The air precooler of SABRE engine(Synergetic Air-Breathing Rocket Engine)is a tube bundle type of heat exchanger consisting of thousands of small tubes.The cold helium gas flows in the small tube bundle,and the high-s...The air precooler of SABRE engine(Synergetic Air-Breathing Rocket Engine)is a tube bundle type of heat exchanger consisting of thousands of small tubes.The cold helium gas flows in the small tube bundle,and the high-speed hot air circulates outside the tubes and exchanges heat with the helium in the tubes.In this study,the cross-arrangement tube bundle consisting of small tubes with outer diameter of 1mm was taken as the research object.The system simulation calculation and data sorting were carried out.It is found that the empirical correlation of the conventional tube bundle is no longer applicable to the small tube and the reasons for inapplicability are explained by analysis of flow field.In addition,the results show that the average heat transfer coefficient of cross small/micro tube bundle isn’t affected by heat flux,but increases with the increase of Reynolds number,increases with the increase of transverse spacing,and decreases with the increase of longitudinal spacing.The flow resistance coefficient isn’t affected by heat flux and longitudinal spacing,but decreases with the increase of Reynolds number,and decreases with the increase of transverse spacing.展开更多
Syphilitic periostitis is not a common manifestation of bone involvement in congenital and acquired late syphilis, and it’s rarely seen in secondary syphilis. Syphilis should be considered as a differential diagnosis...Syphilitic periostitis is not a common manifestation of bone involvement in congenital and acquired late syphilis, and it’s rarely seen in secondary syphilis. Syphilis should be considered as a differential diagnosis in patient with deep bony pain that worsens at night. We report a case of secondary syphilis presented with multiple bony swelling of both tibiae (sabre-like) and other long bones.展开更多
Jin yong’s martial arts novels have always been flourishing our literature world. Some critics even call his nar- rative system as Jin yong Narratology. In his novels, there are a large number of unforgettable charac...Jin yong’s martial arts novels have always been flourishing our literature world. Some critics even call his nar- rative system as Jin yong Narratology. In his novels, there are a large number of unforgettable characters especially female characters that are warmly received by readers. What’s more, his methods of characterization in his novels can be said to be classic and sole. And that is the reason that characters in his novels make deep impressions on readers. Thus, this thesis aims to analyze a special female character Zhou Zhiruo in The Heaven Sword and the Dragon Sabre from the aspects of character and characterization in Narrotology. Zhou Zhiruo is a round character seldom seen in Chinese novel. Through studying on image features and reasons of her image features, Jin yong’s martial arts novels’ charm has been greatly displayed. It is hoped that this thesis can provide some useful information for researchers or persons who take interest in Jin yong展开更多
Late-Onset Epilepsy (LOE), with onset in adult life, is often attributed to cerebrovascular disease and intracranial tumor. Herein we present a LOE patient with history of Linear Scleroderma en Coup de Sabre (LScs) an...Late-Onset Epilepsy (LOE), with onset in adult life, is often attributed to cerebrovascular disease and intracranial tumor. Herein we present a LOE patient with history of Linear Scleroderma en Coup de Sabre (LScs) and abnormal cranial MRI signs. Curiously, his band-like skin lesion, presenting on the forehead, was in line with the surface projection of the intracranial focus shown in MRI. This gave a clue of the link between the skin lesion and the intracranial focus and the epilepsy. To sum up, it exposed a rare cause of LOE. Moreover, it underlined the significance of recognizing the cause to be associated with a substantially increased risk of developing epilepsy.展开更多
In this paper, we are going to study the surface structure and existing symmetry by simulation of a quasicrystal Al-Pd- Mn. Quasicrystals have unique properties in their own structure. In the surface structure general...In this paper, we are going to study the surface structure and existing symmetry by simulation of a quasicrystal Al-Pd- Mn. Quasicrystals have unique properties in their own structure. In the surface structure generally we should pay attention to two subjects. Firstly, what kind of atoms have situated on the surface and secondly the form of collecting atoms by each other sides. Usually, there are different ways for answer to these questions. In this study, Low Energy Ion Scattering (LEIS) technique has been applied. We select a representative cell by using gained information from Low Energy Electron Diffraction (LEED) technique, and give the information to the SABRE computer program. This computer program has been run for azimuthally angles 0 - 180 degrees in the intervals of 9 degree and its output has been analyzed for gaining azimuthally scan. The azimuthally scan shows the existing of a symmetry 72 degree on the surface of this quasicrystal.展开更多
基金This work was supported by the National Key Research and Development Program of China(No.2018YFC0310400).
文摘The air precooler of SABRE engine(Synergetic Air-Breathing Rocket Engine)is a tube bundle type of heat exchanger consisting of thousands of small tubes.The cold helium gas flows in the small tube bundle,and the high-speed hot air circulates outside the tubes and exchanges heat with the helium in the tubes.In this study,the cross-arrangement tube bundle consisting of small tubes with outer diameter of 1mm was taken as the research object.The system simulation calculation and data sorting were carried out.It is found that the empirical correlation of the conventional tube bundle is no longer applicable to the small tube and the reasons for inapplicability are explained by analysis of flow field.In addition,the results show that the average heat transfer coefficient of cross small/micro tube bundle isn’t affected by heat flux,but increases with the increase of Reynolds number,increases with the increase of transverse spacing,and decreases with the increase of longitudinal spacing.The flow resistance coefficient isn’t affected by heat flux and longitudinal spacing,but decreases with the increase of Reynolds number,and decreases with the increase of transverse spacing.
文摘Syphilitic periostitis is not a common manifestation of bone involvement in congenital and acquired late syphilis, and it’s rarely seen in secondary syphilis. Syphilis should be considered as a differential diagnosis in patient with deep bony pain that worsens at night. We report a case of secondary syphilis presented with multiple bony swelling of both tibiae (sabre-like) and other long bones.
文摘Jin yong’s martial arts novels have always been flourishing our literature world. Some critics even call his nar- rative system as Jin yong Narratology. In his novels, there are a large number of unforgettable characters especially female characters that are warmly received by readers. What’s more, his methods of characterization in his novels can be said to be classic and sole. And that is the reason that characters in his novels make deep impressions on readers. Thus, this thesis aims to analyze a special female character Zhou Zhiruo in The Heaven Sword and the Dragon Sabre from the aspects of character and characterization in Narrotology. Zhou Zhiruo is a round character seldom seen in Chinese novel. Through studying on image features and reasons of her image features, Jin yong’s martial arts novels’ charm has been greatly displayed. It is hoped that this thesis can provide some useful information for researchers or persons who take interest in Jin yong
文摘Late-Onset Epilepsy (LOE), with onset in adult life, is often attributed to cerebrovascular disease and intracranial tumor. Herein we present a LOE patient with history of Linear Scleroderma en Coup de Sabre (LScs) and abnormal cranial MRI signs. Curiously, his band-like skin lesion, presenting on the forehead, was in line with the surface projection of the intracranial focus shown in MRI. This gave a clue of the link between the skin lesion and the intracranial focus and the epilepsy. To sum up, it exposed a rare cause of LOE. Moreover, it underlined the significance of recognizing the cause to be associated with a substantially increased risk of developing epilepsy.
文摘In this paper, we are going to study the surface structure and existing symmetry by simulation of a quasicrystal Al-Pd- Mn. Quasicrystals have unique properties in their own structure. In the surface structure generally we should pay attention to two subjects. Firstly, what kind of atoms have situated on the surface and secondly the form of collecting atoms by each other sides. Usually, there are different ways for answer to these questions. In this study, Low Energy Ion Scattering (LEIS) technique has been applied. We select a representative cell by using gained information from Low Energy Electron Diffraction (LEED) technique, and give the information to the SABRE computer program. This computer program has been run for azimuthally angles 0 - 180 degrees in the intervals of 9 degree and its output has been analyzed for gaining azimuthally scan. The azimuthally scan shows the existing of a symmetry 72 degree on the surface of this quasicrystal.
