Results 1 to 10 of about 3,685 (215)
[Research Progress on Microbiome-Driven Mechanisms and Intervention Strategies for Oral Malodor]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue Ban口腔异味作为一种常见的口腔症状，其核心驱动机制是口腔微生物的代谢活动。特征性气味主要来源于口腔菌群（如具核梭杆菌、牙龈卟啉单胞菌等）通过特异性酶系分解唾液、龈沟液及食物残渣中的含硫氨基酸，产生并释放的挥发性硫化物。研究表明，牙周炎、真菌感染、吸烟、肥胖等多种因素可通过改变口腔微生态环境而加剧异味问题。在防治策略方面，植物提取物、抗菌肽、益生菌等新型干预手段通过特异性抑制致病菌、破坏生物膜结构及调节口腔菌群平衡，展现出较传统抗菌药物更优的微生态安全性。本文综述相关研究进展 ...
Shang X, Wang Z, Ge S.
europepmc +2 more sources
Multi-Functional Spatiotemporal Evolution of Cultivated Land and Its Driving Mechanisms in Poyang Lake Plain [PDF]
, 2023 [Objective] The spatial and temporal evolution patterns and driving mechanisms of multifunctional cropland were analyzed in order to provide support for ensuring food security and promoting the coordinated development of regional multifunctional cropland
Cai Haisheng +4 more
core +1 more source
Dynamic evolution and driving mechanism of global photovoltaic module trade network [PDF]
, 2023 [Objective] Under the background of energy crisis, countries (regions) around the world have accelerated the distribution of photovoltaic (PV) renewable energy, so it is important to explore the dynamic evolution characteristics and driving mechanism of ...
CHENG Yunjie, LIU Xu
core +1 more source
Effects of Human Activities on Terrestrial Vegetation Coverage Change of Poyang Lake Basin During 2000—2020 [PDF]
, 2022 [Objective] The mechanism on how human activities affect vegetation dynamics was studied in order to promote the healthy development of terrestrial ecosystems.
Liu Jia +4 more
core +1 more source
Research on Land Use Simulation and Optimization Regulation in Nanchang City Based on Low-carbon Orientation [PDF]
, 2023 [Objective] The changes in land use under different low-carbon scenarios were simulated, and the differences in carbon storage and carbon emissions under multiple scenarios were compared in order to provide relevant suggestions for the low-carbon ...
Chen Jiacheng, Luo Yuan, Luo Zhijun
core +1 more source
Gaoya dianqi, 2022 为提高真空断路器分合闸性能和智能化操作水平，提出了适用于真空断路器电机操动机构的RBF-PID控制方法，结合有限转角永磁无刷直流驱动电机动态数学模型，分析了驱动电机转速响应特性和运动过程可控性，构建了电机操动机构神经网络控制方程，对PID控制参数进行优化整定，分别计算分析常规PID和RBF-PID控制方法作用下真空断路器操作速度的跟踪特性。研制了电机操动机构速度控制系统，开展了真空断路器电机操动机构速度跟踪特性实验，结果表明，采用RBF-PID控制方法可以有效降低速度跟踪误差 ...
史可鉴 +5 more
doaj
Shuitu Baochi Xuebao, 2023 植被恢复是影响土壤有机碳库动态变化的关键过程之一,阐明植被恢复过程中土壤有机碳的固持动态及其驱动机制,是全球变化下碳循环研究的热点和前沿问题。本文综述了近年来国内外关于植被恢复过程中土壤有机碳固定动态及其驱动机制方面的研究,剖析植被恢复中土壤有机碳固持动态及其影响因素,探讨植物碳输入对土壤有机碳动态变化的影响机制,揭示植被恢复中土壤有机碳固定的物理、化学和微生物驱动机制,并对目前研究中存在的问题进行总结,进而提出关于植被恢复的土壤固碳效应研究,亟需在土壤有机碳组分的动态、微生物结构和功能,以及植物—土壤—
邓蕾 +3 more
doaj
Gaoya dianqi, 2020 为了抑制断路器合闸操作过程中的触头过冲与反弹现象,改善电机操动机构输出特性,文中通过分析电机操动机构断路器触头合闸运动过程,计算得到断路器动触头行程与驱动电机负载转矩之间数学关系,利用分段控制策略对电机操动机构驱动电机输出转矩进行调节,实现触头过冲与反弹的有效抑制。研制以数字信号处理器（DSP）为核心的控制装置,开展126 kV真空断路器电机操动机构合闸操作实验,对实验过程中的触头行程多组数据进行对比分析。结果表明:驱动电机在转动0°～10°,10°～36°,36°～64°角度时分别采用调制占空比1,0.
李少华 +6 more
doaj
, 2017 由于社交媒体的出现,社交互动发生了巨大变化。越来越多的组织使用社交媒体,但理论界对此却关注不足,国内相关研究尤为匮乏。社交媒体被概念化为一种基于互联网的允许用户从用户生成的内容获得价值,能够与他人进行交互,实时地或异步地实现机会性交互和选择性自我呈现的渠道。在系统梳理社交媒体的内涵、相关变量研究、进入的途径与特征、面临的机遇与风险以及使用的对策建议五个方面内容的基础上,本文通过评述已有的社交媒体相关研究,据此构建了工作场所中社交媒体研究的理论框架。该框架关注社交媒体的驱动机制、过程机制和效应机制三个环节,
张向前, 李昳
core +1 more source
Factors Influencing Recessive Transformation of Land Use in Fujian Province During 2000—2020 [PDF]
, 2023 [Objective] The spatio-temporal characteristics of the dominant driving forces and influencing factors of county land use transition in Fujian Province were analyzed, and a logical analysis framework of influencing factors of land use transition was ...
Chen Songlin, Du Fengyi, Pu Jiahao
core +1 more source