Fen Öğretmen Adaylarının Modeller ve Modelleme Hakkındaki Görüşleri ve İçerik Bilgileri

The aim of this study was to investigate pre-service science teachers’ views and knowledge of models and modeling. The data were collected from seven participants through semistructured interviews and an open-ended questionnaire. The results indicated that variations and deficiencies existed among the participants’ views and knowledge of models. The participants were unable to distinguish exclusive characteristics of scientific models. It was also found that the pre-service science teachers favored a teaching model according to model’s aesthetic appeal, scientific context, and practicality. It is recommended that pre-service science teachers should engage in more modeling activities and gain more modeling experiences throughout their training programs to improve their content knowledge of models and modelingBu çalışmanın amacı, fen öğretmen adaylarının modeller ve modelleme hakkındaki görüş ve bilgilerinin incelenmesidir. Çalışmanın verileri yarı-yapılandırılmış görüşmeler ve açık-uçlu anket kullanarak yedi katılımcıdan elde edilmiştir. Sonuçlar, katılımcıların modeller hakkındaki görüşlerinde farklılıklar ve yetersizlikler olduğunu ortaya koymuş ve katılımcıların bilimsel modellerin özgün karakterlerini belirleyemediklerini göstermiştir. Yine sonuçlar, öğretmen adaylarının bir öğretim modelini tercih ederken modelin estetik çekiciliğine, bilimsel içeriğine ve kullanılabilirliğine dikkat ettiklerini göstermektedir. Bulgular, fen öğretmen adaylarının eğitim programları sürecinde daha fazla modelleme aktivitelerine katılmasını ve daha fazla modelleme deneyimi kazanmasını ve böylece modeller ve modelleme hakkında sahip oldukları içerik bilgilerinin geliştirilmesini öngörmektedir

An Alternative Carry-save Arithmetic for New Generation Field Programmable Gate Arrays

In this work, a double carry-save addition operation is proposed, which is efficiently synthesized for 6-input LUT-based eld programmable gate arrays (FPGAs). The proposed arithmetic operation is based on redundant number representation and provides carry propagation-free addition. Using the proposed arithmetic operation, a compact and fast multiply and accumulate unit is designed. To our knowledge, the proposed design provides the fastest multiply-add operation for 6-input LUT-based FPGA systems. A nite impulse response lter implementation is given to show the performance of the proposed structure. The proposed implementation provides a dramatic performance increase, which is at least 2 times faster than conventional binary multiply-add implementations

Increased fat graft survival with mesenchymal stem cell recruiting effect of PRP: in vitro and in vivo study of application techniques

Aim: Adding platelet-rich plasm (PRP) or mesenchymal stem cells are the most accepted methods to increase fat graft’s permanence. However, there is no consensus on timing and whether the effect of stem cells or PRP is observed more in the recipient area or in the donor area. It is aimed to present the application method and localization of PRP to be combined with fat graft to increase the survival. Material and Methods: in vitro part: Fat grafts were kept in a medium containing PRP. Cell output from the fat graft to the Petri dishes was examined every day. The time to recruit the maximum number of stem cells to the medium was determined (day 10). in vivo part: Eight group of rats were received PRP in different concentrations either to recipient or donor areas of fat grafts. After ten days, fat grafts were transferred to the recipient area. Ninety days after the transfer, histopathological examination and immunohistochemical staining were performed. Results: The group which had received the full-dose PRP to the recipient area showed the highest cellular integrity and vascularity (p< 0.05). Vascularity was superior in the half-dose PRP group compared to the control group (p< 0.05); cellular integrity did not increase. Donor site groups did not show increase in cellular integrity. Conclusion: Although PRP starts to increase fat graft permanence by increasing vascularity, it acts by preserving the cellular integrity of the fat cells as the concentrations increase. The PRP injection to the recipient area 10 days before fat grafting may provide higher survival rates

A MSFD complementary approach for the assessment of pressures, knowledge and data gaps in Southern European Seas : the PERSEUS experience

PERSEUS project aims to identify the most relevant pressures exerted on the ecosystems of the Southern European Seas (SES), highlighting knowledge and data gaps that endanger the achievement of SES Good Environmental Status (GES) as mandated by the Marine Strategy Framework Directive (MSFD). A complementary approach has been adopted, by a meta-analysis of existing literature on pressure/impact/knowledge gaps summarized in tables related to the MSFD descriptors, discriminating open waters from coastal areas. A comparative assessment of the Initial Assessments (IAs) for five SES countries has been also independently performed. The comparison between meta-analysis results and IAs shows similarities for coastal areas only. Major knowledge gaps have been detected for the biodiversity, marine food web, marine litter and underwater noise descriptors. The meta-analysis also allowed the identification of additional research themes targeting research topics that are requested to the achievement of GES. 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.peer-reviewe

Investigation of prospective teachers\u27 knowledge and understanding of *models and modeling and their attitudes towards the use of models in science education

The purpose of this study was to investigate prospective science teachers\u27 knowledge and understanding of models and modeling, and their attitudes towards the use of models in science teaching through the following research questions: What knowledge do prospective science teachers have about models and modeling in science? What understandings about the nature of models do these teachers hold as a result of their educational training? What perceptions and attitudes do these teachers hold about the use of models in their teaching? Two main instruments, semi-structured in-depth interviewing and an open-item questionnaire, were used to obtain data from the participants. The data were analyzed from an interpretative phenomenological perspective and grounded theory methods. Earlier studies on in-service science teachers\u27 understanding about the nature of models and modeling revealed that variations exist among teachers\u27 limited yet diverse understanding of scientific models. The results of this study indicated that variations also existed among prospective science teachers\u27 understanding of the concept of model and the nature of models. Apparently the participants\u27 knowledge of models and modeling was limited and they viewed models as materialistic examples and representations. I found that the teachers believed the purpose of a model is to make phenomena more accessible and more understandable. They defined models by referring to an example, a representation, or a simplified version of the real thing. I found no evidence of negative attitudes towards use of models among the participants. Although the teachers valued the idea that scientific models are important aspects of science teaching and learning, and showed positive attitudes towards the use of models in their teaching, certain factors like level of learner, time, lack of modeling experience, and limited knowledge of models appeared to be affecting their perceptions negatively. Implications for the development of science teaching and teacher education programs are discussed. Directions for future research are suggested. Overall, based on the results, I suggest that prospective science teachers should engage in more modeling activities through their preparation programs, gain more modeling experience, and collaborate with their colleagues to better understand and implement scientific models in science teaching

Some Curvature Properties of Globally Framed Almost f-Cosymplectic Manifolds

International Conference on Advances in Natural and Applied Sciences (ICANAS) -- APR 18-21, 2017 -- Antalya, TURKEYWOS: 000405093100010The purpose of this paper is to study fundamental curvature properties for globally framed almost f-cosymplectic manifolds.Agri Ibrahim Cecen Univ, IC Fd

Holomorphically Planar Conformal Vector Field On Almost alpha-Cosymplectic (kappa,mu)− Spaces

The aim of the present paper is to study holomorphically planar conformal vector (HPCV) fields on almost α−α−cosymplectic (κ,μ)−(κ,μ)−spaces. This is done assuming various conditions such as i) UU is pointwise collinear with ξξ ( in this case, the integral manifold of the distribution DD is totally geodesic, or totally umbilical), ii) MM has a constant ξ−ξ−sectional curvature (under this condition the integral manifold of the distribution DD is totally geodesic (or totally umbilical) or the manifold is isometric to sphere S2n+1(√c)S2n+1(c) of radius 1√c1c), iii) MM an almost α−α−cosymplectic (κ,μ)−(κ,μ)−spaces ( in this case the manifold has constant curvature, or the integral manifold of the distribution DD is totally geodesic(or totally umbilical) or UU is an eigenvector of h).h)

An Introduction to Globally Framed Almost f-Cosymplectic Manifolds

International Conference on Advances in Natural and Applied Sciences (ICANAS) -- APR 18-21, 2017 -- Antalya, TURKEYWOS: 000405093100049The purpose of this paper is to define a new class of framed manifolds. We give an explicit example of globally framed almost f-cosymplectic manifolds.Agri Ibrahim Cecen Univ, IC Fd

Almost f-cosymplectic manifolds

The purpose of this paper is to study a new class of contact manifolds. Such manifolds are called almost f-cosymplectic manifolds. Several tensor conditions are studied for such type of manifolds. We conclude our results with two examples of almost f-cosymplectic manifolds