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Effects of the Cooling Rate on Mechanical Properties and Microstructure of Near-Α Ti-6al-3zr-2nb-Mo Alloy

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SSRN 2022年

To quantitatively understand the influence of the cooling rate on the microstructural evolution and mechanical properties of titanium alloy forgings, we investigate the mechanical properties and microstructures of Ti-6Al-3Zr-2Nb-Mo (Ti6321) in different cooling mediums by combining mechanical tests, optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results revealed that with the increase of the cooling rate, the width of the secondary α ( α s / α ´) phase decreased;therefore, the ultimate tensile and yield strengths increased. Furthermore, the impact property of alloy was decreased, which is attributed to the decreased volume fraction of the primary α ( α p ) phase. Based on in-depth structural characterizations and mechanical evaluations, the quantitative link between the cooling rate and the width of α s / α ´ phase, and a quantitative description of the relationship between the YS and the width of α s / α ´ phase are established. Our work provides theoretical guidance for the heat treatment of thick forging of Ti6321 for industrial production. © 2022, The Authors. All rights reserved.

关键词： Microstructure

Domestic Violence Crisis Recognition Method based on Bi-LSTM+Attention

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Domestic Violence Crisis Recognition Method based on Bi-LSTM...

International Conference on Network and Information Systems for Computers (ICNISC)

作者： Zhixiao Wang Wenyao Yan Zhuochun Li Min Huang Qinyuan Fan Xin Wang Xi'an University of Technology Xi'an China Shaanxi Key Laboratory of Network Computing and Security Xi'an China College of Xi'an Innovation Yan'an University Xi'an China University of Pittsburgh Pittsburgh PA USA Art and Design Xi'an University of Technology Xi'an China Fakultät Verkehrs- und Maschinensysteme Technische Universität Berlin Berlin Germany Computer Science and Engineering Xi'an University of Technology Xi'an China

ISBN: (纸本)9781665453523

Domestic violence (DV) is getting more and more attention due to the critical trouble and danger that pose great challenge to human rights and health. The popularity of various social medias can help these victims to share their experiences and obtain more possible support from numerous open communities. However, it is not only inefficient but also laborious and time-consuming to manually access and browse through a great deal of available posts on the Internet and social media space. Therefore, considering the advantages of Deep Learning (DL) technology in Natural Language Processing, adopting DL as an efficient strategy for automatic recognition and evaluation of DV victims is in the urgent requirements. This paper takes social media Facebook posts about domestic violence as the research object and uses Word2Vec to build word vector model. The paper uses Bi-LSTM+self-Attention deep learning models to accomplish DV crisis recognition task and compares it with CNN, RNN and LSTM. The assessment of experimental results show that the accuracy of CNN and LSTM are both above 90% which is better than RNN; And the accuracy of Bi-LSTM is the highest after using the Attention mechanism. The research results of this article will provide reference and help for public DVCS to rescue DV victims.

关键词： Deep learning Social networking (online) Computational modeling Blogs Manuals Predictive models Data models

High-Resolution Particle Density Measurement for Argon Plasma Plume by Image Reconstruction and Collisional-Radiative Model

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SSRN 2022年

作者： Han, Xing Wang, Yimeng Chen, Zhiyuan Wang, Yibai Wu, Jianjun Tang, Haibin Cao, Jinbin School of Space and Environment Beihang University Beijing100083 China School of Astronautics Beihang University Beijing100083 China Key Laboratory of Spacecraft Design Optimization and Dynamic Simulation Technologies of the Ministry of Education Beihang University Beijing100083 China Aircraft and Propulsion Laboratory Ningbo Institute of Technology Beihang University Ningbo315100 China College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China Laboratory of Space Environment monitoring and Information Processing Ministry of Industry and Information Technology Beijing100083 China

A measurement method of the high-resolution atom and ion density distributions based on the image reconstruction and collisional-radiative model is presented and could apply to the parameter measurement of the axisymmetric argon plasma plume. The projection integral signals of two-band ion spectral lines and one-band atom spectral line are acquired, and the spatial distribution of the light intensity signals are obtained by the image reconstruction technique. The collisional-radiative model includes the major atomic levels and singly ionized argon levels, taking into account electron-impact excitation and ionization, electron-impact deexcitation, three-body recombination processes to obtain the theoretical signal intensity in the wavelength bands as a function of electron temperature, electron density, and atom density. The plasma parameters are determined by the theoretical signal intensity and spatial light intensity with the three filters, and the common coefficient is calibrated by the known parameters of some positions. The method was applied to the plume region of an applied-field magnetoplasmadynamic thruster to verify the feasibility of this method in comparison with the electrostatic probe, and the plasma parameters with a spatial resolution of 0.81 mm/pixel were obtained finally. © 2022, The Authors. All rights reserved.

关键词： Argon

Predicting convection configurations in coupled fluid-porous systems

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arXiv

arXiv 2022年

作者： McCurdy, Matthew Moore, Nicholas J. Wang, Xiaoming Department of Mathematics and Computer Science Ohio Wesleyan University DelawareOH43015 United States Department of Mathematics Colgate University HamiltonNY13346 United States Department of Mathematics SUSTech International Center for Mathematics National Center for Applied Mathematics Shenzhen Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen518055 China Department of of Mathematics and Statistics Missouri University of Science and Technology RollaMO65409 United States

A ubiquitous arrangement in nature is a free-flowing fluid coupled to a porous medium, for example a river or lake lying above a porous bed. Depending on the environmental conditions, thermal convection can occur and may be confined to the clear fluid region, forming shallow convection cells, or it can penetrate into the porous medium, forming deep cells. Here, we combine three complementary approaches - linear stability analysis, fully nonlinear numerical simulations, and a coarse-grained model - to determine the circumstances that lead to each configuration. The coarse-grained model yields an explicit formula for the transition between deep and shallow convection in the physically relevant limit of small Darcy number. Near the onset of convection, all three of the approaches agree, validating the predictive capability of the explicit formula. The numerical simulations extend these results into the strongly nonlinear regime, revealing novel hybrid configurations in which the flow exhibits a dynamic shift from shallow to deep convection. This hybrid shallow-to-deep convection begins with small, random initial data, progresses through a metastable shallow state, and arrives at the preferred steady-state of deep convection. We construct a phase diagram that incorporates information from all three approaches and depicts the regions in parameter space that give rise to each convective *** Codes 76S05, 82B26, 76M10 © 2022, CC BY.

关键词： Porous materials

Synthesis of Amorphous-Mno2/Clinoptilolite and its Utilization for Nh4+-N Oxidation in an Anoxic Environment

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SSRN 2023年

作者： Liu, Caocong Zhuo, Yiyuan Chen, Yuzhe Mao, Yuanxiang Shen, Qiushi Ma, Rui Cheng, Linsong Ji, Fangying Xu, Xiaoyi Ma, Jiangsen Key Laboratory of Three Gorges Reservoir Region's Eco-Environment Ministry of Education Chongqing University Chongqing400045 China College of Environment and Ecology Chongqing University Chongqing400045 China China Southwest Architectural Design and Research Institute Co. Ltd. Chengdu610042 China School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215001 China

Mediating the anoxic ammonia oxidation with manganese oxide (MnOx) can reduce the requirements of dissolved oxygen (DO) concentrations in constructed wetlands (CWs) and improve the removal of ammonium nitrogen (NH4+-N). Recent studies that employed natural manganese ore and/or mine waste as substrates in CWs may develop potentially negative environmental effects due to leachates. However, removing NH4+-N by anoxic ammonia oxidation is influenced by the crystal form of MnOx. In this study, a novel clinoptilolite-based amorphous-MnO2 (amorphous-MnO2/clinoptilolite) was synthesized by the sol-gel method as an alternative substrate to improve the efficiency of anoxic ammonia oxidation and reduce the impact of Mn ion leaching. According to the anoxic ammonia oxidation experiment of clinoptilolite, amorphous-MnO2/clinoptilolite, and manganese ore on NH4+-N, the amounts of NH4+-N removed were 24.55 mg/L/d, 44.55 mg/L/d, and 11.04 mg/L/d, respectively, and the initial NH4+-N concentration was 49.53 mg/L. These results indicated that the amorphous-MnO2/clinoptilolite had both the adsorption and the anoxic ammonia oxidation performance. The recycling experiment demonstrated that the effect of anoxic ammonia oxygen mediated by amorphous-MnO2 would not diminish with the gradual saturation of clinoptilolite for NH4+-N. Furthermore, the anoxic ammonia oxidation consumed NH4+-N in the clinoptilolite, which restored the adsorption capacity of the clinoptilolite and simultaneously decreased the leakage of manganese ions in the process, thus reducing environmental risks. Therefore, the amorphous-MnO2/clinoptilolite provided an excellent substrate material for the constructed wetland under an anoxic environment, which greatly improved the nitrogen removal capacity compared to existing substrate materials. © 2023, The Authors. All rights reserved.

关键词： Manganese oxide

The Physalis floridana genome provides insights into the biochemical and morphological evolution of Physalis fruits

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Horticulture Research 2021年第1期8卷 3349-3367页

作者： Jiangjie Lu Meifang Luo Li Wang Kunpeng Li Yongyi Yu Weifei Yang Pichang Gong Huihui Gao Qiaoru Li Jing Zhao Lanfeng Wu Mingshu Zhang Xueyang Liu Xuemei Zhang Xian Zhang Jieyu Kang Tongyuan Yu Zhimin Li Yuannian Jiao Huizhong Wang Chaoying He State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesNanxincun 20100093 XiangshanBeijingChina Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants College of Life and Environmental ScienceHangzhou Normal University310036 HangzhouChina University of Chinese Academy of Sciences Yuquan Road 19100049 BeijingChina Annoroad Gene Technology(Beijing)Co Ltd100176 BeijingChina The Innovative Academy of Seed Design Chinese Academy of SciencesBeijingChina

The fruits of Physalis(Solanaceae)have a unique structure,a lantern-like fruiting calyx known as inflated calyx syndrome(ICS)or the Chinese lantern,and are rich in steroid-related ***,the genetic variations underlying the origin of these characteristic traits and diversity in Physalis remain largely ***,we present a high-quality chromosome-level reference genome assembly of Physalis floridana(~1.40Gb in size)with a contig N50 of~*** evolutionary genomics and experimental approaches,we found that the loss of the SEP-like MADS-box gene MBP21 subclade is likely a key mutation that,together with the previously revealed mutation affecting floral MPF2 expression,might have contributed to the origination of ICS in Physaleae,suggesting that the origination of a morphological novelty may have resulted from an evolutionary scenario in which one mutation compensated for another deleterious ***,the significant expansion of squalene epoxidase genes is potentially associated with the natural variation of steroid-related compounds in Physalis *** results reveal the importance of gene gains(duplication)and/or subsequent losses as genetic bases of the evolution of distinct fruit traits,and the data serve as a valuable resource for the evolutionary genetics and breeding of solanaceous crops.

关键词： breeding evolution bases

An Integrated K-Band Receiving Front-End Module for Satellite Communication 13

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An Integrated K-Band Receiving Front-End Module for Satellit...

13th International Conference on Microwave and Millimeter Wave technology, ICMMT 2021

作者： Xu, Zhong-Lin Dong, Zheng Liao, Hong-Tao Qiu, Liang-Feng She, Sheng-Tuan Wu, Lin-Sheng Mao, Jun-Fa Key Laboratory Of Design And Electromagnetic Compatibility Of High-Speed Electronic Systems Shanghai Jiao Tong University Ministry Of Education No. 800 Dongchuan Road Shanghai200240 China Guangzhou Runxin Information Technology Co. Ltd No. 23 Nanxiang 2 Road Science City Guangzhou510670 China

ISBN: (纸本)9781665434379

In this work, a four-channel RF receiving front-end module is developed in multilayer low-temperature co-fired ceramic for satellite communication with the operating frequency band of 17.720.2 GHz. The dies of low noise amplifiers, phase shifters, attenuators and series-to-parallel convertors are integrated within the volume of 28×28×1.25 mm3, together with an embedded power combiner and lowpass filters. In measurements, the in-band channel gain is greater than 31.5 dB, with the noise figure of 2.32.6 dB, and the suppression against the transmitting band of 2830 GHz is over 50 dB. The controls of 6-bit phase shifting and 5-bit amplitude are also demonstrated. © 2021 IEEE.

关键词： Noise figure

Synthesis of Amorphous-Mno2/Clinoptilolite and Application to Nh4+-N Oxidation in Anoxic Environment

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SSRN 2023年

作者： Liu, Caocong Zhuo, Yiyuan Chen, Yuzhe Mao, Yuanxiang Shen, Qiushi Ma, Jiangsen Ma, Rui Cheng, Linsong Ji, Fangying Xu, Xiaoyi Key Laboratory of Three Gorges Reservoir Region's Eco-Environment Ministry of Education Chongqing University Chongqing400045 China College of Environment and Ecology Chongqing University Chongqing400045 China China Southwest Architectural Design and Research Institute Co. Ltd. Chengdu610042 China School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215001 China

Manganese oxide (MnOx) mediated the anoxic ammonia oxidation can reduce requirements of dissolved oxygen (DO) concentrations in constructed wetlands (CWs) and improve NH4+-N removal efficiency. In recent research, the use of natural manganese ore and/or mine waste as substrate in CWs may have potential negative environmental effects due to leachates. On the other hand, anoxic ammonia oxidation to remove NH4+-N is affected by the crystal form of MnOx. This study, a novel clinoptilolite-based amorphous-MnO2 (amorphous-MnO2/clinoptilolite) was synthesized by sol-gel method as an alternative substrate to improve the efficiency of anoxic ammonia oxidation and reduce the impact of other heavy metal ions in natural minerals. According to the anoxic ammonia oxidation experiment of clinoptilolite, amorphous-MnO2/clinoptilolite and manganese ore on NH4+-N, the removal amount of ammonia nitrogen is 24.55 mg/L/d, 44.55 mg/L/d and 11.04 mg/L/d, respectively at the initial NH4+-N of 49.53 mg/L. This represents that the amorphous-MnO2/clinoptilolite has both the adsorption and the anoxic ammonia oxidation performance. The recycling experiment proved that the effect of anoxic ammonia oxidation mediated by amorphous-MnO2 would not reduce with the gradual saturation of clinoptilolite for NH4+-N. Even, the anoxic ammonia oxidation consumes NH4+-N in the clinoptilolite, which can restore the adsorption capacity of the clinoptilolite, simultaneously decrease the leakage of manganese ion in the process of anoxic ammonia oxygen to reduce environmental risks. The amorphous-MnO2/clinoptilolite provides an excellent substrate material for the constructed wetland under anoxic environment, which greatly improves the nitrogen removal capacity compared with the existing substrate materials. © 2023, The Authors. All rights reserved.

关键词： Wetlands

Fluorescent Carbon Dots Crosslinked Salix Psammophila Microcrystalline Cellulose Interpenetrating Hydrogel System for Sensitive Detection and Efficient Adsorption of Fe3+

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SSRN 2023年

作者： Wang, Boyun Zhong, Yuan Zhang, Wanqi Liu, Zhechen Hu, Zichu Chen, Long Wang, Ximing Zhang, Xiaotao College of Science Inner Mongolia Agricultural University Hohhot010018 China College of Material Science and Art Design Inner Mongolia Agricultural University Hohhot010018 China Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization Hohhot010018 China National Forestry Grassland Engineering Technology Research Center for Efficient Development and Utilization of Sandy Shrub Hohhot010018 China

To combat the contaminating effects of heavy-metal ions on water resources, we prepared blue photonitrogen-doped carbon quantum dots (NCDs) from Salix psammophila (SP) as a raw material, doped them into a microcrystalline cellulose hydrogel, and successfully created a composite hydrogel (NCDs-SP-MCC-gels) for concurrent fluorescence detection and Fe3+ adsorption. The NCDs-SP-MCC-gel was examined for their shape, chemical composition, fluorescence characteristics, and adsorption behaviors. Results demonstrated that the NCD-SP-MCC-gels displayed a broad linear range of Fe3+ fluorescence response (200–1000 mg/L;detection limit = 56.2632 mg/L) and a high adsorption capacity for Fe3+ (610 mg/g). The adsorption data fitted the Langmuir and pseudo-second-order models well. Further research was conducted on Fe3+ detection and adsorption onto the NCD-SP-MCC-gels. This study proposes a green and sustainable way to create a material for the detection and absorption of heavy-metal ions. © 2023, The Authors. All rights reserved.

关键词： Adsorption