18420 research outputs found
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Studiju procesa uzlabošana apģērbu ražošanas profesionālo prasmju pilnveidošanai
No full textRakstā pētītas Rīgas Tehniskās universitātes Tekstilmateriālu tehnoloģiju un dizaina institūtā īstenotā studiju procesa apģērbu ražošanas profesionālo iemaņu pilnveidošanai uzlabošanas iespējas. Lai uzlabotu studiju procesu un tā rezultātus, tika apsvērts ļaut studentiem piedalīties ikgadējā studentu modes skatē ne tikai ar diplomdarba kolekcijām, bet arī ar studiju procesa rezultātiem. Kolekciju sagatavošanas darbi ļauj praktiski izprast reālos, apģērbu tirgū pastāvošos, apģērbu izveides principus, secību un apstākļus. Studiju procesa izmaiņu mērķis ir motivēt studentus ar lielāku atdevi un ieinteresētību pildīt nospraustos studiju mērķus un uzdevumus. Rakstā izskatītas ar priekšlikuma realizāciju saistītas problēmas un to risinājuma varianti, kā arī ieguvumi un sasniegumi izmaiņu realizēšanas gadījumā
Latvijas mālu ģeopolimerizācijas iespējas
No full textŠajā darbā tiek apskatītas dažu Latvijas mālu aktivācijas iespējas ar nolūku iegūt jaunu materiālu - ģeopolimēr
„f“ i „h“ literu problema latgalīšu volūdā
No full textRakstīnī stuosteits ap literu (i skonu) f i h problemu latgalīšu volūdā. Itūs skonu nikod navā
bejs nivīnā latgalīšu vītrunā, svešūs vuordūs runuotuoji jūs vysod aizmeja ar cytim skonim.
Tymā pošā laikā latgalīšu rokstūs literi f i h irā montuoti vysod: nu pyrmuos zynomuos
gruomotys Evangelia toto anno da myusu dīnu. Kū dareit itamā situacejā: voi dasaturēt pi
runys volūdys, voi pasadūt cytu volūdu mīdzīĦam? Autors analizej daudzejus olūtus – tautys
dzīsmis, senejūs tekstus, myuslaiku literaturu, vītrunu aizrokstus, a taipoš cytu tautu pīredzīni
itymā vaicuojumā.
Anotācija
Rakstā stāstīts par burtu (un skaĦu) f un h problēmu latgaliešu valodā. Šīs skaĦas nekad nav
bijušas nevienā latgaliešu izloksnē, svešos vārdos runātāji tās vienmēr aizvietoja ar citām
skaĦām. Tai pat laikā latgaliešu rakstos burti f un h ir izmantoti vienmēr: no pirmās zināmās
grāmatas Evangelia toto anno līdz mūsu dienām. Ko darīt šinī situācijā: vai pieturēties pie
tautas valodas, vai Ĝauties citu valodu spiedienam? Autors analizē daudzus avotus –
tautasdziesmas, senos tekstus, mūsdienu literatūru, izlokšĦu pierakstus, kā arī citu tautu
pieredzi šinī jautājumā.
Аннотация
В статье рассказывается о проблеме букв (и звуков) f и h в латгальском языке. Этих
звуков никогда не было ни в одном латгальском наречии, в заимствованных словах
носители языка их всегда заменяли другими. В то же время в латгальских изданиях
буквы f и h употреблялись всегда: с первой известной книги Evangelia toto anno до
наших дней. Что делать в данной ситуации: придерживаться устного языка или
поддаться натиску других языков? Автор анализирует разные источники – народные
песни, древние тексты, современную литературу, материалы диалектологических
экспедиций, а также опыт других народов по решению данного вопроса
Multi-Agent Robotic System Architecture for Effective Task Allocation and Management
No full textLarge number of autonomous robot solutions exists for various missions and domains. These robots are sufficient for the missions they are built for. At the same time each of them has limited functional and physical capabilities. Multi robot systems can be used to remove these limits. However it is true only in case when the system ensures effective interaction among the robots i.e. enables their social behaviour. Usually it is hard to implement such capabilities directly into robots due to functional and physical limitations and heterogeneity of the team. One of possible solutions is to implement management systems outside the robots. It should decompose tasks, allocate subtasks to specific robots and monitor the execution of the assigned tasks. In order to avoid inherent drawback of fully centralized systems a significant level of autonomy has to be preserved. Intelligent agents fulfil these requirements. Therefore we propose a general multi-agent system’s architecture for multi-robot management system for applications with a common goal. It can be used to implement various purpose multi-robot systems from existing single operating robots without major changes in their software and hardware. A vacuum cleaning problem of a large area is considered as an application case
Reactions of Methoxybenzylidene Derivatives of 2,2-Dimethyl-1,3-Dioxane-4,6-Dione and Their Saturated Analogs with Certain Nucleophilic Reagents
No full textThe reactions of the methoxybenzylidene derivatives of 2,2-dimethyl-1,3-dioxane-4,6-dione and their saturated analogs with potassium hydroxide in methanol, ammonia, and hydrazine hydrate were realized. The 1,2-bis(methoxybenzylidene)hydrazines, amides, and hydrazides of methoxybenzylidene-malonic acid, suitable for use as structural blocks in the synthesis of various structures based on them, were prepared and characterized
Reduction of Output Voltage Ripples in Frequency Modulated Power Converter
No full textIn the paper the closed-loop frequency modulated (FM) buck converter output voltage ripples are examined theoretically, using
SIMULINK simulations and experimentally. A closed-form expression to calculate and analyze the peak-to-peak output voltage ripples
in continuous conduction mode is derived and confirmed experimentally. The expression can appreciably simplify the analysis of the
effect of FM on peak-to-peak output voltage ripples of FM buck converter. The effect of duty ratio and the output power on the output
voltage ripples of the FM buck converter is also analyzed. Some useful recommendations to mitigate the ripples effectively are
proposed
Rational Structure of Cable Truss
No full textOne of the main problems of suspended cable structures is initial shape change under the action of non uniform load. The problem can be solved by increasing of weight of construction or by using of prestressing. But this methods cause increasing of materials consumption of suspended cable structure.
The cable truss usage is another way how the problem of shape change under the action of non uniform load can be fixed.
The cable trusses with the vertical and inclined suspensions, cross web and single cable were analyzed as the main load-bearing structures of suspension bridge.
It was shown, that usage of cable truss allows to reduce the vertical displacements up to 32% in comparison with the single cable in case of non uniformly distributed load. In case of uniformly distributed load single cable is preferable
Rational Geometrical Parameters of Cable Truss for Suspension Bridge
No full textSuspended cable structures are characterized by reduced dead weight and increased span due to efficient geometrical shape, when all elements are tensioned and can’t lose their stability.
But the initial shape change under the action of non uniform load is the problem of suspended cable structures. Increasing of structural weight is probable way to fix a problem. But using of this method suppress usage of modern materials with increased specific strength in civil and bridge engineering.
Prestressed cable truss usage is another way how the problem of shape change under the action of non uniform load can be fixed.
The cable truss with cambered top and bottom chords was offered instead of single cable for prestressed suspension bridge. The rational geometrical parameters of cable truss shape and web were found. The structure was checked under the different types of loading.
It was shown, that usage of cable truss (Fig.1) as the main load-bearing structures of suspension bridge allows reducing the vertical displacements up to 32% in comparison with the single cable in case when the traffic load is applied to the half of suspension bridge span and the relation of traffic load and permanent load is equal to 1.4. In the case of uniformly distributed load single cable is preferable.
The results were checked on the physical model of cable truss for suspension bridge