Results 31 to 40 of about 93,560 (164)
Gongye shui chuli, 2020 以交流异步电机、多级离心水泵及反渗透膜系统的运行特性为基础，明确了特定反渗透系统在恒通量及恒收率的运行条件下，回流调节、截流调节与变频调速3种系统运行调节方式的特点；分析了3种运行调节方式各自的能耗水平，论证了变频调速方式是反渗透系统最为节能的运行调节方式。
赵冲 +4 more
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International Journal of Applied Linguistics, Volume 36, Issue 3, Page 2808-2821, August 2026.ABSTRACT This study investigates how the learner‐related factors of language dominance, encompassing language history, proficiency, use, and attitude, modulate congruency effects in multi‐word unit (MWU) processing among early bilinguals. Seventy Cantonese–Putonghua bilinguals completed lexical decision tasks measuring reaction time and accuracy for ...
Mingjia Cai, Yuan Liang
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Gaoya dianqi, 2005 提出了一种基于高斯线调频小波变换诊断电机故障的新方法。线调频小波变换是信号的时间-频率-尺度变换, 具有比小波变换及其它时频分析更强的非平稳信号分析功能。利用高斯线调频小波变换作电机故障信号的能量谱估计,可提取电机故障信号的频率成份。试验结果表明,这种方法比Fourier变换和小波变换频率分布的能量更集中。
胡国胜, 朱锋峰, 任震, 涂用军
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Politics &Policy, Volume 54, Issue 4, August 2026.ABSTRACT After 2013, the number of statewide minimum wage increases in the United States surged. However, not every state followed the trend. Some refrained from minimum wage legislation completely. This article examines the causes of differences in state minimum wage policies from 2013 to 2022, taking a qualitative perspective on minimum wage politics
Emanuel Schuller
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The Effects of Policy Success Versus Failure Narratives
Policy Studies Journal, Volume 54, Issue 3, August 2026.ABSTRACT While public policies usually have mixed effects, succeeding at some aspects and failing at others, this nuance is often lost in public discourse when political actors like advocacy groups and politicians strategically emphasize either the successes or failures of particular policies.
Sarah Pralle, Emily Thorson
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, 2011 激光通过光纤传输时,线宽越窄,受激布里渊散射的阈值就越 低。高功率激光很容易产生受激布里渊散射,影响光信号的传输。对大功率半导体激光器进行小信号电流调制是解决这一问题的方法之一。在正弦小信号调制电流作 用下,分布反馈式半导体激光器(DFB-SLD)输出的激光会发生频率偏移,光源线宽展宽,从而可以提高受激散射阈值,进而降低传输损耗。通过理论分析, 给出了在正弦小信号低频调制电流作用下激光频率偏移量与调制电流幅度和频率关系的数学模型,进而设计相应的光路和电路进行实验测量,并借助数据拟合的方法 ...
孙传东, 阎得科, 钟镇
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Guangtongxin yanjiu, 2017 针对可见光通信系统调制带宽有限的问题,提出了将两种具有高频带利用率的调制方式应用于可见光通信系统的方案。分别论述了正交频分复用和奈奎斯特单载波调制的基本原理和产生途径,仿真验证了正交频分复用和奈奎斯特单载波两种调制解调技术应用于可见光通信系统时的性能,比较分析了两种技术在不同信噪比条件下的误码率和频带利用率,仿真结果表明,奈奎斯特单载波相对于正交频分复用有更高的频带利用率和较低的误码率,更适用于可见光通信系统。
王颖 +7 more
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Justice in coexistence: Pastoralism and large carnivores on the Qinghai‐Tibet Plateau
People and Nature, Volume 8, Issue 7, Page 2186-2199, July 2026.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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, 2011 提出并实现了一种用于微弱极低频信号探测的干涉式光纤传感器相位生成载波(PGC)解调方法.对PGC解调方法中微分交叉相乘(DCM)及反正切(Arctangent)两种相位抽取算法应用于极低频信号解调进行了理论分析和算法仿真,其结果表明,DCM式PGC算法解调极低频信号时,其结果中存在直流漂移,而Arctangent式PGC算法的解调结果中不存在直流漂移问题.进而基于光纤干涉仪搭建了极低频光纤传感系统,并进行了两种PGC解调算法的对比实验,实验结果表明 ...
王林, 刘育梁, 李芳, 何俊
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Guangtongxin yanjiu, 2009 文章从理论上推导出了载波抑制归零（CSRZ）码和差分正交相移键控（DQPSK）的调制解调原理公式,给出了实现的具体过程,以及仿真得到的调制后的频谱图和解调后的眼图。结果表明,CSRZ-DQPSK作为新型多级相位调制格式具有更窄的频谱宽度、更高的频谱效率,解调后的眼图也很好,有望成为下一代光纤通信系统的首选传输码型。
张霞 +6 more
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