bluuebunny/crossref_metadata_2025_split huggingface dataset:
MECHANICAL RESISTANCE OF MOSO BAMBOO (Phyllostachys pubescens) PART 2: AXIAL TENSILE STRENGTH, HARDNESS AND WEAR RESISTANCE
Authors: Berndsen Rodrigo Strzelecki , Klitzke Ricardo Jorge , Batista Djeison Cesar , Do Nascimento Eduardo Mauro , Ostapiv Fabiano 
Published: October 2014

AbstractBamboo is a natural resource with a wide range of applications, especially moso bamboo (Phyllostachys pubescens Mazel ex H. de Lehaie), which is one of the most used species in the world. The main objective of this work was to determine the axial tensile strength, hardness and wear resistance of moso bamboo culms planted in Paraná, Brazil. Axial tensile strength was tested by the modification of a standard designed for wood; hardness was measured by the Brinell Test method and wear resistance was assessed by the taber abraser method. Analysis of variance with a factorial arrangement was applied to verify the effect of the treatments, resulting from the combination of three ages (one, three and five years old) and three culm positions (base, middle and top), and to check a possible interaction between these factors. No significant interaction was verified between age and position for axial tensile strength and hardness, and these properties increased as the age increased and culm position rose. Moso bamboo has potential for the flooring industry because of its low mass loss in the test of wear resistance and the satisfactory hardness when compared to other bamboo species and to traditional Brazilian timber species.Keywords: Mechanical properties; age; culm position. ResumoResistência mecânica do bambu mossô (Phyllostachys pubescens) parte 2: tração paralela às fibras, dureza e desgaste abrasivo. O bambu é um recurso natural que tem amplo espectro de utilização, destacando-se o bambu mossô (Phyllostachys pubescens Mazel ex H. de Lehaie) como uma das espécies mais utilizadas no mundo. O objetivo principal do estudo foi determinar as propriedades mecânicas de resistência à tração paralela às fibras, dureza Brinell e resistência ao desgaste abrasivo de colmos do bambu mossô. A resistência à tração paralela foi determinada modificando-se uma norma específica para madeira; a dureza foi medida pelo método de Brinell e a resistência ao desgaste abrasivo foi avaliada utilizando-se o método do taber abraser. A análise de variância em arranjo fatorial foi aplicada para verificar o efeito dos tratamentos, em que foram combinadas três idades (um, três e cinco anos) e três posições nos colmos (base, meio e topo), analisando-se a possível interação entre os fatores. Não houve interação significativa entre os fatores idade e posição para a resistência à tração paralela às fibras e a dureza Brinell, observando-se que tais propriedades aumentaram com a idade e a posição longitudinal dos colmos. O bambu mossô possui potencial para a fabricação de pisos maciços, por causa da baixa perda de massa no ensaio de resistência ao desgaste abrasivo e pela dureza satisfatória em comparação com outras espécies de bambu e espécies madeireiras tradicionais.Palavras-chave: Propriedades mecânicas; idade; posição no colmo.
Higher Education and Economic Growth in Africa
Authors: Bloom David E. , Canning David , Chan Kevin , Luca Dara Lee 
Published: October 2014

Enrollment rates for higher education in Sub-Saharan Africa are by far the lowest in the world at 6%. Yet because of conventional beliefs that tertiary education is less important for poverty reduction, the international development community has encouraged African governments’ relative neglect of higher education. This article challenges beliefs that tertiary education has little role in promoting economic growth and alleviating poverty. First, we review recent evidence that higher education can produce significant public and private benefits. Next, we analyze the relationship between tertiary education and economic growth. We find evidence that tertiary education improves technological catch-up and, in doing so, may help to maximize Africa’s potential to achieve more rapid economic growth given current constraints. Investing in tertiary education in Africa may accelerate technological diffusion, which would in turn decrease knowledge gaps and help reduce poverty in the region. We also review new developments and trends in the higher education scene in Africa. Le taux d’inscription dans l’enseignement supérieur en Afrique sub-saharienne est de loin le plus faible du monde, atteignant seulement 6%. Pourtant, parce que l’enseignement supérieur est perçu comme moins important que les enseignements primaire et secondaire pour lutter contre la pauvreté, la communauté internationale a encouragé les gouvernements africains à moins y prêter attention. Cet article conteste l’idée que l’enseignement supérieur joue un rôle peu important dans le développement économique et la lutte contre la pauvreté. Tout d’abord, nous nous intéressons à de récents résultats qui montrent que l’enseignement supérieur crée des bénéfices publics et privés. Ensuite, nous analysons la relation entre l’enseignement supérieur et la croissance économique. Nous montrons que l’enseignement supérieur permet de rattraper le retard technologique et, ce faisant, pourrait aider l’Afrique à maximiser sa capacité à accélérer sa croissance économique dans les conditions actuelles. Investir dans l’enseignement supérieur en Afrique pourrait permettre une diffusion plus rapide des avancées technologiques, qui pourrait à son tour réduire la disparité de savoir et participer à la réduction de la pauvreté dans la région. Nous passons aussi en revue les nouveautés et tendances dans l’enseignement supérieur africain.
Artillery Through the Ages: An etymology
Authors: Morton Kevin 
Published: October 2014

This paper examines the etymology of the word artillery, following its various uses throughout its history in the English language to discover how it entered common parlance and how its meaning has changed. Using the Oxford English Dictionary as the primary source for definitions and references to other works, the brief essay traces the word's evolution from a French loan to a naturalized English word. Multiple definitions are examined, with a number of its historical literary appearances addressed and explained. Textual references are largely culled from Middle English works from the 15th-17th centuries, though the essay ends with a brief discussion of the word's modern uses. Artillery seems to have undergone merely a narrowing of meaning in the centuries since its first appearance, and not a particularly drastic one; its current meaning is quite similar, or at least strongly related, to that of the 14th century.
Le Parlement, les tribunaux et la Charte canadienne des droits et libertés
Authors: Roy Marc-André 
Published: October 2014

Le privilège parlementaire, essentiel au bon fonctionnement du parlementarisme canadien, est trop souvent mal compris par les tribunaux, mais également par les parlementaires eux-mêmes, qui vont parfois l’invoquer de manière abusive. Depuis l’avènement de la Charte canadienne des droits et libertés, les tribunaux tentent, avec un succès mitigé, de réconcilier le privilège parlementaire avec les droits et libertés constitutionnels. À l’aide d’une étude de la jurisprudence et de la doctrine, l’auteur analyse de manière critique le modèle canadien de privilège parlementaire. Il tente tout d’abord de bien comprendre les bases historiques et constitutionnelles du privilège au Canada. Par la suite, il circonscrit les principaux problèmes de l’approche de la Cour suprême du Canada en la matière pour ensuite proposer des pistes de solution, adressées aux tribunaux, mais aussi aux parlementaires, afin de mieux adapter le privilège parlementaire aux réalités du xxie siècle.
Molecular Diagnosis of Duchenne Muscular Dystrophy
Authors: Nallamilli Babi Ramesh Reddy , Ankala Arunkanth , Hegde Madhuri 
Published: October 2014

AbstractDuchenne Muscular Dystrophy (DMD) is an X‐linked inherited neuromuscular disorder caused by mutations in the dystrophin gene (DMD; locus Xp21.2). The mutation spectrum of DMD is unique in that 65% of causative mutations are intragenic deletions, with intragenic duplications and point mutations (along with other sequence variants) accounting for 6% to 10% and 30% to 35%, respectively. The strategy for molecular diagnostic testing for DMD involves initial screening for deletions/duplications using microarray‐based comparative genomic hybridization (array‐CGH) followed by full‐sequence analysis of DMD for sequence variants. Recently, next‐generation sequencing (NGS)–based targeted gene analysis has become clinically available for detection of point mutations and other sequence variants (small insertions, deletions, and indels). This unit initially discusses the strategic algorithm for establishing a molecular diagnosis of DMD and later provides detailed protocols of current molecular diagnostic methods for DMD, including array‐CGH, PCR‐based Sanger sequencing, and NGS‐based sequencing assay. Curr. Protoc. Hum. Genet. 83:9.25.1‐9.25.29 © 2014 by John Wiley & Sons, Inc.
Mouse Genome Editing Using the CRISPR/Cas System
Authors: Harms Donald W. , Quadros Rolen M. , Seruggia Davide , Ohtsuka Masato , Takahashi Gou , Montoliu Lluis , Gurumurthy Channabasavaiah B. 
Published: October 2014

AbstractThe availability of techniques to create desired genetic mutations has enabled the laboratory mouse as an extensively used model organism in biomedical research including human genetics. A new addition to this existing technical repertoire is the CRISPR/Cas system. Specifically, this system allows editing of the mouse genome much more quickly than the previously used techniques, and, more importantly, multiple mutations can be created in a single experiment. Here we provide protocols for preparation of CRISPR/Cas reagents and microinjection into one‐cell mouse embryos to create knockout or knock‐in mouse models. Curr. Protoc. Hum. Genet. 83:15.7.1‐15.7.27. © 2014 by John Wiley & Sons, Inc.
Diagnosing Lysosomal Storage Disorders: The GM2 Gangliosidoses
Authors: Hall Patricia , Minnich Sara , Teigen Claire , Raymond Kimiyo 
Published: October 2014

AbstractThe GM2 gangliosidoses are a group of autosomal recessive lysosomal storage disorders caused by defective β‐hexosaminidase. There are three clinical conditions in this group: Tay‐Sachs disease (TSD), Sandhoff disease (SD), and hexosaminidase activator deficiency. The three conditions are clinically indistinguishable. TSD and SD have been identified with infantile, juvenile, and adult onset forms. The activator deficiency is only known to present with infantile onset. Diagnosis of TSD and SD is based on decreased hexosaminidase activity and a change in the percentage of activity between isoforms. There are no biochemical tests currently available for activator deficiency. This unit provides a detailed procedure for identifying TSD and SD in affected individuals and carriers from leukocyte samples, the most robust sample type available. Curr. Protoc. Hum. Genet. 83:17.16.1‐17.16.8. © 2014 by John Wiley & Sons, Inc.
European glacial dust deposits: Geochemical constraints on atmospheric dust cycle modeling
Authors: Rousseau Denis‐Didier , Chauvel Catherine , Sima Adriana , Hatté Christine , Lagroix France , Antoine Pierre , Balkanski Yves , Fuchs Markus , Mellett Claire , Kageyama Masa , Ramstein Gilles , Lang Andreas 
Published: October 2014

AbstractFor a long time global paleodust numerical simulations have greatly underestimated dust sources other than modern deserts. Recent modeling experiments incorporating glaciogenic sources of dust have positively improved the agreement between model and paleodust data. This highlights the importance of accurately representing all areas potentially subjected to deflation during an investigated interval. Geochemical results, obtained from European loess sequences collected along a 50°N transect, combined with dust emission simulations reveal the geographical distribution of the most important European dust sources between 34 ka and 18 ka. We demonstrate that most European dust traveled only a few hundred kilometers or less within the boundary layer from its source before deposition. We conclude that our results encourage acquisition of similar geochemical data for other relevant areas in the world. Further, they could provide critical constraints to benchmark atmospheric models, contributing to improve their performance in simulating dust cycle and associated climate feedbacks.
Periodic behavior of soil CO2 emissions in diffuse degassing areas of the Azores archipelago: Application to seismovolcanic monitoring
Authors: Viveiros Fátima , Vandemeulebrouck Jean , Rinaldi Antonio P. , Ferreira Teresa , Silva Catarina , Cruz José V. 
Published: October 2014

AbstractTime series of soil CO2 efflux recorded in the Azores archipelago volcanic‐hydrothermal areas feature daily and seasonal variations. The recorded CO2 efflux values were lower during summer than in the winter season. The diurnal CO2 efflux values were higher at dawn and lower in the early afternoon, contrary to that observed in biogenic environments. CO2 efflux cycles correlated well with the environmental variables, such as air temperature, wind speed, and barometric pressure, which also showed low‐ and high‐frequency periodicities. Several simulations were performed here using the Transport of Unsaturated Groundwater and Heat 2 (TOUGH2) geothermal simulator to complement the study of Rinaldi et al. (2012). The effects of the water table depth, air temperature perturbation amplitude, and soil thermal gradient contributed to an explanation of the contrasts observed in the diurnal (S1) and semidiurnal (S2) soil CO2 efflux peaks for the different monitoring sites and seasons. Filtering techniques (multivariate regression analysis and fast Fourier transform filters) were also applied to the recorded time series to remove effects of external variables on the soil CO2 efflux. The resulting time series (the residuals) correspond to the best approach to the deep‐seated (volcanic/hydrothermal) CO2 emissions and thus should be used in seismovolcanic monitoring programs. Even if no evident correlation can be established yet between the soil CO2 residuals and seismicity over the monitored time, a seismic swarm that occurred around the end of 2008 might have triggered some deviations from the observed daily cycles.
Basal mass budget of Ross and Filchner‐Ronne ice shelves, Antarctica, derived from Lagrangian analysis of ICESat altimetry
Authors: Moholdt Geir , Padman Laurie , Fricker Helen Amanda 
Published: October 2014

AbstractTraditional methods of deriving temporal variability of Antarctic ice‐shelf elevation from satellite altimetry use a fixed (“Eulerian”) reference frame, where the measured changes include advection of ice thickness gradients between measurement epochs. We present a new method which removes advection effects by using an independent velocity field to compare elevations in a moving (“Lagrangian”) reference frame. Applying the technique to ICESat laser altimetry for the period 2003–2009 over the two largest Antarctic ice shelves, Ross and Filchner‐Ronne, we show that the Lagrangian approach reduces the variability of derived elevation changes by about 50% compared to the Eulerian approach and reveals clearer spatial patterns of elevation change. The method simplifies the process of estimating basal mass budget from the residual of all other processes that contribute to ice‐shelf elevation changes. We use field data and ICESat measurements over ice rises and the grounded ice sheet to account for surface accumulation and changes in firn air content, and remove the effect of ice‐flow divergence using surface velocity and ice thickness data. The results show highest basal melt rates (>5 m a−1) near the deep grounding lines of major ice streams, but smaller melt rates (<5 m a−1) near the ice‐shelf fronts are equally important to total meltwater production since they occur over larger areas. Integrating over the entire ice‐shelf areas, we obtain basal mass budgets of −50 ± 64 Gt a−1 for Ross and −124 ± 66 Gt a−1 for Filchner‐Ronne, with changes in firn air content as the largest error source.
Temporal variability of carbon and nutrient burial, sediment accretion, and mass accumulation over the past century in a carbonate platform mangrove forest of the Florida Everglades
Authors: Breithaupt Joshua L. , Smoak Joseph M. , Smith Thomas J. , Sanders Christian J. 
Published: October 2014

AbstractThe objective of this research was to measure temporal variability in accretion and mass sedimentation rates (including organic carbon (OC), total nitrogen (TN), and total phosphorous (TP)) from the past century in a mangrove forest on the Shark River in Everglades National Park, USA. The 210Pb Constant Rate of Supply model was applied to six soil cores to calculate annual rates over the most recent 10, 50, and 100 year time spans. Our results show that rates integrated over longer timeframes are lower than those for shorter, recent periods of observation. Additionally, the substantial spatial variability between cores over the 10 year period is diminished over the 100 year record, raising two important implications. First, a multiple‐decade assessment of soil accretion and OC burial provides a more conservative estimate and is likely to be most relevant for forecasting these rates relative to long‐term processes of sea level rise and climate change mitigation. Second, a small number of sampling locations are better able to account for spatial variability over the longer periods than for the shorter periods. The site average 100 year OC burial rate, 123 ± 19 (standard deviation) g m−2 yr−1, is low compared with global mangrove values. High TN and TP burial rates in recent decades may lead to increased soil carbon remineralization, contributing to the low carbon burial rates. Finally, the strong correlation between OC burial and accretion across this site signals the substantial contribution of OC to soil building in addition to the ecosystem service of CO2 sequestration.
Equatorial Pacific coral geochemical records show recent weakening of the Walker Circulation
Authors: Carilli Jessica E. , McGregor Helen V. , Gaudry Jessica J. , Donner Simon D. , Gagan Michael K. , Stevenson Samantha , Wong Henri , Fink David 
Published: October 2014

AbstractEquatorial Pacific ocean‐atmosphere interactions affect climate globally, and a key component of the coupled system is the Walker Circulation, which is driven by sea surface temperature (SST) gradients across the equatorial Pacific. There is conflicting evidence as to whether the SST gradient and Walker Circulation have strengthened or weakened over the late twentieth century. We present new records of SST and sea surface salinity (SSS) spanning 1959–2010 based on paired measurements of Sr/Ca and δ18O in a massive Porites coral from Butaritari atoll in the Gilbert Islands, Republic of Kiribati, in the central western equatorial Pacific. The records show 2–7 year variability correlated with the El Niño–Southern Oscillation (ENSO) and corresponding shifts in the extent of the Indo‐Pacific Warm Pool, and decadal‐scale signals related to the Pacific Decadal Oscillation and the Pacific Warm Pool Index. In addition, the Butaritari coral records reveal a small but significant increase in SST (0.39°C) from 1959 to 2010 with no accompanying change in SSS, a trend that persists even when ENSO variability is removed. In contrast, larger increases in SST and SSS are evident in coral records from the equatorial Pacific Line Islands, located east of Butaritari. Taken together, the equatorial Pacific coral records suggest an overall reduction in the east‐west SST and SSS gradient over the last several decades, and a recent weakening of the Walker Circulation.
I/Ca evidence for upper ocean deoxygenation during the PETM
Authors: Zhou Xiaoli , Thomas Ellen , Rickaby Rosalind E. M. , Winguth Arne M. E. , Lu Zunli 
Published: October 2014

AbstractAnthropogenic global warming affects marine ecosystems in complex ways, and declining ocean oxygenation is a growing concern. Forecasting the geographical and bathymetric extent, rate, and intensity of future deoxygenation and its effects on oceanic biota, however, remains highly challenging because of the complex feedbacks in the Earth‐ocean biota system. Information on past global warming events such as the Paleocene‐Eocene Thermal Maximum (PETM, ~55.5 Ma), a potential analog for present and future global warming, may help in such forecasting. Documenting past ocean deoxygenation, however, is hampered by the lack of sensitive proxies for past oceanic oxygen levels throughout the water column. As yet no evidence has been presented for pervasive deoxygenation in the upper water column through expansion of oxygen minimum zones (OMZs). We apply a novel proxy for paleoredox conditions, the iodine to calcium ratio (I/Ca) in bulk coarse fraction sediment and planktonic foraminiferal tests from pelagic sites in different oceans, and compared our reconstruction with modeled oxygen levels. The reconstructed iodate gradients indicate that deoxygenation occurred in the upper water column in the Atlantic, Indian Oceans, and possibly the Pacific Ocean, as well during the PETM, due to vertical and potentially lateral expansion of OMZs.
Enantioselective Fluorination of β‐Ketoamides Catalyzed by Ar‐BINMOL‐derived SalanCopper Complex
Authors: Zheng Long‐Sheng , Wei Yun‐Long , Jiang Ke‐Zhi , Deng Yuan , Zheng Zhan‐Jiang , Xu Li‐Wen 
Published: October 2014

AbstractA facile and powerful enantioselective construction of CF containing molecules was successfully developed through asymmetric fluorination of β‐ketoamides catalyzed by Ar‐BINMOL‐derived salan–CuII system (Ar‐BINMOL=1,1′‐Binaphthalene‐2‐α‐arylmethanol‐2′‐ol, Cu = copper). The present catalytic system exhibited excellent enantioselectivity and a broad substrate scope for indanone‐derived β‐ketoamides under mild conditions (up to 99 % ee and 99 % yields). Notably, the biomimetic salan‐copper complex was demonstrated for the first time to be a highly efficient catalyst in the fluorination of β‐ketoamides. Experimental results and mechanistic studies indicated that both excess amount of copper salt and electrophilic attack of cationic fluorine to activated methylene assisted by amide group on the β‐ketoamides were key factors for high yield and excellent enantioselectivity, respectively, in this enantioselective fluorination, which was controlled by the two‐point binding between the salan–copper complex with cyclic β‐ketoamides and hydrogen‐bonding activation of the electrophilic fluorinating reagent.magnified image