TRANSIENT VIBRATION ANALYSIS OF A TURNING MACHINE, S SPINDLE

Spindle is one of the most important member in turning machines, so that its precision determines the dimensional tolerances of machined parts. In this paper, the spindle’s response to standard input parameters has been analyzed via Finite Element Method (FEM).From this point of view, the spindle of LZ330VS turning type machine is modeled with Solid Works software. Then, the model is meshed via Msc-Patran software and analyzed by ANSYS. Four values which are the same for all inputs are applied to each one to study the affection of input parameters on the model, simultaneously. The results show that increasing in applied loads increases the oscillating dominations. The value of applied forces has also more affection than the applying time and input type on the oscillating dominations

Parametric optimization of daylight and thermal performance through louvers in hot and dry climate of Tehran

This article describes a parametric research simulated different louver conditions performance under given climate. The DIVA (Design, Iterate, Validate and Adapt) plug-in for Rhinoceros/Grasshopper software is used as the main tool, given its ability to effectively calculate daylight metrics (using the Radiance/Daysim engine) and energy consumption (using the EnergyPlus engine). The optimization process is carried out parametrically controlling the shadings’ geometries. Genetic Algorithms (GA) embedded in the evolutionary solver Octopus is adopted in order to achieve close to optimum results by controlling iteration parameters. The results of the paper show that there are meaningful optimum parameters which may help for better thermal performance through louvers in hot and dry climate of Tehran. The results indicate impressive efficiency in building industry in contemporary architecture of developing countries especially in Iran and west of Asia.Keywords: Daylight, Thermal, louver, Shading, Optimizatio

Analysis of Design Indicators of Sustainable Buildings with an Emphasis on Efficiency of Energy Consumption (Energy Efficiency)

Nowadays paying attention to sustainable development issues has been a priority for different countries, due to technological advances and increasing number of problems caused by neglecting the environment. Sustainable development is a new field that considers all the aspects of human life. One of important issues in this area is, considering the energy and efficient energy consumption and reducing the environmental consequences of its consumption. Sustainable design of buildings is also an example of sustainable development. The purpose of this study that has been conducted based on documents and library studies and analysis of samples that are built with the sustainable approach is to study and compare the fundamentals of investigated samples with the criteria of sustainable development. The result is that fundamentals of these buildings as architectural responses can help architectures challenges in different environmental conditions

Anatomical study of some Silene L. species of Lasiostemones Boiss. section in Iran

Silene (Caryophyllaceae) composed of 110 species in Iran from which 35 species are endemic. Lasiostemones section is one of Silene sections with 10 species in Iran. In present study leaf and stem anatomical structure were considered for the first time. In order to study the anatomical variations of stem and leaf, 36 populations of 7 species of Silene (Lasiostemonessection) were collected from different habitats of Iran. In leaf anatomy vascular bundle shape, shape of dorsal surface of mid vein, cortex diameter, hair presence in dorsal and ventral surface of leaf, mid rib diameter, cuticle upper and lower thickness, fiber presence in mid rib, stomata cell shape, stomata index and hair frequency show significant differences among studied species. In stem anatomy features as shape of cross section, hair type, cortex and xylem and phloem diameter were of diagnostic value in species separation

Thermal Behavior of Double Skin Buildings

Most energy losses will be made by skins, so offering optimized solution helps in energy saving. Glass as outdoor skin is considered the weakest part of building from energy loss viewpoint. Therefore a solution should be found to minimize energy losses in building meanwhile providing natural light. Double skin facades as a suitable solution for achieving this goal are considerable. Buildings with double skin façade can have better function than normal skin façade. So, this article is focused on thermal function of different forms of these buildings. This article by studying behavior of different forms intends to analyze the effect of general form of building on thermal function of double skin façade and attempt to categorized different situations so that recognize situations and conditions which may tangle classic behavior of double skin facades. Research method is quasi-experimental. Statistical population includes studying features of 10 building forms. The result of this analytical approach indicates classic function of double skins changes with change of general form of building. Keywords: energy saving, double skin facades, thermal behavior, building form

Daylight Parameters and Operation Quality Case Studies: Public Office Buildings in Kerman, Iran

Most of existing government office building in Iran were designed and built without enough consideration to the daylight design. Therefore a lot of electricity energy should be used to provide visual comfort in office rooms in government office buildings. Due to location of Kerman City of Iran, There are a lot of solar radiation in whole year during working hours in exterior spaces. In this research daylight quality of 4 office rooms in 2 government office buildings in Kerman city of Iran were investigated through experimental measurement and calculating some daylight parameters such as mean Work PlaneIlluminance (WPI), Work Plane Illuminance Ratio (WPI Ratio) and daylight Ratioin two conditions when lights were on and off. Finding of this research reveals that most of office building in government building cannot reach the acceptable range of different parameters of daylight even though lights were on. Therefore research about daylight quality in office rooms in this region is an important issue to be investigated to find different methods and solutions for improving daylight quality in office rooms. Keywords: Daylight Quality, Government Office buildings, Working Plane Illuminance, Working Plane Illuminance Ratio, Daylight Facto

Commercializing Usage of Nano-insulating Materials in Building Industry and Future Architecture

AbstractNowadays sustainable development plays a vital role in management. One of the basic policies in environmental sustainability is related to management of non-reproducible resource. One of the fundamental solutions to reach the sustainability is finding some ways to reduce the consumption of the fossil fuels.Since building industry plays a very significant role in the resource consumption, using the thermal insulation is one of these major solutions which can help us to construct buildings without consuming energy. Many different materials are designed for thermal insulation, like Nano-insulation, but most of them are not used in building industry. The most important questions about these kinds of materials are: what is the problem of using Nano-insulation and how can these materials be industrialized for the building industry? To answer these questions, after reviewing the current traditional thermal insulation materials and explaining the advantages of the Nano-insulation materials, a model of challenges of commercializing usage of Nano-insulating materials is presented. Studies illustrate that new Nano-materials should get through some specific processes in order to be guaranteed their usage in the building industry

Hepatotoxicity Among Poisoned Patients: A Cross-sectional Study

Background: Drug-induced liver injury is a major cause of hepatitis worldwide. In patients diagnosed with acute poisoning, drug-induced liver injury is a critical challenge. This study aims to evaluate the pattern of hepatotoxicity in poisoned patients admitted to Loghman Hakim Hospital.Methods: In this cross-sectional study that was conducted at Loghman Hakim hospital, the clinical records of poisoned patients were evaluated and patients with hepatotoxicity were selected for final analysis. The clinical and para-clinical information of these patients was recorded. The SPSS software, version 23. was used for statistical analysis.Results: A total of 260 cases were included in this study. The Mean±SD age of patients was 38.24±16.29 years and most of them were male (79.2%). Patients with narcotics poisoning had the highest prevalence (38.5%), especially when they were taken together with acetaminophen or benzodiazepine. In addition, among the patients studied, those with underlying cardiovascular disease are more likely to develop hepatotoxicity.Conclusion: In conclusion, among people with various types of poisoning, it seems that narcotics (opium, heroin, methadone, etc.), particularly when taken together with acetaminophen or benzodiazepines, cause hepatotoxicity and increase serum levels of liver aminotransferases. Also, in the study population, patients with underlying cardiovascular disease had a higher chance of liver injury. Therefore, clinicians are recommended to accurately monitor the sign and symptoms of hepatotoxicity in these populations