bluuebunny/crossref_metadata_2025 huggingface dataset:
The effect of short range correlation on the inelastic C4 form factors of 18O nucleus
Authors: Mdekil Abdullah S.
Published: August 2020

The effect of short range correlations on the inelastic longitudinalCoulomb form factors for different states of J   4 , T  1withexcitation energies 3.553,7.114, 8.960 and 10.310 MeV in 18O isanalyzed. This effect (which depends on the correlation parameter )is inserted into the ground state charge density distribution throughthe Jastrow type correlation function. The single particle harmonicoscillator wave function is used with an oscillator size parameter b.The parameters  and b are considered as free parameters, adjustedfor each excited state separately so as to reproduce the experimentalroot mean square charge radius of 18O. The model space of 18O doesnot contribute to the transition charge density. As a result, theinelastic Coulomb form factors of 18O comes absolutely from thecore polarization transition charge density. According to thecollective modes of nuclei, the core polarization transition chargedensity is assumed to have the form of Tassie shape. It is found thatthe introduction of the effect of short range correlations is necessaryfor obtaining a remarkable modification in the calculated inelasticlongitudinal Coulomb form factors and considered as an essential forexplanation the data amazingly throughout the whole range ofconsidered momentum transfer.
The effect of annealing temperatures on the optical parameters of NiO0.99Cu0.01 thin films
Authors: Mohammed Al-Ansari Ramiz A.
Published: August 2020

NiO0.99Cu0.01 films have been deposited using thermal evaporationtechnique on glass substrates under vacuum 10-5mbar. The thicknessof the films was 220nm. The as -deposited films were annealed todifferent annealing temperatures (373, 423, and 473) K undervacuum 10-3mbar for 1 h. The structural properties of the films wereexamined using X-ray diffraction (XRD). The results show that noclear diffraction peaks in the range 2θ= (20-50)o for the as depositedfilms. On the other hand, by annealing the films to 423K in vacuumfor 1 h, a weak reflection peak attributable to cubic NiO wasdetected. On heating the films at 473K for 1 h, this peak wasobserved to be stronger. The most intense peak is at 2θ = 37.12o withthe preferential orientation of the films being (111) plane. The opticalproperties of the films have been studied. The effect of annealingtemperature on the optical parameters of NiO0.99Cu0.01 such astransmittance, reflectance, absorption coefficient, refractive index,extinction coefficient, and real and imaginary parts of dielectricconstant has been reported.
Compressive strength measurement for cement replacement with recycled glass in concrete
Authors: Khalil Asmaa S.
Published: August 2020

The most important environmental constraints at the present timeis the accumulation of glass waste (transparent glass bottles). A lot ofexperiments and research have been made on waste and recyclingglass to get use it as much as possible. This research using recyclingof locally waste colorless glass to turn them into raw materials asalternative of certain percentages of cement to save the environmentfrom glass waste and reduce some of the disadvantages of cementwith conserving the mechanical and physical properties of concretemade. A set of required samples were prepared for mechanical testwith different weight percentage of waste glass (2%, 4%, 5%, 6%,8%, 10%, 15%, 20% and 25%). American standard for calibration(ASTM C109 / C109M-02) to measure the compressive strengthwhere the results showed that the Maximum compressive strengthwas obtained at the low weight percentage replacement 2%, 4% and5% 6% which is 67.12, 69.24, 62.56 and 59.96 Mpa respectively. fororiginally mix recorded bending resistance (54.16) Mpa.
Preparation and studying of some properties of polymer composites reinforced with natural and artificial fibers
Authors: Hameed Awham M.
Published: August 2020

This work concerns the thermal and sound insulation as well as the mechanical properties of polymer matrix composite reinforced with glass fibers. These fibers may have dangerous effect during handling, for example the glass fibers might cause some damage to the eyes, lungs and even skin. For this reason the present work, investigates the behavior of polymer composite reinforced with natural fibers (Plant fibers) as replacement to glass fibers. Unsaturated Polyester resin was used as matrix material reinforced with two types of fibers, one of them is artificial (Glass fibers) and the other type is natural (Jute, Fronds Palm and Reed Fibers) by hand lay-up technique. All fibers are untreated with any chemical solvent. The Percentage of mixing was (90 wt. %) of the matrix while the weight fraction of each type of fibers was fixed (10 wt. %). The mechanical tests included impact and flexural strength tests. The results showed that the impact strength and flexural strength of the composites reinforced with Jute fibers is higher than that of Glass fibers and other natural fibers. The coefficients of thermal conductivity of the composites were measured by Lee's disc apparatus, the results show that the thermal insulation of the composite reinforced with jute fibers is higher than that of glass fibers and other natural fibers. The acoustic insulation of the composites reinforced with Jute fibers showed excellent result in insulation compared with glass fibers and other natural fibers.
Effect of low level nozzle height on properties of copper oxide absorption layer prepared by fully computerized spray pyrolysis depositions
Authors: Essa Mohammed S.
Published: August 2020

The effect of approaching nozzle jet from the deposition surfaceon structural, optical and morphology properties of copper oxide thinfilms was studied. The film was prepared by homemade fullycomputerized CNC spray pyrolysis deposition technique atpreparations speed (3, 4, 5, and 6 mm/sec). The repeated line modewas used at deposition temperature equal 450 °C whereas thespraying time was in the range of (15-30 min) according to thedeposition speed. The film exhibit polycrystalline structure withpreferred orientation along (-111), (022) and (011), (002) at a 2θvalue of (35.63o) and (38.8o) respectively. Optical band gaps wererecorded at these speed shows variance in value from (1.53-2.08 eV).Films thickness were found to be in the range (128-412 nm) whichdepends on preparation speed.
Effect of water absorption on some mechanical and physical properties of epoxy/polyurethane blend reinforced with nano silica powder
Authors: Salih Rana M.
Published: August 2020

The aim of this work is to evaluate some mechanical and physicalproperties (i.e. the impact strength, hardness, flexural strength,thermal conductivity and diffusion coefficient) of(epoxy/polyurethane) blend reinforced with nano silica powder (2%wt.). Hand lay-up technique was used to manufacture the compositeand a magnetic stirrer for blending the components. Results showedthat water had affected the bending flexural strength and hardness,while impact strength increased and thermal conductivity decreased.In addition to the above mentioned tests, the diffusion coefficientwas calculated using Fick’s 2nd law.
Effect of UV radiation on dielectric properties of PU/nano-TiO2 composites
Authors: Abdullah Ahmed Q.
Published: August 2020

The dielectric constant of most polymers is very low; the addition of TiO2 particles into the polymers provides an attractive and promising way to reach a high dielectric constant. Polymer-based materials with a high dielectric constant show great potential for energy storage applications. Four samples were prepared, one of them was polyurethane (PU) and the other were PU with different weight percent (wt %) of TiO2 (0.1, 0.2, 0.3) powder AFM test was used to distinguish the nanoparticles. The result shows that the most shape of these nanoparticles are spherical and the roughness average is 0.798 nm. The dielectric properties were measured for all samples before and after the exposure to the UV radiation. The result illustrates that the dielectric constant decreased and the dielectric loss increased, the amount of decrease in the dielectric constant decreases with the increasing of the TiO2 concentration that added to the PU and decreasing in the amount of dielectric loss.
The study of nonlinear optical properties of rhodamine B dye and TiO2 nanoparticles doped in PMMA polymer
Authors: Khlaif Lamyaa Gand
Published: August 2020

In this research, A thin film of Rhodamine B dye and TiO2 Nanoparticles doped in PMMA Polymer has been prepared by a casting method. The sample was spectrum absorption by UV-Vis. The nonlinear optical properties were measured by Z- scan technique using Nd:YAG laser with (1064 nm) wavelength. The nonlinear refractive index (n2) and nonlinear absorption coefficient (β) were estimated for the thin film for different energies of the laser, n2 and β were decreased with increasing intensity of incident laser beam. Also, the type of β was two-photon absorption and n2 negative nonlinear reflective.
Effect of annealing and chemical treatment on structural and optical properties of CuPcTs/PEDOT:PSS (BHJ Blend) thin films
Authors: Ramadhan Amer A.
Published: August 2020

In this work, The effect of annealing treatment at different temperatures (373, 423 and 473) K and chemical treatment with talwen at different immersion time (40, 60 and 80) min on structural and optical properties of the bulk heterojunction (BHJ) blend copper phthalocyanine tetrasulfonic acid tetrasodium salt/poly dioxyethylenethienylene doped with polystyrenesulphonic acid (CuPcTs/PEDOT:PSS) thin films were investigated. The films were fabricated using spin coating technique. X-ray diffraction (XRD) measurements displayed only one peak at 2θ =4.5o corresponding to (001) direction which has dhkl larger than for standard CuPcTs. The dhkl increase then decrease with increasing annealing temperature andthe time of chemical treatment with talwen. FTIR measurements show that, the peaks for O-H, in general, decrease with increasing annealing temperature, while the peaks corresponding to C=C aromatic bond and C-N bond decrease at 373 K then increase at 423 and 473 K. The peaks for O-H, in general, decrease with increasing immersing time, while the peaks corresponding to C=C aromatic bond and C-N bond decrease at 40 min then increase at more immersing time. From UV-visible measurements, the absorption spectra peaks for B and Q-bands increase at 373K and at 40 min immersing time with talwen and decrease at more annealing or chemical treated time.
Calculation of the total mass stopping power for electrons in some human body tissues in the energy range 0.01-1000 MeV
Authors: Mahdi Jinan F.
Published: August 2020

The mass collision energy loss (dE/dX), the mass radiative energy loss (Srad/) and the total mass stopping power of electrons in the energy range of 0.01 MeV up to 1000 MeV has been calculated for Lung, Urea and Skin. The results of the present work for the mass collision stopping power of electrons in Lung, Urea and Skin are in excellent agreement with the standard results given by ESTAR program, where the maximum percentage error between the present calculated values and that of ESTAR program in Lung tissue, Urea and Skin tissue is 0.27%, 0.3% and 0.8% respectively. The mass radiative energy loss of electrons in the same energy range is also calculated using a modified equation, and the results are found to be in very good agreement with the standard published values. The employed modified equation used to calculate the mass radiative energy loss of electrons is valid in the energy range of electrons from 0.01 MeV up to 1000 MeV and gives accurate results. As the results of total stopping power calculation are concerned, they are found in excellent agreement with the published results, where the error is less than 1%.
Simulation and experimental study of Pin-Plate DC discharge plasma technique
Authors: Aadim Kadhim A.
Published: August 2020

The present work intends to study of dc glow discharge were generated between pin (cathode) and a plate (anode) in Ar gas is performed using COMSOL were used to study electric field distribution along the axis of the discharge and also the distribution of electron density and electron temperature at constant pressure (P=.0.0mbar) and inter electrode distance (d=4 cm) at different applied voltage for both pin cathode system and plate anode and comparison with experimental results.
Preparation of Ag nanoparticles via pulsed laser ablation in liquid for biological applications
Authors: Noori Ammar M.
Published: August 2020

Ag nanoparticles were prepared using Nd:YAG laser from Ag matel in distilled water using different energies laser (100 and 600) mJ using 200 pulses, and study the effect of the preparation conditions on the structural characteristics of and then study the effect of nanoparticles on the rate of killing the two types of bacteria particles (Staph and E.coli). The goal is to prepare the nanoparticle effectively used to kill bacteria.
Study of in vitro and in vivo free radical scavenging activity for radioprotection of cerium oxide nanoparticles
Authors: Al-Mashhadani Asia H.
Published: August 2020

Nanoceria have shown numerous unique characteristics, such as biocompatibility and are excellent agents for biological applications. The aim of this study is to investigate cerium oxide nanoparticles for 2, 2- diphenyl-1-picryl-hydrazyl-hydrate (DPPH) free radical scavenging activity and their ability to offer protection against ionizing radiation. In vitro antioxidant activity study of nanoceria particles has shown good free radical scavenging activity for DPPH radical assayed within a concentration range of 0.01 to 0.05 g/l, at higher concentrations of nanoparticles showed reverse trend in absorbance and inhibition indicating this finite rang of concentration is suitable for scavenging free radicals, also nanoparticles were found to have significant antioxidant capacity and thus can be used as potential radical scavenger against deleterious damages caused by the free radicals. The results of histopathological examination showed effectiveness of CeO2 nanoparticles in radioprotection of skin cells in animal models during radiation exposure.
The effect of gold nanoparticles on WO3 thin film
Authors: Ibrahim Isam M.
Published: August 2020

Chemical spray pyrolysis technique was used at substrate temperature 250 ˚C with annealing temperature at 400 ˚C (for 1hour) to deposition tungsten oxide thin film with different doping concentration of Au nanoparticle (0, 10, 20, 30 and 40)% wt. on glass substrate with thickness about 100 nm. The structural, optical properties were investigated. The X-ray diffraction shows that the films at substrate temperature (250 ˚C) was amorphous while at annealing temperature have a polycrystalline structure with the preferred orientation of (200), all the samples have a hexagonal structure for WO3 and Au gold nanoparticles have a cubic structure. Atomic force microscopy (AFM) was used to characterize the morphology of the films. The optical properties of the films were studied using UV-Vis spectrophotometer within the wavelength in the range (300-1100) nm. The optical energy gap of the films was (2.80) eV for WO3 and it decreased at annealing temperature (400 ˚C) equal to (2.65) eV. And finally the optical constants such as refractive index, real and imaginary dielectrics, absorption coefficient, absorption, transmission, and extinction coefficient were investigated.
Preparation single layer of (MgO) as antireflection coating using PLD technique
Authors: Aadim Kadhim A.
Published: August 2020

In this work preparation of antireflection coating with single layer of MgO using pulsed laser deposition (PLD) method which deposit on glass substrate with different thicknesses (90 and 100) nm annealed at temperature 500 K was done.The optical and structural properties (X-ray diffraction) have been determined. The optical reflectance was computed with the aid of MATLAB over the visible and near infrared region. Results shows that the best result obtained for optical performance of AR'Cs at 700 shots with thickness 90 nm nanostructure single layer AR'Cs and low reflection at wavelength 550 nm.
Analysis of the absorption spectra in the visible and ultraviolet regions of some medical ointments available in Iraqi markets
Authors: J A. Kadhim
Published: August 2020

Three types of medical commercial creams Silvazine, Cinolon Tar and Hydroquinon Domina were incorporated in this study. The medical creams were taken directly and placed uniformly on the glass slide. Each type of pharmaceutical was weighed at 1 mg and dispersed on an area of 1x1 cm. This process ensures same thickness for all samples. The creams were analyzed by using double-beam UV/visible spectrophotometer Metertech SP8001. The absorption spectrum for each of samples was measured against wavelength range of 300–700 nm.
The study of nuclear structure for some nuclei
Authors: Abdul Muhsin Zahraa A.
Published: August 2020

An analytical form of the ground state charge density distributionsfor the low mass fp shell nuclei ( 40  A  56 ) is derived from asimple method based on the use of the single particle wave functionsof the harmonic oscillator potential and the occupation numbers ofthe states, which are determined from the comparison between theoryand experiment.For investigating the inelastic longitudinal electron scattering formfactors, an expression for the transition charge density is studiedwhere the deformation in nuclear collective modes is taken intoconsideration besides the shell model space transition density. Thecore polarization transition density is evaluated by adopting theshape of Tassie model together with the derived form of the groundstate charge density distribution. In this work, we devote ourinvestigation on 0 3 2 3 1 1   transition of Ti 50 , 0 1 2 1 1 1   transitionof Cr 50 and 0 2 2 2 1 1   of Cr 52 nuclei. It is found that the corepolarization effects, which represent the collective modes, areessential for reproducing a remarkable agreement between thecalculated inelastic longitudinal C2 form factors and those ofexperimental data.
Effect of Sb2O3 and/or CdO nanoparticle substitution on the properties of high-TC superconducting Bi1.6-x SbxPb0.4Sr2Ca2-yCdyCu3OZ material
Authors: Salih Sihama I.
Published: August 2020

High temperature superconductors materials with composition Bi1.6-xSbxPb0.4Sr2Ca2-yCdyCu3OZ (x = 0, 0.1, 0.2 and 0.3) and (y = 0.01 and 0.02), were prepared by using the chemical reaction in solid-state ways, and test influence of partial replacement of Bi and Ca with Sb and Cd respectively on the superconducting properties, all samples were sintered at the same temperature (850 oC) and for the same time (195 h). The structural analysis of the prepared samples was carried out using X-ray diffraction (XRD) measurements performed at room temperature, scanning electron microscope (SEM) and dc electrical resistivity was measured as a function of temperature. It was found that the sample prepared by partial substitution of Sb at ratio (x= 0.2) and Cd with ratio (y=0.01), has the maximum value of zero resistance temperature, where was the TC(onset) and TC(0) values for this sample are (140 K) and (123 K) respectively, and XRD results reveal that this sample has the highest percentage of Bi- 2223 phase, as well as the analysis of XRD patterns of the prepared materials showed polycrystalline structure and signalize that all samples had an orthorhombic crystalline structure. It was concluded that Sb2O3 nanoparticles it may be acts as a flux agent in the matrix to lower the partial melting temperature of the samples and that leads to the promotion of the high-TC phase.
Nano MgO catalyst for chemical depolymerization of polyethylene terephthalate (PET)
Authors: Alhussain Alzuhairi Mohammed A.
Published: August 2020

This paper focuses firstly on the production of monomers bis (2-hydroxyethyl) terephthalate (BHET) and oligomers by using two different form of MgO light active and Nano Magnesium oxide with different weight ratio (0.15, 0.25 and 0.5) by using chemical recycling glass condenser at 190 ˚C. The second purpose is to study the effect of catalyst ratio, time of reaction and yield of products of the product. Elemental analysis for Carbon –Hydrogen and Nitrogen (CHN), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) have been investigated. Results indicated the catalytic activity was found to correlate with surface area; however, LA MgO has shown an exceptional activity, still it is higher than Nano MgO in order to reduce the reaction time till 30 minutes instead of 7 hours without catalyst. The analysis of the thermograms has indicated the presence of various kinds of monomer, dimer and oligomers that are formed during the recycling; this is particularly evident due to new peaks indicating the formation of BHET monomer and oligomer of lower molecular masses.
Dielectric properties of Li doped Ni-Zn ferrite
Authors: Jaber Nasma A.
Published: August 2020

Lithium doped Nickel-Zinc ferrite material with chemical formula Ni0.9−2x Zn0.1LixFe2+xO4, where x is the ratio of lithium ions Li+ (x = 0, 0.01, 0.02, 0.03 and 0.04) prepared by using sol-gel auto combustion technique. X-ray diffraction results showed that the material have pure cubic spinal structure with space group Fd-3m. The experimental values of the lattice constant (aexp) were decreased from 8.39 to 8.35 nm with doped Li ions. It was found that the decreasing of the crystallite size with addition of lithium ions concentration. The radius of tetrahedral (rtet) and octahedral (roct) site were computed from cation distribution. SEM images have been taken to show the morphology of compound. The dielectric parameters [dissipation factor (Df), the dielectric constant (Ԑ') and a.c. conductivity (ζac)] of spinal ferrite nano-powder have been measured. The dielectric parameters as a function of concentration have been studied for ferrite synthesis. The saturation of magnetization (Ms), remiensis (Mr) and coersivity (Hc) were found from hysteresis loop. The Ms and Hc varied from 36.47 to 66.15 emu/gm and 103 to 133 Oe for ferrite synthesis, respectively.
Optical properties for prepared polyvinyl alcohol/ polyaniline/ ZnO nanocomposites
Authors: H. Salma Mohamed
Published: August 2020

The optical energy gap and optical constants such as the reflective index, dielectric constant have been evaluated due to The optical transmission and UV-VIS absorption spectra have been recorded in the wavelength (200 - 1100 nm) for PVA/PANI polymer blends and PVA/PANI/ZnO nanocomposites with different concentrations of ZnO (0.02, 0.05, 0.07, 0.1and 0.2) wt %. The results indicate that the materials have allowed direct transition. The reflection index and dielectric constant are increase with wavelength
Estimation of kidney tumor volume in CT images using medical image segmentation techniques
Authors: Mahmood Faleh H.
Published: August 2020

Kidney tumors are of different types having different characteristics and also remain challenging in the field of biomedicine. It becomes very important to detect the tumor and classify it at the early stage so that appropriate treatment can be planned. Accurate estimation of kidney tumor volume is essential for clinical diagnoses and therapeutic decisions related to renal diseases. The main objective of this research is to use the Computer-Aided Diagnosis (CAD) algorithms to help the early detection of kidney tumors that addresses the challenges of accurate kidney tumor volume estimation caused by extensive variations in kidney shape, size and orientation across subjects.In this paper, have tried to implement an automated segmentation method of gray level CT images. The segmentation process is performed by using the Fuzzy C-Means (FCM) clustering method to detect and segment kidney CT images for the kidney region. The propose method is started with pre-processing of the kidney CT image to separate the kidney from the abdomen CT and to enhance its contrast and removing the undesired noise in order to make the image suitable for further processing. The resulted segmented CT images, then used to extract the tumor region from kidney image defining the tumor volume (size) is not an easy task, because the 2D tumor shape in the CT slices are not regular. To overcome the problem of calculating the area of the convex shape of the hull of the tumor in each slice, we have used the Frustum model for the fragmented data.
Characterization of (SnO2)1-x(TiO2:CuO)x films as NH3 gas sensor
Authors: Mahmood Sara S.
Published: August 2020

Tin dioxide (SnO2) were mixed with (TiO2 and CuO) with concentration ratio (50, 60, 70, 80 and 90) wt% films deposited on single crystal Si and glass substrates at (523 K) by spray pyrolysis technique from aqueous solutions containing tin (II) dichloride Dihydrate (SnCl2, 2H2O), dehydrate copper chloride (CuCl2.2H2O) and Titanium(III) chloride (TiCl3) with molarities (0.2 M). The results of electrical properties and analysis of gas sensing properties of films are presented in this report. Hall measurement showed that films were n-type converted to p- type as titanium and copper oxide added at (50) % ratio. The D.C conductivity measurements referred that there are two mechanisms responsible about the conductivity, hence it possess two activation energies. Maximum sensitivity 16 % obtained for sample (SnO2)40(TiO2: CuO) 60 toward (NH3) gas at the operating temperature (473 K), whereas faster response time and recovery time were 20 (s) for (SnO2) and (SnO2)20(TiO2:CuO)80 respectively.
Wear rate of epoxy resin reinforced with multi walls carbon nanotubes
Authors: Hameed Ayad Qabash
Published: August 2020

In this study, nanocomposites have been prepared by addingmultiwall carbon nanotubes (MWCNTs) with weight ratios (0, 2, 3,4, 5) wt% to epoxy resin. The samples were prepared by hand lay-upmethod. Influence of an applied load before and after immersion insodium hydroxide (NaOH) of normality (0.3N) for (15 days) atlaboratory temperature on wear rate of Ep/MWCNTsnanocomposites was studied. The results showed that wear rateincreases with increasing the applied load for the as prepared andimmersed samples and after immersion. It was also found that epoxyresin reinforced with MWCNTs has wear rate less than neat epoxy.The sample (Ep + 5wt% of MWCNTs) has lower wear rate. Theimmersion effect in base solution led to increase in wear rate valuesfor all samples compared to natural condition.
The effect of the cold atmospheric plasma on the number of platelets
Authors: Gadhban Ansam Q.
Published: August 2020

This study includes the direct influence of (single & multi) dose of Cold Atmospheric Plasma (CAP) on the no. of platelets for mice for different exposure time (15, 30, 60, and 120) sec. the influence of CAP on mice was measured after 1, 2, 3, 7, and 14 day from exposure.The results obtained in this study indicate that the effect of low doses of CAP on platelets was stimulatory effect in the first few hours from exposure (1day) but the high dose was inhibitory, It was found that after two weeks of exposure that the number of platelets became normal comparable to the control one, and this indicates that plasma effect was removed after this period.
Electromagnetic multipole of positive and negative parity states in 24Mg by elastic and inelastic electron scattering
Authors: Manie NOORI S. , Alzubadi Ali A.
Published: August 2020

In the present work, the nuclear shell model with Hartree–Fock (HF) calculations have been used to investigate the nuclear structure of 24Mg nucleus. Particularly, elastic and inelastic electron scattering form factors and transition probabilities have been calculated for low-lying positive and negative states. The sd and sdpf shell model spaces have been used to calculate the one-body density matrix elements (OBDM) for positive and negative parity states respectively. Skyrme-Hartree-Fock (SHF) with different parameterizations has been tested with shell model calculation as a single particle potential for reproducing the experimental data along with a harmonic oscillator (HO) and Woods-Saxon (WS) single-particle potentials. The effect of the nuclear effective charge has been implemented via using different folding models; valance, Tassie and Bohr-Mottelson. The evaluated results have been discussed and compared with available experimental data.
A Study of the Spectroscopic Performance of Laser Produced CdTe(x):S(1-x) Plasma
Authors: Aadim Kadhim Abdulwahid
Published: August 2020

Abstract

In this work, the plasma parameters (electron temperature (Te), electron density( ne), plasma frequency (fp) and Debye length (λD)) have been studied by using the spectrometer that collect the spectrum of Laser produce CdTe(X):S(1-X) plasma at X=0.5 with different energies. The results of electron temperature for CdTe range 0.758-0.768 eV also the electron density 3.648 1018 – 4.560 1018 cm-3  have been measured under vacuum reaching 2.5 10-2 mbar .Optical properties of CdTe:S were determined through the optical transmission method using ultraviolet visible spectrophotometer within the range 190 – 1100 nm.
Characterization of Zinc oxide Nanostructures prepared by hydrothermal method with Antibacterial property
Authors: Ali Ibrahim abdulkareem
Published: August 2020

In this study, Zinc oxide nanostructures were synthesized via a hydrothermal method by using zinc nitrate hexahydrate and sodium hydroxide as a precursor. Three different annealing temperatures were used to study their effect on ZnO NSs properties. The synthesized nanostructure was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Atomic force microscope (AFM), and Fourier Transform Infrared Spectroscopy (FTIR). Their optical properties were studied by using UV -visible spectroscopy. The XRD analysis confirms that all ZnO nanostructures have the hexagonal wurtzite structure with average crystallite size within the range of (30.59 - 34.52) nm. The crystallite size increased due to the incensement of annealing temperature. FESEM analysis indicates that ZnO has hexagonal shape of cylindrical pores, plate-like nanocrystals and Nanorods. AFM analysis shows that the average surface roughness of ZnO Nanostructures increases from 3.96 to 19.1 nm with the increase of annealing temperature. The FTIR peaks indicate successful preparation of ZnO Nanostructures. The FTIR method was used to analyses the chemical bonds which conformed the present of the Zn-O group in the region between (400-500) cm-1. The UV-visible showed a red shift in the absorption spectra related to the shift in the energy gap related to increase in the particle size.  the band gap energy has been calculated from the optical absorption spectra. The annealing process has been fond more effective on the value of energy gap. As the annealing temperature increases, the value of energy gap, increases as well; from (3.12to 3.22) eV. The prepared Nanostructure is used for antibacterial property. It shows strong antibacterial activity against S. aureus and P.aeuruginosa bacteria by the agar disc diffusion method. The white precipitate of ZnO NSs has superior antibacterial activity on gram-positive (S. aureus) than the gram-negative (P.aeuruginosa) bacteria.
Manufacturing Zener diode using ZnO-CuO-ZnO/Si structures deposited laser induced plasma technique
Authors: Mustafa Safa kamal
Published: August 2020

In this paper Zener diode was manufactured using ZnO-CuO-ZnO/Si heterojunction structure that used laser induced plasma technique to prepare the nanofilms. Six samples were prepared with a different number of laser pulses, started with 200 to 600 pulses on ZnO tablet with fixed the number of laser pulses on CuO tablet at 300 pulses. The pulse energy of laser deposited was 900mJ using ZnO tablet and 600mJ using CuO tablet. All prepared films shown good behavior as Zener diode when using porous silicon as substrate.
Gas Sensing of (SnO2)1-x(ZnO)x Composite Associating with Electrical Properties
Authors: Yas Dunia
Published: August 2020

Abstract

Semiconductor-based gas sensors were prepared, that use n-type tin oxide (SnO2) and  tin oxide: zinc oxide composite (SnO2)1-x(ZnO)x at different x ratios using pulse laser deposition at room temperature. The prepared thin films were examined to reach the optimum conditions for gas sensing applications, namely X-ray diffraction, Hall effect measurements, and direct current conductivity. It was found that the optimum crystallinity and maximum electron density, corresponding to the minimum charge carrier mobility, appeared at 10% ZnO ratio. This ratio appeared has the optimum NO2 gas sensitivity for 5% gas concentration at 300 °C working temperature.
Acetic acid concentration estimation using plastic optical fiber sensor based surface Plasmon resonance
Authors: Jassam Ghufran Mohammed
Published: August 2020

Optical fiber chemical sensor based surface Plasmon resonance for sensing and measuring the refractive index and concentration for Acetic acid is designed and implemented during this work. Optical grade plastic optical fibers with a diameter of 1000μm were used with a diameter core of 980μm and a cladding of 20μm, where the sensor is fabricated by a small part (10mm) of optical fiber in the middle is embedded in a resin block and then the polishing process is done, after that it is deposited with about (40nm) thickness of gold metal and the Acetic acid is placed on the sensing probe.
Band Gap Characterization of Thermally Treated Hybrid Blend ZnPc/CdS Thin Films
Authors: Alobaidy Holya a.
Published: August 2020

Spin coating technique used to prepare ZnPc, CdS and ZnPc/CdS blend thin films, these films annealed at 423K for 1h, 2h and 3h. Optical behavior of these films were examined using UV-Vis. and PL. The absorption spectrum of ZnPc shows a decreasing in absorption with the increase of annealing time while CdS spectrum give a clearly absorption peak at~510 nm. Energy gap of ZnPc increases from 1.41 to 1.52 eV by increasing the annealing time. Eg of CdS decrease by increasing annealing time, from 2.3 eV to 2.2 eV. The intensities of the peaks obtained from PL spectra were strongly dependent on annealing time and confirmed the results obtained from UV-Vis. D.C. conductivity measurement showed that all the thin films have two different activation energies in the temperature range 303–473K.
Synthesis and Characterization of P3HT Metal Nanoparticles Hybrid Junction
Authors: Mustafa Mustafa A. , Abdullah Estabraq T.
Published: August 2020

In this work the fabrication and characterization of poly(3-hexylthiophene) P3HT-metallic nanoparticles (Ag, Al). Pulsed Laser Ablation (PLA) technique was used to synthesis the nanoparticles in liquid. The Fourier Transformer Infrared (FTIR) for all samples indicate the chemical interaction between the polymer and the nanoparticles. Scanning Electron Microscopic (SEM) analysis showed the particle size for P3HT-AgNps samples between 44.50 nanometers as well the spherical structure. While for P3HT-AlNps samples was flakes shape. Energy Dispersive X-ray (EDX) spectra show the existing of amount of metallic nanoparticles.
Elastic Electron-Palladium Scattering
Authors: Kadem Sinaa fahad
Published: August 2020

توزيعات كثافة البروتون (PDD)، خلافاتهم وتناثر الإلكترون مرنة عوامل الشكل، F (ف) من ارض الدولة لبعض نوى قذيفة، مثل ( 104 المشتريات، 106 المشتريات، 108 المشتريات، 110 المشتريات) النظائر كانت محسوبة على أساس استخدام الاحتلال على المدارات السطحية للأغلفة المتآكلة من المستوى 2 p ، والأغلفة المتآكلة لمدة 2 ثانية ، والأغلفة المكتسبة لمدة ساعة ، ووظائف الموجة لمذبذب التوافق المحتمل مع معلمات الحجم المختارة لإعادة إنتاج نصف قطر شحنة التربيع المربع المتوسط ​​الملاحظ لكل النوى التي يتم اعتبارها . لقد وجد أن إدخال معلمات إضافية ، وهما d 1 و d 2 والتي تعكس اختلاف أرقام احتلال الولايات عن التنبؤ بنموذج القشرة البسيطة SSM تؤدي إلى اتفاق ملحوظ بين النتائج المحسوبة والتجريبية لتوزيعات كثافة البروتون (PDD) في كامل نطاق (r).
Digitale Planung hybrider Arbeitssysteme – Planungsprozess am Beispiel einer Leichtbauroboter-Zelle
Authors:   Institut für Produktionssysteme, Technische Universität Dortmund, Deuse Jochen ,   Advanced Manufacturing/ Industry 4.0 School of Mechanical and Mechatronic Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Barthelmey André ,   Institut für Produktionssysteme, Technische Universität Dortmund, Weßkamp Vanessa ,   Institut für Produktionssysteme, Technische Universität Dortmund
Published: August 2020

Die Entwicklung hin zu individualisierten Produkten stellt insbesondere den Hochlohnstandort Deutschland in Bezug auf die Variabilität in den Produktionsprozessen vor neue Herausforderungen (Delang et al. 2017). Diese können durch konventionelle Automatisierungslösungen aufgrund hoher Flexibilitätsanforderungen nicht bewältigt werden (Berg/Reinhart 2017). Ein großes Potenzial hingegen verspricht eine engere Zusammenarbeit zwischen Mensch und Roboter, die bis zur Interaktionsform Mensch-Roboter-Kollaboration (MRK) ausgeprägt werden kann (Müller et al. 2019). Die zu diesem Zweck entwickelten Leichtbauroboter (LBR) rücken daher im Zuge der Digitalisierung und Industrie 4.0 verstärkt in den Fokus. Die Anwendungen solcher Systeme in der Industrie nehmen stetig zu, sind jedoch in den Unternehmen noch nicht flächendeckend verbreitet (Oubari et al. 2018; Selevsek/Köhler 2018). Als Gründe sind insbesondere aufwändige Planungsprozesse, die für einen wirtschaftlichen Einsatz von Arbeitsplätzen mit MRK heute noch zwingend erforderlich sind, zu nennen (Ranz et al. 2017). Eine im Rahmen des Forschungsvorhabens „KoMPI“ entwickelte digitale Planungsunterstützung für hybride Arbeitssysteme verkürzt diesen Planungsprozess (BMBF 2017). Die Basis der Planungsunterstützung bildet die Software „ema Work Designer“, welche ein realitätsgetreues Abbild von MRK-Systemen ermöglicht. Ziel der Nutzung einer digitalen Simulation ist die zielgerichtete Konzeption der Schnittstellen zwischen Mensch, Technik und Organisation. Auf diese Weise sollen die Stärken des Menschen wie Flexibilität, Kreativität und Sensitivität mit den Vorteilen des Roboters wie Kraft, Ausdauer und Präzision kombiniert werden, sodass ein sicheres und wirtschaftliches System entsteht. Die Planungsunterstützung ist in ein ganzheitliches Planungskonzept eingebunden, das alle Interaktionslevel von der Koexistenz bis hin zur Kollaboration berücksichtigt (vgl. Bauer et al. 2016). Zur Sicherung der Anwendungsfreundlichkeit und Eignung für KMU fand während der Entwicklung der einzelnen Schritte ein intensiver Austausch mit Anwenderunternehmen statt.
Rancang Bangun Penampung Sampah Laut Portable (PSP) dan Uji Solar Panel untuk Mengurangi Sampah Laut
Authors: Siboro Amanda T , Siahaan Feby Angelin Garizi , Simanjuntak Sarnaen , Lubis Muhammad Zainuddin Zainuddin
Published: August 2020

Sampah laut adalah sampah hasil pembuangan yang dihasilkan oleh manusia yang terbuang ke lingkungan pesisir dan laut. Keberagaman aktivitas manusia yang tersebar dimana saja dapat menjadi sumber sampah. Sumber ini dapat berlokasi di laut, sepanjang pesisir, maupun daerah pedalaman. Sampah - sampah ini berpindah dari satu tempat ke tempat lain dalam jarak yang jauh dan dapat memasuki habitat laut. Akumulasi dari sampah laut, tentunya dapat mempengaruhi habitat makhluk hidup, fungsi ekologikal organisme, dan juga dapat menimbulkan masalah kesehatan. Tujuan dari penelitian ini adalah untuk menguji kinerja prototipe penampung sampah laut portable (PSP) dalam mengurangi jumlah sampah laut. Metode pengujian yang digunakan yaitu mengukur dan membandingkan volume sampah laut yang diperoleh dalam beberapa waktu pengujian dengan jumlah keseluruhan rerata harian sampah laut pada daerah uji coba yaitu Perairan Punggur, mengidentifikasi ukuran dan jenis bahan sampah yang tertampung, menguji ketahanan prototipe dengan berat sampah berbeda, mengukur luas cakupan area yang dapat dijangkau oleh prototipe, sekaligus dilakukan juga identifikasi parameter oseanografi yang ada pada daerah uji untuk melihat pengaruh parameter oseanografi terhadap kinerja prototipe. Dimana dari hasil pengujian, diketahui bahwa lamanya prototipe dapat bekerja dalam kondisi baterai optimal adalah 1 - 3 jam, dengan kecepatan motor 2800 rpm, berat maksimum yang dapat ditampung oleh prototipe adalah 1 – 4 kg. Parameter oseanografi yang teridentifikasi yaitu kecepatan arus 0.7 m/s. Hasil uji lapangan juga menunjukkan parameter oseanografi juga berpengaruh dalam keefektifan kinerja prototipe.

 

Kata kunci: Rancang bangun, sampah laut, penampung sampah laut portable, oseanografi
Alat Pengendali Arus pada Mesin DC-400 Berbasis Mikrokontroler dan Android
Authors: Istardi Didi , Ghafur Muhammad Abdul , Ariyanto Nugroho Pratomo
Published: August 2020

Power source adalah alat yang berfungsi untuk menyuplai arus listrik pada tipe pengelasan SMAW (Shield Metal Arc Welding), contohnya adalah mesin DC-400. Keluaran arus mesin tersebut diatur dengan menggunakan sebuah knob pada panel output control agar dapat menghasilkan panas yang sesuai kebutuhan pengelasan. Seiring perkembangan, pengelas (welder) menyadari bahwa adanya keterbatasan dari cara pengontrolan arus pada mesin tersebut. Jarak pengontrolan yang mengharuskan penggunanya menuju langsung ke mesin menyebabkan ketidakefisienan dalam pekerjaan. Oleh karena itu, diperlukannya sebuah alat pengendali yang dapat mengatur keluaran arus dari jarak jauh. Sehingga perlunya untuk menciptakan “Alat Pengendali Arus Pada Mesin DC-400 Berbasis Mikrokontroler dan Android”. Alat ini dapat mengatur nilai keluaran arus jarak jauh dan tanpa kabel yang mana mikrokontroler sebagai pusat kontroler dan android sebagai sumber masukannya. Dari hasil penelitian, semakin besar nilai R1 potensiometer yang diatur, maka semakin besar arus pengelasan yang dihasilkan. Error rata-rata antara arus las menggunakan knob dan remote yaitu sebesar 4.65%.
RANCANG BANGUN OWNCLOUD DAN MELINDUNGINYA TERHADAP SERANGAN DDOS
Authors: Arman Molavi , Inayatullah Inayatullah
Published: August 2020

Layanan penyimpanan menggunakan Google Drive ataupun DropBox merupakan layanan yang  digunakan secara cuma-cuma di internet, sebagai besar menggunakan teknologi Cloud Computing. Hal ini berarti layanan pada Cloud Computing dapat disediakan dengan cepat dan meminimalisir interaksi dengan penyedia layanan vendor/provider Cloud Computing. Tempat penyimpanan data yang sering menjadi kendala yang bersifat pribadi ataupun pekerjaan, seringkali menyulitkan dalam mengakses. Gangguan keamanan dari aktifitas  jaringan seperti Denial of Service dan infeksi virus yang cukup beragam. Kesulitan berbagi data dengan inipun menjadi kendala terutama menyeting batas waktu dokumen yang dibagikan, dengan siapa saja dokumen dibagikan dan hak akses apasaja yang diberikan. Kendala seperti inilah yang  dihadapi sehari-harinya dan cukup mengganggu fleksibelitas terutama dalam rutinitas pekerjaan, maka dibutuhkan konfigurasi firewall untuk meminimalisir gangguan tersebut sehingga layanan tetap bisa diakses
PEMETAAN PENGGUNAAN LAHAN DI WILAYAH KEPESISIRAN SEMBULANG PULAU GALANG KOTA BATAM
Authors: Roziqin Arif , Gustin Oktavianto , Irawan Sudra , Lubis Muhammad Zainuddin , Henora Citra Swari , Wulandari Dwi Anjen Setia
Published: August 2020

Aktivitas pembangunan yang tinggi berdampak pada dinamika perubahan penggunaan lahan, termasuk di wilayah kepesisiran. Penelitian ini bertujuan untuk mengetahui penggunaan lahan di wilayah kepesisiran Sembulang, Pulau Galang, Kota Batam. Informasi penggunaan lahan diperoleh dengan cara Interpretasi tutupan lahan pada  citra penginderaan jauh dan dilanjutkan dengan survei lapangan. Survei lapangan dilakukan pada tanggal 22 - 25 Maret 2019. Survei lapangan untuk melihat pemanfaatan langsung aktivitas manusia terhadap penggunaan lahan dilakukan ke semua titik wilayah kajian. Hasil penelitian menunjukkan bahwa, penggunaan lahan di wilayah kepesisiran Sembulang, Pulau Galang, Kota Batam seperti hutan, padang rumput, permukiman dan ekosistem mangrove. Fasilitas pemerintah yang berfungsi untuk pelayanan publik juga terdapat di wilayah ini, seperti  Kelurahan Sembulang dan Kecamatan Galang.
FINDEV (FISH FINDER AND VISUAL IMAGING REMOTE UNDERWATER VEHICLE) INOVASI ROBOT BAWAH AIR UNTUK MELAKUKAN PENCITRAAN VISUAL DAN PENJEJAK IKAN
Authors: Rindo Good , Samuel Samuel , Misbahudin Saefulloh , Maulana Tomi Ahmad , Aulia Mohamad Nur
Published: August 2020

Indonesia memiliki sumberdaya alam terutama sumberdaya perikanan yang melimpah, namun pada kenyataannya sumberdaya perikanan tersebut masih belum mampu untuk dipetakan sehingga para nelayan masih kesulitan untuk menemukan daerah penangkapan ikan. Penulis membuat prototipe Findev (Fish Finder and Visual Imaging Remote Underwater Vehicle) yaitu sebuah wahana bawah air yang mampu melakukan pencitraan visual dan penjejakan ikan. Findev menerapkan teknologi ROV atau Remotely Operated Vehicle dan prinsip hidrostatis equilibrium. Findev memiliki dimensi panjang total 535,5 mm, lebar total 304,2, dan tinggi 248 mm. Findev menggunakan kerangka yang terbuat dari material nylon yang memiliki tensile strength sebesar 700 – 850 kgf/cm2. Findev memiliki displacement sebesar 12,1 dengan densitas sebesar 1,599 g/cm3. Mampu beroperasi dikedalaman 20 m dengan tekanan hidrostatis sebesar 200,1 Mpa dan gaya tekan kebawah sebesar 118,58 N. Dengan motor bilge pump berkekuatan 1100 GPH dan daya rata – rata sebesar 56,72 Watt, Findev dapat bertahan selama 1 jam beroperasi di air. Sistem sonarnya didukung oleh sonar ventrior VT-FF001 yang memiliki jarak jangkau 325 kaki
Formação docente continuada: ensino hibrido e sala de aula invertida como recurso metodológico para o aprimoramento do profissional de educação
Authors: Martins de Morais Agnes Priscila , Franciely Souza Priscila
Published: August 2020

O presente artigo elege como objeto de estudo a formação docente continuada e o uso das tecnologias digitais e das Metodologias Ativas: sala de aula invertida e ensino híbrido como recurso metodológico para o aprimoramento do docente. Parte-se do pressuposto de que no atual contexto social o ensino convencional deve ser repensado, para que seja capaz de promover que os alunos sejam sujeitos ativos e autônomos do seu próprio processo de ensino-aprendizagem. Observa-se que o paradigma educacional necessita de transformações, assim como as decorrentes mudanças na sociedade devido ao uso das tecnologias digitais cada vez mais presentes. Desse modo, o presente trabalho tem como objetivo evidenciar a relevância da formação docente continuada para com o trabalho com as tecnologias digitais e uma mudança em sua prática pedagógica mediante ao trabalho com as Metodologias Ativas. Para a consecução deste estudo proposto, foi realizada uma pesquisa teórica que buscou embasamentos fundamentais para promover tal reflexão. Nesse sentido, o trabalho se justifica pela necessidade de propor uma reflexão sobre a importância das TDIC e as Metodologias Ativas para uma formação de alunos autônomos, mais críticos e reflexivos contribuindo com a sua formação cidadã. A reflexão deste estudo teve como pretensão incentivar futuros pesquisadores a utilizarem em suas aulas recursos mais interativos visando outras direções em relação ao ensino-aprendizagem.
Entrevista com Tania Regina de Souza Romero, professora da Universidade Federal de Lavras, em homenagem aos 10 anos do Programa de Mestrado Profissional em Educação da UFLA
Authors: Regina de Souza Romero Tania , Barbosa de Assis Márcio
Published: August 2020

Em comemoração aos 10 anos do curso Mestrado Profissional do Programa de Pós-graduação em Educação, da Universidade Federal de Lavras, realizamos uma entrevista com a professora Tania Regina de Souza Romero, professora permanente do Programa de Pós-graduação em Educação e do Programa de Pós-Graduação em Letras da Universidade Federal de Lavras.