Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosit...Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosity & density sensor,polymerase chain reaction(PCR) chip and integrated sensor etc.This paper introduces the technologies and research results related to MEMS sensors we achieved in the last 20 years.展开更多
In this paper, the ADS-B （automatic dependent surveillance-broadcast） used for manned aircrafts is chosen for aSee-and-Avoid sensor of UAV （unmanned aerial vehicle）, then GDL90 type is selected among three type...In this paper, the ADS-B （automatic dependent surveillance-broadcast） used for manned aircrafts is chosen for aSee-and-Avoid sensor of UAV （unmanned aerial vehicle）, then GDL90 type is selected among three types of ADS-B. The serialcommunication data protocol which communicates between GDL90 and control panel of GDL90 is analyzed and tailored for theinterface of the GDL90 simulator here. This ADS-B （GDL90） simulator sends intruder information to FCC （flight control computer）of UAV for collision avoidance function.展开更多
To determine the refractive index of liquids in near infrared（lR）, a method is presented by measuring the output angle of the visible Cerenkov-radiation-mode when liquids are placed as the cover on a planar lithium ...To determine the refractive index of liquids in near infrared（lR）, a method is presented by measuring the output angle of the visible Cerenkov-radiation-mode when liquids are placed as the cover on a planar lithium niobate waveguide. The system configuration and the principle of the method are analyzed and some experimental results are given out. Both the experimental result and simulation show that this method is simple, rapid and of sufficient precision.展开更多
The shaft-less impeller of the centrifugal pump, which is driven by the magnetic induction, was developed. Theimpeller rotates under the floating condition without any control device. The floating condition of the imp...The shaft-less impeller of the centrifugal pump, which is driven by the magnetic induction, was developed. Theimpeller rotates under the floating condition without any control device. The floating condition of the impeller isrealized by utilizing the pressure in pump casing. The pump performance and the rotational behavior of the impellerwere investigated experimentally. It has found that the floating position of the impeller become quite unstablein a partial flow rate operation. And the pressure distribution at the casing wall affects the rotational posture ofthe impeller. This paper presents the effect of the casing treatment on the rotational posture of the impeller and thepressure distribution. The reasonable casing treatment is available for the stable rotational posture of the impeller.展开更多
Recently, many programs have been developed for simulation or analysis of the different parameters of light propagation in optical fibers, either for sensing or for communication purposes. In this paper, it is shown t...Recently, many programs have been developed for simulation or analysis of the different parameters of light propagation in optical fibers, either for sensing or for communication purposes. In this paper, it is shown the COMSOL Multiphysics as a fairly robust and simple program, due to the existence of a graphical environment, to perform simulations with good accuracy. Results are compared with other simulation analysis, focusing on the surface plasmon resonance （SPR） phenomena for refractive index sensing in a D-type optical fiber, where the characteristics of the material layers, in terms of the type and thickness, and the residual fiber cladding thickness are optimized.展开更多
Pressure-sensitive paint(PSP)is a global pressure measurement technique.Compared with pressure transducers,PSP has significant advantages such as high spatial resolution and a lack of contact when applied to fast-rota...Pressure-sensitive paint(PSP)is a global pressure measurement technique.Compared with pressure transducers,PSP has significant advantages such as high spatial resolution and a lack of contact when applied to fast-rotating blades.However,due to the limitations of other pressure measurement techniques,the validation of PSP measurements on fast-rotating blades is generally difficult.In this work,a comprehensive study including PSP measurement,force balance measurement,and simulation was conducted on a 1 m-diameter propeller at the China Aerodynamic Research and Development Center.First,our computational fluid dynamics(CFD)code was validated by comparing the calculated aerodynamic thrust with the results from force balance measurements.Then,the pressure distributions on the propeller blade obtained by PSP were carefully compared with the CFD results under different working conditions.The results of PSP measurements,force balance measurements,and CFD showed good agreement,and the PSP measurement errors were estimated to be less than 5% of the dynamic pressure at the blade tip.Finally,the variations in pressure distribution under different rotating speeds and free-stream velocities were discussed.展开更多
Background Approximately 10%of patients with gastric cancer(GC)have a genetic predisposition toward the disease.However,there is scant knowledge regarding germline mutations in predisposing genes in the Chinese GC pop...Background Approximately 10%of patients with gastric cancer(GC)have a genetic predisposition toward the disease.However,there is scant knowledge regarding germline mutations in predisposing genes in the Chinese GC population.This study aimed to determine the spectrum and distribution of predisposing gene mutations among Chinese GC patients known to have hereditary high-risk factors for cancer.Methods A total of 40 GC patients from 40 families were recruited from seven medical institutions in China.Next-generation sequencing was performed on 171 genes associated with cancer predisposition.For probands carrying pathogenic/likely pathogenic germline variants,Sanger sequencing was applied to validate the variants in the probands as well as their relatives.Results According to sequencing results,25.0%(10/40)of the patients carried a combined total of 10 pathogenic or likely pathogenic germline variants involving nine different genes:CDH1(n=1),MLH1(n=1),MSH2(n=1),CHEK2(n=1),BLM(n=1),EXT2(n=1),PALB2(n=1),ERCC2(n=1),and SPINK1(n=2).In addition,129 variants of uncertain significance were identified in 27 patients.Conclusions This study indicates that approximately one in every four Chinese GC patients with hereditary high risk factors may harbor pathogenic/likely pathogenic germline alterations in cancer-susceptibility genes.The results further indicate a unique genetic background for GC among Chinese patients.展开更多
Fiber optic sensors have a set of properties that make them very attractive in biomechanics. However, they remain unknown to many who work in the field. Some possible causes are scarce information, few research groups...Fiber optic sensors have a set of properties that make them very attractive in biomechanics. However, they remain unknown to many who work in the field. Some possible causes are scarce information, few research groups using them in a routine basis, and even fewer companies offering turnkey and affordable solutions. Nevertheless, as optical fibers revolutionize the way of carrying data in telecommunications, a similar trend is detectable in the world of sensing. The present review aims to describe the most relevant contributions of fiber sensing in biomechanics since their introduction, from 1960s to the present, focusing on intensity-based configurations. An effort has been made to identify key researchers, research and development （R＆D） groups and main applications.展开更多
Tuina is a physical therapy for treatment and prevention of diseases. The predecessors had summed up the systematic tuina manipulations through experiences. In order to study the scientificity and usability of the tec...Tuina is a physical therapy for treatment and prevention of diseases. The predecessors had summed up the systematic tuina manipulations through experiences. In order to study the scientificity and usability of the technology, the researchers established a mathematical model of tuina man ipulati ons, and used video tech no logy to capture the trajectory of the manipulations. Using the mechanical sensor to sense the real manipulations, researchers developed a tuina manipulation in strument and obtained a lot of basic mecha nics data about the man ipulati on tech no logy. Through the summary of the research results of the predecessors, accurate, true and comprehe nsive mecha nical parameters of tech no logy of tuina manipulations were obtained to guide the research and development of instruments of tuina manipulations, and promote the development of the discipline of tuina scienee.展开更多
文摘Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosity & density sensor,polymerase chain reaction(PCR) chip and integrated sensor etc.This paper introduces the technologies and research results related to MEMS sensors we achieved in the last 20 years.
文摘In this paper, the ADS-B （automatic dependent surveillance-broadcast） used for manned aircrafts is chosen for aSee-and-Avoid sensor of UAV （unmanned aerial vehicle）, then GDL90 type is selected among three types of ADS-B. The serialcommunication data protocol which communicates between GDL90 and control panel of GDL90 is analyzed and tailored for theinterface of the GDL90 simulator here. This ADS-B （GDL90） simulator sends intruder information to FCC （flight control computer）of UAV for collision avoidance function.
文摘To determine the refractive index of liquids in near infrared（lR）, a method is presented by measuring the output angle of the visible Cerenkov-radiation-mode when liquids are placed as the cover on a planar lithium niobate waveguide. The system configuration and the principle of the method are analyzed and some experimental results are given out. Both the experimental result and simulation show that this method is simple, rapid and of sufficient precision.
文摘The shaft-less impeller of the centrifugal pump, which is driven by the magnetic induction, was developed. Theimpeller rotates under the floating condition without any control device. The floating condition of the impeller isrealized by utilizing the pressure in pump casing. The pump performance and the rotational behavior of the impellerwere investigated experimentally. It has found that the floating position of the impeller become quite unstablein a partial flow rate operation. And the pressure distribution at the casing wall affects the rotational posture ofthe impeller. This paper presents the effect of the casing treatment on the rotational posture of the impeller and thepressure distribution. The reasonable casing treatment is available for the stable rotational posture of the impeller.
文摘Recently, many programs have been developed for simulation or analysis of the different parameters of light propagation in optical fibers, either for sensing or for communication purposes. In this paper, it is shown the COMSOL Multiphysics as a fairly robust and simple program, due to the existence of a graphical environment, to perform simulations with good accuracy. Results are compared with other simulation analysis, focusing on the surface plasmon resonance （SPR） phenomena for refractive index sensing in a D-type optical fiber, where the characteristics of the material layers, in terms of the type and thickness, and the residual fiber cladding thickness are optimized.
基金supported by the Foundation of the State Key Laboratory of Aerodynamics(Grant No.SKLA2019040302)the National Natural Science Foundation of China(Grant No.11872038).
文摘Pressure-sensitive paint(PSP)is a global pressure measurement technique.Compared with pressure transducers,PSP has significant advantages such as high spatial resolution and a lack of contact when applied to fast-rotating blades.However,due to the limitations of other pressure measurement techniques,the validation of PSP measurements on fast-rotating blades is generally difficult.In this work,a comprehensive study including PSP measurement,force balance measurement,and simulation was conducted on a 1 m-diameter propeller at the China Aerodynamic Research and Development Center.First,our computational fluid dynamics(CFD)code was validated by comparing the calculated aerodynamic thrust with the results from force balance measurements.Then,the pressure distributions on the propeller blade obtained by PSP were carefully compared with the CFD results under different working conditions.The results of PSP measurements,force balance measurements,and CFD showed good agreement,and the PSP measurement errors were estimated to be less than 5% of the dynamic pressure at the blade tip.Finally,the variations in pressure distribution under different rotating speeds and free-stream velocities were discussed.
文摘Background Approximately 10%of patients with gastric cancer(GC)have a genetic predisposition toward the disease.However,there is scant knowledge regarding germline mutations in predisposing genes in the Chinese GC population.This study aimed to determine the spectrum and distribution of predisposing gene mutations among Chinese GC patients known to have hereditary high-risk factors for cancer.Methods A total of 40 GC patients from 40 families were recruited from seven medical institutions in China.Next-generation sequencing was performed on 171 genes associated with cancer predisposition.For probands carrying pathogenic/likely pathogenic germline variants,Sanger sequencing was applied to validate the variants in the probands as well as their relatives.Results According to sequencing results,25.0%(10/40)of the patients carried a combined total of 10 pathogenic or likely pathogenic germline variants involving nine different genes:CDH1(n=1),MLH1(n=1),MSH2(n=1),CHEK2(n=1),BLM(n=1),EXT2(n=1),PALB2(n=1),ERCC2(n=1),and SPINK1(n=2).In addition,129 variants of uncertain significance were identified in 27 patients.Conclusions This study indicates that approximately one in every four Chinese GC patients with hereditary high risk factors may harbor pathogenic/likely pathogenic germline alterations in cancer-susceptibility genes.The results further indicate a unique genetic background for GC among Chinese patients.
文摘Fiber optic sensors have a set of properties that make them very attractive in biomechanics. However, they remain unknown to many who work in the field. Some possible causes are scarce information, few research groups using them in a routine basis, and even fewer companies offering turnkey and affordable solutions. Nevertheless, as optical fibers revolutionize the way of carrying data in telecommunications, a similar trend is detectable in the world of sensing. The present review aims to describe the most relevant contributions of fiber sensing in biomechanics since their introduction, from 1960s to the present, focusing on intensity-based configurations. An effort has been made to identify key researchers, research and development （R＆D） groups and main applications.
文摘Tuina is a physical therapy for treatment and prevention of diseases. The predecessors had summed up the systematic tuina manipulations through experiences. In order to study the scientificity and usability of the technology, the researchers established a mathematical model of tuina man ipulati ons, and used video tech no logy to capture the trajectory of the manipulations. Using the mechanical sensor to sense the real manipulations, researchers developed a tuina manipulation in strument and obtained a lot of basic mecha nics data about the man ipulati on tech no logy. Through the summary of the research results of the predecessors, accurate, true and comprehe nsive mecha nical parameters of tech no logy of tuina manipulations were obtained to guide the research and development of instruments of tuina manipulations, and promote the development of the discipline of tuina scienee.
