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Wyszukujesz frazę "Nair, R. R." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Improved oil production by membranes
    Autorzy:
    Nair, R. R.
    Saltveit, K. J.
    Protasova, E.
    Bilstad, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/298791.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    designer water
    NF membranes
    IOR
    seawater
    Opis:
    The objective of this presentation is to show connections of activities leading to improved oil recovery (IOR) when prospecting for oil and gas. Increased wettability of injected water into the reservoirs is caused by specific ions. Technical limitations for production of designer water from seawater by membrane separation are high-lighted. Desirable characteristics of designer water are low NaCl concentrations and high divalent ion concentrations for improving wettability of Crude Oil, Brine and Rock (CBR). Experimental setup incorporated nanofiltration (NF) membranes for ion separation. Retentate from NF contains the main constituents of Designer Water. A property of NF is to retain divalent ions. Performance of the membranes was evaluated in terms of flux and rejection under varying feed compositions, pressures and recovery rates. The research comprised a technical-economical study for salt separation. Results were evaluated in terms of desalination efficiencies and energy requirements. A sensitivity test, spiking Na2SO4 in the feed seawater, showed a decrease in retention of Cl with increasing SO42- concentrations. A reduced permeate flux resulted, however, with increasing Na2SO4 concentrations.
    Źródło:
    AGH Drilling, Oil, Gas; 2015, 32, 1; 221-232
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On polynomials in primes and J. Bourgains circle method approach to ergodic theorems II
    Autorzy:
    Nair, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1292659.pdf
    Data publikacji:
    1993
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Opis:
    We show that if q is greater than one, T is a measure preserving transformation of the measure space (X,β,μ) and f is in $L^{q}(X,β,μ)$ then if ϕ is a non-constant polynomial mapping the natural numbers to themselves, the averages $π_{N}^{-1} ∑_{1≤p≤N} f(T^{ϕ(p)} x) (N = 1, 2, ...) converge μ almost everywhere. Here p runs over the primes and $π_N$ denotes their number in [1, N].
    Źródło:
    Studia Mathematica; 1993, 105, 3; 207-233
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On strong uniform distribution
    Autorzy:
    Nair, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1392186.pdf
    Data publikacji:
    1990
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Acta Arithmetica; 1990, 56, 3; 183-193
    0065-1036
    Pojawia się w:
    Acta Arithmetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On a characterization of symmetric balanced incomplete block designs
    Autorzy:
    Mohan, R.
    Kageyama, Sanpei
    Nair, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/729802.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    symmetric balanced incomplete block (SBIB) design
    Opis:
    All the symmetric balanced incomplete block (SBIB) designs have been characterized and a new generalized expression on parameters of SBIB designs has been obtained. The parameter b has been formulated in a different way which is denoted by bi, i = 1, 2, 3, associating with the types of the SBIB design Di. The parameters of all the designs obtained through this representation have been tabulated while corresponding them with the suitable formulae for the number ofblocks bi and the expression Si for the convenience of practical users for constructional methods of certain designs, which is the main theme of this paper.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2004, 24, 1; 41-58
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Morphological Studies of Nano-crystalline Ceramic BaSr0.9Fe0.1TiO4
    Autorzy:
    Jacob, R.
    Nair, H. G.
    Isac, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/411662.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Barium Strontium Ferric Titanate (BaSr0.9Fe0.1TiO4)
    Perosvkites
    Debye Scherrer formula
    Opis:
    The development of lead-free piezoelectric materials have gained great attention for the consideration of environmental protection. Nanosized BaSr0.9Fe0.1TiO4, a lead free perovskite phase structured ceramic was prepared via a high-energy ball milling process through mechanically assisted synthesis. The sample was analyzed by X-ray Diffraction (XRD), SEM and EDX. The XRD results and XPERT-PRO software analysis confirmed the orthorhombic system of the sample. Scanning Electron Microscopy (SEM) analysis revealed that its crystallite size is in the nano meter range. The grain size was less than 100 nm and showed a strong tendency for agglomeration. It also confirmed with the calculated value from Debye Scherrer’s formula. EDX spectrum shows the elemental composition of the sample. Williamson-Hall Plot method was used to evaluate the size and lattice strain. The dislocation density and the morphology index of the sample were also calculated.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 41; 100-117
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation and Compensation of IQ Imbalance in SWIPT System
    Autorzy:
    Nair, Ajin R.
    Kirthiga, S.
    Jayakumar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055272.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SWIPT
    power splitting
    iq imbalance
    energy harvesting
    hardware impairments
    blind compensation
    Opis:
    Although there are many articulations of SWIPT architecture implementations, the hardware impairment aspect involved in the SWIPT architecture system is not given much attention. This paper evaluates the performance of SWIPT PS Receiver architecture in the presence of IQ imbalance hardware impairment with 16-QAM transmitter and AWGN channel. The parameters SNR, BER is evaluated in the presence of amplitude, phase imbalance, and PS factor at the SWIPT receiver side. Further, the IQ imbalance is estimated and compensated using a blind compensation algorithm. The system achieved a maximum BER of 10−7 in the presence of amplitude and phase imbalance of 0.2 and 1.6 respectively.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 679--684
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hypolipidemic action of rutin on triton WR-1339-induced hyperlipidemia in rats
    Autorzy:
    Livingston Raja, N.R.
    Nair, A.R.
    Senthilpandian, S.
    Ravi, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2098294.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    rutin
    flavonoids
    triglyceride
    atorvastatin
    Triton WR-1339
    hyperlipidemia
    cholesterol
    rat
    Opis:
    Introduction and objective. Hyperlipidemia is considered as a serious communal problem in developed countries, caused by an excess level of cholesterol in blood circulation. It leads to chronic illness and even death in human beings. As the currently available drugs cause unexpected side-effect, the aim of this study is to concentrate on naturally occurring flavonoids which can potentially provide defensive and therapeutic effects in atherosclerosis diseases, and investigate the hypolipidemic effect of rutin on Triton WR-1339 triggered hyperlipidemia in a rat blood sample. Materials and method. Rats were randomly prearranged into five different groups of five rats each. Group-I was the non-disease control and administered normal saline. Group-II was the atherogenic control, administered Triton WR 1339 (200 mg/kg BW). Group-III was standard and received Atorvastatin. The last two groups (IV, V) were tested (I&II) by administering administered Rutin (40 mg/kg, 80 mg/kg) orally. The test material (I&II) and the standard drug were administered for seven days. After the last dose, blood samples were collected and the lipid levels estimated in the blood samples. Results. Rats treated with rutin flavonoid at a dose of 40 mg/kg & 80mg/kg exhibited a reduction in Total Cholesterol, Triglycerides, Low Density Lipoprotein (LDL) and Very Low Density Lipoprotein (VLDL). Rutin also increases the High Density Lipoprotein (HDL), compared with control rats. Rutin treated rats exhibited dose-dependent hypolipidemic activity. The protection percentage of rutin against hyperlipidemia was observed as 41.89%, 55.57% whereas the atorvastatin treated group protection was observed at 60.63%. Conclusions. The results of the study revealed that rutin showed a significant hypolipidemic effectiveness on Triton WR- 1339 induced hyperlipidemia in rats.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2021, 15, 2; 51-55
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effectiveness of feminine and masculine leadership styles in relation to contrasting gender’s performances
    Skuteczność kobiecych i męskich stylów przywództwa w odniesieniu do dokonań płci
    Autorzy:
    Faizan, R.
    Nair, S. L. S.
    Haque, A. U.
    Powiązania:
    https://bibliotekanauki.pl/articles/406044.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    cross-cultural comparison
    contrasting economies
    gender
    masculine leadership
    feminine leadership
    porównania międzykulturowe
    kontrastujące gospodarki
    płeć
    przywództwo męskie
    przywództwo kobiece
    Opis:
    This paper focuses on the impact and effectiveness of feminine and masculine styles of leadership on contrasting genders in four different economies namely; India, Canada, Pakistan, and United Kingdom’s IT Sector. By combining probability and non-probability sampling techniques, the data has been gathered from 248 respondents via semi-structured 5-points scale survey questionnaire. The findings have shown that employees irrespective gender are significant positively affected by feminine leadership style. Additionally, in developing countries; Pakistan and India there is significant use of feminine leadership while developed economies namely; Canada and the UK have higher preference for masculine leadership style. Nevertheless, overall male workers do not have higher preference to work under masculine leadership style while females have higher preference for both masculine and feminine leadership styles. Interestingly, feminine style of leadership is highly demonstrated by males in Pakistan while in other three economies, it is exhibited by female line-managers. Moreover, female line-managers in the UK have shown higher masculine style of leadership in contrast to other economies. There is significant positive relationship between style of leadership and contrasting genders in distinctive economies. Additionally, feminine leadership style is more effective than the masculine leadership style. Feminine leaders demonstrate higher people-orientation and participative style of management whereas masculine leaders rely on task-orientation and autocratic style.
    Artykuł koncentruje się na wpływie i skuteczności kobiecych i męskich stylów przywództwa w czterech różnych gospodarkach, a mianowicie sektorze IT w Indiach, Kanadzie, Pakistanie i Wielkiej Brytanii. Łącząc techniki próbkowania z doborem losowym i nielosowym, dane zebrano od 248 respondentów za pomocą półstrukturyzowanego 5-punktowego kwestionariusza ankiety. Ustalenia wykazały, że pracownicy bez względu na płeć pozostają pod znacznym pozytywnym wpływem stylu kobiecego przywództwa. W krajach rozwijających się - w Pakistanie i Indiach aktywnie wykorzystuje się kobiece przywództwo, podczas gdy w gospodarkach rozwiniętych, w Kanadzie i Wielkiej Brytanii preferuje się męski styl przywództwa. Co ciekawe, badanie wykazało, że kobiecy styl przywództwa jest wysoce popierany przez mężczyzn w Pakistanie, podczas gdy w innych trzech gospodarkach jest demonstrowany przez kobiecych menedżerów linii. Co więcej, menedżerowie liniowi w Wielkiej Brytanii, jako dominujący, wykazali męski styl przywództwa w przeciwieństwie do innych gospodarek. Istnieje wyraźna pozytywna zależność między stylem przywództwa a płcią w odróżniających się gospodarkach. Ponadto kobiecy styl przywództwa jest bardziej skuteczny niż męski. Kobiety, jako przywódcy demonstrują wyższy orientacyjny i partycypacyjny styl zarządzania, podczas gdy męscy liderzy polegają na stylu zadaniowym i autokratycznym.
    Źródło:
    Polish Journal of Management Studies; 2018, 17, 1; 78-92
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of phytoplankton size-structure based productivity, pigment complexes (HPLC/CHEMTAX) and species composition in the Cochin estuary (Southwest coast of India): special emphasis on diatoms
    Autorzy:
    Paul, M.
    Valappan, M.N.
    Nanappan, U.
    Gopinath, V.
    Velloth, R.T.
    Rajendran, A.
    Nair, M.
    Peariya, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078766.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton
    size structure
    photopigment
    species composition
    diatom
    chlorophyll a
    primary production
    seasonality
    high performance liquid chromatography
    chemotaxonomy
    India
    Opis:
    Seasonal studies on size-fractionated phytoplankton productivity (biomass and primary production), marker pigments, and species composition and abundance were carried out in the Cochin estuary (CE), located on the southwest coast of India, to identify the critical environmental factors that control the consistent preponderance of diatoms. The overall results of the study showed a significant contribution of small-sized phytoplankton, specifically nanophytoplankton (2—20 μm), to the total chlorophyll a and primary production in the estuary, regardless of seasons. Diatoms constituted the major phytoplankton taxa, showed an exceptional seasonal scale increase in numerical abundance during the post-southwest monsoon. The relative increase in fucoxanthin (biomarker of diatoms) over other marker pigments substantiated the numerical dominance of diatoms throughout the sampling periods. This is the first study in the CE in which phytoplankton marker pigments have been detected and elucidated the seasonality of functional groups based on HPLC/chemotaxonomy analytical approaches. The prevalence of high DiatDP and diatom chlorophyll a equivalent (estimated by CHEMTAX), further confirmed the preponderance of diatoms in the CE, despite the intermittent dominance of cyanophytes and cryptophytes (monsoon period). The consistent increase in SPM levels (> 25 mg L—1), established at all sampling stations, indicated that the water column turbidity might be one of the significant environmental factors hindering the growth of large-sized phytoplankton (ca. >20 μm) in the CE even if the system invariably holds high inorganic nutrients, irrespective of seasons
    Źródło:
    Oceanologia; 2021, 63, 4; 463-481
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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