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Home > Computer Simulation of Point Defect Twin Boundary Interactions in Face Centred Cubic Metals.

Computer Simulation of Point Defect Twin Boundary Interactions in Face Centred Cubic Metals.

Thesis Info

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Author

Ghafoor, Abdul

Program

PhD

Institute

The Islamia University of Bahawalpur

City

Bahawalpur

Province

Punjab

Country

Pakistan

Thesis Completing Year

1993

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/3036/1/211.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725780216

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A new method has been established to compute the variants of point defect clusters depending on their symmetry. Results are presented! for close- packed clusters of up to five point defects in cubic crystals. Interesting) relations among the variants of point defect clusters in two and three dimensiqnal lattice structures have been noted. Computer simulation techniques haye been employed to determine the relaxed structures and energies of sortie planar defects using manv-body potentials developed by Ackland et at. (198ir). The structures of some low index twin boundaries, e g. (130), (1j23), (140) and (114) in Copper, are explored 4? to examine their energy configurations. In (140) and (114) twin boundaries local atomic adjustments are made to obtain low interfacial energy. The atomic planes twin interface in all the cases. The interactions of coalesce at the vacancy with (1$0), (123), (140) and (114) boundaries are studied. For single vacancy the maximum binding energy for (123) and (114) boundary is observed when vacancy lies at the plane adjacen: to the interface. The structures and energies of (111), (001) and (110) twist boundaries with different misorientation angles in copper, silver, and investigated as well. It is observed that in-plane translations are flold necessary to establish low energy (110) twist boundary.
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چشم کشا انٹر ویو

چشم کُشا انٹر ویو

پاکستان پیپلز پارٹی کن حالات و مقاصد کے لیے قائم ہوئی ،پارٹی سے قبل لاہور کی کن شخصیات سے بھٹو صاحب کی قربت تھی ۔شہید بھٹو کی پارٹی کے قیام سے پہلے لاہور ،لائلپور ،گجرات کے دوروں کے دوران عوام کی طرف سے والہانہ اظہار محبت کے کیا کیا واقعات پیش آئے ،تاسیسی اجلاس میں لاہور ،قصور ،راولپنڈی ،فیصل آباد ،سرگودھا ،ملتان ،ساہیوال ،وہاڑی اور سندھ سے شریک ہو نے والے مندوبین کون تھے ۔لیفٹ کی بھٹو شہید سے نفرت کے محرکات کیا ہیں ۔ہالا کنونشن میں معراج محمد خان کی طرف سے پرچی کی بجائے برچھی سے خون سوشلسٹ انقلاب کے مطالبہ پر قائد عوام نے کیا جواب دیا ۔۔۔۔یہ سب کچھ جاننے کے لیے پاکستان پیپلز پارٹی کے بانی،رکن ،شہید بھٹو کے ساتھی ،ترقی پسند دانشور ،شاعر ،محقق و ادیب جناب اسلم گورداسپوری کا چشم کشا مضمون ۔

عام تاثر یہی تھا اور اب بھی ہے کہ پاکستان پیپلز پارٹی والے کھلے ،ڈلے ،منہ پھٹ ،سر کش ، اپنی لیڈر شپ کے ساتھ زیادہ فرینک قسم کے لوگ ہوتے ہیں جبکہ مسلم لیگیے عموما کاروباری ٹائپ ، میسنے ،موقع شناس و موقع پرست چاپلوس قسم کی طبیعتوںکے مالک ہو تے ہیں جوکبھی ’’گیلے ‘‘پر پائوںنہیں رکھتے ،رسک نہیں لیتے ،انتہائی لچکدار ’’کردار ‘‘کے حامل ہوتے ہیں ۔ماضی کی حد تک یہ تاثر شاید درست بھی تھا کہ معراج محمد خان ،مختار رانا آف لائلپور ،جے اے رحیم اور حنیف رامے جیسے نرم مزاج ،دانشور مصور فنکار قسم کے لوگ بھی بھٹو جیسے بندے کے خلاف ڈھے گئے ۔جبکہ مسلم لیگ کے مزاج میں سازش اور ٹانگیں کھینچنا تو موجود تھا لیکن آنکھوں میں آنکھیں ڈال کر مزاحمت کا رواج ہر گز نہیں تھا لیکن اب تو یوں محسوس ہوتا ہے کہ رولز ہی ریورس ہوگئے...

دور حاضر میں کرنسیوں کے ادھار خرید و فروخت کا شرعی جائزہ

Foreign Exchange trading is when you buy and sell foreign currencies to generate profit. In our age of advance technology even the virtual or digital currencies have now emerged. This entire business however is mostly based upon speculation and prediction. Even the most skilled and experienced traders face difficulty in predicting movements in currencies. Further, the value of not well established currencies can fluctuate or its exchange rate value can change any time. In view of occupying central place in the economic systems down the ages, Muslim scholars have also vehemently discussed currency, its significanc and matters relating to it in transactions. The present article reviews trading of foreign currencies from Islamic perspective in a situation when no cash is involved in the transaction. The article concludes that as the currencies in such transactions are different commodities, therefore their trade is legal.

Taxonomic Study of Chalcididae Chalcidoidea: Hymenoptera of Khyber Pakhtunkhwa-Pakistan

A study was initiated on Taxonomy of Chalcididae of Khyber Pakhtunkhwa, Pakistan. Diverse ecological zones were surveyed at different times and seasons of the year. Most of the collection was done from grasses and low vegetation during 1998-2014. Some of the species were reared from their hosts in laboratory. Two hundred specimens of Chalcididae were examined. It was found that 26 species belonging to 11 genera under four subfamilies are occurring in the area. The subfamilies include Haltichellinae, Chalcidinae, Dirhininae and Epitraninae. Subfamily Haltichellinae comprises of genus Antrocephalus Kirby, Hockeria Walker, Kriechbaumerella Dalla Torre, Neochalcis Kirby, Neohybothorax Nikol’skaya, Psilochalcis Kieffer and Proconura Dodd & Girault. Genus Antrocephalus Kirby include two species viz., Antrocephalus mitys Walker and A. nicus Narendran; genus Hockeria Walker is represented by two species viz., Hockeria argentigera Holmgren and H. nikolskayae Husain & Agarwal; genus Kriechbaumeralla Dalla Torre consist of Kriechbaumerella ayyari (Gahan) and K. kala Narendran; genus Neochalcis Kirby comprises of only one species, Neochalcis breviceps (Masi); genus Neohybothorax is represented by one species, Neohybothoax hetera (Walker); genus Psilochalis Kieffer is also represented by one species Psilochalcis carinigena (Cameron) and genus Proconura Dodd & Girault comprises of one species Proconura minusa Narendran. Two genera namely, genus Brachymeria Westwood and genus Chalcis Fabricius were found in Subfamily Chalcidinae. Genus Brachymeria Westwood was found to be the most speciose genus with 8 species including Brachymeria alternipes (Walker), B. apicicornis (Cameron), B. jambolana (Gahan), B. marginiscutis (Cameron), B. minuta (Linnaeus), B. podagrica (Fabricius), B. habui Huseyin Ozdikmen and B. medicina Joseph, Narendran & Joy. Genus Chalcis Fabricius is represented by a single species Chalcis gibsoni Narendran. Subfamily Dirhininae includes one genus Dirhinus Dalman which is represented by five species viz., Dirhinus anthracia Dalman, Dirhinus auratus Ashmead, Dirhinus hesperidum (Rossi), Dirhinus himalayanus Westwood and Dirhinus secundarius Masi. Subfamily Epitraninae contains one genus Epitranus Walker. Two species Epitranus parvidens (Strand) and Epitranus elongatulus (Motschulsky) were found in genus Epitranus Walker. All except H. nikolskayae are new records for Khyber Pakhtunkhwa. Illustrated keys to the genera and species of Chalcididae of Khyber Pakhtunkhwa are provided. Host range, distribution, type material examined and improved description of males and females are also provided. The species were confirmed by comparing them with paratypes available at Bohart Museum of Entomology, University of California, Davis, USA.