Bulunan: 268 Adet 0.003 sn
Koleksiyon [14]
Tam Metin [2]
Yazar [20]
Yayın Yılı [20]
Konu Başlıkları [20]
Yayıncı [20]
Yayın Dili [2]
Dergi Adı [20]
Post polymerization of saturated and unsaturated poly(3-hydroxy alkanoate)s

Erduranlı, Haydar | Hazer, Baki | Borcaklı, Mehlika

Conference Object | 2008 | Macromolecular Symposia269 ( 1 ) , pp.161 - 169

Chemical modification is useful to diversify poly(3-hydroxyalkanoate)s, for medical and industrial applications. In this manner, transesterification reactions of poly(3-hydroxy butyrate) were carried out under reflux condition of 1,2-dichlorobenzene in the presence of 1,4-butane diol, poly(ethyleneglycol) bis(2-aminopropyl ether) with molecular weights of 1000 and 2000, poly(ethylene glycol)methacrylate or glycerol at 180°C. Addition reactions of bromine and -SH groups of 3-mercaptopropionic acid to the double bond of poly(3-hydroxy-io-undecenoate) were also carried out. Functionalized poly(3-hydroxyalkanoate)s were characterized us . . .ing 1H NMR, FTIR, GPC and thermal analysis techniques. Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA Daha fazlası Daha az

Modeling of three-axis gimbal system on unmanned air vehicle (UAV) under external disturbances [Insansiz Hava Araci Üzerinde Bulunan 3 Eksenli Yalpa Sisteminin Diş Bozucu Altinda Modellenmesi]

Altan, Aytaç | Hacıoğlu, Rıfat

Conference Object | 2017 | 2017 25th Signal Processing and Communications Applications Conference, SIU 2017 , pp.161 - 169

This study focuses on the modelling of 3 axis gimbal system with the RRR joint structure on the Unmanned Aerial Vehicle (UAV), which is autonomously moving for the target tracking, based on experimental input (motor velocities) and output (end effector position) data. The fact that UAVs move in a certain direction and that the camera on the end effector of the gimbal system on it is adhere to the correct target attracts many researchers. The transfer function of the 3 axis gimbal system is obtained by linearly structured OE-Output Error model using experimentally obtained data under different external disturbance effects. Model degr . . .ee is determined and data set based verification is applied. Also, the performance is compared by examining the effect of external disturbance in the transfer function obtained. © 2017 IEEE Daha fazlası Daha az

EOG controlled direction detect system with neuro-fuzzy approach

Erkaymaz, Hande | Özer, Mahmut | Kaya, Ceren

Conference Object | 2015 | 2015 19TH NATIONAL BIOMEDICAL ENGINEERING MEETING (BIYOMUT) , pp.161 - 169

The eye, which has the most advanced features among sense organs, has a perfect functioning on people. Furthermore, as it is placed in the lead role of vision, shows the importance for people is quite big. Nowadays, biomedical devices developed for patients who have mobility are benefiting from eye movements. Electrooculogram studies are especially designed on the basis of the signal depending on the movement of your eyes. Electrical origin of EOG biological signal, that occur around the eye pupil, makes an attempt to meet the needs of patients by the right, left, up, down and blinking action. In this study, 4 basic differences exis . . .ting in the direction of movement using voltage controlled EOG signal studies have tried to determine the Neuro-Fuzzy model. Determining the direction of Neuro-Fuzzy control system demonstrates how it can be successfully used as. In addition, control algorithms of artificial intelligence systems that use this kind of eye signals benefiting from the input of the detection process is advantageous in the classification of complex environment Daha fazlası Daha az

A multi-source data approach for the investigation of land subsidence in the Konya basin, Turkey

Calò F. | Notti D. | Galve J.P. | Abdikan S. | Görüm T. | Orhan O. | Makineci H.B.

Conference Object | 2018 | International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives42 ( 3W4 ) , pp.129 - 135

Groundwater depletion caused by rapid population growth, global climate change, water resources overexploitation is a major concern in many regions of the world. Consequences are not limited to a non-renewable water loss but extend to environmental degradation and geo-hazards risk increase. In areas where excessive groundwater withdrawal occurs, land subsidence induced by aquifer compaction is observed, resulting in severe socio-economic damage for the affected communities. In this work, we apply a multi-source data approach to investigate the fragile environment of Konya plain, central Turkey. The area, which is under strong anthro . . .pogenic pressures and faces with serious water-related problems, is widely affected by land subsidence. In order to analyze the spatial and temporal pattern of the subsidence process we use the Small BAseline Subset DInSAR technique to process two datasets of ENVISAT SAR images spanning the 2002-2010 period and to produce ground deformation maps and associated time-series. Results, complemented with meteorological, stratigraphic and piezometric data as well as with land-cover information, allow us to obtain a comprehensive picture of the climatic, hydrogeological and human dynamics of the study area. © Authors 2018. CC BY 4.0 License Daha fazlası Daha az

Influence of filler amount and content on the mechanical performance of joints bonded with metal powder filled adhesive

Kavak N. | Altan E.

Conference Object | 2014 | Materials Science Forum773-774 , pp.226 - 233

The objective of this study is to investigate the surface roughness that effect the capability of adhesive with adding aluminium powder and 63/37 Sn-Pb soft solder powder to the epoxy to increase the mechanical strength of joints. The adhesive strength of the joints was determined by utilizing the single-lap shear test. As seen from the experiments, the surface roughness has an important effect on the strength of adhesive bonded joints. Experimental results show that joints prepared by adhesive which was modified, adding in the amount of 5 wt% 63/37 Sn-Pb powder have more mechanical strength than joints compared to one which is prep . . .ared by adding aluminium powder with different ratios as 5, 25,50 wt%. © (2014) Trans Tech Publications, Switzerland Daha fazlası Daha az

Generation and validation of digital elevation models based on satellite images

Büyüksalih G. | Jacobsen K.

Conference Object | 2006 | Revue Francaise de Photogrammetrie et de Teledetection ( 184 ) , pp.17 - 22

Digital elevation models (DEMs) are available free of charge for most areas of the world. For example the C-band height model of the Shuttle Radar Topography Mission (SRTM) has with a standard deviation of 3m to 5m for flat and open areas accuracy sufficient for several cases, but the spacing of 3 arcsec is causing a loss of morphologic information in mountains. Even with quite less accurate DEMs based on ASTER, more morphologic details can be achieved. With the very high resolution satellite images a higher accuracy and quite more details than with the SRTM DEM can be reached. In open areas the vertical accuracy is linear depending . . . upon the height-to-base-ratio, but in the city this is quite more difficult. With a height-to-base-ratio of 1.0 in the city the corresponding image details of the high resolution scenes are too different, so that only a limited percentage of the model points can be matched automatically. The optimal convergence angle is quite smaller. In addition with a height-to-base-ratio dose to 1.0 only few points on the street level can be achieved in densely build up areas. Different types of satellite image models have been analysed for completeness, accuracy and morphologic details in relation to a reference DEM based on large scale photogrammetry Daha fazlası Daha az

Experimental investigation on the low cycle fatigue life of piles

Karalar M. | Dicleli M.

Conference Object | 2018 | Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges - Proceedings of the 9th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2018 , pp.2703 - 2708

In this study, the low cycle fatigue tests are conducted to investigate the fatigue life of steel H-piles subjected to thermal induced cyclic strains/displacements. Review of literature revealed that there are few experimental research data on the low cycle fatigue performance of integral bridge steel H-piles. For this purpose, experimental studies on full scale steel H-pile specimens are conducted to simulate cyclic behavior of steel H-piles under thermal effects in integral bridges by considering the effect of axial load combined with large amplitude strain cycles with various amplitude levels. Using experimental test results, the . . . effect of axial load level is investigated on the low cycle fatigue performance of integral bridge steel H–piles. It is observed that the effect of axial load on the low cycle fatigue performance of integral bridge steel H-piles are so important to reduce the bending stresses in the steel H-piles and also increase the low-cycle fatigue performance of steel H-piles at the abutments of integral bridges at the moderate strain amplitudes. Moreover, it is observed that at large strain amplitudes the effect of local buckling should be considered more than the effect of axial load on the low cycle fatigue life of steel H piles at the abutments of integral bridges. © 2018 Taylor & Francis Group, London Daha fazlası Daha az

Modeling of elastic modulus of concrete containing fly Ash by gene expression programming

Sarıdemir M. | Bilir T.

Conference Object | 2016 | Sustainable Construction Materials and Technologies2016-August , pp.2703 - 2708

The gene expression programming that is one of the artificial intelligence techniques, have been commonly used to model some of civil engineering applications. In this study, two models in the gene expression programming for predicting the elastic modulus of concrete containing fly Ash have been developed. First model is proposed for the elastic modulus prediction from compressive strength of concrete containing fly Ash, and second model is proposed for the elastic modulus prediction from amount of fly Ash and compressive strength of concrete containing fly ash. For the aim of building these models, the experimental results for 259 . . .specimens presented with 132 different concrete mixtures were collected from the literature. The training and testing sets of these models are divided without prior planning from the experimental results. These models are also validated with 122 data of experimental results other than the data used in training and testing sets. Moreover, the results obtained from these models are compared with the experimental results and formulas results given by some national building codes. These comparisons revealed that the equations of these models appeared to well concur with the experimental results and found to be very reliable. © 2016 International Committee of the SCMT conferences. All rights reserved Daha fazlası Daha az

A new natural biomaterial: Sheep dentine derived hydroxyapatite

Akyurt N. | Yetmez M. | Karacayli U. | Gunduz O. | Agathopoulos S. | Gokce H. | ÖveÇoglu M.L.

Conference Object | 2012 | Key Engineering Materials493-494 , pp.281 - 286

Hydroxyapatite (HA) is a particularly attractive material for bone and tooth implants since it does not only closely resemble human tooth and bone mineral but it has also biologically proven to be compatible with these tissues. The applications of pure HA are restricted to non load bearing implants due to the poor mechanical properties of HA. Biomaterials of synthetic HA are highly reliable but the synthesis of HA is often complicate and expensive. Bioceramics of naturally derived biological apatites are more economic. Aim of the present work is to introduce sheep teeth dentine HA material as an alternative source of bioactive bioma . . .terials for grafting purposes. The work was started with such a way that extracted sheep teeth were cleaned. The teeth were calcinated at 850°C in air. It was seen that enamel matter was easily separated from dentine after calcination. The collected dentine parts were crushed and ball milled. The powder was pressed between hardened steel dies to produce samples suitable for compression and microhardness tests. The obtained powder compacts were sintered at different temperatures, specifically 1000, 1100, 1200, and 1300°C in air. Results of microhardness and compression strength (along with the statistical analysis of these results) as well as those of SEM and XRD analyses are presented. In the literature, there is very little information about the mechanical properties of dentine and enamel matter derived from sheep, bovine and human. The highest compression strength value in the present study was measured around 146 MPa (from human dentine derived HA the highest value was almost 60 MPa after sintering at 1300°C). The best microhardness in the present study was found as nearly 125 HV. The results of this study showed that the HA material produced from sheep tooth dentine can be qualified as a promising source of HA needed to produce bioactive ceramics. © (2012) Trans Tech Publications, Switzerland Daha fazlası Daha az

Growth and pubertal development in adolescent male wrestlers

Piskin I.E. | Gümüs M. | Bayraktaroglu T. | Akalin T.C. | Yamaner F.

Conference Object | 2018 | Journal of Sports Medicine and Physical Fitness58 ( 6 ) , pp.852 - 856

Background: Adolescence is a crucial period for linear growth, and sports training during this time may have positive or negative effects on some physiological processes as growth. The purpose of this study was to evaluate the effects of intense training during somatic growth on the onset of puberty and growth development in adolescent wrestlers. Methods: fifty adolescent male wrestlers and twenty-one sedentary healthy male controls aged between 13-15 years were selected. The wrestlers were from fve different wrestling schools and were active at competitive level. The maturity status of the subjects and data about the anthropometric . . . characteristics including age, body weight, height, and Body Mass index (BMi) were evaluated. Serum testosterone, dehydroepiandrosterone sulphate, follicle stimulating hormone, luteinizing hormone, prolactin, cortisol, insulin like growth factor-1 (iGf-1), thyroid stimulating hormone (TSh) and free thyroxin were determined. Results: Anthropometric characteristics and puberty levels according to the Tanner stage were similar in both groups. There were no signifcant differences between wrestlers and sedentary control groups in sex hormones, cortisol, iGf-1, prolactin levels (p>0.05) but TSh concentrations differed signifcantly (P=0.015). Conclusions: The results suggested that training in adolescent male wrestlers did not signifcantly change resting sex hormones or alter the onset of puberty as determined by assessment of pubertal stages. The wrestlers had lower body fat and greater energy expenditure per week, there were no signifcant differences in height, weight, or BMI. © 2017 Edizioni Minerva Medica Daha fazlası Daha az

Investigation of various epidemic diseases in some countries by mathematical models SI and SIS

Çilli A. | Ergen K.

Conference Object | 2017 | AIP Conference Proceedings1815 , pp.852 - 856

In this study, efficiency of SI and SIS mathematical models were defined in the prediction of the number of infected people with malaria and Acquired Immune Deficiency Syndrome (AIDS) as infectious diseases. Afghanistan and Angola were selected for their geographical and economical features. Although the models do not predict exact numbers for each year, in a long term and in a normal conditions (unless there are external parameters such as natural disaster, war, emigration and terrorism) they can predict the trend for the diseases and can tell when to disappear. Therefore, updating data are of importance to achieve the powerful pre . . .diction. © 2017 Author(s) Daha fazlası Daha az

Image reconstruction from phase hologram obtained by using single phase information [Tek faz bilg? kullanilarak elde edilen faz hologramindan görüntünün geri elde edilmesi]

Kaya G.U. | Sarac Z. | Tayyar D.O. | Bolumu F.

Conference Object | 2014 | 2014 22nd Signal Processing and Communications Applications Conference, SIU 2014 - Proceedings , pp.148 - 151

In this study, it is aimed to obtain the real time image of the object, whose off-axis hologram recording is saved on CCD camera, from digital phase hologram. For creating the phase hologram, the phase information of the hologram recording on CCD camera is obtained. When the phase information is obtained, the Fourier transform algorithm and continuous wavelet transform methods are used. Finally, the using methods in this study are compared in terms of obtaining real time image having a high image quality and minimum power loss. © 2014 IEEE.

6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.

Bu site altında yer alan tüm kaynaklar Creative Commons Alıntı-GayriTicari-Türetilemez 4.0 Uluslararası Lisansı ile lisanslanmıştır.