110 research outputs found
Understanding the use of peers for mental health care: A meta-synthesis of qualitative evidence
No full textSupplementary files associated with "
Ahmad I, Hanif M, Waqas A, Suleman N, Atif N, Bibi A, Zulfiqar S, Khan A, Ali B, Kayani SS, Khan SA, Sikander S. Understanding the use of peers for mental health care: A meta-synthesis of qualitative evidence. 2022. f1000research."</p
Effect of Nigella sativa fixed and essential oils on antioxidant status, hepatic enzymes, and immunity in streptozotocin induced diabetes mellitus
No full textBackground: Nigella sativa fixed (NSFO) and essential (NSEO) oils have been used to treat diabetes mellitus and its
complications. Present study was undertaken to explore and validate these folkloric uses.
Methods: Sprague dawley rats having streptozotocin (STZ) induced diabetes mellitus were used to assess the role
of NSFO and NSEO in the management of diabetes complications. Parameters investigated were antioxidant
potential, oxidative stress, and the immunity by in vivo experiments.
Results: The results indicated that STZ decreased the glutathione contents (25.72%), while NSFO and NSEO
increased the trait significantly (P < 0.05). Experimental diets increased the tocopherol contents (P < 0.01) and
enhanced the expression of hepatic enzymes (P < 0.01). Correlation matrix further indicated that antioxidant
potential is positively associated (P < 0.05) responsible for the modulation of hepatic enzymes and the decrease of
the nitric oxide production thus controlling the diabetes complications.
Conclusions: Overall, results of present study supported the traditional use of N. sativa and its derived products as
a treatment for hyperglycemia and allied abnormalities. Moreover, N. sativa fixed and essential oils significantly
ameliorate free radicals and improve antioxidant capacity thus reducing the risk of diabetic complications
Studies on the magnetic, magnetostrictive and electrical properties of sol–gel synthesized Zn doped nickel ferrite
No full textStudies on the magnetic, magnetostrictive and electrical properties of sol-gel synthesized Zn doped nickel ferrite
M. Atifa, Corresponding Author Contact Information, E-mail The Corresponding Author, M. Nadeemb, R. Grössingera, R. Sato Turtellia
a Institut für Festkörperphysik, Technische Universität Wien, Wiedner Hauptstrasse 8-10, A-1040 Vienna, Austria
b EMMG, Physics Division, PINSTECH, P.O. Nilore, Islamabad, Pakistan
Received 28 December 2010; revised 24 February 2011; Accepted 27 February 2011. Available online 5 March 2011.
Abstract
Zinc doped nickel ferrite i.e., Ni1−xZnxFe2O4 (0 ≤ x ≤ 0.6) have been prepared by using sol-gel method. X-ray diffraction of these samples shows the presence of single-phase cubic spinel structure. The room temperature magnetic measurements showed that saturation magnetization (Ms) increases with the substitution of Zn2+ ions up to x = 0.4 and thereafter it begins to decrease, whereas magnetostriction (λ) value decreases with the addition of Zn2+ in the Ni-Zn ferrite. Dielectric permittivity (ɛ′), dielectric loss tangent (tan δ) and AC conductivity (σAC) for all the prepared samples have been studied as a function of frequency and composition in the range from 0.05 Hz to 10 MHz at room temperature. It has been observed that initially ɛ′, tan δ and σAC decreases with the substitution of Zn2+ up to x = 0.4 and then increases with the further addition of Zn2+ ions. Variation in the slope parameter s with zinc contents indicates the presence of different type of conduction mechanism in different compositions. The dielectric loss curves exhibit relaxation peaks which shift with the addition of Zn contents. The results have been explained on the basis of space charge polarization according to Maxwell-Wagner's two-layer model and the hopping of charges between Fe2+ and Fe3+ as well as between Ni3+ and Ni2+ ions at the octahedral sites
A Novel Modified Switched Inductor Boost Converter with Reduced Switch Voltage Stress
No full textRecently, switched inductor (SI) and switched capacitor techniques in dc-dc converter are recommended to achieve high voltage by using the principle of parallel charging and series discharging of reactive elements. It is noteworthy that four diodes, one high-voltage rating switch, and two inductors are required to design classical SI boost converter (SIBC). Moreover, in classical SIBC, the switch voltage stress is equal to the output voltage. In this article, modified SIBC (mSIBC) is proposed with reduced voltage stress across active switches. The proposed mSIBC configuration in this article is transformerless and simply derived by replacing the one diode of the classical SI structure with an active switch. As a result, mSIBC required low-voltage rating active switches, since the total output voltage is shared into two active switches. Moreover, the proposed mSIBC is low in cost, provides higher efficiency, and requires the same number of components compared with the classical SIBC. The continuous conduction mode and discontinuous conduction mode analysis, the effect of nonidealities on voltage gain, design methodology, and comparison are presented in detail. The operation and performance of the designed 500-W mSIBC are experimentally validated under different perturbations.Manuscript received July 14, 2019; revised October 15, 2019 and December 13, 2019; accepted January 3, 2020. Date of publication February 5, 2020; date of current version October 30, 2020. This work was supported by Qatar University High Impact under Grant QUHI-CENG-19/20-2, from the Qatar University. The publication charges are funded by the Qatar National Library. The statements made herein are solely the responsibility of the authors. (Corresponding author: Atif Iqbal.) S. Sadaf, M. Meraj, A. Iqbal, and N. Al-Emadi are with the Department of Electrical Engineering, Qatar University, Doha 2713, Qatar (e-mail: [email protected]; [email protected]; [email protected]; [email protected]).Scopu
Lit@EVE: Explainable Recommendation based on Wikipedia Concept Vectors
No full textThe European Conference on Machine Learning & Principles and Practice of Knowledge Discovery in Databases (ECML PKDD), Skopje, Macedonia 18-22 SeptemberWe present an explainable recommendation system for novels and authors,called Lit@EVE, which is based on Wikipedia concept vectors. In this system,each novel or author is treated as a concept whose definition is extractedas a concept vector through the application of an explainable word embeddingtechnique called EVE. Each dimension of the concept vector is labelled as eithera Wikipedia article or a Wikipedia category name, making the vector representationreadily interpretable. In order to recommend items, the Lit@EVE systemuses these vectors to compute similarity scores between a target novel or authorand all other candidate items. Finally, the system generates an ordered list of suggesteditems by showing the most informative features as human-readable labels,thereby making the recommendation explainable.Science Foundation IrelandInsight Research Centr
Conventional and hybrid B
No full textUsing our analytical expressions that well model the lattice simulations of the gluonic excitations, we use the extended quark potential model to study the effects of orbital and radial excitations on the masses and sizes of conventional and hybrid mesons. A non relativistic formalism is used to numerically calculate the wave functions using the shooting method; this also allows us to calculate the E1 , M1 radiative partial widths for conventional meson to meson and hybrid to hybrid transitions. We incorporate spin mixing and compare our calculated spectrum and decay widths with the available experimental masses and the theoretically predicted spectra and decay widths by other groups. Our results can help consider both conventional and hybrid quantum numbers for mesons as experimental results become available
Bottomonium meson spectrum with quenched and unquenched quark models
No full textAn open question in hadronic phenomenology concerns the “unquenching” effects of higher Fock space components on the leading Fock space description of hadrons. We address this by making a comparison of the bottomonium spectrum as computed with the relativized Godfrey–Isgur quark model and an unquenched coupled channel model driven by the “” mechanism of hadronic decay. Our results show that both models can describe the spectrum well, indicating that the influence of coupled channel effects can be largely absorbed into the parameters of the quenched quark model. This conclusion is reinforced by a perturbative calculation that shows that the spin-dependence of mass splittings due to mixing with the continuum recapitulates quenched quark model spin-dependent interactions. We also show that softening of the quark-antiquark wavefunction due to continuum mixing improves the description of vector bottomonium decay constants. Together, these results illustrate and substantiate the surprising robustness of simple constituent quark model descriptions of hadrons
Neutral pion to two-photons transition form factor revisited
No full textBased upon a combined formalism of Schwinger-Dyson and Bethe-Salpeter equations in quantum chromodynamics (QCD), we propose a QCD kindred algebraic model for the dressed quark propagator, for the Bethe-Salpeter amplitude of the pion and the electromagnetic quark-photon interaction vertex. We then compute the transition form factor for a wide range of photon momentum transfer squared . The quark propagator is expanded out in its perturbative functional form but with dynamically generated dressed quark mass. It has complex conjugate pole singularities in the complex-momentum plane which is motivated by the solution of the quark gap equation with rainbow-ladder truncation of the infinite set of Schwinger-Dyson equations. This complex pole singularity structure of the quark propagator can be associated with a signal of confinement which prevents quarks to become stable asymptotic states. The Bethe-Salpeter amplitude is expressed without a spectral density function, which encapsulate its low and large momentum behaviour. The QCD evolution of the distribution amplitude is also incorporated into our model through the direct implementation of Efremov-Radyushkin-Brodsky-Lepage evolution equations. We include the effects of the quark anomalous magnetic moment in the description of the quark-photon vertex whose infrared enhancement is known to dictate hadronic properties. Once the QCD kindred model is constructed, we calculate the form factor and find it consistent with direct QCD-based studies as well as most available experimental data. It slightly exceeds the conformal limit for large which might be attributed to the scaling violations in QCD. The associated interaction radius and neutral pion decay width turn out to be compatible with experimental data.11 pages, 4 figure
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