scholarly journals Some aspects of modern vision for geoenergy usage

2019 ◽  
Vol 123 ◽  
pp. 01010
Author(s):  
Roman Dychkovskyi ◽  
Mykola Tabachenko ◽  
Kseniia Zhadiaieva ◽  
Edgar Cabana
Keyword(s):  
Renewable Resources ◽  
Energy Production ◽  
Modern Society ◽  
Raw Material ◽  
Chemical System ◽  
Current State ◽  
Mining Enterprise ◽  
Modern Vision ◽  
Ecological Complex ◽  
Radical Technologies

The paper represents analysis, which have helped to determine tendencies of usage secondary and renewable resources by means of their utilization within the closed ecological complex while implementing integrated cogeneration systems belonging to various sources. Both the current state and prospects of secondary and renewable resources use within the closed complex of a mining enterprise have been considered. Relying upon philosophical approaches as for the formation of a viewpoint concerning responsibility of the modern society to future generations, tendencies to form energy production and energy consumption on the basis of alternative radical technologies have been proposed. The authors have put forward tendencies to change coal mining and coal use while generating the raw material from the abandoned and out-of-balance reserves. Chances to use cogeneration systems by various energy sources have been considered. Formation of the unified power and chemical system to improve economic and ecologic expediency of the proposed measures is the key tendency of energy perfection as well as minimization of impact on the underground mine environment and on the surface to prolong activities of dying mining territories and to reduce social tension.

Resource efficiency in deinked pulp production: a review

TAPPI Journal ◽  
2014 ◽  
Vol 13 (11) ◽  
pp. 37-43 ◽  
Author(s):  
LIISA KOTANEN ◽  
MIKA KÖRKKÖ ◽  
ARI ÄMMÄLÄ ◽  
JOUKO NIINIMÄKI
Keyword(s):  
Waste Disposal ◽  
Resource Efficiency ◽  
Raw Material ◽  
Ecological Strategy ◽  
Recycled Paper ◽  
Paper Production ◽  
Recycled Pulp ◽  
Current State ◽  
The Cost ◽  
Pulp Production

The use of recovered paper as a raw material for paper production is by far the most economical and ecological strategy for the disposal of waste paper. However, paper production from recovered paper furnish generates a great amount of residues, and the higher the demand requirements for the end product, the higher the amount of rejected material. The reason for this is that the selectivity of the deinking process is limited; therefore, some valuable components are also lost in reject streams. The rejection of usable components affects the economics of recycled paper production. As the cost of waste disposal continues to increase, this issue is becoming more and more severe. This paper summarizes the current state of the resource efficiency in recycled pulp production and provides information on the volumes of rejected streams and the usable material within them. Various means to use these reject streams are also discussed, including the main findings of a recent thesis by the main author. This review summarizes current internal and external use of reject streams generated in the deinking operations.

scholarly journals Tagasaste, leucaena and paulownia: three industrial crops for energy and hemicelluloses production

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Alberto Palma ◽  
Javier Mauricio Loaiza ◽  
Manuel J. Díaz ◽  
Juan Carlos García ◽  
Inmaculada Giráldez ◽  
...  
Keyword(s):  
Activation Energy ◽  
Acid Hydrolysis ◽  
Energy Production ◽  
Combustion Process ◽  
Operating Conditions ◽  
Raw Material ◽  
Energy Of Combustion ◽  
Increasing Temperature ◽  
Hydrolysis Of ◽  
Chamaecytisus Proliferus

Abstract Background Burning fast-growing trees for energy production can be an effective alternative to coal combustion. Thus, lignocellulosic material, which can be used to obtain chemicals with a high added value, is highly abundant, easily renewed and usually inexpensive. In this work, hemicellulose extraction by acid hydrolysis of plant biomass from three different crops (Chamaecytisus proliferus, Leucaena diversifolia and Paulownia trihybrid) was modelled and the resulting solid residues were used for energy production. Results The influence of the nature of the lignocellulosic raw material and the operating conditions used to extract the hemicellulose fraction on the heat capacity and activation energy of the subsequent combustion process was examined. The heat power and the activation energy of the combustion process were found to depend markedly on the hemicellulose content of the raw material. Thus, a low content in hemicelluloses resulted in a lower increased energy yield after acid hydrolysis stage. The process was also influenced by the operating conditions of the acid hydrolysis treatment, which increased the gross calorific value (GCV) of the solid residue by 0.6–9.7% relative to the starting material. In addition, the activation energy of combustion of the acid hydrolysis residues from Chamaecytisus proliferus (Tagasaste) and Paulownia trihybrid (Paulownia) was considerably lower than that for the starting materials, the difference increasing with increasing degree of conversion as well as with increasing temperature and acid concentration in the acid hydrolysis. The activation energy of combustion of the solid residues from acid hydrolysis of tagasaste and paulownia decreased markedly with increasing degree of conversion, and also with increasing temperature and acid concentration in the acid hydrolysis treatment. No similar trend was observed in Leucaena diversifolia (Leucaena) owing to its low content in hemicelluloses. Conclusions Acid hydrolysis of tagasaste, leucaena and paulownia provided a valorizable liquor containing a large amount of hemicelluloses and a solid residue with an increased heat power amenable to efficient valorization by combustion. There are many potential applications of the hemicelluloses-rich and lignin-rich fraction, for example as multi-components of bio-based feedstocks for 3D printing, for energy and other value-added chemicals.

DIRECTIONS FOR ENHANCING THE DEVELOPMENT OF CITRUS FRUIT GROWING IN AZERBAIJAN

2021 ◽  
Vol 1 (10) ◽  
pp. 167-173
Author(s):  
Nurida Аlish Gasimova ◽  
Keyword(s):  
Citrus Fruit ◽  
Economic Importance ◽  
Point Of View ◽  
Raw Material ◽  
Current State ◽  
Citrus Production ◽  
Fruit Growing

The increase in citrus production is of particular economic importance both from the point of view of meeting the demand of the population for these products, and from the point of view of its use as an industrial raw material. The article studies and analyzes the current state of citrus cultivation in Azerbaijan, the possibilities of increasing their production; relevant suggestions and recommendations are made.

Studying the Effect of some Factors on the Stress-Strain Behavior of the Rostov Region Limestones in the Course of their Production and Use

2021 ◽  
Vol 1022 ◽  
pp. 80-86
Author(s):  
Mikhail G. Kholodnyak ◽  
Sergey A. Stelmakh ◽  
Evgeniy M. Shcherban ◽  
Mukhuma P. Nazhuev
Keyword(s):  
Construction Material ◽  
Experimental Studies ◽  
Raw Material ◽  
Material Base ◽  
Strain Behavior ◽  
Current State ◽  
Rostov Region ◽  
Literary Sources ◽  
Crushed Granite ◽  
Strain Stress

The paper considers the current state of the mineral raw material base and the construction material market of the Rostov Region. The effect of various factors on the strain-stress behavior of local limestones has been investigated. The scientific and technical literary sources devoted to the processes of rock failure under various loads have been analyzed. The experimental studies have shown that the tested samples of limestone with a high content of cuboidal grains have characteristics comparable to those of the crushed granite stone. It has been concluded that the use of the Rostov Region limestones in the construction industry is competitive and feasible, provided the proper implementation of the engineering measures proposed in their production.

scholarly journals Bioenergía a partir de microalgas en México

2019 ◽  
pp. 23-34
Author(s):  
Sheila Genoveva Pérez-Bravo ◽  
Ana María Mendoza-Martínez ◽  
Maria del Refugio Castañeda-Chávez ◽  
Luciano Aguilera-Vázquez
Keyword(s):  
Energy Demand ◽  
Energy Production ◽  
Fossil Fuel ◽  
Technological Development ◽  
Raw Material ◽  
World Population ◽  
Fuel Prices ◽  
Lipid Contents ◽  
Current Energy ◽  
Short Carbon

The energy demand of the world population is increasing due to population growth and technological development. The current energy base is a generator of CO2 emissions, the most abundant and main greenhouse gas responsible for global warming, as well as pollutants, sulfur oxides and nitrogen oxides. The environmental deterioration and the increase in fossil fuel prices make it necessary to investigate less aggressive energy sources with the environment at competitive costs in the market. Biofuels are an alternative for energy production due to their origin in the short carbon cycle, their emissions are considered almost zero, including biodiesel and bioethanol. The latter can be obtained from microalgae rich in carbohydrates and lipids, easy to grow in short periods of time. The objective of this research is to summarize the findings made about the existence of useful microalgae as raw material to produce biofuels in Mexican territory. An exhaustive review of the literature was carried out, which contributed to estimate the microalgal diversity in the country and its lipid contents as well as carbohydrates, with different species of the genera Chlamydomonas, Chlorella, Scenedesmus, Desmodesmus being found mainly.

scholarly journals Financial literacy of university students – the Czech and Slovak experience

2017 ◽  
Vol 4 (7) ◽  
pp. 41-51
Author(s):  
Ales Kozubik ◽  
Zuzana Kozubikova ◽  
Jiri Rybicka
Keyword(s):  
Statistical Analysis ◽  
University Students ◽  
Financial Literacy ◽  
Questionnaire Survey ◽  
Statistical Tests ◽  
Personal Characteristics ◽  
Modern Society ◽  
The Self ◽  
European Countries ◽  
Current State

Financial literacy is one of the key components of education for living in a modern society. In this article, we present the results of our research into the current state of financial literacy among university students from two European countries. Our research was conducted in the form of a questionnaire survey. In the first part of the questionnaire we investigated selected personal characteristics of respondents and the second part was devoted to knowledge in different areas of financial literacy. The knowledge questions were focused mainly on respondents’ competence in specific practical situations. The obtained data were processed by statistical analysis, including the dependencies between the results of the knowledge part and the self-reflexive assessment in the first part of the questionnaire. This analysis revealed several noteworthy findings. Keywords: Financial literacy; questionnaire survey; statistical tests;

scholarly journals ABOUT METHODS OF SEISMIC ANALYSIS OF UNDERGROUND STRUCTURES

2018 ◽  
Vol 14 (3) ◽  
pp. 14-25
Author(s):  
Alexander M. Belostotsky ◽  
Pavel A. Akimov ◽  
Dmitry D. Dmitriev
Keyword(s):  
Seismic Analysis ◽  
General Structure ◽  
Underground Structure ◽  
Modern Society ◽  
Coupled System ◽  
Earthquake Activity ◽  
Underground Structures ◽  
Current State ◽  
Displacement Based ◽  
Methods Numerical

As is known, underground facilities are an integral part of the infrastructure of modern society. These objects have some specific characteristics such as complex construction, high cost, long life cycle, etc. Once it is destroyed, the direct and indirect losses are more seriousness than the general structure in the ground. Under-ground facilities built in areas subject to earthquake activity must withstand both seismic and static loading. Therefore, it is very important to carry on the seismic design of the underground structure in a safe and economi-cal way. The distinctive paper presents a summary of the current state of seismic analysis for underground struc-tures. Classification and brief overview of methods of seismic analysis of underground structures (force-based methods, displacement-based methods, numerical methods of seismic analysis of coupled system “soil – under-ground structure”) are presented, problems of soil-structure interaction are under consideration as well. So-called static finite element method with substructure technique for seismic analysis of underground structures is de-scribed.

scholarly journals The use of renewable resources is an opportunity and an obligation

2014 ◽  
pp. 13-17
Author(s):  
Zoltán Balla
Keyword(s):  
Solar Wind ◽  
Renewable Energy ◽  
Renewable Resources ◽  
Energy Production ◽  
Fossil Fuels ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Rational Utilization ◽  
Security Of Supply ◽  
Harmful Substances

The renewable energy sources could be used in energy production, while no or only very slightly emit harmful substances to the environment. The solar, wind, hydropower, biomass and heat rational utilization of land contributes to greenhouse gas emissions.Renewable energy sources also reduces the dependence on fossil fuels, thus contributing to increase security of supply. The creation of local jobs to strengthen the area's population retaining ability.

Spiritual Exercise as Techne: Philosophy as a Way of Liberating Education

2021 ◽  
Vol 25 (4) ◽  
pp. 640-655
Author(s):  
Shu-Fen Lin ◽  
Wei-Ding Tsai ◽  
Denis Igorevich Chistyakov
Keyword(s):  
Education System ◽  
Modern Society ◽  
Modern Technology ◽  
Spiritual Exercises ◽  
Social Phenomena ◽  
Modern Education ◽  
Current State ◽  
Life Context ◽  
Meaningful Existence

The study of education systems as social phenomena has led scholars to question the role of education in modern society. The question of how to improve education naturally leads to concerns about what is wrong with the present education system. If education is meant to elevate the next generation, how can it meet the goal of ensuring a meaningful existence for those being educated? Scholars have demonstrated that education has been reduced to a process of the construction of objects, where curriculum as techne commodifies students into products with market value. We propose that the tendency of interpreting techne as technology is a perspective of the modern age, and the rules of modern education are based on the rules of modern technology, under the guidance of the paradigm of productivity. We will introduce a broader interpretation of techne which frames it as the cultivation of virtue, i.e., virtue-techne. On this basis, education could be viewed as techne in the sense of praxis (practice, exercise), rather than as fabrication in the sense of production. We highlight the rising rate of student suicides in Taiwan in recent years, where we determine the education system lacks a focus on praxis. This article investigates alternative praxis-oriented notions of education, from Aristotle's cultivation of virtue to Hadot's "spiritual exercises," to advocate for a shift away from the production paradigm. Indebted to Heidegger, we clarify his "techne as revealing" by emphasizing two frameworks for education: The first, modern education being valued by its adherence to metrics based in the paradigm of production. The second, education as a process wherein its value is derived from the life context of the participating individual. Finally, as a comparative study, we explore the current state of education in Russia and Taiwan, and present the case of one high school in Taiwan which has adopted the practice of spiritual exercises in its curriculum, including a required hike to the peak of Taiwan's tallest mountain, to cultivate a sense of (and value for) the liberated life before its students graduate.

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