Miracle-dz/UniFAR-FTUs huggingface dataset:
Effects of Superplasticizer on the Hydration, Consistency, and Strength Development of Cemented Paste Backfill

The strength and consistency of cemented paste backfill (CPB) are of key concerns in the stope stability and cost control for underground mines. It is common practice to use additives, such as superplasticizer, to improve the performance of CPB. This study mainly focuses on the effects of superplasticizer on the hydration, consistency, and strength of CPB. In this study, a polynaphtalene sulfonate was used as the superplasticizer. The binder is a mix of 33.3% ordinary Portland cement and 66.7% fly ash. The CPB specimens with a tailings-binder ratio of 3:1 and a solid concentration of 70% were then tested by a low field nuclear magnetic resonance system after different hydration times. Effects of polynaphtalene sulfonate on the hydration, fluidity, and strength were investigated. Results showed that the polynaphtalene sulfonate has a strong influence on short-duration hydration, which may contribute to the strength increase of CPB. It has been demonstrated that the polynaphtalene sulfonate improved the fluidity of the CPB mixture. With the increased dosage of polynaphtalene sulfonate, the slump increased. It was also found that the polynaphtalene sulfonate dosage has a negligible effect on the 1 day (d) strength while it has a strengthening effect on the 7 d, 14 d, and 28 d strength of CPB specimens.
Wildfire smoke, Arctic haze, and aerosol effects on mixed-phase and cirrus clouds over the North Pole region during MOSAiC: an introduction

Abstract. An advanced multiwavelength polarization Raman lidar was operated aboard the icebreaker Polarstern during the MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) expedition to continuously monitor aerosol and cloud layers in the central Arctic up to 30 km height. The expedition lasted from September 2019 to October 2020 and measurements were mostly taken between 85 and 88.5∘ N. The lidar was integrated into a complex remote-sensing infrastructure aboard the Polarstern. In this article, novel lidar techniques, innovative concepts to study aerosol–cloud interaction in the Arctic, and unique MOSAiC findings will be presented. The highlight of the lidar measurements was the detection of a 10 km deep wildfire smoke layer over the North Pole region between 7–8 km and 17–18 km height with an aerosol optical thickness (AOT) at 532 nm of around 0.1 (in October–November 2019) and 0.05 from December to March. The dual-wavelength Raman lidar technique allowed us to unambiguously identify smoke as the dominating aerosol type in the aerosol layer in the upper troposphere and lower stratosphere (UTLS). An additional contribution to the 532 nm AOT by volcanic sulfate aerosol (Raikoke eruption) was estimated to always be lower than 15 %. The optical and microphysical properties of the UTLS smoke layer are presented in an accompanying paper (Ohneiser et al., 2021). This smoke event offered the unique opportunity to study the influence of organic aerosol particles (serving as ice-nucleating particles, INPs) on cirrus formation in the upper troposphere. An example of a closure study is presented to explain our concept of investigating aerosol–cloud interaction in this field. The smoke particles were obviously able to control the evolution of the cirrus system and caused low ice crystal number concentration. After the discussion of two typical Arctic haze events, we present a case study of the evolution of a long-lasting mixed-phase cloud layer embedded in Arctic haze in the free troposphere. The recently introduced dual-field-of-view polarization lidar technique was applied, for the first time, to mixed-phase cloud observations in order to determine the microphysical properties of the water droplets. The mixed-phase cloud closure experiment (based on combined lidar and radar observations) indicated that the observed aerosol levels controlled the number concentrations of nucleated droplets and ice crystals.
Segments of cognitive responses towards local food safety concerns amongst international students in Ghana

Despite the attention paid to food safety research, few empirical works have used a non-reductionist perspective to understand how international consumers cognitively respond to local food safety conditions. Using the tri-component theorisation and the two-step clustering approach with the Kruskal Wallis test on a sample of 109 international students in Ghana, this study provides a non-reductionist cognitive segment of international students towards local food safety conditions in Ghana. The findings revealed that there are three cognitive segments of international consumers towards local food safety conditions, namely self-regards, pessimists, and epicureans. Self-assureds respond to their own self-cognition towards local food safety concerns but deny the cognition of others, moderately respond affectively and sometimes avoid local foods. Pessimists have a highly sensitive cognitive response towards local food safety conditions, high affective responses and avoid the consumption of local foods as a result, while epicureans do not cognitively respond to local food safety conditions, have low affective reactions and consume local foods regardless of the food safety conditions. The implications of these findings in the context of local food preparation, packaging, and handling as well as food safety regulations and marketing are discussed
A multiple regression model for prediction of optimal dose of Moringa Oleifera in faecal sludge dewatering

Moringa Oleifera (MO) is a highly effective conditioner in the dewatering of Fecal sludge (FS). However, the model for the prediction of its optimal dose has not yet been documented. This article presents the results of the developed model for the prediction of MO optimal doses. The developed model was based on assessing the FS parameters and MO stock solution. The FS samples were obtained from a mixture of a pit latrine and septic tank and were analyzed at the water quality laboratory of the University of Dar es Salaam. The multiple linear regression model was used to establish a relationship between MO optimal dose as a function of FS characteristics (pH, Electrical Conductivity, Total Solids and Total Suspended Solids) and concentration of MO stock solution. The results indicated that the main contributing factors which determine the MO optimal dose were the concentration of MO stock solution, followed by pH of FS. The model results showed a good agreement between the predicted and observed MO optimal dose with a coefficient of determination of R2 = 0.72 and 0.9 for calibration and validation respectively. Therefore, the model can be adapted to determine the MO optimal dose without running the Jar-test experiment.
Chemical vapour deposition of chromium-doped tungsten disulphide thin films on glass and steel substrates from molecular precursors

Polycrystalline thin films of chromium doped tungsten disulphide (WS2) have been deposited onto glass and steel substrates by Aerosol-Assisted Chemical Vapour Deposition (AACVD) using bis(diethyldithiocarbamato)disulfidothioxo tungsten(VI) (WS3L2) and tris(diethyldithiocarbamato) chromium(III) [Cr(S2CNEt2)3] (CrL3) complexes as precursors in different molar ratios at 450 °C. The deposited films were characterised by p-XRD, SEM, and EDX and Raman spectroscopies. Chromium doping of up to 15 mol% was achieved in WS2 thin films.
Perceived organisational justice and unethical work behaviour among hotel employees in Accra: the role of gender and marital status

Ethics and organizational justice share common roots and patterns of development in that, employees’ ethical behaviours are influenced by the perceived fairness of the company’s policies, procedures and decision making. While this link has been established in many studies, whether this relationship is the same for different demographic groups has received little attention, particularly for the hospitality industry. This study, therefore, sought to examine perceived organisational justice and unethical work behaviours among hotel employees in Accra using gender and marital status as moderating variables. Data was collected from a sample of 379 employees of five four-star hotels in Accra. The moderated multiple regression technique, PROCESS by Hayes in SPSS was employed to test the significance of the moderating variables in the relationship between organisational justice and unethical work behaviour among hotel employees in Accra. The results showed that gender was significant in interactive justice effect on unethical work behaviours; while marital status was significant in distributive justice and procedural justice’ effect on unethical work behaviours among the hotel employees. The study recommends specific strategies for discouraging unethical workplace behaviours and encouraging organisational citizenship.
Test and Numerical Analysis on Damaged Steel Beam Strengthened with Prestressed CFRP Sheet

This paper presents the experimental and numerical analysis of damaged steel beams strengthened with prestressed CFRP sheet or only strengthened with CFRP sheet. The test results showed that damaged level had a significant effect on the stiffness, yield load, and ultimate bearing capacity. And using prestressing CFRP sheet to strengthen damaged steel beam could increase the ultimate bearing capacity. The numerical analysis results showed that the damaged level had a significant effect on the stiffness and ultimate bearing capacity. The strengthened steel beam with the damaged level could exceed the steel beam without damage by about 10% in the ultimate bearing capacity. The ultimate bearing capacity would increase about 8% when the flange or web thickness increased per 1 mm. The ultimate bearing capacity would increase about 3% when the thickness or width of CFRP sheet increased per 0.05 mm or 10 mm. The bearing capacity would increase about 1.5% when the prestressed degree increased about 7%.
Numerical Simulation of the Performance of Applying Different Nanofluids in a Tube with a 90° Bend at the Center of the Tube

This research manuscript addresses the study of the performance of a flat tube having a 90° bend under the flow of three different nanofluids such as copper oxide, multiwalled carbon nanotubes, and aluminum oxide/water nanofluids at different inlet fluid temperatures and Reynolds numbers. The performance of the flat tube is analyzed under the Reynolds number between 5000 and 11000 and a fluid inlet temperature range of 35°C–50°C. The results obtained in this study show that the heat transfer coefficient increases with the increase in volume concentration as well as Reynolds number. The maximum heat transfer coefficient is obtained using multiwalled carbon nanotubes followed by copper oxide and then aluminum oxide. This study also illustrates that the friction factor increases with the increase in volume concentration and decrease in Reynolds number. The results of the numerical study have been validated with the help of an experimental study. The study has proved that the use of nanofluids instead of the conventional fluid can lead to reducing the size of the tube for the same amount of heat transfer which can prove the reduction of the size in heat transfer equipment. Furthermore, it is also observed in this study that the presence of the 90° bend in the flat tube improved the heat transfer performance due to the increased turbulence at the bent section of the tube.
Leaf-cutting ant (Atta laevigata Smith) in an African mahogany plantation in Minas Gerais state, Brazil

Khaya grandifoliola C. DC. (Meliaceae), known as African mahogany, is used in the establishment of commercial plantations for high-value timber production. This work aims to report the first occurrence of the genus Atta in a commercial plantation of this species. An ant nest mound with 105 m2 of loose soil and five active ant holes were observed. Leaves cut into crescent shaped sections and pieces of young branches were found near these holes, in addition to trees with the apical part of their crown partially defoliated. The collected specimens were identified as Atta laevigata Smith (Hymenoptera: Formicidae: Attini), locally known as the glass-head leaf-cutting ant.
Morphological status of multipolar neurons in the lateral cortical area of the telencephalon of a catfish, Clarias batrachus: A Golgi study

The present study explored the morphological features of multipolar neurons in the lateral cortical area of the telencephalon of a catfish, Clarias batrachus, employing Golgi staining. In C. batrachus, the multipolar neurons have round to multiangular soma with axon emerged adjacent to either basal or apical dendrites. Branched apical and basal dendrites are of various thicknesses with few dendritic spines on them. Multipolar neurons have shown uniform distribution in both the center and toward the boundary of the lateral cortical area. The morphological features and position suggest that the role of this neuronal type in maintaining the local circuit as well as in transmitting information acting as projection neurons to the adjacent telencephalic region.
A Comparative Study of Four Total Variational Regularization Reconstruction Algorithms for Sparse-View Photoacoustic Imaging

Photoacoustic imaging (PAI) is a new nonionizing, noninvasive biomedical imaging technology that has been employed to reconstruct the light absorption characteristics of biological tissues. The latest developments in compressed sensing (CS) technology have shown that it is possible to accurately reconstruct PAI images from sparse data, which can greatly reduce scanning time. This study focuses on the comparative analysis of different CS-based total variation regularization reconstruction algorithms, aimed at finding a method suitable for PAI image reconstruction. The performance of four total variation regularization algorithms is evaluated through the reconstruction experiment of sparse numerical simulation signal and agar phantom signal data. The evaluation parameters include the signal-to-noise ratio and normalized mean absolute error of the PAI image and the CPU time. The comparative results demonstrate that the TVAL3 algorithm can well balance the quality and efficiency of the reconstruction. The results of this study can provide some useful guidance for the development of the PAI sparse reconstruction algorithm.
Adenylyl Cyclase and Protein Kinase A Play Redundant and Distinct Roles in Growth, Differentiation, Antifungal Drug Resistance, and Pathogenicity of <italic toggle='yes'>Candida auris</italic>

Candida auris is a globally emerging multidrug-resistant fungal pathogen. Its pathogenicity-related signaling networks are largely unknown. Here, we characterized the pathobiological functions of the cyclic AMP (cAMP)/protein kinase A (PKA) signaling pathway in C. auris. We focused on adenylyl cyclase (CYR1), the PKA regulatory subunit (BCY1), and the PKA catalytic subunits (TPK1 and TPK2). We concluded that PKA acts both dependently and independently of Cyr1 in C. auris. Tpk1 and Tpk2 have major and minor roles, respectively, in PKA activity and functions. Both Cyr1 and PKA promote growth, thermotolerance, filamentous growth, and resistance to stress and antifungal drugs by regulating expression of multiple effector genes. In addition, Cyr1 and PKA subunits were involved in disinfectant resistance of C. auris. However, deletion of both TPK1 and TPK2 generally resulted in more severe defects than CYR1 deletion, indicating that Cyr1 and PKA play redundant and distinct roles. Notably, Tpk1 and Tpk2 have redundant but Cyr1-independent roles in haploid-to-diploid cell transition, which increases virulence of C. auris. However, Tpk1 and Tpk2 often play opposing roles in formation of biofilms and the cell wall components chitin and chitosan. Surprisingly, deletion of CYR1 or TPK1/TPK2, which resulted in severe in vitro growth defects at 37°C, did not attenuate virulence, and BCY1 deletion reduced virulence of C. auris in a systemic murine infection model. In conclusion, this study provides comprehensive insights into the role of the cAMP/PKA pathway in drug resistance and pathogenicity of C. auris and suggests a potential therapeutic option for treatment of C. auris-mediated candidemia. IMPORTANCE Despite the recently growing concern of pan-resistant Candida auris infection, the pathogenicity of this ascomycetous fungal pathogen and the signaling circuitries governing its resistance to antifungal drugs are largely unknown. Therefore, we analyzed the pathobiological functions of cyclic AMP (cAMP)/protein kinase A (PKA) signaling pathway in C. auris, which plays conserved roles in the growth and virulence of fungal pathogens. We show that adenylyl cyclase Cyr1 and PKA have pleiotropic roles in growth, morphogenesis, stress responses, antifungal drug and disinfectant resistance, and ploidy shifts of C. auris. Notably, however, we observed that the tpk1D tpk2D mutant generally exhibited more disrupted phenotypes than the cyr1D mutant, and we suggest Tpk1 and Tpk2 have both cAMP-dependent and -independent roles in this pathogen. Most surprisingly, we observed that hyperactivation, not inhibition, of the cAMP/PKA pathway reduced virulence of C. auris. Based on our results, we suggest and discuss potential therapeutic strategies for candidiasis caused by C. auris.
Development of a Knowledge Discovery System in Big Data Mining Environment

- This paper focused on the development of knowledge discovery system in big data mining environment. In order to carry out the aim of the work, the paper developed a knowledge discovery system in Big Data Mining Environment that could sift through large amounts of data to find previously hidden patterns, discover valuable new insights and make decisions; apply the dynamics involved in big data technologies and use of distributed data storage and analysis architecture of Hadoop MapReduce; conduct performance benchmarking on Relational Database Management System (RDBMS) and Hadoop cluster, create value in several ways and improve performances. The analytic environment provided a powerful in database algorithms and open source algorithms to enable predictive analytics, data mining, statistical analysis, advanced numerical computations and interactive graphics. Automated analysis of historical data were performed by employing Knowledge Discovery and Data mining (KDD) using Map Reduce Methodology and Predictive Analytic Methodology. The Euclidean distance and the pseudo F-statistic validated Hadoop’s high scalability and performance in the real time applications domain, minimized data movement thereby ensuring inherent security and better performance. The result showed that a model for big data mining environment was realized which provided an open source framework for cloud computing and distributed file system for fast data loading.
CORRELATIONS OF TELERADIOGRAPHIC PARAMETERS OF TEETH LOCATION DETERMINED BY THE METHODS OF BJORK, JARABAK AND SASSOUNI WITH THE PARAMETERS OF THE UPPER AND LOWER JAWS IN YOUNG MEN AND YOUNG WOMEN WITH ORTHOGNATHIC OCCLUSION

Annotation. Determining the characteristics of certain indicators within a certain population, the relationship between certain anatomical structures and parameters of the human body is one of the key tasks of clinical anthropology. Identifying the nature, strength and direction of the interdependencies of such indicators is a key element not only for understanding human nature but also for solving clinical, including dental problems today. The aim of the study was to establish in Ukrainian young men and young women with orthognathic occlusion the peculiarities of correlations of teleradiographic parameters of tooth location determined by Bjork, Jarabak and Sassouni methods with parameters of upper and lower jaws and tooth location. Teleradiography in the mode of cephalometric examination was performed for 49 young men and 76 young women with orthognathic occlusion. Cephalometric analysis was performed using OnyxCeph3TM software, 3DPro version, Image Instruments GmbH, Germany (software license URSQ-1799). Correlation assessment was performed in the license package "Statistica 6.0" using the non-parametric Spearman method. In young men and young women, the features of multiple correlations of teleradiographic parameters of the upper and lower jaws with the parameters of the location of the teeth determined by the methods of CFT-Bjork, Roth-Jarabak and Sassouni. As a result of quantitative analysis of significant correlations between teleradiographic parameters of the upper and lower jaws with the parameters of the location of the teeth found: CFT-Bjork in young men 46.9 %, of which 5.4 % straight strong, 18.5 % straight medium and 2.3 % straight weak and 2.3 % reversible strong, 16.2 % reversible medium strength and 2.3 % reverse weak, and young women 38.5 %, of which, 2.3 % direct strong, 15.4 % direct medium strength and 6.2 % direct weak and 0.8 % reverse strong, 7.7 % reverse medium strength and 6.2 % of reversible weak; according to the Roth-Jarabak method, 36.2 % of young men, 6.6 % of direct strong, 11.8 % of direct medium strength and 2.6 % of direct weak and 2.6 % of reverse strong, 11.8 % of reverse of medium strength and 0.7 % of reverse weak, and young women 44.7 %, of which, 3.9 % direct strong, 15.1 % direct medium strength and 7.2 % direct weak and 0.7 % reverse strong, 8.6 % reverse medium strength and 9.2 % reverse weak; according to the Sassouni method, 42.8 % of young men have all medium-strength, and 42.8 % of young women have, of which 35.7 % have medium-strength and 7.1 % have weak straight. Manifestations of sexual dimorphism of the received correlations are established only between the indicators defined by CFT-Bjork and Roth-Jarabak methods.
HR-LC-MS based profiling of phytochemicals from methanol extracts of leaves and bark of Myristica dactyloides Gaertn. from Western Ghats of Karnataka, India

Kuppuru Mallikarjunaiah Marulasiddaswamy1, Bettadapura Rameshgowda Nuthan2,3, Channarayapatna-Ramesh Sunilkumar3, Shrisha Naik Bajpe3,4, Kigga Kaadappa Sampath Kumara5, Shailasree Sekhar6, Kukkundoor Ramachandra Kini1* 1Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysuru, India. 2Department of Studies in Microbiology, University of Mysore, Manasagangotri, Mysuru, India. 3Global Association of Scientific Young Minds, Mysore, India. 4Department of Studies in Biotechnology, Shri Dharmasthala Manjunatheshwara College (Autonomous) Ujire, Mangalore, Karnataka, India. 5Government Pre-University College, Davangere, Karnataka, India. 6Institution of Excellence (IOE), Vijnana Bhavana, University of Mysore, Mysuru, India.