bluuebunny/crossref_metadata_2025_split huggingface dataset:
Golden codeword–based modulation schemes for single‐input multiple‐output systems
Authors: Xu Hongjun , Pillay Narushan 
Published: April 2019

SummaryThe Golden code has full rate and full diversity. The Golden codeword matrix contains two pairs of super symbols. Based on one pair of super symbols, two modulation schemes, Golden codeword–based M‐ary quadrature amplitude modulation (GC‐MQAM) and component‐interleaved GC‐MQAM (CI‐GC‐MQAM), are proposed for single‐input multiple‐output (SIMO) systems. Since the complexities of the maximum likelihood detection for the proposed GC‐MQAM and CI‐GC‐MQAM are proportional to O(M2) and O(M4), respectively, low complexity detection schemes for the proposed GC‐MQAM and CI‐GC‐MQAM are further proposed. In addition, the theoretical average bit error probabilities (ABEPs) for the proposed GC‐MQAM and CI‐GC‐MQAM are derived. The derived ABEPs are validated through Monte Carlo simulations. Simulation and theoretical results show that the proposed GC‐MQAM can achieve the error performance of signal space diversity. Simulation and theoretical results further show that the proposed CI‐GC‐16QAM, ‐64QAM, and ‐256QAM with three receive antennas can achieve approximately 2.2, 2.0, and 2.1 dB gain at a bit error rate of 4 × 10−6 compared with GC‐16QAM, ‐64QAM, and ‐256QAM, respectively.
Differential associations of ferritin and 25‐hydroxyvitamin D with fasting glucose and diabetes risk in community dwelling older men
Authors: Carrivick Simon , Alfonso Helman , Golledge Jonathan , Clancy Paula , Flicker Leon , Gunton Jenny E. , Hankey Graeme J. , Almeida Osvaldo P. , Norman Paul E. , Yeap Bu B. 
Published: April 2019

AbstractAimsWe examined associations of ferritin and 25‐hydroxyvitamin D with fasting glucose and prevalent diabetes in older men.MethodsCross‐sectional analysis of 4153 community‐dwelling men aged 70 to 89 years in Western Australia. Plasma ferritin, 25‐hydroxyvitamin D, and glucose were assayed. Diabetes was ascertained from self‐report, medications, and fasting glucose.ResultsThere were 577 men with diabetes (13.9%). In the whole cohort, ferritin was associated with fasting glucose (0.051 mmol/L per 1 SD increase in ferritin, P = .006) and 25‐hydroxyvitamin D was inversely associated (−0.085 mmol/L per 1 SD, P < .001). Ferritin was not associated with prevalent diabetes (highest vs. lowest quartile; >225 vs <66 μg/L: adjusted odds ratio [OR] 0.97, 95% confidence interval [CI], 0.74‐1.27, P = .83). Higher vitamin D was associated with decreased odds of prevalent diabetes (highest vs lowest quartile; >82 nmol/L vs <53 nmol/L: OR = 0.57, 95% CI = 0.43‐0.75, P < .001). There was no interaction between ferritin and vitamin D on diabetes risk.ConclusionsIn older men, ferritin is associated with fasting glucose but not prevalent diabetes. Higher 25‐hydroxyvitamin D concentrations are independently associated with lower fasting glucose and reduced risk of diabetes. Clinical trials are required to determine whether interventions, which raise vitamin D concentrations, would reduce incidence of diabetes in this expanding demographic group.
Simultaneous quantification of ten key Kratom alkaloids in Mitragyna speciosa leaf extracts and commercial products by ultra‐performance liquid chromatography−tandem mass spectrometry
Authors: Sharma Abhisheak , Kamble Shyam H. , León Francisco , Chear Nelson J.‐Y. , King Tamara I. , Berthold Erin C. , Ramanathan Surash , McCurdy Christopher R. , Avery Bonnie A. 
Published: April 2019

AbstractKratom (Mitragyna speciosa) is a psychoactive plant popular in the United States for the self‐treatment of pain and opioid addiction. For standardization and quality control of raw and commercial kratom products, an ultra‐performance liquid chromatography−tandem mass spectrometry (UPLC−MS/MS) method was developed and validated for the quantification of ten key alkaloids, namely: corynantheidine, corynoxine, corynoxine B, 7‐hydroxymitragynine, isocorynantheidine, mitragynine, mitraphylline, paynantheine, speciociliatine, and speciogynine. Chromatographic separation of diastereomers, or alkaloids sharing same ion transitions, was achieved on an Acquity BEH C18 column with a gradient elution using a mobile phase containing acetonitrile and aqueous ammonium acetate buffer (10mM, pH 3.5). The developed method was linear over a concentration range of 1–200 ng/mL for each alkaloid. The total analysis time per sample was 22.5 minutes. The analytical method was validated for accuracy, precision, robustness, and stability. After successful validation, the method was applied for the quantification of kratom alkaloids in alkaloid‐rich fractions, ethanolic extracts, lyophilized teas, and commercial products. Mitragynine (0.7%–38.7% w/w), paynantheine (0.3%–12.8% w/w), speciociliatine (0.4%–12.3% w/w), and speciogynine (0.1%–5.3% w/w) were the major alkaloids in the analyzed kratom products/extracts. Minor kratom alkaloids (corynantheidine, corynoxine, corynoxine B, 7‐hydroxymitragynine, isocorynantheidine) were also quantified (0.01%–2.8% w/w) in the analyzed products; however mitraphylline was below the lower limit of quantification in all analyses.
Nocturnal Hypoxia Activation of the Hedgehog Signaling Pathway Affects Pediatric Nonalcoholic Fatty Liver Disease Severity
Authors: Sundaram Shikha S. , Swiderska‐Syn Marzena , Sokol Ronald J. , Halbower Ann C. , Capocelli Kelley E. , Pan Zhaoxing , Robbins Kristen , Graham Brian , Diehl Anna Mae 
Published: April 2019

Chronic intermittent hypoxia and hedgehog (Hh) pathway dysregulation are associated with nonalcoholic fatty liver disease (NAFLD) progression. In this study, we determined the relationship between obstructive sleep apnea (OSA)/nocturnal hypoxia and Hh signaling in pediatric NAFLD. Adolescents with histologic NAFLD (n = 31) underwent polysomnogram testing, laboratory testing, and Sonic Hh (SHh), Indian hedgehog (IHh), glioblastoma‐associated oncogene 2 (Gli2), keratin 7 (K7), α‐smooth muscle actin (α‐SMA), and hypoxia‐inducible factor 1α (HIF‐1α) immunohistochemistry. Aspartate aminotransferase (AST) correlated with SHh, r = 0.64; Gli2, r = 0.4; α‐SMA, r = 0.55; and K7, r = 0.45 (P < 0.01), as did alanine aminotransferase (ALT) (SHh, r = 0.51; Gli2, r = 0.43; α‐SMA, r = 0.51; P < 0.02). SHh correlated with NAFLD activity score (r = 0.39), whereas IHh correlated with inflammation (r = −0.478) and histologic grade (r = −0.43); P < 0.03. Subjects with OSA/hypoxia had higher SHh (4.0 ± 2.9 versus 2.0 ± 1.5), Gli2 (74.2 ± 28.0 versus 55.8 ± 11.8), and α‐SMA (6.2 ± 3.3 versus 4.3 ± 1.2); compared to those without (P < 0.03). OSA severity correlated with SHh (r = 0.31; P = 0.09) and Gli2 (r = 0.37; P = 0.04) as did hypoxia severity, which was associated with increasing SHh (r = −0.53), Gli2 (r = −0.52), α‐SMA (r = −0.61), and K7 (r = −0.42); P < 0.02. Prolonged O2 desaturations <90% also correlated with SHh (r = 0.55) and Gli2 (r = 0.61); P < 0.05. Conclusion: The Hh pathway is activated in pediatric patients with NAFLD with nocturnal hypoxia and relates to disease severity. Tissue hypoxia may allow for functional activation of HIF‐1α, with induction of genes important in epithelial‐mesenchymal transition, including SHh, and NAFLD progression.
Impact of fertilization on cover crops and microbial community on a bauxite‐mined soil undergoing reclamation
Authors: Teixeira Rafael S. , Souza Ivan F. , Santos Rafael S. , Gomes Lucas C. , Borges Silvano R. , Vergütz Leonardus , Silva Ivo R. 
Published: April 2019

AbstractThe reclamation of bauxite‐mined areas can be favored by the application of organic and/or chemical fertilization to restore the vegetation. Otherwise, the impact of fertilizations on soil microbiota or plant–microbe interactions as land reclamation progresses is less understood. To address this issue, we evaluated the impact of organic and chemical fertilization on plants and soil microbial community within the first 36 months of land reclamation in a bauxite‐mined site. The experiment was set up according to a split‐plot design in which the main plots received fertilizations [non‐fertilized control (NF), chemical fertilization (CF; NPK and rock phosphate), organic fertilization (OF; poultry litter), and CF+OF combined], and the subplots received cover crops [no cover crops (NC), grass (B; Brachiaria), legume (S, Stylosanthes), and B+S combined]. Cover crops biomass yield was assessed annually with five field campaigns per year. We used phospholipid fatty acids (PLFAs) to infer the impacts of mining and restoration practices on actinobacteria, Gram‐negative and Gram‐positive bacteria, arbuscular mycorrhizal fungi, and fungi. Accordingly, PLFAs were determined before bauxite mining (pre‐mining), six months after topsoil reconfiguration (post‐mining), and after 14 and 36 months following the application of the fertilizations and cover crops. PLFAs results indicated that in post‐mining, the living microbiota was significantly lower than in pre‐mining. Cover crops biomass yield was highest for B and B+S fertilized with CF+OF at 14 and 36 months. Both parametric and non‐parametric statistics showed a temporal variation in the response of living microbes to the treatments applied. After 14 months, living microbes showed greatest response to OF, while at 36 months their response was strongest in the treatments with highest plant biomass production (B and B+S). These results suggest that in the early stages of land reclamation, living microbial biomass benefit the most from organic fertilizers. As this initial boost decline, living microbes are more likely to thrive in areas undergoing reclamation where they can develop synergistic interactions with plants.
Graphoepitaxial Assembly of Block Copolymer for Bending Stripe Patterns
Authors: Huh June , Kim Mi‐Jeong , Park Jong‐Wan 
Published: April 2019

AbstractThe formation of bend patterns using block copolymer (BCP) lamellae within trench‐type groove patterned with bend geometry is simulated by using a Monte Carlo simulation and a strong segregation theory. A tolerance of curvatures at the bend corners of the guide pattern for the formation of bent lamellae is proposed. It is found from the simulation and the strong segregation theory that the tolerance for the difference in curvature radii of two bend corners for the well‐patterned lamellar bends is proportional to the inverse of the trench width in the straight region.
Universal Size and Shape Ratios for Arms in Star‐Branched Polymers: Theory and Mesoscopic Simulations
Authors: Kalyuzhnyi Ostap , Haidukivska Khristine , Blavatska Viktoria , Ilnytskyi Jaroslav 
Published: April 2019

AbstractStar polymer undergoes a transformation from a group of loosely coupled chains at low number of arms to a dense hairy colloid at their high number. This change affects solubility, aggregation, and rheological behavior and is of much practical interest. The range of size and shape properties of the star molecule and of its individual arms upon this transformation are studied. Theoretical calculations are based on a continuous chain model and are performed in the first order in ε = 4 −d. Computer simulations are done by the dissipative particle dynamics and in part by Monte Carlo method and the results demonstrate very good agreement with the selected set of properties known from the previous simulations. Theory and simulations provide qualitatively similar trends upon increase of the number of arms, but higher order of approximation is required in a theory to achieve a good quantitative agreement.
Experimental and Theoretical Insights into the Optical Properties and Intermolecular Interactions in Push‐Pull Bromide Salts
Authors: Venkatesan Perumal , Cerón Margarita , Pérez‐Gutiérrez Enrique , Castillo Armando E. , Thamotharan Subbiah , Robles Fernando , Siegler Maxime A. , Percino M. Judith 
Published: April 2019

AbstractExperimental and theoretical insights into the nature of intermolecular interactions and their effect on optical properties of 1‐allyl‐4‐(1‐cyano‐2‐(4‐dialkylaminophenyl)vinyl)pyridin‐1‐ium bromide salts (I and II) are reported. A comparison of optical properties in solution and in the solid‐state of the salts (I and II) with their precursors (Ia and IIa) is made. The experimental absorption maxima (λmax) in CHCl3 is at 528 nm for I and at 542 nm for II, and a strong bathochromic shift of ∼110 nm is observed for salts I and II compared with their precursors. The absorption bands in solid‐state at ∼627 nm for I and at ∼615 nm for II that are assigned to charge transfer (CT) effect. The optical properties and single crystal structural features of I and II are explored by experimental and computational tools. The calculated λmax and the CT are in good agreement with the experimental results. The intermolecular interactions existing in the crystal structures and their energies are quantified for various dimers by PIXEL, QTAIM and DFT approaches. Three types of interactions, (i) the cation⋅⋅⋅cation interactions, (ii) cation⋅⋅⋅anion interactions and (iii) anion⋅⋅⋅anion interactions are observed. The cationic moiety is mainly destabilized by C−H⋅⋅⋅N/π and π⋅⋅⋅π interactions whereas the cation and anion moiety is predominantly stabilized by strong C−H⋅⋅⋅Br− interactions in both structures. The existence of charge transfer between cation and anion moieties in these structures is established through NBO analysis.
On the Uselessness of Bond Paths Linking Distant Atoms and on the Violation of the Concept of Privileged Exchange Channels
Authors: Jabłoński Mirosław 
Published: April 2019

AbstractWe refer to frequently used determinants suggesting dominant interactions between distant atoms in various dimers. First of all, we show, against the still‐prevailling opinion, that, in general, bond paths have nothing in common with dominant intermolecular interactions and therefore they are useless in such cases. Quite the contrary, reliable information about dominant intermolecular interactions can be obtained by means of electrostatic potential maps, which very convincingly explain mutual orientation of molecules in a dimer. For the first time, numerous examples of interactions that violate both the concept of privileged exchange channels proposed by Pendás and his collaborators as well as inequalities obtained by Tognetti and Joubert for theβparameter related to secondary interactions are presented. The possible cause of this violation is suggested. We also show that the so‐called counterintuitive bond paths result from quite natural behavior of the electron density gradient vector, i. e. searching for those areas of space that are characterized by large values of electron density or the most expanded its distributions.
Ball‐Mill‐Exfoliated Graphene: Tunable Electrochemistry and Phenol Sensing
Authors: Li Xiaoyu , Shen Jian , Wu Can , Wu Kangbing 
Published: April 2019

AbstractA simple wet ball‐milling method for exfoliating pristine graphite to graphene nanosheets is proposed. The surfactant of cetyltrimethyl ammonium bromide is utilized to greatly improve the exfoliation efficiency of graphene nanosheets. Variation of the ball‐milling time is an efficient way to control the size and thickness of graphene nanosheets, as well as the level of edge defects. With an increase of ball‐milling time, superior electrochemical reactivity is imparted owing to enlarged active area and increased catalytic ability. The obtained graphene nanosheets are sensitive for electrochemical oxidation of phenols (e.g., hydroquinone, p‐chlorophenol, and p‐nitrophenol), and thus qualified for the simultaneous sensing of trace level of phenols. The detection limits of simultaneous monitoring of hydroquinone, p‐chlorophenol, and p‐nitrophenol are as low as 0.017, 0.024, and 0.42 mg L−1, respectively. The proposed strategy thus opens up a new way to tune electrochemistry of graphene materials as well as to design their new applications.
Insurance risk assessment in the face of climate change: Integrating data science and statistics
Authors: Lyubchich Vyacheslav , Newlands Nathaniel K. , Ghahari Azar , Mahdi Tahir , Gel Yulia R. 
Published: April 2019

Local extreme weather events cause more insurance losses overall than large natural disasters. The evidence is provided by long‐term observations of weather and insurance records that are also a foundation for the majority of insurance products covering weather related damages. The insurers around the world are concerned, however, that the past records used to assess and price the risks underestimate the risk and incurred losses in recent years. The growing insurance risks are largely attributed to climate change that brings increasingly more alterations and permanent impact on all aspects of human life and welfare. From floods to hail to excessive wind, adverse atmospheric events are a poignant reminder of how vulnerable our society is across a broad range of threats posed by environmental extremes. Indeed, as climate change effects become more pronounced, we face a new era of risk with increasing weather related damages and losses. This in turn, coupled with challenges of massive climatic data, requires developing innovative analytic approaches that transcend traditional disciplinary boundaries of statistical, actuarial and environmental sciences. Nevertheless, the multidisciplinary nature of climate risk assessment and its impact on insurance is often overlooked and neglected. We highlight the most recent developments and interdisciplinary perspectives on diverse statistical and machine learning methodology for modeling and assessing climate risk in agricultural and home insurances, with a particular focus on noncatastrophic events.This article is categorized under:
Applications of Computational Statistics > Computational Climate Change and Numerical Weather Forecasting
Statistical and Graphical Methods of Data Analysis > Multivariate Analysis
Data: Types and Structure > Massive Data
Respect Your Neighbor as Yourself: Neighborliness, Caste, and Community in South India
Authors: Thiranagama Sharika 
Published: April 2019

AbstractThis essay explores a global and existential problem—how ordinary people live and contend with historically deep subordination, humiliation, and exclusion—through an examination of the everyday lives of formerly untouchable caste Dalit communities in Kerala, India. I look at this through the lens of neighborliness: how people discuss how theylive togetherwith other castes and classes in small town and rural Kerala. Their continuing struggles with and experiences of humiliation and subordination must be placed within the historical context of Kerala, where deep inequality previously constituted every social relationship, and where the communist movement and other important social and political transformations have radically transformed living conditions and provided new languages and possibilities of equality within the official public sphere, if not the household. Drawing from the anthropology of ethics and engaging with philosophical discussions of living with others, I scrutinizeneighborlinessas an ethical landscape for Dalits living in new kinds of neighborhoods produced by political and social transformation. In doing so, I also reflect upon the ongoing conversations and interactions within which, for Dalits, respect, dignity, and worth are at stake. The essay also suggests new ways of understanding publics that are neither private nor part of the official public, but rather are networks of houses within rural neighborhoods—what I call “private-publics,” which are constituted through gendered caste relations.
The Role of Variable Slab Dip in Driving Mantle Flow at the Eastern Edge of the Alaskan Subduction Margin: Insights From Shear‐Wave Splitting
Authors: Venereau C. M. A. , Martin‐Short R. , Bastow I. D. , Allen R. M. , Kounoudis R. 
Published: April 2019

AbstractAlaska provides an ideal tectonic setting for investigating the interaction between subduction and asthenospheric flow. Within the span of a few hundred kilometers along strike, the geometry of the subducting Pacific plate varies significantly and terminates in a sharp edge. Furthermore, the region documents a transition from subduction along the Aleutian Arc to strike‐slip faulting along the Pacific Northwest. To better understand mantle interactions within this subduction zone, we conduct an SKS shear‐wave splitting analysis on passive‐source seismic data collected between 2011 and 2018 at 239 broadband seismometers, including those from the Transportable Array. Anisotropic fast directions in the east of our study area parallel the Queen Charlotte and Fairweather transform faults, suggesting that the ongoing development of lithospheric anisotropy dominates the results there. However, our observed delay times (δt = 1–1.5 s) obtained across the study region may also imply an asthenospheric contribution to the splitting pattern. Our splitting observations exhibit slab‐parallel fast directions northwest of the trench and a rotation of fast directions around the northeastern slab edge. These observations suggest the presence of toroidal asthenospheric flow around the edge of the downgoing Pacific plate. We suggest that Wrangell Volcanic Field volcanism might be caused by mantle upwelling associated with this flow. Splitting observations closer to the trench can be explained by fossil anisotropy within the downgoing Pacific‐Yakutat plate combined with entrained subslab mantle. The geometry of the slab, including its variable dip and its abrupt eastern edge, thus plays an important role in governing mantle flow beneath Alaska.
Submarine Permafrost Map in the Arctic Modeled Using 1‐D Transient Heat Flux (SuPerMAP)
Authors: Overduin P. P. , Schneider von Deimling T. , Miesner F. , Grigoriev M. N. , Ruppel C. , Vasiliev A. , Lantuit H. , Juhls B. , Westermann S. 
Published: April 2019

AbstractOffshore permafrost plays a role in the global climate system, but observations of permafrost thickness, state, and composition are limited to specific regions. The current global permafrost map shows potential offshore permafrost distribution based on bathymetry and global sea level rise. As a first‐order estimate, we employ a heat transfer model to calculate the subsurface temperature field. Our model uses dynamic upper boundary conditions that synthesize Earth System Model air temperature, ice mass distribution and thickness, and global sea level reconstruction and applies globally distributed geothermal heat flux as a lower boundary condition. Sea level reconstruction accounts for differences between marine and terrestrial sedimentation history. Sediment composition and pore water salinity are integrated in the model. Model runs for 450 ka for cross‐shelf transects were used to initialize the model for circumarctic modeling for the past 50 ka. Preindustrial submarine permafrost (i.e., cryotic sediment), modeled at 12.5‐km spatial resolution, lies beneath almost 2.5 ×106km2of the Arctic shelf. Our simple modeling approach results in estimates of distribution of cryotic sediment that are similar to the current global map and recent seismically delineated permafrost distributions for the Beaufort and Kara seas, suggesting that sea level is a first‐order determinant for submarine permafrost distribution. Ice content and sediment thermal conductivity are also important for determining rates of permafrost thickness change. The model provides a consistent circumarctic approach to map submarine permafrost and to estimate the dynamics of permafrost in the past.