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| 1 | Photosynthesis and growth responses of pea Pisum sativum L. under heavy metals stress显示文摘The present work aimed to study the physiological effects of cadmium (Cd) and copper (Cu) in pea (Pisum sativum). Pea plants were exposed to increasing doses of cadmium chloride (CdCl2) and copper chloride (CuCl2) for 20 d. The examined parameters, namely root and shoot lengths, the concentration of photosynthetic pigments and the rate of photosynthesis were affected by the treatments especially with high metals concentrations. The analysis of heavy metals accumulation shows that leaves significantly accumulate cadmium for all the tested concentrations. However, copper was significantly accumulated only with the highest tested dose. This may explain the higher inhibitory effects of cadmium on photosynthesis and growth in pea plants. These results are valuable for understanding the biological consequences of heavy metals contamination particularly in soils devoted to organic agriculture. | Sabrine Hattab Boutheina Dridi Lassad Chouba Mohamed Ben Kheder Hamadi Bousetta | 2009 | Journal of Environmental Sciences2009，21，11： | 16 |
| 2 | Nonlinear dynamics of a two-stage gear system with mesh stiffness fluctuation,bearing flexibility and backlash显示文摘 | Lassad Walha Tahar Fakhfakh Mohamed Haddar | 2009 | Mechanism and Machine Theory2009，，44： | 1 |
| 3 | Decolourization and detoxification of textile industry wastewater by the laccase-mediator system 显示文摘 | Rim K Lassad B Steve W | 2010 | Journal of Hazardous Materials2010，175，13： | 1 |
| 4 | Decolourization and detoxification of textile industry wastewater by the laccase-mediator system显示文摘 | Rim Khlifi Lassad Belbahri Steve Woodward | 2010 | Journal of Hazardous Materials2010，175，： | 1 |
| 5 | Measurement and sources of technical inefficiency in the tunisian citrus growing sector显示文摘 | BOUBAKER DHEHIBI LASSAD LACHAAL MOHAM- MED ELLOUMI EMNA B MESSAOUD | 2007 | Working Report2007，，3： | 1 |
| 6 | Nonlinear dynamics of a two-stage gear system with mesh stiffness fluctuation,bearing flexibility and backlash显示文摘 | Walha Lassad Fakhfakh Tahar Haddar Mohamed | | 0，，5： | 1 |
| 7 | Nonlineardynamics of a two-stage gear system with mesh stiffnessfluctuation,bearing flexibility and backlash显示文摘 | LASSAD W TAHAR F MOHAMED H | 2009 | Mechanism and Machine Theory2009，44，5： | 1 |
| 8 | Routings Cheduling of Vehicle and Crews : the States Art 显示文摘 | Bodin L Golden B D LAssad A | 1983 | Computer & Opertions Research1983，，10： | 1 |
| 9 | Decolourization and detoxication of textile industry wastewater by the laccase- mediator system 显示文摘 | KHLIFI Rim BELBAHRI Lassad | 2010 | Journal of Hazardous Materials2010，，175： | 1 |
| 10 | A Robust MPP Tracker Based on Sliding Mode Control for a Photovoltaic Based Pumping System显示文摘In this paper, a mathematical model of the photovoltaic(PV) pumping system s main components is firstly established.Then, the design of maximum power point tracking(MPPT) stage that ensures battery charging is described. This work is motivated by the need of photovoltaic generator(PVG) that efficiently extracts maximum power. The PVG is a special source of energy which has nonlinear current-voltage characteristics depending on variations in temperature and solar irradiance. In order to achieve the MPPT operating goals, a special interest is focused on the variable structure sliding mode(SM) control strategy and the classic perturb and observe(P&O) algorithm. The permanent magnet synchronous motor(PMSM) is selected as a pump driver. The field oriented control is performed as the motor drive strategy. Simulation results show a high level of efficiency, obtained with the proposed PV based pumping system. The performance comparison between SM controller and P&O controller has been carried out to demonstrate the effectiveness of the former in drawing more energy and a fast response against irradiation disturbances. | Farhat Maissa Oscar Barambones Sbita Lassad Aymen Fleh | 2017 | International Journal of Automation and computing2017，14，4： | 0 |
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