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Numerical investigation into water entry problems of a flat plate with air pockets

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Journal of Ocean Engineering and Science 2023年第4期8卷 386-400页

作者： Casey O’Connor Saeed Mohajernasab nagi Abdussamie National Centre for Maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonTasmaniaAustralia

Computational Fluid Dynamics(CFD)investigations into water entry problems of a rigid flat plate with air pockets were systematically *** Volume of Fluid(VOF)model was utilised to capture localised slamming phenomena that occur during,and post-impact *** model’s geometry was modified to include a pocket on the slamming impact surface to investigate the effect of air entrapment on the magnitude and distribution of slamming forces and pressures.A parametric study was conducted on the geometric parameters of the modelled pocket by altering its area,depth,and volume to exam-ine the response of slamming force and pressure loading under several impact *** numerical results of slamming forces and pressures were in good agreement with experimental drop test measure-ments(with relative error of-6%and 7%for the magnitude of slamming force and pressure,respectively).The numerical results proved that the peak pressure is proportional to the magnitude of impact velocity squared(p maxαv^(2)).

关键词： Marine structures Slamming Air entrapment Computationalﬂuid dynamics Drop tests

Novel continuous single-step synthesis of nitrogen-modified TiO_2 by flame spray pyrolysis for photocatalytic degradation of phenol in visible light

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Journal of Materials Science & Technology 2018年第9期34卷 1494-1502页

作者： Thirupathi Boningari Siva nagi Reddy Inturi Makram Suidan Panagiotis g.Smirniotis Chemical Engineering Program College of Engineering & Applied Science University of Cincinnati Environmental Engineering College of Engineering & Applied Science University of Cincinnati

A novel rapid and continuous process has developed for the synthesis of nitrogen-doped TiO2（N-TiO2）with flame spray pyrolysis（FSP） method. The nitrogen incorporation into TiO2 was achieved by a facile modification（addition of dilute nitric acid） in the precursor for the synthesis. The catalysts were characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy, diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The doping of nitrogen into the TiO2 was confirmed by X-ray photoelectron spectroscopy（XPS） and energy dispersive X-ray（EDX） spectroscopy. The UV-vis spectra of the modified catalysts（with primary N source） exhibited band-gap narrowing for 4 N-TiO2 with band gap energy of 2.89 eV, which may be due to the presence of nitrogen in TiO2 structure. The introduction of secondary N-source（urea） into TiO2 crystal lattice results in additional reduction of the band gap energy to 2.68 eV and shows a significant improvement of visible light absorption. The N-TiO2 nanoparticles modified by using secondary N-source showed significant photocatalytic activity under visible light much higher than TiO2. The higher activity is attributed to the synergetic interaction of nitrogen with the TiO2 lattice. The lowering of the band-gap energy for the flame made N-doped TiO2 materials implies that the nitrogen doping in TiO2 by aerosol method is highly effective in extending the optical response of TiO2 in the visible region. The nitrogen atomic percentage has increased monotonically（0.09%-0.15%）with the increase in primary nitrogen source（nitric acid）, and significantly boosted to 0.97% when secondary nitrogen source（urea） was introduced. The highest rate of phenol degradation was obtained for catalysts with secondary N source due to increase in N content in the catalyst.

关键词： Flame spray pyrolysis(FSP) Titania (TiO2) Visible-light-induced Liquid phase Phenol photodegradation

generation of rogue waves at model scale

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Journal of Ocean Engineering and Science 2019年第2期4卷 100-112页

作者： Bailey groves nagi Abdussamie National Centre for Maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonTasmaniaAustralia

The study of rogue waves is becoming increasingly important,as the offshore oil and gas,as well as renewable energy industries,*** unpredictability of such disastrous waves poses a significant risk to floating and fixed structures,making it necessary to develop methods capable of recreating rogue waves for model testing *** this paper,an investigation into the useability of the NewWave theory,a theoretical formula for producing focused waves,was conducted in model test facilities with a *** numerical modelling of rogue waves was performed using MATLAB codes developed to create several types of wave *** success of the numerical generation of design rogue waves was dependent on the number of wave components used during construction such that a suitable rogue wave(H max/H s>2.0)could be created using 400 or more *** was found that the NewWave technique could construct and physically generate design rogue waves within a close range of the predicted height provided the main wavemaker stroke was smooth enough(at around 0.8 s trough-crest for the tested model scale).The measured rogue waves were found to be complex;highly non-linear in amplitude with the behaviour of up to the 3rd ***,it was observed that rogue waves,created based on a 100-year sea state,were very similar to the New Year Wave confirming that such extreme waves,approximately 25-27 m high at full scale,can indeed occur in severe sea states.

关键词： Rogue waves Numerical modelling Design rogue waves Model testing New Year Wave

The response of a semisubmersible model under focused wave groups: Experimental investigation

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Journal of Ocean Engineering and Science 2017年第3期2卷 161-171页

作者： Michael Banks nagi Abdussamie National Centre for Maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonTAS 7250Australia

In recent years,extreme wave events have occurred more frequently than have been predicted using theoretical *** is,therefore,a requirement to investigate the impact of these events on coastal and offshore *** paper reports on results of an experimental investigation into the interaction between unidirectional waves and a horizontally moored semisubmersible *** target crest height was created at a focal point and time using the focused wave *** values of wave steepness were tested in order to ascertain the nonlinear effects on the quality of waves generated by a piston-type *** measured crest height was in good agreement with the theoretical one within 4%relative *** magnitudes of heave and pitch motions of the model were found to increase as the wave steepness ***,the paper contributes towards establishing the application of focused wave technique to floating offshore platforms.

关键词： Focused wave Offshore platforms Dynamic response

Data Analytics for the Identification of Fake Reviews Using Supervised Learning

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Computers, Materials & Continua 2022年第2期70卷 3189-3204页

作者： Saleh nagi Alsubari Sachin N.Deshmukh Ahmed Abdullah Alqarni Nizar Alsharif Theyazn H.H.Aldhyani Fawaz Waselallah Alsaade Osamah I.Khalaf Department of Computer Science&Information Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabadIndia Department of Computer Sciences and Information Technology Albaha UniversitySaudi Arabia Department of Computer Engineering and Science Albaha UniversitySaudi Arabia Community College of Abqaiq King Faisal UniversityAl-AhsaSaudi Arabia College of Computer Science and Information Technology King Faisal UniversityAl-AhsaSaudi Arabia Al–Nahrain University BagdadIraq

Fake reviews,also known as deceptive opinions,are used to mislead people and have gained more importance *** is due to the rapid increase in online marketing transactions,such as selling and purchasing.E-commerce provides a facility for customers to post reviews and comment about the product or service when *** customers usually go through the posted reviews or comments on the website before making a purchase ***,the current challenge is how new individuals can distinguish truthful reviews from fake ones,which later deceives customers,inflicts losses,and tarnishes the reputation of *** present paper attempts to develop an intelligent system that can detect fake reviews on ecommerce platforms using n-grams of the review text and sentiment scores given by the *** proposed methodology adopted in this study used a standard fake hotel review dataset for experimenting and data preprocessing methods and a term frequency-Inverse document frequency(TF-IDF)approach for extracting features and their *** detection and classification,n-grams of review texts were inputted into the constructed models to be classified as fake or ***,the experiments were carried out using four different supervised machine-learning techniques and were trained and tested on a dataset collected from the Trip Advisor *** classification results of these experiments showed that na飗e Bayes(NB),support vector machine(SVM),adaptive boosting(AB),and random forest(RF)received 88%,93%,94%,and 95%,respectively,based on testing accuracy and tje *** obtained results were compared with existing works that used the same dataset,and the proposed methods outperformed the comparable methods in terms of accuracy.

关键词： E-commerce fake reviews detection methodologies machine learning hotel reviews

Risk assessment of LNg and FLNg vessels during manoeuvring in open sea

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Journal of Ocean Engineering and Science 2018年第1期3卷 56-66页

作者： nagi Abdussamie Mohamed Daboos Ismail Elferjani Chai Shuhong Abdusalam Alaktiwi National Centre for Maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonAustralia Marine and Offshore Engineering Faculty of EngineeringUniversity of TripoliPO Box 13275TripoliLibya RMIT University Melbourne VIC 3001Australia

Manoeuvring of a Liquefied Natural gas(LNg)carrier in open sea at Floating LNg(FLNg)terminals can be associated with several operational risks of potential consequences to human safety,the environment and *** this paper,a fuzzy set approach was developed to handle the uncertainty in expert opinions commonly used for qualitative risk assessment studies such as the risk *** parameters were modelled using a number of fuzzy sets,and a fuzzy risk value was calculated for several hazardous scenarios at different phases during ship berthing *** calculated fuzzy risk values were found to be consistent with the results of the risk matrix technique.©2017 Shanghai Jiaotong *** by Elsevier B.V.

关键词： Offshore gas export Floating gas terminals Hazards during ship manoeuvring Fuzzy logic

Concomitant-chemoradiotherapy-associated oral lesions in patients with oral squamous-cell carcinoma

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Cancer Biology & Medicine 2017年第2期14卷 176-182页

作者： Sadia Minhas Muhammad Kashif Wasif Altaf Nadeem Afzal Abdul Hanan nagi Oral Pathology Department Akhtar Saeed Medical and Dental College Immunology Department University of Health SciencesPunjab Dentistry Department Fauji Foundation Hospital Morbid Anatomy and Histopathology Department University of Health SciencesPunjab

Objective:Oral squamous-cell carcinoma(OSCC)accounts for >90% of oral cancers affecting adults mostly between the fourth to seventh decades of *** most common OSCC treatment is concomitant chemoradiotherapy(CCRT)having both locoregional and distant control,but CCRT has acute and chronic toxic effects on adjacent normal *** study aimed to determine the side effects of CCRT on the oral mucosa and to characterize the clinicopathology of oral lesions in patients with ***:This descriptive,cross-sectional study was certified by the Ethical Review Committee(UHS/Education/126-12/2728)of the University of Health Sciences,Lahore,*** patients(n=81)with various histological subtypes,grades,and stages were recruited,and findings on their oral examination were *** patients received 70,90,and 119 gy of radiotherapy dosages in combination with the chemotherapy drugs cisplatin and *** were analyzed using SPSS ***:The most common presentation of OSCC was a nonhealing ulcer(63%) involving tongue(55.6%).Clinical findings included mucositis(92.6%)and xerostomia of mild,moderate,and severe degrees in 11.1%,46.9%,and 35.8% cases,***(87.7%),palpable lymph nodes(64.2%),limited mouth opening(64.2%)and fistula(40.7%) were also *** females,the association of radiotherapy dosage with limited mouth opening,xerostomia,and histological grading was statistically significant(Pgs with xerostomia(P=0.003)was also statistically ***:CCRT induced mucositis,xerostomia,and trismus in patients with OSCC.

关键词：鳞状细胞癌化疗药物口腔癌治疗病变口腔粘膜临床表现组织学

Multi-component synthesis of methylene bis isoxazolo[4,5-b]-pyridine-N-oxides

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Chinese Chemical Letters 2010年第8期21卷 927-930页

作者： E.Rajanarendar M.nagi Reddy K.Rama Murthy Department of Chemistry Kakatiya University

A three component one-pot protocol was investigated for the synthesis of methylene bis isoxazolo[4,5-b]-pyridine-N-oxides from commercially available materials.

关键词： Multi-component synthesis Knoevenagel condensation Michael addition New methodology

Overview, prevention and management of chemotherapy extravasation

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World Journal of Clinical Oncology 2016年第1期7卷 87-97页

作者： Firas Y Kreidieh Hiba A Moukadem nagi S El Saghir Division of Hematology-Oncology Department of Internal Medicine American University of Beirut Medical Center Breast Center of Excellence NK Basile Cancer Institute American University of Beirut Medical Center

Chemotherapy extravasation remains an accidental complication of chemotherapy administration and may result in serious damage to patients. We review in this article the clinical aspects of chemotherapy extravasation and latest advances in definitions, classification, pre-vention, management and guidelines. We review the grading of extravasation and tissue damage according to various chemotherapeutic drugs and present an update on treatment and new antidotes including dexrazoxane for anthracyclines extravasation. We highlight the importance of education and training of the oncology team for prevention and prompt pharmacological and non-pharmacological management and stress the availability of new antidotes like dexrazoxane wherever anthracyclines are being infused.

关键词： Chemotherapy Extravasation Vesicant Tissue damage Dimethyl sulfoxide Dexrazoxane Antidote Hyaluronidase