The knowledge related to the methodology of the field trial study as a type of intervention studies, yet for many of our researchers is not fully understood. The aim of the current study was a better understanding of conducting this type of research. Field trial studies are done on healthy individuals and aim to prevent. These types of studies such as clinical trials are performed on both individual and collective levels. One type of these studies is Community Intervention Trial which is usually done on a large scale population. Field trial study should be carried out in stages, such as the formulation of hypotheses, selection of the population (reference population, study population, and sampling), measuring the baseline variables (before conducting preventive intervention), random allocation of subjects to intervention and control groups, doing interventions and measuring outcome. The methodology of field trial studies is very similar to clinical trials. The difference is that field trials are conducted on healthy individuals and aim to prevent and also the sample size required to this type of study is relatively more, and these studies are usually time consuming and costly.

In the Sassanid period, with the officialization of Zoroastrianism, fire temples appeared in the society as an obvious manifestation of religious rituals and customs. Since fire is a sacred element for Zoroastrians, it requires special conditions to maintain it, for this purpose, buildings called fire temple (four vaulted) have been built. Due to its special strategic location, Mazandaran province is one of the regions of Iran that prevented the Arabs from penetrating this region until the first two centuries of Islam. For this reason, Muslim historians and geographers have been silent about this region, and this caused our information about the monuments The religious people of this region are very few. The purpose of this research is to investigate the remaining works in Mazandaran, which according to historical texts were fire temples in the Sassanid period and then changed their use in the Islamic period, and also to introduce the fire temples that were discovered after archaeological excavations in this area; Therefore, along with documentary studies, field method has been used to record, record and explain the current state of the works and based on the descriptive-analytical method to recognize the works. The results of the research show that the works attributed to the fire temple in Mazandaran, which are mentioned as fire temple in historical texts, have no connection with the fire temple in terms of the type of plan and the date of construction, but a number of fire temples and the foundation of the fire temple were discovered in this area, which are with the places mentioned in the history texts. The mentioned are completely different in terms of geographical location and they are not mentioned in any historical source.

Memory resistor or memristor is already fabricated successfully using current nano dimension technology. Based on its unique hysteresis, the amount of resistance remains constant over time, controlled by the time, the amplitude, and the polarity of the applied voltage. The unique hysteretic current-voltage characteristic in the memristor causes this element to act as a non-volatile resistive memory, to store the information till the next perturbation. In this paper, a bridge consisting of four memristors is introduced as a synapse to connect the two neuron cells, leaky integrate-and-fire, and Hodgkin-Huxley neuron cells. The use of memristor bridge synapse in the proposed architecture solves one of the major problems, regarding nonvolatile weight storage in analog neural network implementations. By changing different values of each memristor, the synaptic weight will be programmable. The current-voltage characteristics and their weight variations will be examined in the behavior of neuron spikes.

Purpose: Clustering and co-word analysis is a method to reveal relationships and links and illustrate the intellectual structure of a scientific field. This research tries to study the intellectual structure of articles in the field of futures studies in Iran by using the technique of co-word analysis. Method: The current research is a descriptive-analytical development with a scientometric approach. The statistical population is 921 articles retrieved records in the field of futures studies. Findings: The findings showed that articles in the field of futures studies in Iran are often associated with positive growth, and in terms of frequency, the keywords scenario, Islamic Republic, and foresight are the most frequent in futures studies. The findings related to the hierarchical clustering led to the formation of 8 clusters in this field, namely "ICT visions", "geographers who love the future", "knowledge development", " Futuristic higher education", "Future of Religion", "Regional Relations", "Strategic Foresight" and "Heavy Weight of Method". Conclusion: According to the findings of the current research and the high frequency of the keyword scenario, as well as the density and relationships of this keyword with other keywords, it can be concluded that the scenario is the dominant approach in futures studies. Also, according to the resulting clusters, it was observed that these researches have a high variety, but addressing the future in many areas is still neglected.

In this Paper the formulation and properties of Fire-resistant coatings, which were made and tested ih the Building and Housing Research Center laboratories (BHRC), are reported. Different samples were produced from gypsum, perlite, LECA, blast furnace slag, pumice, and silica fume. In the absence of fire resistance test furnaces, the basic concepts related to fire resistance performance of materials have been used to plan the test setting and analyse the behaviour of formulated materials. Thermal properties of the samples were examined with the thermal analysis equipment, including DTA, TG and dilatometery methods. The effect of high temperatures on the behaviour of samples was also studied by means of laboratory furnaces. In. addition, the physical and mechanical properties of samples were tested and compared with standard specifications of plasters.

Prior reports have demonstrated that there is a rising trend in the number of fire death over the recent decades. This is mainly due to the quality and quantity of the fire gases that is associated with thematerials used for furnishing, decoration and construction. Reports have shown that combustion of different materials, especially the modernsynthetic materials, has released fire gases such as carbon dioxide, carbon monoxide, hydrogen cyanide, organic nitrites, carbonyls, alcohols, and other organic elements. The study of fire gases in fatal casualties and toxicological investigations of acute and chronic poisoning implies a branch of "toxicology" which is called "Fire Toxicology".

In order to study the effects of calcium and light duration on growth and quality of lettuce, this experiment was conducted as split plot based on the randomized complete design with three replications, in research greenhouse of University of Zanjan during 2020. The main plot consisted of light treatments at two levels included natural light duration (an average 7000-8000 lux) and natural light in addition four hourse complementary light (600 lux) and the subplot was consisted of three levels of calcium lactate (0. 5, 1 and 1. 5 g L-1(, calcium chlorid (3, 6 and 9 g L-1) and distilled water as a control. The results showed that increasing light duration significantly increased leaves number, plant fresh weight, total chlorophyll, phenols and flavonoids, vitamin C and anthocyanin contents. Application of calcium chlorid (6 and 9 g L-1) and calcium lactate (1. 5 g L-1 ( increased plant fresh weight (10. 3, 10. 5 and 11. 6 g) and Ca concentration of internal leaves (12. 8, 12. 9 and 12. 2%) lettuce, and inhibiet tip burn disorder in lettuce lives. The highest tip burn leaf number (3. 5) was observed in plants whitout Ca teated under complementary ligh treatment. Also the highest amount of plant fresh weight, anthocyanin, total phenol and flavonoids and antioxidant capacity was obtained by using calcium lactate 1. 5 and calcium chloride 3 and 6 g L-1 with increasing light duration. According to the results, application of calcium lactate 1. 5 g L-1 and calcium chlorid 6 and 9 g L-1 with increasing light duration can be preposed to improve growth and quality of lettuce.