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- 저자 : Teomete, Mehmet (검색결과 3 건)
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Roughness Damage Evolution Due to Wire Saw Process
Egemen Teomete 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
The wire saw process is widely used for silicon wafer production with high yield and low surface damage in solar cell and microelectronics industries. The wire saw process is used to machine brittle materials in the ductile regime where high yield and low surface damage are desired. The wire saw process is also used to cut concrete and rocks in civil engineering. In this study, an experimental parametric study was conducted by varying process parameters to determine surface roughness damage. Ductile regime material removal by trans-granular failure and brittle fracture by inter-granular failure are observed in electron micrographs of the cut surfaces. A damage model that relates the roughness damage to process parameters was derived. The damage model predicts the roughness damage satisfactorily. The model shows that the roughness damage is proportional to the ratio of feed speed to wire speed. Improvement in the efficiency of the process without increasing the roughness damage can be attained by increasing the feed speed proportionally to wire speed. Wire tension does not affect roughness damage. Roughness damage, however, is affected by properties of the wire. Wires having smaller grit radius and small grit spacing cause less roughness damage.
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Cabuk, Devrim,Basaran, Gul,Teomete, Mehmet,Dane, Faysal,Korkmaz, Taner,Seber, Selcuk,Telli, Ferhat,Yumuk, Perran Fulden,Turhal, Serdar Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.1
Background: Breast cancer is the most common malignancy and the second leading cause of cancer-related death among women in the developed countries. Despite advances in screening, improved local therapies and adjuvant systemic treatments, median survival of metastatic breast cancer patients (MBC) is in the range of 2-3 years at most. We aimed to investigate whether the prognostic factors and therapeutic responses of our Turkish patients are similar to those in the literature. Materials and Methods: We reviewed the medical records of MBC patients who had been treated in our institution between 1999-2009 and analyzed their clinicopathological features and survival outcomes retrospectively Results: A hundred and sixty patients were included. Median age was 47 (23-82), median follow up was 24 (2-186) months. At the time of diagnosis 59% of patients were under the age of 50 and 46% were postmenopausal. The majority (37%) had multiple sites of metastases. Forty percent received endocrine therapy and 40% chemotherapy as first line metastatic treatment. Thirty (20%) patients were treated with molecular targeting agents like trastuzumab, lapatinib and sunitinib, frequently combined with a chemotherapy agent. Five-year overall survival (OS) was 32% and median OS was 38 months for the whole group. Five year progression free survival (PFS) was 10% and median PFS was 10 months. Menopausal status, hormone receptor expression and disease free status had a significant impact on overall survival in the multivariate analysis (p 0.018, p 0.018 and p:0.003, respectively). Conclusions: All our patients were treated with the modern oncologic therapies recommended by the international guidelines. From our data, MBC patients live up to 3-4 years, indicating that further improvement beyond that requires development of new treatment modalities. The survival outcomes of our patients were consistent with the data reported in the literature.
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Theoretical and experimental investigation of piezoresistivity of brass fiber reinforced concrete
Aurore Mugisha,Egemen Teomete 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.23 No.6
Structural health monitoring is important for the safety of lives and asset management. In this study, numerical models were developed for the piezoresistive behavior of smart concrete based on finite element (FE) method. Finite element models were calibrated with experimental data collected from compression test. The compression test was performed on smart concrete cube specimens with 75 mm dimensions. Smart concrete was made of cement CEM II 42.5 R, silica fume, fine and coarse crushed limestone aggregates, brass fibers and plasticizer. During the compression test, electrical resistance change and compressive strain measurements were conducted simultaneously. Smart concrete had a strong linear relationship between strain and electrical resistance change due to its piezoresistive function. The piezoresistivity of the smart concrete was modeled by FE method. Twenty-noded solid brick elements were used to model the smart concrete specimens in the finite element platform of Ansys. The numerical results were determined for strain induced resistivity change. The electrical resistivity of simulated smart concrete decreased with applied strain, as found in experimental investigation. The numerical findings are in good agreement with the experimental results.
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