Miracle-dz/UniFAR-FTUs huggingface dataset:
Pixel Antenna Optimization Based on Perturbation Sensitivity Analysis

Pixel antennas provide a straightforward method for antenna design that can meet a given set of specifications. A key step in the design of pixel antennas is the optimization of the hardwire connections between the pixels in the antenna. Due to the very large number of possible pixel connection combinations, this optimization needs to be performed by heuristic algorithms. In this work, the sensitivity analysis is proposed for the efficient optimization of pixel antennas. In the approach, each individual pixel of the antenna is perturbed in turn to obtain the sensitivity vector of the objective function. The sensitivity analysis at each step is performed efficiently through the use of algebraic simplification that avoids matrix inversion and leads to a significant saving in computational load. The optimization process then selects the perturbation with the greatest sensitivity. Two examples are provided to demonstrate the performance of the proposed optimization method. For both examples, the proposed approach performs the optimization with significantly fewer iterations and either achieves a better or similar minimum in the objective function compared to genetic algorithm approaches. Combined with the efficient computation of the sensitivity vector, significant savings in the computational load are achieved compared to existing approaches.
Dynamic Employee Engagement and Corporate Creativity: Theoretical and Extant Literature Approach

examples in data, ever-expanding rivalry among firms, changes in data bundling and methods of access, the broad effects of innovation have all required a more noteworthy requirement for constant innovativeness and development in all activities today. Be that as it may, innovativeness and development can neither be forced nor driven by separated representatives. A worldwide exploration by Gallup (2005) announced that lone 29% of organization workers are locked in while others are either somewhat connected with or totally separated. Without a doubt, earlier investigations insisted that withdrew workers are a risk to the association and scarcely rock the boat while connected with representatives show enthusiastic Abstract: The study examined dynamic employee engagement and corporate creativity using theoretical and extant literature approach. The objectives of the study are to; examine the influence of meaningfulness of work on corporate creativity, employee’s commitment on corporate creativity and conducive atmosphere on corporate creativity. Theoretical and extant literatures were extensively reviewed. It was discovered from the review of extant literature that conducive and empowering atmosphere in the workplace have positive relationship with employee creativity, employee engagement not only in the area of high productivity but also helps to generate high profit. Corporate creativity, innovation and high customer satisfaction and empowerment leads to autonomous motivation which has positive relationship with corporate creativity. The study therefore, concludes amongst others that; meaningfulness of work, commitment and conducive atmosphere are not only relevant in enhancing employee engagement but are also significant in encouraging corporate creativity and innovation. Also, ensuring the concept of employee engagement in the workplace will help to unleash corporate creativity in the workplace.
Time Series Trend and Variability Analysis of Temperature and Rainfall in West Shewa Zone of Oromia, Ethiopia

BackgroundThe paper focus on time series trend and variability analysis of observed rainfall and temperature records from 16 stations during 1985-2015. ResultsBoth the summer and annual rainfall have an increasing trend but not statistically significant. Regards to variability, low to very high levels of variability were recorded according to the seasons and annual rainfall, whereas, moderate to extremely high levels of variability were observed. The result of the Mann Kendall test portrays that the mean minimum temperature was raised by 0.05 oC, while the maximum temperature was increased rose by 0.03 oC/30 years. The monthly maximum temperature also shows an increasing trend with the lowest record during August (22.05 oC) and the highest in the March (26.49 oC) except in the month of November and December. Similarly, an increasing trend was observed with a mean monthly minimum temperature with the lowest mean of 8.42Co in December and the highest mean of 11.12 oC recorded in April. Besides, a low level of variability was seen both in the case of minimum and maximum temperature were observed in all months. ConclusionsTherefore, since the observed trends of both temperature and total rainfall show abnormal shifts, there is an urgent need for policymakers to design systematic planning and management activities to rain-fed agriculture.
Anti-SARS-CoV-2 antibodies frequency in non-Health Care Workers in a highly industrialized province of northern Italy

: We estimated the frequency of anti-SARS-Cov-2 antibodies in non-Health Care Workers (non-HCW) of the highly industrialized province of Modena, northern Italy. Samples were collected during a voluntarily screening campaign provided by several companies of this territory from 18th May to 5th October 2020. Antibodies were found in 1103 workers, 0.45% of the total number of non-HCWs in Modena province (about 246.000). The positive workers were mainly engaged in manufacture (60%), trade sector (12%), transport (9%), scientific and technical activities (5%), arts, sports and recreation activities (4.5%). In data evaluation, lockdown-related closing of several potentially at risk activities deserves consideration.
Electric field effect on exchange interaction in ultrathin Co films with ionic liquids

Electric-field modulations of magnetic properties have been extensively studied not only for practical applications but also for fundamental interest. In this study, we investigated the electric field effect on the exchange interaction in ultrathin Co films with ionic liquids. The exchange coupling J was characterized from the direct magnetization measurement as a function of temperature using Pt/ultrathin Co/MgO structures. The trend of the electric field effect on J is in good agreement with that of the theoretical prediction, and a large change in J by applying a gate voltage was observed by forming an electric double layer using ionic liquids.
The Impact of Regulations on Small Firm Characteristics

Regulations are shown to have a significant impact on entrepreneurial activity, especially on startups by smaller firms. Higher compliance costs are shown to deter small firms entering a new industry. In this study, using state-level regulation data in the U.S., we examine whether different types of regulations (including “health and safety regulations”, “employment regulations”, “tax code”, “licensing regulations”, “environmental regulations”, and “zoning regulations”) in each state deter smaller firms to do business in that state. We also examine whether each type of regulation deters firms to do business in certain industries or to operate in more or fewer states. Besides size, operational area, and industry, we also examine whether each type of regulation deters younger firms to do business in each state. Our results show that “health and safety regulations”, “employment regulations”, “tax code”, “licensing regulations”, and “environmental regulations” in a state affect firm size and industry, but do not affect operational area and firm age. In the states with high scores in these areas, there are fewer single-employee firms but more 2-20 employee firms when compared to the other states. Also, in the states with a high score in “environmental regulations”, we find fewer firms with 51 to 100 employees when compared to the other states. On the other hand, “zoning regulations” affect firm age and industry, but not operational area and firm size. In the states with high scores in “zoning regulations”, we find fewer firms that are established less than a year ago. Finally, in the states with high scores in regulations, generally, we find that more firms are in the “Business” industry and fewer firms are in the “Writing” industry. Overall, we show how each type of regulation deter certain types of firms operating in each state. This is important because if a state wants to attract certain types of firms (i.e., younger, or older firms, larger or smaller firms, or firms in certain industries), the officials in that state need to improve the corresponding regulations first.
Adverse events of fecal microbiota transplantation: a meta-analysis of high-quality studies

Background Fecal microbiota transplantation (FMT) has shown excellent efficacy in treating Clostridioides difficile infection, as well as promise in several other diseases. The heightened interest is accompanied by concerns over adverse events (AE) and safety. To further understand that in FMT, we performed a systematic review of the literature and a meta-analysis of high-quality, prospective randomized controlled trials FMT. Methods Studies were selected based on predefined exclusion criteria and were assessed for quality. Only prospective, randomized, controlled studies of high quality were included in the final analysis. Data were extracted on demographics, AE, indication, delivery method and follow-up duration. Results Out of 334 articles reviewed, 9 high quality studies with 756 FMTs were selected for final analysis. The pooled rate of AE was 39.3% (95% confidence interval [CI] 0.19-0.642) as they were reported by 112 patients who received FMT. The SAE rate was 5.3% (95%CI 3.1-8.8%). The most common AE reported was abdominal pain, followed by diarrhea. The most common SAE was Clostridium difficile infection. Upper gastrointestinal tract delivery was associated with a higher rate of total AE, but not SAE. Conclusions Based on the selected studies, the AE rate of FMT is 39.3%, with most AE being mild and self-limiting. SAE were uncommon at 5.3%, and many were only possibly related to the FMT. Adherence to standardized reporting of AE as well as longitudinal studies and registries will help further clarify the safety of FMT in the future.
Magnetic properties and structural characterization of layered (Cr0.5Mn0.5)2AuC synthesized by thermally induced substitutional reaction in (Cr0.5Mn0.5)2GaC

The magnetic properties of the new phase (Cr0.5Mn0.5)2AuC are compared to the known MAX-phase (Cr0.5Mn0.5)2GaC, where the former was synthesized by thermally induced substitution reaction of Au for Ga in (Cr0.5Mn0.5)2GaC. The reaction introduced a lattice expansion of ∼3% along the c-axis, an enhancement of the coercive field from 30 mT to 140 mT, and a reduction of the Curie temperature and the saturation magnetization. Still, (Cr0.5Mn0.5)2AuC displays similar features in the magnetic field- and temperature-dependent magnetization curves as previously reported magnetic MAX phases, e.g., (Cr0.5Mn0.5)2GaC and (Mo0.5Mn0.5)2GaC. The work suggests a pathway for tuning the magnetic properties of MAX phases.
Caracterización de pigmentos extraídos de algas rojas de la Antártida para su posible uso en celdas solares del tipo DSSC

En este trabajo se realizo la extraccion en medio acuoso de ficoeritrina proveniente de algas rojas de la Isla Rey Jorge. Las especies que mostraron mejores rendimientos de extraccion fueron Palmaria decipiens y Delesseria lancifolia. Esta ficoeritrina mostro un comportamiento adecuado para su uso como sensibilizador en celdas de tipo DSSC (dye sensitized solar cells), con altos valores de absorbancia, buena estabilidad con la temperatura y adecuado potencial redox.
Maximal Density of Integral Sets with Missing Differences and the Kappa Values

Let $M$ be a given set of positive integers. A set $S$ of nonnegative integers is said to be an $M$-set if $a,b \in S$ implies $a-b \notin M$. In an unpublished problem collection, Motzkin asked to find maximal upper asymptotic density, denoted by $\mu(M)$, of $M$-sets. The first published work on $\mu(M)$ is due to Cantor and Gordon in 1973, in which, they found the exact value of $\mu(M)$ when $|M| \leq 2$. In fact, this is the only general case, in which, we have a closed formulae for $\mu(M)$. If $|M| \geq 3$, then the exact value of $\mu(M)$ is not known for the general set $M$. In the past six decades or so, several attempts have been given to study $\mu(M)$ but $\mu(M)$ has been found exactly or estimated only in very few cases. In this paper, we study $\mu(M)$ for the families $M = \{ a,a+1,x \}$ and $M = \{ a,a+1,x,y \}$, where $y-x \leq 2$ and $y \gt x \gt a+1$. Our results in the case of $M = \{ a,a+1,x \}$ also give counterexamples to a conjecture of Carraher. Although, different counterexamples to this conjecture, were already given by Liu and Robinson in 2020. We also relate our results with the already know results for the families $M = \{ 1,2,x,x+2 \}$ and $M = \{ 2,3,x,x+2 \}$.
Structural Insights into Virulence Regulation in Yersiniae and Polyketide Synthase Systems

RovA is a central Regulator of Virulence genes in pathogenic Yersiniae In this work, the structure of RovA in complex with DNA was solved showing how RovA interacts with the DNA. The few specific interactions with the bases of the DNA explain how RovA can bind to several different binding sites in the bacterial genome. Several small molecules such as salicylate were found to bind to RovA. Additionally, the structure of RovA in complex with salicylate was solved. This showed two salicylate molecules bound per RovA monomer. Additionally, another protein from this regulatory network, RovM, was analysed biophysically in this work. It was possible to show that full length RovM is a tetramer in solution, whereas its effector binding domain (RovM-EBD) exists as a dimer. Furthermore, the structure of RovM-EBD was determined comprising two domains. A cavity was detected between the two domains that could bind a potential inducer molecule. The second topic of this thesis deals with the structural investigation of proteins involved in polyketide synthesis. The building blocks for this are often generated by dedicated enzymes, called crotonyl-CoA carboxylase/reductases (CCR). In this work, such an enzyme (CinF) that catalyses the conversion of octenoyl-CoA to hexyl-malonyl-CoA was analysed. The structure of CinF was solved in complex with its ligands NADP and octenoyl-CoA. It was possible to propose a reaction mechanism for this unusual carboxylation reaction and to determine amino acids that are involved in the selection of the substrate. Additionally, the thioesterase domain from the spirangien PKS biosynthesis cluster (SpirTE) was crystallized. The structure of SpirTE showed a substrate tunnel spanning the whole of the protein which harbours the active site in the middle. Compared to structures of TE domains which catalyse cyclisation SpirTE has a much more constricted substrate tunnel which could prevent the looping of the substrate and thereby its cyclisation.
Covid 19 pandemic and Abnormal Stock Returns of listed companies in Vietnam

Abstract Covid-19 pandemic is affecting the health of the public, and it is also impacting business and economy. The main objective of this paper is to investigate the impact of Covid-19 pandemic on listed firms’ performance and the abnormal stock returns in Vietnam. To study the impact of Covid-19 on firms’ performance, we collected data about announced earnings on Q1/2020 and Q4/2019 of 714 enterprises and made comparison. The results revealed the enormous impacts of Covid-19 pandemic on the business performance. However, the level of influence varies among sectors. To study the impact of Covid-19 on the abnormal stock returns, the study employed the event research method with 3 events related to Covid-19 pandemic in Vietnam. A sample of 364 companies listed on Ho Chi Minh Stock Exchange (HOSE) was utilized. The findings revealed that the Covid-19 event affects the abnormal returns of stocks and the level of influence varied from each stage of Covid-19 prevention measure in Vietnam. The degrees of influence of the Covid-19 event on each stock were also different. The paper concluded that Covid-19 pandemic information can be used to predict stocks’ prices.
Slurry injection with nitrification inhibitor in maize: Plant phosphorus, zinc, and manganese status

ABSTRACT Slurry injection below the maize (Zea mays L.) row may substitute a mineral nitrogen (N) phosphorus (P) starter fertilizer (MSF) and thus reduce nutrient surpluses in regions with intensive livestock husbandry. We investigated the plant P, zinc (Zn), and manganese (Mn) status compared to the current farm practice. In 2014 and 2015 field trials were conducted to evaluate plant nutrient status at different growth stages. Besides an unfertilized control, two slurry injection treatments (±nitrification inhibitor (NI)) were compared to slurry broadcast application plus MSF. In both experiments NI addition significantly increased nutrient concentrations during early growth (6-leaf 2015: +33% P, +25% Zn, +39% Mn). Under P deficiency due to cold weather conditions broadcast application showed higher P uptake until 6-leaf (36–58%), while it was lower at 8- (32%) and 10-leaf (19%) stage compared to slurry injection (+NI). Zn availability was enhanced for slurry injection (+NI) during early growth and Zn and Mn uptakes were higher at harvest. Slurry injection decreased P balances by 10–14 kg P ha−1, while Zn and Mn balances were excessive independent of treatments. Slurry injection (+NI) can substitute a MSF without affecting early growth and enhances the Zn and Mn status. This new fertilizing strategy enables farmers to reduce P surpluses.
Blockchain-Based Pseudonym Management Scheme for Vehicular Communication

A vehicular ad hoc network (VANET) consists of vehicles, roadside units, and other infrastructures that communicate with each other with the goal of improving road safety, reducing accidents, and alleviating traffic congestion. For safe and secure operation of critical applications in VANET, it is essential to ensure that only authenticated vehicles can participate in the network. Another important requirement for VANET communication is that the privacy of vehicles and their users must be protected. Privacy can be improved by using pseudonyms instead of actual vehicle identities during communication. However, it is also necessary to ensure that these pseudonyms can be linked to the real vehicle identities if needed, in order to maintain accountability. In this paper, we propose a new blockchain-based decentralized pseudonym management scheme for VANET. This allows the vehicles to maintain conditional anonymity in the network. The blockchain is used to maintain a record of each vehicle and all of its pseudo-IDs. The information in the blockchain can only be accessed by authorized entities and is not available to all vehicles. The proposed distributed framework maintains an immutable record of the vehicle data, which is not vulnerable to a single point of failure. We compared the performance of the proposed approach with a traditional PKI scheme and shown that it significantly reduces the authentication delay.
Mining and Mental Health – The Effects of the Fundão Dam Collapse

We compared the living and working conditions and mental health between miners who worked in Mariana when the Fundão dam broke, to other miners who worked in another city. We based our work on the ecological, social causation, biopsychosocial models, and other contributions. We applied the General Health Questionnaire-12, Rosenberg’s self-esteem scale, and the Work-Family Conflict scales to 164 miners, interviewing 25 of them. We observed that the living and working conditions of the miners of Mariana differ unfavorably and are more prone to common mental disorders. The impoverishment of the social environment, the loss of social support, the increasing conflicts in families , the attribution of guilt for the dam collapse, and the economic decline of the city contributed to accentuating feelings of malaise, depression, and anxiety.
Determining effects of nutrient solution electrical conductivity and daily light integral on the growth of specialty leafy greens

Controlled environment agriculture (CEA) operations are expanding the ways food is being grown and the food crops that are grown in the US. Hydroponic production of nutrientdense leafy greens is becoming increasingly popular for bringing food production closer to consumers in metropolitan areas. There is a need for empirical data regarding the production of these specialty leaf greens in CEA. In the experiments outlined in this thesis, we sought to determine the effects of electrical conductivity (EC) of nutrient solution and daily light integral (DLI) on the growth and development of arugula, swiss chard, pac choi, and kale. In our first experiment, we explored the effects of nutrient solution EC on the growth and tissue nutrient content of these specialty leafy greens grown in deep flow technique hydroponic systems. We exposed arugula, swiss chard, pac choi, and kale to ECs of 0.5, 1.0, 2.0, 3.0, 4.0, or 5.0 dS∙m1. Our results show growth response due to EC differs among species, but the growth of all species was not promoted at an EC over 2.5 dS∙m. Arugula and pac choi can be grown at lower ECs of 1.0 to 2.0 dS∙m whereas swiss chard does best at 2.5 dS∙m. Growth of kale was unaffected by EC, but we recommend kale be grown at any EC between 1.0 and 5.0 dS∙m to mitigate S deficiency. In our second experiment, our goal was to quantify the growth response of arugula, swiss chard, pac choi, and kale as DLI increases from 2 to 22 mol∙m∙d. For all species, growth increases with DLI. We found that arugula reaches its maximum yield at a DLI of 18 mol∙m∙d . Although we did not reach growth maxima for any of the other crops tested, we did observe occurrence of tipburn on pac choi when the DLI exceeded 15 mol∙m∙d.
Potential of electric fields to reduce bycatch of highly threatened sawfishes

: Sawfishes are among the most threatened families of marine fishes and are susceptible to incidental capture in net fisheries. Since bycatch reduction devices currently used in trawl fisheries are not effective at reducing sawfish catches, new methods to minimise sawfish bycatch are needed. Ideally, these should affect sawfish behaviour and prevent contact with the fishing gear. We tested the effects of electric fields on sawfish behaviour to assess the potential of electric pulses in mitigating sawfish bycatch. Experiments were conducted in a tank where 2 electrodes were suspended in the water column, connected to a pulse generator, and placed across the swimming path of sawfish. Two largetooth sawfish Pristis pristis were tested in control conditions, in the presence of a baseline pulse, and of 5 variations of that pulse where 1 parameter (polarity, voltage, frequency, pulse shape, pulse duration) was altered at a time. Conditional inference trees were used to identify the effects of various parameters (e.g. treatment, individual) on reaction type, re action distance, twitching presence and duration, and inter-approach times. Sawfish reacted to electric fields, but reaction distances were small (typically <1.2 m), and no field tested consistently led to reactions conducive to escaping from moving nets. The following parameters induced the most response in both individuals: bipolar current, rectangular shaped, 5−10 Hz, ~1500 μs duration, and 100 V. We recommend further research focussing on moving nets, testing a V-shaped electric array preceding the net mouth by at least 5 m, and testing a setup similar to electrotrawling.