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Electromagnetic wave absorption performance of Ti_(2)O_(3)and vacancy enhancement effective bandwidth

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Journal of Materials Science & Technology 2021年第17期76卷 166-173页

作者： xiankai fu Bo Yang Wanqi Chen Zongbin Li Haile Yan Xiang Zhao Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and Engineering.Northeastern UniversityShenyang110819China

The microwave absorption properties of Ti_(2)O_(3)were systematically *** results indicate that Ti_(2)O_(3)has microwave absorption performance with a minimum reflection loss value of-37.6 d B at 18.6 GHz and an effective absorption bandwidth(RL<-10 d B)of 2 ***,vacancy defects were introduced into Ti_(2)O_(3)by carbothermal ***,the effective absorption bandwidth of Ti_(2)O_(3)with vacancy defects reach 3.2 ***-principles calculations provide evidence that vacancy defects result in the changes of electric dipole state,leading to a wider effective absorption *** results have significance in understanding the origin of electromagnetic phenomena and developing electromagnetic wave absorption materials.

关键词： Ti_(2)O_(3) Microwave absorption Vacancy Electric dipoles First-principles

Visual observation of photonic Floquet–Bloch oscillations

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Light(Science & Applications) 2024年第5期13卷 921-929页

作者： Zhen Zhang Yuan Li xiankai Sun Xuewen Shu Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhanHubei 430074China Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina

Bloch oscillations(BOs),an important transport phenomenon,have been studied extensively in static systems but remain mysterious in Floquet ***,by harnessing notions from photonic analogy,we propose a generalization of the existing BOs in photonic Floquet lattices,namely the“photonic Floquet–Bloch oscillations”,which refer to rescaled photonic Bloch oscillations with a period of extended least common multiple of the modulation period and the Bloch oscillation ***,we report the first visual observation of such photonic Floquet–Bloch oscillations(FBOs)by employing waveguide fluorescence *** significantly,the FBOs surpass the existing BOs in Floquet systems and exhibit exotic properties on their own,including fractal spectrum and fractional Floquet *** new transport mechanism offers an intriguing method of wave manipulation that may contribute to rapidly developing fields in photonics,condensed matter physics,and quantum physics.

关键词： Bloch analogy generalization

Integrated bound-state-in-the-continuum photon-pair source

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Photonics Research 2024年第6期12卷 1322-1327页

作者： FAN YE YUE QIN CHENFEI CUI xiankai SUN HON KI TSANG Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Integrated photon-pair sources based on spontaneous parametric down conversion(SPDC)in novel high-χ^((2))materials are used in quantum photonic systems for quantum information processing,quantum metrology,and quantum ***,the need for extensive fabrication process development and optimization of dry-etching processes significantly impedes the rapid exploration of different material platforms for low-loss quantum photonic ***,bound states in the continuum(BICs)have emerged as a promising approach for realizing ultralow-loss integrated photonic circuits without requiring an etching *** realizations of BIC photonic circuits have,however,been limited primarily to the classical ***,we explore the BIC phenomena in the quantum regime and show that the etchless BIC platform is suitable for use in integrated entangled photon-pair sources based on the SPDC process in high-χ^((2))*** lithium niobate as an example,we demonstrate photon-pair generation at telecommunication wavelengths,attaining a maximum internal generation rate of 3.46 MHz,a coincidence-to-accidental ratio of 5773,and an experimental two‐photon interference visibility of 94%.Our results demonstrate that the BIC platform can be used for quantum photonic circuits,and this will enable the rapid exploration of different emergingχ^((2))materials for possible use in integrated quantum photonics in the future.

关键词： process quantum continuum

MOF-based materials facilitate efficient anaerobic digestion of organic wastes:integrating substrate bioavailability and microbial syntrophism

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 153-157页

作者： Haoyu Liu Ying Xu Xiang Chen xiankai Wang Hang Wang Xiaohu Dai State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China YANGTZE Eco-Environment Engineering Research Center China Three Gorges CorporationWuhan 430010China National Engineering Research Center of Eco-Environment Protection for Yangtze River Economic Belt Wuhan 430010China

Anaerobic digestion(AD)of organic waste(OW)for methane production is generally *** of AD systems with traditional materials(e.g.,electroconductive materials)is a current focus of research and has been reported to assist methanogenesis by enhancing the productivity of microbial metabolism among syntrophic *** in the AD of organic wastewater,in which microbial cells come into direct contact with the dissolved substrate,in the complex multiphase AD system of OW,low substrate bioavailability is an inevitable obstacle to microbial syntrophism for ***,we propose that improving substrate bioavailability and microbial syntrophism is a powerful strategy for ensuring material-assisted efficient AD of *** on the above considerations,metal-organic frameworks(MOFs),with their exceptionally high porosity,outstanding multi-functionality,and tuneable structures,have excellent potential for application in multiphase anaerobic systems of OW to integrate substrate bioavailability and microbial syntrophism and drive efficient *** addition,MOFs with designable and tuneable natures have great potential for use in identifying suitable materials for anaerobic systems for different types of OW via machine-learning technologies,thereby effectively enhancing methanogenesis from ***,the sustainable application of MOFs in AD and the corresponding environmental risks warrant further investigation.

关键词： Anaerobic digestion Methane production Biodegradability functional materials Metal-organic frameworks

Subtropical forest macro-decomposers rapidly transfer litter carbon and nitrogen into soil mineral-associated organic matter

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Forest Ecosystems 2024年第2期11卷 131-139页

作者： Guoxiang Niu Tao Liu Zhen Zhao Xuebing Zhang Huiling Guan Xiaoxiang He xiankai Lu National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China Central South University of Forestry and TechnologyChangsha410004China Lushan Botanical Garden Chinese Academy of SciencesJiujiang332900China Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou510650China Section of Microbial Ecology Department of BiologyLund UniversityLund22362Sweden Lutou National Station for Scientific Observation and Research of Forest Ecosystem in Hunan Province Yueyang414000China

Background:Forest soils in tropical and subtropical areas store a significant amount of *** framework to assess soil organic matter(SOM)dynamics under evolving global conditions suggest that dividing bulk SOM into particulate and mineral-associated organic matter(POM ***)is a promising method for identifying how SOM contributes to reducing global *** macrofauna,earthworms,and millipedes have been found to play an important role in facilitating SOM ***,how these two co-existing macrofaunae impac the litter decomposition process and directly impact the formation of POM and MAOM remains ***:Here,we set up a microcosm experiment,which consisted of 20 microcosms with four treatments earthworm and litter addition(E),millipedes and litter addition(M),earthworm,millipedes,and litter addition(E+M),and control(only litter addition)in five *** soil and litter were sterilized prior to beginning the incubation experiment to remove any existing *** incubating the samples for 42 days,the litte properties(mass,C,and N contents),soil physicochemical properties,as well as the C and N contents,and POM and MAOM^(13)C abundance in the 0–5 and 5–10 cm soil layers were ***,the relative influences o soil physicochemical and microbial properties on the distribution of C and N in the soil fractions were analyzed Results:The litter mass,C,and N associated with all four treatments significantly decreased after incubation especially under treatment E+M(litter mass:-58.8%,litter C:-57.0%,litter N:-75.1%,respectively),while earthworm biomass significantly decreased under treatment *** or millipede addition alone showed no significant effects on the organic carbon(OC)and total nitrogen(TN)content in the POM fraction,but join addition of both significantly increased OC and TN regardless of soil ***,all three macrofauna treatments increased the OC and TN content and decreased the^(13)C abundance

关键词： Tropical and subtropical forest Soil organic matter fractions Earthworm Millipedes Litter decomposition

In-situ sludge reduction based on Mn^(2+)-catalytic ozonation conditioning:Feasibility study and microbial mechanisms

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Journal of Environmental Sciences 2024年第1期135卷 185-197页

作者： Haozhe Huang Tingting Wei Hui Wang Bing Xue Sisi Chen xiankai Wang Haibin Wu Bin Dong Zuxin Xu College of Environmental Science and Engineering Tongji UniversityShanghai 200092China YANGTZE Eco-Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China

To improve the sludge conditioning efficiency without increasing the ozone dose,an in-situ sludge reduction process based on Mn^(2+)-catalytic ozonation conditioning was *** ozone conditioning alone as a control,a lab-scale sequencing batch reactor coupled with ozonated sludge recycle was evaluated for its operating performance at an ozone dose of 75 mg O_(3)/g VSS and 1.5 mmol/L Mn^(2+)*** results showed a 39.4%reduction in MLSS and an observed sludge yield of 0.236 kg MLSS/kg COD for the O_(3)+Mn^(2+)group compared to the O_(3)group (15.3%and 0.292 kg MLSS/kg COD),accompanied by better COD,NH_(4)^(+)-N,TN and TP removal,improved effluent SS and limited impact on excess sludge ***,activity tests,BIOLOG ECO microplates and 16S rRNA sequencing were applied to elucidate the changing mechanisms of Mn^(2+)-catalytic ozonation related to microbial action:(1) Dehydrogenase activity reached a higher peak.(2) Microbial utilization of total carbon sources had an elevated effect,up to approximately 18%,and metabolic levels of six carbon sources were also increased,especially for sugars and amino acids most pronounced.(3) The abundance of Defluviicoccus under the phylum Proteobacteria was enhanced to 12.0%and dominated in the sludge,they had strong hydrolytic activity and metabolic *** bacteria of the genus Ferruginibacter also showed an abundance of 7.6%,they contributed to the solubilization and reduction of sludge *** results could guide researchers to further reduce ozonation conditioning costs,improve sludge management and provide theoretical support.

关键词： Activated sludge In-situ reduction Catalytic ozonation conditioning Dehydrogenase activity Carbon source utilization Microbial community

TiO_2光催化剂的掺杂改性及应用研究进展

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化工新型材料 2016年第1期44卷 15-18页

作者：王家恒宫长伟付现凯焦俊荣柴跃生太原科技大学材料科学与工程学院太原030024

国内外关于纳米TiO_2光催化剂有着广泛的研究和应用。离子掺杂能拓宽TiO_2光谱吸收范围,有效改善其光催化活性。综述了离子掺杂改性纳米TiO_2光催化剂的研究进展,分析了金属离子掺杂、非金属离子掺杂、多种不同离子共掺杂的掺杂机理及对... 详细信息

国内外关于纳米TiO_2光催化剂有着广泛的研究和应用。离子掺杂能拓宽TiO_2光谱吸收范围,有效改善其光催化活性。综述了离子掺杂改性纳米TiO_2光催化剂的研究进展,分析了金属离子掺杂、非金属离子掺杂、多种不同离子共掺杂的掺杂机理及对TiO_2光催化性能的影响,介绍了纳米TiO_2光催化剂在污水处理中的应用现状。最后指出离子掺杂TiO_2和纳米TiO_2光催化剂在污水降解中存在的问题,并对今后的研究方向做了展望。

关键词： TiO2 离子掺杂光催化剂污水降解

希伯来文版《红楼梦》翻译研究:从语义对比到文化交流

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曹雪芹研究 2024年第3期 95-109页

作者：任显楷西南交通大学外国语学院

浦安迪与柯阿米拉合作翻译的希伯来文版《红楼梦》为当前学界唯一的希语版《红楼梦》译本。本文以该译本为研究对象,选取其中有代表性的译文进行语义对比,揭示中文原文与希伯来文译文之间的异同以及造成这种异同背后的文化因素。在这一... 详细信息

浦安迪与柯阿米拉合作翻译的希伯来文版《红楼梦》为当前学界唯一的希语版《红楼梦》译本。本文以该译本为研究对象,选取其中有代表性的译文进行语义对比,揭示中文原文与希伯来文译文之间的异同以及造成这种异同背后的文化因素。在这一文本分析的基础上,本文进一步联系译者目的和中希文化,阐明希伯来文版《红楼梦》翻译研究的问题意识立足于希伯来文化传统的独特性,由此观照中希文化交流则是该研究最核心的学术价值。

关键词：红楼梦希伯来文版语义对比文化交流

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煤矿综合机械化快速掘进技术要点分析

山西焦煤科技 2024年第4期48卷 53-54页

作者：郭贤凯山西兰花科技创业股份有限公司唐安煤矿分公司山西晋城048400

为提高煤矿巷道的掘进速度和效率,分析了煤矿综合机械化快速掘进技术,探讨了影响掘进速度的关键因素及快速掘进的技术要点,提出实现快速掘进的策略,采用高性能的掘进设备结合有效的支护技术和优化的通风安全系统能显著提高掘进速度。

关键词：煤矿机械化快速掘进