پشتو نثر میں سیرت نگاری کا ایک علمی و تجزیاتی مطالعہ: منتخب کتب سیرت کی روشنی میں

Due to the significance of Sīrah, Muslim scholars started writing about it from the very beginning of Islam. Pashto language, like other major languages, contains the Sīrah writings. There are two types of Sīrah writings in Pashto language. The first type of books are written for a common man, in a very simple language and style, just to get guidance from the Sīrah of the Holy Prophet (P.B.U.H). This type of books were discussed by Dr. Sa’īdullah Qaḍī in his article “Sīrah books in Pashto Language” published in “Al-Ḥaq” Monthly Journal of Jami’a Dārul Uloom Ḥaqqānia, Akora Khattak. The second type of Sīrah books are written after deep research and criticism of the narrations. But it is worth mentioning that no comprehensive research has been carried out so far which can cover both types of books. Therefore an analysis of the Selected Sīrah writings in Pashto Language has been made, to explore the remarkable Sīrah writings in Pashto Language.

Transport and Gas Sensing Properties of Cadmium Titanate Nanofibers

In this work AC & DC transport and sensing properties of cadmium titanate (CdTiO3) nanofibers have been investigated. Study of AC transport properties were explored using temperature dependent impedance spectroscopy. DC transport measurements were carried out using temperature dependent current-voltage (I-V) characterization. Cadmium titanate/polyvinyl-pyrrolidone composite nanofibers were prepared using an electrospinning technique. When temperature increased from 600 °C to 1200 °C the phase changes in CdTiO3 nanofibers were observed. The nanofibers annealed at 600 °C had ilmenite phase with a very small amount of CdO. Pure ilmenite phase was obtained at 950 °C. Annealing at 1000 °C yielded pure perovskite phase. Further increase in annealing temperature resulted in rutile TiO2 phase. The average diameters of nanofibers annealed at 600 °C and 1000 °C were found to be ~150 nm and ~600 nm, respectively. The length of nanofibers was ~100 μm. Analysis of frequency dependent AC conductivity in ilmenite phase revealed correlated barrier hoping (CBH) conduction from 318 K – 498 K. In perovskite phase, thermally activated small polaron hopping (SPH) conduction played dominant role from 320 K – 420 K. In DC transport, Ohmic behavior was observed at low voltages followed by space charge limited current (SCLC) with traps at higher voltages at all temperatures (200 K – 420 K). Humidity sensing characteristics of ilmenite phase were investigated. Fast response time and recovery time of 4 seconds and 6 seconds was observed, respectively. The sensor was highly sensitive and showed a reversible response with small hysteresis of less than 7%. Long term stability of the sensor was confirmed during 30 days test. Oxygen sensing using ilmenite and perovskite phase CdTiO3 nanofibers was also performed. The gas response of the ilmenite nanofibers sensor to oxygen gas was twice as high as that of the perovskite phase. The response and recovery times were 120 seconds and 23 seconds, respectively for ilmenite phase, whereas response and recovery times were 156 seconds and 50 seconds, respectively for the perovskite phase. Better oxygen sensing characteristics of ilmenite phase were attributed to large surface area ~9.41 m2/g and porosity.