Results 201 to 210 of about 37,123 (265)

Passive eDNA Sampling Characterizes Fish Community Assembly in the Lancang River of Yunnan, China. [PDF]

Biology (Basel)
Ding L, Duan X, Liu M, Chen D, Huang X, Wang D, Ma B, Fu S, Zhong L.   +8 more
europepmc   +1 more source

The Indoor Microbiome: Sampling, Analysis and Emerging Trends. [PDF]

Environ Microbiol Rep
Šunić I, Šarac J, Havaš Auguštin D, Pozdniakova S, Ferguson RMW, Jergović M, Visentin D, Borràs S, Archer E, Henderson DK, Vitko S, Ašić A, Bošnjaković A, Maglica Ž, Viegas C, Novokmet N, Karlović N, Marjanović D, Muszyński A, Liu Y, Karisola P, Alenius H, Krych L, Lovrić M.   +23 more
europepmc   +1 more source

Spatial distribution of persistent components of particulate matter near a hazardous waste thermal treatment facility. [PDF]

Environ Pollut
Guo C, Ogunmusi O, Mathieu-Campbell ME, Lard M, Blanchard T, Khachatryan L, Vallee B, Subra W, Cormier SA, Lomnicki S, Richmond-Bryant J.   +10 more
europepmc   +1 more source

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Matrix filters for passive sonar

2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002
This paper introduces matrix filters as a tool for localization and detection problems in passive sonar. The outputs of an array of sensors, at some given frequency, can be represented by a vector of complex numbers. A linear filtering operation on the sensor outputs can be expressed as the multiplication of a matrix (called a matrix filter) times this
Vaccaro, Richard J., Harrison, Brian F.
openaire   +2 more sources

Quasi-passive filter for harmonic filtering

Electric Power Systems Research, 2008
To overcome the limitations of conventional shunt passive filters, a quasi-passive filter has been proposed in this paper. It comprises of a parallel and series tuned LC tank circuit. Unlike the conventional shunt passive filter, the quasi-passive filter utilizes a large value ac capacitor.
R. Mahanty, A.K. Kapoor
openaire   +1 more source

Research on Active Filters and Passive Filters.

Science and Technology of Engineering, Chemistry and Environmental Protection
Active filters have been a cornerstone of electronic engineering since their inception in the mid-20th century. As technology has advanced, these components have become increasingly sophisticated and integral to a wide range of applications, from audio equipment to telecommunications. This article introduces two types of active filters, active low-pass
Haoyu Wang, Haoran Zhang
openaire   +1 more source

Analysis and Design of Passive Polyphase Filters

IEEE Transactions on Circuits and Systems I: Regular Papers, 2008
Passive RC polyphase filters (PPFs) are analyzed in detail in this paper. First, a method to calculate the output signals of an n-stage PPF is presented. As a result, all relevant properties of PPFs, such as amplitude and phase imbalance and loss, are calculated.
Ryynänen Jussi, Stadius Kari, Halonen Kari A I, Kaukovuori Jouni   +3 more
openaire   +1 more source

An investigation on the selection of filter topologies for passive filter applications

IEEE PES General Meeting, 2009
Passive filters have been a very effective solution for power system harmonic mitigation. These filters have several topologies that give different frequency response characteristics. The current industry practice is to combine filters of different topologies to achieve a certain harmonic filtering goal.
A.B. Nassif, null Wilsun Xu, W. Freitas
openaire   +1 more source