Displaying publications 281 - 300 of 9853 in total

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  1. Foo ME, Gopinath SCB
    Biomed Pharmacother, 2017 Oct;94:354-361.
    PMID: 28772213 DOI: 10.1016/j.biopha.2017.07.122
    Nanotechnology is the developing field, bringing the materials in the nanoscale level, has been applied in the interdisciplinary sciences. Different nanomaterials, such as gold, silver, zinc, copper and graphene are shown to have a wide range of applications. Among these, graphene is one of the faster upcoming two-dimensional nanomaterials utilized in various fields due to its positive features including the properties of thermal, electrical, strength and elasticity. Biomedical applications of graphene have been widely attested to be popular among academician and industrial partners for creating next generation medical systems and therapies. In this review, we selectively revealed the current applications of graphene in the interdisciplinary medical sciences.
    Matched MeSH terms: Biosensing Techniques/methods*; Drug Delivery Systems/methods*; Biomedical Research/methods*
  2. Sulaiman A, Farid M, Silva FV
    Food Sci Technol Int, 2017 Jun;23(4):293-309.
    PMID: 28595485 DOI: 10.1177/1082013216685485
    Strawberry puree was processed for 15 min using thermal (65 ℃), high-pressure processing (600 MPa, 48 ℃), and ultrasound (24 kHz, 1.3 W/g, 33 ℃). These conditions were selected based on similar polyphenoloxidase inactivation (11%-18%). The specific energies required for the above-mentioned thermal, high-pressure processing, and power ultrasound processes were 240, 291, and 1233 kJ/kg, respectively. Then, the processed strawberry was stored at 3 ℃ and room temperature for 30 days. The constant pH (3.38±0.03) and soluble solids content (9.03 ± 0.25°Brix) during storage indicated a microbiological stability. Polyphenoloxidase did not reactivate during storage. The high-pressure processing and ultrasound treatments retained the antioxidant activity (70%-74%) better than the thermal process (60%), and high-pressure processing was the best treatment after 30 days of ambient storage to preserve antioxidant activity. Puree treated with ultrasound presented more color retention after processing and after ambient storage than the other preservation methods. For the three treatments, the changes of antioxidant activity and total color difference during storage were described by the fractional conversion model with rate constants k ranging between 0.03-0.09 and 0.06-0.22 day - 1, respectively. In resume, high-pressure processing and thermal processes required much less energy than ultrasound for the same polyphenoloxidase inactivation in strawberry. While high-pressure processing retained better the antioxidant activity of the strawberry puree during storage, the ultrasound treatment was better in terms of color retention.
    Matched MeSH terms: Food Handling/methods*; Food Preservation/methods; Food Storage/methods*
  3. Goh BL
    Contrib Nephrol, 2017;189:79-84.
    PMID: 27951553
    BACKGROUND: The success rate of peritoneal dialysis (PD) catheter insertion is known to vary among different operators and may be influenced by many factors such as patient and various situational factors. Traditionally, surgeons have inserted Tenckhoff catheters by mini-laparotomy or an open technique. However, with recent advances in endoscopic instrumentation and video capabilities, peritoneoscope Tenckhoff catheter insertion has become a viable approach in interventional nephrologist-initiated PD access programmes.

    SUMMARY: Nephrologist-initiated peritoneoscopic PD access programs have had a positive impact on PD penetration. The technique has been associated with a better primary success rate, superior catheter survival, less postoperative pain, shorter hospital stay, and shorter catheter break-in time compared with the conventional surgical technique. The role of interventional nephrologists in peritoneoscope Tenckhoff catheter placement is still perceived to be a relatively new advance, investigational by some, and many nephrologists and surgeons alike remain sceptical of the value of this recent option. Crucial questions often raised are how many procedures one needs to perform before being considered competent and who should be credentialed to perform the procedure or supervise trainees performing it. The evaluation of technical proficiency in a specific operation is difficult and complex. Cumulative summation (CUSUM) analysis is one option for tracking the success and failure of technical skill and examining trends over time. Key Messages: The author's facility has had good outcomes with a nephrologist-initiated peritoneoscopic PD access programme. Quality control of PD catheter insertion can be performed using CUSUM charting to monitor for primary catheter dysfunction, primary leak, and primary peritonitis.

    Matched MeSH terms: Catheterization/methods*; Peritoneal Dialysis/methods*; Laparoscopy/methods*
  4. Gandhamal A, Talbar S, Gajre S, Hani AF, Kumar D
    Comput Biol Med, 2017 04 01;83:120-133.
    PMID: 28279861 DOI: 10.1016/j.compbiomed.2017.03.001
    Most medical images suffer from inadequate contrast and brightness, which leads to blurred or weak edges (low contrast) between adjacent tissues resulting in poor segmentation and errors in classification of tissues. Thus, contrast enhancement to improve visual information is extremely important in the development of computational approaches for obtaining quantitative measurements from medical images. In this research, a contrast enhancement algorithm that applies gray-level S-curve transformation technique locally in medical images obtained from various modalities is investigated. The S-curve transformation is an extended gray level transformation technique that results into a curve similar to a sigmoid function through a pixel to pixel transformation. This curve essentially increases the difference between minimum and maximum gray values and the image gradient, locally thereby, strengthening edges between adjacent tissues. The performance of the proposed technique is determined by measuring several parameters namely, edge content (improvement in image gradient), enhancement measure (degree of contrast enhancement), absolute mean brightness error (luminance distortion caused by the enhancement), and feature similarity index measure (preservation of the original image features). Based on medical image datasets comprising 1937 images from various modalities such as ultrasound, mammograms, fluorescent images, fundus, X-ray radiographs and MR images, it is found that the local gray-level S-curve transformation outperforms existing techniques in terms of improved contrast and brightness, resulting in clear and strong edges between adjacent tissues. The proposed technique can be used as a preprocessing tool for effective segmentation and classification of tissue structures in medical images.
    Matched MeSH terms: Image Enhancement/methods*; Image Interpretation, Computer-Assisted/methods*; Pattern Recognition, Automated/methods*
  5. Sanchez Bornot JM, Wong-Lin K, Ahmad AL, Prasad G
    Brain Topogr, 2018 11;31(6):895-916.
    PMID: 29546509 DOI: 10.1007/s10548-018-0640-0
    The brain's functional connectivity (FC) estimated at sensor level from electromagnetic (EEG/MEG) signals can provide quick and useful information towards understanding cognition and brain disorders. Volume conduction (VC) is a fundamental issue in FC analysis due to the effects of instantaneous correlations. FC methods based on the imaginary part of the coherence (iCOH) of any two signals are readily robust to VC effects, but neglecting the real part of the coherence leads to negligible FC when the processes are truly connected but with zero or π-phase (modulus 2π) interaction. We ameliorate this issue by proposing a novel method that implements an envelope of the imaginary coherence (EIC) to approximate the coherence estimate of supposedly active underlying sources. We compare EIC with state-of-the-art FC measures that included lagged coherence, iCOH, phase lag index (PLI) and weighted PLI (wPLI), using bivariate autoregressive and stochastic neural mass models. Additionally, we create realistic simulations where three and five regions were mapped on a template cortical surface and synthetic MEG signals were obtained after computing the electromagnetic leadfield. With this simulation and comparison study, we also demonstrate the feasibility of sensor FC analysis using receiver operating curve analysis whilst varying the signal's noise level. However, these results should be interpreted with caution given the known limitations of the sensor-based FC approach. Overall, we found that EIC and iCOH demonstrate superior results with most accurate FC maps. As they complement each other in different scenarios, that will be important to study normal and diseased brain activity.
    Matched MeSH terms: Brain Mapping/methods; Electroencephalography/methods*; Magnetoencephalography/methods*
  6. Asaithambi P, Aziz ARA, Sajjadi B, Daud WMABW
    Environ Sci Pollut Res Int, 2017 Feb;24(6):5168-5178.
    PMID: 27221586 DOI: 10.1007/s11356-016-6909-5
    In the present work, the efficiency of the sonication, electrocoagulation, and sono-electrocoagulation process for removal of pollutants from the industrial effluent of the pulp and paper industry was compared. The experimental results showed that the sono-electrocoagulation process yielded higher pollutant removal percentage compared to the sonication and electrocoagulation process alone. The effect of the operating parameters in the sono-electrocoagulation process such as electrolyte concentration (1-5 g/L), current density (1-5 A/dm(2)), effluent pH (3-11), COD concentration (1500-6000 mg/L), inter-electrode distance (1-3 cm), and electrode combination (Fe and Al) on the color removal, COD removal, and power consumption were studied. The maximum color and COD removal percentages of 100 and 95 %, respectively, were obtained at the current density of 4 A/dm(2), electrolyte concentration of 4 g/L, effluent pH of 7, COD concentration of 3000 mg/L, electrode combination of Fe/Fe, inter-electrode distance of 1 cm, and reaction time of 4 h, respectively. The color and COD removal percentages were analyzed by using an UV/Vis spectrophotometer and closed reflux method. The results showed that the sono-electrocoagulation process could be used as an efficient and environmental friendly technique for complete pollutant removal.
    Matched MeSH terms: Electrocoagulation/methods*; Waste Disposal, Fluid/methods; Water Purification/methods*
  7. Low TY, Syafruddin SE, Mohtar MA, Vellaichamy A, A Rahman NS, Pung YF, et al.
    Cell Mol Life Sci, 2021 Jul;78(13):5325-5339.
    PMID: 34046695 DOI: 10.1007/s00018-021-03856-0
    Protein-protein interactions are fundamental to various aspects of cell biology with many protein complexes participating in numerous fundamental biological processes such as transcription, translation and cell cycle. MS-based proteomics techniques are routinely applied for characterising the interactome, such as affinity purification coupled to mass spectrometry that has been used to selectively enrich and identify interacting partners of a bait protein. In recent years, many orthogonal MS-based techniques and approaches have surfaced including proximity-dependent labelling of neighbouring proteins, chemical cross-linking of two interacting proteins, as well as inferring PPIs from the co-behaviour of proteins such as the co-fractionating profiles and the thermal solubility profiles of proteins. This review discusses the underlying principles, advantages, limitations and experimental considerations of these emerging techniques. In addition, a brief account on how MS-based techniques are used to investigate the structural and functional properties of protein complexes, including their topology, stoichiometry, copy number and dynamics, are discussed.
    Matched MeSH terms: Chromatography, Affinity/methods*; Mass Spectrometry/methods*; Protein Interaction Mapping/methods*
  8. Chaibun T, Puenpa J, Ngamdee T, Boonapatcharoen N, Athamanolap P, O'Mullane AP, et al.
    Nat Commun, 2021 02 05;12(1):802.
    PMID: 33547323 DOI: 10.1038/s41467-021-21121-7
    Coronavirus disease 2019 (COVID-19) is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Diagnosis of COVID-19 depends on quantitative reverse transcription PCR (qRT-PCR), which is time-consuming and requires expensive instrumentation. Here, we report an ultrasensitive electrochemical biosensor based on isothermal rolling circle amplification (RCA) for rapid detection of SARS-CoV-2. The assay involves the hybridization of the RCA amplicons with probes that were functionalized with redox active labels that are detectable by an electrochemical biosensor. The one-step sandwich hybridization assay could detect as low as 1 copy/μL of N and S genes, in less than 2 h. Sensor evaluation with 106 clinical samples, including 41 SARS-CoV-2 positive and 9 samples positive for other respiratory viruses, gave a 100% concordance result with qRT-PCR, with complete correlation between the biosensor current signals and quantitation cycle (Cq) values. In summary, this biosensor could be used as an on-site, real-time diagnostic test for COVID-19.
    Matched MeSH terms: Biosensing Techniques/methods*; Nucleic Acid Amplification Techniques/methods; Electrochemical Techniques/methods*
  9. Jailani AS, Balqis-Ali NZ, Tang KF, Fun WH, Samad SA, Jahaya R, et al.
    BMC Public Health, 2023 Nov 14;23(1):2243.
    PMID: 37964260 DOI: 10.1186/s12889-023-17132-2
    INTRODUCTION: High-risk human papillomavirus (HPV) screening is vital for early cervical cancer detection and treatment. With the introduction of the national cervical cancer screening programme and screening registry in Malaysia, there is a need to monitor population-based HPV screening uptake and high-risk HPV prevalence as part of cervical cancer surveillance.

    OBJECTIVE: To determine the prevalence and sociodemographic factors predicting high-risk HPV infection in Malaysia based on a public, community-based cervical cancer screening registry targeting women at risk of getting HPV infection.

    METHODS: The study used data from the Malaysian cervical cancer screening registry established by the Family Health Development Division from 2019 to 2021. The registry recorded sociodemographic data, HPV test details and results of eligible women who underwent HPV screening at public primary healthcare facilities. A vaginal sample (via self-sampling or assisted by a healthcare provider) was used for DNA extraction for HPV detection and genotyping. Registry data were extracted and analysed to determine prevalence estimates of high-risk HPV infection. Multifactorial logistic regression analysis was conducted to determine predictors of high-risk HPV infection. All analyses were performed using Stata version 14.

    RESULTS: The programme screened a total of 36,738 women during the study period. Women who attended the screening programme were mainly from urban areas, aged 30-39 years, and of Malay ethnicity. The prevalence of high-risk HPV infection was 4.53% among women screened, with the yearly prevalence ranging from 4.27 to 4.80%. A higher prevalence was observed among urban settling women, those aged 30-49 years, those of Indian ethnicity, and those without children. The results from logistic regression showed that women from urban areas, lower age groups, of Indian or Chinese ethnicity, and who are self-employed were more likely to be infected with high-risk HPV.

    CONCLUSION: Targeted and robust strategies to reach identified high-risk groups are needed in Malaysia. In addition, the registry has the potential to be expanded for an improved cervical cancer elimination plan.

    TRIAL REGISTRATION: Trial registration number: NMRR ID-22-00187-DJU.

    Matched MeSH terms: Mass Screening/methods; Vaginal Smears/methods; Early Detection of Cancer/methods
  10. Schönbach C, Li J, Ma L, Horton P, Sjaugi MF, Ranganathan S
    BMC Genomics, 2018 01 19;19(Suppl 1):920.
    PMID: 29363432 DOI: 10.1186/s12864-017-4326-x
    The 16th International Conference on Bioinformatics (InCoB) was held at Tsinghua University, Shenzhen from September 20 to 22, 2017. The annual conference of the Asia-Pacific Bioinformatics Network featured six keynotes, two invited talks, a panel discussion on big data driven bioinformatics and precision medicine, and 66 oral presentations of accepted research articles or posters. Fifty-seven articles comprising a topic assortment of algorithms, biomolecular networks, cancer and disease informatics, drug-target interactions and drug efficacy, gene regulation and expression, imaging, immunoinformatics, metagenomics, next generation sequencing for genomics and transcriptomics, ontologies, post-translational modification, and structural bioinformatics are the subject of this editorial for the InCoB2017 supplement issues in BMC Genomics, BMC Bioinformatics, BMC Systems Biology and BMC Medical Genomics. New Delhi will be the location of InCoB2018, scheduled for September 26-28, 2018.
    Matched MeSH terms: Genomics/methods*; Systems Biology/methods*; High-Throughput Nucleotide Sequencing/methods*
  11. Junaid M, Khir MHM, Witjaksono G, Tansu N, Saheed MSM, Kumar P, et al.
    Molecules, 2020 Aug 11;25(16).
    PMID: 32796504 DOI: 10.3390/molecules25163646
    Graphene and its hybrids are being employed as potential materials in light-sensing devices due to their high optical and electronic properties. However, the absence of a bandgap in graphene limits the realization of devices with high performance. In this work, a boron-doped reduced graphene oxide (B-rGO) is proposed to overcome the above problems. Boron doping enhances the conductivity of graphene oxide and creates several defect sites during the reduction process, which can play a vital role in achieving high-sensing performance of light-sensing devices. Initially, the B-rGO is synthesized using a modified microwave-assisted hydrothermal method and later analyzed using standard FESEM, FTIR, XPS, Raman, and XRD techniques. The content of boron in doped rGO was found to be 6.51 at.%. The B-rGO showed a tunable optical bandgap from 2.91 to 3.05 eV in the visible spectrum with an electrical conductivity of 0.816 S/cm. The optical constants obtained from UV-Vis absorption spectra suggested an enhanced surface plasmon resonance (SPR) response for B-rGO in the theoretical study, which was further verified by experimental investigations. The B-rGO with tunable bandgap and enhanced SPR could open up the solution for future high-performance optoelectronic and sensing applications.
    Matched MeSH terms: Electrochemistry/methods*; Biosensing Techniques/methods*; Surface Plasmon Resonance/methods*
  12. Sue MJ, Yeap SK, Omar AR, Tan SW
    Biomed Res Int, 2014;2014:653014.
    PMID: 24971343 DOI: 10.1155/2014/653014
    Polymerase chain reaction-enzyme linked immunosorbent assay (PCR-ELISA) is an immunodetection method that can quantify PCR product directly after immobilization of biotinylated DNA on a microplate. This method, which detects nucleic acid instead of protein, is a much more sensitive method compared to conventional PCR method, with shorter analytical time and lower detection limit. Its high specificity and sensitivity, together with its semiquantitative ability, give it a huge potential to serve as a powerful detection tool in various industries such as medical, veterinary, and agricultural industries. With the recent advances in PCR-ELISA, it is envisaged that the assay is more widely recognized for its fast and sensitive detection limit which could improve overall diagnostic time and quality.
    Matched MeSH terms: Enzyme-Linked Immunosorbent Assay/methods*; Polymerase Chain Reaction/methods*; Molecular Diagnostic Techniques/methods*
  13. Subramaniam S, Piozzi GN, Kim SH, Khan JS
    Colorectal Dis, 2024 Jul;26(7):1447-1455.
    PMID: 38812078 DOI: 10.1111/codi.17046
    The robotic approach is rapidly gaining momentum in colorectal surgery. Its benefits in pelvic surgery have been extensively discussed and are well established amongst those who perform minimally invasive surgery. However, the same cannot be said for the robotic approach for colonic resection, where its role is still debated. Here we aim to provide an extensive debate between selective and absolute use of the robotic approach for colonic resection by combining the thoughts of experts in the field of robotic and minimally invasive colorectal surgery, dissecting all key aspects for a critical view on this exciting new paradigm in colorectal surgery.
    Matched MeSH terms: Colorectal Surgery/methods; Laparoscopy/methods; Minimally Invasive Surgical Procedures/methods
  14. Abdulghani HM, Sattar K, Ahmad T, Akram A, Khalil MS
    PLoS One, 2021;16(3):e0249319.
    PMID: 33780493 DOI: 10.1371/journal.pone.0249319
    Faculty development programs (FD) prepare the faculty for their educational role and career tasks. We aimed to evaluate the effectiveness of FDP in advancing the quality of short-answer questions (SAQs). This was a quasi-experimental study, comprising 37 new faculty. The SAQs were examined on psychometric analysis and Bloom's cognitive levels for the two educational blocks of 1st medical year (i.e. Musculoskeletal (MSK) and Renal blocks). We found substantial improvement in the discrimination index values of SAQs prepared after the workshop (p = 0.04). A higher number of SAQs with moderate difficulty and higher discrimination were also observed. Flaws within the post-workshop questions were reduced (3.0%) when compared with pre-workshop (12.5%). The major incline was also reported within Bloom's cognitive levels when pre-workshop K2 questions (30%) were compared with post-workshop (45.5%) with a p-value = 0.05. The SAQs constructed by the faculty member without participating in FDP are generally of unsatisfactory quality. After the FDP the assessment items of two blocks improved for various parameters of student assessment. The current study advocates that newly joined faculty shall be provided with the FDP to be guided, trained and supported for improving the quality of assessment through SAQs items writing.
    Matched MeSH terms: Educational Measurement/methods; Psychometrics/methods; Staff Development/methods
  15. Aziz AT, Al-Shami SA, Mahyoub JA, Hatabbi M, Ahmad AH, Md Rawi CS
    Parasit Vectors, 2014;7:487.
    PMID: 25403705 DOI: 10.1186/s13071-014-0487-5
    Currently, dengue fever is considered as the main health problem in several parts (Mekkah, Jeddah, Jazan and Najran) of Kingdom of Saudi Arabia (KSA) with dramatically increase in the number of cases reported every year. This is associated with obvious ineffectiveness in the recent control and management programs for the mosquito vector (Aedes aegypti). Here, we suggested promoting the health education and public awareness among Saudi people to improve the control of dengue mosquito vector. Several suggestions and recommendations were highlighted here to ensure effectiveness in the future control and management programs of dengue mosquito vector in KSA.
    Matched MeSH terms: Mosquito Control/methods*
  16. Islam MJ, Reza AW, Kausar AS, Ramiah H
    ScientificWorldJournal, 2014;2014:306270.
    PMID: 25133220 DOI: 10.1155/2014/306270
    The advent of technology with the increasing use of wireless network has led to the development of Wireless Body Area Network (WBAN) to continuously monitor the change of physiological data in a cost efficient manner. As numerous researches on wave propagation characterization have been done in intrabody communication, this study has given emphasis on the wave propagation characterization between the control units (CUs) and wireless access point (AP) in a hospital scenario. Ray tracing is a tool to predict the rays to characterize the wave propagation. It takes huge simulation time, especially when multiple transmitters are involved to transmit physiological data in a realistic hospital environment. Therefore, this study has developed an accelerated ray tracing method based on the nearest neighbor cell and prior knowledge of intersection techniques. Beside this, Red-Black tree is used to store and provide a faster retrieval mechanism of objects in the hospital environment. To prove the superiority, detailed complexity analysis and calculations of reflection and transmission coefficients are also presented in this paper. The results show that the proposed method is about 1.51, 2.1, and 2.9 times faster than the Object Distribution Technique (ODT), Space Volumetric Partitioning (SVP), and Angular Z-Buffer (AZB) methods, respectively. To show the various effects on received power in 60 GHz frequency, few comparisons are made and it is found that on average -9.44 dBm, -8.23 dBm, and -9.27 dBm received power attenuations should be considered when human, AP, and CU move in a given hospital scenario.
    Matched MeSH terms: Remote Sensing Technology/methods*
  17. Al-Qazzaz NK, Ali SH, Ahmad SA, Chellappan K, Islam MS, Escudero J
    ScientificWorldJournal, 2014;2014:906038.
    PMID: 25093211 DOI: 10.1155/2014/906038
    The early detection and classification of dementia are important clinical support tasks for medical practitioners in customizing patient treatment programs to better manage the development and progression of these diseases. Efforts are being made to diagnose these neurodegenerative disorders in the early stages. Indeed, early diagnosis helps patients to obtain the maximum treatment benefit before significant mental decline occurs. The use of electroencephalogram as a tool for the detection of changes in brain activities and clinical diagnosis is becoming increasingly popular for its capabilities in quantifying changes in brain degeneration in dementia. This paper reviews the role of electroencephalogram as a biomarker based on signal processing to detect dementia in early stages and classify its severity. The review starts with a discussion of dementia types and cognitive spectrum followed by the presentation of the effective preprocessing denoising to eliminate possible artifacts. It continues with a description of feature extraction by using linear and nonlinear techniques, and it ends with a brief explanation of vast variety of separation techniques to classify EEG signals. This paper also provides an idea from the most popular studies that may help in diagnosing dementia in early stages and classifying through electroencephalogram signal processing and analysis.
    Matched MeSH terms: Electroencephalography/methods*
  18. Wan Mohtar WH, ElShafie A
    ScientificWorldJournal, 2014;2014:683537.
    PMID: 25250384 DOI: 10.1155/2014/683537
    Shear-free turbulence generated from an oscillating grid in a water tank impinging on an impermeable surface at varying Reynolds number 74 ≤ Re(l) ≤ 570 was studied experimentally, where the Reynolds number is defined based on the root-mean-square (r.m.s) horizontal velocity and the integral length scale. A particular focus was paid to the turbulence characteristics for low Re(l) < 150 to investigate the minimum limit of Re l obeying the profiles of rapid distortion theory. The measurements taken at near base included the r.m.s turbulent velocities, evolution of isotropy, integral length scales, and energy spectra. Statistical analysis of the velocity data showed that the anisotropic turbulence structure follows the theory for flows with Re(l) ≥ 117. At low Re(l) < 117, however, the turbulence profile deviated from the prediction where no amplification of horizontal velocity components was observed and the vertical velocity components were seen to be constant towards the tank base. Both velocity components sharply decreased towards zero at a distance of ≈ 1/3 of the integral length scale above the base due to viscous damping. The lower limit where Re(l) obeys the standard profile was found to be within the range 114 ≤ Re(l) ≤ 116.
    Matched MeSH terms: Rheology/methods*
  19. Abbas M, Abd Majid A, Ali JM
    ScientificWorldJournal, 2014;2014:391568.
    PMID: 24757421 DOI: 10.1155/2014/391568
    We present the smooth and visually pleasant display of 2D data when it is convex, which is contribution towards the improvements over existing methods. This improvement can be used to get the more accurate results. An attempt has been made in order to develop the local convexity-preserving interpolant for convex data using C(2) rational cubic spline. It involves three families of shape parameters in its representation. Data dependent sufficient constraints are imposed on single shape parameter to conserve the inherited shape feature of data. Remaining two of these shape parameters are used for the modification of convex curve to get a visually pleasing curve according to industrial demand. The scheme is tested through several numerical examples, showing that the scheme is local, computationally economical, and visually pleasing.
    Matched MeSH terms: Image Enhancement/methods
  20. Jahangirzadeh A, Basser H, Akib S, Karami H, Naji S, Shamshirband S
    PLoS One, 2014;9(2):e98592.
    PMID: 24919065 DOI: 10.1371/journal.pone.0098592
    The scour phenomenon around bridge piers causes great quantities of damages annually all over the world. Collars are considered as one of the substantial methods for reducing the depth and volume of scour around bridge piers. In this study, the experimental and numerical methods are used to investigate two different shapes of collars, i.e, rectangular and circular, in terms of reducing scour around a single bridge pier. The experiments were conducted in hydraulic laboratory at university of Malaya. The scour around the bridge pier and collars was simulated numerically using a three-dimensional, CFD model namely SSIIM 2.0, to verify the application of the model. The results indicated that although, both types of collars provides a considerable decrease in the depth of the scour, the rectangular collar, decreases scour depth around the pier by 79 percent, and has better performance compared to the circular collar. Furthermore, it was observed that using collars under the stream's bed, resulted in the most reduction in the scour depth around the pier. The results also show the SSIIM 2.0 model could simulate the scour phenomenon around a single bridge pier and collars with sufficient accuracy. Using the experimental and numerical results, two new equations were developed to predict the scour depth around a bridge pier exposed to circular and rectangular collars.
    Matched MeSH terms: Engineering/methods*
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