October 2012

Angiotensin converting enzyme insertion /deletion polymorphism in angiographically proven coronary artery disease subjects of South India

The prevalence of Coronary artery disease (CAD) varies epidemiologically among different population. Environmental and genetic factors play an important role in the pathogenesis of CAD. Angiotensin converting enzyme (ACE) insertion/deletion polymorphism has an effect on the pathogenesis of CAD, through angiotensin II mediated mechanism. In the present study, we have evaluated the association of insertion/deletion...

Author(s): B. Phanikrishna, K. Ramalingam, B. Sowjanya and C. Bhaktavasthala Reddy

October 2012

Experimental analysis of the tool-to-workpiece vibrations transmission during chatter development in milling processes

An experimental work to analyze the mechanical vibrations that arise during chatter development in milling processes was conducted. The tool vibrations and the frequencies that are excited at the workpiece due to the tool impacts were studied for various levels of chatter. Tool vibrations were measured with an inductive sensor, while the workpiece vibrations were measured with an accelerometer. The relevance of the...

Author(s): Eduardo Rubio

October 2012

An oscillation discovery of the forced vibrating system predicted by the multi-time differential equation

In this article, an experiment of the forced oscillating pendulum system was set up. Here, a pendulum is driven sinusoidally by the loudspeaker. From this experiment, the spectrum of output signal of a Hall-effect sensor (UGN3503) which is used to transform the oscillatory motion of the pendulum into an electrical signal, exhibits four sharp frequency peaks, and it is also found that two of these frequency peaks cannot...

Author(s): Kriangsak Prompak, Anucha Kaewpoonsuk, Thongchai Maneechukate and Paramote Wardkein

October 2012

Acute toxicity test of Zn, on Java medaka (Oryzias javanicus) fish as an indicator of estuary pollution

The acute toxicity of Zn on Java medaka (Oryzias javanicus) fish was studied. To obtain the results, the experiments were carried out in 3-liter aquariums (15 to 20 fish for each aquarium) with static condition based on O.E.C.D method with 5 treatments, and 1 blank in two repetitions. During the experiment, water physico-chemical factors were pH = 7.7 to 7.9, salinity = 19.3 to 19.7 p.p.t, temperature = 29.1...

Author(s): Khodadoust Daryoush and Ahmad Ismail

October 2012

Development and testing of an intelligent hybrid polymeric composite beam embedded with Ni-Ti shape memory alloy with crack growth retarding ability

Hybrid Polymeric Composites (HPC) structural materials pose a challenge of developing microcracks and delaminations under impact and dynamic loads. This paper presents the development and testing of an Intelligent Hybrid Polymeric Composite (IHPC) beam embedded with Ni-Ti Shape Memory Alloy (SMA) with crack growth retarding ability. Upon heating to austenite finish temperature (Af), Ni-Ti SMA wire contracts as a result...

Author(s): W. M. Mwita and A. N. Mtawa