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تکرار جستجوی کلیدواژه texture در مقالات مجلات علمی
  • حسین نظم فر*، منیر شیرزاد گرجان، ابوالفضل قنبری

    تحلیل وضع سکونتگاهای غیر رسمی در رابطه با وقوع یک بحران محتمل، نقش بسزای در مدیریت صحیح در هنگام وقوع بحران خواهد داشت. بر این اساس در مطالعه جاری سعی شده است تا با استفاده از روش WASPAS تخمین مناسبی ازمیزان آسیب پذیری سکونتگاه های غیر رسمی شهر تبریز دربرابر زلزله به دست آید. شاخص های مورد استفاده در پژوهش شامل (مصالح ساختمانی، تعداد طبقات، کیفیت ابنیه، تراکم جمعیت، تراکم ساختمان، مساحت قطعات، عرض معبر، زمین شناسی، فاصله از گسل، فاصله از مراکز درمانی، فاصله از فضای باز عمومی، فاصله از تاسیسات شهری، نوع کاربری)می باشد. نتایج پژوهش بر آن دلالت دارد که 57.91 %از مساحت سکونتگاه های غیر رسمی شهر تبریز در معرض آسیب پذیری خیلی زیاد 05 .11 % در معرض آسیب پذیری زیاد و 03.27 % در معرض آسیب پذیری متوسط و فقط 4.01 % در معرض آسیب پذیری کم قرار دارد. همچنین نتایج محاسبات مدل WASPAS نشان می دهد که سکونتگاه های غیر رسمی واقع در منطقه 5 در صورت وقوع زلزله با کسب رتبه 1 از کمترین میزان آسیب پذیری برخوردار خواهد بود اما سکونتگاه های غیر رسمی منطقه 10 با کسب رتبه 6 بیشترین آسیب پذیری را خواهند داشت. سکونتگاه های غیر رسمی واقع در مناطق10 و1 در طیف آسیب پذیری خیلی زیاد قرار گرفته اند. بنابراین برای مقابله با هر گونه خطرات ناشی از این مخاطرات ساخت و ساز باید با رعایت آیین نامه 2800 زلزله صورت پذیرد. همچنین استفاده از مصالح مقاوم و با دوام همچون اسکلت فلزی و یا بتن آرمه باعث کاهش خطرات ناشی از لزلزله خواهد شد.

    کلید واژگان: سکونتگاه غیر رسمی، زلزله، ریسک، بافت، تبریز
    Hossein Nazmfar *, Monir Shirzad, Abolfazl Ghanbari
    Introduction

    Today global population growth has led to the rapid development of urbanization and the growth of informal settlements. These settlements are often developed in areas that are exposed to hazards such as earthquakes. Although technical models of earthquake management have been identified, but in third world countries due to social, economic and ... complexity, these measures are often associated with many problems (Smith et al. 2020: 67). Addressing vulnerability in informal settlements where severe natural disasters pose multiple risks to millions of people is critical. Understanding the effects of adjustment and adaptation strategies in the housing sector helps decision makers to choose options that improve the quality of life and reduce development and equality gaps in cities. Adaptation measures such as hazard mapping, development of early warning systems (EWS), preparedness plans and preventive risk strategies, especially in informal settlements, can support decision makers and stakeholders in reducing exposure and vulnerability to potential earthquakes. Kend (2018, Emma Purio et al) Catastrophic natural hazards, such as earthquakes, are serious threats to human life in informal settlements. Therefore, assessing the degree of probability and vulnerability in disaster management is necessary in order to manage the city and help decision makers to recognize the impact of various factors and understand the deficiencies in each area, appropriate guides are necessary. The critical condition of buildings and their zoning in terms of vulnerability should be included in government observations and risk reduction programs should be improved. The lack of distribution of suitable space inside the city and improper planning of urban development can be dangerous factors in the future (2020, Ratiranjan et al).

    Methodology

    The method of this research is descriptive-analytical and its purpose is applied. The data used in the research are: statistical block, geological map, topographic map of 1.25000, digital elevation points of ten meters, fault map of the area, land use map of the studied area and field studies. Also with the aim of determining the vulnerability of informal settlements in Tabriz due to earthquake risk indicators (width of passage, quality of buildings, material, number of floors, distance from public open space, distance from urban facilities, distance from medical centers Population density, building density, distance from the fault, geological type, plot area, land use) were selected as the final criteria according to the possibility of data access. Also, in order to analyze the data, GIS ARC software and WASPAS model, which is one of the newest and most efficient ranking methods, have been used.WASPAS technique: The Vaspas technique was announced by Zavadskas in 2012 (Zavadskas, 2012). This method is one of the relatively new methods of multi-criteria decision making with very high accuracy, which is actually derived from two models (total weight model) and (weight multiplication model) (Zavadskas, 2012). The calculation steps of the mentioned method are as follows:Forming a decision array according to the current situation. Calibrate and deregulate the decision array. Calculate the weight of each criterion using one of the weighting methods such as Shannon entropy, AHP or ANP Estimation of veriəns values of standardized criteria. Calculate the relative veriəns of the samples and determine the values of the eigenvectors.Perform the final ranking.

    Results and discussion

    In order to form a matrix (options and criteria) in the WASPAS technique, the options must be specified. Therefore, the areas where the informal settlements of Tabriz are located were considered as WASPAS model options. (Option 1 includes informal settlements in Zone 1, option 2 includes informal settlements in Zone 3, option 3 includes informal settlements in Zone 4, option 4 includes informal settlements in Zone 5, option 5 includes informal settlements Located in Area 7, Option 6 includes informal settlements located in Area 10). In the next step, the values of each criterion for each option were determined. Finally, based on the mentioned relations for WASPAS technique, calculations were performed in MATLAB software environment, the results of the mentioned model are presented in Table 2.The weights assigned to each of the criteria are normalized and are presented in Table 2. According to the table above, informal settlements in District 10 are ranked first in terms of vulnerability, and settlements in District 5 are ranked 6th. Therefore, according to the results of the table above, the most vulnerable informal settlements belong to District 10. In the next step, the changes in the weights measured according to the research technique were analyzed on each of the research indicators. Therefore, all research indicators were extracted in terms of vulnerability and maps related to each of the parameters were produced (Figure 2).

    Conclusion

    Analyzing the situation of informal settlements in Tabriz in the face of a possible crisis will play an important role in proper management during a crisis. Due to the fact that there is a large fault area in the city of Tabriz. Therefore, its informal settlements are always at risk of earthquakes. substandard materials, etc. in the event of an earthquake, the effects of the disaster will be irreparable. As a result, determining the vulnerability of informal settlements in Tabriz to earthquakes is of great importance. Which will play a very important role both in terms of planning for resilience and in terms of crisis management and providing emergency accommodation. The findings of the present study indicate that the WASPAS model and its integration with GIS can integrate layers with different structures. Accordingly, in this study, data analysis was performed using WASPAS and GIS techniques. The results of the WASPAS technique indicate that informal settlements in District 5 will have the lowest vulnerability in the event of an earthquake with a rank of 1, but informal settlements in District 10 with a rank of 6 will have the highest vulnerability. Also, more than 57% of the area of informal settlements in Tabriz is exposed to very high vulnerability and 11.05% is exposed to high vulnerability and 03.27% is exposed to moderate vulnerability and only 4.01% of the informal settlements in Tabriz They are at low vulnerability. Also in terms of vulnerability spectrum of informal settlements located in zones 10 and 1 in the very high range, informal settlements located in zone 7 in the high to medium range, then informal settlements located in zone 3 in the medium range And informal settlements in zone 4 are in the medium to low range and informal settlements in zone 5 are in the low to medium range of vulnerabilities. Due to the location of the study area in the zone with high earthquake risk, to deal with any hazards caused by these hazards, construction must be done in accordance with the 2800 earthquake regulations. Also, the use of durable materials such as steel frame or reinforced concrete will reduce the risks of earthquakes.

    Keywords: Informal Settlement, earthquake, risk, Texture, Tabriz
  • Neda Chenani Saleh, Sayed AmirHossein Goli, Maryam Haghighi*, Javad Keramat

    By changing lifestyle recently many consumers prefer to use processed and ready food like frozen vegetables because of the fastest and easiest way. For this reason, a factorial experiment based on RCBD was designed with 3 replicates to investigate the effect of blanching and freezing method over time on frozen cabbage. Treatments including 2 blanching boil water (Bb) and steam (Bs) and freezing methods home frozen (Fh) and semi-commercial frozen (Fs) and finally packed and kept in the freezer for 6 months. The results showed that the main effect of blanching exhibited that vitamin C decreased in Bs, phenolic compound and antioxidant increased in Bs. The main effect of blanching, freezing and storage time showed that texture, decreased with Bs and Fs significantly and storage time did not affect the texture. Vitamin C, the phenolic compound, and antioxidant decreased in all storage time and freezing method did not affect them. The interactive effect revealed that cabbage quality in chemicals, antioxidant, texture, and nutrient value decreased over time, especially, after 2-month storage in all freezing and blanching method. This reduction can be prevented by proper blanching and freezing method, but it plays different roles for various parameters.

    Keywords: Antioxidant, Nutritional value, Vitamin C, Texture, phenolic compound
  • Maryam Ravanbakhsh, Shiva Azizinia *, Mahmoud Lotfi
    Fresh fruit consumption of cucumber reqired developing and breeding new cultivars bearing high fruit quality in terms of shape, flavor and taste along with storage quality to meet market demands. In order to determine and evaluate fresh cucumber quality related traits a study was conducted using randomized complete block design with three replications. 27 cucumber genotypes including seven greenhous hybrids, five opendoor hybrids, three elite lines and 12 Iranaian local gernpelasm were selected. Some quality related characters such as size, firmness and other texture mechanical properties, dry matter content, potassium content, sugar content etc. were measured. Effects of each genotype on measured characters were significant except for fruit weight, thoughness, dry matter and ash content. Deltagreen hybrid was rated as the best score for the quality of flavor and texture. Principal components analysis showed that eithty percent of the observred variability was explaimed by the first four components. PC1 reperesented mainly mechanical properties; PC2 explains chemichal and physical properties; PC3 reperesemtes mainly physical properties. In sum based on the results of current experiment, the higher quality of flavor and texure were observed in genotypes with high ratio of fruit length to fruit diameter (L/D), low ratio of fruit diameter to pelacental diameter ratio (FD/PD), moderate content of potassium, polysaccharide and soluble sugars and low firmness.
    Keywords: Cucumber, Flavor, Principal components analysis, Texture
  • سید مهدی حسینی، بهاره شعبانپور، سید علی جعفرپور، علی شعبانی، سید یوسف پیغمبری
    تاثیر آنزیم ترنس گلوتامیناز میکروبی (MTGase) در مقادیر 6/0، 1، 4/1 و 8/1 واحد در هر گرم از گوشت چرخ شده ی میگوی خنجری(Parapenaeopsis stylifera) بر خصوصیات زل تولید شده از گوشت این میگو مورد بررسی قرار گرفت. اکثر پارامترهای نشان دهنده ی خصوصیات بافتی با اضافه کردن آنزیم MTGase نسبت به زل های شاهد تحت تاثیر قرار گرفته و میزان این تاثیر در مقادیر بالاتر این انزیم (8/1 و 4/1) از همه بیشتر بود. آنزیم MTGase میزان رطوبت تحت فشار و میزان پپتیدهای محلول در TCA را در ژل ها کاهش داده و بیشترین کاهش در ژل های با بیشترین میزان MTGaes دیده شد. انزیم MTGase مخصوصا در مقادیر بالاتر روی رنگ گوشت نیز تاثیرگذار بوده طوریکه میزان شاخص L را افزایش داده و از میزان شاخص های a و b کاست. الگوی الکتروفورز SDS-PAGE نشان داد که با افزایش میزان این آنزیم، از شدت و غلظت باند مربوط به زنجیره ی سنگین میوزین کاسته می شود. مقایسه ی عکس های میکروسکوپ الکترونی ژل های تولید شده حاوی بیشترین میزان آنزیم MTGase و ژل های شاهد نشان دادند که آنزیم MTGaes باعث شد تا به میزان رشته های نازک و طویل که در قسمت های مختلف دارای اتصالات عرضی هستند افزوده شود. بنابراین افزودن آنزیم MTGase می تواند نقش مهمی را در افزایش خصوصیات ژل حاصل از گوشت چرخ شده ی میگوی خنجری ایفا نماید.
    کلید واژگان: بافت، سنجی، هیدروفوبیک
    Seyyed Nasrollah Hosseini, Bahareh Shabanpour, S. J
    The properties of kiddi shrimp (Parapenaeopsis stylifera) gel added with different levels of microbial transglutaminase (MTGase) (0. 6، 1، 1. 4 and 1. 8 units/g) were studied. Most textural parameters of the gels improved by adding MTGase espacially in higher levels (1. 8 and 1. 4). The expressible moisture and trichloroacetic acid content declined with the increase in MTGase content. MTGase espacially in higher levels was effective in the color of the gels so that it increased L and decreased a and b. SDS-PAGE study revealed that myosin heavy chain enderwent polymerization to a higher extent in the presence of MTGase. Microstructure of gels added with 1. 8 units of MTGase had more ordered fibrillar structure compared with those of gels without MTGase. Therefore MTGase play an important role in improving the gel properties of kiddi shrimp mince.
    Keywords: texture, analysis, hydrophobic
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