28 research outputs found
Yeniliklerin Dış Ticarete Etkileri Üzerine Mekansal Ekonometrik Bir Analiz: 2002-2009 Türkiye Örneği
Get PDFThis study deals with the interaction between innovations and foreign trade across NUTS2 (Nomenclature of Territorial Units for Statistics–2) regions of Turkey during the time period of 2002–2009. The aim of this study is to deal with the effects of innovations on the foreign trade, by considering the spatial effects across regions. In this context, the export booster and import dimmer effects of innovations are examined through estimating two separate models for export and import. Particularly, the import model has a special importance by investigating whether innovations can be a solution to Turkey’s chronic dependence on imported inputs. Besides, choice of the research sample as NUTS2 level, allows us to examine the clustering tendency of innovations, imports and exports. The evidences show that in both export and import models, innovations have significant and positive effects on dependent variables and this result proves that in Turkey innovations have a boost effect on both variables. In addition to these, the evidences related to testing spatial effect show that there is a clustering tendency for export, import and innovations. Also this result reveals that neighborhood relations are effective on the interaction between regions
System for and method of delivering sprayed particles
No full textA particle delivery device for producing a spray of particles in an ambient gas at an ambient pressure includes a storage volume for a liquid substance; a nozzle having an inlet and an outlet, the nozzle inlet being coupled to the storage volume in fluid communication, and an electric supply for providing an electric field between the nozzle outlet and a counter electrode. The storage volume is gastight, comprises a moveable wall and is adapted to provide the liquid substance to the nozzle inlet at ambient pressure level. The electric supply is arranged to control a release of the liquid substance from the nozzle outlet by a control of the electric field.Applied Science
Experiments on single event electrospraying
No full textIn order to use electrospraying as an on demand deposition method, well defined and reproducible single electrospraying events have been studied. To generate a single electrospraying event, rectangular voltage pulses superimposed on a constant bias voltage were applied, and optimum settings of the bias dc voltage for starting such an event were found. This onset point is related to a critical value of the effective surface tension before dripping starts.DelftChemTechApplied Science
Stability regime of pulse frequency for single event electrospraying
Get PDFThis study demonstrates that the hydrodynamic phenomena taking place inside the capillary limits the frequency range of voltage pulses for stable single event electrospraying (SEE), when the meniscus/cone size is defined by the inner diameter of the nozzle. For the analysis of SEE, we used a one-dimensional model describing the displacement and oscillations of the liquid inside the nozzle. The frequency range of voltage pulses for stable SEE is related to the natural oscillation frequency of the fluid column inside the capillary.DelftChemTechApplied Science
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OPTIMIZATION OF COAL PARTICLE FLOW PATTERNS IN LOW NOX BURNERS
Get PDFThe proposed research is directed at evaluating the effect of flame aerodynamics on NO{sub x} emissions from coal fired burners in a systematic manner. This fundamental research includes both experimental and modeling efforts being performed at the University of Arizona in collaboration with Purdue University. The objective of this effort is to develop rational design tools for optimizing low NO{sub x} burners to the kinetic emissions limit (below 0.2 lb./MMBTU). Experimental studies include both cold and hot flow evaluations of the following parameters: flame holder geometry, secondary air swirl, primary and secondary inlet air velocity, coal concentration in the primary air and coal particle size distribution. Hot flow experiments will also evaluate the effect of wall temperature on burner performance. Cold flow studies will be conducted with surrogate particles as well as pulverized coal. The cold flow furnace will be similar in size and geometry to the hot-flow furnace but will be designed to use a laser Doppler velocimeter/phase Doppler particle size analyzer. The results of these studies will be used to predict particle trajectories in the hot-flow furnace as well as to estimate the effect of flame holder geometry on furnace flow field. The hot-flow experiments will be conducted in a novel near-flame down-flow pulverized coal furnace. The furnace will be equipped with externally heated walls. Both reactors will be sized to minimize wall effects on particle flow fields. The cold-flow results will be compared with Fluent computation fluid dynamics model predictions and correlated with the hot-flow results with the overall goal of providing insight for novel low NO{sub x} burner geometry's
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Optimization of Coal Particle Flow Patterns in Low N0x Burners
Get PDFThe proposed research is directed at evaluating the effect of flame aerodynamics on NOX emissions tlom coal fired burners in a systematic manner. This fimdamental research includes both experimental and modeling efforts being petiormed at the University of Arizona in collaboration with Purdue University. The objective of this effort is to develop rational design tools for optimizing low NOX burners to the kinetic emissions limit (below 0.2 lb./MMBTU). Experimental studies include both cold and hot flow evaluations of the following parameters: flame holder geometry, secondary air swirl, primary and secondary inlet air velocity, coal concentration in the primary air and coal particle size distribution. Hot flow experiments will also evaluate the effect of wall temperature on burner performance. Cold flow studies will be conducted with surrogate particles as well as pulverized coal. The cold flow furnace will be similar in size and geometry to the hot-flow furnace but will be designed to use a laser Doppler velocimeter/phase Doppler particle size analyzer. The results of these studies will be used to predict particle trajectories in the hot-flow fhrnace as well as to estimate the effect of flame holder geometry on furnace flow field. The hot-flow experiments will be conducted in a novel near-flame down-flow pulverized coal furnace. The fhrnace will be equipped with externally heated walls. Both reactors will be sized to minimize wall effects on particle flow fields. The cold-flow results will be compared with Fluent computation fluid dynamics model predictions and correlated with the hot-flow results with the overall goal of providing insight for novel low NOX burner geometry's
Optimization of Coal Particle Flow Patterns in Low N0x Burners
No full textThe proposed research is directed at evaluating the effect of flame aerodynamics on NOX emissions tlom coal fired burners in a systematic manner. This fimdamental research includes both experimental and modeling efforts being petiormed at the University of Arizona in collaboration with Purdue University. The objective of this effort is to develop rational design tools for optimizing low NOX burners to the kinetic emissions limit (below 0.2 lb./MMBTU). Experimental studies include both cold and hot flow evaluations of the following parameters: flame holder geometry, secondary air swirl, primary and secondary inlet air velocity, coal concentration in the primary air and coal particle size distribution. Hot flow experiments will also evaluate the effect of wall temperature on burner performance. Cold flow studies will be conducted with surrogate particles as well as pulverized coal. The cold flow furnace will be similar in size and geometry to the hot-flow furnace but will be designed to use a laser Doppler velocimeter/phase Doppler particle size analyzer. The results of these studies will be used to predict particle trajectories in the hot-flow fhrnace as well as to estimate the effect of flame holder geometry on furnace flow field. The hot-flow experiments will be conducted in a novel near-flame down-flow pulverized coal furnace. The fhrnace will be equipped with externally heated walls. Both reactors will be sized to minimize wall effects on particle flow fields. The cold-flow results will be compared with Fluent computation fluid dynamics model predictions and correlated with the hot-flow results with the overall goal of providing insight for novel low NOX burner geometry's
Determinants of financial stress in emerging market economies: Are spatial effects important?
No full textThis study aims to analyse the determinants of financial stress and to show the impact of the spatial linkages between 13 emerging economies during 1996–2016. The 2007 Global Financial Crisis has once again showed that financial/economic turmoil of countries has negative effects on other economies. At this point, this study brings novelty to the existing literature by considering the effects of neighbour countries' macroeconomic variables on domestic financial stress and by focusing on financial stress interaction between emerging economies using spatial econometric methods. According to the estimation results, we find current account balance/GDP, economic growth, geopolitical risk and global risk are the most important determinants of financial stress. It is also observed that there is a strong interaction of financial stress among emerging market economies. While geographical linkage is the most important transmission channel of financial stress among those economies, financial and trade linkages also play an important role. © 2020 John Wiley & Sons, Ltd.Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAKA preliminary version of the paper was presented in the ICEESS18, International Conference on Empirical Economics and Social Sciences, June 29–30, Balıkesir/Turkey. The authors would like to thank the editor, Mark Taylor and the anonymous referees for their valuable comments that helped to improve the final version of this paper. The corresponding author gratefully acknowledges research support from the Scientific and Technological Research Council of Turkey (TUBITAK).
Process and apparatus for producing coated particles
No full textThe invention is directed to a process and apparatus for preparing coated particles, in particular a process for preparing particles that are coated with small particles using electrospraying. The coated particles produced according to the present invention find use for instance as catalysts or as pharmaceuticals. According to the invention a host particle is contacted in a gas stream where it is allowed to contact with one or more moving tribocharging particles, thus providing a charged host particle, which is subsequently contacted with charged guest particles in an electrospraying step.DelftChemTechApplied Science
