جستجوی مقالات مرتبط با کلیدواژه « standards » در نشریات گروه « علوم پایه »

Iodine is one of the most important essential micronutrients throughout life. Salt is the most important and inexpensive iodized foods in Iran. This study aims to investigate the concentration of iodine of salt in Gorgan and compare it with standards. This study was descriptive-analytical. The sampling was performed on 11 brands of iodized salt in Gorgan,s stores. The iodine content was measured by titration with three replications. The data were analyzed using SPSS software. In this study, the lowest average iodine concentration was observed in the K brand (15.05 µg/g). It did not meet the Ministry of Health standards (30-60 µg/g and 20-50µg/g). It met the WHO, UNICEF, ICCDD standards(15-55µg/g). Also, the brand of J (21.68 µg/g), F (24.62 µg/g), I (28.23 µg/g), and E (23.62 µg/g) did not meet the new standards of the Ministry of Health. The amount of iodine in the salt can be due to its quality in the production stage (e.g. purity) and the time interval from production to consumption. Therefore, continuous monitoring is very important in the chain of production and distribution timely.

Prior to any planning for the development of urban green spaces, standards for green space development should be identified. From the very important principles of urban planning knowledge, it is necessary to address users in terms of standards and per capita and locate them. Air, sound and visual pollution is caused by urbanization that nowaday human societies are facing. Therefore, considering the green space use as an air styler and space organizer, is necessary to achieve the ecological efficiency of cities. The purpose of this study is to identify the criteria location and green spaces planning, that it is the achievement of providing solutions for operating the general principles of green space development, so that it can be generalized to similar cases.

The present study is a fundamental-applied research method and a descriptive-analytical study. To collect the data, Libraries and documents Sources was utilized. Data analysis was mainly based on qualitative analysis method and also using ARC / GIS software.

Findings of this study show that none of the per capita in Tabriz city are in accordance with the standards of urban planning and environmental point of view. From the urban planning point of view, in the plan comprehensive, per capita of about 15 m2 is proposed for each person, this per capita in the current situation for Tabriz is equal to 1/69 m2. From the environmental point of view, in the plan comprehensive, is between 15-50 m2 per person while per capita city in the current situation is equal to 11.69 m2. Discussion and

The results of the study show that in the city of Tabriz, the criteria and development principles green spaces planning and their location criteria, including per capita in neighborhoods, environmental and ecological criteria, and spatial metrics such as centrality, hierarchy, and access has not been regarded. Therefore, the status of the green spaces use in the present situation of Tabriz city do not match with the proposals of the comprehensive and details plan, and with national and international standards. Moreover, the lack of optimal distribution in the city is quite evident. Therefore, the calculation of the appropriate level of green space and its balanced distribution in the city is the key issue, so that the process of achieving the ecological efficiency of the city is possible.