bluuebunny/crossref_metadata_2025 huggingface dataset:
L’influence de la personnalité proactive sur la performance adaptative : le rôle du sentiment d’auto-efficacité et de la justice organisationnelle perçue
Authors: Charbonnier-Voirin Audrey , El Akremi Assâad
Published: August 2016

Cette étude s’intéresse à l’influence de la personnalité proactive sur la performance adaptative. Les résultats de l’étude menée auprès de 232 salariés montrent que la personnalité proactive influence significativement la performance adaptative. Conformément à la distinction faite entre les antécédents distaux et proximaux de la performance, cette étude montre également que le sentiment d’auto-efficacité médiatise partiellement cette relation. Par ailleurs, la justice organisationnelle représente une variable contextuelle modératrice qui interagit avec la personnalité proactive pour renforcer le sentiment d’auto-efficacité. L’intérêt d’une approche interactionnelle qui intègre les différences individuelles et les variables contextuelles pour mieux comprendre la performance adaptative est discuté en conclusion.
Est-ce que je dois prendre mon bébé (avant l’âge d’un an) dans les bras ?
Authors: Blackman Jerome S.
Published: August 2016

Au cours des décennies, beaucoup d’études psychanalytiques de développement des enfants de moins d’un an ont conclu que la mère doit calmer un bébé qui crie. Contrairement à la recommandation des comportementalistes, qui suggèrent que la mère laisse l’enfant pleurer sans l’apaiser, les informations de chercheurs de diverses orientations psychanalytiques concluent que le bercement, l’alimentation, et l’apaisement verbal pour les images maternelles primaires sont requis pour préparer à la santé mentale de l’enfant pendant le reste de son développement.
Les mésaventures de la notion de dépression essentielle
Authors: Candilis-Huisman Drina
Published: August 2016

Les nouvelles donnes de la procréation ont fait émerger de nouvelles formes de parentalité. Les personnes en situation de handicap sensoriel et moteur pour lesquelles la médecine contemporaine a donné l’espoir d’une vie meilleure sinon des possibilités de guérison, sont de plus en plus tentées par l’aventure du devenir parent. Comment et à quel prix ces personnes peuvent-elles exercer leur parentalité dans la plus grande autonomie possible ? Tel est l’objet de notre réflexion dans cet article.
Mères aveugles de bébés en souffrance
Authors: Ikiz Tevfika
Published: August 2016

Dans cet article, l’auteur va présenter un matériel de cas concernant un patient qui a demandé une psychothérapie comme elle avait des difficultés à gérer ses problèmes au sein de sa famille. Cette vignette clinique révèle comment certaines mères ont des difficultés à être, comme dit Winnicott, « des mères dévouées ordinaires ». Elles sont « psychologiquement aveugles », en ce sens qu’elles ne sont pas capables psychologiquement de « voir » ou de sentir la souffrance de leurs bébés ou de leurs enfants. L’auteur traite le cas prenant en considération les concepts essentiels de Winnicott et de Bion à propos de comment le patient est privé de fonctionnement maternel.
Regards croisés sur une pathologie développementale d’origine génétique.
Authors: Potier Rémy , Putois Olivier , Lyonnet Stanislas , Weitzman Jonathan B. , Villa François
Published: August 2016

On articule la médecine génétique, la pédopsychiatrie et la psychopathologie psychanalytique pour proposer une caractérisation psychanalytique de l’impact psychique d’une pathologie développementale d’origine génétique à fort versant neurologique, la microdélétion 22q11.2. Après une caractérisation de la microdélétion, et du style relationnel des enfants qui en sont affectés, nous soulignons d’abord l’effraction du narcissisme familial que représente cette atteinte, et les voies par lesquelles la contenir en travaillant l’annonce. Nous proposons ensuite d’intégrer à la prise en charge polyfactorielle un suivi psychothérapique de la famille, et de l’enfant, centrés sur l’étayage du mouvement interactif vers autrui que l’enfant manifeste spontanément. Nous indiquons quelques pistes suivant lesquelles déployer cet étayage.
L’émergence de la parole chez l’enfant à la croisée de la médecine génétique et de la psychanalyse
Authors: Madeira Manoel , Varela Andréa
Published: August 2016

Cet article aborde le dialogue entre la psychanalyse et la médecine génétique à partir du Syndrome de l’X fragile et de deux cas cliniques d’enfants. Le travail expose la construction du savoir de la médecine génétique par le biais de signes univoques. À la croisée des regards avec la psychanalyse, ses signes se confrontent à la polysémie des signifiants. Le texte discute de la façon dont cette rencontre agit sur les difficultés de langage chez l’enfant.
Entre idéal dépassé et norme imposée : une représentation figée du père projetée dans une société en mutation
Authors: Essadek Aziz , Assous Adèle , Golse Bernard , Chabin-Fenlon Magali , Fernet-Lucas Corinne
Published: August 2016

L’évolution des lois sur l’autorité paternelle puis parentale a généré une modification des fonctions du père. Mais qu’en est-il des représentations : ont-elles évolué dans la même temporalité ? Nous interrogerons les effets du passage d’une autorité strictement paternelle à parentale. Construire un nouveau modèle paternel semble être un projet périlleux, parfois inconfortable, pour les pères eux-mêmes, les mères mais également les institutions. L’article propose de montrer, à partir d’une historisation de l’évolution juridique de la place des pères dans la société et d’une étude populationnelle réalisée auprès de 796 mineurs au sein d’un service mettant en œuvre des mesures d’AEMO (Assistance Éducative en Milieu Ouvert), que la place des pères dans les institutions sociales est pensée à partir d’une représentation passée, ce qui impacte l’accompagnement et le travail de reparentalisation des pères.
Variability in Response to Bilateral Medial Rectus Recessions in Infantile Esotropia
Authors: Issaho Dayane Cristine , Wang Serena Xiaohong , de Freitas Denise , Weakley David Robert
Published: August 2016

Purpose:

To evaluate factors associated with surgical success in bilateral medial rectus recessions in infantile esotropia.

Methods:

The results of 97 patients with infantile esotropia undergoing surgical correction from January 2010 through December 2013 at Children's Medical Center of Dallas were reviewed. Multivariate logistic regression analysis of risk factors for success and evaluation of the relationship of surgical responses to baseline characteristics were performed.

Results:

The authors achieved an overall success rate of 59% (57 of 97 patients) with one surgery. At the time of surgery, preoperative angle, refraction, amblyopia, and simultaneous inferior oblique surgery were not significantly related to success or failure. The mean dose response was 3.61 ± 1.45 prism diopters per millimeter of surgery and was modestly correlated only with the preoperative deviation (
r
2
= 0.32). Failure was associated with variability in dose-response, not inadequate or inconsistent with surgical dosing.

Conclusions:

Surgical success with bilateral medial rectus recessions in infantile esotropia is limited by the high variability in surgical dose-response.

[
J Pediatr Ophthalmol Strabismus
. 2016;53(5):305–310.]
A method for the direct measurement of surface tension of collected
atmospherically relevant aerosol particles using atomic force microscopy
Authors: Hritz Andrew D. , Raymond Timothy M. , Dutcher Dabrina D.
Published: August 2016

Abstract. Accurate estimates of particle surface tension are required for models concerning atmospheric aerosol nucleation and activation. However, it is difficult to collect the volumes of atmospheric aerosol required by typical instruments that measure surface tension, such as goniometers or Wilhelmy plates. In this work, a method that measures, ex situ, the surface tension of collected liquid nanoparticles using atomic force microscopy is presented. A film of particles is collected via impaction and is probed using nanoneedle tips with the atomic force microscope. This micro-Wilhelmy method allows for direct measurements of the surface tension of small amounts of sample. This method was verified using liquids, whose surface tensions were known. Particles of ozone oxidized α-pinene, a well-characterized system, were then produced, collected, and analyzed using this method to demonstrate its applicability for liquid aerosol samples. It was determined that oxidized α-pinene particles formed in dry conditions have a surface tension similar to that of pure α-pinene, and oxidized α-pinene particles formed in more humid conditions have a surface tension that is significantly higher.
X-ray computed tomography investigation of structures in Opalinus Clay from
large-scale to small-scale after mechanical testing
Authors: Kaufhold Annette , Halisch Matthias , Zacher Gerhard , Kaufhold Stephan
Published: August 2016

Abstract. In the past years X-ray computed tomography (CT) has became more and more common for geoscientific applications and is used from the µm-scale (e.g. for investigations of microfossils or pore-scale structures) up to the dm-scale (full drill cores or soil columns). In this paper we present results from CT imaging and mineralogical investigations of an Opalinus Clay core on different scales and different regions of interest, emphasizing especially the 3-D evaluation and distribution of cracks and their impact on mechanical testing of such material. Enhanced knowledge of the testing behaviour of the Opalinus Clay is of great interest, especially since this material is considered for a long-term radioactive waste disposal and storage facility in Switzerland. Hence, results are compared regarding the mineral (i.e. phase) contrast resolution, the spatial resolution, and the overall scanning speed.With this extensive interdisciplinary scale-down approach it has been possible to characterize the general fracture propagation in comparison to mineralogical and textural features of the Opalinus Clay. Additionally, and as far as we know, a so-called mylonitic zone, located at an intersect of two main fractures, has been observed for the first time for an experimentally deformed Opalinus sample. The multi-scale results are in good accordance to data from naturally deformed Opalinus Clay samples, which enables us to perform systematical research under controlled laboratory conditions. Accompanying 3-D imaging greatly enhances the capability of data interpretation and assessment of such a material.
Quantification of the impact of hydrology on agricultural production as a result of too dry, too wet or too saline conditions
Authors: Hack-ten Broeke Mirjam J. D. , Kroes Joop G. , Bartholomeus Ruud P. , van Dam Jos C. , de Wit Allard J. W. , Supit Iwan , Walvoort Dennis J. J. , van Bakel P. Jan T. , Ruijtenberg Rob
Published: August 2016

Abstract. For calculating the effects of hydrological measures on agricultural production in the Netherlands a new comprehensive and climate proof method is being developed: WaterVision Agriculture (in Dutch: Waterwijzer Landbouw). End users have asked for a method that considers current and future climate, that can quantify the differences between years and also the effects of extreme weather events. Furthermore they would like a method that considers current farm management and that can distinguish three different causes of crop yield reduction: drought, saline conditions or too wet conditions causing oxygen shortage in the root zone. WaterVision Agriculture is based on the hydrological simulation model SWAP and the crop growth model WOFOST. SWAP simulates water transport in the unsaturated zone using meteorological data, boundary conditions (like groundwater level or drainage) and soil parameters. WOFOST simulates crop growth as a function of meteorological conditions and crop parameters. Using the combination of these process-based models we have derived a meta-model, i.e. a set of easily applicable simplified relations for assessing crop growth as a function of soil type and groundwater level. These relations are based on multiple model runs for at least 72 soil units and the possible groundwater regimes in the Netherlands. So far, we parameterized the model for the crops silage maize and grassland. For the assessment, the soil characteristics (soil water retention and hydraulic conductivity) are very important input parameters for all soil layers of these 72 soil units. These 72 soil units cover all soils in the Netherlands. This paper describes (i) the setup and examples of application of the process-based model SWAP-WOFOST, (ii) the development of the simplified relations based on this model and (iii) how WaterVision Agriculture can be used by farmers, regional government, water boards and others to assess crop yield reduction as a function of groundwater characteristics or as a function of the salt concentration in the root zone for the various soil types.
Due Diligence Driving the Success of Mergers and Acquisitions in Macedonia
Authors: Srbinoska Dushica Stevchevska
Published: August 2016

The act of due diligence is of vital importance when considering the possibility to enter the Macedonian market through merger and/or acquisition transactions. In this paper, I discuss that due diligence helps reduce potential risks or even results with curtailing the transaction as most of the Letters of intent never come to life. Many Macedonian entities, both public and private, operate in an environment considerably different to the European Union economies, a fact that inspires many questions with potential investors, especially in those who come from the European Union. If proper preparation takes place, and the expectations and processes are duly taken into account, successful merger and/or acquisition can be conducted in the Republic of Macedonia in spite of facing numerous difficulties.  Finally, I discuss that several suggestions/factors can maximize the chances of success, demonstrated with the example of due diligence process set-up prior to the one.Vip merger that marked the Macedonian communications industry in 2015.
Evaluation of Different Measures of Milk Yield Persistency in Iranian Holstein Dairy Cows
Authors: Torshizi Mahdi Elahi , Mashhadi Mojtaba Hosseinpour
Published: August 2016

Test-day lactation records of primiparous Holstein cows over an eleven-year period were evaluated for persistency and estimates of its heritability and correlation with other lactation traits computed. In this study, 435390 test day records of the first lactation Holstein cows that calved between 2001 and 2011 from 659 herds were analyzed using various procedures of SAS. Per1% (dividing total milk yield between 101-200 days by the yield of the first 100 days of lactation) measure was preferred in the selection of animals for milk yield persistency because of higher heritability (0.084 ± 0.009) and the lower phenotypic correlation with 305 days milk yield (0.424) compare to other persistency measures. The result showed that cows which calved during summer and autumn had slightly higher persistency in comparison to cows that calved in spring or winter. The persistency can be affected by the age at first calving, as cows that calved at a younger age had lower persistency.
Diagnosis and Outcome of Periosteal Chondrosarcoma in Two Cats
Authors: Thompson Elizabeth , Fauber Amy E. , Pool Roy R.
Published: August 2016

Two cats, both over 10 yr old, were presented for evaluation of non-painful bony proliferations on the appendicular skeleton. These proliferations were identifiable via palpation. Radiographs showed a smooth, proliferative bony lesion of the distal femur (case 1) and tarsus (case 2) with mild soft tissue swelling. Surgical debulking with incomplete resection was performed in each cat. Subsequent histopathology resulted in a diagnosis of periosteal chondrosarcoma (PC). Although both cats have experienced local recurrence, both are still alive more than 2.5 yr after mass debulking. Periosteal chondrosarcoma is a differential diagnosis in proliferative cortical bony lesions near an articular surface in older cats. Partial resection of these masses can lead to an excellent quality of life, and proper diagnosis can avoid amputation or even euthanasia.
Hemothorax in Three Dogs with Intrathoracic Extracardiac Hemangiosarcoma
Authors: Rutherford Lynda , Stell Anneliese , Smith Ken , Kulendra Nicola
Published: August 2016

Intrathoracic extracardiac hemangiosarcoma (HSA) is rare in dogs. This report describes three dogs with acute onset dyspnea due to hemorrhagic pleural effusion resulting from intrathoracic extracardiac masses, which were confirmed as HSA by histopathology. The dogs were stabilized with thoracocentesis and intravascular fluid resuscitation. Computed tomography identified intrathoracic masses, which were not originating from the heart or pulmonary parenchyma. Surgical exploration was performed in all cases. Case 1 was euthanized intraoperatively as the tumor could not be dissected from the aorta. In cases 2 and 3, hemostasis and resection of the tumors was successful. Case 2 was euthanized 1 mo after surgery and case 3 was alive at the time of writing, 5 mo postoperatively. Intrathoracic extracardiac HSA should be considered as a differential for nontraumatic hemothorax and surgical treatment can be palliative.
Glioblastoma Multiforme with Hypodipsic Hypernatremia in a Seven-Month-Old Golden Retriever
Authors: Engel Stephanie , Hilling Karen Marie , Meuten Travis Kuder , Frank Chad Brendan , Marolf Angela J.
Published: August 2016

Primary hypodipsic hypernatremia is a rarely reported disease in dogs. Reported underlying causes associated with this disease in dogs include congenital malformations, encephalitis, intracranial neoplasia, and pressure atrophy of the hypothalamus secondary to hydrocephalus. The dog in this report had an infiltrative neoplastic disorder, likely causing damage to the hypothalamic osmoreceptors responsible for the thirst generation. The neoplastic process was identified histopathologically as glioblastoma multiforme, an unusual tumor to occur in a dog this young. A tumor of the central nervous system causing physical destruction of the osmoreceptors has rarely been reported in dogs and none of the previously reported cases involved a glial cell tumor.
Paradigmas emergentes y crisis en la educación del Derecho: algo más que didácticas
Authors: Gómez Francisco Taeli
Published: August 2016

El artículo analiza la relación que existe hoy en día entre la enseñanza del derecho y la realidad social que rodea a esa enseñanza. Particularmente, se desglosa cómo se lleva cabo la tríada didáctica qué, cómo y para qué enseñar en las universidades chilenas actuales. El análisis presenta la existencia de una didáctica fosilizada del Derecho, basada en la enseñanza de la normativa jurídica y exenta de problematización y complejidad. Frente a esta situación, la propuesta es instaurar una nueva didáctica del derecho, concebida como actividad y no como trasvasije de conocimientos, la que, de esta manera, sería mucho más acorde con la riqueza de la sociedad actual.
Formación por competencias y enseñanza del Derecho
Authors: Aedo Barrena Cristián
Published: August 2016

El texto analiza las ventajas de la formación por competencias en el caso de la carrera de Derecho, a partir de la experiencia docente del autor, quien pone el énfasis en la necesidad de que la carrera se modernice y entregue a los estudiantes destrezas prácticas ligadas al ejercicio profesional. Desde la perspectiva de la enseñanza del Derecho, es fundamental contar con un currículum que efectivamente incorpore la noción de competencia y la desarrolle en todos sus aspectos (qué, cómo, cuándo enseñar y evaluar) de manera armónica, para que la enseñanza del Derecho vaya más allá de la clase tradicional.
Various systems in a single mathematical model
Authors: Geda Gábor
Published: August 2016

Our aim is to study differential equations and systems described by them which have great historical importance and are considered to be fundamental on different levels of education.
Due to their simplicity these are suitable for those who deal with this topic and want to gain useful experience in this field.
Furthermore, our aim is to give these equations a general form which facilitates the studying of the different models by computer even for an individual programmer. At the same time it facilitates the use of different mathematical auxiliary-programmes.
By giving the equations this way we get a chance of studying the relations between the individual systems.
Different approaches of interplay between experimentation and theoretical consideration in dynamic geometry exploration
Authors: Chan Yip-Cheung
Published: August 2016

Dynamic geometry environment (DGE) is a powerful tool for exploration and discovering geometric properties because it allows users to (virtually) manipulate geometric objects. There are two possible components in the process of exploration in DGE, viz. experimentation and theoretical consideration. In most cases, there is interplay between these two components. Different people may use DGE differently. Depending on the specific mathematical tasks and the background of individual users, some approaches of interplay are more experimental whereas some other approaches of interplay are more theoretical. In this paper, different approaches of exploring a geometric task using Sketchpad (a DGE) by three individual participants will be discussed. They represent three different approaches of interplay between experimentation and theoretical consid- eration. An understanding of these approaches may contribute to an understanding on the mechanism of exploration in DGE.
Decision based examination of object-oriented programming and Design Patterns
Authors: Márien Szabolcs
Published: August 2016

On the basis of our examination experience of Design Patterns the existing interpretations and descriptions of Design Patterns do not realise a clear and understandable answer for their aims. The reason for this is that the existing interpretation of the object-oriented paradigms is used for their description and formulation. In order that clear answers could be found for the aims of using Design Patterns, a new conception of their interpretation has to be established. In order to create a new conception, we have to analyze object-oriented paradigms.
According to our new conception the object-oriented methodology is based on the elimination of decision repetition, thus sorting the decisions to class hierarchy, with the help of which the data structure and methodology of decision options can be determined by the subclasses of the given class. Sorting the decisions and decision options to a class and its subclasses only the first decision case will be executed, which will be archived and enclosed by instantiation of one of the subclasses. For the following decision cases the archived decision result can be used without knowledge of which decision option was used, so to say which subclass was instantiated, because it is enclosed by using the type of the parent class.
The aim of the object-oriented technology is the elimination of decision repetition, which can be realized by sorting the decisions. The derivations are the abstract definitions of decisions, so the derivations can be interpreted as decision abstractions. The Design Patterns offer recipes for sorting the decisions. With the help of the decision concept the aim of Design Patterns can be cleared and a more natural classification of Design Patterns can be realized.
The inﬂuence of computer on examining trigonometric functions
Authors: Takači Djurdjica , Stojković Radivoje , Radovanović Jasminka
Published: August 2016

In this paper the influence of computer on examining trigonometric functions was analyzed throughout the results questionnaire. The students, as usual, had to examine two trigonometric functions, both were given with the appropriate instructions. Three groups were tested. Two of those three groups were prepared with the help of computer and the third one was taught without computer. From the analysis of the questionnaire it follows that the computer has a great influence on understanding of the connections between the graph and very complex calculations.
On an analogy between spreadsheets and dynamic geometry environments
Authors: Oldenburg Reinhard
Published: August 2016

There is a strong analogy between the fundamental way of operation of spreadsheet programs (SP) and dynamics geometry environments (DGE). We explain this analogy, demonstrate it in examples and consider didactical consequences.
Geometry expressions
Authors: Todd Philip
Published: August 2016

Dynamic geometry systems such as Geometers' SketchPad or Cabri are productive environments for the exploration of geometric relationships. They are, however, strictly numeric, and this limits their applicability where the interplay between geometry and algebra are being studied. We present Geometry Expressions – a dynamic symbolic geometry environment. While retaining the ease of use of a typical dynamic geometry environment, Geometry Expressions diverges by using constraints rather than constructions as the primary geometry specification mechanism and by working symbolically rather than numerically. Constraints, such as distances and angles, are specified symbolically. Symbolic measurements for quantities such as distances, angles, areas, locus equations, are automatically computed by the system. We outline how these features combine to create a rich dynamic environment for exploring the interplay between geometry and algebra, between induction and proof.
Proof step analysis for proof tutoring - a learning approach to granularity
Authors: Schiller Marvin , Dietrich Dominik , Benzmüller Christoph
Published: August 2016

We present a proof step diagnosis module based on the mathematical assistant system Ωmega. The task of this module is to evaluate proof steps as typically uttered by students in tutoring sessions on mathematical proofs. In particular, we categorise the step size of proof steps performed by the student, in order to recognise if they are appropriate with respect to the student model. We propose an approach which builds on reconstructions of the proof in question via automated proof search using a cognitively motivated proof calculus. Our approach employs learning techniques and incorporates a student model, and our diagnosis module can be adjusted to different domains and users. We present a first evaluation based on empirical data.
"Frontier algorithms"
Authors: Kátai Zoltán
Published: August 2016

In this paper we present a new method to compare algorithm design strategies. As in case of frontier towns the cultures blend, the so called "frontier algorithms" are a mixture of different programming techniques like greedy, backtracking, divide and conquer, dynamic programming. In case of some of them the frontier character is hidden, so it has to be discovered. There are algorithms that combine different techniques purposively. Furthermore, determining the programming technique the algorithm is using can be a matter of point of view. The frontier algorithms represent special opportunities to highlight particular characteristics of the algorithm design strategies. According to our experience the frontier algorithms fit best to the revision classes.
Comment les enseignants en formation initiale utilisent les technologies informatiques dans leurs classes
Authors: Abboud-Blanchard Maha , Fallot Jean-Paul , Lenfant Agnès , Parzysz Bernard
Published: August 2016

The research presented here deals with the way French pre-service teachers assimilate the working of technology tools and the effects on professional practice of integrating these tools into classes. We focused on the professional writings of pre-service teachers regarding the use of technology in their teaching. The results show that, besides official instructions, the motivations put forward by pre-service teachers who integrated technology in their classes are mainly their students' interest in computers and how powerful this tool is. They also show that in such an environment teachers tend to keep in the background and to leave the students to interact chiefly with the computer. We also noticed that the specificities of managing a classroom in computer environment are not taken into account unless they generate problems.
Résumé. La recherche présentée ici porte sur l'appropriation des outils informatiques par les enseignants français en formation initiale et les effets de leur intégration dans les classes sur les pratiques professionnelles. Nous avons pris comme objet d'étude des écrits professionnels, élaborés par ces professeurs stagiaires, portant sur l'utilisation des TIC dans leur enseignement. Les résultats obtenus font apparaître qu'outre les injonctions institutionnelles, les motivations invoquées par les stagiaires pour recourir à l'informatique concernent surtout l'attrait de leurs élèves pour l'ordinateur et la puissance de cet outil. Dans le cadre des usages en classe, nos résultats montrent que l'enseignant a tendance à s'effacer devant l'ordinateur, considéré comme l'interlocuteur privilégié de l'élève. Nous avons aussi pu constater que les spécificités de la gestion de la classe en environnement informatique ne sont prises en compte que lorsqu'elles se révèlent sources de problèmes.
Shall we use one more representation?
Authors: Sitkuné Görömbei Cecília
Published: August 2016

Among the most prominent developmental tasks of primary school education one finds increasing pupils' cognitive capacity with especial regard to observing, interpreting, coding and proving skills, which form an integral part of information and communication culture.
Info-technology (problem solving with the tools and methods of informatics), a subject matter within informatics, provides outstanding opportunities to reach the aims outlined above.
This study presents methodological ideas related to the subfield Algorithmization and data modelling of Info-technology. More specifically, it presents teaching methods to be applied while establishing the notion of recursion in grades 3–8 of primary education, and at the same time it also focuses on various realization possibilities of the prominent developmental tasks mentioned above.
The single-source shortest paths algorithms and the dynamic programming
Authors: Kátai Zoltán
Published: August 2016

In this paper we are going to present a teaching—learning method that help students look at three single-source shortest paths graph-algorithms from a so called "upperview": the algorithm based on the topological order of the nodes, the Dijkstra algorithm, the Bellman-Ford algorithm. The goal of the suggested method is, beyond the presentation of the algorithms, to offer the students a view that reveals them the basic and even the slight principal differences and similarities between the strategies. In order to succeed in this object, teachers should present the mentioned algorithms as cousin dynamic programming strategies.
GeoGebra in mathematics teaching
Authors: Papp-Varga Zsuzsanna
Published: August 2016

GeoGebra is a dynamic mathematics software which combines dynamic geometry and computer algebra systems into an easy-to-use package. Its marvel lies in the fact that it offers both the geometrical and algebraic representation of each mathematical object (points, lines etc.). The present article gives a sample of the potential uses of GeoGebra for mathematics teaching in secondary schools.
Report on INFODIDACT 2008 - the First National Conference on Didactics of Informatics
Authors: Juhász Katalin , Zsakó László
Published: August 2016

Acquiring a PhD in any subject has been possible only in the last twentish years in Hungary. To take degree in didactics, especially didactics of informatics is still very difficult. There are not enough forums for the PhD students where they could report of their research work and results.
Reflecting upon reflections
Authors: Zeitler H. , Camp D.
Published: August 2016

This paper considers many applications of reflections in geometry. It begins with a few motivational problems for the classroom and goes on to consider the formal application to cases involving reflections across one line, two lines and three lines. It wraps up with a summary of results for reflections in higher orders.
All this stuff was treated in German and American schools too – so the paper is a typical example of German-American didactics.
"Thinking is one of the greatest pleasure of mankind." – Galileo Galilei
Forming the concept of parameter with examples of problem solving
Authors: Wadoń-Kasprzak Katarzyna
Published: August 2016

Pupils are encountering difficulties with learning algebra. In order for them to understand algebraic concepts, particularly the concept of parameter it was decided by the teacher of mathematics and Information Technology to integrate the teaching of these two subjects. The aim of this study is to investigate whether, and to what degree, software can be useful in process of forming the concept of parameter. This longitudinal study was conducted in a junior high school (13-16 year old children) using different computer programs.
Cognitive conflict as a tool of overcoming obstacles in understanding infinity
Authors: Cihlář Jiří , Eisenmann Petr , Krátká Magdalena , Vopĕnka Petr
Published: August 2016

This paper, based on current research, is devoted to obstacles that appear in the process of understanding the concept of infinity. In its introductory part the fundamental types of epistemology obstacles are formulated. The cognitive conflict and its role in overcoming these obstacles are analysed in the following section of this research. Finally, the authors focus on research methodology and the results of the three-year research project. The problems are illustrated by means of real experimental interviews.
A multifunctional GH39 glycoside hydrolase from the anaerobic gut fungusOrpinomycessp. strain C1A
Authors: Morrison Jessica M. , Elshahed Mostafa S. , Youssef Noha
Published: August 2016

Background.The anaerobic gut fungi (phylum Neocallimastigomycota) represent a promising source of novel lignocellulolytic enzymes. Here, we report on the cloning, expression, and characterization of a glycoside hydrolase family 39 (GH39) enzyme (Bgxg1) that is highly transcribed by the anaerobic fungusOrpinomycessp. strain C1A under different growth conditions. This represents the first study of a GH39-family enzyme from the anaerobic fungi.

Methods.Using enzyme activity assays, we performed a biochemical characterization of Bgxg1 on a variety of substrates over a wide range of pH and temperature values to identify the optimal enzyme conditions and the specificity of the enzyme. In addition, substrate competition studies and comparative modeling efforts were completed.

Results.Contrary to the narrow range of activities (β-xylosidase or α-L-iduronidase) observed in previously characterized GH39 enzymes, Bgxg1 is unique in that it is multifunctional, exhibiting strong β-xylosidase, β-glucosidase, β-galactosidase activities (11.5 ± 1.2, 73.4 ± 7.15, and 54.6 ± 2.26 U/mg, respectively) and a weak xylanase activity (10.8 ± 1.25 U/mg), as compared to previously characterized enzymes. Further, Bgxg1 possesses extremely high affinity (as evident by the lowestKmvalues), compared to all previously characterized β-glucosidases, β-galactosidases, and xylanases. Physiological characterization revealed that Bgxg1 is active over a wide range of pH (3–8, optimum 6) and temperatures (25–60 °C, optimum 39 °C), and possesses excellent temperature and thermal stability. Substrate competition assays suggest that all observed activities occur at a single active site. Using comparative modeling and bioinformatics approaches, we putatively identified ten amino acid differences between Bgxg1 and previously biochemically characterized GH39 β-xylosidases that we speculate could impact active site architecture, size, charge, and/or polarity.

Discussion.Collectively, the unique capabilities and multi-functionality of Bgxg1 render it an excellent candidate for inclusion in enzyme cocktails mediating cellulose and hemicellulose saccharification from lignocellulosic biomass.
Highly Efficient Coaxial TiO2‐PtPd Tubular Nanomachines for Photocatalytic Water Purification with Multiple Locomotion Strategies
Authors: Mushtaq Fajer , Asani Agim , Hoop Marcus , Chen Xiang‐Zhong , Ahmed Daniel , Nelson Bradley J. , Pané Salvador
Published: August 2016

Titania is a promising photocatalyst for water purification or production of solar fuels. However, due to its large band gap, titania is photoactive solely under UV light, which accounts for less than 5% of the solar spectrum. In this work, TiO2‐based hybrid 1D nanostructures with photocatalytic activities extended to visible light region are designed and fabricated. Highly efficient coaxial TiO2‐PtPd‐Ni nanotubes (NTs) are fabricated by a template‐assisted electrochemical synthesis route for water remediation under UV light, visible light, and natural sunlight. These coaxial hybrid nanotubes display a 100% degradation of organic pollutant rhodamine B in only 50 min (k‐value 0.071 min−1) and 30 min under visible light and natural sunlight, respectively. For comparison, TiO2 nanotubes doped with Pd nanoparticles are also fabricated and they show inferior photocatalytic properties and degrading stability over time. The multicomponent design enables to actuate the hybrid NTs by using two different external energy sources, i.e., magnetic and acoustic fields. Self‐propelled, autonomous actuation in the presence of H2O2 is also realized. These versatile actuation modes have the potential to enable the reported photocatalytic nanomachines to work efficiently under complex environments and to be easily collected for reuse.
Iron‐Catalyzed Azidoalkylthiation of Alkenes with Trimethylsilyl Azide and 1‐(Alkylthio)pyrrolidine‐2,5‐diones
Authors: Yu Jipan , Jiang Min , Song Zhixuan , He Tiancheng , Yang Haijun , Fu Hua
Published: August 2016

A simple, efficient and practical iron‐catalyzed azidoarylthiation of alkenes has been developed at room temperature, and the corresponding products containing ortho‐sited sulfide and azide units were obtained in moderate to good yields with good tolerance of functional groups. The protocol uses readily available 1‐(alkylthio)pyrrolidine‐2,5‐diones and trimethylsilyl azide as the alkylthiation and azidation reagents, respectively, inexpensive and environmentally friendly iron chloride as the catalyst without addition of any ligand and additive.

magnified image
Synthesis of Tricyclic Isoquinoline Derivatives via Palladium‐ Catalyzed Tandem Reactions of 2,7‐Alkadiynylic Carbonates with 2,3‐Allenyl Sulfamides
Authors: Huang Xin , Wu Wangteng , Song Shihua , Fu Chunling , Ma Shengming
Published: August 2016

The palladium‐catalyzed tandem reactions of 2,7‐alkadiynylic carbonates with 2,3‐allenyl sulfamides for the syntheses of fused tricycles such as 1,3,6,7,8,9‐hexahydrofuro[3,4‐h]isoquinoline, 2,3,6,7,8,9‐hexahydro‐1H‐pyrrolo[3,4‐h]isoquinoline, and 2,3,4,7,8,9‐hexahydro‐1H‐cyclopenta[h]isoquinoline derivatives have been developed. A mechanism has been proposed based on the isolation of a by‐product.

magnified image
Iodine‐Mediated Aryl C−H Amination for the Synthesis of Benzimidazoles and Pyrido[1,2‐a]benzimidazoles
Authors: Lv Zhigang , Liu Jing , Wei Wei , Wu Jie , Yu Wenquan , Chang Junbiao
Published: August 2016

An intramolecular aryl C−H amination reaction has been achieved using molecular iodine as the sole oxidant for the synthesis of benzimidazole derivatives. The required substrates were readily prepared by addition or coupling of arylamines with the corresponding nitriles or aryl iodides. Iodine‐mediated oxidative cyclization of these substrates in the presence of potassium carbonate (K2CO3) as base afforded the corresponding products in moderate to good yields. The transition metal‐free protocol presented here is insensitive to air and operationally simple. This versatile and eco‐friendly synthetic methodology is broadly applicable to a variety of N‐aryl‐substituted amidines and pyridin‐2‐amines, and provides direct access to both 1H‐benzo[d]imidazole and pyrido[1,2‐a]benzimidazole derivatives from the corresponding precursors.

magnified image
Phosphorylation of Glycine Derivatives via Copper(I)‐Catalyzed Csp3−H Bond Functionalization
Authors: Zhi Huizhen , Ung Sosthene Pierre‐Marie , Liu Yun , Zhao Liang , Li Chao‐Jun
Published: August 2016

A simple and efficient one‐pot approach has been developed for a copper‐catalyzed phosphorylation of glycine derivatives under air and at room temperature. The present cross‐dehydrogenative coupling allows various methoxyphenyl‐protected glycine derivatives to be phosphorylated using diverse alkyl and aryl phosphites through an oxidative coupling between Csp3−H and P−H bonds catalyzed by copper iodide. This method provides a new synthetic tool to obtain biologically active α‐aminophosphonates.

magnified image
Syringomyelia in hereditary multiple exostosis
Authors: Legare Janet M. , Modaff Peggy , Iskandar Bermans J. , Pauli Richard M.
Published: August 2016

We describe five children with Hereditary Multiple Exostosis (HME) who also had syringomyelia. Of these, four had a tethered cord/fibrolipoma. No spinal osteochondromas were found in these patients. All had antecedent neurological signs or symptoms that prompted spinal imaging with MRI. Of all patients with HME seen in the Midwest Regional Bone Dysplasia Clinic from 1982 to present, 44% (17/39) of patients had signs or symptoms concerning for possible cord‐related neurological findings. However, only 10 of 39 had spinal imaging. Assuming that all individuals with syringomyelia were identified, then 5/39 (13%) were in that way affected. This, of course, is a minimal estimate given that many were not imaged. The incidence of syringomyelia appears to be increased in this population, and seems to be unrelated to spinal osteochondromas. A low threshold for obtaining spinal MRI in patients with Hereditary Multiple Exostosis seems rational. © 2016 Wiley Periodicals, Inc.
Alkyne Metathesis with Silica‐Supported and Molecular Catalysts at Parts‐per‐Million Loadings
Authors: Estes Deven P. , Bittner Celine , Àrias Òscar , Casey Martin , Fedorov Alexey , Tamm Matthias , Copéret Christophe
Published: August 2016

Improvement of the activity, stability, and chemoselectivity of alkyne‐metathesis catalysts is necessary before this promising methodology can become a routine method to construct C≡C triple bonds. Herein, we show that grafting of the known molecular catalyst [MesC≡Mo(OtBuF6)3] (1, Mes=2,4,6‐trimethylphenyl, OtBuF6=hexafluoro‐tert‐butoxy) onto partially dehydroxylated silica gave a well‐defined silica‐supported active alkyne‐metathesis catalyst [(≡SiO)Mo(≡CMes)(OtBuF6)2] (1/SiO2‐700). Both 1 and 1/SiO2‐700 showed very high activity, selectivity, and stability in the self‐metathesis of a variety of carefully purified alkynes, even at parts‐per‐million catalyst loadings. Remarkably, the lower turnover frequencies observed for 1/SiO2‐700 by comparison to 1 do not prevent the achievement of high turnover numbers. We attribute the lower reactivity of 1/SiO2‐700 to the rigidity of the surface Mo species owing to the strong interaction of the metal site with the silica surface.
Regiodivergent Intermolecular [3+2] Cycloadditions of Vinyl Aziridines and Allenes: Stereospecific Synthesis of Chiral Pyrrolidines
Authors: Lin Tao‐Yan , Zhu Chao‐Ze , Zhang Peichao , Wang Yidong , Wu Hai‐Hong , Feng Jian‐Jun , Zhang Junliang
Published: August 2016

The first rhodium‐catalyzed intermolecular [3+2] cycloaddition reaction of vinyl aziridines and allenes for the synthesis of enantioenriched functionalized pyrrolidines was realized. [3+2] cycloaddition with the proximal C=C bond of N‐allenamides gave 3‐methylene‐pyrrolidines in high regio‐ and diastereoselectivity, whereas, 2‐methylene‐pyrrolidines were obtained as the major products by the cycloadditions of vinyl aziridines with the distal C=C bond of allenes. Use of readily available starting materials, a broad substrate scope, high selectivity, mild reaction conditions, as well as versatile functionalization of the cycloadducts make this approach very practical and attractive.
Verzweigte Arylalkene aus Zimtsäuren: Selektivitätsumkehr in Heck‐Reaktionen durch Carboxylate als abfallende dirigierende Gruppen
Authors: Tang Jie , Hackenberger Dagmar , Goossen Lukas J.
Published: August 2016

In einer decarboxylierenden Mizoroki‐Heck‐Reaktion von Arylhalogeniden mit Zimtsäuren dirigiert die Carboxylatgruppe die Arylierung in β‐Position, bevor sie rückstandslos über eine Protodecarboxylierung entfernt wird. Unter Verwendung eines Kupfer/Palladium‐Katalysators können elektronenreiche wie ‐arme Arylbromide und ‐chloride mit verschiedenen funktionellen Gruppen mit breit verfügbaren Zimtsäuren selektiv zu 1,1‐disubstituierten Alkenen umgesetzt werden. Dieses Reaktionskonzept ergänzt hervorragend die traditionellen, 1,2‐selektiven Heck‐Reaktionen von Styrolen.
Morphological investigation of cellulose acetate/cellulose nanocrystal composites obtained by melt extrusion
Authors: Leite Liliane Samara Ferreira , Battirola Liliane Cristina , da Silva Laura Caetano Escobar , Gonçalves Maria do Carmo
Published: August 2016

Composites were prepared from cellulose acetate (CA) and cellulose nanocrystals (CNC) by melt extrusion using two methods for the introduction of CNC: direct mixing and predispersion in CA solution. CNC were isolated using hydrochloric acid to increase thermal stability allowing the composites to be processed above 150 °C. The effect of CNC dispersion on the composites morphology, thermal, and mechanical properties was investigated. Field emission scanning electron microscopy and transmission electron microscopy results indicated that the predispersion method allows better CNC dispersion and distribution when compared to the direct mixture method. In addition, predispersion promotes preferential CNC orientation in relation to the injection flow. The predispersion method also showed a 14% Young's modulus increase in composites containing 15 wt % CNC while no significant change was observed when using the direct mixing. The results obtained in this work show that, to achieve the percolation threshold, nanoparticle distribution is as important as their content. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44201.
Lanthanide Organic Framework Luminescent Thermometers
Authors: Rocha João , Brites Carlos D. S. , Carlos Luís D.
Published: August 2016

Metal–organic frameworks (MOFs) are excellent platforms for engineering luminescence properties as their building blocks, metal ions, linkers, and guest ions or molecules, are all potential sources of light emission. Temperature is one of the most important physical properties affecting the dynamics and viability of natural and engineered systems. Because the luminescence of certain lanthanide‐bearing MOFs changes considerably with temperature, in the last few years, these materials have been explored as optical thermometers, especially in temperature sensing based on the intensity ratios of two separate electronic transitions. This review discusses the main concepts and ideas assisting the design of such ratiometric thermometers, and identifies the main challenges presented to this nascent field: develop nanothermometers for bio‐applications and nanomedicine; understand the energy transfer mechanisms determining the thermal sensitivity; achieve effective primary thermometers; realize multifunctional nanothermometers; integrate Ln3+‐based thermometers in commercial products.