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Items: 1 to 50 of 78

1.

A prototype of a portable optical sensor for the detection of transparent and translucent microplastics in freshwater.

Asamoah BO, Kanyathare B, Roussey M, Peiponen KE.

Chemosphere. 2019 Sep;231:161-167. doi: 10.1016/j.chemosphere.2019.05.114. Epub 2019 May 17.

2.

Outlook on optical identification of micro- and nanoplastics in aquatic environments.

Peiponen KE, Räty J, Ishaq U, Pélisset S, Ali R.

Chemosphere. 2019 Jan;214:424-429. doi: 10.1016/j.chemosphere.2018.09.111. Epub 2018 Sep 20.

PMID:
30273875
3.
4.

Wavelength-dependent excess permittivity as indicator of kerosene in diesel oil.

Kanyathare B, Peiponen KE.

Appl Opt. 2018 Apr 20;57(12):2997-3002. doi: 10.1364/AO.57.002997.

PMID:
29714328
5.

Investigating elastic relaxation effects on the optical properties of functionalised calcium carbonate compacts using optics-based Heckel analysis.

Bawuah P, Karttunen AP, Markl D, Ridgway C, Korhonen O, Gane P, Zeitler JA, Ketolainen J, Peiponen KE.

Int J Pharm. 2018 Jun 10;544(1):278-284. doi: 10.1016/j.ijpharm.2018.04.043. Epub 2018 Apr 22.

PMID:
29689369
6.

Effect of a live attenuated vaccine against Lawsonia intracellularis in weaned and finishing pig settings in Finland.

Peiponen KS, Tirkkonen BT, Junnila JJT, Heinonen ML.

Acta Vet Scand. 2018 Mar 23;60(1):18. doi: 10.1186/s13028-018-0374-8.

7.

Characterisation of pore structures of pharmaceutical tablets: A review.

Markl D, Strobel A, Schlossnikl R, Bøtker J, Bawuah P, Ridgway C, Rantanen J, Rades T, Gane P, Peiponen KE, Zeitler JA.

Int J Pharm. 2018 Mar 1;538(1-2):188-214. doi: 10.1016/j.ijpharm.2018.01.017. Epub 2018 Jan 16. Review.

8.

Fast and non-destructive pore structure analysis using terahertz time-domain spectroscopy.

Markl D, Bawuah P, Ridgway C, van den Ban S, Goodwin DJ, Ketolainen J, Gane P, Peiponen KE, Zeitler JA.

Int J Pharm. 2018 Feb 15;537(1-2):102-110. doi: 10.1016/j.ijpharm.2017.12.029. Epub 2017 Dec 13.

9.

On the role of API in determining porosity, pore structure and bulk modulus of the skeletal material in pharmaceutical tablets formed with MCC as sole excipient.

Ridgway C, Bawuah P, Markl D, Zeitler JA, Ketolainen J, Peiponen KE, Gane P.

Int J Pharm. 2017 Jun 30;526(1-2):321-331. doi: 10.1016/j.ijpharm.2017.04.038. Epub 2017 Apr 19.

10.

Optics-based compressibility parameter for pharmaceutical tablets obtained with the aid of the terahertz refractive index.

Chakraborty M, Ridgway C, Bawuah P, Markl D, Gane PAC, Ketolainen J, Zeitler JA, Peiponen KE.

Int J Pharm. 2017 Jun 15;525(1):85-91. doi: 10.1016/j.ijpharm.2017.03.093. Epub 2017 Apr 2.

11.

Reflectometric monitoring of the dissolution process of thin polymeric films.

Laitinen R, Räty J, Korhonen K, Ketolainen J, Peiponen KE.

Int J Pharm. 2017 May 15;523(1):127-132. doi: 10.1016/j.ijpharm.2017.03.028. Epub 2017 Mar 18.

PMID:
28323100
12.

Characterization of the Pore Structure of Functionalized Calcium Carbonate Tablets by Terahertz Time-Domain Spectroscopy and X-Ray Computed Microtomography.

Markl D, Wang P, Ridgway C, Karttunen AP, Chakraborty M, Bawuah P, Pääkkönen P, Gane P, Ketolainen J, Peiponen KE, Zeitler JA.

J Pharm Sci. 2017 Jun;106(6):1586-1595. doi: 10.1016/j.xphs.2017.02.028. Epub 2017 Mar 4.

13.
14.

Noninvasive porosity measurement of biconvex tablets using terahertz pulses.

Bawuah P, Ervasti T, Tan N, Zeitler JA, Ketolainen J, Peiponen KE.

Int J Pharm. 2016 Jul 25;509(1-2):439-443. doi: 10.1016/j.ijpharm.2016.06.023. Epub 2016 Jun 8.

PMID:
27289013
15.

Terahertz study on porosity and mass fraction of active pharmaceutical ingredient of pharmaceutical tablets.

Bawuah P, Tan N, Tweneboah SN, Ervasti T, Axel Zeitler J, Ketolainen J, Peiponen KE.

Eur J Pharm Biopharm. 2016 Aug;105:122-33. doi: 10.1016/j.ejpb.2016.06.007. Epub 2016 Jun 8.

PMID:
27288937
16.

A structure parameter for porous pharmaceutical tablets obtained with the aid of Wiener bounds for effective permittivity and terahertz time-delay measurement.

Bawuah P, Chakraborty M, Ervasti T, Zeitler JA, Ketolainen J, Gane PA, Peiponen KE.

Int J Pharm. 2016 Jun 15;506(1-2):87-92. doi: 10.1016/j.ijpharm.2016.04.026. Epub 2016 Apr 16.

PMID:
27094355
17.

Estimation of Young's modulus of pharmaceutical tablet obtained by terahertz time-delay measurement.

Peiponen KE, Bawuah P, Chakraborty M, Juuti M, Zeitler JA, Ketolainen J.

Int J Pharm. 2015 Jul 15;489(1-2):100-5. doi: 10.1016/j.ijpharm.2015.04.068. Epub 2015 Apr 28.

PMID:
25934425
18.

Inverse Abbe-method for observing small refractive index changes in liquids.

Räty J, Peiponen KE.

Talanta. 2015 May;137:143-7. doi: 10.1016/j.talanta.2015.01.023. Epub 2015 Jan 28.

PMID:
25770617
19.

Non-contact weight measurement of flat-faced pharmaceutical tablets using terahertz transmission pulse delay measurements.

Bawuah P, Silfsten P, Ervasti T, Ketolainen J, Zeitler JA, Peiponen KE.

Int J Pharm. 2014 Dec 10;476(1-2):16-22. doi: 10.1016/j.ijpharm.2014.09.027. Epub 2014 Sep 20.

PMID:
25245546
20.

Detection of porosity of pharmaceutical compacts by terahertz radiation transmission and light reflection measurement techniques.

Bawuah P, Pierotic Mendia A, Silfsten P, Pääkkönen P, Ervasti T, Ketolainen J, Zeitler JA, Peiponen KE.

Int J Pharm. 2014 Apr 25;465(1-2):70-6. doi: 10.1016/j.ijpharm.2014.02.011. Epub 2014 Feb 12.

PMID:
24530384
21.

A wide spectral range reflectance and luminescence imaging system.

Hirvonen T, Penttinen N, Hauta-Kasari M, Sorjonen M, Peiponen KE.

Sensors (Basel). 2013 Oct 25;13(11):14500-10. doi: 10.3390/s131114500.

22.

Determination of the refractive index of microparticles by utilizing light dispersion properties of the particle and an immersion liquid.

Niskanen I, Räty J, Peiponen KE.

Talanta. 2013 Oct 15;115:68-73. doi: 10.1016/j.talanta.2013.04.032. Epub 2013 Apr 20.

PMID:
24054563
23.

Optical and terahertz spectra analysis by the maximum entropy method.

Vartiainen EM, Peiponen KE.

Rep Prog Phys. 2013 Jun;76(6):066401. doi: 10.1088/0034-4885/76/6/066401. Epub 2013 May 10. Review.

PMID:
23660584
24.

Broadening of a THz pulse as a measure of the porosity of pharmaceutical tablets.

Peiponen KE, Silfsten P, Pajander J, Ketolainen J.

Int J Pharm. 2013 Apr 15;447(1-2):7-11. doi: 10.1016/j.ijpharm.2013.02.041. Epub 2013 Feb 24.

PMID:
23462367
25.

Phase retrieval of reflectance for nanoparticle optical identification.

Saarinen JJ, Uozumi J, Vartiainen EM, Peiponen KE.

Opt Lett. 2012 Jun 15;37(12):2202-4. doi: 10.1364/OL.37.002202.

PMID:
22739855
26.

Roughened glass slides and a spectrophotometer for the detection of the wavelength-dependent refractive index of transparent liquids.

Niskanen I, Räty J, Myllylä R, Sutinen V, Matsuda K, Homma K, Silfsten P, Peiponen KE.

Appl Spectrosc. 2012 Jul;66(7):786-90. doi: 10.1366/11-06559. Epub 2012 Jun 15.

PMID:
22709579
27.

A study on the resolution of a terahertz spectrometer for the assessment of the porosity of pharmaceutical tablets.

Ervasti T, Silfsten P, Ketolainen J, Peiponen KE.

Appl Spectrosc. 2012 Mar;66(3):319-23. doi: 10.1366/11-06315.

PMID:
22449310
28.

Assessment of wavelength dependent complex refractive index of strongly light absorbing liquids.

Räty J, Pääkkönen P, Peiponen KE.

Opt Express. 2012 Jan 30;20(3):2835-43. doi: 10.1364/OE.20.002835.

PMID:
22330520
29.

Optical properties of suspensions of organic and inorganic red pigments.

Heuer J, Niskanen I, Klein S, Peiponen KE.

Appl Spectrosc. 2011 Oct;65(10):1181-6. doi: 10.1366/11-06246.

PMID:
21986078
30.
31.

Causality-based method for determining the time origin in terahertz emission spectroscopy.

Unuma T, Ino Y, Peiponen KE, Vartiainen EM, Kuwata-Gonokami M, Hirakawa K.

Opt Express. 2011 Jun 20;19(13):12759-65. doi: 10.1364/OE.19.012759.

PMID:
21716518
32.

Light transmission model for determination of the refractive index of solid particles in suspensions: an immersion study.

Räty J, Niskanen I, Myllylä R, Peiponen KE.

Appl Spectrosc. 2011 May;65(5):557-60. doi: 10.1366/10-06148.

PMID:
21513600
33.

Kramers-Kronig analysis on the real refractive index of porous media in the terahertz spectral range.

Silfsten P, Kontturi V, Ervasti T, Ketolainen J, Peiponen KE.

Opt Lett. 2011 Mar 1;36(5):778-80. doi: 10.1364/OL.36.000778.

PMID:
21368980
34.

Measurement of the refractive index of highly turbid media: comment.

Peiponen KE, Räty J, Niskanen I.

Opt Lett. 2010 Dec 15;35(24):4108. doi: 10.1364/OL.35.004108.

PMID:
21165105
35.

Definition and measurement of statistical gloss parameters from curved objects.

Kuivalainen K, Oksman A, Peiponen KE.

Appl Opt. 2010 Sep 20;49(27):5081-6. doi: 10.1364/AO.49.005081.

PMID:
20856281
36.

Determination of the time origin by the maximum entropy method in time-domain terahertz emission spectroscopy.

Unuma T, Ino Y, Kuwata-Gonokami M, Vartiainen EM, Peiponen KE, Hirakawa K.

Opt Express. 2010 Jul 19;18(15):15853-8. doi: 10.1364/OE.18.015853.

PMID:
20720967
37.

Optical sensing of concentration and refractive index of pigments in a suspension.

Niskanen I, Räty J, Peiponen KE.

Appl Opt. 2010 Jun 10;49(17):3428-33. doi: 10.1364/AO.49.003428.

PMID:
20539363
38.
39.

A method for the detection of the refractive index of irregular shape solid pigments in light absorbing liquid matrix.

Niskanen I, Räty J, Peiponen KE.

Talanta. 2010 Jun 15;81(4-5):1322-4. doi: 10.1016/j.talanta.2010.02.027. Epub 2010 Feb 16.

PMID:
20441901
40.

Using modified Kramers-Kronig relations to test transmission spectra of porous media in THz-TDS.

Tuononen H, Gornov E, Zeitler JA, Aaltonen J, Peiponen KE.

Opt Lett. 2010 Mar 1;35(5):631-3. doi: 10.1364/OL.35.000631.

PMID:
20195301
41.

Wiener bounds for complex permittivity in terahertz spectroscopy: case study of two-phase pharmaceutical tablets.

Tuononen H, Fukunaga K, Kuosmanen M, Ketolainen J, Peiponen KE.

Appl Spectrosc. 2010 Jan;64(1):127-31.

PMID:
20132608
42.

Robust sensor for turbidity measurement from light scattering and absorbing liquids.

Kontturi V, Turunen P, Uozumi J, Peiponen KE.

Opt Lett. 2009 Dec 1;34(23):3743-5. doi: 10.1364/OL.34.003743.

PMID:
19953181
43.

Statistical parameters and analysis of local contrast gloss.

Oksman A, Juuti M, Peiponen KE.

Opt Express. 2008 Aug 4;16(16):12415-22.

PMID:
18679518
44.

Materials cohesion and interaction forces.

Rosenholm JB, Peiponen KE, Gornov E.

Adv Colloid Interface Sci. 2008 Sep 1;141(1-2):48-65. doi: 10.1016/j.cis.2008.03.001. Epub 2008 Mar 14.

PMID:
18468568
45.

Estimation of effective refractive index of birefringent particles using a combination of the immersion liquid method and light scattering.

Niskanen I, Räty J, Peiponen KE.

Appl Spectrosc. 2008 Apr;62(4):399-401. doi: 10.1366/000370208784046876.

PMID:
18416898
46.

Sensor for the detection of local contrast gloss of products.

Oksman A, Juuti M, Peiponen KE.

Opt Lett. 2008 Apr 1;33(7):654-6.

PMID:
18382507
47.

Estimation of the wavelength-dependent effective refractive index of spherical plastic pigments in a liquid matrix.

Peiponen KE, Jääskeläinen AJ, Vartiainen EM, Räty J, Tapper U, Richard O, Kauppinen EI, Lumme K.

Appl Opt. 2001 Oct 20;40(30):5482-6.

PMID:
18364832
48.
49.
50.

Dispersion relations for testing the validity of linear and nonlinear optical spectra.

Gornov E, Peiponen KE.

Appl Opt. 2007 Aug 20;46(24):6081-3.

PMID:
17712370

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