检索结果-南通市图书馆

Extension Operators Preserving Biholomorphic Mappings on Hartogs Domains

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2023年第2期44卷 307-324页

作者： Yanyan cui Heju yang Yuying QIAO College of Mathematics and Statistics Zhoukou Normal UniversityZhoukou 466001HenanChina College of Science Hebei University of Science and TechnologyShijiazhuang 050024China College of Mathematics and Information Science Hebei Normal UniversityShijiazhuang 050024China

In this paper,the authors extend the Roper-Suffridge operator on the generalized Hartogs *** mainly research the properties of the extended *** the characteristics of Hartogs domains and the geometric properties of subclasses of spirallike mappings,they obtain the extended Roper-Suffridge operator preserving almost starlikeness of complex orderλ,almost spirallikeness of typeβand orderα,parabolic spirallikeness of typeβand orderρon the Hartogs domains in different *** conclude that the corresponding extension operator preserves the same geometric invariance on the unit ball B^(n) in C^(n).The conclusions provide a new approach to study these geometric mappings in C^(n).

关键词： Roper-Suffridge operator Spirallike mappings Starlike mappings

The dynamic changes of arsenic biotransformation and bioaccumulation in muscle of freshwater food fish crucian carp during chronic dietborne exposure

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第2期33卷 74-81页

作者： Di cui Peng Zhang Haipu Li Zhaoxue Zhang yang Song Zhaoguang yang Center for Environment and Water Resources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Key Laboratory ofHuman Prouince for Water Environment and Agriculture Product Safety Central South UniversityChangsha 410083China School of Geography Earth and Environm ental SciencesUniversity of BirminghamEdgbastonBirminghamB152TTf UK

Dietary uptake is the major way that inorganic arsenic(iAs)enters into benthic fish;however,the metabolic process of dietborne i As in fish muscle following chronic exposure remains *** was a 40-day study on chronic dietborne i As[arsenite(AsⅢ)and arsenate(AsⅤ)]exposure in the benthic freshwater food fish,the crucian carp(Carassius auratus),which determined the temporal profiles of iAs metabolism and toxicokinetics during *** found that an adaptive response occurred in the fish body after iAs dietary exposure,which was associated with decreased As accumulation and increased As transformation into a non-toxic As form(arsenobetaine).The bioavailability of dietary AsⅢwas lower than that of AsⅤ,probably because AsⅢhas a lower ability to pass through fish *** AsⅤexhibited a high potential for transformation into AsⅢspecies,which then accumulated in fish *** largely produced AsⅢconsidered more toxic at the earlier stage of AsⅤexposure should attract sufficient attention to human exposure ***,the pristine As species and exposure duration had significant effects on As bioaccumulation and biotransformation in *** behavior determined for dietborne arsenic in food fish is crucial for not only arsenic ecotoxicology but also food safety.

关键词： Arsenic Adaptation Biotransformation Bioaccumulation Freshwater fish

Intraseasonal Variability of Summertime Surface Air Temperature over Mid-High-Latitude Eurasia and Its Prediction Skill in S2S Models

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2021年第5期35卷 815-830页

作者： Jing cui Shuangyan yang Tim LI Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environmental Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044China International Pacific Research Center and Department of Atmospheric Sciences School of Ocean and Earth Science and TechnologyUniversity of HawaiiHonoluluHI 96822USA

Features of the dominant modes of surface air temperature(SAT)on the intraseasonal timescale over the mid-highlatitude Eurasia(MHE)during boreal summer(June-September)are investigated based on the ERA5 reanalysis data from 1979 to *** intraseasonal variability(ISV)of SAT over MHE is primarily characterized by an eastward propagation along 60°N,which is found to impact the regional weather in China,including summertime extreme hot and cool *** forecast skill and potential predictability of the ISV of SAT over MHE are assessed for 5 dynamical models that have participated in the subseasonal-to-seasonal(S2 S)prediction project,by analyzing12 years’(1999-2010)model reforecast/hindcast *** using the principal component(PC)index of the leading intraseasonal SAT modes as a predictand,we found that the forecast skill for ISV of SAT can reach out to 11-17 days,and the ECMWF model exhibits the best *** the S2 S models tend to show 1)a relatively higher skill for strong intraseasonal oscillation(ISO)cases,2)a systematic underestimate of the amplitude of the SAT ISV signal,and 3)different skills during different phases of ISO *** of potential predictability based on the perfectmodel assumption reveals a 4-6-day skill gap for most models,and the skill gap also varies among different phases of ISO *** results imply the need for continued development of operational forecasting systems to improve the actual prediction skills for the ISV of SAT over MHE.

关键词： surface air temperature(SAT) intraseasonal variability(ISV) mid-high-latitude Eurasia(MHE) subseasonal-to-seasonal(S2S)prediction prediction skill predictability

The effect of dissolved oxygen concentration on long-term stability of partial nitrification process

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第4期32卷 343-351页

作者： Bin cui Qing yang Xiuhong Liu Siting Huang Yubing yang Zhibin Liu National Engineering Laboratory for Aduanced Municipal Wastewater Treatment and Reuse Technology Beijing University of TechnologyBeijing 100124China

Dissolved oxygen(DO)concentration is regarded as one of the crucial factors to influence partial nitrification ***,achieving and keeping stable partial nitrification under different DO concentrations were widely *** mechanism of DO concentration influencing partial nitrification is still ***,in this study two same sequencing batch reactors(SBRs)cultivated same seeding sludge were built up with realtime control *** DO concentrations were controlled in SBRs to explore the effect of DO concentration on the long-term stability of partial nitrification process at room *** was discovered that ammonium oxidation rate(AOR)was inhibited when DO concentration decreased from 2.5 to 0.5 mg/*** abundance of Nitrospira increased from 1011.5 to 1013.7 copies/g DNA,and its relative percentage increased from 0.056%to 3.2%during 190 operational cycles,causing partial nitrification gradually turning into complete nitrification ***,when DO was 2.5 mg/L the abundance of Nitrospira was stable and AOB was always kept at 1010.7 copies/g *** AOR was maintained,and stable partial nitrification process was *** oxidizing bacteria(AOB)activity was significantly higher than nitrite oxidizing bacteria(NOB)activity at DO of 2.5 mg/L,which was crucial to maintain excellent nitrite accumulation performance.

关键词： Partial nitrification Dissolved oxygen Ammonium oxidation rate Nitrospira Nitrogen removal

Potential application of radiant floor cooling systems for residential buildings in different climate zones

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2024年第4期17卷 543-560页

作者： Mengying cui yang Song Yudong Mao Kaimin yang Jiying Liu Zhe Tian School of Thermal Engineering Shandong Jianzhu UniversityJinan250101China School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Key Lab of Building Environment and Energy of Tianjin Tianjin UniversityTianjin300072China

A radiant floor cooling system(RFCS)is a high-comfort and low energy consumption system suitable for residential *** floor systems usually work with fresh air,and their operating performance is affected by climatic *** and outdoor environmental disturbances and the system’s control strategy affect the indoor thermal comfort and energy efficiency of the ***,a multi-story residential building model was established in this *** system simulation program was used to study the operation dynamics of three control strategies of the RFCS based on the calibrated ***,the performance of the control strategies in five climate zones in China were compared using multi-criteria decision-making in *** results show that control strategy has a negligible effect on condensation risk,but the thermal comfort and economic performance differ for different control *** adaptability of different control strategies varies in different climate zones based on the consideration of multiple *** performance of the direct-ground cooling source system is better in Hot summer and warm winter *** variable air volume control strategy scores higher in Serve cold and Temperate zones,and the hours exceeding thermal comfort account for less than 3%of the total simulation ***,it is suggested to choose the RFCS control strategy for residential buildings according to the climate zone characteristics,to increase the energy *** results provide a reliable reference for implementing RFCSs in residential buildings.

关键词： control strategy radiant floor cooling system residential building energy efficiency climate zones

Oligodendrocyte transcription factor 1 overexpression promotes oligodendrocyte transcription factor 2 expression in the brains of neonatal rats exposed to hypoxia

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2011年第34期6卷 2713-2717页

作者： Lijun yang Hong cui Aijun yang Wenxing Jiang Department of Pediatrics Beijing Friendship Hospital Capital Medical University Beijing 100050 China

To examine the expression profiles of oligodendrocyte transcription factors 1 and 2 （Oligl and Olig2） and the interaction between these two proteins, Oligl was transfected into the lateral ventricles of neonatal rats subjected to hypoxia. Immunohistochemistry demonstrated that Olig2 was expressed throughout the nuclei in the brain, and expression increased at 3 days following hypoxia and was higher than levels at 7 days following Ad5-Oligl transfection. Western blot revealed that Oligl and Olig2 expression increased in Oligl-transfected brain cells 3 days after hypoxia, but Oligl and Olig2 expression decreased at 7 days. These results indicate that Oligl overexpression enhances Olig2 expression in brain tissues of hypoxia rats.

关键词： oligodendrocyte transcription factor 1 oligodendrocyte transcription factor 2 hypoxia neonatal rat gene transfection neural regeneration

The effect of conical flowfields on the performance of waveriders at Mach 6

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第1期52卷 57-64页

作者： cui Kai yang GuoWei Key Laboratory of High Temperature Gas Dynamics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116023 China

The performance of 23 kinds of waveriders, derived from different conical flowfields, is analyzed by the numerical computation under the conditions of fight speed of Mach 6, attack angle of 0° and flight alti- tude of 30 km. These results indicate that the performance is influenced by the shapes and the width to height ratios (W/H ) of generating cones. The geometrical parameter and the lift coefficient are propor- tional to W/H, while the drag coefficient and the lift to drag ratio (L/D ) have extreme values. Considering the base drag and the computation errors, the waverider with the highest L/D is cut from the elliptical cone’s flowfield (W/H = 1.5―1.618), and the configuration with the lowest drag can also be obtained at W/H = 1:1.5. Accordingly, good suggestions are proposed for practical design based on these compu- tational results.

关键词：高超声速风洞波纹度火箭动力学

Enhanced second-order Stark effect in twisted bilayer graphene quantum dots

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第11期14卷 3935-3941页

作者： Xian Wang Yingqi cui Li Zhang Mingli yang Institute of Atomic and Molecular Physics Sichuan UniversityChengdu610065China School of Physics and Electronic Engineering Zhengzhou Normal UniversityZhengzhou450044China

External electric field and interlayer twist introduce diverse changes in their confined electronic states of bilayer graphene quantum dots. Using a quantum-dot model, the band gaps of twisted bilayer graphene in finite sizes of about 1.4–2.4 nm with varying twist angles are studied in the presence of an electrostatic field perpendicular to the flakes by means of first-principles calculations. The size-dependent gaps are widened by the interlayer twist, but narrowed by the applied field. Their coupling, however, results in an enhanced Stark response in the twisted structures of which the field-induced band-gap variations are about 3–4 times as large as that of the corresponding untwisted structures under the same field strength. The exceptional Stark shifts come from the field-induced asynchronous shifts in their occupied and virtual energy levels, which are further enhanced by strong interlayer coupling at specific twist angles. Moreover, the shift of band gaps with the field strength follows the quadratic Stark response with large second-order shifting coefficients. The enhanced and tunable Stark shift suggests a gateway to the band engineering of bilayer graphene quantum dots by tuning their sizes, twist angles and their coupling with applied field.

关键词： twisted bilayer graphene electric field Stark effect first-principles calculations

Variational Gridded Graph Convolution Network for Node Classification

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2021年第10期8卷 1697-1708页

作者： Xiaobin Hong Tong Zhang Zhen cui Jian yang Key Laboratory of Intelligent Perception and Systems for High-Dimensional Information of Ministry of Education School of Computer Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China

The existing graph convolution methods usually suffer high computational burdens,large memory requirements,and intractable *** this paper,we propose a high-efficient variational gridded graph convolution network(VG-GCN)to encode non-regular graph data,which overcomes all these aforementioned *** capture graph topology structures efficiently,in the proposed framework,we propose a hierarchically-coarsened random walk(hcr-walk)by taking advantage of the classic random walk and node/edge *** hcr-walk greatly mitigates the problem of exponentially explosive sampling times which occur in the classic version,while preserving graph structures *** efficiently encode local hcr-walk around one reference node,we project hcrwalk into an ordered space to form image-like grid data,which favors those conventional convolution *** of the direct 2-D convolution filtering,a variational convolution block(VCB)is designed to model the distribution of the randomsampling hcr-walk inspired by the well-formulated variational *** experimentally validate the efficiency and effectiveness of our proposed VG-GCN,which has high computation speed,and the comparable or even better performance when compared with baseline GCNs.

关键词： Graph coarsening gridding node classification random walk variational convolution