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Strong interfacial charge transfer between hausmannite manganese oxide and alumina for efficient photocatalysis

Chinese Journal of Chemical Engineering 2021年第5期34卷 147-159页

作者： Aisha Kanwal Shamaila sajjad sajjad ahmed khan leghari Muhammad Naeem khan International Islamic University H-10 IslamabadPakistan Pakistan Institute of Engineering and Applied Sciences Islamabad 44000Pakistan Department of Chemistry Government College of ScienceLahorePakistan

Well crystalline manganese oxide(Mn_(3)O_(4))nanoparticles anchored on gamma alumina(γ-Al_(2)O_(3))have been successfully tailored via a proficient and cost effective chemical process as an efficient material for photo *** indicated the composite formation ofγ-Al_(2)O_(3) and hausmannite structure of Mn_(3)O_(4).SEM and TEM revealed that hetero structure of Mn_(3)O_(4)/γ-Al_(2)O_(3) exhibits an amalgam of aggregated nanoparticles and *** demonstrated the chemical states of binary *** band gap tuning has been performed withγ-Al_(2)O_(3) nanoparticles by assimilating hausmannite Mn_(3)O_(4) particles into flower like microstructure of Al_(2)O_(3).The photoluminescence spectra affirmed the enhancement in charge separation in Mn_(3)O_(4)/γ-Al_(2)O_(3) binary hybrid *** band gap becomes narrow with the increase in concentrations of Mn_(3)O_(4).The narrowing of band gap is concorded with crystalline domains of primary aggregated *** elucidate the mechanism of the photocatalytic activity linear sweep voltammetry was *** results showed that Mn_(3)O_(4)/γ-Al_(2)O_(3) nanocomposite revealed the enhancement in current density as compared to pureγ-Al_(2)O_(3) which confirmed the electron transfer from Mn_(3)O_(4) toγ-Al_(2)O_(3) through the interfacial potential gradient in conduction *** optimum concentration of 6.0%Mn_(3)O_(4)/γ-Al_(2)O_(3) for hybrid structure showed an excellent photocatalytic activity under visible light due to narrow band gap *** degree distribution of Mn_(3)O_(4) nano architects overlying onγ-Al_(2)O_(3) induces a significant synergic effect betweenγ-Al_(2)O_(3) and hausmannite phase of manganese oxide(Mn_(3)O_(4)).This strong interfacial contact betweenγ-Al_(2)O_(3) and Mn_(3)O_(4) endures the quick transfer of photo generated charge carriers across interface.

关键词： Hausmannite Mn_(3)O_(4) Alumina Band gap tuning Interfacial charge transfer Nanomaterials Catalysis

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Competitive role of nitrogen functionalities of N doped GO and sensitizing effect of Bi_(2)O_(3)QDs on TiO_(2)for water remediation

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Journal of Environmental Sciences 2021年第10期33卷 107-119页

作者： Saima Noor Shamaila sajjad sajjad ahmed khan leghari Cristina Flox Saeed Ahmad International Islamic University Islamabad 44000Pakistan Department of Chemistry and Materials Science Aalto UniversityEspoo 16100Fl-00076Finland Pakistan Institute of Engineering and Applied Sciences Islamabad 44000Pakistan Department of Applied Physics Aalto UniversityEspoo 15100Fl-00076Finland

The promising solar irradiated photocatalyst by pairing of bismuth oxide quantum dots(BQDs)doped TiO_(2)with nitrogen doped graphene oxide(NGO)nanocomposite(NGO/BQDs-TiO_(2))was *** was used for degradation of organic pollutants like 2,4-dichlorophenol(2,4-DCP)and stable dyes,*** B and Congo Red.X-ray diffraction(XRD)profile of NGO showed reduction in oxygenic functional groups and restoring of graphitic crystal *** characteristic diffraction peaks of TiO_(2)and its composites showed crystalline anatase TiO_(2).Morphological images represent spherical shaped TiO_(2)evenly covered with BQDs spread on NGO *** surface linkages of NO-O-Ti,C-O-Ti,Bi-O-Ti and vibrational modes are observed by Fourier transform infrared spectroscopy(FTIR)and Raman *** and NGO modified TiO_(2)results into red shifting in visible region as studied in diffused reflectance spectroscopy(DRS).NGO and BQDs in TiO_(2)are linked with defect centers which reduced the recombination of free charge carriers by quenching of photoluminescence(PL)intensities.X-ray photoelectron spectroscopy(XPS)shows that no peak related to C-O in NGO/BQDs-TiO_(2)is *** indicated that doping of nitrogen into GO has reduced some oxygen functional *** functionalities in NGO and photosensitizing effect of BQDs in ternary composite have improved photocatalytic activity against organic *** byproducts during photo degradation process of 2,4-DCP were studied through high performance liquid chromatography(HPLC).Study of radical scavengers indicated that O_(2)^(·-) has significant role for degradation of 2,*** investigations propose that fabricated nanohybrid architecture has potential for degradation of environmental pollutions.

关键词： Bi_(2)O_(3)quantum dots Nitrogen doped graphene oxide Nitrogen defects TiO_(2) 2,4-Dichlorophenol Water treatment

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Analysis of cerium substitution in Co-Sr based spinel ferrites for high frequency application

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Journal of Rare Earths 2024年第9期42卷 1755-1763页

作者： Laura Khudaysh Inas A.ahmed Syeda Rabia Ejaz sajjad Ahmad khan Yasir A.Haleem Mohamed M.Ibrahim Mahmood Ali Hafiz Muhammad Tahir Farid Zeinhom M.El-Bahy Department of Physics Faculty of ScienceJazan University Department of Chemistry Faculty of ScienceKing Khalid University Department of Physics The Government Sadiq College Women University Institute of Physics Khwaja Fareed University of Engineering and Information Technology Department of Chemistry College of ScienceTaif University Centre of Excellence in Solid State Physics University of the Punjab Department of Physics Government College Department of Chemistry Faculty of ScienceAl-Azhar University

Spinel ferrites exhibit exceptional magnetic properties,making them a distinctive class of magnetic *** sol-gel technique was utilized for the synthesis of spinel ferrites with the chemical formula Co0.6Sr0.4CexFe2-xO4. Following that,a comprehensive X-ray diffraction analysis unveiled the crystalline cubic structure of the synthesized *** the utilization of the M-H loop approach,the ferromagnetic attributes of ferrites were assessed,and the assimilation of rare earth elements led to substantial enhancements in saturation magnetization,remanence,and *** ferrites with a high concentration of rare earth elements have improved direct current resistivity and activation *** logarithm of a material's resistance increased from 5.29 to 8.12 Ω·cm as cerium is *** a change in the amount of cerium,the activation energy goes up from 0.19 to *** changing the frequency from 5.5 to 9.5 GHz,the dielectric characteristics were *** the frequency goes up,the dielectric constant goes *** ferrites that have been made better in every way can be used in high-frequency applications.

关键词： Activation energy DC electrical resistance Remanence magnetization Cobalt strontium spinel ferrites High frequency application Rare earths

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Reconfigurable Sensing Time in Cooperative Cognitive Network Using Machine Learning

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Computers, Materials & Continua 2023年第3期74卷 5209-5227页

作者： Noor Gul Saeed ahmed Su Min Kim Muhammad sajjad khan Junsu Kim Department of Electronics Engineering Korea Polytechnic UniversityGyeonggi-do15073Korea Department of Electronics University of PeshawarPeshawar25120Pakistan Deparment of Electrical Engineering Mirpur University of Science of TechnologyAJ&KMirpur10250Pakistan Department of Electrical Engineering International Islamic UniversityIslamabad44000Pakistan

A cognitive radio network(CRN)intelligently utilizes the available spectral resources by sensing and learning from the radio environment to maximize spectrum *** CRNs,the secondary users(SUs)opportunistically access the primary users(PUs)***,unambiguous detection of the PU channel occupancy is the most critical aspect of the operations of *** spectrum sensing(CSS)is rated as the best choice for making reliable sensing *** paper employs machinelearning tools to sense the PU channels reliably in *** sensing parameters are reconfigured to maximize the spectrum utilization while reducing sensing error and cost with improved channel *** fine-k-nearest neighbor algorithm(FKNN),employed in this paper,estimates the number of samples based on the nature of the channel under-specific detection and false alarm probability *** simulation results reveal that the sensing cost is suppressed by reducing the sensing time and exploiting the traditional fusion rules,validating the effectiveness of the proposed ***,the global decision made at the fusion center(FC)based on the modified sensing samples,results low energy consumption,higher throughput,and improved detection with low error probabilities.

关键词： Energy detection machine learning k-nearest-neighbor decision tree linear regression throughput energy consumption

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Reinforcing Artificial Neural Networks through Traditional Machine Learning Algorithms for Robust Classification of Cancer

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Computers, Materials & Continua 2023年第5期75卷 4293-4315页

作者： Muhammad Hammad Waseem Malik sajjad ahmed Nadeem Ishtiaq Rasool khan Seong-O-Shim Wajid Aziz Usman Habib Department of Computer Sciences and Information Technology University of Azad Jammu and KashmirMuzaffarabad13100Pakistan Department of Computer Science and AI College of Computer Science and EngineeringUniversity of JeddahJeddah23890Saudi Arabia Department of Computer and Network Engineering College of Computer Science and EngineeringUniversity of JeddahJeddah23890Saudi Arabia Department of AI&DS School of ComputingNational University of Computer and Emerging SciencesIslamabad44000Pakistan

Machine Learning(ML)-based prediction and classification systems employ data and learning algorithms to forecast target ***,improving predictive accuracy is a crucial step for informed *** the healthcare domain,data are available in the form of genetic profiles and clinical characteristics to build prediction models for complex tasks like cancer detection or *** ML algorithms,Artificial Neural Networks(ANNs)are considered the most suitable framework for many classification *** network weights and the activation functions are the two crucial elements in the learning process of an *** weights affect the prediction ability and the convergence efficiency of the *** traditional settings,ANNs assign random weights to the *** research aims to develop a learning system for reliable cancer prediction by initializing more realistic weights computed using a supervised setting instead of random *** proposed learning system uses hybrid and traditional machine learning techniques such as Support Vector Machine(SVM),Linear Discriminant Analysis(LDA),Random Forest(RF),k-Nearest Neighbour(kNN),and ANN to achieve better accuracy in colon and breast cancer *** system computes the confusion matrix-based metrics for traditional and proposed *** proposed framework attains the highest accuracy of 89.24 percent using the colon cancer dataset and 72.20 percent using the breast cancer dataset,which outperforms the other *** results show that the proposed learning system has higher predictive accuracies than conventional classifiers for each dataset,overcoming previous research ***,the proposed framework is of use to predict and classify cancer patients ***,this will facilitate the effective management of cancer patients.

关键词： ANN decision support systems gene-expression data hybrid classification machine learning predictive analytics

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Classification of Citrus Plant Diseases Using Deep Transfer Learning

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Computers, Materials & Continua 2022年第1期70卷 1401-1417页

作者： Muhammad Zia Ur Rehman Fawad ahmed Muhammad Attique khan Usman Tariq sajjad Shaukat Jamal Jawad Ahmad Iqtadar Hussain Department of Electrical Engineering HITEC UniversityTaxilaPakistan Department of Computer Science HITEC UniversityTaxilaPakistan College of Computer Engineering and Sciences Prince Sattam Bin Abdulaziz UniversityAl-KhrajSaudi Arabia Department of Mathematics College of ScienceKing Khalid UniversityAbhaSaudi Arabia School of Computing Edinburgh Napier UniversityUK Department of Mathematics Statisticsand PhysicsQatar UniversityDoha2713Qatar

In recent years,the field of deep learning has played an important role towards automatic detection and classification of diseases in vegetables and *** in turn has helped in improving the quality and production of vegetables and *** fruits arewell known for their taste and nutritional *** are one of the natural and well known sources of vitamin C and planted *** are several diseases which severely affect the quality and yield of citrus *** this paper,a new deep learning based technique is proposed for citrus disease *** different pre-trained deep learning models have been used in this *** increase the size of the citrus dataset used in this paper,image augmentation techniques are ***,to improve the visual quality of images,hybrid contrast stretching has been *** addition,transfer learning is used to retrain the pre-trainedmodels and the feature set is enriched by using feature *** fused feature set is optimized using a meta-heuristic algorithm,the Whale Optimization Algorithm(WOA).The selected features are used for the classification of six different diseases of citrus *** proposed technique attains a classification accuracy of 95.7%with superior results when compared with recent techniques.

关键词： Citrus plant disease classification deep learning feature fusion deep transfer learning

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Use of Scrapped Rubber Tires for Sustainable Construction of Manhole Covers

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Journal of Renewable Materials 2021年第5期9卷 1013-1029页

作者： Sadaqat Ullah khan Afzal ahmed sajjad Ali Ayesha Ayub ahmed Shuja Muhammad Ahsan Shahid Department of Urban and Infrastructure Engineering NED University of Engineering and TechnologyKarachi75270Pakistan Department of Civil Engineering NED University of Engineering and TechnologyKarachi75270Pakistan

Scrapped tires from vehicles are produced in large quantities. Despite numerous existing uses of scrapped tires, alarge quantity ends up at the landfill sites, which contributes to environmental degradation. The development ofmore applications of scrapped tire usage can reduce the disposal of tires at landfill sites. This research proposes anovel use of scrapped tires by using the strips taken from scrapped tires in replacement of steel bars as reinforcement. Manhole covers were produced using scrapped tires by completely replacing the steel with scrapped *** different samples of manhole covers were prepared and tested. The highest bearing capacity of 25.5 kN wasrecorded with a sample of 100 mm thickness made with cementitious composite, which is 2.25 times higher thanthe bearing capacity of a conventional reinforced-concrete manhole cover. The use of manhole covers made withscrapped tires can effectively address the theft issue of manhole covers. The lifecycle cost analysis shows that themanhole cover made with scrapped tires is 3.4 times more cost-effective in comparison with the conventionalmanhole cover. This research shows a new avenue of the potential use of scrapped tires as reinforcement in structures, which can improve sustainable construction practices.

关键词： Scrapped tires sustainability manhole cover waste management recycling

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Assessment of Biochemical and Antioxidative Status in Patients Suffering from Dengue Fever

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2015年第3期35卷 411-418页

作者： Mahmood Rasool Arif Malik Khalid Mahmud khan Muhammad Saeed Qureshi Beenish Shabbir Sara Zahid Muhammad Asif Abdul Manan Sana Rashid Saima Rubab khan Hafiz Muhammad Arsalan Rabail Alam Mahwish Arooj Mahmood Husain Qazi Adeel Gulzar ahmed Chaudhary Adel Mohammed Abuzenadah Mohammed Hussain Al-Qahtani sajjad Karim Center of Excellence in Genomic Medicine Research Faculty of Applied Medical SciencesKing Abdulaziz University Institute of Molecular Biology and Biotechnology the University of Lahore Fatima Jinnah Medical College Sir Gangaram Hospital Lahore Institute of Molecular Biology and Biotechnology the University of Lahore Department of Biotechnology and Informatics BUITEMS Quetta 87300 Pakistan Center for Research in Molecular Medicine the University of Lahore KACST Technology Innovation Center in Personalized Medicine King Abdulaziz University Center of Excellence in Genomic Medicine Research Faculty of Applied Medical Sciences King Abdulaziz University

Summary：A multi-centred study was designed to collect dengue epidemiologic data from government and registered private hospitals/clinics and maintained archive of frozen specimens in bio-bank to be used for future dengue epidemic control program, and assess the epidemiology of dengue fever（DF） by evaluating biochemical and oxidative status of patients. ELISA Ig M antibodies test was done to confirm DF. From August 2010 to December 2011, 101 confirmed blood samples of DF patients referred to pathology lab of Jinnah Hospital Lahore were subjected to the epidemiologic assessment by evaluating the biochemical and physiological indices and alterations of circulating antioxidants. Clinical features of DF patients and effect of fever on blood components and serum proteins of liver were recorded. The hospital stay in DF, dengue hemorrhagic fever（DHF） and dengue shock syndrome（DSS） showed significant difference. Significant increases in serum alanine amino transferase（ALT）（P=0.000）, aspartate amino transferase（AST）（P=0.000）, alkaline phosphatase（ALP）（P=0.000）, malondialdehyde（MDA） along with significant decreases in total protein（TP）（P=0.000）, reduced glutathione（GSH）（P=0.000）, superoxide dismutase（SOD）, catalase（CAT）（P=0.000）, and sialic acid contents（P=0.016） were observed. A positive correlation existed between bound sialic acid levels, liver enzymes and circulating antioxidants（r=0.656, P=0.016）. In the present study, alterations of circulating antioxidants in DF suggest that DF might be a metabolic response to an acute, self-limiting tropical viral infection, and a consequence of the viral inflammatory process.

关键词： dengue fever alanine amino transferase aspartate amino transferase malondialdehyde superoxide dismutase catalase

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Differential gene expression of chemokines in KRAS and BRAF mutated colorectal cell lines:Role of cytokines

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World Journal of Gastroenterology 2014年第11期20卷 2979-2994页

作者： sajjad khan Silke Cameron Martina Blaschke Federico Moriconi Naila Naz Ahmad Amanzada Giuliano Ramadori Ihtzaz ahmed Malik Clinic of Gastroenterology and Endocrinology University Medical CenterRobert-Koch-Str. 4037075 GoettingenGermany

AIM:To study KRAS/BRAF mutations in colorectalcancer(CRC)that influences the efficacy of *** develop strategies for overcoming combination of ***:Five colonic cell-lines were investigated:DLD-1 with KRAS(G13D)mutation,HT 29 and Colo205 with BRAF(V600E)mutation as well as the wild type(Wt)cell-lines Caco2 and ***-1(KRAS),HT-29(BRAF)and Caco2(Wt)cell lines were treated with cytokines(TNFα50 ng,IL-1β1 ng and IFNγ50ng)and harvested at different time points(1-24 h).KRAS inhibition was performed by the *** colorectal cancer cells DLD-1 and Caco2 were used for KRAS *** 70%confluency were confirmed before transfection with small interferring RNA(siRNA)*** the synthetic siRNA sequences were designed in our *** RNA and protein was isolated from the cells for RT-PCR and Western *** of the Western blotting was analyzed with the Image J software(NIH).Results are shown as mean±***:RT-PCR analysis in non-stimulated cells showed a low basal expression of TNFαand IL-1βin the DLD-1 KRAS-mutated cell-line,compared to Caco2wild *** detection was found for IL-6 and IFNγin any of the studied cell *** contrast,pro-angiogenic chemokines(CXCL1,CXCL8)showed a high constitutive expression in the mutated cell-lines DLD-1(KRAS),HT-29 and Colo205(BRAF),compared to wild type(Caco2).The anti-angiogenic chemokine(CXCL10)showed a high basal expression in wild-type,compared to mutated *** down-regulation by siRNA showed a significant decrease in CXCL1 and CXCL10gene expression in the DLD-1(KRAS)cell-line in comparison to wild type(Caco2)at 72 h after KRAS *** contrast,the specific KRAS inhibition resulted in an up-regulation of CXCL1 and *** results of our study show a higher expression of pro-angiogenic chemokines at basal level in mutated cell-lines,which was further increased by cytokine ***:To summarize,basal chemokine gene expres

关键词： Colorectal-cancer KRAS BRAF CXCL1(GROα) CXCL10(IP-

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药用植物内生菌对作物生长及氧化应激的作用（英文）

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2017年第2期18卷 125-137页

作者： Abdul Latif khan Syed Abdullah GILANI Muhammad WAQAS Khadija AL-HOSNI Salima AL-KHIZIRI Yoon-Ha KIM Liaqat ALI Sang-Mo KANG sajjad ASAF Raheem SHAHZAD Javid HUSSAIN In-Jung LEE ahmed AL-HARRASI UoN Chair of Oman's Medicinal Plants & Marine Natural Products University of Nizwa Nizwa 616 Oman Department of Biological Sciences & Chemistry University of Nizwa Nizwa 616 Oman School of Applied Biosciences Kyungpook National University Daegu 702-701 Korea Department of Agriculture Abdul Wali Khan University Mardan Mardan 23200 Pakistan Division of Plant Sciences University of Missouri Columbia MO 65211 USA

目的:探讨药用植物内生菌的多样性及其在种子生长和氧化应激中的作用。方法:从三种药用植物(Caralluma acutangula、Rhazya stricta和Moringa peregrina)中提取内生菌;基于18S r DNA测序和系统发育分析鉴定分离得到的内生菌株;以正常和... 详细信息

目的:探讨药用植物内生菌的多样性及其在种子生长和氧化应激中的作用。方法:从三种药用植物(Caralluma acutangula、Rhazya stricta和Moringa peregrina)中提取内生菌;基于18S r DNA测序和系统发育分析鉴定分离得到的内生菌株;以正常和矮化突变体水稻品系为对照,比较不同浓度的内生菌培养滤液(CF)对水稻种子的发芽和生长的影响;通过气相色谱-质谱分析CF中的有效活性成分。结论:从药用植物中共获得10种内生菌,包括茎点霉属6株、链格孢属2株、双极霉属1株和枝孢霉属1株。CF表现出剂量依赖性的生长刺激和抑制作用。与对照和其他内生菌相比,100%的茎点霉菌CF显著促进了水稻种子的发芽和生长;双极霉中的吲哚乙酸含量最高,并表现出比其更高的自由基清除和抗脂质过氧化活性;双极霉菌和茎点霉菌的类黄酮和酚类成分较高。综上所述,药用植物中存在内生菌株,其可以用于改善作物生长和减轻氧化应激。

关键词：真菌内生菌多样性药用植物抗氧化剂吲哚乙酸

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