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Wyświetlanie 1-15 z 85
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:
Reference Model of the International Supply Chain UN/CEFACT/BPA WG
Autorzy:
Clark, Colin
Doran, Mike
Lee, Ron
Patel, Umang
Yi-Yuan, Yueh
Powiązania:
https://bibliotekanauki.pl/articles/655845.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2002, 157
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of tunicamycin on the biogenesis of hepatitis C virus glycoproteins
Autorzy:
Reszka, Natalia
Krol, Ewelina
Patel, Arvind
Szewczyk, Boguslaw
Powiązania:
https://bibliotekanauki.pl/articles/1040320.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
glycoproteins
glycosylation inhibition
hepatitis C virus
tunicamycin
Opis:
Hepatitis C virus (HCV) infects humans, with a prevalence around 3% of population, causing acute and chronic hepatitis and hepatocellular carcinoma. We studied the effect of inhibition of glycosylation on the assembly of the HCV particle. HCV possesses two envelope glycoproteins E1 and E2 that are highly modified by N-glycans. These glycan residues are crucial for viral entry and maturation of the progeny. Here, we examined the influence of inhibition of N-glycosylation on expression of E1 and E2. Since the propagation of HCV in cell culture is limited, we used a recombinant baculovirus producing viral-like particles in insect cells. Our data showed that blocking of N-glycan transfer to the nascent polypeptide chain with the antibiotic tunicamycin resulted in the loss of E1 and E2. We also found that a dose of tunicamycin that did not influence the cell viability significantly reduced the E2 level in infected cells. The results indicate that blocking of glycosylation at an early step efficiently reduces the assembly of HCV virions. Thus, we suggest that derivatives of tunicamycin that preferentially block glycosylation of viral proteins may become potential therapeutic agents against HCV.
Źródło:
Acta Biochimica Polonica; 2010, 57, 4; 541-546
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Detection Using Computer Vision
Autorzy:
Patel, M.
Lal, S.
Kavanagh, D.
Rossiter, P.
Powiązania:
https://bibliotekanauki.pl/articles/226744.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
face detection
eye blink detection
fatigue
computer vision
Opis:
Long duration driving is a significant cause of fatigue related accidents of cars, airplanes, trains and other means of transport. This paper presents a design of a detection system which can be used to detect fatigue in drivers. The system is based on computer vision with main focus on eye blink rate. We propose an algorithm for eye detection that is conducted through a process of extracting the face image from the video image followed by evaluating the eye region and then eventually detecting the iris of the eye using the binary image. The advantage of this system is that the algorithm works without any constraint of the background as the face is detected using a skin segmentation technique. The detection performance of this system was tested using video images which were recorded under laboratory conditions. The applicability of the system is discussed in light of fatigue detection for drivers.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 4; 457-461
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anti-solvent sonocrystallisation of lactose
Autorzy:
Patel, S.R.
Murthy, Z.V.P.
Powiązania:
https://bibliotekanauki.pl/articles/185611.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
n-propanol
odzyskiwanie laktozy
antyrozpuszczalnik
lactose recovery
anti-solvent
sonocrystallisation
Opis:
The present work deals with ultrasound assisted crystallisation of lactose from lactose solution. The crystallisation of lactose was completed rapidly by applying the ultrasound waves in the presence of an anti-solvent (n-propanol), at the room temperature (30š3°C). The yield of lactose was found to be more than 85% (w/w) in 4 minutes of sonication. The spread of the crystal size distribution was found to decrease with increase in sonication time.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 379-389
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
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:
Physical properties of fresh mahua
Autorzy:
Patel, M.
Pradhan, R.
Naik, S.
Powiązania:
https://bibliotekanauki.pl/articles/24590.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
density
flower
fresh mahua
Madhuca indica
mahua
mass
moisture content
physical property
surface area
Madhuca latifolia zob.Madhuca indica
Sapotaceae
tree
fruit
edible fruit
edible flower
Źródło:
International Agrophysics; 2011, 25, 3
0236-8722
Pojawia się w:
International Agrophysics
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:
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:
Extraction protocol for isolation of CNSL by using protic and aprotic solvents from cashew nut and study of their physico-chemical parameter
Autorzy:
Gandhi, T. S.
Dholakiya, B. Z.
Patel, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/778109.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Cashew nut shell
Cashew nut shell liquid
Cardanol
Soxhlet apparatus
Opis:
Cashew nut shell liquid (CNSL) represents the largest readily available bioresource of alkenyl phenolic compounds. (CNSL) and its derivatives are widely used in polymer-based industries, synthesis of chemicals and intermediates, including bactericides, insecticides and surface active agents. In this work extraction of cashew nut shell liquid from cashew nut shell (CNS) was carried out by using the Soxhlet extraction method in the presence of polar & non-polar solvents. From the extracted CNSL, anacardic acid was selectively isolated and acid free CNSL was treated with liquor ammonia to separate the cardanol and cardol in the stepwise manner. Comparative study for the extracted CNSL and S-was performed. Higher amount of extracted CNSL was obtained from polar solvents. They were all characterized using quantitative analysis by HPLC.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 4; 24-27
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
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:
Numerical solution of non-Newtonian fluids flow past an accelerated vertical infinite plate in the presence of free convection currents
Autorzy:
Patel, M.
Timol, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/265022.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płyn nienewtonowski
analiza podobieństwa
prąd
non-Newtonian fluids
convection currents
similarity analysis
Opis:
A similarity analysis of non-Newtonian fluid flow past an accelerated vertical infinite plate in the presence of free convection current is carried out. A group theoretic generalized dimensional analysis is employed to achieve the governing non-linear ordinary differential equations in the most general form. Numerical solutions of these equations are given with the plot of their velocity profiles with the effects of Pr-Prandtl number and Gr-Grashof number.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 761-777
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of recast layer formation on the surface of Ti-6Al-4V titanium alloy during EDM process (machining carried out at lower range of machining parameters)
Badania wpływu parametrów procesu cięcia elektroerozyjnego na warstwę przetopioną stopu Ti-6Al-4V (przy zastosowaniu małych wartości wyładowań elektrycznych)
Autorzy:
Thesiya, D.
Patel, S.
Powiązania:
https://bibliotekanauki.pl/articles/175849.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
EDM
Ti6Al4V titanium alloy
SEM
recast layer
stop tytanu Ti-6Al-4V
warstwa przetopiona
Opis:
The recast layer forms during the machining of Ti-6Al-4V titanium alloy carried out with a use of electrical discharge machining (EDM). The paper presents the description of EDM process carried out at lower range of machining parameters also the formation process of recast layer. The recast layer was analyzed using scanning electron microscopy and 3D viewer image. The performed experiments involved application of copper and graphite electrode with positive polarity. In order to analyze the results, the authors used design of experiment (DOE) method – Taguchi technique (L18) with mixedlevel design. The influence of peak current (A), servo voltage (V), pulse on time (Ton) and pulse off time (Toff) on the recast layer was described in the article.
W artykule przedstawiono wyniki badań mikrostruktury warstwy przetopionej stopu tytanu Ti-6Al-4V w wyniku cięcia elektroerozyjnego (EDM), w zakresie małych wartości wyładowań elektrycznych z zastosowaniem miedzianej i grafitowej elektrody spolaryzowanej dodatnio. Dokonano analizy badań mikroskopowych przeprowadzonych z użyciem skaningowego mikroskopu elektronowego SEM, stosując zaawansowaną metodę DOE (ang. DOE – Design Of Experiments) wyznaczania wpływu zmiennych wejściowych na wynik analizowanego procesu. Wyznaczono wpływ parametrów prądowych – napięcia, czasu włączenia i wyłączenia układu na jakość warstwy przetopionej stopu tytanu.
Źródło:
Advances in Manufacturing Science and Technology; 2014, 38, 4; 53-59
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
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
Wyświetlanie 1-15 z 85

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