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MASOUD YAZDANI 《Expert Systems》1986,3(3):154-163
Abstract: In this paper we look at the evolutionary development of Computer Assisted Instruction from the early days of ‘linear programs’ up to the use of ‘expert systems’ in education and training. We present the basic principles of Intelligent Tutoring Systems (ITS) which are capable of rich interaction with the student, which know how to teach, and who and what they are teaching. We point out the need for knowledge representation formalisms which can support ITS and present one such formalism (production systems). In the framework presented we describe systems developed for the teaching of modern languages, electronic trouble shooting and computer programming. Finally we point out the shortcomings of ITS and identify areas where a consensus of opinion does not exist. 相似文献
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The aim of this work was to study different hybrid photovoltaic-thermal (PVT) collectors. Numerical simulation of the collectors was carried out using a 3-dimensional computational fluid dynamic (CFD) model. A set of experiments was conducted using a box-type PVT collector to validate the obtained computed data. Simulation results for water outlet temperature, especially at the lower flow rates, were closer to the measured data compared with average module surface temperature. Based on the simulation results, the spiral flow designs of heat exchanger provided the most uniform temperature distribution for module surface and the highest temperature gradient was observed with the direct flow designs. A hot zone was generated on the module surface of the direct flow box-type collector and the results indicated that the hot zone was considerably declined using cross-fins inside the box-type heat exchanger. The highest heat transfer to the ambient occurred with the spiral flow design and the box type heat exchanger presented a relatively low heat losses. The cross-fined box type and the spiral flow designs of the PVT collector had the highest electrical efficiencies at the different test conditions. 相似文献
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A simulation model based on the concepts developed previously (Tien el. al. 1977, Wang el. al. 1977) for the deposition of particles from suspensions flowing past single spherical and cylindrical collectors is presented. The model is capable of providing detailed information about the formation and growth of particle deposits at the surface of the collector. Reasonably good agreement with experimental data was observed. 相似文献
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在现有的电力系统电压脆弱性评估方法中,存在单一指标难以反映全貌、基于权重的综合指标又过于主观的问题。文中根据已有的具有代表性的电压稳定指标,并结合节点重要性的信息,提出了基于超效率数据包络分析的多准则综合电压脆弱性评估方法以及相应的综合指标——相对电压脆弱性指标,用于辨识电网中的薄弱节点。在此基础上,还考虑了离群点的检验,以完善所提出的方法。最后,以江西电网作为算例进行了仿真分析,结果证明了所提出方法和指标的全面性、有效性和客观性。 相似文献
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MASOUD NAJAF NAJAFI SEYED ALI MORTAZAVI ARASH KOOCHEKI JAFAR KHORAMI BOULBABA REKIK 《International Journal of Dairy Technology》2009,62(1):19-26
Relationships between total bulk milk somatic cell score (SCS) and milk fat and protein contents and acidity were investigated in the Khorasan Razavi Province, a region that contributes 6.83% of total milk production in Iran. A total of 1476 samples were analysed. Data were obtained by randomly collecting 123 samples of bulk tank milk from 41 dairy farms during April 2006 to March 2007, every month. Milk was analysed for titratable acidity, protein and fat contents and somatic cell counts (direct microscopic cell count and with Somatos, Russia). Microscopic and Somatos somatic cell counts were comparable. Results showed that the season of raw milk production did not have a significant effect on acidity. Milk fat content increased gradually from spring to winter and there were significant differences ( P < 0.05) between spring and other seasons. Higher levels of milk protein fractions were observed during the autumn and winter than in other seasons. The highest total bulk milk somatic cell counts were observed in July. Total bulk milk SCS had significant effects ( P < 0.05) on acidity and fat and protein contents. Moreover, the level of acidity and fat in milk decreased with increasing SCS. A significant positive relationship was observed between total bulk milk SCS and the protein content of milk. Elevated SCS were associated with lowered milk quality in Holsteins in the Khorasan Razavi Province. 相似文献
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Highly crystalline TiO2 anatase nanoparticles were synthesized via gel–sol method by using titanium isopropoxide and triethanolamine. The products
were characterized by X-ray diffraction, transmission electron microscopy, thermogravimetric/differential thermal analysis
and nitrogen gas absorption methods. The particle size ranged from 7 to 24 nm having specific surface area of 64 to 220 m2/g. Selective Ti(OH)4 gel specifications and hydrothermal test conditions resulted in thermodynamically-stable phase-formation. Aging at 130°C
for 4 h resulted in particle size of 7 nm; while at 130 and 160°C for 12 h resulted in 12 and 21 nm, respectively. 相似文献
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随着电网管制的放松与大互联系统的持续发展,关于高效实用的跨区域可用传输能力(ATC)计算方法的研究十分重要。现有的ATC计算方法面对跨区域ATC计算,存在海量信息汇集困难、互联系统计算规模庞大、计算耗时等问题。文中提出了一种基于Kron简化的ATC计算方法,通过系统分解、区域等效、数据交换和拓扑校正等4个步骤,实现了跨区域ATC的分布式计算,避免了大规模运行数据的集中处理,分摊了跨区域ATC的运算压力;同时利用改进型灵敏度分析法,在保证ATC在线计算时效性的前提下提高了计算精度。最后,采用IEEE 118节点算例验证了新算法的有效性。 相似文献
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FATEMEH BAGHBANI FATHOLLAH MOZTARZADEH LEILA HAJIBAKI MASOUD MOZAFARI 《Bulletin of Materials Science》2013,36(7):1339-1346
Bioactive glasses in the systems SiO2–CaO–P2O5–MgO (BGZn0) and SiO2–CaO–P2O5–MgO–ZnO (BGZn5), were prepared by sol–gel method and then characterized. Surface reactivity was studied in simulated body fluid (SBF) to determine the effect of zinc (Zn) addition as a trace element. The effect of Zn addition to the glass matrix on the formation of apatite layer on the glass surface was investigated through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT–IR) and scanning electron microscopy (SEM). Also, inductively coupled plasma–optical emission spectroscopy (ICP–sOES) was used to determine the concentrations of released ions in SBF solution after different time intervals in SBF solution. The antibacterial activity of Zn containing glass against Pseudomonas aeruginosa was measured by the halo zone test. The presence of Zn in glass composition improved chemical durability, slowed down the formation rate of Ca–P layer and decreased the size of crystalline apatite particles. Zn containing glass exhibited an excellent antibacterial activity against P. aeruginosa which could demonstrate its ability to treat bone infection. 相似文献