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Highly Efficient Broadband Achromatic Microlens Design Based on Low-Dispersion Materials

Engineering 2024年第7期38卷 194-200页

作者： Xueqian Wang Chuanbao Liu Feilou Wang Weijia Luo Chengdong Tao yuxuan hou Lijie Qiao Ji Zhou Jingbo Sun Yang Bai Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Materials and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Metalenses with achromatic performance offer a new opportunity for high-quality imaging with an ultracompact configuration;however,they suffer from complex fabrication processes and low focusing *** this study,we propose an efficient design method for achromatic microlenses on a wavelength scale using materials with low dispersion,an adequately designed convex surface,and a thickness profile *** taking into account the absolute chromatic aberration,relative focal length shift(FLS),and numerical aperture(NA),microlens with a certain focal length can be realized through our realized map of geometric ***,the designed achromatic microlenses with low-dispersion fused silica were fabricated using a focused ion beam,and precise surface profiles were *** fabricated microlenses exhibited a high average focusing efficiency of 65%at visible wavelengths of 410-680 nm and excellent achromatic capability via white light ***,the design exhibited the advantages of being polarization-insensitive and *** results demonstrate the effectiveness of our proposed achromatic microlens design approach,which expands the prospects of miniaturized optics such as virtual and augmented reality,ultracompact microscopes,and biological endoscopy.

关键词： Broadband achromatic focusing Metamaterials Low dispersion materials Visible wavelength Microlenses

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熔融石英陶瓷浆料流变性能与光固化成型精度研究

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陶瓷学报 2024年第2期45卷 374-381页

作者：侯雨轩李燕卢秉恒侯瑞凯李燕霞宋索成西安石油大学材料科学与工程学院陕西西安710065 西安交通大学机械学院陕西西安710049 西安交通大学材料学院材料创新设计中心陕西西安710049 国家增材制造创新中心陕西西安710117 北京遥感设备研究所北京100854

由于熔融石英的高透光性,陶瓷浆料光固化成型过程中存在严重的过固化现象。为了消除这种过固化现象,并提高成型精度与性能,需要制备出高吸光度、低黏度的熔融石英陶瓷浆料。通过对熔融石英粉末的改性以及分散剂BYK-9076的含量调控改善... 详细信息

由于熔融石英的高透光性,陶瓷浆料光固化成型过程中存在严重的过固化现象。为了消除这种过固化现象,并提高成型精度与性能,需要制备出高吸光度、低黏度的熔融石英陶瓷浆料。通过对熔融石英粉末的改性以及分散剂BYK-9076的含量调控改善浆料黏度,并且添加了高强度、高紫外光吸收率以及能够抑制熔融石英高温结晶的B_(4)C颗粒,实现了熔融石英陶瓷浆料的综合优化。结果表明,添加4 wt.%分散剂的浆料黏度比未加分散剂的浆料降低了93%,并用其制备出了固含量57 vol.%的低黏度熔融石英陶瓷浆料。当B_(4)C含量为2.5 wt.%、曝光时间为5 s时,固化深度从1325μm降低至230μm,并且此时固化片在X、Y方向上拥有最优的精度,均为0.01 mm。

关键词：熔融石英光固化成型过固化流变特性 B4C

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乙烯绿色低碳生产技术进展

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油气与新能源 2024年第2期36卷 74-79,86页

作者：王红秋侯雨璇黄格省中国石油天然气股份有限公司石油化工研究院北京100101

科技与产业的有效结合推动乙烯工业的绿色低碳发展。从装置结构、涂层材料、动力供应、原材料等方面综述了乙烯绿色低碳生产技术进展。提出通过炉管强化传热技术、炉管涂层技术与新型炉管材料的应用优化裂解炉热效率;有机框架材料等新... 详细信息

科技与产业的有效结合推动乙烯工业的绿色低碳发展。从装置结构、涂层材料、动力供应、原材料等方面综述了乙烯绿色低碳生产技术进展。提出通过炉管强化传热技术、炉管涂层技术与新型炉管材料的应用优化裂解炉热效率;有机框架材料等新型分离材料具有优化乙烯分离过程的潜力;可再生能源装机和消纳能力的提高,为乙烯装置的电气化提供了绿色基础;采用生物质、废塑料、二氧化碳等原料替代化石原料将从原料端实现乙烯生产的绿色化。此外,生产过程智能化以及用能清洁化等也将在减碳方面发挥重要作用。

关键词：乙烯装置绿色低碳技术创新乙烯裂解炉电气化

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国际能源化工公司生物化工业务发展策略分析

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石油科技论坛 2024年第2期43卷 30-38页

作者：雪晶鲜楠莹付凯妹侯雨璇中国石油天然气股份有限公司石油化工研究院

生物化工通常以生物质为原料,或采用相对温和的生物发酵过程,具有典型的绿色特征,已成为“净零碳”目标下国际能源化工公司战略布局的重点之一。巴斯夫、道达尔能源、杜邦、埃克森美孚4家公司生物化工业务入局较早,且非常重视技术创新,... 详细信息

生物化工通常以生物质为原料,或采用相对温和的生物发酵过程,具有典型的绿色特征,已成为“净零碳”目标下国际能源化工公司战略布局的重点之一。巴斯夫、道达尔能源、杜邦、埃克森美孚4家公司生物化工业务入局较早,且非常重视技术创新,结合自身优势各有侧重地部署新业务。巴斯夫推出生物质平衡方案,重视关键中间体的生物替代,围绕工业生物技术超前布局;道达尔能源以生物燃料为切入点,上下游统筹布局,不断强化产品优势;杜邦公司敏锐捕捉市场机遇,持续追求差异化竞争优势;埃克森美孚坚持油品业务主线,适时调整生物燃料布局重点,保持技术的领先性。我国企业可借鉴国际主要能源化工公司的发展模式及经验,结合公司业务定位,加速科技创新向产业应用转变。

关键词：能源公司化工公司生物化工发展策略生物燃料生物基化学品生物基材料

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Orientation-dependent ductility and deformation mechanisms in body-centered cubic molybdenum nanocrystals

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Journal of Materials Science & Technology 2023年第23期154卷 107-113页

作者： Huayu Peng yuxuan hou He Zheng Ligong Zhao Ying Zhang Weiwei Meng Ting Liu Peili Zhao Shuangfeng Jia Jianbo Wang School of Physics and Technology Center for Electron Microscopy MOE Key Laboratory of Artificial Micro- and Nano-structures and Institute for Advanced Studies Wuhan University Wuhan 430072 China Suzhou Institute of Wuhan University Suzhou Jiangsu 215123 China Wuhan University Shenzhen Research Institute Shenzhen Guangdong 518057 China Core Facility of Wuhan University Wuhan 430072 China

The knowledge regarding anisotropic mechanical behaviors in nanoscale body-centered cubic (bcc) metals remains obscure. Herein, we report the orientation-dependent ductility in bcc Mo nanocrystals (NCs), which exhibit poor ductility along [110] direction but possess relatively better ductility along the [001] and [112] orientations. The origin of different deformability can be traced down to the distinct deformation mechanisms: the unexpected crack nucleation and propagation induce premature fractures in [110]-oriented NCs;in contrast, deformation twinning could contribute to the enhanced ductility in [001]-oriented NCs;interestingly, we find the activation of multiple dislocation slips in [112]-oriented NCs with the highest ductility. Further molecular dynamics simulations provide deeper insights into the defect dynamics that are closely interlinked with experimental observations. Our findings advance the basic understanding of orientation-dependent mechanical properties and help to guide endeavors to architecture the microstructures of bcc metals with enhanced ductility.

关键词： In-situ tension test Ductility Crack Deformation twinning Dislocation slips Mo nanocrystals

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Learning-based parameter prediction for quality control in three-dimensional medical image compression

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Frontiers of Information Technology & Electronic Engineering 2021年第9期22卷 1169-1178页

作者： yuxuan hou Zhong REN Yubo TAO Wei CHEN State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China The First Affiliated Hospital Zhejiang UniversityHangzhou 310003China

Quality control is of vital importance in compressing three-dimensional(3D)medical imaging *** com-pression parameters need to be determined based on the specific quality *** high efficiency video coding(HEVC),regarded as the state-of-the-art compression tool,the quantization parameter(QP)plays a dominant role in controlling *** direct application of a video-based scheme in predicting the ideal parameters for 3D medical image compression cannot guarantee satisfactory *** this paper we propose a learning-based parameter prediction scheme to achieve efficient quality *** kernel is a support vector regression(SVR)based learning model that is capable of predicting the optimal QP from both vid-eo-based and structural image features extracted directly from raw data,avoiding time-consuming processes such as pre-encoding and iteration,which are often needed in existing *** results on several datasets verify that our approach outperforms current video-based quality control methods.

关键词： Medical image compression High efficiency video coding(HEVC) Quality control Learning-based

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Infection and Colonization of Pathogenic Fungus Fusarium proliferatum in Rice Spikelet Rot Disease

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Rice science 2019年第1期26卷 60-68页

作者： SUN Lei WANG Ling LIU Lianmeng hou yuxuan XU Yihua LIANG Mengqi GAO Jian LI Qiqin HUANG Shiwen College of Agronomy Guangxi University State Key Laboratory of Rice Biology China National Rice Research Institute

Rice spikelet rot disease(RSRD), caused by Fusarium proliferatum, is an emerging disease. So far, the effects of diseased rice floral organs as well as the primary infection sites and stages of this pathogen are not determined. We investigated changes in the floral organs, along with the infection processes of the pathogen in plants inoculated with F. proliferatum and labelled with a green fluorescent protein during different growth stages of rice. The results showed that RSRD is not a systemic infectious disease, which has negative effects on the fertility of the infected rice. F. proliferatum caused brown colored anthers, crinkled pistils and ovaries, pollen grain deformities and anther indehiscence. The number of pollen grains on the stigmas decreased significantly in the infected spikelets, and the anther dehiscence and seed-setting rate successively declined by 69% and 73%, respectively, as a result of the infection. The initial infection stage occurred at the pollen cell maturity stage, and the primary invasion sites were determined to be the anthers of rice. It was noted that the pathogen mainly damaged the pollen cells, and with the exception of the filaments, proceeded to colonize the pistils and endosperm.

关键词： Fusarium proliferatum rice spikelet rot disease green fluorescent protein infection process infection stage invasion site

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Enhanced energy-storage performance in a flexible film capacitor with coexistence of ferroelectric and polymorphic antiferroelectric domains

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Journal of Materiomics 2022年第2期8卷 375-381页

作者： Xiaokuo Er Peng Chen Jiesen Guo yuxuan hou Xiaobo Yu Pingping Liu Yang Bai Qian Zhan School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China School of Mathematics and Physics China University of Geosciences BeijingBeijing100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China

Advances in flexible electronics are driving dielectric capacitors with high energy storage density toward flexibility and *** the present work,an all-inorganic thin film dielectric capacitor with the coexistence of ferroelectric(FE)and antiferroelectric(AFE)phases based on Pb_(0.96)La_(0.04)(Zr_(0.95)Ti_(0.05))O_(3)(PLZT)was prepared on a 2D fluorophlogopite mica substrate via a simple one-step *** flexible capacitor exhibits a high recoverable energy density(U_(rec))of z 44.2 J/cm^(3),a large electric breakdown strength(E BDS)of 3011 kV/cm,excellent frequency stability(500 Hz-20 kHz)and high thermal stability over 30-190℃.It also demonstrates an outstanding bending endurance,which can maintain a high energy storage performance under various bending radii(R=2-10 mm)or 103 repeated bends at 4 *** FE phase is stable near the film surface and the interface with the bottom *** AFE phase with multi-domains has incommensurate modulation structures with super-periodicity of 6.5,6.9 and *** indicates that the PLZT/LNO/F-Mica capacitor has high potential for energy storage application and may provide great opportunities for exploring new energy storage materials.

关键词： Flexible dielectric capacitor Thermal stability Bending endurance Energy storage

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Large electrocaloric effect over a wide temperature span in lead-free bismuth sodium titanate-based relaxor ferroelectrics

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Journal of Materiomics 2023年第2期9卷 289-298页

作者： Xiaopo Su Junjie Li yuxuan hou Ruowei Yin Jianting Li Shiqiang Qin Yanjing Su Lijie Qiao Chuanbao Liu Yang Bai Beijing Advanced Innovation Center for Materials Genome Engineering and Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China College of Optoelectronic Engineering Chengdu University of Information TechnologyChengdu610225China School of Mechanical and Automotive Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China

For efficient solid-state refrigeration technologies based on electrocaloric effect(ECE),it is a great challenge of simultaneously obtaining a large adiabatic temperature change(DT)within a wide temperature span(Tspan)in lead-free ferroelectric ***,we studied the electrocaloric effect(ECE)in(1-x)(Na_(0.5)Bi_(0.5))TiO_(3)-xCaTiO_(3)((1-x)NBT-xCT)and explored the combining effect of morphotropic phase boundary(MPB)and relaxor *** addition of CT not only constructs a MPB region with the coexistence of rhombohedral and orthorhombic phases,but also enhances the relaxor *** ECE peak appears around the freezing temperature(Tf),and shifts toward to lower temperature with the increasing CT *** directly measured ECE result shows that the ceramic of x=0.10,which is in the MPB region,has an optimal ECE property of DTmax=1.28 K@60℃under 60 kV/cm with a wide Tspan of 65*** enhanced ECE originates from the electric-field-induced transition between more types of polar nanoregions and long-range ferroelectric *** the composition with more relaxor feature in the MPB region,such as x?0.12,the ECE is relatively weak under low electric fields but it exhibits a sharp increment under a sufficiently high electric *** work provides a guideline to develop the solidestate cooling devices for electronic components.

关键词： Electrocaloric effect Relaxor ferroelectric Morphotropic phase boundary (Na_(0.5)Bi_(0.5))TiO_(3)

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WRKY72 Negatively Regulates Seed Germination Through Interfering Gibberellin Pathway in Rice

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Rice science 2021年第1期28卷 1-5页

作者： Wang Huimei hou yuxuan Wang Shuang Tong Xiaohong Tang Liqun Abolore Adijat Ajadi Zhang Jian Wang Yifeng State Key Lab of Rice Biology China National Rice Research InstituteHangzhou 311400China College of Life Science Yangtze UniversityJingzhou 434025China

Seed germination is associated with grain yield and quality in crop *** acid(GA)serves as a major phytohormone in the promotion of seed *** is synthesized in the embryos and transmitted to the aleurone layers,where GA triggers the synthesis and secretion of a set of hydrolases,especiallyα-***,the storage nutrients such as starch in the endosperm are digested by these hydrolases and absorbed by the embryo to sustain seed germination and early seedling establishment(Kaneko et al,2002).The detailed GA biosynthesis process has been well studied and thoroughly reviewed in several literatures(Sakamoto et al,2004;Reinecke et al,2013).Briefly,geranylgeranyl diphosphate(GGDP)is turned into ent-kaurene by two terpene synthases,ent-copalyl diphosphate synthase(CPS)and ent-kaurene synthase(KS).Subsequently,the conversion of GA precursor ent-kaurene to ent-kaurenoic acid is catalyzed by ent-kaurene oxidase(KO),and that from ent-kaurenoic acid to GA12 is catalyzed by ent-kaurenoic acid oxidase(KAO).Ultimately,GA12 is converted to various GA intermediates and bioactive GAs by GA20-oxidase(GA20ox)and GA3-oxidase(GA3ox),respectively.

关键词： catalyzed thoroughly converted

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