Miracle-dz/UniFAR-FTUs huggingface dataset:
Active Suppression of Rotating Stall and Surge in Axial Compressors

This paper reports on an experimental program in which active control was successfully applied to both rotating stall and surge in a multi-stage compressor. Two distinctly different methods were used to delay the onset of rotating stall in a four stage compressor using fast acting air injection valves. The amount of air injected was small compared to the machine mass flow, the maximum being less than 1.0%. In some compressor configurations modal perturbations were observed prior to stall. By using the air injection valves to damp out these perturbations an improvement of about 4.0% in stall margin was achieved. The second method of stall suppression was to remove emerging stall cells by injecting air in their immediate vicinity. Doing this repeatedly delayed the onset of stall, giving a stall margin improvement of about 6.0%. Further studies were conducted using a large plenum downstream of the compressor to induce the system to surge rather than stall. The resulting surge cycles were all found to be initiated by rotating stall and therefore the stall suppression systems mentioned above could also be used to suppress surge. In addition, it was possible to arrest the cyclical pulsing of a compressor already in surge.Copyright © 1991 by ASME
Effectiveness of Enhanced Learning Materials in Science for the Open High School Program

The study determined the effectiveness of Grade 8 Enhanced Learning Materials in Science for the Open High School Program under the K to 12 Basic Education Curriculum in Hagonoy National High School during the school year 2013-2014. The researcher used the randomized pretest-posttest control group experimental design in which participants were subjected to investigation from November 2013 to January 2014. The controlled group used the DepEd Learning Materials while the Experimental Group utilized the Enhanced Learning Material developed by the researcher. Pretest results revealed that both groups were at the beginning level of proficiency in Grade 8 Science. The Experimental Group has performed much better compared to the Control Group as revealed in the scores obtained by the two groups in the posttest. There is a significant difference in the achievement of the students and learning is higher on the part of the Experimental Group in the posttest conducted. Finally, it recommended that the Enhanced Learning Materials developed be adopted as instructional materials for teaching Grade 8 Science in the Open High School Program to facilitate learning and improve the academic achievement of the students.
Family Context Surrounding the Use of Technologies and Their Impact in Adolescents’ Media Multitasking

Recent studies pointed out that practically all adolescents are regular users of information and communications technology (ICT). Since the most usual context for the use of technology is the home, our aim is, on the one hand, to characterize the family technology context among adolescents aged between 11 and 18 years and, on the other hand, to analyse the relationship between multitasking and the different variables found within this family context. Participants were 977 adolescents. Significant relationship between the number of devices in the home and the frequency with which these are used are showed. Although a 60% of the adolescents have no parental rules over this use, there does not appear to be any relationship between the existence, or lack thereof, of rules over the use of ICT and multitasking. To reduce adolescents amount of media multitasking, we would recommend having fewer devices in the home rather than imposing rules about their use.
Distortion analysis in an omnidirectional image sensing system for assembly (OISSA)

In assembly, part misalignment must be detected and compensated for during the mating period, regardless of the complexity of a cross-sectional shape. In order to achieve these objectives, we have proposed a novel omnidirectional image sensing system for assembling parts with complicated shapes (OISSA), consisting of a pair of an inside-conic and an outside-conic mirror, a pair of plane mirrors, and a CCD camera. This system, however, has a distortion that varies with sizes and shapes of the parts and seriously affects the measurement accuracy. The distortion, therefore, needs to be compensated for in order that the sensing system is capable of detecting misalignments between mating parts, regardless of various shapes and sizes of the parts. In this paper, we analyze distortion features of the sensing system and propose a method for compensating the distortion. The feasibility of compensating the distortion will be also shown through simulations.
Translation and validation of an ageism scale for dental students in Switzerland.

PURPOSE This study aimed to validate an ageism scale for dental students in Switzerland. METHODS The original scale was first translated to German and then evaluated by 14 experts for relevance; four items were eliminated. Validation of the resulting questionnaire was performed at three Swiss dental schools. Principal component analysis (PCA) was performed; Cronbach's alpha (α) was used to assess the internal consistency reliability, and Pearson's coefficient to identify any correlations with demographic parameters (P < 0.05). RESULTS PCA revealed 11 items among 4 factors (Overall: 11 items, α = 0.63, variance = 56.6%; Factor #1 (F1): items = 3, α = 0.64; Factor #2 (F2): items = 3, α = 0.42; Factor #3 (F3): items = 3, α = 0.35; Factor #4 (F4): items = 2, α = 0.37). F1 and F4 were correlated with clinical experience (F1: P = 0.042; F4: P = 0.006) and participation in a gerodontology course (F1: P = 0.021; F4: P = 0.004). F1 was correlated with experience of dealing with the elderly (P = 0.031), while residence locality was correlated with F3 (P = 0.047) and F4 (P = 0.043). F2 was correlated with the presence of elderly in the family (P = 0.047). CONCLUSION The translated dental ageism questionnaire for Switzerland resulted in an 11-item scale with acceptable reliability.
Starting performance of synchronous motors with solid salient poles

The asynchronous performance of a synchronous motor, at a given slip, may be estimated from the 2-axis operational-admittance frequency functions Yd(jsω0), Yq(jsω0). The functions are commonly depicted as frequency-response loci. The frequency-response loci of a laminated-pole motor are shown to be analogous to the traditional induction-motor circle diagram. An accurate theoretical method is given to determine the asynchronous performance from the 2-axis loci, allowing for the effect of armature resistance. In addition, an approximate graphical method is given for the simplified condition when armature resistance is neglected.New equivalent circuits for the solid-pole motor are derived. The new circuits allow for the distribution of flux entering the rotor surface, and for the possibility of complete pole-tip saturation. Impedances, representing the parts of the magnetic circuit containing solid iron, are based on the rectangular magnetisation characteristic, and therefore have a magnitude, determined by the voltage across them, and a constant angle of 26.6°. The impedances are inserted into the equivalent circuits and the operational admittances are calculated by an iterative method. It is shown that the angle of the single effective ‘solid iron’ rotor impedance is found to lie between 26.6° and 45°, depending on the rotor frequency and flux. The method is also applicable to machines in which adjacent pole shoes are connected by end rings.Comparisons are shown between calculated and measured operational-admittance loci and between calculated and measured starting-performance characteristics for the solid-salient-pole micromachine at Imperial College, London, and for ten large solid-salient-pole machines of widely different dimensions and numbers of poles.A method of measuring, without attenuation, the component of oscillating starting torque of a synchronous motor, by measuring the total instantaneous input power, is demonstrated.
Role of Nitric Oxide and Protein S-Nitrosylation in Ischemia-Reperfusion Injury

Ischemia-reperfusion injury (IRI) is a process in which damage is induced in hypoxic tissue when oxygen supply is resumed after ischemia. During IRI, restoration of reduced nitric oxide (NO) levels may alleviate reperfusion injury in ischemic organs. The protective mechanism of NO is due to anti-inflammatory effects, antioxidant effects, and the regulation of cell signaling pathways. On the other hand, it is generally known that S-nitrosylation (SNO) mediates the detrimental or protective effect of NO depending on the action of the nitrosylated target protein, and this is also applied in the IRI process. In this review, the effect of each change of NO and SNO during the IRI process was investigated.
The occupancy preferences of transition metal elements and its effects on ductility and brittleness of γ/β phases in TiAl alloys: a first-principles investigation

ABSTRACT The occupancy tendency of M elements in γ/β-TiAl and the bonding strength, electronic structure, and tough-brittle transition of γ/β-TiAl-M were systematically investigated by first-principles calculations. According to the point defect anti-site-formation energy, charge density difference and electron localization function simulations, in the fourth and sixth cycles, M = Fe, Co, Os, Ir, Pt and Au (Ru in β-TiAl) elements preferentially occupy Al sites and lead to the formation of strong covalent-like directional bonds between themselves and surrounding Ti or Al elements. The electronic structure and chemical bonding features are analyzed. γ/β-TiAl-M compounds consist of covalent and metallic bonds, and M elements in the intermediate region give rise to strong covalent bonding features. In addition, transition metal elements that form metallic bonds with Ti or Al will contribute to the ductility of TiAl-based alloys. The diagram of B/G reflects this very well.
Estimation Methodology for Automotive Turbochargers Speed Fluctuations Due to Pulsating Flows

Turbocharging technique, together with engine downsizing, will play a fundamental role in the near future as a way to reach the required maximum performance while reducing engine displacement and, consequently, CO2 emissions.However, performing an optimal control of the turbocharging system is very difficult, especially for small engines fitted with a low number of cylinders. This is mainly due to the high turbocharger operating range and to the fact that the flow through compressor and turbine is highly unsteady, while only steady flow maps are usually provided by the manufacturer. In addition, in passenger cars applications, it is usually difficult to optimize turbocharger operating conditions because of the lack of information about pressure/temperature in turbine upstream/downstream circuits and turbocharger rotational speed.This work presents a methodology suitable for instantaneous turbocharger rotational speed determination through a proper processing of the signal coming from an accelerometer mounted on the compressor diffuser or a microphone faced to the compressor. The presented approach can be used to evaluate turbocharger speed mean value and turbocharger speed fluctuation (due to unsteady flow in turbine upstream and downstream circuits), that can be correlated to the power delivered by the turbine.The whole estimation algorithm has been developed and validated for a light duty turbocharged Common-Rail Diesel engine mounted in a test cell. Nevertheless, the developed methodology is general and can be applied to different turbochargers, both for Spark Ignited and Diesel applications.Copyright © 2014 by ASME
Optimization Aspects on the Hand of the Fabrics

Fabric hand is an essential property of textile fabrics. It affects the sensorial perception of humans when they touch a fabric. The feeling of hand depends on many factors; mainly on the low stress mechanical behavior of the fabric as well as on the subjective aspects of the person assessing the fabric such as sensitivity, culture, etc. The hand of the fabrics can be approached either by subjective estimations or by objective measurements. Both evaluation methods provide the necessary information for the calculation of the total hand value (THV) of the fabric. The THV is a function of multiple variables: the primary hand values. The complex expression of the THV introduces difficulties in predicting the conditions for the maximization of its final value. The present work provides a mathematical tool for a parametric study and definition of the quantities, which have to change, in order to maximize the THV of the fabric.
The first pilot demonstration: solar updraft tower power plant in Jordan

The high cost of importing heavy fuel oil from neighbouring countries of Jordan stimulated the need to consider renewable energy as an alternative to imported power. The paper describes a systematic experimental study on the pilot solar updraft tower power plant model system. Particular attention is given to measurements of air velocity, temperature, solar radiation and voltage difference. This is the first pilot solar updraft power plant that has been built in Jordan to evaluate such technology in Mutah Area. In this paper, all the experimental data were taken from a very small pilot project (compared with other prototypes that we constructed which were placed in the backyard of our faculty). For the experimental part, the solar updraft power plant was a pilot project with an updraft power plant height H=4(m), updraft power plant radius R c=0.29(m), plastic solar collector area A coll=36(m2), collector roof height=1(m), wind turbine that was a compensation of the suction fan with a diameter D fan=0.5(m), and a small generator (6 V) The experimental results in this paper show that the maximum height (H max) gradually increases with the solar irradiation (G). Also, in the same way, with the pressure difference (Δ p) increases with solar irradiation.
Prediction of Chemotoxicity, Unplanned Hospitalizations and Early Death in Older Patients with Colorectal Cancer Treated with Chemotherapy

Simple Summary Chemotoxicity, unplanned hospitalizations (Uhs) and early death (ED) are common among older patients with cancer who receive chemotherapy. Our objective was to determine factors predicting these complications. A predictive score for these three complications based on geriatric, tumor and laboratory variables was developed in a series of 215 older patients with colorectal carcinoma receiving chemotherapy. The use of this score may reliably identify patients at risk to have excessive toxicity with chemotherapy, UH or ED, thus helping to plan treatment, implement adaptive measures, and intensify follow-up. Abstract Purpose: To identify risk factors for toxicity, unplanned hospitalization (UH) and early death (ED) in older patients with colorectal carcinoma (CRC) initiating chemotherapy. Methods: 215 patients over 70 years were prospectively included. Geriatric assessment was performed before treatment, and tumor and treatment variables were collected. The association between these factors and grade 3–5 toxicity, UH and ED (<6 months) was examined by using multivariable logistic regression. Score points were assigned to each risk factor. Results: During the first 6 months of treatment, 33% of patients developed grade 3–5 toxicity, 31% had UH and 23% died. Risk factors were, for toxicity, instrumental activities of daily living, creatinine clearance, weight loss and MAX2 index; for UH, Charlson Comorbidity Score, creatinine clearance, weight loss, serum albumin, and metastatic disease; and for ED, basic activities in daily living, weight loss, metastatic disease, and hemoglobin levels. Predictive scores were built with these variables. The areas under receiver operation characteristic (ROC) curves for toxicity, UH and ED were 0.70 (95% CI: 0.64–0.766), 0.726 (95% IC: 0.661–0.799) and 0.74 (95% IC: 0.678–0.809), respectively. Conclusion: Simple scores based on geriatric, tumor and laboratory characteristics predict severe toxicity, UH and ED, and may help in treatment planning.
Student Teachers of Technology and Design: Can short periods of STEM-related industrial placement change student perceptions of engineering and technology?

This is a report, on a small-scale case study, of a programme of short industrial placements (5 day block) for student teachers of technology and design in Northern Ireland. Such placements increase student awareness and understanding of the nature of Engineering and Technology and therefore better prepare them to teach these subjects, as integral elements of STEM (Science, Technology, Engineering and Mathematics). The aim was to discover if a short period of industrial placement would change student perceptions of industry, engineering and technology. Prior to the placement, undertaken in collaboration with industrial partners, the students revealed preconceived ideas about engineering, technology and industry. During placement students had opportunities to ‘work-shadow’ engineers and technologists and to contest their predetermined views and opinions. This study reveals that previously held views were challenged in terms of definitions contested, roles and function considered, perceptions challenged, and awareness increased.
Electrophoresis-Aided Biomimetic Mineralization System Using Graphene Oxide for Regeneration of Hydroxyapatite on Dentin

Graphene oxide (GO) is an emerging luminescent carbon nanomaterial with the ability to foster hydroxyapatite (HA). A specially designed electrophoresis system can be used to accelerate the mineralization process. The aim of this study was to promote HA crystal growth on demineralized dentin using a GO incorporated electrophoresis system. GO was successfully synthesized by carbonization of citric acid and its presence was confirmed by Fourier transform infrared and UV-visible spectrophotometry evaluation. Dentin slices were placed in demineralized solution and divided into control (without the electrophoresis system) and experimental group. Demineralized dentin slices in the experimental group were remineralized using the electrophoresis system for 8 h/1.0 mA, with one subgroup treated without GO and the other with GO. Energy dispersive spectroscopy evaluation showed that the calcium/phosphate ratio of the crystal formed in control and experimental group with addition of GO was close to natural hydroxyapatite. However, scanning electron microscopy evaluation showed that the exposed dentinal tubules were occluded with rod-like crystals, which is similar to native enamel morphology, in the experimental group with addition of GO compared to the flake-like crystal in the control group. Mechanical evaluation revealed that the nanohardness and modulus of remineralized dentin were significantly higher in the experimental group. In conclusion, GO is a promising material to remineralize dentin and the introduction of an electrophoresis system can accelerate its process.
Inorganic Nanoparticles for either Charge Storage or Memristance Modulation

We present prototype memory devices using metallic and metal oxide nanoparticles obtained by a physical deposition technique. The two memory device examples demonstrated concern the use of platinum nanoparticles for flash-type memories and the use of titanium oxide nanoparticles for resistive memories. Both approaches give interesting device memory properties with resistive memories being still in an early exploratory phase.
Explorative Visual Analysis of Rap Music

Detecting references and similarities in music lyrics can be a difficult task. Crowdsourced knowledge platforms such as Genius. can help in this process through user-annotated information about the artist and the song but fail to include visualizations to help users find similarities and structures on a higher and more abstract level. We propose a prototype to compute similarities between rap artists based on word embedding of their lyrics crawled from Genius. Furthermore, the artists and their lyrics can be analyzed using an explorative visualization system applying multiple visualization methods to support domain-specific tasks.
E-Learning: A Study of Issues and Perspectives

This study examines some of the issues and perspectives associated with development and delivery of an undergraduate business degree incorporating elearning. The investigation was undertaken in an Australian University and incorporates the opinions and viewpoints of staff and students - both local and offshore. E-learning is a complex, and often poorly structured knowledge area, with many different issues, influences and agendas. For this reason Soft Systems Methodology (SSM) has been used to develop a model for analysis and for comparison of the issues with the literature.
An Exact Explicit Analytical Solution of the Steady-State Temperature in a Half Space Subjected to a Moving Circular Heat Source

So far in the literature, the distribution of stationary temperature over the surface of a half space subjected to a moving circular heat source has been reported in an integral or asymptotic form. In this paper an exact explicit analytical solution is provided, which allows the determination of the temperatures over the contact area with a very short computational time, regardless of the value of the Peclet number. The solution is based on special functions (Bessel and hypergeometric functions) that are preprogrammed under a formal calculation software (e.g., Maple). The results of the proposed solution are in agreement with the asymptotic models available in the literature.
MAPPING KNOWLEDGE MANAGEMENT RESEARCH: A BIBLIOMETRIC OVERVIEW

In recent years, knowledge management (KM) has consistently attained considerably growing research attention. Consequently, several literature reviews have been performed addressing different topic areas of KM. This paper seeks to present a comprehensive bibliometric and network analysis on KM to understand its development from the perspective of academic communities. Subsequently, it seeks to identify the structure of associations between prior and current themes, predict emerging trends and offer a longitudinal perspective on KM research. This study used web of science database and the initial sample was trimmed down by considering only the articles contributing to KM literature, and further 8,721 KM papers published in the last 30 years were systematically evaluated. The descriptive statistics and science mapping methods employing co-citation analysis were performed with VOSviewer software. In the descriptive analysis, we have analysed publication trends over time, geographical localization of the contributing institutions, journals, most prolific authors, top-performing institutions and most cited articles. Science mapping analysis is based on co-word analysis and co-citations analysis, namely articles’ co-citations and authors’ co-citations. The main findings of this paper will help researchers and academicians to develop knowledge in a specific sub-field by analysing the research outcomes of the papers included in the body of literature.