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Home > Theoretically Computed Ir and Raman Spectra of Cyclohexane and Some Derivatives Using Gamess [Ms Chemistry]

Theoretically Computed Ir and Raman Spectra of Cyclohexane and Some Derivatives Using Gamess [Ms Chemistry]

Thesis Info

Author

Iqra Sharif

Department

UMT. School of Science. Department of Chemistry

Program

MS

Institute

University of Management and Technology

Institute Type

Private

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Page

61 .

Subject

Chemistry

Language

English

Other

School of Science; English; Call No: TP 543.08583 IQR-T

Added

2021-02-17 19:49:13

Modified

2023-01-06 19:20:37

ARI ID

1676714076958

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غزل

ہفت افلاک کا عنوان ہوا کرتا تھا : جب ستارہ مر ا ذیشان ہوا کرتا تھا

چین اس کو بھی گھڑی بھر کو میسر نہیں تھا : اُن دنوں میں بھی پریشان ہوا کرتا تھا

اُن دنوں دھول تھی اتنی نہ دھؤاں پھیلا تھا : دیکھ لینا تجھے آسان ہوا کرتا تھا

خال و خد حسن کا معیار بڑھا دیتے ہیں : میں اُسے دیکھ کے حیران ہوا کرتا تھا

پھر کسی نے دلِ ویران کا در باز کیا : یہ علاقہ تو بیابان ہوا کرتا تھا

ہے کوئی اُس سا حسیں شخص تو آگے آئے

پورے کیمپس میں یہ اعلان ہوا کرتا تھا

٭

آج محفل میں اسے دیکھ کے یاد آئی بہت

داستاں چاند کی جو ہم نے سنی نانی سے

اس ستم گر سے مجھے زخم ملیں گے جتنے

وہ منالے گا مجھے اتنی ہی آسانی سے

جب سے آئے ہیں خریدار چراغوں کے  نوید

تیرگی بڑھنے لگی شہر  میں تابانی سے

 

الترجمة والعولمة: دراسة تحليلية

The purpose of this research paper is to identify the relationship between Globalization and Translation, and to discuss the impact of Globalization on Translation. Globalization has different meanings to different scholars but the common theme that may be derived from different definitions is to make global or worldwide in scope or application. Keeping in view the context of Translation Studies (TS) it is mentioned that Globalization means “to make source texts global or worldwide in understanding or application, where application refers to the teaching and/ learning about different cultures” This paper also indicates to various kinds of globalization. However the impact of Globalization on Translation was highlighted to make the point that globalization does not only impact on translation, but it has impact on the lives of translators and their jobs in addition to language translation services in various fields of translation including media, medical and legal field. It formulates an attempt to understand the significance of translation in a global context. The conclusion answered the question: Is globalization has positive and negative impact on translation?

Tailoring of Polyimide Properties by Structural Modifications, Copolymerization and Nanocomposites Synthesis

Aromatic polyimides are materials of scientific and commercial interest due to their high thermal stability, excellent mechanical strength and stiffness at elevated temperatures, chemicals and radiation resistance etc. Owing to such worthy combination of aforementioned properties, these polymers have broad spectrum of applications in modern industries. These exceptional properties of polyimides are mainly dependent on their chemical structures hence, can be attuned as required. The prime objective of the dissertation was to tailor the properties of polyimides. The task was accomplished by implementing three different methodologies: i) structural modifications of monomers (diamine/dianhydride), ii) copolymerization, and iii) nanocomposite engineering. With respect to structural modifications, eight new diamine monomers were synthesized successfully having systematic and comparable variations in their structures. Their design involved the considerations of structure rigidity (having different contents of aromatic and aliphatic moieties) and catenation (different positioning of amino groups). These synthesized diamines were condensed with three different dianhydrides for the development of twenty four novel polyimides. Another series comprising of fifteen polyimides was prepared by using five structurally related commercial diamines to explore the influence of different side or pendant groups on the properties of resulting polyimides. The dianhydrides used in the project were selected to study the impact of different bridging groups, with respect to tailoring of properties. The new copolyimides were synthesized by simultaneous reaction of two different diamines (one of the synthesized diamine + 4,4ʹ-methylenedianiline) with the same dianhydride. The polyimide nanocomposites were engineered via incorporating Al2O3 and ZnO nanoparticles within the polyimide matrix at different loading levels.The spectroscopic techniques like FTIR and NMR (1H, 13C) were used for structural elucidations of dinitro compounds, diamine monomers, polyimides and copolyimides. The single crystal X-ray diffraction analysis of the synthesized dinitro and diamine compounds validated their proposed structures from the spectroscopic data and provided valuable information about their spatial orientations and inter/intra-molecular attractions. The incorporation of nanoparticles (Al2O3 and ZnO) inside the polyimide matrix was verified by WAXRD analysis while SEM and TEM microscopic techniques disclosed their homogenous distribution throughout the matrix. The properties of polyimides, copolyimides and polyimide nanocomposites were evaluated by dynamic and isothermal TGA (nitrogen and air atmospheres), DMTA (dynamic mechanical thermal analysis) and WAXRD studies. Polyimides displayed significantly high thermal stability as their decomposition started around 400 °C and experienced a relatively small weight loss up to the temperatures of 450-500 °C. Isothermal TGA revealed that the synthesized polyimides displayed substantially high thermal endurance at 400 °C i.e. capable to withstand elevated temperatures for long time. Their thermal performance was affected considerably as a function of monomer architect. The thermal stability/endurance of polyimides was also tailored by changing catenation of amino functionality and substituting different side or pendant groups in the diamine monomers. The nature of bridging group in the dianhydrides influenced the thermal behavior of obtained polyimides. The incorporation of 4,4ʹ-methylenedianiline (MDA) as co-monomer within the backbone of polyimides (copolymerization) resulted in substantial enhancement of their thermal stability and high temperature durability. The nanocomposites engineering also modified the properties of polyimide. The glass transition temperatures of polyimides exhibited an increasing trend with the methyl substitution on the benzene rings of MDA or replacement of its methylene hydrogens with -CF3 and 9-fluorenylidene moieties. However, it was decreased upon ethyl exchange on the benzene rings. The polyimides displayed storage modulus (Eʹ) above one GPa up to the temperature around 250 °C. The Al2O3 and ZnO nanoparticles increased the glass transition temperature of the polyimide matrix in concentration dependent manner up to the optimum level. WAXRD analysis revealed the semicrystalline to amorphous morphology of polyimides depending upon the monomer structure. The polyimides derived from 3,3ʹ,4,4ʹ-benzophenonetetracarboxylic dianhydride (BTDA) and para-catenated diamines displayed semi-crystalline behavior. However, it was decreased upon copolymerization and changed to amorphous while going from: para to meta/ortho or BTDA to ODPA/6FDA analogues (ODPA = 4,4ʹoxydiphthalic anhydride and 6FDA = 4,4''-hexafluoroisopropylidenebisphthalic anhydride).