Lukasz Makowski

Deposition of Fractal-Like Aerosol Aggregates in a Model of Human Nasal Cavity

Toxicity of diesel exhaust is related to the inhalation of nano-sized fractal-like aerosol aggregates. Their complex behavior (in comparison to spherical particles) should be taken into account in deposition modeling. The deposition of aerosol fractal-like aggregates in the model of a human nose was studied numerically for the flow rate corresponding to breathing conditions. The simplified geometry of the human nasal replica was implemented in the computational fluid dynamics (CFD) code (FLUENT) used for calculation of the three-dimensional airflow structure. A Brownian dynamic (BD) algorithm was applied for determination of the aggregates deposition in the nasal cavity during inhalation. These calculations were carried out for several populations of aggregates. The values of parameters used in the BD simulations for characterization of fractal-like aggregates, that is, fractal dimension (Df) and the radius of gyration (Rg), were in the range of 1.7–2.1 and 0.24–0.36 μm, respectively. These are the representative values for soot aggregates emitted from diesel engines. The results of computation show approximately 20% penetration of submicrometer aggregates through the nose and a weak dependence of deposition efficiency on Df and Rg values. The proposed methodology may lead to a more realistic description of deposition of nonspherical aerosol particles in the respiratory system. A more sophisticated approach for description of fractal-like aggregates dynamics is suggested for future studies.

Mobile-Observation-Point-Selected Aspects in Design and Signal Transmission

We present the mobile observation point (MOP) and a system for monitoring hydrocarbons. This paper describes the technical problems in the development of the monitoring system and the MOP. We pay particular attention to procedures that predict measurement results and issue alerts about oil spills in water. This paper gives a comparison between the transmission performance of a binary stream and the Jabber protocol. Finally, we discuss the advantages and disadvantages of the proposed solutions.

Instrumentationnotes - Distributed measurement systems-A web system approach: Part I

The simplified field-system functionality testing software (FSFTS) was presented. That software was successfully used for verification of the final system functionality and the quality evaluation of its components. Then, two solutions for the server/client software for the distributed measurement system, implementing the Web as a main transmission medium, were described. The essential parts of the final system solutions are the server and the clients. The server collects remote data and makes them accessible for clients. These two solutions of the server/client system are based on a Windows operating system. The first solution implements Microsofts .NET environment. The second one uses WAMP (Windows and free and open source software: Apache, MySQL, and PHP). The main difference between the first two solutions is how the client page is generated. The .NET case is only on the server side, and the WAMP case is on both server and client sides. Both systems produce a map/plot/ table showing the system data to the user through web browsers.

Communication with nodes of distributed measurement system for hydrocarbon pollution monitoring using Jabber protocol

In this paper a problem of using extensible protocol in distributed measurement system is addressed. It is assumed that system is being built upon TCP/IP networks such as local area networks or wide area networks and the Internet. XMPP, which stands for extensible messaging and presence protocol, is a standarized Internet protocol based on XML. It is the protocol that is used for message passing subsystem in described project. In this article some performance measurements and throughput limits are shown.