通过对行波及声流产生机理的研究,得出微管中的流体产生与行波同方向的声流。利用FPW(flexura lp late w ave)装置进行了跟踪、染色试验,验证了超声行波对微流体驱动的可行性。作为一种新型微流体驱动技术,行波微流体驱动能很好的弥补...通过对行波及声流产生机理的研究,得出微管中的流体产生与行波同方向的声流。利用FPW(flexura lp late w ave)装置进行了跟踪、染色试验,验证了超声行波对微流体驱动的可行性。作为一种新型微流体驱动技术,行波微流体驱动能很好的弥补现有驱动和控制技术的不足。展开更多
A new method for solid-liquid separation in micro-fluidic system is proposed on the basis of digital micro-fluid technology.The motion of solid particles in the micro-fluidic channel of micron scale is controlled from...A new method for solid-liquid separation in micro-fluidic system is proposed on the basis of digital micro-fluid technology.The motion of solid particles in the micro-fluidic channel of micron scale is controlled from the outside of the micro-fluidic system by means of inertial force field produced from the piezoelectric ceramic actuators.Solid-liquid separation is realized due to the velocity difference between micro-fluid and solid particles in the micro-fluidic channel.The separation and selection of solid particles with different density is brought to effect as a result of velocity difference between solid particles in the micro-fluidic channels.It is proved that inertial force still plays a leading role in solid-liquid separation of micron scale.As solid particles usually stick to the surface of the micro-fluidic channels,which leads to difficulty in solid-liquid separation,it is essential to eliminate or weaken the influence of surface force with the aid of surface hydrophobization to the micro-fluidic channels.This method is adopted to drive and separate all kinds of solid particles such as inorganic particles,organic particles and particles with biological activity in the micro-fluidic system,and is especially fit to separate solid particles from high concentration suspension in the micro-fluidic channels which are difficult to separate in other ways.展开更多
Micro-scale functionally graded material(FGM)pipes conveying fluid have many significant applications in engineering fields.In this work,the thermoelastic vibration of FGM fluid-conveying tubes in elastic medium is st...Micro-scale functionally graded material(FGM)pipes conveying fluid have many significant applications in engineering fields.In this work,the thermoelastic vibration of FGM fluid-conveying tubes in elastic medium is studied.Based on modified couple stress theory and Hamilton’s principle,the governing equation and boundary conditions are obtained.The differential quadrature method(DQM)is applied to investigating the thermoelastic vibration of the FGM pipes.The effect of temperature variation,scale effect of the microtubule,micro-fluid effect,material properties,elastic coefficient of elastic medium and outer radius on thermoelastic vibration of the FGM pipes conveying fluid are studied.The results show that in the condition of considering the scale effect and micro-fluid of the microtubule,the critical dimensionless velocity of the system is higher than that of the system which calculated using classical macroscopic model.The results also show that the variations of temperature,material properties,elastic coefficient and outer radius have significant influences on the first-order dimensionless natural frequency.展开更多
Objective: To detect the expression of CEA mRNA in patients with non-small cell lung cancer (NSCLC) and to investigate it's significance. Methods: The blood samples were taken from peripheral veins of 70 patients ...Objective: To detect the expression of CEA mRNA in patients with non-small cell lung cancer (NSCLC) and to investigate it's significance. Methods: The blood samples were taken from peripheral veins of 70 patients with NSCLC and 18 patients with benign diseases at 3 intervals during the surgery. The transcription of carcinoembryonic antigen messenger ribonucleic acid (CEA mRNA) was assayed by means of nested reverse transcriptase polymerase chain reaction (RT-PCR) and micro-fluid chip. Results: The CEA mRNA positive rates at each of the 3 time spots were as follows: 50% at beginning of the surgery (group 1), 62.8% in the samples collected when ligating the pulmonary vein (group 2) and 57.1% in samples collected 1 h after ligation (group 3). A significant difference was found between groups 1 and 2 (χ2 = 7.114, P < 0.05). Con-clusion: Cancer cell dissemination during surgery is demonstrated indirectly in our study, when to ligate the pulmonary vein (earlier or later) may affect the quantity of tumor cells spread into the circulation.展开更多
文摘A new method for solid-liquid separation in micro-fluidic system is proposed on the basis of digital micro-fluid technology.The motion of solid particles in the micro-fluidic channel of micron scale is controlled from the outside of the micro-fluidic system by means of inertial force field produced from the piezoelectric ceramic actuators.Solid-liquid separation is realized due to the velocity difference between micro-fluid and solid particles in the micro-fluidic channel.The separation and selection of solid particles with different density is brought to effect as a result of velocity difference between solid particles in the micro-fluidic channels.It is proved that inertial force still plays a leading role in solid-liquid separation of micron scale.As solid particles usually stick to the surface of the micro-fluidic channels,which leads to difficulty in solid-liquid separation,it is essential to eliminate or weaken the influence of surface force with the aid of surface hydrophobization to the micro-fluidic channels.This method is adopted to drive and separate all kinds of solid particles such as inorganic particles,organic particles and particles with biological activity in the micro-fluidic system,and is especially fit to separate solid particles from high concentration suspension in the micro-fluidic channels which are difficult to separate in other ways.
文摘Micro-scale functionally graded material(FGM)pipes conveying fluid have many significant applications in engineering fields.In this work,the thermoelastic vibration of FGM fluid-conveying tubes in elastic medium is studied.Based on modified couple stress theory and Hamilton’s principle,the governing equation and boundary conditions are obtained.The differential quadrature method(DQM)is applied to investigating the thermoelastic vibration of the FGM pipes.The effect of temperature variation,scale effect of the microtubule,micro-fluid effect,material properties,elastic coefficient of elastic medium and outer radius on thermoelastic vibration of the FGM pipes conveying fluid are studied.The results show that in the condition of considering the scale effect and micro-fluid of the microtubule,the critical dimensionless velocity of the system is higher than that of the system which calculated using classical macroscopic model.The results also show that the variations of temperature,material properties,elastic coefficient and outer radius have significant influences on the first-order dimensionless natural frequency.
基金the Natural Sciences Foundation of Anhui Province (No. 2002kj220)
文摘Objective: To detect the expression of CEA mRNA in patients with non-small cell lung cancer (NSCLC) and to investigate it's significance. Methods: The blood samples were taken from peripheral veins of 70 patients with NSCLC and 18 patients with benign diseases at 3 intervals during the surgery. The transcription of carcinoembryonic antigen messenger ribonucleic acid (CEA mRNA) was assayed by means of nested reverse transcriptase polymerase chain reaction (RT-PCR) and micro-fluid chip. Results: The CEA mRNA positive rates at each of the 3 time spots were as follows: 50% at beginning of the surgery (group 1), 62.8% in the samples collected when ligating the pulmonary vein (group 2) and 57.1% in samples collected 1 h after ligation (group 3). A significant difference was found between groups 1 and 2 (χ2 = 7.114, P < 0.05). Con-clusion: Cancer cell dissemination during surgery is demonstrated indirectly in our study, when to ligate the pulmonary vein (earlier or later) may affect the quantity of tumor cells spread into the circulation.
