Khanqah of Sultan Ibrahim Khorrambid is a unique relic of the Timurid period. This building has exquisite stucco decorations, combined stone and tile decorations, and mosaic tiles. The building has a central domed chamber (gonbadkhaneh), the dome of which almost completely collapsed due to the earthquake and only a small part of it remains. Considering the climatic conditions, public expectations, and the need to preserve the decorative elements, reconstruction of the dome is deemed necessary. In the reconstruction of the dome, there are obstacles such as the weakness of the existing structure, the type of structure to be reconstructed, and the style of the dome. In this study, three methods for reconstructing the dome have been proposed: constructing the dome with bricks and implementing a wooden ring in the arch, implementing a combined metal and brick structure, and implementing the dome with a wooden structure. Considering that a small volume of the dome remains and on the other hand, preserving the decorations is important, implementing the dome with a light structure (the last case) is suggested.

 In this research, the chemical and antimicrobial analysis of the essential oil extracted from coal smoke was investigated. The operation of collecting wood vinegar by condensing the smoke exhaust gases resulting from pyrolysis of citrus and lemon trees in the coal production process in the north of the country was carried out in three stages. By performing the necessary chemical analyzes on these extractive materials, the presence of various organic compounds such as saturated and unsaturated hydrocarbons and aromatic compounds is visible. At the end, checking the anti-micron effects of these extracted substances with samples of fungi and bacteria available in the laboratory has been tested initially. The use of plant compounds, especially plant extracts, is one of the most promising alternatives to chemical pesticides. Plant extracts have a wide range of secondary metabolites that play an important role in plant-pest interactions. which due to its antimicrobial, antioxidant, anti-inflammatory and anti-cancer properties can be considered a suitable alternative in the field of agricultural food and medicine. They are produced from plant or microbial sources that have less risks for the environment and human health and can be used in two ways. The use of natural pesticides as an environmentally friendly approach in preserving cultural heritage can be considered as an innovation in this field. be considered Essential oils such as peppermint oil, rosemary oil and other oils with antimicrobial and sunscreen properties can be used to preserve cultural works against the growth of microbes and insect spawning. It is important that when using natural pesticides to preserve cultural works, it is important to be careful and know the characteristics of each substance and how to use them correctly to ensure of prevent any damage to cultural historical monuments. The wood species considered for the preparation of vinegar was lemon tree from the north of the country. The organic solvents used in the extraction process were dichloromethane, ethyl acetate, diethyl chloroform, and THF, which were obtained from the Indian company
Loba Chem. The devices used in this research are NMR, FTIRGC-Mass and TLC.
Microbial tests are performed with two types of strains. The fungus was Spexillus niger and Penicillium. In this experiment, the pyrolysis process of lemon tree wood has been tested in the coal production furnace in the north of the country. During the entire production process, a batch of production was carried out in a controlled manner. The wood was collected with three different cuts. The first cut was watery and transparent, which was not the target of the study. The middle cut was the target composition that was collected. It is mainly composed of organic materials and its investigation is not included in this project. The composition of the red colored liquid of the wood extracted from the middle section was transferred to the laboratory in the next step with organic solvents such as dichloromethane and other pairs of organic solvents into two phases. Aqueous and organic were purified and separated. After that each of the extracted phases have been subjected to necessary chemical and microbial analyses. The use of extractive materials of natural compounds is of particular importance due to its environmental friendliness. Essential oils and plant extracts can be used as natural and safe pesticides. Since ancient
times, producing charcoal from wood as a heat source has been a very common method. However, the extraction and burning of coal smoke has not been addressed until many applications of coal smoke have been reported in the present era. The use of essential oil from coal smoke in agricultural industries is also possible because it can be used as a fertilizer due to the rich source of organic carbon. However, in many articles, this essential oil has been mentioned as a control agent for biological and anti-fungal and bacterial agents. Based on this, the current research has been designed to extract aromatic and essential oils with a natural base, especially from waste materials such as charcoal smoke, which is a valuable branch in the direction of extracting and using biocompatible materials to control fungal and microbial factors in the field of heritage. Based on the investigations and the results of chemical and analytical analyzes as well as microbial tests, the targeted essential oil (from lemon tree charcoal) has aliphatic and aromatic compounds that are effective
in controlling microbial agents. The effectiveness of this test is different for different types of wood and different microbial strains. Depending on the concentration of the extracted smoke sample, different results will be output. It is likely that charcoal essential oil is more effective at higher concentrations and should be tested.

In this research, considering the necessity of conservation and restoration of wooden doors and their significance in Iranian architecture, as well as understanding the structure of historical wooden artifacts, necessary actions were taken to study, restore, and conserve a two-leaf wooden door belonging to the ivan of Sukiass house in Isfahan. Following preliminary damage assessment, various tests (including pH testing, colorimetry, equilibrium moisture content measurement, species identification, and Fourier-transform infrared spectroscopy) were conducted on the study sample. The results indicated the acidic nature of the structure of the sample under study, minimal color changes before and after the restoration process, standard equilibrium moisture content, the use of Oriental Plane tree wood (Platanus orientalis L) in the construction of the artifact, and the absence of significant structural damage on the sample surface. Historical wooden artifacts are typically classified into three main categories of physical, chemical, and biological damages. The study sample exhibited physical damages such as abrasion, cracking, and microcracks, environmental temperature effects resulting in color changes on the artifact,s surface, as well as the impacts of dust and debris. In the chemical damage category, tissue acidification in the artifact was observed, along with noticeable impacts of pollution. Biological damages caused by insect infestations, categorized under wood biological damages, were visible as multiple
boreholes on the artifact,s surface. Additionally, the presence of a burnt section at the lower part of one of the door leaves is another damage incurred by the study artifact. In line with conservation and aesthetic principles, necessary measures include cleaning the door and its frame, addressing deficiencies and cracks, protecting the artifact from pests, and applying polish and acid treatment.