Miracle-dz/UniFAR-FTUs huggingface dataset:
Factors Affecting Quality of the Online Delivery Service among Undergraduate Students

Article History: Received: 10 November 2020; Revised: 12 January 2021; Accepted: 27January 2021; Published online: 05April 2021 Abstract:The quality of service derived from online delivery service is very paramount to customers and the service providers since there is now a drastic shift by people to buy and sell via the old-style to doing businessonline and as such, quality of service delivery among other factors should be the hall mark. The aim of this paper is to investigate the factors affecting the quality of online delivery service among the students of University Malaysia Kelantan (UMK). The probability sampling technique with emphasis on simple random sampling technique was used in this study wheredata was obtained using questionnaire and analyzed using the Statistical Package for Social Science (SPSS) software from 385 respondents from UMK, City Campus. A pilot test on the validity of the questionnaire was conducted and the reliability test results show that all the variables are above 0.7 Cronbach’s Alpha value an indication of acceptability.The analytical results show that service speed, service price, information quality and perceived risk has positive affect on the online shoppers’ perception towards delivery service quality of online shopping. While, Pearson correlation revealed that service speed and information quality obtained the value under the high positive correlation; service price and perceived risk under negligible correlation. In testing the hypotheses of the study, itindicates that service speed and information quality hypotheses have strong relationship with the dependent variable while service price and perceived risk hypotheses had very low relationship with the dependent variable. This study was therefore based on the SERVQUAL model to determine customers perception on online shopping context. The study recommends that different methodologies can be used by future researchersby conducting interview, or broadening the scope of the study in order to find out the exact perception of customers like students on online shopping towards delivery service quality of online shopping.Therefore, the result of this study can be used as a reference by the practitioners or the online stores, enrich the body of knowledge as well as form basis for future researchers that are interested in this field.
Assessing values within collaborative interventions for families with parental substance use and child welfare involvement

ABSTRACT Effective intervention for families with parental substance use disorders (SUD) and child maltreatment requires multiple agencies to collaborate on system changes to deliver family-centered services. The Collaborative Values Inventory (CVI) was designed for use in multi-system interventions to facilitate understanding of differences in beliefs among professionals. This study reports on significant revisions to the CVI and the psychometrics of the CVI_2. The primary aim was to develop CVI measures suitable for research by identifying a subset of CVI_2 items with adequate factor loadings, sensitivity to interagency differences, and strong overall reliability. The Outcomes CVI includes 24-items that met the inclusion criteria and subsequently showed a strong factor structure and strong unidimensional reliability. Suggestions for research on values and beliefs for family-centered initiatives are included.
Experimental investigation on the airside heat transfer and pressure drop of the fin-and-tube heat exchangers having oval tubes

ABSTRACT It is well known that the replacement of round tubes to oval tubes in a fin-and-tube heat exchanger reduces the air-side pressure drop as well as the low-performance region behind the tube, which improves the thermal performance of the heat exchanger. However, experimental evidences are lacking, especially for generic heat exchangers. In this study, generic heat exchangers having oval tubes were tested, which included two different oval tube dimension and two different tube pitches. Round tube samples were also tested for a comparison purpose. The effect of fin pitch on j factor was negligible, whereas f factor increased as the fin pitch increased. Furthermore, both the j and f factor decreased as the number of tube row increased. A thermal performance comparison based on the ratio of thermal conductance per unit volume ( ) to pressure drop per unit length ( ) revealed that the oval tube samples yielded a higher performance than the round tube samples, except at a small number of tube row. Furthermore, the best performance was obtained from the oval tube samples having a smaller diameter tube. On the other hand, relatively poor performance was obtained from the oval tube samples having a larger diameter tube, probably due to the large pressure drops. The j and f correlations were developed based on the data.
Investigation of Ruminant Encephalitic and Septicemic Listeriosis by the Immunofluorescence Method

Listeria genus is Gram-positive facultative intracellular bacteria that are found in the soil as saprophytes but also contain species that have pathogenic effects in their last host. Listeria monocytogenes is the major pathogen in Listeria species that is responsible for the majority of Listeriosis cases in humans and animals. In this study, it was aimed to investigate L. monocytogenes with histopathological and immunofluorescence (IF) methods in brain and liver tissues taken from sheep and cattle with clinical signs of suspicious Listeriosis. In the study, isolation and identification of L. monocytogenes with cultural methods were also applied. The material of the study consisted of tissue samples from 16 sheep and 2 cattle. As a result of cultural analysis, L. monocytogenes was identified from 12 (66.6%) of cases. Within the framework of histopathological and macroscopic findings, 16 (88.8%) of 18 cases with suspected Listeriosis were positive with the immunofluorescence method. These findings reveal that the immunofluorescent staining method is a reliable and sensitive method in the diagnosis of Listeriosis.
Conceptualization of switching costs in fitness centers: a higher-order reflective-formative model

ABSTRACT HIGHLIGHTS We identify switching costs dimensions associated with fitness centres. We propose a higher-order reflective-formative fitness switching costs model. We provide conceptual definitions of switching costs. The concept of switching costs has been given increasing attention in the marketing and management literature. However, conceptual confusion in the literature has impeded applying the concept of switching costs to fitness centres. As such, the purpose of the study is to conceptualize switching costs in the context of fitness centres. Four sequential steps are employed to achieve the objective of the study. In Step 1, a qualitative method using open-ended questions (n = 98) identifies switching costs dimensions in fitness centres. The results show 11 multidimensional constructs, which are then conceptualized as a third-order fitness switching costs model (FSCM) in Step 2. In Step 3, the higher-order FSCM is specified as a third-order formative construct consisting of four second-order formative constructs with 11 first-order reflective constructs. Building on the three step s, Step 4 proposes a formal definition of switching costs as consumers’ perceptions of procedural, relationship, financial, and convenience costs when voluntarily considering switching to another fitness centre. Definitions for all lower-order dimensions are also proposed. The theoretically grounded conceptualization of switching costs in the present study enhances conceptual clarity and builds a foundation for further investigations in this area.
Water-Accelerated Allylsilylation of Alkenes Using a Proton-Exchanged Montmorillonite Catalyst

The addition of a small amount of water induced a dramatic accelerating effect on allylsilylation catalyzed by H+-exchanged montmorillonite, enhancing the catalytic activity by greater than 60-fold. The allylsilylation of aromatic and aliphatic alkenes was completed within 15–60 min at 40 °C. It is possible that the active disilyl cation intermediate is stabilized by water molecules on the montmorillonite surface.
Can Social Media Predict Soccer Clubs’ Stock Prices? The Case of Turkish Teams and Twitter

Finance literature in sports focuses on three main methods of stock price prediction in soccer: based on match results, pre-match expectations, or match importance. For pre-match expectations, betting odds is commonly used as the indicator of investors’ sentiments. We propose to include Twitter data as another indicator of this variable, and analyze the links among soccer match results, sentiments, and stock returns of the four major Turkish soccer teams. Our results show that social media can be a strong indicator of pre-match expectations and investors’ sentiments in stock price prediction.
Design and Analysis of Two-Switch-Based Enhanced Gain Buck–Boost Converters

This article presents evolution of two-switch-based enhanced gain buck–boost converter (EGBBC) topologies. All these topologies exhibit quadratic buck–boost voltage transformation ratio together with common ground feature. The basis for these topological evolutions is the cascading of boost followed by restructured ZETA. Direct cascading of boost with ZETA yields a pseudo quadratic conversion ratio and an additional buck stage is mandatory to transform the gain to quadratic buck–boost form. Without adding additional stages and to yet realize the quadratic buck–boost transformation, a modified boost configuration at the front-end together with restructured cascading approach is adopted in the topological evolution. This evolution resulted in three different topologies exhibiting quadratic buck–boost voltage gain named as EGBBC Type-1, Type-2, and Type-3. Exhaustive steady-state and dynamic analysis is presented for Type-1, while brief formulations are listed for Type-2 and 3. Also, a comprehensive review of the reported buck–boost converters is made and compared with EGBBC features. A 10 ∼ 37 W, 15 to 10 V for bucking operation, and 75 V for boosting operation prototype is built for concept validation. A simple two-pole two-zero compensator is adopted for load voltage regulation. Measurement results demonstrate closed-loop system stability, robustness, and voltage regulation both in bucking as well as in boosting operation.
“What’s Up with the Weather?” Public Engagement with Extreme Event Attribution in the United Kingdom

The science of extreme event attribution (EEA)—which connects specific extreme weather events with anthropogenic climate change—could prove useful for engaging the public about climate change. However, there is limited empirical research examining EEA as a climate change communication tool. To help fill this gap, we conducted focus groups with members of the U.K. public to explore benefits and challenges of utilizing EEA results in climate change advocacy messages. Testing a range of verbal and visual approaches for communicating EEA, we found that EEA shows significant promise for climate change communication because of its ability to connect novel, attention-grabbing, and event-specific scientific information to personal experiences and observations of extreme events. Communication challenges include adequately capturing nuances around extreme weather risks, vulnerability, adaptation, and disaster risk reduction; expressing scientific uncertainty without undermining accessibility of key findings; and difficulties interpreting mathematical aspects of EEA results. On the basis of our findings, we provide recommendations to help address these challenges when communicating EEA results beyond the climate science community. We conclude that EEA can help catalyze important dialogues about the links between extreme weather and human-driven climate change.
HCHODetector: Formaldehyde concentration detection based on deep learning

Currently, deep learning technology is developing rapidly. Deep learning is mainly used in the fields of vision and hearing for human beings, but less in the field of olfactory. Formaldehyde is a common gas harmful to human health. However, the traditional methods of Formaldehyde concentration detection are inefficient in some cases. As for this problem, this paper proposes a novel formaldehyde detector namely HCHODetector. Specifically, this detector is based on deep learning and HSV colour space augmentation. Moreover, we propose a novel Mask-guided module and a novel pre-training network to enhance the colour discrimination ability of HCHODetector. As a consequence, the experimental results show that the detection error is within 0.08 mg/m3 in the actual environment, which provides a new idea for Formaldehyde concentration detection.
The miR-193a-5p/NCX2/AKT axis promotes invasion and metastasis of osteosarcoma

MiR-193a-5p has been observed to have oncogenic or tumor suppressive functions in different kinds of cancers, but its role and molecular mechanism in osteosarcoma are elusive. Na+/Ca2+ exchangers (NCX1, NCX2 and NCX3) normally extrude Ca2+ from the cell, and deregulation of the intracellular Ca2+ homeostasis is related to several kinds of diseases, including cancer. The present study demonstrated that miR-193a-5p was upregulated in osteosarcoma tissues compared with the corresponding adjacent noncancerous tissues, and promoted colony formation, migration, invasion and epithelial-mesenchymal transition (EMT) in osteosarcoma cells (SaOS-2 and U-2OS), as well as metastasis in a murine xenograft model. Tandem mass tag-based quantitative proteomics analysis identified NCX2 as a potential target of miR-193a-5p. Luciferase activity assays and Western blotting further confirmed that miR-193a-5p recognized the 3′-untranslated region of NCX2 mRNA, and negatively regulated NCX2 expression. NCX2 was downregulated in osteosarcoma tissues, and its expression was negatively correlated with miR-193a-5p levels. Ectopic expression of NCX2 in osteosarcoma cells could reverse the oncogenicity of miR-193a-5p, indicating that miR-193a-5p exerted its effects by targeting NCX2. Further study demonstrated that NCX2 suppresses Ca2+-dependent Akt phosphorylation by decreasing intracellular Ca2+ concentration, and then inhibited EMT process. Treatment with the antagomir against miR-193a-5p sensitized osteosarcoma to the Akt inhibitor afuresertib in a murine xenograft model. In conclusion, a miR-193a-5p/NCX2/AKT signaling axis contributes to the progression of osteosarcoma, which may provide a new therapeutic target for osteosarcoma treatment.
Development of the Short Scale of the Multidimensional Emotional Competence Questionnaire in a German Sample

The aim of this study is the development of a short self-report tool of the Multidimensional Emotional Competence Questionnaire (MECQ). The MECQ consists of 109 items representing 11 factors resulting in an ineffective usability in combination with other measurement instruments and constitutes the reason for this study. Based on the selection criteria at content and statistical level, the results of the analyses of 777 participants suggest the creation of a 32-item short version (MECQ-s). Confirmatory factor analysis supports a four-dimensional structure, including 11 factors of emotional competence (EC). The internal consistency reliability coefficients ranged from α = . 75 to . 76. A comparison between the MECQ and the MECQ-s provides evidence of construct validity. The main difference between the MECQ-s and other existing self-report tools is its multidimensionality integrating several factors of EC. Researchers and practitioners can use it to measure, map and describe, or evaluate EC.
Modeling and verification of capacitive quenching in a single photon avalanche diode

We present modeling and analysis of carrier dynamics in a single-photon avalanche diode (SPAD) operated with a capacitive quenching (CQ) method. The CQ method is regarded as a conventional resistive quenching (RQ) with its quenching resistance infinite or an open circuit. The SPAD is modelled as a lumped circuit consisting of a voltage dependent charge generator representing an avalanching depletion region and a capacitance of the depletion region and parasitic components. The carrier dynamics inside the device is described by time-dependent bipolar continuity equations (BCE) derived from the carrier continuity equations. We solve the BCE numerically with a 0.1 ps time resolution and investigate numbers of carriers in each circuit element as functions of time and of excess bias voltage (|𝑉ex|). We find two important characteristics of the CQ method; (1) a single-photon triggered Geiger-mode pulse is guaranteed to be quenched in a stable state (2) a voltage drop of the internal bias of SPAD due to the charges stored on the capacitance is proportional to |𝑉ex| with the proportionality factor of two. The results, in turn, enables one to design a SPAD free from after-pulse and from overflow. Such a SPAD pixel is shown to be compatible with a conventional complementary metal-oxide semiconductor (CMOS) image sensor (CIS) with a four transistors configuration pixel circuit. Finally, effectiveness of the present methodology is demonstrated by the subrange synthesis (SRS) time-of-flight (ToF) ranging experiments using a 6 μm size 400 × 400 pixels SPAD-based CIS.
New bird remains from the early Eocene Nanjemoy Formation of Virginia (USA), including the first records of the Messelasturidae, Psittacopedidae, and Zygodactylidae from the Fisher/Sullivan site

ABSTRACT We report new avian remains from the early Eocene Nanjemoy Formation of the Fisher/Sullivan site in Virginia, USA. The fossil material includes the first records of the Messelasturidae, Psittacopedidae, and Zygodactylidae from the Nanjemoy Formation, with these taxa being widespread and fairly common in coeval North American and European sites. Psittacopedidae and Zygodactylidae are stem group representatives of the Passeriformes, and a tibiotarsus assigned to the Psittacopedidae is unusual in that it lacks a supratendinal bridge (this bridge is, however, also absent in the psittacopedid taxon Pumiliornis). We further report more material of the Charadriiformes and corroborate a previous tentative referral of a tarsometatarsus to the Parvicuculidae. It is noted that this latter bone is likewise very similar to the tarsometatarsus of the Fluvioviridavidae, which indicates close affinities between the two higher-level clades. Because of the comparatively small extent of the new avian material, it is remarkable that it includes a comparatively high number of fossils that represent previously unknown taxa. This supports the hypothesis that early Eocene avifaunas featured a high taxonomic diversity, but that higher-level clades showed low species richness. We hypothesise that this may indicate low rates of cladogenetic diversification in a rather homogenous paleoenvironment.
Leadership development process maturity: An Afrocentric versus Eurocentric perspective

Orientation: Organisations continuously find it a challenge to focus on the right areas that would result in successful and effective leadership development. This article reports on a comprehensive study to identify the leadership development process maturity areas fit for Southern Africa. Research purpose: This article aims to identify and report on Eurocentric and Afrocentric leadership development process maturity areas and assess how these are similar or different. Motivation for the study: This study was conducted to help enhance the understanding of which Eurocentric and Afrocentric leadership development areas, organisations, especially in Southern Africa, need to focus on in support of a mature leadership development process. Research approach: A qualitative, deductive approach was adopted, which included an extensive, in-depth literature review, followed by in-depth, semi-structured interviews with Southern African leadership development expert panel members. Main findings: A complementary, inclusive and comprehensive list of 125 leadership development process maturity areas was developed within the Southern African context, which could be used by leadership development practitioners as a guide to focus their resources and leadership development efforts. It also functions as a new foundation for future leadership development research. Practical implications: Southern African organisations should focus more on what works in this geographical context to ensure that focused leadership development interventions are implemented, resulting in a higher return on leadership development investment. Contribution and value-added: This article contributes to the leadership development body of knowledge, specifically relating to the maturity of this process within the Southern African context.
Performance Evaluation of rPPG Approaches with and without the Region-of-Interest Localization Step

Traditionally, the first step in physiological measurements based on remote photoplethysmography (rPPG) is localizing the region of interest (ROI) that contains a desired pulsatile information. Recently, approaches that do not require this step have been proposed. The purpose of this study was to evaluate the performance of selected approaches with and without ROI localization step in rPPG signal extraction. The Viola-Jones face detector and Kanade–Lucas–Tomasi tracker (VK) in combination with (a) a region-of-interest (ROI) cropping, (b) facial landmarks, (c) skin-color segmentation, and (d) skin detection based on maximization of mutual information and an approach without ROI localization step (Full Video Pulse (FVP)) were studied. Final rPPG signals were extracted using selected model-based and data-driven rPPG algorithms. The performance of the approaches was tested on three publicly available data sets offering compressed and uncompressed video recordings covering various scenarios. The success rates of pulse waveform signal extraction range from 88.37% (VK with skin-color segmentation) to 100% (FVP). In challenging scenarios (skin tone, lighting conditions, exercise), there were no statistically significant differences between the studied approaches in terms of SNR. The best overall performance in terms of RMSE was achieved by a combination of VK with ROI cropping and the model-based rPPG algorithm. Results indicate that the selection of the ROI localization approach does not significantly affect rPPG measurements if combined with a robust algorithm for rPPG signal extraction.
Investigation of the principal vectors of abortive diseases in one-humped camels (Camelus dromedarius)

Department of Natural and Life Sciences, Faculty of Sciences, University Yahia Fares of Medea, New University Pole, Medea, Institute of Veterinary Sciences, Laboratory LBRA, University SAAD Dahlab Blida 1, Road Soumaa, BP 270, Blida, Normal High School of Technological Education, University of Skikda, Skikda, Department of Veterinary Sciences, University of El Tarf, El Tarf, National High Veterinary School of Algiers, 16000, Algiers, Algeria
Anisotropy of Water Dynamics in Clays: Insights from Molecular Simulations for Experimental QENS Analysis

We measure H2O dynamics in a well-defined synthetic hectorite clay by the neutron spin echo technique, in the temperature range from 240 to 347 K. The interlayer spaces of this anisotropic material contain two layers of confined water, corresponding to the so-called bihydrated state. We analyze the experimental data in light of parallel molecular dynamics simulations. Simulations demonstrate that H2O diffusion in the direction perpendicular to the clay layers is not negligible and has to be taken into account in the experimental data analysis. A diffusive model with only two fitting parameters D⊥ and D∥ is well adapted for such analysis. A clear physical meaning for the two fitting parameters exists, in view of the geometry of the system. Experimentally, the diffusion coefficients parallel to the clay layers D∥ were estimated to be slowed down by a factor of 5 compared to bulk water. Further, the activation energy of the diffusion process is higher than in bulk water especially toward the lower temperatur.