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In ten of his works, Al-Fārābī discusses ousia/substance and its derivatives. Among these works, we frequently encounter quotations from Aristotle and Al-Fārābī's interpretation of them. He accepts the established meaning of ousia as substance and doesn't argue against its translation to maujūd, Eyn, maahiy[y]at and ẕāt. This article tries to show the similarities and differences between Al-Fārābī and Aristotle conceptions of substance and then to bridge between the two innovative theories of Al-Fārābī: one in his division of existence and another regarding his view on reality. In discussing the concept of substance, Farabi seeks to create a unity between Plato and Aristotle's views. In another way, this claim can be expressed that Farabi aims to create a unity between the book of metaphysics and Aristotle's treatise on categories. In this direction, his innovative theory of substance is born. Also, this paper shows some inconsistencies existing in his discussion, which makes his philosophical language even more ambiguous than Aristotle's in Metaphysics and subject to various interpretations. Finally, the relation between the concept of substance and the concepts of shai and tashakhkhos is discussed.

Accurate measurements of global solar radiation, atmospheric temperature and relative humidity, as well as the availability of the predictions of their evolution over time, are important for different areas of applications, such as agriculture, renewable energy and energy management, or thermal comfort in buildings. For this reason, an intelligent, light-weight, self-powered and portable sensor was developed, using a nearest-neighbors (NEN) algorithm and artificial neural network (ANN) models as the time-series predictor mechanisms. The hardware and software design of the implemented prototype are described, as well as the forecasting performance related to the three atmospheric variables, using both approaches, over a prediction horizon of 48-steps-ahead.