Miracle-dz/UniFAR-FTUs huggingface dataset:
Acquisition, retention and transfer of heavy equipment operator skills through simulator training

So, Chung Yin. Ph.D., Purdue University, December 2014. Acquisition, Retention and Transfer of Heavy Equipment Operator Skills Through Simulator Training. Major Professors: Robert W. Proctor, Phillip S. Dunston, and Vincent Duffy. Initiatives and collaborations among heavy construction equipment manufacturing companies and training technology firms to develop and employ simulators for varied training purposes are becoming commonplace. However, human factors research on simulator training for operators of construction equipment is still sparse. For simulator training to be effective, it is necessary to understand how skills are learned using the simulator, how those skills are transferred to other tasks, devices, and real scenarios, and how well skills are retained after simulator training. This research is on skill development, specifically as it applies to operator training for two specific types of heavy construction equipment: excavator and wheel loader. It aims at decomposing the complexity of equipment operation and distinguishing the skills to be acquired for each machine. It consists of five studies, three conducted with students at Purdue and two with expert operators at John Deere. Study 1 investigated whether operation of a simulated hydraulic excavator is influenced by an intervening task performed between initial practice on the excavator and a subsequent retention test using a controls familiarization task (which involves just knowing the control functions). Two intervening tasks were inserted: practicing on
Knowledge-based fault monitoring and diagnosis in Space Shuttle propellant loading

The LOX Expert System (LES), now being developed as a tool for the constraint-based monitoring and analysis of propellant loading at the Kennedy Space Center (KSC), is discussed. The loading of LOX at the KSC and its control and monitoring by the Launch Processing System are summarized, and the relevant problem for LES is presented. The LES database is briefly described, and the interaction of LES with KNOBS, a constraint- and frame-oriented knowledge-based system developed as a demonstration system in aid of tactical air mission planning, is the context of launch processing is discussed in detail. The design and fault isolation techniques of LES are also discussed.
Propellant Gauging for Exploration

This paper presents a brief overview of propellant gauging needs and requirements in the context of lunar exploration missions defined by the Exploration Systems Architecture Study (ESAS) report. A timeline for the development and testing of gauging technologies, and a few key design review dates are presented. A lunar exploration mission scenario is discussed which aids in defining the propellant gauging needs. The fleet of new exploration vehicles includes the Ares I and Ares V launch vehicles, Earth Departure Stage (EDS), Lunar Surface Access Module (LSAM) ascent and descent stages, and the Orion Crew Exploration Vehicle (CEV). The liquid propellant choices are currently oxygen - hydrogen for the launch vehicles, the EDS, and LSAM descent module; oxygen - methane for LSAM ascent module; and monomethylhydrazine nitrogen tetroxide (MMH-NTO) for the CEV. Estimated tank sizes, temperatures, pressures, and storage durations are presented. A baseline propellant gauging system is proposed that is based on high Technology Readiness Level (TRL) gauging technologies. In order to be considered for use on the new exploration vehicles, any new gauging technologies will have to show a clear benefit over the baseline methods in terms of performance and/or cost.
Impact of Improved Technology Package Adoption on Maize Yield Growth in Ethiopia: Conditional Differences in Differences Approach Application

This study examines the impact of adoption of improved maize technology package (including improved maize varieties, fertilizer of any kind as well as row planting) on maize yield growth of Ethiopia at national level. In so doing, a balanced panel data set covering two time periods was used and propensity score matching in combination with a difference-in-differences estimator was employed to better match control and project units on preprogram observable characteristics and to control for certain types of unobserved variables which can be assumed to remain fixed over a shorter time series. It is found that that adoption of improved maize technology package had positive and significant impact on maize yield growth of Ethiopia at national level. Therefore, this study recommends to widely scale-up the efficient use of improved maize varieties in combination with other complementary inputs and agronomic practices to all maize producing farm households which obviously calls for embracing the enormous diversity of the production systems as well as a well-coordinated, effective as well as efficient effort of all of the relevant stakeholders of the agricultural sector of the country including farmers supported with a major recommitment to effective overall management of so many facets of the economic environment.
A study of boosting molecular descriptors with quantum-derived features in prediction of maximum emission wavelengths of chromophores.

The following research assesses the capability of machine learning in predicting maximum emission wavelengths of organic compounds. The predictions are based on molecular descriptors and fingerprints widely applied in cheminformatics. In an effort to further improve accuracy, developed machine learning models were enriched with quantum mechanics derived features. Multi linear, gradient boosting and random forest regressions were applied. Computers were trained and tested with database of experimental data of optical properties.
Acoustic Treatment Design Scaling Methods. Volume 2; Advanced Treatment Impedance Models for High Frequency Ranges

The primary purpose of the study presented in this volume of the Task Order 25 Final Report is to develop improved models for the acoustic impedance of treatment panels at high frequencies, for application to sub-scale treatment designs. Effects that cause significant deviation of the impedance from simple geometric scaling are examined in detail, an improved high frequency impedance model is developed, and the improved model is correlated with high frequency impedance measurements. Only single-degree-of-freedom honeycomb sandwich resonator panels with either perforated sheet or "linear" wiremesh faceplates are considered here. The objective is to understand those effects that cause the simple single-degree-of-freedom resonator panels to deviate at the higher scaled frequency from the impedance that would be obtained at the corresponding full scale frequency. This will allow the sub-scale panel to be designed to achieve a specified impedance spectrum over at least a limited range of frequencies. As long as the impedance achieved in the scale model is known with a sufficient degree of accuracy, it can be reliably translated to the full scale design. An advanced impedance prediction model has been developed that accounts for some of the known effects at high frequency that have previously been ignored as a small source of error for full scale frequency ranges. The model has been implemented in a computer program and used to compare with predicted data from the currently-used impedance model and with measured data for a number of treatment configurations of various scale. Based on this study, the outlook on ability to use scaled perforate facesheet single-degree-of-freedom resonator liners to represent full scale is encouraging. Care must be taken to make the proper adjustments in porosity and cavity depth of the scaled liner to best fit the full scale impedance.
Arithmetic Formulated Relevantly

The purpose of this paper is to formulate first-order Peano arithmetic within the resources of relevant logic, and to demonstrate certain properties of the system thus formulated. Striking among these properties are the facts that (1) it is trivial that relevant arithmetic is absolutely consistent, but (2) classical first-order Peano arithmetic is straightforwardly contained in relevant arithmetic. Under (1), I shall show in particular that 0 = 1 is a non-theorem of relevant arithmetic; this, of course, is exactly the formula whose unprovability was sought in the Hilbert program for proving arithmetic consistent. Under (2), I shall exhibit the requisite translation, drawing some Goedelian conclusions therefrom. Left open, however, is the critical problem whether Ackermann’s rule γ is admissible for theories of relevant arithmetic. The particular system of relevant Peano arithmetic featured in this paper shall be called R♯. Its logical base shall be the system R of relevant implication, taken in its first-order form RQ. Among other Peano arithmetics we shall consider here in particular the systems C♯, J♯, and RM3♯; these are based respectively on the classical logic C, the intuitionistic logic J, and the Sobocinski-Dunn semi-relevant logic RM3. And another feature of the paper will be the presentation of a system of natural deduction for R♯, along lines valid for first-order relevant theories in general. This formulation of R♯ makes it possible to construct relevantly valid arithmetical deductions in an easy and natural way; it is based on, but is in some respects more convenient than, the natural deduction formulations for relevant logics developed by Anderson and Belnap in Entailment.
WZDèU ŻNE POLE MAGNETYCZNE W SZCZELINIE POPRZECZNEGO èO ŻYSKA ŚLIZGOWEGO

W pracy autorzy przedstawiają analityczno-numeryczn ą metod e wyznaczania skoadowych wektora natez enia pola magnetycznego w szczelinie walcowego oo zyska ślizgowego. Zagadnienie to staje sie istotne, gdy jako czynnik smarowy w oo zysku ślizgowym zostanie zastosowana ferrociecz, na ktor ą dziaoa zewn etrzne pole magnetyczne.
Transparentne warstwy drukowane PEDOT jako kontakty emiterowe do aplikacji w elastycznych ogniwach fotowoltaicznych

In this paper authors show the alternative, potential possibility of using PEDOT conductive polymer as transparent emitter contacts for thin-film, flexible photovoltaic (PV) structures. Transparent conductive layers (TCL) based on PEDOT:PSS compound were deposited on flexible substrates by screen printing technique. The analysis of achieved results shows the broad spectrum of application possibilities for PEDOT layers. (Transparent printed PEDOT layers as emitter contacts in flexible photovoltaic cells applications).
Long-Term Longitudinal Patterns of Patient-Reported Fatigue After Breast Cancer: A Group-Based Trajectory Analysis

PURPOSE Fatigue is recognized as one of the most burdensome and long-lasting adverse effects of cancer and cancer treatment. We aimed to characterize long-term fatigue trajectories among breast cancer survivors. METHODS We performed a detailed longitudinal analysis of fatigue using a large ongoing national prospective clinical study (CANcer TOxicity, ClinicalTrials.gov identifier: NCT01993498) of patients with stage I-III breast cancer treated from 2012 to 2015. Fatigue was assessed at diagnosis and year 1, 2, and 4 postdiagnosis. Baseline clinical, sociodemographic, behavioral, tumor-related, and treatment-related characteristics were available. Trajectories of fatigue and risk factors of trajectory-group membership were identified by iterative estimates of group-based trajectory models. RESULTS Three trajectory groups were identified for severe global fatigue (n = 4,173). Twenty-one percent of patients were in the high-risk group, having risk estimates of severe global fatigue of 94.8% (95% CI, 86.6 to 100.0) at diagnosis and 64.6% (95% CI, 59.2 to 70.1) at year 4; 19% of patients clustered in the deteriorating group with risk estimates of severe global fatigue of 13.8% (95% CI, 6.7 to 20.9) at diagnosis and 64.5% (95% CI, 57.3 to 71.8) at year 4; 60% were in the low-risk group with risk estimates of 3.6% (95% CI, 2.5 to 4.7) at diagnosis and 9.6% (95% CI, 7.5 to 11.7) at year 4. The distinct dimensions of fatigue clustered in different trajectory groups than those identified by severe global fatigue, being differentially affected by sociodemographic, clinical, and treatment-related factors. CONCLUSION Our findings highlight the multidimensional nature of cancer-related fatigue and the complexity of its risk factors. This study helps to identify patients with increased risk of severe fatigue and to inform personalized interventions to ameliorate this problem.
Ultrasound assessment of central venous pressure: A systematic review and meta-analysis

Background Ultrasound is increasingly relied upon to estimate central venous pressure (CVP) in the echocardiography lab and using point-of-care systems in the intensive care unit and the emergency department. However, there is uncertainty regarding the diagnostic accuracy of ultrasound-based parameters as reported in diverse studies.Methods A systematic review was performed by searching MEDLINE, EMBASE, and the Cochrane Database for studies evaluating ultrasound-based indicators of filling pressures in relation to catheterization-based CVP. Studies were screened for predefined inclusion criteria and rated for quality by duplicate observers. Standardized correlation coefficients for each ultrasound-based indicator were meta-analyzed using a random effects model.Results 3949 articles were screened and 64 met the criteria for inclusion. Inferior vena cava (IVC) diameter was assessed in 34 study measures and the pooled standardized correlation with invasive CVP was 0.74 (95% CI 0.63 to 0.84). IVC collapsibility was assessed in 20 study measures and the pooled standardized correlation with invasive CVP was -0.57 (95% CI -0.70 to -0.44). Tricuspid E/Ep was assessed in 6 study measures and the pooled standardized correlation with invasive CVP was 0.59 (95% CI 0.26 to 0.93). IVC parameters but not E/Ep remained correlated with CVP in mechanically ventilated patients, including cardiac surgery patients. Results were similar in studies featuring non-traditional users and cardiac specialists.Conclusions Echocardiographic IVC diameter, collapsibility, and tricuspid E/Ep ratio are significantly correlated with invasive CVP, albeit with important heterogeneity between studies. Most of these indicators are equally valid when applied in ventilated patients and by non-traditional users.
Transformations in Air Transportation Systems For the 21st Century

Globally, our transportation systems face increasingly discomforting realities: certain of the legacy air and ground infrastructures of the 20th century will not satisfy our 21st century mobility needs. The consequence of inaction is diminished quality of life and economic opportunity for those nations unable to transform from the 20th to 21st century systems. Clearly, new thinking is required regarding business models that cater to consumers value of time, airspace architectures that enable those new business models, and technology strategies for innovating at the system-of-networks level. This lecture proposes a structured way of thinking about transformation from the legacy systems of the 20th century toward new systems for the 21st century. The comparison and contrast between the legacy systems of the 20th century and the transformed systems of the 21st century provides insights into the structure of transformation of air transportation. Where the legacy systems tend to be analog (versus digital), centralized (versus distributed), and scheduled (versus on-demand) for example, transformed 21st century systems become capable of scalability through technological, business, and policy innovations. Where air mobility in our legacy systems of the 20th century brought economic opportunity and quality of life to large service markets, transformed air mobility of the 21st century becomes more equitable available to ever-thinner and widely distributed populations. Several technological developments in the traditional aircraft disciplines as well as in communication, navigation, surveillance and information systems create new foundations for 21st thinking about air transportation. One of the technological developments of importance arises from complexity science and modern network theory. Scale-free (i.e., scalable) networks represent a promising concept space for modeling airspace system architectures, and for assessing network performance in terms of robustness, resilience, and other metrics. The lecture offers an air transportation system topology and a scale-free network linkage graphic as framework for transportation system innovation. Successful outcomes of innovation in air transportation could lay the foundations for new paradigms for aircraft and their operating capabilities, air transportation system topologies, and airspace architectures and procedural concepts. These new paradigms could support scalable alternatives for the expansion of future air mobility to more consumers in more parts of the world.
Prediction of Useful Life by Heat Aging of Motor Fan Isolating Rubber

This paper discusses the accelerated heat aging tests were carried out to predict the useful life of EPDM isolating rubber components of ventilation fan motor for clean room. 20% compression set results changes as the threshold are used for assessment of the useful life and the time to threshold value were plotted against reciprocal of absolute temperature to give the Arrhenius plot. The useful life at variable temperatures and activation energy are obtained from the Arrhenius relationship. An accelerated test program to assess useful life can be represented an appreciable investment in time was designed. We also considered the effect of antioxidant agents.
HELP WANTED--MEETING THE NEED FOR TOMORROW'S TRANSPORTATION WORK FORCE

This article looks at the anticipated shortage in the U.S. of qualified transportation industry workers in the coming years as a result of the "baby boomer" generation beginning to retire and the concurrent growth of the combined transportation system. Various efforts by the Federal Highway Administration to address this problem by attracting and training new transportation construction and maintenance workers are discussed. Provisions of the Transportation Equity Act for the 21st Century and of the National Executive Potential Program aimed at transportation workforce development are also described.
Mechanism Linking AR-Based Presentation Mode and Consumers' Responses: A Moderated Serial Mediation Model

The technological development of online product presentation modes (e.g., augmented reality, virtual reality) will greatly impact the future of e-retailing. The potential benefits of applying these new technologies for e-retailers need further investigation. Based upon the stimulus-organism-response (S–O-R) model, this study examines the effect of AR-based presentation modes on consumer patronage intention, with the mediating role of immersion, enjoyment, perceived product risk and attractiveness of the online store. Furthermore, it explores the moderating effect of technophilia that reflects consumers’ positive attitude towards technology. A single factor between-subject experiment study was conducted with a sample of 420 university students. Results suggest that the serial indirect effects of AR presentation on patronage intention through immersion/enjoyment/perceived product risk and attractiveness of online store are conditional upon the level of technophilia. Technophilia is a critical factor that explains consumers’ psychological and behavioral responses when they are using new technologies. The study provides new knowledge for e-marketing practitioners, as well as AR literature by indicating how and when new technology-based presentation works in evoking consumers’ patronage intention.
Impact of cool roof on energy consumption for a railway station

The roof reflectance surface and skylight shade reflectance are two significant factors affecting air-conditioning energy consumption and indoor lighting in a single-storey large volume building, such as a railway station. Based on qualitative analysis on the effect of cool roof on building performance, a model of a large tall railway station built in the software EnergyPlus was verified by field data. The model was applied to analyse the effect of cool roof reflectance and skylight shade reflectance on the installed capacity of air-conditioning system, lighting energy consumption and indoor thermal comfort under different climates. The results show that the high reflectance surface of opaque cool roof is beneficial by reducing the energy consumption for indoor cooling and the installed capacity of air-conditioning system and improve the indoor thermal comfort in summertime. However, the opposite is true in wintertime, and this could consequently lead to more annual energy consumption. The high reflectance of skylights could reduce the energy consumption for cooling in summer and limit the energy consumption for heating and lighting in winter, thus reducing the annual energy consumption by a large amount. This study indicates that the local climates and the inherent characteristics of roof structure should be considered in the practical use of cool roof technology.
Design and Control of an Innovative Micro-Rover

During recent years the European Space Agency (ESA) has started to develop concepts for micro-rovers for planetary missions. An ESA Technology Research Program (TRP) activity "Micro-Robots for Scientific Applications" has been dedicated to this subject. Within an interdisciplinary group of space companies and research labs new designs of micro-rovers have been investigated. Two concepts, a simple and robust one and an innovative one, have been selected and functional breadboard models of them are currently built. After a discussion of the key issues for robust locomotion the present paper will focus on the design, implementation and control of SpaceCat, the more innovative solution selected as breadboard model B whereas the complementary work on breadboard model A is described in detail in [1]. It consists of 6 independently driven wheels arranged in two triangles. It therefore allows not only for efficient rolling on flat surfaces but also to step on obstacles. Additionally the center of mass and the instrumentation carrousel is adjustable, allowing to optimally balance the micro-rover in almost every situation. Even after flipping over the robot will always be able to get back on its wheels. To navigate the rover autonomously within a range of about 10 to 20 meters from the lander, an active vision system is used with a camera on the lander. It allows to control the robot through a very user-friendly interface. Local piloting and obstacle avoidance is based on various on board sensors. This enables robust and collision free operation even in rough terrain. ESA defined the following main requirements and constraints: o Stowed dimensions envelope (cm): 30 x 20 x 20 o Net mass of the robot system:max. 2 kg o Mass of the scientific payload:2 kg o Electrical power provided by lander:max. 2 Watt average, max. 3 Watt peak o Possibility to position the on board sensors: accuracy around 1 mm o Maximum speed: 5 m/h The rover must overcome obstacles of 0.1 m height and holes of 0.1 m width. It has to be able to climb slopes of 15° upwards and 20° downwards. Simple maneuvers like turning and moving backward is required too. Moreover, to ensure mission success the following requirements have been identified: o No risk of sinkage and getting stuck in the sand o Flip-over stability o Recovery after flip-over and after having been buried by a sand storm