The impact of urban operations on helicopter noise requirements

The interrelationship of urban helicopter operations, helicopter noise, and the establishment of urban public-use heliports is discussed. Public resistance to urban helicopter operations due to concern for safety and noise is shown to negatively impact the establishment of public-use heliports in urban centers. It is indicated that increased government and industry effort to reduce helicopter noise is needed to ensure continued growth in the helicopter industry

Extraditing Mexican Nationals in the Fight Against International Narcotics Crimes

In recent years, Mexican narcotics trafficking has become a major threat to the security of the Americas. Mexican narco-traffickers have used their wealth and violence to corrupt political and judicial systems and avoid effective prosecution or penalty in Mexican courts. Historically, Mexico has refused to extradite its nationals in reliance on Mexican law prohibiting the extradition of nationals in all but exceptional cases. This Note argues that Mexico should take a step toward controlling the cross-border narcotics trade and recognize international drug trafficking as an exceptional crime. Upon recognizing narcotics crimes as exceptional, Mexico should then begin extraditing Mexican narco-traffickers to the United States

Constitutional Law—Civil Rights— Threat to Public Order Held Superior to Freedom of Speech

Feiner v. New York, __ U. S. __, 71 S. Ct. 303 (1951)

A BPS Interpretation of Shape Invariance

We show that shape invariance appears when a quantum mechanical model is invariant under a centrally extended superalgebra endowed with an additional symmetry generator, which we dub the shift operator. The familiar mathematical and physical results of shape invariance then arise from the BPS structure associated with this shift operator. The shift operator also ensures that there is a one-to-one correspondence between the energy levels of such a model and the energies of the BPS-saturating states. These findings thus provide a more comprehensive algebraic setting for understanding shape invariance.Comment: 15 pages, 2 figures, LaTe