bluuebunny/crossref_metadata_2025_split huggingface dataset:
Resiliência educacional e construção do conhecimento
Authors: Sousa Carolina Silva , Guerreiro António 
Published: November 2014

http://dx.doi.org/10.5902/1984644414343O artigo debruça-se sobre a resiliência académica, com ênfase na construção progressiva da comunicação matemática, em aulas dos primeiros anos de escolaridade, em Portugal, em resultado dos processos de interação social entre os alunos e entre estes e o professor. Trata-se de uma dinâmica educativa que resultou numa crescente valorização e reconhecimento dos conhecimentos matemáticos dos alunos, num contexto comunicativo com uma abordagem reflexiva e instrutiva, enquadrando-se no papel primordial de novas formas de aprendizagem e de novas estratégias, bem como do aumento e fortalecimento de competência na resolução de problemas. Neste enquadramento, os investigadores, partindo dos relacionamentos interpessoais, da empatia, das competências sociais e do senso de pertença a um grupo na interface com a resiliência social e a emocional, destacam a importância das experiências positivas ao gerarem sentimentos de autoeficácia, de autoestima e de sucesso académico, por parte de alunos e de professores, contribuindo para os ajudar a saberem lidar com as mudanças e com as adaptações a novas situações de aprendizagem, em que o fator comunicacional é da maior relevância.
A poética e a política da prática
Authors: Kisliuk Michelle 
Published: November 2014

http://dx.doi.org/10.5902/1984644414780O presente ensaio, de caráter etnográfico, discorre sobre a relação entre poética e política na performance; parte do pressuposto que as artes ativistas, tais como a música e a dança podem constituir, junto à escolarização, a base política, intelectual e estética de uma dada comunidade. Tais práticas, contudo, apresentam-se como sendo de risco. O texto realiza, ainda, uma tentativa de aproximação entre tais práticas – no que se refere à sua função e consequências - no contexto de uma comunidade africana e em instituições de ensino superior nos Estados Unidos. A escrita interativa e performativa pretende, ao fim e ao cabo, materializar um intercâmbio entre pesquisador de campo e as pessoas com quem trabalha, como também, representar e evocar o material e as ideias de que trata a pesquisadora.
Inherited hypoxia: A new challenge for reoligotrophicated lakes under global warming
Authors: Jenny Jean‐Philippe , Arnaud Fabien , Alric Benjamin , Dorioz Jean‐Marcel , Sabatier Pierre , Meybeck Michel , Perga Marie‐Elodie 
Published: November 2014

AbstractThe Anthropocene is characterized by a worldwide spread of hypoxia, among other manifestations, which threatens aquatic ecosystem functions, services, and biodiversity. The primary cause of hypoxia onset in recent decades is human‐triggered eutrophication. Global warming has also been demonstrated to contribute to the increase of hypoxic conditions. However, the precise role of both environmental forcings on hypoxia dynamics over the long term remains mainly unknown due to a lack of historical monitoring. In this study, we used an innovative paleolimnological approach on three large European lakes to quantify past hypoxia dynamics and to hierarchies the contributions of climate and nutrients. Even for lake ecosystems that have been well oxygenated over a millennia‐long period, and regardless of past climatic fluctuations, a shift to hypoxic conditions occurred in the 1950s in response to an unprecedented rise in total phosphorus concentrations above 10 ± 5 µg P L−1. Following this shift, hypoxia never disappeared despite the fact that environmental policies succeeded in drastically reducing lake phosphorus concentrations. During that period, decadal fluctuations in hypoxic volume were great, ranging between 0.5 and 8% of the total lake volumes. We demonstrate, through statistical modeling, that these fluctuations were essentially driven by climatic factors, such as river discharge and air temperature. In lakes Geneva and Bourget, which are fed by large river systems, fluctuations in hypoxic volume were negatively correlated with river discharge. In contrast, the expansion of hypoxia has been related only to warmer air temperatures at Annecy, which is fed by small river systems. Hence, we outline a theoretical framework assuming that restored lake ecosystems have inherited hypoxia from the eutrophication period and have shifted to a new stable state with new key controls of water and ecosystem quality. We suggest that controlling river discharge may be a complementary strategy for local management of lakes fed by large river systems.
Land surface energy partitioning revisited: A novel approach based on single depth soil measurement
Authors: Yang Jiachuan , Wang Zhi‐Hua 
Published: November 2014

AbstractThe partitioning of solar energy into sensible, latent, and ground heat fluxes over the land surface is responsible for changes of state variables in the soil‐atmosphere system. Recent research enables the reconstruction of the land surface temperature and ground heat flux using Green's function approach, as well as the estimate of the distribution of available energy into latent and sensible heat fluxes based on linear stability analysis. Combining the Green's function approach and linear stability analysis, we propose a new physically based numerical procedure to estimate the land surface energy partitioning in this paper. The new method is capable of predicting all surface energy budgets using a single depth soil measurement; the model reliability is evaluated with comparisons to flux tower measurements. The results of this study deepen our insight into the implicit link between surface energy partition and subsurface soil dynamics and how the link can be employed to related research areas.
The changing roles of iron and vertical mixing in regulating nitrogen and silicon cycling in the Southern Ocean over the last glacial cycle
Authors: Robinson Rebecca S. , Brzezinski Mark A. , Beucher Charlotte P. , Horn Matthew G. S. , Bedsole Patrick 
Published: November 2014

AbstractThe Southern Ocean plays a critical role in the air‐sea CO2 balance through biological and physical mechanisms. Vertical supply of deep waters returns nutrients and CO2 to the surface and stimulates phytoplankton growth. Photosynthesis in the Southern Ocean is limited by iron and only a fraction of the carbon and nutrients that return to the surface are consumed for potential sequestration in the deep sea. Here we present the most spatially extensive data set of silicon and nitrogen isotope measurements from diatom frustules to date to examine the controls on nutrient drawdown during the last glacial period and across the glacial termination in both the Antarctic and Subantarctic zones. The new data confirm existing views that differing silicon and nitrate consumption patterns in the Antarctic zone are likely the result, at least in part, of iron addition during the last glacial maximum (LGM). However, earlier in the glacial, a more coordinated response in the two proxy records, with both reflecting enhanced consumption during episodes of increased iron accumulation and export production, implies a different system response than observed for the LGM. A collapse of the expected equatorward gradient in silicon isotope values and contraction of the nitrogen isotope gradient during the deglaciation suggests that nutrient supply increased not only in the Antarctic Zone, but also in the Subantarctic, perhaps due to enhanced deep mixing locally. Enhanced deep water ventilation across the Southern Ocean likely increased the nutrient content of mode waters during the deglaciation.
Robust Control for a Class of Uncertain Switched Fuzzy Systems with Saturating Actuators
Authors: Luo Jinming , Zhao Jun 
Published: November 2014

AbstractThis paper investigates the robust control problem for a class of uncertain switched fuzzy systems with saturating actuators. The asymptotical stability for fuzzy subsystems subject to actuator saturation is not assumed. Based on the multiple Lyapunov functions method, we design a switching law and a state feedback control law such that the closed‐loop system is asymptotically stable. Additionally, the estimation of the domain of attraction is presented by solving an optimization problem. Finally, simulation results verify the feasibility and effectiveness of the proposed method.
Dr. Earl N. Meyer, in the lab, with a scalpel: A murder mystery as a biochemistry recruitment tool
Authors: Vulcu Felicia , Heirwegh Meagan 
Published: November 2014

AbstractIncreasing student participation in science is an ongoing challenge for many universities. In this active learning workshop, centered on inquiry and teamwork, we introduce high‐school students to biochemistry and molecular biology techniques using a murder mystery activity. During this intensive 3 hr workshop, we engage students in a murder scenario entitled “The Case of the Silenced Scientist.” A commercially available DNA fingerprinting kit was used as a basis to create a customized scenario whereby students collaborate with one another to solve a murder mystery. Through analysis of DNA samples taken from the crime scene and suspects, students can identify the murderer while developing technical, teamwork, and critical thinking skills. Emphasis is placed on teamwork by immersing students in the collaborative process of research inquiry. Though short in duration, this workshop aims to build student relationships to science through creativity and exploration. In this article, we describe the key customized applications of this workshop as a blueprint for science recruitment. We focus on the workshop facilitators' perceived learning impact on students. © 2014 by The International Union of Biochemistry and Molecular Biology, 43(1):20–27, 2015.
Assessing the engagement, learning, and overall experience of students operating an atomic absorption spectrophotometer with remote access technology
Authors: Erasmus Daniel J. , Brewer Sharon E. , Cinel Bruno 
Published: November 2014

AbstractThe use of internet‐based technologies in the teaching of laboratories has emerged as a promising education tool. This study evaluated the effectiveness of using remote access technology to operate an atomic absorption spectrophotometer in analyzing the iron content in a crude myoglobin extract. Sixty‐two students were surveyed on their level of engagement, learning, and overall experience. Feedback from students suggests that the use of remote access technology is effective in teaching students the principles of chemical analysis by atomic absorption spectroscopy. © 2014 by The International Union of Biochemistry and Molecular Biology, 43(1):6–12, 2015.
Selective Electrocatalytic Oxidation of Sorbitol to Fructose and Sorbose
Authors: Kwon Youngkook , de Jong Ed , van der Waal Jan Kees , Koper Marc T. M. 
Published: November 2014

AbstractA new electrocatalytic method for the selective electrochemical oxidation of sorbitol to fructose and sorbose is demonstrated by using a platinum electrode promoted by p‐block metal atoms. By the studying a range of C4, C5 and C6 polyols, it is found that the promoter interferes with the stereochemistry of the polyol and thereby modifies its reactivity.
Electroanalytical Behavior of Gallic and Ellagic Acid Using Graphene Modified Screen‐Printed Electrodes. Method for the Determination of Total Low Oxidation Potential Phenolic Compounds Content in Cork Boiling Waters
Authors: Guiberteau‐Cabanillas Agustina , Godoy‐Cancho Belén , Bernalte Elena , Tena‐Villares Miriam , Guiberteau Cabanillas Carmen , Martínez‐Cañas Manuel A. 
Published: November 2014

AbstractNew electroanalytical methods have been proposed for the estimation of the total content of phenolic compounds of low oxidation potential in cork boiling water, expressed as gallic acid equivalent/g dry cork, by using screen‐printed electrode modified with graphene. The results obtained have been compared with spectrophotometric method (Folin‐Ciocalteau) and a good correlation has been found between them. The detection limits obtained by Winefordner‐Long and Clayton methods were 0.04 and 0.06 ppm for ellagic acid (EA), and 0.05 and 0.09 ppm for gallic acid (GA), respectively. The sensitivity, simplicity, selectivity, fast and low cost of the developed methodologies is also demonstrated.
Therapy‐related peripheral neuropathy in multiple myeloma patients
Authors: Morawska Marta , Grzasko Norbert , Kostyra Magdalena , Wojciechowicz Jolanta , Hus Marek 
Published: November 2014

AbstractThis review discusses the most common issues concerning multiple myeloma (MM)‐related peripheral neuropathy (PN). This is an important MM complication, observed in up to 54% of newly diagnosed patients, caused by the disease itself or its treatment. Although its aetiology is largely unknown, a number of mechanisms are suspected. It is important to know the neurological status of a patient, as many new antimyeloma medicines can trigger or exacerbate any pre‐existing neuropathy. Examples include thalidomide‐induced and bortezomib‐induced PN (TiPN and BiTN, respectively), which are key MM treatment options. TiPN is usually sensory and sensorimotor, whereas BiPN is typically sensory. The mechanisms of chemotherapy‐induced neurotoxicity in MM are well known; thalidomide seems to induce PN through its antiangiogenic properties, whereas bortezomib neurotoxicity is connected with disrupted calcium homeostasis. TiPN incidence ranges from 25% to 75%, and its prevalence and severity appears to be dose‐dependent. BiPN incidence is almost 40% and is dose‐related as well. Poor (25%) reversibility of TiPN prompted the recommendations for dose and exposure reduction, whereas BiPN cases are mostly reversible (64%). Peripheral sensory neuropathy is very rare in patients receiving bendamustine monotherapy. Because of this favourable toxicity profile, bendamustine may be considered a promising option for combination therapies in pre‐existing PN in myeloma patients. Considering the lack of curative therapy for treatment‐emergent PN, prevention is a key management strategy in MM patients. All patients should be evaluated for PN before the administration of a neurotoxic drug, and those under treatment should be closely monitored by a neurologist. Copyright © 2014 John Wiley & Sons, Ltd.
Characterisation of cherts from sites in southwest Tasmania
Authors: Sheppard Peter J. 
Published: November 2014

AbstractThis paper reports on the characterisation, using thin section petrography and Instrumental Neutron Activation Analysis, of cherts recovered from Pleistocene sites (Bone Cave, Warreen, Pulawa Trounta and Nunamira) located in the interior of Southwest Tasmania. The results indicate use of one major chert source area and fit a simple distance fall‐off model. These results are congruent with palaeo‐ecological models previously developed for Southwestern Tasmania (Cosgrove 1995; Cosgrove, Allen and Marshall 1990).
Anthropogenic factors and prehistoric dog morphology: a case study from Polynesia
Authors: Clark Geoffrey R. 
Published: November 2014

AbstractThis study of a prehistoric Polynesian commensal, using data from New Zealand and Hawaiian dogs, identifies significant skeletal differences between and within the populations. Genetic, environmental and anthropogenic factors are discussed to account for the differences. It is suggested that anthropogenic factors are an important influence on the commensal's skeleton.
Amino acid analysis of food residues in pottery: a field and laboratory study
Authors: Fankhauser Barry 
Published: November 2014

AbstractWhen food is cooked in a clay pot, traces remain within the fabric and in charred deposits on the walls of the vessel. To better define the parameters of food deposits in pottery, field research was carried out in Papua New Guinea (PNG) on cooking methods and pottery making as they relate to organic residues. Samples of common foods, pottery with known residues, and newly made pottery for laboratory studies were collected and analysed for amino acids using high performance liquid chromatography. The background amino acid content of fired pottery was found to be negligible compared to food residues incorporated into the vessel walls during cooking. Mainly free amino acids are absorbed into the pot matrix when foods are boiled. It is these amino acids which must be analysed when making comparisons to food standards. Amino acid results for food residues and foods cooked in the laboratory duplicated those from samples obtained in PNG. Ageing studies carried out under varying conditions on food and food residues within the pottery fabric found that amino acids were quite stable especially under dry ageing conditions.
Amino acid racemisation and radiocarbon dating of a contact period midden, Greenglade rockshelter, New South Wales
Authors: Murray‐Wallace Colin V. , Colley Sarah M. 
Published: November 2014

AbstractThe extent of racemisation of one of the fastest racemising amino acids, aspartic acid, in the marine gastropod Turbo undulatus from Greenglade rockshelter, southern New South Wales, is examined in an attempt to resolve time within the last few hundred years, an interval that is difficult to date by radiocarbon. Aspartic acid racemisation, in conjunction with radiocarbon dating and stratigraphic evidence, indicates that Greenglade rockshelter was occupied episodically since AD 1300. The variation in the amino acid results obtained in this study help to define the limitations of applying the amino acid racemisation (AAR) method to middens of recent origin. Comparison of AAR analyses on shell of equivalent age and known not to have been burnt, suggests that some of the shells within the middens have been reworked and/or heated during multiple episodes of rockshelter occupation. Cultural evidence indicates that the rockshelter was used until historically‐recent times, well after British colonisation and possibly as late as the middle twentieth century. The difficulties of dating this interval are also considered in the context of the contact period in Australia. It is concluded that dating midden materials of recent age, known to have been heated by camp fires, is a particularly difficult task by the AAR method, but that meaningful results may be obtained if the technique is used with caution.
Navatanitawake ceremonial mound, Bau, Fiji: some results of 1970 investigations
Authors: Parke Aubrey 
Published: November 2014

AbstractThis paper records results from the archaeological investigations of a major ceremonial mound in Fiji, on the island of Bau. Discoveries included the human skeletal remains of at least 17 individuals, showing a variety of mortuary practices, three hearths, and associated sherds of elaborately decorated pottery and other artefacts. Excavation indicated that the double‐platform mound had been constructed in two phases. These discoveries can be correlated with early written accounts and current oral traditions relating to the rise to power of the Vunivalu or secular war chief of the confederacy of Bau and particularly to the battle of Kaba in 1855 and the burial on Bau of Tongan warriors killed during the battle.
Pleistocene Aboriginal occupation at Cania Gorge, Central Queensland: preliminary results of fieldwork
Authors: Lilley Ian , Brian Deborah , Clarkson Chris , Ulm Sean 
Published: November 2014

AbstractRecent excavations at Cania Gorge in central Queensland have revealed evidence for Aboriginal occupation dating from the late Pleistocene through to the historical period. This paper briefly describes the general aims of the project as well as several of the key sites excavated, and reports initial radiocarbon determinations. These excavations were conducted as part of the Gooreng Gooreng Cultural Heritage Project, which is being undertaken in collaboration with the Gurang Land Council Aboriginal Corporation (see Clarkson et al. in prep.; Jolly 1994; Lilley and Ulm 1995; Lilley et al. 1996; Lilley et al. in press).
New radiocarbon determinations from the Grampians‐Gariwerd region, western Victoria
Authors: Bird C.F.M. , Frankel David , van Waarden Nora 
Published: November 2014

AbstractNew radiocarbon determinations have been obtained for four rockshelter sites in the Grampians‐Gariwerd region, originally excavated in the 1970s and early 1980s by the Victoria Archaeological Survey. Basal dates of about 22,000 BP for Drual and evidence of occupation below a date of about 9000 BP for Billimina indicate that the ranges were first occupied during the Late Pleistocene. These results have considerable implications for the interpretation of the archaeological record of Western Victoria.
The specificities of the ‘Southern Lapita Province’: the New Caledonian case
Authors: Sand Christophe 
Published: November 2014

AbstractNew studies on the Lapita phenomenon in New Caledonia have led to the identification of local patterns that allow the outlining of the concept of a ‘Southern Lapita Province‘, recently proposed by Kirch (1997). By defining the chronological limits and the typological characteristics of the dentate, non‐dentate and undecorated Lapita ware, and the forms of the non‐ceramic material, this paper makes a preliminary study of the local differences of the Lapita cultural complex in Southern Melanesia.
Provenience analysis of pottery from Fijian hillforts: preliminary implications for exchange within the archipelago
Authors: Bentley R. Alexander 
Published: November 2014

AbstractSurface finds of pottery from hillforts in the Yasawas Islands were examined by neutron activation analysis (NAA) and by petrographic analysis. The NAA results show that pottery from the Yasawas falls into at least three distinct compositional groups. Petrographic comparison and a pilot study by Inductively Coupled Plasma Mass Spectrometry (ICP‐MS) shows pottery from the lower Singatoka valley to have a composition similar to a group of Yasawas pottery, indicating exchange between the two areas. The evidence for pottery exchange is consistent with dialect similarity evidence that Western Fiji evolved as a separate sphere of interaction from the rest of Fiji.
Evolutions in the Lapita Cultural Complex: a view from the Southern Lapita Province
Authors: Sand Christophe 
Published: November 2014

AbstractThis paper discusses differences in the settlement strategies and cultural evolutions developed during the Lapita period, by comparing expansion and transformation processes identified in Southern Melanesia, particularly New Caledonia, with the wider regional data.Entering a region devoid of malaria and in some cases with geologically complex landforms, the Austronesian colonists, who arrived about 1000 BC, developed specific trends of the Lapita Cultural Complex, which can be characterized as a regional Southern Province. I first present a general background of the Lapita period in New Caledonia, focussing on chronology, geographical spread and the major characteristics of the postulated Southern Province. This allows the identification of cultural developments internal to the Lapita period of New Caledonia that are significant for understanding changes and relationships between the different Lapita Provinces. Discussion mainly points to sources of cultural origin, rates of first settlement and regional transformations, and local relations between the islands.