154 research outputs found
Data for: Molecular characterisation of a novel pathogenic avipoxvirus from the Australian magpie (Gymnorhina tibicen)
No full textThere were multiple Next-Generation Sequencing data sets that were used to assemble and analysed this novel avipoxvirus genome. We have uploaded two data sets, however, other raw sequence datasets that support the findings of this study are available from the corresponding author on reasonable request
High-performance gallium nitride power devices with efficient edge termination structures compliant with plasma-assisted molecular-beam epitaxy based silicon nitride shadowed selective-area growth technique
No full textThe objective of this research is the design and development of ultra-low-leakage mixed-conduction gallium nitride (GaN) diodes with reverse blocking voltage approaching parallel-plane behavior. Although GaN is a promising wide bandgap (WBG) material, experimentally reported GaN power devices result in large leakage currents with lower reverse blocking efficiency. Two major de ciencies result in crippling underperformance in GaN power devices. First, conventional GaN processing methodologies, such as, ion-implantation and inductively-coupled plasma reactive-ion etching (ICP-RIE) etching, introduce lattice damage and defects, causing large leakage current components. Second, inefficient edge termination (ET) designs are incapable of reaching ideal parallel-plane breakdown voltage. This work aims to overcome the aforementioned problems in GaN power devices through innovative designs compatible with a selective-area processing (SAP) technique avoiding both ICP-RIE and ion-implantation. To alleviate the shortcomings in GaN power device ET schemes, novel ET schemes capable of providing ideal parallel-plane breakdown are developed and presented. Also, these designs are fully compliant with the ultra-low-leakage silicon nitride shadowed selective-area growth (SNS-SAG) GaN processing technique. This plasma-assisted molecular-beam epitaxy (PAMBE) based GaN SAP technique is capable of reducing leakage by at least four orders of magnitude compared to ICP-RIE etching. Additionally, mixed-conduction diodes, such as, buried p-base merged p-i-n Schottky (BP-MPS) and buried p-base merged p-i-n junction barrier controlled Schottky (BP-MPJ) diodes capable of reducing leakage current by about five orders of magnitude compared to corresponding p-islet MPS (PI-MPS) diode designs, have been developed. In conjunction with novel ET designs developed in this work and SNS-SAG processing methodology, these high-performance mixed-conduction diodes perfectly fit in the role of snubber diodes in high-speed switching power applications.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-05-01The student, Palash Sarker, accepted the attached license on 2021-04-07 at 17:04.The student, Palash Sarker, submitted this Dissertation for approval on 2021-04-07 at 17:07.This Dissertation was approved for publication on 2021-04-08 at 15:35.DSpace SAF Submission Ingestion Package generated from Vireo submission #16250 on 2021-09-16 at 20:08:11Made available in DSpace on 2021-09-17T04:04:08Z (GMT). No. of bitstreams: 2
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Previous issue date: 2021-04-08Embargo set by: Seth Robbins for item 118641
Lift date: 2023-09-17T04:04:53Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 118641
Lift date: 2023-09-17T04:07:01Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemAuthor requested closed access (OA after 2yrs) in Vireo ETD systemLimite
Simulation of Traffic Flow Model with Traffic Controller Boundary
No full textThis paper considers a fluid dynamic traffic flow model appended with a closure linear velocity-density relationship which provides a first order hyperbolic partial differential equation (PDE) and is treated as an initial boundary value problem (IBVP). We consider the boundary value in such a way that one side of highway treat like there is a traffic controller at that point. We present the analytic solution of the traffic flow model as a Cauchy problem. A numerical simulation of the traffic flow model (IBVP) is performed based on a finite difference scheme for the model with two sided boundary conditions and a suitable numerical scheme for this is the Lax-Friedrichs scheme. Solution figure from our scheme indicates a desired result that amplitude and frequency of cars density and velocity reduces as time grows. Also at traffic controller point, velocity and density values change as desired manner. In further, we also want to introduce anisotropic behavior of cars(to get more realistic picture) which has not been considered here.
Doi: 10.12777/ijse.5.1.25-30
[How to cite this article: Sultana, N., Parvin, M. , Sarker, R., Andallah, L.S. (2013). Simulation of Traffic Flow Model with Traffic Controller Boundary. International Journal of Science and Engineering, 5(1),25-30. Doi: 10.12777/ijse.5.1.25-30
FIG. 5 in A New Genus and Two New Species of Arboreal Toads from the Highlands of Sumatra with a Phylogeny of Sundaland Toad Genera
No full textFIG. 5.—Habitat of Sigalegalephrŋnus mandailinguensis—a view of the rainforest at the edge of an inactive solphatara field on the northeastern slope of Gunung Sorikmarapi where the holotype was found (upper); and first author at the entrance of the subterranean hollow where the holotype was collected (lower).Published as part of Smart, Utpal, Sarker, Goutam C., Arifin, Umilaela, Harvey, Michael B., Sidik, Irvan, Hamidy, Amir, Kurniawan, Nia & Smith, Eric N., 2017, Herpetologica 73 (1) on pages 63-75, DOI: 10.1655/Herpetologica-D-16-00041, http://zenodo.org/record/771643
Performance evaluation of aloe vera-based edible coating on cucumber through kinetics study and machine vision
No full textAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD system"Cucumber is a popular vegetable with a relatively short shelf life. To extend its shelf-life, edible coatings such as Aloe vera individually or in combination with other ingredients comprise a promising treatment for retaining the postharvest quality of fruits and vegetables. However, the performance of treatment in reducing the degradation rate of a quality parameter should be determined quantitatively; therefore, a kinetics study that involves the study of chemical reaction rates and mechanisms is essential. In addition, measuring a quality parameter, such as color, often follows a destructive technique, which is time-consuming and costly.
The objective of this study was to identify the optimum concentration of Aloe vera-based coating and to study its effect on the shelf-life and degradation kinetics of fresh and minimally processed cucumber during storage, as well as to assess the suitability of a machine vision system as a non-destructive tool for continuous monitoring of cucumber for its quality changes.
The first part of the study assessed the efficacy and performance of Aloe vera (AV) gel-glycerol edible coating to extend the shelf life of minimally processed cucumber. To assess the optimal coating formulation, four concentrations (0, 30, 50, and 100% [v/v]) were tested on cucumber slices stored at 4 ± 1C and at 20 ± 1C. Slices coated with 50% and 100% AV had reduced physicochemical changes and suppressed microbial loads while maintaining overall visual quality (visual appearance) during storage. During the kinetics study, zero and first-order kinetic models fitted well to the experimental data of L*, a*, and b* color parameters with sufficiently high coefficients of determination (R2) values. In addition, the kinetic rate constants of color changes were found to be temperature dependent as described by the Arrhenius equation that is used to reveal the relation between chemical reactions and temperature. Overall, throughout the kinetics study, lower color degradation rates were observed in Aloe-vera coated slices compared to control slices.
In the second part of the study, fresh cucumbers were coated with Aloe vera (AV) gel and Carboxymethyl Cellulose (CMC). Control, 20%, 30%, and 50% (V/V) AV + 1% (W/V) CMC coating formulations were prepared and applied on cucumbers stored at 15°C and 23°C. Quality parameters such as weight, firmness, color, pH, total soluble solids (TSS), titratable acidity (TA), and mold count were monitored at regular intervals until day 20. The degradation kinetics of stored cucumbers, namely weight loss, firmness and color changes, and the effect of coating treatment on the degradation kinetics were studied by fitting kinetic models to the specified experimental data. Both zero and first-order kinetic models fitted well with weight loss, firmness, and color change data with a reasonably high coefficient of determination (R2) values. The Arrhenius equation was used to study the effect of temperature on the kinetic parameters, and . Temperature increment, in general, resulted in the acceleration of the degradation process. From the kinetics study, 30% AV + 1% CMC coating had the most reduced degradation rate among the treatments studied. Overall, based on the interactive effects of coating treatment, temperature, and storage time, 30% AV + 1% CMC coated cucumbers retained the most postharvest quality parameters.
In the third part of the study, a machine vision system was used to monitor cucumbers' external quality, such as color changes or the presence of any damage during storage. Images of cucumber were acquired in a ""soft box,"" which provided a highly diffuse lighting scene, ideal for observing visual changes in the skin of cucumber. A cucumber center pixel accumulation (CCPA) algorithm was used to select center pixels from grayscale images. All the center pixels from 400 images (each obtained by 0.9° rotation) were accumulated to obtain an image of 1280*400-pixel size, which corresponds to a whole cucumber surface. This original RGB image was used to monitor the external changes of stored cucumbers by extracting the color and texture (local binary pattern) features. Damage progression plots (DPP) were made from accumulated grayscale images. For the absolute differential damage progression (ADDP) plot, the blue (B) channel in RGB color space was found to be the best in terms of interpreting the damage progression from the plot and the corresponding 3-D histograms. In addition, the k-means clustering technique was applied for defect segmentation from the RGB image. In this experiment, images were taken as input RGB images which were transformed into L*,a*,b* and HSV spaces. The color space that was the most sensitive overall, i.e., could capture most of the information about the day-to-day color changes of cucumber, was identified through a principal component analysis (PCA). According to the PCA, all individual components in the RGB color space were found to be suitable to obtain information about the external changes of cucumber. Overall, the machine vision approach was found suited as a non-destructive technique for monitoring the external quality of cucumber during storage.
"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-05-01The student, Ayesha Sarker, accepted the attached license on 2021-04-15 at 11:51.The student, Ayesha Sarker, submitted this Dissertation for approval on 2021-04-15 at 12:11.This Dissertation was approved for publication on 2021-04-21 at 14:24.DSpace SAF Submission Ingestion Package generated from Vireo submission #16348 on 2021-09-16 at 17:03:17Made available in DSpace on 2021-09-17T02:34:31Z (GMT). No. of bitstreams: 2
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LICENSE.txt: 4210 bytes, checksum: c5630a5402e10963796ad3e20a10699d (MD5)
Previous issue date: 2021-04-21Embargo set by: Seth Robbins for item 118520
Lift date: 2023-09-17T02:34:57Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Onl
Uterine Perforation & Abortion- A Case Report
No full textSreemoti Ratna Sarker 30 years old lady presented to us with the complaints of amenorrhea for 5 months, lower abdominal pain for 5 days, slight per vaginal bleeding for 2-3 days, a cord like structure is coming down p/v on the day of admission. On general examination she was stable and on p/v examination there was cord prolapse. A gentle traction was given and it was expelled out along with a small piece of placental tissue without any fetal parts and bleeding. Then she was advised for USG of abdomen. USG reported a fetus like structure in the abdominal cavity and the empty uterine cavity . She was managed surgically. Now she is doing well.KYAMC Journal Vol. 5, No.-1, Jul 2014, Page 491-493</jats:p
Theoretical effect of concentration, circulation rate, stages, pressure and temperature of single amine and amine mixture solvents on gas sweetening performance
No full textAbstractThis simulation experiment performed by Aspen Hysys is about theoretical investigation of gas sweetening performance of single amine solvents MEA1, MDEA2, DEA3, DGA4, DIPA5 and mixed amine solvents DGA–MEA, DEA–MDEA and SULFOLANE6–MDEA. Sweet gas having very high percentage of methane is produced by MEA (95.36%), DGA–MEA (95.37%), DEA–MDEA (95.51%) and SULFOLANE–MDEA (95.10%) and DGA (93.76%) shows lowest performance. DGA, SULFOLANE–MDEA, MDEA remove H2S at a lower circulation rate and DEA, DIPA need higher but satisfactory circulation rate. Increasing stage number shows positive effect on DEA, DIPA and SULFOLANE–MDEA. Pressure change has no significant effect. Temperature increase and methane percentage are negatively correlated for all solvents (except low circulating DIPA). With temperature increase H2S composition increases for DEA–MDEA, DGA–MEA; CO2 increases for DEA–MDEA, DGA–MEA and high circulating SULFOLANE–MDEA
New Insights into the Bacterial Fitness-Associated Mechanisms Revealed by the Characterization of Large Plasmids of an Avian Pathogenic E. coli
No full textThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permitsunrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Extra-intestinal pathogenic E. coli (ExPEC), including avian pathogenic E. coli (APEC), pose a considerable threat to both human and animal health, with illness causing substantial economic loss. APEC strain chi7122 (O78ratioK80ratioH9), containing three large plasmids [pChi7122-1 (IncFIB/FIIA-FIC), pChi7122-2 (IncFII), and pChi7122-3 (IncI(2))]; and a small plasmid pChi7122-4 (ColE2-like), has been used for many years as a model strain to study the molecular mechanisms of ExPEC pathogenicity and zoonotic potential. We previously sequenced and characterized the plasmid pChi7122-1 and determined its importance in systemic APEC infection; however the roles of the other pChi7122 plasmids were still ambiguous. Herein we present the sequence of the remaining pChi7122 plasmids, confirming that pChi7122-2 and pChi7122-3 encode an ABC iron transport system (eitABCD) and a putative type IV fimbriae respectively, whereas pChi7122-4 is a cryptic plasmid. New features were also identified, including a gene cluster on pChi7122-2 that is not present in other E. coli strains but is found in Salmonella serovars and is predicted to encode the sugars catabolic pathways. In vitro evaluation of the APEC chi7122 derivative strains with the three large plasmids, either individually or in combinations, provided new insights into the role of plasmids in biofilm formation, bile and acid tolerance, and the interaction of E. coli strains with 3-D cultures of intestinal epithelial cells. In this study, we show that the nature and combinations of plasmids, as well as the background of the host strains, have an effect on these phenomena. Our data reveal new insights into the role of extra-chromosomal sequences in fitness and diversity of ExPEC in their phenotypes
SI data: A high-throughput structural and electrochemical study of metallic glass formation in Ni-Ti-Al
No full textJournal: ACS Combinatorial Science
Title: A high-throughput structural and electrochemical study of metallic glass formation in Ni-Ti-Al
Author(s): Joress, Howie; DeCost, Brian; sarker, suchismita; Braun, Trevor; Jilani, Sidra; Smith, Ryan; Ward, Logan; Laws, Kevin; Mehta, Apurva; Hattrick-Simpers, Jaso
BENGALI AUTHORSHIP CLASSIFICATION CORPUS (BACC-18)
No full textIf you use the Dataset, please cite the following paper. @ARTICLE{9478882,
author={Hossain, Md. Rajib and Hoque, Mohammed Moshiul and Dewan, M. Ali Akber and Siddique, Nazmul and Islam, Md. Nazmul and Sarker, Iqbal H.},
journal={IEEE Access},
title={Authorship Classification in a Resource Constraint Language Using Convolutional Neural Networks},
year={2021},
volume={9},
number={},
pages={100319-100338},
doi={10.1109/ACCESS.2021.3095967}
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