|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Influence of vertical loads on lateral response of pile foundations in sands and clays显示文摘Although the load applied to pile foundations is usually a combination of vertical and lateral components,there have been few investigations on the behavior of piles subjected to combined loadings.Those few studies led to inconsistent results with regard to the effects of vertical loads on the lateral response of piles.A series of three-dimensional(3D) finite differences analyses is conducted to evaluate the influence of vertical loads on the lateral performance of pile foundations.Three idealized sandy and clayey soil profiles are considered:a homogeneous soil layer,a layer with modulus proportional to depth,and two-layered strata.The pile material is modeled as linearly elastic,while the soil is idealized using the Mohr-Coulomb constitutive model with a non-associated flow rule.In order to confirm the findings of this study,soils in some cases are further modeled using more sophisticated models(i.e.CYsoil model for sandy soils and modified Cam-Clay(MCC) model for clayey soils).Numerical results showed that the lateral resistance of the piles does not appear to vary considerably with the vertical load in sandy soil especially at the loosest state.However,the presence of a vertical load on a pile embedded in homogeneous or inhomogeneous clay is detrimental to its lateral capacity,and it is unconservative to design piles in clays assuming that there is no interaction between vertical and lateral loads.Moreover,the current results indicate that the effect of vertical loads on the lateral response of piles embedded in twolayered strata depends on the characteristics of soil not only surrounding the piles but also located beneath their tips. | Lassaad Hazzar Mahmoud N.Hussien Mourad Karray | 2017 | Journal of Rock Mechanics and Geotechnical Engineering2017，9，2： | 7 |
| 2 | Acute effects of chlorpyryphos-ethyl and secondary treated effluents on acetylcholinesterase and butyrylcholinesterase activities in Carcinus maenas显示文摘The acute effects of commercial formulation of chlorpyrifos-ethyl (Dursban ) and the secondary treated industrial/urban effluent (STIUE) exposure on acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) activities in hepatopancreas and gills of Mediterranean crab Carcinus maenas were investigated. After 2 d of exposure to chlorpyriphos-ethyl, the AChE activity was inhibited in both organs at concentrations of 3.12 and 7.82 μg/L, whereas the BuChE was inhibited only at higher concentration 7.82 μg/L of commercial preparation Dursban . The exposure of crabs to Dursban (3.12 μg/L) showed a significant decrement of AChE activity at 24 and 48 h, whereas the BuChE was inhibited only after 24 h and no inhibition for both enzymes was observed after 72 h. Moreover, a significant repression of AChE activity was observed in both organs of C. maenas exposed to 5% of STIUE. Our experiments indicated that the measurement of AChE activity in gills and hepatopancreas of C. maenas would be useful biomarker of organophosphorous (OP) and of neurotoxic effects of STIUE in Tunisia. | Jihene Ghedira Jamel Jebali Zied Bouraoui Mohamed Banni Lassaad Chouba Hamadi Boussetta | 2009 | Journal of Environmental Sciences2009，21，10： | 4 |
| 3 | Nonlinear dy- namics of a two - stage gear system with mesh stiffness fluctuation, bearing flexibility and backlash显示文摘 | Lassaad Walha Tahar Fakhfakh Mohamed Haddar | 2009 | Mechanism and Machine The- ory2009，44，5： | 1 |
| 4 | A local accumulation of the Ralstonia solanncearum PopA protein in transgenic tobacco renders a compatible plant- pathogen interaction incompatible显示文摘 | Lassaad Belbahri Christian Boucher Thierry Candresse | 2001 | The Plant Journal2001，28，4： | 1 |
| 5 | Nested metamaterials antenna for RFID traceability显示文摘 | Seif Naoui Lassaad Latrach Ali Gharsallah | 2014 | Microw Opt Technol Lett2014，，7： | 1 |
| 6 | Effects of gear mesh fluctuation and defaults on the dynamic behavior of two-stage straight bevel system显示文摘 | Yassine D Ahmed H Lassaad W | 2014 | Mechanism and Machine Theory2014，82，12： | 1 |
| 7 | Bubble hydrodynamic influence on oxygen transfer rate at presence of cationic and anionic surfactants in electroflotation process显示文摘In this work,the effects of the presence of surfactants in the liquid phase and the hydrodynamic regime of the bubble flow on the oxygen transfer rate were investigated in an electroflotation process in batch mode.The volumetric mass transfer coefficient L K a and the oxygenation capacity were evaluated to improve the performances of the electroflotation process in terms of oxygenation.In order to evaluate the liquid-side mass transfer coefficient L K,the volumetric mass transfer coefficient L K a was dissociated into L K and the specific interfacial area(a)since the last one was obtained from the gas hold-up and the bubble diameter.The effect of Reynolds number which define the hydrodynamic of the bubble flow has been also studied.Models of L K a and L K have been established to show the effects of the hydrodynamic parameters and liquid phase characteristics on the oxygen transfer rate. | KOTTI Mariam KSENTINI Issam BEN MANSOUR Lassaad | 2013 | Journal of Hydrodynamics2013，25，5： | 1 |
| 8 | Dynamic behavior of a two-stage gear train used in a fixed-speed wind turbine显示文摘 | Abboudi Kamel Lassaad Walha Driss Yassine | 2011 | Mechanism and Machine Theory2011，46，12： | 1 |
| 9 | Effects of gear mesh fluctuation and defaults on the dynamic behavior of two-stage straight bevel system显示文摘 | YASSINE D AHMED H LASSAAD W | 2014 | Mechanism and Machine Theory2014，82，24： | 1 |
| 10 | Dynamic behavior of a two-stage gear train used in a fixed-speed wind turbine 显示文摘 | ABBOUDI Kamel WALHA Lassaad DRISS Yassine | 2011 | Mechanism and Machine Theory2011，，46： | 1 |
| 11 | Quality management practices and their impact on performance显示文摘 | Lassaad Lakhal Federico Pasin Mohamed Limam | 2006 | International Journal of Quality & Reliability Management2006，23，6： | 1 |
| 12 | Effect of chemical modification of luffa cylindrical fibers on the mechanical and hygrothermal behaviours of polyester/luf fa composites显示文摘 | Lassaad Ghali Mourad Aloui Mondher Zidi etal | 2011 | Bioresources2011，6，4： | 1 |
| 13 | Use of chloride mass balance and tritium data for es- timation of groundwater recharge and t~newal rata in an uncon显示文摘 | Lassaad Dassi | 2010 | Environ Earth2010，60，： | 1 |
| 14 | Measur- ing irrigation water use efficiency using stochastic production frontier:An application on citrus producing farms in Tunisia 显示文摘 | BOUBAKER D LASSAAD L MOHAMED E | 2007 | Afriean Journal of Agricultural and Resource Economics African Association of Agricultural Economists2007，1，2： | 1 |
| 15 | Personal networks and knowl- edge transfer in inter - organizational networks 显示文摘 | Nada R K Lassaad M | 2011 | Journal of Small Business and Enterprise Development2011，18，2： | 1 |
| 16 | Removal of chromate anions by micellar-enhanced uhrafiltration using eationie surfactants 显示文摘 | Lassaad Gzara Mahmoud Dhahbi | 2001 | Desalination2001，137，： | 1 |
| 17 | Removal of chro-mate anions by micellar-enhanced ultrafiltration usingcationic surfactants 显示文摘 | Lassaad Gzara Mahmoud Dhahbi | 2001 | Desalination2001，137，： | 1 |
| 18 | Far-infrared (λ~=87μm) bound-to-continuum quantum-cascade lasers operating up to 90 K显示文摘 | Scalari Giacomo Ajili Lassaad Faist Jér?me | | 0，，19： | 1 |
| 19 | Innovative hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride(PVDF)composite membrane for vacuum membrane distillation显示文摘Though membrane distillation(MD)has gained more and more attention in the field of desalination,the wetting phenomenon was still a non-negligible problem.In this work,a method combined dip-coating and UV in situ polymerization for preparing hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride composite membranes.This composite membrane consisted of a top thin hydrophobic coating layer and hydrophilic substrate membrane.In terms of anti-wetting properties,contact angle and liquid entry pressure of all composite membranes(except for those based on 0.45μm)exceeded 160°and 0.3 MPa,respectively.In particular,the desalination performance was tested in vacuum membrane distillation tests by feeding 3.5%(mass)saline solution(NaCl)at 60℃.The composite membranes with larger support pore size and lower PFPE content had higher membrane distillation flux.And for stability tests(testing the 0.22μm membrane coated by 5%(mass)PFPE),the highest MD flux29.08 kg·m^(-2)·h^(-1) and stable salt rejection(over 99.99%)during the period.Except that,the effects of coating material concentration and pore sizes of substrate membrane were also investigated for surface morphology and topography,porosity,mechanical strength and pore size characteristics.This work provided a simple and effective alternative to prepare excellent hydrophobic composite membranes for MD applications. | Jun Pan Xianli Xu Zhaohui Wang Shi-Peng Sun Zhaoliang Cui Lassaad Gzara Iqbal Ahmed Omar Bamaga Mohammed Albeirutty Enrico Drioli | 2022 | Chinese Journal of Chemical Engineering2022，35，5： | 1 |
| 20 | Nonlinear dynamics of a two-stage gear system with mesh stiffness fluctuation, bearing flexibility and backlash显示文摘 | Lassaad Walha Tahar Fakhfakh Mohamed Haddar | 2008 | Mechanism and Machine Theory2008，，5： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员