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محمد اسلم تاب

تاب(۱۹۲۹ء ) کا اصل نام محمد اسلم ہے۔ لیکن ان کی پہچان تابؔ اسلم کے نام سے ہے ۔آپ سیالکوٹ میں پیدا ہوئے۔ ۱۹۴۸ء میں محکمہ برقیات میں ملازم ہو گئے۔ ۱۹۴۹ء میں ان کی پہلی نظم ’’ادب لطیف‘‘میں مرزا ادیب نے شامل کی۔ تابؔ نے شاعری کا آغاز سکول کے زمانے سے ہی کر دیا تھا۔ مقامی ادبی تنظیموں اور مشاعروں میں باقاعدگی سے ایک سامع کی حیثیت سے شرکت کرتے تھے۔(۷۶۴)تابؔ کے ابتدائی کلام میں سادگی اور معصومیت نظر آتی ہے۔ ان کا شعری کلام ’’فردوس ادب‘‘، ’’اوراق‘‘،’’افکار‘‘،’’لیل و نہار‘‘،’’امروز‘‘، ’’مشرق‘‘،’’لاہور‘‘،’’رابطہ‘‘،’’کراچی‘‘،’’ادب لطیف‘‘،’’ادبی دنیا‘‘،’’ہمایوں‘‘،’’نیرنگ خیال‘‘،’’فنون‘‘، ’’ساقی‘‘کراچی اور ’’ید بیضا‘‘سیالکوٹ میں شائع ہوتارہا۔ تابؔ جگر مراد آبادی کے ساتھ سیالکوٹ کے مشاعروں میں شرکت کرتے تھے۔ ۱۹۶۰ء میں ’’بزمِ فکر و فن‘‘ ایک ادبی تنظیم کے تاب سیکرٹری مقرر ہوئے۔ ۱۹۶۴ء میں تابؔ نے سیالکوٹ میں ’’حلقہ اربابِ ذوق‘‘ نے نام سے ایک انجمن قائم کی جس کے کئی سال تابؔ سیکرٹری رہے۔(۷۶۵) تاب کا پہلا شعری مجموعہ ’’زخمِ وفا‘‘ ۱۹۷۲ء کو مکتبہ عالیہ لاہورنے شائع کیا۔ دوسرا شعری مجموعہ’’نقشِ آب‘‘ ۱۹۷۵ء کو مکتبہ عالیہ نے طبع کیا۔ تیسرا شعری مجموعہ ’’سراب جاں‘‘ بنگش بک ڈپو لاہور نے ۱۹۹۵ء میں شائع کیا۔ چوتھا شعری مجموعہ ’’تیرے یاد کے سارے موسم‘‘ الحمد پبلی کیشنز لاہور نے ۲۰۰۱ء میں طبع کیا۔ تابؔ اسلم کا پانچواں شعری مجموعہ’’درد تیرے فراق کے ‘‘ نام سے زیر تکمیل ہے۔

تاب نے۱۹۴۹ء میں اپنی شاعری کی ابتدا کی تو ان کی زیادہ توجہ نظم کی طرف تھی ۔انھوں نے کم وبیش ہر موضوع پر نظم تحریر کی۔ بعد میں ان کا غالب رجحان غزل کی طرف رہا۔ آج بھی وہ غزل لکھ رہے ہیں مگر کہیں کہیں نظم بھی لکھتے...

Analysis of Drivers’ Characteristics Concerning Speeding Behavior and Crash Involvement in Oman

This study aims to identify the significance of driver’s socioeconomic demographics (SEDs) in the decision to speed and crash involvement. A questionnaire was designed consisting of a driver’s SEDs, speeding propensity, and crash experience. This questionnaire was conducted with the students and employees of the University of Nizwa and other drivers at the selected locations. A total of 604 usable samples were obtained. Simple frequency distribution and discriminant multivariate analysis were conducted on the driver’s responses. Survey results revealed that about 47.7% of the drivers have experienced a crash. The driver’s gender nationality, profession, age, type of vehicle drive, driving experience, and past crash experience are significant attributes of the driver’s speeding behavior. Ordered probit analysis for speeding behavior and simple probit regression analysis for crash involvement was conducted. The male drivers and those who are under the age of 30 years and have driving experience of more than 3 years have more likelihood to exceed the speed limits than other drivers. Similarly, the driver’s gender, age (≤ 30 years), and those who are employees have a significant correlation with the propensity of crash involvement. Male and young drivers have more likelihood to be involved in a crash.

Linear and Nonlinear Dynamics of Pair Ion Plasmas

An analysis of waves and instabilities in pair-ion plasma produced in some recent experiments is presented. The pair-ions, C±60, have the same mass and opposite charge. It is pointed out that the observation of the electrostatic ion acoustic wave frequency can be a suitable check to determine whether the produced plasma is a pure pair-ion plasma or whether it comprises some concentration of electrons. Linear and nonlinear electrostatic waves are studied in an unmagnetized pure pair-ion (PI) and pair-ion–electron (PIE) plasmas. In this thesis, we primarily focus on the analytical and numerical study of linear and nonlinear waves in pair-ion and pair-ion-electron plasmas and in particular formation of three different types of nonlinear structures have been investigated. The shear flow-driven electrostatic instabilities has been investigated in ideal low-density, low-temperature pair-ion-electron and pure pair-ion plasmas in several different cases, by considering homogeneous and inhomogeneous density effects. In uniform pair-ionelectron plasma, when the shear flow is of the order of the acoustic speed, a purely growing D''Angelo mode can give rise to electrostatic fields. In the case of an inhomogeneous plasma, the drift wave becomes unstable. The presence of negative ions, however, reduces the growth rate. If the positive and negative ions are not in thermal equilibrium with each other, then the shear flow also gives rise to an electrostatic instability in pure pair-ion plasma. The Kortewege-de Vries-Burgers (KdV-B) equation is derived for drift-waves in a partially ionized non-uniform pair-ion-electron (PIE) plasma. The nonlinearity appears due to electron temperature gradient. The analytical solutions in the form of solitons, monotonic shocks and oscillatory shocks have been obtained. The numerical calculations have also been presented for PIE plasmas of fullerene and hydrogen for illustration keeping in view the recent experiments. The Kadomtsev-Petviashvili-Burgers (KPB) equation is also derived for coupled drift acoustic shock waves in a partially ionized non-uniform pair-ion-electron (PIE) plasma in the presence of both density and temperature gradients, respectively. Both linear and nonlinear studies have been presented. The nonlinear KPB equation is derived in the small amplitude approximation method and its solution is found using the tanh method. The numerical calculations have also been presented for PIE plasmas of fullerene plasma. The effect of density and temperature inhomogeneities on the nature of the shock is also highlighted. The role of the velocity of the nonlinear structure with regard to the density and temperature gradients driven drift velocities is also pointed out and the effect of ionneutral collision frequency is also investigated. The linear and nonlinear dynamics of pair-ion (PI) and pair-ion-electron plasmas (PIE) have been investigated in a cylindrical geometry with a sheared plasma flow along the axial direction having radial dependence. The coupled linear dispersion relation of lowfrequency electrostatic waves has been presented taking into account the Gaussian profile of density and linear gradient of sheared flow. It is pointed out that the quasi-neutral cold inhomogeneous pure pair ion plasma supports only the obliquely propagating convective cell mode. The linear dispersion relation of this mode has been solved using boundary conditions. The nonlinear structures in the form of vortices formed by different waves have been discussed for PI and PIE plasmas. Johnson''s equation which is also known as cylindrical Kadomstev-Petviashvili (CKP) equation, is derived for pair-ion-electron plasmas to study the propagation and interaction of two solitons. Using a novel gauge transformation, two soliton solutions of CKP equation are analytically solved by using the Hirota''s method. Interestingly, it is observed that unlike the planar Kadomstev-Petviashvili (KP) equation, the CKP equation admits horseshoe-like solitary structures. Another non-trivial feature of CKP solitary solution is that the interaction parameter gets modified by the plasma parameters on contrary to the one obtained for Korteweg de Vries (KdV) type equation.
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