Discrete Multitone (DMT) modulation is a popular multicarrier technique adopted for wireline communication, which offers computationally inexpensive channel equalization, based on cyclic prefix, in addition to bit and power loading. A cyclic prefix is pre-appended in multicarrier modulated (MCM) techniques, that helps mitigate the inter-symbol interference due to mul- tipath effect. For channel equalization, a single tap per subcarrier is sufficient to compensate for the channel distortion in the frequency domain, provided the cyclic prefix length is of the order of the channel. This formulates a Zero-Forcing frequency domain equalizer, which com- pensates the channel attenuation with an inverse channel response. However, this method has the shortcoming of enhancing channel noise, where the channel is of low magnitude, in the high frequency range. It has been observed through the studies on channel measurements that most channels display the characteristics similar to that of a lowpass filter. Therefore, the cyclic prefix (CP) based equalization in MCM techniques enhances channel noise, which in turn increases the bit error rate and also reduces the post equalization signal-to-noise ratio (SNR). In this thesis, as a solution to this problem, hybrid DMT modulation techniques, that is the Uniform and Non-Uniform DMT modulation are proposed and implemented for the DSL and the power line channels. The performance analysis of the proposed modulation techniques in the DSL channel and for the various categories of the power line channel is presented. Since the Non-Uniform and Uniform modulation techniques are hybrid techniques, and their structures are a combination of wavelet filter banks and conventional DMT systems, therefore, the effect of inter-channel crosstalk and its relation with the filter’s order is also investigated. Computational complexity of the hybrid modulation techniques is also derived, and it is found to be greater than that of the conventional DMT system. Moreover, different methods are adopted for quantization of channel noise enhancement. A reconstruction error is derived to ascertain the quantity of channel noise enhancement in different subbands of the communication channel and also for this purpose, post equalization SNR is computed. A modified Non-Uniform DMT transceiver was proposed and implemented for the DSL channel. It is depicted through simulation results that the Non- Uniform DMT modulation shows some improvement in the post equalization SNR, and its modified form gives better performance, however at the cost of reduced data rate. The Uniform DMT modulation technique is proposed with a power-allocation algorithm for different sub- channels of the DSL and the power line channels. The Uniform DMT modulation performance evaluation through simulation results shows significant improvement in SNR in comparison with the conventional DMT system, at the cost of greater computational complexity, for the various DSL and power line channels.
آہ ! مولانا عثمان احمد قاسمی چل بسے ۴؍ رمضان المبارک ۱۴۱۸ھ کو راقم الحروف کے ایک کرم فرما اور دارالمصنفین کے ہمدرد مولانا عثمان احمد قاسمی اﷲ کو پیارے ہوگئے، اس کی اطلاع موصوف کے حقیقی بھانجے ڈاکٹر محمد اسامہ کے ایک خط سے ہوئی جو انتقال کے دو ہفتے بعد ملا، یہ خبر سخت تکلیف دہ تھی اور جنازہ کی شرکت سے محرومی کا تو ہمیشہ ملال رہے گا۔ شاہ گنج اور جونپور کے وسط میں پختہ سڑک کے قریب ہی غوری النسل لوگوں کی مشہور بستی پسری ان کا آبائی وطن تھا۔ ان کے جدامجد حضرت سلطان شاہ، ٹانڈہ کے مشہور صاحبِ دل بزرگ حضرت چاند شاہ کے اجل خلفاء میں تھے جو نقشبندی سلسلے سے منسلک تھے اور فیض آباد ہی نہیں اعظم گڑھ، جونپور اور سلطانپور وغیرہ کے لوگوں کو بھی ان سے بڑا فیض پہنچا۔ پسری کا یہ خاندان علمی، دینی اور دنیاوی لحاظ سے فائق تھا۔ مولانا عثمان احمد قاسمی کے جدبزرگوار کے حسبِ ذیل تین صاحبزادے تھے، مولانا عبدلغفور صاحب، مولانا دین محمد صاحب، مولانا شاہ سعید احمد صاحب، موخرالذکر کے پانچوں بیٹے دینی تعلیم سے بہرہ ور ہوئے، ان میں بڑے مولانا جمیل احمد فخرِ خاندان تھے اور سب سے چھوٹے یہی مولانا عثمان احمد تھے، مولانا دین محمد صاحب بھی عالم، اچھے استاد اور نہایت باغ و بہار شخص تھے، یہ مولانا ابوالعرفان ندوی سابق مہتمم دارالعلوم ندوۃالعلماء کے پدر بزرگوار تھے، علم و دین کی اشاعت ان کی زندگی کا خاص مشغلہ تھا، جونپور کی اٹالہ مسجد کا مدرسہ ان کے اہتمام کے زمانے میں بڑی رونق پر تھا۔ مولانا دین محمد صاحب کی جدوجہد سے شاہ گنج کی جامع مسجد میں بھی ایک دینی مدرسہ بدرالاسلام کے نام سے قائم ہوا، جس کے وہی سارے انتظامات اور تعلیمی خدمات انجام دیتے رہے مگر جب...
A review and comparative analysis of the intellectual pursuit, methods, approaches and publications of Imam Bukhari and Imam Muslim In his compilations of hadith, Imam Bukhari was considerate of the view point (or school of thought) of his prior narrators/authors of hadith collections and in doing so, he validated and embellished their (past narrators) publications. Similarly, narrators after Imam Bukhari benefited from his intellectual vigour, as evident in the work of Imam Muslim, who as Imam Bukhari’s student profited from his work, and compiled a treasure of validated hadiths. This body of work had deep influence on the contemporary and upcoming authors and collectors of hadith, as a source of religious knowledge. Since, Imam Muslim didn’t/couldn’t perform the compilation/ Codification / arrangement of his collected hadith, which was later on performed by Imam Novi, who was intellectually and academically influenced by the Imam Bukhari’s publications – hence, a great deal of semblance is evident in both the authors (Imam Bukhari and Muslim) publications. This is especially visible in certain aspects such as prescribing translation chapters (tarjumatul-baab) with the Quranic verses and hadith scripts. Similarly, Codification chapters for explanatory (questioning) notions is also common method practiced in both the author’s work. However, on the other hand, the publication of both the author’s differ in certain dimensions as well. For example, Imam Bukhari’s publications incorporates a complexity of thought, legalistic determination (Fiqh) and collective scholarly wisdom (ijtihad). Whereas, Imam Muslim’s work pursues a relatively simplistic and comprehensible format. In this article, we seek to review and present a comparative analysis of the intellectual pursuit, approach and publications of both the aforementioned authors.
A series of experiments were conducted to determine the ability of different chemicals and plant extracts to induce resistance in chickpea plant against A. rabiei disease in the Department of Plant Pathology, University of Agriculture, Faisalabad, Pakistan. Firstly two hundred and seventy seven advanced lines/cultivars of chickpea obtained from various International and Indigenous Organizations were screened during the Rabi season 2005-06 for the source of resistance against chickpea blight disease by artificial inoculation of the germplasm with pycniosspore suspension of the pathogen. The screening revealed 02, 38, 39, 49 and 149 lines/cultivars to be highly resistant (immune), resistant, moderately resistant, susceptible and highly susceptible while in the next experiments 49 susceptible lines/cultivars were sown for the purpose of induction of resistance in high yielding lines/cultivars by comparing their yield potential under disease free and artificially inoculated The results revealed that the three chickpea cultivars C-44 with (575 kg h -1 ), Bittle-98 (543.75 kg h -1 ) and Pb-91 (533.50 kg h -1 ) gave highest yield under disease free as well as under artificially inoculated conditions with yield (144.6 kg h -1 ), (132.8 kg h -1 ) (111.2 kg h -1 ) of C-44, Bittle-98, and Pb-91 respectively. Upon induction of resistance by chemicals i.e. salicylic acid, Bion ® , KOH and plant extracts i.e. Azadirachta indica, Datura metel and Allium sativum revealed that significant disease reduction (79%) was provided by Bion ® in the cultivar C-44 at 1.2mM dose rate as compared to salicylic acid, however, the least was showed by KOH. Among the plant extracts the maximum disease reduction (43.5%) against the disease was observed by the application of Azadirachta indica leaf extract while Datura metel and Allium sativum did not prove effective in reducing the disease at the same time this resistance was remained persistent for 14 days. The analysis of mineral contents of induced un-inoculated and induced inoculated chickpea plants after seven and fourteen days revealed there were increased after the induction of resistance but this increase was more significant (P ≤ 0.05) upon inoculation with the pathogen after 14 th day time interval by the application of chemical but it was not significant in case of plant extract expect neem. Only Na content was decreased in Bion applied plant in the cultivar C-44 and Pb-98 further more Cu content was also decreased in salicylic acid, Bion and neem leaf extract treated plants in the cultivar C-44. The amino acids contents were also determined of both the induced un-inoculated and induced inoculated chickpea plants showed that the quantity of methionine, isolucine, tyrosine and phenylalanine content increased after induction and inoculation in three cultivars of chickpea and comparatively higher than induced un-inoculated plants. Increase in lysine content was more in C-44 upon inoculation in case of Bion and salicylic acid treatment but it decreased in Bittle-98. Arginine and aspartic acid contents also increased in all the cultivars expect in Bittle-98, however, aspartic acid content increased in case of garlic application. Variable response was also shown by threonine content by the application of chemicals and inoculation with pathogen in all the cultivars. Serine contents decreased in KOH, neem and datura extracts application in Bittle-98. Glutamic acid show variable response while proline decreased in C-44 and Bittle-98 after application of garlic extract. Glycine content decreased in Bittle-98 otherwise it increased in all the other cultivars. Garlic application showed decrease in alanine content in Pb-91 and Bittle-98.