Can Z.S.,Marmara University |
Cakir E.,DSI Inc
Ozone: Science and Engineering | Year: 2010
Effluent from the Pasakoy Wastewater Treatment Plant was oxidized by using O3 and O3/H2O2. DOC, COD, UV254, total coliform, dissolved ozone and some endocrine disrupting compounds were monitored during oxidation. Results showed that O3 provided superior disinfection, however, lower reductions in DOC, COD and endocrine disrupting compounds were exhibited compared to O3/H2O2. The highest removal efficiency of DOC, COD and endocrine disrupting compounds were achieved at 0.5 molar ratio of O3/H2O2. The benefit of H2O2 addition for advanced oxidation reduced significantly when the mole ratio was increased to 2. Therefore, the mole ratio of H2O2 to O3 is a critical parameter for the design of wastewater oxidation by O3/H2O2. © 2010 International Ozone Association.
Relation of tectonic structure to groundwater flow in the Beypazari region, NW Anatolia, Turkey [Relation entre la structure tectonique et les flux d'eau souterraine dans la reégion de Beypazari, NO de l'Anatolie, Turquie]
Apaydin A.,DSI Inc
Hydrogeology Journal | Year: 2010
The Beypazari region in NW Anatolia (Turkey) is characterized by high water demand and stress on available water resources. Tectonic structures control the groundwater flow, hydraulic head and well yield in the study area, which is located in the central part of the Beypazari Neogen basin. The impact of major tectonic structures on groundwater flow in the Cakiloba-Karadoruk aquifer is described. This aquifer is of sedimentary composition and underwent tectonic deformation, post-Miocene, forming northeast-striking asymmetric synclines, anticlines, monoclines, high-angle reverse faults and N-S striking tensional faults. Some of these structures affect groundwater flow by separating the aquifer system into sub-compartments, each having unique recharge, boundary and flow conditions. The groundwater system is compartmentalized into three sub-systems under the impacts of the Zaviye and Kanliceviz faults: (1) Arisekisi, (2) Elmabeli and (3) Southern sub-systems. The southern part of the Arisekisi sub-system and the Southern sub-system are characterized by a syncline and the aquifer is confined in the central part of the syncline. The Elmabeli sub-system has unconfined conditions. Consequently, the effects of tectonic structures are shown to be important for selecting well locations, evaluating groundwater use, groundwater management, and contaminant control in the study area, and also in other tectonic regions. © 2010 Springer-Verlag.
Can B.Z.,DSI Inc |
Ceylan Z.,Ataturk University |
Kocakerim M.M.,Cankiri Karatekin University
Desalination and Water Treatment | Year: 2012
The adsorption of boron from aqueous solution containing boron by activated carbon impregnated with salicylic acid (ACISA) was studied in a batch system. In order to investigate the effect of initial boron concentration and temperature on boron adsorption capacity of ACISA; the equilibrium, kinetic and thermodynamic parameters were calculated. The adsorption capacity data were obtained by using Langmuir and Freundlich isotherm models and both models fitted well. The pseudo-first-order, pseudo-second-order and the intraparticle diffusion models were used to describe the kinetic parameters and the rate constants were evaluated. The experimental data fitted very well the pseudo-second-order kinetic model. The activation energy (Ea) calculated using the Arhenius equation was found to be 58.25 kJ mol-1. Various thermodynamic parameters such as Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) changes were computed and the results showed that the adsorption of boron onto ACISA was spontaneous and endothermic in nature. © 2012 Desalination Publications. All rights reserved.
Gomez C.,DSI Inc
Procedia Computer Science | Year: 2013
Routing is a key design factor to obtain the maximum performance out of interconnection networks. Depending on the number of routing options that packets may use, routing algorithms are classified into two categories. If the packet can only use a single predetermined path, routing is deterministic, whereas if several paths are available, it is adaptive. It is well-known that adaptive routing usually outperforms deterministic routing. However, adaptive routers are more complex and introduces out-of-order delivery of packets. In this paper, we take up the challenge of developing a deterministic routing algorithm for direct topologies that can obtain a similar performance than adaptive routing, while providing the inherent advantages of deterministic routing such as in-order delivery of packets and implementation simplicity. The proposed deterministic routing algorithm is aware of the HoL-blocking effect, and it is designed to reduce it, which, as known, it is a key contributor to degrade interconnection network performance. © 2013 The Authors. Published by Elsevier B.V.
Lauffer J.,DSI Inc
Proceedings for the Joint Conference: MFPT 2013 and ISA's 59th International Instrumentation Symposium, ISA 2013: Sensors and Systems for Reliability, Safety and Affordability | Year: 2013
Much effort has been made in the prediction of failures prior to occurrence. The fundamental theory behind this failure prediction is paramount to preventing critical system failures, where possible and practical. While much has been published on this subject, as well as practical demonstrations, important issues remain: 1) what is the confidence for Remaining Useful Life? 2) what prognostic information can be observed, and understood, at the system Health Management level? And 3) what is the impact on maintenance actions, cost, and Availability? With the preponderance of prognostic working groups, studies, and concept developments, much information on prognostics technology has been developed. A point here is, prognostics in this sense is advanced physics of failure driven CBM and not RCM based trend analysis. The question that is always lingering behind the theory is, how do we know the optimum candidates have been selected for prognostic testing? This question can now be added to previous three questions. The answer is, effective prognostics cannot exist on its own; it must be a subset of a systems engineering process! To have a truly effective system Health Management (not monitoring) design, a well-balanced and integrated model Based Diagnostics design solution must be developed.