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Efg and Magnetic Studies of Actinide-Post Transition Metals

Thesis Info

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Author

Khan, Sajid

Program

PhD

Institute

University of Malakand

City

Malakand

Province

KPK

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/11165/1/Sajid%20Khan_Phy_2018_Malakand_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726041137

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In this thesis, we explore the structural and magnetic properties as well as electric field gradient (EFG), hyperfine field (HFF) and quadrupole coupling constant in actinide digallides AcGa2 (Ac=U, Np, Pu), NpPx3 (Px =Al, In, Ga) and UX3 (X =In, Tl, Pb) by using local density approximation (LDA), generalized gradient approximation (GGA) with onsite Hubbard potentials LDA+U and GGA+U and Hybrid Wu-Cohen GGA (HF-WC). The hexagonal AB2 type AcGa2 and cubic AuCu3 type NpPx3 as well as UX3 compounds are optimized. The lattice constants, bulk moduli, optimized volumes and ground state energies of these compounds are evaluated from the optimized structures. Our results show that the calculated values of these structural parameters are consistent with the available experimental results. The magnetic structures of the materials under study are investigated by calculating the ferromagnetic, antiferromagnetic and non magnetic phase energies. The UGa2, NpGa2 and NpPx3 have lowest energies in ferromagnetic phase while PuGa2 and UX3 prefer in antiferromagnetic phase, which is in agreement with the experimental results. Due to the 5f- electronic states in these compounds spin orbit coupling (SOC) effect has been considered to include. The spin, orbital and total magnetic moment at U, Np and Pu sites have been calculated computationally with the presence and absence of SOC. Our calculated magnetic moments at uranium, neptunium and plutonium sites are consistent with the experimental values. The orbital, dipolar, Fermi contact as well as total hyperfine and its origin in actinide as well as post transition atomic sites have been investigated for the first time in these compounds. The EFG and quadrupole coupling constant of uranium, neptunium and plutonium atom have been calculated and discussed in detail. These properties are mainly originated from f- states at uranium sites while p- states at post transition sites.
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عبدالرحمن خان نشتر ؔ

عبدالرحمن خان نشترؔ
جناب عبدالرحمن خان نشتر کی وفات نے پورے اترپردیش کو سوگوار بنادیا ہے، وہ اس صوبہ کے ایک مقبول اور ہر دلعزیز لیڈر تھے، ان پر دو بار دل کی بیماری کا حملہ ہوچکا تھا، ۷؍ اکتوبر کو بریلی کے ایک مشاعرہ میں نعتیہ کلام سماعت فرما رہے تھے کہ پھر حملہ ہوا اور جاں بحق ہوگئے، اِناﷲِ وَ اِنا اِلَیہ رَاجِعُون، انھوں نے پہلے کان پور میں تجارت شروع کی، پھر قوم و وطن کی خدمت کے لیے اپنی زندگی وقف کردی وہ کانگریس پارٹی کے سرگرم اور مخلص کارکن تھے، مختلف تنظیمی عہدوں پر فائز رہنے کے علاوہ وزیر بھی رہے، اقلیتوں کے مسائل اور قومی یکجہتی کے پروگرام سے دلچسپی کی بناء پر کانگریس کے اقلیتی سیل کے صدر اور ریاستی قومی یکجہتی کونسل کے نائب صدر مقرر کیے گئے، جو بھی عہدہ اور ذمہ داری انھیں سپرد کی جاتی، اسے محنت، قابلیت اور دیانت داری سے انجام دیتے اور نیک نامی حاصل کرتے۔
نشتر صاحب ایک خوش عقیدہ مسلمان اور بزرگان دین کے بڑے متعقد تھے، مزاروں پر بھی حاضری دیتے، صوم و صلوٰۃ کے پابند تھے، تلاوت قرآن میں ناغہ نہ کرتے، حج کا فریضہ بھی ادا کیا تھا، گزشتہ سال لکھنو کی تقدس حج کانفرنس کا افتتاح کرتے ہوئے انھوں نے جو پرمغز اور دلنشین تقریر کی اس سے لوگ بہت متاثر ہوئے، اس سے ان کی گہری مذہبیت کا بھی اندازہ ہوا، مسلمانوں کے مخصوص مسائل سے بھی دلچسپی لیتے اور اس کے لیے جرأت و بے باکی سے آواز بلند کرتے، وہ اپنی نیکی، شرافت، وضعداری اور انسانیت دوستی کی وجہ سے ہر طبقہ میں مقبول تھے، دوسروں کی مدد کرکے خوش ہوتے، بڑے عہدوں پر فائر ہونے کے باوجود عوام سے بھی برابر رابطہ قائم رکھتے، راقم سے ملاقات ہوتی تو بڑے تپاک سے ملتے...

عہد نبوی میں نوجوان صحابہ کرام کا بطور معلم تقرر اور اصلاح معاشرہ میں ان کا کردار

It is above-board that teachers play an important role in forming, formulating, molding and developing the society as individuals and as a whole. The youth has ever been an icon to lead the community in every sphere of life. The young stuff has played the pivotal role in preaching, scribing, teaching, political, economic and even diplomatic fields. The present research article explores the role of various companions of Holy Prophet (r) in these fields. Firstly, the Holy Prophet (r) groomed his companions, stormed their brains and paved them on the Divine way, then sent them to the said fields to work. Among those companions, Ḥaḍrat Muṣ‘ab bin ‘Umayr, Mu‘ādh bin Jabal, ‘Abdullāh ibn e Maktūm, Rāfi‘ bin Mālik, ‘Abdullāh ibn e Mas‘ūd, ‘Abdullāh ibn e ‘Abbās, Abū Sa‘īd Khudrī (y) as well as from females Ḥaḍrat ‘Āyshah, Ḥaḍrat Ḥafṣah, Shifā bint-e-‘Abdullah etc. Were appointed as preachers. Their task was not only to teach and educate the community rather to present themselves before them as paragon for their particular fields. The research concludes that the Prophet (r) laid down a criteria for selection of the teachers of Muslim Ummah. The selection criteria of the Prophet (r) was based not only on contingent variables but also on some special characteristics like teaching and training, potential empathy for the learners and a passion for social reformation. As a result, these preachers, after practicing their ideal and best performance, produced numerous educations, merchants, facilitators and reformers in the society. The present research paper will explore the companions’ efforts for the reformation of the society.

Role of Financial and Operating Leverage in Firms? Profitability During Pre & Post 2008 Financial Crisis: An Investigation from Chemical Sector of Pakistan

This study investigates the role of financial and operating leverages in firms? profitability before and after financial recession/crisis of 2008 focusing on chemical sector firms listed on the Pakistan Stock Exchange (PSX). The period of study selected is from 2004 to 2015. The ROE is taken as dependent variable. The Financial Leverage (FL) and Operating Leverage (OL) are chosen as independent variables or predictors. Three other variables like Assets Utilization (AU), Non-Debt Tax Shield (NDTS) and Age have been introduced as control variables. Another variable named Pre/Post is introduced as a dummy variable for the indication of pre and post financial crisis 2008. A population of all 43 firms listed on PSX is selected. The 29 chosen firms relate to the chemical sector directly whereas 14 firms are indirectly related to the chemical industry.The data used in the analysis has been gathered from secondary sources i.e. from the SBP?s publications. The regression model used is panel linear model (PLM). The unbalanced data panel has been used in the analysis. Similarly, the random effect approach has been applied.The Stata statistical software has been used to estimate the relationship between predicted/dependent and predictor/independent variables. Following outcomes have been accomplished after the examination; the FL has a negative but significant relationship with the firm?s profitability whereas the OL has a positive but non-significant relationship with the firm?s profitability. The AU has shown a positive and significant relationship with the firm?s profitability. Whereas other predictors like Age, NTDS have proved a positive but non-significant relationship with the firm?s ?ROE?. Both types of leverages have shown a negative impact on the firm?s profitability after the global financial crisis in 2008. Keywords: Profitability, Financial leverage, Operating leverage, Assets Utilization, Age, non-debt tax shield, Financial Recession/Crisis 2008 and Pre/Post.