Dynamic Analysis of High Frequency Vibro-Impact Drilling

Vibro-impact drilling system modelling is a research and results of the selected models which is more complex model known as three mass model. As we know that this model is invented to prove the dynamic relationship between the drilled formation and drill bit. The static force, excitation frequency and the excitation amplitude is the main three main control parameters. The investigation ensures that rate of progression is varied by the three main parameters. Higher the static force and excitation amplitude, the best progression rate can be achieved. Thus, in this case, the static force is linear with excitation of amplitude. However, the lower value of excitation and increases in excitation of frequency with the decrease in static force, the result shows zero progression rate. Thus, this concludes the zero progression rate at higher excitation frequency for this models. As based on analysis, the model uses the resonance enhanced drilling (RED) technique for forming resonance state by using the adjustable high dynamic stress to improve the rate of progression. The simulation for the vibro-impact drilling motion is obtained by solving the equation of motion using MATLAB software

Study on Cost of Procuring Chilled Water from District Cooling System (DCS) Against Constructing an In-Building Chiller Plant for an Office Tower

A financial feasibility study on the cost of procuring Chilled Water from a District Cooling System (DCS) Plant versus the cost for Constructing, Owning, Maintaining and Operating a Conventional In-Building Electric Water-Cooled Chilled Water Plant was carried out. The Building is a 35 storey office building located in Kuala Lumpur. The Chilled Water Supply from the DCS Plant is envisaged for 24 hours daily for a period of 25 years. The Supply Temperature shall be 6.5 ± 0.5 ºC and the Differential Temperature ?T shall be 7 ºC. Using A simple payback period calculation, it was found that the provision of a In-Building Chilled Water System is more economically favorable than procuring Chilled Water from a DCS Plant

Effect of Statin Therapy on Serum Lipase and Blood Glucose Levels in Patients with Hyperlipidemia

Hyperlipidemia is an abnormality in the lipoprotein metabolism that leads to alterations in the various lipoproteins and the prevalence was 37.5% in age group of 15 - 64 years. Hypercholesterolemia was identified to be the risk factor for coronary artery disease and cerobrovascular disease. Statins are the hypolipidemic drugs which helps in lowering the blood cholesterol and lipoprotein levels that acts by inhibiting the 3-Hydroxy-3-methyl glutaryl coenzyme A [HMG-CoA] reductase enzyme. Apart from various adverse effects mentioned in textbooks, there were case reports mentioning that statins can be a cause for the development of acute pancreatitis [AP], where there was an elevation in the levels of serum lipase, serum amylase and blood glucose. Hence, it was hypothesized in this present study that, statin therapy in hyperlipidemic patients increases the levels of serum lipase and blood glucose Three months of treatment with atorvastatin or rosuvastatin significantly increases the levels of serum lipase and blood glucose when compared with the base line

Dynamic Analysis of High Frequency Vibro-Impact Drilling

Vibro-impact drilling system modelling is a research and results of the selected models which is more complex model known as three mass model. As we know that this model is invented to prove the dynamic relationship between the drilled formation and drill bit. The static force, excitation frequency and the excitation amplitude is the main three main control parameters. The investigation ensures that rate of progression is varied by the three main parameters. Higher the static force and excitation amplitude, the best progression rate can be achieved. Thus, in this case, the static force is linear with excitation of amplitude. However, the lower value of excitation and increases in excitation of frequency with the decrease in static force, the result shows zero progression rate. Thus, this concludes the zero progression rate at higher excitation frequency for this models. As based on analysis, the model uses the resonance enhanced drilling (RED) technique for forming resonance state by using the adjustable high dynamic stress to improve the rate of progression. The simulation for the vibro-impact drilling motion is obtained by solving the equation of motion using MATLAB software

Molecular dynamics simulations of structural transformation of perfluorooctane sulfonate (PFOS) at water/rutile interfaces

Concentration and salinity conditions are the dominant environmental factors affecting the behavior of perfluorinated compounds (PFCs) on the surfaces of a variety of solid matrices (suspended particles, sediments, and natural minerals). However, the mechanism has not yet been examined at molecular scales. Here, the structural transformation of perfluorooctane sulfonate (PFOS) at water/rutile interfaces induced by changes of the concentration level of PFOS and salt condition was investigated using molecular dynamics (MD) simulations. At low and intermediate concentrations all PFOS molecules directly interacted with the rutile (110) surface mainly by the sulfonate headgroups through electrostatic attraction, yielding a typical monolayer structure. As the concentration of PFOS increased, the molecules aggregated in a complex multi-layered structure, where an irregular assembling configuration was adsorbed on the monolayer structure by the van der Waals interactions between the perfluoroalkyl chains. When adding CaCl2 to the system, the multi-layered structure changed to a monolayer again, indicating that the addition of CaCl2 enhanced the critical concentration value to yield PFOS multilayer assemblies. The divalent Ca2+ substituted for monovalent K+ as the bridging counterion in PFOS adsorption. MD simulation may trigger wide applications in study of perfluorinated compounds (PFCs) from atomic/molecular scale

EFFECT OF POLYCHROMATIC LOW ENERGY X-RAY ON MICROORGANISMS AND BIOACTIVE COMPOUNDS OF BIRD'S NEST AND CARDAMOM

Master'sMASTER OF SCIENC

Interaction of ethylene glycol–water clusters with aromatic surfaces

The gas phase geometries of ethylene glycol–water (EGmWn(where m = 0–4, n = 0–4; m + n ≤ 4) clusters adsorbed on a fragment of carbon nanotube have been investigated using density functional theory based M05-2X and ωB97XD methods employing various basis sets. With a view to assess the effect of curvature on the hydrogen bonding pattern between ethylene glycol and water molecules, calculations on intermolecular complexes comprising a planar aromatic surface and EGmWn clusters have been carried out. Results obtained from the electronic structure calculations and Bader's electron density analysis reveal that C–H⋯π, O–H⋯π and lone pair⋯π interactions are predominant in the stabilization of EGmWn and the corresponding complexes with fragments of a carbon nanotube and graphene. Further, the role of the π-cloud on the stability of EGmWn is illustrated by comparing the interaction energies of clusters in the presence and absence of an aromatic surface