Miracle-dz/UniFAR-FTUs huggingface dataset:
Trend analysis in online data with unsupervised classification and appraisal categories

This paper presents a hybrid approach for identifying trends in social media datasets. This approach uses jointly unsupervised methods for text classification and an ontology of appraisal categories. First, data gleaned on social media are classified with unsupervised methods in order to produce more or less homogeneous clusters. Then, topics are detected within each cluster by using Latent Dirichlet Allocation (LDA). At cluster level, appraisal categories are identified thanks to an ontology build according to the principles of the Appraisal Theory. The joint identification of topics and appraisals offers a basis to analyze trending topics in social data. The paper investigates a novel means to detect trending topics in social data by utilizing unsupervised classification methods and focusing on subjective states such as affect, attitude, denial, disapproval, rejection, endorsement or support, associated with each class. Negative or positive polarity and intensity degrees are also identified, thanks to the appraisal ontology. The approach identifies the most dominant trends in social data as associations of topics and appraisal categories. The paper also discusses experiments carried out to detect trends on Twitter collections and the evaluation of theirs results in the light of manually validated data.
Multi-modal Video Fusion for Context-aided Tracking

There have been many advances in image fusion to support multi-modal, multi-perspective, and multi-focal day-night robust surveillance. Contextual analysis of multi-sensor exploitation supports many information fusion systems for target tracking, situation awareness, and scene understanding. This paper highlights an example for electro-optical and infrared image fusion analysis and colorization in support of simultaneous tracking and identification for physics-based and human-derived information fusion (PHIF). The results provide an ongoing discussion and analysis of the importance of context as both a source to guide information fusion systems (e.g., sensor mode selection), but also the need to be able to provide users with robust systems over context changes (e.g., variations in illumination).
Acceleration of Plasma Bullets by Grooved Dielectric Rod

In this work, we studied hollow cylindrical plasma bullets propagating along the grooved glass rod in a single electrode configuration. The plasma source was a cylindrical shell consisted of two coaxial glass cylinders. The surface of the inner cylinder was structured by creating grooves on its surface to investigate the plasma bullet acceleration through the traveling shell. The corresponding plasma jet was driven by a 6.2-kHz sinusoidal waveform using helium gas. Optical and electrical characteristics proved that the plasma jet was working in a stable bullet mode. The propagation speed of the hollow cylindrical bullet was evaluated along with the downstream of the jet axis inside and outside of the plasma carrier shell. The results showed that the charge associated with the bullets and corresponding root-mean-square (rms) value of the alternative current (ac) electric field were increased by creating the grooves on the path of the bullets. It was observed that the radiation intensity of the plasma was increased around each groove, too. The structured inner cylinder revealed that the dielectric properties play an essential rule in the plasma bullet propagation through tubes.
Alignment in the MSL Kibble balance

This paper discusses the alignment aspects of the MSL Kibble balance, which is based on a twin pressure balance setup. This novel design utilizes the features of the piston-cylinder unit in a pressure balance, where its strong self-centring force can provide a well-defined axis for the moving coil. Here we present the MSL Kibble balance in terms of its design features and operation, effects of misalignments of the piston-cylinder unit and requirements to mitigate this. In particular, we model the righting moment of the piston-cylinder system and show how this is essential for the alignment and operation of this Kibble balance.
Dual-Wavelength, High-Repetition-Rate, Compact Femtosecond Optical Parametric Oscillator

We demonstrate a dual-wavelength, compact femtosecond optical parametric oscillator (OPO) with high-repetition-rate, which is harmonically pumped by a ~101 MHz Yb-doped fiber laser system. The dual-wavelength output is realized by exploiting the bidirectional off-axis pumping technique, and the multiplication of repetition rate is derived by placing a nonlinear crystal in a miniaturized V-type cavity with only 16.5 cm length. By adjusting the detuning degree of the pump at one end, the maximum dual-wavelength gap is 66 nm from 1497 to 1563 nm. The time interval between the dual wavelengths can be adjusted freely. This is the first report on a dual-wavelength with the high-repetition-rate of GHz-level, femtosecond OPO system.
Determination of the Electrical Circuit Equivalent to a Pulsed Discharge in Water: Assessment of the Temporal Evolution of Electron Density and Temperature

Pulsed electrical discharges in dielectric liquids are intensively studied due to the wide range of applications in which they are implicated. Despite the simplicity of the experimental manipulation of these discharges, the underlying fundamental physics is relatively complex. In this study, we use the electrical characteristics, voltage and current, of pulsed discharges in water (various applied voltage and pulse width conditions) to determine the equivalent electrical circuit of the plasma. Based on a Mayr-type model, the plasma resistance is time-dependent, but the inductance is not. Considering that plasma resistivity also depends on electron density and temperature (Spitzer formula), the temporal evolution of these two parameters was also determined.
Time Allocation Optimization and Trajectory Design in UAV-Assisted Energy and Spectrum Harvesting Network

The scarcity of energy resources and spectrum resources has become an urgent problem with the exponential increase of communication devices. Meanwhile, unmanned aerial vehicle (UAV) is widely used to help communication network recently due to its maneuverability and flexibility. In this paper, we consider a UAV-assisted energy and spectrum harvesting (ESH) network to better solve the spectrum and energy scarcity problem, where nearby secondary users (SUs) harvest energy from the base station (BS) and perform data transmission to the BS, while remote SUs harvest energy from both BS and UAV but only transmit data to UAV to reduce the influence of near-far problem. We propose an unaligned time allocation scheme (UTAS) in which the uplink phase and downlink phase of nearby SUs and remote SUs are unaligned to achieve more flexible time schedule, including schemes (a) and (b) in remote SUs due to the half-duplex of energy harvesting circuit. In addition, maximum throughput optimization problems are formulated for nearby SUs and remote SUs respectively to find the optimal time allocation. The optimization problem can be divided into three cases according to the relationship between practical data volume and theoretical throughput to avoid the waste of time resource. The expressions of optimal energy harvesting time and data transmission time of each node are derived. Lastly, a successive convex approximation based iterative algorithm (SCAIA) is designed to get the optimal UAV trajectory in broadcast mode. Simulation results show that the proposed UTAS can achieve better performance than traditional time allocation schemes.
Ca ~(2+)and Calmodulin Are Involved in the Expression of Heat Shock Protein Gene in Arabidopsis

The involvement of calcium and different calmodulin isoforms (Ca 2+ -CaM) in heat shock (HS) signal transduction in Arabidopsis ( Arabidopsis thaliana ) was investigated. Using transgenic Arabidopsis plants which have the AtHsp18.2 promoter/GUS fusion gene, it was found that the level of b b b -glucuronidase (GUS) activity was upregulated by the addition of CaCl 2 and down-regulated by the calcium ion chelator EGTA, the calcium ion channel blockers LaCl 3 and verapamil, or the CaM antagonists N (6-aminohexyl)-5-chloro-1-naphthalenesulfonamide (W7), chlorpromazine (CPZ) and trifluoperazine (TFP). CaCl 2 not only increased the GUS activity after HS, but also upregulated the GUS activity under non-HS conditions. These results provide additional support for the involvement of the Ca 2+ -CaM signalling system in HSP gene expression. The expression of nine CaM genes (AtCaM1‐ 9) from Arabidopsis was differentially regulated by HS at 37 ∞ ∞ ∞ C. The expression of AtCaM3 and AtCaM7 genes increased during HS. The temporal expression of the AtCaM3, AtCaM7 and hsp18.2 genes demonstrated that up-regulation of AtCaM3 expression occurred earlier than that of AtCaM7 or hsp18.2 .
EFFICIENT FINITE DIFFERENCE METHODS FOR ACOUSTIC SCATTERING FROM CIRCULAR CYLINDRICAL OBSTACLE

We consider efficient finite difference methods for solving the three-dimensional (3D) acoustic scattering by an impenetrable circular cylindrical obstacle. By using the separation of variable and other techniques, we first transform the 3D problem into a series of one-dimensional (1D) problems in this paper, and then construct some efficient and accuracy finite difference methods to solve these 1D problems instead of the 3D one. There are mainly two advantages for these methods: one is that they are pollution free for the problem to be considered in this paper; and the other is that the linear systems generated from these schemes have tri-diagonal structures. These features lead to easy implementation and much less computational cost. Numerical examples are presented to verify the efficiency and accuracy of the numerical methods, even with the wave number greater than 100.
Contact Force Estimation Method of Legged-Robot and Its Application in Impedance Control

Legged robots have extremely strong adaptability in different terrain environment and their stable walking in the wild is still a current research hotspot. Although they have shown great motion performance in recent years, most of them rely on high-performance sensors, especially force sensors settled on foot. However, it is impractical to select special forces sensors in the field environment, and the performance degradation and noise during the usage will bring fatal control defects. In order to solve this problem, we propose a foot contact force estimation method that does not require force sensors, and applies the estimated contact force to the impedance control of the legged robot to achieve the robot’s active compliance control. The method of force estimation is based on the generalized momentum of the robot. It only needs to provide the position information of the joint and the information of the applied control torque. The designed feedforward and compensation terms effectively improve the speed and accuracy of the force estimation. We improved the response speed of the system to the contact force by improving the structure of the impedance control, and applied the estimated contact force to the impedance control to achieve the stable motion of the quadruped robot. Simulation experiments verify the effectiveness of the proposed force estimation method.
Hardware Implementation of Hyperbolic Tangent Activation Function for Floating Point Formats

In this paper, we present the efficient hardware implementation of hyperbolic tangent activation function, which is most widely used in artificial neural networks for accelerating machine learning applications. The proposed design considers the floating point representation of numbers for the first time, the nonlinear nature of the activation function while sampling, and uses a lookup table for implementation. The unique way of dividing the input range into bins which follows the binary pattern reduces the hardware implementation cost. Furthermore, the input data itself is used as the address for lookup table; thus, no extra cost involved in hashing the lookup table and involves only one memory access time resulting in faster and efficient hardware implementation. Our design proves to be 3× faster when compared to similar hardware implementations using CMOS 90 nm process.
On Code Analysis Opportunities and Challenges for Enterprise Systems and Microservices

Code analysis brings excellent benefits to software development, maintenance, and quality assurance. Various tools can uncover code defects or even software bugs in a range of seconds. For many projects and developers, the code analysis tools became essential in their daily routines. However, how can code analysis help in an enterprise environment? Enterprise software solutions grow in scale and complexity. These solutions no longer involve only plain objects and basic language constructs but operate with various components and mechanisms simplifying the development of such systems. Enterprise software vendors have adopted various development and design standards; however, there is a gap between what constructs the enterprise frameworks use and what current code analysis tools recognize. This manuscript aims to challenge the mainstream research directions of code analysis and motivate for a transition towards code analysis of enterprise systems with interesting problems and opportunities. In particular, this manuscript addresses selected enterprise problems apparent for monolithic and distributed enterprise solutions. It also considers challenges related to the recent architectural push towards a microservice architecture. Along with open-source proof-of-concept prototypes to some of the challenges, this manuscript elaborates on code analysis directions and their categorization. Furthermore, it suggests one possible perspective of the problem area using aspect-oriented programming.
The Role of Compatibility and Task-Technology Fit (TTF): On Social Networking Applications (SNAs) Usage as Sustainability in Higher Education

This study aimed to alleviate the gap between the literature regarding the Social Networking Applications (SNAs) use for active collaboration and engagement as sustainability in higher education and task-technology-fit (TTF) and compatibility on their consequence on students’ satisfaction and their performance impact its sustainability used in higher education. Although researchers have examined (SNAs) usage within multiple situations, the roles of (TTF) and compatibility as mediating variables have not been investigated through TAM model and constructivism theory on measuring education sustainability. Overall 602 students and researchers took part in this study, which were selected from public university. Using the method of structural equation modeling (SEM), we surveyed to discover the perception of students toward the (SNAs). Based on the results, the (SNAs) use for collaboration and engagement as sustainability in higher education, and TTF and compatibility positively impacted the student’s learning performance on measuring education sustainability, and they were found to be completely pleased with the perceived ease of use and perceived usefulness. In conclusion, the role of TTF and compatibility presents positive influences performances related to sustainability for education; and both factors mediates associations among collaboration and engagement as sustainability in higher education, students’ satisfaction on (SNAs) usage and students’ performance related to sustainability for education. Therefore, their impact should be encouraged in learning processes in higher education institutions.
A Numerical Investigation on the Behavior of Electrons in the Bullet in the Atmospheric- Pressure Argon Plasma Jet

Electrons are generated abundantly in the plasma jet and play an active role in the mass transfer of reactive species in the aqueous solution in plasma medicine. Such an importance requires knowledge of the behavior of electrons in the plasma jet. The objective of this work is to understand the electron behaviors in the bullet in the plasma jet, including the angle spectrum of electrons (ASEs) and the related energy spectrum, so as to have an insight into those electrons which most probably interact with the target. The numerical modeling based on a needle–plate discharge configuration in conjunction with a 1-D Particle-in-Cell Monte-Carlo Collision (PIC-MCC) simulation method was used to achieve this task. The scattering angle of electron in the bullet is described using the angle between the electron scattering direction and the bullet propagation direction. The ASE in the bullet is close to a sinusoidal distribution. As the bullet propagates, the temporal evolution of ASE indicates that relatively more electrons in the bullet are scattered into the angle range below 90°, but at any moment when the propagating bullet is close to the target, ASE in the bullet generally remains unchanged. In addition, relatively less electrons in the bullet are scattered into the angle range below 90° due to the increase of the applied voltage amplitude. For the considered voltage amplitudes below 7 kV, the number of electrons in the angle range below 90° is within 47% of electrons in the bullet and, in these electrons, the proportion of non-subionization electrons reaches about 12%. These results may be taken into consideration in investigating the mass transfer of reactive species in plasma medicine.
The impossibility of unbiased judgement aggregation

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Effect of the development environment on the leaf anatomy of Cattleya jenmanii Rolfe and C. lueddemanniana Rchb.f. (Orchidaceae)

The orchids Cattleya jenmanii and C. lueddemanniana are important ornamental species, endemics of Venezuela. The commercial production is achieved by in vitro culture. During the acclimatization, there take place plant losses that imply additional costs. For the appropriate design of practices of culture in greenhouses, it is important to understand the effect of the acclimatization in the anatomy of in vitro plants. The intention of the present work was to describe and to compare the leaf anatomy of the two named species of orchids, grown in the orchidarium house and in two different moments of in vitro propagation (multiplication and acclimatization). Plants were cultured in the Murashige-Skoog medium Torres y Sanabria 200 (1962). The rooted vitroplants were acclimatized in a mist propagator during a week, humid chamber for four weeks and orchidarium for three weeks. The samples were processed by means of classical microtechnique procedures. The in vitro environment induced the thickness reduction of the leaf blade, epiderm and cuticle; mesophyll complexity reduction, hypoderm, fiber nodules, vascular bundles and idioblast absence. In the acclimatization stage, there was a trend to the acquisition of an similar structural organization to orchids house stage, but with characteristics of in vitro leaves. This suggests that the adjustment to the ex vitro conditions was not completed during eight weeks of acclimatization.
Effects of Age, Type of Auxin and Treatment Concentration on Rooting Ability of Larix leptolepis

Effects of age, type of auxin and treatment concentration on rooting ability of Japanese larch (Larix leptokpis) were systematically studied under mist irrigation on the open field. And general rooting effect for different treatments was e-valualed and the best combinations of auxin type × concentration were selected for different ages of Japanese larch ortet. Based on subordinate function values, the results was evaluated. Once the bests combinations selected are used to treat cuttings taken from test progeny of 12. 5 and 8. 5 years old Japanese larch, 78. 8% and 92. 5% rooting percentage can be obtained , which meant that rooting ability for vegetative propagation of older Japanese larch tree was dramatically improved. Variance analysis of three factors showed rooting ability of Japanese larch was extremely or obviously influenced by age (A) of donor tree, type of auxin (B) and treatment concentration (C). Extremely difference could be found in rooting percentage, root number per cutting, root length and rate of one-side rooting among ages or auxin treatment. There were obvious on extreme difference sparely in rooting percentage, root number per cutting and one-side rooting rate, and the in- teraction effect of three factors (A×B×C) or interaction effects between factors (A×B, A×C and B×C ) also gave extreme influence to most of rooting characters. From results of comparing the treatment of type of auxin and concentration, and interaction effect between them for different age of the donor trees, regular changing in rooting character cannot be fund obviously in this experiment.
A Literature Review of Inter-organisational Sustainability Learning

Sustainable development goals (SDGs) have become increasingly important for today’s firms as they build sustainability strategies that integrate SDGs into their core activities. Addressing these goals collaboratively, in line with SDG 17—partnerships for the goals, has gained momentum, hence the growing literature on sustainability-oriented partnerships. However, addressing SDGs through partnerships is not straightforward. For firms, contributing to SDGs through alliances and partnerships requires building environmental capabilities and embracing new value frames; in other words, going through the complex process of inter-organizational learning. This paper reviews the literature on sustainability-oriented partnerships with a focus on the inter-organizational learning process. As a result of the review, a model of inter-organizational sustainability learning is presented. This model captures the different levels and types of the inter-organizational learning process; partner and partnership characteristics that impact learning; the environmental conditions that set the conditions for learning to take place; the catalyst and inhibitors of learning; and finally outcomes of learning. This model expands and re-organizes the existing scholarly conversation about inter-organizational learning in the context of sustainability-oriented alliances and partnerships and offers a learning-based understanding of sustainability partnerships to practitioners. Based on the review, the paper proposes ideas for future research and contributes to the development of a future research agenda in the area of sustainability-oriented alliances and partnerships.