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Study of the Nuclear Transparency Effect at 4. 2 a Gev/C

Thesis Info

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Author

Mohammad Ajaz

Program

PhD

Institute

COMSATS University Islamabad

City

Islamabad

Province

Islamabad.

Country

Pakistan

Thesis Completing Year

2013

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1821

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727399207

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Study of the Nuclear Transparency Effect at 4.2 A GeV/c The use of nuclear transparency effect of protons, p + - and p - - mesons in proton, and deuteron induced interactions with carbon at 4.2 A GeV/c, to get information about properties of nuclear matter is reported in this work. Half angle (θ 1/2 ) technique is used to extract the nuclear transparency effect. The θ 1/2 divides the multiplicity of charged particles produced in nucleon-nucleon collisions into two equal parts depending on their polar angle in the lab. frame. Particles with angle smaller than (incone particles) and greater than (outcone particles) θ 1/2 are considered separate. The average values of multiplicity, momentum and transverse momentum of the protons p + - and p - - mesons are analyzed as a function of a number of identified protons in an event. We observed evidences in the data which could be considered as transparency effect. For quantitative analysis, the results are compared with cascade model. The observed effects are categorized into leading effect transparency and medium effect transparency. Analysis of the results shows that the leading effect is the basis of the observed transparency in the former case. The transparency in the latter case could be the reason of collective interactions of grouped nucleons with the incident particles.
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کھل اُٹھا لالہِ صحرائی ترے ؐآنے سے


کھل اُٹھا لالۂ صحرائی ، ترےؐ آنے سے
’’دل کی دنیا میں بہار آئی ترےؐ آنے سے‘‘

سر نگوں ہو گئی دارائی ترےؐ آنے سے
سرزمیں روم کی تھرَّائی ، ترےؐ آنے سے

تیرے آنے سے بجھا آتشکدۂ فارس
شرک کو ہو گئی پسپائی ، ترےؐ آنے سے

پھر خزاں آنے کا اِمکان ہی باقی نہ رہا
ہوئی ایسی چمن آرائی ، ترےؐ آنے سے

ایک مدت سے تھیں مشتاقِ زیارت آنکھیں
خوش ہوئی چشمِ تمنائی ، ترےؐ آنے سے

اہلِ ایمان کو ایماں پہ ملا اجرِ عظیم
کفر نے اپنی سزا پائی ترےؐ آنے سے

خار و خس ، کوہ و دمن ، دشت و بیاباں ، عرفانؔ
سب کی اُمید ہے بر آئی ، ترےؐ آنے سے

تفسیر‘‘محاسن التاویل’’ میں جلال الدین قاسمی کے منہج کا تحقیقی مطالعہ

Brought up in the context of a very critical time of Islamic history, Imām Muḥammad Jalāl’uddīn Qāsimī (1866-1914) played a vital role to reform and purify the ongoing mindset of the Muslims in Syria in his time. He was a man believed in an independent thinking in the light of the Qur’ān and Sunnah. He taught the people to get rid of the backwardness and blind imitation (Taqlīd). For this purpose of his, he presented the works of the previous leading Islamic Scholars as they were. He was expert in various fields of knowledge like Qur’ān, Ḥadīth and their Sciences, Jurisprudence, Dialectic, etc. One of his masterpieces is his exegesis known as “Maḥāsin al-Tāwīl”. It is a great exegetical work; as most of the exegetical aspects are entertained in it. It has nine or seventeen volumes according to its two different editions, including a whole volume of preamble containing eleven Rules of Quranic Sciences. Although the critics object to his copying the long paragraphs of the prominent Islamic Scholars without commenting or editing and on his long discussions that deviate the reader from the actual purpose of the Holy Qur’ān, but to present the material in this way for the purpose of reformations of Muslims and to bring them back to the way of Salaf through their words, in that crucial time, justifies the significance of the work. In this article, the author probes to present the mythology adopted by Imām Qāsimī in his exegesis and its scholarly merits.

Pakistan-Us Security Relationship 1947-2006 Analysis of Areas of Convergence and Divergence

The US – Pakistan Security Relationship is almost as old as Pakistan itself. Its origin dates back to the initial days of partition, when a nascent, weak nation, born with a major birth defect “The Kashmir Issue”, looked for external help and support against a hegemonic neighbour. Since then, the US-Pakistan security relationship has been a roller – coaster ride of intimate interaction and a pariah state status during Pakistan’s 63 years existence. The world’s major military and economic power has maintained, what has been termed by many as “transactional” relationship, with its much smaller South Asian ally. During the height of the cold war struggle and the heydays of pacts and alliances, as US looked to form an anti - communist ring around the Soviet Union, Pakistan emerged as a staunch ally in the South – Asia region. It was called by many as the “Most Allied Ally” of the United States. In the ardent quest for gaining military and economic benefits from the US, it invited the wrath of the Soviet Union, hoping to use the US support in resolution of the long – standing dispute with India over Kashmir, and bolster its security against Indian military threat. The seismic changes brought about by the Indo – China War of 1962, radically altered this cozy equation for Pakistan. Its rapprochement with China became a major stumbling block in the security relationship and resulted in estrangement with the US. Pakistan’s military gamble in 1965 to settle the Kashmir dispute resulted in disappointment. Not only did the country fail to achieve anything tangible in Kashmir but the war also exposed all the inconsistencies and differences in the strategic perception of US and Pakistan, ultimately ending the security partnership. Though the alliances continued to exist on paper, yet they did not carry any real weight. President Nixon’s quest for rapprochement with China in 1969-1970 ironically brought Pakistan to the centre stage once again. Now the same issue on China, which had been a source of discord, revitalized the mutual relationship. While General Yahya acted as an intermediary in the US – China dialogues, the country drifted towards anarchy and breakup, owing to years of mismanagement and neglect towards the Eastern Wing. India’s invasion of East Pakistan, resulted in dismemberment of the country and a humiliating defeat, which owed much to the problems of successive regimes in West Pakistan. Yet the US response during crisis once again came under sharp criticism, as it was considered to be Pakistan’s patron and ally, and expected to support the country in the time of need. The thesis tries to identify and analyze the differing strategic perspectives during the two Indo-Pakistan Wars, as well as perceptions that resulted in disappointment and disenchantment in Pakistan. In the aftermath of the 1971 debacle, Prime Minister Bhutto looked towards nuclear deterrence as a security against Indian hegemony, because of failure of the security relationship with US to deliver at the critical time. This led to a new source of divergence in the security relationship, as the US non – proliferation goals clashed with Pakistan’s security imperatives. The Soviet invasion of Afghanistan led to a period of close security relationship, which was terminated abruptly by the US, in the wake of Soviet withdrawal from Afghanistan. This decision reinforced perceptions in Pakistan that US is an unreliable partner. The coming decade was that of Pakistan being put under pressure for its nuclear and missile programs. It also pursued an Afghan policy according to its own national interests that further estranged it from its closest ally, with every passing year. Pakistan’s support to the obscurantist Taliban regime resulted in gradual estrangement of the US Government. Even more sinister for Pakistan’s interests, was the nexus between Taliban and Al-Qaeeda. This was however glossed over by Pakistan, till the fateful events of September 11, 2001. The September 11 attack on the World Trade Center in 2001, was a defining moment in the security relationship, as President Musharraf was asked to make a tough policy decision. This time Pakistan was threatened with military action, if it decided to continue support for the Taliban. Pakistan’s decision to join the war on terrorism has resulted in a renewed security relationship with added economic and political benefits. Yet the tough decisions have resulted in internal discontent and unrest, which Pakistan is still grappling with. Now, as the Obama Administration looks towards an exit strategy from Afghanistan, Pakistan figures out as an essential component of any successful US disengagement. Will the security relationship last after the present partnership of war on terror, or wither away as the historical precedent indicates? What are the ideal building blocks of a stable, sustainable and mutually rewarding partnership? These are the questions which this thesis attempts to answer, in the light of the analysis of area of convergence and divergence over the last 63 years.