This paper considers the effect of mass transfer on free convective flow and heat transfer of a viscous incompressible electrically conducting fluid past a vertical porous plate through a porous ...medium with time dependant permeability and oscillatory suction in presence of a transverse magnetic field and heat source. The solutions for velocity field, temperature field and concentration distribution are obtained using perturbation technique. The effects of the flow parameters such as magnetic parameter
M, Grashof number for heat and mass transfer
G
r
,
G
c
, porosity parameter
K
p
, Prandtl number
P
r
, Schmidt number
S
c
, frequency parameter
ω
and heat source parameter
S on the velocity, temperature and concentration distribution of the flow field and the skin friction, heat flux and the rate of mass transfer are studied analytically and presented with the aid of figures and tables. It is observed that the magnetic parameter and the Schmidt number retard the velocity of the flow field while the Grashof number for heat and mass transfer, the porosity parameter and the heat source parameter have accelerating effect on the velocity of the flow field at all points. Further, the Prandtl number reduces the temperature and the Schmidt number diminishes the concentration distribution of the flow field at all points. The skin friction coefficients
τ
0
and
τ
increase due to increase in
G
r
,
G
c
and
K
p
while decrease due to increase in
S
c
,
M,
ω
and
P
r
. Further, the rate of mass transfer
S
h
increases due to increase in
S
c
while an increase in
ω
results a decrease in
S
h
.
In the framework of relativistic mean field theory, we study the effect of nonlinear cross coupling between the isoscalar-vector and isovector-vector mesons on top of G2 parametrization. The energy ...and pressure densities are calculated over a wide range of baryon densities. The observables such as symmetry energy and related coefficients are also evaluated systematically. The effect of cross coupling on the symmetry energy of symmetric nuclear matter is studied. The work is further extended to β-equilibrium matter to estimate the mass and radius of neutron stars and also to the baryon octet to see the effect of coupling over the equation of state.
The developmental rapidity of nanotechnology poses higher risks of exposure to humans and the environment through manufactured nanomaterials. The multitude of biological interfaces, such as DNA, ...proteins, membranes, and cell organelles, which come in contact with nanoparticles, is influenced by colloidal and dynamic forces. Consequently, the ensued nano-bio interface depends on dynamic forces, encompasses many cellular absorption mechanisms along with various biocatalytic activities, and biocompatibility that needs to be investigated in detail. Addressing the issue, the study offers a novel green synthesis strategy for antibacterial AgNPs with higher biocompatibility and elucidates the mechanistic
in vivo
biocompatibility of silver nanoparticles (AgNPs) at the cellular and molecular levels. The analysis ascertained the biosynthesis of G-AgNPs with the size of 25 ± 10 nm and zeta potential of −29.2 ± 3.0 mV exhibiting LC50 of 47.2 μg mL
−1
in embryonic zebrafish. It revealed the mechanism as a consequence of abnormal physiological metabolism in oxidative stress and neutral lipid metabolism due to dose-dependent interaction with proteins such as he1a, sod1, PEX protein family, and tp53 involving amino acids such as arginine, glutamine and leucine leading to improper apoptosis. The research gave a detailed insight into the role of diverse AgNPs-protein interactions with a unique combinatorial approach from first-principles density functional theory and
in silico
analyses, thus paving a new pathway to comprehending their intrinsic properties and usage.
Molecular biocompatibility of AgNP is mediated through channelized intrinsic AgNP-proteins interaction in steatosis and apoptosis.
Introduction and Background: This study was conducted to know the spectrum and number of bone and soft tissue (BST) tumors presenting to our institute. We needed to assess the gap between the number ...of patients seen and infrastructure available, and based on this information, help formulate guidelines for optimum utilization of resources and to provide best possible evidence-based cancer care. Settings And Designs: This is a prospective observational study (epidemiological). Materials and Methods: This study included all new patients seen in BST-disease management group (DMG) in the year 2010. An audit form was devised to capture all the relevant information. A comparison of our data with other national and international studies was also done. Results: Out of total 31,951 new patients registered at our institute, 2007 patients availed BST-DMG services. Sixty percent were bone tumors and 36% were soft tissue tumors. In bone tumor, 66% were malignant, 15% were benign, and 19% were non-neoplastic. Osteosarcoma (43%) was the most common malignant tumor followed by primitive neuroectodermal tumor/Ewing's (27%) and chondrosarcoma (11%). Giant cell tumor was the most common benign bone tumor. Eighty-one percent of all soft tissue lesions were malignant, of which 75% were of mesenchymal origin and 25% were of cutaneous origin. Conclusion: This is an attempt to document the epidemiology of musculoskeletal tumors presenting to our institution while guiding the institute to frame and implement disease-specific protocols and generate further research questions. Continued data collection and follow-up can provide valuable information on long-term survival and treatment-related toxicities. This data (within limitations) may be extrapolated to national level to identify the need for infrastructure and human resources.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Effect of CaO on ferroelectric, dielectric, piezoelectric properties of Barium Zirconate Titanate (BZT) lead free piezo ceramics was studied. The powders were prepared by mixed-oxide route, calcined ...at 1000°C for 4 h. XRD patterns of the calcined powders show phase pure perovskite structure. The calcined powders were de-agglomerated, granulated, pressed into pellets and sintered at 1150°C for 3 h. Scanning Electron Microscopy (SEM) studies of thermally etched sintered pellets show sub-micron sized grains for undoped BZT which increases up to 5-8 μm sized for 0.015 mol CaO doped BZT. Energy Dispersive X-ray analysis (EDS) of CaO doped BZT sample confirms the presence of dopants very close to their stoichiometric compositions. The piezoelectric charge constant (d
33
= 248 pC/N), dielectric constant (K = 2521) and remnant polarization (P
r
= 4.22 μC/cm
2
) were maximum for BZT samples containing 0.015 mole of CaO.
•Magnetoimpedance (MI) of amorphous FeCoBM (M = B, Al, Si,Cu) ribbons are investigated exclusively.•Metalloid B/Si stabilizes amorphous phase, whereas Al/Cu resists the hard magnetic ...phase.•Enhancement of MI on Cu adddition is associated with its improved magnetic softness.•Triple peak MI curve is due to typical balance between the domain wall motion and domain rotation.•Deterioration of MI in FeCoBAl is validated through numerical simulations.
In this work magnetic properties, magnetoimpedance (MI) and field sensitivity (η) of rapidly solidified (Fe0.7Co0.3)80B19M1 (M = B, Al, Si & Cu) ribbons have been investigated in the frequency range 0.5 – 13 MHz. Present study shows replacement of boron (B) by a nonmagnetic element (Al, Si or Cu) can alter the thermal stability, soft magnetic and magnetoimpedance properties of the (Fe0.7Co0.3)80B20 ribbons. It is found that saturation magnetization reaches the largest value for Cu-containing sample and the smallest value for Al-containing sample. The MI studies show maximum MI ratios 30% at 5 MHz, 23% at 7 MHz, 26% at 3 MHz and 39% at 4 MHz for M = B, Al, Si & Cu respectively. Variation of MI with external magnetic field shows single peak behavior of Al-content ribbon over the entire frequency range, whereas for all other samples single peak converted to double peak at higher frequency, which indicates existence of stronger longitudinal magnetic anisotropy in Al-containing ribbon. The MI variation with magnetization, M and damping constant, α is also validated through numerical simulations using standard electrodynamics models. Present study reveals that the variations of MI response are associated with formation of soft magnetic phase and development of anisotropy with replacement of B by an additional element.
Mixing and warming of cryogenic hydrogen releases Hecht, Ethan S.; Panda, Pratikash P.
International journal of hydrogen energy,
04/2019, Letnik:
44, Številka:
17
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
Laboratory measurements were made on the concentration and temperature fields of cryogenic hydrogen jets. Images of spontaneous Raman scattering from a pulsed planar laser sheet were used to measure ...the concentration and temperature fields from varied releases. Jets with up to 5 bar pressure, with near-liquid temperatures at the release point, were characterized in this work. This data is relevant for characterizing unintended leaks from piping connected to cryogenic hydrogen storage tanks, such as might be encountered at a hydrogen fuel cell vehicle fueling station. The average centerline mass fraction was observed to decay at a rate similar to room temperature hydrogen jets, while the half-width of the Gaussian profiles of mass fraction were observed to spread more slowly than for room temperature hydrogen. This suggests that the mixing and models for cryogenic hydrogen may be different than for room temperature hydrogen. Results from this work were also compared to a one-dimensional (streamwise) model. Good agreement was seen in terms of temperature and mass fraction. In subsequent work, a validated version of this model will be exercised to quantitatively assess the risk at hydrogen fueling stations with cryogenic hydrogen on-site.
•Novel planar laser Raman imaging used to measure cryogenic hydrogen concentration.•Radial profiles of hydrogen temperature and concentration are Gaussian.•Centerline concentration decays at a similar rate as for room temperature hydrogen.•Data shows good agreement to integral model.
Recent advancement in nanotechnology seeks exploration of new techniques for improvement in the molecular, chemical, and biological properties of nanoparticles. In this study, carbon modification of ...octahedral-shaped magnetic nanoparticles (MNPs) was done using two-step chemical processes with sucrose as a carbon source for improvement in their electrochemical application and higher molecular biocompatibility. X-ray diffraction analysis and electron microscopy confirmed the alteration in single-phase octahedral morphology and carbon attachment in Fe3O4 structure. The magnetization saturation and BET surface area for Fe3O4, Fe3O4/C, and α-Fe2O3/C were measured as 90, 86, and 27 emu/g and 16, 56, and 89 m2/g with an average pore size less than 7 nm. Cyclic voltammogram and galvanostatic charge/discharge studies showed the highest specific capacitance of carbon-modified Fe3O4 and α-Fe2O3 as 213 F/g and 192 F/g. The in vivo biological effect of altered physicochemical properties of Fe3O4 and α-Fe2O3 was assessed at the cellular and molecular level with embryonic zebrafish. Mechanistic in vivo toxicity analysis showed a reduction in oxidative stress in carbon-modified α-Fe2O3 exposed zebrafish embryos compared to Fe3O4 due to despaired influential atomic interaction with sod1 protein along with significant less morphological abnormalities and apoptosis. The study provided insight into improving the characteristic of MNPs for electrochemical application and higher biological biocompatibility.
Display omitted
•Carbon modification of octahedral shaped magnetic nanoparticles (MNPs) was done using sucrose.•The magnetization saturation and BET for Fe3O4, Fe3O4/C and α-Fe2O3/C was 90, 86, 27 emu/g and 16, 56, 89 m2/g.•Carbon modified α-Fe2O3 induce less ROS in exposed zebrafish embryos.•Carbon modified Fe3O4 despair influential atomic interaction with zebrafish Sod1 protein.•Carbon modified Fe3O4 exhibit less morphological abnormalities and apoptosis.
India’s Capital Cusp in US–China Tensions PANDA, JAGANNATH P; SARKAR, MRITTIKA GUHA
Journal of Indian and Asian studies (Online),
01/2020, Letnik:
1, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The intensifying trade war between the United States and China has been the focal point of geoeconomics as well as geopolitics, in the purview of the current times. Trump’s unilateral trade tariffs ...imposed on China and the latter’s retaliation with further duties against the United States has jostled the global trade chains, which has had repercussions beyond the two largest economies. Furthermore, while the G20 summit in Osaka witnessed the US and China returning to the negotiating table to end the tariffs and the Phase One deal between both the countries provided some amnesty, the tensions are much deeper rooted and are far from being resolved. However, as the implications of the trade war move beyond the stratagem of the US–China tug-of-war, many countries like India maneuver through the tussle to find a delicate equilibrium between national interests and global power politics. In this regard, this paper tends to analyze India’s perspective towards the trade war, arguing that New Delhi is taking a non-confrontational, measured approach to surpass the fluid international affairs; in a way that is letting New Delhi shape its decisions on the basis of its national interests and concerns, rather than taking sides.
The core part of current model is to analyze the entropy generation and 2-dimensional unsteady stagnation flow with suction/injection constraint present in the boundary. Further, the induced magnetic ...field has applied with this flow model, which is formed by the motion of fluid that conducts electrically. The time-dependent partial differential equations (PDE) of the recent model are first converted to non-linear ordinary differential equations (ODE) using suitable similarity variables. We obtain solutions numerically using inbuilt shooting technic. We demonstrate the results using the graphs, tables and discussed them in detail. It is found that as the injection parameter is responsible for the thinning of the boundary layer, induced magnetic boundary layer; Suction, and unsteady constraints decelerate Bejan number; and the unsteady parameter
decelerates the
profiles and the temperature distributions accelerate by the
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