Results 61 to 70 of about 1,166 (180)
Environmental DNA, Volume 6, Issue 3, May–June 2024.Ordination of the 14 sampling sites (numbers) using a non‐metric multidimensional scaling (NMDS) based on the Bray‐Curtis dissimilarities of the 13 microhabitats. This means the 14 sites are placed in respect to their similarity in microhabitats of which the six most abundant across sites are displayed in orange.
O. B. Brodnicke +10 more
wiley +1 more source
High‐Latitude Off‐Great Circle Propagation Associated With the Solar Terminator
Radio Science, Volume 59, Issue 5, May 2024.Abstract Large‐scale ionospheric gradients associated with the solar terminator can deflect high frequency (HF) radio waves to off‐great circle paths during the morning and evening, negatively impacting technologies reliant on HF radio wave propagation.
T. G. Cameron +4 more
wiley +1 more source
Statistical Analysis of Off‐Great Circle Radio Wave Propagation in the Polar Cap
Radio Science, Volume 59, Issue 4, April 2024.Abstract High latitude ionospheric density structures such as polar cap patches and arcs are capable of deflecting high frequency (HF) radio waves to off‐great circle paths, and are likely detrimental to technologies dependent on HF radio propagation.
T. G. Cameron +4 more
wiley +1 more source
Impacts of Forecast Time and Verification Area Setting on the Targeted Observation of Typhoon
AtmosphereThe results of the identification of sensitive areas are affected by the forecast time and verification area settings in targeted observations. Understanding this setting issue is important for improving the effectiveness of the identification of ...
Jiaqi Kang +3 more
doaj +1 more source
Simultaneous operation of two over-the-horizon radars [PDF]
, 2004 —By exploiting the reflective and refractive nature of high-frequency (HF) radiowave propagation through the iono-sphere or the conducting sea surface, over-the-horizon radar (OTHR) systems perform wide-area surveillance at long range well beyond the ...
Yimin Zhang +3 more
core +1 more source
Detection of Slow Radial Velocity Ship by OTHR
Procedia Computer Science, 2018 Abstract In order to detect ship in the spread sea clutter caused by ionospheric disturbance, algorithms of short coherent integration time (CIT) are used in over-the-horizon radar system. Here, ECVC (Estimate Clutter Via Correlation) algorithm is employed to provide higher resolution to detect ship of slow radial velocity.
Huan Luo, Hui Xiao, Jun Yuan, Hongtu Xie
openaire +1 more source
OTHR Multipath Tracking with Uncertain Co-ordinate Registration
, 1998 Multipath probabilistic data association (MPDA) exploits discrete multipath propagation improve tracking performance in systems suchas over-the-horizon radar.
G. W. Pulford
core
Crucial contributors? Re-examining labour market impact and workplace-training intensity in Canadian trades apprenticeship [PDF]
Canadian apprenticeship policy has recently turned to direct subsidies for participants, including a federal tax incentive for employers. Some assumptions underlying the employer subsidy are: that apprenticeship training is a principal contributor to the
Meredith, John
core
Prevalence of Positive Montoux Test in the Province of Sindh
Liaquat Medical Research Journal, 2020 Tuberculosis is a global health emergency. WHO has predicted Pakistan to be at 8th position out of the 22 countries having highest burden of Tuberculosis in the world. At present this disease has a prevalence of >1% in our country.
Abid Chang
doaj
Transient interference excision and spectrum reconstruction for OTHR
Electronics Letters, 2012 High-frequency sky wave over-the-horizon radar (OTHR) suffers performance degradation from transient interference. The segmental subspace projection approach is applied to suppress the clutter and locate the transient interference. After interference excision by adaptive thresholding, the integrated Doppler spectrum is reconstructed based on compressed
Y.H. Quan, M.D. Xing, L. Zhang, Z. Bao
openaire +1 more source