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On the Approximation of Fractal-Fractional Differential Equations Using Numerical Inverse Laplace Transform Methods

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 2743-2765页

作者： kamran Siraj Ahmad Kamal Shah Thabet Abdeljawad Bahaaeldin Abdalla Department of Mathematics Islamia College PeshawarKhyber Pakhtoon KhwaPeshawar25120Pakistan Department of Mathematics and Sciences Prince Sultan UniversityP.O.Box 66833Riyadh11586Saudi Arabia Department of Mathematics University of MalakandChakdara Dir(L)Khyber Pakhtunkhwa18000Pakistan Department of Medical Research China Medical UniversityTaichung40402Taiwan

Laplace transform is one of the powerful tools for solving differential equations in engineering and other science *** the Laplace transform for solving differential equations,however,sometimes leads to solutions in the Laplace domain that are not readily invertible to the real domain by ***,we need numerical inversionmethods to convert the obtained solution fromLaplace domain to a real *** this paper,we propose a numerical scheme based on Laplace transform and numerical inverse Laplace transform for the approximate solution of fractal-fractional differential equations with orderα,β.Our proposed numerical scheme is based on three main ***,we convert the given fractal-fractional differential equation to fractional-differential equation in Riemann-Liouville sense,and then into Caputo ***,we transformthe fractional differential equation in Caputo sense to an equivalent equation in Laplace *** the solution of the transformed equation is obtained in Laplace ***,the solution is converted into the real domain using numerical inversion of Laplace *** inversion methods are evaluated in this paper,and their convergence is also *** test problems are used to validate the inversion *** demonstrate our results with the help of tables and *** obtained results show that Euler’s and Talbot’s methods performed better than Stehfest’s method.

关键词： Fractal-fractional differential equation power law kernel exponential decay kernel Mittag-Leffler kernel Laplace transform Euler’s method Talbot’s method Stehfest’s method

Determination of multiaxial stress rupture criteria for creeping materials:A critical analysis of different approaches

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Journal of Materials Science & Technology 2023年第6期137卷 14-25页

作者： Kun Zhang Jian-Ping Tan Wei Sun kamran Nikbin Shan-Tung Tu Key Laboratory of Pressure Systems and Safety(Ministry of Education) School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai200237China Department of Mechanical Materials and Manufacturing EngineeringUniversity of NottinghamNottinghamNG72RDUK Department of Mechanical Engineering Imperial College LondonLondonSW72AZUK

Materials in engineering applications are rarely *** reality,failures under multiaxial loading has been widely observed in engineering *** life prediction of a component under multiaxial stresses has long been a challenging issue,particularly for high temperature *** distinguish the mode of failure ranging from a maximum principal stress intergranular damage to von Mises effective stress rupture mode a multiaxial stress rupture criterion(MSRC)was originally proposed by Sdobyrev and then Hayhurst and Leckie(SHL MSRC).A multiaxial-factor,α,was developed as a result which was intended to be a material constant and differentiates the bias of the MSRC between maxi-mum principal stress and effective *** success of the SHL MSRC relies on accurately calibrating the value ofαto quantify the multiaxial response of the material/geometry *** find a more suitable approach for determining MSRC,the applicability of different methods are *** that the resulting analysis of the various approaches can be affected by the creep failure mechanism,princi-ples in the determination of MSRC with and without using continuum damage mechanics approaches are *** viability of uniaxial material parameters in correlating withαthrough the analysis of available data in literature is also *** is found that the increase of the uniaxial creep dam-age tolerance parameterλis accompanied bythe decreaseof theα-value,whichimplies thatthe creep ductility plays an important role in affecting the multiaxial rupture behavior of materials.

关键词： Multiaxial stress rupture criterion Creep failure mechanism Uniaxial parameter Creep damage tolerance parameter Continuum damage mechanics

A Machine Learning Approach for Early COVID-19 Symptoms Identification

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Computers, Materials & Continua 2022年第2期70卷 3803-3820页

作者： Omer Ali Mohamad Khairi Ishak Muhammad kamran Liaquat Bhatti School of Electrical and Electronic Engineering Universiti Sains Malaysia(USM)Nibong Tebal14300PenangMalaysia Department of Electrical Engineering NFC Institute of Engineering and Technology(NFC IET)Multan60000Pakistan

Symptom identification and early detection are the first steps towards a health condition ***-19 virus causes pneumonialike symptoms such as fever,cough,and shortness of ***-19 contraction tests necessitate extensive clinical protocols in medical *** studies help with the accurate analysis of COVID-19,where the virus has already spread to the lungs in most *** majority of existing supervised machine learning-based disease detection techniques are based on clinical data like x-rays and computerized *** is heavily reliant on a larger clinical study and does not emphasize early symptom *** aim of this study is to investigate anomalies in patient physiological data for early COVID-19 symptoms *** this context,two of the most prevalent symptoms,fever and cough,were examined in a two-fold manner utilizing an unsupervised machine *** examine disease progression,physiological features from a chest-worn device were ***,a Single Vector Activity Index(SVAI)parameter is proposed to monitor the breathing and cough ***,the dataset’s variance is examined using the DBSCAN method for clustering and outlier ***,the model accuracy is evaluated to identify outliers on real-time data based on feature dissimilarities,yielding an overall detection accuracy of 90.34%.

关键词： COVID-19 symptoms identification machine learning dbscan

Common Pitfalls of Reporting Electrocatalysts for Water Splitting

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Chemical Research in Chinese Universities 2020年第3期36卷 360-365页

作者： WANG Yuan ARANDIYAN Hamidreza DASTAFKAN kamran LI Yibing ZHAO Chuan School of Chemistty Faculty of ScienceThe University of New South WalesSydneyNew South Wales 2052Australia Laboratory of Advanced Catalysis for Sustainability School of ChemistryThe University of SydneySydney 2006Australia

Rigorous assessment of heterogeneous electrocatalysts for electrochemical water splitting has been a critical issue mainly due to insufficient standard protocols to measure and report experimental *** this perspective,we highlight some common pitfalls when measuring and reporting electrocatalytic data,which should be avoided to ensure the accuracy and reproducibility and to advance the water splitting *** advocate to prevent the introduction of artefacts from the counter and reference electrodes,as well as the impurities in the electrolyte when conducting electrocatalyst activity *** addition,we encourage the use of the electrochemically active surface area(ECSA)-normalized current densities to represent the intrinsic activity of the reported catalysts for a better comparison with previously known *** ECSA measurement methods should be employed based on the nature of *** made in this perspective will hopefully assist in identifying advanced catalysts for water splitting research.

关键词： Electrocatalyst Water splitting Electrochemical active surface area Benchmarking catalyst Energy conversion and storage

Atlas of heating:Identifying regional climate-dependent heat demands in residential buildings of Iran

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Building Simulation 2021年第3期14卷 857-869页

作者： Pouria Orouji Ramin Hajian Mojgan Moradi Saeed Mohaghegh kamran Keynejad Mostafa Sefidgar Energy Department Asiawatt Engineering CompanyTehranIran Niroo Research Institute TehranIran Fouman Faculty of Engineering College of EngineeringUniversity of TehranGilanIran Pardis Islamic Azad University TehranIran

Due to different latitudes and variation of altitude in geographical areas in Iran,the climatic conditions of Iran are such that the variations of the heating degree-days(HDD)are in a broad range of 60 to 3000 for residential buildings in different climatic *** addition,in many cases,the building design and construction processes follow patterns which do not necessarily meet national energy requirements and *** on these two reasons,it is essential to identify the current status of energy consumption indicators in residential *** way,it gets more convenient to adopt new strategies to improve the current state of energy consumption of *** this study,heating energy consumption indices of residential buildings is *** the combination of the results of statistical data analysis,questionnaires,filled in for 500 buildings,and a reference building simulation in different climates of Iran,the heating atlas of residential buildings was *** to the results,the average heating energy index(HE1)of buildings in Iran can be less than 1 to more than 41.3(m^(3)(N.G)/(m^(2)-yr))depending on climatic conditions and building design and construction ***,in the coldest center of province,the average of this index is 26.3(m^(3)(N.G)/(m^(2)-yr))in the hottest one that is equal *** variations of the thermal base load(supply of hot water)varied from less than 13.12 to more than 378.84(m^(3)(N.G)/(person-yr)).In provincial capitals,the lowest thermal base load index(TBLI)of buildings is 24.78 and the highest is 226.49(m^(3)(N.G)/(person-yr)).In this paper,beside charts and tables,results of heating energy consumption indices are also presented in the form of graphical atlases,*** contour plots,to deliver a better picture of the whole country.

关键词： heating atlas reference building heating energy index thermal base load index residential building

Identification of novel catalytic features of endo-β-1,4-glucanase produced by mulberry longicorn beetle Apriona germari

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第10期8卷 765-770页

作者： SAMI Amtul Jamil HAIDER Mohammed kamran Institute of Biochemistry and Biotechnology University of the Punjab Lahore 54594 Pakistan

Mulberry longicorn beetle, Apriona germari, has been reported to produce two endo-β-1,4-glucanases or AgEGases (accession Nos. Q6SS52 and Q5XQD1). AgEGase sequence contains catalytic motif (amino acid residues 37~48), which is the characteristic of family Glycohydrolase 45 and is identified as the substrate binding site. The application of bioinformatics ap-proaches includes sequence analysis, structural modeling and inhibitor docking to relate the structure and function of AgEGases. We have dissected the sequence and structure of AgEGase catalytic motif and compared it with crystal structure of Humicola insolens endoglucanases V. The results show an involvement of sulfur containing amino acid residues in the active site of the enzyme. Cys residues and position of disulfide bonds are highly conserved between the two structures of endoglucanases of A. germari. Surface calculation of AgEGase structure in the absence of Cys residues reveals greater accessibility of the catalytic site to the substrate involving Asp42, a highly conserved residue. For the inhibition study, tannin-based structure was docked into the catalytic site of AgEGase using ArgusLab 4.0 and it resulted in a stable complex formation. It is suggested that the inhibition could occur through formation of a stable transition state analog-enzyme complex with the tannin-based inhibitor, as observed with other insect cellulases in our laboratory.

关键词： Cellulases AgEGase Apriona germari Inhibition Anthocyanidins

Oral manifestation in inflammatory bowel disease:A review

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World Journal of Gastroenterology 2013年第46期19卷 8571-8579页

作者： kamran B Lankarani Gholam Reza Sivandzadeh Shima Hassanpour Department of Internal Medicine Healthcare Policy Research Center Shiraz University of Medical Sciences Department of Internal Medicine Gastroenterohepatology Research Center Namazi Hospital Shiraz University of Medical Sciences Gastroenterohepatology Research Center Namazi Hospital Shiraz University of Medical Sciences

Inflammatory bowel diseases (IBDs), including Crohn’s disease (CD) and ulcerative colitis, not only affect the intestinal tract but also have an extraintestinal involvement within the oral cavity. These oral manifestations may assist in the diagnosis and the monitoring of disease activity, whilst ignoring them may lead to an inaccurate diagnosis and useless and expensive workups. Indurated tag-like lesions, cobblestoning, and mucogingivitis are the most common specific oral findings encountered in CD cases. Aphthous stomatitis and pyostomatitis vegetans are among non-specific oral manifestations of IBD. In differential diagnosis, side effects of drugs, infections, nutritional deficiencies, and other inflammatory conditions should also be considered. Treatment usually involves managing the underlying intestinal disease. In severe cases with local symptoms, topical and/or systemic steroids and immunosuppressive drugs might be used.

关键词： Inflammatory bowel disease, Crohn’ s disease, Ulcerative colitis, Extra-intestinal manifestations, Pyostomatitis vegetans, Aphthous stomatitis, Cobblestoning, Mucogingivitis, Oral manifestation

The effect of disc-shaped gastric resection of anastomosis site on reducing postoperative dysphagia and stricture after esophagogastric anastomosis in patients with esophageal cancer

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Gastroenterology Report 2017年第1期5卷 52-56,I0002页

作者： Rahim Mahmodlou kamran Shateri Faramarz Homayooni Sanaz Hatami Department of Surgery Urmia University of Medical SciencesUrmiaIran Department of Gastroenterology Urmia University of Medical SciencesUrmiaIran Students’Research Committee Urmia University of Medical SciencesUrmiaIran

Background:Esophagectomy remains the most reliable technique for managing esophageal cancer,but anastomotic complications including postoperative leak,ischemia and stricture negatively affect outcomes of this specific *** aim of this study was to evaluate the effects of a novel method of esophagogastric anastomosis for reducing postoperative dysphagia and stricture ***:Eighty patients who were scheduled for esophagectomy due to esophageal cancer were randomly assigned into two groups:intervention and control(40 each).In the control group,the esophagogastric anastomosis was performed with a linear gastric incision,whilst in the intervention group a new method of disc-shaped gastric resection for anastomosis was *** outcomes were compared between the two ***:The incidence of postoperative dysphagia and anastomotic stricture was significantly lower in the disc-shaped resection group(dysphagia 45%vs 75%,P=0.02;stricture 12.5%vs 32.5%,P=0.03),whilst the length of stay in an intensive care unit(ICU),anastomotic leakage and other complications were not significantly different between the two groups(all P>0.05).Conclusion:Anastomotic complications can be reduced by improving surgical *** decreased incidence of postoperative dysphagia and anastomotic stricture in our study may be partly due to providing the proper diameter for the site of anastomosis when using the disc-shaped gastric resection ***,this new method can improve the clinical outcomes of patients who undergo esophagectomy with esophagogastric anastomosis.

关键词： esophageal cancer esophagectomy esophagogastic anastomosis postoperative complications

Digital mapping of soil phosphorous sorption parameters (PSPs) using environmental variables and machine learning algorithms

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International Journal of Digital Earth 2023年第1期16卷 1752-1769页

作者： Sanaz Saidi Shamsollah Ayoubi Mehran Shirvani kamran Azizi Shuai Zhao Department of Soil Science College of AgricultureIsfahan University of TechnologyIsfahanIran Department Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences818 South Beijing RoadUrumqiPeople’s Republic of China

In this study some soil phosphorous sorption parameters(PSPs)by using different machine learning models(Cubist(Cu),random forest(RF),support vector machines(SVM)and Gaussian process regression(GPR))were *** results showed that using the topographic attributes as the sole auxiliary variables was not adequate for predicting the ***,remote sensing data and its combination with soil properties were reliably used to predict PSPs(R^(2)=0.41 for MBC by RF model,R^(2)=0.49 for PBC by Cu model,R^(2)=0.37 for SPR by Cu model,and R^(2)=0.38 for SBC by RF model).The lowest RMSE values were obtained for MBC by RF model,PBC by SVM model,SPR by Cubist model and SBC by RF *** results also showed that remote sensing data as the easily available datasets could reliably predict PSPs in the given study *** outcomes of variable importance analysis revealed that among the soil properties cation exchange capacity(CEC)and clay content,and among the remote sensing indices B5/B7,Midindex,Coloration index,Saturation index,and OSAVI were the most imperative factors for predicting *** studies are recommended to use other proximally sensed data to improve PSPs prediction to precise decision-making throughout the landscape.

关键词： Soil fertility random forest adsorption isotherms remote sensing variable importance analysis