为了分离鉴定海南某养殖场黑山羊流鼻液、打喷嚏这一临床症状可能的致病菌,试验通过对病羊鼻拭子的无菌采集、病原菌分离培养后,利用革兰氏染色、细菌生化反应、细菌16S r RNA通用引物进行PCR反应等方法对分离得到的菌株进行鉴定。结果...为了分离鉴定海南某养殖场黑山羊流鼻液、打喷嚏这一临床症状可能的致病菌,试验通过对病羊鼻拭子的无菌采集、病原菌分离培养后,利用革兰氏染色、细菌生化反应、细菌16S r RNA通用引物进行PCR反应等方法对分离得到的菌株进行鉴定。结果表明:对病羊鼻拭子培养后,得到的菌落形态一致;通过染色发现该菌为短杆状革兰氏阴性菌,进一步鉴定该菌为雷氏普罗威登斯菌。可引起海南黑山羊呼吸道疾病,为相应疾病的诊断和治疗奠基了一定的基础。展开更多
Effects of linear and solitary internal waves on the temporal correlation of matched- field processing (MFP) in shallow water are numerically investigated for acoustic sources with different frequencies and depths b...Effects of linear and solitary internal waves on the temporal correlation of matched- field processing (MFP) in shallow water are numerically investigated for acoustic sources with different frequencies and depths based on oceanographic data from an experiment. It is shown that the temporal correlation of MFP decreases as the amplitude of solitary internal waves or the average energy density of linear internal waves increases. For acoustic source with lower frequency or located below the thermocline, the temporal correlation of MFP is less affected by internal waves, and the temporal correlation length of MFP is longer. Moreover, the effects of the range from solitary internal waves to acoustic source on the temporal correlation of MFP are relatively small.展开更多
A novel scheme for all-optical broadcast ultra-wideband(UWB) monocycle pulses generation based on cross-phase modulation(XPM) in semiconductor fiber ring laser(SFRL) is proposed, in which three UWB positive or negativ...A novel scheme for all-optical broadcast ultra-wideband(UWB) monocycle pulses generation based on cross-phase modulation(XPM) in semiconductor fiber ring laser(SFRL) is proposed, in which three UWB positive or negative monocycle pulses can be generated simultaneously. A comprehensive broad-band dynamic model for this kind of all-optical broadcast UWB monocycle sources is established, which is further applied to numerically analyze the impacts of injection current of semiconductor optical amplifier(SOA), the power and wavelength of the signal light on the performance of the UWB positive monocycle pulses with higher power spectral density. The results show that the spectra of the UWB positive and negative monocycle pulses generated by this scheme match the Federal Communications Commission(FCC) definition quite well. Three UWB positive monocycle pulses with better performance can be obtained when the power of signal light is at a high level, and three other UWB positive monocycle pulses with good tolerance to both the injection current of the SOA and the wavelength of the signal light can be obtained. In addition, the powers of the lasing light coupled into the SFRL should not be strong to obtain three UWB positive monocycle pulses with better performance.展开更多
An adaptive nonlinear prediction algorithm is proposed to predict ocean reverberation based on the phase space reconstruction of nonlinear dynamic system. The prediction algorithm is tested by experimental reverberati...An adaptive nonlinear prediction algorithm is proposed to predict ocean reverberation based on the phase space reconstruction of nonlinear dynamic system. The prediction algorithm is tested by experimental reverberation data measured in two areas, and the one-step forward prediction results are in good agreement with the experimental data. If the errors between the predicted and experimental data are chosen as the variable to detect the target in the reverberation series, the reverberation is suppressed and the signal-to-reverberation ratio is improved.展开更多
文摘为了分离鉴定海南某养殖场黑山羊流鼻液、打喷嚏这一临床症状可能的致病菌,试验通过对病羊鼻拭子的无菌采集、病原菌分离培养后,利用革兰氏染色、细菌生化反应、细菌16S r RNA通用引物进行PCR反应等方法对分离得到的菌株进行鉴定。结果表明:对病羊鼻拭子培养后,得到的菌落形态一致;通过染色发现该菌为短杆状革兰氏阴性菌,进一步鉴定该菌为雷氏普罗威登斯菌。可引起海南黑山羊呼吸道疾病,为相应疾病的诊断和治疗奠基了一定的基础。
基金supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX1-YW-12-2)by the National Natural Science Foundation of China(10974218)
文摘Effects of linear and solitary internal waves on the temporal correlation of matched- field processing (MFP) in shallow water are numerically investigated for acoustic sources with different frequencies and depths based on oceanographic data from an experiment. It is shown that the temporal correlation of MFP decreases as the amplitude of solitary internal waves or the average energy density of linear internal waves increases. For acoustic source with lower frequency or located below the thermocline, the temporal correlation of MFP is less affected by internal waves, and the temporal correlation length of MFP is longer. Moreover, the effects of the range from solitary internal waves to acoustic source on the temporal correlation of MFP are relatively small.
基金supported by the Hainan Provincial Natural Science Foundation of China(No.620MS078).
文摘A novel scheme for all-optical broadcast ultra-wideband(UWB) monocycle pulses generation based on cross-phase modulation(XPM) in semiconductor fiber ring laser(SFRL) is proposed, in which three UWB positive or negative monocycle pulses can be generated simultaneously. A comprehensive broad-band dynamic model for this kind of all-optical broadcast UWB monocycle sources is established, which is further applied to numerically analyze the impacts of injection current of semiconductor optical amplifier(SOA), the power and wavelength of the signal light on the performance of the UWB positive monocycle pulses with higher power spectral density. The results show that the spectra of the UWB positive and negative monocycle pulses generated by this scheme match the Federal Communications Commission(FCC) definition quite well. Three UWB positive monocycle pulses with better performance can be obtained when the power of signal light is at a high level, and three other UWB positive monocycle pulses with good tolerance to both the injection current of the SOA and the wavelength of the signal light can be obtained. In addition, the powers of the lasing light coupled into the SFRL should not be strong to obtain three UWB positive monocycle pulses with better performance.
基金supported by the National Natural Science Foundation of China(10734100)supportedby the Knowledge Innovation Program of the Chinese Academy of Sciences.
文摘An adaptive nonlinear prediction algorithm is proposed to predict ocean reverberation based on the phase space reconstruction of nonlinear dynamic system. The prediction algorithm is tested by experimental reverberation data measured in two areas, and the one-step forward prediction results are in good agreement with the experimental data. If the errors between the predicted and experimental data are chosen as the variable to detect the target in the reverberation series, the reverberation is suppressed and the signal-to-reverberation ratio is improved.