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Coupled pile soil interaction analysis in undrained condition

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journal of Central South University 2013年第5期20卷 1376-1383页

作者： M.Y.fattah f.A.Salman Y.j.al-Shakarchi A.M.Raheem Building and Construction Engineering Department University of Technology Department of Civil Engineering Faculty of EngineeringUniversity of Malaya Department of Civil Engineering College of EngineeringUniversity of Baghdad Department of Civil Engineering College of EngineeringUniversity of Kirkuk

The effective stress method is developed to predict the axial capacity of piles in clay. The effective stress state changes due to the resulting pore pressure change and therefore, the strength and stiffness of the soil will change. In this work, the finite element method is utilized as a tool for the analysis of pile-soil systems in undrained condition. The computer program CRISP was developed to suit the problem requirements. CRISP uses the finite element technique and allows predictions to be made of ground deformation using critical state theories. Eight-node isoparametric element was added to the program in addition to the slip element. A pile loading problem was solved in which the pile-soil system is analyzed in undrained condition. The pile is modelled as elastic-plastic material, while the soil is assumed to follow the modified Cam clay model. During undrained loading condition, the settlement values increase by 22% when slip elements are used. The surface settlement increases by about three times when the load is doubled and the surface settlement at all points increases when using slip elements due to the mode of motion which allows smooth movement of the adjacent soil with respect to the pile. The vertical displacement increases as the distance decreases from the pile and negligible values are obtained beyond 10D (where D is the pile diameter) from the center of the pile and these values are slightly increased when slip elements are used. The vertical effective stress along a section at a distance D from the pile center is approximately the same for all load increments and lower values of effective vertical stress can be obtained when slip elements are used.

关键词： pile finite element coupled analysis undrained condition

Detailed Description of Mixed Symmetry States in ^94Mo Using Interacting Boson Model

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Communications in Theoretical Physics 2002年第6期37卷 699-705页

作者： f.H.al－Khudair LONggui－Lu DepartmentofPhysics TsinghuaUniversityBeijing100084China

We have investigated the low-lying collective states and electromagnetic transitions in 94Mo within the framework of the interacting boson model. The influence of model parameters on the energy levels and electromagnetic properties has been investigated. The analysis of the obtained results and the parameter values predict that the 23+state is the lowest mixed symmetry state with pure f = fmax - 1 in this nucleus. The calculated results predicate that the 25+ (two-Q-phonon) mixed symmetry state is closed to the j = 2+ at 2.870 MeV in the experimental data, and the 2.965 MeV state is the lowest mixed symmetry with j = 3+.

关键词：核物理 ^94Mo混合对称态相互作用玻色子模型

Impact of Zika virus non-structural protein mutations on hippocampal damage

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Neural Regeneration Research 2025年第8期20卷 2307-2308页

作者： Larissa M.g.Cassiano Roney S.Coimbra Neurogenômica/Imunopatologia Instituto RenéRachouFiocruzBelo HorizonteBrazil Departamento de Bioquímica e Imunologia Instituto de Ciências BiológicasUniversidade Federal de Minas GeraisBelo HorizonteBrazil

The Zika virus(ZIKV),a member of the flaviviridae family,attracted worldwide attention for its connection to severe neurological effects,notably microcephaly in newborns,first reported during the 2015 epidemic in ***,its impact goes beyond fetal and neonatal abnormalities,also affecting the central nervous system(CNS)in both children and adults,leading to enduring cognitive and behavioral impairments.

关键词： damage fetal neonatal

Modeling and Optimization of Surface Roughness of Epoxy/Nanoparticles Composite Coating

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Computers, Materials & Continua 2022年第4期71卷 71-83页

作者： A.f.Mohamed j.Abu alsoud Mujahed al-Dhaifallah Hegazy Rezk Mohamed K.Hassan Department of Mechanical Engineering College of Engineering&Islamic Arch.Umm Alqura UniversityMakkahSaudi Arabia Department of Mechanical Engineering Faculty of EngineeringSohag UniversitySohagEgypt Department of Systems Engineering King Fahd University of Petroleum&MineralsDhahran31261KSA College of Engineering at Wadi Addawaser Prince Sattam Bin Abdulaziz UniversityAl-Kharj11911Saudi Arabia Department of Electrical Engineering Faculty of EngineeringMinia UniversityMinia61517Egypt Department of Production Engineering and Design Faculty of EngineeringMinia UniversityMinia61517Egypt

In power plants,flue gases can cause severe corrosion damage in metallic parts such as flue ducts,heat exchangers,and *** is an effective technique to prevent this damage.A robust fuzzy model of the surface roughness(Ra and Rz)of flue gas ducts coated by protective composite coating from epoxy and nanoparticles was constructed based on the experimental *** proposed model consists of four nanoparticles(ZnO,ZrO2,SiO2,and NiO)with 2%,4%,6%,and 8%,*** surface methodology(RSM)was used to optimize the process parameters and identify the optimal conditions for minimum surface roughness of this coated *** prove the superiority of the proposed fuzzy model,the model results were compared with those obtained by ANOVA,with the coefficient of determination and the root-mean-square error(RMSE)used as *** Ra,for the first output response,using ANOVA,the coefficient-of-determination values were 0.9137 and 0.4037,respectively,for training and ***,for Rz,the second output response,the coefficient-of-determination results were 0.9695 and 0.4037,respectively,for training and *** the fuzzy modeling of Ra,for the first output response,the RMSE values were 0.0 and 0.1455,respectively,for training and *** values for the coefficient of determination were 1.00 and 0.9807,respectively,for training and *** results prove the superiority of fuzzy *** modeling the second output response Rz,the RMSE values were 0.0 and 0.0421,respectively,for training and testing,and the coefficient-of-determination values were 1.00 and 0.9959,respectively,for training and testing.

关键词： Materials coating nanoparticles modeling and optimization

Effects of a low-radiotoxicity uranium salt(uranyl acetate) on biochemical and hematological parameters of the catfish,Clarias gariepinus

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Chinese journal of Oceanology and Limnology 2016年第1期34卷 109-117页

作者： Khalid.A.al-gHANIM Zubair AHMAD Hmoud f.al-Kahem al-BalAWI fahad al-MISNED Shahid MABOOB El-Amin M.SULIMAN Department of Zoology College of ScienceP.O.Box 2455King Saud University

Specimens of Clarias gariepinus were treated with lethal(70,75,80,85,90,and 95 mg/L) and sub-lethal concentrations(8,12 and 16 mg/L) of uranyl acetate,a low-radiotoxicity uranium salt. The LC 50 value was registered as 81.45 mg/L. The protein and glycogen concentrations in liver and muscles were decreased in the fish exposed to sub-lethal concentrations. The red blood cell(RBC) and white blood cell(WBC) counts,haemoglobin(Hb) concentration and haematocrit(Hct) values were decreased. Different blood indices like mean corpuscular volume(MCV),mean corpuscular haemoglobin(MCH) and mean corpuscular haemoglobin concentration(MCHC) were negatively affected. Level of plasma glucose was elevated whereas protein was decreased. The level of calcium concentration(Ca) was declined in the blood of exposed fish whereas magnesium(Mg) remains unchanged. The activity level of glutamic-oxaloacetic transaminase(gOT) and glutamic-pyruvic transaminase(gPT) was elevated in exposed fish. These effects were more pronounced in the last period of exposure and in higher concentrations. Results of the present study indicate that uranyl acetate has adverse effects on C larias gariepinus and causes changes in the biochemical and hematological parameters of the fish.

关键词： Clarias gariepinus uranyl acetate sub-lethal concentration biochemical and haematological parameters

Mineral dust resuspension under vibration: Onset conditions and the role of humidity

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Particuology 2020年第3期18卷 112-119页

作者： f.j.Balladore j.g.Benito R.O.Unac A.M.Vidales Departamento de Mineria Facultad de Ciencias Fisico Matematicas y NaturalesUniversidad Nacional de San LuisChacabuco 917D5700HHWSan LuisArgentina INfAP CONICETDepartamento de FisicaFacultad de Ciencias Fisico Matematicas y NaturalesUniversidad Nacional de San LuisEjercito de los Andes 950D5700HHWSan LuisArgentina

The vibration of dusty surfaces inevitably causes re-entrainment of particles into the *** that movement of mineral dust particles deposited on a surface begins at a critical frequency (fc) and amplitude,an experimental laboratory study was conducted to determine the onset conditions for resuspension of a vibrated granular *** determined the resuspension state diagram as a function of frequency and amplitude of a sinusoidal vibration,the granulometry of the dust and the thickness of the soil *** mitigation effect of humidity was also *** frequencies ranged between 2.5 and 23 Hz when amplitudes were less than 12 *** results were independent of bed thickness and perturbation *** all particle sizes observed,fc decreased monotonically with A,contrasting with behavior observed for individual *** dry samples,fe for large size classes was markedly less when A was greater than 6 mm;while thefc for fine fractions only decreased once amplitudes reached 10 *** with wet granular soils demonstrated that wetting above an optimum humidity did not necessarily impede movement and caused *** study provides guidelines for managing resuspension of granular soils subjected to vibrations.

关键词： Resuspension Vibration granular soil Mineral dust Critical frequency Humidity

Temporal dynamics of neonatal hypoxic-ischemic encephalopathy injuries on magnetic resonance imaging

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Neural Regeneration Research 2025年第11期20卷 3144-3150页

作者： Holly flyger Samantha j.Holdsworth alistair j.gunn Laura Bennet Hamid Abbasi Mātai Medical Research Institute Tairāwhiti GisborneNew Zealand Department of Anatomy&Medical Imaging Faculty of Medical and Health SciencesThe University of AucklandAucklandNew Zealand Center for Brain Research The University of AucklandAucklandNew Zealand Auckland Bioengineering Institute The University of AucklandAucklandNew Zealand

Moderate to severe perinatal hypoxic-ischemic encephalopathy occurs in~1 to 3/1000 live births in high-income countries and is associated with a significant risk of death or neurodevelopmental *** assessment is important to help identify highrisk infants,to help families,and to support appropriate interventions.A wide range of monitoring tools is available to assess changes over time,including urine and blood biomarkers,neurological examination,and *** present,magnetic resonance imaging is unique as although it is expensive and not suited to monitoring the early evolution of hypoxic-ischemic encephalopathy by a week of life it can provide direct insight into the anatomical changes in the brain after hypoxic-ischemic encephalopathy and so offers strong prognostic information on the long-term outcome after hypoxic-ischemic *** review investigated the temporal dynamics of neonatal hypoxic-ischemic encephalopathy injuries,with a particular emphasis on exploring the correlation between the prognostic implications of magnetic resonance imaging scans in the first week of life and their relationship to long-term outcome prediction,particularly for infants treated with therapeutic hypothermia.A comprehensive literature search,from 2016 to 2024,identified 20 pertinent *** review highlights that while the optimal timing of magnetic resonance imaging scans is not clear,overall,it suggests that magnetic resonance imaging within the first week of life provides strong prognostic *** challenges limit the timing consistency,particularly the need for intensive care and clinical ***,although most reports examined the prognostic value of scans taken between 4 and 10 days after birth,there is evidence from small numbers of cases that,at times,brain injury may continue to evolve for weeks after *** suggests that in the future it will be important to explore a wider range of times after hypo

关键词： magnetic resonance imaging neonatal hypoxic-ischemic encephalopathy neurodevelopmental outcomes prognostic biomarkers in neuroimaging scan timing therapeutic hypothermia

HIgH-TEMPERATURE LOW-CYCLE fATIgUE BEHAVIOR Of NICKEL-BASED SUPERalLOY gH4049

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Acta Metallurgica Sinica(English Letters) 1999年第1期12卷 12-15页

作者： Chen, L.j. Yao, g. Wang, Z.g. Tian, j.f. Inst of Metal Research The Chinese Acad of Sciences Shenyang China

The cyclic stress response and lowcycle fatigue life for wrought nickelbased superalloy gH4049 were investigated in the temperature range from 500 to 800 The relationship between the strain amplitude and the number of stress reversals was given. The behavior of cyclic hardening was observed for higher strain amplitudes at all testing temperatures and the lowcycle fatigue life generally decreased with increasing testing temperature for the same strain range. In addition, fracture surfaces of the fatigued samples were examined by using a scanning electron microscope.

关键词： superalloy low cycle fatigue fatigue life

jACOBI POLYNOMIalS USED TO INVERT THE LAPLACE TRANSfORM

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Analysis in Theory and Applications 2004年第1期20卷 28-34页

作者： A.al-Shuaibi f.al-Rawjih King fahd University of Petroleum and Minerals Dhahran Saudi ArabiaCollege For Girls Dammam Saudi Arabia

given the Laplace transform f(s) of a function f(t), we develop a new algorithm to find on approximation to f(t) by the use of the dassical jacobi polynomials. The main contribution of our work is the development of a new and very effective method to determine the coefficients in the finite series ex-pansion that approximation f(t) in terms of jacobi polynomials. Some numerical examples are illustrated.

关键词： Inverse Laplace transform jacobi polynomials Integral transforms Ill-posed problems