scholarly journals Preliminary results of EURAMET Rockwell comparison between INRiM and UME (EURAMET.M.H-S1.A.B.C)

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 256
Author(s):  
C. Kuzu ◽  
A. Germak ◽  
C. Origlia ◽  
E. Pelit
Keyword(s):  
National Metrology Institute ◽  
Rockwell Hardness ◽  
Preliminary Measurement ◽  
Preliminary Results ◽  
Measurement Results

A bilateral supplementary comparison between INRiM (National Metrology Institute of Italy) and UME (National Metrology Institute of Turkey) had been decided to be organized in the field of Hardness Metrology to determine the consistency of the national hardness standards in both countries realizing Rockwell Hardness measurements in accordance with ISO 6508-1:2016 and ISO 6508-3:2015 standards. In this paper the procedure and preliminary measurement results of the bilateral EURAMET supplementary comparison between the two laboratories are explained.

Methods and preliminary measurement results of liquid Li wettability

2014 ◽  
Vol 85 (2) ◽  
pp. 023506 ◽  
Author(s):  
G. Z. Zuo ◽  
J. S. Hu ◽  
J. Ren ◽  
Z. Sun ◽  
Q. X. Yang ◽  
...  
Keyword(s):  
Preliminary Measurement ◽  
Measurement Results

scholarly journals A new design of Rockwell-Brinell-Vickers hardness standard machine at UME

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 230
Author(s):  
C. Kuzu ◽  
E. Pelit ◽  
I. Meral
Keyword(s):  
Vickers Hardness ◽  
Laser Interferometer ◽  
Measurement Unit ◽  
National Metrology Institute ◽  
Successful Implementation ◽  
Rockwell Hardness ◽  
Depth Measurement ◽  
Funded Project ◽  
One Machine ◽  
Republic Of Turkey

After successful implementation of two hardness standardizing machines at TSE (Turkish Standards Institution) in Rockwell and Brinell-Vickers hardness scales separately, it became unavoidable to combine them in one machine with a newer design and install it in Hardness Laboratory of UME (National Metrology Institute of Republic of Turkey) within the scope of an internally funded project. In this paper the new design of the Rockwell-Brinell- Vickers hardness standard machine with deadweight force application principle and a laser interferometer optic system as depth measurement unit for Rockwell Hardness scales designed by UME Hardness Laboratory is explained.

scholarly journals Compact wooden roofs with smart vapour barrier – Pilot project experiences

2020 ◽  
Vol 172 ◽  
pp. 07010
Author(s):  
Nora Schjøth Bunkholt ◽  
Lars Gullbrekken ◽  
Stig Geving ◽  
Tore Kvande
Keyword(s):  
Moisture Content ◽  
Organic Materials ◽  
Pilot Project ◽  
Arctic Climate ◽  
The Arctic ◽  
Pilot Projects ◽  
Preliminary Measurement ◽  
Safety Risks ◽  
Measurement Results ◽  
Initial Results

Compact roofs are normally built without organic materials between the vapour barrier and the roof membrane due to moisture safety risks. However, laboratory measurements indicate that organic materials could be used provided that a smart vapour barrier (SVB) is applied at the warm face of the roof construction. The aim of this study is to investigate the moisture and temperature conditions in three full-scale flat compact wooden roofs with SVB. The roofs are part of two pilot projects located in Longyearbyen, Svalbard and Malvik, Norway. The paper presents the two projects including the premises for construction of the roofs and provides preliminary measurement results. The roofs are instrumented to measure moisture content and temperature in the wooden roof beams. The initial results from Longyearbyen show that the moisture content in the wooden beams is low and indicate that compact wooden roofs with SVB may be a solution with acceptable moisture risk in the arctic climate. The initial results from Malvik show that there might be a risk of mould growth in the roof as the built-in moisture in the wooden beams was up to 24 weight-%. In both projects, the moisture content in the beams in general was higher close to the roof underlay than close to the SVB.

Development of a Novel Gear Measuring Device of High Accuracy

2003 ◽  
Author(s):  
Frank Ha¨rtig ◽  
Christian Keck ◽  
Karin Kniel ◽  
Heinrich Schwenke ◽  
Klaus Wendt ◽  
...  
Keyword(s):  
Manufacturing Industry ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
National Metrology Institute ◽  
Distance Information ◽  
Measuring Device ◽  
Measurement Results ◽  
Gear Manufacturing ◽  
Measuring Machine ◽  
Tracking Interferometer

The German national metrology institute, the Physikalisch-Technische Bundesanstalt (PTB), has developed a novel calibration method for gear artefacts. This reduces the current calibration uncertainty of gear standards, which is an essential step towards meeting the rising quality demands of the gear manufacturing industry. The measurement setup is based on a coordinate measuring machine (CMM) equipped with a high-precision rotary table. The key element of the novel gear measuring device is a tracking interferometer (TI) for reading the distance information. This information is combined with the reading of the coordinate measuring machine line scales in order to reduce the overall measurement uncertainty. If an optimized measurement strategy is applied, the measurement results are almost achieved with laser interferometer accuracy. First simulations and measurement results for an involute profile artefact are presented and discussed.

Hardness Test and Error Analysis of N80 Oil Casing

2013 ◽  
Vol 779-780 ◽  
pp. 161-164
Author(s):  
Ding Feng ◽  
Zhi Min Li ◽  
Hong Zhang ◽  
Lei Shi ◽  
Wei Ma ◽  
...  
Keyword(s):  
Error Analysis ◽  
Hardness Test ◽  
Pressure Head ◽  
Test Sample ◽  
Rockwell Hardness ◽  
Load Pressure ◽  
Hardness Tester ◽  
Measurement Results ◽  
Causes Of Errors ◽  
Petroleum Drilling

N80 oil casing is important equipment in petroleum drilling, to analyze the mechanical features of the N80 casing; we used Rockwell apparatus to test the hardness of N80 casing. And we have analyzed and eliminated the errors which may affect the result of the hardness test to ensure the reliability. At the same time, it summed up the causes of errors and the methods to avoid and reduce the errors during the Rockwell hardness test, and analyzed the hardness tester load, pressure head, the structure as well as the test sample roughness, shape and other factors which influenced the measurement results. Keywords: n80 oil casing; hardness test; error analysis

Development of Comprehensive Modal Emissions Model: Operating Under Hot-Stabilized Conditions

1997 ◽  
Vol 1587 (1) ◽  
pp. 52-62 ◽  
Author(s):  
Feng An ◽  
Matthew Barth ◽  
Joseph Norbeck ◽  
Marc Ross
Keyword(s):  
General Structure ◽  
Operating Conditions ◽  
Emission Model ◽  
Model Concept ◽  
Lean Burn ◽  
Preliminary Results ◽  
Measurement Results ◽  
Vehicle Technology ◽  
Good Agreement ◽  
Engine Power

A comprehensive modal emission model for light-duty cars and trucks is being developed. More than 300 real-world vehicles are being recruited for in-house dynamometer testing under as-is conditions to provide the foundation for the model. The model is designed to predict second-by-second tailpipe emissions under a variety of driving conditions. The vehicles can be modeled as individual vehicles with properly functioning, deteriorated, or malfunctioning emission control conditions, or as composite vehicles representing different vehicle technology categories. The model is based on a simple parameterized physical approach and consists of six modules that predict engine power, engine speed, air/fuel ratio, fuel use, engine-out emissions, and catalyst pass fraction. When developing the model, four important vehicle operating conditions are considered: cold and warm starts; normal, stoichiometric operation; high-power enrichment; and lean-burn operation. The model concept and the expected input/output requirements of the model are discussed. The general structure of the model also is presented, focusing on emissions for vehicles operating under hot-stabilized conditions. Preliminary results of the model are given, and comparisons are made between the modeled and measurement results for 17 sample vehicles. Preliminary results show good agreement.

scholarly journals Context-Based Dynamic Meshed Backhaul Construction for 5G Heterogeneous Networks

2018 ◽  
Author(s):  
Gia Khanh Tran ◽  
Ricardo Santos ◽  
Hiroaki Ogawa ◽  
Makoto Nakamura ◽  
Kei Sakaguchi ◽  
...  
Keyword(s):  
Base Stations ◽  
Preliminary Measurement ◽  
Efficient Operation ◽  
Traffic Distribution ◽  
Measurement Results ◽  
Novel Method ◽  
Reduce Energy Consumption ◽  
Cost Efficient ◽  
Cell Base ◽  
Dynamic Formation

5G heterogeneous network overlaid by millimeter-wave (mmWave) access employs mmWave meshed backhauling as a promising cost-efficient backhaul architecture. Due to the nature of mobile traffic distribution in practice which is both time-variant and spatially non-uniform, dynamic construction of mmWave meshed backhaul is prerequisite to support the varying traffic distribution. Focusing on such scenario of outdoor dynamic crowd (ODC), this paper proposes a novel method to control mmWave meshed backhaul for efficient operation of mmWave overlay 5G HetNet through Software-Defined Network (SDN) technology. Our algorithm is featured by two functionalities, i.e., backhauling route multiplexing for overloaded mmWave small cell base stations (SC-BSs) and mmWave SC-BSs’ ON/OFF status switching for underloaded spot. In this paper, the effectiveness of the proposed meshed network is confirmed by both numerical analyses and experimental results. Simulations are conducted over a practical user distribution modeled from measured data in realistic environments. Numerical results show that the proposed algorithm can cope with the locally intensive traffic and reduce energy consumption. Furthermore, a WiGig (Wireless Gigabit Alliance certified) device based testbed is developed for Proof-of-Concept (PoC) and preliminary measurement results confirm the proposed dynamic formation of the meshed network’s efficiency.

scholarly journals Certification of sodium benzoate solution reference material by HPLC-UV, LC-MS/MS and UV-VIS-NIR spectrophotometry for food and drug analysi

2020 ◽  
Vol 14 (2) ◽  
pp. 88-105
Author(s):  
Adel. B. Shehata ◽  
Abdulrahman R. Alaskar ◽  
Mohammed A. Alrasheed ◽  
Abdullah S. Alosaimi ◽  
Fahd A. Alkharraa ◽  
...  
Keyword(s):  
Reference Material ◽  
Sodium Benzoate ◽  
Scientific Literature ◽  
National Metrology Institute ◽  
Long Term Stability ◽  
Combining Data ◽  
Measurement Results ◽  
Certified Value

Sodium benzoate is one of the most widely used food perseverates and has to be used in regulated amounts to avoid its harmful health effects. Reviewing the scientific literature for traceability of the analytical measurement results of sodium benzoate in various food and drug applications to the SI units, it has been found that no scientific details of certification of sodium benzoate CRMs used for the calibration of measuring equipment are published. For this reason, the national metrology institute of Saudi Arabia (SASO/NMCC) certifies a sodium benzoate solution reference material. In this work, sodium benzoate was synthesized, purified and a batch solution reference material was prepared as 1014.47 mg/kg then homogenized and bottled. Homogeneity and stability of the candidate RM were assessed and the results obtained showed that the material is sufficiently homogeneous and stable. Characterization of the reference material was carried out by HPLC-UV, LC-MS/MS and UV-VIS-NIR spectrophotometer as three independent methods. The certified value was derived by combining data from the three methods using the weighted mean approach and was found 1016.13 mg/kg. The certified uncertainty was calculated as weighted uncertainty and was found 10.47 mg/kg (1.03%). Sources of this uncertainty were identified from the characterization, uchar, homogeneity, uhom, and long-term stability, ults, as well as the bias allowance, B.

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