检索结果-内蒙古大学图书馆

Chemical bond parameters and microwave dielectric properties of CaLaAl3O7 ceramics with layer structure

Ceramics International 2025年第15期51卷 20798-20804页

作者： Yang, Hongcheng Huang, Xier Zheng, Yixuan Zhang, Jin Li, Enzhu School of New Energy and Materials Southwest Petroleum University Chengdu610500 China National Engineering Research Center of Electromagnetic Radiation Control Materials and Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu610054 China

Sintered at 1575 °C, the single phase CaLaAl3O7 ceramics were obtained and investigated on the sensitivity of chemical bond to the stability of layer structure. LaAlO3 and CaAl2O4 are the secondary phases in the sintering temperature range of 1350∼1550 °C, contributing to the variation of relative density, dielectric constant and quality factors. As a candidate of microwave dielectric ceramics of aluminate, pure CaLaAl3O7 possesses the microwave dielectric properties of ɛr = 6.26, Q × f = 22750 GHz, τf = −39.8 ppm/°C. Based on the calculation of chemical bond traits and cation polarization, modification of Ca/La site may have primary influence on ɛr. Al(1)-O and Al(2)-O bonds make mainly contribution on lattice energy and bond energy, indicating [AlO4] frame paly crucial role on crystal structure stability. It is prior to design substitution for Al to adjust the layer structure and optimize the dielectric loss for CaLaAl3O7 ceramics. The systematical results of this study establish that determination of contributions of chemical bond to structure stability is a key dial for tuning crystal structure and properties in ternary aluminate solids. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Aluminum oxide

来源：评论

学校读者我要写书评

暂无评论

Using kin discrimination to construct synthetic microbial communities of Bacillus subtilis strains impacts the growth of black soldier fly larvae

引用

Insect science 2024年第6期31卷 1943-1959页

作者： Jun-Hui Zhao Ping Cheng Yi Wang Xun Yan Zhi-Min Xu Dong-Hai Peng Guo-Hui Yu Ming-Wei Shao Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China Ministry of Agriculture and Rural AffairsGuangdong University Key Laboratory for Sustainable Control of Fruit and Vegetable Diseases and PestsInnovative Institute for Plant HealthCollege of Agriculture and BiologyZhongkai University of Agriculture and EngineeringGuangzhouChina State Key Laboratory of Agricultural Microbiology National Engineering Research Center of Microbial PesticidesCollege of Life Science and TechnologyHuazhong Agricultural UniversityWuhanChina Hubei Hongshan Laboratory WuhanChina College of Resources and Environment Zhongkai University of Agriculture and EngineeringGuangzhouChina

Using synthetic microbial communities to promote host growth is an effective ***,the construction of such communities lacks theoretical *** discrimination is an effective means by which strains can recognize themselves from non-self,and construct competitive microbial communities to produce more secondary ***,the construction of cooperative communities benefits from the widespread use of beneficial *** used kin discrimination to construct synthetic communities(SCs)comprising 13 Bacillus subtilis strains from the surface and gut of black soldier fly(BSF)*** assessed larval growth promotion in a pigeon manure system and found that the synthetic community comprising 4 strains(SC 4)had the most profound *** analyses of these 4 strains revealed that their complementary functional genes underpinned the robust functionality of the cooperative synthetic community,highlighting the importance of strain *** analyzing the bacterial composition of BSF larvae and the pigeon manure substrate,we observed that SC 4 altered the bacterial abundance in both the larval gut and pigeon *** also influenced microbial metabolic functions and co-occurrence network *** discrimination facilitates the rapid construction of synthetic *** positive effects of SC 4 on larval weight gain resulted from the functional redundancy and complementarity among the ***,SC 4 may enhance larval growth by inducing shifts in the bacterial composition of the larval gut and pigeon *** elucidated how the SC promoted larval growth by regulating bacterial composition and provided theoretical guidance for the construction of SCs.

关键词： community construction genomic analysis gut bacteria pigeon manure

来源：评论

学校读者我要写书评

暂无评论

Temporal patterns of algae in different urban lakes and their correlations with environmental variables in Xi’an,China

引用

Journal of Environmental sciences 2023年第11期133卷 138-151页

作者： Shengnan Chen Hanyan Liu Haihan Zhang Kai Li Na Wang Weimin Sun Xiang Liu Limin Niu Ben Ma Fan Yang Haiyun Li Daijuan Zhao Yan Xing Shaanxi Key Laboratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Shaanxi Environmental Monitoring Center Xi’an 710054China

Urban lakes were critical in aquatic ecology environments,but how environmental factors affected the distribution and change characteristics of algal communities in urban lakes of Xi’an city was not ***,we investigated the algal community structure of six urban lakes in Xi’an and evaluated the effects of water quality parameters on *** results indicated that the significant differences on physicochemical parameters existed in different urban *** maximum concentration of total phosphorus in urban lakes was(0.18±0.01)mg/L and there was a phenomenon of phosphorus *** addition,51 genera of algae were identified and Chlorella *** the dominant algal species,which was affiliated with *** analysis elucidated that each lake had a unique algal community network and the positive correlation was dominant in the interaction between algae species,illustrating that mature microbial communities existed or occupied similar *** analysis illustrated that environmental factors explained 47.35% variance of algal species-water quality correlation collectively,indicating that water quality conditions had a significant influence on the temporal variations of *** equation model further verified that algal community structure was directly or indirectly regulated by different water quality *** study shows that temporal patterns of algal communities can reveal the dynamics and interactions of different urban ecosystem types,providing a theoretical basis for assessing eutrophication levels and for water quality management.

关键词： Urban lakes Algal community structure Network analysis Species interaction pattern Structural equation model

来源：评论

学校读者我要写书评

暂无评论

Efficient Photothermal Catalytic Oxidation Enabled by Three-Dimensional Nanochannel Substrates

引用

Environmental science and technology 2024年第11期58卷 5153-5161页

作者： Li, Yifei Zhang, Qianpeng Chong, Yanan Huang, Wei-Hsiang Chen, Chi-Liang Jin, Xiaojing Chen, Guangxu Fan, Zhiyong Qiu, Yongcai Ye, Daiqi School of Environment and Energy State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of Technology Guangdong Guangzhou510000 China State Key Laboratory of Photovoltaic Science and Technology Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of Optoelectronics Fudan University Shanghai200433 China Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon999077 Hong Kong State Key Laboratory of Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and Technology Clear Water Bay Kowloon999077 Hong Kong National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsinchu30076 Taiwan Taipei10607 Taiwan College of Light Chemical Industry and Materials Engineering Shunde Polytechnic Foshan528333 China

Photothermal catalysis exhibits promising prospects to overcome the shortcomings of high-energy consumption of traditional thermal catalysis and the low efficiency of photocatalysis. However, there is still a challenge to develop catalysts with outstanding light absorption capability and photothermal conversion efficiency for the degradation of atmospheric pollutants. Herein, we introduced the Co3O4 layer and Pt nanoclusters into the three-dimensional (3D) porous membrane through the atomic layer deposition (ALD) technique, leading to a Pt/Co3O4/AAO monolithic catalyst. The 3D ordered nanochannel structure can significantly enhance the solar absorption capacity through the light-trapping effect. Therefore, the embedded Pt/Co3O4 catalyst can be rapidly heated and the O2 adsorbed on the Pt clusters can be activated to generate sufficient O2- species, exhibiting outstanding activity for the diverse VOCs (toluene, acetone, and formaldehyde) degradation. Optical characterization and simulation calculation confirmed that Pt/Co3O4/AAO exhibited state-of-the-art light absorption and a notable localized surface plasmon resonance (LSPR) effect. In situ diffuse reflectance infrared Fourier transform spectrometry (in situ DRIFTS) studies demonstrated that light irradiation can accelerate the conversion of intermediates during toluene and acetone oxidation, thereby inhibiting byproduct accumulation. Our finding extends the application of AAO’s optical properties in photothermal catalytic degradation of air pollutants. © 2024 American Chemical Society.

关键词： Catalysis

来源：评论

学校读者我要写书评

暂无评论

Ultrathin RCS Reduction Metasurface Based on Integer and Fractional Vortex Waves

Ultrathin RCS Reduction Metasurface Based on Integer and Fra...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Liu, Qian Liang, Difei Chen, Haiyan Han, Tiancheng Yao, Xin He, Qingting Wang, Xiaodi Wen, Shuntian Xue, Zhichao University of Electronic Science and Technology of China National Engineering Research Center of Electromagnetic Radiation Control Materials Chengdu China University of Electronic Science and Technology of China Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education Chengdu China

ISBN: (纸本)9798350375909

In this paper, an ultrathin radar cross section (RCS) reduction metasurface is designed and realized by reflection-type vortex waves with various topological charges. Due to the singularity of the OAM characteristics, a significant RCS reduction is obtained at the operating frequency of 14GHz. Based on the fact that fractional-order vortex waves have unique radial amplitude zeros in addition to amplitude zero in the center, the monostatic RCS reduction characterization of fractional-order vortex metasurface is also mainly discussed. By analyzing the orbital angular momentum spectrum of different fractional vortex waves and field variation, the singularity range can be effectively manipulated so that the singularity is transmitted in the radial direction. The simulated results demonstrate that different OAM modes can be generated, and the monostatic RCS reduction over 30dB can be obtained at 14GHz under the normal incidence of the plane wave. Moreover, the thickness of the proposed RCS reduction metasurface is about 0.05 wavelength of the operation resonant frequency, which indicates that the metasurfaces have the characteristic of ultrathin. The far-field features of these metasurfaces show that they have prospective application value in scattering control technology. © 2024 IEEE.

关键词： Radar cross section

来源：评论

学校读者我要写书评

暂无评论

A Semantic Interpretation Method for Deep Neural Networks Based on Knowledge Graphs

A Semantic Interpretation Method for Deep Neural Networks Ba...

引用

2022 Chinese Automation Congress, CAC 2022

作者： Liu, Jingjing Xu, Song Wang, Lina Beijing Aerospace Control Institute National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing China

ISBN: (纸本)9781665465335

Despite the great success of deep neural networks in many fields, the lack of interpretability has severely limited their wide application in security-sensitive tasks. Although current interpretable methods of deep neural networks such as visualization, class activation mapping, and sensitivity analysis can help users intuitively understand the inner working mechanism of the neural networks to some extent, they are either too coarse in explanation or too complex in explanation form to read easily. In order to use semantic information which is more understandable and close to human thought to interpret the deep neural network and increase the readability of the interpretation,we propose a semantic interpretation method of deep neural network based on knowledge graph. The method takes the VGG16 network as an example, and by mining the key neuronsof the neural network, construct semantic dictionaries and knowledge maps of key neurons, and automatically generate human-understandable semantic explanatory statements based on the knowledge maps. The method provides a new idea to improve the transparency of the operation process of deep neural networks, and also provides a clearer reference basis for pruning and tuning of deep neural networks. © 2022 IEEE.

关键词： Deep neural networks

来源：评论

学校读者我要写书评

暂无评论

A review from fundamental research to device applications for graphene-based thermal rectifier

DeCarbon

引用

DeCarbon 2024年第2期4卷 1-35页

作者： Hengbin Ding Jiarui He Liming Ding He Tian School of Integrated Circuits Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084China CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing 100190 China

Thermal rectification(TR)is a phenomenon akin to electrical *** has a high thermal conductivity(k)in one direction,enabling efficient heat dissipation,as well as a low k in the opposite direction,impeding heat *** the rapid development of nanotechnology in recent years,the active control and regulation of heat conduction on the nanoscale has become a critical ***,a prominent two-dimensional(2D)material,is highly regarded for its exceptional thermal transport *** have been studies and achievements both theoretically and experimentally since its *** this review,we establish a bridge between fundamental research and application studies for graphene-based thermal rectifier as ***,we summarize the established 2D heat conduction theories and low-dimensional simulation ***,we review the progress of experimental techniques and device structures based on 2D theories for graphene-based thermal ***,we discuss several applications of thermal rectifier,including thermal logic circuits and thermoelectric power generation ***,we present the potential applications of graphene-based thermal rectifiers previously unexplored,such as microelectronic thermal management and thermal decoupling for flexible *** hope that advancements in morphology and fabrication techniques will lead to widespread use of graphene-based thermal rectifiers in various thermal systems to solve diverse thermal management problems in the near future.

关键词： Graphene Thermal rectification Fundamental research Application studies

来源：评论

学校读者我要写书评

暂无评论

Progress and challenge of functional single-atom catalysts for the catalytic oxidation of volatile organic compounds

引用

Chinese Chemical Letters 2024年第9期35卷 83-91页

作者： Zeyu Jiang Yadi Wang Changwei Chen Chi He Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China National Engineering Laboratory for VOCs Pollution Control Material&Technology University of Chinese Academy of SciencesBeijing 101408China

The catalytic oxidation of volatile organic compounds(VOCs)is of considerable significance for the sustainable development of the chemical industry;thus,considerable efforts have been devoted to the exploration of efficient catalysts for use in this *** this regard,the development and utilization of single-atom catalysts(SACs)in VOCs decomposition is a rapidly expanding research *** can be employed as potential catalysts for oxidizing VOC molecules due to their optimal utilization efficiency,unique atomic bonding structures,and unsaturated *** has been achieved,while the challenges surrounding precise regulation of the microstructures of SACs for improving their low-temperature efficiency,stability,and product selectivity under practical conditions are ***,elucidating structure-performance relationships and establishing intrinsic modulating mechanisms are urgently required for guiding researchers on how to synthesize effective and stable functional SACs ***,recent advances in the design and synthesis of functional SACs for application in the catalytic oxidation of VOCs are *** experimental and theoretical studies revealing higher efficiency,stability,and selectivity of as-prepared functional SACs are being ***,the future perspectives in terms of promising catalysts with multi-sized composite active sites and the illustration of intrinsic mechanism are *** rapid intelligent screening of applicable SACs and their industrial applications are also discussed.

关键词： Single-atom catalysts VOCs catalytic oxidation Hydrocarbon activation Oxygen species transformation Surface chemistry Intrinsic mechanism

来源：评论

学校读者我要写书评

暂无评论

Boosting C_(2)H_(6)/C_(2)H_(4) separation via the precise electrostatic modulation of synthetic 1D channel at atomic level

引用

Nano Research 2024年第11期17卷 10083-10087页

作者： Salamanti Ainiwaner Hengcong Huang Jia-Jia Zheng Fengting Li Xue-Tong Yang Yang-Yang Guo Fangli Yuan Ming-Shui Yao Yifan Gu College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Laboratory of Theoretical and Computational Nanoscience National Center for Nanoscience and Technology Chinese Academy of Sciences Beijing 100190 China Skate Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing 100049 China

The regulation of gas sorption via simple pore modification is crucial to molecular recognition and chemical ***,a rational pore surface electrostatic modulation in synthetic one dimensioned(1-D)channel is demonstrated to boost ethane/ethylene(C_(2)H_(6)/C_(2)H_(4))selectivity for one-step extraction of C_(2)H_(4) from C_(2)H_(6)/C_(2)H_(4) *** the precise modulation of the surface charge arrangement with negatively charged moieties in the 1-D channel of a metal—organic framework(MOF),enhanced C_(2)H_(6)—host framework and decreased C_(2)H_(4)—host framework electrostatic interactions were obtained,which resulted in an obvious improvement in adsorption ***,the breakthrough separation performance rendered the obtained MOF an efficient adsorbent for C_(2)H_(4) purification from C_(2)H_(6)/C_(2)H_(4) *** combined detail theoretical studies prove that the gas sorption selectivity is remarkably sensitive to framework electrostatic change even in the case of pore surface modification at the atomic *** results are of fundamental importance to the design of porous materials for challenging separation tasks.

关键词： metal—organic framework ethane/ethylene separation ethane—selective MOF adsorption electrostatic modulation

来源：评论

学校读者我要写书评

暂无评论

Recent progress of radionuclides separation by porous materials

引用

science China Chemistry 2024年第11期67卷 3515-3577页

作者： Yinghui Xie Long Yu Long Chen Cheng Chen Li Wang Fenglei Liu Yun Liao Peng Zhang Tao Chen Yihui Yuan Yuexiang Lu Boyang Huang Hui Yang Suhua Wang Shuao Wang Lijian Ma Feng Luo Yunhai Liu Baowei Hu Hongqing Wang Duoqiang Pan Wenkun Zhu Ning Wang Zhe Wang Liang Mao Shengqian Ma Xiangke Wang Guangdong Provincial Key Laboratory for Green Agricultural Production and Intelligent Equipment School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaoming 525000China School of Life Science Shaoxing UniversityShaoxing 312000China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China College of Chemistry Sichuan UniversityChengdu 610064China School of Chemistry and Materials Science East China University of TechnologyNanchang 330013China School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China State Key Laboratory of Environment-friendly Energy Materials National Co-innovation Center for Nuclear Waste Disposal and Environmental SafetySichuan Civil-military Integration InstituteSchool of National Defence&Nuclear Science and TechnologySouthwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Marine Resource Utilization in South China Sea Collaborative Innovation Center of Marine Science and TechnologyHainan UniversityHaikou 570228China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210093China Department of Chemistry University of North TexasDentonTX 76201USA

The separation of radionuclides is critical for the sustainable development of nuclear energy. It is urgent to design and prepare functionalized materials for efficient radionuclides separation. Porous materials are considered excellent candidates for the separation of radionuclides under complex conditions due to their high specific surface areas, tunable pore structures and controllable functionalities. In this review, we summarized the design, preparation and functionalization of porous materials and their application for separation of radionuclides in the past five years, discussed the separation performance and analyzed the structure-activity relationship between various radionuclides and porous materials, and systematically clarified their characterization and mechanism of different type porous materials. We also introduced the detection, irradiation and chemical toxicity of different reflective radionuclides.

关键词： porous materials radionuclides detection separation radiotoxicity interaction mechanism

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：