فیلترها/جستجو در نتایج    

فیلترها

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بانک‌ها




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متن کامل


نویسندگان: 

LANZERSTORFER C.

اطلاعات دوره: 
  • سال: 

    2015
  • دوره: 

    12
  • شماره: 

    4
  • صفحات: 

    0-0
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    273
  • دانلود: 

    0
چکیده: 

Information on the size dependence of the concentration of pollutants in fine-grained residues is required for the design of classification processes for their processing. For such an analysis, the SAMPLEs have to be classified prior to chemical analysis. Depending on the particle size range of the residue, a classification method has to be selected. For very fine material, air classification is a suitable method. In this work, the results of the classification of fly ash from a biomass combustion plant with an air classifier are discussed with respect to the observed SAMPLE contamination. The chemical analysis of the produced size classes for heavy metals yielded unexpected results. For most heavy metals, the mass balance resulted in a recovery rate of about 100 %; however, for Cr and Ni, the recovery rate was way above 100 %. A more detailed analysis of the data revealed that the ratio of the excess of Cr to Ni in the fly ash was nearly the same as the ratio of Cr to Ni in the material of parts of the classifier. Therefore, erosion of some material from the classifier can be assumed to have caused the contamination of the SAMPLE. For the classification of SAMPLEs, which have to be analysed for Cr and Ni, a classifier has to be used which is made of a material other than stainless steel.

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عنوان: 
نویسندگان: 

نشریه: 

اطلاعات دوره: 
  • سال: 

    1401
  • دوره: 

    7
  • شماره: 

    -
  • صفحات: 

    -
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    7
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 7

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نویسندگان: 

FENG Q. | ENDO K.

اطلاعات دوره: 
  • سال: 

    2002
  • دوره: 

    61
  • شماره: 

    3
  • صفحات: 

    253-261
تعامل: 
  • استنادات: 

    2
  • بازدید: 

    188
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 188

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مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
نویسندگان: 

Eslami Armin | Shokouhi Bidhendi Mohammad Saleh | Jalilisadrabad Samaneh

اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    11
  • شماره: 

    2
  • صفحات: 

    115-132
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    172
  • دانلود: 

    29
چکیده: 

ABSTRACT Considering the concept of quality of life in cities to be the same, urban planners do not have a precise understanding of the factors affecting the quality of life. Therefore, according to the size of the city, different indicators should be considered to measure the quality of life. Thus, according to the main goal of the research, which is to recognize, identify and compile the factors affecting the improvement of the quality of life in middle and small cities on an intra-provincial scale, Qazvin and Zia Abad cities in Qazvin province were selected as study SAMPLEs. In order to achieve the goal of the research, exploratory factor analysis and regression analysis were exerted. The findings show that the homogenization of the indicators affecting the quality of life in all cities is incorrect. Some concepts, such as the size of the city, are effective in compiling and selecting the indicators affecting the quality of life. So, the indicators affecting the quality of life in each city can be different according to some concepts, such as the city's characteristics or the city's size. Examining study SAMPLEs also shows that in small cities, social indicators are more important due to strong social solidarity among people and the high importance of social and cultural concepts. Moreover, in middle cities, due to the importance of finding economic concepts and urban services in people's lives and people's less communication with each other and the weakening of solidarity and social connections, indicators of urban services and facilities and economic factors have the most importance in explaining the quality of life; this shows that the Quality of life indicators are different in all cities Extended Abstract Introduction Quality of life is a multifaceted and dynamic concept that can be different from city to city and region to region and can be defined by various indicators. Not paying attention to this issue and considering the concept of quality of life equally in all cities has caused the level of quality of life to decrease in many cities, especially middle and small cities, in recent years. On the other hand, considering the concept of quality of life in cities to be the same, urban planners do not have a precise understanding of the factors affecting the quality of life. Following this, the main goal of this research is to identify, identify and compile effective factors for improving the quality of life in middle and small cities on an intra-provincial scale. In order to achieve this goal, the cities of Qazvin and Zia Abad in Qazvin province were selected as study SAMPLEs, so that according to the size of the city, in order to achieve the goal of the research, the factors affecting the quality of life are analyzed on an intra-provincial scale.   Methodology The research method is applied research based on quantitative methods. In line with data analysis, after extracting 60 indicators of quality of life, first, the indicators were separated into separate and structured factors using the exploratory factor analysis method in SPSS software. And then, step by step regression method was used to measure the effective factors in improving the quality of life in cities.   Results and discussion The research findings show that based on exploratory factor analysis, 16 factors were extracted in Zia Abad city and 15 factors in Qazvin city as effective factors on the quality of life in small and middle cities. In order to present and explain the factors affecting the improvement of the quality of life in small and middle cities, the factors extracted from the factor analysis were analyzed by multivariate regression method and step-by-step method. Furthermore, finally, (13) factors were introduced in Zia   Abad and (13) factors in Qazvin as the main factors influencing the quality of life. The analysis of the findings indicates that in Zia Abad, factors such as life expectancy and social relations, security, the state of urban services and access to urban facilities, living expenses, the state of urban furniture, urban traffic, the state of offices and housing have more effects in explaining and improving the quality of life. In Qazvin, factors such as the state of urban services, the state of green and public spaces in the city, the state of security and economic opportunities in the city, the density and hope of urban, economic, and cultural life, the state of roads and leisure in the city are effective in explaining the quality of life. Following this, according to the above findings, quality of life is a multidimensional and dynamic concept that directly relates to the type of cities and the specific characteristics of cities. Therefore, the quality of life and its indicators can differ from city to city; because every city has its characteristics and characteristics with citizens with different cultures and thinking, which causes the factors affecting the quality of life to be different. Therefore, considering the quality of life and its indicators to be the same in all cities is wrong, which can lead to the decline of the quality of life and the failure of quality of life improvement programs.   Conclusion Finally, the research results indicate that quality of life is a simple concept covering various urban life aspects. This concept can be defined as a determining factor in the excellence and progress of cities and residents' satisfaction with their urban life. It is multifaceted and dependent on place and time. As a result, the perception of people in different cities and communities about the concept of quality of life and the factors affecting it can be different. Following this, factors and indicators should be selected according to the characteristics and conditions of that city in urban planning to improve the quality of life for each city. Thus, this research, using the classification of cities based on the size of the city, has presented factors specifically for middle and small cities, which in small cities due to strong social solidarity among people and the great importance of social and cultural concepts, social indicators are more important. Moreover, in middle cities, due to the importance of finding economic concepts and urban services in people's lives and people's less communication with each other and the weakening of solidarity and social connections, indicators of urban services and facilities and economic factors have the most importance in explaining the quality of life; this shows that the quality of life indicators are different in all cities.   Funding There is no funding support.   Authors’ Contribution All of the authors approved the content of the manuscript and agreed on all aspects of the work.   Conflict of Interest Authors declared no conflict of interest.   Acknowledgments We are grateful to all the scientific.

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عنوان: 
اطلاعات دوره: 
  • سال: 

    2013
  • دوره: 

    2
تعامل: 
  • بازدید: 

    160
  • دانلود: 

    0
چکیده: 

THE PURPOSE OF THIS STUDY WAS IDENTIFYING DUST MANAGEMENT STRATEGIES. IN ORDER TO ACHIEVE THIS PURPOSE, DELPHI METHOD WAS USED. 21 DUST EXPERTS (FACULTY MEMBERS OF KERMANSHAH UNIVERSITIES) WERE SELECTED AS MEMBERS OF DELPHI PANEL BY MEANS OF PURPOSESIVE SAMPLING. FINALLY 16 STRATEGIES IN TWO CATEGORIES (DUST CONTROL AT ITS SOURCE AND REDUCTION DUST CONCENTRATION IN THE AIR), WERE IDENTIFIED AND DETERMINED.

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اطلاعات : 
  • تاریخ پایان: 

    دی 1392
تعامل: 
  • بازدید: 

    760
چکیده: 

مقدمه: شناسایی بیومارکرهای پروتئینی یا پپتیدی در مایعات بیولوژیکی مانند سرم، پلاسما و یا مایع نخاعی، بدلیل وجود برخی پروتئین های دارای غلظت بالا همچون آلبومین، ایمونوگلوبولین و چند پروتئین دیگر غالبا دچار مشکل می شود. حذف اختصاصی این پروتئین ها در مطالعات پروتئومیک از اهمیت بالایی برخوردار است، زیرا همپوشانی پروتئین های یاد شده با دیگر پروتئین ها بر روی ژل الکتروفورز دو بعدی مانع بزرگی در روئیت و جداسازی پروتئین های دارای فراوانی کم لیکن مهم از نظر بالینی می باشد. روش هایی برای حذف پروتئین های با غلظت بالا وجود دارند که از این میان روش کروماتوگرافی ایمونوافینیته تحت فشار با اختصا صیت بیشتری عمل می کند. روشها: در این طرح پس از آماده سازی سیستم HPLC، نمونه پلاسمای انسان به ستون ایمونوافینیتی تزریق و حداسازی با کمک بافر شستشو تحت فشار مناسبی در شرایط گرادیان انجام پذیرفت. در مرحله بعد پروتئین های متصل شده (با فراوانی بالا) به کمک بافر جداکننده از ستون خارج گردیدند. نمونه پلاسما قبل از تزریق، جزء جدا شده با بافر شستشو و جزء مربوط به پروتئین های با فراوانی بالا جهت بررسی باندهای پروتئینی توسط الکتروفورز SDS-PAGE در شرایط گرادیان (20%-4) بررسی شدند. نمونه های ذکر شده همچنین جهت بررسی وضعیت هم پوشانی بر روی الکتروفورز دو بعدی مطالعه شد. نتایج و تحلیل: بررسی جزء پروتئین های با فراوانی بالا توسط SDS-PAGE گرادیان حاکی از وجود 14 باند پروتئینی مورد انتظار بود که ستون قادر به جداسازی آن از پلاسما گشته است، در حالی که این پروتئین ها در جزء جدا شده با بافر شستشو FT)) در شرایط غیر تغلیظ و نیز چندین برابر تغلیظ رویت نشدند. بررسی مقایسه ای پلاسما و جزء FT توسط الکتروفورز دو بعدی نیز نشان دهنده حذف پروتئین های با فراوانی بالا می باشد. نتایج حاکی از آن است که ستون MARS قابلیت حذف زیادی (حدود 95%) از پروتئین های پلاسما را دارد. حذف 14 پروتئین دارای فراوانی بالا از پلاسمای انسان، روئیت پروتئین های با فراوانی کم را در ژل الکتروفورز دو بعدی به میزان زیادی افزایش داده و باعث می شود که بتوانیم پروتئین های باقیمانده را به میزان 40 تا 50 بار تغلیظ نموده و امکان روئیت آنها را جهت انتخاب از روی ژل و استفاده در آنالیز اسپکترومتری جرمی فراهم نماییم.

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اطلاعات دوره: 
  • سال: 

    2018
  • دوره: 

    5
  • شماره: 

    2
  • صفحات: 

    63-74
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    178
  • دانلود: 

    0
چکیده: 

The characteristics of arbitrary amplitude DUST ion acoustic solitary waves (DIASWs) are studied in unmagnetized DUSTy plasmas whose constituents are cold uid ions, nonextensive electrons and stationary negative/positive DUST particles. The pseudopotential approach has been used to investigate the structure of localized waves. It is found that, solitary waves exist in a definite interval for the Mach number which depends sensitively to the electron nonextensivity and DUST polarity. Our results can be useful to understand the properties of localized electrostatic disturbances that may occur in astrophysical and space DUSTy plasmas.

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اطلاعات دوره: 
  • سال: 

    1401
  • دوره: 

    16
  • شماره: 

    63
  • صفحات: 

    1-14
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    133
  • دانلود: 

    48
چکیده: 

گرد و غبار یکی از پدیده های جوی است که آثار و پیامدهای زیست محیطی نامطلوبی برجای می گذارد. برای بررسی غبار ریزشی شهر سبزوار، در سال 1390 و درانتهای چهار فصل، نمونه ها در ایستگاه های شانزده گانه ی منتخب در پشت بام منازل مسکونی یا ساختمان های اداری و بر مبنای جهت های جغرافیایی اصلی و فرعی جمع-آوری شده و با ترازوی با دقت 0001/0 توزین گردیدند. اکسیدهای اصلی و عناصر فرعی ریزگردها با استفاده از روش جذب اتمی وطیف سنجی پلاسمای جفت شده القایی برای مطالعات ژئوشیمیایی با توجه به حجم غبار جمع شده و اهمیت نمونه ها، مشخص و اندازه گیری شدند. نتایج به دست آمده نشان داد که بیشترین حجم غبار ریزشی در سبزوار مربوط به فصل بهار است در حالیکه غلظت و تراکم اغلب عناصر آلاینده در فصل پاییز بیشتر است. از نظر آلودگی، عناصر کادمیوم و روی با قرار گرفتن در محدوده آلودگی شدید و ضریب آلودگی بسیار بالا و قابل توجه در غبارریزشی شهر سبزوار در درجه اول اهمیت قرار دارند. عناصر کروم و نیکل با قرار گرفتن در محدوده آلودگی متوسط و ضریب آلودگی قابل توجه دردرجه بعدی اهمیت هستند. در شرایط فعلی، آلودگی عناصر آلاینده مانند مس، سرب و آرسنیک در ریزگردهای شهر سبزوار بحرانی و نگران کننده نیست.

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نویسندگان: 

BUTTE W. | EILERS J. | ERTL H.

اطلاعات دوره: 
  • سال: 

    2004
  • دوره: 

    64
  • شماره: 

    3
  • صفحات: 

    91-94
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    214
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 214

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عنوان: 
نویسندگان: 

LEFAY R.

نشریه: 

VIRTUAL

اطلاعات دوره: 
  • سال: 

    621
  • دوره: 

    1
  • شماره: 

    1
  • صفحات: 

    39-42
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    185
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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