62 research outputs found
Prevalence of specific learning disorders in school children in a South Indian city
No full textBackground: Specific learning disorders (SLDs) are an important cause of academic problems in school children mandating assessment and remediation.
Aim: To document the psychosocial profile and prevalence of SLDs in school children.
Materials and Methods: A total of 981 children studying in 3rd to 5th standard were screened for the presence of SLDs in a stepwise approach after taking permission from school authorities and consent from parents. Raven's Progressive Matrices, Malins Intelligence Scale, and NIMHANS SLD Index were used for assessment. Statistical analysis was performed using Epi info software.
Results: The prevalence of SLDs was found to be 6.1% (n = 60). Dyslexia was the most common SLD (n = 38; 63%) followed by combined type (n = 28; 46%). A significant association was found between consanguinity (P = 0.02) and delayed milestones (P = 0.02).
Conclusion: There is a need for creating the awareness among parents and teachers regarding SLDs and to screen children for the early identification and remediation
A Study on the Chromosomes of Konya Wild Sheep (Ovis orientalis spp.): Case Report
No full textBu araflt›rmada difli bir Konya yaban koyunundan (Ovis orientalis) elde edilen kromozomlar say› ve flekil bak›m›ndan incelendi.
G-bandla boyanm›fl kromozomlardan bir karyotip haz›rland›. Karyotipteki ilk 3 çift kromozomlar›n metasentrik, 23 çift kromozomun
ve X kromozomlar›n›n akrosentrik; toplam 54 adet diploid kromozoma sahip olduklar› belirlendi.We investigated the shape and number of chromosomes of Konya wild sheep. A karyotype was prepared from G-band
painted chromosomes. Konya wild sheep have 54 diploid chromosomes. The first three autosomal chromosomes were metacentric,
and the other autosomal chromosomes and X chromosomes were acrocentric
On the creep behaviour of Ni based solid solution alloys from binary to quaternary
No full textOn the creep behavior of Ni based solid solution alloys from binary to quaternary
A power-law relationship between the steady state strain rate (̇) and imposed stress (σ) is well established so that the ̇∝^, at a fixed temperature, where n is termed the stress exponent. Additional microstructural terms influencing creep such as the grain size and stacking fault energy (γ) have been incorporated into the creep equation in a power-law form, such as ̇∝^. In the case of an intragranular dislocation climb controlled creep in a solid solution alloy, the creep rate has been expressed as ̇∝^5^3, where D is the appropriate diffusion coefficient, n~5 and q~3. However, an evaluation of the earlier creep data suggests that while q~3 is reasonable for pure metals, there is considerable uncertainty in the value of q for solid solution alloys.
The current study focuses on characterizing the creep behavior and the value of q for Ni – xCo alloys, with x = 10, 33, and 60, where the addition of Co reduces the stacking fault energy. Following creep in Ni-Co alloys, the creep behaviour of CSSAs NiCoCr and NiCoCrFe was also investigated to probe potential changes in the creep mechanisms with the addition of alloying element. All alloys are single phase solid solutions with a face-centered cubic (f.c.c.) crystal structure. Prior to the creep, all alloys had a grain size d~100 μm. The observed stacking fault energies through weak beam dark field technique are 10 – 36 mJ m^-2 for Ni – 60 Co, 14 – 27 mJ m^-2 for NiCoCr, and 11 – 26 mJ m^-2 for NiCoCrFe alloys. At a creep testing temperature of 1015 K, the stress exponent n ~ 5 for binary Ni – Co alloys, suggesting that dislocation climb is the creep rate controlling mechanism. The cell structure observed through electron channel contrast imaging in the crept samples of the alloys is consistent with a dislocation climb mechanism. The stacking fault energy exponent q ~ 2 in Ni– (x) Co binary solid solution alloys.
At 990 K, the creep rates of the NiCoCr and NiCoCrFe alloys were observed to be similar with a stress exponent n~5. Both the ternary and quaternary alloys showed significantly lower creep rates compared to the Ni – (x) Co binary alloys. Creep deformation did not cause any phase change in the NiCoCrFe alloy. Although the Ni – (x) Co alloys, NiCoCr, and NiCoCrFe alloys exhibited a similar stress exponent of n~5, the crept substructure in the NiCoCr and NiCoCrFe alloy showed planar band features. The possible causes for the observed differences in creep behavior between the Ni-Co binary alloys and the other concentrated solid solution alloys will be discussed
Constructing a wire-frame from views on arbitrary view planes for objects with conic sections inclined to all view planes
No full textA new and efficient approach to construct a 3D wire-frame of an object from its orthographic projections is described. The input projections can be two or more and can include regular and complete auxiliary views. Each view may contain linear, circular and other conic sections. The output is a 3D wire-frame that is consistent with the input views. The approach can handle auxiliary views containing curved edges. This generality derives from a new technique to construct 3D vertices from the input 2D vertices (as opposed to matching coordinates that is prevalent in current art). 3D vertices are constructed by projecting the 2D vertices in a pair of views on the common line of the two views. The construction of 3D edges also does not require the addition of silhouette and tangential vertices and subsequently splitting edges in the views. The concepts of complete edges and n-tuples are introduced to obviate this need. Entities corresponding to the 3D edge in each view are first identified and the 3D edges are then constructed from the information available with the matching 2D edges. This allows the algorithm to handle conic sections that are not parallel to any of the viewing directions. The localization of effort in constructing 3D edges is the source of efficiency of the construction algorithm as it does not process all potential 3D edges. Working of the algorithm on typical drawings is illustrated. (C) 2011 Elsevier Ltd. All rights reserved
Quality attributes of dahi prepared from milk fortified with omega-3 fatty acids, phytosterols and polydetxrose
No full textEnhanced near-infrared photoacoustic imaging of silica-coated rare-earth doped nanoparticles
No full text[[abstract]]Near-infrared photoacoustic (PA) imaging is an emerging diagnostic technology that utilizes the tissue transparent window to achieve improved contrast and spatial resolution for deep tissue imaging. In this study, we investigated the enhancement effect of the SiO2 shell on the PA property of our core/shell rare-earth nanoparticles (REs) consisting of an active rare-earth doped core of NaYF4:Yb,Er (REDNPs) and an undoped NaYF4 shell. We observed that the PA signal amplitude increased with SiO2 shell thickness. Although the SiO2 shell caused an observed decrease in the integrated fluorescence intensity due to the dilution effect, fluorescence quenching of the rare earth emitting ions within the REDNPs cores was successfully prevented by the undoped NaYF4 shell. Therefore, our multilayer structure consisting of an active core with successive functional layers was demonstrated to be an effective design for dual-modal fluorescence and PA imaging probes with improved PA property. The result from this work addresses a critical need for the development of dual-modal contrast agent that advances deep tissue imaging with high resolution and signal-to-noise ratio
Size and shell effects on the photoacoustic and luminescence properties of dual modal rare-earth-doped nanoparticles for infrared photoacoustic imaging
No full text[[abstract]]Infrared-emitting rare-earth (ytterbium and erbium) doped nanoparticles (REDNPs) have recently emerged as an excellent probe for both deep tissue luminescence and photoacoustic (PA) imaging with high resolutions and contrast. Here we report on the first study of the size and surface effects of the infrared PA imaging of dual modal REDNPs. We show that the PA signal amplitude generated by REDNPs is increased by increasing the size and coating the inorganic shell (undoped NaYF4 or silica). We have also discovered that the choice of the coating material is critical as undoped NaYF4 shell was able to enhance PA signal amplitude (by up to ?30%) and infrared emission (19 times) simultaneously. The simultaneous enhancement of PA signal amplitude and infrared emission was due to increased phonon modes and reduced surface effects. The in vivo PA images obtained demonstrated that in addition to being excellent luminescent probes, the REDNPs also performed as successful PA contrast agents to visualize rodent cortical blood vessels
Multiple time-lag canonical correlation analysis for removing muscular artifacts in EEG
No full text10.1109/EMBC.2013.6611116Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS6792-679
Cardiovascular Classification Using Efficient Net on Electrocardiogram Images
No full textCardiovascular disease ranks among the top causes of mortality, frequently caused by sudden obstructions within blood vessels. Timely identification and intervention are essential for minimizing the impact of the disease. This research employs image augmentation techniques to correct class imbalance in an ECG image dataset divided into five categories: Normal, Abnormal Heartbeat, Myocardial Infarction, Previous History of Myocardial Infarction, and COVID-19. The balanced dataset includes 6,322 images. To improve classification accuracy for cardiovascular diseases, three pre-trained models visual Geometric Group, Residual, Dense, and Efficient Network with Version 2, were trained on the balanced ECG dataset. Critical hyper parameters were fine-tuned, yielding optimal performance with a learning rate set at 0.00001, a dropout rate of 0.3, and utilizing the Adam optimizer. EfficientNet-V2 outperformed the other models, reaching a level of accuracies of 96.22%, precision 96.34%, recall 96.31%, 95.89%, 94.75%, and an F1-Score of 96.33%, thus exceeding the performance of Densenet 161, Densenet 201, ResNet50 and VGG16
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