Oxygen transfer through a cotton plug follows Fick's law of diffusion. The apparent diffusion constant decreases as the density of cotton packing is increased. Formulas are derived which relate oxygen transfer to cotton-plug dimensions. Calculations indicate that the dimensions of a cotton plug can affect both the maximal oxygen uptake rate and the gas composition inside a shaken flask. In some...

Alkaline hydrolysis of ethyl acetate is essentially an irreversible and second order reaction. Industrial importance of the reaction product, sodium acetate, necessitate for process improvement in terms of maximum conversion and economical usage of raw materials. Statistical design of experiments was utilized to enhance conversion in both batch and plug flow reactors.A full two level factor...

lead, cadmium, mercury and arsenic are the most important heavy metals which may cause health risks following consumption of contaminated foods. table salt is one the mostly used food additive with unique place in food consumption. although purified table salt is expected to have lower level of contamination, some iranians still prefer to use rock salt. use of rock salt for food purposes has be...

plug-flow digesters with periodic loading mechanism are more enthusiastic than fully mechanized digestion plants for the majority of small or medium scale farms according to the costs and operational complexities. a dual-compartment plug-flow reactor equipped with a passive heating system was designed and experimentally operated by purpose of demonstrating a simple and low cost technology for h...

A typical heavy-duty diesel fuel injector comprises of a solenoid control valve, a plunger cylinder and a fuel passage linking the first two elements. Through this passage a fuel communication is established where the fuel is delivered into the plunger cylinder via control valve. The plunger pressurizes the fuel in excess of 32,000 psi and the high-pressure fuel is injected through spray nozzle...

Two mathematical models of vacuum aspiration, being a method widely used in various branches of medicine, are considered. In particular, vacuum aspiration is an effective method of prostatitis therapy. The purpose of vacuum aspiration in this urological procedure is to destroy the plug, which clogs up the ill acinus. We analyze plausible physical mechanisms of purification of prostatic acini an...

This paper presents a low-cost and flexible solution to control and monitor home appliances using Smart Plug devices. The Smart Plug is a power switch which can be accessed via WiFi connection. It integrates two temp sensors, a current sensor and an IRemitter. Users can plug devices into the Smart Plug to remotely switch power on/off, get information of device’s power consumption and ambient te...

BACKGROUND Punctal plugs are used for the treatment of tear-deficient type dry eye. We recently examined a case of acute conjunctivitis associated with bacterial biofilm formation on a punctal plug. CASE A 63-year-old woman diagnosed as having tear-deficient type dry eye came to our hospital with a complaint of soreness in her right eye. Punctal plugs had been inserted into this eye 5 1/2 mon...

This paper presents the WANDA Workbench, which is an open framework for electronic data processing. The framework provides generic interfaces for ’plugin’ applications for graphical user interfaces (client desktop with client plug-ins) and processing modules (server with server plug-ins). The applied plug-in concept allows for the functional extension of the workbench without changing the frame...