811 research outputs found
Flame retardant coating on cotton fabric with phosphorus containing polymeric film by admicellar polymerization
In this study, 2-methacryloyloxyethyl phosphorylcholine monomer has been polymerized using azobis-isobutyronitrileinitiator on the surface of cotton fabric by admicellar polymerization with the assistance of anionic surfactant(dodecylbenzenesulphonic acid sodium salt) along with NaCl as electrolyte. The polymeric film formed on cotton surfacehas been characterized by FTIR and SEM. FTIR spectrum shows additional bands at 1720 cm-1 (C=O str.), 1258 cm-1(P=O str.) and 1078 cm-1 (P ̶ O ̶ C str.) of phosphorus based polymer formed on cotton fabric. Thermal behaviour innitrogen atmosphere is also studied which shows that onset temperature of degradation of treated cotton fabric decreases by37 ºC and char yield increases by 21.7% at 600 ºC. The burning behaviour of treated cotton fabric is investigated by 45º autoflammability and limiting oxygen index tests. The pure cotton fabric burns the entire length of 15 cm sample in 11.8 s buttreated cotton fabric self-extinguishes in auto flammability test. The durability of treated cotton fabric has also been studiedup to two home launderings
Salaried Strata Investment Behavior Towards Financial Products-review and Prospects for Future Research
The financial surface of the globe at all times reveals a weirdly balanced impact of the public investment preferences, their understanding of the investment requirements, their anticipation of returns on their investments etc. Perhaps forecasting the growth of the business world would be crucial without an opposite comprehension of the investment behavior of the key part of the society called salaried class. This paper covers appraisal of various financial instruments like equity/stocks, term deposits in banks, kisan vikas patra, national savings certificate, insurance policies, mutual fund and converse the factors persuading investment decision process. The major factors influencing the financial investment behavior are demographic factors (like age, income, qualification, gender, etc.) and socio-economic factors (like family income, tax benefits, the safety of fund, risk inclination, return on investment). This study aims to serve a channel to the need for a comprehension of the financial objectives of the salaried class investors with that of their determined desire for the investment returns. Certainly, this information could unwrap the prospect of predicting even the future of Indian Economy itself besides, providing span to fine-tuning the investment prudence of the public towards progressive and fruitful choices for themselves and the nation
Magnetic moments of the low-lying , resonances within the framework of the chiral quark model
The magnetic moments of the low-lying spin-parity ,
resonances, like, for example, ,
, as well as their transition magnetic moments, are
calculated using the chiral quark model. The results found are compared with
those obtained from the nonrelativistic quark model and those of unitary chiral
theories, where some of these states are generated through the dynamics of two
hadron coupled channels and their unitarization
Semi-leptonic Octet Baryon Weak Axial-Vector Form Factors in the Chiral Constitutent Quark Model
The weak vector and axial-vector form factors have been investigated for the
semi-leptonic octet baryon decays in the chiral constituent quark model with
configuration mixing (\chiCQM_{config}). The effects of SU(3) symmetry breaking
and configuration mixing have also been investigated and the results are not
only in good agreement with existing experimental data but also show
improvement over other phenomenological models.Comment: 5 pages, 2 tables. Presented at the 18th International Spin Physics
Symposium, University of Virginia, USA, October 6-11, 200
Constraining Unparticles from Top Physics at TeVatron
We study and analyze the recent observations of the top pair production
at TeVatron through flavor conserving and flavor
violating channels vector and tensor unparticles. The unparticle
sector is considered with the possibility of being a color singlet or octet.
The modified unparticle propagator is used to investigate the contribution of
these unparticles to the observed (forward backward
asymmetry in top pair production) and the spin correlation at TeVatron. We have
also studied the impact of the flavor violating couplings of unparticles to the
third generation quarks on (a) pair production of same sign tops/antitops
at TeVatron and (b) the partial top
decay width for .
We find that a large region of parameter space is consistent with the
measurements of \tt production cross-section, \afbt and spin correlation
coefficient at TeVatron and observe that the top decay width measurement
constrains the flavor violating coupling of vector unparticles more severely
than the same sign top/antitop production at TeVatron. We also predict the best
point-set in the model parameter space for specific choices of \du
corresponding to evaluated using the \mttb spectrum of \afbt
from the data set of Run II of TeVatron at the integrated luminosity 8.7
fb. Our results and analysis are consistent even with unparticle
theories having broken scale invariance as long as the infrared cut-off scale
is much less than the top pair production threshold.Comment: 37 pages, 24 figures, 1 new figure and some discussions added,
references updated, to appear in Physical Review
Nucleon spin densities in a light-front constituent quark model
The first moment of longitudinal and transverse spin densities of quarks in
the nucleon are calculated in a light-front constituent quark model for the
different cases of quark and nucleon polarization. Significant distortions are
found for the transverse spin densities. In particular the Sivers function is
predicted with opposite sign for up and down quarks and the Boer-Mulders
function is predicted large and negative for both up and down quarks, in
agreement with lattice calculations. Quite a different spin distribution is
obtained for up and down quarks in the cases of quarks and proton transversely
or longitudinally polarized in the same direction.Comment: one reference added; to be published in Phys. Lett.
Fingerprint-enhanced capacitive-piezoelectric flexible sensing skin to discriminate static and dynamic tactile stimuli
nspired by the structure and functions of the human skin, a highly sensitive capacitive‐piezoelectric flexible sensing skin with fingerprint‐like patterns to detect and discriminate between spatiotemporal tactile stimuli including static and dynamic pressures and textures is presented. The capacitive‐piezoelectric tandem sensing structure is embedded in the phalange of a 3D‐printed robotic hand, and a tempotron classifier system is used for tactile exploration. The dynamic tactile sensor, interfaced with an extended gate configuration to a common source metal oxide semiconductor field effect transistor (MOSFET), exhibits a sensitivity of 2.28 kPa−1. The capacitive sensing structure has nonlinear characteristics with sensitivity varying from 0.25 kPa−1 in the low‐pressure range (<100 Pa) to 0.002 kPa−1 in high pressure (≈2.5 kPa). The output from the presented sensor under a closed‐loop tactile scan, carried out with an industrial robotic arm, is used as latency‐coded spike trains in a spiking neural network (SNN) tempotron classifier system. With the capability of performing a real‐time binary naturalistic texture classification with a maximum accuracy of 99.45%, the presented bioinspired skin finds applications in robotics, prosthesis, wearable sensors, and medical devices
Elastomer-based touch sensor: Visualization of tactile pressure distribution
© Springer Nature Switzerland AG 2019. This paper presents an elastomer-based tactile sensor that can sense the tactile information in the form of pressure distribution. Our proposed sensor uses a piece of coated elastomer with thin conical pins underneath as the touch medium. The elastomer consists of 91 pins arranged in a honeycomb pattern, each pin can be regarded as a tactile sensing element. They are spaced at 1.5 mm in x and y direction. Each tactile element transfers the applied pressure value into a circular image pattern which can be captured by a camera placed at the end of the sensor structure. The applied pressure over the sensing array can be computed by processing the area of each sensing element. MATLAB is used to process the received images relating the applied pressure to the activated pixels in each circular pattern of the tactile element, and further visualizing the pressure distribution on a reconstructed surface of the sensor. This paper presents the development principle and fabrication process of the proposed sensor. The experimental results have proven the viability of the sensing concept; the prototype sensor can effectively detect single-point touch caused by objects with different dimensions and multi-point touch interactions with a spacing of more than 2.5 mm
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