Miracle-dz/UniFAR-FTUs huggingface dataset:
PREPARATION AND PHOTOLUMINESCENCE FEATURES OF EUROPIUM COMPLEX

The lanthanide complex of europium ion with BAA (2-benzoylacetanilide) was successfully synthesized and their photoluminescence features were investigated. The BAA and its complex were characterized by various techniques such as IR, NMR, CHN elemental analysis, UV-visible and photoluminescence spectroscopy. The complex exhibited the luminescence of the europium(III) ion in visible region ascribed to the efficient energy transfer from ligand to the central metal. Upon excitation at 395 nm, the emission spectra of complex showed characteristic peaks of europium ion at 580 nm, 591 nm, 613 nm and 651 nm assigned to D0→F0, D0→F1, D0→F2 and D0→F3 electronic transitions, which originate due to transition between excited D0 state and ground Fj (j = 0, 1, 2 and 3) state of europium ion. The color coordinates of the complex located in the red region of the chromaticity diagram. These results suggested that the complex can be potential applied for display devices.
Adaptive Cruise Control of Vehicle Platoons with Wireless State Information

Abstract In this paper, we propose a novel method for identifying reduced longitudinal model parameters of vehicles in order to design real-time cooperative adaptive cruise controllers (CACC). We use weighted and filtered accelerations of all preceding vehicles guaranteeing the string stability of highway platoons. As the preliminary step of this strategy, we discuss efficient system modeling and parameter identification of various commercial vehicles for platooning purposes. Then, we analyze effects of platoon topology and filtering preceding vehicles' wireless state information on string stability. Next, the effects of vehicle ordering in the highway strings are discussed for the stability and safety of heterogeneous platoons. The contribution of new CACC strategy over adaptive cruise controllers is discussed based on simulation and practical experiment results.
RELIABILITY AND APPLICABILITY OF NAKAMURA'S TECHNIQUE USING MICROTREMORS: AN EXPERIMENTAL APPROACH

Nakamura's technique has been widely discussed from the theoretical point of view. Very little information is available as far as the experimental, on-the-field standpoint is concerned. A series of experiments under controlled conditions were set up to assess the reliability and applicability range of this microtremor technique. Since this approach to microzonation is particularly appealing in urban environments, great care was devoted to evaluate the influence of factors such as anthropic noise, concrete or asphalt coverings and soil-structure interaction. Environmental factors (wind) and the influence of sensors were also considered. The results were compared with the seismic response from four earthquakes. The set of experiments shows that under proper measurement conditions Nakamura's technique provides stable and reliable results, but great care has to be devoted to avoid factors that may significantly and adversely affect the results.
Impact of sub-volume excitation on improving overdrive delay product of sub-40 nm perpendicular magnetic tunnel junctions in adiabatic regime and its beyond

In this paper, we introduced a new figure of merit, overdrive delay product Pod which is defined as the product of overdrive factor (I/Ic0 − 1) and delay of transit time, to evaluate power consumption and switching delay from the viewpoint of perpendicular magnetic tunnel junctions (p-MTJs) switching. The impact of sub-volume excitation on the dependence of overdrive delay product on the junction size and material parameters of p-MTJs in adiabatic regime were clarified. Two strategies to decrease the Pod were proposed. The first strategy is scaling down the junction size free from sub-volume effect. A reduction more than 86% of Pod of p-MTJ with exchange stiffness Aij = 19 pJ/m was realized by scaling down the junction size from 70 to 10 nm when I/Ic0 − 1 = 0.5. The second strategy is to increase Aij to suppress the effect of sub-volume excitation. A 26% reduction of the overdrive delay product was realized by enlarging Aij from 10 to 31 pJ/m with annealing process in the p-MTJ with the diameter of 40 nm. These results indicate that p-MTJs of embedded magnetoresistive random access memory (MRAM) should be scaled down under 30 nm where no sub-volume effect occurs for high speed programing.
Crisis and Changes in Learning Behaviours: Technology-Enhanced Assessment in Language Learning Contexts

ABSTRACT The outbreak of COVID-19 has posed a sudden and unprecedented change to the educational system. This study investigated the impact of this sudden change on EFL learners’ perceptions of assessment in a technology-enhanced learning environment. Assessment dimensions such as affective factors, validity, reliability, practicality, security and pedagogy were explored through an online questionnaire administered among 345 Iranian EFL learners and a focus-group interview with 17 learners. In addition, through a quasi-experimental design, the study compared the learners’ academic achievements of online and in-person classrooms during the COVID-19 outbreak. The findings revealed that the flexibility of online assessment, immediate feedback and encouraging self-regulated learning are among the advantages and technical problems, technology dependence and technology literacy are among the challenges of technology-enhanced assessment. The findings indicated that while technology-enhanced assessment has a positive impact on learners’ performances, learners have various attitudes towards e-assessment that need to be addressed in future studies.
Nitrate fertilization may delay autumn leaf senescence, while amino acid treatments do not

Fertilization with nitrogen (N)-rich compounds leads to increased growth, but may compromise phenology and winter survival of trees in boreal regions. During autumn, N is remobilized from senescing leaves and stored in other parts of the tree to be used in the next growing season. However, the mechanism behind the N fertilization effect on winter survival is not well understood and it is unclear how N levels or forms modulate autumn senescence. We performed fertilization experiments and showed that treating Populus saplings with high or low levels of inorganic nitrogen resulted in a delay in senescence. In addition, by using precise delivery of solutes into the xylem stream of Populus trees in their natural environment, we found that delay of autumn senescence was dependent on the form of N administered: inorganic N (NO3−1) delayed senescence but amino acids (Arg, Glu, Gln, and Leu) did not. Metabolite profiling of leaves showed that the levels of tricarboxylic acids (TCA), arginine catabolites (ammonium, ornithine), glycine, glycine-serine ratio and overall carbon-to-nitrogen (C/N) ratio were affected differently by the way of applying NO3−1 and Arg treatments. In addition, the onset of senescence did not coincide with soluble sugar accumulation in any of the treatments. Taken together, metabolomic rearrangement under different N forms or experimental setups could modulate senescence process, but not initiation and progression in Populus. We propose that the different regulation of C and N status through direct molecular signaling of NO3−1 could account for the contrasting effects of NO3−1 and Arg on senescence. One sentence summary Nitrate, administered by precision fertilization through injection into the trunk, may delay autumn senescence and change metabolism in Populus leaves, while the same amount of amino acids does not have the same effect.
Generation of ready-to-use SPR chips using automated nano-spotting

Microarray technology and protein biochips have advanced a lot in the past years and have allowed for substantial progress in bioanalysis and biosensors, especially in the fields of proteomics, protein quantification and functional protein evaluation. In combination with surface plasmon resonance (SPR)-based biosensors they have become important research tools for the real-time detection of molecular interactions, especially without having to resort to labeling. SPR offers numerous advantages over alternative methods, including rapid and real-time detection, high sensitivity and low sample consumption, and has been widely adopted both in basic research and in industry. In this paper we describe the functionalization of Cytomegalovirus pp65 antigen on SPR chips utilizing a nanoplotter robotic platform for the preparation of microarrays with up to 138 spots.
Zero-Voltage-Switching Buck-Boost Converter with a Coupled Inductor Based on Magnetic Materials

A zero-voltage-switching (ZVS) buck-boost converter with a coupled inductor based on magnetic materials is proposed in this paper. An auxiliary circuit consisting of an additional winding to the main inductor, an auxiluary inductor, and an auxiliary diode is utilized to obtain the ZVS operation of power switches. Due to the ZVS operation, the switching loss is significantly reduced. The operation principle and steady-state analysis of the proposed converter are provided. A prototype of the proposed converter is developed, and its experimental results are presented for validation
Hybridising Signaling Principle And Nielsen’s Design Guidelines In A Mobile Application

Learning via mobile phone is very common nowadays, whether at the primary or tertiary stage. The use of mobile phones is causing growing concern among the general public. Improving online education, primarily via this device, is also one of the government’s most pressing needs. Most current research on mobile learning applications pays little attention to multimedia principles, especially the Signalling principle, to improve user interaction. As a result, this project is undertaken to suggest better and more efficient mobile learning applications. The model is developed in collaboration with various stakeholders, including content experts, HCI experts, actual users, and a thorough literature review. Creating these mobile learning design guidelines is anticipated to lead to a more efficient and successful mobile learning style. According to the results of the experiments, implementing the hybridised guidelines resulted in a significant increase in Asmaul Husna Islamic knowledge among university students.
Tunnel detection and localisation via multi-monostatic radio frequency tomography using magnetic sources

An inverse scattering approach is presented to detect, localise and estimate the geometry of buried dielectric targets, in a 2D scenario, by exploiting magnetic sources as transmitting antennas. Explicit formulas to compute the scattered field from dielectric anomalies are derived for both homogeneous and half-space background scene. A linear inverse scattering approach is formulated and analysed for both the scenarios; finally, the performance of the two proposed approaches is tested against full-wave finite-differences in time-domain (FDTD) data simulating the exact scattering phenomenon.
PCK do Licenciado em Computação: Especificidades Pedagógicas da Docência em Computação

Apresenta-se nesse estudo, os sete principais atributos que compõem o Conhecimento de Conteúdo Pedagógico do professor de computação. A discussão desse artigo é parte dos resultados de uma tese de doutorado desenvolvida a partir da abordagem metodológica mista (quali/quanti) e da análise de conteúdo. O público participante da pesquisa compreende 60 egressos da licenciatura em computação de instituições das cinco regiões do Brasil. Conclui-se que os professores de Computação demonstram que sua base de Conhecimento de Conteúdo Pedagógico para o ensino de Computação é orientada pelos seguintes atributos: autonomia, transposição didática, contextualização, pensamento/raciocínio computacional, mediação, interdisciplinaridade, e planejamento.
Polyketides and their synthesis

(57) Abstract: Type I polyketide synthase (PKS) is a complex multi-enzyme having one loading domain and a plurality of extension domains bound thereto. When the first extension module receives an acyl starter unit from charging domain, each extension module, continue to add ketide units will undergo processing (reduction, etc.) one by one. We have found that Ksq domain found in certain PKS has decarboxylation activity, for example to produce (substituted) from malonyl a (substituted) acyl. CLF domain of Type II PKS also have similar activity. The loading module with this type of domain, typically by inserting the PKS with no such domain, it is possible to adjust the starting unit for use.
Power Optimizing of Solar Photovoltaic Systems

Efficient energy yield is a major concern in solar photovoltaic (PV) systems. This paper describes a distributed control system to optimize the power output of the PV systems. The PV systems contain many PV modules. And every PV module has a monitoring and control network node. The communication data are successfully transmitted using a low-cost ZigBee wireless network. The field conditions are monitored by voltage, current, irradiance, and temperature sensors. The power operating point tracking is implemented at the PV module level. The reference voltage is calculated based on a neural network model, which is used to identify maximum power point. And the output voltage is regulated by a digital controller in the integrated converter according to the reference voltage. Experiments show that the power output can be greatly increased with this distributed control system under many shadow conditions.
Transfer learning method for rolling bearing fault diagnosis under different working conditions based on CycleGAN

In practical bearing fault diagnosis tasks, the available labeled data are often not from the equipment to be diagnosed and cannot cover all manner of working conditions. The adopted data-driven method is required to have a certain degree of cross-domain and cross-working condition transfer learning diagnosis ability. However, limited by the performance of existing transfer learning methods, the potential difference between the source domain and the target domain poses a challenge for the accuracy of transfer diagnosis. In this paper, a cross-working condition data supplement method based on the cycle generative adversarial network (CycleGAN) and a dynamics model is proposed, which can use limited available data to approximate the missing parts of existing data and be used for diagnosis of the target domain. First, we considered the limited experimental data as the target domain, the simulation data corresponding to the working condition as the source domain and used the working condition as the benchmark to constrain the data correspondence between the two datasets. We then used the CycleGAN model to learn the feature mapping from simulation to experiment. Second, based on the working condition of the data to be tested, the corresponding simulation data were input into the trained generator to obtain labeled data with experimental characteristics under the corresponding working conditions, and transferred the dataset as the source domain data to the data to be tested. In the test using self-made simulation and experimental datasets, combined with the transfer learning method based on the probability distribution adaptation, it was shown that the proposed method could effectively improve the diagnostic impact of the single transfer learning method in cross-domain and cross-working conditions when the working condition span was large.
Efficacy of Coconut Oil in The Control of Acute Tungiasis

Tungiasis is a disease caused by a jigger flea (Tunga penetrans). The flea turns into an ectoparasite once embedded on the host. It is a public health problem in Kenya, particularly in poor rural communities. There is therefore a need to explore the possibilities of developing local, innovative solutions to this problem. The efficacy of coconut oil in controlling tungiasis in a rural setting in Kenya was, evaluated with a view of developing a solution based on scientific data. A baseline survey was, carried out to assess infestation and severity of the disease. A severity score for acute disease was, used in the study. A cohort of 39 individuals, with varying degrees of infestation was, recruited for treatment and follow up. The recruited study participants were first examined for a period of 30 days followed by an intervention treatment with coconut oil applied twice daily for a period of ten weeks to prevent re-infestation. The spearman rank correlation coefficient was, calculated to assess the significance of the association between the severity scores and infestation rate. The correlation coefficient was strong (r = 0.6). To compare findings before and after the intervention, the mean of each variable was determined for each patient during baseline assessment and during the intervention. The difference between baseline and after intervention results was, assessed using Wilcoxon matched pairs signed rank test and found to be significant. These results indicated that coconut oil could provide a reliable, simple and inexpensive means of controlling the disease.
Unidirectional uwb array antenna using leaf-shaped bowtie elements and flat reflector

A study of a UWB array antenna is presented, which is composed of leaf-shaped bowtie radiating elements printed on a dielectric substrate. With the use of a flat reflector, the presented antenna has unidirectional radiation characteristics and higher directivity in comparison with omnidirectional UWB antennas. In the maximum radiation direction of the proposed antenna, the actual gain of 10.3-13.3 dBi is achieved over the frequency range of 4.1-10.0 GHz (-3 dB gain bandwidth of 91%).
The Research on Mechanism of Contre-Coup Injury in Brain Decelerating Impact Based on Trolley Experiment

Based on the platform of trolley equipment, this paper used a liquid containing gas as a sensor to establish a new testing method in order to simulate the mechanism of contre-coup injury during head decelerating impact. After pouring the liquid containing gas into the transparent skull model, the head model was sealed and fixed to the trolley. Then the trolley was trigged to impact the counterguard as the speed of 50km/h, the impacting course was recorded by a high-speed camera at the same time. Finally, the movement of the gas in the liquid during the impact was analyzed using the sequence pictures analyzing software as to ensure the area of negative pressure which appeared during the impact. The results showed that in the head decelerating impact the negative pressure can appear at the contre-coup site. This denoted that in the traffic accidents brain tissue of driver or passengers may suffer from tension injury at the contre-coup point. This paper provides a new equipment and method to research the biomechanical mechanism of contre-coup injury in traffic accidents which is helpful to understand the distribution of negative pressure in brain tissue during head decelerating impact.
Management of Phantom Limb Pain through Thalamotomy of the Centro-Median Nucleus

Background: Phantom limb syndrome is defined as the perception of intense pain or other sensations that are secondary to a neural lesion in a limb that does not exist. It can be treated using pharmacological and surgical interventions. Most medications are prescribed to improve patients’ lives; however, the response rate is low. In this case report, we present a case of phantom limb syndrome in a 42-year-old female with a history of transradial amputation of the left thoracic limb due to an accidental compression one year before. The patient underwent placement of a deep brain stimulator at the ventral posteromedial nucleus (VPM) on the right side and removal secondary to loss of battery. The patient continued to have a burning pain throughout the limb with a sensation of still having the limb, which was subsequently diagnosed as phantom limb syndrome. After a thorough discussion with the patient, a right stereotactic centro-median thalamotomy was offered. An immediate response was reported with a reduction in pain severity on the visual analogue scale (VAS) from a value of 9–10 preoperative to a value of 2 postoperative, with no postoperative complications. Although phantom limb pain is one of the most difficult to treat conditions, centro-median thalamotomy may provide an effective stereotactic treatment procedure with adequate outcomes.
Characterisation of CMOS APS technologies for space applications

In recent years, the performance of scientific CMOS active pixel sensors has been improved to the point that it is now approaching that of the current silicon sensor of choice, CCDs. For some applications, CMOS APSs is believed to present significant advantages over CCDs, such as improved radiation hardness. In this work, the effect of radiation damage on a ‘baseline’ commercial APS, e2v technologies’ Jade APS, is characterised in response to gamma, proton and heavy ion irradiation. Specific performance problems encountered during this radiation characterisation, such as dark current non-uniformity under gamma irradiation, random telegraph signals under proton irradiation, and single event effects under heavy ion irradiation are described and analyzed. The X-ray spectroscopic imaging performance of the device is measured and compared to the Ocean Colour Imager APS test array showing progress towards a high frame rate spectroscopic X-ray imager for space science. The implications of these results for using similar devices in space applications are considered. Furthermore, possible novel techniques for measuring inter-pixel responsivity non-uniformity, heavy ion detection and spectroscopy, and measuring the dynamics of radiation-induced trap formation are discussed.
A quasi-two-dimensional analytical model for the turn-on characteristics of polysilicon thin-film transistors

A physical model considering the effects of grain boundaries on the turn-on behavior of polysilicon thin-film transistors (poly-Si TFTs) is presented. Along the channel, the formation of the potential barrier near the grain boundary is proposed to account for the low transconductance and high turn-on voltage of TFTs. The barrier height is expressed in terms of channel doping, gate oxide thickness, grain size, and external gate as well as drain biases. Drain bias results in an asymmetric potential barrier and introduces more carrier injection from the lowered barrier side. It is shown that this consideration is very important for characterizing the saturation region under large drain-bias conditions. On the basis of the developed potential barrier model, the I-V characteristics are described by the interfacial-layer thermionic-diffusion model. Thin-film transistors on polycrystalline silicon with a coplanar structure were fabricated for testing. Comparisons show excellent agreement between the developed model and the experimental data. >