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Article: Improvement of AlGaN/GaN HEMTs Linearity Using Etched-Fin Gate Structure for Ka Band Applications.

Lee, Ming-Wen / Lin, Yueh-Chin / Hsu, Heng-Tung / Gamiz, Francisco / Chang, Edward-Yi

2023 Volume 14, Issue 5

Abstract: ... fabricated to improve device linearity for Ka-band application are reported. Within the proposed study ... of wireless power amplifier components for Ka band applications. ...

Abstract	In this paper, AlGaN/GaN high electron mobility transistors (HEMTs) with etched-fin gate structures fabricated to improve device linearity for Ka-band application are reported. Within the proposed study of planar, one-etched-fin, four-etched-fin, and nine-etched-fin devices, which have 50-μm, 25-μm, 10-μm, and 5-μm partial gate widths, respectively, the four-etched-fin gate AlGaN/GaN HEMT devices have demonstrated optimized device linearity with respect to the extrinsic transconductance (Gm) value, the output third order intercept point (OIP3), and the third-order intermodulation output power (IMD3) level. The IMD3 is improved by 7 dB at 30 GHz for the 4 × 50 μm HEMT device. The OIP3 is found to reach a maximum value of 36.43 dBm with the four-etched-fin device, which exhibits high potential for the advancement of wireless power amplifier components for Ka band applications.
Language	English
Publishing date	2023-04-25
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2620864-7
ISSN	2072-666X
ISSN	2072-666X
DOI	10.3390/mi14050931
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Generalized Rapid Synthesis of Supported Nanocluster Catalyst for Mild Hydrogenation of Phenol toward KA Oil.

Wei, Hehe / Shao, Shengxian / Deng, Bohan / Xue, Yufeng / Chen, Wenxing / Yin, Linlin / Lin, Yunxiang / Hussain, Naveed / Wu, Xiaodong / Ge, Binghui / Zheng, Fengbin / Li, Guodong / Liu, Li-Min / Wu, Hui

Small (Weinheim an der Bergstrasse, Germany)

2023 Volume 19, Issue 36, Page(s) e2207759

Abstract: Homogeneous and nanometric metal clusters with unique electronic structures are promising for catalysis, however, common synthesis techniques for metal clusters suffer from large size and even metal nanocrystals attributing to their high surface energy ... ...

Abstract	Homogeneous and nanometric metal clusters with unique electronic structures are promising for catalysis, however, common synthesis techniques for metal clusters suffer from large size and even metal nanocrystals attributing to their high surface energy and unsaturated configurations. Herein, a generalized rapid annealing strategy for synthesizing a series of supported metal clusters as superior catalysts is developed. Remarkably, TiO
Language	English
Publishing date	2023-05-07
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2168935-0
ISSN	1613-6829 ; 1613-6810
ISSN (online)	1613-6829
ISSN	1613-6810
DOI	10.1002/smll.202207759
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: High precise dating on the variation of the Asian summer monsoon since 37 ka BP.

Li, Ting-Yong / Wu, Yao / Shen, Chuan-Chou / Li, Jun-Yun / Chiang, Hong-Wei / Lin, Ke / Tan, Liang-Cheng / Jiang, Xiu-Yang / Cheng, Hai / Edwards, R Lawrence

Scientific reports

2021 Volume 11, Issue 1, Page(s) 9375

Abstract: ... spanning the past thirty-seven thousand years (ka BP, before AD 1950) from Furong Cave, southwestern China ... during the YD began at 12.92 ka BP and lasted for 430 years. The occurrence of the 200-yr Older Dryas ... during the BA period was dated from 13.87 to 14.06 ka BP. The durations of the three Heinrich (H) events ...

Abstract	Comprehensive comparison of paleoclimate change based on records constrained by precise chronology and high-resolution is essential to explore the correlation and interaction within earth climate systems. Here, we propose a new stalagmite-based multidecadal resolved Asian summer monsoon (ASM) record spanning the past thirty-seven thousand years (ka BP, before AD 1950) from Furong Cave, southwestern China. This record is consistent with the published Chinese stalagmite sequences and shows that the dominant controls of the ASM dynamics include not only insolation and solar activity but also suborbital-scale hydroclimate events in the high latitudes of the northern hemisphere, such as the Heinrich events, Bølling-Allerød (BA), and Younger Dryas (YD). Benefit from the unprecedented accurate chronology, the timings of these events are precisely dated, with uncertainties of, at most, 40 years (2σ). The onset of the weak ASM during the YD began at 12.92 ka BP and lasted for 430 years. The occurrence of the 200-yr Older Dryas during the BA period was dated from 13.87 to 14.06 ka BP. The durations of the three Heinrich (H) events, H1, H2, and H3, are 14.33-18.29, 23.77-24.48, and 28.98-30.46 ka BP, respectively. Furong record shows surprisingly variable onset transitions of 980, 210, and 40 years for the corresponding weak ASM events. These discrepancies suggest different influences of the H events on ASM dynamics. During the periods of H 1-3, the obvious difference between our Furong record and NGRIP δ
Language	English
Publishing date	2021-04-30
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-021-88597-7
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Improvement of AlGaN/GaN High-Electron-Mobility Transistor Radio Frequency Performance Using Ohmic Etching Patterns for Ka-Band Applications.

Lee, Ming-Wen / Chuang, Cheng-Wei / Gamiz, Francisco / Chang, Edward-Yi / Lin, Yueh-Chin

Micromachines

2023 Volume 15, Issue 1

Abstract: ... OEPs) "fabricated to improve device radio frequency (RF) performance for Ka-band applications" are ...

Abstract	In this paper, AlGaN/GaN high-electron-mobility transistors (HEMTs) with ohmic etching patterns (OEPs) "fabricated to improve device radio frequency (RF) performance for Ka-band applications" are reported. The fabricated AlGaN/GaN HEMTs with OEP structures were used to reduce the source and drain resistances (
Language	English
Publishing date	2023-12-30
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2620864-7
ISSN	2072-666X
ISSN	2072-666X
DOI	10.3390/mi15010081
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Ka Band Holographic Imaging System Based on Linear Frequency Modulation Radar.

Meng, Yang / Lin, Chuan / Zang, Jiefeng / Qing, Anyong / Nikolova, Natalia K

Sensors (Basel, Switzerland)

2020 Volume 20, Issue 22

Abstract: ... planar system at Ka band for the three-dimensional simultaneous imaging of both sides of an inspected ...

Abstract	Millimeter wave (MMW) technology is expanding rapidly into security screening for dangerous items concealed under clothing. It uses safe non-ionizing radiation and penetrates clothing well. We present a new planar system at Ka band for the three-dimensional simultaneous imaging of both sides of an inspected person where the images are produced in real time by a recently proposed generalized holographic reconstruction algorithm. Low-cost linear frequency modulation (LFM) radar technology is used along with a simple but efficient method for system calibration. Experimental characterization of the spatial resolution and the sensitivity of the system prototype has been carried out. It is established that the achieved spatial resolution is 6 mm or better if the item is not obscured by clothing and it may deteriorate to 7 mm depending on the clothing hiding the item. The spatial sensitivity is confirmed to be at least 2 mm.
Language	English
Publishing date	2020-11-15
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s20226527
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: NADPH and Mito-Apocynin Treatment Protects Against KA-Induced Excitotoxic Injury Through Autophagy Pathway.

Liu, Na / Lin, Miao-Miao / Huang, Si-Si / Liu, Zi-Qi / Wu, Jun-Chao / Liang, Zhong-Qin / Qin, Zheng-Hong / Wang, Yan

Frontiers in cell and developmental biology

2021 Volume 9, Page(s) 612554

Abstract: ... by Kainic acid (KA) and its mechanism.: Methods: The : Results: In this study, we have successfully ... established excitotoxic model by KA : Conclusion: In summary, combined administration of NADPH and NOX ...

Abstract	Aim: Previous research recognizes that NADPH can produce reduced glutathione (GSH) as a coenzyme and produce ROS as a substrate of NADPH oxidase (NOX). Besides, excessive activation of glutamate receptors results in mitochondrial impairment. The study aims at spelling out the effects of NADPH and Mito-apocynin, a NOX inhibitor which specifically targets the mitochondria, on the excitotoxicity induced by Kainic acid (KA) and its mechanism. Methods: The Results: In this study, we have successfully established excitotoxic model by KA Conclusion: In summary, combined administration of NADPH and NOX inhibitors offers better neuroprotection by reducing NADPH as a NOX substrate to generate ROS. The combined use of NADPH and Mito-apocynin can better restore neurons and mitochondrial function through autophagy pathway.
Language	English
Publishing date	2021-02-11
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2737824-X
ISSN	2296-634X
ISSN	2296-634X
DOI	10.3389/fcell.2021.612554
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: TIGAR plays neuroprotective roles in KA-induced excitotoxicity through reducing neuroinflammation and improving mitochondrial function.

Huang, Si-Si / Sheng, Yi-Chao / Jiang, Yi-Yue / Liu, Na / Lin, Miao-Miao / Wu, Jun-Chao / Liang, Zhong-Qin / Qin, Zheng-Hong / Wang, Yan

Neurochemistry international

2021 Volume 152, Page(s) 105244

Abstract: ... excitotoxicity model was constructed via stereotypical kainic acid (KA) injection into the striatum of mice. KA ... overexpression could reverse KA-induced neuronal injury by reducing neuroinflammation and improving mitochondrial ...

Abstract	Excitotoxicity refers to the ability of excessive extracellular excitatory amino acids to damage neurons via receptor activation. It is a crucial pathogenetic process in neurodegenerative diseases. TP53 is confirmed to be involved in excitotoxicity. It is demonstrated that TP53 induced glycolysis and apoptotic regulator (TIGAR)-regulated metabolic pathway can protect against neuronal injury. However, the role of TIGAR in excitotoxicity and specific mechanisms is still unknown. In this study, an in vivo excitotoxicity model was constructed via stereotypical kainic acid (KA) injection into the striatum of mice. KA reduced TIGAR expression levels, neuroinflammatory responses and mitochondrial dysfunction. TIGAR overexpression could reverse KA-induced neuronal injury by reducing neuroinflammation and improving mitochondrial function, thereby exerting neuroprotective effects. Therefore, this study could provide a potential therapeutic target for neurodegenerative diseases.
MeSH term(s)	Animals ; Apoptosis Regulatory Proteins/drug effects ; Apoptosis Regulatory Proteins/metabolism ; Excitatory Amino Acid Agonists/pharmacology ; Kainic Acid/pharmacology ; Mice, Transgenic ; Mitochondria/drug effects ; Mitochondria/metabolism ; Neuroinflammatory Diseases/chemically induced ; Neuroinflammatory Diseases/drug therapy ; Neuroprotection/drug effects ; Neuroprotective Agents/pharmacology ; Phosphoric Monoester Hydrolases/metabolism
Chemical Substances	Apoptosis Regulatory Proteins ; Excitatory Amino Acid Agonists ; Neuroprotective Agents ; Phosphoric Monoester Hydrolases (EC 3.1.3.2) ; TIGAR protein, mouse (EC 3.1.3.2) ; Kainic Acid (SIV03811UC)
Language	English
Publishing date	2021-11-24
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	283190-9
ISSN	1872-9754 ; 0197-0186
ISSN (online)	1872-9754
ISSN	0197-0186
DOI	10.1016/j.neuint.2021.105244
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: High precise dating on the variation of the Asian summer monsoon since 37 ka BP

Ting-Yong Li / Yao Wu / Chuan-Chou Shen / Jun-Yun Li / Hong-Wei Chiang / Ke Lin / Liang-Cheng Tan / Xiu-Yang Jiang / Hai Cheng / R. Lawrence Edwards

Scientific Reports, Vol 11, Iss 1, Pp 1-

2021 Volume 14

Abstract: ... spanning the past thirty-seven thousand years (ka BP, before ad 1950) from Furong Cave, southwestern China ... during the YD began at 12.92 ka BP and lasted for 430 years. The occurrence of the 200-yr Older Dryas ... during the BA period was dated from 13.87 to 14.06 ka BP. The durations of the three Heinrich (H) events ...

Abstract	Abstract Comprehensive comparison of paleoclimate change based on records constrained by precise chronology and high-resolution is essential to explore the correlation and interaction within earth climate systems. Here, we propose a new stalagmite-based multidecadal resolved Asian summer monsoon (ASM) record spanning the past thirty-seven thousand years (ka BP, before ad 1950) from Furong Cave, southwestern China. This record is consistent with the published Chinese stalagmite sequences and shows that the dominant controls of the ASM dynamics include not only insolation and solar activity but also suborbital-scale hydroclimate events in the high latitudes of the northern hemisphere, such as the Heinrich events, Bølling-Allerød (BA), and Younger Dryas (YD). Benefit from the unprecedented accurate chronology, the timings of these events are precisely dated, with uncertainties of, at most, 40 years (2σ). The onset of the weak ASM during the YD began at 12.92 ka BP and lasted for 430 years. The occurrence of the 200-yr Older Dryas during the BA period was dated from 13.87 to 14.06 ka BP. The durations of the three Heinrich (H) events, H1, H2, and H3, are 14.33–18.29, 23.77–24.48, and 28.98–30.46 ka BP, respectively. Furong record shows surprisingly variable onset transitions of 980, 210, and 40 years for the corresponding weak ASM events. These discrepancies suggest different influences of the H events on ASM dynamics. During the periods of H 1–3, the obvious difference between our Furong record and NGRIP δ18O record indicated the decoupling correlation between the mid-low latitudes and high latitudes. On the other hand, synchronous climate change in high and low latitudes suggests another possibility which different to the dominant role of Northern high latitudes in triggering global climate change. Our high quality records also indicate a plausible different correlation between the high and mid-low latitudes under glacial and inter-glacial background, especially for the ASM regimes.
Keywords	Medicine ; R ; Science ; Q
Subject code	550
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Wind Speed Retrieval Using Global Precipitation Measurement Dual-Frequency Precipitation Radar Ka-Band Data at Low Incidence Angles

Chong Jiang / Lin Ren / Jingsong Yang / Qing Xu / Jinyuan Dai

Remote Sensing, Vol 14, Iss 1454, p

2022 Volume 1454

Abstract: ... dual-frequency precipitation radar (DPR) Ka-band data. In order to establish the Ka-band model at low ... incidence angles, the dependence of the DPR Ka-band normalized radar cross section (NRCS) on the wind speed ... This model links the Ka-band NRCS to the incidence angle, wind speed, and SST. Additionally, the wind speed ...

Abstract	In this study, sea surface wind speed was retrieved using the Global Precipitation Measurement (GPM) dual-frequency precipitation radar (DPR) Ka-band data. In order to establish the Ka-band model at low incidence angles, the dependence of the DPR Ka-band normalized radar cross section (NRCS) on the wind speed, incidence angle, sea surface temperature (SST), significant wave height (SWH), and sea surface current speed (CSPD) was analyzed first. We confirmed that the normalized radar cross section depends on the wind speed, incidence angle, and SST. Second, an empirical model at low incidence angles was established. This model links the Ka-band NRCS to the incidence angle, wind speed, and SST. Additionally, the wind speed was retrieved by the model and was validated via the GPM Microwave Imager (GMI) wind product. The validation yielded a root mean square error (RMSE) of 1.45 m/s and the RMSE was better at a lower incidence angle and a higher SST. This model may expand the use of GPM DPR data in enriching the sea surface wind speed data set. It is also helpful for other Ka-band spaceborne radars at low incidence angles to measure wind speed in the future.
Keywords	global precipitation measurement dual-frequency precipitation radar ; Ka-band ; low incidence angles ; wind speed retrieval ; SST ; Science ; Q
Subject code	551
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Wind Speed Retrieval Using Global Precipitation Measurement Dual-Frequency Precipitation Radar Ka-Band Data at Low Incidence Angles

Jiang, Chong / Ren, Lin / Yang, Jingsong / Xu, Qing / Dai, Jinyuan

Remote Sensing. 2022 Mar. 18, v. 14, no. 6

2022

Abstract	In this study, sea surface wind speed was retrieved using the Global Precipitation Measurement (GPM) dual-frequency precipitation radar (DPR) Ka-band data. In order to establish the Ka-band model at low incidence angles, the dependence of the DPR Ka-band normalized radar cross section (NRCS) on the wind speed, incidence angle, sea surface temperature (SST), significant wave height (SWH), and sea surface current speed (CSPD) was analyzed first. We confirmed that the normalized radar cross section depends on the wind speed, incidence angle, and SST. Second, an empirical model at low incidence angles was established. This model links the Ka-band NRCS to the incidence angle, wind speed, and SST. Additionally, the wind speed was retrieved by the model and was validated via the GPM Microwave Imager (GMI) wind product. The validation yielded a root mean square error (RMSE) of 1.45 m/s and the RMSE was better at a lower incidence angle and a higher SST. This model may expand the use of GPM DPR data in enriching the sea surface wind speed data set. It is also helpful for other Ka-band spaceborne radars at low incidence angles to measure wind speed in the future.
Keywords	angle of incidence ; data collection ; empirical models ; radar ; surface water temperature ; wind speed
Language	English
Dates of publication	2022-0318
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2513863-7
ISSN	2072-4292
ISSN	2072-4292
DOI	10.3390/rs14061454
Database	NAL-Catalogue (AGRICOLA)

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