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Body size induced changes in metabolic carbon of soil nematodes under N deposition and precipitation regime change in a temperate grassland

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Ecological Processes 2024年第1期13卷 120-131页

作者： Shuyan cui Xiaomei Mo guo Zheng College of Life Science Shenyang Normal University

Background Global climate change has resulted in precipitation regimes exhibiting an increasing trend in rainfall intensity but a reduction in its frequency. Nitrogen(N) deposition is a crucial component of the global N cycling. Nematode body size is a trait that responds to climate change and is used as a standard trait-based indicator in soil community analysis. Variations in body size influence metabolic carbon(C). We examined the ways by which body size and metabolic C of nematodes respond to changing precipitation regimes and how N deposition regulates these responses by an 8-year manipulative *** Nematode body size was indicated by the community-weighted mean(CWM) mass. We quantified C metabolism components of soil nematodes including production C, respiration C, and corresponding C use efficiency(CUE) under different precipitation intensities and N addition in a semi-arid steppe on the Mongolian Plateau. The Mantel test was used to determine the correlations between CWM, CUE and environmental factors. The partial least squares path modeling(PLS-PM) was conducted to quantify direct or indirect contributions among latent *** We found that heavy precipitation intensity increased the CWM mass of total nematodes and omnivorespredators without N addition. N addition decreased CWM mass of bacterivores across all the precipitation intensity treatments. Stronger precipitation intensities might be favorable for nematode production and respiration C. Variations in the nematode CWM mass drove the CUE to change with N *** Our findings provide new insights into the mechanisms underlying nematode body size and C metabolism, and highlight that explorative studies, such as manipulative experiments, are needed to identify traits underlying size-related effects and to investigate how they affect CUE of nematodes. These efforts may increase our understanding of how changes in precipitation regimes and N deposition may alter soil nema

关键词： Community-weighted mean Metabolic footprint Nitrogen addition Precipitation intensity

Optimization and Configuration of Control Parameters to Enhance Small-signal Stability of Hybrid LCC-MMC HVDC System

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 213-221页

作者： Chunyi guo Peng cui Chengyong Zhao School of Electrical Engineering North China Electric Power UniversityBeijing 102206China

This paper investigates the small-signal stability of the hybrid high-voltage direct current(HVDC)transmission *** system is composed of line commutated converter(LCC)as rectifier and modular multi-level converter(MMC)as inverter under weak AC grid ***,the impact of short-circuit ratio(SCR)at inverter side on the system stability is investigated by eigen-analysis,and the key control parameters which have major impact on the dominant mode are identified by the participation factor and sensitivity ***,considering the quadratic index and damping ratio characteristic,an objective function for evaluating the system stability is developed,and an optimization and configuration method for control parameters is presented by the utilization of Monte Carlo *** eigenvalue results and the electromagnetic transient(EMT)simulation results show that,with the optimized control parameters,the small-signal stability and the dynamic responses of the hybrid system are greatly improved,and the hybrid system can even operate under weak AC grid condition.

关键词： Hybrid high-voltage direct current(HVDC) line commutated converter(LCC) modular multi-level converter(MMC) optimization of control parameter

Energy-saving and economic analysis of passive radiative sky cooling for telecommunication base station in China

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Building Simulation 2022年第10期15卷 1775-1787页

作者： Zengkai cui Chenyue guo Dongliang Zhao School of Energy and Environment Southeast UniversityNanjing 210096China Engineering Research Center of Building Equipment Energyand EnvironmentMinistry of EducationChina

The widespread application of 4G and the rapid development of 5G technologies dramatically increase the energy consumption of telecommunication base station (TBS). Remarkably, the air conditioning system accounts for a significant part of energy consumption in TBS. In this work, passive radiative sky cooling technology has been studied to explore its application potential for TBS. We built a simulation model in DeST to investigate the effect of various envelope thermophysical properties on TBS energy saving. The main influencing factors of the radiative sky cooling on TBS energy saving have been concluded and guidance has been raised for further application. An optimized envelope design combining radiative sky cooling with appropriate heat transfer coefficients has been proposed. The energy-saving and economic analysis of the optimized envelope design at different areas shows that, except for the low heat density TBS in severe cold areas, the annual energy-saving rate is 6.77%–64.29%, and the annual total energy saving is 21.94 kWh/m2–52.74 kWh/m2. The payback period is 1.55–4.67 years, and the maximum acceptable cost limited to a 5-year payback period is $3.21/m2–$9.67/m2.

关键词： telecommunication base station radiative sky cooling energy saving economic analysis

Interaction between a screw dislocation and an elliptical hole with two asymmetrical cracks in a one-dimensional hexagonal quasicrystal with piezoelectric effect

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Applied Mathematics and Mechanics(English Edition) 2020年第6期41卷 899-908页

作者： Lianhe LI Xiaowei cui Junhong guo College of Mathematics Science Inner Mongolia Normal UniversityHohhot 010022China Department of Mechanics Inner Mongolia University of TechnologyHohhot 010051China

The interaction between a screw dislocation and an elliptical hole with two asymmetrical cracks in a one-dimensional(1 D) hexagonal quasicrystal with piezoelectric effect is considered. A general formula of the generalized stress field, the field intensity factor, and the image force is derived, and the special cases are discussed. Several numerical examples are given to show the effects of the material properties and the dislocation position on the field intensity factors and the image forces.

关键词： screw dislocation elliptical hole conformal mapping stress field onedimensional(1D)hexagonal quasicrystal with piezoelectric effect

Non-malleable Extractor in the Presence of Classical or Quantum Side Information

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Chinese Journal of Electronics 2019年第5期28卷 938-943页

作者： LIU Yipeng guo Jiansheng cui Jingyi Information Science and Technology Institute Zhengzhou

Non-malleable extractor is an important tool for studying the problem of privacy amplification in classical and quantum cryptography with an active adversary. The randomness of the weakly-random source X before privacy amplification always depends on the information adversary has, called side information. We study properties of such extractors in the presence of classical and quantum side information, and show that any non-malleable extractor is essentially secure in the case where the adversary has classical side *** also prove that non-malleable extractors are quantumproof with uniform seed, or only require the seed to be weakly random.

关键词： Quantum cryptography Privacy amplification Randomness extractors Non-malleable Classical and quantum side information

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电子对抗对防空作战效果影响的定量评估

兵器装备工程学报 2016年第6期37卷 170-173页

作者：姜广顺于海涛黄院生崔国峰余硕空军二十三厂解放军93655部队

提出了一种无线电电子对抗兵力兵器对防空部队作战效能贡献的评估方法;结合仿真结果,分析了将杀伤兵器引导至目标的概率与引导均方根误差之间,目标杀伤概率与空袭兵器无线电电子设备遭受无线电压制之间的关系;提出了应该在对目标探测、... 详细信息

提出了一种无线电电子对抗兵力兵器对防空部队作战效能贡献的评估方法;结合仿真结果,分析了将杀伤兵器引导至目标的概率与引导均方根误差之间,目标杀伤概率与空袭兵器无线电电子设备遭受无线电压制之间的关系;提出了应该在对目标探测、引导、杀伤兵器进行无线电电子对抗和火力杀伤的防空部队和兵力合同行动进行效能评估的基础上,拟定不同环境条件下的部队指挥方法。

关键词：电子对抗防空作战定量评估

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温度对生物活性炭反应器净水效能的影响研究

东北电力大学学报 2011年第5期31卷 151-154页

作者：杨世东刘志东张兰河崔凤国于雷潘强东北电力大学建筑工程学院吉林吉林132012 东北电力大学化学工程学院吉林吉林132012 吉林市市政设施管理处吉林吉林132011 吉林油田公司公用事业管理公司吉林松原138000

为考察温度变化对生物活性炭反应器净水效能的影响,分别研究了在5-18℃和19-26℃两个温度范围内反应器对高锰酸盐指数、硝态氮、浊度及UV254的去除情况。结果表明:单级生物活性炭反应器对高锰酸盐指数平均值为4.51 mg/L的原水净化能力有... 详细信息

为考察温度变化对生物活性炭反应器净水效能的影响,分别研究了在5-18℃和19-26℃两个温度范围内反应器对高锰酸盐指数、硝态氮、浊度及UV254的去除情况。结果表明:单级生物活性炭反应器对高锰酸盐指数平均值为4.51 mg/L的原水净化能力有限,但常温条件下的效果明显优于低温条件(高锰酸盐指数去除率分别为15.90%和4.38%)。另外,硝态氮的去除也受到低温因素的影响。浊度和UV254在不同温度条件下的去除率没有明显的变化,且UV254随温度的变化表现出明显的滞后性。因此,利用生物活性炭净水装置降低水中高锰酸盐指数和硝态氮时,应避免运行温度降低。在5℃-26℃范围内以降低浊度和UV254为处理目的运行中温度的变化不会明显影响其去除效果。

关键词：生物活性炭硝态氮浊度 UV254 温度高锰酸盐指数

Stable Lagrangian numerical differentiation with the highest order of approximation

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Science China Mathematics 2006年第2期49卷 225-232页

作者： WANG Xinghua cui feng Department of Mathematics Zhejiang University Hangzhou 310028 China Department of Mathematics Zhejiang University Hangzhou 310028 China

Some asymptotic representations for the truncation error for the Lagrangian numerical differentiation are presented, when the ratio of the distance between each interpolation node and the differentiated point to step-parameter h is known. Furthermore, if the sampled values of the function at these interpolation nodes have perturbations which are bounded by ε, a method for determining step-parameter h by means of perturbation bound ε and order n of interpolation is provided to saturate the order of approximation. And all the investigations in this paper can be generalized to the set of quasi-uniform nodes.

关键词： Lagrangian numerical differentiation truncation error stability saturation approximation superconvergence

D DT Theorem over square-free numbers in short interval

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Frontiers of Mathematics in China 2017年第2期12卷 367-375页

作者： Bin feng Zhen cui School of Mathematics Sciences Shanghai Jiao Tong University Shanghai 200240 China College Of Mathematics and Statistics Yangtze Normal University Fuling 408100 China

We study the Cesaro means related to the divisor function. We show that the DDT Theorem holds over square-free numbers in short interval, which generalizes some results established by Deshouillers-Dress-Tenenbaum and ... 详细信息

关键词： Selberg-Delang method arcsine law square-free number