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DEMETER卫星监测到的海地地震前电离层扰动

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地震 2011年第2期31卷 68-78页

作者：焦其松颜蕊张景发中国地震局地壳应力研究所北京100085 山东科技大学地质学院山东青岛266510

本文利用法国DEMETER卫星观测到的电离层数据,对2010年1月12日加勒比海地区海地太子港附近发生的MS7.1地震震前电离层扰动进行了探索性研究。通过对电磁场频谱、等离子体数密度、温度等物理参量的分析,探讨了电离层变化与地震的关系。... 详细信息

本文利用法国DEMETER卫星观测到的电离层数据,对2010年1月12日加勒比海地区海地太子港附近发生的MS7.1地震震前电离层扰动进行了探索性研究。通过对电磁场频谱、等离子体数密度、温度等物理参量的分析,探讨了电离层变化与地震的关系。研究结果表明,海地地震前出现的异常电磁现象的空间效应是清楚的,震前几小时磁赤道峰存在剧烈扰动,震中附近电场分量E12低频谱密度有增强现象。临震前1天和临震前3天在震中+5°范围电子数密度(Ne)出现异常,震前8天氧离子(O+)数密度在震中上空出现了异常现象。震前震中区上空电磁场VLF在40 Hz和120 Hz等低频点出现清晰的电场异常扰动,震前出现的这种变化可能与地震有关。

关键词： DEMETER卫星电离层扰动海地地震

Skin neuropathy and immunomodulation in diseases

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Fundamental Research 2024年第2期4卷 218-225页

作者： Manze zhang Tingting Liu jing Yang Department of Biology Stanford UniversityStanfordCA 94305USA Department of Biochemistry Weill Cornell Medical CollegeNew YorkNY 10065USA IDG/McGovern Institute for Brain Research Center for Life SciencesSchool of Life SciencesPeking UniversityBeijing 100871China Peking University Third Hospital Cancer Center Beijing 100191China

Skin is a vital barrier tissue of the *** responses in the skin must be precisely controlled,which would otherwise cause severe disease conditions such as psoriasis,atopic dermatitis,or pathogenic *** evidence has increasingly demonstrated the essential roles of neural innervations,i.e.,sensory and sympathetic signals,in modulating skin ***,neuropathic changes of such neural structures have been observed in skin disease conditions,implicating their direct involvement in various pathological *** in-depth understanding of the mechanism underlying skin neuropathy and its immunomodulatory effects could help reveal novel entry points for therapeutic ***,we summarize the neuroimmune interactions between neuropathic events and skin immunity,highlighting the current knowledge and future perspectives of this emerging research frontier.

关键词： Skin Neuropathy Neuroimmune Psoriasis Atopic dermatitis Pathogenic infection

Kinetics insights into size effects of carbon nanotubes' growth and their supported platinum catalysts for 4,6-dinitroresorcinol hydrogenation

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第8期72卷 133-140页

作者： zhang, Yan zhang, Xiangxue Sang, Keng Chen, Wenyao Qian, Gang zhang, jing Duan, Xuezhi Zhou, Xinggui Yuan, Weikang East China Univ Sci & Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China

Size effects are a well-documented phenomenon in heterogeneous catalysis, typically attributed to alterations in geometric and electronic properties. In this study, we investigate the influence of catalyst size in the preparation of carbon nanotube (CNT) and the hydrogenation of 4,6-dinitroresorcinol (DNR) using Fe2O3 and Pt catalysts, respectively. Various Fe2O3/Al2O3 catalysts were synthesized for CNT growth through catalytic chemical vapor deposition. Our findings reveal a significant influence of Fe2O3 nanoparticle size on the structure and yield of CNT. Specifically, CNT produced with Fe2O3/Al2O3 containing 28% (mass) Fe loading exhibits abundant surface defects, an increased area for metal-particle immobilization, and a high carbon yield. This makes it a promising candidate for DNR hydrogenation. Utilizing this catalyst support, we further investigate the size effects of Pt nanoparticles on DNR hydrogenation. Larger Pt catalysts demonstrate a preference for 4,6-diaminoresorcinol generation at (1 0 0) sites, whereas smaller Pt catalysts are more susceptible to electronic properties. The kinetics insights obtained from this study have the potential to pave the way for the development of more efficient catalysts for both CNT synthesis and DNR hydrogenation. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Kinetics Size effects Catalytic hydrogenation Active site PHASE HYDROGENATION CINNAMALDEHYDE NITROBENZENE PRECURSOR FIBERS

FP-Zernike:An Open-source Structural Database Construction Toolkit for fast Structure Retrieval

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Genomics, Proteomics & Bioinformatics 2024年第1期22卷 111-119页

作者： Junhai Qi Chenjie Feng Yulin Shi Jianyi Yang fa zhang Guojun Li Renmin Han Research Center for Mathematics and Interdisciplinary Sciences Shandong UniversityQingdao 266237China BioMap Research Menlo ParkCA 94025USA College of Medical Information and Engineering Ningxia Medical UniversityYinchuan 750004China Institute of Engineering Medicine Beijing Institute of TechnologyBeijing 100081China

The release of AlphaFold2 has sparked a rapid expansion in protein model *** protein structure retrieval is crucial for the analysis of structure models,while measuring the similarity between structures is the key challenge in structural *** existing structure alignment algorithms can address this challenge,they are often ***,the state-of-the-art approach involves converting protein structures into three-dimensional(3D)Zernike descriptors and assessing similarity using Euclidean ***,the methods for computing 3D Zernike descriptors mainly rely on structural surfaces and are predominantly web-based,thus limiting their application in studying custom *** overcome this limitation,we developed FP-Zernike,a user-friendly toolkit for computing different types of Zernike descriptors based on feature *** simply need to enter a single line of command to calculate the Zernike descriptors of all structures in customized ***-Zernike outperforms the leading method in terms of retrieval accuracy and binary classification accuracy across diverse benchmark *** addition,we showed the application of FP-Zernike in the construction of the descriptor database and the protocol used for the Protein Data Bank(PDB)dataset to facilitate the local deployment of this tool for interested *** demonstration contained 590,685 structures,and at this scale,our system required only 4-9 s to complete a *** experiments confirmed that it achieved the state-of-the-art accuracy ***-Zernike is an open-source toolkit,with the source code and related data accessible at https://***/biocode/tools/BT007365/releases/0.1,as well as through a webserver at http://***/.

关键词： Zernike descriptor Structure alignment PDB dataset Open-source Retrieval system

Selective photosynthesis of Z-olefins through crystalline metal-organic cage-initiated expeditious cascade reactions

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Carbon Energy 2024年第3期6卷 118-131页

作者： Jia-Ni Lu Yunze Huang Yuan-Sheng Xia Long-zhang Dong Lei zhang jing-jing Liu Lan-Gui Xie Jiang Liu Ya-Qian Lan Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceJiangsu Collaborative Innovation Centre of Biomedical Functional MaterialsNanjing Normal UniversityNanjingChina School of Chemistry South China Normal UniversityGuangzhouChina

The semi-hydrogenation of alkyne to form Z-olefins with high conversion and high selectivity is still a huge challenge in the chemical ***,flammable and explosive hydrogen as the common hydrogen source of this reaction increases the cost and danger of industrial ***,we connect the photocatalytic hydrogen evolution reaction and the semihydrogenation reaction of alkynes in series and successfully realize the high selective production of Z-alkenes using low-cost,safe,and green water as the proton *** the cascade reaction,a series of isomorphic metal–organic cage catalysts(Co_(x)Zn_(8−x)L_(6),x=0,3,4,5,and 8)are designed and synthesized to improve the yield of the photocatalytic hydrogen *** them,Co_(5)Zn_(3)L_(6) shows the highest photocatalytic activity,with a H_(2) generation rate of 8.81 mmol g^(−1) h^(−1).Then,Co_(5)Zn_(3)L_(6) is further applied in the above tandem reaction to efficiently reduce alkynes to Z-alkenes under ambient conditions,which can reach high conversion of>98%and high selectivity of>99%,and maintain original catalytic activity after multiple ***“one-pot”tandem reaction can achieve a highly selective and safe stepwise conversion from water into hydrogen into Z-olefins under mild reaction conditions.

关键词： alkyne semi-hydrogenation hydrogen evolution reaction metal-organic cages photocatalysis Z-olefins

Real-time,single-particle chemical composition,volatility and mixing state measurements of urban aerosol particles in southwest China

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Journal of Environmental Sciences 2024年第2期136卷 361-371页

作者： Luyao Chen Junke zhang Jiaqi Li Xiaojuan Huang Yuzheng Xiang jing Chen Tingru Pan Wei zhang faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China School of Atmospheric Sciences Chengdu University of Information TechnologyChengdu 610225China Sichuan Environmental Monitoring Center Chengdu 610074China

To investigate the volatility of atmospheric particulates and the evolution of other particulate properties(chemical composition,particle size distribution and mixing state)with temperature,a thermodenuder coupled with a single particle aerosol mass spectrometer was used to conduct continuous observations of atmospheric fine particles in Chengdu,southwest *** of their complex sources and secondary reaction processes,the average mass spectra of single particles contained a variety of chemical components(including organic,inorganic and metal species).When the temperature rose from room temperature to280℃,the relative areas of volatile and semi-volatile components decreased,while the relative areas of less or non-volatile components ***(>80%)nitrate and sulfate existed in the form of NH_(4)NO_(3)and(NH_(4))_(2)SO_(4),and their volatilization temperatures were50–100℃and 150–280℃,*** contribution of biomass burning(BB)and vehicle emission(VE)particles increased significantly at 280℃,which emphasized the important role of regional biomass burning and local motor vehicle emissions to the core of *** the increase in temperature,the particle size of the particles coated with volatile or semi-volatile components was reduced,and their mixing with secondary inorganic components was significantly *** formation of K-nitrate(KNO_(3))and K-sulfate(KSO_(4))particles was dominated by liquid-phase processes and photochemical reactions,*** KNO_(3)and BB particles is the key to improving *** new results are helpful towards better understanding the initial sources,pollution formation mechanisms and climatic effects of fine particulate matter in this megacity in southwest China.

关键词： Atmospheric fine particles TD-SPAMS Chemical composition Volatility Mixing state

Manipulation of magnetocaloric and elastocaloric effects in Ni-Mn-In alloys by lattice volume and magnetic variation:Effect of Co and Fe co-doping

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Journal of Materials Science & Technology 2024年第5期172卷 156-165页

作者： Xinzeng Liang Chi zhang jing Bai Jianglong Gu Yudong zhang Claude Esling Xiang Zhao Liang Zuo School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Key Laboratory for Anisotropy and Texture of Materials Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux LEM3 CNRSUMR 7239University of Lorraine57045 MetzFrance

The effects of Co and Fe co-doping Ni-Mn-In alloy on the phase stability,lattice parameters,mag-netic properties,and electronic structures are systematically investigated by using the first-principles *** indicate that Fe atoms replace the excess Mn2 atoms by direct and indirect coex-istence(Fe→Mn 2 and Fe→In→Mn2);Co substitutes the Ni atoms by direct substitution(Co→Ni)for the Ni-Mn-In *** austenites all exhibit the ferromagnetic(FM)state for the studied *** NM martensites are in the ferrimagnetic(FIM-1)state for the Ni_(2)Mn_(1.5)In_(0.5),Ni_(2)Mn_(1.25)In_(0.5)Fe 0.25,Ni_(1.75)Mn_(1.5)In_(0.5)Co_(0.25),and Ni_(1.75)Mn_(1.25)In_(0.5)Co_(0.25)Fe 0.25 alloys,while the other compositions are in the FM *** phase stability of austenite and martensite decreases with increasing Co and Fe co-doping.A magnetic-structural coupling transition occurs at xfavored by larger magnetization difference(△M)and lattice volume change(△V/V_(0)).Based on the calculated phase stability,magneto-structure coupling,△V/V 0 and c/a ratio,one can predict that the Ni_(2)-x Mn_(1.5)-y In_(0.5)Co x Fe y alloy with Co content 0≤x≤0.25 and Fe content 0≤y≤0.05 is predicted to have good magneto-controlled functional behavior.

关键词： Ni-Mn-In-Co-Fe Phase stability Magnetocaloric effect Elastocaloric effect

Coherence analysis of noise-like pulses generated by an erbium-doped fiber mode-locked laser

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Optoelectronics Letters 2024年第4期20卷 205-210页

作者： zhang Ziyi WANG Chuncan LI jing WANG Peng Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of EducationInstitute of Lightwave TechnologyBeijing Jiaotong University Beijing 100044China

The noise-like pulses(NLPs)with tunable fraction of the pedestal height in the whole intensity autocorrelation(AC)trace are numerically demonstrated in the designed erbium-doped fiber(EDF)mode-locked laser,which contains the saturable absorber(SA)with nonlinear polarization rotation(NPR),sinusoidal-shaped or Gaussian-shaped filter,two segments of EDFs,and two pieces of single-mode fibers(SMFs)with normal dispersion and anomalous dispersion,*** pedestal ratio of the intensity AC trace can be tuned by changing the gain saturation energies of *** results show that when the net cavity dispersion is 1.06 ps^(2),the tuning range of the pedestal ratio for the NLPs can reach its maximum values,which are 0.51—0.89 and 0.58—0.88 for the sinusoidal-shaped and Gaussian-shaped filters,*** addition,an appropriate choice of filter bandwidth is also conducive to obtain a wide range of the tuning pedestal ratio for the intensity AC trace.

关键词： fiber tuning polarization

Effect of bubble morphology and behavior on power consumption in non-Newtonian fluids’aeration process

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Chinese Journal of Chemical Engineering 2024年第1期65卷 243-254页

作者： Xiemin Liu jing Wan Jinnan Sun Lin zhang Feng zhang Zhibing zhang Xinyao Li Zheng Zhou Key Laboratory of Mesoscopic Chemistry of Ministry of Education(MOE) School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Dalian Research Institute of Petroleum and Petrochemicals SINOPECDalian 116045China

Due to a prolonged operation time and low mass transfer efficiency, the primary challenge in the aeration process of non-Newtonian fluids is the high energy consumption, which is closely related to the form and rate of impeller, ventilation, rheological properties and bubble morphology in the reactor. In this perspective, through optimal computational fluid dynamics models and experiments, the relationship between power consumption, volumetric mass transfer rate(kLa) and initial bubble size(d0) was constructed to establish an efficient operation mode for the aeration process of non-Newtonian fluids. It was found that reducing the d0could significantly increase the oxygen mass transfer rate, resulting in an obvious decrease in the ventilation volume and impeller speed. When d0was regulated within 2-5 mm,an optimal kLa could be achieved, and 21% of power consumption could be saved, compared to the case of bubbles with a diameter of 10 mm.

关键词： Non-Newtonian fluids aeration process Power consumption Volumetric mass transfer rate Bubble size