Natural convection mass transfer in presence of small amounts of alcohols

The effect of methanol, ethanol, n-propanol and isopropanol on the rate of cathodic deposition of copper from acidified copper sulfate solution was studied. These alcohols caused a decrease in the limiting current by an amount ranging from 5.95 to 35.55%, depending on the type of alcohol and concentration. Langmuir adsorption isotherm was applied. The values of heat absorption and free energy of adsorption were calculated

Cinnamic acid derivatives as inhibitors for dissolution of copper in phosphoric acid

Inhibition of anodic dissolution of copper in 10M H3PO4 by cinnamic acid derivatives has been studied by measuring the anodic limiting current. The results revealed that the inhibition process was dependent on the nature of substituent in the p-position of the aromatic ring and ranged from 4 to 64% according to the type and concentration of inhibitors. The activation energies for dissolution reaction in the presence of inhibitor and their use in predicting the rate of diffusion-controlled corrosion in practice have been studied

Evaluation of thermal hazard of azobisisobuty ronitrile using acicular assign rate calorimetry

The thermal decomposition of Azobisisobutyronitrile [AIBN] has been studied under fully adiabatic conditions in a sealed bomb using an accelerating rate calorimetry technique [ARC]. Data relating temperature, pressure and time has been generated. AIBN decomposes exthothermally and the onset of the decomposition occurs at 56.19°C. The reaction reaches its maximum at 112.28°C. During this temperature range, the self-heat rate, and the time to maximum rate of the reaction were evaluated. The experimental data has been also treated to evaluate the activation energy of the potential runaway reaction

Fixation of femoral neck fractures by AO cancellous screws

In this paper we report a series of 38 femoral neck fractures that were treated by closed reduction and internal fixation with multiple AO cancellous screws. At a mean follow up of 29.8 months, the results were satisfactory in 28 patients [73.7%] and unsatisfactory in 10 patients [26.3%]. Complications included non-union in 4 cases [10.5%], avascular necrosis in 5 cases [13.2%] and segmental collapse in one case [2.6%]. We concluded that osteosynthesis of femoral neck fractures with AO cancellous screws is an easy procedure that affords rigid fixation and relatively low incidence of complications and at the same time utilizes cheap implants and demands an average level of training. While better results were obtained in undisplaced fractures [Garden Stage I and II], and in fractures with good quality of postoperative reduction, age did not appear to be an important factor in outcome

Intra-articular aprotinin versus steroids in osteoarthritis of the knee

The results of intra-articular Injection of aprotinin and corticosteroids have been assessed by a double-blind trial design in 32 symptomatic osteoarthritic knees. Aprotinin produced a better and longer-lasting symptomatic relief than steroids. Whereas steroids are used only for symptomatic relief in osteoarthritis, aprotinin may in addition effect a genuine cure of the diseased joint through inhibition of the proteolytic enzymes responsible for carticlage breakdown