Autor: Singh, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of SQL Injection Detection Techniques
Autorzy:: Singh, J. P.
Powiązania:: https://bibliotekanauki.pl/articles/375681.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: SQL Injection
runtime monitoring
Static Analysis
Opis:: SQL Injection is one of the vulnerabilities in OWASP's Top Ten List forWeb Based Application Exploitation. These type of attacks take place on Dynamic Web applications as they interact with databases for various operations. Current Content Management System like Drupal, Joomla or Wordpress have all information stored in their databases. A single intrusion into these type of websites can lead to overall control of websites by an attacker. Researchers are aware of basic SQL Injection attacks, but there are numerous SQL Injection attacks which are yet to be prevented and detected. Over here, we present the extensive review for the Advanced SQL Injection attack such as Fast Flux SQL Injection, Compounded SQL Injection and Deep Blind SQL Injection. We also analyze the detection and prevention using the classical methods as well as modern approaches. We will be discussing the Comparative Evaluation for prevention of SQL Injection.
Źródło:: Theoretical and Applied Informatics; 2016, 28, 1-2; 37-55
1896-5334
Pojawia się w:: Theoretical and Applied Informatics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: On the degree of approximation of an entire function
Autorzy:: Singh, J. P.
Powiązania:: https://bibliotekanauki.pl/articles/745136.pdf
Data publikacji:: 1976
Wydawca:: Polskie Towarzystwo Matematyczne
Opis:: The article contains no abstract
Źródło:: Commentationes Mathematicae; 1976, 19, 1
0373-8299
Pojawia się w:: Commentationes Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Optimal design of RC frames using a modified hybrid PSOGSA algorithm
Optymalny projekt ramy RC z wykorzystaniem zmodyfikowanego algorytmu hybrydowego PSOGSA
Autorzy:: Chutani, S.
Singh, J.
Powiązania:: https://bibliotekanauki.pl/articles/230376.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: projekt optymalny
konstrukcja żelbetowa
optymalizacja demokratyczna roju cząstek
samoadaptacyjny algorytm
grawitacyjnego wyszukiwania
projektowanie
Indie
norma indyjska
optimum design
reinforced concrete structure
democratic particle swarm optimization
selfadaptive gravitational search algorithm
design
Indian standard
Opis:: The present study has been taken up to emphasize the role of the hybridization process for optimizing a given reinforced concrete (RC) frame. Although various primary techniques have been hybrid in the past with varying degree of success, the effect of hybridization of enhanced versions of standard optimization techniques has found little attention. The focus of the current study is to see if it is possible to maintain and carry the positive effects of enhanced versions of two different techniques while using their hybrid algorithms. For this purpose, enhanced versions of standard particle swarm optimization (PSO) and a standard gravitational search algorithm (GSA), were considered for optimizing an RC frame. The enhanced version of PSO involves its democratization by considering all good and bad experiences of the particles, whereas the enhanced version of the GSA is made self-adaptive by considering a specific range for certain parameters, like the gravitational constant and a set of agents with the best fitness values. The optimization process, being iterative in nature, has been coded in C++. The analysis and design procedure is based on the specifications of Indian codes. Two distinct advantages of enhanced versions of standard PSO and GSA, namely, better capability to escape from local optima and a faster convergence rate, have been tested for the hybrid algorithm. The entire formulation for optimal cost design of a frame includes the cost of beams and columns. The variables of each element of structural frame have been considered as continuous and rounded off appropriately to consider practical limitations. An example has also been considered to emphasize the validity of this optimum design procedure.
W niniejszym artykule przedstawiono bardziej realistyczny i optymalny projekt żlbetowych ram konstrukcyjnych (RC) poprzez hybrydyzację ulepszonych wersji standardowej optymalizacji roju cząsteczek (PSO) oraz standardowy algorytm wyszukiwania grawitacyjnego (GSA). Podejście proponowane w niniejszej pracy koncentruje się na hybrydyzacji ulepszonych wersji standardowej optymalizacji roju cząsteczek (PSO) oraz standardowym algorytmie wyszukiwania grawitacyjnego (GSA). PSO została zdemokratyzowana poprzez uwzględnienie wszystkich dobrych i złych doświadczeń w zakresie cząsteczek, podczas gdy GSA został zmieniony na samodostosowujący, uwzględniając określony zakres dla niektórych parametrów, takich jak np. stała grawitacyjna i zestaw czynników o najlepszych wartościach sprawności. Optymalny rozmiar i wzmocnienie elementów zostały określone dzięki zastosowaniu techniki w środowisku komputerowym, w którym cały proces analizy, projektowania i optymalizacji został zakodowany w C++. Procedura analizy i projektowania przebiega zgodnie ze specyfikacjami kodów indyjskich. Okazało się, że zastosowanie samodostosowującego algorytmu wyszukiwania grawitacyjnego wraz z demokratyczną techniką optymalizacji roju cząsteczek zapewnia dwie wyraźne przewagi nad standardową PSO i GSA, a mianowicie lepszą zdolność do ucieczki od lokalnej optymalności i szybszy współczynnik konwergencji. Całe sformułowanie dla optymalnego projektu kosztów ramy obejmuje zarówno koszt belek i słupów. W tym podejściu, zmienne każdego elementu ramy konstrukcyjnej zostały uznane za funkcje ciągłe i zaokrąglone odpowiednio do zastosowania praktycznego znaczenia niniejszego badania. Rozważono kilka przykładów, które podkreślają ważność optymalnej procedury projektowania, a wyniki porównano z wcześniejszymi badaniami, w celu sprawdzenia ich skuteczności i efektywności. Proponowany algorytm pokonuje ograniczenia dwóch indywidualnych algorytmów, biorąc pod uwagę ich hybrydę, a tym samym poprawia ogólną wydajność. Wprowadzono niezbędne zmiany, aby badanie było zgodne z wcześniejszymi badaniami. Porównanie z innymi wcześniej stosowanymi technikami hybrydowymi pokazuje, że czas potrzebny na przeprowadzenie procesu optymalizacji w niniejszym badaniu – z wykorzystaniem techniki MPSOGSA – został znacznie zmniejszony. Ponadto, podczas projektowania ram RC obniżono całkowity koszt za pomocą techniki MPSOGSA. Obniżenie kosztów w obszarze stali odgrywa większą rolę w optymalizacji, w porównaniu do redukcji kosztów w przekroju poprzecznym elementów ramy, co zostało szczegółowo przeanalizowane na przykładzie.
Źródło:: Archives of Civil Engineering; 2017, 63, 4; 123-134
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Map construction and localization using Lego Mindstorms NXT
Autorzy:: Singh, J.
Bedi, P.
Powiązania:: https://bibliotekanauki.pl/articles/385248.pdf
Data publikacji:: 2013
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: LEGO Mindstorms NXT
TriBot
ultrasonic sensor
map construction
localization
particle filter
MATLAB
mobile robot
RWTH – Mindstorms NXT
toolbox
Opis:: Maps are very useful for understanding unknown places before visiting them as maps represent spatial relationships between various objects in a region. Using robots for map construction is an important field these days as robots can reach places which may be inaccessible to human beings. This paper presents a method to use the data obtained from a single ultrasonic sensor mounted on a robot, to construct a map and localize the robot within that map. Map of the previously unknown environment is created with the help of a mobile robot, built using Lego Mindstorms NXT assembled in a modified TriBot configuration. The robot is equipped with an ultrasonic sensor and is controlled from a computer system running a MATLAB program, which communicates with the NXT over a USB or Bluetooth connection and performs complex calculations that are not possible for the NXT itself. After the map construction, the robot finds its position in the map by using a particle filter. Implementation has been done in MATLAB programming environment using RWTH – Mindstorms NXT Toolbox and has been successfully tested for map construction of a room and localization within that room with the use of a TriBot.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2013, 7, 3; 22-30
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Two-dimensional deformation in a thermoelastic solid with microtemperatures subjected to an internal heat source
Autorzy:: Ailawalia, P.
Budhiraja, S.
Singh, J.
Powiązania:: https://bibliotekanauki.pl/articles/265902.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: termoelastyczność
źródło ciepła
mikrotemperatura
thermoelasticity
internal heat source
normal mode
microtemperatures
Opis:: The purpose of this paper is to study the two dimensional deformation in a generalized thermoelastic medium with microtemperatures having an internal heat source subjected to a mechanical force. The force is acting along the interface of generalized thermoelastic half space and generalized thermoelastic half space with microtemperatures having an internal heat source. The normal mode analysis has been applied to obtain the exact expressions for the considered variables. The effect of internal heat source and microtemperatures on the above components has been depicted graphically.
Źródło:: International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 5-21
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: On Rayleigh wave in generalized magneto-thermoelastic media with hydrostatic initial stress
Autorzy:: Singh, B.
Kumari, S.
Singh, J.
Powiązania:: https://bibliotekanauki.pl/articles/201293.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: generalized thermoelasticity
hydrostatic initial stress
magnetic field
Rayleigh wave
frequency equation
Opis:: The governing equations of generalized magneto-thermoelasticity with hydrostatic initial stress are solved for surface wave solutions. The particular solutions in the half-space are applied to the boundary conditions at the free surface of the half-space to obtain the frequency equation of Rayleigh wave. The frequency equation is approximated for small thermal coupling and small reduced frequency. The velocity of propagation and amplitude-attenuation factor of Rayleigh wave are computed numerically for a particular material. Effects of magnetic field and hydrostatic initial stress on the velocity of the propagation and amplitude-attenuation factor are shown graphically.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 349-352
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Analytical solution of a fractional model of fluid flow through narrowing system in terms of Mittag-Leffler function
Autorzy:: Choudhary, A.
Kumar, D.
Singh, J.
Powiązania:: https://bibliotekanauki.pl/articles/264897.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: transformata Hankela
funkcja Bessela
pochodna Caputo
narrowing system
generalized Caputo fractional derivative
Sumudu transform
finite Hankel transform
Bessel function
Mittag-Leffler function
Opis:: In this work, we discuss a fractional model of a flow equation in a simple pipeline. Pipeline narrowing is a crucial aspect in drinking water distribution processes, sewage system and in oil-well schemes. The solution of the mathematical model is determined with the aid of the Sumudu transform and finite Hankel transform. The results derived in the current study are in compact and graceful forms in terms of the Mittag-Leffler type function, which are convenient for numerical and theoretical evaluation.
Źródło:: International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 1-11
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis of data aggregation methods and related issues in Wireless Sensor Networks
Autorzy:: Nels, S. Ninisha
Singh, J. Amar Pratap
Powiązania:: https://bibliotekanauki.pl/articles/2050167.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: data aggregation
wireless sensor network
WSN
clustering
cluster head
CH
cluster-based data aggregation
Opis:: Data aggregation is the process aimed at reducing the transmission count of packets being transmitted in the framework of in-network data processing. It is the data transmission model that takes the information transmitted from different nodes and generates a single data packet after finding and eliminating the redundant packets. Accordingly, this process decreases the transmission count and makes it possible to consume less energy. The major issues in data aggregation mechanism are related to reduction of latency and to energy balancing. Moreover, it is very complex to resolve the issue of packet loss, which is the failure of one or more transmitted packets to arrive at their destination due to the bad and/or congested channel conditions. The present survey involves a collection of 50 research papers dealing with the data aggregation models in wireless sensor networks (WSN). Various data aggregation methods, like the cluster-based approach, structure-free method, tree-based approach, in-network methods, and energy based aggregation model are considered in this survey, regarding the application and the energy usage involved. On the basis of the survey, the issues and drawbacks faced by the respective methodologies are highlighted. In addition, the paper presents simple statistics of the studies considered with respect to the performance measures, simulation tools, publication year, and classification of methods. The future dimensions of the respective research are supposed to be based on the challenges identified in this survey.
Źródło:: Control and Cybernetics; 2020, 49, 4; 419-446
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A comprehensive review of renewable energy production from biomass-derived bio-oil
Autorzy:: Sharma, M.
Singh, J.
Baskar, C.
Kumar, A.
Powiązania:: https://bibliotekanauki.pl/articles/80718.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: renewable energy
biomass
bio-oil
bioenergy
biomass source
fast pyrolysis
hydrothermal liquefaction
climate change
energy security
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 2
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Management of sugar industrial wastes through vermitechnology
Autorzy:: Bhat, S.A.
Singh, J.
Vig, A.P.
Powiązania:: https://bibliotekanauki.pl/articles/11795.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:: The present paper discusses the role of earthworms in recycling of sugar industrial wastes. The wastes generated from sugar industry are pressmud, bagasse, bagasse fly ash, sugar cane trash, sugar beet mud, sugar beet pulp, molasses etc. These wastes when mixed with other organic substrates become ideal mixtures for growth of earthworms. These wastes if stored in open field’s causes contamination in the environment and may cause several diseases in public health. But the governments have been unable to tackle the menace of solid waste pollution due to dearth of appropriate technologies, finance and space. Therefore, environment friendly and cost effective technologies for nutrient recycling or remediation of wastes are being advocated as an alternative means for conserving and replenishing natural resources of the ecosystems. Vermicomposting is one such technology that synergises microbial degradation with earthworm’s activity for reducing, reusing and recycling waste materials in a shorter span of time. Earthworm technology can convert sugar industrial wastes into valuable fertilizing material. The final product (vermicompost) produced during the process of vermicomposting is nutrient rich organic fertilizer with plant available nutrients such as nitrogen, potassium, calcium and phosphorus. In the present study an attempt has been made to document the role of earthworms in reuse of sugar industry waste.
Źródło:: International Letters of Natural Sciences; 2016, 55
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Cumulative Sum Control Charts for Truncated Normal Distribution under Measurement Error
Autorzy:: Sankle, R.
Singh, J. R.
Mangal, I. K.
Powiązania:: https://bibliotekanauki.pl/articles/465820.pdf
Data publikacji:: 2012
Wydawca:: Główny Urząd Statystyczny
Tematy:: Truncated Normal Distribution Measurement Error
ARL and CSCC
Opis:: In the present paper Cumulative Sum Control Chart (CSCC) for the truncated normal distribution under measurement error (r) is discussed. The sensitivity of the parameters of the V-Mask and the Average Run Length (ARL) is studied through numerical evaluation for different values of r.
Źródło:: Statistics in Transition new series; 2012, 13, 1; 95-106
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: First report of the earthworm Pontoscolex corethrurus (Müller, 1857) from Punjab, India
Autorzy:: Singh, S.
Singh, J.
Sharma, A.
Pal Vig, A.
Shakoor, A.
Powiązania:: https://bibliotekanauki.pl/articles/11913.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Źródło:: International Letters of Natural Sciences; 2018, 68
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Applications of Some Well-Known Skewed Distributions to Greenhouse Gas Emissions Data
Autorzy:: Shakil, M.
Singh, J. N.
Kibria, B. M. G.
Khadim, A.
Ahsanullah, M.
Powiązania:: https://bibliotekanauki.pl/articles/1839385.pdf
Data publikacji:: 2021
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Goodness of fit test
Greenhouse gas emissions
Probability distributions
Statistical analysis
Opis:: In many problems of transportation and environmental processes and designs, fitting of a continuous probability distribution to the greenhouse gas emissions data from cars may be helpful in predicting the probability or forecasting the frequency of occurrence of the greenhouse gas emissions from burning fossil fuel for our cars, trucks, ships, trains, and planes, and planning beforehand. The objective of this paper is to study and conduct a statistical analysis of the greenhouse gas emissions data from cars. Since our data are skewed in nature, we fit the following well known skewed distributions: 3 parameter Birnbaum-Saunders (or fatigue-life), gamma, 3 parameter gamma, generalized extreme value, 3 parameter lognormal, 4 parameter Pearson 6 and Weibull distributions. We have tested the goodness of fit these distributions to a random sample of the greenhouse gas emissions data from 32 different models of cars to determine their applicability and best fit to these data based on the Kolmogorov-Smirnov, Anderson-Darling, and Chi-Squared Goodness-of-Fit Tests.
Źródło:: World Scientific News; 2021, 162; 1-15
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Intranasal (IN) COVID-19 vaccines - a breakthrough
Autorzy:: Gambhir, R.S.
Kaur, K.
Matariya, R.
Singh, B.
Sood, R.
Singh, J.
Powiązania:: https://bibliotekanauki.pl/articles/28765534.pdf
Data publikacji:: 2023
Wydawca:: Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:: Emerging variants of COVID-19 have threatened the effectiveness of intramuscular (IM) vaccines since that are made to target only the spike protein. Development of Intranasal (IN) vaccination has been proven to provide both the mucosal and systemic immune responses for broader and long lasting protection. Many IN vaccine candidates (virus-vectored vaccines, recombinant subunit vaccines and live attenuated vaccines) are in different phases of clinical trials and in near future many companies would be releasing their vaccines into the drug market. Potential advantages of IN vaccination over IM vaccination makes them ideal to be administered in children and developing populations of the world. This paper focuses on the very recent developments in intranasal vaccination with a spotlight on their safety and efficacy concerns. IN vaccination can prove to be game-changer in handling COVID-19 and potential viral contagious diseases in future.
Źródło:: Roczniki Państwowego Zakładu Higieny; 2023, 74, 1; 15-18
0035-7715
Pojawia się w:: Roczniki Państwowego Zakładu Higieny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Static analysis of functionally graded plate using nonlinear classical plate theory with von-Karman strains
Autorzy:: Singh, S. J.
Harsha, S. P.
Powiązania:: https://bibliotekanauki.pl/articles/265766.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: metoda Naviera
teoria płyt
odkształcenie
functionally graded materials (FGM) plate
Von-Karman strain
nonlinear classical plate theory (NLCPT)
Navier’s method
Opis:: The present study is based on the nonlinear bending analysis of an FGM plate with Von-Karman strain based on the non-linear classical plate theory (NLCPT) with in-plane displacement and moderate rotation. Non-linear bending analysis based on stresses and transverse deflections is then carried out for the plate for the complex solution obtained using an analytical method viz. Navier’s method. The equations of motion and boundary conditions are obtained using the Principle of Minimum Potential Energy (PMPE) method and material property is graded in thickness direction according to simple power-law distribution in terms of volume fractions of the constituents. The effect of the span-to-thickness ratio and FGM exponent on the maximum central deflection and stresses are studied. The results show that the response is transitional with respect to ceramic and metal and the complex solution predicts the real behavior of stresses and deflections in the functionally graded plate. The functionally graded plate is found to be more effective for moderately thick and thick plates, which is inferred by a complex nature of the solution. For FGM plates, the transverse deflection is in-between to that of metal and ceramic rich plates. The complex nature of the solution also gives information about the stress distribution in the thickness direction.
Źródło:: International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 707-726
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Assay of the Insensitive High Explosive 3-Nitro-1,2,4-triazol-5-one (NTO) by Acid-Base Titration
Autorzy:: Nandi, A. K.
Singh, S. K.
Kunjir, G. M.
Singh, J.
Mandal, A. K.
Pandey, R. K.
Powiązania:: https://bibliotekanauki.pl/articles/358351.pdf
Data publikacji:: 2013
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: NTO
purity
acid-base titration
HPLC
quality control
Opis:: The insensitive high explosive 3-nitro-1,2,4-triazol-5-one (NTO) is a weak acid (pKa 3.76) due to the labile N–H bond. The weakly acidic character of this compound is exploited for its assay by aqueous acid-base titration. The NTO sample was dissolved in water and the resultant solution was titrated against 0.07 N NaOH solution using phenolphthalein as indicator. Regular batch samples were assayed by this method and the results were compared with those obtained by the HPLC method. The aqueous acid-base titration method was found to be suitable for the quality control of the product.
Źródło:: Central European Journal of Energetic Materials; 2013, 10, 1; 113-122
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Optimization of Ammonium Sulfamate Nitration for the Preparation of Ammonium Dinitramide
Autorzy:: Mandal, A. K.
Kunjir, G. M.
Singh, J.
Adhav, S. S.
Singh, S. K.
Pandey, R. K.
Bhattacharya, B.
Lakshmi Kantam, M.
Powiązania:: https://bibliotekanauki.pl/articles/358022.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Opis:: The reaction kinetics for the preparation of ammonium dinitramide (ADN) is described. ADN is the ammonium salt of the dinitramide anion, and belongs to the group of inorganic oxidizers, mainly useful for energetic rocket propellant formulations, particularly for underwater applications. It is also a potential candidate to replace ammonium perchlorate (AP), in order to develop chlorine-free, green propellants. At HEMRL, ADN is prepared by the nitration of ammonium sulfamate (AS) using mixed acid, followed by hydrolysis, neutralization with ammonia (g) and rectification using solvent. The nitration of ammonium sulfamate (AS) is carried out at a subzero temperature of -40 ±1 °C. The yield of ADN is reliant on the formation of dinitramidic acid, an intermediate product formed during the hydrolysis step, and its stability is predominantly dependent upon the level of acidity and temperature of the reaction medium. Prior to these kinetics studies, process optimization of the nitration of ammonium sulfamate (AS) was performed and gave the final mole ratio of AS:HNO3:H2SO4. Since the nitration of AS is sensitive to temperature, the rate of reaction was studied at fixed temperatures with variation of time, keeping all of the other parameters, such as vessel volume, agitator speed, feed rate etc., constant. During these studies, predetermined quantities of ammonium sulfamate (AS) and mixed acid were allowed to react at a fixed temperature (-40 ±1 °C) for different reaction periods to generate the concentration profile of AS. Using this concentration profile, the reaction order and reaction rate constant were evaluated. In order to find the effect of temperature on the reaction rate and yield, experiments were conducted at other temperatures such as -30 and -50 °C. In the present studies, it was found that the optimum temperature of nitration is -40 ±1 °C and that the rate of reaction follows a pseudo second order process with rate constant 0.01113 (min-1)•(mol/L)-1. The reaction time evaluated for 55 to 60% conversion is about 70-80 minutes at -40 ±1 °C, based on this kinetics. The activation energy of AS nitration was found to be -4.6 kcal/mol, using the reaction kinetic data based on the temperature dependent rate equation derived from Arrhenius’s law.
Źródło:: Central European Journal of Energetic Materials; 2014, 11, 1; 83-97
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Derivative of generalized quadratic mean function of entire functions defined by Dirichlet series
Autorzy:: Gupta, J. S.
Singh, Manjit
Powiązania:: https://bibliotekanauki.pl/articles/715443.pdf
Data publikacji:: 1973
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:: Annales Polonici Mathematici; 1972-1973, 27, 3; 279-287
0066-2216
Pojawia się w:: Annales Polonici Mathematici
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Response of corrugated interface on incident qSV-wave in monoclinic elastic half-spaces
Autorzy:: Singh, S. S.
Lalvohbika, J.
Powiązania:: https://bibliotekanauki.pl/articles/264383.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: współczynnik odbicia
współczynnik transmisji
prędkość fazowa
qSV and qP-waves
reflection and transmission coefficients
monoclinic medium
corrugated interface
phase velocity
Opis:: This paper is concerned with the problem of reflection and transmission of elastic waves due to an incident plane qSV-wave at a corrugated interface between two dissimilar monoclinic elastic half-spaces. Due to the corrugated nature of the interface, there exist regularly and irregularly reflected and transmitted elastic waves. Using Rayleigh’s method of approximation, the reflection and transmission coefficients of regular and irregular waves are obtained for the first order of approximation. We have found that these coefficients are functions of the angle of incidence, elastic constants, corrugation and the frequency parameter. These coefficients are obtained for a special type of interface, z =dcos py. We have computed these coefficients for a particular model and discussed the effects of corrugation and frequency parameter.
Źródło:: International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 727-750
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Propagation of spherical shock waves in a dusty gas with radiation heat-flux
Propagacja sferycznych fal uderzeniowych w zanieczyszczonym gazie z uwzględnieniem radiacyjnej wymiany ciepła
Autorzy:: Singh, K. K.
Vishwakarma, J. P.
Powiązania:: https://bibliotekanauki.pl/articles/281502.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fale uderzeniowe
radiacyjna wymiana ciepła
shock waves
radiation heat-flux
Opis:: The propagation of spherical shock waves in a dusty gas with radiation heat-flux and exponentially varying density is investigated in the paper. The equilibrium flow conditions are assumed to be maintained, and the radiation is considered to be of a diffusion type for an optically thick grey gas model. The shock wave moves wit h variable velocity and the total energy of the wave is non-constant. Non-similar solutions are obtained, and the effects of variation of the radiation parameter and time are investigated. The effects of an increase in (i) the mass concentration of solid particles in the mixture and (ii) of the ratio of the density of solid particles to the initial density of gas on the flow variables in the region behind the shock are also investigated.
W pracy zajęto się problemem propagacji sferycznych fal uderzeniowych o wykładniczym rozkładzie gęstości w zanieczyszczonym gazie z uwzględnieniem radiacyjnej wymiany ciepła. Założono równowagowe warunki przepływu czynnika, a samą radiację przyjęto typu dyfuzyjnego w modelu optycznie nieprzezroczystego gazu. Fala uderzeniowa przemieszcza się ze zmienną prędkością, a całkowita energia fali również się zmienia. W analizie otrzymano rozwiązania niepodobne przy rozważaniu wpływu czasu i zmienności strumienia radiacji. Zbadano ponadto efekt wzrostu koncentracji masy cząstek stałych zanieczyszczenia oraz stosunku gęstości tych cząstek do początkowej gęstości gazu na parametry przepływu w obszarze bezpośrednio za czołem fali.
Źródło:: Journal of Theoretical and Applied Mechanics; 2007, 45, 4; 801-817
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Fixed points and nonexpansive retracts in locally convex spaces
Autorzy:: Naimpally, S.
Singh, K.
Whitfield, J.
Powiązania:: https://bibliotekanauki.pl/articles/1363611.pdf
Data publikacji:: 1984
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:: Fundamenta Mathematicae; 1984, 120, 1; 63-75
0016-2736
Pojawia się w:: Fundamenta Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:: Optimization of a dual-slot waveguide for a refractive index biosensor
Autorzy:: Sahu, S.
Ali, J.
Singh, G.
Powiązania:: https://bibliotekanauki.pl/articles/173377.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: biosensor
evanescent field
eigenmode
dispersion
Opis:: The present article illustrates the modeling and optimization of a dual-slot waveguide for the application of a refractive index biosensor. The nanometer scale waveguide structure uses the silicon-on-insulator platform for the consideration of higher sensitivity and compactness of a resonator biosensor. The modal analysis is performed using the finite difference method based on full vector eigenmode calculation. The maximum field penetration in the lower index region is found for the quasi-TE mode. The sensitivity is maximized through the optimization of the waveguide dimension by relating effective refractive index with the dispersion of a waveguide. The biosensor showed the maximum calculated sensitivity of 461.327 nm/RIU and a limit-of-detection of 2.601 × 10^–6 RIU (where RIU denotes refractive index unit).
Źródło:: Optica Applicata; 2018, 48, 1; 161-167
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:: Molecular Interaction Study of Binary Mixtures of THF with Methanol and o-Cresol - an Optical and Ultrasonic Study
Autorzy:: Parveen, S.
Singh, S.
Shukla, D.
Singh, K.
Gupta, M.
Shukla, J.
Powiązania:: https://bibliotekanauki.pl/articles/1585019.pdf
Data publikacji:: 2009-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.35.+d
62.60.+v
82.60.Lf
Opis:: The refractive indices, densities and ultrasonic velocities of binary liquid mixtures of tetrahydrofuran (THF) with methanol and o-cresol over the entire composition range have been measured at 293, 303 and 313 K. Refractive index, density and ultrasonic velocity data have been used to evaluate the molar refraction deviation $ΔR_{m}$, deviation in ultrasonic velocity Δu, excess internal pressure $π_{i}^{E}$, excess molar enthalpy $H_{m}^{E}$ and excess free volume $V_{f}^{E}$. The computed results of $ΔR_{m}$, Δu, $π_{i}^{E}$, $H_{m}^{E}$ and $V_{f}^{E}$ were fitted to the Redlich-Kister polynomial equation. These results suggest that specific strong interactions are taking place in THF + o-cresol mixture while dispersive forces seem to be responsible for behaviour of THF + methanol mixture. Further, experimental refractive index and density data of these mixtures were also used to test the validity of the empirical/semi-empirical relations and models for refractive index and density, respectively.
Źródło:: Acta Physica Polonica A; 2009, 116, 6; 1011-1017
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:: Contractors and fixed points
Autorzy:: Singh, S. L.
Whitfield, J. H. M.
Powiązania:: https://bibliotekanauki.pl/articles/727499.pdf
Data publikacji:: 1988
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:: Colloquium Mathematicum; 1988, 55, 2; 219-228
0010-1354
Pojawia się w:: Colloquium Mathematicum
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:: Quasi Locally Connected Spaces and Pseudo Locally Connected Spaces
Autorzy:: Kohli, J.K.
Singh, D.
Tyagi, B. K.
Powiązania:: https://bibliotekanauki.pl/articles/746262.pdf
Data publikacji:: 2010
Wydawca:: Polskie Towarzystwo Matematyczne
Tematy:: almost (quasi, pseudo) locally connected space
regular open set
regular $F_\sigma$-set
$\theta$-open set
$D_\delta$-completely regular space
quasi $\theta$-continuous function
coreflective subcategory
Opis:: Two new generalizations of locally connected spaces called ‘quasi locally connected spaces’ and ‘pseudo locally connected spaces’ are introduced and their basic properties are studied. The class of quasi locally connected spaces properly contains the class of almost locally connected spaces (J. Austral. Math. Soc. 31(1981), 421–428) and is strictly contained in the class of pseudo locally connected spaces which in its turn is properly contained in the class of sum connected spaces (Math. Nachrichten 82(1978), 121-129; Ann. Acad. Sci. Fenn. A I Math. 3(1977), 185–205). Product and subspace theorems for quasi (pseudo) locally connected spaces are discussed. Their preservation under mappings and their interplay with mappings are outlined. Function spaces of quasi (pseudo) locally connected spaces are considered. Change of topology of a quasi (pseudo) locally connected space is considered so that it is simply a locally connected space in the coarser topology. In contradistinction with almost locally connected spaces, quasi (pseudo) locally connected spaces constitute a coreflective subcategory of TOP.
Źródło:: Commentationes Mathematicae; 2010, 50, 2
0373-8299
Pojawia się w:: Commentationes Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:: Between local connectedness and sum connectedness
Autorzy:: Kohli, J.K.
Singh, D.
Tyagi, B.K.
Powiązania:: https://bibliotekanauki.pl/articles/746732.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Matematyczne
Tematy:: Z-locally connected space, almost (quasi, pseudo) locally connected space, sum connected space, regular open set, regular $F_\sigma$-set, $\theta$-open set, cl-supercontinuous function, mono-coreflective subcategory
Opis:: A new generalization of local connectedness called Z-local connectedness is introduced. Basic properties of Z-locally connected spaces are studied and their place in the hierarchy of variants of local connectedness, which already exist in the literature, is elaborated. The class of Z-locally connected spaces lies strictly between the classes of pseudo locally connected spaces (Commentations Math. 50(2)(2010),183-199) and sum connected spaces ($\equiv$ weakly locally connected spaces) (Math. Nachrichten 82(1978), 121-129; Ann. Acad. Sci. Fenn. AI Math. 3(1977), 185-205) and so contains all quasi locally connected spaces which in their turn contain all almost locally connected spaces introduced by Mancuso (J. Austral. Math. Soc. 31(1981), 421-428). Formulations of product and subspace theorems for Z-locally connected spaces are suggested. Their preservation under mappings and their interplay with mappings are discussed. Change of topology of a Z-locally connected space is considered so that it is simply a locally connected space in the coarser topology. It turns out that the full subcategory of Z-locally connected spaces provides another example of a mono-coreflective subcategory of TOP which properly contains all almost locally connected spaces.
Źródło:: Commentationes Mathematicae; 2013, 53, 1
0373-8299
Pojawia się w:: Commentationes Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:: A study on extracellular synthesis of silver nanoparticles from endophytic fungi, isolated from ethanomedicinal plants Curcuma longa and Catharanthus roseus
Autorzy:: Singh, D.
Rathod, V.
Singh, A.K.
Haq, M.U.
Mathew, J.
Kulkarni, P.
Powiązania:: https://bibliotekanauki.pl/articles/11704.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:: Biological method is considered as eco-friendly and reliable process for the synthesis of silver nanoparticles (AgNps) in the field of nanotechnology due to its tremendous applications in various fields. In this study we have isolated a total of twelve endophytic fungi from leaves of Curcuma longa (turmeric) and Catharanthus roseus out of which six endophytic fungi showed their ability to synthesized AgNps from silver nitrate (AgNO3) solution which splits into a positive silver ion (Ag+) and a negative nitrate ion (NO3 -) in order to turn the silver ions into solid silver (Agº). Of the six positive endophytic fungi VRD2 showed good and encouraging results and was identified as Penicillium spinulosum VRD2. UV-Visible Spectroscopy confirms the AgNps showing maximum peak at 425nm implying the bioreduction of AgNO3. Transmission Electron Microscopy (TEM) revealed the particle are spherical and well dispersed without agglomeration size ranging from 25- 30nm.
Źródło:: International Letters of Natural Sciences; 2016, 57
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:: The onset of convection in a rotating multicomponent fluid layer
Autorzy:: Prakash, J.
Singh, V.
Kumar, R.
Kumari, K.
Powiązania:: https://bibliotekanauki.pl/articles/281283.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: multicomponent convection
principle of exchange of stabilities
oscillatory motions
complex growth rate
concentration Rayleigh number
Lewis number
Opis:: The onset of convective instability is analysed in a rotating multicomponent fluid layer in which density depends on n stratifying agents (one of them is heat) having different diffusivities. Two problems have been analysed mathematically. In the first problem, a sufficient condition is derived for the validity of the principle of the exchange of stabilities. Further, when the complement of this condition holds good, oscillatory motions of neutral or growing amplitude can exist, and thus it is important to derive upper bounds for the complex growth rate of such motions when at least one of the bounding surfaces is rigid so that exact solutions of the problem in closed form are not obtainable. Thus, as the second problem, bounds for the complex growth rates are also obtained. Above results are uniformly valid for quite general nature of the bounding surfaces.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 477-488
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:: Physical and chemical properties of flaxseed
Autorzy:: Singh, K.K.
Mridula, D.
Barnwal, P.
Rehal, J.
Powiązania:: https://bibliotekanauki.pl/articles/25570.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:: International Agrophysics; 2012, 26, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:: Sequence optimization of hole-making operations for injection mould using shuffled frog leaping algorithm with modification
Autorzy:: Dalavi, A. M.
Pawar, P. J.
Singh, T. P.
Powiązania:: https://bibliotekanauki.pl/articles/407274.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: hole-making operations
injection mould
shuffled frog leaping algorithm with modification
Opis:: Tool travel and tool switch planning are the two major issues in hole-making operations of industrial part which involves drilling, tapping etc. operations. It is necessary to find the sequence of operations, which minimizes the total non productive time and tool switch time of hole-making operations depending upon the hole location and the tool sequence to be followed. In this work, an attempt is made to reduce total non-productive time and tool switch time of hole-making operations by applying a relatively new algorithm known as shuffled frog leaping with modification for the determination of optimal sequence of operations. In order to validate the developed shuffled frog leaping algorithm with modification, it is applied on six different problems of holes and its obtained results are compared with dynamic programming (DP), ant colony algorithm (ACO), and immune based evolutionary approach (IA). In addition, an application example of injection mould is considered in this work to demonstrate the proposed approach. The result obtained by shuffled frog leaping algorithm with modification is compared with those obtained using ACO, particle swarm optimization (PSO) algorithm and IA. It is observed that the results obtained by shuffled frog leaping algorithm with modification are superior to those obtained using ACO, PSO and IA for the application example presented.
Źródło:: Management and Production Engineering Review; 2018, 9, 3; 71-78
2080-8208
2082-1344
Pojawia się w:: Management and Production Engineering Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 31.

Tytuł:: Evaluating the Use of Renewable Energy and Communal Governance Systems for Climate Change Adaptation
Autorzy:: Ley, Debora
Corsair, H J
Fuss, Sabine
Singh, Chandni
Powiązania:: https://bibliotekanauki.pl/articles/14156628.pdf
Data publikacji:: 2020-02-12
Wydawca:: Wyższa Szkoła Bankowa we Wrocławiu
Tematy:: renewable energy
adaptation
climate
resilience
institutions
governance
Guatemala
Opis:: Aim: Renewable energy (RE) systems can be effective tools for rural communities for meeting goals for development and climate change mitigation and adaptation. RE systems provide small amounts of electricity fostering community development through improved energy access, livelihood opportunities, and improved quality of life. Communities in rural Guatemala are increasingly vulnerable to climate change impacts, due to increasingly extreme weather events. Distributed RE systems can be more effective than connection to national electric grids in providing power if community members have the agency and skill (technical and in governance) to maintain them. The goal was to evaluate the performance of RE systems used in a rural Guatemalan community and the governance system created around it. Design/Research methods: The specific RE systems were evaluated eight years ago; they had performed well especially after Hurricane Stan. Recommendations were made for further performance improvement. This study evaluates the subsequent performance given more intense rains, and the current state of related community governance on the basis of semi-structured interviews. Conclusions/findings: This research highlights the need for enhanced and continuous monitoring and evaluation methods for both energy projects and their supporting institutional structures. Accountability, mediation mechanisms and transparency tools within these institutions can allow more open communication and equitable treatment with agents of power. Originality/value of the article: The article provides original insights for project implementation and policy information. Strong trust bonds are necessary for community resilience in emergencies, and in the well-being and development of the community, independent of energy sources.
Źródło:: Central European Review of Economics and Management; 2020, 4, 1; 53-70
2543-9472
Pojawia się w:: Central European Review of Economics and Management
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:: Anodic oxide films on niobium and tantalum in different aqueous electrolytes and their impedance characteristics
Autorzy:: Verma, N.
Singh, K.
Marí, B.
Mollar, M.
Jindal, J.
Powiązania:: https://bibliotekanauki.pl/articles/1075354.pdf
Data publikacji:: 2016-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.37.Hk
68.55.J-
68.60.Bs
Opis:: The anodic oxide films were prepared on the niobium and tantalum in aqueous electrolyte mixtures containing 1 M CH₃COOH + 1 M H₃PO₄ or 1 M CH₃COOH + 1 vol.% HF or 1 M CH₃COOH + 1 M H₃PO₄ + 1 vol.% HF at 30 V for 30 min. The barrier films were obtained on both niobium and tantalum surfaces in all electrolyte mixtures except niobium oxide film formed in 1 M CH₃COOH + 1 vol.% HF which is porous in nature. The anodic oxide films were characterized by FESEM. Also, electrochemical impedance spectroscopy at open-circuit potential on Nb and Ta was applied and obtained data were analyzed by fitting with four different equivalent circuits.
Źródło:: Acta Physica Polonica A; 2016, 129, 3; 297-303
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:: Thermoacoustical Excess Properties of Binary Liquid Mixtures - A Comparative Experimental and Theoretical Study
Autorzy:: Yasmin, M.
Singh, K.
Parveen, S.
Gupta, M.
Shukla, J.
Powiązania:: https://bibliotekanauki.pl/articles/1808024.pdf
Data publikacji:: 2009-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.35.+d
62.60.+v
82.60.Lf
Opis:: Specific heat ratio (γ), pseudo-Grüneisen parameter (Γ), heat capacity $(C_p)$ and effective Debye temperature $(θ_{D})$ for binary system of tetrahydrofuran with o-cresol and methanol respectively, were calculated using the experimentally measured densities, velocities and viscosities of the pure liquids and their mixtures over the whole composition range and at T = 293, 303, 313 K. The excess pseudo-Grüneisen parameter $(Γ ^{E})$, excess molar isentropic compressibility $(K_{s}^{E})$ and excess acoustic impedance $(Z^{E})$ were also calculated. The excess deviation functions have been correlated using Redlich-Kister polynomial equation. The observed values of the excess parameters plotted against the mole fraction of tetrahydrofuran have been explained on the basis of intermolecular interaction suggesting strong interaction in tetrahydrofuran + o-cresol than in tetrahydrofuran + methanol. Partial molar isentropic compressibility at infinite dilution and their excess values were calculated for each component. Sanchez theory, Goldsach-Sarvas volume fraction statistics, Sudgen's relation, Flory-Patterson-Rastogi and Brock and Bird model were used with the Aurebach relation to compute theoretically the values of ultrasonic velocities at varying temperatures. The velocity deviations were estimated in terms of average percentage deviations. Internal pressure for both the systems were calculated theoretically and discussed on the basis of relative applicability of the models in theoretical estimations. The isothermal compressibility $(k_T)$, for these binary mixtures were theoretically evaluated by using the Flory statistical theory and five hard sphere models and compared with the experimental values.
Źródło:: Acta Physica Polonica A; 2009, 115, 5; 890-900
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:: Sensitivity enhancement of metamaterial-based surface plasmon resonance biosensor for near infrared
Autorzy:: Pal, S.
Prajapati, Y. K.
Saini, J. P.
Singh, V.
Powiązania:: https://bibliotekanauki.pl/articles/173477.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: metamaterials
sensor sensitivity
reflectance
evanescent field
Opis:: The present study investigates the angular response and sensitivity of a surface plasmon resonance biosensor with metamaterial, by taking the advantage of the remarkable property of metamaterials. The proposed biosensor numerically shows that silver with a metamaterial layer enhances the sensitivity. The thickness of metamaterial and silver layer has been optimized. On comparing these results with a conventional surface plasmon resonance biosensor, it is observed that the sensitivity of the proposed biosensor is improved by introducing the metamaterial. The proposed biosensor has a sensitivity 6.3124 times higher than that of the conventional surface plasmon resonance sensor.
Źródło:: Optica Applicata; 2016, 46, 1; 131-143
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:: Luminescence Properties of CaAl₂O₄:Eu³⁺, Gd³⁺ Phosphors Synthesized by Combustion Synthesis Method
Autorzy:: Verma, N.
Singh, K.
Marí, B.
Mollar, M.
Jindal, J.
Powiązania:: https://bibliotekanauki.pl/articles/1030093.pdf
Data publikacji:: 2017-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: phosphors
luminescence
combustion method
calcium aluminate
Opis:: CaAl₂O₄:Eu³⁺ (1 mol.%) co-doped with varying concentration of Gd³⁺ (1, 2, 5, and 10 mol.%) were prepared by combustion synthesis method at 600°C and further annealed at 1000°C. All the compositions were investigated for their structural and photoluminescence properties. It was observed that both states of europium i.e. Eu³⁺ and Eu²⁺ were present and ratio of these states changes on heating at 1000°C. The materials synthesized at 600°C showed high intense peak around 440 nm due to presence of Eu²⁺ and less intense peaks in the red region which were due to presence of Eu³⁺. On annealing the compounds at 1000°C, intensity of peak around 440 nm decreases and intensity of peaks in the red region increases significantly. The ⁵D₀ → ⁷F₃ transition due to Eu³⁺ at 657 nm appears as the highest intensity peak. All co-doped samples annealed at 1000°C showed the higher intensity than the mono doped sample which is due to energy transfer from the Gd³⁺ to Eu³⁺. The second rare-earth ion (Gd³⁺) acts as sensitizer and enhances the photoluminescence intensity. The X-ray diffraction spectra reveal the monoclinic phase of CaAl₂O₄ in all the samples which showed that Eu³⁺ and Gd³⁺ do not change the crystalline structure of calcium aluminate.
Źródło:: Acta Physica Polonica A; 2017, 132, 4; 1261-1264
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:: Studies on biosynthesis of silver nanoparticles using Rhizopus sp. and its antibacterial efficacy on E. coli MDR strains
Autorzy:: Hiremath, J.
Rathod, V.
Ninganagouda, S.
Singh, D.
Prema, K.
Powiązania:: https://bibliotekanauki.pl/articles/11479.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: biosynthesis
silver nanoparticle
Rhizopus
antibacterial activity
Escherichia coli
multidrug resistance
nanotechnology
Opis:: Nanotechnology is a field that is burgeoning day by day, making an impact in all spheres of human life. Biological methods of synthesis have paved way for the “greener synthesis” of nanoparticles and these have proven to be better methods due to slower kinetics, they offer better manipulation and control over crystal growth and their stabilization. In this context we have investigated extracellular biosynthesis of silver nanoparticles (AgNPs) using cell-free extract of Rhizopus spp.. Formation of AgNPs was indicated by the change in the colour of the cellfree extract from yellow to dark brown under static condition after 48 hrs of incubation. Characterization of AgNPs was carried out by UV-Vis Spectroscopy which gave sharp plasmon resonance peak at 429 nm corresponding to spherical shaped nanoparticles. Transmission electron microscopy (TEM) micrograph showed formation of well-dispersed AgNPs in the range of 25-50 nm. Scanning electron microscopy (SEM) showed the particles to be uniformly dispersed without agglomeration with smooth morphology. EDS showed the presence of elemental silver at 3kev. X-ray diffraction (XRD)-spectrum of the AgNPs exhibited 2θ¸ values corresponding to nanocrystal. These biosynthesized AgNPs were used to study their antimicrobial activity against Multi-drug resistant (MDR) E. coli strains, by Agar diffusion method. Zone of inhibition was measured. Synthesis of nanosized particles with antibacterial properties, which are called "nanoantibiotics", is of great interest in the development of new pharmaceutical products.
Źródło:: International Letters of Natural Sciences; 2014, 18
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:: Isolation and in vitro cytotoxic activity of 11-methylixoside isolated from bark of Randia dumetorum Lamk.
Izolacja i działanie cytotoksyczne in vitro 11-metyliksozydu wyizolowanego z kory Randia dumetorum Lamk.
Autorzy:: Jangwan, J.S.
Aquino, R.P.
Mencherini, T.
Singh, R.
Powiązania:: https://bibliotekanauki.pl/articles/71884.pdf
Data publikacji:: 2013
Wydawca:: Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:: isolation
in vitro
cytotoxic activity
11-methylixoside
bark
Randia dumetorum
Rubiaceae
tree
medicinal plant
plant morphology
Opis:: Randia dumetorum (family Rubiaceae) is highly reputed ayurvedic medicinal tree commonly known as the Mainphal. A large deciduous thorny shrub grows up to 5 m of height. It occurs almost throughout India up to 1200 m of altitude. It is found in Himalaya from Jammu East ward ascending to 400 m and from Kashmir to East ward up to 1200 m. 11-methylixoside (compound 1), an iridoid glucoside, was isolated from the bark of this plant. The structure was characterized by using spectroscopic methods including 1D-1HNMR,13C-NMR and 2D-NMR (HSQC,HMBC, DQF-COSY) experiments and confirmed by comparison of their NMR data with those from the literature. This compound has been reported for the first time in Randia dumetorum bark. The 11-methylixoside was subjected to cytotoxic activity against MDA-MB-231 (breast cancer cell line) and SK-MEL-2 (human skin melanoma cell line), BE(2)C (neuroblastoma cell line derived from human bone marrow) and U87MG (human neuronale glioblastoma (astrozytom) cell line showed appreciable cytotoxic effect with IC50 value 63.10 µg/ml concentration for SK-MEL-2 (human skin melanoma cell line).
Randia dumetorum (rodzina Apiaceae) jest rośliną cenioną w medycynie aiurwedyjskiej, znaną pod nazwą Mainphal. Duży, liściasty, ciernisty krzew osiąga wysokość 5 m. Występuje praktycznie w całych Indiach do wysokości 1200 m. Można go znaleźć w Himalajach od Jammu (400 m) do Kaszmiru (1200 m). Z kory tej rośliny wyizolowano glukozyd irydoidowy 11-metyloksyd (składnik 1). Jego strukturę zbadano za pomocą metod spektroskopowych obejmujących 1D-1HNMR,13C-NMR i 2D-NMR (HSQC,HMBC, DQF-COSY) i potwierdzono poprzez porównanie jego NMR danych z danymi literaturowymi. Obecność tego składnika stwierdzono po raz pierwszy w korze Randia dumetorum. Działanie cytotoksyczne 11-metyliksozydu było badane przeciw MDA-MB-231 (linia komórkowa raka sutka) i SK-MEL-2 (linia komórkowa czerniaka), BE(2)C (linia komórkowa neuroblastomy uzyskana z ludzkiego szpiku kostnego) i U87MG (linia komórkowa ludzkiej glioblastomy (gwiaździak). Wykazano znaczne działanie cytotoksyczne z wartością IC50 w stężeniu 63.10 µg/ml przeciw SK-MEL-2 (linia komórkowa czerniaka).
Źródło:: Herba Polonica; 2013, 59, 1
0018-0599
Pojawia się w:: Herba Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:: Is complementary and alternative medicine effective in job satisfaction among dentists with musculoskeletal disorders? A cross sectional study
Czy medycyna komplementarna i alternatywna ma wpływ na satysfakcję zawodową dentystów z zaburzeniami mięśniowo-szkieletowymi? Badanie przekrojowe
Autorzy:: Gupta, Devanand
Bhaskar, Dara J.
Gupta, Rajendra K.
Jain, Ankita
Yadav, Priyanka
Dalai, Deepak R.
Singh, Rajeshwar
Singh, Nisha
Chaudhary, Varunjeet
Singh, Ankit
Yadav, Ankit
Karim, Bushra
Powiązania:: https://bibliotekanauki.pl/articles/2166243.pdf
Data publikacji:: 2014-10-01
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: medycyna komplementarna i alternatywna
dentysta
zaburzenia mięśniowo-szkieletowe
complementary and alternative medicine
dentist
musculoskeletal disorders
Opis:: Background: Musculoskeletal disorders have serious impact on the profession of dentistry. There is common occurrence of pain due to incorrect posture in dental professionals. Complementary and alternative medicine (CAM) therapies may cast a new light on preventing and intercepting musculoskeletal disorders (MSD). An epidemiological study was conducted in an effort to contribute to the prevention of musculoskeletal disorders in dentistry. The purpose of this study was to determine the prevalence of MSD at dentists using CAM as a treatment and preventive modality for MSD and to compare job/career satisfaction between dentists who use CAM and conventional therapy (CT). Material and Methods: Dentists registered in Uttrakhand state, India, under the Dental Council of India and registered members of the Indian Dental Association, Uttrakhand branch (N = 1496) were surveyed. Statistical analysis was conducted using SPSS 17. Results: A response rate of 84% (N = 1257) was obtained, revealing that 90% (N = 1131) had the problem of MSD. Seventy three percentage (N = 826) of dentists with MSD reported the use of CAM and CT. Complementary and alternative medicine users reported greater overall health (72.7% vs. 51%, p < 0.001), job satisfaction (61.2% vs. 35%, p < 0.001) and work efficiency compared to CT users. Conclusions: Complementary and alternative medicine therapies may improve quality of life, reduce work interruption and enhance job satisfaction for dentists who suffers from MSD. Through the course of their studies, dentists should be equipped with knowledge on ergonomics and CAM therapies, such as yoga and others, to help them prevent musculoskeletal disorders more effectively. Med Pr 2014;65(3):317–323
Wstęp: Zaburzenia mięśniowo-szkieletowe znacząco wpływają na wykonywanie zawodu przez lekarzy dentystów. W tej grupie zawodowej obserwuje się powszechne występowanie bólu z powodu nieprawidłowej postawy ciała. Terapie z zakresu medycyny komplementarnej i alternatywnej (complementary and alternative medicine - CAM) mogą rzucić nowe światło na zapobieganie zaburzeniom mięśniowo-szkieletowym (musculoskeletal disorders - MSD). Celem badania było ustalenie, czy w przypadku MSD dentyści korzystają z medycyny alternatywnej. Porównano także satysfakcję zawodową dentystów, którzy stosują terapie CAM i tych korzystających z terapii konwencjonalnej. Materiał i metody: W badaniu wzięli udział dentyści zarejestrowani w regionie Uttrakhand (Indie) w Radzie Dentystycznej Indii i będący członkami Indyjskiego Towarzystwa Dentystycznego (oddział Uttrakhand) (N = 1496). Analizy statystyczne przeprowadzono za pomocą pakietu SPSS 17. Wyniki: Wskaźnik odpowiedzi wyniósł 84% (N = 1257). Aż 90% (N = 1131) respondentów cierpiało z powodu MSD. Korzystanie z CAM i terapii konwencjonalnej zgłosiło 73% (N = 826) dentystów biorących udział w badaniu, u których występowały MSD. Osoby stosujące CAM w porównaniu z osobami leczącymi się konwencjonalnie zgłaszały lepszy ogólny stan zdrowia (72,7% vs 51%, p < 0,001), wyższy poziom satysfakcji zawodowej (61,2% vs 35%, p < 0,001) i były w stanie pracować w takim wymiarze czasu, w jakim chciały (56,8% vs. 67%, p < 0,001) Wnioski: Terapie CAM mogą poprawić jakość życia, zredukować przerwy w pracy i zwiększyć satysfakcję zawodową u dentystów cierpiących na MSD. Już na etapie studiów należy przekazać dentystom wiedzę z zakresu ergonomii oraz terapii CAM, żeby potrafili skuteczniej zapobiegać wystąpieniu zaburzeń mięśniowo-szkieletowych. Med.Pr. 2014;65(3):317–323
Źródło:: Medycyna Pracy; 2014, 65, 3; 317-323
0465-5893
2353-1339
Pojawia się w:: Medycyna Pracy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:: Volumetric, Optical, Acoustical and Viscometric Study of Molecular Association in Binary Mixtures of Butylamine with 1-Butanol and Tert-Butanol
Autorzy:: Singh, S.
Parveen, S.
Shukla, D.
Gupta, M.
Shukla, J. P.
Powiązania:: https://bibliotekanauki.pl/articles/2047348.pdf
Data publikacji:: 2007-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.35.+d
62.60.+v
82.60.Lf
Opis:: Density (ρ), refractive index (n), ultrasonic velocity (u), and viscosity (η) were measured for the binary mixtures formed by butylamine with 1-butanol and tert-butanol at temperatures 293, 303, and 313 K over the entire composition range. Excess molar volume V$\text{}_{m}^{E}$, molar refraction deviation ΔR$\text{}_{m}$, deviation in ultrasonic velocity Δu, viscosity deviation Δη, and excess Gibb's free energy of activation for viscous flow ΔG$\text{}^{*E}$ were derived from the experimental data and the computed results were fitted to the Redlich-Kister polynomial equation. The values of V$\text{}_{m}^{E}$, ΔR$\text{}_{m}$, Δu, Δη, and ΔG$\text{}^{*E}$ were plotted against the mole fraction of butylamine. The observed positive and negative values of excess parameters for both the mixtures were explained on the basis of intermolecular interactions present in these mixtures. The higher negative values of V$\text{}_{m}^{E}$ and ΔR$\text{}_{m}$ and positive values of Δu, Δη, and ΔG$\text{}^{*E}$ for butylamine + 1-butanol mixture suggest that specific interactions are taking place in butylamine + 1-butanol mixture, while weak dipole-dipole induced forces and dispersive forces seem to be responsible for butylamine + tert-butanol mixture. Furthermore, different empirical relations were used to correlate the binary refractive indices. An excellent agreement was found between experimental and theoretical values.
Źródło:: Acta Physica Polonica A; 2007, 111, 6; 847-858
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 40.

Tytuł:: Refractive Indices, Order Parameter and Optical Transmittance Studies of a Nematic Liquid Crystal Mixture
Autorzy:: Singh, A. K.
Manohar, R.
Shukla, J. P.
Biradar, A. M.
Powiązania:: https://bibliotekanauki.pl/articles/2047089.pdf
Data publikacji:: 2006-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.30.-v
42.70.Df
Opis:: Measurements of ordinary refractive index, birefringence, density, and order parameter were made on a technologically important nematogen and the data obtained for its nematic and isotropic phase were reported. A modified wedge method was used for the measurement of the birefringence (δ n). The nematic-isotropic phase transition temperature matches very well as is exhibited from the value of refractive indices and densities obtained using different techniques. The optical anisotropy and density data were used to determine the order parameter and principal polarizability of the nematic mixture using the Vuks approach and their temperature dependence was discussed. The macroscopic order parameter was obtained and compared with microscopic order parameter. These two values agree very well.
Źródło:: Acta Physica Polonica A; 2006, 110, 4; 485-493
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 41.

Tytuł:: Chemical constituents of ethanol extract of leaves and molluscicidal activity of crude extracts from Vitex trifolia Linn.
Składniki chemiczne etanolowego wyciągu z liści i działanie przeciwślimakowe nieoczyszczonego wyciągu z Vitex trifolia Linn.
Autorzy:: Jangwan, J.S.
Aquino, R.P.
Mencherini, T.
Picerno, P.
Singh, R.
Powiązania:: https://bibliotekanauki.pl/articles/71567.pdf
Data publikacji:: 2013
Wydawca:: Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:: chemical constituent
ethanol extract
leaf
molluscicidal activity
crude extract
Vitex trifolia
Verbenaceae
beta-sitosterol
ursolic acid acetate
Opis:: β-sitosterol and two triterpenoids: ursolic acid acetate and platanic acid have been isolated from ethanolic extract of Vitex trifola leaves. β-sitosterol was previously isolated from the leaves, stem and seeds of Vitex trifolia. Ursolic acid acetate has been isolated for the first time in this plant species. Platanic acid has been reported for the first time in Vitex trifolia and even in the family of this plant: Verbenaceae. These compounds were characterized using spectroscopic methods including 1D-1HNMR, 13CNMR, ESIMS and 2D-NMR (HSQC, HMBC, COSY) experiments and confirmed by comparison of their NMR data with those from the literature. A preliminary molluscicidal test for ethanol, chloroform and n-hexane extracts of leaves of Vitex trifolia against Biomphalaria alexandrina adult snails showed that ethanol extract of leaves with LC50 value 26.42 mg/l (27.92 mg/l – 24.99 mg/l) was more effective than n-hexane extract with LC50 value 35.48 mg/l (43.81 mg/l – 28.72mg/l) and chloroform extract with LC50 value 46.77 mg/l (53.59 mg/l – 43.81 mg/l) after 24 h exposure.
Z etanolowego wyciągu z liści Vitex trifola wyizolowano β-sitosterol i dwa triterpenoidy: octan kwasu ursolowego i kwas platanowy. Poprzednio z liści, łodyg i nasion Vitex trifola był wyizolowant β-sitosterol. Octan kwasu ursolowego został wyizolowany po raz pierwszy z rośliny tego gatunku. Występowanie kwasu platanowego w Vitex trifolia oraz w rodzinie Verbenaceae zostało opisane po raz pierwszy. Składniki te scharakteryzowano, używając metod spektroskopowych, stosując badania 1D-1HNMR, 13CNMR, ESIMS and 2D-NMR (HSQC, HMBC, COSY) oraz potwierdzono porównaniem ich danych NMR z danymi literaturowymi. Wstępny test działania przeciwślimakowego wyciągów etanolowego, chloroformowego i n-heksanowego z liści Vitex trifolia przeciw dorosłym ślimakom Biomphalaria
Źródło:: Herba Polonica; 2013, 59, 4
0018-0599
Pojawia się w:: Herba Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:: Studies on Curing of an Aluminized Ammonium Perchlorate Composite Propellant Based on Nitrile Butadiene Rubber Using a Quinol Ether of 1,4-Benzoquinone Dioxime
Autorzy:: Singh, Sudhir
Raveendran, Sidharth
Kshirsagar, Dhirendra R.
Gupta, Manoj
Bhongale, Chetan J.
Powiązania:: https://bibliotekanauki.pl/articles/27788068.pdf
Data publikacji:: 2022
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: dinitrosobenzene
nitrile butatadiene rubber
quinol ether
unsaturated rubber
Opis:: The isocyanate-based curing agents used for polyurethane are toxic and hygroscopic in nature. In the present work, an alternate approach was adopted, a reaction between the unsaturated rubber having an α-methylene hydrogen atom and a dinitrosobenzene (DNB) - generating system (quinol ether of 1,4-benzoquinone dioxime, QE) without a catalyst, thus generating a cured system. QE is a novel curing agent for propellant applications which imparts the necessary curing. The curing reaction between nitrile butatadiene rubber (NBR) and quinol ether (QE) was studied by FTIR and the results revealed the formation of anil groups (Ar–C=N). The anil group results from the reaction between NBR and DNB, generated on decomposition of QE. Propellant formulations were prepared with variation of the curing agent from 0.2 to 0.5%. The composition and rheological, mechanical, ballistic and thermal properties of the resulting cured systems were investigated. The viscosity and spreadability were suitable for casting. The tensile strength, modulus, and hardness show an increasing trend and the elongation decreases on varying QE from 0.2 to 0.5% in the propellant. However, all of the compositions showed nearly the same burning rate and pressure exponent. The QE based curing system is non-hygroscopic and has extremely low toxicity. The experimental results revealed that the proposed curing agent may find application in explosives and propellants.
Źródło:: Central European Journal of Energetic Materials; 2022, 19, 1; 18--38
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 43.

Tytuł:: Identifying overlapping phylogenetic and geographic roots of HIV - 1 evolution through computational analyses
Autorzy:: Singh, P.K.
Banik, R.
Chakraborty, H.J.
Das, S.G.
Ganguli, S.
Datta, A.
Powiązania:: https://bibliotekanauki.pl/articles/11359.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: phylogenetic root
geographic root
evolution
computational analysis
HIV-1
genome
recombinant strain
AIDS
human disease
acquired immunodeficiency syndrome zob.AIDS
acquired immune deficiency syndrome zob.AIDS
Opis:: HIV-1 or Human Immuno Deficiency Virus-1 is the main causative agent of Acquired Immuno Deficiency Syndrome (AIDS). Human host infected with HIV - 1 extensively harbours many viral variants but very little is known about the difference in pattern[17] of evolution of phylogenetic lineages of HIV-1 non recombinant, normal inter subtype recombinant and main two specific recombinant forms of HIV-1 i.e., Circulating Recombinant Forms (CRFs) and Unique Recombinant Forms (URFs). This study is mainly concerned with study of the difference in evolutionary lineages of non-recombinant and recombinant sequences of HIV-1 genome sequences and identification of geographically rich areas which has reported high degree of HIV-1 occurrence and variety. Total 1550 HIV-1 genome sequences were obtained from HIV Los Alamos Database. The sequences were aligned using MAFFT (Multiple Alignment using Fast Fourier Transform) web server tool. Alignment was carried out using 10 different set of alignment parameter values. After alignment the aligned file was used for constructing N-J phylogenetic tree using Clustal X2 tool. Phylogenetic analysis was performed keeping in mind the category to which the sequence belongs. Upon analysis it was observed that the clade containing the probable ancestor belongs remained constant in all cases of different alignment values. Non recombinant isolates, inter subtype recombinants, CRFs, URFs all followed different patterns of evolution. Non recombinant sequences were found geographically specific and subtype specific to some extent whereas, normal recombinants were subtype specific and less geographically specific. CRFs showed variation among the pattern of their evolution. At some instances the sequences occurred as sister taxa of non-recombinant or normal inter subtype recombinant sequences, while at some instances as sister taxa of other CRFs where they were geographically specific. Three CRFs existed as completely diverged sequences. URFs were four in number; two of them were Indian isolates of while other two were Japanese isolates. URFs were found to be totally geographically specific. Geography wise high rate of variation was observed in India and Japan as these two countries had sequences belonging to all of the above categories. Cameroon and South Africa have very large number isolates and a considerable amount of genetic variation among isolates but they lack URFs.
Źródło:: International Letters of Natural Sciences; 2014, 02
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 44.

Tytuł:: A diverse snake fauna from the early Eocene of Vastan Lignite Mine, Gujarat, India
Autorzy:: Rage, J -C
Folie, A.
Rana, R.S.
Singh, H.
Rose, K.D.
Smith, T.
Powiązania:: https://bibliotekanauki.pl/articles/22685.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cambay Formation
Vastan Lignite Mine
Gujarat
fossil snake
Early Eocene
paleontology
Caenophidia
India
Serpentes
snake fauna
Opis:: The early Eocene (Ypresian) Cambay Formation of Vastan Lignite Mine in Gujarat, western India, has produced a diverse assemblage of snakes including at least ten species that belong to the Madtsoiidae, Palaeophiidae (Palaeophis and Pterosphenus), Boidae, and several Caenophidia. Within the latter taxon, the Colubroidea are represented by Russellophis crassus sp. nov. (Russellophiidae) and by Procerophis sahnii gen. et sp. nov. Thaumastophis missiaeni gen. et sp. nov. is a caenophidian of uncertain family assignment. At least two other forms probably represent new genera and species, but they are not named; both appear to be related to the Caenophidia. The number of taxa that represent the Colubroidea or at least the Caenophidia, i.e., advanced snakes, is astonishing for the Eocene. This is consistent with the view that Asia played an important part in the early history of these taxa. The fossils come from marine and continental levels; however, no significant difference is evident between faunas from these levels. The fauna from Vastan Mine includes highly aquatic, amphibious, and terrestrial snakes. All are found in the continental levels, including the aquatic palaeophiids, whereas the marine beds yielded only two taxa. Vastan Mine is only the second locality in which the palaeophiids Palaeophis and Pterosphenus co−occur. The composition of the fauna from Vastan is on the whole similar to that of the early Eocene of Europe; however, comparisons with early Eocene faunas of other continents are not possible because they are poorly known or unknown.
Źródło:: Acta Palaeontologica Polonica; 2008, 53, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:: Experimental Studies on a High Energy Sheet Explosive Based on RDX and Bis(2,2-dinitropropyl) Formal/Acetal (BDNPF/A)
Autorzy:: Jangid, S. K.
Singh, M. K.
Solanki, V. J.
Pandit, G.
Nath, T.
Sinha, R. K.
Powiązania:: https://bibliotekanauki.pl/articles/358136.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: sheet explosive
polyurethane
explosive reactive armour
BDNPF/A
RDX
Opis:: A plastic bonded explosive (PBX) in the form of a sheet explosive was formulated with 1,3,5-trinitro-1,3,5-triazinane (RDX) dispersed in a polymeric matrix of a thermoplastic linear polyurethane and a 50/50 wt.% eutectic mixture of energetic plasticizers, viz., bis(2,2-dinitropropyl)formal (BDNPF) and bis(2,2-dinitropropyl)acetal (BDNPA) was used to increase the performance of the sheet explosive in terms of its velocity of detonation (VOD). The sheet explosives were prepared by a rolling process. Natural rubber (ISNR-5) based sheet explosive was taken as the standard composition. The study showed that the BDNPF/A based sheet explosive has a velocity of detonation of 7850 m/s, which is about 900 m/s higher than the standard composition. Thermal analysis of the sheet explosive formulations was performed using differential scanning calorimetry (DSC).
Źródło:: Central European Journal of Energetic Materials; 2016, 13, 3; 557-566
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:: Occupational health and metabolic risk factors: A pilot intervention for transport workers
Autorzy:: Naug, Helen L.
Colson, Natalie J.
Kundur, Avinash
Santha Kumar, Abishek
Tucakovic, Lada
Roberts, Michael
Singh, Indu
Powiązania:: https://bibliotekanauki.pl/articles/2177422.pdf
Data publikacji:: 2016-05-05
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: obesity
transport workers
lifestyle education
education interventions
sedentary behavior
metabolic risk
Opis:: Objectives Heavy vehicle transport workers have a high risk of obesity and obesity-related disorders including cardiovascular disease and diabetes. Sedentary nature of their work makes a healthy work and lifestyle balance difficult to achieve. Educational interventions that promote behavioral changes have been shown to be effective in various group settings. The aims of this study were to determine the prevalence of metabolic risk factors among a population of urban bus drivers; to deliver a 3-month educational intervention specifically tailored for the workplace environment of transport workers; and to evaluate the efficacy of the intervention through quantitative measurements and qualitative feedback. Material and Methods Thirty-three bus drivers from depots in south Queensland were recruited for the study. Baseline metabolic data were collected through anthropometric measurements, blood collection and diet/lifestyle questionnaires. Metabolic risk factors that were analyzed included: waist circumference, blood pressure, fasting glucose, blood triglycerides and high density lipoprotein cholesterol (HDL-C). Three interactive seminars were delivered over a 3-month period. At the end of the period, data collection was repeated. Results At the commencement of the study, 35% of the participants exhibited ≥ 3 of the metabolic risk factors that characterize metabolic syndrome. This is higher than the reported prevalence in the general Australian population (22.1%). A total 21 of the 33 participants remained committed to the intervention and provided pre and post intervention data. Of these, 28% (N = 6) showed a decrease in one or more of the risk factors associated with metabolic syndrome. There was a significant increase in the average HDL-C after the intervention. Qualitative feedback indicated that the workers benefited from the program, especially regarding their awareness of the risks associated with their profession. Conclusions This pilot study demonstrates that lifestyle education seminars specifically tailored for the workplace can have an impact on the health behaviors of transport workers.
Źródło:: International Journal of Occupational Medicine and Environmental Health; 2016, 29, 4; 573-584
1232-1087
1896-494X
Pojawia się w:: International Journal of Occupational Medicine and Environmental Health
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:: Studies on the effect of coal particle size on biodepyritization of high sulfur coal in batch bioreactor
Autorzy:: Singh, S.
Srichandan, H.
Pathak, A.
Gahan, Ch. S.
Lee, S.
Kim, D. J.
Kim, B. G.
Powiązania:: https://bibliotekanauki.pl/articles/778523.pdf
Data publikacji:: 2015
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: biodepyritization
coal
pyrite
stirred tank bioreactor
Opis:: The moderate thermophilic mix culture bacteria were used to depyritize the Illinois coal of varying particle sizes (-100 μm, 100-200 μm, +200 μm). Mineral libration analysis showed the presence of pyrite along with other minerals in coal. Microbial depyritization of coal was carried out in stirred tank batch reactors in presence of an iron-free 9K medium. The results indicate that microbial depyritization of coal using moderate thermophiles is an efficient process. Moreover, particle size of coal is an important parameter which affects the efficiency of microbial depyritization process. At the end of the experiment, a maximum of 75% pyrite and 66% of pyritic sulphur were removed from the median particle size. The XRD analysis showed the absence of pyrite mineral in the treated coal sample. A good mass balance was also obtained with net loss of mass ranging from 5-9% showing the feasibility of the process for large scale applications.
Źródło:: Polish Journal of Chemical Technology; 2015, 17, 1; 97-102
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 48.

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

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Skocz do pozycji: 49.

Tytuł:: Corrosion behavior of ZrC particles reinforcement with Al-12Si composites by weight loss method using acidic media
Autorzy:: John, C. F.
Paul, R. C.
Singh, S. C. E.
Jacobjose, J.
Ramkumar, T.
Hikku, G. S.
Sharma, R. K.
Sengottuvel, P.
Powiązania:: https://bibliotekanauki.pl/articles/200059.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-Si-ZrC composites
powder metallurgy
weight loss method
corrosion rate
SEM
kompozyty Al-Si-ZrC
metalurgia proszków
metoda redukcji masy
szybkość korozji
Opis:: This paper aims to investigate the corrosion behavior of zirconium carbide (ZrC) reinforced Al – Si metal matrix composites (MMCs) in a mixture of acidic solution using weight loss method. The composites are prepared by powder metallurgy method. Al-12Si-xZrC composites containing 0, 5, and 10 weight percentage of ZrC particles are compacted in a die set assembly and sintered in an inert gas muffle furnace. The acidic solutions used for corrosion are 1 N HCl, 1 N H₂SO₄ and 1 N HNO₃. The corrosion characteristics of Al-12Si-xZrC composites and the pure Al were experimentally evaluated. The corrosion test was carried out at different weight proportions of the samples in various concentrations of the acid such as 1 N HCl, 1 N H₂SO₄ and 1 N HNO₃ for different exposure time (i.e., 24 h, 72 h, 144 h and 216 h), respectively. The results specified that corrosion rate of composites was lower than that of base metal Al under the corrosive atmosphere, regardless of exposure time and acidic solutions used as corrodents. Al-12Si-xZrC composites become more corrosion resistant as the ZrC content is increased. This is because of the development of stable oxide layer above the specimens. Scanning electron microscopy (SEM) confirms the degree of attack of acidic solution on the surface of the examined material.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 9-16
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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