scholarly journals Low-Cost Solar Electricity Using Stationary Solar Fields; Technology Potential and Practical Implementation Challenges to Be Overcome. Outcomes from H2020 MOSAIC Project

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1816
Author(s):  
Cristóbal Villasante ◽  
Saioa Herrero ◽  
Marcelino Sánchez ◽  
Iñigo Pagola ◽  
Adrian Peña ◽  
...  
Keyword(s):  
Low Cost ◽  
Lessons Learned ◽  
Practical Implementation ◽  
Spherical Mirror ◽  
The Sun ◽  
Implementation Challenges ◽  
Under Construction ◽  
Mobile Receiver ◽  
Solar Electricity ◽  
The Cost

At any time of the day, a spherical mirror reflects the rays coming from the sun along a line that points to the sun through the center of the sphere. This makes it possible to build concentrated solar power(CSP) plants with fixed solar fields and mobile receivers; that is, solar fields can be significantly cheaper and simpler, but challenging tracking systems for the mobile receiver need to be implemented. The cost-cutting possibilities for this technology have been under-researched. This article describes the MOSAIC concept, which aims to achieve low-cost solar energy by boosting the benefits of spherical reflectors while addressing their challenges. This new concept proposes to build large modular plants from semi-Fresnel solar bowls. One of these modules has been designed and is under construction in Spain. This article reports the main lessons learned during the design phase, describes the advantages and challenges of the concept, details the proposed routes to overcome them, and identifies the steps needed to develop a fully competitive industrial solution.

scholarly journals In situ recombination junction between p-Si and TiO2enables high-efficiency monolithic perovskite/Si tandem cells

2018 ◽  
Vol 4 (12) ◽  
pp. eaau9711 ◽  
Author(s):  
Heping Shen ◽  
Stefan T. Omelchenko ◽  
Daniel A. Jacobs ◽  
Sisir Yalamanchili ◽  
Yimao Wan ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Atomic Layer ◽  
Optical Losses ◽  
Layer Deposition ◽  
Solar Electricity ◽  
The Cost ◽  
Recombination Junction ◽  
Processing Steps

Increasing the power conversion efficiency of silicon (Si) photovoltaics is a key enabler for continued reductions in the cost of solar electricity. Here, we describe a two-terminal perovskite/Si tandem design that increases the Si cell’s output in the simplest possible manner: by placing a perovskite cell directly on top of the Si bottom cell. The advantageous omission of a conventional interlayer eliminates both optical losses and processing steps and is enabled by the low contact resistivity attainable between n-type TiO2and Si, established here using atomic layer deposition. We fabricated proof-of-concept perovskite/Si tandems on both homojunction and passivating contact heterojunction Si cells to demonstrate the broad applicability of the interlayer-free concept. Stabilized efficiencies of 22.9 and 24.1% were obtained for the homojunction and passivating contact heterojunction tandems, respectively, which could be readily improved by reducing optical losses elsewhere in the device. This work highlights the potential of emerging perovskite photovoltaics to enable low-cost, high-efficiency tandem devices through straightforward integration with commercially relevant Si solar cells.

scholarly journals СОВЕРШЕНСТВОВАНИЕ ГИДРОМЕЛИОРАТИВНЫХ МАШИНС  АВТОМАТИЗАЦИЕЙ ПРОЦЕССА ПОЛИВА

2019 ◽  
Author(s):  
A. Akhtyamov ◽  
A. Ryazantsev ◽  
O. Gavrilina ◽  
A. Boyko ◽  
S. Borychev ◽  
...  
Keyword(s):  
Low Cost ◽  
Economic Effect ◽  
Hydraulic Drive ◽  
Cost Savings ◽  
Practical Implementation ◽  
High Productivity ◽  
Low Degree ◽  
The Cost ◽  
Positive Results ◽  
Horizontal Arrangement

Целью исследования являлось теоретическое обоснование и практическая реализация нового способа полива гидромелиоративной машиной Фрегат с гидроприводом на сложном рельефе с минимальными затратами на модернизацию и энергозатратами. Объектом исследования является экспериментальный кранзадатчик скорости, устанавливаемый на гидромелиоративную машину. Исследования проводились в сравнении с показателями машин серийного производства. В ходе исследования было установлено, что существующая технология полива не отвечает необходимым требованиям гидромелиорации и имеет низкую степень экономической эффективности. Предлагаемая технология полива решает вопрос неравномерного распределения влаги по площади, повышает урожайность и снижает стоимость обслуживания машины вследствие уменьшения числа поломок. Имеющиеся модернизации дождевальной машины (ДМ) Фрегат , позволяющие работать по предлагаемой технологии, сложны по конструкции, ненадежны и имеют относительно высокую стоимость модернизации и сезонного обслуживания. С целью увеличения экономии средств и упрощения процесса модернизации серийных машин был разработан и протестирован кранзадатчик скорости, позволяющий снизить риск эрозии почв, застревания колес тележек и, тем самым, простой машины с необходимостью ее ремонта. Главной особенностью экспериментального краназадатчика скорости является его горизонтальное расположение относительно тележки. Два плеча с увеличенной длиной позволяют задавать поливную норму путем касания вех в начале каждого сектора, где необходимо сменить скорость движения машины. Таким образом, происходит регулирование поливной нормы, выдаваемой машиной при ее движении по орошаемой площади. Получившийся экономический эффект позволяет утверждать о положительных результатах в проведенных исследованияхThe aim of the research is the theoretical justification and practical implementation of the new method of irrigation irrigation and drainage machines Frigat with hydraulic drive for complex tasks of modernization and energy consumption. The object of the study is an experimental speedadjusting crane installed on a water reclamation machine. The studies were conducted in comparison with indicators of machine production. In the course of research it was found that the existing technology does not meet the requirements of irrigation and drainage and has a low degree of economic efficiency. The issue of uneven distribution of the owner by area, high productivity and low cost of maintenance is being addressed. DM Frigat, which allows you to work on the proposed technologies, does not require the cost of modernization and seasonal maintenance. In order to increase cost savings and develop new models of machines, a speed control crane has been developed and tested to reduce the risk of machine destruction. The operation of the trolley is the horizontal arrangement of the trolley. The speed of the machine can be increased. Thus, regulation of the irrigation rate occurs. The resulting economic effect allows us to argue about the positive results in the studies

scholarly journals Design and Development of Low-Cost Solar Electricity Generation System with Heliostat to Ensure the Optimum Uses of Rated Capacity of Solar Cells

2020 ◽  
pp. 113-116
Keyword(s):  
Flat Plate ◽  
Electricity Generation ◽  
Large Scale ◽  
Tracking System ◽  
Low Cost ◽  
Low Grade ◽  
The Sun ◽  
Solar Panels ◽  
Generation System ◽  
Solar Electricity

Almost all solar electricity generation systems are now operated with flat plate solar panels. These flat plate solar panels have a lot of expensive collector area although still deliver only low-grade temperature which is a boundless problem for assuring the optimum uses of the rated capacity of solar panels. Using heliostats can reduce this problem significantly. Heliostats consist of a single or a set of mirrors that track the sun’s position and reflect the sun rays into a central receiving point. With the movement of the sun, these mirrors are adjusted accordingly to track the sun to ensure the highest amount of sunlight reflected onto the same collection point. The system is cheaper than any other solar tracking system presently used in our country. This paper describes an improved design of a solar electricity generation system having a capacity of 1Wp with heliostats on an experimental basis. It will also demonstrate a comparison of a generation of a 1Wp solar system with and without heliostats. Successful outcomes of this experiment will lead us to implement the heliostats-based tracking system into the large-scale solar electricity generation systems.

scholarly journals MANUFACTURING TECHNIQUES OF LOW-COST SI-BASED CRYSTALLINE TYPE SOLAR CELL IN BANGLADESH

2013 ◽  
Vol 42 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Md. Shafiqul Islam ◽  
Md. Rakibul Hasan ◽  
Fariba Mohammadi ◽  
Antara Majumdar ◽  
Ali Ahmad
Keyword(s):  
Solar Cells ◽  
Solar Energy ◽  
Alternative Energy ◽  
Raw Materials ◽  
Low Cost ◽  
Atomic Energy Commission ◽  
Cost Effective ◽  
The Sun ◽  
Solar Panels ◽  
The Cost

In today’s world with the increasing population, the world's energy needs are growing steadily andthe crisis for power is also increasing. All the conventional sources of energy like gas, coal, oil etc are limited.In this situation, the need for establishing a renewable energy source as an alternative energy generation systemhas become very important for sustainable energy security of the country. Among various renewable energysources, solar energy comprises a large portion. The solar energy captivated by Earth’s atmosphere, oceansand land is about 385000 EJ[1]. But only less than 1% of useful energy comes from solar power [2]. Thisstatistics shows that, the sun shine produces 35000 times more power on earth than the daily power productionusing solar energy. Thus the earth receives more energy from the sun in just one hour than the world uses in awhole year.[3] The conversion of sunlight into electricity using solar cells system (10-14%) is worthwhile way ofproducing this alternative energy. Bangladesh receives strong sunshine throughout the whole year (3.8-6.42Kw-hr/m2) and it has been found that the average sunshine hours are 6.69, 6.16 and 4.81in winter, summer andmonsoon, respectively.[4] Bangladesh is also adopting means to use solar energy day by day. Many privateCompanies in Bangladesh import solar panels from abroad and sell them into the country. The approximatecost for importing readymade panels varies from 90-98 BDT per Wp. There are some companies which importsolar cells from foreign countries and assemble them into panels. The average cost for importing cells isapproximately 41-57 BDT per Wp. The cost of assembled panels from imported cells is approximately 78-84BDT per Wp. From the analysis it is found that, the cost of a locally produced PV panel is 10 percent lower thanimported ones [5] because of 60% cost incurs for producing cells from raw materials. Although solar panels arebeing produced in Bangladesh, till now solar cells have not been fabricated yet. In Bangladesh for the first time‘Bangladesh Atomic Energy Commission (BAEC)’ is going to set up a laboratory to fabricate crystalline solarcells. It is anticipated that producing cells from raw materials locally and then assembling them into PV panelswill reduce the cost almost 30%. This paper explores how fabricating crystalline solar cells locally isanticipated to reduce cost of solar panels. If the cost effective technology could be made familiar in Bangladeshthen it would help in solving our power crisis in a great deal.DOI: http://dx.doi.org/10.3329/jme.v42i1.15934

scholarly journals AAU-BOT1: A Platform for Studying Dynamic, Life-Like Walking

2009 ◽  
Vol 6 (3-4) ◽  
pp. 285-299 ◽  
Author(s):  
Mads Sølver Svendsen ◽  
Jan Helbo ◽  
Michael Rygaard Hansen ◽  
Dejan B. Popovic ◽  
Jakob Stoustrup ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Humanoid Robot ◽  
Low Cost ◽  
Design Parameters ◽  
Practical Implementation ◽  
Joint Torques ◽  
Motion Data ◽  
Department Of Health ◽  
Development Costs ◽  
The Cost

This paper describes the development of the humanoid robot AAU-BOT1. The purpose of the robot is to investigate human-like walking and in this connection, test prosthetic limbs. AAU-BOT1 has been designed with modularity in mind making it possible to replace, e.g. the lower leg to test transfemoral or transtibial prosthesis or orthosis. Recorded motion data from a male test person, along with approximated inertial and mass properties, were used to determine necessary joint torques in human walking which was used as design parameters for the robot. The robot has 19 degrees of freedom (DoF), 17 actuated and 2 unactuated acting as passive toe joints. The project was granted 60,000 Euro, and to keep development costs below this, the development and instrumentation was carried out by three groups of master students from the Department of Mechanical Engineering (ME) and the Department of Electronic Systems at Aalborg University and supported by the Department of Health Sciences and Technology (HST). To further reduce the cost, the robot uses off-the-shelf hardware which also reduced the time from idea to practical implementation. The result is a low-cost humanoid robot fully assembled and equipped with sensors ready to take its first steps.

scholarly journals 6G Opportunities Arising from Internet of Things Use Cases: A Review Paper

2021 ◽  
Vol 13 (6) ◽  
pp. 159
Author(s):  
Basel Barakat ◽  
Ahmad Taha ◽  
Ryan Samson ◽  
Aiste Steponenaite ◽  
Shuja Ansari ◽  
...  
Keyword(s):  
Wireless Networks ◽  
Internet Of Things ◽  
Future Generation ◽  
Lessons Learned ◽  
Use Cases ◽  
Practical Implementation ◽  
Implementation Challenges ◽  
Novel Approach ◽  
Big Picture ◽  
The Internet Of Things

The race for the 6th generation of wireless networks (6G) has begun. Researchers around the world have started to explore the best solutions for the challenges that the previous generations have experienced. To provide the readers with a clear map of the current developments, several review papers shared their vision and critically evaluated the state of the art. However, most of the work is based on general observations and the big picture vision, and lack the practical implementation challenges of the Internet of Things (IoT) use cases. This paper takes a novel approach in the review, as we present a sample of IoT use cases that are representative of a wide variety of its implementations. The chosen use cases are from the most research-active sectors that can benefit from 6G and its enabling technologies. These sectors are healthcare, smart grid, transport, and Industry 4.0. Additionally, we identified some of the practical challenges and the lessons learned in the implementation of these use cases. The review highlights the cases’ main requirements and how they overlap with the key drivers for the future generation of wireless networks.

Advance Protection for Three Phase Induction Motor using Microcontroller Atmega32

2018 ◽  
Vol 8 (1) ◽  
pp. 172
Author(s):  
Karan S Belsare ◽  
Gajanan D Patil
Keyword(s):  
Induction Motor ◽  
Low Cost ◽  
Short Circuit ◽  
Cost Factor ◽  
Protection Scheme ◽  
Three Phase ◽  
The Cost

A low cost and reliable protection scheme has been designed for a three phase induction motor against unbalance voltages, under voltage, over voltage, short circuit and overheating protection. Taking the cost factor into consideration the design has been proposed using microcontroller Atmega32, MOSFETs, relays, small CTs and PTs. However the sensitivity of the protection scheme has been not compromised. The design has been tested online in the laboratory for small motors and the same can be implemented for larger motors by replacing the i-v converters and relays of suitable ratings.

Janus – A New Approach to Air Combat Pilot Training

2019 ◽  
Vol 2019 (4) ◽  
pp. 7-22
Author(s):  
Georges Bridel ◽  
Zdobyslaw Goraj ◽  
Lukasz Kiszkowiak ◽  
Jean-Georges Brévot ◽  
Jean-Pierre Devaux ◽  
...  
Keyword(s):  
Low Cost ◽  
Cost Effective ◽  
High Energy ◽  
Training System ◽  
Embedded Sensors ◽  
Pilot Training ◽  
New Approach ◽  
Combat Aircraft ◽  
Air Combat ◽  
The Cost

Abstract Advanced jet training still relies on old concepts and solutions that are no longer efficient when considering the current and forthcoming changes in air combat. The cost of those old solutions to develop and maintain combat pilot skills are important, adding even more constraints to the training limitations. The requirement of having a trainer aircraft able to perform also light combat aircraft operational mission is adding unnecessary complexity and cost without any real operational advantages to air combat mission training. Thanks to emerging technologies, the JANUS project will study the feasibility of a brand-new concept of agile manoeuvrable training aircraft and an integrated training system, able to provide a live, virtual and constructive environment. The JANUS concept is based on a lightweight, low-cost, high energy aircraft associated to a ground based Integrated Training System providing simulated and emulated signals, simulated and real opponents, combined with real-time feedback on pilot’s physiological characteristics: traditionally embedded sensors are replaced with emulated signals, simulated opponents are proposed to the pilot, enabling out of sight engagement. JANUS is also providing new cost effective and more realistic solutions for “Red air aircraft” missions, organised in so-called “Aggressor Squadrons”.

scholarly journals Pocket MUSE: an affordable, versatile and high-performance fluorescence microscope using a smartphone

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yehe Liu ◽  
Andrew M. Rollins ◽  
Richard M. Levenson ◽  
Farzad Fereidouni ◽  
Michael W. Jenkins
Keyword(s):  
High Performance ◽  
Point Of Care ◽  
Low Cost ◽  
Consumer Electronics ◽  
Practical Implementation ◽  
The Novel ◽  
Point Of Care Diagnostics ◽  
Optical Module ◽  
Optical Configuration ◽  
User Friendly

AbstractSmartphone microscopes can be useful tools for a broad range of imaging applications. This manuscript demonstrates the first practical implementation of Microscopy with Ultraviolet Surface Excitation (MUSE) in a compact smartphone microscope called Pocket MUSE, resulting in a remarkably effective design. Fabricated with parts from consumer electronics that are readily available at low cost, the small optical module attaches directly over the rear lens in a smartphone. It enables high-quality multichannel fluorescence microscopy with submicron resolution over a 10× equivalent field of view. In addition to the novel optical configuration, Pocket MUSE is compatible with a series of simple, portable, and user-friendly sample preparation strategies that can be directly implemented for various microscopy applications for point-of-care diagnostics, at-home health monitoring, plant biology, STEM education, environmental studies, etc.

scholarly journals A low-cost wireless endoscope camera: a preliminary report

2021 ◽  
Vol 27 (1) ◽  
Author(s):  
J. M. Lazarus ◽  
M. Ncube
Keyword(s):  
Minimally Invasive Surgery ◽  
Minimally Invasive ◽  
Video Transmission ◽  
Low Cost ◽  
Battery Life ◽  
Resource Constrained ◽  
High Definition ◽  
Industry Standard ◽  
Constrained Environments ◽  
The Cost

Abstract Background Technology currently used for surgical endoscopy was developed and is manufactured in high-income economies. The cost of this equipment makes technology transfer to resource constrained environments difficult. We aimed to design an affordable wireless endoscope to aid visualisation during rigid endoscopy and minimally invasive surgery (MIS). The initial prototype aimed to replicate a 4-mm lens used in rigid cystoscopy. Methods Focus was placed on using open-source resources to develop the wireless endoscope to significantly lower the cost and make the device accessible for resource-constrained settings. An off the shelf miniature single-board computer module was used because of its low cost (US$10) and its ability to handle high-definition (720p) video. Open-source Linux software made monitor mode (“hotspot”) wireless video transmission possible. A 1280 × 720 pixel high-definition tube camera was used to generate the video signal. Video is transmitted to a standard laptop computer for display. Bench testing included latency of wireless digital video transmission. Comparison to industry standard wired cameras was made including weight and cost. The battery life was also assessed. Results In comparison with industry standard cystoscope lens, wired camera, video processing unit and light source, the prototype costs substantially less. (US$ 230 vs 28 000). The prototype is light weight (184 g), has no cables tethering and has acceptable battery life (of over 2 h, using a 1200 mAh battery). The camera transmits video wirelessly in near real time with only imperceptible latency of < 200 ms. Image quality is high definition at 30 frames per second. Colour rendering is good, and white balancing is possible. Limitations include the lack of a zoom. Conclusion The novel wireless endoscope camera described here offers equivalent high-definition video at a markedly reduced cost to contemporary industry wired units and could contribute to making minimally invasive surgery possible in resource-constrained environments.

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