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    Wyświetlanie 1-19 z 19
    Tytuł:
    Effects of inertia in the steady state pressurised flow of a non-Newtonian fluid between two curvilinear surfaces of revolution: Rabinowitsch fluid model
    Autorzy:
    Singh, U. P.
    Gupta, R.S.
    Kapur, V.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/185617.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efekt bezwładności
    łożysko krzywoliniowe
    zewnętrzny przepływ ciśnieniowy
    curvilinear bearings
    Rabinowitsch fluid model
    inertia effect
    externally pressurized flow
    Opis:
    In many practical situations fluids are normally blended with additives (viscosity index improvers, viscosity thickeners, viscosity thinners) due to which they show pseudoplastic and dilatant nature which can be modelled as cubic stress model (Rabinowitsch model). The cubic stress model for pseudoplastic fluids is adopted because Wada and Hayashi have shown that the theoretical results with this model are in good agreement with the experimental results. The present theoretical analysis is to investigate the pseudoplastic effect along with the effect of rotational inertia on the pressure distribution, frictional torque and fluid flow rate of externally pressurised flow in narrow clearance between two curvilinear surfaces of revolution. The expression for pressure has been derived using energy integral approach. To analyse and discuss the effects of pseudoplasticity and fluid inertia on the pressure distribution, fluid flow rate and frictional torque, the examples of externally pressurised flow in the clearance between parallel disks and concentric spherical surfaces have been considered.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 333-349
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of Safety and Health in the Tea Industry of Barak Valley, Assam: A Fuzzy Logic Approach
    Autorzy:
    Gupta, R.
    Dey, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/90279.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    vagueness
    fuzziness
    safety
    fuzzy set
    model rozmyty
    system bezpieczeństwa
    ochrona zdrowia
    Opis:
    Traditional safety and health system measurement procedures, practiced in various industries produce qualitative results with a degree of uncertainty. This paper presents a fuzzy-logic-based approach to developing a fuzzy model for assessing the safety and health status in the tea industry. For this, the overall safety and health status at a tea estate has been considered as a function of 4 inputs: occupational safety, occupational health, behavioral safety and competency. A set of fuzzy rules based on expert human judgment has been used to correlate different fuzzy inputs and output. Fuzzy set operations are used to calculate the safety and health status of the tea industry. Application of the developed model at a tea estate showed that the safety and health status belongs to the fuzzy class of good with a crisp value of 7.2.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 4; 613-621
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal LQR controller in CSC based STATCOM using GA and PSO
    Autorzy:
    Gupta, S.
    Tripathi, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/140927.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CSC
    FACTS
    AI techniques
    LQR
    STATCOM
    Opis:
    The static synchronous compensator (STATCOM) is the multipurpose FACTS device with the multiple input and multiple output system for the enhancement of its dynamic performance in power system. Based on artificial intelligence (AI) optimization technique, a novel controller is proposed for CSC based STATCOM. In this paper, the CSC based STATCOM is controlled by the LQR. But the best constant values for LQR controller's parameters are obtained laboriously through trial and error method, although time consuming. So the goal of this paper is to investigate the ability of AI techniques such as genetic algorithm (GA) and particle swarm optimization (PSO) methods to search the best values of LQR controller's parameters in a very short time with the desired criterion for the test system. Performances of the GA, PSO & ABC based LQR controllers are also compared. Applicability of the proposed scheme is demonstrated through simulation in MATLAB and the simulation results are shown an improvement in the input-output response of CSC-STATCOM.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 3; 469-487
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of novel plant-based adjuvant formulation against rubella and hepatitis B vaccine antigen
    Opracowanie nowego adiuwantu roślinnego przeciwko antygenom szczepionki przeciw różyczce i wirusowemu zapaleniu wątroby typu B
    Autorzy:
    Gupta, A.
    Chaphalkar, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/71370.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Opis:
    Introduction: Numerous metabolites present in the aqueous extract from plants are responsible for inducing adjuvant activity against rubella and hepatitis B vaccine antigen (HBsAg). One of the medicinal plants, Adhatoda vasica has been pointed out with great potential of vaccine adjuvant property. Objective: The objective of our study is to evaluate the adjuvant potential of aqueous leaves extract of Adhatoda vasica against rubella and hepatitis B vaccine antigen (HBsAg). Methods: For these studies, our group evaluated the antibody (IgG) titre of HBsAg and rubella vaccine antigen using variable doses (0.625–5 mg) of aqueous leaves extract of Adhatoda vasica and also determined the lymphocyte (splenocyte) proliferation assay (0.625–5 mg; 50 µl) in mice model studies ex vivo (i.e. immunized with HBsAg subcutaneously). Results: The results showed that aqueous leaves extract showed anti-HBsAg and anti-rubella titre and also enhanced the lymphocyte proliferation assay at higher doses (5 mg) as compared to control. Conclusion: Aqueous leaves extract of Adhatoda vasica showed adjuvant activity against HBsAg and rubella vaccine antigen.
    Wstęp: Wiele metabolitów obecnych w wyciągach wodnych z roślin jest odpowiedzialnych za indukcję adiuwantowej aktywności przeciwko antygenom szczepionek przeciw różyczce i wirusowemu zapaleniu wątroby typu B (HBsAg). Jedna z roślin leczniczych, Adhatoda vasica ma duży potencjał adiuwacyjny w szczepionce. Cel: Celem naszej pracy była ocena możliwości adiuwacyjnych wyciągu wodnego z liści Adhatoda vasica przeciwko antygenowi szczepionki przeciwko różyczce i wirusowemu zapaleniu wątroby typu B (HBsAg). Metody: Na użytek badań nasza grupa oceniła miano przeciwciała (IgG) HBsAg i antygenu szczepionki przeciwko różyczce przy pomocy różnych dawek (0,625–5 mg) wyciągu wodnego z liści Adhatoda vasica, a także określiła proliferację limfocytów (splenocytów) (0,625–5 mg; 50 µl) w modelu mysim ex vivo (tj. immunizowanych przez podawanie podskórne HBsAg). Wyniki: Na podstawie otrzymanych wyników wykazano, że wyciąg wodny z liści wpływał na miano przeciw HBsAg i przeciwróżyczkowe, a także w wyższych dawkach (5 mg) wzmacniał proliferację limfocytów w porównaniu do grupy kontrolnej. Wniosek: Wyciąg wodny z liści Adhatoda vasica wykazał działanie adiuwacyjne przeciwko antygenowi HBsAg i antygenowi szczepionki przeciwko różyczce.
    Źródło:
    Herba Polonica; 2016, 62, 3
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow behavior in weakly permeable micro-tube with varying viscosity near the wall
    Autorzy:
    Gupta, R. R.
    Kumar, V.
    Chand, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779656.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    hollow-fiber
    micro-tube
    permeation
    algorithm
    variable viscosity
    velocity profile
    equation of motion
    navier-stokes equation
    Opis:
    Weakly permeable micro-tubes are employed in many applications involving heat and/or mass transfer. During these processes, either solute concentration builds up (mass transfer) or steep change in temperature (heat transfer) takes place near the permeable wall causing a change in the viscosity of the fluid. Results of the present work suggest that such change in viscosity leads to a considerable alteration in the flow behavior, and the commonly assumed parabolic velocity profile no longer exists. To solve the problem numerically, the equation of motion was simplified to represent permeation of incompressible, Newtonian fluid with changing viscosity through a micro-tube. Even after considerable simplification, the accuracy of the results was the same as that obtained by previously reported results for some specific cases using rigorous formulation. The algorithm developed in the present work is found to be numerically robust and simple so that it can be easily integrated with other simulations.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 4; 16-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Field Theory of Magnetic Behaviour of Er$\text{}_{2}$(SO$\text{}_{4}$)$\text{}_{3}$·8H$\text{}_{2}$O
    Autorzy:
    Gupta, R.
    Ghosh, U. S.
    Basu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945413.pdf
    Data publikacji:
    1996-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ch
    75.10.Dg
    Opis:
    Using the most rigorous approach of direct diagonalization of the Hamiltonian matrix constructed in the complete basis states (364 in number) of the Er$\text{}^{3+}$ ion the observed magnetic susceptibility and anisotropy data of erbium sulphate octahydrate were simulated and the set of crystal field parameters was evaluated. This procedure automatically includes the effect of intermediate coupling and the J-mixing under the crystal field. It was also demonstrated that such rigorous calculation using complete basis states is necessary in order to evaluate the correct set of parameters which may widely differ from the values obtained from approximate calculations previously performed using partial number of basis states of the ion concerned.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 5-6; 649-655
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cytogenetic diversity of Elsholtzia ciliata Benth. (Lamiaceae) from Kashmir Himalaya
    Autorzy:
    Malik, R.A.
    Gupta, R.C.
    Kumari, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/19559.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Our cytomorphological study of various populations of Elsholtzia ciliata (Lamiaceae) collected from high-altitude sites of Kashmir Himalaya revealed two euploid cytomorphotypes, diploid (n=8) and tetraploid (n=16), growing sympatrically but inhabiting two different habitats. This is the first report of tetraploid (4×) E. ciliata from the Indian subcontinent. We found the course of meiois to be normal in diploids, but tetraploid individuals showed chromosome and meiotic irregularities: cytomixis at early prophase I, stickiness at metaphase I, and chromosome bridges at anaphase I. In tetraploids, 23 of the 26 pollen mother cells observed at metaphase I showed 0–6 quadrivalents, suggesting that the tetraploid is a segmental allopolyploid. Microsporogenesis was also abnormal in tetraploids, showing the formation of triads. All these anomalies are conducive to lower reproductive potential (40.70%) in tetraploids than in diploids (90.50%). Significant morphological differences between the two cytotypes are presented.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2012, 54, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meiotic studies in some members of Caryophyllaceae Juss. from the Western Himalayas
    Autorzy:
    Jeelani, S.M.
    Rani, S.
    Kumar, S.
    Kumari, S.
    Gupta, R.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/19318.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Caryophyllaceae
    Himalayas
    meiotic process
    chromosome number
    meiosis
    Western Himalayas
    pollen grain size
    Arenaria kashmirica
    Silene conoidea
    Silene edgeworthii
    Silene moorcroftiana
    Silene nepalensis
    Stellaria media
    Stellaria monosperma
    Stellaria semivestita
    Lychnis coronaria
    Silene vulgaris
    India
    Gypsophilla ceratioides
    Opis:
    The paper reports meiotic studies on 50 populations comprising 12 species belonging to 5 genera of Caryophyllaceae from the Western Himalayas. The chromosome numbers in Arenaria kashmirica (n=20), Silene conoidea (n=20), S. edgeworthii (n=12 and n=24), S. moorcroftiana (n=24), S. nepalensis (n=12), Stellaria media (n=13), S. monosperma (n=13) and S. semivestita (n=13) are reported for the first time. The chromosome numbers in Lychnis coronaria (n=12) and Silene vulgaris (n=24) are given for the first time from India, along with Gypsophilla ceratioides (n=15) from the Western Himalayas. The course of meiosis varies from normal to abnormal in different populations of Silene conoidea, S. edgeworthii, S. vulgaris, Stellaria media, S. monosperma and S. semivestita. The course of meiosis was abnormal in all studied populations of Lychnis coronaria. Abnormal microsporogenesis (cytomixis, chromosomal stickiness, unoriented bivalents, formation of laggards and bridges) led to reduced pollen fertility and differences in pollen grain size.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perception of dental practitioners regarding the use of antioxidants in oral health
    Autorzy:
    Randhawa, R.K.
    Gupta, N.
    Bansal, M.
    Arora, V.
    Gupta, P.
    Thakar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/875829.pdf
    Data publikacji:
    2016
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    perception
    dental health
    antioxidant
    free radical
    mouth cancer
    oral health
    Opis:
    Background. Free radicals play a key role in the development of several pathological conditions. Therefore, antioxidants (AOs) are the first line of defense against free radical damage and are critical for maintaining optimum health and wellbeing. Objectives: To assess the perception of dental practitioners regarding use of antioxidants in oral health. Method. A cross-sectional questionnaire study was conducted among 296 dental practitioners in Tricity (Chandigarh, Mohali, Panchkula, India). A self-structured close-ended questionnaire was used to assess the perception of dentists regarding the use of antioxidants in their patients. It consisted of 12 questions with dichotomous response and five point likert scale ranging from strongly agree to strongly disagree. Descriptive statistics were used to summarize the data, followed by the Chi-square test to check significant differences between the responses. Correlation between responses were analysed through the Spearman’s rank correlation. Statistical analysis was done using Statistical Package for Social Sciences version 20 (Illinois, Chicago, USA). Results. A statistically significant difference was observed between genders, with females 181 (61%) having more knowledge than males 115 (39%) regarding the use of antioxidants in their clinical practice. It has been found that dental professionals in academics prescribes more antioxidants to their patients than the private practitioners. Postgraduates 76 (77.6%) had a higher level of knowledge than graduates 86 (43%). Conclusions. Knowledge about antioxidants should be highlighted in the health sciences curriculum. It is recommended to expand the use of antioxidants in oral health to bring down the burden of chronic diseases like periodontitis and catastrophic diseases like precancerous lesions and oral cancer.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2016, 67, 3
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromosome numbers and basic chromosome numbers in monocotyledonous genera of the Western Himalayas (India)
    Autorzy:
    Kaur, H.
    Mubarik, N.
    Kumari, S.
    Gupta, R.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/19329.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2014, 56, 2
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Omicron sub-variants: is the world going to witness another wave?
    Autorzy:
    Aggarwal, A.
    Nirola, A.
    Singh, R.
    Goel, R.
    Gupta, A.
    Gambhir, R.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/28765575.pdf
    Data publikacji:
    2022
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Opis:
    Omicron, the new ‘Variant of Concern’ of SARS-CoV-2, is rapidly evolving into new sub-variants or sub-lineages (BA.1, BA.2 etc.). These sub-variants have higher transmissibility, decreased vaccine effectiveness and increased risk of reinfection. As a result, many nations across the globe are reporting surge in infections which is a matter of concern. Understanding Omicron and its sub-variants is vital for development of public health policy and preventing disease transmission. The present paper throws a spotlight on the newly detected sub-variants of Omicron as reported in ongoing researches which are available only in pre-print form and also the importance of a booster dose of the vaccine. Information regarding recent research on a new nasal vaccine formulation, which may be effective against the new variants, is also highlighted in the paper.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2022, 73, 2; 159-162
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Endodontic treatment of immature tooth - a challenge
    Autorzy:
    Gupta, S.
    Sodhi, S.P..
    Brar, G.K.
    Bansal, R.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2097446.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    mmature tooth
    root apex
    endodontic treatment
    open apex
    MTA
    regenerative endodontics
    Opis:
    Root apex is an area of primary importance for an endodontist. When a tooth erupts in the oral cavity the apical foramen undergoes anatomical changes with age. Root development is completed and the root apex is closed three years after eruption of the tooth. Endodontic practice is influenced to a great extent by different stages of root development and the type of tissue present within the roots. Open apices pose a challenging problem for the success of root canal treatment because they favour the extravasation of the irrigating solution and/or sealer into periradicular tissues, thus jeopardizing apical healing. Regenerative endodontics (revascularization/pulpal regeneration) is a straightforward approach accomplished with currently available instruments and materials. A literature review suggests that Mineral Tri oxide Aggregate (MTA) is the most favourable and recommendable material for single-visit apexification, even in cases when regenerative endodontics cannot be performed. A plus point of MTA is its biocompatibility and hermetic apical seal with no micro-leakage. It should be considered as an effective alternate for treating immature teeth with necrotic pulps. Treatment of a tooth with open apex poses multiple challenges. However, it is not easy to decide which material should be used: Calcium hydroxide, Mineral Tri oxide Aggregate, Biodentine, Platlet Rich Fibrin (PRF), or White Portland Cement (WPC). The choice of treatment regimen depends on several factors, e.g. individual cases, experience of the operator, familiarity with handling various materials, and patient’s availability for follow-up appointments. This review highlights various challenges in the treatment of open apex, with emphasis on MTA compared with other materials.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2020, 14, 3; 73-79
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ashwagandha (Withania somnifera) – a herb with versatile medicinal properties empowering human physical and mental health
    Autorzy:
    Gupta, S.
    Bansal, R.N.
    Sodhi, S.P.S.
    Brar, G.K.
    Molhotra, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2098530.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    ashwagandha
    Withania somnifera
    herb
    medicinal property
    empowerment
    physical health
    mental health
    Opis:
    Introduction. Ashwagandha is a rasayana of Ayurveda system of medicines. It is a real potent regenerative tonic possessing several pharmacological properties like neuro-protective, anti-stress, anti-arthritic, antitumor, analgesic and anti-inflammatory. Objective. To illustrate applications and limitations of Ashwagandha in detail. Materials and method. Data was collected from various review and research publications. Literature review involved animal studies and human studies. Emphasis was given on versatility of medicinal properties. Results. Ashwagandha plays an important role in improving quality of life and performance at work and possess several pharmacologic actions. Each part of this herb i.e. from root to fruit possess medicinal properties. Conclusions. Ashwagandha possesses wide variety of therapeutic uses in each and every system of human body. The plant has also been widely studied for its various pharmacological activities like antioxidant, anxiolytic, adaptogen, memory enhancing, antiparkinsonian, antiinflammatory, antitumor properties. Irrespective of such large network of benefits this herb has some limitations of use in certain situations.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2021, 15, 3; 129-133
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative evaluation of inversion approaches of the radiative transfer model for estimation of crop biophysical parameters
    Autorzy:
    Mridha, N.
    Sahoo, R.N.
    Sehgal, V.K.
    Krishna, G.
    Pargal, S.
    Pradhan, S.
    Gupta, V.K.
    Nagesh Kumar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/25984.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    The inversion of canopy reflectance models is widely used for the retrieval of vegetation properties from remote sensing. This study evaluates the retrieval of soybean biophysical variables of leaf area index, leaf chlorophyll content, canopy chlorophyll content, and equivalent leaf water thickness from proximal reflectance data integrated broad bands corresponding to moderate resolution imaging spectroradiometer, thematic mapper, and linear imaging self scanning sensors through inversion of the canopy radiative transfer model, PROSAIL. Three different inversion approaches namely the look-up table, genetic algorithm, and artificial neural network were used and performances were evaluated. Application of the genetic algorithm for crop parameter retrieval is a new attempt among the variety of optimization problems in remote sensing which have been successfully demonstrated in the present study. Its performance was as good as that of the look-up table approach and the artificial neural network was a poor performer. The general order of estimation accuracy for para-meters irrespective of inversion approaches was leaf area index > canopy chlorophyll content > leaf chlorophyll content > equivalentleaf water thickness. Performance of inversion was comparable for broadband reflectances of all three sensors in the optical region with insignificant differences in estimation accuracy among them.
    Źródło:
    International Agrophysics; 2015, 29, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An extension of line spring model for vibration analysis of thin isotropic plate containing multiple part-through cracks: an analytical approach
    Autorzy:
    Jain, N. K.
    Gupta, A.
    Salhotra, R.
    Rawani, A. M.
    Soni, S.
    Mishra, A.
    Joshi, P. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/128046.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    multiple cracks
    Line Spring Model
    vibration
    partial crack
    pęknięcie wielokrotne
    sprężyna liniowa
    drgania
    pęknięcie częściowe
    Opis:
    In the present study, the effect of multiple part-through cracks on the vibration characteristics of thin isotropic rectangular plate is presented. The proposed analytical model is developed using Kirchhoff’s classical plate theory and the crack terms are formulated using the simplified Line Spring Model (LSM). The application of Berger's formulation helps to transform the derived governing equation in the form of well known Duffing equation with cubic nonlinearities and then the solution for final governing equation is obtained using Galerkin's method for two different boundary conditions. The fundamental frequency of the plate as affected by the number of cracks, cracks length, cracks orientation, and plate aspect ratio for different boundary condition is presented. It is found that the results obtained for natural frequencies are maximally affected by number of cracks, crack length and orientations.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-25
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated biostratigraphy of the Jurassic strata of the Wagad Uplift, Kachchh, western India
    Autorzy:
    Rai, J.
    Garg, S.
    Gupta, M.
    Singh, A.
    Pandey, D. K.
    Fürsich, F. T.
    Alberti, M.
    Garg, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077328.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Jurassic
    calcareous nannofossils
    dinoflagellate cysts
    ammonites
    Oxfordian
    Kimmeridgian
    Wagad Uplift
    Kachchh
    jura
    wapienie
    bruzdnice
    amonity
    Oksford
    Kimeryd
    Opis:
    An integrated study based on calcareous nannofossils, organic-walled dinoflagellate cysts, and ammonites from the Washtawa and Kanthkot formations of the Wagad Uplift have allowed a detailed documentation of the stratigraphic position of these formations within the Oxfordian and Kimmeridgian sediments of the Kachchh Basin, western India. The nannofossil assemblages from the lower part of the Nara Shale Member exposed in the Nara and Washtawa domes, the Kanthkot Ammonite Beds along the Trambau River section, and the Patasar Shale Member exposed along the Trambau River section and the Patasar Tank section in the eastern part of the Wagad Uplift belong to the NJ 14 Cyclagelosphaera margerelli Zone of the Early Oxfordian, the NJ 15a Lotharingius sigillatus Zone of the Middle Oxfordian, and the NJ 15b Cretarhabdus conicus of Early Kimmeridgian age, respectively. Zonation schemes, based on calcareous nannofossils, dinoflagellate cysts, and ammonites were calibrated highlighting their biostratigraphic potential. These studies may represent a reference biochronology for Oxfordian–Kimmeridgian age strata applicable to the Tethyan realm of which India was a part during Late Jurassic times.
    Źródło:
    Volumina Jurassica; 2015, 13, 2; 55--80
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chitosan biopolymer improves the fruit quality of litchi (Litchi chinensis Sonn.)
    Biopolimer chitozan poprawia jakość owoców liczi (Litchi chinensis Sonn.)
    Autorzy:
    Mehebub, Md.S.
    Mahmud, N.U.
    Rahman, M.
    Surovy, M.Z.
    Gupta, D.R.
    Hasanuzzaman, M.
    Islam, M.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/26717.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Chitosan (CHT) is a natural compound that has been used to control postharvest pathogenic diseases due to its capability of eliciting natural defense responses in plants. The aim of this study was to investigate the effect of foliar CHT application on yield and quality of the litchi fruit. Chitosan was applied by spraying on to fruit and foliage just after fruit set four times at 7-day intervals with four varying doses viz. 100, 250, 500, and 1,000 µg L−1 and a control (0 µg L−1). Although the application of CHT had no significant effect on the size of the fruits (length and width), the total contents of phenolics, flavonoids, and ascorbic acid and the antioxidant activity of litchi fruit arils were significantly increased in CHT-treated fruit compared with the untreated control. The highest phenolic, flavonoid, and ascorbic acid contents were 334 µg gallic acid g−1, 881 μg quercetin g−1, and 178 µg g−1, respectively, in fruits treated with 500 µg L−1 CHT. However, the highest antioxidant activity (622 μg butylated hydroxytoluene g−1) was recorded in 250 µg L−1 CHT-treated fruits. Our findings revealed that the application of low doses of CHT in a litchi orchard might improve fruit quality by increasing the content of antioxidants and antioxidant activities.
    Chitozan (CHT) jest naturalnym związkiem wykorzystywanym do zwalczania chorób roślin, ponieważ wykazuje potencjał do wywoływania naturalnej odpowiedzi obronnej w roślinach. Celem niniejszych badań było określenie wpływu dolistnego aplikowania CHT na plonowanie i jakość owoców liczi. Chitozan w stężeniu: 0 (kontrola), 100, 250, 500 lub 1000 μg L−1 rozpylano na owoce i liście bezpośrednio po pojawieniu się owoców czterokrotnie w odstępach 7-dnio-wych. Mimo, że aplikacja CHT nie miała istotnego wpływu na wielkość owoców (długość i szerokość), całkowita zawartość związków fenolowych, flawonoidów i kwasu askorbiowego, jak również aktywność antyoksydacyjna owoców liczi wyraźnie wzrosła po zastosowaniu CHT w porównaniu do owoców nie poddanych działaniu tego związku. Najwyższe stężenia związków fenolowych, flawonoidów i kwasu askorbinowego, wynoszące odpowiednio: ekwiwalent 334 μg kwasu galusowego g−1 , ekwiwalent 881 μg kwercytyny g−1 i 178 μg g−1, stwierdzono w owocach traktowanych 500 μg L−1 CHT. Jednak najwyższą aktywność antyrodnikową (622 μg butylohy-droksytoluenu g−1) stwierdzono w owocach traktowanych 250 μg L−1 CHT. Uzyskane wyniki wskazują, że zastosowanie niskich stężeń CHT w sadach liczi może poprawić jakość owoców poprzez zwiększenie w nich zawartości antyoksydantów oraz aktywności antyrodnikowej.
    Źródło:
    Acta Agrobotanica; 2019, 72, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-19 z 19

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