Detaylı Arama

İptal
Bulunan: 48 Adet 0.002 sn
- Eklemek veya çıkarmak istediğiniz kriterleriniz için 'Dahil' / 'Hariç' seçeneğini kullanabilirsiniz. Sorgu satırları birbirine 'VE' bağlacı ile bağlıdır.
- İptal tuşuna basarak normal aramaya dönebilirsiniz.
Filtreler
Filtreler
Bulunan: 48 Adet 0.002 sn
Koleksiyon [18]
Tam Metin [2]
Yayın Türü [3]
Yazar [20]
Yayın Yılı [10]
Konu Başlıkları [20]
Yayıncı [1]
Yayın Dili [1]
Dergi Adı [20]
Difficulties in learning and teaching statistics: teacher views

Koparan T.

Article | 2015 | International Journal of Mathematical Education in Science and Technology46 ( 1 ) , pp.94 - 104

The purpose of this study is to define teacher views about the difficulties in learning and teaching middle school statistics subjects. To serve this aim, a number of interviews were conducted with 10 middle school maths teachers in 2011–2012 school year in the province of Trabzon. Of the qualitative descriptive research methods, the semi-structured interview technique was applied in the research. In accordance with the aim, teacher opinions about the statistics subjects were examined and analysed. Similar responses from the teachers were grouped and evaluated. The teachers stated that it was positive that middle school statistics s . . .ubjects were taught gradually in every grade but some difficulties were experienced in the teaching of this subject. The findings are presented in eight themes which are context, sample, data representation, central tendency and dispersion measure, probability, variance, and other difficulties. © 2014, Taylor & Francis Daha fazlası Daha az

Non-linear response of the rockfill in a concrete-faced rockfill dam under seismic excitation

Kartal M.E. | Bayraktar A.

Article | 2015 | Mathematical and Computer Modelling of Dynamical Systems21 ( 1 ) , pp.77 - 101

This study investigates the non-linear response of the rockfill in a concrete-faced rockfill dam under seismic excitation for various concrete slab thicknesses from 30 to 100 cm thick. The effect of the friction in the concrete slab rockfill interface on the non-linear response of the rockfill is also considered in the numerical solutions. The friction contact in the concrete slab joints is provided with contact elements based on the Coulomb’s friction law. The hydrodynamic pressure of the reservoir water is considered by the fluid finite elements based on the Lagrangian approach. Geometrical and material non-linear behaviours of th . . .e dam-foundation-reservoir interaction system are considered together in the finite element analyses. The Drucker–Prager model is used to obtain materially non-linear behaviour of the concrete slab. The multi linear kinematic hardening model is used for rockfill and foundation rock in the material non-linear analyses. Therefore, the uniaxial stress–strain relations of the rockfill and foundation rock are determined from the shear stress–shear strain relations of the gravel and rock, respectively. The principle compressive and tensile stresses of the rockfill are investigated along the horizontal section of the rockfill. According to numerical analyses, the most critical stresses occur in the upstream and downstream faces of the dam for the concrete slab thickness of 30 cm, while the optimum thickness for seismic performance is 58 cm. © 2014, © 2014 Taylor & Francis Daha fazlası Daha az

Information content of optical satellite images for topographic mapping

Topan H. | Maktav D. | Jacobsen K. | Buyuksalih G.

Conference Object | 2009 | International Journal of Remote Sensing30 ( 7 ) , pp.1819 - 1827

Geometric high-resolution satellite imagery (HRSI) is being used increasingly for generating large-scale topographic maps. The detection of object shapes has become easier and more accurate with improved geometric resolution. The grey value range and spectral resolution are also important for the identification and classification of objects. The nominal ground sampling distance (GSD) must not be the same as the effective GSD corresponding to the information content. In addition, the topographic conditions, object contrast, sun elevation and azimuth and atmospheric conditions influence the object identification. The information conte . . .nt of panchromatic and multispectral satellite images (Landsat 7 ETM+, ASTER, TK-350, KVR-1000, SPOT-5, IRS-1C, IKONOS, QuickBird and OrbView-3) available for the Zonguldak test field were investigated with respect to the generation of large-scale topographic maps. The rule of thumb for topographic mapping of at least 0.1 mm GSD in the map scale with the limit of a maximum of 5 m GSD also for smaller map scales has been confirmed Daha fazlası Daha az

Antibacterial chitosan/silk sericin 3D porous scaffolds as a wound dressing material

Karahaliloglu Z. | Kilicay E. | Denkbas E.B.

Article | 2017 | Artificial Cells, Nanomedicine and Biotechnology45 ( 6 ) , pp.1172 - 1185

Antimicrobial mixed dressings have traditionally been used to minimize bacterial infection of burns and other wounds. This study presents the advancement of biocompatible chitosan/silk sericin (CHT/SS) scaffolds combined with lauric acid (LA) and zinc oxide nanoparticles (nZnO) for the successful wound dressing applications. Antibacterial assay results showed that the diameters of the inhibition zone increased from 2 ± 0.4 to 7 ± 0.1 mm for Escherichia coli, as well as from 2.5 ± 0.2 to 6 ± 0.4 mm for Staphylococcus aureus while CHTS/SS/100nZnO compared to CHT/SS/0.01LA. The results not only showed excellent inhibition against Gram- . . .positive and Gram-negative bacterial growth but also revealed improved proliferation and extended viability for HaCaT cells. © 2016 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

The composition effect for the thermal properties of PdnAg(42-n)Pt13 ternary nanoalloys: a molecular dynamics study

Garip A.K.

Article | 2019 | Molecular Simulation45 ( 13 ) , pp.1004 - 1013

In this study, the classical molecular dynamics simulations in canonical ensemble conditions (NVT) were used to investigate the dynamical properties of trimetallic Pd–Pt–Ag nanoalloy clusters with the interatomic interactions modelled by the Gupta many-body potential. The optimisations for best homotops were performed using the basin-hopping algorithm for 55 atom icosahedral PdnAg(42-n)Pt13 trimetallic clusters. We performed optimisations to search the best chemical ordering of icosahedron structure not allowing any geometric changes. The icosahedron structures which are the best homotops have a core-shell segregation. The obtained . . .icosahedral structures with best homotops were taken as the initial configurations for MD simulations. The temperature ranges were explored which the surface sites of the clusters stay thermally stable. We estimated the melting temperatures of PdnAg(42-n)Pt13 trimetallic clusters using caloric curves and Lindemann parameters. No simple correlation between alloy composition and melting temperatures was determined. The Pd35Ag7Pt13 composition has the highest melting temperature, however, the Pd21Ag21Pt13 is the most stable composition according to the relative stability investigation. The simulation results showed that the melting of all PdnAg(42-n)Pt13 clusters takes place as a whole without any surface premelting. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Techniques and modifications for TMJ arthrocentesis: A literature review

Şentürk M.F. | Yazıcı T. | Gülşen U.

Article | 2018 | Cranio - Journal of Craniomandibular Practice36 ( 5 ) , pp.332 - 340

Objectives: To discuss advantages and disadvantages of TMJ arthrocentesis techniques, identifying modifications as reported in the literature. Methods: A PubMed web-based search was carried out, using the terms TMJ and arthrocentesis, to determine the scope of coverage in well-documented articles in English. Results: Among 237 articles, 12 distinct techniques were described for TMJ arthrocentesis in 12 articles. Among 12 techniques, 5 were classified as double puncture arthrocentesis (DPA) and 7 as single puncture arthrocentesis (SPA). In total, 17 well documented articles about SPA were found in literature. Discussion: Arthrocentes . . .is of the temporomandibular joint (TMJ) was first described in 1991. To make the traditional procedure even less invasive, many arthrocentesis methods have been described. However, in 2015, TMJ arthrocentesis techniques were divided into two groups to limit the complexities surrounding the concepts related to TMJ arthrocentesis techniques. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Exploring image fusion of ALOS/PALSAR data and LANDSAT data to differentiate forest area

Abdikan S.

Article | 2018 | Geocarto International33 ( 1 ) , pp.21 - 37

Remote sensing data utilize valuable information via various satellite sensors that have different specifications. Image fusion allows the user to combine different spatial and spectral resolutions to improve the information for purposes such as forest monitoring and land cover mapping. In this study, I assessed the contribution of dual-polarized Advanced Land Observing Satellite/Phased Array type L-band Synthetic Aperture Radar data to multispectral Landsat imagery. The research investigated the separability of forested areas using different image fusion techniques. Quality analysis of the fused images was conducted using qualitati . . .ve and quantitative analyses. I applied the support vector machine image classification method for land cover mapping. Among all methods examined, the à trous wavelet transform method best differentiated the forested area with an overall accuracy (OA) of 94.316%, while Landsat had an OA of 92.626%. The findings of this study indicated that optical-SAR-fused images improve land cover classification, which results in higher quality forest inventory data and mapping. © 2016 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Area-based quality control of airborne laser scanning 3D models for different land classes using terrestrial laser scanning: sample survey in Houston, USA

Sefercik U.G. | Glennie C. | Singhania A. | Hauser D.

Article | 2015 | International Journal of Remote Sensing36 ( 23 ) , pp.5916 - 5934

Airborne laser scanning (ALS) is a remote-sensing technique that provides scale-accurate 3D models consisting of dense point clouds with x, y planimetric coordinates and altitude z. Using ALS, very high-resolution (VHR) digital surface models (DSMs) have been widely used for commercial and scientific applications since the early 1990s. Although there is widespread usage, there has been little comprehensive investigation of quality control for ALS DSMs in the literature, as most studies have been limited to assessing point-based vertical accuracy. This article is dedicated to investigating the quality of ALS DSMs for different land c . . .lasses using statistical and visual approaches based on absolute and relative vertical accuracy metrics. Rather than a limited number of ground control points (GCP), the model-to-model-based approach is applied and DSMs derived from terrestrial laser scanning (TLS) point clouds that have around 5 mm absolute and 3 mm relative geolocation accuracy were used as the reference data for comparison. The results demonstrate that in open, grass, and building land classes, the ALS DSMs reached both standard deviation (?) and normalized median absolute deviation (NMAD) of 3–5 cm after the elimination of any systematic biases. This result sufficiently satisfies the vertical accuracy requirements for 1/1000-scale topographic maps determined by National Digital Elevation Program (NDEP) specifications. In tall vegetation, a higher number of discrepancies larger than 0.5 m exist, reversing the relation between ? and NMAD. These vegetation errors also do not appear to be normally distributed. As an additional investigation, the performance of ALS DEMs under dense high-vegetation areas was assessed. These under-canopy ALS DEMs, created using only classified ground returns, offer both ? and NMAD of 12–14 cm, a performance level that is difficult to achieve under-canopy using photogrammetric techniques. © 2015 Taylor & Francis Daha fazlası Daha az

Uniqueness in an integral geometry problem and an inverse problem for the kinetic equation

Amirov A. | Gölgeleyen F. | Yamamoto M.

Article | 2017 | Applicable Analysis96 ( 13 ) , pp.2236 - 2249

In this paper, we discuss the uniqueness in an integral geometry problem along the straight lines in a strongly convex domain. Our problem is related with the problem of finding a Riemannian metric by the distances between all pairs of the boundary points. For the proof, the problem is reduced to an inverse source problem for a kinetic equation and then the uniqueness theorem is proved using the tools of Fourier analysis. © 2016 Informa UK Limited, trading as Taylor & Francis Group.

An interval type-2 fuzzy QUALIFLEX approach to measure performance effectiveness of ballast water treatment (BWT) system on-board ship

Demirel H. | Akyuz E. | Celik E. | Alarcin F.

Article | 2019 | Ships and Offshore Structures14 ( 7 ) , pp.675 - 683

Ballast water is of paramount importance for safe and efficient shipping operation since it provides ship’s strength and stability. The ballast water, on the other hand, poses serious marine ecological problems due to the non-indigenous species (NIS) carried in sea water. The International Maritime Organisation introduced International Convention for the Control and Management of Ships’ Ballast Water and Sediments (BWM Convention) to prevent the spread of harmful species from one region to another via ballast water. According to the convention, each ship must be equipped with a proper ballast water treatment system (BWTS). In this c . . .ontext, this paper is aimed at measuring the performance effectiveness of current BWTS used in ships. To achieve this purpose, a Qualitative Flexible (QUALIFLEX) method is used under interval type-2 fuzzy sets (IT2FSs) environment. While the QUALIFLEX handles all possible permutations of the alternatives for outranking, the IT2FSs deal with uncertainty this paper provides practical benefits to ship owners, ship’s safety inspectors, managers and marine environmentalists during decision-making progress of the BWTS settlement on-board ship. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group Daha fazlası Daha az

Impact of content knowledge on pedagogical content knowledge in the context of cell division

Şen M. | Öztekin C. | Demirdöğen B.

Article | 2018 | Journal of Science Teacher Education29 ( 2 ) , pp.102 - 127

This study focused on how science teachers’ content knowledge influences their pedagogical content knowledge (PCK) with respect to the topic of cell division. The data were collected from 3 in-service teachers using interviews; observations; and teacher-provided documents, including written-answer exams. The participants’ content knowledge was analyzed by inductive coding with respect to conceptual understanding, whereas their PCK was analyzed by withincase analysis followed by cross-case analysis to show how content knowledge affects PCK. The findings showed that content knowledge may support knowledge of what students understand i . . .n science as well as knowledge of instructional strategies, whereas the impact of content knowledge on teachers’ knowledge of the science curriculum and their knowledge of assessment in science is complicated. Moreover, content knowledge may not have any effect on teachers’ orientations toward teaching science. Implications for science teacher education and research are discussed. © 2018 Association for Science Teacher Education Daha fazlası Daha az

Comparative evaluation of push-out bond strength of Neo MTA Plus with Biodentine and white ProRoot MTA

Aktemur Türker S. | Uzunoğlu E. | Bilgin B.

Article | 2017 | Journal of Adhesion Science and Technology31 ( 5 ) , pp.502 - 508

Objective: The aim of this in vitro study was to evaluate the bond strength of a new calcium silicate cement, Neo MTA Plus (Avalon Biomed Inc. Bradenton, FL, U.S.A) by comparing ProRoot MTA and Biodentine. Material and Methods: Sixty dentin slices were instrumented to achieve a diameter of 1.3 mm. Group 1: white ProRoot MTA, group 2: Biodentine, group 3: Neo MTA Plus–G (powder mixed with gel), group 4: Neo MTA Plus–W (powder mixed with distilled water) were loaded into cavities. The push-out bond strength values were measured. Data were analyzed using Welch ANOVA with Bonferroni correction p = 0.05. Failure modes (adhesive, cohesive . . ., and mixture) were analyzed. Results: The highest bond strength value was recorded in Neo MTA Plus mixed with gel (5.23 ± 1.78 MPa), whereas white ProRoot MTA (2.57 ± 0.66 MPa) had the lowest. Bond strength values of Neo MTA Plus mixed either with gel or with distilled water were statistically different from both white ProRoot MTA and Biodentine (2.61 ± 0.70 MPa) (p Daha fazlası Daha az

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