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Tytuł:
Applicability of artificial intelligence in smart healthcare systems for automatic detection of Parkinson’s Disease
Autorzy:
Pallathadka, Harikumar
Padminivalli V., S.J.R.K.
Vasavi, M.
Nancy, P.
Naved, Mohd
Kumar, Harish
Ray, Samrat
Powiązania:
https://bibliotekanauki.pl/articles/38709253.pdf
Data publikacji:
2024
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
Parkinson’s disease
detection
machine learning
relief algorithm
LDA algorithm
SVM-RBF
accuracy
sensitivity
specificity
choroba Parkinsona
wykrywanie
nauczanie maszynowe
algorytm ulgi
Algorytm LDA
dokładność
wrażliwość
specyficzność
Opis:
Parkinson’s disease is associated with memory loss, anxiety, and depression in the brain. Problems such as poor balance and difficulty during walking can be observed in addition to symptoms of impaired posture and rigidity. The field dedicated to making computers capable of learning autonomously, without having to be explicitly programmed, is known as machine learning. An approach to the diagnosis of Parkinson’s disease, which is based on artificial intelligence, is discussed in this article. The input for this system is provided through photographic examples of Parkinson’s disease patient handwriting. Received photos are preprocessed using the relief feature option to begin the process. This is helpful in the process of selecting characteristics for the identification of Parkinson’s disease. After that, the linear discriminant analysis (LDA) algorithm is employed to reduce the dimensions, bringing down the total number of dimensions that are present in the input data. The photos are then classified via radial basis function-support vector machine (SVM-RBF), k-nearest neighbors (KNN), and naive Bayes algorithms, respectively.
Źródło:
Computer Assisted Methods in Engineering and Science; 2024, 31, 2; 175-185
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different drying treatments on the physicochemical, functional, and antioxidant properties of Bacopa monnieri
Autorzy:
Padhiari, B.M.
Ray, A.
Jena, S.
Champati, B.B.
Sahoo, A.
Halder, T.
Ghosh, B.
Panda, P.C.
Nayak, S.
Powiązania:
https://bibliotekanauki.pl/articles/2096812.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bacopa monnieri (L.) Wettst
bacoside A
bacopaside I
drying treatments
DPPH assay
HPLC
FT-IR
Opis:
Bacopa monnieri (L.) Wettst is a very high-value medicinal plant that is commonly used for improving cognitive functions. However, the availability of very limited information on the drying method of B. monnieri has prompted to optimize a suitable drying method. The present study therefore aimed to evaluate the influence of the following six drying treatments on the quality of B. monnieri sample: microwave drying at 300 W and 600 W, hot air-drying at 50EC and 70EC, solar drying, and freeze-drying (FD). The quality attributes of the dried samples were comparatively analyzed in terms of color, total color difference, moisture content, water activity (a w), antioxidant activity, and bacoside A and bacopaside I content. The results of this study showed significant differences (P < 0.05) among the different drying methods in International Commission on Illumination (CIE) parameters, namely lightness index (L*), red-green index (a*), and yellow-blue index (b*), ΔE and a w values. Among the samples dried with the six drying methods, freeze-dried B. monnieri samples had an attractive color with the lowest total color difference value (11.415%), a w value (0.15%), and maximum bacoside A (3.389%) and bacopaside I (0.620%) content. Moreover, Fourier transform infrared spectroscopy (FT-IR) analysis showed no major difference in the functional groups in B. monnieri samples processed by the different drying methods. Considering the retention of quality after drying, FD was found to be very effective for future large-scale production of good quality dried B. monnieri products.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 4; 399-409
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of putative miRNAs from expressed sequence tags of Gnetum gnemon L. and their cross-kingdom targets
Autorzy:
Krishnatreya, D.B.
Ray, D.
Baruah, P.M.
Dowarah, B.
Bardoloi, K.S.
Agarwal, H.
Agarwala, N.
Powiązania:
https://bibliotekanauki.pl/articles/2096394.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microRNAs
expressed sequence tags
cross-kingdom
Gnetum gnemon
Opis:
Wild edible plants are often found to be rich sources of nutrients and medicinally beneficial compounds with pharmacological activities. Gnetum gnemon is a nutritionally important plant and a popular food source in parts of Assam and North-East India. Various microRNAs (miRNAs) have been recently identified in many plants; however, there are no records of identification of miRNAs in any species of Gnetum. The prediction of miRNA-target associations in G. gnemon is an important step to facilitate functional genomics studies in this species. In the present study, all known miRNAs from plants available in public domain were used to search for the conserved G. gnemon miRNA homologues in publicly accessible expressed sequence tags (ESTs) in NCBI database. An aggregate of 20 new potential miRNAs belonging to two diverse miRNA families (miR399 and miR5021) were identified through a homology-based search by following stringent filtering criteria. To investigate the potential cross-kingdom effects of the identified miRNAs, we further identified the putative target genes of G. gnemon miRNAs in human transcriptome and analyzed them against the NCBI non-redundant protein database. The KEGG analysis of the target genes indicated that these genes were involved in different metabolic pathways such as caffeine metabolism, drug metabolism, and nitrotoluene degradation. The target genes of G. gnemon miRNAs in humans were found to be associated with various disorders of both hereditary and non-hereditary origin. These results could help to shed new light on understanding of miRNA-mRNAs functional networks in this species and its potential use as a small RNA-based therapy against some human diseases.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 2; 179-195
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homotopy simulation of non-Newtonian Spriggs fluid flow over a flat plate with oscillating motion
Autorzy:
Ray, A. K.
Vasu, B.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/265238.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ nieściśliwy
przepływy Stokes'a
płyn nienewtonowski
incompressible flow
oscillatory plate
Stokes second problem
HAM
non-Newtonian Spriggs fluid
Opis:
An incompressible flow of a non-Newtonian Spriggs fluid over an unsteady oscillating plate is investigated using the Homotopy Analysis Method (HAM). An analytic solution of sine and cosine oscillations of the plate has been obtained. The similarity transformation is introduced to reduce the governing partial differentia equations into a single non-linear dimensionless partial differential equation. The effects of the power index of Spriggs fluid and convergence control parameter of HAM for the flow are studied extensively. The range of the convergence control parameter for convergence of series solution for different values of the power index of Spriggs fluid is obtained. The solution for a Spriggs fluid is noticeably different from the solution obtained for a Newtonian fluid. The influences of the shear thinning and shear thickening fluid on the velocity profile are shown graphically. The transient flow effect is higher for non-Newtonian Spriggs fluid than that of a Newtonian fluid. It is also observed that the interval to reach the steady state for the cosine case is less than the sine case. The applications of Stokes’ second problem have been widely found in the variety of fields of biomedical, medical, chemical, micro and nanotechnology.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 359-385
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water wave scattering by an infinite step in the presence of an ice-cover
Autorzy:
Ray, S.
De, S.
Mandal, B. N.
Powiązania:
https://bibliotekanauki.pl/articles/265982.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fala wodna
pokrywa lodowa
aproksymacja Galerkina
water wave scattering
ice cover
infinite step
integral equation
Galerkin approximation
reflection and transmission coefficients
Opis:
The classical problem of water wave scattering by an infinite step in deep water with a free surface is extended here with an ice-cover modelled as a thin uniform elastic plate. The step exists between regions of finie and infinite depths and waves are incident either from the infinite or from the finite depth water region. Each problem is reduced to an integral equation involving the horizontal component of velocity across the cut above the step. The integral equation is solved numerically using the Galerkin approximation in terms of simple polynomial multiplied by an appropriate weight function whose form is dictated by the behaviour of the fluid velocity near the edge of the step. The reflection and transmission coefficients are obtained approximately and their numerical estimates are seen to satisfy the energy identity. These are also depicted graphically against thenon-dimensional frequency parameter for various ice-cover parameters in a number of figures. In the absencje of ice-cover, the results for the free surface are recovered.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 157-168
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Blending Methodologies on Cotton Mélange Yarn Quality
Wpływ metod mieszania na jakość melanżowych przędz bawełnianych
Autorzy:
Ray, S.
Ghosh, A.
Banerjee, D.
Powiązania:
https://bibliotekanauki.pl/articles/233799.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
blow room blending
draw frame blending
fibre breakage
melange yarn
shade depth
yarn quality
mieszanie
rozdmuchiwanie
przeciąganie
łamanie włókien
przędza melanżowa
głębokość odcienia
jakość przędzy
Opis:
Fibre of dyed mélange yarn is becoming an emerging product in the field of textiles. The quality of mélange yarn is largely influenced by the types of blending methodologies. There exists hardly any reported work where the effect of blending methods on cotton mélange yarn quality has been studied. The purpose of this paper is to investigate the effect of blending methodologies on the properties of cotton mélange spun yarn. Dyed and grey cotton fibre components were mixed at the blow room and draw frame stages separately to produce mélange yarns with three different shade depths (%). Better yarn quality with respect to yarn evenness, imperfections, tenacity, elongation at break and hairiness index was achieved with the draw frame blending methodology as compared to the blow room blending methodology. The mélange yarn quality deteriorates with an increase in shade depth (%) for both blending methodologies.
Włókna z barwionej przędzy melanżowej stają się obecnie znaczącym produktem w obszarze produkcji tekstyliów. Na jakość przędzy melanżowej w dużej mierze wpływają rodzaje metod mieszania. Niewiele jest doniesień na temat wpływu metody mieszania na jakość przędz bawełnianych. Celem artykułu było zbadanie wpływu metod mieszania na właściwości przędzionej przędzy z mieszanki bawełny. Włókna bawełniane mieszano tak, aby wytworzyć melanżowe włókna o trzech różnych głębokościach odcieni (%). Oceniono jakość przędzy w odniesieniu do równomierności przędzy, niedoskonałości, wytrzymałości na rozciąganie, wydłużenia przy zerwaniu i wskaźnika włochatości. Stwierdzono, że jakość przędzy melanżowej pogarsza się wraz ze wzrostem głębi koloru (%) niezależnie od wybranej metody mieszania.
Źródło:
Fibres & Textiles in Eastern Europe; 2018, 5 (131); 41-46
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First report of twig blight of ban tulsi (Croton bonplandianus Bail.) caused by Choanephora cucurbitarum (Berk.and Ravenel) Thaxt. in India
Autorzy:
Das, S.
Dutta, S.
Ray, S.K.
Powiązania:
https://bibliotekanauki.pl/articles/65731.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
twig blight
ban tulsi
Croton bonplandianus
Euphorbiaceae
herb
perennial plant
folk medicine
Choanephora cucurbitarum
plant pathogen
sporangium
India
Opis:
In August 2015, twig blight disease of ban tulsi (Croton bonplandianus Bail.) caused by Choanephora cucurbitarum (Berk. & Ravenel) Thaxt. was observed for the first time, in the Gangetic alluvial region of West Bengal, India. A severe disease incidence (40–50%) showed twig blight symptoms starting with shoot apical meristem (SAM), leaf, and blossom blight symptoms. Typical symptoms were characterized by over-projecting black pin head like emerging sporangiola which formed mycelial cushion on the infected surface. The present report describes the identification of the causal pathogen as C. cucurbitarum based on its morphology and the internal transcribed spacer of its ribosomal DNA (rDNA – ITS) sequences with 100% identity of NCBI-GenBank published Choanephora database. Optimum temperatures, 28–30°C, coupled with high relative humidity (80–90%) during the monsoon season enhances the disease’s progress. To the best of our knowledge this is the first report of twig blight of C. bonplandianus, caused by C. cucurbitarum, in India as well as globally.
Źródło:
Journal of Plant Protection Research; 2017, 57, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of roguing and insecticide spraying on mosaic disease in Jatropha curcas
Autorzy:
Al-Basir, F.
Roy, P. K.
Ray, S.
Powiązania:
https://bibliotekanauki.pl/articles/205846.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Jatropha curcas
mosaic disease
roguing
spraying
Hopf bifurcation
optimal control problem (OCP)
Opis:
Jatropha curcas plant is greatly impaired by mosaic disease, caused by the viruses (Begomovirus), transmitted by whiteflies, which act as the vector. Roguing (i.e. removal of infected plant) and spraying of insecticides are common methods, employed in order to get rid of the disease. In this article, a mathematical model has been developed to study the mosaic disease dynamics while considering preventive measures of roguing and insecticide spraying. Sufficient conditions for the stability of equilibrium points of the system are among the results obtained through qualitative analysis. We obtain the basic reproduction number R0 and show that the disease free system is stable for R0 < 1 and unstable for R0 > 1. The region of stability of equilibrium points in different parameter spaces have also been analysed. Hopf bifurcation at the endemic steady state has been studied subsequently, as well. Finally, by formulating an optimal control problem, optimal application of roguing and spraying techniques has been determined, keeping in mind the cost effective control of the mosaic disease. Pontryagin minimum principle has been utilized to solve the optimal control problem. Numerical simulations illustrate the validity of the analytical outcomes.
Źródło:
Control and Cybernetics; 2017, 46, 4; 325-344
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Different quality characteristics of tomato (Solanum lycopersicum) as a fortifying ingredient in food products: a review
Autorzy:
Ray, S.
Saha, R.
Raychaudhuri, U.
Chakraborty, R.
Powiązania:
https://bibliotekanauki.pl/articles/297809.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
tomato
nutritional benefit
bioactive components
lycopene
application
preservation
Opis:
Tomato (Solanum lycopersicum) is an economically important vegetable crop grown in tropical and sub-tropical parts of the world. The objective of this paper is to review nutritional benefits of tomato, its different bioactive components and their application in food products. Tomato and tomato products are very beneficial to our health as they decrease the risk of many diseases, such as cancer, asthma, heart disease etc. The whole fruit of tomato i.e pomace, seed and tomato solids have many nutraceutical benefits and is extensively used in food processing industry either as raw or in powder form. Many bioactive components are present in tomato, such as lycopene, oleoresin, carotenoids etc. Tomato is very popular for high content of antioxidant compounds and antioxidant activity. It is preserved mainly by drying (tray drying, freeze drying) and encapsulation process. We have tried to focus on to get the answer, which one is better in food application, lycopene supplementation or direct tomato powder fortification in food products.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(3); 199-213
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of biomarker with special reference to antioxidant level in blood as occupational exposure of sewage and garage workers
Autorzy:
Basu, R.
Talapatra, S.N.
Mukhopadhyay, A.
Ray, S.S.
Chakrabarti, P.
Chaudhuri, U.
Chakrabarti, S.
Powiązania:
https://bibliotekanauki.pl/articles/11257.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
assessment
biomarker
special reference
antioxidant level
blood
occupational exposure
sewage
garage
worker
waste water
human blood
Opis:
The present study deals with the estimation of antioxidant levels in blood of sewage and garage workers exposed to sewage water, washing water and vehicular air pollution compared with control group of population. The study areas were selected on the basis of drainage clearance and wards where workers are active as sewage workers. For garage workers, the garage selected was a large and busy one where continuous vehicles washing, repairing etc are carried out. These two exposed groups were compared to non-exposed group of population as control. The blood samples were collected from two groups of exposed population as well as control population and the antioxidant levels were estimated in blood. The present results clearly indicate that there was decreasing trend of the antioxidant level in blood for sewage and garage workers. In the control groups of population the antioxidant levels were found to be within normal range, but for sewage workers (0.14-0.36 mM) and garage workers (0.12-0.36 mM) the antioxidant levels were significantly lower. The range of antioxidant level in human blood is 0.5 to 2.0 mM. It was found to be significantly lower (P < 0.001 or 0.05) in addicted sewage and garage workers when compared with non-addicted groups. All the exposed groups were showed to be having significantly lower antioxidant level when compared to control groups. This study is a preliminary assessment to know the potent biomarkers for oxidative stress and estimation of antioxidant level in blood due to occupational exposure. This study shows a way for easy screening of biomarker assessment but further work is needed in relation to biochemical, enzymological and genetic damage study.
Źródło:
International Letters of Natural Sciences; 2014, 09
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of self-heating susceptibility of Indian coal seams – a neural network approach
Ocena skłonności pokładów węgla w Indiach do samozapłonu – podejście oparte o wykorzystanie sieci neuronowych
Autorzy:
Panigrahi, D. C.
Ray, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/219076.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metoda badania potencjału utleniającego w procesie mokrym
samozapłon
badanie korelacji
sztuczne sieci neuronowe
temperatura przejścia
wet oxidation potential
spontaneous heating
correlation studies
artificial neural network analysis
CPT
Opis:
The paper addresses an electro-chemical method called wet oxidation potential technique for determining the susceptibility of coal to spontaneous combustion. Altogether 78 coal samples collected from thirteen different mining companies spreading over most of the Indian Coalfields have been used for this experimental investigation and 936 experiments have been carried out by varying different experimental conditions to standardize this method for wider application. Thus for a particular sample 12 experiments of wet oxidation potential method were carried out. The results of wet oxidation potential (WOP) method have been correlated with the intrinsic properties of coal by carrying out proximate, ultimate and petrographic analyses of the coal samples. Correlation studies have been carried out with Design Expert 7.0.0 software. Further, artificial neural network (ANN) analysis was performed to ensure best combination of experimental conditions to be used for obtaining optimum results in this method. All the above mentioned analysis clearly spelt out that the experimental conditions should be 0.2 N KMnO4 solution with 1 N KOH at 45°C to achieve optimum results for finding out the susceptibility of coal to spontaneous combustion. The results have been validated with Crossing Point Temperature (CPT) data which is widely used in Indian mining scenario.
W pracy omówiono możliwości wykorzystania metody elektro-chemicznej zwanej metodą określania potencjału utleniającego w procesie mokrym do określania skłonności węgla do samozapłonu. Dla potrzeb eksperymentu zebrano 78 próbek węgla z trzynastu kopalni w obrębie Indyjskiego Zagłębia Węglowego. Przeprowadzono 936 eksperymentów, w różnych warunkach prowadzenia procesu aby zapewnić standaryzację metody w celu jej szerszego zastosowania. Dla każdej próbki przeprowadzono 12 eksperymentów metodą badania potencjału utleniającego w procesie mokrym. Wyniki skorelowano z własnościami danego węgla przez przeprowadzenie badania petrograficznych i wytrzymałościowych parametrów węgla. Procedurę korelacji wykonano z wykorzystaniem oprogramowania Design Expert 7.0.0, następnie przeprowadzono analizę z wykorzystaniem sieci neuronowych w celu opracowania najkorzystniejszej kombinacji warunków eksperymentu do wykorzystania dla uzyskania optymalnych wyników. Badania wykazały, że najkorzystniejsze warunki dla procesu to zastosowanie roztworu 0.2 N KMnO4 z 1 N KOH przy 45°C dla uzyskania optymalnych wyników określania skłonności pokładów do samozapłonu. Walidację wyników przeprowadzono w oparciu o wyniki badania metodą określania temperatury przejścia (Crossing Point Temperature), szeroko stosowaną w przemyśle wydobywczym w Indiach.
Źródło:
Archives of Mining Sciences; 2014, 59, 4; 1061-1076
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elevated strontium concentration in the blood of automobile workers in Kolkata
Autorzy:
Basu, R.
Mukhopadhyay, A.
Ray, S.S.
Chakrabarti, P.
Ram, S.S.
Sudarshan, M.
Chakrabarti, S.
Powiązania:
https://bibliotekanauki.pl/articles/1916666.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Strontium
garage workers
blood
Energy Dispersive X-ray Fluorescence Technique
Opis:
Introduction: Though the trace element strontium’s (Sr) exact role in health remains unknown, at certain levels, it is toxic and, given the body’s low threshold for Sr, has been cited to cause nervous disorders. At different stages of the life cycle, organisms vary in their ability to discriminate Sr and calcium, which can cause age-related differences in gastrointestinal absorption. Though data regarding the effects of such absorption remain limited, it can reportedly impact health, the immune system, and chromosomal aberration. Purpose: To investigate and correlate levels of Sr concentration and any health problems at certain levels among automobile workers. Materials and methods: The blood of 41 automobile workers and 26 healthy controls of the Kolkata region was collected and whole blood Sr concentration estimated by the energy dispersive X-ray fluorescence (EDXRF) technique. Results: Automobile workers showed significantly (p <0.001) higher blood SR levels than controls from the same area, despite similar dietary habits and drinking-water quality. Conclusions: Automobile workers are exposed to different pollutants that can harm their health, and a trace element imbalance of Sr and its elevated concentrations in the blood may cause different health complications.
Źródło:
Progress in Health Sciences; 2014, 4, 2; 186-189
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Population Loss in Closed Optical Transitions οf Rb and Cs Atoms Confined in Micrometric Thin Cells
Autorzy:
Biancalana, V.
Cartaleva, S.
Dancheva, Y.
Gosh, P.
Mariotti, E.
Mitra, S.
Moi, L.
Petrov, N.
Ray, B.
Sarkisyan, D.
Slavov, D.
Powiązania:
https://bibliotekanauki.pl/articles/1791199.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.30.-r
32.70.Jz
Opis:
We present the first experimental observation of narrow dips in the fluorescence profiles of completely closed hyperfine transitions in Rb vapor at high atomic density, which is attributed to the depolarization of the excited state. Moreover, at low atomic density, a narrow peak on the top of the fluorescence profile is demonstrated, centered at the completely closed transition within the $D_{2}$ line of Cs. Experiments are performed in thin (700 μm) alkali cell by single light beam spectroscopy. The cell is filled with Cs containing a small portion of Rb.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 495-497
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machining performance optimization of Parallel Kinematic Machines tools with regard to their anisotropic behaviour
Autorzy:
Pateloup, S.
Bonnemains, T.
Chanal, H.
Bouzgarrou, B. C.
Duc, E.
Ray, P.
Powiązania:
https://bibliotekanauki.pl/articles/1429122.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
parallel kinematic machine too
kinematic model
static model
tool path optimization
Opis:
Today, Parallel Kinematic Machines tools (PKMs) appear in automotive and aeronautic industries. These machines allow a benefit of productivity due to their higher kinematics performances than Serial Kinematic Machines tools (SKMs). However, their machining accuracy is lower. Moreover, the compensation of the defects which penalizes the machined parts quality is difficult due to their anisotropic behaviour. Thus, this article deals with the development of methods improving the machined parts quality and the productivity. In order to improve parts quality, the static behaviour of the machine structure is considered with a model taking into account joints and legs compliances. Then, it allows determining a static workspace. About the productivity, the improvement of kinematics performances is performed through an optimization work of the non productive tool path between cutting operations. The computed tool path must verify a minimum time constraint and avoid collisions between the tool and the machined part. All the methods are illustrated with the PKM Tripteor X7 developed by PCI.
Źródło:
Journal of Machine Engineering; 2008, 8, 4; 13-24
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health Risks From Exposure to Metal-Working Fluids in Machining and Grinding Operations
Autorzy:
Li, K.
Aghazadeh, F.
Hatipkarasulu, S.
Ray, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/90609.pdf
Data publikacji:
2003
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
machining safety
cutting fluid hazards
occupational illnesses
occupational cancer
metal working
obróbka metali
obróbka skrawaniem
ocena ryzyka zawodowego
zagrożenia zdrowia
szkodliwe czynniki fizyczne
choroba zawodowa
nowotwory
Opis:
Metal-working fluids (MWFs) are used in machining and grinding operations to cool the tool and work, reduce the friction between the tool and work, improve the surface integrity of the work piece, and increase tool life and productivity. Health problems have been reported among workers exposed to MWFs, including incidences of respiratory, digestive and skin cancers, and increased rates of cough and phlegm. This paper reviews and discusses issues concerning health risks from exposure to MWFs in machining and grinding operations, the various factors that influence the degree of exposure, and control methods to reduce exposure to metal-working fluids.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2003, 9, 1; 75-95
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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