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Boosting ammonia production in electrocatalytic NO_(x)reduction on a robust Fe/FeMoO_(4)catalyst

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Nano Research 2024年第7期17卷 5801-5806页

作者： Dong-Xue Liu Xin Deng Yong-Fu Zhu zhe meng Xue-Feng Sun Miao-Miao Shi Hai-Xia Zhong Jun-Min Yan Key Laboratory of Automobile Materials Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Electrocatalytic reduction of nitrate(NO_(3)^(−))and nitride(NO_(2)^(−))to ammonia(NH3)is of wide interest as a promising alternative to the energy-intensive Haber-Bosch route for mitigating the vast energy consumption and the accompanied carbon dioxide emission,as well as benefiting for the relevant sewage ***,exploring an efficient and low-cost catalyst with high atomic utilization that can effectively facilitate the slow multi-electron transfer process remains a grand ***,we present an efficient hydrogenation of NO_(3)^(−)/NO_(2)^(−)species to NH3 in both alkaline and neutral environments over the Fe_(2)(MoO_(4))_(3)derived hybrid electrocatalyst with the metallic Fe site on FeMoO_(4)(Fe/FeMoO_(4)).The Mo ingredient can play a synergistically positive role in further promoting the NH_(3) production on *** a result,Fe/FeMoO_(4)behaves well in the electrochemical NH_(3) generation from NO_(2)^(−)with a maximum NH_(3) Faradaic efficiency(FE)of 96.53%and 87.68%in alkaline and neutral electrolyte,corresponding to the NH_(3) yield rate of 640.68 and 302.56 mg·h^(−1)·mg_(cat.)^(−1),respectively,which outperforms the Fe and Mo counterpart and other similar catalyst,showing the robust catalytic capacity of each active site.

关键词： ammonia synthesis NO_(x)reduction synergistic effect alkaline/neutral electrolyte

Influence of confined water on the limit support pressure of tunnel face in weakly water-rich strata

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Journal of Central South University 2024年第8期31卷 2844-2859页

作者： Li, Yun-fa Wu, Guo-jun Chen, Wei-zhong Yuan, Jing-qiang Huo, meng-zhe State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China University of Chinese Academy of Sciences Beijing China

In the process of shield tunneling through soft soil layers, the presence of confined water ahead poses a significant threat to the stability of the tunnel face. Therefore, it is crucial to consider the impact of confined water on the limit support pressure of the tunnel face. This study employed the finite element method (FEM) to analyze the limit support pressure of shield tunnel face instability within a pressurized water-containing layer. Subsequently, a multiple linear regression approach was applied to derive a concise solution formula for the limit support pressure, incorporating various influencing factors. The analysis yields the following conclusions: 1) The influence of confined water on the instability mode of the tunnel face in soft soil layers makes the displacement response of the strata not significant when the face is unstable; 2) The limit support pressure increases approximately linearly with the pressure head, shield tunnel diameter, and tunnel burial depth. And inversely proportional to the thickness of the impermeable layer, soil cohesion and internal friction angle; 3) Through an engineering case study analysis, the results align well with those obtained from traditional theoretical methods, thereby validating the rationality of the equations proposed in this paper. Furthermore, the proposed equations overcome the limitation of traditional theoretical approaches considering the influence of changes in impermeable layer thickness. It can accurately depict the dynamic variation in the required limit support pressure to maintain the stability of the tunnel face during shield tunneling, thus better reflecting engineering reality.

关键词： weakly water-rich strata confined aquifer limit support pressure finite element method multiple linear regression

Engineering neuroregenerative microenvironment via aligned hydrogel-assisted magnetic stimulation for complete spinal cord injury repair

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Engineered Regeneration 2024年第2期5卷 139-152页

作者： Chun-Yi Yang zhe meng Zhijun He Pengchao Ma Zhaohui Hou Kunkoo Kim Jingsong Lu Kaiyuan Yang Guihuai Wang Xiumei Wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Neurosurgery Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing102218China

Utilizing biomaterials in tissue engineering has shown considerable promise for tissue regeneration,particularly through delivering multimodel cell-regulatory signals,including the material-related signals and extrinsic *** this research,we developed a magnetic-responsive aligned nanofiber fibrin hydrogel(MAFG),integrating the structured alignment of nanofibers and the pliability of fibrin hydrogel with an external magnetic *** design aimed to enhance the regenerative response in spinal cord injury treatment.A medium-strength magnetic field,aligned with the spinal cord,was applied to aid motor function recovery in rats with spinal cord *** use of MAFG in this context not only intensified the effect of the magnetic field but also encouraged the activation and differentiation of native neural stem ***,this method effectively steered macrophage polarization towards a beneficial M2 phenotype,addressing immune dysregulation at the injury *** parallel application of magnetic field stimulation through MAFG in a spinal cord injury model contributed to the concurrent promotion of neurogenesis,angiogenesis,and immunomodulation,resulting in marked improvement in motor function in *** investigation underscores the therapeutic potential of magnetic field stimulation and highlights how aligning this stimulation with the spinal cord can significantly enhance the regenerative milieu at the injury site.

关键词： Angiogenesis Neurogenesis Immunomodulation Magnetic-responsive hydrogel Magnetic stimulation

Corrosion behavior of 2A97 Al-Cu-Li alloys in different thermomechanical conditions by quasi-in-situ analysis

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2772-2786页

作者： You Lü Xiang-zhe meng Yan-yan LI Ze-hua DONG Xin-xin ZHANG Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As a promising material in the aircraft industry,2A97 Al-Cu-Li alloy exhibits high corrosion susceptibility that may limit its *** the present work,to illustrate the influences of precipitate and grain-stored energy on localized corrosion evolution in 2A97 Al-Cu-Li alloy,cold working and artificial aging were carried out to produce 2A97 Al-Cu-Li alloys under different thermomechanical ***-in-situ analysis,traditional immersion test and electrochemical measurement were then conducted to examine the corrosion behavior of 2A97 *** is revealed that precipitate significantly affects Cu enrichment at corrosion fronts,which determines corrosion susceptibility of alloys,whereas grain-stored energy distribution is closely associated with localized corrosion *** is also indicated that quasi-in-situ analysis exhibits a consistent corrosion evolution with traditional immersion tests,which is regarded as a proper method to explore localized corrosion mechanisms by providing local microstructural information with enhanced time and spatial resolutions.

关键词： Al−Cu−Li alloy corrosion behavior quasi-in situ analysis grain-stored energy thermomechanical treatment

Research Progress on Detection Techniques of Fungicide Residues in Chinese Chives

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Agricultural Biotechnology 2024年第1期13卷 43-48页

作者： Xiuying CHEN zhe meng Chen DING Huihui LIU Yancheng ZHOU Jinlu LI Yanhua YAN Lei WANG Tangshan Food and Drug Comprehensive Testing Center Tangshan 063000China Key Laboratory of Agricultural Product Quality Evaluation and Nutrition and Health Ministry of Agriculture and Rural AffairsTangshan 063000China Hebei Agricultural Products Quality and Safety Testing Technology Innovation Center Tangshan 063000China Tangshan Institute of Industrial Technology for Functional Agricultural Products Tangshan 063000China Hebei North University College of Agriculture and Forestry Technology Zhangjiakou 075032China

Chinese chive is a kind of medicinal and edible plant,with many diseases,and chemical fungicides are usually used for *** order to find out the risk of pesticide residues in Chinese chives,this paper summarized relevant literatures published in recent years,and sorted out and analyzed the types of pesticides used and detection techniques of common diseases in Chinese chives.

关键词： Chinese chive Pesticide residues Fungicide Detection technique

Measurement of atmospheric non-reciprocity effects for satellite-based two-way time-frequency transfer

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Photonics Research 2024年第6期12卷 1274-1282页

作者： TING ZENG QI SHEN YUAN CAO JIAN-YU GUAN meng-zhe LIAN JIN-JIAN HAN LEI HOU JIAN LU XIN-XIN PENG MIN LI WEI-YUE LIU JIN-CAI WU YONG WANG JUAN YIN JI-GANG REN HAI-FENG JIANG QIANG ZHANG CHENG-ZHI PENG JIAN-WEI PAN Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaShanghai 201315China Hefei National Laboratory University of Science and Technology of ChinaHefei 230094China Faculty of Information Science and Engineering Ningbo UniversityNingbo 315211China Key Laboratory of Space Active Opto-Electronic Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

Future optical clock networks will require high-precision optical time-frequency transfer between satellites and ground ***,due to atmospheric turbulence,satellite motion and time delay between the satellite–ground transmission links will cause spatial and temporal variations,respectively,resulting in the breakdown of the time-of-flight reciprocity on which optical two-way time-frequency transfer is ***,we experimentally simulate the atmospheric effects by two-way spatio-temporally separated links between two stationary terminals located 113 km apart and measure the effects for optical two-way time-frequency *** experiment shows that the effect on the link instability is less than 2.3×10^(−19) at 10,000 *** indicates that when the link instability of satellite-ground optical time-frequency transfer is on the order of 10^(−19),it is not necessary to consider the atmospheric non-reciprocity effects.

关键词： breakdown transfer satellite

Surgical treatment of left-sided renal carcinoma with grade II inferior vena cava tumour thrombus: a report and review of the literature

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Biomedical Engineering Communications 2024年第1期3卷 31-37页

作者： Yan-Chen Wang Xiao-Yan Guo Yao-Fei Sun Li-Hui Guan Yuan Gao zhe meng Cheng-Liang Yin Tong-Bin Gao Department of Urology Weifang People's HospitalWeifang 261000China Faculty of Medicine Macao University of Science and TechnologyMacao 999078China

The surgical removal of renal cancer,along with the thrombectomy of the inferior vena cava tumour thrombus,represents a remarkable milestone in urological *** procedure is not only technically demanding but also requires a high level of surgical *** renal cancer combined with a vena cava tumour thrombus poses significant challenges,especially when dealing with combined grade Ⅱ-Ⅳ inferior vena cava tumour *** complexity of these cases is further exacerbated by the delicate anatomical structures involved and the need to preserve critical vessels while effectively removing the *** Upper Urethral Tumour Treatment Centre of Weifang People's Hospital successfully treated a challenging case of left renal tumour combined with grade II inferior vena cava tumour *** surgical team,led by experienced urological surgeons,meticulously planned and executed the procedure,ensuring minimal trauma to the patient and complete removal of the *** achievement not only demonstrates the hospital's commitment to providing state-of-the-art surgical care but also highlights the importance of continued research and training in urological *** successful outcome of this case is a testament to the expertise and dedication of the medical team and offers hope to patients facing similar complex surgical challenges.

关键词： renal carcinoma vena cava tumour thrombus renal artery embolism transoesophageal echocardiography three-dimensional reconstruction techniques

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基于树木年代学的迫龙沟泥石流灾害历史重建

地球科学 2024年第1期49卷 335-346页

作者：吕立群王兆印孟哲北京林业大学水土保持学院北京100083 清华大学水沙科学与水利水电工程国家重点实验室北京100084

迫龙沟是帕隆藏布下游右岸一级支流,1983、1984、1985和2015年爆发过4次泥石流,重复堵江并形成长约1 km的堰塞湖.个别主沟泥石流事件和沟道内部滑坡、支沟泥石流没有冲出沟口,无文献记录,但是造成沟道中上游河床演变和树木扰动.基于树... 详细信息

迫龙沟是帕隆藏布下游右岸一级支流,1983、1984、1985和2015年爆发过4次泥石流,重复堵江并形成长约1 km的堰塞湖.个别主沟泥石流事件和沟道内部滑坡、支沟泥石流没有冲出沟口,无文献记录,但是造成沟道中上游河床演变和树木扰动.基于树木年代学,通过分析树木年轮损伤组织、生长抑制和释放动态,重建了迫龙沟40年来的主沟泥石流和沟道内部滑坡、支沟泥石流灾害历史;从树木生长扰动强度等方面探讨了泥石流的流动范围;并通过Wit指数进一步分析了没有历史记录的主沟泥石流、沟道内部滑坡、支沟泥石流发生时间和流动范围.树木年代学所反映的泥石流爆发时间的准确性与泥石流规模有关,泥石流规模太大会导致受扰动树木的灾害历史记忆消灭,不利于大规模灾害发生之前的泥石流事件的定年.沟道内的众多支沟泥石流和主沟内的滑坡会对主沟泥石流事件的定年产生干扰,但是与主沟泥石流同一时间发生的支沟泥石流和主沟滑坡事件会增大Wit指数,利于主沟泥石流灾害事件的定年.

关键词：泥石流树木年代学损伤组织生长抑制灾害重建工程地质

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“中国特有的教育家精神”的文化逻辑

教师教育论坛 2024年第3期37卷 4-10页

作者：杨孟哲华中师范大学国家教育治理研究院武汉430079

“中国特有的教育家精神”是一种独具中国特征和文化内质的理论抽象,它不同于西式的教育伦理,有其特殊的文化逻辑。“中国特有的教育家精神”根植于中华优秀传统文化,源自于中国优秀教育家自身的文化品质,它与革命文化、中国特色社会主... 详细信息

“中国特有的教育家精神”是一种独具中国特征和文化内质的理论抽象,它不同于西式的教育伦理,有其特殊的文化逻辑。“中国特有的教育家精神”根植于中华优秀传统文化,源自于中国优秀教育家自身的文化品质,它与革命文化、中国特色社会主义先进文化的时代发展同向同行。在新时代,“中国特有的教育家精神”赋予了“教育家精神”新的意涵,我们必须坚持和发展这种具有中国特色的精神文化,进一步拓展其广度和深度,提升中国文化在世界范围内的创造力和影响力,为实现中华民族的伟大复兴提供中国智慧和文化支撑。

关键词：教育家精神人民教师教育强国