Automated road survey and pavement management on porous asphalt

Detailed Data Comparison Using VIN for Uncertainty Assesment within the CO2 Monitoring Database Established Under Art.8 of Regulation (EC) no.443/2009

The European Union has committed itself to a 20% reduction of its greenhouse gas (GHG) emissions, and of 30% in case other major economies make comparable efforts. Transport is one of the main emitting sectors, and the only one that continues to grow substantially. Road transport is responsible for the majority of the overall transport emissions...

Additional guidelines for the execution of tyre-road noise measurements with a CPX (Close Proximity) measurement trailer

The Dutch practice of assessment of the noise reducing properties of pavements according to the CPX (Close Proximity) Method has revealed that relatively large differences may occur between test results produced by different CPX operators. Due to these differences road authorities are facing questions and uncertainties about the acoustical...

CPX trailer comparison round robin test data analysis

One of the methods to determine the influence of the road surfaces characteristics on the emission of noise by road traffic is the so-called Close Proximity (CPX) method, which measures the noise emission of the tyre-road contact in the near field of a sound radiating tyre. These measurements are executed with CPX measurement trailers....

Aanvullende richtlijnen voor de uitvoering van band-wegdekgeluidmetingen met een CPX (Close Proximity)-meetaanhanger

In de Nederlandse praktijk van het meten van de geluidsreductie van wegdekken met behulp van de CPX-methode [1] is gebleken dat er tussen de resultaten van verschillende uitvoerders van deze methode relatief grote verschillen bestaan die voor opdrachtgevers leiden tot vragen en onduidelijkheden over de akoestische kwaliteit van de gemeten...

Validatie van de Friction After Polishing test als methode om de polijstgevoeligheid van asfaltmengsels te voorspellen

Met de nieuwe contractvormen die RWS hanteert krijgt de aannemer meer vrijheid en verantwoordelijkheid bij de keuze van de producten die hij aanbiedt. RWS schrijft in principe de functie van een bepaald product voor, maar beschrijft niet tot in detail hoe dat product er moet uitzien. Om vroegtijdig falen op stroefheid uit te sluiten heeft RWS...

Influence of tyre-road noise on road vehicle type approval test results

Optimized qualification protocol on particle cleanliness for EUV mask infrastructure

With the market introduction of the NXE:3100, Extreme Ultra Violet Lithography (EUVL) enters a new stage. Now infrastructure in the wafer fabs must be prepared for new processes and new materials. Especially the infrastructure for masks poses a challenge. Because of the absence of a pellicle reticle front sides are exceptionally vulnerable to...

Comparison of CPX systems with Round Robin Test

The CPX method (ISO/CD 11819-2) is regularly used for assessing the acoustic quality of road surface within the frame work of checking with compliance to contract requirements nd conformity-of-production. The reproducibility of the test procedure is investigated ith a Round Robin test in which 7 operators of CPX systems, coming from Belgium,...

Validated sampling strategy for assessing contaminants in soil stockpiles

Dutch legislation on the reuse of soil requires a sampling strategy to determine the degree of contamination. This sampling strategy was developed in three stages. Its main aim is to obtain a single analytical result, representative of the true mean concentration of the soil stockpile. The development process started with an investigation into...

Apparent ileal dry matter and crude protein digestibility of rations fed to pigs and determined with the use of chromic oxide (Cr2O3) and acid-insoluble ash as digestive markers

Two experiments were conducted to determine apparent ileal DM and crude-protein (CP) digestibilities in rations fed to pigs. An evaluation was made of Cr2O3 and HCl-insoluble ash as digestive markers. In addition, the effects of body weight (BW) on apparent ileal DM and CP (N x 6.25) digestibilities were studied. In Expt 1, thirteen barrows...