Log in

Relevant bibliographies by topics / Kd coefficient / Journal articles

To see the other types of publications on this topic, follow the link: Kd coefficient.

Journal articles on the topic 'Kd coefficient'

Author: Grafiati

Published: 1 April 2023

Last updated: 31 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 'Kd coefficient.'

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

Akter, Sonia, Lis Wollesen de Jonge, Per Møldrup, et al. "Visible Near-Infrared Spectroscopy and Pedotransfer Function Well Predict Soil Sorption Coefficient of Glyphosate." Remote Sensing 15, no. 6 (2023): 1712. http://dx.doi.org/10.3390/rs15061712.

Full text

Abstract:

The soil sorption coefficient (Kd) of glyphosate mainly controls its transport and fate in the environment. Laboratory-based analysis of Kd is laborious and expensive. This study aimed to test the feasibility of visible near-infrared spectroscopy (vis–NIRS) as an alternative method for glyphosate Kd estimation at a country scale and compare its accuracy against pedotransfer function (PTF). A total of 439 soils with a wide range of Kd values (37–2409 L kg−1) were collected from Denmark (DK) and southwest Greenland (GR). Two modeling scenarios were considered to predict Kd: a combined model deve

APA, Harvard, Vancouver, ISO, and other styles

2

Zolfaghari, Kiana, Claude R. Duguay, and Homa Kheyrollah Pour. "Satellite-derived light extinction coefficient and its impact on thermal structure simulations in a 1-D lake model." Hydrology and Earth System Sciences 21, no. 1 (2017): 377–91. http://dx.doi.org/10.5194/hess-21-377-2017.

Full text

Abstract:

Abstract. A global constant value of the extinction coefficient (Kd) is usually specified in lake models to parameterize water clarity. This study aimed to improve the performance of the 1-D freshwater lake (FLake) model using satellite-derived Kd for Lake Erie. The CoastColour algorithm was applied to MERIS satellite imagery to estimate Kd. The constant (0.2 m−1) and satellite-derived Kd values as well as radiation fluxes and meteorological station observations were then used to run FLake for a meteorological station on Lake Erie. Results improved compared to using the constant Kd value (0.2

APA, Harvard, Vancouver, ISO, and other styles

3

Kim, Do-Hyeon, and Jun-Yeop Lee. "Prediction of the Adsorption Behaviors of Radionuclides onto Bentonites Using a Machine Learning Method." Minerals 12, no. 10 (2022): 1207. http://dx.doi.org/10.3390/min12101207.

Full text

Abstract:

This study builds a model to predict distribution coefficients (Kd) using the random forest (RF) method and a machine learning model based on the Japan Atomic Energy Agency Sorption Database (JAEA-SDB). A database of ten input variables, including the distribution coefficient, pH, initial radionuclide concentrations, solid–liquid ratio, ionic strength, oxidation number, cation exchange capacity, surface area, electronegativity, and ionic radius, was constructed and used for the RF model calculation. The calculation parameters employed in this work included two different hyperparameters, the nu

APA, Harvard, Vancouver, ISO, and other styles

4

Estrada-Arriaga, E. B., and N. P. Mijaylova. "A comparison of biodegradation kinetic models applied to estrogen removal with nitrifying activated sludge." Water Science and Technology 62, no. 9 (2010): 2183–89. http://dx.doi.org/10.2166/wst.2010.441.

Full text

Abstract:

The biological degradation of estrone (E1), estradiol (E2) and ethinylestradiol (EE2) was studied in batch experiments at typical concentration levels using nitrifying activated sludge from a membrane bioreactor (MBR). Since first-order, pseudo first-order and Monod-type kinetics were observed. Pseudo first order kinetic was reformulated using only the soluble concentrations S and assuming adsorption coefficient KD of the estrogens. For the adsorption coefficients KD determination, activated sludge from MBR was spiked with the respective target compounds and stirred. Finally, the water was ana

APA, Harvard, Vancouver, ISO, and other styles

5

Castillo-Ramírez, Alejandra, Eduardo Santamaría-del-Ángel, Adriana González-Silvera, et al. "A New Algorithm to Estimate Diffuse Attenuation Coefficient from Secchi Disk Depth." Journal of Marine Science and Engineering 8, no. 8 (2020): 558. http://dx.doi.org/10.3390/jmse8080558.

Full text

Abstract:

The vertical diffuse attenuation coefficient Kd (PAR) is used for calculating the euphotic zone, the first optical depth that is important for primary productivity models. Currently, Kd (PAR) can be estimated using an irradiometer or a Secchi disk (SD). The main objective of this work is to define a model that can be applied to a wide range of optical marine conditions to estimate Kd (PAR) by SD. We used irradiance profiles and SD depth (ZSD) from 679 stations in various marine regions. Three parametric models were developed, and their statistical performance was evaluated in view of previous

APA, Harvard, Vancouver, ISO, and other styles

6

Pujianiki, Ni Nyoman, I. Made Aryatirta Predana, Alvin Yesaya, Komang Gede Putra Airlangga, Gde Rai Putra Arya Simpangan, and Muhammad Shazril Idris Bin Ibrahim. "Physical model analysis of stability coefficient for tetrapod innovation." Journal of Infrastructure, Policy and Development 8, no. 9 (2024): 8160. http://dx.doi.org/10.24294/jipd.v8i9.8160.

Full text

Abstract:

Beach protection is vital to reduce the damage to shorelines and coastal areas; one of the artificial protections that can be utilized is the tetrapod. However, much damage occurred when using a traditional tetrapod due to the lack of stability coefficient (KD). Therefore, this research aims to increase the stability coefficient by providing minor modifications to the cape of the tetrapod, such as round-caped or cube-caped. The modification seeks to hold the drag force from the wave and offer a good interlocking in between the tetrapod. This research applied physical model test research using

APA, Harvard, Vancouver, ISO, and other styles

7

Domingues, Rita B., and Ana B. Barbosa. "Evaluating Underwater Light Availability for Phytoplankton: Mean Light Intensity in the Mixed Layer versus Attenuation Coefficient." Water 15, no. 16 (2023): 2966. http://dx.doi.org/10.3390/w15162966.

Full text

Abstract:

The use of several light-related variables, such as the Secchi disc depth, the euphotic depth, and in particular, the diffuse attenuation coefficient (Kd), is deeply rooted in phytoplankton research, but these are not the most appropriate indicators of the amount of light available for photosynthesis. We argue that the variable of interest for phytoplankton is the mean light intensity in the mixed layer (Im), which represents the mean light to which phytoplankton cells are exposed throughout their life cycle, while being continuously mixed in the mixed layer. We use empirical data collected in

APA, Harvard, Vancouver, ISO, and other styles

8

Moiseev, S. I., A. I. Buyanovsky, A. N. Deminov, S. V. Klinushkin, and S. A. Moiseeva. "Application of the morphometric maturity coefficient to determine terminal molt in the crab Chionoecetes angulatus from the Okhotsk Sea." Trudy VNIRO 179 (October 26, 2020): 5–25. http://dx.doi.org/10.36038/2307-3497-2020-179-5-25.

Full text

Abstract:

Results of studies on the relationship between the claw morphometric parameters and the carapace width (CW) of the triangle crab (Chionoecetes angulatus) crab from the Sea of Okhotsk presented. For the operational screening and separation of males into morphometrically mature (ММ – large-clawed) and immature (MI – small-clawed) species, it is proposed to use the coefficient of morphometric maturity (K%). This coefficient can be defined as the ratio of claw height to carapace width (KH%) or as the ratio of claw diagonal to carapace width (KD%), expressed as a percentage. When assessing the coef

APA, Harvard, Vancouver, ISO, and other styles

9

Zhang, Yu, Zhantang Xu, Yuezhong Yang, et al. "Diurnal Variation of the Diffuse Attenuation Coefficient for Downwelling Irradiance at 490 nm in Coastal East China Sea." Remote Sensing 13, no. 9 (2021): 1676. http://dx.doi.org/10.3390/rs13091676.

Full text

Abstract:

The diurnal variation of the diffuse attenuation coefficient for downwelling irradiance at 490 nm (Kd(490)) has complex characteristics in the coastal regions. However, owing to the scarcity of in situ data, our knowledge on the diurnal variation is inadequate. In this study, an optical-buoy dataset was used to investigate the diurnal variation of Kd(490) in the coastal East China Sea, and to evaluate the Kd(490) L2 products of geostationary ocean color imager (GOCI), as well as the performance of six empirical algorithms for Kd(490) estimation in the Case-2 water. The results of validation sh

APA, Harvard, Vancouver, ISO, and other styles

10

Onyeocha, Veronica O., O. D. Akpan, Ikejiofor A. Onuchukwu, and Maduabuchi A. Chidiebere. "The Dimerization Effects of Some Solutes on the Partition Coefficient k_D in Binary Immiscible Solvents." International Letters of Chemistry, Physics and Astronomy 80 (December 2018): 40–52. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.80.40.

Full text

Abstract:

The dimerization of a solute dissolved in binary immiscible solvents shows that the value of the partition coefficient, kD of the solutes are influenced by the dimerization constant, K of the solute in one of the solvents according to the description: (C_X^A)/(C_X^B ) = kD + 2kD2KCxB where CxA and CxB are the concentrations of the solute x in the solvents A and B respectively. Both kD and K are parameters that predict the extent of beneficiation for most minerals. Also, kD is a fundamental parameter that determines the extent of solute recovery during solvent extraction. In this study, it is f

APA, Harvard, Vancouver, ISO, and other styles

11

Prasetyo, Budhi Agung, Vincentius Paulus Siregar, Syamsul Bahri Agus, and Wikanti Asriningrum. "IN-SITU MEASUREMENT OF DIFFUSE ATTENUATION COEFFICIENT AND ITS RELATIONSHIP WITH WATER CONSTITUENT AND DEPTH ESTIMATION OF SHALLOW WATERS BY REMOTE SENSING TECHNIQUE." International Journal of Remote Sensing and Earth Sciences (IJReSES) 14, no. 1 (2017): 47. http://dx.doi.org/10.30536/j.ijreses.2017.v14.a2682.

Full text

Abstract:

Diffuse attenuation coefficient, Kd(λ), has an empirical relationship with water depth, thus potentially to be used to estimate the depth of the water based on the light penetration in the water column. The aim of this research is to assess the relationship of diffuse attenuation coefficient with the water constituent and its relationship to estimate the depth of shallow waters of Air Island, Panggang Island and Karang Lebar lagoons and to compare the result of depth estimation from Kd model and derived from Landsat 8 imagery. The measurement of Kd(λ) was carried out using hyperspectral spectr

APA, Harvard, Vancouver, ISO, and other styles

12

Zeng, Qing Ling, Lu Wang, Chun Hua Shen, Fei Li, and Zhen Ming Zhou. "Adsorption Characteristics of Estrone to Aerobic Activated Sludge." Applied Mechanics and Materials 295-298 (February 2013): 12–16. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.12.

Full text

Abstract:

Batch experiments were conducted to measure the sorption capacities of estrone (E1) to aerobic activated sludge. The effect of temperature on E1 sorption was investigated at the temperatures of 5-35oC. The results showed that E1 sorption equilibrium was reached at 15min. E1 sorption on the sludge fitted both Freundlich and linear sorption isotherm models. Distribution coefficients (Kd) of E1 to aerobic inactivated sludge was 546.5 L∙kg-1 at 25oC. The effect of temperature on sorption indicated that lower temperature benefited the sorption. The distribution coefficients (Kd) and sorption rate b

APA, Harvard, Vancouver, ISO, and other styles

13

Kraus, Cleber Nunes, Daniel Andrade Maciel, Marie Paule Bonnet, and Evlyn Márcia Leão de Moraes Novo. "Phytoplankton Genera Structure Revealed from the Multispectral Vertical Diffuse Attenuation Coefficient." Remote Sensing 13, no. 20 (2021): 4114. http://dx.doi.org/10.3390/rs13204114.

Full text

Abstract:

The composition of phytoplankton and the concentration of pigments in their cells make their absorption and specific absorption coefficients key parameters for bio-optical modeling. This study investigated whether the multispectral vertical diffuse attenuation coefficient of downward irradiance (Kd) gradients could be a good framework for accessing phytoplankton genera. In situ measurements of remote sensing reflectance (Rrs), obtained in an Amazon Floodplain Lake (Lago Grande do Curuai), were used to invert Kd, focusing on Sentinel-3/Ocean and Land Color Instrument (OLCI) sensor bands. After

APA, Harvard, Vancouver, ISO, and other styles

14

Sedeño-Díaz, Jacinto Elías, Eugenia López-López, Erick Mendoza-Martínez, Alexis Joseph Rodríguez-Romero, and Sandra Soledad Morales-García. "Distribution Coefficient and Metal Pollution Index in Water and Sediments: Proposal of a New Index for Ecological Risk Assessment of Metals." Water 12, no. 1 (2019): 29. http://dx.doi.org/10.3390/w12010029.

Full text

Abstract:

The Lake of Texcoco is a closed basin with soils that confer salinity, conductivity, and alkalinity to it. It has undergone a reduction in size, incorporation of wastewater, and short-term desiccation, and includes temporary wetlands interconnected during the rainy season, some of which receive treated wastewater. Sediments contain metals, thus affecting water quality. Five artificial lakes were studied, and 12 metals (As, Ba, Cd, Cu, Cr, Fe, Mg, Mn, Hg, Ni, Pb, and Zn) were monitored bimonthly in water and sediments from June 2015 to March 2018. The Metal Pollution Index (MPI) and the Distrib

APA, Harvard, Vancouver, ISO, and other styles

15

Onyeocha, Veronica O., O. D. Akpan, Ikejiofor A. Onuchukwu, and Maduabuchi A. Chidiebere. "The Dimerization Effects of Some Solutes on the Partition Coefficient k<sub>D</sub> in Binary Immiscible Solvents." International Letters of Chemistry, Physics and Astronomy 80 (December 4, 2018): 40–52. http://dx.doi.org/10.56431/p-794j27.

Full text

Abstract:

The dimerization of a solute dissolved in binary immiscible solvents shows that the value of the partition coefficient, kD of the solutes are influenced by the dimerization constant, K of the solute in one of the solvents according to the description: (C_X^A)/(C_X^B ) = kD + 2kD2KCxB where CxA and CxB are the concentrations of the solute x in the solvents A and B respectively. Both kD and K are parameters that predict the extent of beneficiation for most minerals. Also, kD is a fundamental parameter that determines the extent of solute recovery during solvent extraction. In this study, it is f

APA, Harvard, Vancouver, ISO, and other styles

16

Decarreau, A., and S. Petit. "Fe3+/Al3+ partitioning between tetrahedral and octahedral sites in dioctahedral smectites." Clay Minerals 49, no. 5 (2014): 657–65. http://dx.doi.org/10.1180/claymin.2014.049.5.03.

Full text

Abstract:

AbstractThe distribution of Al3+ and Fe3+ between octahedral and tetrahedral sites of dioctahedral smectites was shown to be controlled by a partition coefficient Kd(4/6) = [(Fe3+)4×(Al3+)6]/[(Fe3+)6×(Al3+)4]. The Kd(4/6) value is near 0.006 for natural dioctahedral smectites, formed between 2 and ~100°C, and near 0.0174 for smectites synthesized at 200°C. These Kd(4/6) values, obtained from both chemical and spectroscopic data, were consistent with those calculated using the ionic radii of cations and Brice’s model (Brice, 1975). The partition coefficient approach explained well why for natur

APA, Harvard, Vancouver, ISO, and other styles

17

Alfeluo, Jmal Khlifa, Khaled S. Aljfairi, and Emsa lem F. .Hawege. "Biokinetic Coefficients Determination for the Biological Treatment of Langat River." مجلة الجامعة الأسمرية: العلوم التطبيقية 6, no. 2 (2021): 91–100. http://dx.doi.org/10.59743/aujas.v6i2.790.

Full text

Abstract:

River basin areas often associated with agriculture, industry and housing are the major source of pollution. This paper was conducted to determine biokinetic coefficients of pilot scale biofilm reactor. The biofilm reactor system (BRS) was installed on Langat River; Malaysia. The system was operated 65 days with different concentrations of mixed liquor suspended solid (MLSS), chemical oxygen demand (COD), and total suspended solids (TSS).Parameters in the influent and effluent of biofilm reactor were determined and biokinetic coefficients of maximum substrate utilization rate (K), half velocit

APA, Harvard, Vancouver, ISO, and other styles

18

Baborová, Lucie, Eva Viglašová, and Dušan Vopálka. "Comparison of Sr Transport in Compacted Homoionous Na and Ca Bentonite Using a Planar Source Method Evaluated at Ideal and Non-Ideal Boundary Condition." Water 13, no. 11 (2021): 1520. http://dx.doi.org/10.3390/w13111520.

Full text

Abstract:

With the aim to determine the influence of dominant interlayer cation on the sorption and diffusion properties of bentonite, diffusion experiments with Sr on the compacted homoionous Ca- and Na-forms of Czech natural Mg/Ca bentonite using the planar source method were performed. The bentonite was compacted to 1400 kg·m−3, and diffusion experiments lasted 1, 3 or 5 days. Two methods of apparent diffusion coefficient Da determination based on the analytical solution of diffusion equation for ideal boundary conditions in a linear form were compared and applied. The determined Da value for Ca-bent

APA, Harvard, Vancouver, ISO, and other styles

19

Schulien, Jennifer A., Tessa Code, Curtis DeGasperi, David A. Beauchamp, Arielle Tonus Ellis, and Arni H. Litt. "Annual and Interannual Variability in the Diffuse Attenuation Coefficient and Turbidity in Urbanized Washington Lake from 2013 to 2022 Assessed Using Landsat-8/9." Remote Sensing 15, no. 20 (2023): 5055. http://dx.doi.org/10.3390/rs15205055.

Full text

Abstract:

Water clarity, defined in this study using measurements of the downwelling diffuse light attenuation coefficient (Kd) and turbidity, is an important indicator of lake trophic status and ecosystem health. We used in-situ measurements to evaluate existing semi-analytical models for Kd and turbidity, developed a regional turbidity model based on spectral shape, and evaluated the spatial and temporal trends in Lake Washington from 2013 to 2022 using Landsat-8/9 Operational Land Imager (OLI). We found no significant trends from 2013 to 2022 in Kd or turbidity when both the annual and full datasets

APA, Harvard, Vancouver, ISO, and other styles

20

Dahm, Donald J., Kevin D. Dahm, and Karl H. Norris. "Obtaining Material Absorption Properties from Remission Spectra of Directly Illuminated, Layered Samples." Journal of Near Infrared Spectroscopy 10, no. 1 (2002): 1–13. http://dx.doi.org/10.1255/jnirs.316.

Full text

Abstract:

The effective linear absorption coefficient, K, obtained in transflection from directly illuminated samples made up of layers of thickness d, may be approximately related to the linear absorption coefficient, k, of the material making up the layers through the following empirical equations: k = [(1 – ½ exp(–2 Kd)] K and K = [(1 + exp(–4 kd)] k. The fractions of incident intensity absorbed or remitted by one layer may be modeled by assuming that that the light that moves through a sample has both the characteristics of directed and diffuse radiation.

APA, Harvard, Vancouver, ISO, and other styles

21

Zhang, Xianqing, Cai Li, Wen Zhou, et al. "Study of the Profile Distribution of the Diffuse Attenuation Coefficient and Secchi Disk Depth in the Northwestern South China Sea." Remote Sensing 15, no. 6 (2023): 1533. http://dx.doi.org/10.3390/rs15061533.

Full text

Abstract:

The diffuse attenuation coefficient for the downwelling irradiance Kdz,λ is a critical parameter in terms of the optical properties of the ocean. In the northwestern South China Sea, there are complex physical processes, and the accurate estimation of Kdz,λ in the northwestern South China Sea is critical for the study and application of the underwater light field and water constituents. In this study, using Hydrolight 6.0 (HL60) software, Kdz,λ was simulated based on the inherent optical properties (IOPs) and chlorophyll a concentration dataset in the northwestern South China Sea. The simulati

APA, Harvard, Vancouver, ISO, and other styles

22

Yang, Chaoyu, Haibin Ye, and Shilin Tang. "Seasonal Variability of Diffuse Attenuation Coefficient in the Pearl River Estuary from Long-Term Remote Sensing Imagery." Remote Sensing 12, no. 14 (2020): 2269. http://dx.doi.org/10.3390/rs12142269.

Full text

Abstract:

We evaluated six empirical and semianalytical models of the diffuse attenuation coefficient at 490 nm (Kd(490)) using an in situ dataset collected in the Pearl River estuary (PRE). A combined model with the most accurate performance (correlation coefficient, R2 = 0.92) was selected and applied for long-term estimation from 2003 to 2017. Physical and biological processes in the PRE over the 14-year period were investigated by applying satellite observations (MODIS/Aqua data) and season-reliant empirical orthogonal function analysis (S-EOF). In winter, the average Kd(490) was significantly highe

APA, Harvard, Vancouver, ISO, and other styles

23

Tiarasani, A., V. P. Siregar, and J. L. Gaol. "Estimation of diffuse coefficient attenuation (K_d 490) using sentinel 2A in Panggang Island and its Surrounding Water." IOP Conference Series: Earth and Environmental Science 1251, no. 1 (2023): 012029. http://dx.doi.org/10.1088/1755-1315/1251/1/012029.

Full text

Abstract:

Abstract In marine remote sensing areas, the intensity of the light that enters the water column will decrease exponentially with increasing depth due to scattering and absorption. The process of reducing intensity is called the attenuation process. This process became a limiting factor in detecting objects at the bottom and water column using a remote sensing method that depends on light intensity. Diffuse attenuation coefficient (Kd ) is an important optical property of seawater because it provides information on water clarity and the level of light attenuation. This research analyzed the Kd

APA, Harvard, Vancouver, ISO, and other styles

24

Kusakabe, Masashi, and Hyoe Takata. "Temporal trends of 137Cs concentration in seawaters and bottom sediments in coastal waters around Japan: implications for the Kd concept in the dynamic marine environment." Journal of Radioanalytical and Nuclear Chemistry 323, no. 1 (2019): 567–80. http://dx.doi.org/10.1007/s10967-019-06958-z.

Full text

Abstract:

AbstractRadioactivity concentrations of 137Cs in seawaters and bottom sediments have been measured in the coastal waters off all nuclear power plant sites in Japan. Sediment distribution coefficient (Kd) values obtained before the Fukushima Daiichi Nuclear Power Plant accident were variable and related to the specific surface area of the bottom sediment. A mathematical model suggested that before the accident the Kd values were in the transient state approaching a dynamic equilibrium with a converged Kd value of 1000–1600. Based on a post-accident mathematical model, the apparent Kd reached th

APA, Harvard, Vancouver, ISO, and other styles

25

Bailin, Cao, and Chen Huitang. "PD-Based Trajectory Tracking Control for Robot Manipulators." Journal of Dynamic Systems, Measurement, and Control 115, no. 3 (1993): 566–69. http://dx.doi.org/10.1115/1.2899140.

Full text

Abstract:

In this paper, it is proved that a trajectory tracking system of a manipulator is globally stable if the system is controlled under the decentralized PD control law plus a sliding term with a constant coefficient, and the norm of the coefficient matrix of its differential term is no less than that of the centripetal and Coriolis’ force term corresponding to the desired angular velocity, i.e., ∥Kd∥ ≥ ∥C(q, q˙d)∥. Condition ∥Kd∥ ≥ ∥C(q, q˙d)∥ implies that Kd increases only with q˙d instead of q˙. A type of globally asymptotically stable adaptive sliding mode PD-based control scheme is proposed,

APA, Harvard, Vancouver, ISO, and other styles

26

Oberlander, Tyler J., Bernadette L. Olson, and Lee Weidauer. "Test-Retest Reliability of the King-Devick Test in an Adolescent Population." Journal of Athletic Training 52, no. 5 (2017): 439–45. http://dx.doi.org/10.4085/1062-6050-52.2.12.

Full text

Abstract:

Context: The King-Devick (KD) test is a screening tool designed to assess cognitive visual impairments, namely saccadic rhythm, postconcussion. Test-retest reliability of the KD in a healthy adolescent population has not yet been established. Objective: To investigate the overall test-retest reliability of the KD among a sample of healthy adolescents. Additionally, we sought to determine if sex and age influenced reliability. Design: Cross-sectional study. Setting: Secondary school. Patients or Other Participants: Sixty-eight healthy adolescents, 41 boys (age = 15.4 ± 1.9 years) and 27 girls (

APA, Harvard, Vancouver, ISO, and other styles

27

Fakhruradzi, Sheikh, and A. Fitriadhy. "Optimization on fishing net porosity of twin pontoon floating breakwater in waves." Journal of Mechanical Engineering and Sciences 16, no. 1 (2022): 8801–10. http://dx.doi.org/10.15282/jmes.16.1.2022.12.0695.

Full text

Abstract:

Chaotic process in wave passing through pores on the attached fishing net between twin pontoons of floating breakwater (TPFB) may lead to several severe problems relating to the hydrodynamic performance of such coastal structure. In presence of relatively fine pores, the wave transmission coefficient (Kt) tends to diminish while the reflection coefficient (Kr) will likely increase, or vice versa for coarse ones. The circumstance requires a complete design optimization study into obtaining an optimum porosity. This paper presents optimization on the fishing net porosity (n) of TPFB using artifi

APA, Harvard, Vancouver, ISO, and other styles

28

Rippelová, Veronika, Lenka McGachy, Josef Janků, and Jiří Kroužek. "Estimating Tetrachloroethene Sorption Coefficients Based on Soil Properties in Organic-Poor Soils." Applied Sciences 14, no. 24 (2024): 11761. https://doi.org/10.3390/app142411761.

Full text

Abstract:

In the context of contaminated site remediation, the fate of chlorinated solvents in the subsurface and subsequent groundwater contamination is influenced by soil properties governing sorption. The solid–water distribution coefficient (Kd) is a key parameter for modeling contaminant distribution and transport, essential for risk assessment and remediation planning. This study evaluated tetrachloroethene sorption isotherms in 34 low-organic-carbon soils from the Czech Republic, assessing the influence of soil properties on Kd. Soil samples exhibited variability in organic carbon content (˂0.05–

APA, Harvard, Vancouver, ISO, and other styles

29

Corcoran, Forrest, and Christopher E. Parrish. "Diffuse Attenuation Coefficient (K_d) from ICESat-2 ATLAS Spaceborne Lidar Using Random-Forest Regression." Photogrammetric Engineering & Remote Sensing 87, no. 11 (2021): 831–40. http://dx.doi.org/10.14358/pers.21-00013r2.

Full text

Abstract:

This study investigates a new method for measuring water turbidity—specifically, the diffuse attenuation coefficient of downwelling irradiance Kd —using data from a spaceborne, green-wavelength lidar aboard the National Aeronautics and Space Administration's ICESat-2 satellite. The method enables us to fill nearshore data voids in existing Kd data sets and provides a more direct measurement approach than methods based on passive multispectral satellite imagery. Furthermore, in contrast to other lidar-based methods, it does not rely on extensive signal processing or the availability of the syst

APA, Harvard, Vancouver, ISO, and other styles

30

Ganf, GG, RL Oliver, and AE Walsby. "Optical properties of Gas-vacuolate cells and colonies of Microcystis in relation to light Attenuation in a Turbid, Stratified Reservoir (Mount Bold Reservoir, South Australia)." Marine and Freshwater Research 40, no. 6 (1989): 595. http://dx.doi.org/10.1071/mf9890595.

Full text

Abstract:

Profiles of downwelling and upwelling irradiance were measured in a stratified, turbid reservoir, when Microcystis aeruginosa formed a significant proportion of the phytoplankton community. The attenuation coefficient (Kd) was c. 2.1 m-1 and the reflectance (R) c. 0.03. Application of Kirk's simulation model relating apparent and inherent optical properties enabled calculation of coefficients of absorption (a; 1.3-1.6 m-') and scattering (6; 5-7 m-1). The asymptotic diffuse backscattering coefficient (0.2 m-1) was derived from the relationship b′b = 3.6 RaKd, a slight modification of Kirk's or

APA, Harvard, Vancouver, ISO, and other styles

31

Wakamori, M., Y. Ikemoto, and N. Akaike. "Effects of two volatile anesthetics and a volatile convulsant on the excitatory and inhibitory amino acid responses in dissociated CNS neurons of the rat." Journal of Neurophysiology 66, no. 6 (1991): 2014–21. http://dx.doi.org/10.1152/jn.1991.66.6.2014.

Full text

Abstract:

1. Effects of two volatile anesthetics [halothane (Hal) and enflurane (Enf)] and a volatile convulsant [hexafluorodiethyl ether (HFE)] on amino acid-induced membrane currents in neurons dissociated from the nucleus tractus solitarius of the rat were examined. The dissociated neurons were voltage clamped in the whole-cell mode of the patch-clamp technique. All drugs were applied with a microperfusion system, termed the "Y-tube" method. 2. The glutamate (Glu)-induced excitatory response was slightly reduced by both the anesthetics. The responses to three agonists at Glu receptor were depressed b

APA, Harvard, Vancouver, ISO, and other styles

32

Sonon, Leticia S., and A. Paul Schwab. "Adsorption Characteristics of Atrazine and Alachlor in Kansas Soils." Weed Science 43, no. 3 (1995): 461–66. http://dx.doi.org/10.1017/s0043174500081479.

Full text

Abstract:

The adsorption of atrazine and alachlor was studied on samples of three horizons from soils with different textures and organic carbon contents. Soils were equilibrated with five concentrations of atrazine and alachlor using batch techniques. Adsorption affinity for atrazine and alachlor was approximated by the Freundlich constant (Kf), distribution coefficient (Kd), and the normalizedKdbased on organic carbon (Koc). Adsorption was not significantly correlated with soil depth, clay content, or organic carbon. Atrazine adsorption was a linear function of equilibrium concentration for nearly all

APA, Harvard, Vancouver, ISO, and other styles

33

Cai, Rongyang, Miao Hu, Xiulin Geng, Mohammed Khalil Ibrahim, and Chunhui Wang. "Prediction of Diffuse Attenuation Coefficient Based on Informer: A Case Study of Hangzhou Bay and Beibu Gulf." Water 16, no. 9 (2024): 1279. http://dx.doi.org/10.3390/w16091279.

Full text

Abstract:

Marine water quality significantly impacts human livelihoods and production such as fisheries, aquaculture, and tourism. Satellite remote sensing facilitates the predictions of large-area marine water quality without the need for frequent field work and sampling. Prediction of diffuse attenuation coefficient (Kd), which describes the speed at which light decays as it travels through water, obtained from satellite-derived ocean color products can reflect the overall water quality trends. However, current models inadequately explore the complex nonlinear features of Kd, and there are difficultie

APA, Harvard, Vancouver, ISO, and other styles

34

Uthman, Qudus O., Davie M. Kadyampakeni, Peter Nkedi-Kizza, Samuel Kwakye, and Neriman Tuba Barlas. "Boron, Manganese, and Zinc Sorption and Leaf Uptake on Citrus Cultivated on a Sandy Soil." Plants 11, no. 5 (2022): 638. http://dx.doi.org/10.3390/plants11050638.

Full text

Abstract:

Solute fate in soil-plant continuum could either be soil or leaf uptake or leaching beyond the rooting zone. An adsorption coefficient (KD) is an important chemical property to describe the interaction between the solute and soil, affecting the solute movement in soils from one point to another. Boron (B), manganese (Mn), and zinc (Zn) uptake are evident in the leaves as a constituent of photosynthesis and other plant body-building mechanisms for growth and development. This study investigates the availability of micronutrients (B, Mn, and Zn) to citrus trees through modified application metho

APA, Harvard, Vancouver, ISO, and other styles

35

Yamaguchi, Tetsuji, Saki Ohira, Ko Hemmi, et al. "Consideration on modeling of Nb sorption onto clay minerals." Radiochimica Acta 108, no. 11 (2020): 873–77. http://dx.doi.org/10.1515/ract-2020-0006.

Full text

Abstract:

AbstractSorption distribution coefficient (Kd) of niobium-94 on minerals are an important parameter in safety assessment of intermediate-depth disposal of waste from core internals etc. The Kd of Nb on clay minerals in Ca(ClO4)2 solutions were, however, not successfully modeled in a previous study. The high distribution coefficients of Nb on illite in Ca(ClO4)2 solutions were successfully reproduced by taking Ca–Nb–OH surface species into account. Solubility of Nb was studied in Ca(ClO4)2 solutions and the results were reproduced by taking an aqueous Ca–Nb–OH complex species, CaNb(OH)6+, into

APA, Harvard, Vancouver, ISO, and other styles

36

Tiwari, S. P., and P. Shanmugam. "An optical model for deriving the spectral particulate backscattering coefficients in oceanic waters." Ocean Science 9, no. 6 (2013): 987–1001. http://dx.doi.org/10.5194/os-9-987-2013.

Full text

Abstract:

Abstract. An optical model is developed based on the diffuse attenuation coefficient (Kd) to estimate particulate backscattering coefficients bbp(λ) in oceanic waters. A large in situ data set is used to establish robust relationships between bbp(530) and bbp(555) and Kd(490) using an efficient nonlinear least-square method which uses the trust region algorithm with Bisquare weights scheme to adjust the coefficients. These relationships are obtained with good correlation coefficients (R2 = 0.786 and 0.790), low root mean square error (RMSE = 0.00076 and 0.00072) and 95% confidence bounds. The

APA, Harvard, Vancouver, ISO, and other styles

37

Tiwari, S. P., and P. Shanmugam. "An optical model for deriving the spectral particulate backscattering coefficients in clear and turbid coastal waters." Ocean Science Discussions 10, no. 1 (2013): 261–90. http://dx.doi.org/10.5194/osd-10-261-2013.

Full text

Abstract:

Abstract. An optical model is developed based on the diffuse attenuation coefficient (Kd) to estimate particulate backscattering coefficients bbp(λ) in clear and turbid coastal waters. A large in-situ data set is used to establish robust relationships between bbp(530) and bbp(555) and Kd(490) using an efficient nonlinear least square method which uses the Trust-Region algorithm with Bisquare weights scheme to adjust the coefficients. These relationships are obtained with good correlation coefficients (R2 = 0.786 and 0.790), low Root Mean Square Error (RMSE = 0.00076 and 0.00072) and 95% confid

APA, Harvard, Vancouver, ISO, and other styles

38

de Tello, Clédola C. O., Daisy M. M. dos Santos, and Thais B. Teixeira. "Study of the sorption and modelling of cesium by a Brazilian bentonite using PHREEQC." MRS Advances 5, no. 5-6 (2020): 245–52. http://dx.doi.org/10.1557/adv.2020.57.

Full text

Abstract:

ABSTRACTTo estimate the cesium sorption by the bentonite and to obtain the isotherms, some batch-adsorption experiments are being carried out, being the Kd (retardation coefficient) calculated from these isotherms. One-dimensional flow cell was constructed to measure the bentonite permeability regarding to a cesium solution, which results will be used to evaluate the diffusion coefficient – D. It will be used the PHREEQC software to model the transport of the cesium radionuclide through this bentonite with the Kd and D data. The modelling of radionuclide transport in the Brazilian materials wi

APA, Harvard, Vancouver, ISO, and other styles

39

Gouy, V., and R. Bélamie. "Using the Creams Pesticides Transfer Sub-Model at a Rainfall Simulation Scale." Water Science and Technology 28, no. 3-5 (1993): 679–83. http://dx.doi.org/10.2166/wst.1993.0473.

Full text

Abstract:

The pesticide sub-model of CREAMS was tested to describe pesticides transfer into runoff generated by a rainfall simulation. Adsorption coefficient, Kd, was found to be a sensitive parameter of the model. So, we developed an experimental method in order to measure Kd in a dynamic way. We studied four pesticides (atrazine, simazine, lindane, methidathion) and three soils (loam sand, sand loam, calcareous silt loam). The values of Kd obtained were compared to the values measured on the soils by the standardized method of batches and to the values of the literature. Mean Kd measured in the runoff

APA, Harvard, Vancouver, ISO, and other styles

40

Bédard, Jean H. "Parameterization of the Fe=Mg exchange coefficient (Kd) between clinopyroxene and silicate melts." Chemical Geology 274, no. 3-4 (2010): 169–76. http://dx.doi.org/10.1016/j.chemgeo.2010.04.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Ganetsos, G. "Prediction of the distribution coefficient (Kd) variation with operating conditions in chromatographic systems." Journal of Chromatography A 411 (January 1987): 81–94. http://dx.doi.org/10.1016/s0021-9673(00)93961-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Chiang, Yvonne, A. Jerry Kresge, Oleg Sadovski, Xiaofeng Zeng, and Yu Zhu. "Kinetics and mechanism of acid-catalyzed hydrolysis of the diazo functional groups of 1-diazo-2-indanone and 2-diazo-1-indanone in aqueous solution." Canadian Journal of Chemistry 83, no. 9 (2005): 1202–6. http://dx.doi.org/10.1139/v05-115.

Full text

Abstract:

Rates of hydrolysis of 1-diazo-2-indanone and 2-diazo-1-indanone were measured in dilute aqueous perchloric acid solutions using both H2O and D2O as the solvent, and rates of hydrolysis of the latter substrate were measured in dilute aqueous (H2O only) formic acid buffer solutions as well. The data for 1-diazo-2-indanone gave the hydronium ion catalytic coefficient kH+ = 5.7 × 103 (mol/L)1 s1 and the isotope effect kH+/kD+ = 2.9. The normal direction (kH/kD > 1) of this isotope effect was taken as evidence for a reaction mechanism involving rate-determining hydron transfer from the hydro

APA, Harvard, Vancouver, ISO, and other styles

43

Sánchez-Martín, Maria J., and Maria Sáanchez-Camazano. "Adsorption of Chloridazon by Soils and their Components." Weed Science 39, no. 3 (1991): 417–22. http://dx.doi.org/10.1017/s0043174500073161.

Full text

Abstract:

The effect of soil composition on adsorption of chloridazon by 18 samples of natural soils, with different chemical and textural characteristics, obtained from west-central Spain, was investigated. The effect of removal of organic matter on adsorption and adsorption of the herbicide by the active components of the soils (montmorillonite and humic acid) was also studied. A highly significant correlation was found between the distribution coefficient (Kd) and organic matter content when all the soils or the soils with organic matter content >2% were considered. According to the determination

APA, Harvard, Vancouver, ISO, and other styles

44

Setiawan, Budi, and Heni Suseno. "Study of Distribution Coefficient of 90Sr on Citumbuk Bentonite and Sukaramai Kaolinite." EKSPLORIUM 38, no. 1 (2017): 1. http://dx.doi.org/10.17146/eksplorium.2017.38.1.3056.

Full text

Abstract:

ABSTRACTThe study of distribution coefficient of strontium on bentonite and kaolinite samples, collected from Citumbuk, Bogor and Sukaramai, Padang, has been investigated under batch experiments. The sorption ratio was determined as a function of time, ionic strength and Sr concentration in the solution. The strontium wasextensively absorbed in the samples, with Kd values of 13,700 and 1,600 mL/g for bentonite and kaolinite samples respectively. The other results showed that ionic strength of the solution and initial concentration of Sr have given an effect to 90Sr sorption onto samples. ABSTR

APA, Harvard, Vancouver, ISO, and other styles

45

Mosavi, Dehmordi Laleh, Ahmad Savari, A. Dostshenas, Asgari H. Mohamad, and Alireza Abasi. "Assessment of Chlorophyll-A, SST and Diffuse Attenuation Coefficient (Kd490) in Northwest of Persian Gulf using Landsat 8 Satellite Data." International Journal of Sciences Volume 5, no. 2016-05 (2016): 10–26. https://doi.org/10.5281/zenodo.3349187.

Full text

Abstract:

The objective of this research was to develop a model for estimating chlorophyll-a, SST and kd(490) on the Northwest Persian gulf water using relatively high resolution landsat8 image. A field compaign were conducted in Feb, March, April, May, July, Agust, Oct and Nov of 2014 concurrent to satellite over-pass. The field work were conducted of Mahshar estuary between Feb, 14th to Nov, 13th, 2014. Temperature, Secchi disk depth, chl-a, kd and zeu was measured in this study. We tested various regression models using combinations of bands. The regression models showed acceptable correlation and ac

APA, Harvard, Vancouver, ISO, and other styles

46

Nababan, B., D. Ulfah, and J. P. Panjaitan. "Light propagation, coefficient attenuation, and the depth of one optical depth in different water types." IOP Conference Series: Earth and Environmental Science 944, no. 1 (2021): 012047. http://dx.doi.org/10.1088/1755-1315/944/1/012047.

Full text

Abstract:

Abstract The ocean color satellite can only sense a water column up to one optical depth. However, literatur regarding the depth of one optical depth is very limited to none. This study aimed to determine light propagation, attenuation coefficient (Kd), and the depth of one optical depth in different water types. We used in situ data of downwelling irradiance (Ed) with depths taken using the instrument of submersible marine environmental radiometer (MER) in the northeastern gulf of mexico (NEGOM) in April 2000. We also used SeaWiFS data such as water leaving radience (Lw ), remote sensing refe

APA, Harvard, Vancouver, ISO, and other styles

47

Kumar, Anil, and Avinash Thakur. "Statistical Optimization of Lactic Acid Extraction Using Green Solvent and Mixed Extractants (TOA and TOMAC)." Chemical Engineering Research Bulletin 21, no. 1 (2020): 20–35. http://dx.doi.org/10.3329/cerb.v21i1.47369.

Full text

Abstract:

Since some previous years, reactive extraction has become more attractive and competitive technique for the separation and purification of lower carboxylic acids from fermentation broth as well as from dilute aqueous streams. This paper shows the results of investigation of reactive extraction of lactic acid (LA) from an aqueous solution using the synergistic mixture of the extractants (TOA (tri-n-octylamine) and TOMAC (Tri-n-octylmethylammonium chloride)) and a non-toxic and biocompatible green solvent (soybean oil). Three-level Box-Behnken design (BBD) under response surface methodology (RSM

APA, Harvard, Vancouver, ISO, and other styles

48

Cheng, Chien Chuan, Re Ching Lin, Wei Tsai Chang, Ying Chung Chen, Kuo Sheng Kao, and Chung Jen Chung. "Electromechanical Coupling Coefficient of SAW on Proton-Exchanged and Annealed LiNbO₃ Waveguides." Advanced Materials Research 311-313 (August 2011): 1957–60. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1957.

Full text

Abstract:

We had investigated the electromechanical coupling coefficient (K2) of surface acoustic wave (SAW) on proton-exchanged (PE) and annealed PE (APE) z-cut LiNbO3 waveguides using octanoic acid. The penetration depth of hydrogen assumed to be equal to the waveguide depth (d) was measured by secondary-ion mass spectrometry (SIMS). The frequency response of SAW was measured with a network analyzer. The annealing process was carried out in a horizontal furnace kept at 400°C for 2 h under a dry O2 gas flow. The change of K2 in PE and APE samples fabricated under different conditions was dependent on k

APA, Harvard, Vancouver, ISO, and other styles

49

Pedroso Curtarelli, Victor, Cláudio Clemente Faria Barbosa, Daniel Andrade Maciel, et al. "Diffuse Attenuation of Clear Water Tropical Reservoir: A Remote Sensing Semi-Analytical Approach." Remote Sensing 12, no. 17 (2020): 2828. http://dx.doi.org/10.3390/rs12172828.

Full text

Abstract:

The diffuse attenuation coefficient of downwelling irradiance (Kd) is an essential parameter for inland waters research by remotely sensing the water transparency. Lately, Kd semi-analytical algorithms substituted the empirical algorithms widely employed. The purpose of this research was to reparametrize a semi-analytical algorithm to estimate Kd and then apply it to a Sentinel-2 MSI time-series (2017–2019) for the Três Marias reservoir, Brazil. The results for the Kd semi-analytical reparametrization achieved good accuracies, reaching mean absolute percentage errors (MAPE) for bands B2, B3 an

APA, Harvard, Vancouver, ISO, and other styles

50

Campbell, L. S., A. Chimedtsogzol, and A. Dyer. "Species sensitivity of zeolite minerals for uptake of mercury solutes." Mineralogical Magazine 70, no. 4 (2006): 361–71. http://dx.doi.org/10.1180/0026461067040341.

Full text

Abstract:

AbstractThe uptake of inorganic Hg2+ and organometallic CH3Hg+ from aqueous solutions by 11 different natural zeolites has been investigated using a batch distribution coefficient (Kd) method and supported by a preliminary voltammetric study. The effect of mercury concentration on the Kd response is shown over an environmentally appropriate concentration range of 0.1–5 ppm inorganic and organometallic Hg using a batch factor of 100 ml g-1 and 20 h equilibration. Analcime and a Na-chabazite displayed the greatest methylmercury uptakes (Kd values at 1.5 ppm of 4023 and 3456, respectively), with

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!