The Effect of flashing in reducing the tonal range of a transparency for photomechanical reproduction

Photographic processing and lithographic printing reproduction are two different processes. In photography, the transparency reproduces the original scene in continuous tone. Whereas, in lithographic printing, the reproduction is a result of an all-or-nothing process. A transparency may have a tonal range that exceeds the range that can be reproduced in lithographic printing. So tone compression is performed on transparencies that exceed the tonal range for printing. Avoiding tone compression during lithographic production results in considerable savings in cost and time. One of the methods to reduce tonal range is for the photographer to understand the relationship between emulsion flashing and the tonal range of transparencies. Flashing is the process of projecting nonimage white light to the film emulsion either before or after exposure, but prior to processing. This study investigated the relationship between flashing and exposure for a transparency which would reduce its tonal range and make it suitable for printing. The hypotheses under investigation were: (1) it is possible to flash Ektachrome transparency film by a predetermined amount of light to produce a desired reduction in the tonal range of a transparency, making it more acceptable to the printing range of lithographic printing when using coated paper; (2) the post-flashing technique produces the most acceptable result in achieving the desired tonal range as compared to the pre-flashing technique; (3) the flashing technique produces the same result in a transparency as the image prepared by the use of adjusting the lighting ratio in measured photography. An experimental investigation was conducted. A setup consisting of standard scales was photographed at various exposures and different degrees of flashing. The photography was performed using a 4X5 camera. The setup was illuminated at 45 angles by means of two strobe lights. Exposure was controlled by altering the aperture opening of the lens or fstop. The degree of flashing was determined by pre-exposing or post-exposing the Ektachrome transparency film emulsion to non-image white light through sheets of parchment paper placed at a distance of three inches from the camera lens. The amount of light that could reach the lens during flashing was controlled by varying the number of sheets of parchment paper. Thirty-two transparencies were photographed. The transparencies were processed by E-6 process. The tonal ranges of the transparencies were measured by means of a transmission densitometer. A visual test was conducted to determine the visual appeal of the transparencies by professionals in the field of photography and printing. The outcome of the experimental investigation showed that the tonal range of a transparency is reduced when the film emulsion is flashed. The results suggest that preflashing by an amount of a little over one-third of the light required for normal exposure and then exposing the film to the subject or setup at one and a half stop below the normal exposure produces transparencies that have a tonal range within the limits of lithographic printing and that are visually appealing. It was also shown that pre-flashing the film had a greater effect on reducing the tonal range than post-flashing. Moreover, the flashing technique was compared with methods used to reduce the tonal range by adjusting the lighting ratio. Based on these results, the first hypothesis was confirmed, the second was rejected, and the third was qualitatively accepte

Natriuretic peptide receptors regulate cytoprotective effects in a human ex vivo 3D/bioreactor model

© 2013 Peake et al.; licensee BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

The Case Against Stock in Public Pension Funds

A government has $1 million of stock in a pension fund that covers its employees. The liability can be matched with a$1-million dedicated bond portfolio. What are the consequences of shifting the pension fund from equities to bonds? The paragraph above duplicates the opening paragraph of The Case Against Stock in Corporate Pension Funds (Bader 2003), except that we have substituted a governmental plan for a corporate plan. Does this substitution matter

Corporate governance and voluntary disclosure in Kuwait

“A thesis submitted to the University of Bedfordshire, in partial fulfilment of the requirements for the degree of Doctor of Philosophy”.Failure of high profile companies such as Enron, World.com had initiated a call for an investigation to analyse the reason for such radical consequence to prevent further similar financial crises. One of the common factors identified by the researchers is the poor disclosure, transparency and Corporate Governance (CG) mechanisms. Similar to the UK, the compliance towards CG codes are voluntary for the majority of the countries around the globe including Kuwait. CG codes aimed to improve the governance of a company including transparency. Thus, voluntary disclosure had been examined by numerous academics to emphasise the importance of accountability, transparency that in turn increase the confidence of investors and creditors in the financial markets of emerging economies. This thesis is based on Kuwait, as it is a resource rich country and attracts foreign investments. The Central Bank of Kuwait (CBK) issued instructions for CG mechanism especially to the financial sector in 2004. From the research in hand, there was no longitudinal study in Kuwait concerning the impact of GC mechanism to voluntary disclosure. The sample in this thesis consists of 155 Kuwaiti listed companies from 2007 to 2010, 620 firm-year observations. A self-constructed index was developed to evaluate the level of voluntary disclosure and how it developed over time. Both univariate analysis and multivariate analysis were used. Most of the thesis results were consistent with previous studies; there was a gradual increase in the level of voluntary disclosure and its categories over the observed period. All CG mechanisms findings revealed significant associations with voluntary disclosure, except board size and role duality, have a negative significant association. Ownership structure indicates insignificant association with voluntary disclosure. Firm characteristics have a significant positive association with voluntary disclosure, except profitability, has a significant negative association, while gearing is found an insignificant association. Furthermore, the level of voluntary disclosure in the financial sector is higher than the non-financial sector. The contributions to knowledge in this thesis are; 1) It is the first empirical longitudinal study in Kuwait concerning voluntary disclosure, and its relationship with GC mechanism, ownership structure and firm characteristics, as far as the researcher is aware. 2) It provided evidence of the importance of CG to enhancing the level of voluntary disclosure in Kuwait business environment, especially that the level of voluntary disclosure in the financial sector is higher than the non-financial sector. 3) Employed many quantitative methods, such as OSL regression, Normal score, GLS regression, Tobit regression and Quantile regression (divided into 25%, 50% and 75%). 4) A self-constructed index, which was developed in this thesis, could be suitable for other Arab Gulf countries that are similar in the business environment and experiencing the same economic changes. 5) Provides evidence of the possibility of employing the disclosure theories derived from developed countries in emerging countries. 6) It is possible to generalise the results of the disclosure index to other companies not investigated in this thesis. Moreover, this thesis implies that the legislative and regulatory authorities, in particular, the capital markets authority Kuwaiti, need to increase efforts to enhance the role of corporate governance practices in Kuwaiti listed companie

A fixed point theorem for L 1 spaces

We prove a fixed point theorem for a family of Banach spaces including notably L 1 and its non-commutative analogues. Several applications are given, e.g. the optimal solution to the "derivation problem” studied since the 1960

RNA-Seq optimization with eQTL gold standards.

BackgroundRNA-Sequencing (RNA-Seq) experiments have been optimized for library preparation, mapping, and gene expression estimation. These methods, however, have revealed weaknesses in the next stages of analysis of differential expression, with results sensitive to systematic sample stratification or, in more extreme cases, to outliers. Further, a method to assess normalization and adjustment measures imposed on the data is lacking.ResultsTo address these issues, we utilize previously published eQTLs as a novel gold standard at the center of a framework that integrates DNA genotypes and RNA-Seq data to optimize analysis and aid in the understanding of genetic variation and gene expression. After detecting sample contamination and sequencing outliers in RNA-Seq data, a set of previously published brain eQTLs was used to determine if sample outlier removal was appropriate. Improved replication of known eQTLs supported removal of these samples in downstream analyses. eQTL replication was further employed to assess normalization methods, covariate inclusion, and gene annotation. This method was validated in an independent RNA-Seq blood data set from the GTEx project and a tissue-appropriate set of eQTLs. eQTL replication in both data sets highlights the necessity of accounting for unknown covariates in RNA-Seq data analysis.ConclusionAs each RNA-Seq experiment is unique with its own experiment-specific limitations, we offer an easily-implementable method that uses the replication of known eQTLs to guide each step in one's data analysis pipeline. In the two data sets presented herein, we highlight not only the necessity of careful outlier detection but also the need to account for unknown covariates in RNA-Seq experiments

Other‐Sacrificing Options

I argue that you can be permitted to discount the interests of your adversaries even though doing so would be impartially suboptimal. This means that, in addition to the kinds of moral options that the literature traditionally recognises, there exist what I call other-sacrificing options. I explore the idea that you cannot discount the interests of your adversaries as much as you can favour the interests of your intimates; if this is correct, then there is an asymmetry between negative partiality toward your adversaries and positive partiality toward your intimates

Kinetic Energy Density Study of Some Representative Semilocal Kinetic Energy Functionals

There is a number of explicit kinetic energy density functionals for non-interacting electron systems that are obtained in terms of the electron density and its derivatives. These semilocal functionals have been widely used in the literature. In this work we present a comparative study of the kinetic energy density of these semilocal functionals, stressing the importance of the local behavior to assess the quality of the functionals. We propose a quality factor that measures the local differences between the usual orbital-based kinetic energy density distributions and the approximated ones, allowing to ensure if the good results obtained for the total kinetic energies with these semilocal functionals are due to their correct local performance or to error cancellations. We have also included contributions coming from the laplacian of the electron density to work with an infinite set of kinetic energy densities. For all the functionals but one we have found that their success in the evaluation of the total kinetic energy are due to global error cancellations, whereas the local behavior of their kinetic energy density becomes worse than that corresponding to the Thomas-Fermi functional.Comment: 12 pages, 3 figure

Polarization forces in water deduced from single molecule data

Intermolecular polarization interactions in water are determined using a minimal atomic multipole model constructed with distributed polarizabilities. Hydrogen bonding and other properties of water-water interactions are reproduced to fine detail by only three multipoles $\mu_H$, $\mu_O$, and $\theta_O$ and two polarizabilities $\alpha_O$ and $\alpha_H$, which characterize a single water molecule and are deduced from single molecule data.Comment: 4 revtex pages, 3 embedded color PS figure

Electronic reconstruction at SrMnO3-LaMnO3 superlattice interfaces

We use resonant soft x-ray scattering to study electronic reconstruction at the interface between the Mott insulator LaMnO3 and the "band" insulator SrMnO3. Superlattices of these two insulators were shown previously to have both ferromagnetism and metallic tendencies [Koida et al., Phys. Rev. B 66, 144418 (2002)]. By studying a judiciously chosen superlattice reflection we show that the interface density of states exhibits a pronounced peak at the Fermi level, similar to that predicted by Okamoto et al. [Phys. Rev. B 70, 241104(R) (2004)]. The intensity of this peak correlates with the conductivity and magnetization, suggesting it is the driver of metallic behavior. Our study demonstrates a general strategy for using RSXS to probe the electronic properties of heterostructure interfaces.Comment: 4.2 pages, 4 figure