Bulunan: 5.018 Adet 0.005 sn
Koleksiyon [20]
Tam Metin [2]
Yayın Türü [10]
Yazar [20]
Yayın Yılı [20]
Konu Başlıkları [20]
Yayıncı [20]
Yayın Dili [6]
Dergi Adı [20]
Editör/Editörler [20]
The effect of elementary students' attitude towards science on their levels of test anxiety

Akman, Berrin | Izgi, Uemit | Bagce, Habibe | Akilli, Halil Ibrahim

Article | 2007 | EGITIM VE BILIM-EDUCATION AND SCIENCE32 ( 146 ) , pp.3 - 11

The objective of this study is to find out the effect of second-grade elementary students' (6(th)-, 7(th)- and 8(th)-year students) attitude towards science course on their levels of test anxiety. This study will be carried out by using the descriptive method. The subjects of this study will be 145 second-grade students in Ergin Elementary School in Bala, Ankara, Koseli Elementary School in Bala, Ankara and Sehit Orhan Yalcin Elementary School in Dortdivan, Bolu. he Test Anxiety Inventory and the Scale of Attitude Towards Science will be administered to students. The correlation between test anxiety scores and attitude scores as wel . . .l as the correlation between anxiety-gender and attitude-gender will be sought for in this study. It has been found out that there is a significant correlation between test anxiety scores and attitude scores. However, no significant difference is known about anxiety-gender and attitude-gender relations Daha fazlası Daha az



Conference Object | 1994 | MINE PLANNING AND EQUIPMENT SELECTION 1994 , pp.757 - 764

3rd International Symposium on Mine Planning and Equipment Selection -- OCT 18-20, 1994 -- ISTANBUL, TURKEY WOS: A1994BB59Q00124

Optimization of design and operating parameters in a pilot scale Jameson cell for slime coal cleaning

Hacifazlioglu H. | Toroglu I.

Article | 2007 | Fuel Processing Technology88 ( 7 ) , pp.731 - 736

The Jameson flotation cell has been commonly used to treat a variety of ores (lead, zinc, copper etc.), coal and industrial minerals at commercial scale since 1989. It is especially known to be highly efficient at fine and ultrafine coal recovery. However, although the Jameson cell has quite a simple structure, it may be largely inefficient if the design and operating parameters chosen are not appropriate. In this study, the design and operating parameters of a pilot scale Jameson cell were optimized to obtain a desired metallurgical performance in the slime coal flotation. The optimized design parameters are the nozzle type, the he . . .ight of the nozzle above the pulp level, the downcomer diameter and the immersion depth of the downcomer. Among the operating parameters optimized are the collector dosage, the frother dosage, the percentage of solids and the froth height. In the optimum conditions, a clean coal with an ash content of 14.90% was obtained from the sample slime having 45.30% ash with a combustible recovery of 74.20%. In addition, a new type nozzle was developed for the Jameson cell, which led to an increase of about 9% in the combustible recovery value. Crown Copyright © 2007 Daha fazlası Daha az

Resilience and Redundance: Resource Networks and the Neolithic Chert Economy at Catalhoyuk, Turkey

Nazaroff, Adam Joseph | Baysal, Adnan | Ciftci, Yahya | Prufer, Keith

Article | 2015 | EUROPEAN JOURNAL OF ARCHAEOLOGY18 ( 3 ) , pp.402 - 428

The polycentric nature of Neolithic developments in the Middle East has prompted several discussions related to the processes driving regional diversification in the emergence of agglomerate societies. Archaeologists have recognized how diverse social, environmental, and material landscapes shaped various communities, resulting in a heterogenous Neolithic world. In this paper, we use portable x-ray fluorescence analysis to determine the use of different chert resources at the site of Catalhoyuk, Turkey, and question how their consumption affected, and was affected by, different social and material practices enacted within the commun . . .ity. We adopt a network perspective to examine the range of behaviours that consumed particular resources, and trace how alterations in these networks impacted the social fabric of Catalhoyuk. Ultimately, we conclude that different investments involved in the consumption of each resource either promoted or restricted their use through time. A more complete picture of Neolithic life, we suggest, takes note of the varied relationships that communities developed with nearby social and environmental landscapes, including nuances in the ways in which resources were incorporated into different facets of each community Daha fazlası Daha az


Gumus, Mehmet | Soykan, Yuksel

Article | 2017 | JOURNAL OF APPLIED MATHEMATICS & INFORMATICS35 ( 03.Apr ) , pp.267 - 276

The purpose of this paper is to investigate the local asymptotic stability of equilibria, the periodic nature of solutions, the existence of unbounded solutions and the global behavior of solutions of the fractional difference equation x(n+1) = alpha xn-(k+1)/beta+gamma x(n)(p) (k)x(n)(g)-(k+2), n =0,1... where the parameters alpha, beta, gamma; p, q are non-negative numbers and the initial values x - (k + 2), x -(k + 1),..., x-1; x(0) is an element of R+.

Our open heart surgery experience in factor XII deficiency: a case report

Coskun, Elif | Buyukates, Mustafa


Factor XII deficiency is an important hematological problem which is characterized by isolated prolongation of the activated partial thromboplastin time and presents with thrombosis and thromboembolism tendency rather than expected bleeding diathesis in clinical practice. A 55-year-old male patient who was scheduled for aortic coronary bypass graft surgery had elevated activated partial thromboplastin time (109.4 sec) as a laboratory finding. The patient was diagnosed with factor XII deficiency and operated in our clinic. No thromboembolic event was seen during follow-up. The patient was discharged in the seventh postoperative day u . . .neventfully. Herein, we highlight the importance of this disease due to its rare occurrence and present our treatment strategy applied Daha fazlası Daha az

Clodronic acid in the treatment of postmenopausal osteoporosis

Tanakol R. | Yarman S. | Bayraktaroglu T. | Boztepe H. | Alagöl F.

Article | 2007 | Clinical Drug Investigation27 ( 6 ) , pp.419 - 433

Background: Clodronic acid, a first-generation bisphosphonate, has been successfully used in the treatment of high bone turnover states, Paget's disease and osteolytic bone metastases. However, controversies remain over its optimal dosage and method of administration in the treatment of postmenopausal osteoporosis. In this study we aimed to evaluate the effect of clodronic acid treatment for 3 years on bone mineral density (BMD) in women with postmenopausal osteoporosis. Methods: This was a prospective, open-label, randomised, controlled study that was conducted in an outpatient clinic at the Bone Metabolism Unit of a tertiary refer . . .ral centre university hospital. Thirty postmenopausal women (age range 48-73 years) with osteoporosis and a control group of 49 osteoporotic women (age range 47-74 years) received randomised therapy. The clodronic acid group of participants received oral doses of clodronic acid 800mg plus elemental calcium 500mg and 400IU of vitamin D daily, while the control group was treated with calcium and vitamin D only. BMD was measured by dual energy x-ray absorptiometry at yearly intervals. Biochemical markers of bone turnover were also measured. Results: In this clinical study of postmenopausal women with osteoporosis, 36 months of clodronic acid treatment significantly increased average femoral neck BMD by 3.2 ± 2.9%, trochanter BMD by 2.2 ± 2.9% and lumbar spine BMD by 3.1 ± 3%. In the control group, femoral neck, trochanter and lumbar spine BMD decreased by -6 ± 2.7%, -7.3 ± 2.5% and -5.4 ± 2%, respectively (p < 0.01, p < 0.05 and p < 0.05 for clodronic acid vs control, respectively). There was a significant decrease in urinary hydroxyproline (-38.3%) over 3 years in the clodronic acid group compared with baseline (p < 0.05), while no significant change occurred in the control group. Clodronic acid was well tolerated and compliance was good. There were no clinically meaningful differences in the incidence of individual adverse events between the groups. Conclusion: These results indicate that daily oral administration of clodronic acid 800mg provides benefits to skeletal bone density in osteoporotic postmenopausal women. Calcium and vitamin D supplementation alone did not prevent further bone loss. © 2007 Adis Data Information BV. All rights reserved Daha fazlası Daha az

Ultrastructural observations in somatic embryogenesis of natural tetraploid Trifolium pratense L.

Colgecen, Hatice | Buyukkartal, Hatice Nurhan | Koca-Caliskan, Ufuk

Article | 2016 | TURKISH JOURNAL OF BOTANY40 ( 5 ) , pp.496 - 505

Previous reports of plant regeneration of natural tetraploid T. pratense L. 'Elci' could be realized only through the apical meristem calli. In order to proceed to the production stage, other regeneration methods need to be tried. Aseptic seedlings were used for the production of somatic embryos through various 2,4-D and kinetin trials. Nonuniform external callus cells with translucent cytoplasm were observed in various developmental stages of somatic embryos. Beneath these cells, there were uniformly aligned, dark-stained embryo cells with dense cytoplasm. Despite the similar developmental stages and cell characteristics of zygotic . . . and somatic embryos, the walls of somatic embryo cells revealed a highly wavy pattern. The nucleus generally contained only one nucleolus, which was spherical, dark stained, and electron-dense. Electron-dense droplets were seen in vacuoles. The cytoplasm consisted of starch-containing amyloplasts, mitochondria, plastids, ribosomes, endoplasmic reticulum, dictyosomes, lipid, and protein bodies. In some of the somatic embryos at the globular and heart stages, vacuole or electron-translucent zones were observed in the nucleolus. Additionally, a few embryo degenerations were recorded during developmental stages of the zygotic embryo. For the first time, the somatic embryos of natural tetraploid T. pratense were produced from hypocotyl (85%), cotyledon (75%), and apical meristem (60%) explants in 0.3 mg/L 2,4-D and 2 mg/L kinetin-containing MS medium. Our study developed an effective and efficient in vitro production method for using natural tetraploid T. pratense in biotechnological studies Daha fazlası Daha az

Characteristics of external genitalia in pre- and postmenopausal women

Basaran M. | Kosif R. | Bayar U. | Civelek B.

Article | 2008 | Climacteric11 ( 5 ) , pp.416 - 421

Objective: To determine those objective measurements that characterize the differences between the external genital organs of pre- and postmenopausal women. Methods: During the study period, 50 premenopausal and 50 postmenopausal patients were recruited. Only women who were admitted for routine control examinations were consecutively included in the study. Exclusion criteria were previous history of pelvic surgery including external and internal genital organs, presence of diseases that may change the anatomy of external genital organs, Mullerian anomalies, previous vaginal birth with mediolateral episiotomy, and use of hormone repl . . .acement therapy. The following measurements were performed: length and width of clitoris, labium majus, and labium minus, the distance between the clitoris and urethra, perineal length, and length of vagina. Results: The length of the vagina and the width of the labium minus were significantly different between the two groups. Mean vaginal length was significantly longer in premenopausal women compared to postmenopausal women (90.3 ± 14.8 mm vs. 82.3 ± 11.2 mm, respectively). The labia minora were wider in premenopausal women than in postmenopausal women (17.9 ± 4.1 mm vs. 15.4 ± 4.7 mm). Conclusions: Characterization of the anatomical changes and relationships of external genitalia in postmenopausal women is important for functional and perioperative evaluation. In addition to reconstructive surgical procedures, determination of the objective measurements of anatomical landmarks in postmenopausal external genitalia might also be useful for assessing the results of treatment of 'atrophic' changes in women. © 2008 International Menopause Society Daha fazlası Daha az

A molecular dynamics study: Structures and thermal stability of PdmPt(13-m)Ag42 ternary nanoalloys

Garip, Ali Kemal

Article | 2018 | INTERNATIONAL JOURNAL OF MODERN PHYSICS C29 ( 9 ) , pp.416 - 421

Structural optimization of ternary PdmPt(13-m)Ag42 nanoalloys was performed using the basin-hopping algorithm, and the Gupta many-body potential was adopted to model interatomic interaction. The optimization results show that all compositions have a structure based on icosahedron with a coreshell segregation. While the Ag atoms prefer to segregate to the surface, Pd and Pt atoms were located at the core of the cluster due to the higher surface and cohesive energy. The single platinum atom with the highest cohesive energy in Pd12Pt1Ag42 nanoalloy was located at the center of the cluster. Also in all other compositions except Pd13Ag42 . . ., Pd atoms occupy the second shell position of the icosahedron structure. We used classical molecular dynamics (MD) simulations in canonical ensemble conditions (NVT) to investigate the melting temperatures of ternary PdmPt(13-m)Ag42 nanoalloys with the interatomic interactions modeled by the same potential with optimizations. The icosahedral structures were taken as the initial configurations for MD simulations. We obtained caloric curves and Lindemann indexes to investigate the melting transitions. The simulation results showed that varying the composition gives rise to a fluctuation in melting temperatures. The highest melting temperature belongs to the Pd9Pt4Ag42 nanoalloy cluster within the other compositions. However, the relative stability investigation indicates the Pd8Pt5Ag42 nanoalloy cluster as the most stable composition. The Lindemann indexes obtained for the second and third shell of icosahedral structures show that the melting takes place as a whole without any surface premelting Daha fazlası Daha az

Comparison of test use and multiple-evaluation to test effectiveness of PBL in different grouping strategies

Yaman, Suleyman


Problem-based learning (PBL) involves the process of working toward the understanding or solution of a problem. In educational contexts, PBL provides meaningful problems to improve learning. This study aims to investigate the comparative effectiveness of the achievement test and of multiple evaluation methods, including test use, self, peer, and tutor-evaluation, in PBL environments. Different grouping strategies, specifically tutor- and student-based selection, are used to test effectiveness of the evaluation approaches. The study was conducted with 46 prospective teachers using an experimental design. For the purpose of the study, . . . t-test for independent groups and correlation analysis were used. The prospective teachers in the tutor-selected group were found to be more successful when the complete results of the evaluations were considered. The use of multiple evaluation methods revealed a significant difference between groups, whereas the approach using only the achievement test did not show any statistically significant difference Daha fazlası Daha az

Air Pollution And The Risk Of Venous Thromboembolism

Tor, M. | Cevik, C. | Kurcer, M. | Akbulut, S. | Altuntas, M. | Atalay, F.


WOS: 000208771000726

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