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۔طاہر وحید

چلو.....پھر"

چلو اب "عرصہء ہجرت" میں مدت لے کے آئیں...

چلو گھر لوٹ جائیں،

چلو بارش کو رنج-رائیگانی سے بچائیں...!

چلو ہم بھیگ آئیں،

چلو پیروں سے لپٹے راستوں کو پائمالی سے بچائیں...!

چلو منزل کو اب گھر لے کے آئیں،

چلو منظر کی ویرانی سے آنکھوں کو بچائیں...!

چلو خوابوں کو ان میں لا بٹھائیں،

چلو آئینے کو بے چہرہ لوگوں کی رفاقت سے چھڑائیں...!

چلو ہم خود کو اس کے روبرو لائیں،

چلو اب منجمد رشتوں کو تجدیدِ تعلق سے جگائیں...!

چلو "دل اوک" میں جذبوں کی تھوڑی دھوپ بھر لائیں،

چلو کم مائیگی میں مبتلا لفظوں کی قسمت جگمگائیں...!

چلو ان میں تمہارا "نام" رکھ آئیں،

چلو پھر عشرتِ ابر-رواں سے حظ اٹھائیں...!

چلو پھر حسرت-کوزہ گراں کو آزمائیں،

چلو اپنی دعا کو نارسائی کی اذیت سے بچائیں...!

چلو باب-دعا "خود" کھول آئیں،



 

ترجيحات الشيخ ثناء الله بانی بتی في تفسير سورة الفاتحة: دراسة تطبيقية نموذجية

The topic of this research is “Preferences of Qazi Sana Ullah Pani patti in Tafseer of Surah al Fatiha, and these preferences are taken from his famous book of tafseer, named: “Tafseer al Mazhari.  Qazi Sana Ullah Pani Patti is one of the most eminent scholars of Tafseer in sub-continent. He belongs to the progeny of Usman R.A. He was born in PaniPat and got his early education there. Then he travelled to Dehli for higher education of that time. His teachers include: Abdul Raheem al Umari al Dehlvi, Muhammad Abid al Sinami, Sheikh janjan al Dehlvi. Among his famous books are followings: Al Tafseer al Mazhari, Mabsoot, Al saif al Maslool, Irshad ul Talibeen, Tazkira tul Mota, Haqeeqa tul Islam, and many other books. In this research I will discuss preferences of Qazi Sana Ullah with reference to two major types of Tafeer i.e Tafseer bil riwayyah (narration) and Tafseer bil dirayyah (sound reasoning).  

Sliding Mode Framework Based Fault Tolerant Control for Air Path Actuators of a Turbocharged Diesel Engine

Exhaust emission control, especially in case of diesel engines, is a challenging re search problem as the emission regulating authorities place stringent protocols against emissions. The air management system of a diesel engine, that is fit ted with Variable Geometry Turbocharger (VGT) and Exhaust Gas Recirculation (EGR) actuators, is among the sub-systems, whose effective control ensures that emissions are kept to minimum. Both EGR and VGT sub-systems are located in the engine exhaust channel, hence, they are strongly coupled and exposed to high temperatures, un-burnt hydrocarbons and lubricants and thus prone to faults/cho king. One way to increase tolerance against faults is to have redundancy. Diesel engines do not have high number of identical actuators to preserve satisfactory operation, but, still have prospects for enhancing the reliability of these control loops by constructing algorithms, that are capable of performing online detection, diagnosis, estimation and compensation of faults. This research investigates the possible options for development of Fault Tolerant Control (FTC) schemes for coordinated control of air management system actuators of diesel engine. The dynamic nature of a control system and real time environment of Fault Detection and Isolation (FDI) and controller re-configuration requires FTC system to be capable of detecting, identifying and accommodating the faults as swiftly as pos sible. To meet the purpose, unified and systematic design techniques need to be developed to guarantee swift integration of FDI and FTC schemes, such that, the faults are handled in an early design phase by extending the control system with additional modules, i.e., FDI module. The model used in this research is a fully validated industrial scale Mean Value Model of a diesel engine that is equipped with VGT and EGR actuators. It has eight states and three control inputs. Two types of approaches i.e., passive FTC and unified FDI and FTC with further two algorithms of each have been proposed based on the sliding mode framework. The simulation results have shown that the proposed controllers can comfortably meet strict emission regulations even in the event of system faults. Specially fault de tection, estimation and compensation capability of unified approaches give them an edge over passive schemes.
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