Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Can, Erkan(4)
- Ural, Mesut(4)
- Aksu, Onder(3)
- Benzer, Fulya(3)
- Kocabas, Mehmet(3)
- Yaman, Mehmet(3)
- Yildirim, Numan(3)
- Yildirim, Nuran Cikcikoglu(3)
- Ölçülü, Abdullatif(3)
- Alatas, Bilal(2)
- Benzer, E.(2)
- Celayir, Yasin(2)
- Danabas, Durali(2)
- Demir, Veysel(2)
- Engin, Kenan(2)
- Erisir, Mine(2)
- Gürsoy, Halil(2)
- Kandemir, F. M.(2)
- Karabacak, Volkan(2)
- Karatay, Gulnaz(2)
- Kaya, Gokce(2)
- Kayim, Murathan(2)
- Kehayias, George(2)
- Kutluyer, Filiz(2)
- Menteşe, Sabit(2)
- Ozkaraca, M.(2)
- Polat, Ali(2)
- Sançar, Taylan(2)
- Satış, İhsan(2)
- Tanyol, Mehtap(2)
- Tatar, Orhan(2)
- Tosun, İbrahim(2)
- Turkoglu, Semra(2)
- Yabanli, Murat(2)
- Yildiz, Nurettin(2)
- Yilmaz, Hatice Asuman(2)
- Yüce, Songul(2)
- Yüksel, Fahrettin(2)
- Yüksel, Fahrettın(2)
- Akar, Yeliz(1)
Yayınlar
- MakaleAçık Erişim2012Scopus SJRQ3Potential of Cottonseed Oil as Fish Oil Replacer in European Sea Bass Feed Formulation
Eroldogan, Tufan; Turchini, Giovanni M.; Yilmaz, Asuman H.; Tasbozan, Oguz; Engin, Kenan; Ölçülü, Abdullatif; Özsahinoglu, Ilgin; Mumogullarinda, Pinar
AtıfOpenAlex28
İncele - MakaleYalnız künye2012Scopus SJRQ2Cyano-complexes and salts with tetracyanonickellateII and N,N-bis(2-hydroxyethyl)-ethylenediamine: synthesis, IR spectra, magnetic properties, thermal analyses, and crystal structures
Karadag, A.; Korkmaz, S. Aslan; Andaç, O.; Yerli, Y.; Topcu, Y.
Four cyano complexes, [Ni(N-bishydeten)Ni(CN)(4)](n) (c1), [Cu(N-bishydeten)(2)][Ni(CN)(4)] (c2), [Zn-2(N-bishydeten)(2)Ni(CN)(4)](n) (c3), and [Cd(N-bishydeten)(2)][Ni(CN)(4)] (c4), have been synthesized and characterized by FT-IR, elemental, and thermal analyses. The structures of c2 and c4 were determined by single-crystal X-ray diffraction studies; both structures contain isolated cations and anions. The c2 consists of [Cu(N-bishydeten)(2)](2+) with octahedrally coordinated Cu-II and diamagnetic [Ni(CN)(4)](2-), but c4 consists of [Cd(N-bishydeten)(2)](2+), in which Cd-II is eight coordinate with two tetradentate N-bishydeten and diamagnetic [Ni(CN)(4)](2-). The value of the shape measure S (degrees) indicates that the coordination geometry around Cd-II lies along D-2d [dodecahedron; (dd)], C-2v [bicapped trigonal prism; (btp)], and D-4d [square antiprism; (sap)] but close to D-2d and D-4d. Variable temperature magnetic susceptibility measurements of c1 and c2 show the presence of little antiferromagnetic interaction below 20 K. Thermal analyses reveal that first neutral N-bishydeten and then cyano ligands were liberated from the complexes.
AtıfWoS19OpenAlex16İncele - MakaleYalnız künye2012Scopus SJRQ2INVESTIGATION OF COPPER CEMENTATION KINETICS BY ROTATING ALUMINUM DISC FROM THE LEACH SOLUTIONS CONTAINING COPPER IONS
Ekmekyapar, Ahmet; Tanaydin, Mehmet; Demirkiran, Nizamettin
Recovery of metallic copper from the leach solution containing copper (II) ions by cementation process using aluminum disc has been examined. Solutions obtained from the leaching of malachite in aqueous acetic acid solutions were used in the study. It was determined that the cementation rate increased with increasing solution concentration, temperature and rotating speed, and decreasing solution pH. The reaction rate fits to the first order pseudo homogeneous reaction model and is controlled by diffusion. The activation energy of this process was calculated to be 32.6 kJ/mol.
AtıfWoS27İncele - MakaleYalnız künye2012Scopus SJRQ4Use of Atomic Absorption Spectrometry in Assessment of Biomonitor Plants for Lead, Cadmium and Copper Pollution
Kaya, Gokce; Yaman, Mehmet
Eleven plant species were collected from the vicinity of lead-battery plant in the city of Gaziantep, Turkey. Lead, cadmium and copper concentrations in the soil and leaves of plants were determined by atomic absorption spectrometry. Lead, Cd and Cu concentrations in the soil samples taken from battery area were found to be in the ranges of 304 similar to 602, 0. 4 similar to 0. 44 and 31 similar to 37 mg . kg(-1), respectively. Significantly increased lead concentration up to 2 750 mg . kg(-1) was found in the leaves of Eleagnus angustifolia L. plant. The lead concentrations in the other plant leaves taken from 50 m around battery factory followed the order Ailanthus altissima > Morus sp. > Juglans regia L. > Ficus carica L. > Cydonia oblonga Miller > Prunus x domestica L. The plants, Populus nigra L., Eleagnus angustifolia L. and Salix sp. were found useful for Cd, and the plant, Eleagnus angustifolia L. for Pb, to be considered as potential biomonitor. Especially, leaves of trees and plants taken from the distance of 50 m from battery plant have relatively higher Pb concentrations. Therefore, people who and animals which live in this area and benefit from these soil and plants have vital risks.
AtıfWoS12
İncele - MakaleYalnız künye2012Scopus SJRQ3HATCHING PERFORMANCES AND YOLK SAC ABSORPTIONS OF CASPIAN BROWN TROUT (SALMO TRUTTA CASPIUS T., 1954)
Kocabas, M.; Basçinar, N.; Sahin, S. A.; Kutluyer, F.
Salmo trutta caspius T., 1954 is a native to Caspian Sea and is an important fish species due to its aquaculture potential, economic value and high marketability. The aims of this study were to determine hatching rate, body and yolk weight at hatching, the growth rate during the yolk absorption and yolk conversion efficiency of S. I. caspius larvae. Studies were further extended to determine the relationships between length, total wet weight, dry yolk body weights of alevins and degree-days. Results revealed that the mean wet weight was 16.78 +/- 2.17 mg (n = 10) at hatching and reached 52.62 +/- 3.55 mg just before the swim-up stage. The mean dry weights of the body and yolk sac were 2.36 +/- 0.28 mg and 10.67 +/- 0.67 mg at hatching and 7.21 +/- 0.71 mg and 2.57 +/- 0.62 mg at swim-up stages, respectively. The mean body dry matter and water content of the larvae were 33.10% and 66.90% at hatching and 15.46% and 84.54% of the total biomass at swim-up stages, respectively. Our results indicated that dry yolk, total larval weights and dry matter of the larvae decreased, while body weight and water content increased with degree-days. The growth of larva, yolk sac absorption and yolk conversion efficiency were calculated as 0.18 mg/day, 0.23 mg/day and 0.60, respectively. The data collected during these studies contribute to the management practices of the stocks of this species.
AtıfWoS2İncele - MakaleYalnız künye2012Scopus SJRQ4High Performance Liquid Chromatography-Mass Spectrometry for Determination of Benzo[a]pyrene in Grilled Meat Foods
Ince, Muharrem; Yaman, Mehmet
The concentrations and varieties of benzo[a]pyrene were determined in Turkish foodstuffs including grilled meat and chicken samples by high performance liquid chromatography-mass spectrometry (HPLC-MS). The parameters that are thought to affect the response in the HPLC-MS analysis were optimized. The optimized conditions were found to be 0.75 mL min(-1) for flow rate of mobile phase, 45 mu L for injection volume, 55 degrees C for column temperature and 140 V for fragmentor potential. The optimized method was applied for the determination of benzo[a]pyrene concentrations in grilled meat and chicken foods. The obtained concentrations were found in the range of 2.7-8.3 mu g kg(-1) for the normal grilled meat and chicken samples and 72-138 mu g kg(-1) for over-grilled samples. The results showed that the concentrations of benzo[a]pyrene were significantly dependent on the kind of meat and the cooking time and source. The limits of detection and quantitation were found to be 0.7 and 2.33 mu g L-1, respectively.
AtıfWoS1İncele - MakaleAçık Erişim2012Scopus SJRQ2Chemotherapeutic Agent-induced Nephrotoxicity in Rabbits: Protective Role of Grape Seed Extract
Benzer, Fulya; Kandemir, Fatih Mehmet; Ceribasi, Songul; Ozkaraca, Mustafa; Yildirim, Nuran Cikcikoglu; Ozan, Sema Temizer
Cisplatin (CP) is one of the most effective cancer chemotherapeutic agent used against various solid tumors. This study was designed to investigate the antioxidant effects of Grape Seed Extract (GSE) on CP induced oxidative damage in rabbit kidney. The material of study was consist of 18 male New Zealand rabbit. Animals were divided into 3 groups. The first group was administered a single intraperitoneal (i.p.) close of 0.9% saline. The second group of rabbits was treated with CP (a single i.p. dose of 5 mg kg(-1) body weight); The third group of rabbits was treated with GSE by gavage at the dose of 250 mg kg(-1) body weight for 6 consecutive days before and 6 consecutive days after a single i.p. CP injection. As a result of CP administration, kidney function tests; urea, BUN (Blood Urea Nitrogen) and creatinine levels were increased (p<0.001). It was observed that CP increase malondialdehide (MDA) levels, the most important indicator of oxidative damage and decreased the activity of catalasc (CAT). Administration of CP did not caused statically a change in glutathione (GSH) levels and glutathione peroxidase (GSH-P-x) activity (p>0.05). GSE treatment has high levels of MDA to compared to normal levels (p<0.001) but not an increase in CAT (p<0.05). In CP treatment group, severe acute tubular necrosis was seen. It was determined that in CP+GSE group mild degenerative changes were received instead of acute tubular necrosis. GSE has been found to be partially protective effect against CP induced biochemical and histopathological changes in rabbit kidney.
AtıfWoS7OpenAlex7İncele - MakaleYalnız künye2012Scopus SJRQ3COMPARISON OF HEAVY METALS BIOACCUMULATION BY DREISSENA POLYMORPHA (PALLAS, 1771) AND UNIO ELONGATULUS EUCIRRUS (BOURGUIGNAT, 1860) FROM KEBAN DAM LAKE, TURKEY
Aksu, Onder; Yabanli, Murat; Can, Erkan; Kutluyer, Filiz; Kehayias, George; Can, Safak Seyhaneyildiz; Kocabas, Mehmet; Demir, Veysel
The present study aimed to determine and compare the bioaccumulation of heavy metals in two freshwater species of mussels Unio elongatulus eucirrus (Bourguignat, 1860) and Dreissena polymorpha (Pallas, 1771) in Keban Dam Lake, Turkey. The amount of Arsenic (As), Cadmium (Cd), Copper (Cu), Lead (Pb) and Uranium (U) were detected. Heavy metals concentrations (ppm) of these heavy metals in U. e. eucirrus and D. polymorpha were 1.071 and 1.376 for As, 0.174 and 0.335 for Cd, 0.004 and 3.817 for Cu, 0 and 0.267 for Pb, 0.004 and 0.267 for U, respectively. Arsenic concentrations in the tissues of both species have exceeded the maximum permission limits in all sampling sites. The concentrations of Cu and U were considerably greater in D. polymorpha specimens than in U. e. eucirrus (p<0.05). The results obtained from the present study showed that both species accumulated heavy metals generally in the following sequences: Cu > As > Cd > Pb >U. The present results indicated that D. polymorpha may be a better bioindicator of environmental pollution than U. e. eucirrus, since it showed a higher accumulation capacity.
AtıfWoS17İncele - MakaleAçık Erişim2012Scopus SJRQ3The Effects of Different Dosage of Kefir with Different Durations on Growth Performances and Antioxidant System in the Blood and Liver Tissues of Coruh Trout (Salmo coruhensis)
Can, Erkan; Kurtoglu, Ilker Zeki; Benzer, Fulya; Erisir, Mine; Kocabas, Mehmet; Kizak, Volkan; Kayim, Murathan; Çelik, Huseyin Tugrul
The objective of the present work is to examine the effects of different doses (0, 10, 20 and 40 g kg(-1) fish diet mass) of kefir on growth performance and oxidant-antioxidant status in the blood and liver tissues of Coruh trout, Salmo coruhensis, in different periods (2 and 3 months). In this study, survival was more than 88.3%, and irrespective of dietary kefir levels at the end of the study. There were no significant differences in SGR (Specific growth rate), FCR (Feed conservation rate), CF (Condition factor) among fish fed diets with 0, 10, 20 and 40 g kg(-1) kefir, however, these growth values were significantly different in terms of durations between 2-month and 3-month treatment (P<0.05). Our results indicated that TAS (Total Antioxidant Status) and TOS (Total Oxidant Status) in blood tissues reduced with kefir treatment at the end of third month (P<0.05). Malondialdehyde (MDA) levels in liver decreased in all groups compared with control group and a considerable extent decrease was observed in 40 g dose of kefir treatment at the end of third month. The data obtained from this experiment indicated that the same dose of kefir was more effective at the end of 3-month treatment than 2-month treatment (P<0.001). Although there was no statistical difference among groups, an increase in the glutathione peroxidase (GSH-Px) enzyme activity was observed in all groups compared to control groups. While catalase (CAT) activity decreased in all groups compared to control group at the end of second month (P<0.01), the decrease was insignificant level at the end of third month. In glutathione (GSH) levels, statistical differences were no observed in all groups compared to the control group with 2-month treatment while there were significant increases with 3-month treatment (P<0.001). It was concluded that kefir could play an antioxidant role and its effectiveness depended on dosage and time of application in Coruh trout, S. coruhensis.
AtıfWoS15OpenAlex15İncele - MakaleAçık Erişim2012Scopus SJRQ3Effect of the cBN Content and Sintering Temperature on the Transverse Rupture Strength and Hardness of cBN/Diamond Cutting Tools
Kir, Durmus; Islak, Serkan; Çelik, Halis; Çelik, Ertugrul
The aim of this work was to investigate the effect of cBN content and sintering temperature on the transverse rupture strength (TRS) of cBN/diamond cutting tools produced by hot pressing. The segments containing different cBN content were manufactured under 35 MPa pressure at 600, 650 and 700 degrees C with a 3 minutes sintering time. The TRS of segments were determined using three-point bending test. Microstructure and phase composition of fracture surface of segments were determined by scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. The obtained results show that the TRS of the segments with cBN were higher than that of the segments with diamond.
AtıfWoS20OpenAlex16İncele - MakaleAçık Erişim2012Scopus SJRQ2Changes in nitric oxide levels and erythrocyte arginase activities in patient with Down syndrome
Ozbey, Ulku; Seyran, Ayse; Erisir, Mine; Benzer, Fulya; Savucu, Yuksel
Down syndrome is a chromosome abnormality with specific clinical symptoms and mental retardation caused by trisomy of chromosome 21. There is evidence that oxygen free radicals play an important role in the pathophysiology of many neuropsychiatric disorders. Although, it has not been investigated yet, several recent studies proposed that nitric oxide related to oxidative stress and arginase may have a pathophysiological role in mental retardation. The purpose of this study was to determine plasma nitric oxide levels and erythrocyte arginase activities in patients with Down syndrome and in healthy children. Plasma nitric oxide levels and erythrocyte arginase activity were measured in 20 patients with Down syndrome (median age: 15.6 +/- 7.5) and 20 age-matched healthy subjects (median age: 16.2 +/- 7.4). Significant differences were found between erythrocyte arginase activity of the patients with Down syndrome (35.2 +/- 2.7 U/g hemoglobin (Hb)) and those of healthy children (43.5 +/- 2.9 U/g Hb), (P < 0.05). But we have not found any statistical difference between persons with Down syndrome and control group for nitric oxide (P > 0.05). It was concluded that the level of erythrocyte arginase activity could be considered as a useful marker for assessing the level of mental retardation in children with Down syndrome.
- MakaleAçık Erişim2012Scopus SJRQ3Some Biological Characteristics of Luciobarbus esocinus Heckel, 1843 Living in Keban Reservoir
Çoban, Mehmet Zulfu; Türkgülü, Ibrahim; Yüksel, Fahrettin; Celayir, Yasin; Yüce, Songul; Eroglu, Mucahit; Yildiz, Nurettin; Sen, Dursun
This study was carried out in Luciobarbus esocinus obtained from Keban Reservoir (Elazig) between March 2008 and October 2009. During the research, it was determined that the percentage of male, female and undefined individuals from 187 L. esocinus were 45.46%, 37.43% and 17.11% respectively. The ages of population were distributed between I and XVII. The lengths of the individuals ranged from 23.0 to 112.4 cm and the weight of them ranged from 118 to 18,042 g. The length and weight equation for population was determined as W-all individuals = 0.0057*TL3.2187 (n= 187, r= 0.98). The highest GSI values of both sexed were obtained in March and these values were decreased rapidly after this month. It was determined that the condition factor increased until age 5 and then, it decreased respectively.
AtıfWoS5OpenAlex5İncele - MakaleAçık Erişim2012Scopus SJRQ2Investigation of Yersinia ruckeri Infection in Rainbow Trout (Oncorhynchus mykiss Walbaum 1792) Farms by Polymerase Chain Reaction (PCR) and Bacteriological Culture
Seker, Engin; Karahan, Murat; Ispir, Unal; Çetinkaya, Burhan; Saglam, Naim; Sarieyyüpoglu, Mustafa
This study has been carried out to investigate the presence of Yersinia ruckeri, the causative agent of Enteric Red Mouth (ERM) disease, in rainbow trout fish breeding farms located in Elazig and Malatya provinces in Eastern Turkey. For this purpose, bacteriological culture and a specific polymerase chain reaction (PCR) have been compare with examine blood and intestine samples collected from adult and young rainbow trout fish as well as water samples collected from all the farms. Y. ruckeri was isolated and identified from eight of the 17 fish farms giving a proportion of 52.9% at fish farm. The disease was noted in five of the rainbow trout farms located in Elazig and three of the 11 rainbow trout farms located in Malatya. The agent was detected in five of the six young fish breeding farms. The isolation percentages of the causative agent at fish level were calculated as 25.7% (131/510) in adult and 31.7% (19/60) in young fish, giving an overall proportion of 26.3% (150/570). All the isolates have been successfully identified as Y ruckeri by species-specific PCR. No isolation could be made from water samples. It is therefore concluded that Y. ruckeri infection poses a significant threat to the fish farms in the study area and necessary precautions should urgently be taken in order to minimize economical losses due to ERM disease. A specific PCR can be utilized successfully in aquaculture for rapid identification of bacterial agents which will help to prevent spread of infectious diseases and will therefore contribute to the productivity of fishery sector.
AtıfWoS6OpenAlex7İncele - MakaleYalnız künye2012Scopus SJRQ3Beneficial effects of oral administrations of grape seed extract on healing of surgically induced skin wounds in rabbits
Sagliyan, A.; Benzer, E.; Kandemir, F. M.; Gunay, C.; Han, M. C.; Ozkaraca, M.
This study examined the effects of orally given grape seed extract (GSE) on healing of surgically induced full thickness skin wounds in terms of clinical, histopathological and biochemical aspects. A total of 48 healthy. adult male New Zealand rabbits were randomly divided in 2 equal experimental and control groups: one week prior the surgery, 260 mg/kg grape seed extract was orally given for 20 days to the assay animals. A circular full thickness skin wound (2.5 cm in diameter) was made in the back midline of all rabbits under anaesthesia then, macroscopic and histopathological aspects as well as the tissue oxidant/antioxidant balance were determined on 6 rabbits from each group slaughtered at the 5th, 10th, 15th and 20th days post-surgery. In treated rabbits, it was clinically observed that the wound contraction was significantly amplified and the histological processes of re-epithelisation, granulation tissue development, collagen accumulation and angiogenesis were markedly hastened whereas the inflammatory reaction and the ulcer disappeared more rapidly than in the not-treated controls. Furthermore, the maximal skin MDA formation observed on the 10th day was significantly depressed and the antioxidant catalase (CAT) and glutathione peroxidase (GSH-Px) activities remained significantly elevated until the 15th day compared to the controls. These results demonstrate the beneficial effects of treatment with GSE on skin wound healing in rabbits.
AtıfWoS4İncele - MakaleYalnız künye2012Scopus SJRQ4Determination of Antioxidant Capacities of Phlomis pungens Wild. var. hispida Hub.-Mor.
Keser, Serhat; Turkoglu, Semra; Celik, Sait; Turkoglu, Ismail
The genus Phlomis L. belongs to the Lamiaceae family and encompasses 100 species native to Turkey, North Africa, Europe and Asia. It is a popular herbal tea enjoyed for its taste and aroma. Phlomis species are used to treat various conditions such as diabetes, gastric ulcer, hemorrhoids, inflammation and wounds. In this study, ethanol and water extracts were prepared from powdered P pungens flowers and leaves. Antioxidant activities were measured by 2,2-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS(center dot+)) radical scavenging, 1,1-diphenyl-2-picryl-hydrazyl free radical (DPPH center dot) scavenging, superoxide anion (02) radical scavenging, reducing activity and ferrous metal chelating activity assays. In conclusion, P. pungens flowers and leaves had effective ABTS(center dot+) and DPPH center dot radical scavenging, superoxide anion radical scavenging, reducing power and metal chelating activities when compared with BHA, BHT and alpha-tocopherol as reference antioxidants.
AtıfWoS13İncele - BildiriYalnız künye2012The Solutions of Partial Differential Equations with Variable Coefficient by Sumudu Transform Method
Bulut, Hasan; Baskonus, H. Mehmet; Tuluce, Seyma; Sivasundaram, S
In this paper, we studied to obtain numerical solutions of partial differential equations with variable coefficient by Sumudu Transform Method (STM). We applied to three examples this method. Then, we ploted 2D and 3D graphics of these equations by means of programming language Mathematica. In order to solve these differential equations which is ordinary and partial, the integral transforms such as the Laplace, Hankel and Fourier were unusually used and therefore there are several works on literature and applications of them. But it has few been given by using STM. And thus, in recent years STM has been an important places in applied sciences such as especially engineering, physics, physical sciences. Moreover, it is important for solving ordinary and partial differential equations which is linear and nonlinear.
AtıfWoS16OpenAlex16İncele - BildiriYalnız künye2012Scopus SJRQ2The investigation on physico-chemical parameters of the textile effluents after treatment by white rot fungus Pleurotus djamor
Yildirim, Numan; Tanyol, Mehtap; Dere, Turgay; Cumurcu, Aysenur; Yildiz, Abdunnasir
AtıfWoS3OpenAlex4İncele - MakaleYalnız künye2012Scopus SJRQ2A COMPUTER SIMULATION MODEL TO REDUCE PATIENT LENGTH OF STAY AND TO IMPROVE RESOURCE UTILIZATION RATE IN AN EMERGENCY DEPARTMENT SERVICE SYSTEM
Gul, Muhammet; Guneri, Ali Fuat
This paper presents a case study of a discrete-event simulation (DES) model of an emergency department (ED) unit in a regional university hospital in Turkey. In this paper emergency department operations of the hospital were modeled, analyzed and improved. The goal of the study is to reduce patient average length of stay (LOS) and to improve patient throughput and utilization of locations and human resources (doctors, nurses, receptionists). Some alternative scenarios in an attempt to determine optimal staff level were evaluated. These alternative approaches illustrate that vital improvement in LOS and throughput can be obtained by minor changes in shift hours and number of resources. Considering future changes in patient demand a scenario which reduces LOS and improves throughput is available in the paper. Significance: The Key Performance Indicators (KPIs) to determine and improve system performance in healthcare emergency departments consist of to reduce patient average length of stay (LOS), to improve patient throughput and resource utilization rates. Alternative scenarios and optimal staff levels are enhanced within the scope of this study.
AtıfWoS53İncele - MakaleAçık Erişim2012Scopus SJRQ3The essential oils of the aerial parts of two Hypericum taxa (Hypericum triquetrifolium and Hypericum aviculariifolium subsp depilatum var. depilatum (Clusiaceae)) from Turkey
Yuce, Ebru; Bagci, Eyup
In this study, essential oil compositions of two Hypericum L. taxa (Hypericum triquetrifolium Turra. and Hypericum aviculariifolium Jaub. et Spach subsp. depilatum var. depilatum (Freyn et Bornm.) Robson) naturally grown in Turkey were determined using gas chromatography and gas chromatography-mass spectrometry systems. The essential oils were obtained by hydrodistillation from the aerial parts of plants. A total of 45 compounds were identified in the essential oils of H. triquetrifolium; 1-hexanal (18.8%), 3-methylnonane (12.5%) and alpha-pinene (12.3%). In this study, 41 components were identified in H. aviculariifolium subsp. depilatum var. depilatum oil; alpha-pinene (52.1%), germacrene D (8.5%) and beta-pinene (3.6%) were the predominant constituents. The essential oil analysis showed that monoterpene concentrations were higher than that of the sesquiterpenes in both oils. The results were discussed in the meaning of the usefulness of these plants and their chemicals as natural products and potential usage in chemotaxonomy.
AtıfWoS12OpenAlex17İncele - MakaleAçık Erişim2012Scopus SJRQ1Automatic classification of power quality events and disturbances using wavelet transform and support vector machines
Eristi, H.; Demir, Y.
In this study, a new approach for the classification of power quality events is presented. Also, power quality disturbances, which occur in each phase of the power system after a fault event, are classified with the proposed system. In the proposed recognition system, three-phase voltage signals are used in order to identify the type of power quality events. Three-phase voltage signals are subjected to normalisation and segmentation processes. A wavelet transform method is used in order to obtain the distinctive features of event signals. An efficient feature vector, which represents the distinctive characteristics of three-phase event voltage signals and reduces data size, is extracted by applying the two-stage feature extraction process. Power quality event types are determined by using a support vector machine classifier. At the last stage of intelligent recognition system, types of power quality disturbances regarding each fault event are identified by doing a further analysis. Real power system data are used to evaluate the performance of the proposed approach. According to the obtained results, proposed intelligent recognition system classifies power quality event types with a high accuracy. The analyses and results also show that the proposed approach is efficient, reliable and applicable.
AtıfWoS68OpenAlex101İncele