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PREPARATION　OF　SPHERICAL，　MONODISPERSED　NANOMETER　Eu_2O_3　PARTICLES

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Chinese Chemical Letters 1995年第10期6卷 915-918页

作者： Jun MA qi jie yan(Department of Chemistry, Nanjing University, Nanjing 210093) Nanjing Univ Dept Chem Nanjing 210093 Peoples R China

Spherical, monodispersed europium hydroxycarbonate particles wereobtained by homogeneous precipitation with urea in aqueous solution of Eu.(NO3)3at elevated *** particles were readily converted to the uniformEu2O3 wit... 详细信息

关键词： Eu2O3 MONODISPERSED NANOMETER OF PARTICLES

Hybrid Analytical and Data-Driven Model Based Instance-Transfer Method for Power System Online Transient Stability Assessment

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1664-1675页

作者： Feng Li qi Wang Yi Tang yan Xu jie Dang School of Electrical Engineering Southeast UniversityNanjing 210000China Center for Power Engineering(CPE) School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore Central China Branch of State Grid Corporation of China Wuhan 430077China

Data-driven methods are widely recognized and generate conducive results for online transient stability ***,the tedious and time-consuming process of sample collection is often *** functioning of power systems involves repetitive sample collection due to the constant variations occurring in the operation mode,thereby highlighting the importance of collection *** a means to achieve high sample collection efficiency following the operation mode change,we propose a novel instance-transfer method based on compression and matching strategy,which facilitates the direct acquisition of useful previous samples,used for creating the new sample ***,we present a hybrid model to ensure rationality in the process of sample similarity comparison and selection,where features of analytical modeling with special significance are introduced into data-driven *** the same time,a data-driven method can also be integrated in the hybrid model to achieve rapid error correction of analytical models,enabling fast and accurate post-disturbance transient stability *** a paradigm,we consider a scheme for online critical clearing time estimation,where integrated extended equal area criterion and extreme learning machine are employed as analytical model part and data-driven error correction model part,*** results validate the credible efficacy of the proposed method.

关键词： Critical clearing time extreme learning machine instance-transfer method transient stability assessment

HYDROGENATION OF CARBON MONOXIDE TO LIGHT OLEFINS ON IRON CATALYSTS PROMOTED WITH ZIRCONIA

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Chinese Chemical Letters 1995年第6期6卷 521-522页

作者： Kai Done CHEN Yi Nine FAN qi jie yan (Department of Chemistry.Nanjiug University,Nanjiug 210093) Nanjing Univ Dept Chem Nanjing 210093 Peoples R China

Fe2O3/ZrO2 catalysts were used for CO hydrogenation. For 7%wt Fe2O3/ZrO2, the F-T products distribution significantly deviated from the Schulz-Flory rule and selectivity to light olefins was enhanced.

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First Synthesis of Zirconia-pillared Layered Lanthanum Niobate

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Chinese Chemical Letters 2000年第2期11卷 179-180页

作者： Lin XU Wen Hua HOU1 Can Xiong GUO qi jie yan (Department of Chemistry, Nanjing University, Nanjing 210093) Department of Chemistry Nanjing University Nanjing 210093 China

A zirconia-pillared layered lanthanum niobate was prepared by first preswelling layered HLaNb2O7 with n-hexadecylamine(n-C16H33NH2), then further reacting with zirconyl chloride aqueous solution, and finally calcining the resultant solid product in air. The obtained new material has an interlayer spacing of 1.36nm, and a high thermal stability above 700 degrees C.

关键词： layered lanthanum niobate zirconia pillaring preparation

A real-time calibration method based on time-to-digital converter for accelerator timing system

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Nuclear Science and Techniques 2024年第9期35卷 127-140页

作者： qi-Hao Duan Liang Ge yan-Hao Jia jie-Yu Zhu Wei Zhang Institute of modern physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

The high-intensity heavy-ion accelerator facility(HIAF)is a scientific research facility complex composed of multiple cas-cade accelerators of different types,which pose a scheduling problem for devices distributed over a certain range of 2 km,involving over a hundred *** white rabbit,a technology-enhancing Gigabit Ethernet,has shown the capability of scheduling distributed timing devices but still faces the challenge of obtaining real-time synchronization calibration param-eters with high *** study presents a calibration system based on a time-to-digital converter implemented on an ARM-based System-on-Chip(SoC).The system consists of four multi-sample delay lines,a bubble-proof encoder,an edge controller for managing data from different channels,and a highly effective calibration module that benefits from the SoC *** performance was evaluated with an average RMS precision of 5.51 ps by measuring the time intervals from 0 to 24,000 ps with 120,000 data for every *** design presented in this study refines the calibration precision of the HIAF timing *** eliminates the errors caused by manual calibration without efficiency loss and provides data support for fault *** can also be easily tailored or ported to other devices for specific applications and provides more space for developing timing systems for particle accelerators,such as white rabbits on HIAF.

关键词： HIAF White rabbit Calibration system Time-to-digital converter(TDC)

Genome-Wide Characterization of the Hyaluronidase Gene Family and Their Potential Roles in Viviparous Black Rockfish(Sebastes schlegeli)

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Journal of Ocean University of China 2024年第2期23卷 487-498页

作者： LIU Zhiying NIU Jingning ZHAO Xi LIU Huaxiang LI Zibin HE yan qi jie MOE Key Laboratory of Marine Genetics and Breeding College of Marine Life SciencesOcean University of ChinaQingdao 266003China Key Laboratory of Tropical Aquatic Germplasm of Hainan Province Sanya Oceanographic InstituteOcean University of ChinaSanya 572025China

Black rockfish(Sebastes schlegelii)has evolved viviparous reproduction *** from the oviparous fishes,the spermatozoa of black rockfish are stored on the surface of ovarian follicle for over four months until the egg mature in ovary,while the adaptive evolution of fertilization-related genes remains to be *** the present study,based on the genome and transcriptome information of black rockfish,a total of 10 hyaluronidase genes were identified by phylogenetic and sequence analyses,including hyal1,hyal2,hyal3,hyal4,hyal6 and spam1a,spam1b,spam1c and *** spam1 subfamilies,including spam1a,spam1b,spam1c and spam1d,were significantly expanded compared to other *** adaptive evolution of hyaluronidase was further investigated by selection pressure analysis of branch model and branch site *** results showed that only spam1 subfamily was positively selected with a large number of positive selection sites,and the evolution rate was significantly higher thanthose of other *** positively selected sites,LYS-171 and GLY-164,were located in the neutral hyaluronidase activity domain,which was pivotal for SPAM1 to participate in enzymatic hydrolysis of the extracellular hyaluronic acid matrix and mediate acrosome reaction in ***,spam1 was mainly expressed in spermatocytes,secondary spermatocytes,and spermatids of testis,whereas it was not found in metamorphic sperm and mature sperm based on the spatiotemporal expression *** results indicated that spam1 might originate from the testis and might be an adaptation of viviparous trait in black rockfish.

关键词： adaptation of viviparous black rockfish(Sebastes schlegelii) hyaluronidase selective pressure analysis

Damping capacity of Fe_(83)Ga_(17) magnetostrictive alloy under magnetic field

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Rare Metals 2024年第1期43卷 402-409页

作者： Shao-Wen yan Xing Mu Bing-jie Liu Li-Hong Xu Shi-Hai Guo yan qi Hong-Ping Zhang Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China

The damping performance of Fe_(83)Ga_(17) alloys has been investigated in the static magnetic field (H). The results demonstrate that the damping peak value can be adjusted between 0.020 and 0.085 under the magnetic f... 详细信息

关键词： alloy magnetic alloys

Magnitude and direction of temperature variability affect hospitalization for myocardial infarction and stroke:population-based evidence from Guangzhou,China

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Frontiers of Environmental Science & Engineering 2024年第3期18卷 1-11页

作者： Zhou yang Murui Zheng Ze-Lin yan Hui Liu Xiangyi Liu jie-qi Jin Jiagang Wu Chun-Quan Ou State Key Laboratory of Organ Failure Research Department of BiostatisticsGuangdong Provincial Key Laboratory of Tropical Disease ResearchSchool of Public HealthSouthern Medical UniversityGuangzhou 510515China Guangzhou Center for Disease Control and Prevention Guangzhou 510440China

Relationships between nonoptimal temperatures and cardiovascular disease(CVD)mortality have been well ***,evidence of the association between temperature variability(TV)and CVD morbidity is *** study aimed to quantify the risk and burden of CVD-related hospitalization associated with the magnitude and direction of *** on meteorology and population-based hospitalizations for myocardial infarction(MI)and stroke were collected in Guangzhou,China,from 2013 to *** temperature variability(HTV)was measured as the standard deviation of hourly temperature records over specific exposure *** direction(upward or downward)of HTV was defined as the average daily mean temperature change relative to that of the previous day during the exposure ***-Poisson regression was applied to assess the impact of HTV after adjusting for the daily mean temperature,and the hospitalization fractions attributable to HTV were calculated.A 1℃-increase in HTV was significantly associated with a 2.24%and 1.72%increase in hospitalizations for MI and hemorrhagic stroke(HS)at lag 0–1 d,respectively,and a 1.55%increase in hospitalizations for ischemic stroke(IS)at lag 0–3 *** the study period,5.99%,4.64%,and 4.53%of MI,HS,and IS hospitalizations,respectively,were attributable to *** upward TV exerts acute effects on CVD hospital admissions,whereas the impact of downward TV generally *** findings highlight the importance of the magnitude and direction of temperature fluctuations,in addition to the mean level,in assessing the adverse health impacts of temperature variations.

关键词： Hourly temperature variability Cardiovascular Hospitalization Direction China

Structure　of　Activity　Sites　in　Perovskite－type　Complexs　Oxides　LaMnO_3＋λ　for　Total　Oxidation　of　Methane

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Chinese Chemical Letters 1996年第10期7卷 960-961页

作者： Zi Yi ZHONG Jian GONG qi jie yan Xian Cai FU(Department of Chemistry, Hunan Normal University, Changsha, 410081)(Department of Chemistry, Nanjing University, Nanjing, 210093) Department of Chemistry Hunan Normal University Changsha 410081 Department of Chemistry Nanjing University Nanjing 210093

Nanometer oxide LaMnO3+λ and its counterparts with large particle size were comparatively studied for total oxidation of methane. XPS, TPR and nonstoichiometric oxygen (λ)analysis results identify that the nanometer chide contains more high valence cations, to which the adjacent lattice oxygen are responsible for total oxidation of methane at low temperature.

关键词： Activity Sites Structure Perovskite Complexs type