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Wyświetlanie 1-15 z 28
Tytuł:
Determination of kinetic parameters of decomposition of tetrahydropyrimidine derivatives
Autorzy:
Bhesaniya, K.
Patel, A.
Baluja, S.
Powiązania:
https://bibliotekanauki.pl/articles/411745.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
tetrahydropyrimidine derivative
TGA
DSC
kinetic parameter
Opis:
Some new tetrahydropyrimidine derivatives have been synthesized and their structural determination was done by IR, NMR and mass spectral data. Thermal analysis of these synthesized dihydropyrimidinthiones has been carried out by TGA and DSC techniques. From the thermograms, various kinetic parameters such as order of degradation (n), energy of activation (E), frequency factor (A) and entropy change (ΔS) have been evaluated. Further, thermal stability of tetrahydropyrimidine have been determined which is found to depend on the type of substituent present in the compounds.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 13; 23-32
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustain release Formulation and Evaluation of Ofloxacin floating delivery system
Autorzy:
Patel, A. J.
Naik, D. R.
Raval, J. R.
Powiązania:
https://bibliotekanauki.pl/articles/412207.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ofloxacin
ethyl cellulose
xanthum gum
floating drug delivery System
controlled release
Opis:
Floating tablets has been accepted as a process to achieve controlled drug delivery by prolonging the residence time of the dosage form at the site of absorption, thereby improving and enhancing the bioavailability of drug. The objective of present study outlines the development and characterization the floating drug delivery system of Ofloxacin to enhance its bioavailability and therapeutic efficacy, using different grades of polymer along with effervescent agent sodium bicarbonate and citric acid. Ofloxacin is a synthetic chemotherapeutic second-generation antibiotic of the fluoroquinolone class. Different tablet formulations were formulated by wet granulation technique and were evaluated for physical parameters like Tablet Thickness, Hardness, % Friability, Weight variation, Content uniformity, In vitro buoyancy, Swelling index, In vitro dissolution study and drug release mechanisms. As the concentration of the polymer in the formulations increased the release of drug decreased. Hence it was considered as suitable candidate for formulation as floating drug delivery system. Different kinetic models were applied to drug release data in order to evaluate release mechanisms and kinetics. The optimized formula F4 showed better sustained drug release with good floating properties and fitted best to be Korsmeyer-Peppas model with R2 value of 0.9575. As the n value for the Korsmeyer- Peppas model was found be more than 0.5 it follows Non-Fickian diffusion mechanism. FTIR result showed that there is no drug excipients interaction.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 12; 69-83
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microgrid-based cryogenic energy storage as a part of Intelligent Energy Infrastructure Management (IEIM)
Autorzy:
Głowacki, B.A.
Tomov, R.
Woźniak, M.
Patel, A.
Pałka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1372731.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
maszyna elektryczna
energia odnawialna
zarządzanie energią
electric machine
renewable energy
energy management
Opis:
Integration of advanced electrical machines with electrical power systems and renewable energy is at the heart of the dedicated Liquid Hydrogen Laboratory (LHL) at the University of Cambridge. Generation, storage and use of the hydrogen in conjunction with a patented dynamic energy storage system are an integral part of the proposed combined heat and power (CHP) IEIM Project. The aim of the project is to address intelligent energy infrastructure management IEIM of a smart micro grid, which combines hydrogen and electricity. To build a powerful relational database for the entire physical infrastructure based on combined heat and power elements, a sub-system needs to be established to monitor the status of interconnectivity to the grid. This information will be mapped onto the database to provide a real-time view of the energy network's physical interconnectivity with the grid, significantly reducing the environmental impact of the total electricity supply system. Considering the nature of the heat and power elements fibre optic based sensing techniques will remotely monitor the patching fields and provide an accurate map of the connectivity and constantly monitor changes in real-time.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2011, 4, 92; 13-16
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods
Autorzy:
Teich, L.
Schröder, C.
Müller, C.
Patel, A.
Meyer, J.
Hütten, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385684.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Mg
75.75.Jn
75.78.-n
Opis:
We present results of Monte Carlo and stochastic spin dynamics simulations of a magnetic nanoparticle model system based on experimentally produced samples. Thermodynamic investigations as well as spin dynamics studies show characteristic features, both resembling magnetic dipole glass behaviour. While spin dynamics studies at T=0 yield a multitude of low energy configurations, thermodynamic simulations show a clear transition between a paramagnetic and a frozen magnetic state. Moreover, we demonstrate the application of experimentally inspired demagnetization protocols to compute low energy configurations of the systems under consideration efficiently.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 374-376
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mitral regurgitation after anthracycline exposure: a case report
Autorzy:
Hartlage, Gregory R.
Cole, Palmer H.
Patel, Aarti A.
Morales, C. Alberto
Harrison, Eric E.
Powiązania:
https://bibliotekanauki.pl/articles/773456.pdf
Data publikacji:
2014
Wydawca:
Medical Education
Tematy:
anthracycline
cardiomyopathy
cardiotoxicity
mitral regurgitation
mitral valve repair
Opis:
We report the case of a 66-year-old African American female with a history of breast cancer previously treated with anthracycline based chemotherapy presenting with significant mitral regurgitation. She initially had preserved left ventricular systolic function with normal cardiac chamber dimensions, however, she developed progressive left ventricular chamber dilation and mild reduction in systolic function, which prompted surgical correction of her mitral regurgitation. After surgical mitral valve repair, she developed overt left ventricular failure with severe systolic dysfunction; however, she responded well to subsequent medical therapy.
Źródło:
OncoReview; 2014, 4, 4; A144-A147
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional appliances: The activator and the functional regulator- A review
Autorzy:
Kishnani, R.
Uppal, S.
Patel, G.
Acharya, A.
Metha, P.
Powiązania:
https://bibliotekanauki.pl/articles/1916521.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Activator
functional regulator
myofunctional appliances
Opis:
In this review of literature we are discussing the effects of functional appliances on the dentofacial structures in the treatment of Class II malocclusions. Despite recent questions on the effectiveness of early treatment, it is generally recognized that the use of growth modification still has a place in modern orthodontic practices. The aim of this review is to study growth modification of the mandible by two appliances: the activator and the functional regulator. Mechanism of action, design, effect on dentofacial structures, etc. of activator and the functional regulators are discussed here. Regardless of the appliance used, there are a large amount of variations in individual patient response to treatment. A second stage of treatment with a fixed appliance is necessary in most cases to ensure proper alignment and interdigitation of the dentition. Regardless of the appliance used, the success of treatment is dependent on patient cooperation.
Źródło:
Progress in Health Sciences; 2014, 4, 2; 150-156
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Phonon Dispersion in Alkali Metals
Autorzy:
Gajjar, P. N.
Thakore, B. Y.
Patel, H. K.
Jani, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/1933617.pdf
Data publikacji:
1995-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.25.Cx
63.20.Dj
Opis:
In the present paper, the calculation of the phonon dispersion relations for alkali metals to second order in a local pseudopotential is discussed in terms of the real-space sum. Different forms of dielectric functions are employed to judge the varying effects of exchange and correlation on the phonon frequencies. The quantitative agreement of phonon frequencies for the alkali metals reflects, satisfactorily, the experimental trend.
Źródło:
Acta Physica Polonica A; 1995, 88, 3; 489-502
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomorphic Control on Soil Erosion – a Case Study in the Subarnarekha Basin, India
Autorzy:
Kathwas, Amar Kumar
Patel, Nilanchal
Powiązania:
https://bibliotekanauki.pl/articles/2088182.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
geomorphological feature
soil erosion
USLE
principal component analysis
Opis:
Geomorphology depicts the qualitative and quantitative characteristics of both terrain and landscape features combined with the processes responsible for its evolution. Soil erosion by water involves processes, which removes soil particles and organic matter from the upper sheet of the soil surface, and then transports the eroded material to distant location under the action of water. Very few studies have been conducted on the nature and dynamics of soil erosion in the different geomorphologic features. In the present investigation, an attempt has been made to assess the control of geomorphologic features on the soil loss. Universal Soil Loss Equation (USLE) was used to determine soil loss from the various geomorphological landforms. Principal component analysis (PCA) was implemented on the USLE parameters to determine the degree of association between the individual principal components and the USLE-derived soil loss. Results obtained from the investigation signify the influence of the various landforms on soil erosion. PC5 is found to be significantly correlated with the USLE-derived soil loss. The results ascertained significant association between the soil loss and geomorphological landforms, and therefore, suitable strategies can be implemented to alleviate soil loss in the individual landforms.
Źródło:
Polish Journal of Soil Science; 2021, 54, 1; 1-24
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maximizing power output of a partially shaded total-cross-tied photovoltaic array
Autorzy:
Shah, N. S.
Patel, H. H.
Powiązania:
https://bibliotekanauki.pl/articles/136262.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
current compensation
voltage equalization
MPPT
partial shading
TCT configuration
Opis:
Non-uniform conditions on the modules of the PV array, especially, partial shading reduces the output of the PV array to a large extent. The shaded module in a string limits the current of the entire string and hence, the output power of the string. The output power under such conditions is reported to be higher for total-cross-tied (TCT) configuration. This paper describes two different approaches, one based on current compensation (current equalization) and another based on voltage equalization, to extract higher power from the partially shaded total-cross-tied photovoltaic array. The TCT configuration is considered to minimize the number of converters, sensors, cost and complexity involved. The additional converters in the two distinct approaches evaluated here operate only when the partial shading occurs and are controlled to minimize the current and voltage miss-matches. The analysis and the control algorithm are presented. Simulation results obtained in MATLAB/Simulink are included to demonstrate the effectiveness of both methods and the relative merits and demerits of these approaches are highlighted.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 1; 10-18
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mesogenic Dependence of Chalconyl Schiff’s Bases on Molecular Rigidity and Flexibility
Autorzy:
Pandya, S. H.
Patel, V. R.
Doshi, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/1178290.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Enantiotropy
Liquid Crystals
Mesomorphism
Nematic
Smetic
Opis:
A novel homologous series R0-C6H4.CH:N-C6H4.CO.CH:CH-C6H4-OC6H13(n) of liquid crystal property is synthesized and studied with a view to understand and establish the effect of molecular structure on liquid crystal properties with respect to Schiff base and chalconyl central bridges as well as changing left n-alkoxy terminal and right n-hexyloxy fixed tail ended group. Homologous series consisted of eleven (C1 to C16) homologues in which the nematogenic mesomorphism commences from C3 homologue and continued to last C16 homologue without exhibition of smectogenic property. Rest of the C1 and C2 homologues are nonmesomorphic, whose Latent transition temperature (LTT) are predicted by extrapolation of N-I transition curves. Odd-even effect is observed for N-I transition curve. N-I transition curve and Cr-N/I transition curve behaved in normal manner. The Nematic thermal stability is 72.2 ° C. The minimum and maximum nematogenic mesophaselengths are ranging between 12.0 °C and 30.0 °C at C16 and C14 homologue respectively. Transition temperatures were determined by an optical polarizing microscopy (POM), equipped with a heating stage. Thermal analytical and spectral data confirms the molecular structures of homologues. The novel homologous series of chalconyl Schiff’s base is low melting series, whose mesogenic transition temperatures ranges between 43.0 °C and 79.0 °C.
Źródło:
World Scientific News; 2017, 86, 3; 242-252
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recurrent upper gastrointestinal bleed in a 26 year old female
Autorzy:
Heavener, T.
Patel, P.
Garner, J.
Sing, J.
Jeffries, M.
Thomas, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/1918636.pdf
Data publikacji:
2018-06-21
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Anemia
coil migration
endoscopy
Opis:
According to recent society guidelines, upper gastrointestinal bleed initial approach includes assessment of hemodynamic status, fluid resuscitation if necessary, transfusion strategy to target hemoglobin above 7 (g/dL), use of intravenous proton pump inhibitor and generally upper endoscopy within 24 hours. We present a case of a 26-year-old woman who sought treatment after one episode of hematemesis and pre-syncope. She had a similar presentation three months earlier and received interventional radiology-guided mesenteric angiography and the use of multiple coils to embolize a 1.5-cm deep punched-out duodenal ulcer. Migration of the coil was noted on endoscopy within the previously described ulcer. Coil migration is expected to occur in up to 3% of cases of endovascular embolization. However, migration into the duodenum is uncommon and could have actually been a contributing factor to the current bleed.
Źródło:
Progress in Health Sciences; 2018, 8(1); 231-233
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is Social Software a New Mode of Second-Language Learning in the Information Age?
Autorzy:
PATEL, H. B.
Powiązania:
https://bibliotekanauki.pl/articles/628099.pdf
Data publikacji:
2013
Wydawca:
Fundacja Pro Scientia Publica
Tematy:
social learning, social media, information age, information technologies, education, internet, pedagogy
Opis:
The basic characteristics of social media mirror much of the rhetoric and thinking aro-und educational reform in the modern world context. The basic cultural relevance of social media to young people enables them to learn how to bring their social life into the matrix of school activities. It also provides young learners with different audiences for different activities. Today, social media are probably the critical component in enabling individuals, both teachers and learners, to construct their own personal learning networks. Joining, building, growing and managing digital communities, whether relatively open or relatively closed, enables teachers and learners to connect with others with similar interests and to learn from other participants in those communities.
Źródło:
Journal of Education Culture and Society; 2013, 4, 2; 116-123
2081-1640
Pojawia się w:
Journal of Education Culture and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, characterization and analytical applications of chelating resin containing orcinol
Autorzy:
Shah, B. A.
Shah, A. V.
Patel, N. B
Shah, M.
Powiązania:
https://bibliotekanauki.pl/articles/779773.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
separacja analityczna
żywice chelatujące
kopolimery
wymiana
analytical separation
chelating resin
column operation
copolymer
exchange capacity
Opis:
A chelating resin based on Salicylic acid-Formaldehyde copolymer, containing Orcinol (SFO), has been synthesized and characterized on the basis of Elemental Analysis, Particle Size Distribution, FT-IR Analysis, XRD, SEM and Optical Photographs. The Physico-Chemical properties have been studied. This resin is highly stable in acidic and alkaline solutions and has been studied as a chelating sorbent for heavy metal ions and transition metal ions. The Exchange capacity order is Ni(II) > Cu(II) > Zn(II) > Cd(II) > Pb(II). The effect of nature and concentration of different electrolytes on distribution coefficient (Kd) for metal ions have been investigated. Separation of synthetic mixtures containing Cu(II)-Pb(II), Ni(II)-Cd(II) and Brass constituents has been carried out using a column prepared from the synthesized chelating resin. The developed procedure was also tested for the removal of Cd(II) and Pb(II) from natural water of Purna River near by Navsari, Gujarat, India. Keywords
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 2; 88-96
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nematogenic Mesophase Induced from Two Nonmesomorphs and Determination of LTT for Common Nonmesomorphic Component by Extrapolation
Autorzy:
Solanki, Ravindra
Patel, R. B.
Doshi, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/1179586.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Binary System
Eutectic point
Mixed melt
Mixed mesomorphism
Nematic
Opis:
Three binary systems (A+B1, A+B2, A+B3) consisted of both admixed components as nonmesomorphs induces mesomorphic property as nematogenic mesophase within definite range of concentration of component - A. The Isotropic- Nematic (I-N) transition curves of each binary systems are extra polated to 100 mole percent of nonmesomorphic component –A to determine its reliable latent transition temperature (LTT) and to derive the group efficiency order. The common component A is a Schiff’s base, P-tolal. P’- Phenetidine (109 °C), uncommon component B1 and B2 are also Schiff’s bases p-Chloro benzal P’- chloroaniline (M.P 111.0 °C) and p-Anisal p’-Toluidine (M.P 92.0 °C) respectively, whereas, component B3 is a chalcone α- 4 methoxy phenyl β 4’-pentyloxy benzoyl ethylene (M.P 91.0 °C). The reliable predicted LTT of common component –A are 99.5 °C, 99.0 °C and 101.0 °C from binary systems A+B1 ,A+B2 and, A+B3 respectively. The group efficiency order derived is B2>B1>B3 from range of mesomorphism.The melting point of common and uncommon nonmesomorphic components are confirmed with previously reported values. Suitable magnitudes of anisotropic forces of intermolecular attractions as a consequence of resulted molecular rigidity and flexibility through respective polarity and polarizabilities of nonmesogenic components of the mesogenic mixitures which play an important role in inducing mesomorphism.
Źródło:
World Scientific News; 2017, 74; 68-79
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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