Miracle-dz/UniFAR-FTUs huggingface dataset:
What Information Does Risk Neutral Skewness Contain? Evidence From Price Rebounds and Momentum Crashes∗

Positive option-implied risk-neutral skewness (RNS) predicts next-month abnormal underlying stock returns driven by upward rebounds of previously undervalued stocks. The RNS anomaly is strongest in periods of post-recession rebounds when momentum crashes occur. Furthermore, the momentum anomaly is strongest (weakest) in stocks with the most negative (positive) RNS. We generalize our findings to non-optionable stocks by constructing an RNS factor-mimicking portfolio, finding that a momentum strategy that avoids performance reversals has meaningfully superior performance. Our results hold after controlling for trading frictions, firm characteristics, and common risk factors. ∗We thank seminar participants at University of Miami, Santa Clara University, University of Waterloo, Rutgers University, 2018 OptionMetrics Research Conference, Wilfrid Laurier University, University of Toronto, University of Wisconsin Whitewater, Lord Abbett LLC, 2018 ITAM Finance Conference, 2017 FMA Annual Meeting, McMaster University, and Citadel LLC for their helpful comments. All remaining errors are our own. †Miami, FL 33146. Phone: (305) 284-9144. Email: paul.borochin@bus.miami. edu. ‡Whitewater, WI 53190. Phone: (262) 472-1299. Email: zhaoya@uww.edu.
BER PERFORMANCE ANALYSIS FOR MIMO-OFDM IN TIME-VARYING CHANNELS

In orthogonal frequency division multiplexing (OFDM) systems, time varying channels leads to destroy the orthogonality among subcarriers and yielding inter carrier interference (ICI) in OFDM Systems. A time domain approach is used to reduce time variations in ICI-mitigating block. A time domain equalizer (TEQ) is often used at the receiver to mitigate the total response transmission time but the design of TEQ is a difficult task. In this paper, a linear time varying channel is considered to suppress inter carrier interference and to lower computational complexity. The receiver structure of Time domain Synchronous OFDM is able to estimate the linear time varying channels easily, so TDS-OFDM is suitable for proposed ICI mitigation algorithm. Multi input multi output OFDM system (MIMO-OFDM) needed channel estimation based on Linear Time Varying channel model. Two modulations schemes, QPSK and 16 QAM are used in proposed work to improve performance of two parameters bit error rate (BER) and minimum mean square error (MMSE). Simulation results show that the proposed work can sufficiently suppress the ICI in time varying channels by comparing linear time varying (LTV) channel and linear time invariant (LTI) channel in MIMO-OFDM.
Title : Responses of the hyper-diverse community of canopy-dwelling 1 Hymenoptera to oak decline 2 Running title : Canopy Hymenoptera and oak decline 3

37 1. Forest decline and dieback are growing phenomena worldwide, resulting in severe, large38 scale degradation of the canopy. This can profoundly alter forest microclimates and the 39 provision of trophic resources and microhabitats for forest arthropods, especially those 40 dwelling in the canopy. 41 42 2. In 2019, we assessed the effect of oak decline on the community of canopy-dwelling 43 Hymenoptera. We selected 21 oak stands, and 42 plots, located in three forests in France, 44 presenting contrasting levels of decline. Insects were sampled at the canopy level with green 45 multi-funnel and flight-interception traps. 46 47 3. We collected a particularly diverse community of 19,289 insect individuals belonging to 48 918 taxa, eight larval trophic guilds and five nesting guilds. 49 50 4. Oak decline had no effect on the abundance or richness of the overall community, but 51 significantly reshaped the community assemblages. Decline had contrasting effects 52 depending on the taxa and guilds considered. Parasitoids were more abundant at 53 intermediate levels of decline severity. Taxa depending on ground-related resources and 54 microhabitats were promoted. Saproxylic taxa were more diverse while xylophagous insects 55 were negatively impacted. 56 57 5. Reduced leaf area index promoted several guilds, and the diversity of the overall 58 community. While an increasing tree mortality rate enhanced the abundance and diversity of 59 deadwood resources, it had negative impacts on Hymenoptera guilds. Our results suggest 60 that micro-environmental changes at the ground-level due to canopy decline have major 61 cascading effects on the communities of canopy-dwelling Hymenoptera. 62 63 6. Our study highlights the relevance of studying Hymenoptera communities to investigate 64 the outcomes of disturbances on forest biodiversity. 65 66
Regeneration behaviour of agro-industrial based waste materials. Barley husk, wheat bran and oat husk: a frying oil study

This study aims to experimentally evaluate the influence of agro-industrial based wastes on improving the quality of sunflower oil. A synthetic adsorbent and the ashes of barley husk, wheat bran, and oat husk were selected and utilised as filtration-aid adsorbents for the regeneration of used frying oil. The surface properties, crystal morphology, and framework structures of the ash-based adsorbents were characterized, and the mineral compositions of adsorbents were also determined. The results indicate that the crystal structure of adsorbent materials is responsible for its adsorption capacity and removal of impurities from the frying oil. Wheat bran ash was more effective in the adsorption of degradation products from oil, in reducing free fatty acid, p -anisidine values and also in preventing trans-fatty acid formation since it has the highest adsorption capacity and SiO 2 level. Oat husk ash drew more attention due to its largest surface area and ability to reduce the peroxide value of oils. Treatment of frying oil with agro-industrial based ashes have been found to improve the oil quality and exhibit an effect like Magnesol XL.
Indian Journal of Research in Homoeopathy Indian

Abstract BackgroundBackground: Depression is a disorder of major public health importance, in terms of its prevalence and suffering, dysfunction, morbidity and economic burden. Depression is one of the most common conditions for which people seek homoeopathic treatment. ObjectiveObjective: This study is aimed to understand the scope of homoeopathy in depression based on the results of previous studies. MethodsMethods: A study was done to evince the scope of homoeopathic medicines in the treatment of depression. Searches were done in both general and specialised databases. The data were collected from peer-reviewed journals published between January 2001 and January 2021. Efforts were made to identify published articles on ‘depression and homoeopathy, homoeopathy for depression, depressive disorder and homoeopathy, dysthymia in homoeopathy’. ResultsResults: Twenty-one relevant studies were found and included in the review. These included systematic reviews, randomised control trials, observational studies, case series and case reports. Even though the studies considered in the review indicate the effectiveness of Homoeopathy, it is difficult to assess the overall effect of homoeopathy systematically, mostly because of compromised study designs. ConclusionConclusion: This review has helped in synthesising the existing literature on the scope of homoeopathy in the treatment of depression. However, in order to obtain more reliable results, better-designed researches, with long-term follow-ups may be planned.
Frequency of Maxillofacial Injuries and Accompanying Types of Maxillofacial Fractures

Objective: In this study, it was aimed to examine the characteristics, causes of trauma, and age distribution of maxillofacial fractures in patients admitted to the emergency department as a result of blunt maxillofacial trauma. Materials and Methods: Between 01.01. 2015 and 31.12. 2019, 1248 patients who were admitted to the emergency department with maxillofacial trauma were evaluated retrospectively. Patients who underwent CT examination and were diagnosed with fracture were included in our study. Results: The median age of the patients was 32 years, and 71.2 % of them were male. Trauma-related fractures were detected in 239 (19.2%) of 1248 patients with maxillofacial trauma. The affected group of participants comprised of individuals of younger age and male gender. The main mechanisms of trauma were traffic accidents and falls from height. Orbital fractures were the most common, followed by maxillary bone fractures. Severe maxillofacial fractures were often accompanied by traumatic brain injuries. The mortality rate was low (0.4%) in patients with isolated maxillofacial trauma compared to patients with polytrauma (16%) ( p= 0.001). In our study, it has been shown that face AIS (Odds ratio: 2.79) and Glasgow coma score (Odds ratio: 0.98) can predict mortality in trauma patients with multivariable regression analysis. Conclusion: As a result of this study, we determined the relationship between variables associated with common traumatic injury in the maxillofacial region. Age, gender, and injury mechanism are of great clinical importance in the identification and prediction of traumatic maxillofacial fractures.
Axisymmetric Balance Dynamics of Tropical Cyclone Intensification and Its Breakdown Revisited

This paper revisits the evolution of an idealized tropical cyclone–like vortex forced by a prescribed distribution of diabatic heating in the context of both inviscid and frictional axisymmetric balance dynamics. Prognostic solutions are presented for a range of heating distributions, which, in most cases, are allowed to contract as the vortex contracts and intensifies. Interest is focused on the kinematic structure and evolution of the secondary circulation in physical space and on the development of regions of symmetric and static instability. The solutions are prolonged beyond the onset of unstable regions by regularizing the Sawyer–Eliassen equation in these regions, but for reasons discussed, the model ultimately breaks down. The intensification rate of the vortex is essentially constant up to the time when regions of instability ensue. This result is in contrast to previous suggestions that the rate should increase as the vortex intensifies because the heating becomes progressively more “efficient” when the local inertial stability increases. The solutions provide a context for reexamining the classical axisymmetric paradigm for tropical cyclone intensification in the light of another widely invoked intensification paradigm by Emanuel, which postulates that the air in the eyewall flows upward and outward along sloping absolute angular momentum (M) surfaces after it exits the frictional boundary layer. The conundrum is that the classical mechanism for spinup requires the air above the boundary layer to move inward while materially conserving M. Insight provided by the balance solutions helps to refine ideas for resolving this conundrum.
MACROECONOMICS FACTOR: THE IMPACT ON STOCK PRICE INDEX

The objective of this study is to determine the link between macroeconomic variables and JCI, STI, and KLSE which are the stock price indexes of Indonesia, Singapore, and Malaysia stock price indexes. Multiple linear regression is used to investigate the influence of four macroeconomic factors on the stock market composite index, namely GDP growth, broad money (money supply), inflation, and interest rate spread. The finding indicates that inflation has a negative effect, while interest rate spread positively affecting the stock price Indexes. Investors may profit from this situation by purchasing blue chips when inflation and interest rates are rising. Keywords: GDP growth, inflation, interest rate spread, money supply, stock price indexes
The Implication of Cooperative Integrated Reading and Composition (CIRC) Technique on English Reading Comprehension for Madrasah Aliyah Students

The objective of this study was to find out whether or not there was an effect of the Cooperative Integrated Reading and Composition (CIRC) Technique on Students Reading Comprehension in understanding the Narrative text at MA Pancasila Bengkulu City. In this study, researcher used a Quasi Experimental research nonequivalent pretest-posttest control group. The population of this research was the tenth grade students at MA Panacasila Bengkulu. The sample was X MIPA.1 which was treated as experimental class and taught by using CIRC Technique and X MIPA.2 was treated as control class and taught by using conventional strategy. There were 30 students who were sampled as 19 experimental classes and 19 control classes. To determine the sample, the researcher used Total sampling technique. In the process of data collection, researcher used test and documentation as research instruments. The test take form of multiple choice containing 20 questions. Test is given to both experimental and control classes as pre-test and post-test. The data from the pre- test and post-test were examined using the t-test. The result of this research showed that students reading comprehension test for the experimental class's mean score was 54.21, while the control class was 44.47, and for post-test findings reveal that the experimental class has an average value of 80.79, while the control class has an average value of 71.58. The hypothesis test results show that the output of the independent sample t-test (sig. 2-tailed) is 0.001 which is lower than 0.05. So, Ho was rejected and Ha was accepted. In brief, it can be concluded that Cooperative Integrated Reading and Composition (CIRC) Technique can be one of effective ways in teaching reading for tenth grade students in Madrasah Aliyah level. Keywords: Cooperative Integrated Reading and Composition (CIRC), Madrasah Aliyah, Narrative Text Reading Comprehension
EMPIRICALLY ESTIMATED FAR-UV EXTINCTION CURVES FOR CLASSICAL T TAURI STARS

Measurements of extinction curves toward young stars are essential for calculating the intrinsic stellar spectrophotometric radiation. This flux determines the chemical properties and evolution of the circumstellar region, including the environment in which planets form. We develop a new technique using H2 emission lines pumped by stellar Lyα photons to characterize the extinction curve by comparing the measured far-ultraviolet H2 line fluxes with model H2 line fluxes. The difference between model and observed fluxes can be attributed to the dust attenuation along the line of sight through both the interstellar and circumstellar material. The extinction curves are fit by a Cardelli et al. (1989) model and the A V (H2) for the 10 targets studied with good extinction fits range from 0.5 to 1.5 mag, with R V values ranging from 2.0 to 4.7. A V and R V are found to be highly degenerate, suggesting that one or the other needs to be calculated independently. Column densities and temperatures for the fluorescent H2 populations are also determined, with averages of log10(N(H2)) = 19.0 and T = 1500 K. This paper explores the strengths and limitations of the newly developed extinction curve technique in order to assess the reliability of the results and improve the method in the future.
Evaluation of TAPEER daily estimates and other GPM‐era products against dense gauge networks in West Africa, analysing ground reference uncertainty

A series of multi‐platform rainfall estimates is evaluated at the daily 1° resolution over three dense rain‐gauge networks in West Africa, in Niger, Burkina Faso and Benin, for the period 2012–2016. The quality of the ground reference, its dependence on the number of gauges and the consequences on the validation are discussed. The primary objective of this work is the evaluation of the newly released Tropical Analysis of Precipitation with an Estimation of Errors (TAPEER) daily one‐degree rainfall accumulation from the Megha‐Tropiques mission. Several other multi‐platform products, GSMAP, CMORPH, PERSIANN, TMPA and IMERG, are also evaluated over the same area to put TAPEER performance into perspective. For each product only the version that uses solely satellite information (no gauge adjustment) is used. The analysis concentrates on the heart of the rainy season in West Africa, from June to September. TAPEER exhibits good skill over the region, with a high correlation and a good reproduction of the frequency distribution of the rain rates, especially in the Sahelian region – Niger and Burkina Faso – where the biases are close to zero. The bias is stronger (and negative) in Benin. This overall good performance is stable from year to year. The other products exhibit less bias in Benin and more in the Sahel. CMORPH stands out with relatively good correlations, GSMAP slightly less and PERSIANN has a very strong bias in the Sahel. IMERG, analysed over a shorter period, is also promising.
ACCURACY OF CANCER ANTIGEN 125 AND ALBUMIN BEFORE OPERATION TO PREDICT THE OPERATION OUTCOME IN PATIENTS WITH ADVANCED STAGE EPITHELIAL TYPE OVARIAN CANCER

Ovarian cancer is a malignancy that grows and develops in the ovaries with a high mortality rate. Primary debulking surgery (P.D.S.) is diagnostic and therapeutic and has become the standard option. CA-125 levels were increasing with the worsening disease conditions in ovarian cancer. In addition, preoperative albumin levels were strongly associated with worse ovarian cancer outcomes. This study assessed the prediction of CA-125 markers and albumin levels on P.D. S. outcomes. This research is a diagnostic test conducted at Prof. Dr I.G. N.G. Ngoerah Hospital. The study sample consisted of 50 women aged 18 and over who underwent P.D. S. from 2018 to 2020 with P.A. results of advanced stage (III-IV) epithelial-type ovarian cancer. CA-125 and albumin levels were assessed before surgery and compared with the findings of P.D. S. , which were grouped into suboptimal debulking and optimal debulking. There were no significant differences in the characteristics of the two groups. The accuracy of CA-125 levels on the outcome of P.D. S. surgery with a sensitivity of 75.6%, specificity of 55.6%, PPV of 88.6%, N.P.V. of 35.3% and accuracy of 72%. While the accuracy of albumin levels on the outcome of P.D. S. surgery with a sensitivity of 55.6%, specificity of 51.2%, PPV of 20%, N.P.V. of 84% and accuracy of 52%. CA-125 levels were higher in the suboptimal group but not statistically significant, but the sensitivity (70%) and specificity (80%) were still high, so they still have diagnostic value for ovarian cancer. The relationship between albumin levels and ovarian cancer is multifactorial, so it cannot be used to predict surgical outcomes
Effect of Laser and Conventional Office Bleaching and Polishing on the Color Change of Stained Nanohybrid and Microhybrid Composite Resin

Aim The present study investigated the effects of laser and conventional in-office bleaching, and polishing on the color of stained composite resin. Materials and Methods A microhybrid composite (Clearfil AP-X) and a nanohybrid composite (Grandio) were selected. Twenty-four discs (2 × 10 mm) for each composite were prepared. The samples were immersed in coffee solution (25 g of coffee in 250 mL water) for seven days. Then the samples were divided into three groups (n = 8) and the stains were removed using bleaching (with Opalescence Xtra Boost), diode laser irradiation with Heydent material and a Sof-Lex polishing kit. The L ∗a ∗b ∗ color parameters were determined using a spectrophotometer before and after immersion and after stain removal procedures, and the overall color changes (ΔE) were calculated. The data were analyzed with two-way analysis of variance. Results In the Clearfil composite resin group, the mean ΔE compared to the baseline using in-office bleaching, laser irradiation, and Sof-Lex polishing kit were 3.31, 3.35, and 4.93, respectively. These values with the Grandio composite resin were 3.31, 6.35, and 4.57, respectively. The highest capacity to remove stains was related to the conventional in-office bleaching method. Grandio composite resin underwent more color changes than Clearfil composite resin significantly (P-value < 0.05). Conclusion Both composite resins exhibited color changes after immersion in the discoloring solution. However, after staining-removing procedures, the ΔE values decreased. Decreases in the ΔE values were not sufficient to restore the color to that before immersion in the discoloring solution with any stain-removing methods.
Blended learning for engineering education 4.0: Students' perceptions and their learning difficulties

Engineering education plays a vital role in nurturing high‐quality engineers to meet the demands of the industry. The advancement in Information and Communication Technology (ICT) has provided greater potential as a supporting tool in engineering education. Previous research has emphasized the need to further investigate the learning difficulties faced by engineering students to enhance their learning experience. Although the implementation of blended learning using the flipped classroom approach has gained popularity in tertiary education, there is a lack of research on students' perception of this approach in engineering education. This exploratory study focuses on the Engineering domain, specifically investigating students' learning difficulties in Mechanics Dynamics and their attitudes toward blended learning using the flipped classroom approach in engineering education. Using data collected from 121 students at Universiti Tenaga Nasional (UNITEN), Malaysia, this study employed descriptive statistics and multiple linear regression to analyze the data. Three models related to students' learning difficulties were proposed based on the outcomes of exploratory factor analysis. The results indicate that students encountered difficulties in learning Mechanics Dynamics, particularly in visualizing concepts and solving problems involving three dimensions. The findings and analysis demonstrate significant results (p < .05), supporting the hypotheses of the three proposed models. Additionally, the majority of students (66.1%) exhibited a positive attitude toward the use of the flipped classroom approach in engineering courses. The research findings serve as a preliminary requirement for the development of a software prototype to investigate the efficacy of the flipped classroom approach in engineering courses.
A superlinearly convergent hybrid algorithm for solving nonlinear programming

In this paper, a superlinearly convergent hybrid algorithm is proposed for solving nonlinear programming. First of all, an improved direction is obtained by a convex combination of the solution of an always feasible quadratic programming (QP) subproblem and a mere feasible direction, which is generated by a reduced system of linear equations (SLE). The coefficient matrix of SLE only consists of the constraints and their gradients corresponding to the working set. Then, the second-order correction direction is obtained by solving another reduced SLE to overcome the Maratos effect and obtain the superlinear convergence. In particular, the convergence rate is proved to be locally one-step superlinear under a condition weaker than the strong second-order sufficient condition and without the strict complementarity. Moreover, the line search in our algorithm can effectively combine the initialization processes with the optimization processes, and the line search conditions are weaker than the previous work. Finally, some numerical results are reported.