556 research outputs found
Inside Cover: Zinc Oxide–Titania Heterojunction‐based Solid Nanospheres as Photoanodes for Electron‐Trapping in Dye‐Sensitized Solar Cells (Energy Technol. 3/2017)
No full text Hierarchical TiO2/ZnO nanospheres: The cover image shows a schematic of synthesized TiO2 nanospheres and the changes brought about by the incorporation of ZnO. The ZnO/TiO2 nanospheres are aggregates of crystallites of ZnO that are uniformly dispersed over TiO2 to make heterojunctions. This study describes the different doping percentages tested with the optimized value of 1 % showing the best efficiency and the highest porous surface area among the samples. The spherical morphology of the synthesized material provides good light harvesting by efficiently trapping electrons. Moreover, this arrangement leads to increased electron carrier density, leading to highly efficient solar cells. More details can be found in the Full Paper by Kiran P. Shejale, Devika Laishram, Ritu Gupta, and Rakesh K. Sharma from the Indian Institute of Technology Jodhpur on page 489 in Issue 3, 2017 (DOI: 10.1002/ente.201600357). </p
Knowledge Organization Systems for Semantic Digital Libraries
No full textAs the traditional knowledge organization systems (KOS)
like classification, thesauri are paving way for ontologies, transtechnological data models and semantic networks of data exchange
provide impetus for developing semantic digital libraries. This paper
attempts to find the KOS in the early digital libraries, and how they
can be integrated with the digital library architectures using emergent
semantic technologies and data. Metadata remains as a core area at the heart of the Semantic Web and realizing semantics on machines is the challenging task of Web services development. Knowledge representation and organization systems explore nature of metadata and their semantic relationships. This new-breed of social and semantic technologies and their potentialities, approaches for organizing the knowledge on the Web and their enjoining with digital libraries in the light of evolving Semantic Web is highlighted
Theorizing or Negotiating the Law?: A Response to Devika Hovell
No full textDevika Hovell’s article is a very welcome and useful contribution to the debate regarding the “accountability” (whatever the term may mean) of international organizations, and the United Nations in particular. The author argues that scholarship has tended to focus on (descriptive) state practice to the detriment of (normative) theoretical appeal, and so the relevant discussion “has received inadequate theoretical attention.” In response, she sets out to tell the story of the United Nations being held to account through a highly theorized (and, if I may venture even at the outset, perhaps a bit stylized) scheme of contrasting “instrumentalist,” “dignitarian,” and “public interest” approaches to due process. This she applies to two case studies, one regarding targeted sanctions imposed by the UN Security Council, mainly in the context of antiterrorism; and one regarding the cholera outbreak in Haiti, where the United Nations has been implicated. Hovell critiques both the instrumentalist and dignitarian approaches, which correspond in broad terms to legal action at the international, and the domestic/regional level, respectively, and argues in favor of a “public interest” approach as better reflecting a “value-based” due process.</jats:p
Electrochemical Characteristics of BIS 2062 Carbon Steel Under Simulated Ocean Acidification Scenario
No full textDear Professor,I am herewith enclosing a research paper entitled “Electrochemical characteristics of BIS 2062 carbon
steel under simulated ocean acidification scenario.” authored by Devika
KR, and me.
The research
paper highlights the behavior of carbon steel in acidified natural seawater. Ocean acidification is a burning issue under
climate change. Several studies have undertaken to understand the behavior
marine organisms and marine environment. No studies have initiated regarding
the deterioration of materials due to ocean acidification. Large number of materials
were deployed in the ocean with different objectives. These materials are under
risk as the ocean acidification continues. We believe this is the first attempt
to study the impact of ocean acidification on carbon steel.
The study
conducted to evaluate the impact of ocean acidification on BIS 2062 boat
building steel. The results showed that the carbon steel will deteriorate 2 to
3 times higher when pH was changed from 8.05 to 7.90. The data highlights the
immediate need to redesign the marine materials within 1-2 decade. The paper
also highlights the possible mechanism of deterioration under different pH
scenario.Thanking youSincerelyashrafp</div
Diversity in Metadata Schemes used by OAI-PMH Data Providers
No full text'Digital Repositories or Archives’ or ‘Digital Libraries’ use a set of elements to describe the characteristics of each document. This set of elements is called metadata schema. Open Archive Initiative Protocol for Metadata Harvesting (OAI-PMH) evolved as a means to achieve Interoperability among repositories. OAI-PMH mandates the oai_dc schema (based on unqualified Dublin Core) as a minimum standard for interoperability (Lowest Common Denominator).oai_dc is a simple format providing baseline interoperability. It may not be suitable for every repository, service or community to share only oai_dc. Many digital repositories have developed other metadata schemes, as per their specific needs, by extending oai_dc or with completely different set of elements. The author intends to identify all the metadata schemes being used by open access digital repositories with their popularity in terms of instances of their use
Effect of egg yolk extract on proliferation and myogenic differentiation of C2C12 myoblasts
No full textMuscle wasting disorders like atrophy and sarcopenia are characterized by compromised skeletal muscle mass and function. One of the many causes of muscle wasting reported is the failure of satellite cells to fuse and form myofibres. Satellite cells are an integral part of skeletal muscle regeneration because of their self-renewal and differentiation abilities. Muscle regeneration research with respect to satellite cells has stimulated interest in discovering factors that enhance proliferation and differentiation as a first step in the regenerative process. The importance of nutrition in regulating muscle mass and muscle protein synthesis is well established. However, limited literature is available regarding the role of nutrition in muscle regeneration; specifically with respect to satellite cells. As for nutrition, chicken egg yolk appears to be a promising candidate. Egg yolks are rich in nutrients such as vitamins, minerals, amino acids and proteins which can provide sustained supply of nutrition to the cells in-vitro. In the present study, we tested the effect of different fractions and concentrations of egg yolk extract on C2C12 myoblasts. For this purpose, egg yolk extract was supplemented in growth media and cells were grown in this nutrient rich media for one week. Cell viability, fluorescence imaging and mRNA expression of muscle specific genes were analyzed at specific time points of proliferation and differentiation stages of myoblast. The study results showed that supplementation of the egg yolk extract in media enhanced proliferation and differentiation of myoblasts in a dose dependent manner which was analyzed by increase in cell viability, number of nuclei, number of myofibres and mRNA expression of muscle specific genes such as MyoD and myogenin.M.S.Includes bibliographical referencesby Devika Umesh Jogleka
We Listen Together
No full textIn this brief essay, the author responds to a performative panel of essays by students of Devika Chawla. He situates his reading of the event betwixt and between typical modes of performance studies research, demonstrating how the panelists reveal narrative's power to reflect on the layering of time, power and privilege, and ways of knowing.</jats:p
What does a typical full disc around a post-AGB binary look like?
No full textContext. Stable circumbinary discs around evolved post-asymptotic giant branch (post-AGB) binary systems composed of gas and dust show many similarities with protoplanetary discs around young stellar objects. These discs can provide constraints on both binary evolution and the formation of macrostructures within circumstellar discs. Here we focus on one post-AGB binary system: IRAS 08544-4431.
Aims. We aim to refine the physical model of IRAS 08544-4431 with a radiative transfer treatment and continue the near-infrared and mid-infrared interferometric analysis covering the H, K, L, and N bands. Results from geometric modelling of these data in our previous study constrain the shape of the inner rim of the disc and its radial dust structure. We aim to capture the previously detected amount of over-resolved flux and the radial intensity profile at and beyond the inner dust disc rim to put constraints on the physical processes in the inner disc regions.
Methods. We used a three-dimensional Monte Carlo radiative transfer code to investigate the physical structure of the disc by reproducing both the photometry and the multi-wavelength infrared interferometric dataset. We first performed a parametric study to explore the effect of the individual parameters and selected the most important parameters, which were then used in a thorough grid search to fit the structural characteristics. We developed a strategy to identify the models that were best able to reproduce our extensive multi-wavelength dataset.
Results. We find a family of models that successfully fit the infrared photometric and interferometric data in all bands. These models show a flaring geometry with efficient settling. Larger grains are present in the inner disc as probed by our infrared interferometric observations. Some over-resolved flux component was recovered in all bands, but the optimised models still fall short in explaining all the over-resolved flux. This suggests that another dusty structure within the system that is not included in our models plays a role. The structure of this over-resolved component is unclear, but it has a colour temperature between 1400 and 3600 K.
Conclusions. Multi-wavelength infrared interferometric observations of circumstellar discs allow the inner disc regions to be studied in unprecedented detail. The refined physical models can reproduce most of the investigated features, including the photometric characteristics, the radial extent, and the overall shape of the visibility curves. Our multi-wavelength interferometric observations combined with photometry show that the disc around IRAS 08544-4431 is similar to protoplanetary discs around young stars with similar dust masses and efficient dust growth. The resulting disc geometry is capable of reproducing part of the over-resolved flux, but to fully reproduce the over-resolved flux component, an additional component is needed. Multi-scale high-angular-resolution analysis combining VLTI, VLT/SPHERE, and ALMA data is needed to fully define the structure of the system.sponsorship: FWO|G097619N, FWO|1281121Nstatus: Publishe
Morley Type Virtual Element Method for Von K\'{a}rm\'{a}n Equations
No full textThis paper analyses the nonconforming Morley type virtual element method to
approximate a regular solution to the von K\'{a}rm\'{a}n equations that
describes bending of very thin elastic plates. Local existence and uniqueness
of a discrete solution to the non-linear problem is discussed. A priori error
estimate in the energy norm is established under minimal regularity assumptions
on the exact solution. Error estimates in piecewise and norm are
also derived. A working procedure to find an approximation for the discrete
solution using Newtons method is discussed. Numerical results that justify
theoretical estimates are presented.Comment: 23 pages, 6 figures, 6 tables Submitted to a journa
Low-cost and nontoxic highly rectifying diodes using p-type tin monosulfide (SnS) thin films and Ti/Au binary contacts
No full textEco-friendly and efficient rectifying p-n diodes have been developed by using cost-effective and non-toxic fin monosulfide (SnS) thin films. Chemically stoichiometric fin monosulfide (SnS) thin films followed by titanium/gold (Ti/Au) bilayer contacts were deposited on Si substrates and then, the structures were treated by rapid thermal annealing process (RTP) at different temperatures. The impact of RTP treatment on the surface morphology and chemical composition of Ti/Au contacts and SnS films along with their electrical characteristics were investigated. The electrical measurements show that as compared to untreated Si/SnS/Ti/Au structures, the heat-treated structures typically at 200 degrees C possess low electrical resistivity and contact resistance of similar to 3 x 10(-2) Omega cm and similar to 11 k Omega, respectively. Heterojunction formed between p-SnS and n-Si exhibited excellent diode characteristics and possess a high current flow in the order of milliamperes, and excellent rectification factor of 1177@ 5 V
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