bluuebunny/crossref_metadata_2025 huggingface dataset:
KEBERADAAN BAKTERI PELARUT FOSFAT DAN AKTIVITAS ENZIM FOSFATASE TANAH DAERAH PERAKARAN TANAMAN OBAT DARI KEBUN RAYA CIBODAS
Authors: Suliasih Suliasih
Published: August 2020

A study was undertaken to investigate to occurance of phosphate solubilizing bacteria from rhizosphere soil samples of medicine plants in Cibodas Botanical Garden. 13 soil samples of medicine plants are collected randomly The result shows that 71 isolates of phosphate solubilizing bacteria were isolated, and 10 species of these organism was identified as Azotobacter sp, Bacillus sp, Chromobacterium sp, C.violaceum, Citrobacter sp. , Enterobacter sp., E. liquefaciens. Nitrosomonas sp., Serratia rubidaea, Sphaerotillus natans. Azotobacter sp. And Bacillus sp. Are found in all of soil tested. Conversely, Serratia rubidaea is only in the sample from rhizosphere of Plantago mayor The activity of acid alkaline phosphatase in soil tested ranged from 0.78 â€“ 60,18 ugp nitrophenole/g/h, with the higest values being recorded in soil sample from rhizosphere of â€œLavenderâ€.Keywords : phosphate solubilizing bacteria, soil enzyme phosphatase
UTILIZATION OF RAWAPENING PEAT FOR NUTRIENT BLOCK AS A MEDIA NURSERIES Anthocephalus cadaba and Paraserianthes falcataria
Authors: Sittadewi., dkk E. Hanggari
Published: August 2020

Nutrient Block is a growing medium product in the form of a square (25 x 25 cm) or cylindrical (diameter = 20 cm, height = 25 cm) made of peat which has been composted, plus adhesive gypsum or tapioca waste. Nutrient Block is designed to support the post mining land rehabilitation program that is now threatening the environmental degradation in mining areas. Nutrient Block products has been proved good for growth because of the media in addition to having physical properties that are capable of storing large amounts of water, contain enough nutrients in the form available to plants,so it can support plant growth. Results of the Nutrient Block application test to Jabon (Anthocephalus cadaba) and Sengon (Paraserianthes falcataria) plants showed that good performance, both plant height and diameter of trees and leaf growth in plants Jabon appear healthy and getting wider.keywords: nutrient block, post-mining land rehabilitation. Paraserianthes falcataria, Anthocephalus cadaba
Narrative of Covids as Conspiracy on Youtube
Authors: Wahyudi Gemuh Surya , Akalili Awanis
Published: August 2020

Covid 19 pandemic which spread in Indonesia is not just science issue that shows a competition of scientist in developing theories and concepts to solve this problems. More important than science study, this issue also comes on the social study with some of naratives about conspiracy in media portals, one of them is YouTube. Using literature review method this research analyze what kind of narratives built by YouTube accounts that upload information about “Covid Conspiracy”. Analyze obtained from five YouTube accounts shows that Covid’s conspiracy narratives are built differently. From this paper, hopefully can describe audience are not just a consumers of media messages, but also media producers and how audience critical think and creativity create an information content about Covid conspirations on YouTube.
Preparation and characterization of colloidal CdTe nanoparticles by laser ablation in liquids
Authors: Salman Amenah Ali
Published: August 2020

Nanoparticles generation by laser ablation of a solid target in a liquid environment is an easy method. Cadmium Telluride (CdTe) colloidal nanoparticles have been synthesized by laser ablation Nd:YAG with wavelengths of 1064nm and double frequency at 532 nm, number of pulses 50 pulses, with pulse energy= 620mJ, 700mJ of a solid target CdTe is immersed in double distilled deionized water (DDIW) and in methanol liquid. Influences of the laser energy and different solutions on the formation and optical characterization of the CdTe nanoparticles have been studied using atomic force microscope (AFM) and the UV-Vis absorption. As a results, it leads to the absorbance in UV-Vis spectra of samples prepared in water at laser wavelength of 532nm is lower than the absorbance of 1064nm at same laser energy. AFM images show that CdTe NPs have spherical shape in nanometer size.
Quadrupole moments of exotic carbon isotopes (9C, 11C, 17C and 19C) including core polarization effect
Authors: A. Saeed Wael A. Saeed
Published: August 2020

Quadrupole Q moments and effective charges are calculated for 9C, 11C, 17C and 19C exotic nuclei using shell model calculations. Excitations out of major shell space are taken into account through a microscopic theory which are called core-polarization effects. The simple harmonic oscillator potential is used to generate the single particle matrix elements of 9,11,17,19C. The present calculations with core-polarization effects reproduced the experimental and theoretical data very well.
Effect of industrial powder on mechanical properties of glass fiber reinforced epoxy composite
Authors: Abdul-Hussein Aseel Basim
Published: August 2020

In the present study, composites were prepared by Hand lay-up molding and investigated. The composites constituents were epoxy resin as the matrix, 6% volume fractions of Glass Fibers (G.F) as reinforcement and 3%, 6% of industrial powder (Calcium Carbonate CaCO3, Potassium Carbonate K2CO3 and Sodium Carbonate Na2CO3) as filler. Density, water absorption, hardness test, flexural strength, shear stress measurements and tests were conducted to reveal their values for each type of composite material. The results showed that the non – reinforced epoxy have lower properties than composites material. Measured density results had show an incremental increase with volume fraction increase and water absorption, hardness, flexural strength and shear stress results had show an incremental increase with volume fraction increase and with smaller particle size.
Study and measurements of the uranium and amorphous crystals concentrations in urine samples of breast cancer female patients
Authors: Shafik Shafik S.
Published: August 2020

In this work, Kinetic Phosphorescence Analyzer (KPA) has been used to measure the concentrations of uranium (UC) and Amorphous crystals (AMO) in urine samples of breast cancer patients in Baghdad. Additionally, a relation between UC and AMO with respect to patient's age has been deduced and studied.Forty one urine samples of patients and five for healthy were taken from females lived in different residential area of Baghdad. The measured maximum UC value for urine samples of patients was 2.35 ± 0.053, the minimum value was 0.86 ± 0.034 μg/L, and an overall average was 1.6 ± 0.027 μg/L while the average UC for healthy females was 1.03 ± 0.020 μg/L.From these results, AMO concentrations were found for all breast cancer patients although those patients had not suffered from any kidney function. While all healthy women that tested against uranium and AMO, have been shown zero AMO. Further, UC increases with aging of patients and more incidence of breast cancer of females between the ages 40-59 years. Whereas the value of average AMO independents on the age of patients and also independents on the average value of UC, so the average of AMO is about "+++" for all patients' groups.
Electrical and morphological study of thermally evaporated (Sb2S3)1-xSnx thin films
Authors: Hasan Bushra A.
Published: August 2020

(Sb2S3)1-xSnx thin films with different concentrations (0, 0.05 and0.15) and thicknesses (300,500 and 700nm) have been deposited bysingle source vacuum thermal evaporation onto glass substrates atambient temperature to study the effect of tin content, thickness andon its structural morphology, and electrical properties. AFM studyrevealed that microstructure parameters such as crystallite size, androughness found to depend upon deposition conditions. The DCconductivity of the vacuum evaporated (Sb2S3)1-x Snx thin films wasmeasured in the temperature range (293-473)K and was found toincrease on order of magnitude with increase of thickness, and tincontent. The plot of conductivity with reciprocal temperaturesuggests, there are three activation energies Ea1, Ea2 and Ea3 for(Sb2S3)1-x Snx for all x content values and thicknesses whichdecreases with increasing tin content and thickness. Hall effectmeasurement showed that low thickness (Sb2S3)1-x Snx film exhibitn-type conductance whereas the film exhibit p-type towards thehigher thickness. The electric carrier concentration and mobilityshow opposite dependence upon tin content and thickness.
Study of the mechanical properties of Iron-Epoxy composite materials
Authors: Judran Abdulhadi K.
Published: August 2020

Iron-Epoxy composite samples were prepared by addeddifferent weight percentages (0, 5, 10, 15, and 20 wt %) from Ironparticles in the range of (30-40μm) as a particle size. The contentswere mixed carefully, and placed a circular dies with a diameter of2.5 cm. Different mechanical tests (Shore D Hardness, Tensilestrength, and Impact strength ) were carried out for all samples. Thesamples were immersed in water for ten weeks, and after two weeksthe samples were take-out and drying to conducting all mechanicaltests were repeated for all samples. The hardness values increasedwhen the Iron particle concentration increased while the Impactstrength is not affected by the increasing of Iron particlesconcentration. The tensile strength results reveal that the tensilestrength and the strain values of composite samples decreases whenthe Iron particles concentration increase. After conductedimmersion processes the results of hardness are reduced wears theresults of tensile strength and the impact strength are increased.
Copper nanoparticles prepared by pulsed exploding wire
Authors: Humud Hammad R.
Published: August 2020

In this work copper nanopowder was created at different liquidmedias like DDDW, ethylene glycol and Polyvinylpyrrolidone(PVP). Copper nanopowder prepared using explosion wire processand investigated the effects of the exploding energy, wire diameter,the type of liquid on the particle size, and the particles sizedistribution. The nanoparticles are characterized by x-ray diffraction,UV-visible absorption spectroscopy and transmission electronmicroscopy (TEM). The x-ray diffraction results reveal that thenanoparticles continue to routine lattice periodicity at reducedparticle size. The UV-Visible absorption spectrum of liquid solutionfor copper nanoparticles shows sharp and single surface Plasmonresonance (SPR) peak centered at a wavelength of 590 nm inethylene glycol media, but don’t have peak in PVP fluid. This peakindicated the production of pure and spherical copper nanoparticle.
A study of Fermi hole and partial Fermi hole for Li- and C-Atoms in different states 1s 2p, 1s 3p, 1s 3d and 2s 2p
Authors: M. Naeemah Ch.
Published: August 2020

The electron correlation effect for inter-shell have been analysed in terms of Fermi hole and partial Fermi hole for Li-atom in the excited states (1s2 3p) and (1s2 3d) using Hartree-Fock approximation (HF). Fermi hole Δf(r12) and partial Fermi hole Δg(r12 ,r1) were determined in position space. Each plot of the physical properties in this work is normalized to unity. The calculation was performed using Mathcad 14 program.
Study of charge density distributions, elastic charge form factors and root-mean square radii for 4He, 12C and 16O nuclei using Woods- Saxon and harmonic-oscillator potentials
Authors: Ridha Arkan R.
Published: August 2020

The nuclear charge density distributions, form factors andcorresponding proton, charge, neutron, and matter root mean squareradii for stable 4He, 12C, and 16O nuclei have been calculated usingsingle-particle radial wave functions of Woods-Saxon potential andharmonic-oscillator potential for comparison. The calculations for theground charge density distributions using the Woods-Saxon potentialshow good agreement with experimental data for 4He nucleus whilethe results for 12C and 16O nuclei are better in harmonic-oscillatorpotential. The calculated elastic charge form factors in Woods-Saxonpotential are better than the results of harmonic-oscillator potential.Finally, the calculated root mean square radii usingWoods-Saxonpotentials how overestimation in comparison with experimental dataon contrary to the results of harmonic-oscillator potential.
Charge density distributions and electron scattering form factors of 25Mg, 27Al and 29Si nuclei
Authors: Mahmood Lubna Abduljabbar
Published: August 2020

An effective two-body density operator for point nucleon systemfolded with the tenser force correlations( TC's), is produced and usedto derive an explicit form for ground state two-body charge densitydistributions (2BCDD's) applicable for 25Mg, 27Al and 29Si nuclei. It isfound that the inclusion of the two-body TC's has the feature ofincreasing the central part of the 2BCDD's significantly and reducingthe tail part of them slightly, i.e. it tends to increase the probability oftransferring the protons from the surface of the nucleus towards itscenteral region and consequently makes the nucleus to be more rigidthan the case when there is no TC's and also leads to decrease the1/ 2r 2 of the nucleus. It is also found that the effect of the TC's and theeffect of increasing the values of  on the 2BCDD's, elasticelectron scattering form factors and r2 1/ 2 are in the same directionfor all considered nuclei.
Core-polarization effect in longitudinal electron scattering form factors of 65Cu nucleus
Authors: Salman Adie D.
Published: August 2020

Inelastic longitudinal electron scattering form factors to 2+ and 4+ states in 65Cu nucleus has been calculated in the (2p3/2 1f 5/2 2p1/2) shell model space with the F5PVH effective interaction. The harmonic oscillator potential has been applied to calculate the wave functions of radial single-particle matrix elements. Two shell model codes, CP and NUSHELL are used to obtain results. The form factor of inelastic electron scattering to 1/21−, 1/22−, 3/22−, 3/23−, 5/21−, 5/22− and 7/2- states and finding the transition probabilities B (C2) (in units of e2 fm4) for these transitions and B (C4) (in units of e2 fm8) for the transition 7/2-, and comparing them with experimental data. Both the form factors and reduced transition probabilities with core-polarization effects gave a reasonable description of the experimental data.
Effect of tempering on thermal analysis of Al-Ti-Si alloy and its composites
Authors: Anaee Rana Afif
Published: August 2020

The investigation of the effect of tempering on thermal analysis ofAl-Ti-Si alloy and its composites with MgO and SiC particles wasperformed. Thermal analysis was performed before and aftertempering by DSC scan. Optical microscopy was used to identify thephases and precipitations that may be formed in base alloy andcomposites. X-ray diffraction test indicated that the Al3Ti is the mainphase in Al-Ti-Si alloy in addition to form Al5Ti7Si12 phase. Somechemical reactions can be occurred between reinforcements andmatrix such as MgO.Al2O3 in Al-Ti/MgO, and Al4C3 and Al(OH)3 inAl-Ti/SiC composite. X-ray florescence technique is used toinvestigate the chemical composition of the fabricated specimens.Heat treatment (Tempering) changes the microstructure of base alloyand its composites which was assessed by DSC scan. Generally,three main peaks appeared in DSC represented by GP zone, S phase(precipitations) and dissolution of phases or precipitations. Aftertempering, composite with SiC particles showed better results thanbase alloy and composite with MgO. Since the optical microscopyrevealed reforming the stable phase Al3Ti with evaporation somegases from composite. DSC analysis showed the stability ofcomposite with SiC was up to 270oC.
PANI/MWCNT based humidity sensor
Authors: Humud Hammad R.
Published: August 2020

Polyaniline Multi wall Carbon nanotube (PANI/MWCNTs) nanocomposite thin films have been prepared by Plasma jet polymerization at low frequency on glass substrate with preliminary deposited aluminum electrodes to form Al/PANI-MWCNT/Al surface-type capacitive humidity sensors, the gap between the electrodes about 50 μm and the MWCNTs weight concentration varied between 0, 1, 2, 3, 4%. The diameter of the MWCNTs was in the range of 8-15 nm and the length 10-55 μm. The capacitance-humidity relationships of the sensors were investigated at humidity levels from 35 to 90% RH. The electrical properties showed that the capacity increased with increasing relative humidity, and that the sensitivity of the sensor increases with the increase of the additive (MWCNTs); while each of the response time and the recovery time increasing with concentration. The change in MWCNTs concentration leads to a change in the energy gap as well as the initial capacity. The capacitance increases linearly with the relative humidity at MWCNTs concentration of 3% for thus the possibility of manufacturing humidity sensor with good specifications at this concentration.
Some electrical properties of PVA:PEG/MnCl2 thin film composites
Authors: Suhail Mahdi Hasan
Published: August 2020

PVA:PEG/MnCl2 composites have been prepared by adding (MnCl2) to the mixture of the poly vinyl alcohol (PVA) and poly ethylene glycol (PEG) with different weight percentages (0, 2, 4, 6, 8 and 10) wt.% by using casting method. The type of charge carriers, concentration (nH) and Hall mobility (μH) have been estimated from Hall measurements and show that the films of all concentration have a negative Hall coefficient. In D.C measurement increase temperature leads to decrease the electrical resistance. The D.C conductivity of the composites increases with the increasing of the concentration of additive particles and temperature. The activation energy decreases for all composites with increasing the concentration of the additive particles. The A.C conductivity increases with increasing of the frequency and the concentration of MnCl2 particles. The A.C electrical properties show that the dielectric constant and dielectric loss of the composites decrease with increasing of the frequency.
Effect of plasma jet on the water and hydrogen peroxide that used for assisted teeth bleaching
Authors: Humud Hammad R.
Published: August 2020

In this work the interaction of plasma jet with water and hydrogen peroxide liquids used for assisted teeth bleaching by plasma jet had been study. A homemade plasma jet system was used. The plasma jet supply by 15 W electrical power generated by high voltage power supply of 9.6 kV peak to peak and frequency of 33 kHz .this power supply generate high electric field on electrodes that would be enough to ionize the argon gas. Some important agents were study such as the effect of the Ar gas flow rates on the length of the plasma jet, the influence of plasma jet on some properties of water and two hydrogen peroxide concentrations 25 % and 30 % like pH, conductivity and liquid temperature for different exposure time. The liquids temperature was measured by digital infrared thermometer, the gas flow rate were measured by gas flow meter, the pH, and the conductivity was measured by pH conductivity ultra-meter. The results illustrated that the conductivity and liquid temperature increase with increasing of exposure time. It can be conclude that the liquid properties were changed less than the boundaries that could affect adversely to the cells that located in the plasma jet.
The effects of laser intensities on nonlinear properties for Ag nanoparticles colloid
Authors: Elias Mazin M.
Published: August 2020

A huge potential from researchers was presented for enhancing the nonlinear optical response for materials that interacts by light. In this work, we study the nonlinear optical response for chemically prepared nano- fluid of silver nanoparticles in de-ionized water with TSC (Tri-sodium citrate) protecting agent. By the means of self-defocusing technique and under CW 473 nm blue laser, the reflected diffraction pattern were observed and recorded by CCD camera. The results demonstrate that, the Ag nano-fluid shows a good third order nonlinear response and the magnitude of the nonlinear refractive index was in the order of 10−7 cm2/W. We determine the maximum change of the nonlinear refractive index and the related phase shift for the material at six input laser intensities.
Effect of Argon and oxygen pressure on Zn magnetron plasma produced by RF power supply
Authors: Aadim Kadhim A.
Published: August 2020

In this work, the plasma parameters (electron temperature andelectron density) were determined by optical emission spectroscopy(OES) produced by the RF magnetron Zn plasma produced byoxygen and argon at different working pressure. The spectrum wasrecorded by spectrometer supplied with CCD camera, computer andNIST standard of neutral and ionic lines of Zn, argon and oxygen.The effects of pressure on plasma parameters were studied and acomparison between the two gasses was made.
Study of effect acidic solution (HCl) and (EP/Al2O3 & EP/ TiO2) hybrid on thermal conductivity of epoxy resin.
Authors: Hameed Abdul Adeem Zaily
Published: August 2020

This research studies the effect of adding micro, nano and hybrid by ratio (1:1) of (Al2O3,TiO2) to epoxy resin on thermal conductivity before and after immersion in HCl acid for (14 day) with normality (0.3 N) at weight fraction (0.02, 0.04, 0.06, 0.08) and thickness (6mm). The results of thermal conductivity reveled that epoxy reinforced by (Al2O3) and mixture (TiO2+Al2O3) increases with increasing the weight fraction, but the thermal conductivity (k) a values for micro and Nano (TiO2) decrease with increasing the weight fraction of reinforced, while the immersion in acidic solution (HCl) that the (k) values after immersion more than the value in before immersion.
Nonlinear optical properties of polymer [PMMA] thin films doped with dye lasing compounds, Rhodamine 6G and Acriflavine in chloroform solvent by using dip coating method
Authors: Shafeeq Omar Shaker
Published: August 2020

The fluorescence emission of Rhodamine 6G (R6G) and Acriflavine dyes in PMMA polymer have been studied by changing the irradiation and exposure time of laser light to know the effect of this parameter. It was found that the fluorescence intensity decreases in the polymer samples doped dyes as the exposure time increases and then reaches stabilization at long times, this behavior called photobleaching, which have been shown in liquid phase less than solid phase. Using 2nd harmonic with wavelength 530 nm laser, the photobleaching effect in the two dye-doped polymers different solvent but same was studied. It was observed that photobleaching of by different solution and by using dip spin coating the photobleaching seem in liquid phase more than the thin films from the mixing solutions with a thickness of (0.1 to 1 micrometer). The maximum peak of fluorescence seems as red shift with different solvent concentration.
Optical emission spectroscopy for studying the exploding copper wire plasma parameters in distilled water
Authors: Humud Hammad R.
Published: August 2020

This work aims to study the exploding copper wire plasma parameters by optical emission spectroscopy. The emission spectra of the copper plasma have been recorded and analyzed The plasma electron temperature (Te), was calculated by Boltzmann plot, and the electron density (ne) calculated by using Stark broadening method for different copper wire diameter (0.18, 0.24 and 0.3 mm) and currentof 75A in distilled water. The hydrogen (Hα line) 656.279 nm was used to calculate the electron density for different wire diameters by Stark broadening. It was found that the electron density ne decrease from 22.4×1016 cm-3 to 17×1016 cm-3 with increasing wire diameter from 0.18 mm to 0.3 mm while the electron temperatures increase from 0.741 to 0.897 eV for the same wire diameters. The optical emission spectrum (OES) emitted from the plasma have Hα line, small peak at 590 nm corresponding to sodium and others peaks belong to Cu I. The relationship between the plasma electron temperature, emission line intensity and number density with the formed copper nanoparticles size and concentration were studied. It was found that the nanoparticles concentration increase with emission line intensity while its size decrease. It can be conclude the existence of a controlled relationship between the plasma parameters and the formed nanoparticles concentration and size.
Preparation of unsaturated polyester/nano ceramic composite and study electric, thermal and mechanical properties
Authors: Mahdie Shatha H.
Published: August 2020

The composites were manufactured and study the effect of addition of filler (nanoparticles SiO2 treated with silane) at different weight ratios (1, 2, 3, 4 and 5) %, on electrical, mechanical and thermal properties. Materials were mixed with each other using an ultrasound, and then pour the mixture into the molds to suit all measurements. The electrical characteristics were studied within a range of frequencies (50-1M) Hz at room temperature, where the best results were shown at the fill ratio (1%), and thermal properties at (X=3 %), the mechanical properties at the filler ratio (2%).
SiO2 particles effect on the mechanical properties of the starch/PVA blends
Authors: H. Nahida J.
Published: August 2020

The present work studies the mechanical properties of SiO2 μPs, and NPs in St/PVA blends. The samples were prepared by casting method as PVA, St/PVA blends at different concentrations (30, 40, 50, and 60 %). DSC and TGA tests were carried out to the samples evolved. The result showed a single glass transition temperature (Tg) for all St /PVA blends that was attributed to the good miscibility of the blends involved. It was found that (Tg) decrease with starch ratio increase. It was seen that (PVA) of (Tg=105 oC); The glass transition temperature which was decrease with starch ratio that was attributed to glass transition relaxation process due to micro-Brownian motion of the main chain back bond. The endothermic peak at 200 oC was attributed to melting point of (PVA). Thermal properties of PVA; and St /PVA blends at different concentration (30, 40, 50, and 60 %) were evaluated by thermo gravimetric analysis (TGA). The analyses were carried out from 20 to 600 oC at 10 oC)/min heating rate in air oxygen atmosphere. The weight loss stages depended on polymer system. The starch addition causing shifting in the second degradation temperature to the higher temperature; which result in overlapping between the two main degradation steps, these result was attributed to the St/ PVA blend compatibility. The mechanical properties results showed a decrease in ultimate strength with starch ratio increase. The ultimate strength of (PVA) was (47 MPa), whereas the ultimate strength of 60 %St/PVA was (11 MPa) and for 30 %St/PVA was the highest ultimate strength of blends involved (26 MPa). SiO2μPs (753.7 nm), and NPs (263.1 nm) were added at different concentrations (1.5, 2, and 2.5 %). 1.5% SiO2μPs, and NPs of the best ultimate strength (69 MPa), (86 MPa) respectively then it was decreased by SiO2μPs, and NPs increase. Optical microscope of the samples involved was investigated. It was concluded the prepared samples were suggested to be used as packaging materials for agriculture application and its ultimate strength could be controlled by SiO2μPs, and NPs addition.
The antibacterial activity of indium oxide thin film prepared by thermal deposition
Authors: Salman Odai N.
Published: August 2020

Indium oxide In2O3 thin films fabricated using thermal evaporation of indium metal in vacuum on a glass substrate at 25oC using array mask, after deposition the indium films have been subjected to thermal oxidation at temperature 400 °C for 1h. The results of prepared Indium oxide reveal the oxidation method as a strong effect on the morphology and optical properties of the samples as fabricated. The band gap (Eg) of In2O3 films at 400 °C is 2.7 eV. Then, SEM and XRD measurements are also used to investigate the morphology and structure of the indium oxide In2O3 thin films. The antimicrobial activity of indium oxide In2O3 thin films was assessed against gram-negative bacterium using inhibition zone of bacteria which improved higher inactivation rate observed for gram-negative bacteria and reduced resistance of membrane due to reactive oxygen species generated by thermal oxidation.
Analytical study of high absorption region of the absorption edge of a-Si:H using nonlinear regression method
Authors: Hussian Ali Ch.
Published: August 2020

This research is concerned with the re-analysis of optical data (the imaginary part of the dielectric function as a function of photon energy E) of a-Si:H films prepared by Jackson et al. and Ferlauto et al. through using nonlinear regression fitting we estimated the optical energy gap and the deviation from the Tauc model by considering the parameter of energy photon-dependence of the momentum matrix element of the p as a free parameter by assuming that density of states distribution to be a square root function. It is observed for films prepared by Jackson et al. that the value of the parameter p for the photon energy range is is close to the value assumed by the Cody model and the optical gap energy is which is also close to the value of the Cody gap of these films. While for the films prepared by Ferlauto et al. the value of the parameter is equal to and .
The influence of magnetic field and cathode dimensions on plasma characteristics in hollow cathode system
Authors: Abbas Qusay Adnan
Published: August 2020

Experimental study on the effect of cylindrical hollow cathode, working pressure and magnetic field on spatial glow distribution and the characteristics of plasma produced by dc discharge in Argon gas, were investigated by image analyses for the plume within the plasma. It was found that the emission intensity appears as a periodic structure with many peaks appeared between the electrodes. Increasing the pressure leads to increase the number of intensity peaks finally converted to continuous form at high pressure, especially with applied of magnetic field, i.e. the plasma is more stable with the presence of magnetic field. The emission intensity study of plasma showed that the intensity has a maximum value at 1.07 mbar pressure and decrease with more pressure.
Influence of cobalt substitution on the properties of Ni0.95-xCoxCu0.05Fe2O4 ferrite nanoparticles
Authors: Dahham Najat A.
Published: August 2020

Cobalt substituted nickel copper ferrite samples with general formula Ni0.95-xCoxCu0.05Fe2O4, where (x= 0.00, 0.01, 0.02, 0.03, 0.04 and 0.05) were prepared by solid-state reactions method at 1373 K for 4h. The samples prepared were examined by X-ray diffraction (XRD(, atomic force microscope (AFM), Fourier transform infra-red spectroscopy (FTIR) and Vickers hardness. X-ray diffraction patterns confirm the formation of a single phase of cubic spinel structure in all the prepared samples . XRD analysis showed that the increase in the cobalt concentration causes an increase in the lattice constant, bulk density (ρm) and the x-ray density (ρx), whereas porosity (p) and crystallite size (D) decrease. The Topography of the surface observed was found to be more uniform and homogeneous when the cobalt concentration increases, leading to a decrease in the roughness of the surface while average grains size increases. The FTIR spectra show two absorption bands, namely the high frequency band (υ1) in the range (1078-1081) cm-1 and the low frequency band (υ2) in the range (418–459) cm-1, which due to the vibrations of the tetrahedral and octahedral sites of Fe+3–O−2, respectively, these bands confirm the spinel structure of the prepared ferrite nanoparticles. Vickers hardness was found to increase with cobalt concentration increases.
The study of the bending property of the epoxy (Ep / MgO) and (Ep/SiO2) composites in natural conditions and after immersion in chemical solution
Authors: Ibrahim Baraa Khalil
Published: August 2020

In this paper, a polymer-based composite material was prepared by hand Lay-up method consisting of epoxy resin as a base material reinforced by magnesium oxide powder once and silicon dioxide powder again and with different weight ratios (3, 6, 9 and 12) wt %. The three-point bending test was performed in normal conditions and after immersion in sulfuric acid. The results showed that the bending value decreased with the increase of the weighted ratio of the reinforcement material (MgO, SiO2). The Bending of samples reinforced by SiO2 was found to be less than the bending of samples reinforced by particles (MgO). For example, the bending of the SiO2 sample (0.32 mm) at the weighted ratio (3%) and for the MgO (0.18mm) sample at the weight ratio were the same weighted load (100 g). It was found that the bending values of all samples exceeded the value after immersion in sulfuric acid. For example, the percentage of weight (6%) at the load level (500 g) was changed from 1.16 mm in normal conditions to 1.48mm for the same weight ratio after immersion. In sulfuric acid diluted with 0.3N for 10 days at the same applied load.
Study of nuclear structure for carbon isotopes using local scale transformation technique in shell model
Authors: Mohammed Saja H.
Published: August 2020

This work is devoted to study the properties of the ground states such as the root-mean square ( ) proton, charge, neutron and matter radii, nuclear density distributions and elastic electron scattering charge form factors for Carbon Isotopes (9C, 12C, 13C, 15C, 16C, 17C, 19C and 22C). The calculations are based on two approaches; the first is by applying the transformed harmonic-oscillator (THO) wavefunctions in local scale transformation (LST) to all nuclear subshells for only 9C, 12C, 13C and 22C. In the second approach, the 9C, 15C, 16C, 17C and 19C isotopes are studied by dividing the whole nuclear system into two parts; the first is the compact core part and the second is the halo part. The core and halo parts are studied using the radial wave functions of HO and THO radial wavefunctions, respectively. For 9C, 12C and 13C isotopes, the no-core shell model (NCSM) are studied using the Warburton-Brown interaction. Very good agreements are obtained for the calculated density distributions and form factors in comparison with experimental data.
Ag-SiO2 nanoparticales prepared by Sol-Gel methods for antibacterial effect
Authors: Mohammed Ch. H.
Published: August 2020

Sol-gel method was use to prepare Ag-SiO2 nanoparticles. Crystal structure of the nanocomposite was investigated by means of X-ray diffraction patterns while the color intensity was evaluated by spectrophotometry. The morphology analysis using atomic force microscopy showed that the average grain sizes were in range (68.96-75.81 nm) for all samples. The characterization of Ag-SiO2 nanoparticles were investigated by using Scanning Electron Microscopy (SEM). Ag-SiO2 NPs are highly stable and have significant effect on both Gram positive and negative bacteria. Antibacterial properties of the nanocomposite were tested with the use of Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) bacteria. The results have shown antibacterial effect of the Ag-SiO2 prepared as nanogel and nanopowder states, while the Ag-SiO2 nanopowder showed the highest capability against S. aureus. Both methods of biofilm showed an inhibition effect for Ag-SiO2 NPs, the synthetic Ag-SiO2 NPs showed highest inhibition effect on Gram positive bacteria S. aureus by using the biofilm microtiter method.
Impact strength behaviour of PMMA denture base through addition of different nanoparticles after immersion in some nutrition liquids
Authors: Rasheed Zaynab N. , Hussain Samah M.
Published: August 2020

Poly methyl methacrylate PMMA polymer could be considered the main material that used mostly in the recent years in denture base fabrication. It commonly known by it is poor strength properties such as low impact strength. The aim of the present research was to enhance the performance of PMMA denture base through the addition of two kind of nanoparticles (nano particles that selected from artificial and natural sources). Nano -particles from both Al2O3 and crushed peanut Peel were used for comparing purposes.Various weight fraction used in this study for both kinds of the additive (1%, 2% and 3%). Moreover, in this work a study and evaluation in impact strength (I.S.) value were done before and after immersion. The new prepared nanocomposite in three different liquids (mineral water, natural lemon juice and Pepsi) immersed during three specific time (10, 20 and 30 min), all tests completed at room temperature. It was found that the impact strength value before immersion decreased gradually during reinforcement with both type of nanoparticles except when using 3% of Peanuts Peel nanoparticles. Also, it was found after immersion pure PMMA in the three different liquid that the value of I.S. decreased. When immersion the prepared sample inside mineral water, it was noted that using Al2O3 as reinforcement the determined value decrease with increasing the weight fraction different from the Peanuts Peel. The obtained results showed that immersion these samples in naturel lemon juice increased the value of impact strength gradually with the time. I.S. value decreased while immersion nanocomposite of Al2O3 with Pepsi, while an obvious increase was clear with nanocomposite of Peanuts Peel with the immersion time.
Characterization of biochar (bio carbon) on the properties of plasticized polylactic acid composites for antistatic packaging
Authors: Ali Nadia A.
Published: August 2020

A new  light-weight nanocarbon prepared by spray-drying method  to obtain  particle size is 21.7 nm based of polylactic acid biodegradable film in antistatic packaging .Bio carbon (biochar) is  obtained from  plants and soils to naturally absorb and store carbon dioxide from the atmosphere . Therefor it has been used to support biodegradable polylactic acid (PLA) with to obtain 100% recyclable material.

Using plasticizer thymol of polylactic acid and biochar (bio carbon) as composites were prepared by a solution casting method with (0.5-10)wt% biochar. The composites  characterized by  FTIR, electrical conductivity, mechanical properties , contact angle and Colar and Brightness . Results show that electrical conductivity of increased with increased biochar and makes the composite lower resistive and appropriate for use as antistatic packaging for the transportation and store of electronic components, mechanical tests show reduced the tensile strength and   tensile modulus but increased in  elongation, Tear Resistance and Hardness because used thymol as plasticizers  at PLA/thymol  (95/5) and films composites change from brittle to ductile   . The results of contact angle of pure PLA is 83◦ that mean hydrophobic materials and decreased to 54◦ at PLA/thymol/biochar 10% to obtain hydrophilic materials that able to dissipate or promote the decay of static electricity and improve process ability of electronic device. Optical such as Color and Brightness show that decreased but suitable for antistatic packaging   and became opacity at 10% biochar.
Effect of cation size on electrochemical properties of polymer electrolyte
Authors: Jawad Mohammed kadhim
Published: August 2020

This study investigates the ionic conduction dependence on the size of alkaline cations in gel polymer electrolytes based on double iodide can enhance by incorporating a salt having a bulky cation. Group of gel polymer electrolytes with polyethylene oxide (PEO) as a host matrix based on double salts potassium iodide (KI) and rubidium iodide (RbI) with different weight ratio prepared by using solution cast technique.  The maximum value of conductivity reaches (6.03 10⁻3 at 293 K) S/cm for an electrolyte which content (KI 45%, RbI 5%) from binary salt. The ionic conductivity of for gel polymer electrolytes gradually increases by increasing temperature. The real dielectric constant results confirm that the dielectric behavior of the PEO material is a thermally activated process. FTIR results confirm that the shifting of peaks is another way to prove the interactions between PEO and binary salt ascribed to the formation of a transient cross-linking complex between the cations of the ionic liquids and the ether oxygen of the PEO.
The DC electrical Conductivity of prepared pure polypyrrole and polypyrrole /graphene (PPY/GN) nanocomposite by in-situ polymerization
Authors: Ahmed Fatima mikdad , Hassan Salma Mohammad , Kamil Mohanad Irzooqi
Published: August 2020

Abstract

 In this work, pure Polypyrrole (PPy) and Polypyrrole (PPy)/Graphene (GN) was synthesized by in-situ polymerization in different weight percentages (0.1, 0.3, 0.5, 1, 3 and 5 wt.% (g)) of GN nano particles using chemical oxidation method at room temperature. The FTIR, SEM and electrical properties were studies for the nano composites. The result show that when concentration of GN Nano particle increase, the electrical conductivity increased and the graphene sheets were merging to form a continuous area of the GN through the polypyrrole base material. The FTIR spectra shows that the characteristics absorption peaks of polypyrrole that is, 1546.80, 1463.87 and 3400.27 cm-1(stretching vibration in the pyrrole ring), and at 1080.06 cm-1 was assigned to C—O stretching and at 1589.23 cm-1 was assigned to C—C vibration of carbon ring in graphene.

الخلاصة

حضر البولي بايرول النقي و المطعم بدرجة حرارة الغرفه بطريقة الاكسدة الكيميائية و قد تم استخدام جسيمات الكرافين النانوية و بالنسب التالية (0.1, 0.3, 0.5, 1. 3, ,5 %). و تم استخدام طيف الاشعه تحت الحمراء و ماسح الالكترون المجهري لتشخيص البولي بايرول المحضر كما قيست التوصيلية الكهربائية المستمرة و اوجدت النتائج ان التوصيلية تزداد بزيادة درجه الحرارة و كذالك بزيادة الكرافين .
Study the performance of pentacene based organic field effect transistor by using monolayer, bilayer and trilayer with different gate insulators
Authors: Mohammed Bushra H. , Abdullah Estabraq Talib
Published: August 2020

In this paper, Pentacene based-organic field effect transistors (OFETs) by using different layers (monolayer, bilayer and trilayer) for three different gate insulators (ZrO2, PVA and CYEPL) were studied its current–voltage (I-V) characteristics by using the gradual-channel approximation model. The device exhibits a typical output curve of a field-effect transistor (FET). Source-drain voltage (Vds) was also investigated to study the effects of gate dielectric on electrical performance for OFET. The effect of capacitancesemiconductor in performance OFETs was considered. The values of current and transconductance which calculated using MATLAB simulation. It exhibited a value of current increase with increasing source-drain voltage.
Optimum diameter for laser beam and effect of temperature rise on the optical bistability hysteresis loops
Authors: Khidhir Ali Hassan
Published: August 2020

In this research, analytical study for simulating a Fabry-Perot bistable etalon (F-P cavity) filled with a dispersive optimized nonlinear optical material (Kerr type) such as semiconductors Indium Antimonide (InSb). An optimization procedure using reflective (~85%) InSb etalon (~50µm) thick is described. For this etalon with a (50 µm) spot diameter beam, the minimum switching power is (~0.078 mW) and switching time is (~150 ns), leading to a switching energy of (~11.77 pJ) for this device. Also, the main role played by the temperature to change the etalon characteristic from nonlinear to linear dynamics.
Theoretical Model for Spectroscopic Study of Cu+2, Co+2, and Fe+3 Dissolved in Ethanol with A Different Concentrations
Authors: Al-sharuee Israa F.
Published: August 2020

The absorption spectrum for three types of metal ions in different concentrations has been studying experimentally and theoretically. The examination model is by Gaius model in order to find the best fitting curve and the equation controlled with this behavior. The three metal ions are (Copper chloride Cu+2, Iron chloride Fe+3, and Cobalt chloride Co+2) with different concentrations (10-4, 10-5, 10-6, 10-7) gm/m3. The spectroscopic study included UV-visible and fluorescence spectrum for all different concentrations sample. The results refer to several peaks that appear from the absorption spectrum in the high concentration of all metal ions solution. The multiple absorption peaks continued even at the lowest concentration in the iron ion solution. Fluorescence spectrum shows intensive stimulating of the radiation strength was perceived in the manifestation of Cu+2, Co+2 and Fe+3. From modeling investigation, there are converge between experimental and theoretical results of the fluorescence spectrum for metal ions. Furthermore, identity and convergence which defined as (r2), are on average (0.995).
Activity Of Lingzhi Fungan Ethanol Extract (Ganoderma Lucidum) Using Soxhlet Method For Bacteria Propionibacterium Acnes
Authors: Handrianto Prasetyo
Published: August 2020

The purpose of this study is to know Lingzhi Mushroom extract (Ganoderma Lucidum) has antimicrobial activity against Propionibacterium acnes using Ethanol Solvent, the method used is the disc diffusion method using 6 repetitions, the concentration used is 20 µg / ml, 40 µg / ml, 60 µg / ml / ml, 80 µg / ml and 100 µg / ml, Lingzhi mushroom was extracted using ethanol solvent with the Soxhlet method. The results of the research data showed that the largest inhibitory zone was shown at a concentration of 100 µg / ml of 6.91 mm with a medium inhibitory category. The conclusion of this research is the Lingzhi mushroom is able to inhibit the activity of Propionibacterium acnes in the medium category.
KAJIAN PROYEKSI PEMENUHAN KEBUTUHAN ENERGI PROVINSI KEPULAUAN RIAU
Authors: Saputra Ihsan , Istardi Didi , Ansori Muslim , Nugroho Cahyo Budi , Maskarai Abulija
Published: August 2020

Energi memiliki peranan penting dalam perkembangan pertumbuhan ekonomi dan pertumbuhan industri baik jangka panjang maupun jangka pendek. Dengan tingkat pertumbuhan ekonomi 5,02% dan tingkat pertumbuhan penduduk 1,79% tiap tahun di Provinsi Kepulauan Riau, perlu direncanakan dengan baik strategi pemenuhan energi. Pada penelitian ini akan dikaji tentang sumber energi dan kebutuhan energi di Provinsi Kepulauan Riau. Selain itu dilakukan pemodelan menggunakan LEAP untuk memprediksi kebutuhan energi hingga tahun 2025 di Provinsi Kepulauan Riau. Dari hasil penelitian didapat kebutuhan energi Kepulauan Riau didominasi oleh kebutuh Natural Gas sebesar 53% dari total 1,73 Mtoe pada tahun 2015 dan sektor pengguna paling besar adalah sektor rumah tangga dan industri. Selain itu dari hasil proyeksi penggunaan energi, tahun 2025 energi paling besar di konsumsi adalah Natural gas sebesar 0,98 Mtoe dari total 2,4 Mtoe dan sektor pengguna paling besar adalah sektor industri. Produksi Natural gas dan minyak bumi provinsi kepulauan riau menurun tiap tahunnya sehingga perlu dilakukan diversifikasi energi untuk pemenuhan kebutuhan energi di Provinsi Kepulauan Riau.
PENGEMBANGAN JARINGAN INTERNET WIRELESS DENGAN WIFI OVERVIEW PADA OBYEK WISATA BLANGSINGA WATERFALL
Authors: Suta Atmaja I Made Ari Dwi , Arya Astawa I Nyoman Gede , Sukarata Putu Gde
Published: August 2020

Blangsinga Waterfall merupakan salah satu objek wisata dengan kondisi geografis yang sangat ekstrim, Dimana area tersebut belum tercover sinyal GSM akibatnya wisatawan tidak bisa mengakses jaringan internet. Tujuan penelitian ini adalah menentukan spot infrastruktur jaringan Wireless serta Hotspot dan kemudian melakukan pengukuran kekuatan sinyal untuk coverage areal wisata. Berdasarkan analisa lapangan ditentukan 3 (tiga) titik untuk pembangunan jaringan dan penempatan Access Point sebagai Hotspot. Implementasi diawali dengan membangun jaringan LAN. Kemudian untuk scanning channel dan pengujian sinyal access point digunakan tools Wifi Overview. Pengujian kekuatan sinyal dilakukan di sekitar areal tempat wisata dengan mengambil jarak 5m, 10m, dan 15m  ke segala arah dari Access point ditempatkan. Hasil yang dicapai adalah terbangunnya internetworking untuk areal wisata Blangsinga Waterfall. Hasil berikutnya adalah adanya akses internet dimana semua areal wisata ter-cover sinyal wifi. Dengan terbangunnya infrastruktur internet, wisatawan mendapatkan akses komunikasi lebih mudah serta pengelola tempat wisata dapat mengembangkan fasilitas lain dengan berdasar jaringan internet yang sudah dibangun.