bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the nature of teaching nature of science: Preservice early childhood teachers' instruction in preschool and elementary settings
Authors: Akerson Valarie L. , Buzzelli Cary A. , Donnelly Lisa A. 
Published: November 2009

AbstractThis study explored whether early childhood preservice teachers' concerns about teaching nature of science (NOS) and their intellectual levels influenced whether and how they taught NOS at the preschool and primary (K‐3) levels. We used videotaped classroom observations and lesson plans to determine the science instructional practices at the preschool and primary levels, and to track whether and how preservice teachers emphasized NOS. We used the Stages of Concern Questionnaire (SOCQ) pre‐ and postinternship to determine concerns about NOS instruction, and the Learning Context Questionnaire (LCQ) to determine intellectual levels. We found that neither concerns about teaching NOS nor intellectual level were related to whether and how the preservice teachers emphasized NOS; however, we found that all preservice early childhood teachers began their internships with NOS concern profiles of “worried.” Two preservice teachers' NOS concerns profiles changed as a result of their internships; one to “cooperator” and one to “cooperator/improver.” These two preservice teachers had cooperating teachers who were aware of NOS and implemented it in their own science instruction. The main factors that hindered or facilitated teaching NOS for these preservice teachers were the influence of the cooperating teacher and the use of the science curriculum. The preservice teacher with the cooperating teacher who understood and emphasized NOS herself and showed her how to modify the curriculum to include NOS, was able to explicitly teach NOS to her students. Those in classrooms whose cooperating teachers did not provide support for NOS instruction were unable to emphasize NOS. © 2009 Wiley Periodicals, Inc. J Res Sci Teach 47:213–233, 2010
Making formative assessment discernable to pre‐service teachers of science
Authors: Buck Gayle A. , Trauth‐Nare Amy , Kaftan Juliann 
Published: November 2009

AbstractThe purpose of this pragmatic action research study was to explore our re‐conceptualization efforts in preparing pre‐service teachers to guide the inquiry process with formative assessment and subsequently use the understandings to improve our teacher preparation program. The process was guided by two questions: to what extent did course re‐conceptualization efforts lead to a more informed understanding of formative assessment by pre‐service teachers and did strategies enacted in the re‐conceptualized methods course foster or hinder pre‐service teachers' understanding of formative assessment? Data from this study support the following findings: (1) a substantial pre‐ to post‐methods course difference was realized in the pre‐service teachers' understanding of formative assessment; (2) explicit and contextualized approaches to formative assessment in the methods course led to increased understandings by pre‐service teachers; (3) an implicit approach led to improvements in course structure but did not foster pre‐service teachers' understanding of the reflexive nature of formative assessment; and (4) a field‐based case study on elementary science teaching both hindered and fostered our efforts with formative assessment. This study yields implications for pre‐service teacher education on formative assessment. To foster pre‐service teachers' knowledge and skills, we suggest explicit instruction on formative assessment combined with case studies, field experiences, and ongoing reflection. © 2009 Wiley Periodicals, Inc. J Res Sci Teach 47: 402–421, 2010
PART II (Portable ART analyzer)—development of a XRF spectrometer adapted for the study of artworks in the Kunsthistorisches Museum, Vienna
Authors: Buzanich G. , Wobrauschek P. , Streli C. , Markowicz A. , Wegrzynek D. , Chinea‐Cano E. , Griesser M. , Uhlir K. 
Published: November 2009

AbstractA portable focused‐beam X‐ray fluorescence (XRF) spectrometer was designed and manufactured taking into account a huge variation in material, size and shape of museum objects. The spectrometer is equipped with a vacuum chamber enclosed with a Kapton‐window allowing the detection of chemical elements from Na upwards, which enables the characterization of glass and enamel objects. Two low‐power X‐ray tubes, one with a Mo‐anode the other with a Cr‐anode, operating from 4 to 50 kV and 0 to 2.5 mA with a maximum power of 50 W and a point focus of about 180 µm can be used as excitation source alternatively. A polycapillary lens with a spot size of 150 µm is used for focusing the primary beam to access small details of the different objects, e.g. fine brush strokes in paintings. The vacuum chamber can be evacuated to about 1 mbar.A miniature camera is installed inside the chamber for inspecting the analyzed area through the Kapton‐window. Two laser pointers mounted inside the chamber coincide with the focal point of the polycapillary at the investigated spot. The excitation and X‐ray fluorescence radiation paths in air are about 1 mm each, minimizing the absorption losses. The spectrometer was designed to maximize the accessibility to all parts of the investigated objects through the use of translation stages and an innovative design of the detection head, especially the vacuum chamber. This article shows the capability of the spectrometer to reach measuring positions in concave parts of objects and presents the determined detection limits of elements. Copyright © 2009 John Wiley & Sons, Ltd.
Structured derivations: a unified proof style for teaching mathematics
Authors: Back Ralph-Johan 
Published: November 2009

Abstract
Structured derivations were introduced by Back and von Wright as an extension of the calculational proof style originally proposed by E. W. Dijkstra and his colleagues. Structured derivations added nested subderivations and inherited assumptions to this style. This paper introduces further extensions of the structured derivation format, and gives a precise syntax and semantics for the extended proof style. The extensions provide a unification of the three main proof styles used in mathematics today: Hilbert-style forward chaining proofs, Gentzen-style backward chaining proofs and algebraic derivations and calculations (in particular, Dijkstra’s calculational proof style). Each of these proof styles can now be directly presented as a structured derivation. Even more importantly, the three proof styles can be freely intermixed in a single structured derivation, allowing different proof styles to be used in different parts of the derivation, each time choosing the proof style that is most suitable for the (sub)problem at hand. We describe here (extended) structured derivations, feature by feature, and illustrate each feature with examples. We show how to model the three main proof styles as structured derivations. We give an exact syntax for structured derivations and define their semantics by showing how a structured derivation can be automatically translated into an equivalent Gentzen-style sequent calculus derivation. Structured derivations have been primarily developed for teaching mathematics at the secondary and tertiary education level. The syntax of structured derivations determines the general structure of the proof, but does not impose any restrictions on how the basic notions of the underlying mathematical domain are treated. Hence, the style can be used for any kind of proofs, calculations, derivations, and general problem solving found in mathematics education at these levels. The precise syntax makes it easy to provide computer support for structured derivations.
The role of institutional pressures and organizational culture in the firm's intention to adopt internet‐enabled supply chain management systems
Authors: Liu Hefu , Ke Weiling , Wei Kwok Kee , Gu Jibao , Chen Huaping 
Published: November 2009

AbstractDrawing upon organizational culture and institutional theory, this study investigates how institutional pressures motivate the firm to adopt Internet‐enabled Supply Chain Management systems (eSCM) and how such effects are moderated by organizational culture. The results of a survey of 131 firms suggest that the dimensions of institutional pressures (i.e., normative, mimetic, and coercive pressures) have differential effects on eSCM adoption intention. While mimetic pressures are not related to eSCM adoption intention, normative and coercive pressures are positively associated with eSCM adoption intention. In addition, organizational culture (i.e., flexibility orientation and control orientation) plays different roles in the relationships between these three dimensions of institutional pressures and eSCM adoption intention. While flexibility orientation negatively moderates the effects of coercive pressures and positively moderates the effects of mimetic pressures, control orientation positively moderates the effects of coercive and normative pressures and negatively moderates the effects of mimetic pressures. Implications and suggestions for future research are provided.
SOBOLEV INEQUALITIES FOR ORLICZ SPACES OF TWO VARIABLE EXPONENTS
Authors: HÄSTÖ PETER , MIZUTA YOSHIHIRO , OHNO TAKAO , SHIMOMURA TETSU 
Published: November 2009

AbstractOur aim in this paper is to deal with Sobolev's embeddings for Sobolev–Orlicz functions with ∇u∈Lp(·)logLq(·)(Ω) for Ω ⊂n. Herepandqare variable exponents satisfying natural continuity conditions. Also the case whenpattains the value 1 in some parts of the domain is included in the results.
ON THE MULTIPLICITY OF SOLUTIONS FOR NON-LINEAR PERIODIC PROBLEMS WITH THE NON-LINEARITY CROSSING SEVERAL EIGENVALUES
Authors: KYRITSI SOPHIA TH. , PAPAGEORGIOU NIKOLAOS S. 
Published: November 2009

AbstractIn this paper we consider a non-linear periodic problem driven by the scalar p-Laplacian and with a non-smooth potential. We assume that the multi-valued right-hand-side non-linearity exhibits an asymmetric behaviour at ±∞ and crosses a finite number of eigenvalues as we move from −∞ to +∞. Using a variational approach based on the non-smooth critical-point theory, we show that the problem has at least two non-trivial solutions, one of which has constant sign. For the semi-linear (p = 2), smooth problem, using Morse theory, we show that the problem has at least three non-trivial solutions, again one with constant sign.
ZINBIEL ALGEBRAS AND COMMUTATIVE ALGEBRAS WITH DIVIDED POWERS
Authors: DOKAS IOANNIS 
Published: November 2009

AbstractIn this paper, we prove that any Zinbiel algebra can be endowed with the structure of commutative algebra with divided powers. We introduce the notion of universal enveloping Zinbiel algebra of a commutative algebra with divided powers algebras. We prove that the free divided powers algebra on a free moduleM, is the divided powers sub-algebra generated byM, of the divided powers algebra induced by the free Zinbiel algebra onM. Finally, we construct a basis for the enveloping Zinbiel algebra.
Cholesteatoma in three dimensions: a teaching tool and an aid to improved pre-operative consent
Authors: Morris D P , Van Wijhe R G 
Published: November 2009

AbstractBackground:Otological surgeons face two recurring challenges. Firstly, we must foster an appreciation of the complex, three-dimensional anatomy of the temporal bone in order to enable our trainees to operate safely and independently. Secondly, we must explain to our patients the necessity for surgery which carries the potential for serious complication.Methods:Amira® software was applied to pre-operative computed tomography images of temporal bones with cholesteatoma, to create three-dimensional computer images. Normal structures and cholesteatoma were displayed in a user-friendly, interactive format, allowing both trainee and patient to visualise disease and important structures within the temporal bone.Results:Three cases, and their three-dimensional computer models are presented. Zoom, rotation and transparency functions complemented the three-dimensional effect.Conclusion:These three-dimensional models provided a useful adjunct to cadaveric temporal bone dissection and surgical experience for our residents' teaching programme. Also, patients with cholesteatoma reported a better understanding of their pre-operative condition when the models were used during the consenting process.
Changes in facial nerve function, morphology and neurotrophic factor expression in response to three types of nerve injury
Authors: Zhang L , Fan Z , Han Y , Xu L , Luo J , Li J , Wang H 
Published: November 2009

AbstractObjective:To study the changes in facial nerve function, morphology and neurotrophic factor 3 expression in response to three types of nerve injury.Materials and methods:Changes in facial nerve function (in terms of blink reflex, vibrissae movement and position of nasal tip) were assessed in 45 rats in response to three types of nerve injury: partial section of the extratemporal segment (group one); partial section of the facial canal segment (group two); and complete transection of the facial canal segment (group three). All facial nerves were then dissected out from the sacrificed animals, on the first, seventh or 21st post-operative day, and the injured segment bisected for subsequent analysis. Morphological change and neurotrophic factor 3 expression in these facial nerve segments were evaluated by means of improved trichrome staining and immunohistochemical analysis, respectively.Results:Facial nerve function was more severely damaged and recovery was slower in group two compared with group one, although the facial nerve injury had been identical at the two sites involved. In group three (complete facial canal transection), scattered degenerative fibres were observed at the transection site on the seventh post-operative day. The number of degenerated fibres, assessed on the seventh post-operative day, was markedly increased in group two compared with group one. On the seventh post-operative day, axonal expression of neurotrophic factor 3 was strongly positive, whereas expression in Schwann cells was only weakly positive.Conclusions:The facial palsy of the group two rats was more severe than that of group one rats, although their facial nerve function had partly recovered on the 21st post-operative day. Fibre degeneration was not only dispersed throughout the injury site but also occurred throughout the length of the nerve. Neurotrophic factor 3 immunoreactivity increased in facial nerve fibres after partial transection.
Frequency and management of epistaxis in schools
Authors: Robertson A , King R , Tomkinson A 
Published: November 2009

AbstractStudy objectives:To investigate the frequency and management of epistaxis in schools.Study design:A postal survey of schools.Results:One hundred and fifty-seven questionnaires were posted out to 41 secondary schools (students aged 11–18 years) and to 116 primary schools (students aged four to 11 years). One hundred and twelve completed questionnaires were returned, 32 from secondary schools and 80 from primary schools. Most schools stated that they encountered a nose bleed once per month. The commonest method of treating a nose bleed was to pinch the top of the nose (an ineffective method), although pinching the bottom of the nose was almost as common. Only a minority of primary and secondary schools (37.5 and 25 per cent, respectively) had a policy for dealing with nose bleeds. Despite many respondents reportedly using an ineffective method, only two stated that they did not feel confident in dealing with nose bleeds.Conclusion:Nose bleeds in school students are common, and management frequently deviates from recommended guidelines.
Transnasal endoscopic repair of bilateral congenital choanal atresia: controversies
Authors: Eladl Hesham Mohammad 
Published: November 2009

AbstractObjective:To evaluate current concerns about transnasal endoscopic repair of bilateral congenital choanal atresia, regarding technical difficulties, prognostic factors and important controversies.Patients and methods:Ten infants with bilateral congenital choanal atresia, aged from 3 to 27 days (mean, 11.2 days) were included. All cases underwent transnasal endoscopic repair and were clinically and endoscopically monitored.Results:Of the seven patients treated with stenting, five remained patent and two required minor debridement (with complete patency thereafter). Of the three patients treated without stenting, one remained patent and two required minor debridement (with patency thereafter).Conclusions:Transnasal endoscopic repair of bilateral congenital choanal atresia is a safe and successful technique. The use of powered instrumentation in neonatal patients requires experience and a correctly sized drill. Stenting with an appropriate nasal tube for a suitable period is favoured, especially in hospitalised patients.
Is there a role for flexible oesophagogastroscopy in upper aerodigestive tract squamous cell carcinoma?
Authors: Beech T J , Trotter M I , McDermott A L , Mandal W , Batch A J 
Published: November 2009

AbstractIntroduction:There is growing evidence to suggest that reflux (both laryngopharyngeal and gastroesophageal) has a role in the development of upper aerodigestive tract squamous cell carcinoma. This study discusses the role of identifying reflux in this patient group, and its prevalence.Methods:Prospective review of patients with head and neck cancer undergoing flexible oesophagogastroscopy as part of their diagnostic investigation.Results:Forty-five consecutive patients were identified. All patients were found to have evidence of oesophagitis, with 28 having oesophageal erosions and two Barrett's oesophagitis.Conclusion:Flexible oesophagogastroscopy is a useful test in patients with upper aerodigestive tract squamous cell carcinoma.
Determinants of local people's attitude toward conservation and the consequential effects on illegal resource harvesting in the protected areas of Sulawesi (Indonesia)
Authors: LEE TIEN MING , SODHI NAVJOT S. , PRAWIRADILAGA DEWI M. 
Published: November 2009

SUMMARYThe exploitation of tropical forest resources is a key driver of the current biodiversity crisis, and it is pivotal to understand human attitudes toward conservation and resource harvesting. This paper investigates effects of interactions, perceptions of protected areas (PAs) and sociodemographic variables on conservation attitudes, and the correlates of illegal resource extraction among 660 households from 33 villages bordering eight PAs on Sulawesi (Indonesia). Mixed-effect multiple regression analyses showed that the most important predictors of the support for PAs included the degree of involvement in management, presence/absence of PA-human conflict, perceived sustainability of forest resources and length of residency in Sulawesi. Notably, active participation in community management by transmigrants and the reconciliation of land-rights conflicts for natives may promote favourable conservation attitudes. Ordination and correlation analyses also revealed that the extent of illegal resource harvesting activities, such as hunting and logging, were significantly influenced by a negative conservation attitude and past conflict with PA establishment. Garnering support for PAs through conservation education and resolving land-rights disputes could potentially alleviate illegal resource extraction. The disparity in resource extraction patterns among the villages across all PAs confirms the importance of adopting site-specific conservation strategies that may make PAs across the biologically unique yet critically threatened Indonesian Archipelago more effective.
Limited potential to recover from overfishing raises concerns for deep-sea sharks, rays and chimaeras
Authors: SIMPFENDORFER COLIN A. , KYNE PETER M. 
Published: November 2009

SUMMARYAs global fishing effort increasingly expands into deeper water, concerns exist over the ability of deep-sea fishes to sustain fisheries. There is however little quantitative evidence to support these concerns for the deep-sea cartilaginous fishes (Chondrichthyes: sharks, rays and chimaeras). This paper compiled available life history data for this group to analyse their ability to rebound from population declines relative to continental shelf and pelagic species. Deep-sea cartilaginous fishes have rates of population increase that are on average less than half those of shelf and pelagic species, and include the lowest levels observed to date. Population doubling times indicate that once a stock has been depleted, it will take decades, and potentially centuries, before it will recover. Furthermore, population recovery rates decrease with increasing depth, suggesting species that occur deepest are those most vulnerable to fishing. These results provide the first assessment of the productivity of deep-sea chondrichthyans, highlighting that precautionary management of developing deep-sea fisheries is essential if stocks and biodiversity are to be maintained.
Trophic ecology of blue whiting in the Barents Sea
Authors: Dolgov Andrey V. , Johannesen Edda , Heino Mikko , Olsen Erik 
Published: November 2009

AbstractDolgov, A. V., Johannesen, E., Heino, M., and Olsen, E. 2010. Trophic ecology of blue whiting in the Barents Sea. – ICES Journal of Marine Science, 67: 483–493. Blue whiting (Micromesistius poutassou) are distributed throughout the North Atlantic, including the Norwegian and Barents Seas. In recent years, both abundance and distribution of blue whiting in the Barents Sea have increased dramatically. Therefore, to evaluate the trophic impact of this increase, we analysed the diet of the species. In all, 54 prey species or taxa were identified, the main prey being krill. However, the diet varied geographically and ontogenetically: the proportion of fish in the diet was higher in large blue whiting and in the north of the range. Blue whiting overlap geographically with other pelagic species at the edge of their distribution in the Barents Sea, with juvenile herring in the south, with polar cod in the north, and with capelin in the northeast. The overlap in diet between blue whiting and these other pelagic species ranged from 6 to 86% and was greatest with capelin in areas where both species feed on hyperiids and krill. The importance of blue whiting as prey for predatory fish was highest in the areas of greatest abundance, but overall, blue whiting were seemingly unimportant as prey of piscivorous fish in the Barents Sea.
Detection of Three Whitefly-transmitted Viruses Infecting the Cucurbit Weed Cucumis melo var. dudaim in Florida
Authors: Adkins Scott , Webster Craig G. , Baker Carlye A. , Weaver Richard , Rosskopf Erin N. , Turechek William W. 
Published: November 2009

To the best of our knowledge this is the first report of Squash vein yellowing virus (SqVYV), Cucurbit leaf crumple virus (CuLCrV), and Cucurbit yellow stunting disorder virus (CYSDV) infecting C. melo var. dudaim. Coupled with previous observations of SqVYV and CuLCrV infection of M. charantia, our current results are further evidence of the importance of cucurbit weeds as reservoirs for all three recently detected whitefly-transmitted viruses plaguing Florida cucurbit crops. Accepted for publication 11 September 2009. Published 18 November 2009.