bluuebunny/crossref_metadata_2025 huggingface dataset:
Morse boundaries of proper geodesic metric spaces
Authors: Cordes Matthew
Published: December 2017

We introduce a new type of boundary for proper geodesic spaces, called the Morse boundary, that is constructed with rays that identify the “hyperbolic directions” in that space. This boundary is a quasi-isometry invariant and thus produces a well-defined boundary for any finitely generated group. In the case of a proper CAT(0) space this boundary is the contracting boundary of Charney and Sultan, and in the case of a proper Gromov hyperbolic space this boundary is the Gromov boundary. We prove three results about the Morse boundary of Teichmüller space. First, we show that the Morse boundary of the mapping class group of a surface is homeomorphic to the Morse boundary of the Teichmüller space of that surface. Second, using a result of Leininger and Schleimer, we show that Morse boundaries of Teichmüller space can contain spheres of arbitrarily high dimension. Finally, we show that there is an injective continuous map of the Morse boundary of Teichmüller space into the Thurston compactication of Teichmüller space by projective measured foliations.
Asymptotic shapes for ergodic families of metrics on Nilpotent groups
Authors: Cantrell Michael , Furman Alex
Published: December 2017

Let

\Gamma

be a finitely generated virtually nilpotent group. We consider three closely related problems: (i) convergence to a deterministic asymptotic cone for an equivariant ergodic family of inner metrics on

\Gamma

, generalizing Pansu's theorem; (ii) the asymptotic shape theorem for first passage percolation for general (not necessarily independent) ergodic processes on edges of a Cayley graph of

\Gamma

; (iii) the sub-additive ergodic theorem over a general ergodic

\Gamma

-action. The limiting objects are given in terms of a Carnot–Carathéodory metric on the graded nilpotent group associated to the Mal'cev completion of

\Gamma

.
Which geodesic flows are left-handed?
Authors: Dehornoy Pierre
Published: December 2017

We prove that the geodesic flow on the unit tangent bundle to a hyperbolic 2-orbifold is left-handed if and only if the orbifold is a sphere with three cone points. As a consequence, on the unit tangent bundle to a 3-conic sphere, the lift of every finite collection of closed geodesics is a fibered link.
Abstract operator-valued Fourier transforms over homogeneous spaces of compact groups
Authors: Ghaani Farashahi Arash
Published: December 2017

This paper presents a systematic theoretical study for the abstract notion of operator-valued Fourier transforms over homogeneous spaces of compact groups. Let

G

be a compact group,

H

be a closed subgroup of

G

, and

\mu

be the normalized

G

-invariant measure over the left coset space

G/H

associated to the Weil's formula. We introduce the generalized notions of abstract dual homogeneous space

\widehat{G/H}

for the compact homogeneous space

G/H

and also the operator-valued Fourier transform over the Banach function space

L^1(G/H,\mu)

. We prove that the abstract Fourier transform over

G/H

satisfies the Plancherel formula and the Poisson summation formula.
Organizational Resilience and Performance: An Analysis of the Relevance of Suppliers’ Trade Credit and Bank Diversification in the Spanish Construction Industry
Authors: Lafuente Esteban , Strassburger Felipe , Vaillant Yancy , Vilajosana Jordi
Published: December 2017

The objective of this study is to determine the effect of relevant variables related to strategic sources of financial resources—in our case, suppliers’ trade credit and use of financial institutions—over performance among Spanish construction firms. To test the proposed hypotheses, we employ panel-data techniques on a large dataset that includes information for 3590 Spanish small (1723), medium-sized (1616) and large (251) construction businesses during 2004-2011. The results of the longitudinal analysis reveal that trade credit granted by suppliers constitute a relevant source of liquidity and financial resources that positively impacts economic performance. During the period of economic downturn that affected Spain after 2008, those construction firms that benefited from longer average payment periods from their suppliers reported superior performance levels. Additionally, we find that bank diversification is conducive to performance but only during the crisis period: performance is significantly higher in businesses that work with a greater number of financial institutions.
Release of Construction Clients’ Pre-tender Cost Estimates: An Experimental Study
Authors: Oo Bee Lan
Published: December 2017

Clients engage consultant quantity surveyors or cost engineers to perform project cost estimates before calling for tender submissions. This experimental study examines the impact of releasing the clients’ pre-tender cost estimates prior to bidding on student subjects’ bidding behavioural patterns, and the extents to which their bidding tends to agree with the behavioural patterns proposed by Milgrom and Weber’s theory. The results show that the provision of clients’ pre-tender cost estimates prior to bidding does affect bidders’ bidding behaviour. Bidders with access to the clients’ pre-tender cost estimates prior to bidding, on average, recorded lower bids than those with no access to the estimate. However, the lower average bids do not result in statistically significant lower winning bids. These findings provide evidence in support of Milgrom and Weber’s theory, demonstrating the practicality of an experimental approach using student subjects for testing theories in building economics research. The practical implication is that construction clients would need to consider their information policy on releasing pre-tender cost estimates to enhance efficiency in their procurement for construction services.
Impacts of meteorological uncertainties on the haze formation in Beijing–Tianjin–Hebei (BTH) during wintertime: a case study
Authors: Bei Naifang , Wu Jiarui , Elser Miriam , Feng Tian , Cao Junji , El-Haddad Imad , Li Xia , Huang Rujin , Li Zhengqiang , Long Xin , Xing Li , Zhao Shuyu , Tie Xuexi , Prévôt André S. H. , Li Guohui
Published: December 2017

Abstract. In the present study, a persistent heavy haze episode from 13 to 20 January 2014 in Beijing–Tianjin–Hebei (BTH) is simulated using the WRF-CHEM model through ensemble simulations to investigate impacts of meteorological uncertainties on the haze formation. Model results show that uncertainties in meteorological conditions substantially influence the aerosol constituent simulations at an observation site in Beijing, and the ratio of the ensemble spread to the ensemble mean (RESM) exceeds 50 %. The ensemble mean generally preforms well in reproducing the fine particles' (PM2.5) temporal variations and spatial distributions against measurements in BTH. The meteorological uncertainties do not alter the PM2.5 distribution pattern in BTH principally or dominate the haze formation and development, but remarkably affect the simulated PM2.5 level, and the RESM for the simulated PM2.5 concentrations can be up to 30 % at the regional scale. In addition, the rather large RESM in PM2.5 simulations at the city scale also causes difficulties in evaluation of the control strategies. Therefore, our results suggest that the ensemble simulation is imperative to take into account the impact of the meteorological uncertainties on the haze prediction.
Climatology and interannual variability of dynamic variables in multiple reanalyses evaluated by the SPARC Reanalysis Intercomparison Project (S-RIP)
Authors: Long Craig S. , Fujiwara Masatomo , Davis Sean , Mitchell Daniel M. , Wright Corwin J.
Published: December 2017

Abstract. Two of the most basic parameters generated from a reanalysis are temperature and winds. Temperatures in the reanalyses are derived from conventional (surface and balloon), aircraft, and satellite observations. Winds are observed by conventional systems, cloud tracked, and derived from height fields, which are in turn derived from the vertical temperature structure. In this paper we evaluate as part of the SPARC Reanalysis Intercomparison Project (S-RIP) the temperature and wind structure of all the recent and past reanalyses. This evaluation is mainly among the reanalyses themselves, but comparisons against independent observations, such as HIRDLS and COSMIC temperatures, are also presented. This evaluation uses monthly mean and 2.5° zonal mean data sets and spans the satellite era from 1979–2014. There is very good agreement in temperature seasonally and latitudinally among the more recent reanalyses (CFSR, MERRA, ERA-Interim, JRA-55, and MERRA-2) between the surface and 10 hPa. At lower pressures there is increased variance among these reanalyses that changes with season and latitude. This variance also changes during the time span of these reanalyses with greater variance during the TOVS period (1979–1998) and less variance afterward in the ATOVS period (1999–2014). There is a distinct change in the temperature structure in the middle and upper stratosphere during this transition from TOVS to ATOVS systems. Zonal winds are in greater agreement than temperatures and this agreement extends to lower pressures than the temperatures. Older reanalyses (NCEP/NCAR, NCEP/DOE, ERA-40, JRA-25) have larger temperature and zonal wind disagreement from the more recent reanalyses. All reanalyses to date have issues analysing the quasi-biennial oscillation (QBO) winds. Comparisons with Singapore QBO winds show disagreement in the amplitude of the westerly and easterly anomalies. The disagreement with Singapore winds improves with the transition from TOVS to ATOVS observations. Temperature bias characteristics determined via comparisons with a reanalysis ensemble mean (MERRA, ERA-Interim, JRA-55) are similarly observed when compared with Aura HIRDLS and Aura MLS observations. There is good agreement among the NOAA TLS, SSU1, and SSU2 Climate Data Records and layer mean temperatures from the more recent reanalyses. Caution is advised for using reanalysis temperatures for trend detection and anomalies from a long climatology period as the quality and character of reanalyses may have changed over time.
Total electron content responses to HILDCAAs and geomagnetic storms over South America
Authors: de Siqueira Negreti Patricia Mara , de Paula Eurico Rodrigues , Candido Claudia Maria Nicoli
Published: December 2017

Abstract. Total electron content (TEC) is extensively used to monitor the ionospheric behavior under geomagnetically quiet and disturbed conditions. This subject is of greatest importance for space weather applications. Under disturbed conditions the two main sources of electric fields, which are responsible for changes in the plasma drifts and for current perturbations, are the short-lived prompt penetration electric fields (PPEFs) and the longer-lasting ionospheric disturbance dynamo (DD) electric fields. Both mechanisms modulate the TEC around the globe and the equatorial ionization anomaly (EIA) at low latitudes. In this work we computed vertical absolute TEC over the low latitude of South America. The analysis was performed considering HILDCAA (high-intensity, long-duration, continuous auroral electrojet (AE) activity) events and geomagnetic storms. The characteristics of storm-time TEC and HILDCAA-associated TEC will be presented and discussed. For both case studies presented in this work (March and August 2013) the HILDCAA event follows a geomagnetic storm, and then a global scenario of geomagnetic disturbances will be discussed. Solar wind parameters, geomagnetic indices, O ∕ N2 ratios retrieved by GUVI instrument onboard the TIMED satellite and TEC observations will be analyzed and discussed. Data from the RBMC/IBGE (Brazil) and IGS GNSS networks were used to calculate TEC over South America. We show that a HILDCAA event may generate larger TEC differences compared to the TEC observed during the main phase of the precedent geomagnetic storm; thus, a HILDCAA event may be more effective for ionospheric response in comparison to moderate geomagnetic storms, considering the seasonal conditions. During the August HILDCAA event, TEC enhancements from  ∼  25 to 80 % (compared to quiet time) were observed. These enhancements are much higher than the quiet-time variability observed in the ionosphere. We show that ionosphere is quite sensitive to solar wind forcing and considering the events studied here, this was the most important source of ionospheric responses. Furthermore, the most important source of TEC changes were the long-lasting PPEFs observed on August 2013, during the HILDCAA event. The importance of this study relies on the peculiarity of the region analyzed characterized by high declination angle and ionospheric gradients which are responsible for creating a complex response during disturbed periods.
Exploring the contributions of vegetation and dune size to early dune development using unmanned aerial vehicle (UAV) imaging
Authors: van Puijenbroek Marinka E. B. , Nolet Corjan , de Groot Alma V. , Suomalainen Juha M. , Riksen Michel J. P. M. , Berendse Frank , Limpens Juul
Published: December 2017

Abstract. Dune development along highly dynamic land–sea boundaries is the result of interaction between vegetation and dune size with sedimentation and erosion processes. Disentangling the contribution of vegetation characteristics from that of dune size would improve predictions of nebkha dune development under a changing climate, but has proven difficult due to the scarcity of spatially continuous monitoring data. This study explored the contributions of vegetation and dune size to dune development for locations differing in shelter from the sea. We monitored a natural nebkha dune field of 8 ha, along the coast of the island Texel, the Netherlands, for 1 year using an unmanned aerial vehicle (UAV) with camera. After constructing a digital surface model and orthomosaic we derived for each dune (1) vegetation characteristics (species composition, vegetation density, and maximum vegetation height), (2) dune size (dune volume, area, and maximum height), (3) degree of shelter (proximity to other nebkha dunes and the sheltering by the foredune). Changes in dune volume over summer and winter were related to vegetation, dune size and degree of shelter. We found that a positive change in dune volume (dune growth) was linearly related to initial dune volume over summer but not over winter. Big dunes accumulated more sand than small dunes due to their larger surface area. Exposed dunes increased more in volume (0.81 % per dune per week) than sheltered dunes (0.2 % per dune per week) over summer, while the opposite occurred over winter. Vegetation characteristics did not significantly affect dune growth in summer, but did significantly affect dune growth in winter. Over winter, dunes dominated by Ammophila arenaria, a grass species with high vegetation density throughout the year, increased more in volume than dunes dominated by Elytrigia juncea, a grass species with lower vegetation density (0.43 vs. 0.42 (m3 m−3) week−1). The effect of species was irrespective of dune size or distance to the sea. Our results show that dune growth in summer is mainly determined by dune size, whereas in winter dune growth was determined by vegetation type. In our study area the growth of exposed dunes was likely restricted by storm erosion, whereas growth of sheltered dunes was restricted by sand supply. Our results can be used to improve models predicting coastal dune development.
Bumps in river profiles: uncertainty assessment and smoothing using quantile regression techniques
Authors: Schwanghart Wolfgang , Scherler Dirk
Published: December 2017

Abstract. The analysis of longitudinal river profiles is an important tool for studying landscape evolution. However, characterizing river profiles based on digital elevation models (DEMs) suffers from errors and artifacts that particularly prevail along valley bottoms. The aim of this study is to characterize uncertainties that arise from the analysis of river profiles derived from different, near-globally available DEMs. We devised new algorithms – quantile carving and the CRS algorithm – that rely on quantile regression to enable hydrological correction and the uncertainty quantification of river profiles. We find that globally available DEMs commonly overestimate river elevations in steep topography. The distributions of elevation errors become increasingly wider and right skewed if adjacent hillslope gradients are steep. Our analysis indicates that the AW3D DEM has the highest precision and lowest bias for the analysis of river profiles in mountainous topography. The new 12 m resolution TanDEM-X DEM has a very low precision, most likely due to the combined effect of steep valley walls and the presence of water surfaces in valley bottoms. Compared to the conventional approaches of carving and filling, we find that our new approach is able to reduce the elevation bias and errors in longitudinal river profiles.
A study of the Würm glaciation focused on the Valais region (Alps)
Authors: Becker Patrick , Funk Martin , Schlüchter Christian , Hutter Kolumban
Published: December 2017

Abstract. During the Last Glacial Maximum (LGM), the glaciation in the European Alps reached maximum ice extent. We already simulated the steady states of the Alpine ice coverage for several climate drivers in Becker et al. (2016) and heighten in this article such studies for the Swiss Valais region. To this end, we employ the Parallel Ice Sheet Model (PISM), which combines the shallow ice approximation (SIA) with basal sliding elements of the shallow shelf approximation (SSA), and subject this model to various external driving mechanisms. We further test the sensitivity of this kind of the ice coverage in the Valais region to a temporally constant climate and to monotonic ice sheet build-up from inception to steady state as well as to the Dye 3 temperature driving during the past 120 000 years. We also test differences in the precipitation patterns exerted to the northern and southern catchment areas of the Rhone and Toce rivers to possible transfluence changes in ice from the northern to the southern catchment areas and vice versa. Moreover, we study the effect of the ice deformability and estimate the removal up to 1000 m of sediment in the Rhone Valley and study the removal of rock hindering the flow through the valley cross section at the knee of Martigny. All these studies took place because of a discrepancy in the ice height prediction of the modelled ice sheet with its geomorphologically reconstructed counterpart with proxy data obtained by Bini et al. (2009) as well as a difference in ice height between the two of up to 800 m. Unfortunately, all the scenarios in the model do not sufficiently reduce this discrepancy in the height prediction and the geomorphological reconstruction. The model results have discovered an ice dynamical discrepancy with the land map in Bini et al. (2009).
A pore-size classification for peat bogs derived from unsaturated hydraulic properties
Authors: Weber Tobias Karl David , Iden Sascha Christian , Durner Wolfgang
Published: December 2017

Abstract. In ombrotrophic peatlands, the moisture content of the acrotelm (vadoze zone) controls oxygen diffusion rates, redox state, and the turnover of organic matter. Thus, variably saturated flow processes determine whether peatlands act as sinks or sources of atmospheric carbon, and modelling these processes is crucial to assess effects of changed environmental conditions on the future development of these ecosystems. We show that the Richards equation can be used to accurately describe the moisture dynamics under evaporative conditions in variably saturated peat soil, encompassing the transition from the topmost living moss layer to the decomposed peat as part of the vadose zone. Soil hydraulic properties (SHP) were identified by inverse simulation of evaporation experiments on samples from the entire acrotelm. To obtain consistent descriptions of the observations, the traditional van Genuchten–Mualem model was extended to account for non-capillary water storage and flow. We found that the SHP of the uppermost moss layer reflect a pore-size distribution (PSD) that combines three distinct pore systems of the Sphagnum moss. For deeper samples, acrotelm pedogenesis changes the shape of the SHP due to the collapse of inter-plant pores and an infill with smaller particles. This leads to gradually more homogeneous and bi-modal PSDs with increasing depth, which in turn can serve as a proxy for increasing state of pedogenesis in peatlands. From this, we derive a nomenclature and size classification for the pore spaces of Sphagnum mosses and define inter-, intra-, and inner-plant pore spaces, with effective pore diameters of >  300, 300–30, and 30–10 µm, respectively.
Cannabis and Amphetamine Use Among Adolescents in Five Asian Countries
Authors: Peltzer Karl , Pengpid Supa
Published: December 2017

Introduction: There has been a global increase in illicit drug use among young people. The aim of this study was to estimate the prevalence of lifetime cannabis and amphetamine use, as well as to explore factors associated with substance use among adolescents in five Asian countries: Iraq, Kuwait, Malaysia, Mongolia, and Vietnam.Methods: 38,941  school children (mean age 15.4 years, SD=1.5) completed the cross-sectional Global School-Based Student Health Survey (GSHS). Topics covered in the questionnaire included cannabis and amphetamine use. Personal, parental, and environmental attributes were explored as predictors of cannabis and amphetamine use. Logistic regression was used to assess the contribution of potential predictors on lifetime cannabis and lifetime amphetamine use.Results: Overall, the prevalence of lifetime cannabis use was 0.9% and lifetime amphetamine use was 1.0% among research participants. Cannabis use was influenced by male gender (Kuwait, Mongolia), parental smoking habits (Kuwait, Iraq), and current cigarette smoking in all countries. Amphetamine use was associated with suicidal ideation (Kuwait, Malaysia, Vietnam), school truancy (Malaysia, Mongolia, Vietnam), being a victim of physical assault (Kuwait, Mongolia), bullying victimization (Iraq, Malaysia, Vietnam), as well as anxiety and current cigarette use in all countries. Conclusions: Our preliminary results show the importance of personal attributes such as mental distress and environmental stressors on lifetime cannabis and lifetime amphetamine use. Future prospective studies are needed to identify causal relationships among personal attributes, parental attributes, environmental stressors, and illicit substance use.
A FORMAÇÃO DO TRABALHADOR E DA TRABALHADORA NUMA PERSPECTIVA FREIREANA
Authors: Amorim Rodrigo De Freitas
Published: December 2017

Por meio da pesquisa bibliográfica dos escritos do próprio Freire procurou-se encontrar as categorias fundantes para uma reflexão crítica da formação profissional do trabalhador de modo a delinear o que seja um caminho libertador e emancipador para a formação do trabalhador na atualidade, diante de um contexto de políticas públicas que reproduzem as tendências do mercado de capital. A partir da categoria do ser sujeito, demonstra-se como o trabalhador constitui-se ator de sua história e criador de seu mundo; nas categorias do tema-gerador, do diálogo, da educação como prática da liberdade, demonstra-se que o sentido da expressão formação do trabalhador só pode ser compreendido em sua dimensão libertadora; e, nas categorias da participação, do engajamento, da militância, da educação como ato político, demonstra-se que uma formação libertadora resulta na atuação consciente do trabalhador sobre o mundo vivido para transformá-lo.
CORPO, CULTURA E PAULO FREIRE: A CAPOEIRA COMO POSSIBILIDADE DE UMA EDUCAÇÃO NA PERSPECTIVA DA EMANCIPAÇÃO HUMANA
Authors: Schroeder Anastácia , Lopes Vieira Joana Rita , Silva Maria Cecília De Paula
Published: December 2017

O presente artigo, de base teórica, objetiva relacionar conceitos freirianos de ser mais, conscientização, liberdade, ler o mundo, situações limite, oprimido opressor,  com os fundamentos e o universo simbólico da Capoeira, manifestação cultural afro-brasileira de luta e resistência de povos historicamente marginalizados, a fim de apresentar possibilidades de uma educação libertária a partir da Cultura. Por apresentar fundamentos configurados na corporeidade e em simbologias, como as cantigas, que conferem pertencimento social e histórico, além da valorização positiva de identidades historicamente silenciadas, a prática da capoeira configura-se como potencial manifestação cultural em direção ao Ser Mais, levando a inserção crítica de oprimidos na realidade, para que nela atuem voltados a emancipação humana.
Identifying the Functions of Code Switching in a Computer Mediated Online Communication
Authors: Dawoud Areej , Rashid Shah Sayyed
Published: December 2017

This study aims to explore the functions of code switching of English-Arabic speakers in a computer-based online communication. Its goal is to understand whether code switching on the internet has the same functions as face-to-face interaction in real time situation. In addition, it aims to highlight the different conversational characteristics of code switching in a virtual environment, such as online chat. Adopting a Conversational Analysis (CA) approach, the data were collected from online Paltalk chatrooms, specifically "BnatKSA". The six participants, three males and three females were proficient in English and Arabic languages. Using bidirectional English-Arabic code switching, the six participants frequently chatted online for two hours a day over a period of one month. The findings indicate a wide range of functions of code switching on the internet. Some of these functions are unique and context specific, which can be considered a contribution to the body of knowledge. The findings suggest that the range of code switching functions online is broader and more meaningful than face-to-face communication in real time situation.
Performance Analysis for Major Chain Convenience Stores in Taiwan
Authors: Hsu Spring C.
Published: December 2017

Taiwan is one of the highest density market of convenience stores in the world, and most of the stores belong to certain major chain convenience store systems. Therefore, it is important to analyze the operating performance of these chain convenience stores. This study selects the four largest domestic chain convenience store systems in Taiwan, as 7-Eleven, FamilyMart, Hi-Life, and OK-Mart, for the operational efficiency and comparative analysis. Moreover, this study deploys the data envelopment analysis (DEA) efficiency measurement method for measuring efficiency of these chain convenience stores because of its proved effectiveness in many manufacturing and service operating efficiency analysis. The results of this study show that the operating performance of 7-Eleven is the most efficient due to the economy of scales. However, 7-Eleven should beware of the followed FamilyMart, which owns the 85% relative efficiency compared to 7-Eleven, and may catch up with 7-Eleven if it increases its number of stores.
AVALIAÇÃO DA ATIVIDADE CICATRIZANTE DE PREPARADOS À BASE DE JUCÁ (Caesalpinia ferrea Mart.)
Authors: Batista Emanuelle Karine Frota , Trindade Hebelys Ibiapina da , Farias Ingrid Dos Santos , Martins Fernanda Maria Madeira , Silva Filho Osmar Ferreira da , Batista Maria Do Carmo de Souza
Published: December 2017

A Cesalpinia ferrea, conhecida popularmente como jucá, possui diversas atividades farmacológicas comprovadas. Na região nordeste do Brasil esta planta é frequentemente usado no tratamento de feridas cutâneas, apresentando bons resultados, o que desperta grande interesse nos estudos biotecnológicos e farmacológicos dessa espécie. O objetivo desse estudo foi avaliar a atividade cicatrizante da vagem de jucá (C. ferrea) isolada ou em associação com o açúcar, na cicatrização de feridas cutâneas de coelhos. Foram utilizados 40 coelhos (Oryctalagus cunicullus) adultos, divididos em cinco grupos: controle, pó das vagens in natura, pó das vagens in natura acrescido de açúcar (1:1), jucá em pomada com veículo glicerinado, e jucá acrescido de açúcar em pomada com veículo glicerinado, administrados três vezes ao dia. Após anestesia dissociativa foi realizada a confecção cirúrgica de feridas padronizadas, na dimensão de 2,5 cm2. Foram realizadas avaliações clínicas diárias, análises macroscópicas e histopatológicas das lesões nos dias três e dez após a confecção cirúrgica das feridas. Os resultados revelaram que não houve diferença significativa entre os grupos com relação ao tempo de cicatrização, porém o tratamento tópico com pomada formulada com o pó oriunda da vagem de jucá promoveu um aumento significativo da contração da área da lesão no terceiro e décimo dia.
DIÂMETRO FOLICULAR E FERTILIDADE DE VACAS MESTIÇAS LEITEIRAS SUBMETIDAS A PROTOCOLO DE IATF COM AJUSTES NO PROESTRO
Authors: Rodrigues Alexandra Soares , Silva Mariana Alves Andrade , Brandão Tiago Oliveira , Bittencourt Rodrigo Freitas , Chalhoub Marcos , Ribeiro Filho Antonio De Lisboa
Published: December 2017

Objetivou-se comparar protocolos de sincronização com uma e duas aplicações de um luteolítico simultâneas ou não a gonadotrofina coriônica equina (eCG) sobre o diâmetro do folículo ovulatório (DFOL) e a taxa de concepção de fêmeas mestiças leiteiras cíclicas. Para tanto, no D0 foi iniciado o protocolo por meio da inserção de dispositivo de progesterona (P4) e aplicação de 2,0mg de benzoato de estradiol. No D7 receberam 12,5mg de dinoprost trometamina. No D9 executou-se remoção dos P4 e aplicou-se 0,6mg de cipionato de estradiol. Nesse momento, as fêmeas foram subdivididas nos seguintes tratamentos: Grupo Controle - 2,5mL de solução fisiológica, Grupo 2PGF - 12,5mg de dinoprost trometamina, Grupo eCG - 300UI de eCG, Grupo 2PGF+eCG - 300UI de eCG e 12,5mg de dinoprost trometamina. No D11 foi realizada ultrassonografia transretal (US) para determinar o DFOL e os animais foram inseminados. O diagnóstico de gestação foi realizado por US 55 dias após. Os dados obtidos foram avaliados pelo SPSS considerando P≤0,05. O DFOL e as taxas de concepção foram semelhantes entre os protocolos de sincronização. Conclui-se que em animais cíclicos a utilização de protocolos com uma única dose PGF2α e sem suporte gonadotrófico do eCG parece proporcionar adequada resposta folicular e índices de fertilidade satisfatórios.
ESTIMATIVA DA ALTURA E DO VOLUME EM POVOAMENTOS JOVENS DE RESTAURAÇÃO FLORESTAL EM RONDÔNIA
Authors: Sanquetta Carlos Roberto , Sanquetta Mateus Niroh Inoue , Bastos Alexis , Queiroz Alexandre , Dalla Corte Ana Paula
Published: December 2017

Modelos hipsométricos e volumétricos são ferramentas úteis para monitorar o desenvolvimento de plantios de restauração florestal. O objetivo deste trabalho foi desenvolver equações hipsométricas e volumétricas para povoamentos jovens de restauração florestal em Rondônia. Neste estudo, foram ajustadas equações de estimativa de altura total (ht) e volume total com casca (v) em função do diâmetro à altura do peito. Os dados foram coletados em 20 árvores mensuradas e cubadas em povoamentos mistos jovens de restauração, situados nos municípios de Itapuã do Oeste e Cujubim, ao norte do estado de Rondônia, e cinco modelos de regressão hipsométricos e volumétricos foram testados. Além disso, foi analisada a utilização de um fator de forma médio nas estimativas de volume. Os modelos foram julgados pelo coeficiente de determinação (R²), erro padrão da estimativa em percentagem (Syx%) e análise gráfica dos resíduos. Todos os modelos hipsométricos apresentaram resultados satisfatórios, com Syx de 15% e R² variando entre 0,5443-0,5946, sendo o modelo de Henriksen selecionado como o melhor. Os modelos volumétricos apresentaram valores Syx da ordem de 11% e R² variando entre 0,8497-0,9117, em que o melhor modelo volumétrico foi o de Kopezky & Gehrardt. Observou-se que existe forte correlação entre as variáveis dendrométricas analisadas (entre 0,7573 e 0,9531), bem como, que o fator de forma não foi preciso para estimar volume. Adicionalmente, conclui-se que os modelos de regressão, tanto hipsométricos como volumétricos, são precisos e podem gerar estimativas confiáveis para o monitoramento de povoamentos jovens de restauração florestal na Amazônia.
MANUTENÇÃO PREVENTIVA COMO DETERMINANTE PARA REDUÇÃO DE CUSTOS DE MANUTENÇÃO DE UM FELLER BUNCHER
Authors: Diniz Carlos Cezar Cavassin , Lopes Eduardo Da Silva , Miranda Gabriel De Magalhães , Koehler Henrique Soares
Published: December 2017

Este trabalho avaliou a atividade de manutenção mecânica de um feller buncher empregando a World Class Maintenance (WCM), que utiliza como premissa a manutenção preventiva, visando a redução dos custos de produção e melhor aproveitamento dos recursos disponíveis. O trabalho foi conduzido em plantios de Pinus taeda e Eucalyptus grandis de uma empresa florestal localizada no estado do Paraná, Brasil. A análise contemplou três períodos subsequentes de seis meses, sendo eles: implantação, amadurecimento e estabilização do modelo WCM. A avaliação foi realizada por meio da determinação dos índices de disponibilidade mecânica, consumo de óleo hidráulico e custos da manutenção. Os resultados mostraram que houve aumento na disponibilidade mecânica do equipamento de 1,75%. Para o consumo de óleo hidráulico, após o período de implantação, houve redução de 63%, reflexo este das manutenções preventivas realizadas durante as atividades.  O custo de manutenção no modelo WCM apresentou redução de 14,4%, ocasionado pelo investimento de infraestrutura e treinamento de mecânicos e operadores. O modelo o WCM mostrou aplicabilidade na manutenção de equipamentos de corte florestal, com potencial de melhorias em relação à segurança operacional, capacidade produtiva e aumento da vida útil dos mesmos.
PERCOLADO DE NITRATO EM CAMBISSOLO ADUBADO COM DIFERENTES DOSES DE BIOSSÓLIDO
Authors: Steffler Marcelo , Steffler Venicio , Gueri Matheus Vitor Diniz , Martins Kelly Geronazzo
Published: December 2017

Uma das preocupações com o uso de lodo de esgoto no solo agrícola refere-se ao risco de poluição das águas subterrâneas causada pela lixiviação de nitrato, o que torna necessário mais pesquisas a esse respeito. Nesse contexto, o presente estudo objetivou avaliar o comportamento de três diferentes doses de biossólido oriundo da estação de tratamento de esgoto do Rio das Antas de Irati, Paraná. Foram misturados biossólido com Cambissolo nas dosagens de 2,5; 5,0; e 7,5%; em seguida, as amostras foram inseridas em colunas de PVC com o fundo vazado, que permitiram a captação da água percolada para realização das análises de nitrato.  Os resultados comprovaram que doses de até 25 t.ha-1 não implicam em aumento significativo de nitrato no percolado, porém doses superiores a 80 t.ha-1 não devem ser aplicadas, pois, segundo o modelo de regressão encontrado, essa aplicação resultaria em doses nocivas de nitrato nas águas subterrâneas. Recomenda-se que em estudos futuros aspectos referentes à capacidade de troca catiônica e o teor de nitrogênio no solo sejam correlacionados com a concentração de nitrato percolado, uma vez que podem afetar significativamente o comportamento do íon no horizonte do solo.
POTENCIAL DENDROENERGÉTICO DOS DIFERENTES COMPARTIMENTOS DE Acacia mearnsii CULTIVADA NO ESTADO DO RIO GRANDE DO SUL
Authors: Da Silva Dimas Agostinho , Behling Alexandre , Sanquetta Carlos Roberto , Dalla Corte Ana Paula , Ruza Marieli Sabrina , Pscheidt Heloisa , Costa Junior Sergio
Published: December 2017

A utilização da biomassa para conversão em energia tem sido um tema muito abordado na atualidade, devido a importância da geração de energia limpa e renovável. Este estudo teve como objetivo analisar o potencial dendroenergético dos compartimentos da Acacia mearnsii De Wild. sob diferentes idades. Para isso, foi conduzido um estudo em dois povoamentos da espécie no estado do Rio Grande do Sul com idades de 1 a 7 anos. A biomassa foi mensurada por compartimento nas diferentes idades e, após esse processo, foi determinado o poder calorífico superior (PCS) das amostras. O cálculo da produtividade energética foi realizado pela multiplicação das variáveis biomassa e PCS. Mediante a análise de variância, evidenciou-se que existem diferenças significativas para o PCS dos compartimentos avaliados, tendo PCS médio para as folhas, a casca, os galhos vivos e a madeira, de 5.408, 4.787, 4.692 e 4.572 kcal kg-1, respectivamente. A produtividade energética da biomassa aumentou com o incremento da idade, com valores variando de 16,3 Gcal ha-1 para o plantio de um ano a 635 Gcal ha-1 para o povoamento de sete anos, sendo a madeira, o componente de maior contribuição para esses valores, exceto na primeira idade. Conclui-se que a espécie tem potencial para suprir futuras demandas energéticas e que a produtividade energética varia conforme a idade e o compartimento.
INFECÇÃO DE SÍTIO CIRÚRGICO PÓS-ALTA: OCORRÊNCIA E CARACTERIZAÇÃO DE EGRESSOS DE CIRURGIA GERAL
Authors: Dos Reis Raíssa Gabriela , Rodrigues Maria Cristina Soares
Published: December 2017

Objetivou-se investigar a ocorrência de infecção de sítio cirúrgico e descrever as características dos casos de pacientes em seguimento pós-alta de Cirurgia Geral, em ambulatório de hospital do Distrito Federal, Brasil. Estudo descritivo, retrospectivo dos anos 2011 a 2013, realizado de agosto de 2015 a julho de 2016, a partir de consulta a sistemas de informações do hospital e prontuários de pacientes. No período do estudo, foram realizados 2.772 procedimentos na especialidade Cirurgia Geral e 2.283 (82,28%) pacientes compareceram ao acompanhamento pós-alta. Foram diagnosticados 85 casos de infecção, uma incidência média de 3,7% no período. Verificou-se maior ocorrência de casos de infecção entre o 6º e 10º dia pós-operatório. Os dados reforçam a relevância da vigilância pós-alta instituída no serviço de saúde e mostram indicadores de resultado que podem auxiliar na definição de estratégias para melhoria de ações de prevenção e controle de infecções de sítio cirúrgico.
COMPLICAÇÕES EM PACIENTES RENAIS CRÔNICOS SUBMETIDOS À HEMODIÁLISE
Authors: Tinôco Jéssica Dantas de Sá , De Paiva Maria das Graças Mariano Nunes , Lúcio Kadyjina Daiane Batista , Pinheiro Raissa Lopes , De Macedo Beatriz Medeiros , Lira Ana Luisa Brandão de Carvalho
Published: December 2017

Objetivou identificar as complicações em pacientes renais crônicos submetidos à hemodiálise e correlacioná-las aos fatores sociodemográficos e clínicos. Estudo transversal, com 200 pacientes em uma clínica de nefrologia no Nordeste do Brasil. Utilizou-se um formulário para a coleta de dados, que ocorreu durante março e abril de 2015. Na análise inferencial, foram aplicados testes de Qui-Quadrado e Exato de Fisher, e U de Mann-Whitney, na associação entre variáveis nominais e numéricas. As associações estatísticas foram: hipotensão com idade, sexo e ganho de peso interdialítico; calafrios com sexo e ganho de peso interdialítico; vômito com sexo, sítio de diálise e KT/V; cefaleia com sexo e idade; tontura com anos de estudo, religião e ganho de peso interdialítico; arritmia e idade; diarreia e tempo de hemodiálise; dor abdominal e ganho de peso interdialítico; sudorese e idade. Conclui-se que complicações durante a hemodiálise podem sofrer influência de fatores sociodemográficos e clínicos.
Turismo religioso e cultural na Amazônia: a turistificação do espaço no Círio de Nazaré em Belém (Pará-PA, Brasil)
Authors: Serra Débora Rodrigues de Oliveira
Published: December 2017

No presente artigo se aborda o Círio de Nazaré em Belém (Pará–PA, Brasil), uma das metrópoles da região amazônica, buscando sua relação com as práticas turísticas encontradas nesse complexo de eventos. A pesquisa se deu entre os anos de 2012 a 2014, complementando-se com a atualização de dados oficiais em 2015. A metodologia utilizada constituiu-se de levantamento bibliográfico acerca da festividade do Círio de Nazaré, do espaço geográfico e sua apropriação para o turismo, e dos segmentos do turismo religioso e cultural. No estudo, se pretendeu demonstrar as implicações espaciais da atividade turística e a diversidade de expectativas de cada grupo de agentes promotores dos processos de turistificação de espaços relacionados à fé católica, enfatizando-se o Círio de Nazaré. Dentre as implicações espaciais observadas, destacam-se as intervenções permanentes realizadas no entorno da Basílica de Nazaré e as alterações temporárias, que se dão durante a realização da festividade, a exemplo da instalação de arquibancadas e da realização eventos paralelos, ambas visando à ampliação da sua atratividade turística.
The professional journey of Saudi nurse graduates: A lived experience
Authors: Alboliteeh Mohammad , Magarey Judy , Wiechula Richard
Published: December 2017

Objective: To illuminate the lived experience of Saudi Nurse graduates during their early years in the workplace as professional nurses encompassing their experiences from being nurse students, preparations to become registered nurses, their struggles from being a student to a professional nurse, their cultural competence towards colleagues and patients in their new workplace, their impression of Nursing as a profession and other challenges they faced in especially on language and communication with their patients and colleagues.Methods: An interpretive phenomenological inquiry was utilized to inquire and discover the lived experiences of Saudi Nurse graduates to their job as nurses in different hospitals in Riyadh, Saudi Arabia. A total of 12 nurses were interviewed for this study in the course of 5 months. The interviews conducted with the 12 nurses were audiotaped recorded and subsequently transcribed in verbatim form and the Collaizi Method was used for the extraction of meanings from the interviews.Results: Five major themes were identified in the transcribed form of the interview and 11 subthemes emerged as well. The five major themes were educational preparation, transition into practice, cultural competence, image of nursing and language and communication.Conclusions: The study described the different challenges faced by Saudi nurse graduates from being students to professionals based from their experiences as newly employed staff nurses in different hospitals in Saudi Arabia. Their stories captured the story of novice nurses not only as a Saudi but may be true for other nationalities. These stories are shared by all nurses across the world who struggle to meet the demands of the nursing profession.
Het gebruik van Big Data voor opsporingsdoeleinden: tussen Strafvordering en Wet politiegegevens
Authors: Schermer B. W.
Published: December 2017

Het gebruik van Big Data voor opsporingsdoeleinden: tussen Strafvordering en Wet politiegegevens

Het gebruik van grote hoeveelheden gegevens (Big Data) levert een steeds grotere bijdrage aan het succes van de opsporing. De toepassing van Big Data brengt echter ook (privacy)risico’s met zich mee. Door de gebrekkige samenhang tussen het Wetboek van Strafvordering en de Wet politiegegevens is het gebruik van Big Data momenteel niet goed gereguleerd. In dit artikel worden de belangrijkste risico’s voor de rechtsbescherming bij het gebruik van Big Data voor opsporingsdoeleinden besproken en wordt bekeken in hoeverre het huidige en toekomstige strafvorderlijke kader deze risico’s kan adresseren.
De rol van alternatieve handhaving in het mededingingstoezicht
Authors: Lachnit Eva
Published: December 2017

De rol van alternatieve handhaving in het mededingingstoezicht

In deze bijdrage worden enkele alternatieve handhavingsinstrumenten geanalyseerd zoals zij gebruikt worden door de Nederlandse Autoriteit Consument en Markt (ACM), de Britse Competition and Markets Authority (CMA) en de Franse Autorité de la Concurrence (de Autorité). Echter, hierbij ligt de focus niet op de individuele, juridische analyse van ieder handhavingsinstrument, maar op de relatie tussen handhavingsinstrumenten, onderliggende strategie, en toezichthouder. Het uiteindelijke doel van deze bijdrage is om te illustreren wat de gevolgen kunnen zijn van een brede toepassing van alternatieve handhavingsinstrumenten vanuit het perspectief van toezicht. Hierbij zullen er, met name in de concluderende paragrafen, conclusies worden getrokken die bruikbaar zijn voor het toepassen van alternatieve handhaving buiten het mededingingstoezicht.
Het effect van internationale netwerken en agentschappen in nationale implementatie van Europees beleid
Authors: Versluis Esther , Polak Josine
Published: December 2017

Het effect van internationale netwerken en agentschappen in nationale implementatie van Europees beleid

Dit artikel analyseert de betrokkenheid van internationale netwerken en agentschappen bij de implementatie van Europese regelgeving op nationaal niveau. Aan de hand van een synthese van eerder onderzoek concluderen wij dat dit soort internationale samenwerking alleen succesvol is als er sprake is van wederzijdse afhankelijkheid tussen landen, en er een informele samenwerkingscultuur heerst. Omdat oorzaken van implementatieproblematiek nooit hetzelfde zullen zijn in alle EU-lidstaten, doen Europese netwerken en agentschappen er verstandig aan niet te gedetailleerd te willen sturen, maar rekening te blijven houden met het belang van culturele verschillen tussen de verschillende lidstaten van de EU.
Doelverschuiving binnen toezichthoudende organisaties: typologie en optreden
Authors: Huizinga Kees , De Bree Martin
Published: December 2017

Doelverschuiving binnen toezichthoudende organisaties: typologie en optreden

In dit conceptuele artikel wordt doelverschuiving binnen toezichthoudende organisaties verkend. Onderscheid wordt gemaakt in drie types doelverschuiving, te weten doelverplaatsing, doelversmalling en doelverbreding. Indicaties voor het optreden van elk van deze types binnen toezichthoudende organisaties worden beschreven. Geconcludeerd wordt dat doelverschuiving de doeltreffendheid van toezicht ongemerkt aanzienlijk negatief kan beïnvloeden.
Aquecimento não modifica o volume durante o treinamento com pesos
Authors: Pina Fábio Luiz Cheche , Cavalcante Edilaine Fungari , Okamura Fernando Hiroyuki , Belasque Vinicius Geraldes , Pina Thelma Willamowius , Cyrino Edilson Serpeloni
Published: December 2017

Objetivo: Analisar a influncia de diferentes formas de aquecimento sobre o volume de treino em homens treinados. Mtodos: Quatro sesses experimentais foram realizadas: aquecimento especfico (ESP), aquecimento aerbio (AE), aquecimento alongamento (ALO) e sesso controle (CO) pr sesso de treinamento com pesos. O programa de treino foi estruturado com seis exerccios, executados em trs sries de oito a doze repeties. Informaes referentes ao volume de treino, durao da sesso e nmero de repeties foram coletadas. Resultados: Efeito (P 0,01) para a durao do treino foi observado, apresentando o CO (42,6 2,0 min.) menor durao de treinamento quando comparado as sesses ALO (62,3 3,0 min.), ESP (51,5 4,0 min.) e AE (52,7 1,0 min.). No foram observados efeitos do aquecimento (P 0,05) com relao ao volume de treino. Concluso: Os resultados demonstram que o aquecimento no apresenta melhora no volume de treino.
Towards 5G – C Loud-Based Radio Access Networks
Authors: Gajewski Sławomir
Published: December 2017

In the paper a general concept of the 5G network architecture is presented as well as system requirements having impact on innovative solutions in the 5G network are highlighted. A major part of the paper is both presentation and discussion of the problem of Cloud Radio Access Network introduction for public networks in which the cell and resource virtualisation will be implemented. On the other hand, the problem of resource virtualization in the STRUGA system is discussed in which the C-RAN implementation is proposed for performance improvement.
Polish Experience in Developing and Employing Unmanned Surface Vehicles At Sea
Authors: Kitowski Zygmunt
Published: December 2017

This article is based on an analysis of missions carried out by unmanned surface vehicles (USVs). It discusses measures taken in Poland to develop such vehicles, designed to provide support to operations conducted by the country’s maritime services, security and monitoring of seaports and critical objects. It summarizes the results of research and development efforts and presents a new approach to employing these vehicles throughout the world.