Yayınlar
Koleksiyondaki öğeler
- MakaleAçık Erişim2012Scopus SJRQ2Results after multivisceral resections of locally advanced colorectal cancers: An analysis on clinical and pathological t4 tumors
Gezen, Cem; Kement, Metin; Altuntas, Yunus E.; Okkabaz, Nuri; Seker, Mesut; Vural, Selahattin; Gumus, Mahmut; Oncel, Mustafa
Background: Locally advanced colorectal cancers are best treated with multivisceral resections. The aim of this study is to evaluate early and late results after multivisceral resections.Methods: All patients operated for primary colorectal cancer between 2001 and 2010 were -reviewed. These were compared within the patients underwent single organ and multivisceral resections: demographics, tumor and procedure related parameters, perioperative results, early oncological outcomes and 5-year survival.Results: A total of 354 patients (59.6 ± 13.8 years old, 210 [59.3%] males) were abstracted. Ninety (25.4%) patients underwent multivisceral resections for clinical T4 tumors and en-bloc R0 resection was achieved in 82 (91.1%). Only 31 (34.4% and 8.8% of clinical T4 and all cancers, respectively) cases had actual adjacent organ invasions (pT4). Males (20%) had lower risk for locally advanced tumors than females (33.3%) (p < 0.05). PT4 cancers were more common, if the clinical T4 tumor is located in the colon (48.8% vs 21.3%; p < 0.01). Laparoscopy was seldom initiated and the risk of conversion was higher in clinical T4 tumors (p < 0.05). The rates of sphincter-saving procedures were not different. Operation time, bleeding and transfusion requirements increased when multivisceral resections were necessitated (p < 0.05), but hospital stay, complications and 30-day mortality rates were similar. The 5-year survival rates were identical (p > 0.05).Conclusions: Clinical T4 tumors are not rare and more common in women. An actual invasion (pT4) may be observed in one third of all clinical T4 tumors, and more frequent in colon cancers. An en-bloc, R0, multivisceral resection may be achieved in most cases. Multivisceral resections do not alter the rates of sphincter-saving procedures, morbidity and 30-day mortality; do not worsen survival but increase operation time, intraoperative bleeding and perioperative transfusion requirements.
AtıfScopus74WoS64OpenAlex85
İncele - BildiriYalnız künye2013Self-deploying composite shell reflector antenna for Ku-band missions: 1.5 m diameter demonstrator
Soykasap, Omer; Karakaya, Sukru; Kaplan, Erdar
Carbon fiber reinforced plastic (CFRP) composite shell reflectors have been developed for space borne antennas due to their light weight, high thermal stability, and high surface accuracy. In order to reduce launch cost and structural mass, compactly folding and self-deployment of the reflector is preferred. In this paper, the full-scale offset reflector with a diameter of 6 m was designed by introducing reinforcements in the central region. After modal analysis was carried out for full-scale reflector model, the suitability of design was determined and 1/4-scaled version was manufactured. The experiments of the demonstrator were conducted for modal analysis, folding, dynamic deployment behavior and surface accuracy. As a result of study, new reflector model was successfully designed with low-mass, manufacturing ease, lower cost and has a monolithic structure, which two opposite edges of the reflector can be rolled toward the center of the reflector for packaging.
AtıfScopus4WoS3İncele - MakaleYalnız künye2012Scopus SJRQ3A multistage variational iteration method for approximateanalytic solution of avian-human influenza epidemic model
Gökdoǧan, Ahmet; Merdan, Mehmet; Ertürk, Vedat Suat
In this paper, the approximate solution of avian-human influenza epidemic model is obtained by a reliable algorithm based on an adaptation of the standard variational iteration method (VIM), which is called the multi-stage variational iteration method (MVIM). A comparison between MVIM and the Runge-Kutta method (RK-method) reveals that the proposed technique is a promising tool to solve the considered problem.
AtıfScopus1WoS1İncele - MakaleYalnız künye2012Scopus SJRQ4Aggression and violence towards health care providers, and effects thereof
Eker, Hasan Hüseyin; Özder, Aclan; Tokaç, Mahmut; Topçu, Ibrahim; Tabu, Abdulkadir
Objectives. This study aims to examine the frequency of exposure of health care providers to aggression and violence at work, and the effective factors thereon, as well as the effects of violence on health care providers. Materials and Methods. This cross-sectional type study has been conducted in Istanbul Training and Research Hospital (IEAH) (219) and Bayrampasa State Hospital (BDH) (64) in April 2010. The questionnaire prepared by researchers has been filled in through face-to-face meetings with a total of 283 health care providers, who accepted to take part in the study. The resulting data have been assessed and evaluated through SPSS 11.5 package program. Results. 66.8% of the respondents reported that they had been exposed to violence and aggression during the recent one year, the most frequent type thereof being verbal violence (86.8%). 90.2% of the health care providers exposed to violence at work stated that the applicable current laws do not protect the staff against violence, and 88.3% thereof stated that their institution have not supported them upon an act of violence. A statistically significant difference in the frequency of exposure to violence has been detected between age, seniority at work, place of exposure to violence, and profession of the health care staff (p<0.05). Approximately half of the health care providers opine that their behavior towards patients has been negatively affected from violence. It is noted that such negative behavior change is even higher in females, staff with a frequency of violence > 5, assistants, and staff who believe that security at work is at risk in their institution (p<0.05). Conclusions. Around 1/3rd of the health care providers have reported that they have been exposed to violence at least once during the recent one year, and half of those exposed to violence have stated that their behavior towards patients has been negatively affected therefrom.
AtıfScopus25WoS23İncele - MakaleAçık Erişim2011Solutions for 4D cadastre - with a case study on utility networks
Döner, Fatih; Thompson, Rod; Stoter, Jantien; Lemmen, Christiaan; Ploeger, Hendrik; van Oosterom, Peter; Zlatanova, Sisi
The increasing complexity and flexibility of modern land use requires that cadastres need to manage information on the third and temporal (fourth) dimension. This article considers the registration of legal space of utility networks in cadastre in this 3D + time (=4D) context. A requirement analysis in three countries that have methods to register utility networks complying with their legal, organizational and technical structure (Turkey, the Netherlands and Queensland, Australia) is the basis for three alternatives for 4D cadastre to register utility networks. The three alternatives are analysed with respect to legal, organizational and technical cadastral requirements. This article presents a case study and a prototype from the Netherlands. In this country by law utilities are considered to be real estate objects with obligatory registration of ownership and geometry. This study shows that the 3D space and separate temporal attributes approach (state-based model) is a very promising solution to maintain temporal changes of utility networks and that this approach is to be preferred above the current practice, where the 3D and temporal aspects are not considered when registering a network.
AtıfScopus61WoS50OpenAlex78İncele - MakaleAçık Erişim2015Scopus SJRQ2An Experimental Study on Heat Transfer and Pressure Drop of CuO-Water Nanofluid
Sahin, Bayram; Manay, Eyuphan; Akyurek, Eda Feyza
Heat transfer and pressure drop characteristics of water based CuO nanofluid inside a horizontal tube were investigated experimentally. The upper limitation of the particle volume fraction with respect to heat transfer performance was also found. CuO-water nanofluids with volume fractions of 0.5%, 1%, 2%, and 4% were prepared by dispersing the CuO nanoparticles with an average diameter of 33 nm into deionised water. Experiments were carried out under the steady-state, constant heat flux, and turbulent flow regime conditions. The variations of the average Nusselt number and the friction factor with the Reynolds number were presented. For all given particle volume concentrations, heat transfer enhancements were calculated. It was concluded that the particle volume concentrations higher than 1% vol. were not appropriate with respect to the heat transfer performance of the CuO-water nanofluid. No heat transfer enhancement was observed at Re = 4.000. The highest heat transfer enhancement was achieved at Re = 16.000 and = 0.005.
AtıfScopus35WoS29OpenAlex35İncele - Kitap BölümüYalnız künye2015Religious social movements and economic welfare in modern Turkey
Köroğlu, Cemile Zehra; Köroğlu, Muhammet Ali
In all societies, there have been some movements that point out social, political, economic, ideological, or moral problems or aim at partial or complete change. This chapter discusses the new meanings attributed to the concept of social movements in the postmodern era. A theoretical framework is proposed to understand the nature of social movements since the 1960s and to demonstrate their differences from classical movements. Turkey provides a particularly rich context with high potential for social movements, both with secular and religious aspirations. Religious social movements have shown quite a tense relationship with the state throughout the history of the republic; yet, they have gained power and prosperity through evolving liberal economic policies since the 1980s. Therefore, resource mobilization and new social movement paradigms are used in this chapter to explain Turkey's religious social movements today.
- MakaleAçık Erişim2015Scopus SJRQ1Changes in sterol composition of hazelnut during fruit development
Ilyasoglu, Huri
Hazelnut is a valuable source of fat-soluble bioactive components. Among the fat-soluble bioactive components, phytosterols have gained much interest due to their cholesterol reducing properties. This study presents the evaluation of changes in the sterol composition of Turkish hazelnut cultivars (Tombul, Palaz, and Sivri) during fruit development. Three major sterols (β-sitosterol, campesterol, and Δ5-avenasterol), and five minor sterols (clerosterol, brassicasterol, stigmasterol, Δ7-stigmastenol, and Δ7-avenasterol) were detected in all hazelnut cultivars during all stages. The total sterol contents of Turkish hazelnut cultivars reached the maximum values at the early stage and a significant reduction in the total sterol content occurred at the harvest stage.
AtıfScopus6WoS6OpenAlex4İncele - MakaleYalnız künye2013Scopus SJRQ3Heavy metal analysis by moss species in the Black Sea region of Turkey
Koz, Bahadir; Cevik, Ugur; Bulut, Volkan Numan; Kaya, Selim; Gundogdu, Ali; Celik, Necati
The heavy metal analysis of mosses in the Black Sea region of Turkey was determined using atomic absorption spectrometry method. The procedure was also validated by analysis of standard reference material (IAEA-336 Lichen). A qualitative analysis showed that the samples contained chromium, manganese, cobalt, nickel, copper, zinc, and lead. While the mean concentration values of Cr, Mn, Co, Ni, Cu, Zn, and Pb in the moss samples collected from city centers are 60.6, 820, 12.2, 18.8, 293, 181 and 39.8 mg.kg-1, the mean concentration values in the moss samples collected from the city intervals are 43.8, 761, 11.0, 15.6, 242, 170 and 38.4 mg.kg-1, respectively. Since this study was a heavy metal analysis along the highway, evaluation of these elements with their potential hazards for ecology and human was briefly discussed. A strong relationship was observed between Pb concentration and the traffic density.
AtıfScopus2WoS2İncele - MakaleYalnız künye2015Scopus SJRQ2Biogeochemical characteristics of Rosa canina grown in hydrothermally contaminated soils of the Gümüşhane Province, Northeast Turkey
Vural, Alaaddin
Kırkpavli alteration area (Gümüşhane, Northeast Turkey) is contaminated by heavy metals such as Cd, Pb, As, Cu and Zn. The quantity of accumulation of heavy metal trace elements and macroelements in 32 leaves of Rosa canina of the Kırkpavli alteration area has been studied within the scope of geochemical studies. Element contents of samples were assessed using various parameters including descriptive statistics, factor analysis, correlation coefficients and bioaccumulation factor. Concentrations were detected in the acceptable range for Mo, Cu, Pb, Ni, As, Cd, Sb, P, Ti, Na, Se and Sn. Concentrations of Co, Mn, Ba and Hg were detected close to the acceptable values, whereas Zn, Fe, Sr, V, Ca, Cr, Mg, B, Al, K, W, Sc, Cs and Rb concentrations were detected above the acceptable values. Principal component analysis was used to identify the elements that have a close relationship with each other and/or similar origins. It has been concluded that Zn, Cu, As and Mo content of the plant were related to hydrothermal alteration process and they behaved together, whereas Mn and Fe were especially products of weathering conditions, also behaved together. In terms of macroelements, Ca, Mg and Na had similar behaviour, while P and K had the same correlation.
AtıfScopus16WoS16OpenAlex21İncele - MakaleYalnız künye2015Scopus SJRQ4Synthesis, antifungal activity and carbonic anhydrase inhibitory properties of Cu (II) Bis (3, 4 dimethoxybenzoate) bis (nicotinamide) dihydrate
Afsin Kaya, A.; Kaya, Elif Celenk; Sarikaya, S. Beyza Ozturk; Onaran, Abdurrahman
The new 3,4-dimethoxybenzoate complex of Cu(II) with nicotinamide was synthesized and characterized by elemental analysis, FT-IR spectroscopic study, UV-Vis spectrophotometry and mass spectrometry. The thermal behavior of the complex was studied by simultaneous TG, DTG and DTA methods in static air atmosphere. The infrared spectral characteristics of the complex is also discussed. In this complex, all ligands are coordinated to the metal ion as monodendate ligands. The final decomposition products were found to be the respective metal oxide. As it is well known, metal complexes of biologically important ligands are sometimes more effective than the free ligands. In this study the new compound was synthesized due to its functional groups such as veratric acid and nikotin amide, which have known biological characteristics and effective in terms of both enzyme and antifungal properties from recent studies. Therefore, antifulgal activity and enzyme inhibition properties of this complex have been examined.
AtıfScopus3OpenAlex3İncele - MakaleAçık Erişim2012Scopus SJRQ3On the solutions fractional Riccati differential equation with modified Riemann-Liouville derivative
Merdan, Mehmet
Fractional variational iteration method (FVIM) is performed to give an approximate analytical solution of nonlinear fractional Riccati differential equation. Fractional derivatives are described in the Riemann-Liouville derivative. A new application of fractional variational iteration method (FVIM) was extended to derive analytical solutions in the form of a series for these equations. The behavior of the solutions and the effects of different values of fractional order α are indicated graphically. The results obtained by the FVIM reveal that the method is very reliable, convenient, and effective method for nonlinear differential equations with modified Riemann-Liouville derivative
AtıfScopus46WoS31OpenAlex49İncele - MakaleYalnız künye2017Scopus SJRQ1Effectiveness of Black Mulberry Molasses in Prevention of Radiotherapy-Induced Oral Mucositis: A Randomized Controlled Study in Head and Neck Cancer Patients
Doǧan, Melike Demir; Can, Gulbeyaz; Meral, Rasim
Objectives: Radiation-induced oral mucositis is one of the problems experienced by 70%-80% of patients receiving radiation therapy (RT). This randomized controlled trial assessed the effectiveness of black mulberry molasses in the prevention of oral mucositis in head and neck cancer patients receiving RT. Interventions and Outcome measures: Eighty head and neck cancer patients scheduled to undergo RT to the oropharyngeal mucosa were randomly assigned to receive RT (42) or RT plus mulberry molasses (38). The research data were collected with a Patient Description Form, Common Terminology Criteria for Adverse Events, version 4.0, an Oral Assessment Guide, and the University of Washington Quality of Life Assessment Questionnaire. Results: The incidence and severity of oral mucositis were lower in the black mulberry molasses group. However, black mulberry molasses usage was an only independent and significant factor in prevention of mucositis [HR 0.63 (%95 GI 0.40-0.98)]. There were no differences between the quality of life scores of experimental and control groups. Conclusions: This randomized controlled study showed that black mulberry molasses usage is an effective intervention in the prevention of the radiation-induced mucositis of head and neck cancer patients. However, to confirm these results, further studies are needed.
AtıfScopus39WoS32OpenAlex40İncele - Kitap BölümüYalnız künye2016Marketing approach for non-profit organizations
Ayyildiz, Hasan; Akmermer, Bilgen; Akyüz, Ahmet Mutlu
All marketing definitions focus on the same point: customer orientation and the satisfaction of customer needs. Within this framework, although marketing approach in most of studies primarily deal with institutions and enterprises in profit/private sector, it has become crucial for all kind of organizations including non-profit ones. In recent years, many non-profits have grown larger and continue to improve their growth and effectiveness. In this sense, marketing is touchstone of developing non-profits. This part hopes to create a perspective to marketing definition to understand the relevance of marketing to non-profit organizations and how marketing strategies should be adapted to them for success.
AtıfScopus5OpenAlex5İncele - MakaleYalnız künye2017Scopus SJRQ2Solutions around a regular α singular point of a sequential conformable fractional differential equation
Unal, Emrah; Gokdogan, Ahmet; Celik, Ercan
In this work, firstly, some concepts of conformable fractional calculus in literature are given. Secondly, definitions of α-analytic point, α-ordinary point and regular α singular point are presented. Finally, the fractional power series solutions are given around a regular-singular point, in the case of variable coefficients for homogeneous sequential linear conformable fractional differential equations of order 2α.
AtıfScopus9WoS9İncele - Derleme MakaleAçık Erişim2019Scopus SJRQ1FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1
Abada, A.; Abbrescia, M.; AbdusSalam, S.S.; Abdyukhanov, I.; Fernandez, J. Abelleira; Abramov, A.; Aburaia, M.; Acar, A.O.; Adzic, P.R.; Agrawal, P.
We review the physics opportunities of the Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. We describe the measurement capabilities of each FCC component, addressing the study of electroweak, Higgs and strong interactions, the top quark and flavour, as well as phenomena beyond the Standard Model. We highlight the synergy and complementarity of the different colliders, which will contribute to a uniquely coherent and ambitious research programme, providing an unmatchable combination of precision and sensitivity to new physics.
AtıfScopus777OpenAlex659İncele - MakaleYalnız künye2018Scopus SJRQ2A New Nomogram Proposal to Determine Concrete Compressive Strength by Combined Nondestructive Testing Methods
Bingöl, Şinasi; Çavdar, Ahmet
Concrete is the most widely used construction material in contemporary construction technology. In particular, it holds an important place in the building industry in the world. Since concrete is a nonhomogeneous material, determining the strength of concrete accurately is quite difficult. In this respect, to check the mechanical properties of concrete in-situ, nondestructive test (NDT) methods can be used. They are useful as they do not damage concrete; however, these test results are sometimes deceptive. To reduce these deceptive results, destructive test methods were proposed to increase the accuracy of nondestructive methods. The objective of this study is to determine the strength of concrete with different characteristic strengths using destructive and NDT methods, and to establish new relationships between the compressive strength of concrete and Schmidt rebound values, and ultrasonic wave velocities. For this purpose, 101 concrete cube samples were prepared. After 7 and 28 days of curing, Schmidt rebound and ultrasonic wave velocity tests were applied as NDT methods. New formulations and graphs were established by carrying out a multiple regression analysis between the ultrasonic wave velocities, Schmidt rebound values, and compressive strengths. Thus, a new combined NDT method was developed with a nomogram. Furthermore, the applicability and accuracy of the formula and graph obtained were investigated by comparing the results of core samples from existing structures. The most important findings obtained from the study are summarized below. The concrete strength can be determined with nondestructive formulas obtained with an accuracy of 85%. High strength concrete cube samples are obtained in-house with 1.6% deviation, and core samples in-situ can be obtained with 7.3% deviation with the newly developed NDT nomogram. These test results show that the newly developed NDT formulas in this study are a very good alternative for determining concrete strength in-situ.
AtıfScopus13WoS9OpenAlex11İncele - MakaleAçık Erişim2016Scopus SJRQ2Comparison of flow behavior and physicochemical characteristics of low-cholesterol mayonnaises produced with cholesterol-reduced egg yolk
Yüceer, M.; Ilyasoǧlu, H.; Özçelik, B.
Egg yolk is common functional ingredient in food production, mainly in mayonnaise as an emulsifier. Egg yolk cholesterol was removed using β-cyclodextrine, treated with α-Amylase, and low-cholesterol mayonnaise produced. The flow behavior of cholesterol-reduced mayonnaise was investigated at different cholesterol-reduced egg yolk and xanthan gum content. The aim of this study was to evaluate the effects of different formulations at various percentages of egg yolk (EY; 4 and 6 percent by weight) and xanthan gum (XG; 0.5 and 0.7 percent by weight) on flow behavior and physicochemical properties of reduced-fat and low-cholesterol mayonnaise prepared with cholesterol-reduced liquid egg yolk and to obtain suitable model for mayonnaise formulations. The aim of the study was to develop a reduced-fat and lowcholesterol mayonnaise with properties similar to those of typical mayonnaise in the market. For this purpose, four reduced-fat and low-cholesterol mayonnaise formulations were prepared in the laboratory using cholesterol-reduced EY. They were compared with a commercial mayonnaise from a local market as a control sample. According to results, color parameters and flow behaviors of the samples compared with the control sample indicated that the samples had higher values of lightness and yellowness, and presented lower values of yield stress and flow behavior index and higher values of consistency coefficient with respect to the commercial product, except recipe that included 6% of EY and 0.7% of XG, which exhibited similar values to the typical commercial one in the market. The Herschel Bulkley model was employed in order to evaluate the effect of EY and XG ratios on mayonnaise rheological behavior. In general, the results obtained suggest that the recipe with EY (6 wt%) and XG (0.7 wt%) had better rheological characteristics and physicochemical properties those prepared with various formulations, maintaining the reduced-fat and low-cholesterol mayonnaise prepared with β-cyclodextrine-Treated cholesterol-reduced EY. It can be interpreted that the developed product may have potential use in industrial application.
AtıfScopus17WoS17OpenAlex20İncele - BildiriYalnız künye2018Behavior of T and X joints of elliptical hollow sections at both ambient and high temperatures
Ozyurt, E.; Wang, Y.C.
This paper presents the results of a numerical study to develop a method to calculate the ultimate load carrying capacity of welded Elliptical Hollow Section (EHS) joints at elevated temperatures. Extensive numerical simulations, using the non-linear finite element package ABAQUS v6.14-1, have been conducted on EHS T-and X-joints subjected to brace axial compression or tension, considering a wide range of geometrical parameters, pre-stress in chord member and different type of joint orientations. The FE simulation results indicates that the equivalent RHS method is not appropriate for calculating the load carrying capacity of EHS joints at ambient temperature. At elevated temperatures, for T-and X-joints with braces welded to wide sides of chord, replacing the ambient temperature yield strength of steel by the elevated temperature value overestimates the ultimate load carrying capacity of axially loaded EHS T-and X-joints with compressive brace. Alternative design methods have been proposed.
AtıfScopus1İncele - MakaleYalnız künye2015Scopus SJRQ3A note on weighted Sobolev algebras L1ω(ℝd) ∩ Wpk (ℝd)
Güngör, Nihan; Səgir, Birsen
Let 1 ≤ p < ∞ and ω be Beurling's weight function on ℝd. In this article, we demonstrate some harmonic properties of Sobolev space Wpk (ℝd) which consists of all functions on ℝd whose weak derivatives up to and including order k belong to Lp(ℝd). Also, we deal with some harmonic properties of intersection space Apk,ω(ℝd) = L1ω(ℝd) ∩ Wpk (ℝd) by aid of Beurling algebra L1ω(ℝd) and Sobolev space Wpk (ℝd). Finally, we research the inclusions and continuous embeddings between the spaces Apk,ω(Ω) where Ω ⊂ ℝd be open set.
