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Journal articles on the topic 'Low power excitation source'

Author: Grafiati

Published: 6 September 2023

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1

Wang, Yong Qing, Na Chong, Li Mei Dong, Yu Jun Tang, and Hai Jun Song. "Study on Electronic Excitation Temperature of Argon Plasma Using Low Pressure Micro-ICP Excitation Source." Advanced Materials Research 383-390 (November 2011): 1844–48. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1844.

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Electronic excitation temperature is an important indicator of the spectrometer excitation source. This work experimented self-made micro-ICP excitation spectroscopy based on PCB technology, and detected 17 spectral lines in 690~860 nm of argon atom. 763.51 nm and 772.42 nm spectral lines whose wavelengths are close to were used to calculate electronic excitation temperature of argon excited by micro-ICP, and results show in 1600~3000 K. Experimental test data shows effects of argon gas pressure on electronic excitation temperature that in 20~210 Pa electronic excitation temperature increases

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2

Allen, G. Mark, and David M. Coleman. "Characterization of a Dual Inductively Coupled Plasma Atomic Emission Source." Applied Spectroscopy 41, no. 3 (1987): 381–87. http://dx.doi.org/10.1366/0003702874449039.

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A dual inductively copuled plasma atomic emission spectroscopic system is described. This new analytical discharge segregates the normally integrated processes of sampling and spectral excitation associated with atomic emission sources. A low-power, low-argon-flow, radio-frequency plasma is used as a sampling device to create gaseous species from liquid and solid samples which are subsequently transported to a second plasma for excitation. Design and construction of instrumentation and associated operational parameters are reviewed. Comparisons of the sampling and the excitation plasmas includ

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3

Abolmasov, P. K., S. N. Fabrika, and O. N. Sholukhova. "The optical counterpart of the ultraluminous X-ray source NGC6946 ULX-1." Proceedings of the International Astronomical Union 2, S238 (2006): 229–32. http://dx.doi.org/10.1017/s1743921307005029.

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AbstractWe present a study of a peculiar nebula MF16 associated with an Ultraluminous X-ray Source NGC6946 ULX-1. We use integral-field and long-slit spectral data obtained with the 6-m telescope (Russia). The nebula was for a long time considered powered by strong shocks enhancing both high-excitation and low-excitation lines. However, kinematical properties point to rather moderate expansion rates (VS ∼ 100÷200 km s−1). The total power of the emission-line source exceeds by one or two orders of magnitude the power observed expansion rate can provide, that points towards the existence of an a

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4

Zhou, Fen Ping, Yang Jiao, and Hui Juan Duan. "Design of Excitation Source for Ultrasonic Guided Waves Based on DDS Technology." Advanced Materials Research 1049-1050 (October 2014): 674–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.674.

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According to the characteristics of ultrasonic guided wave inspection, An exciting power, used for exciting ultrasonic guided waves in pipeline is designed based on DDS and FPGA. The excitation source consists of FPGA, D/A conversion circuit, a low-pass filter circuit and power amplifier circuit. Constructing DDS based on FPGA as the controller and signal generator. Filter circuit and power amplifier circuit are designed in this paper. The experiment results show that the excitation source can have high voltage and high frequency output capability, and can generate desired signal type with a g

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5

Leonard, James D., Gen Katagiri, and Terry L. Gustafson. "Quasi-Continuous Generation of 211-nm Excitation for Resonance Raman Spectroscopy." Applied Spectroscopy 48, no. 4 (1994): 489–92. http://dx.doi.org/10.1366/000370294775268901.

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We demonstrate the generation of 211-nm radiation using sum frequency mixing of the second and third harmonics of a cw mode-locked Nd: YLF laser operating at 76 MHz as an excitation source for resonance Raman spectroscopy. Owing to the relatively low peak power (∼4 W) but high average power (∼8 mW), we obtain good-quality spectra with relatively short collection times. In order to demonstrate the utility of this source, we have obtained the Raman spectra of several biological molecules and an inorganic molecule, ruthenium trisbipyridine, using 211-nm excitation.

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Wang, Yong Qing, Na Chong, Rong Xia Sun, Ying Chang Zhou, and Wen Jun Chen. "Study on Start Burning Performance of Micro-ICP Using Stereo Spiral Coil." Advanced Materials Research 383-390 (November 2011): 390–94. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.390.

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According to the problem of low energy utilization of plane spiral coil used in micro-ICP, a kind of micro stereo helical coil was designed. Made 24 different structural parameters of stereo spiral coil whose diameter range 3~10 mm. Using comprehensive experimental method tested different parameters’ coils inspire argon plasma. In 13.56MHz RF power, relationships between argon pressure, coil turns, coil diameter and combustion /maintaining power of micro-ICP excitation source were tested. From spectrometer observed 17 argon emission spectrum in 690~860 nm. Spectral lines intensity influenced b

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Xie, Xinying, Kaiqi Chen, Zhichao Zhou, et al. "P‐1.4: Oxygen‐Plasma Induced Generation of Mobile Charge Carriers in Indium‐Tin‐Zinc Oxide." SID Symposium Digest of Technical Papers 54, S1 (2023): 448–50. http://dx.doi.org/10.1002/sdtp.16328.

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Mobile charge carriers can be generated in indium‐tinzinc oxide (ITZO) covered with a silicon oxide layer when subjected to an oxygen plasma treatment. The resulting ‍resistivity is sensitive to the thickness of the cover oxide, the plasma excitation power, and the treatment time. With 280 ‍nm of cover oxide and 10 mins of treatment, a low resistivity of 1.2 mΩ∙cm can be obtained in a plasma biased ‍with a radio frequency excitation power of 100 W and an inductively coupled plasma excitation power of 2000 W. ‍The treatment has been deployed to form the source/drain regions of a self‐aligned, t

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8

Deng, Yujia, Wen Zeng, Xiaoming Jiang, and Xiandeng Hou. "Portable photochemical vapor generation-microwave plasma optical emission spectrometer." Journal of Analytical Atomic Spectrometry 35, no. 7 (2020): 1316–19. http://dx.doi.org/10.1039/d0ja00104j.

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A low power microwave plasma torch as an excitation source was combined with a photochemical vapor generator (PVG) and a miniaturized charge-coupled device to construct a portable optical emission spectrometer.

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9

Higashino, Kohta, Naoki Okamura, Teruyoshi Sasayama, and Takashi Yoshida. "Application of square-wave inverter in excitation system for magnetic nanoparticle tomography." AIP Advances 12, no. 3 (2022): 035012. http://dx.doi.org/10.1063/9.0000266.

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To collect the signals of magnetic nanoparticles (MNPs) at a distance from a magnetic nanoparticle tomography, a strong ac magnetic field should be generated by applying a high current to the excitation coil. To this end, sinusoidal excitation using a linear amplifier-type ac power source has been applied to the tomography. Although this source can provide a high-quality sinusoidal voltage, its low power efficiency is not suitable for generating the required high current. To overcome this limitation, we use an H-bridge voltage source inverter to achieve high efficiency by generating a square-w

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10

Bodduluri, Mani Teja, Torben Dankwort, Thomas Lisec, et al. "Fully Integrated High-Performance MEMS Energy Harvester for Mechanical and Contactless Magnetic Excitation in Resonance and at Low Frequencies." Micromachines 13, no. 6 (2022): 863. http://dx.doi.org/10.3390/mi13060863.

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Energy harvesting and storage is highly demanded to enhance the lifetime of autonomous systems, such as IoT sensor nodes, avoiding costly and time-consuming battery replacement. However, cost efficient and small-scale energy harvesting systems with reasonable power output are still subjects of current development. In this work, we present a mechanically and magnetically excitable MEMS vibrational piezoelectric energy harvester featuring wafer-level integrated rare-earth micromagnets. The latter enable harvesting of energy efficiently both in resonance and from low-g, low-frequency mechanical e

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11

Fisher, W. G., E. A. Wachter, Fred E. Lytle, Michael Armas, and Colin Seaton. "Source-Corrected Two-Photon Excited Fluorescence Measurements between 700 and 880 nm." Applied Spectroscopy 52, no. 4 (1998): 536–45. http://dx.doi.org/10.1366/0003702981944085.

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Passively mode-locked titanium:sapphire (Ti:S) lasers are capable of generating a high-frequency train of transform-limited subpico-second pulses, producing peak powers near 105 W at moderate average powers. The low energy per pulse (<20 nJ) permits low fluence levels to be maintained in tightly focused beams, reducing the possibility of saturating fluorescence transitions. These properties, combined with a wavelength tunability from approximately 700 nm to 1 μm, provide excellent opportunities for studying simultaneous two-photon excitation (TPE). However, pulse formation is very sensitive

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Streli, Christina, P. Wobrauschek, H. Aiginger, W. Ladisich, and R. Rieder. "Total Reflection Xrf of Light Elements Using Various Excitation Sources." Advances in X-ray Analysis 37 (1993): 577–83. http://dx.doi.org/10.1154/s0376030800016128.

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AbstractTotal Reflection X-Ray Fluorescence Analysis (TXRF) has been proved to be well suited for the energy dispersive analysis of light elements using a special spectrometer, which is equipped with an energy dispersive detector having all properties for the detection of low energy radiation. The detection of the light elements is strongly influenced by the excitation source which should provide a large number of photons with energies near the K-absorption edge of these elements (0.2 - 3 keV). Various standard tubes with Be-window as well as a homemade windowless tube are compared, all differ

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Beliy, V. B. "ANALYSIS OF OVERVOLTAGE POSSIBILITY ON THE EXCITATION WINDING OF A SYNCHRONOUS GENERATOR OF AUTONOMOUS POWER SUPPLY SYSTEM IN CASE OF EXTERNAL SYMMETRICAL SHORT CIRCUIT." Vestnik Altajskogo gosudarstvennogo agrarnogo universiteta, no. 11 (2021): 112–15. http://dx.doi.org/10.53083/1996-4277-2021-205-11-112-115.

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Reliable supply of consumers with electric energy largely depends on the reliability of power source function-ing. In the context of this paper it depends on synchronous generators operating in autonomous power supply sys-tems. In contrast to the power plant generators which are part of power systems and are protected from the loads by sufficiently large resistances, power supply systems withautonomous generators are characterized by rather low resistances. Abrupt changes in the supply load parameters, their own transient and emergency modes, for example, short circuits at the generator termin

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14

Wang, Chuang, Zhen Wang, Weiguo Yan, Hongkun Li, and Chunli Yang. "Study on Characteristics of the Vibration and Noise of High-Power Scroll Compressor." Shock and Vibration 2021 (September 9, 2021): 1–17. http://dx.doi.org/10.1155/2021/5953133.

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With the rapid development of a high-power scroll compressor (HSC), the dynamic performance of a scroll compressor has an important impact on the vibration and noise of the whole compressor. So, the dynamic characteristics and structural acoustic radiation characteristics of HSC under dynamic excitation are studied by simulation and experiment in this paper. Firstly, the dynamic simulation model of HSC is established to analyze the time-domain and frequency-domain characteristics of bearing excitation and upper support excitation. At the same time, the finite element models of housing, upper s

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15

Kou, Zi Ming, Chun Yue Lu, Juan Wu, and Hui Xian Zhang. "A New Hydraulic Excitation Mode with Liquid-Filled Pipe." Advanced Materials Research 279 (July 2011): 280–86. http://dx.doi.org/10.4028/www.scientific.net/amr.279.280.

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The current vibration modes, whether inertial vibration or hydraulic vibration, have some problems such as large power consumption and low energy utilization rate. A new low energy hydraulic excitation mode is presented. This mode takes the high-pressured pipe as the new excitation source. Periodic pressure pulsation generated by wave exciter makes the pipe vibrating. The vibration mode of pipe with fluid-structure interaction is established and solved with numerical method. The modal analysis and the simulation of the vibration have been carried out. An experimental platform is built to verif

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16

Burge, Leah E., and Murray S. Korman. "Photoacoustic LED imaging apparatus using a low-cost system." Journal of the Acoustical Society of America 151, no. 4 (2022): A249. http://dx.doi.org/10.1121/10.0011223.

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The use of compact and cost-effective visible light emitting diodes (LEDs) as an alternative to Q-switched lasers, the conventional photoacoustic excitation source, has been explored for vascular imaging applications [T. J. Allen and P. C. Beard, “Light emitting diodes as an excitation source for biomedical photo-acoustics,” Proc. SPIE 8581, 85811F (2013)]. This research motivated our work. Experiments used a 619 nm LED (Luminus SST-90-R-F11-HH100) pulsed for 450 ns with period 34 ms utilizing a pulse generator, MOSFET driver and power MOSFET switch, discharging a bank of capacitors (990 μ F)

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17

Stefan, John T., and Alexander G. Kosovichev. "Analysis and Modeling of High-frequency Emission and Deep Seismic Sources of Sunquakes." Astrophysical Journal Letters 937, no. 2 (2022): L26. http://dx.doi.org/10.3847/2041-8213/ac8f92.

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Abstract Recent work published by Lindsey et al. find evidence for a deep and compact seismic source for the sunquake associated with the 2011 July 30 M9.3 flare, as well as seismic emission extending up to 10 mHz. We examine the sunquake independently, and a possible wave front is found in the 8 mHz band, though no wave front is easily discernible in the 10 mHz band. Additionally, we perform numerical simulations of seismic excitation modeled with the reported parameters and changes in the power spectra with increasing depth of the excitation source are examined. It is found that the peak fre

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18

Choi, Yo-Seb, Suk-Yoon Hong, Jee-Hun Song, Hyun-Wung Kwon, and Jee-Hwoon Kang. "Power transformer excitation force estimation for load noise reduction using experimental apparatus based on beamforming theory." Noise Control Engineering Journal 70, no. 1 (2022): 77–89. http://dx.doi.org/10.3397/1/37706.

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To comply with noise regulations in residential areas, low-noise electrical transformers must be developed. However, it is difficult to accurately reflect the frequency characteristics of the transformer, which have a large influence on the noise produced, because the high voltage and current make it impossible to experimentally measure the internal excitation forces involved. In this paper, we propose a new method using an experimental apparatus for estimating the internal excitation forces experienced by transformers whose results accurately reflect the actual frequency characteristics of th

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19

Chen, Tunan, Fengxiang Ma, Yue Zhao, Zhenghai Liao, Zongjia Qiu, and Guoqiang Zhang. "Cantilever enhanced based photoacoustic detection of SF₆ decomposition component SO₂ using UV LED." Sensor Review 42, no. 1 (2022): 70–75. http://dx.doi.org/10.1108/sr-12-2020-0292.

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Purpose This paper aims to establish a photoacoustic detection system for SO2 using UV-LED and testify its feasibility for sensitive measurement. The work in this paper can avoid potential crossover interference in infrared (IR) range and also balance the capability and cost of feasible excitation for photoacoustic detection system. Design/methodology/approach In this experimental work, a cantilever-enhanced–based photoacoustic SO2 detection system using an ultraviolet (UV) LED light source with a light power of 4 mW as the excitation was established. Findings A feasible photoacoustic detectio

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20

Wang, Kemeng, Yangfan Gu, Yongchang Lu, Jianqiang Gu, and Weili Zhang. "Terahertz radiation enhancement in gallium arsenide nano-hole array under low power optical pump." Applied Physics Letters 121, no. 7 (2022): 071703. http://dx.doi.org/10.1063/5.0099288.

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Though accelerating photocarriers by the semiconductor surface electric field is the simplest way to generate broadband terahertz pulses, the weak THz power under low optical pump hinders its application in these compact systems. Here, we report a ⟨100⟩ semi-insulating gallium arsenide nano-hole array under above-the-bandgap excitation, which boosts terahertz emission power up to 5.75 folds of bare gallium arsenide with a 32 mW pump. The nano-structured array lifts the absorption of the optical pump and localizes the photocarriers near the surface of gallium arsenide, benefiting the transient

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21

Wang, Jie, Mostafa R. A. Nabawy, Andrea Cioncolini, Alistair Revell, and Samuel Weigert. "Planform Geometry and Excitation Effects of PVDF-Based Vibration Energy Harvesters." Energies 14, no. 1 (2021): 211. http://dx.doi.org/10.3390/en14010211.

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In the present paper, we report a systematic investigation of planform geometry and excitation level effects on the dynamics and power generation characteristics of polyvinylidene difluoride (PVDF)-based cantilevered vibration energy harvesters. Piezoelectric vibration energy harvesters provide a promising energy harvesting solution for widespread use of wireless sensors in remote locations. Highly flexible PVDF polymers offer resonant frequencies at suitable range for harvesting mechanical energy within low-frequency applications, though information on the efficient sizing of these devices is

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22

Liu, Gui Lin, Xin Li Song, and Wei Song. "Analysis on Coordination of Loss of Excitation Protection, Out-of-Step Protection and Out-of-Step Splitting." Advanced Materials Research 971-973 (June 2014): 398–401. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.398.

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In units’ grid-related protection, loss of excitation protection and out-of-step protection are very important to ensure the stable running of grid. If both can realize the right coordination when unit occur a phenomenon of low excitation, it can improve the level of power source coordinated with grid. However, there is a problem in the coordination of both. Propose an idea to solve the problem based on power angle. Besides, out-of-step protection and out-of-step splitting exists a coordination relation according to the location of out-of-step oscillation center. In order to prevent the collap

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Nikishechkin, Anatolij. "To the question of constructing measuring devices based on fluxgate sensors." MATEC Web of Conferences 298 (2019): 00048. http://dx.doi.org/10.1051/matecconf/201929800048.

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The article discusses the issues of feeding fluxgates from compact, low-power generators built on AND-NOT logic elements. The frequency of such generators depends on the magnitude of the measured magnetic field strength. This gives reason to consider the possibility of using frequency as a useful signal. The article discusses the issues of feeding fluxgates from compact, low-power generators built on AND-NOT logic elements. The frequency of such generators depends on the magnitude of the measured magnetic field strength. This gives reason to consider the possibility of using frequency as a use

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24

König, Karsten. "Two-Photon near Infrared Excitation in Living Cells." Journal of Near Infrared Spectroscopy 5, no. 1 (1997): 27–34. http://dx.doi.org/10.1255/jnirs.97.

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Non-linear effects due to two-photon near infrared (NIR) excitation of endogenous and exogenous cellular chromophores allow novel techniques in tissue, cell and biomolecule diagnostics, as well as in intracellular micromanipulation (e.g. intracellular photochemistry). Two-photon NIR excitation may also result in cell damage effects. The high photon intensities (1024 photons cm−2 s−1) required for non-resonant two-photon excitation can be achieved by diffraction-limited focusing of continuous wave (cw) laser beams (cw microbeams) with powers in the mW range. For example, NIR traps (“laser tweez

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25

Godin, Oleg A., and Iosif M. Fuks. "Transmission of acoustic-gravity waves through gas–liquid interfaces." Journal of Fluid Mechanics 709 (August 10, 2012): 313–40. http://dx.doi.org/10.1017/jfm.2012.336.

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AbstractIt was demonstrated recently that gas–liquid interfaces, which are usually almost perfect reflectors of acoustic waves, become anomalously transparent, and the power flux in the wave transmitted into the gas increases dramatically, when a compact sound source in the liquid approaches the interface within a fraction of the wavelength (Godin, Phys. Rev. Lett., vol. 97, 2006b, 164301). Powerful underwater explosions and certain natural sources, such as underwater landslides, generate very low-frequency waves in water and air, for which fluid buoyancy and compressibility simultaneously ser

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Benson, Ronda L., Koichi Iwata, William L. Weaver, and Terry L. Gustafson. "Improvements in the Generation of Quasi-Continuous, Tunable Ultraviolet Excitation for Raman Spectroscopy: Applications to Drug/Nucleotide Interactions." Applied Spectroscopy 46, no. 2 (1992): 240–45. http://dx.doi.org/10.1366/0003702924125591.

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We demonstrate the generation of quasi-continuous ultraviolet excitation at wavelengths shorter than 240 nm using the frequency-doubled output of a synchronously pumped picosecond dye laser operating in the region of 420 nm. Owing to the relatively low peak power but high average power of the system, we obtain high-quality resonance Raman spectra at wavelengths as short as 209 nm. We apply the source to the study of the binding of anticancer drugs to DNA. In particular, we compare the binding of cis-diamminedichloroplatinum (II) (cisplatin) and cis-diammine-1, 1-cyclobutane dicarboxylate plati

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Balakrishnan, Gurusamy, Ying Hu, Steen Brøndsted Nielsen, and Thomas G. Spiro. "Tunable kHz Deep Ultraviolet (193–210 nm) Laser for Raman Applications." Applied Spectroscopy 59, no. 6 (2005): 776–81. http://dx.doi.org/10.1366/0003702054280702.

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The performance characteristics of a kilohertz solid-state laser source for ultraviolet Raman spectroscopy are described. Deep ultraviolet (UV) excitation in the 193–210 nm region is provided by mixing of the fundamental and third harmonics of a Ti–sapphire laser, which is pumped by the second harmonic of a Q-Switched Nd–YLF laser. The combination of tunability, narrow linewidth, high average power, good stability, and kilohertz repetition rate makes this laser suitable for deep UV resonance Raman applications. The short pulse duration (∼20 ns) permits nanosecond time resolution in pump–probe

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Duan, Yixiang, Xiaoguang Du, Yimu Li, and Qinhan Jin. "Characterization of a Modified, Low-Power Argon Microwave Plasma Torch (MPT) as an Atomization Cell for Atomic Fluorescence Spectrometry." Applied Spectroscopy 49, no. 8 (1995): 1079–85. http://dx.doi.org/10.1366/0003702953965128.

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A microwave plasma torch (MPT) has been newly modified and used as an atomization cell for atomic fluorescence spectrometry (AFS). The analytical performance of the MPT-AFS system has been characterized with hollow cathode lamps (HCLs) working in the pulsed mode as an excitation source and a pneumatic nebulizer for aqueous sample introduction. The method exhibits a relatively large dynamic range over at least three orders of magnitude in concentration and fairly good precision in a range from 0.42% (Zn) to 4.9% (Ag). It was found that observation height, microwave power, and plasma support-gas

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Mohan, Manoj Kumar Chandra, Sang Kyun Shim, June Key Lee, Nakwon Jang, Naesung Lee, and Wael Z. Tawfik. "Optimized Aluminum Reflector for Enhancement of UVC Cathodoluminescence Based-AlGaN Materials with Carbon Nanotube Field Emitters." Molecules 26, no. 13 (2021): 4025. http://dx.doi.org/10.3390/molecules26134025.

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The far ultraviolet C (UVC) light sources based on carbon nanotube (CNT) field emitters as excitation sources have become promising light sources for sterilization, disinfection, and water purification. However, the low light extraction efficiency of UVC–CNT light sources still hinders the practical application of these structures. Herein, we report an optimized aluminum (Al) reflector to enhance the light extraction efficiency of UVC–CNT light sources. Optical analysis of UVC-CNT light sources covered by the Al reflectors with various thicknesses ranging from 30 to 150 nm was performed to rea

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Fang, Yuan Yuan, Guo Hong Zhang, Ya Fan Li, and Peng Zhe Qi. "Design of Vibration Isolation Device for Ship Power Equipment and Investigation on its Dynamic Properties." Applied Mechanics and Materials 496-500 (January 2014): 1129–33. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1129.

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Mechanical noise caused by power equipment vibration is the main source of underwater radiated noise of the ship, and vibration isolation and noise reduction of ship equipment has been widely concerned. Therefore,a vibration isolation system designed for four sets of auxiliary engine of ship cabin was investigated in the paper, aimed to further reveal the influence of various parameters including floating raft shell thickness, excitation source, and different ship hull and installation platform thickness on the vibration level difference of system. The results obtained from numerical analysis

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Niu, B., and N. Olhoff. "Minimization of vibration power transmission from rotating machinery to a flexible supporting plate." International Journal of Structural Stability and Dynamics 14, no. 03 (2014): 1350068. http://dx.doi.org/10.1142/s0219455413500685.

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This paper deals with the problem of optimum design of a foundation for rotating machinery with a view to minimize vibration transmission from a machine source to its supporting structure. The problem of analysis and optimization of the installation systems of machinery has been extensively researched on the assumption of a rigid supporting structure. The design based on a rigid supporting structure model is reasonable for the installation of machinery in many real engineering situations. However, this rigid support based model may not be appropriate for the problem studied herein where the ma

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Nazari, P., M. L. van Gelder, E. F. van Dishoeck, et al. "Complex organic molecules in low-mass protostars on Solar System scales." Astronomy & Astrophysics 650 (June 2021): A150. http://dx.doi.org/10.1051/0004-6361/202039996.

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Context. The chemical inventory of planets is determined by the physical and chemical processes that govern the early phases of star formation. Nitrogen-bearing species are of interest as many provide crucial precursors in the formation of life-related matter. Aims. The aim is to investigate nitrogen-bearing complex organic molecules towards two deeply embedded Class 0 low-mass protostars (Perseus B1-c and Serpens S68N) at millimetre wavelengths with the Atacama Large Millimeter/submillimeter Array (ALMA). Next, the results of the detected nitrogen-bearing species are compared with those of ox

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Guo, Zhe, Hanxian Fang, and Farideh Honary. "The Generation of ULF/ELF/VLF Waves in the Ionosphere by Modulated Heating." Universe 7, no. 2 (2021): 29. http://dx.doi.org/10.3390/universe7020029.

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One of the most important effects of ionospheric modification by high power, high frequency (HF) waves is the generation of ultra low frequency/extremely low frequency/very low frequency (ULF/ELF/VLF) waves by modulated heating. This paper reviews the scientific achievements of the past five decades regarding the main mechanisms of excitation of ULF/ELF/VLF waves and discusses their characteristics, such as their electrojet dependency, the location of the source region, continuous and discontinuous waves, the number of HF arrays, and the suitable range of the modulation frequency for different

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Özçelik, Mehmet Ali. "Operating the Induction Motor as a Generator Mode by Supplying DC Voltage and Investigation of the End Voltage Depending on the Excitation Current and RPM." International Journal of Energy Research 2023 (July 24, 2023): 1–8. http://dx.doi.org/10.1155/2023/9967218.

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Asynchronous or induction machines are among the leading devices in the electrical industry. They are well suited for motor and production applications with power ratings from a few kilowatts to megawatts. In addition, their use in renewable energy systems, especially in wind conversion systems, is increasing daily due to their advantages, such as low cost, brushless, and robust structure. In this work, the operation of a three-phase asynchronous motor with a winding rotor as an alternator, the variation of the voltage produced depending on the excitation current by keeping the number of revol

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Lavrinovica, I., A. Supe, and J. Porins. "Experimental Measurement of Erbium-Doped Optical Fibre Charecteristics for Edfa Performance Optimization." Latvian Journal of Physics and Technical Sciences 56, no. 2 (2019): 33–41. http://dx.doi.org/10.2478/lpts-2019-0011.

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Abstract The paper presents experimental study of the major erbium-doped fibre amplifier (EDFA) features such as gain at low signal and gain saturation by an application of different erbium-doped optical fibres (EDFs). The main objective of the research is to estimate how the performance of EDFA varies depending on the length of doped fibre, pumping configuration scheme, as well as excitation source power. It is shown that a high gain coefficient of 16–20 dB can be practically achieved.

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Smilek, Jan, and Zdenek Hadas. "Experimental evaluation of Tusi couple based energy harvester for scavenging power from human motion." MATEC Web of Conferences 211 (2018): 05004. http://dx.doi.org/10.1051/matecconf/201821105004.

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This paper deals with the experimental performance evaluation of the prototype of a novel inertial energy harvester based on Tusi couple mechanism. The harvester was developed as an autonomous power source for environments with very low frequency and magnitude of mechanical vibrations available. The experiments were conducted using human body during different activities as a source of mechanical excitation, with the prospect of using the harvester for powering up future wearable electronic devices. Four different locations on a single measurement specimen were picked for the harvester placemen

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Lundberg, Karl-Ola. "An Alternative Method for Measurement of Airborne Sound Insulation." Building Acoustics 8, no. 1 (2001): 57–74. http://dx.doi.org/10.1260/1351010011501731.

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A method for determination of the transmission coefficient from Complex Modulation Transfer Functions CMTF:s based on measured impulse-responses is shown. In the method a separate measurement of the equivalent sound absorption area is not needed in contrast to in the standardised measurement. By averaging over a number of estimates of the impulse-response the influence of background noise can be reduced substantially, implying that low-power sources can be used. A model for the power balance in the receiving room with time-varying power is considered. In the model the quotient of the receiving

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Ma, Chengjian, Yang Liu, and Changyu Shen. "Phase-Extraction-Based MFL Testing for Subsurface Defect in Ferromagnetic Steel Plate." Sensors 22, no. 9 (2022): 3322. http://dx.doi.org/10.3390/s22093322.

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Magnetic flux leakage (MFL) based on phase extraction for detecting the subsurface defects in ferromagnetic steel plate was investigated. The relationship between electromagnetic field phase and the subsurface defect was analyzed. Low-frequency alternating current (AC) excitation source and high-power magnetizer arrangement with Hall sensor were used to increase the skin depth of the MFL. Experiments results showed that 12 mm deep subsurface defect can be detected by using the phase extraction means, which is about two times higher than that by using the amplitude method.

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Balthazar, José Manoel, Reyolando Manoel Lopes Rabelo da Fonseca Brasil, and F. J. Garzeri. "On Non-Ideal Simple Portal Frame Structural Model: Experimental Results under a Non-Ideal Excitation." Applied Mechanics and Materials 1-2 (September 2004): 51–58. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.51.

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We present measurements of the non-linear oscillations of a portal frame foundation for a non-ideal motor. We consider a three-time redundant structure with two columns, clamped in their bases and a horizontal beam. An electrical unbalanced motor is mounted at mid span of the beam. Two non-linear phenomena are studied: a) mode saturation and energy transfer between modes; b)interaction between high amplitude motions of the structure and the rotation regime of a real limited power motor. The dynamic characteristics of the structure were chosen to have one-to-two internal resonance between the a

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Xie, Liming, Feng Tian, Jun Liu, and Hao Chen. "Analysis on the Causes of Cracking at the Last Stage Blade of the Low-pressure Rotor in thermal power plant." E3S Web of Conferences 165 (2020): 06010. http://dx.doi.org/10.1051/e3sconf/202016506010.

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Transverse cracking occurred in the blade body of the last stage of the low pressure rotor of a 200MW unit in a thermal power plant. The causes of blade cracking were analyzed by means of macro morphology, SEM, microstructure, mechanical properties, chemical composition and energy spectrum analysis. The results show that the corrosive Cl- accumulates on leaves, and then combined action of tensile stress is formed with the static load and dynamic load during the blade operation, and the stress corrosion microcracks had been conceived in the Cl- corrosion region. Under the long period cyclic exc

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Rittmann, Johannes, Markus Rahammer, Niels Holtmann, and Marc Kreutzbruck. "A mobile nondestructive testing (NDT) system for fast detection of impact damage in fiber-reinforced plastics (FRP)." Journal of Sensors and Sensor Systems 9, no. 1 (2020): 43–50. http://dx.doi.org/10.5194/jsss-9-43-2020.

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Abstract. Impact damage in fiber-reinforced plastics, such as carbon-fiber-reinforced plastics (CFRP) and glass-fiber-reinforced plastics (GFRP), involves high challenges to nondestructive testing (NDT). The anisotropic material structure significantly complicates the interpretation of results in conventional testing. Resonant frequency sweep thermography (RFST) based on local defect resonance combined with well-known ultrasonic thermography enables the fast and simple detection of relevant impact damages. RFST utilizes frequency sweep excitation in the low- and mid-kilohertz range to activate

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Che Mustapha, Nurul Arfah, A. H. M. Zahirul Alam, Sheroz Khan, and Amelia Wong Azman. "EFFICIENT CAPACITANCE SENSING FOR WIRELESS HEALTH MONITORING SYSTEM." IIUM Engineering Journal 17, no. 2 (2016): 21–29. http://dx.doi.org/10.31436/iiumej.v17i2.609.

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This paper presents a low power capacitance to voltage converter (CVC) circuit using two differential amplifier circuits, two Schottky rectifier diodes constructed in symmetrical manner and combined with instrumentation amplifier circuits. The differential capacitance to voltage simulation work has been realized with cheap discrete components. Combination energy from solar, vibration and heat is expected to be used to source the capacitance circuit. Constant dc voltage of 3 V has been used to source the CVC circuit in this work. It is found by the simulation, the converter circuit consumes 3.9

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Keenan, Mary, Eileen T. Meyer, Markos Georganopoulos, Karthik Reddy, and Omar J. French. "The relativistic jet dichotomy and the end of the blazar sequence." Monthly Notices of the Royal Astronomical Society 505, no. 4 (2021): 4726–45. http://dx.doi.org/10.1093/mnras/stab1182.

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ABSTRACT Our understanding of the unification of jetted AGN has evolved greatly as jet samples have increased in size. Here, based on the largest-ever sample of over 2000 well-sampled jet spectral energy distributions, we examine the synchrotron peak frequency – peak luminosity plane, and find little evidence for the anticorrelation known as the blazar sequence. Instead, we find strong evidence for a dichotomy in jets, between those associated with efficient or ‘quasar-mode’ accretion (strong/type II jets) and those associated with inefficient accretion (weak/type I jets). Type II jets include

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Pierce, J. C. S., C. N. Tadhunter, and R. Morganti. "The radio properties of high-excitation radio galaxies with intermediate radio powers." Monthly Notices of the Royal Astronomical Society 494, no. 2 (2020): 2053–67. http://dx.doi.org/10.1093/mnras/staa531.

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ABSTRACT In the past decade, high-sensitivity radio surveys have revealed that the local radio active galactic nucleus population is dominated by moderate-to-low power sources with emission that is compact on galaxy scales. High-excitation radio galaxies (HERGs) with intermediate radio powers (22.5 &lt; log (L1.4 GHz) &lt; 25.0 W Hz−1) form an important sub-group of this population, since there is strong evidence that they also drive multiphase outflows on the scales of galaxy bulges. Here, we present high-resolution Very Large Array observations at 1.5, 4.5, and 7.5 GHz of a sample of

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Rahmani, Amir Reza, Steve Bryant, Chun Huh, et al. "Crosswell Magnetic Sensing of Superparamagnetic Nanoparticles for Subsurface Applications." SPE Journal 20, no. 05 (2015): 1067–82. http://dx.doi.org/10.2118/166140-pa.

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Summary Stable dispersions of superparamagnetic nanoparticles that are already in use in biomedicine as image-enhancing agents also have potential use in subsurface applications. Surface-coated nanoparticles are capable of flowing through micron-sized pores across long distances in a reservoir, with modest retention in rock. These particles change the magnetic permeability of the flooded region, and thus one can use them to enhance images of the flood. In this paper, we model the propagation of a “ferrofluid” slug in a reservoir and its response to a crosswell magnetic tomography system. This

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Duan, Rujiao, Xuyun Yang, Yonggang Qi, and Zhe Liu. "Design of a precise current source with adjustable frequency for AC-FSM." Journal of Physics: Conference Series 2290, no. 1 (2022): 012039. http://dx.doi.org/10.1088/1742-6596/2290/1/012039.

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Abstract AC-FSM is a new technology of external monitoring the internal corrosion for oil and gas pipelines. The current source stability of the FSM equipment is one of the important factors affecting the monitoring accuracy. According to the equipment requirements, a precision current source with adjustable frequency is designed. With C8051MCU as the control core, DAC conversion and differential amplifier are used to control the frequency and the current amount. The experiment shows that the output of excitation power supply has good consistency, the changing range was less than 0.3 %. When t

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Swapna, M. S., and S. Sankararaman. "Low-power CW laser-assisted synthesis of plasmonic aluminium nanoparticles using low duty cycle optical chopper." Canadian Journal of Physics 100, no. 3 (2022): 145–51. http://dx.doi.org/10.1139/cjp-2021-0042.

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This paper reports continuous wave (CW) laser-assisted synthesis of plasmonic aluminium nanoparticles (ANPs) by drastically reducing the laser power density from the existing 105 W/cm2 to 9 W/cm2 using a specially designed ultralow duty cycle chopper. The aluminium target is subjected to laser irradiation by keeping it in a liquid medium maintained at a specific temperature. The effect of chopping frequencies (F), temperatures (T), and surfactant-glucose (C) on the formation of ANPs are investigated through field emission scanning electron microscopic and UV-visible spectroscopic analyses. The

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Ali, Hassan, Erwan Sulaiman, Zamri Omar, M. F. Omar, and Faisal Amin. "2D-FEA Based Design and Performance Analysis of Low Weight Segmented Rotor HE-FSM for Light Weight Aircrafts." International Journal of Engineering & Technology 7, no. 2.23 (2018): 152. http://dx.doi.org/10.14419/ijet.v7i2.23.11905.

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All electric aircraft (AEA), is one of the main intentions of the aerospace industry for future. Where electrical machines are capable to provide high torque density and are dominant for the feasibility of direct drive electrical driving force for aircraft applications. Besides, low weight and high torque capabilities, the best candidate solution should also inherently fault tolerant for aircraft applications. For these reasons, a new sort of machine has been familiarized and published in last decade know as flux switching machine (FSM). FSMs contain all excitation sources on stator side with

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Seltzer, M. D., and R. B. Green. "Direct Laser Ionization in Analytically Useful Flames." Applied Spectroscopy 43, no. 2 (1989): 257–63. http://dx.doi.org/10.1366/0003702894203165.

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Direct laser ionization (DLI) proceeds by resonant excitation of analyte followed by photoionization of the excited-state atoms. Photoionization is accomplished with the use of off-resonant radiation, which is usually obtained from the dye laser pumping source. DLI has been shown to enhance ionization yields, relative to laser-enhanced ionization (LEI), in low-temperature atom reservoirs where collisional ionization is inefficient. In the present study, DLI has been demonstrated in high-temperature, analytically useful flames, with similar results. DLI detection limits and spectral interferenc

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Benamimour, Tariq, Amar Bentounsi, and Hind Djeghloud. "Study of Wind Turbine based Variable Reluctance Generator using Hybrid FEMM-MATLAB Modeling." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 1 (2017): 1. http://dx.doi.org/10.11591/ijece.v7i1.pp1-11.

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Based on exhaustive review of the state of the art of the electric generators fitted to Wind Energy Conversion System (WECS), this study is focused on an innovative machine that is a Variable Reluctance Generator (VRG). Indeed, its simple and rugged structure (low cost), its high torque at low speed (gearless), its fault-tolerance (lowest maintenance), allow it to be a potential candidate for a small wind power application at variable wind speed. For better accuracy, a finite element model of a studied doubly salient VRG is developed using open source software FEMM to identify the electromagne

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