Techno-economic analysis of high potential offshore wind farm locations in Turkey

The wind energy market is rapidly growing in Turkey which made it one of the top three countries in Europe, and the seventh in the world, in terms of wind power capacity addition in 2016. Turkey has high onshore and offshore wind power potential which is widely distributed across the country. However, there has been no offshore wind farm (OWF) in operation in Turkey. This paper performs a comprehensive techno-economic analysis of OWF projects in three of the most promising wind locations (namely, Bozcaada, Gokceada, and Bandirma). The optimal OWF sites are selected by applying a multi-criteria site selection method to Turkey's coastal regions. Technical analysis consists of annual energy production estimation using the Virtual Wind Farm model and development of various electrical system design topologies for the proposed OWF projects. A detailed economic feasibility analysis is then conducted using a discounted cash flow economic model that considers current Turkish renewable energy support schemes under various discount rates. Taking the OWF investor's perspective, this study accounts for the key economic indicators which are used in the decision-making processes. The results of various model runs are compared to determine the best options for the proposed OWF investments to be profitable. It is shown that the proposed OWF projects are economically feasible only in the case of meeting certain techno-economic conditions. The radial electrical design is proved to be the most cost-effective option. Among the proposed projects, the Bozcaada OWF appears to be the best investment option with a levelized cost of electricity (LCOE) of $81.85–109.55 per MWh while the Bandirma OWF is the least economically viable with an LCOE of$100.73–135.97 per MWh. The findings are extrapolated to suggest feasible recommendations for the investors and policy makers which will help to shape the offshore wind energy outlook of Turkey

Pitfalls in MR Imaging of Musculoskeletal Tumors

WOS: 000331281400008PubMed ID: 24515883A wide range of musculoskeletal tumors and tumor-like conditions may be encountered when patients undergo radiologic examinations. Although MR imaging is a powerful medical imaging method that has been used extensively in the evaluation of musculoskeletal tumors, nontumoral or tumorlike lesions may have similar imaging findings. The imaging features of certain normal, reactive, benign neoplastic, inflammatory, traumatic, or degenerative processes in the musculoskeletal system may mimic malignant tumors. Misinterpretation of the imaging findings can lead to inappropriate clinical management of the patient. We review and describe the MR imaging characteristics of nontumoral bone lesions that are located in the marrow cavity, cortical bone, or in both, and soft tissue lesions that may be misinterpreted as sarcoma

The Resonance Analysis Caused by Harmonics in Power Systems Including Thyristor Controlled Reactor

The static VAR compensators having fixed capacitor thyristor controlled reactor (FC-TCR) used to improve voltage stability in power systems are nonlinear elements. The fixed capacitor group will produce reactive power while the thyristor controlled reactor will consume reactive power in compensators having FC-TCR. Changing the firing angles of TCR provides the reactive power variation of the system since the reactive power production of capacitors is fixed at a determined voltage level. In some cases, the variation of these firing angles will cause the harmonics in the system. In this study, TCR\u27s are discussed to be harmonic sources and the resonance case caused by harmonics has been investigated with Fourier Matrix Model and MATLAB Software

Chronic Recurrent Multifocal Osteomyelitis

WOS: 000407732900005Chronic recurrent multifocal osteomyelitis (CRMO) is an autoinflamatory disorder (a nonbacterial osteomyelitis) frequently associated with other inflammatory conditions and characterized by bone pain and fever and waxing and waning periods. In this article, details of our CRMO cases were presented and recent research about its epidemiology, etiology, clinical features, histopathologic and radiological findings, and treatment are discussed

Solitary osteochondroma causing popliteal pseudoaneurysm that presented as a mass lesion

WOS: 000254343200006PubMed ID: 18092290Osteochondromas are the most frequently occurring bone tumors and can rarely lead to vascular complications. A 14-year-old boy with solitary exostosis of the right femur presented with a mass lesion at the posterior aspect of the thigh. Radiological studies demonstrated a popliteal artery pseudoaneurysm. In this case report, radiological findings of this lesion are reviewed

False-Positive I-131 Uptake in a Benign Bone Lesion on Post-therapy Scan

WOS: 000366819800014PubMed ID: 26252335A 56-year-old woman underwent near-total thyroidectomy and papillary thyroid carcinoma without extrathyroidal extension was diagnosed. The serum thyroglobulin (Tg) level was 2.4 g/L, and anti-Tg was negative when serum thyroid-stimulating hormone level was 85 IU/mL. She received 100 mCi (3.7 GBq) of I-131. Besides the residual thyroid tissue, a focal uptake in the left clavicular bone was seen on posttherapy I-131 images. Then, CT and MRI were performed to diagnosis. All imaging findings suggested that it was a benign bone cyst. At 6-month follow-up, the serum Tg level was undetectable with the thyroid-stimulating hormone level of more than 150 IU/mL

Exploring the offshore wind energy potential of Turkey based on multi-criteria site selection

Wind energy is the leading form of non-hydro renewable energy source in terms of installed capacity in Turkey. It is among the most promising option for Turkey to decrease the energy dependence of external primary energy resources such as national gas and oil that diversifies the domestic share of energy sources in the national energy mix. However, offshore wind energy deployment has not gained satisfactory attention even though the country is surrounded by seas on three of its sides. Exploring Turkey's offshore wind power potential becomes an important task to serve this energy policy. This study presents a methodological framework for finding the most suitable offshore wind farm locations, meeting various multi-layer site selection criteria. The offshore wind energy resource is first assessed using the wind energy potential for 55 coastal regions where the nearshore meteorological stations are available in Turkey. Following on this analysis, a multi-criteria site selection work is carried out to identify the most suitable areas for offshore wind development. Wind Atlas Analysis and Application Program (WAsP) is then used to conduct statistical analysis to identify the most promising offshore wind farm locations. According to the pre-processing step of the framework, Bozcaada, Bandirma, Gokceada, Inebolu, and Samandag coastlines are found to be the most suitable locations for offshore wind farm development. Finally, the offshore wind energy potential of Turkey is estimated by using the micro-sitting configuration of wind turbines, considering sea depth, main wind direction, and distance to shore for the most feasible project locations. It is found that total estimated offshore wind power capacity at the specified sites is 1,629 MW. Keywords: Offshore wind energy potential, Offshore wind farm, Site selection, Wind energy, Turke