bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and fabrication of acrylic acid treated rattan fiber epoxy composite
Authors: Behera Susanta , Mohanty Jyoti Ranjan , Nath Ganeswar 
Published: April 2023

Abstract
The present work encompasses synthesis and fabrication of short rattan fiber (1–3 mm) reinforced epoxy composite with enhanced mechanical properties. Acrylic acid has been considered as surfactant for surface modification of rattan fiber to enhance adhesion with thermosetting polymer such as epoxy. Calculation of various mechanical properties has been performed and analysed with different weight percentage of fiber matrix composition. Micrographs were studied using scanning electron microscopy. The acrylic acid treated composite shows better tensile, flexural and impact strength at 45.5 MPa, 121.89 MPa and 39.45 J m−1, respectively. Regression analysis reveals that the composite with 18% fiber content (optimum weight percentage) exhibits better mechanical properties. The results suggest that rattan fibers provide a natural and sustainable choice for reinforcing composites in a wide range of technical applications where synthetic fibres are currently utilized.
A unified perspective on some autocorrelation measures in different fields: A note
Authors: Yamada Hiroshi 
Published: April 2023

Abstract
Using notions from linear algebraic graph theory, this article provides a unified perspective on some autocorrelation measures in different fields. They are as follows: (a) Orcutt’s first serial correlation coefficient, (b) Anderson’s first circular serial correlation coefficient, (c) Moran’s

r

11

{r}_{11}

, and (d) Moran’s

I

I

. The first two are autocorrelation measures for one-dimensional data equally spaced, such as time series data, and the last two are for spatial data. We prove that (a)–(c) are a kind of (d). For example, we show that (d) such that its spatial weight matrix equals the adjacency matrix of a path graph is the same as (a). The perspective is beneficial because studying the properties of (d) leads to studying the properties of (a)–(c) at the same time. For example, the bounds of (a)–(c) can be found from the bounds of (d).
Certain Fixed Point Results On 𝔄-Metric Space Using Banach Orbital Contraction and Asymptotic Regularity
Authors: Roy Kushal , Dey Debashis , Saha Mantu 
Published: April 2023

ABSTRACT
In this paper, we investigate the existence of φ-fixed point for Banach orbital contraction over 𝔄-metric space. Also a fixed point result has been established via asymptotic regularity property over such generalized metric space. Our fixed point theorems have also been applied to the fixed circle problem. Moreover, we give some new solutions to the open problem raised by Özgür and Taş on the geometric properties of φ-fixed points of self-mappings and the existence and uniqueness of φ-fixed circles and φ-fixed discs for various classes of self-mappings.
Terahertz nanospectroscopy of plasmon polaritons for the evaluation of doping in quantum devices
Authors: Guo Xiao , He Xin , Degnan Zachary , Chiu Chun-Ching , Donose Bogdan C. , Bertling Karl , Fedorov Arkady , Rakić Aleksandar D. , Jacobson Peter 
Published: April 2023

Abstract
Terahertz (THz) waves are a highly sensitive probe of free carrier concentrations in semiconducting materials. However, most experiments operate in the far-field, which precludes the observation of nanoscale features that affect the material response. Here, we demonstrate the use of nanoscale THz plasmon polaritons as an indicator of surface quality in prototypical quantum devices properties. Using THz near-field hyperspectral measurements, we observe polaritonic features in doped silicon near a metal-semiconductor interface. The presence of the THz surface plasmon polariton indicates the existence of a thin film doped layer on the device. Using a multilayer extraction procedure utilising vector calibration, we quantitatively probe the doped surface layer and determine its thickness and complex permittivity. The recovered multilayer characteristics match the dielectric conditions necessary to support the THz surface plasmon polariton. Applying these findings to superconducting resonators, we show that etching of this doped layer leads to an increase of the quality factor as determined by cryogenic measurements. This study demonstrates that THz scattering-type scanning near-field optical microscopy (s-SNOM) is a promising diagnostic tool for characterization of surface dielectric properties of quantum devices.
Development of Mg-based metal matrix biomedical composites for acicular cruciate ligament fixation by reinforcing with rare earth oxide and hydroxyapatite – A mechanical, corrosion, and microstructural perspective
Authors: Aggarwal Divyanshu , Kumar Vinod , Sharma Siddharth 
Published: April 2023

Abstract
This study provides an insight into the synthesis of high-strength and corrosion-inhibiting Mg-based biodegradable implant material by the addition of rare earth oxide material for acicular cruciate ligament reconstruction applications. The matrix has been reinforced with a naturally occurring mineral, hydroxyapatite (Ca5(PO4)3OH) and rare earth oxide, neodymium oxide (Nd2O3), in different concentrations. The mechanical response has been assessed by analyzing the samples’ microhardness, ultimate compressive, and tensile strength. In contrast, the corrosion rates were calculated using phosphate buffer saline solution by using different techniques under suitable physiological conditions. The microstructure characterization has been carried out by field emission scanning electron microscope, electron dispersive spectroscopy, optical microscopy, and X-ray diffraction techniques. Moreover, the surface properties of the composites were assessed using surface roughness and contact angle measurements. The sample showed maximum hardness at a concentration of 1.5% rare earth oxide. Moreover, the highest ultimate compressive and tensile strength followed the same order, i.e., 1.5% > 2% > 1%. In addition, the microstructure analysis revealed a refined microstructure and the formation of secondary intermetallic phases. Resistance to dislocation and grain growth barricading were the prominent features highlighted in the study for enhanced mechanical and corrosion properties. Moreover, the hydrogen evolution was lower for Mg–HA–1.5Nd2O3 samples, which was a clear indication of a reduced corrosion rate.
Korruption, Protektion und Justiz in der Ära Adenauer
Authors: Take Gunnar 
Published: April 2023

Abstract
In der jungen Bundesrepublik wurden Weichen gestellt, welche Praktiken fortan als korrupt gelten sollten. Die „Leihwagen-Affäre“ als doppelter Bestechungs- und Justizskandal trug zu dieser Entwicklung bei. Mit Konrad Adenauer und seinem persönlichen Referenten Hans Kilb waren zentrale Akteure der Kanzlerdemokratie involviert und mit dem Leihwagengeber Daimler-Benz zudem ein Symbol des „Wirtschaftswunders“. Durch aufwändige Öffentlichkeitsarbeit wurden die im Zentrum der Macht vorgelebten Vorteilsnahmen und -gewährungen verteidigt. Dadurch verhalf man Praktiken, die stark vom Wortlaut einschlägiger Gesetze und Verordnungen abwichen, zu sozialer Akzeptanz. Möglich wurde dies nicht zuletzt durch politische Eingriffe in die Justiz.
Demokratisierung durch Wahlausschluss?
Authors: Holzhauser Thorsten , Treffenfeldt Paul 
Published: April 2023

Abstract
Der Parlamentarische Rat war 1948/49 nicht nur Verfassungsgeber, er erließ auch das Wahlgesetz zur ersten Bundestagswahl. Zu den umstrittensten Themen unter den Abgeordneten gehörte die Frage, ob nationalsozialistisch belastete Personen das volle Wahlrecht erhalten oder von der Wahl ausgeschlossen werden sollten. Die Diskussionen über den Wahlausschluss ehemaliger Nationalsozialistinnen und Nationalsozialisten sind von der Forschung bislang kaum thematisiert worden. Wie im vorliegenden Beitrag gezeigt werden soll, geben sie Aufschluss über grundlegende Fragen des zeitgenössischen Demokratieverständnisses. Sie zeigen, wie sich Diskurse um Schuld, Verantwortung und Belastung in der Nachkriegszeit mit Fragen von Demokratie und Gleichheit verbanden.
Chitosan-nanocrystal cellulose composite coating could inhibit fruit decay rate and maintain the texture parameters of fruit in okra (Abelmoschus esculentus [L.] Moench)
Authors: Wang Jiyue , Wang Heng , Liu Zhenghong , Shi Denghong , Bai Yu , Liu Yan 
Published: April 2023

In order to obtain a better preservation effect on okra fruit, this study examined chitosan (CS)–nanocrystal cellulose (NCC) composite coating as a preservative agent. Four treatments, including CS, NCC, CS–cellulose composite (CS-CC), and ratio of CS:CC: 2:1 (2CS-CC), were implemented to create three different okra fruits (Shuiguo, Naiyou, and Hibiscus coccineus). Rate of weight loss, decay rate, and texture profiles (e.g., hardness, springiness, cohesiveness, gumminess, chewiness, and resilience) of the fruits were determined regularly during storage. Our results showed that a CS-NCC composite coating could not reduce rate of weight loss of the fruits. Only 2CS-CC treatment inhibited the fruit decay rate in Hibiscus coccineus (C). Nevertheless, NCC treatment did not result in a distinct improvement compared with CS treatment (1%). CS-CC treatment could be advantageous for maintaining the texture parameters of okra fruit during storage. Notably, change in the fruit texture parameters presents a significant cultivar-dependent pattern.
Simulating the Influence of a Flow-Through Device for Milk Quality Analysis on The Flow Rate in the Milking Machine
Authors: Pavkin D. Yu. , Khakimov A. R. , Shkirin A. V. , Yurochka S. S. , Ignatenko D. N. 
Published: April 2023

The development of dairy farming proves to require technologies for rapid and non-destructive analysis of milk quality. It is noted that optical methods do not negatively aﬀect dairy products. It is noted that farms may get the desired technology by upgrading milking machines with a flow-through device for milk quality express analysis. (Research purpose) To study the eﬀect of upgrading the milking machine with a flow-through device for milk quality express analysis on the flow of the milk-air mixture in the milk hose. (Materials and methods) For this purpose the SolidWorks simulation modeling was used. Both the developed device and the simulation model are made in cylindrical geometry to ensure their compatibility with the milk hoses of 14 millimeters in diameter. The measurement took into account the angular distribution of light scattered by milk flowing inside an optically transparent cylindrical glass tube. The flow of the milk-air mixture was aﬀected only by a change in the inner diameter of the milk tubes. (Results and discussion) It is noted that the simulation model demonstrates an increase in the flow rate of the milk-air mixture in the areas of flow transition between the milk hose and the fitting (to a smaller internal diameter), as well as between the fitting and the measuring chamber of the device (to a larger internal diameter). The mirror result is recorded at the flow outlet from the measuring chamber to the nozzle and the transition from the nozzle to the milk hose. (Conclusions) It is found that the use of the device results in a 14 percent increase in the average flow rate of 0.3-0.7 meters per second. It is determined that due to the incomplete filling of the milk hose during milking, the diﬀerence in the flow rates of the milk-air mixture before and when applying the device does not have any adverse impact on the milking machine operation. The feasibility of upgrading the milking machine with a flow-through device for milk quality express analysis is proved.
Влияние атмосферного кислородо при образовании парамагнитных центров в углях
Authors: Г Шилагарди , Л Дэмбэрэл , С Эрдэнэбат , С Баясгалан , Н Норов 
Published: April 2023

Как известно, одним из важнейших гетероатомов органиской массы твердых оплив является кислород, количество которого особенно в бурых и изкоуглерфицированных каменных углях, уступает лишь углероду. В таких углях на один атом кислорода приходится в среднем 3-15 атомов углерода.
KEPRAKTISAN DAN EFEKTIVITAS ALAT PERAGA TUAS SEBAGAI MEDIA PEMBELAJARAN IPA UNTUK SISWA SMP KELAS VIII
Authors: Af'idah Noer Af'idah , Manasikana Oktaffi Arinna , Fitriyah Lina Arifah 
Published: April 2023

Guru dan siswa bukan hanya menjadi penentu keberhasilan kegiatan pembelajaran, tetapi proses pembelajaran yang efektif juga turut menentukan sukses tidaknya kegiatan pembelajaran. Salah satu faktor yang dapat mendukung proses pembelajaran agar menjadi lebih efektif adalah dengan menggunakan media pembelajaran. Pada dasarnya proses pembelajaran yang efektif tidak selalu karena media yang digunakan harus canggih, tetapi yang lebih penting adalah tergantung pada bagaimana kepraktisan dan efektivitas media pembelajaran yang dimanfaatkan. Tuas merupakan bagian dari materi pesawat sederhana yang membutuhkan media pembelajaran. Media tersebut dapat berupa alat peraga tuas yang dibuat agar siswa lebih mudah memahami konsep materi. Penelitian bertujuan untuk mengetahui kepraktisan dan efektivitas alat peraga tuas yang telah dikembangkan dengan model pengembangan ADDIE (Analyze, Design, Development, Implementation, dan Evaluation). Alat peraga tuas yang telah dikembangkan kemudian divalidasi oleh validator dan direvisi sampai dinyatakan valid. Hasil penilaian alat peraga tuas yang telah dikembangkan dinyatakan sangat valid dengan skor nilai rata-rata 94,57%. Selanjutnya alat peraga tuas diujicoba pada 16 siswa kelas VIII SMPN 1 Jombang. Dari penelitian ini didapatkan hasil penilaian kepraktisan media ditinjau dari aspek keterlaksanaan pembelajaran, maka alat peraga tuas dinyatakan sangat praktis dengan skor rata-rata sebesar 91,25%. Demikian pula penilaian kepraktisan media dari aspek respon positif siswa terhadap media, maka alat peraga tuas juga dinyatakan sangat praktis dengan skor rata-rata sebesar 90%. Adapun hasil penilaan efektivitas media ditinjau dari hasil belajar siswa ranah kognitif menyatakan bahwa alat peraga tuas sangat efektif dengan nilai rata-rata sebesar 85.
Regional Discrepancies in the Level of Knowledge-Based Economy in Poland
Authors: Bąk Iwona Dorota 
Published: April 2023

AbstractSubject and purpose of workThis paper analyzes the level of knowledge-based economy (KBE) in terms of sustainable development across the provinces (voivodships) of Poland in 2020. The underlying assumption of this study is that knowledge and skills are one of the fundamental preconditions for successfully implementing the concept of sustainable development.Materials and methodsIn order to calculate the rankings of Polish voivodships a synthetic indicator developed on the basis of the zeroed unitarization method was used.ResultsThere are vast disproportions in the levels of KBE across the voivodeships of Poland. The most advanced KBE was identified in the Mazowieckie Voivodship, and the least developed KBE was found in the Lubuskie voivodship.ConclusionsThe capacity to develop a knowledge-based economy is inextricably interrelated with the quality of the social capital, which is directly attributable to the levels of education. In order to offset the interregional disproportions spending on research and development needs to be increased and the investments in human capital (e.g. through career planning, training, improving the professional qualifications of employees, discretionary bonuses) and new technologies should be expanded.
Comparative Analysis of Methods for Hourly Electricity Demand Forecasting in the Absence of Data – A Case Study
Authors: Zawadzki Jan 
Published: April 2023

Abstract

Scope and purpose of work
This paper examines the impact of the number of gaps in data, the analytical form, and the model type selection criterion on the accuracy of interpolation and extrapolation forecasts for hourly data.

Materials and methods
Forecasts were developed on the basis of predictors that are based on: classical time series forecasting models and regression time series forecasting models, hybrid time series forecasting models and hybrid regression forecasting models for uncleared series, and exponential smoothing models for cleared series of two or three types of seasonal fluctuations, with minimum estimates of errors in interpolation or extrapolation forecasts.

Results
Adaptive and hybrid regression models have proved to have the most favorable predictive properties. Most hybrid time series models for systematic and non-systematic gaps and for both analytical forms are single models that generally describe fluctuations within a 24-hour cycle.

Conclusions
The lowest estimators of prediction errors involving interpolation were obtained for exponential smoothing models, followed by hybrid regression models. A reverse sequence was obtained for extrapolative forecasting.
Digital Sovereignty and Identity in the European Union: A Challenge for Building Europe
Authors: Ivic Sanja , Troitiño David Ramiro 
Published: April 2023

Abstract
Summary
This paper aims at showing how the concepts of national sovereignty and national identity are challenged by the digital revolution. In the age of modernism, both concepts were defined as a condition for society’s loyalty to the political framework, but this long-established format changed with the new technologic developments. The digital revolution requires a postmodern – heterogeneous and fluid – idea of identity, as well as a post-modern idea of sovereignty, which is non-territorial, neither hierarchical. Therefore, the postmodern idea of sovereignty and the concept of identity are significant for the development of the concepts of digital sovereignty and European digital identity.
The Populist Discourse of the Hungarian Prime Minister: The Case Study of Gyöngyöspata and Migration Crisis
Authors: Ismayilzada Tofig 
Published: April 2023

Abstract
The study aims to analyse if the Hungarian prime minister attempted to portray an ‘other’ image of the Roma ethnic minority group during the segregated primary school conflict in Gyöngyöspata. Moreover, the study will explore the Hungarian prime minister’s discourse on the migration crisis to understand if Viktor Orbán adopted the same communication strategy as in the Gyöngyöspata conflict. Comparing the two cases will allow us to identify the key similarities and differences in the discourse adopted by the Hungarian prime minister in different events. This research uses the qualitative content analysis methodology to examine the collected data. Besides this, the study concludes that Viktor Orbán attempted to portray an ‘other’ image of the Roma ethnic minority group during the Gyöngyöspata conflict. This study aims to fill a gap in the literature by analysing the Hungarian prime minister’s discourse on the Gyöngyöspata conflict and comparing his discourse on both cases.
Cui prodest? Why local governance came to a deadlock in Hungary
Authors: Kákai László , Kovács Ilona Pálné 
Published: April 2023

Abstract
More than thirty years after Hungary’s transition to democracy and the change of territorial governance model, the time is now right to assess the outcome. This paper is primarily an assessment, concluding that the deadlock of the Hungarian local government system can be explained not only by the centralisation efforts of the governing and opposition political elites or the continuous decline of the budgetary position, but also by the indifference of local society. The fact is that the Hungarian local governments were not protected from being squeezed out of a significant part of public services, from a narrowing of their room to manoeuvre and from their authority position being weakened, by the general constitutional provisions introduced in 1990. An important proposition of this paper is that (local) society, although still more trusting of local governments than the central government according to various surveys, has not been able to become an ‘ally’ of local governments. The question rightly posed in the title of the paper is, whose interest is the local government system, who finds the values of self ‑governance important? The paper seeks (based mainly on academic literature and on its own and secondary analyses) the reasons/changes that have led to the stalemate of Hungarian local governments despite their initially strong mandate.
What Explains Party Membership in Post-Yugoslav Countries: Socialism, Nationalism, Clientelism or False Reporting?
Authors: Čakar Dario Nikić , Čular Goran 
Published: April 2023

Abstract
Earlier studies on party membership in Central and Eastern Europe (CEE) led to the conclusion that political parties in new democracies are not inclined to build strong party organisations or invest in recruiting members. However, several recent individual country studies point to the opposite conclusions, indicating that there are significant cross ‑country variations in party membership figures across the post ‑communist region. By using a unique dataset on party membership in post ‑communist Europe, in this article we argue that the average membership level in CEE seems to be higher than in Western Europe. This holds true even when party membership figures for CEE countries are ‘corrected’ after conducting validity and reliability tests. Furthermore, we also find that party membership figures across CEE countries vary to a much higher degree than in established Western democracies. Our analysis shows that former Yugoslav countries are clustered at the top and other CEE countries at the bottom, leading to the conclusion that selection bias has been present in many studies on party membership that only included a limited number of post ‑communist countries. In order to explain higher levels of party membership in post ‑Yugoslav countries, we test three sets of explanatory variables, namely socialism, nationalism and clientelism. This exploratory study suggests that nationalist movements from the early period of transition, coupled with clientelistic politics, could serve as the most convincing explanation of high membership density in former Yugoslav countries.
Populist attitudes in Croatia: first analysis with notes on conceptualisation and measurement
Authors: Bartul Vuksan-Ćusa 
Published: April 2023

Abstract
This paper analyses individual-level populism in Croatia. Starting from the ideational definition of populism, the study tests to what extent the economic grievances, sociocultural and ideational explanations, respectively, reflect the average populism subscriber in Croatia. The analysis was made using hierarchical linear regression based on field survey data from 2020 (n=979). Results show how populism is mostly associated with authoritarianism, conspiratorial thinking and institutional (dis)trust. The economic grievances explanation has only marginal relevance, revealing that sociotropic perception is more important than the socioeconomic position of the individual. Furthermore, the study emphasises the importance of operationalising populism in accordance with the assumed structure of the concept. In the same vein, it is noted that populism on an attitudinal level should be separated from the concepts of thick ideologies. If this is not done with caution, the conclusions drawn are questionable, and the analytical contribution of populism is imprecisely determined.