Wyniki wyszukiwania

1

Optical properties of stems and leaves of apple trees

100%

Tokarz K., Pilarski J.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

2

Water optical properties during upwelling events along the Hel Peninsula [the Baltic Sea]

88%

Matciak M., Kaluzny M., Gromisz S., Kozlowski L., Szymelfenig M.

Oceanological and Hydrobiological Studies

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2005

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tom 34

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nr Suppl.2

3

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Spectral dependence of the correlation between the backscattering coefficient and the volume scattering function measured in the Southern Baltic Sea

75%

Freda W.

Oceanologia

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2012

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tom 54

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nr 3

Direct measurements of the backscattering coefficient bb require the determination of the Volume Scattering Function (VSF) and its integration over a backward hemisphere. In sea water they are difficult and are therefore carried out very rarely. That is why the backscattering coefficient is much more frequently obtained with so-called single angle scattering meters: these operate by measuring the VSF for a fixed angle region of the backward hemisphere. This article examines the spectral variability of the correlation between directly measured backscattering coefficients and VSFs. Also presented are the averaged slopes of VSF spectra, measured in southern Baltic waters over a wide range of scattering angles.

4

Aerosol optical properties over Svalbard: a comparison between Ny-Alesund and Hornsund

75%

Pakszys P., Zielinski T.

Oceanologia

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2017

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tom 59

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nr 4

This paper presents the CAMS model based aerosol optical properties calculated for two Spitsbergen fjords, Kongsfjorden (Ny-Ålesund) and Hornsund (Polish Polar Station in Hornsund) measured between 2010 and 2015. A small decrease in Aerosol Optical Depth (AOD) is shown throughout the study period leading to an alteration of the state of the polar atmosphere. However, the potential differences observed between the stations were not statistically significant. While during the studied period no significant differences in chemical composition between the stations were observed, increasing mean values of Black Carbon (BC) were found to be associated with an increasing number of wild forest fires in remote areas producing smoke plumes, which are further transported over vast distances and reach Spitsbergen.

5

The basis optical properties of the water in the Ezcurra Inlet

75%

Olszewski J.

Oceanologia

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1983

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tom 15

6

Decomposition study of in vivo phytoplankton absorption spectra aimed at identifying the pigments and the phytoplankton group in complex case 2 coastal waters of the Arabian Sea

75%

Shaju S. S., Minu P., Srikanth A. S., Ashraf P. M., Vijayan A. K., Meenakumari B.

Oceanological and Hydrobiological Studies

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2015

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tom 44

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nr 3

7

Optical properties of maize seeds

75%

Hernandez A., Cruz O., Ivanov R., Dominguez P., Carballo C., Moreno I.

International Agrophysics

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2011

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tom 25

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nr 3

8

Kraft and modified kraft pulping of bamboo (Phyllostachys bambusoides)

75%

Deniz I., Okan O. T., Serdar B., Sahin H. I.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

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2017

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tom 60

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nr 200

9

Wpływ emulsji tłuszczowej na właściwości optyczne filmów serwatkowych

75%

Galus S., Lenart A.

Acta Agrophysica

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2012

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tom 19

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nr 1

Barwa oraz nieprzezroczystość to dwa parametry bardzo istotne opisujące właściwości optyczne filmów jadalnych. Celem pracy było zbadanie wpływu emulsji tłuszczowej na właściwości optyczne filmów serwatkowych wytworzonych z 10% roztworów wodnych izolatu białek serwatkowych i 50% glicerolu jako plastyfikatora względem masy białka. Roztwory ogrzewano w łaźni wodnej z wytrząsaniem 50 obr∙min-1 w temperaturze 80ºC przez 30 min. 10% emulsję oleju rzepakowego w wodzie dodawano do mieszanin powłokotwórczych w ilościach 10, 20, 30 i 40%. W pracy zmierzono barwę w systemie L*a*b* z zastosowaniem wyróżników barwy (bez-względna różnica barwy, nasycenie barwy, indeks nasycenia) oraz nieprzezroczystość przy długości fali 600 nm. Modyfikacja składu surowcowego filmów serwatkowych dodatkiem emulsji tłuszczowej spowodowała ich matowość i brak transparentności. Zaobserwowano zmianę barwy oraz zwiększanie nieprzezroczystości filmów modyfikowanych dodatkiem emulsji tłuszczowej.

10

Theoretical approach to the estimation of water optical properties from the radiance field in the sea

75%

Matciak M.

Oceanological Studies

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2001

|

tom 30

|

nr 1-2

11

Inverse methods in hydrologic optics

75%

Gordon H. R.

Oceanologia

|

2002

|

tom 44

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nr 1

Methods for solving the hydrologic-optics inverse problem, i.e., estimating the inherent optical properties of a water body based solely on measurements of the apparent optical properties, are reviewed in detail. A new method is developed for the inverse problem in water bodies in which fluorescence is important. It is shown that in principle, given profiles of the spectra of up- and downwelling irradiance, estimation of the coefficient of inelastic scattering from any wave band to any other wave band can be effected.

12

Attenuation of ultraviolet irradiance in North European coastal waters

75%

Aas E., Hojerslev N. K.

Oceanologia

|

2001

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tom 43

|

nr 2

A total of 439 measurements of downward ultraviolet irradiance in North European coastal waters have been analysed,half of which have been taken from other authors. The depths Z(10%) where the irradiance is reduced to 10% of its surface value vary by one order of magnitude in the open coastal waters,b oth at wavelengths of 310 nm (0.3–10.4 m) and 380 nm (1.2–13.0 m). In the fjords and estuaries the depth ranges are reduced to 0.08–6.1 m at 310 nm and 0.18–7.7 m at 380 nm. Mixing with saline ocean waters can increase these light penetration depths to more than 10 m,while river water can reduce them to a few centimetres.

13

Fluorometric method for determining the thickness of a crude oil film formed on the water surface

75%

Gasowski R., Mrozek-Lejman J.

Oceanologia

|

1994

|

tom 36

|

nr 2

14

Optical properties of bark and leaves of Syringa vulgaris L.

63%

Pilarski J.

Bulletin of the Polish Academy of Sciences. Biological Sciences

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1989

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tom 37

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nr 10-12

15

Impact of light spectral composition and ozone fumigation on chlorophyll content changes and optical properties of broccoli leaves

63%

Skoczowski A., Czyczylo-Mysza I., Skwarek A., Pilarski J., Grzesiak W., Nowak T.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2010

|

tom 545

The aim of the present study was to examine the influence of spectral composition of irradiation (white - WL or white supplemented by blue radiation - WBL) and ozone on chlorophyll content and the optical properties of broccoli leaves (Brassica oleracea var. botrytis cymosa). Broccoli leaves were injured by the ozone dose applied (70 ppb, 6 hours daily) mainly under WBL. Leaf lamina damage was much larger in the outer, physiologically older part than in the inner, physiologically younger part. Therefore, further studies were carried out separately on leaf fragments from the outer(OP) and the inner parts (IP). The spectrophotometric analysis did not reveal significant differences in the chlorophyll content between treatments. The variations in reflectance in the visible region (400-700 nm) were generally not significant with respect to tissue age (OP, IP), ozone fumigation and growth conditions (WBL, WL). Only in plants grown under WBL there was an increase in green reflectance in ozone-treated leaves observed, which indicates a decrease in the chlorophyll content in leaves. Thus, measurements of the optical properties of leaves provide more precise information about changes in the content of chlorophyll than spectrophotometry. Leaves under WBL showed significant differences in reflection within the range 800-1100 nm, which depended on the physiological age of the tissue. For physiologically older tissues, values of reflection were lower than those for physiologically younger tissues. However, under WL conditions, a decrease in reflection within the 800-1100 nm rangę depended only on ozone fumigation. Response of broccoli leaves to spectral composition of irradiation and ozone stress was much higher for irradiation transmission than for reflection. Compared to the control, ozone fumigation of broccoli leaves grown in WBL increased irradiation transmission in OP and IP leaf fragments, both in the 500-700 nm and 750-1100 nm ranges. For plants growing in WL no influence of ozone fumigation on the transmission of irradiation within the visible range was observed. However, fumigation with ozone resulted in a significant decrease in the transmission within the infrared range (750 to 1100 nm). The results indicate the major role of irradiation spectral composition in plant response to ozone stress. The modifications may affect Chl content, leaf temperature and, what is more important, phytochrome-controlled morphogenetic processes.

16

Testing the performance of empirical remote sensing algorithms in the Baltic Sea waters with modelled and in situ reflectance data

63%

Ligi M., Kutser T., Kallio K., Attila J., Koponen S., Paavel B., Soomets T., Reinart A.

Oceanologia

|

2017

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tom 59

|

nr 1

Remote sensing studies published up to now show that the performance of empirical (band-ratio type) algorithms in different parts of the Baltic Sea is highly variable. Best performing algorithms are different in the different regions of the Baltic Sea. Moreover, there is indication that the algorithms have to be seasonal as the optical properties of phytoplankton assemblages dominating in spring and summer are different. We modelled 15,600 reflectance spectra using HydroLight radiative transfer model to test 58 previously published empirical algorithms. 7200 of the spectra were modelled using specific inherent optical properties (SIOPs) of the open parts of the Baltic Sea in summer and 8400 with SIOPs of spring season. Concentration range of chlorophyll-a, coloured dissolved organic matter (CDOM) and suspended matter used in the model simulations were based on the actually measured values available in literature. For each optically active constituent we added one concentration below actually measured minimum and one concentration above the actually measured maximum value in order to test the performance of the algorithms in wider range. 77 in situ reflectance spectra from rocky (Sweden) and sandy (Estonia, Latvia) coastal areas were used to evaluate the performance of the algorithms also in coastal waters. Seasonal differences in the algorithm performance were confirmed but we found also algorithms that can be used in both spring and summer conditions. The algorithms that use bands available on OLCI, launched in February 2016, are highlighted as this sensor will be available for Baltic Sea monitoring for coming decades.

17

Variability of fluorescence of dissolved and suspended substances of biological origin in the Gdansk Basin during the International Ecological Experiment “Sopot 87”

63%

Karabashev G. S., Khanaev S. A., Petrosov A. Y.

Oceanologia

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1990

|

tom 28

18

Spectroboard: an instrument for measuring spectral characteristics of butterfly wings - new tool for taxonomists

63%

Balint Z., Wojtusiak J., Piszter G., Kertesz K., Biro R. P.

Genus. International Journal of Invertebrate Taxonomy

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2010

|

tom 21

|

nr 1

19

The impact of UV mediated hydrogen peroxide on culturable bacteria in the surface microlayer of eutrophic lake

63%

Walczak M., Swiontek Brzezinska M.

Polish Journal of Ecology

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2009

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tom 57

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nr 3

547-554

Hydrogen peroxide (H₂O₂) formation in surface waters is initiated by the absorption of sunlight by dissolved organic matter (DOM). The fraction of the DOM pool that interacts with sunlight, referred to as chromophoric dissolved organic matter, impacts the optical properties of surface waters. Second source of H₂O₂ is wet and dry deposition of photogenerated substance in the atmosphere and biological production. The study examined the concentration of hydrogen peroxide in water from the surface microlayer (SM) (<100 m) and subsurface water (SSW) (25 cm) in the typical eutrophic (TOC 5–15 mg dm⁻³; chlorophyll 5–26 g dm⁻³, water transparency 0.6–1.0 m) lake as well as the impact of this compound on occurrence and survivorship of catalase-positive and catalase-negative bacteria isolated and cultured on the TSA medium (Difco). The experimental H₂O₂ concentrations ranged between 500–5000 nM. The concentration of H₂O₂ in analyzed water samples clearly increased in day-time hours and was different in May, July and October. The highest natural concentration of H₂O₂ (700 nM) was observed in SM water in summer in afternoon hours. During that period, 100% of bacterial populations found in SM water produced catalase. The experiments confirmed that environmental concentrations of H₂O₂ caused no considerable decrease in survivorship of culturable bacteria, while concentrations exceeding 1000 nM were lethal for the majority of catalasenegative bacteria, but not for catalase-positive bacteria.

20

A study of the Baltic water optical transparency

63%

Dera J., Sagan S.

Oceanologia

|

1990

|

tom 28

Ograniczanie wyników

Optical properties of stems and leaves of apple trees

Water optical properties during upwelling events along the Hel Peninsula [the Baltic Sea]

Spectral dependence of the correlation between the backscattering coefficient and the volume scattering function measured in the Southern Baltic Sea