A π-phase-shifted fiber Bragg grating (π-FBG) shows high sensitivity to the ultrasonic (US) wave as compared to the conventional FBG due to the strong slow-light phenomenon at the resonance peak. However, its sensitivity is limited by the interrogation schemes. A combination of π-FBG and unbalanced fiber Mach– Zehnder interferometer (F-MZI) are theoretically analyzed and optimized for the highly sensitive acoustic sensor. The coupled-mode theory (CMT) and transfer matrix method (TMM) are used to establish the numerical modelling of π-FBG. For the optimized grating parameters of π-FBG, the proposed sensing system shows the high strain sensitivity of 1.2 × 108/ε, the highest dynamic strain resolution of 4.1fε/√Hz, and the highest wavelength shift resolution of 4.9 × 10−9 pm. Further, the proposed sensing system strongly supports both time andwavelength division multiplexing techniques. Therefore, the proposed sensing system shows extreme importance in single as well as quasi-distributed US acoustic wave sensing networks.
Small towns are an important element of settlement network. They change their status depending on, among others, the development of industry, and changes in the transportation system. Some of them lost civic rights, then regained them, and sometimes were incorporated into the neighboring agglomerations. Some small towns have merged together to create new structures in the settlement network. This article investigates this phenomenon on the example of south-west of Poland. It was also found that in several cases, a small town subsequently separated from the urban area and created a separate urban unit of its own.
The article contains an analysis of Boris and Gleb novel written by a contemporary Russian writer Y. Buida. The analysis is realized in reference to certain postmodern tendencies in literature. The author emphasizes mainly the dialogic character of postmodernism and depicts particular features of the movement in post-Soviet culture. Specifically, the dialogic character of the novel is realized through multilayer interferences of culture codes which suit the idea of chaosmic reality by Deleuze and Guatarri. Correspondingly, the dialogue is also displayed by the eclecticism of genders and styles.
Sulla metodologia di omiletica
Sommario
L’omiletica fa parte della teologia pratica. Essa ĺ una riflessione scientifica sulla predicazione della parola di Dio nella situazione d’oggi. L’omiletica viene suddivisa in fondamentale, materiale, formale e particolare. L’oggetto di studio omiletico sono: testi della Sacra Scrittura, documenti della Chiesa, testi teologici ed anche i testi delle omelie, prediche e conferenze, come anche, pi raramente, i dati dell’esperienza umana. I metodi della ricerca sono quelli applicati nelle scienze non teologiche; ále conclusioni derivati da questa ricerca hanno per sempre un carattere teologico.