Search or add a thesis

Advanced Search (Beta)
Home > Numerical Investigation on the Dynamic Behavior of Compressible Special Relativistic Flows

Numerical Investigation on the Dynamic Behavior of Compressible Special Relativistic Flows

Thesis Info

Access Option

External Link

Author

Yousaf, Muhammad

Program

PhD

Institute

COMSATS University Islamabad

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2012

Thesis Completion Status

Completed

Subject

Mathemaics

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/2061

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726774845

Asian Research Index Whatsapp Chanel
Asian Research Index Whatsapp Chanel

Join our Whatsapp Channel to get regular updates.

Similar


In this thesis different numerical techniques are investigated for solving compressible spe- cial relativistic hydrodynamic models. Special relativistic flows are encountered in high energy astrophysical jets, gamma-ray bursts, microquasars, active galactic nuclei, and so on. The mathematical models describing these phenomena involve nonlinear complex sys- tems of hyperbolic partial differential equations. These equations are more complicated than the non-relativistic ones due to the nonlinear and implicit relations between conser- vative and primitive variables. The nonlinearity of the systems and flows near the speed of light pose major challenges to the theoretical and numerical investigations. It is desired that the numerical methods for these systems should produce approximate solutions that remain accurate near the shock waves and should be efficient and robust. Failure to ac- complish this often leads to unphysical solutions. Therefore, our goal is to develop and implement simpler, robust, and accurate numerical frame works for solving the system of special relativistic hydrodynamic (SRHD) equations. The space-time CESE method, the discontinuous Galerkin finite element method, the central scheme and the KFVS method are proposed for the numerical simulation of such flows. For validation, several test prob- lems are presented and the numerical results of the schemes are compared with each other and already published results. The numerical results of our proposed methods were found in good agreement with available results from well-established finite volume schemes. In some case studies, the suggested schemes produced better results.
Loading...
Loading...

Similar Books

Loading...

Similar Chapters

Loading...

Similar News

Loading...

Similar Articles

Loading...

Similar Article Headings

Loading...

اُردو کلام

اردوکلام
ی
جے یاری لان دا ول سکھنا جاء پچھ توں قیس سلطان کولوں
مزہ عشق دا چکھنا کہہ جئا جاء پچھ توں شیخ صنعان کولوں
خدمت پیر دی کرنی کہہ جئی جاء پچھ تو ں خواجہ عبدالرحمن کولوں
چاولہ سائیںؔ عشق دا پچھنا ہئی راہ جے کر جاء پچھ توں صوفی اصغر بھٹی خان کولوں

Analysis of Factors that Influence Purchasing Decisions for Wardah Cosmetics in Pekanbaru City

The objective of this study was to identify the factors that influence consumers' decisions to purchase Wardah cosmetics in Pekanbaru city. The sample size consisted of 100 participants selected using the accidental sampling technique. This study aimed to be unbiased, clear, and concise, utilizing a formal register and precise language to ensure comprehension. The data analysis employed quantitative multiple linear regression, and the data were analyzed using the SPSS software. Based on the results of this study, it is evident that product quality has an impact on the decision to purchase Wardah cosmetics in the city of Pekanbaru. The customer's perception of prices also affects their decision to purchase the said cosmetics, as well as promotions.  The independent variables, namely product quality, price perception, and promotion, have a significant impact on the dependent variable, i.e., purchasing decision, concerning Wardah Cosmetics in Pekanbaru city. The R Square value of 0.845 or 84.5% indicates that the purchasing decision is influenced by product quality, price, and promotion while 15.5% is attributable to other variables not considered in this study.

Impact of Brand Knowledge on Brand Equity: Typology of Higher Education Institutions of Khyber Pakhtunkhwa

Brand equity has been realized as central to the marketing of any business including services of higher education institutions (HEIs). Being the direct recipients, students grow firsthand experience about the higher education institution’s brand and therefore, develop specific knowledge about it. Hence, the aim of this study is to enrich the understanding of student’s brand knowledge and its effect on brand equity and to further develop a typology of higher education institutions. This offers the HEIs the capacity to diagnose and solve problems that may help in maximizing the value of their brands. The study encompasses the customer-based brand equity perspective, which concentrated on the effect of two dimensions of brand knowledge that is brand awareness and brand image on brand equity. The study further focused on the relationship of brand knowledge with brand equity in developing a typology of HEIs. For this purpose, a cross-sectional analytical study conducted to verify the proposed model from a population that comprised of the major universities of Khyber Pakhtunkhwa. Using simple random and stratified sampling techniques, the data collected through 42 items survey questionnaire from a sample of 765 students of 12 HEIs. The instrument was adopted from the measures already certified as good, used successfully in different studies, and implemented after establishing the validity and reliability of the scales to suit the setting. The Pearson’s correlation and multiple-regression analyses conducted to test the hypotheses in the model. The results offered empirical proof partially validating the outcomes of previous studies with image related factors of brand knowledge deemed more significant than awareness related factors. Further, a four quadrant strategic typology identified and categorized based on the suggested framework. The study of typology development was an instant success however, with slightly unexpected results as only two typologies identified by the study results. Except for three HEIs all of the remaining Institutions were placed in the “champs” category in the typology which is by far the best category in the typology. The limitation and future directions for research are also discussed.