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نتیجه جستجو - Emergy accounting

تعداد مقالات یافته شده: 5
ردیف عنوان نوع
1 Efficiency assessment in co-production systems based on modified emergy accounting approach
ارزیابی کارایی در سیستم های تولید مشترک بر اساس رویکرد حسابداری اضطراری اصلاح شده-2021
Emergy accounting in a system with co-production branch is of great scientific interest since each branch cor- responds to a different transformity value. In previous studies, limitations associated with emergy accounting in co-production systems have been highlighted where some “inputs” have to be added to obtain a “useful” product from a “co-product” – giving rise to inaccuracies in the emergy accounting process. To address these method- ological aspects of emergy assessment in co-production systems, a modified physical quantity method (MPQM) – that goes in line with the standard emergy algebra – has been proposed in order to provide a different perspective for accounting co-products efficiency. The robustness of MPQM has been verified by taking the case study of Eucalyptus pulp production and a comparison is made against conventional and energy/exergy weighting methods. As per the results, MPQM was able to provide accurate results for co-production systems as compared with other emergy accounting methods. However, the case of Eucalyptus pulp production was found to be “inefficient” following the MPQM approach. These findings are expected to strengthen the methodological as- pects of emergy accounting based on the physical quantity criterion.
keywords: ظهور | سیستم تولید همکاری | روش فیزیکی اصلاح شده | دگرگونی | ارزیابی کارایی | Emergy | Co-production system | Modified physical quantity method | Transformity | Efficiency assessment
مقاله انگلیسی
2 Environmental and economic sustainability of key sectors in Chinas steel industry chain: An application of the Emergy Accounting approach
پایداری محیط زیست و اقتصادی بخش های کلیدی در زنجیره صنعت فولاد چین: استفاده از رویکرد حسابداری ظاهری-2021
Increasing urbanization day–by–day requires new housing and transportation infrastructures. As a consequence, demand for steel – a basic material for buildings construction as well as for vehicles and railroads – would also increases. This study applies Emergy Accounting (EMA) to assess the Chinás steel industry environmental per- formance and to identify key application sectors. Subsequently, this study calculates emergy–based indicators capable to assess the present economic performance, environmental sustainability, and land resource appropriate utilization. Building on these indicators, changes of sustainability scenarios in key application sectors are also investigated, with special focus on increased use of recycled steel. The results show that the environmental impacts of steel use in downstream sectors, specially in the Housing and Vehicles Sectors, are significantly higher. Furthermore, the downstream sectors also have a very large requirement for embodied land. Addition- ally, the Emergy Benefit Ratio (EBR) shows non-negligible advantages to China derived from importing raw iron from abroad at international market prices. Finally, when the recycling rate of scrap steel increases, the per- formance of downstream sectors improves, with the Vehicle sector showing the most significant changes. Although the benefits of steel-based economy to society are clear, multidimensional sustainability concerns and international competition for primary resources necessitate a transition towards increased recycling and inno- vative materials within a strictly enforced “circular economy” policy.
keywords: بخش های کاربردی فولاد | حسابداری امری | بازیافت فولاد و استفاده مجدد از فولاد | ارزیابی پایداری | Steel application sectors | Emergy accounting | Steel recycling and reusing | Sustainability assessment
مقاله انگلیسی
3 Global assessment of marine phytoplankton primary production: Integrating machine learning and environmental accounting models
ارزیابی جهانی از تولید اولیه فیتوپلانکتون دریایی: یکپارچه سازی یادگیری ماشین و مدل های حسابداری محیطی-2021
The emergy accounting method has been widely applied to terrestrial and marine ecosystems although there is a lack of emergy studies focusing on phytoplankton primary production. Phytoplankton production is a pivotal process since it is intimately coupled with oceanic food webs, energy fluxes, carbon cycle, and Earth’s climate. In this study, we proposed a new methodology to perform a biophysical assessment of the global phytoplankton primary production combining Machine Learning (ML) techniques and an emergy-based accounting model. Firstly, we produced global phytoplankton production estimates using an Artificial Neural Network (ANN) model. Secondly, we assessed the main energy inputs supporting the global phytoplankton production. Finally, we converted these inputs into emergy units and analysed the results from an ecological perspective. Among the energy flows, tides showed the highest maximum emergy contribution to global phytoplankton production highlighting the importance of thise flow in the complex dynamics of marine ecosystems. In addition, an emergy/ production ratio was calculated showing different global patterns in terms of emergy convergence into the primary production process. We believe that the proposed emergy-based assessment of phytoplankton produc- tion could be extremely valuable to improve our understanding of this key biological process at global scale adopting a systems perspective. This model can also provide a useful benchmark for future assessments of marine ecosystem services at global scale.
keywords: تولید اولیه فیتوپلانکتون | اکولوژی سیستم ها | شبکه های عصبی مصنوعی | یادگیری ماشین | حسابداری امری | Phytoplankton primary production | Systems ecology | Artificial neural networks | Machine learning | Emergy accounting
مقاله انگلیسی
4 EMergy accounting for the Three Gorges Dam project: three scenarios for the estimation of non-renewable sediment cost
حسابداری EMergy برای پروژه سه دره سد: سه سناریو برای برآورد هزینه رسوب غیر قابل تجدید-2016
Dam construction conflicts are typically multidimensional, complex, and dynamic. Until recently, the environmental impact assessment of large dam projects was not fully acknowledged due to the uncer- tainty of the issue and the current knowledge on the accountability of ecological services. The mea- surement on the sustainability of the production system with a holistic view are thus of great relevance for the decision makers to implement the sustainable energy policy. In this paper, an integrated EMergy accounting was presented for assessing how the Three Gorges Dam project has performed based on the sustainability criteria. We quantified each EMergy flow component of energy, material and purchased input with available data in an assumed 100-year lifetime run. Special attention is focused on three simplified scenarios for estimating the EMergy cost of sediment. Our results showed that when the EMergy cost of sediment was counted, the Environmental Sustainability Index decreased dramatically with the increasing of the nonrenewable input. The results serve as a reminder of the necessity to apply different transformities for sediment EMergy cost in any hydro project, depending on the unique ecological service of sediment in the local river system. However, due to the high intensity of local renewable EMergy flow, the Environmental Loading Ratios and the Investment Ratios of the Three Gorges Dam system were relatively low. In spite the fluctation, the Environmental Sustainability Index remained higher than that of China in 1996, no matter the sediment EMergy cost was included or not.© 2015 The Author. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-NDlicense (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: EMergy accounting | Sediment | Environmental sustainability index | Three Gorges Project
مقاله انگلیسی
5 محاسبه اِمرژی (مجموع انرژی ها) برای پروژه سد سه گلویی: سه طرح کلی برای تخمین هزینه رسوب غیر قابل تجدید
سال انتشار: 2016 - تعداد صفحات فایل pdf انگلیسی: 7 - تعداد صفحات فایل doc فارسی: 21
کشمکش های ساخت سد نوعا" چند بُعدی، پیچیده و پویا هستند. تا چند وقت اخیر، بررسی اثر محیطی پروژه های بزرگ سد به علت عدم قطعیت مسئله و دانش فعلی درباره پاسخگو بودن خدمات زیست محیطی، کاملا" تایید نشده است. بنابراین اندازه گیری میزان پایداری سیستم تولید با یک دیدگاه کلی نگر برای تصمیم سازها جهت اجرای سیسات انرژی پایدار، مناسب ترین گزینه می باشد. در این مقاله، یک حسابداری امرژی برای بررسی اینکه چگونه پروژه سد سه گلویی بر مبنای معیارهای پایداری انجام شده است، ارائه شده است. ما هر مولفه جریان امرژی انرژی، مواد و ورودی های خریداری شده را با همه داده های در دسترس در یک دوره زمانی فرضی 100 ساله به کمّیت درآوردیم. توجه ویژه بر روی طرح های ساده سازی شده برای تخمین هزینه حسابداری امرژی رسوب، متمرکز می باشد. نتایج ما نشان داد که وقتی که هزینه امرژی رسوب محاسبه شد، با افزایش وروردی های غیرقابل تجدید، شاخص پایداری محیطی به صورت چشمگیری کاهش می یابد. نتایج به عنوان یک یادآوری کننده ضرورت به کارگیری تبدیل های مختلف برای هزینه امرژی رسوب در هر پروژه آبی، بسته به خدمات زیست محیطی منحصر به فرد رسوب در سیبستم رودخانه ای محلی، عمل می کند. با این حال، به علت شدت بالای جریان امرژی محلی غیر قابل تجدید، نسبت های بار محیطی و نسبتهای سرمایه گذاری روی سیستم سد سه گلویی نسبتا" پایین است. شاخص پایداری محیطی از شاخص چین در سال 1996 بالاتر باقی مانده است صرفنظر از اینکه هزینه امرژی رسوب را شامل شود یا خیر.
کلید واژه ها: حسابداری امرژی | تحویل رسوب | شاخص پایداری محیطی | پروژه سه گلویی
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