Metrologia最新文献_第2页

Update of the BIPM comparison BIPM.RI(II)-K1.Lu-177 of activity measurements of the radionuclide 177Lu to include the 2023 result of the CMI (Czechia) 更新 BIPM.RI(II)-K1.Lu-177 放射性核素 177Lu 放射性活度测量的 BIPM.RI(II)-K1.Lu-177 比对，以纳入 CMI 2023 年的结果（捷克

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-19 DOI: 10.1088/0026-1394/61/1a/06012

Romain Coulon, Carine Michotte, Sammy Courte, Manuel Nonis, Vincent Gressier, Jana Sochorová, Pavel Auerbach

{"title":"Update of the BIPM comparison BIPM.RI(II)-K1.Lu-177 of activity measurements of the radionuclide 177Lu to include the 2023 result of the CMI (Czechia)","authors":"Romain Coulon, Carine Michotte, Sammy Courte, Manuel Nonis, Vincent Gressier, Jana Sochorová, Pavel Auerbach","doi":"10.1088/0026-1394/61/1a/06012","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/06012","url":null,"abstract":"<title>Main text</title>Since 2000, 8 laboratories have submitted 8 samples of <sup>177</sup>Lu to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)- K1.Lu-177. Recently, the CMI (Czechia) participated in the comparison. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the CCRI(II)-K2.Lu-177 comparison have been calculated and the results are given in the form of a table. A graphical representation is also given.To reach the main text of this paper, click on <ext-link xlink:href=\"https://www.bipm.org/documents/d/guest/bipm-ri-ii-k1-lu-177_cmi_2023\" xlink:type=\"simple\">Final Report</ext-link>. Note that this text is that which appears in Appendix B of the BIPM key comparison database <ext-link xlink:href=\"https://www.bipm.org/kcdb/\" xlink:type=\"simple\">https://www.bipm.org/kcdb/</ext-link>.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomaly detection for atomic clocks using unsupervised machine learning algorithms 使用无监督机器学习算法进行原子钟异常检测

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-14 DOI: 10.1088/1681-7575/ad6b30

Edwin Chen, André Charbonneau, Marina Gertsvolf, Yunli Wang

{"title":"Anomaly detection for atomic clocks using unsupervised machine learning algorithms","authors":"Edwin Chen, André Charbonneau, Marina Gertsvolf, Yunli Wang","doi":"10.1088/1681-7575/ad6b30","DOIUrl":"https://doi.org/10.1088/1681-7575/ad6b30","url":null,"abstract":"Atomic clocks are the most accurate timekeeping instruments in the world and play a crucial role in numerous applications, notably in satellite navigation. Nonetheless, the accuracy of these clock signals is subject to anomalies, highlighting the importance of anomaly characterization and detection. In our study, we identify three types of anomalies in the phase data of atomic clocks—outliers, phase jumps and inflection points, and also frequency jumps in the frequency data, which corresponds to the inflection points. The novelty of our work lies in the application of machine learning methods for atomic clock anomaly detection (AD), as opposed to traditional algorithms. We introduce a variety of unsupervised AD and change point detection (CPD) algorithms from the realms of statistics and machine learning, propose a customized thresholding function for AD, and evaluate AD and CPD algorithms on both synthetic and real-world atomic clock data. Our experiments reveal that the subsequence local outlier factor algorithm achieves excellent performance in detecting outliers and phase jumps, but struggles with inflection points. Crucially, we found that the application of a CPD algorithm specifically for detecting the frequency jumps in frequency data substantially improves performance. Our study adopts unsupervised machine learning methods for AD provides robust detection strategies, thereby contributing an expanded understanding of the use of machine learning for clock data monitoring.","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AFRIMETS supplementary comparison on calibration of feeler gauges AFRIMETS 关于校准塞尺的补充比较

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-07 DOI: 10.1088/0026-1394/61/1a/04004

Ahmed ElMelegy, Lhossain Mechkour, Bede Obayi, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Zanele Nzimande and Patrick Masina

{"title":"AFRIMETS supplementary comparison on calibration of feeler gauges","authors":"Ahmed ElMelegy, Lhossain Mechkour, Bede Obayi, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Zanele Nzimande and Patrick Masina","doi":"10.1088/0026-1394/61/1a/04004","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04004","url":null,"abstract":"National Metrology Institutes from 8 African countries, namely Egypt, Morocco, Nigeria, Tanzania, Zambia, Zimbabwe, Botswana, and South Africa have participated in an international supplementary comparison on the calibration of feeler gauges. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AFRIMETS supplementary comparison on calibration of caliper AFRIMETS 关于校准卡尺的补充比较

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-07 DOI: 10.1088/0026-1394/61/1a/04009

Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina

{"title":"AFRIMETS supplementary comparison on calibration of caliper","authors":"Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina","doi":"10.1088/0026-1394/61/1a/04009","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04009","url":null,"abstract":"National Metrology Institutes from 12 African countries, namely Egypt, Morocco, Ghana, Nigeria, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, Mauritius and South Africa have participated in an international supplementary comparison on the calibration of caliper. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AFRIMETS supplementary comparison on calibration of dial gauge AFRIMETS 关于千分表校准的补充比较

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-07 DOI: 10.1088/0026-1394/61/1a/04007

Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina

{"title":"AFRIMETS supplementary comparison on calibration of dial gauge","authors":"Ahmed ElMelegy, Lhossain Mechkour, Paul Date, Bede Obayi, Tadesse Gergiso, Birhan Tesfaye, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam, Ramasawmy Pallut, Zanele Nzimande and Patrick Masina","doi":"10.1088/0026-1394/61/1a/04007","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04007","url":null,"abstract":"National Metrology Institutes from 11 African countries, namely Egypt, Morocco, Nigeria, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, Mauritius and South Africa have participated in an international supplementary comparison on the calibration of Dial Indicators. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Report on key comparison AFRIMETS.AUV.V-K5 and linking to CCAUV.V-K5 关于AFRIMETS.AUV.V-K5主要比较的报告以及与CCAUV.V-K5的链接

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-07 DOI: 10.1088/0026-1394/61/1a/09003

C S Veldman, Dr Naveen Garg, Mr Pairoj Rattanangkul and Lic Federico A Serrano

{"title":"Report on key comparison AFRIMETS.AUV.V-K5 and linking to CCAUV.V-K5","authors":"C S Veldman, Dr Naveen Garg, Mr Pairoj Rattanangkul and Lic Federico A Serrano","doi":"10.1088/0026-1394/61/1a/09003","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/09003","url":null,"abstract":"Following the completion of the fifth CIPM key comparison (KC) in the area of vibration concerning sinusoidal acceleration, participating Regional Metrology Organizations (RMOs) have the responsibility to disseminate the Key Comparison Reference Values (KCRV) to non-participating National Metrology Institutes (NMIs), thereby establishing a traceable link between NMIs participating in regional comparisons and the KCRVs. The comparison results reported here have that objective. The comparison was piloted by AFRIMETS with participants from three NMIs, situated in two RMOs, namely SIM and APMP. The respective Degrees of Equivalence, linked to the KCRVs, are reported. The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA). To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AFRIMETS supplementary comparison on calibration of setting rods AFRIMETS 关于校准定位杆的补充比较

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-07 DOI: 10.1088/0026-1394/61/1a/04005

Ahmed ElMelegy, Bede Obayi, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam and Ramasawmy Pallut

{"title":"AFRIMETS supplementary comparison on calibration of setting rods","authors":"Ahmed ElMelegy, Bede Obayi, Calvin Bore, Joseph James, Angela Charles, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam and Ramasawmy Pallut","doi":"10.1088/0026-1394/61/1a/04005","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04005","url":null,"abstract":"National Metrology Institutes from 8 African countries, namely Egypt, Nigeria, Kenya, Tanzania, Zambia, Zimbabwe, Botswana, and Mauritius have participated in an international supplementary comparison on the calibration of setting rods. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement was made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AFRIMETS supplementary comparison on pin gauges AFRIMETS 针规补充比较

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-08-07 DOI: 10.1088/0026-1394/61/1a/04006

Ahmed ElMelegy, Bede Obayi, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam and Ramasawmy Pallut

{"title":"AFRIMETS supplementary comparison on pin gauges","authors":"Ahmed ElMelegy, Bede Obayi, Daniel Mutale, Burnhard Gandah, Modiriemang Kame, Pamidzani Ntima, Tomeswar Pryam and Ramasawmy Pallut","doi":"10.1088/0026-1394/61/1a/04006","DOIUrl":"https://doi.org/10.1088/0026-1394/61/1a/04006","url":null,"abstract":"National Metrology Institutes from 6 African countries, namely Egypt, Nigeria, Zambia, Zimbabwe, Botswana, and Mauritius have participated in an international supplementary comparison on the calibration of pin gauges. This comparison was a part of larger supplementary comparison between 13 African countries for the calibration of hand measuring instruments. This larger comparison which was carried out during the period between December 2019 - December 2022 has been piloted by NIS, Egypt and has been registered in BIPM-KCDB database on December 2019. The artifacts have been prepared by NIS, Egypt and measured before sent to circulate between all participant countries in round-robin scheme and returned back again for NIS, Egypt where a final measurement is made for stability check. The main purpose of these comparisons is to support submission of CMCs for calibration of hand length measuring instruments in BIPM-KCDB. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/. The final report has been peer-reviewed and approved for publication by the CCL, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).","PeriodicalId":18444,"journal":{"name":"Metrologia","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bilateral comparisons of reference switching impulse voltage measuring systems COOMET 707Ru-a16 (COOMET_EM-S21) 参考开关脉冲电压测量系统 COOMET 707Ru-a16 (COOMET_EM-S21) 的双边比较

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-07-30 DOI: 10.1088/0026-1394/61/1a/01007

Victor Kiselev, Elena Gromochkova, Tatiana Dubrovskaya, Johann Meisner, Gerrit Krzywania

引用次数: 0

Key comparison BIPM.RI(I)-K8 of high dose-rate 192Ir brachytherapy standards for reference air kerma rate of the VSL and the BIPM 高剂量率 192Ir 近距离放射治疗标准 BIPM.RI(I)-K8 与 VSL 和 BIPM 的参考空气灼烧率的关键比较

IF 2.4 3区工程技术

Metrologia Pub Date : 2024-07-30 DOI: 10.1088/0026-1394/61/1a/06010

C Kessler, B J Jansen, J A de Pooter, P Aviles Lucas

引用次数: 0