Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136426
R. A. A. Khan, G. A. Ellis
In this paper, acoustic wave propagation in water-saturated sand under controlled laboratory conditions is investigated. Our method uses a combination of two fundamental frequencies f1 & f2 generated using piezoelectric transducers placed on the surface of the sand, simulating seabed with fresh water and sand. The interaction of sound (acoustic) waves in a dispersive but homogenous medium will typically generate harmonics and intermodulation terms (intermod). These interactions result in perturbations as the sum and difference frequencies. The results show that the amplitude of the intermodulation products is inversely proportional to the density and thickness of the buried inhomogeneity. For instance, 2nd order intermod term show 2 dB decreases in amplitude for 7 mm increase in thickness at constant density of plywood. For constant thickness at 5 mm there is 10 dB drop in same intermod term for change in density from plywood 550 Kg/m3 to copper 8930 Kg/m3.
{"title":"Modelling and characterization of acoustic wave propagation in seabed","authors":"R. A. A. Khan, G. A. Ellis","doi":"10.1109/NATPC.2011.6136426","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136426","url":null,"abstract":"In this paper, acoustic wave propagation in water-saturated sand under controlled laboratory conditions is investigated. Our method uses a combination of two fundamental frequencies f1 & f2 generated using piezoelectric transducers placed on the surface of the sand, simulating seabed with fresh water and sand. The interaction of sound (acoustic) waves in a dispersive but homogenous medium will typically generate harmonics and intermodulation terms (intermod). These interactions result in perturbations as the sum and difference frequencies. The results show that the amplitude of the intermodulation products is inversely proportional to the density and thickness of the buried inhomogeneity. For instance, 2nd order intermod term show 2 dB decreases in amplitude for 7 mm increase in thickness at constant density of plywood. For constant thickness at 5 mm there is 10 dB drop in same intermod term for change in density from plywood 550 Kg/m3 to copper 8930 Kg/m3.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85312611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136446
M. Abdulkarim, A. Shafie, R. Razali, W. Ahmad
Sea-Bed Logging (SBL) is an application of the marine Controlled-Source Electro-Magnetic (CSEM) method to detect the presence of hydrocarbon layer beneath the sea bed. This method depends on the large resistivity contrast between the hydrocarbon reservoir, and the surrounding layers of different resistivity. Thus, the ability to detect the presence of different resistive layers is important in processing CSEM data. In this paper, discriminant analysis is applied to simulated data aimed at classifying them into two groups based on the resistivity contrast. Discriminant function analysis is a statistical technique used to predict membership in two or more mutually exclusive groups. Two types of data, with (1000Ω) and without (1Ω) hydrocarbon was used to develop the discriminant model. Wilks' lambda is used to test the significance of the discriminant function as a whole, while measure of F-value for a variable is used to indicate its statistical significance in the discrimination between groups and extent to which that variable makes a unique contribution to the prediction of group membership. The results obtained imply that discriminant analysis has potential in detecting the contrast.
{"title":"Application of discriminant analysis to phase versus offset data in detection of resistivity contrast","authors":"M. Abdulkarim, A. Shafie, R. Razali, W. Ahmad","doi":"10.1109/NATPC.2011.6136446","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136446","url":null,"abstract":"Sea-Bed Logging (SBL) is an application of the marine Controlled-Source Electro-Magnetic (CSEM) method to detect the presence of hydrocarbon layer beneath the sea bed. This method depends on the large resistivity contrast between the hydrocarbon reservoir, and the surrounding layers of different resistivity. Thus, the ability to detect the presence of different resistive layers is important in processing CSEM data. In this paper, discriminant analysis is applied to simulated data aimed at classifying them into two groups based on the resistivity contrast. Discriminant function analysis is a statistical technique used to predict membership in two or more mutually exclusive groups. Two types of data, with (1000Ω) and without (1Ω) hydrocarbon was used to develop the discriminant model. Wilks' lambda is used to test the significance of the discriminant function as a whole, while measure of F-value for a variable is used to indicate its statistical significance in the discrimination between groups and extent to which that variable makes a unique contribution to the prediction of group membership. The results obtained imply that discriminant analysis has potential in detecting the contrast.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83986045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136261
Tiew Boon Jin, S. Mahadzir
Concept of improving or at least maintaining heat exchanger area efficiency has been widely adopted in previous studies which involving heat exchanger network retrofit case. However, application of the concept in retrofit case where fuel switching was taken as an option was less suitable. This study was carried to demonstrate the effect of existence of area efficiency constraint in retrofit case, which aims for CO2 emissions reduction targeting for existing plant, via HEN retrofit and fuel switching. Two case studies were adopted in this paper to demonstrate the effect using mathematical programming approach.
{"title":"Effect of area efficiency constraint onto CO2 emission reduction targeting for existing plant via HEN retrofit and fuel switching","authors":"Tiew Boon Jin, S. Mahadzir","doi":"10.1109/NATPC.2011.6136261","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136261","url":null,"abstract":"Concept of improving or at least maintaining heat exchanger area efficiency has been widely adopted in previous studies which involving heat exchanger network retrofit case. However, application of the concept in retrofit case where fuel switching was taken as an option was less suitable. This study was carried to demonstrate the effect of existence of area efficiency constraint in retrofit case, which aims for CO2 emissions reduction targeting for existing plant, via HEN retrofit and fuel switching. Two case studies were adopted in this paper to demonstrate the effect using mathematical programming approach.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80173877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136530
S. Ridha, S. Irawan, B. Ariwahjoedi
The inter-connected pores of cement after displaced into wellbore is believed to contribute for fluids migration. It cannot be accurately evaluated using the present sonic and acoustic methods due to its density based principles. Impedance technique is applied at elevated temperature and pressure for its pores characterization. A simple particle expansion model is proposed to solve the microstructural parameters (surface and volume of pores) in the unsetting cement that was previously encountered. The proposed model is validated by comparing the trend lines of cement prior to (our model) and after (measurement) setting. The results are employed in the Katz-Thompson equation for estimating its permeability. A comparable result of permeability calculation to the measured data is fairly observed.
{"title":"Microstructure parameter estimation in permeability calculation of well cement during early hydration by a simple particle expansion model","authors":"S. Ridha, S. Irawan, B. Ariwahjoedi","doi":"10.1109/NATPC.2011.6136530","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136530","url":null,"abstract":"The inter-connected pores of cement after displaced into wellbore is believed to contribute for fluids migration. It cannot be accurately evaluated using the present sonic and acoustic methods due to its density based principles. Impedance technique is applied at elevated temperature and pressure for its pores characterization. A simple particle expansion model is proposed to solve the microstructural parameters (surface and volume of pores) in the unsetting cement that was previously encountered. The proposed model is validated by comparing the trend lines of cement prior to (our model) and after (measurement) setting. The results are employed in the Katz-Thompson equation for estimating its permeability. A comparable result of permeability calculation to the measured data is fairly observed.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78791400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136310
King-Tak Yew, W. Ahmad, J. Jaafar
The education industry is increasingly becoming a knowledge-based community that depends critically on knowledge management (KM) and knowledge sharing (KS) activities to improve the quality of supervising postgraduate research students. Using knowledge management systems (KMS) to share good research supervision knowledge in order to support junior research supervisor in supervision knowledge needs during the supervision process has become an important issue for postgraduate research supervisor. Hence, the objective of this research is to propose a conceptual framework that integrates supervision process, KM activities, and enabling information technology (IT) for designing such a research supervision KMS. The framework highlights the critical knowledge management activities in research supervision process and the KM Technology based on the Task / Technology Fit theory. With this framework, KMS developers can work with experience research supervisors to easily identify the suitable IT associated with the postgraduate research supervision process when developing a postgraduate research supervision KMS.
{"title":"A framework for designing postgraduate research supervision knowledge management systems","authors":"King-Tak Yew, W. Ahmad, J. Jaafar","doi":"10.1109/NATPC.2011.6136310","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136310","url":null,"abstract":"The education industry is increasingly becoming a knowledge-based community that depends critically on knowledge management (KM) and knowledge sharing (KS) activities to improve the quality of supervising postgraduate research students. Using knowledge management systems (KMS) to share good research supervision knowledge in order to support junior research supervisor in supervision knowledge needs during the supervision process has become an important issue for postgraduate research supervisor. Hence, the objective of this research is to propose a conceptual framework that integrates supervision process, KM activities, and enabling information technology (IT) for designing such a research supervision KMS. The framework highlights the critical knowledge management activities in research supervision process and the KM Technology based on the Task / Technology Fit theory. With this framework, KMS developers can work with experience research supervisors to easily identify the suitable IT associated with the postgraduate research supervision process when developing a postgraduate research supervision KMS.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90060956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136336
Jawad Huamyun, A. S. Malik
While measuring the severity of acne vulgaris, it is necessary to classify the lesion types. The classification of these lesions is done by differentiating between the features of each acne lesion. All of these features are not noticeable through RGB color CCD sensor. In this report, we propose that with the use of additional sensor technology, those features may become evident, i.e. Multispectral and thermal images. We have also discussed our hypothesis about the use multispectral and thermal images in this scenario and have supported our points based on literature.
{"title":"Multispectral and thermal images for acne vulgaris classification","authors":"Jawad Huamyun, A. S. Malik","doi":"10.1109/NATPC.2011.6136336","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136336","url":null,"abstract":"While measuring the severity of acne vulgaris, it is necessary to classify the lesion types. The classification of these lesions is done by differentiating between the features of each acne lesion. All of these features are not noticeable through RGB color CCD sensor. In this report, we propose that with the use of additional sensor technology, those features may become evident, i.e. Multispectral and thermal images. We have also discussed our hypothesis about the use multispectral and thermal images in this scenario and have supported our points based on literature.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89858742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136253
M. Mushtaq, I. B. Tan, C. Devi, S. Majidaie, M. Nadeem, Susan Y. C. Lee
Fatty Acid Methyl Esters (FAMEs) from transesterification of Jatropha oil were obtained by both acid and base catalyzed transesterification reactions. These FAMEs were epoxidized in or without solvent by either peroxyformic acid or peroxyacetic acid, formed in situ by 30% hydrogen peroxide. n-hexane was used as solvent. Detailed study regarding effects of type and concentration of organic acid used in and without solvent at temperatures 50°C, 60°C and 69°C is presented here. Molar ratio of FAMEs: H2O2 was fixed at 1:3.5 and reaction time was fixed at 6 hours. The formic acid-FAMEs molar ratio was (FAMEs: Formic acid) 1:0.45, while for acetic acid molar ratio was (FAMEs: Acetic acid) 1:0.60. For formic acid, it was found that without solvent, the conversion was 79% while in solvent; it was found that the highest conversion (83%) was obtained at a temperature of 60°C. When acetic acid as oxygen carrier was used, it required 1.5% H2SO4 as catalyst for the reaction in solvent to give maximum conversion of 71%. Without solvent the conversion was 74% at 69°C. The products were analyzed by NMR, GC-MS, FT-IR and volumetric analyses for qualitative and quantitative determinations.
{"title":"Epoxidation of Fatty Acid Methyl Esters derived from Jatropha oil","authors":"M. Mushtaq, I. B. Tan, C. Devi, S. Majidaie, M. Nadeem, Susan Y. C. Lee","doi":"10.1109/NATPC.2011.6136253","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136253","url":null,"abstract":"Fatty Acid Methyl Esters (FAMEs) from transesterification of Jatropha oil were obtained by both acid and base catalyzed transesterification reactions. These FAMEs were epoxidized in or without solvent by either peroxyformic acid or peroxyacetic acid, formed in situ by 30% hydrogen peroxide. n-hexane was used as solvent. Detailed study regarding effects of type and concentration of organic acid used in and without solvent at temperatures 50°C, 60°C and 69°C is presented here. Molar ratio of FAMEs: H2O2 was fixed at 1:3.5 and reaction time was fixed at 6 hours. The formic acid-FAMEs molar ratio was (FAMEs: Formic acid) 1:0.45, while for acetic acid molar ratio was (FAMEs: Acetic acid) 1:0.60. For formic acid, it was found that without solvent, the conversion was 79% while in solvent; it was found that the highest conversion (83%) was obtained at a temperature of 60°C. When acetic acid as oxygen carrier was used, it required 1.5% H2SO4 as catalyst for the reaction in solvent to give maximum conversion of 71%. Without solvent the conversion was 74% at 69°C. The products were analyzed by NMR, GC-MS, FT-IR and volumetric analyses for qualitative and quantitative determinations.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77092402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136425
C. Sovuthy, W. P. Wen
A novel microwave planar triple-mode resonator filter structure to achieve triple-mode rather than dual-mode response has been developed for miniaturization of high selectivity narrow-band microwave bandpass filter. The filter is miniaturized by incorporating a novel stepped impedance triple-mode into resonator. The filter has a passband bandwidth of 6% at 1 GHz. The measured result shows less than 1.1 dB passband insertion loss and more than 30 dB return loss are obtained.
{"title":"Microwave planar triple-mode resonator filter","authors":"C. Sovuthy, W. P. Wen","doi":"10.1109/NATPC.2011.6136425","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136425","url":null,"abstract":"A novel microwave planar triple-mode resonator filter structure to achieve triple-mode rather than dual-mode response has been developed for miniaturization of high selectivity narrow-band microwave bandpass filter. The filter is miniaturized by incorporating a novel stepped impedance triple-mode into resonator. The filter has a passband bandwidth of 6% at 1 GHz. The measured result shows less than 1.1 dB passband insertion loss and more than 30 dB return loss are obtained.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83534022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136342
Roaa A. Mohmmad, T. Ibrahim, M. Begam
This research investigates the possibility of differentiating slaughtered and non-slaughtered goat meat using capacitor. The use of dielectric spectra to discriminate slaughtered and non-slaughtered meat in goat muscle during postmortem period was evaluated. The changes in dielectric properties during meat ageing were analyzed in terms of permittivity for each meat test. For these purposes, the capacitance was measured from 10 Hz to 500 Hz perpendicular to muscle fiber directions. The measured values were used to calculate the dielectric constant of meat at various time intervals. Significant differences in dielectric properties between slaughtered and non-slaughtered tissue was observed in the experimental Results. Thus, the dielectric properties can be used to differentiate between slaughtered and non-slaughtered meat.
{"title":"Characterization of slaughtered and non-slaughtered goat meat using low frequency","authors":"Roaa A. Mohmmad, T. Ibrahim, M. Begam","doi":"10.1109/NATPC.2011.6136342","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136342","url":null,"abstract":"This research investigates the possibility of differentiating slaughtered and non-slaughtered goat meat using capacitor. The use of dielectric spectra to discriminate slaughtered and non-slaughtered meat in goat muscle during postmortem period was evaluated. The changes in dielectric properties during meat ageing were analyzed in terms of permittivity for each meat test. For these purposes, the capacitance was measured from 10 Hz to 500 Hz perpendicular to muscle fiber directions. The measured values were used to calculate the dielectric constant of meat at various time intervals. Significant differences in dielectric properties between slaughtered and non-slaughtered tissue was observed in the experimental Results. Thus, the dielectric properties can be used to differentiate between slaughtered and non-slaughtered meat.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88798021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-09-01DOI: 10.1109/NATPC.2011.6136451
M. Akhtar, N. Yahya, Nadeem Nasir, M. Kashif
Sea bed logging is a new technology being implemented for deep target exploration. In seabed logging, the magnitude of electromagnetic (EM) wave for detection of hydrocarbon reservoir is very important and still remained challenge. New Al transmitter with (Y3Fe5O12 with and without MWCNTs) magnetic feeders was used in a marine scaled tank to enhance the magnetic field strength. Experiments were done in marine lab scale tank to replicate the real seabed environment. Y3Fe5O12 with and with out multiwall carbon nano tubes (MWCNTs) were synthesized by using sol gel-self combustion hybrid method. Samples were sintered at 550°C, 750°C and 1050°C to get the required characteristics of the garnet nanoparticles. Y3Fe5O12 samples with and without MWCNTs were characterized by using XRD, RAMAN, FESEM and Impedance network analyzer. X-ray diffraction results revealed that the best Y3Fe5O12 phase was appeared at the sintering temperature of 1050°C. Nanoparticles sizes ranging from 70 to 110 nm were obtained by using sol gel-self combustion hybrid method. Raman results also demonstrate the confirmation of garnet structure of Y3Fe5O12 at sintering temperature of 1050°C. Field emission scanning electron microscopy (FESEM) was used to see the morphology of Y3Fe5O12 with and with out MWCNTs composites. Magnetic characterization results illustrates that Y3Fe5O12 with MWCNTs at 1050°C has higher Initial permeability (33.302) and high Q-factor (55.104), where as low loss factor (0.0003) was also investigated for Y3Fe5O12 — MWCNTs composites. It was observed that by using Y3Fe5O12-MWCNTs polymer composites toroid as magnetic feeders resulted 210% increase in magnetic field strength.
{"title":"Synthesis and characterizations of Y3Fe5O12-MWCNTs composites for SBL application","authors":"M. Akhtar, N. Yahya, Nadeem Nasir, M. Kashif","doi":"10.1109/NATPC.2011.6136451","DOIUrl":"https://doi.org/10.1109/NATPC.2011.6136451","url":null,"abstract":"Sea bed logging is a new technology being implemented for deep target exploration. In seabed logging, the magnitude of electromagnetic (EM) wave for detection of hydrocarbon reservoir is very important and still remained challenge. New Al transmitter with (Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> with and without MWCNTs) magnetic feeders was used in a marine scaled tank to enhance the magnetic field strength. Experiments were done in marine lab scale tank to replicate the real seabed environment. Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> with and with out multiwall carbon nano tubes (MWCNTs) were synthesized by using sol gel-self combustion hybrid method. Samples were sintered at 550°C, 750°C and 1050°C to get the required characteristics of the garnet nanoparticles. Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> samples with and without MWCNTs were characterized by using XRD, RAMAN, FESEM and Impedance network analyzer. X-ray diffraction results revealed that the best Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> phase was appeared at the sintering temperature of 1050°C. Nanoparticles sizes ranging from 70 to 110 nm were obtained by using sol gel-self combustion hybrid method. Raman results also demonstrate the confirmation of garnet structure of Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> at sintering temperature of 1050°C. Field emission scanning electron microscopy (FESEM) was used to see the morphology of Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> with and with out MWCNTs composites. Magnetic characterization results illustrates that Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> with MWCNTs at 1050°C has higher Initial permeability (33.302) and high Q-factor (55.104), where as low loss factor (0.0003) was also investigated for Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> — MWCNTs composites. It was observed that by using Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf>-MWCNTs polymer composites toroid as magnetic feeders resulted 210% increase in magnetic field strength.","PeriodicalId":6411,"journal":{"name":"2011 National Postgraduate Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82776530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：