ABSTRACT This study investigated the corrosion resistance of Nickel and Gold plated carbon steels ornamentals in 0.5rno~dd Suphuric acid (&SO4) medium. Nickel plating of carbon steel ' was done in watts solution for 25 minutes with a current density of 3 Aldrn3 at 60°C. The nickel plated carbon steel was later gold plated for 20 minutes with a current density of 0.2 A,ldm3 at 50°C . The plated and unplated carbon steels were exposed to environment for 15 days. The weight loss was taken eve...
Abstract A survey involving the use of questionnaires and personal communication during field trips was carried out in Western Nigeria with the aim of classifying and assessing the efficiency of the existing structures for the storage of crops. Barns; cribs; trenches; platforms; warehouses and silos are among the important. storage structures. The existing structures could be efficient with proper management but a major limitation of most of them is the low unit capacity which is inadequate t...
ABSTRACT Low carbon steel metal is used for the manufacture of nails. Steel wire with
ABSTRACT We have been using polycrystalline thin films of anhydrous cadmium chloride (CdCI2) as an electron beam positive resist for the fabrication of features in SO2- coated silicon wafers The kinetics and mechanism of the electron-beam-induced decomposition of CdCI, which is the resist reaction, have been studied in details this work required that we know the thickness and density of the film. In the ordinary way of things, film thickness and density determination is a routine matter, but ...
ABSTRACT This paper presents the design of a central air-conditioning/ducting system for a case study of a University Senate Chamber in Nigeria. The design aims at maintaining conditions that are conducive to human comfort within the senate chamber of the University (24OC-25.5OC, 50%-55% RH). The design month was March (6) and using the expert assistance found in the carrier system design ducting analysis manual the refrigeration tonnage obtained was 40 and the total air quantity required to ...
ABSTRACT The high cost of purchasing good quality flexible polyurethane foam called for this project work, which examines the possible reduction in the cost of production which will eventually lead to reduction in all overall market cost. Process optimization technique was adopted using gradual chemical variance method for the foam surfactant (silicone oil) to locate the optimum silicone oil quantity required as against the usual practice of ipart of silicone oil to 100 part of polyol for 20...
ABSTRACT The different options involved in cam systems design such as types of cams and followers, number of applicable standard cam functions, divisions of follower motion-segments, and possible combinations of follower displacement profiles, among others, were critically studied to determine the structure and capabilities of a software package suited for extensive design analyses. The software was applied in the design of cam profiles with selected follower and cam functions and the result...
ABSTRACT Empirical correlations for Nusselt number (Nu) in a staggered multi-row multi-column cross-flow, tube-type heat exchanger is presented in this paper. In the experiment, air at ambient banks of cylindrical rods arranged in staggered configuration of 5 rows by four columns. A test element consisting of a tube of pure copper with length internal and external diameters of 0.125, 0.0115 and 0.0125 m was heated to a maximum temperature of about 90Oc and inserted into the air stream in the ...
ABSTRACT This work experimentally determines crop water requirements as well as effects of varying irrigation schedules on growth parameters of Celosia Argentea. Irrigation treatments of refilling the soil back to 100%fc, 75%fc and 50%fc were applied to predominant three soil samples from different locations within the South Western part of Nigeria having the same sandy loam textural class. Irrigation application was based on daily maximum crop evapotranspiration. Leaf Area, Number of Leaves...
Abstract A flat-type, 60-egg capacity incubator was designed, constructed and tested. The incubator differs from existing designs in that the cabinet was made from a 3-ply, 4mm thick interior grade plywood to reduce cost and at the same time enhance heat insulation. Also, two domestic kerosene lanterns were provided to supplement heat generation by three 40 W electric bulbs during electricity outages as commonly experienced in Nigeria. When tested with 30 eggs of a commonly sold chicken bre...
Abstract Selection of optimum machining parameters is an essential factor in process planning for efficient metal cutting operations. In this study, an artificial neural network- based tool wear predictive model and a genetic algorithm-based optimization model were developed to determine the optimum cutting parameters for turning NST 37.2 steel with uncoated carbide cutting inserts. Multi-layer, feed-forare, back -propagation network was used in predictive model, while maximum metal removal r...
ABSTRACT The e-beam stimulated reaction, CdCI2(s) ---> Cd (s) + CI(g), has been studied in casmium chloride thin films between 303 and 483 K using 2-keV electrons. The dose required to make 90-nm-deep holes at 483 K is 3x10-3 C cm -2. Extrapolated dosing levels of 6x10-5 C cm -2 are expected. The use of CdCI2 as a positive-type electron resist in a new scheme is proposed. A working model, useful for considering the e-beam stimulated decomposition energetics and mechanism is briefly discussed.
Abstract Several procedures have been proposed to overcome various challenges of product-content analysis after manufacturing and downstream automatad recycling pmcesws. These procedures have been restricted by factors such as the inabiiity to determine exactly the physical state of the hidden pm of End-of-Life products. This inhibition among others has rresldted into an explosion of solutions by researchers. This paper presents the initial investigations in the development of imaging softwa...
ABSTRACT Tool wear measurement is of great concern in machining industry, as it affects the surface qualities, dimensional accuracy and production costs of the machined components. The orthodox methods of measuring tool wear are time consuming and limited in accuracy and application. In this study, machine vision system based on digital image processing was developed for measurement of tool wear. The basic components of the system are: a charge coupled device (CCD) camera, PC, Microsoft Wind...
ABSTRACT A framework for condition monitoring approach that uses the sense of smell was investigated to diagnose the faults of plug-not-firing, loss of compression and carburetor faults from the exhaust fumes of gasoline fuelled automobile engine. An electronic nose based condition monitoring hardware and software was developed using the framework to obtain smell prints that correspond to normal operating conditions and various induced abnormal operating conditions. Fuzzy C-means and K means ...