北极地区战略地位的提高促进了极区各种应用的快速发展,冰下水声通信成为其中一个热点问题。为了研究冰下单载波水声通信性能,在黄海冰区开展冰下试验。重点分析了内嵌锁相环的多通道判决反馈均衡(Multi-channel Decision Feedback Equa...北极地区战略地位的提高促进了极区各种应用的快速发展,冰下水声通信成为其中一个热点问题。为了研究冰下单载波水声通信性能,在黄海冰区开展冰下试验。重点分析了内嵌锁相环的多通道判决反馈均衡(Multi-channel Decision Feedback Equalization,M-DFE)技术在冰下水声通信中抗多途时延的能力,研究比较了改进比例归一化最小均方(Improved Proportional normalized Least Mean Square,IPNLMS)算法和递归最小二乘(Recursive Least Squares,RLS)算法的均衡性能。试验结果表明IPNLMS和RLS都能克服信道多途效应带来的影响。在牺牲计算复杂度的前提下,RLS具有更好的均衡效果,M-DFE在冰下环境中能够有效消除码间干扰。展开更多
The new curriculum standard requires high school physics teaching to adhere to a more open teaching concept, adhere to the physics teaching to highlight the experimental ability, awaken students' thinking with pro...The new curriculum standard requires high school physics teaching to adhere to a more open teaching concept, adhere to the physics teaching to highlight the experimental ability, awaken students' thinking with problems, and cultivate students' ability to ask, explore and solve problems. Therefore, the problem is not only a clue that runs through physics teaching, but also a starting point to explore new knowledge. Problem-based teaching is an effective way to cultivate students' scientific thinking and scientific methods. High school physics teachers should use the problem chain as a guide in teaching practice, according to students' cognitive status, to stimulate students' interest in learning and exploring science, so as to more efficiently promote the development of students' core quality in physics.展开更多
In the medical field, CT machines have a wide range of applications. When the CT machine was first developed, it could effectively diagnose the potential lesions of the human brain. With the gradual deepening of the r...In the medical field, CT machines have a wide range of applications. When the CT machine was first developed, it could effectively diagnose the potential lesions of the human brain. With the gradual deepening of the research on the CT machine, it can provide more diverse services for medical diagnosis and can be applied to the various vital organs of the human body. checking. At present, CT machines have become a necessary equipment in hospitals, and many hospitals have carried out the configuration of many different types of CT machines, so as to meet the corresponding needs of various medical diagnosis. However, in order to ensure that the CT machine can fully play a role in disease diagnosis and treatment, it is necessary to do a good job in the later repair and maintenance work. Based on this, this paper firstly introduces the structural composition and development of CT machine, studies the related measures of CT machines later maintenance, and analyzes the later maintenance and maintenance measures of CT machine through examples for reference.展开更多
文摘北极地区战略地位的提高促进了极区各种应用的快速发展,冰下水声通信成为其中一个热点问题。为了研究冰下单载波水声通信性能,在黄海冰区开展冰下试验。重点分析了内嵌锁相环的多通道判决反馈均衡(Multi-channel Decision Feedback Equalization,M-DFE)技术在冰下水声通信中抗多途时延的能力,研究比较了改进比例归一化最小均方(Improved Proportional normalized Least Mean Square,IPNLMS)算法和递归最小二乘(Recursive Least Squares,RLS)算法的均衡性能。试验结果表明IPNLMS和RLS都能克服信道多途效应带来的影响。在牺牲计算复杂度的前提下,RLS具有更好的均衡效果,M-DFE在冰下环境中能够有效消除码间干扰。
文摘The new curriculum standard requires high school physics teaching to adhere to a more open teaching concept, adhere to the physics teaching to highlight the experimental ability, awaken students' thinking with problems, and cultivate students' ability to ask, explore and solve problems. Therefore, the problem is not only a clue that runs through physics teaching, but also a starting point to explore new knowledge. Problem-based teaching is an effective way to cultivate students' scientific thinking and scientific methods. High school physics teachers should use the problem chain as a guide in teaching practice, according to students' cognitive status, to stimulate students' interest in learning and exploring science, so as to more efficiently promote the development of students' core quality in physics.
文摘In the medical field, CT machines have a wide range of applications. When the CT machine was first developed, it could effectively diagnose the potential lesions of the human brain. With the gradual deepening of the research on the CT machine, it can provide more diverse services for medical diagnosis and can be applied to the various vital organs of the human body. checking. At present, CT machines have become a necessary equipment in hospitals, and many hospitals have carried out the configuration of many different types of CT machines, so as to meet the corresponding needs of various medical diagnosis. However, in order to ensure that the CT machine can fully play a role in disease diagnosis and treatment, it is necessary to do a good job in the later repair and maintenance work. Based on this, this paper firstly introduces the structural composition and development of CT machine, studies the related measures of CT machines later maintenance, and analyzes the later maintenance and maintenance measures of CT machine through examples for reference.
