Cancer is a leading public health problem worldwide. In many developing countries, cancer tends t... more Cancer is a leading public health problem worldwide. In many developing countries, cancer tends to present in predominantly advanced stages, to a certain extent due to lack of comprehensive screening and poor access to efficient management. This study was carried out to describe the pattern of cancers managed in the Department of Radiotherapy and Oncology in Usmanu Danfodiyo University Teaching Hospital Sokoto, North-western Nigeria. This was a cross-sectional descriptive study involving patients with malignancies that attended the new Oncology Department of the Usman Danfodiyo University Teaching Hospital Sokoto, North-West Nigeria for the period of one year (June 2013 - May 2014). The data was analyzed using SPSS (versions 20). A total of 210 patients with complete records met the criteria for the study. Majority 162 (77.1%) were females with a mean age of 45.68±12.4 years. The male patients were 48 (22.9%) with mean age 46.27±16.5. The spectrum of malignant lesions observed were cancer of the cervix 77 (36.67%), breast cancer 74 (35.24%), nasopharyngeal cancer 20 (9.52%), cancer of the larynx 18 (8.57%) and rectal cancer 14 (6.67%). Late presentation was most common with 6 (3%), 101 (49.8%) and 58 (28.6%) patients presenting at stage I, III and IV, respectively. The study demonstrates that Cancer of the cervix is the leading malignancy in the study population.
2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491), 2003
In this paper, the application of a novel and computationally enhances genetic algorithm (GA) for... more In this paper, the application of a novel and computationally enhances genetic algorithm (GA) for solving the reactive power dispatch problem is presented. In order to attain a significant reduction in the computational time of GA, a systematic procedure of reactive power control device pre-selection mechanism is herein proposed to choose a-priori subsets of the available control devices, which maximally
2011 5th International Power Engineering and Optimization Conference, 2011
... Grid System Considering Voltage and Line Flow Constraints Rasa> Soreme&... more ... Grid System Considering Voltage and Line Flow Constraints Rasa> Soreme>un, Abdullah Asuhaimi Mohd Zin, Abdullahi Amoo, Ganiyu Ba>are, Usman Aliyu ... 5 References [1] Sambo, AS 2008: Matching Electricity Supply with Demand in Nigeria, a 4th Quarter Journal of ECN. ...
2012 IEEE International Power Engineering and Optimization Conference, 2012
ABSTRACT A lot of things determine the life expectancy of a transformer such as overheating due t... more ABSTRACT A lot of things determine the life expectancy of a transformer such as overheating due to triplen harmonics, unbalanced loading, vibro-acoustic noise and so on. For this reason, this paper presents the investigation carried out on the magnetostrictive sound of Bauchi, 30/40 MVA, 132/33 KV substation transformer. Readings were taken using standard audio recording instrument for various loading and voltage conditions in the mornings, afternoons and nights for six days and the offline assessment was carried out using digital spectrum analyzer. However, no access could be gained to the variation of certain important parameters, like changing of core dimensions, loosing or tightening of core and so on, for the substation transformer in-situ in the substation hence separate laboratory test transformers were used in the assessment of the effect of core damping pressure, construction looseness and transformer saturation on the vibro-acoustic noise. Conclusively, increasing the operation voltage of transformer tends to produce more magnetostriction effect while loosening core lamination increases the energy losses.
2009 15th International Conference on Intelligent System Applications to Power Systems, 2009
An optimal transient controller for a synchronous generator in a multi-machine power system is de... more An optimal transient controller for a synchronous generator in a multi-machine power system is designed using the concept of flatness-based feedback linearization in this paper. The computation of the flat output and corresponding controller for reduced order model of the synchronous generator is presented. The required feedback gains used to close the linearization loop is optimized using particle swarm optimization for maximum damping. Typical results obtained for transient disturbances on a two-area, four-generator power system equipped with the proposed controller on one generator and conventional power system stabilizers on the remaining generators are presented. The effectiveness of the flatness-based controller for multi-machine power systems is discussed.
Proceedings of International Conference on Control Applications, 1995
Effects of unwanted distortions on power system network voltage and current phasor quantities dur... more Effects of unwanted distortions on power system network voltage and current phasor quantities during faults could adversely affect the reliability and discrimination of protective relays. This paper is principally concerned with the digital relaying concept based on multi-state Kalman filtering approach to minimise such problems. It seeks to characterise the effects of noise, harmonics and DC offset distortions on Kalman
... This process, in turn, favors the propagation of genes of those animals that have been succes... more ... This process, in turn, favors the propagation of genes of those animals that have been successful in their for-aging strategies. ... Page 5. DAS et al.: BIO-INSPIRED ALGORITHMS FOR THE DESIGN OF POWER SYSTEM STABILIZERS: SPPSO AND BFA 1449 ...
Power Engineering Society, IEEE General Meeting, 2006
In determining the correct operation of relays of a protection scheme, proper representation of i... more In determining the correct operation of relays of a protection scheme, proper representation of instrument transformers and their behavior in conditions where there can be transient is very critical. This paper presents a simulation model for assessing the transient performance of capacitive voltage transformers (CVTs). In order to test the validity of the developed model, four CVT operational conditions are
Cancer is a leading public health problem worldwide. In many developing countries, cancer tends t... more Cancer is a leading public health problem worldwide. In many developing countries, cancer tends to present in predominantly advanced stages, to a certain extent due to lack of comprehensive screening and poor access to efficient management. This study was carried out to describe the pattern of cancers managed in the Department of Radiotherapy and Oncology in Usmanu Danfodiyo University Teaching Hospital Sokoto, North-western Nigeria. This was a cross-sectional descriptive study involving patients with malignancies that attended the new Oncology Department of the Usman Danfodiyo University Teaching Hospital Sokoto, North-West Nigeria for the period of one year (June 2013 - May 2014). The data was analyzed using SPSS (versions 20). A total of 210 patients with complete records met the criteria for the study. Majority 162 (77.1%) were females with a mean age of 45.68±12.4 years. The male patients were 48 (22.9%) with mean age 46.27±16.5. The spectrum of malignant lesions observed were cancer of the cervix 77 (36.67%), breast cancer 74 (35.24%), nasopharyngeal cancer 20 (9.52%), cancer of the larynx 18 (8.57%) and rectal cancer 14 (6.67%). Late presentation was most common with 6 (3%), 101 (49.8%) and 58 (28.6%) patients presenting at stage I, III and IV, respectively. The study demonstrates that Cancer of the cervix is the leading malignancy in the study population.
2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491), 2003
In this paper, the application of a novel and computationally enhances genetic algorithm (GA) for... more In this paper, the application of a novel and computationally enhances genetic algorithm (GA) for solving the reactive power dispatch problem is presented. In order to attain a significant reduction in the computational time of GA, a systematic procedure of reactive power control device pre-selection mechanism is herein proposed to choose a-priori subsets of the available control devices, which maximally
2011 5th International Power Engineering and Optimization Conference, 2011
... Grid System Considering Voltage and Line Flow Constraints Rasa> Soreme&... more ... Grid System Considering Voltage and Line Flow Constraints Rasa> Soreme>un, Abdullah Asuhaimi Mohd Zin, Abdullahi Amoo, Ganiyu Ba>are, Usman Aliyu ... 5 References [1] Sambo, AS 2008: Matching Electricity Supply with Demand in Nigeria, a 4th Quarter Journal of ECN. ...
2012 IEEE International Power Engineering and Optimization Conference, 2012
ABSTRACT A lot of things determine the life expectancy of a transformer such as overheating due t... more ABSTRACT A lot of things determine the life expectancy of a transformer such as overheating due to triplen harmonics, unbalanced loading, vibro-acoustic noise and so on. For this reason, this paper presents the investigation carried out on the magnetostrictive sound of Bauchi, 30/40 MVA, 132/33 KV substation transformer. Readings were taken using standard audio recording instrument for various loading and voltage conditions in the mornings, afternoons and nights for six days and the offline assessment was carried out using digital spectrum analyzer. However, no access could be gained to the variation of certain important parameters, like changing of core dimensions, loosing or tightening of core and so on, for the substation transformer in-situ in the substation hence separate laboratory test transformers were used in the assessment of the effect of core damping pressure, construction looseness and transformer saturation on the vibro-acoustic noise. Conclusively, increasing the operation voltage of transformer tends to produce more magnetostriction effect while loosening core lamination increases the energy losses.
2009 15th International Conference on Intelligent System Applications to Power Systems, 2009
An optimal transient controller for a synchronous generator in a multi-machine power system is de... more An optimal transient controller for a synchronous generator in a multi-machine power system is designed using the concept of flatness-based feedback linearization in this paper. The computation of the flat output and corresponding controller for reduced order model of the synchronous generator is presented. The required feedback gains used to close the linearization loop is optimized using particle swarm optimization for maximum damping. Typical results obtained for transient disturbances on a two-area, four-generator power system equipped with the proposed controller on one generator and conventional power system stabilizers on the remaining generators are presented. The effectiveness of the flatness-based controller for multi-machine power systems is discussed.
Proceedings of International Conference on Control Applications, 1995
Effects of unwanted distortions on power system network voltage and current phasor quantities dur... more Effects of unwanted distortions on power system network voltage and current phasor quantities during faults could adversely affect the reliability and discrimination of protective relays. This paper is principally concerned with the digital relaying concept based on multi-state Kalman filtering approach to minimise such problems. It seeks to characterise the effects of noise, harmonics and DC offset distortions on Kalman
... This process, in turn, favors the propagation of genes of those animals that have been succes... more ... This process, in turn, favors the propagation of genes of those animals that have been successful in their for-aging strategies. ... Page 5. DAS et al.: BIO-INSPIRED ALGORITHMS FOR THE DESIGN OF POWER SYSTEM STABILIZERS: SPPSO AND BFA 1449 ...
Power Engineering Society, IEEE General Meeting, 2006
In determining the correct operation of relays of a protection scheme, proper representation of i... more In determining the correct operation of relays of a protection scheme, proper representation of instrument transformers and their behavior in conditions where there can be transient is very critical. This paper presents a simulation model for assessing the transient performance of capacitive voltage transformers (CVTs). In order to test the validity of the developed model, four CVT operational conditions are
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