检索结果-南通市图书馆

Novel Aspects of Constructal Law: Four Distinct and Competing Goals in Flow Channels design

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2021年第6期11卷 647-664页

作者： Luciano Ondir Freire delvonei alves de andrade Nuclear Engineering Center Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) S&#227 o Paulo Brazil

Constructal law explains the sense of evolution (morphing to get access to flows) of finite size systems, but paradoxes do exist as not all vegetables have a tree form. Also, nature does not improve all animals for displacement. This work aims at creating a model to explain those paradoxes about constructal law. It adopted the system engineering technique of segregation between functions (abstract goals) and solutions (physical entities). Further, this work introduced the assumptions of flow under external threats and imperfect channels (subject to leakages and suboptimal form). Results showed that there are always elements doing four functions in all types of channels: to reduce entropy, to protect channel, to retain integrity and to drive flow. Although the four functions are always present, natural systems typically privilege one function over others, depending on environmental demands. As a solution to improve flows, animal brains also fit in the model of four functions. Human mind seems to have groups of instincts associated with each of the four channel design functions, leading to four behavior phenotypes and four motivations (prominence, inclusiveness, negativity prevention and tradition). Finally, this model (channels need to meet four goals) unified physics and animal psychology and extended applications of Constructal law to the fields of systems engineering methods, management, and psychological science.

关键词： Constructal Law System Engineering Unifying Theory Animal design Gamification Human Centered design

Novel Technological developments with Impacts on Perspectives for Mobile Nuclear Power Plants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Nuclear Science and Technology 2021年第4期11卷 141-158页

作者： Luciano Ondir Freire delvonei alves de andrade Nuclear Engineering Center Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) S&#227 o Paulo Brazil

New research developments suggest that nuclear reactors using fusion may enter the market sooner than imagined even for mobile applications, like merchant ship propulsion and remote power generation. This article aims at pointing such developments and how they could affect nuclear fusion. The method is enumerating the main nuclear reactors concepts, identifying new technological or theoretical developments useful to nuclear field, and analysing how new recombination could affect feasibility of nuclear fusion. New technologies or experimental results do not always work the way people imagine, being better or worse for intended effects or even bringing completely unforeseen effects. Results point the following designs could be successful, in descending order of potential: aneutronic nuclear reactions using lattice confinement, aneutronic nuclear reactions using inertial along magnetic confinement, hybrid fission-lattice confinement fusion, and fission reactions.

关键词： Fusion Reactors Mobile Nuclear Power Plants Nuclear Reactors Nuclear Merchant Ships Clean Energy

Constructal Law of Institutions within Social Organizations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2018年第3期8卷 103-125页

作者： Luciano Ondir Freire delvonei alves de andrade Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) S&atilde o Paulo Brazil

This work looked for a unifying theory between physical-biological domain and social sciences. Constructal law unified physical and biological domain by telling the general sense in which flow systems tend to evolve. Management theory looks for relations between institutions and human agency. Although being state of mind entities, institutions follow constructal law. This work proposed the main organization flows are information and credit. Biologic instincts derived from Darwinian natural selection are the driving or blocking forces of such flows. Once biologic instincts systematically block information and credit flows in large numbers, this work proposed every human organization must have institutions to inhibit some behaviors. Those institutions need to be present, at least partially, in formal rules of social groups. This way it is possible to predict expansion or downfall of human groups using objective and quantifiable data. Therefore, further studies may employ classical history to confirm this theory. This work analyzed some case studies to show qualitatively the application of proposed theory. Concluding, this work gave physically-biologically grounded guidance for institutional changes.

关键词： Institutional Theory Institutional Entrepreneurship Unifying Theory Constructal Law Management Theory Social Systems

Technological Perspectives for Propulsion on Nuclear Attack Submarines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Nuclear Science and Technology 2018年第1期8卷 1-10页

作者： Rafael Radé Pacheco delvonei alves de andrade Nuclear and Energy Research Institute Instituto de Pesquisas Energéticas e Nucleares S&atilde o Paulo Brazil

This work aims to present the historical context in which the current understanding of the phenomenon of the direct contact condensation started to call the scientific society attention. The development of nuclear power plants Light Water Reactors demanded a safe way to collect and treat the water used to cool the reactor. Some characteristics of this water in a high energetic thermodynamic state made it unsuitable to be directly discharged in the atmosphere. Small room relieves tanks were developed to contain this discharge. These tanks were partially fulfilled with water, and the vapor injection created a vapor plume. In the interface of liquid and vapor, the thermal exchange would be increased by the characteristic turbulence of this region.

关键词： Direct Contact Condensation DCC Relief Tank Nuclear Power Plants Vapor Discharge

The Role of Nuclear Power from a System Engineering Standpoint

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Nuclear Science and Technology 2017年第3期7卷 167-188页

作者： Luciano Ondir Freire delvonei alves de andrade Nuclear and Energy Research Institute Instituto de Pesquisas Energéticas e Nucleares S&atilde o Paulo Brazil

This work proposed the application of system engineering methods to identify organizations vital for society, seeking development and well-being. System engineering requires the identification of blocks (or systems), identification of their service functions, identification of states, identification of required quality and identification of constraints. Analyzing modern societies, vital functions were identified and countries behavior was modeled, identifying their states. In this context, nuclear power was found to be fundamental for development and defense because of its inherent advantages for military naval purposes at war. Another striking conclusion is that nuclear power is the best solution for country energy security, more than to avoid climate changes, but to help the nation to resist climate changes. A solution to mitigate the high overnight costs of nuclear power was also proposed. It was demonstrated qualitatively that the adoption of dual purpose mobile nuclear power plants military performances, economic development and risks management.

关键词： System Engineering Nuclear Energy Energy Security Climate Changes Constructal Law PWR

Risk Communication and External Emergency Plan in Angra dos Reis, Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Nuclear Science and Technology 2016年第4期6卷 301-308页

作者： Raquel Dalledone Siqueira da Cunha delvonei alves de andrade Nuclear and Energy Research Institute Instituto de Pesquisas Energéticas e Nucleares/Universityof S&#226 o Paulo USP S&#226 o Paulo Brazil

The presence of a potentially hazardous facility in a community demands several safety procedures. Bringing risk communication among those actions may help the population that lives near the facility feel more confident and have the required knowledge on how to behave in an emergency situation. A research performed in Angra dos Reis, RJ, Brazil, where a nuclear power plant is located, shows that there is a lack of information and awareness about the emergency plan.

关键词： Risk Communication Emergency Plan Nuclear Power Plant

Relation between Gamma decomposition and Powder Formation of <i>γ</i>-U8Mo Nuclear Fuel Alloys via Hydrogen Embrittlement and Thermal Shock

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Nuclear Science and Technology 2014年第4期4卷 177-188页

作者： Fábio Branco Vaz de Oliveira delvonei alves de andrade Nuclear and Energy Research Institute IPEN-CNEN/SP Cidade Universitária S&atildeo Paulo Brazil

Gamma uranium-molybdenum alloys have been considered as the fuel phase in plate type fuel elements for material and test reactors (MTR), due to their acceptable performance under irradiation. Regarding their usage as a dispersion phase in aluminum matrix, it is necessary to convert the as cast structure into powder, and one of the techniques considered for this purpose is the hydration-dehydration (HDH). This paper shows that, under specific conditions of heating and cooling, γ-UMo fragmentation occurs in a non-reactive predominant mechanism, as shown by the curves of hydrogen absorption/desorption as a function of time and temperature. Our focus was on the experimental results presented by the addition of 8% weight molybdenum. Following the production by induction melting, samples of the alloys were thermally treated under a constant flow of hydrogen for temperatures varying from 500°C to 600°C and for times of 0.5 to 4 h. It was observed that, even without a massive hydration-dehydration process, the alloys fragmented under specific conditions of thermal treatment during the thermal shock phase of the experiments. Also, it was observed that there was a relation between absorption and the rate of gamma decomposition or the gamma phase stability of the alloy.

关键词： Nuclear Fuel Alloys Hydrogen Embrittlement Thermal Shock

Proposal of a Methodology for the Assessment of Security Levels of IoT Wireless Sensor Networks in Nuclear Environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Nuclear Science and Technology 2018年第2期8卷 78-85页

作者： Marcia Maria Savoine Mario Olimpio de Menezes delvonei alves de andrade Tocantinense University Center President Antonio Carlos—UNITPAC Tocantins Brazil Nuclear and Energy Research Institute S&atilde o Paulo Brazil

The use of Wireless Sensor Networks (WSN) associated with the reality of an Internet of Things (IoT) scenario in nuclear environments is a growing security concern. In this context, standards are intensified to preserve the physical integrity of these facilities considered to be highly critical due to the size of the impacts of safety accidents. This paper presents a proposal to build a methodology to evaluate the security levels of WSNs with IoT devices when used in nuclear areas. The proposal is initially based on related work to establish a more concrete initial framework and is structured in consistent steps from previous scientific studies.

关键词： Framework Internet of Things Methodology Security Wireless Sensor Network

The Future Role of the Nuclear Energy in Brazil in a Transition Energy Scenario

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and Power Engineering 2014年第13期6卷 496-506页

作者： Fábio Branco Vaz de Oliveira Kengo Imakuma delvonei alves de andrade Nuclear and Energy Research Institute Cidade Universit&#225 ria S&#227 o Paulo Brazil

This paper discusses and presents figures about the future power consumption in the world and, especially in Brazil, based on the current world and Brazilian’s energy scenarios. Emphasis is given to the scenarios of nuclear power and uranium resources demand. A discussion on the future roles of thorium and uranium fuels in the replacement of the traditional resources like oil and gas is also presented, as it is the role of the new nuclear power plants, planned to be built in a short term time horizon. This paper considers two different indexes for future projections, and the results obtained indicated a strong dependence on them. The time horizon for the analysis was fixed on the time estimated for Brazil to reach its maximum in population, and parameters evaluated were taken from the Brazilian’s governmental and world data on the population growth, energy consumption and energy consumption per capita. Calculations show that the power consumption projections for Brazil, for the adopted time horizon and working with global indexes, become overestimated, when compared with the results considering the national indexes. According to our approach, power consumption estimates using global indexes becomes approximately 4.5 times higher than the estimates presented by the Brazilian indexes. This was the motivation to the discussion between the Brazilian and world energy demand scenarios, and also the roles of nuclear energy in the future transition from the current conventional to alternative sources.

关键词： Nuclear Energy Renewables Future Energetic Resources Uranium Projections