427 research outputs found
PHYSICAL APPEARANCE OF Cd-SUBSTITUTED COBALT FERRITE NANOPARTICLES
Objective: Ferrites are an important class of magnetic materials and the most important property of ferrite is its high electrical resistivity, low eddy current, and dielectric losses. The nanostructured ultrafine samples of the ferrite series are prepared by using the Sol-Gel auto combustion method. The prepared samples were characterized by X-ray diffraction (XRD) and Scanning Electron Micrograph (SEM) techniques. X-ray analysis confirms the formation of a single-phase cubic spinel structure.
Materials and Methods: A series of polycrystalline nano ferrite having the chemical formula Co1-xCdxFe2O4 (where, x= 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared by using Sol-Gel auto combustion method. The starting materials cobalt nitrate (Co(NO3)2·6H2O), ferric nitrate (Fe(NO3)2·9H2O), Cadmium nitrate (Cd(NO3)2·9H2O), citric acid (C6H8O7·H2O) and ammonia (NH3) solution were taken in 99.9% AR grade.
Results: In the Co1-xCdxFe2O4 ferrite system, the lattice constant, hopping length (LA and LB) and A-site (A-O) and B-site (B-O) bond length of the samples has been increased due to the increase in cadmium content. The crystalline size of the samples lies in the range between 18nm to 33nm calculated by using Sherrer’s formula
Conclusion: Nanaosized Co1-xCdxFe2O4 system was synthesized by using the sol-gel technique
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Carbon Sequestration in Reclaimed Mined Soils of Ohio
This research project is aimed at assessing the soil organic carbon (SOC) sequestration potential of reclaimed mine soils (RMS). The experimental sites were characterized by distinct age chronosequences of reclaimed mine soil and were located in Guernsey, Morgan, Noble, and Muskingum Counties of Ohio. These sites are owned and maintained by American Electrical Power. These sites were reclaimed (1) with topsoil application, and (2) without topsoil application, and were under continuous grass or forest cover. This report presents the results from two forest sites reclaimed with topsoil application and reclaimed in 1994 (R94-F) and in 1973 (R73-F), and two forest sites without topsoil application and reclaimed in 1969 (R69-F) and 1962 (R62-F). Results from one site under grass without topsoil application and reclaimed in 1962 (R62-G) are also shown. Three core soil samples were collected from each of the experimental sites and each landscape position (upper, middle and lower) for 0-15 and 15-30 cm depths, and saturated hydraulic conductivity (Ks), volumes of transport (VTP) pores, and available water capacity (AWC) were determined. No significant differences were observed in VTP and AWC in 0-15 cm and 15-30 cm depths among the sites R94-F and R73-F reclaimed with topsoil application and under continuous forest cover (P<0.05). VTP and AWC did also not differ among upper, middle and lower landscape positions. However, saturated hydraulic conductivity in 0-15 cm depth at R73-F was significantly lower at the lower compared to the upper landscape position. No significant differences were observed for Ks among landscape positions at R94-F. No significant differences were observed in VTP and AWC among landscape positions and depths within R69-F, R62-F and R62-G. However, saturated hydraulic conductivity was higher in 0-15 cm depth at R62-F than at R69-F and R62-G. At the latter site, Ks was higher in the upper compared to the lower landscape position whereas Ks did not differ among landscape positions at the other sites. Statistical analyses indicated that the number of random samples taken was probably not sufficient to properly consider distribution of VTP and AWC in 0-15 cm and 15-30 cm depths across the sites, in particular for the sites without topsoil application
Certain subclasses of multivalent functions defined by new multiplier transformations
In the present paper the new multiplier transformations
\mathrm{{\mathcal{J}% }}_{p}^{\delta }(\lambda ,\mu ,l) (\delta ,l\geq
0,\;\lambda \geq \mu \geq 0;\;p\in \mathrm{% }%\mathbb{N} )} of multivalent
functions is defined. Making use of the operator two new subclasses and \textbf{\ }of multivalent analytic
functions are introduced and investigated in the open unit disk. Some
interesting relations and characteristics such as inclusion relationships,
neighborhoods, partial sums, some applications of fractional calculus and
quasi-convolution properties of functions belonging to each of these subclasses
and
are
investigated. Relevant connections of the definitions and results presented in
this paper with those obtained in several earlier works on the subject are also
pointed out
Tight-binding parameters for charge transfer along DNA
We systematically examine all the tight-binding parameters pertinent to
charge transfer along DNA. The molecular structure of the four DNA bases
(adenine, thymine, cytosine, and guanine) is investigated by using the linear
combination of atomic orbitals method with a recently introduced
parametrization. The HOMO and LUMO wavefunctions and energies of DNA bases are
discussed and then used for calculating the corresponding wavefunctions of the
two B-DNA base-pairs (adenine-thymine and guanine-cytosine). The obtained HOMO
and LUMO energies of the bases are in good agreement with available
experimental values. Our results are then used for estimating the complete set
of charge transfer parameters between neighboring bases and also between
successive base-pairs, considering all possible combinations between them, for
both electrons and holes. The calculated microscopic quantities can be used in
mesoscopic theoretical models of electron or hole transfer along the DNA double
helix, as they provide the necessary parameters for a tight-binding
phenomenological description based on the molecular overlap. We find that
usually the hopping parameters for holes are higher in magnitude compared to
the ones for electrons, which probably indicates that hole transport along DNA
is more favorable than electron transport. Our findings are also compared with
existing calculations from first principles.Comment: 15 pages, 3 figures, 7 table
Plant and algal chlorophyll synthases function in Synechocystis and interact with the YidC/Alb3 membrane insertase
In the model cyanobacteriumSynechocystissp. PCC 6803, the terminalenzyme of chlorophyll biosynthesis, chlorophyll synthase (ChlG), forms acomplex with high light-inducible proteins, the photosystem II assembly fac-tor Ycf39 and the YidC/Alb3/OxaI membrane insertase, co-ordinatingchlorophyll delivery with cotranslational insertion of nascent photosystempolypeptides into the membrane. To gain insight into the ubiquity of thisassembly complex in higher photosynthetic organisms, we produced functionalforeign chlorophyll synthases in a cyanobacterial host. Synthesis of algal andplant chlorophyll synthases allowed deletion of the otherwise essential nativecyanobacterial gene. Analysis of purified protein complexes shows that theinteraction with YidC is maintained for both eukaryotic enzymes, indicatingthat a ChlG-YidC/Alb3 complex may be evolutionarily conserved in algaeand plants
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Measurement of Bottom versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations in p+p Collisions at sqrt(s)=200 GeV
The momentum distribution of electrons from semi-leptonic decays of charm and
bottom for mid-rapidity |y|<0.35 in p+p collisions at sqrt(s)=200 GeV is
measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC)
over the transverse momentum range 2 < p_T < 7 GeV/c. The ratio of the yield of
electrons from bottom to that from charm is presented. The ratio is determined
using partial D/D^bar --> e^{+/-} K^{-/+} X (K unidentified) reconstruction. It
is found that the yield of electrons from bottom becomes significant above 4
GeV/c in p_T. A fixed-order-plus-next-to-leading-log (FONLL) perturbative
quantum chromodynamics (pQCD) calculation agrees with the data within the
theoretical and experimental uncertainties. The extracted total bottom
production cross section at this energy is \sigma_{b\b^bar}= 3.2
^{+1.2}_{-1.1}(stat) ^{+1.4}_{-1.3}(syst) micro b.Comment: 432 authors, 6 pages text, 3 figures. Submitted to Phys. Rev. Lett.
Plain text data tables for the points plotted in figures for this and
previous PHENIX publications are (or will be) publicly available at
http://www.phenix.bnl.gov/papers.htm
Evidence Map of Pancreatic Surgery–A living systematic review with meta-analyses by the International Study Group of Pancreatic Surgery (ISGPS)
Background: Pancreatic surgery is associated with considerable morbidity and, consequently, offers a large and complex field for research. To prioritize relevant future scientific projects, it is of utmost importance to identify existing evidence and uncover research gaps. Thus, the aim of this project was to create a systematic and living Evidence Map of Pancreatic Surgery. Methods: PubMed, the Cochrane Central Register of Controlled Trials, and Web of Science were systematically searched for all randomized controlled trials and systematic reviews on pancreatic surgery. Outcomes from every existing randomized controlled trial were extracted, and trial quality was assessed. Systematic reviews were used to identify an absence of randomized controlled trials. Randomized controlled trials and systematic reviews on identical subjects were grouped according to research topics. A web-based evidence map modeled after a mind map was created to visualize existing evidence. Meta-analyses of specific outcomes of pancreatic surgery were performed for all research topics with more than 3 randomized controlled trials. For partial pancreatoduodenectomy and distal pancreatectomy, pooled benchmarks for outcomes were calculated with a 99% confidence interval. The evidence map undergoes regular updates. Results: Out of 30, 860 articles reviewed, 328 randomized controlled trials on 35, 600 patients and 332 systematic reviews were included and grouped into 76 research topics. Most randomized controlled trials were from Europe (46%) and most systematic reviews were from Asia (51%). A living meta-analysis of 21 out of 76 research topics (28%) was performed and included in the web-based evidence map. Evidence gaps were identified in 11 out of 76 research topics (14%). The benchmark for mortality was 2% (99% confidence interval: 1%–2%) for partial pancreatoduodenectomy and <1% (99% confidence interval: 0%–1%) for distal pancreatectomy. The benchmark for overall complications was 53% (99%confidence interval: 46%–61%) for partial pancreatoduodenectomy and 59% (99% confidence interval: 44%–80%) for distal pancreatectomy. Conclusion: The International Study Group of Pancreatic Surgery Evidence Map of Pancreatic Surgery, which is freely accessible via www.evidencemap.surgery and as a mobile phone app, provides a regularly updated overview of the available literature displayed in an intuitive fashion. Clinical decision making and evidence-based patient information are supported by the primary data provided, as well as by living meta-analyses. Researchers can use the systematic literature search and processed data for their own projects, and funding bodies can base their research priorities on evidence gaps that the map uncovers. © 2021 The Author
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