The hormone defined serum free conditioned medium (SFCM) of human nasopharyngeal carcinoma epithelioid cell line (CNE1) was assayed by both the 3H-thymidine incorporation test and the soft agar test. It was found that...The hormone defined serum free conditioned medium (SFCM) of human nasopharyngeal carcinoma epithelioid cell line (CNE1) was assayed by both the 3H-thymidine incorporation test and the soft agar test. It was found that the SFCM stimulated the growth of long-term serum-free cultured CNE4 cells in ac-cordence with the fact that the growth rate of long-term serum-free cultured CNE1 cells was directly proportional to the plating density. Alternatively 5% SFCM inhibited the growth of short-term serum-free cultured CNE4 cells by 51% in which the indicator cell remained the responsiveness state of growing in the serum-supplemented medium to the effector of interest. Furthermore, SFCM resulted in the inhibition of anchorage-independent growth of CNE4 cells and A431 cells. Also in soft agar test. SFCM reduced the colony formation of NRK(?),9F cells in the presence of EGF or EGF plus TGF-β. These finding suggested that CNE4 secreted autocrine growth stimulating factor(s) and growth inhibiting factor(s) in the serum-free medium, the latter strongly reverse malignant phenotypes of CNE4 and A431 cells in serum-supplemented surrounding.展开更多
Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)s...Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)scenario due to the fast development of in-home PLC.The aim of this paper is to evaluate the link-level performance of a medium voltage(MV)MIMO-OFDM communication system based on transmission link under underground power line channel.The MIMO channel is modeled as a modified multipath model in the presence of impulsive noise and background noise.We first perform a measurement on the practical MV MIMO channel parameters for a section of buried cable of 1 km long in Ganzhou city,Jiangxi province,China.Based on the measured channel,we design the frame structure based on an IEEE standard for broadband over power line networks[1]to support MV MIMO-OFDM transmission.According to designed frame structure,we design an encoder and a decoder for a dual binary tail-biting turbo code and optimize some key decoder parameters for low bit error rate performance.Finally,the link-level performance for both spatial multiplexing and spatial diversity are evaluated.Numeral results show that MV MIMO-OFDM is a promising approach to provide both high data rate and link reliability for PLC.展开更多
[Objective] The aim of this study is to reveal the disinfectants and disinfection methods,medium components,and embryoid culture method on dissociative microspore culture.[Method] B5 as basic medium appended with diff...[Objective] The aim of this study is to reveal the disinfectants and disinfection methods,medium components,and embryoid culture method on dissociative microspore culture.[Method] B5 as basic medium appended with different concentrations of sucrose,agar and different hormone combinations was used to optimize the culture technique for DH line in Brassica napus L.[Result] Both the 15 min disinfection of NaClO containing 5% Cl-and 10 min disinfection of 0.1% HgCl2 performed well in disinfection and subsequent embryo production;in the extraction process of dissociative microspores,B5 medium containing 2% sucrose could achieve a good embryo production effect;under dark condition microspores were firstly incubated at 32 ℃ 5-7 d,then at 25 ℃ 12-15 d,and finally transferred to 25 ℃ oscillator(60-65 r/min)for 3-7d,when the embryoid would become full ripeness;1/2MS medium appended with 1.2% agar,0.02% NAA,2.0 mg/L 6-BA,3.4 mg/L AgNO3 and 2% sucrose was helpful for embryoid differentiation and plantlet generation,presenting low degree of browning and slight vitrification.[Conclusion] The results may facilitate DH Line in rape production in large scale and high efficient transformation system.展开更多
Theoretical model and solutions on power line harmonic radiation (PLHR) propagating in the ground, air, and anisotropic homogeneous ionosphere are presented, The theoretical model is verified by the PLHR events obse...Theoretical model and solutions on power line harmonic radiation (PLHR) propagating in the ground, air, and anisotropic homogeneous ionosphere are presented, The theoretical model is verified by the PLHR events observed by the DEMETER satellite. Some propagation characteristics of PLHR based on the model are obtained. This paper is bene- ficial to quantitatively interpret the formation mechanism of PLHR phenomenon.展开更多
针对中压电力载波通信中由电力线信道的复杂特性和动态噪声环境导致的数据传输效率低下、抗干扰能力弱以及信号传输可靠性差的难题,将数字信号处理(digital signal processing,DSP)作为中压电力载波通信系统的核心控制单元,结合正交频...针对中压电力载波通信中由电力线信道的复杂特性和动态噪声环境导致的数据传输效率低下、抗干扰能力弱以及信号传输可靠性差的难题,将数字信号处理(digital signal processing,DSP)作为中压电力载波通信系统的核心控制单元,结合正交频分复用(orthogonal frequency division multiplexing,OFDM)模块和长短期记忆(long short-term memory,LSTM)网络信道噪声模型设计,实现了一种高度集成且智能化的通信技术系统。该系统能够根据电力线信道的复杂特性和动态变化的噪声环境,通过合理分配子载波资源、高效调制解调和实时噪声预测与抑制,显著提高通信系统的频谱效率、抗干扰能力和信号传输的可靠性。实验结果表明,该设计的平均绝对百分比误差(mean absolute percentage error,MAPE)仅为10.62%,均方根误差(root mean square error,RMSE)仅为7.20%。所提系统为中压电力载波通信提供了一种高效、精确的解决方案,有助于推动智能电网、远程监控等领域的进一步发展。展开更多
文摘The hormone defined serum free conditioned medium (SFCM) of human nasopharyngeal carcinoma epithelioid cell line (CNE1) was assayed by both the 3H-thymidine incorporation test and the soft agar test. It was found that the SFCM stimulated the growth of long-term serum-free cultured CNE4 cells in ac-cordence with the fact that the growth rate of long-term serum-free cultured CNE1 cells was directly proportional to the plating density. Alternatively 5% SFCM inhibited the growth of short-term serum-free cultured CNE4 cells by 51% in which the indicator cell remained the responsiveness state of growing in the serum-supplemented medium to the effector of interest. Furthermore, SFCM resulted in the inhibition of anchorage-independent growth of CNE4 cells and A431 cells. Also in soft agar test. SFCM reduced the colony formation of NRK(?),9F cells in the presence of EGF or EGF plus TGF-β. These finding suggested that CNE4 secreted autocrine growth stimulating factor(s) and growth inhibiting factor(s) in the serum-free medium, the latter strongly reverse malignant phenotypes of CNE4 and A431 cells in serum-supplemented surrounding.
文摘Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)scenario due to the fast development of in-home PLC.The aim of this paper is to evaluate the link-level performance of a medium voltage(MV)MIMO-OFDM communication system based on transmission link under underground power line channel.The MIMO channel is modeled as a modified multipath model in the presence of impulsive noise and background noise.We first perform a measurement on the practical MV MIMO channel parameters for a section of buried cable of 1 km long in Ganzhou city,Jiangxi province,China.Based on the measured channel,we design the frame structure based on an IEEE standard for broadband over power line networks[1]to support MV MIMO-OFDM transmission.According to designed frame structure,we design an encoder and a decoder for a dual binary tail-biting turbo code and optimize some key decoder parameters for low bit error rate performance.Finally,the link-level performance for both spatial multiplexing and spatial diversity are evaluated.Numeral results show that MV MIMO-OFDM is a promising approach to provide both high data rate and link reliability for PLC.
基金Supported by the Fund of Science and Technology in Guizhou Province[(2007)0281]the Fund of Guizhou Academy of Agricultural Sciences[(2007)013]+2 种基金the Nomarch Special Foundation for the Excellent Science and Technology Talents of Guizhou Province[(2005)40]Key Science and Technology Project in Guizhou Province[(2006)3008]Program from Science and Technology Department of Guizhou Province[(2008)-008]~~
文摘[Objective] The aim of this study is to reveal the disinfectants and disinfection methods,medium components,and embryoid culture method on dissociative microspore culture.[Method] B5 as basic medium appended with different concentrations of sucrose,agar and different hormone combinations was used to optimize the culture technique for DH line in Brassica napus L.[Result] Both the 15 min disinfection of NaClO containing 5% Cl-and 10 min disinfection of 0.1% HgCl2 performed well in disinfection and subsequent embryo production;in the extraction process of dissociative microspores,B5 medium containing 2% sucrose could achieve a good embryo production effect;under dark condition microspores were firstly incubated at 32 ℃ 5-7 d,then at 25 ℃ 12-15 d,and finally transferred to 25 ℃ oscillator(60-65 r/min)for 3-7d,when the embryoid would become full ripeness;1/2MS medium appended with 1.2% agar,0.02% NAA,2.0 mg/L 6-BA,3.4 mg/L AgNO3 and 2% sucrose was helpful for embryoid differentiation and plantlet generation,presenting low degree of browning and slight vitrification.[Conclusion] The results may facilitate DH Line in rape production in large scale and high efficient transformation system.
基金Project supported by the National Natural Science Foundation of China(Grant No.51207006)the Natural Science Foundation of Beijing,China(Grant No.3123038)
文摘Theoretical model and solutions on power line harmonic radiation (PLHR) propagating in the ground, air, and anisotropic homogeneous ionosphere are presented, The theoretical model is verified by the PLHR events observed by the DEMETER satellite. Some propagation characteristics of PLHR based on the model are obtained. This paper is bene- ficial to quantitatively interpret the formation mechanism of PLHR phenomenon.
文摘针对中压电力载波通信中由电力线信道的复杂特性和动态噪声环境导致的数据传输效率低下、抗干扰能力弱以及信号传输可靠性差的难题,将数字信号处理(digital signal processing,DSP)作为中压电力载波通信系统的核心控制单元,结合正交频分复用(orthogonal frequency division multiplexing,OFDM)模块和长短期记忆(long short-term memory,LSTM)网络信道噪声模型设计,实现了一种高度集成且智能化的通信技术系统。该系统能够根据电力线信道的复杂特性和动态变化的噪声环境,通过合理分配子载波资源、高效调制解调和实时噪声预测与抑制,显著提高通信系统的频谱效率、抗干扰能力和信号传输的可靠性。实验结果表明,该设计的平均绝对百分比误差(mean absolute percentage error,MAPE)仅为10.62%,均方根误差(root mean square error,RMSE)仅为7.20%。所提系统为中压电力载波通信提供了一种高效、精确的解决方案,有助于推动智能电网、远程监控等领域的进一步发展。