University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Effect of Steel Fiber on The Behavior of Deep Beams With and Without Web Opening
1
19
EN
Ahmed
S. Diab
Ihsan
A. S. Al-Shaarbaf
Sabih
Z.Al-Sarraf
10.30684/etj.29.1.1
This study investigates experimentally the strengthening of reinforced concrete deep<br /> beams using steel fibers. The experimental work could be divided in two parts, the<br /> first part consists of casting and testing six deep beams without web opening and the<br /> second part consists of casting and testing six deep beams with web openings to show<br /> the effect of volume of steel fibers on the behavior of the deep beams with and<br /> without web opening on ultimate load, deflection, with various shear span to depth<br /> (a/d) ratios [variable of clear shear span].On the other hand, the effects of these<br /> parameters on the behavior and capability of deep beams with constant steel fiber –<br /> volume fraction are obtained by using three groups of beams having steel fiber–<br /> volume fractions of 0.0%, 0.5%, 1.0% and studying the effect of the presence of steel<br /> fibers in deep beams with web openings.<br /> The results obtained from the experimental work [solid deep beams and deep beams<br /> with web openings], demonstrate that when the steel fiber volume- fraction is<br /> increased, the ultimate loads are also increased. The effect of steel fibers increases as<br /> the (a/d) ratio is decreased. In addition, the experimental work on deep beams without<br /> web opening showed that when the steel fiber volume-fraction is kept constant, the<br /> ultimate loads are increased as the (a/d) ratio is decreased. On the other hand, the<br /> percentages of increase in ultimate loads become higher as the steel fiber volumefraction<br /> is increased from 0.0% to 0.5% and 1.0%. However, the effect of decreasing<br /> the (a/d) ratio on the ultimate and cracking loads of the deep beams with web<br /> openings was not significant.
https://etj.uotechnology.edu.iq/article_26144.html
https://etj.uotechnology.edu.iq/article_26144_a492f7572fa4a803c2e4ff78093a53f5.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
The Cytogenetic Effects of Crude Ethanol Extracts of Petroselium Crspum Leaves on Bone Marrow In Mice (Mus Musculus)
1
10
EN
10.30684/etj.29.1.15
This study aimed to investigate the cytogenetic effects of ethanol extract<br /> of Petroselium crispum leaves on somatic cells of albino mice Mus musculus.Four<br /> doses (250,500,1000,2000)mgkg were used.Three tests,mitotic<br /> index,micronucleus formation and chromosomal aberration.<br /> Results indicated that the extracts have significant effects p used. which inhibit somatic division in 250 and 500mgkg doses after 21 and 28<br /> days (P<0.05) of treatment by comparison with the control. Ethanolic leaves<br /> extract showed little effect on micronucleus formation and chromosomal<br /> aberration.<br /> It can be concluded that the crude extract of leaves for the above plant can<br /> be used in cancer treatment of cancer since it has the ability in inhibition of<br /> somatic division which has.
cytogenetic effects Petroselium crspum
https://etj.uotechnology.edu.iq/article_27098.html
https://etj.uotechnology.edu.iq/article_27098_7f3b8368e86eb992f9667a5521a34a43.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Operation of Hindiya Barrage Irrigation Using Expert System
11
30
EN
10.30684/etj.29.1.16
https://etj.uotechnology.edu.iq/article_27099.html
https://etj.uotechnology.edu.iq/article_27099_3a5d8a15597dffcafc9631b6200a61a3.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Study of Degradation Effect on Physical Properties of Methyl Orange Doped PMMA
20
32
EN
Mohamad
S
Nahida
J.Hameed Al-Mashhadan
10.30684/etj.29.1.2
The samples were cast as thin film from homopolymer (PMMA) before<br /> and after doping with methyl orange at different concentration. The samples were<br /> exposed to UV-radiation for exposure time within (10-50hr) range. These polymer<br /> systems were evaluated spectrophotometrically for using the UV-detector. The<br /> absorption spectra of UV-irradiated samples showed radiation induced absorption<br /> changes in the wavelength range, which depends on the polymer type and polymer<br /> composites. The increment depends dopant concentration, especially in ultra violet<br /> region in exposed PMMA doped with methyl orange at 6.7×10-2wt/wt<br /> concentration. Decreasing in absorption was found for the cases in which, photo<br /> degradation caused surface damage, i.e. crazes or cracks formation, especially at<br /> ultraviolet region. Calibration curves were drawn at peaks, selected wavelength in<br /> the absorption spectra. The linear regions from the calibration curves were selected,<br /> and dosimeter range was determined from the UV-irradiation sample response. It<br /> was found that PMMA doped with methyl orange at 6.7×10 -2wt/wt concentration<br /> can be use the UV-detector within range (10-40hr) at the wavelength of (300nm)<br /> for its linear response at this range of irradiation.<br /> Morphological investigations for the surface damages caused by thermal and photo<br /> degradation are detected by optical microscope. It is found that the photo<br /> degradation could easily lead to some mechanical surface degradation i. e (crazes<br /> and cracks) formation.
PMMA UV Degradation,Optical properties
https://etj.uotechnology.edu.iq/article_26145.html
https://etj.uotechnology.edu.iq/article_26145_6aeb48ce2c43c0bd1b02cfb69cc07589.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Improving erosion corrosion resistance of medium carbon steel using electro less nickel plating
31
44
EN
10.30684/etj.29.1.17
This research devoted to studying improvement resistance for the medium<br /> carbon steel to erosion corrosion by coated with electro less nickel plating and<br /> used in this coated acid bath (Hydrogen number Ph = 4.5) at deferent<br /> temperature (70,75,80,85,90°C) to obtained deferent deposition rate of coating.<br /> The experimental work test were done using special device which was designed<br /> and manufactured according to [ASTM (G73)] with certain modifications.<br /> Tests were made on corrosion (3.5wt ℅) sodium chloride Nacl solution as sea<br /> water purged with CO2 gas as the corrosive media and 1wt ℅ silica sand was<br /> added as slurry to that media.<br /> After traditional weight losses technique was achieved, it was found that corrosion<br /> rate decrease with increase value of hardness which increase at increase<br /> temperature of coating solution. This indicate improvement corrosion resistance of<br /> metal. Heat treatment were done to coated specimens at deferent temperature<br /> (300,400,500,700,800°C). It was found that corrosion rate decrease at increase heat treatment temperature. This indicate improvement corrosion resistance but at<br /> higher ratio to that before made heat treatment. Smallest corrosion rate was<br /> obtained at temperature 800C°.
https://etj.uotechnology.edu.iq/article_27100.html
https://etj.uotechnology.edu.iq/article_27100_a8a2fe6ee4837a8e9dff64646da1bcac.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Watermarking for Relational Database by using Threshold Generator
33
43
EN
Bashar
Saadoon Mahdi
Yossra
H. Ali
10.30684/etj.29.1.3
Providing ownership on relational database is a crucial issue in today<br /> internet-based application environments and in many content distribution<br /> applications.This paper provides the effective watermarking technique to protect<br /> valuable numeric relational data from illegal duplications and redistributions as<br /> well as to claim ownership,the robustness of proposed system depending on using<br /> new hybrid techniques ,first technique MAC(Message Authentication Code) that<br /> used one way hash function SHA1 ,second technique is threshold generator base<br /> on simple combination of odd number of register and by using secret key in<br /> proposed system. Detecting the watermark neither requires access to neither the<br /> original data nor the watermark. The watermark can be detected even in a small<br /> subset of a watermarked relation as long as the sample contains some of the marks.<br /> The finally stage is the analysis of technique that used, our extensive analysis<br /> shows that the proposed technique is robust against various forms of malicious<br /> attacks and updates to the data
watermark,relational database,hash function,threshold generator
https://etj.uotechnology.edu.iq/article_26146.html
https://etj.uotechnology.edu.iq/article_26146_fe454f8d71bdceeaccdad8feb345f62b.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
The Effect of Using Glass Powder Filler on Hot Asphalt Concrete Mixtures Properties
44
57
EN
Hassan
H. Jony
Israa
Y. Jahad
Mays
F. Al-Rubaie
10.30684/etj.29.1.4
The early use of asphalt for road and street construction began in the<br /> late 1800s, and grew rapidly with the emerging automobile industry. Since<br /> that time, asphalt technology has made strides such that today the equipment,<br /> techniques and materials used to build asphalt pavement structures are highly<br /> sophisticated.<br /> Waste glass has been used in highway construction as an aggregate<br /> substitute in hot mix asphalt paving. Many countries have recently<br /> incorporated glass into their roadway specifications, which had encouraged<br /> greater use of the material. While the use of waste glass as filler in hot mix<br /> asphalt is still not widely experimented.<br /> In this research glass powder is proposed as an alternative to traditional lime<br /> stone powder (Gubraa) and ordinary Portland cement fillers in hot asphalt mixtures.<br /> Where, the effect of using waste glass powder as mineral filler on Marshall Properties<br /> of hot asphalt concrete mixtures is investigated. Nine mixtures with three types of<br /> fillers (lime stone powder, ordinary Portland cement and glass powder) and three filler<br /> contents (4%, 7% and 10% by weight of total aggregate) are investigated.<br /> The main outcome of this research is the possibility of using glass powder as<br /> filler in hot asphalt concrete mixtures. The optimum glass powder content is 7%.<br /> Where it is found that using of glass powder as filler with such replacement leading to<br /> produce asphalt mixture with higher stability (% of increase up to 13%), lower flow<br /> (% of decrease up to 39%) and lower density (% of decrease up to 10%) comparing to<br /> corresponding ordinary Portland cement or lime stone powder mixtures.
https://etj.uotechnology.edu.iq/article_26147.html
https://etj.uotechnology.edu.iq/article_26147_391799daf84db002797205e4522f68b3.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Study the Effect of Spheroidizing Annealing on Mechanical Properties of Medium Carbon Steel
45
54
EN
10.30684/etj.29.1.18
The aim of present research is to study the effect of spheroidizing annealing<br /> for steel that contains (0.51% Ċ) on the hardness, wear rate, ultimate tensile<br /> strength, and ductility. The effect of heat treatment that prier the spheroidizing<br /> annealing treatment is studied as well , that the specimens firstly is heated to the<br /> temperature equal to ( 860 Ċ) , then cooled in furnace and in air ,and then carried<br /> out spheroidizing annealing treatment at the temperature equal to<br /> ( 860 Ċ ) for ( 6 h ) , it is show that the process of spheroidizing annealing<br /> decrease hardness, wear strength , and ultimate tensile strength , and increase<br /> ductility that improve of machining properties of steel .
https://etj.uotechnology.edu.iq/article_27101.html
https://etj.uotechnology.edu.iq/article_27101_6e573fb0356d194dedd4e4da7709d52b.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Influence of the Polymer Styrene Butadiene Rubber on Some of Clay Brick Properties
55
65
EN
10.30684/etj.29.1.19
This research studied the improvement of clay brick durability by using two<br /> methods of treatment, the first one by coating with Styrene Butadiene Rubber<br /> (Polymer) solution and the other by submerging bricks in polymer solution for<br /> various periods.<br /> The results showed that using coating method causes a slight increase in the<br /> compressive strength with a maximum percentage of 3.8% for both yellow and<br /> green brick in comparison with untreated bricks, while the compressive strength<br /> for the two types of the brick reduced when they treated using submerging<br /> method, the percentage of reduction increases by about 26% and 7% for yellow<br /> and green brick respectively at submerged period of 24 hours.<br /> The results also indicated that no efflorescence appears for all treated bricks<br /> (treated by coating and submerging methods for all periods) and a decrease in<br /> absorption with maximum percentages of 26.8% and 14.5% for yellow and green<br /> bricks respectively when the specimens submerged in polymer solution for 24<br /> hours. All the results were compared with tested samples untreated with polymer<br /> solution.
Styrene Butadiene Rubber
https://etj.uotechnology.edu.iq/article_27102.html
https://etj.uotechnology.edu.iq/article_27102_d0ab526423e04ca43d01868344ab235e.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Effect of Substrate Temperature on the Structural and Morphological Properties of Nano-structure ZnO films by Pulsed Laser Deposition
58
64
EN
Adawiya
J. Haider
Afnan
k. yousif
10.30684/etj.29.1.5
In this work, ZnO thin films were grown on sapphire (0001) substrate by<br /> Pulsed Laser Deposition using SHG with Q-switched Nd:YAG pulsed laser operation<br /> at 532nm in O2 gas ambient 5×10-2 mbar at different substrate temperatures varying<br /> from room temperature to 500°C. The influence of the substrate temperature on the<br /> structural and morphological properties of the films were investigated using XRD and<br /> SEM. As result, at substrate 400°C, a good quality and crystalline films were deposited<br /> that exhibits an average grain size (XRD) of 22.42nm with an average grain size<br /> (SEM) of 21.31nm.
PLD,ZnO films,Substrate temperature,Crystal quality,grain size,Optical properties,Nanostructures,YAG Q,Switching
https://etj.uotechnology.edu.iq/article_26148.html
https://etj.uotechnology.edu.iq/article_26148_4e28347b2bba8954c6519560a4561799.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Speed Control of Wind Turbine by Using PID Controller
65
71
EN
Fathi
R. Abusief
Mohammed
Abdulla Abdulsada
Furat
A. Abbas
10.30684/etj.29.1.6
In this paper, the output frequency of a self excited induction generator (SEIG)<br /> driven by wind turbine and supplies static load are controlled. The principle connections<br /> of wind energy conversion are presented. The dynamic modeling of the wind turbine<br /> and its linearization are derived. The PID controller which employed for turbine rotor<br /> speed control and hence the frequency regulation is proposed. The block diagram of the<br /> proposed speed control system which consists of speed controller, actuator model and<br /> the turbine linearized model is simulated by Matlab-Simulink software package
Wind turbine,speed control,PID controller,Wind Generating System
https://etj.uotechnology.edu.iq/article_26149.html
https://etj.uotechnology.edu.iq/article_26149_f8775d70a578f146fb6b3fc70ff37c96.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Increased Porosity and Their Effect on The Density and Hardness Value of (Ni—Cu) Alloy
66
74
EN
10.30684/etj.29.1.20
This research is aimed to produce Ni-Cu alloys by powder metallurgy method<br /> because its commercial and technological importance. Nickel and Copper powders<br /> were tacked then their powders mixed and blended together and classified to four<br /> parts, Sodium Chloride powder added (as a space holder) to three parts and the<br /> last remain as it is then these powders mixed and then compacted in hydrostatic<br /> pressure at 7ton, then this compact samples were sintered in furnace under argon<br /> gas at 950°C for one hour, latest these samples are grinded and polished to<br /> examine the microstructure, density, porosity, microhardness, X-ray diffraction<br /> and corrosion resistance.
Cu alloys,composite materials matrix Ni,powder metallurgy,porous materials
https://etj.uotechnology.edu.iq/article_27103.html
https://etj.uotechnology.edu.iq/article_27103_5ed9e41eacacd406cbcacc16eeef03af.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Calculations of Long Pulsed Lasers for Lithotripsy
72
81
EN
Murooj
N. Mohammad Ali
10.30684/etj.29.1.7
Urinary stone fragmentation with long pulsed Ho:YAG laser (wave length<br /> equal 2.1 μm) and Er:YAG laser (wave length equal 2.94 μm) investigated in this<br /> paper.<br /> Fragmentation efficiency of these two lasers is measured by using various energy<br /> settings. Laser induced crater depth and ablation volume for both lasers were<br /> examined and compared using mathematical model. Theoretical results were<br /> compared with experimental results obtained by Hyun Wook Kang.<br /> The study shows that the theoretical results and experimental results are<br /> comparable, and the crater depth when using Er:YAG laser was more than that on<br /> Ho:YAG laser.
Long Pulsed Lasers,YAG Laser
https://etj.uotechnology.edu.iq/article_26150.html
https://etj.uotechnology.edu.iq/article_26150_b4b6fcb1eb6839854e2bcfbd22551099.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Materials Selection in Conceptual Design using Weighting Property Method
82
95
EN
Suad
Hamzah Abdas
Mithal
A. Al-Bassam
Mohammed
Jasim Kadhim
10.30684/etj.29.1.8
The needs to combine selection of materials (SM) processes<br /> during the early stages of design have previously been realized. In this<br /> work, an attempt is made to ensure that there is no gap between function<br /> oriented design and the material. A methodology is being developed, for a<br /> concurrent qualitative selection of materials method (CQSM) that takes into<br /> consideration the importance of materials properties in the early design<br /> stages. The method is modified from quantitative method called weighting<br /> property method used for selecting materials in the detailed design stage.<br /> The method was modified to qualitative method; it means that the input data<br /> for materials property of the design must be qualitative data which<br /> consisting of groups or sub-groups of materials, range value properties and<br /> approximate values. By giving weight to the degree of importance of the<br /> properties, a developed database is search for the best group that can satisfy<br /> the CQSM. In the present investigation, a new numerical method has been<br /> build by using visual basic developed select materials for mechanical design<br /> in conceptual stage. This method, which is based on weighting property<br /> method (WPM) uses a new digital logic (DL) comparison with the<br /> traditional (DL) makes the result more accurate because it does not<br /> elimination problem of the least important criterion.
materials properties data based,physical Properties,materials selection,conceptual design,CQSM
https://etj.uotechnology.edu.iq/article_26151.html
https://etj.uotechnology.edu.iq/article_26151_c76f469e29ae0a2917f679b82adbf4c7.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Theoretical Investigation of Pneumatic Soil Vapor Extraction
96
109
EN
Inmar
N.Ghazi
Muhammad
A. Abdul-Majeed
Talib
R. Abbas
10.30684/etj.29.1.9
Pneumatic Soil Vapor Extraction (SVE) is a new remediation technique<br /> targeting to improve removal of Volatile Organic Compounds from low permeable<br /> areas in heterogeneous soil settings in unsaturated zone. In contrast to traditional SVE,<br /> in which soil vapor is extracted continuously by a vacuum pump, pneumatic SVE is<br /> based on enforcing a sequence of large pressure drops on the system to enhance the<br /> recovery from the low-permeable areas to enhance removal from areas subject to<br /> diffusion limitation. This technique has been shown to be promising at laboratory<br /> scale.<br /> A one-dimensional mathematical model was used to study governing factors<br /> and to clarify and quantify the mechanisms responsible for enhanced contaminant<br /> removal during this process. From analytical solution it is clear that the gas phase<br /> inside low permeable area moves with sinusoidal velocity whose amplitude decreases<br /> with depth. Two zones can be distinguished. First in which the gas phase can reach the<br /> high permeability area and continuously mixed with clean air, the enhanced removal<br /> mechanism is advection. The depth of this zone may range from .05m to .6m. Second<br /> is in which there is no net contaminant advection, the enhanced removal mechanism is<br /> hydrodynamic dispersion. The hydrodynamic dispersion coefficient may reach a value<br /> range from 7 to 700 times the effective molecular diffusion coefficient. In the absence<br /> of non-aqueous phase liquid in the first zone, it can be considered a clean conductive<br /> zone and impose no transport resistance on the second zone (i.e. mathematically, the<br /> upper boundary can be lowered just below the first zone).<br /> The model was tested by comparing its results with experimental results<br /> published by a previous study. Overall, comparisons appear to be reasonably good.<br /> Investigation shows that pneumatic SVE is promising at field setting. In order for this<br /> technique has significant removal enhancement the gas phase permeability in the low<br /> permeability region should be at least on order of 1*10-12 m2 (1 darcy).
Soil vapor extraction,Pneumatic,unsaturated zone,Mathematical Modeling,Volatile organic compounds
https://etj.uotechnology.edu.iq/article_26152.html
https://etj.uotechnology.edu.iq/article_26152_54d9f29c326c6ec5e672482edded62a6.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Use of Bernstein Polynomial in Numerical Solution of Nonlinear Fred Holm Integral Equation
110
115
EN
Khawla
A .AL-Zubaidy
Muna
M. Mustafa
10.30684/etj.29.1.10
In this paper, Bernstein polynomials with different degree has been used<br /> to approximate the solution of nonlinear Fredholm integral equations. A<br /> comparison between the different degree of Bernstein polynomials has been made<br /> depending on absolute error and least squares errors.<br /> keywords: Nonlinear Fredholm Integral equation, Bernstein polynomial
https://etj.uotechnology.edu.iq/article_26153.html
https://etj.uotechnology.edu.iq/article_26153_92045767c05ac4b8e023a8253a93bc02.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Theoretical and Experimental Investigation of Tool Inclination Angle in Turning Operation
116
128
EN
Ali
Abbar Khleif
Farhad
Mohammad Kushnaw
10.30684/etj.29.1.11
This paper introduces a mathematical model to calculate the amount of tool<br /> inclination angle in turning operation depending on controlling the chip flow along the<br /> cutting edge, and to simplify the setting of this angle and the direct relation with nose<br /> setting distance, a model is achieved to calculate the setting nose distance instead of<br /> changing the inclination angle. Results conducted on a series of experiments by<br /> changing tool nose setting distance where most of the cutting conditions kept constant,<br /> except tool nose setting below and above the workpiece centre, and its effect of<br /> obtained surface roughness was measured at each step.<br /> Theoretical results for finishing turning operation, for depth of cut less than 1<br /> mm, show that setting tool nose below the workpiece centre will be similar to that of<br /> setting positive angle of inclination.<br /> The main function of the derived model of the inclination angle is to make<br /> equal chip flow along the cutting edge and the chip will be cured far enough from the<br /> machined surface and therefore eliminate the chip and hence improve the workpiece<br /> surface roughness.<br /> The proposed theoretical model proved that in external turning with finishing<br /> operation the suggested inclination angle (λ) must have positive values, and the setting<br /> distance has a negative value. While in the experimental work, the workpiece surface<br /> finish has been improved when setting distance has negative value below the<br /> workpiece centre.
Turning Process,Tool Geometry,Tool Setting,Inclination angle
https://etj.uotechnology.edu.iq/article_26154.html
https://etj.uotechnology.edu.iq/article_26154_2e50cca3cb536180b51d23d31ccea929.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Tensile and Buckling Analysis of the Polymer Composite Beam Reinforced by Natural Jute Fiber
129
140
EN
Mohamad
Ali Tariq
Qahtan
Adnan Hamad
Mohamad
K. Alwan
10.30684/etj.29.1.12
This research focuses on the preparation of polymer matrix composite<br /> material by (hand lay – UP) method, where the material was prepared from<br /> unsaturated polyester resin (up) as a matrix reinforced by natural jute fiber with<br /> different volume fractions (3%, 4%, 5%, 6%).The experimental work and finite<br /> element techniques were used to analysis the tensile and the buckling analysis of<br /> the composite beam reinforced by natural jute fiber at different volume fraction.<br /> The results of experimental work of the modulus of elasticity were in the<br /> range of the theoretical results. The critical load increased with increase the fiber<br /> volume fraction that ( cr P =610N) at ( f V = 3%) and ( cr P =830N) at ( f V =6 %) for<br /> the experimental results.While ( cr P =619N) at ( f V = 3%) and ( cr P =877N) at<br /> ( f V =6 %) for the finite element results.
jute fiber,tensile,Buckling,composite,beam
https://etj.uotechnology.edu.iq/article_26155.html
https://etj.uotechnology.edu.iq/article_26155_66ec43c6c66036d7cbd61b7becf56f8d.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
Modeling, Analysis and Speed Control Design Methods of a DC Motor
141
155
EN
Jamal
A. Mohammed
10.30684/etj.29.1.13
Modern manufacturing systems are automated machines that perform the<br /> required tasks. The electric motors are perhaps the most widely used energy<br /> converters in the modern machine-tools and robots. These motors require<br /> automatic control of their main parameters (position, speed, acceleration,<br /> currents).<br /> With the help of an example, a DC motor system, the use of<br /> MATLAB/Simulink for comprehensive study of modeling, analysis and speed<br /> control design methods has been demonstrated.
DC motor,open loop,closed loop,System,speed control
https://etj.uotechnology.edu.iq/article_26156.html
https://etj.uotechnology.edu.iq/article_26156_caf969fc5d4acff18feb81e58cbf41fb.pdf
University of Technology-Iraq
Engineering and Technology Journal
1681-6900
2412-0758
29
1
2011
01
01
The Solvability, Controllability & Observability of Infinite Dimensional Nonlinear Control System Using Banach Fixed Point Theorem
156
182
EN
Manaf
Adnan Salah
Radhi
Ali Zboon
10.30684/etj.29.1.14
controllability,Observability,Fixed point theorem,Control systems and semigroup theory
https://etj.uotechnology.edu.iq/article_26157.html
https://etj.uotechnology.edu.iq/article_26157_755b924b06c3809b0faf49e8e3f41d68.pdf