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Wyświetlanie 1-15 z 28
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:
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:
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:
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:
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:
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:
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:
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
Tytuł:
Novel s-Triazinyl Schiff Base/Chalcone Congeners: Rational, Synthesis, Antimicrobial and Anti-TB Evaluation
Autorzy:
Lakum, H. P.
Shah, D. R.
Chikhalia, K. H.
Powiązania:
https://bibliotekanauki.pl/articles/412603.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
antimicrobial
Anti-TB
s-Triazine
Schiff base
Chalcone
Opis:
The occurrence of Multi Drug Resistant (MDR) infectious microbial strains has been increased upto alarming level which affects the public health worldwide. To cure this problem, a library of s-triazinyl derivatives comprising schiff base or chalcone motif have been rationalized, synthesized and screened for their in vitro antibacterial activity against five bacterial strains (Staphylococcus aureus MTCC 96, Bacillus subtilis MTCC 441, Escherichia coli MTCC 739, Pseudomonas aeruginosa MTCC 741 and Klebsiella pneumoniae MTCC 109) and four fungal strains (Aspergillus niger MTCC 282, Aspergillus fumigates MTCC 343, Aspergillus clavatus MTCC 1323, Candida albicans MTCC 183) using broth dilution technique. All the newly synthesized scaffolds were further evaluated for their in vitro anti-TB efficacy against the tubercular strain (Mycobacterium tuberculosis H37Rv) using Lowenstein-Jensen MIC method. All the derivatives were well characterized by IR, 1H NMR, 13C NMR, elemental analysis as well as mass spectroscopy.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 56-73
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and antimicrobial activity of some new imidazolinone derivatives containing benzimidazole
Autorzy:
Mehta, P.
Davadra, P.
Shah, N.
Joshi, H.
Powiązania:
https://bibliotekanauki.pl/articles/411949.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
benzimidazole
imidazolinone
antimicrobial activity
Opis:
In this study some new o-benzimidazol-2'-yl-benzamido-p'-benzamido-2-phenyl-4-substituted phenyl-5-oxo-Imidazolines 3a-3j were synthesized. To synthesized target molecules we used various substituted oxazolone derivatives, synthesized from substituted benzaldehyde with hippuric acid. Substituted oxazolones 2a-2j were reacted with carbohydrazide derivative of benzimidazole 1 in presence of pyridine as base to obtained substituted imidazolinone derivatives. All synthesized compounds were characterized by IR, 1H NMR, elemental analysis and further supported by mass spectroscopy. All synthesized compounds were screened for their antimicrobial activity against gram positive and gram negative bacteria which showed moderate to good activity. All compounds showing good to moderate active against fungal strain as compare to standard drug.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 10; 74-80
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and antimicrobial screening of some new pyrimido[1,2-a]benzimidazole derivatives
Autorzy:
Shah, N. M.
Joshi, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/411967.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-aminobenzimidazole
pyrimido[1,2-a]benzimidazole
chalcone
antimicrobial activity azoloazine
Opis:
Some new pyrimido[1,2-a]benzimidazole derivatives were synthesized by reacting 2-amino benzimidazole and chalcones in n-butanol at reflux temperature. In our present study we have used various heterocyclic chalcones derived from furfural and substituted acetophenones. All synthesized compounds were characterized by IR, 1H NMR and Mass spectroscopy. All synthesized compounds were screened for their antimicrobial activity against gram positive and gram negative bacteria which showed moderate to good activity.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 6; 56-60
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of some new Schiff bases of 2-oxonaphtho[2,1-b][1,4]oxazine
Autorzy:
Chovatiya, P.
Mehta, C.
Senjani, H.
Shah, A.
Joshi, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/411737.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-Oxonaphtho[2,1-b][1,4]oxazine
Schiff base
Opis:
The literature review reveal that [1,4]-oxazine derivatives represent one of the most active classes of compounds possessing wide spectrum of biodynamic activities and use as potent therapeutic agents. In the present work, a series of Schiff base of 2-(2,3-dihydro-2-oxonaphtho[2,1-b][1,4]oxazin-1-yl)acetohydrazide, 5a-5j has been synthesized using 1-aminonaphthalen-2-ol. Various aromatic aldehyde were react with carbohydrazide 4 in the presence of acid to produce the 2-oxonaphtho[2,1-b][1,4]oxazin Schiff base derivatives with good yields. All synthesized compounds were characterized by IR, NMR and Mass spectrometry analysis.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 12; 26-30
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and in vitro antimicrobial evaluation of amine substituted s-triazine based thiazolidinone/chalcone hybrids
Autorzy:
Shah, D. R.
Lakum, H. P.
Chikhalia, K. H.
Powiązania:
https://bibliotekanauki.pl/articles/412622.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antibacterial
Antifungal
Chalcone
s-Triazine
4-thiazolidinone
Opis:
In an attempt to control multidrug resistant dilemma, a library of s-triazine based on two novel series of thiazolidinone (4a-e) and chalcone (7a-e) derivatives were designed and synthesized with simple and efficient etiquette. The newly synthesized compounds were studied for efficacy against several bacteria (Staphylococcus Aureus, Bacillus Cereus, Pseudomonas Aeruginosa, Klebsiella Pneumoniae,) and fungi (Candida Albicans, Aspergillus Clavatus) using the broth dilution technique. Compound 7d was the best bioactive desired antibacterial analogue with less MIC value against different tested strains. Results of bioassay study revealed the future hope of the potent drug-candidate based on s-triazine scaffold. All the final synthesized compounds were characterized by IR, 1 H NMR, 13 C NMR, mass and elemental analysis.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 207-219
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Biological evaluation of 6-substituted-2-(substituted-phenyl)-quinoline derivatives bearing 4-amino-1,2,4-triazole-3-thiol ring at C-4 position
Autorzy:
Vaghasiya, R. G.
Ghodasara, H. B.
Vachharajani, P. R.
Shah, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/412211.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Quinoline, 4-amino-1,2,4-triazole-3-thiol
therapeutic agents
antimicrobial assai
Opis:
Quinoline derivatives represent one of the most active classes of compounds possesses wide spectrum biodynamic activities and use as potent therapeutic agents. In this research work, a synthesis, characterization and biological evaluation of 6-substituted-2-(substituted-phenyl)-quinoline derivatives bearing 4-amino-1,2,4-triazole-3-thiol ring at C-4 position is described. The synthesis of quinoline derivatives is carried out by the reaction of substituted quinoline-4-carbohydrazides with a mixture of carbon disulphide and potassium hydroxide which further react with hydrazine hydrate to give final compounds. All of these compounds were screened for their in vitro antimicrobial assay against gram (+ve), gram (-ve) bacteria and fungi activity compared with standard drugs viz., Ampicilin, Chloramphenicol, Ciprofloxacin, Norfloxacin, Griseofulvin and Nystatin at different concentrations.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 8; 30-37
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Biological evaluation of some newer 5-[6-chloro/fluoro/nitro-2-(p-chloro/ fluoro/ methyl phenyl)-quinolin-4-yl]-1,3,4-oxadiazole-2-thiols
Autorzy:
Faldu, V. J.
Talpara, P. K.
Bhuva, N. H.
Vachharajani, P. R.
Shah, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/412197.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Quinolines
1,3,4-oxadiazole-2-thiols
therapeutic agents
antimicrobial assai
Opis:
Recent study shows that quinolines represent one of the most active classes of compounds possesses wide spectrum biodynamic activities and use as potent therapeutic agents. In present research work, 5-[6-chloro/fluoro/nitro-2-(p-chloro/fluoro/methyl phenyl)-quinolin-4-yl]-1,3,4-oxadiazole-2-thiols have been synthesized by condensation of substituted quinoline-4-carbohydrazides and mixture of carbon disulphide and potassium hydroxide. All of these compounds were screened for their in vitroanti microbial assay against gram (+ve), gram (-ve) bacteria and fungi activity compared with standard drugs viz., Ampicilin, Chloramphenicol, Ciprofloxacin, Norfloxacin, Griseofulvin and Nystatin at different concentrations.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 6; 26-32
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
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