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The Characteristic of Sound Reflections from Curved Reflective Panels

Szeląg A., Kamisiński T., Lewińska M., Rubacha J., Pilch A.

Archives of Acoustics

2014

Vol. 39, No. 4

549--558

The paper presents the verification of a solution to the narrow sound frequency range problem of flat reflective panels. The analytical, numerical and experimental studies concerned flat panels, panels with curved edges and also semicircular elements. There were compared the characteristics of sound reflected from the studied elements in order to verify which panel will provide effective sound reflection and also scattering in the required band of higher frequencies, i.e. above the upper limit frequency. Based on the conducted analyzes, it was found that among some presented solutions to narrow sound frequency range problem, the array composed of panels with curved edges is the most preferred one. Nevertheless, its reflection characteristic does not meet all of the requirements, therefore, it is necessary to search for another solution of canopy which is effective over a wide frequency range.

Analiza porównawcza modeli pracy rzecznika prasowego i oficera wywiadu

Lewińska M.

Zeszyty Naukowe AON

2013

nr 2(91)

195-215

Information resources possessed by the spokesman of a particular institution are decisive factors determining competent and effective execution of his or her activities. Every day’s work of spokesman focuses on collection and skillful selection of information which are being consecutively processed and disseminated. Firstly, the legal acts regulating responsibilities of the spokesmen and public information officers (public affairs officers) in the national defence sector (military press officers/representatives) do not include directives related to the problem of gathering the information by the press teams (public affairs teams). Moreover, there is a lack of specific guide lines on methods, techniques and tools that are applicable in this field of interest. Considering the above mentioned facts, this publication is an attempt to answer the question: can the informational model used by the spokesmen or press officers be integrated with an analogical model of intelligence officer’s or analyst’s?.