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Tytuł:
A rapid, convient and diversified-multicomponent synthesis and characterization of pyrano[2,3-b]indoles
Autorzy:
Ghodasara, H. B.
Singala, P. M.
Shah, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/412134.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1,3-bifunctional synthon
Pyrano[2,3-b]indoles
multi component reaction
non-chromatographic metod
Opis:
A series of pyrano[2,3-b]indoles, was efficiently synthesized via one-pot, multi component reaction (MCRs) of 1,3-bifunctional synthon(malononitrile/ethylcyano acetate), aromatic aldehydes and oxiindole in the presence of various basic catalyst. The key advantages of this process are high yields, shorter reaction times, easy work-up, and purification of products by non-chromatographic method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 7; 69-76
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An efficient one-pot multicomponent synthesis and characterization of 5-cyano-1,2,3,4-tetrahydropyrimidine derivatives
Autorzy:
Vaghasiya, R. G.
Shah, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/411702.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
substituted pyrazole-4-carbaldehyde
5-cyano-1,2,3,4-tetrahydropyrimidine derivatives
multi component reaction
non-chromatographic method
Opis:
A series of pyrimidine-5-carbonitrile derivatives was efficiently synthesized via one-pot, multi component reaction (MCRs) of 1,3-bifunctional synthon (ethylcyano acetate), substituted pyrazole-4-carbaldehyde, and thiourea/urea in the presence of basic catalyst. The key advantages of this process are high yields, shorter reaction times, easy work-up, and purification of products by non-chromatographic method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 40; 51-60
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An EOQ model with time dependent deterioration under discounted cash flow approach when supplier credits are linked to order quantity
Autorzy:
Shah, B. J.
Shah, N. H.
Shah, Y. K.
Powiązania:
https://bibliotekanauki.pl/articles/970398.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
time dependent deterioration
discounted cashflows (DCF) approach
supplier credit linked to order quantity
Opis:
This article deals with an inventory model under a situation in which the supplier offers the purchaser some credit period if the purchaser orders a large quantity. Shortages are not allowed. The effects of the inflation rate on purchase price, ordering price and inventory holding price, time dependent deterioration of units and permissible delay in payment are discussed. A mathematical model is developed when units in inventory are subject to time dependent deterioration under inflation when the supplier offers a permissible delay to the purchaser if the order quantity is greater than or equal to a pre-specified quantity. Optimal solution is obtained and algorithm is given to find the optimal order quantity and replenishment time, which minimizes the total cost of an inventory system in different scenarios. The paper concludes with a numerical example to illustrate the theoretical results and interdependence of parameters is studied for the optimal solutions.
Źródło:
Control and Cybernetics; 2007, 36, 2; 405-423
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Eco-Friendly Natural Antimicrobial Textile Finish Extracted from Aloe Vera and Neem Plants
Ocena ekologicznych naturalnych preparacji antymikrobowych tekstyliów uzyskanych z udziałem ekstraktów z aloesu i miodli indyjskiej
Autorzy:
Khurshid, M. F.
Ayyoob, M.
Asad, M.
Shah, S. N. H.
Powiązania:
https://bibliotekanauki.pl/articles/233713.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
eco-friendly
antimicrobial
natural textile finish
aloe vera extraction
neem extraction
ekologiczne preparacje
przeciwbakteryjne preparacje
naturalne wykończenie tkaniny
ekstrakcja z aloesu
ekstrakcja z miodli indyjskiej
Opis:
The aim of the present work was to assess an eco friendly natural antimicrobial textile finish extracted from Aloe gel and Neem plants. Extracted Aloe gel and active substance of Neem were mixed in a mordant to form a finish. Bleached cotton samples were treated with 5, 7, and 10% concentrations of Aloe gel and Neem separately. The same samples were then treated with a hybrid combination of Aloe gel and Neem (HCAN) extracts having 5, 7 and 10% concentrations. These finished samples were subjected to an antibacterial activity test against E. coli and S. aureus, an antifungal activity test against Aspergillus Niger, and a test of their durability of antibacterial finish fastness to washing by standard test methods. It was found that the hybrid combination of Aloe gel and Neem (HCAN) was an effective antibacterial and antifungal agent as compared to Aloe gel and Neem separately. It also showed good durability to washing.
Ekstrakty z żelu aloesowego i aktywnych substancji miodli indyjskiej mieszano w zaprawie barwiarskiej dla uzyskania gotowej preparacji. Bielone bawełniane próbki nasycano roztworem o stężeniu 5%, 7% i 10% żelu aloesowego i miodli indyjskiej. Te same próbki były następnie nasycane preparacją hybrydową zawierającą obydwa składniki o tym samym stężeniu. Uzyskane próbki poddano badaniom antybakteryjnym przeprowadzając testy przeciwko E. coli i S. aureus, i antygrzybicznej aktywności przeciwko Aspergillus niger. Niezależnie od tego przeprowadzano próby trwałości preparacji antybakteryjnych po praniu w standardowych warunkach. Stwierdzono, że preparacja hybrydowa obydwu składników była aktywniejsza zarówno w stosunku do bakterii i grzybów niż preparacje z użyciem jednego tylko składnika.
Źródło:
Fibres & Textiles in Eastern Europe; 2015, 6 (114); 120-123
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges and opportunities for the future of icampuses
Autorzy:
Thomas, A. M.
Shah, H.
Moore, P.
Evans, C.
Sharma, M.
Pham, H. V.
Osman, K.
Wilcox, A. J.
Rayson, P.
Chapman, C.
Chima, P.
Athwal, C.
While, D.
Powiązania:
https://bibliotekanauki.pl/articles/952933.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
education
icampus
sensors
context
Web 2.0
Opis:
Meeting the educational needs of students currently requires moving toward collaborative electronic and mobile learning systems that parallel the vision of Web 2.0. However, factors such as data freedom, brokerage, interconnectivity and the Internet of Things add to a vision for Web 3.0 that will require consideration in the development of future campus-based, distance and vocational study. So, education can, in future, be expected to require deeper technological connections between students and learning environments, based on significant use of sensors, mobile devices, cloud computing and rich-media visualization. Therefore, we discuss challenges associated with such a futuristic campus context, including how learning materials and environments may be enriched by it. As an additional novel element the potential for much of that enrichment to be realized through development by students, within the curriculum, is also considered. We will conclude that much of the technology required to embrace the vision of Web 3.0 in education already exists, but that further research in key areas is required for the concept to achieve its full potential.
Źródło:
Computer Science; 2013, 14 (1); 5-25
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coordinated production, ordering, shipment and pricing model for supplier-retailer inventory system under trade credit
Autorzy:
Shah, Nita H.
Naik, Monika K.
Powiązania:
https://bibliotekanauki.pl/articles/406551.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
defective item
production inventory system
supply chain of two players
time-price
credit
dependent demand
element uszkodzony
system inwentaryzacji produkcji
łańcuch dostaw
kredyt
popyt zależny
Opis:
The objective of this article is to maximize the joint profit for supplier and retailer by constructing a combined supplier–retailer inventory model wherein supplier and retailer both have implemented trade credit policies, and some defective items are received by the retailer. The customer’s demand is expressed as a function of time, price and credit period, which is appropriate for the products for which demand increases initially and after some time it starts to decrease. Production, directly proportional to the customer’s demand rate, is considered as one of the decision variables for the purpose of reducing the holding cost of the supplier. The article estimates the optimum replenishment cycle, customer’s credit period, retail selling price by a classical optimization technique. For validation of the derived model, various numerical examples are demonstrated. Finally, implementing sensitivity analysis on the decision variables by varying the inventory parameters, effective managerial insights are generated which is beneficial for the players of supply chain by practically gaining the maximum joint profit through advising to opt for the case N ≤ M ≤ T , i.e., when the customer’s trade credit period offered by the retailer is lesser than the retailer’s trade credit period offered by the supplier and which is lesser than the replenishment cycle length.
Źródło:
Operations Research and Decisions; 2019, 29, 2; 55-76
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disparity of a Seat Cushion and Its Influence on Postural Control
Autorzy:
Nag, P.K.
Nag, A.
Vyas, H.
Shah, P.
Powiązania:
https://bibliotekanauki.pl/articles/89723.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
cushion
foam
cotton
centre of pressure measurements
postural control
kontrola postawy ciała
postawa ciała
siedzenie
kontrola równowagi
Opis:
Properties of supporting surfaces of a seat have an influence on postural control. Centre of pressure (COP) displacement parameters reflect both the balance controlling process and movements of the centre of a mass of entire body. The subjects of the study were 9 healthy men. A seat cushion was examined with a 2-force platform setup. Force exertion at a seat pan and feet and COP displacement at a seat pan were measured to analyse postural control. Analysis of variance determined the differences in postural control depending on a cushion type among the subjects. Significant differences in COP displacement parameters were in COP trajectory length, medio-lateral COP displacement and COP velocity. The results of the study showed that foam cushion ensures better postural control.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 4; 573-581
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equilibrium, kinetics and thermodynamic study of the adsorptive removal of methylene blue from industrial wastewater by white cedar sawdust
Autorzy:
Gardazi, Syed Mubashar H.
Shah, Jehanzeb Ali
Ashfaq, Tayyab
Sherazi, Tauqir A.
Ali, Muhammad Arif
Pervez, Arshid
Rashid, Naim
Iqbal, Javed
Amin, Bilal Ahmad Zafar
Bilal, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/207373.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
methylene blue
industrial wastewater
white cedar sawdust
WCS
dye adsorption
błękit metylenowy
ścieki przemysłowe
trociny białego cedru
adsorpcja barwników
Opis:
The study evaluated the adsorption potential of white cedar sawdust (WCS) for dye removal. WCS was chosen from five preferred, abundant waste biomasses from Pakistan. Various parameters such as contact time, adsorbent dose, dye concentration, pH, and particle size were optimized for methylene blue (MB) dye adsorption. The adsorbent was characterized by FTIR, SEM, EDX and BET analyses. The surface area of the adsorbent was 1.43 m2·g-1 and pore volume was 0.000687 cm3·g-1. The adsorption data best fitted the isotherm models of Langmuir, Temkin, Dubinin–Radushkevich, and Freundlich. The maximum experimental adsorption capacity obtained was 55.15 mg·g-1, which was in close agreement to the calculated adsorption capacity. Fitness of the pseudo-second order kinetics suggested chemisorption as the rate-limiting step. Thermodynamic study for adsorption was carried out to evaluate the Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°). The negative values ΔG° at the examined temperature range confirmed the spontaneous adsorption of MB onto WCS.
Źródło:
Environment Protection Engineering; 2019, 45, 3; 5-22
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Highly efficient and eco-friendly one-pot synthesis of penta substitute pyrrole derivatives under catalyst-free conditions
Autorzy:
Viradiya, D. J.
Baria, B. H.
Kakadiya, R.
Kotadiya, V. C.
Shah, A.
Powiązania:
https://bibliotekanauki.pl/articles/412605.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
one-pot synthesis
penta-substituted pyrrole derivatives
multi-component reactions
Opis:
An eco-friendly and efficient one-pot synthesis of penta-substituted pyrrole derivatives via a four-component reaction of maldrum’s acid, arylglyoxal monohydrate, dimethyl but-2-yne-dioate and amines under catalyst-free conditions in an environmentally friendly medium is described. The simple experimental procedure, catalyst-free reaction conditions, short period of conversion, and excellent yields are the advantages of the present method. Good chemical yields have been achieved without the need for chromatography and recrystallization or other purification methods.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 257-264
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inventory models and trade credit: a review
Autorzy:
Soni, H.
Shah, N. H.
Jaggi, C. K.
Powiązania:
https://bibliotekanauki.pl/articles/969900.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
lot-size model
trade credit
deterioration
probabilistic demand
Opis:
This article reviews the literature on quantitatively oriented approaches for determining the optimal lot-size when supplier offers credit period to the retailer to settle their account. An attempt is made to provide an up-to-date review of existing literature, concentrating on descriptions of the types of problems that have been solved and important structural results.
Źródło:
Control and Cybernetics; 2010, 39, 3; 867-882
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Korean WA-DGNSS User Segment Software Design
Autorzy:
Shah, S. T.
Choi, W.S.
Han, W.Y.
Yun, H.
Kee, C.
Powiązania:
https://bibliotekanauki.pl/articles/116066.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
global navigation satellite system (GNSS)
Global Positioning System GPS
User Segment
GPS Data Processing Classes
Opis:
Korean WA‐DGNSS is a large scale research project funded by Ministry of Land, Transport and Maritime Affairs Korea. It aims to augment the Global Navigation Satellite System by broadcasting additional signals from geostationary satellites and providing differential correction messages and integrity data for the GNSS satellites. The project is being carried out by a consortium of universities and research institutes. The research team at Electronics and Telecommunications Research Institute is involved in design and development of data processing softwares for wide area reference station and user segment. This paper focuses on user segment software design. Korean WA‐DGNSS user segment software is designed to perform several functions such as calculation of pseudorange, ionosphere and troposphere delays, application of fast and slow correction messages, and data verification. It is based on a layered architecture that provides a model to develop flexible and reusable software and is divided into several independent, interchangeable and reusable components to reduce complexity and maintenance cost. The current version is designed to collect and process GPS and WADGNSS data however it is flexible to accommodate future GNSS systems such as GLONASS and Galileo.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 69-74
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maximizing power output of a partially shaded total-cross-tied photovoltaic array
Autorzy:
Shah, N. S.
Patel, H. H.
Powiązania:
https://bibliotekanauki.pl/articles/136262.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
current compensation
voltage equalization
MPPT
partial shading
TCT configuration
Opis:
Non-uniform conditions on the modules of the PV array, especially, partial shading reduces the output of the PV array to a large extent. The shaded module in a string limits the current of the entire string and hence, the output power of the string. The output power under such conditions is reported to be higher for total-cross-tied (TCT) configuration. This paper describes two different approaches, one based on current compensation (current equalization) and another based on voltage equalization, to extract higher power from the partially shaded total-cross-tied photovoltaic array. The TCT configuration is considered to minimize the number of converters, sensors, cost and complexity involved. The additional converters in the two distinct approaches evaluated here operate only when the partial shading occurs and are controlled to minimize the current and voltage miss-matches. The analysis and the control algorithm are presented. Simulation results obtained in MATLAB/Simulink are included to demonstrate the effectiveness of both methods and the relative merits and demerits of these approaches are highlighted.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 1; 10-18
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling computational studies of modified drug molecules binding to the LRRK2 protein in the treatment of Parkinson’s disease
Autorzy:
Shah, H.
Darsey, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/284742.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
LRRK2 proteins
Parkinson
Computational Modeling
IC50
Density Functional Theory
DFT
Opis:
Parkinson’s disease is a neurodegenerative and progressive disease of the central nervous system. It affects more than 10 million patients worldwide and the symptoms allow for little to no control for movement. These symptoms appear because the chemical messenger dopamine is being made in small quantities from impaired cells. However, the disease often forms when there is a mutation in the LRRK2 gene, as the functions of the protein become abnormal. The IC50 value is essential information about molecules because it measures their effectiveness. The goal of this research was to design molecules with a lower IC50 value. This was first done by modeling molecules on the molecular modeling program, Gaussian 09. Modifications were made to molecules that were said to bind to the LRRK2 protein. Modifications ranged from adding a single atom or replacing atoms with groups. After running these molecules on the program, the total energy was found. Using the equation found from the correlation between 1/IC50 and the total energy, the IC50 value was predicted for each of the modified molecules. Many of the modified molecules portrayed a positive percent difference between the original IC50 value and the new one. This saves both time and money because the molecules with lower IC50 values can be made, preserving the resources. After creating the molecule with a low IC50 value, further experimental procedures can be taken; this is a large step in assisting researchers to reach a potential treatment because it is more efficient.
Źródło:
Engineering of Biomaterials; 2018, 21, 145; 2-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Music Playlist Generation using Facial Expression Analysis and Task Extraction
Autorzy:
Sen, A.
Popat, D.
Shah, H.
Kuwor, P.
Johri, E.
Powiązania:
https://bibliotekanauki.pl/articles/908868.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
facial expression analysis
emotion recognition
feature extraction
viola jones face detection
gabor filter
adaboost
k-NN algorithm
task extraction
music classification
playlist generation
Opis:
In day to day stressful environment of IT Industry, there is a truancy for the appropriate relaxation time for all working professionals. To keep a person stress free, various technical or non-technical stress releasing methods are now being adopted. We can categorize the people working on computers as administrators, programmers, etc. each of whom require varied ways in order to ease themselves. The work pressure and the vexation of any kind for a person can be depicted by their emotions. Facial expressions are the key to analyze the current psychology of the person. In this paper, we discuss a user intuitive smart music player. This player will capture the facial expressions of a person working on the computer and identify the current emotion. Intuitively the music will be played for the user to relax them. The music player will take into account the foreground processes which the person is executing on the computer. Since various sort of music is available to boost one's enthusiasm, taking into consideration the tasks executed on the system by the user and the current emotions they carry, an ideal playlist of songs will be created and played for the person. The person can browse the playlist and modify it to make the system more flexible. This music player will thus allow the working professionals to stay relaxed in spite of their workloads.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2016, 16, 2; 1-6
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel conversion of 4-aminoquinolines to new tricyclic (R,S)-3-methylazeto[3,2-c] quinolin-2(2aH)-ones and versatile one step synthesis of N-(quinolin-4-yl) carbamates from 4-aminoquinolines
Autorzy:
Kotadiya, V. C.
Viradiya, D. J.
Baria, B. H.
Kanzariya, J. S.
Kakadiya, R.
Shah, A.
Powiązania:
https://bibliotekanauki.pl/articles/412269.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
quinolin
carbamates
azeto-quinolinone
aminoquinolines
Opis:
Reaction of 4-aminoquinolines with 4-nitrophenyl chloroformate have resulted in finding a novel transformation of 4-aminoquinolines to tricyclic (R,S)-3-methylazeto[3,2-c]quinolin-2(2aH)-ones. The structure of azeto-quinolinone was determined via spectroscopic and chemical methods. Various alcohols were used as nucleophiles to open the 1-azetinone ring to give the corresponding N-(quinolin-4-yl)carbamates in good yields. We also found a new and versatile one step synthesis of N-(quinolin-4-yl)carbamates by reacting 4-aminoquinolines with alkyl chloroformates in the presence of anhyd K2CO3 in acetonitrile.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 265-276
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
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