Search results for "msu"

showing 10 items of 63 documents

Zvaigžņotā Debess: 2013, Vasara (220)

2013

Saturs: Pēdējā "Apollo" ekspedīcija uz Mēnesi ; Vissavienības Astronomijas un ģeodēzijas biedrības Latvijas nodaļa ; M.Gills. ESON – astronomijas popularizēšanas tīkls ; S.Kropa. Dvēsele Atakamas tuksnesī ; M.G. Īsumā: ESO Astro Camp Eiropas vidusskolēniem 2013.gada decembrī ; A.Alksnis. Atklāta vēl viena no Saulei vistuvākajām kaimiņzvaigznēm ; A.Alksnis. Tuvēja zvaigzne, kas ir izveidojusies jau drīz pēc Lielā Sprādziena ; A.Alksnis. Čeļabinskas superbolīds – simtgades notikums ; A.Alksnis. Nevis pārsteidzoša nova, bet gan kvazāra uzliesmojums ; I.Eglītis. Orius – Baldones observatorijā atklātais centaurs ; R.Misa. Denisa Tito Marsa iedvesmas fonds ; A.A. Īsumā: Ap zvaigzni Gleznotāja Bet…

Otrais seminārs „Astronomijas izglītība Latvijā”ESON – astronomijas popularizēšanas tīklsESO Astro Camp vidusskolēniemAptauja’2012 – izlozes rezultātiSenie ziemeļbriežu mednieki Latvijas teritorijāBulīšu akmens meteorītam – 150Doc. E.Grinbergs – uzruna 15.06.1978.LU Astronomijas institūts 2012.gadāmāksla-skaitļi-astronomija [Homo sapiens]Saules pulkstenis Origo Universi Rīgas Stacijas laukumāM 31 nova No 21 – kvazāra uzliesmojumsLU fizikas docents Valdis RēvaldsCentaurs Orius – atklāts Baldones observatorijāČeļabinskas superbolīdsDubultzvaigzne WISE 1049-5319Atakamas Lielais mm/submm režģis ALMA – atklāšanaXVIII Starptautiskā astronomijas olimpiāde ViļņāZvaigžņu tēma mākslā – dzeja un zīmējumi:NATURAL SCIENCES::Physics::Astronomy and astrophysics [Research Subject Categories]Pilnmēness fāzes un Mēness aptumsumu laikiZvaigznes Gleznotāja Beta planēta bDenisa Tito Marsa iedvesmas fondsAstronomam Matīsam Dīriķim – 902012.g. 14.nov. pilnais Saules aptumsums AustrālijāNoteiktības principsLatvijas 63.matemātikas olimpiāde – 3.posma uzdevumiAstronomiskās parādības – 2013.gada vasaraZentas Alksnes bērnības atmiņas – izvilkumsZvaigzne HD 140283Amatierastronomijas seminārs „Ērgļa Hī”LVU astronomijas studenti – 1952.gada diplomandiPirmatnējā zvaigzne LRLL 54361
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Estimation of Passenger Car Equivalents for single-lane roundabouts using a microsimulation-based procedure

2017

Calibration of microscopic traffic simulation models for single-lane roundabouts.Use of a meta-analytical estimation of critical and follow up headways.Use of a genetic algorithm-based procedure.Calculation of passenger car equivalents for single-lane roundabouts. Passenger car equivalents for heavy vehicles are required to carry out capacity calculations and perform operational analysis of any road entity (roadway segments or intersections). At single-lane roundabouts, the constraints to the vehicular trajectories imposed by the curvilinear geometric design and the driver's gap acceptance behaviour are expected to produce an impact of the heavy vehicles on the quality of traffic flow diffe…

Passenger car equivalent050210 logistics & transportationComputer science05 social sciencesGeneral EngineeringMicrosimulationTraffic simulation02 engineering and technologyTraffic flowAimsunAutomotive engineeringComputer Science ApplicationsGenetic algorithmSettore ING-INF/04 - AutomaticaArtificial IntelligenceCalibration0502 economics and businessPath (graph theory)Roundabout0202 electrical engineering electronic engineering information engineeringSettore ICAR/04 - Strade Ferrovie Ed AeroportiSingle-lane roundabout020201 artificial intelligence & image processingPassenger car equivalentMicroscopic traffic simulation modelExpert Systems with Applications
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Zvaigžņotā Debess: 2009, Pavasaris (203)

2009

Contents: E.R.Mustel, President of the Astronomical Council of the USSR Academy of Sciences. Congratulations to Editorial Board of “Zvaigžņotā debess” ; Z.Alksne. Gould’s Belt ; I.Daube. At the Radioastrophysical Observatory of the Latvian Academy of Sciences ; Z.Alksne, A.Alksnis. Lopsided Galaxies ; A.Alksnis. HII Region Gum 29 – a Stellar Nursery ; D.Docenko. On Collision of Asteroid 2008 TC3 with the Earth ; V.Lapoška. On „Leap Second” ; I.Vilks, M.Gills. Beginning of the International Year of Astronomy in Paris: Impressions by Latvian Delegates ; J.Jaunbergs. Equatorial Ridge on Iapetus ; M.Sudārs. Space Shuttle Is Not Likely to Retire Next Year ; I.Vilks. Planet Satellite Names in Lat…

Planētu pavadoņu latviskie nosaukumiHII apgabals Gum 29Saules aptumsums - novērojumi - 2008. gada 1. augusts RīgaPublikācijas par astronomijuSaturna pavadonis Japets – kalnu joslaGalileja tālskatis – ESA/NASA Habla Kosmiskais teleskopsAstronomija skolāZiemeļvalstu optiskais teleskops (Nordic Optical Telescope) Kanāriju salāsApsveikums „Zvaigžņotās debess” redakcijai„Liekā” sekundeDr.habil.phys. Juris Tambergs (1942-2008)Latvijas PSR ZA Radioastrofizikas observatorija – vēstureAicinājums astronomijas atbalstītājamRīgas Politehnikuma observatorijas tornis – vēstureStarptautiskais Astronomijas gads 2009Fizikas autodidakts Roberts KrastiņšSpirāliskās galaktikas – asimetrijaNovērojumi Rīgas Politehnikuma tornī - pirmā publikācijaĒrgļa Sigma seminārs – daļējs Mēness aptumsumsVisuma tēma filatēlijā – kosmiskās ēras sākumsSaules aptumsums - novērojumi - 2008.gada jūlijs SibīrijaPublisko demonstrējumu observatorija RāmkalnosDr.habil.math. Aivars Lorencs - intervijaAstronomiskās parādības - 2009Asteroīda 2008 TC3 sadursme ar ZemiNASA Space Shuttle programmas pagarinājumsLatvijas jauno matemātiķu izlase - 2008.gads“Noteikumi par līgumu starp Latvijas Republikas valdību un Eiropas Kosmosa aģentūru par sadarbību kosmosa jomā miermīlīgiem mērķiem” - projektsLU profesors Edgars Lejnieks (1919-1934)Jānis Klētnieks „Mūžības valdnieki”Ūdens marsiešiemLatvijas atklātā skolēnu astronomijas olimpiāde
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Environmental Performance Evaluation at Urban Roundabouts

2021

Transformation toward greener, healthier and safer management of urban mobility demand is needed soon. Smart tools are available to assess the impact of new infrastructural projects and road facilities also from an environmental point of view. In this pilot study pollutant emissions at a sample of urban roundabouts were estimated employing the Vehicle Specific Power methodology which needs second-by-second speed profiles both gathered in the field and simulated in AIMSUN. The versatility of the micro-simulation model for a calibration aimed at improving accuracy of the emissions estimates was tested in order to ensure that second-by-second trajectories experienced in the field properly refl…

RoundaboutEnvironmental scienceSettore ICAR/04 - Strade Ferrovie Ed AeroportiAir emissionsAIMSUNVSP methodology
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Zvaigžņotā Debess: 2021, Pavasaris (251)

2021

Saules sistēmaMobīlā lietotne planētu novērojumiem:NATURAL SCIENCES::Physics::Astronomy and astrophysics::Astronomy [Research Subject Categories]Aresibo radioteleskopsAmatieru astronomiskie novērojumiVisuma izpēteDebess apskatsSaules un Mēness aptumsumiAmerikas Astronomijas biedrības 237. konferenceSudrabainie mākoņiMazo Vējdzirnaviņu galaktika
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Zvaigžņotā Debess: 2006, Rudens

2006

Latvijas Zinātņu akadēmija, Latvijas Universitāte

Sausais ledusLatvijas Zinatņu Akadēmijas Observatorija - 1946-1996Planētu apriņķošanas periodiLīgatnes meteorītsZvaigžņotā debess rudenīKrustvārdu mīklaTautasdziesmasALOS pirmais attēlsHalo parādībaSudrabainie mākoņiBrūnie punduriMatemātikas olimpiādes - uzdevumu atrisinājumiStruves ģeodēziskie punktiSaules burasNovasSaules sistēmas apgūšanaMarsa mākoņiKomēta 73P/Schwassmann-Wachmann 3Titāna paisuma vējiPilns Saules aptumsumsAstronomija - AntarktikaMelnie caurumiLomonosovs – Mēness krāterisAstrofizikas observatorija - vēstureKosmiskais starojums
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Innovative Applications and Experiments for the Protection of Archaeological Sites

2020

Nowadays, the protection in situ, the enhancement and the fruition of archaeological sites are issues that are even more relevant, if we take into account the effects caused, in recent decades, by climate change both on the conservation of the most fragile artefacts and on the well-being of visitors. New questions related to the ‘recover of identity’ are raised by the relationships that the protection interventions establish with the environmental context (external) and with the ancient ruins (internal), imposing an interpretation of the project as a union of landscape, morphological, climatic, technical, use and management aspects, or by requiring a holistic and integrated approach, from a…

Settore ICAR/12 - Tecnologia Dell'Architetturamsustainability adaptivity biomimesis archaeological shelters identity and context
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Genetic algorithm-based calibration of microscopic traffic simulation model for single-lane roundabouts

2017

A calibration procedure for microscopic simulation models based on a genetic algorithm is proposed. Focus is made on single-lane roundabouts for which many random factors such as gap- acceptance affect operations. A comparison is performed between the capacity functions based on a meta- analytic estimation of critical and follow up headways and simulation outputs of a roundabout built in Aimsun microscopic simulator. Aimsun parameters were optimized using the genetic algorithm tool in MATLAB® which automatically interacted with Aimsun through a Python interface. Results showed that applying the genetic algorithm in the calibration process of the microscopic simulation model, a good match to…

Settore ING-INF/04 - AutomaticaSettore ICAR/04 - Strade Ferrovie Ed AeroportiSingle-lane roundabout Aimsun Genetic Algorithm
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Zvaigžņotā Debess: 2017/18, Ziema (238)

2017

Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: I.Vilka. Starry Sky and Birds’ Journeys (abridged) ; N.Cimahoviča. Spirals of Saturn’s Rings (abridged) ; I.Šmelds. V Readings of Friedrich Zander ; DEVELOPMENTS in SCIENCE: K.Schwartz. Most Distant Galaxy Clusters and 3D Structure of the Universe ; DISCOVERIES: M.Gills. The Day when Multi-Messenger Astronomy Was Announced ; I.Pundure. ESO Telescopes and Hubble Observe the Source of Gravitational Waves for the First Time ; I.Eglītis. Asteroid “Balklavs” ; SPACE RESEARCH and EXPLORATION: R.Misa. Mission of Cassini – Discoveries to the Very End ; J.Jaunbergs. The Icy World Tethys ; OBSERVATORIES and INSTRUMENTS: M.Gills. The Giant Radio Telescope…

Starptautiskās astronomu savienības 332.simpozijsLatvijas pastmarka ZMP “Venta-1”Cassini misija – intervija ar Cassini komandas pārstāvjiemGW170817 – gravitācijas viļņu notikumsSaturna pavadonis ledus pasaule TētijaLU Astronomijas institūts 2016LPSR ZA Astrofizikas laboratorijai – 60Debess spīdekļi – 2017./18.gada ziemaEPSC2017 – sesija par Starptautisko Mēness dekādiA.Alkšņa zinātnisko darbu saraksts (1981-2009)Edgaram Mūkinam – 70Urāns – kosmiskā evolūcijaGalaktiku kopas – Visuma trīsdimensionālā struktūraLielais Amerikas Saules aptumsums 2017 – novērojumi ekskursijas:NATURAL SCIENCES::Physics::Astronomy and astrophysics [Research Subject Categories]Aresibo radioteleskops – viesuļvētras Irma un MarijaIvaram Šmeldam – 70Asteroīds “Balklavs”ESO ELT – Eiropas Dienvidobservatorijas teleskopa E-ELT nosaukuma maiņaEventech pulkstenis Mēness lāzerlokācijas instrumentamMēness ekspedīciju F-1 dzinējiErnestam Grasbergam – 80Arturam Balklavam-Grīnhofam – 85Latvijas 42.atklātā fizikas olimpiāde18.astronomijas amatieru salidojumsDaudzvēstnešu astronomija – jauna ēra astronomijāPastmarkas Latvijas astrofizikai – Latvijas simtgades sērija
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Calibrating a microscopic traffic simulation model for roundabouts using genetic algorithms

2018

The paper introduces a methodological approach based on genetic algorithms to calibrate microscopic traffic simulation models. The specific objective is to test an automated procedure utilizing genetic algorithms for assigning the most appropriate values to driver and vehicle parameters in AIMSUN. The genetic algorithm tool in MATLAB® and AIMSUN micro-simulation software were used. A subroutine in Python implemented the automatic interaction of AIMSUN with MATLAB®. Focus was made on two roundabouts selected as case studies. Empirical capacity functions based on summary random-effects estimates of critical headway and follow up headway derived from meta-analysis were used as reference for ca…

Statistics and Probability050210 logistics & transportationGenetic algorithm traffic microsimulation AIMSUN passenger car equivalent roundaboutComputer science05 social sciencesReal-time computingGeneral EngineeringTraffic simulation02 engineering and technologySettore ING-INF/04 - AutomaticaArtificial Intelligence0502 economics and business0202 electrical engineering electronic engineering information engineeringSettore ICAR/04 - Strade Ferrovie Ed Aeroporti020201 artificial intelligence & image processingJournal of Intelligent & Fuzzy Systems
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