نشریه مطالعات در دنیای رنگ
سال سیزدهم شماره 4 (پیاپی 51، زمستان 1402)

Nowadays, the use of new lighting technologies has led to considering light color as one of the influential factors in urban space planning and design. Due to the extensive dimensions and the impact of light color on humans and the environment, various considerations must be considered when deciding and choosing light colors. In these environments, focusing solely on humans can have detrimental effects on the environment. This article analyses three scenarios for the Ferdous Garden to Tajrish axis, considering environmental preferences for color and expert considerations in choosing light colors. The results show that the best definition to obtain the best results for increasing the visual experience and non-visual factors is two different design scenarios for the early and late hours of the night. Finally, proposed steps for color selection based on environmental preferences and considerations are presented.

Consolidation is one of the most important processes for conservation and restoration, particularly for historical monuments. It is typically made of porous, heterogeneous, and complex materials such as stones, bricks, and mortars. The effectiveness of the consolidation process depends on various factors, including the inherent properties and degree of damage to the material, as well as the condition and method of application of the consolidating material. However, achieving sufficient penetration depth of the reinforcing material is a challenge and can negatively impact the efficiency and effectiveness of the used materials. This research investigates conventional methods for measuring the penetration depth of consolidating materials in porous substrates. This research investigates imaging and spectroscopy techniques for measuring the penetration depth of consolidating materials in porous substrates.

In new technology fields, organic light emitting diodes (OLED) and the optimization of its components are of great interest. Organometallic complexes contain heavy metals, leading to the mixing of single and triple manifolds and increasing emission efficiency. For OLEDs to be useful in display applications, true red, green, and blue emissions of sufficient luminous efficiencies and proper chromaticity are required. The transition metals used to prepare emitting organometallic complexes are iridium, platinum, osmium and zinc (II). The development of these compounds depends on substitutions and organic structural units that are used as ligands. The results show that platinum and iridium have the best performance in preparing luminous organometallic complexes. In this article, a review of the recent progress in the development of organometallic compounds used in organic light-emitting diodes is highlighted. The preparation of optimal structure to achieve color purity and the development of the application of organometallic compounds will also be investigated.

The ever-increasing human need for energy and the increase in the world's population have caused significant demand increases. This has created a global movement toward new energy sources, especially green energies with minimal negative environmental effects, with solar energy on top. On the other hand, an important requirement in the growth and consolidation of the position of solar cells is the reduction of the production cost of these cells and the increase in the speed of their production on a large scale, which can be achieved by using printing methods. The global energy crisis and its significance are first discussed in this study, after which the solutions are briefly discussed. Additionally, the different types of solar cells and their most recent advancements have been reviewed, and different printing techniques that may be exploited in each form of solar cell have been explained. Finally, the market forecasts for solar cells have been studied.

In recent years, the demand for good quality natural products and minimally processed products with high nutritional value has increased. One of the most important natural materials in demand is natural edible dye. Pulsed electric fields in food processing focus on two main areas: microbial inactivation and preservation of liquid foods and enhancing mass and tissue transfer in solids and liquids. The pulse process uses pulsed electric fields with high voltage, which are used quickly for the food between two electrodes. Due to the short duration of the pulses, a little heat is generated in the foodstuff. Thus, the nutrients, vitamins, texture and flavour, as well as the microstructure of the foodstuff, are better preserved than the samples that are subjected to the thermal process. Natural dyes are very sensitive to the processes applied in conventional extraction techniques, such as thermal, mechanical and chemical stresses. Pulsed electric field (PEF) technology is promising as a non-thermal alternative.

Although the high chemical activity of magnesium alloys has given these metals biodegradable properties and an important place as a sacrificial anode in protection issues, it has caused them to have important weaknesses in corrosion and wear resistance. Their use in industry should be limited. However, these weaknesses mostly interact with the material's surface and can be overcome using appropriate surface modification. Electrochemical plasma oxidation (PEO) is a popular method to modify the surface of magnesium alloys, which creates a ceramic coating layer on the surface of the alloy, which is not perfect. The presence of a porous structure in this layer is its important weakness because it is a suitable path for the penetration of corrosive agents to the bare surface of the substrate. One of the attractive issues for researchers is to deal with this porosity by using appropriate ceramic additives in the electrolyte during the process. Zinc oxide nanoparticles are a good option for this. These nanoparticles are multifunctional, and in this article, their effects on corrosion properties and antibacterial properties are investigated