Smart agriculture based on new types of sensors, data analytics and automation, is an important enabler for optimizing yields and maximizing efficiency to feed the world’s growing population while limiting environmental pollution. The aim of this paper is to describe a multi-sensor Internet of Things (IoT) system for agriculture consisting of a soil probe, an air probe and a smart data logger. The implementation details will focus of the integration element and the innovative Artificial Intelligence based gas identification sensor. Furthermore, the paper focuses on the analytics and decision support system implementation that provides farming recommendations and is enhanced with a feedback loop from farmers and a social trust index that will increase the reliability of the system.

Thermoplastic polymeric materials used in the case of friction couplings with sliding movement such as guides, bearings, linear bearings, must have good tribological properties related to friction and wear. Indication of these characteristics is a convenient means for faster characterization of the tribological behavior of any pair of materials when operating conditions are changed.The paper presents a comparative study of the friction characteristics for two thermoplastic polymeric materials (Relamid B-10-FC and Turcit B Slydway) that slide on a metal surface in dry or oil-lubricated environments.The evolution of the coefficient of friction for a non-compliant and a conforming contact under different operating and lubrication conditions was analyzed. The experimental research was done on a stand of pin on disk tribological tests illustrating graphically the evolution of the coefficient of friction with the load, speed and time for different surface roughness. The values of the normal experimental forces used to act on the pin were: F_n1=0.5N, F_n2=1N, F_n3=5N, F_n4=10N. The rotational speed of the disc can be changed using a variable speed drive. Experimental sliding speeds were: v_1=0.02m/s,v_2=0.04m/s,v_3=0.06m/s și v_4=0.08m/s. The temperature and humidity of the experimental conditions were as well 18°...22° and 60...70%. Each experiment was evaluated for a period of 30 min. The results of this research can be used to design high-performance mechanical systems to improve the various mechanical processes in which friction phenomena occur.