北电网络（Nortel Networks），是由北方电讯（Northern Telecom Limited）及海湾网络（Bay Networks）在1998年所合并而成的公司，为加拿大著名电讯设备供应商，是光网络、GSM/UMTS、CDMA、WiMAX、IMS、企业通信平台等领域的世界领先供应商。
The paper research, calculates, and designs an industrial electric drive system control such as: computer numerical control (CNC) machining machines, milling machines, and grinding machines, with sensorless permanent magnet synchronous motors (PMSM) based on measuring current components, axial position and applied voltage to obtain information about rotation angle and speed for PMSM based on adaptive sliding mode control (ADSMC) method. Here an optimal sliding surface will be designed to demonstrate faster convergence than conventional sliding mode control. Then, an adaptive law is researched and developed to make the control parameters, especially the switching gain, updated quickly online. Therefore, the motor noise can be effectively reduced and the system can be better eliminated from noise, Chattering, and nonlinear noise. Finally, a reference model was created, the exponential decay curve was applied to track the angular position error. The ADSMC system with model reference proposed by the authors in the paper has combined the advantages of sliding mode control method and adaptive control method according to the sample model. The simulation results show that the performance is achieved faster and the control process is more accurate, the error of speed and angular position (less than 0.01%) compared to other control methods.
O presente texto é consequência da reflexão crítica realizada sobre o texto ‘O currículo e os desafios do futuro’ apresentado na I Conferência Nacional sobre o Capital Humano, por Maria Barbosa, presidente do Instituto Superior de Ciências da Educação de Benguela. A reflexão enquadra-se no âmbito da UC Supervisão Pedagógica do curso de doutoramento em Metodologia do Ensino Primário e se consubstancia num espaço de desenvolvimento de análises de artigos aos doutorandos do curso de Metodologia do Ensino Primário, no ISCED-Benguela. Ela apoia-se na análise documental e na consulta bibliográfica. Por fim, é evidenciado o papel do currículo na determinação do tipo de sociedade que se pretende, o que torna importante o seu alinhamento às tendências nacionais e supranacionais actuais e futuras.
