bluuebunny/crossref_metadata_2025 huggingface dataset:
Rating Politics: Sovereign Credit Ratings and Democratic Choice in Prosperous Developed Countries – A Summary of the Argument
Authors: Barta Zsófia
Published: August 2024

This article summarizes the core argument of ‘Rating Politics: Sovereign Credit Ratings and Democratic Choice in Prosperous Developed Countries’, co-authored by Zsófia Barta and Alison Johnston and published by Oxford University Press. The book shows that credit rating agencies have become central actors in global governance by dint of their propensity to assign penalties and rewards to the political and policy choices of sovereign governments. It explores the logic according to which those penalties and rewards are meted out, and argues that these rewards and penalties not only constitute a violation of democratic sovereignty, but potentially undermine long-term economic growth and social and political stability, thereby also weakening countries’ long-term debt-servicing capacity.
Is the Korea Fair Trade Commission Abusing the Provision for Abuse of Superior Trading Position?: A Critical Analysis of the Act on Fair Intermediary Trade of Online Platforms
Authors: Na Youngsoog
Published: August 2024

This paper examines the economic impact of the abuse of superior trading position (ASTP) provision within Korea’s draft Act on Fair Intermediary Trade of Online Platforms (AFITOP). The AFITOP, proposed as part of competition law reform in the digital era, applies to large online platform operators providing intermediary services. While derived from the Monopoly Regulation and Fair Trade Act (MRFTA), the ASTP provision’s goal to protect the economically weak is secondary to the MRFTA’s primary goal of efficiency. Furthermore, the provision’s interpretative uncertainties burden enterprises, especially large ones and those exploring new business models. Including this provision in the AFITOP is likely to reduce innovation incentives among large online platform operators, and to foster enforcement bias toward the ASTP provision by the Korea Fair Trade Commission, thereby increasing inefficiency in competition law enforcement. Therefore, the ASTP provision in the AFITOP should not be introduced.
Rheological characteristics and seepage laws of sandstone specimens containing an inclined single fracture under three-dimensional stress
Authors: Tang Jinzhou , Tang Wenhao , Yang Ke , Yin Zhiqiang , Liu Qinjie , Duan Minke , Liu Rong
Published: August 2024

The rheological properties and seepage laws of fractured rock masses have a highly significant impact on the long-term stability of engineering rock masses. To study the rheological properties and seepage laws, rheological experiments under different loading paths were designed and conducted on sandstone samples with pre-fabricated single fractures. The results indicated that (1) as the axial stress or pore pressure increases, or the confining pressure decreases, the creep strain (both axial and radial directions) during the creep tests increases, and their stain rate decreases; (2) compared to the pore pressure, the axial stress and confining pressure have a more significant influence on the flow rate during the creep process. As the axial stress increases or the confining pressure decreases, the flow rate shows an increasing trend; (3) the higher connectivity results in higher final flow in an exponential function, indicating that the connectivity ratios can well reflect the permeability of the fractures; (4) the changes in the stress field may lead to the transition of the surrounding rock from a stable state to an unstable state, i.e., the occurrence of creep failure, or water inrush. Therefore, when the state of the surrounding rock changes, strengthened monitoring and proper preventive measures should be implemented.
Anticorrosion properties of flavonoids for rust-free building materials: a review
Authors: Verma Nishant , Kumar Tarun , Vashistha Vinod Kumar , Das Dipak Kumar , Yadav Suman , Pullabhotla Rajasekhar VSR , Sharma Gaurav
Published: August 2024

Rust-free building materials are crucial for ensuring the durability and structural stability of constructions. Corrosion, a widespread issue affecting metals like steel, copper, and concrete, can be effectively managed with the help of corrosion inhibitors. One effective method for corrosion inhibition involves the application of corrosion-inhibiting coatings, which form resilient and tightly adherent films on metal surfaces. Flavonoids, renowned for their diverse biological activities, demonstrate significant anticorrosive properties. They contain beneficial compounds such as antioxidants and chelating agents. The efficacy of plant extracts as corrosion inhibitors is influenced by their organic constituents, particularly phenols and flavonoids. Flavonoids act by creating a protective film that serves as a barrier, shielding the metal surface from corrosive agents and limiting their access to the metal. This contributes to the prevention of corrosion. The integration of flavonoids into building materials has the potential to transform corrosion prevention practices, leading to improved durability, reduced maintenance costs, and a more environmentally friendly built environment. This article explores the promising prospects of flavonoids as an innovative and sustainable approach to corrosion prevention in building materials. Additionally, it aims to stimulate further research endeavors, fostering the development of effective and eco-friendly corrosion protection strategies for the construction industry.
Filling gaps in Hardy fields
Authors: Aschenbrenner Matthias , van den Dries Lou , van der Hoeven Joris
Published: August 2024

We show how to fill “countable” gaps in Hardy fields. We use this to prove that
any two maximal Hardy fields are back-and-forth equivalent.
Characteristics and main controlling factors of dolomite reservoirs in Fei-3 Member of Feixianguan Formation of Lower Triassic, Puguang area
Authors: Wang Shenjian , Xu Guosheng , Hou Yingling , Zhuang Wenjie , Chen Guomin , Wang Wei , Wang Xinyi , Bi Jianxia , Huang Changbing , Liu Qing , Zhuang Qiuchan , Luo Qing
Published: August 2024

In recent years, studying dolomite diagenesis and controlling factors of reservoir development from microscopic perspective has become a hot subject in deep carbonate gas exploration. In this study, we have carried out a fine classification of different types of dolomite reservoirs in the Fei-3 Member of the Lower Triassic Feixianguan Formation in the Puguang area, and the distribution law and main controlling factors of dolomite reservoirs have been clarified. The results show that the dolomite reservoirs of the Fei-3 Member in the Puguang area include three rock types: residual structure dolomite, microbial dolomite, and crystalline dolomite, and the main reservoir space types are intergranular pores, solution pores/caves, and inter-crystalline pores, respectively, and the solution fractures are mainly developed in the residual structure and microbial dolomites. Most of the dolomite reservoirs are distributed in the Fei 31 sub-member, and the residual structure dolomite is mainly distributed in the relative paleomorphic highs of the Fei 31 sub-member; microbial dolomite is mainly developed in the platform environment with shallow water and intermittent exposure, and is controlled by the growth conditions of microorganisms; the crystalline dolomite is mostly distributed in the relatively shallow water and relatively limited dolomite flat environment. On the plane, the dolomite reservoirs are distributed in the form of clumps. The distribution of residual structure dolomite reservoir is controlled by paleotopography and early exposure corrosion. Microbial dolomite is formed in the microbial mat microfacies, and the distribution range of microbial mat controls the development of microbial dolomites. The diagenetic types of the dolomites in the target layer include dolomitization, dissolution, rupture, and material filling. Various kinds of pores formed by syngenetic dissolution provide channels for later buried dissolution, and organic acids formed by organic matter maturation under deep burial conditions play a crucial role in dissolution of dolomite and promote the formation of dissolution pores. In the burial stage, hydrocarbons enter the dolomite, which can effectively prevent the growth of late authigenic minerals, thus promoting the preservation of pores. The structural fracture system formed by late tectonic movement can communicate with different pore groups and improve the reservoir quality.
An improved CB-DPWM strategy with NP voltage balance and switching loss reduction for 3-L NPC converter
Authors: Li Bingyu , Du Xuhao , Fan Hui , Pang Xianhai
Published: August 2024

The three-level (3-L) neutral-point-clamped (NPC) converter has found widespread applications in various fields, due to its simple structure, low failure rate and high efficiency. However, the 3-L NPC converter suffers the issue of unbalanced neutral-point (NP) voltage due to the divided two dc-side capacitors. The large NP voltage ripple and offset Based on the detailed analysis of the effects of vectors and clamping patterns on the NP voltage, a discontinuous optimized modulation method for NPC grid-connected inverter with both low switching loss and ability to balance NP voltage is presented. By measuring NP voltage and utilizing the property that superfluous clamping patterns have opposing effects on the NP voltage, the modulation method adjusts the NP voltage with the injection of various zero sequence voltages (ZSV) into the original sinusoidal waves. The results of this study demonstrate that the CB-DPWM can control the NP voltage balanced and decrease switching loss compared to conventional DPWM and SVPWM strategies. Moreover, the CB-DPWM strategy does not need to identify sectors and subsectors or calculate dwelling times. This modulation strategy effectively suppresses low-frequency fluctuations and deviations of the NP voltage with the injection of a simple ZSV, and improves the power quality of the output voltages and currents. Compared to the traditional SVPWM scheme, the suggested CB-DPWM has a 27 % lower overall IGBT loss. Moreover, this method is implemented through carrier waves, which is simpler than modulation schemes based on space vector, greatly shortens the program running time, and is conducive to engineering implementation.
System networks as a resource in L2 writing education
Authors: Matthiessen Christian M.I.M. , Xuan Winfred Wenhui
Published: August 2024

This paper argues for the value of system networks as a diagnostic tool in L2 writing education. We report on an investigation of Chinese students learning to write in English over a period of a year in Year 9 of high school, characterizing their choices in the system of modality in different writing tasks over that period, and we also report on an extension of this investigation based on two additional sampling points, Year 12 of high school and Year 3 of university. Our findings indicate that even when we sample L2 texts from three different periods in education, the expansion in the use of the meaning potential embodied in the system of modality is quite limited – as long as we focus on texts from one register. We have also seen from Xuan’s (2015. A longitudinal study of Chinese high school students learning English based on systemic functional text analysis. The Hong Kong Polytechnic University PhD thesis) study of Year 9 writing tasks from a few different registers that there was no clear sense of progression throughout the year. The results show that careful selection and ordering of texts from registers that afford learners with complementary opportunities over time to engage with and master different parts of the resources of the system of modality can be recommended in L2 writing education.
The Netherlands’ Minimum Wage 1969–2022: Can We Learn from Decline?
Authors: Salverda Wiemer
Published: August 2024

This paper evaluates the evolution of the Dutch minimum wage since its introduction in 1969 and discusses this as an intriguing case suggesting that a deeper, economic analysis of firm and employee behaviours is required for minimum-wage analysis in general. The real level of the minimum wage has fallen tremendously after 1979, all the way back nowadays to the level of the early 1970s, due to the system of uprating and to government interventions. The minimum-wage employment share shows an even stronger decline after 1979, but, surprisingly, the share below the unchanged real minimum wage of 1979 and in bands above this has remained largely unchanged. Intriguingly, firms have continued paying the same. Composition shifts in minimum-wage employment are significant, towards larger enterprise on the demand side and towards part-time employees on the supply side. Nationally and internationally, virtually all available minimum-wage analyses of employment effects focus on rises of the minimum wage and ignore drops. However, OECD data show that declines are surprisingly frequent, making them perfectly normal economic occurrences that firms will account for. I argue that declines deserve examination in their own right, certainly also from a monopsonistic perspective. Plausibly, declines incite different responses from increases, and their analysis will require the examination of heterogeneous behaviour of both firms and employees. Such analysis will reinforce the economics of minimum-wage analysis as advocated by David Neumark and its integration in labour economics as advocated by David Card.
Blood Lines: Biopolitics, Patriarchy, Myth
Authors: Yelle Robert A.
Published: August 2024

Sacrifice is mainly a patriarchal institution. Nancy Jay argued that sacrifice serves as a ritual supplement and replacement for natural birth, and attempts to establish the dominance and priority of descent through the father over descent through the mother. I demonstrate the cogency of Jay’s analysis across a number of traditions. My focus is not on sacrificial rituals, but instead on a series of myths – Hebrew biblical, ancient Greek, and Vedic Indian – that disclose the manner in which sacrifice inhabits a continuum with a broader array of struggles for dominance within the family including, but not limited to, the contestation between patriarchy and matriarchy. In many myths, the kinship group becomes a primary metaphor, both for the competition over scarce goods, including power and authority within the family unit, and for modeling the body politic in a microcosm.
In situ stereomicroscopy chemical and color etching
Authors: Ambrož O. , Čermák J. , Jozefovič P. , Mikmeková Š.
Published: August 2024

In the field of materials analysis, chemical etching continues to play a crucial role in sample preparation, yet its approach is often more empirical. While classical metallographic methods dominate, insufficient understanding of the process creates room for innovation. To improve this situation, the development of new techniques allowing for structure observation during sample preparation is necessary. This is a critical step towards mitigating the influence of stochastic factors, thereby increasing the reliability and predictability of the outcomes. For real-time structural analysis during sample preparation, professional equipment was recently introduced. This contribution aims to verify in situ monitoring of structure during chemical etching using common laboratory equipment and a stereomicroscope with a camera and tablet. The method may encounter limitations due to the magnification and resolution capabilities of the stereomicroscope. Manipulation with a pipette and the risk of lens contamination with etchant can also be challenging. Additionally, etching in deeply dark etchants and ensuring adequate stirring of the etchant can be difficult. Nevertheless, this method offers new possibilities and can be beneficial for certain applications. To achieve a more comprehensive understanding, experiments with various materials and etchants are important to better grasp the limitations and possibilities of this innovative technique.
Titanium alloys with a high β stabilizer content – sample preparation strategies and micrographs
Authors: Siemers C. , Sternberg S. , Klinge L. , Merz E.
Published: August 2024

Owing to their specific property profile, titanium materials are particularly used in aerospace and medical technology applications. Highly β-stabilized titanium alloys are becoming more and more important for they can be strengthened by martensite decomposition and/or precipitation hardening, thus allowing the property profile to be adapted to the respective application. Not only α and β phase can occur in the respective alloys, but also the α’, α” or ω phase. The sample preparation is particularly problematic when high fractions of α” and β phase are present. They are characterized by a very low stiffness and strength, thus tending to form smear and deformation layers. Three examples will be quoted to describe the sample preparation of titanium materials with a high proportion of β-stabilizers (niobium, molybdenum, and tantalum) and various micrographs will be shown.
Microstructural changes in the welding of titanium-stabilized steels
Authors: Wanhoff D. , Schulze-Küppers F. , Bauske N. , Beßler Y. , Groß-Barsnick S. , Pauly F. , Willms H. , Natour G.
Published: August 2024

At the Central Institute for Engineering, electronics, and Analytics (ZEA-1 by its acronym in German) of the Jülich Research Center GmbH, a cryostat was developed for the European Spallation Neutron Source (ESS) and manufactured from a titanium-stabilized austenitic stainless steel alloy (EN 1.4571). After tungsten inert gas welding, the welds exhibited a black, patchy discoloration. After materialographic preparation, the phenomena were examined using microscopic methods to assess their impact on the strength of the weld and thus on the usability of the cryostat. Not only could the impact on the cryostat operation be assessed, but the formation mechanism could be elucidated and suitable measures could be outlined to avoid the black, patchy discoloration.
Examinations on small bronze items from the Hallstatt period burial ground at Mitterkirchen in Upper Austria
Authors: Haubner R. , Strobl S. , Leskovar J.
Published: August 2024

A partially destroyed burial ground from the Hallstatt period in the area of Mitterkirchen in Upper Austria was archaeologically investigated. The graves are dated to the Hallstatt C period corresponding to the 8th/7th century BC.

Two triangular-headed nails and two lamellar “Buckel” (domed bronze plates) made of Sn-bronze were available for material investigations. One of each was subjected to metallographic examinations.

The triangular-headed nail’s bronze contains about 15 wt. %Sn. The dendritic cast structure and the eutectoid phase Cu41Sn11 are clearly visible. What is noticeable is that a Cu41Sn11 layer formed in some areas of the surface.

The lamellar Buckel’s microstructure is recrystallized and exhibits only a few deformation twins. Its bronze contains about 13 wt. %Sn. Hence, only very little Cu41Sn11 is present. Elongated Cu2S precipitates indicate that the initial sheet was manufactured by fine forging.
Use of mobile metallography to assess the extent of damage to high temperature components in power plants
Authors: Scheck R. , Maile K. , Metzger K.
Published: August 2024

Microstructural replicas are used in recurrent testing of hot, pressuriszed components to detect creep damage. The test location must be representative of the damage development and subsequent component failure. Poor preparation leads to the formation of artefacts which are considered in the damage assessment. The assessment is subject to method and operator variability. When assessing the life of components based on microstructure replicas, these must be taken into account and, if necessary, extended stress calculations for the component must be used.
Classification of damping properties of fabric-reinforced flat beam-like specimens by a degree of ondulation implying a mesomechanic kinematic
Authors: Romano Marco , Ehrlich Ingo
Published: August 2024

In order to determine the influence of the ondulations in fabrics on the damping properties of fiber-reinforced plastics, the structural dynamic properties of fabric- and unidirectionally reinforced plastics are investigated. The free decay behavior of flat beam-like specimens is investigated under fixed-free boundary conditions. As the material damping is consistently higher in fabric-reinforced specimens compared to unidirectionally reinforced ones, a contribution of an additionally acting mesomechanic kinematic in fabric weaves is implied. Based on a degree of ondulation, it is possible to classify the enhancement of the material damping and determine the corresponding energy dissipation. The study provides valuable quantitative relations of the additional damping effect due to the mesomechanic kinematic. Compared to the unidirectionally reinforced material, plain weave enhances the material damping by 37…52% at

O

˜

PL

=
0.0133

{\tilde{O}}_{{\rm{PL}}}=0.0133

, whereas twill weave 2/2 enhances it by 31…40% at

O

˜

T2

=
0.0098

{\tilde{O}}_{{\rm{T2}}}=0.0098

. The consideration of the findings contributes to a deeper understanding of the visco-elastic dynamic behavior of fabric-reinforced plastics and allows further applications in research, development, and industry.
Herkunftsspezifische Unterschiede im Privatschulbesuch: Wie viel erklärt die geografische Verteilung privater Schulangebote?
Authors: Helbig Marcel , Schmitz Laura
Published: August 2024

In Deutschland ist die Zahl der Privatschulen seit 1992 erheblich gestiegen, insbesondere in Ostdeutschland. Diese Schulen werden überwiegend von SchülerInnen aus sozioökonomisch privilegierten Haushalten besucht, während Kinder aus einkommensschwachen Familien seltener vertreten sind. In diesem Beitrag untersuchen wir, ob die räumliche Verteilung der Privatschulen mit sozialen Ungleichheiten beim Privatschulbesuch im Zusammenhang steht. Hierfür schätzen wir lineare Wahrscheinlichkeitsmodelle mithilfe von georeferenzierten Daten des Sozio-oekonomischen Panels und Adressdaten aller deutschen Schulen von 2000 bis 2019. Insgesamt zeigen sich kaum Hinweise darauf, dass private Schulen vor allem dort zu finden sind, wo sozioökonomisch privilegierte Haushalte leben. Allerdings reagieren letztere in ihrer Schulwahl sensibler auf die Entfernung zu Privatschulen. Für sozial benachteiligte Gruppen spielt die Entfernung eine untergeordnete Rolle, da Privatschulen oft nicht als echte Alternative wahrgenommen werden.
Reflexão deflagrada por fotografias
Authors: Telles João A.
Published: August 2024

Fundamentado em uma nova modalidade de pesquisa qualitativa – a Pesquisa Educacional com Base nas Artes, o presente artigo enfoca a reflexão compartilhada de professores deflagrada por 29 fotografias com cenas da vida escolar que foram dadas a cinco grupos de professores. A análise das transcrições do discurso reflexivo gravado em áudio foi realizada de duas perspectivas – análise da conversação e a teoria das representações sociais. Os resultados evidenciam justificativas argumentadoras dadas pelos professores participantes enquanto compartilhavam suas construções de significados ao observar as fotos. Tais justificativas, por sua vez, me levaram ao conhecimento situado usado pelos professores e às suas representações do ensino e do desenvolvimento profissional. Da perspectiva de uma nova abordagem ao estudo do conhecimento e do desenvolvimento profissional do professor, os resultados evidenciam a peculiaridade dos objetos de arte como deflagradores de reflexão compartilhada – os professores não se restringiram aos conteúdos das fotografias, mas os estenderam em direção a outras áreas de suas experiências pessoais e profissionais, tecendo e organizando os significados que foram proporcionados pela experiência estética gerada pelas fotografias.
Graus de explicitação
Authors: Rauen Fábio José , Souza Jamille Militão de
Published: August 2024

Neste estudo de caso, com base na teoria da relevância de Sperber e Wilson (1995), analisam-se os efeitos da intervenção oral docente nos graus de explicitação da reescrita de uma produção textual por um aluno da 3ª série do ensino médio de Imbituba, Santa Catarina. A pesquisa foi organizada em três etapas: na primeira, o aluno produziu um texto, cujos graus de explicitação foram avaliados pelo docente; na segunda, houve uma intervenção oral; e, na terceira etapa, solicitou-se a reescrita desse texto. Os resultados corroboram: a) a hipótese de que a reescrita contém marcas da intervenção docente, dos ambientes cognitivos ativados nas fases anteriores e das informações inéditas advindas da elaboração do segundo texto; e b) a hipótese do aumento do grau de explicitação na reescrita. Neste artigo, aplicando-se a metodologia de Rauen (2005), esses resultados são apresentados na análise da primeira produção textual, da intervenção oral e da reescrita do aluno.
Reler Benveniste, ensinar a língua
Authors: Silva Adriana Pozzani de La Vielle e
Published: August 2024

Neste trabalho, repensamos a prática de ensino de Português, especialmente o estatuto comumente dado ao chamado “erro de Português”. Nessa direção, a teoria de Émile Benveniste serve de base para abordar a relação entre, de um lado, saber língua e, de outro, saber sobre língua. Após ler um texto escrito por L.F.Verissimo e repensar a prática docente a fim de nela inserir uma reflexão acerca da singularidade do homem na língua, indicamos algumas contribuições que um ponto de vista teórico enunciativo pode oferecer a essa atividade de ensino. Em linhas muito gerais, demonstramos o fato de que o ensino de língua não pode apagar a (inter)subjetividade inerente ao ato de colocar em funcionamento a língua.
Atividade profissional, incentivo da escola fundamental e grau de instrução da mãe
Authors: Fontana Niura Maria , Paviani Neires Maria Soldatelli , Pressanto Isabel Maria Paese
Published: August 2024

A formação do leitor é um processo de natureza sociocognitiva e cultural, envolvendo a interação de inúmeros fatores. Uma análise da relação entre fatores socioculturais e desempenho em leitura de alunos universitários primeiranistas foi realizada a partir de dados de pesquisa. Os dados foram colhidos por meio de questionário socioeconômico e cultural e de testes de leitura. Tomando por base pressupostos sociolinguísticos e socioantropológicos, o estudo procurou verificar que relações de interdependência se estabelecem entre fatores socioculturais e o desempenho desses leitores. O desempenho precário em leitura apresentou um grau elevado de associação com a variável exercer uma atividade profissional, numa amostra com 75% de alunos que trabalham. Por outro lado, o desempenho razoável em leitura apresentou um grau elevado de associação com o incentivo para ler, na escola fundamental, e com o grau de instrução materno em nível de pós-graduação.
Students’ Errors in Solving Mathematical Connection Problems on Quadrilateral Topics
Authors: Elsa Hanne Ayuningtias , Kurniati Nurdiyah , Herman Tatang
Published: August 2024

The mathematical connection ability is the ability to use the relationship of ideas in mathematics and apply mathematical ideas in contexts outside of mathematics so that’s important because it can provide opportunities for meaningful learning. The background of this study was the wrong way of students' thinking and understanding so that causing errors in solving mathematical connection problems. This study aims to describe students' errors in solving mathematical connection problems on quadrilateral topics based on the Polya’s stages. This type of study was descriptive research with a qualitative approach. The data collection technique was carried out by giving participants tests and then conducting interviews with selected participants. The participants in this study were six students in junior high school, consisting of one student in class VIII and five students in class IX. Based on the results, some participants made several types of errors on the quadrilateral topics. The errors made by the participants occurred at the stage of understanding the problem, developing a plan, and implementing the plan. Students have not been able to optimize the use of knowledge related to mathematical ideas, procedures, or facts from a quadrilateral.
KEEFEKTIFAN MODEL PEMBELAJARAN CORE BERBANTUAN POP UP BOOK TERHADAP KEMAMPUAN SISWA KELAS VIII PADA ASPEK REPRESENTASI MATEMATIS
Authors: Kusrianto Swastika Imas , Suhito Suhito , Wuryanto Wuryanto
Published: August 2024

Tujuan dari penelitian ini adalah untuk mengetahui keefektifan model pembelajaran CORE berbantuan pop up book terhadap kemampuan siswa kelas VIII pada aspek representasi matematis. Populasi dalam penelitian ini adalah siswa kelas VIII SMPN 5 Pati. Dari populasi tersebut, terambil dua kelas sampel yakni kelas eksperimen dan kontrol. Metode pengumpulan data menggunakan metode dokumentasi dan tes. Metode analisis data dilakukan menggunakan uji normalitas, uji homogenitas, uji proporsi, dan uji kesamaan dua proporsi. Hasil penelitian menunjukkan bahwa model CORE berbantuan pop up book efektif terhadap kemampuan siswa kelas VIII pada aspek representasi matematis. Hal ini ditunjukkan oleh (1) kemampuan siswa pada aspek representasi matematis yang diajarkan dengan menggunakan model CORE berbantuan pop up book dapat mencapai ketuntasan pada materi bangun ruang sisi datar kelas VIII; (2) persentase ketuntasan kemampuan siswa yang diajarkan dengan menggunakan model CORE berbantuan pop up book pada aspek representasi matematis lebih tinggi dari pada siswa yang diajarkan dengan menggunakan model TPS. Saran dari penelitian ini yaitu pada saat penelitian, jumlah pop up book yang digunakan terbatas, untuk itu perlu ditambah lagi jumlahnya supaya hasilnya lebih maksimal
Analysis of Mathematical Communication Skills and Confidence of 10th Grader of SMK in Geometry Material Viewed from Cognitive Style
Authors: Putri Elanda Laksinta , Dwijanto Dwijanto , Sugiman Sugiman
Published: August 2024

The purpose of this study were to describe the mathematical communication skills and the confidence of grade X SMK students on Van Hiele model geometry learning based on their cognitive styles. It was a qualitative descriptive research. The subjects were 2 impulsive students and 2 reflective students which were selected with MFFT instrument. The data collection techniques were mathematical communication skills tests (written and orally), interviews, documentation, attitude scale and activity observation sheets. The results showed that both written and orally, reflective students were able to meet 5 indicators of mathematical communication skills, and less meet another indicators. While, impulsive students less meet all of the mathematical communication skills indictors. The impulsive students confidence was in the medium category. In contrary, the reflective students confidence was in the high category.
The Role of Self Efficacy Towards Mathematical Problem Solving Ability in Terms of Positive Thinking Ability
Authors: Yuliyani Rahmawati , Handayani Shinta Dwi , Somawati Somawati
Published: August 2024

This research aims to know the influence of the role of self efficacy towards solving math problems in terms of positive thinking. The method used was survey methods with quantitative approach and hypothesis testing using path analysis. Large sample as many as 140 students, with sampling the sampling technique used was saturated. The results of hypothesis testing indicate that: 1) there is a significant direct influence on self efficacy against the ability of solving math problems, with the line coefficient of 0.187 and contribute directly towards the ability of self efficacy the mathematical problem solving of 3.50%. 2) there are no significant direct influence positive thinking towards mathematical problem solving ability, with the line coefficient of 0.034 and direct contribution towards positive thinking ability of solving math problems very small even barely contribute, only amounted to 0.12%. 3) there is a significant direct influence on self efficacy against positive thinking, with a coefficient of line of direct contributions and 0.181 self-efficacy (self efficacy) toward positive thinking of 3.27%. 4) there were no significant effects of self efficacy against mathematical problem solving ability through positive thinking, with the line coefficient of 0.006.
Analysis of Mathematics Literacy of Students of Mathematics Education Department Viewed from Process Components
Authors: Rusmining Rusmining
Published: August 2024

The PISA study measures the mathematical literacy of reasoning, arguing, and problem-solving skills. The research question is how the ability of mathematics literacy of mathematics education students viewed from process components. This research uses qualitative approach using documentation, observation, and interview. The results showed that 60 students or 100% were below level 1, with a score of less than 358. In the process component, communication skills obtained an average score of 3.29. Mathematising got an average score of 2.71. Representation got an average score of 3.08. Reasoning and argument got an average score of 2.54. Devising strategies for solving problems got an average score of 2.83. Using symbolic, formal and technical language and operation earned an average score of 3.16. Ability to use mathematics tools get an average score of 3.16. Based on the results of the study concluded that the literacy ability of mathematics education students viewed from the components of the process is very low.
Analysis of algebraic thinking ability viewed from the mathematical critical thinking ablity of junior high school students on problem based learning
Authors: Harti Laela Sih , Agoestanto Arief
Published: August 2024

The aims of this research are (1) find out students critical ability in learning problem based learning achieves the minimal mastery criteria; (2) find out students algebraic ability in learning problem based learning achieves the minimal mastery criteria; (3) to describe the algebraic ability of 8th grade students of SMP Negeri 6 semarang viewed by students critical ability (high, middle, and low). The method of this research is mix method with concurrent embedded design. The population in this researchwere class 8thSMP Negeri 6 Semarang The research sample was class VIII G and the subjects were taken 9 out of 34 students of class VIII G. The results of the research showed that: (1) students critical thinking ability in problem based learning achieved the minimal mastery criteria; (2) students algebraic thinking ability in problem based learning achieved the minimal mastery criteria; (3) students who belonging to the high-critical thinking ability group, have high generationaland global meta-level capabilities, while transformational capabilities that moderate to high.Studentswho belonging to the middle-critical thinking ability group, have generational, transformational, and global meta-level capabilities that tend to be moderate. Studentswho belonging to the low-critical thinking ability group, have generational and transformational capabilities that tend to be low, while global meta-level capabilities that low to moderate.
Insubordinate Space: Contents
Authors: Kalfou
Published: August 2024

None.
Who Is Speaking? An Empirical Perspective on the Acousmatic Question
Authors: Kreiman Jody
Published: August 2024

Recent empirical work has begun to consider the social, political, and biological contexts in which voice information is exploited by both speakers and listeners, making this a fruitful moment to address the points of contact between scientific thought and the critical perspectives put forth in Nina Sun Eidsheim’s The Race of Sound. In that book, voice is viewed as a “thick object” that comprises all facets of identity, including race, gender, social class, age, and many other characteristics. However, in this article I discuss the specific subcase of personal identity as indicated by a name assigned to a voice sample, or by a “same/different” judgment regarding a pair of voices. If we claim, as Eidsheim does, that voice (a thick object) is collective and cultural, deriving meaning from listeners, then how do these views from the domain of critical theory mesh with current scientific thought and empirical data about how listeners determine a speaker’s personal identity—seemingly an important facet of that thick object?
Exceeding the Visual, Eluding the Textual
Authors: Kondo Dorinne
Published: August 2024

I hope this playful(l) playlet can exemplify the rigorous fun that practice-based research can encourage. My affinity with Eidsheim’s influential text is profound; I recognize in it multiple points of alliance with the aims of anthropology (at its best), and of critical cultural studies/postcolonial and decolonial theory. It has been my own lifelong quest to destabilize conventional categories, particularly the Master Subject, “the self” and essentialized “identity,” and the many variations on this theme: the human, the body, the subject/world binary, the theory/practice binary, and now—the voice and timbre.
Mapping Complicities in Brahmin Supremacy to White Supremacy: An Unsettling of South Asia and South Asian America
Authors: Sahiba
Published: August 2024

In this article, I trace how the complicities in brahmin supremacy map onto complicities in white supremacy through the South Asian diaspora in the United States. Using my own autoethnographic accountings as a queer, oppressor-caste, low-income, non-Black, non-Indigenous, Punjabi Sikh, I explore the parallels, complexities, and incommensurabilities of class, caste, race, ethnicity, Indigeneity, religion, gender, and sexuality over transnational migrations to question who gets to claim the identities of South Asian and South Asian American, and how citizenship is negotiated within each. Tracing the logics of anti-Blackness, settler colonialism, caste supremacy, and orientalism, I analyze the ideological underpinnings that uphold brahmin supremacy and white supremacy to reveal how brahmin and white supremacy are interconnected and co-constructed.
Book Review - The Ends of Modernization: Nicaragua and the United States in the Cold War Era
Authors: Johnson Joseph
Published: August 2024

Book Review authored by Joseph Edward Johnson, History PhD student at Temple University
Interview with Dr. Robert "Bob" Vitalis
Authors: VanSise Casey
Published: August 2024

CENFAD community interview with Dr. Robert "Bob" Vitalis, Professor of Political Science at the University of Pennsylvania, concerning his book Oilcraft: The Myths of Scarcity and Security That Haunt U.S. Energy Policy (Stanford University Press, 2020)
Interview with Dr. Elizabeth R. Varon
Authors: VanSise Casey
Published: August 2024

CENFAD community interview with Dr. Elizabeth R. Varon, Langbourne M. Williams Professor of American History at the University of Virginia, concerning her book Armies of Deliverance: A New History of the Civil War (Oxford University Press, 2019)
Interview with Dr. Matthew Specter
Authors: VanSise Casey
Published: August 2024

CENFAD community interview with Dr. Matthew Specter, Senior Fellow at the Institute for European Studies at the University of California at Berkeley, concerning his book The Atlantic Realists: Empire and International Political Thought Between Germany and the United States (Stanford University Press, 2022)
Interview with Dr. Paul Adler
Authors: VanSise Casey
Published: August 2024

CENFAD community interview with Dr. Paul Adler, Assistant Professor of History at Colorado College, concerning his book No Globalization Without Representation: U.S. Activists and World Inequality (University of Pennsylvania Press, 2021)
Book Review - American Exceptionalism: A New History of an Old Idea
Authors: Dennison Graydon
Published: August 2024

Book Review authored by Graydon Dennison, History PhD candidate at Temple University
News from the CENFAD Community
Authors: Johnson Joseph
Published: August 2024

News from several members of the CENFAD community, including updates on research, upcoming publications, and other achievements.
Superiority of the computer-based approach in solving iterative open channel hydraulic problems
Authors: Yetilmezsoy Kaan
Published: August 2024

The study of engineering lays more of a focus on mathematics and analytical thinking than other academic subjects. One of the outputs required for the accreditation of programs providing this education is to train engineers who have the ability to define, formulate/solve complex engineering problems, design under realistic constraints and conditions, and select/apply appropriate analysis/modeling methods for this purpose. In particular, fluid mechanics (a discipline that focuses on the study of fluids (liquids and gases) and the forces acting on them) and hydraulics (a subfield of hydrodynamics concerned with liquid flows in pipelines and open channels) courses, which are compulsory in the environmental and civil engineering curriculum, are considered to be the basic courses of scientific/technical education. These courses play a key role in providing the basic qualifications required to meet discipline-specific criteria in the accreditation of engineering undergraduate programs. In hydraulic engineering, the design of structures related to pressurized pipe flows and open channel flows (free surface flows) requires realistic and appropriate physical and mathematical modeling studies. In this regard, much faster and more precise results can be obtained compared to conventional methods by using effective programming languages in solving complex problems modeled with mathematical expressions. This study aimed to boost the incentive for computer-based technique in basic engineering education and to highlight its significance in solving four iterative open channel hydraulic problems. The MATLAB® software was used to create computer-based solutions, and pertinent illustrations and coding information were provided in-depth for engineers, educators, and students. Moreover, student performances on midterm tests administered over the course of two consecutive semesters was evaluated in relation to manual problem solutions, and the challenges related to the traditional approach were examined within the scope of this study.
Розв’язання плоскої задачі механіки руйнування для кусково-однорідної півплощини, що стискається вздовж міжфазної приповерхневої тріщини
Authors: Богданов В.Л. , Назаренко В.М. , Кіпніс О.Л.
Published: August 2024

В роботі представлено аналітико-чисельний підхід до дослідження плоских задач про стискання кусково-однорідних напівобмежених тіл вздовж розташованих на межі поділу різних середовищ приповерхневих тріщин. Підхід розроблено в рамках тривимірної лінеаризованої теорії стійкості деформівних тіл, коли початок процесу руйнування ініціюється втратою стійкості матеріалу в локальній області біля тріщин. Вперше отримано розв’язок плоскої задачі про стиск напівобмеженого тіла (основи) з шаром покриття вздовж приповерхневої міжфазної тріщини. З використанням запису загальних розв’язків лінеаризованих рівнянь рівноваги через гармонічні потенціальні функції та застосування інтегральних розкладів Фур’є поставлену граничну задачу зведено до задачі на власні значення для системи однорідних інтегральних рівнянь Фредгольма першого роду, яка досліджується чисельно з використанням методу Бубнова—Гальоркіна. Для випадку, коли матеріал основи та покриття описуються пружним потенціалом Бартенєва—Хазановича, обчислено значення критичних параметрів, що відповідають локальній втраті стійкості матеріалу в околі тріщини на початковому етапи руйнування. Для апробації ефективності запропонованого підходу виконано порівняння значень критичних параметрів руйнування, отриманих в результаті розв’язання задачі для кусково-однорідного тіла з міжфазною тріщиною, що розглядається, зі значеннями критичних параметрів руйнування, отриманими раніше при розгляді аналогічної плоскої задачі для однорідного тіла з приповерхневою тріщиною.
Нові екологічно безпечні протикорозійні пігменти на основі монтморилоніту
Authors: Даниляк М.-О.М. , Корній С.А.
Published: August 2024

Нові екологічно безпечні протикорозійні пігменти на основі природного іонообмінного мінералу монтморилоніту, збагаченого катіонами цинку, отримано рідкофазним іонообмінним методом. Показано, що вміст цинку у модифікованому монтморилоніті зростає з підвищенням концентрації Zn(NO3)2 розчину. Електрохімічними методами встановлено, що отримані пігменти на основі модифікованого монтморилоніту покращують корозійну тривкість алюмінієвого сплаву Д16Т у середовищі кислого дощу. Найвищий протикорозійний ефект проявляє Zn-монтморилоніт, отриманий модифікацією 0,5 М розчином Zn(NO3)2. Встановлено, що ступінь захисту для сплаву Д16Т у середовищі кислого дощу з Zn- монтморилонітом становить близько 90 %.
Complicaciones en las artroplastias totales de cadera después de fracturas de acetábulo. Estudio comparativo entre cotilos convencionales y de doble movilidad
Authors: Tantera Franco
Published: August 2024

Introducción: La enfermedad degenerativa de la cadera puede desarrollarse después de una fractura de acetábulo. La artroplastia total de cadera es un procedimiento de salvataje muy utilizado que logra buenos resultados, pero que no está libre de dificultades técnicas y complicaciones.
Objetivo: Analizar los resultados clínicos y radiográficos de la artroplastia total de cadera y sus complicaciones a corto y mediano plazo, comparando componentes acetabulares de doble movilidad no cementados y cotilos convencionales no cementados.
Materiales y Métodos: Se evaluó retrospectivamente a 37 pacientes sometidos a una artroplastiatotal de cadera entre 2003 y 2022. Se analizaron los resultados clínicos y funcionales según la escala de Merle D´Aubigné; los resultados radiográficos, según los criterios modificados de Stauffer; y la estabilidad de los componentes no cementados mediante los parámetros de Engh.
Resultados: La muestra estaba compuesta por 37 pacientes (11 mujeres y 26 hombres), con una media de edad de 43.78 años. El tiempo promedio de seguimiento fue de 6.6 años. Los resultados fueron excelentes (54%), buenos (32,4%), regulares (8,1%) y malos (5,5%). Mediante la prueba exacta de Fisher, se comparó entre el tipo de cotilo empleado y el riesgo de complicaciones, y no se encontró una correlación significativa.
Conclusiones: La artroplastia total de cadera con cotilos de doble movilidad es una opción muy válida para tratar las secuelas de fracturas acetabulares, logra excelentes resultados y la tasa de complicaciones es muy baja.