bluuebunny/crossref_metadata_2025 huggingface dataset:
A maximal restriction theorem and Lebesgue points of functions in $\mathcal F(L^p)$
Authors: Müller Detlef , Ricci Fulvio , Wright James
Published: April 2019

Fourier restriction theorems, whose study had been initiated by E.M. Stein, usually describe a family of a priori estimates of the

L^q

-norm of the restriction of the Fourier transform of a function

f

in

L^p(\mathbb R^n)

to a given subvariety

S

, endowed with a suitable measure. Such estimates allow to define the restriction

\mathcal{R} f

of the Fourier transform of an

L^p

-function to

S

in an operator theoretic sense. In this article, we begin to investigate the question what is the „intrinsic" pointwise relation between

\mathcal{R} f

and the Fourier transform of

f

, by looking at curves in the plane, for instance with non-vanishing curvature. To this end, we bound suitable maximal operators, including the Hardy–Littlewood maximal function of the Fourier transform of

f

restricted to

S

.
О количествах ребер в порожденных подграфах
некоторых дистанционных графов
Authors: Pushnyakov Philipp Anatolevich
Published: April 2019

В работе получены новые оценки числа ребер
в порожденных подграфах некоторого дистанционного графа.
Библиография: 33 названия.
О кривизне кэлеровых многообразий с нулевым тензором Риччи
Authors: Kokarev Victor Nikolaevich
Published: April 2019

В работе исследуется поведение модуля тензора кривизны и
голоморфной секционной кривизны
на Риччи-плоских кэлеровых многообразиях.
Библиография: 11 названий.
Разрешимость операторного уравнения Риккати в фешбаховском случае
Authors: Albeverio Sergio A , Motovilov Alexander Konstantinovich
Published: April 2019

Пусть $L$ - ограниченная блочно-операторная $(2\times2)$-матрица,
блок-компоненты которой на главной диагонали являются
самосопряженными операторами. Предполагается, что спектр одной из
этих блок-компонент является абсолютно непрерывным и представлен
единственной конечной зоной, а спектр другой такой блок-компоненты
целиком лежит в этой зоне. Устанавливаются условия, при которых
операторная матрица $L$ допускает комплексную деформацию,
а операторные уравнения, ассоциированные с продеформированной $L$,
обладают ограниченными решениями. Эти условия также гарантируют
факторизацию типа Маркуса-Мацаева для одного из исходных дополнений
Шура после его аналитического продолжения на нефизические листы
комплексной плоскости спектрального параметра. Дается доказательство
того, что операторные корни этого дополнения Шура выражаются через
соответствующие решения деформированных уравнений Риккати.
Библиография: 38 названий.
Об одном критерии унитарности парциальной $S$-матрицы резонансного рассеяния
Authors: Khangulyan Vladimir Andronikovich
Published: April 2019

Рассматривается влияние $N$ долгоживущих состояний, характеризующихся резонансными энергиями $E_i$ и ширинами $\Gamma_i(E)$, на процесс упругого рассеяния. Получено выражение для парциальной $S$-матрицы $S_l(E) $ в виде суммы по резонансным уровням (полюсам), вычеты в которых имеют вид $\Gamma_i\prod_{ \substack{k=1,k\neq i}}^N\gamma_{ik}$, где $\gamma_{ik}={(z_i-z_k^*)}/{(z_i-z_k )} $, а $z_i=E_i-{\imath\Gamma_i }/{2} $. Показано, что необходимое условие унитарности парциальной $S$-матрицы при наличии $N$ резонансных уровней записывается как $\sum_{i=1}^N\Gamma_i(E)\prod_{\substack{k=1,k\neq i}}^N\gamma_{ik}=\sum_{i=1}^N\Gamma_i(E)$.
О периодических мерах Гиббса для модели Поттса-SOS на дереве Кэли
Authors: Rasulova Mukhayo Akbarzhon kizi
Published: April 2019

Дано описание периодических мер Гиббса для модели Поттса-SOS на дереве Кэли порядка $k\ge 1$, а именно определены такие меры относительно любой нормальной подгруппы конечного индекса в групповом представлении дерева Кэли.
Вещественные формы эллиптических интегрируемых систем
Authors: Grekov Andrei Mikhailovich , Dotsenko Egor Ivanovich
Published: April 2019

В рамках общей схемы построения вещественных редукций систем Хитчина описаны вещественные формы таких классических эллиптических интегрируемых систем, как эллиптическая система Калоджеро-Мозера и эллиптический волчок Эйлера-Арнольда.
Существенно непертурбативные эффекты поляризации вакуума в двумерной системе Дирака-Кулона при $Z>Z_{\mathrm{cr}}$. Энергия поляризации вакуума
Authors: Sveshnikov Konstantin Alekseevich , Voronina Yuliya Sergeevna , Davydov Andrei Semenovich , Grashin Petr Anatol'evich
Published: April 2019

Для планарной системы Дирака-Кулона со сверхкритическим протяженным аксиально-симметричным кулоновским источником с зарядом $Z>Z_{\mathrm{cr},1}$ и радиусом $R_0$ рассмотрены существенно непертурбативные эффекты поляризации вакуума в закритической области. На основе результатов, полученных в предыдущей работе авторов для индуцированной плотности заряда $\rho_{\scriptscriptstyle\mathrm{VP}}(\vec r )$, подробно рассматривается расчет вакуумной энергии $\mathcal E_{\scriptscriptstyle\mathrm{VP}}$, основанный на перенормировке, сходимости парциального разложения для $\rho_{\scriptscriptstyle\mathrm{VP}}(\vec r )$ и поведении интегрального наведенного заряда $Q_{\scriptscriptstyle\mathrm{VP}}$ в закритической области. В частности, показано, что перенормировка через фермионную петлю с двумя внешними линиями оказывается универсальным приемом, который устраняет расходимость теории как в чисто пертурбативном, так и в существенно непертурбативном режимах как для $\rho_{\scriptscriptstyle\mathrm{VP}}(\vec r )$, так и для $\mathcal E_{\scriptscriptstyle\mathrm{VP}}$. Наиболее значимый результат состоит в том, что в такой системе при $Z\gg Z_{\mathrm{cr},1}$ вакуумная энергия становится быстро убывающей функцией заряда источника $Z$, достигающей больших отрицательных значений, поведение которой оценивается снизу (по модулю) как $\sim-|\eta_{\mathrm{eff}}Z^3|/R_0$. Исследована также зависимость эффекта убывания $\mathcal E_{\scriptscriptstyle\mathrm{VP}}$ от обрезания кулоновской асимптотики внешнего поля на различных масштабах $R_1>R_0$ и $R_1\gg R_0$.
Qualidade de sementes de Bauhinia variegata tratadas com óleos essenciais
Authors: Gomes Rommel Dos Santos Siqueira , Farias Otília Ricardo , Duarte Ingrid Gomes , Silva Rafael Tavares da , Cruz José Manoel Ferreira Lima , Nascimento Luciana Cordeiro do
Published: April 2019

Esse trabalho teve por objetivo verificar o efeito de óleos essenciais no controle de patógenos e na qualidade fisiológica de sementes de Bauhinia variegata. Os tratamentos utilizados foram os óleos essenciais de Carapa guianensis Aubl., Cinnamomum zeylanicum Breyn. e Ocimum basilicum L. nas concentrações de 1.000, 1.500 e 2.000 μL, fungicida captana (240 g 100-1 kg-1 de sementes) e como controle apenas água destilada e esterilizada, em delineamento experimental inteiramente casualizado com quatro repetições de 50 sementes. Foi verificado efeito satisfatório na qualidade sanitária e fisiológica das sementes de B. variegata, tratadas com óleo esssencial de C. zeylanicum e O. basilicum.
Produção e desempenho de carvão ativado fisicamente a partir de Bambusa vulgaris
Authors: Morais Rayssa De Medeiros , Santana Gregório Mateus , Costa Lelis Roberto Carlos , Paes Juarez Benigno , Schueler Maria Vanessa Egger , Morbeck Fernanda Lago
Published: April 2019

Foi produzido carvão ativado (CA) a partir de Bambusa vulgaris para avaliar seu potencial para adsorção do corante azul de metileno (AM). O CA foi preparado mediante ativação física direta, utilizando como agente ativante o vapor d’água sendo caracterizado quanto ao rendimento gravimétrico em CA, pH do ponto de carga zero, método titulométrico de Boehm, análise de área superficial, volume e diâmetro dos poros e da morfologia superficial. Para aplicação do CA realizou-se estudos de cinética e isotermas de adsorção, tendo aplicados modelos de isotermas de Langmuir e Freundlich. O material produzido apresentou área superficial de 684,69 m2 g-1, pH do ponto de carga zero de 7,32 e predominância de grupos ácidos em sua superfície. Pela análise da micrografia foi possível verificar o desenvolvimento da porosidade do material devido à ativação. A capacidade máxima de adsorção para o corante AM foi de 301,07 mg g-1 com melhor ajuste ao modelo de Langmuir. O CA obtido a partir de Bambusa vulgaris apresentou excelentes propriedades texturais e adsortivas, sendo eficiente na adsorção do corante azul de metileno.
A abordagem da competição esportiva na escola: uma pesquisa-ação com professores de Educação Física
Authors: Gonçalves Valéria , González Fernando Jaime , Borges Robson Machado
Published: April 2019

O esporte e a competição são assuntos completamente interligados e que estão presentes na sociedade de diferentes formas. Contudo, professores de Educação Física (EF) escolar têm dificuldades em contextualizar a competição em suas aulas, muitas vezes por desconhecerem propostas que abordam o assunto de forma significativa para eles. Nesse contexto, esta investigação tem como objetivo principal descrever as decorrências de uma pesquisa-ação com docentes de EF, acerca do tratamento da competição esportiva na escola. Em oito encontros, um dos pesquisadores e duas professoras se reuniram para estudar a aplicação do Sport Education. Os resultados apontam uma mudança na concepção das docentes sobre a contextualização da competição esportiva nas aulas de EF, uma vez que elas compreenderam a possibilidade de se trabalhar com essa temática a partir dos princípios do Sport Education.
O lúdico em contexto de saúde: inter-relações com as práticas humanizadas
Authors: Bataglion Giandra Anceski , Marinho Alcyane
Published: April 2019

O objetivo desta pesquisa foi analisar as concepções e as formas de utilização do lúdico por profissionais, que atuam na reabilitação de crianças com deficiência, em uma instituição de saúde estadual de Santa Catarina. A pesquisa configura-se como uma investigação de campo, descritiva e exploratória, com abordagem qualitativa dos dados. Para a coleta de dados foi utilizado um roteiro de entrevista semiestruturada e observações sistemáticas. A análise de dados ocorreu por meio da técnica “análise de conteúdo”. As profissionais demonstraram visões semelhantes sobre o lúdico reconhecendo-o nos jogos e nas brincadeiras que propiciam prazer e diversão, porém, desconsideraram outras possibilidades de sua fruição, fato que, aparentemente, não influencia na utilização deste elemento no contexto investigado. Isto porque o atendimento humanizado é refletido na manifestação de elementos lúdicos geradores de benefícios em todos os aspectos da vida da criança.
GP Brasil de Fórmula 1: um megaevento esportivo e sua relação com a cidade de São Paulo
Authors: Varotti Felipe De Pilla , Nassif Vânia Maria Jorge
Published: April 2019

A temática sobre os megaeventos esportivos ganhou ampla discussão no cenário político e esportivo nacional na última década. Megaeventos esportivos atraem grande número de visitantes e promovem a venda de grande quantidade de ingressos; possuem relevância e cobertura de mídia internacionais; exigem um grande investimento por parte dos organizadores, representados por entidades governamentais em conjunto com entidades não governamentais; geram significativa atividade econômica para as cidades sedes. Por meio de uma pesquisa qualitativa, descritiva e exploratória, foram analisadas essas características e chegou-se a conclusão que o GP Brasil é classificado como um megaevento esportivo. Este estudo demonstra também que sediar um megaevento esportivo deve fazer parte de um planejamento eficiente visando reais benefícios para a população das cidades sedes. Um evento que ocorra de maneira consecutiva, por vários anos, em um mesmo local, reúne maiores condições de gerar uma identificação com sua cidade sede, facilitando o desenvolvimento desses possíveis benefícios.
Local government and community events in New Zealand: a case study of two neighbouring cities
Authors: Grima Joany
Published: April 2019

The objectives for this research project were to examine the quality and type of support offered to community events through a case study of two neighbouring councils in the North Island of New Zealand; and to determine the impacts of events staged in the communities of both councils, including their influence on social capital building.

The study found that both councils are supportive of the delivery of events by both council and non-council event organisers. The councils are providing human, financial and physical capital to enable the output of events. Event impacts – specifically social and economic impacts – were considered to be positive in nature.

However, there is scope for greater strategic planning around community event delivery both by individual authorities and collaboratively, including the establishment of formal monitoring and evaluation systems. There is also scope to incorporate key lessons in regard to good practice, as identified by this study.
Characterisation of short-term extreme methane fluxes related to non-turbulent mixing above an Arctic permafrost ecosystem
Authors: Schaller Carsten , Kittler Fanny , Foken Thomas , Göckede Mathias
Published: April 2019

Abstract. Methane (CH4) emissions from biogenic sources,
such as Arctic permafrost wetlands, are associated with large uncertainties
because of the high variability of fluxes in both space and time. This
variability poses a challenge to monitoring CH4 fluxes with the eddy
covariance (EC) technique, because this approach requires stationary signals
from spatially homogeneous sources. Episodic outbursts of CH4
emissions, i.e. triggered by spontaneous outgassing of bubbles or venting of
methane-rich air from lower levels due to shifts in atmospheric conditions,
are particularly challenging to quantify. Such events typically last for only
a few minutes, which is much shorter than the common averaging interval for
EC (30 min). The steady-state assumption is jeopardised, which potentially
leads to a non-negligible bias in the CH4 flux. Based on data from
Chersky, NE Siberia, we tested and evaluated a flux calculation method based
on wavelet analysis, which, in contrast to regular EC data processing, does
not require steady-state conditions and is allowed to obtain fluxes over
averaging periods as short as 1 min. Statistics on meteorological conditions
before, during, and after the detected events revealed that it is atmospheric
mixing that triggered such events rather than CH4 emission from the
soil. By investigating individual events in more detail, we identified a
potential influence of various mesoscale processes like gravity waves,
low-level jets, weather fronts passing the site, and cold-air advection from
a nearby mountain ridge as the dominating processes. The occurrence of
extreme CH4 flux events over the summer season followed a seasonal
course with a maximum in early August, which is strongly correlated with the
maximum soil temperature. Overall, our findings demonstrate that wavelet
analysis is a powerful method for resolving highly variable flux events on
the order of minutes, and can therefore support the evaluation of EC flux
data quality under non-steady-state conditions.
Secondary organic aerosol formation from α-pinene, alkanes and oil sands related precursors in a new oxidation flow reactor
Authors: Li Kun , Liggio John , Lee Patrick , Han Chong , Liu Qifan , Li Shao-Meng
Published: April 2019

Abstract. Oil sands (OS) operations in Alberta, Canada are a large source of secondary organic aerosol (SOA). However, the SOA formation process from OS-related precursors remains poorly understood. In this work, a newly developed oxidation flow reactor (OFR), the Environment and Climate Change Canada OFR (ECCC-OFR), was characterized and used to study the yields and composition of SOA formed from OH oxidation of α-pinene, selected alkanes, and the vapors evolved from five OS-related samples (OS ore, naphtha, tailings pond water, bitumen, and dilbit). The derived SOA yields from α-pinene and selected alkanes using the ECCC-OFR were in good agreement with those of traditional smog chamber experiments, but significantly higher than those of other OFR studies under similar conditions. The results also suggest that gas-phase reactions leading to fragmentation (i.e., C-C bond cleavage) have a relatively small impact on the SOA yields in the ECCC-OFR at high photochemical ages, in contrast to other previously reported OFR results. Translating the impact of fragmentation reactions in the ECCC-OFR to ambient atmospheric conditions reduces its impact on SOA formation even further. These results highlight the importance of careful evaluation of OFR data, particularly when using such data to provide empirical factors for the fragmentation process in models. Application of the ECCC-OFR to OS-related precursor mixtures, demonstrated that the SOA yields from OS ore and bitumen vapors (maximum of ~ 0.6–0.7) are significantly higher than those from the vapors from solvent use (naphtha), effluent from OS processing (tailing pond water) and from the solvent diluted bitumen (dilbit) (maximum of ~ 0.2–0.3), likely due to the volatility of each precursor mixture. A comparison of the yields and elemental ratios (H / C and O / C) of the SOA from the OS-related precursors to those of linear and cyclic alkane precursors of similar carbon numbers suggests that cyclic alkanes play an important role in the SOA formation in the OS. The analysis further indicates that the majority of the SOA formed downwind of OS facilities is derived from open-pit mining operations (i.e., OS ore evaporative emissions), rather than from higher volatility precursors from solvent use during processing and/or tailing management. The current results have implications for improving the regional modeling of SOA from OS sources, for the potential mitigation of OS precursor emissions responsible for observed SOA downwind of OS operations, and for the understanding of petrochemical and alkane derived SOA in general.
Bio-optical characterization of subsurface chlorophyll maxima in the Mediterranean Sea from a Biogeochemical-Argo float database
Authors: Barbieux Marie , Uitz Julia , Gentili Bernard , Pasqueron de Fommervault Orens , Mignot Alexandre , Poteau Antoine , Schmechtig Catherine , Taillandier Vincent , Leymarie Edouard , Penkerc'h Christophe , D'Ortenzio Fabrizio , Claustre Hervé , Bricaud Annick
Published: April 2019

Abstract. As commonly observed in oligotrophic stratified waters, a subsurface (or
deep) chlorophyll maximum (SCM) frequently characterizes the vertical
distribution of phytoplankton chlorophyll in the Mediterranean Sea.
Occurring far from the surface layer “seen” by ocean colour satellites,
SCMs are difficult to observe with adequate spatio-temporal resolution and
their biogeochemical impact remains unknown. Biogeochemical-Argo (BGC-Argo)
profiling floats represent appropriate tools for studying the dynamics of
SCMs. Based on data collected from 36 BGC-Argo floats deployed in the
Mediterranean Sea, our study aims to address two main questions. (1) What
are the different types of SCMs in the Mediterranean Sea? (2) Which
environmental factors control their occurrence and dynamics? First, we
analysed the seasonal and regional variations in the chlorophyll
concentration (Chl a), particulate backscattering coefficient (bbp), a
proxy of the particulate organic carbon (POC) and environmental parameters
(photosynthetically active radiation and nitrates) within the SCM layer over the Mediterranean Basin. The
vertical profiles of Chl a and bbp were then statistically classified and the seasonal occurrence of each of the different types of SCMs
quantified. Finally, a case study was performed on two contrasted regions
and the environmental conditions at depth were further investigated to
understand the main controls on the SCMs. In the eastern basin, SCMs result,
at a first order, from a photoacclimation process. Conversely, SCMs in the
western basin reflect a biomass increase at depth benefiting from both light
and nitrate resources. Our results also suggest that a variety of
intermediate types of SCMs are encountered between these two endmember
situations.
Plant responses to volcanically elevated CO2 in two Costa Rican forests
Authors: Bogue Robert R. , Schwandner Florian M. , Fisher Joshua B. , Pavlick Ryan , Magney Troy S. , Famiglietti Caroline A. , Cawse-Nicholson Kerry , Yadav Vineet , Linick Justin P. , North Gretchen B. , Duarte Eliecer
Published: April 2019

Abstract. We explore the use of active volcanoes to determine the short- and
long-term effects of elevated CO2 on tropical trees. Active
volcanoes continuously but variably emit CO2 through diffuse
emissions on their flanks, exposing the overlying ecosystems to elevated
levels of atmospheric CO2. We found tight correlations
(r2=0.86 and r2=0.74) between wood stable carbon isotopic
composition and co-located volcanogenic CO2 emissions for two of
three investigated species (Oreopanax xalapensis and
Buddleja nitida), which documents the long-term photosynthetic
incorporation of isotopically heavy volcanogenic carbon into wood biomass.
Measurements of leaf fluorescence and chlorophyll concentration suggest that
volcanic CO2 also has measurable short-term functional impacts on
select species of tropical trees. Our findings indicate significant potential
for future studies to utilize ecosystems located on active volcanoes as
natural experiments to examine the ecological impacts of elevated atmospheric
CO2 in the tropics and elsewhere. Results also point the way toward
a possible future utilization of ecosystems exposed to volcanically elevated
CO2 to detect changes in deep volcanic degassing by using selected
species of trees as sensors.
Brief communication: PICOP, a new ocean melt parameterization under ice shelves combining PICO and a plume model
Authors: Pelle Tyler , Morlighem Mathieu , Bondzio Johannes H.
Published: April 2019

Abstract. Basal melting at the bottom of Antarctic ice shelves is a major control on
glacier dynamics, as it modulates the amount of buttressing that floating ice
shelves exert onto the ice streams feeding them. Three-dimensional ocean
circulation numerical models provide reliable estimates of basal melt rates
but remain too computationally expensive for century-scale projections. Ice
sheet modelers therefore routinely rely on simplified parameterizations based
on either ice shelf depth or more sophisticated box models. However, existing
parameterizations do not accurately resolve the complex spatial patterns of
sub-shelf melt rates that have been observed over Antarctica's ice shelves,
especially in the vicinity of the grounding line, where basal melting is one
of the primary drivers of grounding line migration. In this study, we couple
the Potsdam Ice-shelf Cavity mOdel (PICO, Reese et al., 2018) to a buoyant
plume melt rate parameterization (Lazeroms et al., 2018) to create PICOP, a
novel basal melt rate parameterization that is easy to implement in transient
ice sheet numerical models and produces a melt rate field that is in
excellent agreement with the spatial distribution and magnitude of
observations for several ocean basins. We test PICOP on the Amundsen Sea
sector of West Antarctica, Totten, and Moscow University ice shelves in East
Antarctica and the Filchner-Ronne Ice Shelf and compare the results to PICO.
We find that PICOP is able to reproduce inferred high melt rates beneath Pine
Island, Thwaites, and Totten glaciers (on the order of 100 m yr−1) and
removes the “banding” pattern observed in melt rates produced by PICO over
the Filchner-Ronne Ice Shelf. PICOP resolves many of the issues contemporary
basal melt rate parameterizations face and is therefore a valuable tool for
those looking to make future projections of Antarctic glaciers.
Diez años del Consejo de Defensa Sudamericano: arquitectura de seguridad internacional regional
Authors: Bragatti Milton Carlos
Published: April 2019

La Unión de Naciones Suramericanas (UNASUR) completó 10 años, en 2018, en crisis profunda: 6 países anunciaron la suspensión de la membresía en la institución. El propósito de este artículo es doble: hacer un resumen del desempeño del Consejo de Defensa de UNASUR en sus diez años de operación, su ascenso y “caída”; al hacerlo, busca resaltar los aspectos que revelan la competencia y la superposición del CDS con otros procesos de institucionalización de la defensa y la seguridad internacional en la región de América del Sur, que alcanzan un éxito relativo, al tiempo que son deficientes y se debilitan.
Hormonal Regulation of Fish Adaptation to Atypical Fluctuations in Temperature and Oxygen Regime of a Water Body
Authors: Potrokhov Oleksandr , Zinkovskyi Oleg , Prychepa Mykola , Khudiiash Yurii
Published: April 2019

Recently, the water temperature significantly exceeded the climatic norms for the studied region of Ukraine. Water is heated to 30ºC with a decrease in the concentration of dissolved oxygen in shallow water. In this connection, the change in the hormone content in the blood plasma of carp, roach, rudd, perch and ruff in response to these factors has been studied. Most of the fish species studied in June respond by increasing the cortisol content in the blood by 1.2–3.3 times to an increase in water temperature. Fish quite successfully adapts after a month's stay in conditions of high water temperature to 31ºC, and the level of cortisol is reduced. The content of thyroid hormones in the blood of the rudd, roach and ruff is quite high and after a month of adaptation to the existing factors. This indicates an increased activity in their metabolic processes. The content of somatotropin and prolactin in the blood of the studied fish species decreases 2.4–5.0 and 1.9–7.7 times, respectively, in response to an increase in temperature and a decrease in the oxygen concentration in water. This should lead to a decrease in the rate of fish growth and change in the activity of osmotic exchange. However, hormonal reactions are species-specific in nature to the existing factors. Perch and roach are less plastic to increase water temperature. Carp most favorably tolerates an increase in water temperature and a decrease in oxygen concentration.
World Christianity and the Ethnographic Imagination
Authors: Arrington Aminta
Published: April 2019

The ethnographic imagination links the big stories of broad historical forces and the small stories of individual lived experience. In the study of world Christianity, it links church movements with individual participants, texts with oral traditions, creeds with practices. In this article the author examines the role of migration in the Christian story of the Lisu of southwest China. The author tells the big story of how migration across borders greatly impacted the resilience of Lisu Christianity, allowing it to transcend the political turmoil of particular countries. But she also tells a small story, showing migration as a lived experience that greatly impacted one Christian family. The ethnographic imagination seeks truth in the frayed edges where big stories and small stories meet. Ultimately, the ethnographic imagination is an appropriate research posture for world Christianity because it requires that scholars approach the subject less as a corpus of texts and more as a community of souls.
The variational bi-complex formulation of Maxwell’s equations
Authors: Lopez-Monsalvo C.S. , Gutiérrez-Piñeres A.C.
Published: April 2019

In this manuscript, we present the variational derivation of Maxwell’s equations by means of the variational bi-complex. We use this exercise to introduce the reader to the formulation of geometric variational problems and their implementation in a Computer Algebra System.
All roads lead to the Dirac quantization condition
Authors: Aguilar Pedro
Published: April 2019

The existence of magnetic monopoles is a sufficient argument to explain the quantization of electric charge, an argument that was presented by Dirac. Regardless of the status of any search for magnetic monopoles, the formal description of the quantum mechanics of a charged particle in the field of a magnetic monopole is very rich and has increased our understanding of the mathematical structures underlying this description, as well as of its physical implications. In this short review, we present four different arguments all leading to the Dirac quantization condition, emphasizing their geometrical and topological aspects.
Teoría de semigrupos fuertemente continuos de operadores lineales continuos aplicada a una ecuación de transporte-Difusión
Authors: Galo Leandro Jesús
Published: April 2019

En este trabajo aplicamos la teoría de semigrupos de operadores lineales continuos para probar la existencia y unicidad de la solución para cierta ecuación de transporte-difusión, en concreto aquellos que son fuertemente continuos, ya que estos son generados por un operados lineal usualmente denotado por A y llamado comúnmente el generador infinitesimal del semigrupo. Este operador es de gran importancia puesto que suele ser el operador relacionado a una ecuación o sistema de ecuaciones diferenciales, es decir, relacionamos la ecuación de transporte-difusión a un operador diferencial lineal, el cual genera a un semigrupo fuertemente continuo, y así aplicamos ciertos resultados conocidos en el área de los semigrupos y lo que nos permitirá probar la existencia y unicidad de la solución para nuestra ecuación, en contraste con los métodos clásicos conocidos.
NÍVEIS DE INCLUSÃO DE CAULIM NA RAÇÃO DE CODORNAS JAPONESAS NO FINAL DO CICLO PRODUTIVO
Authors: Justino Lucas Rodrigo , Calixto Ligia Fatima Lima , Reis Túlio Leite , Lemos Marina Jorge de , Soares Pollianna Luciene da Silva
Published: April 2019

O objetivo desse trabalho foi avaliar o melhor nível de inclusão de caulim na ração de codornas japonesas no final do ciclo produtivo sobre o desempenho, qualidade dos ovos e umidade das excretas. Foram utilizadas 256 codornas japonesas com 54 semanas de idade, distribuídas em delineamento inteiramente casualizado, com quatro tratamentos, oito repetições, contendo 8 aves por repetição. Os tratamentos foram: tratamento 1 = controle (dieta referência sem inclusão de caulim); tratamento 2 = dieta referência com inclusão de 1,5% de caulim; tratamento 3 = dieta referência com inclusão de 3,0% de caulim e tratamento 4 = dieta referência com inclusão de 4,5% de caulim. As variáveis estudadas: consumo de ração, produção de ovos, massa de ovos, conversão alimentar, viabilidade, Unidade Haugh, Índice de Gema (IG), porcentagem de componentes do ovo (casca, albúmen e gema); pigmentação da gema; pH da gema e do albúmen, espessura da casca, porcentagem da casca em e umidade das excretas.  A inclusão de caulim demonstrou comportamento quadrático melhorando o desempenho e aumentando o peso dos ovos no final do ciclo produtivo das codornas.
Morphological Features in the English Language of Selected Nigerian Paramilitary Formations in Akwa Ibom State
Authors: Uwen God’sgift Ogban
Published: April 2019

This paper seeks to investigate the official communicative activities among Nigerian paramilitary formations in Akwa Ibom State, with a view to determining the peculiar forms generated through morphological processes that occur in their interactions. The agencies selected for the study are: the Nigeria Police Force, the Federal Road Safety Corps and the Nigeria Security and Civil Defence Corps. The theoretical framework adopted for, and considered relevant to the study is Lieb’s Theory of Process Model of Word Formation. The theory offers a comprehensive approach which accounts for all processes of word formation in a unified way. Data used for the study were collected through participant observation and unstructured interview of personnel while on duty within the office environment using random sampling method. The findings indicate that the operatives used English language for their formal conversations to communicate paramilitary ideology. In addition, they were found to have used unique lexical choices created specifically to serve the communication needs of the interlocutors. It is therefore recommended that operatives of these agencies should ‘simplify’ their morphologically-conditioned terminologies in particular, and the language in general, such that the public which they are meant to serve could understand.
Validation and Vitamin C Testing in Crystal Guava (Psidium guajava L.) With Variations of Origin With the HPLC Method (High Performance Liquid Chromatography)
Authors: Guntarti Any , Hutami Endah Nurvita
Published: April 2019

Crystal guava contains high vitamin C. Vitamin C is contained in different fruits, one of the factors is the altitude of the fruit plant growing areas. This study aims to determine the level of vitamin C in the slurry of crystal guava flesh with variations of origin using the HPLC method. Samples of crystal guava are obtained from the city of Bogor, Malang, and Gunung Kidul. The samples to be analyzed are prepared as a slurry. Qualitative analysis is done by identification using KMnO4 p.a, FeCl3 p.a, AgNO3 p.a as well as comparing the retention time of the sample with vitamin C. Method validation for system suitability, linearity and precision provide results that are eligible according to the applicable regulations. Quantitative analysis using HPLC with C18 stationary phase, water: methanol mobile phase (95: 5) v/v, flow rate of 1 mL/min, and run time of 7.5 minutes. Qualitative analysis by using KMnO4, FeCl3, AgNO3, and retention time (tR) shows positive results of the vitamin C existence. The average levels of vitamin C from Bogor, Malang, and Gunung Kidul, equal to (0.4139 ± 0.004) mg/mL; (0.6746 ± 0.03) mg/mL; and 0.8608 ± 0.002 mg/mL respectively.
THE IMPACT OF IATROGENIC EMBOLISATION AND ENDOVASCULAR REMOVAL OF A FRACTURED CENTRAL VEIN CATHETER ON THE HEALTH RELATED QUALITY OF LIFE (HRQOL)
Authors: Muszyński Tomasz , Polak Karina , Tomala Marek , Iwaszczuk Paweł , Kwiatkowski Tomasz , Trystuła Mariusz
Published: April 2019

Iatrogenic embolisation of the right ventricle of the heart by a fragment of one of the most basic ICU devices, which has fractured and detached the central vein catheter, is rarely described in subject literature. Removing such an element from the heart is highly risky and requires the use of very modern techniques and equipment. The Atrieve Vascular Snare™ was employed in the described patient. Therefore, it is necessary to present this process and its effectiveness through an evaluation of the health related quality of life (HRQoL) associated with the perception of health status by those patients. This is a requirement in modern medicine. The main aim of this paper was to evaluate the HRQoL after this embolisation.

A 67-year-old patient was referred to the Vascular Surgery Department with Endovascular Interventions Ward, John Paul II Hospital in Kraków, after the defragmenting of the central vein catheter and replacement to the right ventricle of the heart. An endovascular approach through the right common femoral vein (RCFV) under local anesthesia of the groin was chosen as the preferred method for removing the broken catheter fragment. The right ventricle of the heart was reached using a 18-30mm Atrieve Vascular Snare™. A structure consisting of three loops facilitated the quick grasp and removal of the catheter fragment at the first attempt through the RCFV. Despite the short time needed for the procedure, the patient experienced periprocedural ventricular fibrillation (VF) with the necessity of defibrillation. After one successful defibrillation attempt, sinus rhythm was restored. The post-operative course showed no complications whatsoever, and the patient was sent to the General Surgery Ward in order for a new Hickman catheter to be implemented and further parenteral nutrition treatment to be carried out.

The endovascular technique with the use of Atrieve Vascular Snare™ is an effective method which was used in the case of our patient under local anesthesia. It provides for the fast, safe and convenient removal of a disrupted and dislocated catheter fragment. It allows one to improve the patient’s HRQoL not only in the short term, but also in the longitudinal (6 months after surgery) follow up.
STROKE IMPACT ON THE COGNITIVE FUNCTIONS OF MOROCCAN NEURO-LESIONED PATIENTS IN THE GHARB REGION
Authors: Mènon Coffi Sèdégnan , Touhami Ahami Ahmed Omar , Latifi Mohamed , Mureşanu Dafin Fior , Gam Imane , Obayagbona Vannessa Osaremien
Published: April 2019

Stroke (ischemic and hemorrhagic stroke) is a sudden-onset neurological deficit resulting from focal vascular lesions. This is due to a clot-induced obstruction of a vessel (ischemic stroke) or a rupture of a vessel causing haemorrhage (hemorrhagic stroke). The management of neuro-injured patients (AVC) is a major public health problem. The principal aim of this study is to evaluate the short and long term neuropsychological sequences following a neurological accident of neuro-injured patients hospitalized at the Kenitra Provincial Center (Morocco) in comparison with the control group.

We tested 34 stroke patients, with an average age sample of 59.12 years, for a standard deviation of 14.35 with extremes between 32 and 82 years. Of these patients, 20 were female (58.82%) and 14 male (41.18%). The sex ratio is 0.7 in favour of the female sex. Both the neuro-lesioned patients and the control group benefited from neuropsychological tests. In the neurocognitive evaluation we used three neuropsychological tests: (a) The bell test or non-verbal bell dam test allows for a selective, visuospatial and strategic attentional evaluation; (b) Raven's test focuses on the nonverbal neuropsychological intelligence where the subject is led to analyze and solve each test problem based on inductive reasoning; (c) The digit memory test is a test to evaluate the short-term verbal memory and working memory capabilities of stroke patients.

Our results showed through the various neurocognitive tests that our stroke patients obtained lowers score, compared to the control group (p <0.05). Raven Standard Progress Matrix Test Scores (SPMR):(Mean-Patients = 32.49, SD = 7.43 < Mean-Controls = 42.01, SD = 3.98). Digit Memory Test scores: Forward digit span (Mean-Patients = 2.21, SD = 0.5 <Mean-Controls = 2.65, SD = 0.49). Backward digit span (Mean-Patients = 1.74; SD = 0.6 <Mean-Controls = 2.41, SD = 0.5). Bell test (Mean-Patients = 24.35; SD = 2.62 < Mean-Controls = 30.18; SD= 2.52). The patient quality of life is consequently highly affected.

Rehabilitation was effective and is very important because it improves cognitive functions such as nonverbal skills, visuospatial and strategic attention, along with the digit memory equally improving patient quality of life.
Choosing a password breaking strategy with imposed time restrictions
Authors: Rodwald Przemysław
Published: April 2019

The aim of the article is to present the password breaking methodology in case when an attacker (forensic investigator, court expert, pen tester) has imposed time restrictions. This is a typical situation during many legal investigations where computers are seized by legal authorities but they are protected by passwords. At the beginning, the current state of law in that matter is presented, along with good practices in seizing the evidence. Then, the ways of storing static passwords in information systems are showed, after which various classes of password breaking methods are reviewed (dictionary, brute-force, rule, combinator, mask, hybrid, etc.). The most popular tools supporting this process are listed as well. The main part of the paper presents the original strategy of conducting an attack on a single hashed password with time constraints. Costs as well as economic efficiency for four different hardware solutions (laptop, gaming computer, rig with 6 GPU’s, cloud computing) are discussed. The calculations are shown on the example of two real attacks carried out by the author in the real legal cases.
Keywords: passwords, breaking passwords, hash functions, computer forensics.
Application of Neural Networks in the Tests of Hand Grenade Fuses
Authors: Ampuła Dariusz
Published: April 2019

The neural networks, which find currently use in the unusually wide range of problems, in such fields as: finance, medicine, geology or physics, were characterized in the article. It was accent, that neural networks are very sophisticated technique of modelling, able to map extremely complex functions. It was noticed particularly, that neural networks had a non-linear character, what very essentially improve the possibilities of their applications.
Some previous applications of neural networks were introduced, both in the area of domestic and foreign, including also military applications.
The fuse of UZRGM type (Universal Modernized Fuse of Hand Grenades) was characterized, describing his building and way of action, special attention-getting on the tested features during laboratory diagnostic tests.
Necessary technical parameters for the first and the second laboratory diagnostic tests, whose purpose was to build two independent neural networks, on the basis of existing test results and undertaken post-diagnostic decisions were designed. A few artificial neural networks were made and finally the best two independent neural networks were chosen. The main parameters of the chosen active neural networks were introduced in the pictures.
Concise information, relating to the built artificial neural networks, for the first and the second laboratory diagnostic tests of the fuses of UZRGM type, was presented in the end of the article. In the summary, clearly distinguished are advantages of the applications of the proposed evaluation method, which significantly shortens an evaluation process of new empirical test results and causes complex automatization of an evaluation process of the tested fuses.
Keywords: artificial intelligence, neural networks, activation function, hidden neurons, fuse.
Los orígenes del Hotel Villapanés, la semblanza de un gran palacio
Authors: Corripio Gil-Delgado Isabel María
Published: April 2019

Resumen: El presente artículo versa sobre la historia del Hotel Villapanés que deriva del antiguo Palacio Torreblanca levantado por don Manuel López Pintado a principios del siglo XVIII. En este sentido la investigación de su parcelado, que hemos dividido en dos etapas hasta el año de 1728 y, a partir de él hasta 2012 en que fue rehabilitado, pretende destacar cómo el devenir histórico que se remonta hasta el siglo XI, cuando se documenta una rica vivienda almorávide, juega un papel fundamental en la valoración real de un inmueble a la hora de enfocar su conservación.Abstract: This article is about the history of the Villapanes Hotel which was originally built as the Torreblanca Palace by don Manuel López Pintado at the beginning of the 18th century. The investigation of its plot, which we have divided into two stages; up until the year 1728, and from then up until 2012 during which it was rehabilitated, aims to highlight how historical development dating back to the 11th century, when a rich housing ‘almorávide’ (almoravid) is documented, plays a fundamental role in the actual valuation of a property when it comes to focus on its conservation.
Las cofradías de Alcalá de Guadaíra a fines de la Edad Media
Authors: Arboleda Goldaracena Juan Carlos
Published: April 2019

Resumen: En el presente trabajo abordamos, a partir de la documentación notarial, el estudio de las distintas cofradías existentes en Alcalá de Guadaíra a finales de la Edad Media. Estudiamos las advocaciones bajo las que estaban erigidas, su composición, sus órganos de gobierno y las propiedades en las que basaban su vida económica. A pesar de la escasez de datos que ofrecen para la época estudiada, los protocolos notariales son prácticamente la única documentación disponible para el acercamiento al tema.Abstract: In this paper we aim to know the confraternities present in Alcalá de Guadaíra (Seville, Spain) at the end of the Middle Ages using notarial documentation. We study their devotions, their social composition, their administration and their properties and economic resources. Although notarial documentation does not offer many information in the case of Late Middle Ages, it is almost the only source in order to study confraternities during this period.
Entrenamiento Fonético por Ordenador para la Adquisición de Segundas Lenguas: ¿Son Efectivos estos Sistemas de Aprendizaje?
Authors: Calvo Carmona Daniel , César Garrido Laura
Published: April 2019

Resumen: El presente estudio revisa una serie estudios sobre la efectividad del aprendizaje del componente fonético de las segundas lenguas mediante el uso de sistemas asistidos por ordenador, atendiendo a los criterios de la escala de calidad metodológica MQS (Sanduvete, 2008, p. 285). Se realiza una búsqueda exhaustiva en las bases de datos más importantes para obtener un total de 66 estudios e identificar los problemas metodológicos más importantes. Los resultados de la revisión sugieren que la mayoría de estudios sobre entrenamiento fonético poseen una calidad de media, especialmente debido a la falta de seguimiento, la falta de métodos de enmascaramiento, y que puedan existir variables extrañas que no se han tenido en cuenta. A partir de estos datos, se incluye una propuesta de mejora en forma de una serie de recomendaciones para mejorar la calidad de estudios posteriores.Abstract: The present study reviews research on the effectiveness of the acquisition of the phonetics of a second language through the use of computer assisted systems, following the assessment criteria of the methodological quality scale MQS developed by Sanduvete (2008, p. 285). A comprehensive search is conducted in the most important databases to obtain a total of 66 studies and identify potential methodological problems. Results suggest that most studies on phonetic training have average quality, especially due to lack of follow-up, absence of masking methods, and the failure to account for possible extraneous variables. A proposal is included in the form of a series of recommendations to improve study quality in future studies.
Sociodemographics and School Environment Correlates of Clustered Oral and General Health Related Behaviours in Tanzanian Adolescents
Authors: Kahabuka Febronia Kokulengya , Mbawalla Hawa Shariff , Mumghamba Elifuraha Godson , Petersen Poul Erik
Published: April 2019

Objectives: To identify underlying clusters of general and oral health behaviours and acertain possible factors influencing the existence of the behaviours.
Materials and Methods: A cross sectional study was conducted among 4,847 school adolescents aged 11 to 17 years. Data were collected using a structured questionnaire in Kiswahili inquiring about general and oral health related behaviours, socio-demographics and adolescents’ school relationship. Principal component analysis was employed to identify clusters of health behaviour. Frequency distribution for proportions, cross tabulations with chi-square and a two stage binary logistic regression were done.
Results: Principal component analysis identified four clusters from twelve health behaviours; hygiene practices, dietary behaviours, cigarette smoking & alcohol consumption and sedentary related behaviours. Girls, OR 0.8 (95% CI 0.7, 0.9); secondary school attendees, OR 0.5 (95% CI 0.4, 0.7) and adolescents with good school relationship OR 0.7 (95% CI 0.6, 0.8) were less likely to smoke or use alcohol. Urban residents were less likely OR 0.8, (95% CI 0.7, 0.9) to report acceptable dietary behaviours. Adolescents whose fathers had secondary education or higher, were in secondary schools and had good school relationship were most likely to have acceptable hygiene behaviours, OR 1.4 (95% CI 1.2, 1.6), 1.6 (95% CI 1.1, 2.2) and 1.4 (95% CI 1.3, 1.7), respectively.
Conclusion: Oral and general health behaviours of Tanzanian adolescents factored into four clusters with hygiene behaviours being most practiced and physical exercise the least. The clustered behaviours were influenced by socio-demographics and school environment.