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Aluminium phthalocyanine chloride thin films for temperature sensing

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Chinese Physics B 2013年第11期22卷 629-633页

作者： muhammad Tariq Saeed Chani Abdullah m.Asiri Kh.S.Karimov Atif khan Niaz Sher Bhadar khan khalid.A.Alamry Center of Excellence for Advanced materials Research King Abdulaziz University Department of Chemistry Faculty of Science King Abdulaziz University GIK Institute of Engineering Sciences and Technology Physical Technical Institute Aini St. 299/1

This study presents the fabrication and temperature sensing properties of sensors based on aluminium phthalocyanine chloride （AlPcCl） thin films. To fabricate the sensors, 50-nm-thick electrodes with 50-μ gaps between them are deposited on glass substrates. AlPcCl thin films with thickness of 50–100 nm are deposited in the gap between electrodes by thermal evaporation. The resistance of the sensors decreases with increasing thickness and the annealing at 100 ℃ results in an increase in the initial resistance of sensors up to 24%. The sensing mechanism is based on the change in resistance with temperature. For temperature varying from 25 ℃ to 80 ℃, the change in resistance is up to 60%. Simulation is carried out and results obtained coincide with experimental data with an error of ±1%.

关键词： temperature sensor thin films annealing aluminium phthalocyanine chloride

Response of Wheat to Tillage Plus Rice Residue and Nitrogen management in Rice-Wheat System

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Journal of Integrative Agriculture 2014年第11期13卷 2389-2398页

作者： khalid Usman Ejaz Ahmad khan Niamatullah khan Abdur Rashid Fazal Yazdan Saleem Ud Din Department of Agronomy Faculty of Agriculture Gomal UniversityD. I. Khan 29050 Pakistan Cotton Research Station Ratta KulachiD. I. Khan 29050 Pakistan Arid Zone Research Institute Ratta KulachiD. I. Khan 29050 Pakistan Oil Seed Research Program National Agricultural Research CentreIslamabad 44000Pakistan

Zero tillage with residues retention and optimizing nitrogen fertilization are important strategies to improve soil quality and wheat （Triticum aestivum L.） yield in rice （Oryza sativa L.）-wheat system. Field experiments were conducted on silty clay soil （Hyperthermic, and Typic Torrilfuvents） in D. I. khan, Pakistan, to explore the impact of six tillage methods （zero tillage straw retained （ZTsr）, ZT straw burnt （ZTsb）, reduced tillage straw incorporated （RTsi, including tiller and rotavator）, RT straw burnt （RTsb）, conventional tillage straw incorporated （CTsi, including disc plow, tiller, rotavator, and leveling operations）, CT straw burnt （CTsb）） and ifve nitrogen rates, i.e., 0, 100, 150, 200, and 250 kg ha-1 on wheat yield. mean values for N revealed that spikes m-2, grains/spike, 1 000-grain weight （g）, and grain yield （kg ha-1） were signiifcantly higher at 200 kg N ha-1 in both the years as well as mean over years than all other treatments. mean values for tillage revealed that ZTsr produced highest number of spikes m-2 among tillage methods. However, grains/spike, 1 000-grain weight, and grain yield were higher in tillage methods with either straw retained/incorporated than tillage methods with straw burnt. Interaction effects were signiifcant in year 1 and in mean over years regarding spikes m-2, 1 000-grain weight, total soil organic matter （SOm）, and total soil N （TSN）. ZTsr produced the most spikes m-2 and 1 000-grain weight at 200 kg N ha-1. ZTsr also produced higher SOm and TSN at 200-250 kg N ha-1 at the end of 2 yr cropping. Thus ZTsr with 200 kg N ha-1 may be an optimum and sustainable approach to enhance wheat yield and soil quality in rice-wheat system.

关键词： wheat yield tillage nitrogen TSN SOm

Short Response of Spring Wheat to Tillage, Residue management and Split Nitrogen Application in a Rice-Wheat System

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Journal of Integrative Agriculture 2014年第12期13卷 2625-2633页

作者： khalid Usman Ejaz Ahmad khan Fazal Yazdan Niamatullah khan Abdur Rashid Saleem Ud Din Department of Agronomy Faculty of Agriculture Gomal UniversityD. I. Khan 29050 Pakistan Oil Seed Research Programme National Agricultural Research Center (NARC) Cotton Research Station Ratta Kulachi D. I. Khan 29050 Pakistan Arid Zone Research Institute Ratta Kulachi D. I. Khan 29050 Pakistan

A ifeld experiment was conducted to study the impact of tillage, crop residue management and nitrogen （N） splitting on spring wheat （Triticum aestivum L.） yield over 2 yr （2010-2012） in a rice （Oryza sativa L.）-wheat system in northwestern Pakistan. The experiment was conducted as split plot arranged in randomized complete blocks design with three replications. Treatments comprised six tillage and residue managements：zero tillage straw retained （ZTsr）, zero tillage straw burnt （ZTsb）, reduced tillage straw incorporated （RTsi）, reduced tillage straw burnt （RTsb）, conventional tillage straw incorporated （CTsi）, and conventional tillage straw burnt （CTsb） as main plots and N （200 kg ha-1） was applied as split form viz., control （no nitrogen＆no splitting, N0S0）;2 splits of total N, half at sowing and half at the 1st irrigation （i.e., 20 d after sowing （DAS））（NS1）;3 splits of total N, 1/3 at sowing, 1/3 at the 1st irrigation, and 1/3 at the 2nd irrigation （NS2）;4 splits of total N, 1/4 at sowing, 1/4 at the 1st irrigation, 1/4 at the 2nd irrigation （45 DAS）, and 1/4 at the 3rd irrigation （70 DAS）（NS3）;and 4 splits of total N, 1/4 at the 1st irrigation, 1/4 at the 2nd irrigation, 1/4 at the 3rd irrigation, and 1/4 at the 4th irrigation （95DAS）（NS4） as sub plots. The results showed that the most pikes m-2, grains/spike, 1 000-grain weight, grain yield, and N use efifciency （NUE） were obtained at zero tillage, straw retained and 4 splits application of total N （i.e., at sowing 20, 45 and 70 d after sowing）. The results indicated that ZTsr with application of 200 kg N ha-1 in 4 equal splits viz. at sowing 20, 45 and 70 d after sowing is an appropriate strategy that enhanced wheat yield （7 436-7 634 kg ha-1） and N efifciency （28.6-29.5 kg kg-1） in rice-wheat system.

关键词： tillage residue management N split application wheat yield

Adsorption Properties of magnesium Phosphate Cement-based Adsorption materials for Lead Ions

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Adsorption Properties of Magnesium Phosphate Cement-based Ad...

作者： khan khalid 西南科技大学

学位级别：硕士

随着工业的迅速发展,各国的综合国力不断提高,同时也暴露出许多问题,例如环境问题。环境问题是近年来各国政府和人民特别关注的问题,尤其是重工业的发展引起的重金属离子污染严重影响了某些地区人民的生活和环境。重金属离子的处理方法... 详细信息

随着工业的迅速发展,各国的综合国力不断提高,同时也暴露出许多问题,例如环境问题。环境问题是近年来各国政府和人民特别关注的问题,尤其是重工业的发展引起的重金属离子污染严重影响了某些地区人民的生活和环境。重金属离子的处理方法包括传统的物理化学方法,例如化学沉淀,离子交换,电凝和膜分离,以及生物修复方法,例如植物吸收和微生物吸附。本研究采用的吸附法原理,首先制备磷酸镁水泥基吸附材料,并将吸附剂与重金属铅离子废液混合并振荡以模拟重金属离子的处理过程,从而使废水中重金属铅离子被吸附在其中,从而实现治理重金属污染的目的。与其他方法相比,该吸附方法具有操作简单,节约经济,受限条件少,二次污染少等优点。本研究主要研究磷酸镁水泥基吸附材料的结构性能和重金属铅离子的吸附特性,进行了以下实验:制备了具有不同m/P比的磷酸镁多孔吸附剂（混合的氧化镁和磷酸二氢钾,即m/P）,以及100 ml不同浓度的100 mg/P的铅离子废液。加入100mg/L,150mg/L,200mg/L,250mg/L,300mg/L。吸附时间为1天。实验结果表明,多孔磷酸镁吸附剂在重金属铜废液上的吸附量和吸附率随m/P的增加呈先升高后降低的趋势,当m/P=1,m/P=3。不同浓度下的最大吸附量不同,不同浓度下的最大吸附速率也不同,我们获得了最佳的结果。与二阶动力学方程一致的多孔磷酸镁吸附剂的拟合曲线几乎是笔直的,表明相似性较高。从动力学拟合参数看,多孔磷酸镁吸附剂对一阶动力学方程的拟合度为R2=0.7365,对二阶动力学方程的拟合度为R2=0.9981,因此化学吸附是主要的多孔磷酸镁吸附剂吸附铜废液的吸附方式。

关键词：磷酸镁水泥多孔材料铅离子吸附性能

Influence of Y^(3+),Yb^(3+),Gd^(3+) cations on structural and electromagnetic properties of CuFe_(2)O_(4) nanoferrites prepared via one step sol-gel method

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Journal of Rare Earths 2021年第10期39卷 1224-1231,I0003页

作者： Aleena Kiran majid Niaz Akhtar muhammad Yousaf khalid mujassam Batoo Omar mAldossary Salman Naeem khan Department of Physics COMSATS University IslamabadLahore CampusDefence Road Off RaiwindLahore54000Pakistan Department of Physics Mohammad Nawaz Sharif University of Engineering and TechnologyMultan60000Pakistan School of Energy and Environment Southeast UniversityNo2 Si Pai LouNanjing 210096China King Abdullah Institute for Nanotechnology King Saud UniversityP.O.Box 2455Riyadh11458Saudi Arabia Department of Physics and Astronomy College of ScienceKing Saud UniversityP.O.Box-2455Riyadh11451Saudi Arabia micro-mm Wave Laboratory(m2L) Department of PhysicsCOMSATS University IslamabadLahore CampusDefence Road Off RaiwindLahore54000Pakistan

Rare earths(REs) play a key role in distorting spinel structure by creating some defects at the lattice sites and make them suitable for magnetodielectric *** the present study,the nanoferrites of CuRE0.02Fe1.98O4,where REs=Y^(3+),Yb^(3+),Gd^(3+),were prepared using one step sol-gel *** prepared samples are copper ferrite(CFO),yttrium doped copper ferrite(Y-CFO),ytterbium doped copper ferrite(Yb-CFO) and gadolinium doped copper ferrite(Gd-CFO),*** single-phase structure of all the REs doped nanoferrites was determined by X-ray diffraction(XRD) *** porosity,agglomerations and grain size of the REs doped copper ferrite were examined using field emission scanning electron microscopy(FESEm) *** transform infrared spectroscopy(FTIR)elaborates the phase formation and environmental effects on the REs doped nanoparticles(NPs).The recorded room temperature m-H loops from a vibrating sample magnetometer(VSm) elucidate the magnetic properties of the REs doped spinel *** magnetic saturation(ms) was calculated in the range of 23.08 to 51.78 emu/*** calculated coercivity values(272.6 to 705.60 Oe) confirm the soft magnetic behavior of REs doped copper ***,the electromagnetic and dielectric properties were assessed using a Vector network analyzer(VNA) from 1 to 6 *** permeability,permittivity,dielectric tangent loss and electric modulus of the REs doped spinel ferrites illustrate that the prepared NPs may be suitable for microwave and high frequency applications.

关键词： Rare earth elements Nanoparticles Spinel ferrites VSm VNA magnetodielectric applications

Early Detection of Diabetic Retinopathy Using machine Intelligence throughDeep Transfer and Representational Learning

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Computers, materials & Continua 2021年第2期66卷 1631-1645页

作者： Fouzia Nawaz muhammad Ramzan khalid mehmood Hikmat Ullah khan Saleem Hayat khan muhammad Raheel Bhutta Department of Computer Science and Information Technology University of SargodhaSargodha40100Pakistan and School of Systems and TechnologyUniversity of Management and TechnologyLahore54782Pakistan Department of Computer Science COMSATS University IslamabadWah CampusIslamabadPakistan University Hospital Birmingham BirminghamUK Shifa International Hospital IslamabadPakistan Department of Computer Science and Engineering Sejong UniversitySeoulKorea

Diabetic retinopathy (DR) is a retinal disease that causes irreversible *** occurs due to the high blood sugar level of the patient, and it is clumsy tobe detected at an early stage as no early symptoms appear at the initial level. To preventblindness, early detection and regular treatment are needed. Automated detectionbased on machine intelligence may assist the ophthalmologist in examining thepatients’ condition more accurately and efficiently. The purpose of this study is toproduce an automated screening system for recognition and grading of diabetic retinopathyusing machine learning through deep transfer and representational *** artificial intelligence technique used is transfer learning on the deep neural network,Inception-v4. Two configuration variants of transfer learning are applied onInception-v4: Fine-tune mode and fixed feature extractor mode. Both configurationmodes have achieved decent accuracy values, but the fine-tuning method outperformsthe fixed feature extractor configuration mode. Fine-tune configuration modehas gained 96.6% accuracy in early detection of DR and 97.7% accuracy in gradingthe disease and has outperformed the state of the art methods in the relevant literature.

关键词： Diabetic retinopathy artificial intelligence automated screening system machine learning deep neural network transfer and representational learning

Enhanced photocatalytic activity of Ce-doped ZnO nanopowders synthesized by combustion method

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Journal of Rare Earths 2015年第3期33卷 255-262页

作者： m.Ahmad E.Ahmed Fezza Zafar N.R.khalid N.A.Niaz Abdul Hafeez m.Ikram m.Ajmal khan 洪樟连 Department of Physics Bahauddin Zakariya University State Key Laboratory of Silicon materials Department of Materials Science & Engineering Zhejiang University Science and Technology Division University of Education

Facile and fast combustion method was used to synthesize Zn O and Ce-doped Zn O（CZO） nanocrystalline powders photocatalysts with different cerium concentrations（0.5 wt.%–10.0 wt.%） followed by calcination at 700 oC for 3 h. The prepared samples were characterized by a variety of characterization techniques such as X-ray diffraction（XRD）, scanning electron microscopy（SEm） combined with energy dispersive X-ray diffraction（EDX）, transmission electron microscopy（TEm）, UV-visible spectroscopy, BET surface area analyser and photoluminescence spectroscopy（PL）, to study the crystal structure, surface morphology, chemical composition and optical properties. It was observed from XRD results that synthesized powders had hexagonal wurtzite structure with the smallest crystallite size about 13 nm. Absorption spectra showed that cerium doping enhanced the light absorption properties towards the visible light region. Photoluminescence spectra for Ce-doped Zn O samples exhibited relatively weak near band edge（NBE） emission peaks as compared to that of pristine Zn O. The photocatalytic activities of the prepared samples were evaluated by photocatalytic degradation of Rhodamine B（Rh B） under UV light and visible light（λ≥420 nm） irradiation. The textile mill effluent containing organic matters was also treated under sunlight using photocatalysis and the reduction in the chemical oxygen demand（COD） of the treated effluent revealed a complete destruction of the organic molecules along with colour removal. The results showed that the CZO photocatalyst doped with 3.0 wt.% cerium exhibited four times enhanced photocatalytic activity compared to pure Zn O. The enhanced photocatalytic activity could be attributed to extended visible light absorption and inhibition of the electron-hole pair＇s recombination.

关键词： ZnO cerium combustion photocatalyst Rhodamine B rare earths

Characteristic spectral studies and in vitro antifungal activity of some Schiff bases and their organotin (Ⅳ) complexes

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Chinese Science Bulletin 2004年第2期49卷 119-122页

作者： Wajid Rehman musa Kaleem Baloch Bakhtiar muhammad Amin Badshah khalid m.khan Department of Chemistry Gomal University Dera Ismail KhanPaki-stanDepartment of Chemistry Gomal UniversityDera Ismail KhanPaki-stanDepartment of Chemistry Gomal UniversityDera Ismail KhanPaki-stanDepartment of ChemistryQuaid-e-Azam UniversityIslamabadPaki-stanHEJ Research Institute University of KarachiPakistan

The synthesis and in vitro antifungal activity of some Schiff bases and their Sn (Ⅳ) complexes has been tested against plant pathogenic fungi and it is found that they possess excellent fungicidal activity. On the basis of ^1H-, ^13C-,^119Sn NmR-, ^119Sn mǒssbauer, IR and Elemental analysis the tetrahedral geometry is proposed for the synthesized compounds.

关键词：特征光谱抗真菌活性有机锡有机金属化合物

Effect of medium Acidity and Photostability of 3-（4-Dimethyl- amino-phenyl）-l-（2,5-dimethyl-thiophen-3-yl）-propenone （DDTP）： A New Green Emitting Laser Dye

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Chinese Journal of Chemistry 2011年第11期29卷 2557-2561页

作者： EI-Daly, Samy A Asiri, Abdullah m. khan, Salman A. Alamry, khalid A. Hussein, mahmoud A. Chemistry Department Faculty of Science King Abdulaziz University P.O. Box 80203 Jeddah 21589 Saudi Arabia Department of Chemistry Faculty of Science Tanta University 31527 Tanta Egypt The Center of ExcellenceforAdvanced materials King Abdul Aziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia Polymer Chemistry Lab Chemistry Department Faculty of Science Assiut University Assiut 71516 Egypt

On the line of a previous work on the spectral properties of some of heteroaryl chalcone, the effect of medium acidity and photoreactivity of 3-（4-dimethylamino-phenyl）-l-（2,5-dimethyl-thiophen-3-yl）-propenone （DDTP） has been investigated in dimethylformamide and in chloromethane solvents such as methylenechloride, chloroform and carbon tetrachloride. The dye solution （ca. 5×10^-4 mol·L^-1 in DmF） gives a good laser emission in the range 470 --560 nm with emission maximum at 515 nm upon pumping by nitrogen laser （λex=337.1 nm）. The laser parameters such as gain coefficient （a）, emission cross section （Cre） and half life energy （E1/2） at maximum laser emission are also determined.

关键词： 3-(4-dimethylamino-phenyl)-1-(2,5-dimethyl-thiophen-3-yl)-propenone laser dyes effect of acidity possibility