Silicone polymer although have some exceptional superior properties have limitations when it is exposed to harsh chemicals. Poly Ether Ketone (PEK), a high performance polymer is well known for its resistance towards acid, alkali and many solvents. PEK exhibits good environmental protection with better thermal stability. In the present study, the coatings were prepared using varying ratios of silicone and Poly Ether Ketone (PEK) with required coating additives, to study the effect of concentration of PEK on mechanical, chemical, thermal and performance properties. The clear coatings of Silicone/PEK cured films were characterized for TGA, FTIR, thermal resistance, corrosion resistance, resistance to 10% HCl, NaOH, NaCl, detergent solution and humidity resistance. The coating films were found to be stable up to 4500 C as indicated by TGA analysis. It is seen that the performance of silicone / PEK coating films increases with increasing concentration of PEK.
A green route was successfully developed to synthesize iron hexacyanocobaltate (FeHCC) by using Aeglemarmelos (bael) as a natural surfactant and water as a solvent. Nanocubes of FeHCC were obtained with size below 50 nm as confirmed by FE-SEM analysis.The significance of synthesis is in its quick approach with no thermal heat involvement, cost effectiveness and ability to fabricate uniformly distributed nanoparticles with small sizes. The catalytic potential of nanocubessynthesized was examined in treatment of simulated water containing 2, 4- dinitrophenol. Within few minutes of catalyst loading prominent oxidation occurred which was confirmed by GC-MS analysis. This is also supported by finding of small and non-toxic by-products like 4-oxobut-2-enoic acid, acrylic acid and 2-hydroxyacetic acidthose ultimately fateinto mineralization. With high potential in removal of 2, 4- dinitrophenol,FeHCCnanocubes can be used as important adsorbents in waste water treatment with a bright future.
An ecofriendly green route was employed for the synthesis ofmixed metal oxide (MMO) nanoparticles i.e., Cu-Cr oxide (CuCr2O4) using Aeglemarmelos (Bael) as a natural surfactant. From FE-SEM analysis the size of nanoparticles was found to be ~50 nm with cubical shape. The synthesized nanoparticles were used as oxidizing agentcum catalyst for the selective oxidation of phenol to benzoquinone. Various reaction parameters were optimized such asconcentration of H2O2, solvent and amount of catalyst.UsingCuCr2O4 nanoparticles as catalyst and water as a solvent, the reaction occurred very quickly i.e. in 5 min.The novelty of this work lies in the fact that green solvent and natural biosurfactant has been utilized for synthesizing MMO nanostructuresalong with best results for the oxidation of phenol obtained using water as a solvent.
S. P. Wadkar, Shubham S. Mahajan, Shubham S. Kale, NirajShende, MrunalKudale
There are many vital diseases which if not diagnosed properly in a certain time would cause the disease to reach to a vital stage and affect the condition of a patient or may even cause death. Moreover the equipment required for the diagnosis is large and thus makes the process cumbersome. A device is developed which would reduce the equipment and time required for the same. This device is be portable and inexpensive and reliable enough to detect the diseases easily. The basic idea is from the lab-on-a-chip technology based on microfluidics where microfluidic channels are made and simulated for the flow of a fluid so as to achieve the purpose. There are various configurations possible for the considered device. Some configurations are analyzed to find out the optimum configuration for the diagnosis of blood using CFD technique.
Electrical Impedance Tomography (EIT) is an imaging technique of conductivity distribution in a close object. A low alternating current at high frequency is applied to a closed object through pair of electrodes. The resulting voltages at remaining pair of electrodes are measured on the surface. The current –voltage distribution relationship is determined by Poisson’s or Laplace’s equation with given boundary conditions. An inside electrical resistivity/ conductivity distribution can be obtained for a closed object using an appropriate image reconstruction algorithm. In this context an algorithm based on Finite Difference Method has been developed and discussed in detail. The software will create meshes, nodes for the given numbers of boundary voltages. The resultant pixel intensity of a mesh will be calculated by direct / iterative method.
This paper is discussing about the various benefits of meditation in physical activities and health. These include more focused concentration, less fatigue, less depression, less distractions etc. This paper summarizes the effects of meditation on mental health. This also helps in refinement of the state of mind which leads to repairmen of the body. Mental calmness and peace acquired through meditation results in handling of situation appropriately.
This paper presents a fast and efficient technique for removal of line overload contingency using generation re-dispatch. Identification and filtering of cascading line contingencies are performed with the help of Line Outage Distribution Factors (LODF) and Generation shift Distribution Factors (GSDF). Sensitivity of each line of the system with respect to the generators as well as other lines are used to determine the changes in the generation, which is to be made without any cascading overloading problem. The technique uses Linear Programming optimization algorithm for solving the objective function and its constraints. The approach presented in this paper is very simple and has minimal computational expenses. Unlike other algorithms and iterative techniques used in other papers, this technique will give a very clear and accurate decision making solution to the power system operator in issues of load dispatch during overloads. The effectiveness of the technique in elevating line overload in IEEE 14 bus and 30 bus are investigated. The results demonstrate the ability of the technique to effectively bring rated loading to every line in the power system after the corrective re-dispatch action.
N. H. Mohamad Nor, M. H. Ismail, M. A. Yahaya, J.B. Saedon
This study was aimed to fabricate porous Ti-6Al-4V structure through Metal Injection Molding (MIM) technique using palm stearin (PS) binder system. Titanium alloy powder (Ti-6Al-4V) was used to mix with sodium chloride (NaCl) as a space holder and binder components that consists of palm stearin (PS) as a primary binder and polyethylene (PE) as a backbone binder.The density of the sintered part were resulted from tremendous densification of the sample. Sintering parameters have been optimized using Taguchi method of L9 (34) orthogonal array. The result from Taguchi method, combination of A2, B2, C1 and D1 as the best set of factors. This means that the sintering temperature at 1300oC; sintering duration, 120 min; heating rate 4oC/min and cooling rate 9oC/min were the optimum level that could statistically result in produce highest density of porous. The analysis of variance (ANOVA) was employed to determine the significant level (α) and its contribution to the variables of the final density. The study demonstrated that sintering temperature was the most influential variable contributed to the best final density, followed by sintering duration, cooling rate and heating rate.
This research provides a novel framework to monitor the performance of the Original Equipment Manufacturers (OEMs) supplying ancillary products to a manufacturing firm by evaluating and categorising OEMs using fuzzy decision making and cluster analysis techniques. Monitoring of a firm's OEMs is essential for it in order to achieve competitive advantage and align its capabilities and performances with the desired objectives. Various decision making approaches have been proposed in the literature to select and evaluate new suppliers. However, evaluation and encouragement of current suppliers has not been addressed so far in the open literature. In this work an exploratory study is carried out to develop a methodology for categorising the OEMs of a sample firm by first obtaining their performance scores and then grouping these values into clusters. The sample organisation selected for this purpose is one of the leading automobile manufacturing firms of India. Twenty vital OEMs were evaluated against twelve generic criteria using Fuzzy Analytical Hierarchal Process (FAHP) and Fuzzy Technique for Order of Preference by Similarity to Ideal Solution (FTOPSIS) to obtain the performance priority scores. Distance based dynamic clustering technique, using small data set and K-mean clustering method were then applied to obtain taxonomy of the OEMs. After determination of priority scores of OEMs, three taxons were obtained and labelled as "Prominents", "Intermediators" and "Marginals". These three groups illustrates the manufacturing strengths and weaknesses of the twenty OEMs of the firm on the basis of the attributes. Hence three different strategies can be formulated by the management to improve the effectiveness of its supply chain management.