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Nanocomposites of Polyimide / Functionalized - Zno Nanoparticles: Synthesis and Characterization

Thesis Info

Author

Saz Muhammad

Department

Department of Chemistry, QAUid-I-Azam University

Program

Mphil

Institute

Quaid-i-Azam University

Institute Type

Public

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2014

Thesis Completion Status

Completed

Page

65

Subject

Chemistry

Language

English

Other

Call No: Diss / M. Phil / CHE / 1207

Added

2021-02-17 19:49:13

Modified

2023-02-19 12:33:56

ARI ID

1676718555184

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تیرے دیدار کے ہر آن مزے پاتا ہوں

تیرے دیدار کے ہر آن مزے پاتا ہوں
دیکھنے تجھ کو تصور میں چلا جاتا ہوں

آ ہی جائے گا کبھی تجھ کو دلاسا دینے
قلبِ مضطر کو بہر طور یہ سمجھاتا ہوں

نہ بنا پائیں فسانے یہ زمانے والے
سو ترے ساتھ ملاقات سے گھبراتا ہوں

ہے خبر تم کو مجھے چھوڑ کے جانے والے
کن بہانوں سے دلِ زار کو بہلاتا ہوں

گو اکیلا ہوں بھرے شہر میں تائبؔ لیکن
اپنی تنہائی کسی یاد سے مہکاتا ہوں

Suppressing the Level of Corruption in Kampar District: A Study of The Impact of Accountability, Audit Opinions, Publication of Financial Statements, Audit Results And Follow-Up Of Audit Results

This study aims to evaluate the effects of accountability, audit opinion, financial statement disclosure, audit findings, and follow-up on audit results in reducing corruption levels within the Regional Apparatus Organization (OPD) of Kampar Regency. Conducted through a survey method, the study utilized a purposive sample of 50 accounting and finance professionals to achieve its objectives. Consistent with the research objectives, this study adheres to a conventional academic structure, utilizing clear and objective language, precise technical terminology, and a logical progression of ideas presented in a balanced manner. Primary data was collected via questionnaire distribution. Multiple linear regression tests were utilized to analyze the data. Results indicate that accountability, audit opinion, financial statement disclosure, audit findings, and follow-up of audit results significantly suppress the level of corruption in the Kampar district. It is imperative to follow up on audits to maintain transparency and accountability in the district. Based on simultaneous testing, the evidence suggests that factors such as accountability, audit opinion, disclosure of financial statements, audit findings, and follow-up on audit results play a role in reducing the incidence of corruption in Kampar district, in 2023.

Investigation on Thermal and Ablation Characteristics of Epdm-Filler Composites

The research work is related to the understanding of the effects of fillers loadings on thermal and ablation performances of ethylene–propylene–diene terpolymers (EPDM). EPDM filled with particulate and fibrous fillers are widely used as internal thermal insulator in space vehicles. The most widely used fibrous filler is asbestos. But due to the health hazards posed by asbestos and requirements of space technology, efforts have been initiated for its replacement. In current research, the effects of silica, kevlar and cork on thermal and ablation performances of EPDM based thermal insulators have been investigated. Various batches of thermal insulations were prepared by compounding EPDM with various percentages of silica, kevlar and cork in the presences of other necessary ingredients such as curing agents, accelerators and process aids etc. It was observed that cork and kevlar in the absences of silica did not import enough reinforcement to EPDM to fulfill the requirements of thermal insulations for space vehicles to withstand the stresses during handlings, operations and launching etc. Therefore; thermal and ablation performance of the EPDM batches containing silica only was investigated. Experimental evidences showed that silica had not only enhanced mechanical properties but also improved thermal and ablation performance of EPDM based thermal insulations. However, silica also increased density and thermal conductivity of the thermal insulations, which were the limitations of EPDM loaded with high concentration of silica as far as thermal insulation for space application was concerned. vii In the next phase of research the concentration of silica was limited to 10 Phr (parts per hundred parts of rubber) and kevlar was added at various concentrations in order to remove the drawbacks of high density and high thermal conductivity of silica filled EPDM. Kevlar loadings significantly enhanced thermal and ablation performance of silica-EPDM based thermal insulation by forming a tough char layer on the surface of the insulator. However, the same problem of high density and high thermal conductivity occurred. Kevlar also significantly decreased the elongation of the EPDM based thermal insulator. Cork, a hydrocarbon material with low density and low thermal conductivity was added in various Phr to EPDM loaded with 10 Phr of each silica and kevlar. Cork loadings not only enhanced thermal and ablation performance of the kevlar-silica filled EPDM but significant reduction in thermal conductivity and density was also achieved. Physico- mechanical, thermal and ablation performances of indigenous model insulation based on EPDM filled with hybrid fillers, cork, kevlar and silica were compared with EPDM filled with silica and asbestos. It was observed that model insulation not only exhibited better mechanical, thermal and ablation performances than asbestos based thermal insulation but also significant reduction in thermal conductivity and density was achieved. From the experimental data onset of decomposition temperature (Tonset) and temperature at which maximum degradation occurs (Tmax) of the model insulation for space vehicles were determined. The Flynn-Wall-Ozawa model was successfully used for the determination of activation energy required for thermal decomposition of the insulation. The experimental data obtained at various heating rates were fitted to existing models for the determination of kinetic mechanism of the thermal decomposition of the model insulation. The results showed that model insulation was decomposed according to random nucleation which followed the general mechanism proposed in random nucleation, Avrami Erofe’ev equation. Based on the concept of thermal decomposition by random nucleation, a general decomposition scheme consisting of various reactions was proposed and a kinetic model for thermal decomposition was developed. The developed kinetic model verified that the thermal decomposition of the model insulation was according to random nucleation as the experimental data best fitted to the model equation.