bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Bellingshausen-Palmer meeting
Authors: Bulkeley Rip 
Published: June 2015

ABSTRACTThe celebrated meeting between Captain Bellingshausen of the Imperial Russian Navy and the American sealing skipper Nathaniel Brown Palmer, off the South Shetland Islands in February 1821, has often been described by following just one or other of the two men's divergent and in some respects irreconcilable accounts. The most contentious issue is whether or not Palmer told Bellingshausen about the existence of a body of land to the south of the South Shetlands, known today as the Antarctic Peninsula. This note attempts to reach a balanced assessment of the matter by examining evidence from both sides, including several previously unconsidered items. It concludes that, although the truth will never be known with absolute certainty, the basic American account is more plausible, by the narrowest of narrow margins, than the Russian.
Effort reduction and the large fish indicator: spatial trends reveal positive impacts of recent European fleet reduction schemes
Authors: ENGELHARD GEORG H. , LYNAM CHRISTOPHER P. , GARCÍA-CARRERAS BERNARDO , DOLDER PAUL J. , MACKINSON STEVEN 
Published: June 2015

SUMMARYThe large fish indicator (LFI), or ‘proportion of fish greater than 40 cm length in bottom trawl surveys,’ is a frequently debated indicator of Good Environmental Status in European regional seas. How does the LFI respond to changes in fishing pressure? This question is addressed here through analysis of fine-scale spatial trends in the LFI within the North Sea, compared between two periods of contrasting fisheries management: 1983–1999 and 2000–2012, respectively, before and after the onset of the European Union's fleet reduction scheme. Over the entire period, the LFI has decreased in large parts of the North Sea. However, most of the decline was from 1983–1999; since 2000 the LFI has improved in much of the North Sea, especially in UK waters. Comparison with international effort data shows that those western areas where the LFI has improved correspond with regions where otter trawl effort has decreased since 2000 (and previously was highest in the 1990s), and also with decreases in beam trawl effort. This study provides strong support that recent European effort reduction schemes are now beginning to result in an improved ecosystem state as indicated by the regional-scale improvement in the LFI.
Talking about sensitive topics during the advance care planning discussion: A peek into the black box
Authors: Andreassen Pernille , Neergaard Mette Asbjørn , Brogaard Trine , Skorstengaard Marianne Hjorth , Jensen Anders Bonde 
Published: June 2015

AbstractObjective:Advance care planning (ACP) discussions are emphasized as a valuable way of improving communication about end-of-life care. Yet we have very little knowledge of what goes on during actual ACP discussions. The aim of our study was to explore how the sensitive topics of end-of-life decisions are addressed in concrete ACP discussions, with special focus on doctor–patient interactions.Method:Following a discourse-analysis approach, the study uses the concept of doctor and patient “voices” to analyze 10 directly observed and audiotaped ACP discussions among patients, relatives, and a physician, carried out in connection with a pilot study conducted in Denmark.Results:Previous studies of directly observed patient–physician discussions about end-of-life care show largely ineffective communication, where end-of-life issues are toned down by healthcare professionals, who also tend to dominate the discussions. In contrast, the observed ACP discussions in our study were successful in terms of addressing such sensitive issues as resuscitation and life-prolonging treatment. Our analysis shows that patients and relatives were encouraged to take the stage, to reflect, and to make informed choices. Patients actively explored different topics and asked questions about their current situation, but some also challenged the concept of ACP, especially the thought of being able to take control of end-of-life issues in advance.Significance of Results:Our analysis indicates that during discussions about sensitive end-of-life issues the healthcare professional will be able to pose and explore sensitive ACP questions in a straightforward manner, if the voices that express empathy and seek to empower the patient in different ways are emphasized.
Childhood trauma and adulthood inflammation: a meta-analysis of peripheral C-reactive protein, interleukin-6 and tumour necrosis factor-α
Authors: Baumeister D , Akhtar R , Ciufolini S , Pariante C M , Mondelli V 
Published: June 2015

AbstractChildhood trauma confers higher risk of adulthood physical and mental illness; however, the biological mechanism mediating this association remains largely unknown. Recent research has suggested dysregulation of the immune system as a possible biological mediator. The present paper conducted a meta-analysis to establish whether early-life adversity contributes to potentially pathogenic pro-inflammatory phenotypes in adult individuals. A systematic search of Pubmed, PsycINFO, EMBASE, Scopus and Medline identified 25 articles for the meta-analysis, including 18 studies encompassing a sample of 16 870 individuals for C-reactive protein (CRP), 15 studies including 3751 individuals for interleukin-6 (IL-6) and 10 studies including 881 individuals for tumour necrosis factor-α (TNF-α). Random-effects meta-analysis showed that individuals exposed to childhood trauma had significantly elevated baseline peripheral levels of CRP (Fisher’s z=0.10, 95% confidence interval (CI)=0.05–0.14), IL-6 (z=0.08, 95% CI=0.03–0.14) and TNF-α (z=0.23, 95% CI=0.14–0.32). Subgroup analyses for specific types of trauma (sexual, physical or emotional abuse) revealed that these impact differentially the single inflammatory markers. Moreover, meta-regression revealed greater effect sizes in clinical samples for the association between childhood trauma and CRP but not for IL-6 or TNF-α. Age, body mass index (BMI) and gender had no moderating effects. The analysis demonstrates that childhood trauma contributes to a pro-inflammatory state in adulthood, with specific inflammatory profiles depending on the specific type of trauma.
Theory and computation of hot carriers generated by surface plasmon polaritons in noble metals
Authors: Bernardi Marco , Mustafa Jamal , Neaton Jeffrey B. , Louie Steven G. 
Published: June 2015

AbstractHot carriers (HC) generated by surface plasmon polaritons (SPPs) in noble metals are promising for application in optoelectronics, plasmonics and renewable energy. However, existing models fail to explain key quantitative details of SPP-to-HC conversion experiments. Here we develop a quantum mechanical framework and apply first-principles calculations to study the energy distribution and scattering processes of HCs generated by SPPs in Au and Ag. We find that the relative positions of thesanddbands of noble metals regulate the energy distribution and mean free path of the HCs, and that the electron–phonon interaction controls HC energy loss and transport. Our results prescribe optimal conditions for HC generation and extraction, and invalidate previously employed free-electron-like models. Our work combines density functional theory, GW and electron–phonon calculations to provide microscopic insight into HC generation and ultrafast dynamics in noble metals.
A Mesozoic bird from Gondwana preserving feathers
Authors: de Souza Carvalho Ismar , Novas Fernando E. , Agnolín Federico L. , Isasi Marcelo P. , Freitas Francisco I. , Andrade José A. 
Published: June 2015

AbstractThe fossil record of birds in the Mesozoic of Gondwana is mostly based on isolated and often poorly preserved specimens, none of which has preserved details on feather anatomy. We provide the description of a fossil bird represented by a skeleton with feathers from the Early Cretaceous of Gondwana (NE Brazil). The specimen sheds light on the homology and 3D structure of the rachis-dominated feathers, previously known from two-dimensional slabs. The rectrices exhibit a row of rounded spots, probably corresponding to some original colour pattern. The specimen supports the identification of the feather scapus as the rachis, which is notably robust and elliptical in cross-section. In spite of its juvenile nature, the tail plumage resembles the feathering of adult individuals of modern birds. Documentation of rachis-dominated tail in South American enantiornithines broadens the paleobiogeographic distribution of basal birds with this tail feather morphotype, up to now only reported from China.
The role of Hurst exponent on cold field electron emission from conducting materials: from electric field distribution to Fowler-Nordheim plots
Authors: de Assis T. A. 
Published: June 2015

AbstractThis work considers the effects of the Hurst exponent (H) on the local electric field distribution and the slope of the Fowler-Nordheim (FN) plot when considering the cold field electron emission properties of rough Large-Area Conducting Field Emitter Surfaces (LACFESs). A LACFES is represented by a self-affine Weierstrass-Mandelbrot function in a given spatial direction. For 0.1 ≤ H < 0.5, the local electric field distribution exhibits two clear exponential regimes. Moreover, a scaling between the macroscopic current density ("Equation missing") and the characteristic kernel current density ("Equation missing"), "Equation missing", with an H-dependent exponent "Equation missing", has been found. This feature, which is less pronounced (but not absent) in the range where more smooth surfaces have been found ("Equation missing"), is a consequence of the dependency between the area efficiency of emission of a LACFES and the macroscopic electric field, which is often neglected in the interpretation of cold field electron emission experiments. Considering the recent developments in orthodox field emission theory, we show that the exponent "Equation missing" must be considered when calculating the slope characterization parameter (SCP) and thus provides a relevant method of more precisely extracting the characteristic field enhancement factor from the slope of the FN plot.
TFH cells accumulate in mucosal tissues of humanized-DRAG mice and are highly permissive to HIV-1
Authors: Allam Atef , Majji Sai , Peachman Kristina , Jagodzinski Linda , Kim Jiae , Ratto-Kim Silvia , Wijayalath Wathsala , Merbah Melanie , Kim Jerome H. , Michael Nelson L. , Alving Carl R. , Casares Sofia , Rao Mangala 
Published: June 2015

AbstractCD4+ T follicular helper cells (TFH) in germinal centers are required for maturation of B-cells. While the role of TFH-cells has been studied in blood and lymph nodes of HIV-1 infected individuals, its role in the mucosal tissues has not been investigated. We show that the gut and female reproductive tract (FRT) of humanized DRAG mice have a high level of human lymphocytes and a high frequency of TFH (CXCR5+PD-1++) and precursor-TFH (CXCR5+PD-1+) cells. The majority of TFH-cells expressed CCR5 and CXCR3 and are the most permissive to HIV-1 infection. A single low-dose intravaginal HIV-1 challenge of humanized DRAG mice results in 100% infectivity with accumulation of TFH-cells mainly in the Peyer’s patches and FRT. The novel finding of TFH-cells in the FRT may contribute to the high susceptibility of DRAG mice to HIV-1 infection. This mouse model thus provides new opportunities to study TFH-cells and to evaluate HIV-1 vaccines.
Direct measurements of magnetic interaction-induced cross-correlations of two microparticles in Brownian motion
Authors: Romodina Maria N. , Khokhlova Maria D. , Lyubin Evgeny V. , Fedyanin Andrey A. 
Published: June 2015

AbstractThe effect of magnetic interactions on the Brownian motion of two magnetic microparticles is investigated. The cross-correlations of the thermal fluctuations of the two magnetic microbeads are directly measured using double-trap optical tweezers. It is experimentally demonstrated that the cross-correlation function is governed by the gradient of the magnetic force between the microparticles. The magnetic forces are measured with femtonewton precision and the magnetic dipole moments of individual microparticles are determined within an accuracy on the order of fA-m2.
Well-temperate phage: optimal bet-hedging against local environmental collapses
Authors: Maslov Sergei , Sneppen Kim 
Published: June 2015

AbstractUpon infection of their bacterial hosts temperate phages must chose between lysogenic and lytic developmental strategies. Here we apply the game-theoretic bet-hedging strategy introduced by Kelly to derive the optimal lysogenic fraction of the total population of phages as a function of frequency and intensity of environmental downturns affecting the lytic subpopulation. “Well-temperate” phage from our title is characterized by the best long-term population growth rate. We show that it is realized when the lysogenization frequency is approximately equal to the probability of lytic population collapse. We further predict the existence of sharp boundaries in system’s environmental, ecological and biophysical parameters separating the regions where this temperate strategy is optimal from those dominated by purely virulent or dormant (purely lysogenic) strategies. We show that the virulent strategy works best for phages with large diversity of hosts and access to multiple independent environments reachable by diffusion. Conversely, progressively more temperate or even dormant strategies are favored in the environments, that are subject to frequent and severe temporal downturns.
Spatial resolution versus data acquisition efficiency in mapping an inhomogeneous system with species diffusion
Authors: Chen Fengxiang , Zhang Yong , Gfroerer T. H. , Finger A. N. , Wanlass M. W. 
Published: June 2015

AbstractTraditionally, spatially-resolved photoluminescence (PL) has been performed using a point-by-point scan mode with both excitation and detection occurring at the same spatial location. But with the availability of high quality detector arrays like CCDs, an imaging mode has become popular for performing spatially-resolved PL. By illuminating the entire area of interest and collecting the data simultaneously from all spatial locations, the measurement efficiency can be greatly improved. However, this new approach has proceeded under the implicit assumption of comparable spatial resolution. We show here that when carrier diffusion is present, the spatial resolution can actually differ substantially between the two modes, with the less efficient scan mode being far superior. We apply both techniques in investigation of defects in a GaAs epilayer – where isolated singlet and doublet dislocations can be identified. A superposition principle is developed for solving the diffusion equation to extract the intrinsic carrier diffusion length, which can be applied to a system with arbitrarily distributed defects. The understanding derived from this work is significant for a broad range of problems in physics and beyond (for instance biology) – whenever the dynamics of generation, diffusion and annihilation of species can be probed with either measurement mode.
Black metal thin films by deposition on dielectric antireflective moth-eye nanostructures
Authors: Christiansen Alexander B. , Caringal Gideon P. , Clausen Jeppe S. , Grajower Meir , Taha Hesham , Levy Uriel , Asger Mortensen N. , Kristensen Anders 
Published: June 2015

AbstractAlthough metals are commonly shiny and highly reflective, we here show that thin metal films appear black when deposited on a dielectric with antireflective moth-eye nanostructures. The nanostructures were tapered and close-packed, with heights in the range 300-600 nm and a lateral, spatial frequency in the range 5–7 μm−1. A reflectance in the visible spectrum as low as 6% and an absorbance of 90% was observed for an Al film of 100 nm thickness. Corresponding experiments on a planar film yielded 80% reflectance and 20% absorbance. The observed absorbance enhancement is attributed to a gradient effect causing the metal film to be antireflective, analogous to the mechanism in dielectrics and semiconductors. We find that the investigated nanostructures have too large spatial frequency to facilitate efficient coupling to the otherwise non-radiating surface plasmons. Applications for decoration and displays are discussed.
Disease Containment Strategies based on Mobility and Information Dissemination
Authors: Lima A. , De Domenico M. , Pejovic V. , Musolesi M. 
Published: June 2015

AbstractHuman mobility and social structure are at the basis of disease spreading. Disease containment strategies are usually devised from coarse-grained assumptions about human mobility. Cellular networks data, however, provides finer-grained information, not only about how people move, but also about how they communicate. In this paper we analyze the behavior of a large number of individuals in Ivory Coast using cellular network data. We model mobility and communication between individuals by means of an interconnected multiplex structure where each node represents the population in a geographic area (i.e., a sous-préfecture, a third-level administrative region). We present a model that describes how diseases circulate around the country as people move between regions. We extend the model with a concurrent process of relevant information spreading. This process corresponds to people disseminating disease prevention information, e.g., hygiene practices, vaccination campaign notices and other, within their social network. Thus, this process interferes with the epidemic. We then evaluate how restricting the mobility or using preventive information spreading process affects the epidemic. We find that restricting mobility does not delay the occurrence of an endemic state and that an information campaign might be an effective countermeasure.
Investigation of mid-infrared emission characteristics and energy transfer dynamics in Er3+ doped oxyfluoride tellurite glass
Authors: Chen Fangze , Wei Tao , Jing Xufeng , Tian Ying , Zhang Junjie , Xu Shiqing 
Published: June 2015

AbstractEr3+ doped oxyfluoride tellurite glasses have been prepared. Three Judd-Ofelt parameters Ωt (t = 2, 4, 6) and radiative properties are calculated for prepared glasses. Emission characteristics are analyzed and it is found that prepared glasses possess larger calculated predicted spontaneous transition probability (39.97 s−1), emission cross section σem (10.18 × 10−21 cm2) and σem × Δλeff (945.32 × 10−28 cm3), corresponding to the 2.7 μm emission of Er3+: 4I11/2→ 4I13/2 transition. The results suggest that the prepared glasses might be appropriate optical material for mid-infrared laser application. Moreover, rate equation analysis which is rarely used in bulk glass has been carried out to explain the relationship between emission intensity and Er3+ concentration. The calculation results show that with the increment of Er3+ concentration, the energy transfer up-conversion rate of 4I13/2 state increases while the rate of 4I11/2 state reduces, resulting in the change of 2.7 μm emission.
Detecting the influence of rare stressors on rare species in Yosemite National Park using a novel stratified permutation test
Authors: Matchett J. R. , Stark Philip B. , Ostoja Steven M. , Knapp Roland A. , McKenny Heather C. , Brooks Matthew L. , Langford William T. , Joppa Lucas N. , Berlow Eric L. 
Published: June 2015

AbstractStatistical models often use observational data to predict phenomena; however, interpreting model terms to understand their influence can be problematic. This issue poses a challenge in species conservation where setting priorities requires estimating influences of potential stressors using observational data. We present a novel approach for inferring influence of a rare stressor on a rare species by blending predictive models with nonparametric permutation tests. We illustrate the approach with two case studies involving rare amphibians in Yosemite National Park, USA. The endangered frog, Rana sierrae, is known to be negatively impacted by non-native fish, while the threatened toad, Anaxyrus canorus, is potentially affected by packstock. Both stressors and amphibians are rare, occurring in ~10% of potential habitat patches. We first predict amphibian occupancy with a statistical model that includes all predictors but the stressor to stratify potential habitat by predicted suitability. A stratified permutation test then evaluates the association between stressor and amphibian, all else equal. Our approach confirms the known negative relationship between fish and R. sierrae, but finds no evidence of a negative relationship between current packstock use and A. canorus breeding. Our statistical approach has potential broad application for deriving understanding (not just prediction) from observational data.
Bounded rationality alters the dynamics of paediatric immunization acceptance
Authors: Oraby Tamer , Bauch Chris T. 
Published: June 2015

AbstractInteractions between disease dynamics and vaccinating behavior have been explored in many coupled behavior-disease models. Cognitive effects such as risk perception, framing and subjective probabilities of adverse events can be important determinants of the vaccinating behaviour and represent departures from the pure “rational” decision model that are often described as “bounded rationality”. However, the impact of such cognitive effects in the context of paediatric infectious disease vaccines has received relatively little attention. Here, we develop a disease-behavior model that accounts for bounded rationality through prospect theory. We analyze the model and compare its predictions to a reduced model that lacks bounded rationality. We find that, in general, introducing bounded rationality increases the dynamical richness of the model and makes it harder to eliminate a paediatric infectious disease. In contrast, in other cases, a low cost, highly efficacious vaccine can be refused, even when the rational decision model predicts acceptance. Injunctive social norms can prevent vaccine refusal, if vaccine acceptance is sufficiently high in the beginning of the vaccination campaign. Cognitive processes can have major impacts on the predictions of behaviour-disease models and further study of such processes in the context of vaccination is thus warranted.
Advanced aqueous rechargeable lithium battery using nanoparticulate LiTi2(PO4)3/C as a superior anode
Authors: Sun Dan , Jiang Yifan , Wang Haiyan , Yao Yan , Xu Guoqing , He Kejian , Liu Suqin , Tang Yougen , Liu Younian , Huang Xiaobing 
Published: June 2015

AbstractPoor cycling performance arising from the instability of anode is still a main challenge for aqueous rechargeable lithium batteries (ARLB). In the present work, a high performance LiTi2(PO4)3/C composite has been achieved by a novel and facile preparation method associated with an in-situ carbon coating approach. The LiTi2(PO4)3/C nanoparticles show high purity and the carbon layer is very uniform. When used as an anode material, the ARLB of LiTi2(PO4)3/C//LiMn2O4 delivered superior cycling stability with a capacity retention of 90% after 300 cycles at 30 mA g−1 and 84% at 150 mA g−1 over 1300 cycles. It also demonstrated excellent rate capability with reversible discharge capacities of 115 and 89 mAh g−1 (based on the mass of anode) at 15 and 1500 mA g−1, respectively. The superior electrochemical properties should be mainly ascribed to the high performance of LiTi2(PO4)3/C anode, benefiting from its nanostructure, high-quality carbon coating, appropriate crystal structure and excellent electrode surface stability as verified by Raman spectra, electrochemical impedance spectroscopy (EIS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements.