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Home > The Emission of Soft Electromagnetic Radiation from Metals under High and Low Energy Positive Ions Bombardment, and Photo‐Ionization and Photo‐Emission in Geiger Muller Tubes

The Emission of Soft Electromagnetic Radiation from Metals under High and Low Energy Positive Ions Bombardment, and Photo‐Ionization and Photo‐Emission in Geiger Muller Tubes

Thesis Info

Author

Mustafa Yar Khan

Department

Faculty of Science,Department of Physics

Program

PhD

Institute

University of the Punjab

Institute Type

Public

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

1968

Thesis Completion Status

Completed

Subject

Physics

Language

English

Added

2021-02-17 19:49:13

Modified

2023-01-06 19:20:37

ARI ID

1676728945189

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سر شانتی سروپ بھٹناگر

سرشانتی سروپ بھٹنا گر
افسوس ہے پچھلے دنوں سرشانتی سروپ بھٹنا گراور پنڈت کشن پرشاد کول، ملک کی دونامور شخصیتوں نے وفات پائی اور ملک ان کی خدمات سے محروم ہوگیا۔اول الذکر ہندوستان کے نامور سائنٹسٹ تھے۔ کیمسٹری اور فزکس میں بین الاقوامی شہرت کے مالک تھے، آزادی کے بعد سے ملک میں جو صنعتی ترقی ہوئی ہے اور سائنس نے جو فروغ پایا ہے اس میں سرشانتی سروپ کابہت بڑا حصّہ ہے۔پھربڑی بات یہ ہے کہ وہ مرزا غالبؔ کے محبوب شاگرد اور دوست منشی ہرگوپال تفتہ جن کو مرزا نوشہ محبت میں مرزا تفتہ کہاکرتے تھے ان کے نواسے تھے اور انھوں نے اردو شعروشاعری کاذوق ورثہ میں پایا تھا۔ چنانچہ وہ اُردو کے صاحب دیوان شاعر بھی تھے۔مشاعروں کی صدارت بھی کرتے تھے اور اپنے دوست احباب کوجن میں شامل ہونے کا فخر راقم الحروف کوبھی تھا،اپنے اشعار بڑے مزے میں سناتے تھے۔ سائنس اور شاعری کے لطیف امتزاج اورخاندانی روایات کے باعث وہ ہماری گذشتہ تہذیب اور کلچر کے سچے حامل اورعلم بردار تھے۔ اب ان کی وفات سے جو خلا پیدا ہوگیا ہے اس کاپُر ہونا مشکل ہے۔
[ فروری ۱۹۵۵ء]

 

اسلام میں عورت کے حق طلاق کی حیثیت ایک تحقیقی جائزہ

Of the several factors that justify the greatness of Islamic Culture and survived the test of time, one is the pride of place ascribed to woman in human society. Since the dawn of Islamic civilization, woman has been respected and cored and her rights have been protected and, thus, womanfolk has been made a purposeful existence. However, Islam, being a religion of nature, does not bring woman on the line of equality with man as the Islam is the religion of justice; not that of equality. The Holy Quran has very apparently determined the rights and duties of man and woman and these all are based on natural facts and laws as well. In the contemporary times, progressive as well as west-inspired circles of our society have put numerous objections on the issue of divorce. They opine that by giving man right to divorce, woman has been deprived of equal status; hence this one-sided right has not only disturbed the family life, but put woman at an interior place. This point of view does not testify to the very facts of Islamic practices in connection with the institution of divorce. In order to understand the historical background of the institution of divorce, laws and practices in vogue in two major religions of the world-Judaism and Christianity, are discussed in a brief manner. Besides, various reforms, from time and again, introduced in divorce in west are also touched upon in nutshell. However, major portion of this article focuses on Islamic teachings regarding divorce and its implications. Therefore, this research article attempts to highlight the various aspects of divorce in the light of Islamicteachings in a comprehensive manner so as to remove the doubts of so-called west-oriented circles of our society.

Fabrication and Characterization of Low Cost Electrodes for Fuel Cells

Fuel cell is an emerging, cleanest, environmental friendly and pollution free technology, which converts chemical energy of fuel into electricity, heat and power without combustion. Fuel cells are categorized according to their electrolytic materials and working temperature. Solid oxide fuel cell (SOFC) is the most dominant and prominent among the fuel cell family. In other words, fuel cell is one of the most competitive candidates that could provide possibly accomplishments. Conventionally, Ni-YSZ cermet anode is used in SOFC, which works in the temperature range of 800-1000oC. Although this anode possesses a high electrochemical activity, high performance as well as electronic conductivity yet it requires a high working temperature to achieve the optimal results. Its high working temperature is the present draw back which becomes a major barrier to its commercialization. If this cell has to be commercialized then there is need to find suitable electrode materials that can operate successfully at low operating temperature. Keeping this in mind, many new electrode materials have been introduced in the present work, which have been classified into two groups; one is containing Ni partially while the other is completely Ni free. New electrode materials were prepared by introducing nano technique using either dry or wet chemical method with an added advantage of low manufacturing temperature. In order to fabricate a complete fuel cell, the compatible electrolyte materials were also prepared by co-precipitation method. These materials exhibited an excellent performance at comparatively low temperature (400-600 oC). For SOFC electrode and electrolyte purpose, CuNiZnGdCe (CNZGC), Al0.1NixZn0.9-x (ANZ), Cu0.2Mn0.2Zn0.6 (CMZ), Ba0.05Cu0.25FexZn0.7-x (BCFZ) Ba0.15Fe0.10Ti0.15Zn0.60 (BFTZ), Ba0.4Sr0.6Co 0.3Mn0.7 (BSCM), La0.1Sr0.9Co0.2Zn0.8 (LSCZ), Na2CO3-K2CO3- Ca0.2Ce0.8 (NK-CDC) and Gd0.1Ce0.9-Y2O3 (Y-GDC) materials were successfully synthesized by solid state reaction method or wet chemical and co-precipitation method. These electrodes and electrolyte materials were characterized by XRD, SEM, TEM, electrochemical and electrical techniques. It has been found that the BCFZ-5 having a composition of Ba0.05Cu0.25Fe0.10Zn0.60 shows an electrical conductivity equal to 25.84 at hydrogen atmosphere. It also exhibited the maximum power density of 741.87mW/cm2 and 933.41mW/cm2 for symmetrical and asymmetrical fuel cell testing schemes. On the basis of these results, BCFZ-5 material is considered a promising electrode/anode candidate for low temperature solid oxide fuel cell. Different approaches have been implemented to reduce the present cost of electrode and electrolyte materials for solid oxide fuel cell. For example; I. II. Use of cheap raw material Lowering of sintering temperature III. Reduction of sintering time IV. Lowering of operating/working temperature It has been noted that the substitution of zinc compound Zn(NO3)2.6H2O in place of nickel oxide (NiO) has reduced the cost by a factor of ≈25 in addition to the lowering of manufacturing and operating temperature, which also reduces the cost indirectly by saving energy and time. Moreover, the cost has been further reduced by a factor of 35 and 18 when samarium nitrate Sm(NO3)3.6H2O and gadolinium nitrate Gd(NO3)3.6H2O are respectively replaced by calcium nitrate Ca(NO3)2.4H2O. The lowering of working temperature from 1000 to 550oC is a major achievement that would not only reduce the running cost yet it may help in commercialization of solid oxide fuel cell. In a nut shell the electrodes and electrolytes proposed in the present work have successfully lowered the manufacturing as well as working temperature and hence the operational cost along with a significant reduction in the manufacturing cost of solid oxide fuel cell (SOFC). Key words: Solid Oxide Fuel Cell (SOFC), Zn Based Electrodes, Nano-composites Electrodes, Energy Conversion Device, Ceria Carbonated Fuel Cell, Advanced Fuel Cell, Efficient Device, BCFZ anode, NKCDC electrolyte, Novel Cathode