mohammad golmohammadi

A beautiful city is one of the main concerns of combining aesthetic and practical elements in urban planning, and making the city beautiful is a solution to beautify its residents. Since urban space is the result of citizens' interaction, the greatest pleasure of urban beauty can be found in good design and amenities. In addition to addressing the category of beauty, this article has tried to answer the question that to what extent the urban areas of Ardabil have been able to implement the indicators of urban beauty? The current research is descriptive-analytical in terms of method and practical in terms of purpose. The statistical population was the citizens of the urban areas of Ardabil, and using the Cochran sampling formula, the number of 383 people was determined as the statistical sample size by stratified random sampling. Sampling was done from five urban areas of Ardabil according to the population share of each urban area. The data was collected by two documentary and field methods, and finally, by using Excel software and through Vicor's analytical model, the data was analyzed, and in the research findings, it was determined that each of the urban areas of Ardabil in terms of The implementation of urban beauty indicators had different ratios and the average position of Ardabil city in terms of the degree of urban beauty indicators was estimated with Q 0.545, slightly lower than the average.

Using bolt shear connectors in Steel-Concrete-Steel (SCS) slabs is very important due to producing a complete steel plates connection and adjusting the sandwich thickness desirably. Therefore, in the present research, a numerical study is conducted on the flexural behavior of SCS sandwich slabs with stud-bolt shear connectors under the effect of the quasi-static concentrated load. For this purpose, first, the experimental specimens extracted from the previously published study were numerically modeled and quasi-statically analyzed using explicit dynamic analysis. Then based on the tests, the models were validated. Subsequently, the effect of the parameters, including the thickness of steel plates, stud-bolts diameter, the concrete core thickness, center-to-center distance of stud-bolt connectors, and the concrete core strength was evaluated based on the numerical models on the failure modes and the force-displacement curve. Finally, using the experimental setup and gene expression programming (GEP) algorithm, several numerical models were planned to predict the maximum strength of the slabs and a simple relation was proposed. The maximum strength resulting from the proposed relation and numerical models had an acceptable agreement with an error of 11% based on mean absolute percentage error (MAPE).

Determining the use of Internet of Things (IoT) in selected libraries

This survey used a researcher-made checklist. ؟ ؟experts confirmed the validity of the tool. Websites of twenty libraries as well as the literature about the use of the IoT by them were examined. Also we contacted with relevant people in the target libraries to receive additional data. Types of libraries, services provided by IoT technologies and tools were investigated.

The libraries benefited from 1) Radio wave identification technology (RFID); 2) Bluebeam technology; 3) Smart camera 4) Smart public areas project; 5) Hui Wen library information service system; 6) Montreal; 7) Book robot; 8) Smart robot; 9) Car to Car communication; 10) Capira mobile application is used to provide services. Bluebeam technology provided users with widest range of all the 10 services. Hui Wen's library information service system by benfiting from eight applications came top in using IoT.

The very fact that libraries studied continue to use IoT, may suggest that Iranian libraries should consider employing this emerging technology

Staggered truss system is one of the types of lateral bracing systems in steel structures. In this system, lateral forces are transmitted through the rigid floor diaphragm between adjacent trusses. The columns of the staggered truss system are placed only in the outer walls and the middle columns are removed. Hence, a large open space without columns is achievable, which is architecturally appropriate. In this paper, the effect of geometric characteristics of staggered truss systems such as the ratio of the opening length, the type and arrangement of the side trusses in seismic performance is investigated using ETABS software. For this purpose, the ability of the analytical model was first validated to estimate the available experimental results. It was observed that the analytical result is in good agreement with the results of the Experimental model. Then, by examining several different models, the effect of the length of the middle opening was investigated on the seismic parameters of the Staggered truss system. The results showed that the ratio of the length of the middle opening is very important in seismic performance; So that this ratio can have a direct effect on the ductility and stiffness of the structure. Finally, the effect of truss type used in side openings was evaluated on the best span ratio based on the best level of seismic performance. In this paper, three types of structures are used: short, medium and high.

Shape memory alloy (SMA) is a particular type of metal alloy that has the recovery property of permanent deformation. This alloy includes the typical properties of steel, such as resistance, hardness, performance, and so on. SMAs are used in some applications, including based-isolated buildings, self-repairing building components, aircraft industry, medical industry, mechanical equipment, and effective models for computing tools. In this paper, the effect of SMAs on the cyclic behavior of reinforced concrete (RC) joints is analytically investigated. To this end, after validation of two experimental models in Seismo Struct software, some parametric studies are conducted, such as 1- the effect of compressive strength of concrete, 2- the position of SMA into the plastic zone, 3- the simultaneous use of SMA as longitudinal bars and stirrup, and 4- the use of an equivalent column with a circular cross-section containing spirals or stirrups.

The present study was written with an applied-developmental goal according to the descriptive-analytical research method. After statistical and quantitative analysis to identify strategies, the qualitative method was used in accordance with the combination-chain method. Field studies were conducted with purposeful interviews, preparation of plans and imaging. The researcher-made questionnaire was sent to the statistical community in two stages. After collecting the questionnaires, using fuzzy Delphi technique, it was confirmed in two steps. Then, by modeling structural equations in SmartPLS software, the significance of the criteria was confirmed. Then, with BWM model, the criteria were ranked in SPSS and Matlab software. As a result, the security factor with a score of 0.436 was ranked first, the spatial privacy factor with a score of 0.321 was ranked second, and the existence of necessary facilities for social interactions with a score of 0.243 was ranked third.

Many factors, including cultural factors, currents and schools of thought, and patterns of urbanization in the world are influential in the physical structure of a city. The physical structure of the city is the result of all the forces that give rise to the formation and formation of a settlement and has an objective and mental appearance. The growth and development of cities, due to various events in all historical periods, has been declining and rising. Nowadays, knowledge of the physical structure of the city and the reasons that govern its spatial expansion in different periods is necessary to control its expansion and is one of the important factors influencing the success of urban planners and designers. This study was written with the aim of identifying and prioritizing cultural factors affecting the physical structure of the city with emphasis on indigenous architecture. The present research is applied in terms of purpose and descriptive-analytical in terms of method. Library and field methods were used to collect information. The statistical population of the study consisted of experts and specialists in architecture and urban planning, with a sample size of 30 people. In order to achieve the objectives of this study, the fuzzy Delphi technique and the BMW model were used. The results of fuzzy Delphi technique confirmed the identified factors and sub-factors. The results of the BMW model showed that among the identified factors, the privacy factor with a final score of 0.298 in the first place, the security quality factor with a final score of 0.273 in the second place, the nature connection factor and social interactions with a final score of 220 / 0 is in the third place and the hierarchical factor is in the fourth place with a final score of 0.209.

In addition to its positive effects on the economy of the city, the livelihood of the citizens, developing the micro businesses and improving the condition of the urban infrastructures, the urban tourism can play a major role as one of the municipal income resources in the economy of the city. To earn money in the municipalities is one of the things that has a major effect on providing services to the citizens. Municipality's more reliance on unsustainable income causes the city to confront with the basic problems in all its dimensions, including the urban body and landscape and, consequently, the reduction of the quality in the urban life will be seen. According to the surveys conducted by Sarakhs' municipality, it relies on the sources of the unsustainable income. Among the most important unsustainable sources of Sarakhs' municipality, the construction tolls and the illegal income such as the income from urban crimes, construction violations and the transfer of density surplus can be pointed, which a major share of municipal income is earned by this way. To make a sustainable income system, the use of the potential tourism capacities in Sarakhs can play a significant role in providing the sustainable income for the municipality. The method of the present research is descriptive-analytic and in this article, we try to offer some solutions in order to achieve the sustainable income of the municipality in addition to examine the capacities and the tourism potential capabilities in Sarakhs.

Steel-concrete-steel (SCS) sandwich panels are composed of two steel plates with low thicknesses and high densities and strengths and one thick layer between both plates with low strength and density known as core that is composed of concrete. Cohesive material-epoxy resin or shear connectors are usually applied in order to connect the plates to the concrete core. SCS sandwich composites are being developed so they can be utilized in offshore structures and buildings. Stud bolt is one of the shear connectors and their interlayer shear behavior is examined in the present study. In order to inspect the effect of parameters on interlayer shear behavior of steel-concrete-steel sandwich structure with stud bolt connectors, push-out test is performed under progressive loading. Pursuant to the tests performed, relations are proposed to predict ultimate shear strength and load-slip behavior of samples with stud bolt shear connectors. Consequently, numerical model of push-out test is presented on the basic component of Steel-Concrete-Steel sandwich structure (SCS) with stud bolt connectors. The results indicated that finite element model is consistent with test results applying mass scaling in Explicit Solver with a suitable analysis speed. Applying the regression analysis on the results of 80 numerical models of push-out test,a relation was proposed for shear strength of push-out samples with stud bolt connectors.

Cities are considered to be one of the most sensitive geographical areas due to demographic changes and land use, which, if these changes are not explored and foreseen by the authorities and municipalities, will cause irreparable financial and human damages to the citizens. The lack of planning in the field of urban development and determining the proper direction of growth of the city today has caused irreparable losses and costs, such as the expansion of cities such as Neishabur on the territory of Qanat. Ghannat is one of the oldest and most economical methods for extracting groundwater and is part of Iran's national heritage. But today, with the underground water level and the drying of the aqueducts, these underground channels have become a crisis in urban areas. Dozens of buildings are damaged in Iran annually due to its collapse caused by the canals of the Qanats. The present paper uses a field-analytical method and using documentary studies, using the AHP hierarchical process model and GIS software using various indicators and valuation of land subsidence criteria to study the areas at risk in Neyshabour city. Finally, there are also strategies and policies to prevent, plan and manage crisis management in the event of a risk.

Competitive location deals with the problem of locating facilities to provide the service to the customers where other competing facilities offering the same services. Many competitive location models are presented in the literature. However, the literature on competitive location considering reverse logistic in closed-loop supply chain is rather scarce. Also, there are two main approaches in the related literature; increasing profit, and increasing market share of the service centers. Most of the studies in the literature consider one of these issues as the objective function. But, in this study it is shown that these objectives may have conflict with each other. Therefore, addressing these issues simultaneously is important for a successful design of supply chain. This study addresses a novel bi-objective competitive facility location problem in a closed-loop supply chain in a manner that increasing profit and market share are considered simultaneously. On the other hand, in the real world, the customer may choose facilities that are not necessarily close to them, because of the greater attractiveness of other facilities. Hence, in this study, a new relationship is introduced to determine the attractiveness of each potential center for customers based on the distance and quality of service centers. To solve the proposed model and tackle the computational complexity of the proposed model, two approaches are developed: LP-metric and NSGAII. Furthermore, multiple numerical instances are defined and solved with exact approach of LP-metric through GAMS and the results are evaluated in order to validate the accuracy of the proposed model. The best value of “P” in LP-metric approach is also obtained via analyzing the results. Furthermore, the performance of the NSGAII is analyzed by comparing with exact solution of LP-metric through GAMS. The results indicate that the proposed NSGAII is more appropriate than LP-metric and consequently solving the large size problems through GAMS in a logical time is impossible.

Steel-concrete-steel sandwich panels are composed of two thin steel face plates and a thick concrete layer as core.
To provide external steel faces connection to concrete layer is used types of shear connectors.
This paper is focused on the interlayer shear behavior of the SCS sandwiches with high strength stud bolt shear connectors.
In order to investigate the effect of the geometric parameters on the shear behavior, push-out test under progressive loading is conducted. Variable Geometric parameters are included in thickness of the concrete core, steel plates thickness and diameter of the stud bolt.
For this purpose, exprimental samples prepared and investigated According to achieved results, the assessment of the ductility, failure modes, and ultimate shear strength is performed. Moreover, two relations are proposed for shear strength and load-slip behavior of stud bolt shear connectors. These formulas are compared with those of the earlier researches on the Bi-steel shear connectors.

Meatoplasty is the final and essential step in performing effective canal wall down surgery for chronic otitis media. In this article we review some previous techniques and discuss our preferred method.
In this observational case series study, we used this technique in 53 patients (28 male and 25 female) between January 2005 and January 2008. Our survey was completed in 31 patients.
Twenty-six patients (83.9%) said their ear appeared normal after the procedure, but five patients (16.1%) complained of some minor change in the shape of their ear. Twenty-nine patients (93.5%) had a completely wide ear canal. The ear canal had some degree of stenosis in two patients (6.5%) post-operatively.
This technique offers good functional and cosmetic results with minimal manipulation and minimal anatomic disruption.

In the present study, free vibration of a vibratory system equipped with an impact damper, which incorporates the Hertzian contact theory, is investigated. A nonlinear model of an impact damper is constructed using spring, mass and viscous damper. As a practical case study, a five-story building is simulated in SimMechanics toolbox of MATLAB software. Performance of the impact dampers to suppress structural vibrations of the structure is studied. It is shown that the impact dampers can effectively suppress undesired vibrations of all of the building floors.. For quenching vibrations,  in order to show the ability of impact dampers , the so-called "effectiveness" is introduced. Finally, it is shown that  the impact damper can increase the effectiveness up to 34 percents.