in this paper, a novel mathematical model for a preemption multi-mode multi-objective resource-constrained project scheduling problem with distinct due dates and positive and negative cash flows is presented. although optimization of bi-objective problems with due dates is an essential feature of real projects, little effort has been made in studying the p-mmrcpsp while due dates are included i...

Obvious differences exist in the daily activity patterns of the LEW/Ztm and ACI/Ztm inbred strains of Laboratory rats. The inbred strain ACII Ztm shows a clear 24-h rhythm of locomotor activity. The activity pattern of the LEW/Ztm strain, however, is characterized by ultradian rhythms of 4and 4.8-h periods. Genetic analysis of crosses between the two strains was used to examine the relative amo...

a series of curcumin derivatives containing heterocyclic moiety have been synthesized and evaluated for their antibacterial activities. the chemical structures of the synthesized compounds were verified on the basis of spectral data and elemental analyses. investigation of antimicrobial activity of the derivatives demonstrated the ability to inhibit gram-positive microorganisms with zone of inh...

Collaborative practices that bring researchers and community participants together are favored by a social constructionist meta-theory. Specific features of research activity in the human sciences are discussed relevant to the contributions of theory to collaborative practice. It is argued that collaborative practice consists of alternating movements between two modes of action. In the first mo...

Today, in large projects such as constructing oil, gas and petrochemical refineries, it is inevitable to use modern management methods and project timing. On the other hand, in classic scheduling case, the focus is on balance between time and cost of carrying out projects, which in such a situation, one of possible solutions to shorten time of implementing project is to accelerate activities. T...

In this paper we present a new transistor sizing methodology called Free Power Recovery (FPR) for low power circuit design. The objective of this methodology is to minimize the total power of a circuit by accounting for node switching activities and leakage duty cycles (LDC). The methodology has been incorporated into the EinsTuner circuit tuning tool. EinsTuner automates the tuning process usi...

Interaction plays an important role to the success of distance learning. As most distance learning environments utilize mainly asynchronous ComputerMediated Communication (CMC) systems, interaction research that focuses on synchronous CMC is largely ignored. This study scrutinize the patterns of learnerlearner interaction in a distance-learning environment. Student interactions in synchronous a...

In this work, the effect of finishing diet (pasture- or mixed-diet) on lipid and protein oxidation in beef homogenates was evaluated. Oxidation was chemically induced by ferrous iron and hydrogen peroxide. Lipid and protein oxidation were respectively measured by determining TBA reactive substances (TBA-RS) and protein carbonyl groups (DNPH coupling method). Evaluation of the antioxidant status...