Photo-emission properties of quasi-one-dimensional conductors

We calculate the self-energy of one-dimensional electron band with the three-dimensional long range Coulomb interaction within the random phase approximation, paying particular attention to the contribution coming from the electron scatterings on the collective plasmon mode. It is shown that the spectral density has a form of wide feature at thr frequency scale of the plasmon frequency, without the presence of quasi-particle delta-peaks. The relevance of this result with respect to experimental findings and to the theory of Luttinger liquids is discussed.Comment: 4 pages, 2 figure

MORPHOLOGICAL CHARACTERISTICS AND YIELD OF CARROT (DAUCUS CAROTA L.) GROWN WITH APPLICATION OF MICROBIOLOGICAL FERTILIZERS

Sustainable and organic production systems in which the application of synthetic products are partially or completely excluded are becoming increasingly popular and are opening more opportunities for usage of microbiological fertilizers. Therefore this research is aimed at determining the impact of two types of microbial fertilizers on the morphological characteristics and the yield of carrot,to test the possibility for their extensive use.Experiment was set on open field in the area of the village Jurumleri, Skopje, during 2013. As research material was used carrot (Daucus carota L.), hybrid Maestro. The variants were set according to the type of microbiological fertilizer: Ø control - not applied microbiological fertilizer, variant 1 - treatment with microbiological fertilizer Micro - I Vita containing several groups of azotobacter, nitrifying microorganisms and phosphor-soluble microorganisms; variant 2 - treatment with microbiological fertilizer Micro - Vita II containing azotobacter, nitrifying microorganisms, phosphor-soluble microorganisms and iron.From the morphological characteristics were measured the weight of whole plant,which ranged from 73,17 g in the control to 84,00 gin variant 1,root weight,which ranged from 63,83 g in the control to 74,67 g in variant 1, lengthwhich ranged from 17,69 cm in the control to 18,28 cmin variant 1, widthwhich ranged from 2,22 cm in the control to 2,39 cm in variant 1 and index of the rootwhich ranged from 7,65 in variant 1to 7,99 gin the control. According to the results statistically significant differenceswere determined between the variants in weight of whole plant and rootweight. The highest yield was obtained in variant 1from 53,77 t/ha, in variant 2 the yield was 46,32 t/ha, while the lowest yield was obtained in the control from 45,96 t/ha. Also statistically significant difference was determined in the yield between the variants

POSSIBLE DEVELOPMENTS ISSUES IN ORGANIC VEGETABLE PRODUCTION IN R. OF MACEDONIA

Due to the presence of rural regions clean from industry and pollution, the usage of own inputs in the crop production, Republic of Macedonia has favorable pre-conditions for development of organic agriculture. Аs a result of that the certified area under organic production increased from 226 ha in 2005 to 3239.88 ha in 2016, while the number of farms from 50 increased to 562, for the same period. But despite satisfactory conditions for the development and increase of the organic production in RM, very experienced vegetable growers with long tradition of cultivating several crops there are still a number of issues that obstruct its development and need careful attention and effort by all stakeholders in the process of organic production in order to overcome them. Among these limitations primarily are included: lack of organic seeds and other inputs, lack of machines forcultivation of the soil, lack of markets for selling the products, inappropriate application of agrotechnical measures (cultivation, crop rotation, plant protection, fertilizing, irrigation, harvest), disconnection of farmers in rural areas, poor infrastructure to the city markets, failure to meet market and consumer requirements regarding quality, quantity and continuous supply of organic plant products, lack of information for the new technology in the organic production, inadequate transportation, lack of storage facilities and very important package, economic crisis, etc. Although some of the plant protection products and fertilizers for organic production are present on the market, the reproductive material (seeds) still remains to be the largest constrain for organic vegetable production. These limitations are probably the reason for low participation of organicvegetable production in the overall organic scheme. In 2016 there are only 93.17 ha (in conversion and organic), that is only 2.87% of the total organic production. As future steps for accelerating the development of organic production in Macedonia must be considered: connecting of the farmers that have a common interest in associations, cooperatives, in order to supply cheaper input materials, group certification, support of trainings, information technology and so on

Photo-emission properties of quasi-one-dimensional conductors

We calculate the self-energy of the one-dimensional electron band with the three-dimensional long-range Coulomb interaction within the random phase approximation, paying particular attention to the contribution coming from the electron scatterings on the collective plasmon mode. It is shown that the spectral density has a form of wide feature at the frequency scale of the plasmon frequency, without the presence of quasi-particle $\delta$-peaks. The relevance of this result with respect to experimental findings and to the theory of Luttinger liquids is discussed

Diversity in all its forms: IPC4 as an invaluable opportunity for STEPPE grant recipients

The vigor and relevance of contemporary paleontological research were demonstrated at the 4th International Palaeontological Congress (IPC4), held in e city of Mendoza, Argentina from September 28 to October 3, 2014. The research presented at IPC4 was highly diverse in its topical, organismal, geographical, and temporal coverage. The workshops, symposia, short courses, and field trips were similarly varied, along with the conference attendees who hailed from 50 different countries and represented many different stages of their paleontological careers, from students to emeritus professors. IPC4 provided many professionals the first opportunity to visit Argentina, South America and interact with experts from different fields