A Hybrid Method of Analysis for Shaped Dielectric Lenses Compared with Measurement Results

Fresnel Zone Plate lens (FZPL) antennas working in the V and W band are reported in this paper with half and quarter phase correction respectively. A low cost and straightforward technological process is used to manufacture the dielectric lenses using only one foam material where the dielectric constant is controlled. Simulation and measurement results are in good agreement that confirms the viability of such a process to fabricate inhomogeneous structures. Good loss efficiency of 73 and 55% are obtained at 60 and 85 GHz respectively with the two different FZPL designs.

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How do we sedate children undergoing CSF opening pressure measurement? Results of a Germany-wide survey

Neuropediatrics ◽

10.1055/s-0031-1274037 ◽

2011 ◽

Vol 42 (S 01) ◽

Author(s):

D Tibussek ◽

F Distelmaier ◽

S Kummer ◽

E Mayatepek

Keyword(s):

Pressure Measurement ◽

Opening Pressure ◽

Measurement Results

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State special primary acceleration measurement standard for gravimetry GET 190-2019

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-7-3-8 ◽

2020 ◽

pp. 3-8

Author(s):

L.F. Vitushkin ◽

F.F. Karpeshin ◽

E.P. Krivtsov ◽

P.P. Krolitsky ◽

V.V. Nalivaev ◽

...

Keyword(s):

High Precision ◽

Free Fall ◽

Measurement Range ◽

Measurement Standard ◽

Acceleration Measurement ◽

Measurement Systems ◽

Free Fall Acceleration ◽

Investigation Methods ◽

Measurement Results ◽

Upper Level

The State special primary acceleration measurement standard for gravimetry (GET 190-2019), its composition, principle of operation and basic metrological characteristics are presented. This standard is on the upper level of reference for free-fall acceleration measurements. Its accuracy and reliability were improved as a result of optimisation of the adjustment procedures for measurement systems and its integration within the upgraded systems, units and modern hardware components. A special attention was given to adjusting the corrections applied to measurement results with respect to procedural, physical and technical limitations. The used investigation methods made it possibled to confirm the measurement range of GET 190-2019 and to determine the contributions of main sources of errors and the total value of these errors. The measurement characteristics and GET 90-2019 were confirmed by the results obtained from measurements of the absolute value of the free fall acceleration at the gravimetrical site “Lomonosov-1” and by their collation with the data of different dates obtained from measurements by high-precision foreign and domestic gravimeters. Topicality of such measurements ensues from the requirements to handle the applied problems that need data on parameters of the Earth gravitational field, to be adequately faced. Geophysics and navigation are the main fields of application for high-precision measurements in this field.

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Development of reference materials with the composition of propyl and isopropyl alcohol solutions

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-6-66-72 ◽

2020 ◽

pp. 66-72

Author(s):

Irina A. Piterskikh ◽

Svetlana V. Vikhrova ◽

Nina G. Kovaleva ◽

Tatyana O. Barynskaya

Keyword(s):

Reference Materials ◽

Measurement Errors ◽

Isopropyl Alcohol ◽

Certified Reference Materials ◽

Toxic Substances ◽

Biological Objects ◽

Margin Of Error ◽

Measurement Results ◽

And Control ◽

Characteristic Mass

Certified reference materials (CRM) composed of propyl (11383-2019) and isopropyl (11384-2019) alcohols solutions were created for validation of measurement procedures and control of measurement errors of measurement results of mass concentrations of toxic substances (alcohol) in biological objects (urine, blood) and water. Two ways of establishing the value of the certified characteristic – mass consentration of propanol-1 or propanol-2 have been studied. The results obtained by the preparation procedure and comparison with the standard are the same within the margin of error.

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Problems of ensuring metrological traceability of measurement results of indicators of quality for food products and food raw materials

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-3-64-70 ◽

2020 ◽

pp. 64-70

Author(s):

Mariya Y. Medvedevskikh ◽

Anna S. Sergeeva

Keyword(s):

Reference Materials ◽

Mass Fraction ◽

Nutritional Value ◽

Animal Feed ◽

Raw Materials ◽

Meat Products ◽

Metrological Traceability ◽

Food Products ◽

Freeze Dried ◽

Measurement Results

The article raises the problem of ensuring metrological traceability of the measurement results of indicators of quality and nutritional value for food products and food raw materials: water (moisture), nitrogen (protein, crude protein), fat, ash and carbohydrates. The problem under consideration can be solved by applying reference materials of food composition, traceable to state primary measurement standards GET 173-2017 and GET 176-2019 and primary reference measurement procedures (PRMP), for attestation of measurement procedures and accuracy checking of measurement results. The article discusses the results of the PRMP development of mass fraction of fat, ash and carbohydrates in food products and food raw materials, as well as mass fraction of crude fat (oil content) in oil crops seeds and products based on them. The paper also presents metrological characteristics of reference materials of composition of dry dairy products, grain-milk dry porridges for nutrition of babies, grain dry porridges for nutrition of babies, egg powder, freeze-dried meat products, animal feed. The results of the work allow for building a chain of metrological traceability from GET 173-2017, GET 176-2019 and PRMP to routine measurement procedures, thereby ensuring the uniformity of measurements of nutritional value of food products.

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