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تاریخی و سیاسی تناظر

سر زمینِ سیالکوٹ صدیوں کی انسانی تہذیب و تمدن ،ادب و ثقافت اور فنونِ لطیفہ کا عظیم الشان گہوارہ ہے۔اس دھرتی کے تاریخی آثار ایک طویل مدت سے مورخین و ماہرین آثارِ قدیمہ کی دلچسپی کا سامان رہے ہیں۔اب بھی اس کی عظمت رفتہ کے قصے اہلِ تحقیق کو ورطۂ حیرت میں ڈالے ہوئے ہیں۔سیالکوٹ بہت قدیم شہر ہے۔اطہر سلیمی اس کی قدامت کے حوالے سے لکھتے ہیں:

سیالکوٹ کی تہذیب ٹیکسلا او رموہنجو ڈارو کی تہذیبوں کے ہم پلہ ہے۔(۲۴)

          اس عظیم شہر کے رخ سے اگر ماضی کی تاریخ کے گہرے پردے کاٹے جائیں تو ہمیں اس کی تاریخی عظمتوں کا اعتراف کرنا پڑے گا۔سیالکوٹ نے قدیم شہر ہونے کی وجہ سے سینکڑوں روشن اورتاریک رخ دیکھے ہیں۔اس شہر کے سینے میں ہندوراجاؤں ،تاتاریوں اور مغلوں کے تاریخی افسانے پوشیدہ ہیں۔اس کے ذرے ذرے میں ہزاروں ہنگامے پنہاں ہیں۔سیالکوٹ کی ابتدائی تاریخ کی ورق گردانی کرنے پر سب سے پہلے ’’مہابھارات‘‘میں ہمیں اس کا ذکر ملتا ہے۔تقریباً پانچ ہزار سال قبل صوبہ پنجاب کے بہادر راجہ پانڈو خان کے بھتیجے راجہ سل نے اس شہر کو تعمیر کروایا تھا۔یہیں اس نے ایک قلعہ بھی بنوایا اور اپنے ہی نام پر اس کا نام سلکوٹ رکھا۔(۲۵)یعنی سل کا قلعہ جو بعد میں بگڑ کر سیالکوٹ کے نام سے مشہور ہوا ۔اس ضمن میں آتش لدھیانوی رقمطراز ہیں:

یہ راجہ سیاذات کا تھا۔ کہتے ہیں کہ اپنی ذات کی نسبت سے اس جگہ کا نام سیالکوٹ رکھا۔(۲۶)

          جیسا کہ اوپر ذکر ہوا ہے کہ اس شہر کا ذکر ہندوؤں کی مذہبی کتب ’’مہابھارت‘‘ اور’’یران ‘‘ میں بھی آیا ہے۔محمد دین فوق نے بھی اس سلسلے میں لکھا ہے:

اس زمانے میں سیالکوٹ کانام شاکل...

تابعین كے اجماع مركب كی شرعی حیثیت

Consensus of opinions of religious scholars of Muslim Ummah in any era is the legal instrument to validate admissibility or inadmissibility of something in Shariah. The consensus is categorized into different types on the basis of its dimensions, attributes and modes. Compound Consensus is the type of consensus that is the bunch of contradictory judgments of Muslim Scholars of the era of companions of the Prophet s.a.w. And their disciples by accepting it as Shariah source. There is difference of opinion among Muslim scholars to believe it as a valid source to authenticate Shariah injunctions and commandments. Especially the scholars are divided into two groups on the authenticity of compound consensus of the disciples of the companions of the Prophet s.a.w. The article deals with different discussions about compound consensus of in principle and of the disciples of the companions of the Prophet s.a.w, its significance and validity, and misperceptions about its validity. After discussion, it seems better to consider compound consensus as an acceptable argument. The article has been written in analytical mode.

Optimization of Surface Finish by Considering the Effect of Vibration in Machining Operations

Optimization of surface roughness has been one of the primary objectives in most of the machining operations. Poor control on the desired surface roughness generates non conforming parts and results in increase in cost and loss of productivity due to rework or scrap. Surface roughness value is a result of several process variables among which vibration is of great significant. In this study, experimentation was carried out to investigate the effect of vibrations, forced and self excited, on surface roughness. For forced vibration, variable used to represent machine tool’s condition was vibration amplitude. Input parameters used, besides vibration amplitude, were feed rate and insert nose radius. Cutting speed and depth of cut were kept constant. Based on Taguchi orthogonal array, a series of experimentation was designed and performed on AISI 1040 carbon steel bar at default and induced machine tool’s vibration amplitudes in external turning operation. Analysis of variance, ANOVA, revealed that vibration amplitude and feed rate had moderate effect on the surface roughness and insert nose radius had the highest significant effect on the surface roughness. It was also found that a machine tool with low vibration amplitude produced lower surface roughness. Insert with larger nose radius produced lower surface roughness at low feed rate. The optimum conditions obtained through Taguchi were found in reasonable agreerment to those obtained with full factorial design through Genetic Algorithm. Department of Industrial and Manufacturing Engineering Secondly, experiments related to self excited vibration in internal turning operation were selected. Taguchi method was employed to minimize the surface roughness by investigating the rake angle effect in boring performed on a CNC lathe. The control parameters included, in addition to rake angle, were insert nose radius, cutting speed, depth of cut, and feed rate. Slight tool wear was taken as a noise factor. Based on Taguchi Orthogonal Array L18, a series of experiments were designed and performed on AISI 1018 steel. It was found that tool with a high positive rake angle and smaller insert nose radius produced lower surface roughness value due to low cutting forces generated. It was also revealed that high feed rate and low cutting speed has produced the lowest surface roughness. Key words: turning; optimization; Taguchi; surface roughness; vibration amplitude, ANOVA
Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

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