Miracle-dz/UniFAR-FTUs huggingface dataset:
Free convective flow of a couple stress fluid through a vertical porous channel in the presence of a transverse magnetic field

Nonlinear oberbeck convection of a couple stress fluid in a vertical porous channel in the presence of transverse magnetic field is investigated in this paper. Analytical solution is obtained using the perturbation technique for vanishing values of the buoyancy parameter. Numerical solution of the nonlinear governing equations is obtained using the finite difference technique to validate the results obtained from the analytical solutions. The influence of the physical parameters on the flow, such as couple stress parameter, Hartmann number, temperature parameter, porous parameter and buoyancy parameter are evaluated and presented graphically. A new approach is used to analyse the flow for strong, weak and comparable porosity cases. It is found that increase in porous parameter, couple stress parameter, Hartmann number and temperature parameters decrease the velocity considerably.Kathmandu University Journal of Science, Engineering and Technology Vol. 12, No. I, June, 2016, Page: 49-62
Detecting forgery in image time series based on anomaly detection

Increasing complexity of image forgery methods is an actual problem nowadays. This problem rises due to the expansion of ﬁelds that use digital images in their work. Image time series show the dynamics of the scene and allow it to be compared over time. This paper proposes a new algorithm for detecting forgeries of the single digital image in an image time series described a scene. This algorithm uses analysis of errors set that were computed during reconstruction of the analyzed image using other images of series. The ﬁrst part of the paper describes the proposed algorithm consisted of three stages. The second part of the paper describes forgery detection using morphological image ﬁltering based on guided contrasting. The third part of the paper contains comparison of considered algorithms and investigation results of intra-image copy-move and inter-image copy-move detection.
A two‐step approach to detect and understand dismisinformation events occurring in social media: A case study with critical times

This article describes a novel two ‐ step approach of detecting and understanding dis/ misinformation events in social media that occur during disasters and crisis events. To detect false news events, we designed a deep learning ‐ based detection algorithm and then trained it with a transfer learning scheme so that the algorithm could decide whether a given group of rumor ‐ related tweets is a dis/misinformation event. For understanding how dis/misinformation was diffused in social networks and identifying those who are responsible for creating and consuming false information, we present DismisInfoVis , which consists of various visualisations, including a social network graph, a map, line charts, pie charts, and bar charts. By integrating these deep learning and multi ‐ view visualisation techniques, we could gain a deeper insight into dis/misinformation events in social media from multiple angles. We describe in detail the implementation, training process, and performance evaluations of the detection algorithm and the design and utilization of DismisInfoVis for dis/ misinformation data analyses. We hope that this study will contribute to improving the quality of information generated and shared on social media during critical times, eventually helping both the affected and the general public recover from the impacts of disasters and crisis events.
Aromaticity of rings-in-molecules (RIMs) from electron localization–delocalization matrices (LDMs)

A new and powerful molecular descriptor termed the LDM (localization–delocalization matrix) has recently been proposed as a molecular fingerprinting tool and has been shown to yield robust quantitative-structure-to-activity/property-relationships (QSAR/QSPR). An LDM lists the average number of electrons localized within an atom in a molecule along its diagonal while the off-diagonal elements are the pair-wise average number of electrons shared between every pair of atoms in the molecule, bonded or not. Hence, the LDM is a representation of a fuzzy molecular graph that accounts for the whereabouts of all electron(s) in the molecule and can be expected to encode for several facets of its chemistry at once. We show that the LDM captures the aromatic character of a ring-in-a-molecule by comparing the aromaticity ranking based on the LDMs and their eigenvalues of 6-membered carbon rings within (polycyclic) benzenoid hydrocarbons with the ranking based on four well-established local aromaticity measures (harmonic oscillator model of aromaticity, acromatic fluctuation index, para delocalization index, and nucleus independent chemical shift(0)).
Satellites See the World’s Atmosphere

Satellite meteorology is a relatively new branch of the atmospheric sciences. The field emerged in the late 1950s during the Cold War and built on the advances in rocketry after World War II. In less than 70 years, satellite observations have transformed the way scientists observe and study Earth. This paper discusses some of the key advances in our understanding of the energy and water cycles, weather forecasting, and atmospheric composition enabled by satellite observations. While progress truly has been an international achievement, in accord with a monograph observing the centennial of the American Meteorological Society, as well as limited space, the emphasis of this chapter is on the U.S. satellite effort.
Compact Tetracyclic Nested AMC-Backed Multiband Antenna With High OoB Rejection and Enhanced Gain Radiation for IIoV-Based Sensing and Communication

An innovative artificial magnetic conductor (AMC)-backed quad-band antenna is proposed with gain enhancement, high Out-of-Band (OoB) rejection, forward radiation improvement, and backward radiation reduction for Intelligent Internet of Vehicle (IIoV)-based sensing and communication. It includes a quad-band microstrip radiator and a tetracyclic nested AMC as a reflector. The radiator has a radiating pattern of slotted octagonal patch connected to a rectangular resonant loop, and a meshed defected ground structure (MDGS). The mechanism of resonant frequency generation is derived and analyzed. Then, an AMC reflector with four zero-phases in the reflection coefficient is designed and its equivalent circuit model is established. The AMC unit cell consists of four nested rings and two lumped capacitors. It generates four in-phase reflection bands, which are coincident with the four frequency bands of the radiator. The quad-band antenna gains are enhanced while its profile maintains low due to the in-phase reflection characteristics of the multiband AMC reflector. To verify the design concept, a prototype with a total size of 95 mm $\times101$ mm $\times21.2$ mm is fabricated and measured. The measured 10-dB impedance bandwidths are 2.19–2.54 (14.8%), 3.06–5.25 (52.7%), 6.43–6.96 (7.9%), and 7.71–8.29 (7.3%) GHz, respectively. High OoB rejections between each band reduce electromagnetic interference to feed into radiofrequency circuits. The measured gains and radiation efficiencies range from 3.6 to 8 dBi and from 57.8% to 92%, respectively.
Calculation of the AC Electroquasistatic Sinusoidal Steady-State Coulomb Force on a Conductor Coated with a Lossy Dielectric

The ability to directly calculate the analytical closed-form electroquasistatic sinusoidal steady-state Coulomb force (or ac force) exerted on a conductor coated with a lossy dielectric in the presence of a second grounded conductor and excited by a sinusoidal voltage is of interest in areas such as Microelectromechanical Systems (MEMS). This ac force is due to the phenomenon of dielectric relaxation existing in the lossy dielectric and is dependent on the operating frequency of the voltage source as well as the material properties of the lossy dielectric. In this paper, the authors apply a new technique based on expressing the Coulomb force in terms of a special singularity integral to directly calculate the total ac force exerted on a conductor coated with a lossy dielectric. Specifically, the example of the calculation of the Coulomb ac force on a simplified structure consisting of a solid incompressible lossy dielectric slab attached to the lower plate of a parallel-plate capacitor excited by a sinusoidal voltage is considered.
Performance and properties of the first plasmas of Wendelstein 7-X

The optimized, superconducting stellarator Wendelstein 7-X went into operation and delivered first measurement data after 15 years of construction and one year commissioning. Errors in the magnet assembly were confirmend to be small. Plasma operation was started with 5 MW electron cyclotron resonance heating (ECRH) power and five inboard limiters. Core plasma values of 8$ ? >Te>8 keV, 2$ ? >Ti>2 keV at line-integrated densities n≈3⋅1019 m−2 were achieved, exceeding the original expectations by about a factor of two. Indications for a core-electron-root were found. The energy confinement times are in line with the international stellarator scaling, despite unfavourable wall conditions, i.e. large areas of metal surfaces and particle sources from the limiter close to the plasma volume. Well controlled shorter hydrogen discharges at higher power (4 MW ECRH power for 1 s) and longer discharges at lower power (0.7 MW ECRH power for 6 s) could be routinely established after proper wall conditioning. The fairly large set of diagnostic systems running in the end of the 10 weeks operation campaign provided first insights into expected and unexpected physics of optimized stellarators.
Stochastic variable selection strategies for zero-inflated models

When count data exhibit excess zero, that is more zero counts than a simpler parametric distribution can model, the zero-inflated Poisson (ZIP) or zero-inflated negative binomial (ZINB) models are often used. Variable selection for these models is even more challenging than for other regression situations because the availability of p covariates implies 4 p possible models. We adapt to zero-inflated models an approach for variable selection that avoids the screening of all possible models. This approach is based on a stochastic search through the space of all possible models, which generates a chain of interesting models. As an additional novelty, we propose three ways of extracting information from this rich chain and we compare them in two simulation studies, where we also contrast our approach with regularization (penalized) techniques available in the literature. The analysis of a typical dataset that has motivated our research is also presented, before concluding with some recommendations.
Theory of photoionization of two-electron quantum dots in the resonance region in THz and mid-IR fields

In this work we present an ab initio nonperturbative theory for the description of the two-electron dynamics of a spherical quantum dot (QD) in THz and mid-IR ultrashort laser fields. We have approximated the QD's confinement potential to have a Gaussian-like spatial dependence and have calculated its electronic structure and photoionization one-electron cross sections with an ab initio configuration-interaction approach. We have also calculated the ionization yields following the interaction with a laser pulse by numerically solving the time-dependent Schr\"odinger equation. All results show a strong dependence on the dot size. We have also identified resonances, of the Fano-type, in the photoionization spectrum with properties varying along with the QD size.
Artificial Intelligence (AI): What are the Impacts for Medicine?

AI is our destiny, no one can prevent it anymore, just as it was with the Industrial Revolution of about 200 years ago or the introduction of computers a few decades ago. Nevertheless, there are many warning voices not to allow its eventual domination over humanity and its abuse. This issue also arises in medicine, where AI is in many ways superior to physicians. This concerns their extreme memory for information, their speed, their flexibility, and their ability to combine information. What can medicine do? Medical personnel should extend the qualities that are unique to humans: caring, empathy, intuition, inspiration, and above all, love. Those who have a narrowed consciousness and can be manipulated will be replaced by AI. Those who have a wide and open consciousness can become partners of the AI. This, by the way, concerns the whole humanity, whose division into these two groups is going on at present. The establishment of the AI is thus an immense but necessary challenge for all of us.
Multi-slot Antennas Excited by Novel Dual-stub Loaded Microstrip Lines for 4G/5G Bands

A low-profile dual tuning stub loaded microstrip line-fed multi-slot antenna is presented in this paper, which covers most of the significant 4G LTE bands from 850 MHz to 2800 MHz and beyond. The slot antenna consists of three wide slot sections: two orthogonal slots and a circular slot at the junction of those two slots. This multi-slot antenna is excited by a microstrip feed line loaded with dual stubs, which is on the other side of the dielectric substrate. The stubs are terminated across the width of orthogonal slots. Two of these slots along with feed lines are placed on two corners of the ground plane for pattern diversity. Numerical simulation and measurement results on a fabricated prototype demonstrate excellent agreement in scattering parameters. Good port isolation and gains are also obtained. This design is suitable for use in LTE mobile terminals.
A generalization of the $r$-Whitney numbers of the second kind

In this paper, we consider a (p, q)-generalization of the r-Whitney numbers of the second kind and of the associated r-Dowling polynomials. We obtain generalizations of some earlier results for these numbers, including recurrence and generating function formulas, that reduce to them when p = q = 1. Furthermore, some of our results appear to be new in the case p = q = 1 and thus yield additional formulas for the r-Whitney numbers. As a consequence, some new identities are obtained for the q-Stirling and r-Whitney numbers. In addition, the log-concavity of our generalized Whitney numbers is shown for certain values of the parameters p and q. Finally, we introduce (p, q)-Whitney matrices of the second kind and study some of their properties.
Pengaruh Model Pembelajaran Inkuiri Terhadap Kemampuan Pemecahan Masalah Matematika Siswa Kelas IV Madrasah Ibtidaiyah

Abstrak Penelitian ini dilatar belakangi oleh rendahnya kemampuan siswa dalam memecahkan masalah matematika khususnya pada materi pecahan. Hal ini dapat dilihat dari hasil ulangan harian materi pecahan yang masih rendah yakni di bawah Kriteria Ketuntasan Minimal (KKM). Tujuan penelitian ini adalah untuk mengetahui ada tidaknya pengaruh model pembelajaran inkuiri terhadap kemampuan pemecahan masalah matematika siswa pada materi pecahan di Kelas IV MI Hidayatus Shibyan. Penelitian ini merupakan penelitian kuantitatif dengan metode eksperimen. Teknik pengumpulan data yang digunakan adalah teknik observasi, tes, dan dokumentasi. Sementara itu data hasil penelitian dianalis menggunakan uji analisis data observasi, uji N-gain, dan uji regresi. Hasil penelitian ini menunjukkan bahwa berdasarkan hasil observasi aktivitas guru pada proses pembelajaran sebesar 83% dengan kategori baik dan hasil obsevasi aktivitas siswa sebesar 60% dengan kategori cukup. Sementara itu kemampuan pemecahan masalah matematika siswa mengalami peningkatan sebesar 0,78 dengan kategori tinggi. Dan berdasarkan hasil uji regresi menunjukkan bahwa nilai signifikansinya sebesar 0,001 lebih kecil dari 0,05 dan t hitung sebesar 4.168 lebih besar dari t tabel yakni 1.734, maka Ho ditolak. Ini berarti bahwa terdapat pengaruh yang signifikan antara penggunaan model pembelajaran inkuiri terhadap kemampuan pemecahan masalah matematika siswa pada materi pecahan di kelas IV MI Hidayatus Shibyan. Kata kunci: model pembelajaran inkuiri, pemecahan masala h , matematika Abstract This research is based on the low ability of students in solving mathematical problems, especially in fractional material. This can be seen from the results of the daily review of the fractional material which is still low, which is under the Minimum Completeness Criteria (KKM). This research aims to determine whether there was an influence of the inquiry learning model on students' mathematical problem-solving ability in fraction material in Class IV MI Hidayatus Shibyan. This research is a quantitative research with an experimental method. Data collection techniques used are observation, test, and documentation techniques. Meanwhile the research data is analyzed using the analysis of observation data, N-gain test, and regression test. The results of this research indicate that based on observations of teacher activities in the learning process by 83% with good categories and the results of student activity observation by 60% with sufficient categories. Meanwhile, students' mathematical problem solving abilities have increased by 0.78 in the high category. And based on the results of the regression test shows that the significance value is 0.001 less than 0.05 and t count is 4.168 greater than t table is 1.734, then Ho is rejected. This means that there is a significant influence between the use of inquiry learning models on students' mathematical problem solving skills in fraction material in class IV MI Hidayatus Shibyan. Keywords: inquiry learning model, problem solving, mathematics
The Fog Node Location Problem

This paper summarizes the thesis “The Fog Node Location Problem”, which attempted to answer the question of how fog nodes should be located to process end-user demands that are variable in time and space. The problem was studied from different perspectives, optimizing the number of served users, deployment costs, energy consumption, and latency. This research considered both fixed servers and mobile fog nodes mounted on unmanned aerial vehicles (UAVs). The thesis has introduced several contributions, including linear programming models and novel algorithms. Results showed that the proposed solutions were quite efficient to design a fog computing infrastructure and that UAVs are suitable to be used as fog nodes.
METHICILLIN-RESISTANT Staphylococcus aureus AND MULTIDRUG-RESISTANT Escherichia coli IN BENIN CITY, NIGERIA: A CROSS –SECTION STUDY

Methicillin-resistant Staphylococcus aureus (MRSA) and multidrug-resistant Escherichia coli (MDRE) continuously pose a threat to global health, particularly in low- and middle-income countries, such as Nigeria. Therefore, given the dearth of locally-generated evidence, this study aimed to assess the prevalence of MRSA and MDRE with a view to informing local public health research, practice and policy. This was a cross-sectional study of outpatients presenting to three purposively selected healthcare facilities in Benin City, Edo State, Nigeria. Standard microbiological procedures were performed using nasal swabs and urine specimens. The outcome variables were the identification of MRSA and MDRE, defined as the proportion of persons diagnosed as carrying Staphylococcus aureus and E. coli, respectively, with these resistant bacterial strains. Descriptive analysis using frequencies and percentages by participant’s characteristics was presented. Two hundred and thirty-three persons participated in this study between January 2021 and July 2021, majority of whom were females (67%) and aged 18-24 (45%). Growth of S. aureus was detected in 55.1% (91) of 165 participants who provided nasal swabs. Of these 91 participants, 91.2% (83/91) were confirmed as carrying MRSA. Additionally, 51.7% (i.e., 89) of the 172 participants who provided urine for culture were positive for E. coli growth, of which 92.1% (82/89) were identified as carrying MDRE. This study recorded a high prevalence of both MRSA and MDRE in the study setting, underlining the need for an urgent preventive public health measure, such as awareness and antimicrobial stewardship promotion.
Quad-band couple element antenna structure

Antenna module includes a first and second coupling elements, and first and second resonant matching circuit disposed on the substrate, the substrate. First and second coupling elements are mounted on the substrate is particularly adapted to couple each ring to a first and second frequency bands of the ground plane through respective first and second ports. A first resonant matching circuit functions as a band pass filter in the first frequency band includes a plurality of components having electrical values ​​selected so that it represents a high impedance at least in the second frequency band. A second resonant matching circuit includes a plurality of components having electrical values ​​selected so that it represents a high impedance connected to said second port, in said second band-pass filter function and at least the first frequency band as in a.
Spatiotemporal Characteristics of HF‐Induced Ionospheric Turbulence Revealed by Diagnostic Stimulated Electromagnetic Emission and Test Radio Waves at HAARP

This paper describes the dynamic characteristics of ionospheric plasma turbulences excited by high‐power high‐frequency radio waves during ionospheric modification experiments at the High‐frequency Active Auroral Research Program heating facility, Gakona, Alaska. The data come from measurements of high‐frequency‐induced stimulated electromagnetic emission (SEE) and anomalous absorption of test radiowaves. In addition to quasi‐continuous pump (QCP) waves that excite the “standard” SEE, short pulses of diagnostic waves at frequencies shifted from the QCP frequency have been injected to generate diagnostic SEE. This experimental setup allowed us to study the spectra and damping rates of the plasma waves related to both diagnostic and QCP waves, as well as the QCP‐related small‐scale magnetic field‐aligned irregularities at different altitudes, ±25 km around the center of the heated volume. The results of numerical simulations of the upper hybrid‐related SEE and diagnostic SEE under a “double‐transformation” scheme with the use of an empirical model of the irregularities' spatial spectrum and its dynamics are in good agreement with the observations.
ISOLATED FOVEAL HYPOPLASIA: A CASE REPORT

Foveal hypoplasia is a retinal disorder in which the foveal pit of the macula lutea is incompletely developed and is characterized by nystagmus and low visual acuity. It can manifest itself in isolation, without a clear etiology, or associated with other conditions such as albinism, aniridia, Stickler Syndrome, optic nerve hypoplasia, microphtalmus, etc. Modern retinal imaging technologies are key to diagnosis of this rare retinal disorder. We present a case of a 19-year-old woman with poor distance and near vision and nystagmus since childhood, without other associated diseases. Visual acuity was 0.5 Snellen decimal units in both eyes, with present latent nystagmus. The anterior segment was normal, while an absent foveal reflex was found on fundus examination. Optical coherence tomography (OCT) imaging confirmed the absence of foveal depression in the macular area. OCT-angiography (OCTA) was performed, which confirmed the absence of a foveal avascular zone in the macula. According to the proposed grading system parameters for foveal hypoplasia, this case corresponds with the most severe (grade 4) degree of foveal hypoplasia. Foveal hypoplasia can be associated with numerous etiological factors, and visual acuity can vary depending on the development of foveal photoreceptors and structural gradation. For this reason, especially in children with reduced visual acuity of unknown etiology and the existence of nystagmus, it is recommended to perform additional examinations and use multimodal imaging techniques (OCT and OCTA) in order to make a timely and accurate diagnosis. Management of this disorder includes treatment of the associated ocular and systemic conditions, refractive correction, treatment of amblyopia and use of low vision aids.