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Experimental studies and artificial neural network modeling of surface tension of aqueous sodium L-prolinate solutions and piperazine blends

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Chinese Journal of Chemical Engineering 2019年第8期27卷 1904-1911页

作者： muham.a. Shuaib shaikh A.m.Shariff m.a.Bustam Sahil Garg Khadija Qureshi Pervez Hameed shaikh Inamullah Bhatti Department of Chemical Engineering Mehran University of Engineering&Technology JamshoroSindh 76062Pakistan CO2 Research Centre(CO2RES) Universiti Teknologi PETRONASBandar Seri Iskandar 32610PerakMalaysia School of Chemical Engineering The University of QueenslandSt Lucia 4072Australia Office of Research Innovation and Commercialization(ORIC) Mehran University of Engineering&Technology JamshoroSindh 76062Pakistan

The surface tension study is very crucial for the design of CO2 gas absorption contacting equipment. The significance of the surface tension has been increasing due to its consideration in various technological fields. This property influences the mass transfer and hydrodynamics of gas absorption systems, mainly multiphase systems, in which the interface between gas and liquid exists. Therefore, in this study, surface tension of aqueous solutions of sodium L-prolinate(SP) and piperazine(PZ) blends were m.a.ured at ten different temperatures from(298.15 to 343.15) K. The SP mass fractions were 0.10, 0.20, and 0.30;while the mass fractions of PZ were 0.02 and 0.05. The experimental results showed that the surface tension increase with increasing the mass fractions of SP and PZ in aqueous blends, and decrease linearly with rising temperature. The experimental data of surface tension were correlated by two empirical correlations as a function of temperature and mass fractions for estimating the predicted data using the optimized correlation coefficients. moreover, the modeling of surface tension data was carried out using Artificial Neural Network(ANN) approach. The results obtianed from.a.N modeling were com.a.ed with applied empirical correlation. It was found that the ANN approach outperformed the empirical correlation used in this study. Besides, a quantitative analysis of variation(ANOVA) was performed in order to determine the significance of data. The surface tension of aqueous SP and SP + PZ was also com.a.ed with various conventional solvents.

关键词： Surface tension L-Prolinate Piperazine Correlation Prediction Neural network

Precipitation Study in Inconel 625 Alloy by Positron Annihilation Spectroscopy

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Journal of materials Science & Technology 2003年第5期19卷 434-436页

作者： m.a.mad. W.Ahmad. m.a.shaikh mahmud Ahmad m.U.Rajput Nuclear Physics Division Pakistan Institute of Nuclear Science & Technology P.O. Nilore Islamabad PakistanNuclear Physics Division Pakistan Institute of Nuclear Science & Technology P.O. Nilore Islamabad PakistanNuclear Physics Division Pakistan Institute of Nuclear Science & Technology P.O. Nilore Islamabad PakistanNuclear Physics Division Pakistan Institute of Nuclear Science & Technology P.O. Nilore Islamabad Pakistan Nuclear Physics Division Pakistan Institute of Nuclear Science & Technology P.O. Nilore Islamabad Pakistan

Precipitation in Inconel 625 alloy has been studied by positron annihilation spectroscopy and electron microscopy. The observed dependence of annihilation characteristics on aging time is attributed to the change of the positron state due to the increase and decrease of the density and size of the 7' precipitates. Hardness m.a.urements and lifetime m.a.urements are in good agreement.

关键词： Positron lifetime Precipitation Inconel 625 alloy Fast-fast coincidence system Hardness

Wavelet Decomposition Im.a.ts on Traditional Forecasting Time Series models

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Computer modeling in Engineering & Sciences 2022年第3期130卷 1517-1532页

作者： W.A.shaikh S.F.Shah S.m.Pandhiani m.a.Solangi Department of mathematics and Statistics Quaid-e-Awam University of EngineeringScience&TechnologyNawabshahSindhPakistan Department of Basic Sciences&Related Studies Mehran University of Engineering&TechnologyJamshoroSindhPakistan Department of General Studies Jubail University CollegeAl JubailSaudi Arabia

This investigative study is focused on the im.a.t of wavelet on traditional forecasting time-series models,which significantly shows the usage of wavelet *** Decomposition(WD)algorithm has been combined with various traditional forecasting time-series models,such as Least Square Support Vector machine(LSSVm),Artificial Neural Network(ANN)and multivariate Adaptive Regression Splines(mARS)and their effects are examined in terms of the statistical *** WD has been used as a mathematical application in traditional forecast modelling to collect periodically m.a.ured parameters,which has yielded tremendous constructive ***,it is observed that the wavelet combined models are classy com.a.ed to the various time series models in terms of performance ***,combining wavelet forecasting models has yielded much better results.

关键词： Im.a.t wavelet decomposition combined traditional forecasting models statistical analysis

Therapeutic management options for stage Ⅲ non-small cell lung cancer

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World Journal of Clinical Oncology 2017年第1期8卷 1-20页

作者： Stephanie m Yoon Talha shaikh mark Hallman Department of Radiation Oncology Fox Chase Cancer Center

Lung cancer is the leading cause of cancer death *** of newly diagnosed lung cancers are non-small cell lung cancer(NSCLC), of which up to half are considered locally advanced at the time of *** with locally advanced stage Ⅲ NSCLC consists of a heterogeneous population, making management for these patients *** has long been the preferred local treatment for patients with resectable *** select patients, multimodality therapy involving systemic and radiation therapies in addition to surgery improves treatment outcomes com.a.ed to surgery *** patients with unresectable disease, concurrent chemoradiation is the preferred *** recently, research into different chemotherapy agents, targeted therapies, radiation fractionation schedules, intensity-modulated radiotherapy, and proton therapy have shown promise to improve treatment outcomes and quality of *** array of treatment approaches for locally advanced NSCLC is large and constantly *** updated review of past and current literature for the roles of surgery, chemotherapeutic agents, radiation therapy, and targeted therapy for stage Ⅲ NSCLC patients are presented.

关键词： Non-small cell lung cancer Chemoradiotherapy multi-modality Targeted therapy Doseescalation

Im.a.t of long term uplift on stream networks in tectonically active Northern Hill Range, Kachchh palaeo-rift basin, western India

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Journal of mountain Science 2021年第6期18卷 1609-1629页

作者： Akash PADmALAL Deepak m mAURYA Naimisha P VANIK mohamedharoon A shaikh Prabhuti TIWARI Laxman S CHAm.a. Department of Geology The Maharaja Sayajirao University of BarodaVadodara 390002GujaratIndia

The study deals with stream response to sustained tectonic during the Cenozoic and development of two parallel scarps in the western Kachchh. The study encom.a.ses fluvial networks developed over the Jara and Jumara domes, which are a part of the laterally extensive belt of flexures bounded by the Kachchh mainland Fault(KmF) to their north and called as Northern Hill Range(NHR). Parameters such as longitudinal profile, Hack profile, stream length gradient index(SL), hypsometric curve, hypsometric integral(HI), valley floor width to height ratio(Vf), elongation ratio(Re) and escarpment sinuosity(ES) were analysed. Hack profiles of the major rivers draining through the area show similar convex up nature suggesting primary influence of the tectonics in controlling and shaping the landscape of the region. Elongation ratio metric integral suggest the tendency of river systems to increase the basin area longitudinally rather than laterally. The study suggests that higher net uplift in the eastern half(Jumara dome) caused the rivers to overcome the structural control and to carve out generally straight north oriented channels. The rivers of western part(Jara dome) show more prominent structural control of cuesta girdles formed in com.a.t lithologies and attributed to the domal structure. The ~10 km long Jaramara scarp believed to the rem.a.t of older KmF scarp, is a product of headward erosion of the fluvial channels through different hard and soft litho-units of the area. The similar orientation of Jaramara scarp and morphology of the Ukra intrusive body suggests that the Ukra intrusive played a significant role in controlling the formation and morphology of the Jaramara scarp.

关键词： Fluvial geomorphology Landscape evolution Kachchh paleo-rift basin Kachchh mainland Fault Tectonic uplift Scarp evolution

Scale-up effect analysis and modeling of liquid-solid circulating fluidized bed risers using multigene genetic programming

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Particuology 2020年第5期18卷 57-66页

作者： shaikh A.Razzak Saddam.a.AI-Ham.a.i Syed m.Rahman moham.a. R.Quddus moham.a. m.Hossain Jesse Zhu Department of Chemical Engineering King Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia Center for Environment&Water RIKing Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia Department of Chemical and Biochemical Engineering University of Western OntarioCanada

Understanding scale-up effects on the hydrodynamics of a liquid-solid circulating fluidized bed(LSCFB)unit requires both experimental and theoretical *** implement multigene genetic programming(mGGP)to investigate the solid holdup and distribution in three LSCFB systems with different *** addition to data obtained here,we also use a portion of data sets of LSCFB systems developed by Zheng(1999)and Liang et al.(1996).model predictions are in good agreement with the experimental data in both radial and axial directions and at different normalized superficial liquid and solid *** radial profiles of the solid holdup are approximately identical at a fixed average cross-sectional solid holdup for the three LSCFB systems *** performance indicators including the m.a. absolute percentage error(6.19%)and correlation coefficient(0.985)are within an acceptable *** results suggest that a mGGP modeling approach is suitable for predicting the solid holdup and distribution of a scaled-up LSCFB system.

关键词： Fluidization Liquid-solid circulating fluidized bed multigene genetic programming Scale-up effect Normalized superficial liquid velocity Solid holdup

Path planning for moving target tracking by fixed-wing UAV

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Defence Technology（防务技术） 2020年第4期16卷 811-824页

作者： Song-lin Liao Rong-ming Zhu Nai-qi Wu Tauqeer Ahmed shaikh mohamed Sharaf Almetwally m.mostafa School of Electro-mechanical Engineering Xidian UniversityXi'an 710071China Institute of Systems Engineering Macao University of Science and TechnologyTaipa999078Macao Electrical Engineering Department College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia Industrial Engineering Department College of EngineeringKing Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia College of Computer and Information Sciences King Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia Faculty of Engineering Alazhar University CairoEgypt

For the automatic tracking of unknown moving targets on the ground,most of the commonly used methods involve circling above the *** such a tracking mode,there is a moving laser spot on the target,which will bring trouble for cooperative manned *** this paper,we propose a new way of tracking,where an unmanned aerial vehicle(UAV) circles on one side of the tracked target.A circular path algorithm is developed for monitoring the relative position between the UAV and the target considering the real-time range and the bearing *** can determine the center of the new circular path if the predicted range between the UAV and the target does not meet the monitoring requirements.A transition path algorithm is presented for planning the transition path between circular paths that constrain the turning radius of the *** transition path algorithm can generate waypoints that meet the flight *** this paper,we analyze the entire method and detail the scope of *** formulate an observation angle as an evaluation index.A series of simulations and evaluation index com.a.isons verify the effectiveness of the proposed algorithms.

关键词： Bearing angle Fixed-wing UAV Laser designation moving target tracking Path planning

Synthesis, characterization and electrochemical evaluation of anticorrosion property of a tetrapolymer for carbon steel in strong acid media

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Chinese Journal of Chemical Engineering 2019年第4期27卷 965-978页

作者： Shamsuddeen A.Haladu Saviour A.Umoren shaikh A.Ali moses m.Solomon Abdul-Rashid I.mohammed Department Basic Sciences and Humanities College of Engineering Imam Abdulrahman Bin Faisal University Dammam 31451 Saudi Arabia Centre of Research Excellence in Corrosion Research Institute King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia Department of Chemistry King Fahd University of Petroleum & Minerals Dhahran 31261 Saudi Arabia Centre for Engineering Research Research Institute King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia

A novel tetrapolymer(TP) consisting of carboxylate, sulphonate, phosphonate and sulfur dioxide based comonomers was synthesized using Butler cyclopoymerization technique. The synthesized tetrapolymer was characterized using FTIR,1H-NmR,13CNmR and elemental analysis. The performance of the tetrapolymer as a corrosion inhibitor for St37 carbon steel in 15% HCl and 15% H2SO4 acid media was assessed using electrochemical impedance spectroscopy(EIS), linear polarization resistance(LPR), potentiodynamic polarization(PDP) and electrochemical frequency modulation(EFm) techniques. The influence of addition of a small amount of KI on the corrosion inhibition efficiency of TP was also assessed. Results obtained showed that the tetrapolymer moderately inhibited the corrosion of St37 steel in the acid media with protection efficiency of 79.5% and 61.1% at the optimum concentration of 1000 mg·L^-1 studied in HCl and H2SO4 media respectively. On addition of 5 mmol·L^-1 KI to the optimum tetrapolymer concentration, the protection efficiency was upgraded to 90.6% and 93.5% in HCl and H2SO4 environment, respectively. The enhanced performance of the polymer in the presence of KI is due to synergistic action deduced from synergism parameter(S1) which was found to be greater than *** tetrapolymer afforded the corrosion inhibition of St37 steel in the acid media by virtue of adsorption of the polymer molecules on the steel surface which was confirmed by ATR-FTIR analysis of the adsorbed film extracted from the steel surface. TP + KI formed complex with St37 steel surface in H2SO4 solution but not in HCl solution.

关键词： Tetrapolymer metal Acid corrosion Corrosion inhibition Adsorption Synergism

Reduced tillage with residue retention improves soil labile carbon pools and carbon lability and management indices in a seven-year trial with wheat-mung bean-rice rotation

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Pedosphere 2022年第6期32卷 916-927页

作者： Rafeza BEGUm moham.a. m.R.JAHANGIR moham.a. JAHIRUDDIN moham.a. Rafiqul ISLAm shaikh m.BOKHTIAR Khandakar R.ISLAm Department of Soil Science Bangladesh Agricultural UniversityMymensingh 2202(Bangladesh) Soil Resource Development Institute Dhaka 1215(Bangladesh) South Asian Association for Regional Cooperation(SAARC)Agriculture Center Dhaka 1215(Bangladesh) The Ohio State University Columbus OH 43235(USA)

Soil total organic carbon(TOC)is a composite indicator of soil quality with implications for crop production and the regulation of soil ecosystem *** reports on the dynamics of TOC as a consequence of soil management practices in subtropical climatic conditions,where microbial carbon(C)loss is high,are very *** objective of our study was to evaluate the im.a.t of seven years of continuous tillage and residue management on soil TOC dynamics(quantitative and qualitative)with respect to lability and stratification under an annual wheat-mung bean-rice cropping *** soil samples were collected at 0-15 and 15-30 cm depths from.a.three-replicate split-plot experiment with tillage treatment as the main plots and crop residue levels as the *** tillage treatments included conventional tillage(CT)and strip tillage(ST).Residue levels were high residue level(HR),30%of the plant height,and low residue level(LR),15%.In addition to TOC,soil samples were analyzed for particulate organic C(POC),permanganate oxidizable C(POXC),basal respiration(BR),specific maintenance respiration rate(qCO_(2)),microbial biomass C(mBC),potentially mineralizable C(PmC),and TOC lability and management *** ST treatment significantly increased the TOC and labile C pools at both depths com.a.ed with the CT treatment,with the effect being more pronounced in the surface *** HR treatment increased TOC and labile C pools com.a.ed with the LR *** ST+HR treatment showed significant increases in mBC,metabolic quotient(qR),C pool index(CPI),C lability index(CL_(I)),and C management index(CmI),indicating improved and efficient soil biological activities in such systems com.a.ed with the CT ***,the stratification values,a m.a.ure of soil quality improvement,for POC and mBC were>2,indicating improved soil quality in the ST+HR treatment com.a.ed with the CT *** ST+HR treatment not only significantly increased the contents o

关键词： basal respiration carbon management index carbon stratification particulate organic carbon permanganate oxidizable carbon total organic carbon