خيارات البحث
النتائج 51 - 60 من 99
Testing the 'Rotstop' biological preparation for controlling Heterobasidion root rot in Latvia
2014
Brauners, I., Latvia Univ. of Agriculture, Jelgava (Latvia);Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Bruna, L., Forest Sector Competence Centre, SIA, Riga (Latvia) - MNKC | Gaitnieks, T., Latvian State Forest Research Inst. Silava, Salaspils (Latvia)
In Latvia, Picea abies and Pinus sylvestris as the commercially most valuable species make more than half of all woodlands. It has been found that about 23% of spruce stands are infected by root rot, caused predominantly by fungal pathogen Heterobasidion annosum s.l. To restrict the spread of root rot in coniferous forests of Latvia, the Joint Stock Company ''Latvijas valsts meži'' collaborated with Latvian State Forest Research Institute ''Silava'' in 2006 and launched a project for testing the Rotstop biological preparation, containing a suspension of Phlebiopsis gigantea spores. This project had a general task to accomplish Rotstop using technology approbation in Latvia and develop control system. Starting with the year 2008, preparation was used for stump treatment during thinning operations. When analysing the field data, a conclusion made in other studies was confirmed - P. gigantea colonizes pinewood more intensively even in case of improper stump treatment. It implies that the quality of stump treatment is decisive when using Rotstop for rot control in spruce stands.
اظهر المزيد [+] اقل [-]Evaluation of thermal properties of wood based composite panel walls
2014
Rozins, R., Latvia Univ. of Agriculture, Jelgava (Latvia) | Iejavs, J., Forest and Wood Products Research and Development Inst., Jelgava (Latvia)
Invention of light weight cellular wood material (CWM) with a trade mark of Dendrolight is one of the most important innovations in wood industry of the last decade. Currently CWM has been used as core material for sandwichpanels. These three layer panels are used in furniture industry and have wide non-structural applications. The aim of the research was to define the thermal properties of CWM and evaluate various wall envelopes where solid wood cellular material is used. There were 4 specimens of cellular wood material manufactured with nominal dimensions thickness 120 mm, length and with 600 mm to determine thermal conductivity and thermal transmittance according to standard EN 12667:2002. The specimens were manufactured of four layer 112 mm thick Scots pine (Pinus sylvestris L.) CWM double faced with 4 mm thick high-density fiberboard (HDF). Adhesive used in the bonding process was polivinilacetate Cascol 3353. Each direction (parallel, perpendicular) was represented by two specimens. Common procedure to evaluate the energy efficiency of building envelope is to calculate thermal transmittance in static conditions. The influence of the cellular material orientation to its thermal properties was investigated. Coefficient of thermal conductivity was determined for both material directions of CWM (l0 =0.0977 W∙m-1∙K-1 l90=0.148 W∙m-1∙K-1), combining the test method of EN 12667:2002 and calculation method of standard EN 6946:2008. To calculate thermal transmittance of various wall envelopes calculation software in JavaScript environment was created. Various compositions of external walls were assessed, thermal transmittance of these structures were calculated according to standard EN 6946:2008.
اظهر المزيد [+] اقل [-]Relationship between mechanical and electric cutting power at longitudinal sawing
2014
Abele, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Tuherm, H., Latvia Univ. of Agriculture, Jelgava (Latvia)
When the measurements of power consumed by cutting mechanism electromotor are made, the mechanical cutting power cannot be obtained, because they are different physical processes. However, determination of electricity power is relatively simpler. Therefore, both powers are determined in the study, in order to evaluate coherence between them. Computer numerical control machine was used for climb-sawing of aspen (Populus tremula L.) wood with a circular saw. Mechanical cutting power was calculated from measurements of cutting force, but the electric ones – from measurements of current and voltage. As a result, changes of both powers and of specific cutting work, on what the analytical calculation of cutting power is based, were obtained depending on length of the cutting trajectory. It is found out, that mechanical cutting power is greater than electric power, and it is useful to use for the analytical calculation, based on determination of the specific cutting work, wear coefficient of the cutter that depends not only on the duration of work of cutter, but also on feed speed and the length of the cutting trajectory.
اظهر المزيد [+] اقل [-]Froude number for estimation of biodiversity in small Lithuanian rivers
2014
Geguzis, R., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania) | Baublys, R., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania) | Vaikasas, S., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania)
The majority of natural Lithuanian rivers were regulated during intensive land reclamation period. Straightening of rivers caused unfavourable conditions for biodiversity. Four tributaries of the Merkys River in the South Lithuania were selected to explore changes in biodiversity patterns and determine the relationships between flow energy distribution in beds and ecological status of selected rivers. The research has shown that variation of cross sections area was usually 1.2 to 2.3 times higher in natural beds as compared to regulated ones. The range of rivers flow energy, estimated by Froude number, values were characterized as higher in natural (0.0 to 0.35) streams than in regulated (0.0 to 0.20) ones. This is the reason why the biggest number of macroinvertebrate taxa during the research period was recorded in natural riverbeds and the lowest - in the fields of the regulated segments. The assessing the abundance of fish revealed that total fish density in natural river sections was four times higher than in regulated ones. The research has approved the importance of naturalness for biodiversity and rehabilitation of regulated rivers in Lithuania.
اظهر المزيد [+] اقل [-]The role of agriculture in ensuring the energy security in Poland
2014
Marks-Bielska, R., University of Warmia and Mazury in Olsztyn (Poland) | Kurowska, K., University of Warmia and Mazury in Olsztyn (Poland) | Kryszk, H., University of Warmia and Mazury in Olsztyn (Poland)
The purpose of this article has been to present a range of products which can be obtained from agricultural production and used for energy purposes. The domestic demand for plant material to be converted to biocomponents was assessed, including the demand for oilseed rape seeds and other grain used to make bioethanol in Poland. One of the ways to limit the adverse effect of fossil fuels on the environment is by using renewable resources. Agriculture is the producer of biomass used to make biocomponents for liquid fuels and raw materials for substitution of solid fuels. The EU, wishing to stimulate production of biomass for energy purposes, has brought to life several legal acts which force the use of biofuels in the European Community. Farmers who produce substrate for bio-fuel production were offered subsidies to energy crop plantations, at first paid from the state budget, and in 2007 – 2009 provided under the Common Agricultural Policy (CAP), which increased the farmers’ revenues from farming. The decisions approved of while reviewing the CAP are to improve – via the market mechanism – the production and export potential of the whole EU. This is to be achieved, for example, by abolishing the subsidies to energy crops, which ceased to be paid in 2010. Such subsidies improved (artificially) the profitability of energy crop plantations, while causing a relative decrease in food production in Europe. By participating in the CAP, Poland is obliged to undertake certain measures in the domestic policy that will comply with the decisions made on the EU level.
اظهر المزيد [+] اقل [-]Farm diversification in Hungary
2014
Hamza, E., Research Inst. of Agricultural Economics, Budapest (Hungary)
The value of farm diversification is unquestionable especially in terms of additional income generation, income stability and easing the employment difficulties of agricultural producers; its importance has recently been in the focus of agricultural and rural policies. The research purpose was to describe the situation of farm diversification in Hungary and to analyse the characteristics of diversified farms, as well as to determine which factors influence the extent and direction of diversification. The research method is based on statistical data analysing and questionnaire survey. Contrary to the above my analyses showed that the share of diversified farms is rather low in the small-scale, semi-commercial and part-time farms; its wide scale distribution is hindered by several factors. Based on the analyses I found that in private farms and in corporate farms it is characteristic that farm diversification activities are closely connected to the main activity of the farm, but they are of different type. I could state that the share of diversified farms is more significant in the labour-intensive farms and primarily in commercial farms. The share of young farmers and farmers in active age, qualified and with a full-time job is higher in the diversified and organic farms.
اظهر المزيد [+] اقل [-]The consumer's choice of branded products conformity to national identity: case of Baltic States
2014
Bikernieks, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Eglite, A., Latvia Univ. of Agriculture, Jelgava (Latvia)
The aim of the paper is to show the general trend of consumption in the Baltic countries. The member states of the European Union attach great importance to the well-being, health and the promotion of healthy lifestyle. In order to be able to make decisions on the future plan of action, COBEREN (Consumer Behaviour Erasmus Network) carried out a project with an aim of studying the food consumption habits in the European Union countries. The obtained results show the consumer habits of each participating state, although not on the regional level. This study will look at the consumption habits in the Baltic countries and find out the nature of consumption in those three states. The statistical method – analysis of variance – was used to analyse the COBEREN data. The main conclusion is that consumers of the Baltic countries do not differ greatly in their consumption habits.
اظهر المزيد [+] اقل [-]Influence of product attributes on milk consumer's choice in Lithuania
2014
Pileliene, L., Vytautas Magnus Univ., Kaunas (Lithuania) | Liesionis, V., Vytautas Magnus Univ., Kaunas (Lithuania)
Consumer decision making is one of the most relevant topics in marketing. Therefore, organizations endeavour to create products in a way that correspond to their customers’ needs and preferences. The emerging worldwide interest in healthy lifestyle and organic products could become the key success factor for food producing organizations. The article aims to determine the product attributes affecting consumer’s choice of a milk product in Lithuania. The method of Conjoint analysis was chosen for the research. The research was provided as a repetition of the same research, done in 2009. According to the principles of the Conjoint analysis, six attributes of milk were named: ‘Country of origin’, ‘Naturalness’, ‘Package size’, ‘Package type’, ‘Richness’, and ‘Price’. Each of the attributes was divided into several levels. While analyzing the structure of milk market in 2014, four market segments were distinguished: ‘Irrationally price concerned’, ‘Rationally price concerned’, ‘Ethnocentric ecologists’, and ‘Richness concerned’. Such segments like ‘Ethnocentric’, ‘Price-and-Richness concerned’ or ‘Ethnocentric price-concerned’ have disappeared from the market during the five-year period. According to research results, following suggestions were made for the companies dealing with the milk market in Lithuania: first of all, a company has to make a decision about the segment to work with; afterwards, based on the results of conjoint analysis (conditional utilities of attributes levels), optimal propositions for every particular segment have to be composed.
اظهر المزيد [+] اقل [-]The phenomenon of non-governmental organizations: new stimuli for cultural development in rural areas of Poland
2014
Sroda-Murawska, S., Nicolaus Copernicus Univ., Torun (Poland) | Szczepańska, A., University of Warmia and Mazury in Olsztyn (Poland) | Bieganska, J., Nicolaus Copernicus Univ., Torun (Poland) | Senetra, A., University of Warmia and Mazury in Olsztyn (Poland)
The paper aims at analyzing the development of non-governmental organizations (NGOs) active in the field of culture, arts and the protection of cultural and national heritage, and their importance in shaping the cultural functions of rural areas of Poland in the context of their multifunctional development. The research has been conducted in the Kujawsko-Pomorskie voivodship. The data have been obtained from the foundations and associations database published by the Stowarzyszenie Klon/Jawor (the Klon/Jawor Association), from the statistical data published by the Central Statistical Office in Poland, and from the webpages of the analyzed organizations. The information on the NGOs as well as on the cultural institutions located in the rural areas of the Kujawsko-Pomorskie voivodship has been compared. It turns out that the development of the NGOs in rural areas of the Kujawsko-Pomorskie voivodship tends to have constant growth dynamics and that the presence of these organizations significantly increases the accessibility of cultural sector to residents and contributes to economic diversification. NGOs supporting the cultural sector have been developing only since 2000. Therefore, it can be assumed that the existing NGOs network is in its initial stage, but we may expect it will continue to develop. The NGOs are located mainly in urbanized and environmentally valuable areas. Considering the decreasing number of libraries and the types of initiatives undertaken by NGOs in the rural areas of the Kujawsko-Pomorskie voivodship we should state that the emerging NGOs can remedy current deficiencies and provide rural residents with access to culture.
اظهر المزيد [+] اقل [-]Institutional dependency model for Lithuanian local government in the context of harmonious management
2014
Urmoniene, D., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania) | Zukovskis, J., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania)
Self-government as representing the interests of the local population, social and political life organizing structure, occupies an important place in the political system of most of the countries. It is perceived as the lowest level of territorial division but as the closest one to civil society. Local self-government, in order to adapt to the changes, should focus on the investigation of the specific community issues, opportunities and needs of the development of the area. Currently, more and more relevant for district development stakeholders are becoming local authorities. The relevance of the topic is signified by the fact that the ever-changing environment provides people with new opportunities, but also causes a lot of problems. European district development policy provides new features for countryside areas, such as economic, social, environmental and territorial ones. The changes radically change the concept of local development and activities: from a centralized model of transition to exogenous and endogenous decentralized model, the latter based on local initiatives and resources, and innovations. The research objective is to single out theoretical possibilities for the application of the institutional dependency model in order to ensure the harmonious governance of Lithuanian local authorities. An assumption is made that this is a new opportunity for improving the governance process of territorial self-government. The research is based on the scientific literature, document analysis and synthesis, systematization, case studies, comparative analysis and visualization methods.
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