Azarbaijan Shahid Madani University

About: Azarbaijan Shahid Madani University is a education organization based out in Tabriz, Iran. It is known for research contribution in the topics: Graphene & Nanocomposite. The organization has 1477 authors who have published 3186 publications receiving 30278 citations. The organization is also known as: Azarbaijan University.

Probabilistic optimal power dispatch in multi-microgrids using heuristic algorithms

Abstract: Future distribution networks consist of some Micro grids (MGs) or Small Scale Energy Zones (SSEZs). In this paper the economic operation of SSEZs is formulated and solved as an optimization problem. A probabilistic model for Small Scale Energy Resources (SSERs) and load demand is used at each SSEZs to determine the optimal scheduling of microgrids with minimum operating cost. The power transaction between MGs and between MGs and the main is regulated based on the total operating cost and regarding the sold or purchase power either by microgrids or by main grid. The stochastically analysis of generated power with SSERs and their corresponding costs is determined considering optimization constraints and explained as PDF and CDF. The Imperialist Competitive Algorithm (ICA) and Particle Swarm Optimization (PSO) algorithm are applied to comparative study of the results as optimization algorithms. Based on the results, it is possible to determine the power demand and transaction between each SSEZs and the main grid. Besides, the results confirm that the power sharing between microgrids and main grid can decrease the operating cost of the smart distribution grids.

Investigation of pH-sensitive galactopyranoside glycol hydrogels as effective vehicles for oral drug delivery

Abstract: High-loading-capacity pH-sensitive glycol hydrogels were developed using allyl α-D-galactopyranoside as a biodegradable and biocompatible carbohydrate. These new pH-sensitive glycol polymers were obtained through the free-radical polymerization of methacrylic acid and allyl α-D-galactopyranoside using 1,6-hexanediol diacrylate and 1,6-hexanediol propoxylate diacrylate as crosslinker. The novel sugar-bearing galactopyranoside-based hydrogels were analyzed to test their hydrolytic behavior in vitro, considering their potential application as drug delivery systems. Equilibrium swelling studies were carried out in enzyme-free simulated gastric and intestinal fluids (SGF and SIF; pH 8 and pH 1, respectively). A model drug, olsalazine (an azo derivative of 5-aminosalicylic acid), was entrapped in these gels, and their in vitro release profiles were established separately in SGF and SIF at 37 °C. The swelling and drug release profiles revealed that the amount of drug released and swelling of the hydrogels depended on the methacrylic acid content and the crosslinker type and content.

Independent Double Roman Domination in Graphs

Abstract: For a graph $$G = (V, E)$$, a double Roman dominating function (DRDF) on G is a function $$f : V \rightarrow \{0, 1, 2, 3\}$$ having the property that if $$f(v) = 0$$, then vertex v has at least two neighbors assigned 2 under f or one neighbor w with $$f(w)=3$$, and if $$f(v)=1$$, then vertex v has at least one neighbor w with $$f(w)\ge 2$$. A DRDF f is called an independent double Roman dominating function (IDRDF) if the set of vertices with positive weight is independent. The weight of an IDRDF is the sum $$f (V) =\sum _{v\in V} f (v)$$. The independent double Roman domination number $$i_{dR}(G)$$ is the minimum weight of an IDRDF on G. In this paper, we initiate the study of independent double Roman domination. We first show that the decision problem associated with $$i_{dR}(G)$$ is NP-complete for bipartite graphs and then we present some sharp bounds on the independent double Roman domination number.

Bioactivity and Antibacterial Behaviors of Nanostructured Lithium-Doped Hydroxyapatite for Bone Scaffold Application.

Abstract: The material for bone scaffold replacement should be biocompatible and antibacterial to prevent scaffold-associated infection. We biofunctionalized the hydroxyapatite (HA) properties by doping it with lithium (Li). The HA and 4 Li-doped HA (0.5, 1.0, 2.0, 4.0 wt.%) samples were investigated to find the most suitable Li content for both aspects. The synthesized nanoparticles, by the mechanical alloying method, were cold-pressed uniaxially and then sintered for 2 h at 1250 °C. Characterization using field-emission scanning electron microscopy (FE-SEM) revealed particle sizes in the range of 60 to 120 nm. The XRD analysis proved the formation of HA and Li-doped HA nanoparticles with crystal sizes ranging from 59 to 89 nm. The bioactivity of samples was investigated in simulated body fluid (SBF), and the growth of apatite formed on surfaces was evaluated using SEM and EDS. Cellular behavior was estimated by MG63 osteoblast-like cells. The results of apatite growth and cell analysis showed that 1.0 wt.% Li doping was optimal to maximize the bioactivity of HA. Antibacterial characteristics against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were performed by colony-forming unit (CFU) tests. The results showed that Li in the structure of HA increases its antibacterial properties. HA biofunctionalized by Li doping can be considered a suitable option for the fabrication of bone scaffolds due to its antibacterial and unique bioactivity properties.