores niveles educativos y del área rural. Además, se percibe una diferencia de ingresos heterogénea, pero a favor de los hombres en la mayoría de las actividades económicas. Gran parte de esta brecha no está explicada por variables como experiencia, características personales y familiares, sector y actividad económica, región o zona del país, por lo que probablemente está relacionada a factores normativos, sesgos o discriminación (Becker, 2005). En el presente documento se analiza la evolución de la brecha de género en Paraguay entre 2002 y 2019. Se utilizan como insumo las Encuestas de Hogares, realizadas por el Instituto Nacional de Estadística de Paraguay (INE) y armonizadas por el Banco Interamericano de Desarrollo (BID), y se presentan dos modelos para la estimación de la brecha de ingresos laborales, las descomposiciones Blinder-Oaxaca y opo. A través del análisis en el tiempo, se evidencia que el comportamiento de la brecha de ingresos por género no muestra un patrón claro de reducción o aumento en el periodo analizado.
Empleos y habilidades verdes en América Latina: Una mirada a los datos de LinkedIn
Authors: Alfonso Mariana , Azuara Herrera Oliver , Mondragón Mauricio
Published: September 2022

LinkedIn ha desarrollado distintos conceptos para analizar las tendencias de los empleos verdes en su plataforma. La alianza entre LinkedIn y el Banco Interamericano de Desarrollo (a través del Data Partnership) ha permitido acceder a datos clave sobre el uso de esta plataforma que reflejan el comportamiento del empleo en sectores clave en la región. Con la información disponible, se puede dar seguimiento a los indicadores que calcula LinkedIn a partir de la información de sus usuarios, con foco en la economía verde para América Latina y el Caribe. La tasa de contratación verde ha experimentado un rápido crecimiento desde 2020. Sin embargo, dicho crecimiento fue menos dinámico en comparación con la tasa de contratación general para casi todos los países. Servicios ambientales destaca como la habilidad que tuvo el mayor crecimiento en los últimos cinco años para los países con los que se cuenta con la información desagregada. La agricultura es la industria con mayor penetración de habilidades verdes en la región. Además, entre las industrias con alta penetración de habilidades verdes, es la única que ha mostrado una tendencia de crecimiento en este indicador; las demás se han estancado, o han incluso reducido su nivel de penetración.