Sufficient conditions are obtained for the boundedness of solutions of the non-linear nonautonomous neutral equation i(t)=r(f)x(t)(a(f)-.x(t-1)-c(/).?(t-1)), which arise in a " food-limited " population model. This partially answers a recent open question proposed The nonlinear neutral delay logistic equation was first introduced and extensively discussed in [6], dx(t)-=i(t)=rx(t)(l-(x(t-)+ci(t...

the current challenge in health services research is disability to present comprehensive and effective intervention plans for community health promotion. there are numerous reasons in this regard, some of which can be overcome through performance-based participatory research methods. the population research center (prc) in tehran university of medical sciences (tums) provides the necessary grou...

In this paper, we consider the extension of multi-objective constraint optimization algorithms to the case where there are additional tradeoffs, reducing the number of optimal solutions. We focus especially on branch-and-bound algorithms which use a mini-buckets algorithm for generating the upper bound at each node (in the context of maximizing values of objectives). Since the main bottleneck o...

Starting from the microscopic theory of Bardeen-Cooper-Schrieffer (BCS) for the fermionic superfluids, we show that the vortex dynamics can be followed naturally by extending Feynman’s influence functional approach to incorporate the transverse force. There is a striking mutual independence of the transverse and longitudinal influences: The former has the topological origin and is insensitive t...

In this chapter, we present a propositional calculus for several intervalvalued fuzzy logics, i.e., logics having intervals as truth values. More precisely, the truth values are preferably subintervals of the unit interval. The idea behind it is that such an interval can model imprecise information. To compute the truth values of ‘p implies q’ and ‘p and q’, given the truth values of p and q, w...

In this paper we consider three points. 1) Etho-logical behaviour models are not grounded in exhibited behaviour-the models have not been developed far enough, indeed, work in the ani-mat community may help ethology; 2) In order to assess agent performance we should try to develop a functional account of behaviour whilst developing a mechanistic account; 3) Planning and reasoning is not necessa...