Inhomogeneous vortex-state-driven enhancement of superconductivity in nanoengineered ferromagnet-superconductor heterostructures

Thin film heterostructures provide a powerful means to study the antagonism between superconductivity (SC) and ferromagnetism (FM). One interesting issue in FM-SC hybrids which defies the notion of antagonistic orders is the observation of magnetic field induced superconductivity (FIS). Here we show that in systems where the FM domains/islands produce spatial inhomogeneities of the SC order parameter, the FIS can derive significant contribution from different mobilities of the magnetic flux identified by two distinct critical states in the inhomogeneous superconductor. Our experiments on nanoengineered bilayers of ferromagnetic CoPt and superconducting NbN where CoPt/NbN islands are separated by a granular NbN, lend support to this alternative explanation of FIS in certain class of FM-SC hybrids.Comment: 5 figure

Analysis of the Early-time Optical Spectra of SN 2011fe in M101

The nearby Type Ia supernova (SN Ia) SN 2011fe in M101 (cz = 241 km s^(–1)) provides a unique opportunity to study the early evolution of a "normal" SN Ia, its compositional structure, and its elusive progenitor system. We present 18 high signal-to-noise spectra of SN 2011fe during its first month beginning 1.2 days post-explosion and with an average cadence of 1.8 days. This gives a clear picture of how various line-forming species are distributed within the outer layers of the ejecta, including that of unburned material (C+O). We follow the evolution of C II absorption features until they diminish near maximum light, showing overlapping regions of burned and unburned material between ejection velocities of 10,000 and 16,000 km s^(–1). This supports the notion that incomplete burning, in addition to progenitor scenarios, is a relevant source of spectroscopic diversity among SNe Ia. The observed evolution of the highly Doppler-shifted O I λ7774 absorption features detected within 5 days post-explosion indicates the presence of O I with expansion velocities from 11,500 to 21,000 km s^(–1). The fact that some O I is present above C II suggests that SN 2011fe may have had an appreciable amount of unburned oxygen within the outer layers of the ejecta

A single molecule switch based on two Pd nanocrystals linked by a conjugated dithiol

Tunneling spectroscopy measurements have been carried out on a single molecule device formed by two Pd nanocrystals (dia, $\sim$5 nm) electronically coupled by a conducting molecule, dimercaptodiphenylacetylene. The I-V data, obtained by positioning the tip over a nanocrystal electrode, exhibit negative differential resistance (NDR) on a background M-I-M characteristics. The NDR feature occurs at $\sim$0.67 V at 300 K and shifts to a higher bias of 1.93 V at 90 K. When the tip is held in the middle region of the device, a coulomb blockade region is observed ($\pm\sim$0.3 V).Comment: Accepted in Praman

Review on QA Performance Improvement using Multimedia Techniques

CQA (Community question Answering) which is the record of millions of question and answer which is created. CQA user to provide a rich resources of information which is missing at Web Search Engine and to automate and enhanced the process of locating the high-quality answer question at a CQA.CQA archived the question that are matched by the CQA system with respect to QA which significantly minimizes the user time and efforts involved in searching for answer to Question. CQA forum usually provide only the textual answer which are not enough for many question. In this paper, we propose a scheme that will be able to enrich textual answer in CQA with appropriate using of media data. In this project our scheme consists of 3 components such as the Answer Medium Selection, The Query Generation for Multimedia, The Multimedia data Selection and Presentation. In this our approach is to automatically determine which type of the media information can be added to enrich the textual answer. In this by processing for large datasets QApair and adding them to a pool, in this our approach as a user’s can find multimedia question answer (MMQA) by matching their questions with those in the pool. Different from a lot of multimedia QA research efforts that attempt to directly answer the question with Image and Video data. In this our approach is built based on Community Contributed Textual Answer and can deal with more complex questions. In this we have also conducted extensive experiment on a multi-source QA datasets there the result Demonstrate the effectiveness of our approach DOI: 10.17762/ijritcc2321-8169.15081