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Bearing mechanism of roof and rib support structure in automatically formed roadway and its support design method

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Journal of Central South University 2024年第7期31卷 2467-2487页

作者： JIANG Bei WANG Ming-zi WANG Qi XIN Zhong-xin XING Xue-yang DENG Yu-song YAO Liang-di State Key Laboratory for Tunnel engineering China University of Mining and Technology-BeijingBeijing 100083China research center of Geotechnical and Structural engineering Shandong UniversityJi􀆳nan 250061China College of Civil engineering and Architecture Shandong University of AeronauticsBinzhou 256600China

Non-pillar mining technology with automatically formed roadway is a new mining method without coal pillar reservation and roadway *** stability control of automatically formed roadway is the key to the successful application of the new *** order to realize the stability control of the roadway surrounding rock,the mechanical model of the roof and rib support structure is established,and the influence mechanism of the automatically formed roadway parameters on the compound force is *** this basis,the roof and rib support structure technology of confined lightweight concrete is proposed,and its mechanical tests under different eccentricity are carried *** results show that the bearing capacity of confined lightweight concrete specimens is basically the same as that of ordinary confined concrete *** bearing capacity of confined lightweight concrete specimens under different eccentricities is 1.95 times higher than those of U-shaped steel *** comparing the test results with the theoretical calculated results of the confined concrete,the calculation method of the bearing capacity for the confined lightweight concrete structure is *** design method of confined lightweight concrete support structure is established,and is successfully applied in the extra-large mine,Ningtiaota Coal Mine,China.

关键词： automatically roadway with non-pillar confined lightweight concrete roof and rib support mechanical model bearing behaviour

Exploring the mechanisms of calcium carbonate deposition on various substrates with implications for effective anti-scaling material selection

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Petroleum Science 2024年第4期21卷 2870-2880页

作者： Lu Gong Fei-Yi Wu Ming-Fei Pan Jun Huang Hao Zhang Jing-Li Luo Hong-Bo Zeng College of Science China University of Petroleum Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum Basic research center for Energy Interdisciplinary College of Science China University of Petroleum Department of Chemical and Materials engineering University of Alberta Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) School of Mechanical Engineering Shandong University

The unexpected scaling phenomena have resulted in significant damages to the oil and gas industries,leading to issues such as heat exchanger failures and pipeline clogging. It is of practical and fundamental importance to understand the scaling mechanisms and develop efficient anti-scaling strategies. However,the underlying surface interaction mechanisms of scalants(e.g., calcite) with various substrates are still not fully understood. In this work, the colloidal probe atomic force microscopy(AFM) technique has been applied to directly quantify the surface forces between calcite particles and different metallic substrates,including carbon steel(CR1018), low alloy steel(4140), stainless steel(SS304) and tungsten carbide,under different water chemistries(i.e., salinity and p H). Measured force profiles revealed that the attractive van der Waals(VDW) interaction contributed to the attachment of the calcium carbonate particles on substrate surfaces, while the repulsive electric double layer(EDL) interactions could inhibit the attachment behaviors. High salinity and acidic p H conditions of aqueous solutions could weaken the EDL repulsion and promote the attachment behavior. The adhesion of calcite particles with CR1018 and4140 substrates was much stronger than that with SS304 and tungsten carbide substrates. The bulk scaling tests in aqueous solutions from an industrial oil production process showed that much more severe scaling behaviors of calcite was detected on CR1018 and 4140 than those on SS304 and tungsten carbide, which agreed with surface force measurement results. Besides, high salinity and acidic p H can significantly enhance the scaling phenomena. This work provides fundamental insights into the scaling mechanisms of calcite at the nanoscale with practical implications for the selection of suitable antiscaling materials in petroleum industries.

关键词： Scaling phenomenon Metallic substrates Surface forces Bulk scaling tests

Efficient conversion of aromatic and phenylpropanoid alcohols to acids by the cascade biocatalysis of alcohol and aldehyde dehydrogenases

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Synthetic and Systems Biotechnology 2024年第2期9卷 187-195页

作者： Zetian Qiu Xiaohui Liu Jie Yu Yushuo Zhao Guang-Rong Zhao Shengying Li Kun Liu Lei Du Li Ma State Key Laboratory of Microbial Technology Shandong UniversityQingdaoShandong266237China Frontier Science center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin UniversityYaguan Road 135Jinnan DistrictTianjin300350China School of Health Management Hengxing UniversityQingdaoShandong266100China

Benzyl and phenylpropanoid acids are widely used in organic synthesis of fine chemicals,such as pharmaceuticals and ***,biocatalysis of these acids has received less attention than chemical *** of the main challenges for biological production is the limited availability of alcohol dehydrogenases and aldehyde *** microorganisms are potential sources of these *** this study,129 alcohol dehydrogenases and 42 aldehyde dehydrogenases from Corynebacterium glutamicum,Pseudomonas aeruginosa,and Bacillus subtilis were identified and explored with various benzyl and phenylpropanoid alcohol and aldehyde substrates,among which four alcohol dehydrogenases and four aldehyde dehydrogenases with broad substrate specificity and high catalytic activity were ***,a cascade whole-cell catalytic system including ADH-90,ALDH-40,and the NAD(P)H oxidase LreNox was established,which showed high efficiency in converting cinnamyl alcohol and p-methylbenzyl alcohol into the respective carboxylic ***,this biocatalytic system can be easily scaled up to gram-level production,facilitating preparation purposes.

关键词： Benzyl acids Phenylpropanoid acids Alcohol dehydrogenases Aldehyde dehydrogenases Whole-cell catalysis

Atomically Dispersed Zinc Active Sites Efficiently Promote the Electrochemical Conversion of N_(2) to NH_(3)

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Energy & Environmental Materials 2024年第3期7卷 175-181页

作者： Yanjiao Wei Xinyu Wang Mengjie Sun Min Ma Jian Tian Minhua Shao School of Materials Science and engineering Shandong University of Science and TechnologyQingdao 266590China Department of Chemical and Biological engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China Energy Institute and Chinese National Engineering Research Center for Control&Treatment of Heavy Metal PollutionThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong China

At present,the research on highly active and stable nitrogen reduction reaction catalysts is still challenging work for the electrosynthesis of ammonia(NH_(3)).Herein,we synthesized atomically dispersed zinc active sites supported on N-doped carbon nanosheets(Zn/NC NSs)as an efficient nitrogen reduction reaction catalyst,which achieves a high ammonia yield of 46.62μg h^(-1)mg^(-1)_(cat).at-0.85 V(vs RHE)and Faradaic efficiency of 95.8%at-0.70 V(vs RHE).In addition,Zn/NC NSs present great stability and selectivity,and there is no significant change in NH_(3)rate and Faradaic efficiencies after multiple *** structural characterization shows that the active center in the nitrogen reduction reaction process is the Zn-N_(4)sites in the *** calculation confirms that Zn/NC with Zn-N_(4)configuration has a lower energy barrier for the formation of^(*)NNH intermediate compared with pure N-doped carbon nanosheets(N-C NSs),thus promoting the hydrogenation kinetics in the whole nitrogen reduction reaction process.

关键词： electrocatalysis nitrogen reduction single-atom catalyst Zn-N_(4)

A new ChatGPT-empowered,easy-to-use machine learning paradigm for environmental science

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Eco-Environment & Health 2024年第2期3卷 131-136页

作者： Haoyuan An Xiangyu Li Yuming Huang Weichao Wang Yuehan Wu Lin Liu Weibo Ling Wei Li Hanzhu Zhao Dawei Lu Qian Liu Guibin Jiang State Key Laboratory of Environmental Chemistry and Toxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Biomedical engineering Institute School of Control Science and EngineeringShandong UniversityJinan 250061China

The quantity and complexity of environmental data show exponential growth in recent ***-quality big data analysis is critical for performing a sophisticated characterization of the complex network of environmental *** learning(ML)has been employed as a powerful tool for decoupling the complexities of environmental big data based on its remarkable fitting ***,due to the knowledge gap across different subjects,ML concepts and algorithms have not been well-popularized among researchers in environmental *** this context,we introduce a new research paradigm—“ChatGPT t ML t Environment”,providing an unprecedented chance for environmental researchers to reduce the difficulty of using ML *** instance,each step involved in applying ML models to environmental sustainability,including data preparation,model selection and construction,model training and evaluation,and hyper-parameter optimization,can be easily performed with guidance from *** also discuss the challenges and limitations of using this research paradigm in the field of environmental ***,we highlight the importance of“secondary training”for future application of“ChatGPT t ML t Environment”.

关键词： Machine learning Environmental application ChatGPT Secondary training

Near-field radiative heat transfer between nanoporous GaN films

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Chinese Physics B 2024年第4期33卷 109-120页

作者：韩晓政张纪红刘皓佗吴小虎冷惠文 School of Electromechanical and Automotive engineering Yantai UniversityYantai 264005China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China Thermal Science research center Shandong Institute of Advanced TechnologyJinan 250100China

Photon tunneling effects give rise to surface waves,amplifying radiative heat transfer in the near-field *** research has highlighted that the introduction of nanopores into materials creates additional pathways for heat transfer,leading to a substantial enhancement of near-field radiative heat transfer(NFRHT).Being a direct bandgap semiconductor,GaN has high thermal conductivity and stable resistance at high temperatures,and holds significant potential for applications in optoelectronic ***,study of NFRHT between nanoporous GaN films is currently lacking,hence the physical mechanism for adding nanopores to GaN films remains to be discussed in the field of *** this work,we delve into the NFRHT of GaN nanoporous films in terms of gap distance,GaN film thickness and the vacuum filling *** results demonstrate a 27.2%increase in heat flux for a 10 nm gap when the nanoporous filling ratio is ***,the spectral heat flux exhibits redshift with increase in the vacuum filling *** be more precise,the peak of spectral heat flux moves fromω=1.31×10^(14)rad·s^(-1)toω=1.23×10^(14)rad·s^(-1)when the vacuum filling ratio changes from f=0.1 to f=0.5;this can be attributed to the excitation of surface phonon *** introduction of graphene into these configurations can highly enhance the NFRHT,and the spectral heat flux exhibits a blueshift with increase in the vacuum filling ratio,which can be explained by the excitation of surface plasmon *** findings offer theoretical insights that can guide the extensive utilization of porous structures in thermal control,management and thermal modulation.

关键词： near-field radiative heat transfer nanoporous GaN film surface phonon polaritons surface plasmon polaritons

An Ion-Pumping Interphase on Graphdiyne/Graphite Heterojunction for Fast-Charging Lithium-Ion Batteries

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CCS Chemistry 2024年第1期6卷 110-124页

作者： Juan An Fan Wang Jia-Yue Yang Guoxing Li Yuliang Li shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Science Center for Material Creation and Energy ConversionSchool of Chemistry and Chemical EngineeringInstitute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237 Optics&Thermal Radiation research center Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237 Institute of Chemistry The Chinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049

The sluggish lithium-ion(Li-ion)transport kinetics in graphite anode hinders its application in fast-charging Li-ion batteries(LIBs).Here,we develop an ionpumping interphase(IPI)on graphdiyne(GDY)/graphite heterojunction anodes to boost the ionic transport kinetics and enable high-performance,fast-charging *** IPI changed the ion solvation/desolvation environment by covalent/non-covalent interactions with Li ions or solvents to optimize solid-electrolyte interphase(SEI)and regulate Li-ion transport *** studied the in situ growth of few-layer GDY on graphite surface(GDY/graphite)as the IPI and found that the strong interaction between GDY and Li ions enabled surface-induced modification of the ion solvation behavior and surface-assisted desolvation effect to accelerate the Li-ion desolvation process.A functional anion-derived SEI layer with improved Li-ion conductivity was *** with the generated built-in electric field at GDY/graphite hetero-interface self-pumping Li ions to intercalate into the graphite,the Li-ion transport kinetics was significantly enhanced to effectively eliminate Li plating and large voltage polarization of the graphite anodes.A fast Li intercalation in GDY/graphite without Li oversaturation at the edge of the graphite was directly *** superior performance with high capacity(139.2 mA h g^(-1))and long lifespan(1650 cycles)under extremely fast-charging conditions(20 C,1 C=372 mA g^(-1))was achieved on GDY/graphite *** at low temperatures(-20℃),a specific capacity of 128.4 mA h g^(-1) was achieved with a capacity retention of 80%after 500 cycles at a 2 C rate.

关键词： extreme fast-charging lithium-ion batteries lithium-ion transport kinetics ion-pumping interphase graphdiyne/graphite heterojunction

An environmentally sensitive zinc-selective two-photon NIR fluorescent turn-on probe and zinc sensing in stroke

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Journal of Pharmaceutical Analysis 2024年第4期14卷 578-584页

作者： Junfeng Wang Qibing Liu Yingbo Li Yi Pang Department of Chemistry The University of AkronAkronOH 44325USA Gordon center for Medical Imaging Department of RadiologyMassachusetts General HospitalHarvard Medical SchoolBostonMA 02114USA Department of Pharmacy The First Affiliated Hospital of Hainan Medical UniversityHaikou570100China engineering research center of Tropical Medicine Ministry of EducationHainan Medical UniversityHaikou571199China State Key Laboratory of natural and Biomimetic drugs School of Pharmaceutical SciencesPeking UniversityBeijing100191China Maurice Morton Institute of Polymer Science The University of AkronAkronOH 44325USA

A two-photon near infrared(NIR)fluorescence turn-on sensor with high selectivity and sensitivity for Zn^(2+)detection has been *** sensor exhibits a large Stokes'shift(-300 nm)and can be excited from 900 to 1000 nm,with an emission wavelength of-785 nm,making it ideal for imaging in biological *** sensor's high selectivity for Zn^(2+)over other structurally similar cations,such as Cd^(2+),makes it a promising tool for monitoring zinc ion levels in biological *** the high concentration of zinc in thrombi,this sensor could provide a useful tool for in vivo thrombus imaging.

关键词： Near-infrared Molecular imaging Thrombus Stroke

A non-peptide-based chymotrypsin-targeted long-wavelength emission fluorescent probe with large Stokes shift and its application in bioimaging

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Chinese Chemical Letters 2024年第10期35卷 430-436页

作者： Chuanfeng Fan Jian Gao Yingkai Gao Xintong Yang Gaoning Li Xiaochun Wang Fei Li Jin Zhou Haifeng Yu Yi Huang Jin Chen Yingying Shan Li Chen Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOEShandong Provincial Key Laboratory of Biochemical EngineeringQingdao Nucleic Acid Rapid Detection Engineering Research CenterCollege of Marine Science and Biological EngineeringQingdao University of Science and TechnologyQingdao266042China School of Chemistry and Life Science Anshan Normal UniversityLiaoning Key Laboratory of Development and Utilization for Natural Products Active MoleculesAnshan114007China Biomedical Analysis center Army Medical UniversityChongqing 400038China School of Pharmacy Weifang Medical UniversityWeifang 261053China College of Chemistry Baicheng Normal UniversityBaicheng 137000China

As a hydrolase,chymotrypsin(CHT)is involved in many physiological activities,and its abnormal activity is closely related to diabetes,pancreatic fibrosis,chronic pancreatitis and pancreatic *** this work,an innovative long-wavelength emission fluorescent probe TCF-CHT was designed and synthesized for the high specificity detection of CHT,which utilized TCF-OH and a mimetic peptide substrate 4-bromobutyryl as chromogenic group and recognition group,***-CHT exhibited excellent selectivity and eye-catching sensitivity(8.91 ng/m L)towards CHT,“off-on”long-wavelength emission at 670 nm and large Stokes shift(140 nm).Furthermore,the successful fulfillment and perfect performance in imaging endogenous CHT in complex organisms(P815 cells,HepG2 cells,zebrafish and tumor-bearing mice)verified its potential as a powerful tool for the recognition of CHT in complicated biological environments.

关键词： Chymotrypsin Fluorescent probe Long-wavelength emission Large Stokes shift Bioimaging