Miracle-dz/UniFAR-FTUs huggingface dataset:
Visitors' experience at Angkor Wat, Cambodia: evidence from sentiment and topic analysis

ABSTRACT Angkor Wat in Cambodia is one of the most significant archaeological sites in the world inscribed as a UNESCO World Heritage Site. It is also consistently rated as the top Global Landmark by travelers in TripAdvisor. This study employed big data analytics to examine visitor experience via sentiment and topic analysis, given the popularity and volume of visitors annually. The process involved an examination of 32,394 online reviews about Angkor Wat posted between January 2015 and October 2019 on Tripadvisor’s website. The analysis was conducted for reviews with one, two, and three-star ratings, and those with four and five star ratings separately. Results showed highly skewed positive ratings, while similar positive sentiments dominated the reviews. Topic analysis disclosed that sunset and sunrise experience, attraction structure, guided tours, and temple experience were topics attributed mostly to positive sentiments. Conversely, crowding, persistent selling, clothing style, and expenses were illustrated as negative topics. Such insights are useful for managers at Angkor Wat to develop various marketing and management interventions to effectively manage the site and to optimize visitor experiences.
Estrogenic and anti-proliferative activity of water extract of Glycyrhizzic uralensis (licorice root)

Licorice is the root of Glycyrrhiza uralensis , which is a commonly used herb in traditional Chinese medicine. Licorice extract has been claimed to have anti-cancer, anti-viral, anti-inflammatory and anti-diabetic activities. This study evaluated the estrogenic effect of licorice root water extract on Ishikawa cells and related it to its effect on cell proliferation using various cell lines in comparison to glycyrrhizic acid (GA). This study showed that licorice root extract exhibited estrogenic property while decreasing cell proliferation thus suggesting possible use in estrogen replacement agent with anti-proliferative property. Even though GA is the most studied active component in licorice, these two properties were not seen in the cell lines tested; hence suggesting that GA is not responsible for these activities. These results showed that licorice could be further studied as an estrogen replacement agent as it does not cause an increase in cell proliferation in the breast and uterus.
Reflective Case Discussion (RCD) for Nurses : A Systematic Review

Reflection Case Discussion is a method of professional reflection conducted by health workers, usually with nurses, RCD aims to address gaps in nursing theory and practice, expand nurse competencies and knowledge, educational and nursing needs and are an educational responsibility.The aim of this study was to determine the benefits of RCD on nurses themselves, this literature through identification from the Pubmed database, Science direct and online wiley,use the keywords 'Reflection' and 'Case' and 'Nursing'. The method of searching articles uses PICOT technique, Prism Flow diagram, abstraction and synthetic data. Through fulltext screening, double publication and eligibility, 455 research articles were found. The next step is to screen through the inclusion criteria and exclusion criteria so that the final result of the article found is 4 articles. Articles have a lot to explain about the benefits RCD for nurses, RCD can add to the knowledge of nurses, minimize the gap theory and practice so that errors can be resolved. Literature is also finding benefits RCD on nurses is increasing the professionalism of the work and cooperation among fellow colleagues. Implementation of the RCD environment of clinical very ber benefits, but there are some things usually hamper so implementation RCD can be constrained. One of the factors that k eterlibatan participants RCD, the activity of the participants affect the results are desired, by because of the need to do the socialization and DRK are scheduled to be implemented in routine, beside others the support and motivation of the leadership is very necessary, both managers of nursing as well as leaders of the house sick . Availability of facilities and room as well as the burden of work of nurses also become a reason of activities is often overlooked.
Cash level and corporate performance: evidence from the Gulf Cooperation Council countries

This study aims to examine the connection between cash level and corporate performance, as well as the cash level determinants for all nonfinancial firms in the Gulf Cooperation Council (GCC) countries. The empirical analysis employs numerous statistical techniques such as panel regression models and the Generalized Methods of Moments (GMM). The main result of the study confirms a positive relationship between the cash level and both the corporate performance and the firm value, which signifies the role of cash in supporting the corporate productive activities in times of rare cash. The results also show that large firms, especially those with less leverage, experience better corporate performance. Additionally, the results demonstrate that when using different levels of cash holdings as well as different levels of firm size, both the magnitude and the significant positive effect of the cash level on corporate performance and firm value are not altered. For the determinants of the cash level, the results confirm that the most important variables are product competition, free cash flow, corporate liquidity, capital expenditures, and financial constraints. The results do not confirm that the amount of dividend paid has a significant influence on the cash level. All results are robust to the various econometric specifications employed in this study. AcknowledgmentThis study is supported by Kuwait University research sector, grant number IF-03/18.
Chitosan level effects on fermentation profile and chemical composition of sugarcane silage

Foram avaliados os efeitos do aumento dos niveis de quitosana (CHI) sobre o perfil e as perdas fermentativas, a composicao quimica e degradacao in situ da silagem de cana-de-acucar. Os tratamentos foram: 0, 1, 2, 4 e 8 g de CHI / kg de materia seca (MS). Foram utilizados vinte silos experimentais (tubos de PVC com 28 cm de diâmetro e 25 cm de altura). Areia (2 kg) foi adicionada na porcao inferior de cada silo para avaliar as perdas por efluentes e os silos foram pesados 60 dias apos a ensilagem para calcular as perdas por gases. Amostras foram coletadas do centro da massa do silo para avaliar a composicao quimica, degradacao in situ, perfil fermentativo e a contagem de fungos e leveduras da silagem. Os dados foram analisados como um delineamento inteiramente casualizado e o efeito do tratamento foi decomposto usando regressao polinomial. A CHI aumentou linearmente a concentracao de acido acetico e N-NH3, enquanto diminuiu a contagem de leveduras e bolores e a concentracao de etanol. Os niveis intermediarios de CHI (de 4,47 a 6,34 g/kg MS) mostraram os menores valores de perdas por efluentes, gases e totais. Houve efeito quadratico da CHI sobre o teor de carboidratos nao fibrosos, fibra em detergente neutro e acido e sobre a degradacao in situ da MS. Os menores teores de fibras foram observados com niveis de CHI entre 7,01 e 7,47 g/kg MS, enquanto que os maiores teores de carboidratos nao fibrosos e degradacao in situ da MS foram encontrados com 6,30 e 7,17 g/kg MS de CHI, repectivamente. A CHI aumentou linearmente as concentracoes de acido acetico e N-NH3, enquanto reduziu linearmente a concentracao de etanol e a contagem de fungos e leveduras. Desta forma, niveis intermediarios de CHI, entre 4,47 e 7,47 g / kg de MS, diminuem as perdas fermentativas e melhoram o valor nutricional da silagem de cana-de-acucar.
Curricular Knowledge as a Resource for Responsive Instruction: A Case Study

Abstract Responsive instruction—or instruction that foregrounds and takes up the disciplinary substance of student thinking—is both a hallmark of recent STEM education reforms and challenging to enact. This kind of instruction may be especially challenging in instructional contexts that mandate or rely on curriculum with set, structured learning trajectories for students. In this paper, we propose a new component of curricular knowledge—in particular, an understanding of the purposes of questions or sequences of questions in research-based instructional materials. We show that this kind of curricular knowledge supported the enactment of responsive instructional practices among one cohort of 14 undergraduate physics Learning Assistants, illustrating the relationship between curricular knowledge and responsive instruction. We document some of the key phases in and tools that supported the development of this cohort’s curricular knowledge, lending insight into how teacher educators might support the development of curricular knowledge in their own contexts.
α-Linolenic Acid–Valproic Acid Conjugates: Toward Single-Molecule Polypharmacology for Multiple Sclerosis

Multiple sclerosis (MS) is a complex inflammatory, degenerative, and demyelinating disease of the central nervous system. Although treatments exist, MS cannot be cured by available drugs, which primarily target neuroinflammation. Thus, it is feasible that a well concerted polypharmacological approach able to act at multiple points within the intricate network of inflammation, neurodegeneration, and demyelination/remyelination pathways would succeed where other drugs have failed. Starting from reported beneficial effects of α-linolenic acid (ALA) and valproic acid (VPA) in MS, and by applying a rational strategy, we developed a small set of codrugs obtained by conjugating VPA and ALA through proper linkers. A cellular profiling identified 1 as a polypharmacological tool able not only to modulate microglia polarization, but also to counteract neurodegeneration and demyelination and induce oligodendrocyte precursor cell differentiation, by acting on multiple biochemical and epigenetic pathways.
Application of Deep Learning Convolutional Neural Network for Spray Characterization

– The application of a machine learning artificial intelligence (AI) for spray characterization is investigated. Images of sprays in regions where droplet formation has not taken place, therefore not allowing any insight into the spray droplets themselves. The objective is to bridge the gap from the process of droplet formation to the characteristics of the spray that is produced at the end of this process. To achieve this, convolutional neural networks (CNN) are trained to classify images of sprays that were captured at different operating fluid pressures. Even though this is not directly characterizing the spray, it provides evidence for the potential of machine learning methods in spray characterization as distinctions are made prior to spray formation meaning CNNs are able to distinguish patterns in sprays prior to the droplet formation process, hence proving the possibility of bridging the aforementioned gap. Our models were able to accurately identify images of sprays taken at different operating pressures. Moreover, the convolutional neural networks were further analysed to understand how they were able to make these distinctions, that are not easily visible to the human eye. For this gradient class activation maps were determined to understand the inner workings of the convolutional neural networks. These gradient class activation mappings could prove useful in determining new physical patterns that were previously unknown, which could contribute to a better understanding of sprays and the droplet formation process.
Communication, Expectations, and Trust: An Experiment with Three Media

We studied how communication media affect trust game play. Three popular media were considered: traditional face-to-face, Facebook groups, and anonymous online chat. We considered post-communication changes in players’ expectations and preferences, and further analyzed the contents of group communications to understand the channels though which communication appears to improve trust and trustworthiness. For senders, the social, emotional, and game-relevant contents of communication all matter, significantly influencing both their expectations of fair return and preferences towards receivers. Receivers increased trustworthiness is mostly explained by their adherence to the norm of sending back a fair share of the amount received. These results do not qualitatively differ among the three communication media; while face-to-face had the largest volume of messages, all three media proved equally effective in enhancing trust and trustworthiness.
Mapping of Ice Storage Processes on the Moon with Time-dependent Temperatures

Lunar cold traps are defined by extremely low time-integrated sublimation loss, so that water ice is expected to accumulate in them. Due to the strong dependence of the sublimation rate on temperature, they have heretofore been delineated by the peak rather than the time-averaged sublimation rate. Here, time-averaged sublimation rates are calculated for the south polar region of the Moon based on 11 yr of Diviner surface temperature measurements. Data for each spatial pixel are binned according to subsolar (diurnal) and ecliptic (seasonal) longitude. Frequency-domain filtering of temperature time series is applied to interpolate and smooth the data set. The cold trap area is 17,000 km2 from 80°S to the south pole, about 24% larger than defined by peak temperature. In addition, subsurface ice stability is mapped based on solutions of the heat equation with Diviner surface temperatures as the upper boundary condition. Even a thin layer of dust reduces the sublimation loss dramatically. A third potential mechanism for ice storage, vapor pumping by temperature cycles, is also mapped, based on a model for the time-variable population of adsorbed water molecules on the lunar surface. The area of significant pumping is estimated to be 96,000 km2 poleward of 80°S. In summary, a new processing technique has been developed that exploits information about the time variability of lunar surface temperatures measured by Diviner, and it results in new maps for the geographic distribution of potential water-ice deposits in the south polar region of the Moon.
Effect of Oxygen in the Structure, Microstructure and Mechanical Properties of Ti-xNi (x = 5, 10, 15 and 20 wt%) Alloys

Titanium alloys have great potential for use as biomaterials due to good biocompatibility and mechanical properties. The nickel addition to titanium improves the wear, corrosion and mechanical resistance of this element. The objective of this paper was to investigate the effects of oxygen on the structure, microstructure and some selected mechanical properties of this alloy system. The results showed that the samples present the adequate nickel concentration and low concentration of other metals. The alloys exhibit predominantly the α and intermetallic Ti2Ni phases, and the amount of it increases according to the nickel concentration. In the Ti-15Ni and Ti-20Ni alloys, this intermetallic reacted with oxygen forming Ti4Ni2O trioxide. The microstructures varied according to the processing, as well as the microhardness values. Elastic modulus values are slightly above titanium due to the formation of a new intermetallic phase but have not varied significantly with processing and doping with oxygen.
Biomass to fuel gas conversion through a low pyrolysis temperature induced by gamma radiation: an experimental and simulative study

Currently, 80% of global energy is supplied by carbon-based fossil fuels, which has led to concerns over the environmental impact of increasing atmospheric CO2 levels and has sparked ever-growing interest in renewable energy sources. The aim of this study is in line with adding value to low or negative valued biomass feedstocks by converting them into marketable bio-fuel gases, to replace the current one, as a renewable resource for energy via the pyrolysis technology. As a promising thermal conversion method in terms of high reliability, good flexibility through processing and production of versatile range of products pyrolysis is considered to be an important process for the generation of sustainable energy and chemicals from biomass. The pyrolysis process converts biomass carbon-containing materials into a combustible gas, which is primarily composed of carbon monoxide, hydrogen, and methane. However, the literature available over the last few decades have reported that the pyrolysis process should be carried out at elevated temperatures, which is at least 500 °C. The current study is focused on the conversion of some biomass into certain fuel gases at low operational temperatures assisted by γ radiation. First, using raw untreated biomass, gas mixtures composed of different percentages of carbon dioxide and methane were obtained under different operating conditions of time and temperature. In practical, the maximum temperature and time of 300 °C and four hours, respectively, were applied through this conversion process. A complete shift in the produced gas composition towards pure methane (natural gas) was obtained under the same operating conditions via the introduction of gamma ray-treated biomass samples in the pyrolysis system. On the other hand, nano-carbon black particles were obtained as the by-product of the thermal conversion of the irradiated biomass, whereas amorphous structured carbon was obtained when untreated biomass was applied. The gas composition analysis was conducted using a GC instrument equipped with a TC detector and carbon particle characterization was carried out using both HR TEM and Raman spectroscopy.
Improving HEVC Coding Efficiency Using Virtual Long-Term Reference Pictures

Inter-frame prediction in HEVC uses two types of reference pictures: short-term and long-term. Out of these, long-term reference (LTR) pictures enable exploiting correlation among frames with extended temporal distances. In addition, LTR pictures improve the inter-frame prediction where video scenes are repeated such as in TV-series episodes, news broadcasts and movies. In this context, this paper proposes an algorithm to calculate LTR pictures using artificially generated virtual reference frames for static-camera scenes. The experimental results demonstrate an average coding improvement of 2.34% in terms of Bjøntegaard Delta Bit Rate(BDBR), when compared with the HEVC reference encoder HM16.8.
Research on Hierarchical Control Strategy of AC/DC Hybrid Microgrid Based on Power Coordination Control

The AC/DC hybrid microgrid has a large-scale and complex control process. It is of great significance and value to design a reasonable power coordination control strategy to maintain the power balance of the system. Based on hierarchical control, this paper designs a reasonable power coordination control strategy for AC/DC hybrid microgrid. For lower control, this paper designs a variety of control modes for each converter in different application scenarios. For the higher control, this paper analyzes the working mode of the system and designs the power coordination control strategy under the grid-connected and isolated island mode. In grid-connected operation, the DC bus voltage can be stabilized by adjusting the operation mode of the DC energy storage and the on-off of the secondary load. In isolated island operation, the DC sub-microgrid is the main microgrid, and the DC energy storage is the main power regulating equipment. This is based on the principle of “energy is in short supply in the system, DC energy storage finally discharge, energy supply exceeds demand in the system, DC energy storage gives priority to charging” of DC energy storage. By adjusting the control strategy of the micro-source, the reference power, and the on-off of the secondary load, the overall power balance is maintained. The Matlab/Simulink simulation software was used to build the AC/DC hybrid microgrid simulation model, which verified the effectiveness and stability of the proposed power coordination control strategy under various operating conditions.
Isolation and characterization of chalcone synthase (CHS) gene from Phalaenopsis and Doritaenopsis orchids

Abstract. Sukma D, Handini AS, Sudarsono. 2020. Isolation and characterization of chalcone synthase (CHS) gene from Phalaenopsis and Doritaenopsis orchids. Biodiversitas 21: 5054-5064. Chalcone synthase (CHS) is a key enzyme in flavonoid biosynthesis. The research aims to isolate and characterize the CHS gene nucleotide sequence diversity of nine Phalaenopsis and one Doritaenopsis genotypes. Genomic DNA was isolated from young leaves and used to PCR amplify the gene using CHS specific degenerate primers. Results of PCR amplification yielded DNA fragments of 700 bp. Upon sequencing and nucleotide sequence analysis, we found that the genomic fragments were partial CHS gene from Phalaenopsis and Doritaenopsis genotypes and deposited the sequences in the NCBI Genebank Database accession numbers of KR184089-KR184098. More analysis of the sequences confirmed they shared ranged from 81-99% sequence identities to known CHS genes from Phalaenopsis deposited in the NCBI Database. They also shared 84-100% amino acid residues identity to CHS polypeptides. Multiple sequence alignment (MSA) and phylogenetic analysis further revealed the determined CHS nucleotide sequences from Phalaenopsis and Doritaenopsis genotypes were closely related to CHS genes from other orchid species.
Water‐flooding and consolidation of reservoir chalk – effect on porosity and Biot's coefficient

Improved oil recovery from chalk reservoirs by water‐flooding may cause mechanical weakening and change in elasticity. Confined compressive strength testing of chalk from a North Sea reservoir was done in water‐saturated and oil‐saturated conditions. During testing, elastic wave velocities were sampled by ultrasonic transducers, so that subsequently Biot's coefficient could be modelled. The porosity declined via an ‘elastic phase’, a ‘transitional phase’, an ‘elastoplastic phase’ and a ‘strain hardening phase’, but Biot's coefficient indicates that these terms may be partly misleading. In the ‘elastic phase’, porosity and Biot's coefficient decrease, indicating elastoplastic deformation. In the ‘transitional phase’, Biot's coefficient increases as a reflection of breaking contact cement (pore collapse), whereas Biot's coefficient remains stable in the ‘elastoplastic phase’, indicating elastic deformation on the virgin curve. Plastic deformation takes place during phases of creep, where both porosity and Biot's coefficient decrease. Similarly, in the ‘strain hardening phase’, both porosity and Biot's coefficient decrease as a reflection of elastoplastic deformation. For chalk with 45%–47% porosity, the ‘transitional phase’ begins at 8 MPa axial stress when water‐saturated and at 12 MPa when oil‐saturated. For chalk with 41%–43% porosity, the corresponding stresses are 16 and 20 MPa. For chalk with 32%–36% porosity, the corresponding stresses are 23 and 31 MPa. Chalk samples with irreducible water saturation and movable oil were water‐flooded. They yield at stresses close to corresponding oil‐saturated samples, but after flooding show compaction trends not significantly different from the water‐saturated samples. Water‐flooding promotes pore collapse as reflected in an increasing Biot's coefficient. The consequent softening effect on acoustic impedance is small as compared with the effect of increasing fluid density. With respect to 4D seismic, water‐flooding causes distinctly higher acoustic impedance and Poisson's ratio irrespective of compaction.