bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of heating to high temperatures on mechanical properties of boride-based refractory materials
Authors: Lokatkina Anastasiia , Prikhna Tetiana , Moshchil Viktor , Barvitskyi Pavlo , Borimsky Oleksandra , Devin Leonid , Ponomaryov Semyon , Haber Richard , Talako Tatiana , Bondar Anatoly 
Published: May 2021

The object of research is HfB2, ZrB2 and ceramics composition HfB2-30 % SiC and ZrB2-20 % SiC, ZrB2-20 % SiC-4 % Si3N4 obtained under high pressure, their mechanical characteristics before and after heating to high temperatures and temperatures of beginning of melting. The research was conducted in order to create new effective refractory materials for use in the aerospace industry. Therefore, the melting temperatures of sintered materials and the effect of heating on their mechanical properties were also studied. Additives (ZrB2-20 % SiC and HfB2-30 % SiC) although led to a decrease in specific gravity. But increased hardness (by 17 % and 46 % in the case of ZrB2 and HfB2, respectively) and fracture toughness (by 40 % and 21 % in the case of ZrB2 and HfB2, respectively). However, significantly reduced the onset of melting temperature in vacuum to 2150–2160 °C.
Materials sintered from ZrB2 and HfB2 was not melted after heating to 2970 °C. After heating to a melting point of 2150–2160 °C (in the case of materials with additives) and to temperatures of 2970 °C (in the case of materials sintered with ZrB2 or HfB2), the hardness and fracture toughness decreased. Thus, the hardness of the material prepared from ZrB2 decreased by 19 % and its fracture toughness – by 18 %, and of that prepared from ZrB2–20 % SiC – by 46 % and 32 %, respectively. The hardness of the material prepared from HfB2 decreased by 46 %, its fracture toughness – by 55 %, and of that prepared from HfB2-30 % SiC, after heating decreased by 40 %, but its fracture toughness increased by 15 %. The sintered HfB2 (with a density of 10.4 g/cm3) before heating showed a hardness of HV(9.8 N)=21.27±0.84 GPa, HV(49 N)=19.29±1.34 and HV(98 N)=19.17±0.5, and fracture toughness K1C(9.8 N)=0.47 MH·m0.5, and ZrB2 with a density of 6.2 g/cm3 was characterized by HV(9.8 N)=17.66±0.60 GPa, HV(49 N)=15.25±1.22 GPa and HV(98 N)=15.32±0.36 GPa, K1C(9.8 N)=4.3 MH·m0.5. Material sintered with HfB2-30 % SiC (density 6.21 g/cm3) had Hv(9.8 N)=38.1±1.4 GPa, HV(49 N)=27.7±2.8 GPa, and K1C(9.8 N)=8.1 MH·m0.5, K1C(49 H)=6.8 MH·m0.5. The sintered with ZrB2-20 % SiC material had density of 5.04 g/cm3, HV(9.8 N)=24.2±1.9 GPa, HV(49 N)=16.7±2.8 GPa, K1C(49 H)=7.1 MH·m0.5. The SiC addition to the initial mixture significantly reduces the elasticity of the materials.
Principais marcadores tumorais de câncer de mama: revisão da literatura
Authors: Da Silva Mônica Pereira , De Campos Renata Aparecida , Simioni Patricia Ucelli 
Published: May 2021

O câncer é uma alteração celular decorrente de alterações multifatoriais, como a idade, fatores genéticos e lesões proliferativas atípicas, podendo atingir um ou vários órgãos do corpo. O tumor de mama se destaca pelo seu risco letal e mutilador, sendo que sua identificação em estágios inicias resulta em uma maior chance de cura. Os marcadores tumorais são substâncias encontrados em tumores e em líquidos biológicos e alterações na expressão dos mesmos estão diretamente ligadas ao crescimento de células neoplásicas. Existem vários marcadores tumorais, sendo que alguns podem ser específicos enquanto outros estão presentes em diversos tipos de tumores. Estes biomarcadores são importantes para o diagnóstico precoce do tumor de mama, favorecendo o tratamento e a sobrevida do paciente. Os marcadores mais utilizados para diagnóstico e acompanhamento clínico de tumores de mama são: antígeno tumoral semelhante à mucina (MCA; mucin like antigen), antígeno do tumor 15.3 (CA15.3), antígeno de câncer 27.29 (CA 27.29), oncogene C-erbB-2, catepsina e antígeno carcinoembrionário (CEA). Embora esses marcadores sejam amplamente utilizados, a avaliação de novos marcadores irá possibilitar o desenvolvimento de novos estudos clínicos, entre eles terapias gênicas específicas para tumores de mama.
Vegetal ornaments in the Late Avar decorative art
Authors: Szenthe Gergely 
Published: May 2021

Abstract of PhD thesis submitted in 2013 to the Archaeology Doctoral Programme, Doctoral School of History, Eötvös Loránd University, Budapest under the supervision of Tivadar Vida.
This paper is the modified version of the abstract of my doctoral thesis. The thesis discusses the vegetal ornaments of the Late Avar period (ca. a long 8th century AD) from the perspective of the cultural history, with the aim to create a basis for social historical studies. The Late Avar period had an art of ornamental functions. According to their inner structure the four different ornamental phases of the Late Avar period may have been determined by external cultural trends mostly of the Mediterranean. As the substance of the Mediterranean ‘dark age’ was regionalisation, the Late Avar material culture showed some autonomous features. The global cultural processes based on the social transformation of the Late Antique Mediterranean and Western-European world led to different cultural phenomena under the different social circumstances of the Avar milieu.
DGM tekniği ile sürülen aç-kapa tipi solenoid yapılı elektro-pnömatik fren valfinin modellenmesi ve analizi
Authors: ERZAN TOPÇU Elif , BALİ Ersel 
Published: May 2021

Elektro- pnömatik fren valf
sistemlerinde oransal hava akışının sağlanabilmesi için oransal yapılı solenoid
valfler kullanılmaktadır. Oransal valfler belli bir çalışma bölgesinde giriş
gerilimine göre oransal çıkış vermektedirler. Bu valflere göre daha basit
yapılı, ucuz ve üretimi kolay olan aç- kapa tipi solenoid valflerin Darbe
Genişlik Modülasyon (DGM) gibi tekniklerle uygun şekilde sürülmesiyle bu
valflerden de oransal çıkış elde edilebilmektedir. Bu çalışmada
elektro-pnömatik fren valfinde oransal solenoid yerine aç-kapa tipi solenoid
yapısının kullanılabilirliği teorik olarak incelenmiştir. Sistemin mevcut
çalışma şartları dikkate alınarak tasarımı yapılan solenoid valfin dinamik
karakteristikleri sonlu elemanlar ve model tabanlı tasarım yöntemleri
kullanılarak modellenmiştir. Her iki
yöntemle de elde edilen sonuçların birbiriyle uyumlu olduğu görülmüştür. Model
tabanlı tasarım yöntemiyle çalışmaya devam edilerek elektro-pnömatik fren valfi
sistemi DGM tekniği ile sürülmüş ve sistemin oransal çalışma davranışı
incelenmiştir. Sonuç olarak tasarlanan valfin açma ve kapama zamanları dikkate
alınarak belirlenen frekanslara göre sistemin DGM sinyaliyle sürülmesi sonucunda
elektro-pnömatik fren valfi çıkışından oransal çıkış elde edilebildiği
görülmüştür.
AISI H10 sıcak iş takım çeliğinin mekanik özelliklerine temperleme ve yaşlanma işlemlerinin etkisi
Authors: TAŞTEMÜR Demet , GÜNDÜZ Süleyman 
Published: May 2021

Bu çalışmada, 1050 °C’de 1 saat östenitleme işlemi
uygulandıktan sonra suda soğutulan ve ardından 550 oC’de farklı
zaman aralıklarında temperlenen AISI H10 sıcak iş takım çeliğinin mikroyapı ve
mekanik özellikleri incelenmiştir. Ayrıca optimum parametrelerin elde edildiği
550 °C’de 2 saat temperlenen numunelerin dinamik deformasyon yaşlanma
davranışları araştırılmıştır. Yaşlandırma işleminde çekme deneyleri 25-700 °C
sıcaklık aralığında ve 1x10-3 s-1 deformasyon oranında
gerçekleştirilmiştir. Çekme sonucu kopan numunelerin kırık yüzeyleri
incelenerek dinamik deformasyon yaşlanmasının kırılma davranışına etkisi tespit
edilmiştir. Çekme sonuçları temperlenmiş numunelerin dinamik deformasyon
yaşlanması ile tutarlı olarak 200 °C ve 300 °C'de akma dayanımında ve maksimum
çekme dayanımında bir artış olduğunu, ancak % uzama değerlerinin sabit kaldığını göstermiştir. AISI H10 sıcak iş takım
çeliğinde dislokasyonlar ile arayer atomları (C veya N) veya yer alan atomları
(Cr veya Mo) arasındaki etkileşim nedeniyle dinamik deformasyon yaşlanmasının
farklı sıcaklıklarda meydana geldiği gözlenmiştir.
Tarihi yapıların deprem performansının belirlenmesi için basitleştirilmiş bir yöntem: Kaya Çelebi Cami örneği
Authors: ÇAKIR Ferit 
Published: May 2021

Türkiye topraklarının büyük bir bölümünün aktif deprem kuşakları içinde olduğu ve tarih boyunca ülkemizde birçok yıkıcı depremin meydana geldiği bilinmektedir. Yapılan çalışmalar, tarihi yapıların deprem performanslarının diğer yapılara nazaran daha iyi olduğunu gösterse de bazı depremlerde tarihi yapıların ciddi hasar gördüğü anlaşılmaktadır. Bunun en önemli örneklerinden biride 23 Ekim 2011 tarihinde meydana gelen 7,2 büyüklüğündeki Van depremi ve bu depremin artçılarının tarihi yapılar üzerinde bıraktığı ciddi hasarlardır. 2011 yılında yaşanan Van depremi ve sonrasında meydana gelen artçı depremler yüksek can ve mal kayıplarıyla birlikte birçok tarihi yapının da zarar görmesine neden olmuştur.
Bu çalışma kapsamında 2011 Van depreminin tarihi yapılar üzerindeki etkileri araştırılmış ve deprem sırasında ciddi hasarlar alarak bazı bölümleri hasar gören tarihi Kaya Çelebi Cami’nin sismik performansı incelenmiştir.
Observations on seismic waves reflected at the core boundary of the earth*
Authors: Martner Samuel T. 
Published: May 2021

Abstract
Waves reflected from the outer boundary of the core of the earth often record trace amplitudes that appear excessive. A comparison of the observed displacements of these phases and the direct body waves is presented. Observational data seem to confirm the idea that the displacement ratios of the longitudinal waves reflected at the core to the longitudinal direct waves is larger than the presently recognized theory indicates. A discussion is included of some possible causes for this difference, but reasonable changes in accepted assumptions fail to explain the entire discrepancy.
Direction of faulting in certain earthquakes of the North Pacific*
Authors: Hodgson J. H. , Milne W. G. 
Published: May 2021

Abstract
Byerly has shown that when stations are plotted in extended position the initial motion will be compressional in two lunes of the earth and rarefactional in two others, the direction of displacement being opposite in alternate segments. These lunes are formed by the intersection of the earth's surface with the fault plane and with a plane through the epicentre perpendicular to the motion direction. Certain geometrical consequences of the orthogonality of this second plane and the motion direction are here deduced. The extended theory is applied to four earthquakes, one in the Aleutians, one in central Alaska, one in the Queen Charlotte Islands, and one in Vancouver Island, the strike and dip of the fault and the direction of slipping being determined in each case. The seismic results are discussed in the light of other information available.
EMPLOYEES’ ENGAGEMENT AND CUSTOMERS’ LOYALTY FOR UTILITARIAN SERVICES: A MODERATED MEDIATION MODEL
Authors: Afridi Sajjad Ahmad , Khan Wajid , Javed Asad , Waseem Muhammad , Saifullah Kaleem 
Published: May 2021

Purpose of the study: The present study aimed to determine the impact of employee engagement on customers’ loyalty through customers’ engagement. Moreover, this study also aimed to examine the moderating role of customers’ trust and the mediating role of customers’ engagement on the relationship between employees’ engagement and customers’ loyalty.
Methodology: The data were collected from 220 insurance service users through a non-probability sampling technique. Data reliability and validity were confirmed through Cronbach’s alpha and confirmatory factor analysis and hypotheses were tested through Andrew F. Hayes model 7.
Main Findings: Results show a significant direct effect of employee engagement on customers’ loyalty. Moreover, the findings confirmed the significant role of customers’ engagement as a mediator between employee engagement and customers’ loyalty. Results also confirmed customers’ trust moderating effect between employee engagement and customers’ engagement. Furthermore, the result confirmed the mediation of trust-based-customers engagement between the link of employee engagement and customers’ loyalty.
Applications of this study: This study would have some positive repercussions for utilitarian services such as insurance services providers. For instance, this study's findings revealed the process through which companies can make customers more loyal. Insurance companies through their employees' engagement and customer engagement can make a dyade that can better explain customers’ loyalty.
Novelty/Originality of this study: This study explored the underlying mechanism that links employee engagement to customers’ loyalty. Moreover, this study introduces a new term “trust-based engagement” as an important attribute in enhancing customers’ loyalty in general and particularly for insurance companies.
DECIPHERING THE FAIRYTALE: DECONSTRUCTION OF ROMANCE THROUGH THE CONSTRUCTION OF SELF IN PYGMALION
Authors: Jaffar Nosheen 
Published: May 2021

Purpose: This study examines Eliza’s character in Bernard Shaw’s play Pygmalion and her construction of self through the deconstruction of romance in the play.
Methodology: This research is a qualitative study applying the content analysis method. A qualitative research design was adopted to investigate and look at various traits of the main character and her evolution to become an independent, thinking, and opinionated individual towards the end. The research data in this paper is drawn from two primary sources: literary books and articles.
Main Findings: The analysis of the text unravels the transformation of the character and her eventual emancipation from the shackles of the expected programmed behavior.
Applications: This paper can be used by literary scholars, and students.
Novelty/Originality: In the past, many researchers have contributed articles on the thematic analysis of Pygmalion, while this paper approached the play from both linguistic and thematic viewpoints and provided insights for other researchers in the field. The insights based on language analysis of Pygmalion presented in this paper can be a model for other researchers in the interdisciplinary fields of language and literature to apply similar approaches to analyze literary texts.
Optimización del mecanizado de agujeros profundos de pequeño diámetro por electroerosión usando la metodología Taguchi
Authors: Jiménez-Chavarro Guillermo , Vieira-Porto Arthur José , Hideaki-Tsunaki Roberto 
Published: May 2021

Realizar agujeros profundos de pequeño diámetro en metales de alta dureza es una operación que está fuera del alcance del proceso de perforación con arranque de viruta, uno de los procesos más adecuados para ello es el mecanizado por electroerosión. Debido a las múltiples variables involucradas en electroerosión y a las restricciones impuestas por las dimensiones reducidas, es necesario determinar el nivel de ajuste preciso de cada una de las variables para realizar un mecanizado eficiente y de buena calidad. Usando un arreglo ortogonal L27 Taguchi, fue posible analizar el efecto de las variables eléctricas, de limpieza y del diámetro del electrodo sobre las características del mecanizado de perforaciones de pequeño diámetro en piezas de acero rápido DIN 1.3344. El análisis de los resultados experimentales y su conversión a señales de ruido permitieron optimizar la tasa de remoción de material, la velocidad de avance de perforación, el desgaste del electrodo y la rugosidad superficial.
Plain language as a tool used in the adaptation of texts for the purpose of teaching Polish as a foreign language — research overview
Authors: Matyjaszczyk-Łoboda Olga 
Published: May 2021

The aim of the article is to collect and present studies into text comprehensibility conducted so far. The author examines studies dealing with plain language, Polish language teaching and pedagogy. The article opens with an overview of the history of research into text difficulty in the world featuring various concepts of automatic measurement of text difficulty level. Next the author presents studies devoted to comprehensibility of utterances in Poland, as well as studies concerning text difficulty with regard to language teaching. This is followed by a discussion of the principles of the text simplification principle according to the Wrocław plain language model and in the teaching of Polish.The article closes with a short overview of publications containing simplified authentic texts used in the teaching of Polish as a foreign language.
Fatigue Detection on Face Image Using FaceNet Algorithm and K-Nearest Neighbor Classifier
Authors: Adhinata Faisal Dharma , Rakhmadani Diovianto Putra , Wijayanto Danur 
Published: May 2021

Background: The COVID-19 pandemic has made people spend more time on online meetings more than ever. The prolonged time looking at the monitor may cause fatigue, which can subsequently impact the mental and physical health. A fatigue detection system is needed to monitor the Internet users well-being. Previous research related to the fatigue detection system used a fuzzy system, but the accuracy was below 85%. In this research, machine learning is used to improve accuracy.Objective: This research examines the combination of the FaceNet algorithm with either k-nearest neighbor (K-NN) or multiclass support vector machine (SVM) to improve the accuracy.Methods: In this study, we used the UTA-RLDD dataset. The features used for fatigue detection come from the face, so the dataset is segmented using the Haar Cascades method, which is then resized. The feature extraction process uses FaceNet's pre-trained algorithm. The extracted features are classified into three classes—focused, unfocused, and fatigue—using the K-NN or multiclass SVM method.Results: The combination between the FaceNet algorithm and K-NN, with a value of resulted in a better accuracy than the FaceNet algorithm with multiclass SVM with the polynomial kernel (at 94.68% and 89.87% respectively). The processing speed of both combinations of methods has allowed for real-time data processing.Conclusion: This research provides an overview of methods for early fatigue detection while working at the computer so that we can limit staring at the computer screen too long and switch places to maintain the health of our eyes.
SPECIFICS OF FORECASTING METHODOLOGY INDUSTRIAL INJURIES AND PROFESSIONAL DISEASES
Authors: POLUKAROV Yury , ZEMLYANSKA Olena , KACHYNSKA Nataliia , MITIUK Liudmyla 
Published: May 2021

Purpose. Substantiate the need for development of new scientific and methodological foundations for forecasting occupational injuries and illnesses.
Methodology. Analyze existing methods of occupational injuries and illnesses forecasting, propose a new algorithm for calculation of their levels, set scientific and methodological requirements to information analysis system used for the prevention of occupational illnesses.
Findings. Modern methods of forecasting injuries make it possible to assess the effectiveness of preventive measures. However, there is no universal method for analyzing the occupational morbidity due to the different specifics of disease causes and manifestations which do not allow to conduct a realistic assessment of labor protection in a particular area over a given period of time. Therefore, it is the reduction in the level of occupational injuries and illnesses compared to the data obtained by the forecasting method that may be indicative of preventive measures effectiveness. At the same time, development of information analysis system of personal protective equipment continues to be a pressing issue (PPE).
Originality. It has been proposed to develop a special mathematical tool for determining loss reduction and information analysis system, which will provide a forecasted estimate of occupational morbidity at an enterprise. To obtain a reliable forecast it is important to identify the average value of cases over a given period of time, which has been considered in this paper.
Conclusions and Practical Significance. There are numerous methods available for analysis of occupational injuries and illnesses. Most of them, however, are unfit for the assessment of occupational diseases. Since chronic occupational illnesses have a cumulative nature, the rate of work-related diseases is more predictable than that of injuries and accidents. This makes it possible to determine the “occupational morbidity rate” provided that the time spent by workers in the area of exposure to occupational hazards is recorded together with reference data on the conditional level of exposure to each hazard.
Keywords: forecasting, injuries, occupational morbidity, occupational safety activities, hazard, information analysis system.
Gustilo IIIA Open Bimalleolar Fracture Dislocation of Ankle with Ipsilateral Achilles Tendon Rupture
Authors: Sarrel Kara , Girard Paul 
Published: May 2021

Case:
Although rare, a medial malleolus fracture plus ipsilateral Achilles tendon rupture has been described in previous case reports. We present a unique case of an open bimalleolar fracture dislocation with ipsilateral Achilles tendon rupture after a motorcycle crash. His Achilles injury was diagnosed intraoperatively during external fixator placement. He presented in a delayed fashion to our institution, where he underwent open reduction internal fixation and Achilles tendon reconstruction.

Conclusion:
Although most commonly described with isolated medial malleolus fractures, Achilles tendon injuries can also be associated with bimalleolar ankle fractures. These associated injuries are frequently missed.
Cement Spacer Formed in a 3D-Printed Mold for Endoprosthetic Reconstruction of an Infected Sarcomatous Radius
Authors: Exner G. Ulrich , Dumont Charles E. , Walker Jonas , Fürnstahl Philipp 
Published: May 2021

Case:
The ulcerated recurrent clear cell sarcoma of the forearm with bony invasion of the radius needed an uncontaminated resection and control of infection. A mold was printed based on CT-reconstructed 3D models of the patient's anatomy to create an antibiotic-loaded cement spacer as endoprosthetic replacement used in combination with soft-tissue reconstruction and systemic antibiotics.

Conclusion:
This then undescribed novel technique allowed for fast local recovery of the patient's hand function and return to work. In selected cases, such an anatomically formed spacer may be preferred for faster functional recovery and longer intervals before definitive reconstruction is possible.
Hajdu-Cheney Syndrome
Authors: Duraiswamy Gopinath , Ashraf Munis , Sambandam Senthil Nathan , Shanmugasundaram Saseendar 
Published: May 2021

Case:
The phenomenon of acro-osteolysis often intrigues clinicians and patients alike, as it causes bone resorption. One such condition is Hajdu-Cheney syndrome. We report our experience in identifying and halting the active bone resorption in a patient and his father with 2-year follow-up results.

Conclusion:
Management included identification of the NOTCH2 mutation and treatment with antiresorptive measures. In addition, genetic counseling and antenatal counseling are recommended to explain the risk of inheritance.