Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(47)
- Pat, Suat(29)
- Özen, Soner(29)
- Şenay, Volkan(24)
- Korkmaz, Şadan(23)
- Esmer, Yusuf(21)
- Şahin, Engin(21)
- Korkmaz, Özge(20)
- Cuce, Erdem(19)
- Öner, Erdal(18)
- Öztürk, Mesut(18)
- Artar, Musa(17)
- Yilmaz, Mustafa Tahsin(17)
- İspirli, Hümeyra(16)
- Ecem Bayram, Nesrin(15)
- Kaya, Yunus(15)
- Cinar, Mehmet(13)
- Cuce, Pinar Mert(12)
- Kamiloğlu, Aybike(12)
- Kutlu, Naciye(12)
- Mercan, Emin(12)
- Birinci, Ahmet(11)
- Bulut, Mehmet(11)
- Yaylacı, Murat(11)
- Bayram, Ozkan(10)
- Can, Zehra(10)
- Doğan, Zeki(10)
- Kahya, Cem(10)
- Karaali, Rabi(10)
- Pabuçcu, Hakan(10)
- Tosun, Figen Çam(10)
- Özdemir, Akın(10)
- Ayazoglu, Rabil(9)
- Battal, Fetullah(9)
- Bayram, Nesrin Ecem(9)
- Büte, Mustafa(9)
- Ertugrul, Mehmet(9)
- Kadakal, Mahir(9)
- Kaplan, Abdullah(9)
- Sarikaya, İsmail(9)
Yayınlar
- MakaleYalnız künye2012Yerel yönetimlerde sosyal bütçe; Erzurum Büyükşehir Belediyesi sosyal bütçesinin değerlendirilmesi
Kaya, Nurullah
Yerel yönetimler, bölge halkının ortak ihtiyaçlarını karşılamak üzere kurulmuş, topluma karşı sorumlulukları olan kamu kurumlarıdır. Bu sorumluluk çerçevesinde, yerel yönetimler, halkın hizmet taleplerine cevap verebilecek kaynakları bulmak ve bu kaynakları etkin kullanmak zorundadırlar. Bunun sonucunda, yerel yönetim politikaları, belde halkının ihtiyaçları doğrultusunda şekillenmektedir. Özellikle muhtaç sosyal gruplar dikkate alınarak yerel yönetim sosyal bütçelerinin hazırlanması ve bu bütçelerin hangi ihtiyaçlar için kullanıldığına ilişkin mali tabloların, ilgili birimlere sunulması gerekmektedir. Bu çalışmada; bütçe ve sosyal politikalarla ilgili teorik bilginin yanı sıra Erzurum Büyükşehir Belediyesinin birkaç yılı kapsayan sosyal bütçesi, yıllar itibarıyla ele alınmış ve sonuçları değerlendirilmiştir.
AtıfTR Dizin4
İncele - MakaleYalnız künye2012Mûsâ cârullah'ın eğitim üzerine düşünceleri: "tarîhu'l-kur'ân ve'l-mesâhıf" adlı eseri bağlamında
Şentürk, Mustafa
Genel olarak bireylere kendi iradeleriyle istenen davranışların kazandırılması şeklinde tanımlanan eğitim ile ekonomik ve siyâsî ilerleme veya gerileme kavramları arasında diyalektik bir ilişki söz konusudur. Başka bir deyişle eğitim, toplumların ilerlemelerinin ya da geri kalmalarının başlangıçta sebebi sonraları ise sonucudur. Bu yaklaşıma göre 18. yy.dan itibaren Osmanlı Devleti'nin şahsında İslâm medeniyetinin en önemli gerileme nedenlerinden biri olarak eğitim sisteminin bozulması, kalkınma yolundaki ilk çare olarak da eğitim sisteminin ıslahı gösterilmiştir. Küresel ölçekli çalkantıların cereyân ettiği ve İslâm medeniyetinin yenilgisini ilan ettiği bir dönemde yaşamış olan Mûsâ Cârullah böyle düşünen mütefekkirlerdendir. Cârullah'ın eğitim ile ilgili görüşlerini serdettiği eserlerinden biri de Târîhu'l-Kur'ân ve'l-Mesâhıf'tir. Makalemiz, Cârullah'ın adı geçen eserindeki eğitim üzerine görüşlerini incelemek amacını taşımaktadır
AtıfTR Dizin1İncele - MakaleYalnız künye2012Türkiye'de Birincil Enerji Kullanımı, Üretimi ve Gayri Safi Yurt İçi Hasıla (GSYİH) Arasındaki İlişki
Korkmaz, Özge; Develi, Abdülkadir
Ülkelerin sürdürülebilir bir ekonomik büyümeyi yakalayabilmeleri, öncelikle enerji kaynaklarının etkin bir şekilde kullanılmasına bağlıdır. Ancak enerji kaynaklarının dünya üzerinde eşit bir dağılım göstermemesi, Türkiye gibi yetersiz enerji kaynaklarına sahip olan ülkelerin enerjiye olan bağımlılığını arttırmaktadır. Dolayısıyla dışardan sağlanan enerji kaynaklarının iktisadi büyüme içerisindeki payının değerlendirilmesi büyük önem arz etmektedir. Bu çalışmada enerji tüketimi, enerji üretimi ile GSYİH arasındaki nedensellik ilişkisi Türkiye'nin 1960-2009 dönemi yıllık verileri kullanılarak incelenmektedir. Nedensellik sınamasında Johansen eşbütünleşme ve Granger nedensellik testleri kullanılmıştır. Johansen eşbütünleşme testi sonuçları ele alınan dönem için değişkenler arasında uzun dönemli bir ilişkinin varlığını göstermiştir. Ayrıca enerji tüketimi ile GSYİH arasında iki yönlü nedensellik tespit edilmiştir
AtıfTR Dizin35İncele - MakaleYalnız künye2012Enerji Dönüşümü Kavramının Farklı Öğrenim Seviyelerinde Öğrenilme Durumunun Araştırılması
Töman, Ufuk; Çimer, Sabiha Odabaşı
Bu araştırmanın amacı; ilköğretim, ortaöğretim ve üniversite seviyelerindeöğrenim gören öğrencilerin enerji dönüşümü kavramını anlama düzeylerini vemevcut kavram yanılgılarını belirlemektir.Bu araştırmada gelişimci araştırma yöntemi kullanılmıştır. Bu yöntemdahilinde veri toplama aracı olarak kavramsal anlama testi ve yarı yapılandırılmışmülakat kullanılmıştır. Çalışmada kullanılan testte yazılı cevap gerektiren sorularayer verilmiştir. Test ilköğretimden 35, ortaöğretimden 35 ve üniversiteden 25öğrenci olmak üzere 95 öğrenciye uygulanmıştır. Ayrıca, toplam 15 öğrenciylemülakatlar yapılmıştır.Test ve mülakatlardan elde edilen veriler enerji dönüşümü kavramıyla ilgilianlamaların farklı kategorilerde olduğunu ve bu kavramın her üç öğrenimseviyesindeki öğrenciler tarafından yeterince anlaşılamadığını göstermektedir.İlköğretim seviyesindeki öğrenciler enerji dönüşümü kavramını günlük hayattakikullanımı ile ilişkilendirirken, orta öğretim ve üniversite öğrencileri iseaçıklamalarında daha çok bilimsel tanım ve okul bilgisine bağlı kalmışlardır. Ayrıca,tüm öğrenim seviyelerinde bu kavramlarla ilgili kavram yanılgıları tespit edilmiştir.
AtıfTR Dizin4İncele - MakaleYalnız künye2012Study of bullyıng cırcumstances between 4TH and 5TH grade students of prımary educatıon accordıng to varıous varıables (rize provınce example)
Kansu, Ceren Çevık; Kartal, Ayça; Öksüz, Yücel
The purpose of this study is to examine the variables that could cause students to make bullying between primary education 4th and 5th grade students. The study sample consists of 294 primary school students randomly selected by sampling method ( 4-5th grade) attending primary schools located in 3 towns of Rize. This study is designed as a survey method. In the study, "Peer Bullying Survey" developed by the Pişkin (2002) has been used in order to determine the status of bully and victim. In addition, 10 students has been interviewed using 3 open-ended question developed by the researchers to be able to make further examination. Kay-square test and descriptive statistics has been used to analyze the data. The data obtained from interviews has been analyzed using the qualitative research techniques. According to findings,the vast majority of students has been implemented or exposed to bullying behaviors themselves. It has been found out that the most common type of bullying faced by the students is verbal bullying after the physical bullying, they were subjected to bullying by the bigger ones both inside and outside the school by "a male student" or "a group of male student", especially when they face with incidents of bullying, they ask for help from adults or reply to this circumstance and "physical and mental gymnastics" and "scientific awareness" category social clubs are mostly preferred by the students who make bullying
AtıfTR Dizin5İncele - BildiriYalnız künye2012Comparison and Analyzing Propagation Models
Tabakcioglu, Mehmet Baris; Ayberkin, Doruk; Cansiz, Ahmet
This paper presents a study on a class of algorithms based on Uniform Theory of Diffraction (UTD) for multiple diffractions. S-UTD-CH model can be used for fast and more accurate field prediction for multiple diffractions in transition zone. An extensive simulation results for comparison of UTD based algorithms with respect to the computation time and accuracy was provided.
AtıfWoS2
İncele - BildiriYalnız künye2012USAGE OF BAYBURT STONE IN ROAD INFRASTRUCTURES AS A IMPROVEMENT MATERIAL
Kamiloglu, Hakan Alper; Yurdagül, Erman; Tekin, Ilker; Cokorilo, O
Subgrade is one of the most important factor which affects the operating time of highways. Subgrade of highways which are a part of freight transportation network exposes to more pressure. Therefore, stabilization of subgrades becomes more important for these highways. Usage of sustainable and eco friendly resources produce economic and effective solutions for stabilization of highways. BS can be a good example of the solution which are mined in Bayburt city, the north-east of Turkey. Bayburt Stone (BS) is Eocene age and consist of zeolite minerals. Because of containing high value of amorphous silica, tuffic Bayburt stones have pozzolanic activity. Therefore, the stones have binding characteristics when they mix in lime. In this study, It is intended to show that BS waste which obtained from the stone quarries during the stone processing, can be used as a stabilizing material in subbase layers of highways. Within the scope of the study lime and lime - BS mixtures were used to improve clayey subbase layers. In the experimental studies, different amount of 0.2-80 mu m diameter BS and lime mixtures were used and improvement results of lime, lime - BS mixtures were compared. The obtained stabilization materials were tested for clayey soils. In this context nonconfined compression test, shear box, XRD, XRF and Particle Sizer tests, standard compaction and soil classification tests (Liquid-Plastic Limit Test, Sieve Analysis, Hydrometer Analysis) were performed. As a result of study it was observe that the strength of samples which obtained from lime-BS increased remarkably and it's possible to make compaction with lower compaction energies.
- BildiriYalnız künye2012SYSTEM COMPONENTS AND OPERATION CHARACTERISTICS OF ISTANBUL BRT
Yurdagül, Erman; Gerçek, Haluk; Cokorilo, O
With a population over 13 million Istanbul is the largest city in Europe. Traffic congestion is by far the most important problem that lessens the quality of life of the residents. Currently 1.8 million automobiles choke its roads daily. The rapid increase in motor vehicles, more than eightfold since 1980, has coincided with a dramatic population and economic growth. As a result, Istanbul is now overwhelmed by a flood of people and vehicles, an inadequate road network and a public transport system that has been slow to develop. This paper presents an overall evaluation of the Bus Rapid Transit (BRT) System in Istanbul of which the first phase was opened in 2007 as a relatively high-speed, high-capacity public transport mode along one of the most congested traffic arterials in the city. Presently it carries about 600,000 passengers daily over a 44 km-long alignment with 33 stations. The paper focuses on system components and presents a comparison with some major BRT systems in the world. Moreover, operational characteristics of travel patterns and ridership are analyzed with the data collected from the surveys and operator of the system; Istanbul Electricity, Tramway and Tunnel General Management (IETT). This study concludes that although the Istanbul BRT System has some drawbacks regarding the running way, access to stations, fare structure and overloaded buses, it has resulted in considerable savings in commuters' travel time and CO2 emissions. Finally, some suggestions for solving the important problems of the system are presented.
- MakaleYalnız künye2012Scopus SJRQ4Expression of cytosolic and noncytosolic carbonic anhydrase enzymes from bovine brain membrane
Demir, Nazan; Demir, Yasar; Coskun, Fatma; Tasgin, Esen
Carbonic anhydrase is an enzyme that takes responsibility in inhalation function but, until today, carbonic anhydrase is not examined if it is present in the bovine brain membrane or not. The enzyme carbonic anhydrase was purified and separately characterized according to the bonding forms in 4 steps such as outer peripheral, cytosolic, inner peripheral and integral. Affinity chromatography was used for purification of the enzyme in all four steps. The affinity column was prepared with sepharose-4B-L-tyrosine-sulphanilamide. Purified carbonic anhydrase was obtained at each step. Enzyme activity was measured by CO2 hydratase activity and esterase activity methods. Optimum pH and optimum temperature were defined for purified enzymes at each step. Morover molecular weight and purity were detected by gel filtration and SDS-PAGE electrophorose. In addition, the enzyme's Km and nmax values were found with the Lineweaver- Burk method. The obtained results are discussed in comparison with other mammalian carbonic anhydrases. Carbonic anhydrase was shown to be exist in bovine brain membrane and this enzyme was optimized.
AtıfScopus1
İncele - MakaleYalnız künye2012Scopus SJRQ1Adsorption of phenol from aqueous solution on a low-cost activated carbon produced from tea industry waste: Equilibrium, kinetic, and thermodynamic study
Gundogdu, Ali; Duran, Celal; Senturk, H. Basri; Soylak, Mustafa; Ozdes, Duygu; Serencam, Huseyin; Imamoglu, Mustafa
The ability of activated carbon which was produced by chemical activation using zinc chloride from tea industry wastes (TIWAC) to adsorb phenol molecules from aqueous solution was tested by equilibrium, kinetic, and thermodynamic parameters. Phenol adsorption on TIWAC took place with a high yield at pH values in the range 4 to 8. The optimum contact period was observed as 4.0 h and from the adsorption graphs plotted as a function of time; it was established that phenol adsorption on TIWAC conformed more to a pseudosecond-order kinetic model. Additionally, it was determined that the adsorption rate is controlled by intraparticle diffusion as well as film diffusion. It was established that phenol adsorption on TIWAC can be better defined by the Langmuir adsorption model and its adsorption capacity was 142.9 mg·g-1 from the linear Langmuir equation. Temperature had an adverse effect on adsorption yield, and hence, the adsorption process was exothermic in our case. Moreover, increasing electrolyte concentration in the medium has a positive effect on adsorption yield. From the data obtained, it was concluded that the removal of phenol from aqueous solution by TIWAC produced from tea industry wastes with a very low cost took place with an extremely high performance.
AtıfScopus228WoS212OpenAlex222İncele - BildiriYalnız künye2012Scopus SJRQ3Biosorption of CR (VI) onto pseudevernia furfuracea /aqueous solution interface
Gürses, Ahmet; Özkan, Esra; Doǧar, Çetin
This study addresses the removal of a heavy metal, Cr (VI), from aqueous solutions by using dried Psedeuvernia furforcea biomass as biosorbent. The effects of factors, such as the initial chromium concentration, contact time, temperature, biosorbent dosage and mixing rate on biosorption of the heavy metal was investigated. Furthermore, the fitting of adsorption data on Langmuir, Freundlich, BET, Temkin, Redlich-Peterson, Henderson, Smith, Halsey and Harkins-Jura adsorption isotherm models was investigated. In order to explain the metal-functional group binding mechanisms, FTIR analysis was carried out. The sorption equilibrium time was determined to be 8 hours. The amount of Cr (VI) adsorbed onto Psedeuvernia furforcea increased with increasing sorbent dosage and increasing temperature indicating endothermic nature of biosorption process. The results suggest that the physical interactions between sorbent particles and sórbate ions play an important role for the adsorption of Cr (VI) onto the biosorbent. It was found that the biosorption data of Cr (VI) by Psedeuvernia furforcea biomass were fit on the Freundlich adsorption isotherms at 293, 313, and 333K. From the experimental results, it can be concluded that Psedeuvernia furforcea can be used as an economical sorbent in the removal of these heavy metal ions.
- MakaleYalnız künye2012Scopus SJRQ2Forced convective two phase flow analysis in a circular tube equipped with twisted tapes
Omeroglu, Gokhan; Comakli, Omer; Karagoz, Sendogan; Manay, Eyuphan
In forced convection boiling systems, it is important to know the dynamic behavior for understanding and predicting the local and global stability of the system. Besides this, the instability phenomenon in the industrial processes in which two phase flow takes part becomes more of an issue. So, the mechanisms of instabilities and the ways of decreasing the stabilities are of interest of the researchers for a long time. In this study, the effects of pitch ratio, inlet temperature and the mass flow rate on two phase flow instabilities in a horizontal circular tube are investigated. The experiments are conducted under constant system pressure, and a constant heat input of 24 kW is applied to the outer surface of the circular test pipe having constant exit restriction. The results of two different pitch ratios are also compared with the smooth tube. For all investigated cases, the results are evaluated in terms of pressure drop type and density wave type oscillations. The time dependent measurements of top wall temperature, bottom wall temperature, inlet pressure and mass flow rate variations are also presented. The boundaries of the oscillations are found for both twisted tape and smooth channel. It is found that the unstable region of the flow extends while the distance between boundaries increases. It is observed that the system is more stable in the case of the lowest pitch ratio, and the increase of the pitch ratio causes system to be less stable. By the decrease of the inlet temperature, the single phase liquid region extends in the test tube and thus the system becomes more stable.
- MakaleYalnız künye2012Scopus SJRQ3The prediction of heat transfer and fluid characteristics for equilateral triangular bodies in tandem arrangement by artificial neural networks
Manay, Eyüphan; Güneş, Sibel; Akçadirci, Esra; Özceyhan, Veysel; Çakir, Ǔur; Çomakli, Ömer
The objective of this study is to investigate the effect of the spacing between equilateral dual triangular bodies symmetrically placed into the channel axis under steady state conditions on heat transfer and fluid characteristics by using artificial neural networks (ANN). The Back Propagation (BP) training algorithm was applied to train the model. The successful application proved that ANN model can be used for predicting the Nusselt number and skin friction coefficient as a convenient and effective method. The distribution of local Nusselt number, skin friction coefficient along the channel wall and overall enhancement ratio of all investigated cases are presented.
AtıfScopus5İncele - MakaleYalnız künye2012Scopus SJRQ1Determination of the effect of volcanic pumice replacement on macro void development for blended cement mortars by computerized tomography
Tekin, Ilker; Birgul, Recep; Aruntas, Huseyin Yilmaz
In this study, the effect of volcanic pumice replacements with different ratios on the macro void development was observed using CT for a period of 100 days. The cured mortar specimens were imaged by X-ray CT on different days of the experiment. Utilizing Hounsfield Unit values as guides, void volumes and ratios were identified and measured by Matlab software. SEM images supported the X-ray CT results. It is shown that X-ray CT analysis is capable of assessing the development of macro voids in the mortar specimens.
AtıfScopus22WoS21OpenAlex20İncele - Derleme MakaleYalnız künye2012Scopus SJRQ1Developing an attitude scale towards using instructional technologies for pre-service teachers
Metin, Mustafa; Kaleli Yilmaz, Gül; Coşkun, Kerem; Birişçi, Salih
The aim of this study is to develop an attitude scale towards using instructional technologies (USIT) for preservice teachers. The research was carried out with 1235 pre-service teachers that 567(45.9%) were freshman; 401 (32.5%) were sophomore; 151 (12.2%) were junior and 116 (9.4%) were senior students at different universities in Turkey. The study consists of five parts including literature review, item pool, experts' opinions, administration of scale and computing the reliability and validity. While constituting the item pool, an interview was carried out with 15 pre-service teachers related to instructional technologies. Among from 55 items which are directly related with the subject of attitude or which are selected from the relevant interviews. 45 of them were edited by expert opinions the five point likert type. The draft scale was administered to 1235 pre-service teachers. As a result of factor analysis, the number of items was reduced to 37. After carring out factor analysis the Cronbach-Alpha internal integrity coefficient of the final version of the scale was found as 0.949. By computing the reliability of USIT, the scale was ready to be used.
AtıfScopus17İncele - MakaleYalnız künye2012Scopus SJRQ1Multi-criteria decision making methods based weighted SERVQUAL scales to measure perceived service quality in hospitals: A case study from Turkey
Altuntas, Serkan; Dereli, Türkay; Yilmaz, Mustafa Kemal
The main objectives of this study are to: (i) measure hospital service quality by using analytic hierarchy process (AHP) and analytic network process (ANP) as a multi-criteria decision making method to acquire the relationship and the level of the importance among service quality measurement (SERVQUAL) dimension; (ii) find perceived service quality with respect to different hospital classes (A, B and C) in Istanbul, Turkey; (iii) compare AHP- and ANP-based weighted SERVQUAL scales with the unweighted SERVQUAL scale for public hospital service quality in terms of different hospital classes (A-B and C). First, four hospitals are selected randomly for each class and then, a questionnaire based on the SERVQUAL model is conducted for each class to measure perceived service quality with respect to five major criteria, namely tangible, reliability, responsiveness, assurance and empathy, from patients' viewpoints at hospitals. Next, the second questionnaire based on ANP is developed to evaluate the importance of criteria and construct the relations among the criteria. The study sample contains 281 outpatients totally. Three important findings are obtained in this study. First, there is a significant difference among different hospital classes regarding the perceived service quality. Second, according to the patients, the most important service quality dimensions are empathy, the knowledge of employees, sympathetic and reassuring employees, services provided at the time promised to do so, and safe feeling of patients in interactions with hospital employees. Thirdly, the, perceived service quality through the AHP- and ANP-based SERVQUAL scale is higher than that with the unweighted SERVQUAL scale.
AtıfScopus93WoS74OpenAlex100İncele - MakaleYalnız künye2012Scopus SJRQ4Investigation of anti-oxidative and anti-genotoxic effects of Origanum vulgare L. essential oil on human lymphocytes in vitro
Ceker, Selcuk; Agar, Guleray; Nardemir, Gokce; Anar, Mustafa; Kizil, Hamit Emre; Alpsoy, Lokman
Origanum vulgare L. (Lamiaceae) is a flavoring herb widely using around the world. Some preparations and extracts from O. vulgare have been used in Turkish traditional medicine to treat several ailments including digestive disorders and menstrual problems. This study is designed to examine the chemical composition and in vitro antigenotoxic and antioxidant activity of the essential oil of O. vulgare (OVE) from Turkey. The essential oil of O. vulgare was analized by using GC. OVEs that were investigated antagonistic effects against oxidative stress and the genotoxic effects of aflatoksin B1 (AFB1). Anti-genotoxic activity was evaluated by sister chromatid exchanges (SCEs) and micronucleus (MN) tests. In additional to investigating protective role of OVEs against the oxidative stress of AFB1 in vitro, oxidative status was assessed on erythrocytes by measuring following oxidative stress markers like; super oxide dismutase (SOD), glutathione peroxidase (GPx), malondialdehyde (MDA).The total of the 25 identified components are accounted for 96.03 % (GC). Major components of the oil were β-caryophyllene (20.40%), and caryophyllene oxide (34.44%). In the SCE and MN tests, it was observed that OVEs suppressed the mutagenic effects of AFB1. OVEs were observed to modulate the adverse effects of AFB1. The results of this experiment clearly reveal that OVEs have strong anti-oxidative and anti-genotoxic effect. These anti-genotoxic effects of O. vulgare essential oils are probably related to its action on the enzymatic activation system. Anti-oxidative and anti-genotoxic effect may be role of these compounds (β-caryophyllene and caryophyllene oxide).
AtıfScopus14WoS16OpenAlex12İncele - BildiriYalnız künye2012Scopus SJRQ3Optimization of process parameters for removal of Cr(VI) by Hypnum cupressiforme using response surface methodology (RSM)
Özkan, Esra; Gürses, Ahmet; Açikyildiz, Metin; Güneş, Kübra
Response surface methodology was applied to optimize the removal of chromium ion by Hypnum cupressiforme from an aqueous solution. Experiments were analyzed using response surface methodology (RSM). The biosorption process was investigated as a function of five independent factors, sorption time, sorption temperature, initial ion concentration, sorbent dosage, and mixing rate. The optimum conditions for the chromium biosorption were found to be 760 min, 313K, 30mg/L, 0.01 mg/100mL, 107 min-1 respectively, for sorption time, sorption temperature, initial ion concentration, sorbent dosage, and mixing rate.
AtıfScopus2İncele - MakaleYalnız künye2012Scopus SJRQ2Reflection and refraction of a harmonic SH wave at the interface of two dissimilar media with microheterogeneity
Altan, Burhanettin S.
Reflection and refraction of harmonic SH-waves from the interface of two dissimilar media with microheterogeneity is studied. The effect of the microheterogeneity on the overall behavior of the media is taken into account by adding higher order displacement gradients in the stress-strain relationship. It is found that a harmonic wave reflects back with the same angle of the incident wave, like in a classical case. However, it is found that the direction of propagation of the refracted wave is dependent on the wave number. It is also shown that the critical angle for which the incident wave cannot be transmitted to the other half plane is dependent on the wave number.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2012Scopus SJRQ3Effect of magnetic flux distribution and magnetic powder addition on the magnetic levitation force of Sm123 superconductors
Abdioglu, M.; Ozturk, K.; Kutuk, S.; Bolat, S.; Yanmaz, E.
Sm123 and Sm211 were prepared by melt-powder-melt-growth and solid-state-reaction techniques, respectively, to have the nominal composition of (Sm123) 0.75 (Sm211) 0.25. After the preparation of this composition, the Fe-B magnetic powder (MP) was added to the composition for 0.000, 0.010, 0.015, 0.025, 0.050 wt.% to investigate the effect of MP addition on the levitation force density (LFD). Additionally, different permanent magnets (PM) were used as magnetic-field source to investigate the effect of magnetic-field gradient on the LFD of MP added superconductors. Our findings indicate that the MP addition acts as a flux pinning centre in the sample and enhances the LFD up to 0.025 wt.% adding amount, and the optimum flux gradient which produces a screening current in the sample occurs when the B/d (magnetic-field intensity/ diameter of PM) ratio is equal to 0.060. These results imply that the experimental data can be useful for fabricating process of superconducting samples with larger MLF values, and designing of superconducting magnets, flywheel energy storage and maglev systems.
AtıfScopus10WoS10OpenAlex10İncele