Towards variance-matrix characterization of complementarity relations in a continuous variable system

We discuss complementarity relations in a bipartite continuous variable system. Building up from the work done on discrete d-dimensional systems, we prove that for symmetric two-mode states, quantum complementarity relations can be put in a simple relation with the elements of the variance matrix. When this condition is not satisfied, such a connection becomes non-trivial. Our investigation is the first step towards an operative characterization of the complementarity in a scenario that has not been investigated so far.Comment: 7 pages, 4 figures, RevTeX

Lepidobatrachus laevis

Number of Pages: 16Integrative BiologyGeological Science

Economies of Scale for Real Estate Investment Trusts

Using the translog cost function to estimate economies of scale for a sample of Real Estate Investment Trusts for the years 1992-1994, we find significant evidence that economies of scale exist for REITs for all years examined. The results show that measurement of scale economies is sensitive to the model used for the measurement. Individual characteristics of the REIT, such as type of management and degree of leverage, affect the magnitude of the scale economy. Additional variables accounting for property type diversification and geographic influences have little additional impact on the measured scale economies. Finally, the measured economies of scale for REITs vary considerably over time.

US and foreign alloy cross-reference database

Marshall Space Flight Center and other NASA installations have a continuing requirement for materials data from other countries involved with the development of joint international Spacelab experiments and other hardware. This need includes collecting data for common alloys to ascertain composition, physical properties, specifications, and designations. This data is scattered throughout a large number of specification statements, standards, handbooks, and other technical literature which make a manual search both tedious and often limited in extent. In recognition of this problem, a computerized database of information on alloys was developed along with the software necessary to provide the desired functions to access this data. The intention was to produce an initial database covering aluminum alloys, along with the program to provide a user-interface to the data, and then later to extend and refine the database to include other nonferrous and ferrous alloys

Maintenance of Residential Rental Property: An Empirical Analysis

The maintenance costs of 137 residential rental properties in northwestern South Carolina are analyzed. The results show that maintenance cost per square foot increases with property age, tenant turnover, certain amenities, and for higher-rent properties. Compared to other property types, apartments exhibit higher maintenance costs per square foot with larger complexes showing lower per square foot maintenance costs than smaller complexes. This cost economy suggests added value to rental housing for larger complexes. Owners of multiple properties are found to pay higher maintenance costs. Finally, there is no observed relationship between absentee ownership and the level of property maintenance.

Small RNAs: How Seeds Remember To Obey Their Mother

SummaryThe endosperm is one of two products from the double fertilization event that occurs during sexual reproduction in flowering plants. A series of recent reports highlights the unusual genetic regulatory mechanisms that occur in endosperm and suggests a role for transposon regulation in imprinting

Video Cassettes Tops

Video cassettes came out on top in a test of teaching effectiveness