bluuebunny/crossref_metadata_2025 huggingface dataset:
Make the case for PLA for student‐veterans with strong partnerships, data
Authors: Sutton Halley
Published: January 2019

CLEVELAND — Offering credit for prior learning can be a successful tool for recruiting adult learners to your campus. That's often even more true for student‐veterans, whose military service has brought them copious life and learning expertise, which may not always be easy to translate into traditional academic credits. “Learning does not occur only in the classroom,” said TK Stoudt, adjunct instructor at the University of Louisville and graduate student at the University of Wyoming.
Accelerated degree programs work best with deep relationships, trust
Authors: Sutton Halley
Published: January 2019

Patricia Laprey, director of the accelerated degree program for adult learners at Ramapo College of New Jersey, worked as a secondary school teacher before finding her calling working with adult learners. “I really enjoy working with this age population so much more. They have so many resources and so many other supports and avenues — we have to really respect the very deliberate choice that an adult learner has made to go on this journey with us, with our institution,” Laprey said.
Total polyphenol quantitation using integrated NIR and MIR spectroscopy: A case study of Chinese dates (Ziziphus jujuba)
Authors: Arslan Muhammad , Xiaobo Zou , Tahir Haroon Elrasheid , Zareef Muhammad , Xuetao Hu , Rakha Allah
Published: January 2019

Introduction

Polyphenols are the foremost measure of phytochemicals in Chinese dates due to their many potential health benefits such as averting cancers, reducing the risk of coronary artery disease, diuretic activity, myocardial stimulant, coronary dilator and muscle relaxant.

Objective

To quantitate the polyphenols in Chinese dates using a data fusion approach with near‐infrared (NIR) and mid‐infrared (MIR) spectroscopy.

Material and Methods

A total of 80 Chinese dates samples were used for data acquisition from both NIR and MIR spectroscopy. The efficient spectral intervals were extracted by the synergy interval partial least square (Si‐PLS) algorithm as input variables for NIR‐MIR fusion model. A genetic algorithm (GA) was used to construct the model based on NIR‐MIR fusion. The performance of the developed models was evaluated using correlation coefficients of calibration (R2) and prediction (r2), root mean square error of prediction (RMSEP), bias and residual prediction deviation (RPD).

Results

The data fusion model based on the GA was superior compared to NIR and MIR build model. The optimal GA‐fusion model yielded R2 = 0.9621, r2 = 0.9451, RPD = 2.44, calibration set bias = 0.004 and prediction set bias = 0.061, computing only 15 variables.

Conclusion

These findings reveal that integration of NIR and MIR is possible for the prediction of total polyphenol content in Chinese dates.
Polyoxazoline associated with cardanol for bio‐based linear alkyl benzene surfactants
Authors: Delage Benoit , Briou Benoit , Brossier Thomas , Catrouillet Sylvain , Robin Jean‐Jacques , Lapinte Vincent
Published: January 2019

Well‐defined linear alkyl benzene surfactants (COxn) were successfully synthesized using cardanol as a green phenolic alternative and initiator for polyoxazoline (POx), the hydrophilic block of nonionic surfactants. Various hydrophilic lipophilic balance values were investigated by varying the POx length according to the [monomer]/[initiator] ratio. The chemical structure of the surfactants, in particular the terminal groups, was well identified by matrix assisted laser desorption ionization time of flight mass spectrometry demonstrating the good progress of the cationic ring‐opening polymerization. The COxn surfactants spontaneously self‐assembled in water at a critical aggregation concentration of 1–2 µmol L−1 into nano‐objects characterized by a hydrodynamic diameter of 11–24 nm and a number of aggregations ranging from 30 to 60 according to the worm‐like micelle model. © 2019 Society of Chemical Industry
Fine tuning the hydrophobicity of counter‐anions to tailor pore size in porous all‐poly(ionic liquid) membranes
Authors: Jiang Zhiping , Liu Yu‐ping , Shao Yue , Zhao Peng , Yuan Jiayin , Wang Hong
Published: January 2019

Charged porous polymer membranes (CPMs) emerging as a multifunctional platform for diverse applications in chemistry, materials science and biomedicine have been attracting widespread attention. Fabrication of CPMs in a controllable manner is of particular significance for optimizing their function and maximizing practical values. Herein, we report the fabrication of CPMs exclusively from poly(ionic liquid)s (PILs), and their pore size and wettability were precisely tailored by rational choice of counter‐anions. Specifically, a stepwise subtle increase in hydrophobicity of the counter‐anions by extending the length of fluorinated alkyl substituents, i.e. from bis(trifluoromethane sulfonyl)imide to bis(pentafluoroethane sulfonyl)imide and bis(heptafluoropropane sulfonyl)imide, decreased the average pore size gradually from 1546 to 157 and 77 nm, respectively. Meanwhile, the corresponding water contact angles increased from 90° to 102° and 120°. The sensitive control over the porous architectures and surface wettability of CPMs by systematic variation of anion hydrophobicity provides solid proof of the impact of PIL anions on CPM structure. © 2019 Society of Chemical Industry
Enhancement of orientation of rigid polymer blocks by incorporating rod–coil block copolymer chains into metal–organic frameworks
Authors: Wang Jin , Zhang Yunchao , Ye Feihong , Liu Xiaoli , Wang Xianlin , Zhou Xinhui , Lu Yunqing
Published: January 2019

Incorporation of polymer chains into metal–organic frameworks (MOFs) is a simple yet efficient method for improving the orientation of the polymer chains. However, due to their rigidity and high molecular weight, many rigid polymer chains are either not easily loaded into MOFs, or not easily aligned within the MOF channels. In this paper, we propose a strategy for enhancing the orientation of rigid blocks by incorporating rod–coil block copolymer chains into MOFs. In this strategy, on the one hand, the rigid blocks have a low molecular weight, so that the steric hindrance effect from the MOF channels could align the rigid blocks more efficiently. On the other hand, because the covalent bonds between the repeat units of the flexible blocks can rotate relatively easily, the steric hindrance effect from the flexible blocks can further help the rigid blocks to be oriented within the MOF channels. In confirmatory simulations, two all‐atom MOF models, [Zn2(BDC)2(TED)]n and [Zn2(BPDC)2(TED)]n (TED = triethylenediamine, BDC = 1,4‐benzenedicarboxylate, BPDC = 4,4′‐biphenyldicarboxylate), are established. With these MOF models, molecular dynamics simulations are performed for the rigid poly(phenylene vinylene) (PPV) chain and the rod–coil block copolymer PPV‐block‐polystyrene (PSt). Further, their respective degrees of orientation (DoOs) are calculated. Within [Zn2(BDC)2(TED)]n and [Zn2(BPDC)2(TED)]n, the DoOs of the rigid PPV blocks of PPV‐block‐PSt are 0.968 and 0.902, respectively, while the DoOs of the rigid PPV chains are 0.865 and 0.711, respectively. These calculation results prove the feasibility of our proposed strategy. © 2019 Society of Chemical Industry
Phenotypic and metabolic plasticity shapes life‐history strategies under combinations of abiotic stresses
Authors: Shaar‐Moshe Lidor , Hayouka Ruchama , Roessner Ute , Peleg Zvi
Published: January 2019

Plants developed various reversible and non‐reversible acclimation mechanisms to cope with the multifaceted nature of abiotic‐stress combinations. We hypothesized that in order to endure these stress combinations, plants elicit distinctive acclimation strategies through specific trade‐offs between reproduction and defense. To investigate Brachypodium distachyon acclimation strategies to combinations of salinity, drought and heat, we applied a system biology approach, integrating physiological, metabolic, and transcriptional analyses. We analyzed the trade‐offs among functional and performance traits, and their effects on plant fitness. A combination of drought and heat resulted in escape strategy, while under a combination of salinity and heat, plants exhibited an avoidance strategy. On the other hand, under combinations of salinity and drought, with or without heat stress, plant fitness (i.e., germination rate of subsequent generation) was severely impaired. These results indicate that under combined stresses, plants’ life‐history strategies were shaped by the limits of phenotypic and metabolic plasticity and the trade‐offs between traits, thereby giving raise to distinct acclimations. Our findings provide a mechanistic understanding of plant acclimations to combinations of abiotic stresses and shed light on the different life‐history strategies that can contribute to grass fitness and possibly to their dispersion under changing environments.
The impacts of cattle access points on deposited sediment levels in headwater streams in Ireland
Authors: O'Sullivan Matthew , Ó hUallacháin Daire , Antunes Patrícia Oliveira , Jennings Eleanor , Kelly‐Quinn Mary
Published: January 2019

Cattle access to streams has been linked globally with degradation of stream water quality, driven largely by bank erosion and resultant instream, fine sediment deposition. The majority of evidence on such effects is however based in arid and semiarid regions of the United States and Australia, with few studies relating to cool temperate climates such as Northwest Europe. In this study, “Quorer” resuspendable sediment samples were taken from riffle geomorphic units upstream (control) and at two points downstream (pressure and recovery) of cattle access points in headwater streams in agricultural catchments in Ireland to assess levels of deposited stream sediment. Samples were taken in April/May (2016) prior to the grazing season and in October (2016) at the end of the grazing season. Sites in good‐high ecological status catchments and less than good ecological status catchments were included in the study. Higher levels of sediment were found downstream of cattle access points in both good‐high status and less than good status catchments; however, the impacts of access points were spatially confined to, in most cases, the area immediately downstream of the point of access. There was a strong correlation between deposited sediment mass and organic matter (OM) mass, with levels of OM increasing linearly with deposited sediment mass. Levels of measured sediment were negatively correlated with riparian habitat health (measured using a qualitative habitat assessment). The results of this study highlight the need for measures to prevent cattle access to headwater streams where access points can be many in order to manage local habitat quality and downstream water quality issues.
Effect of side slope of main channels on formation and penetration of scour hole in confluences
Authors: Khosravinia Payam , Nikpour Mohammad Reza , Malekpour Amir , Hosseinzadeh Dalir Ali
Published: January 2019

In an open‐channel confluence, deep scour holes and depositional point bars are usually formed due to high bed‐shear stresses and secondary circulations. In the present study, presuming the effectiveness of channel geometry on the flow dynamics at the confluence, some variables including different side slope angles of the main channel (θ = 45°, 60°, 75°, 90°), lateral to downstream discharge ratio (Qr), and downstream densimetric Froude number (Frg3) were experimentally studied under clear‐water condition for the confluence angle α = 90°. According to the results, the increase of θ led to a greater penetration of scour hole across the main and tributary channels, whereas a little scour development was observed along those channels. Meanwhile, an increase in Qr and Frg3 caused further scouring, but their effects on the dimensions of scour hole diminished with increase of θ. Thus, with increase of Qr from 0.194 to 0.552, the mean penetration rate of scour hole to all directions for θ = 45°, 60°, 75°, and 90° was obtained 42.8%, 32.4%, 25%, and 20.5%, respectively. In addition, considering the effect of θ, Qr, and Frg3, some empirical relationships were obtained for estimating the penetration length of scour hole. The derived relationships show that Frg3 plays more important role on the dimensions of scour hole than θ.
Annual estimates of air pollutants from utilization of diesel as energy source at base transceiver stations
Authors: Okedere O. B. , Fakinle B. S. , Sonibare J. A.
Published: January 2019

The supply of electricity to more than 30,000 telecommunications industry base transceiver stations (BTSs) in Nigeria is currently provided via diesel‐fueled electric generators. Annual levels of uncontrolled air pollutants from the existing BTSs in the country were estimated by combining information on the potential to emit pollutants by diesel‐fueled generators with diesel utilization at the BTSs. The key information was the number of BTSs in the country from 2012 to 2014 and their diesel utilization. The estimated annual diesel utilization was 160,503,084.48, 196,514,656.80, and 209,761,966.80 U.S. gallons per annum in the years 2012, 2013, and 2014, respectively. The estimated annual emissions in the operating year 2014 were 4,457.45, 13,634.29, 63,347.12, and 4,163.77 tons per annum for particulate matter (PM), carbon monoxide (CO), nitrogen oxides (NOx), and sulfur dioxide (SO2), respectively. Considering the effects of these emissions on human health and environment, management measures and medium‐ to long‐term solutions are suggested to mitigate their impacts.
Application of mesoscale ensemble forecast method for prediction of wind speed ramps
Authors: Doan Van Quang , Kusaka Hiroyuki , Matsueda Mio , Ikeda Ryosaku
Published: January 2019

Sudden changes in wind speed, so‐called wind speed ramps, are a major concern for wind power system operators. The present study applies the mesoscale ensemble forecast method for the prediction of wind speed ramps at wind farms in Japan and evaluates the ability and utility of this method. The mesoscale ensemble forecast in this study (ENS21) consists of 21 members with a horizontal resolution of 10 km for a 5‐year period. The simulated results show that ENS21 produces better accuracy than the deterministic forecast with a horizontal resolution of 10 km (DET_L). On the other hand, the deterministic forecast with a horizontal resolution of 5 km (DET_H) also produces better accuracy than DET_L. From a practical perspective, however, the ENS21 is computationally expensive. Thus, the eight‐member mesoscale ensemble forecast (ENS8) with as same computational cost as a deterministic forecast with a horizontal resolution of 5 km (DET_H) is also evaluated. The simulated results show that ENS8 has almost same accuracy as ENS21 and DET_H in wind speed ramp forecasts. ENS8 has advantages over ENS21 and DET_H because ENS8 is computationally efficient and is able to benefit wind power operators with flexibility in the selection of probability thresholds for decision processes compared with a single. It can be concluded that the mesoscale ensemble forecast method is more useful for prediction of the wind speed ramp than the single deterministic forecast method with the same computational cost if the ensemble members are successfully selected.
Provenance determination of prehistorical pottery from Oshima Island belonging to Izu islands (Tokyo, Japan) using X‐ray fluorescence spectrometry
Authors: Ichikawa Shintaro , Matsumoto Takehaya , Nakamura Toshihiro , Kurisaki Tsutomu
Published: January 2019

A total of 41 pottery shards originating in the Jomon period (14000–300 BC) and Yayoi period (300 BC–250 AD) were excavated from the Shimotakabora site on Oshima Island of the Izu islands (Tokyo, Japan). X‐ray fluorescence spectrometry was used to determine the chemical composition (10 major oxides and 12 minor elements) of the potteries to identify the potteries' provenance, that is, local or nonlocal product. The calibration curves were drawn by synthetic standards prepared from a mixture of chemical reagents containing analytes, which presented good accuracy and reproducibility by analysis of the geochemical references. The pottery samples were classified by multivariate statistics such as principal component analysis and cluster analysis based on their chemical composition. Additionally, the X‐ray fluorescence results were compared with geochemical data from Oshima Island using scatter diagrams. The pottery provenance was identified by their classification. This provenance estimation indicates that 37 of the 41 potteries were brought to Oshima island from Japan's main island, Honshu, in the prehistoric age.
$$ \mathcal{N}=\left(0,\ 2\right) $$ SYK, chaos and higher-spins
Authors: Peng Cheng
Published: January 2019

Abstract

We study a 2-dimensional SYK-like model with

$$ \mathcal{N}=\left(0,\ 2\right) $$

N
=

0
,

2

supersymmetry. The model describes N chiral supermultiplets and M Fermi supermultiplets with a (q + 1)- field interaction. We solve the model analytically and numerically in the N ≫ 1, M ≫ 1 limit with

$$ \mu \equiv \frac{M}{N} $$

μ
≡

M
N

being a free parameter. Two distinct higher-spin symmetries emerge when the μ parameter approaches the two ends of its range. This is verified by the appearance of conserved higher-spin operators and the vanishing of chaotic behaviors in the two limits. Therefore this model provides a manifest realization of the widely believed connection between SYK-like models and higher-spin theories. In addition, as the parameter μ varies we find the largest Lyapunov exponent of this model to be slightly larger than that in models with non-chiral supersymmetry.
Enhanced Roles of Carbon Architectures in High-Performance Lithium-Ion Batteries
Authors: Wang Lu , Han Junwei , Kong Debin , Tao Ying , Yang Quan-Hong
Published: January 2019

Lithium-ion batteries (LIBs), which are high-energy-density and low-safety-risk secondary batteries, are underpinned to the rise in electrochemical energy storage devices that satisfy the urgent demands of the global energy storage market. With the aim of achieving high energy density and fast-charging performance, the exploitation of simple and low-cost approaches for the production of high capacity, high density, high mass loading, and kinetically ion-accessible electrodes that maximize charge storage and transport in LIBs, is a critical need. Toward the construction of high-performance electrodes, carbons are promisingly used in the enhanced roles of active materials, electrochemical reaction frameworks for high-capacity noncarbons, and lightweight current collectors. Here, we review recent advances in the carbon engineering of electrodes for excellent electrochemical performance and structural stability, which is enabled by assembled carbon architectures that guarantee sufficient charge delivery and volume fluctuation buffering inside the electrode during cycling. Some specific feasible assembly methods, synergism between structural design components of carbon assemblies, and electrochemical performance enhancement are highlighted. The precise design of carbon cages by the assembly of graphene units is potentially useful for the controlled preparation of high-capacity carbon-caged noncarbon anodes with volumetric capacities over 2100 mAh cm−3. Finally, insights are given on the prospects and challenges for designing carbon architectures for practical LIBs that simultaneously provide high energy densities (both gravimetric and volumetric) and high rate performance.
Improving Human Rights in the Private Security Industry: Envisioning the Role of ICoCA in Latin America
Authors: NARVÁEZ GONZÁLEZ Cristina , VALENCIA Katharine
Published: January 2019

The private security industry in Latin America has been associated with human rights abuses, particularly in the context of extractive operations. Most private security guards in the region are poorly trained and do not undergo adequate vetting. These factors combined with serious deficiencies in the rule of law across the region too often enable private security companies to effectively operate outside state control and engage in human rights abusive practices. This article argues that adoption of the International Code of Conduct for Private Security Providers (ICoC) by Latin American private security companies and states, coupled with civil society engagement with ICoC’s Association, may help reduce negative human rights impacts arising out of private security services within the extractive industry.
Le verbe aspectuel cesser et la contrainte stative : cesser obéit-il à la règle ou la transgresse-t-il? / The aspectual verb cesser and the stative constraint: Does cesser conform to the rule or deviate from it?
Authors: Léger Catherine
Published: January 2019

Cet article porte sur cesser qui, en contraste avec ses quasi-synonymes finir, achever et arrêter, semble échapper à la contrainte stative qui est généralement observée avec les verbes aspectuels. En fait, cesser permet assez facilement des infinitifs qui dénotent des états (Il a cessé d’être membre du syndicat), contrairement aux autres verbes aspectuels terminatifs (??Il a fini/achevé/arrêté d’être membre du syndicat). Je montre que les cas où ce prédicat ne semble pas respecter les contraintes générales imposées par les verbes aspectuels ne sont qu'apparemment des exceptions. L'article propose que la combinaison de certains états avec cesser crée un effet qui s'apparente à la sérialisation, une stratégie discutée dans certaines recherches, qui rend acceptable l'emploi de situations statives avec les verbes aspectuels. L'analyse s'inspire donc des prémisses des travaux de Bouchard (en particulier 1995, 2002), selon lesquelles l'explication des faits de langue doit demeurer simple et ne doit pas avoir recours à des mécanismes complexes qui sont autrement sans fondements.
Policy agendas in Italy: introduction to the special issue
Authors: Borghetto Enrico , Carammia Marcello , Russo Federico
Published: January 2019

Policy agendas studies analyse the dynamics of attention to policy issues over time and across actors and institutions to obtain insights into the functioning of political systems. The articles in this special issue draw on this approach to investigate key aspects of the Italian political system, with a special emphasis on the period spanning from the political crisis of the early 1990s to the watershed elections of 2013. They analyse a broad range of institutional and policy venues, including public opinion, political parties, the executive, the Parliament, and the Constitutional Court. While single articles address different research questions and focus on different institutions, they all share a focus on the dynamics of issue attention over time. This introduction provides a summary overview of the theoretical and methodological tools employed in the volume, highlighting how the study of policy agendas can contribute to the understanding of political systems and their change over time. It then summarises the main findings of single articles which, taken together, shed new light on several classic questions that have been widely debated in the literature on the evolution of the Italian political system.
Macroscopic model for unsteady flow in porous media
Authors: Lasseux Didier , Valdés-Parada Francisco J. , Bellet Fabien
Published: January 2019

The present article reports on a formal derivation of a macroscopic model for unsteady one-phase incompressible flow in rigid and periodic porous media using an upscaling technique. The derivation is carried out in the time domain in the general situation where inertia may have a significant impact. The resulting model is non-local in time and involves two effective coefficients in the macroscopic filtration law, namely a dynamic apparent permeability tensor,$\unicode[STIX]{x1D643}_{t}$, and a vector,$\unicode[STIX]{x1D736}$, accounting for the time-decaying influence of the flow initial condition. This model generalizes previous non-local macroscale models restricted to creeping flow conditions. Ancillary closure problems are provided, which allow the effective coefficients to be computed. Symmetry and positiveness analyses of$\unicode[STIX]{x1D643}_{t}$are carried out, showing that this tensor is symmetric only in the creeping regime. The effective coefficients are functions of time, geometry, macroscopic forcings and the initial flow condition. This is illustrated through numerical solutions of the closure problems. Predictions are made on a simple periodic structure for a wide range of Reynolds numbers smaller than the critical value characterizing the first Hopf bifurcation. Finally, the performance of the macroscopic model for a variety of macroscopic forcings and initial conditions is examined in several case studies. Validation through comparisons with direct numerical simulations is performed. It is shown that the purely heuristic classical model, widely used for unsteady flow, consisting of a Darcy-like model complemented with an accumulation term on the filtration velocity, is inappropriate.
A role for onomatopoeia in early language: evidence from phonological development
Authors: LAING CATHERINE
Published: January 2019

abstract

Onomatopoeia appear in high quantities in many infants’ earliest words, yet there is minimal research in this area. Instead, findings from the wider iconicity literature are generalised to include onomatopoeia, leading to the assumption that their iconic status makes them inherently learnable, thereby prompting their early production. In this review we bring together the literature on onomatopoeia specifically and iconicity more generally to consider infants’ acquisition from three perspectives: perception, production, and interaction. We consider these findings in relation to Imai and Kita’s (2014) ‘sound symbolism bootstrapping hypothesis’ to determine whether their framework can account for onomatopoeia alongside other iconic forms.
Introduction: Advances in Palaeogeography
Authors: MEINHOLD GUIDO
Published: January 2019

This special issue of Geological Magazine is dedicated to the memory of Dr Alan Gilbert Smith, Fellow of St John's College and Emeritus Reader in Geology at the University of Cambridge, who passed away on 13 August 2017 at the age of 80. I first met Alan at the 5th International Symposium on Eastern Mediterranean Geology in Thessaloniki, Greece, in spring 2004 and later on several occasions when I was working on the Cambridge Arctic Shelf Programme (CASP) in Cambridge. The palaeotectonic evolution of Greece was one of our common interests. Alan was one of the pathfinders in palaeogeographic research in the 20th century. Together with Sir Edward Bullard (1907–1980) and Jim E. Everett, he published the first computational approach in palaeogeography in their famous paper ‘The fit of the continents around the Atlantic’ (Bullard, Everett & Smith, 1965), which shows a very accurate geometrical fit of the circum-Atlantic continents using the early Cambridge University EDSAC 2 computer. Later, in a contribution in Nature entitled ‘The fit of the southern continents’, Smith & Hallam (1970) presented the first computer fit of the contour of the southern continents forming Gondwanaland. Worth mentioning also are his detailed palaeogeographical maps of the entire Earth, down to epoch level (e.g. Smith, Briden & Drewry 1973; Smith, Hurley & Briden 1981) and his work on the first three editions of A Geologic Time Scale (Harland et al.1982, 1990; Gradstein, Ogg & Smith 2005). Alan's great achievements in the Earth sciences have stimulated new ideas and had a huge impact on geological research, including palaeogeography.
The braid index of reduced alternating links
Authors: DIAO YUANAN , HETYEI GÁBOR , LIU PENGYU
Published: January 2019

It is well known that the minimum crossing number of an alternating link equals the number of crossings in any reduced alternating link diagram of the link. This remarkable result is an application of the Jones polynomial. In the case of the braid index of an alternating link, Yamada showed that the minimum number of Seifert circles over all regular projections of a link equals the braid index. Thus one may conjecture that the number of Seifert circles in a reduced alternating diagram of the link equals the braid index of the link, but this turns out to be false. In this paper we prove the next best thing that one could hope for: we characterise exactly those alternating links for which their braid indices equal the numbers of Seifert circles in their corresponding reduced alternating link diagrams. More specifically, we prove that if D is a reduced alternating link diagram of an alternating link L, then b(L), the braid index of L, equals the number of Seifert circles in D if and only if GS(D) contains no edges of weight one. Here GS(D), called the Seifert graph of D, is an edge weighted simple graph obtained from D by identifying each Seifert circle of D as a vertex of GS(D) such that two vertices in GS(D) are connected by an edge if and only if the two corresponding Seifert circles share crossings between them in D and that the weight of the edge is the number of crossings between the two Seifert circles. This result is partly based on the well-known MFW inequality, which states that the a-span of the HOMFLY polynomial of L is a lower bound of 2b(L)−2, as well as the result of Yamada relating the minimum number of Seifert circles over all link diagrams of L to b(L).
Linear bounds on characteristic polynomials of matroids
Authors: WANG SUIJIE , YEH YEONG–NAN , ZHOU FENGWEI
Published: January 2019

Let χ(t) = a0tn – a1tn−1 + ⋯ + (−1)rartn−r be the chromatic polynomial of a graph, the characteristic polynomial of a matroid, or the characteristic polynomial of an arrangement of hyperplanes. For any integer k = 0, 1, …, r and real number x ⩾ k − r − 1, we obtain a linear bound of the coefficient sequence, that is
\begin{align*} {r+x\choose k}\leqslant \sum_{i=0}^{k}a_{i}{x\choose k-i}\leqslant {m+x\choose k}, \end{align*}
where m is the size of the graph, matroid, or hyperplane arrangement. It extends Whitney’s sign-alternating theorem, Meredith’s upper bound theorem, and Dowling and Wilson’s lower bound theorem on the coefficient sequence. In the end, we also propose a problem on the combinatorial interpretation of the above inequality.
Distinguishing differential susceptibility, diathesis-stress, and vantage sensitivity: Beyond the single gene and environment model
Authors: Jolicoeur-Martineau Alexia , Belsky Jay , Szekely Eszter , Widaman Keith F. , Pluess Michael , Greenwood Celia , Wazana Ashley
Published: January 2019

Currently, two main approaches exist to distinguish differential susceptibility from diathesis-stress and vantage sensitivity in Genotype × Environment interaction (G × E) research: regions of significance (RoS) and competitive-confirmatory approaches. Each is limited by its single-gene/single-environment foci given that most phenotypes are the product of multiple interacting genetic and environmental factors. We thus addressed these two concerns in a recently developed R package (LEGIT) for constructing G × E interaction models with latent genetic and environmental scores using alternating optimization. Herein we test, by means of computer simulation, diverse G × E models in the context of both single and multiple genes and environments. Results indicate that the RoS and competitive-confirmatory approaches were highly accurate when the sample size was large, whereas the latter performed better in small samples and for small effect sizes. The competitive-confirmatory approach generally had good accuracy (a) when effect size was moderate and N ≥ 500 and (b) when effect size was large and N ≥ 250, whereas RoS performed poorly. Computational tools to determine the type of G × E of multiple genes and environments are provided as extensions in our LEGIT R package.
Testing the interest-parity condition with Irving Fisher's example of Indian rupee and sterling bonds in the London financial market, 1869–1906
Authors: Herger Nils
Published: January 2019

Following the pioneering work of Irving Fisher, this article assesses the uncovered interest-parity (UIP) condition by comparing Indian interest and exchange rates during the 1869 to 1906 period. The Indian case provides a good example of the UIP condition, since Indian rupee and sterling bonds were simultaneously traded in the London financial market and subject to negligible default risks. Large deviations from the UIP condition arose when India suffered from pervasive levels of uncertainty about the future of its silver-based currency system. Otherwise, a relatively close correlation arises between sterling-to-rupee interest-rate differences and exchange-rate changes.
The Austrian banking crisis of 1931: a reassessment
Authors: Macher Flora
Published: January 2019

The current literature on the causes of the Austrian financial crisis in 1931 emphasises both foreign and domestic factors. This article offers new data to analyse this issue. Its findings reinforce the importance of a domestic factor in bringing about the crisis: universal banks’ exposure to industrial enterprises, which were the universal banks’ main borrowers and creditors. During the 1920s, these industrial enterprises failed to perform well, rendering the universal banks insolvent. The Credit-Anstalt, which became an ‘acquirer of last resort’ for three other universal banks during the 1920s, was insolvent as early as 1925. The bank, however, could have avoided bankruptcy had it been spared the burden of Unionbank's non-performing assets.
Michelle Obama as a Political Symbol: Race, Gender, and Public Opinion toward the First Lady
Authors: Badas Alex , Stauffer Katelyn E.
Published: January 2019

Popular commentary surrounding Michelle Obama focuses on the symbolic importance of her tenure as the nation's first African American first lady. Despite these assertions, relatively few studies have examined public opinion toward Michelle Obama and the extent to which race and gender influenced public evaluations of her. Even fewer studies have examined how the intersection of race and gender influenced political attitudes toward Michelle Obama and her ability to serve as a meaningful political symbol. Using public opinion polls from 2008 to 2017 and data from the Black Women in America survey, we examine public opinion toward Michelle Obama as a function of respondents’ race, gender, and the intersection between the two. We find that African Americans were generally more favorable toward Michelle Obama than white Americans, with minimal differences between men and women. Although white women were no more likely than white men to view Michelle Obama favorably, we find that they were more likely to have information on Michelle Obama's “Let's Move” initiative. Most importantly, we find that Michelle Obama served as a unique political symbol for African American women and that her presence in politics significantly increased black women's evaluation of their race-gender group.
Miniaturized open-ended dual-band band-pass filter with series stepped capacitance and shunt meandered line inductance for microwave frequency applications
Authors: Mishra Naveen , Choudhary Dilip Kumar , Chaudhary Raghvendra Kumar
Published: January 2019

In this paper, a miniaturized open-ended dual-band band-pass filter with stepped series capacitance and shunt meandered line inductance for microwave frequency applications has been designed and discussed. In order to offer ease of fabrication and uniplanar configuration, coplanar waveguide feeding arrangement has been used. Zeroth order resonance, a special phenomenon of composite right/left handed transmission line has been utilized to miniaturize the filter size. The designed filter structure offers miniaturization with overall footprint size of 0.26λg × 0.19λg, where λg is the guided wavelength at the center frequency of 1.46 GHz. It offers 58.90% (1.03–1.89 GHz) and 25.93% (2.55–3.31 GHz) measured −3 dB fractional bandwidth with respect to the center frequencies of 1.46 and 2.93 GHz, respectively. Dispersion plot has been utilized to discuss the metamaterial properties for the proposed dual-band band-pass filter. In addition to above, the proposed filter structure presents almost flat group delay curve within both passbands. The proposed filter structure can be suitably utilized for distinct wireless applications, for example global navigation satellite system (1.559–1.610 GHz), GSM1800 (1.7–1.8 GHz), Wi-MAX (2.5–2.7 GHz), and naval radar and air traffic control (2.7–2.9 GHz).
Design and implementation of 2.5D frequency-selective surface based on substrate-integrated waveguide technology
Authors: Varikuntla Krushna Kanth , Singaravelu Raghavan
Published: January 2019

In this paper, the patch-type frequency selective surfaces (FSS) based on substrate-integrated waveguide (SIW) technology is proposed to improve the bandwidth (BW) and angular performance. The proposed FSS configuration overcomes the limitations of both conventional 2D and 3D FSS structures. A closely coupled cascaded mechanism is employed to combine two identical FSS elements separated by thin dielectric substrate results in incorporation of SIW technology; hence, named as 2.5D FSS. A derived equivalent circuit model is used to estimate the basic performance of proposed FSS–SIW elements, and the response of analytical expressions has been validated and final design is obtained using full-wave simulations. Two basic FSS elements viz. single square loop and a Jerusalem cross have been investigated to prove the enhancement in their BW and angular stability. The proposed technique evidently improves the BW and angular stability of FSS structures than in its established form. Besides, various important parameters that influence the performance characteristics of reported 2.5D FSSs are also studied. The important observations made on the thickness, as the thickness increases the bandstop FSS, can change to bandpass FSS. Finally, the proposed FSS structure has been fabricated and measured using free space measurement setup, to show the effectiveness of theoretical results. The measured results show good agreement with simulated results at normal and oblique incidence angle.
Validation of a German Version of the Dimensions of the Learning Organization Questionnaire (DLOQ) in German Craft Companies
Authors: Kortsch Timo , Kauffeld Simone
Published: January 2019

Abstract. An explicit learning culture can help to systematize learning in small companies with a high degree of informal human resource development. The Dimensions of the Learning Organization Questionnaire (DLOQ; Marsick & Watkins, 2003 ) has already been used to assess learning culture in many international studies mainly with large organizations. However, the multidimensional structure of the DLOQ was criticized in the past. Therefore, this study (N = 856) investigated the dimensionality of a German translation of the DLOQ in the German crafts sector and the effect of the DLOQ dimensions on two criterions (i. e., commitment, job satisfaction). The results confirm the expected seven-factor structure of the German DLOQ (21 items) with good psychometric characteristics that were stable in different subsamples (i. e., different work levels and sectors). The correlations with the criterions confirm the external validity of the DLOQ. Furthermore, leaders rated all seven DLOQ dimensions higher than nonleaders did.
The Influence of Competing Hydroclimate Processes on Stable Isotope Ratios in Tropical Rainfall
Authors: Konecky B. L. , Noone D. C. , Cobb K. M.
Published: January 2019

In tropical paleoclimate studies, paleo‐precipitation is often reconstructed from proxies via the “amount effect,” that is, the empirical inverse relationship between local precipitation amount (P) and the oxygen isotopic composition of precipitation (δ18OP). However, recent research has illustrated numerous microphysical and dynamical controls on δ18OP that do not necessarily covary with P, complicating the reconstruction of circulation features like the Intertropical Convergence Zone. Here we introduce a new conceptual and statistical model for δ18OP that better captures the physical foundations for δ18OP as a tracer of hydrological balance. We find that bulk precipitation microphysics and cloud type exert comparable influences on δ18OP. Moisture transport plays an important secondary role in regions of deep atmospheric convection such as the Intertropical Convergence Zone and Indo‐Pacific Warm Pool. Our findings help reconcile conflicting interpretations of Intertropical Convergence Zone excursions, and provide a firm physical grounding for more nuanced, accurate interpretations of past hydroclimate using water isotope proxies.
Methane Emissions from the Marcellus Shale in Southwestern Pennsylvania and Northern West Virginia Based on Airborne Measurements
Authors: Ren Xinrong , Hall Dolly L. , Vinciguerra Timothy , Benish Sarah E. , Stratton Philip R. , Ahn Doyeon , Hansford Jonathan R. , Cohen Mark D. , Sahu Sayantan , He Hao , Grimes Courtney , Fuentes Jose D. , Shepson Paul B. , Salawitch Ross J. , Ehrman Sheryl H. , Dickerson Russell R.
Published: January 2019

Natural gas production in the United States has increased rapidly over the past decade, along with concerns about methane (CH4) fugitive emissions and its climate impacts. Quantification of CH4 emissions from oil and natural gas (O&NG) operations is important for establishing scientifically sound policies for mitigating greenhouse gases. We use the aircraft mass balance approach for three flight experiments in August and September 2015 to estimate CH4 emissions from O&NG operations over the southwestern Marcellus Shale. We estimate a mean CH4 emission rate as 21.2 kg/s with 28% coming from O&NG operations. The mean CH4 emission rate from O&NG operations was estimated to be 1.1% of total NG production. The individual best‐estimate emission rates from the three flight experiments ranged from 0.78 to 1.5%, with overall limits of 0% and 3.5%. These emission rates are at the low end of other top‐down studies, but consistent with the few observational studies in the Marcellus Shale region as well as the U.S. Environmental Protection Agency CH4 inventory. A substantial source of CH4 (~70% of observed CH4 emissions) was found to contain little ethane, possibly due to coalbed CH4 emitted either directly from coal mines or from wells drilled through coalbed layers in O&NG operations. Recent regulations requiring capture of gas from the completion‐venting step of hydraulic fracturing appear to have reduced the atmospheric release of CH4. Our study suggests that for a 20‐year time scale, energy derived from the combustion of natural gas extracted from this region likely exerts a net climate benefit compared to coal.
Quantifying the Sensitivity of Progressive Landslide Movements to Failure Geometry, Undercutting Processes and Hydrological Changes
Authors: Leshchinsky Ben , Olsen Michael J. , Mohney Curran , O'Banion Matt , Bunn Michael , Allan Jonathan , McClung Reilly
Published: January 2019

Many landslides cause destruction through progressive, gradual movements that stem from precipitation and toe erosion caused by marine or riverine processes. The magnitude and timing of seasonal landslide movement may be influenced by changing slide mass geometry and pore pressure response. The rate of landslide advance and potential for sustained movement has previously been studied in the context of hydrological factors, such as dilative or contractive pore pressure response, but the sensitivity of realistic landslide geometry subject to toe erosion is not well quantified. The purpose of this study is to assess the sensitivity of landslide movements to seasonal pore pressure increases and erosive processes. This assessment is performed through the development of a limit equilibrium framework couples time‐dependent feedback between coulomb friction, pore pressure, and evolving landslide geometry. This enables quantification of the relative influence of time‐dependent changes in pore pressure and rates of toe undercutting on landslide advance. The proposed model shows good agreement with monitoring data from three landslides in coastal Oregon, USA. Sensitivity to erosion, pore pressure, and geometry are assessed. Although fluctuations in pore pressures are found to be the primary driver for landslide movements at the sites, there is significant, nonlinear sensitivity to plausible erosion rates. This sensitivity is particularly apparent for landslides that tend to be short in length as the removal of buttressing materials is proportionally more destabilizing. These findings are an important consideration, particularly as increasingly extreme storm events that will likely magnify landslide movements in coastal or fluvial environments.
Present and Past‐Millennial Eutrophication in the Gulf of Gdańsk (Southern Baltic Sea)
Authors: Szymczak‐Żyła M. , Krajewska M. , Witak M. , Ciesielski T. M. , Ardelan M. V. , Jenssen B. M. , Goslar T. , Winogradow A. , Filipkowska A. , Lubecki L. , Zamojska A. , Kowalewska G.
Published: January 2019

Eutrophication is manifested by increased primary production leading to oxygen depletion in near‐bottom water and toxic cyanobacteria blooms. This is an important contemporary problem of the Baltic Sea and many other coastal waters. The present eutrophication is mainly ascribed to anthropogenic activity. To compare the present trophic state with that during past millennia, two sediment cores (50 cm long and ~400 cm long covering ca. 5,500 years) were taken from the Gulf of Gdańsk (southern Baltic Sea). The core subsamples were analyzed for phytoplankton pigments (chlorophylls and their derivatives, and carotenoids). In addition, carbon (Ctot, Corg, and δ13C), 14C dating, grain size, diatoms, and selected metals in the cores were analyzed to determine conditions in the depositional environment. The results indicated that there were high primary production periods in the past, during the Littorina Sea and the Roman Climatic Optimum, accompanied by oxygen deficiency in the near‐bottom water, most probably caused by climate warming. The ratio of 132,173‐cyclopheophorbide‐a enol, a labile degradation product of chlorophyll‐a, to the sum of other chloropigments‐a (CPPB‐aE/ΣChlns‐a) is proposed as a new paleoredox proxy. Heterocystous cyanobacteria blooms of an intensity similar to or even greater than at present also occurred in past millennia and were connected with climate warming. Hence, eutrophication must have occurred in the past, which means that natural factors have a substantial influence on it.
Fall 2018 AGU Editors' Highlights: Living Within the Sun's Stormy Atmosphere
Authors: Knipp Delores J.
Published: January 2019

This article presents highlights in space weather science presented at the American Geophysical Union Literature Review Session at the 2018 Fall AGU.
Acidosis enhances the self-renewal and mitochondrial respiration of stem cell-like glioma cells through CYP24A1-mediated reduction of vitamin D
Authors: Hu Peishan , Li Shanshan , Tian Ningyu , Wu Fan , Hu Yan , Li Dengke , Qi Yingjiao , Wei Zhizhong , Wei Qunfang , Li Yanchao , Yin Bin , Jiang Tao , Yuan Jiangang , Qiang Boqin , Han Wei , Peng Xiaozhong
Published: January 2019

Acidosis is a significant feature of the tumor microenvironment in glioma, and it is closely related to multiple biological functions of cancer stem cells. Here, we found that the self-renewal ability, the mitochondrial activity and ATP production were elevated in stem cell-like glioma cells (SLCs) under acidic microenvironment, which promoted and maintained the stemness of SLCs. Under acidosis, 25-hydroxy vitamin D3-24-hydroxylase (CYP24A1) was upregulated and catalyzed the fast degradation of 1α,25(OH)2D3. We further revealed that the active form of vitamin D (1α,25(OH)2D3) could inhibit the expression of stemness markers, attenuate acidosis-induced increase of self-renewal ability and mitochondrial respiration in stem cell-like glioma cells. Our study indicates that the acidosis–CYP24A1–vitamin D pathway may be a key regulator of the cancer stem cell phenotype in malignant glioma and point out the potential value for the utilization of vitamin D to target cancer stem cells and to restrain the growth of malignant glioma in the future.