Iskanje po katalogu digitalne knjižnice

Opis: The interaction of microorganisms and their enzyme activity is one of the key indicators for a comprehensive measurement of soil health. The aim of this study was to determine significant correlations between different soil microorganisms and enzyme activities of β-glucosidase, N-acetyl-glucosaminidase, urease, arylamidase, phosphatase, acid phosphatase, alkaline phosphatase, and arylsulfatase after supplementation with standard fertilizer, spent mushroom substrate and composed fertilizer in soils from conventional–integrated, organic and biodynamic farming. Samples were grouped according to the farming system and fertilization for all seasons. The biodynamic farm was the least affected by the different fertilizations, except for standard fertilization. Standard fertilizer caused negative correlations between the actinomycetes and the arylsulfatase in organic and biodynamic farms. The same fertilization affected the actinomycetes/phosphatase relationship differently, regardless of the basic soil structure. Actinomycetes correlated positively with acid phosphatase and urease in conventional–integrated and biodynamic farms after spent mushroom substrate, respectively. Arylamidase activity in relation to total microorganisms responded to fertilization with standard fertilizer and spent mushroom substrate independently of the basic soil structure. Fertilization can influence the soil microbe/enzyme relationships in different soils. Regardless of the basic soil structure, some of these relationships could be important indicators for further studies.
Ključne besede: agriculture, conventional-integrated, organic, biodynamic, fertilization, soil microorganisms, soil enzyme activity
Objavljeno v DKUM: 17.04.2025; Ogledov: 0; Prenosov: 3
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Opis: By integrating renewable energy sources into the existing distribution network, the characteristics and local stability of the network is highly impacted. The network, which was built with the goal of a directed energy flow from large conventional sources connected to the transmission network via the distribution network to consumers, can change the direction of the energy flow. The adoption of environmental commitments and directives encourages the integration of local dispersed energy sources, which can worsen voltage conditions in the distribution network. To avoid excessive local production, distribution network operators must limit the installation of new generati on units, as it is necessary to take into account the quality of power supply by monitoring its network parameters, such as the appropriate voltage profi le and the rati o between acti ve and reacti ve power. On the other hand, excessive loads due to the mass transiti on of household heati ng and transport towards electricity can also pose a problem for high-quality electricity supply due to the excessive voltage drop. The arti cle presents an algorithm for determining the maximum size of unit producti on and the maximum load at a node in the distributi on network. Also demonstrated is the use of variable tap transformer technology, which adjusts the tap of the transformer to provide an appropriate voltage profi le in the network. The enti re analysis was performed on a model of a real medium-voltage network, in which solar and hydropower plants are already included. The model was verifi ed by comparing its calculated values with actual measurements. The goal was to determine the size of the unit’s maximum producti on, as well as the size of the maximum load, by using the diff erenti al evoluti on algorithm, while keeping voltage profi les within the permissible limits. The results of the analysis are presented in the article.
Ključne besede: distribution network, renewable energy sources, optimisation method, voltage profile
Objavljeno v DKUM: 30.10.2023; Ogledov: 425; Prenosov: 56
Celotno besedilo (1,63 MB)
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Opis: V magistrskem delu je predstavljena primerjava primernosti lokacij za fisijsko in fuzijsko jedrsko elektrarno. Najprej je predstavljen osnovni koncept in delovanje obeh vrst jedrskih elektrarn. V nadaljevanju sledi pregled nekaterih znanih dogodkov, z vzrokom nastanka zunaj območja elektrarne, iz obstoječih fisijskih elektrarn, ki so potencialno ogrozili varnost elektrarne. Nato je predstavljen postopek izbire lokacije za jedrsko elektrarno. Na izbiro lokacije vplivajo zahteve jedrske elektrarne. V nadaljevanju je pojasnjeno, zakaj se razlikujejo zahteve za fuzijsko in fisijsko jedrsko elektrarno. Vendar pa se z izbiro lokacije ne moremo izogniti vsem zunanjim dejavnikom, ki lahko vplivajo na varnost jedrske elektrarne, zato so predstavljeni načini branjenja pred zunanjimi dejavniki. Magistrsko delo povzema trenutno stanje in znanost na področju fuzijskih elektrarn.
Ključne besede: jedrska fisija, jedrska fuzija, primerna lokacija, zakonodaja
Objavljeno v DKUM: 03.07.2020; Ogledov: 1287; Prenosov: 142
Celotno besedilo (1,44 MB)