We report 3 cases of Queensland tick typhus (QTT) and 1 case of African tick bite fever in which the causative rickettsiae were detected by PCR of eschar and skin lesions in all cases. An oral mucosal lesion in 1 QTT case was also positive.

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The coupling test of marine atmospheric environment and tensile-compressive fatigue load for 2A12 aluminum alloy was carried out in outdoor environment of Hainan station by coupling test equipment of mechanical load. The coupling effect of marine atmospheric environment corrosion and tensile-compressive fatigue load on the environmental damage behavior of 2A12 aluminum alloy was discussed from the aspects of corrosion morphology, tensile properties and fracture morphology. The results show that the corrosion characteristics of 2A12 aluminum alloy in coupling test and static exposure test are consistent. The corrosion depths of the static exposure test for 6 months and the coupling test for 35 days are 71 μm and 121 μm, respectively. The results of tensile properties show that the decrease rate of tensile properties of 2A12 aluminum alloy are accelerated by the coupling effect. And the accelerated ratio of the coupling test was more than 10 times that of the static exposure test. The fracture morphology shows that the coupling fracture crack of 2A12 aluminum alloy starts from the corrosion surface, and the crack source and propagation zone are quasi-cleavage fatigue crack propagation characteristics. The coupling test results are closer to the actual situation of equipment, which has important reference value for the design and material selection of bearing structure.

High-speed vertical-cavity surface-emitting lasers that could be modulated up to 10 Giga-bit-per-second (Gbps) were accomplished by using additional proton implantation to reduce the parasitic capacitance. The eye diagram of the implanted device shows a noticeable improvement when compared with those devices without implantation. In contrast to previous reports, moreover, the output power-current-voltage (L-I-V) characteristics of the fabricated devices in this study show excellent consistency between before and after implantation. The high-temperature lifetime of devices fabricated with a similar process has already exceeded 8100 h up to the present day.

Articles you may be interested inMultiwavelength fabrication of vertical-cavity surface-emitting lasers based on asymmetric one-dimensional photonic crystalInterpretation of polarization pinning due to scattering loss differentiation in asymmetric vertical-cavity surfaceemitting laser cavitiesIn this article, we investigate the influence of electrostatic discharge ͑ESD͒ stress voltage on the device performance of 850 nm vertical-cavity surface-emitting lasers ͑VCSELs͒. The ESD effect induces dark-region defects, which act as nonradiative recombination centers in the active layer and increase the leakage current and degrade the light output power. Without ESD stress voltage, the VCSELs exhibit multiple transverse mode. However, the devices exhibit a weak but single fundamental mode with smaller beam divergence by increasing the stress voltage up to 2.6 kV. In addition, the VCSELs have serious degradation in light output power and a lifetime of less than 5 h at stress voltage beyond the ESD threshold voltage of 1.2 kV.