Miracle-dz/UniFAR-FTUs huggingface dataset:
Circuital Modeling of Polarization and Depolarization Currents in Polymeric Materials Under Low Electric Fields

This article proposes a circuital model that describes polarization and depolarization currents (PDCs) observed in thin samples of polymeric materials under the application of an average electric field up to 30 kV/mm. The model employs the least possible number of parameters to fit the experimental measurements. A single carrier with a negative charge is considered. The polarization curves are modeled by a power law to account for transport assisted by shallow traps. A model for the deep traps with a Gaussian distribution of the density of states (DOS) describes the depolarization curves. Experimental measurements made on various materials with different charging and discharging times suggest that a portion of the deep traps is filled within a few seconds, while the time needed to release the trapped charges is in the order of several hours. The agreement between experimental and simulated currents confirms the validity of the proposed model that can be seen as a generalization of the extended Debye model.
Underwater light attenuation inhibits native submerged plants and facilitates the invasive co‐occurring plant Cabomba caroliniana

Decreasing in the diversity and distribution of native submerged plants have been widely observed in recent decades. Global underwater darkening, which is mainly caused by radiation dimming and a decrease in transparency due to, e.g. eutrophication, has emerged as a general trend that strongly hampers the growth of submerged plants in lakes by decreasing the light available for photosynthesis. However, few studies have attempted to compare the responses of native and invasive submerged plants to underwater darkening. In this study, we aimed to compare the effects of light attenuation on the growth and photosynthesis traits of native and invasive submerged plants.
Radio frequency rectifiers based on organic thin-film transistors

One important technical hurdle that has to be overcome for using organic transistors in radio-frequency identification tags is for these devices to operate at rf frequencies (typically 13.56MHz) in the front end. It was long thought that organic transistors are too slow for this. In this letter we show that organic transistor based full-wave rectifier circuits utilizing pentacene, a p-channel organic semiconductor, can operate at this frequency with a useful efficiency. In order to achieve such high-frequency operation, we make use of the nonquasistatic state of the transistors.
A characterization of multiplication operators on reproducing kernel Hilbert spaces

In this note, we prove that an operator between reproducing kernel Hilbert spaces is a multiplication operator if and only if it leaves invariant zero sets. To be more precise, it is shown that an operator T between reproducing kernel Hilbert spaces is a multiplication operator if and only if (Tf)(z)=0 holds for all f and z satisfying f(z)=0. As possible applications, we deduce a general reflexivity result for multiplier algebras, and furthermore prove fully vector-valued generalizations of mulitplier lifting results of Beatrous and Burbea.
Optical Coherence Tomography Angiography in CRB1-Associated Retinal Dystrophies

Aim of the study: To report optical coherence tomography angiography (OCTA) findings in patients affected by CRB1-associated retinal dystrophies. Method: Patients affected by a genetically confirmed CRB1-associated retinal dystrophy were prospectively enrolled in an observational study, along with age- and sex-matched healthy volunteers as control subjects. All study and control subjects received a complete ophthalmic examination and multimodal retinal imaging, including OCTA. Result: A total of 12 eyes from 6 patients were included in the study. The mean BCVA of patients was 0.42 ± 0.25 logMAR. Two patients showed large central atrophy, with corresponding definite hypo-autofluorescence on fundus autofluorescence (FAF). Another four patients disclosed different degrees of RPE mottling, with uneven FAF. On OCTA, the macular deep capillary plexus and choriocapillaris had a lower vessel density in eyes affected by CRB1-associated retinopathy when compared to healthy controls. On the other hand, vessel density at the peripapillary radial capillary plexus, superficial capillary plexus, and deep capillary plexus was significantly altered with respect to control eyes. Statistical analyses disclosed a negative correlation between the deep capillary plexus and both LogMAR best corrected visual acuity and central retinal thickness. Conclusion: Our study reveals that CRB1-associated retinal dystrophies are characterized by vascular alterations both in the macular and peripapillary region, as assessed by OCTA.
Achieving Precise Cup Positioning in Direct Anterior Total Hip Arthroplasty: A Narrative Review

Malpositioned implants in total hip arthroplasty are associated with impingement, increased wear, and dislocations, thus precise cup positioning is crucial. However, significant deviations between targeted and actually achieved cup positions have been found even in patients operated by experienced surgeons. When aiming for higher accuracy, various methods based on freehand positioning lead by anatomic landmarks, C-arm fluoroscopy, imageless navigation, or robotic-assisted-surgery have been described. There is a constant development of new products aiming to simplify and improve intraoperative guidance. Both the literature and expert opinions on this topic are often quite controversial. This article aims to give an overview of the different methods and systems with their specific advantages and potential pitfalls while also taking a look into the future of cup positioning in anterior hip replacements.
Rossi X-Ray Timing Explorer Observations of A2256

The cluster of galaxies A2256 was observed by the PCA and HEXTE experiments aboard the Rossi X-Ray Timing Explorer satellite during the period 2001 July-2002 January, for a total of ~343 and ~88 ks, respectively. Most of the emission is thermal, but the data analysis yields evidence for two components in the spectrum. On the basis of statistical likelihood alone, the secondary component can be either thermal or power law. Inclusion in the analysis of data from ASCA measurements leads to a more definite need for a second component. Joint analysis of the combined RXTE+ASCA data sets yields kT1 = 7.9 keV and kT2 = 1.5 keV, when the second component is also thermal, and kT = 7.7 keV and α = 2.2, if the second component is fitted by a power law with (photon) index α; all errors are at 90% confidence. Given the observed extended regions of radio emission in A2256, it is reasonable to interpret the deduced power-law secondary emission as due to Compton scattering of the radio-producing relativistic electrons by the cosmic microwave background radiation. If so, then the effective, mean volume-averaged value of the magnetic field in the central 1° region of the cluster—which contains both the "halo" and "relic" radio sources—is B ~ 0.2 μG.
Professional Quality of Life, Work-Related Stress, and Job Satisfaction among Nurses in Saudi Arabia: A Structural Equation Modelling Approach

Objective To examine the interrelated impacts of work-related stress, compassion satisfaction (CS), and job satisfaction on burnout (BO) and secondary traumatic stress (STS) among nurses using structural equation modelling (SEM). Methods A cross-sectional design was used to survey 727 nurses at a teaching hospital in eastern Saudi Arabia. Three scales were used: the Quality of Life (ProQOL) scale, the Nursing Stress Scale (NSS), and the Job Satisfaction Survey (JSS). Data were analysed using SPSS and Analysis of Moment Structures (AMOS), and SEM analysis was conducted to confirm the interrelations among variables. Results The final model had a good fit for the obtained data (X2 = 2.726, RMSEA = 0.032). Stress is directly related to BO and STS, and the following variables were directly related to STS: job satisfaction, BO, and CS. Lastly, BO mediated the relationship between stress and STS. Conclusion It is crucial to analyze the effect of stress, CS, and job satisfaction which seems to have a positive and negative impact on nurses' BO and STS. Therefore, implementing a management strategy to manage stress and satisfaction can enhance nurses' quality of life, support the maintenance of positive attitudes, and enhance the standard of patient care.
Infrared reflection nebulae in Orion Molecular Cloud 2

New obervations of Orion Molecular Cloud-2 have been made from 1-100 microns using the NASA Infrared Telescope Facility and the Kuiper Airborne Observatory. An extensive program of polarimetry, photometry and spectrophotometry has shown that the extended emission regions associated with two of the previously known near infrared sources, IRS1 and IRS4, are infrared reflection nebulae, and that the compact sources IRS1 and IRS4 are the main luminosity sources in the cloud. The constraints from the far infrared observations and an analysis of the scattered light from the IRS1 nebula show that OMC-2/IRS1 can be characterized by L less than or equal to 500 Solar luminosities and T approx. 1000 K. The near infrared (1-5) micron albedo of the grains in the IRS1 nebula is greater than 0.08.
Logic Tree Branch Weights and Probabilities: Summing up to One is not Enough

Logic trees have become the most popular tool for the quantification of epistemic uncertainties in probabilistic seismic hazard assessment (PSHA). In a logic-tree framework, epistemic uncertainty is expressed in a set of branch weights, by which an expert or an expert group assigns degree-of-belief values to the applicability of the corresponding branch models. Despite the popularity of logic-trees, however, one finds surprisingly few clear commitments to what logic-tree branch weights are assumed to be (even by hazard analysts designing logic trees). In the present paper we argue that it is important for hazard analysts to accept the probabilistic framework from the beginning for assigning logic-tree branch weights. In other words, to accept that logic-tree branch weights are probabilities in the axiomatic sense, independent of one's preference for the philosophical interpretation of probabilities. We demonstrate that interpreting logic-tree branch weights merely as a numerical measure of “model quality,” which are then subsequently normalized to sum up to unity, will with increasing number of models inevitably lead to an apparent insensitivity of hazard curves on the logic-tree branch weights, which may even be mistaken for robustness of the results. Finally, we argue that assigning logic-tree branch weights in a sequential fashion may improve their logical consistency.
Refractive interstellar scintillation in pulsar dynamic spectra

The evolution of the dynamic spectra of eight pulsars over 16 months is reported. Observations were made at Jodrell Bank at 408 MHz from 1984 September to 1986 January. The changing form of the spectra is interpreted as refractive modulation of diffractive interstellar scintillation. The correlation function versus time and frequency was computed for each observation and estimates were made of the apparent decorrelation widths in frequency and time, and the frequency drift rate of scintillation features. A model is developed for how these three parameters vary with epoch under changing angles of refraction. The model successfully describes the variations for four of the pulsars, for which the drift rate shows some sign reversals between epochs. Two pulsars kept a constant sign of drift rate, which we interpret as due to persistent refracting structures in their lines of sight, which are consistent with an intervening H ii region. Studies were made of the variability of the diffractive bandwidth, the visibility of the drifting features in the dynamic spectra, the refractive shifts and the speed estimated for the diffraction pattern. These quantities mostly agree with expectations from the model. The pulsar PSRB2016+28, which has an unusually low proper motion, shows clear modulation of the pattern speed by the Earth's annual motion. In the 11 epochs observed for PSRB2016+28, two showed unmistakable periodic modulation in the dynamic spectra. Several other pulsars exhibited occasional periodic patterns with low modulation. The phenomenon varies substantially between the pulsars, being more common for lower strengths of scattering.
Predicting sound levels from wind speed in a coniferous forest

Sounds created by the interaction of wind and foliage (as well as sounds of running water and animal populations) are the principal sources of the ambient noise environments in many uninhabited areas. Since these indigenous sources create much of the masking energy in outdoor recreational settings, which limits the audibility of noise intrusions, characterizing their influence is an important step in predicting and managing natural quiet. Cross‐correlational analyses of time series of wind speed and A‐weighted sound‐pressure observations in a wilderness environment indicate that over half of the variance in ambient sound levels can be predicted from knowledge of wind speed. [Research sponsored under National Park Service Contract CX‐2000‐9‐0026. ]
Large near-infrared lateral photovoltaic effect observed in Co/Si metal-semiconductor structures

The operating frequencies of current position-sensitive detectors (PSDs) based on lateral photovoltaic effect (LPE) are mainly concentrated in the visible or ultraviolet region. Here we report a remarkable near-infrared-sensitive LPE in nanoscale metal-semiconductor structures of Co/Si. We show that by manipulating the Co thickness, the optimum light wavelength for obtaining the largest LPE in such Co/Si structures can be controlled in infrared region. Besides, the observed lateral photovoltage position sensitivity of 82 mV/mm at 832 nm light wavelength in Co(3.5 nm)/Si is considerably large, suggesting this simple structure a potential candidate for infrared-sensitive PSDs.
THERMAL EXPANSION OF ZrO2-ZrW2O8 COMPOSITES PREPARED USING CO-PRECIPITATION ROUTE

In this work, a series of ZrO2/ZrW2O8 ceramic composites with different amounts of ZrW2O8 were successfully prepared by calcining the precursors synthesized using co-precipitation route at 1150°C for 3 h. The X-ray diffraction (XRD) data confirmed that the composites only consisted of α-ZrW2O8 phase and m-ZrO2 phase. The scanning electron microscopy (SEM) analysis of the synthesized ZrO2/ZrW2O8 composites showed that the specimens had good mixed-uniformities. In addition, the thermal expansion coefficients of the composites decreased with increased amounts of negative thermal expansion ZrW2O8, specimen with 26wt% ZrW2O8 shows almost zero thermal expansion and its average thermal expansion coefficient is -0.5897×10-6K-1 in the temperature range from 30°C to 600°C.
Effects of Intensive Glycemic Control on Serum Exosome miR-126-3p and miR-125b-1-3p Levels and Wound Healing in Patients with Diabetic Ulcers

Objective Intensive glycemic control and exosomal miRNAs have both been reported to improve wound repair in diabetic ulcers. In this study, we aimed to investigate the effects of intensive glycemic control on serum exosome microRNA-126-3p (miR-126-3p), microRNA-125b-1-3p (miR-125b-1-3p), and wound healing in patients with diabetic ulcers. Methods Herein, 45 diabetic patients with an ulcer, aged 35–75 years old, were randomly assigned to the intensive glycemic control group (n = 21) and the conventional glycemic control group (n = 24). Serum exosomes were extracted in the laboratory and assessed by Western blotting, transmission electron microscopy, and nanoparticle tracking analysis. The expression of miR-126-3p and miR-125b-1-3p was validated using quantitative real-time polymerase chain reaction. The wound healing of each diabetic ulcer patient was measured and imaged; additionally, clinical and follow-up data were collected. Finally, the clinical and laboratory data were combined for statistical analysis. Results Intensive glycemic control was significantly more conducive to wound healing and infection control than conventional glycemic control (P < 0.05). Serum exosomal miR-126-3p was negatively correlated with fasting plasma glucose levels (r = 0.34, P < 0.05) and positively associated with the wound healing rate (r = 0.45, P < 0.01). The level of miR-126-3p in the intensive glycemic control group was significantly higher than that in the conventional glycemic control group (P < 0.01). Serum exosomal miR-125b-1-3p was not correlated with blood glucose levels (r = 0.03, P > 0.05) and was positively associated with the wound healing rate (r = 0.33, P < 0.05). No significant difference was observed in the level of miR-125b-1-3p between the intensive and conventional glycemic control groups. Regarding the prognosis of diabetic ulcers, the intensive glycemic control group was better than the conventional group (Z = −2.02, P < 0.05). Conclusion Serum exosome (miR-125b-1-3p and miR-126-3p) levels are correlated with wound healing in diabetic ulcers. Intensive glycemic control increases the serum exosomal miR-126-3p level, which might be one of the mechanisms that promotes wound healing in diabetic ulcers.
Relaxation of Energy and Approximate Riemann Solvers for General Pressure Laws in Fluid Dynamics

We consider the Euler equations for a compressible inviscid fluid with a general pressure law $p(\rho,\varepsilon)$, where $\rho$ represents the density of the fluid and $\varepsilon$ its specific internal energy. We show that it is possible to introduce a relaxation of the nonlinear pressure law introducing an energy decomposition under the form $\varepsilon= \varepsilon _1 + \varepsilon _2. $ The internal energy $\varepsilon _1$ is associated with a (simpler) pressure law $p_1(\rho,\varepsilon_1)$; the energy $\varepsilon _2$ is advected by the flow. These two energies are also subject to a relaxation process and in the limit of an infinite relaxation rate, we recover the initial pressure law p. We show that, under some conditions of subcharacteristic type, for any convex entropy associated with the pressure p, we can find a global convex and uniform entropy for the relaxation system. From our construction, we also deduce the extension to general pressure laws of classical approximate Riemann solvers for polytropic gases, which only use a single call to the pressure law (per mesh point and time step). For the Godunov scheme, we show that this extension satisfies stability, entropy, and accuracy conditions.
Prevalence of research-related anxiety among students of Allied Health Sciences

Background: Anxiety is one of the most common mental disorders. Although being detrimental, it is less researched upon than depression. While research is an essential component of medical education, it is also unfamiliar to undergraduate medical students. Therefore, research at the undergraduate level has been shown to cause anxiety among students. Objective: To determine research-related anxiety among allied Health Sciences students. Methods: A cross-sectional study was conducted in which a sample of 150 undergraduate students was selected on the basis of inclusion (no past history of mental illness, no traumatic incident in past 6 months and allied health sciences student from final year) and exclusion (traumatic incident in past 3 months, failure in recent major exam) criteria. The participants after signing the informed consent were recruited in the study through a non-probability convenient sampling technique. The data was collected using the Generalized Anxiety Disorder scale (GAD-7 scale). Data were analyzed through SPSS version 21. Results: In this study, 150 undergraduate students participated in the study. Results showed that out of the 150 students, 90 (60%) had mild anxiety related to research, 32(21%) students had moderate-level anxiety, and 28(18%) students had severe anxiety. Conclusion: According to the results of this study, the majority of students in their final year or semester experienced mild levels of research related-anxiety.
250-MHz quantitative acoustic microscopy for assessing human lymph-node microstructure

We employed quantitative acoustic microscopy (QAM) to measure acoustic properties of tissue microstructure. 32 QAM datasets were acquired from 2, fresh and 11, deparaffinized, 12-µm-thick lymph-node samples obtained from cancer patients. Our custom-built acoustic microscope was equipped with an F-1.16, 250-MHz transducer having a 160-MHz bandwidth to acquire reflected signals from the tissue and a substrate that intimately contacted the tissue. QAM images with a spatial resolution of 7 µm were generated of attenuation (A), speed of sound (SOS), and acoustic impedance (Z). Samples then were stained using hematoxylin and eosin, imaged by light microscopy, and co-registered to QAM images. The spatial resolution and contrast of QAM images were sufficient to distinguish tissue regions consisting of lymphocytes, fat cells and fibrous tissue. Average properties for lymphocyte-dominated tissue were 1552.6 ± 30 m/s for SOS, 9.53 ± 3.6 dB/MHz/cm for A, and 1.58 ± 0.08 Mrayl for Z. Values for Z obtained from fresh s.
Temperature inversions in France – Part B: Spatial variations

Our database comprises daily minimum and maximum temperatures observed over 10 years at 859 pairs of meteorological stations throughout France. Each pairing associates a low and a high station. The influence of six predictors on the intensity, frequency, and duration of temperature inversions is measured by linear regressions. Five predictors are drawn from a 250 m-resolution DTM: elevation, depth of the valley where the low stations are located, magnitude of positive relief (ridge, hills), gradient of the slope of the hill or mountainside, and altitudinal amplitude between the high and the low station. The sixth descriptor used is the distance to the nearest sea. Topography exerts a major influence over the formation of thermal inversions. Three of the descriptors account for more than 80% of the variance of the inversion characters: distance to the sea, valley depth, and altitudinal amplitude. Elevation explains only 24% of that variance. The spatial distribution of the three characteristics of the inversions highlights several categorizations that fit into several nested scales. The 859 sites can be arranged into three classes relating to mountains, coastal areas, and plateaus. However, their distribution over the area under consideration is unclear and fails to indicate sharply delimited groupings.
Tensor-product model-based control of two-dimensional aeroelastic system

Use of a recently introduced numerical robust-control design method to stabilize aeroelastic systems according to different control specifications is studied. This numerical design is based on the tensor-product model transformation and the parallel-distributed-compensation design framework. An alternative description of aeroelastic models is also proposed as a gateway to various recent linear-matrix-inequality-based control theories. This study is conducted through an example that focuses attention on the state-variable-feedback controller design to the prototypical aeroelastic wing section with structural nonlinearity. This type of model has been traditionally used for the theoretical as well as experimental analysis of two-dimensional aeroelastic behavior and exhibits limit-cycle oscillation without control effort. Numerical simulations to provide empirical validation of the resulting controllers are presented. Comparison to former alternative control solutions is also presented.