Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Nitrogen Deposition Influences the Allelopathic Effect of an Invasive Plant on the Reproduction of a Native Plant : Solidago canadensis versus Pterocypsela laciniata

Wang C., Liu J., Xiao H., Zhou J., Du D.

Polish Journal of Ecology

2017

Vol. 65, nr 1

87--96

This study aims to gain insights into the allelopathic effects (by using leaf extracts) of the notorious invasive Solidago canadensis L. on seed germination of the associated Pterocypsela laciniata (Houtt.) C. Shih under different nitrogen (N) forms added: inorganic (NO3- -N and NH4+ -N), organic (urea-N), and mixed N (a mixture of the three N forms at 1:1:1 ratio). Among the two used concentrations of S. canadensis leaf extracts the higher exhibited inhibitory allelopathic effects on seedling height and biomass, germination potential, germination index, and vigor index of P. laciniata. N demonstrated positive effects on seed germination of P. laciniata. The effects of mixed and organic N on the seedling biomass of P. laciniata were more pronounced than those of inorganic N and control treatment. The vigor index of P. laciniata under mixed N was significantly higher than those under single N form and control treatment. Thus, organic and mixed N showed higher ecological effects on seed germination of P. laciniata than inorganic and single N form. All N forms could alleviate the inhibitory allelopathic effects of S. canadensis on seed germination of P. laciniata. Overall, the inhibitory allelopathic impact of S. canadensis on seed germination of native species may be attenuated under increased and diverse N deposition, thus it could prevent its further invasion.

A Novel Vibration Monitoring System Based on Wireless Sensor Networks

Du D., He Q., He Z.

Przegląd Elektrotechniczny

2013

R. 89, nr 3b

35--37

Considering the application limitations of traditional vibration monitoring system, wireless vibration monitoring system is more needed especially for large-scale complex equipment, many measuring points, and widely distributed equipment of process industrial. According to the characteristic and demand of wireless sensor networks and vibration monitoring system, a new design method of wireless sensor network node used in equipment vibration condition monitoring was proposed. First of all, a miniature low-power sensor node for wireless vibration monitoring of equipment was developed. Then, a wireless vibration monitoring system based on wireless sensor networks was constructed. Finally, the general scheme of the system, the design ideas of node hardware and software, the strategies of wireless networking and communication as well as the monitoring software of the system are described. The results of experiment showed that the data sampled by wireless vibration monitoring node is correct, the communication of network system is accurate, and the whole system is reliable. The system therefore can be widely used in vibration monitoring of various equipment, particularly useful in electric power, metallurgy, petrochemical and other widely distributed equipments.

W artykule zaproponowano metodę tworzenia węzła sieci czujników bezprzewodowych, na potrzeby systemu monitorowania wibracji. Przedstawiony został sposób projektowania oraz schemat finałowego systemu, z opisem strony sprzętowej i programowej. Przedstawione wyniki badań eksperymentalnych potwierdzają skuteczność i poprawność działania.