Log in

Relevant bibliographies by topics / Metrological observer / Journal articles

To see the other types of publications on this topic, follow the link: Metrological observer.

Journal articles on the topic 'Metrological observer'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Metrological observer.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Iacomussi, Paola. "Metrology Impact of Advanced Driver Assistance Systems." Electronic Imaging 2020, no. 16 (2020): 202–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.16.avm-200.

Full text

Abstract:

Metrological applications to road environment are usually focused on the characterization of the road, considering as measurands several characteristics related to the road as a whole or the performances of single components, like the road surface, lighting systems, active and/or passive signaling and obviously vehicles equipment. In current standards approach, driving on the road means to navigate ”visually” (for a human being driver), the characterizations are mostly photometric performances oriented for given reference conditions and reference observer (photometric observer observing the ro

APA, Harvard, Vancouver, ISO, and other styles

2

Ayorinde, John O. O., Xavier Loizeau, Victoria Bardsley, et al. "Measurement Matters: A Metrological Approach to Renal Preimplantation Biopsy Evaluation to Address Uncertainty in Organ Selection." Transplantation Direct 10, no. 11 (2024): e1708. http://dx.doi.org/10.1097/txd.0000000000001708.

Full text

Abstract:

Background. Preimplantation biopsy combines measurements of injury into a composite index to inform organ acceptance. The uncertainty in these measurements remains poorly characterized, raising concerns variability may contribute to inappropriate clinical decisions. Methods. We adopted a metrological approach to evaluate biopsy score reliability. Variability was assessed by performing repeat biopsies (n = 293) on discarded allografts (n = 16) using 3 methods (core, punch, and wedge). Uncertainty was quantified using a bootstrapping analysis. Observer effects were controlled by semi-blinded sco

APA, Harvard, Vancouver, ISO, and other styles

3

Markulik, Štefan, Jozef Petrík, Marek Šolc, Peter Blaško, Pavol Palfy, and Lenka Girmanová. "The Relationship between Process Capability and Quality of Measurement System." Applied Sciences 12, no. 12 (2022): 5825. http://dx.doi.org/10.3390/app12125825.

Full text

Abstract:

This article deals with the design of appropriate measures that had to be taken for the implemented measurement system. The measurement result was significantly negatively affected by several factors. Forty-five samples of shafts used in the production of surgical drills were measured. Measurements were performed by metrological appraisers with a calibrated digital micrometer. Measurement and subsequent data processing revealed low process capability (CP and PP indices). A large portion of the shafts had an observed size below the lower specific limit (LSL). Therefore, it was necessary to take

APA, Harvard, Vancouver, ISO, and other styles

4

Glebov, A. B., I. V. Chizhik, N. M. Parkhomenko, and O. V. Dengub. "Features of the Functioning of the National Metrological System in the Health Sector." Metrology and instruments, no. 1 (March 2, 2020): 59–65. http://dx.doi.org/10.33955/2307-2180(1)2020.59-65.

Full text

Abstract:

The legislative requirements for metrological support in the healthcare sector, the issues of ensuring metrological traceability and the hierarchical scheme of calibrations and measurements in laboratory medicine according to the recommendations of JCTLM and their adaptation at the national level are considered. The features of the provided metrological control of measuring instruments for medical purposes, including when conducting their compliance assessment with the requirements of technical regulations. The current state of affairs in the confirmation of the technical competence of medical

APA, Harvard, Vancouver, ISO, and other styles

5

Seitz, S., R. Feistel, D. G. Wright, S. Weinreben, P. Spitzer, and P. De Bièvre. "Metrological traceability of oceanographic salinity measurement results." Ocean Science 7, no. 1 (2011): 45–62. http://dx.doi.org/10.5194/os-7-45-2011.

Full text

Abstract:

Abstract. Consistency of observed oceanographic salinity data is discussed with respect to contemporary metrological concepts. The claimed small uncertainty of salinity measurement results traceable to the conductivity ratio of a certified IAPSO Standard Seawater reference is not metrologically justified if results are compared on climatic time scales. This applies in particular to Practical Salinity SP, Reference Salinity SR, and the latest estimates of Absolute Salinity using the TEOS-10 formalism. On climate time scales an additional contribution to the uncertainty that is related to unknow

APA, Harvard, Vancouver, ISO, and other styles

6

Seitz, S., R. Feistel, D. G. Wright, S. Weinreben, P. Spitzer, and P. De Bièvre. "Metrological traceability of oceanographic salinity measurement results." Ocean Science Discussions 7, no. 4 (2010): 1303–46. http://dx.doi.org/10.5194/osd-7-1303-2010.

Full text

Abstract:

Abstract. Consistency of observed oceanographic salinity data is discussed with respect to contemporary metrological concepts. The claimed small uncertainty of salinity measurement results traceable to the conductivity ratio of a certified IAPSO Standard Seawater reference is not metrologically justified if results are compared on climatic time scales. This applies in particular to Practical Salinity SP, Reference Salinity SR, and the latest estimates of Absolute Salinity using the TEOS-10 formalism. In climate time scales an additional contribution to the uncertainty that is related to unknow

APA, Harvard, Vancouver, ISO, and other styles

7

Tesfaye, Solomon, Yeshambel Belyhun, Takele Teklu, Girmay Medhin, and al. et. "Malaria pattern observed in the highland fringe of Butajira, Southern Ethiopia: a ten-year retrospective analysis from parasitological and metrological data." MalariaWorld Journal 3, no. 5 (2012): 1–8. https://doi.org/10.5281/zenodo.10977912.

Full text

Abstract:

<strong>Background.</strong> Studying the magnitude of highland malaria is necessary to implement effective control measures in highland fringes of Ethiopia. Since repeated epidemics were reported in Butajira, this study hypothesized autochthonous transmission in the highland fringes of Butajira. Thus we aimed to determine the malaria occurrence and its association with meteorological variables in the highland fringe of Butajira, Southern Ethiopia from parasitological and metrological data. <strong>Methods.</strong> Retrospective monthly malaria case data was collected from

APA, Harvard, Vancouver, ISO, and other styles

8

S. Rajput. "MONITORING OF CODLING MOTH CYDIA POMONELLA (L.) THROUGH PHEROMONE TRAPS IN APPLE ORCHARD." Pakistan Journal of Science 75, no. 03 (2023): 551–53. http://dx.doi.org/10.57041/pjs.v75i03.1003.

Full text

Abstract:

A trial was conducted using RCBD design at Barkhan (Baghao) province Balochistan. Pheromone traps (04) were placed among the apple trees for the collection of the adult codling moth. These traps were hung on four randomly selected Apple tree at height of 2.5 meters with adjacent of five trees. The result indicated that the first flight of C. pomonella population (7.20±0.40 moths per trap) was observed in 17th standard metrological week. Afterwards, the C. pomonella population increases gradually 8.50±1.10 moths per trap in the 21ststandard metrological week. The maximum C. pomonella population

APA, Harvard, Vancouver, ISO, and other styles

9

Smith, Jessica, Mira Naftaly, Simon Nellen, and Björn Globisch. "Beam Profile Characterisation of an Optoelectronic Silicon Lens-Integrated PIN-PD Emitter between 100 GHz and 1 THz." Applied Sciences 11, no. 2 (2021): 465. http://dx.doi.org/10.3390/app11020465.

Full text

Abstract:

Knowledge of the beam profiles of terahertz emitters is required for the design of terahertz instruments and applications, and in particular for designing terahertz communications links. We report measurements of beam profiles of an optoelectronic silicon lens-integrated PIN-PD emitter at frequencies between 100 GHz and 1 THz and observe significant deviations from a Gaussian beam profile. The beam profiles were found to differ between the H-plane and the E-plane, and to vary strongly with the emitted frequency. Skewed profiles and irregular side-lobes were observed. Metrological aspects of be

APA, Harvard, Vancouver, ISO, and other styles

10

Jessica, Smith, Naftaly Mira, Nellen Simon, and Globisch Björn. "Beam Profile Characterisation of an Optoelectronic Silicon Lens-Integrated PIN-PD Emitter between 100 GHz and 1 THz." Applied Sciences 11, no. 2 (2021): 465. https://doi.org/10.3390/app11020465.

Full text

Abstract:

Knowledge of the beam profiles of terahertz emitters is required for the design of terahertz instruments and applications, and in particular for designing terahertz communications links. We report measurements of beam profiles of an optoelectronic silicon lens-integrated PIN-PD emitter at frequencies between 100 GHz and 1 THz and observe significant deviations from a Gaussian beam profile. The beam profiles were found to differ between the H-plane and the E-plane, and to vary strongly with the emitted frequency. Skewed profiles and irregular side-lobes were observed. Metrological aspects of be

APA, Harvard, Vancouver, ISO, and other styles

11

Mwakyoma, Julius, and Jailos Nzumile. "METROLOGICAL CONTROL OF TYRE PRESSURE GAUGES: A CASE STUDY OF KINONDONI MUNICIPAL COUNCIL, TANZANIA." Business Education Journal 10, no. 1 (2021): 1–11. http://dx.doi.org/10.54156/cbe.bej.10.1.239.

Full text

Abstract:

Monitoring the inflation of tyre pressure plays a significant role in ensuring safety of motor vehicle users both private and public. Accurate measurement of tyre inflation pressure requires a tyre pressure gauge, which is consistent and that complies with other metrological characteristics. Proper metrological control of the manufactured and imported gauges is paramount to measure the accuracy of the tyre pressure. The control of conformity to metrological characteristics for new and those in use is still uncertain, their accuracy is also not known to both users and their customers who inflat

APA, Harvard, Vancouver, ISO, and other styles

12

Morozov, Sergey Mikhaylovich, Konstantin Anatolyevich Kuzmin, Lyudmila Ivanovna Kochetkova, and Elena Vitalyevna Balmashnova. "Development of the initial concepts of metrological support of measuring and calculated operations in automating measurements." Agrarian Scientific Journal, no. 4 (April 29, 2019): 87–89. http://dx.doi.org/10.28983/asj.y2019i4pp87-89.

Full text

Abstract:

The article discusses the metrological support of the automated control system and the task of increasing the reliability of the measured parameters by increasing the measurement accuracy in the need to determine the conditions under which the correctness of the applicability of probabilistic-statistical methods to the estimates of measurement error is observed and the reliability of the control reliability indicators is met.

APA, Harvard, Vancouver, ISO, and other styles

13

F. Hasan, Ihsan. "TREND DETECTION OF METROLOGICAL DROUGHT IN NORTH OF IRAQ." Journal of Engineering and Sustainable Development 25, no. 3 (2021): 60–73. http://dx.doi.org/10.31272/jeasd.25.3.7.

Full text

Abstract:

This study presents an analysis of meteorological drought using multi time-scales of Standardized Precipitation Index SPI (6, 9 and 12 month), based on observed 49-year daily mean precipitation data records at 11 stations over the Northern region of Iraq. The detection of drought trends in results of SPI analysis was studied to identify whether there is any increase or decrease in the severity of drought at the selected meteorological Stations; Mann Kendall test and Sen's slope estimator were used to detect statistically significant trends. The results indicate that there is a statistically si

APA, Harvard, Vancouver, ISO, and other styles

14

Miller, W. Greg, Jeffrey Budd, Neil Greenberg, et al. "IFCC Working Group Recommendations for Correction of Bias Caused by Noncommutability of a Certified Reference Material Used in the Calibration Hierarchy of an End-User Measurement Procedure." Clinical Chemistry 66, no. 6 (2020): 769–78. http://dx.doi.org/10.1093/clinchem/hvaa048.

Full text

Abstract:

Abstract Establishing metrological traceability to an assigned value of a matrix-based certified reference material (CRM) that has been validated to be commutable among available end-user measurement procedures (MPs) is central to producing equivalent results for the measurand in clinical samples (CSs) irrespective of the clinical laboratory MPs used. When a CRM is not commutable with CSs, the bias due to noncommutability will be propagated to the CS results causing incorrect metrological traceability to the CRM and nonequivalent CS results among different MPs. In a commutability assessment, a

APA, Harvard, Vancouver, ISO, and other styles

15

Gulyaev, Petr S., Alexander N. Teplykh та Andrey Y. Dyachenko. "Исследование градуировочной характеристики турбинных преобразователей расхода жидкости типа MVTM". SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION, № 5 (9 грудня 2021): 576–81. http://dx.doi.org/10.28999/2541-9595-2021-11-5-576-581.

Full text

Abstract:

Most of the failures of turbine flow converters (TFC) used in the Russian system of main oil pipelines and oil product pipelines are caused by abrupt changes in the viscosity of the transported medium. In studies related to determination of the influence of the rheological properties of the pumped oil on the metrological characteristics of TFC that have a calibration curve in the form of a piecewise approximation without taking into account the correlation of TFC rotor speed with the viscosity of the pumped liquid in the flow rate subrange, the instability of the metrological characteristics i

APA, Harvard, Vancouver, ISO, and other styles

16

Hamaamin, Yaseen Ahmed. "Evaluation of Data Mining and Artificial Intelligence Methods to Predict Daily Precipitation." Journal of Engineering 31, no. 5 (2025): 99–112. https://doi.org/10.31026/j.eng.2025.05.06.

Full text

Abstract:

Precipitation is the most important weather parameter, which has direct and indirect effects on life on our planet. One of the most relevant climate change consequences is extreme weather conditions, such as floods and droughts. Up to now, climate model projections have remained uncertain, therefore, more accurate precipitation modelling techniques are necessary. Due to the complexity of relationships among metrological parameters, traditional statistical modelling tools are ineffective in forecasting and predicting weather conditions. In this study, data mining techniques were applied to metr

APA, Harvard, Vancouver, ISO, and other styles

17

Васьковская, М. И., В. В. Васильев, С. А. Зибров, В. П. Яковлев та В. Л. Величанский. "Спектрально-модуляционные характеристики лазеров с вертикальным резонатором". Письма в журнал технической физики 44, № 1 (2018): 51. http://dx.doi.org/10.21883/pjtf.2018.01.45430.17019.

Full text

Abstract:

AbstractThe requirements imposed on vertical-cavity surface-emitting lasers in a number of metrological problems in which optical pumping of alkali atoms is used are considered. For lasers produced by different manufacturers, these requirements are compared with the experimentally observed spectral characteristics at a constant pump current and in the microwave modulation mode. It is shown that a comparatively small number of lasers in the microwave modulation mode make it possible to obtain the spectrum required for atomic clocks based on the coherent population-trapping effect.

APA, Harvard, Vancouver, ISO, and other styles

18

Wasilewski, Tomasz, Damian Neubauer, Marek Wojciechowski, Bartosz Szulczyński, Jacek Gębicki, and Wojciech Kamysz. "Evaluation of Linkers’ Influence on Peptide-Based Piezoelectric Biosensors’ Sensitivity to Aldehydes in the Gas Phase." International Journal of Molecular Sciences 24, no. 13 (2023): 10610. http://dx.doi.org/10.3390/ijms241310610.

Full text

Abstract:

Recent findings qualified aldehydes as potential biomarkers for disease diagnosis. One of the possibilities is to use electrochemical biosensors in point-of-care (PoC), but these need further development to overcome some limitations. Currently, the primary goal is to enhance their metrological parameters in terms of sensitivity and selectivity. Previous findings indicate that peptide OBPP4 (KLLFDSLTDLKKKMSEC-NH2) is a promising candidate for further development of aldehyde-sensitive biosensors. To increase the affinity of a receptor layer to long-chain aldehydes, a structure stabilization of t

APA, Harvard, Vancouver, ISO, and other styles

19

Medeiros Moreira, Rosana, and Elcio Cruz de Oliveira. "Metrological evaluation of efficiency and consumption of domestic gas cooking appliances." International Journal of Metrology and Quality Engineering 12 (2021): 16. http://dx.doi.org/10.1051/ijmqe/2021015.

Full text

Abstract:

This study evaluates the results of efficiency and consumption tests on gas household appliances and their influence on the classification of the Brazilian Labeling Program. Historically, based on results in interlaboratory comparisons, there is a doubt concerning if the algorithms correct properly the differences among different altitudes. Data from efficiency and consumption tests were collected in two cities with different altitudes, and the proposed calculation methodology is compared with the traditional one. The results show that the arithmetic average, used in the calculation of the eff

APA, Harvard, Vancouver, ISO, and other styles

20

Asghari, Mehdi, Gholam Abbas Fallah Ghalhari, and Hamidreza Heidari. "Investigation of Thermal Comfort Changes Using Summer Simmer Index (SSI): A Case Study in Different Climates of Iran." Open Environmental Research Journal 14, no. 1 (2021): 13–23. http://dx.doi.org/10.2174/2590277602114010013.

Full text

Abstract:

Objective: This study aimed to assess the thermal comfort trend using a metrological parameter based on the Summer Simmer Index (SSI), for different climates of Iran between 1985 and 2014. Methods: This is a Time-series study. The new SSI was calculated using metrological data in a 30 year- period for illustrating the changes to the thermal comfort or discomfort level through summer months in different climates of Iran. Mann- Kendall test and Sen's Slope were used to compare the upward or downward trend of the index during this period. Results: The worst thermal condition was observed in the s

APA, Harvard, Vancouver, ISO, and other styles

21

Garcia Izquierdo, Carmen, Graziano Coppa, Sonia Hernández, and Andrea Merlone. "Metrological Evaluation of the Building Influence on Air Temperature Measurements." Atmosphere 15, no. 2 (2024): 209. http://dx.doi.org/10.3390/atmos15020209.

Full text

Abstract:

This paper describes the metrological procedure carried out for the evaluation of the building influence on air temperature measurements. This evaluation aims to produce reliable conclusions, information, and data to contribute to the WMO siting classification schemes for air temperature measurements. For this purpose, a field experiment was designed, deployed, and carried out. As a result, one-year-lasting air temperature measurements were collected and analyzed. In this field experiment, a 200 m wide building is the unique artificial heat source and the unique object projecting shades over a

APA, Harvard, Vancouver, ISO, and other styles

22

Bhati, Dinesh Singh, Swatantra Kumar Dubey, and Devesh Sharma. "Application of Satellite-Based and Observed Precipitation Datasets for Hydrological Simulation in the Upper Mahi River Basin of Rajasthan, India." Sustainability 13, no. 14 (2021): 7560. http://dx.doi.org/10.3390/su13147560.

Full text

Abstract:

Hydrological modeling is an important tool used for basin management and studying the impacts of extreme events in a river basin. In streamflow simulations, precipitation plays an essential role in hydrological models. Meteorological satellite precipitation measurement techniques provide highly accurate rainfall information with high spatial and temporal resolution. In this analysis, the tropical rainfall monitoring mission (TRMM) 3B42 V7 precipitation products were employed for simulating streamflow by using the soil water assessment tool (SWAT) model. With India Metrological Department and T

APA, Harvard, Vancouver, ISO, and other styles

23

Bogucki, Mateusz. "O fragmentaryzacji srebra wczesnośredniowiecznego: na ile wiarygodne są dane metrologiczne? Przypadek skarbu z Mózgowa na Warmii (t.p.q. 1009)." Slavia Antiqua. Rocznik poświęcony starożytnościom słowiańskim, no. 60 (January 1, 2020): 221–38. http://dx.doi.org/10.14746/sa.2019.60.8.

Full text

Abstract:

For years, a discussion has been held about the circulation of silver in the early Middle Ages and the role played by fragments of coins and ornaments. This multi-faceted discussion has also revolved around the function of the smallest fragments. Metrological research has indicated certain regularities in the incidence of fragments of a specified weight depending on region and chronology. New data for this discussion was provided by a treasure trove originally discovered in 1868 in Mózgowo in Warmia. Only slightly more than 400 coins have survived from the items discovered in the 19th century;

APA, Harvard, Vancouver, ISO, and other styles

24

Rosental, O. M., and G. A. Sambursky. "Determination of water quality from the standpoint of the trap of non-representativeness: errors that occur when combining data series." Journal of Physics: Conference Series 2373, no. 8 (2022): 082007. http://dx.doi.org/10.1088/1742-6596/2373/8/082007.

Full text

Abstract:

Abstract The errors caused by the non-representativeness of the sample data arrays when they are directly combined are analyzed. Using examples of water quality analysis and the quality of metrological support for production processes, it is shown that even if desirable changes in controlled dependencies are observed in different data groups, changes may still be undesirable when combining these groups. It is shown that the correct unification, preserving the direction of functional dependencies, provides for the introduction of weighting coefficients in such a way that the weighted proportion

APA, Harvard, Vancouver, ISO, and other styles

25

Doroschuk, V. O., T. V. Kyrychuk, and V. M. Levchyk. "Cloud Point Pre-Concentration Coupled With Ultrasound-Assisted Back Extraction Of Permethrin And Alfa-Cypermethrin For GC-FID Determination In Waters And Foods." Methods and Objects of Chemical Analysis, no. 4 (2018): 160–66. http://dx.doi.org/10.17721/moca.2018.160-166.

Full text

Abstract:

A new method of cloud point extraction coupled with ultrasound-assisted back extraction that is followed by GC-FID determination of permethrin and α-cypermethrin in waters, vegetables, and fruits was developed. The effect of several parameters on the extraction process, such as the concentration of Triton X-114, pH, incubation time, equilibration temperature and centrifuging parameters were studied and optimized. The complete extraction of pesticides with using 0.5 % solution of Triton X-114 at phase separation temperature of 40 °C is observed in the pH range from 2.0 to 9.0 when both analytes

APA, Harvard, Vancouver, ISO, and other styles

26

Minkina, Waldemar. "Problems of Remote Temperature Measurement of Small Objects of Electricity Power Systems—On the Example of Lashing Clamps of Bridge Connections on High Voltage Poles." Energies 14, no. 16 (2021): 5041. http://dx.doi.org/10.3390/en14165041.

Full text

Abstract:

The article presents problems occurring during remote temperature measurement of lashing clamps of bridge connections on high voltage poles using thermal imaging cameras. The basic metrological parameters of thermal imaging cameras are described. On this basis, typical errors made during the inspection of high voltage lines supplying power substations are presented using infrared cameras. Researching the possible solutions for the problems of remote temperature measurement of small objects of electricity power systems—on the example of lashing clamps of bridge connections on high voltage poles

APA, Harvard, Vancouver, ISO, and other styles

27

Andrei, A. H., E. Reis Neto, J. L. Penna, et al. "Measurements of the Apparent Solar Diameter with Astrolabe at Observatório Nacional—1997/2000." Symposium - International Astronomical Union 203 (2001): 86–89. http://dx.doi.org/10.1017/s0074180900218822.

Full text

Abstract:

The metrological qualities render the modified CCD solar astrolabe a very reliable instrument for the difficult conditions of solar diameter measurements. At O.N. an average value of 959”.04 ± 0”.01 is found, for λ = 563.5nm, and an effective bandpass of 168nm. To improve the signal to noise ratio, the images are treated for flat field. This includes distortions brought about by the COHU 4710 camera, the astrolabe optics, and by the system of filters that cut down the incoming solar light. The extensive series observed (over 12000 independent measures) is examined, using a CLEAN periodogram al

APA, Harvard, Vancouver, ISO, and other styles

28

Kornilov, V. M., D. D. Karamov, F. F. Sitdikov, and R. R. Khayretdinov. "ATOMIC FORCE MICROSCOPY OF POLYMER NANOPARTICLES." Izvestia Ufimskogo Nauchnogo Tsentra RAN, no. 1 (March 28, 2022): 10–14. http://dx.doi.org/10.31040/2222-8349-2022-0-1-10-14.

Full text

Abstract:

The paper presents the results of an experimental study of polymer nanoparticles on different substrates by atomic force microscopy. The main metrological parameters of polymer nanoparticles are determined, the results are compared with the available data on the supramolecular structure of solid films. It is established that the size and shape of the observed structures, other things being equal, significantly depend on the type of substrate. It is shown that aggregation and self-organization of polymer nanoparticles occurs during the preparation of samples on silicon. The work was carried out

APA, Harvard, Vancouver, ISO, and other styles

29

Stolyarevskaya, Raisa I. "Applied Photometry: Review of Retrospective and Reality Part 2: LED Challenge to Photometry." Light & Engineering, no. 04-2023 (August 2023): 65–77. http://dx.doi.org/10.33383/2022-125.

Full text

Abstract:

This is the second part devoted to review of modern applied photometry. In the six paragraphs of part 1 of this publication1, the oneness of candela and Watt realization and short history of artificial light sources up to LED intervention was observed. Activity of international expert’s community in field of light and optical radiation measurements was discussed. The replacement of traditional sources of general lighting and signalling by radiation sources with LEDs, which have a spectral distribution of light emitting characteristics different from traditional light sources, has raised a numb

APA, Harvard, Vancouver, ISO, and other styles

30

Stiros, Stathis C. "GNSS (GPS) Monitoring of Dynamic Deflections of Bridges: Structural Constraints and Metrological Limitations." Infrastructures 6, no. 2 (2021): 23. http://dx.doi.org/10.3390/infrastructures6020023.

Full text

Abstract:

The advent of modern geodetic satellite techniques (GNSS, including GPS) permitted to observe dynamic deflections of bridges, initially of long flexible ones, and more recently of short, essentially stiff bridges with modal frequencies > 1 Hz, and with small SNR (signal-to-noise ratio), even SNR < 1. This was an enormous progress, but not without problems. Apart from monitoring results consistent with structural models, experimental data and serviceability criteria, there exist some apparently unexplained cases of stiff bridges for which there have been claimed apparent dynamic deflectio

APA, Harvard, Vancouver, ISO, and other styles

31

Rashid, Haveen Muhammed. "Drought Assessment based on Different Metrological Drought indices in Sulaymaniyah Governorate, KRG, Iraq." Journal of Engineering 30, no. 9 (2024): 190–215. http://dx.doi.org/10.31026/j.eng.2024.09.10.

Full text

Abstract:

Drought is a dangerous situation that lowers individual standards of living. It is considered a devastating natural event. This study intends to thoroughly examine the occurrence and characteristics of drought events in the Sulaymaniyah Governorate from 1985 to 2015. The study employed three standardized indices: the standardized precipitation evapotranspiration index (SPEI), the standardized precipitation index (SPI), and the Reconnaissance Drought Index (RDI). These indices were utilized at different periods, namely 3, 6, 9, and 12 months. According to findings, the maximum percent of extrem

APA, Harvard, Vancouver, ISO, and other styles

32

Pinzón, Gustavo, Edward Andò, Alessandro Tengattini, Gioacchino Viggiani, and Jacques Desrues. "Contact evolution in granular materials with inherently anisotropic fabric." EPJ Web of Conferences 249 (2021): 06015. http://dx.doi.org/10.1051/epjconf/202124906015.

Full text

Abstract:

This paper presents the results of two triaxial compression tests performed on approximately 9×103 oblate spheroids (lentils) with different initial orientations with respect to the loading axis (approximately 30° and 60°). Typical stress-strain information is complemented with x-ray tomography scans every 1 % strain. Starting from an initial labelling of particles, a new technique is used to obtain unprecedented detail of tracking of all the particles through time. This rich dataset is analysed from the perspective of inter-particle contacts (building on previous metrological work on this sub

APA, Harvard, Vancouver, ISO, and other styles

33

Fritsch, Noémie, France Floc'h, and Guillaume Fromant. "ON A METHODOLOGY TO MEASURE WAVE BOUDARY LAYER PARAMETERS UNDER IN SITU SURFACE WAVES." Coastal Engineering Proceedings, no. 38 (May 29, 2025): 20. https://doi.org/10.9753/icce.v38.sediment.20.

Full text

Abstract:

Sand transport predictions represent high social, economic and environmental stakes. Therefore, reliable sand transport models are needed. On a beach, either erosion or accretion can take place. Mechanisms leading to erosion are quite well known whereas accretion is less well predicted. Onshore transport occurs in the Wave Boundary Layer (WBL). Up until now, WBL transport processes have mainly been observed in laboratory conditions, in a controlled environment. This allowed in particular to highlight the three main WBL parameters (near-bed velocity phase shift, non-linearities evolution and WB

APA, Harvard, Vancouver, ISO, and other styles

34

Kudrevatykh, Alexandra Alexandrovna, Lyubov Stepanovna Klimenko, and Timofey Petrovich Martyanov. "Desing of optical chemosensors for detection of cyanide ions in water environments." Yugra State University Bulletin 15, no. 1 (2019): 82–87. http://dx.doi.org/10.17816/byusu20190182-87.

Full text

Abstract:

Molecular interactions with various anions in the form of tetrabutylammonium salts in DMSO and DMSO-aqueous mixture were studied spectrophotometrically. It turned out that the solutions of 1-hydroxy-2-acylaminoanthraquinones in DMSO, originally yellow, became dark purple with the addition of cyanide, fluoride, phosphate, and acetate ions. The addition of other salts did not cause changes in the absorption spectra. When switching to aqueous DMSO, a contrasting color change in the solution was observed only with the addition of the cyanide ion. The stability constants of the complexes and the me

APA, Harvard, Vancouver, ISO, and other styles

35

Martins, L. L., J. P. Gomes, and A. S. Ribeiro. "Metrological quality of the excitation force in forced vibration test of concrete dams." Journal of Physics: Conference Series 2647, no. 21 (2024): 212001. http://dx.doi.org/10.1088/1742-6596/2647/21/212001.

Full text

Abstract:

Abstract This paper describes the study of the metrological quality of the excitation force in the context of force vibration test of concrete dams. For this purpose, a measurement uncertainty evaluation was performed, based on available probabilistic information about the input quantities – rotation frequency, mass, radial position, dimension, diameter and density of the generator’s rod – which support the determination of the excitation force in an eccentric masses vibration generator, used by LNEC in concrete dam’s field observation. The uncertainty propagation from the input quantities to

APA, Harvard, Vancouver, ISO, and other styles

36

Kuldeep, Kuldeep, Sohil Sisodiya, and Anil K. Mathur. "Variation in NO₂ Concentrations for Kota City (India) Associated with COVID-19." ECS Transactions 107, no. 1 (2022): 3081–89. http://dx.doi.org/10.1149/10701.3081ecst.

Full text

Abstract:

This study focuses on how the covid-19 pandemic impacts NO2 concentration in Kota City, Rajasthan (India), under different metrological conditions (Temperature, Precipitation, Relative Humidity, and Wind speed and direction). A reduction in NO2 concentration (-55%) was observed due to the Lockdown in Kota city. A sharp decrease of -37% in NO2 levels was observed in lockdown compared to the same period of 2019. However, a massive increase of 57% in NO2 levels was also seen in 2021 compared to the 2020 lockdown period. This study shows the lockdown effect on atmospheric composition, mainly throu

APA, Harvard, Vancouver, ISO, and other styles

37

Rigo-Bonnin, Raül, Pedro Alía, and Francesca Canalias. "Measurement uncertainty and metrological traceability of whole blood cyclosporin A mass concentration results obtained by UHPLC-MS/MS." Clinical Chemistry and Laboratory Medicine (CCLM) 56, no. 9 (2018): 1458–68. http://dx.doi.org/10.1515/cclm-2018-0120.

Full text

Abstract:

Abstract Background: Traceable and accurate results of cyclosporine A (CsA) mass concentrations in whole blood are required to ensure the monitoring of immunosuppressive therapy in transplant recipients. Metrological traceability and measurement uncertainty can allow ensuring reliability and comparability of these results over time and space. In this study, we provide a practical and detailed example of how the traceability and uncertainty of mass concentration of CsA results, obtained using an ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) procedure, can b

APA, Harvard, Vancouver, ISO, and other styles

38

de Albuquerque Neto, Felipe Roque, José Eduardo Ferreira de Oliveira, Rodrigo Gustavo Dourado da Silva, et al. "Statistical Analysis of Temperature Sensors Applied to a Biological Material Transport System: Challenges, Discrepancies, and a Proposed Monitoring Methodology." Processes 13, no. 6 (2025): 1904. https://doi.org/10.3390/pr13061904.

Full text

Abstract:

Conventional methods for transporting biological materials typically use dry ice or ice for preservation but often overlook important aspects of temperature monitoring and metrological control. These methods generally do not include temperature sensors to track the thermal conditions of the materials during transport, nor do they apply essential metrological practices such as regular sensor calibration and stability checks. This lack of precise monitoring poses significant risks to the integrity of temperature-sensitive biological materials. This study presents a statistical analysis of DS18B2

APA, Harvard, Vancouver, ISO, and other styles

39

Feissel, M. "Permanent Milliarcsecond Link of Celestial and Terrestrial Reference Systems." International Astronomical Union Colloquium 127 (1991): 101–7. http://dx.doi.org/10.1017/s0252921100063624.

Full text

Abstract:

AbstractThe celestial reference system and the terrestial reference system of the International Earth Rotation Service (IERS) are realized on the basis of observation programs in Very Long Baseline radio Interferometry and laser ranging to the Moon and artificial satellites. The celestial frame is materialized by the equatorial coordinates of radio sources observed in VLBI; the terrestrial frame is materialized by the cartesian coordinates of the terrestrial sites monitored by the three techniques. Series of the Earth Orientation Parameters are derived from the same observations. These series

APA, Harvard, Vancouver, ISO, and other styles

40

Milner, William R., Stefan Lannig, Mikhail Mamaev, et al. "Coherent evolution of superexchange interaction in seconds-long optical clock spectroscopy." Science 388, no. 6746 (2025): 503–8. https://doi.org/10.1126/science.ado5987.

Full text

Abstract:

Scaling up the performance of atomic clocks requires understanding complex many-body Hamiltonians to ensure meaningful gains for metrological applications. Here we use a degenerate Fermi gas loaded into a three-dimensional optical lattice to study the effect of a tunable Fermi-Hubbard Hamiltonian. The clock laser introduces a spin-orbit coupling spiral phase and breaks the isotropy of superexchange interactions, leading to XXZ-type spin anisotropy. By tuning the lattice confinement and applying imaging spectroscopy, we map out favorable atomic coherence regimes. We transition through various i

APA, Harvard, Vancouver, ISO, and other styles

41

Ferretti, Roberta, Massimo Caccia, Massimo Coltorti, and Roberta Ivaldi. "New Approaches for the Observation of Transient Phenomena in Critical Marine Environment." Journal of Marine Science and Engineering 9, no. 6 (2021): 578. http://dx.doi.org/10.3390/jmse9060578.

Full text

Abstract:

This paper focuses on the development of new approaches to observe transient phenomena in critical marine environments using autonomous marine vehicles (AMVs) for the acquisition of physical and biogeochemical parameters of water and seabed characterization. The connection with metrological principles, together with the adoption of observing methodologies adjustable according to the specific marine environment being studied, allows researchers to obtain results that are reliable, reproducible, and comparable with those obtained through the classic monitoring methodologies. Tests were executed

APA, Harvard, Vancouver, ISO, and other styles

42

Ahmad, Khalil, Abhishek Banerjee, Wajid Rashid, Zilong Xia, Shahid Karim, and Muhammad Asif. "Assessment of Long-Term Rainfall Variability and Trends Using Observed and Satellite Data in Central Punjab, Pakistan." Atmosphere 14, no. 1 (2022): 60. http://dx.doi.org/10.3390/atmos14010060.

Full text

Abstract:

This study explores the spatio-temporal distribution and trends on monthly, seasonal, and annual scales of rainfall in the central Punjab districts of Punjab province in Pakistan by using observation and satellite data products. The daily observed data was acquired from the Pakistan Metrological Department (PMD) between 1983 and 2020, along with one reanalysis, namely the Climate Hazard Infrared Group Precipitation Station (CHIRPS) and one satellite-based daily Precipitation Estimation from Remotely Sensed Information Using Artificial Neural Networks climate data record (PERSIANN-CDR) using th

APA, Harvard, Vancouver, ISO, and other styles

43

Hunt, Samuel E., Jonathan P. D. Mittaz, David Smith, et al. "Comparison of the Sentinel-3A and B SLSTR Tandem Phase Data Using Metrological Principles." Remote Sensing 12, no. 18 (2020): 2893. http://dx.doi.org/10.3390/rs12182893.

Full text

Abstract:

The Sentinel-3 mission is part of the Copernicus programme space segment and has the objective of making global operational observations of ocean, land and atmospheric parameters with its four on-board sensors. Two Sentinel-3 satellites are currently on orbit, providing near-daily global coverage. Sentinel-3A was launched on 16 February 2016 and Sentinel-3B on 25 April 2018. For the early part of its operation, Sentinel-3B flew in tandem with Sentinel-3A, flying 30 s ahead of its twin mission. This provided a unique opportunity to compare the instruments on the two satellites, and to test the

APA, Harvard, Vancouver, ISO, and other styles

44

Rustam Zinnatullivich, Khayrullin, Khaimuldinova Altyngul Kumashevna, Taimanova Gulnara Kabzhanovna, et al. "Application of bayesian scientific approach to constructing the statistical estimations for solving metrological and measurement problems." Nexo Revista Científica 34, no. 04 (2021): 1301–21. http://dx.doi.org/10.5377/nexo.v34i04.12666.

Full text

Abstract:

Nowadays, constructing effective statistical estimates with a limited amount of statistical information constitutes a significant practical problem. The article is devoted to applying the Bayesian scientific approach to the construction of statistical estimates of the parameters of the laws of distribution of random variables. Five distribution laws are considered: The Poisson law, the exponential law, the uniform law, the Pareto law, and the ordinary law. The concept of distribution laws that conjugate with the observed population was introduced and used. It is shown that for considered distr

APA, Harvard, Vancouver, ISO, and other styles

45

Khelifa, N. "Effect of Measurement of Dew Point Temperature in Moist Air on the Absorption Line at 1392.53 nm of Water Vapor." International Journal of Optics 2019 (April 2, 2019): 1–7. http://dx.doi.org/10.1155/2019/3424172.

Full text

Abstract:

The HITRAN database (High-Resolution Transmission molecular absorption database) is an extremely helpful reference for selecting lines of molecular species. In the case of water vapor, a particular strong absorption line around λ ≈ 1392.5 nm is suitable for the detection of molecules, not only because of its high strength but also because it is well separated from the neighboring transitions, thus avoiding any overlap. First, we present the optical system that uses a distributed feedback (DFB) laser diode, emitting around λ ≈ 1392.5 nm with a power ≈ 3 mW and linewidth ≤ 10 MHz. For metrologic

APA, Harvard, Vancouver, ISO, and other styles

46

Li, Zeyang, Simone Colombo, Chi Shu, et al. "Improving metrology with quantum scrambling." Science 380, no. 6652 (2023): 1381–84. http://dx.doi.org/10.1126/science.adg9500.

Full text

Abstract:

Quantum scrambling describes the spreading of information into many degrees of freedom in quantum systems, such that the information is no longer accessible locally but becomes distributed throughout the system. This idea can explain how quantum systems become classical and acquire a finite temperature, or how in black holes the information about the matter falling in is seemingly erased. We probe the exponential scrambling of a multiparticle system near a bistable point in phase space and utilize it for entanglement-enhanced metrology. A time-reversal protocol is used to observe a simultaneou

APA, Harvard, Vancouver, ISO, and other styles

47

Abdurakhmonov, Ergashboy, Zulfiya Muradova, and Salokhiddin Zikirov. "Development of triethylamine detecting semiconductor sensor and to study its metrological description in technical and ecological safety." E3S Web of Conferences 486 (2024): 04014. http://dx.doi.org/10.1051/e3sconf/202448604014.

Full text

Abstract:

In this study, a semiconductor sensor was developed to detect triethanolamine. The influence of various factors on the metrological parameters of the developed sensor is investigated. Studies have shown that when using semiconductor films based on SnO2 and Fe2O3, the optimal temperature providing the maximum signal of the gas-sensitive material (GSM) relative to trimethylamine is 375 °C. At this temperature, it was observed that the signal value corresponding to the same concentration of triethylamine increased with an increase in the amount of iron oxide in gassensitive materials. The tempera

APA, Harvard, Vancouver, ISO, and other styles

48

Gupta, Naveen, Renu Saigal, Laxmikant Goyal, Abhishek Agrawal, Rajat Bhargava, and Arun Agrawal. "Carotid Intima Media Thickness as a Marker of Atherosclerosis in Ankylosing Spondylitis." International Journal of Rheumatology 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/839135.

Full text

Abstract:

Aim. Increased cardiovascular morbidity and mortality have been observed in ankylosing spondylitis because of accelerated atherosclerosis. We measured carotid intima media thickness (CIMT) as a surrogate marker of atherosclerosis in this study.Methods. In this study 37 cases of AS and the same number of matched individuals were recruited. CIMT measurements were done using B-mode ultrasound. Disease activity was assessed using Bath ankylosing spondylitis disease activity index (BASDAI), Bath ankylosing spondylitis functional index (BASFI), and Bath ankylosing spondylitis metrological index (BAS

APA, Harvard, Vancouver, ISO, and other styles

49

ul-Haq, Zia, Salman Tariq, and Muhammad Ali. "Tropospheric NO2Trends over South Asia during the Last Decade (2004–2014) Using OMI Data." Advances in Meteorology 2015 (2015): 1–18. http://dx.doi.org/10.1155/2015/959284.

Full text

Abstract:

The focus of this study is to assess spatiotemporal variability of tropospheric NO2over South Asia using data from spaceborne OMI during the past decade (2004–2015). We find an average value of NO21.0 ± 0.05 × 1015 molec/cm2and a significant decadal increase of 14%. The elevating NO2pollution over the region is linked to rise in motor vehicles and industrial and agricultural activities and increase in biomass fuel usage. The observed seasonality of NO2is associated with change in meteorological conditions and seasonal cycles of anthropogenic emissions. OMI data reveal a seasonal peak in spring

APA, Harvard, Vancouver, ISO, and other styles

50

Sharma, Vanita, Anju Pratap, Sushma Makhaik, Kunal Chawla, Neeraj Kumar, and Ankur Gupta. "Variable origin of vertebral artery : A Cadaveric and Multidetector computed tomographic study on Indian population." National Journal of Clinical Anatomy 7, no. 04 (2018): 195–200. http://dx.doi.org/10.1055/s-0040-1701736.

Full text

Abstract:

Abstract Background: The knowledge of normal and variant anatomy of vertebral artery is important for the interpretation of vascular radiology and in performing safe vascular procedures like repair of aneurysms, excision of craniocervical junction masses & vertebral endarterectomy. Aim: To find out incidence of left vertebral artery of aortic origin in North Indian population. Materials & Method: During routine dissection of thoracic region, an anatomical variation of origin of left vertebral artery of aortic origin was observed in adult male cadaver. To find out incidence of left vert

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!