Search results for "Biomas"
showing 10 items of 980 documents
Impact of silicates and detergents on primary production and total biomass of algae in a short-term laboratory experiment
2006
Zinc Adsorption by Activated Carbon Prepared from Lignocellulosic Waste Biomass
2019
Sawdust was used as a precursor for the production of biomass-based activated carbon. Carbonization and activation are single-stage processes, and steam was used as a physical activation agent at 800 °
La risorsa rinnovabile per la sostenibilità ambientale ed energetica dei sistemi serra in Italia
2014
Sustainable Fertilization in Medicinal and Aromatic Plants
2015
The nutrient level in the soil is one of the most investigated aspects of agricultural research, also including research into Medicinal and Aromatic plants. The effect of fertilization has been studied in detail for many species, with contrasting results as concerns above all the qualitative aspects of production. Generally speaking, an increased level of nutrients induces an enhancement of plant biomass, but when the goal of cultivation is different from herbage yield, i.e. when a special plant part (seeds, or roots, or flowers) is of interest, or when the quality features are especially important, the outcome of fertilization may be dramatically different. A fine-tuned fertilization pract…
Control of the Development of Swirling Airflow Dynamics and Its Impact on Biomass Combustion Characteristics
2017
Abstract The development of the swirling flame flow field and gasification/ combustion dynamics at thermo-chemical conversion of biomass pellets has experimentally been studied using a pilot device, which combines a biomass gasifier and combustor by varying the inlet conditions of the fuel-air mixture into the combustor. Experimental modelling of the formation of the cold nonreacting swirling airflow field above the inlet nozzle of the combustor and the upstream flow formation below the inlet nozzle has been carried out to assess the influence of the inlet nozzle diameter, as well primary and secondary air supply rates on the upstream flow formation and air swirl intensity, which is highly …
Koģenerācijas staciju koksnes pelnu un bioogles īpašības un to izmantošanas iespējas lauksaimniecībā
2017
Biomasas koģenerācijas sistēmas ir labs risinājums videi draudzīgākas enerģijas (siltuma un elektrības) ražošanā, tomēr biomasas sadedzināšanas rezultātā rodas ievērojams daudzums pelnu un bioogle, kas pārsvarā tiek apglabāti poligonos kā atkritumi. Maģistra darba mērķis – analizēt biomasas koģenerācijas staciju koksnes vieglo pelnu un bioogles sastāvu, īpašības, tajā skaitā toksicitāti, ietekmi uz augu attīstību, kā arī izvērtēt izmantošanas iespējas lauksaimniecībā. Rezultāti liecina, ka vieglie pelni un bioogle, nepārsniedzot noteiktu koncentrācijas līmeni, veicina sēklu dīgtspēju, augu augšanu, biomasas pieaugumu un nodrošina labu sakņu attīstību. Tādējādi pelnus un bioogli ir iespējams…
Biomass estimator for NIR image with a few additional spectral band images taken from light UAS
2012
A novel way to produce biomass estimation will offer possibilities for precision farming. Fertilizer prediction maps can be made based on accurate biomass estimation generated by a novel biomass estimator. By using this knowledge, a variable rate amount of fertilizers can be applied during the growing season. The innovation consists of light UAS, a high spatial resolution camera, and VTT's novel spectral camera. A few properly selected spectral wavelengths with NIR images and point clouds extracted by automatic image matching have been used in the estimation. The spectral wavelengths were chosen from green, red, and NIR channels.
Hyperspectral imaging based biomass and nitrogen content estimations from light-weight UAV
2013
Hyperspectral imaging based precise fertilization is challenge in the northern Europe, because of the cloud conditions. In this paper we will introduce schemes for the biomass and nitrogen content estimations from hyperspectral images. In this research we used the Fabry-Perot interferometer based hypespectral imager that enables hyperspectral imaging from lightweight UAVs. During the summers 2011 and 2012 imaging and flight campaigns were carried out on the Finnish test field. Estimation mehtod uses features from linear and non-linear unmixing and vegetation indices. The results showed that the concept of small hyperspectral imager, UAV and data analysis is ready to operational use.
Task-Specific Organic Salts and Ionic Liquids Binary Mixtures: A Combination to Obtain 5-Hydroxymethylfurfural From Carbohydrates
2019
The increase in energy demand and depletion of fossil fuels are among major issues of modern society. Valorization and transformation of raw materials in products of industrial value represents a challenge. This justifies the growing interest of scientific research towards the identification of suitable media and methodologies able to pursue above goals, paying attention to matter of sustainability. On this subject, we studied sulfonic-acid functionalized diimidazolium salts as catalysts for the conversion of fructose and sucrose to 5-hydroxymethylfurfural (5-HMF) in an ionic liquid mixture. In general, using these salts allowed us to obtain 5-HMF in good yields from both substrates in mild…
Torrefioimalla käsitellyn puun varastoinnissa liukenevat yhdisteet
2016
Torrefiointi on uusi tapa käsitellä biomassaa. Torrefioitua biomassaa voidaan käyttää korvaaman fossiilisia polttoaineita korkealaatuista polttoainetta vaativissa voimalaitoksissa, joissa perinteisten biopolttoaineiden laatu ei riitä. Torrefiointi lisää biomassan energiatiheyttä ja tehollista lämpöarvoa merkittävästi. Kasvanut energiatiheys alentaa myös kuljetuskustannuksia verrattuna muihin biopolttoaineisiin. Tämän vuoksi torrefoidusta biomassasta, erityisesti torrefioiduista puupelleteistä on kaavailtu kivihiilen korvaavaa polttoainetta pölypolttolaitoksissa. Torrefioitujen puupellettien varastoitavuuden ja kosteuden keston oletetaan olevan tavallisia puupellettejä parempi, jolloin niitä…