bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Lie group variational integration approach to the full discretization of a constrained geometrically exact Cosserat beam model
Authors: Hante Stefan , Tumiotto Denise , Arnold Martin 
Published: December 2021

AbstractIn this paper, we will consider a geometrically exact Cosserat beam model taking into account the industrial challenges. The beam is represented by a framed curve, which we parametrize in the configuration space $\mathbb{S}^{3}\ltimes \mathbb{R}^{3}$

S
3

⋉

R
3

with semi-direct product Lie group structure, where $\mathbb{S}^{3}$

S
3

is the set of unit quaternions. Velocities and angular velocities with respect to the body-fixed frame are given as the velocity vector of the configuration. We introduce internal constraints, where the rigid cross sections have to remain perpendicular to the center line to reduce the full Cosserat beam model to a Kirchhoff beam model. We derive the equations of motion by Hamilton’s principle with an augmented Lagrangian. In order to fully discretize the beam model in space and time, we only consider piecewise interpolated configurations in the variational principle. This leads, after approximating the action integral with second order, to the discrete equations of motion. Here, it is notable that we allow the Lagrange multipliers to be discontinuous in time in order to respect the derivatives of the constraint equations, also known as hidden constraints. In the last part, we will test our numerical scheme on two benchmark problems that show that there is no shear locking observable in the discretized beam model and that the errors are observed to decrease with second order with the spatial step size and the time step size.
Die „Fit im Nordwesten“-Toolbox
Authors: Peters Manuela , Ratz Tiara , Muellmann Saskia , Meyer Jochen , von Holdt Kai , Voelcker-Rehage Claudia , Lippke Sonia , Pischke Claudia R. 
Published: December 2021

Zusammenfassung
Hintergrund
Regelmäßige körperliche Aktivität ist von zentraler Bedeutung für gesundes Altern. Allerdings halten in Deutschland weniger als ein Viertel der ab 65-Jährigen die Aktivitätsempfehlungen der Weltgesundheitsorganisation ein.

Ziel der Arbeit
In zwei Studienphasen (PROMOTE I und II) wurden web- und print-basierte Programme zur Förderung körperlicher Aktivität älterer Erwachsener ab 60 Jahren entwickelt und mittels randomisierter Interventionsstudien analysiert und evaluiert. Ziel dieses Beitrags ist es, die daraus resultierenden Empfehlungen und Materialien, die im Rahmen einer Toolbox für Anbieter:innen von Bewegungsprogrammen im kommunalen Setting angeboten werden, vorzustellen.

Material und Methoden
Insgesamt erhielten 651 Personen über 10 Wochen Zugang zu der web- oder print-basierten „Fit im Nordwesten“-Bewegungsintervention. In der zweiten Studienphase (PROMOTE II) wurde das Programm mithilfe eines partizipativen Ansatzes an bisher inaktive Ältere angepasst. Die Zufriedenheit mit der Intervention und die Effektivität hinsichtlich des Bewegungsverhaltens wurden wissenschaftlich evaluiert.

Ergebnisse
Die „Fit im Nordwesten“-Toolbox umfasst theoriebasierte, praxisrelevante und wissenschaftlich evaluierte Handlungsempfehlungen für die Förderung der körperlichen Aktivität älterer Erwachsener ab 60 Jahren. Die bereitgestellten Dokumentensets enthalten Materialien für 1) die Vor- und Nachbereitung, 2) die Durchführung eines zehnwöchigen Bewegungsprogramms, 3) die langfristige Aufrechterhaltung des Bewegungsverhaltens und 4) die Begleitung für Theorie und Praxis.

Schlussfolgerung
Bisher existierten kaum wissenschaftlich evaluierte Materialien für die praktische Nutzung in der Bewegungsförderung. Die „Fit im Nordwesten“-Toolbox kann die zukünftige Anwendung in Bewegungsprogrammen für ältere Erwachsene unterstützen.
Längeres Arbeitslosengeld in der Krise? Covid-19 und die angemessene maximale Bezugsdauer
Authors: Osiander Christopher , Senghaas Monika , Stephan Gesine , Struck Olaf 
Published: December 2021

ZusammenfassungDieser Beitrag untersucht die Frage, welche Bezugsdauern des Arbeitslosengeldes für welche Personengruppen als angemessen betrachtet werden und ob sich diese Einschätzungen während der Covid-19-Pandemie verändert haben. Längere Bezugsdauern können die Einkommenssituation der Betroffenen stabilisieren und die Suche nach einer qualifikationsadäquaten oder besser entlohnten Stelle unterstützen. Längere Zahlungen mindern aber auch den Druck zur Arbeitsaufnahme, wodurch die Dauer der Arbeitslosigkeit zunimmt. Verändern Menschen Abwägungen zwischen individuellem Bedarf, Leistung und gesellschaftlicher Effizienz in der gesundheitlichen und ökonomischen Krise? Wir untersuchen mithilfe von Daten aus Onlinebefragungen im November 2019 und in der Krise im Mai 2020, welche Bezugsdauern (zumeist) Erwerbstätige für angemessen erachten. Dazu wurden den Teilnehmenden Vignetten mit Beschreibungen hypothetischer Arbeitsloser vorgelegt, deren Charakteristika zufällig variieren. Die Ergebnisse zeigen, dass dieselben Befragten vor und während der Krise sehr ähnliche Bezugsdauern für angemessen halten. Dabei beziehen sie bei der Bemessung der Bezugsdauer für Arbeitslose neben Beitragsprinzipien auch Kriterien der Bedürftigkeit mit ein. So beeinflussen Merkmale wie etwa das Alter der Arbeitslosen, ihr eigenes (Nicht‑)Verschulden, ihre Lebensleistungen oder die Länge ihrer Beitragszahlungen das Urteil, welche Dauer des Leistungsbezugs als angemessen angesehen wird.
Eras of Digital Entrepreneurship
Authors: Kollmann Tobias , Kleine-Stegemann Lucas , de Cruppe Katharina , Then-Bergh Christina 
Published: December 2021

AbstractWhile recent research continues to emphasize the importance of digital entrepreneurship, the historical terminology of this field is often overlooked. Digital entrepreneurship tends to be considered a new phenomenon despite emerging in the early 1990s. Building on a scoping literature review, this study analyzes 1354 publications that use nine different terms interchangeably to describe the phenomenon of digital entrepreneurship. Based on the number of publications per year, three eras in the historical development of digital entrepreneurship research are outlined. Digital technologies are identified as external enablers, and certain practical events are considered to be influencing factors. The results show that recent research has not adequately recognized the contributions of previous publications and that the understanding of digital entrepreneurship is quite similar with regard to the terms used and over time. This study shows how emerging digital technologies, such as artificial intelligence, blockchain technology, and big data analytics, might shape the future of digital entrepreneurship research. The study occupies the intersection between entrepreneurship and information systems literature and its main contribution is to provide new insights into the eras of digital entrepreneurship from the past to the present and into the future.
Flavonoids against non-physiologic inflammation attributed to cancer initiation, development, and progression—3PM pathways
Authors: Kubatka Peter , Mazurakova Alena , Samec Marek , Koklesova Lenka , Zhai Kevin , AL-Ishaq Raghad , Kajo Karol , Biringer Kamil , Vybohova Desanka , Brockmueller Aranka , Pec Martin , Shakibaei Mehdi , Giordano Frank A. , Büsselberg Dietrich , Golubnitschaja Olga 
Published: December 2021

AbstractInflammation is an essential pillar of the immune defense. On the other hand, chronic inflammation is considered a hallmark of cancer initiation and progression. Chronic inflammation demonstrates a potential to induce complex changes at molecular, cellular, and organ levels including but not restricted to the stagnation and impairment of healing processes, uncontrolled production of aggressive ROS/RNS, triggered DNA mutations and damage, compromised efficacy of the DNA repair machinery, significantly upregulated cytokine/chemokine release and associated patho-physiologic protein synthesis, activated signaling pathways involved in carcinogenesis and tumor progression, abnormal tissue remodeling, and created pre-metastatic niches, among others. The anti-inflammatory activities of flavonoids demonstrate clinically relevant potential as preventive and therapeutic agents to improve individual outcomes in diseases linked to the low-grade systemic and chronic inflammation, including cancers. To this end, flavonoids are potent modulators of pro-inflammatory gene expression being, therefore, of great interest as agents selectively suppressing molecular targets within pro-inflammatory pathways. This paper provides in-depth analysis of anti-inflammatory properties of flavonoids, highlights corresponding mechanisms and targeted molecular pathways, and proposes potential treatment models for multi-level cancer prevention in the framework of predictive, preventive, and personalized medicine (PPPM / 3PM). To this end, individualized profiling and patient stratification are essential for implementing targeted anti-inflammatory approaches. Most prominent examples are presented for the proposed application of flavonoid-conducted anti-inflammatory treatments in overall cancer management.
Determination of clay minerals using gamma ray spectroscopy for the Zubair Formation in Southern Iraq
Authors: Al-Jafar Methaq K. , Al-Jaberi Mohanad H. 
Published: December 2021

AbstractSandstone oil reserves are composed of a variety of clay minerals, including kaolinite, illite, and chlorite. These clay minerals have a significant effect of reservoir quality. The upper sandstone member (USS) of Zubair Formation is the most plentiful reservoir of the field and it’s part of a large anticline that belongs to an enormous clastic sandstone formation, from the Lower Cretaceous period. A spectral gamma-ray (SGR) log was used to identify the type of clay minerals, depositional environment, and the relationship between total organic matter with uranium concentration. SGR log indicated that USS is composed mainly of chlorite, smectite, and illite clay minerals with the presence of kaolinite as a dominant clay mineral component. Th/U ratio varies between 2.55 and 8.52 and 1.11 to 11.68 in the north and south parts of the field, respectively. The USS had a fluvially dominated, sand-rich deltaic environment based on the Th/U ratio. Furthermore, Th/K cross-plot was found that the south part was more affected by illite compared with the north part, although the presence of kaolinite.
A new green revolution or agribusiness as usual? Uncovering alignment issues and potential transition complications in agri-food system transitions
Authors: Wojtynia Niko , van Dijk Jerry , Derks Marjolein , Groot Koerkamp Peter W. G. , Hekkert Marko P. 
Published: December 2021

AbstractAgri-food system transitions are a considerable challenge requiring stakeholder alignment on what changes need to be made and how. When stakeholders do not agree on the goals or methods of a transition, this can be a serious obstacle to success. This paper analyzes 42 vision documents for the future of Dutch agriculture from a broad range of stakeholders to determine stakeholder alignment using an inductive coding approach. We identified 23 issues as the main challenges for the transition in these documents. We are the first to categorize them according to a recently proposed problem-solution space for wicked problems. Stakeholders were fully aligned in recognizing the problem for the majority of issues, but showed agreement on solutions for less than a quarter. For the issues of international orientation, sector size, and farm business models, we found a lack of consensus on the problem, indicating fundamental disagreement about the type of agricultural sector desired by stakeholders. The apparent consensus on environmental and social issues provides clear societal expectations for agronomic development and innovation, while the divergence on economic issues highlights the rift between growth-oriented paradigms and more holistic paradigms like agroecology. The crucial empirical novelty of this paper is that progress on environmental and social matters is restricted by divergent views on the economic characteristics of a future agri-food system, adding further complexity to mission-oriented transition and innovation policies.
Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks
Authors: Xue Bai , Li Yi , Cheng Ziling , Yang Shengdu , Xie Lan , Qin Shuhao , Zheng Qiang 
Published: December 2021

AbstractSome precision electronics such as signal transmitters need to not only emit effective signal but also be protected from the external electromagnetic (EM) waves. Thus, directional electromagnetic interference (EMI) shielding materials (i.e., when the EM wave is incident from different sides of the sample, the EMI shielding effectiveness (SE) is rather different) are strongly required; unfortunately, no comprehensive literature report is available on this research field. Herein, Ni-coated melamine foams (Ni@MF) were obtained by a facile electroless plating process, and multiwalled carbon nanotube (CNT) papers were prepared via a simple vacuum-assisted self-assembly approach. Then, step-wise asymmetric poly(butylene adipate-co-terephthalate) (PBAT) composites consisting of loose Ni@MF layer and compact CNT layer were successfully fabricated via a facile solution encapsulation approach. The step-wise asymmetric structures and electrical conductivity endow the Ni@MF/CNT/PBAT composites with unprecedented directional EMI shielding performances. When the EM wave is incident from Ni@MF layer or CNT layer, Ni@MF-5/CNT-75/PBAT exhibits the total EMI SE (SET) of 38.3 and 29.5 dB, respectively, which illustrates the ΔSET of 8.8 dB. This work opens a new research window for directional EMI shielding composites with step-wise asymmetric structures, which has promising applications in portable electronics and next-generation communication technologies.
Air-Stable Ultrabright Inverted Organic Light-Emitting Devices with Metal Ion-Chelated Polymer Injection Layer
Authors: Liu Shihao , Zang Chunxiu , Zhang Jiaming , Tian Shuang , Wu Yan , Shen Dong , Zhang Letian , Xie Wenfa , Lee Chun-Sing 
Published: December 2021

AbstractHere, this work presents an air-stable ultrabright inverted organic light-emitting device (OLED) by using zinc ion-chelated polyethylenimine (PEI) as electron injection layer. The zinc chelation is demonstrated to increase the conductivity of the PEI by three orders of magnitude and passivate the polar amine groups. With these physicochemical properties, the inverted OLED shows a record-high external quantum efficiency of 10.0% at a high brightness of 45,610 cd m−2 and can deliver a maximum brightness of 121,865 cd m−2. Besides, the inverted OLED is also demonstrated to possess an excellent air stability (humidity, 35%) with a half-brightness operating time of 541 h @ 1000 cd m−2 without any protection nor encapsulation.
Electrostatic Field Enhanced Photocatalytic CO2 Conversion on BiVO4 Nanowires
Authors: Yue Shuai , Chen Lu , Zhang Manke , Liu Zhe , Chen Tao , Xie Mingzheng , Cao Zhen , Han Weihua 
Published: December 2021

AbstractThe recombination loss of photo-carriers in photocatalytic systems fatally determines the energy conversion efficiency of photocatalysts. In this work, an electrostatic field was used to inhibit the recombination of photo-carriers in photocatalysts by separating photo-holes and photo-electrons in space. As a model structure, (010) facet-exposed BiVO4 nanowires were grown on PDMS-insulated piezo-substrate of piezoelectric transducer (PZT). The PZT substrate will generate an electrostatic field under a certain stress, and the photocatalytic behavior of BiVO4 nanowires is influenced by the electrostatic field. Our results showed that the photocatalytic performance of the BiVO4 nanowires in CO2 reduction in the negative electrostatic field is enhanced to 5.5-fold of that without electrostatic field. Moreover, the concentration of methane in the products was raised from 29% to 64%. The enhanced CO2 reduction efficiency is mainly attributed to the inhibited recombination loss of photo-carriers in the BiVO4 nanowires. The increased energy of photo-carriers and the enhanced surface absorption to polar molecules, which are CO in this case, were also play important roles in improving the photocatalytic activity of the photocatalyst and product selectivity. This work proposed an effective strategy to improve photo-carriers separation/transfer dynamics in the photocatalytic systems, which will also be a favorable reference for photovoltaic and photodetecting devices.
Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies
Authors: Aggarwal Nancy , Aguiar Odylio D. , Bauswein Andreas , Cella Giancarlo , Clesse Sebastian , Cruise Adrian Michael , Domcke Valerie , Figueroa Daniel G. , Geraci Andrew , Goryachev Maxim , Grote Hartmut , Hindmarsh Mark , Muia Francesco , Mukund Nikhil , Ottaway David , Peloso Marco , Quevedo Fernando , Ricciardone Angelo , Steinlechner Jessica , Steinlechner Sebastian , Sun Sichun , Tobar Michael E. , Torrenti Francisco , Ünal Caner , White Graham 
Published: December 2021

AbstractThe first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines the challenges and gains expected in gravitational-wave searches at frequencies above the LIGO/Virgo band, with a particular focus on Ultra High-Frequency Gravitational Waves (UHF-GWs), covering the MHz to GHz range. The absence of known astrophysical sources in this frequency range provides a unique opportunity to discover physics beyond the Standard Model operating both in the early and late Universe, and we highlight some of the most promising gravitational sources. We review several detector concepts that have been proposed to take up this challenge, and compare their expected sensitivity with the signal strength predicted in various models. This report is the summary of the workshop “Challenges and opportunities of high-frequency gravitational wave detection” held at ICTP Trieste, Italy in October 2019, that set up the stage for the recently launched Ultra-High-Frequency Gravitational Wave (UHF-GW) initiative.
Microfinance towards micro-enterprises development in rural Malaysia through digital finance
Authors: Jalil Muhammad Farhan 
Published: December 2021

AbstractMicrofinance is critical for the development of micro-enterprises and alleviating poverty. However, micro-enterprises are able to get microfinance services, they would face a variety of obstacles, due to the misunderstandings among many stakeholders, microfinance has not acquired widespread acceptance. Therefore, the purpose of this study is to investigate microfinance's impact on the sustainable development of Malaysia’s rural micro-enterprises. Besides, digital finance is integrated into the conceptual model to further investigate their mediating impact. Data was collected from 563 rural micro-enterprises using structured questionnaires, which were then statistically analyzed using AMOS-21. The findings of the study reveal that microfinance has a positive substantial influence on rural micro-enterprises development. Moreover, digital finance partially mediates the relationship. Thus, the study concludes that microfinance institutions are needed to adopt digital finance to enhance micro enterprises’ productivity through low transaction costs. The findings of the study can be useful to policymakers in the micro-enterprise sector who have a long-term vision and expect the sector to develop steadily. The study also provides scope and space for future academics and scholars to conduct further research.
Economic Change and Occultic Sika Bone: Market Women’s Responses to Increased Financialization in Ghana
Authors: Salifu Jovia 
Published: December 2021

AbstractSet in a context where material accumulation is valorized, this article analyzes narratives of sika bone (bad money) as expressions of economic uncertainty by market women operating in an era of increased financialization. The ethnographic evidence supports previous arguments about the impact of economic change in this millennium, a change that fosters both rationality and superstition in equal measure. Salifu proposes that sika bone indicates a sense of uncertainty fostered by economic change in the supply of cash and formal credit, a sentiment that is expressed by applying old notions about occultic means of accumulation to new and equally enigmatic circumstances.
THE HAN RIVER AS THE CENTRAL AXIS AND THE PREDOMINANCE OF WATER: QUESTIONING THE CLAIM OF “NO CHU-RELATED TRAITS” IN THE VIEW OF TERRESTRIAL SPACE IN THE RONG CHENG SHI MANUSCRIPT (FOURTH CENTURY B.C.E)
Authors: Dorofeeva-Lichtmann Vera 
Published: December 2021

AbstractThe description of the “Nine Provinces” (Jiu zhou 九州) found in the Rong Cheng shi 容成氏 (Mister Rong Cheng?, late fourth century b.c.e.) manuscript from the Shanghai Museum Bamboo Slips Collection (Shangbo cangjian 上博藏簡) is the only manuscript version of it known to date. Its discovery immediately raised the question of its relation to the cluster of descriptions on the “Nine Provinces” transmitted from the late Warring States to the early Western Han periods. There is general consensus that the manuscript description of the “Nine Provinces” has close affinity with the transmitted descriptions, as well as with a wide spectrum of transmitted early Chinese texts in general. It is distinguished by the eclectic combining of known spatial concepts, rather than manifesting any radically new or specifically Chu traits. In this study I reassess this impression with respect to the reference to the Han River in the manuscript, which up to now has been noted only in passing as an unsolved puzzle. I argue that the Han River is referred to here as the central axis that divides terrestrial space into southern and northern halves, something that implies a shifting of the mapped area to the South and thus conveys a Chu view of space. Together with philological analysis of the descriptions of terrestrial space, I apply an innovative method of investigation of these descriptions through landmarks, using as a visual aid traditional Chinese historical maps. In addition, I explore the predominance of waters as the distinguishing feature of the representation of terrestrial space in the Rong Cheng shi manuscript and demonstrate its difference from the structuring of terrestrial space proceeding from mountains to waterways to be seen in the majority of transmitted early Chinese texts.
DECORATED MODELS, REPLICATION, AND ASSEMBLY LINES FOR BRONZE INDUSTRIAL PRODUCTION IN 500 b.c.e. CHINA
Authors: Li Kin Sum (Sammy) , Wang Quanyu , Wilson J. Keith , Zhang Fan Jeremy , Cheung Jody Ho Yee , Chun Tsz Hin , Lam Sum , Pang Mingyong , Xie Haoran , Wei Mingqiang , Lee Kin San 
Published: December 2021

AbstractThis article examines the earliest examples of replication of bronze objects of complicated structure in China. It uses four quadrupeds from the Freer Gallery (National Museum of Asian Art, Smithsonian Institution), the Asian Art Museum of San Francisco, the British Museum, and the Yūrinkan Museum in Kyōto as examples to illustrate the complex technology required in replicating bronzes. It provides evidence to define identical bronzes and proves that the four quadrupeds shared the same decorated model. The application of section-mold casting, spacers, clay cores, and mold section assemblage will be examined using 3D scanning, X-ray photography, computerized tomography (CT) scanning, and alloy composition analysis.