18420 research outputs found
Sort by
Real Estate Market Trends in Latvia and the Baltic States
No full textHuman economic activities undertaken to fulfil their wants and needs form the basis of economics. Economic activity is one of the domains of human activity, which is characterised by a wide range of public relations that make up a certain system. To satisfy their needs, human beings perform economic activities, which serve as the basis of economics. Every society attempts to address the key economic problems: to find the most efficient way to allocate production factors and to deal with the limitation or shortage problems caused by unlimited needs and limited resources
Short Paper Proceedings of the 6th IFIP WG 8.1 Working Conference on the Practice of Enterprise Modeling (PoEM2013)
No full textEnterprise Modeling (EM) is discipline that aims to externalize enterprise
knowledge and thus adding to its value. It comprises modelling of the structure,
behavior and organization of the enterprise. Using these models, the
practitioners aim to better understand the enterprise’s functions, as well as to
better link the functions to the models of Information Systems
Engineering of the Hydroxyapatite Cell Adhesion Capacity
No full textThe general adhesion theory is the fundament to explain cell attachment to a bioimlplant surface in a human body. Electrical potential of the surface could be employed to control attachment. The paper demonstrates that the electrical potential may be engineered due to hydrogenation of hydroxyapatite. Such the procedure enhance attachment of osteoblast and generation of tissue. The Sr and Si doped hydrohyapatite demonstrates higher ability to be engineered by hydrogenation in contrast with undoped and Ag doped materials
Synthesis of Nanoporous TiO2-ZrO2-SiO2 Ceramics Using Sol-Gel Technology
No full textThe aim of the research was to prepare nanoporous TiO2-ZrO2-SiO2 ceramic via sol-gel technology and determine structural, mechanical properties and porosity of ceramic. Nanoporous TiO2-ZrO2-SiO2 ceramic was prepared from titanium, zirconium and silicon alkoxides by sol-gel technology. The nanoporous ceramic samples were prepared by sintering of sol-gel derived xerogel powder that was previously homogenized by milling to particle size between 91–354 nm
Characterization of Mg-substituted Hydroxyapatite Synthesized by Wet Chemical Method
No full textMg-substituted hydroxyapatite made up of needle-like and plate-like particles containing different amounts of Mg (between 0.21 wt% and 2.11 wt%) were prepared via wet chemical precipitation method of a homogenous suspension of Mg(OH)2/Ca(OH)2 and an aqueous solution of H3PO4. According to the data of Brunauer–Emmett–Teller method and field emission scanning electron microscopy, high specific surface area Mg-substituted hydroxyapatite was obtained. Specific surface area of as-synthesized powders increased from 94.9 m2 g−1 to 104.3 m2 g−1 with increasing concentration of Mg up to 0.64 wt%. Fourier transform infrared spectroscopy, X-ray powder diffraction, differential thermal analysis, and heating microscopy, were used to evaluate thermal stability and sintering behavior of synthesis products. Increase in concentration of Mg in synthesis products (≥0.83 wt%) promoted decomposition of Mg-substituted hydroxyapatite to Mg-substituted β-tricalcium phosphate after thermal treatment
Piezocapacitance Effect in Polyisoprene/High Structure Carbon Black Composites
No full textPiezoresistance effect of elastomer nanocomposites containing conductive nanoparticles is well known [1,2]. Capacitance (permittivity) changes of polymer nanocomposites, depending on filler concentration, frequency and temperature have also been studied [3,4]. We have not found papers about piezocapacitance effect in elastomer/conductive nanoparticle structures.
In this work we searched for piezocapacitance effect in polyisoprene/high structure carbon (PHCB) composites and pronounced effect was found
Tripartite View on Work-based Learning in Latvia
No full textThe aim of the Erasmus research project “WBLQUAL – An Approach to Qualification Through Negotiated Work Based Learning for the EU” (http://www.wblqual.com) is to produce a more effective way of improving skills and behaviors of employees through the use of academic work-based learning (WBL) programmes. Currently many high education (HE) courses are designed to meet academic quality standards; they sometimes fail to produce the required change in behavior in the workplace that employers seek. Employers are often less interested in qualifications than performance so a tripartite approach - HE institution (HEI), Employer, Learner - is necessary to include the employer's needs within WBL.
The purpose of the study is to gain a deep understanding of the issues, incentives and barriers held by each of 3 participants and to use this understanding to formulate a tri-partite approach to WBL qualifications.
The methodology investigates both employers’ and learners’ views of WBL as well as university culture, legal and academic issues and integrates findings for communicating the benefits of WBL to learners, employers and HEIs.
Required information is derived from one-to-one in-depth interviews, through questionnaires and surveys among each type of tripartite participants.
The paper presents findings in relation to barriers and enablers of WBL in Latvia from the point of view of employers, learners and HEIs as well as possible solution for promotion of this kind of learning
Synthesis of Novel Unsymmetrically Substituted 1,4-Dihydroisonicotinic Acid and its Derivatives
No full textThe synthesis of new unsymmetrically substituted 1,4-dihydroisonicotinic acid bearing cyano and acetyl groups in positions 3 and 5 of the heterocycle has been developed. The methyl, ethoxycarbonylmethyl, and propionyloxymethyl esters of the acid have been obtained. The method of N-alkylation reaction of synthesized 1,4-dihydroisonicotinic acid esters has been elaborated