فیلترها/جستجو در نتایج    

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اطلاعات دوره: 
  • سال: 

    2020
  • دوره: 

    10
  • شماره: 

    1
  • صفحات: 

    3149-3157
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    184
  • دانلود: 

    0
چکیده: 

Driving cycle is used to assess fuel consumption, pollutant emissions and performance of the vehicle. The aim of this paper is to extract the driving cycle for Refuse collection truck and estimate its braking energy. For this purpose, after selecting the target truck and geographic area, the equipment needed to measure the required variables were prepared and mounted on the truck. Then, the actual data were collected from the performance of the target truck while performing its mission. Since the amount of braking energy depends on the speed, truck mass and road grade, the speed of the vehicle is measured simultaneously with the truck mass and road grade. The collected data are then processed and subdivided into micro-trips. The micro-trips are clustered according to the number of state spaces using the K-Means algorithm. Next, the representative micro trips are selected from within the clusters and the final driving cycle is generated. The representative driving cycle shows that the truck speed is zero at 47% of the working time. Finally, the amount of braking power and accumulative braking energy in the driving cycle is calculated.

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اطلاعات دوره: 
  • سال: 

    1393
  • دوره: 

    14
  • شماره: 

    15 (فوق العاده)
  • صفحات: 

    307-315
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1197
  • دانلود: 

    280
چکیده: 

هدف از انجام این تحقیق، مطالعه امکان سنجی و طراحی سیستم قوای محرکه هیبرید هیدرولیک برای خودروی خدمات شهری به منظور بازیابی و ذخیره انرژی جنبشی و استفاده مجدد آن در تامین توان رانشی خودرو می باشد. سیستم قوای محرکه هیبرید هیدرولیک شامل موتور احتراق داخلی، پمپ/موتور هیدرولیکی و انباره هیدرولیکی به عنوان منبع ذخیره انرژی می باشد. در این تحقیق از ساختار موازی برای سیستم قوای محرکه استفاده شده است. در مرحله اول مطالعه امکان سنجی فنی استفاده از سیستم قوای محرکه هیبرید هیدرولیک به منظور کاهش مصرف سوخت انجام گرفته است. در این تحقیق کامیون اکسور 1828 به عنوان خودروی هدف انتخاب شده است و با توجه به منحصر به فرد بودن سیکل رانندگی خودروی خدمات شهری جهت افزایش اعتبار نتایج امکان سنجی و طراحی، سیکل رانندگی خودروی خدمات شهری تهران استخراج شد. استخراج سیکل رانندگی خودروی خدمات شهری با بررسی سیکل حرکتی یک خودرو در روزهای کاری مختلف بدست آمده است. در مرحله بعد اندازه و نوع المان های هیبرید هیدرولیک با هدف بازیابی انرژی جنبشی خودرو در سیکل رانندگی استخراج شده، طراحی و انتخاب شده است. بر اساس طراحی های انجام شده، با استفاده از سیستم قوای محرکه هیبرید هیدرولیک، 17 درصد از انرژی ترمزی خودرو در طول یک سیکل رانندگی بازیابی و مجددا استفاده می شود.

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اطلاعات دوره: 
  • سال: 

    1401
  • دوره: 

    13
  • شماره: 

    1
  • صفحات: 

    167-197
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    200
  • دانلود: 

    18
چکیده: 

In the present study, the main purpose is the qualitative study on garbage collection in Tehran city. It has been done by qualitative research method. Semi-structured interview and purposeful sampling techniques were used in data collection. To do this, 15 people were interviewed and the sample size in the present study was determined based on theoretical saturation. Thematic analysis was used to analyze the data. Theme analysis was performed at 4 levels of primary, main, central and core themes. A total of 184 initial themes were extracted from all interviews. In the main coding stage, the following 9 main themes were merged. Escape from poverty in the origin and the inevitable choice of inferiority, society's view to garbage collectors, and high stress, strengthening the cycle of academic reluctance and illiteracy, physical and mental torment, unknown horizon and confusion of the Khojies, legal ambiguity and customary definitions and contracts, complaints from relevant institutions, the entry of the mafia and the formation of rent and corruption. Finally, these themes fall into two categories of social harmfulness of recycling and institutional exclusion and illegallity of the status of garbage collectors in the second distrect in the form of the core theme of the structure of socially harmful and institutionally illegal, waste phenomenon explained..

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

OGWUELEKA T.CH.

اطلاعات دوره: 
  • سال: 

    2004
  • دوره: 

    3
  • شماره: 

    2
  • صفحات: 

    71-76
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    199
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 199

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نویسندگان: 

QASIM S.R. | BURCHINAL J.C.

اطلاعات دوره: 
  • سال: 

    1970
  • دوره: 

    96
  • شماره: 

    1
  • صفحات: 

    49-58
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    192
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 192

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اطلاعات دوره: 
  • سال: 

    2023
  • دوره: 

    26
  • شماره: 

    5
  • صفحات: 

    267-274
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    13
  • دانلود: 

    0
چکیده: 

Background: Anti-vaccination is spreading among parents. In 2017, 23000 families in Turkey Refused vaccinations for their children. Meanwhile an increase in infectious diseases was observed, which might be caused by vaccination rejection. The reasons why families do not vaccinate their children may be very different, such as side effects, or advocation for “healthy life” by gurus. However, the real reasons for vaccine refusal are unknown. Our aim is to determine the reasons for anti-vaccination in Turkey. Methods: In order to reveal the real reasons for not taking the vaccine, we planned to conduct interviews with the representatives of the vaccine rejection group using qualitative research methodology with the “grounded theory” method. We searched some anti-vaccination blogs to find candidates for interviews. Within the scope of our study, parental concerns about vaccinations were classified by analyzing the data obtained from semi-structured questions and interviews recorded with voice recorders in face-to-face interviews with 21 parents in 13 cities of Turkey. Results: The obtained findings were classified under the headings of ‘’mistrust’’, ‘’vaccine efficacy-importance’’, ‘’decision-making processes - bases’’, and ‘’law-ethics’’. Mistrust was the main theme, almost singularly, as the most important reason for vaccine rejection. The salient reasons for mistrusts were: Companies which produce vaccines especially international companies because of conspiratory beliefs; health authorities, because of the belief about non-transparency in epidemiologic data, immunization council etc. and healthcare professionals, because of their non-communicative and non-concerned attitude. Conclusion: Mistrust is hard to overcome. The beliefs of the patients cannot be easily changed. As a result of our study, we made some recommendations for health authorities, healthcare professionals, companies and other related stakeholders.

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

لطفی اسداله

اطلاعات دوره: 
  • سال: 

    1389
  • دوره: 

    7
  • شماره: 

    22
  • صفحات: 

    143-156
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    4577
  • دانلود: 

    787
چکیده: 

در شریعت اسلام، مطابق آیات قرآنی و روایات مسلم اسلامی، کیفر قتل عمد با شرایطی در وهله اول، قصاص است، هرچند قابل تبدیل به دیه و قابل گذشت نیز می باشد، از اصل اولیه کیفر قصاص، مواردی استثنا گشته و مطابق دلایل خود، عمومات و اطلاقات ادله قصاص را تخصیص و تقیید داده است، اهم موارد استثنا عبارتند از: دیوانه، کودک، پدر در کشتن فرزند، مسلمان در کشتن کافر و عاقل در کشتن دیوانه، عبارت: «لا قود لمن لا یقاد منه» که برگرفته از پاره ای روایات وارده در خصوص قصاص می باشد، استثنا و تخصیصی بر ادله عام کیفر قصاص است که به موجب آن، قاتل کودک و دیوانه قصاص نمی شود.

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بازدید 4577

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 787 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
نویسندگان: 

PARK H.I. | LEE S.R.

اطلاعات دوره: 
  • سال: 

    1997
  • دوره: 

    24
  • شماره: 

    4
  • صفحات: 

    159-165
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    291
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 291

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نویسندگان: 

OBERG A.

نشریه: 

METAL FINISHING

اطلاعات دوره: 
  • سال: 

    1997
  • دوره: 

    95
  • شماره: 

    8
  • صفحات: 

    26-31
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    89
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 89

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اطلاعات دوره: 
  • سال: 

    2020
  • دوره: 

    15
  • شماره: 

    59
  • صفحات: 

    32-61
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    94
  • دانلود: 

    0
چکیده: 

The joining of consumers to online brand community provides the brand managers with potential opportunities offered upon extensive interactions and establishing strong emotional relations between the firms and customers. A review of the studies performed so far show that the research on the importance of the joining of consumers to Online Brand Community, as a first step toward having them engaged with the brand, is by far inadequate. Therefore, the aim of the present work is to fill in this research the gap and identify the factors hindering the virtual relationship between the firms and their customers. The required data was collected via a qualitative approach based on thematic analysis, purposive sampling, and interviews with 12 consumers of three internet service providers (Shatel, HiWeb, and Sabanet). The data was then, coded and analyzed, and the network of the extracted themes was developed. The main themes identified in this research included negative consumer’ s attitude toward the social networks, the product type, preference of the company’ s interests over the customer’ s interests, lack of the customer’ s awareness of the presence of the company on social networks, less than enough involvement of the consumer with the product, the consumer’ s dissatisfaction with the brand, provision of alternative services, inappropriate image of the Online Brand Community, devaluation of the other members’ information, and failure to offer attractive financial incentives.

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بازدید 94

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