bluuebunny/crossref_metadata_2025_split huggingface dataset:
El conocimiento didáctico-matemático: una propuesta de evaluación de tres de sus facetas
Authors: Castro Walter , Pino-Fan Luis , Velasquez Hilduara 
Published: August 2017

En esta comunicación se presentan algunos criterios tenidos en cuenta para el diseño de un cuestionario para evaluar tres facetas del conocimiento matemático para la enseñanza de la derivada: el conocimiento común del contenido, el conocimiento especializado y el conocimiento ampliado. Así mismo se presenta una tarea propuesta en el cuestionario aplicado a estudiantes de las licenciaturas en Básica Matemáticas y Matemáticas -Física de la Universidad de Antioquia, Colombia.
Adaptación de un enfoque para el diseño de secuencias didácticas que permitan el desarrollo de actitudes positivas hacia las matemáticas
Authors: Anibal Rey Jairo , Quiroga Tricia , Martínez Gladys Cecilia 
Published: August 2017

El trabajo que se muestra a continuación es el resultado de una investigación acerca del desarrollo de actitudes positivas hacia las matemáticas, partiendo del hecho que el aprendizaje debe abordar aspectos de tipo cognitivo, expresivo y afectivo. En esta investigación se hace una propuesta en la que los procesos de medición, generalización y simbolización, son las enseñanzas que se llevan al aula a través de una secuencia didáctica que tiene como referentes teóricos las propuestas del Modelo DECA, Juan Díaz Godino y Pedagogía Conceptual, de donde surge la adaptación de un enfoque para el diseño de secuencias didácticas que permitan generar actitudes positivas hacia lasmatemáticas en estudiantes de grado octavo, reflejadas en la confianza para aprender y resolver problemas.
Diseños didácticos con incorporaciones tecnológicas para el aprendizaje de las formas geométricas, en primeros grados de escolaridad de estudiantes sordos-Instructional technology designs for learning geometric shapes additions in early grades of schooling of deaf students
Authors: Leon Olga Lucia , Díaz-Celis Faberth , Guilombo Marcela 
Published: August 2017

Este artículo presenta resultados de investigaciones sobre diseños didácticos con incorporaciones tecnológicas para el aprendizaje de la geometría en estudiantes sordos, de los primeros grados de escolaridad. Los resultados profundizan en la relación trayectorias de aprendizaje y diseños didácticos para la enseñanza inicial de la geometría y presentan una experiencia focal con estudiantes sordos. Se destacan las mediaciones semióticas y tecnológicas en los procesos de significación de las formas geométricas. La metodología recupera los fundamentos de los “experimentos de enseñanza”, en particular la estructura denominada “el ciclo de enseñanza”.
Propuesta didáctica para la enseñanza de las nociones topológicas
Authors: Rojas Gómez Jorge Alejandro , Ariza Daza Aura Alejandra 
Published: August 2017

Por medio de este trabajo se quiere mostrar una experiencia de aula encaminadahacia la enseñanza de las nociones topológicas, las cuales son de bastanteimportancia ya que los niños desde muy pequeños están relacionándosecon diversos espacios, teniendo la necesidad de desenvolverse en un medio apartir de su orientación o indicaciones producidas por los demás, viendo laobligación de utilizar sus sentidos y demás herramientas que se deben ir complejizando a medida que se les potencie su pensamientos espacial, el cual esconsiderado entre las inteligencias múltiples propuestas por Howard Gardner.
Funciones Que Cumple El Cuaderno Resolutor Al Abordar Una Situación Problema
Authors: Rodriguez Muriel Sindy Viviana , Rodriguez Mayorga Yenifer Yulieth , Peña Ramirez Claudia Patricia , Mosquera Sanchez Maryuri 
Published: August 2017

Este artículo está especialmente elaborado para docentes y/o alumnos para profesores que deseen trabajar en la búsqueda de la solución de problemasa partir de la metodología del cuaderno Resolutor, partiendo de la experiencia en el aula con un grupo de estudiantes donde se lleva a cabo una situación – problema (lugares geométricos), haciendo énfasis en la resolución de problemas que se plantea desde la teoría y contrastando con la experiencia propia que se tiene para llegar a la solución del problema.se formulen preguntas: ¿Qué es un cuaderno resolutor?, ¿Cómo lo manejan los estudiantes?, ¿Qué instrucciones se le daban para escribir en el cuaderno?, clarifique el objetivo, defina y ejecuta el plan de acción yfinalmente se evalúe la solución.
Influence of smallholder farmers’ perceptions on adaptation strategies to climate change and policy implications in Zimbabwe
Authors: Jiri Obert , Mtali-Chafadza Linda , Mafongoya Paramu L. 
Published: August 2017

AbstractSmallholder agricultural production is largely affected by climate change and variability. Despite the negative effects brought by climate variability, smallholder farmers are still able to derive livelihoods. An understanding of factors that influence farmers’ responses and adaptation to climate variability can improve decision making for governments and development partners. This study investigated farmers’ perceptions and adaptation strategies to climate change and how these influence adaptation policies at local level. A survey was conducted with 100 households randomly selected from Chiredzi district. Data collected was used to derive farmer perceptions to climate change as well as the influence of their perceptions and subsequent adaptation methods to ensuing local agricultural adaptation measures and policies. The results indicated that smallholder farmers perceived general reduction in long-term annual rainfall and rising local average temperatures. Adverse trends in rainfall and average temperature perceived by farmers were consistent with empirical data. These perceptions and other socio-economic factors helped to shape smallholder farmer agricultural adaptation strategies. Policy implications are that the government and development partners should seek ways to assist autonomous adaptations by farmers through investments in planned adaptation initiatives.
Impact of Deficit Irrigation on Yield and Chemical Properties of Soybean Seeds in Temperate Climate
Authors: Kresović Branka , Gajić Boško , Tapanarova Angelina , Pejić Borivoj , Dugalić Goran , Sredojević Zorica 
Published: August 2017

Summary
The goal of this research is to determine the effects of different levels of water deficit (I100: full irrigation, I65: 35% deficit, I40: 60% deficit and I0: no irrigation) on yield and chemical composition of soybean [Glycine max (L.) Merr.] grown in Srem region of Serbia. Water deficit significantly affected the yield and chemical composition of soybean seeds. The lowest (1.63 t/ha) and the highest (3.21 t/ha) seed yields were obtained from I0 and I65 treatments, respectively. Furthermore, the highest protein (1092 kg/ha) and oil (563 kg/ha) yields were observed in I65 treatment. Lower and higher irrigation levels from I65 decreased the protein and oil yields. Our data indicated that irrigation generally increased K, P, Mg, Mn, Cu, Zn and B concentrations and decreased Ca and Fe concentrations in soybean seed. It was clearly observed that full-watered treatment (I100) provided no potential benefit in terms of soybean yield and chemical composition. For higher economic yield and good nutritional quality, water-saving treatment I65 could be suitable in soybean management in Srem region of Serbia as in other regions with similar soil and climate conditions.
Morphometric Characterization and Body Measurement Correlation in Dubska Pramenka Sheep
Authors: Važić Božo , Rogić Biljana , Pihler Ivan , Drinić Milanka , Savić Nebojša 
Published: August 2017

Summary
The purpose of this study is to determine the morphometric characterization of Dubska Pramenka sheep and to establish a relationship between the most important body measurements of ewes and rams within the strain. The Dubska Pramenka is one of the biggest strains within the Pramenka breed. The wither heights of ewes and rams were 73.37 cm and 79.92 cm respectively, whereas the body lengths were 74.66 cm (ewes) and 80.42 cm (rams), and the rump heights were 73.72 cm (female) and 80.16 cm (male). Based on the data presented, it is evident that the Dubska Pramenka sheep has almost a square body shape with the rump height slightly greater than the wither height. The chest depth and shoulder width of ewes were 34.50 cm and 22.72 cm respectively, whereas those of males were 36.17 cm and 23.75 cm. In both sheep genders, the hip width (ewes 21.92 cm, rams 22.91 cm) was lower than the shoulder width. The chest and shin perimeters of females were 98.72 cm and 9.31 cm respectively, whereas those of males were 103.25 cm and 10.91 cm. The most significant correlation and statistical significance were recorded in relation to the measured wither and rump heights (r = 0.856 for females, r = 0.856 for males) due to their constant increase during the growth and development of sheep. Conversely, the measurements of rump heights and chest perimeters did not indicate any correlation (r = −0.028 for ewes, r = 0.004 for rams).
Effect of the Duration of Liquid Nitrogen Storage on the Regrowth of Blackberry Cryopreserved by Droplet Vitrification
Authors: Vujović Tatjana , Ružić Đurđina , Cerović Radosav 
Published: August 2017

Summary
In vitro shoot tips of the blackberry cultivar ‘Čačanska Bestrna’ were cryopreserved using the droplet vitrification technique. Upon loading (30 min) in a solution of 1.9 M glycerol and 0.5 M sucrose, the explants were dehydrated for 40 min on ice with the PVS A3 vitrification solution (glycerol 37.5%, dimethyl sulfoxide 15%, ethylene glycol 15% and sucrose 22.5%) and for 40 min at room temperature with the PVS3 solution (glycerol 50% and sucrose 50%). They were subsequently frozen in individual microdroplets of vitrification solution, by direct immersion in liquid nitrogen (LN), and kept therein for 2, 4, 8 and 24 h. The explant rewarming was performed in an unloading solution (0.8 M sucrose) for 30 min at room temperature. The duration of LN exposure did not exert significant effects on the survival and regrowth of explants in both types of vitrification solutions. The survival and regrowth of cryopreserved shoot tips dehydrated with PVS3 solution ranged between 90–95% and 80–90%, respectively. However, dehydration with PVS A3 resulted in a lower survival rate (80–90%) and a considerably lower regrowth rate (55–65%) of explants. Monitoring the shoots regenerated in the in vitro culture revealed their normal capacity for multiplication and rooting in comparison with the controls, which fully confirms the purpose of cryopreservation in the long-term preservation of plant material.
Germination and Relations between Seed Quality Characteristics for Acer pseudoplatanus and Acer pseudoplatanus ‘Atropurpureum’
Authors: Kostić Saša , Čukanović Jelena , Ljubojević Mirjana , Mladenović Emina , Mrđan Snežana , Svilokos Nina 
Published: August 2017

Summary
The purpose of this paper is to analyze relations between seed quality characteristics and the influence of contaminated urban areas on seed quality of sycamore maple trees in different locations across Novi Sad (Serbia). This research analyzed seed germination of 29 adult trees of sycamore maple (Acer pseudoplatanus L.) and its red leaf variety (Acer pseudoplatanus ‘atropurpureum’ Späth.). Our results indicate a medium strong positive correlation between seed weight and viable seed. Sycamore maple trees from the same urban typology do not have significant influence on seed quality characteristics, while different urban typology has such influence. These results explain the negative influence of urban areas on seed quality characteristics. For selection of high value trees in urbanized and contaminated areas, seed quality can be the indicator of adaptability to stress related conditions.
Analysis of the Features of Hunting Grounds in Serbia
Authors: Lavadinović Vukan M. , Popović Zoran , Beuković Dejan , Danilović Milorad , Đorđević Milutin 
Published: August 2017

Summary
Covering almost the entire territory of Serbia, hunting grounds occupy a unique role not only in the country’s hunting practices but also in game management and wildlife conservation. Therefore, it is useful to be acquainted with their characteristics in order to manage game in a sustainable manner. Nevertheless, there has not been a proper study on the condition of hunting grounds in Serbia since the country’s transition process, which reshaped the hunting sector as a whole. The purpose of this research is to identify and analyze the features of hunting grounds in Serbia in order to establish a base for future scientific research and appropriate decision making. The research results were obtained on the basis of the data on 272 hunting grounds in Serbia, collated during the hunting year of 2012/2013 and compared with the last comprehensive hunting analysis at the national level in 2001. The analysis suggests that the regal hunting system is still predominant in Serbia. The quality of hunting grounds has been enhanced to a certain extent, although there are yet some challenges which pose a threat to sustainable management such as the oversized hunting areas, lack of employees and poor financial condition.
Potential of Agricultural Biomass: Comparative Review of Selected EU Regions and Region of Vojvodina
Authors: Odavić Petrana , Milić Dragan , Zekić Vladislav , Tica Nedeljko 
Published: August 2017

Summary
Owing to the fact that the EU is committed to reducing greenhouse gas emissions by 20% below 1990 levels by 2020, and having in mind their high dependence on import of oil and oil derivatives, which, in turn, causes instability of power supply, increasing attention is being paid to renewable energy sources. Given the ongoing pre-accession process of the Republic of Serbia in relation to the EU, in order to determine the capacity of the country to increase the share of energy use from renewable sources, in this paper clustering of selected regions in the EU-28 has been carried out, after which a comparative analysis of regions was performed in terms of potential of agricultural biomass, for the purpose of generating energy. The aim of this study is to determine the level of the region of Vojvodina in relation to ten selected EU regions, based on parameters that affect the potential for using renewable energy sources, primarily residues from agriculture. By applying the K-means method, Borda count method and comparative analysis, and based on empirical data, results show that the region of Vojvodina takes a significant fifth place. Its share of agricultural land ranks it as the first, whereas production of cereals and the total number of farms larger than 100 ha rank it as the second. It could be concluded that Vojvodina is an agricultural region with large quantities of plant remains, primarily those left over from harvest, which represents a significant potential for energy generation from agricultural biomass.
Geological evolution of the southwestern part of the Veporic Unit (Western Carpathians): based on fission track and morphotectonic data
Authors: Vojtko Rastislav , Králiková Silvia , Andriessen Paul , Prokešová Roberta , Minár Jozef , Jeřábek Petr 
Published: August 2017

AbstractZircon and apatite fission track (FT) and morphotectonic analyses were applied in order to infer quantitative constraints on the Alpine morphotectonic evolution of the western part of the Southern Veporic Unit which is related to: (1) Eo-Alpine Cretaceous nappe stacking and metamorphism of the crystalline basement in the greenschist facies. (2) Exhumation phase due to underthrusting of the northerly located Tatric-Fatric basement (~ 90–80 Ma), followed by a passive en-block exhumation with cooling through ~ 320–200 °C during the Palaeocene (ZFT ages of ~ 61–55 Ma). (3) Slow Eocene cooling through ~ 245–90 °C, which most likely reflected erosion of the overlying cover nappes and the Gosau Group sediments. Cooling reached up to 60 °C till the Oligocene (AFT ages of ~ 37–22 Ma) in association with erosion of cover nappes. The efficient Eocene erosion led to the formation of the first Cenozoic planation surface with supergene kaolinization in many places. (4) The early Miocene erosion coincided with surface lowering and resulted in the second planation surface favourable for kaolinization. (5) In the middle Miocene, the study area was covered by the Poľana, Javorie, and Vepor stratovolcanoes. (6) The late Miocene stage was related to the erosion and formation of the third Cenozoic planation surface and the final shaping of the mountains was linked to a new accelerated uplift from the Pliocene.
The pre-Cainozoic basement delineation by magnetotelluric methods in the western part of the Liptovská kotlina Depression (Western Carpathians, Slovakia)
Authors: Fendek Marián , Grand Tomáš , Daniel Slavomír , Blanárová Veronika , Kultan Vincent , Bielik Miroslav 
Published: August 2017

AbstractThe geology and hydrogeology of the Liptovská Kotlina Depression were studied by means of new geophysical methods. Controlled source audio-frequency magnetotellurics enabled us to delineate the relief of the pre-Cainozoic basement in the western part of the Liptovská Kotlina Depression into two segments with different lithostratigraphic units. Our complex findings disprove the interconnection between the Bešeňová and Lúčky water bearing structures located in the study area. The results were interpreted in the form of a resistivity cross section and resistivity model. The geological interpretation of the obtained results, taking into account the other geophysical and geological constrains showed that the pre-Cainozoic basement has a tectonically disrupted, broken relief. The Bešeňová and Lúčky structures appear to be isolated by the Palaeogene sediments (sandstone, claystone) and in the deeper part also by marly carbonates and marlstones of the Jurassic age belonging to the Fatricum. It was confirmed that the structural connectivity of geothermal aquifers in the area between the Bešeňová and Lúčky–Kaľameny should not exist. The assumption of different circulation depth was also confirmed by geothermometry and existing radiocarbon analyses applied on groundwater in both areas.
Advances in the Treatment of Human Immunodeficiency Virus and Hepatitis B Virus Co-infection
Authors: Sun Guofang 
Published: August 2017

AbstractHepatitis B virus (HBV) and human immunodeficiency virus (HIV) are transmitted through the same pathways. Therefore, the incidence of HBV in the HIV-infected population is higher than that in the healthy population, and is more obvious in China given the high HBV prevalence in the country. HIV and HBV co-infection can accelerate the disease process of HBV. Moreover, the incidence of cirrhosis and end-stage liver disease is higher in patients co-infected with HIV and HBV than in patients infected HBV alone. When treating patients co-infected with HIV and HBV for HBV infection alone, care should be taken to avoid the induction of HIV resistance. HBV should be considered during drug selection for anti-retroviral treatment. Furthermore, the effective HBV treatment should be retained if anti-retroviral drugs require changing.
Research progress in the targeted monitoring of surgical site infections
Authors: Jia Pingdong 
Published: August 2017

AbstractSurgical treatment can decrease the pain burden of patients, as well as improve their quality of life and social satisfaction. However, postoperative infection and other complications may harm patients and may even cause surgical failure and death. This review describes the definition, classification, and status of surgical site infection (SSI). In addition, this review provides an analysis of the relevant risk factors that result in SSI, and proposes the corresponding preventative and control measures for each different risk factor.
Advances in Studies on Prevalence and Interaction Mechanism of Acquired Immunodeficiency Syndrome and Tuberculosis Coinfection
Authors: Meng Chao , Li Na , Tong Zhaoxiao , Yan Huangxin , Min Shenxiao 
Published: August 2017

AbstractHuman immunodeficiency virus (HIV) and tuberculosis (TB) coinfection is a serious public health problem. HIV and TB promote each other, accelerating development of HIV to acquired immunodeficiency syndrome (AIDS) and heightening TB mortality. Determining interaction mechanism between HIV andMycobacterium tuberculosiscan lead to development of effective treatments. This study summarizes prevalence status of AIDS and TB coinfection and research advances concerning their interaction mechanism.
Simulation Algorithm to Determine the Number of Un-Served Calls when Transferring the Signal in Broadband Cellular Networks
Authors: Otsetova-Dudin E. , Kurtev I. , Siarova S. 
Published: August 2017

Abstract
Planning and design of cellular networks is associated with the creation of traffic models for the transfer of signal using schemes with priorities within which assess the probability parameters of quality of service is performed. The study of these parameters is associated with the creation of a simulation model and an algorithm of broadband handover.
Evidence for the involvement of the GABA-ergic pathway in the anticonvulsant activity of the roots bark aqueous extract of Anthocleista djalonensis A. Chev. (Loganiaceae)
Authors: Taiwe Germain Sotoing , Kouamou Arielle Larissa Ndieudieu , Ambassa Armelle Rosalie Mbang , Menanga Joseph Renaud , Tchoya Thierry Bang , Dzeufiet Paul Desire Djomeni 
Published: August 2017

Abstract

Background:
The root bark of Anthocleista djalonensis A. Chev. (Loganiaceae) is widely used in traditional medicine in Northern Cameroon to treat epilepsy and related conditions, such as migraine, insomnia, dementia, anxiety, and mood disorders.

Methods:
To investigate the anticonvulsant effects and the possible mechanisms of this plant, an aqueous extract of Anthocleista djalonensis (AEAD) was evaluated by using animal models of bicuculline-, picrotoxin-, pilocarpine-, and pentylenetetrazole-induced convulsions. Their effects on brain γ-aminobutyric acid (GABA) concentration and GABA-T activity were also determined.

Results:
This extract significantly protected mice against bicuculline-induced motor seizures. It provided 80% protection against picrotoxin-induced tonic-clonic seizures, and strongly antagonized convulsions induced by pilocarpine. AEAD also protected 100% of mice against pentylenetetrazole-induced seizures. Flumazenil, a central benzodiazepine receptor antagonist and FG7142, a partial inverse agonist in the benzodiazepine site of the GABAA receptor complex, were found to have an inhibitory effect on the anticonvulsant action of AEAD in pentylenetetrazole test. Finally, the brain GABA concentration was significantly increased and GABA-T activity was inhibited by AEAD.

Conclusions:
The effects of Anthocleista djalonensis suggested the presence of anticonvulsant properties that might involve an action on benzodiazepine and/or GABA sites in the GABAA receptor complex or by modulating GABA concentration in the central nervous system (CNS).
The Rule of Temperature Coefficients for Selection of Optimal Separation Sequence for Multicomponent Mixtures in Thermal Systems
Authors: Tsirlin Anatoly , Andreevich Sukin Ivan , Balunov Alexander , Schwalbe Karsten 
Published: August 2017

AbstractIn this paper an estimate for the reversible molar heat supply needed for fully separating a certain mixture is given on the basis of thermodynamic balance equations. It is shown that in order to estimate this heat supply one should solve the problem of selecting the optimal separation sequence. The algorithm solving this task is given. This algorithm allows to select the separation sequence on the basis of preliminary calculations, knowing only the properties of the component that one wants to separate. The solution algorithm is demonstrated for an exemplary system: a gas-fractionation plant.