bluuebunny/crossref_metadata_2025 huggingface dataset:
Frequency Tunable Non-Reciprocal Bandpass Filter and Diplexer Using Time-Modulated Microstrip λg/2 Resonators
Authors: Wu Xiaohu , Nafe Mahmoud , Alvarez Melcon Alejandro , Gomez-Diaz Juan Sebastian , Liu Xiaoguang
Published: March 2020

This paper presents novel designs of frequency reconfigurable distributed non-reciprocal bandpass filter and diplexer based on spatio-temporally modulated microstrip λg/2 resonators. The modulation is achieved by loading both ends of the λg/2 transmission line resonators with time-modulated capacitors. To provide an inherent biasing isolation between the RF and the modulation signals, the modulation voltage source is connected at the center of the resonator, where there is a natural voltage null. A single inductor is used to further enhance such biasing isolation. The wideband nature of this isolation scheme enables the tuning of the devices over a wide frequency range. With more than 30-dB RF to modulation isolation, the proposed resonator structure also enables low insertion loss by eliminating RF signal leakage to the modulation ports. Two examples of a 3-pole bandpass filter and a diplexer are demonstrated with good agreement between the measurement and the simulation. The fabricated filter shows a minimal insertion loss of 3.9 dB, a 20-dB isolation bandwidth of 42 MHz at 1.0 GHz, and frequency tuning range of 885-1031 MHz. The measured diplexer has two non-reciprocal bandpass channels at 829 MHz and 997 MHz, respectively. The two channels can be independently reconfigured without affecting each other.
Pengaruh Pemahaman, Sanksi Perpajakan, dan Tingkat kepercayaan pada Pemerintah terhadap Kepatuhan Wajib Pajak dalam Membayar PBB-P2
Authors: Yuliansyah Rahmat , Amaliati Setiawan Desy , Sri Mumpuni Rayahu
Published: March 2020

- This research aims to knowing effect understanding tax, tax sanction, and level of trust in the goverment againts taxpayers compliance in paying land and building tax - rural and urban in the sub-district Jatinegara. The population in this research were PBB-P2 taxpayers registered in Jatinegara sub-district as many as 27,761 taxpayers. The sample in this study amounted to 100 taxpayers obtained from the results of calculations using the Slovin formula. The method of collecting data in this study by distributing questionnaires. Questionnaire tests in this research, namely data quality test, classic assumption test, and hypothesis test. The results of this research indicate that there is a significant effect of the understanding variable on taxpayer compliance in PBB-P2 payments. This is evidenced by the positive regression coefficient (0.307) and tcount greater than the value of ttable (4.408> 1.98498) at the significance value (0,000 < 5%). There is a significant effect of tax sanction variable on taxpayer compliance in PBB-P2 payments. This is evidenced by the negative regression coefficient (-0.209) and tcount smaller than the value of ttable (-1.452 < 1.98498) at the significance value (0,150 > 5%). There is a significant effect of the level of trust in the government variable on taxpayer compliance in PBB-P2 payments. This is evidenced by the positive regression coefficient (0.654) and tcount greater than the value of ttable (6.540 > 1.98498) at the significance value (0,000 < 5%). Understanding, tax Sanctions, and the level of trust in the government have a significant effect of a manner together on taxpayers compliance in PBB-P2 payments. This is evidenced by the value of Fcount which is greater than the value of Ftable (28,113 > 2,70) at the significance value (0,000 < 5%).
Pengaruh Struktur Modal, Pertumbuhan, Ukuran Perusahaan dan Likuiditas terhadap Profitabilitas pada Perusahaan Pertambangan Periode 2012-2016
Authors: Sutan Indomo Uyung
Published: March 2020

Penelitian ini bertujuan untuk menganalisis pengaruh struktur modal, pertumbuhan, ukuran perusahaan dan likuiditas secara simultan terhadap profitabilitas pada perusahaan pertambangan yang terdaftar di BEI periode 2012-2016. Penelitian ini menggunakan metode penelitian kausal melalui pengujian hipotesa. Populasi penelitian ini adalah 40 perusahaan pertambangan yang terdaftar di BEI periode 2012-2016. Pemilihan sampel dilakukan dengan menggunakan metode non probability sampling dengan teknik purposive sampling sehingga diperoleh sebanyak 36 perusahaan. Jenis data yang digunakan dalam penelitian ini adalah data sekunder, berupa data laporan keuangan yang bersumber dari Indonesian Capital Market Directory (ICMD) dan Bursa Efek Indonesia. Data-data yang diperoleh dari hasil penelitian selanjutnya dianalisis dengan model regresi data panel menggunakan bantuan program software Eviews 9.0.

Ringkasan dari hasil penelitian ini adalah pertama, struktur modal terbukti berpengaruh negatif signifikan terhadap profitabilitas. Kedua, pertumbuhan perusahaan berpengaruh positif signifikan terhadap profitabilitas. Ketiga, ukuran perusahaan berpengaruh positif dan tidak signifikan terhadap profitabilitas. Keempat, likuiditas berpengaruh negative signifikan terhadap profitabilitas. Berdasarkan hasil penelitian yang dilakukan, terbukti bahwa struktur modal, pertumbuhan perusahaan dan likuiditas memiliki pengaruh yang signifikan terhadap profitabilitas perusahaan. Sehingga disarankan kepada pihak investor hendaknya memastikan pihak manajerial perusahaan mengelola struktur modal dengan seefisien dan seefektif mungkin serta mempertimbangkan bagaimana manajerial memanfaatkan dan mengelola segala sumber daya yang dimiliki perusahaan untuk meningkatkan pertumbuhan usahanya dan hendaknya lebih memperhatikan likuiditas perusahaan karena terbukti berpengaruh terhadap profitabilitas perusahaan.
Book Review: Social Spaces for Language Learning: Stories from the L-café Edited by Garold Murray and Naomi Fujishima
Authors: DiGiulio Anthony
Published: March 2020

Social spaces for language learning: Stories from the L-café describes the background, evolution and impact of the L-café, a social language learning space (SLLS) at Okayama University, Japan. This book is a must-read for anyone considering creating a similar space.
Copper(II) Complex Compounds with Mixed Hydrazone Ligands
Authors: Ion Emilia , Calinescu Mirela , Emandi Ana , Badea Victoria , Negoiu Dumitru
Published: March 2020

Three Cu(II) complex compounds with mixed hydrazone ligands have been prepared and characterized in view of their potential biological activity. The complex compounds have the formulas: [Cu(HLa)(Lc)Br], [CuLaLc] and [CuLbLc] . Na, where HLa = 4-dimethylamino benzaldehyde-2-benzothiazolyl hydrazone, H2Lb = 2-hydroxybenzaldehyde-2-benzothiazolyl hydrazone and HLc = 2-hydroxy-1-naphthyliden-N,N-dimethyl hydrazone. The complexes have been characterized by elemental and thermogravimetrical analysis, infrared, electronic and EPR spectra. EPR spectral studies of the complexes gave axial symmetry, with the ground state. The bonding parameters calculated from the electronic and EPR spectra indicate strong in-plane p-bonding for all the complexes. Investigations on antibacterial and antifungal activities show that the complexes are more active than the free ligands against various Gram positive, Gram negative bacteria and fungi.
Study of High Precision of Low Absorbed Dose Determinations using Chemical Dosimetry
Authors: Nedelcu Georgiana Madalina , Zaharescu Traian , Podina Corneliu , Mihalcea Ion
Published: March 2020

A study on chemical dosimetry with the purpose of the elaboration of high precision method for low absorbed dose determination in the case of 137Cs gamma irradiation is presented. A dosimetric solution of ferrous sulfate was used and the dependence of Fe3+ ions concentration on the time irradiation was assessed by spectrophotometric method at 303 nm. From the slope of obtained straight line the dase rate was calculated. On this base the absorbed dose was estimated for each irradiation time. In order to evaluate the precision of dosimetric measurements the series of 12 dosimetric solutions were irradiated on the same conditions.
The Synthesis of N-nitroso bis (1ab,2a,7a,7ab-tetrahydro-1b-methylene-2,7-methano-1H-cyclopropa[b]naphthalene) amine
Authors: Olteanu Emilia , Drghici Constantin
Published: March 2020

The synthesis and the spectral characterisation of N-nitroso bis(1ab, 2a,7a,7ab-tetrahydro- 1b-methylene- 2,7-methano-1H-cyclopropa[b]naphtalene)amine(1) is reported. Also, the syntheses and the spectral characterisations of the following intermediates: N-(1ab, 2a,7a,7ab-tetrahydro-2,7-methano-1H cyclopropa[b]naphthalene-1b-methylene-1ab, 2b, 7b, 7ab-tetrahydro-2,7-methano-1H-cyclopropa[b] naphtalene-1b-carbinylamine (4) and N-Bis(1ab, 2a,7a,7ab-Tetrahydro-1b-methylene- 2,7-methano-1H-cyclopropa[b]naphtalene)amine(5) are reported.
Experimental Modelling of the Radionuclides Diffusion Process in Uranifer Tailing Dum
Authors: Bragea Mihaela , Perju Delia , Jinescu Gheorghita , Toro Laszlo , Cristache Carmen
Published: March 2020

Generally, the uranifer tailings dump are not protected. During the time appear chemical and physical modifications which favour spreading of the radioactive contaminant into the environment, because of the waters provided from precipitations with pH variation (acid rainfall, snow), solar radiance, variation of temperature and humidity, interaction of different minerals from the waste rock with infiltration water during the flow, leading to precipitations phenomenon, ionic exchange, adsorption and re-dissolving [2]. As a rule, the speed of radionuclides diffusion from radioactive tailings dump depends on each of these factors and is very specific to the hydro and geochemistry of the nearest rocks [7]. Because of that, the scientific research is very difficult and will obliges us to study through the simplified physical systems but maintaining the important parameters which are influencing the diffusion process of the contaminant in the environment. The main objective of this paper is to characterize hydro and geochemistry properties controlling the migration of radionuclides extracted from tailings dump into the environment, including the processes of sorption and adsorption and neglecting other physical processes as precipitation, ion exchange or some other geochemical interactions within the system. For this purpose we made studies on 226Ra and Unat extraction from uranifer tailings dump analyzed in pure water in dynamic system, studies about the influence of clay presence on speed of diffusion process in sorption and adsorption phenomenon. Finally we made a prediction for long term about variation of concentrations of 226Ra and Unat based on experimental data using some software programs from literature [8].
Unexpected Keto-enol Tautomerism in the Cyclopyridinophane Class Direct and indirect proofs
Authors: Dron Paul Ionut , Miron Neculai Doru , Surpateanu Gheorghe
Published: March 2020

The paper presents the synthesis of cyclo (bis-paraquat p-phenylene p-phenylene-carbonyl) tetrakis (hexafluorophosphate), named �CETOBOX�, and the closely related structural determinations. This compound exists in three tautomeric forms. These forms were evidentiated by NMR-data (1H-NMR, TOCSY, COSY, NOESY), UV-Vis spectra coupled with pH measurements and by synthesis. As the �CETOBOX� gives �in situ� only the corresponding monoylide, the synthesis of a new fluorescent indolizine cyclophane has been performed by a 3+2 cycloaddition. All structures of the new compounds presented herein have been established by NMR spectroscopy. Also, theoretical methods (MM3, AM1, AM1-COSMO and B88LYPDFT) have been used to determine the most stable conformer structures.
Dynamic Mechanical Analysis on Regenerated Cellulose
Authors: Cristea Mariana , Ionita Daniela , Simionescu Bogdan C.
Published: March 2020

Dynamical mechanical analysis was applied to two samples of cellulose (Cell 1 and Cell 2), obtained using the N-methylmorpholine-N-oxide blown technology in order to shed light on the secondary relaxations of cellulose. By tracking the storage modulus (E�), the loss modulus (E�) and loss factor (tand) vs. temperature it becomes possible to ascertain the dynamic molecular phenomena. A multiplex experiment (0.1, 0.5, 1, 5 and 10 Hz) was performed to calculate the apparent activation energy for the sub-glass transitions. Water and peculiarities of the fabrication process influence the dynamic mechanical behaviour of cellulose. To evidence the plasticizer/antiplasticizer role of water molecules four consecutive heating-isothermal-cooling cycles were accomplished.
Measurements and Theoretical Analysis of Excess Molar Volumes for Binary Mixtures of Dimethyl Sulfoxide with Xylenes
Authors: Ciocirlan Oana , Iulian Olga
Published: March 2020

Excess molar volumes, VE, have been measured for binary liquid mixtures of dimethyl sulfoxide (DMSO) with xylenes (o- xylene, m- xylene and p-xylene) at 298.15 K and atmospheric pressure. The excess volumes values were found negative over the entire composition range for all the mixtures. The VE values increase in order: p-xylene[ m-xylene[ o-xylene. The Flory and Prigogine-Flory-Patterson (PFP) thermodynamic theories of solution have been used to analyze the VE data. The calculated VE values were found to be in good agreement with the experimental data.
The Ozone Dynamics in the Stratosphere
Authors: Bourceanu Gelu , Onel Lavinia , Mihorianu Monica , Bourceanu Militina
Published: March 2020

This work studies the O3 dynamics in the stratosphere by taking into consideration the reactions of Chapman�s model, the reactions of the O3 consuming catalytic cycles by the species HOx, ClOx and NOx and the coupling reactions between these species. The study was accomplished through two reaction models formed by 44 and 76, respectively reactions. The reactions are taken from NASA data. We found that the larger the number of the coupling reactions is, the more the ozone is protected. Indeed, at steady state the O3 concentration is higher in the case of the 76 reactions model than for the 44 reactions model.
Influence of Thermal Aging on the Activity of a Heterogeneous Photo-fenton Catalysts
Authors: Iurascu Beatrice , Siminiceanu Ilie , Vicente Miguel
Published: March 2020

A new photo- Fenton catalyst has been manufactured from synthetic layered clay laponite (Laponite RD) by the pillaring technique. Eight different catalyst samples were prepared: four without thermal aging (WTA) calcined at 523 K, 623 K, 723 K and 823 K, and other four with thermal aging (TA) calcined at the same temperatures. The samples have been characterized by XRD and SEM/ EDS techniques, and through the bulk chemical analysis. The results of this characterization have been previously reported [8]. This paper presents the results regarding the activity of the catalyst samples, determined for the phenol degradation in water by the photo- Fenton process, using an aqueous solution of 0.1 mM concentration in the presence of 5mM H2O2, 1g/L catalyst, pH3, and 303 K. The activity of each catalyst sample was evaluated through the apparent first order rate constant derived from the experimental kinetic curves, representing the phenol conversion (XPh) versus reaction time.The best results were obtained with the TA- 623 catalyst.
Simultaneous Quantitative Analysis of Clorsulon and Ivermectin in a Veterinary Formulation by Artificial Neural Network
Authors: Pektas Gozde , Dinc Erdal , Baleanu Dumitru
Published: March 2020

Simultaneaous spectrophotometric determination of clorsulon (CLO) and invermectin (IVE) in commercial veterinary formulation was performed by using the artificial neural network (ANN) based on the back propagation algorithm. In order to find the optimal ANN model various topogical networks were tested by using different hidden layers. A logsig input layer, a hidden layer of neurons using the logsig transfer function and an output layer of two neurons with purelin transfer function was found suitable for basic configuration for ANN model. A calibration set consisting of CLO and IVE in calibration set was prepared in the concentration range of 1-23 �g/mL and 1-14 �g/mL, repectively. This calibration set contains 36 different synthetic mixtures. A prediction set was prepared in order to evaluate the recovery of the investigated approach ANN chemometric calibration was applied to the simultaneous analysis of CLO and IVE in compounds in a commercial veterinary formulation. The experimental results indicate that the proposed method is appropriate for the routine quality control of the above mentioned active compounds.
Light Noble Gases in the Geological Mass Extinction Layers in Hungary
Authors: Nishimura Chikako , Matsumoto Takuya , Matsuda Jun-Ichi , Detre Csaba H. , Don Gyorgy , Braun Tibor
Published: March 2020

The elemental abundance and isotopic ratio of He and Ar have been measured in the sedimentary rock samples of Permian (P) - Triassic (T) and Triassic (T) - Jurassic (J) boundary layers in Hungary. Low 3He/4He and high 40Ar/36Ar ratios as compared to the air values have been found, suggesting that radiogenic components are predominant in these layers. The 38Ar/36Ar ratios are also atmospheric. Thus, it is likely that all these isotopic ratios of noble gases are not indicating an extraterrestrial impact. However, there seems to be pulse increases of 3He concentration at the P- T boundary compared to other P and T samples. This still maintains the possibility that an extraterrestrial input is the cause for the mass extinction at the P- T boundary.
Enzymatic Synthesis of 15N-L-aspartic Acid Using Recombinant Aspartase from Escherichia Coli K12
Authors: Lupan Iulia , Chira Sergiu , Chiriac Maria , Palibroda Nicolae , Popescu Octavian
Published: March 2020

Amino acids are obtained by bacterial fermentation, extraction from natural protein or enzymatic synthesis from specific substrates. With the introduction of recombinant DNA technology, it has become possible to apply more rational approaches to enzymatic synthesis of amino acids. Aspartase (L-aspartate ammonia-lyase) catalyzes the reversible deamination of L-aspartic acid to yield fumaric acid and ammonia. It is one of the most important industrial enzymes used to produce L-aspartic acid on a large scale. Here we described a novel method for [15N] L-aspartic synthesis from fumarate and ammonia (15NH4Cl) using a recombinant aspartase.
The Synthesis and Characterization of some New Thioureides of 2-(4-Methyl-phenoxymethyl)benzoic Acid with Antimicrobial Activity
Authors: Limban Carmen , Missir Alexandru-Vasile , Chirita Ileana Cornelia , Nitulescu1 George Mihai , Ilie Corina , Caproiu Miron Teodor
Published: March 2020

It is well known that many compounds bearing thioureide structure have been reported to have antimicrobial activity and some of these thioureide compounds are found to be associated with other therapeutical activities. The present application is a continuation of our research concerning the synthesis and characterization of 2-(4-methyl-phenoxymethyl)benzoic acid thioureides with antimicrobial activities. The new thioureides were obtained in three stages. In the first stage we prepared the 2-(4-methyl-phenoxymethyl)benzoic acid by reacting potassium para-cresolate with phtalide. The second stage consists in the synthesis of the 2-(4-methyl-phenoxymethyl)benzoic acid chloride and, in the third phase, the acid chloride aforementioned is refluxed with ammonium thiocyanate the resulting 2-(4-methyl-phenoxymethyl)benzoyl isothiocyanate being treated with primary aromatic amines to obtain the new compunds. We established the optimal reaction conditions for the new compounds synthesizing process of with high purity and yields. The new compounds, which are not mentioned in the literature concerning this domain, have been characterized by their physical properties (melting point, solubility) and the structures were confirmed by elemental analysis, 1H-NMR, 13C-NMR and IR spectral methods.
Heterocycles 21. Reaction of 2-phenyl-thiazol-4-carbaldehyde with 2-bromoacetophenone
Authors: Zaharia Valentin , Silvestru Anca , Verite Philippe , Vlassa Mircea , Imre Silvia , Silvestru Cristian
Published: March 2020

The condensation reaction of 2-phenyl-thiazol-4-carbaldehyde with 2-bromoacetophenone was performed in basic catalysis, resulting in a mixture of 2,3-epoxy-1-phenyl-3-(2-phenyl-thiazol-4-yl)-propan-1-one (1), 1-phenyl-3-(2-phenyl-thiazol-4-yl)-propane-1,2-dione (2) and 2-phenyl-4,5-bis-(2-phenyl-thiazol-4-yl)-3-hydroxy-furane (4). The isolated solids were structurally investigated by spectroscopic methods, i.e. infrared spectroscopy, mass spectrometry and NMR. In solution the dicarbonylic derivative 2 undergoes a tautomeric process, resulting in the enol 2-hydroxy-1-phenyl-3-(2-phenyl-thiazol-4-yl)-prop-2-en-1-one 3. Compounds 3 and 4 were transformed in the corresponding acetyl derivatives 5 and 6, respectively, by reacting them with acetic anhydride. For the furane 4 the single crystal X-ray diffraction structure was determined.
The Characterization of Some Steel Corrosion Products by FT-IR Spectroscopy
Authors: Soare Aurel , Chiosa Valentina , Mandravel Cristina
Published: March 2020

The present work is a continuation of our precedent studies [1, 2] as an attempt to characterize the corrosion products formed on the carbon steel (OL 37) exposed to natural and artificial environments, both having high relative humidity and chloride content. Samples of steel sheets of 200 . 100 . 2 mm dimension were prepared using abrasive blasting with specific requirements. As natural and artificial environment, a marine experiment site, respectively a salt spray test with specific exposure conditions, were used. Iron oxyhydroxides and oxides are typical constituents of rust, generated by the corrosion of steel surface in contact with aqueous phase [3, 4]. The phase composition of the rust depends on the physic-chemical factors from the environment such as: type of steel, time of exposure, electrolyte composition, pH and temperature [5, 6]. The composition and structure of carbon steel corrosion products for the two situations (accelerated lab and real conditions) were studied comparatively using an adequate FT-IR spectroscopy method and KBr pellets technique. The FT-IR spectrometer operates with OPUS program.
Development and Validation of a High-performance Liquid Chromatography Method with Ultraviolet Detection for the Determination of Flunitrazepam in Human Plasma
Authors: Kiss Bela , Popa Daniela-Saveta , Bojita Marius , Loghin Felicia
Published: March 2020

A high performance liquid chromatography (HPLC) method was developed and validated for determination of flunitrazepam in human plasma. After a simple liquid-liquid extraction, the analyses were carried out on a ODS column with diode array detection at 330nm. The mobile phase consisted in a mixture of potassium dihydrogene phosphate/acetonitrile (40/60, v/v). The method showed good linearity, accuracy and precision. Advantages of this validated assay include a simple plasma extraction method, short analysis time and good sensitivity (LLOQ = 5ng/mL). The stability data indicated a potential instability of flunitrazepam in plasma at room temperature.
Synthesis of 4,6-Disubstituted Dihydrodipyridopyrazines and Assessment of Their DNA Binding
Authors: Grig-Alexa Irina-Claudia , Finaru Adriana-Luminita , Routier Sylvain , Caubere Christian Bailly Paul , Guillaumet Gerald
Published: March 2020

4,6-Disubstituted dihydrodipyridopyrazines have been synthesized and evaluated as antitumor agents. An investigation of their DNA binding capacities was performing. Compared to 4-monosubstituted dihydrodipyridopyrazines, corresponding disubstituted dihydrodipyridopyrazines showed lower affinity for DNA. Additional studies for their cytotoxic properties are underway.
Catanionic Organogelators Derived from D-Sorbitol and Natural Fatty Acids
Authors: Stan Raluca , Chira Nicoleta , Ott Cristina , Todasca Cristina , Perez Emile
Published: March 2020

Several catanionic organogelators derived from 1,3 :2,4-bis-O-(p-aminobenzylidene)-D-sorbitol (p-NH2-DBS) and hydroxy derivatives of natural fatty acids were synthesized, characterized and their gelation ability was evaluated. SEM observations of the xerogels formed by association of 1,3 :2,4-bis-O-(p-aminobenzylidene)-D-sorbitol and 12-hydroxystearic acid showed important modifications in the morphology and depend upon the nature of solvent as compared with the xerogels formed by each individual organogelator.
Pb Separation from Aqueous Media through a Liquid Membrane Process
Authors: Gheorghe Emil , Barbu Luminita , Luca Constantin
Published: March 2020

This work presents two versions of the Pb2+ separation method from aqueous phases through a membrane separation process with a liquid membrane of chloroform. The selectivity for Pb2+, in both ways, results from the presence in the membrane of macrocycle carrier benzo 18-crown-6. In the first one, yields higher than 90% are assured through coupling with the co-transported picrate anion involved in proton transfer process which provides the necessary energy for a pH gradient active transport mechanism. This mechanism requires a high acidity level of the aqueous receiving phase (pH =2). In the second version, which is based on the same membrane system, we use P2O74- anion as a complexing agent in the receiving phase, but the anion doesn�t disturb the transport mechanism and the yield at pH = 2 in receiving phase; at pH =11 the mechanism is completely changed and the yield tends to 90% again. The pyrophosphate anion has a high complexing effect for Pb2+ and the complex formed at the membrane-receiving phase interface diffuses in the receiving phase. In both versions, the transport of Pb2+ is an active process and it takes place in a reversed way versus the concentration gradient. It is important to note that Cd2+ is characterized by a very small transport yield, in comparison with Pb2+ which is weakly complexed by both carriers benzo 18-crown-6 and pyrophosphate anion. Both versions of this lead separation method are carried out in a double jet liquid membrane set-up which permits to operate in continuous working conditions.
Detection of the Process Equipment Components Flaws with the Aid of Thermography
Authors: Mazioud Atef , Durastanti Jean Felix , Ibos Laurent , Teodorescu Nicoleta
Published: March 2020

The paper presents the problem of the process equipment parts flaw detection with the aid of thermography instead of vibratory analysis. It is presented as an example, a new method (proposed by the authors) of the spalling in rolling-element bearings detection and diagnosis. The idea is to show the existing correlation between the outside temperature of the bearing cap and the vibratory level generated by increasing occurrence of the defect. An experimental study was performed on the test ring which allows the generation, in a progressive manner, of a spalling defect on the external ring of the rolling bearing. On this test rig, simultaneously were measured the mechanical vibration in the radial direction (by means of a piezoelectric accelerometer) and the bearing cap external surface temperature (by means of an infrared camera). The results exhibit a significant correlation between both measures. A detailed study of the heat transfer between the rolling elements and the spalling outside border permits evaluation of the temperature rise due to the heat generated from the defect.
Graphite Dispersions II.Modelling of Some Graphite Dispersion Properties in Different Binders
Authors: Radoiu Sorin
Published: March 2020

The target of the present study is to correlates some properties (pigment volumetric concentration and resistivity) of graphite films made with different binder (acrylic, polyurethane,chloryne-rubber,epoxy) using mathematic models, with a colorimetric property,chromaticity. Is also studied the optimization of the graphite volumetric concentration in chloryne-rubber binder, by using a mathematic model, depending on resistivity film.
Antioxidant Activity of Polyphenols from Sea Buckthorn Fruits (Hippophae rhamnoides)
Authors: Papuc Camelia , Diaconescu Cristiana , Nicorescu Valentin , Crivineanu Carmen
Published: March 2020

Lipid oxidation in foods can be retarded by the addition of antioxidants. Certain plants rich in compounds with antioxidant activity manifest an increasing interest in food industry because they retard oxidative degradation of lipids. Sea buckthorn (Hippophae rhamnoides), alcoholic extract was investigated for antioxidant activity. Sea buckthorn fruits were extracted with ethanol using a Soxhlet extractor and the crude extract was analyzed in order to establish total soluble phenolics and the antioxidant activity. The alcoholic extract of Sea buckthorn was found to contain phenols with antioxidant activity. The extract was studied for 1,1-diphenyl-2-picrylhydrazyl radical (DPPH), superoxide anion and hydroxyl radical scavenging activity. The extract was also studied for lipid peroxidation assay by thiobarbituric acid-reactive substances (TBARS) method. The results indicated that Sea buckthorn annihilates free DPPH radicals, the superoxide anion and the hydroxyl radical and it has an inhibitory effect upon lipid peroxidation process.
Magnesium Phosphates Binding Systems for Immobilizing Solvent Radioactive Wastes
Authors: Deneanu Nicoleta , Dulama Mirela , Teoreanu Ion
Published: March 2020

The immobilization process of radioactive solvent wastes produced during nuclear power plants operation tends to be safe and technically feasible perhaps its most important advantage from the safety point of view is the low chamber temperature and lower explosion risk. Radioactive solvent wastes resulted from Cernavoda NPP decontamination operations consist of miscellaneous acetone, toluene, methanol, chloroform, trichloroethan, white spirit, ethylene glycol and water. Magnesium phosphate binding systems are new cement-materials which could be used for the immobilization of radioactive wastes for the set-retarding effect of solvent radioactive waste in other matrices (Portland cement, composite cement). The paper presents the influence of mineral additive on the properties of solvent waste form, mainly the setting time and the leach rate of tritium. Results of the experiments have shown that using magnesium phosphate binding systems-mineral additive, could do the solidification of solvent radioactive wastes by better results. It can thus be anticipated that the level of expectation towards magnesium phosphate binding systems will remain high and probably increase for the other organic radioactive wastes (oils, scintillation liquids).
Biodegradation of Phenols by a Pure Bacteria of Pseudomonas Putida and by a Mixed Culture of Pseudomonas Various
Authors: Crutescu Roxana , Ungureanu Camelia , Vasilescu Paul
Published: March 2020

The paper presents the study of treatment of wastewaters resulted from a petrochemical platform. The purpose of this work was to simulate the industrial process under the Monod model and to determine if the model could be used for engineering working. The Monod model used to simulate the industrial process was based on equation Monod modified by Jarzebski et al. First, the biodegradation time was determined using the model at an initial phenols concentration of 23.4 mg/L and a pure culture of Pseudomonas putida for the phenols biodegradation. Then, the biodegradation time was determined in the same operating conditions, but using a mixed culture of bacteria, Pseudomonas (various species). In both cases the results were compared with the experimental time. The model provided good results compared to the industrial process when selecting a pure culture of Pseudomonas putida for phenols biodegradation.
Influence of Lead on Zinc Roofing Resistance to Atmospheric Corrosion
Authors: Faur Maria
Published: March 2020

The paper presents the researches carried out for the determination of the chemical heterogeneity influence of zinc roofing metallic surface on the resistance to atmospheric corrosion. Emphasizing of transformations taking place on the surface and inside the structure of metallic material, distribution, depth and form of corrosive attack, as well as micro-analysis of grain boundary and of adjacent corroded surfaces led to determine the lead influence. It was demonstrated the active role of lead, although it was considered harmless concerning the zinc roofing resistance to atmosphere corrosion, for the initiation and evolution of �pitting� corrosion process.
UV Protective Treatments of Cellulose Materials with b-Cyclodextrine Derivatives
Authors: Luca Constantin , Grigoriu1 Ana-Maria , Grigoriu Aurelia
Published: March 2020

The functionalization of cellulose materials with monochlorotriazinyl-b-cyclodextrine (MCT-b-CD) provides hosting cavities that can include a large variety of chemicals for specific textile finishing. In the present paper, we functionalized the textile fabric surface with MCT-b-CD through covalent bonding. After the treatment of modification, different UV protective chemical substances were �loaded� by spraying their solutions on the CD-functionalized fibers. Both untreated and treated fabrics were evaluated through UV and FT-IR-transmission. Our results indicate that the included components are efficiently hosted in the CD cavities and the fibers surface properties are significantly modified by the chemical treatment in the desired direction.
New Xanthene Structures
Authors: Iscrulescu Lucian , Sebe Ion , Atanasoaie Delia , Tantaveanu Elena , Mindruta Cristina
Published: March 2020

This paper examined the synthesis pathways for new compounds starting from raw materials on the anhydride type reacting with polyphenols. The compounds have been characterized through spectral analysis, with estimation yields for each reaction. Basic material syntheses are also presented.
SAR for Amine Salts of Carboxylic Acids to Hydractinia echinata
Authors: Chicu Sergiu Adrian , Grozav Mata , Kurunczi Ludovic , Crisan Manuela
Published: March 2020

The relationship between the structure and biological activity (toxicity) SAR of the stoichiometric mixtures between anion and cation (or neutral species) proceeded at pH 8.2 from the different amine salts of benzoic, acetic, oxalic, naphthalene carboxylic acids was determined. Their toxicity was determined by using the metamorphosis (transformation) process of the marine invertebrate Hydractinia echinata (Hydrozoa, Cnidaria) from the freely swimming larva to a sessile polyp as a biological test system. The two components of the stoichiometric mixture, the anion and the cation or neutral species react independently, but in a parallel way, the effectiveness of the cation/neutral species being superior. The studied compounds were grouped by their cationic/neutral structure and measured toxicity. All of these series were also characterized by a calculated mean value of the toxicity. The marine organism, Hydractinia echinata was a good and advantageous alternative for the toxicity testing systems with vertebrate.
Enhancement of Oxidation Processes of Cellular Microbial Substrate, Using UV Radiation in Resonant Elliptic Cavity
Authors: Braustein Harold E. , Cretescu Igor , Antohi Constantin , Diaconu Mariana , Macoveanu Matei
Published: March 2020

The improvement of disinfection efficiency for different contaminated fluid fluxes is related to the enhancement of oxidation processes at cellular level, developing original disinfection equipment. The construction of developed equipment is based on the amplification and focalization of UV germicide and bactericide radiation (wavelength l = 253.65 nm), using an elliptic cylinder shaped reflector and building up a resonant cavity for these radiations. Some theoretical considerations concerning the experimental device construction are described in the paper. The resonant elliptic cavity is used in LASER technique, as the �optic pumping� and this idea was involved in the developing of our equipment. Two TUV-60 lamps made by Philips Company were placed in the focal points of the elliptic cylinder (made by anodized aluminium) and a central quartz tube (symmetrical disposed between these lamps) was used as plug-and-flow photo-chemical reactor, through the fluid fluxes were passed. In these conditions the syntheses of chemical species with high oxidation capacity (hydroxyl radicals, ozone, etc.) can contribute to the advanced oxidation process of cellular microbian substrate. Distillated water and respectively an air flux contaminated with four types of pathogenic microorganisms (E.coli, Streptococcus sp., Salmonella sp., Pseudomonas aeruginosa) were used in all experiments. The best results were recorded in the case of gas flux due to synchrony of UV/Ozone effects when all pathogenic microorganisms were destroyed. In case of water flux were obtained the similar results, for E.coli and Pseudomonas aeruginosa. Salmonella sp. and Streptococcus, were still found in water after desinfection, as refractar pathogens in 34.3 % and respectivly 7.8 % in raport with initial CFU (104 colony formatting unities/mL).
Three Steps Columbite Method used to Prepare PMN-PT
Authors: Moisin Ana Maria , Dumitru Alina Iulia , Andronescu Ecaterina , Ghitulica Cristina
Published: March 2020

In the paper the elaboration of Pb(Mg1/3Nb2/3)O3 � PbTiO3 with a perovskite structure by using a variant of the columbite method is presented. Very often, in the elaboration process of this compound a secondary pyrochlore (Pb3Nb4O13) phase is obtained, due both to its high stability in comparison with the perovskite and to the evaporation of the lead oxide (PbO) during the processing. A new preparation variant has been used in order to avoid the formation of the secondary compound, namely a three step columbite method. The best sintering conditions were established by studying the densification of the material by scanning electronic microscopy. The crystalline perovskite phase was put into evidence by using X-Ray diffraction. The results showed the formation of the pyrochlore free Pb(Mg1/3Nb2/3)O3 � PbTiO3 (PMN-PT) ceramics in all the samples sintered at 1100 0C.
Behaviour of Cement CEM III / B under Acid Solutions Agression (I)
Authors: Teoreanu Ion , Pop2 Alice , Coarna Mariana , Natac Daniela
Published: March 2020

This paper aims at investigating the behaviour of a type CEM III/B cement under acid corrosion with formation of insoluble products. Cement paste and mortar specimens have been cured in sulphuric acid and phosphoric acid solutions. The samples have been kept in water up to 28 days and further 180 days in 0.5 mol/L acid solutions. At specific terms, the samples underwent compressive strength, chemical and X-ray diffraction analysis. The tests� results pointed out significant differences of chemical composition between the corrosion layers and the uncorroded core. The corrosion products formed in each acid solution were identified. In concretes with composite, ecologic cements the corrosion noticed on the cement pastes can be avoided. For that purpose during the preparation of the concretes there have to be achieved a high compactness and, consequently, a high impermeability. The binder matrix of the concrete is therefore, performing from the point of view of the resistance against the acid corrosion.
The Influence of Some Factors on Spirolactone Stability in Solution
Authors: Muntean Daniela Lucia , Imre Silvia , Voda Cosmina
Published: March 2020

The influence of some factors on spironolactone stability in solution was studied, by applying high-performance liquid chromatography, as a part of a pharmaceutical preformulation study in order to obtain a spironolactone solution for alopecia treatment. Solutions of 1 mg/ml spironolactone in aqueous ethanolic solution 1 : 1 and in 20 mM cyclodextrines solutions (b-, hydroxi-b- and methyl-b-cyclodextrine) was used, maintained at 8 and 22 �C, protected from light and after UV irradiation at 254 nm. The main degradation products were 7a-thiospirolactone and canrenone. The most stable solutions were the alcoholic ones and with methyl-beta-cyclodextrine, but the simultaneous action of temperature and UV irradiation allowed degradation processes after one hour of exposure, more aggressive in the presence of methyl-beta-cyclodextrine. In conclusion, for alopecia treatment with spironolactone a 1 mg/mL ethanolic solution could be used and it is recommendable the protection of treated zone.
Compositional Characteristics of Piatra �Verde Slanic Zeolitic Vulcanic Tuff
Authors: Mocanu Bogdan-Ion , Naum Nicolae , Lungu Cristian , Bombos Dorin , Bombos Mihaela
Published: March 2020

Using up-today analysis methods, this paper confirms existence like majority phase of the natural zeolite � clinoptilolite, to the prejudice of the heulandite, and proves the presence alongside of the clinoptilolite, an amount fine crystallizated silica in the Piatra-Verde Slanic zeolitic tuffs. This quantity of the fine crystallizated silica causes the appearance an �Hump effect� on the X-ray diffraction patterns in the range of the 15-35� (2q angles) and confers to this zeolitic tuff a very good pozzolanic reaction. Pozzolanic activity together with the good ionic exchange capacity could represent the premises of the complex utilizations of this clinoptilolitic tuff, such as nuclear decontamination of a contaminated with radionuclides streams and theirs safety stocking.
Mercury Removing from the Contamined Soil Using KI Solution. The pH Influence
Authors: Andoni Mihaiela , Iovi Aurel , Negrea Petru , Lupa Lavinia , Negrea Adina , Ciopec Mihaela
Published: March 2020

This paper presents an experimental work regarding the optimal conditions of pH for removing mercury from a contaminated soil sample using 0,1M solution of KI. A test stand with a column packed with contaminated soil has been done. A KI solution with neutral pH passes through the column, then a KI solution with acidic pH passes through another similar column and a KI solution with basic pH through the third column. It was collected periodically 10 mL fraction volume. The extracted mercury concentration from the solution is determined by atomic absorption spetrophotometry The results shows that the optimal conditions for cleaning the soil are using an acidic KI solution with a pH = 1, 5 � 2 and 150 mL of KI solution meaning 15 fractions of 10 mL each.
Effect of Berries Extracts on the Oxidative Stability of Silybum marianum Oil and its 20% Oil-in-water Emulsion
Authors: Pop Mariana , Lupea Alfa Xenia
Published: March 2020

The effect of Vaccinium vitis-idaea (mountain cranberry) and Vaccinium myrtilus (bilberry) fruits extracts on the stability of Silybum marianum oil and its 20% oil-in-water emulsion under ambient storage were investigated. The oxidation process of oil and emulsions was followed by measuring the peroxide value (PV), conjugated dienes (CD), conjugated trienes (CT) and p-anisidine value (p-AV).
The Investigation of the Neopluramycin � DNA System by UV-visible Spectroscopy
Authors: V�jan Loredana Elena
Published: March 2020

The self-association of neopluramycin and the binding of this drug to calf thymus DNA were investigated by using UV-visible spectroscopy. This classical pluramycin antibiotic self-associates in 1:1 ethanol - water mixture. Starting from a simple dimerization model, the molar absorption coefficient of monomer, the molar absorption coefficient of dimer and the dimerization constant were determined. The binding constant of neopluramycin to DNA was determined using Wolfe and Scatchard methods.
Theoretical Study of Some Benzene Derivatives in Water
Authors: Dimitriu Mihaela , Filip Elena , Humelnicu Ionel
Published: March 2020

Using the HyperChem programme, the influence of water on the properties of some monosubstituted aromatic compounds was studied from the point of view of the intermolecular interactions. There have been estimated some physico-chemical parameters of the benzene, fluorobenzene, chlorobenzene, bromobenzene, iodobenzene, nitrobenzene, phenol and aniline when solved in water, surrounded by one or two solvation spheres. The boundary lengths, total energies, border levels energy, dipole moments, polarizabilities, wavelengths and the probabilities of the electronic transitions have been obtained.
The Chemical Decontamination Process Intensification, using Ultrasounds
Authors: Pantru Eugenia , Jinescu Gheorghit , R�dulescu Rozalia , Olteanu Antoneta Filcenco , Jinescu Cosmin
Published: March 2020

This paper presents an intensive procedure used for the decontamination of the soils, which were radioactively contaminated by uranium, due to the occurrence of some antropic accidents, in order to limit the area�s pollution. The procedure used for the chemical decontamination of the polluted soils was the washing one and the decontamination degree is comparatively presented depending on the ultrasounds� presence and absence. The lab testes were performed on five types of soils , which were characterized from the granulometric, structural and chemical composition viewpoint, all these aspects represent the main factors, which determine the applied decontamination procedure�s limits and performances correlated with its utilization costs. The decontamination procedure�s kinetics for each type of soils was analyzed, using successively three different types of reagents (water, 0.1 M sulphuric acid solution and chloro-sodic solution � 100 g/L sodium chloride + 10 g/L sodium carbonate in water) for a solid to liquid ratio of 1:2, during 2 h, at a temperature of 20oC in a mechanic stirring system respectively in ultrasounds field. It was observed that the decontamination degree increases with up to 15-20% in case of the ultrasound field utilization comparing to the first case.
Exclusión Social de los Enfermos Mentales
Authors: Acevedo Castillo Amairani Abimelec
Published: March 2020

Las personas con enfermedad mental cada día se enfrentan a un sufrimiento que es causado por su padecimiento mental, luchan con las continuas limitaciones que están derivadas de la enfermedad,  además que en la actualidad se ha manifestado y notado en muchas de las acciones el  desconocimiento de la sociedad sobre la realidad de un enfermo mental y las circunstancias en las que se ven envuelto cada día.  No es fácil de afrontar  la exclusión social que se recibe por los demás, muchas veces puede determinar y amplificar la integración social de estas personas. Las actitudes sociales practicadas de una forma negativa suelen conllevar a una exclusión de las pueden producir una imagen social marginada que afecta el bienestar, adaptación y participación social, levantando de forma adicional barreras que darán un aumento en  el aislamiento y marginación de cada una de estas personas.
PERCEPCIÓN DE LOS PACIENTES Y FUNCIONARIOS SOBRE LA IMPLEMENTACIÓN DEL EXPEDIENTE CLÍNICO ELECTRÓNICO DEL MINISTERIO DE SALUD DE PANAMÁ
Authors: Varela Diana E.
Published: March 2020

La presente investigación titulada “Percepción de los usuarios y pacientes en cuanto a las ventajas y desventajas de la implementación del expediente clínico electrónico en el Centro de Salud de Río Abajo y el Policentro de Salud de Parque Lefevre”, como una herramienta del Sistema Electrónico de Información de Salud (SEIS), implementada en las instalaciones del Ministerio de Salud de Panamá en el 2013 en provincias centrales y en el 2015 en el área metropolitana, está basada en un estudio de tipo descriptivo – exploratorio, mediante la aplicación de un cuestionario estructurado, utilizando la escala de Liker, el cual fue dirigido y aplicado hacia los usuarios del expediente clínico electrónico (funcionarios), así como a los pacientes que acuden a atenderse en ambas instalaciones de salud. El objetivo de esta investigación fue analizar y discutir la percepción en el uso, ventajas y desventajas de la atención por medio del expediente clínico electrónico, y cuyos resultados obtenidos se plasmaron una vez se desarrollase la misma, destacando la importancia de la implementación de Tecnologías de Información y Comunicaciones (TIC´S) en la atención de salud de Panamá.