نتایج جستجو برای: glass structure
تعداد نتایج: 1629630 فیلتر نتایج به سال:
Findings from diverse subfields of vision research suggest a potential link between high-level aspects of face perception and concentric form-from-structure perception. To explore this relationship, typical adults performed two adaptation experiments and two masking experiments to test whether concentric, but not nonconcentric, Glass patterns (a type of form-from-structure stimulus) utilize a p...
background: a glass injury to the wrist and forearm is a common condition in adults and children that may cause significant discomfort and disability. this study was conducted to evaluate the accuracy of preoperative examination of this injury. methods: in this prospective study, among patients referred to kashani hospital in isfahan, iran from august 2006 to march 2008, 150 patients with glass...
It has proven difficult to articulate exactly how dispositions are related to subjunctive conditionals. The natural starting-point is a simple conditional analysis, according to which an object o is disposed to give response r to stimulus s if and only if, were o to undergo stimulus s, it would give response r. A glass is disposed to break when dropped, for example, if and only if it would brea...
شیشه های بیو اکتیو توانایی اتصال به بافت های زنده بدن را از طریق تشکیل یک لایه در فصل مشترکیان دارند. از شیشه های بیواکتیو به طور موفقیت آمیزی به عنوان پرکننده های استخوانی در ارتوپدی و جراحی دندان استفاده شده است. اکثر این شیشه ها بر پایه ی فرمول 45s5 می باشد. امروزه تحقیقات در زمینه تهیه شیشه های بیواکتیو از طریق واکنش های سل - ژل، توجه زیادی را به خود جلب کرده است. در این رشو یون های هیدروکس...
Great progress has been made in understanding the atomic structure of metallic glasses, but there is still no clear connection between atomic structure and glass-forming ability. Here we give new insights into perhaps the most important question in the field of amorphous metals: how can glass-forming ability be predicted from atomic structure? We give a new approach to modelling metallic glass ...
To investigate an amorphous structure of Ge(2)Sb(2)Te(5) that satisfies the 8-N rule (so-called 'ideal glass'), we perform alternative melt-quench simulations on Si(2)As(2)Se(5) and replace atoms in the final structure with Ge-Sb-Te. The resulting structures have salient features of the 8-N rule such as the tetrahedral configuration for all Ge atoms and the localized Te lone pairs at the valenc...
Miserite, as a type of calcium potasium silicate mineral, was characterized by J.D. Scott at 1975 in the form of a chain silicate structure according to Formula. The primary cell parameters and the positioning of all atoms in the cell were characterized by scott and he also denoted that in this structure, some impurities such as,,… were substituted by as solid solution. Beal were synthesized ...
Two-step sintering has been used to investigate the structure evolution and properties of the biogenic HA/glass composite containing 50 wt.% Na2O-B2O3-SiO2-based glass. The borosilicate glass facilitated the sintering process due to the viscous glass flow and stabilized the HA phase against thermal decomposition. It has been established that the structure significantly changes, becoming more ho...
abstract: the present thesis includes ; one preface and 11speeches , that each speech considered in different researches . the prefact part , studied grammer back ground , the first speech considered a brief description about grammatical credits . the second speech considered the different typs of sentences , from structure and meaning points of view . the third speech considered the verb es...
Glass-ceramic scaffolds mimicking the structure of cancellous bone were produced via sponge replication technique by using a polyurethane foam as template and glass powder below 30 lm as inorganic phase. Specifically, a SiO₂-based glass of complex composition and its corresponding P₂O₅-based "specular" glass were used as materials for scaffolding. The polymeric sponge was thermally removed and ...
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