Fire is one of the incorporate vegetation management practices for grasslands and semi-arid rangelands. It may affect symbiotic relationship between range plants and mycorrhiza. Accordingly, this research was aimed to investigate the effects of a spring prescribed fire on the symbiotic relationships between mycorrhiza and 6 plant species. The study was conducted in a semi-arid steppe rangeland called Dehbar, Torghabeh in Mashhad, Iran. A prescribed fire was applied on 20th April 2015. Soil and plant samples were taken one month later. Colonisation and spore density were measured on the root of 6 different species. Spring fires significantly increased fungi spores in the rhizosphere of all plant species with the highest and lowest frequencies (42 and 24 per gram dry soil) obtained forPimpinella tragium and Artemisia aucheri, respectively. Fire effects on colonization varied from high to no effect ranges. The increases in the mycorrhiza propagules after a prescribed burning during the growth season might be due to a suddenincrease of nutrients from plant ashes. Although the studied plant species were different in terms of morphology (canopy and root type), phenology and life form (geophyte, perennial grasses and shrubs), the spring fire increased the colonization rate for plant species that had just started vegetative plant growth (Stipa barbata, Artemisia aucheri and Pimpinella tragium) but it had no effects regarding the plant species (Poa bulbosa, Agropyron trichophorumand Astragalus gossypinus) that were fully grown at the time of burning and/or had terminated seasonal growth period at the time of soil sampling. Therefore, in terms of plant-mycorrhizal symbiosis, a prescribed spring fire might increase the competitive advantage of perennial late season species as compared to annual early season species which are mostly ephemeral or invasive plants.

Invasive plant control is a significant challenge for natural resources management. Rosa persica (Michx ex. Juss. ) is one of the invasive species in Iran. It has been rapidly expanded to the areas where it has introduced. In the present study, we evaluated the effects of five treatments: 1) control, 2) fire, 3) cutting, 3) tilling, 4) chemical techniques (glyphsate application) in controlling the expansion of Rosa persica in a degraded rangeland plant community (Rosa persica dominant type) in Markazi province. An experiment was arranged in split plots based on a completely randomized block design with four replications for three consecutive years. We found that the combined methods have played a more effective roles in controlling the Rosa persica and among these methods; fire combined with chemical techniques appeared to be a better option for reducing the abundance of Rosa persica. Also, fire combined with the mechanical removal of the above-ground and fire combined with the mechanical removal of the root reduced population size of Rosa persica, as comapred with the control, however, no significant difference (P<0. 05) was found between the two methods. Thus, because of the disturbance in the soil, as a result of the mechanical removal of root, we recommend the use of fire combined with cutting instead of tilling to reduced Rosa persica.

Background and Objectives: Soil Water Repellency (SWR) is one of the dynamic soil characteristics that either reduce water penetration in the soil or prevent it. In the northern forest areas of Iran, fire is one of the most important environmental concerns and is one of the main causes of the change in soil water repellency phenomenon. Therefore, this study aims to investigate prescribed fire effect on the soil of forest areas of Toshen's watershed, temporal variability and its interaction with physical and chemical properties of soil in Golestan Province. Materials and Methods: Soil of forest areas in the slope class of 15-30% and depth of 0-5 cm of soil surface was studied in 30 replications in laboratory. Physical and chemical properties of soil, including percent of clay, silt and sand, soil organic matter, pH, EC and aggregate stability (MWD) were investigated before and after fire. In order to study the effects of fire on soil water repellency in laboratory conditions, prescribed fire was applied. SWR was determined with Water Drop Penetration Time and Molarity of an Ethanol Droplet tests, before and after fire. Results: According to the WDPT test, before the fire, 100% of plots were wettable (class 1), but one day after the fire, 100% of the plots were showed slightly water repellent (class 2 and 3). The MED test showed that all plots were wettable (class 0) before the fire. One day after the fire, the intensity of SWR increased, so that 30, 50 and 20% of the plots were slightly water repellent (class 1), moderately water repellent (class 2) and less strongly water repellent (class 3), respectively. Investigating the process of temporal variability of both SWR indices showed that the SWR class after the fire is temporary and up to one month after that, the SWR classes is greatly reduced. The results showed that there are good correlations between two post-fire hydrophobic tests. (R2=0. 85). There was a moderate correlation between two WDPT and MED SWR tests with pH, EC, MWD and soil organic matter, but as for soil texture components, there was poor correlation. Relatively poor SWR correlations with soil physical and chemical characteristics indicate that these changes are not likely to be the main cause of SWR changes. Some of these changes can be explained by the variability of aggregate stability after the fire. These changes in the mechanical stability of the soil structure can be caused by two main mechanisms: (1) Changes in the composition of the solid components in the soil that increase the cohesion forces between the particles in the aggregates. Consequently, the stability of the soil structure against the physically destructive forces increases. (2) Changes in the physicochemical properties of the soil solution (an increase in the EC) that prevent clay dispersion and microaggregate destruction (physicochemical mechanism). Conclusion: Finally, the results of this study showed that despite the high wettability in loess soils, fire can be an external factor that causes a weak and immediate increase in SWR. The slightly soil water repellent may be due to the following: (i) SWR often occur in coarse soils with high organic matter. (ii) The samples were taken from the soil surface layer (0-5 cm), while the fire can cause some organic matter to accumulate in the subsurface layers and cause SWR on lower horizons.

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.

Rosa persica Michx. ex Juss. is an aggressive plant species in Iranian rangelands. Several controlling methods have been suggested to stop its expansion. This study examined the short-term effects of fire, tilling, cutting, and herbicides as a means of controlling Rose persica on the richness, evenness and diversity of R. persica communities in rangelands of Iran. The experiment was arranged using asplit-plot design with fire (burning and control) as main plot and four treatments (cutting, tilling and glyphosate herbicide and control) as subplots based on a completely randomized block designwith four replications over three years (2013-2015) in khosbijan, Iran. The Margalef, Sheldon, and Shannon-Wiener indices were used to assess the species richness, evenness, and diversity, respectively. We found that treatments had a different effect on the plant community composition. Prescribed fire coupled with other treatments had a significant effect on species diversity rather than control (P<0. 01). This finding indicated the significant effect of prescribed fire on the plant diversity indices. Mean of diversity was higher in burning alone (3. 181). The highest value of evenness was related to the chemical treatment without fire (0. 582) and the highest richness was related to the control (11. 114). Also, the lowest values of diversity, evenness and species richness occurred by cutting without burning (2. 582), control area without applying other treatments (0. 258) and herbicide without burning (7. 921), respectively. Therefore, plant diversity was increased using each treatment. This may be due to reduction of R. persica frequency. Despite the increasing of species diversity after applying treatments, it should be acknowledged that due to lack of desirable species gene pools and colonization of ruderal species, the vegetation composition won't be necessarily desirable. Therefore, in R. persica communities, the restoration of these communities should be considered after the controlling of the R. persica.

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.

Sharia punishments were a title that in the past was considered a mystery in law; However, when the recent Islamic Penal Code, under the title of prescribed Sharia punishments, explicitly included it in the text of the law and imposed conditions on it, the nature of the definition and the determination of its instances became doubly important; An important matter that has not been addressed by the legislator and his assistants, nor by the few and limited efforts of the jurists, has reached a definite and consensus conclusion about its examples! This article is another attempt to find examples of this institution, which undertakes a more extensive exploration of the jurisprudential background of this discussion, carefully separates the limits and punishments, examines and categorizes different sayings in the number of limits, and tries to find examples of predestined punishments. Draw out from the opinions of the jurists. Finally, he takes a comparative look at the jurisprudence and the law of punishment and reaches different and astonishing conclusions about the examples of prescribed punishments in the Islamic Penal Code