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直写式3D打印碳纤维/碳化硅陶瓷性能优化

现代制造技术与装备 2024年第2期60卷 4-7,12页

作者：陈志刚李雅芳王烨陆晗婧邵阳学院机械与能源工程学院邵阳422000 邵阳学院高效动力系统智能制造湖南省重点实验室邵阳422000

在陶瓷制备过程中,烧结工艺至关重要,不仅影响陶瓷的显微组织结构,而且决定着陶瓷的力学性能。因此,为提升碳化硅/碳纤维陶瓷样品的性能,优化烧结工艺。采用直写式3D打印的方式,以碳纤维/碳化硅为打印材料,通过三同轴喷嘴挤出打印,以4... 详细信息

在陶瓷制备过程中,烧结工艺至关重要,不仅影响陶瓷的显微组织结构,而且决定着陶瓷的力学性能。因此,为提升碳化硅/碳纤维陶瓷样品的性能,优化烧结工艺。采用直写式3D打印的方式,以碳纤维/碳化硅为打印材料,通过三同轴喷嘴挤出打印,以4种不同的烧结工艺烧结打印的碳纤维/碳化硅陶瓷样品,分析不同烧结工艺对碳纤维/碳化硅陶瓷样品,组织和性能的影响。结果表明:经烧结工艺3,即浸渍液聚碳硅烷与二甲苯的比例为2∶3、以10℃·min^(-1)的升温速率达到烧结温度,烧结后的碳纤维/碳化硅陶瓷样品的组织和性能最好,其致密度可达到95.5%,抗弯强度可达到156 MPa。

关键词：直写式3D打印碳纤维/碳化硅烧结工艺抗弯强度致密度

Clinical observation on effect of scalp electroacupuncture for mild cognitive impairment

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Journal of Traditional Chinese Medicine 2013年第1期33卷 46-50页

作者： Hong Zhang Ling Zhao Sha Yang zhigang chen Yingkun Li Xiaohong Peng Yulong Yang Manjia Zhu Department of Acupuncture and Tuina the Chengdu University of Tranditional Chinese Medicine Department of Acupuncture the Teaching Hospital of Chengdu University of Tranditional Chinese Medicine Department of Tranditional Chinese Medicine the Chengdu Hospital of Integrated Chinese and Western Medicine Department of Tranditional Chinese Medicine the Sichuan Provincial People's Hospital

OBJECTIVE: To evaluate the therapeutic effect of scalp electroacupuncture for mild cognitive impairment (MCI) in the early stage. METHODS: Two hundred and thirty three MCI patients were randomly divided into three groups: the drug group, the scalp electroacupuncture group, and the syndrome differentiation group. For the scalp electroacupuncture group, the points of Baihui (DU 20), Sishecong (EX-HN1), Fengchi (GB 20), and Shenting (DU 24) were selected. For the syndrome differentiation group, specific acupoints were added on the basis of syndrome differentiation and according to the scale for the differentiation of syndromes in vascular dementia (SDSVD) beside the acupoints used in the scalp electroacupuncture group. For the drug group, nimodipine was orally administered. Each patient was treated for two courses, eight weeks. The score differences in minimental state examination (MMSE), picture recognition, and clock drawing test were observed before and after the treatment. RESULTS: After treatment, the score differences in MMSE and clock drawing test were of obvious statistical significance among three groups (P0.05). There were statistical significant differences in therapeutic effects between the scalp electroacupuncture group and the drug group, and between the syndrome differentiation group and the drug group (P0.05). CONCLUSION: All the three therapies may improve the cognitive function of MCI patients. The therapeutic effects in the scalp electroacupuncture and syndrome differentiation groups were basically the same, but superior to nimodipine.

关键词： Memory disorders Electroacupunc-ture Nimodipine Picture recognition Clock draw-ing test

Designing all-solid-state Z-Scheme 2D g-C_3N_4/Bi_2WO_6 for improved photocatalysis and photocatalytic mechanism insight

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Green Energy & Environment 2018年第3期3卷 229-238页

作者： Mao Mao Shuowei Zhao zhigang chen Xiaojie She Jianjian Yi Kaixiang Xia Hui Xu Minqiang He Huaming Li School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu University Institute of Environmental Science

Bi_2WO_6 was modified by two-dimensional g-C_3N_4(2D g-C_3N_4)via a hydrothermal *** structure,morphology,optical and electronic properties were investigated by multiple techniques,including X-ray diffraction(XRD),X-ray photoelectron spectroscopy spectra(XPS),Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Ultravioletvisible diffuse reflection spectroscopy(DRS),photocurrent and electrochemical impedance spectroscopy(EIS),electron spin resonance(ESR),*** B(Rh B)was used as the target organic pollutant to research the photocatalytic performance of as-prepared *** Bi_2WO_6/2D g-C_3N_4exhibited a remarkable improvement compared with the pure Bi_2WO_*** enhanced photocatalytic activity was because the photogenerated electrons and holes can quickly separate by Z-Scheme passageway in *** photocatalytic mechanism was also researched in detail through ESR analysis.

关键词： All-solid-state Z-Scheme photocatalyst 2D g-C3N4 Bi2WO6 Photocatalysis

Topologically tuned terahertz confinement in a nonlinear photonic chip

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Light(Science & Applications) 2022年第6期11卷 1296-1303页

作者： Jiayi Wang Shiqi Xia Ride Wang Ruobin Ma Yao Lu Xinzheng Zhang Daohong Song Qiang Wu Roberto Morandotti Jingjun Xu zhigang chen The MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense Technology100071 BeijingChina Collaborative Innovation Center of Extreme Optics Shanxi University030006 TaiyuanShanxiChina INRS-EMT 1650 Blvd.Lionel-BouletVarennesQC J3X 152Canada

Compact terahertz(THz)functional devices are greatly sought after for high-speed wireless communication,biochemical sensing,and non-destructive ***,controlled THz generation,along with transport and detection,has remained a challenge especially for chip-scale devices due to low-coupling efficiency and unavoidable absorption ***,based on the topological protection of electromagnetic waves,we demonstrate nonlinear generation and topologically tuned confinement of THz waves in an engineered lithium niobate chip forming a wedge-shaped Su-Schrieffer-Heeger *** measured band structures provide direct visualization of the THz localization in the momentum space,while robustness of the confined mode against chiral perturbations is also analyzed and compared for both topologically trivial and nontrivial *** topological control of THz waves may bring about new possibilities in the realization of THz integrated circuits,promising for advanced photonic applications.

关键词： nonlinear realization wedge

Superhydrophilic Polydopamine‑Modified Carbon‑Fiber Membrane with Rapid Seawater‑Transferring Ability for Constructing Efficient Hanging‑Model Evaporator

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Advanced Fiber Materials 2023年第3期5卷 1063-1075页

作者： Wenmei Chong Ruru Meng Zixiao Liu Qiyue Liu Jinjing Hu Bo Zhu Daniel KMacharia zhigang chen Lisha Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China College of Environmental Science and Engineering Donghua UniversityShanghai 201620China

Solar-driven seawater desalination has attracted much attention for alleviating global freshwater shortage,but the practical application is often limited by complicated fabrication processes,unsatisfactory seawater-transferring and severe salt accu-mulation on the photothermal *** solve these problems,hydrophobic industrial-grade carbon fiber membrane(CFM)with good photoabsorption was surface-modified with polydopamine(PDA)to prepare superhydrophilic CFM@PDA for the construction of efficient hanging-model evaporators without salt *** coating of PDA on CFM is realized by simple self-polymerization of dopamine,and the as-prepared CFM@PDA exhibits high solar absorption effi-ciency of 96.7%,good photothermal effect and ***,when CFM@PDA is hanging between two water tanks(one contains seawater and the other is empty)in a flat hanging-model evaporator,it can transport seawater at a high rate(26.35 g/h)which is 3.6 times that(7.28 g/h)of commercial cotton *** simulated sunlight(1.0 kW m^(-2))irradiation,CFM@PDA shows a high evaporation rate of 1.79 kg m^(-2) h^(-1) with a solar evaporation efficiency of 92.6%.Even if NaCl solution with a high concentration(21.0 wt%)is used for the evaporation,the hanging CFM@PDA can retain a high evaporation rate(~1.80 kg m^(-2) h^(-1))without salt accumulation during the long-time test(8 h),which is significantly better than that of the tradition floating ***,this study not only demonstrates the simple preparation of super-hydrophilic CFM@PDA,but also promotes the further practical applications of hanging-model evaporators for continuous salt-free desalination.

关键词： Carbon fiber membrane Polydopamine Superhydrophilicity Hanging-model evaporator Solar-driven seawater desalination

On-demand assembly of polymeric nanoparticles for longer-blood-circulation and disassembly in tumor for boosting sonodynamic therapy

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Bioactive Materials 2022年第12期7卷 242-253页

作者： Mei Wen Nuo Yu Shiwen Wu Mengmeng Huang Pu Qiu Qian Ren Meifang Zhu zhigang chen State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China

Sonodynamic therapy (SDT) is one of the promising strategies for tumor therapy, but its application is usually hindered by fast clearance in blood-circulation, abnormal tumor microenvironment, and inefficient generation of reactive oxygen species. To solve these problems, we proposed an on-demand assembly-disassembly strategy, where the assembly is favorable for longer-blood-circulation and then the disassembly in tumor is favorable for boosting SDT. Hematoporphyrin monomethyl ether (HMME) as the model of organic sonosensitizers were conjugated with hyaluronic acid (HA). Then HA-HMME was mixed with catalase (CAT) and assembled into polymeric nanoparticles (CAT@HA-HMME NPs) with size of ~80 nm. CAT@HA-HMME NPs exhibit good biocompatibility and a longer blood half-time (t1/2 = 4.17 h) which is obviously longer than that (~0.82 h) of HMME molecules. After HA receptor-mediated endocytosis of cancer cells, CAT@HA-HMME NPs can be cleaved by endogenous hyaluronidase, resulting in the on-demand disassembly in tumor to release HA-HMME molecules and CAT. The CAT catalyzes the endogenous H_(2)O_(2) into O_(2) to relieve the hypoxic microenvironment, and the released HA-HMME exhibits a higher ROS generation ability, greatly boosting SDT for the inhibition of tumor growth. Therefore, the on-demand assembly-disassembly strategy may provide some insight in the design and development of nanoagents for tumor therapy.

关键词： Polymeric nanoparticles On-demand assembly Longer-blood-circulation On-demand disassembly Sonodynamic therapy

Geographical features and development models of estuarine cities

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Journal of Geographical Sciences 2024年第1期34卷 25-40页

作者： chen Mingxing XIAN Yue HUANG Yaohuan SUN zhigang WU chengbin Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resource and Environment University of Chinese Academy of SciencesBejing 100049China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Zhongke Shandong Dongying Institute of Geography Dongying 257509ShandongChina CAs Engineering Laboratory for Yellow River Delta Modern Agriculture Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

Cities are the key areas for human beings to achieve sustainable development goals in the *** cities are a special type of coastal city in urgent need of a clear *** paper proposed that estuarine cities are cities developed on the coast where rivers and oceans meet and defined four connotations,including the intersection of rivers and marine water systems,the coordinated development of land and oceans,the location advantages of connecting rivers and seas,and the important fragility of the ecological *** used Hydro SHEDS,OSM,GPW,and urban socioeconomic statistics and selected 50 estuarine cities with large rivers as representatives to summarize the main geographical basis and socioeconomic *** are primarily found in low-altitude,flat regions with average annual temperatures that mainly vary from 10℃to 25℃,relatively abundant precipitation,and extensive biological *** are substantial variations in the socioeconomic features of estuarine *** proposed eight development patterns,including open and inclusive city spirit,high-quality livable cities,high-quality development driven by innovation,integration of internal and external communication with ports and cities,construction of an international financial center,ecological environment protection and restoration,active promotion of cultural tourism,and positive international exchanges.

关键词： estuarine cities great rivers development models sustainability physical geography socioeconomy

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高速侵彻战斗部装药缓冲结构研究

弹箭与制导学报 2024年第4期44卷 72-81页

作者：赵一凡付建平杨芮石浩天陈智刚赵卫星付良康彦淑中北大学机电工程学院山西太原030051 中北大学智能武器研究院山西太原030051 中国兵器工业试验测试研究院陕西华阴714200 晋西工业集团有限责任公司山西太原030027

为研究典型缓冲结构和缓冲材料对超高速侵彻战斗部装药防护性能的影响,降低侵彻过程中强过载恶劣环境引发的装药响应,采用LS-DYNA对战斗部以1400 m/s速度正侵彻混凝土靶进行数值模拟。通过对弹体侵彻过程中无缓冲装药力学响应分析,确定... 详细信息

为研究典型缓冲结构和缓冲材料对超高速侵彻战斗部装药防护性能的影响,降低侵彻过程中强过载恶劣环境引发的装药响应,采用LS-DYNA对战斗部以1400 m/s速度正侵彻混凝土靶进行数值模拟。通过对弹体侵彻过程中无缓冲装药力学响应分析,确定了缓冲结构设计的方向,研究不同材料、厚度的缓冲块和缓冲层对装药环境的影响。结果表明:缓冲块对装药前段保护效果明显,能显著降低装药应力和过载峰值;缓冲层结构则更趋向于提升装药整体应力变化的一致性,使装药整体应力环境变化更加均匀。所选缓冲块结构以30 mm厚聚碳酸酯最优,能使装药过载和应力峰值分别降低20%和34%;缓冲层结构以4 mm厚聚四氟乙烯最优,装药过载和应力峰值分别降低19%和9%。为高速侵彻战斗部装药缓冲结构防护提供一定参考。

关键词：侵彻缓冲材料缓冲结构数值模拟装药应力

The impact of nanoporous SiN_x interlayer growth position on high-quality GaN epitaxial films

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Chinese Science Bulletin 2011年第25期56卷 2739-2743页

作者： MA ZiGuang XING zhigang WANG XiaoLi chen Yao XU PeiQiang CUI YanXiang WANG Lu JIANG Yang JIA HaiQiang chen Hong Beijing National Laboratory of Condensed Matter Institute of Physics Chinese Academy of Sciences Beijing 100190 China

The impact of nanoporous SiN x interlayer growth position on high-quality GaN epitaxial film was elucidated from the behavior of dislocations. The best quality GaN film was achieved when a nanoporous SiN x interlayer was grown on a rough layer, with the high-resolution X-ray diffraction rocking curve full width at half maximum for ( 1102 ) reflection decreasing to 223 arcs, and the total dislocation density reduced to less than 1.0×10 8 cm 2 . GaN films were grown on sapphire substrates by metal organic chemical vapor deposition. The quality of these films was investigated with high-resolution X-ray diffraction, atomic force microscopy, and cross-sectional transmission electron microscopy. A preference for the formation of half-loops to reduce threading dislocations was observed when an SiN x interlayer was grown on a rough layer. A growth mechanism is proposed to explain this preference.

关键词：氮化硅外延片多孔层间氮化镓 GaN薄膜化学气相沉积法透射电子显微镜