The possibility of a normal distribution indicates that few particles are in the same phase during a breath and their reflections can be observed on the chest wall, then a few explosive waves with relatively large power occurr occasionally. Therefore, the one-cycle sine wave which is simulated as a single burst of the explosive effect phenomenon penetrates through the chest wall and was analysed to explore the reason of the crackle sounds. The results explain the differences between the definitions of crackle proposed by Sovijärvi et al. (2000a). The crackles in the lungs were synthesised by a computer simulation. When the coarse crackles occur, the results indicate that higher burst frequency carriers (greater than 100 Hz) directly penetrate the bandpass filter to simulate the chest wall. The simulated coarse crackle sounds were low pitched, with a high amplitude and long duration. The total duration was greater than 10 ms. However, for a lower frequency carrier (approximately 50 Hz), the fundamental frequency component was filtered out. Therefore, the second harmonic component of the lower frequency carrier, i.e., the fine crackle, penetrated the chest wall. Consequently, it is very possible that the normal lung sounds may contain many crackle-shaped waves with very small amplitudes because of the filtering effects of the chest wall, environment noises, electric devices, stethoscopes, and human ears, the small crackles disappear in the auscultations. In addition, our study pointed out that some unknown crackles of the very low frequency under the bandwidth of the human ears cannot penetrate the airways and be detected by medical doctors. Therefore, it might be necessary to focus advanced electronic instrumentation on them in order to analyse their possible characteristics for diagnosis and treatment of the respiration system.

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.

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.

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.