bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Volatile Compounds in Black Tea Made from Frost-damaged Tea Leaves by Comprehensive Two-dimensional Gas Chromatography-Time of Flight Mass Spectrometry
Authors:   The Korean Tea Society, Kang Suyoung , Kim Daeyeon , Kim Seok-Hwa , Shim Doobo , Cho Kyung Hwan , Kim Jong Cheol , Moon Joonkwan
Published: October 2023

Korea suffers from unusual droughts, heavy rain, or high temperatures due to the abnormal weather phenomenon worldwide. This climate change directly impacts the occurrence of frost in spring, which is causing serious damage to the buds and leaves of tea plants that mainly grow in spring. Frost damage delays the harvest time and decreases production, leading to a decline in the income of tea-producing farmers. Therefore, it is essential to develop ways of using discarded tea leaves. This study analyzed the volatile compounds in black tea prepared from the discarded tea leaves by two-dimensional gas chromatography-time of flight mass spectrometry (GC×GC-TOFMS). The total relative content of 481 compounds was approximately 1.8 times higher in frost-damaged black tea than in regular black tea. The ketone and ester levels in frost-damaged black tea were approximately twice as high as that in normal black tea. Two types of black tea samples were well distinguished by a dependable PLS-DA model, which presented satisfied variance and cross-validated predictive capability (R2Y=0.997, Q2=0.956) without overfitting phenomena (R2=0.953, Q2=-0.266). One hundred eighty compounds with variable importance in the projection (VIP) values >1.0 were applied. The result of HCA analysis, esters, and alkenes were concentrated in normal black tea, and the ketones and heterocyclic compounds were concentrated in frost-damaged black tea. These results provide basic data for improving the process of producing good products using discarded leaves caused by frost damage.
Evaluation of Teachers' Views on Entrepreneurship
Authors: Özdemir Çiğdem , Bayhan Musa , Bedir Kadir , Bayhan Leman Merve , Bedir Metin
Published: October 2023

Bu çalışmanın amacı girişimcilik hakkında öğretmen görüşlerinin değerlendirilmesidir. Bu çalışmada nitel araştırma tekniklerinden fenomenoloji deseni kullanılmıştır. Araştırma için kolayda örnekleme yöntemi kullanılarak seçilen 15
öğretmen araştırmanın çalışma grubunu oluşturmuştur. Veriler yarı yapılandırılmış görüşme formu kullanılarak toplanmıştır. Verileri elde etmek için araştırmacı yüz yüze görüşmeler gerçekleştirmiştir. Veri analizinde kullanılmak
üzere, görüşme formundan toplanan ham veriler metodolojik olarak işlenmiştir. Veriler içerik analizi kullanılarak değerlendirilmiştir. Bu araştırma, öğretmenlerin girişimcilik anlayışı, kişisel girişimcilik yetkinlikleri, öğrencilere
girişimcilik becerilerini aktarma stratejileri ve öğrenci üzerindeki öğretmen girişimcilik etkisinin analizini amaçlamaktadır. Katılımcı görüşleri, girişimciliği ilerleme ve özgünlük, analitik bakış ve fırsatları tespit yeteneği,
kararlılık ve azim olmak üzere üç ana temada özetlenmiştir. Öğretmenlerin çoğunluğu kendilerini girişimci bir ruha sahip olarak değerlendirmiş, öğrencilere girişimcilik becerileri kazandırmak için proje tabanlı öğrenme, rol model
ziyaretleri ve yenilikçi öğretim metotları gibi stratejiler önermişlerdir. Ayrıca, öğretmenlerin girişimci nitelikleri, öğrencilerin girişimcilik potansiyelini olumlu bir şekilde etkilemekte ve öğrencilere yeni düşünme yetenekleri
kazandırma amacıyla örnek oluşturmaktadır.
Teachers' Views on Entrepreneurship Skills
Authors: Sün İbrahim , Sün Emine , Arslan Nurettin , Keskin Yasemin
Published: October 2023

Bu çalışmanın amacı öğretmenlerin girişimcilik becerileri konusunda görüşlerinin değerlendirilmesidir. Bu çalışmada nitel araştırma tekniklerinden fenomenoloji deseni kullanılmıştır. Araştırma için kolayda örnekleme yöntemi kullanılarak
seçilen 13 öğretmen araştırmanın çalışma grubunu oluşturmuştur. Veriler yarı yapılandırılmış görüşme formu kullanılarak toplanmıştır. Verileri elde etmek için araştırmacı yüz yüze görüşmeler gerçekleştirmiştir. Veri analizinde
kullanılmak üzere, görüşme formundan toplanan ham veriler metodolojik olarak işlenmiştir. Veriler içerik analizi kullanılarak değerlendirilmiştir. Öğretmen görüşleri, girişimcilik becerilerinin eğitimdeki önemini vurguluyor. Bu
beceriler, öğrencilerin bireysel ve profesyonel gelişimine katkı sağlamakla birlikte, yaratıcılığı, liderliği ve iletişimi içeren evrensel yetenekleri kapsıyor. Girişimcilik eğitimi, öğrencilere gelecekteki zorluklarla başa çıkma
ve adaptasyon yetileri kazandırabilirken, öğrencileri farklı alanlarda donanımlı kılma potansiyeli taşıyor. Öğrencilere kendi projelerini hayata geçirme ve özgünlük kazanma konularında da cesaretlendirici bir etkisi olabilir. Ayrıca,
öğretmenlere girişimcilik becerilerini öğretme konusunda destek ve eğitim sunulması, bu becerilerin daha etkili bir şekilde aktarılmasına yardımcı olabilir. Genel olarak, girişimcilik becerileri öğrencilere sadece iş dünyasında
değil, hayatın genelinde başarılı ve özgüvenli bireyler olma yolunda yardımcı olabilir.
Opinions of School Principals and Assistant Principals Working in Secondary Schools on Ideal Student Parents
Authors: Çelebi Cemal , Usta Orhan , Karabulut Esra , Yavuz Haci
Published: October 2023

Bu çalışmanın amacı ortaokullarda görev yapan okul müdür ve müdür yardımcılarının ideal öğrenci velisi hakkında görüşlerinin değerlendirilmesidir. Bu çalışmanın yöntemi belirlenirken nitel araştırma tekniklerinden fenomenoloji deseni
tercih edilmiştir. Araştırma grubu, amaçlı örnekleme yöntemlerinden biri olan maksimum çeşitlilik örnekleme stratejisi kullanılarak seçilmiştir. Bu yöntemle araştırmaya dahil edilen 15 okul müdür ve müdür yardımcısı araştırmanın
çalışma grubunu meydana getirmektedir. Verilerin toplanmasında yarı yapılandırılmış görüşme formu kullanılmıştır. Veriler içerik analizi kullanılarak analiz edilmiştir. Okul müdürleri ve müdür yardımcılarının değerlendirmeleri,
ideal bir öğrenci velisinden beklenen özellikleri ve veli-öğretmen-okul ilişkisinin önemini vurgulamaktadır. Velilerin sadece akademik başarıları değil, aynı zamanda öğrencilerin sosyal, duygusal ve kişisel gelişimlerini de göz
önünde bulundurmaları gerekmektedir. İyi bir iletişim ve işbirliği ortamı, öğrencilerin başarılarını etkileyebilirken, iletişim engelleri ve bu engelleri aşma stratejileri ele alınmıştır. Şiddet eğilimli velilerle başa çıkabilmek
için anlaşma dili ve dil tercümanları gibi çözüm önerileri sunulmuştur. Velilerle daha etkili iletişim sağlama stratejileri, farklı iletişim kanallarını kullanma ve özelleştirilmiş iletişim planlarını içermektedir. Empati, sabır
ve olumlu bir dil kullanmanın önemi vurgulanmıştır. Sonuç olarak, bu değerlendirmeler, okul-veli işbirliğini güçlendirmenin ve çocukların eğitimine daha olumlu bir katkı sağlamanın yollarını akademik bir perspektifle sunmaktadır.
The Role and Effectiveness of Mentoring Programs in Teachers' Professional Development
Authors: Uzunpınar Gökhan , Demiray Ömer , Gürel Özgür İbrahim , Arkadaş Bahar
Published: October 2023

Bu çalışmanın amacı öğretmenlerin mesleki gelişiminde mentörlük programlarının rolü ve etkinliğinin değerlendirilmesidir. Bu çalışmanın yöntemi belirlenirken nitel araştırma tekniklerinden fenomenoloji deseni tercih edilmiştir. Araştırma
grubu, amaçlı örnekleme yöntemlerinden biri olan maksimum çeşitlilik örnekleme stratejisi kullanılarak seçilmiştir. Bu yöntemle araştırmaya dahil edilen 12 öğretmen araştırmanın çalışma grubunu meydana getirmektedir. Verilerin
toplanmasında yarı yapılandırılmış görüşme formu kullanılmıştır. Veriler içerik analizi kullanılarak analiz edilmiştir. Öğretmenlerin ifadeleri, mentörlük programlarının öğretmenlerin mesleki gelişimine ve öğrenci başarılarına
olumlu katkı sağladığını vurgulamaktadır. Bu programlar, özellikle yeni öğretmenler için hayati bir rol oynamakta, deneyimsizliklerini aşmalarına ve öğretim becerilerini geliştirmelerine yardımcı olmaktadır. Ayrıca, mentorların
sahip olduğu deneyimler, öğretmenlere önemli konularda rehberlik yaparak öğrenci başarılarına olumlu katkıda bulunmakta ve öğretmenler arasında işbirliği kültürünü teşvik etmektedir. Mentörlük programları, öğretmenlerin motivasyonunu
artırarak, daha motive öğretmenlerin öğrencilere daha fazla çaba harcamalarını teşvik etmekte ve bu sayede öğrenci başarılarını artırmaktadır. Sonuç olarak, mentörlük programları, öğretmenlerin mesleki gelişimlerini destekleyerek
eğitim kalitesini yükseltmektedir.
Developing Standards and Indicators of Information Literacy for Mathematics
Authors:   The Korea Society Of Educational Studies In Mathematics, Kim Eun Hyun , Kim Rae Young
Published: October 2023

Information literacy is a fundamental and essential competency to live as a citizen, who is an independent and self-directed learner, in the future society. This study, as a follow-up to Kim and Kim’s research (2022a, 2022b), explores the components of information literacy for mathematics, and develops standards and indicators of literacy. Through three rounds of modified Delphi surveys and FGI, the standards and indicators of information literacy for mathematics were stabilized, and the application to practices in schools was explored. As a result, Standards 1 through 4 of information literacy for mathematics consisted of ‘cognitive thinking skills’ and ‘using physical and symbol tools’ in the personal cognitive domain, and Standard 5 was set as ‘social communication competency’ and ‘social awareness and practice competency’ in the social domain. Sixteen indicators were presented under the corresponding standards, and the relationship between competencies and standards of information literacy in mathematics was specified. This study emphasizes the key competencies of information literacy in mathematics education that are necessary for preparing individuals for future society and provides the foundation to cultivate it in school mathematics.
Change in the Contents of Early Algebra in the Korean Mathematics Curriculum
Authors:   The Korea Society Of Educational Studies In Mathematics, Choi Jisun , Na Gwisoo
Published: October 2023

This study aimed to longitudinally analyze the learning contents related to early algebra in the Korean mathematics curriculum. Curriculum documents and textbooks from the 3rd to the 2022 revised mathematics curriculum were analyzed to examine how learning contents related to early algebra were presented. As a result of this study, in terms of equivalent relationship, expression, equation, and inequality (EEEI) there was a substantial difference between the 3rd to 6th curriculum and the curriculum after the 7th, with the grades that dealt with each learning element changing greatly. In terms of generalized arithmetic (GA), it was revealed that arithmetic relationships were addressed only to the extent necessary for calculations in most curriculum. In terms of functional thinking (FT), from the 3rd to 6th curriculum, recursive patterns were not addressed, but various learning elements for covariational relationships were included. In contrast, after the 7th curriculum, recursive patterns were addressed, and learning elements related to covariational relationships were presented in an integrated manner. Based on these results, implications for future mathematics curriculum and textbooks were derived in relation to the teaching and learning of early algebra.
The Use of Technology in Korean Mathematics Education: A Systematic Review
Authors:   The Korea Society Of Educational Studies In Mathematics, Hwang Sunghwan , J J , J J
Published: October 2023

The use of educational technology has the potential to enhance teachers’ instructional quality and student achievement. The international research community has conducted various studies to address the opportunities and challenges of using technologies for teaching and learning mathematics education. However, relatively little attention has been given to identifying research topics in Korean domestic research. Therefore, the present study aims to provide a systematic literature review that identifies and compares the research topics studied nationally and internationally. The domestic literature was collected from the KCI database. We employed a topic modeling technique to analyze overall research topics and trends in technology use in mathematics education. Additionally, we compared these findings with our previous studies where we examined international research trends. This study revealed some similarities and differences in research trends between domestic and international studies and suggested implications for future studies.
A Case Study on Scaffolding to Support a Low-Achieving High School Student’s Quadratic Function Learning
Authors:   The Korea Society Of Educational Studies In Mathematics, Lee Song Hee , Lee Kyeong-Hwa
Published: October 2023

In this study, we identified a mathematics teacher’s scaffolding strategies to support a low-achieving high school students’ quadratic function learning and explored the characteristics of scaffolding used by the teacher from analytic and affective perspectives. From analytic perspective, the characteristics of scaffolding used by the teacher are as follows. First, direction setting and demonstration were used together as the main strategies of analytic scaffolding in early interactions. Second, the direction setting strategy was used to support the development of procedural fluency related to quadratic function learning. Third, by providing feedback in response to the learner's mathematical errors, the learner was able to detect his errors and correct wrong knowledge structures, and for this purpose, various affective scaffolding strategies were used together. From affective perspective, the characteristics of scaffolding used by the teacher are as follows. First, recruitment strategies were continuously used to promote the participation of the low-achieving student in mathematics learning. Second, frustration control strategies were used to minimize potential frustrations experienced by the low-achieving student. Third, it responded to the learner's partial success experience and provided social reinforcement such as recognition and praise along with feedback. As a result of learning process analysis and task-based interview conducted to find out the effect of teacher scaffolding on quadratic function learning of low-achieving student, it was confirmed that some knowledge related to quadratic function were handed over in scaffolding. From the results of the study, implications related to scaffolding for low-achieving students were discussed, and follow-up studies were proposed.
Determinan Yang Mempengaruhi Penyaluran Pembiayaan Gadai (Rahn) Pada PT. Pegadaian Syariah Indonesia Periode 2017-2021
Authors: Febriani Reni , Huzaini Moh. , Chaidir Taufiq
Published: October 2023

This study aims to analyze the influence of determinants that influence the distribution of pawn financing (Rahn) at PT. Indonesian Sharia Pawnshop for the 2017-2021 Period. The data used is quarterly data for each variable. The method used in this research is the multiple linear regression method using the Ordinary Least Square (OLS) analysis tool through the Eviews 9 program. The research results obtained are a) From the t test, the results show that partially the variables Number of Customers and Gold Price have a significant influence towards the Distribution of Pawn Financing (Rahn). Meanwhile, the Inflation Rate variable does not have a significant influence on the Distribution of Pawn Financing (Rahn); b) From the results of the f test, it was found that simultaneously the variables Number of Customers, Inflation Level and Gold Prices had a significant influence on the Distribution of Pawn Financing (Rahn); c) From the Adjusted R2 test, the results show that the variables Number of Customers, Inflation Level and Gold Price have an influence of 95.1% on the Distribution of Pawn Financing (Rahn)
Pengembangan Media Pembelajaran Kimia Mobile Learning Berbasis Android pada Materi Pokok Larutan Penyangga
Authors: Restyayulita Restyayulita , Muntari Muntari , Sofia Baiq Fara Dwirani , Loka I Nyoman
Published: October 2023

Kimia merupakan bagian dari Ilmu Pengetahuan Alam yang sangat penting untuk dipelajari. Namun, siswa masih mengalami kesulitan memahami materi karena kekurangan media untuk belajar baik di rumah maupun di sekolah, sehingga diperlukan inovasi berupa media pembelajaran yang menarik dan praktis sebagai pelengkap sumber pembelajaran yang dapat digunakan siswa dimanapun dan kapanpun, salah satunya yakni media mobile learning berbasis android. Penelitian ini bertujuan untuk menghasilkan produk dan mengetahui kelayakan media pembelajaran kimia mobile learning berbasis android ditinjau dari kevalidan dan kepraktisan pada materi pokok larutan penyangga. Metode penelitian yang digunakan adalah penelitian pengembangan (R&D) dengan menggunakan model 4-D. Subjek penelitian ini adalah siswa kelas XI MIPA 2 SMAN 3 Mataram yang berjumlah 29 siswa. Teknik pengumpulan data berupa wawancara dan angket. Hasil validitas oleh ketiga validator menggunakan indeks Aiken’s V diperoleh nilai V sebesar 0,85 dengan kriteria sangat valid untuk diujicobakan dengan nilai reliabilitas 89% (reliabel). Penilaian kepraktisan media oleh guru kimia teruji praktis dengan persentase 90% (sangat praktis) serta mendapat respon baik dari siswa kelas XI MIPA 2 dengan persentase 87% (sangat praktis). Dapat disimpulkan bahwa media mobile learning berbasis android valid dan praktis untuk digunakan dalam proses pembelajaran kimia pada materi pokok larutan penyangga.
Dekonstruksi Teologi Metafisik: Menunda Logosentrisme dalam Teologi
Authors: Tamawiwy August Corneles
Published: October 2023

Abstract. Metaphysical theology that emphasizes the ability to reach “the truth,” or what is called logocentrism, about God has succeeded in giving rise to violent deviations from religious patterns. Deviations due to this metaphysical theology also lead to a crisis within the body of the philosophy of divinity. By drawing from Jacques Derrida's thoughts on deconstruction, this paper aims to show an attempt to delay logocentrism in metaphysical theology. Deconstruction uncovers the existence of différance which suspends the dependence of theology on logos through metaphor. Metaphors do not come from the mind (logos), but imagination (terra incognita). The talk about Godhead (Theos) through metaphor postpones logocentrism which believes that metaphysics and theology are a unity that can never be separated.Abstrak. Teologi metafisik yang menekankan kemampuan untuk menggapai “kebenaran utuh,” atau yang disebut logosentrisme, tentang Allah telah berhasil melahirkan penyimpangan pola beragama yang penuh kekerasan. Penyimpangan akibat teologi metafisik ini juga berujung pada krisis di dalam tubuh filsafat ketuhanan. Dengan menimba dari pemikiran Jacques Derrida tentang dekonstruksi, tulisan ini hendak memperlihatkan sebuah upaya menunda logosentrisme dalam teologi metafisik. Dekonstruksi membuka selubung keberadaan différance yang menunda ketergantungan teologi terhadap logos melalui metafor. Metafor tidak datang dari pikiran (logos), melainkan imajinasi (terra incognita). Pembicaraan tentang Allah (Theos) melalui metafor menunda logosentrisme yang meyakini bahwa metafisika dan teologi adalah satu kesatuan yang tidak pernah terpisahkan.
Protection Of Customers for Management of Digital Banking Services (Study at PT. BRI Unit Boyolali)
Authors: Herdian Ayu Andreana Beru Tarigan  , Darminto Hartono Paulus
Published: October 2023

Increasing  competition  in  the  Indonesian  banking  industry  has  encouraged  many banks to improve the quality of services to customers by utilizing information technology developments. Service innovation in the use of information technology encourages banks to enter the era of digital banking services. However, the development of digital banking services also increases the risks faced by banks. The purpose  of  this  study  is  to  provide  an  overview  of  the  implementation  of  digital banking services and customer protection for risks from digital banking services. The method used in this study is an empirical legal research method. The results of this study indicate that the implementation of digital banking services is regulated by OJK Regulation No.12/POJK.03/2018. The existence of this OJK Regulation is expected by banks as providers of digital banking services to always prioritize risk management in the use of information technology. In addition, this study also shows the existence of 2 types of customer protection for the use of digital banking services, namely preventive protection in the form of legislation related to customer protection in the financial services sector and repressive protection in the form of bank accountability for complaints from customers using digital banking services.
El Fonca: la historia del financiamiento del arte en México en la alternancia política (1989-2020)
Authors:   Facultad de Filosofía y Letras (FFyL), Universidad Nacional Autónoma de México (UNAM), México, Mota Pérez Melissa
Published: October 2023

La creación del Fondo Nacional para la Cultura y las Artes (Fonca), en 1989, no sólo constituyó la transformación de la relación entre la comunidad artística y el Estado, sino también propició, de la mano del Consejo Nacional para la Cultura y las Artes (Conaculta), una nueva forma de concebir la política cultural en México. Este artículo analiza las bases estructurales del Fondo e identifica las modificaciones administrativas y operativas que ha tenido en la alternancia política —del Partido Revolucionario Institucional (PRI) al de Acción Nacional (PAN) y el Movimiento Regeneración Nacional (Morena)— y cómo éstas respondieron a los ideales de cada partido en el poder. Asimismo, explora el perfil neoliberal del Fondo, los motivos por los que fue posible su extinción, en 2020, y la situación actual del nuevo Sistema de Apoyos a la Creación y a Proyectos Culturales (SACPC). _______________ The creation of the Fondo Nacional para la Cultura y las Artes (Fonca) in 1989, not only represented the transformation of the relationship between the artistic community and the State, it also propitiated, together with the Consejo Nacional para la Cultura y las Artes (Conaculta), a new way of conceiving cultural policy in Mexico. This article analyzes the structural bases of Fonca and identifies the administrative and operational modifications that it had in the political alternation of PRI, PAN and Morena and how they responded to the ideals of each party. The neoliberal profile of the fund is also explored, as well as the reasons why it was extinguished in 2020 and the current situation of the new Sistema de Apoyos a la Creación y a Proyectos Culturales (SACPC).
Metodología integral para la identificación de fibras liberianas de lino y cáñamo en los soportes de pinturas novohispanas
Authors: Avelar-Carmona Ana Laura , Santos Vázquez Victor , Arroyo Lemus Elsa Minerva
Published: October 2023

Este ARTÍCULO DE INVESTIGACIÓN presenta los resultados de la aplicación de una metodología de análisis complementaria para la correcta identificación de fibras liberianas, específicamente lino y cáñamo, usadas en los soportes textiles de las pinturas de caballete. La investigación se centra en seis cuadros firmados por autores representativos de la reconocida plástica novohispana en un rango temporal amplio: último tercio del siglo XVI-final del siglo XVII. Con esta revisión discutimos las continuidades detectadas en el proceso de selección intencional de las telas para la pintura virreinal de la Nueva España. ____________ This RESEARCH ARTICLE presents the results from the application of a complementary analysis methodology for the accurate identification of Liberian fibers, specifically linen and hemp, used in the textile supports of easel paintings. The research focuses on six paintings attributed to various representative authors of New Spanish recognized plastic arts over a wide-ranging time frame spanning from the last third of the XVI century —until the end of the XVII century. During this paper we discuss the continuance detected in the process of intentional selection of canvases used for viceregal paintings in Colonial Mexico.
Viajando con Gego
Authors: Castro Julián Alejandro , Rossell Potau Xavier
Published: October 2023

Esta RESEÑA DE EXPOSICIÓN acerca de Gego: Midiendo el infinito, montada en el Museo Jumex (México), reflexiona sobre el mundo que se desarrolla detrás de ella: ¿cómo se prepara la obra?, ¿cómo llega a su exhibición?, ¿qué recorrido se hace con ella hasta inaugurarla públicamente? Así, se describen ejemplos de manipulación y exposición conservativas de dos de las obras de Gertrud Goldschmidt, Gego (Hamburgo, 1912-Caracas, 1994). En general, sus esculturas están formadas principalmente por líneas, redes y mallas gravitacionales que se entrecruzan en el vacío y modelan estructuras espaciales, cuya fragilidad, aunada al hecho de que siempre requieren un cuidado muy especial, dificulta su traslado e instalación. Se hace hincapié, por su compleja manipulación e instalación, en Reticulárea cuadrada, formada por tres elementos. También se describe la restauración curativa de la Esfera en hexaedro así como la adecuación conservativa de los embalajes de la obra, que ha permitido viajar a la exposición. ____________ This EXHIBITION REVIEW about Gego: Midiendo el infinito (Gego: Measuring Infinity), set up in the Museo Jumex (Mexico), reflects on the world that unfolds behind it: how is the artwork prepared?, how does it get to be exhibited?, what is the journey that it takes before it is opened to the public? Thus, this review presents examples of conservatory manipulation and exhibition from two of the artworks by Gertrud Goldschmidt, Gego (Hamburg, 1912-Caracas, 1994). In general, she created her sculptures mainly by using lines, networks and gravitational meshes that intersect in the void and model spatial structures, whose fragility, together with the fact that they always require to be handled with very special care, make them difficult to move and to install. This fact is highlighted, due to its complex manipulation and installation, in Retícula cuadrada (Square Reticularea), formed by three elements. In contrast, the curative restoration is described for the Esfera en hexaedro (Hexahedron Sphere), as well as the conservatory adaptation of the packaging of the work, which allows the exhibition to travel.
Partenogenetik Aktivasyonun Vitrifiye Köpek Oositleri Üzerine Etkisi
Authors: ÖZALP Rabia Gözde , ÜSTÜNER Burcu , BARİ Özge , AKTAR Ahmet , YAVUZ Ahmet , SAĞIRKAYA Hakan
Published: October 2023

Pet hayvanlarında biyoteknolojik çalışmalar son yıllarda hız kazanmaya başlamıştır. Köpeklerde başarısız yardımcı üreme teknikleriyle ilgili oluşan
sorular, muhtemelen köpek türlerinin reproduktif fizyolojisine ait yetersiz bilgiden kaynaklanmaktadır. Fakat diğer taraftan pet biyolojisindeki uygulamalar,
insan hastalıkları için model oluşturmaktadır. Bunun ötesinde gamet kriyopreservasyonunun gelişmesi, nesli tükenmekte olan türlerin
korunması ve genetik banka oluşturulması için önemlidir. Bu çalışmada, köpek oositlerindeki düşük maturasyon oranlarına rağmen, partenogenetik
aktivasyonun etkileri vitrifiye oositlerde test edildi.
Köpek oositleri, Yıldırım Belediyesi Sokak Hayvanları Bakım ve Rehabilitasyon merkezinden alınan, 20 adet sağlıklı köpekten toplandı. Ovaryumların
tekrarlı parçalanmasından sonra, seçilen COCs (kumulus oosit kompleksleri), 5% CO2 inkübatörde, mineral yağla kaplanmış 500 μl TCM-199
içeren dört-gözlü petrilerde, 39°C’de, 72 saat boyunca maturasyona bırakıldı. Maturasyondan sonra oositler, 0%, 10%, 20% etilen glikol içeren 50
ml PBl içinde sırasıyla, 10, 10 dakika ve 30 saniye muamele edildi. Oositler, 30 μl VS3 içeren kriyoviallere yerleştirilerek sıvı nitrojende donduruldu.
Bu grubun oositleri (n=257) ‘vitrifiye oosit-VO’ olarak gruplandı. Çözdürme sonrasında, oositler ionomisinle 5 dakika ve sikloheksimid ile 3 saat
muamele ederek partenogenetik aktivasyona bırakıldı. Sonrasında oositler 72 saat kültüre edilerek nükleer maturasyon değerlendirildi. Kontrol
grubu olarak kullanılan oositler (n=257), ‘non vitrifiye oosit-FO’ olarak gruplandırıldı. Maturasyondan sonra, oositler direkt olarak ionomisin ve sikloheksimid
ile muamele edilerek aktivasyona bırakıldı ve 72 saat kültüre edildi. Tüm oositler Hoechst33342 ile 30 dakika boyandıktan sonra nükleer
maturasyon oranları mikroskopta değerlendirildi.
Maturasyon oranları (MI+MII) gruplar arasında istatistiksel olarak anlamlı bulunmadı. (p>0,05). Gruplar arasında GV, GVBD, MI, ve MII oranlarında
da istatistiksel fark bulunmadı (p>0,05).
Maturasyon sonrasında, vitrifiye köpek oositlerinde partenogenetik aktivasyona bağlı nükleer değerlendirmeye çalışması bulunmamaktadır. Fakat
bu uygulamada elde edilen düşük maturasyon oranlarının, ileri moleküler çalışmalarla açıklanması gerektiği kanısındayız.
Determination of the Critical Reynolds Number in a Transitional Flow of Lime Slurry with the Addition of Deflocculant
Authors:   Kielce University of Technology, Department of Production Engineering, Al. Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland, Jaworska-Jóźwiak Beata , Bartosik Artur ,   Kielce University of Technology, Department of Production Engineering, Al. Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland
Published: October 2023

The article deals with the transportation of lime slurry from the reservoir to a settler in a chosen industrial enterprise. The slurry is non-Newtonian and viscoplastic. Such a slurry emphasises high viscosity and is difficult to transport under a high solid concentration in a pipeline. The amount of specially designed deflocculant was developed on the basis of rheological measurements. The addition of deflocculant allowed the reduction of friction in the pipeline and, as a consequence, allowed transportation with a higher solid concentration. This resulted in a decrease in the power consumption of the pump motor and significant energy savings in the slurry transport process. The paper presents the determination of the parameters of the transition from laminar to turbulent flow of lime slurry with the addition of a certain amount of deflocculant. The purpose of the investigation was to determine the critical value of the Reynolds number in the slurry flow with a volume concentration of 18.28%, 23.70% and 29.36% to determine the optimal flow conditions.
Density Wave Amplification During Hydraulic Transport: The Effect of Pipeline Design Parameters
Authors:   Royal IHC, Smitweg 6, 2961 AW, Kinderdijk, de Hoog Edwin ,   Delft University of Technology, Mekelweg 2, 2628CD, Delft, Talmon Arno ,   Delft University of Technology, Mekelweg 2, 2628CD, Delft,   Deltares, Boussinesqweg 1, 2629 HV Delft, van Rhee Cees ,   Delft University of Technology, Mekelweg 2, 2628CD, Delft
Published: October 2023

Pipelines with combined vertical and horizontal pipes can be subject to transient redistribution and accumulation of sediment, also referred to as transient density wave amplification. This process is important to understand for dredging and especially for deep sea mining applications, where a horizontally oriented jumper hose is connected to a long vertical riser. Transient accumulation could ultimately lead to pipeline blockages or pump drive failures. Density wave amplification is partly caused by a velocity difference of particles between horizontal and vertical pipes, and partly by system wide interaction between density waves and the centrifugal pump. Density wave amplification was witnessed at mixture velocities far exceeding the deposit limit velocity (de Hoog et al. 2022), and as such the stability of the pipeline cannot be predicted by designing a pipeline operating point with conventional steady-state design methods. Specifically, the conventional steady-state design methodology only considers steady-state resistance and pump curves to obtain an operating point, and aims to design the operating point above the deposit limit velocity. Transient modeling using 1D Computational Fluid Dynamics (CFD) has shown to be able to predict density wave amplification. In this article the 1D Driftflux model developed by de Hoog et al. (2022) is applied to investigate the influence of system parameters on the rate of density wave amplification. In the simulations the following system parameters are varied: pump drive characteristics, the diameter of the horizontal pipes and the application of flow feedback control.
Holdup: Its Importance in the Flow of Settling Particle-Laden Liquids
Authors:   TFJ Consulting Ltd.Derby,UK, DE23 3DX, Jones Trevor
Published: October 2023

The delayed and retained load of solids, holdup, is often overlooked as a key indicator of the characteristics of solid-liquid pipeline flow. The simplest model of the behaviour of these mixtures is the Two-Layer Model invented more than 50 years ago. At the time, researchers admitted that the model was far from perfect and invited refinements to improve stability and accuracy. Improvements and innovations have been applied to the holdup model described in the literature to make it useful and robust. The paper describes the holdup model, including a useful interpolation technique to predict the velocity for stationary deposition and the corresponding pressure gradient. The model shows that simply specifying a “safe” pumping velocity is a great over-simplification and suggests applications in a much wider context, for example in minimizing pipe wear
Towards the Assessment of the Predictive Capacity of the β-σ Two-Fluid Model for Pseudo-Homogeneous Slurry Flow in Pipes
Authors:   Dept. Civil and Environmental Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy, Yang Qi ,   Dept. Hydraulic Engineering, Tsinghua University, Shuangqing 30, 100084 Beijing, China, Messa Gianandrea V. ,   Dept. Civil and Environmental Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy, Matoušek Václav ,   Dept. Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic
Published: October 2023

This paper focuses on the numerical simulation of turbulent, pseudo-homogeneous slurry flows in pipes through the β-σ two-fluid model, developed by the authors and collaborators in previous research. The two-fluid model gives its name to the presence of two main calibration coefficients, namely, σ, associated with the turbulent dispersion of the particles, and β, related to the inter-phase friction and to the wall shear stress produced by the solid phase. In a recently published article, the role played by β and σ on different features of the CFD solution has been established for different flow conditions, and a procedure for the calibration of the two coefficients has been proposed. The present contribution investigates the extrapolability of previously calibrated coefficients to different conditions in terms of pipe diameter, particle type, and in-situ concentration. The experimental data used to support the conclusions and recommendations from the numerical study were obtained from previously published literature. The findings of this study not only contribute to a deeper comprehension of the β-σ two-fluid model, but they also provide a methodological background for the development of computational tools for industrial practitioners and academic researchers.
Solid Sediments Movement Regulating Innovative Debris Flow Elastic Barrage
Authors:   Tsotne Mirtskhulava Water Management Institute of Georgian Technical University, Gavardashvili Givi ,   Ecocenter for Environmental Protection the Organization in Category of Consultative Status with the Economic and Social Council (ECOSOC) of UN, I. Chavchavadze Ave. 60-b, 0179, Tbilisi, Kukhalashvili Eduard ,   Tsotne Mirtskhulava Water Management Institute of Georgian Technical University,   Ecocenter for Environmental Protection the Organization in Category of Consultative Status with the Economic and Social Council (ECOSOC) of UN, I. Chavchavadze Ave. 60-b, 0179, Tbilisi, Gavardashvili Natia ,   Ecocenter for Environmental Protection the Organization in Category of Consultative Status with the Economic and Social Council (ECOSOC) of UN, I. Chavchavadze Ave. 60-b, 0179, Tbilisi
Published: October 2023

Field-scientific and expeditionary studies were carried out in the White Aragvi river catchment basin in order to predict and regulate the movement of solid fractions on erosive-debris flow type rivers in the mountain landscapes of Georgia. Based on the above-mentioned research, the main hydrological, hydraulic, and energy characteristics of the movement of solid fractions in Mountain Rivers were determined. In order to regulate the volume of solid fractions transported by the debris flow, the possibilities of forceful impact on the structures are evaluated, and the reporting relationships for their evaluation are derived. The nature of the change of the lateral expansion coefficient during the movement of solid fractions in the river bed with the link currents is determined, and the possibilities of the change of the flow regimes and the movement in the channel are clarified by keeping the stationarity intact. Based on the theoretical and field-scientific studies, a methodology was developed, using which the working project of the rainwater catchment and debris flow regulating elastic dam was implemented. In the village of Kvemo Mleta, Dusheti municipality, in the riverbed of the river Mletis Khevi, 1650 m above sea level, an innovative construction of an Elastic debris flow-regulating barrage has been constructed, the scientific novelty of which is certified by Georgian patent certificate.
China’s Research and Development of Slurry Pump for Lift Marine Mineral Resources
Authors:   College of Mechanical & Vehicle Engineering, Hunan University, Changsha,410082, Hunan, P.R.China, Zou Weisheng , Zhang Haicheng ,   College of Mechanical & Vehicle Engineering, Hunan University, Changsha,410082, Hunan, P.R.China, Chen Yuheng ,   College of Mechanical & Vehicle Engineering, Hunan University, Changsha,410082, Hunan, P.R.China
Published: October 2023

The R&D of mining and lift technologies for marine mineral resources has been carried out in China since the establishment of the China Ocean Mineral Resources R&D Association (COMRA). A lift pump is the key piece of equipment in the deep-sea mining system for the transportation of seabed ore from seabed mining vehicles to surface mining vessels. The research in this paper focuses on the key equipment of a slurry pump in a hydraulic lifting system, a flow model, and the theory of pumps to lift coarse-particle slurry. It is proposed that the slurry pump used in deep-sea mining is a kind of axial and mixed flow pump with a high specific speed, high head, and backflow for coarser particles to pass through. The theories for increasing flow rate as well as equal power in the design are also introduced. Pumps with such optimized designs were all tested with slurry in the laboratory and also verified in the sea for pumping undersea mineral slurry. These theories and technologies have been applied in the design and development of a sixstage pump, and the testing results of its characteristics are also presented in this paper
An Introduction to Rov Based Intelligent Deep Sea Mining System
Authors:   College of Mechanical & Vehicle Engineering, Hunan University, Changsha,410082, Hunan, P.R.China, Zou Weisheng , Zhang Haicheng ,   College of Mechanical & Vehicle Engineering, Hunan University, Changsha,410082, Hunan, P.R.China, Chen Yuheng ,   College of Mechanical & Vehicle Engineering, Hunan University, Changsha,410082, Hunan, P.R.China
Published: October 2023

In view of difficulties existing in researches on deep-sea mining systems at home and abroad, including being stuck in seabed sediment for self-propelled deep-sea mining vehicles, uncontrollable movement of buffers, and the complications of pipeline transportation system, a remote-operated vehicle (ROV) is introduced in a new-type of intelligent deep-sea mining system, and structured the ROV-based intelligent deep-sea mining system. The components of the ROVbased intelligent deep-sea mining system, an overall concept design for it under a complex and dynamic ocean environment, are all presented in this paper.
Numerical Investigation of Particle Transport Hydrodynamics Inside a Water-Iron Sand Jet
Authors:   Zhejiang Sci-Tech University, Hangzhou, China, Xue Ling , Zhu Zuchao ,   Zhejiang Sci-Tech University, Hangzhou, China, Su Xianghui ,   Zhejiang Sci-Tech University, Hangzhou, China
Published: October 2023

In order to investigate the mechanism of multi-phase jet technology with dense particles, the device used in cleaning steel strips was elected as the research object. The dynamics of jet flow and energy transfer in two-phase solid–liquid flow is extremely intricate. Constructing mathematical models of such interactions is challenging because of the complexity of particle-toparticle and particle-to-fluid contact. In this paper, an optimized method for considering a dense discrete-phase model is proposed to accurately track the movement of dense particles. Through this approach, the study is carried out in detail from the movement of particles, the corresponding mechanism of the flow field, and the characteristics of the wear. The results indicate that this method can calculate a large number of particles and capture their dynamics accurately. The particles obtain kinetic energy from the high-pressure jet, and most of them move downstream following the main flow. However, part of these solids migrated toward the bilateral region, created by the formation and evolution of the vortex which washes or scrubs the inside of the mixture chamber. These series of movement exhibit time-averaged characteristics in terms of the number of collisions, and the average normal and tangential forces. The curve of average wear rate ranges from a no wear stage, through rapid wear stage, to a rapid and stable stage according to the inner movement of solid-liquid flows.
Effects of Heave Motion on the Dynamic Response of the Blocked Hydraulic Lifting System
Authors:   China University of Geosciences (Beijing), Beijing, China, 100083, Cao Huade ,   Key Laboratory of Polar Geology and Marine Mineral Resources（China University of Geosciences, Beijing）, Ministry of Education, Beijing, China, 100083, Yang Qiang ,   China University of Geosciences (Beijing), Beijing, China, 100083,   Key Laboratory of Polar Geology and Marine Mineral Resources（China University of Geosciences, Beijing）, Ministry of Education, Beijing, China, 100083, Xia Jianxin ,   China University of Geosciences (Beijing), Beijing, China, 100083,   Key Laboratory of Polar Geology and Marine Mineral Resources（China University of Geosciences, Beijing）, Ministry of Education, Beijing, China, 100083, Zhang Xinyu ,   China University of Geosciences (Beijing), Beijing, China, 100083,   Key Laboratory of Polar Geology and Marine Mineral Resources（China University of Geosciences, Beijing）, Ministry of Education, Beijing, China, 100083
Published: October 2023

Growing economy causes the shortage of mineral resource in the near future. The mineral resource locates at the sea bottom floor is an alternative solution. The hydraulic lifting technique is the priority option for the deep-sea mining. However, the heave motion caused by ocean wave leads to longitudinal vibration of the lifting pipe, which is also influenced by fluid structural interaction effect between the internal fluid and the pipe wall. During the longitudinal vibration, the closed end due to blockage or malfunction of the buffer will either pull or push the internal fluid that activates the pressure wave oscillation. The partitioned shell-based water hammer model is advanced to replicate the longitudinal vibration of the fluid-filled lifting pipe with one end closed. For parametric study, the frequency of the heave motion varies in the frequency range of the natural ocean wave. The masses of the lifting pump and buffer are treated as concentrated masses. Effects of concentrated masses, length of lifting pipe on the pipe dynamic response are investigated. Three resonant frequencies in the investigated range for the full scale of ocean mining lifting system are found. The first and the third resonance frequencies are identical to the frequencies of the water hammer pressure wave and the stress wave oscillation, respectively. The second resonant results from the coupling between the water hammer pressure wave and the stress wave. It also found that there is always an excited frequency a bit over the resonance frequency which depresses dynamic response of the fluid-filled lifting pipe.
The Development of an Automated Waste Segregator
Authors:   Universiti Brunei Darussalam, Azis Fatin Amanina , Suhaimi Hazwani ,   Universiti Brunei Darussalam, Abas Pg Emeroylariffion ,   Universiti Brunei Darussalam
Published: October 2023

Accumulation of waste isa major global concern,and recycling is considered one of the most effective methods to solve the problem. However, recycling requiresproper segregation of wasteaccording to waste types.This paper developsan automatic waste segregator, capable of identifying andsegregatingsix types of wastes; metal, paper, plastic, glass, cardboard, and others. The proposed systememploys Convolutional Neural Network (CNN) technology, specifically the Inception-v3 architecture, as well as two physical sensors;weight and metal sensors, to classify and segregate the waste. Overall classification accuracy of the system is 86.7%.Classificationperformance of the developed waste segregatorhas been evaluated further using the precision and recall; with high precision obtained for cardboard, metal, and other waste types, and high recall for metal and glass. Theseresults demonstrate the applicability of the developed system in effectively segregating waste at source, and thereby, reducing the need for the commonly labor-intensive segregation at waste facility. Deploying the system has the potential of reducing waste management problems by assisting recycling companies in sorting recyclablewaste, throughautomation.
Influence of Chemical Composition of Lifting Equipment Material On Their Performance
Authors:   Moscow Aviation Institute (National Research University), Amosov Alexey G. , Rozhdestvensky Oleg K. ,   Daugavpils University
Published: October 2023

The presented study refers to the use of load-handling chain slings. The theoretical calculation shows the high reliability and virtually trouble-free operation of a metal welded circuit. The introduction describes the relevance of the work and a brief historical background of the existence of this problem, as well as the terms used in the work. The next part presents a methodology for calculating the load and reliability; the quantitative values of reliability indicators, methods for obtaining them and a methodology for calculating reliability by the criterion of strength are shown. The scheme of operation of the emission spectrometer and the technology of its application are presented. In the conclusions, there are practical recommendations and coincidence of the results of the study with known facts from the materials sciences. The studies conducted by the authors demonstrate that the use of chain hangers without in-depth input control of the chemical composition of the material used can cause significantharm.