The analysis of peristaltic-ciliary transport in the human female fallopian tube, specifically in relation to the growing embryo, is a matter of considerable physiological importance. This paper ...proposes a biomechanical model that incorporates a finite permeable tube consisting of two layers, where the Jeffrey fluid model characterizes the viscoelastic properties of the growing embryo and continuously secreting fluid. Jeffrey fluid entering with some negative pressure gradient forms the core fluid layer while continuously secreting Jeffrey fluid forms the peripheral fluid layer. The resulting partial differential equations are solved for closed-form solutions after employing the assumption of long wavelength. The analysis delineated that increasing the constant secretion velocity, Darcy number, and Reynolds number leads to a decrease in the appropriate residue time of the core fluid layer and a reduction in the size of the secreting fluid bolus in the peripheral fluid layer. Eventually, the boluses completely disappear when the constant secretion velocity exceeds 3.0 Progesterone (Formula: see text) and estradiol (Formula: see text) directly regulate the transportation of the growing embryo, while luteinizing hormone (LH) and follicle-stimulating hormone (FSH), prolactin, anti-mullerian hormone (AMH), and thyroid-stimulating hormone (TSH) have an indirect effects. Based on the number and size of blastomeres, the percentage of fragmentation, and the presence of multinucleated blastomeres two groups were formed in an in vitro experiment. Out of 50 patients, 26 (76.5%) were pregnant in a group of the good quality embryos, and only 8 (23.5%) were in a group of the bad quality embryos. The transport of growing embryo in the human fallopian tube and preimplantation development of human embryos in in vitro are constraint by baseline hormones FSH, LH, prolactin, Formula: see text, AMH, and TSH.
In this paper, we study the gravitational wave polarization modes for some particular
f
(
R
)
models using Newman-Penrose formalism. We find two extra scalar modes of gravitational wave (longitudinal ...and transversal modes) in addition to two tensor modes of general relativity. We conclude that gravitational waves correspond to class
II
6
under the Lorentz-invariant E(2) classification of plane null waves for these
f
(
R
)
models.
The prime purpose of this analysis is to investigate the effect of variable thermophysical properties of nanofluid on bioconvection boundary layer flow along a uniformly heated vertical cone. The ...governing equations with associated boundary conditions for this phenomenon are converted into a non-dimensional form via continuous transformations, which are then solved by using the implicit finite difference method. How does the phenomena of heat transfer is effected due to the temperature-dependent thermophysical properties of the fluid is the question investigated in this manuscript. Comprehensive numerical computations are carried out for a wide range of the parameters that are describing the flow characteristics. The influence of the physical parameters on the distribution of velocity and temperature profiles, wall skin friction and local rate of heat transfer is explored. Comparison with some special cases is also done and good agreement is found. It is recorded that the variable thermophysical properties of the fluid are more likely to promote the rate of heat transfer, Qw as compared to fluid having constant properties.
•Effect of variable thermophysical properties of nanofluid bioconvection along a cone is studied.•Comprehensive numerical computations are carried out for wide range of dimensionless parameters.•The results are discussed in terms of velocity and temperature profiles, wall skin friction and local rate of heat transfer.•It is found that variable thermophysical properties augment Qw as compared to constant fluid properties.
The present study aims to study the cytotoxicity of ZnO-TiO2-Chitosan-Amygdalin nanocomposites (ZnO-TiO2-Chitosan-Amygdalin) on T lymphoblast cancer cells (MOLT-4). In a study, nanocomposites ...containing 2.5 to 15 µg/ml MTT were screened for their anticancer activity. Its anticancer properties were significantly higher than those of other nanocomposites with an IC50 value of 10.34 µg/ml. We studied the mechanism of action for cytotoxic cell death by fluorescence microscopy using Acridine Orange/EtBr (AO/EtBr) and Rhodamine 123 staining procedures. Using DCFH-DA, ZnO-TiO2-Chitosan-Amygdalin nanocomposites were analyzed to determine ROS production. The change in apoptotic protein expression for the 24 h following treatment with MOLT-4 cells for Caspase-3, 8, and 9. Nanocomposites containing ZnO-TiO2-Chitosan-Amygdalin increased the number of early and late apoptotic cells in MOLT-4 cells. ZnO-TiO2-Chitosan-Amygdalin nanocomposites also enhanced mitochondrial apoptosis through Caspase cascade signaling. MOLT-4 cells phosphorylated Caspase cascade in response to ZnO-TiO2-Chitosan-Amygdalin nanocomposites. Compared to the control group, the cancer cells treated with ZnO-TiO2-Chitosan-Amygdalin nanocomposites significantly arrest the proliferation and induces cleavage of pro-apoptotic proteins which leads to apoptotic cell death. Accordingly, ZnO-TiO2-Chitosan-Amygdalin nanocomposites might be effective against T lymphoblast cancer.
This article is concerned with the problem of periodic magnetohydrodynamic (MHD) natural convection boundary-layer flow of a radiating micropolar fluid near a vertical surface. Such type of problems ...are posed by induction electromagnetic pumps and generators. The governing equations are reduced to a convenient form by the introduction of stream function formulations and are simulated by the implicit finite difference method along with the Keller-box scheme. The results of the surface shear stress, rate of heat transfer, distribution of couple stress, velocity profile, temperature profile and angular velocity profile are shown graphically for a range of parameters. Excellent agreement is found when present solutions are compared with the previous studies. It is shown that the heat transfer rate remains insensitive when magnetic field parameter, micropolar parameter and micro-inertia density parameter increases. Further, the micropolar parameter, K, has dominant effect on skin friction coefficient and couple stress coefficient.
Data is one of the most significant assets nowadays and needs to address correctly in the growing risk of cybersecurity. Additionally, every year, data is stolen and modified from the internet when ...transmitting. Therefore, to improve security while transmission, there are two techniques available called cryptography and steganography. In cryptography, the information is encrypted to ciphertexts using a private key, but the message's existence is visible to others, no matter how unbreakable they are. On the other hand, steganography hides the secret data in an ordinary non-secret file to avoid visual detection. This paper proposed a new data hiding method using LSB image steganography, where confidential information uses only the selected image pixel. For that, image pixel information is used to filter the complete image to decide the candidate pixel, and a user-defined password is used to secure the LSB steganography. For better security, before applying steganography, the AES method encrypts the secret message. In the experiment, MSE and PSNR value are measured to assess the quality of the resultant stego image. The stego image provides higher PSNR and less MSE value as compared to other studied methods, which illustrate the flexibility of the proposed method.
تقييم تصور طلاب كلية الطب تجاه التعلم عن بعد وتأثيره على أدائهم الأكاديمي خلال جائحة كوفيد -19 في كلية الطب في القنفذة، بجامعة أم القرى، المملكة العربية السعودية.
تم إجراء دراسة مقطعية على طلاب الطب ...في كلية الطب في القنفذة، بجامعة أم القرى، المملكة العربية السعودية خلال العام الدراسي 2020-2021. تم جمع البيانات من خلال استخدام استبانة عبر الإنترنت مصممة مسبقا خلال الفترة (من 1 مارس إلى 31 مايو 2021).
استجاب إجمالي 223 طالبا جامعيا للاستطلاع عبر الإنترنت بمعدل استجابة 74.3٪، ومثلت الطالبات 54.3٪. وتم تفضيل التعليم المدمج لدى غالبية الطلاب (73.1٪). علاوة على ذلك، رأى 72.2٪ من الطلاب أن التعلم عن بعد يوفر وقتهم وحوالي الثلثين (61.4٪) من الطلاب تم تحفيزهم من خلال توفر تسجيل المحاضرات خلال التعليم عن بعد. كما أفاد حوالي 59٪ و54٪ أن التعلم عن بعد كان أكثر راحة وحسّن مهاراتهم التكنولوجية على التوالي. كان ضعف الاتصال (66٪)، ومشاكل الشبكة (61.4٪) من التحديات الشائعة للتعلم عن بعد. ولكن على أي حال، كانت هناك زيادة عالية ذات دلالة إحصائية في متوسط درجات الطلاب مع التعلم عن بعد.
التعلم عن بعد له العديد من المزايا مثل توافر المواد التعليمية، وتحسين المهارات التقنية للطلاب وتوفير الوقت. بينما كانت العقبات الرئيسية هي مشاكل الإنترنت، وسوء الاتصال والحرمان من الممارسة الاكلينيكية الحقيقية. على الرغم من الزيادة الكبيرة في المعدل التراكمي للطلاب أثناء التعلم عن بعد مقارنة بالتعلم التقليدي، إلا أن الغالبية فضلت التعلم المدمج ليكون أفضل استراتيجية تعليمية في التعليم الطبي.
This study aimed to assess perceptions among undergraduate medical students toward distance learning and its effects on their academic performance during the COVID-19 pandemic at Al-Qunfudhah College of Medicine, Umm Al-Qura University, KSA.
A cross-sectional study was conducted among medical students at Al-Qunfudhah College of Medicine, Umm Al-Qura University, KSA, during the 2020–2021 academic year. Data were collected through a predesigned, well-structured online survey from (1st March to 31th May 2021).
A sample of 223 undergraduates responded to an online survey, with a response rate of 74.3%; female students represented 54.3%. Blended education was preferred by most students (73.1%). Moreover, 72.2% of students perceived that distance learning saved their time, and approximately two-thirds (61.4%) were stimulated by the availability of lecture recordings. Approximately 59% and 54% reported that distance learning was more comfortable and improved their technology skills, respectively. Poor communication (66%) and network problems (61.4%) were the most common challenges in distance learning. Nonetheless, a substantial increase (P = 0.001) in students' grade point averages was observed with distance learning.
Most medical students preferred blended education combining the advantages of both traditional and distance learning strategies. The availability of educational materials, improvements in students' technological skills and time saving were the most perceived benefits of distance learning among students. However, the main obstacles were internet problems, poor communication and deprivation from real clinical practice. Despite the improvement in students' grade point averages during distance learning compared with traditional learning, blended education was recommended by the majority or participants.
In this study, natural convection boundary layer flow of thermally radiating fluid along a heated vertical wavy surface is analyzed. Here, the radiative component of heat flux emulates the surface ...temperature. Governing equations are reduced to dimensionless form, subject to the appropriate transformation. Resulting dimensionless equations are transformed to a set of parabolic partial differential equations by using primitive variable formulation, which are then integrated numerically via iterative finite difference scheme. Emphasis has been given to low Prandtl number fluid. The numerical results obtained for the physical parameters, such as, surface radiation parameter, R, and radiative length parameter,
ξ
, are discussed in terms of local skin friction and Nusselt number coefficients. Comprehensive interpretation of velocity distribution is also given in the form of streamlines.
.
This paper explores the anisotropic stellar configurations governed by polytopic equation of state in
f
(
R
,
T
) theory (where
R
denotes the Ricci scalar and
T
is the trace of energy-momentum ...tensor). For this purpose, we numerically solve the system of differential equations obtained from the field equations and hydrostatic equilibrium equation. We investigate physical characteristics of polytropic stars and examine their stability using both causality condition as well as the adiabatic index. It is concluded that stellar configurations are stable and the value of mass function lies within the Chandrasekhar limit.
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