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Journal articles on the topic 'RF Sources'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Briefi, S., D. Zielke, and U. Fantz. "RF power transfer efficiency of H ion sources: fluid modeling of accelerator source geometries." Journal of Physics: Conference Series 2244, no. 1 (2022): 012032. http://dx.doi.org/10.1088/1742-6596/2244/1/012032.

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Abstract The plasma in RF driven negative hydrogen ion sources is sustained via inductive coupling with large power levels of up to 100 kW and low frequencies around 1 MHz. This leads to currents of around 100 A flowing over the RF coil and corresponding voltages in the kV range. The associated risk of arcing limits the reliability of the whole ion source. The required power level can be reduced via optimizing the RF power transfer efficiency η, which is typically only in the range of 50 to 60% for H- sources used for neutral beam injection systems. In order to study the optimization of η syst

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2

Fowler, Ashley M., Faith A. Ochwada-Doyle, Natalie A. Dowling, et al. "Integrating recreational fishing into harvest strategies: linking data with objectives." ICES Journal of Marine Science 79, no. 2 (2022): 285–307. http://dx.doi.org/10.1093/icesjms/fsab270.

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Abstract Recreational fishing (RF) is a popular pastime resulting in substantial fish mortality in many regions. Yet inclusion of RF in fishery harvest strategies is limited, because the sector's objectives are poorly understood, as are the data required to track their performance. To address this, we reviewed RF data sources available from a region of globally high participation (New South Wales [NSW], Australia) and evaluated their utility for RF-specific performance indicators within harvest strategies. We then linked these data sources to RF objectives they may be used to monitor. A total

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3

Kochev, V. A., and P. A. Romashov. "THE CONTRACTUAL SOURCES OF CONSTITUTIONAL LAW RF." Ex jure, no. 3 (2018): 19–33. http://dx.doi.org/10.17072/2619-0648-2018-3-19-33.

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the article gives the concept of contractual sources of law, a broad approach to understanding the contractual sources of constitutional law is given, their basic forms are defined, classification by types (international, domestic and regional) is carried out. An author's approach is proposed to address the issue of the correlation between the Constitution of federal legislation, on the one side, and international legal acts, including the decision of the European Court of Human Rights, on the other side.

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Tezcan, Filiz, and F. Erim. "Determination of Vitamin B2 Content in Black, Green, Sage, and Rosemary Tea Infusions by Capillary Electrophoresis with Laser-Induced Fluorescence Detection." Beverages 4, no. 4 (2018): 86. http://dx.doi.org/10.3390/beverages4040086.

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Vitamin B2, also known as riboflavin (RF) is an essential micronutrient for human health and must be obtained from dietary sources. Plants biosynthesize riboflavin and are important dietary sources of vitamin B2 for humans. Our present study reports sensitive detection of vitamin B2 in widely consumed tea infusions, namely black, green, sage and rosemary tea infusions, by a capillary electrophoresis method combined with laser induced fluorescence detection. Moreover, the correlation between the vitamin B2 content of tea plants with their total phenolics (TPs) and antioxidant capacity are evalu

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Shashikant V. Golande. "Enhancement Of Rectenna Arrays to Gather Radiofrequency Energy from Various Sources." Journal of Information Systems Engineering and Management 10, no. 22s (2025): 618–24. https://doi.org/10.52783/jisem.v10i22s.3609.

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In this work, we examine a wireless communication pair that uses radio frequency (RF) signals. The transmitter generates energy from an energy access point first, and then sends data to the recipient. Wireless sensor networks (WSNs) have garnered a lot of attention recently because to its numerous applications in a wide range of industries, including smart cities, industrial automation, healthcare, and environmental monitoring. This paper provides a detailed examination of the designs, principles, and performance evaluation of several RF energy harvesting systems in connection to RF energy har

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6

Ives, R. L., M. Read, T. Bui, et al. "High efficiency, low cost, RF sources for accelerators and colliders." Journal of Instrumentation 18, no. 05 (2023): T05003. http://dx.doi.org/10.1088/1748-0221/18/05/t05003.

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Abstract Accelerators for High Energy Physics (HEP) are large users of energy, much of it in the form of radiofrequency (RF) power to accelerate particles to very high energies. Proposed HEP projects will require even larger amounts of RF energy. Increasing concerns of the cost and availability of energy will require the HEP community to use energy as efficeintly as possible. Successful transfer of HEP technology to the public and private sectors will be most effective if it is highly efficient. Historically, the HEP community has utilized available RF power sources, mainly in the form of vacu

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7

Dahlmann, K., V. Grewe, M. Ponater, and S. Matthes. "Attribution of ozone radiative forcing trend to individual NO<sub>x</sub> sources." Atmospheric Chemistry and Physics Discussions 9, no. 4 (2009): 16131–62. http://dx.doi.org/10.5194/acpd-9-16131-2009.

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Abstract. Decadal means of ozone fields from transient E39/C climate-chemistry simulations (1960–2019) are analysed and temporally developing ozone radiative forcings (RF) are investigated which result from individual ozone precursor sources like road traffic, industry, air traffic, etc. We study how effective NOx emissions from different sources produce ozone. This ozone production efficiency is mainly dependent on the altitude of NOx emission and on the amount of background NOx. For example, our study shows that the ozone production efficiency of lightning and air traffic have a five and two

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8

OLIVER, J., N. PIERSE, and M. G. BAKER. "Estimating rheumatic fever incidence in New Zealand using multiple data sources." Epidemiology and Infection 143, no. 1 (2014): 167–77. http://dx.doi.org/10.1017/s0950268814000296.

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SUMMARYRheumatic fever (RF) is an important public health problem in New Zealand (NZ). There are three sources of RF surveillance data, all with major limitations that prevent NZ generating accurate epidemiological information. We aimed to estimate the likely RF incidence using multiple surveillance data sources. National RF hospitalization and notification data were obtained, covering the periods 1988–2011 and 1997–2011, respectively. Data were also obtained from four regional registers: Wellington, Waikato, Hawke's Bay and Rotorua. Coded patient identifiers were used to calculate the proport

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9

Chiaramello, Emma, Marta Bonato, Serena Fiocchi, et al. "Radio Frequency Electromagnetic Fields Exposure Assessment in Indoor Environments: A Review." International Journal of Environmental Research and Public Health 16, no. 6 (2019): 955. http://dx.doi.org/10.3390/ijerph16060955.

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Exposure to radiofrequency (RF) electromagnetic fields (EMFs) in indoor environments depends on both outdoor sources such as radio, television and mobile phone antennas and indoor sources, such as mobile phones and wireless communications applications. Establishing the levels of exposure could be challenging due to differences in the approaches used in different studies. The goal of this study is to present an overview of the last ten years research efforts about RF EMF exposure in indoor environments, considering different RF-EMF sources found to cause exposure in indoor environments, differe

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10

DANNEVILLE, F., B. TAMEN, A. CAPPY, J.-B. JURAVER, O. LLOPIS, and J. GRAFFEUIL. "LOW FREQUENCY NOISE CONVERSION IN FETS UNDER NONLINEAR OPERATION." Fluctuation and Noise Letters 01, no. 03 (2001): L189—L195. http://dx.doi.org/10.1142/s021947750100041x.

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The conversion mechanisms of microscopic low frequency noise sources (e.g. generation-recombination noise sources) located in the channel of a FET (Field Effect Transistor), in the presence of a large RF signal, are investigated. It is shown that the base-band (low frequency) input gate noise voltage spectral density is strongly dependent on the magnitude of the input RF power applied to the FET. Moreover, the microscopic generation-recombination noise sources distributed along the channel are also responsible of up-converted input gate noise voltage spectral density around the RF frequency.

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11

Zielke, D., S. Briefi, S. Lishev, and U. Fantz. "Modeling inductive radio frequency coupling in powerful negative hydrogen ion sources: validating a self-consistent fluid model." Plasma Sources Science and Technology 31, no. 3 (2022): 035019. http://dx.doi.org/10.1088/1361-6595/ac5845.

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Abstract Radio frequency (RF) negative hydrogen ion sources utilized in fusion and for accelerators use inductively coupled plasmas, which are operated at a low driving frequency, high power densities and gas pressures in the order of 1 MHz, 10 W cm−3 and 1 Pa, respectively. In this work a numerical fluid model is developed for a self-consistent description of the RF power coupling in these discharges. After validating the RF power coupling mechanism, such a model is a valuable tool for the optimization of RF power coupling and hence can help to increase the efficiency and reliability of RF io

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12

Hwang, Jong-Jin, Hyo-Jun Sim, and Seung-Jae Moon. "Development and Evaluation of Ferrite Core Inductively Coupled Plasma Radio Frequency Ion Source for High-Current Ion Implanters in Semiconductor Applications." Sensors 24, no. 15 (2024): 5071. http://dx.doi.org/10.3390/s24155071.

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This study presents the development of a ferrite core inductively coupled plasma (ICP) radio frequency (RF) ion source designed to improve the lifetime of ion sources in commercial ion implanters. Unlike existing DC methods, this novel approach aims to enhance the performance and lifetime of the ion source. We constructed a high-vacuum evaluation chamber to thoroughly examine RF ion source characteristics using a Langmuir probe. Comparative experiments assessed the extraction current of two upgraded ferrite core RF ion sources in a commercial ion implanter setting. Additionally, we tested the

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13

Damilare Samson Olaleye, Abiodun Charles Oloye., Akinkunle Olanrewaju Akinloye, and Oladayo Tosin Akinwande. "Advancing Green Communications: The Role of Radio Frequency Engineering in Sustainable Infrastructure Design." International Journal of Latest Technology in Engineering Management & Applied Science 13, no. 5 (2024): 113–21. http://dx.doi.org/10.51583/ijltemas.2024.130511.

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A thorough examination of the role of radio frequency (RF) engineering is crucial for promoting sustainability in communications infrastructure. This review explores the complex interplay between environmental concerns in communication systems and RF engineering. It examines RF engineering approaches and strategies that support the design, implementation, and preservation of environmentally friendly infrastructure, including the integration of renewable energy sources into RF systems, and the prospects and challenges associated with employing RF technologies for fostering sustainable actions i

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14

Mascali, David, Giuseppe Torrisi, Alessio Galatà, et al. "Modelling RF-plasma interaction in ECR ion sources." EPJ Web of Conferences 157 (2017): 03054. http://dx.doi.org/10.1051/epjconf/201715703054.

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15

Deatanyah, P., E. K. K. Abavare, A. Menyeh, and J. K. Amoako. "PUBLIC EXPOSURE TO MULTIPLE RF SOURCES IN GHANA." Radiation Protection Dosimetry 181, no. 4 (2018): 403–11. http://dx.doi.org/10.1093/rpd/ncy042.

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16

Ives, R. Lawrence, Christopher J. Oldham, James S. Daubert, et al. "Corrosion Mitigation Coatings for RF Sources and Components." IEEE Transactions on Electron Devices 65, no. 6 (2018): 2385–92. http://dx.doi.org/10.1109/ted.2017.2788379.

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17

Vozny, V. I., V. I. Miroshnichenko, S. M. Mordyk, et al. "High-brightness RF Ion Sources for Accelerator Applications." Nauka ta innovacii 6, no. 5 (2010): 38–44. http://dx.doi.org/10.15407/scin6.05.038.

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18

Perkins, L. T., G. J. De Vries, P. R. Herz, et al. "Performance characterization of rf‐driven multicusp ion sources." Review of Scientific Instruments 67, no. 3 (1996): 1057–59. http://dx.doi.org/10.1063/1.1146757.

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19

Cavenago, M., T. Kulevoy, and S. Petrenko. "Experiments with rf ovens in ECR ion sources." Review of Scientific Instruments 75, no. 11 (2004): 4934–43. http://dx.doi.org/10.1063/1.1808914.

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20

Kawamura, E., M. A. Lieberman, A. J. Lichtenberg, and E. A. Hudson. "Capacitive discharges driven by combined dc/rf sources." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 25, no. 5 (2007): 1456. http://dx.doi.org/10.1116/1.2771561.

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21

Cavenago, M., T. Kulevoy, and S. Petrenko. "Operation of rf ovens in ECR ion sources." Review of Scientific Instruments 75, no. 5 (2004): 1446–48. http://dx.doi.org/10.1063/1.1690483.

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22

Vavilin, K. V., A. A. Rukhadze, Kh M. Ri, and V. Yu Plaksin. "Low-Power RF plasma sources for technological applications: III. helicon plasma sources." Technical Physics 49, no. 6 (2004): 691–97. http://dx.doi.org/10.1134/1.1767876.

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23

Wahyuni, S., Z. Susanti, R. Arief, M. L. Widiastuti, and P. N. Susilawati. "Comparative seed yields of lowland rice (Oryza sativa L.): evaluating seeds sources and fertilizers." IOP Conference Series: Earth and Environmental Science 1377, no. 1 (2024): 012014. http://dx.doi.org/10.1088/1755-1315/1377/1/012014.

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Abstract The use of high-quality seeds from high-yielding rice varieties (HYV) is crucial for enhancing grain yield. Yet, the supply of certified seed meets only 57.3% of the total rice seed demand, leading some farmers to plant non-certified local rice seeds. A study examining the effects of seed sources and fertilization on seed yields was conducted in Bogor Village, Sukra District, Indramayu Regency during the Dry Season of 2019. The treatments consisted of two factors: A. Seed sources (Local non-certified seed (Local-NC), HYV non-certified seed (HYV-NC), and HYV-certified seed) and B. Fert

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24

Parigi, Silvia. "The Scientific Background of Berkeley’s Theory of Vision: Some Overlooked Berkeleian Sources." Ruch Filozoficzny 75, no. 4 (2020): 7. http://dx.doi.org/10.12775/rf.2019.056.

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25

Ding, Jupeng, Chih-Lin I, Kai Zhao, and Shuxian Liu. "Exploring the Effect of Optical Beams on Hybrid VLC/RF Transmission Characteristics." Photonics 10, no. 2 (2023): 185. http://dx.doi.org/10.3390/photonics10020185.

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The hybrid visible light communication/radio frequency (VLC/RF) transmission system could offer consistent coverage and high throughput, which are inherited from the VLC and RF link components separately. However, almost all current hybrid VLC/RF schemes are limited in scenarios adopting light emitting diodes (LED) sources with basic Lambertian optical beams, and fail to investigate the scenarios using sources with distinct non-Lambertian optical beams. For exploring this effect of optical beams on hybrid VLC/RF transmission performance, typical symmetric and non-symmetric optical beams are in

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26

Ward, D. S., and N. M. Mahowald. "Local sources of global climate forcing from different categories of land use activities." Earth System Dynamics Discussions 5, no. 2 (2014): 1751–92. http://dx.doi.org/10.5194/esdd-5-1751-2014.

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Abstract. Identifying and quantifying the sources of climate impacts from land use and land cover change (LULCC) is necessary to optimize policies regarding LULCC for climate change mitigation. These climate impacts are typically defined relative to emissions of CO2, or sometimes emissions of other long-lived greenhouse gases. Here we use previously published estimates of the radiative forcing (RF) of LULCC that include the short-lived forcing agents O3 and aerosols, in addition to long-lived greenhouse gases and land albedo change, for six projections of LULCC as a metric for quantifying clim

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27

Ward, D. S., and N. M. Mahowald. "Local sources of global climate forcing from different categories of land use activities." Earth System Dynamics 6, no. 1 (2015): 175–94. http://dx.doi.org/10.5194/esd-6-175-2015.

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Abstract. Identifying and quantifying the sources of climate impacts from land use and land cover change (LULCC) is necessary to optimize policies regarding LULCC for climate change mitigation. These climate impacts are typically defined relative to emissions of CO2, or sometimes emissions of other long-lived greenhouse gases. Here we use previously published estimates of the radiative forcing (RF) of LULCC that include the short-lived forcing agents O3 and aerosols, in addition to long-lived greenhouse gases and land albedo change, for six projections of LULCC as a metric for quantifying clim

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28

Nakul, Thanatith, and Kazunori Takahashi. "Characterization of a 2 MHz-radiofrequency-driven magnetically expanding plasma source." AIP Advances 12, no. 9 (2022): 095118. http://dx.doi.org/10.1063/5.0106732.

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A radio frequency (rf) plasma source is operated at 2 MHz under an expanding magnetic field. The source consists of a 14-cm-diameter and 25-cm-long source tube wound by a seven-turn rf loop antenna powered via an impedance matching circuit. The efficient rf power transfer to the plasma is demonstrated, and the high-density plasma above 1012 cm−3 is successfully obtained for a kW level of the rf power. The radial density profile having a center peak is observed both in the source and in the expanding magnetic field; it does not show the conical density structure previously observed in 13.56 MHz

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29

Leung, Ka-Ngo. "rf-driven ion sources for industrial applications (invited) (abstract)." Review of Scientific Instruments 79, no. 2 (2008): 02B319. http://dx.doi.org/10.1063/1.2838065.

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30

Peters, J. "New developments in rf-driven multicusp H− ion sources." Review of Scientific Instruments 77, no. 3 (2006): 03A528. http://dx.doi.org/10.1063/1.2170035.

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31

Abedini-Livari, Ali, Keyvan Firuzi, and Mehdi Vakilian. "Distinguishing polymeric insulators PD sources through RF PD measurement." IET Generation, Transmission & Distribution 14, no. 21 (2020): 4859–65. http://dx.doi.org/10.1049/iet-gtd.2020.0099.

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32

Veitzer, Seth A., Madhusudhan Kundrapu, Peter H. Stoltz, and Kristian R. C. Beckwith. "Alternative modeling methods for plasma-based Rf ion sources." Review of Scientific Instruments 87, no. 2 (2016): 02B142. http://dx.doi.org/10.1063/1.4936090.

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33

Belostotski, Leonid. "A Calibration Method for RF and Microwave Noise Sources." IEEE Transactions on Microwave Theory and Techniques 59, no. 1 (2011): 178–87. http://dx.doi.org/10.1109/tmtt.2010.2086066.

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34

Yu, Tsung-Chi, Meng-Shu Yeh, Chaoen Wang, et al. "Combining high-power heterogeneous RF sources for accelerator applications." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 978 (October 2020): 164445. http://dx.doi.org/10.1016/j.nima.2020.164445.

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35

DiPeso, G., T. D. Rognlien, V. Vahedi, and D. W. Hewett. "Equilibrium profiles for RF-plasma sources with ponderomotive forces." IEEE Transactions on Plasma Science 23, no. 4 (1995): 550–57. http://dx.doi.org/10.1109/27.467974.

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36

Klepper, C. C., P. Jacquet, V. Bobkov, et al. "RF sheath-enhanced beryllium sources at JET’s ICRH antennas." Journal of Nuclear Materials 438 (July 2013): S594—S598. http://dx.doi.org/10.1016/j.jnucmat.2013.01.124.

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37

Burrill, A., I. Ben-Zvi, R. Calaga, et al. "BNL superconducting RF guns–technology challenges as ERL sources." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 557, no. 1 (2006): 75–79. http://dx.doi.org/10.1016/j.nima.2005.10.054.

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38

Abgaryan, V. K., and K. I. Kruglov. "Thermal model of RF ion thrusters and ion sources." Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques 9, no. 6 (2015): 1137–43. http://dx.doi.org/10.1134/s1027451015060038.

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Vavilin, K. V., A. A. Rukhadze, M. Kh Ri, and V. Yu Plaksin. "Low-power inductive RF plasma sources for technological applications." Plasma Physics Reports 30, no. 8 (2004): 687–97. http://dx.doi.org/10.1134/1.1788762.

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40

Pickard, D. S., K. N. Leung, L. T. Perkins, D. M. Ponce, and A. T. Young. "Photoemission starting of induction rf‐driven multicusp ion sources." Review of Scientific Instruments 67, no. 2 (1996): 428–30. http://dx.doi.org/10.1063/1.1146608.

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41

Seryakov, Yu N., and R. I. Shabanov. "Measurement of system parameters using calibrated rf-noise sources." Measurement Techniques 29, no. 5 (1986): 466–68. http://dx.doi.org/10.1007/bf00865961.

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42

McLain, J., R. H. Scott, and R. C. Vondrasek. "RF Frequency Combining for the ATLAS ECR Ion Sources." Journal of Physics: Conference Series 2743, no. 1 (2024): 012045. http://dx.doi.org/10.1088/1742-6596/2743/1/012045.

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Abstract The ECR2 and ECR3 ion sources at the Argonne Tandem Linac Accelerator System (ATLAS) operate with two microwave frequencies, improving their performance over single frequency operation. A typical method for transmitting both microwave frequencies is by having two separate frequency generators with their own corresponding amplifiers. These amplifiers transmit their microwaves into the ion source using separate waveguides. Another method that is investigated is to combine the low power microwave frequencies with a splitter/combiner and input the combined signals into the high-power ampl

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George, A., S. Melanson, M. Dehnel, and C. Hoehr. "Investigation of plasma chamber erosion in an RF ion source." Journal of Physics: Conference Series 2743, no. 1 (2024): 012006. http://dx.doi.org/10.1088/1742-6596/2743/1/012006.

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Abstract Filament driven plasma sources are widely used to produce ion beams, but they require frequent maintenance due to the limited filament lifetime. External radio-frequency (RF) coupled ion source offers a filament-free plasma and hence better maintenance. However, one of the issues encountered during the development of a planar external RF-powered ion source at D-Pace was the erosion of its copper plasma chamber and subsequent formation of copper deposits on the Aluminum Nitride (AlN) RF window. The copper deposits on the RF window deteriorate the power coupling between the external ant

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44

Chmut, G. A. "Additional sources of financing for the updated national development goals." Vestnik Universiteta, no. 11 (December 30, 2024): 20–26. https://doi.org/10.26425/1816-4277-2024-11-20-26.

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National development goals are the basis of public policy and combine labour and material resources to address key development issues. They are approved by the decree of the President of the Russian Federation (hereinafter referred to as RF, Russia). For the first time, the RF’s national development goals were described in the Presidential Decree No. 204 and included a development perspective until 2024. In 2020, due to the challenges associated with the spread of COVID-19, the Decree of the President of the RF No. 474 clarified the list of national goals and extended their implementation peri

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Zielke, D., S. Briefi, S. Lishev, and U. Fantz. "Predictive fluid model for self-consistent description of inductive RF coupling in powerful negative hydrogen ion sources." Journal of Physics: Conference Series 2244, no. 1 (2022): 012030. http://dx.doi.org/10.1088/1742-6596/2244/1/012030.

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Abstract RF-driven negative hydrogen ion sources are typically operated at low frequencies around 1 MHz, gas pressures around or below 1 Pa and large power densities up to 10 Wcm-3. Owing to these conditions as well as the current discharge geometries and antenna layouts, the RF power coupling is far from optimized, i.e. only a fraction η of the power delivered by the generator is absorbed by the plasma. This considerably limits the performance and reliability of RF-driven ion sources. To study the bidirectional RF power coupling a self-consistent fluid model is introduced. Taking into account

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46

Zielke, D., S. Briefi, S. Lishev, and U. Fantz. "Predictive fluid model for self-consistent description of inductive RF coupling in powerful negative hydrogen ion sources." Journal of Physics: Conference Series 2244, no. 1 (2022): 012030. http://dx.doi.org/10.1088/1742-6596/2244/1/012030.

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Abstract RF-driven negative hydrogen ion sources are typically operated at low frequencies around 1 MHz, gas pressures around or below 1 Pa and large power densities up to 10 Wcm-3. Owing to these conditions as well as the current discharge geometries and antenna layouts, the RF power coupling is far from optimized, i.e. only a fraction η of the power delivered by the generator is absorbed by the plasma. This considerably limits the performance and reliability of RF-driven ion sources. To study the bidirectional RF power coupling a self-consistent fluid model is introduced. Taking into account

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47

Suraweera, S. A. T. U. W. K., and K. P. S. C. Jayaratne. "RF-EMR pollution levels near kindergartens due to mobile communication towers and Wi-Fi sources." Sri Lankan Journal of Physics 24, no. 1 (2023): 1–17. http://dx.doi.org/10.4038/sljp.v24i1.8117.

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Wireless communications play a crucial role in human lives. The introduction of cellular network systems, broadband internet services and public Wi-Fi services increase the connectivity between people exponentially. These wireless networks require antenna structures to propagate carrier waves through space and these waves are located within the Radiofrequency (RF) region in the electromagnetic spectrum. The effects of these RF waves on people, especially children, and pregnant women cannot be neglected. According to the researchers, there are some adverse health issues related to thermal and n

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48

Luo, Yu, Lina Pu, Guodong Wang, and Yanxiao Zhao. "RF Energy Harvesting Wireless Communications: RF Environment, Device Hardware and Practical Issues." Sensors 19, no. 13 (2019): 3010. http://dx.doi.org/10.3390/s19133010.

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Radio frequency (RF) based wireless power transfer provides an attractive solution to extend the lifetime of power-constrained wireless sensor networks. Through harvesting RF energy from surrounding environments or dedicated energy sources, low-power wireless devices can be self-sustaining and environment-friendly. These features make the RF energy harvesting wireless communication (RF-EHWC) technique attractive to a wide range of applications. The objective of this article is to investigate the latest research activities on the practical RF-EHWC design. The distribution of RF energy in the re

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Sampe, Jahariah, Farah Fatin Zulkifli, Nor Afidatul Asni Semsudin, Md Shabiul Islam, and Burhanuddin Yeop Majlis. "ULTRA LOW POWER HYBRID MICRO ENERGY HARVESTER USING RF, THERMAL AND VIBRATION FOR BIOMEDICAL DEVICES." International Journal of Pharmacy and Pharmaceutical Sciences 8, no. 2 (2016): 18. http://dx.doi.org/10.22159/ijpps.2016v8s2.15213.

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<p class="lead">The objective of this research is to design ultra-low power Hybrid Micro Energy Harvester (HMEH) circuit using hybrid inputs of radio frequency (RF), thermal and vibration for biomedical devices. In the HMEH architecture, three input sources (RF, thermal and vibration) are combined in parallel to solve the limitation issue of a single source energy harvester and to improve the system performance. Energy will be scavenged from the human body for thermal and vibration sources by converting directly temperature difference and human movement to electrical energy. The inputs a

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Wimmer, C., M. Barnes, N. den Harder, et al. "Beam divergence of RF negative hydrogen ion sources for fusion." Journal of Physics: Conference Series 2743, no. 1 (2024): 012033. http://dx.doi.org/10.1088/1742-6596/2743/1/012033.

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Abstract Neutral beam injectors (NBI) for fusion facilities have strict requirements on the beam divergence (7 mrad for the ITER NBI at 1 MeV). Measurements of the single beamlet divergence of RF negative ion sources (at lower beam energy < 100 keV) show significantly higher values (9–15 mrad), also larger than filament arc sources at similar beam energies. This opened up questions whether the higher divergence is caused by different measurement or evaluation techniques, whether it is a direct cause of the RF source, e.g. due to a higher temperature of negative ions or an oscillating extrac

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