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Mesospheric tide comparisons at low latitudes observed by two collocated meteor radars

Earth and Planetary Physics 2025年第1期9卷 54-68页

作者： Jian Li Wen Yi XiangHui Xue Jie Zeng HaiLun Ye JianYuan Wang JinSong chen Na Li TingDi chen Chinese Academy of Sciences(CAS)Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Anhui Mengcheng Geophysics National Observation and Research StationUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Astronautical Science and Technology Harbin 150001China National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave PropagationQingdao 266107China Yunnan Kunming Electromagnetic Environment National Observation and Research Station Qujing Kunming 655000China

Accurate knowledge of mesospheric winds and waves is essential for studying the dynamics and climate in the mesosphere and lower thermosphere(MLT)*** this study,we conduct a comparative analysis of the mesosphere tidal results obtained from two adjacent meteor radars at low latitudes in Kunming,China,from November 2013 to December *** two radars operate at different frequencies of 37.5 MHz and 53.1 MHz,***,overall good agreement is observed between the two radars in terms of horizontal winds and tide *** results show that the dominant tidal waves of the zonal and meridional winds are diurnal and semidiurnal ***,we conduct an exhaustive statistical analysis to compare the tidal amplitudes and vertical wavelengths recorded by the dual radar systems,which reveals a high degree of alignment in tidal *** investigation includes variances and covariances of tidal amplitudes,which demonstrate remarkable consistency across measurements from both *** finding highlights clear uniformity in the mesospheric tidal patterns observed at low latitudes by the two neighboring meteor *** of the comparative analysis specifically underscore the significant correlation in vertical wavelength measurements,validating the robustness of radar observations for tidal research.

关键词： mesosphere and lower thermosphere region meteor radar mesospheric winds tides

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High Pressure Raman Study of Phase Transitions on Solid Benzene Using Raman Notch Filter Set

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Chinese Physics Letters 1996年第4期13卷 293-296页

作者： XU Li-wen WANG ru-ju chen Liang-chen Institute of Physics Chinese Academy of SciencesBeijing 100080

A high-throughput Haman notch filter set has been manufactured and used to collect the Raman scattering signals of pressure-hiduced phase transitions of solid benzene in a diamond anvil cell up to 15 GPa at room *** changes in the profiles as well as the frequencies of Raman scattering spectra are observed and enable us to determine the phase transition.

关键词： temperature. transition. Transition

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1:13 phase formation mechanism and first-order magnetic transition strengthening characteristics in(La,Ce)Fe13–xSix alloys

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Rare Metals 2016年第9期35卷 691-700页

作者： Xiang chen Yun-gui chen Yong-Bo Tang Ding-Quan Xiao College of Engineering and Technology Neijiang Teachers Normal UniversityNeijiang 641002China School of Materials Science and Engineering Sichuan UniversityChengdu 610065China

The effects of the introduction of Ce to La（1-x）CexFe（11.5）Si（1.5） alloys on 1：13 phase formation mechanism,the first-order magnetic phase transition strengthening characteristics,and magnetocaloric property were studied,*** results show that the formation mechanisms of 1：13 and La Fe Si phases in La（1-x）CexFe（11.5）Si（1.5） alloys are the same as those of Ce2Fe（17） and CeFe2 phases in Ce–Fe binary system,*** substitution of Ce in 1：13 phase which is limited can make the first-order magnetic phase transition characteristics strengthen,which can make thermal and magnetic hysteresis increase,the temperature interval of temperatureinduced phase transition decrease,and the critical magnetic field of field-induced magnetic phase transition（HC）increase,*** to the lattice shrink of 1：13phase with the increase in Ce content,the Curie temperatures（TC） show a linear *** maximum change in magnetic entropy gradually increases due to the decrease in temperature interval of temperature-induced phase transition,but the relative cooling capacities are all about80 Jákg-1at magnetic field of 2 T.

关键词： La1-xCexFe1 5Si1 5alloys Short-time annealing Large magnetocaloric effect Magnetocaloric materials

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Fabrication of carbon-supported Al2O3 nanoparticles via spontaneous cross-linking to enhance selective hydrogenation of furfural

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Journal of Energy Chemistry 2025年第1期100卷 612-620页

作者： Weiwei Yu Xinbao Zhang Hongyu chen Yanan Wang Shaoguo Li Fucun chen Zhenni Liu Xiujie Li Xiangxue Zhu State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

Selective hydrogenation of furfural to furfuryl alcohol is a great challenge in the hydrogenation field due to thermodynamic preference for hydrogenation of C=C over C=***,a novel Al2O3/C-u hybrid catalyst,composed of N-modified dendritic carbon networks supporting Al2O3nanoparticles,was successfully prepared via carbonizing the freeze-dried gel from spontaneous cross-linking of alginate,Al3+and *** obtained carbon-supported Al2O3hybrid catalyst has a high ratio （31%） of Al species in pentahedral-coordinated *** introduction of urea enhances the surface N content,the ratio of pyrrolic N,and specific surface area of catalyst,leading to improved adsorption capacity of C=O and the accessibility of active *** the furfural hydrogenation reaction with isopropyl alcohol as hydrogen donor,Al2O3/C-u catalyst achieved a 90%conversion of furfural with 98.0% selectivity to furfuryl alcohol,outperforming that of commercial γ-***,Al2O3/C-u demonstrates excellent catalytic stability in the recycling tests attributed to the synergistic effect of abundant weak Lewis acid sites and the anchoring effect of the carbon network on *** work provides an innovative and facile strategy for fabrication of carbon-supported Al2O3hybrid catalysts with rich AlVspecies,serving as a high selective hydrogenation catalyst through MPV reaction route.

关键词： Selective hydrogenation Furfural Furfuryl alcohol Cross-linking MPV route

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Dative B–N bonds weaven toward two-dimensional purely organic materials for single crystals

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Science China Chemistry 2025年第01期 12-14页

作者： Wei-Lei Zhou Siwei Wang Yong chen College of Chemistry and Materials Science Inner Mongolia Key Laboratory of Chemistry for Nature Products and Synthesis for Functional Molecules Innovation Team of Optical Functional Molecular Devices Inner Mongolia Minzu University College of Chemistry Nankai University

Molecular topology is one of the important topics to study and understand the relationship between molecular structure and properties [1]. Particularly, two-dimensional (2D) materials with extremely high surface area and ultra-thin morphology have attracted considerable attention due to their unexpected properties in materials and chemistry [2,3].

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Asymptotic Properties of the Maximum Likelihood Estimate in Generalized Linear Models with Stochastic Regressors

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Acta Mathematica Sinica,English Series 2006年第6期22卷 1679-1686页

作者： Jie Li DING Xi ru chen School of Mathematics and Statistics Wuhan University Wuhan 430072 P. R. China Graduate School Chinese Academy of Sciences Beijing 100039 P. R. China

For generalized linear models （GLM）, in case the regressors are stochastic and have different distributions, the asymptotic properties of the maximum likelihood estimate （MLE） β^n of the parameters are studied. U... 详细信息

关键词： Generalized linear models Consistency Asymptotic normality

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交联型聚乙烯醇纸张表面施胶剂的制备及其应用

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陕西科技大学学报 2025年第1期43卷 1-7页

作者：费贵强李实肖文娟杨晨榕解攀陕西科技大学化学与化工学院陕西省轻化工助剂重点实验室陕西西安710021 西安北方惠安化学工业有限公司陕西西安710302

为了改善聚乙烯醇、淀粉作为纸张表面施胶剂的应用性能,选用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)和硼砂(STB)为交联剂,交联改性淀粉(PS)和聚乙烯醇(PVA1799),制备出不同交联程度的纸张表面施胶剂(CPSn-PVA).通过傅里叶红外光谱(FT-I... 详细信息

为了改善聚乙烯醇、淀粉作为纸张表面施胶剂的应用性能,选用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)和硼砂(STB)为交联剂,交联改性淀粉(PS)和聚乙烯醇(PVA1799),制备出不同交联程度的纸张表面施胶剂(CPSn-PVA).通过傅里叶红外光谱(FT-IR),扫描电镜(SEM)及稳定性测试对纸张表面施胶剂的性能进行了表征,探讨了KH560和STB的添加比例对纸张施胶剂的性能以及施胶后纸张物理性能的影响.实验结果表明,当STB添加量为0.1 g、KH560添加量为3 g时,纸张施胶剂膜拉伸强度可达25.6 MPa、断裂伸长率为326%.同时,与原纸相比,多重交联型纸张表面施胶剂表现出良好的应用性能,施胶后的纸张耐折次数、撕裂指数、接触角分别提升了6700%、65.04%、89.7%.

关键词：表面施胶剂改性淀粉聚乙烯醇硅烷偶联剂稳定性耐折度

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Synthesis of Novel Chiral Diol Ligands for the Enantioselective Reactions

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Chinese Chemical Letters 2001年第6期12卷 489-490页

作者： Ming Xia LI Yan Ming WANG ru ru chen Research Institute of Elemento-Organic Chemistry Nankai UniversityTianjin 300071 Pittsburgh University Medical Center PittsburghPA 15213U.S.A

A series of novel enantiomerically pure diols were synthesized from D-erythorbic acid in three steps, and the absolute configuration of one of them 4a has been confirmed by X-ray analysis.

关键词： Enantiomerically pure chiral diol ligands X-ray analysis

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A Cache Replacement Policy Based on Multi-Factors for Named Data Networking

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Computers, Materials & Continua 2020年第10期65卷 321-336页

作者： Meiju Yu ru Li Yuwen chen College of Computer Science Inner Mongolia UniversityHohhot020021China Department of Computer Systems Technology New York City College of Technology-The City University of New YorkBrooklynNY 11201USA

Named Data Networking(NDN)is one of the most excellent future Internet architectures and every router in NDN has the capacity of caching contents passing *** greatly reduces network traffic and improves the speed of content distribution and *** order to make full use of the limited caching space in routers,it is an urgent challenge to make an efficient cache replacement ***,the existing cache replacement policies only consider very few factors that affect the cache *** this paper,we present a cache replacement policy based on multi-factors for NDN(CRPM),in which the content with the least cache value is evicted from the caching *** fully analyzes multi-factors that affect the caching performance,puts forward the corresponding calculation methods,and utilize the multi-factors to measure the cache value of ***,a new cache value function is constructed,which makes the content with high value be stored in the router as long as possible,so as to ensure the efficient use of cache *** simulation results show that CPRM can effectively improve cache hit ratio,enhance cache resource utilization,reduce energy consumption and decrease hit distance of content acquisition.

关键词： Cache replacement policy named data networking content popularity freshness energy consumption

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禽白血病病毒p27蛋白单克隆抗体制备及抗原表位的鉴定

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动物医学进展 2025年第1期46卷 23-28页

作者：陈桂娥容芳苟鑫孙荣航李作生陈瑞爱岭南现代农业科学与技术广东省实验室肇庆分中心广东肇庆526238 华南农业大学生命科学学院广东广州510642 华南农业大学兽医学院广东广州510642 华农(肇庆)生物产业技术研究院有限公司广东肇庆526238 肇庆大华农生物药品有限公司广东肇庆526238

为制备禽白血病病毒(ALV)p27蛋白特异性单克隆抗体,利用原核表达系统表达并纯化ALV p27蛋白,将其作为免疫原免疫注射Balb/c小鼠,用杂交瘤细胞融合和ELISA等筛选出阳性单克隆抗体细胞,对制备的单克隆抗体的抗体亚型、效价及特异性进行鉴... 详细信息

为制备禽白血病病毒(ALV)p27蛋白特异性单克隆抗体,利用原核表达系统表达并纯化ALV p27蛋白,将其作为免疫原免疫注射Balb/c小鼠,用杂交瘤细胞融合和ELISA等筛选出阳性单克隆抗体细胞,对制备的单克隆抗体的抗体亚型、效价及特异性进行鉴定,将目的蛋白截短成4段,初步鉴定单克隆抗体识别的抗原表位区域。结果表明,共筛选出4株单克隆细胞,其抗体亚类皆为IgG1型,其中3A1抗体效价为1∶64000,3B2为1∶256000,5F1为1∶128000,5G2为1∶8000;4株单克隆抗体识别的抗原表位在1-60 aa之间。研究结果为进一步建立ALV相关免疫学检测方法提供了重要的材料。

关键词：禽白血病病毒 p27蛋白单克隆抗体抗原表位

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