13 research outputs found
The Prognosis of the Phase Equilibrium Diagram of the System Al-Cu-Si
The paper presents a model for establishing the mathematical functions of the liquidus and solidus curves, from the binary diagrams Al-Si, Si-Cu, Cu-Al and their use in the prognosis of the phase equilibrium diagram from the ternary system Al-Cu-Si. We have studied the model of the non-ideal liquid solution of the regular type. The calculus and graphic plotting of the equations for the binary systems has been performed on the compute
Planning and Computerised Monitoring of an Experiment of Thermal Analysis of the Alloys in the Al-Cu-Si System
The paper presents an installation conceived for the automatic
registration of the temperature in the thermal analysis, at the
industrial and laboratory level, with application to the system of
non-ferrous alloys Al-Cu-Si. The experiment performed on the
above installation is compared to processes monitored through
simulation with specialised software
The Establishment, Plotting and Statistic– Mathematical Interpretation of the Liquidus Surface from the Phase Equilibrium Diagram of the Ternary System Al-Cu-Si
The paper forwards the conclusions of a survey performed on a
mathematical model of the phase equilibrium from the ternary system
Al-Cu-Si. The author presents the calculus of the statistic equation of
the liquidus surface model from this diagram, the plotting and
statistical-mathematical interpretation of the results obtained
Bioactive Molecules Profile from Natural Compounds
Currently, wide world research is focused on sustainable development and the demand for innovative clean technologies, nevertheless natural potential reconsideration could represent a viable solution for the identification and design of new pharmacological agents from renewable resources. The main reason consists of special properties of these natural derivates: immunomodulating activity with continuously perfectible selectivity and efficiency. Plants and herb extracts have been used for centuries as traditional medicines, throughout the entire world. Romanian phytotherapy represents practically a very important part of our traditional knowledge and heritage. Therapeutic properties of plant active principles still continue to be the subject of many researches. In this chapter, an overview of plant bioactive molecules from the perspective of modern phytochemistry is presented. A special part is devoted to a very special medicinal plant, Viscum album, in particular identification of amino acids and thionins from mistletoe
Therapeutic Use of Some Romanian Medicinal Plants
Romanian traditional medicine has an extremely old history. The Dacian knowledge of the curative properties of medicinal plants was documented by Herodotus, Hippocrates, Galen, and Dioscorides. It must be emphasized that modern chemical screening has confirmed the therapeutic properties of the medicinal plants used by the Dacians. More interesting is that Dacians used many of these herbs for different dishes. Practically, for Dacians, food was medicine. Recent research on some Romanian medicinal plants has highlighted their pharmacognostical importance. It is known that currently, the importance and dynamics of the research on medicinal plants in the area of drug discovery continues to increase worldwide. The main reason is not only the high efficiency of secondary metabolites in case of serious diseases (cancer, viral infections, malaria, etc.) but also the minimization of the side effects of the synthetic drugs
The Computerised Calculus in the Prognosis of the Phase Equilibrium Diagram of the Ternary System Al-Cu-Si
The paper presents a model for establishing the mathematical functions of
the liquidus and solidus curves, from the binary diagrams Al-Si, Si-Cu, Cu-Al and
their use in the prognosis of the phase equilibrium diagram from the ternary
system Al-Cu-Si. We have studied the model of the non-ideal liquid solution of the
regular type. The calculus and graphic plotting of the equations for the binary
systems has been performed on the computer with the software programmes
MathCad 2000 Professional, Statistica 5, Curve Expert, and for the ternary system
Al-Cu-Si, with the 3D StudioMax softwar
Chemical and Electrochemical Metallic Covering of ABS polymers
The aim of this paper is the deposition of metallic layers on the surface
of ABS plastic material, by means of two consecutive procedures,
namely: the first is represented by the conductibility through chemical
or electro-chemical metallic covering of the polymeric support and the
second procedure is the electrodeposition of the metal through
galvanization. The chemical mehtod consists in the submission of ABS
polymers to some conductibility operations of the plastic material
surface through chemical copper plating (chemical roughing,
degreasing with ultra-sounds, chemical sensitivation, activation and
proper conductibility of the material surface). The electrochemical
deposition of nickel was made on the plastic material activated in the
mixture solution of graphite with potassium carbonate
Simple Synthesis Method for Alumina Nanoparticle
Globally, the human population steady increase, expansion of urban
areas, excessive industrialization including in agriculture, caused not
only decrease to depletion of non-renewable resources, a rapid
deterioration of the environment with negative impact on water quality,
soil productivity and of course quality of life in general. This paper aims
to prepare size controlled nanoparticles of aluminum oxide using a
simple synthesis method. The morphology and dimensions of
nanomaterial was investigated using modern analytical techniques:
SEM/EDAX and XRD spectroscopy