Miracle-dz/UniFAR-FTUs huggingface dataset:
Social Media Technology Adoption for Improving MSMEs Performance in Bandung: a Technology-Organization-Environment (TOE) Framework

The use of the internet in business activities is a common thing to do in business world. Likewise, with MSMEs, many of them have already used the internet in their business activities. City and Regency of Bandung are the two regions that experience the best MSMEs growth in West Java. This is because these two regions are included in the position of three regions with the largest number of MSMEs in West Java. In addition, the two regions consistently won the achievement as five regions in West Java with the best financial performance measured by the ratio of cost to income. This study is expected to provide several implications related to social media technology adoption with determinant factors of TOE (technology, organization, environment) to improve the business performance of MSMEs. Researchers used quantitative research methods namely causal, with SEM (Structural Equation Model) analysis techniques by SMART PLS 2.0 software. The sampling technique chosen is accidental with a total of 400 respondents. Finding from this research which technology, organization, and environment are the factors that encourage MSMEs in adopting social media, then will impact the performance of MSMEs which include customer services, sales, marketing, and internal operations.
Selection of Optimal Number of Clusters and Centroids for K-means and Fuzzy C-means Clustering: A Review

In image segmentation, clustering is the process of sub dividing the whole image into the meaningful sub images. The most commonly used image segmentation algorithms such as K-means and Fuzzy c-means clustering face the specific important problem in selecting the optimal number of clusters and the corresponding cluster centroids. Plenty of research works have been done on the limitations of the said clustering algorithms to improve the efficient isolation of clusters. This paper enumerates the works done by different researchers in selecting the initial number of clusters and the centroids using K-means and Fuzzy c-means clustering. The limitations and applications of the above mentioned clustering algorithms are explored.
Performance study of ACO-OFDM and DCO OFDM in optical camera communication system

In this paper, two forms of optical OFDM (orthogonal frequency division multiplexing) have been investigated that are suitable for optical camera communication systems. The distinction is rendered by evaluating bit error rate versus signal to noise ratio of optical camera communication systems but, it is power effective for higher SNR values. This was because the DC bias used in DCO-OFDM is unreliable as for the optical capacity, whereas utilizing just half the subcarriers to transport data in ACO-OFDM in terms of bandwidth is unsuccessful. In addition to that, this research will be focused on optical camera communication system and implementation in the case of use for optical OFDM, which produces the clipping noise. However, they will gain SNR overall if we choose a good clipping factor. We found that ACO OFDM is better because of lower bit loading. This research explores the difference between the 2D ACO-OFDM and the 2D DCO-OFDM from the perspective of implementation. This enables us to test all the performance without any required hardware configuration. In this paper, the BER versus SNR ratio analysis for two optical wireless communication systems has been studied for different clipping factors: 0.8, 1, and 2. The BER performance of the two forms of optical OFDM. The single-carrier modulation solution is often contrasted to show the robust efficiency of the proposed method. This system has been implemented using Lab-view 2019 software.
Lossy Mode Resonance Sensors based on Tungsten Oxide Thin Films

Tungsten oxide (WO3) thin-films fabricated on glass slides have been proven to generate lossy mode resonances (LMRs) in the visible region. Obtained devices were characterized in transmission by lateral incidence of light on the edge of glass slides. Resonances at both TE and TM polarizations were analyzed for different thicknesses and in different deposition conditions. Moreover, it was successfully proved that WO3 coated glass slides present a high sensitivity to refractive index, which opens the path to the application of this structure in the domain of optical sensors
Towards the Use of Artificial Intelligence on the Edge in Space Systems: Challenges and Opportunities

The market for remote sensing space-based applications is fundamentally limited by up- and downlink bandwidth and onboard compute capability for space data handling systems. This article details how the compute capability on these platforms can be vastly increased by leveraging emerging commercial off-the-shelf (COTS) system-on-chip (SoC) technologies. The orders of magnitude increase in processing power can then be applied to consuming data at source rather than on the ground allowing the deployment of value-added applications in space, which consume a tiny fraction of the downlink bandwidth that would be otherwise required. The proposed solution has the potential to revolutionize Earth observation (EO) and other remote sensing applications, reducing the time and cost to deploy new added value services to space by a great extent compared with the state of the art. This article also reports the first results in radiation tolerance and power/performance of these COTS SoCs for space-based applications and maps the trajectory toward low Earth orbit trials and the complete life-cycle for space-based artificial intelligence classifiers on orbital platforms and spacecraft.
Synchronization Control of Position and Velocity for Heterogeneous Teleoperation System

Due to different mechanical structures, communication methods and task spaces, the master robot and the slave robot in a heterogeneous teleoperation system are difficult to keep synchronization. This paper presents a synchronization control strategy of position and velocity for the heterogeneous teleoperation system. The interaction force between the operator and the master is utilized to make the master generate the position information and position variation. The position information of the master is used to control the position of the slave. Meanwhile, the position variation of the master is employed to indirectly control the velocity of the slave. In this way, the position and velocity of the slave can be in synchronization with those of the master. The experimental results demonstrate that with the proposed control strategy the slave can act on the target more accurately and quickly, enhancing the operator's operational flexibility.
Effects of Sorghum Cultivar on Injera Quality

ABSTRACT Injera is an Ethiopian flat bread made from cereals, with tef preferred for the best quality injera. Because sorghum is less expensive in Ethiopia, there is great interest in improving the quality of sorghum injera. Effects of cultivar on injera quality were studied using 12 Ethiopian sorghum cultivars of varying kernel characteristics. White tef with good injera making quality was included as a reference. Injera quality was evaluated using two techniques: descriptive sensory analysis of fresh injera and instrumental texture analysis of injera stored over a storage period of 48 hr using a three-point bending rig. Principal component analysis (PCA) of sensory data associated fresh injera from sorghum cultivars 3443-2-op, 76TI #23, and PGRC/E #69349 of varying endosperm texture, with positive injera texture attributes of softness, rollability, and fluffiness. Across the two seasons, texture analysis showed injera prepared from AW and CR:35:5, both with soft endosperm, required the least force to be.
Deep Complex-Valued Network for Ego-Velocity Estimation with Millimeter-Wave Radar

The estimation of the precise ego-velocity of a sensor is a crucial for advanced applications such as object tracking, localization, and autonomous driving. We have observed that the phase of complex-valued radar data contains abundant information, and that a delicate network design is required to fully incorporate the information. In this study, we propose an end-to-end neural network based method that is not affected by prior processes. Our approach is not subjected to the unambiguous maximum velocity problem of the radar. Furthermore, it is not necessary to accurately measure the mounting position or the viewing angle of the sensor. Experimental results based on extensive real-world dataset verify the advantages of the proposed method.
Hydrophobicity changes in silicone rubbers

Water repellency, high surface resistivity, vandalism resistance, low density and good processability have made silicone rubbers based on polydimethylsiloxane (PDMS) very attractive materials in housings for outdoor insulation. Their ability to recover hydrophobicity after oxida. tion or contamination is of paramount importance and this is the topic of this review. A critical evaluation of the chemical and physical mechanisms responsible for hydrophobicity loss and recovery is presented.
Preparation and characterization of disk-shaped hematite particles by a forced hydrolysis reaction in the presence of polyvinyl alcohol

The effect of polyvinyl alcohol (PVA) on the formation of spherical hematite particles from a forced hydrolysis reaction of acidic FeCl3 solution was examined. With increasing the PVA concentration, the shape of hematite particles was varied from spherical to disk-like by reducing their thickness. TEM and SEM observations clearly revealed that the disk-like hematite particles with average diameters of ca. 500 nm and aspect ratios of about 2 are consisting of aggregated cluster particles with a diameter of ca. 5–10 nm. The hematite particles formed with PVA were hydrohematite with a crystal lattice distortion and exhibited a polycrystalline nature. These particles changed from microporous to mesoporous after elimination of residual PVA molecules adsorbing on cluster particles by evacuating the samples above 300 °C. This result supports the fact that hematite particles produced by the forced hydrolysis reaction are aggregates, as we further revealed recently by using simultaneous temperature programmed desorption, mass spectroscopy and thermogravimetric measurements (Phys. Chem. Chem. Phys., 2001, 3, 2949). It was suggested that the large voids between the cluster particles filled with PVA molecules within the disk-like particles produce mesopores after eliminating the PVA molecules.
Cross-Tier Interference Avoidance Technique for LTE-A Femtocell Networks Using Fractional Frequency Reuse

Deploying femtocell overlays over LTE-A macrocellular networks is an effective way to overcome the scarcity of bandwidth, increase the network coverage, enhance the indoor users’ performance, and improve the quality of service. Nevertheless, it will bring the cross-tier interference issue to prominence leading to dramatic degradation of these networks’ performance if no strategy is taken to tackle this problem. Using the Fractional Frequency Reuse (FFR) concept can be one of the good solutions to manage this interference. This paper proposes an FFR scheme for LTE-A femtocell networks to handle the downlink cross-tier interference, generated between macro-cells and femtocells, in order to increase the Signal-to-Interference and Noise Ratio (SINR) and improve the overall network performance. The simulation results obtained by MATLAB reveal the superiority of the proposed-FFR scheme over the non-FFR one; as both SINR and user throughput have been enhanced. Outage probability results also prove that the proposed scheme can effectively support more users.
Tolerance Compensation based on Gaussian Processes for Angle Measurements with Magnetic Sensor Arrays

Magnetic sensors are very common in automotive electronics and other mechatronic applications. For example, they determine the rotation angle in motors or the steering angle. Our research aims to combine the modern sensor technology of the tunnel magnetoresistive effect (TMR) with the concept of the sensor array. The goal is to achieve both increased immunity against magnetic interference fields from external sources and high accuracy despite remarkable mechanical tolerances. For this purpose, a method for angle detection is presented, which compensates the misalignment after an initial training phase. The special feature is that all elements of the array are always included for the reference values and a covariance matrix is stored instead of a single calibration reference value. The result in the operation phase is estimated by regression and weighting values. This model-free procedure uses the redundancy of the available information in the sensor array. The algorithm is based on the theory of stochastic Gaussian processes. Nevertheless, a particularly effective digital implementation is provided for a processing chip of the sensor array. In addition, the self-diagnosis of the functionality of the elements of the sensor array will be possible.
Nanoporosity induced by ion implantation in deposited amorphous Ge thin films

The formation of a nano-porous structure in amorphous Ge thin film (sputter-deposited on SiO2) during ion irradiation at room temperature with 300 keV Ge+ has been observed. The porous film showed a sponge-like structure substantially different from the columnar structure reported for ion implanted bulk Ge. The voids size and structure resulted to be strongly affected by the material preparation, while the volume expansion turned out to be determined only by the nuclear deposition energy. In SiGe alloys, the swelling occurs only if the Ge concentration is above 90%. These findings rely on peculiar characteristics related to the mechanism of voids nucleation and growth, but they are crucial for future applications of active nanostructured layers such as low cost chemical and biochemical sensing devices or electrodes in batteries.The formation of a nano-porous structure in amorphous Ge thin film (sputter-deposited on SiO2) during ion irradiation at room temperature with 300 keV Ge+ has been observed. The porous film showed a sponge-like structure substantially different from the columnar structure reported for ion implanted bulk Ge. The voids size and structure resulted to be strongly affected by the material preparation, while the volume expansion turned out to be determined only by the nuclear deposition energy. In SiGe alloys, the swelling occurs only if the Ge concentration is above 90%. These findings rely on peculiar characteristics related to the mechanism of voids nucleation and growth, but they are crucial for future applications of active nanostructured layers such as low cost chemical and biochemical sensing devices or electrodes in batteries.
E-Service and Logistics Service Quality in E-Commerce, Study Case: Shopee Indonesia

E-commerce in Indonesia is growing fast. Nowadays, people tend to purchase things through e-commerce. However, the players within the e-commerce business not only e-commerce platform itself, but there are also logistics providers and customers. Both e-commerce and logistics services have service quality that plays an important role for the customer. This study uses descriptive research to analyses the impact of e-commerce service quality and logistics service quality on customer satisfaction and customer loyalty. This research used purposive sampling form Shopee Indonesia, as top 2 market leader in Indonesia Market. Data collected through online questionnaires with total respondents consisted of 546 Shopee users. Data is processed with Structural Equation Modelling method and for data analysis using LISREL software version 8.8. The results conclude that the e-service quality and logistics services quality both has a direct and positive impact on customer satisfaction and customer loyalty. This study helps e-commerce and logistics services to understand their customer so they can improve their service quality to keep existing customer and attract the new customer.
IN VITRO ACTIVITY AND COMPARATIVE STUDIES OF SOME ORGANOTIN(IV) BENZOATE DERIVATIVES AGAINST LEUKEMIA CANCER CELL, L-1210

A series of dibutyl-, diphenyl- and triphenyltin(IV) benzoate derivatives has been prepared. The products were obtained by reacting the dibutyltin(IV) dichloride, diphenyltin(IV) dichloride and triphenyltin(IV) chloride respectively via the dibutyltin(IV) oxide, diphenyltin(IV) dihydroxide and triphenyltin(IV) hydroxide with benzoate acid and its derivative. The targeted compounds have been tested with anticancer activity against leukemia cancer cell, L-1210. The compounds synthesized were well characterized by 1 H and 13 C NMR, IR and UV-Vis spectroscopies as well as based on the microanalytical data. The results showed that triphenyltin(IV) benzoate and its derivative prepared exhibit higher anticancer activity than those of dibutyltin(IV) and diphenyltin(IV) analogous.
Effect of Adhesion on Aggregation in Nanoparticle Dispersions

The detailed structure of a dispersed nanoparticle suspension has been studied by transmission electron microscopy and dynamic light scattering for comparison with an off-lattice gas computer model. For low adhesion between particles, the structure of the suspension is shown to be a “gas with clusters” phase of particles comprising aggregates ranging from singlets, doublets, triplets, etc. to 16-plets in a continuous distribution. Further increasing the adhesion between the particles reduces the number of singlets and causes larger aggregates to form, without precipitation, as some condensed phase appears in the gas. This phase appears as metastable clumps, which do not grow rapidly until adhesion is raised. Then, at high adhesion, flocculation occurs with aggregates growing with time and a large reduction in the number of singlets. Experiments on monosize 62-nm-diameter hematite particles in water confirm this behaviour. An off-lattice computational model based on a square well adhesion potential qualitatively described the dynamic light scattering and transmission electron microscopy results.
The shelf-life of dairy products : 2. Raw milk and fresh products

In the second of this series of articles, the specific factors controlling the shelf-life of raw milk, pasteurized milk and cream, cottage cheese and yogurt are considered. The shelf-life of raw milk depends on the quality of the milk ex-farm and on subsequent transport and storage conditions. Shelf-life may be enhanced by deep cooling or thermization. Post heat treatment contamination by Gram negative psychrotrophic bacteria is the major determinant of shelf-life of pasteurized products. In cultured dairy products, yeast and mould contamination is the most usual cause of spoilage.
Unbalanced Magnetic Pull Effects on Rotordynamics of a High-Speed Induction Generator Supported by Active Magnetic Bearings – Analysis and Experimental Verification

Unbalanced magnetic pull (UMP) resulting from air-gap eccentricity can present a potential risk to the lifetime and dynamic stability of high-speed electrical machines. Nevertheless, a method to identify the effects of UMP in actual industrial machines has not yet been sufficiently developed. In this paper, methods for analysis and experimental verification of UMP effects are studied using a high-speed two-pole induction generator supported by active magnetic bearings (AMBs) as a case example. The UMP force is calculated using a semi-analytical model that combines an analytical model with a correction factor obtained from finite element analysis (FEA) results. Using this model, the characteristics of time-variant UMP that are related to the effects of UMP on rotordynamics are investigated. Coefficients for the rotor–bearing simulation model are identified using a detailed CAD model and experimental modal analysis data. Linearized coefficients of AMBs are identified based on the rigid body whirling mode of the rotor. Then, UMP effects are investigated by conducting a time-step rotordynamic simulation in the mixed eccentricity condition, and the results are verified by comparing them with the vibration measurement results during ramp-down operation of the test machine. Results show two main effects produced by UMP on the rotordynamics of induction machines, namely reduction in the rotor natural frequency and additional vibration caused by twice the supply frequency excitation, thus confirming that the proposed semi-analytical UMP model is suitable for the rotordynamics simulation and achieves a high accuracy with efficient computation.
Progress on the Study for the Use of Long-Range Radars for Space Situational Awareness

In [1] the authors describe the results achieved in an experimental test conducted with the Leonardo RAT (Radar Avvistamento Terrestre) 31DL long range radar in December 2014 - January 2015 to test the capability of the radar to detect and track Low Earth Orbit (L EO) satellites with an external cue command derived by the NORAD (North American Aerospace Defense Command) Two Line Elements (TLE). After that experimental trials, a research activity was organized by Leonardo spa and RASSCNIT (Radar and Surveillance System – National Inter universitary Consortium for Telecommunications) with the following main goals: (i) propose new signal and data processing approaches to improve the radar performance and (ii) predict performance obtainable with the network of RAT 31 DL currently deployed on the Italian territory, so demonstrating a dual use capability of radars primarily employed for aerial surveillance. The aim of this paper is to demonstrate the capability in the SST (Space Surveillance and Tracking) scenario of such a network, in particular demonstrating the advantages in terms of coverage maps and accurate or bit determination when using a sensor network. The results are based on simulated data obtained with a simulation tool developed by CNIT RASS, able to analyse different scenarios and or bits.
Heat Transfer From Normally Impinging Flames

Abstract An investigation is described relating to the prediction of rates of convective heating from normally impinging hydrocarbon oxygen flames to a plane surface. A transient calorimeter was employed to measure the heat transfer and the technique incorporated a means for the determination of heat losses. The theoretical approach was based on the modification of a semi- empirical heat transfer equation. A comparison of the experimental and theoretical results showed that for several of the flames studied large experimental over-estimates or under-estimates of the calculated equilibrium flow heat transfer values were obtained depending upon the extent of mixing induced turbulence at the plane of impingement in the free firing flame and the proximity of the impinged surface to the primary flame cones. It was postulated that the inhibition of heat transfer rates by mixing induced turbulence was dependent upon the radius of curvature of the impinged surface.