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Zr-pillared montmorillonite supported cobalt nanoparticles for Fischer–Tropsch synthesis

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Progress in Natural Science:Materials International 2013年第4期23卷 374-381页

作者： nisar ahmad Syed Tajammul Hussain Bakhtiar Muhammad nisar Ali Syed Mustansar Abbas Zulfqar Ali Department of Chemistry Hazara University Nano Science and Catalysis Division National Centre for PhysicsQAU CampusIslamabadPakistan Department of Physics University of the Punjab CEES University of the Punjab

In this article Fischer–Tropsch(FT) synthesis was studied over cobalt nanoparticles supported on modifed Montmorillonite(Zr-PILC).Co-loaded/Zr-PILC catalysts were synthesized by hydrothermal methods and were characterized by XRD,XRF,BET,H2-TPR,TGA and SEM *** reactions were carried out in fxed bed microreactor(T 225 1C,260 1C and 275 1C,P 1,5 and 10 bars).The FT-products obtained over Co-loaded/Zr-PILC catalysts showed increased selectivity of C2–C12hydrocarbons and decreased selectivity towards CH4and higher molecular weight hydrocarbons(C21) at a TOS of 2–30 h as compared to the Co-loaded/NaMMT *** increase in reaction temperature from225 1C to 275 1C,CO-conversion and CH4selectivity increases while that of C5+hydrocarbons *** in CH4selectivity while increase in C5+hydrocarbons and CO-conversion were observed on increasing the pressure of reaction.

关键词： Fischer–Tropsch synthesis Montmorillonite Cobalt Zirconium pillared clay

In vitro larvicidal potential against Anopheles stephensi and antioxidative enzyme activities of Ginkgo biloba,Stevia rebaudiana and Parthenium hysterophorous

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Asian Pacific Journal of Tropical Medicine 2011年第3期4卷 169-175页

作者： nisar ahmad Hina Fazal Bilal H Abbasi Mazhar Iqbal Department of Biotechnology Faculty of Biological SciencesQuaid-i-Azam UniversityIslamabad 45320Pakistan Nuclear Institute for Food and Agriculture(NIFA) Peshawar 2500Pakistan Department of Plant Sciences Faculty of Biological SciencesQuaid-i-Azam UniversityIslamabad 45320Pakistan Pakistan Council of Scientific and Industrial Research(PCSIR)Laboratories Complex Peshawar 2500Pakistan

Objective:To investigate in vitro larvicidal and antioxidant enzymes potential of the medicinal plants Ginkgo biloba（***）,Stevia rebaudiana（***） and Parthenium hysterophorous（***） against Anopheles stephensi（***） 4th instars larvae. Methods:For evaluation of larvicidal potential,the ethanolic,methanolic and dichloromethane leaves extracts of three different plants were used in dose-dependent experiments in two media, while the antioxidant enzymes activities were investigated using four different methods viz., superoxide dismutase,peroxidase,ascorbate and ***:*** has developed resistance to various synthetic insecticides,making its control increasingly *** comparative performance of ethanolic extracts（65%-90%） was found better than the methanolic extract（70%-87%） and dichloromethane extract（60%-70%）.Among the three plants extracts tested in two media,*** exhibited higher larvicidal activity with LC50（24 h） in methanolic extract than *** and *** and *** exhibited the strongest antioxidative enzymes activity and *** were less active and no significant difference was ***:These three plants exhibit larvicidal potential and can be further used for vector control alternative to synthetic insecticide due to eco-friendly and diseases control,furthermore these plant species have potent antioxidative enzyme activities, therefore,making them strong natural candidate particularly for diseases which are caused due to free radicals.

关键词： Larvicidal activity Antioxidative enzymes activities Anopheles stephensi

Amplitude Holograms Using Nanohole Metasurface

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Amplitude Holograms Using Nanohole Metasurface

作者： nisar ahmad Shinwari 湖南大学

学位级别：硕士

作为出色的全息信息载体,超表面全息图具有亚波长像素的优势,从而带来了广阔的视角和更高的分辨率。同时,应该开发智能算法以充分利用超颖表面提供的灵活调制特性。在此,使用纳米孔超表面作为振幅调制装置来实现振幅全息图。采用GS算法... 详细信息

作为出色的全息信息载体,超表面全息图具有亚波长像素的优势,从而带来了广阔的视角和更高的分辨率。同时,应该开发智能算法以充分利用超颖表面提供的灵活调制特性。在此,使用纳米孔超表面作为振幅调制装置来实现振幅全息图。采用GS算法来获得对象“A”的幅值型全息图,只需添加/删除动态像素,即可使两个轮廓相互连接。设计了由纳米孔阵列组成的幅度型超表面,以证明该方案的可行性。这种幅度全息方法可以在可见光波长范围内偏振独立地工作,并且随着材料科学的发展,有望得到进一步的改进。这种方案有望应用于紧凑型数据存储,双模式识别,光学加密等。

关键词：仅振幅全息图纳米孔超颖表面 GS算法

A study on p53 gene alterations in esophageal squamous cell carcinoma and their correlation to common dietary risk factors among population of the Kashmir valley

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World Journal of Gastroenterology 2006年第25期12卷 4033-4037页

作者： Imtiyaz Murtaza Dhuha Mushtaq Mushtaq A Margoob Amit Dutt nisar ahmad Wani Ishfaq ahmad Mohan Lal Bhat Biochemistry and Molecular Biotechnology Laboratory Division of PHT S.K.University of Agricultural Sciences and Technology of KashmirShalimar CampusSrinagarKashmirIndia Department of Biotechnology University of Kashmir SrinagarKashmirIndia Department of Psychiatry Government Medical College SrinagarKashmirIndia Broad Institute of Harvard and MIT 320 Charles St CambridgeMA-02141United States Department of Surgery Government Medical College SrinagarKashmirIndia Department of Pathology Government Medical College SrinagarKashmirIndia

AIM： To systematically examine the extent of correlation of risk factors, such as age, consumed dietary habit and familial predisposition with somatic Tp53 molecular lesion causal to elevate carcinogenesis severity of esophageal squamous cell carcinoma （ESCC） among the Kashmiri population of Northern India. METHODS： All cases （n = 51） and controls （n = 150） were permanent residents of the Kashmir valley. Genetic alterations were determined in exons 5-8 of Tp53 tumor suppressor gene among 45 ESCC cases histologically confirmed by PCR-SSCP analysis. Data for individual cancer cases （n = 45） and inpatient controls （n = 150） with non-cancer disease included information on family history of cancer, thirty prevailing common dietary risk factors along with patient＇s age group. Correlation of genetic lesion in p53 exons to animistic data from these parameters was generated by Chi-square test to all 45 histologically confirmed ESCC cases along with healthy controls.RESULTS： Thirty-five of 45 （77.8%） histologically characterized tumor samples had analogous somatic mutation as opposed to 1 of 45 normal sample obtained from adjacent region from the same patient showed gerrnline mutation. The SSCP analysis demonstrated that most common p53 gene alterations were found in exon 6 （77.7%）, that did not correlate with the age of the individual and clinicopathological parameters but showed significant concordance （P 〈 0.05） with familial history of cancer （CD = 58）, suggesting germline predisposition at an unknown locus, and dietary habit of consuming locally grown Brassica vegetable ＂Hakh＂（CD = 19.5）, red chillies （CD = 20.2）, hot salty soda tea （CD = 2.37） and local baked bread （CD = 1.1）. CONCLUSION： Our study suggests that somatic chromosomal mutations, especially in exon 6 of Tp53 gene, among esophageal cancer patients of an ethnically homogenous population of Kashmir valley are closely related to continued exposure to various common dietary risk factors, especially hot sa

关键词： Case-controls Esophageal squamous cell carcinoma Dietary carcinogens p53 alterations

5G Antenna Gain Enhancement Using a Novel Metasurface

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Computers, Materials & Continua 2022年第8期72卷 3601-3611页

作者： Mubashir Ashfaq Shahid Bashir Syed Imran Hussain Shah nisar ahmad Abbasi Hatem Rmili Muhammad Abbas Khan Department of Electrical Engineering UETPeshawar25000Pakistan Department of Electrical Engineering Chungnam National UniversityDaejeonKorea Department of Electrical Engineering University of Hafr Al BatinKSA Electrical and Computer Engineering Department Faculty of EngineeringKing Abdulaziz UniversityJeddahKSA K.A.CARE Energy Research and Innovation Center King Abdulaziz UniversityJeddah21589KSA Department of Electrical Engineering Balochistan University of Information TechnologyEngineering and Management SciencesQuettaPakistan

This article presents a Sub-6 GHz microstrip patch antenna(MPA)with enhanced gain using metamaterial(MTM)*** source MPA operates at 4.8 GHz and has a peak gain of 5.3 dBi at the resonance frequency.A window-shaped unit cell is designed and investigated through the material wave propagation *** unit cell shows an EpsilonNear Zero(ENZ)-Mu Very Large(MVL)behavior around 4.8 *** unit cell has a fourfold geometry which makes it a polarization independent metamaterial.A double layer antenna is designed by placing a 4×4 MTM slab as a superstrate above the MPA at a height of 0.208λ0;whereλ0 is the free-space wavelength at the resonance frequency of the *** matching and gain of the source antenna is improved using the *** simulation as well as measurement results show that novel antenna system has a peak gain of 7.68 dBi at 4.8 GHz and an impedance bandwidth of 0.22 *** overall dimension of the antenna is 75×60×15 mm^(3).The proposed antenna operates in the Sub-6 GHz band and is suitable for 5G applications.

关键词： Metasurface 5G gain directivity polarization

Dengue fever treatment with Carica papaya leaves extracts

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Asian Pacific Journal of Tropical Biomedicine 2011年第4期1卷 330-333页

作者： nisar ahmad Hina Fazal Muhammad Ayaz Bilal Haider Abbasi Ijaz Mohammad Lubna Fazal Faculty of Biological Sciences Quaid-i-Azam UniversityIslamabad 45320Pakistan Nuclear Institute for Food and Agriculture(NIFA) Tarnab Peshawar 25000Pakistan Pakistan Council of Scientific and Industrial Research(PCSIR) Laboratories Complex Peshawar 25000Pakistan Department of Environmental Sciences University of PeshawarPeshawar 25000Pakistan Postgraduate Medical Institute(PGMI) Lady Reading HospitalPeshawar 25000Pakistan

The main objective of the current study is to investigate the potential of Carica papaya leaves extracts against Dengue fever in 45 year old patient bitten by carrier *** the treatment of Dengue fever the extract was prepared in water.25 mL of aqueous extract of *** leaves was administered to patient infected with Dengue fever twice daily *** and evening for five consecutive *** the extract administration the blood samples from patient were *** count(PLT),White Blood Cells(WBC) and Neutrophils(NEUT) decreased from 176×10~3/μ L,8.10×10~3/μ L,84.0%to 55×10~3/μ L,3.7×10~3/μL and 46.0%.Subsequently,the blood samples were rechecked after the administration of leaves *** was observed that the PLT count increased from 55×10~3/μ L to 168×10~3/μ L,WBC from 3.7×10~3/μ L to 7.7×10~3/μ L and NEUT from 46.0%to 78.3%.From the patient feelings and blood reports it showed that Carica papaya leaves aqueous extract exhibited potential activity against Dengue ***,the different parts of this valuable specie can be further used as a strong natural candidate against viral diseases.

关键词： Dengue fever Carica papaya Leaves extracts Platelets Potential activity

Magnetron sputtered Dy2O3 with chromium and copper contents for antireflective thin films with enhanced absorption

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Journal of Rare Earths 2019年第9期37卷 989-994,I0004页

作者： Shahid M. Ramay Asif Mahmood Hamid M. Ghaithan Nasser S. Al-Zayed Adnan Aslam Abdullah Murtaza nisar ahmad Saadat A. Siddiqi Murtaza Saleem Physics and Astronomy Department College of ScienceKing Saud University RiyadhSaudi Arabia Chemical Engineering Department College of EngineeringKing Saud University RiyadhSaudi Arabia Department of Physics The University of Lahore1-KM Raiwind RoadLahore. Pakistan Interdisciplinary Research Centre in Biomedical Materials COMSATS Institute of Information TechnologyDefence RoadOff Raiwind RoadLahore Pukiston Department of Physics SBASSELahore University of Management Sciences (LUMS)Lahore 4792Pakisran

Dy2O3 is a rare earth oxide having a number of advanced applications in various fields including protective or antireflective coatings,Main objective of this novel research work is to check the effect of Cr and Cu addition on different properties of Dy2O3 and achievement of antireflective thin films with enhanced abso *** films of these materials we re deposited using DC magnetron with reactive *** studies reveals the crystalline nature of thin films having Dy2O3(222)reflection in all samples with Cr2O3(116)and CuO(111)reflections in Cr and Cu containing *** emission scanning electron microscopy demonstrates the homogeneous deposition of thin films with uniform shape,size and distribution of *** index,extinction coefficient and absorption coefficient significantly increase while optical reflectance decreases with Cr and Cu mediation corroborating an improved antireflective *** imaginary part of dielectric constant is found to increase slightly with low tangent loss for Cr containing composition co nsidered favorable for energy storage applications.

关键词： Thin films Dysprosium oxide X-ray diffraction FESEM Optical properties Anti-reflective

Some LpInequalities for B-Operators

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Applied Mathematics 2013年第1期4卷 155-166页

作者： nisar ahmad Rather Sajad Hussain Ahangar Department of mathematics University of Kashmir Harzarbal Sringar India.

If P(z) is a polynomial of degree at most n having all its zeros in , then it was recently claimed by Shah and Liman ([1], estimates for the family of $B$-operators, Operators and Matrices, (2011), 79-87) that for every?R≧1, p ≧ 1, where B is a Bn-operator with parameters in the sense of Rahman [2], and . Unfortunately the proof of this result is not correct. In this paper, we present certain more general sharp Lp-inequalities for Bn-operators which not only provide a correct proof of the above inequality as a special case but also extend them for 0≦p﹤1 as well.

关键词： Lp -Inequalities Bn-Operators Polynomials

On an Operator Preserving Inequalities between Polynomials

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Applied Mathematics 2012年第6期3卷 557-563页

作者： nisar ahmad Rather Mushtaq ahmad Shah Mohd. Ibrahim Mir Post-Graduate Department of Mathematics Kashmir University Hazratbal Srinagar India

Let be the class of polynomials of degree n and a family of operators that map into itself. For , we investigate the dependence of on the maximum modulus of on for arbitrary real or complex numbers , with , and , and ... 详细信息

关键词： Component Polynomials B-Operator Complex Domain