Field emission properties of carbon nanotube cold cathode （CNT-CC） of triode- and diode-structure have been investigated by using the finite element method of numerical simulation. Specially, the effects of gate vol...Field emission properties of carbon nanotube cold cathode （CNT-CC） of triode- and diode-structure have been investigated by using the finite element method of numerical simulation. Specially, the effects of gate voltage and hole radius R on the emission properties have been analyzed based on the finite element method. Results indicate that the gate can make the excitation electric field E increase, turn-on voltage decrease, and the emission current density J rise. The result shows that the E reaches its maximum value at the top of carbon nanotube （CNT）, and the optimum field emission performance can be obtained when R is equal to 10 times the diameter of the carbon nanotube.展开更多
To the Editor:The differentiation of multiple primary lung adenocarcinomas (MPLAs) from metastases is important to allow for proper clinical management and prognostic prediction.The current revised diagnostic criteria...To the Editor:The differentiation of multiple primary lung adenocarcinomas (MPLAs) from metastases is important to allow for proper clinical management and prognostic prediction.The current revised diagnostic criteria for MPLAs proposed by the American College of Chest Physicians (ACCP) have been commonly applied since 2003.[1] However, it remains technically challenging to determine whether 2 or more lung adenocarcinomas from the same patient are homologous.Various approaches and algorithms including gene mutation analysis addressing this problem have been described.[2,3] Here, we present a cohort of 45 patients with synchronous multifocal lung adenocarcinomas.展开更多
文摘Field emission properties of carbon nanotube cold cathode （CNT-CC） of triode- and diode-structure have been investigated by using the finite element method of numerical simulation. Specially, the effects of gate voltage and hole radius R on the emission properties have been analyzed based on the finite element method. Results indicate that the gate can make the excitation electric field E increase, turn-on voltage decrease, and the emission current density J rise. The result shows that the E reaches its maximum value at the top of carbon nanotube （CNT）, and the optimum field emission performance can be obtained when R is equal to 10 times the diameter of the carbon nanotube.
文摘To the Editor:The differentiation of multiple primary lung adenocarcinomas (MPLAs) from metastases is important to allow for proper clinical management and prognostic prediction.The current revised diagnostic criteria for MPLAs proposed by the American College of Chest Physicians (ACCP) have been commonly applied since 2003.[1] However, it remains technically challenging to determine whether 2 or more lung adenocarcinomas from the same patient are homologous.Various approaches and algorithms including gene mutation analysis addressing this problem have been described.[2,3] Here, we present a cohort of 45 patients with synchronous multifocal lung adenocarcinomas.
