اقبال سہیلؔ
افسوس ہے کہ گزشتہ مہینہ اقبال سہیلؔ بھی چل بسے ۔وہ مسلم یونیورسٹی علی گڑھ کے باقیاتِ صالحات اور اُس عہد کی دیرینہ روایات کے حاملین میں سے تھے۔غیر معمولی ذہین وذکی تھے ۔فارسی اور اردو دونوں زبانوں کے بلند پایہ شاعر تھے۔ وہ اگر وکیل نہ ہوتے یامزاج لااُبالی نہ ہوتا توعلم وادب کے میدان میں ان کی شہ سواری کا مقابلہ بہت کم لوگ کرسکتے تھے ۔طبیعت حددرجہ دقیقہ رس اور دماغ بڑا نکتہ آفریں پایاتھا۔ نغز گوئی کے ساتھ اشعار میں روانی غضَب کی ہوتی تھی۔ غزلوں اور نظموں کے علاوہ انھوں نے جو نعتیہ نظمیں لکھی ہیں وہ بھی بڑے معرکہ کی ہیں، نثر بھی بہت اچھی لکھتے تھے ۔اگر کوئی صاحب اُن کے مضامین ِ نثر و نظم کو مرتب کرکے یک جا شائع کردیں تویہ اردو ادب کی مفید اورلائقِ قدر خدمت ہوگی۔ورنہ ان ادبی جواہر پاروں کے ضائع ہوجانے کا اندیشہ ہے ۔حق تعالیٰ مغفرت وبخشش کے فضل ِ خاص سے نوازے ۔ [دسمبر۱۹۵۵ء]
Growth factors are the potential operational members which control different phases of liver regeneration. Different growth factors have expression regulation in the whole process relating to different phases of liver regeneration. Objective: To assess the expression regulation of different growth factors and cytokines involved in liver regeneration in a phase-dependent manner. Methods: Blood and liver samples were collected and analyzed on 1st, 3rd, 5th, 7th and 14th postoperative days after 50% Partia hepatectomy (PHx). Results: Steady increase of liver regeneration rate was recorded from 90.8% (1st day) to 97.9% (7th day). Liver function tests further confirmed the steady liver recovery in PHx mice. Several growth factors such as HGF and VEGF exhibited an up-regulation till 5th day and later gradual decrease till 14th day compared to control mice. Albumin, CK18 and CK19 showed sequential expression increase from 1st to 14th day compared to AFP and HNF-4α upregulated until 5th and 1st day, respectively. Quantification of these growth factors further confirm our results. Conclusions: Conclusively, these results highlight a phase-dependent regulation and role of growth factors in liver regeneration and recovery
Frequency diverse array (FDA) radars have gained exceptional attention from the researchers during the past decade, due to their unique range-angle and time modulated beampatterns. This range–angle dependent beampattern provides additional degrees of freedom in the spatial domain as compared to a conventional phased array radar that offers only an angle dependent beampattern. The range-angle- time dependent beampattern with the aid of advanced signal processing algorithms, has been exploited for interference suppression, beamforming, direction of arrival estimation, target tracking, and localization in radar environments. In this dissertation, utilizing the extra degrees of freedom in FDA, new beamforming schemes have been proposed. In linear frequency diverse array radars (LFDA), null steering in cognitive radar system has been proposed. This work is a ‘near to implementable form’ of cognitive radar system that offers a null steering solution both in range and angle dimensions. Similarly frequency offset selection based 3D adaptive transmit beamforming has been proposed for planar frequency diverse array radars (PFDA). The proposed scheme outsmarts other existing techniques in terms of concentrated maxima, deeper nulls and enhanced system signal to interference plus noise ratio (SINR). Previous researches have focused largely on evaluating FDA system performance in uniform linear array (ULA) and uniform rectangular arrays. Despite the advantages and implementation convenience of other array geometries, they have not been extensively investigated. In this thesis, new geometries like “circular” and “elliptical” have also been explored in the domain of frequency diversity. Normally, 3D localization of targets can be achieved with PFDA, but investigation in this dissertation validates that uniform circular frequency diverse array (UCFDA) offers much sharper localization, improved directivity and better adaptive beamforming performance as compared to PFDA. Despite the fact that UCFDA offers much improved beamforming performance and signal to interference plus noise ratio than PFDA, circular geometry is a high side lobe geometry. Investigation into elliptical frequency diverse arrays (EFDA) reveals that, much better range selectivity and reduced side lobe levels can be achieved. Extending the domain of frequency diversity further, the thesis also focuses on UCFDA and EFDA with non-uniform frequency offset. The non-uniform function selected for this purpose is tangent hyperbolic function. The proposed systems not only offers a highly configurable type array system but also outsmarts the existing non-uniform frequency offset scheme in terms of significantly reduced side lobe levels.