bluuebunny/crossref_metadata_2025 huggingface dataset:
Statistical Stellar Mass Corrections for High-z Galaxies Observed with JWST Broadband Filters Due to Template Degeneracies
Authors: Bisigello L. , Caputi K. I. , Colina L. , Pérez-González P. G. , Koekemoer A. , Le Fèvre O. , Grogin N. , Nørgaard-Nielsen H. U. , van der Werf P.
Published: August 2019

Stellar masses in future James Webb Space Telescope (JWST) deep blank fields will be mainly derived by fitting the spectral energy distribution (SED) with theoretical galaxy templates. We investigate the uncertainties and biases of the stellar masses derived by using the LePhare code for SED fitting and the Yggdrasil theoretical templates. We consider a sample of mock galaxies at z = 7–10 with mock JWST observations with S/NF150W ≥ 10. Our goal is to provide a list of statistical stellar mass corrections to include on the stellar mass derivation for different output galaxy properties and JWST filter combinations to correct for template degeneracies. Median statistical stellar mass corrections vary from −0.83 to 0.87 dex, while 25% (75%) quartiles range from −0.83 (−0.67) to 0.51 (0.88) dex, depending on filter combinations and galaxy models. The most challenging cases are galaxies with nebular emission lines, especially the ones that are wrongly identified as galaxies without, relative dust-free galaxies, and galaxies with small metallicities (i.e., Z = 1/50 Z
⊙). The stellar mass estimation of galaxies correctly identified without emission lines is generally fine, except at z = 10 when considering only the eight NIRCam bands, which make the MIRI bands very valuable. We have tested our stellar mass corrections using the public JAGUAR galaxy catalog, deriving that the average discrepancy in the recovered stellar mass distribution decreases by 20%–50% at z > 7 after the correction. We found that without the stellar mass corrections, the number of low-mass galaxies (M* < 107
M
⊙) is overestimated, which can potentially lead to systematic errors in the calculation of the galaxy stellar mass function faint-end slope at high z.
WFIRST and EUCLID: Enabling the Microlensing Parallax Measurement from Space
Authors: Bachelet Etienne , Penny Matthew
Published: August 2019

The Wide Field Infrared Survey Telescope (WFIRST) is expected to detect hundreds of free-floating planets, but it will not be able to measure their masses. However, simultaneous microlensing observations by both Euclid and WFIRST, separated by ∼100,000 km in orbits around the Sun–Earth L2 Lagrange point, will enable measurements of microlensing parallax for low-mass lenses such as free-floating planets. Using simple Fisher matrix estimates of the parallax measurement uncertainties, we show that high-cadence observations by Euclid could be used to measure ∼1 free-floating planet microlens parallax per 6 days of simultaneous Euclid observations. Accounting for Euclid’s pointing constraints, it could therefore potentially measure ∼20 free-floating planet parallaxes, with 120 days of observations split equally between Euclid’s main mission and an extended mission, with the potential to increase this number if spacecraft pointing constraints can be relaxed after the end of the main mission. These Euclid observations would also provide additional mass measurements or cross-checks for larger numbers of WFIRST’s bound planets, among other benefits to several science cases.
Systematics of Huicundomantis, a new subgenus of Pristimantis (Anura, Strabomantidae) with extraordinary cryptic diversity and eleven new species
Authors: Páez Nadia B. , Ron Santiago R.
Published: August 2019

Pristimantis is the most diverse genus of tetrapods comprising 532 described species. It contains a large number of morphologically cryptic species that are being discovered with the assistance of genetic evidence. We use molecular, morphological, bioacoustic, and environmental data to assess the phylogenetic relationships and determine the species within an Andean clade of Pristimantis, which is distributed from central Ecuador to northern Peru. We assign to this clade the name Huicundomantis and propose it as a subgenus. Our results show that Huicundomantis is composed of two large clades which we name as the P.phoxocephalus species group and the P.cryptomelas species group. Huicundomantis is composed of 28 species of which 12 have been described and 16 are new. We describe 11 of these undescribed species. The most effective characters to discriminate among species are DNA sequences, qualitative morphology, and advertisement calls. Morphometric and environmental characters are not very useful to define species limits. We clarify the identity of P.riveti and show that populations from southern Ecuador traditionally ascribed to P.riveti are a new species, P.lutzaesp. nov. We also show that P.prometeii is a junior synonym of P.hampatusami. The current diversity and geographic distribution of Huicundomantis are consistent with a model of allopatric speciation. All species have a restricted distribution range (less than 4330 km2) and are assigned to the Red List categories Data Deficient or threatened with extinction. We provide new reasons to increase conservation efforts for these species and their habitat. Taking our results into account, Pristimantis species richness in Ecuador increases from 211 to 221 species, and the number of species endemic to Ecuador from 119 to 129.
Rheumatoid Arthritis Initiating as Palindromic Rheumatism: A Distinct Clinical Phenotype?
Authors: Castellanos-Moreira Raul , Rodriguez-Garcia Sebastian C. , Gómez-Puerta José A. , Ruiz-Esquide Virginia , Camacho Oscar , Ramírez Julio , Cuervo Andrea , Morlà Rosa , Cañete Juan D. , Haro Isabel , Sanmarti Raimon
Published: August 2019

Objective.

To analyze the prevalence of preexisting palindromic rheumatism (PR) in patients with established rheumatoid arthritis (RA) and to evaluate whether these patients have a distinctive clinical and serological phenotype.

Methods.

Cross-sectional study in patients with established RA. Preexisting PR was determined using a structured protocol and confirmed by retrospective review of medical records. Demographic, clinical, radiological, immunological, and therapeutic features were compared in patients with and without PR.

Results.

Included were 158 patients with established RA (78% female) with a mean disease duration since RA onset of 5.1 ± 2.7 years. Preexisting PR was recorded in 29 patients (18%). The median time from the onset of PR to progression to RA was 1.2 years. No between-group differences in demographic features, current disease activity, radiographic erosive disease, or disability were observed. Patients with PR had a higher prevalence of smoking (72% vs 40%). Positive rheumatoid factor, anticitrullinated peptide antibodies, and anticarbamylated protein antibodies were numerically higher in patients with PR. No differences in treatment were observed except for greater hydroxychloroquine (HCQ) use in patients with PR (38% vs 6%). Palindromic flares persisted in a significant proportion of patients during the RA course, including patients in clinical remission or receiving biological disease-modifying antirheumatic drugs.

Conclusion.

Eighteen percent of patients with RA had a history compatible with PR previous to RA onset. No specific clinical or serological phenotype was identified in these patients, although higher HCQ use and smoking prevalence were identified. Palindromic flares may persist during the RA disease course despite treatment.
Frère ou sœur d’un enfant en difficulté
Authors: Denis Yvette , Menjon Sylvie
Published: August 2019

Le groupe « fratrie » est un lieu de parole, d’écoute et d’échange. Créé entre des soignants de pédopsychiatrie Ouest et du cmpp de l’Association angevine de parents d’enfants inadaptés, il s’ouvre à des enfants dont les frères et sœurs sont suivis dans ces deux espaces. L’admission dans le groupe et les modalités d’animation de ce groupe de parole permettent aux enfants et jeunes d’y aborder un quotidien difficile en lien avec le handicap ou la maladie, ainsi que des sentiments et des éprouvés vis-à‑vis de leur situation.
Une école d’éducateurs
Authors: Besse Monique
Published: August 2019

Un retour sur l’histoire d’une école d’éducateurs des ceméa , de Vaugrigneuse à Aubervilliers, sur les idées qui l’ont animée et en ont fait une institution vivante, un lieu de formation reposant sur le partage des savoirs dont chacun était supposé a priori être porteur, quels que soient leur origine et leur nature : il s’agissait alors de trouver les dispositifs – lieux d’échange et de décision – favorisant ce partage. Cette expérience de formation, en plus de la transmission des savoirs, avait pour but d’éclairer et d’orienter l’exercice du métier d’éducateur spécialisé.
La confiance : une référence à la pédagogie active et à la psychanalyse
Authors: Egry Marie-Claude , Sabardeil Michèle
Published: August 2019

Cet article développe le lien entre la pédagogie avec les adultes en formation et celle avec les jeunes enfants, pratiquée au cerpe autour de deux axes : la pédagogie active et la psychanalyse. La confiance y est située comme la condition d’une éthique, au sens de Levinas : accueil de l’autre dans la pluralité des visages, des cultures et des âges. C’est à partir de la continuité de l’expérience éprouvée de l’accueil que se construit la pratique de l’accueil auprès du public. Cette pédagogie de la confiance pourrait se définir comme la conviction que tout un chacun peut évoluer selon son propre rythme à condition de tout mettre en œuvre pour permettre cette évolution. La confiance accordée dans les compétences de chacun est un des grands principes de cette pédagogie : c’est aussi le moteur quotidien qui anime notre rapport à l’autre.
Un groupe d’entraide mutuelle : témoignage d’un parcours dans une institution qui vous réapprend à vivre
Authors: Djadda Ahmed
Published: August 2019

Ce récit est le témoignage d’un adhérent du gem L’Étoile polaire (à Paris), en situation d’isolement, avec une sévère pathologie psychiatrique. Dans sa quête de socialisation et de stabilisation de sa maladie, il mène le parcours du combattant pour la reconnaissance de son handicap et de son statut de citoyen comme les autres. Au sein de ce gem , il apprend à être autonome et à avoir le pouvoir d’agir. C’est le chemin vers la réhabilitation et le rétablissement. Sa fréquentation de cette structure associative non médicalisée lui fait découvrir une vraie institution vivante centrée sur l’humain et la reconnaissance de sa condition. Son implication et son combat le mèneront de simple adhérent à devenir responsable d’atelier, puis à intégrer la direction de l’association, ce qui lui permet d’être recruté par la suite comme coordinateur-animateur et ainsi d’atteindre une insertion professionnelle et sociale.
Vivre le don ou donner le vivant
Authors: Lallemand Damien
Published: August 2019

Lors d’un temps de repas, au sein d’une cantine scolaire, je tente de faire apparaître comment un acte aussi simple que celui de donner à manger peut recouvrir un rapport de mort. Lorsqu’une institution n’est pas assise sur des principes, vivifiant chaque présence à autrui, le moindre geste peut anéantir tout lien engagé, voire chaque singularité. Quand la propriété résonne au travers du don, c’est la voie royale engagée vers une ségrégation.
« Triangulez, triangulez ! »
Authors: Pendanx Daniel
Published: August 2019

En quoi la vie institutionnelle, le mode de direction et l’orientation des pratiques se trouvent-ils noués à la façon dont établissements et services sont institués ? Qu’en est-il du rapport des institutions à la subjectivité ? Ce texte, insistant sur l’exigence des limites et de la triangulation, vise à partir d’un cas à faire miroiter cet ordre du désir inconscient et de la relation duelle en regard duquel opère l’effet-tiers, civilisateur des passions primitives, des institutions.
Vers des institutions du travail social postlibérales ?
Authors: Ferrand Laure
Published: August 2019

L’article met en lumière les résultats d’une recherche réalisée entre 2017 et 2018 par le P3R Centre-Val de Loire. À partir de ces résultats, il s’agit de prolonger la réflexion autour des enjeux de la vie institutionnelle du travail social. Un regard critique est porté sur les effets des logiques néolibérales à l’œuvre dans l’action sociale et sur les perspectives de sortie d’organisations devenues contre-productives.
The Moderation Examination of ICT Use on the Association Between Chinese Mainland Students’ Socioeconomic Status and Reading Achievement
Authors: Xiao Ya , Hu Jie
Published: August 2019

This study explores the moderation effect of the information and communication technology (ICT) on the association between students’ socioeconomic status and their reading achievement. In total, 9,596 samples of 15 years old from 268 schools in mainland China are drawn from the latest wave of the public database -- Program for International Student Assessment (PISA) 2015. This study applies the moderation model in multiple regression analysis to respectively analyze the moderation effect of 2 composite variables of students’ ICT use, i.e., ICT use for schoolwork and ICT use for leisure. Two significant results are reported: (1) stu-dents’ ICT use for schoolwork or for leisure can moderate the relationship be-tween their socioeconomic status and their reading achievement; (2) the high-level ICT use for schoolwork or for leisure may narrow the gap in students’ reading achievement caused by different socioeconomic status deduced from the buffer-ing moderation effect of the moderating variables. These findings might provide insights to future studies in educational equality promotion, infrastructure con-struction and pedagogy improvement in reading education.
Game-Based Multimedia for Horizontal Numeracy Learning
Authors: Rohendi Dedi
Published: August 2019

Recently, game-based multimedia development has been increasing rapidly. Game-based multimedia is not only used for entertaining but also for teaching and learning process. Meanwhile, for the majority of elementary school students, numeracy learning is still considered as a difficult subject to be learned and has not attracted students’ interest because it still uses vertical methods. The objective of this research is to examine the implementation of game-based multimedia in learning horizontal numeracy. In this game-based multimedia, horizontal numeracy material is presented in the form of a game. Horizontal numeracy material begins with addition, subtraction, multiplication, and division. Game-based multimedia is implemented to 20 students in grade 3 elementary schools in Bandung, Indonesia. Subsequently, the way students learn the materials and their learning outcomes are explored after using this multimedia. The results show that the students can learn horizontal numeracy excitingly; moreover, they can easily understand the concept of horizontal numeracy quickly. It is indicated by by the increasing of average post-test value.
College Students' Law Education Platform Based on Browser/Server and Massive Open Online Courses
Authors: Yang Xue , Song Zhen
Published: August 2019

It is compulsory for us to strength the students’ law education in China in order to develop their overall qualities. It is also what we need to build a harmonious society. Along with the steady advancement of society, the surge of information technologies has contributed to the integration of various new teaching methods, models and platforms into the law education. This paper, based on the browser/server (B/S) architecture and the concept of Massive Open Online Courses (MOOCs), attempt s to profoundly analyze relevant situation of students' law education in universities. According to the findings, it is found that the teaching of MOOCs in China is evolving at full speed. User groups show different preferences for the disciplines since they have a great demand for vocational skills and undergraduate education. In China, there are some gaps in the law education in universities, for example, the teaching and evaluation methods look like relatively single, there is lack of pedagogical practices, teachers' pedagogies remain to be improved, and students' enthusiasm of legal education is low. The curriculum refinement and the mobile clients developed intensively constantly improve the design of the law education platform for students in universities. The study is beneficial to the construction of law education platform for students in universities in China.
Validade de conteúdo, confiabilidade e validade de construto de um checklist para avaliação do rolamento “peixe”
Authors: Costa Rafaela Zortéa Fernandes , Spinosa Rodrigo Martins de Oliveira , De Santo Dalberto Luiz , Medina-Papst Josiane , Marques Inara
Published: August 2019

O objetivo deste estudo foi verificar a validade de conteúdo, a confiabilidade e a validade de construto de um checklist para avaliação do Rolamento Peixe. Em relação à validade de conteúdo, 4 especialistas na área da Ginástica Artística avaliaram o checklist utilizando-se da técnica Delphi. Os resultados demonstraram bons índices de validade de conteúdo para as questões avaliadas (IVC>0,80). Sobre a confiabilidade, seis avaliadores, analisaram 20 vídeos do rolamento peixe de 10 crianças, utilizando-se do checklist. Os resultados demonstraram concordância intra (ICC>0,80) e inter avaliadores (ICC>0,90). Por fim, para a validade de construto, 156 vídeos da habilidade foram analisados utilizando o checklist. Foram aplicados os testes Alfa de Cronbach e Análise Fatorial Exploratória com rotação Varimax, a qual indicou boa consistência interna (α=0,76) e a existência de três fatores que explicam o checklist. Desta forma, conclui-se que o checklist é válido e confiável para a avaliação da habilidade motora proposta.
Validade diagnóstica do questionário de triagem do American College of Sports Medicine/American Heart Association
Authors: Maranhao Neto Geraldo Albuquerque , Santos Tony Meireles , Pedreiro Rodrigo Cunha de Mello , Carmo Hugo Andrade , Jardim Raiane , De Lorenzo Andrea
Published: August 2019

A prevenção de eventos cardiovasculares é um dos principais objetivos de um questionário de triagem para a prática de exercícios. O objetivo do estudo foi verificar a validade diagnóstica do questionário do ACSM/AHA (AAPQ), analisando a sensibilidade (SE) e especificidade (ES), e posteriormente a AUC (área sob a curva). Participaram do estudo 69 indivíduos (40 a 81 anos). Comparações entre sexo e categorias de idade foram realizadas. Não foi verificada diferença significativa entre sexos ou diferentes categorias etárias. Contudo, a variação nas respostas positivas pareceu aumentar percentualmente, principalmente a partir dos 60 anos (de 78,6% a 100%). Os valores de SE do AAPQ foram altos (88,2%), sugerindo que grande parte dos indivíduos em que o resultado do instrumento foi positivo, realmente apresentava alguma contraindicação. Contudo, o valor da ES foi de apenas 13,5%, apontando falha em identificar corretamente aqueles indivíduos sem contraindicação ao início de um programa de exercícios. Com isso, o instrumento teria uma baixa capacidade diagnóstica (AUC=0,51). Os resultados sugerem que o questionário apresenta baixa capacidade em identificar indivíduos aptos a iniciar um programa de exercícios, evidenciada principalmente pela sua baixa ES.
Fatores associados à prática de atividade física entre professores do nível básico de ensino
Authors: Veloso Silva Rosângela Ramos , Moreira Alexandra Dias , Magalhães Tatiana Almeida , Vieira Marta Raquel Mendes , Haikal Desirée Sant’Ana
Published: August 2019

O objetivo desse estudo foi avaliar os fatores associados ao nível de atividade física (AF) em professores de Montes Claros. Estudo realizado em 2016 com 760 professores de 35 escolas da Educação Básica de ensino. Foram avaliadas características sociodemográficas; Morbidades, Medidas antropométricas; Questões subjetivas em saúde; Comportamentos e hábitos. Para avaliação do nível de AF utilizou-se o Questionário Internacional de Atividade Física , versão curta. Realizou-se regressão logística para estimar a associação entre exposições e prática suficiente de AF (nível de significância 5%). A chance de ser suficientemente ativo foi maior entre os solteiros e divorciados (OR: 1,47; IC95%:1,01–2,13 e OR:1,82; IC95%:1,08 -3,06, respectivamente); com domínio psicológico e social da qualidade de vida insatisfatório (OR:1,55;IC95% 1,04 - 2,31 e OR:146; IC95% 1,01-2,13, respectivamente) e foi menor entre as pessoas de classe social B, (OR:0,50;IC95%: 0,30 – 0,85), com autopercepção regular da saúde (OR:0,55; IC95%0,38–0,80) e com alfabetização insatisfatória em saúde (OR: 0,62; IC95%: 0,45-0,87). Na amostra foi encontrada baixa frequência de AF suficiente. O estado civil, a qualidade de vida, a autopercepção de saúde e a alfabetização em saúde foram fatores associados à prevalência de AF entre os professores.
Barriers to implementation of "Academia da saúde program" in Santa Catarina
Authors: Paiva Neto Francisco Timbó de , Mazo Giovana Zarpellon , Sandreschi Paula Fabrício , Petreça Daniel Rogério , Rech Cassiano Ricardo
Published: August 2019

The Ministry of Health established the Academia da Saúde Program (PAS) with the objective of contributing to the promotion of health, the implementation of policies for the conduct of physical activities, physical activity and leisure and the reduction of healthy lifestyles. The objective of this study was to identify managers of physical activity programs on the barriers to the operation of the PAS poles in Santa Catarina (SC). A cross-sectional study was carried out with 26 managers (61.5% women) of physical activity programs in Santa Catarina. As compensation payments were withdrawn from the base for updating health statistics. Descriptive statistics (mean, standard avoidance, absolute and relative frequency) were made for data analysis. The results triggered a lack of human resources, lack of leadership, lack of materials, facilities, equipment and a lack of standardized instruments to carry out an evaluation of actions. It was concluded that organizational, infrastructure and human resources barriers are present in the day-to-day actions of PAS in SC.
Effect of the Deformation and Heat Treatment on the Microstructural Evolution and Mechanical Properties of Mg-4%Y Alloy
Authors: Wang Hong Xin , Zhang Peng , Liu Jian Shu
Published: August 2019

This study aimed to evaluate the effects of extrusion process and subsequentheat-treatment on microstructural evolution and mechanical properties of Mg-4%Y alloy. Theresults showed that the dynamic recrystallization occurred during extrusion, the microstructure istiny equiaxial grains, the shearing stripes and parallel streamlines which distribute along theextrusion direction are especially obvious. The tensile curve has obvious yield phenomenon. Afterannealing, parallel streamlines disappear, the yield phenomenon of tensile curve eliminates, theyield strength(σ0.2) and the tensile strength(σb) decrease, the plasticity increases. The underneathmechanism for mechanical properties can be ascribed to the weak pining effect of second-phaseparticles on the movement of dislocation and release of the pile-up dislocations.
Control of Properties of Composite Materials - Quality Functional
Authors: Garkina Irina , Danilov Alexander
Published: August 2019

Methodological principles for the development of composite materials with the desiredstructure and properties are proposed. One of the perspective directions of development ofcomposite materials by their representation as multi-purpose systems with the corresponding systemattributes is considered. The structure of quality functional for objective assessment of quality ofkinetic processes of formation of physic-mechanical characteristics of a composite is developed.The technique of synthesis of construction material based on application of lines of equal level ofquality functional is offered.
Adsorption and Desorption Study of Locally Available BOF Sludge to Remove Metal Ions from Aqueous Solutions
Authors: Rozumová Lucia
Published: August 2019

Coarse BOF sludge is a waste originating from steelmaking production. The major phaseof this waste is zinc ferrite. BOF sludge for this study was obtained from the metallurgical industryfrom a process of gas treatment in an oxygen converter. The sorption of cobalt, manganese and nickelions was investigated in the sample of the deposited sludge in a batch of experiments. The sorptionprocess was evaluated using three types of isotherm models. The sludge sample was alkaline andconsisted primarily of X-ray amorphous compounds and crystalline Fe oxides. The adsorptionprocess showed that a high removal efficiency was achieved at a lower initial concentration of metalions. Moreover, the equilibrium of the sorption process was achieved after 72 hours. Subsequently,the desorption of these adsorbed ions was investigated. The results of this study indicate that theapplication of metallurgical waste as a sorbent is highly effective for the treatment of wastewater.
Dehydration and Sieving to 150 Microns Process of Melon Seed
Authors: Hernández Imelda Loera , Espinosa-Garza Gerardo
Published: August 2019

Melon is one of the main horticultural products that are harvested in Mexico and is a sourceof employment and an important income for farmers in the country. Melon is in great demand in thejuice and pulp industry and nowadays it is a current task to develop technologies for the use ofprocessed seeds from melons. The objective of the present investigation is to determine the yield of15 minerals and the composition of fatty acids present in melon seeds in order to add value to thisresidue. Some polyphenols were also determined in order to verify their possible intake to reducecertain health problems. Allergies and lactose intolerances have increased in recent years andtherefore there has been a growing demand for alternatives. By taking advantage of the melon seeds,we sought to create a drink made of melon seeds as a substitute for milk. After performing severalexperiments in the lab, it was demonstrated that melon seeds contain high amounts of linoleic acid, asubstance that regulates hormone production, improves neuronal function, strengthens the immunesystem and reduces cholesterol, thus preventing certain cardiac problems.
Investigation of the Possibilities to Obtain Integral Sandwich Constructions
Authors: Protsenko Alexander E. , Petrov Victor V. , Malysheva Daria P. , Gnatik Alina O.
Published: August 2019

Present paper shows the possibility of obtaining complex planar integral sandwichconstructions for one technological transition The technology of obtaining integrated sandwichconstructions is described. The data of flexural strength tests of the samples obtained by the methodof VaRTM and hand lay-up molding are presented. It has been established that samples obtained bythe VaRTM method are 13% stronger. The obtained data are also confirmed by microscopicresearch. Fiberglass of integral sandwich constructions made by hand lay-up molding ischaracterized by significant porosity.
Fracturing Proppant Evaluation and Economic Optimization in Daqing Oilfield
Authors: Yang Jiao
Published: August 2019

Fracturing proppant is an important material for hydraulic fracturing, and its performancehas an important impact on the fracturing effect and the fracturing life of oil and gas wells. On thepremise of satisfying the reservoir reconstruction requirement, optimizing the proppant with the besteconomic benefit can reduce the cost of the fracturing operation. The flow conductivity and brokenrate of common proppants are tested to obtain the performance boundaries. Based on the proppantevaluation, according to the selection method, the optimal proppant type for different formationpressures can be selected to maximize economic benefits.
Impact of Heavy Oil Sewage Components on the Performance of Coagulated Particles
Authors: Yang Bo , Zhang Jian , Huang Xue Fei , Yu Tao , Qu Cheng Tun
Published: August 2019

In this paper, the relationship between the components of heavy oil wastewater and thesurface wettability of coagulation particles were studied. The effects of cations (Ca2+, Mg2+, Fe2+,Fe3+), oil content and pH on wettability of coagulated particles surface in heavy oil wastewater werestudied by measuring the contact Angle, and the possible mechanism was discussed. It was foundthat the contact Angle decreased with the increase of pH value. The change of oil content isnegatively correlated with the contact Angle. Surface wettability of coagulated particles arecorrelated with cationic concentration in sewage and standard electrode potential. When cationicconcentration is less than 500 mg/L, surface wettability is positively correlated with standardelectrode potential. When cationic concentration is more than 1000 mg/L, surface wettability ismainly related to the total amount of cationic ions in sewage.
Properties of Films Prepared as Packaging Plastics from Blends of Synthetic Polymer and Biopolymer
Authors: Beleška Kęstutis , Valeika Virgilijus , Jankauskaite Virginija , Valeikiene Violeta
Published: August 2019

Natural biopolymers were studied for their possible role as biodegradable fillers forlow-density polyethylene (LDPE) films. LDPE/biopolymer blends and films were prepared andcharacterized by the melt flow index (MFI) and tensile test. The addition of biopolymer to LDPEreduced the MFI values, the tensile strength and modulus, whereas the elongation at break increased.Interfacial interaction was better for LDPE/biopolymer blends containing soybean oil. Blendsprepared with oil showed the same behaviour as LDPE/biopolymer blends, indicating thatbiopolymer was the main factor that influenced the properties of blend.
Composite Plugging Removal Technology and Application in Low Permeability Oilfield
Authors: Deng Qiang , Liu Man , Lu Xiao , Meng Xuan Gang , Li Jin Ling , Chen Shi Jun , Chen Gang
Published: August 2019

In an oilfield factory, the blocking and jam in Chang 2 reservoir is very serious. In recentyears, according to analysizing different plugging mechanism and optimizing acidizing formula, theoptimal plugging removal technology was formed suitable for the solution for the Chang 2 reservoirof oilfield factory. This plugging removal formula increases the efficiency radius, and increases thedosage of additives to protect the pipe, rod and pump from the precipitation such as Ca2+and Mg2+,which causes new pollution. Reasonable multiple technologies were designed, and low displacementmethod was used in the injection process, aiming at the characteristics of Chang 2 reservoir. Thismethod extends the time of plugging removal fluid staying around the well bore, which can eliminateplugging near well bore area effectively, and improve the permeability. DQ-1 composite pluggingremoval and other kinds of plugging removal methods have been used more than 50 times, and theeffect is remarkable, which made a positive contribution to stable production of the oilfield.
Recent Experiences of Helicopter Main Rotor Blade Damage
Authors: Weber Simone , Lone Mudassir , Cooke Alastair
Published: August 2019

Results of a survey investigating commonly occurring minor rotor blade damage incidents are presented in this paper. Over 100 participants worldwide ranging from test pilots to commercial pilots and licensed engineers answered the survey. The focus of this work was to provide a user-oriented
context that can inform the decision-making process for integrating state-of-the-art instrumentation systems for rotor blade health monitoring onboard operational helicopters. This paper highlights the dichotomy faced by designers who have a choice to follow either a reactive strategy based
on operational experience or a preventative approach based on technological trends.
Knowledge and practice of birth preparedness and complication readiness among pregnant women in Kano, Nigeria
Authors: Rabiu Ayyuba , Ladu Habiba Isah
Published: August 2019

Knowledge of birth preparedness and complication readiness in pregnant women is the process of planning for safe delivery and anticipating the action needed in case complications arise. This study was aimed at determining the knowledge of birth preparedness and complication readiness, among pregnant women attending antenatal clinic in Murtala Muhammad specialist hospital, Kano. A descriptive cross-sectional design was used. Data was collected using interviewer administered structured questionnaire from 394 pregnant women attending ante-natal clinic. The questions elicited pregnant women’s socio-demographic characteristics, knowledge of birth preparedness and complication readiness, and the factors that influence them. Data were analyzed using SPSS version 19 Computer Software. Three hundred and ninetyfour pregnant women were recruited within the period. The mean age ±SD was 26.9±6.21 years. Two hundred and ninety-four pregnant women (75.8%) were aware of the concept of birth preparedness, while 94 (24.2%) were oblivious. A larger proportion of the respondents 237 (60.2%) had the opinion that women can save money to prepare for birth, while 75 (19.0%) believed women should identify mode of transport as part of birth preparedness. Majority of the pregnant women 96 (54%) revealed that their community provides them with transport services as part of assistance during child birth. Educational status is associated with knowledge of birth preparedness (χ2= 4.081, P=0.05). The study revealed that there is fair knowledge of birth preparedness and complication readiness and saving money was the commonest birth preparedness practice known among the respondents.
Pattern of pediatric fine needle aspiration cytology and its utility in management of head and neck swellings in a tertiary hospital in northwestern Nigeria
Authors: Ibrahim Hafsat Umar , Kabir Halima , Ibrahim Yusuf
Published: August 2019

Childhood malignancies have emerged as an important cause of morbidity and mortality globally. Diagnosis need to be accurate and fast to reduce this. Fine Needle Aspiration Cytology (FNAC) is an accepted modality employed in the diagnosis of adult and pediatric tumors. This study aims to review the pattern of pediatric FNAC from all sites done over a 10-year period, and its utility in the management of head and neck swellings. Records of all pediatric FNAC within the 10-year study period were retrospectively retrieved and analyzed. Data regarding age, sex, site of biopsy and FNAC diagnoses were extracted. Subsequent histologic diagnoses from the head and neck region were correlated with initial FNAC diagnoses from the same region. Data were presented in frequencies and percentages in tabular form. Accuracy, sensitivity, specificity, Positive Predictive Value (PPV) and Negative Predictive Value (NPV) of head and neck lesions were calculated. A total of 301 pediatric FNAC were recorded. There were 160 (53.8%) males and 141 (46.2%) females with a M: F ratio of 1.1:1. The average age was 7.2 ± 3.9 years. The highest frequency of 134 (44.5%) was seen in the 5-10 years age group. Benign cytological diagnoses were rendered in 243 (80.7%) while the remaining 58 (19.3%) were malignant. Of the total, 244 FNAC were from head and neck Swellings, 209(80.7%) were benign while the remaining were malignant. Sixty-two (62) cases of head and neck FNAC had subsequent histologic tissue diagnoses (considered the gold standard) which were compared with prior FNAC results. FNAC of the head and neck showed an accuracy 82.1%, sensitivity of 53.0%, specificity of 93.3%, PPV and NPV of 75.0% and 84.0% respectively. FNAC is an easy, fast, cheap and minimally invasive screening tool that is accurate for diagnosis in the management of pediatric head and neck swellings in our setting.
Frontal plane knee alignment among normal northern Nigerian adults: A radiographic study
Authors: Gwani Abdullahi Suleiman , Otong Eduitem Sunday , Bello Sani Abubakar , Ahmed Hamza Mustapha , Joseph Dlama Zira , Aliyu Yusuf
Published: August 2019

Studies have shown that knee alignment parameters differ among races. However, to our knowledge, radiographic frontal plane knee alignment has not been studied in normal northern Nigerian adults. The objective of this study was therefore to determine the frontal plane knee alignment in normal northern Nigerian adults. This study recruited a total of 59 consented subjects (44 males, 15 females). The entire subjects are without any history of lower extremity deformity. Anteroposterior radiographs of both knees with the patella positioned straight ahead were obtained from each participant while standing in a relaxed bipedal stance and placing equal weight on each limb. Alignment was assessed by measuring the tibiofemoral angle (TFA), distal femoral angle (DFA) and proximal tibial angle (PTA). The angles were measured with the aid of a universal plastic goniometre and a plastic ruler. Descriptive statistics of the alignment parameters, independent and paired t-test were computed. In the male population, the mean (standard deviation) obtained were 179.06 (3.87)o for the TFA, 85.94 (3.03 o for the DFA and 89.27 (3.26)o for the PTA. In the female population, the values were 179.53 (3.38)o for the TFA, 86.40 (2.97)o for the DFA and 89.27 (2.15)o for the PTA. No significant mean difference was observed between genders in all the parameters. The TFA does not show any significant difference between the right and left angle regardless of gender. However, significant mean differences were observed in the DFA and PTA of males and combined population. No significant difference was observed in the DFA and PTA of females. Accordingly, northern Nigerian adults may have varus knee alignment compared to other races. Thus, this pre-existing varus alignment should be taken into consideration during clinical examination, preoperative planning and postoperative evaluations of knee deformities in this population.
Personal style of the therapist and personality dimensions in a sample of Argentinian therapists
Authors: Casari Leandro Martín , Ison Mirta Susana , Gómez Beatriz Margarita María
Published: August 2019

The Personal Style of the Therapist (PST) is an important aspect to assess in the therapeutic process. Previous research has explored therapist’s profiles and their differences according to a variety of theoretical orientations, as well as the association between these profiles and personality traits. This study aims to put together these lines of research through a cluster analysis. The specific goals were to describe the profiles of therapists with respect to the functions of the PST and personality traits; and to analyze whether the professionals’ profiles and their theoretical orientations were related. The sample was comprised of 546 Argentinian therapists. The Personal Style of the Therapist Questionnaire (PST-Q) and the Big Five Inventory (BFI) were used as measuring instruments. Using the methodology of hierarchical analysis based on a cluster analysis integrating the five factors of the PST, a four-cluster solution was confirmed to be the most satisfactory. Subsequently, a cluster analysis of k-means based on the five factors of each test (PST-Q and BFI) was performed. Finally, the relationship between the clusters and theoretical orientation and years of clinical practice was assessed, rendering positive outcomes. The results are discussed based on previous research studies and the significance of studying the therapist’s personal variables and their connection with psychotherapy efficacy.
Hoofstuk 4: Die verhouding tussen die narratiewe teks en die storie
Authors: Potgieter J.H.
Published: August 2019

No abstract available.
Inleiding
Authors: Barkhuizen J.H.
Published: August 2019

No abstract available.
Knowledge and attitudes of teachers regarding the impact of classroom acoustics on speech perception and learning
Authors: Ramma Lebogang
Published: August 2019

This study investigated the knowledge and attitude of primary school teachers regarding the impact of poor classroom acoustics on learners’ speech perception and learning in class. Classrooms with excessive background noise and reflective surfaces could be a barrier to learning, and it is important that teachers are aware of this. There is currently limited research data about teachers’ knowledge regarding the topic of classroom acoustics. Seventy teachers from three Johannesburg primary schools participated in this study. A survey by way of structured self-administered questionnaire was the primary data collection method. The findings of this study showed that most of the participants in this study did not have adequate knowledge of classroom acoustics. Most of the participants were also unaware of the impact that classrooms with poor acoustic environments can have on speech perception and learning. These results are discussed in relation to the practical implication of empowering teachers to manage the acoustic environment of their classrooms, limitations of the study as well as implications for future research.
The identification process in Early Communication Intervention (ECI) by Primary Health Care personnel in Ditsobotla sub-district
Authors: Van der Linde Jeannie , Kritzinger Alta , Redelinghuys Aniel
Published: August 2019

Based on clinical observations, case finding for early communication intervention service delivery in rural  areas, such as Ditsobotla sub-district, is limited. The study described the identification process used for infants and young children at risk for communication delay and disorders as part of a proposed incremental implementation of early communication intervention services within the existing primary healthcare package. A descriptive survey design was followed. A rating scale was utilized and interviews were conducted with 20 randomly selected primary healthcare personnel and eight primary healthcare programme managers in Ditsobotla sub-district in North West province. The aims were to describe the early identification methods/processes, resources and limitations and provide guidelines to introduce early communication intervention services in a rural community. The results indicated that the identification process was limited. An incremental implementation of the different early communication intervention functions within the primary health care package appears feasible. Implications of the findings may be applied to initiate early communication intervention services, based on integrated teamwork, in a rural district in South Africa.
Customers' perception of bank service quality: The importance of employee service quality
Authors: Govender K. K.
Published: August 2019

In financial services marketing, especially among banks, there is limited opportunity to impress the customer because services are becoming more automated. This paper reports the findings of a mail survey using self-administered questionnaires, conducted among a random sample of 1050 bank customers. From a usable sample of 190 respondents, it was found that the customers' perception of the overall service quality [SQUAL] is positively associated with their perception of the bank employees' service quality [EQUAL]. This implies that service firm managers need to understand what kind of employee behaviour most effectively serves to satisfy customers, and also discover ways to foster such behaviour by their customer contact employees. An agenda for future research is proposed.
Origins of economic instability: Real, financial or both? - Part II: An appraisal of Minsky's financial instability hypothesis
Authors: Hart J. S.
Published: August 2019

Part I of the paper discussed Hyman Minsky's instability hypothesis and its main critics. Part II now gives a general appraisal of Minsky's theory.
Financial accounting and reporting in developing countries: A South African perspective
Authors: Oberholster Johan
Published: August 2019

South Africa is currently going through major changes in political, social and other arenas. It is therefore appropriate to consider the effect of these developments on financial reporting in a changing environment. This paper explores the origins of the current South African accounting system, given its status as a developing country, and endeavours to show that financial reporting needs to be amended to reflect the changing face of the South Africa's social fabric, its status as a developing country, as well as the emergence of new users of financial statements. Certain recommendations are made to address these issues.
International financial stability: How can it be restored and maintained?
Authors: Crockett Andrew
Published: August 2019

No abstract available.
Factors affecting the use of price risk management tools by large commercial maize producers in South Africa
Authors: Brown A. , Ortmann G. F. , Darroch M. A.G.
Published: August 2019

Ordinary Least Squares regression was used to examine what characteristics affect the use of maize price risk management tools by a sample of large commercial South African maize producers in 1998. The use of maize storage facilities, off-farm employment, formal crop insurance, length of formal education of operators and the proportion of farm turnover from maize, all positively influence producers' use of these tools. Crop insurance thus appeared to be a complementary method of risk management. In contrast to previous United States studies, operators' self-rated score of marketing management ability was negatively related to the use of price risk management tools. Maize marketing seminars and other sources of information on managing price risk would reduce adoption costs and encourage broader producer participation
The impact of organisational restructuring on organisation climate and employee attitudes
Authors: Brand H. E. , Wilson J.
Published: August 2019

This study investigated the impact of an organisational restructuring intervention on the climate of an organisation and the attitudes of its employees. An organisation climate and employee attitude questionnaire were used as measuring instruments. A convenience sample was used, comprising all personnel of the specific organisation. Results show that the restructuring did in fact influence the organisation climate and affected employee attitudes. Recommendations based on the results of and experiences gained from the study, are that effective communication should be seen as having a direct influence on successful organisation restructuring and that an effective performance management system is essential in providing employees with opportunities to measure own performance against organisation performance standards during a period of restructuring and change.
On the emergence of firms and sick institutions
Authors: Mahadea D.
Published: August 2019

Organisations and firms are formed by people and entrepreneurs. Firms can become sick just as people do. Not all firms live forever. This paper examines the emergence of "sick" institutions. Organisations can become unhealthy when there is a mismatch between goods and services they produce and the external environment in which they operate. Survival and fitness of an organisation depend on its ability to respond and adapt cost-effectively to the changing environment. Entrepreneurship, n-Achievement and productivity of individuals are critical to an organisation's health. A thorough diagnostic framework of symptoms of organisational ills is required before prescribing any therapy, to bring about a healthy organisation. The future belongs to healthy firms, with adaptable strategies and resources that optimally fit the changing environment.