In this paper, the authors present the transmission line (TL) realization of one-dimensional subwavelength resonator formed by a pair of conventional right-handed material (RHM) and left-handed material (LHM). In such...In this paper, the authors present the transmission line (TL) realization of one-dimensional subwavelength resonator formed by a pair of conventional right-handed material (RHM) and left-handed material (LHM). In such resonator, a novel reso- nant mode with the resonant frequency depending on the length ratio of the RH/LH TL sections occurs as a consequence of the full phase compensation due to the backward wave in the LH TL section. The theoretical circuit-model analyses are supported by simulation and experimental evidence on resonators with different RH/LH length ratios.展开更多
A three-layer waveguide structure sensor consists of LHMs （left-handed materials） film surrounded by dielectric cladding and antiferromagnetie substrate is proposed. LHMs known as MTMs （metamaterials） have simulta...A three-layer waveguide structure sensor consists of LHMs （left-handed materials） film surrounded by dielectric cladding and antiferromagnetie substrate is proposed. LHMs known as MTMs （metamaterials） have simultaneous negative permeability and permittivity. The dispersion relation for the structure is derived for TE guided modes. Two ranges of frequencies are chosen such that Voigt permeability,μv, either negative or positive. The sensitivity is proven to be affected by different parameters including the film thickness, LHM parameters, and Voigt frequency.展开更多
1.故障现象 我单位1台L H M250型高塔吊抓斗在进行作业时，出现卷扬动作不同步故障，并且无报警信号。抓斗作业与吊钩作业不同，对抓斗升降卷扬和抓斗开闭卷扬的同步要求比较高。一旦抓斗升降卷扬和抓斗开闭卷扬不同步，将影响抓斗正...1.故障现象 我单位1台L H M250型高塔吊抓斗在进行作业时，出现卷扬动作不同步故障，并且无报警信号。抓斗作业与吊钩作业不同，对抓斗升降卷扬和抓斗开闭卷扬的同步要求比较高。一旦抓斗升降卷扬和抓斗开闭卷扬不同步，将影响抓斗正常作业。 为了尽快找出故障部位，技术人员到生产现场进行高塔吊卷扬操作实验。通过反复操作、仔细观察，最终认为抓斗升降卷扬和抓斗开闭卷扬不同步的原因是抓斗作业时，抓斗开闭卷扬动作正常，而抓斗升降卷扬无动作，由此造成卷扬动作不同步。其原因可能是抓斗升降卷扬电控系统出现故障。展开更多
1台港口用L H M250型高塔吊工作中CPU显示器显示“0601”故障报警信号后，发动机随即熄火，高塔吊无法进行生产作业。
1.故障分析
该高塔吊发动机分别驱动1台低压发电机和1台高压发电机。低压发电机输出24V直流电，为启动用蓄电池...1台港口用L H M250型高塔吊工作中CPU显示器显示“0601”故障报警信号后，发动机随即熄火，高塔吊无法进行生产作业。
1.故障分析
该高塔吊发动机分别驱动1台低压发电机和1台高压发电机。低压发电机输出24V直流电，为启动用蓄电池充电。高压发电机输出380V三相交流电，为高塔吊照明供电。经过初步判断，“0601”故障报警信号是高压发电机存在故障。展开更多
We experimentally investigated the defect ef- fects of LHMs when panel-allocated defects SRRs are intro- duced. By measuring the X-band transmission through metamaterial with different sizes and orientations panel- al...We experimentally investigated the defect ef- fects of LHMs when panel-allocated defects SRRs are intro- duced. By measuring the X-band transmission through metamaterial with different sizes and orientations panel- allocated defect SRRs, it was found that characters of reso- nant peak, including resonance frequency, magnitude and band pass, markedly change. And the panel-allocated defects in LHMs have more effect on electromagnetic behavior than that of dot and linear ones. It is thought that the existences of panel-allocated defects break the symmetry of perfect LHMs and result in a new electromagnetic resonance.展开更多
基金Project supported by the National Basic Research Program (973) of China (No. 2004CB719800) and the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20030284024)
文摘In this paper, the authors present the transmission line (TL) realization of one-dimensional subwavelength resonator formed by a pair of conventional right-handed material (RHM) and left-handed material (LHM). In such resonator, a novel reso- nant mode with the resonant frequency depending on the length ratio of the RH/LH TL sections occurs as a consequence of the full phase compensation due to the backward wave in the LH TL section. The theoretical circuit-model analyses are supported by simulation and experimental evidence on resonators with different RH/LH length ratios.
文摘A three-layer waveguide structure sensor consists of LHMs （left-handed materials） film surrounded by dielectric cladding and antiferromagnetie substrate is proposed. LHMs known as MTMs （metamaterials） have simultaneous negative permeability and permittivity. The dispersion relation for the structure is derived for TE guided modes. Two ranges of frequencies are chosen such that Voigt permeability,μv, either negative or positive. The sensitivity is proven to be affected by different parameters including the film thickness, LHM parameters, and Voigt frequency.
文摘1.故障现象 我单位1台L H M250型高塔吊抓斗在进行作业时，出现卷扬动作不同步故障，并且无报警信号。抓斗作业与吊钩作业不同，对抓斗升降卷扬和抓斗开闭卷扬的同步要求比较高。一旦抓斗升降卷扬和抓斗开闭卷扬不同步，将影响抓斗正常作业。 为了尽快找出故障部位，技术人员到生产现场进行高塔吊卷扬操作实验。通过反复操作、仔细观察，最终认为抓斗升降卷扬和抓斗开闭卷扬不同步的原因是抓斗作业时，抓斗开闭卷扬动作正常，而抓斗升降卷扬无动作，由此造成卷扬动作不同步。其原因可能是抓斗升降卷扬电控系统出现故障。
文摘1台港口用L H M250型高塔吊工作中CPU显示器显示“0601”故障报警信号后，发动机随即熄火，高塔吊无法进行生产作业。
1.故障分析
该高塔吊发动机分别驱动1台低压发电机和1台高压发电机。低压发电机输出24V直流电，为启动用蓄电池充电。高压发电机输出380V三相交流电，为高塔吊照明供电。经过初步判断，“0601”故障报警信号是高压发电机存在故障。
文摘We experimentally investigated the defect ef- fects of LHMs when panel-allocated defects SRRs are intro- duced. By measuring the X-band transmission through metamaterial with different sizes and orientations panel- allocated defect SRRs, it was found that characters of reso- nant peak, including resonance frequency, magnitude and band pass, markedly change. And the panel-allocated defects in LHMs have more effect on electromagnetic behavior than that of dot and linear ones. It is thought that the existences of panel-allocated defects break the symmetry of perfect LHMs and result in a new electromagnetic resonance.
