An analytical and experimental study of the behavior of semi-infinite metal targets under hypervelocity impact

The material strength and strain rate effects associated with the hypervelocity impact problem were considered. A yield criterion involving the second and third invariants of the stress deviator and a strain rate sensitive constitutive equation were developed. The part of total deformation which represents change in shape is attributable to the stress deviator. Constitutive equation is a means for analytically describing the mechanical response of a continuum under study. The accuracy of the yield criterion was verified utilizing the published two and three dimensional experimental data. The constants associated with the constitutive equation were determined from one dimensional quasistatic and dynamic experiments. Hypervelocity impact experiments were conducted on semi-infinite targets of 1100 aluminum, 6061 aluminum alloy, mild steel, and commercially pure lead using spherically shaped and normally incident pyrex projectiles

An Experimental Study on Black Cotton Soil Stabilization by Using Terazyme

In developing countries like India the most important requirement of any project after performance criteria is its economical feasibility and serviceability criteria. The conventional methods are time consuming and are not economically feasible. Hence there is a need to find the other possible ways to satisfy the performance as well as economical criteria. These enzymes have been proven to be very effective and economical. Another advantage of the bio-enzyme is that these are environment friendly. The efficiency of bio enzyme depends upon the amount of dosage, type of soil and curing period. In our country vast areas consist of black cotton soils. As the conventional soil stabilizers like gravel, sand and others are depleting and becoming expensive day by day at a very rapid pace, it becomes necessary to look towards for alternative eco-friendly stabilizers as their substitute. Recently many Bio-enzymes have emerged as cost effective stabilizers for soil stabilization. One such type of bio-enzyme, Terazyme, has been used in the present work. The Terazyme effect on the unconfined compressive strength and on the atterberg limits were studied. The enzyme treated soil showing significant improvement in unconfined compressive strength values. The untreated soil has compressive strength as 71 kN/m2. After treating with Terazyme the soil showed significant improvement in strength. With curing period, the strength is increasing. The strength increment was found to be 300 percent. No significant improvement in liquid and plastic limit values with treatment of Terazyme enzyme. The compression index and coefficient of consolidation values decreasing with enzyme treatment for a prefixing curing period

A Design & Evaluation Framework for Setting Up a Community of Practice

In the recent years, there has been a tremendous amount of exposure of Knowledge Management (KM) and value creation. Organizations are beginning to understand the need to capitalize all the available information, tacit and explicit, as most of the organizations are operating in a global and competitive economy. One such organizational concept that can capture both tacit and explicit knowledge is Communities of Practice. Communities of Practice (CoPs) are seen as a mechanism for knowledge sharing and learning across and within institutions, based on the common ground of a professional discipline, a skill, a topic, or a business process. Although CoPs have been receiving much attention recently and could play a critical role in knowledge sharing, it is very important for organizations to find out if it is viable before they invest their time and money in building it. The objective of my research is to layout the frameworks for designing and evaluating CoP’s before launching them. The research is carried out through an in-depth study on a Community of Risk and Control Self-Assessment (R&CSA) facilitators at International Financial Services (IFS). The practical goal is to identify and prototype some of the key Community of Practice processes for the R&CSA approach. The design framework can lead the coordinator through a series of steps to gather the requirements in a short amount of time. The evaluation framework will measure the outcome and tell us if launching a CoP is desirable

Phytochemical evaluation and pharmacological screening of ethanolic and aqueous leaf extracts of Pupalia lappacea for antihyperlipidemic and antihyperglycemic activities in alloxan induced diabetic Albino wistar rats

Background: Diabetes is associated with damage to the liver, pancreas and kidney. The damage may vary among patients. This study assessed the hypoglycaemic and antihyperlipidemic activities of leaves ethanolic and aqueous extracts of Pupalia lappaceae in alloxan induced diabetic albino wistar rats.Methods: There were Fifty four rats divided into nine groups containing six rats each. Group 1 consists of normal rats that were given only normal saline and served as a control group. Group 2 consists of normal rats that were given alloxan monohydrate (150mg/kg b.w). Group 3 consists alloxan induced diabetic rats that were given daily sterile solution. glibenclamide+simvastatin (5mg/kg) Group 4 consists of alloxan induced diabetic rats that were given daily sterile solution, AEPL extract (100mg/kg). Group 5 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract AEPL (200mg/kg). Group 6 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract AEPL (400mg/kg) Group 7 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract EEPL (100mg/kg), Group 8 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract EEPL (200mg/kg) Group 9 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract EEPL (400mg/kg respectively for 21days by an intragastric tube with free access of food and water.Results: Chemical composition of the plant was estimated by GCMS technique several biochemical parameters were assessed. Oral administration of the extract resulted in significant reduction in mean values of blood glucose, triglycerides, total cholesterol, cholesterol ratio, LDL, VLDL, accompanied by increase in the mean value of the HDL in diabetic rats and histopathology of liver, pancreas, and kidney showed significant changes.Conclusions: The effects produced were closely similar to standard antidiabetic and antihyperlipidemic drug. It can thus be concluded that the ethanolic and aqueous extract of Pupalia lappaceae exhibit antihyperlipidemic and antihyperglycemic activities in alloxan induced diabetes in rats