Research of Two-Dimensional Airflow Angular Velocity Sensor

Proposed a two-dimensional air-angular velocity sensor. Dual vertical heat resistance wire, two-dimensional angular velocity sensitive; By simply supported edge piezoelectric pump support to improve the sensitivity of the sensor; Using stacked sheet round table groove type nozzle, improved stability and repeatability of the sensor; Using software compensation processing to improve the temperature performance and linearity of the sensor. Experimental results show that the sensitivity of the sensor improve nearly double, Zero variation decrease from≤10% to≤0.2%, operating temperature extended from-10°C~+40°C to-45°C~+65°C, linearity decrease from≤1% to ≤0.5%, the amount of sensitivity decrease from ≤10% to≤0.6%.

Sensitivity Analysis of Surface Accuracy of Mesh Antennas to Cable Length

To research the surface accuracy sensitivity of mesh antennas to cable length, the whole coordinates interaction method (WCIM) and the difference algorithm for sensitivity calculation are used. The calculating model of a large hoop truss mesh antenna was studied, and then some valuable conclusions were drawn from analyzing the calculating results of the numerical example, the feasibility of the approach were also proved. In the same situation of equilibrium, the surface accuracy sensitivity to the length of the individual cable is different. With the initial tensions in the networks increase, the sensitivity to the length of all the cables and the range of sensitivity decrease. The algorithm presented can be used to optimize the networks and adjust the surface accuracy of mesh antennas.

Monitoring and Tracking Changes in Sensitivity to Azoxystrobin Fungicide in Alternaria solani in Wisconsin

Azoxystrobin is a common fungicide used by farmers of Solanaceous crops against Alternaria solani, but there was growing concern about decreased sensitivity with repeated applications. In 2002 and 2003, monitoring of A. solani from commercial potato fields in Wisconsin indicated increased frequency and a statewide distribution of isolates with decreased in vitro sensitivity to azoxystrobin. Mean effective concentration in inhibiting spore germination by 50% values gathered in 2002 and 2003 were approximately 20-fold higher than baseline isolates of A. solani collected in 1998 from fields that had never been treated with azoxystrobin. This sensitivity decrease was correlated with site-specific mutations in the cytochrome b detected by quantitative real-time polymerase chain reaction. The F129L and the G143A substitution have been shown to cause a reduction in sensitivity or resistance, respectively, to quinone outside inhibitors. All of the recovered A. solani isolates collected in 2002 and 2003 were wild type at position 143. However, all three mutations responsible for the F129L substitution (TTA, CTC, and TTG) were detected in our samples. In addition, the frequency of this amino acid substitution in A. solani isolates was statistically different across sampling sites and years, indicating that sensitivity changes depended on specific disease management practices.