Miracle-dz/UniFAR-FTUs huggingface dataset:
How Beneficial are Recommendations to Consumers? Estimates of Relative Benefits of Product Recommendations to Consumers and Retailers

Do personalized offerings enabled by big data only bring economic benefits to firms but not to consumers? In this paper, we seek to address this question by examining a particular category of personalized offerings provided by algorithmic product recommendation systems. While the economic value of algorithmic product recommendations to firms is mostly understood, their benefits to consumers are not well quantified in the literature. We conduct a randomized field experiment on an apparel retailer’s website in the US to estimate the benefits of recommendations to consumers. We find that recommendations helped consumers discover lower-priced products on the website, which results in a higher probability of product purchase (lower likelihood of failed search efforts) and a lower price of purchased products. Specifically, an additional recommended product page view due to recommendations leads to a 15 percent increase in purchase probability and a $1.59 decrease in the purchase price. The product recommendations are particularly beneficial to consumers for product categories with a higher relative price dispersion and a higher proportion of niche products. Due to these benefits, consumers substitute 0.14 keyword search page views and 0.63 product category page views for each recommended product page view under recommendations. The recommendations generated a surplus of $56,631 (3.8 percent of the total sales), two-thirds of which the retailer captured as additional revenue, and the remaining one-third the consumers as price savings.
The relationship between smoking degree based on the Brinkman index with the neutrophil lymphocyte ratio, lymphocyte platelet ratio and serum MPV/platelet values in healthy adult smokers

Smoking has been shown to increase systemic inflammation. Platelet lymphocyte ratio (PLR) and mean platelet volume (MPV) are indicators of increased platelet activation associated with venous thromboembolic events (VTE). We aim to determine the relationship between smoking degree based on the Brinkman index and the level of inflammation. An observational analytic study using a cross-sectional approach was conducted from October to December 2019 involving all adult smokers in the city of Denpasar, Bali, who meet the inclusion and exclusion criteria. Correlation test was used to determine the relationship between smoking degrees and NLR, PLR, and MPV/platelets in the subject. It was found that the research subjects had an average age of 37.13 years. Brinkman Index (IB) obtained IB 25-1000 (average 275.5506), with the ratio of mild: moderate: severe degrees are 44:45:11 people. The serum NLR value was 0.09 to 4.49 (mean 1.6633), PLR value was 47.97 to 188.81 (mean 104.4154), and MPV/Plt value 0.02 to 0.08 (mean 0.03). The degree of smoking based on the Brinkman Index in 100 samples, consisting of 44% of light smokers, 45% of moderate smokers and 11% of heavy smokers. Heavy smokers have higher NLR and PLR and lower MPV/Plt. There was no significant relationship between smoking degrees and NLR, PLR, and MPV/Plt (P = 0.494: 0.557: 0.776). All smokers classified as normal nutritional status (22%) and overweight (78%). The Spearman test showed that there was a significant relationship between smoking age and smoking degree (P = 0.000), but none for nutritional status (BMI) and smoking degree (P = 0.155). Pearson correlation test showed that the age of the smoker have no relationship with the ratio of NLR, PLR and MPV/Platelet (P = 0.670: 0.878: 0.229). T-Test result showed no relationship between NLR and PLR with nutritional status (P = 0.074: 0.116). The Mann-Whitney test also showed no relationship between MPV/Plt and nutritional status (P = 0.498). In conclusion, the higher the degree of smoking based on the Brinkman index, the higher the NLR and PLR values. There was no significant relationship between smoking degrees based on the Brinkman Index and serum NLR, PLR, and MPV/Platelet in healthy adult smokers.
Localização e Dimensionamento Ótimos de Turbinas Eólicas para Minimizar as Perdas de Energia em Sistemas Radiais de Distribuição

O sistema de distribuicao vem sofrendo mudancas ao longo dos anos, principalmente no que diz respeito ao aumento da insercao da geracao distribuida. Portanto, se faz necessario um estudo de localizacao otima e de seu dimensionamento. A energia eolica e uma das que mais cresce no Brasil e foi escolhida para o presente estudo. Para resolver parte do problema da insercao das unidades geradoras no sistema de distribuicao, foi elaborado um algoritmo de busca por meio da tecnica de otimizacao chamada Algoritmo Genetico e do Metodo da Soma de Potencias. O objetivo e localizar e dimensionar turbinas eolicas nas barras dos sistemas para que possam reduzir as perdas de energia do sistema e melhorar o perfil de tensao, nao ultrapassando os limites de tensao impostos pela ANEEL, nem ultrapassando 30% de penetracao de geracao eolica referente a demanda anual de energia. Os resultados obtidos demonstraram a eficacia e a viabilidade do metodo para o uso em sistemas de pequeno e grande porte.
Preparation Technology of Carbon Nanotube LB Films

In this paper we made carbon nanotube (CNT) carboxyl modified with acid,and then functionalized CNT with octadecylamine(ODA). Extensive study has been performed to the Langmuir-Blodgett (LB) films preparation of functionalized CNTS. The effects of hypersonic time, acid quantity, oxidation and other experimental factors on preparation were discussed in detail. Monolayer and multilayer CNT LB films were prepared to study the antifriction of CNT LB film on silicon. The results show that,under certain experimental conditions,CNTS could be functionalized by ODA,which has both hydrophilic and hydrophobic groups. The solubility of functionalized CNTS in organic solvents is remarkably improved because of the existence of hydrophobic groups, which makes it possible to prepare CNT LB films. This kind of CNT LB film can improve the wear-resistance of silicon by over 50% under lower load.
Application of individual educational trajectories and adaptive content in engineering education

The article explores the educational technology of personalized training in the training of engineers. A hypothesis is presented on the relationship between the quality of student preparation and the individual educational trajectory reinforced by feedbacks. The use of new pedagogical technologies based on machine learning and big data is proposed. An algorithm for creating personalized educational systems is defined.
In Vitro Investigation of the Effect of Different Remineralizing Agents on Human Enamel

This in vitro study aimed to qualitatively evaluate the effect of different remineralizing agents on the enamel pattern, after exposure to an acid solution. Fifteen human sound extracted third molars were collected and randomly allocated into the following five groups: Control Group (CG), without treatment; Negative Group (NG), treated with lactic acid solution; Mousse Group (MG), treated using a mousse of casein phosphopeptide (CPP) and amorphous calcium phosphate (ACP), associated with 0,33% sodium monofluorophosphate; Biosmalto Group (BG), treated with a dentifrice containing amorphous calcium phosphate functionalized with fluorine and carbonate-coated with citrate; Duraphat Group (DG), treated with a 5% sodium fluoride varnish. While CG remained immersed in chloramine solution for the entire period of the study, all the other groups were immersed in lactic acid for 2 hours and then subjected to the appropriate treatment for additional 2 hours, repeating the protocol 3 times a day, for 8 days. Finally, all samples were examined by Scanning Electron Microscope (SEM). SEM micrographs showed that CG had the typical morphological features of sound enamel, whereas NG presented superficial irregularities with early pattern of demineralization, characterized by apparent destruction of enamel prism cores. MG showed intact enamel prismatic arrangement and slight interprismatic dissolution, while BG and DG presented not defined margins of enamel prims and partial loss of interprismatic substance, being more pronounced in DG. Qualitative SEM evaluations demonstrate that topical applications of CPP+ACP associated with sodium monofluorophosphate could represent the most effective protocol for re-establishing the intact enamel structure, given acid environment.
Algoritmo Baseado na Meta-heurística Particle Swarm Optimization para Configuração de Pools de Threads em Motores de Execução de Plataformas de Integração

This paper reports on the experience of using an optimization algorithm to find the optimal configuration of thread pools to run integration processes that receive a large volume of data. Thread pools are computational resources in the runtime system of integration platforms. Execution models based on a single pool of threads have performance problems when used in contexts in which there is a large volume of data. An execution model based on multiple local pools of threads can avoid performance problems, as long as these pools are configured with the ideal number of threads. However, finding that ideal number of threads is not a trivial task, as there is no automatic way to perform this calculation. In this paper we explore the use of the Particle Swarm Optimisation metaheuristic to find the ideal number of threads for each local pool. Resumo. Este artigo relata a experiência de usar um algoritmo de otimização para encontrar a configuração ideal de pools de threads para executar processos de integração que recebem um grande volume de dados. Threads são recursos computacionais no sistema de tempo de execução de plataformas de integração. Os modelos de execução baseados em um único pool de threads apresentam problemas de desempenho quando usados em contextos nos quais há um grande volume de dados. Um modelo de execução baseado em vários pools locais de threads pode evitar problemas de desempenho, desde que esses pools sejam configurados com o número ideal de threads. No entanto, encontrar esse número ideal de threads não é uma tarefa trivial, pois não há uma maneira automática de realizar esse cálculo. Neste artigo, exploramos o uso da meta-heurı́stica Particle Swarm Optimization para encontrar o número ideal de threads para cada pool local.
Preparation and evaluation of perovskite solar cells in the absolute atmospheric environment

Recently solid state hybrid organometal halide perovskite solar cells have become the research hotspot. We fabricated perovskite solar cells by a simple two-step method completely in the regular ambient condition without a glove box, and all materials were just stored in ambient air. The cross-section SEM image of the perovskite solar cells exhibits a well-defined layer-by-layer structure with clear interfaces. XRD pattern shows main diffraction peaks centred at 14.2° (110) and 28.5° (220), which can be assigned to the CH3NH3PbI3 phase, suggesting a crystal structure, and the peak centred at 12.7° is attributed to PbI2. Our best Jsc is 19.2 mA/cm2, the best Voc is 1.0 V, the best FF is 0.65, and the best PCE is 10.2%.
Molecular Characterization of a Variant Subgroup GII-a Porcine Epidemic Diarrhea Virus Strain in China

Background: Since 2010, variant porcine epidemic diarrhea virus (PEDV) has emerged in several provinces of China. The variant strain causes high mortality of newborn piglets, which has resulted in severe economic losses to the pork breeding industry.Results: A variant PEDV strain, SC-YB73, was isolated and identified in China. Pathological observation showed atrophy of villi and edema in the lamina propria. Sequence analysis indicated that six nucleotides were inserted in the E gene, which was first detected in PEDV strains. Furthermore, fifty nucleotide sites were unique in SC-YB73, when compared with another 28 PEDV strains. Phylogenetic analysis based on the complete genome showed that SC-YB73 was clustered in the variant subgroup GII-a, which is widely prevalent in the pig population in China. Recombination analysis suggested that SC-YB73 originated from the recombination of GDS47, TW/Yunlin550/2018, and COL/Cundinamarca/2014.Conclusion: The present study involved the isolation and genetic characterization of a variant PEDV strain. It will provide essential information for the control of PED outbreaks in China.
Cobalt adsorption on the nano-hydroxyapatite matrix: isotherm and kinetic studies

*e-mail: rskhairnarsps@gmail.com Abstract. Cobalt radionuclide is one of the prime contaminants generated during operation of pressurized heavy water. The paper reports the study of cobalt adsorption on hydroxyapatite (HAp) nanoceramic. A modified wet chemical precipitation method is used for HAp synthesis. The HAp nano-material is characterized by XRD, FTIR, TG/DTA, AFM, SEM, and EDAX. Experiments are performed in batches to observe the effect of cobalt adsorption on HAp matrix. The adsorption of cobalt on HAp is examined at room temperature. The isotherm and kinetic studies showed that the Freundlich isotherm and pseudo-second order model are the best choices to describe the nature of adsorption.
Relationship between Carbon Nitride Structure and Exciton Binding Energies: A DFT Perspective

Graphitic (g)-CxNyHz has become a popular element in photocatalytic water splitting cells. Recently, the crystal structures of completely polymerized g-C3N4 and incompletely polymerized g-C6N9H3 crystals based on the triazine and heptazine monomers have been characterized. In this manuscript we evaluate the atomic and electronic nature of these structures using DFT. The study revealed strongly corrugated structures for the fully polymerized g-C3N4 and planar structures for the incompletely polymerized g-C6N9H3. The exciton binding energies of the heptazine-based structures are lower than that of their triazine-based analogues and lower for the completely polymerized structures than their incompletely polymerized analogues. The rather low dielectric constant and charge mobilities result in high exciton binding energies and hence low dissociation probabilities for these excitons. This confirms the necessity of a morphology inspired by bulk heterojunction architectures to ensure efficient charge carrier gene.
Leveraging Conventional Control to Improve Performance of Systems Using Reinforcement Learning

While many model-based methods have been proposed for optimal control, it is often difficult to generate model-based optimal controllers for nonlinear systems. One model-free method to solve for optimal control policies is reinforcement learning. Reinforcement learning iteratively trains an agent to optimize a reward function. However, agents often perform poorly at the beginning of training and require a large number of trials to converge to a successful policy. A method is proposed to incorporate domain knowledge of dynamics and control into the controllers using reinforcement learning to reduce the training time needed. Simulations are presented to compare the performance of agents utilizing domain knowledge to those that do not use domain knowledge. The results show that the agents with domain knowledge can accomplish the desired task with less training time than those without domain knowledge.
High Prf Metal Vapor Laser Active Media For Visual And Optical Monitoring

In this paper the feasibility of using metal vapor lasers for visual and optical monitoring of fast processes is discussed. The theoretical calculations consistent with the experimental study have been performed. The possibility of visualizing objects with pulse repetition frequency of the brightness amplifier up to 60 kHz has been demonstrated. The visualization results of the corona discharge are also given.
Faktor-Faktor yang Memengaruhi Pengungkapan Corporate Social Responsibility

This research is an empirical study that aims to determine the effect of managerial ownership, leverage, profitability, and type of industry on the disclosure of Corporate Social Responsibility (CSR). The population uses all companies listed on the Indonesia Stock Exchange in 2018 and the sample is chosen using purposive sampling. Managerial ownership is measured by the percentage of shares owned by management. The level of leverage is measured by the debt ratio (DER). Profitability is measured by ROA, and industry types are grouped into high-profile and low-profile. CSR is measured by the CSR index, CSRDI. Data were tested for normality, multicollinearity, and heteroscedasticity. Data analysis uses multiple linear regression analysis techniques. The results indicate that managerial ownership has no effect on CSR disclosure. The level of leverage has a negative effect on CSR disclosure. Profitability has a positive effect on CSR disclosure. Industry type has no effect on CSR disclosure. Keywords: Leverage; Profitability; Industry Type; Corporate Social Responsibility.
Association of γ-aminobutyric acid type A receptor-associated protein with prognosis in patients after radical pancreatic cancer treatment

Background：Pancreatic cancer is difficult to cure and many factors influence patient prognosis, of which autophagy is a recent research hotspot, and GABARAP plays a key role in autophagy, which has been found to interfere with cancer cell survival and metastasis in a variety of tumours. In this study, we analysed the correlation between GABARAP and patient prognosis in pancreatic cancer, as well as its correlation with clinicopathological parameters and its impact on the efficacy of chemotherapy in pancreatic cancer patients.Methods: The pancreatic tissues of 76 pancreatic cancer patients after R0 resection were screened according to the criteria, and the expression levels of GABARAP were determined by using immunohistochemistry (MaxVision) to label the pancreatic cancer tissues and normal pancreatic tissue around carcinoma in these two types of specimens, and the relationship between GABARAP and other factors and the disease-free and overall survival of patients after radical pancreatic cancer treatment was evaluated by single factor survival analysis and Cox regression analysis.Results：The expression ratio of GABARAP in pancreatic cancer tissue was drastically higher than that in normal pancreatic tissue adjacent to cancer. Cox regression model evaluation showed that GABARAP and postoperative adjuvant chemotherapy were the overall survival of patients after radical pancreatic cancer Period independent prognostic indicators and both are protective factors for the prognosis of pancreatic cancer patients. Further data analysis found that postoperative chemotherapy drastically increased the total patient Survival period in GABARAP-negative patients but had no drastically effect on the patient's relapse-free survival period.Conclusion: The expression of GABARAP in pancreatic cancer tissues was drastically up-regulated, and patients with high expression of GABARAP in pancreatic cancer tissues had better prognosis, but had no drastically effect on the relapse-free survival of patients after radical operation of pancreatic cancer. The expression of GABARAP in pancreatic cancer tissues and Postoperative adjuvant chemotherapy is an independent indicator of patients' prognosis after radical pancreatic cancer resection. Both are protective factors. The high expression of GABARAP in pancreatic cancer may indicate that the adjuvant chemotherapy is low benefit.
Risk Factors For COVID-19 Positivity in Hospitalized Patients in A Low Prevalence Setting

Background: Identifying hospitalized patients with Coronavirus disease 2019 (COVID-19) in a low prevalence setting is challenging. We aimed to identify differences between COVID-19 positive and negative patients. Methods: Hospitalized patients with respiratory illness, or fever, were isolated in the emergency room and tested for COVID-19. Patients with a negative PCR and low probability for COVID-19 were taken out of isolation. Patients with a higher probability for COVID-19 remained in isolation during hospitalization and were retested after 48 hours. Risk factors for COVID-19 were assessed using logistic regression. Results: 254 patients were included, 37 COVID-19-positive (14.6%) and 217 COVID-19-negative (85.4%). Median age was 76 years, 52% were males. In a multivariate regression model, variables significantly associated with COVID-19 positivity were exposure to a confirmed COVID-19 case, length of symptoms before testing, bilateral and peripheral infiltrates in chest X-ray, neutrophil count within the normal range, and elevated LDH. In an analysis including only patients with pneumonia (N=78, 18 positive for COVID-19), only bilateral and peripheral infiltrates, normal neutrophil count and elevated LDH were associated with COVID-19 positivity. Conclusions: The clinical presentation of COVID-19 positive and negative patients is similar, but radiographic and laboratory features may help to identify COVID-19 positive patients and to initiate quick decisions regarding isolation.
Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties

Abstract. Aouar L, Boukelloul I, Benadjila A. 2020. Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties. Biodiversitas 21: 5672-5683. To produce new bioactive substances of agricultural interest, extreme ecosystems can be a source of unexplored microorganisms. Accordingly, in this study, twenty-two actinobacteria strains were obtained from rhizospheric arid soils of palm groves collected from Biskra and El Oued in the Algerian Sahara. All isolates were examined for the in vitro antifungal potential towards phytopathogenic fungi: Aspergillus flavus, Verticillium dahlia, Rhizoctonia solani, Botrytis cinerea and Fusarium oxysporum as well as for their antibacterial property toward phytopathogenic bacteria: Streptomyces scabiei, Pectobacterium carotovorum and Agrobacterium tumefaciens. The three isolates (13%) that inhibited at least five pathogens were then selected, identified and assessed for their attributes to produce indole-3-acetic acid (IAA) and siderophores, to solubilize phosphate, and to antagonize Streptomyces scabiei in vivo. According to phylogenetic analysis performed with 16S rDNA sequence, chemotaxonomy and phenotypic characteristics, the strain SO1, which inhibited all tested pathogens, was assigned to Streptomyces flaveus. While, strains SO2 and SB1 were affiliated to Streptomyces enissocaesilis and Streptomyces albidoflavus, respectively. All strains produced IAA but only SO1 and SB1 were able to elaborate siderophores catecholate-type. Two strains SO1 and SO2 exhibited a capacity to solubilize phosphate and SO1 was able to suppress the pathogenic effect of Streptomyces scabiei on radish seedlings. The findings indicate that SO1 strain may reveal the potential for use as a biocontrol agent and plant growth promoter.