Results 91 to 100 of about 645 (141)
Gaoya dianqi针对电磁斥力操动机构的机械故障诊断率偏低问题，文中提出了一种基于改进蜣螂优化算法(IDBO)优化门控循环单元神经网络（GRU）的故障诊断方法。首先，采用最大奇异值能量熵方法(EEMSE)对机构的分闸振动信号进行特征提取构建特征向量矩阵，并利用Lasso回归系数和皮尔逊相关系数对特征矩阵进行降维。然后，引入Chebyshev混沌映射、黄金正弦策略、位置更新动态权重系数对传统蜣螂优化算法(DBO)进行改进，并使用IDBO对GRU超参数优化，建立基于IDBO-GRU的电磁斥力操动机构故障诊断模型。最后 ...
丁璨, 刘佳宇, 付博民, 贾振威
doaj
[Interpretation of the 2023 International Society for Burn Injuries "Surviving Sepsis After Burn Campaign"]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za ZhiZhu W, Peng YZ, Luo GX, Yuan ZQ.
europepmc +1 more source
基于VMD和KFCM-SVM的高压断路器声振联合故障诊断方法
Gaoya dianqi针对高压断路器机械故障复杂、故障特征提取困难的问题，提出一种变分模态分解（variational mode decomposition，VMD）与KFCM-SVM相结合的高压断路器声振联合故障诊断方法。首先利用VMD对去噪后的振动和声音信号进行分解，得到一系列反映断路器操动过程机械状态信息的本征模态函数（IMF）；然后对各IMF分量进行Hilbert变换，构造相应的Hilbert边际谱，求取能量熵作为特征向量；最后采用模糊核C—均值聚类（kernel fuzzy C means，KFCM ...
马莉 +6 more
doaj
[Toe-to-hand transplantation for thumb and finger reconstruction]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiZheng X.
europepmc +1 more source
Gaoya dianqi作为非电量检测手段，振动和噪声检测在电力设备故障诊断中因抗干扰能力强、准确度高等优点受到广泛关注。文中将振动和噪声检测技术联合引入气体绝缘金属输电管道GIL设备的机械故障检测与定位工作中，首先结合振动信号构建了一种GIL机械故障诊断模型，通过对试点GIL的上百组振动信号数据进行采集和时频域分析，然后采用海鸥优化算法（SOA）对传统向量机（SVM）进行了改进，构建了SOA-SVM训练数据集并取得了较好的效果，验证了该模型的有效性，最后结合噪声信号进行了GIL机械故障的定位研究 ...
徐爱华 +6 more
doaj
[Preliminary application of domestic single-port serpentine arm robotic surgical system in children's pyeloplasty]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanLi Z +6 more
europepmc +1 more source
[Construction of the evaluation index system for nursing quality management in outpatient dental clinics based on the structure-process-outcome model]. [PDF]
Hua Xi Kou Qiang Yi Xue Za ZhiWei J +7 more
europepmc +1 more source
Gaoya dianqi为进一步提高有载分接开关（on-load tap changer，OLTC）机械状态监测的准确性，文中基于优化品质因数可调小波变换（tunable quality wavelet transform，TQWT）对OLTC切换过程中的振动信号进行了分析。即使用人工鱼群算法（artificial fish swarm algorithm，AFSA）基于分解余量与整体正交系数研究了TQWT的优化分解方法，计算得到了OLTC振动信号的多个子序列，构建了基于优化孪生支持向量机（twin support ...
余长厅 +4 more
doaj
[Preclinical Development Process and Prospects of Real-time Fluorescence Quantitative Polymerase Chain Reaction Detection Kits]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanWang C, Li S, Zhang S.
europepmc +1 more source
[State-of-the-art in peripheral nerve injury diagnosis and therapy]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiSun J, Chen L.
europepmc +1 more source