102 results on '"Jiachen Zhu"'
Search Results
2. Chromosome-level genome assembly of Chouioia cunea Yang, the parasitic wasp of the fall webworm
- Author
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Ziqi Wang, Xingzhou Ma, Jiachen Zhu, Boying Zheng, Ruizhong Yuan, Zhaohe Lu, Xiaohan Shu, Yu Fang, Shiji Tian, Qiuyu Qu, Xiqian Ye, Pu Tang, and Xuexin Chen
- Subjects
Science - Abstract
Abstract Chouioia cunea Yang 1989 is a parasitic wasp of many lepidopteran insects during their pupal stage, and has been successfully used to control pests such as the fall webworm Hyphantria cunea. Here we reported the chromosome-level genome of C. cunea by using short (MGI-SEQ), long (Oxford Nanopore), chromatin-linked (Hi-C) sequencing reads and transcriptomic data, representing the first chromosome-level genome of parasitic wasps of the family Eulophidae. The total assembly length is 171.99 Mb, containing 6 pesudo-chromosomes with a GC content of 36.89% and the scaffold/contig N50 length of 31.70/26.52 Mb. The BUSCO completeness of the assembly was estimated to be 98.7%. A total of 12,258 protein-coding genes (PCGs), 10,547 3′-UTRs, and 10,671 5′-UTRs were annotated. This high-quality genome is an important step toward a better understanding of the genomes of the Eulophidae (Chalcidoidea), and will serve as a valuable resource for analyses of phylogenetic relationships and the evolution of Hymenoptera.
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- 2023
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3. Enhancing SCR activity and anti-poisoning of MnOx/m-ZrO2 catalysts by metal doping
- Author
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Changsheng Qu, Shuang Lin, Danyang Zhao, Jiachen Zhu, Hao Zhou, and Dongyao Xu
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SCR ,H2O poisoning ,SO2 poisoning ,Co doping ,Sm doping ,Chemistry ,QD1-999 - Abstract
This study investigated the impact of metal doping on the DeNOx and anti-poisoning performance of MnOx/m-ZrO2. The DeNOx performance increases from 96% to nearly 100% by Co or Sm doping. However, the anti-poisoning performance was enhanced more by Sm doping, and the DeNOx performance remained at 90.97% after water and sulfur compound poisoning. The improved redox performance caused by the interaction between Sm and Mn resulted in more acidic sites that aid in the adsorption of NOx and NH3, and the presence of Sm effectively inhibits the formation of sulfate and ammonium sulfate, thus enhancing the DeNOx and anti-poisoning performance.
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- 2023
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4. Wear mechanism and life prediction of the ripper in a 9‐m‐diameter shield machine tunneling project of the Beijing new airport line in a sand‐pebble stratum
- Author
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Hua Jiang, Jiachen Zhu, Xiaoyan Zhang, Jinxun Zhang, Hongliang Li, and Lingfeng Meng
- Subjects
9‐m‐diameter shield ,long‐distance shield driving ,optimum driving distance ,sand‐pebble stratum ,tool wear ,wear prediction model ,Engineering geology. Rock mechanics. Soil mechanics. Underground construction ,TA703-712 - Abstract
Abstract Tool wear is a noteworthy problem in the process of shield tunneling, and the degree of wear varies with stratum. The sand‐pebble strata in Beijing are typically mechanically unstable. However, many subways are buried wholly or partially in sand‐pebble strata. Taking the Beijing New Airport line tunneling project as research background, this study evaluated the wear characteristics of the multiconfiguration rippers of a 9‐m‐diameter spoke‐type shield tunneling machine in a sand‐pebble stratum. The wear values of five ripper teeth and ripper flanks were analyzed based on field‐measured data from the Beijing New Airport line project. As the analytical results show, the wear value generally increases as the installation radius enlarges with the rise of cutting trace length. The wear of the 190‐rippers was divided into five categories: pedestal wear, ripper teeth collapse, uniform wear, ripper teeth falling off and ripper flank wear. Uniform wear of the ripper teeth and ripper flank wear were the two abrasion types of the 190‐rippers. The teeth of the 155‐rippers mostly maintained their cutting capacity under the protection of the 190‐rippers. A wear prediction model of linear fitting field data was developed for a 190‐ripper face to obtain the optimum shield driving distance in the sand‐pebble stratum. The average wear coefficients of the 190‐ripper before and after replacement matched well, being 0.045 and 0.066 mm/km, respectively. The results of this study provide a theoretical reference for tool wear prediction in shield construction under similar geological conditions.
- Published
- 2022
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5. Magnetic-induced dual-function tunable THz polarization conversion metamaterial based on Ni-Mn-Sn shape memory alloy films
- Author
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Xiaochuan Wang, Ruixian Liu, Kun Zhang, Rui Liu, Jiachen Zhu, Xiaohua Tian, and Changlong Tan
- Subjects
Optics. Light ,QC350-467 - Abstract
Due to the improvement in miniaturization and practicability of polarization conversion devices, the terahertz polarization control technology has been paid more and more attention. Nevertheless, a critical factor in restricting its development is short of dynamic and multifunctional materials. Ferromagnetic shape memory alloys (FSMAs) provide a novelty solution for tunable metamaterials because of their excellent recovery deformation, non-contact control, and fast response. Here, a new magnetic-induced tunable THz metamaterial is proposed, composed of Ni-Mn-Sn FSMAs resonator in strip structure, polyimide dielectric, and metal copper substrate. Numerical results reveal that the polarization converter can realize any in a broad band between 1.04 and 1.96 THz by applying different magnetic fields to adjust the elastic deformation of Ni-Mn-Sn. Notably, the device can also realize line circularly polarized light conversion in the range of 0.87–0.92 THz and 2.07–2.12 THz. Compared to the current state-of-the-art double functional polarization converter, the THz converter proposed in this work offers benefits in many respects, including the 61.3% relative bandwidth and high conversion efficiency. Our study provides an excellent strategy to develop actively tunable and multifunctional THz compact devices.
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- 2022
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6. Terahertz Metamaterial Absorber Based on Ni–Mn–Sn Ferromagnetic Shape Memory Alloy Films
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Rui Liu, Xiaochuan Wang, Jiachen Zhu, Xiaohua Tian, Wenbin Zhao, Changlong Tan, and Kun Zhang
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metamaterials ,shape memory alloy films ,Ni–Mn–Sn alloy films ,terahertz absorber ,dynamic tuning ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Terahertz absorbers have been extensively investigated by researchers due to their applications in thermophotovoltaic energy conversion and sensors, but a key factor limiting their development is the lack of vital and versatile materials. Ferromagnetic shape memory alloys (FSMAs) offer a novel remedy for tunable metamaterials due to their brilliant recovery of deformation, remote control, and transient response. In this study, we propose a tunable absorber based on magnetic field tuning, consisting of Ni–Mn–Sn ferro-magnetic shape memory alloy films in fractal geometry and optically excited Si plates. Numerical analysis shows that the proposed absorber has an absorbance bandwidth of 1.129 THz above 90% between 1.950 THz and 3.079 THz. The absorber geometry can be regulated by an external magnetic field, allowing dynamic switching between broadband and narrowband absorption modes, the latter showing an ultra-narrow bandwidth and a high-quality factor Q of ~25.8. The proposed terahertz absorber has several advantages over current state-of-the-art bifunctional absorbers, including its ultra-thin structure of 10.39 μm and an additional switching function. The absorption can be continuously tuned from 90% to 5% when the light-excited silicon plate is transferred from the insulator state to the metal state. This study presents a promising alternative strategy for developing actively regulated and versatile terahertz-integrated devices.
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- 2023
- Full Text
- View/download PDF
7. The Dual Functions of a Bracovirus C-Type Lectin in Caterpillar Immune Response Manipulation
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Xiaotong Wu, Zhiwei Wu, Xiqian Ye, Lan Pang, Yifeng Sheng, Zehua Wang, Yuenan Zhou, Jiachen Zhu, Rongmin Hu, Sicong Zhou, Jiani Chen, Zhizhi Wang, Min Shi, Jianhua Huang, and Xuexin Chen
- Subjects
bracovirus ,C-type lectin ,immunosuppression ,hemocytes proliferation ,agglutination ,hypoimmunity ,Immunologic diseases. Allergy ,RC581-607 - Abstract
Parasitoids are widespread in natural ecosystems and normally equipped with diverse viral factors to defeat host immune responses. On the other hand, parasitoids can enhance the antibacterial abilities and improve the hypoimmunity traits of parasitized hosts that may encounter pathogenic infections. These adaptive strategies guarantee the survival of parasitoid offspring, yet their underlying mechanisms are poorly understood. Here, we focused on Cotesia vestalis, an endoparasitoid of the diamondback moth Plutella xylostella, and found that C. vestalis parasitization decreases the number of host hemocytes, leading to disruption of the encapsulation reaction. We further found that one bracovirus C-type lectin gene, CvBV_28-1, is highly expressed in the hemocytes of parasitized hosts and participates in suppressing the proliferation rate of host hemocytes, which in turn reduces their population and represses the process of encapsulation. Moreover, CvBV_28-1 presents a classical bacterial clearance ability via the agglutination response in a Ca2+-dependent manner in response to gram-positive bacteria. Our study provides insights into the innovative strategy of a parasitoid-derived viral gene that has dual functions to manipulate host immunity for a successful parasitism.
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- 2022
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- View/download PDF
8. X-ray reflection spectroscopy with Kaluza–Klein black holes
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Jiachen Zhu, Askar B. Abdikamalov, Dimitry Ayzenberg, Mustapha Azreg-Aïnou, Cosimo Bambi, Mubasher Jamil, Sourabh Nampalliwar, Ashutosh Tripathi, and Menglei Zhou
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract Kaluza–Klein theory is a popular alternative theory of gravity, with both non-rotating and rotating black hole solutions known. This allows for the possibility that the theory could be observationally tested. We present a model which calculates the reflection spectrum of a black hole accretion disk system, where the black hole is described by a rotating solution of the Kaluza–Klein theory. We also use this model to analyze X-ray data from the stella-mass black hole in GRS 1915+105 and provide constraints on the free parameters of the Kaluza–Klein black holes.
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- 2020
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9. Bracoviruses recruit host integrases for their integration into caterpillar's genome.
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Zehua Wang, Xiqian Ye, Yuenan Zhou, Xiaotong Wu, Rongmin Hu, Jiachen Zhu, Ting Chen, Elisabeth Huguet, Min Shi, Jean-Michel Drezen, Jianhua Huang, and Xuexin Chen
- Subjects
Genetics ,QH426-470 - Abstract
Some DNA viruses infect host animals usually by integrating their DNAs into the host genome. However, the mechanisms for integration remain largely unknown. Here, we find that Cotesia vestalis bracovirus (CvBV), a polydnavirus of the parasitic wasp C. vestalis (Haliday), integrates its DNA circles into host Plutella xylostella (L.) genome by two distinct strategies, conservatively and randomly, through high-throughput sequencing analysis. We confirmed that the conservatively integrating circles contain an essential "8+5" nucleotides motif which is required for integration. Then we find CvBV circles are integrated into the caterpillar's genome in three temporal patterns, the early, mid and late stage-integration. We further identify that three CvBV-encoded integrases are responsible for some, but not all of the virus circle integrations, indeed they mainly participate in the processes of early stage-integration. Strikingly, we find two P. xylostella retroviral integrases (PxIN1 and PxIN2) are highly induced upon wasp parasitism, and PxIN1 is crucial for integration of some other early-integrated CvBV circles, such as CvBV_04, CvBV_12 and CvBV_24, while PxIN2 is important for integration of a late-integrated CvBV circle, CvBV_21. Our data uncover a novel mechanism in which CvBV integrates into the infected host genome, not only by utilizing its own integrases, but also by recruiting host enzymes. These findings will strongly deepen our understanding of how bracoviruses regulate and integrate into their hosts.
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- 2021
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10. Membrane Applications in Autologous Cell Therapy
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Risto Martin, Rui Lei, Yida Zeng, Jiachen Zhu, Hong Chang, Hua Ye, and Zhanfeng Cui
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autologous cell therapy ,bioreactor ,hollow fibre membrane bioreactor (HFBR) ,cell culture ,Chemical technology ,TP1-1185 ,Chemical engineering ,TP155-156 - Abstract
Stem cell and cell therapies, particularly autologous cell therapies, are becoming a common practice. However, in order for these technologies to achieve wide-scale clinical application, the prohibitively high cost associated with these therapies must be addressed through creative engineering. Membranes can be a disruptive technology to reshape the bioprocessing and manufacture of cellular products and significantly reduce the cost of autologous cell therapies. Examples of successful membrane applications include expansions of CAR-T cells, various human stem cells, and production of extracellular vesicles (EVs) using hollow fibre membrane bioreactors. Novel membranes with tailored functions and surface properties and novel membrane modules that can accommodate the changing needs for surface area and transport properties are to be developed to fulfil this key role.
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- 2022
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11. Organic–Inorganic Modification of Magnesium Borate Rod by Layered Double Hydroxide and 3-Aminopropyltriethoxysilane and Its Effect on the Properties of Epoxy Resin
- Author
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Sai Zou, Li Dang, Ping Li, Jiachen Zhu, Shengjie Lan, and Donghai Zhu
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epoxy resin ,magnesium borate rod ,layered double hydroxide ,composites ,flame retardant ,Organic chemistry ,QD241-441 - Abstract
To alleviate the safety hazards associated with the use of epoxy resin (EP), a multifunctional filler was designed. This study firstly combines the superior mechanical properties of magnesium borate rods (MBR) with the excellent smoke suppression and flame-retardant characteristics of layered double hydroxide (LDH). H2PO4− intercalated LDH (LDHP) was coated on the MBR surface to obtain inorganic composite particles MBR@LDHP. Subsequently, MBR@LDHP was modified with 3-aminopropyltriethoxysilane (APES) to obtain organic-inorganic composite particles MBR@LDHP-APES. Eventually, the hybrid particles were added to EP to prepare the composite materials. Thereafter, the morphology, composition, and structure of MBR@LDHP-APES were characterized utilizing scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and X-ray diffraction (XRD). The results indicated the successful preparation of MBR@LDHP-APES, after which we investigated the effects of MBR@LDHP-APES on the smoke suppression, flame retardancy, and mechanical characteristics of EP. As observed, the EP composites containing 7.5 wt% MBR@LDHP-APES exhibited superior smoke suppression and flame retardancy abilities. The limiting oxygen index reached 33.5%, which is 36.73% greater than pure EP, and the lowest values of total heat and smoke release were observed for the composite materials. In addition, the mechanical properties test revealed that MBR@LDHP-APES considerably enhanced the tensile strength as well as the flexural strength of the composites. Furthermore, mechanistic studies suggested that the barrier effect of MBR, endothermic decomposition of LDHP, and the synergistic effect of LDHP and APES contributed essentially to the smoke suppression and flame-retardant properties of the material. The findings of this research point to a potential method for enhancing the EP’s ability to suppress smoke and flames while enhancing its mechanical properties.
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- 2022
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12. The complete mitochondrial genome of Trichopria drosophilae (Hymenoptera: Diapriidae)
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Zhang Xian, Zhongqiu Pan, Jiani Chen, Jiachen Zhu, Sicong Zhou, Lan Pang, Min Shi, Xuexin Chen, and Jianhua Huang
- Subjects
trichopria drosophilae ,parasitoid ,mitochondrial genome ,Genetics ,QH426-470 - Abstract
Trichopria drosophilae (Hymenoptera: Diapriidae) is an important pupal endoparasitoid of Drosophila species, which has been found to be an ideal biocontrol agent to D. suzukii. In this study, the complete mitochondrial genome of T. drosophilae (GeneBank accession number: MN966974) was sequenced using Illumina HiSeq X Ten system. The mitochondrial genome is 16,375 bp long and comprises 13 protein-coding genes, 22 transfer RNA genes and 2 ribosomal RNA genes. Among them, 24 genes are in majority strand, while the others are in minority strand. The nucleotide composition of A, G, C, T is 44.9%, 6.4%, 5.6%, 43.2% respectively. We also performed a phylogenetic analysis with other known mitochondrial genomes within four families that have been shown to parasitize drosophilid species. The result shows that T. drosophilae is closely related to Ismarus sp.
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- 2020
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13. The complete mitochondrial genome of Asobara japonica (Hymenoptera: Braconidae)
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Xian Zhang, Chaoqun Li, Zhongqiu Pan, Jiachen Zhu, Zhizhi Wang, Min Shi, Xuexin Chen, and Jianhua Huang
- Subjects
asobara japonica ,parasitoid ,mitochondrial genome ,Genetics ,QH426-470 - Abstract
Asobara japonica is an important larval-pupal endoparasitoid of Drosophila melanogaster and some other fruit fly species, such as Drosophila suzukii, and is an invasive and economic pest. In this study, the complete mitochondrial genome of A. japonica (GeneBank accession number: MN882556) was sequenced using Illumina HiSeq X Ten system. The mitochondrial genome is 15,519 bp long and comprises 13 protein-coding genes, 22 transfer RNA genes, 2 ribosomal RNA genes, of which 12 genes are in majority stand, and the remaining 25 genes are in minority strand. The nucleotide composition of A, G, C, T is 40.6, 8.2, 6.0, and 45.3% respectively. We also performed a phylogenetic analysis with other known mitochondrial genomes of Braconidae. The results show that A. japonica is closely related to Diachasmimorpha longicaudata.
- Published
- 2020
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14. Multifunctional and dynamically tunable terahertz metamaterials based on TiNi shape memory alloy films with a simple design
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Changlong Tan, Juan Liu, Xiaohua Tian, Jiachen Zhu, and Kun Zhang
- Subjects
Metamaterials ,Terahertz ,Shape memory alloy films ,Martensitic transformation ,TiNi alloy films ,Physics ,QC1-999 - Abstract
In the terahertz (THz) fields, a crucial point of restricting its development and application is the lack of dynamic and multifunctional materials. In this work, NiTi films are innovatively introduced into the design, and multifunctional and dynamically tunable terahertz metamaterials are proposed. The influence and mechanism of the shape deformation and conductivity changes before and after martensitic transformation on the electromagnetic response are systematically investigated and revealed. Based on the novel NiTi metamaterials, inductance-capacitance (LC) resonance and dipole resonance are used simultaneously for the terahertz filter, and an excellent dual-band filter is obtained. The frequencies of both LC and dipolar resonances can be dynamically tuned to the desired operating frequencies by driving the martensitic transformation. And the resonant frequency of the band-stop filter achieves a dynamic modulation range up to 0.56 THz. Furthermore, the results also show that when martensitic transformation occurs, the terahertz wave transmission can be tuned from 0.78 to 0.04 at 0.47 THz. Moreover, as an excellent switch, the ON state transmittance is one order of magnitude higher than the OFF-state transmittance. In brief, this study provides a new perspective and ideas for developing a tunable dual-band terahertz filter and thermal-induced terahertz switch.
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- 2021
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15. Dynamically tunable and polarization-insensitive dual-band terahertz metamaterial absorber based on TiNi shape memory alloy films
- Author
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Kun Zhang, Tianyou Ma, Juan Liu, Xiaohua Tian, Jiachen Zhu, and Changlong Tan
- Subjects
Metamaterials ,Shape memory alloy films ,Martensitic transformation ,TiNi alloy films ,Terahertz metamaterial absorber ,Physics ,QC1-999 - Abstract
A crucial point of restricting its development and application is the lack of dynamically tunable devices in the terahertz fields. In this work, shape memory alloys (SMAs) are innovatively introduced into the design of THz metamaterials absorber (MMA). An optimized structure design is proposed, and the MMA exhibits the perfect properties of dynamical tuning, polarization insensitivity, and dual-band absorption. In detail, two discrete resonance peaks can be detected, and their corresponding absorbance is up to 98.8% at 0.9982 THz and 96.8% at 1.5328 THz, respectively. The effect of structural parameters on the absorption performance is investigated further to reveal these two peaks' formation mechanism. Based on the martensitic transformation of TiNi alloy, the absorption peaks can be dynamically tuned to the desired operating frequencies through varying the external thermal field. Meanwhile, the absorber is polarization-insensitive when it is incident vertically due to the symmetry of the structure, and the excellent absorption performance can be maintained over a wide angular range of incidence. On account of the ultra-narrow bandwidth and the high-quality factor Q, we discuss the sensing ability of peak B. It can be found that peak B is sensitive to a minor change of the refractive index n of surrounding media and shows sensing ability. Through theoretical analysis, the sensitivity of the sensor is up to 0.88 THz/RIU, and the sensor’s figure of merit can be up to 92.63. This work proposes a novel idea of the design of various SMAs-based dynamically tunable terahertz optical devices.
- Published
- 2021
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16. Aerodynamic characteristics of hypersonic airfoils based on jet flow control technology
- Author
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Jiachen Zhu, Zhiwei Shi, Junquan Fu, and Jie Chen
- Subjects
Physics ,QC1-999 - Abstract
Hypersonic aircraft represent an important area of aerospace development. Raising the aircraft lift-to-drag ratio, improving the efficiency of attitude control, and optimizing aerodynamic performance are important goals. Active flow control technology can improve the aerodynamic performance of the aircraft while optimizing its control attitude. In the field of low speed, subsonic speed, and supersonic speed, many experiments and numerical simulations have been carried out to verify the excellent auxiliary or control effects of active flow control technology on aircraft. In this paper, a two-dimensional hypersonic airfoil is selected to analyze the feasibility and control effect of jet flow control technology under hypersonic inflow, and a flow control scheme is designed to make the jet eject from the wing surface. First, the influence of different jet excitation parameters on the scheme is explored through numerical simulation, mainly including the Mach number, the jet location, the jet angle, and the change with the angle of attack. After that, typical excitation states of numerical simulation are selected for hypersonic wind tunnel experiment verification, whose results are in good agreement with those of the numerical simulation. The results prove that, under the condition of high altitude and low pressure, if jet excitation is applied on the surface of the hypersonic airfoil, a local high pressure area will be formed in front of the excitation port, and the differential pressure between upper and lower wings will be changed. It can optimize the aerodynamic characteristics, increase or reduce lift, produce pitching moment simultaneously, enhance the efficiency of the rudder surface, and assist attitude control.
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- 2021
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17. Eliciting Offensive Responses from Large Language Models: A Genetic Algorithm Approach.
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Zheng Chen, Jiachen Zhu 0003, and Anlong Chen
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- 2024
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18. M-scan: A Multi-Scenario Causal-driven Adaptive Network for Recommendation.
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Jiachen Zhu 0001, Yichao Wang 0002, Jianghao Lin, Jiarui Qin, Ruiming Tang, Weinan Zhang 0001, and Yong Yu 0001
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- 2024
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19. Microstructure, Texture Evolution and Magnetic Properties of Fe-6.5 wt. % Si and Fe-6.5 wt. % Si-0.5 wt. % Cu Alloys during Rolling and Annealing Treatment
- Author
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Zhaoyang Cheng, Jing Liu, Jiachen Zhu, Zhidong Xiang, Juan Jia, and Yunjie Bi
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Fe-6.5 wt. % Si alloy ,alloying ,microstructure ,texture evolution ,magnetic properties ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Sheets of Fe-6.5 wt. % Si and Fe-6.5 wt. % Si-0.5 wt. % Cu with the thickness of 0.3 mm have been produced by hot and warm rolling. The microstructure, texture evolution and magnetic properties of the two alloys were investigated. It was found that the addition of 0.5 wt. % Cu promoted the formation of shear bands during warm rolling, and enhanced the {110} texture at surface layer and {111} texture in the middle layer. After annealing treatment, a strong η fiber texture with a peak at {110} was formed in the Fe-6.5 wt. % Si-0.5 wt. % Cu sample, while the Fe-6.5 wt. % Si sample was characterized by complex γ, η and λ fibers. The formation of dominating η fiber in the annealed Fe-6.5 wt. % Si-0.5 wt. % Cu sample is attributed to the shear bands formed in {111} oriented grains. These shear bands in {111} oriented grains acted as the nucleation sites of η oriented grains and promoted the growth of Goss oriented grains. The presence of strong η fiber with a peak at Goss in Fe-6.5 wt. % Si-0.5 wt. % Cu sample was the cause for the higher magnetic induction observed for this sample than for the Fe-6.5 wt. % Si sample.
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- 2018
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20. Learning to Distinguish Multi-User Coupling Behaviors for TV Recommendation.
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Jiarui Qin, Jiachen Zhu 0001, Yankai Liu, Junchao Gao, Jianjie Ying, Chaoxiong Liu, Ding Wang, Junlan Feng, Chao Deng, Xiaozheng Wang, Jian Jiang, Cong Liu, Yong Yu 0001, Haitao Zeng, and Weinan Zhang 0001
- Published
- 2023
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21. RankFlow: Joint Optimization of Multi-Stage Cascade Ranking Systems as Flows.
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Jiarui Qin, Jiachen Zhu 0001, Bo Chen 0023, Zhirong Liu, Weiwen Liu, Ruiming Tang, Rui Zhang 0003, Yong Yu 0001, and Weinan Zhang 0001
- Published
- 2022
- Full Text
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22. Detecting Data Leakage in DNS Traffic based on Time Series Anomaly Detection.
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Futai Zou, Yundong Ren, Jiachen Zhu 0004, and Junhua Tang
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- 2021
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23. Detecting Malicious Domains Using Modified SVM Model.
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Jiachen Zhu 0004 and Futai Zou
- Published
- 2019
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24. Restaurant Health Inspections and Crime Statistics Predict the Real Estate Market in New York City.
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Rafael M. Moraes, Anasse Bari, and Jiachen Zhu
- Published
- 2019
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25. Effects of magnesium hydroxide morphology on Pb(ii) removal from aqueous solutions.
- Author
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Donghai Zhu, Jiachen Zhu, Ping Li, and Shengjie Lan
- Published
- 2024
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26. Terahertz Metamaterial Absorber Based on Ni–Mn–Sn Ferromagnetic Shape Memory Alloy Films
- Author
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Zhang, Rui Liu, Xiaochuan Wang, Jiachen Zhu, Xiaohua Tian, Wenbin Zhao, Changlong Tan, and Kun
- Subjects
metamaterials ,shape memory alloy films ,Ni–Mn–Sn alloy films ,terahertz absorber ,dynamic tuning - Abstract
Terahertz absorbers have been extensively investigated by researchers due to their applications in thermophotovoltaic energy conversion and sensors, but a key factor limiting their development is the lack of vital and versatile materials. Ferromagnetic shape memory alloys (FSMAs) offer a novel remedy for tunable metamaterials due to their brilliant recovery of deformation, remote control, and transient response. In this study, we propose a tunable absorber based on magnetic field tuning, consisting of Ni–Mn–Sn ferro-magnetic shape memory alloy films in fractal geometry and optically excited Si plates. Numerical analysis shows that the proposed absorber has an absorbance bandwidth of 1.129 THz above 90% between 1.950 THz and 3.079 THz. The absorber geometry can be regulated by an external magnetic field, allowing dynamic switching between broadband and narrowband absorption modes, the latter showing an ultra-narrow bandwidth and a high-quality factor Q of ~25.8. The proposed terahertz absorber has several advantages over current state-of-the-art bifunctional absorbers, including its ultra-thin structure of 10.39 μm and an additional switching function. The absorption can be continuously tuned from 90% to 5% when the light-excited silicon plate is transferred from the insulator state to the metal state. This study presents a promising alternative strategy for developing actively regulated and versatile terahertz-integrated devices.
- Published
- 2023
- Full Text
- View/download PDF
27. Imaging of cardiac electrical excitation conduction.
- Author
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Dafang Zhou, Shiqin Jiang, Jiachen Zhu, Chen Zhao 0004, Yurui Yan, Dietrich H. W. Grönemeyer, and Peter Van Leeuwen
- Published
- 2015
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28. NSCLC Vaccines: Mechanism, Efficacy and Side Effects
- Author
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Jiachen Zhu
- Abstract
Lung cancer is the most prevalent cancer, with more than 2.2 million lung cancer diagnosed cases and more than 1.79 million deaths worldwide in 2020, accounting for approximately 18% of the total cancer deaths, of which non-small cell lung cancer accounts for the majority. Patients with stage I-II NSCLC can be treated by surgery, but most patients have missed the period of radical surgery when they are diagnosed. Cancer vaccines as a type of immunotherapy have low side effects and strong specificity against tumor cells. Cancer vaccines can be broadly classified into three categories: peptide vaccines, cell vaccines, and nucleic acid-based vaccines. Protein/peptide vaccines continue to make up a large percentage of all vaccination types. The main target at the moment is a tumor-associated antigen. The amount of research being done on cell vaccines, particularly DC vaccines, is expanding. NSCLC nucleic acid vaccines, particularly DNA vaccines, are in short supply.
- Published
- 2022
29. Gender Differences in Diagnostic Radiology Practice: An Observational Study
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Carlos Schorlemmer, Timo Krings, Robert van Tuijl, Ida Anderman, Jiachen Zhu, Sapna Rawal, Paula Alcaide-Leon, and Guan Wang
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Male ,medicine.medical_specialty ,Scope of practice ,Teleradiology ,business.industry ,Second opinion ,Odds ratio ,Rate ratio ,Subspecialty ,Confidence interval ,Odds ,Radiography ,Sex Factors ,Radiologists ,Humans ,Medicine ,Female ,Radiology, Nuclear Medicine and imaging ,Observational study ,Radiology ,business - Abstract
Purpose To investigate gender differences in diagnostic radiology practice, specifically, the differences in scope of practice, the frequency of consultations to other colleagues, and the error rates. Material and methods A retrospective observational study was performed including radiologists working for a European teleradiology provider between 2013 and 2019. Main outcome measures included the adjusted odds ratio of female gender for reporting cases in more than one subspecialty, the adjusted incidence rate ratio (IRR) of female gender for the count of second opinion requests to other colleagues, and the adjusted IRR of female gender for the count of radiologic errors. Multivariable adjustment was performed for covariates associated with experience, type of cases reported, part- or full-time employment, and reporting speed. Results A total of 213 radiologists (36% female) were included in the analysis of gender differences in scope of practice. Female gender was associated with a lower odds of reporting cases in more than one subspecialty with an odds ratio of 0.46 (95% confidence interval, 0.22-0.96). A total of 204 radiologists (36% female) were included in the analysis of gender differences in the count of second opinion requests to colleagues. There was a trend toward an association between female gender and higher odds of requesting a second opinion with an adjusted IRR of 1.6 compared with male gender but it was not statistically significant (P = .08). A total of 199 radiologists were included (37% female) in the analysis of gender differences in the number of radiologic errors. Female gender was associated with a decrease in the odds of error with an IRR of 0.8 (95% confidence interval, 0.64-0.995). Conclusions Female radiologists tend to have a narrower scope of practice and make fewer mistakes than their male counterparts, even after detailed adjustment for factors that might explain gender differences in scope of practice and errors.
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- 2022
30. Utilization of compressed sensing accelerated, low velocity encoded, isotropic resolution phase contrast magnetic resonance angiography for SEEG electrode implantation
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Qiangqiang Liu, Zengping Lin, Yiwen Shen, Jiachen Zhu, Jian Song, Chencheng Zhang, Yong Lu, and Jiwen Xu
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Surgery ,Neurology (clinical) - Published
- 2023
31. A Combinational Optimization Algorithm for Inverse Kinematics of an 8-DOF Redundant Manipulators
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Yu Guo, Hongchuan Zuo, Xuechan Chen, Jiachen Zhu, Chaoyang Ji, and Ziming Chen
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- 2023
32. Research on Optimization of Equipment Performance Index Based on Rough Set Theory
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Wei Hou, Guojun Wei, Jin Sun, Jiachen Zhu, and Nengbo He
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- 2022
33. RankFlow
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Jiarui Qin, Jiachen Zhu, Bo Chen, Zhirong Liu, Weiwen Liu, Ruiming Tang, Rui Zhang, Yong Yu, and Weinan Zhang
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- 2022
34. An artificial LAMA2-GelMA hydrogel microenvironment for the development of pancreatic endocrine progenitors
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Yan Huang, Yang Xu, Jiachen Zhu, Jian Wan, Yicheng Xiong, Zhaoyan Jiang, Shajun Zhu, Qingsong Guo, Yuxi Li, Yuhua Lu, Bin Yu, Yibing Guo, Zhiwei Wang, and Yumin Yang
- Subjects
Homeodomain Proteins ,Integrins ,Biophysics ,Mice, Nude ,Bioengineering ,Hydrogels ,Cell Differentiation ,Biomaterials ,Mice ,Mechanics of Materials ,Ceramics and Composites ,Humans ,Animals ,Gelatin ,Methacrylates ,Pancreas - Abstract
The biomimetic pancreatic microenvironment improves the differentiation efficiency and function of human embryonic stem cell-derived β-cells (SC-β cells). Thus, a laminin subunit alpha 2-gelatin methacrylate (LAMA2-GelMA) hybrid hydrogel as a bionics carrier for the formation and maturation of endocrine lineage was developed in our research, based on pancreas proteomics analysis of postnatal mice. Pancreatic endocrine cells cultured on the hybrid hydrogel in vitro, which was composed of 0.5 μg/mL LAMA2 protein and 4% GelMA, the expression of transcription factors (TFs), including NKX6.1, NKX6.2, and NEUROD1 were upregulated. Single-cell transcriptomics was performed after LAMA2 knockdown during the early differentiation of pancreatic progenitor (PP) cells, a marked decrease in the forkhead box protein A2 (FOXA2
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- 2022
35. Optical design of geostationary wide swath imaging spectrometer with freeform surfaces
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Wang Huiquan, Zhu Jiachen Zhu Jiachen, Chen Xinhua Chen Xinhua, and Shen Weimin Shen Weimin
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- 2022
36. Optical design of geostationary wide swath imaging spectrometer with freeform surfaces
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Huiquan, Wang, primary, Zhu Jiachen, Zhu Jiachen, additional, Chen Xinhua, Chen Xinhua, additional, and Shen Weimin, Shen Weimin, additional
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- 2022
- Full Text
- View/download PDF
37. The Mechanical Properties of Ni-Mn-Sn Alloy Thin Films with Fe Doping
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Changlong Tan, Lu Yu, Jiachen Zhu, and Chuntian Chen
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010302 applied physics ,Materials science ,Doping ,Alloy ,02 engineering and technology ,Nanoindentation ,engineering.material ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,Control and Systems Engineering ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,engineering ,Electrical and Electronic Engineering ,Thin film ,Composite material ,0210 nano-technology - Abstract
The mechanical properties of Ni-Mn-Sn alloy thin films with excellent magnetic properties are poor, which limit practical application seriously. Therefore, the effect of Fe doping on the mechanical...
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- 2020
38. Yaw control of a flying-wing unmanned aerial vehicle based on reverse jet control
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Jie Chen, Jiachen Zhu, Zhiwei Shi, Yizhang Dong, Junquan Fu, and Sun Quanbing
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020301 aerospace & aeronautics ,Jet (fluid) ,Heading (navigation) ,Wing ,Computer simulation ,Computer science ,Mechanical Engineering ,Control (management) ,Aerospace Engineering ,02 engineering and technology ,01 natural sciences ,010305 fluids & plasmas ,Computer Science::Robotics ,Attitude control ,Flow separation ,0203 mechanical engineering ,Control theory ,0103 physical sciences ,Yaw control - Abstract
Due to its layout, there are difficulties in realizing heading attitude control of a flying-wing unmanned aerial vehicle. In this paper, a reverse jet control scheme has been designed: (1) to replace the resistance rudders that are used for the yaw control of a conventional flying-wing unmanned aerial vehicle, (2) to assist and optimize heading attitude control, eliminate the adverse effects of the control surface and enhance stealth performance, and (3) to promote the use of rudderless flight for flying-wing unmanned aerial vehicles. To explore the control mechanism and the flow field of the reverse jet scheme, three-dimensional numerical simulations and low-speed wind tunnel experiments were carried out. First, the numerical simulations evaluated the feasibility and effectiveness of the reverse jet control scheme and explored and optimized the excitation parameters for the scheme. Then the forces were measured in a wind tunnel, and particle image velocimetry experiments were carried out. A reverse jet actuator was independently designed to verify the results of the numerical simulation. The results show that when the reverse jet excitation is applied, the jet obstructs the mainstream, destroys the flow field at the excitation position, and causes early separation of the flow, which increases the pressure drag on the wings and produces a control effect. The control effect mainly depends on the separation degree of the leeward surface. The larger the jet momentum coefficient is, the smaller the jet angle is, and the closer the excitation position is to the leading edge, the greater the separation degree of the leeward surface is, the better the heading attitude control effect is.
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- 2020
39. Preparation and Biocompatibility Study of Contrast-Enhanced Hernia Mesh Material
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Xuzhong Ding, Jiachen Zhu, Anning Liu, Qiyang Guo, Qing Cao, Yu Xu, Ye Hua, Yumin Yang, and Peng Li
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Hernia ,Materials Testing ,Biomedical Engineering ,Medicine (miscellaneous) ,Animals ,Humans ,Original Article ,Prostheses and Implants ,Surgical Mesh ,Polypropylenes - Abstract
BACKGROUND: Meshes play a crucial role in hernia repair. However, the displacement of mesh inevitably leads to various associated complications. This process is difficult to be traced by conventional imaging means. The purpose of this study is to create a contrast-enhanced material with high-density property that can be detected by computed tomography (CT). METHODS: The contrast-enhanced monofilament was manufactured from barium sulfate nanoparticles and medical polypropylene (PP/Ba). To characterize the composite, stress tensile tests and scanning electron microscopy (SEM) was performed. Toxicity and biocompatibility of PP/Ba materials was verified by in vitro cellular assays. Meanwhile, the inflammatory response was tested by protein adsorption assay. In addition, an animal model was established to demonstrate the long-term radiographic effect of the composite material in vivo. Subsequent pathological tests confirmed its in vivo compatibility. RESULTS: The SEM revealed that the main component of the monofilament is carbon. In vitro cell experiments demonstrated that novel material does not affect cell activity and proliferation. Protein adsorption assays indicated that the contrast-enhanced material does not cause additional inflammatory responses. In addition, in vivo experiments illustrated that PP/Ba mesh can be detected by CT and has good in vivo compatibility. CONCLUSION: These results highlight the excellent biocompatibility of the contrast-enhanced material, which is suitable for human abdominal wall tissue engineering. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s13770-022-00460-6.
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- 2022
40. The Mitochondrial Genomes of Two Parasitoid Wasps Protapanteles immunis and Parapanteles hyposidrae (Hymenoptera: Braconidae) with Phylogenetic Implications and Novel Gene Rearrangements
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Dandan Xiao, Ziqi Wang, Jiachen Zhu, Xiaogui Zhou, Pu Tang, and Xuexin Chen
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Genetics ,Genetics (clinical) - Abstract
Parapanteles hypsidrae (Wilkinson, 1928) and Protapanteles immunis (Haliday, 1834) are the most important parasitic wasps of Ectropis grisescens Warren and Ectropis obliqua (Prout). We sequenced and annotated the mitochondrial genomes of Pa. hyposidrae and Pr. immunis, which are 17,063 bp and 16,397 bp in length, respectively, and possess 37 mitochondrial genes. We discovered two novel types of gene rearrangement, the local inversion of nad4L in Pa. hyposidrae and the remote inversion of the block cox3-nad3-nad5-nad4 in Pr. immunis, within the mitogenomes of Braconidae. The phylogenetic analysis supported the subfamily Microgastrinae is a monophyletic group, but the tribes Apantelini and Cotesiini within this subfamily are paraphyletic groups.
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- 2023
41. Highly conductive thin composite solid electrolyte with vertical Li7La3Zr2O12 sheet arrays for high-energy-density all-solid-state lithium battery
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Jingtao Wang, Shiyuan Guo, Zhenghua Li, Weijie Kou, Jiachen Zhu, Jingchuan Dang, Yafang Zhang, and Wenjia Wu
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General Chemical Engineering ,Environmental Chemistry ,General Chemistry ,Industrial and Manufacturing Engineering - Published
- 2022
42. MOF lamellar membrane-derived LLTO solid state electrolyte for high lithium ion conduction
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Wenying Dong, Yafang Zhang, Jiachen Zhu, Ruixin Lv, Zhenghua Li, Wenjia Wu, Wenpeng Li, and Jingtao Wang
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Filtration and Separation ,General Materials Science ,Physical and Theoretical Chemistry ,Biochemistry - Published
- 2022
43. Pancreatic Extracellular Matrix/Alginate Hydrogels Provide a Supportive Microenvironment for Insulin-Producing Cells
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Yan Huang, Yahong Zhao, Biwen Zhu, Jiachen Zhu, Dongzhi Wang, Zhiwei Wang, Yibing Guo, Yuhua Lu, and Yi Zhu
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Decellularization ,Chemistry ,Alginates ,Insulin ,medicine.medical_treatment ,Biomedical Engineering ,Hydrogels ,Cell biology ,Extracellular Matrix ,Biomaterials ,Transplantation ,Extracellular matrix ,Phosphatidylinositol 3-Kinases ,In vivo ,Insulin-Secreting Cells ,medicine ,Extracellular ,Induced pluripotent stem cell ,PI3K/AKT/mTOR pathway - Abstract
Type 1 diabetes mellitus (T1DM), as an autoimmune deficiency disease, is associated with an absolute deficiency of insulin subject to islet β-cell destruction. Insulin-producing cells (IPCs) differentiated from induced pluripotent stem cells are an ideal replacement origin of β-cells, which can be applied for cell transplantation therapies in T1DM. At present, more strategies focus on inducing and differentiating to obtain IPCs; however, the unsatisfactory differentiation efficiency and the lack of ideal carriers for in vivo transplantation limited their application. It is necessary to consider the cell microenvironment by constructing a biomimetic niche to improve the differentiation and transplantation efficiency. The main components of the extracellular matrix derived from pancreatic (the niche of β-cells) decellularization were retained, which could provide the ideal extracellular microenvironment for IPCs. In this research, a hydrogel prepared with alginate (Alg) and the pancreatic extracellular matrix (pECM) was assessed for the beneficial outcomes on encapsulated IPCs. The results showed that pECM/Alg improved the differentiation efficiency and promoted insulin secretion and the expression of insulin-related genes as well. Besides, pECM/Alg-encapsulated IPCs exhibited obvious biocompatibility in vivo, which can prolong the transplantation effect and hypoglycemic function by reducing the inflammatory reaction. RNA-seq indicated that the PI3K/Akt pathway may be related to the improvement of the differentiation efficiency and function of IPCs. In general, the pECM/Alg hydrogel provides an ideal biomimetic microenvironment for IPCs and is suitable for in vivo transplantation.
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- 2021
44. The complete mitochondrial genome of Trichopria drosophilae (Hymenoptera: Diapriidae)
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Min Shi, Xue-Xin Chen, Huang Jianhua, Zhongqiu Pan, Jiani Chen, Sicong Zhou, Jiachen Zhu, Zhang Xian, and Lan Pang
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0106 biological sciences ,0301 basic medicine ,Mitochondrial DNA ,animal structures ,biology ,fungi ,Biological pest control ,Trichopria drosophilae ,food and beverages ,Hymenoptera ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,humanities ,Diapriidae ,Parasitoid ,Pupa ,03 medical and health sciences ,030104 developmental biology ,Evolutionary biology ,Genetics ,Molecular Biology ,Drosophila - Abstract
Trichopria drosophilae (Hymenoptera: Diapriidae) is an important pupal endoparasitoid of Drosophila species, which has been found to be an ideal biocontrol agent to D. suzukii. In this study, the c...
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- 2020
45. The complete mitochondrial genome of Asobara japonica (Hymenoptera: Braconidae)
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Huang Jianhua, Xue-Xin Chen, Zhizhi Wang, Xian Zhang, Min Shi, Chaoqun Li, Jiachen Zhu, and Zhongqiu Pan
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0106 biological sciences ,0301 basic medicine ,Mitochondrial DNA ,animal structures ,fungi ,food and beverages ,Zoology ,Hymenoptera ,Biology ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Parasitoid ,03 medical and health sciences ,030104 developmental biology ,Asobara japonica ,parasitic diseases ,Genetics ,PEST analysis ,Drosophila melanogaster ,Drosophila suzukii ,Molecular Biology ,Braconidae - Abstract
Asobara japonica is an important larval-pupal endoparasitoid of Drosophila melanogaster and some other fruit fly species, such as Drosophila suzukii, and is an invasive and economic pest. In this s...
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- 2020
46. The Crystallization Kinetics of Ni-Mn-Ga Magnetic Shape Memory Alloy Thin Films
- Author
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Wenbin Zhao, Changlong Tan, Wei Cai, Kun Zhang, Jiachen Zhu, and Zhai-Ping Yang
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010302 applied physics ,Materials science ,Thermodynamics ,02 engineering and technology ,Activation energy ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Isothermal process ,Electronic, Optical and Magnetic Materials ,law.invention ,Differential scanning calorimetry ,Magnetic shape-memory alloy ,law ,Martensite ,Vacancy defect ,0103 physical sciences ,Materials Chemistry ,Electrical and Electronic Engineering ,Thin film ,Crystallization ,0210 nano-technology - Abstract
The crystallization mechanism of Ni-Mn-Ga thin films and the reason for the difference of crystallization temperatures of Ni-Mn-based magnetic shape memory alloys (MSMAs) are unknown. Here, the crystallization kinetics of Ni53Mn28Ga19 magnetic shape memory alloy thin films have been determined by non-isothermal and isothermal differential scanning calorimetry (DSC). The reason for the difference of crystallization temperatures of Ni-Mn-based MSMAs was studied by the first-principles methods. The crystal structure of annealed Ni53Mn28Ga19 thin films are 7 M martensite. In non-isothermal DSC, crystallization peak temperatures are 588.2 K, 593.7 K, 601.3 K, 604.6 K and 608.2 K at different heating rates. The apparent activation energy calculated by Kissinger’s method is 148.3 kJ/mol. For isothermal crystallization, the Avrami exponent of Ni53Mn28Ga19 thin films is approximately 1.6. The local Avrami exponents n(x) which range from 1.1 to 2.8 imply that the crystallization mechanism of Ni53Mn28Ga19 thin films changes from one-dimensional diffusion-controlled growth to two-dimensional and three-dimensional diffusion-controlled growth. Moreover, it is found that crystallization peak temperatures of Ni-Mn-based MSMAs increase with their increasing vacancy formation energy with Ni vacancy.
- Published
- 2019
47. Multifunctional and dynamically tunable terahertz metamaterials based on TiNi shape memory alloy films with a simple design
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Kun Zhang, Juan Liu, Changlong Tan, Jiachen Zhu, and Xiaohua Tian
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Materials science ,Terahertz radiation ,QC1-999 ,Terahertz ,General Physics and Astronomy ,Physics::Optics ,02 engineering and technology ,01 natural sciences ,Shape memory alloy films ,0103 physical sciences ,Transmittance ,010302 applied physics ,business.industry ,TiNi alloy films ,Physics ,Metamaterial ,Resonance ,Shape-memory alloy ,021001 nanoscience & nanotechnology ,Dipole ,Filter (video) ,Metamaterials ,Martensitic transformation ,Optoelectronics ,0210 nano-technology ,business ,Order of magnitude - Abstract
In the terahertz (THz) fields, a crucial point of restricting its development and application is the lack of dynamic and multifunctional materials. In this work, NiTi films are innovatively introduced into the design, and multifunctional and dynamically tunable terahertz metamaterials are proposed. The influence and mechanism of the shape deformation and conductivity changes before and after martensitic transformation on the electromagnetic response are systematically investigated and revealed. Based on the novel NiTi metamaterials, inductance-capacitance (LC) resonance and dipole resonance are used simultaneously for the terahertz filter, and an excellent dual-band filter is obtained. The frequencies of both LC and dipolar resonances can be dynamically tuned to the desired operating frequencies by driving the martensitic transformation. And the resonant frequency of the band-stop filter achieves a dynamic modulation range up to 0.56 THz. Furthermore, the results also show that when martensitic transformation occurs, the terahertz wave transmission can be tuned from 0.78 to 0.04 at 0.47 THz. Moreover, as an excellent switch, the ON state transmittance is one order of magnitude higher than the OFF-state transmittance. In brief, this study provides a new perspective and ideas for developing a tunable dual-band terahertz filter and thermal-induced terahertz switch.
- Published
- 2021
48. Dynamically tunable and polarization-insensitive dual-band terahertz metamaterial absorber based on TiNi shape memory alloy films
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Jiachen Zhu, Kun Zhang, Tianyou Ma, Xiaohua Tian, Juan Liu, and Changlong Tan
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Materials science ,Terahertz radiation ,General Physics and Astronomy ,02 engineering and technology ,01 natural sciences ,Shape memory alloy films ,0103 physical sciences ,Figure of merit ,Absorption (electromagnetic radiation) ,010302 applied physics ,business.industry ,TiNi alloy films ,Resonance ,Metamaterial ,021001 nanoscience & nanotechnology ,Polarization (waves) ,lcsh:QC1-999 ,Metamaterials ,Martensitic transformation ,Metamaterial absorber ,Optoelectronics ,0210 nano-technology ,business ,Refractive index ,Terahertz metamaterial absorber ,lcsh:Physics - Abstract
A crucial point of restricting its development and application is the lack of dynamically tunable devices in the terahertz fields. In this work, shape memory alloys (SMAs) are innovatively introduced into the design of THz metamaterials absorber (MMA). An optimized structure design is proposed, and the MMA exhibits the perfect properties of dynamical tuning, polarization insensitivity, and dual-band absorption. In detail, two discrete resonance peaks can be detected, and their corresponding absorbance is up to 98.8% at 0.9982 THz and 96.8% at 1.5328 THz, respectively. The effect of structural parameters on the absorption performance is investigated further to reveal these two peaks' formation mechanism. Based on the martensitic transformation of TiNi alloy, the absorption peaks can be dynamically tuned to the desired operating frequencies through varying the external thermal field. Meanwhile, the absorber is polarization-insensitive when it is incident vertically due to the symmetry of the structure, and the excellent absorption performance can be maintained over a wide angular range of incidence. On account of the ultra-narrow bandwidth and the high-quality factor Q, we discuss the sensing ability of peak B. It can be found that peak B is sensitive to a minor change of the refractive index n of surrounding media and shows sensing ability. Through theoretical analysis, the sensitivity of the sensor is up to 0.88 THz/RIU, and the sensor’s figure of merit can be up to 92.63. This work proposes a novel idea of the design of various SMAs-based dynamically tunable terahertz optical devices.
- Published
- 2021
49. Supplementary material to 'Effects of ozone-vegetation interactions on meteorology and air quality in China using a two-way coupled land-atmosphere model'
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Jiachen Zhu, Amos P. K. Tai, and Steve Hung Lam Yim
- Published
- 2021
50. Longitudinal assessment of glymphatic changes following mild traumatic brain injury: Insights from perivascular space burden and DTI-ALPS imaging
- Author
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Jiachen Zhuo, Prashant Raghavan, Jiang Li, Steven Roys, Rosy Linda Njonkou Tchoquessi, Hegang Chen, Emerson M. Wickwire, Gunjan Y. Parikh, Gary T. Schwartzbauer, Lynn M. Grattan, Ze Wang, Rao P. Gullapalli, and Neeraj Badjatia
- Subjects
traumatic brain injury ,glymphatic system ,perivascular space ,diffusion tensor imaging ,MRI ,sleep disturbance ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
IntroductionTraumatic brain injury (TBI) even in the mild form may result in long-lasting post-concussion symptoms. TBI is also a known risk to late-life neurodegeneration. Recent studies suggest that dysfunction in the glymphatic system, responsible for clearing protein waste from the brain, may play a pivotal role in the development of dementia following TBI. Given the diverse nature of TBI, longitudinal investigations are essential to comprehending the dynamic changes in the glymphatic system and its implications for recovery.MethodsIn this prospective study, we evaluated two promising glymphatic imaging markers, namely the enlarged perivascular space (ePVS) burden and Diffusion Tensor Imaging-based ALPS index, in 44 patients with mTBI at two early post-injury time points: approximately 14 days (14Day) and 6–12 months (6–12Mon) post-injury, while also examining their associations with post-concussion symptoms. Additionally, 37 controls, comprising both orthopedic patients and healthy individuals, were included for comparative analysis.ResultsOur key findings include: (1) White matter ePVS burden (WM-ePVS) and ALPS index exhibit significant correlations with age. (2) Elevated WM-ePVS burden in acute mTBI (14Day) is significantly linked to a higher number of post-concussion symptoms, particularly memory problems. (3) The increase in the ALPS index from acute (14Day) to the chronic (6–12Mon) phases in mTBI patients correlates with improvement in sleep measures. Furthermore, incorporating WM-ePVS burden and the ALPS index from acute phase enhances the prediction of chronic memory problems beyond socio-demographic and basic clinical information.ConclusionePVS burden and ALPS index offers distinct values in assessing glymphatic structure and activity. Early evaluation of glymphatic function could be crucial for understanding TBI recovery and developing targeted interventions to improve patient outcomes.
- Published
- 2024
- Full Text
- View/download PDF
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