Your editorial opposing the United States-India agreement on civil nuclear cooperation urges Congress to delay passing the legislation that will permit the United States to carry out that agreement ("A Bad Deal," Sept. 9).
In every other state, he said, regulators have imposed rate freezes to protect consumers during the transition to a competitive market, or at least required electricity companies to delay passing on cost increases to their customers.
However, the viruses will be out of control when the delay passes through the critical value.
It is found that a Hopf bifurcation can occur as the time delay passes some critical values.
That is, a family of periodic solutions bifurcate from the endemic equilibrium when the delay passes through the critical value.
In particular, our mathematical analysis reveals that a Hopf bifurcation occurs when immune activation delay passes through a critical value.
It is found that the Neimark-Sacker bifurcation exists when the delay passes a sequence of critical values.
When the delay passes through some critical values, the positive equilibrium loses its stability and Hopf bifurcations occur.
It is found that there exist the stability switches when delay varies, and the Hopf bifurcation occurs when the delay passes through a sequence of critical values.
