scholarly journals The human photopic ERG luminance-response function: Analysis, interpretation and application

2002 ◽  
Vol 2 (10) ◽  
pp. 86-86
Author(s):  
P. Lachapelle ◽  
M. Rufiange ◽  
J. Brule ◽  
J. Racine ◽  
M. Dumont ◽  
...  
Keyword(s):  
Response Function ◽  
Function Analysis ◽  
Photopic Erg

Sensitivity with respect to observations in variational data assimilation

2017 ◽  
Vol 32 (1) ◽  
Author(s):  
Victor Shutyaev ◽  
Francois-Xavier Le Dimet ◽  
Elena Shubina
Keyword(s):  
Data Assimilation ◽  
Response Function ◽  
Nonlinear Evolution ◽  
Function Analysis ◽  
Optimal Solution ◽  
Coupled System ◽  
Variational Data Assimilation ◽  
Adjoint Equations ◽  
Observation Data ◽  
Standard Problem

AbstractThe problem of variational data assimilation for a nonlinear evolution model is formulated as an optimal control problem to find the initial condition function (analysis). The observation data, and hence the optimal solution, may contain uncertainties. A response function is considered as a functional of the optimal solution after assimilation. Based on the second-order adjoint techniques, the sensitivity of the response function to the observation data is studied. The gradient of the response function is related to the solution of a non-standard problem involving the coupled system of direct and adjoint equations. The solvability of the non-standard problem is studied, based on the Hessian of the original cost function. An algorithm to compute the gradient of the response function with respect to observations is developed and justified.

scholarly journals Spatial localization in nuclear spin-induced circular dichroism – a quadratic response function analysis

2019 ◽  
Vol 21 (33) ◽  
pp. 18082-18091 ◽  
Author(s):  
Petr Štěpánek ◽  
Sonia Coriani
Keyword(s):  
Circular Dichroism ◽  
Excited States ◽  
Response Function ◽  
Nuclear Spin ◽  
Function Analysis ◽  
Spatial Localization ◽  
Computational Method ◽  
Induced Circular Dichroism ◽  
Quadratic Response ◽  
Circular Dichroïsm

A new computational method for nuclear spin-induced circular dichroism allows analysis of localization of individual excited states within a molecule.

scholarly journals A Study On The Productivity Of Koreas Industrial Sector With IT Technology Capital And R&D Stocks Variation

2011 ◽  
Vol 1 (10) ◽  
Author(s):  
Chuhwan Park ◽  
Tae-Woong Park ◽  
Byoung-Moo Heo
Keyword(s):  
Time Series ◽  
Granger Causality ◽  
Impulse Response ◽  
Response Function ◽  
Function Analysis ◽  
Impulse Response Function ◽  
Industrial Sector ◽  
Response Analysis ◽  
Industrial Growth ◽  
Time Periods

This paper examines the effects of IT technology capital and R&D stocks variation on the growth of Koreas industries with time series approaches. In detail, we analyze the Granger causality and impulse response analysis among the Koreas industrial growth, IT technology capital, and R&D stocks. When it comes to this research conclusion, we know that IT technology capital and R&D stocks shocks affect the growth of Koreas industrial sector. However, the revere effect is ambiguous in each industrial sector. Also, the impulse response function analysis shows that the effect of IT technology capital and R&D stocks fluctuation in each industrial sector is presented with different time periods.

scholarly journals First Dendroclimatological Insight into Austrian Pine (Pinus nigra Arnold) Climate-Growth Relationship in Belgrade Area, Serbia

2020 ◽  
Vol 11 (2) ◽  
pp. 127-134
Author(s):  
Branko Stajić ◽  
Marko Kazimirović ◽  
Vojislav Dukić ◽  
Nenad Radaković
Keyword(s):  
Correlation Analysis ◽  
Tree Ring ◽  
Response Function ◽  
Positive Impact ◽  
Function Analysis ◽  
Pearson Correlation ◽  
Ring Width ◽  
Growth Data ◽  
The Impact ◽  
Precipitation And Temperature

In order to assess the impact of climate variations on Austrian pine forest in the Belgrade area, the radial growth of artificially-established Austrian pine trees and its dependence on temperature and precipitation was studied using dendroclimatological methods. The site is classified as Quercetum-frainetto cerris Rudski. Standard and residual chronologies were established and several common statistics were calculated. A dendroclimatic study was carried out using the correlation and response function analysis. The Pearson correlation coefficients between the chronology indices and 13 seasonal (3-month period) precipitation and temperature data were calculated for the period from 1959 to 2014. The applied response function analysis included 24 precipitation and temperature variables from October of the prior year to September of the current year. The results of the correlation analysis pointed out that there was a strong tendency towards a positive response to the summer and late summer/early autumn precipitation and a weak significant negative response to the spring and summer temperatures. Climate-growth relationships were further first studied using the response functions for the significant seasons that were detected from the correlation analysis and then for individual months from previous October to current September. These results also highlighted the findings that higher precipitation in the current summer months has a beneficial effect on the tree-ring width. The conducted correlation between the residual chronology and the Standardised Precipitation Evapotranspiration Index indicated that a high summer value of this drought index had a positive impact on the pine growth and reinforced the previously detected relevance of September as an important month for the Austrian pine growth. These preliminary results point out that some additional climate-Austrian pine growth studies (application of various tree-ring features, growth data with a much longer time span, more sites/stands, etc.) should be performed to obtain new and valuable knowledge important for the sustainable management of Austrian pine forests.

Weed Response, Yield, and Economics of Hexazinone and Nitrogen use in Lowbush Blueberry Production

Weed Science ◽  
1986 ◽  
Vol 34 (5) ◽  
pp. 723-729 ◽  
Author(s):  
David E. Yarborough ◽  
John J. Hanchar ◽  
Steven P. Skinner ◽  
Amr A. Ismail
Keyword(s):  
Response Function ◽  
Field Experiments ◽  
Function Analysis ◽  
Block Design ◽  
Growth And Yield ◽  
Net Income ◽  
Partial Budgeting ◽  
Lowbush Blueberry ◽  
Plant Stand ◽  
Effect On Yield

Field experiments designed to determine the efficacy and interaction of hexazinone [(3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione] and nitrogen on weeds and lowbush blueberry [Vaccinium angustifolium (Ait.)] growth and yield were established at five locations in 1980 and 13 locations in 1981. Hexazinone was applied after pruning, preemergence with nitrogen, using a split-block design, with locations serving as replications. Grasses, goldenrod (Solidago spp.), and meadowsweet [Spiraea latifolia (Ait.) Borkh. # SPVLF] were reduced significantly as the rate of hexazinone was increased. Blueberry injury, plant stand, number of flower buds, and yield all increased with increases in hexazinone rate. Variations in blueberry yields occurred among locations due to differences in plant stand and productivity, as well as climatic and edaphic factors. Within each nitrogen rate, increases in the rate of hexazinone resulted in a quadratic increase in blueberry yield. Within the hexazinone treatments, increasing nitrogen had no effect on yield. Blueberry yield reached a maximum of 3926 kg/ha at a hexazinone rate of 1.83 kg/ha. Partial budgeting was used to evaluate the effect of combinations of hexazinone and nitrogen on net income. Response function analysis determined yield and profit-maximizing combinations of hexazinone and nitrogen. Partial budgeting indicated that hexazinone alone or combined with nitrogen increased net income, but nitrogen without hexazinone decreased net income. Response function analysis indicated that hexazinone at 1.79 kg/ha without nitrogen maximized profits.

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