Bulunan: 4.900 Adet 0.006 sn
Koleksiyon [20]
Tam Metin [2]
Yayın Türü [11]
Yazar [20]
Yayın Yılı [20]
Konu Başlıkları [20]
Yayıncı [20]
Yayın Dili [10]
Dergi Adı [20]
The Importance of Chert in Central Anatolia: Lessons from the Neolithic Assemblage at Çatalhöyük, Turkey

Nazaroff A.J. | Baysal A. | Çiftçi Y.

Article | 2013 | Geoarchaeology28 ( 4 ) , pp.340 - 362

This paper is a presentation of three sources of artifact-quality chert in Central Anatolia. A previous dearth of research focused on locating and characterizing such raw material sources has incorrectly colored our view of prehistoric economic practices. To remedy this situation, we have conducted a survey of various locales within Central Anatolia to test for the presence of artifact-quality materials. We make use of Individual Attribute Analysis (IAA) and Energy Dispersive X-ray Fluorescence (EDXRF) analysis to discriminate among these materials, and suggest their use by the Neolithic occupants of Çatalhöyük through similar analy . . .ses of artifactual materials. We argue that the presence and characterization of these new sources allows us to better understand the intricacies of Neolithic practices by illustrating the ways in which the consumption of these materials was variably entwined with the exploitation of other resources, as well as embedded within social relations outside of Central Anatolia. © 2013 Wiley Periodicals, Inc. Daha fazlası Daha az

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

Comparison of drillability and abrasivity properties of rocks [Kayaçlari{dotless}n delinebilirlik ve aşi{dotless}ndi{dotless}ri{dotless}ci{dotless}li{dotless}k özelliklerinin karşi{dotless}laşti{dotless}ri{dotless}lmasi{dotless}]

Çapik M. | Yilmaz A.O. | Yaşar S. | Yarali O. | Çavuşoglu I.

Conference Object | 2013 | 23rd International Mining Congress and Exhibition of Turkey, IMCET 20131 , pp.659 - 669

Drillability is defined as the penetration rate of a drill bit into the rock. Abrasion is broken off by the tools during the excavation of rocks. Different types of rock formations have different abrasiveness and hardness properties and that is significantly affected excavatability and drillability in the mechanical excavation systems. Because, abrasive rocks and hard rocks lead to an increase of the cost excavation, decrease of the penetration rate and atrophy of the cutter in a short time. This study was carried out in Hopa-Borcka (Artvin) Cankurtaran Highway Tunnel. Rock samples were obtained from Cankurtaran Tunnel at the changi . . .ng rock formations for the laboratory studies. The test samples were prepared at the appropriate size and quantity. Sievers J-miniature drill test (SJ) and the brittleness tests were carried out and for the drilling rate index values were calculated. Cerchar Abrasivity Index (CAI), Norway Abrasion Value (AV) and Bohme abrasion tests were carried out and for abrasiveness of rock properties. Uniaxial compressive strength, point load strength and Brazilian tensile strength tests were determined for the calculations mechanical properties of rock 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

A brief report of research: Care activities for deceased patients of intensive care nurses at a private hospital in Istanbul, Turkey

Çelik S. | Gürkan S. | Atlgan Y.

Article | 2009 | Dimensions of Critical Care Nursing28 ( 5 ) , pp.232 - 236

The purpose of this study was to determine nursing care for deceased patients among intensive care unit nurses. This prospective, observational study was conducted in Istanbul, Turkey. The sample consisted of 20 intensive care nurses caring for 39 deceased patients during the study period. Researchers observed the care activities of the nurses and these were recorded. All the nurses closed the curtains or placed screens to separate the deceased patient from others and to allow some privacy for the family. Two nurses allowed the family to participate in the care. There was no difference in care activities according to the religious a . . .ffiliation of the patients. © 2009 Lippincott Williams & Wilkins 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

The concept of continuing education for organizations and its effects

Somunoglu S. | Ofluoglu G.

Article | 2012 | Human Systems Management31 ( 03.Apr ) , pp.187 - 191

Currently, while considering the responsibilities of organizational activities, it is observed that there is a fast change in the present environment of organizations, the technology they exploit, the speed of the society's expectations. The nature of the change compels the organizations to acquire a more dynamic structure, to improve the skills that can be adapted to the surrounding area, to promote the quality of their staff, and to search ways to improve their operations. All these undertakings bring together the necessity of continuous learning in the organizations. Organizations acquire the structure of a learning organization . . .by apprehending the value of knowledge, accessing knowledge, and enhancing knowledge, at the point where they begin giving importance to education and development. In order to maintain its existence with the knowledge it has acquired, a learning organization is concerned with the ability to conform the organizational behaviour, to adopt learning as a manner of life, and to maintain continuing education activities. The learning organization ultimately learns from past experiences, solves the problems and adopts new approaches. This study covers continuing education in the organizations, concept of learning organization, the contribution of continuing education to the learning organization process, overall characteristic of the learning organization. © 2012 - IOS Press and the authors. All rights reserved Daha fazlası Daha az

Vibration analysis of euler-bernoulli beam based on the variational iteration method

Ozer H.

Conference Object | 2010 | 17th International Congress on Sound and Vibration 2010, ICSV 20104 , pp.2740 - 2745

The variational iteration method has been attracted much attention of researchers as a promising method for solving linear and nonlinear differential equations. This study presents a way of using the variational iteration method (VIM) to solve free vibration problems of uniform Euler-Bernoulli beams. The method depends on constructing a correction functional by a general Lagrange multiplier. An example is given to illustrate the accuracy and efficiency of the present method. Each iteration step gives a direct approximate solution to the problem. It is verified that the method is a powerful mathematical tool to get the solutions easi . . .ly by reducing the volume of calculations Daha fazlası Daha az

The assesment for CO2 sequestration potential by magnesium silicate minerals in Turkey: Cases of orhaneli-bursa and divrigi-sivas regions

Baris K. | Ozarslan A. | Sahin N.

Article | 2008 | Energy Exploration and Exploitation26 ( 5 ) , pp.293 - 309

This paper examines the CO2 sequestration potential of magnesium silicate minerals in Turkey for two example cases, the Orhaneli- Bursa and Divrigi -Sivas regions. The distribution and properties of the silicate mineral deposits are provided and the quantities of CO2 that can be sequestered in these deposits is estimated. The silicate minerals in the Orhaneli and Divrigi deposits provide significant CO2 sequestration capacity. Assuming 100% mineral carbonation efficiency, approximately 2.4 million tons/year of olivine and 6.5 million tons/year of serpentine would be required to sequester the CO2 released by the power plants investig . . .ated in this study. Although more detailed studies are needed, it is concluded that this approach has potential given Turkey's large dunite (olivine) and serpentine reserves. Furthermore, the proximity of these deposits and active open-pit mines to thermal power plants emitting CO2 facilitate the utilization of mineral carbonation Daha fazlası Daha az

The effect of process-based writing focused on metacognitive skills-oriented to fourth grade students' narrative writing skill

Kaya B. | Ateş S.

Article | 2016 | Egitim ve Bilim41 ( 187 ) , pp.137 - 164

Writing is the basis of success at school and is one of the important means of learning and assessment in various courses. Writing is one of the most important skills that students need to acquire and improve. In recent years, it seems that in the teaching of writing, the product-based work has been replaced with the process-based one. The latter requires tracking, assessment, and correction in the process of writing; in other words, it requires running with metacognitive skills. In this study used the simultaneous mixed method. Quasi-experimental method used in the quantitative part. Qualitative research method used in order to val . . .idate and expand the quantitative data with the qualitative ones, to support the obtained data and examine them profoundly with multi-perspective. The aim of this study was to discover to what extent the writing approach based on metacognitive skills would improve fourth grade students' skills in writing narrative texts, and to observe the changes occurring in their products and writing performances during the study. The study sample included 64 students in a public school in Eregli, Zonguldak (Turkey). The study used a mixed research method consisting of qualitative and quantitative methods to collect, analyze, and interpret the study data. In the implementation process, the experimental group performed their writing activities based on a process that focuses on metacognitive skills, and the control group performed their writing activities according to the Turkish curriculum. The study was conducted over eight weeks (28 hours) in the experimental group. The study analyzed students' skills in writing narrative texts and the use of metacognitive writing processes in the process of writing narrative text, and it was determined that there was a statistically significant difference between the groups to the advantage of the experimental group. It is observed that certain progress for each student in the experimental group in terms of the targeted metacognitive skills, but the control group students were not able to use such metacognitive skills adequately as tracking of the past writing, correcting when needed, or reorganizing. The results of this research are deemed to contribute to the limited literature on process-based writing skills and to help the primary school teachers enrich their teaching methods concerning the writing skill. Furthermore; the research is expected to be among the first examples in the area that emphasize the upper cognitive skills to lead further researches Daha fazlası Daha az

Wettability of tundish periclase lining by steel

Turen J. | Kosatepe K. | Karakas I. | Kandan E.

Article | 2006 | Refractories and Industrial Ceramics47 ( 1 ) , pp.68 - 73

Results of a study of the wettability of the tundish periclase lining by molten steel using a sessile drop method are presented. The wetting angle ? tends to decrease with increase in temperature and contact time on adding glass fiber and Fe2O3 powder in excess of 2% to the magnesite powder; a similar effect is observed in steels high in manganese. An increase in angle ? is observed on adding carbon fiber or glass fiber (not in excess of 1%) to the magnesite powder; the angle ? tends to increase with increase in MgO powder grain size and with carbon contained in steel in excess of 0.04%. © 2006 Springer Science+Business Media, Inc.

The influence of RET's on elementary and secondary grade teachers' views of scientific inquiry

Bahbah S. | Golden B.W. | Roseler K. | Elderle P. | Saka Y. | Shoutherland S.A.

Article | 2013 | International Education Studies6 ( 1 ) , pp.117 - 131

This study explores in-service elementary and secondary science teachers' conceptions of the Nature of Scientific Inquiry and the influence of participation in two different Research Experience for Teacher (RET) programs had on these conceptions. Participant teachers attended one of two six week RET programs in which they worked with scientists to engage in scientific inquiry. Before and after the RETs, teachers completed the Views of Scientific Inquiry (VOSI) questionnaire. Teachers' answers were analyzed to determine the degree of sophistication of their understanding of five facets of scientific inquiry. Both elementary and secon . . .dary teacher participants showed improvement in their understanding of nature of scientific inquiry as a result of program participation, and both programs were successful in supporting the development of inquiry conceptions, although secondary science teachers started and finished the RET's with a more sophisticated understandings of scientific inquiry. Areas of improvement for elementary teachers included the role of questions in science and the role subjectivity and creativity play in the processes of science, and for secondary teachers growth was seen in the role of questions, the relationship of data and evidence, the distinction of experiments and other means of investigations, and the varied methods of science. Implications of these results are discussed Daha fazlası Daha az

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