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A dynamic infiltration technique to synthesize nanolayered cathodes for high performance and robust solid oxide fuel cells

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Journal of Energy Chemistry 2022年第7期31卷 201-210,I0006页

作者： saeed ur rehman Ho-Seon Song Hye-Sung Kim Muhammad Haseeb Hassan Dong-Woo Joh Rak-Hyun Song Tak-Hyoung Lim Jong-Eun Hong Seok-Joo Park Seung-Bok Lee High Temperature Energy Conversion Laboratory Korea Institute of Energy Research152Gajeong-roYuseong-gu.Daejeon34129.Republic of Korea Department of Advanced Energy and System Engineering University of Science and Technology.217 Gajeong-ro.Yuseong-gu.Daejeon 34113.Republicof Korea

Solution infiltration is a popular technique for the surface modification of solid oxide fuel cell(SOFC)***,the synthesis of nanostructured SOFC cathodes by infiltration is a tedious process that often requires several infiltration and high temperature(≥500℃)calcination ***,fabricating large-area nanostructured cathodes via infiltration still requires serious ***,we propose a facile and scalable urea assisted ultrasonic spray infiltration technique for nanofabrication of SOFC *** is demonstrated that by using urea as a precipitating agent,the calcination after each infiltration cycle can be omitted and the next infiltration can be performed just after a drying step(≤100℃).Finally,the precipitates can be converted into a desired catalyst phase in single calcination thus,a nanostructured cathode can be fabricated in a much faster *** is also shown that the low calcination temperature of the cathode(≤900℃)can produce highly durable SOFC performance even without employing a Ce_(0.9)Gd_(0.1)O_(2)(GDC)diffusion barrier layer which provides the ease of SOFC *** coupling with an ultrasonic spray technique,the urea assisted infiltration can be scaled up for any desired cathode ***_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3) nanolayered cathode was fabricated and it was characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),and transmission electron microscopy(TEM)*** showed the formation of a nanolayer cathode just after 5 cycles of the urea assisted infiltration while the XRD and TEM confirmed the phase and stoichiometric uniformity of the 100 nm cathode *** effectiveness of the newly developed technique was further verified by the stable operation of a GDC buffer layer free SOFC having an active cathode area of 25 cm^(2) during a 1200 h durability *** research outcomes propose urea assisted ultrasonic spray infiltration as a facile,scalable,and commercially viable method

关键词： Solid oxide fuel cell(SOFC) Cathode Infiltration Nanolayer Nanofabrication GDC barrier layer free SOFC

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Non Planar Electrostatic Solitary Wave Structures in Negative Ion Degenerate Plasma

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Chinese Physics Letters 2011年第4期28卷 148-151页

作者： S.Hussain N.Akhtar saeed-ur-rehman Theoretical Plasma Physics Division PINSTECHNiloreIslamabad Department of Physics and Applied Mathematics PIEAS NiloreIslamabad

Theoretical and numerical studies are performed for quantum ion acoustic solitons in planar and non-planar geometries in an unmagnetized homogenous plasma consisting of warm positive and negative ions with nonthermal electrons.A deformed Korteweg de Vries(DKdV)equation is derived by using the reductive perturbation *** numerical solution to the DKdV equation indicates that the quantum parameter,temperatures of positive ions,temperture of negative ions and electron density blatantly influence the propagation speed and the structure of quantum ion acoustic *** geometrical effects on the structure of quantum ion acoustic wave are *** is shown that the amplitude and propagation speed in spherical geometry is larger as compared to cylinderical and planar geometries for different values of the above-mentioned parameters.

关键词： method quantum planar

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Bioassay studies of cobalt (Ⅱ) complexes of modified diamine

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中国化学前沿:英文版 2011年第2期6卷 98-104页

作者： saeed-ur-rehman Muhammad IKRAM Sadia rehman Shah NAWAZ Institute of Chemical Sciences University of PeshawarPeshawar 25120Pakistan

Coordination compounds of modified diamine,the basic unit of which are ethylenediamine,with that of Co(Ⅱ)are *** modified diamines are ethylenediaceticacid(EDDA)and N,N,N,N-tetaraethylene-1,2-diamine(TEEDA).These diamines are characterized through ^(1)H-NMR,^(13)C-NMR,elemental analysis and IR ***(Ⅱ)complexes of these two ligands were prepared and characterized by physical measurements including elemental analysis,IR,UVVisible,magnetic susceptibilities and conductance *** activities are also carried out in order to investigate the biological activity upon *** were screened against four pathogenic bacteria like Escherichia coli,Pseudomonas aeroginosa,Klesbella pneumonia and Staphylococcus *** results showed significant enhancement in activities.

关键词： EDDA TEEDA cobalt complexes antibacterial studies

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Ecological Characteristics of Plants of Harboi Rangeland, Kalat, Pakistan

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热带亚热带植物学报 2005年第2期13卷 130-138页

作者： Mufakhirah Jan DurRANI Farrukh HUSSAIN saeed-ur-rehman Department of Botany University of Balochistan Quetta PakistanDepartment of Botany University of Peshawar Peshawar PakistanDepartment of Botany University of Balochistan Quetta Pakistan

The floristic composition, ecological characteristics and ethnoecology of plants of Harboi rangeland (Kalat, Pakistan) were done during 1997 to 1999. There were 202 species that belonged to 45 plant families. Asteraceae, Papilionaceae, Poaceae, Brassicaceae and Lamiaceae were the leading families. Juniperus macropoda was the only tree species while Artemesia maritima, Sophora griffithii, Hertia intermedia, Nepeta juncea, Perovskia abrotanoides, Convolvulus leiocalycinus and Astragalus spp. were the most common shrubs. The dominant life forms were therophyte and hemicryptophyte while nanophylls, microphylls and leptophylls were dominant leaf sizes. The growing season lasts from March to November with two flowering periods. Most, i.e. 83.6% plants flowered during April to June while 63.3% plants bloomed during July to September. Some 145 species had various local uses. They included 129 fodder species, 50 medicinal species, 12 vegetable/fruits species, 7 fuel wood species, 3 species each were used for roof thatching and making herbal tea. Deforestation, over grazing and over collection of medicinal and fuel wood species have led to the degradation of this rangeland. There is need to conserve these resources with the participation of local communities.

关键词：巴基斯坦哈博伊草原植物生态特征

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铊在多壁碳纳米管上的吸附(英文)

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新型炭材料 2012年第6期27卷 409-415页

作者： saeed ur rehman Najeeb Ullah Ali Reza Kamali Khurshid Ali Cemile Yerlikaya Hanif ur rehman Institute of Chemical Sciences University of PeshawarPeshawarPakistan Department of Materials Science and Metallurgy University of CambridgePembroke StreetCambridge CB2 3QZUK Chemical Engineering Department Chemical and Metallurgical FacultyIstanbul Technical UniversityIstanbul 34469Turkey

多壁碳纳米管采用H2SO4,KMnO4,HNO3氧化处理后用于铊吸附研究。碳纳米管经处理后表面官能团增加,采用Bohmn滴定法确定了样品的表面官能团的量。当用于吸附铊时,氧化处理显著提高了其吸附能力。采用Langmuir方程进行拟合处理后获得原始... 详细信息

多壁碳纳米管采用H2SO4,KMnO4,HNO3氧化处理后用于铊吸附研究。碳纳米管经处理后表面官能团增加,采用Bohmn滴定法确定了样品的表面官能团的量。当用于吸附铊时,氧化处理显著提高了其吸附能力。采用Langmuir方程进行拟合处理后获得原始碳纳米管、H2SO4,KMnO4,HNO3氧化处理后样品的吸附量分别为3.0,11.7,21.6 and 31.55mg/g。HNO3处理后具有对铊最佳的吸附性能。

关键词：铊多壁碳纳米管吸附氧化

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The thermoanalytical, infrared and pyrolysis-gas chromatography-mass spectrometric sifting of poly (methyl methacrylate) in the presence of phosphorus tribromide

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Natural Science 2010年第4期2卷 307-319页

作者： Muhammad Arshad Khalid Masud Muhammad Arif saeed-ur rehman Jamshed H. Zaidi Muhammad Arif Aamer saeed Tariq Yasin 不详

The behaviour of poly(methyl methacrylate) was examined in the presence of phosphorus tri-bromide (PBr3) with varying concentrations. Films were cast from common solvent and subjected to TG, DTA, DTG, IR and Py-GC-MS for evaluating the degradation routes. Despite early decomposition of the blends, certain tempera-ture zones were identified for stabilization of the system. New products were found and mecha-nisms of their formation were proposed. Pyro-lysis of the blends was also carried out at dif-ferent temperatures to ascertain the nature of interaction between the constituents of the system.

关键词： PMMA PBr3 Thermoanalytical Study IR Spectroscopy GC-MS Investigation

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Human Detection under Non-controlled Environments

Human Detection under Non-controlled Environments

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第16届中国系统仿真技术及其应用学术会议

作者： Jamal Hussain Shah Chen Zong-hai Mudassar Raza saeed ur rehman Zhang Chen-bin Department of Automation University of Science and Technology of China

Real time object tracking commonly suffers from various real life problems like varying pose,occlusion and *** this paper,the illumination problem is handled that highly influences the quality of people *** main focus is to eliminate the lighting effect and increase the success ratio in *** proposed system removes the noise from single-scale retinex（SSR） image via linear smoothing filter which in fact segregates the actual features from illumination *** addition,we extend processed images with original histogram of oriented gradients（HOG） based detector and local binary patterns（LBP） for training to classify the negative and positive ***,we utilized support vector machine（SVM） for classification *** results show that the proposed method have more accuracy as compared to original HOG+SVM method.

关键词： Single-scale Retinex(SSR) Histogram of Oriented Gradient(HOG) Local Binary Patterns(LBP) Support Vector Machine(SVM) Human Detection

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An Efficient Automated Technique for Classification of Breast Cancer Using Deep Ensemble Model

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Computer Systems Science & Engineering 2023年第7期46卷 897-911页

作者： Muhammad Zia ur rehman Jawad Ahmad Emad Sami Jaha Abdullah Marish Ali Mohammed A.Alzain Faisal saeed Department of Electrical Engineering HITEC UniversityTaxila47080Pakistan School of Computing Edinburgh Napier UniversityEdinburghEH105DTUK Department of Computer Science Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Information Technology College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia DAAI Research Group Department of Computing and Data ScienceSchool of Computing and Digital TechnologyBirmingham City University15 Bartholomew RowBirminghamB55JUUK

Breast cancer is one of the leading cancers among *** has the second-highest mortality rate in women after lung *** detection,especially in the early stages,can help increase survival ***,manual diagnosis of breast cancer is a tedious and time-consuming process,and the accuracy of detection is reliant on the quality of the images and the radiologist’s ***,computer-aided medical diagnosis has recently shown promising results,leading to the need to develop an efficient system that can aid radiologists in diagnosing breast cancer in its early *** research presented in this paper is focused on the multi-class classification of breast *** deep transfer learning approach has been utilized to train the deep learning models,and a pre-processing technique has been used to improve the quality of the ultrasound *** proposed technique utilizes two deep learning models,Mobile-NetV2 and DenseNet201,for the composition of the deep ensemble *** learning models are fine-tuned along with hyperparameter tuning to achieve better ***,entropy-based feature selection is *** cancer identification using the proposed classification approach was found to attain an accuracy of 97.04%,while the sensitivity and F1 score were 96.87%and 96.76%,*** performance of the proposed model is very effective and outperforms other state-of-the-art techniques presented in the literature.

关键词： Breast cancer image enhancement ensemble model transfer learning feature selection

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Detection of Copy-Move Forgery in Digital Images Using Singular Value Decomposition

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Computers, Materials & Continua 2023年第2期74卷 4135-4147页

作者： Zaid Nidhal Khudhair Farhan Mohamed Amjad rehman Tanzila Saba saeed Ali bahaj Faculty of Engineering School of ComputingUniversity Technology of MalaysiaJohar BahruMalaysia UTM-IRDA MaGICX Institute of Human Centered EngineeringUniversiti Teknologi MalaysiaMalaysia Artificial Intelligence&Data Analytics Lab CCIS Prince Sultan University Riyadh Saudi Arabia Computer Techniques Engineering Department Faculty of Information TechnologyImam Ja’afar Al-Sadiq UniversityBaghdadIraq

This paper presents an improved approach for detecting copy-move forgery based on singular value decomposition(SVD).It is a block-based method where the image is scanned from left to right and top to down by a sliding window with a determined *** each step,the SVD is ***,the diagonal matrix’s maximum value(norm)is selected(representing the scaling factor for SVD and a fixed value for each set of matrix elements even when rotating thematrix or scaled).Then,the similar norms are grouped,and each leading group is separated into many subgroups(elements of each subgroup are neighbors)according to 8-adjacency(the subgroups for each leading group must be far from others by a specific distance).After that,a weight is assigned for each subgroup to classify the image as forgery or ***,the F1 score of the proposed system is measured,reaching 99.1%.This approach is robust against rotation,scaling,noisy images,and illumination *** is compared with other similarmethods and presents very promised results.

关键词： Forgery image forensic image processing region duplication SVD transformation technological development

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Finger Vein Authentication Based on Wavelet Scattering Networks

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Computers, Materials & Continua 2022年第8期72卷 3369-3383页

作者： Amjad rehman Majid Harouni Maedeh Omidiravesh Suliman Mohamed Fati saeed Ali Bahaj Artificial Intelligence&Data Analytics Lab CCIS Prince Sultan UniversityRiyadh11586Saudi Arabia Department of Computer Engineering Dolatabad BranchIslamic Azad UniversityIsfahanIran Faculty of Computer Engineering Najafabad BranchIslamic Azad UniversityIsfahanIran MIS Department College of Business Administration Prince Sattam bin Abdulaziz UniversityAlkharj11942Saudi Arabia

Biometric-based authentication systems have attracted more attention than traditional authentication techniques such as passwords in the last two *** biometrics such as fingerprint,palm,iris,palm vein and finger vein and other biometrics have been *** of the challenges in biometrics is physical *** of finger vein is of the biometrics least exposed to physical *** methods have been proposed for authentication with the help of this biometric that suffer from weaknesses such as high computational complexity and low identification *** paper presents a novel method of scattering wavelet-based identity *** wavelet extracts image features from Gabor wavelet filters in a structure similar to convolutional neural *** distinguishes this algorithm from other popular feature extraction methods such as deep learning methods,filter-based methods,statistical methods,etc.,is that this algorithm has very high skill and accuracy in differentiating similar images but belongs to different classes,even when the image is subject to serious damage such as noise,angle changes or pixel location,this descriptor still generates feature vectors in away thatminimizes classifier *** improves classification and *** proposed method has been evaluated using two databases Finger Vein USM(FV-USM)and Homologous Multimodal biometrics Traits(SDUMLA-HMT).In addition to having reasonable computational complexity,it has recorded excellent identification rates in noise,rotation,and transmission *** best,it has a 98.2%identification rate for the SDUMLA-HMT database and a 96.1%identification rate for the FV-USM database.

关键词： Biometrics finger veins wavelet scattering vein authentication disaster risk reduction

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