bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling the forest dynamics of the Sierra Nevada under climate change using SORTIE-ND
Authors: Moran Emily V. , Vannest Nikole , Aubry-Kientz Mélaine 
Published: September 2021

Abstract
Key message
Model simulation results suggest that forests in the Sierra Nevada mountains of California will tend to increase in density and basal area in the absence of fire over the next century, and that climate change will favor increases in drought-tolerant species.

Context
Climate change is projected to intensify the natural summer drought period for Mediterranean-climate forests. Such changes may increase tree mortality, change species interactions and composition, and impact ecosystem services.

Aims
To parameterize SORTIE-ND, an individual-based, spatially explicit forest model, for forests in the Sierra Nevada, and to model forest responses to climate change.

Methods
We use 3 downscaled GCM projections (RCP 8.5) to project forest dynamics for 7 sites at different elevations.

Results
Basal area and stem density tended to increase in the absence of fire. Climate change effects differed by species, with more drought-tolerant species such as Jeffrey pine (Pinus jeffreyi A.Murray bis) and black oak (Quercus kelloggii Newb.) exhibiting increases in basal area and/or density.

Conclusion
Increasing forest density may favor carbon sequestration but could increase the risk of high-severity fires. Future analyses should include improved parameterization of reproduction and interactions of disturbance with climate effects.
Surface Oxygen Injection in Tin Disulfide Nanosheets for Efficient CO2 Electroreduction to Formate and Syngas
Authors: Chen Tao , Liu Tong , Ding Tao , Pang Beibei , Wang Lan , Liu Xiaokang , Shen Xinyi , Wang Sicong , Wu Dan , Liu Dong , Cao Linlin , Luo Qiquan , Zhang Wei , Zhu Wenkun , Yao Tao 
Published: September 2021

AbstractSurface chemistry modification represents a promising strategy to tailor the adsorption and activation of reaction intermediates for enhancing activity. Herein, we designed a surface oxygen-injection strategy to tune the electronic structure of SnS2 nanosheets, which showed effectively enhanced electrocatalytic activity and selectivity of CO2 reduction to formate and syngas (CO and H2). The oxygen-injection SnS2 nanosheets exhibit a remarkable Faradaic efficiency of 91.6% for carbonaceous products with a current density of 24.1 mA cm−2 at −0.9 V vs RHE, including 83.2% for formate production and 16.5% for syngas with the CO/H2 ratio of 1:1. By operando X-ray absorption spectroscopy, we unravel the in situ surface oxygen doping into the matrix during reaction, thereby optimizing the Sn local electronic states. Operando synchrotron radiation infrared spectroscopy along with theoretical calculations further reveals that the surface oxygen doping facilitated the CO2 activation and enhanced the affinity for HCOO* species. This result demonstrates the potential strategy of surface oxygen injection for the rational design of advanced catalysts for CO2 electroreduction.
Impact of COVID-19 on digital medical education: compatibility of digital teaching and examinations with integrity and ethical principles
Authors: Egarter Saskia , Mutschler Anna , Brass Konstantin 
Published: September 2021

AbstractThe COVID-19 (coronavirus disease 2019) pandemic in 2020 has had a lasting impact on all areas of personal life. However, the political, economic, legal and healthcare system, as well as the education system have also experienced the effects. Universities had to face new challenges and requirements in teaching and examinations as quickly as possible in order to be able to guarantee high-quality education for their students.This study aims to examine how the German-speaking medical faculties of the Umbrella Consortium of Assessment Network (UCAN) have dealt with the challenges but also the opportunities that the outbreak of the COVID-19 pandemic created in medical education and whether digitalisation has been driven forward as a result. In an initial online-survey we focused our questions on the current teaching situation with regard to digitised teaching content, the support or establishment of adequate framework conditions by the medical faculties and IT facilities and also the execution of examinations during the summer semester 2020.Between August and September 2020, a total of 88 examiners, educators, dean of study and/or technical admins from 32 partner faculties took part in the survey. Students were not included in our survey. Most respondents stated that a switch to a digital semester had worked, the use of e-learning increased compared to previous semesters and that most courses could be converted, with the exception of practical courses, which were largely cancelled. The respondents also indicated that most examinations could still be taken, with the exception of practical examination formats, like Objective Structured Clinical Examinations (OSCEs). However, in the case of face-to-face examinations, strict distance and hygiene conditions had to be obeyed or there had to be a switch to distance-online examinations, which raised many open issues such as equal opportunities of students (technical equipment, internet access, premises) and attempts at deception (third-party help with the exam, mutual exchange between students, web search).In conclusion, we identified several issues regarding the rapid transition to a digital semester due to COVID-19 which were categorised into the following topics: Face-to-face teaching could not take place, (2) know-how of educators, (3) integrity aspects, (4) technical aspects, (5) additional personnel required, (6) additional time and effort required for implementation of digital teaching. Our study shows that a switch to digital teaching and distance online examinations is feasible, but many problems were encountered concerning academic integrity and basic ethical principles still need to be solved. In order to investigate whether above mentioned issued could be solved one year after the transition to a digital semester, we conducted a second survey in which the 32 initially surveyed institutions were questioned again.
A morphological history of urban centers in Qingdao
Authors: Wang Haofeng , Rao Xiaojun 
Published: September 2021

AbstractThis study applies space syntax methodology and investigates the centrality process of four centers in Qingdao, China, which grow from old settlements during successive phases of urban growth. The aim is to increase the understanding of how urban form can generate and sustain centers as well as embed them in, or distinguish them from their context that has been built up in a rather complex geographic region. Results reveal the development of these centers and the associated different scales of accessibility are related to both pre-urban road network of the city and the local grid conditions of those settlements from which a center has grown. The overall condition of the city frames the global structure of the city and renders those settlements with potentials for movement-engaged activities. The local grid structure set by metric and topo-geometric properties influences the actual concentration patterns of social economic activities and determines the range and strength of a center in the city. The study suggests that the morphological structure of the city may be historical in nature, in the sense that old settlements are not simply “absorbed” by urban growth, but can sustain or even function as a center given proper spatial environment.
Are agricultural support policies harmful to the environment? Evidence from Japanese farm-level policy simulation
Authors: Sasaki Hiroki , Katayama Naoki , Okubo Satoru 
Published: September 2021

AbstractThis study presents the environmental impacts of agricultural policy instruments as evidence from anex-antefarm-level policy simulation model in Japan. Simulations did indicate that all types of agri-environmental payments achieved the environmental benefit for the land studied. Conversely, market price support does not inevitably increase nitrogen runoff or greenhouse gas emissions at any time since paddy fields themselves have the function of purifying water pollution and work as a biodiversity nursery. The direction and magnitude of the policy impacts are an empirical matter that should be considered carefully at a local level.
Assessing the performance and accuracy of invasive plant habitat suitability models in detecting new observations in Wisconsin
Authors: Jorgensen Niels , Renz Mark 
Published: September 2021

AbstractLand managers require tools that improve understanding of suitable habitat for invasive plants and that can be incorporated into survey efforts to improve efficiency. Habitat suitability models (HSMs) contain attributes that can meet these requirements, but it is not known how well they perform, as they are rarely field-tested for accuracy. We developed ensemble HSMs in the state of Wisconsin for 15 species using five algorithms (boosted regression trees, generalized linear models, multivariate regression splines, MaxEnt, and random forests), evaluated performance, determined variables that drive suitability, and tested accuracy. All models had good model performance during the development phase (Area Under the Curve [AUC] > 0.7 and True Skills Statistic [TSS] > 0.4). While variable importance and directionality was species specific, the most important predictor variables across all of the species’ models were mean winter minimum temperatures, total summer precipitation, and tree canopy cover. Post model development, we obtained 5,005 new occurrence records from community science observations for all 15 focal species to test the models’ abilities to accurately predict results. Using a correct classification rate of 80%, just 8 of the 15 species correctly predicted suitable habitat (α ≤ 0.05). Exploratory analyses found the number of reporters of these new data and the total number of new occurrences reported per species contributed to increasing correct classification. Results suggest that while some models perform well on evaluation metrics, relying on these metrics alone is not sufficient and can lead to errors when utilized for surveying. We recommend any model should be tested for accuracy in the field before use to avoid this potential issue.
Simulated trampling by cattle negatively impacts invasive yellow-flag iris (Iris pseudacorus) when submerged
Authors: Stoneburner Alex L. , Meiman Paul J. , Ocheltree Troy W. , Nissen Scott J. , Bradfield Scott J. 
Published: September 2021

AbstractYellow-flag iris (Iris pseudacorus L.) is a nonnative, invasive wetland plant that disrupts riparian ecosystem processes and is widely distributed across the United States and Canada. Due to its physiological and morphological characteristics, I. pseudacorus has the capacity to exclude native vegetation and form extensive monocultures in both lotic and lentic wetland systems. Methods commonly used to manage I. pseudacorus include manual (e.g., hand pulling, digging) and mechanical (e.g., mowing) treatments for small populations and herbicide applications for larger populations; however, herbicide applications near water may be prohibited due to label restrictions. The objective of this research was to evaluate cattle trampling as a nonchemical method to reduce I. pseudacorus in riparian habitats. A greenhouse study was conducted to investigate the effects of inundation and two different timings of simulated trampling on I. pseudacorus density, height, and soluble sugar concentrations in the rhizomes. A complementary field demonstration was established on a ranch in northwestern Nebraska to evaluate cattle trampling effects on I. pseudacorus density and height after two consecutive years. Simulated cattle trampling in the greenhouse had no effect on I. pseudacorus density or height of non-inundated samples. However, combining trampling with inundation reduced I. pseudacorus density from a median of 10 I. pseudacorus per pot to 0 I. pseudacorus per pot and median height from 0.35 m to 0 m by the conclusion of the study. Additionally, the field demonstration resulted in reductions of both density and height of I. pseudacorus after two consecutive years (72% and 67% reduction, respectively). Soluble sugar concentrations were not impacted by any treatment.
Guarding the Shoreline: Oyster Farming, Salt Production, and Fishing Along the South China Coast (1667–1978)
Authors: Watson James L. 
Published: September 2021

Abstract
This article explores the shoreline industries (oysters, salt, fish, lime) that emerged along the Laufaushan coast in Hong Kong's New Territories, in the period 1667 to 1978. The shoreline in question was controlled by a local security force, staffed by young men from a nearby lineage. The study draws on ethnographic research carried out by the author and local documents (of village and government origin) gathered on site.
Late Sandbian (Sa2) radiolarians of the Pingliang Formation from the Guanzhuang section, Gansu Province, China
Authors: Perera Siyumini , Aitchison Jonathan C. 
Published: September 2021

AbstractA diverse, well-preserved radiolarian assemblage is reported from the Sandbian age Climacograptus bicornis Graptolite Biozone. This new assemblage, recovered from the Pingliang Formation in the Guanzhuang section, China, includes six new species along with 13 other previously described taxa. Geminusphaera new genus incorporates G. grandis n. sp. and G. kongtongensis n. sp. and is proposed for inaniguttids constructed from two distinct porous spheres bearing seven or more primary spines. Protopylentonema new genus is introduced to incorporate pylomate entactinarians with five-rayed initial spicules. It includes P. ordosensis n. sp. as well as P. aperta, P. rimata, and P. insueta that were formerly assigned to Kalimnasphaera. Micro-computed tomography investigation of skeletal microstructure supports establishment of the new genera together with other new spumellarian species: Haplotaeniatum implexa n. sp., Inanigutta quadrispinosa n. sp., and Kalimnasphaera pingliangensis n. sp. It also indicates that family-level reassignment of Etymalbaillella from the Proventocitidae to the Ceratoikiscidae is appropriate.Global distribution of Late Ordovician radiolarian occurrences highlights a strong preference for areas with equatorial to tropical sea surface temperatures. This must have led to ecological stress among radiolarian communities in adapting to global cooling in the Hirnantian.UUID: http://zoobank.org/3d3f55b8-0e70-4f9f-9738-265750d8ec3a.
Enforcing charitable trusts: a study on the English necessary interest rule
Authors: Jing Hui 
Published: September 2021

AbstractIn England, Parliament introduced the ‘necessary interest rule’ through the enactment of section 115 of the Charities Act 2011 (England and Wales), allowing ‘any person interested’ in a charitable trust to initiate charity proceedings against defaulting trustees in their administration of charitable assets. Nevertheless, insufficient attention has been paid to this rule despite it being initially enacted in 1853. Parliament has refrained from clearly defining the rule, and the courts have long been grappling with its meaning in determining whether a person is eligible to sue. This paper studies the necessary interest rule by exploring the way in which the courts have interpreted it and the uncertainties surrounding its operation. It is shown that, in the context of charitable trusts, the concern of securing the due administration and execution of the trust lies at the heart of the rule. The final section of this paper discusses the significant theoretical implications of the necessary interest rule. It considers the beneficiary-enforcer debate concerning the conceptual nature of express trusts and highlights the insights that analysis of the rule can provide into this debate.
Intraspecific facial bite marks in tyrannosaurids provide insight into sexual maturity and evolution of bird-like intersexual display
Authors: Brown Caleb M. , Currie Philip J. , Therrien François 
Published: September 2021

AbstractIntraspecific aggression, or agonism, is a widespread intrasexual selective behavior important to understanding animal behavioral ecology and reproductive systems. Such behavior can be studied either by direct observation or inferred from wound/scar frequency in extant species but is difficult to document in extinct taxa, limiting understanding of its evolution. Among extant archosaurs, crocodylians display extensive intrasexual aggression, whereas birds show extreme visual/vocal intersexual display. The evolutionary origin of this behavioral divergence, and pattern in non-avian dinosaurs, is unknown. Here we document the morphology, frequency, and ontogeny of intraspecific facial bite lesions (324 lesions) in a large sample of tyrannosaurids (202 specimens, 528 elements) to infer patterns of intraspecific aggression in non-avian theropods. Facial scars are consistent in position and orientation across tyrannosaurid species, suggesting bites were inflicted due to repeated/postured behavior. Facial scars are absent in young tyrannosaurids, first appear in immature animals (~50% adult skull length), are present in ~60% of the adult-sized specimens, and show aggressor:victim size isometry. The ontogenetic distribution of bite scars suggests agonistic behavior is associated with the onset of sexual maturity, and scar presence in approximately half the specimens may relate to a sexual pattern. Considered in a phylogenetic context, intraspecific bite marks are consistent and widely distributed in fossil and extant crocodyliforms and non-maniraptoriform theropods, suggesting a potential plesiomorphic behavior in archosaurs. Their absence in maniraptoriform theropods, including birds, may reflect a transition from boney cranial ornamentation and crocodylian-like intrasexual aggression to avian-like intersexual display with the evolution of pennaceous feathers.
Low-cooling-rate freezing in biomolecular cryo-electron microscopy for recovery of initial frames
Authors: Wu Chunling , Shi Huigang , Zhu Dongjie , Fan Kelong , Zhang Xinzheng 
Published: September 2021

AbstractWhen biological samples are first exposed to electrons in cryo-electron microcopy (cryo-EM), proteins exhibit a rapid ‘burst’ phase of beam-induced motion that cannot be corrected with software. This lowers the quality of the initial frames, which are the least damaged by the electrons. Hence, they are commonly excluded or down-weighted during data processing, reducing the undamaged signal and the resolution in the reconstruction. By decreasing the cooling rate during sample preparation, either with a cooling-rate gradient or by increasing the freezing temperature, we show that the quality of the initial frames for various protein and virus samples can be recovered. Incorporation of the initial frames in the reconstruction increases the resolution by an amount equivalent to using ~60% more data. Moreover, these frames preserve the high-quality cryo-EM densities of radiation-sensitive residues, which is often damaged or very weak in canonical three-dimensional reconstruction. The improved freezing conditions can be easily achieved using existing devices and enhance the overall quality of cryo-EM structures.
Evidence for distinct genetic and environmental influences on fear acquisition and extinction
Authors: Purves K. L. , Krebs G. , McGregor T. , Constantinou E. , Lester K. J. , Barry T. J. , Craske M. G. , Young K. S. , Breen G. , Eley T. C. 
Published: September 2021

AbstractBackgroundAnxiety disorders are highly prevalent with an early age of onset. Understanding the aetiology of disorder emergence and recovery is important for establishing preventative measures and optimising treatment. Experimental approaches can serve as a useful model for disorder and recovery relevant processes. One such model is fear conditioning. We conducted a remote fear conditioning paradigm in monozygotic and dizygotic twins to determine the degree and extent of overlap between genetic and environmental influences on fear acquisition and extinction.MethodsIn total, 1937 twins aged 22–25 years, including 538 complete pairs from the Twins Early Development Study took part in a fear conditioning experiment delivered remotely via the Fear Learning and Anxiety Response (FLARe) smartphone app. In the fear acquisition phase, participants were exposed to two neutral shape stimuli, one of which was repeatedly paired with a loud aversive noise, while the other was never paired with anything aversive. In the extinction phase, the shapes were repeatedly presented again, this time without the aversive noise. Outcomes were participant ratings of how much they expected the aversive noise to occur when they saw either shape, throughout each phase.ResultsTwin analyses indicated a significant contribution of genetic effects to the initial acquisition and consolidation of fear, and the extinction of fear (15, 30 and 15%, respectively) with the remainder of variance due to the non-shared environment. Multivariate analyses revealed that the development of fear and fear extinction show moderate genetic overlap (genetic correlations 0.4–0.5).ConclusionsFear acquisition and extinction are heritable, and share some, but not all of the same genetic influences.
Indirectstructural crosslinguistic influence in early Catalan–Spanish bilinguals in adulthood: Predicate selection in Catalan existential constructions
Authors: Perpiñán Silvia , Soto-Corominas Adriana 
Published: September 2021

AbstractThis study reports an oral production experiment investigating the expression of existentiality in the Catalan of adult Catalan–Spanish early bilinguals (N= 58) with comparable proficiencies but different language dominance. The results show qualitative differences among the bilinguals in existential predicate selection and in their supply of partitive pronouns, modulated by language dominance. Balanced Bilinguals as well as Spanish-dominant bilinguals significantly produced moreestar(in detriment ofser-hiandhaver-hi) not only in locative contexts, where Catalan already presents optionality regulated by semantic differences, but also in existential constructions, where this optionality does not exist. We argue forindirectcrosslinguistic influence (CLI), when the bilingualperceivescertain structural overlap within constructions, mediating the influence from one structure to another one and expanding the limits of CLI. The qualitative differences found among bilinguals challenge the idea of a bilingualism continuum in Catalan–Spanish bilingualism with an identical mental representation.
Design and simulation of a PK testbed for head impact evaluation
Authors: Rueda Arreguín José Luis , Ceccarelli Marco , Torres-SanMiguel Christopher René 
Published: September 2021

AbstractThis paper presents the design and simulation of a Parallel Kinematic (PK) testbed for head impacts. The proposed design is presented as a novel head impact testbed using a parallel platform as main motion simulation mechanism. The testbed is used to give a motion to a head mannequin to impact against a steel plate. In addition, the platform in the testbed allows to modify the orientation of the head mannequin model to evaluate different types of impacts. The testbed has been modeled with software MS ADAMS® to evaluate its performance with a dynamic simulation and to characterize the testbed design during top and lateral impact events. Results show that PK testbed gives a significant force and acceleration to the head mannequin at the moment of the impact.