DIYALA JOURNAL OF ENGINEERING SCIENCES

Low melting metals like zinc used in this research to promote increasing of diffusion process with presence of pure powder of copper., this metals have good corrosion resistance in chemical and environmental conditionsby making thin film to hardening surface of rod of stainless steel18/8Ni-Cr under heat treatment condition at 890cabove eutectic line to reached austerity zone and under this line at 0,600c to obtained re-crystallization annealingand 400c0 at sufficient time 90min. chemical composition ,hardness ,micro-hardness ,and micro structures were investigated to track the effectiveness of diffusion zinc-copper melting in different s points

Spent catalyst from Biji Refining contained valuable metals such as platin. This study focus on platinum extraction in aqua regia solution. Three factors effecting on the process were study including dissolution temperature, normality of aqua regia and agitation speed. The ideal conditions for process give 0.22gmplatinum extractionin dissolution temperature 80 C0, normality for aqua regia was 6 and 120 rpm mixing speed for solution.

In this paper,the neural network (NN)is used to control the remote IP address that related to user device. When the IP address assigned carefully and controlled by a novel tool, the work performance and service quality will be better. The input for the NN determined depending on the repeated problem in recent networks and the available parameters which are in the main server node. The training process done by determining the required training function and activation function for allneurons in the NN. The performanceof theproposed method was (1*10-20) or less in more casesand the error of the learning process is nearly (1*10-6). In addition to IP address control, the proposed method is a good manner to optimize the security issue by specializingan IP address for a given user that can't be used by other device. Finally, the NN subject the produced IP address for the given users for test and validation which reached to the goal at smallest time (~0.0001s) and little number of iteration (9 -20) epoch.

Home automation becomes important, because it gives the user convenient and easy method to use home appliances. This paper aims to help people with special needs or physical disabilities and injuries by paralysis to control any device using infrared technology using voice commands based on the voice recognition system (voice recognition unit V3) system can recognize voice commands, convert them to desired data coordination and data transmission via IR transmitter and microcontroller (Arduino Uno) Receiving this signal by IR sensor to control TV receiver then get a full remote control that works by voice commands. The software consists of a Micro C language programmable microcontroller. This system is of low cost and flexible with growing variety of devices that can be controlled.

Powder metallurgy technique utilized in samples preparing. Samples were compacted by using cold uniaxial pressing then followed by sintering process at600oC under inert gas.Results showed improving in (Brinell Hardness,wear resistance & compression strength) and increasing in (density, porosity & water absorption).Brinell Hardness increasing (106. –114.7),compression strength increasing (35.1 –40.8) N/mm2and decrease wear rate (6.6*exp(-8) –4.22*exp(-8)) g/cm at time 30 min. with (0 –20)% Al2O3&B4C. While increase apparent density (2.76 –2.83) g/cm3, Bulk Density increase (2.71-2.82) g/cm3apparent porosity decrease (1.88 –0.193) % and water absorption decrease (0.699 –0.068) % at (0 –20) % Al2O3&B4C

Thecurrent work is the study of corrosion behaveior of carbon steel, in naturally aerated (3.5%wt NaCl) solution. A rotating cylinder electrode (RCE) system wasused to produceconditionsof turbulent flow,polarization experiments were conductedat various temperature andvariousrotating speed at each temperature.Similar experiments were carried out using CO2gas at (32 ml/sec) flow rate.Corresponding experiments by weight loss were carried out in (3.5%wt NaCl) solution withKerosene + 10% V salt solution and Gas oil + 10% V salt solutionat 328k and (0, 400) r.p.m .Similar experiments were carried out in kerosene + 10% V saltsolution at (298, 308 and 318)K and rotating speed (0) r.p.m at each temperature.Other experiments were carried out in pure kerosene at temperature (298 and 318)K and speed (0) r.p.m.All experiments were carried out with and with out CO2 gas .The results indicate that the corrosion rate of carbon steel is increasing 70%with CO2 gas.

Highly pure and crystalline CdSxSe1 -x nanostructures have been successfully synthesized via Chemical Vapor Deposition(CVD) method, changing the components of x, inorder to adjust the band gap of materials, and the relationship with the lattice constant. Using X-ray Diffraction(XRD) to characterize the phase structures and elemental compositions of the samples, and using Field Emission Scanning Electron Microscopy (FESEM) to observe the surface morphology of CdSxSe1 -x nanomaterials and confirm the VLS growth mechanism. Using the High Resolution Transmission Electron Microscopy (HRTEM) and Selected Area Electron Diffraction (SAED) to analyze the crystal structure and the growth direction of the materials

Population growth and irregular migration to urban centres in a manner inconsistent with what is planned and the reality of the master planof the city of Baquba one of the main causes of the problems of housing violations and their impact on the environment of the city, Where the agricultural areas were bulldozed for the purpose of transforming them into residential areas, exacerbating the city's problems in meeting the public services. The research includes firstthe causes of the violations on the master plan and secondlythe areas exceeded and thirdlythe effects of the repercussions and problems resulting from the urban society of the city as a result of this overrun and proposed solutions to modify the master planto accommodate these abuses and the development of the new master plan forthe future residential expansion and development and modification of the master planof the city to meet the requirements Urbanization.

With the growing of artificial intelligence and the usage of sound commands the needs for a high accuracy speech recognition increases. Many researches are done in this area using different kinds of methods and approaches. In this research twoalgorithms have been introduced. The autoregressive system identification and the FIR Wiener filter. The objective of this research is to show the robustness of system identification in terms of speech recognition.Both algorithms have been implemented and tested using MATLAB where the process is done by recording full sentences from different subjects under two conditions which are clear and noisy background. For each sentence, it has been recorded two timesfor each subject; the first one was used for testing and the second sentence was used for validation. The results show that both algorithms are giving an accurate prediction when the used data are from the same subject with clear background. The advantage of system identification over the Weiner filter is shine when using noisy signals. Another advantage of using system identification for speech recognition is it can distinguish the sound difference when same sentence from different subjects is used where the Weiner filter in some cases passes them as from the same subject. This could be a huge issue if the algorithm is used for security reasons.

This research is concerned with study of the effect heat treatment and the bake hardening process on dual phase steels which can be obtain by intercritical annealing process. Hardness, microstructure and tensile specimens were prepared according to standards.Usedspecimens was with different carbon content (0.12, 0.096 and 0.064). The normalizing heat treatment was conducted on low carbon steel, to remove the effect of the previous manufacturing processes. Intercritical annealing was used as a heat treatment to obtain the dual phase steel, the carbon steel was quenched from760 ºC this temperature lies between the critical points. It has been found that after intercritical annealing process has transformation accrue from pearlite structure resulting from the normalization process to a new structure contain ferrite and martensite. The hardness of dual-phase steel obtained by intercritical annealing is higher than of the steel that was normalized as well as the carbon content of the steel affects the hardness. Tensile test results showed that the ultimate tensile strength and yield strength increased after intercritical annealing process compared to other specimens were normalized ,content of carbon also effect on the ultimate tensile strength and yield point. The dual phase steel is characterized with no visible yield point due to the dislocations movement are restricted. Dual phase steel yield point re-appear after pre-strained at 3, 5, 8, 10%., and baked to 170 ° C. The ultimate tensile strength and the yield point for the pre-strained and baked specimens were higher than the other tensile specimens which conducted with normalizing or intercritical annealing only due to the diffused carbon atoms that pin dislocations and prevent it is movement. Baking process is affected by several factors such as carbon ratio and the amount of prestrain. It is found that when carbon content increase, the number of diffused carbon atoms will increase. Amount of pre-strain effect on the mechanical properties after baking process, where it was found that when the mount of pre-strain increase the ultimate tensile strength and yield point stress will increase.

This work deals with investigating the capacity of high strength columns, under axial compression loads. A total of nine circular column with 600 mm length and 150 mm outer diameter were tested, three of them were solid as a reference, the remaining six columns were with internal hole of 50 and 75 mm dimeter. The effect of hole size as well as area of longitudinal steel reinforcement was studied.Area of steel used where 0, 301 and 471 mm2and two hole size were 50 and 75 mm. The results showed that the increasing of longitudinal reinforcement ratio from 0 % (plain) to 2.67% (steel reinforcement area of 471 mm2) for solid column cause an increase in the ultimate strength by 33.6%, while for hollow columns with 75 mm internal hole the ultimate strength increased up to 33.2 %. Increase in hole dimeter from 50 to 75 mm caused a reduction of columns capacity in all cause, the decrease was up 33 % for columns with 301 mm2steel area was up to 32 %, for columns with 417 mm2.

A wonderful unique research developments in modeling surface roughness and optimization of the predominant parameters to get a surface finish of desired level since only suitable selection of cutting parameters can get a better surface finish, so the objective of this work is to study the milling process parameters which include tool diameter, feed rate, spindle speed, and depth of cut resulting in optimal values of the surface roughness during machining AL-alloy 7024. The machining operation implemented on XK7124 3-axis CNC milling machine. The effects of the selected parameters on the chosen characteristics have been accomplished using Taguchi’s parameter design approach. The parameters considered are –depth of cut with two levels (0.2, 0.5 mm), tool diameter with two levels (6, 8 mm), spindle speed with two levels (1000, 2500 rpm), and finally feed rate with two levels (200, 500 mm/min). Analysis of the results showed that the optimal settings for low values of surface roughness are large tool diameter (8 mm), high spindle speed (2500 r.p.m), low feed rate (200 mm/min) and high depth of cut (0.5 mm). Response Table for mean of surface roughness showed that tool diameter has the most effected factors (rank one) followed by feed rate (rank two) then depth of cut which is the third effected factors and finally spindle speed with the less effected factors of surface roughness (rank four).