bluuebunny/crossref_metadata_2025_split huggingface dataset:
Global stability of an age-structured population model on several temporally variable patches
Authors: Kozlov Vladimir , Radosavljevic Sonja , Tkachev Vladimir , Wennergren Uno 
Published: December 2021

AbstractWe consider an age-structured density-dependent population model on several temporally variable patches. There are two key assumptions on which we base model setup and analysis. First, intraspecific competition is limited to competition between individuals of the same age (pure intra-cohort competition) and it affects density-dependent mortality. Second, dispersal between patches ensures that each patch can be reached from every other patch, directly or through several intermediary patches, within individual reproductive age. Using strong monotonicity we prove existence and uniqueness of solution and analyze its large-time behavior in cases of constant, periodically variable and irregularly variable environment. In analogy to the next generation operator, we introduce the net reproductive operator and the basic reproduction number $$R_0$$

R
0

for time-independent and periodical models and establish the permanence dichotomy: if $$R_0\le 1$$

R
0

≤
1

, extinction on all patches is imminent, and if $$R_0>1$$

R
0

>
1

, permanence on all patches is guaranteed. We show that a solution for the general time-dependent problem can be bounded by above and below by solutions to the associated periodic problems. Using two-side estimates, we establish uniform boundedness and uniform persistence of a solution for the general time-dependent problem and describe its asymptotic behaviour.
The “springform” technique in cranioplasty: custom made 3D-printed templates for intraoperative modelling of polymethylmethacrylate cranial implants
Authors: Pöppe Johannes P. , Spendel Mathias , Schwartz Christoph , Winkler Peter A. , Wittig Jörn 
Published: December 2021

Abstract
Background
Manual moulding of cranioplasty implants after craniectomy is feasible, but does not always yield satisfying cosmetic results. In contrast, 3D printing can provide precise templates for intraoperative moulding of polymethylmethacrylate (PMMA) implants in cranioplasty. Here, we present a novel and easily implementable 3D printing workflow to produce patient-specific, sterilisable templates for PMMA implant moulding in cranioplastic neurosurgery.

Methods
3D printable templates of patients with large skull defects before and after craniectomy were designed virtually from cranial CT scans. Both templates — a mould to reconstruct the outer skull shape and a ring representing the craniectomy defect margins — were printed on a desktop 3D printer with biocompatible photopolymer resins and sterilised after curing. Implant moulding and implantation were then performed intraoperatively using the templates. Clinical and radiological data were retrospectively analysed.

Results
Sixteen PMMA implants were performed on 14 consecutive patients within a time span of 10 months. The median defect size was 83.4 cm2 (range 57.8–120.1 cm2). Median age was 51 (range 21–80) years, and median operating time was 82.5 (range 52–152) min. No intraoperative complications occurred; PMMA moulding was uneventful and all implants fitted well into craniectomy defects. Excellent skull reconstruction could be confirmed in all postoperative computed tomography (CT) scans. In three (21.4%) patients with distinct risk factors for postoperative haematoma, revision surgery for epidural haematoma had to be performed. No surgery-related mortality or new and permanent neurologic deficits were recorded.

Conclusion
Our novel 3D printing-aided moulding workflow for elective cranioplasty with patient-specific PMMA implants proved to be an easily implementable alternative to solely manual implant moulding. The “springform” principle, focusing on reconstruction of the precraniectomy skull shape and perfect closure of the craniectomy defect, was feasible and showed excellent cosmetic results. The proposed method combines the precision and cosmetic advantages of computer-aided design (CAD) implants with the cost-effectiveness of manually moulded PMMA implants.
Clipping versus coiling for aneurysmal subarachnoid hemorrhage: a systematic review and meta-analysis of prospective studies
Authors: Zhu Wenjun , Ling Xiaoxiao , Petersen Jindong Ding , Liu Jinyu , Xiao Anqi , Huang Jiayan 
Published: December 2021

AbstractNeurosurgical clipping and endovascular coiling are both standard therapies to prevent rebleeding after aneurysmal subarachnoid hemorrhage (aSAH). However, controversy still exists about which is the optimal treatment. This meta-analysis aims to assess the effectiveness and safety of two treatments with high-quality evidence. Web of Science, Cochrane Library, EMBASE, Pubmed, Sinomed, China National Knowledge Infrastructure, and Wanfang Data databases were systematically searched on August 5, 2021. Randomized controlled trials (RCTs) and prospective cohort studies that evaluated the effectiveness and safety of clipping versus coiling in aSAH patients at discharge or within 1-year follow-up period were eligible. No restriction was set on the publication date. Meta-analyses were conducted to calculate the pooled estimates and 95% confidence intervals (CI) of relative risk (RR). Eight RCTs and 20 prospective cohort studies were identified. Compared to coiling, clipping was associated with a lower rebleeding rate at discharge (RR: 0.52, 95% CI: 0.29––0.94) and a higher aneurysmal occlusion rate (RR: 1.33, 95% CI: 1.19–1.48) at 1-year follow-up. In contrast, coiling reduced the vasospasm rate at discharge (RR: 1.45, 95% CI: 1.23–1.71) and 1-year poor outcome rate (RR: 1.27, 95% CI: 1.16–1.39). Subgroup analyses presented that among patients with a poor neurological condition at admission, no statistically significant outcome difference existed between the two treatments. The overall prognosis was better among patients who received coiling, but this advantage was not significant among patients with a poor neurological condition at admission. Therefore, the selection of treatment modality for aSAH patients should be considered comprehensively.
Complex linear Diophantine fuzzy sets and their cosine similarity measures with applications
Authors: Kamacı Hüseyin 
Published: December 2021

AbstractIn this paper, the concept of complex linear Diophantine fuzzy set (CLDFS), which is obtained by integrating the phase term into the structure of the linear Diophantine fuzzy set (LDFS) and thus is an extension of LDFS, is introduced. In other words, the ranges of grades of membership, non-membership, and reference parameters in the structure of LDFS are extended from the interval [0, 1] to unit circle in the complex plane. Besides, this set approach is proposed to remove the conditions associated with the grades of complex-valued membership and complex-valued non-membership in the framework of complex intuitionistic fuzzy set (CIFS), complex Pythagorean fuzzy set (CPyFS), and complex q-rung orthopair fuzzy set (Cq-ROFS). It is proved that each of CIFS, CPyFS, and Cq-ROFS is a CLDFS, but not vice versa. In addition, some operations and relations on CLDFSs are derived and their fundamental properties are investigated. The intuitive definitions of cosine similarity measure (CSM) and cosine distance measure (CDM) between two CLDFSs are introduced and their characteristic principles are examined. An approach based on CSM is proposed to tackle medical diagnosis issues and its performance is tested by dealing with numerical examples. Finally, a comparative study of the proposed approach with several existing approaches is created and its advantages are discussed.
Influence of the particle size distribution of monomodal 316L powder on its flowability and processability in powder bed fusion
Authors: Spurek Marvin A. , Haferkamp Lukas , Weiss Christian , Spierings Adriaan B. , Schleifenbaum Johannes H. , Wegener Konrad 
Published: December 2021

AbstractPowder bed fusion (PBF) is the most commonly adopted additive manufacturing process for fabricating complex metal parts via the layer-wise melting of a powder bed using a laser beam. However, the qualification of PBF-manufactured parts remains challenging and expensive, thereby limiting the broader industrialization of the technology. Powder characteristics significantly influence part properties, and understanding the influencing factors contributes to effective quality standards for PBF. In this study, the influence of the particle size distribution (PSD) median and width on powder flowability and part properties is investigated. Seven gas-atomized SS316L powders with monomodal PSDs, a median particle size ranging from 10 μm to 60 μm, and a distribution width of 15 μm and 30 μm were analyzed and subsequently processed. The PBF-manufactured parts were analyzed in terms of density and melt pool dimensions. Although powder flowability was inversely related to the median particle size, it was unrelated to the distribution width. An inverse relationship between the median particle size and the part density was observed; however, no link was found to the distribution width. Likely, the melt pool depth and width fluctuation significantly influence the part density. The melt pool depth decreases and the width fluctuation increases with an increasing median particle size.
(Non-)convergence of solutions of the convective Allen–Cahn equation
Authors: Abels Helmut 
Published: December 2021

AbstractWe consider the sharp interface limit of a convective Allen–Cahn equation, which can be part of a Navier–Stokes/Allen–Cahn system, for different scalings of the mobility $$m_\varepsilon =m_0\varepsilon ^\theta $$

m
ε

=

m
0

ε
θ

as $$\varepsilon \rightarrow 0$$

ε
→
0

. In the case $$\theta >2$$

θ
>
2

we show a (non-)convergence result in the sense that the concentrations converge to the solution of a transport equation, but they do not behave like a rescaled optimal profile in normal direction to the interface as in the case $$\theta =0$$

θ
=
0

. Moreover, we show that an associated mean curvature functional does not converge to the corresponding functional for the sharp interface. Finally, we discuss the convergence in the case $$\theta =0,1$$

θ
=
0
,
1

by the method of formally matched asymptotics.
Anticipative Dynamic Slotting for Attended Home Deliveries
Authors: Lang Magdalena A. K. , Cleophas Catherine , Ehmke Jan Fabian 
Published: December 2021

AbstractAttended home delivery requires offering narrow delivery time slots for online booking. Given a fixed fleet of delivery vehicles and uncertainty about the value of potential future customers, retailers have to decide about the offered delivery time slots for each individual order. To this end, dynamic slotting techniques compare the reward from accepting an order to the opportunity cost of not reserving the required delivery capacity for later orders. However, exactly computing this opportunity cost means solving a complex vehicle routing and scheduling problem. In this paper, we propose and evaluate several dynamic slotting approaches that rely on an anticipatory, simulation-based preparation phase ahead of the order horizon to approximate opportunity cost. Our approaches differ in their reliance on outcomes from the preparation phase (anticipation) versus decision making on request arrival (flexibility). For the preparation phase, we create anticipatory schedules by solving the Team Orienteering Problem with Multiple Time Windows. From stochastic demand streams and problem instance characteristics, we apply learning models to flexibly estimate the effort of accepting and delivering an order request. In an extensive computational study, we explore the behavior of the proposed solution approaches. Simulating scenarios of different sizes shows that all approaches require only negligible run times within the order horizon. Finally, an empirical scenario demonstrates the concept of estimating demand model parameters from sales observations and highlights the applicability of the proposed approaches in practice.
Future aircraft concepts and design methods
Authors: McDonald Robert A. , German Brian J. , Takahashi T. , Bil C. , Anemaat W. , Chaput A. , Vos R. , Harrison N. 
Published: December 2021

AbstractWith an annual growth in travel demand of about 5% globally, managing the environmental impact is a challenge. In 2019, the International Civil Aviation Organisation (ICAO) issued emission reduction targets, including well-to-wake greenhouse gas (GHG) emissions reduced at least 50% from 2005 levels by 2050. This discusses several technologies from an aircraft design perspective that can contribute to achieving these targets. One thing is certain: aircraft will look different in the future. The Transonic Truss-Braced Wing and Flying V configurations are promising significant efficiency improvements over conventional configurations. Electric propulsion, in various architectures, is becoming a feasible option for general aviation and commuter aircraft. It will be a growing field of aviation with zero-emissions flight and opportunities for special missions. Lastly, this paper discusses methods and design processes that include all relevant disciplines to ensure that the aircraft is optimised as a complete system. While empirical methods are essential for initial design, Multidisciplinary Design Optimisation (MDO) incorporates models and simulations integrated in an optimisation environment to capture critical trade-offs. Concurrent design places domain experts in one site to facilitate collaboration, interaction, and joint decision-making, and to ensure all disciplines are equally considered. It is supported by a Collaborative Design Facility (CDF), an information technology facility with connected hardware and software tools for design analysis.
A TRIBUTE TO PROFESSOR ZHANG CHANGSHOU 張長壽 (1929–2020)
Authors: Li Feng 
Published: December 2021

AbstractZhang Changshou was one of the most important archaeologists of modern China, and a founder of Western Zhou archaeology. Zhang is particularly well known as the author of a series of works that established the chronology of the Western Zhou material culture and is esteemed for his excellent scholarship also on bronzes and jade objects, characterized by a strong basis in field archaeology. Among his academic appointments are Director of the Feng-Hao Archaeological Team in 1963–1988, and Associate Director of the Institute of Archaeology (Chinese Academy of Social Sciences) in 1985–1988. Zhang was also a pioneer of Sino-American collaboration (with Harvard University) in field archaeology and was elected a Corresponding Member of the German Archaeological Institute in 1988. Zhang passed away in Beijing on January 30, 2020. This article summarizes his academic accomplishments.
Hot topics: Denial-of-Service attacks on news websites in autocracies
Authors: Lutscher Philipp M. 
Published: December 2021

AbstractMost authoritarian countries censor the press. As a response, many opposition and independent news outlets have found refuge on the Internet. Despite the global character of the Internet, news outlets are vulnerable to censorship in cyberspace. This study investigates Denial-of-Service (DoS) attacks on news websites in Venezuela and details how news reporting is related to DoS attacks in an attempt to censor content. For this empirical test, I monitored 19 Venezuelan news websites from November 2017 until June 2018 and continuously retrieved their content and status codes to infer DoS attacks. Statistical analyses show that news content correlates to DoS attacks. In the Venezuelan context, these news topics appear to be not only on protest and repression but also on opposition actors or other topics that question the legitimacy of the regime. By establishing these relationships, this study deepens our understanding of how modern technologies are used as censorship tools.
Comparative whey proteome analysis of small-tailed Han and DairyMeade ovine milk
Authors: Bai Urhan , Su Xiaohu , Zheng Zhong , Zhang Liguo , Ma Ying , Dou Yingjie , Zhang Xiaoran , Su Guanghua , Zhou Ningcong , Li Guangpeng , Zhang Li 
Published: December 2021

AbstractWe characterized the proteome profile of mid-lactation small-tailed Han (STH) and DairyMeade (DM) ovine milk in order to explore physiological variation and differences in milk traits between the two breeds. Methodology combined a tandem mass tag (TMT) proteomic approach with LC-MS/MS technology. A total of 656 proteins were identified in STH and DM ovine milk, of which 17and 29 proteins were significantly upregulated (P < 0.05) in STH and DM, respectively. Immune-related proteins and disease-related proteins were highly expressed in STH milk, whereas S100A2 and AEBP1 were highly expressed in DM milk, which had beneficial effects on mammary gland development and milk yield. Our results provide a theoretical basis for future breeding of dairy sheep.
The Role of the Deservingness Criteria in the case of Single Mothers’ Perceived Welfare Deservingness in Hungary
Authors: HERKE BOGLÁRKA , JANKY BÉLA 
Published: December 2021

AbstractA growing number of studies investigate the relative importance of the major deservingness criteria (control, attitude, reciprocity, identity, need) in explaining the perceived welfare deservingness of different social groups. This paper addresses the roles of those criteria in predicting the perceived deservingness of a rarely examined group, single mothers. We conducted a survey in Hungary and compare the responses to direct questions about deservingness to the results of a vignette-based survey experiment in which the deservingness criteria were translated to characteristics of hypothetical mothers. Our results show that in the absence of deservingness cues (direct questions), respondents relied on the attitude, reciprocity/control, identity (measured by traditional family values), and need criteria to the same extent. On the other hand, in the presence of specific deservingness cues (vignette experiment), people disregarded their family values and stereotypes, and the perceived need became the strongest predictor of single mothers’ deservingness. These results support the existence of the deservingness heuristic, however, compared to previous literature that emphasized the role of perceived control and reciprocity of recipients, in the case of single mothers, the deservingness heuristic seems to direct people’s attention to the perception of need.
The rise of big philanthropy in global social policy: implications for policy transfer and analysis
Authors: LAMBIN ROOSA , SURENDER REBECCA 
Published: December 2021

AbstractA new group of Western development donors has emerged as increasingly influential actors in global social policy.Big philanthropieshave begun implementing social protection projects on a vast scale across the Global South and have become integrated within global governance structures. It is essential to examine whether their approach to social policy in the South is effective, legitimate and desirable for the substantive agendas and programmes in these countries and for analysis of social policy in a development context. This study investigates contemporary big philanthropies through a qualitative case-study of the Bill and Melinda Gates Foundation and its role in the health sector in Tanzania. It examines the ways in which big philanthropies engage and seek to influence policy on the ground, directly exploring the views and experiences of local stakeholders. The study finds that big philanthropies have distinctive features and mechanisms as global social policy entrepreneurs. In contrast to the vertical and linear processes associated with traditional policy transfer, a more messy and complex set of mechanisms are observed. The study also indicates that despite considerable resources and authority, philanthropic donors may not be effective in securing policy reform within aid-receiving countries due to a lack of transparency and embeddedness.
Pseudo Global Warming Sensitivity Experiments of Subtropical Cyclone Anita (2010) Under RCP 8.5 Scenario
Authors: Nakamura Ryota , Mäll Martin 
Published: December 2021

AbstractThe potential changes in the future cyclone activities around the world are important topics of discussion and research across the socio‐economic spectrum. This study investigated the subtropical cyclone (SC) Anita (2010) in the South Atlantic Ocean (SAO) under the extreme future pathway scenario RCP8.5. The study focused on thermodynamic and other dynamical changes of Anita by analyzing the storms intensity change under future background conditions. Ensemble simulations considering a combination of various physical schemes and initial conditions were carried out by using Advanced Research Weather Research and Forecasting (ARW‐WRF). The historical case runs showed agreement with the objective analysis, meeting the criteria that defines a SC. The future results show that SC Anita will become more intense and likely transition into a tropical cyclone when only considering changes in the sea surface temperature (SST). Results that considered changes both in SST and air temperature (AT) show a reduction in cyclone surface wind velocities and an increase in the minimum sea level pressure (relative to SST only). The results considering a combination of environmental changes such as SST, AT, relative humidity, geopotential height, and wind velocity show a slight increase in the cyclone intensity. These results suggest that the future conditions are favorable for the development of SCs in the SAO. In addition, the possibility for SCs to transition into tropical cyclones will have a higher occurrence of probability, leading to potentially more severe cyclone associated consequences in the SAO region.
On the Role of Density‐Driven Dissolution of CO2 in Phreatic Karst Systems
Authors: Class H. , Bürkle P. , Sauerborn T. , Trötschler O. , Strauch B. , Zimmer M. 
Published: December 2021

AbstractDensity‐driven dissolution of carbon dioxide in water is a well‐known and much described mechanism in geological sequestration of this greenhouse gas. It is remarkable that such enhanced dissolution does not receive attention in karst hydrology and speleology. Models and hypotheses on karst development are complex and consider many different processes. We focus here on the influence of CO2 partial gas pressures at the interface between atmosphere and karst water on the dynamics of dissolved CO2 concentrations below the water table. Seasonal variations of microbial soil activity and root respiration or barometric‐pressure changes cause fluctuations in CO2 partial pressures. Dependent on the existence and strength of a karst‐water background flow, fingering regimes might be triggered causing enhanced dissolution of CO2. This allows replenishment of CO2, and, thus, dissolutional power even deep in the water body without the need for percolating water to transport dissolved CO2. We present and discuss simplified and generic experimental and computational scenarios to strengthen our claim, and we try to give answers to: how much? and under which circumstances? The applied numerical model solves the Navier‐Stokes equation with water density dependent on CO2 concentration and temperature. We show that calculated CO2 mass fluxes into the water bodies are dependent on the ratio of Péclet to Rayleigh numbers (Pe/Ra) and show a local minimum around Pe/Ra = 1, i.e. when natural and forced convection are about equal. Concluding, we claim that there is sufficient reason to consider density‐driven dissolution as a process of relevance in karstification if circumstances are given.