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On S-Boxes and Their Grading by Soft Set Based Decision Making Methods

Thesis Info

Access Option

External Link

Author

Medhit, Sadia

Supervisor

Tariq Shah

Program

PhD

Institute

Quaid-I-Azam University

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2016

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/7369/1/Sadia_Midhet.pdf

Added

2021-02-17 19:49:13

Modified

2023-03-20 22:13:22

ARI ID

1676726802527

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روزینہ یاسمین تحقیق کے آئینے میں

روزینہ یاسمین نے شعبہ اردو یونیورسٹی آف سیالکوٹ کے زیر اہتمام ایم ایس اردو کا تحقیقی مقالہ ’’ ماخذ اور تحصیل ‘‘ کا تو ضیحی اشاریہ مرتب کیا ہے۔ اشاریہ سازی لائبریری کا سائنسی علم ہے۔ہندوستان میں اشاریہ سازی کی ابتداخدا بخش پٹنہ لائبریری سے ہوئی۔ محققین نے اشاراتی کتب اور فہارس کو قدر سے دیکھا۔ اشاریہ سازی اور فہارس سے وقت کی بچت ہوتی ہے اور محقق ان دیکھے سفر کی صو بت سے محفوظ رہتا ہے اور علوم و فنون کے سنگم رہبری کی نشاندہی کرتا ہے۔ وقت گزرنے کے ساتھ ساتھ ایسی کتب کی افادیت بڑھتی جائے گی اسے علم وادب کا دروازہ اور علوم وفنون کی کلید کہا جاتا ہے۔کلید کے بغیر علم وادب کا دروازہ نہیں کھلتا۔ مولفہ نے  اس اشاریہ کے ذریعے اردو شعرو ادب کی دنیا میں داخل ہونے والے نئے محققین کے لئے علمی در،وا کیا ہے۔انھوں نے علمی سمندر میں اضطراب پیدا کر نے کی شعوری کاوش کی ہے۔ روزینہ  اپنے مقالے میں رسائل وجرائد کی وضاحت کرتے ہوئے کہتی ہے’’ رسالہ ان مطبو عات کو کہتے ہیں جو وقفے سے بار بار شائع ہوتے ہیں۔ وہ ماہانہ ، دو ماہی ، سہہ ماہی ، ششمائی اور سالا نہ  بھی ہو سکتے ہیںجنھیں جریدہ بھی کہتے ہیں‘‘

اہل قلم کی ان رسائل و جرائد میں تخلیقات اورنگار شات شائع ہوئیں۔ شعر وادب اور دیگر علوم وفنو ن کی اشاعت میں رسائل وجرائد نے اہم کر دار ادا کیا۔ ا ن رسائل و جرائد کی افادیت اظہر من الشمس ہے ۔ان رسائل وجرائد نے جہا ں کھتارسس کا کام...

The Region of Punjab: A Sufi Perspective With Particular Focus on Chishtiya Sufism

Medieval Punjab was amongst the first regions of South Asia to encounter the substantial impact of early Sufi mystics. This article aims to investigate the history of the Punjab from a Sufi perspective with particular focus on Chishtiya Sufism and its generous role in diverting the local community center of attention. For that, the prominent Chishti Sufi Dargahs of Baba Farid Ganj Shaker in Pakpattan is selected. The study tries to investigate Dargahs’ impact on the socio-cultural and religious set up of the Medieval Punjab. How did it influence another important religion of the region i.e. Sikh belief, paper tried to highlight this impact as well.

Ripple Free Torque Operation in Switched Reluctance Motors

This thesis investigates the control of current and torque at different speed of the switched reluctance motor observing the motor constructional properties, mathematical model equations, operating principle and power converter topologies. The switched reluctance motor has gained popularity in industry with the fact that it is simple to construct and suitable for harsh environment. The electromechanical energy conversion is produced from rather simple machine design than as it is done in conventional motors. The other advantages are its rugged construction, low maintenance cost, and ability to operate over a wide speed range at constant power. The merits of switched reluctance motors are marred by the requirement of expensive control and its innate torque ripple issue, which is also a cause of vibration and acoustic noise. Torque ripple is produced from successive excitation of phase currents. The current through phase windings produces magnetic force with tangential and radial components where former component contributes to the average torque production and the latter is the major cause of vibration and acoustic noise in switched reluctance motors. Torque ripple reduction leads to smooth operation, thus it also improves the vibration and acoustic noise. This reduction can be achieved either through better machine design or with superior control techniques. Better machine design involves basic design parameters like number of stator poles, rotor poles and also their shape which is generally determined using detailed magnetic analysis. In this piece of work literature review of both approaches is included but the latter current control approach is adopted for detailed research. This thesis also discusses the split stator winding technique to improve reduction in torque ripple. This is unique strategy to introduce a compensation torque and remarkable reduction in torque ripple. This technique requires the slight change in shape of stator. This technique has ability to eliminate the negative torque generation and also the starting problem in switched reluctance motors. The control techniques deal with the electronic part of complete drive systems. The torque and current are directly related to each other, so the torque control can be implied by current control methods. This dissertation discusses the new current control technique with efficient bipolar power converter for torque ripple mitigation control. This piece of work also elaborates the new unique strategy of split stator winding for torque ripple reduction. In this thesis motor mathematical model is simulated using new control strategy along with two power converter topologies, conventional asymmetric half bridge converter and proposed symmetric full bridge converter. In addition split stator winding technique is simulated with suggested bipolar drive to show the improvement in ripple reduction. The experimental setup is also included in this thesis, where specific motor is operated using complete drive system. The design and implementation of this drive system is discussed in detail. This drive system is capable to perform both conventional and bipolar operations. At the end, practical results and simulated results are acquired and compared. The effect of excitation and de-excitation angles on torque production is observed and simulated. Torque and current relationship is observed to conclude which drive is suitable for smooth torque operation and have better current control at different speeds. The apparent cost difference is also analyzed and it is found that full bridge drive is more suitable for general purpose solution in industry with bearable increase in cost.