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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

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

Examining with Discrimanant Analysis the Differences of Automobile Consumers at the Stage of Information Searching in Zonguldak Region

Albayrak, Ali Sait | Aksoy, Ramazan

Article | 2007 | Yönetim Dergisi:İstanbul Üniversitesi İşletme Fakültesi İşletme İktisadı Enstitüsü18 ( 56 ) , pp.40 - 52

Satın alma sürecinde tüketicilerin bilgi edinmeleri aşaması en sorunlu aşamadır. Bu aşamada, tüketiciler hangi bilgi kaynaklarına başvuracağına karar vermede önemli güçlüklerle karşılaşmaktadır. Bu çalışmada otomobil tüketicilerinin cinsiyet, medeni durum, eğitim düzeyi, gelir düzeyi, yaş grubu ve otomobil sahipliliği yönünden bilgi türleri ve bilgi kaynaklan itibariyle farklılık gösterip göstermediği diskriminant analiziyle araştırılmaktadır. Diskriminant analizi, varsayımları (çoklu normal dağılım, eşit kovaryans, çoklu doğrusal bağlantı ve doğrusallık) sağlanması durumunda en uygun sınıflandırma tekniğidir. Diskriminant analizini . . .n sonuçları otomobil tüketicileri arasında cinsiyet, medeni durum, eğitim ve gelir düzeyi, yaş grubu ve otomobil sahipliliği yönünden bilgi türleri ve bilgi kaynakları itibariyle anlamlı farklılıkların olduğunu göstermektedir. Consumers' information search is the most troubled phase of the purchasing decision process. In this phase, consumers have trouble deciding which information type and information source to approach. In this study, whether consumers differ by their sex, marital status, educational level, income level, age group and ownership of goods in respect to their demand for information type and preferred information source is examined with discriminant analysis. When the assumptions (multivariate normality, equal covariance matrices, multicolinearity and linearity) of discriminant analysis are met, then discriminant analysis is the most appropriate classification technique. The discriminant analysis results point out that the discriminant functions of sex, marital status, educational level, income level, age group and ownership of goods in respect to their demand for information type and preferred information source account for a meaningful proportion of the differences among the groups Daha fazlası Daha az

Internet Bankacılığı Kullanımında Güvenlik Unsurlarının Bilinirliği (Anket Uygulamasına Dayalı SPSS Çözümlemesi)

Barışık, Salih | Temel, Halime

Article | 2007 | Karamanoğlu Mehmetbey Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi0 ( 13 ) , pp.136 - 160

İnternetin insan yaşamına sağladığı kolaylıklar internet kullanımının yaygınlaşmasını hızlandırmaktadır. Bu yaygınlaşmanın bankacılık sektöründe de yaşanmasına rağmen, internet bankacılığı kullanımı artışıyla birlikte internet bankacılığına yönelik saldırılarla dolandırıcılık yapılabilmektedir. Dolandırılıcılık haberleri internet bankacılığına güven sorununu ortaya çıkarmıştır. İnternet bankacılığı güvenlik unsurlarının bilinilirliğinin internet bankacılığı kullanımında etkin olduğu düşünülmektedir. Bu amaçla güvenlik unsurlarının bilinilirliği ve kullamlırlığını tespit etmeye yönelik pilot bir uygulama yapmak amaçlanmıştır. Uygulam . . .a ile internet bankacılığına güven duyup duyulmadığı, internet bankacılığı kullanımında en çok yapılan işlemler ve internet bankacılığı kullanımında güvenlik unsurlarının' bilinirliğini ve kullanımı tespit edilmeye çalışılmıştır. Çalışmada, Zonguldak Karaelmas Üniversitesi İktisadi ve İdari Bilimler Fakültesi öğrencileri ve öğretim elemanları örneklem seçilmiştir. İnternet bankacılığının ve güvenilirliğinin bilinilirliğinin öğrenciler ve öğretim üyeleri arasında farklı olduğu, bu farklılığın kullanımı etkilediği gözlenmiştir. Bankaların internet bankacılığını yaygınlaştırabilmek için internet bankacılığı hizmetlerinin yanı sıra internet bankacılığı güvenlik sistemlerini tanıtması gerekmektedir. The facilities provided by the internet bring about its wide usage. Banking sector is one of the leading sectors in which internetprovided- services are used extensively. However, the cases of internet fraud is also spreading as a result of this wide-spread usage. This situation causes a trust problem in the internet banking sector. The knowledge of internet security is an important element in convincing people to use internet banking effectively. The aim of this study is to determine the level of internet-banking-users' knowledge of internet security, most frequently used internet banking services and seriousness of the trust problem in using internet banking. The faculty and the students of the Zonguldak Karaelmas University, Faculty of Economics and Administrative Sciences constitute the sample of this study. The results indicate that the knowledge in internet security differs between the students and the faculty, and this difference affects the use of internet banking. This result suggests that in order to increase the volume of internet banking, banks need to introduce not only their internet banking services but also the security systems which increase the trustworthiness of internet banking 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

Elemen black pine, a new monumental tree in Dirgine forests Zonguldak

Yaman, Barbaros | Saribas, Metin

Article | 2007 | EKOLOJI16 ( 63 ) , pp.62 - 68

Turkey has monumental Black Pine trees among a great variety of monumental trees recorded in the literature. The old Black Pine (Pinus nigra subsp. pallasiana) in Elemen Plateau of Dirgine in Zonguldak, the monumental properties of which haven't been studied until now, is the subject of the present investigation. The.Elemen Black Pine has no folkloric, historical and mystic properties. However, since its Present Monumental Point (PMP) is higher than Minimal Monumental Point (MMPspecies) of Black Pines, it is a dimensional monument tree. Elemen Black Pine should be considered important as a new addition to the monumental tree invento . . .ry of Black Sea Region of Turkey, and it should be registered officially as a dimensional monumental tree by Ministry of Environment and Forestry of Repuclic of Turkey Daha fazlası Daha az

Design and testing of wall cabinet frames constructed with round mortise-and-tenon joints

Tankut, Ali N. | Tankut, Nurgul | Eckelman, Carl A.

Article | 2007 | FOREST PRODUCTS JOURNAL57 ( 3 ) , pp.18 - 22

This study investigated the design, construction, testing, and performance characteristics of wall cabinets constructed with round mortise-and-tenon joints that are suitable for use in classrooms, school libraries, and homes. Four wall cabinets, utilizing round mortise-and-tenon joints, were constructed to evaluate their performance. Tests indicated that the attachment of thin plywood panels to the frames increased overall cabinet stiffness by 62 and 70 percent for red oak and yellow-poplar wall cabinets, respectively. Also, wood species was found to affect creep deflection. Overall, this study clearly demonstrated that wall cabinet . . .s constructed with round mortise-and-tenon joints were able to withstand normal service loads without loss of structural integrity or function Daha fazlası Daha az

An investigation on the production of dual-phase steel from AISI4140 and its impact strength at different martensite volume fractions

Demir B.

Article | 2007 | Metallofizika i Noveishie Tekhnologii29 ( 9 ) , pp.1159 - 1166

In this study, production of dual-phase steel from AISI 4140 steel having 0.44% C, 0.35% Si, 0.71% Mn, 1.13% Cr, 0.17% Mo and its impact strength at different martensite volume fractions (MVF) are determined. Dual-phase steel production is accomplished by intercritically annealing at intercritical temperatures (? + ? region, between 740°C and 795°C) and then by water quenching. By doing so, change in the MVF with intercritical annealing temperature (ICAT) of AISI 4140 steel is controlled. 743°C and 748°C are decided as ICAT for producing dual-phase steel impact test specimens with different MVF. For comparison, impact tests are also . . . carried out on as-received, quenched, quenched-tempered and normalized specimens. Results show that dual-phase steel having min MVF manifests considerable higher impact energy than all the specimens except for that of the samples quenched-tempered. As a result, dual-phase microstructure produced from AISI 4140 increased the toughness significantly Daha fazlası Daha az

Adaptive neuro-fuzzy modelling of anaerobic digestion of primary sedimentation sludge

Cakmakci M.

Article | 2007 | Bioprocess and Biosystems Engineering30 ( 5 ) , pp.349 - 357

Modelling of anaerobic digestion systems is difficult because their performance is complex and varies significantly with influent characteristics and operational conditions. In this study, Adaptive Neuro-Fuzzy Inference System (ANFIS) were used for modelling of anaerobic digestion system of primary sludge of Kayseri municipal WasteWater Treatment Plant (WWTP). Effluent Volatile Solid (VS) and methane yield were predicted by the ANFIS. Two stage models were performed. In the first stage, effluent VS concentration was predicted using pH, VS concentration, flowrate of pre-thickened sludge and temperature of the influent as input parame . . .ters. In the second stage, effluent VS concentration in addition to first stage input parameters were used as input parameters to predict methane yield. The low Root Mean Square Error (RMSE) and high Index of agreement (IA) values were obtained with subtractive clustering method of a first order Sugeno type inference. The model performance was evaluated with statistical parameters. According to statistical evaluations, the models satisfactorily predict effluent VS concentration and methane yield. © 2007 Springer-Verlag Daha fazlası Daha az

Synthesis and antimicrobial activity of some novel furyl and benzimidazole substituted benzyl ethers

Güven Ö.Ö. | Erdogan T. | Göker H. | Yildiz S.

Article | 2007 | Journal of Heterocyclic Chemistry44 ( 3 ) , pp.731 - 734

(Chemical Equation Presented) In this study, a series of novel furyl and benzimidazole substituted benzyl ethers were synthesized and evaluated for antibacterial and antifungal activities against S. aureus, Methicillin resistant S. aureus (MRSA), E. coli, C. albicans and C. krusei. Compound 6f and 6h exhibited the most potent anti-bacterial activity with lowest MIC values of 3.12 µg/mL against S aureus and MRSA, respectively.

Tartismali olgu

Mungan A. | Müezzinoglu T.

Article | 2007 | Turk Uroloji Dergisi33 ( 4 ) , pp.435 - 437

[No abstract available]

Genetics: Honey bees (Hymenoptera: Apidae) of African origin exist in non-Africanized areas of the southern United States: Evidence form mitochondrial DNA

Pinto M.A. | Sheppard W.S. | Johnston J.S. | Rubink W.L. | Coulson R.N. | Schiff N.M. | Kandemir I.

Article | 2007 | Annals of the Entomological Society of America100 ( 2 ) , pp.289 - 295

Descendents of Apis mellifera scutellata Lepeletier (Hymenoptera: Apidae) (the Africanized honey bee) arrived in the United States in 1990. Whether this was the first introduction is uncertain. A survey of feral honey bees from non-Africanized areas of the southern United States revealed three colonies (from Georgia, Texas, and New Mexico) with a diagnostic African mitochondrial DNA cytochrome b/Bg/II fragment pattern. To assess maternal origin of these colonies, we developed a primer pair for amplification of a cytochrome b fragment and sequenced using internal sequencing primers. Samples of the three reported honey bee colonies pl . . .us another 42 representing the 10 subspecies known to have been introduced in the United States were sequenced. Of the three colonies, the colonies from Texas and New Mexico matched subspecies of European maternal ancestry, whereas the colony from Georgia was of African ancestry. Contrary to expectations, the mitotype of the latter colony was more similar to that exhibited by sub-Saharan A. m. scutellata than to the mitotypes common in north African A. m. intermissa Maa or Portuguese and Spanish A. m. iberiensis Engel. This finding was consistent with anecdotal evidence that A. m. scutellata has been sporadically introduced into the United States before the arrival of the Africanized honey bee from South America. © 2007 Entomological Society of America Daha fazlası Daha az

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