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mass dependence of pion-induced fission cross sections on the level density parameter

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Chinese Physics C 2012年第9期36卷 831-835页

作者： Zafar Yasin Warda Iram m.ikram shahzad Physics Division PINSTECHP.O.NiloreIslamabadPakistan Physics Department Islamia UniversityBahawalpurPakistan

Fission probabilities and fission cross sections strongly depend on the mass number of the target and energy of the projectile. In this research work, a cascade-exciton model （using CEm95 computer code） has been implemented to observe the dependence of pion-induced fission cross sections and fission probabilities on the target mass and ratio of the level density parameter in fission to neutron emission. The analysis has been performed for both the positive and negative pions as the projectile at 80, 100 and 150 meV energies. The computed cross sections satisfactorily reproduced the experimental findings when compared with the available experimental data in the literature. We observed a smooth dependence at 150 meV, and a sharper dependence at 80 and 100 meV pion energy, in the fissility region above 29.44.

关键词： CEm95 fission cross section level density parameter

Fission studies of gold induced by (1665 meV) π^- using a CR-39 detector

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Chinese Physics C 2012年第2期36卷 132-135页

作者： muhammad ikram shahzad Zafar Yasin Gul Sher Physics Division PINSTECHP.O.NiloreIslamabadPakistan

The fission cross section and fission probability of 197Au, induced by （1665 meV） π-, have been studied using CR-39 track detectors. A 4π-geometry was used to count track statistics. A beam of negative pions of 1665 meV was produced at AGS of Brookhaven National Laboratory, USA, and allowed to fall normally on the stack. Two detectors from the stack were scanned for fission fragment tracks after etching in 6N NaOH at 70 ℃. The statistics of fission fragment tracks in both detectors were obtained. It was found that there was a marked asymmetry of registered tracks with respect to the forward and backward hemispheres. This asymmetry could be partly accounted for on the basis of momentum transfer to the struck nucleus. On the basis of counting statistics fission cross section was measured, and fission probability was determined by dividing the fission cross section with the reaction cross section. The fission cross-section and fission probability were compared with the computed values using the caseade-exciton model code CEm95.

关键词： CR-39 fission cross section CEm95

Cascade-exciton model analysis of mass dependence of pion-induced fission

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Chinese Physics C 2014年第7期38卷 92-96页

作者： muhammad ikram shahzad Zafar Yasin Warda Iram Shahida Jabeen Physics Division PINSTECH P.O. Nilore Islamabad Pakistan Physics Department Islamia University Bahawalpur Pakistan Physics Department AJ&K University Muzaffarbad Pakistan

The cascade-exciton model has been used to observe the dependence of pion induced fission cross sections on the mass of the target. The analysis has been performed at energies 80 meV, 100 meV and 150 meV for both the positive and negative pions. It has been shown that a single value of the ratio af/an can satisfactorily reproduce the experimental findings when compared with the available experimental data in the literature. The general trend of the fission cross sections with mass （fissility parameter） is seen to be low and slowly changing for the lighter nuclei, and it will steeply rise for the heavy nuclei.

关键词： cascade-exciton model pion-induced fission cross sections

Does abnormal lending behavior increase bank riskiness?Evidence from Turkey

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Financial Innovation 2019年第1期5卷 630-644页

作者： Farrukh shahzad Zeeshan Fareed Bushra Zulfiqar Umme Habiba muhammad ikram School of Economic and Business Administration Chongqing UniversityChongqingChina School of Business Huzhou UniversityHuzhou CityZhejiang ProvinceChina School of Economics Southwestern University of Finance and EconomicsChengduChina School of Finance Shanxi University of Finance and EconomicsTaiyuanShanxi ProvinceChina College of Economics and management Nanjing University of Aeronautics and Astronautics NanjingChina

Purpose:This study empirically analyzes whether the rapid growth of loans and risktaking behavior during the expansion of loans affected non-performing loans(NPLs)and the solvency of financial institutions in the Turkish banking ***/methodology/approach:Using the Gmm Generalized method of moments,this study used data on Turkish banks from 2011 to 2017 to test two hypotheses on the effects of loan growth on NPLs and ***:This study finds significant results for the effect of loan growth on NPLs and *** rose from the previous year’s loan growth,which tended to reduce *** limitations/implications:Due to selected research methods,the results may lack ***,future studies should test the propositions herein *** implications:The results indicate that careful allocation behavior is required when ***,these findings may be helpful to financial managers and decision ***/value:This study confirms the need to determine how to allocate loans during the loan boom periods.

关键词： Turkish banks Non-performing loans Loan growth Solvency Gmm

Radionuclide concentrations in sand samples from riverbanks of muzaffarabad,Azad Kashmir

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Nuclear Science and Techniques 2018年第7期29卷 103-115页

作者： Abdul Razzaq Khan muhammad Rafique Abdul Jabbar Saeed Ur Rahman muhammad ikram shahzad muhammad Ejaiz Khan mulaika Yasin Department of Physics University of Azad Jammu andKashmir MuzaffarbadAzad Kashmir 13100Pakistan Health Physics Division Pakistan Institute of NuclearScience and Engineering(PINSTECH)NiloreIslamabad 45650Pakistan Department of medical Physics Nuclear MedicineOncologyand Radiotherapy InstituteIslamabadPakistan Physics Division Directorate of SciencePINSTECHP.O.NiloreIslamabad 45650Pakistan

This paper presents the results of a radiological risk assessment arising from the presence of naturally occurring radionuclides in sand samples from three riverbanks in *** mean values obtained for 232 Th,226 Ra,and 40 K were found to be 44.58 ± 3.34,48.25 ± 1.77,and 239.92 ± 22.73 Bq kg^(-1),*** assess the uniformity of exposure,the radium equivalent activity(Raeq) was calculated and was found to be130.47 ± 8.29 Bqkg^(-1).The current reported value for Raeqis lower than the maximum permissible value,that is,370 Bq kg^(-1),and equivalent to a gamma dose of1.5 m Svy^(-1).To investigate the possible contribution to health risks of alpha particle exposure,the radon exhalation rate(RER) from the sand samples was *** mean RER for all the samples was found to be335 m Bq m-^(2) h^(-1).About 43% of the samples were found to have an indoor excess lifetime cancer risk value slightly higher than recommended safety limit of 1,as proposed by the ICRP.A normalized parameter,the equivalent multiplicative factor,was defined and used to compare the current results with the findings of studies performed in other *** findings are relevant to both human health and future environmental radiation monitoring.

关键词：放射性核种样品克什米尔河岸风险评价调查结果 226Ra gamma

Generalized Ⅰ-Nonexpansive Selfmaps and Invariant Approximations

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Acta mathematica Sinica,English Series 2008年第5期24卷 867-876页

作者： m.A.AL-THAGAFI Naseer shahzad Department of mathematics King AbduIAziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

Common fixed point results for new classes of noncommuting selfmaps satisfying generalized I-contraction or I-nonexpansive type conditions are established. We apply them to obtain several invariant approximation resul... 详细信息

关键词： common fixed point occasionally weakly compatible map ultraoccasionally weakly compatible map generalized I-nonexpansive map invariant approximation

Hydrodynamics of viscous fluid through porous slit with linear absorption

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Applied mathematics and mechanics(English Edition) 2016年第3期37卷 361-378页

作者： A.m.SIDDIQUI T.HAROON A.shahzad Department of mathematics Pennsylvania State UniversityYork Campus Department of mathematics COMSATS Institute of Information Technology

The exact solutions for the viscous fluid through a porous slit with linear ab- sorption are obtained. The Stokes equation with non-homogeneous boundary conditions is solved to get the expressions for the velocity components, pressure distribution, wall shear stress, fractional absorption, and leakage flux. The volume flow rate and mean flow rate are found to be useful in obtaining a convenient form of the longitudinal velocity component and pressure difference. The points of the maximum velocity components for a fixed axial distance are identified. The value of the linear absorption parameter is ran- domly chosen, and the rest available data of the rat kidney to the tabulate pressure drop and fractional absorption are incorporated. The effects of the linear absorption, uniform absorption, and flow rate parameters on the flow properties are discussed by graphs. It is found that forward flow occurs only if the volume flux per unit width is greater than the absorption velocity throughout the length of the slit, otherwise back flow may occur. The leakage flux increases with the increase in the linear absorption parameter. Streamlines are drawn to help the analysis of the flow behaviors during the absorption of the fluid flow through the renal tubule and purification of blood through an artificial kidney.

关键词： exact solution porous slit linear absorption renal tubule

Comparison of Radionuclide’s Inventories and Activities With Slightly Enriched Uranium and Plutonium Fuel in CANDU Reactors

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World Journal of Nuclear Science and Technology 2011年第2期1卷 31-36页

作者： Zafar Yasin Javaid Iqbal m. ikram shahzad Pakistan Institute of Engineering and Applied Sciences

In these studies the isotopic inventories and corresponding activities of important nuclides for different fuel cycles of a CANDU reactor have been compared. The calculations have been performed using the computer code WImSD4. The isotopic inventories and activities have been calculated versus the fuel burn-up for the natural UO2 fuel, 1.2% enriched UO2 fuel and for the 0.45% PuO2-UO2 fuel. It is found that 1.2% enriched uranium fuel has the lowest activity as compared to other two fuel cycles and vice versa for the 0.45% PuO2-UO2 fuel.

关键词： Actinide and Fission Product Inventory CANDU Natural Uranium Plutonium

Fragmentation Cross Sections of 158 AGeV Pb Projectiles

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Chinese Physics Letters 2007年第10期24卷 2800-2803页

作者： G. Sher m.I. shahzad m. Hussain Physics Division PINSTECH Islamabad Pakistan Department of Physics University of the Punjab Lahore Pakistan

We investigate the fragmentation cross sections of 158 AGeV ^207Pb projectile interacting with different targets using CR39 nuclear track detectors. The exposure is made at SPS beam facility of CERN. The detectors are chemically etched to obtain data in the form of etched cone length. The nuclear and electromagnetic contributions to the measured total charge-changing cross sections are investigated. The estimated results are compared with those found in the literature for similar research work.

关键词： coated conductor buffer layer self-epitaxy CeO2