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Michael, The nest-building social wasps (Vespulidae) will use empty bird houses for nesting sites. In fact this can be very hazardous for both the birds and for people that work with the houses. You
It was posted under my most recent answer. It was asked under a different name, but with the exact same phrasing and typographical errors. Are you two different people who asked the exact same question?
The picture is a little blurry, but this might be a sharpshooter leafhopper. They suck sap from woody plants. Treatments include systemics like Bayer Tree and Shrub insect control or topical sprays approved
The pressure inside and outside a sealed chamber can be different, yes. They can also be the same, it depends on the pressure of air inside the chamber when it was sealed. Air is far more compressible
Dear mohammad The very consideration is the stiffness of the springs which is related to the nature ( Subgrade modulus of the soil) . I suggest you to perform a sensitivity study on influence of variation