bluuebunny/crossref_metadata_2025 huggingface dataset:
Субэскпоненциальная асимптотика вероятностей больших уклонений для системы обслуживания с регенерирующим входящим потоком
Authors: Aibatov Serik Zhagalbaevich , Afanas'eva Larisa Grigor'evna
Published: July 2017

Рассматривается одноканальная система обслуживания с регенерирующим входящим потоком. Получены условия, при которых виртуальное время ожидания в стационарном режиме имеет субэкспоненциальное распределение. Отдельно рассмотрен частный случай, когда времена обслуживания - независимые одинаково распределенные случайные величины, не зависящие от входного потока. Результаты применены к трем системам: с ненадежным прибором, с дважды стохастическим пуассоновским потоком, с марковски модулированным полумарковским потоком.
Асимптотические свойства одношаговых взвешенных $M$-оценок с приложениями к задачам регрессии
Authors: Linke Yuliana Yurievna
Published: July 2017

В работе изучается асимптотическое поведение одношаговых взвешенных $M$-оценок, построенных по выборке независимых необязательно одинаково распределенных случайных величин и являющихся явными приближениями для соответствующих состоятельных $M$-оценок. Найдены достаточно общие условия асимптотической нормальности изучаемых оценок.
В качестве приложений рассматриваются классические задачи нелинейной регрессии, для которых процедура одношагового оценивания позволяет в явном виде находить оценки, совпадающие по точности с оценками наименьших квадратов или квазиправдоподобия.
A factorial moment distance and an application to the matching problem
Authors: Afendras Georgios , Papadatos Nickos
Published: July 2017

В этой заметке мы вводим понятие расстояния факториальных моментов для неотрицательных целочисленных случайных величин
и сравниваем его с расстоянием по вариации. Кроме этого, мы изучаем скорость сходимости в классической задаче о составлении пар
и в обобщенной задаче о составлении пар.
Характеризационная теорема Хейде на некоторых локально компактных абелевых группах
Authors: Feldman Gennadiy Mikhailovich
Published: July 2017

Согласно теореме Хейде, гауссовское распределение на вещественной прямой характеризуется симметрией условного распределения одной линейной формы от $n$ независимых случайных величин при фиксированной второй. При $n=2$ мы доказываем аналоги этой теоремы в случае, когда случайные величины принимают значения в локально компактной абелевой группе $X$, а коэффициенты линейных форм - топологические автоморфизмы $X$.
The siblings of the coupon collector
Authors: Doumas Aristides V. , Papanicolaou Vassilis G.
Published: July 2017

Относительно недавно значительный интерес привлекла к себе следующая версия задачи о коллекционере.
Есть один основной коллекционер, собирающий купоны. Предполагается, что купоны принадлежат к $N$ различным типам, которые встречаются, вообще говоря, с разными вероятностями. Когда у основного коллекционера появляется «дубль», она отдает его старшему из братьев; когда у этого брата появляется «дубль», он отдает его следующему по старшинству брату, и т. д. Таким образом, в тот момент, когда основной коллекционер соберет полную коллекцию, в альбоме $j$-го коллекционера, $j=2,3,…$, останется еще $U_j^N$ свободных мест. В настоящей статье мы развиваем технику нахождения асимптотики (в большинстве случаев трех первых членов и ошибки) среднего $\mathbf{E}[U_j^N]$ случайной величины $U_j^N$ при $N\to\infty$ для широкого класса семейств вероятностей появления купонов. Примечательно, что в некоторых случаях среднее $\mathbf{E}[U_j^N]$ для любого $j\ge2$ стремится при $N\to\infty$ к конечному пределу. Наши результаты охватывают ряд популярных распределений, таких как экспоненциальное, полиномиальное, логарифмическое и хорошо известный своими приложениями обобщенный закон Ципфа. Мы также формулируем гипотезу о максимуме величин $\mathbf{E}[U_j^N]$.
Approche multimodale de deux types de tâches orales réalisées de face à face et à distance en L3 (français)
Authors: Delgar-Farrés Gemma
Published: July 2017

La présente contribution s’inscrit au croisement des champs de la description de l’interaction orale à distance et de l’apprentissage par tâches (TBLT) dans l’enseignement des langues étrangères. À partir d’une étude expérimentale, nous nous proposons d’analyser l’impact du dispositif visiophonique en ligne sur la réalisation de deux types de tâches pédagogiques (jigsaw et ranking) en langue française (L3) du point de vue de la communication verbale et la communication non verbale.
MOOC y el aprendizaje de una lengua extranjera: ¿Back to the future?
Authors: Varela Salinas María José , Burbat Ruth
Published: July 2017

Cada vez se ofertan más MOOC, y poco a poco también en el campo de las lenguas extranjeras. Debido a las características de los MOOC como una forma de enseñanza-aprendizaje que se dirige a un público potencialmente ilimitado, su metodología está sujeta a dichas particularidades, que necesariamente influyen en la consecución de las competencias en las destrezas comunicativas como la expresión oral y escrita y la comprensión oral y lectora. Nuestra contribución versa sobre estos límites de los MOOC y plantea la duda de hasta qué punto la metodología relacionada constituye un paso atrás hacia enfoques fundamentalmente formales ya superados en el campo de las lenguas extranjeras.
Metodología de corpus y formación en la traducción especializada (inglés-español): una propuesta para la mejora de la adquisición de vocabulario especializado
Authors: Sánchez Ramos María del Mar
Published: July 2017

El presente artículo tiene como principal objetivo ejemplificar la metodología de corpus en la etapa inicial de adquisición de vocabulario especializado como parte del desarrollo de la competencia léxica traductora. En un primer momento el trabajo se adentra en el concepto de competencia léxica traductora. Seguidamente, se describe cómo la metodología de corpus ocupa un lugar primordial en la formación de traductores y cómo puede ayudar en la fase de pretraducción (traducción inversa) de un texto científico. Finalmente se propone el uso de un corpus virtual monolingüe como herramienta documental previa para la adquisición de vocabulario especializado y la valoración inicial de la propuesta por parte del alumnado.
Training teachers for English Medium Instruction: lessons from research on second language listening comprehension
Authors: Martín del Pozo María Ángeles
Published: July 2017

CLIL (Content and Language Integrated Learning) and EMI (English Medium Instruction) practices have outpaced theory and teacher training. There is a need to provide answers to some of the key issues such as the language requirements. This paper aims to show that knowledge from English for Specific Purposes and English for Academic Purposes, fields which have provided effective teaching practices and materials, could now be used in CLIL/EMI. The paper focuses on two of these. First, the issues related to second language academic listening comprehension and, secondly, the findings from research on it and their implications for student / lecturer training and materials design. These implications and suggestions are summarized. The paper concludes providing some language learning resources originally targeted to students but which could become tools for (self) training of those teachers who need to update their language skills for CLIL.
 
Competencia traductora y recursos informáticos: por qué las tecnologías no sustituyen la formación en traducción
Authors: Piccioni Sara , Pontrandolfo Gianluca
Published: July 2017

El artículo presenta los resultados de un experimento realizado en las Universidades de Trieste y de Chieti (Italia) orientado a estudiar la relación entre competencia traductora y el uso de recursos informáticos. Para llevar a cabo el presente estudio se ha contado con la participación de dos grupos de estudiantes: uno especializado en Traducción (Trieste) y otro con limitada formación en Traducción (Chieti). Ambos realizaron una prueba de traducción directa y otra de traducción inversa, y contestaron un cuestionario final sobre el razonamiento seguido para resolver algunos puntos problemáticos planteados en las traducciones. Los resultados sugieren algunas tendencias significativas relativas al proceso de toma de decisiones, y a la relación entre calidad de la traducción y los recursos empleados para realizar dicha traducción. En particular, se ha observado que el uso de recursos informáticos no compensa ni la diferencia de nivel en las competencias lingüísticas y conocimientos especializados ni la menor formación en traducción por parte del segundo grupo. El artículo concluye con algunas consideraciones didácticas para aportar posibles soluciones en las áreas más problemáticas que se identificaron durante el experimento.

 
Généralités syntaxiques des titres sportifs dans des journaux en ligne
Authors: Quintero-Ramírez Sara
Published: July 2017

Dans cet article, nous nous proposons d’exposer les traits syntaxiques les plus caractéristiques des titres sportifs de six journaux dans leur version électronique. Pour ce faire, nous analysons un corpus de 300 titres de six journaux : Le Monde, Le Figaro, La Croix, L’Équipe, Sport.fr et Compétition. Tous les titres ont été tirés du mois de juin 2014. En tenant compte des études antérieures sur les titres de presse (Mouillaud, 1982 ; Vinet, 1993 ; Furet, 1995 ; Engel, 2000 ; Abouda, 2001 ; Tahar, 2012), nous analysons, d’abord, si les titres sont rédigés sous forme de construction verbale, de syntagme nominal (SN), de syntagme prépositionnel (SP) ou autre. Ensuite, nous déterminons la disposition la plus fréquente selon laquelle sont organisés les différents éléments linguistiques caractéristiques des titres. Enfin, nous observons si le titreur a fait des ellipses.
Midluteal Serum Estrogen and Progesterone Levels predict Pregnancy Rate in in vitro Fertilization/Intracytoplasmic Sperm Injection Cycles: A Prospective Study
Authors: Shankar Kundavi , Nigam Shipra , Joy Indumathi , Varma Thankam R
Published: July 2017

Introduction

In assisted reproduction technique cycles, controlled ovarian stimulation (COS) leads to supraphysiological levels of steroid hormone secretion and the subsequent need for luteal phase support (LPS). Therefore, existing data on the steroid secretion profile in the luteal phase of spontaneous conception cycles and its predictive value for pregnancy outcome need to be discussed against the background of preceding COS. The clinical significance of luteal phase hormones, such as estrogen (E2) and progesterone (P4), in predicting pregnancy after controlled ovarian hyperstimulation protocols forin vitrofertilization (IVF) or intracytoplasmic sperm injection (ICSI) is still poorly understood. The aim of the present study was to investigate the role of midluteal serum E2 and P4 level in predicting successful pregnancy in patients undergoing IVF/ICSI.

Materials and methods

One hundred fifteen women were recruited for the study. They were given gonadotropin-releasing hormone antagonist protocol and human chorionic gonadotropin (hCG) was administered if at least three follicles were more than 18 mm in size. Transvaginal ultrasound-guided oocyte retrieval followed by ICSI and embryo transfer (ET) was done. Post-ET, all women had same LPS. The E2 and P4 measurements were done at day of ET (day 0) and 9 days post-ET (day 9). Levels of E2 and P4 were compared between those who subsequently became pregnant and those who could not achieve pregnancy. Statistical analysis was performed using Statistical Package for the Social Sciences.

Results

Forty-six (40%) achieved pregnancy. The E2 and P4 levels on day 9 were significantly higher in those who achieved pregnancy (p < 0.01). Out of 46 pregnancies, 38 were ongoing viable pregnancies.

Conclusion

Luteal phase E2 and P4 can be used as prognostic marker to predict pregnancy in IVF/ICSI cycles.

How to cite this article

Nigam S, Joy I, Shankar K, Varma TR. Midluteal Serum Estrogen and Progesterone Levels predict Pregnancy Rate inin vitroFertilization/Intracytoplasmic Sperm Injection Cycles: A Prospective Study. Int J Infertil Fetal Med 2017;8(2):50-53.
Study of the Significance of Fetal Doppler Flow Velocimetry in the Perinatal Outcome of Growth-restricted Fetuses
Authors: Singhania Shraddha , Singhania Akhita , Khan Saherish
Published: July 2017

Purpose

To evaluate clinically suspected cases of intrauterine growth restriction (IUGR) for Doppler study of uterine artery, umbilical artery, and fetal middle cerebral artery. To compare the various indices of the three vessels in predicting perinatal outcome. To evaluate the positive predictive value among these parameters. To compare the Doppler findings with fetal outcome.

Materials and methods

One hundred and two singleton pregnancies complicated by IUGR and severe preeclampsia or both were prospectively examined with Doppler ultrasound of the umbilical artery, middle cerebral artery, and umbilical vein which were compared with 104 uncomplicated pregnancies that formed the control group.

Observation and Results

One hundred and two singleton pregnancies included in the study population had at least one major or minor adverse outcome. Major adverse outcome criteria included perinatal deaths — including intrauterine and early neonatal deaths, etc. Minor outcomes included cesarean delivery for fetal distress, APGAR score below 7 at 5 minutes, and admission to neonatal intensive care unit for treatment.

Conclusion

Low diastolic and high indices characterize the pregnancies with abnormal outcomes. The uterine artery had a better sensitivity and specificity as compared with the umbilical arteries and diastolic notch had the highest sensitivity and specificity. Doppler also provides a noninvasive method of assessing the fetal and maternal circulation during pregnancy.

How to cite this article

Kumar V, Sharma G, Khan S, Singhania A, Singhania S. Study of the Significance of Fetal Doppler Flow Velocimetry in the Perinatal Outcome of Growth-restricted Fetuses. Int J Infertil Fetal Med 2017;8(2):83-88.
Prenatal Diagnosis and Postnatal Management of Congenital Pulmonary Airway Malformation
Authors: Nambiar Rema , Nayak Dinesh , Shah Krupa H , K Bhat Shashikala
Published: July 2017

Congenital pulmonary airway malformation (CPAM) is a rare developmental lung abnormality. It is also referred as a congenital cystic adenomatoid malformation. The exact etiology is not known yet. The majority of cases are detected during targeted prenatal scan or within 2 years of the birth. Here, we report a case of CPAM type II diagnosed at 23 weeks of gestation, the key diagnostic features of which were mediastinal shift and lung lesion. The fetus had transient polyhydramnios and pericardial effusion. Glucocorticoids were administered for threatened preterm labor and CPAM. Healthy neonate was delivered at term without any immediate neonatal complications.

How to cite this article

Bhat SK, Nambiar R, Nayak D, Shah KH. Prenatal Diagnosis and Postnatal Management of Congenital Pulmonary Airway Malformation. Int J Infertil Fetal Med 2017;8(2):89-92.
Um Sentido para a Legitimidade do Direito: consciência, ação e interação
Authors: Naspolini Sanches Samyra , Da Silva Luciano Braz
Published: July 2017

http://dx.doi.org/10.5007/2177-7055.2016v37n73p113O presente artigo pretende fazer uma releitura dos pressupostos de validade do direito tomando como campo de pesquisa o mundo da vida interpretado como esfera em que suscitam os discursos, os diálogos interpelativos e, em última instância, a esfera do exercício democrático. Diante das questões fenomenológicas de conteúdo político e econômico, que de algum modo atingem os direitos fundamentais, a validade do direito assume relevância quando as discussões ligadas aos direitos fundamentais do homem, sua dignidade e reconhecimento e sua compreensão do Estado Democrático de Direito, são rediscutidas, considerando, sobretudo, situações paradoxais que apontam pessoas, grupos e etnias que se encontram esquecidas pela sociedade. Este esboço é suficiente para levantar uma típica questão das sociedades modernas: como estabilizar, na perspectiva própria dos atores, a validade de uma ordem social legítima do ponto de vista do direito diante do multiculturalismo nacional e global?
Contratos internacionais eletrônicos e o direito brasileiro: entre a insuficiência normativa doméstica e as soluções globais
Authors: Bertini Pasquot Polido Fabrício , Sávio Oliveira da Silva Lucas
Published: July 2017

http://dx.doi.org/10.5007/2177-7055.2017v38n75p157O artigo explora questões relativas à interface entre contratos internacionais eletrônicos e direito internacional privado. Na atualidade, graças à internet, relações comerciais transfronteiriças que poderiam ser impensáveis se tornam possíveis. Contudo, pelas próprias especificidades da internet, contratos contendo elementos de conexão trazem dúvidas quanto à determinação da lei aplicável ou mesmo quanto à validade e à compreensão de sua formação, dentre outras. Diferentemente da extensa agenda normativa estabelecida pela Comissão das Nações Unidas para o Direito do Comércio Internacional sobre o tema, o Brasil necessita avaliar as iniciativas existentes e projetar soluções necessárias para a garantia da segurança jurídica nesse campo.
A teoria da ponderação de princípios na encruzilhada do decisionismo judicial: limita-me ou te devoro!
Authors: Da Silva Cristóvam José Sérgio
Published: July 2017

http://dx.doi.org/10.5007/2177-7055.2017v38n75p219O artigo aborda a teoria da ponderação de princípios, com base nos contornos traçados pelo neoconstitucionalismo. O modelo ponderacionista tem sofrido críticas sólidas e abalizadas, na medida em que submete o discurso judicial a um profundo deficit de legitimidade e de racionalidade, abrindo caminho para uma clara usurpação da autoridade legislativa por um modelo teórico que permite o império do decisionismo subjetivo e do moralismo judicial. Isso conduz à necessidade de se estabelecerem limites procedimentais e materiais capazes de assegurar a racional aplicação do sistema, essencial fator de legitimação e justificação das decisões sobre conflitos entre princípios e interesses.
Percepções sobre o poder dos dirigentes máximos dos serviços do ministério da justiça em Portugal: evidências estatísticas de diferenças em função do gênero dos colaboradores?
Authors: Correia Pedro Miguel Alves Ribeiro
Published: July 2017

Neste artigo são apresentados os resultados de um estudo sobre as percepções dos colaboradores dos serviços do Ministério da Justiça em Portugal acerca do poder detido pelo dirigente máximo do serviço ao qual pertencem. É dada particular atenção à temática do gênero, utilizando a dicotomia homem-mulher enquanto caso particular da componente disposicional das perceções.Foi realizado um inquérito por questionário a 458 colaboradores dos serviços do Ministério da Justiça português. Os resultados obtidos evidenciam estatisticamente que as percepções sobre o poder detido pelo dirigente máximo do serviço, onde cada participante no estudo desenvolve a sua atividade laboral, apresentam diferenças em função do gênero.
Algumas reflexões críticas sobre a tese da “abstrativização” do controle concreto de constitucionalidade no Supremo Tribunal Federal (STF)
Authors: Sgarbossa Luis Fernando , Iensue Geziela
Published: July 2017

http://dx.doi.org/10.5007/2177-7055.2017v38n75p79A questão da eficácia das decisões judiciais em sistemas complexos de controle de constitucionalidade, como o brasileiro, é premente. Nem todos os aspectos relevantes relativos à eficácia das decisões da suprema corte brasileira são pacíficos, como questões correlatas à amplitude, entre outras questões. O presente artigo explora a discussão acerca da tese da “abstrativização” da jurisdição do Supremo Tribunal Federal (STF) no controle concreto de constitucionalidade. A partir de um resgate do desenvolvimento histórico do controle brasileiro de constitucionalidade, o artigo procura examinar criticamente as teses sustentadas por alguns Ministros do STF especialmente por ocasião do julgamento da Reclamação n. 4.335/AC. Ao final busca-se demonstrar que é plausível sustentar que a tese referida encontra, ao que parece, alguns limites no Direito Constitucional positivo brasileiro, sendo admissível apenas mediante uma reforma constitucional formal.
Vertical distribution of the particle phase in tropical deep convective clouds as derived from cloud-side reflected solar radiation measurements
Authors: Jäkel Evelyn , Wendisch Manfred , Krisna Trismono C. , Ewald Florian , Kölling Tobias , Jurkat Tina , Voigt Christiane , Cecchini Micael A. , Machado Luiz A. T. , Afchine Armin , Costa Anja , Krämer Martina , Andreae Meinrat O. , Pöschl Ulrich , Rosenfeld Daniel , Yuan Tianle
Published: July 2017

Abstract. Vertical profiles of cloud particle phase in tropical deep convective clouds (DCCs) were investigated using airborne solar spectral radiation data collected by the German High Altitude and Long Range Research Aircraft (HALO) during the ACRIDICON-CHUVA campaign, which was conducted over the Brazilian rainforest in September 2014. A phase discrimination retrieval based on imaging spectroradiometer measurements of DCC side spectral reflectivity was applied to clouds formed in different aerosol conditions. From the retrieval results the height of the mixed-phase layer of the DCCs was determined. The retrieved profiles were compared with in situ measurements and satellite observations. It was found that the depth and vertical position of the mixed-phase layer can vary up to 900 m for one single cloud scene. This variability is attributed to the different stages of cloud development in a scene. Clouds of mature or decaying stage are affected by falling ice particles resulting in lower levels of fully glaciated cloud layers compared to growing clouds. Comparing polluted and moderate aerosol conditions revealed a shift of the lower boundary of the mixed-phase layer from 5.6 ± 0.2 km (269 K; moderate) to 6.2 ± 0.3 km (267 K; polluted), and of the upper boundary from 6.8 ± 0.2 km (263 K; moderate) to 7.4 ± 0.4 km (259 K; polluted), as would be expected from theory.
OMI-measured increasing SO2 emissions due to energy industry expansion and relocation in northwestern China
Authors: Ling Zaili , Huang Tao , Zhao Yuan , Li Jixiang , Zhang Xiaodong , Wang Jinxiang , Lian Lulu , Mao Xiaoxuan , Gao Hong , Ma Jianmin
Published: July 2017

Abstract. The rapid growth of economy makes China the largest energy consumer and sulfur dioxide (SO2) emitter in the world. In this study, we estimated the trends and step changes in the planetary boundary layer (PBL) vertical column density (VCD) of SO2 from 2005 to 2015 over China measured by the Ozone Monitoring Instrument (OMI). We show that these trends and step change years coincide with the effective date and period of the national strategy for energy development and relocation in northwestern China and the regulations in the reduction of SO2 emissions. Under the national regulations for the reduction of SO2 emissions in eastern and southern China, SO2 VCD in the Pearl River Delta (PRD) of southern China exhibited the largest decline during 2005–2015 at a rate of −7 % yr−1, followed by the North China Plain (NCP) (−6.7 % yr−1), Sichuan Basin (−6.3 % yr−1), and Yangtze River Delta (YRD) (−6 % yr−1). The Mann–Kendall (MK) test reveals the step change points of declining SO2 VCD in 2009 for the PRD and 2012–2013 for eastern China responding to the implementation of SO2 control regulation in these regions. In contrast, the MK test and regression analysis also revealed increasing trends of SO2 VCD in northwestern China, particularly for several hot spots featured by growing SO2 VCD in those large-scale energy industry bases in northwestern China. The enhanced SO2 VCD is potentially attributable to increasing SO2 emissions due to the development of large-scale energy industry bases in energy-abundant northwestern China under the national strategy for the energy safety of China in the 21st century. We show that these large-scale energy industry bases could overwhelm the trends and changes in provincial total SO2 emissions in northwestern China and contribute increasingly to the national total SO2 emissions in China. Given that northwestern China is more ecologically fragile and uniquely susceptible to atmospheric pollution than the rest of China, increasing SO2 emissions in this part of China should not be overlooked and merit scientific research.
Effect of Relative Humidity on the Composition of Secondary
Organic Aerosol from Oxidation of Toluene
Authors: Hinks Mallory L. , Montoya-Aguilera Julia , Ellison Lucas , Lin Peng , Laskin Alexander , Laskin Julia , Shiraiwa Manabu , Dabdub Donald , Nizkorodov Sergey A.
Published: July 2017

Abstract. The effect of relative humidity (RH) on the chemical composition of secondary organic aerosol (SOA) formed from low-NOx toluene oxidation was investigated. SOA samples were prepared in an aerosol smog chamber at <2% RH and 75% RH, collected on Teflon filters and analyzed with nanospray desorption electrospray ionization high-resolution mass spectrometry (nano-DESI-HRMS). Measurements revealed a significant reduction in the fraction of oligomers present in the SOA generated at 75% RH compared to SOA generated under dry conditions. In a separate set of experiments, the particle mass concentrations were measured with a Scanning Mobility Particle Sizer (SMPS) at RHs ranging from <2% to 90%. It was found that the particle mass loading decreased by nearly an order of magnitude when RH increased from <2% to 75–90% for low-NOx toluene SOA. The volatility distributions of the SOA compounds, estimated from the distribution of molecular formulas using the molecular corridor approach, confirmed that SOA became more volatile on average under high RH conditions. In contrast, the effect of RH on SOA mass loading was found to be much smaller for high-NOx toluene SOA. The observed increase in the oligomer fraction and particle mass loading were attributed to enhancement of condensation reactions under dry conditions.
Resolving nanoparticle growth mechanisms from size- and
time-dependent growth rate analysis
Authors: Pichelstorfer Lukas , Stolzenburg Dominik , Ortega John , Karl Thomas , Kokkola Harri , Laakso Anton , Lehtinen Kari E. J. , Smith James N. , McMurry Peter H. , Winkler Paul M.
Published: July 2017

Abstract. Atmospheric new particle formation occurs frequently in the global atmosphere and may play a crucial role in climate by affecting cloud properties. The relevance of newly formed nanoparticles depends largely on the dynamics governing their initial formation and growth to sizes where they become important for cloud microphysics. One key to the proper understanding of nanoparticle effects on climate is therefore hidden in the growth mechanisms. In this study we have developed and successfully tested two independent methods based on the aerosol general dynamics equation, allowing detailed retrieval of time- and size-dependent nanoparticle growth rates. Both methods were used to analyze particle formation from two different biogenic precursor vapors in controlled chamber experiments. Our results suggest that growth rates below 10 nm show much more variation than is currently thought and pin down the decisive size range of growth at around 5 nm where in-depth studies of physical and chemical particle properties are needed.
Sediment phosphorus speciation and mobility under dynamic redox conditions
Authors: Parsons Chris T. , Rezanezhad Fereidoun , O'Connell David W. , Van Cappellen Philippe
Published: July 2017

Abstract. Anthropogenic nutrient enrichment has caused phosphorus (P) accumulation in many freshwater sediments, raising concerns that internal loading from legacy P may delay the recovery of aquatic ecosystems suffering from eutrophication. Benthic recycling of P strongly depends on the redox regime within surficial sediment. In many shallow environments, redox conditions tend to be highly dynamic as a result of, among others, bioturbation by macrofauna, root activity, sediment resuspension and seasonal variations in bottom-water oxygen (O2) concentrations. To gain insight into the mobility and biogeochemistry of P under fluctuating redox conditions, a suspension of sediment from a hypereutrophic freshwater marsh was exposed to alternating 7-day periods of purging with air and nitrogen gas (N2), for a total duration of 74 days, in a bioreactor system. We present comprehensive data time series of bulk aqueous- and solid-phase chemistry, solid-phase phosphorus speciation and hydrolytic enzyme activities demonstrating the mass balanced redistribution of P in sediment during redox cycling. Aqueous phosphate concentrations remained low ( ∼  2.5 µM) under oxic conditions due to sorption to iron(III) oxyhydroxides. During anoxic periods, once nitrate was depleted, the reductive dissolution of iron(III) oxyhydroxides released P. However, only 4.5 % of the released P accumulated in solution while the rest was redistributed between the MgCl2 and NaHCO3 extractable fractions of the solid phase. Thus, under the short redox fluctuations imposed in the experiments, P remobilization to the aqueous phase remained relatively limited. Orthophosphate predominated at all times during the experiment in both the solid and aqueous phase. Combined P monoesters and diesters accounted for between 9 and 16 % of sediment particulate P. Phosphatase activities up to 2.4 mmol h−1 kg−1 indicated the potential for rapid mineralization of organic P (Po), in particular during periods of aeration when the activity of phosphomonoesterases was 37 % higher than under N2 sparging. The results emphasize that the magnitude and timing of internal P loading during periods of anoxia are dependent on both P redistribution within sediments and bottom-water nitrate concentrations.
Groundwater withdrawal in randomly heterogeneous coastal aquifers
Authors: Siena Martina , Riva Monica
Published: July 2017

Abstract. We analyze the combined effects of aquifer heterogeneity and pumping operations on seawater intrusion (SWI) in coastal aquifers, a phenomenon which is threatening Mediterranean and worldwide regions. We conceptualize the aquifer as a three-dimensional randomly heterogeneous porous medium, where the spatial distribution of permeability is uncertain. The geological setting of our study is patterned after the coastal aquifer of the Argentona river basin, in the Maresme region of Catalonia (Spain). Numerical simulations of transient, three-dimensional, variable-density flow and solute transport are performed within a stochastic Monte Carlo framework. We consider a variety of groundwater withdrawal schemes, designed by varying the screen location along the vertical direction and the distance of the wellbore from the coastline and from the freshwater-saltwater mixing zone, in order to assess the impact of the pumping scenario on the contamination of the freshwater pumping well for a prescribed production rate. SWI is analyzed by examining isoconcentration curves and global dimensionless quantities characterizing (i) inland penetration of the saltwater wedge and (ii) width of the mixing zone. Our results indicate that heterogeneity affects the (three-dimensional) seawater wedge either in the presence or in the absence of pumping, by reducing toe penetration and enlarging the width of the mixing zone. Simultaneous extraction of fresh and saltwater from two screens along the same wellbore located within the transition zone is effective in limiting SWI during groundwater resources exploitation.
A comparison of the discrete cosine and wavelet transforms for hydrologic model input data reduction
Authors: Wright Ashley , Walker Jeffrey P. , Robertson David E. , Pauwels Valentijn R. N.
Published: July 2017

Abstract. The treatment of input data uncertainty in hydrologic models is of crucial importance in the analysis, diagnosis and detection of model structural errors. Data reduction techniques decrease the dimensionality of input data, thus allowing modern parameter estimation algorithms to more efficiently estimate errors associated with input uncertainty and model structure. The discrete cosine transform (DCT) and discrete wavelet transform (DWT) are used to reduce the dimensionality of observed rainfall time series for the 438 catchments in the Model Parameter Estimation Experiment (MOPEX) data set. The rainfall time signals are then reconstructed and compared to the observed hyetographs using standard simulation performance summary metrics and descriptive statistics. The results convincingly demonstrate that the DWT is superior to the DCT in preserving and characterizing the observed rainfall data records. It is recommended that the DWT be used for model input data reduction in hydrology in preference over the DCT.
Decoupled simulations of offshore wind turbines with reduced rotor loads and aerodynamic damping
Authors: Schafhirt Sebastian , Muskulus Michael
Published: July 2017

Abstract. Decoupled load simulations are a computationally efficient method to perform a dynamic analysis of an offshore wind turbine. Modelling the dynamic interactions between rotor and support structure, especially the damping caused by the rotating rotor, is of importance, since it influences the structural response significantly and has a major impact on estimating fatigue lifetime. Linear damping is usually used for this purpose, but experimentally and analytically derived formulas to calculate an aerodynamic damping ratio often show discrepancies to measurement and simulation data. In this study decoupled simulation methods with reduced and full rotor loads are compared to an integrated simulation. The accuracy of decoupled methods is evaluated and an optimization is performed to obtain aerodynamic damping ratios for different wind speeds that provide the best results with respect to variance and equivalent fatigue loads at distinct output locations. Results show that aerodynamic damping is not linear, but that it is possible to match desired output using decoupled models. Moreover, damping ratios obtained from the empirical study suggest that aerodynamic damping increases for higher wind speeds.
Assessment of Bird Species in Central Mindanao University, Bukidnon, Philippines
Authors: Alviola Geonyzl Lepiten , Mohagan Alma B
Published: July 2017

Birds are important indicators to determine the quality of habitat. They played an important role in maintaining the balance of our ecosystem. This study aims to determine the species of birds and its diversity within the Central Mindanao University main campus. A line transect method combined with bird watching technique were used within the two month avian survey. A  total  of  27 species belonging to 21  families were  recorded namely, Accipitridae, Alcedinidae, Apodidae, Ardeidae, Artamidae, Bucesotidae, Campephagidae, Columbidae, Corvidae, Dicaeidae, Estrildidae, Hirundiniidae, Laniidae, Meropidae, Nectariniidae, Phasianidae, Pycnonotidae, Sturnidae and Sylviidae. Out of the 27 bird species observed, 18 resident, 3 resident-migrant, 5 Philippine endemic and 1 island endemic. The most observed species are Euarasian Tree Sparrow (Passer montanus) and followed by an introduced species which was Feral Pigeon (Columba livia). Most of the species observed were commonly found in urban communities, agroecosystem and along the forest edge. Some species of birds belonging to family Nictariniidae and Dicaeidae are associated in areas with flowering trees and there are seldom observed in other points. The average diversity of all points H’= 0.94 which is quiet low and it requires more sampling effort and other technique to record silent or shy species.
The Importance of Knowledge about the Preschool Curriculum in Terms of Preschool Administrators’ Instructional Leadership Practices
Authors: ŞAHİN Sevilay , SEZER Gülşen
Published: July 2017

The purpose of the present study was to unearth the importance of school administrators’ knowledge about thepreschool curriculum in terms of displaying instructional leadership behaviors in the kindergartens and primary schools with preschool classes. The study group in the research consisted of 20 preschool teachers and 10 preschool administrators working in the schools tied to the Ministry of National Education in Kilis province, chosen via the purposeful sampling technique. Interviews were conducted with the participants to collect the data. The data were then content-analyzed. The results revealed that primary school administrators did not have adequate knowledge about the preschool curriculum and could not display instructional leadership behaviors; however, preschool administrators had, comparatively, adequate knowledge about the curriculum and were more successful in terms of displaying instructional leadership behaviors. Drawing on this point, it may be suggested that knowledge about the preschool curriculum is of utmost importance in preschool administrators’ instructional leadership practices.
Making and Receiving: Possibilities for Middle School General Music
Authors: Cronenberg Stephanie
Published: July 2017

For many music teachers faced with developing a middle school general music class, the possibilities for both musical content and pedagogical implementation may seem endless. The experiences and preparation of teachers who teach this class and the students who enroll necessarily impact the teaching and learning that occurs; yet, many teachers have complete autonomy when developing this learning experience. Through lived and told narratives of experience, this article explores the perspectives and teaching practices of two music teachers who conceptualize musical learning in middle school general music differently. Utilizing a dialectic perspective, the views of these two teachers are placed in dialogue each other and with the practices of the researcher in order to examine an important issue in music education: making and receiving or developing artistic performance skills and aesthetic perception abilities. The discussion of these two teachers’ practices demonstrates the need for continued and ongoing discussion between music educators with differing views, a dialogue with potential to strengthen the purposes and content of general music for middle school students.
Attica Means Fight Back: History and Storytelling as Resistance
Authors: McGuire Danielle L.
Published: July 2017

In his presidential address for the 2012 American Historical Association, Bill Cronon argued that the core business of historians is “resurrection.” Our job, he said, is to breathe life into the “dead past” and make it live again. There is no worse crime, he said, “than to make it forgettable.” Heather Ann Thompson’s brilliant and beautifully rendered book Blood in the Water: The Attica Prison Uprising and Its Legacy offers us, among other things, a blueprint of how to write powerful narrative nonfiction with explanatory force that brings the past to life and does real work in the present.
Mining Mind and Body: Approaches and Considerations for Using Topic Modeling to Identify Discourses in Digitized Publications
Authors: Regan Amanda
Published: July 2017

Historians in the twenty-first century are faced with an abundance of digitized material. Large-scale scanning efforts have made millions of textual primary sources available to historians at the click of a mouse. This paper discusses using topic modeling, a probability algorithm, to extract themes and discourses in large corpuses of digitized text. Mind and Body, a monthly publication about physical education, which ran from 1894 until 1936, was often at the very center of developments in the field of physical education. Major developments such as professionalization; the battle between the American, German, and Swedish exercise systems; and shifts in ideas about the role of exercise in American life were discussed and debated within the pages of Mind and Body. Applying distant-reading methodologies to such a central text aids scholars in identifying themes, discourses, and points for further examination.
Tweet Out? Twitter, Archived Data, and the Social Memory of Out LGBT Athletes
Authors: Osmond Gary
Published: July 2017

The allure of Twitter data for historical analysis is heady. The volume of tweeted posts since the microblogging service was launched in 2006 represents a wealth of recent historical data as well as a deep pool of social memory offering insight into how the past circulates in the present. This article considers the promise, possibilities, and problems of accessing and analyzing Twitter data. To help illuminate the broader issues of method and methodology, a case study is used: the social memory on Twitter of the prominent Australian LGBT athlete Ian Roberts, who came out as gay in 1995, especially the ways he is evoked when other athletes come out. Via this selective emphasis, this article questions the viability for sport historians to investigate Twitter data.
Reviewer Acknowledgements for English Language Teaching, Vol. 10, No. 8
Authors: Yu Gavin
Published: July 2017

Reviewer acknowledgements for English Language Teaching, Vol. 10, No. 8, 2017
An Investigation of Learning Style Preferences on the Students’ Academic Achievements of English
Authors: Al-Zayed Norma Nawaf Yousef
Published: July 2017

This study aims to investigate whether there are any statistically significant correlation between perceptual learning styles and achievement. Raising learners’ awareness regarding their learning styles and preferences, which develops the better understanding of the learning achievement, and help instructors become more conscious of some factors affecting academic achievement. Additionally, the study assists instructors to identify their student’s preferred learning styles that can affect their achievement. Furthermore, no study up to now has been conducted in Jordan which investigates the relationship between the learning styles on the achievement of EFL at the tertiary level. The data was collected through the learning style preferences questionnaire and it was analyzed using statistical techniques, Descriptive statistics showed that: 1). The most preferred learning styles followed the auditory style, group learning style, kinesthetic style and visual style. 2). The finding also revealed that there was no statistically significant correlation between learning style and achievement. Additionally, both showed similar references for kinesthetic and visual styles. Based on these findings, some recommendations have been made.
The Impact of Shadowing Technique on Tertiary EFL Learners’ Listening Skill Achievements
Authors: Sumarsih Sumarsih
Published: July 2017

This paper is aimed at describing the impact of Shadowing Technique on students’ listening skills achievement. Therefore, the experimental research was conducted and the techniques on collecting the data were administrating pre- and post- tests to the experiment and control groups, which consisted of 30 university students in each group. Then, t-test and ANCOVA were applied on analyzing the data, then to find the impact of shadowing technique on EFL learners’ listening skill achievements in English Department of Universitas Negeri Medan (UNIMED), Indonesia. As a result, there was a significant difference between the mean of experimental and control groups (F = 8.98, p=. 004 < .05). In addition, there was a significant effect of applying shadowing technique on students’ listening skill achievements (F=56.10, p=0.00<0.05) and the experimental group grammatically outperformed the control group. In conclusion, the null hypothesis was rejected and the alternative hypothesis was accepted.
The L2 Motivational Self System and Religious Interest among Saudi Military Cadets: A Structural Equation Modelling Approach
Authors: Alqahtani Ali Falah
Published: July 2017

This study surveyed the English language learning motivation of 384 Saudi military cadets. The researcher applied structural equation modelling to analyse how a set of motivational factors interact in shaping the motivation to learn English of this under-researched context. The study found that the language learning effort was determined by the students’ attitudes towards the language learning process as well as their Ought-to L2 Self. However, the Ideal L2 Self contributed to the language learning effort indirectly with the mediation of the students’ attitudes towards the language learning. The influence of the students’ parents was salient as the parental encouragement contributed to the students’ Ought-to L2 self as well as their language learning attitudes. Finally, the students’ perception of the benefit of learning English for religious purposes (religious interest) contributed to the enjoyment derived from the process of language learning, which in turn impact the effort they invest in their language learning.
Reviewer Acknowledgements for Journal of Mathematics Research, Vol. 9, No. 4
Authors: Wang Sophia
Published: July 2017

Journal of Mathematics Research wishes to acknowledge the following individuals for their assistance with peer review of manuscripts for this issue. Their help and contributions in maintaining the quality of the journal is greatly appreciated.Many authors, regardless of whether Journal of Mathematics Research publishes their work, appreciate the helpful feedback provided by the reviewers.Reviewers for Volume 9, Number 4Abdelaziz Mennouni, University of Bordj Bou-Arreridj, AlgeriaArman Aghili, University of Guilan, IranCecilia Rosa, Instituto Politecnico da Guarda, PortugalCinzia Bisi, Ferrara University, ItalyKong Liang, University of Illinois at Springfield, USAKuldeep Narain Mathur, University Utara Malaysia, MalaysiaMarek Brabec, Academy of Sciences of the Czech Republic, Czech RepublicMohammad Sajid, Qassim University, Saudi ArabiaOmur Deveci, Kafkas University, TurkeyPhilip Philipoff, Bulgarian Academy of Sciences, BulgariaRami Ahmad El-Nabulsi, Athens Institute for Education and Research, GreeceRussell John Higgs, University College Dublin, IrelandSanjib Kumar Datta, University of Kalyani, IndiaSergiy Koshkin, University of Houston Downtown, USASreedhara Rao Gunakala, The University of The West Indies, Trinidad and TobagoVishnu Narayan Mishra, Sardar Vallabhbhai National Institute of Technology, IndiaZoubir Dahmani, University of Mostaganem, Algeria  Sophia WangOn behalf of,The Editorial Board of Journal of Mathematics ResearchCanadian Center of Science and Education
Clinical Evaluation of the Use of Mini-Implants to Replace Congenitally Absent Maxillary Lateral Incisors: A Short-Term Study
Authors: Alharissy Muhammad , Dayoub Suleiman
Published: July 2017

Aim: The aim of this study was to evaluate the treatment outcome of immediately restored mini-implants with a diameter of 2.5 mm one year after their use for rehabilitation of congenitally absent maxillary lateral incisors.

Methodology: A total of 30 mini-implants (narrow ridge 2.5) were inserted in 23 patients (13 females, 10 males) with a mean age of 21.6 years (range: 16–38 years) at the implant center of Damascus University. The implants replaced congenitally absent maxillary lateral incisors. All implants were immediately restored with a non-functional provisional acrylic crown. The abutment part of the implant was prepared before crown cementation. The ceramic permanent crown was placed after three months. A health implant scale was chosen to evaluate implant success. A periapical standard X-ray was taken immediately upon bonding of the temporary crown as well as after one year of loading. Proximate bone loss was measured using Canvas 9 (ACD, 2004).

Results: No implant was lost; thus, the one-year implant survival was 100%. Optimal survival was 93.6%. A statistically significant mean marginal bone loss was observed between baseline and 12 months (mesial: 1.06 ± 0.55 mm; distal: 1.05 ± 0.53 mm).

Conclusion: A high one-year survival rate was documented for management of congenital missing maxillary lateral incisors using immediately loaded mini-implants, and these implants therefore provide a good alternative treatment option.

How to cite this article: Alharissy M, Dayoub S. Clinical Evaluation of the Use of Mini-Implants to Replace Congenitally Absent Maxillary Lateral Incisors: A Short-Term Study. Int Dent Res 2012;2:27-32.

Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.