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Journal articles on the topic 'High-frequency rejection'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Wang, Sen, and Chun‐Tuan Chang. "K‐band CMOS frequency doubler with high fundamental rejection." Electronics Letters 50, no. 17 (2014): 1211–12. http://dx.doi.org/10.1049/el.2014.0480.

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2

Seung-Hi Lee, Chung Choo Chung, and Choong Woo Lee. "Active high-frequency vibration rejection in hard disk drives." IEEE/ASME Transactions on Mechatronics 11, no. 3 (2006): 339–45. http://dx.doi.org/10.1109/tmech.2006.875556.

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3

Xie, Wei. "High frequency measurement noise rejection based on disturbance observer." Journal of the Franklin Institute 347, no. 10 (2010): 1825–36. http://dx.doi.org/10.1016/j.jfranklin.2010.10.002.

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4

Lee, Seung Hi, Chung Choo Chung, and Choong Woo Lee. "MC-10 HIGH FREQUENCY VIBRATION REJECTION IN HARD DISK DRIVES." Proceedings of JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2003 (2003): 24–25. http://dx.doi.org/10.1299/jsmemipe.2003.24.

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5

Zheng, Zhou, Meng Yuan Li, and Wei Jiang Wang. "A High Efficient Baseband GNSS Signal Narrow Band Anti-Jamming Approach in Frequency Domain." Advanced Materials Research 926-930 (May 2014): 1857–60. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1857.

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In order to reduce the burden of the calculation and the low frequency resolution of the tradition GNSS signal intermediate narrow band anti-jamming method, it introduces a high efficient approach of narrow band interference rejection based on baseband GNSS signal processing. After digital down conversion to baseband and down sampling to a low rate, the interference is removed in frequency domain. According to the theoretical analysis and simulation, it claims that the method can reduce the calculation and increase the detection resolution in frequency domain which will realize a high efficien

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6

Marpaung, David, Blair Morrison, Ravi Pant, and Benjamin J. Eggleton. "Frequency agile microwave photonic notch filter with anomalously high stopband rejection." Optics Letters 38, no. 21 (2013): 4300. http://dx.doi.org/10.1364/ol.38.004300.

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7

Ren, Yu-Jiun, Muhammad F. Farooqui, and Kai Chang. "A Compact Dual-Frequency Rectifying Antenna With High-Orders Harmonic-Rejection." IEEE Transactions on Antennas and Propagation 55, no. 7 (2007): 2110–13. http://dx.doi.org/10.1109/tap.2007.900275.

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8

O.D, Osunde, and Anyaoha S.N. "Immunity of Operational Amplifiers against High Frequency and High Amplitude Pulse Interferences." International Journal of Sciences Volume 3, no. 2014-08 (2014): 7–12. https://doi.org/10.5281/zenodo.3348765.

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The number of electronic (mobile) devices in the world is ever increasing. With this increase of transmitting devices, the electromagnetic interference (EMI) between those devices and other equipment becomes a bigger challenge. This raises the need for equipment and therefore integrated circuits that are more robust to the presence of Electromagnetic waves. In this study, the effect of radio frequency interference in operational amplifiers is dealt with by introducing a parameter to unambiguously specify the EMI robustness of an Op-Amp: EMI Rejection Ratio (EMIRR). This paper presents the back

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Chen, Jian, and Chien-In Henry Chen. "Process Variation Aware Wide Tuning Band Pass Filter for Steep Roll-Off High Rejection." VLSI Design 2015 (April 15, 2015): 1–9. http://dx.doi.org/10.1155/2015/408035.

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A wide tuning band pass filter (BPF) with steep roll-off high rejection and low noise figure is presented. The design feature of steep roll-off high stopband rejection (>20 dB) and low noise figure (<6 dB) provides a wide tuning frequency span (1–2.04 GHz) to accept desirable signals and reject close interfering signals. The process variation aware design approach demonstrates robustness of the BPF after calibration from process variations, operating in 1.04 GHz tuning frequency span: almost zero deviation on center frequency, an average maximum deviation 1.16 dB on a nominal pass band g

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Yin, Yue, Haobo Qi, Haodong Lu, et al. "A Novel Active Polyphase Filter Employing Frequency-Dependent Image Rejection Enhancement Technique." Micromachines 16, no. 1 (2025): 65. https://doi.org/10.3390/mi16010065.

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In low intermediate frequency (low-IF) receivers, image interference rejection is one of the core tasks to be accomplished. Conventional active polyphase filters (APPFs) are unable to have a sufficient image rejection ratio (IRR) at high operating frequencies due to the degradation of the IRR by the amplitude and phase imbalances produced by the secondary pole. The proposed solution to the above problem is a frequency-dependent image rejection enhancement technique based on secondary pole compensation. By adjusting the dominant pole frequency of the high-pass filter (HPF) appropriately, the pr

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11

Yang, Rong, Qi Liu, Eugene X. Wu, et al. "Experimental high-frequency ultrasound can detect graft rejection after small bowel transplantation." Journal of Pediatric Surgery 29, no. 2 (1994): 237–44. http://dx.doi.org/10.1016/0022-3468(94)90326-3.

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12

McVicar, John P., Kris Kowdley, Mary J. Emond, et al. "Induction immunosuppressive therapy is associated with a low rejection rate after liver transplantation." Clinical Transplantation 11, no. 4 (1997): 328–33. http://dx.doi.org/10.1111/j.1399-0012.1997.tb00828.x.

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Despite advances in immunosuppression, allograft rejection occurs frequently after liver transplantation. The use of induction therapy with cytolytic antibodies may decrease the frequency of rejection in liver transplant recipients, but may also increase the rate of cytomegalovirus (CMV) infection. It has been our center's strategy to use induction therapy in our liver transplant recipients. To determine the outcome of our strategy, we retrospectively reviewed all liver transplants performed in the first 5 yr of our liver transplant program. The frequency of acute rejection in the first year a

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13

Fang, Liew Hui, Syed Idris Syed Hassan, Fareq Malek, Yufridin Wahab, and Nurhakimah Mohd Mukhtar. "Review Compact Microwave Filter for Harmonic Rejection." Applied Mechanics and Materials 793 (September 2015): 286–91. http://dx.doi.org/10.4028/www.scientific.net/amm.793.286.

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An investigation of the several different techniques and method have been suggested in the design of compact microwave filters for the realization of high performance output micromachined microstrip low pass filters and highest attenuation loss is presented in this paper. It is shown that the basis for much fundamental microwave filter theory lies in the real of lumped-element filters, which lumped elements suffers for not suitable use in high frequency, because wavelength will decrease to short and the only distributed elements can practically well and the lumped elements circuit and work eff

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STORNELLI, V., L. PANTOLI, and G. LEUZZI. "HIGH QUALITY FACTOR L-BAND ACTIVE INDUCTOR-BASED BAND-PASS FILTERS." Journal of Circuits, Systems and Computers 22, no. 03 (2013): 1350014. http://dx.doi.org/10.1142/s021812661350014x.

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In this letter, a tunable high-Q active inductor with high dynamic range is presented. The equivalent inductance and resistance values can be tunable in a wide frequency range by changing the compensating network components values; outside the operating frequency band, the equivalent resistance increases, improving signal rejection for band-pass filter applications. A second-order active band-pass filter with a central frequency of 2100 MHz using the high-Q active inductance has been fabricated and tested.

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15

Lee, Hyunkyu, and Sanggeun Jeon. "A Q-Band CMOS Image-Rejection Receiver Integrated with LO and Frequency Dividers." Electronics 12, no. 14 (2023): 3069. http://dx.doi.org/10.3390/electronics12143069.

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This paper presents a Q-band image-rejection receiver using a 65 nm CMOS technology. For a high image-rejection ratio (IMRR), the Q-band receiver employs the Hartley architecture which consists of a Q-band low-noise amplifier, two down-conversion mixers, a 90° hybrid coupler, and two IF baluns. In addition, a Q-band fundamental voltage-controlled oscillator (VCO) and a frequency divider chain divided by 256 are integrated into the receiver for LO. A charge injection technique is employed in the mixers to reduce the DC power while maintaining a high conversion gain and linearity. The VCO adopts

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16

Li, Peixuan, Xihua Zou, Wei Pan, Lianshan Yan, and Shilong Pan. "Tunable Photonic Radio-Frequency Filter With a Record High Out-of-Band Rejection." IEEE Transactions on Microwave Theory and Techniques 65, no. 11 (2017): 4502–12. http://dx.doi.org/10.1109/tmtt.2017.2693148.

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17

Chikama, T., T. Naito, S. Watanabe, T. Kiyonaga, M. Suyama, and H. Kuwahara. "Optical heterodyne image-rejection receiver for high-density optical frequency division multiplexing system." IEEE Journal on Selected Areas in Communications 8, no. 6 (1990): 1087–94. http://dx.doi.org/10.1109/49.57812.

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18

Gentili, Fabrizio, Giovanni Bianchi, Luca Pelliccia, and Roberto Sorrentino. "High Q-factor compact filters with wide-band spurious rejection." International Journal of Microwave and Wireless Technologies 5, no. 6 (2013): 729–33. http://dx.doi.org/10.1017/s1759078713000718.

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A stepped-impedance configuration for coaxial resonators is employed to realize filters in the L-, S-, and C-bands exhibiting a wide spurious-free range. The geometry of a single rod resonator is optimized, by enlarging its top head, in order to maximize the ratio between the frequency of the first higher-order mode and that of the fundamental mode. This leads to the design of a very compact filter with high Q-factors and wide spurious-free bands, up to nearly 5 times the center frequency. To prove the effectiveness of the approach, a sixth-order filter has been designed and manufactured; the

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19

Yang, Weigao, Lixiang Liu, Xiaoqiang Su, Lijuan Dong, Yanhong Liu, and Zhanfeng Li. "Dynamic Modulation Band Rejection Filter Based on Spoof Surface Plasmon Polaritons." Electronics 9, no. 6 (2020): 993. http://dx.doi.org/10.3390/electronics9060993.

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In this paper, we proposed a dynamic modulation band rejection filter based on the spoof surface plasmon polaritons (SSPPs) waveguide. The dynamic adjusting mainly derives from changing the capacitance between the U-shape and the waveguide configuration. The capacitance can modulate the cut-off frequency of fundamental mode. The rejection band is formed by the high order propagation mode and the cut-off frequency of fundamental mode. We analyzed the dispersion curve and transmission performance of the band rejection filter with different capacitances. Compared with the previous scheme, the des

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Forbes, R. D., N. A. Parfrey, M. Gomersall, A. G. Darden, and R. D. Guttmann. "Dendritic cell-lymphoid cell aggregation and major histocompatibility antigen expression during rat cardiac allograft rejection." Journal of Experimental Medicine 164, no. 4 (1986): 1239–58. http://dx.doi.org/10.1084/jem.164.4.1239.

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To determine the pattern of cellular expression of donor MHC class I and class II antigens during the course of rat cardiac allograft rejection, ACI cardiac allografts transplanted to BN recipients were examined from day 2 to day 6 using immunohistologic and immunoelectron microscopic methods. We used both monomorphic and donor-specific mouse anti-rat MHC class I and class II mAbs in this study. In normal ACI hearts, MHC class I reactivity was confined to the vascular endothelium and to interstitial cells. Ongoing rejection was characterized by an increased donor MHC class I staining intensity

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21

Serdiuk, T. N., O. V. Shvets, and V. K. Ivanov. "THE SELECTION OF THE PULSE SIGNALS IN THE FACE OF STRONG INTERFERENCE FROM THE POWER OF NETWORKS." Science and Transport Progress, no. 32 (April 25, 2010): 218–23. http://dx.doi.org/10.15802/stp2010/13435.

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A compensation technique for rejection of the powerful narrow-band harmonics radiated by power mains is developed for application (in computer-aided system) of detection and registration of the pulse emissions radiated by partial or crown discharges in isolators of high-voltage power lines. The compensation algorithm for rejection of narrow-band interferences consists in the calculation of exact values of frequency, phase and amplitude of the mains’ harmonics by two points in a complex spectrum of the signal near the interference frequency, and in the formation of a compensation signal, which

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22

Abdul-Niby, M., M. Farhat, M. Nahas, and Μ. Μ. Alomari. "A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection." Engineering, Technology & Applied Science Research 7, no. 4 (2017): 1786–90. http://dx.doi.org/10.48084/etasr.1209.

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This paper presents a planar tri-band bandpass filter with high out-of-band rejection over a wide band. The filter is based on two pairs of λ/4 resonators embedded inside an open loop ring resonator without any size increase, where each pair of resonators are electromagnetically coupled to each other and the feedlines. This results in the excitations of passbands, where the first passband is generated by the open loop resonators. The second and the third passbands are excited by λ/4 resonators. The proposed technique provides sufficient degrees of freedom to control the center frequency and ba

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23

Abdul-Niby, M., M. Farhat, M. Nahas, and Μ. Μ. Alomari. "A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection." Engineering, Technology & Applied Science Research 7, no. 4 (2017): 1786–90. https://doi.org/10.5281/zenodo.844293.

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This paper presents a planar tri-band bandpass filter with high out-of-band rejection over a wide band. The filter is based on two pairs of λ/4 resonators embedded inside an open loop ring resonator without any size increase, where each pair of resonators are electromagnetically coupled to each other and the feedlines. This results in the excitations of passbands, where the first passband is generated by the open loop resonators. The second and the third passbands are excited by λ/4 resonators. The proposed technique provides sufficient degrees of freedom to control the center frequency and ba

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24

Shevchenko, O. P., A. A. Ulybysheva, A. V. Aksyonova, et al. "THE DIAGNOSTIC VALUE OF PLATELET-DERIVED FACTOR PDGF-BB AND ST2 IN HEART REJECTION." Russian Journal of Transplantology and Artificial Organs 18, no. 4 (2017): 71–76. http://dx.doi.org/10.15825/1995-1191-2016-4-71-76.

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Aim: to determine the association between plasma concentrations of biomarkers (sCD40L, PDGF-BB, PlGF-1, ST2) with histochemical and immunohistochemical signs of heart rejection.Materials and methods.The study included 98 heart recipients aged from 12 to 69 (mean age 43 ± 14) years, of which 78 men. In 68 patients dilated cardiomyopathy was diagnosed, 30 recipients were diagnosed with coronary heart disease. The concentrations of placental growth factor (PlGF-1), platelet-derived growth factor (PDGF-BB), soluble CD40 ligand (sCD40L) were measured using xMAP technology. The concentrations of ST2

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25

Jones, Barbara, Dave Collingridge, Caroline Vines, et al. "CDS in a Learning Health Care System: Identifying Physicians' Reasons for Rejection of Best-Practice Recommendations in Pneumonia through Computerized Clinical Decision Support." Applied Clinical Informatics 10, no. 01 (2019): 001–9. http://dx.doi.org/10.1055/s-0038-1676587.

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Background Local implementation of guidelines for pneumonia care is strongly recommended, but the context of care that affects implementation is poorly understood. In a learning health care system, computerized clinical decision support (CDS) provides an opportunity to both improve and track practice, providing insights into the implementation process. Objectives This article examines physician interactions with a CDS to identify reasons for rejection of guideline recommendations. Methods We implemented a multicenter bedside CDS for the emergency department management of pneumonia that integra

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26

Xiong, Mengfei, Junping Duan, and Binzhen Zhang. "A Band-Rejection Vivaldi Antenna with High Selectivity Using Hybrid HRW/CCLL." International Journal of Antennas and Propagation 2020 (April 23, 2020): 1–11. http://dx.doi.org/10.1155/2020/2061948.

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A simplified notched design method for the Vivaldi antenna is exhibiting high frequency-band-selectivity characteristics. By suitably introducing half-wavelength resonator (HWR) and complementary capacitively loaded loop (CCLL), the notched-band selectivity is promoted while maintaining the wide impedance bandwidth of the antenna applicable for wireless communications. HWR is bent in the middle to focus the first notch pole, and the second notch pole is obtained by CCLL on the radiating patch. Additionally, the resonant frequency of the notched pole can be determined by the position and size o

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27

Es-saqy, Abdelhafid, Maryam Abata, Mohammed Fattah, et al. "High rejection self-oscillating up-conversion mixer for fifth-generation communications." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 5 (2023): 4979–86. https://doi.org/10.11591/ijece.v13i5.pp4979-4986.

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This paper presents the design of a pseudomorphic high electron mobility transistor (pHEMT) self-oscillating mixer (SOM) for millimeter wave wireless communication systems. The 180° out-of-phase technique is chosen to both improve the desired lower sideband (LSB) signal and to achieve a satisfactory rejection of the unwanted signals (LO, USB and IF). This SOM is designed on the PH15 process of UMS foundry which is based on 0.15 µm GaAs pHEMT. The signal is up-converted from 2 GHz-IF frequency to 26 GHz-LSB frequency, using an autogenerated 28 GHz-LO signal. Simulations were performed using the

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Ford, Mandy L., Brent H. Koehn, Maylene E. Wagener, et al. "Antigen-specific precursor frequency impacts T cell proliferation, differentiation, and requirement for costimulation." Journal of Experimental Medicine 204, no. 2 (2007): 299–309. http://dx.doi.org/10.1084/jem.20062319.

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After a brief period of antigenic stimulation, T cells become committed to a program of autonomous expansion and differentiation. We investigated the role of antigen-specific T cell precursor frequency as a possible cell-extrinsic factor impacting T cell programming in a model of allogeneic tissue transplantation. Using an adoptive transfer system to incrementally raise the precursor frequency of antigen-specific CD8+ T cells, we found that donor-reactive T cells primed at low frequency exhibited increased cellular division, decreased development of multifunctional effector activity, and an in

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29

Xie, M., Q. Guo, and Y. Wu. "Design of a Miniaturized UWB Antenna with Band-Notched and High Frequency Rejection Capability." Journal of Electromagnetic Waves and Applications 25, no. 8-9 (2011): 1103–12. http://dx.doi.org/10.1163/156939311795761999.

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30

George, Thomas, and B. Lethakumary. "High frequency rejection using L shaped defected microstrip structure in ultra wideband bandpass filter." Materials Today: Proceedings 25 (2020): 265–68. http://dx.doi.org/10.1016/j.matpr.2020.01.363.

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31

Tang, Yanmei, Yan Bai, Congzhi Huang, and Bin Du. "Linear active disturbance rejection-based load frequency control concerning high penetration of wind energy." Energy Conversion and Management 95 (May 2015): 259–71. http://dx.doi.org/10.1016/j.enconman.2015.02.005.

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32

Wu, Qing Ping, and Shen Kai. "Design of Frequency Synthesizer Based on DDS + PLL Technology." Advanced Materials Research 846-847 (November 2013): 676–79. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.676.

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This paper presents a design plan for the frequency synthesizer base on DDS and PLL of the digital receiver, the main hardware selection is shown. Finally through the system test, the results show that the frequency accuracy of the frequency synthesizer reaches 3.72×10-8, the resolution is 1Hz, the phase noise is 103dBc/Hz@1 kHz the clutter rejection is 67dB and the frequency conversion time reaches 9.6ms. This frequency synthesizer can produce low phase noise, high resolution and high stability of the broadband signal. It has excellent technical performance, has been widely used in engineerin

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33

Mattern, Alexandra C., and Amy D. Marshall. "Aggression in the Context of Partner Threat: The Role of Trauma Exposure." Partner Abuse 11, no. 2 (2020): 140–57. http://dx.doi.org/10.1891/pa-d-19-00055.

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Trauma-related biased perception of threat, typically defined in terms of physical danger or harm, is associated with intimate partner aggression perpetration. Yet, it is unclear if such threat (a) functionally motivates aggression and (b) includes diverse forms of threat. Theory and limited research suggest that threats of rejection/abandonment and social dominance may be two distinct functional precipitants of aggression among trauma-exposed individuals. Sixty-four heterosexual couples (N = 128 individuals) selected for elevated symptoms of posttraumatic stress disorder in either partner wer

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Wu, Bin, Chaoyue Zheng, Hao Zhang, and Qingchun Zhao. "A Reconfigurable Local Oscillator Harmonic Mixer with Simultaneous Phase Shifting and Image Rejection." Electronics 13, no. 5 (2024): 971. http://dx.doi.org/10.3390/electronics13050971.

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The multibeam high-throughput satellites (HTS) are regarded as a crucial component in the forthcoming space-based Internet of Things (S-IoT) network. The multi-band frequency conversion capability of HTS is essential for achieving high-capacity information interconnection in the S-IoT network. To enhance the frequency conversion capability of the on-board payload, a reconfigurable local oscillator (LO) harmonic mixer with simultaneous phase shifting and image-rejection is proposed and demonstrated based on a polarization division multiplexing dual-parallel Mach–Zehnder modulator (PDM-DPMZM). B

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35

Germeau, Catherine, Wenbin Ma, Francesca Schiavetti, et al. "High frequency of antitumor T cells in the blood of melanoma patients before and after vaccination with tumor antigens." Journal of Experimental Medicine 201, no. 2 (2005): 241–48. http://dx.doi.org/10.1084/jem.20041379.

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After vaccination of melanoma patients with MAGE antigens, we observed that even in the few patients showing tumor regression, the frequency of anti-vaccine T cells in the blood was often either undetectable or &lt;10−5 of CD8 T cells. This frequency being arguably too low for these cells to be sole effectors of rejection, we reexamined the contribution of T cells recognizing other tumor antigens. The presence of such antitumor T cells in melanoma patients has been widely reported. To begin assessing their contribution to vaccine-induced rejection, we evaluated their blood frequency in fiv

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36

Es-saqy, Abdelhafid, Maryam Abata, Mohammed Fattah, et al. "High rejection self-oscillating up-conversion mixer for fifth-generation communications." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 5 (2023): 4979. http://dx.doi.org/10.11591/ijece.v13i5.pp4979-4986.

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<span lang="EN-US">This paper presents the design of a pseudomorphic high electron mobility transistor (pHEMT) self-oscillating mixer (SOM) for millimeter wave wireless communication systems. The 180° out-of-phase technique is chosen to both improve the desired lower sideband (LSB) signal and to achieve a satisfactory rejection of the unwanted signals (LO, USB and IF). This SOM is designed on the PH15 process of UMS foundry which is based on 0.15 µm GaAs pHEMT. The signal is up-converted from 2 GHz-IF frequency to 26 GHz-LSB frequency, using an autogenerated 28 GHz-LO signal. Simulations

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37

Zhang, Junli, Baochun Lu, Chuanjun Chen, and Zhengyang Li. "A New Active Disturbance Rejection Control Tuning Method for High-Order Electro-Hydraulic Servo Systems." Actuators 13, no. 8 (2024): 296. http://dx.doi.org/10.3390/act13080296.

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In our industry, active disturbance rejection control already has been used to enhance the performance of the electro-hydraulic servo systems, despite the fact that electro-hydraulic servo systems are usually reduced to first-order and second-order systems. The aim of this paper is to extend the application of active disturbance rejection control to high-order electro-hydraulic servo systems by introducing a new tuning method. Active disturbance rejection control is transformed into two separate parts in the frequency domain: a pre-filter H(s) and a controller T(s). The parameters of the pre-f

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Wang, Lin, Shijiao Liu, Shuning Liang, Xuelian Liu, and Chunyang Wang. "Research on Active Repetitive Control for Tracking Lissajous Scan Trajectories with Voice Coil Motors Actuated Fast Steering Mirror." Fractal and Fractional 8, no. 3 (2024): 128. http://dx.doi.org/10.3390/fractalfract8030128.

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The performance of laser beams in tracking Lissajous scan trajectories is severely limited by beam jitter. To enhance the performance of fast steering mirror (FSM) control in tracking Lissajous scan trajectories, this paper proposed a fractional order active disturbance rejection controller (FOADRC) and verified its effectiveness in improving system scanning tracking accuracy. A dynamic mathematical model of a fast steering mirror was studied, and the design of parameters for the control mode of the closed-loop system was determined. A reduced-order linear active disturbance rejection controll

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Dinh, Anh, та Jiandong Ge. "A Q-Enhanced 3.6 GHz, Tunable, Sixth-Order Bandpass Filter Using 0.18 μm CMOS". VLSI Design 2007 (18 червня 2007): 1–9. http://dx.doi.org/10.1155/2007/84650.

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An experimental filter was designed to operate at 3.6 GHz using mainstream 0.18 μm CMOS. In the design, the Q-enhancement technique was used to overcome the low-Q characteristics of the CMOS on-chip inductors. A sixth-order bandpass filter with a wide passband and a high image rejection was built by cascading three stages of second-order Q-enhanced filters. A combination of three biquads with offset in center frequency provides wider tuning frequency and bandwidth. This high-performance filter provides a 340 MHz tunable center frequency around 3.6 GHz, an image rejection of 50 dB and a tunable

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Guazzo, Giovanni Maria, and Consiglia Nappo. "FOOD SELECTIVITY IN AUTISM SPECTRUM DISORDER: A CASE STUDY." International Journal of Education and Social Science Research 07, no. 03 (2024): 305–15. http://dx.doi.org/10.37500/ijessr.2024.7322.

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“Food selectivity” describes quite different food situations and behaviours: food rejection, limited food repertoire, and high-frequency single food intake; that is, it is an atypical complex behaviour that also has a great impact on caregivers and leads children to discriminate foods based on different parameters (shape, colour, texture, presentation, temperature, etc.) and affects 30% of the general pediatric population and more than 70% of those with autism. In this paper, the authors implement an ABA intervention with a seven-year-old boy with autism who ate only a few foods, all with a li

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Rodriguez, R., R. Finger, F. P. Mena, et al. "Digital compensation of the sideband-rejection ratio in a fully analog 2SB sub-millimeter receiver." Astronomy & Astrophysics 619 (November 2018): A153. http://dx.doi.org/10.1051/0004-6361/201732316.

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Context. In observational radio astronomy, sideband-separating receivers are preferred, particularly under high atmospheric noise, which is usually the case in the sub-millimeter range. However, obtaining a good rejection ratio between the two sidebands is difficult since, unavoidably, imbalances in the different analog components appear. Aims. We describe a method to correct these imbalances without making any change in the analog part of the sideband-separating receiver, specifically, keeping the intermediate-frequency (IF) hybrid in place. This opens the possibility of implementing the meth

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Voronov, Artem, Richard R. A. Syms, and Oleksiy Sydoruk. "High-Performance Magnetoinductive Directional Filters." Electronics 11, no. 6 (2022): 845. http://dx.doi.org/10.3390/electronics11060845.

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Multiport magnetoinductive (MI) devices with directional filter properties are presented. Design equations are developed and solved using wave analysis and dispersion theory, and it is shown that high-performance directional filters can be realised for use both in MI systems with complex, frequency-dependent impedance and in conventional systems with real impedance. Wave analysis is used to reduce the complexity of circuit equations. High-performance MI structures combining directional and infinite rejection filtering are demonstrated, as well as multiple-passband high-rejection filtering. A n

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Sun, Guanqun, Wang Ma, Yingge Wang, et al. "Load Rejection Overvoltage Suppression and Parameter Design Method of UHV AC Transmission Line." Electronics 14, no. 3 (2025): 619. https://doi.org/10.3390/electronics14030619.

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UHV (ultra-high voltage) by instant AC transmission system is accompanied by huge reactive power transmission. When the load drops sharply, it is easy to produce serious power frequency overvoltage, which is also defined as load rejection overvoltage. This paper makes an in-depth analysis from the perspective of voltage increase caused by instantaneous load unloading, and obtains the causes and key influencing factors of load rejection overvoltage. Taking the UHV AC transmission line of a practical project as an example, the suppression effect of the suppression strategy represented by the ins

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Sghir, Elmahjouby. "Development of Compactness of Reconfigurable LPF/BSF Using a Simple Technique for Radar Applications." ITM Web of Conferences 48 (2022): 02001. http://dx.doi.org/10.1051/itmconf/20224802001.

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In this paper a new compact reconfigurable low pass/band stop filter using a miniature omega resonator placed in a small DGS in the ground. The reconfiguration in frequency response can be achieved with the same topology and the same dimensions by changing just the position of channel slot which connect the omega resonator to the metallic ground without any other requirements. Several advantages obtained with this structure based on the use of one omega resonator cell such as simplicity of fabrication, very low insertion loss in the pass bands, a high rejection in the stop band with a sharp tr

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Liu, Jiahao, Zhiqiang Zeng, Shangyao Shi, and Pengyun Chen. "Internal Model Principle-Based Extended State Observer for the Uncertain Systems with Nonconstant Disturbances." Actuators 13, no. 1 (2024): 29. http://dx.doi.org/10.3390/act13010029.

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Existing traditional expansion state observers exhibit good tracking performance for constant and low-frequency disturbances. However, their ability to track non-constant disturbances such as ramp and high-frequency harmonics is inadequate. This paper proposes an extended state observer design method based on the internal model principle. This method achieves precise tracking of non-constant disturbances in the system, effectively addressing the issue of disturbance estimation errors in conventional expansion state observers. When applied to control systems, this approach significantly mitigat

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Elmahjouby, Sghir, Errkik Ahmed, Zbitou Jamal, El abdellaoui Larbi, Tajmouati Abdelali, and Latrach Mohamed. "A novel compact CPW tunable stop band filter using a new Z-DGS-resonator for microwave applications." TELKOMNIKA Telecommunication, Computing, Electronics and Control 17, no. 5 (2019): 2410–17. https://doi.org/10.12928/TELKOMNIKA.v17i5.12193.

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The paper presents a novel very compact CPW bandstop filter. The designed structure consists of one unit of new Z-DGS resonator, placed on top layer of ground plane between the input and output this structure, which is excited by 50-ohm coplanar line. The designed filter can be used in X-Band applications as the band stop can be shifted to any other desired frequency by tuning the length of the Z-DGS. The proposed filter topology has as benefits good performances in terms of wide stop-band rejection, low insertion loss, high return loss, simple design and more small size (17.908×10 mm2 )

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Bhutani, Shiv, Shelley Harris, Michelle Carr, et al. "Evaluating the Clinical Relevance of Antibodies against Non-Human Leukocyte Antigen in Kidney Transplantation." Antibodies 13, no. 2 (2024): 44. http://dx.doi.org/10.3390/antib13020044.

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Introduction: Kidney transplantation is the preferred modality of kidney replacement therapy for eligible patients with end-stage kidney disease (ESKD), given that it has been found to reduce mortality rates, improve quality of life, and is cost-effective compared to dialysis. Recent advancements in human leukocyte antigen (HLA) typing and donor-specific antibody (DSA) detection have helped to reduce the risk of rejection, but antibody-mediated rejection (AMR) can still occur without DSA. Previous studies suggest that rejection can be attributed to antibodies against Non-Human Leucocyte Antige

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Lu, Wen Tao, and Yu Qing Li. "Research of the Key Technologies for Explosion-Proof and Intrinsically Safe High Voltage Frequency Converter." Applied Mechanics and Materials 494-495 (February 2014): 1552–55. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1552.

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Some key technical problems encountered in making mine-used explosion-proof and intrinsically safe high-voltage frequency converter are researched and discussed. The inverter integrates common-mode voltage rejection of DC reactor, deionized water circulation cooling technology, selective harmonic elimination technology, explosion-proof technology, adopts advanced Power Flex7000 with good speed regulation performance. The circulation water cooling device presented in this paper has high cooling efficiency, small size, lower operating noise and good water-saving effect. This inverter has actuall

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Peng, Hao, Chunhua Wang, and Xiaotong Tian. "A Novel Current–Mode High–Frequency Polyphase Filter using Multi–Output Current Differencing Transconductance Amplifiers." Journal of Electrical Engineering 67, no. 5 (2016): 311–22. http://dx.doi.org/10.1515/jee-2016-0046.

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Abstract This paper introduces a novel polyphase filter working at high centre frequency using multi-output current differencing transconductance amplifiers (MOCDTAs). The MOCDTA possesses characteristics of low input impedance, high output impedance, wide work frequency and linearly adjustable transconductance. The proposed filter consists of two MOCDTAs, two grounded capacitors, and no resistors. The features of low input impedance and high output impedance make it suitable for cascade. The bandwidth and centre frequency could be adjusted independently by external bias voltage VC and VCa. Th

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Fadel, Fatina I., Hafez M. Bazaraa, Doaa M. Salah, et al. "Lymphocyte Activation Markers in Pediatric Kidney Transplant Recipients." International Journal of Biomedical Science 11, no. 3 (2015): 121–30. http://dx.doi.org/10.59566/ijbs.2015.11121.

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Background and objectives: The role of CD4+CD25+ T regulatory cells (Tregs) in immune tolerance in experimental transplantation is very important but the clinical significance of circulating Tregs in the peripheral blood is undetermined. We evaluated the association between the frequency of T cell activation markers CD25 and CD71 and clinical parameters that may affect the level of these T cell markers. Methods: In 47peditric kidney transplant (KT) recipients and 20 healthy controls, the frequency of T cell activation markers, CD25 and CD71 was measured with flow cytometry after transplantatio

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