1,722,192 research outputs found
Renewable energy perspectives in the frame of Turkey's and the EU's energy policies
No full textRenewable energy as one of the current and substantial issue needs to be investigated in terms of political outlook. So the researches on renewable energy policies under the energy policies of different countries are necessary. The emergence of renewable energy policy was the 20th century but it gained momentum in 21st century. The realization of the polluting nature of the petroleum products, their negative environment effects and the assumptions about the future of non-renewable energy sources were the driving forces behind these politics. The European Union in these conditions tries to play pioneer role. Turkey on the other hand as a candidate country has to harmonize its policies with the Union's. In this context, objective of this work is to examine the EU and Turkey's renewable energy policies, make a comparison and as a sustainability of Turkish renewable energy policy construct a future projection in short, medium and long terms. (C) 2012 Elsevier Ltd. All rights reserved
Experimental investigation on the thermal performance of heat recovery system with gravity assisted heat pipe charged with R134a and R410A
No full textThe purpose of this study is to investigate the thermal performance of heat recovery system with gravity assisted heat pipe charged R134a and R410A working fluids and also determine the usefulness of heat pipe bundle system in heat recovery applications. For this purpose an experimental test rig was designed and built. Series of experimental tests were carried out by varying the flue gas temperature (75, 100, 125, 150 and 175 degrees C), flue gas velocity (1, 1.5, 2 and 2.5 m/s) and cooling water flow rates (1, 2, 3 and 4 l/min). Values of the overall effectiveness of the heat pipe heat recovery system are shown to vary with the flue gas velocity, as expected, but the results also allow the prediction of effectiveness variation with the variation of the flue gas temperature. Effectiveness of the heat pipe for both working fluids R134a and R410A has been varied averagely between 35.6% and 57.7% with a good agreement with the published results. Quantitatively, it is found that R134a working fluid is 14% more effective than R410A in heat pipe bundle system. (C) 2016 Elsevier Ltd. All rights reserved
Europe to lose if it fails to integrate with Turkey, Belgian professor says
No full textAn extended interview:
How successful has integration of Turkish migrants been in Belgium?
What about integration of Turkey in Europe?status: Publishe
Compressed Biogas-Diesel Dual-Fuel Engine Optimization Study for Ultralow Emission
No full textThe aim of this study is to find out the optimum operating conditions in a diesel engine fueled with compressed biogas (CBG) and pilot diesel dual-fuel. One-dimensional (1D) and three-dimensional (3D) computational fluid dynamics (CFD) code and multiobjective optimization code were employed to investigate the influence of CBG-diesel dual-fuel combustion performance and exhaust emissions on a diesel engine. In this paper, 1D engine code and multiobjective optimization code were coupled and evaluated about 15000 cases to define the proper boundary conditions. In addition, selected single diesel fuel (dodecane) and dual-fuel (CBG-diesel) combustion modes were modeled to compare the engine performances and exhaust emission characteristics by using CFD code under various operating conditions. In optimization study, start of pilot diesel fuel injection, CBG-diesel flow rate, and engine speed were optimized and selected cases were compared using CFD code. CBG and diesel fuels were defined as leading reactants using user defined code. The results showed that significantly lower NOx emissions were emitted under dual-fuel operation for all cases compared to single-fuel mode at all engine load conditions
Comparison of estimated occupational health and safety costs with actual costs in maintenance and repair projects of public buildings
Full text linkYILMAZ, Mustafa/0000-0001-9929-910XWOS: 000494129100001PubMed: 31462172Public building stock in Turkey is getting older and more funds are transferred for repairs and maintenance of these public buildings. Parallel to this growth, a significant increase is observed in the number of occupational accidents occurring in the Turkish construction sector. This case study focuses on compulsory investments in small or middle-scale repairs and maintenance projects of public buildings. In the determination of occupational health and safety (OHS) costs which are an integral part of the project costs, a model combining risk-based activity analysis and activity-based cost analysis is utilized and computer software developed as a calculation instrument for this model is used. The ratio of actual and estimated OHS costs to the approximate cost was found to be 3.98 and 3.58%, respectively. Further research should be conducted to test the reliability of this model and its calculation tool in estimating the actual OHS cost before the tender stage
Experimental investigation of granular flow through an orifice
No full textThe characteristics of continuous, steady granular flow through a flat-plate orifice have been experimentally investigated. In particular, the normal stress exerted on the orifice plate has been measured by the normal stress gauge which consists of a strain gauge attached to a cantilever beam. The cantilever beam supports the orifice plate which is freely hanging, and thus normal stresses on the orifice plate have been measured by strains developed in the beam due to normal forces on the plate by particles. Discharge rates of granular particles through the orifice have, therefore, been studied as a function of the average normal stress on the orifice plate. The results show that granular flows through the orifice are characterized by three regimes. When the flow is not choked, the discharge rate increases with the increasing normal stress (Regime I). With the further increase of the normal stress, the discharge rate reaches a maximum, at which the flow appears to start choking. Once the flow becomes choked, the discharge rate starts decreasing (Regime II) for further increase of the normal stress and then becomes independent of the normal stress on the orifice plate (Regime III). The transitional Regime II where the discharge rate decreases with the increasing normal stress is observed to be unstable. The asymptotic discharge rates at Regime III for various orifice sizes and particle sizes are in good agreement with results available in the literature. The maximum discharge rates, which are observed when choking just starts, exceed the asymptotic discharge rates by approximately 20-30%. (c) 2007 Elsevier B.V. All rights reserved
A review of regression diagnostics for behavioral research
No full textInfluential data points can affect the results of
a regression analysis; for example, the usual summary
statistics and tests of significance may be
misleading. The importance of regression
diagnostics in detecting influential points is
discussed, and five statistics are recommended for
the applied researcher. The suggested diagnostics
were used on a small dataset to detect an influential
data point, and the effects were analyzed.
Colinearity-based diagnostics also are discussed
and illustrated on the same dataset. The nonrobustness
of the least squares estimates in the
presence of influential points is emphasized.
Diagnostics for multiple influential points, multivariate
regression, multicolinearity, nonlinear
regression, and other multivariate procedures also
are discussed. Index terms: Andrew-Pregibon
measure, colinearity, Cook’s distance, covariance
ratio, influential observations, measurement error,
partial residual plot, regression diagnostics.Chatterjee, Sangit; Yilmaz, Mustafa. (1992). A review of regression diagnostics for behavioral research. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/115650
L-proline derivatives based on a calix[4]arene scaffold as chiral organocatalysts for the direct asymmetric aldol reaction in water
No full textYILMAZ, Mustafa/0000-0003-2904-160XWOS: 000373283800004A new series of water-compatible proline catalysts (4-6) derived from calixarene bearing a hydrophobic nature have been synthesised. It was found that the compound 4 was a highly efficient organocatalyst for aldol reactions occurred in the water. Under optimised reaction conditions, high yields (up to 82%), good enantioselectivities (ee up to 81%) and high diastereoselectivities (dr up to 91:9) were obtained.Scientific and Technological Research Council of Turkey [TUBITAK]Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [112T349]; Scientific and Technological Research Council of Turkey [TUBITAK CMST COST Action]Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [CM1005]; Research Foundation of Selcuk University (BAP)Selcuk UniversityThis work supported by Scientific and Technological Research Council of Turkey [TUBITAK grant number 112T349 and CMST COST Action CM1005], and the Research Foundation of Selcuk University (BAP)
DEMOGRAPHIC AND CLINICAL FINDINGS OF EPILEPSY PATIENTS WHO UNDERWENT FOLLOW-UP AT THE NEWLY ESTABLISHED CLINIC OF MUGLA UNIVERSITY FACULTY OF MEDICINE
No full textWOS: 000425754400460[No abstract available
- …
