165 research outputs found
Reevaluating the perception of Space:Is Space Truly Black or colorless?
No full textThis research explores a fundamental question in astrophysics: Is space truly black, or does it only appear so due to the absence of light? Challenging the conventional view that space is inherently black, the author proposes that space is actually colorless, and the perception of blackness is a result of the lack of light particles reaching the observer’s eye. The paper evaluates the nature of natural light, including that from stars and the Sun, and argues that no natural source emits black as part of its spectrum. This independent research is authored by Sivakumar, an original thinker based in India, and aims to stimulate deeper inquiry into cosmic perception, light behavior, and the limitations of human visual understanding in interpreting space
Reevaluating the perception of Space:Is Space Truly Black or Colorless?
No full textThis research explores a fundamental question in astrophysics: Is space truly black, or does it only appear so due to the absence of light? Challenging the conventional view that space is inherently black, the author proposes that space is actually colorless, and the perception of blackness is a result of the lack of light particles reaching the observer’s eye. The paper evaluates the nature of natural light, including that from stars and the Sun, and argues that no natural source emits black as part of its spectrum. This independent research is authored by Sivakumar, an original thinker based in India, and aims to stimulate deeper inquiry into cosmic perception, light behavior, and the limitations of human visual understanding in interpreting space. The paper has been submitted to OSF to ensure transparent sharing, open feedback, and archival of this work for the scientific community
Diaphragmatic crural eventration
No full textAim: We evaluated patients with gastric volvulus secondary to diaphragmatic pathology. Materials and Methods: Eight patients (5 males and 3 females) presented to the author in a tertiary care center during 1997-2006 were analyzed in terms of age, sex, symptomatology, diagnosis and predisposing factors. Observations: Six had an acute presentation and rest had chronic symptomatology. The two patients who had total gangrene stomach died postoperatively and one patient died preoperatively due to aspiration. All the cases presented with acute symptoms had diaphragmatic pathology, and out of these, three cases had the specific entity, which is named as diaphragmatic crural eventration. Conclusions: Diaphragmatic crural eventration is characterized by the defective development of the right crus of diaphragm, and this is embryologically significant as the right crus and ligaments of the stomach develop from dorsal mesoesophagus and mesogastrium. The author recommends a closer look for this defect of diaphragm while operating a case of gastric volvulus
The Effects of Information And Communication Technology In Hungarian Economic Sectors
No full textAs the author could not find a reassuring mathematical and statistical method in the literature for studying the effect of information communication technology on enterprises, the author suggested a new research and analysis method that he also used to study the Hungarian economic sectors. After a
brief introduction to the theoretical background of the Information Age, the author examines the question of what factors have an effect on their net income is essential for enterprises. First, the potential indicators related to economic sectors were studied, then the author compared those indicators to the net income of the surveyed enterprises. The data resulting from the comparison showed that the growing
penetration of electronic marketplaces contributed to the change of the net income of enterprises in various economic sectors. Among all the potential indicators, only the indicator of electronic marketplaces has a direct influence on the net income of enterprises. It was practical to determine two clusters based on the potential indicators
The impact of climatic variability over the period 1961- 1990 on the soil water balance of upland soils in the North East Arid Zone of Nigeria
No full textOver the period 1961 – 90 the North East Arid Zone of Nigeria experienced a decline
in annual rainfall totals and increased aridity which placed increasing pressure on
rain fed, millet-based farming systems. The changes in seasonal rainfall total and
distribution have been examined and it has been shown that the rate of decline has
been consistent across the region. The decline has been dominated by reduction in
the number of rain days during the middle of the rainy season and there is no
evidence of a significant change in the length of the growing season. Over the same
time period, there has been a small, but significant, increase in mean air temperature
which has resulted in a small increase in potential evapotranspiration. Other climatic
parameters (vapour pressure, solar radiation and wind speed) appear to have
remained stable, although the paucity and dubious quality of much of the historical
meteorological data make rigorous statistical analysis difficult.
A water balance model (BALANCE) developed by the author, was calibrated for a
millet crop grown on a typical sandy loam soil in Maiduguri (Nigeria). The model
was necessarily parsimonious, but was shown to perform well when calibrated
against observed soil water content. However, the empirical nature and high
sensitivity of key parameters relating to bare soil evaporation and drainage mean that
it is difficult to parameterise the model by laboratory, or independent field
measurements.
Applying the calibrated model to daily rainfall and average evapotranspiration data
from Nguru (Nigeria) for the period 1961 – 93 showed that, with the exception of
extreme drought years, the increased aridity would have had little impact on the
viability of traditional millet and millet-cowpea intercropping systems prior to the
early 1980s. However, after that date, predicted seasonal millet transpiration, and
hence predicted yields, have declined, and long duration cowpea intercrops, which
were traditionally matured on residual soil moisture after the millet harvest have had
insufficient water.
Whilst the BALANCE model has been useful in examining the impact of climatic
variability on agro-hydrology, it is not a crop physiological model and the interaction
between soil water and crop development is poorly represented. The model cannot, therefore be applied with confidence to investigate the potential yield benefits of
physical or agronomic interventions to alleviate the impacts of aridity. Although
more complex models exist to do this, they require detailed parameterisation of the
crop physiology, which was not possible within the scope of this study
Modeling and analysis of manufacturing system to improve cycle time and utilization performance
No full textThis project aims to study the manufacturing system through modeling and analysis.
It is about searching for different ways and solutions in order to improve the cycle
time and utilization of a production. The project is built upon on the previous IA
experienced by the author in the Shanghai Venture cooperation. All the issues faced
during the internship period will serve as an actual case study of the production
environment which enables the author to utilize this knowledge to solve some of the
problems concerned.
The author will delve deeply into the physics of the manufacturing system by
conducting research studies at the collaborating company (Singapore Venture
cooperation), reviewing precedents or prior work assignments and also doing
literature review to determine how different factors will affect the manufacturing
system in various aspects such as throughput, cycle time, utilization, etc. In addition,
the author will be using a simulation program to simulate the proposed solution in
order to understand the pros and cons of it before implementing it on the production
line. Thus, by analyzing the scenarios in whole and diagnosing the issues that
occurred, the author is able to propose some practical and economical solutions for
the problems that arise in the duration of this project.Bachelor of Engineering (Mechanical Engineering
Alteration of Antioxidative Metabolism Induced by Triazoles in Sweet Potato
No full textThe triazole induced changes of antioxidants such as ascorbic acid, α-tocopherol, riboflavin, anthocyanin, and xanthophylls and the activities of antioxidant enzymes like ascorbate peroxidase, superoxide dismutase and catalase in Ipomoea batatas L. during initiation and maturation of storage roots were studied in field experiments. Each plant was treated with one liter of aqueous solution containing 20 mg L-1 triadimefon and 15 mg L-1 hexaconazole on 40, 55 and 70 days after planting (DAP). The treatments were given by soil drenching. The plants were harvested on 45, 60, 75, 90 and 105 DAP and used for analyzing antioxidant contents and antioxidant enzyme activities. It was found that these triazole compounds increase the contents of ascorbic acid, α-tocopherol, riboflavin, anthocyanin, and xanthophylls and activities of ascorbate peroxidase, superoxide dismutase, and catalase activities at 105 DAP. Triadimefon and hexaconazole treatments increased the antioxidation status in all parts of plants when compared to the control. --------------------------------------------------------------------------------------------------------Stress Physiology Lab, Department of Botany, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India* Corresponding Author, Email: [email protected], Tel: +914144 238248 x354; fax: +914144 222265 Please Cite This Article As: T. Sivakumar, G. M. A. Lakshmanan, P. V. Murali and R. Panneerselvam. 2010. Alteration of Antioxidative Metabolism Induced by Triazoles in Sweet Potato. J. Exp. Sci. 1(3): 10-13.Â
New insights into the failure mechanisms of horizontal plate anchors in clay during pull-out
No full textOffshore wind developments are moving towards deep-water regions where energy is abundant, visual impact is minimised and the larger turbine sizes can make the energy production more cost-effective. One of the key challenges facing the industry is the development of reliable substructures. While fixed foundation systems are widely used for shallow-water (<60 m) developments, permanent anchors are seen as one of the most viable mooring solutions for floating structures in deep water. In the current study, the pull-out behaviour of square plate anchors in clay was investigated using large-displacement finite-element analysis. The anchor capacity and failure mechanism were considered for a range of embedment ratios and undrained shear strengths. Three distinct modes of anchor failure identified in previous studies were examined through the analysis of four descriptors including: the pull-out capacity of the anchor, the pull-out displacement required to mobilise this capacity, the energy absorbed by the anchor during pull-out and the variation of the pull-out capacity with respect to a normalised overburden pressure. The findings of the study are presented in the form of a series of charts that can aid design through understanding of the factors controlling the development of anchor failure modes, in addition to identifying the transition point between different failure mechanisms.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Geo-engineerin
Dynamic matrix controller design for performance study of an interacting coupled tank MIMO process
No full textMicro repeating structure using etching and repeating silica crystal structure growth to improve LED light extraction efficiency
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