Results 11 to 20 of about 6,902 (167)
Research for Inertia Response and Primary Frequency Regulation Ability of Wind Turbine [PDF]
, 2023 [Introduction] Large-scale connection of wind power to the power grid poses great challenges to the stability (especially frequency stability) of grid operation.In order to solve the problem of inadequate frequency regulation capability caused by large ...
Jiangtao GUO +4 more
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Research of FM Underwater Acoustic Voice Communication under Multi-path Channels [PDF]
, 2015 随着人类对海洋大规模开发的不断深入，海洋的开发和科研工作对海洋信息传输的需求愈发迫切。大量海洋资源勘探、海洋开发和军事活动等对水声语音通信的需求使得水声语音通信技术日益受到重视。然而水声信道复杂的时空变化特性、多径效应、强噪声等恶劣条件对高性能水声语音通信的研究和设计带来了极大的挑战。 调频(FM,FrequencyModulation)技术是继单边带调制(SSB)后被普遍运用的一种水声语音通信调制解调方法，其具有抗干扰性能好、易于实现等特点。然而，由于浅海信道所具有的强多径、强背景噪声等恶劣条件 ...
曾堃
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The comparison of underwater acoustic FM speech communication methods in shallow water channels [PDF]
, 2017 水声语音通信在海洋工程、海洋科考、水下搜救等领域具有广泛应用。与单边带通信、数字编码调制通信相比,调频水声语音通信具有实现简单方便、抗幅度衰落性能好的特点,但浅海水声信道具有的复杂多径效应及噪声严重影响其获得的语音音质,容易出现语音含混、语义难辨等问题。本文通过浅海不同距离、不同多径信道下的海试实验比较了采用非线性解调法和正交解调法的调频语音通信性能,并通过客观语音质量评估PESQ（Perceptual evaluation of speech quality）方法对调频水声语音通信音质进行量化评估 ...
李剑汶, 王小阳, 童峰
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Justice in coexistence: Pastoralism and large carnivores on the Qinghai‐Tibet Plateau
People and Nature, EarlyView.Abstract The conflict between livestock husbandry and large carnivore conservation presents significant challenges in grassland ecosystems worldwide. Achieving sustainable coexistence among herders, livestock and large carnivores requires reconciling diverse perspectives and interests through equitable, inclusive and fair processes that address both ...
Yufang Gao, Yue Yu
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Study on Signal Processing Key Technology of Millimeter FMCW Radar [PDF]
, 2016 毫米波调频连续波(FMCW)雷达质量轻，体积较小，易于高度工业集成，工作频带较宽，分辨率高，具有较好的全天候工作能力，并且抗干扰能力强，从而使得毫米波FMCW雷达在汽车防撞、环境遥感、工业控制、战场监视、精确制导等民用和军用领域中有着广泛的应用前景。因此，本文以毫米波FMCW雷达信号处理为题，展开了如下几个方面的工作： (1)介绍了毫米波FMCW雷达的系统结构；对线性调频信号模型进行了分析，并比较了匹配滤波方法与去斜方法，给出了线性调频波形的模糊函数；介绍了锯齿波与三角波的运动参数估计原理 ...
陶明亮
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Experiment and Dynamic Characteristics Simulation of Primary Frequency Regulation of a 660 MW Nuclear Power Unit [PDF]
, 2023 The operation mode of nuclear power units is very different from that of thermal power units, and the specific data on the response of relevant nuclear power units to grid frequency changes are relatively lacking at present.
TANG Ping
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Studies have shown that organisms may adjust metabolic rates in response to thermal variability, highlighting metabolic plasticity as a key adaptive mechanism. Understanding the extent of metabolic plasticity of an organism is key to predicting its adaptation to climate
Qian Hu +6 more
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He jishu超导腔的频率稳定性是超导质子直线加速器稳定运行的关键。频率调谐器作为超导腔系统的重要组成部分，用于补偿或抑制在超导腔运行过程中由于液氦压力波动、洛伦兹力、束流负载效应和麦克风效应等因素导致的腔体频率失谐，从而确保超导腔的谐振频率与加速器的主参考源频率保持一致。针对HWR010铜铌复合超导腔的高机械强度和大体积特点，以及腔体对频率调谐高精度和快响应的需求，研发了一套氦气驱动的机械频率调谐器，该系统通过脉冲调制控制，实现了在低温、真空和辐射等恶劣环境下的稳定运行。利用ANSYS软件设计了调谐器的机械结构 ...
刘 鲁北 +7 more
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Study on A Novel Frequency Tunable Piezoelectric Vibration Energy Harvesting Device [PDF]
, 2015 随着传感器技术、嵌入式计算机技术、无线通信技术的快速发展，无线传感器网络（WSN）得到了广泛应用。传统电源已无法满足无线传感器网络应用的要求，因此俘获环境能量并将其转换为电能为无线传感器供电成为传统电源的一种替代方案。环境中的振动能凭借能量来源广泛、收集方便的特点而成为了很具吸引力的环境能量源。振动能量的回收方式主要有三种，即电磁式、静电式和压电式。其中压电俘能方式可以直接将施加的应变能转化成电能，适用于各种尺度，结构相对简单，无需额外的电源，而且易于集成 ...
李营泰
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Handling Homographs in Neural Machine Translation
, 2018 Homographs, words with different meanings but the same surface form, have long caused difficulty for machine translation systems, as it is difficult to select the correct translation based on the context.
Liu, Frederick, Lu, Han, Neubig, Graham
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