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    Wyświetlanie 1-7 z 7
    Tytuł:
    Quantum Noise Characteristics of Nonlinear Optical Amplifiers
    Autorzy:
    Boyd, R. W.
    Agarwal, G. S.
    Davis, W. V.
    Gaeta, A. L.
    Nagasako, E. M.
    Kauranen, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931479.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.50.Lc
    Opis:
    Quantum mechanical arguments show that any optical amplifier must add noise to the amplified beam of light. For the case of a high gain amplifier with a coherent (Poissonian) input, the signal-to-noise ratio of the amplified beam must be at least two times smaller than that of the incident beam. We review the theoretical basis of this prediction. We also describe the results of our experimental investigations of the noise properties of optical amplifiers that utilize the nonlinear optical response of strongly driven atomic transitions.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 117-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Delineation of EMS-induced genetic variability in some agronomic traits in mungbean, Vigna radiata (L.) Wilczek.
    Autorzy:
    Singh, Rupinder
    Agarwal, M.
    Kole, C. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2199155.pdf
    Data publikacji:
    2008-06-22
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    EMS
    genetic variability
    Mungbean
    Vigna radiata
    Opis:
    The investigation involved treatment of pre-soaked seeds (11h) of a mungbean cutivar, PUSA 9072 with five doses of ethyl methane suphonate (EMS) at 0.1, 0.25, 0.5, 0.75 and 1% for 4hr under dark. Observation on field grown mutagenized population with regard to 14 agronomic characters evidenced for induction of the variability in the M1 generation itself. The CV values of the traits for mutagenised population were stupendously higher for most of the test characters to the tune of 57% cases as compared to the untreated (control) plants...
    Źródło:
    Plant Breeding and Seed Science; 2008, 57; 21-24
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gold Nanoparticles with Elongated Shapes: Synthesis and Optical Properties
    Autorzy:
    Olejnik, M.
    Agarwal, A.
    Zaleszczyk, W.
    Kotov, N.
    Mackowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419540.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    81.07.Pr
    87.64.kv
    87.64.K-
    Opis:
    We use a seed-mediated growth to fabricate gold nanorods in water solution. By changing the amount of silver salt we demonstrate the control of aspect ratio of the obtained rods. The microscopic and spectroscopic analyses provide ways to characterize the morphology and the optical properties of the gold nanorods. Nanorods synthesized using this approach feature length of the order of 50-60 nm, which translates into longitudinal plasmon resonances in the near infrared spectrum region.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 346-349
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation and sensitivity analysis for biodiesel production in a reactive distillation column
    Autorzy:
    Agarwal, M.
    Singh, K.
    Chaurasia, S. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779118.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    biodiesel
    reactive distillation
    modeling
    simulation
    transesterification
    sensitivity analysis
    Opis:
    The conventional process for biodiesel production by transesterification is still expensive due to a need of high excess of alcohol required and its recovery by distillation. The use of a reactive distillation process can reduce the amount of alcohol in the feed stream as it works on a simultaneous reaction and separation. In the present study, a mathematical model has been developed for biodiesel production from triglycerides in a reactive distillation column, which has been validated with the reported data and CHEMCAD results. The effects of process parameters such as methanol to oil feed ratio, feed temperature, and reaction time have been investigated. The sensitivity analysis shows that yield of ester increases with methanol to oil ratio and number of stages, however, it decreases with fl ow rate. The MATLAB simulated results show that methanol to oil molar ratio of 5:1 produces 90% (by wt.) of methyl ester in a residence time of 4.7 minutes.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 3; 59-65
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropic Elastic and Acoustic Properties of Bulk Graphene Nanoplatelets Consolidated by Spark Plasma Sintering
    Autorzy:
    Koller, M.
    Seiner, H.
    Landa, M.
    Nieto, A.
    Agarwal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402122.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.Cg
    81.40.Jj
    81.05.ue
    81.20.Ev
    Opis:
    Elastic anisotropy and acoustic attenuation in bulk material consisting of consolidated graphene nanoplatelets are studied. The material was prepared by spark plasma sintering, and exhibits highly anisotropic microstructure with the graphene nanoplatelets oriented perpendicular to the spark plasma sintering compression axis. The complete tensor of elastic constants is obtained using a combination of two ultrasonic methods: the through-transmission method and the resonant ultrasound spectroscopy. It is shown that the examined material exhibits very strong anisotropy both in the elasticity (the Young moduli in directions parallel to the graphene nanoplatelets and perpendicular to them differ by more than 20 times) and in the attenuation, where the dissipative effect of the internal friction in the graphene nanoplatelets combines with strong scattering losses due to the porosity. The results are compared with those obtained for ceramic-matrix/graphene nanoplatelet composites by the same ultrasonic methods.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 670-674
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prosthetic status and prosthetic needs amongst geriatric fishermen population of Kutch coast, Gujarat, India
    Autorzy:
    Kumar, D.R.V.
    Raju, D.S.
    Naidu, L.
    Deshpande, S.
    Chadha, M.
    Agarwal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/874703.pdf
    Data publikacji:
    2015
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    geriatrics
    prosthetic status
    prosthetic need
    fisherman
    dental hygiene
    dental health
    environmental factor
    oral health
    human population
    Kutch coast
    Gujarat state
    India
    Opis:
    Background. Literature among fishermen of India is scanty. The external factors like diet, quality of dental hygiene and environmental factors have an effect on oral health. Moreover elderly age group offer very little importance towards their oral health. Objective. To assess the prosthetic status and prosthetic treatment needs among the geriatric fishermen population of Kutch coast, Gujarat, India. Material and Methods. A cross sectional descriptive study was conducted among 1200 elderly people (above 60 years) of Kutch coast, Gujarat, India. They were interviewed and examined using a proforma designed with the help of WHO Oral Health Survey 1997. Chi square test was used for comparisons. Confidence level and p-value were set at 95% and 5% respectively. Results. Out of 1200 elderly people, 836 were males and 364 were females. Considering the prosthetic status, majority (76.7%) had no prosthesis followed by full removable dentures (12.3%). An insight into the prosthetic needs showed that majority (27.3%) had a need for multiunit prosthesis. Conclusion. In this study, it was seen that overall prosthetic status was low and prosthetic need was high. Therefore new avenues have to be discovered to make the prosthetic treatment readily available to the elderly.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2015, 66, 2
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of putative miRNAs from expressed sequence tags of Gnetum gnemon L. and their cross-kingdom targets
    Autorzy:
    Krishnatreya, D.B.
    Ray, D.
    Baruah, P.M.
    Dowarah, B.
    Bardoloi, K.S.
    Agarwal, H.
    Agarwala, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096394.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microRNAs
    expressed sequence tags
    cross-kingdom
    Gnetum gnemon
    Opis:
    Wild edible plants are often found to be rich sources of nutrients and medicinally beneficial compounds with pharmacological activities. Gnetum gnemon is a nutritionally important plant and a popular food source in parts of Assam and North-East India. Various microRNAs (miRNAs) have been recently identified in many plants; however, there are no records of identification of miRNAs in any species of Gnetum. The prediction of miRNA-target associations in G. gnemon is an important step to facilitate functional genomics studies in this species. In the present study, all known miRNAs from plants available in public domain were used to search for the conserved G. gnemon miRNA homologues in publicly accessible expressed sequence tags (ESTs) in NCBI database. An aggregate of 20 new potential miRNAs belonging to two diverse miRNA families (miR399 and miR5021) were identified through a homology-based search by following stringent filtering criteria. To investigate the potential cross-kingdom effects of the identified miRNAs, we further identified the putative target genes of G. gnemon miRNAs in human transcriptome and analyzed them against the NCBI non-redundant protein database. The KEGG analysis of the target genes indicated that these genes were involved in different metabolic pathways such as caffeine metabolism, drug metabolism, and nitrotoluene degradation. The target genes of G. gnemon miRNAs in humans were found to be associated with various disorders of both hereditary and non-hereditary origin. These results could help to shed new light on understanding of miRNA-mRNAs functional networks in this species and its potential use as a small RNA-based therapy against some human diseases.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 2; 179-195
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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