bluuebunny/crossref_metadata_2025 huggingface dataset:
MENGEMBANGKAN KREATIVITAS KEPEMIMPINAN SISWA DENGAN MENGANYAM BERBAHAN BARANG BEKAS DI SDN 22 DUNGINGI
Authors: Regina Anggraini Darise  , Ni Nyoman Dewi Asih  , Litami Cahyani Maida  , Rahmat Putra Lasena  , Riski Nabius  , Abdul Rahmat  , Rusmin Husain
Published: December 2022

Kepemimpinan adalah kemampuan untuk mempengaruhi orang lain dalam hal ini para bawahan  sedemikian  rupa  sehingga orang  lain  mau  melakukan  kehendak  Pemimpin meskipun  secara  pribadi  hal  ini  mungkin  tidak  disenangi. Dalam penelitian ini kami dapat mengetahui perkembangan kreativitas kepemimpinan siswa dengan menganyam berbahan barang bekas pada siswa kelas V di SDN 22 Dungingi. untuk peneliti sendiri dapat mengetahui perkembangan yang terjadi setelah menerapkan program yang telah dibuat dan mengetahui potensi kepemimpinan yang dimiliki siswa. Metode yang kami gunakan dalam proyek ini adalah metode pengamatan observasi, dengan disertai pencatatan-pencatatan terhadap keadaan atau prilaku objek sasaran, mengolah data dan membuat kesimpulan dari kegiatan yang dilaksanakan. Hasil dari proyek yang kami jalankan di SDN 22 Dungingi Kota Gorontalo adalah anyaman dari plastik bekas yang menjadi tas. Berdasarkan hasil di lapangan dengan pengamatan dan observasi menunjukkan bahwa di kelas V SDN 22 Dungingi masih ada beberapa siswa yang kurang kreatif dan kurangnya kebersamaan.
PROJECT PROGRAM SEKOLAH UNTUK PEMBUATAN CELEMEK DARI BAHAN DASAR PLASTIK UNTUK MENINGKATKAN KREATIVITAS SISWA
Authors: Ni Putu Ayu Lestari  , Siti Hadija Ngadi  , Zenab S Yantu  , Abdul Rahmat  , Rusmin Husain
Published: December 2022

Di era revolusi industri 4.0, Sudah saatnya mempertimbangkan aspek pendidikan kreativitas.karena di era ini penuh dengan tantangan dan kompetisi. Kreativitas sangat dibutuhkan/dikembangkan karena kreativitas dapat meningkatkan prestasi akdemik, kreativitas diakui sebagai faktor utama yang dapat mendayakan fungsi manusia dengan mensintesis interaksi antara kekuatan intelektif, emotif, dan motivasional. Dalam hal ini, para pendidik memegang peranan yang penting untuk mengembangkan kemampuan tersebut. Artikel ini memaparkan bagaimana upaya mengembangkan kreativitas anak, serta peran orang tua dalam mengembangkan kreativitas anak usia dini sehingga anak mempunyai bakat dan ide-ide cemerlang dan bisa menghasilkan karya karya yang bernilai seni tinggi.
En lang pind op i næsen
Authors: Laursen Helle Pia
Published: December 2022

I denne artikel sætter jeg fokus på begrebet literacy-som-begivenhed, der afspejler en søgen efter teoretiske og analytiske tilgange, der gør det muligt at forstå literacy og læring på måder, der involverer affekt, kropslighed og uforudsigelighed ved at rette opmærksomhed mod de flygtige betydningsdannelsesprocesser, der bliver til i relationer mellem mennesker, ting og tekster (Burnett & Merchant, 2020). Det gør jeg ved at genbesøge en literacyaktivitet fra sjette klasse, hvor tre 12-13 årige børn er involveret i at læse og rekonstruere en tekst om mumier (Laursen, 2016, 2019; Laursen & Kolstrup, 2018). Følger man – i et literacy-som-begivenheds-perspektiv – den affektive intensitet og kropsligheden i denne literacyaktivitet, og herunder de tre børns latter og deres leg med sproget og tekstens univers, får man øje på, hvordan børnene får skabt et sprudlende karnevalistisk univers (Bakhtin, 1984) fuld af latter og læringspotentiale. Gennem deres samarbejde og deres intense indlevelse i teksten univers skaber de en dyb forståelse af teksten, som samtidig fyldes med personlig betydning, der handler om den individuelle krops skrøbelighed og menneskelige kroppes forbundethed. På den baggrund argumenterer jeg for at se på al literacyaktivitet også som affektive møder og empirisk interessere sig for, hvordan læringsrummet sker, og hvordan læsning af tekster bliver til på ofte uforudsigelige måder.
La iguana Chopito (Cachryx defensor), endémica de la provincia biótica de la península de Yucatán
Authors: Monter-Pozos Alvaro , Hernández-Hernández Julio César , Nahuat-Cervera Pedro E. , Avilés-Novelo J. Rizieri
Published: December 2022

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Brotes de viruela del mono y su presencia en México
Authors: Dzul-Rosado Karla Rosanett , Arroyo-Solís Karla , Puerto-Manzano Fernando I. , García-Rejón Julián E.
Published: December 2022

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The Impacts of Tax Policy on Platform Markets in Digital Economy
Authors: Hao Yajie
Published: December 2022

This paper examines the effects of governmental policy in digital economy, especially the tax policy. We analyze how preferential tax policy affects the platform market and customer welfare. First, our findings demonstrate that prices have negative relation with preferential tax level in incompatible case and no relation in asymmetric compatible case. Corporation profits have positive relation with preferential tax level in asymmetric compatible case and no relation in incompatible case. Second, we derive a specific range in which preferential tax level could make it beneficial for both customers and platforms to improve compatibility. High compatibility is only good for platforms but not for customers when preferential tax level is too high. And oppositely, it’s only good for customers when preferential tax level is too low, but platforms have no incentives to support for it.
Mass Moment Determination Using Compound Pendulum
Authors: Pluta Zdzisław , Hryniewicz Tadeusz
Published: December 2022

This work has been performed to verify the existent knowledge on determination of the mass moment. For the experiment, a compound pendulum was used. The motivation to undertake these studies were experimental results indicating a big discrepancy in mass moments between the values coming from calculations using the definition formula and these obtained from the experiment. In relation to the axial moment the relative error equals 23.6%, whereas regarding the polar moment the error reached 56.4%. Considering the reason of that discrepancy we could find the existent theory not to be adequate. The theory is then considered in view of verifying first the mathematical pendulum and next the physical/compound pendulum theory. The consideration has been focused on the description of accelerated motion cycle of both pendulums as it was enough to solve the problem. A source differential equation, which serves to solve any quantum phenomena, was used in the study. Then the course of creation of detailed characteristics of the phase of mathematical pendulum accelerated motion is presented as the basis to derive formula on the mass moment of a compound pendulum. At the end this new adequate theory was verified showing the relative error to be less than one per cent.
Aqueous Solution and Computed Gas Phase Properties of Meclofenamic Acid Sodium Salt
Authors: Kharat Sanjeevan J.
Published: December 2022

Paper reports densities, ultrasonic velocities, and refractive indices of aqueous solutions of meclofenamic acid sodium salt (Na-MCF). Densities, ultrasonic velocities, and refractive indices have been measured at (298.15, 303.15, 308.15, and 313.15) K and at atmospheric pressure. Limiting molar volume and limiting molar isentropic compressibility have been calculated. DFT method has been used for computation of dipole moment, free energy, hydration free energy, and HOMO and LUMO energies of Na-MCF. Gas phase properties have been computed by the use of G09 W Software.
Structural and Vibrational Analysis of (E)-N’-(Pyridin-2-yl)Methylene)Nicotinohydrazide Using Quantum Chemical Calculation
Authors: Nathiya A. , Saleem H. , Bharanidharan S. , Suresh M. , Padusha M. Syed Ali
Published: December 2022

FT-IR, FT-Raman and UV-Vis spectra of the Schiff base compound (E)-N’-(Pyridin-2-yl) methylene) nicotinohydrazide (P2CNH) have been recorded and analyzed. The optimized molecular structures, vibrational assignment of P2CNH have been investigated by using DFT/B3LYP/6-311++G(d,p) level of theory. The Non-linear optical behavior of the title compound was measured using first order hyperpolarizability calculation. Hyperconjugative interaction and electron densities of donor (i) and acceptor (j) bonds were calculated using NBO analysis. The energy gap of the molecule was found using HOMO and LUMO calculation. The electronic transition was studied using TD-DFT method. In addition of mulliken atomic charges and MEP surface have been also analyzed.
Study of the Properties of the Porous Silicon Synthesized by Ag Assisted Chemical Etching
Authors: Karanam Madhavi , Mohan Rao G. , Habibuddin Shaik , Padmasuvarna R.
Published: December 2022

Porous Silicon (PSi) is synthesized by Ag assisted electroless etching and characterized by Scanning electron microscopy (SEM). The effect of etching time on the optical reflectivity, optical absorbance of PSi is investigated. Reflectivity measurements showed that 45% reflectivity Si wafers drops from 45% to 10% for 2 hours etching and 6% for 3 hours etching. The decrease in the reflectivity shows that the PSi can be employed as an anti reflecting substrate in optoelectronic devices. The absorbance measurements reveal that the average absorbance of PSi is 0.60 in the wavelength range 300-800 nm after 2 hours etching. From the photoluminescence spectra it was found that PL intensity of PSi is high compared to bare silicon wafer. Static water contact angle measurements were performed to examine the hydrophobic properties of the PSi prepared under different conditions.
An Investigation on Effect of Depth of Cut, Feed Rate and Tool Nose Radius on Induced Vibration and Surface Roughness during Hard Turning of 41Cr4 Alloy Steel Using Response Surface Methodology
Authors: Izelu Christopher Okechukwu , Eze Samuel Chike
Published: December 2022

This paper describes an aspect of a set of turning experiments performed in attempt to model, predict and optimize the machining induced vibration and surface roughness as functions of the machining, tool and work-piece variables during hard turning of 41Cr4 alloy special steel, with standard cutting tool, on a conventional lathe. Amongst others, the input variables of interest include the depth of cut, feed rate and tool nose radius. The response surface methodology, based on central composite design of experiment, was adopted, with analysis performed in Design Expert 9 software environment. Quadratic regression models were suggested, and proved significant by an analysis of variance, for the machining induced vibration of the cutting tool and surface roughness of the work-piece. They also have capability of being used for prediction within limits. Analysis of variance also showed the depth of cut, feed rate and tool nose radius have significant effect on the machining induced vibration and surface roughness. Whereas the depth of cut has dominant effect on the machining induced vibration, the tool nose radius has dominant effect on the surface roughness. The optimum setting of the depth of cut of 1.33095 mm, feed rate of 0.168695 mm/rev, and the tool nose radius of 1.71718 mm is required to minimize the machining induced vibration at 0.08 mm/s2 and surface roughness at 6.056 μmm with a desirability of 0.830.
Synthesis, Characterization and Biological Evaluation of 3'-Benzoyl-5'-(Furan-2-yl)-4'-Phenylspiro[Indoline-3,2'-Pyrrolidin]-2-One Derivatives and its Molecular Docking Studies
Authors: Rajaraman D. , Doss M. Arockia , Krishnasamy K.
Published: December 2022

A series of new spirooxindole derivatives were synthesized via 1,3 –dipolar cycloaddition. All the synthesized compounds were evaluated for antimicrobial activity. In antibacterial studies compound 4d demonstrated the most potent inhibitory activity (MIC = 12.5 lg/mL for K.pneumonia, B.cereus and S.typhi), which was compared with the positive control streptomycin. In antifungal studies compound 4e demonstrated the most potent inhibitory activity (MIC = 3.125 lg/mL for C.albicans and A.niger), which was related with the standard drug ketaconazole. In addition, molecular modeling studies were also performed to disclose the binding modes of the most active inhibitors to the amino acid residues that compose the active site of the glucosamine-6-phosphate synthase and crystal structure of human lanosterol 14-alpha dimethylase in complex with ketaconazole enzyme.
Activity of Total Alkaline Phosphatase in Water of the Barlinek Lake
Authors: Daniszewski Piotr
Published: December 2022

To estimate differentiation of activity of total alkaline phosphatase in water of the Barlinek lake, in time April - October of 2008. Studies upon water revealed that, among the zones analyzed, upper sublittoral layer was characterized by the highest phosphatase activity. From the analysis of seasonal oscillations it follows that activity maximum for alkaline phosphatase, both in water, occurred in spring (May) and summer (July).
Study of Acoustical Parameters in Binary Liquid Mixture Containing 1-Butanol and Hexane at Temperatures 313.15 K, 318.15 K and 323.15 K
Authors: Srinivasu C.H. , Anil Kumar K. , Fakruddin S.K. , Narendra K. , Anjaneyulu T.
Published: December 2022

The values of ultrasonic velocity (u), density (ρ), and viscosity (η) have been measured experimentally in the binary liquid mixture containing 1-butanol and hexane over the entire range of composition at different temperatures 313.15 K, 318.15 K and 323.15 K. This experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (β), free length (Lf), molar volume (Vm) and acoustic impedance(z). The results have been qualitatively used to explain the molecular interactions between the components of the liquid mixture.
Synthesis, Spectral Studies Antibacterial and Antifungal Activity of 2"-Amino-4"-[2 -(4'-Chlorophenyl)-6-Methyl Imidazo[1, 2-a]Pyridin-3-yl]-6"-Aryl Nicotinonitrile
Authors: Bhuva V.V. , Bhadani V.N. , Purohit H.D. , Purohit Dipak M.
Published: December 2022

Pyridine nucleus plays an important role in medicine, agriculture and industrial chemistry. With a view of biological activities and variety of industrial applications, some new 2" – amino - 4" - [2 - (4' -chlorophenyl)-6-methyl imidazo [1, 2-a] pyridin-3-yl]-6"-aryl nicotinonitriles ( 4a-4l ) have been synthesized. The products have been assayed for their biological activity against Gram +ve, Gram –ve bacteria and fungi. Some of the products showed moderate activity in concentration 50μg/ml. The structures of the products have been elucidated by IR, 1H-NMR, Mass spectral data, elemental analysis and thin layer chromatography.
Synthesis of New Chiral Inducer and Preparation of Semi-Conducting Polymer Films Showing Fingerprint Structure
Authors: Hayashi Hiroki , Kawabata Kohsuke , Goto Hiromasa
Published: December 2022

We synthesised a rod like shaped new chiral inducer to construct chiral liquid crystal electrolyte solution. Next, electrochemical polymerisation was carried out in the chiral liquid crystal electrolyte solution. The surface morphology of the polymers were observed with polarising optical microscopy. Synthesis of the new chiral inducer and preparation of semi-conducting thin film in the cholesteric liquid crystal electrolyte solution were performed.
A Developed Version of the Hooke’s Law
Authors: Pluta Zdzisław , Hryniewicz Tadeusz
Published: December 2022

The paper contains a proper approach to the Hooke’s law as well as its developed version. A system approach was applied covering all the process of material elongation. An adequate interpretation of this law is given indicating that it touches only changes of magnitudes which describe the considered reality. The plot of elongation curve has been presented by separating a series of proper zones connected with the phenomena occurring in this process. A developed version of the Hooke’s law, taking into account the considered reality concerning the material stress both its own as well as caused by external loading, is the conclusion of these considerations.
Optical Study on Deposed Polystyrene Doped DCM Laser Dye Thin Films at Different Temperature
Authors: Tuhaiwer Akeel Shaker
Published: December 2022

Polystyrene (PS) polymer doped with DCM laser dye thin films have prepared on glass substrate using casting method. The obtained PS doped with DCM thin films were treated at different annealing temperatures such (30, 40, 50, 60, 70) °C. It was observed from result that the allowed direct electronic transitions energy gap was increased from 2.21 up to 2.3e.V as the temperature increasing from 30-70°C. And the allowed indirect electronic transition energy gap rose from 0.06 to 0.15e.V as the temperature increasing. The allowed indirect phonon energy also was decreased at the same range of temperature. The different effect of temperature variation was observed on the optical properties of PS doped with DCM thin films.
Portfolio Optimization Using Conditional Sharpe Ratio
Authors: Baweja Meena , Saxena Ratnesh R. , Sehgal Deepak
Published: December 2022

In this paper we propose a portfolio optimization model that selects the portfolio with the largest worse-case-scenario sharpe ratio with a given confidence level. We highlight the relationship between conditional value-atrisk based sharpe ratio and standard deviation based sharpe ratio proposed in literature. By utilizing the results of Rockafellar and Uryasev [5], we evaluate conditional value- at- risk for each portfolio. Our model is expected to enlarge the application area of practical investment problems for which the original sharpe ratio is not suitable, however should device effective computational methods to solve optimal portfolio selection problems with large number of investment opportunities. Here conditional sharpe ratio is defined as the ratio of expected excess return to the expected shortfall. This optimization considers both risk and return, of which changes will effect the sharpe ratio. That is the fitness function for dynamic portfolio is the objective function of the model.
Fundamental and Second Harmonic Bands of Solar Radio Burst Type II Caused by X1.8 - Class Solar Flares
Authors: Hamidi Zety Sharizat , Shariff N.N.M. , Monstein C.
Published: December 2022

An extreme 2012 October 23 solar flare event marked on the onset of the CALLISTO data, being one of the highest solar flare event that successfully detected. The formation of harmonic solar burst type II in meter region and their associated with X1.8-class solar flares has been reported. This burst has been observed at the National Space Centre, Banting, detected by the Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory (CALLISTO) system in the range of 150-400 MHz in the low frequency band. It occurred between 3.17:45 UT to 3.19:00 UT within 1 minute 15 seconds. The Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory CALLISTO spectrometer is a solar dedicated spectrometer system that has been installed all over the world to monitor the Sun activity in 24 hours. The growth of this burst is often accompanied by abundance enhancement of particles which may take the form of multiple independent drifting bands or other forms of fine structure. Due to the results, the drift rate of this burst is 2.116 MHz s–1, which is considered as a slow drift rate. These drifting bands are approximately having a frequency ratio 2:1. This burst is a particular interest, though of sporadic and infrequent occurrence. The splitting is due to the effect of magnetic splitting, analogous to the Zeeman Effect. This is one of the examples which the type II burst is not always associated with CMEs event. The combination of radio and x-ray region give a complete view of the solar flare eruption from e active region AR1598. Both different electromagnetic spectrum shows the exact time. Other interesting results is that this type II burst is not associated with CMEs as usual, but due to the very high solar flare event with a fundamental form at more than 100 MHz. An extension of the present work will be a detailed study of the possible triggering and the driving mechanism of solar flare explosion.
Variable Viscosity of Water as the Controlling Factor in Energetic Quantities that Control Living Systems: Physicochemical and Astronomical Interactions
Authors: Karbowski Lukasz M. , Persinger Michael A.
Published: December 2022

The emergence of energy from the product of viscosity, volume and intrinsic or extrinsic frequency indicates that the ten fold difference in this property displayed by water could define the boundary of the physicochemical conditions of living systems. Intra-aqueous energy induced by geomagnetic variations and experimental time-varying magnetic fields within specific volumes of water maintained in static, dark conditions can be manifested as photon emissions with shifts in spectral power that approximate the width of the plasma cell membrane. Various manipulations of the viscosity of water accurately predicted the frequency required to affect intracellular organelles such as vesicles as well as the intramolecular pressures that affect interactions with photons. Application of the Smoluschowski-Einstein relation to the proton, the mediator of pH and the dynamics of the hydronium ion, potentially explained the vector characteristics of the frequency band of extremely low frequency magnetic fields that slow malignant cells. The derivation of viscosity from the inverse of the Newtonian Gravitational Constant, diffusivity and the square of the applied frequency indicates that resonant oscillations between the solid earth and the atmosphere and unit variations in solar flux density may be relevant variables.
Synthesis and Characterization of Cu(II), Ni(II) and Co(II) Based Schiff Base Complexes
Authors: Bhalu Ankita A. , Vilapara Kalpesh , Maru Minaxi , Shah Manish
Published: December 2022

N-(3-Bromo-4-hydroxy-5-methoxybenzylidene)-4-Bromobenzenamine was synthesized. This was further used to synthesize Co(II), Ni(II) and Co(II) based metal complexes and characterized by FT-IR, Elemental analysis, ESI Mass and UV spectroscopy.
Insect Antifeedant Potent Halogen Substituted Phenyl Chalcones
Authors: Sundararajan R. , Arulkumaran R. , Vijayakumar S. , Kamalakkannan D. , Suresh R. , John Joseph S. , Ranganathan K. , Sakthinathan S.P. , Vanangamudi Ganesan , Thirunarayanan Ganesamoorthy
Published: December 2022

Some 2′,3′,4′-trichlorophenyl chalcones [(E)-1-(2,3,4-trichlorophenyl)-3-(substituted phenyl)-2-propen-1-ones] have been synthesised using sulfated Titaniacatalyzed solvent-free aldol condensation between 2,3,4-trichloroacetophenone and substituted benzaldehydes. The purities of synthesised chalcones were checked by their analytical, physical and spectroscopic data reported in literature. The insect antifeedant activities of these chalcones have been studied using 4th instar larvae Achoea Janata L by castor leaf disc bio-assay method. The chloro substituted chalcones shows significant insect antifeedant activity.
Spectral Correlation Analysis and Antimicrobial Activities of some 2,4-Dimethoxy Phenyl Chalcones
Authors: John Joseph S. , Arulkumaran R. , Kamalakkannan D. , Sakthinathan S.P. , Sundararajan R. , Suresh R. , Vijayakumar S. , Ranganathan K. , Kalyanasundaram N. , Vanangamudi Ganesan , Thirunarayanan Ganesamoorthy
Published: December 2022

A series of 2,4-dimethoxy phenyl chalcones have been synthesized by Crossed-Aldol condensation of 2,4-dimethoxy phenyl and various substituted benzaldehydes. The purities of these chalcones have been checked by their physical constants, UV, IR, NMR and MASS spectral data. The spectral data of these chalcones have been correlated with Hammett sigma constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effects of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.
Synthesis, Spectral Studies and Biological Screening of 2-(4'-Chlorophenyl)-6-Methyl-(3-N, N’-Diaryl/Dialkyl Amino Methyl)-Imidazo[1,2-a]Pyridine
Authors: Bhuva V.V. , Bhadani V.N. , Purohit H.D. , Purohit Dipak M.
Published: December 2022

2-(4'-chlorophenyl)-6-methyl- (3-N, N'- diaryl/dialkyl amino methyl)-imidazo [1, 2-a] pyridine (4a-4l) has been synthesized. The products have been assayed for their biological activity against Gram +ve, Gram –ve bacteria and fungi. Some of the products showed moderate activity in concentration 50μg/ml. The structures of the products have been elucidated by IR, 1H-NMR, Mass spectral data, elemental analysis and thin layer chromatography.
Synthesis and Antimicrobial Activity of [2"-Aryl(Quinoxaline)-3-yl]-(Methylene Phenyl Amino)-6-[Bis-(2"'-Chloro Ethyl) Amino]-4-Methoxy-1,3,5-Triazine
Authors: Kathiriya P.J. , Purohit H.D. , Purohit Dipak M.
Published: December 2022

The compounds 5d, 5e, 5g, 5i showed moderate antimicrobial activity then other synthesized compounds, compare with known standard drugs.
Mechanical Characteristics of Aluminium Powder Filled Glass Epoxy Composites
Authors: Sarkar Pujan , Modak Nipu , Sahoo Prasanta
Published: December 2022

Mechanical characteristics of glass epoxy and aluminium powder filled glass epoxy composites are experimentally investigated using INSTRON 8801 testing device as per ASTM standards. With a fixed wt% of fiber reinforcement, glass epoxy and 5-15 wt% aluminium powder filled glass epoxy composites are fabricated in conventional hand lay-up technique followed by light compression moulding process. Experimental results show that aluminium powder as a filler material influences the mechanical properties. Density and void fraction in composites increase whereas steady decrease of tensile strength is recorded with aluminium powder addition. Micro hardness, flexural strength, inter laminar shear strength (ILSS) of 5 and 10 wt% aluminium content composites are improved compared to unfilled glass epoxy composite and with further addition of aluminium up to 15 wt% decreasing trends are observed. Glass epoxy with 5 wt% aluminium concentration shows the highest improvement. Tensile modulus for aluminium addition of 5 wt% decreases whereas 10 wt% aluminium filled composite shows improvement in tensile modulus. These are explained on the basis of material properties, void fractions and bonding strength among the constituents.
Synthesis of N'-(7-Chloroquinolin-4-yl)-6-Methyl-2-Oxo-4-Phenyl-1,2,3,4-Tetrahydropyrimidine-5-Carbohydrazide Derivatives as Potent Antibacterial Agents
Authors: Bhoi Manoj N. , Borad Mayuri A. , Pithawala Edwin A. , Modi Shweta , Patel Hitesh D.
Published: December 2022

Some novel N'-(7-chloroquinolin-4-yl)-6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carbohydrazide derivatives were synthesized via three step reactions by convectional method. The structures of all the compounds have been confirmed by FT-IR, NMR, and MASS and by elemental analysis. We have been evaluated it inhibition capacity for various gram positive and gram negative bacterial strain. All compounds were found to be good to excellent active against all four bacterial strains.
A Novel Use of 3-Methyl-2-Benzothiazolinone Hydrazone Hydrochloride Monohydrate for Kinetic Spectrophotometric Determination of Captopril in Pharmaceutical Formulations
Authors: Khateeb Mouhammed , Elias Bashir , Adi Shahama
Published: December 2022

A new, simple and sensitive kinetic spectrophotometric method has been proposed for the determination of captopril (CPT) in pharmaceutical formulations. The method is based on oxidation of 3-methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate (MBTH) by ferric chloride followed by its coupling with the drug to form green-yellow colored product with absorbance maximum at 395nm. The concentration of CPT was calculated using the calibration equation for the rate data and fixed time methods. The linearity range was found to be 0.5–22.5 μg mL-1 for each method. The correlation coefficients were 0.9994 and 0.9971 for rate data and fixed time methods respectively. The proposed methods were applied successfully for the determination of CPT in pharmaceutical formulations. Statistical comparison of the results shows that there is no significant difference between the proposed and official methods.
Study of Thermotropic Mesomorphismin Nonlinear and Linear Isomeric and Nonisomeric Series
Authors: Jain B.B. , Patel R.B.
Published: December 2022

Chalconyl homologous series: RO-C6H4-COO-C6H4(m)-CO-CH=CH-OC14H29(n) para has been synthesized and studied with a view to establish the relation between the molecular structure and thermotropic Liquid crystalline (LC) properties. Novel nonlinear series consists of thirteen members (C1 to C18) of a series. C6 to C18 members are enantiotropically nematogenic and the rest of the homologues ( C1 to C5 ) are nonliquid crystals (NLC). Smectogenic character is totally absent. Transition temperatures and the textures of the novel homologues were determined by an optical polarizing microscopy (POM) equipped with a heating stage. Textures of a nematic phase are threaded or schlieren. Transition curves Cr-N/I and N-I behaved in normal manner. N-I transition curve exhibited odd-even effect. Analytical and spectral data confirmed the molecular structures of homologues. Thermal stability is 107.0 and mesomorphic nematogenic degree of mesomorphism vary minimum to maximum are 17.0°C to 35.0°C at the C14 and C8 homologues respectively. Some mesogenic properties of presently investigated homologous series are compared with structurally similar isomeric and nonisomeric homologous series, and their group efficiency order derived. Thus, present novel series is nematogenic with absence of smectogenic character whose nematogenic transition temperatures vary from 74.0°C to 117.0°C.
Kinetic Study on the Heavy Metal Ions Removal from Aqueous Solutions Using Multi-Walled Carbon Nanotubes
Authors: Chen Jun Jie , Liu Bao Fang
Published: December 2022

Kinetic study on the removal of zinc(II), copper(II), lead(II) and cadmium(II) from the aqueous solutions using multi-walled carbon nanotubes (MWNTs) was carried out to examine the temperature effect on the adsorption of zinc(II), copper(II), lead(II) and cadmium(II) as well as to explore the potentiality of using carbon nanotubes as a promising adsorbent for environmental remediation. Multi-walled carbon nanotubes were characterized by BET (Brunauer-Emmett-Teller), FE-SEM (Field emission scanning electron microscopy), and DPASV (differential pulse anodic stripping voltammetry). Adsorption experiments were carried out and comparisons with the previous work were made. Experimental results showed that the multi-walled carbon nanotubes can successfully remove zinc(II), copper(II), lead(II) and cadmium(II) from aqueous solutions. Increasing solution temperature can significantly improve the removal efficiency because of the endothermic nature of adsorption process. The kinetics of zinc(II), copper(II), lead(II) and cadmium(II) adsorption on multi-walled carbon nanotubes were analyzed, and the calculation results showed that the heavy metal ions adsorption is a pseudo-second-order process, and its capacity increases with increasing solution temperature. The binding of the metal ions by the multi-walled carbon nanotubes was evaluated from the adsorption capacities and found in the following order: copper(II) > lead(II) > zinc(II) > cadmium(II). Finally, multi-walled carbon nanotubes demonstrated that they are a promising adsorbent for the removal of heavy metal ions from aqueous solutions.
Fire-Resisting Composites Based on Polymer Matrix
Authors: Ushkov V.A. , Figovsky O.L.
Published: December 2022

In the present work we have studied the thermal stability, flammability, fume evolution of epoxy matrix composites with different types and amounts of hardeners, fillers, plasticizers and fire retardants. It is shown that chemical composition of fillers has little effect on the flammability of epoxy composites when the content of mineral fillers is less than 45% by mass. Smoke formation decreases linearly with increasing the degree of filling. It is shown that to obtain low-combustible materials the oxygen index should exceed 31%. It was found that the optimal concentration of industrial brominated fire retardants is 8-10% by mass. To reduce the flammability of epoxy composites, additive brominated fire retardants in the form of a solution in N,N-dimethyl-2,4,6-tribromoaniline have been proposed. The high efficiency of acetyl-and α-hydroxyethyl ferrocene as a smoke suppressor of epoxy composites is shown.
Heavy Metals in Sediment Ecosystem of Bhavan’s College Lake of Andheri, Mumbai
Authors: Singare P.U. , Talpade M.S. , Dagli D.V. , Bhawe V.G.
Published: December 2022

The present study was initiated to understand the accumulation of toxic heavy metals in sediments of Bhavan’s College Lake of Andheri, Mumbai. The study was performed for a period of one year starting from June 2011 to May 2012 to quantify the toxic heavy metals like Cu, Pb, Cr, Ni, Fe, Hg, As and Cd by atomic absorption spectroscopy technique coupled with cold vapour technique (for Hg analysis) and hydride generation technique(for As analysis). It was observed that the yearly average concentrations of these heavy metals in lake sediments were 0.53, 0.25, 0.42, 0.43, 4.6, 0.14, 0.12 and 0.11 ppm respectively which were above the WHO limits for aquatic life and CPCB limits for inland surface water. These heavy metals accumulated in lake sediments may enter the water thereby creating threat to aquatic life. They may enter the food chain through biomagnifications and may create adverse effect on human health. It is expected that in addition to the water analysis which is practiced for years, sediment analysis performed in the present investigation will help in evaluating quality of the total ecosystem of the lake. It will also provide environmentally significant information about natural and anthropogenic influence on the water body.
Chemically Modified Polymethyl Methacrylate in a Magnesium-Polymer Cell
Authors: Sienicki W. , Wojtewicz M.
Published: December 2022

As a result of the electrophilic protonation of a carboxyl group of dielectric polymethylmethacrylate (PMMA) with trifluoromethanesulfonic acid (CF3SO3H), a modified conducting polymer material was produced in the shape of a thin elastic lamina and a dense conductive gel, whose density was 1.26 g/cm3. These polymers conduct electricity, do not dissolve in either cold or warm water and are also resistant to weather conditions. Their conductivity in room temperature is 7.5·10-3 Scm-1 and it greatly increases above 154 K. Activation energy Ea decreases with increasing temperature in the range 154 K – 300 K from 1.47 eV to 0.69 eV. The magnesium-polymer (Mg-Poly) cell is constructed with magnesium as the anode and conductive PMMA as the cathode and both electrodes are electrically connected with a polymer gel electrolyte. The rated voltage of this cell is 2.4 V.
Effect of Annealing on the Optical Properties of (PVA-CuCl) Composites
Authors: Salman Sabah A. , Bakr Nabeel A. , Jwameer Marwa R.
Published: December 2022

Films of polymer (polyvinyl alcohol (PVA)) doped with CuCl salt at different concentrations (2 and 10) wt% were prepared using casting technique. The optical properties of the films were studied after annealing. The transmission and absorption spectra have been recorded in the wavelength range of (300-1100) nm. The effect of annealing on the optical properties for (PVA-CuCl) films with different concentrations (2 and 10) wt% of copper chloride salt shows that the transmittance decreased after annealing for all the films. The optical constants (absorption coefficient, refractive index, extinction coefficient, real and imaginary parts of dielectric constant) for all the films are affected by annealing. The energy gap (Eg) of all the films decreased after annealing.
Morphological and Structural Properties of Porous Silicon (PSi)
Authors: Kadhim Ayad Jumaah , Alzubaidy Muneer H. Jaduaa , Abd Ahmed N.
Published: December 2022

This study includes the effect of the etching time on the morphology of the surfaces produced using the electrochemical method of silicon ( p-type), where it was found that the etching leads to increase the porosity layer of silicon. The production of nanocrystalline structures and control of their production conditions is the first step to control the properties of the devices. These are very important applications for the etching of renewable energy.
Progress in Elaboration of Nonisocyanate Polyurethanes Based on Cyclic Carbonates
Authors: Figovsky Oleg L. , Shapovalov L. , Leykin A. , Birukova O. , Potashnikova R.
Published: December 2022

In the article is given a review on synthesis and application nonisocyanate polyurethanes based on cyclic carbonate oligomers. Nonisocyanate polyurethane (NIPU) networks are obtained by reaction between the polycyclic carbonate oligomers and aliphatic or cycloaliphatic polyamines with primary amino groups. This forms a crosslinked polymer with β-hydroxyurethane groups of different structure – polyhydroxyurethane polymer. One of the most interesting derivatives of unsaturated fatty compounds is epoxidized triglyceride oils (ETO), particulary epoxidized soybean oil (ESBO). Until now, ESBO is primarily used as plasticizers for polyvinyl chloride, chlorinated rubber and polyvinyl emulsions to improve their stability and flexibility. Also there are numerous useful derivatives of ETO. Among the various materials, products of reactions of ETO and carbon dioxide (CO2) deserve special attention. A basic composition and a technique for mixing and foaming were developed for insulating foam applied by spraying, the material being based on the use of the synthetic raw materials. UV-curable concrete floor coatings provide a durable, high-performance and eco-friendly solution. These thin-film coating systems cure instantly, thereby minimizing the downtime of any facility. Other benefits of these coatings include excellent chemical resistance, easy cleanability, little odor, and the ability to coat in cold conditions; Fig. 3, Tabl. 3, Ref. 39.
Connective Eccentric Index of Circumcoronene Homologous Series of Benzenoid Hk
Authors: Farahani Mohammad Reza
Published: December 2022

Let G be a molecular graph, a topological index is a numeric quantity related to G which is invariant under graph automorphisms. The eccentric connectivity index ξ(G) is defined as ξ(G) = ∑vV(G) d x ε(v) where dv, ε(v) denote the degree of vertex v in G and the largest distance between vand any other vertex u of G. The connective eccentric index of graph G is defined as Cξ(G) = ∑vV(G) dv /ε(v) In the present paper we compute the connective eccentric index of CircumcoroneneHomologous Series of Benzenoid Hk (k ≥ 1).
Synthesis, Spectral Studies, Antibacterial and Antifungal Activity of 2"-Methoxy-4"-[2 -(4'-Chlorophenyl)-6-Methyl Imidazo[1, 2-a]Pyridin-3-yl]-6"-Aryl Nicotinonitrile
Authors: Bhuva V.V. , Bhadani V.N. , Purohit H.D. , Purohit Dipak M.
Published: December 2022

Pyridine nucleus plays an important role in medicine, agriculture and industrial chemistry. With a view of biological activities and variety of industrial applications, some new 2" – methoxy - 4" - [2 - ( 4' -chlorophenyl)-6-methyl imidazo [1, 2-a] pyridin-3-yl]-6"-aryl nicotinonitrile( 4a-4l ) has been synthesized. The products have been assayed for their biological activity against Gram +ve, Gram –ve bacteria and fungi. Some of the products showed moderate activity in concentration 50µg/ml. The structures of the products have been elucidated by IR, 1H-NMR, Mass spectral data, elemental analysis and thin layer chromatography.
Strength of Normal Sections of Double-Ply Rubcon-Concrete Flexural Structures Using as a Binder of Polybutadiene Oligomers
Authors: Figovsky Oleg , Potapov Yury , Polikutin Alexey
Published: December 2022

This paper presents the research of the strength of normal sections of rubcon-concrete flexural members with different locations and ratios of the plies to reveal the effect of combing such materials in structures.
Evaluation of Environmental Impact of Cement Production in Algeria Using Life Cycle Assessment
Authors: Boughrara S. , Chedri M. , Louhab K.
Published: December 2022

The aim of this study is the use of Life Cycle Assessment, to evaluate the impact generated by cement manufactory situated in Sour EL Ghozlane town in Algeria country, which use the dry process to produce cement Portland. The LCA method is used for compiling and examining the inputs and outputs of energy, raw material and environmental impacts directly attributable to the manufacture and functioning of a product throughout its life. It is also used to determine element and energy contributing to each impact evaluated. Potentials impacts are evaluated using the SimaProV.7.1 software and IMPACT2000+ method in this study.
Effects of Laser Pulse Energy and Annealing Process on Physical Properties of Nanostructured SiO2 Prepared by Pulse Laser Deposition
Authors: Odah Jafer Fahdel
Published: December 2022

Silicon dioxide thin film of different thicknesses has been grown on glass substrate by pulsed laser deposition technique with and without annealing temperature under the vacuum pressure of 8×10-2 mbar. The optical properties such as the absorption, and transmission spectra have been studied for the prepared SiO2 thin film before and after annealing temperature. From the transmission spectra, the optical gap and linear refractive index of the SiO2 thin film was determined. The structure of the SiO2 thin film was tested with X-Ray diffraction, it was formed to be amorphous structure before annealing temperature. The effects of laser pulse energy on the optical properties has been studied before and after annealing temperature. It is found that almost optical properties depends on the laser pulse energy and increases with increasing laser pulse energy and they are enhanced with the annealing temperature. Keywords: SiO2 thin film, pulse laser deposition, annealing temperature.
Copolymerizable Photoinitiators Based on Benzophenones and their Influence on Shrinkage of Photoreactive Acrylic PSAs
Authors: Czech Zbigniew , Kowalczyk Agnieszka , Sowa Dominika , Kowalska Jagoda , Ragańska Paulina
Published: December 2022

This manuscript describes a novel class of copolymerizable benzophenone photoinitiators and their influence on viscosity and molecular mass of acrylic pressure-sensitive adhesives (PSAs) during radical solvent polymerization and shrinkage of acrylic PSAs coated on PVC film and crosslinked using UV radiation.
Physical, Mechanical and Thermal Properties of Sand Reinforced Polyester Resin Composite
Authors: Islam Md Mahfujul , Kabir Md Alamgir , Kabir Humayun , Ahmed Farid , Gafur Md Abdul
Published: December 2022

Sand reinforced polyester composite have been prepared by compression molding method with a variety of range (0,15,30,45 60%) sand respect to the unsaturated polyester resin. various parameter like mechanical, Physical and thermal properties of sand reinforced, polyester resin composite have been determined by various technique like water compressive strength ,flexural strength , hardness and thermal analysis. Physical properties like density and water intake increases with the addition of sand ,compressive strength increases but flexure strength decreases with the amount of sand, on hardness test, Vickers hardness increases but on leeb rebound it decreases with amount of sand, and finally thermal conductivity decreases with the addition of sand.
Atrazine and Metolachlor Contamination in Surface and Ground Water in the Zomba/Bvumbwe Region in Malawi
Authors: Lakudzala Deliwe Dinah
Published: December 2022

A snapshot survey was conducted to assess ground and surface water contamination by atrazine and metolachlor in the Zomba/Bvumbwe region. Ground and surface water samples were collected and their atrazine and metolachlor were extracted using ethyl acetate. The extracts were cleaned up using florisil, concentrated on a rotary evaporator and detected using thin layer chromatography. No herbicide residue was detected in the groundwater samples. In surface water samples atrazine was detected in 38 % and metolachlor was detected in 15 % of the samples. The concentrations of the herbicides were at their highest soon after the first run off event after herbicide application. The concentrations, however were generally below the World Health Organization's (WHO's) recommended maximum guideline values (2 μg/ml atrazine and 10 μg/ml) metolachlor. Following the first run off event concentrations of herbicides steadily decreased with time, decreasing to zero within eight weeks of herbicide application at 37 % of the water sampling points that had herbicide contamination. Light soaking rains, higher clay content, flat land, longer distance between agricultural land and surface water body (filtering area), lower herbicide application rates and herbicide incorporation seemed to reduce herbicide export to surface water. Based on the study it is recommended that regular monitoring of pesticides in water should be done and that quantification of the pesticides should be done more accurately using a gas or liquid chromatograph with appropriate detectors. It is also recommended to follow good land husbandry practices to reduce export of pesticides to surface water bodies.
Synthesis of Furfural from Bagasse
Authors: Gebre Hayelom , Fisha Kiros , Kindeya Tsegalaul , Gebremichal Tsigehiwot
Published: December 2022

Bagasse is a waste product from the sugar industry, which is usually used as energy source in factory at present. However, the amount of bagasse left is still high enough for more value-added product for example furfural. Bagasse is a good source of pentosan and containing about 25 to 27%. The main objective of the research was to produce furfural from bagasse. The main raw material for the production furfural was bagasse and some chemicals/ingredients were used (H2SO4, water, NaCl). Furfural is an important organic chemical, produced from agro industrial wastes and residues containing carbohydrates known as Pentosans. It is a basic chemical, which can be utilized in a variety of industries such as chemical industry, refining oil industry, food industry and agricultural industry. In its pure state, it is a colourless or yellow oily liquid with the odour of almonds, but upon exposure to air it quickly becomes yellow then brown and finally black, it is commonly known as furfuraldehyde.
Malononitrile: A Versatile Active Methylene Group
Authors: Dhivare Ravindra S. , Rajput S.S.
Published: December 2022

The title role of malononitrile in the development of Knoevenagel condensation of organic synthesis and their new findings are explored in this review. The active methylene group of malononitriles is very important attacking part in the heterocyclic conversions and also having a great potency towards several microbial and biological systems.
Acoustical Studies of some Chalcones in DMF and DMSO Solutions
Authors: Baluja Shipra , Kasundra Pravin
Published: December 2022

This work reports densities, speeds of sound, and isentropic compressibility of the solutions of some synthesized chalcones in N,N-dimethylformamide and dimethyl sulphoxide solutions of various concentrations at 308.15 K with a view to understand molecular interactions in these solutions.