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Search Results: 1 - 10 of 179 matches for " Yuksel; "
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Determination of Rennet Clotting Time by Texture Analysis Method  [PDF]
Zerrin Yuksel
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.411144

In this study, texture analysis method was used for the determination of rennet flocculation time (tfloc) and rennet clotting time (tclot) of rennet-induced reconstitued milk samples with different CaCl2 concentrations. The rennet flocculation time (RFT) and rennet clotting time (RCT) were also determined by using the Berridge test and sensory evaluation. The hardness value versus renneting time curves derived from texture analysis gave a good modified exponential relationship for each CaCl2 concentration and the curves were used to calculate flocculation time and clotting time parameters. It was found that the parameters (tfloc and tclot) appeared strongly correlated with RFT and RCT, respectively. Texture analysis was proved as a suitable method to control the rennet-induced coagulation and determine the rennet clotting time. It was also determined that enrichment of milk with CaCl2 leaded to a decrease in flocculation and clotting times and an increase in rate of clotting and gel hardness.

An Improved Ant Colony Optimization Algorithm for Construction Site Layout Problems  [PDF]
Gulben Calis, Orhan Yuksel
Journal of Building Construction and Planning Research (JBCPR) , 2015, DOI: 10.4236/jbcpr.2015.34022
Abstract: Meta-heuristic algorithms proved to find optimal solutions for combinatorial problems in many domains. Nevertheless, the efficiency of these algorithms highly depends on their parameter settings. In fact, finding appropriate settings of the algorithm’s parameters is considered to be a nontrivial task and is usually set manually to values that are known to give reasonable performance. In this paper, Ant Colony Optimization with Parametric Analysis (ACO-PA) is developed to overcome this drawback. The main feature of the ACO-PA is the ability of deciding the appropriate parameter values within the predefined parameter variations. Besides, a new approach which enables the pheromone information value to be proportional to the heuristic information value is introduced. The effectiveness of the proposed algorithm is investigated through the application of the algorithm to the construction site layout problems taken from the state-of-art. Results show that the ACO-PA can reduce transportation cost up to 16.8% compared to the site layouts generated by Genetic Algorithms and basic ACO. Moreover, the effects of parameter settings on the generated solutions are investigated.
Predicting Cotton Seedling Emergence for Cold Tolerance: Gossypium hirsutum L.
Yuksel BOLEK
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2010,
Abstract: Breeding cotton for stress tolerance is a priory of most cotton breeding programs. One of the stresses for cotton is cold that affects lint and yield quality. A total of 95 cotton genotypes belonging to G. hirsutum L. were screened at 5 different laboratory tests to determine the best screening test to predict field emergence. Field emergence percentages ranged from 38% to 77% for the 28th day after planting. A standard germination test was performed at 30oC. Cool germination percentages were measured at 13oC, 15oC and 18oC. Multiple regressions were used to determine the degree of association between variables. Predicting field emergence with combinations of 30oC and 18oC tests was better than other tests alone.
Recent Developments of Corporate Governance in the Global Economy and the New Turkish Commercial Draft Law Reforms
Cuneyt Yuksel
Journal of International Commercial Law and Technology , 2008,
Abstract: Corporate governance in a globalized economy has become one of the most important topics for the business environment and the governments. The proper implementation of corporate governance regulations by the companies bring out advantages for companies and the countries. High quality status of corporate governance means low capital cost, increase in financial capabilities and liquidity, ability of overcoming crises more easily and prevention of the exclusion of soundly managed companies from the capital markets. For years, the OECD has been working to promote use of the corporate governance principles since they were first issued in 1999 and revised in 2004 to support good corporate governance policy and practice both within OECD countries and beyond. In accordance with the developments in the global market the Capital Markets Board of Turkey issued the corporate governance principles of Turkey for the listed companies in June 2003 and amended these principles in 2005. Most recently, the new Turkish Commercial Draft Law proposes important changes and reforms for corporate governance in Turkey.
Effect of Municipal Waste Compost on Some Chemical Characteristics of Clay Soils
Orhan Yuksel
Journal of Agronomy , 2004,
Abstract: The objective of this study was to determine the effect of different concentrations of municipal waste compost (0, 40, 80, 120 and 160 t ha-1) on soil chemical properties of Vertisol and Non-calcareous Brown Soils. According to results of soil that sampled from pots, waste compost application to soil increased soil total nitrogen (TN), phosphorus (P2O5) and potassium (K2O) compared to control. 160 t ha-1 compost application levels resulted in the highest organic matter, TN and K2O among applied doses for both soil types
Predicting Cotton Seedling Emergence for Cold Tolerance: Gossypium barbadense
Yuksel Bolek
Journal of Agronomy , 2006,
Abstract: A total of 9 genotypes from G. barbadense were screened at 5 different tests to determine the best screening test to predict field emergence. Warm germination percentage was measured at 30°C and ranged from 87.5 to 99.2%. Cool germination percentages were measured at 13, 15 and 18°C. Multiple regressions were used to determine degree of association between variables. Predicting field emergence with combinations of 30 and 18°C tests (difference between 30 and 18°C) was better than other tests alone. No significant relation was found between field emergence percentages and 15 and 13°C germination percentages.
Monte Carlo simulations of dynamic phase transitions in ultrathin Blume-Capel films
Yusuf Yuksel
Physics , 2013, DOI: 10.1016/j.physleta.2013.08.001
Abstract: Dynamic phase transition phenomena in ultrathin films described by Blume-Capel model have been investigated using Monte Carlo simulations. Hysteresis loops, micromagnetic structures, and hysteresis loop area curves, as well as dynamic correlation between the magnetization and the external field have been studied as functions of the field, as well as the film parameters. The variation of critical coupling of the modified film surface at which the transition temperature becomes independent of film thickness have been clarified for varying system parameters. Frequency dispersion of hysteresis loop area have been found to obey a power law for low and moderate frequencies for both ordinary and enhanced surfaces.
Critical behavior and universality properties of uniaxial ferromagnetic thin films in the presence of random magnetic fields
Yusuf Yuksel
Physics , 2014, DOI: 10.1016/j.jmmm.2015.03.005
Abstract: Critical phenomena in uniaxial ferromagnetic thin films in the presence of random magnetic fields have been studied within the framework of effective field theory. When the type of the random field distribution is bimodal, the system exhibits tricritical behavior. Furthermore, the critical value of surface to bulk ratio of exchange interactions at which the transition temperature becomes independent of film thickness is insensitive to the presence of disorder whether the distribution is bimodal or trimodal. Regarding the universality properties, neither $p$, nor $h$ variations in the system can affect the value of the shift exponent $\lambda$. In this regard, it can be concluded that pure ferromagnetic thin films are in the same universality class with those under the influence of random discrete magnetic fields.
Nonparametric stability methods for interpreting genotype by environment interaction of bread wheat genotypes (Triticum aestivum L.)
Akcura, Mevlut;Kaya, Yuksel;
Genetics and Molecular Biology , 2008, DOI: 10.1590/S1415-47572008005000004
Abstract: evaluation of performance stability and high yield is essential for yield trials conducted in different environments. we determined the stability of 10 bread wheat (triticum aestivum l.) genotypes (5 cultivars and 5 advanced lines) using nonparametric stability measures and compared nonparametric stability statistics across 19 environments in the central anatolian region of turkey. experiments were setup in a randomized complete block design with four replications. nonparametric stability measures revealed that al-2, karahan-99 and altay-2000 were the most stable and well adapted genotypes across the 19 environments. in addition, it was concluded that graphs of mean grain yield (t ha-1) vs. nonparametric measures (si(1), si(2), s(3), si(6) and σgy) values and kr vs. σr values could enhance visual efficiency of genotype selection based on genotype by environment interaction. furthermore, high top values, si(3) and si(6) were associated with high grain yield, but the other nonparametric stability measures were not positively correlated with grain yield and instead characterized a static concept of stability. choice of genotype for increased grain yield in bread wheat would, therefore, be expected to change yield stability by increasing the values of the si(3), si(6) and top nonparametric stability statistics.
Economic analysis of organic greenhouse lettuce production in Turkey
Engindeniz, Sait;Tuzel, Yuksel;
Scientia Agricola , 2006, DOI: 10.1590/S0103-90162006000300012
Abstract: health issues and environmental concerns have drawn the attention to organic agriculture aiming to protect the natural balance and to produce without damaging the environment. this study aims determining economic feasibility of organic greenhouse lettuce (lactuca sativa l.) in an on farm trial, to foster organic greenhouse vegetable production in the preservation area of tahtali dam, projected as the sole water resource of izmir, turkey's third largest. a 384 m2 greenhouse, constructed of galvanized metal tubing anchored and covered with a polyethylene was analyzed to identify typical operation procedures, and to determine unitary construction and operation cost. organic lettuces were produced during autumn season of 2001-2002, testing different organic fertilizer applications, including two rates of farmyard and poultry manure (30 and 50 t ha-1) with and without two organic fertilizers based on either bacteria or algae. economical analysis was performed according to different organic fertilizer applications. cost, yield, and price data were analyzed to determine the profitability of a typical operation. net return obtained from organic lettuce growing ranged between us $ 0.376 and us $ 0.901 m-2, as a result of different fertilizer applications.
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