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Wideband and high-gain BeiDou antenna with a sequential feed network for satellite tracking Research Article

Zhuolin DENG, Zhongyu TIAN, Chenhe DUAN, Pei XIAO, Zhu LIU, Gaosheng LI,Gaosheng7070@vip.163.com

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 10,   Pages 1471-1481 doi: 10.1631/FITEE.2200244

Abstract: BeiDou-3 navigation satellite system was officially opened in 2020.The antenna realizes through a , and the phase imbalance of the feed network from 1.05 to 1.80 GHz isThe manufactured antenna demonstrates a return loss of more than 13 dB and an axial ratio3 dB over theThe proposed antenna connected to a GNSS receiver has tracked 12 BeiDou satellites with ratios of GNSSSuch a high-performance antenna provides a basis for high-quality positioning services.

Keywords： BeiDou antenna     Wideband circularly polarized radiation     Four-port sequential feed network     Global navigation    

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Biosorption of Cd

Fengyu ZAN, Shouliang HUO, Beidou XI, Xiulan ZHAO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 1,   Pages 51-58 doi: 10.1007/s11783-011-0206-9

Abstract: The biosorption of Cd and Cu onto the immobilized ( ) was investigated in this study. Adsorption kinetics, isotherms and the effect of pH were studied. The results indicated that the biosorption of Cd and Cu on the immobilized was fast at initial stage and then became slow. The maximum biosorption of heavy metal ions on immobilized were observed at pH 4 for Cd and Cu . by the pseudo-second-order model described the sorption kinetic data well according to the high correlation coefficient ( ) obtained. The biosorption isotherm was fitted well by the Langmuir model, indicating possible mono-layer biosorption of Cd and Cu on the immobilized . Moreover, the immobilized after the sorption of Cd and Cu could be regenerated and reused.

Keywords： Saccharomyces cerevisiae (S. cerevisiae)     biosorption     heavy metals     immobilization     desorption    

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Innovation and development of BeiDou Navigation Satellite System (BDS) project management mode

Changfeng YANG

Frontiers of Engineering Management 2021, Volume 8, Issue 2,   Pages 312-320 doi: 10.1007/s42524-021-0155-3

Abstract: Zachary A. COLLIER, James H. LAMBERT. [J]. Front. Eng, 2020, 7(2): 172-181.Shanlin YANG, Jianmin WANG, Leyuan SHI, Yuejin TAN, Fei QIAO. [J]. Front. Eng, 2018, 5(4): 420-450.Yongkai ZHOU, Hongfeng CHAI. [J]. Front. Eng, 2017, 4(2): 127-137.Eric SCHEEPBOUWER, Douglas D. GRANSBERG, Carla Lopez del PUERTO. [J]. Front. Eng, 2017, 4(1): 49-57.Jonathan Jingsheng SHI, Saixing ZENG, Xiaohua MENG. [J]. Front. Eng, 2017, 4(1): 41-48.David A. Wyrick,Warren Myers. [J]. Front. Eng, 2016, 3(3): 203-205.Elizabeth A. Cudney,William L. Gillis. [J]. Front. Eng, 2016, 3(3): 224-230.Ling-ling Zhang,Ming-hui Zhao,Qiao Wang. [J]. Front. Eng, 2016, 3(2): 136-143.Chuan-jun Zheng,Hu Cheng. [J]. Front. Eng, 2015, 2(3): 304-310.Yong Shi. [J]. Front. Eng, 2015, 2(3): 293-303.Qiao Xiang. [J]. Front. Eng, 2015, 2(3): 249-260.Wen Ling. [J]. Front. Eng, 2015, 2(2): 173-177.Hong-feng Chai. [J]. Front. Eng, 2015, 2(2): 165-172.Hiral Shah,Walter Nowocin. [J]. Front. Eng, 2015, 2(1): 60-63.William L. Gillis,Elizabeth A. Cudney. [J]. Front. Eng, 2015, 2(1): 39-51.

Keywords： BDS     engineering management     systems engineering    

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Glogbal Services of BeiDou Navigation Satellite System: Risk Analysis and Countermeasures

Yang Jun

Strategic Study of CAE 2023, Volume 25, Issue 2,   Pages 13-21 doi: 10.15302/J-SSCAE-2023.02.002

Abstract:

After the BeiDou navigation satellite system (BDS) global services were

Keywords： BeiDou navigation satellite system     global services     risk analysis     risk response    

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Turnover and loss of nitrogenous compounds during composting of food wastes

YANG Yanmei, ZHANG Xiangfeng, YANG Zhifeng, XI Beidou, LIU Hongliang

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 2,   Pages 251-256 doi: 10.1007/s11783-008-0042-8

Abstract: Few people have so far explored into the research of the dynamics of various nitrogenous compounds (including water-soluble nitrogen) in composting of food wastes. This study aimed to investigate the solid-phase nitrogen, water-soluble nitrogen, nitrogen loss together with ammonia volatilization in the process of food wastes composting. A laboratory scale static aerobic reactor in the experiment was employed in the composting process of a synthetic food waste, in which sawdust was used as the litter amendment. In the experiment, oxygen was supplied by continuous forced ventilation for 15 days. The results have shown that the concentrations of total nitrogen and organic nitrogen decrease significantly in the composting process, whereas NH-N concentration increases together with little fluctuation in NO-N. After composting, the total content of the water-soluble nitrogen compounds in the compost greatly increased, the total nitrogen loss amounted to 50% of the initial nitrogen, mainly attributed to ammonia volatilization. 56.7% of the total ammonia volatilization occurred in the middle and late composting of the thermophilic stage. This suggested that the control at the middle and late composting of thermophilic stage is the key to nitrogen loss in the food waste compost.
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High Performance Electrically Small Huygens Rectennas Enable Wirelessly Powered Internet of Things Sensing Applications: A Review Review

Wei Lin, Richard W. Ziolkowski

Engineering 2022, Volume 11, Issue 4,   Pages 42-59 doi: 10.1016/j.eng.2021.08.025

Abstract: This paper reviews various rectenna miniaturization techniques such as meandered planar inverted-F antennarectennas; wirelessly powered IoT sensors based on these designs; and a dual-functional HLP rectenna and antenna

Keywords： Antenna     Array     Cardioid pattern     Electrically small antenna     Huygens dipole antenna     Internet of Things (    

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Antenna-in-package system integrated with meander line antenna based on LTCCtechnology

Gang DONG,Wei XIONG,Zhao-yao WU,Yin-tang YANG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 1,   Pages 67-73

Abstract:

We present an antenna-in-package system integrated with a meander line antenna based on low temperatureThe proposed system employs a meander line patch antenna, a packaging layer, and a laminated multi-chipThe meander line antenna achieved a bandwidth of 220 MHz with the center frequency at 2.4 GHz, a maximumThis antenna-in-package system integrated with a meander line antenna was fabricated and the experimental

Keywords： Antenna-in-package (AiP)     Meander line antenna     Multi-chip module (MCM)     Low temperature co-fired ceramic    

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Region-gridding recycling of bulk organic waste: Emerging views based on coordinated urban and rural development

Wenbing Tan, Dongyu Cui, Xiaohui Zhang, Beidou Xi

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 6, doi: 10.1007/s11783-020-1291-4

Abstract: Abstract Bulk organic waste (BOW) has a large output in China. The improper disposal of BOW will not only bring serious environmental pollution, but also cause waste of biomass resources. The viewpoint proposes a region-gridding recycling management system of BOW that highlights the coordinated development of environmental, agricultural and energy elements in urban and rural areas. The viewpoint aims to drive the upstream and downstream industrial chains of BOW treatments, avoid the repeated construction of resource facilities, guide the upgrading of resource-based technologies, promote the professionalization of farmers, and thus built the high-quality modern agricultural recycling industrial park based on system management.

Keywords： Bulk organic waste     Recycling     Urban-rural coordination     Management system    

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MIMO handset antenna for 5G/WLAN applications Correspondences

Yong CHENG, Jing LU, Bing-qing SHENG

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 182-187 doi: 10.1631/FITEE.1900478

Abstract: We propose a dual-module multiple-input multiple-output (MIMO) antenna for portable terminals.The operating bands of the handheld terminal antenna are 5G (3.4–3.8 GHz) and WLAN (5.150–5.925 GHz).Antenna elements of 5G and WLAN are spaced to reduce coupling between antenna elements in the same moduleThe return loss of all antenna elements is larger than 6 dB.of the low-frequency antenna is greater than 40%.

Keywords： Fifth-generation (5G)     Handset antenna     Multiple-input multiple-output (MIMO) antenna     Decouple    

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Integrated 60-GHz miniaturized wideband metasurface antenna in a GIPD process Research Articles

Hai-yang XIA, Jin-can HU, Tao ZHANG, Lian-ming LI, Fu-chun ZHENG

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 174-181 doi: 10.1631/FITEE.1900453

Abstract: We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.The proposed antenna is designed on a high dielectric constant glass substrate to achieve antenna miniaturizationwith the conventional rec-tangular patch in the TM10 mode, the radiation aperture of this proposed antennaUsing a probe-based antenna measurement setup, the antenna prototype is measured, demonstrating a 10-At 60 GHz, the antenna gain measured is about 5 dBi in the boresight direction with a compact radiation

Keywords： 60 GHz     Antenna-in-package (AiP)     Coplanar-waveguide-fed (CPW-fed) ring resonators     Glass integrated passivedevice (GIPD)     Metasurface antenna     Miniaturized antenna    

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Performance of a hybrid anaerobic-contact oxidation biofilm baffled reactor for the treatment of decentralized molasses wastewater

Minmin LIU,Ying ZHAO,Beidou XI,Li’an HOU,Xunfeng XIA

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 4,   Pages 598-606 doi: 10.1007/s11783-013-0576-2

Abstract: A novel hybrid anaerobic-contact oxidation biofilm baffled reactor (HAOBR) was developed to simultaneously remove nitrogenous and carbonaceous organic pollutants from decentralized molasses wastewater in the study. The study was based on the inoculation of anaerobic granule sludge in anaerobic compartments and the installation of combination filler in aerobic compartments. The performance of reactor system was studied regarding the hydraulic retention time (HRT), microbial characteristics and the gas water ratio (GWR). When the HRT was 24h and the GWR was 20:1, total ammonia and chemical oxygen demand (COD) of the effluent were reduced by 99% and 91.8%, respectively. The reactor performed stably for treating decentralized molasses wastewater. The good performance of the reactor can be attributed to the high resistance of COD and hydraulic shock loads. In addition, the high solid retention time of contact oxidation biofilm contributed to stable performance of the reactor.

Keywords： combination filler     contact oxidation biofilm     food wastewater     anaerobic baffled reactor    

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Advances in Fe(III) bioreduction and its application prospect for groundwater remediation: A review

Yu Jiang, Beidou Xi, Rui Li, Mingxiao Li, Zheng Xu, Yuning Yang, Shaobo Gao

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 6, doi: 10.1007/s11783-019-1173-9

Abstract: Microbial Fe(III) reduction is closely related to the fate of pollutants. Bioavailability of crystalline Fe(III) oxide is restricted due to thermodynamics. Amorphous Fe(III) (hydro)oxides are more bioavailable. Enrichment and incubation of Fe(III) reducing bacteria are significant. Microbial Fe(III) reduction is a significant driving force for the biogeochemical cycles of C, O, P, S, N, and dominates the natural bio-purification of contaminants in groundwater (e.g., petroleum hydrocarbons, chlorinated ethane, and chromium). In this review, the mechanisms and environmental significance of Fe(III) (hydro)oxides bioreduction are summarized. Compared with crystalline Fe(III) (hydro)oxides, amorphous Fe(III) (hydro)oxides are more bioavailable. Ligand and electron shuttle both play an important role in microbial Fe(III) reduction. The restrictive factors of Fe(III) (hydro)oxides bioreduction should be further investigated to reveal the characteristics and mechanisms of the process. It will improve the bioavailability of crystalline Fe(III) (hydro)oxides and accelerate the anaerobic oxidation efficiency of the reduction state pollutants. Furthermore, the approach to extract, culture, and incubate the functional Fe(III) reducing bacteria from actual complicated environment, and applying it to the bioremediation of organic, ammonia, and heavy metals contaminated groundwater will become a research topic in the future. There are a broad application prospects of Fe(III) (hydro)oxides bioreduction to groundwater bioremediation, which includes the in situ injection and permeable reactive barriers and the innovative Kariz wells system. The study provides an important reference for the treatment of reduced pollutants in contaminated groundwater.

Keywords： Microbial Fe(III) reduction     Mechanism     Groundwater contamination     Remediation    

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Antenna-in-Package (AiP) Technology

Yueping Zhang

Engineering 2022, Volume 11, Issue 4,   Pages 18-20 doi: 10.1016/j.eng.2021.08.012

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Antenna-in-package system integrated with meander line antenna based on LTCC technology

Gang Dong, Wei Xiong, Zhao-yao Wu, Yin-tang Yang,gdong@mail.xidian.edu.cn

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 1,   Pages 67-73 doi: 10.1631/FITEE.1500167

Abstract: We present an antenna-in-package system integrated with a based on technology.The proposed system employs a meander line patch antenna, a packaging layer, and a laminated for integrationThis antenna-in-package system integrated with a was fabricated and the experimental results agreed

Keywords： Antenna-in-package (AiP)     Meander line antenna     Multi-chip module (MCM)     Low temperature co-fired ceramic    

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Service Performance Enhancement Technologies for BeiDou Navigation Satellite System along the Belt and

Zhou Jianhua, Chen Junping, Zhang Jingyu

Strategic Study of CAE 2019, Volume 21, Issue 4,   Pages 69-75 doi: 10.15302/J-SSCAE-2019.04.005

Abstract:

To solve problems in globalization of the BeiDou Navigation Satellite

Keywords： satellite navigation，BeiDou Navigation Satellite System (BDS)，the Belt and Road，application and promotion    

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Title Author Date Type Operation

Wideband and high-gain BeiDou antenna with a sequential feed network for satellite tracking

Zhuolin DENG, Zhongyu TIAN, Chenhe DUAN, Pei XIAO, Zhu LIU, Gaosheng LI,Gaosheng7070@vip.163.com

Journal Article

Biosorption of Cd

Fengyu ZAN, Shouliang HUO, Beidou XI, Xiulan ZHAO

Journal Article

Innovation and development of BeiDou Navigation Satellite System (BDS) project management mode

Changfeng YANG

Journal Article

Glogbal Services of BeiDou Navigation Satellite System: Risk Analysis and Countermeasures

Yang Jun

Journal Article

Turnover and loss of nitrogenous compounds during composting of food wastes

YANG Yanmei, ZHANG Xiangfeng, YANG Zhifeng, XI Beidou, LIU Hongliang

Journal Article

High Performance Electrically Small Huygens Rectennas Enable Wirelessly Powered Internet of Things Sensing Applications: A Review

Wei Lin, Richard W. Ziolkowski

Journal Article

Antenna-in-package system integrated with meander line antenna based on LTCCtechnology

Gang DONG,Wei XIONG,Zhao-yao WU,Yin-tang YANG

Journal Article

Region-gridding recycling of bulk organic waste: Emerging views based on coordinated urban and rural development

Wenbing Tan, Dongyu Cui, Xiaohui Zhang, Beidou Xi

Journal Article

MIMO handset antenna for 5G/WLAN applications

Yong CHENG, Jing LU, Bing-qing SHENG

Journal Article

Integrated 60-GHz miniaturized wideband metasurface antenna in a GIPD process

Hai-yang XIA, Jin-can HU, Tao ZHANG, Lian-ming LI, Fu-chun ZHENG

Journal Article

Performance of a hybrid anaerobic-contact oxidation biofilm baffled reactor for the treatment of decentralized molasses wastewater

Minmin LIU,Ying ZHAO,Beidou XI,Li’an HOU,Xunfeng XIA

Journal Article

Advances in Fe(III) bioreduction and its application prospect for groundwater remediation: A review

Yu Jiang, Beidou Xi, Rui Li, Mingxiao Li, Zheng Xu, Yuning Yang, Shaobo Gao

Journal Article

Antenna-in-Package (AiP) Technology

Yueping Zhang

Journal Article

Antenna-in-package system integrated with meander line antenna based on LTCC technology

Gang Dong, Wei Xiong, Zhao-yao Wu, Yin-tang Yang,gdong@mail.xidian.edu.cn

Journal Article

Service Performance Enhancement Technologies for BeiDou Navigation Satellite System along the Belt and

Zhou Jianhua, Chen Junping, Zhang Jingyu

Journal Article