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Wyświetlanie 1-15 z 49
Tytuł:
Preservative potential of cumin essential oil for Pisum sativum L. during storage
Autorzy:
Kumar, N.
Powiązania:
https://bibliotekanauki.pl/articles/66274.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cumin
Cuminum cyminum
essential oil
Pisum sativum
pea
seed
storage
pest
Opis:
The samples of stored seeds of pea (Pisum sativum L.) were collected from 30 farmer markets. The mycobiota analysis showed presence of 15 fungal species and one species of insect Callosobruchus chinensis. The fungi such as Aspergillus flavus, A. niger, A. ochraceous, A. terreus were found to be dominant based on percent frequency of each in blotter method in unsterilized and sterilized seeds 18.9–7.9, 15.0–3.9, 12.2–3.7, 10.1–1.7, respectively, and in agar plate technique 17.9–8.3, 15.1–9.5, 12.8–5, 7.9.7–6.7, respectively. These species showed reduction in terms of weight loss, germination and protein content in pathogenicity testing. Essential oil extracted by hydrodistillation from fruits of Cuminum cyminum L. was evaluated against the most common occurring funi such as A. flavus and A. niger as well as the insect species C. chinensis and the oil exhibited high toxicity. The oil killed the tested fungi and showed thermostable nature at its minimum inhibitory concentration (MIC) of 400 ppm. The oil safely preserved pea seeds up to 120 days at 0.50 (1,000 ppm) and 0.76 ml (1,500 ppm) in polyethylene and jute bags of 500 ml capacity containing 400 g seeds separately. There were no changes in organoleptic appereance of food seeds during storage. The oil has beneficial effect on number of visible nodule formation and shoot and root dry biomass of 15-day-old plants in comparison to control sets. The cumin oil was analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS).
Źródło:
Journal of Plant Protection Research; 2016, 56, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preterm birth and perinatal outcome: an observational cohort study
Autorzy:
Kumar, N.
Yadav, A.
Powiązania:
https://bibliotekanauki.pl/articles/2088201.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
pregnancy
infant
newborn
intensive care units
Opis:
Background: Preterm birth is a common cause for neonatal morbidity and mortality worldwide. Aim of the study: To compare perinatal outcomes in preterm and term neonates. Material and methods: The present cohort study was conducted in the Obstetrics and Gynecology Department of MMIMSR, Ambala, a rural tertiary care center of Northern India over a one-year period (January-December 2018). 2,997 antenatal women were recruited at gestation (≥28 weeks) with singleton live pregnancies. All participants were divided into two groups: Group I: Antenatal women delivering at gestation (≥37 weeks) and Group II: Antenatal women delivering at gestation (≥28 to <37-weeks. Onset of labor, mode of delivery, perinatal outcome including birth weight, Apgar scores, Neonatal Intensive Care Unit (NICU) admission, need for intubation, complications, and mortality were compared between groups. Results: Of 2,997 deliveries, 2,528 (84.4%) were full-term, 469 (15.6%) preterm [48(10.2%) very preterm and 421(89.8%) late preterm] deliveries. The most common mode of delivery in both full-term and preterm participants was spontaneous vaginal delivery (62.8% vs 60.4%) followed by cesarean section (36.6% vs 39.2%). Preterm neonates (especially very preterm) had significantly lower birthweights (p<0.001, OR: 0.898; 95% CI: 0.108-7.48), 1-minute (p=0.018; OR: 7.812; 95% CI: 1.06-57.69) and 5-minutes Apgar scores (p=.000; OR: 3.410; 95% CI: 1.79-6.48) as compared to moderate- to- late preterm neonates. NICU admission rate, need for intubation, neonatal complications, stillbirth and early neonatal deaths were significantly higher in preterm neonates (p=.000). The most common complication in preterm neonates was Respiratory Distress Syndrome 172(55.1%) followed by sepsis 41(54.7%). Conclusions: Preterm delivery, especially very preterm, was significantly associated with adverse perinatal outcome as compared to full-term delivery.
Źródło:
Medical Science Pulse; 2019, 13, 4; 4-10
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cu2+/Zeolite catalyzed synthesis and evaluation of antimicrobial activities of some chalcones
Autorzy:
Thirunarayanan, G.
Kumar, N. Dinesh
Powiązania:
https://bibliotekanauki.pl/articles/1179609.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antimicrobial activities
Aryl chalcones
Cu2+/Zeolite
IR and NMR spectra
Opis:
Some aryl chalcones have been synthesized by Cu2+/Zeolite catalyzed aldol condensation of aryl methyl ketones and substituted benzaldehydes under microwave irradiation conditions. The yields of the synthesized chalcones are more than 85%. These chalcones were characterized by their physical constants and spectroscopic data. The antimicrobial activities of synthesized chalcones were studied by Bauer-Kirby disc diffusion method.
Źródło:
World Scientific News; 2017, 74; 251-266
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Waves along the Martian Ionopause
Autorzy:
Chmielewski, P.
Murawski, K.
Kumar, N.
Powiązania:
https://bibliotekanauki.pl/articles/1400415.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
94.20.wh
96.30.Gc
Opis:
We study the behaviour of surface waves propagating along the ionopause of the planet Mars and derive the onset criteria for unstable Kelvin-Helmholtz modes and negative energy waves at the Martian ionopause. Growth rate of unstable Kelvin-Helmholtz mode decreases with wavelength. The backward propagating waves became negative energy waves for the ionosheath velocity higher than critical velocity. It is found that short wavelength surface waves propagating along the Martian ionopause are less dispersive than long waves.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 156-161
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrothermal fabrication of CeVO4 nanoflowers assisted effective photocatalytic mineralization of aqueous methylene blue solution
Autorzy:
Muthuvel, I.
Jayasri, U.
Gowthami, K.
Kumar, N. Dinesh
Thirunarayanan, G.
Balakrishnan, K.
Rajachandrasekar, T.
Powiązania:
https://bibliotekanauki.pl/articles/1031461.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CeVO4
Cerium vanadate
Methylene Blue
Photocatalyst
Wastewater treatment
Opis:
A tetragonal zircon type cerium vanadate (CeVO4) photocatalyst was successfully synthesized hydrothermal method using Ce(NH4)2(NO3)6 and NH4VO3. The products were characterized using the FT-IR, XRD, FE-SEM and UV-DRS. The XRD results show that crystallite size of cerium vanadate is 27.2 nm. The effect of operational parameters such as effect of pH, catalyst suspension, initial dye concentration and reusability were observed. Hence the catalyst can be reused for continuous treatment of wastewater.
Źródło:
World Scientific News; 2020, 142; 103-119
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controllability of semilinear systems with fixed delay in control
Autorzy:
Kumar, S.
Sukavanam, N.
Powiązania:
https://bibliotekanauki.pl/articles/952777.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
first order delay system
mild solution
fixed point
exact controllability
Opis:
In this paper, different sufficient conditions for exact controllability of semilinear systems with a single constant point delay in control are established in infinite dimensional space. The existence and uniqueness of mild solution is also proved under suitable assumptions. In particular, local Lipschitz continuity of a nonlinear function is used. To illustrate the developed theory some examples are given.
Źródło:
Opuscula Mathematica; 2015, 35, 1; 71-83
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Complexation, Spectral and Antimicrobial Study of Some Novel 5-Bromo-2-Fluorobenzaldehydeoxime
Autorzy:
Kumar, K.
Santhi, N.
Powiązania:
https://bibliotekanauki.pl/articles/412258.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Substituted benzaldehyde
metals
complexes
antibacterial and antifungal activity
Opis:
In this newly approached method a novel series of Transition metal complexes were synthesized by the reaction of 5-bromo-2-fluorobenzaldehyde (1) react with hydroxylamine in ethanolic solution at room temperature. Mononuclear complexes were synthesized by reaction with Cu(II) , Zn(II) and Hg(II) chloride salts. The complexes were characterized by elemental analysis, Ultraviolet, Infra -red and 1HNMR spectral studies. The antimicrobial activities of the ligand and its metal complexes were estimated.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 3; 46-52
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance and stability analysis of series-cascaded, high-gain, interleaved boost converter for photovoltaic applications
Autorzy:
Prasanna Kumar, C.
Venugopal, N.
Powiązania:
https://bibliotekanauki.pl/articles/1193536.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
series cascade
interleaved boost converter
high gain
stability
fast Fourier transform
Opis:
Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 85-97
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oscillator Strengths of the 1s2s$\text{}^{1}$S$\text{}^{e}$ → 1s2p$\text{}^{1}$P$\text{}^{0}$ Transition in He
Autorzy:
Tiwary, S. N.
Kumar, P.
Powiązania:
https://bibliotekanauki.pl/articles/1887915.pdf
Data publikacji:
1991-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.10.+z
Opis:
The paper presents configuration interaction (CI) calculations of both the length and velocity forms of the oscillator strengths for 1s2s$\text{}^{1}$S$\text{}^{e}$ → 1s2p$\text{}^{1}$P$\text{}^{0}$ transition in the He atom. For the first time the agreement between the length and velocity values to within about 0.045% has been achieved.
Źródło:
Acta Physica Polonica A; 1991, 80, 1; 23-28
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on carcinogenic PAHs emission generated by vehicles and its correlation to fuel and engine types
Autorzy:
Kumar, V.
Kothiyal, N. C.
Powiązania:
https://bibliotekanauki.pl/articles/949327.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
polycyclic aromatic hydrocarbons
gas chromatography
pollutants
concentration
season
Opis:
The objective of this study was to find major PAHs produced in ambient air from the automobile exhaust as a function of fuels (diesel, petrol, and biodiesel) and engine type qualitatively and quantitatively. The recovery range was found between 30% and 70%. The study was carried out on two, three, and four wheelers. Biodiesel samples tested in the study were synthesized indigenously from different starting raw materials and analyzed for PAHs concentration in the exhaust on a Honda genset (EBK 2000AC Model). Biodiesel samples were blended with diesel in different ratio (25:75, 35:65 and 45:55) to investigate the exhaust behavior. Biodiesel was blended with Diesel the concentration of almost all PAHs reduces in comparison to pure Diesel exhaust. B(a)A and B(a) P was the common PAH found in higher concentration in almost all fuels. FTIR results indicate esterification of vegetable oil and NMR results indicate a complete conversion of oils into biodiesel.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 1; 48-58
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methanogens in the environment: an insight of methane yield and impact on global climate change
Autorzy:
Kumar Pandey, A.
Das, N.
Muthu Kumar, A.
Rao, S.
Powiązania:
https://bibliotekanauki.pl/articles/11130.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Methane is a most important greenhouse gas for planetary heating and it’s produced by methanogenic microorganisms as a metabolic byproduct and creates climate change. Methanogens are ancient organisms on earth found in anaerobic environments and methane is a key greenhouse gas concerned with methanogens. Therefore here is intense interest to writing this paper. A number of experiments have already conducted to study the methanogens in various environments such as rumen and intestinal system of animals, fresh water and marine sediments, swamps and marshes, hot springs, sludge digesters, and within anaerobic protozoa which utilize carbon dioxide in the presence of hydrogen and produce methane. The diversity of methanogens, belong to the domain Archaea and get involved in biological production of methane that catalyzes the degradation of organic compound as a part of global carbon cycle called methanogenesis. Majorly in this article we summaries the diversity of methanogens and their impact on global warming.
Źródło:
International Letters of Natural Sciences; 2015, 37
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical Notes : Practical Concerns Associated with Single-Number Ratings in Measuring Sound Transmission Loss Properties of Partition Panels
Autorzy:
Garg, N.
Kumar, A.
Maji, S.
Powiązania:
https://bibliotekanauki.pl/articles/177637.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Sound Transmission Loss
Sound Transmission Class
spectrum adaptation terms
ISO 717-1
weighted sound reduction index
spectrum adaptation term corresponding to noise source
Cx
TL
STC
Opis:
The paper presents an extensive review investigating the practical aspects related to the use of single- number ratings used in describing the sound insulation performance of partition wall panels and practical complications encountered in precise measurements in extensive frequency range from 50 Hz to 5 kHz. SWOT analysis of various single number ratings is described. A laboratory investigation on a double wall partition panel combination revealed the significant dependence of STC rating on transmission loss at 125 Hz attributed to 8 dB rule. An investigation conducted on devising alternative spectrums of aircraft noise, traffic noise, vehicular horn noise and elevated metro train noise as an extension to ISO 717-1 Ctr for ascertaining the sound insulation properties of materials exclusively towards these noise sources revealed that the single-number rating Rw + Ctr calculated using ISO 717-1 Ctr gives the minimum sound insulation, when compared with Rw + Cx calculated using the alternative spectrums of aircraft noise, traffic noise, etc., which means that material provides a higher sound insulation to the other noise sources. It is also observed that spectrum adaptation term Cx calculated using the spectrum of noise sources having high sound pressure levels in lower frequencies decreases as compared to ISO 717-1 Ctr owing to significant dependence of Ctr at lower frequencies.
Źródło:
Archives of Acoustics; 2013, 38, 1; 115-124
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric Sensitivity Analysis of Factors Affecting Sound Transmission Loss of Multi-Layered Building Elements Using Taguchi Method
Autorzy:
Garg, N.
Kumar, A.
Maji, S.
Powiązania:
https://bibliotekanauki.pl/articles/178151.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spectrum adaptation terms
weighted sound reduction index
orthogonal array
OA
analysis of variance
ANOVA
mass-air-mass resonance
Opis:
The paper presents application of Taguchi method in optimizing the sound transmission loss through sandwich gypsum constructions and those comprising of masonry concrete blocks and gypsum boards in order to investigate the relative influence of the various parameters affecting the sound transmission loss. The application of Taguchi method for optimizing sound transmission loss has been rarely reported. The present work uses the results analytically predicted on “Insul” software for various sandwich material configurations as desired by each experimental run in an L8 orthogonal array. The relative importance of the parameters on single-number rating, Rw (C, Ctr) is evaluated in terms of percentage contribu- tion using Analysis of Variance (ANOVA). The ANOVA method reveals that type of studs, steel stud frame and number of gypsum layers attached are the key factors controlling the sound transmission loss characteristics of sandwich multi-layered constructions.
Źródło:
Archives of Acoustics; 2014, 39, 2; 165-176
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Ni-20Cr coatings for high temperature applications - a review
Badania powłok Ni-20Cr do zastosowań wysokotemperaturowych - przegląd literatury
Autorzy:
Kumar, M.
Singh, H.
Singh, N.
Powiązania:
https://bibliotekanauki.pl/articles/352736.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot corrosion
nickel-chromium coatings
surface engineering
boilers
korozja wysokotemperaturowa
powłoki niklowo-chromowe
inżynieria powierzchni
kotły
Opis:
Hot corrosion is a serious problem in various high temperature applications. The thermal spray coatings provides possible solution to counter the problem of hot corrosion in high temperature environment and enhances the life of equipment. Ni-20Cr alloy compositions require long initiation time at which the hot corrosion process moves from the initiation stage to the propagation stage. In this review, the performance of Ni-Cr coatings by different investigators has been presented to understand the mechanism of hot corrosion under different environments.
Wysokotemperaturowa korozja jest poważnym problemem w zastosowaniach wysokotemperaturowych. Możliwym rozwiązaniem problemu korozji w warunkach wysokiej temperatury poprzez zwiększenie żywotności urządzeń jest zastosowanie termicznych powłok natryskowych. Stopy o składzie Ni-20Cr wymagają długiego czasu inicjacji, po którym proces korozji wysokotemperaturowej z etapu inicjacji przechodzi do etapu propagacji. W tym przeglądzie zostały zaprezentowane badania zachowania powłok niklowo-chromowych wykonane przez różnych badaczy, żeby zrozumieć mechanizm korozji wysokotemperaturowej w warunkach różnych środowisk.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 2; 523-528
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Solubility and Mass Transfer Coefficient of Benzoic Acid Through Hydrotropy
Autorzy:
Prakash, G.D.
Kumar, S.T.
Gandhi, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/779266.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
hydrotropy
solubilization
mass-transfer coefficient
benzoic acid
Opis:
The effect of hydrotropes such as sodium salicylate, sodium benzoate, and nicotinamide on the solubility and mass transfer coefficient of benzoic acid has been investigated. The solubility studies were carried out under a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303K to 333K). It has been observed that the solubility and mass transfer coefficient of benzoic acid increases with an increase in hydrotrope concentration and also with system temperature. A Minimum Hydrotrope Concentration (MHC) was found essential to initiate a significant increase in the solubility and the mass transfer coefficient. The maximum enhancement factor (?s), which is the ratio of the solubility value in the presence and absence of a hydrotrope, has been determined for all sets of experimentations. The solubility of benzoic acid has been enhanced to 19.98 times in the presence of 2.5 mol/L concentration of sodium salicylate hydrotrope at 333K.The effectiveness of hydrotropes was measured in terms of Setschenow constant Ks and the highest value has been observed as 0.502 for sodium salicylate.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 1; 46-50
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 49

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