Design of alluvial canals by using regime equations has been a subject of research during recent decades. The underlying theory dictates that for a canal in regime, water discharge, sediment load, canal geometry and slope, as well as other flow variables should be in equilibrium. For the design of alluvial canals, a number of regime equations have been developed by investigators such as Lacey, Blench, Simons and Albertson, Parsa and Javan. In the present study, applicability of the above regime equations was investigated. Then based on field data modified equations were presented. Field data included the measurement of flow discharge, flow velocity, geometry of canal cross section and slope of water surface in 29 earthen canals. The sizes of bed and side materials of these canals were also measured. Comparison of different regime equations indicated that the equation by Parsa and Javan provided a better estimation of hydraulic parameters as compared with other equations, because in this equation, flow width and depth were related to slope as well as flow discharge. Since in Parsa and Javan equation water surface slope was an independent variable, their equation can be applied to a wide range of flow conditions. Since all other equations were developed using local data, they can provide good results, if used in similar conditions. Therefore, in Komfiroz area their use did not lead to suitable results. For the case of Simons and Albertson equations, they were comparable to Parsa and Javan results. This was due to fact that their equations did not include limitations as imposed by other investigators. Using slope as an independent variable can predict the equilibrium conditions with more accuracy.  

In this paper, the detector of a moving target in MIMO radar with widely separated antenna in the presence of the a-stable clutter is proposed. Due to the complexity of the unknown parameter estimation in the presence of the target, the Rao test is applied. The a-stable model is a general model that can be applied to different environments with appropriate selection of parameters. The problem with this model is inexistence of a closed form for the probability density function of the distribution. Fortunately, there are models that approximate the distribution by a closed form expression. In the present paper, mixing of Gaussian and Cauchy model is used for expressing clutter. Finally, the performance of the proposed detector is compared with the optimal Gaussian and MiniMax detector by a graph of the probability of detection versus signal-to-clutter ratio. The simulation results, show that the performance of the proposed detector is better than the optimal Gaussian and MiniMax detector.

The main objective of this research was to find the stable side slope of irrigation canals, considering type of subgrade materials as well as canal depth. For this purpose two methods of limit equilibrium and finite element methods were used for stability analysis. In respect to the geotechnical properties of subgrade materials, the Unified Soil Classification System as well as the technical properties of each soil group such as cohesion, angle of internal friction and unit weight was used based on the recommendations given in the literature. To consider operation conditions, three cases namely: steady seepage, rapid drawdown and end of construction of canal were taken in to consideration. The results of investigation showed that stability of side slopes in canals is a function of type of subgrade material in respect to its cohesiveness, operation conditions and depth. In non-cohesive materials, the safety factor is not related to the canal depth and is normally less. Based on the mentioned functions safety factor of side slopes of canals with depth up to 8 meters were calculated. For non-cohesive soils stable slopes were about 1:0.6 and for cohesive soils it was determinate around 1:3.

In recent decades, various formulas have been developed to achieve a better evaluation of the characteristics of rivers and natural channels. In this article we compare some of well-known classical methods in estimating stable sections are compared. Also two non-linear functions have been used to design the width and depth of canals and sand bed rivers with the formulations which have been obtained from 70 natural canals in North-America. Genetic Programming (GP) and Group Method of Data Handling (GMDH), two methods in soft computing family, have been used in this research.Finally these methods have been compared with three general methods in designing stable canals. In this modeling, in addition to flow parameters like discharge (Q), sediment quality as average bed particles diameters (D50), and channel slope (S) have been used. The results show that GMDH is more accurate than other methods. Finally sensitivity analysis has shown the effect of each parameter used in the best model.

Purpose: Recognizing canal configuration is necessary for a correct endodontic therapy; and having no information about canal configuration causes failure in therapy. Since one of the most effective factors in canal configuration is race' we decided to have a laboratory and clinical research in Isfahan. The aim is to recognize canal configuration of the mandibular first premolar and compare the clinical and laboratory results.Methods & Materials: 1- Laboratory study (Invitro): At first we selected 127 mandibular first premolar' then we disinfected them in CLONA 5.25%. We made a correct access cavity on the teeth. In order to vacate pulp tissue in chamber and canals, we placed them in H2O2 35% for 15 days. Then we placed them in HNO3 5% for 3 days to be decalcified. Then we used 70%, 90%, 100% isopropyl alchole to dehidrate the teeth. After the above processes we injected India ink in -1.8 P, in canals and sealed access cavity by Zonaline cement, we used the teeth in Metyl Salicylate to make clear. Then, we studied canal configuration. 2- Clinical study (Invivo): In this study we selected 125 mandibular first premolar treated in post graduate and under graduate departments of Isfahan University school of Dentistry. Then we studied every radiograph using a negatoscope, and the data were analysed.Results: 1-Laboratory (invitro) results: Out of 112 mandibular first premolar (researchable), 75 type I (67%),5 type II (4.5%), 13 type III (11.6%), 16 type IV (14.2%) and 3 (2.7%) were out of Weine classification. 2-Clinical (invivo) results: Out of 125 mandibular first premolar, 103 type I (82.4%),3 type II (2.24%), 12 type III (9.66%), 5 type IV (4%) and 2 (1.66%) were out of Weine classification.Conclusion: The out coming results of this study are different from other researches. Perhaps the differences are caused by some factors such as race and method. Also the clinical results are too different from laboratory results which could be due to method. The laboratory study is more exact.

Purpose: The antibacterial activity of three endodontic sealers, a Ca (OH)2 based sealer (apexit) a Zoe based sealer (Drofill) and a resin based sealer (AH26) was assessed on the growth of an anaerobic bacteria (peprostreptococcus spp.) using the Agar diffusion test (ADT). Materials and Method: Thirty brain heart diffusion agar plates were incubated with peptostreptococcus anaerobics. Each plate was divided into two separate areas. In one area, 0.1ml droplet of a given fresh sealer and in the other area a dry material of the same sealer were placed, such that each plate had two areas with the same sealer in two forms of fresh and dry (setform). There were ten plates for each of the three sealers. The plates were placed into anaerobic jars and incubated at 37oC. After varying periods, zone of inhibition of bacterial growth were observed, measured and compared by t and Paired T-test.Results: There was no statistically significant differences between the activity of AH26 and drofill in the fresh form(P>0.05). However there were significant differences between (the two sealers in set form) (P<0.05) Drofill was more antibacterials in the set form than AH26. All sealers were more active when fresh than ages.Conclusion: It is likely that the eugenol in the Dorifill and the formaldehyde in the AH26 are responsible for their greater antimicrobial activity.