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Broadband absorption of macro pyramid structure based flame retardant absorbers

Journal of Materials Science & Technology 2022年第33期128卷 228-238页

作者： Hengda Sun Ying Zhang Yue Wu Yue Zhao Ming Zhou Lie Liu Shaolong Tang Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China General Test Systems Inc. Shenzhen 518102China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

Flame-retardant materials with good electromagnetic wave absorption play an increasingly important role in Over-the-Air(OTA)tests in microwave anechoic chambers.In this work,carbon nanotubes and ammonium polyphosphate(CNTs@APP)composite were prepared by crosslinking with the silane coupling agent(KH550).The flame retardancy is improved with the increase of APP.However,the microwave absorption performance(MAP)and processing difficulty changed greatly as well.Therefore,magnesium aluminum double-layer metal hydroxide(LDH)was obtained by coprecipitation method and processing into the coating,so as to realize flame retardancy which reaches the limiting oxygen index(LOI)of 24.8%and good MAP at the same time.Then,a high-frequency structure simulator(HFSS^(TM))was used to simulate the pyramid model to realize the broadband absorption,and the optimal parameter range was obtained,that is,when the total height of the material is 40 mm,the height of the base accounts for 1/5-1/3,and the tangent of the half top angle is near 1/5,which result in the best MAP.Finally,the broadband absorption of 14.36 GHz(3.64-18 GHz)was realized when the base height is 1/3,and the broadband absorption of 14 GHz(4-18 GHz)can be realized under the condition of large-angle oblique incidence of 0°-60°.

关键词： Electromagnetic wave absorption Broad bandwidth pyramid structure Flame retardant HFSS^(TM)

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Founding Family, pyramid structure and Debt Cost

Founding Family, Pyramid Structure and Debt Cost

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2013年教育技术与管理科学国际会议

作者： Qiu Yizheng Pan Yueping School of accounting Zhejiang Gongshang University

With undeveloped financial market, private firms are facing severe financing constraints. Debt financing from banks is main financing channel for most private firms. Based on the three characteristics of the founding family firms: undiversified investments, long-term investment horizon, and reputation concerns, this paper investigates the impact of founding family on debt cost. We find that, compared to non-family firms, founding family firms enjoy lower debt cost and their debt cost shows lower sensitivity to the pyramid structures. Our results show that founding family is an important variable that affects the firms’ debt cost significantly.

关键词： Founding family control pyramid structure Debt cost

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Ultimate Controller, pyramid structure and Corporate Social Responsibility

Ultimate Controller, Pyramid Structure and Corporate Social ...

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作者： QU Shuyang YU Tianmuzi ZHANG Mengyun JIANG Surong Yunnan University of Finance and Economics

By using the 2008-2019 China’s Shanghai and Shenzhen A-share listed companies’ data set, the authors study the impacts of group management on the level of social responsibility of listed companies based on the perspective of the separation of two rights and the pyramid structure. The authors find that listed companies under group control are more inclined to improve social responsibility performance. Meanwhile, cash-flow rights have significant negative impacts on corporate social responsibility performance, but associated negative impacts will be greatly weakened by the nature of property rights and the institutional environment. After a series of robust tests, the above conclusions are still reliable.This research discussed the economic consequences of group operation at the level of social responsibility, which may help listed companies to further improve their social responsibility performance, and provide enlightenment for the sustainable development of Chinese companies.

关键词： Ultimate Controller pyramid structure Corporate Social Responsibility Business Group

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pyramid-VAE-GAN:Transferring hierarchical latent variables for image inpainting

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Computational Visual Media 2023年第4期9卷 827-841页

作者： Huiyuan Tian Li Zhang Shijian Li Min Yao Gang Pan College of Computer Science and Technology Zhejiang UniversityHangzhou 310027China Advanced Technology Research Institute Zhejiang UniversityHangzhou 310027China

Significant progress has been made in image inpainting methods in recent years.However,they are incapable of producing inpainting results with reasonable structures,rich detail,and sharpness at the same time.In this paper,we propose the pyramid-VAE-GAN network for image inpainting to address this limitation.Our network is built on a variational autoencoder(VAE)backbone that encodes high-level latent variables to represent complicated high-dimensional prior distributions of images.The prior assists in reconstructing reasonable structures when inpainting.We also adopt a pyramid structure in our model to maintain rich detail in low-level latent variables.To avoid the usual incompatibility of requiring both reasonable structures and rich detail,we propose a novel cross-layer latent variable transfer module.This transfers information about long-range structures contained in high-level latent variables to low-level latent variables representing more detailed information.We further use adversarial training to select the most reasonable results and to improve the sharpness of the images.Extensive experimental results on multiple datasets demonstrate the superiority of our method.Our code is available at https://***/thy960112/pyramid-VAE-GAN.

关键词： image inpainting variational autoencoder(VAE) latent variable transfer(LTN) pyramid structure generative model

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Investigations on structured Polyamide for Laser Sintered Body Armor

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Journal of Beijing Institute of Technology 2017年第1期26卷 38-44页

作者： Jinhui Jiang Xinming Qian Mengqi Yuan Tingchao Ji State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China

Stab resistance body armor（SRBA）is essential in protecting people from knife injuries.The protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which causes heavy heat stress for people wearing it.The protective parts of SRBA manufactured using laser sintering（LS）3D printing technology provide high manufacturing flexibility and low weight.Two different structures,plain plate and pyramid-structured plate,were investigated.The pyramid structure showed much higher stab resistance property then the plain plate,because of the angle and thickness effects.This is the first effort applying the LS technology and polyamide（PA）material（PA3200）on SRBA.By applying the pyramid structure on the protective layer of the SRBA,the total weight could reduce 30%-40%.

关键词： stab resistance body armor 3D printing laser sintering pyramid structure

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金字塔结构对投资者的影响

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投资与证券 2011年第2期

作者：曹新伟

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