HF radio
Research on HF Radio Reflections on the Sea Level Based on Mixed Model
... We constructed a model of HF radio propagation from the point sources on land to the different sea levels and the first reflection intensity. It satisfies the actual needs of signal reflection in real life. ...
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Simulations of Ionospheric Behavior Driven by HF Radio Waves at the Initial Stage
... between HF waves and the plasma in a natural way ...the radio waves propagation in plasma have been reported [36, ...by HF radio waves at the millisecond time scale according to plasma ...
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Ionospheric electron heating, optical emissions, and striations induced by powerful HF radio waves at high latitudes: Aspect angle dependence
... powerful HF-radio wave injection have been observed during nighttime using the EISCAT incoherent scatter radar near Tromsø in northern ...the HF-pump beam was scanned between the same three ...
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Analysis and simulation of standing wave pattern of powerful HF radio waves in ionospheric reflection region
... In this paper, we are interested in analyzing the vari- ation of the E → intensity near the reflection point caused by the initial vertical propagation of the HF radio waves in the ionosphere. We therefore ...
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Excitation of Plasma Irregularities in the F Region of the Ionosphere by Powerful HF Radio Waves of X‐Polarization
... (HF) radio waves of O-polarization have been investigated both experimentally and theoretically for more than 40 ...powerful HF radio waves with ionospheric ...the HF radio wave ...
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The FALCON Series: Long-range communications from the leader in HF radio
... Frequency Hopping protects your tactical communications from eavesdropping, jamming and radio direction-finding techniques by randomly changing the communication frequencies 20 times per second. Designed to ...
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A Mathematical Model of Multi Hop HF Radio Propagation
... This model has a certain scope of application, so the decay needs to be cor- rected when the Medium attenuation, the introduction of correction factor. On the other hands, this model investigates radio waves as ...
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Radio Propagation Prediction for HF Communications
... reasons, HF propagation is basically split into skywave, groundwave and near vertical incidence ...range HF radio ...skywave radio propagation and provides the basis for almost all HF ...
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Study on the ionogram variation at different solar activity and earthquake occurrence
... The D layer is the lowest part of the ionospheric layer, which lies from about 50 to 90 km of altitude above the surface of the Earth. It develops shortly after sunrise and disappears shortly after sunset. Ionization ...
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The Feasibility of ATM operations over high frequency radio and the viability of the ATM/HF architecture
... Acronyms AAL ATM Adaptation Layer - Available Bit Rate ABR ALE Automatic Link Establishment - Asynchronous Transfer Mode ATM ATM/HF BER CBR over HF Radio Constant Bit Rate - CLR Cell Los[r] ...
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Challenges for Wireless Mesh Networks to provide reliable carrier-grade services
... a radio access network supporting fixed and mobile users – also for temporary operation (city/emergency ...different radio technologies a link layer (Layer 2, L2) interface abstraction is specified and ...
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How effective is an in-hospital heart failure self-care program in a Japanese setting? Lessons from a randomized controlled pilot study
... group. HF knowledge in the intervention group tended to improve more over 6 months than in the control group (a group-by-time effect, ...the HF program was related to better outcomes regarding HF ...
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Multi criteria group decision making for pipe material selection: comparative analysis of HF Vikor and HF Electre II
... But problem of failures are not omitted completely. In sugar industry many pipe lines are damaged due to acidic nature of sugarcane juice. Keeping in view of the evidence the decision making drives to increase the ...
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Dietary composition modulates brain mass and solubilizable Aβ levels in a mouse model of aggressive Alzheimer's amyloid pathology
... between intake of specific types of fat and AD in a cohort of 815 65-year-old patients, intake of saturated fat and trans-unsaturated fat was correlated with an increased risk for clinical AD, while high intake of ...
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Fabrication and Modification of Thin-Film Composite Hollow Fiber NF Membranes
... low module cost. However, they are extremely susceptible to the floating matter, have high energy losses caused by friction in the spacers and it is not possible to be reverse flushed [32]. Tubular modules do not require ...
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Simultaneous transcutaneous electrical nerve stimulation mitigates simulator sickness symptoms in healthy adults: a crossover study
... Abbreviations CP: Concentration performance; E%: Percentage of errors; HR: Heart rate; HRV: Heart rate variability; HF: High-frequency power component; HF/LF + HF: Ratio of high-frequenc[r] ...
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Performance of Porous Carbon as Catalyst Support for Anode from Rice Husk in a Direct Methanol Fuel Cell
... TEM images prove the PtRu nanoparticles (dark dots) are uniformly dispersed on carbon support (gray particles). The elongated and connected catalyst particles in the PtRu/RH-HF catalysts (Fig. 5(a)) are observed. ...
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Non-invasive intraventricular pressure differences estimated with cardiac MRI in subjects without heart failure and with heart failure with reduced and preserved ejection fraction
... ► Our study demonstrated the feasibility to as- sess IVPDs throughout the cardiac cycle using phase-contrast MRI and comparing IVPDs between subjects without HF and subjects with HFrEF and HFpEF. The proposed ...
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A compact portable HF terminal
... The system incorporates novel digital signal processing DSP algorithms for modulationldemodulation [4], frequency-offset correction [4], error control [5][6], synchronisation m[8], real-[r] ...
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Formation of Ni Aluminide Containing Hf by Simultaneous Electrodeposition of Al and Hf and Cyclic Oxidation Resistance
... of Hf electro- depositon due to the reduction of Hf ion were competing reactions, the reaction rate of the Hf electrodeposition inceased due to the decease in the reaction rate of the Al ...the ...
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