Investigation of properties of lubricants in locomotive Diesels

This paper describes experimental investigation of lubricant properties used in locomotive engines. The workbench for experimental investigation is described, which presented theoretical background and technique of the experiment. The results are analyzed and presented graphically. Their interpretation shows the direction for further investigation. Final conclusions of the results are made

RESEARCH OF BROKEN WIRE ON THE ROPE SURFACE USING DYNAMIC METHOD / LYNO IŠORINIAME SLUOKSNYJE NUTRŪKUSIŲ VIELŲ TYRIMAS, TAIKANT DINAMINĮ METODĄ

This paper is intended to reveal possibilities to research of brokenwire on the wire ropes using dynamic properties of tensedwire rope and research properties of broken wire in piece ofwire rope when it is affixed on the wire rope in special testrig. During experimental test wire rope and broken wire on thetensed wire rope dynamic properties was estimated dependingon excitation frequency, also including affixed weight on thetensed wire rope dynamic properties. Finally, results are givenand conclusions are made

ANALYSIS OF A FLAT-PLATE SOLAR COLLECTOR / PLOKŠČIOJO SAULĖS KOLEKTORIAUS TYRIMAS

The paper deals with a flat plate solar collector. The experiment was conducted using the finite element method and described the theoretical effectiveness of the flat solar collector as well as the factors that produce the major loss of heat. Investigation has concentrated on several different transparent surfaces used for determining the efficiency of the collector: 5 mm thick transparent glass and 5 mm thick transparent glass coated with a film of 120 μm. Santrauka Darbe tirtas plokščiasis saulės kolektorius. Baigtinių elementų metodu nustatytas teorinis saulės kolektoriaus efektyvumas ir didžiausius šilumos nuostolius lemiantys veiksniai. Atliktas eksperimentas, kurio metu ištirtas kolektoriaus efektyvumas naudojant skirtingas skaidrias dangas: 5 mm skaidrų stiklą ir 5 mm skaidrų stiklą su 120 μm storio papildoma plėvele. Raktiniai žodžiai: saulės kolektorius, šiluma, baigtiniai elementai, eksperimentiniai tyrima

ALGORITHM FOR CHOOSING TRACTION ROLLING-STOCK FOR RAILWAY LINE RAIL BALTICA / PREKINIŲ ŠILUMVEŽIŲ MAGISTRALEI „RAIL BALTICA“ PARINKIMO ALGORITMAS

The article analyses traction rolling-stock for freight transportation presently used by AB Lietuvos geležinkeliai. The paper explores and compares technical data on the above mentioned rolling-stock and estimates exploitation expenses. Following an assessment of forecasting freight flows on the future railway line Rail Baltica, an algorithm for selecting traction rolling-stock is proposed. The efficiency of locomotives operating on the railway is determined taking into account three multi-criteria evaluation methods: the sum of ratings, simple additive weighting and geometric mean method. Locomotives are estimated in accordance with technical, economic and ecological aspects. The results of possible performance efficiency of rolling stock have been determined changing weight coefficient values of the criteria. Santrauka Straipsnyje nagrinėjami šiuo metu AB ,,Lietuvos geležinkeliai“ kroviniams vežti naudojami traukos riedmenys: analizuojami ir lyginami techniniai duomenys, vertinamos eksploatavimo sąnaudos. Įvertinus krovinių srautų prognozes tiesiamoje ,,Rail Baltica“ geležinkelio magistralėje, pasiūlytas traukos riedmenų kroviniams vežti parinkimo algoritmas. Šilumvežių šioje magistralėje naudojimo efektyvumas nustatomas trimis daugiakriterio įvertinimo metodais: vietų sumos metodu, rodiklių įverčio metodu ir geometrinio vidurkio metodu. Šilumvežiai vertinami techniniais, ekonominiais ir ekologiniais aspektais. Keičiant kriterijų svarbos koeficientų reikšmes, nustatyti skirtingi riedmenų panaudojimo efektyvumo rezultatai. Raktiniai žodžiai: geležinkelio traukos riedmenys; magistralė ;;Rail Baltica“; eksploatacinės sąnaudos; daugiakriterio vertinimo metodai; eksploatavimo efektyvuma

Indoor-outdoor relationship of submicron particulate matter in mechanically ventilated building: Chemical composition, sources and infiltration factor.

To evaluate the impact of outdoor particulate pollution on indoor air quality, the chemical composition and sources of submicron aerosol particles (PM1) were studied indoors and outdoors. Measurements were carried out during the heating season from October 15, 2020, to February 8, 2021, at the Center for Physical Sciences and Technologies in Vilnius, Lithuania. Online measurements of PM1 chemical composition were performed using an Aerosol Chemical Speciation Monitor (ACSM (organics, sulfate, and nitrate)) and an Aethalometer (equivalent black carbon, BC). In parallel with the online measurements, filter-based elemental composition and 14C analysis of PM1 were performed using a Particle-Induced broad-beam X-ray Emission (PIXE) and a Single Stage Accelerated Mass Spectrometer (SSAMS), respectively. The source apportionment results showed a dominant contribution of biomass burning to the total carbonaceous aerosol particles, including primary (30%) and secondary (40%) fractions. According to the enrichment factors, the main source of trace elements was road dust resuspension (30%), while anthropogenic emissions accounted for only 13% of trace elements. The infiltration factor (Finf) of all studied PM1 constituents was low (Finf∼0.03). This result indicates that the three-stage building filter system (G4-F7-F9) provides high protection against particle pollution of different origins and significantly reduces indoor exposure to PM1. The changed chemical composition of indoor PM1 can be attributed to species-specific evaporation and some minor indoor sources