ADDITIONAL NOTE

G G r Machine Repair Problem with Spares and Additional Repairman (TECHNICAL NOTE)

The machine repair problem with spares and additional repairman is analyzed. The interfailure and repair times of the units are general identical and independently distributed. The failure and repair rates are assumed to be state dependent. Using diffusion approximation technique, we obtain the queue size distribution under steady state. The average number of failed units, average number of ope...

M M m K Queue With Additional Servers and Discouragement (RESEARCH NOTE)

Waiting in long queue is undesirable due to which in some practical situations customers become impatient and leave the system. In such cases providing additional servers can reduce long queue. This investigation deals with multi-server queueing system with additional servers and discouragement. The customers arrive in poisson fashion and are served exponentially by a pool of permanent and addi...

Note from the Editor: Additional Changes for Authors

In the May 2008 issue of EHP, I indicated in the editorial “Recent Changes at Environmental Health Perspectives” that we were planning to implement a new web-based manuscript submission and tracking system. I am pleased to announce that, as of 15 July 2008, all manuscripts submitted to the journal are being handled by ScholarOne’s Manuscript Central. We are joining more than 170 societies and p...

An additional note on malignancy in plantar ulcers in leprosy.

A Note on Additional Properties of Sign Changing Solutions to Superlinear Elliptic Equations

We obtain upper bounds for the number of nodal domains of sign changing solutions of semilinear elliptic Dirichlet problems using suitable min-max descriptions. These are consequences of a generalization of Courant’s nodal domain theorem. The solutions need not to be isolated. We also obtain information on the Morse index of solutions and the location of suband supersolutions.