Experimental Investigation of Lightweight Wall Panel Using Cenosphere Incorporated with Ground Granulated Blast Furnace Slag

The secondary form of waste is the major outcome of the various industries. Likewise, Cenosphere and Ground Granulateds Blast Furnace Slag (GGBS) are the waste material obtained from thermal power plants and the steel industry. This waste requires a large land area for disposal. In such cases, these can be used in the construction field. This paper investigated the lightweight wall panel made with cenosphere and GGBS as a replacement for cementitious material. Cenosphere was replaced at 5%, 10%, 15%, 20%, 25% and 30% respectively by weight of cement and GGBS was at 15% constant replacement of cement. The properties of wall panels such as compressive strength, flexural strength, and water absorption have been studied. The flexural behavior was carried out by inhibition of fiber into the matrix. The samples were tested at 7, 14, and 28 days respectively. The SEM analysis of the cenosphere has been carried out. The results infer an increase in the percentage of cenosphere does not impart strength to the mix. Therefore, 15% of constant replacement of GGBS to the mass of cement stabilize the strength which was lost due to the addition of the cenosphere. On an overall view, it was recommended that the strength loss of mixture due to the addition of the cenosphere can be alleviated by GGBS and nevertheless a secure value of strength can be gained

ECT associated musical hallucinations in an elderly patient: a case report

Electro Convulsive Therapy (ECT) is a medical treatment for severe mental illness in which small, carefully controlled electricity is applied to the brain. This electric stimulation is done in conjunction with anesthesia and muscle relaxant medications to produce a mild generalized seizure. This is used to treat a variety of psychiatric disorders. This is most effective in the treatment of severe depression providing a rapid relief. We report and discuss an unusual presentation of a ninety three year old lady with a diagnosis of Major Depressive Disorder, Recurrent, Severe with Psychotic features (296.34) who experienced musical hallucinations whilst she was treated on ECT. Clinically there was an inverse relationship between the biological symptoms of depression and musical hallucination during the ECT management. Though similar reports have never been reported earlier, we noticed a good association between the initiation of ECT and musical hallucination in our patient. The patient stopped experiencing musical hallucinations and improved of her biological symptoms of depression completely after the full course of ECT

Numerical Investigation of Aerofoil Cascade and Tandem Cascade Using Vortex Panel Method

Panel methods are the numerical schemes for solving linear, inviscid, irrotational flow fields about arbitrary bodies at subsonic free-stream Mach numbers. The basic procedure is to discretize the body in terms of singularity distribution on the body surface then satisfy the necessary boundary conditions. It helps to determine the resulting distribution of singularity on the surface, and there by obtaining fluid dynamic properties of the flow. This project work describes a method for simulating, the potential flow field about the arbitrary two-dimensional bodies using MATLAB program. Even though singularities can be used as sources, doublets, or vortices, at this point the panel method uses the vortex element because it is talented to model both lifting forces and pressures. The numerical codes developed for this purpose computes the circulation, flow velocities, coefficient of lift and coefficient of pressure distribution over various geometries along with the streamline of corresponding bodies. Similarly the flow analysis is done for the same two dimensional bodies using FLUENT flow simulation tool and the results have been compared. The advantages of this numerical scheme over the conventional flow analysis are also presented in terms of reliable flow field data

A Better Engineering Design: Low Cost Assistance Kit for Manual Wheelchair Users with Enhanced Obstacle Detection

This paper proposes a better engineering design of an assistance kit for manual wheelchair users. The design is aimed  to enhance the detection of obstacles in the travelling path of the wheelchair  user at low cost. This is facilitated by microcontroller and sensor technologies. The proposed design provides the intended user with obstacle detection, light detection, a light emitting diode (LED) emergency light system, and an emergency alarm system. The microcontroller is the main controller that receives input from the sensors and produces output to the light crystal display (LCD) screen, the LED emergency light system, and the emergency alarm system. An ultrasonic sensor is used to detect the presence of obstacles directly behind the wheelchair. If any obstacle exists behind the wheelchair within a set range, the system will alert the wheelchair user through different alarm sounds. In the case of absence of light, the LED emergency light system is activated and turns on a light source, which is attached to the wheelchair to provide a bright and clear path for the user. The distance between the obstacle and the wheelchair, and the status of the LED emergency light system are displayed on the LCD screen

Optimization of CMT Welding Parameters of Stellite-6 on AISI316L Alloy Using TOPSIS Method

This article discusses the welding parameters optimization to find the quality of stellite-6 cladding on AISI304L austenite alloy using a new optimization method called Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). The experiments (31 nos.) were carried out with the cold metal arc transfer welding method (CMT) based on the central composite design (CCD). The cladding material is the stellite-6 alloy which is appreciated for its corrosion and wear resistance. Four factors (welding current, voltage, welding speed and torch angle) and five levels were considered for the experiment and the optimization. It is necessary to find the optimized parameters for the industrial applications as a huge number of experiments are not recommended. The optimization results showed that the 2nd experiment had the 1st rank with high relative closeness and the 19th experiment was in the last rank. Higher current and low welding speed yielded good results and a low corrosion rate of 0.004582 mm/yr. Furthermore, the Micro-structural, Corrosion study and the SEM-EDS of the specimen produced by the 2nd experiment are discussed here. EDS study showed the presence of Cr and Co elements in the cladding region with maximum

Numerical Simulation of Projectile Impact on Mild Steel ArmourPlates using LS-DYNA: Part I: Validation

The paper describes  the simulation of impact of jacketed projectiles on steel armour plates usingexplicit finite element analysis as implemented in LS-DYNA. Validation of numerical modelling includesa comprehensive mesh convergence study leading to insights not previously reported in literature,using shell, solid, and axisymmetric elements for representing target plates. It is shown for a numberof cases that with a proper choice of contact algorithm, element size, and strain rate-dependent materialproperties, computed projectile residual velocities can match closely with corresponding test-basedvalues. The modelling requirements are arrived at by correlating against published test residual velocities1for variants of mild steel plates (designated as MS1, MS2 and MS3) of different thicknesses at impactvelocities in the range of ~820-870 m/s. Using the validated numerical procedure, a number of parametricstudies such as the effect of projectile shape and geometric aspect ratios as well as plate thickness onresidual velocity have been carried out and presented in Part II of the current paper

Optimization of CMT Welding Parameters of Stellite-6 on AISI316L Alloy Using TOPSIS Method

This article discusses the welding parameters optimization to find the quality of stellite-6 cladding on AISI304L austenite alloy using a new optimization method called Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). The experiments (31 nos.) were carried out with the cold metal arc transfer welding method (CMT) based on the central composite design (CCD). The cladding material is the stellite-6 alloy which is appreciated for its corrosion and wear resistance. Four factors (welding current, voltage, welding speed and torch angle) and five levels were considered for the experiment and the optimization. It is necessary to find the optimized parameters for the industrial applications as a huge number of experiments are not recommended. The optimization results showed that the 2nd experiment had the 1st rank with high relative closeness and the 19th experiment was in the last rank. Higher current and low welding speed yielded good results and a low corrosion rate of 0.004582 mm/yr. Furthermore, the Micro-structural, Corrosion study and the SEM-EDS of the specimen produced by the 2nd experiment are discussed here. EDS study showed the presence of Cr and Co elements in the cladding region with maximum