Search results
4 hours ago · An easily stackable multi-layer quasi-zero-stiffness (ML-QZS) meta-structure is proposed to achieve highly efficient vibration isolation performance at low frequency. First, the distributed shape optimization method is used to design the unit cel, i.e., the single-layer QZS (SL-QZS) meta-structure. Second, the stiffness feature of the unit cell is investigated and verified through static experiments. Third, the unit cells are stacked one by one along the direction of vibration isolation, and ...
1 day ago · Fentanyl. Fentanyl is a highly potent synthetic piperidine opioid primarily used as an analgesic. It is 20 to 40 times more potent than heroin and 100 times more potent than morphine; [8] its primary clinical utility is in pain management for cancer patients and those recovering from painful surgeries. [9] [10] Fentanyl is also used as a ...
1 day ago · Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. [2] [7] These contrast with benign tumors, which do not spread. [7] Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss, and a change in bowel movements. [1]
1 day ago · Spark ML Pipeline 机器学习简单介绍. Spark 机器学习工作流程（ML Pipeline）的原理就是将机器学习的每一个阶段形成机器学习工作流程。. 流程示意图如下。. （跟sklearn的pipeline相似）. 说明如下：. （1）建立机器学习流程pipeline：包含4个阶段（stages），前三个阶段是 ...
