1,525 research outputs found
Towards flexible asymmetric MSM structures using Si microwires through contact printing
This paper presents development of flexible metal-semiconductor-metal devices using silicon (Si) microwires. Monocrystalline Si in the shape of microwires are used which are developed through standard photolithography and etching. These microwires are assembled on secondary flexible substrates through a dry transfer printing by using a polydimethylsiloxane stamp. The conductive patterns on Si microwires are printed using a colloidal silver nanoparticles based solution and an organic conductor i.e. poly (3,4-ethylene dioxthiophene) doped with poly (styrene sulfonate). A custom developed spray coating technique is used for conductive patterns on Si microwires. A comparative study of the current–voltage (I–V) responses is carried out in flat and bent orientations as well as the response to the light illumination of the wires is explored. Current variations as high as 17.1 μA are recorded going from flat to bend conditions, while the highest I on/I off ratio i.e. 43.8 is achieved with light illuminations. The abrupt changes in the current response due to light-on/off conditions validates these devices for fast flexible photodetector switches. These devices are also evaluated based on transfer procedure i.e. flip-over and stamp-assisted transfer printing for manipulating Si microwires and their subsequent post-processing. These new developments were made to study the most feasible approach for transfer printing of Si microwires and to harvest their capabilities such as photodetection and several other applications in the shape of metal-semiconductor-metal structures
Parton Distributions in Impact Parameter Space
Fourier transform of the generalized parton distributions (GPDs) at zero
skewness with respect to the transverse momentum transfer gives the
distribution of partons in the impact parameter space. We investigate the GPDs
as well as the impact parameter dependent parton distributions (ipdpdfs) by
expressing them in terms of overlaps of light front wave functions (LFWFs) and
present a comparative study using three different model LFWFs.Comment: 13 pages, 6 figure
POSFET tactile sensing arrays using CMOS technology
This work presents fabrication and evaluation of novel POSFET (Piezoelectric Oxide Semiconductor Field Effect Transistor) devices based tactile sensing chip. In the newer version presented here, the tactile sensing chip has been fabricated using CMOS (Complementary Metal Oxide Semiconductor) technology. The chip consists of 4 x 4 POSFET touch sensing devices (or taxels) and both, the individual taxels and the array are designed to match spatio–temporal performance of the human fingertips. To detect contact events, the taxels utilize the contact forces induced change in the polarization level of piezoelectric polymer (and hence change in the induced channel current of MOS). The POSFET device on the chip have linear response in the tested dynamic contact forces range of 0.01–3 N and the sensitivity (without amplification) is 102.4 mV/N
Extracting the Omega- electric quadrupole moment from lattice QCD data
The Omega- has an extremely long lifetime, and is the most stable of the
baryons with spin 3/2. Therefore the Omega- magnetic moment is very accurately
known. Nevertheless, its electric quadrupole moment was never measured,
although estimates exist in different formalisms. In principle, lattice QCD
simulations provide at present the most appropriate way to estimate the Omega-
form factors, as function of the square of the transferred four-momentum, Q2,
since it describes baryon systems at the physical mass for the strange quark.
However, lattice QCD form factors, and in particular GE2, are determined at
finite Q2 only, and the extraction of the electric quadrupole moment, Q_Omega=
GE2(0) e/(2 M_Omega), involves an extrapolation of the numerical lattice
results. In this work we reproduce the lattice QCD data with a covariant
spectator quark model for Omega- which includes a mixture of S and two D states
for the relative quark-diquark motion. Once the model is calibrated, it is used
to determine Q_Omega. Our prediction is Q_Omega= (0.96 +/- 0.02)*10^(-2) efm2
[GE2(0)=0.680 +/- 0.012].Comment: To appear in Phys. Rev. D. Version with small modifications. 8 pages,
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Effect of water dipping on separation techniques of pomegranate (Punica granatum L.) arils
For easy separation of arils, pomegranate fruits were subjected to hot water dipping and normal water dipping treatments. Minimum time of separation as 4.10 min/kg of fruit was observed in case of hot water (80±2°C) dip for 2 min which was at par with hot water (80±2°C) dip for 1 min as 4.7 min/kg. All treatments saved time over the traditional method but only hot water dipping was significant without any significant adverse effect on aril quality in comparison with traditional method except anthocyanin and phenols. Anthocyanin content reduced and phenols content increased in comparison to traditional method
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
Benchmarking the Interactions among Challenges for Blockchain Technology Adoption:A Circular Economy Perspective
The chances of food contamination and spoilage get enhanced as it passes through various stages, and prudent consumers often need transparency on the origin of food products, their production and processing facilities utilized. Blockchain, an emerging digital technology, offers food traceability solutions to consumers and supply chain partners. But presently, blockchain adoption in Indian supply chains is in the nascent stages. The present study identified the challenges of adopting blockchain technology in Indian food supply chains and modelled them using Interpretive Structural Modelling (ISM). As per the ISM, the ‘regulatory structure’ and ‘lack of realised need’ emerged as the most significant driving forces that impact other challenges, viz. ‘privacy breach issues’, ‘high costs’, ‘lack of skills’, ‘lack of technology’, ‘lack of trust’ and ‘lack of infrastructure’. These challenges have an impact on the ‘scalability problem’. The paper underlines the significance of enabling regulatory structure, improved information and communication technologies infrastructure, and convincing the supply chain stakeholders to use blockchain technology to resolve the underlying challenges and achieve its adoption and scalability in the Indian food industry.<br/
Asymptotic and oscillatory behavior of solutions of differential equations with advanced arguments
Tactile Sensing for Robotic Applications
This chapter provides an overview of tactile sensing in robotics. This chapter is an attempt
to answer three basic questions:
\u2022 What is meant by Tactile Sensing?
\u2022 Why Tactile Sensing is important?
\u2022 How Tactile Sensing is achieved?
The chapter is organized to sequentially provide the answers to above basic questions.
Tactile sensing has often been considered as force sensing, which is not wholly true. In order
to clarify such misconceptions about tactile sensing, it is defined in section 2. Why tactile
section is important for robotics and what parameters are needed to be measured by tactile
sensors to successfully perform various tasks, are discussed in section 3. An overview of
`How tactile sensing has been achieved\u2019 is given in section 4, where a number of
technologies and transduction methods, that have been used to improve the tactile sensing
capability of robotic devices, are discussed. Lack of any tactile analog to Complementary
Metal Oxide Semiconductor (CMOS) or Charge Coupled Devices (CCD) optical arrays has
often been cited as one of the reasons for the slow development of tactile sensing vis-\ue0-vis
other sense modalities like vision sensing. Our own contribution \u2013 development of tactile
sensing arrays using piezoelectric polymers and involving silicon micromachining - is an
attempt in the direction of achieving tactile analog of CMOS optical arrays. The first phase
implementation of these tactile sensing arrays is discussed in section 5. Section 6 concludes
the chapter with a brief discussion on the present status of tactile sensing and the challenges
that remain to be solved
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