Multiple rooks of chess - a generic integral field unit deployment technique

A new field re-configuration technique, Multiple Rooks of Chess (MRC), for multiple deployable Integral Field Spectrographs has been developed. The method involves mechanical geometry as well as an optimized deployment algorithm. The geometry is found to be simple for mechanical implementation. The algorithm initially assigns the IFUs to the target objects and then devises the movement sequence based on the current and the desired IFU positions. The reconfiguration time using the suitable actuators which runs at 20 cm/s is found to be a maximum of 25 seconds for the circular DOTIFS focal plane (180 mm diameter). The Geometry Algorithm Combination (GAC) has been tested on several million mock target configurations with object-to-IFU ({\tau} ) ratio varying from 0.25 to 16. The MRC method is found to-be efficient in target acquisition in terms of field revisit and deployment time without any collision or entanglement of the fiber bundles. The efficiency of the technique does not get affected by the increase in number density of target objects. The technique is compared with other available methods based on sky coverage, flexibility and overhead time. The proposed geometry and algorithm combination is found to have an advantage in all of the aspects.Comment: 18 Pages, 13 Figures, 1 Tabl

Prefrontal cortex haemodynamics and affective responses during exercise: a multi-channel near infrared spectroscopy study

The dose-response effects of the intensity of exercise upon the potential regulation (through top-down processes) of affective (pleasure-displeasure) responses in the prefrontal cortex during an incremental exercise protocol have not been explored. This study examined the functional capacity of the prefrontal cortex (reflected by haemodynamics using near infrared spectroscopy) and affective responses during exercise at different intensities. Participants completed an incremental cycling exercise test to exhaustion. Changes (Δ) in oxygenation (O2Hb), deoxygenation (HHb), blood volume (tHb) and haemoglobin difference (HbDiff) were measured from bilateral dorsal and ventral prefrontal areas. Affective responses were measured every minute during exercise. Data were extracted at intensities standardised to: below ventilatory threshold, at ventilatory threshold, respiratory compensation point and the end of exercise. During exercise at intensities from ventilatory threshold to respiratory compensation point, ΔO2Hb, ΔHbDiff and ΔtHb were greater in mostly ventral than dorsal regions. From the respiratory compensation point to the end of exercise, ΔO2Hb remained stable and ΔHbDiff declined in dorsal regions. As the intensity increased above the ventilatory threshold, inverse associations between affective responses and oxygenation in (a) all regions of the left hemisphere and (b) lateral (dorsal and ventral) regions followed by the midline (ventral) region in the right hemisphere were observed. Differential activation patterns occur within the prefrontal cortex and are associated with affective responses during cycling exercise

Benevolence, integrity and ability: a survey of Italian SMEs and banks

Access to appropriate finance is crucial for the start-up, survival, growth and development of firms. The majority of entrepreneurs, especially in smaller firms, are reliant on the bank system. Previous research examines relationships between firms and banks from a transaction costs economics and/or agency theory point of view. This postulates an opportunistic base to human behaviour. An alternative set of assumptions about human nature encompass altruism and trust. Trust is relevant because it is a way to reduce complexity; it is the 'lubricant' in exchanges; it is crucial in situations of risk or high pressure, and it is among the building blocks of social capital, which have been shown to underpin access to resources for entrepreneurs. Trust is based on an assessment of ability, benevolence and integrity. This paper tests whether there is a relationship between trust and the cost of finance (i.e. interest rates)

Analysis of Sample Correlations for Monte Carlo Rendering

Modern physically based rendering techniques critically depend on approximating integrals of high dimensional functions representing radiant light energy. Monte Carlo based integrators are the choice for complex scenes and effects. These integrators work by sampling the integrand at sample point locations. The distribution of these sample points determines convergence rates and noise in the final renderings. The characteristics of such distributions can be uniquely represented in terms of correlations of sampling point locations. Hence, it is essential to study these correlations to understand and adapt sample distributions for low error in integral approximation. In this work, we aim at providing a comprehensive and accessible overview of the techniques developed over the last decades to analyze such correlations, relate them to error in integrators, and understand when and how to use existing sampling algorithms for effective rendering workflows.publishe

Incentives for the adoption of e-government by Greek municipalities

Purpose: The research aims to identify the incentives that play an important role in the evolution of e-government in Greece at local scale and its actual development level. It also investigates the factors and the perceived barriers that affect the development of local egovernment in Greek Municipalities, as well as the benefits they derive from it. Design/Methodology/Approach: The research is based on a survey that was conducted through a questionnaire to all 325 Municipalities of the country and includes data from 109 Municipalities that participated in the quantitative approach. Findings: While e-government is spread at a relatively satisfactory level, it appears that only a few Municipalities are performing well. Results highlight also the two main incentives that motivate Municipalities to adopt e-government: The first is the improvement of the efficiency of information exchange with the external environment and the second is managing internal issues-relationships in conjunction with the existence of prominent IT departments. Amongst the main factors that affect e-government adoption by Local authorities, budgetary constraints stand out, while the lack of personnel specialized in Information Technologies is identified as common obstacle. Practical Implications: Findings suggest that an integrated approach to e-government is needed in order to enable organizations to minimize failures and to overcome barriers and counter risks. The capacity to align e-government applications with the increasing and evolving needs and requirements of the citizens is the key to optimizing the benefits of eGovernment at local scale. Originality/Value: There is no similar empirical research in the context of Greece; hence, it seems important to increase the knowledge about the drivers of e-government adoption, especially in the public sector at the local scale.peer-reviewe

Sediment budget and source in the catchment of the River Rother, West Sussex

The purpose of the study was to undertake a quantitative assessment of the proportions of river sediment derived from the various rock types within the catchment.b) to determine the rate of removal of sediment from the catchment.The former purpose involved the determination of the mineralogy of source rocks, soils, alluvium and sediment by X.R.D. and heavy mineral analysis. The data indicate that each source rock has a characteristic mineralogy, but that this is not sufficiently variable for a quantitative assessment of proportions of sediment from each source rock to be determined. Certain conclusions, however, are drawn from the data, including a tentative formation, by sorting on a basis of specific gravity, of heavy mineral assemblage zones in channel sediment, that are probably indicative of areas of aggradation and degradation.To determine the rate of sediment loss from the catchment, the dissolved load, the suspended load and thebed load were investigated. The dissolved load includes Ca2+ and HCO3 formed from the solution of Chalk, anderosion rates of CaCO3 have been estimated at approximately 39.8 tonnes/km. 2/year.Suspended sediment concentrations were determined for samples collected from a variety of stations during a variety of flow conditions. An estimated 2,182 tonnes of suspended sediment was lost from the catchment in 1972 , of which 1,720 tonnes was non-organic. The data indicate that the frequency and duration of storm events is a major controlling factor for suspended sediment concentration. Pates of bed load movement were determined using fluorescent sand tracers for two stretches of the Pother and a relationship between grain size, river discharge and sediment loss is presented for each. Modifications of techniques and methodology for use of fluorescent tracers are suggested and the data indicate the probability of aggradation of sizes of medium sand and larger between the two experimental stretches.<p

Non-elective caesarean sections in the Khomas Region, Namibia: implications for midwifery practice

Includes bibliographical references.Women who undergo caesarean section (CS) are likely to have a repeat CS in a subsequent pregnancy, thus increasing the CS rate in the country, which is not ideal in a resource constrained setting. The occurrence of high maternal mortality among women who have nonelective CS is usually due to indications for prior CS such as fetal distress, obstructed labour and eclampsia. In developing countries, there is a high rate of maternal deaths associated with major operative complications. This study was a retrospective, descriptive quantitative, clinical audit. The purpose was to identify the reasons for non-elective CS in two hospitals namely, the Windhoek Central hospital and Intermediate Katutura hospital, and the implications for Midwifery clinical practice. The research question was: What are the indications and intrapartum care factors for non-elective CS in the two hospitals, and what are the implications for Midwifery practice? The population consisted of records of women who had given birth by CS between 1st January 2012 and 30th June 2012 in the two hospitals. All available records of women who had non-elective CS during the study period were reviewed. Data was collected with individual data collection sheets and analysed using Statistica 11 software. A total of 838 records were reviewed. The CS rate was 1264/5296 (23.9%), the rate of nonelective CSs was 912/5296 (17.2%), and the proportion of non-elective CS was 912/1264 (72.2%). A total of 171/838 (20.4%) women were HIV positive. Seventy per cent (634/838) women had a CS for the first time, of which 290/634 (45.7%) were multigravida. Records were grouped according to Robson’s classification, a mutually exclusive and totally inclusive classification of CS. The Robson group making the largest contribution was nulliparous women with a single cephalic pregnancy, at greater than or equal to 37 weeks gestation in spontaneous labour (group 1) with 213/838=25.4%. Problems with the progress of labour were the most common reason why women had non-elective CSs during the study period. The study findings highlighted a high number of primary CS in low risk women with poor assessment of maternal wellbeing and progress of labour. Limited documentation of Midwifery intervention and care was noted suggesting inadequate Midwifery care. Training is required to render evidence based care

End-to-end Sampling Patterns

Sample patterns have many uses in Computer Graphics, ranging from procedural object placement over Monte Carlo image synthesis to non-photorealistic depiction. Their properties such as discrepancy, spectra, anisotropy, or progressiveness have been analyzed extensively. However, designing methods to produce sampling patterns with certain properties can require substantial hand-crafting effort, both in coding, mathematical derivation and compute time. In particular, there is no systematic way to derive the best sampling algorithm for a specific end-task. Tackling this issue, we suggest another level of abstraction: a toolkit to end-to-end optimize over all sampling methods to find the one producing user-prescribed properties such as discrepancy or a spectrum that best fit the end-task. A user simply implements the forward losses and the sampling method is found automatically -- without coding or mathematical derivation -- by making use of back-propagation abilities of modern deep learning frameworks. While this optimization takes long, at deployment time the sampling method is quick to execute as iterated unstructured non-linear filtering using radial basis functions (RBFs) to represent high-dimensional kernels. Several important previous methods are special cases of this approach, which we compare to previous work and demonstrate its usefulness in several typical Computer Graphics applications. Finally, we propose sampling patterns with properties not shown before, such as high-dimensional blue noise with projective properties