124,175 research outputs found
kshitij-v-mehta/SC20-NVMe-Paper-Artifacts: Artifacts for the SC20 Paper
No full textAll artifacts created for the Supercomputing 2020 paper "Co-design Evaluation of HPC I/O Middleware forMulti-Tier Storage Architectures
Stereochemical reassignment of Mehta and Kundu's spiculoic acid a analogue.
No full textA close examination of Mehta and Kundu's synthesis of an analogue of spiculoic acid A revealed discrepancies between their proposed structure and corresponding data. A revised structure is proposed for Mehta and Kundu's analogue after a careful analysis of their key synthetic transformations and published data. [reaction: see text]
Nonlinear properties of silicon core optical fibres
No full textSilica optical fibres are renowned for the framework they have set in modern communications systems, sensors, and biotechnology. One particular trend in current research aims to investigate materials with enhanced optical functionality, high optical efficiency, robustness, and a small device footprint. Amongst the many material choices, semiconductors are emerging as a promising route. In this work, optical fibres and semiconductors are elegantly unified to create a hybrid structure with the potential of seamless integration into current fibre infrastructures. Silica capillaries form the fibre templates in which amorphous semiconductor materials such as silicon and/or germanium are impregnated. This thesis will present the first comprehensive description of the fabrication, characterisation, and the implementation of silicon optical fibres for all-optical signal processing. The fibres are fabricated via a novel high pressure chemical deposition procedure. Each fibre is analysed to determine the exact material composition, uniformity, and more importantly the optical quality. Linear and nonlinear optical characterisations are performed experimentally and supported by intensive numerical studies to validate the results.The high nonlinearity of silicon is exploited for all-optical signal processing. Several investigations have been performed to determine key nonlinear coefficients that were previously unknown in these fibres. Nonlinear absorption experiments allowed for the determination of the degenerate and non-degenerate two-photon absorption coefficients, free carrier cross sections, and free carrier lifetimes of a number of silicon fibres. Nonlinear refraction investigations were then used to establish the Kerr nonlinearity. The strength of this parameter allowed for demonstration of strong self-phase and cross-phase modulation effects. With the insight gained in nonlinear absorption and refraction in silicon optical fibres, all-optical amplitude modulation and wavelength switching was demonstrated at ultrafast sub-picosecond speeds
Active semiconductor fibers and devices
No full textUnary and compound semiconductors have been deposited into microstructured optical fibers to make junction-based fiber devices, very high power infrared fibers, mid-infrared fiber lasers, and nonlinear hydrogenated amorphous silicon fibers
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
A Clinical Study on the outcome of Mehta valve implant.
No full textINTRODUCTION:
Glaucoma drainage devices are important tools in the management
of Refractory glaucomas. It was introduced by Molteno in 1969 to treat
Refractory glaucomas. They were referred to as Setons previously
because solid structures with shaft such as threads, wires or hairs were
placed in the wound to form a patent drainage fistula. AIM OF THE STUDY: To measure the outcome of Mehta valve implant in 25 cases (26
eyes) of intractable glaucoma inserted using a modified surgical
technique that eliminates the need for a donor scleral graft.
The main outcomes included
1. Analysis of intraocular pressure control following surgery &
comparison with the preoperative baseline IOP.
2. Frequency of intraoperative and postoperative complications.
3. Success rate of the procedure at a follow up of 6months, 1year, 18
Months & 2 years.
INCLUSION CRITERIA
Patients between the ages of 30-70 yrs were taken. One patient
alone was in the paediatric age group.
Patients with Glaucoma uncontrolled on maximum tolerated
medical therapy & were considered at high risk of failure for
trabeculectomy or had previously failed trabeculectomy were taken.
MATERIALS AND METHODS: A total of 26 eyes of 25 patients diagnosed as refractory Glaucoma attending the Glaucoma service of GOH between August 2006 & October 2008 were enrolled in this study.
RESULTS: Mehta valve implantation was done in 26 eyes of 25 patients
during the 2 year study period between September 2006 & October 2008.
The male to female ratio was 2:1 & the mean age was 48.06(range
10-64 yrs).
The mean pre-operative IOP was 37.4mmHg.
CONCLUSION: In terms of IOP control Mehta implant was found to be good in
patients with uncontrolled complicated glaucoma cases. The fall in IOP
was sustained over the period of follow up.
It is a valved implant & hence it prevents post operative hypotony
by providing resistance to the flow & therefore regulating the pressure
within the desired range.
All cases were done without patch graft & tube was secured in the
intra scleral tunnel.
In conclusion, Mehta valve implant is a simple & an effective
device & it could be a good treatment option in intractable glaucomas.
Nevertheless longer follow up is necessary to examine the long term
course of the success rate
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Artificial Neural Network Algorithms to Predict Resting Energy Expenditure in Critically Ill Children
No full textIntroduction: Accurate assessment of resting energy expenditure (REE) can guide optimal nutritional prescription in critically ill children. Indirect calorimetry (IC) is the gold standard for REE measurement, but its use is limited. Alternatively, REE estimates by predictive equations/formulae are often inaccurate. Recently, predicting REE with artificial neural networks (ANN) was found to be accurate in healthy children. We aimed to investigate the role of ANN in predicting REE in critically ill children and to compare the accuracy with common equations/formulae. Study methods: We enrolled 257 critically ill children. Nutritional status/vital signs/biochemical values were recorded. We used IC to measure REE. Commonly employed equations/formulae and the VCO2-based Mehta equation were estimated. ANN analysis to predict REE was conducted, employing the TWIST system. Results: ANN considered demographic/anthropometric data to model REE. The predictive model was good (accuracy 75.6%; R2 = 0.71) but not better than Talbot tables for weight. After adding vital signs/biochemical values, the model became superior to all equations/formulae (accuracy 82.3%, R2 = 0.80) and comparable to the Mehta equation. Including IC-measured VCO2 increased the accuracy to 89.6%, superior to the Mehta equation. Conclusions: We described the accuracy of REE prediction using models that include demographic/anthropometric/clinical/metabolic variables. ANN may represent a reliable option for REE estimation, overcoming the inaccuracies of traditional predictive equations/formulae
prevalence of forward head posture in mobile gamers in comparison to xbox gamers among young adults
No full textText neck or "scholar's neck" is the term used to describe forward head posture. Numerous variables, including protracted use of computers and mobile devices, contribute to FHP. To check the prevalence of FHP in mobile gamers in comparison to xbox gamers among young adults. An observational study. A total of 100 gamers took part in this study of age ranging between 18 to 30 years out of which 52 were mobile gamers and rest 48 are xbox gamers. The posture of neck and craniovertebral angle was measured in this study. According to the findings, mobile gamers had a far lower prevalence of FHP than Xbox gamers. This suggests that Xbox users have a forward-leaning posture compared to Mobile users. Young people who play on Xbox have much more FHP than those who play on mobile. This might be because people play video games on smaller gadgets that are held closer to their faces
- …
