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Journal articles on the topic 'Ground filter'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Díaz Pardo, Iván Eduardo, Carlos Arturo Suárez Fajardo, and Gustavo Adolfo Puerto Leguizamón. "A study of the ground plane effect in passband filters using OSRR cells." DYNA 82, no. 193 (2015): 9–15. http://dx.doi.org/10.15446/dyna.v82n193.42550.

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This paper presents the study of the ground plane effect in passband filters using metamaterial cells in Open Split Ring Resonators (OSRR) structures on microstrip substrates. Three different configurations have been proposed, namely: by removing partially the ground plane of the OSRR cell back end, by windows design over the ground plane at the back end of each cell and by placing a full ground plane. The conducted analysis shows that the filter transmission response featuring a ground plane including windows proved to be the most flattened with the middle bandwidth of the three configuration

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2

Kitamura, Toshiaki. "Comb-Line Filter with Coupling Capacitor in Ground Plane." Active and Passive Electronic Components 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/919240.

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A comb-line filter with a coupling capacitor in the ground plane is proposed. The filter consists of two quarter-wavelength microstrip resonators. A coupling capacitor is inserted into the ground plane in order to build strong coupling locally along the resonators. The filtering characteristics are investigated through numerical simulations as well as experiments. Filtering characteristics that have attenuation poles at both sides of the passband are obtained. The input susceptances of even and odd modes and coupling coefficients are discussed. The filters using stepped impedance resonators (S

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3

Justa, Josef, Václav Šmídl, and Aleš Hamáček. "Fast AHRS Filter for Accelerometer, Magnetometer, and Gyroscope Combination with Separated Sensor Corrections." Sensors 20, no. 14 (2020): 3824. http://dx.doi.org/10.3390/s20143824.

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A new predictor–corrector filter for attitude and heading reference systems (AHRS) using data from an orthogonal sensor combination of three accelerometers, three magnetometers and three gyroscopes is proposed. The filter uses the predictor—corrector structure, with prediction based on gyroscopes and independent correction steps for acceleration and magnetic field sensors. We propose two variants of the filter: (i) one using mathematical operations of special orthogonal group SO(3), that are accurate for nonlinear operations, for highest possible accuracy, and (ii) one using linearization of n

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4

Nedelchev, M., and A. Kolev. "Synthesis of Planar Filters Using Defected Ground Structure Miniaturized Hairpin Resonators." Engineering, Technology & Applied Science Research 9, no. 1 (2019): 3734–38. http://dx.doi.org/10.48084/etasr.2424.

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This paper presents an effective technique to suppress the spurious passbands in planar filters by using defected ground structure (DGS) resonators etched in the ground plane. The proposed miniaturized hairpin DGS slot resonator is researched in terms of its resonance frequency, corresponding coupling topologies, and filter design. The resonator and the topologies of coupled DGS resonators are simulated in a fullwave electromagnetic (EM) simulator. Using a curve-fitting technique, useful design formulas are proposed for filter synthesis. Using the synthesis procedure, a 3rd order filter design

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Talybova, J. "Selection of Drainage and Evaluation Used Filter Media." Bulletin of Science and Practice 6, no. 3 (2020): 161–69. http://dx.doi.org/10.33619/2414-2948/52/16.

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The feature of running the suffosion of sand grounds in the top five-meter soil-ground layer where drainage is constructed on the basis of existing normative documents and granulo¬metric composition of filter material was determined with reports. The actual and report contents of the filter differ sharply. Large particles (40% by weight) of more than 20 mm should be sorted out from the sand-gravel ground to be used for construction of drainage.

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6

Štular, Benjamin, and Edisa Lozić. "Comparison of Filters for Archaeology-Specific Ground Extraction from Airborne LiDAR Point Clouds." Remote Sensing 12, no. 18 (2020): 3025. http://dx.doi.org/10.3390/rs12183025.

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Identifying bare-earth or ground returns within point cloud data is a crucially important process for archaeologists who use airborne LiDAR data, yet there has thus far been very little comparative assessment of the available archaeology-specific methods and their usefulness for archaeological applications. This article aims to provide an archaeology-specific comparison of filters for ground extraction from airborne LiDAR point clouds. The qualitative and quantitative comparison of the data from four archaeological sites from Austria, Slovenia, and Spain should also be relevant to other discip

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7

Smith, P. G., A. Gaber, I. Hattab, and H. A. Halim. "A Study into the Removal of Iron from Ferruginous Ground Water Using Limestone Bed Filtration." Water Science and Technology 27, no. 9 (1993): 23–28. http://dx.doi.org/10.2166/wst.1993.0174.

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A pilot plant consisting of limestone bed filtration and sand filtration has been built 15 km south of Cairo to serve about 400 people. The pilot plant consists of 3 limestone filter units operated in series and two sand filters. The limestone filters are 1.3 m × 1.3 m and have a media depth of 1.15 m, a liquid depth of 0.5 m plus 0.35 m free board. The pilot plant started operation in April 1991 and the initial operation of the pilot plant has shown that a packed limestone filter unit is a simple and cheap method of removing iron from ferruginous groundwater. The initial results have shown th

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8

Canjar, R. Michael. "Small filter forcing." Journal of Symbolic Logic 51, no. 3 (1986): 526–46. http://dx.doi.org/10.2307/2274011.

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Qλ is the set of nonprincipal filters on ω which are generated by fewer than λ sets, for λ a fixed uncountable, regular cardinal ≤ c. We analyze forcing with Qλ, where Qλ is partially ordered in such a way that a filter F1 is more informative than F2 iff F1 includes F2. Qλ-forcing adjoins an ultrafilter on ω but adds no new reals. We analyze Qλ-forcing from a forcing-theoretic viewpoint. We also analyze the properties of Qλ-generic ultrafilters. These properties are independent of ZFC and depend very much on the ground model. In particular, we study Qλ-forcing over ground models which are Cohe

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9

Li, Yong-An. "Synthesis for Butterworth Filter Using Compact VDTA Based on Sallen- Key Topology." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 5 (2020): 681–88. http://dx.doi.org/10.2174/2352096512666191004123213.

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Background: The original filter including grounded or virtual ground capacitors can be synthesized by using the NAM expansion. However, so far the filters including floating capacitor, such as Sallen-Key filter, have not been synthesized by means of the NAM expansion. This is a problem to be researched further. Methods: By using the adjoint network theory, the Sallen-Key filter including floating capacitor first is turned into a current-mode one, which includes a grounded capacitor and a virtual ground capacitor. Then the node admittance matrix, after derived, is extended by using NAM expansio

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10

Dastkhosh, Amir Reza, Gholamreza Dadashzadeh, and Mohammad Hossein Sedaaghi. "New Design Method of UWB Microstrip Filters Using Adaptive Genetic Algorithms with Defected Ground Structures." International Journal of Microwave Science and Technology 2010 (May 12, 2010): 1–9. http://dx.doi.org/10.1155/2010/671515.

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The effects of adaptive genetic algorithms (AGAs) and defected ground structures (DGSs) on performance optimization of tapered microstrip filter are investigated. The proposed structure achieves an ultra wide stopband with high attenuation within a small surface area, as well as 45% smaller size, in comparison with conventional filters. The parameters of the filter are optimized using in-home AGA code. In the proposed AGA algorithm, the crossover and mutation probabilities are adaptively changed according to the value of individual fitness. Then by utilizing the proposed DGS, a compact S-band

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11

Kumar, A., R. Patel, and M. V. Kartikeyan. "Investigation on Microstrip Filters with CSRR Defected Ground Structure." Advanced Electromagnetics 5, no. 2 (2016): 28. http://dx.doi.org/10.7716/aem.v5i2.353.

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This paper consists the design studies of complementary split ring resonator (CSRR) defected ground structure (DGS) microstrip filter with low insertion loss in the passband and high rejection in stopband with a comparison of various CSRR-DGS structure has been proposed. Various parameters of microstrip filters have been studied with CSRR-DGS such as roll off rate, bandwidth, effective inductance and capacitance. On the basis of these studies, microstrip low-pass, bandpass and dual-band bandstop filters have been designed and realized with enhanced properties of filters.

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12

Zheng, Jihong, and Meiguo Gao. "Tracking Ground Targets with a Road Constraint Using a GMPHD Filter." Sensors 18, no. 8 (2018): 2723. http://dx.doi.org/10.3390/s18082723.

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The Gaussian mixture probability hypothesis density (GMPHD) filter is applied to the problem of tracking ground moving targets in clutter due to its excellent multitarget tracking performance, such as avoiding measurement-to-track association, and its easy implementation. For the existing GMPHD-based ground target tracking algorithm (the GMPHD filter incorporating map information using a coordinate transforming method, CT-GMPHD), the predicted probability density of its target state is given in road coordinates, while its target state update needs to be performed in Cartesian ground coordinate

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Ertay, Agâh Oktay, Mehmet Abbak, and Serkan Şimşek. "An improved stopband and sharp roll off microstrip low pass filter with defected ground structures." International Journal of Microwave and Wireless Technologies 8, no. 3 (2015): 573–81. http://dx.doi.org/10.1017/s175907871500094x.

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In this paper a novel low pass filter (LPF) design procedure is proposed for electromagnetic bandgap based microstrip filters without using classical filter design approach. LPF is designed for ultra-wide stopband and sharp roll-off rate via proposed design procedure. It has been shown that finite periodic fan-shaped defected ground structures (FSDGSs) and double radial stubs (DRSs) yield broad stopband and very sharp transition band. The proposed LPF has −3 dB passband from dc to 1.49 GHz, and −20 dB broad stopband from 1.65 GHz up to 7.41 GHz. Full wave electromagnetic (EM) simulation of the

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14

Беляев, Б. А., С. А. Ходенков, И. В. Говорун та А. М. Сержантов. "Микрополосковые фильтры с широкими полосами пропускания". Письма в журнал технической физики 47, № 7 (2021): 30. http://dx.doi.org/10.21883/pjtf.2021.07.50796.18581.

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New microstrip designs of bandpass filters based on a low-pass filter was developed. Several or all the sections of high-impedance microstrip lines of the designed filters were connected to the ground by stubs. The filters have high frequency-selective properties, and their fractional bandwidths are in the range of 30 % –150 %. An experimental sample of a filter with a 2 GHz central frequency of the passband and 70% fractional bandwidth was made on an alumina substrate 1 mm thick. The filter has a substrate area of 46 × 21 mm2. Good agreement of the measured frequency response of the filter wi

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15

Guo, Xing Long, Z. L. Wang, J. Huang, Z. J. Zhang, H. H. Yin, and H. F. Zhu. "Tunable Low-Pass MEMS Filter Using Defected Ground Structures (DGS)." Advanced Materials Research 712-715 (June 2013): 1798–801. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1798.

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In this paper, fully monolithic tunable millimeter-wave filters using defected ground structures (DGS) are proposed using the CPW-based periodic structures with novel multiple-contact MEMS switches. Millimeter-wave low-pass filters were designed, fabricated, and tested. The cascaded CPW-based periodic structures, with low-pass intrinsic filtering characteristics, are reconfigured into a self-similar single unit cell by the operation of the novel multiple-contact MEMS switches with single actuation. In the first order tuning, the 3-dB cut-off frequency changes from 8.2GHz to10.5GHz, and the sec

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16

Saatçilar, Ruhi, and Nezihi Canitez. "The lattice filter in ground‐roll suppression." GEOPHYSICS 59, no. 4 (1994): 623–31. http://dx.doi.org/10.1190/1.1443622.

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Seismic reflections are sometimes masked by Ray‐leigh‐type surface waves that are termed ground roll in seismic literature. An adaptive lattice filter is used to recover reflected signals contaminated by ground roll. Experiments on synthetic and field data showed that the adaptive lattice filter technique is very effective in ground‐roll elimination. In addition, the filter works as a whitening operator, compresses the signal, and increases the signal‐to‐noise ratio.

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17

Rakesh Kumar Maurya, Pradyot Kala, Reena Pant,. "DEFECTED GROUND COPLANAR MULTI-BAND-PASS MICROSTRIP FILTER." INFORMATION TECHNOLOGY IN INDUSTRY 9, no. 1 (2021): 64–68. http://dx.doi.org/10.17762/itii.v9i1.102.

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This paper presents a combination of an inductive coupling technique and coplanar ground plane microstrip filter. Here, inductive coupling technique is used to overcome the unwanted radiation loss generated by the gap between the co-planar ground plane and the transmission line which improves filter characteristics. A defected ground structure (DGS) is integrated with the proposed filter to achieve a tri-bandpass characteristic (1.85, 3.53, and 5 GHz) without hampering the filter performance. The experimental results of the proposed filter are found in good agreement with simulated results.

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18

Štroner, Martin, Rudolf Urban, Martin Lidmila, Vilém Kolář, and Tomáš Křemen. "Vegetation Filtering of a Steep Rugged Terrain: The Performance of Standard Algorithms and a Newly Proposed Workflow on an Example of a Railway Ledge." Remote Sensing 13, no. 15 (2021): 3050. http://dx.doi.org/10.3390/rs13153050.

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Point clouds derived using structure from motion (SfM) algorithms from unmanned aerial vehicles (UAVs) are increasingly used in civil engineering practice. This includes areas such as (vegetated) rock outcrops or faces above linear constructions (e.g., railways) where accurate terrain identification, i.e., ground filtering, is highly difficult but, at the same time, important for safety management. In this paper, we evaluated the performance of standard geometrical ground filtering algorithms (a progressive morphological filter (PMF), a simple morphological filter (SMRF) or a cloth simulation

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19

Li, Bao Ping, and Yan Liang Zhang. "Novel Low-Pass Microwave Filter Based on Rectangular Ring DGS." Applied Mechanics and Materials 273 (January 2013): 371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.273.371.

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Due to the frequency response periodicity of distributed transmission line, microstrip band-pass filter usually produces parasitic pass-band and outputs harmonics away from the center frequency of main pass-band. Based on the study of rectangular ring defected ground structure, a 5-order microstrip LPF(low-pass filter) was designed using the single-pole band-stop and slow-wave characteristics of the rectangular ring DGS(Defected Ground Structure) and SISS(Step-Impedance Shunt Stub) structure. Compared with traditional LPF, this LPF presents the advantages of compact size, low insertion loss, b

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Zhang, Z., M. Gerke, G. Vosselman, and M. Y. Yang. "FILTERING PHOTOGRAMMETRIC POINT CLOUDS USING STANDARD LIDAR FILTERS TOWARDS DTM GENERATION." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-2 (May 28, 2018): 319–26. http://dx.doi.org/10.5194/isprs-annals-iv-2-319-2018.

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Digital Terrain Models (DTMs) can be generated from point clouds acquired by laser scanning or photogrammetric dense matching. During the last two decades, much effort has been paid to developing robust filtering algorithms for the airborne laser scanning (ALS) data. With the point cloud quality from dense image matching (DIM) getting better and better, the research question that arises is whether those standard Lidar filters can be used to filter photogrammetric point clouds as well. Experiments are implemented to filter two dense matching point clouds with different noise levels. Results sho

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21

Torres, Sebastián M., and Dusan S. Zrnic. "Ground Clutter Canceling with a Regression Filter." Journal of Atmospheric and Oceanic Technology 16, no. 10 (1999): 1364–72. http://dx.doi.org/10.1175/1520-0426(1999)016<1364:gccwar>2.0.co;2.

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22

Xu, Qianxiang, Mingsheng Liao, Jiansi Yang, and Shoujing Yin. "Distance-limited filter for extracting ground points." Geo-spatial Information Science 12, no. 1 (2009): 46–49. http://dx.doi.org/10.1007/s11806-009-0172-6.

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23

Sakai, Yasunobu, Tetsuya Uno, Junichi Takagi, and Tsukasa Yamashita. "Optical Spatial Filter Sensor for Ground Speed." Optical Review 2, no. 1 (1995): 65–67. http://dx.doi.org/10.1007/s10043-995-0065-3.

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24

Efavi, Johnson Kwame, Abu Yaya, Solomon Adeborna, and Julius Fobil. "Development and Comparative Analysis of Aluminosilicate Based Ceramic Filters for Ground Water Defluoridation." Advanced Materials Research 936 (June 2014): 822–28. http://dx.doi.org/10.4028/www.scientific.net/amr.936.822.

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Low levels of fluoride in drinking water is healthy for the teeth enamel, however, higher concentrations result in dental fluorosis with prolonged exposures leading to skeletal fluorosis. Fluoride removal capacities of ceramic filters using aluminosilicates (Anfoega clay, Kibi kaolin, Laterite soil and Termitaria earth) samples from Ghana Geological Survey Department have been investigated and analysed for possible application in the Bongo District of Ghana noted forhavinghigh fluoride concentration in its ground water. Batch sorption studies conducted revealed that the amount of fluoride ions

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25

Et.al, Kavitha Devi CS. "A Compact Bandpass Microstrip Filter for Wireless Communication Applications." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 6 (2021): 161–65. http://dx.doi.org/10.17762/turcomat.v12i6.1281.

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A design of Compact Bandpass Microstrip Filter is proposed for wireless communication applications like Bluetooth, Wi-Fi, and 5G. Filter is constructed using parallel-coupled Microstrip lines to form 5th order filter of an inverted C structure. Ground slotted technique is used to enhance the bandwidth with dielectric constant of 9.9. The designed filter is simulated at a center frequency of 5.87GHz and bandwidth of 1.9GHz with an insertion loss of -0.5dB, return loss of greater than 12dB. The proposed filter has a compact size, good increased bandwidth and cost-effective. These results are ver

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26

Farida, Fitri, and Eko Setijadi. "Perancangan Filter Bandpass dengan Teknik Penggabungan Filter Lowpass dan Highpass." Jurnal Sustainable: Jurnal Hasil Penelitian dan Industri Terapan 7, no. 1 (2018): 32–38. http://dx.doi.org/10.31629/sustainable.v7i1.436.

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UWB technology started to become an attraction in the field of research since the Federal Communications Commission (FCC) allowing this communication is used for commercial communications at a frequency (3.1 GHz - 10.6 GHz). UWB has a very wide frequency range so that in practice there is often interference due to signal interference. Therefore in UWB system filter design is required to maintain UWB device. In telecommunications, filter is a transmission device that has the function to pass the desired frequency. In this paper designed bandpass filter which is applied for UWB technology. The d

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Fitria Nurjihan, Shita, and Achmad Munir. "Rancang Bangun Filter Bandpass Mikrostrip Pita Sangat Lebar Berbasis Defected Ground Structure (Design of Ultra Wideband Microstrip Bandpass Filter Based on Defected Ground Structure)." Jurnal Nasional Teknik Elektro dan Teknologi Informasi 9, no. 1 (2020): 104–9. http://dx.doi.org/10.22146/jnteti.v9i1.119.

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Along with the rapid development of technology, many techniques have been employed to improve filter performance by using microstrip, one of them is using a Defected Ground Structure (DGS) technique. The DGS is a technique implemented by combining various forms of slot on the groundplane of filter. This paper presents an ultra wideband (UWB) filter designed using DGS technique by combining two kind of slots on the groundplane, i.e., rectangular slot and rectangular ring slot. The design of composed filter is initialized using filter without DGS, then by adding two kinds of DGS on the groundpla

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Lafleche, P. T., J. P. Todoeschuck, O. G. Jensen, and A. S. Judge. "Analysis of ground-probing radar data: predictive deconvolution." Canadian Geotechnical Journal 28, no. 1 (1991): 134–39. http://dx.doi.org/10.1139/t91-014.

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Recent advances in ground-probing radar instrumentation have allowed the collection of large volumes of digital data. Such data sets are amenable to modern data-processing techniques both to increase geological resolution and to enhance data presentation. The close similarity between ground-radar data and seismic data suggests that processing techniques that have been used in the seismic industry could be applied to radar data. As an example, a ground probing radar profile is deconvolved using the common prediction-error filter, which assumes a white power spectrum for the reflections, and a f

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Hu, Xian Jun, Hang Yu Wang, and Zhang Song Shi. "Ground Target Tracking Using Aerial Images." Advanced Materials Research 734-737 (August 2013): 2964–69. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2964.

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The tracking of ground targets using aerial images was studied. A improved Kalman filter was derived for the tracking of ground targets. The novel feature of this improved filter were that the grey prediction equations and the road information have been incorporated to improve the accuracy of state estimates.The GM(1,1) (Grey Model) was introduced into Kalman prediction equations.The next value was forecasted by using few forward estimated values with a grey differential equation,which was baesd on the correction of mesurement covariance matrix. The tracking of the targets shows a satisfactory

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30

Hollings, P., M. J. Hendry, and R. Kerrich. "Sequential Filtration of Surface and Ground Waters from the Rabbit Lake Uranium Mine, Northern Saskatchewan, Canada." Water Quality Research Journal 34, no. 2 (1999): 221–48. http://dx.doi.org/10.2166/wqrj.1999.010.

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Abstract Major, trace and rare earth element analyses were conducted on water samples from four sites at the Cameco Rabbit Lake uranium mine in northern Saskatchewan, Canada. Samples were collected from the mill discharge, raise water, the tailings and an adjacent well. Water samples were sequentially filtered through 3.0-µm, 0.45-µm, 0.2-µm, 0.1-µm and 0.02-µm Millipore filters. Trace element and metal abundances were higher in unfiltered samples directly related to the tailings management facility (TMF) than the adjacent ground-water sample. The majority of the metals, including As and Ni, w

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Nurjihan, Shita Fitria, and Yenniwarti Rafsyam. "Ultra-Wideband Microstrip Bandpass Filter and Its Equivalent Circuit." IJITEE (International Journal of Information Technology and Electrical Engineering) 5, no. 2 (2021): 52. http://dx.doi.org/10.22146/ijitee.65695.

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Microstrip filters can be designed with various methods to obtain good performances, such as defected ground structure, open-ended slot, planar edge coupled, and split ring resonator with groundplane windowing. In this paper, the design of an ultra-wideband microstrip bandpass filter used the defected ground structure (DGS) method by adding a circular slot to the groundplane. The addition of the circular slot was carried out to improve the value of S parameter (return loss and insertion loss) from the initial filter design without a circular slot. In the simulation process, optimization was ca

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MacCarley, C. Arthur, and Erik L. Sandberg. "Traffic Ground Truth Estimation Using Multisensor Consensus Filter." Transportation Research Record: Journal of the Transportation Research Board 2308, no. 1 (2012): 128–37. http://dx.doi.org/10.3141/2308-14.

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Ho, Ka-Meng, Hoi-Kai Pang, and Kam-Weng Tam. "Dual-band bandpass filter using defected ground structure." Microwave and Optical Technology Letters 48, no. 11 (2006): 2259–61. http://dx.doi.org/10.1002/mop.21929.

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Mohan, Akhilesh, and Animesh Biswas. "Dual-band bandpass filter using defected ground structure." Microwave and Optical Technology Letters 51, no. 2 (2008): 475–79. http://dx.doi.org/10.1002/mop.24067.

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35

Kim, Jeong Phill, and Wee Sang Park. "Microstrip lowpass filter with multislots on ground plane." Electronics Letters 37, no. 25 (2001): 1525. http://dx.doi.org/10.1049/el:20011043.

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36

Liu, H. W., L. Shen, Y. Jiang, et al. "Triple-mode bandpass filter using defected ground waveguide." Electronics Letters 47, no. 6 (2011): 388. http://dx.doi.org/10.1049/el.2011.0006.

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37

Kufa, M., and Z. Raida. "Lowpass filter with reduced fractal defected ground structure." Electronics Letters 49, no. 3 (2013): 199–201. http://dx.doi.org/10.1049/el.2012.3473.

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38

Agrawal, R., K. Margandan, K. Singh, R. Acharya, S. Sharma, and K. Qanungo. "FABRICATION AND TESTING OF INTERMEDIATE LEVEL ACTIVATED ALUMINA BASED DEFLUORIDATION FILTERS." Periódico Tchê Química 10, no. 19 (2013): 65–80. http://dx.doi.org/10.52571/ptq.v10.n19.2013.65_periodico19_pgs_65_80.pdf.

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Two high capacity, high flow rate defluoridation filters with 10 and 25kg Activated Alumina have been fabricated and tested with local fluoride contaminated ground water. Various water quality parameters like pH, TDS, F-, Cl-, SO42-, NO3-, Ca2+ Hardness, Mg2+ Hardness, Total Hardness have been monitored throughout the filtration process and it has been found that these values are within the permissible limits. The filter performance has been evaluated by determining the volume of safe water (1.5 ppm), fluoride uptake capacity, flow rate, empty bed contact time, water capacity of filter, time b

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Kushwah, Vivek Singh. "CIRCULAR DEFECTED GROUND MICROSTRIP BAND-REJECT FILTER DESIGN FOR RADAR COMMUNICATION." International Journal of Engineering Technologies and Management Research 5, no. 2 (2020): 346–54. http://dx.doi.org/10.29121/ijetmr.v5.i2.2018.666.

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In this paper, a novel narrow band microstrip band-reject filter is designed using three circular shape defected ground structure (DGS). Three circular shape defected ground structure are linked by a path in the ground plane where etching process is applied. The path length of middle DGS cell is 8 mm and the path length of corner DGS cell is 11 mm whereas the path width of all three DGS cell is 0.6 mm and the radius of circular shape defected ground structure is 2.1 mm. The mid-stop band frequency of the designed filter is 1.61 GHz which is applicable for the satellite and radar communication

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Ural, Serkan, and Jie Shan. "A MIN-CUT BASED FILTER FOR AIRBORNE LIDAR DATA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B3 (June 9, 2016): 395–401. http://dx.doi.org/10.5194/isprsarchives-xli-b3-395-2016.

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LiDAR (Light Detection and Ranging) is a routinely employed technology as a 3-D data collection technique for topographic mapping. Conventional workflows for analyzing LiDAR data require the ground to be determined prior to extracting other features of interest. Filtering the terrain points is one of the fundamental processes to acquire higher-level information from unstructured LiDAR point data. There are many ground-filtering algorithms in literature, spanning several broad categories regarding their strategies. Most of the earlier algorithms examine only the local characteristics of the poi

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Ural, Serkan, and Jie Shan. "A MIN-CUT BASED FILTER FOR AIRBORNE LIDAR DATA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B3 (June 9, 2016): 395–401. http://dx.doi.org/10.5194/isprs-archives-xli-b3-395-2016.

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LiDAR (Light Detection and Ranging) is a routinely employed technology as a 3-D data collection technique for topographic mapping. Conventional workflows for analyzing LiDAR data require the ground to be determined prior to extracting other features of interest. Filtering the terrain points is one of the fundamental processes to acquire higher-level information from unstructured LiDAR point data. There are many ground-filtering algorithms in literature, spanning several broad categories regarding their strategies. Most of the earlier algorithms examine only the local characteristics of the poi

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De Almeida, T., F. Mesléard, M. Santonja, R. Gros, T. Dutoit, and O. Blight. "Above- and below-ground effects of an ecosystem engineer ant in Mediterranean dry grasslands." Proceedings of the Royal Society B: Biological Sciences 287, no. 1935 (2020): 20201840. http://dx.doi.org/10.1098/rspb.2020.1840.

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Within a local assemblage, ecosystem engineers can have major impacts on population dynamics, community composition and ecosystem functions by transforming or creating new habitats. They act as an ecological filter altering community composition through a set of environmental variables. The impact of ants on their environment has been widely studied, but their multi-component effects (both trophic and non-trophic) have been rarely addressed. We investigated the roles of Messor barbarus , one of the commonest harvester ant species in south-western European Mediterranean grasslands. We analysed

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Lee, Se-Hyeok, and Junho Song. "Regularization-Based Dual Adaptive Kalman Filter for Identification of Sudden Structural Damage Using Sparse Measurements." Applied Sciences 10, no. 3 (2020): 850. http://dx.doi.org/10.3390/app10030850.

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This paper proposes a dual adaptive Kalman filter to identify parameters of a dynamic system that may experience sudden damage by a dynamic excitation such as earthquake ground motion. While various filter techniques have been utilized to estimate system’s states, parameters, input (force), or their combinations, the filter proposed in this paper focuses on tracking parameters that may change suddenly using sparse measurements. First, an advanced state-space model of parameter estimation employing a regularization technique is developed to overcome the lack of information in sparse measurement

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Werthmüller, Dieter, Kerry Key, and Evert C. Slob. "A tool for designing digital filters for the Hankel and Fourier transforms in potential, diffusive, and wavefield modeling." GEOPHYSICS 84, no. 2 (2019): F47—F56. http://dx.doi.org/10.1190/geo2018-0069.1.

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The open-source code fdesign makes it possible to design digital linear filters for the Hankel and Fourier transforms used in potential, diffusive, and wavefield modeling. Digital filters can be derived for any electromagnetic (EM) method, such as methods in the diffusive limits (direct current, controlled-source EM [CSEM]) as well as methods using higher frequency content (ground-penetrating radar [GPR], acoustic and elastic wavefields). The direct matrix inversion method is used for the derivation of the filter values, and a brute-force minimization search is carried out over the defined spa

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Deighan, Andrew J., and Doyle R. Watts. "Ground‐roll suppression using the wavelet transform." GEOPHYSICS 62, no. 6 (1997): 1896–903. http://dx.doi.org/10.1190/1.1444290.

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Low‐frequency, high‐amplitude ground roll is an old problem in land‐based seismic field records. Current processing techniques aimed at ground‐roll suppression, such as frequency filtering, f-k filtering, and f-k filtering with time‐offset windowing, use the Fourier transform, a technique that assumes that the basic seismic signal is stationary. A new alternative to the Fourier transform is the wavelet transform, which decomposes a function using basis functions that, unlike the Fourier transform, have finite extent in both frequency and time. Application of a filter based on the wavelet trans

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Lee, Jong Ki, and Christopher Jekeli. "Improved Filter Strategies for Precise Geolocation of Unexploded Ordnance using IMU/GPS Integration." Journal of Navigation 62, no. 3 (2009): 365–82. http://dx.doi.org/10.1017/s0373463309005360.

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Efficient and precise geolocation can be achieved by integrating a ranging system, such as GPS, with inertial sensors in order to bridge short outages, enhance accuracy degradation, and increase the temporal resolution in the ranging system. Optimal integration depends on appropriate filter methods that can accommodate the particular short-term dynamics experienced by platforms, such as UXO ground-based detection systems. The traditional extended Kalman filter was designed to integrate data from a linearized system excited by Gaussian noise. We compared this filter to modern filters that obvia

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Xing, Zhi Wei, Hui Zhang, and Zhun Ren. "Adaptive Kalman Filter Based Aircraft Ground Icing Thickness Prediction." Advanced Materials Research 562-564 (August 2012): 1660–67. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1660.

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The nonlinear dynamics model is used to describe the change of aircraft icing thickness and icing deformation accelerations is viewed as dynamic noise in this paper. Then, a dynamic prediction model of aircraft icing thickness is established with the theory of adaptive kalman filter. And the adaptive kalman filter method based aircraft icing thickness prediction model is employed to forecast aircraft ground icing thickness and compared with support vector machine, BP neural network prediction method. The result of the instance simulation and analysis indicates that the adaptive kalman filter m

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Torres, Sebastián M., and David A. Warde. "Ground Clutter Mitigation for Weather Radars Using the Autocorrelation Spectral Density." Journal of Atmospheric and Oceanic Technology 31, no. 10 (2014): 2049–66. http://dx.doi.org/10.1175/jtech-d-13-00117.1.

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Abstract Radar returns from the ground, known as ground clutter, can contaminate weather signals, often resulting in severely biased meteorological estimates. If not removed, these contaminants may artificially inflate quantitative precipitation estimates and obscure polarimetric and Doppler signatures of weather. A ground-clutter filter is typically employed to mitigate this contamination and provide less biased meteorological-variable estimates. This paper introduces a novel adaptive filter based on the autocorrelation spectral density, which is capable of mitigating the adverse effects of g

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Berka, Mohammed, Zoubir Mahdjoub, and Mourad Hebali. "New design of dual-band bandpass microwave filter based on electromagnetic effect of metamaterial resonators." Journal of Electrical Engineering 69, no. 4 (2018): 311–16. http://dx.doi.org/10.2478/jee-2018-0044.

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Abstract Recent research on microwave filters show that there are constraints in their design; Effective solutions are needed for high-quality systems. In this manuscript, a new design of microwave dual-band bandpass filter is presented. The complementary metamaterial resonators with magnetic activity and negative permeability (µ < 0) are engraved on the lower ground plane and coplanar guides are maintained in the upper plane of the filter. Both (CSRRs) used have different shapes and dimensions from one another to have a dual band-pass behavior of our filter outside the range 5 to 6 GHz to

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Deng, Zhong Liang, Chang Shu, and Nai Bo Zhang. "Design of a Dual Stop-Band Filter Based on Coplanar Waveguide." Applied Mechanics and Materials 151 (January 2012): 145–49. http://dx.doi.org/10.4028/www.scientific.net/amm.151.145.

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This letter presents a dual stop-band filer based on coplanar waveguide (CPW), which consists of two spiral-shaped defected ground structure (DGS). The model of the equivalent circuit, discussing the influence of the spiral shape size, and simulated performances are presented. Finally, a dual stop-band filter is presented and verified by simulations, which is operated from 11.5 to 14 GHz and 23 to 28 GHz.

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