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رام بابو سکسینہ

رام بابو سکسینہ
افسوس ہے دسمبر کے آخری ہفتہ میں جناب رام بابو سکسینہ کاحرکت قلب بند ہوجانے سے بحالت سفر اچانک انتقال ہوگیا۔ موصوف کو اردو زبان وادب کے ساتھ عشق تھااوروہ اس کا بڑا وسیع اورگہرا مطالعہ رکھتے تھے۔یہی وجہ ہے کہ ایک ذمہ دار سرکاری عہدہ کی چند درچند مصروفیتوں کے باوجود انھوں نے ادبِ اردو پرمتعدد ضخیم کتابیں اپنی یادگار چھوڑی ہیں۔ ان کی کتاب ’تاریخ ادبِ اردو‘ کو بڑی مقبولیت حاصل ہوئی، اس موضوع پر یہ کتاب اس پایہ کی ہے کہ ادبِ اردو کاکوئی طالب علم اس سے بے نیاز نہیں ہوسکتا۔اس کے علاوہ’’اردو کے انگریز شعرا‘‘ نامی کتاب انھوں نے بڑی تلاش وجستجواورمحنت سے مرتب کی تھی۔ایک کتاب حال میں ہی’’مرقع شعراء‘‘کے نام سے شائع ہوئی ہے۔سنا ہے کہ دو کتابوں کے مسودے ابھی اورباقی ہیں جو غیر مطبوعہ ہیں،موصوف اب دنیا میں نہیں لیکن اُن کے یہ شاندار ادبی کارنامے اُن کانام زندہ رکھیں گے۔
[جنوری۱۹۵۸ء]

 

History as Profession and as Political Capital

History comes to us from various agencies not just academics in schools and colleges; but diverse inputs to all those who haven’t studied history, like popular history, through cinema, poetry, folklore, myths, theatre; history has several modes of percolation to society. Also, a kind of history is propagated in an organised manner as is done by organisations as RSS which is a practical approach to history as differentiated from an academic approach to history; the former is more political than the latter though both come with an aspect of politics. History thus has much wider reach than what is taught in schools or colleges.

Theoretical Investigation of Liquid Chromatography in Cylindrical Columns

Liquid chromatography is one of the most widely used separation and puri¯cation tech- niques utilizing cylindrical columns. Generally, one-dimensional chromatographic models are used to study concentration gradients along the column axis only, while gradients along the radial direction are ignored. However, consideration of radial concentration gradients are necessary when sample injection at inlet of the column is imperfect, that is when a radial pro¯le is inserted at the column entrance, and radial dispersion is rate limiting. In such a scenario, the two-dimensional (2D) models of chromatography have to be consid-ered. This work focuses on the derivation of analytical solutions and temporal moments of linear 2D models of liquid chromatography in cylindrical geometry. In liquid chromatogra-phy, the injected sample size is small and diluted, thus, the current assumptions of linear adsorption and reaction in the models are valid and practically applicable. The models are formed by convection-dominated partial di®erential equations coupled with some algebraic and di®erential equations. Both non-reactive and reactive chromatographic models, two sets of boundary conditions, as well as injections through inner and outer regions of the column inlet cross section are considered. The Laplace and Hankel transformations are successively applied to solve the model equations. To further analyze the process, tempo-ral moments up to the fourth order are derived from the Hankel and Laplace transformed solutions. The correctness of analytical results are veri¯ed by comparing them with the numerical solutions of a high resolution ¯nite volume scheme. Results of di®erent test prob-lems are presented and discussed covering wide ranges of kinetics in°uencing mass transfer and reaction rates. The developed analytical solutions and moments provide useful tools to quantify combined longitudinal and radial dispersion e®ects, to perform sensitivity anal-ysis, to analyze numerical algorithms, as well as to understand, design and optimize the process.
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