The oracle-bone inscriptions related to medical issues encompass disease names,causes,progression,and treatment methods,reflecting the Shang(商)people’s understanding of diseases.This study,employing interdisciplinar...The oracle-bone inscriptions related to medical issues encompass disease names,causes,progression,and treatment methods,reflecting the Shang(商)people’s understanding of diseases.This study,employing interdisciplinary perspectives from philology and traditional Chinese medicine(TCM),explores the Shang dynasty’s understanding of disease etiology and its manifestations in TCM.The Shang people’s understanding of disease causation can be summarized as spiritual disturbances and harm from insects or curses.Spiritual disturbances are categorized into three aspects:diseases sent by the Shang Di(上帝Supreme Deity),diseases caused by deceased persons who had transformed into deities,and diseases associated with nightmares.Concepts in TCM,such as diseases caused by emotions,environmental pathogens,and the relationship between nightmares and diseases,can be traced back to early understanding of disease causation reflected in oracle-bone divinations.Furthermore,specific TCM treatments,such as Gui Men Shi San Zhen(鬼门十三针Thirteen Ghost Points)and Zhu You Shu(祝由术Zhuyou therapy),are deeply influenced by the concept of spiritual disturbances.The Shang people’s understanding of disease causation has profoundly impacted the formation and development of etiological theory in TCM,evident not only in theoretical explanations of disease causes but also in specific medical practices.By studying the concepts of disease causation in medical-related oracle-bone inscriptions,we can gain a deeper understanding of the development of ideas,theoretical systems,and treatment methods related to disease causes in TCM.展开更多
研究了船舶螺旋桨噪声和轴系噪声的噪声包络调制检测(detection of envelope modulation on noise, DEMON)谱的轴频线谱相位特性,提出了一种新的船舶目标特征即船舶螺旋桨噪声与轴系噪声轴频线谱之间的相位差。通过对船舶辐射噪声中螺...研究了船舶螺旋桨噪声和轴系噪声的噪声包络调制检测(detection of envelope modulation on noise, DEMON)谱的轴频线谱相位特性,提出了一种新的船舶目标特征即船舶螺旋桨噪声与轴系噪声轴频线谱之间的相位差。通过对船舶辐射噪声中螺旋桨噪声和轴系噪声轴频线谱相位的分析,指出二者相位存在一个较稳定的相位差。通过建模和仿真验证了相位差提取的可行性,并据此提出一种船舶螺旋桨噪声与轴系噪声的轴频线谱相位差特征提取方法。利用文章提出的特征提取方法,对实验中获取的船舶辐射噪声数据进行相位差特征提取,研究了在不同航速和相同型号不同个体目标船舶两种条件下,相位差特征的稳定性和可分性。结果表明在一定的时间窗内,相位差特征在不同航速下具有较好的稳定性,在相同型号船舶间具有较好的可分性,可以为个体船舶目标识别提供参考。展开更多
文摘The oracle-bone inscriptions related to medical issues encompass disease names,causes,progression,and treatment methods,reflecting the Shang(商)people’s understanding of diseases.This study,employing interdisciplinary perspectives from philology and traditional Chinese medicine(TCM),explores the Shang dynasty’s understanding of disease etiology and its manifestations in TCM.The Shang people’s understanding of disease causation can be summarized as spiritual disturbances and harm from insects or curses.Spiritual disturbances are categorized into three aspects:diseases sent by the Shang Di(上帝Supreme Deity),diseases caused by deceased persons who had transformed into deities,and diseases associated with nightmares.Concepts in TCM,such as diseases caused by emotions,environmental pathogens,and the relationship between nightmares and diseases,can be traced back to early understanding of disease causation reflected in oracle-bone divinations.Furthermore,specific TCM treatments,such as Gui Men Shi San Zhen(鬼门十三针Thirteen Ghost Points)and Zhu You Shu(祝由术Zhuyou therapy),are deeply influenced by the concept of spiritual disturbances.The Shang people’s understanding of disease causation has profoundly impacted the formation and development of etiological theory in TCM,evident not only in theoretical explanations of disease causes but also in specific medical practices.By studying the concepts of disease causation in medical-related oracle-bone inscriptions,we can gain a deeper understanding of the development of ideas,theoretical systems,and treatment methods related to disease causes in TCM.
文摘研究了船舶螺旋桨噪声和轴系噪声的噪声包络调制检测(detection of envelope modulation on noise, DEMON)谱的轴频线谱相位特性,提出了一种新的船舶目标特征即船舶螺旋桨噪声与轴系噪声轴频线谱之间的相位差。通过对船舶辐射噪声中螺旋桨噪声和轴系噪声轴频线谱相位的分析,指出二者相位存在一个较稳定的相位差。通过建模和仿真验证了相位差提取的可行性,并据此提出一种船舶螺旋桨噪声与轴系噪声的轴频线谱相位差特征提取方法。利用文章提出的特征提取方法,对实验中获取的船舶辐射噪声数据进行相位差特征提取,研究了在不同航速和相同型号不同个体目标船舶两种条件下,相位差特征的稳定性和可分性。结果表明在一定的时间窗内,相位差特征在不同航速下具有较好的稳定性,在相同型号船舶间具有较好的可分性,可以为个体船舶目标识别提供参考。
文摘为了研究对转桨和单桨的目标特性差异,在大型空泡水筒中针对单桨和对转桨的非空泡和空泡工况进行了噪声测量试验,采集了单桨和对转桨在空化条件和非空化条件下的噪声信号。首先针对空泡水筒自身特性进行了分析研究,发现空泡水筒在1.8 kHz和3.8 kHz附近易产生混响干扰。其次,借助数字信号处理技术对测量的声信号进行谱分析,对比研究了单桨和对转桨在空化条件和非空化条件下噪声信号在频域上的差异和规律,并采用频闪仪和高速摄像机对桨叶空泡进行了观察。试验表明,在非空化条件下,相同工况时对转桨噪声级比单桨高6 d B以上,对转桨倍频程衰减值要小于单桨,对转桨和单桨的三分之一倍频程谱在1.8 kHz和3.8 kHz附近会出现峰值,单桨8 kHz附近峰值是由唱音引起;在空化条件下,相同工况时对转桨和单桨三分之一倍频程谱变化趋势基本一致,对转桨噪声级比单桨高3~20 d B。在空化和非空化条件下,对转桨的调制谱特征比单桨复杂,对转桨的调制频段要远大于单桨,对转桨前后桨一阶叶频组合的调制作用最强,而单桨一阶叶频调制作用最强。
