Abstract
The researchers are continuously working on nanomaterials and exploring many multidisciplinary applications in thermal engineering, biomedical and industrial systems. In current problem, the ...analytical simulations for performed for thermos-migration flow of nanofluid subject to the thermal radiation and porous media. The moving wedge endorsed the flow pattern. The heat source effects are also utilized to improves the heat transfer rate. The applications of thermophoresis phenomenon are addressed. The formulated set of expressions are analytically treated with implementation of variational iteration method (VIM). The simulations are verified by making the comparison the numerical date with existing literature. The VIM analytical can effectively tackle the nonlinear coupled flow system effectively. The physical impact for flow regime due to different parameters is highlighted. Moreover, the numerical outcomes are listed for Nusselt number.
In this study, selenium nanoparticles (SeNPs) and cerium oxide nanoparticles (CeONPs) were synthesized by using the extract of
leaves, and
rhizomes, respectively, and investigated for the biological ...and sustainable control of yellow, or stripe rust, disease in wheat. The green synthesized NPs were characterized by UV-Visible spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and X-ray diffraction (XRD). The SeNPs and CeONPs, with different concentrations (i.e., 10, 20, 30, and 40 mg/L), were exogenously applied to wheat infected with
SeNPs and CeONPs, at a concentration of 30 mg/L, were found to be the most suitable concentrations, which reduced the disease severity and enhanced the morphological (plant height, root length, shoot length, leaf length, and ear length), physiological (chlorophyll and membrane stability index), biochemical (proline, phenolics and flavonoids) and antioxidant (SOD and POD) parameters. The antioxidant activity of SeNPs and CeONPs was also measured. For this purpose, different concentrations (50, 100, 150, 200 and 400 ppm) of both SeNPs and CeONPs were used. The concentration of 400 ppm most promoted the DPPH, ABTS and reducing power activity of both SeNPs and CeONPs. This study is considered the first biocompatible approach to evaluate the potential of green synthesized SeNPs and CeONPs to improve the health of yellow, or stripe rust, infected wheat plants and to provide an effective management strategy to inhibit the growth of
.
This study is focused on oxidative degradation of Methyl Orange, a common azo dye, catalyzed by nickel hydroxide in aqueous solution at 303, 313, 323, and 333 K. Sodium hypochlorite, sodium ...hydroxide, and nickel sulfate hexahydrate in distilled water were used as starting material for preparation of nickel hydroxide. Pyrex glass batch reactor was used to study the effect of various conditions such as temperature, concentration, agitation, and catalyst dose on catalytic degradation of Methyl Orange in aqueous medium. About 80% Methyl Orange was degraded in 120 min. Experimental data were subjected to kinetic analysis using CurveExpert software. Degradation reaction was taking place according to Langmuir-Hinshelwood mechanism. According to this mechanism, the reactants adsorb at the surface of catalyst in first step followed by reaction between adsorbed reactants in second step. Adsorption of Methyl Orange on surface of catalyst followed Langmuir adsorption isotherm. Apparent activation energy, true activation energy, and heat of adsorption were determined as 13.2, 32.7 and -23.5 kJ mol super(-1), respectively.
Polymer composites are an important class of materials widely being used for many applications. But the main concern of non-degradability and adverse environmental impact of the polymer matrices and ...the synthetic reinforcements have given forth the need of environmental-friendly polymer matrices and reinforcements used in them. An attempt of such kind is to use the natural plant fibres as the reinforcements that have no harmful impact on the environment and also, they are cost effective. With growing interest in natural fibres in recent years, a lot of work is being done in various directions, which need to be gathered up for a specific interest. So, the present article is an attempt to review and discuss the research works that have evaluated the natural plant fibres as reinforcements in polymer composites. Natural fibre composites show variation of properties such as fibre’s source, type and structure. Interfacial adhesion between the fibre and the matrix is the most important factor when tensile properties of natural fibre composites are under consideration. The interfacial strength can be improved by some chemical modification of fibre surface, which changes the adhesion between fibre and matrix. These features of natural fibres as compared to synthetic fibres are motivating manufacturers and the end users to switch to natural fibre-based products.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Objective: To calculate the diagnostic accuracy of Ultrasonography versus Magnetic Resonance Imaging in detecting endometrial carcinoma with histopathology kept as a gold standard.
Study Design: ...Cross-sectional study.
Place and Duration of Study: Department of Diagnostic Radiology, Pakistan Institute of Medical Sciences Hospital, Islamabad Pakistan, from Apr 2019 to Apr 2020.
Methodology: This study included patients of perimenopausal and post-menopausal age groups with abnormal uterine bleeding having a high index of suspicion for endometrial malignancy referred from the Gynecology department for an ultrasound examination. Patients having high suspicion for malignancy or inconclusive evidence on ultrasound were considered for Magnetic Resonance Imaging(MRI). All of them were followed for histopathological reports after surgical exploration. Clinical, sonological and Magnetic Resonance Imaging (MRI) findings, along with histopathological diagnosis, were documented.
Results: Mean age of the patients was 56.58±10.28. Of these eight patients, 8(21.1%) did not have carcinoma upon histopathology. The most common type of carcinoma was poorly differentiated endometrial adenocarcinoma. The diagnostic accuracy of ultrasound was found to be 47.35%, while that for Magnetic Resonance Imaging (MRI) was 71.05%. Sensitivity and specificity for Ultrasound versus Magnetic Resonance Imaging (MRI) were 53.33% versus 66.67% and 75% versus 87.50%, respectively. The mean endometrial thickness on ultrasound was 15.97±5.64 mm, while on MRI was 15.42±6.9 mm.
Conclusion: Magnetic Resonance Imaging (MRI) is a more accurate and sensitive modality in detecting endometrial carcinoma in patients with abnormal uterine bleeding.
Person re-identification (re-ID) is among the essential components that play an integral role in constituting an automated surveillance environment. Majorly, the problem is tackled using data ...acquired from vision sensors using appearance-based features, which are strongly dependent on visual cues such as color, texture, etc., consequently limiting the precise re-identification of an individual. To overcome such strong dependence on visual features, many researchers have tackled the re-identification problem using human gait, which is believed to be unique and provide a distinctive biometric signature that is particularly suitable for re-ID in uncontrolled environments. However, image-based gait analysis often fails to extract quality measurements of an individual's motion patterns owing to problems related to variations in viewpoint, illumination (daylight), clothing, worn accessories, etc. To this end, in contrast to relying on image-based motion measurement, this paper demonstrates the potential to re-identify an individual using inertial measurements units (IMU) based on two common sensors, namely gyroscope and accelerometer. The experiment was carried out over data acquired using smartphones and wearable IMUs from a total of 86 randomly selected individuals including 49 males and 37 females between the ages of 17 and 72 years. The data signals were first segmented into single steps and strides, which were separately fed to train a sequential deep recurrent neural network to capture implicit arbitrary long-term temporal dependencies. The experimental setup was devised in a fashion to train the network on all the subjects using data related to half of the step and stride sequences only while the inference was performed on the remaining half for the purpose of re-identification. The obtained experimental results demonstrate the potential to reliably and accurately re-identify an individual based on one's inertial sensor data.
Porcelain insulators have prodigious importance in electricity transmission and distribution network because of their high dielectric constant, electrical resistivity, and mechanical strength and ...these properties are closely connected to the microstructural details of the insulator. Three different porcelain insulators (Sample A, B and C) were reported in the present work. X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), three point bending test and density and pore analysis were carried out to investigate the structural and mechanical properties of various insulators. The analysis confirmed that the porcelain insulators are made of industrial alumina, quartz, clay, and feldspar having amorphous as well as crystalline phase in the body. The porosity, density, and bending strength were also calculated and a correlation was developed between mechanical strength of the insulator and various physio-chemical and microstructural properties. Sample A showed the highest value of bending strength i.e. 207.20 MPa and sample C the lowest value of 112.18 MPa while sample B demonstrated the intermediate value of 170.98 MPa. To formulate high strength porcelain insulators, it was concluded that the amount of amorphous phase, dispersed corundum, and mullite content are key factors to control the mechanical strength of porcelain insulators.
•Clay bricks were reinforced with natural and synthetic fibers.•Physical properties of fiber reinforced bricks were investigated.•Relationship among bulk density, water absorption and porosity were ...established.•Relationship was also established between water absorption and thermal conductivity.•Thermal conductivity was also verified analytically by finite element analysis.
Buildings consume more than 30% of primary energy in order to maintain their indoor temperature which varied due to heating and cooling losses. This energy consumption has been increased dramatically through the last decade due to population explosion, more time is spent indoors along with climate changes. Energy efficient building materials are the ultimate requirement and several insulating materials have been developed to minimize the carbon foot prints. Current research work deals with the conversion of conventional terra cotta brick to porous low thermal conductive brick using various organic fibers. Bamboo, jute, coir, sisal and polyester fibers are used in this research work while all having low embodied energy. Water absorption index of fibers and brick, bulk density and porosity of all types of bricks were measured and relationships with water absorption were also established. Reduction in thermal conductivity was observed, using steady state conduction apparatus: upto 18% reduction in thermal conductivity. Reduction in bulk density, thermal conductivity, and increase in water absorption were all attributed to porosity created by burning of fibers. Thermal conductivity was also estimated analytically by using finite element simulation using ANSYS platform, heat flow and temperature at both ends were selected parameters for input, whereas heat flux and temperature gradient were output. The maximum difference between experimental and analytical thermal conductivity was varied up to 7.8%, which verify its applicability.
Objective: To correspond clinical findings of patients with lower backache to those demonstrated at Magnetic Resonance Imaging of the Lumbosacral spine.
Study Design: Cross-sectional study.
Place and ...Duration of Study: Department of Diagnostic Radiology, Pakistan Institute of Medical Sciences Hospital, Islamabad Pakistan, from Oct 2019 to Jan 2020.
Methodology: All consecutive adult patients with lower backaches of more than one month duration were enrolled in the study. Detailed clinical history and examination were obtained. Pain scoring was done by visual analogue score, and a straight leg raise test was performed. Patients then underwent magnetic resonance imaging in the hospital, and findings were reported.
Results: Mean age of the patients was 30.2±13.53 with male preponderance. The mean duration of symptoms was 2.3±2.34 years. According to the visual analogue score, most patients had a moderate pain scale. Seventy-six percent of patients had no sensory deficit; upon clinical examination, twenty-one had a loss of power. Upon Lasegue Test, the majority (43,48.9%), had pain between 30-70 of hip flexion.
Conclusion: History and detailed clinical examination play an emphasising role in the treatment regimen of patients with lower backache, with special concern on the correlation of findings with Magnetic Resonance Imaging of the lumbosacral spine, thus alleviating morbidity of patients.
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