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Three-Step Iterative Methods for Solving Non-Linear Equations

Thesis Info

Author

Tooba Zaman

Supervisor

Nazir Ahmad Mir

Department

Department of Mathematics

Program

BS

Institute

COMSATS University Islamabad

Institute Type

Public

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2007

Thesis Completion Status

Completed

Subject

Mathematics

Language

English

Added

2021-02-17 19:49:13

Modified

2023-01-06 19:20:37

ARI ID

1676720766191

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Pak-China Defense Cooperation and Evolving International Relations

This study is about the impact of different global and regional changes resulting from PakistanChina’s defense cooperation and further examines the increasing range of diplomatic cooperation in the social, tactical, and economic realms. The paper focuses on three events: (i) the 1978 transformation of China and its opening-up policies; (ii) disbanding of the U.S.S.R (1991); and (iii) the event of 9/11 in the United States. These events had a significant influence on Pak-China ties. This study is a literature review and contributes to a better understanding of the evolving international systems namely the India-U.S. Tactical relations and strategic cooperation. The paper concludes that China and Pakistan need to preserve amicable, strategic, and diplomatic connections with one another as it is necessary for the peace, security, and economic development of not only China and Pakistan but for the region overall.

Development of a Suitable Semen Extender for the Cryopreservation of Nili Ravi Buffalo Bul 9Bubalus Bubalis Semen

Presently, buffalo farmers are dissatisfied with fertility rates of the frozen semen used in the field and tend to use bulls. This study was designed to develop a suitable semen extender for cryopreservation of Nili Ravi buffalo semen that can improve conception rate in buffaloes. Experiment-I, an attempt was made to develop semen extender with optimal osmotic pressure for buffalo semen using tris citric acid (TCAE), skim milk (SME) and coconut water (CWE) extenders (each extender have 260, 270, 280, 290 and 300 mOsm/kg osmotic pressure levels). In Experiment-II, best extender (TCAE: 300 mOsm/kg) of experiment-I was tried to improve post thaw spermatozoa characteristics by supplementing antioxidants [0.0, 1.75, 2.0 and 2.25 mM butylated hydroxy toluene (BHT) and 0.0, 2.0, 5.0 and 8.0 mM L-cysteine]. Post thaw spermatozoa motility, viability, plasma membrane integrity (PMI), DNA damage rate and lipid peroxidation were assessed in first two experiments. In Experiment-III, pregnancy rate assessment of extended semen was carried out by using Trial extender (best of experiment II) or Control extender of Semen Production Unit (SPU), Qadirabad, Pakistan (50 inseminations of each extender). Higher spermatozoa motility at ≥ 270 mOsm/kg was noted in TCAE than both SME and CWE could be due to less intracellular ice formation in zwitterions extender. Higher spermatozoa viability in TCAE and CWE compared to SME may be attributed to extender effectiveness. Higher acrosomal integrity rate at 300 mOsm/kg in TCAE and SME may be because of less intracellular ice formation in isotonic extenders. At 290 mOsm/kg, higher spermatozoa PMI in SME and lesser DNA damage in three extenders might be due to lesser intracellular ice formation at cryopreservation. Decreased spermatozoa DNA damage in SME might be due to the presence of natural antioxidants i.e., casein. Higher lipid peroxidation in CWE than TCAE and SME may be due to presence of natural antioxidants (in SME) and higher cell dehydration potential of TCAE. Higher spermatozoa motility recorded at 2.0 mM BHT compared to other BHT groups including DMSO might be due to fact that BHT protects spermatozoa mitochondria by reducing oxidative stress. Lower spermatozoa viability, PMI rates and higher DNA damage at 2.25 mM of BHT may be due to BHT toxic effects. Lower lipid peroxidation in BHT treated groups compared to DMSO and BHT control groups might be related to BHT strong antioxidant properties. L-cysteine caused higher spermatozoa DNA damage at highest level (i.e., 8 mM) that could also be due to antioxidant’s toxic effect. Pregnancy rate 18 % higher was noted in Trial than Control semen extender; however no significant difference have been noted that might be due to less no of inseminations. In conclusion, TCA extender (300 mOsm/kg) having BHT (2.0 mM) improved post thaw semen quality and yielded numerically better pregnancy rates. Results of study indicated that osmotic stress damaged the spermatozoa internal structures more severely than injury to plasma membrane.