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Publicatii proprii
A sequence attached to powerful numbers
For every powerful number $k$, let $c_k$ be the least positive integer such that $kc_k$ is a square. We give asymptotic estimations for several series whose terms depend on the sequence $(c_k)_{kgeq 1}$, from which we mention $sumlimits_{kleq x} c_k=frac{3}{pi^2}zetaleft(frac{4}{3} ight)sqrt[3]{x^2}+O(sqrt{x}ln x)$.
Read moreKinetic Study of Sodium Diclofenac under Isothermal Conditions
The application of thermal methods is of great importance regarding the pharmaceutical problems such as the control of raw materials, the determination of purity, the qualitative and quantitative analysis of drug formulation, tests of thermal stability and compatibility, the determination of kinetic parameters etc. The purpose of a kinetic investigation is to calculate the kinetic parameters and kinetic model for the studied process. The results
Read moreProperties of a sequence generated by positive integers
For every positive integer $m$ let $b_m$ be the least positive integer such that $mb_m$ is a square. We show that $limsuplimits_{n ightarrow infty}(b_{n+1}-b_n)=+infty$, $liminflimits_{n ightarrowinfty}(b_{n+1}-b_n)=-infty$ and $sumlimits_{i=1}^nfrac{1}{b_i}=sqrt{n}frac{zeta(3/2)}{zeta(3)}+O(ln n)$.
Read moreInclusion Compounds of Erythromycin with β-cyclodextrin
In this paper is presented the synthesis of the inclusion complexes of erytromycin with β-cyclodextrin by three methods: kneading, co-precipitation and freeze drying and their characterization. The inclusion compounds were synthesized using a molar ratio of erythromycin: β-cyclodextrin of 1:1. Synthesized compounds were analyzed by FTIR spectroscopy, X-rays, differential scanning calorimetry and the results confirm the formation of inclusion compounds
Read moreMetals determination by microwave digestion ICP-OES of some supplements
ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry) analysis was applied to assess element concentrations in six samples of mineral supplements/multivitamins acquired in pharmacies from Romania. Concentrations of Fe, Ca, Mg, Zn, Li, Ba, Sr, Ni, Cu, Sn, Al, Co, Cr, Mn, Mo, Se, K, Na, Cd, Pb were determined. The digestion method with acid mixture (HNO3 an H2O2) was used to destroy the organic material. Generally, the Ca, Fe, K and Mg
Read moreA Multi-Agent Computational Model of Trade
In this paper we describe how you can implement a multi-agent computational model of trade using NetLogo. We did a number of 12 computer experiments. The first five experiments are dealing with the case when resources are renewable and trade is opened. The next five computer experiments are dealing with the case when resources are renewable and trade is closed. The last two computer experiments are dealing with the case when resources are non-renewable.
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