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1 .
Closure to 'Prospects for No-Dig Technology in Hong
Kong
Construction Industry' by
S
. H. Pau, K.
W
. Chau, and
W
.
G
. Wong
저자
by
W. G. Wong
;
Kwok Wing Chau
;
S. H. Pau
.
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Journal of Construction Engineering and Management
. 121:160-163
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5 .
César Augusto Restrepo Valencia, Consuelo Vélez Álvarez Abstract Objective. To evaluate the effectiveness of calcineurin ciclosporin and tacrolimus inhibitors to induce remission in patients with refractory lupus nephritis. Patients, materials and methods. Patients with lupus nephritis class IV-
G
who despite receiving therapy with high doses of steroid and with a cytostatic (cyclophosphamide or mycophenolate) for 3 months had not been able to induce some kind of remission.The exclusion criteria were creatinine levels greater than 3 mg / dl, pregnancy, previous history of exposure to calcineurin inhibitors, cancer, active infections, uncontrolled hypertension, and negligence with medication intake. The recommended dose of cyclosporine was 3 mg / kg / day and tacrolimus 0.1 mg / kg / day, in joint with prednisone 0.3 mg / kg / day, cyclophosphamide 1 mg / kg / day or mycophenolate mofetil 1 gram every 12 hours. The cyclophosphamide was administered only during 6 months, after which it was changed to azathioprine at doses of 1 mg / kg / day. Still, mycophenolate was continued at the same dose. All patients completed a minimum period of 12 months follow-up, it was considered that patients achieved partial remission when proteinuria decreased by 50% of the baseline value or its value decreased to less than 1 gram in 24 hours, decrease of leukocytes count and red blood cells in urine of 50%, and creatinine values were stable. A complete remission was considered when there was a reduction in proteinuria in a value less than 300 mg per 24 hours, urinary sediment with less than 3 red blood cells, less than 5 leukocyte for each high power microscopic field, and a creatinine value reduction by 50% or reaching a normal value. Results. Twelve patients met the inclusion criteria and initiated the calcineurin inhibitor protocol. Two presented accelerated deterioration in their function and required chronic dialysis therapy. Ten patients with active treatment completed 12 months of follow-up, of which 4 (40%) had partial remission (PR), 5 (50%) complete remission (RC). One patient had no significant modification to his baseline values. The following findings were made for all the patients with any significant degree of remission: their creatinine levels were reduced significantly from an average value of 1,34 +/-0,7 mg/dl to an average of 0,96 +/- 0,3 mg/dl and 0,97 +/- 0,24 mg/dl for measurements taken 6 and 12 months respectively after the start of the treatment (p<0,05). The protein levels in the urine in a timeframe of 24 hours changed from a baseline value of 2865 +/- 2586.7 milligrams to 824 +/- 981.9 milligrams at 6 months, and 488 +/- 697.7 milligrams at 12 months (p <0.05). On average, in both PR and CR patients, the C3 levels raised unlike the values for antinuclear antibodies that were diminished. No patients died, nor were there significant side effects triggered by medications. No patient presented relapses during the follow-up time. Conclusion. The calcineurin inhibitors at low doses are an important alternative to induce partial or complete remission in patients with refractory lupus nephritis compared to classic steroid and cytostatic treatment. It is required to do a long-term follow-up to establish its safety profile at low doses and relapse rate after suspension. Keywords Lupus nephritis, cyclosporine, tacrolimus. References Cameron J
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. Lupus Nephritis. J Am Soc Nephrol 10:413-424. Cervera R, Khamashta MA, Font J, Sebastiani GD, Gil A, Lavilla P, Mejía JC, Aydintug AO, Chwalinska-Sadowska H, de Ramón E, Fernández-Nebro A, Galeazzi M, Valen M, Mathieu A, Houssiau F, Caro N, Alba P, Ramos-Casals M, Ingelmo M, Hughes GR; European Working Party on Systemic Lupus Erythematosus. Morbidity and mortality in systemic lupus erythematosus during a 10-year period: a comparison of early and late manifestations in a cohort of 1,000 patients. Medicine (Baltimore). 2003;82:299-308. Austin HA 3rd, Klippel JH, Balow JE, le Riche NG, Steinberg AD, Plotz PH, Decker JL. Therapy of lupus nephritis. Controlled trial of prednisone and cytotoxic drugs. N Engl J Med. 1986 Mar 6;314(10):614-619. Boumpas DT, Austin HA 3rd, Vaughn EM, Klippel JH, Steinberg AD, Yarboro CH, Balow JE. Controlled trial of pulse methylprednisolone versus two regimens of pulse cyclophosphamide in severe lupus nephritis. Lancet. 1992;340:741- 45. Gourley MF, Austin HA 3rd, Scott D, Yarboro CH, Vaughan EM, Muir J, Boumpas DT, Klippel JH, Balow JE, Steinberg AD. Methylprednisolone and cyclophosphamide, alone or in combination, in patients with lupus nephritis. A randomized, controlled trial. Ann Intern Med. 1996;125:549-557. Walsh M, James M, Jayne D, Tonelli M, Manns BJ, Hemmelgarn BR. Mycophenolate mofetil for induction therapy of lupus nephritis: a systematic review and meta-analysis. Clin J Am Soc Nephrol. 2007;2:968-975. Dooley MA, Hogan
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, Jennette C, Falk R. Cyclophosphamide therapy for lupus nephritis: poor renal survival in black Americans. Glomerular Disease Collaborative Network. Kidney Int. 1997;51:1188-1195. Austin HA 3rd, Boumpas DT, Vaughan EM, Balow JE. Predicting renal outcomes in severe lupus nephritis: contributions of clinical and histologic data. Kidney Int. 1994;45:544-550. Bakir AA, Levy PS, Dunea
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. The prognosis of lupus nephritis in African-Americans: a retrospective analysis. Am J Kidney Dis. 1994;24:159-171. Barr RG, Seliger
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, Appel GB, Zuniga R, D’Agati V, Salmon J, Radhakrishnan J.Prognosis in proliferative lupus nephritis: the role of socio-economic status and race/ethnicity. Nephrol Dial Transplant. 2003;18:2039-2046. Hochberg MC. Updating the American College of Rheumatology revised criteria for the classification of systemic lupus erythematosus. Arthritis Rheum. 1997;40:1725. Weening JJ, D’Agati VD, Schwartz MM, Seshan SV, Alpers CE, Appel GB, Balow JE, Bruijn JA, Cook T, Ferrario F, Fogo AB, Ginzler EM, Hebert L, Hill
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, Hill P, Jennette JC,
Kong
NC, Lesavre P, Lockshin M, Looi LM, Makino H, Moura LA, Nagata M, International Society of Nephrology Working Group on the Classification of Lupus Nephritis, Renal Pathology Society Working Group on the Classification of Lupus Nephritis. Kidney Int. 2004;65:521-530. Houssiau FA, Vasconcelos C, D’Cruz D, Sebastiani GD, de Ramón Garrido E, Danieli MG, Abramovicz D, Blockmans D, Cauli A, Direskeneli H, Galeazzi M, Gül A, Levy Y, Petera P, Popovic R, Petrovic R, Sinico RA, Cattaneo R, Font J, Depresseux
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, Cosyns JP, Cervera R. The 10-year follow-up data of the Euro-Lupus Nephritis Trial comparing low-dose and high-dose intravenous cyclophosphamide. Ann Rheum Dis. 2010;69:61. Nefropatia lúpica. Serna Flórez J, Restrepo Valencia C A en Nefrología Básica 2. Restrepo CA, Buitrago CA, Torres J, Serna J. Editorial La Patria, 2012, pág. 113-120, Manizales. KDIGO Clinical Practice Guideline for Glomerulonephritis. Kidney Int 2012;Suppl 2:143-153, Chapter 12: Lupus nephritis. American College of Rheumatology Guidelines for Screening, Treatment, and Management of Lupus Nephritis. Arthritis Care Res Volume 2012;64:797-808. The Joint European League Against Rheumatism and European Renal Association-European Dialysis and Transplant Association (EULAR/ERA-EDTA) recommendation for the management of adult and paediatric lupus nephritis. Ann Rheum Dis 2012;71:1771-1782. Griffiths B, Emery P. The treatment of lupus with cyclosporin A. Lupus. 2001;10(3):165-170. Gordon C, Matthews N, Schlesinger B C, Akbar A N, Bacon P A, Emery P, Salmon M. Active systemic lupus erythematosus is associated with the recruitment of naive/resting t cells. Rheumatology 1996;35:226-230. Favre H, Miescher P A, Huang Y P et al. Cyclosporin in the treatment of lupus nephritis. Am J Nephrol 1989;9(suppl):57-60. Rihova Z, Vankova Z, Maixnerova D, Dostal C, Jancova E, Honsova E, Merta M, Rysava R, Tesar V. Treatment of lupus nephritis with cyclosporine - an outcome analysis. Kidney Blood Press Res. 2007;30(2):124-128. Tam L
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, Li E K, Leung C B, Wong K C, Lai F M M, Wang A, Szeto C C, Lui
S
F. Long term treatment of lupus nephritis with cyclosporin A. Q J Med 1998;91:573-580. Ferrario L, Bellone M, Bozzolo E, Baldissera E, Sabbadini M
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. Remission from lupus nephritis resistant to cyclophosphamide after additional treatment with cyclosporin A. Rheumatology 2000;39:218-220. Manger K, Kalden J R, Manger B. Cyclosporin A in the treatment of systemic lupus erythematosus: results of an open clinical study. British J Rheumatology 1996;35:669-675. Tokuda M, Kurata N, Mizoguchi A, Inoh M, Seto K, Kinashi M, Takahara J. Effect of low-dose cyclosporin A on systemic lupus erythematosus disease activity. Arthritis Rheumatism 1994;37:551-558. Caccavo D, Laganà B, Mitterhofer AP, Ferri GM, Afeltra A, Amoroso A, Bonomo L. Long-term treatment of systemic lupus erythematosus with cyclosporin A. Arthritis Rheumatism 1997;40:27-35. Ogawa H, Kameda H, Amano K, Takeuchi T. Efficacy and safety of cyclosporine A in patients with refractory systemic lupus erythematosus in a daily clinical practice. Lupus 2010;19:162-169. Ogawa H, Kameda H, Nagasawa H, Sekiguchi N, Takei H, Tsuzaka K, Amano K, Takeuchi T. Prospective study of low-dose cyclosporine A in patients with refractory lupus nephritis. Mod Rheumatol 2007;17:92-97. Baca V, Catalán T, Villasís-Keever M, Ramón
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, Morales AM, Rodríguez-Leyva F. Effect of low-dose cyclosporine A in the treatment of refractory proteinuria in childhood-onset lupus nephritis. Lupus 2006;15:490-495. Politt D, Heintz B, Floege J, Mertens PR. Tacrolimus- (FK 506) based immunosuppression in severe systemic lupus erythematosus. Clinical Nephrology 2004;62:49-53. Duddridge M, Powell RJ. Treatment of severe and difficult cases f systemic lupus erythematosus with tacrolimus. Areport of three cases. Ann Rheum Dis 1997;56:690-692. Uchino A, Tsukamoto H, Nakashima H, Yoshizawa
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, Furugo I, Mitoma H, Oryoji K, Shimoda T, Niiro H, Tada Y, Yano T, Nonaka T, Oishi R, Akashi K, Horiuchi T. Safety and potential efficacy of tacrolimus for treatment of lupus nephritis with persistent proteinuria. Clinical Experimental Rheumatology 2010;28:6-12. Fei Y, Wu Q, Zhang
W
, Chen H, Hou Y, Xu D, Li M, Zhang X, Zhao Y, Zeng X, Zhang F. Low dose tacrolimus in treating lupus nephritis refractory to cyclophosphamide: a prospective cohort study. Clin Exp Rheumatol 2013;31:62-68. Gordon
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, Denunzio T, Uy A. Success using tacrolimus in patients with proliferative and membranous lupus nephritis and refractory proteinuria. Hawaii J Med Public Health 2013;72:18-23. Wang
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, Li X, Qu L, Wang R, Chen Y, Li Q, He X, Zhang X, Wang H, Wu J, Xu Y, Chen J. Tacrolimus versus cyclophosphamide as treatment for diffuse proliferative or membranous lupus nephritis: a non-randomized prospective cohort study. Lupus 2012;21:1025-1035. Deng J, Huo D, Wu Q, Yang Z, Liao Y. A meta-analysis of randomized controlled trials comparing tacrolimus with intravenous cyclophosphamide in the induction treatment for lupus nephritis. Tohoku J Exp Med 2012;227:281-288. Chen
W
, Liu Q, Chen
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, Tang X, Fu P, Liu F, Liao Y, Yang Z, Zhang J, Chen J, Lou T, Fu J,
Kong
Y, Liu Z, Li Z, Yu X. Outcomes of maintenance therapy with tacrolimus versus azathioprine for active lupus nephritis: a multicenter randomized clinical trial. Lupus 2012;21:944-952. Full Text: PDF (Español (España)) PDF DOI: 10.22265/acnef.1.2.179 Refbacks There are currently no refbacks. Copyright (c) User Username Password Remember me This journal follows the principles and procedures given by the Committee on Publication Ethics (COPE) www.publicationethics.org Instructions for authors How to submit an article How to upload a modified version Instructions for reviewers How to review an article Instructions for associate editors How to send it to reviewers How to send corrections to authors Language Select Language Journal Content Search Search Scope Browse By Issue By Author By Title About The Authors César Augusto Restrepo Valencia Facultad de Ciencias para la Salud, Departamento de Medicina Interna, Universidad de Caldas, Manizales, Colombia Colombia Consuelo Vélez Álvarez Grupo de Investigación Promoción de la Salud y revención de la enfermedad, Facultad de Ciencias para la Salud, Departamento de Salud Pública Colombia Font Size Make font size smaller Make font size default Make font size larger Information For Readers For Authors For Librarians Indexaciones JournalTOCs Notifications View Subscribe Keywords Adolescence Biocompatible peritoneal dialysis solutions Chronic renal disease Glucose degradation products (GDP) Rejection chronic renal insufficiency education. fatty acids folic acid graft biopsy inflammation, Polivinil chloride (PVC), phthalates kidney Transplant peritoneal dialysis proteins. renal protection residual renal function. scintigraphy survival transition transplant. zinc
저자
by
César Augusto Restrepo Valencia
;
Consuelo Vélez Álvarez
.
소스
Revista Colombiana de Nefrología, Vol 2, Iss 1, Pp 77-88 (2014)
Open Access (OpenAIRE)
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4 .
Full Issue Download Vol. 13 No. 1 2021 The Importance of the Measurement Infrastructure in Economic Recovery from the COVID-19 Pandemic Richard J. C. Brown , Fiona Auty, Eugenio Renedo, Mike King NCSLI Measure | Vol. 13 No. 1 (2021) | doi.org/10.51843/measure.13.1.1 Publisher NCSL International | Published February 2021 | Pages 18-21 Abstract: This paper describes the many, evidenced-based benefits to the economy of a well-developed measurement infrastructure. In particular, it explains how assuring confidence in measurement may be used to accelerate economic recovery from the COVID-19 pandemic including in emerging sectors such as the digital economy. Recommendations are made for providing near term support for national economic recovery whilst also demonstrating the advantages of sustained development of the measurement infrastructure in the medium-term to maximize the potential of future innovative and disruptive technologies. These recommendations, whilst focused on consideration of the UK, should apply globally. References: [1]
G
. Tassey, 'Underinvestment in public good technologies,' J Technol. Transfer, Vol. 30, pp. 89-113, 2004. https://doi.org/10.1007/s10961-004-4360-0 [2] M. King, and E. Renedo, 'Achieving the 2.4% GDP target: The role of measurement in increasing investment in R&D and innovation,' NPL Report IEA 3, NPL, Teddington, UK, March 2020. [3] M. King and
G
. Tellett, 'The National Measurement System: A Customer Survey for Three of the Core Labs in the National Measurement System,' NMS Customer Survey Report 2018, NPL Teddington, UK, April 2020 [4] H. Kunzmann, T. Pfeifer, R. Schmitt, H. Schwenke, and A.Weckenmann, 'Productive metrology-adding value to manufacture,' CIRP Annals, vol. 54, pp. 155-168, 2005. https://doi.org/10.1016/S0007-8506(07)60024-9 [5] N.
G
. Orji, R.
G
. Dixson, A. Cordes, B. D. Bunday, and J. A. Allgair, 'Measurement traceability and quality assurance in a nanomanufacturing environment,' Instrumentation, Metrology, and Standards for Nanomanufacturing III, Proceedings Vol. 7405, 740505, August 2009. https://doi.org/10.1117/12.826606 [6] Belmana, Analysis for Policy 'Public Support for Innovation and Business Outcomes,' Belmana: London, UK, 2020. [7] R. Hawkins, Standards, systems of innovation and policy in Handbook of Innovation and Standards. Cheltenham, UK: Edward Elgar, 2019. [8] N. Nwaigbo, and M. King, 'Evaluating the Impact of the NMS Consultancy Projects on Supported Firms (Working Paper)' NPL, Teddington, UK, 2020. [9] M. King, R. Lambert, and P. Temple, Measurement, standards and productivity spillovers in Handbook of Innovation and Standards. Cheltenham, UK: Edward Elgar, 2017, p. 162. https://doi.org/10.4337/9781783470082.00016 [10] A. Font, K. de Hoogh, M. Leal-Sanchez, D. C. Ashworth, R. J. C. Brown, A. L. Hansell, and
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.
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. Fuller, 'Using metal ratios to detect emissions from municipal waste incinerators in ambient air pollution data,' Atmos. Environ., vol. 113, pp. 177-186, July 2015. https://doi.org/10.1016/j.atmosenv.2015.05.002 [11]
S
. Giannis, M. R. L. Gower,
G
. D. Sims,
G
. Pask, and
G
. Edwards, 'Increasing UK competitiveness by enhancing the composite materials regulatory infrastructure,' NPL Report MAT 90, NPL, Teddington, UK, October 2019. [12] HM Government, UK Research and Development Roadmap, BEIS, London, July 2020. [13] M. R. Mehra,
S
.
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. Desai, F. Ruschitzka, and A. N. Patel, 'Hydroxychloroquine or chloroquine with or without a macrolide for treatment of COVID-19: a multinational registry analysis,' Lancet, 2020, https://doi.org/10.1016/S0140-6736(20)31180-6 (Print: ISSN 1931-5775) (Online: ISSN 2381-0580) ©2021 NCSL International Smart Power Supply Calibration System Iraj Vasaeli , Brandon Umansky NCSLI Measure | Vol. 13 No. 1 (2021) | doi.org/10.51843/measure.13.1.2 Publisher: NCSL International | Published February 2021 | Pages 22-27 Abstract: This paper details the development of an automated procedure to conduct calibrations of power supplies at Jet Propulsion Laboratory, California Institute of Technology (JPL). The fundamentals of power supply calibrations are given, and discussion on the method by which this custom software handles that calibration. Additionally, this technique provides real time uncertainty quantification of the calibrations. This automated system has demonstrated a time savings over existing automated techniques in use today. References: [1] Keysight, 'Low-Profile Modular Power System Series N6700 Service Guide', Part Number: 5969 2938, Edition 7, January 2015. [2] B. N. Taylor and C. E. Kuyatt, 'Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results', NIST Technical Note 1297, 1994. https://doi.org/10.6028/NIST.TN.1297 [3] JCGM, 'Evaluation of measurement data - Guide to the expression of uncertainty in measurement,' first edition (GUM 1995 with minor corrections),' JCGM 100, 2008. (Print: ISSN 1931-5775) (Online: ISSN 2381-0580) © 2021 NCSL International Computer Aided Verification of Voltage Dips and Short Interruption Generators for Electromagnetic Compatibility Immunity Test in Accordance with IEC 61000-4-11: 2004 + AMD: 2017 Hau Wah Lai , Cho Man Tsui , Hing Wah Li NCSLI Measure | Vol. 13 No. 1 (2021) | doi.org/10.51843/measure.13.1.3 Publisher: NCSL International | Published February 2021 | Pages 28-39 Abstract: This paper describes a procedure and a computer-aided system developed by the Standards and Calibration Laboratory (SCL) for verification of voltage dip and short interruption generators in accordance with the international standard IEC 61000-4-11:2004+AMD1:2017. The verification is done by calibrating the specified parameters and comparing with the requirements stated in the standard. The parameters that should be calibrated are the ratios of the residual voltages to the rated voltage, the accuracy of the phase angle at switching, and the rise time, fall time, overshoot and undershoot of the switching waveform. A specially built adapter is used to convert the high voltage output waveforms of the generators to lower level signals to be acquired by a digital oscilloscope. The other circuits required for the testing are also provided. In addition, the paper discusses the uncertainty evaluations for the measured parameters. References: [1] T. Williams, and K. Armstrong, 'EMC for Systems and Installations Part 6 - Low-Frequency Magnetics Fields (Emissions and Immunity) Mains Dips, Dropouts, Interruptions, Sags, Brownouts and Swells,' EMC Compliance Journal, August 2000. [2] M.I. Montrose, and E. M. Nakauchi, Testing for EMC Compliance: Approaches and Techniques, Wiley Interscience, 2004. https://doi.org/10.1002/047164465X [3] International Standard IEC 61000-4-11:2004+AMD1:2017:Electromagnetic Compatibility (EMC) Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests. [4] Evaluation of measurement data - Guide to the expression of uncertainty in measurement, First Edition JCGM 100:2008. (Print: ISSN 1931-5775) (Online: ISSN 2381-0580) © 2021 NCSL International Validation of the Photometric Method Used for Micropipette Calibration Elsa Batista , Isabel Godinho, George Rodrigues, Doreen Rumery NCSLI Measure | Vol. 13 No. 1 (2021) | doi.org/10.51843/measure.13.1.4 Publisher: NCSL International | Published February 2021 | Pages 40-45 Abstract: There are two methods generally used for calibration of micropipettes: the gravimetric method described in ISO 8655-6:2002 and the photometric method described in ISO 8655-7:2005. In order to validate the photometric method, several micropipettes of different capacities from 0.1 µL to 1000 µL were calibrated using both methods (gravimetric and photometric) in two different laboratories, IPQ (Portuguese Institute for Quality) and Artel. These tests were performed by six different operators. The uncertainty for both methods was determined and it was verified that the uncertainty component that has a higher contribution to the final uncertainty budget depends on the volume delivered. In the photometric method for small volumes, the repeatability of the pipette is the largest uncertainty component, but for volumes, larger than 100 µL, the photometric instrument is the most significant source of uncertainty. Based on all the results obtained with this study, one may consider the photometric method validated. References: [1] ISO 8655-1/2/6/7, Piston-operated volumetric apparatus, 2002. [2] BIPM, International Vocabulary of Metrology, 3rd edition, JCGM 200:2012. [3] George Rodrigues, Bias and transferability in standards methods of pipette calibration, Artel, June 2003. [4] Taylor, et.al. The definition of primary method of measurement (PMM) of the 'highest metrological quality': a challenge in understanding and communication, Accred. Qual.Assur (2001) 6:103-106. https://doi.org/10.1007/PL00010444 [5] EURAMET project 1353, Volume comparison on Calibration of micropipettes - Gravimetric and photometric methods. [6] ASTM E542: Standard Practice for Calibration of laboratory Volumetric Apparatus, 2000. [7] ISO 4787; Laboratory glassware - Volumetric glassware - Methods for use and testing of capacity, 2010 . [8] ISO 13528:2005 - Statistical methods used in proficiency testing by interlaboratory comparisons. [9] BIPM et al, Guide to the Expression of Uncertainty in Measurement (GUM), 2nd ed., International Organization for Standardization, Genève, 1995. [10] EURAMET guide, cg 19, - Guidelines on the determination of uncertainty in gravimetric volume calibration, version 3.0, 2012. [11] E. Batista et all, A Study of Factors that Influence Micropipette Calibrations, Measure Vol. 10 No. 1, 2015 https://doi.org/10.1080/19315775.2015.11721717 [12] www.BIPM.org. (Print: ISSN 1931-5775) (Online: ISSN 2381-0580) © 2021 NCSL International Material Flow Rate Estimation in Material Extrusion Additive Manufacturing
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. P. Greeff NCSLI Measure | Vol. 13 No. 1 (2021) | doi.org/10.51843/measure.13.1.5 Publisher: NCSL International | Published February 2021 | Pages 46-56 Abstract: The additive manufacturing of products promises exciting possibilities. Measurement methodologies, which measure an in-process dataset of these products and interpret the results, are essential. However, before developing such a level of quality assurance several in-process measurands must be realized. One of these is the material flow rate, or rate of adding material during the additive manufacturing process. Yet, measuring this rate directly in material extrusion additive manufacturing presents challenges. This work presents two indirect methods to estimate the volumetric flow rate at the liquefier exit in material extrusion, specifically in Fused Deposition Modeling or Fused Filament Fabrication. The methods are cost effective and may be applied in future sensor integration. The first method is an optical filament feed rate and width measurement and the second is based on the liquefier pressure. Both are used to indirectly estimate the volumetric flow rate. The work also includes a description of linking the
G
-code command to the final print result, which may be used to create a per extrusion command model of the part. References: [1] T. Wohlers, I. Campbell, O. Diegel, J. Kowen, I. Fidan, and D.L. Bourell, 'Wohlers Report 2017: 3D Printing and Additive Manufacturing State of the Industry Annual Worldwide Progress Report,' 2017. [2] Additive manufacturing -- General principles -- Terminology. Geneva, CH: International Organization for Standardization, 2015. [3] R. Jones et al., 'Reprap - The replicating rapid prototyper,' Robotica, vol. 29, no. 1 SPEC. ISSUE, pp. 177-191, 2011, https://doi.org/10.1017/S026357471000069X [4] T. Wohlers and T. Gornet, 'History of Additive Manufacturing 2017,' 2017. [5]
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. A. M. Tofail, E. P. Koumoulos, A. Bandyopadhyay,
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