Given X a smooth projective threefold, E a rank-two vector bundle on X and k, δ two positive integers, we determine effective and uniform upper-bounds for δ, which are linear polynomials in k, such that the family Vδ(E(k)), parametrizing irreducible and δ-nodal curves which are zero-loci of global sections of the vector bundle E(k) on X, is smooth and of the expected dimension (regular, for sho...

We consider scheduling problems in which a job consists of components of different types to be processed on m machines. Each machine is capable of processing components of a single type. Different components of a job are independent and can be processed in parallel on different machines. A job is considered as completed only when all its components have been completed. We study both completion ...

in this article, we investigate sufficient conditions for existence of maximal and minimalsolutions to a coupled system of highly nonlinear differential equations of fractional order with mixedtype boundary conditions. to achieve this goal, we apply monotone iterative technique togetherwith the method of upper and lower solutions. also an error estimation is given to check theaccuracy of the me...

Let $N$ be a submodule of a module $M$ and a minimal primary decomposition of $N$ is known‎. ‎A formula to compute Baer's lower nilradical of $N$ is given‎. ‎The relations between classical prime submodules and their nilradicals are investigated‎. ‎Some situations in which semiprime submodules can be written as finite intersection of classical prime submodule are stated‎.

this study is concerned with understanding the impact of demographic changes, socioeconomic inequalities, and the availability of health factors on life expectancy (le) in the low and lower middle income countries.the cross-country data were collected from 91 countries from the united nations agencies in 2012. le is the response variable with demographics (total fertility rate, and adolescent f...

in this paper, a new molecular-structure descriptor, the general sum–connectivity co–index  is considered, which generalizes the first zagreb co–index and the general sum–connectivity index of graph theory. we mainly explore the lower and upper bounds in termsof the order and size for this new invariant. additionally, the nordhaus–gaddum–type resultis also represented.

In this paper we consider a two dimensional strip packing problem. The problem consists of packing a set of rectangular items in one strip of width W and infinite height. They must be packed without overlapping, parallel to the edge of the strip and we assume that the items are oriented, i.e. they cannot be rotated. To solve this problem, we use three exact methods: a branch and bound method, a...

background: the most expensive variable in the operating room (or) is time. lean process management is being used in the medical field to improve efficiency in the or. streamlining individual processes within the or is crucial to a comprehensive time saving and cost-cutting health care strategy. at our institution, one hour of or time costs approximately $500, exclusive of supply and personnel ...

Since the onset of combat activity in Iraq and Afghanistan, there have been over 1100 major limb amputations among United States service members. With a sustained military presence in the Middle East, continued severe lower extremity trauma is inevitable. For this reason, combat surgeons must understand the various amputation levels as well as the anatomic and technical details that enable an o...