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Article ; Online: Design of Tri-Band Patch Antenna with Enhanced Bandwidth and Diversity Pattern for Indoor Wireless Communication

Min Gao / Xiaohu Zhao

Applied Sciences, Vol 12, Iss 7445, p

2022 Volume 7445

Abstract: A novel tri-band patch antenna with enhanced bandwidth and a diverse radiation pattern is presented in this study. An off-center probe is introduced to excite a conventional circular patch antenna, and the multi-frequency resonance modes of TM 01 , TM 02, ...

Abstract	A novel tri-band patch antenna with enhanced bandwidth and a diverse radiation pattern is presented in this study. An off-center probe is introduced to excite a conventional circular patch antenna, and the multi-frequency resonance modes of TM 01 , TM 02, and TM 03 with different radiation properties are obtained. Four metal cambered strips are distributed around the circular patch to adjust the impedance matching of the circular patch antenna. In order to widen the impedance bandwidth, a parasitic patch placed above the circular patch antenna is employed in this work. Then, a double-layer patch antenna is manufactured and tested to verify the accuracy of the theoretical analysis and simulated result. The measured results, which are basically consistent with the simulated results, show that the designed antenna can operate in three bandwidths of 1.79–1.81 GHz, 3.74–4.0 GHz, and 4.93–5.44 GHz, with radiation patterns of directional, omnidirectional, and three-beam pointing. The radiation efficiency higher than 85.6% and the maximum gain greater than 9.42 dBi suggest that the investigated antenna is suitable for multi-service scenarios in wireless communication.
Keywords	patch antenna ; enhanced bandwidth ; diverse radiation pattern ; multi-frequency resonance mode ; multi-service ; wireless communication ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	600
Language	English
Publishing date	2022-07-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Improving hepatocellular carcinoma diagnosis using an ensemble classification approach based on Harris Hawks Optimization

LiuRen Lin / YunKuan Liu / Min Gao / Amin Rezaeipanah

Heliyon, Vol 10, Iss 1, Pp e23497- (2024)

1481

Abstract: Hepato-Cellular Carcinoma (HCC) is the most common type of liver cancer that often occurs in people with chronic liver diseases such as cirrhosis. Although HCC is known as a fatal disease, early detection can lead to successful treatment and improve ... ...

Abstract	Hepato-Cellular Carcinoma (HCC) is the most common type of liver cancer that often occurs in people with chronic liver diseases such as cirrhosis. Although HCC is known as a fatal disease, early detection can lead to successful treatment and improve survival chances. In recent years, the development of computer recognition systems using machine learning approaches has been emphasized by researchers. The effective performance of these approaches for the diagnosis of HCC has been proven in a wide range of applications. With this motivation, this paper proposes a hybrid machine learning approach including effective feature selection and ensemble classification for HCC detection, which is developed based on the Harris Hawks Optimization (HHO) algorithm. The proposed ensemble classifier is based on the bagging technique and is configured based on the decision tree method. Meanwhile, HHO as an emerging meta-heuristic algorithm can select a subset of the most suitable features related to HCC for classification. In addition, the proposed method is equipped with several strategies for handling missing values and data normalization. The simulations are based on the HCC dataset collected by the Coimbra Hospital and University Center (CHUC). The results of the experiments prove the acceptable performance of the proposed method. Specifically, the proposed method with an accuracy of 97.13 % is superior in comparison with the equivalent methods such as LASSO and DTPSO.
Keywords	Medical diagnosis system ; Ensemble classification ; Feature selection ; HCC ; HHO ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
Subject code	006
Language	English
Publishing date	2024-01-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Effects of different hypoxia time on hematology and histomorphology of rats at 7 000 m altitude

Xiao-Min Gao / Qin Zhao

Journal of Hainan Medical University, Vol 27, Iss 17, Pp 5-

2021 Volume 9

Abstract: Objective: To observe the effects of different hypoxia time on hematology and histomorphology of rats by simulating the environment of 7000m altitude, and to provide the basis for the establishment of acute hypoxia model. Methods: 40 SD rats were ... ...

Abstract	Objective: To observe the effects of different hypoxia time on hematology and histomorphology of rats by simulating the environment of 7000m altitude, and to provide the basis for the establishment of acute hypoxia model. Methods: 40 SD rats were randomly divided into 0h hypoxia group, 6h, 12h, 24h, and 36h group. The hypoxia environment at 7000m was simulated by low-pressure oxygen chamber. The serum SOD, MDA, LDH biochemical indexes and the morphological changes of HE staining in heart, lung and brain tissues of rats were detected under different hypoxia time. Results: Compared with hypoxia group for 0h, the number of RBC in acute hypoxia group for 6h decreased and increased with the prolongation of hypoxia time, and the highest number of RBC. The WBC, LYMP, GRAN, HGB, HCT and RCT counts of the acute hypoxia group decreased for 6h, and the above indexes increased with the prolongation of hypoxia time. Compared with the 0h hypoxia group, SOD activity in serum decreased at different hypoxia time, and MDA content in the 24h and 36h hypoxia groups showed a fluctuating change and reached a peak at 12h hypoxia. The activity of LDH fluctuated, and reached the peak at 12hLDH after hypoxia, and then gradually decreased. He staining of the brain tissue of the heart and lung, which was close to normal after hypoxia for 36h, showed that with the prolongation of the hypoxia time, the damage degree of each organ increased continuously. Interstitial pneumonia or perivasculitis occurred in the lung, and perivascular edema and pulmonary interstitial widening were observed. Cardiac tissue showed obvious degeneration and necrosis of cardiomyocytes, lysis and necrosis of local myocardial interstitium and valve fibers.A large number of inflammatory cells could be seen infiltrating into the brain tissue in the CA2 CA3 DG region. The neuron cells were denatuated, the cell volume was reduced, basophilic was enhanced, and the nerve cells were triangular. The cells were pyknotic and basophilic, with a few transverse axis structures. ...
Keywords	blood routine examination ; hypoxia ; sod ; mda ; ldh ; Medicine ; R
Subject code	610
Language	English
Publishing date	2021-08-01T00:00:00Z
Publisher	Editorial Board of Journal of Hainan Medical University
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Hybrid photovoltaic-thermoelectric system using a novel spectral splitting solar concentrator

Alnajideen, Mohammad / Min, Gao

Elsevier Ltd Energy conversion and management. 2022 Jan. 01, v. 251

2022

Abstract: A hybrid photovoltaic-thermoelectric (PV-TE) system employing a novel solar concentrator is designed and constructed to demonstrate the feasibility of improving the overall efficiency of light-to-electricity conversion based on spectral splitting ... ...

Abstract	A hybrid photovoltaic-thermoelectric (PV-TE) system employing a novel solar concentrator is designed and constructed to demonstrate the feasibility of improving the overall efficiency of light-to-electricity conversion based on spectral splitting strategy. The concentrator consists of four rectangular dichroic mirrors arranged in a crossed V-trough configuration that reflects and concentrates the visible spectrum onto a photovoltaic cell in the centre while passes the infrared spectrum onto a thermal absorber to produce heat for a thermoelectric generator. The experimental results show that the overall efficiency of the hybrid PV-TE system is 16.9% compared to 15.9% of the same configuration except for using specular aluminium mirrors. An increase in the overall efficiency by 6.3% was achieved due to thermoelectric harvesting of the light energy in infrared spectrum. The results also show that a significant increase in the power output from 12.41 mW in the bare cell to 62.04 mW of the same cell in the concentrated system, indicating the advantages of using concentration system, particularly beneficial to high-cost solar cells, such as GaAs and GaInP.
Keywords	administrative management ; aluminum ; energy conversion ; heat ; hybrids ; solar collectors ; thermoelectric generators
Language	English
Dates of publication	2022-0101
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2000891-0
ISSN	0196-8904
ISSN	0196-8904
DOI	10.1016/j.enconman.2021.114981
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Investigation of the anisotropic mechanical response of layered shales

Min Gao / Bin Gong / Zhengzhao Liang / Shanpo Jia / Jiuqun Zou

Energy Science & Engineering, Vol 11, Iss 12, Pp 4737-

2023 Volume 4754

Abstract: Abstract Layered shales exist widely and are often encountered during shale gas development. However, the mechanical response of layered shales is significantly affected by the existence of beddings, resulting in the obvious anisotropy characteristics ... ...

Abstract	Abstract Layered shales exist widely and are often encountered during shale gas development. However, the mechanical response of layered shales is significantly affected by the existence of beddings, resulting in the obvious anisotropy characteristics regarding deformation, strength and failure mode. To clarify the underlying mechanisms of shale anisotropy that control the safety of engineering projects, the numerical simulation and theoretical analysis were conducted. The results show that with the growth of confining pressure, the compressive resistance of shales gradually increases, the shear fractures govern the instability and the anisotropy index decreases. Furthermore, several strength criteria for layered rock masses were summarized, and the modified Jaeger strength criterion was proposed by introducing the anisotropic parameter Rcθ. It can effectively reflect the failure modes and strength features of layered shales under triaxial conditions with a higher accuracy. Besides, the variation of cohesion and internal friction angle of layered shale samples was comprehensively analysed under the triaxial conditions. Clearly, as the inclination angle of bedding planes increases, the cohesion of layered shales first decreases, but then increases under triaxial compression, showing the ‘U’‐shaped changing trend. Additionally, the internal friction angle of layered shales gradually increases with the increase in the inclination of bedding planes.
Keywords	anisotropy ; failure criterion ; layered shales ; shale gas development ; triaxial compression ; Technology ; T ; Science ; Q
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	Wiley
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Effects on the yield and fiber quality components of Bt cotton inoculated with Azotobacter chroococcum under elevated CO2

Zhuo Li / Min Gao / Rujie Liu / Chunyan Chang / Feng Ge

PeerJ, Vol 11, p e

2023 Volume 15811

Abstract: Background The raising trend of cultivation of Bacillus thuringiensis (Bt)-transgenic cotton is faced with a new challenge what effects on the growth and yield of Bt cotton under elevated CO2. Methods Rhizobacteria is the significant biological regulator ...

Abstract	Background The raising trend of cultivation of Bacillus thuringiensis (Bt)-transgenic cotton is faced with a new challenge what effects on the growth and yield of Bt cotton under elevated CO2. Methods Rhizobacteria is the significant biological regulator to increase environmental suitability and ameliorate soil-nitrogen utilization efficiency of crops, especially Bt cotton. Pot-culture experiments investigated the effects on the yield and fiber quality components of Bt cotton (transgenic Line SCRC 37) inoculated with Azotobacter chroococcum (AC) under elevated CO2. Results The findings indicated that the inoculation of azotobacter significantly improved the yield and fiber quality components of Bt cotton, the elevated CO2 significantly increased the soil density of A. chroococcum and the partial yield indexes (as cottonweightper 20 bolls, lint yield per 20 bolls and boll number per plant), and non-significant decrease the fiber quality components of Bt cotton except uniform. Discussion Overall results obviously depicted that the inoculation of azotobacter and the elevated CO2 had positive effects on the yield and fiber quality components of Bt cotton. Presumably, azotobacter inoculation can be used to stimulate plant soil-nitrogen uptake and promote plant growth for Bt cotton under elevated CO2 in the future.
Keywords	Azotobacter chroococcum ; Bt cotton ; Elevated CO2 ; Fiber quality ; Yield ; Medicine ; R ; Biology (General) ; QH301-705.5
Subject code	630
Language	English
Publishing date	2023-08-01T00:00:00Z
Publisher	PeerJ Inc.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Generation of an induced pluripotent stem cell (iPSC) line SDQLCHi056-A from a patient with Nicolaides-Baraitser syndrome carrying a mutation in SMARCA2 gene

Xiaomeng Yang / Chunmei Yu / Min Gao / Yi Liu / Yuanxiang Liu

Stem Cell Research, Vol 73, Iss , Pp 103244- (2023)

2023

Abstract: Nicolaides-Baraitser syndrome (NCBRS) is characterized by severe mental retardation, early-onset seizures, short stature, dysmorphic facial features, and sparse hair. Heterozygous mutations in the SMARCA2 gene are the most common cause of NCBRS. Here, we ...

Abstract	Nicolaides-Baraitser syndrome (NCBRS) is characterized by severe mental retardation, early-onset seizures, short stature, dysmorphic facial features, and sparse hair. Heterozygous mutations in the SMARCA2 gene are the most common cause of NCBRS. Here, we generated an induced pluripotent stem cell line SDQLCHi056-A from a five-year-old girl with NCBRS caused by heterozygous mutation (c.3592 G > A, p.V1198M) in the SMARCA2 gene (OMIM#601358). The established iPSC line was validated by pluripotency markers, original gene mutation and demonstrated trilineage differentiation potential in vitro.
Keywords	Biology (General) ; QH301-705.5
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Cooperative Thermal-Electric Field Control of Infrared Modulation Using a Vanadium Dioxide Film-Based Modulator

Chang Lu / Fan Yang / Min Gao / Xinzhong Wang / Yuan Lin

ACS Omega, Vol 8, Iss 49, Pp 46399-

2023 Volume 46405

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Individual Maize Location and Height Estimation in Field from UAV-Borne LiDAR and RGB Images

Min Gao / Fengbao Yang / Hong Wei / Xiaoxia Liu

Remote Sensing, Vol 14, Iss 2292, p

2022 Volume 2292

Abstract: Crop height is an essential parameter used to monitor overall crop growth, forecast crop yield, and estimate crop biomass in precision agriculture. However, individual maize segmentation is the prerequisite for precision field monitoring, which is a ... ...

Abstract	Crop height is an essential parameter used to monitor overall crop growth, forecast crop yield, and estimate crop biomass in precision agriculture. However, individual maize segmentation is the prerequisite for precision field monitoring, which is a challenging task because the maize stalks are usually occluded by leaves between adjacent plants, especially when they grow up. In this study, we proposed a novel method that combined seedling detection and clustering algorithms to segment individual maize plants from UAV-borne LiDAR and RGB images. As seedlings emerged, the images collected by an RGB camera mounted on a UAV platform were processed and used to generate a digital orthophoto map. Based on this orthophoto, the location of each maize seedling was identified by extra-green detection and morphological filtering. A seed point set was then generated and used as input for the clustering algorithm. The fuzzy C-means clustering algorithm was used to segment individual maize plants. We computed the difference between the maximum elevation value of the LiDAR point cloud and the average elevation value of the bare digital terrain model (DTM) at each corresponding area for individual plant height estimation. The results revealed that our height estimation approach test on two cultivars produced the accuracy with R 2 greater than 0.95, with the mean square error (RMSE) of 4.55 cm, 3.04 cm, and 3.29 cm, as well as the mean absolute percentage error (MAPE) of 3.75%, 0.91%, and 0.98% at three different growth stages, respectively. Our approach, utilizing UAV-borne LiDAR and RGB cameras, demonstrated promising performance for estimating maize height and its field position.
Keywords	UAV ; LiDAR ; orthophoto ; maize ; height estimation ; seedling ; Science ; Q
Subject code	333
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Modified Cellulose with BINAP-Supported Rh as an Efficient Heterogeneous Catalyst for Asymmetric Hydrogenation

Cuiping Yu / Weilong Wu / Min Gao / Yu Liu

Catalysts, Vol 12, Iss 83, p

2022 Volume 83

Abstract: Asymmetric catalysis is the preferred method for the synthesis of pure chiral molecules in the fine chemical industry. Cellulose has long been sought as a support in enantioselective catalysis. Dialdehyde cellulose (DAC) is produced by the selective ... ...

Abstract	Asymmetric catalysis is the preferred method for the synthesis of pure chiral molecules in the fine chemical industry. Cellulose has long been sought as a support in enantioselective catalysis. Dialdehyde cellulose (DAC) is produced by the selective oxidation of cellulose and is used to bind 5,5′-diamino Binap by forming a Schiff base. Here, we report the synthesis of modified cellulose-supported Rh as a novel biomass-supported catalyst and the characterization of its morphology, composition, and thermal stability. DAC-BINAP-Rh was a very effective catalyst in the asymmetric hydrogenation of enamides and could be easily recycled. This work provides a novel supported catalyst that broadens the applications of cellulose in asymmetric catalysis.
Keywords	asymmetric hydrogenation ; cellulose ; BINAP ; heterogeneous catalysis ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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