391 research outputs found
Influence of thermal radiation on unsteady MHD free convection flow of jeffrey fluid over a vertical plate with ramped wall temperature
Influence of thermal radiation on unsteady magnetohydrodynamic (MHD) free convection flow of Jeffrey fluid over a vertical plate with ramped wall temperature is studied. The Laplace transform technique is used to obtain the analytical solutions. Expressions for skin friction and Nusselt number are also obtained. Results of velocity and temperature distributions are shown graphically for embedded parameters such as Jeffrey fluid parameter , Prandtl number P r, Grashof number G r, Hartmann number H a, radiation parameter R d, and dimensionless time τ. It is observed that the amplitude of velocity and temperature profile for isothermal are always higher than ramped wall temperature
Numerical solution of unsteady free convection flow in a second grade fluid
In this paper, the problem of unsteady free convection flow moves along a vertical plate in a second grade fluid is studied. The vertical plate with constant temperature is considered. The dimensional governing equations are transformed into non dimensional equations using appropriate dimensionless variables and solved numerically using Finite Difference Method. Numerical results for velocity and temperature profiles are displayed graphically for viscoelastic parameter, Grashof number and Prandtl number and discussed in details. It is found that, increasing the values of Grashof number and time leads to increase in the velocity profiles. Increasing the values of the Prandtl number and viscoelastic parameter is found to decrease the velocity profile. It is further found that, increasing the values of Prandtl number tends to decrease the thermal boundary layer thickness
Analysis of heat transfer for unsteady MHD free convection flow of rotating Jeffrey nanofluid saturated in a porous medium
In this article, the influence of thermal radiation on unsteady magnetohydrodynamics (MHD) free convection flow of rotating Jeffrey nanofluid passing through a porous medium is studied. The silver nanoparticles (AgNPs) are dispersed in the Kerosene Oil (KO) which is chosen as conventional base fluid. Appropriate dimensionless variables are used and the system of equations is transformed into dimensionless form. The resulting problem is solved using the Laplace transform technique. The impact of pertinent parameters including volume fraction φ, material parameters of Jeffrey fluid λ1, λ, rotation parameter r, Hartmann number Ha, permeability parameter K, Grashof number Gr, Prandtl number Pr, radiation parameter Rd and dimensionless time t on velocity and temperature profiles are presented graphically with comprehensive discussions. It is observed that, the rotation parameter, due to the Coriolis force, tends to decrease the primary velocity but reverse effect is observed in the secondary velocity. It is also observed that, the Lorentz force retards the fluid flow for both primary and secondary velocities. The expressions for skin friction and Nusselt number are also evaluated for different values of emerging parameters. A comparative study with the existing published work is provided in order to verify the present results. An excellent agreement is found
Spontaneous Four-Wave Mixing of de Broglie Waves: Beyond Optics
We investigate the atom-optical analog of degenerate four-wave mixing of
photons by colliding two Bose-Einstein condensates (BECs) of metastable helium
and measuring the resulting momentum distribution of the scattered atoms with a
time and space resolved detector. For the case of photons, phase matching
conditions completely define the final state of the system, and in the case of
two colliding BECs, simple analogy implies a spherical momentum distribution of
scattered atoms. We find, however, that the final momenta of the scattered
atoms instead lie on an ellipsoid whose radii are smaller than the initial
collision momentum. Numerical and analytical calculations agree well with the
measurements, and reveal the interplay between many-body effects, mean-field
interaction, and the anisotropy of the source condensate
Young Corn Ear Addition Improves Some Nutrients and Lowering Glycemic Index of Chiffon Cake
The effects of partial replacement of wheat flour with young corn ear (YCE) on sensory properties
and glycemic index (GI) of chiffon cake were investigated. Dried YCE was processed into powdered
form and added in chiffon cake formulations to replace wheat flour partially at concentrations of 0
(control), 10%, 20% and 30%. Protein, ash and dietary fibre contents of chiffon cake added with
YCE powder were increased in line with the levels of YCE used. Even though protein content of
YCE-based cakes increased in line (13.3% to 15.7%) with the levels of YCE (10% to 30%), but
there was no significant difference compared to control. Sensory evaluation results indicate that
partial replacement of wheat flour with up to 10% is satisfactory as compared to other levels of
wheat flour replacement. Interestingly, addition of YCE at 10% to partially replace wheat flour
resulted in reduction of postprandial blood glucose response. The GI value for chiffon cake added
with YCE was 49 lower than control cake which recorded GI value at 60. In conclusion, novel food
ingredient of YCE can be incorporated in selected bakery products to enhance nutritional composition
while at the same time help in reducing the GI value. Further investigation on the addition of
YCE into other bakery products in relation to nutrition and glycemic response effects can also be
explored
Antioxidative properties and proximate analysis of spent coffee ground (SCG) extracted using ultrasonic-methanol assisted technique as a potential functional food ingredient
Spent coffee ground (SCG) produced in tons by restaurants and cafeterias and domestic consumers is a potentially good source of natural antioxidants because it contains substantial amounts of bioactive compounds. The purpose of this study was to identify the physicochemical and antioxidant properties of three different types of spent coffee ground (SCG), namely Robusta, Arabica and Liberica extracted using ultra-sonicmethanol assisted technique. DPPH, FTC, TBA, total phenolic content (TPC) and total flavonoid content (TFC) were used to measure the antioxidant properties. Robusta SCG exhibited the highest DPPH inhibition 41.63±0.04%), FTC (60.42±0.03%) and TBA analysis (73.09±0.08%). The total phenolic compounds in the samples varied widely ranging from 18.94±0.06 to 26.23±0.86 mg GAE/g sample, with Robusta SCG showing the highest value among the three, while Arabica SCG depicted the highest amount total
flavonoid content (47.62±0.05 to 56.20±0.08). A strong correlation between antioxidant activity and total phenolic content were observed in this study. Compared to Arabica and
Liberica SCGs expended, Robusta SCG demonstrated a stronger beneficial effect against lipid peroxidation. This study reveals that SCGs can be regarded as a new useful source of
natural antioxidant with a view to increasing the use of antioxidant synthetics by using the ingredient of agro-industrial residues in food production especially ingredients for functional food
A Proposed Pandemic Clause for Force Majeure Events under Construction Contracts in Malaysia
The construction industry is not spared from the adverse effect of the Covid-19 pandemic. This paper aims to identify the triggering events of Force Majeure under the standard forms of construction contract in Malaysia and determine the extent to which the relevant provisions in these contracts apply to the Force Majeure events during the pandemic. This research employs a qualitative research methodology, and the outcomes will help clarify the grey area of Force Majeure law caused by a global pandemic. It proposes guidelines to the construction industry when dealing with a similar disruption caused by an outbreak of the disease.
Keywords: pandemic clause, Force Majeure, construction contracts
eISSN: 2398-4287© 2021. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians/Africans/Arabians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.
DOI: https://doi.org/10.21834/ebpj.v6i16.273
Definitive radiotherapy for locally advanced squamous cell carcinoma of the vulva and technical issues: a case report
This case report describes a complex radical 3D-Conformal Radiotherapy treatment
planning, dosimetric issues and outcome of definitive treatment of un-resectable carcinoma of
the vulvar in a 42-year old lady. The patient presented with large fungating mass of the vulva
which was biopsy confirmed as Keratinizing Squamous Cell Carcinoma. Further staging
investigation revealed locally advanced disease (T4), with bilateral inguinal lymph nodes
involvement. There is no systemic metastasis or intra-pelvic nodes. The patient was seen by
Gynae-Oncology team and the disease was deemed un-resectable without significant morbidity.
She was treated to a total dose of 64.8Gy in 36 fractions over 7 weeks with concurrent weekly
Cisplatinum in 2 phases. 3D-Conformal radiotherapy technique using the modified segmental
boost technique (MSBT, large PA and small AP photon fields with inguinal electron matching)
was used. TLD chips were used for in-vivo dose verification in phase 1 and 2 of the treatment.
At completion of planned radiotherapy, patient had a complete clinical response, grade 2-3 skin
toxicity, grade 2 rectal toxicity, and grade 2 dysuria Vulval Squamous Cell Carcinomas are very
radiosensitive tumours and the skills of the treating Radiation Oncologist, Dosimetrists,
Physicist, Radiation Therapist and also nurses is of foremost importance is ensuring good clinical
outcomes
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