Buckling Columns. In the study of the buckling of a column whose cross section varies, one encounters the equation where x is related to the height above the ground and y is the deflection away from the vertical. The positive constant ? depends on the rigidity of the column, its moment of inertia at the top, and the load. The positive integer n depends on the type of column. For example, when the column is a truncated cone [see Figure 8.13(a)], we have n = 4.
Principles of Biology week 6 Notes Lesson 9: communication via neurons Neural Communication How does this information travel Sensory Neuron o Interneurons Motor Neurons Sufficient Excitation o Disrupt resting potential Threshold potential exceeded Electrochemical signal o Cellular communication Potentials – Electrical differences - Resting Potential o Average -70mV + outside – Inside - Threshold potential o Average -55mV Must be exceeded - Action Potential o All or none Refractory period= no action potential Resting Potential Maintenance Na+, K+, pumps