scholarly journals Are Nano-Composite Coatings the Key for Photovoltaic Panel Self-Maintenance: An Experimental Evaluation

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3448 ◽  
Author(s):  
Simone Pedrazzi ◽  
Giulio Allesina ◽  
Alberto Muscio
Keyword(s):  
Large Scale ◽  
Composite Coatings ◽  
Electrical Energy ◽  
Photovoltaic Panel ◽  
Monitoring Campaign ◽  
Economical Analysis ◽  
Nano Coating ◽  
One Year ◽  
The Moment ◽  
The Cost

This article shows the influence of an anti-fouling nano-coating on the electrical energy produced by a string of photovoltaic modules. The coating effect was evaluated comparing the energy produced by two strings of the same PV power plant: one of them was cleaned and the other was cleaned and treated with the coating before the monitoring campaign. The PV plant is located in Modena, north of Italy. A first monitoring campaign of nine days after the treatment shows that the treatment increases the energy production on the PV arrays by about 1.82%. Results indicate that the increase is higher during sunny days with respect to cloudy days. A second monitoring campaign of the same length, but five months later, shows that the energy gain decreases from 1.82% to 0.69% due to the aging of the coating, which is guaranteed for one year by the manufacturer. A technical-economical analysis demonstrates that at the moment the yearly economic gain is 0.43 € per square meter of panel and the cost of the treatment is about 1 € per square meter. However, large scale diffusion can reduce the production cost and thus increase the affordability of the coating.

scholarly journals An Augmented Virtuality Based Solar Energy Power Calculator in Electrical Engineering

2015 ◽  
Vol 5 (1) ◽  
pp. 4 ◽  
Author(s):  
Clement Ehimika Ohireime Onime ◽  
James Uhomoibhi ◽  
Ermanno Pietrosemoli
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Solar Energy ◽  
Renewable Energy Sources ◽  
Electrical Energy ◽  
Photovoltaic Panel ◽  
Augmented Virtuality ◽  
Hands On ◽  
Electrical Engineers ◽  
The Cost

It is becoming increasingly important to include information about power generation from renewable energy sources in the training of electrical engineers. Solar energy is arguably the most common renewable energy source in use today. Providing practical hands-on training on solar energy power generation today requires the use of photovoltaic panel devices which are used for transforming solar energy into electrical energy. In many developing countries, practical hands-on training on solar power generation is limited due to the cost of photovoltaic panel devices and so the training consists of theoretical and tutorial classes sometimes supported by remote and virtual laboratories. This paper presents an augmented virtuality tool where real-time information from a mobile device’s sensors is used directly within a virtual or computer generated environment. The tool provides a practical context for hands-on tutorial exercises on solar energy power generation.

ANALYSIS OF CROP ROTATION SYSTEMS ORGANIZATION OF AGRICULTURAL COMPANIES OF TYUKALINSKY DISTRICT OF OMSK REGION ON THE LANDSCAPE AND ENVIRONMENTAL BASIS

2016 ◽  
Vol 11 (3) ◽  
pp. 24-30 ◽  
Author(s):  
Маракаева ◽  
Tatyana Marakaeva ◽  
Ноженко ◽  
Tatyana Nozhenko
Keyword(s):  
Large Scale ◽  
Arable Land ◽  
Ecological Condition ◽  
Crop Rotations ◽  
Organic Fertilizers ◽  
Ecological Stability ◽  
Agricultural Organizations ◽  
One Year ◽  
The Moment

Results of the three-year analysis of the organization of systems of crop rotations on a landscape and ecological basis in large-scale enterprises of Tyukalinsky district of the Omsk region are presented in article. In the territory of the agricultural organizations the assessment of ecological condition of lands on the basis of an assessment of the main components of a landscape was carried out: climatic, a relief, vegetation, soils, ground waters, the spreading breeds. It is established that in farms the following types of soils prevail: meadow, marsh, solonetzic soils, malt, meadow and chernozem solonetzic and chernozem and meadow solonetzic. Therefore, there are an average ecological intensity of lands in ООО “Atrachi” - 45.8%, ООО “Chistoe” - 58.9%, ООО “Agrokom” - 1%, and also strong manifestation of processes of remoistening and salinization is revealed (27%, 41,1% and 90% of the total area of an arable land in farms). Critical condition of arable lands is noted in ООО “Atrachi” (27.2%), at the moment they actually aren´t used and aren´t demanded. The analyzed agricultural organizations cultivate grain crops (24.7% - 41.0%), one-year (3.9%-21.4%) and long-term herbs (33.6% - 43.4%). In this regard two types of crop rotations are used: field and fodder. As a result of ecological justification of crop rotations, calculation of balance of a humus has shown that completion of its deficiency requires introduction of a certain amount of organic substances and implementation of replacement of a fallow land on sideralny with a zapakhivaniye of elevated mass of plants to the soil as additional organic fertilizers. After the carried-out analysis us it is recommended to include in crop rotations phytoameliorants, steady against salinization (the tributary white), to make replacement of long-term herbs on steady against remoistening of soils (a ribbon grass reed or a herd grass meadow). The use of correctly designed crop rotations, taking into account all complex of landscape and ecological conditions, will allow to stabilize negative natural and anthropogenous processes, to provide their big ecological stability.

scholarly journals Production experience and performance for ATLAS data processing on a Cray XC-50 at CSCS

2019 ◽  
Vol 214 ◽  
pp. 03023
Author(s):  
F G Sciacca ◽  
M Weber
Keyword(s):  
Data Processing ◽  
Particle Physics ◽  
Large Scale ◽  
Strategic Decision ◽  
Tier 2 ◽  
And Performance ◽  
One Year ◽  
Computational Resources ◽  
The Cost ◽  
Computing Models

Prediction for requirements for the LHC computing for Run 3 and for Run 4 (HL-LHC) over the course of the next 10 year, show a considerable gap between required and available resources, assuming budgets will globally remain flat at best. This will require some radical changes to the computing models for the data processing of the LHC experiments. The use of large scale computational resources at HPC centres worldwide is expected to increase substantially the cost-efficiency of the processing. In order to pave the path towards the HL-LHC data processing, the Swiss Institute of Particle Physics (CHIPP) has taken the strategic decision to migrate the processing of all the Tier-2 workloads for ATLAS and other LHC experiments from a dedicated x86 ̲ 64 cluster that has been in continuous operation and evolution since 2007, to Piz Daint, the current European flagship HPC, which ranks third in the TOP500 at the time of writing. We report on the technical challenges and solutions adopted to migrate to Piz Daint, and on the experience and measured performance for ATLAS in over one year of running in production.

scholarly journals Second ethical comments towards COVID-19 (one year later)

2021 ◽  
Vol 11 (1) ◽  
pp. 17-24
Author(s):  
O. I. Kubar ◽  
M. A. Bichurina ◽  
N. I. Romanenkova
Keyword(s):  
Large Scale ◽  
Social Trust ◽  
Vaccine Preventable Diseases ◽  
Ethical Content ◽  
Ethical Conflicts ◽  
The Face ◽  
One Year ◽  
The Stability ◽  
The Moment ◽  
Real Picture

At the beginning of COVID-19 development, when social vulnerability in the face of the global infectious threat became obvious, we presented target information on a key civilizational issue — the role of ethics in epidemic emergencies. The compliance of RF legislation and the world ethical standards analyzed on based on the study of the humanitarian heritage of pandemic management and a review of existing international documents. Today, one year later, it is time to practically evaluate the effectiveness of the ideology of ethical commitment and objectively comprehend the conflicts that have arisen, their causes and consequences. It should be emphasized that this work is not a so-called “moral lesson learned from COVID-19”, but representation of a real picture of how the centuries-old experience of former epidemics and pandemics was taken into account and the unique truth of the ethical content of management decisions and actions was accepted. It is particularly important to have a possibility to present this article as a continuation of our research topic on the bioethics of pandemics, on the pages of such an authoritative, specialized journal, which fully allows us to preserve the integrity of ideas about the humanitarian essence of anti-epidemic measures. This humanitarian parallel starts from the moment of managing a particular patient with infectious pathology until large-scale measures for eradication vaccine-preventable diseases. A comprehensive and dynamic look at the need to find ways and the nature of overcoming ethical conflicts during the ongoing pandemic of the new coronavirus infection could determine the ethical approach of longterm recommendations in the field of public health protection and ensure the stability of social trust in the future.

scholarly journals A Review on Self Cleaning and Tracking of Photovoltaic Panel

2021 ◽  
pp. 78-85
Author(s):  
Adithya P ◽  
Harsha Awate ◽  
Nikitha L ◽  
Vidhyashree H S ◽  
P Praveen
Keyword(s):  
Natural Resources ◽  
Large Scale ◽  
Electrical Energy ◽  
Solar Panel ◽  
Energy Output ◽  
Small Scale ◽  
The Sun ◽  
Solar Panels ◽  
Photovoltaic Panel ◽  
Pv Module

Solar panels are used to convert the energy from sunlight to electrical energy. The different impacts on the solar panel which influences the productivity of the solar panel are Sun movement and dirt which generate the fundamental impact on solar panel. Because of those impacts, less yield generated by solar panel so to increase the effectiveness of the solar panel is by utilizing tracking and cleaning technique. There is a framework which is mix of tracking and cleaning. In this cutting-edge world, power is likewise added to the most fundamental requirements in everybody's day to day existence. With the expanding request of power, destruction of the natural resources is done and will be used for energy generation. To adjust the shortage of natural resources unconventional fuels are used for power generation and are used by the most part of world. Among all the unconventional fuel sources, power created by solar panel energy is broadly utilized. The abundancy of this type of energy is more all around the earth. A framework which tracks sun as well as automatic washing of solar panel with automated instructions is required. The instrument requires a LDR for following the sun and for cleaning wiper module is required. Regarding every day energy production, the sun tracking - cum cleaning plan gives more energy output when contrasted with the fixed PV module. Without this framework this cleaning work is done by man force which is good for small scale but for large scale like power plant it is very difficult. Then led display is required to display the result of the framework.

scholarly journals Modular Multilevel Converters for Large-Scale Grid-Connected Photovoltaic Systems: A Review

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6213
Author(s):  
Saud Alotaibi ◽  
Ahmed Darwish
Keyword(s):  
Energy Demand ◽  
Power Plants ◽  
Large Scale ◽  
Control Strategies ◽  
Electrical Energy ◽  
Solar Pv ◽  
Pv Systems ◽  
Point Tracking ◽  
Power Point ◽  
One Year

The use of photovoltaic (PV) systems as the energy source of electrical distributed generators (DG) is gaining popularity, due to the progress of power electronics devices and technologies. Large-scale solar PV power plants are becoming the preferable solution to meet the fast growth of electrical energy demand, as they can be installed in less than one year, as compared to around four years in the case of conventional power plants. Modular multilevel inverters (MMIs) are the best solution to connect these large-scale PV plants to the medium-voltage (MV) grid, due to their numerous merits, such as providing better power quality, having higher efficiency, providing better reliability, and their scalability. However, MMIs are still progressing and need some improvement before they can be implemented safely in the industrial, medium, and high voltage networks. The main purpose of this paper is to review the present MMIs topologies when used in PV applications. The review aims to present a comprehensive study of the various recent submodule circuits associated with MMI topologies. Maximum power point tracking (MPPT) control schemes for PV inverters will be explored extensively. Then, the different control strategies of PV MMIs will be presented and compared to give a holistic overview of the submodules balancing techniques, ranges, and capabilities under balanced and unbalanced grid conditions. In addition, the paper will discuss the future of PV MMIs systems in electricity networks.

scholarly journals An Evaluation of Online Proctoring Tools

Open Praxis ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 509
Author(s):  
Mohammed Juned Hussein ◽  
Javed Yusuf ◽  
Arpana Sandhya Deb ◽  
Letila Fong ◽  
Som Naidu
Keyword(s):  
Online Learning ◽  
Large Scale ◽  
Learning Technologies ◽  
Educational Institutions ◽  
Learning And Teaching ◽  
Technical Requirements ◽  
Private Location ◽  
The Moment ◽  
The Cost ◽  
The University

COVID’19 is hastening the adoption of online learning and teaching worldwide, and across all levels of education. While many of the typical learning and teaching transactions such as lecturing and communicating are easily handled by contemporary online learning technologies, others, such as assessment of learning outcomes with closed book examinations are fraught with challenges. Among other issues to do with students and teachers, these challenges have to do with the ability of teachers and educational organizations to ensure academic integrity in the absence of a live proctor when an examination is being taken remotely and from a private location. A number of online proctoring tools are appearing on the market that portend to offer solutions to some of the major challenges. But for the moment, they too remain untried and tested on any large scale. This includes the cost of the service and their technical requirements. This paper reports on one of the first attempts to properly evaluate a selection of these tools and offer recommendations for educational institutions. This investigation, which was carried out at the University of the South Pacific, comprised a four-phased approach, starting with desk research that was followed with pilot testing by a group of experts as well as students. The elimination of a tool in every phase was based on the ‘survival of the fittest’ approach with each phase building upon the milestones and deliverables from the previous phase. This paper presents the results of this investigation and discusses its key findings.

Case Studies of Distributed Generation Projects With Microturbines in Brazil

2003 ◽  
Author(s):  
Eli Eber Batista Gomes ◽  
Marco Antoˆnio Rosa do Nascimento ◽  
Electo Eduardo Silva Lora
Keyword(s):  
Natural Gas ◽  
Distributed Generation ◽  
Large Scale ◽  
High Reliability ◽  
Payback Period ◽  
Economical Analysis ◽  
Energy Company ◽  
Cogeneration System ◽  
Generation Costs ◽  
The Cost

Microturbines have showed good perspectives for the distributed generation of the electricity in low capacity range, because they have high reliability and simple design (high potential for a cheap manufacture and in large scale). Besides, this technology must have a great application in systems of cogeneration of the public service (malls, hotel, hospital, etc.) and in the distributed generation of the electricity in the developing countries in order to get a reliable operation system, in a range of power compatible with the isolated communities. In Brazil, The Thermal Systems Study Group (NEST) of Federal University of Itajuba´ (UNIFEI) sponsored by The Energy Company of Minas Gerais (CEMIG), are developing a project of experimental valuation of the system with microturbines for electricity generation fueled with natural gas and diesel. The objective of this paper is to show an economic evaluation which presents the generation costs and the payback period with the Capstone 30 kW natural gas microturbines business in three cases: microturbines operating on base load in gas station, microturbines operating on peak shave in the industry and a microturbine cogeneration system operating in the residential segment. It was considered the cost of microturbines at this moment and the projection for the future, as well as the cost of electricity and natural gas in Brazil. An economical analysis was carried out for different variables involved and the results show the Capstone 30 kW natural gas microturbines business are feasible firstly in cogeneration cases which is possible to get until 3 years of payback period. Besides, the return on the investment have shown improvements with the incentive of the natural gas distributing companies and with the rises in the electricity price of Brazilian utilities.

scholarly journals Green Hydrogen Value Chain in the Sustainability for Port Operations: Case Study in the Region of Valparaiso, Chile

2021 ◽  
Vol 13 (24) ◽  
pp. 13681
Author(s):  
Yunesky Masip Macía ◽  
Pablo Rodríguez Machuca ◽  
Angel Alexander Rodríguez Soto ◽  
Roberto Carmona Campos
Keyword(s):  
Fuel Cell ◽  
Value Chain ◽  
Energy Demand ◽  
Large Scale ◽  
Electrical Energy ◽  
Diesel Generator ◽  
Cost Of Energy ◽  
Main Components ◽  
The Cost ◽  
Port Facility

The paper presents a complete value chain for the use of green hydrogen in a port facility. The main objective was to propose the sizing of the main components that make up green hydrogen to ensure the supply of 1 MWe in replacing the diesel generator. The energy demand required for the port was determined by establishing the leading small and large-scale conventional energy-consuming equipment. Hence, 60 kgH2 was required to ensure the power supply. The total electrical energy to produce all the hydrogen was generated from photovoltaic solar energy, considering three-generation scenarios (minimum, maximum and the annual average). In all cases, the energy supply in the electrolyzer was 3.08 MWe. In addition, the effect of generating in the port facility using a diesel generator and a fuel cell was compared. The cost of 1 kgH2 could be 4.09 times higher than the cost of 1 L of diesel, meaning that the output kWh of each system is economically similar. In addition, the value of electrical energy through a Power Purchase Agreement (PPA) was a maximum of 79.79 times the value of a liter of diesel. Finally, the Levelized Cost of Energy (LCOE) was calculated for two conditions in which the MWe was obtained from the fuel cell without and with the photovoltaic solar plant.

Sonographically guided, transcatheter foam sclerotherapy of the great saphenous vein

Phlebologie ◽  
2007 ◽  
Vol 36 (06) ◽  
pp. 309-312 ◽  
Author(s):  
T. Schulz ◽  
M. Jünger ◽  
M. Hahn
Keyword(s):  
Saphenous Vein ◽  
Great Saphenous Vein ◽  
Clinical Stage ◽  
Clinical Signs ◽  
Cost Effective ◽  
Duplex Sonography ◽  
Foam Sclerotherapy ◽  
Average Loss ◽  
One Year ◽  
The Cost

Summary Objective: The goal of the study was to assess the effectiveness and patient tolerability of single-session, sonographically guided, transcatheter foam sclerotherapy and to evaluate its economic impact. Patients, methods: We treated 20 patients with a total of 22 varicoses of the great saphenous vein (GSV) in Hach stage III-IV, clinical stage C2-C5 and a mean GSV diameter of 9 mm (range: 7 to 13 mm). We used 10 ml 3% Aethoxysklerol®. Additional varicoses of the auxiliary veins of the GSV were sclerosed immediately afterwards. Results: The occlusion rate in the treated GSVs was 100% one week after therapy as demonstrated with duplex sonography. The cost of the procedure was 207.91 E including follow-up visit, with an average loss of working time of 0.6 days. After one year one patient showed clinical signs of recurrent varicosis in the GSV; duplex sonography showed reflux in the region of the saphenofemoral junction in a total of seven patients (32% of the treated GSVs). Conclusion: Transcatheter foam sclerotherapy of the GSV is a cost-effective, safe method of treating varicoses of GSV and broadens the spectrum of therapeutic options. Relapses can be re-treated inexpensively with sclerotherapy.

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