دانلود و نمایش مقالات مرتبط با Greece::صفحه 1
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نتیجه جستجو - Greece

تعداد مقالات یافته شده: 46
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1 Reinforcement learning based adaptive power pinch analysis for energy management of stand-alone hybrid energy storage systems considering uncertainty
تجزیه و تحلیل جایگزین قدرت تطبیقی مبتنی بر یادگیری تقویتی برای مدیریت انرژی سیستم های ذخیره سازی انرژی ترکیبی مستقل با توجه به عدم اطمینان-2020
Hybrid energy storage systems (HESS) involve synergies between multiple energy storage technologies with complementary operating features aimed at enhancing the reliability of intermittent renewable energy sources (RES). Nevertheless, coordinating HESS through optimized energy management strategies (EMS) introduces complexity. The latter has been previously addressed by the authors through a systems-level graphical EMS via Power Pinch Analysis (PoPA). Although of proven efficiency, accounting for uncertainty with PoPA has been an issue, due to the assumption of a perfect day ahead (DA) generation and load profiles forecast. This paper proposes three adaptive PoPA-based EMS, aimed at negating load demand and RES stochastic variability. Each method has its own merits such as; reduced computational complexity and improved accuracy depending on the probability density function of uncertainty. The first and simplest adaptive scheme is based on a receding horizon model predictive control framework. The second employs a Kalman filter, whereas the third is based on a machine learning algorithm. The three methods are assessed on a real isolated HESS microgrid built in Greece. In validating the proposed methods against the DA PoPA, the proposed methods all performed better with regards to violation of the energy storage operating constraints and plummeting carbon emission footprint.
Keywords: Hybrid energy storage systems | Energy management strategies | Model predictive control | Kalman filter | Reinforcement learning
مقاله انگلیسی
2 Precision livestock farming, automats and new technologies: possible applications in extensive dairy sheep farming
دامداری دقیق ، اتومات و فناوری های جدید: کاربردهای احتمالی در دام گسترده تولید گوسفند شیری-2020
Precision livestock farming (PLF) technologies are becoming increasingly common in modern agriculture. They are frequently integrated with other new technologies in order to improve human–livestock interactions, pro- ductivity and economical sustainability of modern farms. New systems are constantly being developed for concentrated farming operations as well as for extensive and pasture-based farming systems. The development of technologies for grazing animals is of particular interest for the Mediterranean extensive sheep farming sector. Dairy sheep farming is a typical production system of the area linked to its historical and cultural traditions. The area provides roughly 40% of the world sheep milk, having 27% of the milk-producing ewes. Developed countries of the area (France, Italy, Greece and Spain – FIGS) have highly specialized production systems improved through animal selection, feeding techniques and intensification of production. However, extensive systems are still practiced alongside intensive ones due to their lower input costs and better resilience to market fluctuations. In the current article, we evaluate possible PLF systems and their suitability to be incorporated in extensive dairy sheep farming as practiced in the FIGS countries. Available products include: electronic identification systems (now mandatory in the EU) such as ear tags, ruminal boluses and sub-cutaneous radio-frequency identification; on-animal sensors such as accelerometers, global positioning system) and social activity loggers; and stationary management systems such as walk-over-weights, automatic drafter (AD), virtual fencing and milking parlourrelated technologies. The systems were considered according to their suitability for the management and business model common in dairy sheep farming. However, adoption of new technologies does not take place immediately in small and medium scale extensive farmer. As sheep farmers usually belong to more conservative technology consumers, characterized by average age of 60 and a very transparent community, dynamics which does not favor financial risk taking involved with new technologies. Financial barriers linked to production volumes and resource management of extensive farming are also a barrier for innovation. However, future prospective could increase the importance of technology and promote its wider adoption. Trends such as global sheep milk economics, global warming, awareness to animal welfare, antibiotics resistance and European agricultural policies could influence the farming practices and stimulate wider adoption of PLF systems in the near future.© 2020 The Authors. Published by Elsevier Inc. on behalf of The Animal Consortium. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).IThplicationsAs precision livestock farming systems become ever more permanent in modern agriculture, their adoption in extensive farming is gradually taking place. As extensive Mediterranean dairy sheep production holds global importance in agricultural economics, possible solutions and precision livestock farming options could be considered. However, as in many other parts of the world, farmers’ acceptance and openness towards new technologies remains relatively low. Possible developments such as global warming, consumer awareness, global and local economics and European Union policies could change the current status and increase the adoption of precision livestock farming systems in the sector.
Keywords: Extensive farming | Farmers acceptance | New technologies | Precision livestock farming | Sheep
مقاله انگلیسی
3 Family business succession: Analysis of the drivers of success based on entrepreneurship theory
جانشینی مشاغل خانوادگی: تحلیل عوامل محرک موفقیت براساس تئوری کارآفرینی-2020
This study explores family business succession. In this study, succession is compared to the concept of oppor- tunity versus necessity entrepreneurship. The motivations of successors when they enter the succession process are examined to identify different conditions for family business success and sustainability. The influence of context is also considered. This study is based on multilevel research and a multidisciplinary perspective. Fuzzy- set qualitative comparative analysis (fsQCA) is applied to a sample of 383 observations from 6 countries (Portugal, Italy, Greece, Cyprus, North Macedonia, and Bulgaria) spanning 2 regions: southern European Mediterranean countries (Portugal, Italy, Greece, and Cyprus) and southern Slavic countries (North Macedonia and Bulgaria). The interplay between personal characteristics of the successor, organizational characteristics of the family business, and context produces different patterns that lead to different outcomes in the succession processes of family businesses. The results are important to strengthen family business theory and identify the conditions that best promote the future growth and sustainability of family businesses. The results are also important to promote country-specific public policies that may create better conditions for successors in family businesses to succeed.
Keywords: Family business | Succession | Successors’ motivation | Opportunity succession | Necessity succession | Entrepreneurship
مقاله انگلیسی
4 Experimental and feasibility study of spent coffee grounds upscaling via pyrolysis towards proposing an eco-social innovation circular economy solution
مطالعه تجربی و امکان سنجی قهوه مصرفی که از طریق تجزیه در اثر تجزیه در اثر تجزیه در اثر تجزیه در اثر تجزیه در اثر تجزیه در اثر تجزیه در اثر استفاده از تجزیه در اثر تجزیه و تحلیل مواد شیمیایی ، به منظور ارائه یک راه حل اقتصاد دایره ای نوآوری اقتصادی - اجتماعی-2020
There is a need for eco-social business models in the food waste sector that are more cascading and circular- based, while having economic, environmental and social benefits. The aim of this study is to bring insights and data of spent coffee grounds large-scale slow pyrolysis, to seize new opportunities for eco-innovative solutions in the circular economy, by identifying upcycling opportunities for resource recovery of this waste. First, an experimental study was conducted, and a set of pyrolysis experiments were carried out at a temperature range from 450 to 750 °C, with a heating rate of 50°/s, under helium atmosphere, to explore the products yields and the best process conditions. Second, an economic study was conducted for a standalone pyrolysis plant fueled with the spent coffee grounds streams from coffee shops of a city with 150,000 inhabitants, in central Greece, aiming at the cost and the profitability of the endeavor estimation. The calculations were based on the features of a slow pyrolysis rotary kiln technology designed at Aristotle University, and co-developed with an Irish company, under the funding of an EU LIFE+ project. For an estimated capacity of 2566 t/yr of SCG, the revenue of the endeavor was calculated at 47€/t of SCG. The economic indicators ROI and POT (ROI = 0.24, POT = 2.6), are very Abbreviations: CE, circular economy; FL, food loss; FW, food waste; HHV, higher heating value; LHV, lower heating value; POT, payout time; ROI, return on investment; SCG, spent coffee ground; GC, gas chromatograph.⁎ Corresponding author. E-mail address: azampani@auth.gr (A. Zabaniotou).https://doi.org/10.1016/j.scitotenv.2020.137316 0048-9697/© 2020 Elsevier B.V. All rights reserved. positive, suggesting pyrolysis of SCG as an efficient circular economy management solution, providing an eco- social innovation business in the coffee shop industry, engaging also consumers in the circular economy.‌© 2020 Elsevier B.V. All rights reserved.
Keywords: Circular economy | Food wastes | Spent coffee grounds (SCG) | Pyrolysis: Economic study | Eco-social innovation
مقاله انگلیسی
5 Change point analysis on the Corinth Gulf (Greece) seismicity
تجزیه و تحلیل نقطه تغییر در لرزه نگاری خلیج Corinth (یونان) -2020
Change point analysis is performed on the seismicity in Gulf of Corinth (Greece), an extensional graben which constitutes one of the most seismically active areas in Greece. Seismicity appears intense and strongly clustered and therefore analysis on mean and variance is appropriate. Sample autocorrelation function of the data is non-zero even for bigger lags, indicating long-range correlations. This phenomenon can be justified by possible changes in the mean of the observations. Non-parametric multiple change point analysis is applied to both the sequence of the earthquakes from a set of observations and its detrended data considering the earthquake occurrence frequency. The results of the analysis on the initial data set are compared to those of its detrended residuals. This procedure employs both online and offline methods providing different perspectives. Promising patterns are defined offline and most of them are detectable online.
Keywords: Change point analysis | Linear stochastic modelling | Seismicity | Gulf of Corinth (Greece)
مقاله انگلیسی
6 Insights into involuntary hospital admission procedures for psychiatric patients: A 3-year retrospective analysis of police records
Insights into involuntary hospital admission procedures for psychiatric patients: A 3-year retrospective analysis of police records-2020
The procedure of involuntary hospitalization has been an ongoing subject of study. Its implementation requires the systematic co-ordination between the Justice and Health Care systems around the globe. In the case of Greece, the procedure under discussion is regulated by Law 2071/1992, which designates the Police as the agent that links the aforementioned systems together. The present study aims to shed light upon the procedure of involuntary hospitalizations, regarding the preparatory stage and the Police involvement up to the individuals’ admission to the on-call hospital for a mental health assessment (MHA). The entry data of two police stations in Athens was recorded by the respective Duty Officer responsible for each case. The police records were retro- spectively inspected and information on socio-demographic, clinical and parametric characteristics was extracted. The data collection took place between March and July 2020 and included 324 cases, 80.3% of which referred to involuntary hospitalizations; 17.6% of sample cases did not meet the criteria of the procedure, as opposed to 1.9% of the cases in which the patients eventually ended up being voluntarily admitted and after- wards hospitalized for treatment. There was a statistically comparison of socio-demographic, clinical and parametric variables in relation to the status of hospitalization groups (involuntary, voluntary and no hospi- talization). Additionally, statistical comparisons were made between parametric and clinical variables in relation to the type of prosecution order (written: standard route, oral: emergency route). Acute mental health deteri- oration accounted for around 45% of the total data and it has been identified as the main factor for informing the Hearings Prosecutor office mainly by the patient’s family and subsequently proceeding to the issuance of an order (in either written or oral form) to the Police. This enables the Police to escort the individuals and lead them to a psychiatric unit for mental health assessment (MHA) and based on this, for involuntary hospitalization if deemed necessary. In 87.9% of the cases, the individual was transported by police vehicles over a time span ranging from the very same day to 22 days. In total, the written prosecution orders (63.6%) outnumbered the oral ones (36.7%). The findings of the present study demonstrate that the Prosecution order type varies signif- icantly depending on the causes that instigated the involuntary hospitalization procedure. The psychiatric de- cision whether there should be hospitalization or outpatient therapy also significantly varies depending on the diagnosis. Lastly, the results point out that the need for improvement and further clarification of the afore- mentioned Greek Law is absolutely essential.
Keywords: Preparatory involuntary hospitalization | procedure | Police records | Prosecution order type
مقاله انگلیسی
7 A marine geoarchaeological investigation for the cultural anthesis and the sustainable growth of Methoni, Greece
یک بررسی ژئو باستان شناسی دریایی برای گرده افشانی فرهنگی و رشد پایدار متوونی ، یونان-2020
The ‘Evolved GE.N.ESIS Project’ highlights the underwater cultural heritage resources off the coast ofMethoni, Greece that could locally drive sustainable socioeconomic growth. An integrated marine geo-physical survey, a hydrographic survey, and a GNSS survey were conducted off Methoni, recording sixhistoric wreck sites, artefacts, the ruins of a submerged prehistoric settlement, and the town’s ancientharbour/breakwater, as well as the geophysical properties of the underwater environment. The prelim-inary project results present bathymetric surfaces, backscatter intensity and magnetic maps, drawings,and seismic reflection profiles of the underwater antiquities and of the seabed, all fused in a 3D geo-graphical platform. The results also shed light on the archaeological potential of the site, the nearshorephysical processes, and their effect on the underwater archaeological resources. The project outcomeshave shown that the establishment of an underwater archaeological park and diving sites at the culturalheritage sites will support cultural tourism development in the area and will have a positive impact onlocal socioeconomic development. The underwater archaeological park should comply with the basicprinciples of a site management plan – one that is established in the context of an integrated coastalmanagement plan that identifies the maritime synergies or conflicts among human activities, archaeo-logical resources, and the local environment, and utilises the 3D synthesis of marine knowledge from theproject outcomes as a decision-making tool.
Keywords: Maritime archaeology | Marine geophysics | Hydrography | Bathymetry | Site evolution | Underwater cultural heritage
مقاله انگلیسی
8 Reinforcement learning based adaptive power pinch analysis for energy management of stand-alone hybrid energy storage systems considering uncertainty
تقویت قدرت مبتنی بر یادگیری تقویتی برای مدیریت انرژی سیستمهای ذخیره انرژی ترکیبی مستقل با توجه به عدم اطمینان-2020
Hybrid energy storage systems (HESS) involve synergies between multiple energy storage technologies with complementary operating features aimed at enhancing the reliability of intermittent renewable energy sources (RES). Nevertheless, coordinating HESS through optimized energy management strategies (EMS) introduces complexity. The latter has been previously addressed by the authors through a systems-level graphical EMS via Power Pinch Analysis (PoPA). Although of proven efficiency, accounting for uncertainty with PoPA has been an issue, due to the assumption of a perfect day ahead (DA) generation and load profiles forecast. This paper proposes three adaptive PoPA-based EMS, aimed at negating load demand and RES stochastic variability. Each method has its own merits such as; reduced computational complexity and improved accuracy depending on the probability density function of uncertainty. The first and simplest adaptive scheme is based on a receding horizon model predictive control framework. The second employs a Kalman filter, whereas the third is based on a machine learning algorithm. The three methods are assessed on a real isolated HESS microgrid built in Greece. In validating the proposed methods against the DA PoPA, the proposed methods all performed better with regards to violation of the energy storage operating constraints and plummeting carbon emission footprint
Keywords: Hybrid energy storage systems | Energy management strategies | Model predictive control | Kalman filter | Reinforcement learning
مقاله انگلیسی
9 Assessment framework to develop and manage regional intermodal transport networks
چارچوب ارزیابی برای توسعه و مدیریت شبکه های حمل و نقل بین منطقه ای-2020
Freight intermodal transport hubs need to review long term plans considering the benefits and the cost (internal and external) in national or regional scale. The complexity of decision-making for the management of transportation infrastructures, mainly, is addressed to the variety of stakeholders with different expectations, prospects and limitations in terms of outputs over time. Therefore, at least in strategic level, the need to estimate the wider effects of the transport infrastructure development is essential and the analysis goes beyond what is normally captured in traditional cost-benefit analyses. This paper deals with the evaluation of the transportation projects socioeconomic effects according to the budget and business features of the project. Key objective is to define and quantify the overall contribution of a transport infrastructure project to an economic system during its lifecycle. Based on System of System concept, a series of KPIs introduced to review the performance of the project development in each economic system. The numerical application deals with the assessment of a cross-border transportation project, connecting the ports of Burgas (Bulgaria) and Alexandroupolis (Greece), stimulating new business opportunities in one of the lower income regions in Europe, by establishing a new freight transportation corridor from Black Sea to Southeast Mediterranean.
مقاله انگلیسی
10 تولید ضایعات و فاضلاب شهری در کمپ های پناهندگی اروپا: مورد لسووس، یونان
سال انتشار: 2019 - تعداد صفحات فایل pdf انگلیسی: 5 - تعداد صفحات فایل doc فارسی: 18
از سال 2015 جزیره لسووس (یونان) یک مکان ورودی کلیدی برای افرادی بوده است که به دنبال پناهندگی در اروپا هستند. این مقاله اطلاعاتی را درباره تولید ضایعات و فاضلاب جامد شهری در موریا و قارا تپه که مکان های پذیرش پناهنده ها هستند برای دوره زمانی بین می 216 تا آوریل 2017 ارائه می کند. برطبق نتایج به دست آمده، تولید سالانه ضایعات و فاضلاب شهری جامد در کمپ های پناهندگی به ترتیب برابر با 1464 تن و 95550 مترمکعب بوده است. با درنظر گرفتن میزان تولید انجام شده، میانگین سرانه روزانه تولید ضایعات جامد شهری به ازای هر پناهنده در هر روز برابر با 88/0 کیلوگرم بوده است که به صورت قابل توجهی پایین تر از میزان محاسبه شده برای جمعیت دائمی همین دوره زمانی می باشد (39/1 کیلوگرم به ازای هر ساکن در روز). تولید روزانه فاضلاب به ازای هر پناهنده در هر روز برابر با 54 لیتر بوده است درحالیکه مقدار متناظر با آن برای جمعیت دائمی برابر با 211 لیتر به ازای هر ساکن در هر روز می باشد. مقدار کل انتشار متان از تولید ضایعات و فاضلاب جامد شهری در کمپ های پناهندگی مطالعه شده برابر با 6/178 تن به ازای هر سال یا 5/35 کیلوگرم متان به ازای هر پناهنده در هر سال تخمین زده می شود. به منظور تضمین طراحی و عملکرد ماندگار این مکان ها، بررسی بیشتری برای شناسایی مشخصات ضایعات و فاضلاب جامد شهری تولید شده نیاز است.
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