bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the Cloud Web services: A Review
Authors: Okoro R. , Idowu S.A. 
Published: May 2018

Cloud Computing is a constantly evolving IT generic term used to refer to various IT solutions and services provided via the internet. Precisely, cloud computing can be said to be Â theÂ delivery of scalable IT resources over the Internet, as opposed to hosting and operating those resources locally; these resources can include applications and services, as well as the infrastructure on which they operate (EDUCAUSE 2009). So instead of spending money on applications and hardware, individuals and businesses have access to same resources without the commitment of ownership to vendors who provide on-demand services such as Customer Relationship Management (CRM), off-site storage, hosted email solutions, secure web portals, etc. Despite some seemingly security challenges that confront total adoption of Cloud computing by business organizations and educational institutions, the benefits of using services provided by Cloud technology still outweigh the perceived challenges. It is the aim of this paper to present an expository review of services that can run on the cloud thereby providing excellent opportunities for business groups and academics institutions. The paper also provides a contribution to the propagation of the adoption of cloud technology.
STUDY OF INCREASE IN GLOBAL COMPONENTS IN HYBRID WAVELETS ON DATA COMPRESSION
Authors: Kekre Dr. H.B. , Sarode Dr.Tanuja , Natu Prachi 
Published: May 2018

This paper presents a hybrid wavelet transform technique which studies the effect of global components on the quality of image compression. Hybrid wavelet transform is generated using two different component orthogonal transforms. One orthogonal transform represents global featuresof image in betterway and another is used to represent local features. Walsh transform of size 8x8 is used as a base transform i.e. to represent global characteristics of image. Other transforms like DCT, Discrete Real Fourier Transform,DiscreteHartley transform (DHT), Discrete Sine Transform (DST), Discrete Kekre Transform (DKT) and Slant transform of size 32x32 are used to focus on local characteristics of an image.256x256 hybrid wavelet transform is generated and multiple iterations of global components are included using columns of base transform and its effect on reconstructed image quality is observed in terms of Root Mean Square Error (RMSE) and Peak Signal to Noise Ratio (PSNR). Â From the experiments it has been observed that when DCT is used to extract local features, best results are obtained among all combinations with Walsh transform. These results are also compared with Walsh transform and observed to be much superior at higher compression ratios giving better image quality.
Performance Comparison of Wavelets Generated from Four Different Orthogonal Transforms for Watermarking With Various Attacks
Authors: Kekre H. B. , Sarode Tanuja , Natu Shachi 
Published: May 2018

This paper proposes a watermarking technique using different orthogonal wavelet transforms like Hartley wavelet, Kekrewavelet, Slant wavelet and Real Fourier wavelet transform generated from corresponding orthogonal transform. Theseorthogonal wavelet transforms have been generated using different sizes of component orthogonal transform matrices.For example 256*256 size orthogonal wavelet transform can be generated using 128*128 and 2*2 size componentorthogonal transform. It can also be generated using 64*64 and 4*4, 32*32 and 8*8, 16*16 and 16*16 size componentorthogonal transform matrices. In this paper the focus is to compare the performance of above mentioned transformsgenerated using 128*128 and 2*2 size component orthogonal transform and 64*64 and 4*4 size component orthogonaltransform in digital image watermarking. The other two combinations are not considered as their performance iscomparatively not as good. Comparison shows that wavelet transforms generated using (128,2) combination of orthogonalÂ transform give better performances than wavelet transforms generated using (64,4) combination of orthogonaltransformfor contrast stretching, cropping, Gaussian noise, histogram equalization and resizing attacks. Real Fourierwavelet and Slant wavelet prove to be better for histogram equalization and resizing attack respectively than DCT waveletand Walsh wavelet based watermarking presented in previous work.
COMPARISON OF EFFICIENCY OF APM AND MNO2 BY PHOTOCATALYTICAL DEGRADATION OF AZURE-B BASED ON QUALITY PARAMETER MODIFICATION
Authors: Jakar Swati , Chaturvedi Ramakant , Sharma Mohan Kumar 
Published: May 2018

This paper describes the comparison of photocatalytical activity of Ammonium Phosphomolybdate(APM) and Manganese(IV) Oxide forphotocatalytic degradation of Azure-B. This study is based on modificationsin quality parameters which take place during optimum photocatalytic degradation of Azure-B contaminated water using two hetrocatalystAmmonium Phosphomolybdate and Manganese(IV) Oxide separately. Various quality parameterslike pH, Alkalinity, Hardness, COD, BOD, DO, Conductivity, Salinity, TDS, and Concentration of Ca+2, Mg+2, Cl-, F-, NO3-, SO4-2 and turbidity were used for comparison.
EX-SITU PREPARED NAFION–IONIC LIQUID COATED MERCURY FILM ELECTRODE FOR ADSORPTIVE STRIPPING VOLTAMMETRY OF LEAD IN THE PRESENCE OF AMARANTH
Authors: Nagles Edgar Orlando , Arancibia Verónica 
Published: May 2018

Nafion combined with ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM]F3MSO3) coated with mercury film (NLIHgFE) on a glassy carbon electrode modified allow the determine Pb(II) by adsorptive stripping voltammetry in the presence of Amaranth (Am). Properties of the NLIHgFE were characterized by square wave without and in the presence of other ionic liquid´s with different anion where ([EMIM]F3MSO3) showed to be more convenient in the determination the lead compared with other ionics liquids with smaller anions. pH 2.6 with buffer Britton-Robinson the complex Am-Pb was accumulated by adsorption on surface of the working electrode at -0.3 V by 80 s. and later reduce at negative potential by square wave and current peak appeared at -0.51 V earmarked to the reduction of lead in the complex. The linear calibration curves with ranged from 0.9–12.0 µgL–1 for Pb(II). The detection limits (3s) were estimated to be around 0.4 µgL–1 to Pb(II) . The relative standard deviations were 2.0 % at the 4.9 µg L–1 level of Pb(II) with 80 s of accumulation (n=7). Other optimal conditions were (CAm 0.77 µmol L–1; Eads –0.3 V; Frecuency 15 Hz and Amplitud pulse 25 mV). The methods were validated using reference material waste waters (SPS–WW1). Finally, the method was successfully applied to the determination of Pb(II) in tap water after UV digestion.
Performances of nanofiltration on industrial phosphoric acid purification
Authors: Nasri Hassen , Ben Amar Raja 
Published: May 2018

Phosphoric acid production is of major importance to the Tunisian economy. However, the quality produced is not suitable for other than agricultural use due to mineral and organic impurities. In this study, the purification of industrial phosphoric acid with a maximum P2O5 concentration of 25% was achieved by nanofiltration. Six solutions of different P2O5 concentration were used. The removal of organic (total carbon) and inorganic impurities such as magnesium, iron, chrome, zinc, cadmium and vanadium, were studied.The performances of nanofiltration (NF) Nadir NP 30 membrane were determined in terms of permeate flux and P2O5 and impurities retention taking into account the effect of transmembrane pressure, P2O5 concentration and membrane prea-treatment by purified phosphoric acid solution.Results showed that for the industrial 25% P2O5 acid solution, the use of NF membrane achieved a retention of 87.35%, 86.73%, 87.57%, 78.41% and 73.17%, respectively, for iron, aluminum, chrome, magnesium, vanadium and organic matter (kerogen and humic acids) under a pressure of 20 bar. P2O5 permeation increased with the increase of its concentration in the acidic feed solution. The best permeation is provided by 25% P2O5 feeding acid solution which is of almost 98%.
Preparation and Characterization of bis (4-methoxyanilinium) tetrachlorozincate
Authors: Rahmouni H. , Sta W. Smirani , Rzaigui M. 
Published: May 2018

A new zinc complex of formula [C7H10NO]2 ZnCl4 has been prepared and characterized by X-ray diffraction, IR and UV-Visible spectroscopies. The complex crystallizes in the monoclinic space group P21/n with a minimal tetrahedral distortion of the ZnCl42- ion and with lattice parameters: a =12.054 (2) Å, b =7.129 (3) Å, c =23.480 (2) Å, β = 100.67 (2)°, V = 1983.03 (1) Å3 and Z = 4. The crystal structure was solved and refined to R = 0.080 and RW = 0.227 with 9611 independent reflections. It can be described by organic layers of p-anisidinium cations held together by C-H…O hydrogen bonds parallel to (010) plane, linked to the inorganic groups of ZnCl42- anions through N-H…Cl hydrogen bonds, electrostatic and Van Der Waals interactions, to form a three-dimensional network.
Activity and stability of immobilized Candida rugosa lipase on chitosan coated Fe3O4 nanoparticles in aqueous and organic media
Authors: Abd-Elhakeem Mohamed A. , Elsayed Ahmed M. , Alkhulaqi Taher A. 
Published: May 2018

Fe3O4 (magnetite) nanoparticles were prepared by coprecipitation method, coated by chitosan and functionalized by glutaraldehyde. Lipase enzyme from Candida rugosa was immobilized on the prepared particles via cross linking reaction. Synthesis steps and characterization were examined by XRD, TEM, and FTIR.
The immobilization conditions were 10 mL of phosphate buffer (0.1 M, pH 6.5) containing 30 mg of functionalized magnetic chitosan nanoparticles and 2.0 mg·mL-1 of lipase, immobilization temperature of 4 ℃ and immobilization time of 1 h. Under these conditions, lipase was successfully immobilized with loading capacity of 87 mg/g.
The immobilized enzyme showed good operational and storage stability, where it remained stable after 30 days of storage at 4◦C.and retained about 61% of its initial activity after twenty repeated uses. Finally enzymatic catalyze synthesis of butyl and hexyl oleate at 40 ◦C with shaking (200 rpm) was realized in n-hexane and confirmed by GC analysis.
SYNTHESIS AND REACTIONS OF SOME NEW MORPHOLINYLPYRROLYL TETRAHYDROTHIENO[2,3-c] ISOQUINOLINE
Authors: Zaki Remon Melad , Kamal El-Dean Adel M. , Radwan Shaban M. 
Published: May 2018

Hydrazinolysis of ethyl-5-morpholin-4-yl-1-(1H-pyrrol-1-yl)-6,7,8,9-tetrahydrothieno[2,3-c]iso- quinoline-2-carboxylate afforded the corresponding carbo- hydrazide which upon condensation with aromatic aldehydes, acetyl acetone and/ or carbon disulfide gave N- arylidinecarbohydrazide, dimethylpyrazolyl methanone, [1,3,4]oxadiazole-2-thiol and its ethyl ester derivatives respectively. Diazotization of the carbohydrazide with nitrous acid afforded the corresponding carboazide which was used for synthesis of carbamates and substituted carboxamides. Boiling of the carboazide in dry xylene afforded the pyrazinone compound which was used for synthesis of other heterocycles containing pyrrolopyrazinothinoisoquinoline moeity.
Azo-Hydrazone Tautomerism and Antimicrobial activity of New substituted Imidazolines and Perimidines
Authors: Farghaly Thoraya A , Abdallah Magda A. , Aziza Mohamed R. Abdel 
Published: May 2018

Two new series of 2-{1-[(substitutedphenyl)-hydrazono]-2-oxo-2-phenyl-ethyl}-5,5-diphenyl-3,5-dihydro-imidazol-4-one and (1H-Perimidin-2-yl)-[(substitutedphenyl)-hydrazono]-acetic acid ethyl ester were prepared by coupling the diazonium salt of aniline and its derivatives with 2-(2-oxo-2-phenyl-ethylidene)-5,5-diphenyl-imidazolidin-4-one or ethyl 3-dimethylamino-2-(1H-perimidin-2-yl)-propenoate in ethanolic sodium hydroxide solution. The structures of all the newly synthesized compounds were confirmed by spectral (IR, 1H NMR, mass) spectra , and X-ray crystallographic and elemental analyses. Also, the azo-hydrazone tautomerism of these compounds was discussed. In addition, all the newly synthesized compounds were screened for their antibacterial and antifungal activity and the results obtained indicated that some of these compounds exhibited excellent activity.
Determination of Adsorption Isotherm model best fit for methanol leaf extract of Securinega virosa as corrosion inhibitor for corrosion of mild steel in HCl
Authors: Adejo S. O. , Ekwenchi M. M. , Gbertyo J. A. , Menengea T. , Ogbodo J. O. 
Published: May 2018

The adsorption isotherm model best fit of the methanol leaf extract of Securinega virosa as corrosion inhibitor for the corrosion of mild steel in 2 M HCl medium was determined with the assistance of the Adejo-Ekwenchi adsorption isotherm. The corrosion inhibition study was carried out using the weight loss method at the temperature range of 301 K to 313 K. The inhibition efficiency, %IE, of the extract was found to increase with increase in both concentration and temperature. On the account of, R2 this adsorption process well fitted into Langmuir, Freundlich, Temkin isotherm, Flory-Huggins and Adejo-Ekwenchi models. However, through the parameter b of the Adejo-Ekwenchi isotherm, which clearly shows the adsorption process to be chemisorption, the best isotherm fit for the extract has been resolved to be the Langmuir isotherm and Temkin isotherm models.
Exocyclic enaminones as building blocks for synthesis of bioactive polyheterocyclic compounds
Authors: Abdallah Magda A. , Farghaly Thoraya A. , Aziza Mohamed R. Abdel 
Published: May 2018

The reaction of exocyclic enaminones namely, 2-(dimethylaminomethylene)-3,4-dihydro-2H-naphthalen-1-one, 3-(dimethylaminomethylene)-thiochroman-4-one and 2-(dimethyl-aminomethylene)-indane-1,3-dione, each with heterocyclic diazonium salts afforded the respective hydrazones which undergo either in situ dehydrative cyclization or cyclized by heating with acetic acid to give polycyclic compounds. The structure of all the newly synthesized products were confirmed by elemental and spectral (IR, IH NMR, Mass) data. Also, the biological activity of some of the prepared compounds was tested against some microorganisms and promising results were obtained.
Comparative study of the chemical composition and biological activities of the essential oils of Senecio gallicus from Tunisia.
Authors: Mihoubi Mohamed , Mihoubi Wafa , Gargouri Ali , Jarraya Raoudha 
Published: May 2018

The essential oils of flowers and remaining parts of the plant Senecio gallicus (Asteraceae), growing wild in Sfax (Tunisia), were obtained by hydrodistillation over a period of two years (2012 and 2013). Their analysis by Gas Chromatography-Mass Spectrometry (GC-MS), led to a total number of 36 components, belonging to different classes of chemical compounds. Oils compositions were characterized by the abundance of monoterpenes hydrocarbons, the major compounds present in flowers for the two years of study were respectively the sabinene (49.45% and 28.86%), the α-pinene (9.67% and 9.1%), and the β-myrcene (9.88% and 10.97%). These compounds were also dominant in the essential oils of the plant without flowers where they represent (65.34% and 55%) for the sabinene, (4.14% and 7.3%) for α-pinene, and (6.86% and 0%) for β-myrcene. Obtained essential oils were tested for many biological activities and showed a moderate effect against the fungus Trichoderma reesei and bacteria such as Bacillus sp and Staphylococcus aureus. This study of the Senecio gallicus essential oils represents the first one in Tunisia.
The Salts of Nitronic acid as CO2-Corrosion Inhibitors
Authors: V. M. Abbasov , L. I. Aliyeva , S. J. Haciyeva , N. I. Mursalov 
Published: May 2018

The salts of nitronic acids were obtained by nitration of higher olefins, both normal and isomeric structure in the presence of aqueous alkali. The resulting salts (Na+, K+, NH4+), were tested in CO2 -media as a corrosion inhibitor. The results showed that, the protective effect of the linear nitronated olefins increases by increasing the number of carbon atoms. This is due to the fact that because of the branched structure of the compounds, it is much more difficult to form a dense protective layer on the metal surface. 20% solutions of nitronated ethanolamine in isopropyl alcohol was synthesized and tested as corrosion inhibitor in carbon dioxide environments. The results showed that diethanolamine nitron based on a mixture of normal olefins C16-C18 at a concentration of 50 ppm has a high protective effect of 99.69%.
Synthesis, crystal structures and spectroscopic investigation of new Cu/Schiff-base complexes
Authors: Toumi Ahmed , Rzaigui Mohamed , Jannet Hichem Ben 
Published: May 2018

Three novel Copper complexes, [Cu(L1)2][CuCl2] (1), [Cu(L2)Cl] (2) and [Cu2(L3)3Cl2] (3), have been prepared by reaction of CuCl with the Schiff-base ligands L1: N,N’-bis(thiophen-2-ylmethylene)-ethane-1,2-diamine, L2: N,N’-bis(1H-pyrrol-2-ylmethylene)ethane-1,2-diamine and L3: N,N’-bis(2-nitrobenzylidene)-ethane-1,2-diamine in acetonitrile. The solid-state structures of these complexes were determined by X-ray diffraction from single crystal data and characterized by 1H and 13C NMR, IR and UV/Vis spectroscopies. This study shows that (1) is an ionic complex with a Cu(I)-centered cation and an isolated linear dichlorocuprate(I) anion, (3) is a dinuclear neutral complex of Cu(I) while (2) is a mononuclear neutral complex of Cu(II). In the three complexes, Cu is tetracordinated in different geometrical environments. The atomic arrangements and spectroscopic properties of the three complexes are reported. Complexes 1-3 exhibit, in the solid state at room temperature, photoluminescence between 320 and 550 nm.
Using 5-(4-aminoantipyrineazo)-8-hyrroxyquinoline as Complexometry Reagent with Cupper (II) and Zinc (II) Ions and its Biological Activity
Authors: A. Ali Asaad , Fahad Tarek Ali , Abdullah Wesam A. 
Published: May 2018

The complexes of azo dye 5-(4-aminoantipyrineazo)-8-hyroxyquinoline (L) with cupper (II) and zinc (II) Ions were synthesized. Characterization of these azo dyes complexes have been done on the basis of elemental analysis and IR techniques. The work involves a study of optimum conditions (time, pH, sequence of addition and temperature effects) for forming the complexes. The spectra of the complexes have been studied for a range of concentrations which Lambert – Beer's law were obeyed with sensitivity of the spectrophotometric method in terms of molar absorptivity 1.6×104 and 1.2×104 l .mol-1.cm-1 for zinc and cupper azo dyes complexes respectively .The stoichiometry of the complexes has been found to be 1:2 (metal : ligand). The overall stability constants were determined by the corresponding solutions method. The interferences effects of the foreign ions were studied. The biological activity of two complexes with two type of Bacteria (Clostridium botulinum and Escherichia Coli) were also studied.
Bis(3-phenylpropylammonium) dichromate (VI): Synthesis, crystal structure and spectroscopy studies
Authors: Trabelsi Sonia , Roisnel Thierry , Marouani Houda 
Published: May 2018

The structure of bis(3-Phenylpropylammonium) dichromate(VI) was determined from X-ray diffraction data. The compound crystallizes in the monoclinic system (space group P21/c) with the lattice parameters: a = 7.9379(2) Å, b = 36.2439(16) Å, c = 7.5753(3) Å; B = 96.069(2); V= 2167.20(14) Å3 and Z = 4. The structure was solved from 4959 independent reflections with R = 0.043 and Rw = 0.105. The structure consists of discrete dichromate anions (Cr2O72-) with eclipsed conformation stacked in layers parallel to (a, c) plane at y = 0 and ½. These anions are linked via the 3-phenylpropylammonium cations by N—H…O and C—H…O hydrogen bonds, forming a two-dimensional supramolecular network. Crystal structure and spectroscopic studies are reported for the bis(3-phenylpropylammonium) dichromate(VI).
ANTIMICROBIAL EVALUATION OF MALEIMIDE MONOMERS, HOMOPOLYMERS AND COPOLYMERS CONTAINING AZO, SULPHONAMIDE AND THIAZOLE GROUPS
Authors: Bapna Dr. Shivira , Hiran B.L. , Jain Sapna 
Published: May 2018

New maleimide Monomers, homopolymers and copolymers containing azo, sulfonamide and thiazole groups were synthesized. The structures of newly synthesized compounds have been characterized on the basis of their spectroscopic data (FT-IR and 1H-NMR). Antimicrobial studies of synthesized compounds were performed using agar well diffusion method. All the compounds showed pronounced activity against bacterial strains in comparison to activity against fungal strains.The highest antibacterial potency was exhibited by the homopolymer HPSPMI against Escherichia coli, Klebsiella pneumoniae and Bacillus subtilis. The activity of HPSPMI against later two was more pronounced than the standard drug used. Only Selected compounds showed antifungal activity. Appreciable results were found against Aspergillus fumigates but not with Candida albicans. HPSPMI showed highest activity against Aspergillus fumigates. Surprisingly after homo and copolymerization, maximum compounds exhibited not only pronounced antibacterial activity but also antifungal activity.
Spectrophotometric Determination of Certain Antiepileptic's in Tablets Using Vanillin Reagent
Authors: Mohammed Taghreed A. , Mohamed Mona A. 
Published: May 2018

A selective and new spectrophotometric method is described for determination of three antiepileptic drugs; namely lamotrigine (LAM), gabapentin (GAB), and oxcarbazepine (OXC) in drug substances and in drug products using vanillin reagent as the chromogenic agent. The method is based on a coupling reaction between the cited drugs and vanillin reagent in acidic condition. Under optimized conditions, the yellow colored products were measured at 405, 396, and 400 nm respectively. Beer’s law was obeyed at (0.4 – 10), (0.1-10), and (0.5-11) μg/mL, and the calculated molar absorptivity values are 2.52 x 104, 1.74 x 104, and 2.54 x 104 L/mol/cm for LAM, GAB, and OXC respectively. Sandell sensitivity, the limit of detection (LOD) and limit of quantification (LOQ) were calculated. No interference was observed from common additives found in drug products. The presented method was validated according to ICH guidelines. Statistical comparison of the results was performed using Student's t-test and F-ratio at 95% confidence level, and there was no significant difference between the reference and proposed method with regard to accuracy and precision. The method offers the advantages of rapidity, simplicity and sensitivity and low cost and can be easily applied to resource poor settings without the need for expensive instrumentation and reagents.
DYNAMIC LIGHT SCATTERING BY NANO- AND MICRO-SIZED COMPLEXES IN THE SYSTEM K2ReBr6/p-AMINOBENZOIC ACID/HBr/H2O
Authors: Osmanova S.N. , Kerimova U.A. , Osmanov N.S. , Ismailov E.H. , Suleymanova S.A. 
Published: May 2018

K2ReBr6/p-aminobenzoic acid/HBr/H2O system using dynamic light scattering (DLS) and electronic absorption spectra (EAS) were studied. The formation of nano- and micro-sized complexes with hydrodynamic radius 0.001-2.8 µm within the temperature interval 293-333 K and as a function of concentration of hydrobromic acid and K2ReBr6/p-aminobenzoic acid ratio are shown.
INHIBITIVE ACTION OF IMIDAZOLES FOR COPPER CORROSION IN SULFURIC ACID MEDIUM
Authors: SOUMOUE A. , JMIAI A. , IBRAHIMI B. EL , ISSAMI S. EL , Bazzi Prof. Lahcen , HILALI M. 
Published: May 2018

The corrosion inhibition of copper in the presence of 10-3 M of imidazole derivatives; Imidazole (IM), 2-Methyle imidazole (MIM), Benzimidazole (BIM) has been investigated in 1.0 M H2SO4 solution using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Relationship between molecular structure and their inhibition efficiency was elucidated by quantum chemical calculations using the density functional theory (DFT) at the B3LYP/6-31+G(d,p) level. Inhibition efficiency of these compounds which has been evaluated via experimental methods was accorded with reported theoretical ones, and following the same order as BIM ˃ MIM ˃ IM.