3,556 research outputs found
How a public health crisis turned into a localised human security crisis in the Global South
No full textMobility restrictions, lockdowns, and economic slumps have endangered communities during the pandemic in the Global South. But a human security approach can help protect people’s lives by addressing the pandemic‘s multidimensional impact, writes Alexandra Abello-Colak (LSE Latin America and Caribbean Centre)
A Coordinated EV Charging Scheduling Containing PV System
No full textThe two main reasons for the increase in carbon emissions are the use of fossil fuel resources in the transportation and energy sector. It is possible to reduce these emissions significantly by expanding Electric Vehicles (EVs) in the transportation sector and renewable energy sources (RES) in electric power generation. While the adoption of EVs is still struggling for various reasons, such as battery costs and reduced range, rising fuel prices combined with government policy sanctions and incentives are increasing the need for EVs. The increased penetration of EVs on the grid is likely to pose a very complex operational problem. Therefore, this penetration can result in overloading of the infrastructure equipment in the distribution system and a power outage. This study focuses on the coordinated charge scheduling for EVs with a photovoltaic (PV) system as one of the Renewable energy sources for seamless integration of EVs into the grid. In this paper, charge scheduling of EVs has been made by considering the EV battery state of energy (SoE) value. Mixed Integer Linear programming (MILP) technique is used for the charge scheduling model of EVs. Thus, the charge scheduling of EVs is made within the allowable limits in the grid. It is also a systematic reference work in the proposed approach because of the load balancing of the EVs with the power supplied from the PV system. © 2022, ilhami Colak. All rights reserved
Quarries and characterisation of a hitherto unknown alabaster and marble from Thyatira (Akhisar, Turkey)
No full textCo-constructing security “from below”: A methodology to rethink and transform security in contexts of chronic violence
No full textA PROMOTER POLYMORPHISM IN THE PON1 GENE IS ASSOCIATED WITH ESSENTIAL HYPERTENSION
No full textColak, Ertugrul/0000-0003-3251-1043; Colak, Emine/0000-0002-6293-2909; Cosan, Didem Turgut/0000-0002-8488-6405Objective:
Increased vascular oxidative stress, the main risk factor of cardiovascular diseases, is seen as a role in the pathophysiology of essential hypertension. Genetic factors also play an important role in the formation of hypertension
Photovoltaic System Efficiency Enhancement With Thermal Management: Phase Changing Materials (pcm) With High Conductivity Inserts
No full textThe electrical conversion efficiency of photovoltaic cells from solar radiation heavily depends on the cell temperature. Here we propose a novel thermal management strategy to keep the cell temperature in the same order to attain maximum efficiency. The comparative study presented is based on four solar module configurations: a conventional photovoltaic module (PVT module), a conventional module with PCM layer underneath (PVT/PCM-I), a configuration where fins embedded into PCM (PVT/PCM-II), and configuration where the bottom of the PCM layer in PVT/PCM-II was cooled via convection (PVT/PCM-III). The developed 3D numerical model is solved via ANSYS software involving the solar ray tracing radiation model for incident solar radiations and a transient melting-solidification thermo-fluid model to cater for PCM phase transition. Results from the numerical model were validated via a comparison of experimentally studied results presented in the literature. After 120 minutes, results show that the conversion efficiency of PV cells becomes 16.84%, 18.65%, 18.83%, and 18.98% after 120 minutes for PVT module, PVT/PCM-I, PVT/PCM-II, and PVT/PCM-III with an inlet velocity of 3m/s, respectively. For the respective configurations, the specific electrical power per unit area produced reaches 75.30W/m2, 83.39W/m2, 84.19W/m2, and 89.42W/m2 for solar radiation of 540W/m2 and 26°C ambient temperature. Results reveal that a 5 mm increase in the fin height for PVT/PCM-II results in a 0.22% increase in efficiency while a 0.5m/s increase in the inlet velocity of the cooling air for PVT/PCM-III results in about 0.06% increase in efficiency. © 2021, ilhami Colak. All rights reserved
Tetrakis{2-[N-((3-morpholino)propyl)carbamateloxyethyl} zinc(II) phthalocyanine and its water soluble derivatives: Synthesis, photophysical, photochemical and protein binding properties
No full textIn this study, the novel water soluble derivatives of 2-[N-((3-morpholino)propyl)carbamate]oxyethyl substituted zinc(II) phthalocyanine (1) bearing different type of groups such as sulfobetaine (2), betaine (3), N-Oxide (4) and quaternized methyl (5) on the morpholine core were synthesized for the first time. All newly synthesized zinc(II) phthalocyanine derivatives were characterized by different spectroscopic techniques such as UV-vis, FT-IR, H-1 NMR, mass and elemental analysis as well. They showed excellent solubility in aqueous media due to their zwitterionic and ionic characters which makes them promising candidates for treatment of cancer by photodynamic therapy (PDT). The photophysical and photochemical properties were investigated in DMSO for tetrakis(2-[N-((3-morpholino)propyl)carbamate]oxyethyl} substituted zinc(II) phthalocyanine (1) and in both DMSO and water+Triton X-100 solutions for its water soluble ionic derivatives (2-5). The binding behaviors of ionic zinc(II) phthalocyanines by bovine serum albumin (BSA) protein were investigated for determination of transportation ability of these phthalocyanines in the blood circulation. (C) 2016 Elsevier B.V. All rights reserved
Organisering av ekonomiskt bistånd – Perspektiv på en integrerad och en specialiserad kommun
No full textAuthor: Merima Colak Title: Organization of financial assistance - Perspective on an integrated and a specialized municipality [translated title] Supervisor: Håkan Johansson Assessor: Staffan Blomberg The purpose of this study was to examine how specialized and integrated social services manage their social assistance. In addition to this the aim was to examine how social workers and officials working within these two forms of organizations experience discretion. Furthermore, a goal of this paper was also to examine if the social workers felt that any of these two organizational forms had any impact on the workload and how that in such case manifested. The study was conducted through a qualitative research method. Six social workers and officials were interviewed for the study. The results from the study demonstrated that the employees in the integrated organization had more general work tasks and that those in the specialized organization had their tasks divided on different units that were more specialized. Findings also showed that employees in each municipality interpret discretion differently. The social workers from the integrated organization interpreted discretion in terms of being able to affect their client’s case. The social workers from the specialized organization, on the other hand, defined discretion as being able to influence their own daily work tasks. Conclusively, the study showed that workload exists in both municipalities and that it was manageable in each of the municipalities, the workload was however higher in the specialized one but it was no burden on the employees in neither the specialized nor the integrated. Key words: Discretion, organizational structure, integrated and specialized organizations, social assistance, workload. Key words: handlingsutrymme, organisationsstruktur, integrerade och specialiserade organisationer, ekonomiskt bistånd, arbetsbelastning
Ischemia-modified albumin levels in professional male soccer players before and after training
No full textÖzbek, Aydın/0000-0001-5864-8166; Colak, Serap/0000-0003-3093-0607; Colak, Tuncay/0000-0002-9483-3243Objectives: The ischemia-modified albumin (IMA) test is a promising indicator of myocardial ischemia in the early diagnosis of the acute coronary syndrome (ACS). Recent studies examining alterations in IMA levels caused by myocardial ischemia that develops during exercise have shown contradictory results. There has been an increase in severe exercise-related cardiac events in football. We therefore, assessed IMA levels before and after exercise in professional soccer players in order to examine the effect of the exercise on IMA levels. Methods: Blood was collected from professional soccer players before and after exercise. IMA levels were measured by using spectrophotometric methods, and the albumin levels were measured in an autoanalyzer. Results: The average pre- and post exercise IMA levels of 16 soccer players were found to be 0.438 +/- 0.071 and 0.386 +/- 0.069, respectively. The pre-and post exercise albumin levels of the same group were 4.08 +/- 0.20 g/dL and 4.21 +/- 0.19 g/dL, respectively. There was a strong negative correlation between post exercise IMA and albumin levels, which was statistically significant (r = -0.535. p = 0.033). Conclusion: IMA levels should be examined not only in non-cardiac pathologies, but also in specific serum albumin concentrations and in individuals practicing vigorous sport activities
Modeling of a smart grid system using real time data on NEPLAN
No full textThe simulation model of the Smart Grids Laboratory of the Institute of Energy and Transport is presented in this paper and a day of its operation is analyzed. The developed model simulates six different modules (a photovoltaic array, a Li-ion battery storage system, a small wind turbine, a diesel generator, a laboratory load and the connection point with the grid). The modules are connected radially at a common bus
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