| 1. |
- Zhang, Lei, et al.
(författare)
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Discovery of a radio jet in the Cloverleaf quasar at z = 2.56
- 2023
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Ingår i: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 524:3, s. 3671-3682
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Tidskriftsartikel (refereegranskat)abstract
- The fast growth of supermassive black holes and their feedback to the host galaxies play an important role in regulating the evolution of galaxies, especially in the early Universe. However, due to cosmological dimming and the limited angular resolution of most observations, it is difficult to resolve the feedback from the active galactic nuclei (AGNs) to their host galaxies. Gravitational lensing, for its magnification, provides a powerful tool to spatially differentiate emission originating from AGN and host galaxy at high-redshifts. Here, we report a discovery of a jet-like radio structure in a strongly lensed starburst quasar, H1413+117 or Cloverleaf at redshift z = 2.56, based on observational data at optical, submillimetre, and radio wavelengths. With both parametric and non-parametric lens models and with reconstructed images in the source plane, we find a well-separated, kpc-scaled, single-sided radio jet located at projected to the north-west of the host galaxy in the source plane. This could indicate the co-existence of feedback from the AGN by both wind and jet in the Cloverleaf quasar.
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| 2. |
- Ding, Shaozhen, et al.
(författare)
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novoPathFinder: a webserver of designing novel-pathway with integrating GEM-model
- 2020
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Ingår i: Nucleic Acids Research. - : Oxford University Press (OUP). - 0305-1048 .- 1362-4962. ; 48:W1, s. W477-W487
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Tidskriftsartikel (refereegranskat)abstract
- To increase the number of value-added chemicals that can be produced by metabolic engineering and synthetic biology, constructing metabolic space with novel reactions/pathways is crucial. However, with the large number of reactions that existed in the metabolic space and complicated metabolisms within hosts, identifying novel pathways linking two molecules or heterologous pathways when engineering a host to produce a target molecule is an arduous task. Hence, we built a user-friendly web server, novoPathFinder, which has several features: (i) enumerate novel pathways between two specified molecules without considering hosts; (ii) construct heterologous pathways with known or putative reactions for producing target molecule within Escherichia coli or yeast without giving precursor; (iii) estimate novel pathways with considering several categories, including enzyme promiscuity, Synthetic Complex Score (SCScore) and LD50 of intermediates, overall stoichiometric conversions, pathway length, theoretical yields and thermodynamic feasibility. According to the results, novoPathFinder is more capable to recover experimentally validated pathways when comparing other rule-based web server tools. Besides, more efficient pathways with novel reactions could also be retrieved for further experimental exploration. novoPathFinder is available at http://design.rxnfinder.org/novopathfinder/.
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| 3. |
- Han, Mengying, et al.
(författare)
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ChemHub: a knowledgebase of functional chemicals for synthetic biology studies
- 2021
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Ingår i: Bioinformatics. - : Oxford University Press (OUP). - 1367-4803 .- 1367-4811 .- 1460-2059. ; 37:22, s. 4275-4276
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Tidskriftsartikel (refereegranskat)abstract
- The field of synthetic biology lacks a comprehensive knowledgebase for selecting synthetic target molecules according to their functions, economic applications and known biosynthetic pathways. We implemented ChemHub, a knowledgebase containing >90 000 chemicals and their functions, along with related biosynthesis information for these chemicals that was manually extracted from >600 000 published studies by more than 100 people over the past 10 years.
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| 4. |
- He, Dandan, et al.
(författare)
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Design of a Low Sidelobe Monopulse Array Antenna with Hybrid Feeding Structure
- 2019
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Ingår i: 2019 International Symposium on Antennas and Propagation, ISAP 2019 - Proceedings.
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Konferensbidrag (refereegranskat)abstract
- A low sidelobe monopulse array antenna with hybrid feeding structure is proposed. The array consists of four subarrays which employ 6 × 8 microstrip patch elements on the top layer. The feed network, which is hybrid feeding structure, is composed of 1-to-48 microstrip power dividers on the top layer, microstrip to groove gap waveguide transitions and a gap waveguide-based monopulse comparator. The microstrip unequal power dividers are compact to achieve unequal amplitude distribution. And the monopulse comparator based on groove gap waveguide has low insertion loss. Hence, the array antenna achieves low sidelobe and high efficiency. The array antenna is designed with size of 400 × 320 mm2. The simulated VSWR is less than 1.5 from 10.52 - 10.68 GHz, the simulated gain is 28.7 dBi at 10.6 GHz and the sidelobe level is less than -19 dB. The null depth in the difference pattern is less than -35 dB.
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| 5. |
- Wang, Enlin, et al.
(författare)
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Wideband High-Gain Circularly Polarized Antenna Array on Gap Waveguide for 5G applications
- 2019
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Ingår i: 2019 International Symposium on Antennas and Propagation, ISAP 2019 - Proceedings.
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Konferensbidrag (refereegranskat)abstract
- A wideband circularly polarized (CP) antenna array based on gap waveguide (GW) is presented in this paper. Firstly, a CP antenna based on septum polarizer is designed as the element for the array. Secondly, the feeding network is composed of T-junctions and realized by ridge gap waveguide (RGW). Then a 16 × 16 antenna array is built up by the elements. The novelty of this antenna is the combination of planar array and septum polarizer based on GW technology to achieve circularly polarization, high gain and high efficiency in wide bandwidth. The proposed array antenna achieves wide impedance bandwidth of 34.5% with the reflection coefficient below -10 dB, and a wide 3-dB axial ratio (AR) bandwidth of 26.5%. The simulated gain is higher than 32 dBic from 24.5 to 32.0 GHz, and the antenna efficiency is larger than 90%.
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| 6. |
- Zhang, Dachuan, et al.
(författare)
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FRCD: A comprehensive food risk component database with molecular scaffold, chemical diversity, toxicity, and biodegradability analysis
- 2020
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Ingår i: Food Chemistry. - : Elsevier BV. - 0308-8146 .- 1873-7072. ; 318
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Tidskriftsartikel (refereegranskat)abstract
- The presence of natural toxins, pesticide residues, and illegal additives in food products has been associated with a range of potential health hazards. However, no systematic database exists that comprehensively includes and integrates all research information on these compounds, and valuable information remains scattered across numerous databases and extensive literature reports. Thus, using natural language processing technology, we curated 12,018 food risk components from 152,737 literature reports, 12 authoritative databases, and numerous related regulatory documents. Data on molecular structures, physicochemical properties, chemical taxonomy, absorption, distribution, metabolism, excretion, toxicity properties, and physiological targets within the human body were integrated to afford the comprehensive food risk component database (FRCD, http://www.rxnfinder.org/frcd/). We also analyzed the molecular scaffold and chemical diversity, in addition to evaluating the toxicity and biodegradability of the food risk components. The FRCD could be considered a highly promising tool for future food safety studies.
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| 7. |
- Zhao, Yuxuan, et al.
(författare)
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Design of Wideband Dual-Circularly Polarized Endfire Antenna Array on Gap Waveguide
- 2019
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Ingår i: 13th European Conference on Antennas and Propagation, EuCAP 2019.
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Konferensbidrag (refereegranskat)abstract
- A wideband dual-circularly polarized (CP) linear antenna array is presented in this paper. Firstly, a dual-CP endfire antenna based on septum polarizer is designed as the element for the array. Secondly, the feeding network is realized by ridge gap waveguide. Then a 1×8 linear antenna array is built up by the elements. The proposed array antenna achieves wide impedance bandwidth of 44.6% with the reflection coefficient below -10 dB, the isolation between ports greater than 15 dB, and a wide 3-dB axial ratio (AR) bandwidth of 46.2%.
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