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Опыт АО "Ригас Силтумс" в реконструкции водогрейных котлов КВГМ-50 и КВГМ-100
No full textūdenssildkatlu KVGM modernizācijas pieredze ar zemu NOx izmešu degļie
Synthesis and Characterization of Sb-Substituted (K0.5Na0.5)NbO3 Piezoelectric Ceramics
No full textBezsvina pjezoelektriskā keramika KNN tika sintezēta ar tradicionālo keramikas izgatavošanas metodi. Lai veicinātusaķepšanas pakāpi un uzlabotu blīvumu, līdz ar to palielinot īpašības, Nb tikai aizvietots ar Sb. Modificētās keramikas uzrādīja ievērojami labākas dielektriskās un pjezoelektriskās īpašības
Processing of Polyisoprene-Nanostructured Carbon Black Composite Cells for Pressure Sensors
No full textNatural rubber latex is used as a matrix material. Nanostructured carbon black (mean particle diameter - 30 nm, dibuthyl phthalate adsorption - 380ml/100g, specific surface - 950 m2/g) is used as filler. Mixing was performed on cold rolls in Baltic Rubber factory. Raw material was cured in 1*15*120mm slices between two 50μm thick brass sheets in stainless steel mold, using different mold pressures from 10 to 100kg/cm2 by step of 10. Resulting product was carefully cut into 10 similar pieces by dimensions of 1*10*15mm each. Each piece represents a sample - piezo resistant sensor cell with regular brass electrodes. The specific electrical resistance of samples was measured in unstressed state (Fig.1). Finally, the piezo resistive sensitivity was determined and conclusions about influence of mold pressure on sensing properties were made
Detection of Trends of Internet Traffic Using Sequential Patterns
No full textWe propose a new method of possible trend detection in the internet traffic by using sequential pattern analysis. The main steps of this method, such as the template pattern discovery in time-series data and pattern comparison and matching for sequential pattern analysis, are analyzed and the possible constraints and problems are pointed. Experimental data are depicted and future research subjects are described. Ill. 6, bibl.
A Method for Determining the Elastic Modulus of Polymer Materials by Using Thin-Walled Cylindrical Specimens
No full textThe Main Factors of Regional Competitiveness and the Importance of International Indexes in Its Evaluation
No full textLīdz ar latvijas integrāciju ES, reģionu konkurētspējas novērtēšanas problēma kļūst arvien aktuālāka. Reģionālās konkurētspējas novērtēšana ir sarežģīta, jo nav vienas vispārpieņemtas konkurētspējas definīcijas reģionu līmenī. Ir vairāki faktori, kas ietekmē reģionu konkurētspēju un ir nepieciešams tos visus ņemt vērā, novērtējot reģiona konkurētspējas priekšrocības
Modelling the On-line Traffic Estimator in OPNET
No full textAllocation techniques are needed to provide these guarantees as efficiently as possible since resources are limited. To cope with this demand, the networks need dynamic and measurement-based resource allocation algorithms. For this task, the choice of appropriately accurate but also practically implementable algorithms is crucial. For network links shared through statistical multiplexing, adaptive bandwidth allocation algorithms based on traffic measurements can achieve important gains.
In this context, it is very important to choose measurement methods that satisfy stringent constraints in terms of both accuracy and complexity. The measurement time scales have critical effect of on the performance. We proposed an approach overcoming this dependency by adjusting the measurement time scale dynamically in accordance to traffic parameter. The paper covers issue with measured traffic store model with the following parameters estimation
Researches on Efficiency Increasing Problems for Variable Speed Drive Screw Compressor
No full textRaksts ir vērsts uz šķidrumplūsmas skrūves kompresora darbības efektivitātes analīzi un raksturojošo rādītāju uzlabošanu darbībā ar mainīgu rotora rotācijas ātrum
Some Cutting Parameter Renovation Aspects for Cutting Tool Materials
No full textRaksts veltīts griezējinstrumentu ģeometrijas parametru atjaunošanas jautājumiem un pareizas instrumentu ģeometrijas nodrošināšanas problēmā
Offer of Safety Equipment Enhancements for Un-Regulated Crosswalks in Latvia
No full textPresent article overviews main principles of arrangement of un-regulated crosswalks and the division of the safety equipment. Considering present situation in Latvia, where a level of un-regulated crosswalks’ equipment is minimal but the location of the crosswalks often conflicts with the basic principles of road traffic safety, several enhancements were presented, including usage of non-activated as well as individually activated systems. Systems of that kind have never been used on the roads of Latvia before, but in conformity with foreign practice, according to which some of these solutions appeared to be successful, implantation of those or similar systems in Latvia could significantly improve the safety level of pedestrians