Search Results

You are looking at 1 - 9 of 9 items for :

  • Control Engineering, Metrology and Testing x
Clear All
Open access

A. Dočekal, V. Dynybyl, M. Kreidl, R. Šmíd and P. Žák

Localization of the Best Measuring Point for Gearwheel Behaviour Testing Using Group of Adaptive Models Evolution

This paper deals with signal processing for vibration analysis of the gear transmission. The main goal was localization of the best measuring point on the gearbox housing, which could provide the highest sensitivity to gearwheels vibration. Vibration measured at some selected points on the gearbox housing was analysed using methods of spectral analysis. The important frequencies in the vibration spectra and a value of their importance were estimated using Group of Adaptive Models Evolution. This work was done within the framework of experimental research concerned with testing and lifetime estimation of new designs of gearwheels. The lifetime of an examined gearwheel, which is mainly related to rise of pitting faults, was assessed by monitoring of a gearwheel vibration level.

Open access

Wang Tong, Wu Jiyi, Xu He, Zhu Jinghua and Charles Munyabugingo

In the routing protocol for wireless sensor network, the cluster size is generally fixed in clustering routing algorithm for wireless sensor network, which can easily lead to the “hot spot” problem. Furthermore, the majority of routing algorithms barely consider the problem of long distance communication between adjacent cluster heads that brings high energy consumption. Therefore, this paper proposes a new cross unequal clustering routing algorithm based on the EEUC algorithm. In order to solve the defects of EEUC algorithm, this algorithm calculating of competition radius takes the node’s position and node’s remaining energy into account to make the load of cluster heads more balanced. At the same time, cluster adjacent node is applied to transport data and reduce the energy-loss of cluster heads. Simulation experiments show that, compared with LEACH and EEUC, the proposed algorithm can effectively reduce the energy-loss of cluster heads and balance the energy consumption among all nodes in the network and improve the network lifetime

Open access

J. Hrabina, O. Acef, F. du Burck, N. Chiodo, Y. Candela, M. Sarbort, M. Hola and J. Lazar

. III. - Experiments on magnetic predissociation. Journal de Physique, 42 (7), 961-978. [41] Pique, J.P., Bacis, R., Hartmann, F., Sadeghi, N., Churassy, S. (1983). Hyperfine predissociation in the B state of iodine investigated through lifetime measurements of individual hyperfine sublevels. Journal de Physique, 44 (3), 347-351.

Open access

Robertas Damaševičius, Vytautas Štuikys and Jevgenijus Toldinas

Abstract

Mobile devices have become an integral part of our life and provide dozens of useful services to their users. However, usability of mobile devices is hindered by battery lifetime. Energy conservation can extend battery lifetime, however, any energy management policy requires accurate prediction of energy consumption, which is impossible without reliable energy measurement and estimation methods and tools. We present an analysis of the energy measurement methodologies and describe the implementations of the internal (profiling) software (proprietary, custom) and external software-based (Java API, Sensor API, GSM AT) energy measurement methodologies. The methods are applied to measure energy consumption on a variety of mobile devices (laptop PC, PDA, smart phone). A case study of measuring energy consumption on a mobile computer using 3DMark06 benchmarking software is presented

Open access

Maciej Frankiewicz, Adam Gołda and Andrzej Kos

References [1] Biber, C., Coleman, C. (2010). ASIC Package Lid Effects on Temperature and Lifetime. Proc. 26th Ann. IEEE Semiconductor Thermal Measurement and Management Symp. SEMI-THERM, 187−192. [2] Bieszczad, G., Kastek, M. (2011). Measurement of Thermal Behavior of Detector Array Surface with the Use of Microscopic Thermal Camera. Metrol. and Meas. Syst. Vol. XVIII No. 4, 679−690. [3] Frankiewicz, M., Kos, A. (2012). Overheat Protection Circuit for High Frequency Processors. Bul. Pol. Ac. Sc. Techn. Ser. Vol

Open access

Mohammad Arkani, Hossein Khalafi, Naser Vosoughi and Samad Khakshournia

References [1] Arkani, M., Hassanzadeh, M., Khakshournia, S. (2016). Calculation of six-group importance weighted delayed neutron fractions and prompt neutron lifetime of MTR research reactors based on Monte Carlo method. Progress in Nuclear Energy , (88), 352–363. [2] Thie, J.A. (1963). Reactor Noise . New York: Rowman and Littlefield Inc. [3] Uhrig, R.E. (1970). Random Noise Techniques in Nuclear Reactor Systems . New York: The Ronald Press Company. [4] Williams, M.M.R. (1974). Random Process in Nuclear Reactors . Pergamon Press

Open access

Krzysztof Skorupski

: Relation between morphology and physical properties. J. Colloid Interface Sci., 229(1), 261-273. [22] Skorupski, K., Mroczka, J., Wriedt, T., Riefler, N. (2014). A fast and accurate implementation of tunable algorithms used for generation of fractal-like aggregate models. Physica A, 404, 106-117. [23] Van Poppel, L.H., Friedrich, H., Spinsby, J., Chung S.H., Seinfeld J.H., Buseck P.R. (2005). Electron tomography of nanoparticle clusters: Implications for atmospheric lifetimes and radiative forcing of soot. Geophys. Res. Lett., 32(24), 1

Open access

Jingsong Li, Andreas Reiffs, Uwe Parchatka and Horst Fischer

the Southern Atlantic boundary layer: unexpected deviations of photochemical steady state. Atmos. Chem. Phys., 11, 8497‒8513. [28] Hastie, D. R., Shepson, P. B., Reid, N., Roussel, P. B., Melo, O. T. (1996). Summertime NOx, NOy, and ozone at a site in rural Ontario. Atmos. Environ., 30, 2157‒2165. [29] Browne, E. C., Cohen, R. C. (2012). Effects of biogenic nitrate chemistry on the NOx lifetime in remote continental regions. Atmos. Chem. Phys., 12, 11917‒11932. [30] Aneja, D.S. Kim, W.L. (1997). Chameides, Trends and

Open access

Béla Genge and Călin Enăchescu

Abstract

The expansion of Internet has led to a variety of directly accessible devices and services. Nowadays, companies tend to increase the number of Internetfacing services in order to ensure higher visibility, and accessibility towards end-users. Nonetheless, this profound expansion towards an “Internet of Things” brings new opportunities to malicious actors. As a result, novel cyber-physical attacks bring new challenges to systems administrators in order to accommodate traditional user requests with security prerequisites. Therefore, in this paper we propose a novel approach for historical Internet connectivity assessment of services. The technique uses the output of the popular Shodan search engine to infer the lifetime of different Internet-facing services. Experimental results conducted on IP address blocks attributed to six different institutions distributed across four sectors (university, telecommunications, banking, and power) show different possible service lifetime patterns.