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The energy from sugarcane is one of the most important in Brazil’s energy matrix and the efficiency of extraction and processing is fully dependent on the quality of the raw material. The soil present in sugarcane was investigate here as a factor that can affect the production of energy. Chemical elements (Fe, Hf, Sc and Th) determined by instrumental neutron activation analysis were used for tracing soil in sugarcane and its derived bagasse. The lower calorific value (LCV) of bagasse demonstrated a good negative correlation (r = −0.9727) with the ash content of the bagasse, which in turn was positively correlated to the amount of soil in the sugarcane. Therefore, the presence of soil reduces the production of energy from burning bagasse. The proportion of loss in the LCV was just slightly higher than the soil content, i.e. for an soil content of 10 % a reduction of 12.7 % was observed in the LCV.

At present, just 40% of Nigeria’s populace is associated with the energy matrix, while power supply challenges are capable around 60% of the time. In the best-case scenario, the regular everyday power supply in Nigeria is assessed at four hours, albeit a few days can pass by with no force by any means. Neither force cuts nor reclamations are reported; prompting requires a heap shedding plan during the COVID-19 lockdowns to help reasonable conveyance and consistency. To address this issue, this paper proposes energy harvesting technologies to the epileptics power supply in Nigeria. The technology was chosen as proven efficient and reliable in many studies as an alternative and reliable power generation source. It is also largely maintenance-free and environmentally friendly, and powers hardware where there are no ordinary force sources, and ultimately, it wipes out the requirement for continuous battery substitutions and running wires to end applications. The paper was written in sections: Introduction; Power Supply in Nigeria; Current Situation in the Power Sector; Overview of Energy Harvesting Technology; Application Area of Energy Harvesting; and Solution to Epileptic Power Supply in Nigeria. Lastly, a concise conclusion and a list of relevant references were presented.

This paper explores how Turkey’s politics and economy are affected by changes in global energy. To define which are the most relevant developments, the paper opens with an overview of the country's economic landscape. This analysis illustrates that energy, being the key driver behind its large current account deficit, represents a major point of vulnerability for the country. On this basis, the paper illustrates Turkey's energy matrix, an analysis that outlines the rising role of gas in the country's energy sector, both under the internal (i.e. growing share of the mix) and external (i.e. the country's potential role as regional gas hub) points of view. Finally, these issues are discussed with the aim of assessing the prospects for Turkey to turn gas into a geopolitical and economic asset for the country.

It has been very significant to visualize time series big data. In the paper we shall discuss a new analysis method called "statistical shape analysis" or "geometry driven statistics" on time series statistical data in economics. In the paper, we analyse the agriculture, value added and industry, value added (percentage of GDP) changes from 2000 to 2010 in Asia. We handle the data as a set of landmarks on a two-dimensional image to see the deformation using the principal components. The point of the analysis method is the principal components of the given formation which are eigenvectors of its bending energy matrix. The local deformation can be expressed as the set of non-Affine transformations. The transformations give us information about the local differences between in 2000 and in 2010. Because the non-Affine transformation can be decomposed into a set of partial warps, we present the partial warps visually. The statistical shape analysis is widely used in biology but, in economics, no application can be found. In the paper, we investigate its potential to analyse the economic data.

The global energy production reflects an excessive percentage of non-renewable energy. Therefore, a great volume of investment on renewable energy became a serious matter in order to mitigate the damage caused by the consumption of energy from fossil sources. On the other hand, Brazil’s oil companies are living a decisive moment in terms of investments in energy bases, because there is a great demand for capital resources to develop the latest discoveries of enormous non-renewable supplies. In this context, this paper describes the impact of the projects announced by the oil and gas industries in the Brazilian energy matrix. The data comes from the plans presented by the major oil companies that operate in Brazil basins, mainly in pre-salt region, and from reports published by EPE (Energy Research Company – Government of Brazil). This work involves projections from 2011 to 2020 and it was made assuming three global economic scenarios: recession, stability and economic growth. Projections are treated in a comprehensive knowledge by a simple econometric model and based on the investments announced by the oil industry of the country. Studies take into account the fossil and renewable energy projections under assumptions from the Ten Year Plan for Energy Expansion in 2020 produced by the National Council for Energy Policy (CNPE, in the Portuguese-language acronym). The results indicate viable economic projects in the renewable energy for the Brazilian oil and gas companies (energy corporations), primarily biofuels, wind and solar power, in the expense of some oil production projects in their portfolios. Brazil is experiencing a great time to develop the renewable energy sources that is made by other countries and if these changes accelerate, it will be the potential to improve its economy by creating millions of jobs. As main conclusion, the decisions on investment in renewable energy with capital acquired from the pre-salt projects will determine the future of the Brazilian energy matrix. The main goal of this paper is to indicate a transition to a cleaner energy matrix considering an alternative investment plan, and show some fundamental concepts to illustrate how the renewable energy can be important for the oil and gas companies’ subsistence in the next generations.

This paper reports a theoretical calculation of spin-Hamiltonian parameters ( g factors g // , g ⊥ and hyperfine structure constants 147 A // , 147 A ⊥ , 149 A // , 149 A ⊥ ) for 147 Sm 3+ and 149 Sm 3+ isotopes in the trigonal La 3+ site of La 2 Mg 3 (NO 3 ) 12 ·24H 2 O crystal from a diagonalization (of energy matrix) method. In the method, the Hamiltonian concerning the energy matrix includes the Zeeman and hyperfine interaction terms and so there is no perturbation calculation in it. The crystal-field parameters in the energy matrix are calculated using the superposition model, in which the structural data of 12-fold coordinated site rather than those of the incorrect 6-fold coordinated site given in the previous paper are applied. The calculated results are in reasonable agreement with the experimental results. The results are discussed.

Received: February 23rd, 2022 ; Accepted: May 1st, 2022 ; Published: May 11th, 2022 ; Correspondence: mluna@udemedellin.edu.co In developing countries, residual biomass usage by means of anaerobic digestion offers several benefits and opportunities, such as a sustainable energy source, production of organic fertilizers and new agrobusiness models. In Latin America, Colombia is one of the most promising markets for the implementation of this technology in terms of availability of biomass and economic growth, as recently reported by local government organizations. In this paper, special attention is given to Antioquia, a department of Colombia with the largest farms of cattle and pigs, according to information reported in 2018 by the Ministry of Agriculture and Rural Development. It is estimated that manure from the porcine subsector in Antioquia has an approximate technical-energy potential of 1,896 TJ year-1 , varying from 1,611 to 2,186 TJ year-1 , corresponding to the 95% confidence interval. In the case of manure generated by the livestock subsector in Antioquia, it is estimated a theoretical energy potential of 8,566 TJ year-1 . However, traditional extensive production systems disseminate manure through the pastures turning centralization of the available residual biomass a difficult task and not senseful. Based on the local practices of the specialized dairy subsector, it is estimated that manure collected during the milking process could reached up to 25% of the total available. Biochemical conversion of this amount of biomass has an estimated technical-energy potential of 187 TJ year-1 , varying from 156 and 236 TJ year-1 , corresponding to the 95% confidence. The aim of this article is to estimate the technical-energy potential for the livestock and porcine subsectors in the Department of Antioquia, based on the available residual biomass according to local farming practices.

An on-load tap changer (OLTC) is one of the most error-prone parts in the transformer. The stability of the entire power system will be greatly threatened if the OLTC fails. It is necessary to diagnose the mechanical fault of OLTCs. At the same time, the mechanical fault signals are not easy to collect during practical application. It is desirable to have indicators that help to access the condition of the OLTC with a small number of fault samples. This paper describes a strategy for distinguishing different mechanical diagnostics of OLTCs based on dynamic time warping. By synchronization, framing, and Fourier transform, the signal can be represented by an energy matrix, which can be used to distinguish different conditions of the OLTCs and shows the severities of the fault. Some simulated experiments are designed and in order to make the simulations close to reality, all experiments are taken in a tank which is filled with transformer oil. These experiments demonstrate that the proposed approach can effectively diagnose different OLTC faults under different fault severities.

Energy is a fundamental element for the development of societies, with energy transformation from renewable sources a challenging theme throughout the world. In Brazil, the energy matrix is composed mainly of non-renewable sources such as petroleum and its derivatives, but the transformation for electricity supply is carried out mainly by hydroelectric plants. This paper presents data from the National Energy Balance between the years 2011 to 2016, regarding the internal supply of energy, as well as the sectors that use it as their main source of electricity, allowing a better visualization of the national scenario. In view of the problem, the main objective is to present possibilities for the production of energy by ocean waves, a concept already studied in developed countries. For example, three tested converter devices are considered: one in Norway and two in Denmark. Considering this possibility from the power of the ocean waves in the world, as well as the climatic, geographical and wave characteristics of Brazil, this work indicates the possibility of a significant increase in the Brazilian energy matrix through the use of the energy of the ocean waves. However, there is a growing need to foster research and development projects in this area, so that this alternative source of energy will become viable.

The improvement energy conservation system has been challenging and interesting for small and medium enterprises (SME) of Thailand. This paper presents energy conservation in the knife industry used energy management and brainstorming workshop. Methodology applied energy matrix management and collaboration with community. The results show that this research can be reduce the energy consumption and enhancement of machinery. Moreover, the participant community induced to sustainable development.

Fossil fuels still prevail over other energy sources in the world’s consumption energy matrix. Thus, oil transportation and operations over maritime routes have been in high demand for a long time. Although oil spill accidents caused by these activities have reduced significantly over the last few decades, they still cause great concern. From this perspective, this paper presents simulation analyses of oil spill case studies using TELEMAC-3D hydrodynamic model coupled with an oil model. Hence a location susceptible to such accidents was selected and three real oil spills were simulated, for each of which there were official technical monitoring reports available. The obtained results contribute to the knowledge of oil pollution susceptibility in environmentally sensitive areas, as well as provide information concerning oil slick behaviour. Additionally, similarities between the modelled results and the technical reports were confirmed. These findings are useful for contingency planning and responding to these probable accidents.

This paper aims to address the necessity of the international community regarding the reformulation of energy policies after the oil shock (70's) to enable the diversification of its energy matrix and foster prosperous relations in this area. Thus, will approach the Brazilian energy policy through the concept of energy security that, although is often confused with energy independence, has a broader scope of analysis that overflows to a wide variety of sectors and dimensions beyond energy itself.

Concentrated Solar Energy (CSP) has been gaining ground in the world's energy matrix, given that it is a source clean, renewable and safe. Considering the potential of the Brazilian Northeast in heliothermic energy generation, this paper presents the main factors for the feasibility study of a CSP plant of central tower in three cities of the state of Rio Grande do Norte: Apodi, Caico and Mossoro. Using System Advisor Model (SAM) software as the main tool and the Gemasolar plant as a reference to for the initial design parameters, the results showed that Apodi was the most favorable for the plant's implementation of 19.9 MW, with solar multiple of 2.1, generating an optimized Levelized Cost of Electricity of 15.28 ¢/kWh and capacity factor of 61.5 %.

In the last few years there has been an increasing incorporation of solar photovoltaic generation in the Uruguayan energy matrix. This paper focuses on the subject of photovoltaic microgeneration connected in the low-voltage network. The aim of this work is to establish an adequate methodology to estimate microgeneration potential in Uruguay. Towards that end, simulations were carried out in softwares Power Factory and SimSEE in order to evaluate the impact this form of generation has on the Uruguayan Electrical System, regarding both technical and economical aspects.

This paper reports the unified calculations of the optical band positions and spin-Hamiltonian parameters (g factors g//, g⊥ and zero-field splitting D) for two trigonal Cr3+ centers in Cs2NaGaF6: Cr3+ crystals. The calculations use the complete diagonalization of energy matrix method based on the two-spin-orbit-parameter model which takes account of the contributions from both the spin-orbit parameter of central dn ion (in the conventional crystal-field theory) and that of ligands. The calculated results are rationally coincident with the experimental values. The slight local lattice distortions in both Cr3+ centers are also estimated from the calculations and the causes are discussed.

This paper aims to show the current context of Small Hydro Power Plants (SHPs) in Brazil, presenting and discussing the institutional acts, regulations for growth of the SHP, public and private policies for the sector and growth prospects. After the restructuring of the Brazilian electricity sector, a series of laws, decrees and resolutions were developed with the purpose of regulating the sector in favor of SHPs. In 2001, the number of SHPs in Brazil was 303 with an installed capacity of 855 MW. Over the years, with the changes in the sector and, in 2010, the number of buildings has reached 387, with an installed capacity of 3428 MW. Today, they are 475 SHPs in operation with the generation capacity in the country, around 4799 MW, representing 3.49% of all Brazilian energy matrix. It is estimated that in 2020 the installed capacity will be approximately 6500 MW, but there is more potential available in the country for SHPs, that has great technical and environmental characteristics. It is concluded that more attention must be given by the government policies of the electricity sector to reach in the future the full the potential of SHPs available in Brazil.

Wireless sensor networks have become ubiquitous in the present world of smart technology. With increasing popularity of WSNs in a number of applications brings the major responsibility of making these networks secure. Thus, providing energy efficient security solutions is the need of the hour. In this paper, we propose an energy efficient key pre distribution approach to establish trust among the nodes. This approach takes into account the energy of the nodes and their relative distances from each other while establishing the keys. Moreover, the existing key pre distribution techniques provide very limited or negligible protection against node compromise attack. The proposed scheme can detect node compromise attack without having the need to share a key ring.

In this last decade, the wind energy has achieved a great expansion in the Brazilian energy matrix. Hence, the study and technology development in this area has become essential for academic community and industry. The aim of this paper is to describe the design, construction and commissioning of a 10(kVA) wind energy system (WECS) prototype converter, using permanent magnet synchronous machine. The design of the main components will be described. The first experimental results are shown and briefly analyzed.

At present, the planning agencies define the percentage objectives of renewable generation with the sense of diversifying the energy matrix and achieving technical and economic sustainability. The objectives in the background may pursue different approaches when determining the optimum or mostly recommended percentage. In this sense, the work is focused on determining relevant technical and economic criteria that allow the definition of adequate percentages of large-scale wind generation. In the work, a methodology is developed that considers the construction of electrical studies scenario, including static, dynamic, voltage stability and contingency analysis, and future scenarios of economic operation. The methodology considers different degrees of wind energy input that allows in each case to assess the degree of technical vulnerability of the system and the cost of planning the long-term operation. In particular, to determine the degree of admissibility of wind power input, relevant operational factors of the operation of power systems are identified and valued. Finally, it recognizes the percentage of wind generation that locates the recommended percentage of additional income. The present article is the first of two papers that analyze the “Criteria for determining the percentage of large-scale wind energy to interconnected systems — Part I: Proposal of Methodology”. Additionally, a second article is presented, which uses the methodology applying it for a real case, Part II: Analysis of the Argentine case.

Brazil is recognized for possessing a low carbon-intensive energy matrix, with most of its power being generated from hydroelectricity. Its greenhouse gas emissions profile is dominated by deforestation and land-use change. Despite this characteristic, the country has been committed to the development of carbon capture and geological storage (CCS) research since this technology started to be recognized as a relevant solution for greenhouse gas emission reductions. This development has gained attention recently owing to the beginning of the production of pre-salt reservoirs, which may contain significant amounts of CO2 in the produced fluids. The work has been carried out mostly through the efforts of the academia and industrial enterprises. This paper presents a summary and a brief description of the recent activities being carried out by these sectors, aiming to develop and promote CCS in Brazil.

The complete diagonalisation (of energy matrix) method is applied in this paper to calculate together the optical and electron paramagnetic resonance (EPR) spectral data for Cr3+ ion at the trigonal Ga3+ site of Y3Ga5O12 crystal. The method is founded on the two-spin-orbit-parameter model where in addition to the contributions from the spin-orbit parameter of central dn ion (i.e., one-spin-orbit-parameter model) in the traditional crystal field theory, those from the spin-orbit parameter of ligand ion via covalence effect is also considered. The calculated results propose that by using only four adjustable parameters, the 12 observed spectral data (nine optical band positions and three EPR parameters g//, g⊥ and D) in Y3Ga5O12: Cr3+ are reasonably explained. The impurity-induced local lattice distortion of Cr3+ in Y3Ga5O12 crystal is also estimated through the calculations. The results are discussed.

This work tries to determine whether it is possible to stabilize CO2 emissions under a rapid increase of Gross Domestic Product in a medium term. The paper is an effort to study in detail how changes in the driving forces of the economy affect CO2 emissions. We study the case of Venezuela for the period 1980–2025, using the methodology proposed by Robalino-Lopez et al. (2014, 2013) [1] , [2] , which is based on an extension of the Kaya identity and on a GDP formation approach that includes the effect of renewable energies. We test the environmental Kuznets curve (EKC) [3] hypothesis in a coming future under different economic scenarios considering, therefore, not only past data but also projections for the coming years. We use cointegration techniques [4] and the Jaunky (2011) [5] specification to test the fulfillment of the EKC hypothesis in Venezuela. Our predictions show that Venezuela does not fulfill the EKC hypothesis, but however, the country could be on the way to achieve environmental stabilization in the medium term. This stabilization could be accomplished combining economic growth with increasing use of renewable energy, appropriated changes in the energy matrix, and in the productive sectoral structure.

The Ministry of Energy and Mines of Nicaragua (MEM) is planning to launch in 2013 a massive replacement program of 2 million incandescent lamps with compact fluorescent lamps (CFLs). This paper explores the expected impacts on a 10 year basis (2013–2023) using cost/benefit analysis for consumers, utility and society. Market conditions for introduction of a 7 W LED in the residential sector were also analyzed. Three prospective scenarios were considered in order to estimate the impact of CFLs penetration. Finally, the analysis is complemented with laboratory tests for eight lamps—three CFLs of the pilot program batch and one incandescent lamp 75 W; three CFLs and a 7 W LED available in the national market. Results supports that for countries like Nicaragua with an energy matrix still dependent on imported petroleum, energy efficiency programs are especially positive in economic and environmental terms. However, it is necessary to implement and to test CFLs programs requirements about high power factor (PF≥0.9) and low total harmonic distortion (THD≤20%).

The last 20 years have presented a favorable scenario for the incorporation of renewable energy sources into the energy matrix of developing countries. This situation promoted grid connected photovoltaic generation systems (GCPVS) to become one of the main protagonists in this new concept of energy matrix. In some developing countries the use of such systems is in its beginning. Promotion policies and technical as well as regulatory conditions for their installation have just started to be defined. In this context, there exists in Argentina a legal and regulatory framework for the implementation of large photovoltaic plants but there is a lack of such legal framework for distributed generation (DG) by means of grid connected photovoltaic into the medium and low voltage distribution networks. This situation led research centers, together with private and provincial Energy Agencies to install pilot systems in order to identify and characterize their impact on the low voltage distribution network, taking into account the local grid capacity and characteristics of each province. In this paper the implications of different degrees of penetration of solar photovoltaic power generation evaluated using technical parameters of the network is presented. A set of examples of residential users connected to a distribution substation in the city of Corrientes is analyzed by means of a simulation using real grid data with the incorporation of GCPVS generation. The simulation results show that both the level of penetration of GCPVS systems as well as location where these distributed energy sources should couple to the distribution grid must be carefully assessed to maximize the benefits of the inclusion of distributed generation in urban environments.

Currently Ecuador advocates a change in the energy matrix, academic centers should develop a strategy that allows them to short and medium term training specialists give technical responses to this proposal it must create the conditions in college so that future generations be able to link the processes of investment in energy with the territorial space. The Technical University of Manabi (UTM) has proposed a research project funded by the National Secretary of Planning and Development of Ecuador (Senplades), aimed at boosting sustainable energy solutions that are based on the technical philosophy of microgrids with the use of renewable energy sources (RES). In this paper the spatial information related to solar energy potential of the province of Manabi, Ecuador's, managed by a geographic information system (GIS ) as an integration tool that provides information on objectives that interact with microgrids shown, also the importance of its use as a management tool projects related to the use of RES and instrumentation aimed at ensuring innovative solutions to support the change of energy matrix from a territorial perspective is exposed.

This paper reports an unified calculation of optical and EPR spectral data for Cr3+ ion at the trigonal Al3+ site of KAl(MoO4)2 crystal from the complete diagonalization (of energy matrix) method based on the two-spin–orbit-parameter model. In this model, differing from that in the conventional crystal-field theory, not only the contributions from the spin–orbit parameter of central dn ion, but also those from the spin–orbit parameter of ligand ion via covalence effect are taken into account. The calculation shows that by using only three adjustable parameters, the observed twelve optical and EPR spectral data (nine optical band positions and three EPR parameters g||, g⊥ and D) are reasonably explained in a unified way with this method. The results are discussed.

The EPR g factors g|| and g⊥ for two tetragonal Ce3+ centers T1 and T2 in Ce3+-doped cubic fluorperovskites KMgF3 and BaLiF3 are calculated from the complete diagonalization (of energy matrix) method (where all the Kramers doublets within the ground and excited multiplets 2F5/2 and 2F7/2 are contained). The calculations show that the simple method of calculating g factors (where only the doublets within the ground multiplet 2F5/2 are considered) used in the previous papers cannot give the correct signs of crystal-field parameter B 2 0 and hence the reasonable defect models for these tetragonal Ce3+ centers (in fact, physically, these defect models are inconsistent). The new and consistent defect models for these Ce3+ centers are suggested as follows: in KMgF3:Ce3+, centers T1 and T2 are the substitution of Ce3+ for K+ with a nearest interstitial F− and, respectively, with and without a nearest K+ vacancy (VK) along C4 axis, and in BaLiF3:Ce3+, centers T1 and T2 are the substitution of Ce3+ for Ba2+ with, respectively, a nearest interstitial F− and a nearest Ba2+ vacancy along C4 axis because of charge compensation. Based on these defect models and by considering the orbit reduction effect due to the covalence of Ce3+–F− bonds, the g factors of these tetragonal centers are explained reasonably. The results (in particular, the approximations of the defect structural data for these tetragonal centers) are discussed.

One way to minimize the problem of energy deficit is to diversify the Brazilian energy matrix, mainly through connecting distributed generation (DG) that uses renewable energy sources — such as biogas from swine manure. This paper aims to estimate the energy potential of power generation from biogas derived from swine manure for a particular study case, also analyzing the impact of DG connection in a distribution network.

The aim of this paper is to model the crystal field parameters (CFPs) and spin-Hamiltonian parameters (g factors g | | , g ⊥ and hyperfine structure constants A | | , A ⊥ ) for the Ti3+:MgO system. The CFPs were modeled in the frame of superposition model of the crystal field theory, based on ab initio supercell calculations of Ti3+:MgO geometry and crystal field parameter 10Dq. The obtained values were used to simulate the energy levels scheme, by diagonalizing the full energy matrix of the Hamiltonian. The EPR parameters have been calculated from both the complete diagonalization method and the perturbation theory method. All the obtained results (optical and EPR) were compared with experimental data and a good agreement is observed.

By simulating the electron paramagnetic resonance (EPR) and optical spectra on the basis of the 120x120 complete energy matrix, this paper determines the local lattice structure parameters R(1) and R(2) for MCl:V(2+) (M=Na, K, Rb) systems at 77 K, 195 K and RT (room temperature 295 K or 302 K), respectively. The theoretical results indicate that there exists a compressed distortion in MCl:V(2+) systems. Meanwhile, it finds that the structure parameters R(1), R(2) and vertical bar Delta R vertical bar (= R(1) - R(2)) increase with the rising temperature. Subsequently, from the analysis it concludes that the relation of EPR parameter D vs. Delta R is approximately linear. Finally, the effects of orbital reduction factor k on the g factors for the three systems have been discussed.

Unmanned aerial vehicles (UAV) have been gaining momentum in recent years because of their vast application areas in the defence and civilian sectors. Their use can result in future missions to be more effective while also be conducted in a safer manner. UAVs, due to their large operational potential may be required to travel over long distances and prespecified way points thus requiring an effective and efficient decision making mechanism which allow the UAV to start and complete its mission. These missions may start and terminate at different or identical topological locations (or nodes). In the current paper a node-to-node graph theory energy costs modelling method is developed and presented. The modelling method requires as a priori the node-to-node energy costs. Furthermore, several propositions were presented to allow for the energy matrix to be perturbable, thus representing possible atmospheric variations which may occur during the UAVs mission. The UAV is modelled using energy graphs which allow a topological optimum to be obtained via suitable optimization algorithms. The energy costs implicitly contain time, propulsion force, and velocity information thus producing realistic results.

A produção de biocombustíveis tem sido amplamente debatida no Brasil e no ano de 2014 foi criado o Programa Nacional de Uso e Produção de Biodiesel (PNPB). Este programa busca incentivar uma maior participação de energias renováveis na matriz energética brasileira, com o objetivo de implementar de forma sustentável, técnica, e econômica, a produção e uso do Biodiesel. Além do enfoque na inclusão social e no desenvolvimento regional, via geração de emprego e renda. No panorama nacional, o Estado do Tocantins destaca-se por dispor de uma vasta disponibilidade de terras e apresentar boas perspectivas logísticas devido a implantação de novos modais de transporte. A agricultura familiar é considerada o grande propulsor do agronegócio com, aproximadamente, 45 mil propriedades rurais. Neste contexto, o presente trabalho visa demonstrar os fatores que contribuem com o cenário da produção de biodiesel no Estado do Tocantins.Palavras-chave: Produção; Sustentabilidade; Agricultura familiar; Biocombustíveis.ABSTRACTBiofuel production has been widely debated in Brazil and in 2014 was created the National Program for Production and Use of Biodiesel (NPPB). This program encouraging a greater share of renewable energies in the Brazilian energy matrix, aiming to implement sustainably , technical , and economic , production and use of biodiesel, with a focus on social inclusion and regional development by generating employment and income . On the national scene, the State of Tocantins is distinguished by having a wide availability of land and has good prospects because of logistical deployment of new modes of transportation. Family farming is considered the major driver of agribusiness with approximately 45000 farms. In this context, this paper aims to demonstrate the factors that contribute to the scenario of biodiesel production in the state of Tocantins.Keywords: Production; Sustainability; familiar Agriculture; Biofuels.

The spin-Hamiltonian parameters (g factors g∥, g⊥ and hyperfine structure constants 143A∥, 143A⊥, 145A∥ and 145A⊥) of the tetragonal Nd3+ center in the low-temperature (T≈4.2 K) tetragonal phase of SrTiO3 are calculated from a diagonalization (of energy matrix) method. In the method, the Zeeman and hyperfine interaction terms are attached to the conventional Hamiltonian and a 52×52 energy matrix concerning the ground term 4HJ (J=9/2, 11/2, 13/2, 15/2) is constructed. The Nd3+ center is attributed to Nd3+ occupying the 12-fold coordinated Sr2+ site in SrTiO3. Differing from the defect model assumed in the previous paper that the tetragonal distortion of this Nd3+ center is due to the association of one interstitial oxygen ion at a nearest neighborhood of Nd3+ and the Nd3+ displacement Δz along C4 axis, we suggest that it is due to the distortion of SrTiO3 lattice in the tetragonal phase. The calculated g factors g∥ and g⊥ show good agreement with the experimental values, suggesting that our defect model of Nd3+ center in SrTiO3 is reasonable. The experimental hyperfine structure constants were not reported and so our calculated results remain to be checked by EPR experiment.

The use of biodiesel in Brazil was consolidated after 2005, when the Federal Government established a time frame to insert biodiesel in Brazilian energy matrix and so that a 5% biodiesel in diesel blend (B5) has been mandatory since January, 2010. Now the attention turns to blends with higher level of biodiesel and vehicle and engine assemblers, fleet owners and other private and governmental entities are conducting extensive researches on the subject. This paper evaluates the use of a 20% biodiesel in diesel blend (B20) in light duty vehicles with EURO III and EURO IV technologies and its impact on the durability of engines and systems. Vehicles of both technologies endured a field test during which they accumulated 100.000 km in urban and road circuits. They were then evaluated according to the deterioration of performance and pollutants emissions and wear of parts and components. Results were compared to those obtained in similar vehicles using a B5 blend as fuel, subjected to the same test conditions. Engine wear and deposit formation on rings, pistons and cylinders were evaluated by the manufacturers through visual and dimensional inspections, and were found compatible to the use of the engines; there was no significant differences between the groups. Track performance and chassis dynamometer emissions tests showed that EURO IV vehicles were less influenced by the use of differentiated fuels, with vehicles that run on B20 during the field test showing results statistically equivalent to those that run on B5. On the other hand, EURO III vehicles that run on B20 had performance losses up to 7% when compared to those that run on B5. They could not be evaluated according to their emissions.

In this paper, the third-order perturbation formulas of EPR g factors g(i) (i=x, y, z) for d(9) ions in rhombic symmetry where the ground state being an vertical bar d(x2-y2)> admixture of and vertical bar d(z2)> states are derived. These formulas are based on a two-spin-orbit-parameter model in which the contributions to g factors due to both the spin-orbit parameter of the central 3d(n) ion and that of ligand ion are included. From these formulas, the g factors g(i) for the rhombic CuCl(6)(4-) clusters in (3-chloroanilinium)(8)[CdCl(6)]CL(4):Cu(2+) crystal are calculated. The calculated values are in good agreement with those obtained by the complete diagonalization (of energy matrix) method and experimental values. Results are discussed. (C) 2010 Elsevier B.V. All rights reserved.

This paper aimed makes a bibliographic review of how the electric energy is generated by hydropower plants and the environmental injuries by this kind of enterprise. The hydraulic energy is produced through the power of water movement, by hydropower plants. The main factors that influence the generation of this energy are: river’s flow, quantity of available water in a determined period of time and the difference in level, being them naturals, like waterfalls, or created artificially. Although of a significantly portion of contribution in world energy matrix, hydraulic energy causes several socioeconomic impacts, as great areas waterlogging injuring flora, fauna and the community that lives around the river. However this impacts are important whereas can be easily corrected, with a good environmental and social assistance, and a part of the investment coasts destined to it. Before the implantation of this enterprise, it’s important make and action plan aiming reduce

This paper examines the influence of parametric uncertainties on the optimal sensor placement methodologies for the modal analysis of a truss bridge. Four classical sensor location methodologies are employed: two based on the Fisher information matrix and the other two based on energy matrix rank optimization. Young's modulus, mass density and cross sectional dimensions are considered as uncertain parameters. The independent and cumulative effects of these uncertain variables on the sensor placement are studied. The optimal locations of sensors under parametric uncertainty are assessed with three different criteria: the Fisher matrix determinant, the modal assurance criterion error and the condition number. Furthermore, the robustness of this configuration is investigated for the case of random and bias errors. The numerical results show the parametric uncertainties have significant influence on the optimal sensor configuration of a truss bridge.

This paper examines the influence of parametric uncertainties on the optimal sensor placement methodologies for modal analysis of a truss bridge. Four classical sensor location methodologies are employed: two based on the Fisher information matrix and two based on energy matrix rank optimization. Young’s modulus, mass density and cross sectional dimensions are considered as uncertain parameters. The independent effects and cumulative effects of these uncertain variables on the sensor configuration are studied. The optimal locations of sensors under parametric uncertainty are assessed by the use of three different criteria. Furthermore, the robustness of this configuration is investigated for different levels of signal-to-noise ratio. The numerical results show the parametric uncertainties have significant influence on the optimal sensor configuration of a truss bridge.

Due to the high penetration of renewable energy into the energy matrix of today's power networks, the design of generating systems based only on static reserve assessment does not seem to be enough to guarantee the security of power system operation. From the wind power integration perspective, this energy source imposes additional requirements, mainly due to the inherent unpredictable characteristic of the wind. Besides the uncertainties in load and generating unit availabilities, the operating reserve needs also to deal with the fluctuation characteristic of the wind power. Therefore, more flexibility of the conventional generators (hydro and thermal) is required to provide system support services. This paper discusses a new methodology based on chronological Monte Carlo simulation to evaluate the operating reserve requirements of generating systems with large amounts of renewable energy sources, in particular, wind power.

Based on the different discharge processes of lightning striking, lightning overvoltage can be divided into two types: induced lightning overvoltage and direct lightning striking overvoltage (including back-flash and shielding failure). The characteristics of these overvoltages are investigated in this paper and it is concluded that induced lightning overvoltage exists simultaneously in three phases of the transmission line and similarity of its inter-phase is more significant than that of direct striking lightning overvoltage. Therefore the energy matrix similarity dependent method with the implement of wavelet transform can be applied to identify them. Mass simulation with consideration for many different fault conditions has been computed to prove its effectiveness based on ATP.

The increase in renewable sources in the energy matrix of the countries is an effort to reduce dependency on crude oil and the environmental impacts associated with its use. In order to help overcome the lack of widely accepted quality standards for fuel ethanol and to guarantee its competitiveness in the international trade market, the NMIs have been working to develop certified reference materials for bio-fuels and measurement methods. Inorganic impurities such as Cu, Na and Fe may be present in the fuel ethanol and their presence is associated with corrosion and the formation of oxide deposits in some engine parts. The key comparison CCQM-K100 was carried out under the auspices of the Inorganic Analysis Working Group (IAWG) and the coordination of the National Institute of Metrology, Quality and Technology (INMETRO). The objective of this key comparison was to compare the measurement capabilities of the participants for the determination of Cu in fuel ethanol. Ten NMIs participated in this exercise and most of them used the isotopic dilution method for determining the amount of Cu. The median was chosen as key comparison reference value (KCRV). The assigned KCRV for the Cu content was 0.3589 ?g/g with a combined standard uncertainty of 0.0014 ?g/g. In general, there is a good agreement among the participants' results. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

Availability of biomass in Brazil makes this fuel a major candidate to increase its presence in the country's energy matrix. In North-eastern Brazil, biomass available from sugarcane industry represents an annual energy resource of 146 PJ at an average cost of US$ 1.5/GJ. This paper aims to analyse the match between biomass and gas turbines. Two types of power plants are studied: the BIGGT and the EFGT cycles. The method involves design point exergoeconomic analysis, in order to identify major sources of exergy destruction and devices that can be thermodynamically enhanced. Results are compared with the Natural Gas Fuelled cycle.

Part II . The solution of the Schrodinger equation by means of the variation principle and a discrete basis leads to a certain secular equation. In a previous paper (Part I), it was shown that, if this equation is handled by a partitioning technique, a generalization of the Schrodinger-Brillouin formula is obtained. The procedure contains an inverse matrix, and it is shown here that, if in the expression for the wave function this matrix is approximated to the n th order, the corresponding matrix in the expectation value for the energy is approximated to order (2 n + 1). This gives a simple derivation and generalization of the Brillouin-Wigner theorem. The connection between the variation principle and perturbation theory is further discussed. Part III . The solution of the Schrodinger equation by means of the variation principle and a discrete but not necessarily orthonormal basis is studied in the case when the Hamiltonian H = H ( α ) is a function of a parameter α. The coefficients in the power series expansions in α of the wave function and the energy are explicitly determined in the form of expectation values, and the connection with the conventional Schrodinger theory is discussed.

Refined values of the hyperfine constants A (4p2P1/2) and A(4p2P3/2) as well as B (4p2P3/2) required a new analysis of the perturbation of the 3d10 4p2P-levels by the [3d9 (4s4p)1P]2P- and [3d9 (4s4p)2P]2P-levels in Cu I-spectrum. The improved amplitudes α, β, γ referring to these three states are . The values in brackets coming from part I of this publication are out of date now. The phases of the amplitudes β, Γ with respect to α cannot be ascertained from the magnetic hyperfine constants because of the absence of interfering matrix elements between 3d10 4p- and 3d9 4s 4p- states. But the upper choice of phases turns out to be the right one if one deduces from α, β, γ the Slater parameters of the perturbation. One finds J = R2 (3d4p, 4s4p)/5 = 1431 cm−1 and K = R1(3d4p, 4p4s)/3 = 2609 cm−1. Unfortunately the values J = 1882 cm−1, K = 1077 cm−1 quoted by BUDICK and LEVIN are wrong. They have been deduced from an energy matrix wich was not phase consistent with the basis of magnetic hyperfine constants given in a former paper of the author and used throughout part I of this publication.

The dynamic collective theory has been developed for vibrational nuclei in a previous paper. Here the details are studied and compared with experiments. For this purpose the structure of the dipole operator has been established, the energy matrix of the dipole-quadrupole interaction has been diagonalized and the various approximations are discussed quantitatively in detail. It is interesting that this systematic theory gives the details of theγ-absorption cross section in many nuclei.

Why should we pursue an understanding of aromaticity and antiaromaticity on the basis of HVB theory? The first and most important reason is that HVB theory is equivalent to the theory which is the foundation of most present day concepts of chemistry: HMO theory with neglect of overlap. Secondly, an HVB treatment of steroselection has never been presented before. Accordingly, this section fills a void in the theoretical literature. Thirdly, the HVB theory of model systems constitutes preparation for the VB theory of real systems to be presented in following papers. Finally, HVB theory is the simplest illustrator of the conceptual advantages of the VB method, in a general sense. It is the first obligatory step along the pedagogical route leading to ultimate mastery of rigorous VB theory.

This paper explores the relation between business sustainability, both linked to financial profit as well as to relations with local organizations, and the environment, in a context of an internationalized economy such as the Chilean economy. Likewise, it analyzes recent conflicts originated in Chile for energy supply and the difficulties in defining an energy matrix. Finally, the article analyzes the influence of ecological ethics in the preservation of the high diversity ecosystems in the South of Chile, facing the business development and the specific energy projects. Sustentabilidade empresarial, seguranca energetica e etica ambiental no Chile Resumo: O artigo explora a relacao entre sustentabilidade empresarial —associada tanto a rentabilidade financeira como as relacoes com coletivos locais— e o meio ambiente, no contexto de uma economia internacionalizada como a chilena. Do mesmo modo, analisa conflitos recentes originados no Chile para o provimento de energia e as dificuldades na definicao de uma matriz energetica, e, finalmente, a influencia da etica ecologica para a preservacao dos ecossistemas de alta biodiversidade no sul do Chile, frente ao desenvolvimento empresarial e aos projetos energeticos, especificamente.