University of Nebraska Omaha

About: University of Nebraska Omaha is a education organization based out in Omaha, Nebraska, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 4526 authors who have published 8905 publications receiving 213914 citations. The organization is also known as: UNO & University of Omaha.

Less than meets the eye -- police department bias-crime units.

Abstract: In the USA, rising concern about ethnic conflict has led to the creation of special bias crime units (BCUs) in a number of police departments. The vast majority of states have some form of hate crime legislation against crimes motivated by race, religion, gender, etc. Criticisms have been leveled against this legislation, among them the claim that it could be a tool for discrimination against minorities or that the laws are largely a symbolic response to ethnic conflict. Records an exploratory study of BCUs in 16 small to medium police departments in central USA. Notes that an officer who is prejudiced against a group may fail to apply the law. Details the variety among the departments surveyed, of which only 25 per cent had established a BCU. Concludes that departments’ commitment to BCUs is weak in general. Also finds that Law Enforcement Management Administrative Statistics (LEMAS) data, although widely used, is often inaccurate, due to the inherent limitations of mail surveys.

Why semiconducting single-walled carbon nanotubes are separated from their metallic counterparts.

Abstract: The separation of single-walled carbon nanotubes (SWNTs) according to their electronic structure has attracted much recent attention. In many cases, metallic SWNTs are separated from semiconducting SWNTs and enriched in the supernatant due to stronger interaction between metallic SWNTs and adsorbates. However, the inverse separation of semiconducting from metallic SWNTs is often observed. In this computational study, the underlying mechanism is elucidated by density functional theory. We show that the shape of an aromatic molecule, the degree of hybridization between a molecule and a SWNT, and the oxidative state of SWNTs can affect the type of enriched SWNTs. In principle, one can control the type of enriched SWNTs by selecting a structurally compatible aromatic molecule or changing the hole concentration of the SWNTs.