Yazar "Bakirci, Nadi" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Load sharing within a human thoracic vertebral body: An in vitro biomechanical study
    (Turkish Neurosurgical Soc, 2007) Kilincer, Cumhur; Inceglu, Serkan; Sohn, Moon Jun; Ferrara, Lisa A.; Bakirci, Nadi; Benzel, Edward C.
    OBJECTIVE: The vertebral body is the major load bearing part of the vertebra and consists of a central trabecular core surrounded by a thin cortical shell. The aim of this in vitro biomechanical study is to determine the debated issue of load sharing in a vertebral body. METHODS: A series of non-destructive compressive testing on excised human thoracic vertebral bodies were performed. The testing process consisted of a stepwise removal of the vertebrae's trabecular centrum and measurement of surface strains. RESULTS: Load sharing of cortical shell of osteopenic vertebrae (48.1+/-7.6) was significantly higher than that of normal vertebrae (44.3+/-10.6). Load sharing of middle thoracic vertebrae (49.4+/-10.0) was significantly higher than that of lower thoracic vertebrae (42.4+/-8.5). According to general linear model analysis, test speed and load were not found to be effectual on load sharing with the exception that osteopenic vertebrae showed lower cortical load sharing under higher loads. CONCLUSIONS: The cortical shell takes nearly 45% of physiological loads acting upon an isolated thoracic vertebra. Load sharing between cortical shell and trabecular centrum is significantly affected by spinal level and bone mineral density. The load borne by trabecular bone increases towards the lower spinal levels, and decreases by osteoporosis.
  • Küçük Resim Yok
    Öğe
    Relationship Between Motivational Orientations, Metacognitive Adaptations and Academic Successes of Doctorate Students
    (Tuba-Turkish Acad Sciences, 2018) Gayef, Albena; Gulpinar, Mehmet Ali; Bakirci, Nadi; Yegen, Berrak C.
    Motivational orientations and metacognitive adaptations displayed in difficult situations are the two major factors that affect the academic success of students. The aim of this study is to examine relationship between motivational orientations, metacognitive adaptations and academic successes of doctorate students attending to Health Sciences Institute. In this study conducted on 139 students The Modified Archer's Health Professions Motivation Survey, The Positive Metacognitions and Positive Meta-Emotions Questionnaire and performance evaluation forms were used. In the study where metacognitive adaptation levels of doctorate students were found high, their self-confidence levels in extinguishing perseverative thoughts and emotions were found to be significantly different in comparison to their levels of goal orientations towards performance, academic alienation and their use of superficial learning strategies. Their self-confidence levels in interpreting own emotions as cues, restraining from immediate reaction and mind setting for problem solving, establishing flexible and feasible hierarchy of goals were also found to be significantly different in comparison to their levels of academic alienation, use of metacognitive learning strategies, and internal control (p<0.05). It was also observed that academic success of the students at course and thesis stages were found to be significantly different as compared to their level of metacognitive learning strategies, self-confidence levels for setting flexible/feasible hierarchy of goals (p<0.05).